Cord base paper automatic feeder, single facer, and cord base paper automatic feeder method

Abstract

To feed a core base paper from a tip to a direction facing two corrugating rolls without manual work by an operator.SOLUTION: An automatic core base paper feeding device comprises: a base paper holding member displaceable between a holding position that holds a core base paper PA1 and a release position; a conveying force applying member operable to apply a conveying force to the core base paper; and control means for controlling driving means for driving the base paper holding member and the conveying force applying member. The control means executes: a first control process that controls the driving means so as to displace the base paper holding member from the holding position to the release position when a single facer starts a corrugating operation to form the core base paper into a corrugating shape, and so as to displace the base paper holding member from the release position to the holding position when the single facer stops the corrugating operation; and a second control process that controls the driving means so that the conveying force applying member applies a conveying force to the core base paper in a state where the base paper holding member is displaced from the holding position to the releasing position and then positioned at the releasing position.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to an automatic corrugation paper feeder that automatically feeds corrugation paper to a meshing portion between an upper roll and a lower roll in a single facer. [Background technology]

[0002] A single facer is a machine that processes corrugated paper into a corrugated shape and bonds it to a liner paper to produce a single-faced corrugated board sheet. In order for the corrugated paper to be formed into a corrugated shape by the meshing portion between the upper and lower corrugation rolls of the single facer, the leading edge of the corrugated paper needs to be fed into the meshing portion between both corrugation rolls.

[0003] The leading edge of the corrugation paper is fed to the meshing portion of both corrugation rolls in the first case, where the corrugation paper is fed when the production of single-faced corrugated cardboard sheets for the day starts, and the second case, where the corrugation paper is fed after the corrugation rolls are replaced. In the first case, when the production of single-faced corrugated cardboard sheets for the previous day ends, the corrugation paper fed to both corrugation rolls is cut into a leading edge of the corrugation paper on the upstream side and a trailing edge of the corrugation paper on the downstream side in the feeding direction, either manually by an operator or automatically by a cutting machine. Next, the leading edge of the corrugation paper on the upstream side and the trailing edge of the corrugation paper on the downstream side that have been cut are taken out of the single facer. When the production of single-faced corrugated cardboard sheets for the next day starts, the leading edge of the corrugation paper taken out the previous day is fed toward the meshing portion of both corrugation rolls. In the second case, before the corrugation rolls are replaced, the corrugation paper fed to both corrugation rolls is cut manually by an operator or automatically by a cutting machine into a leading end portion of the corrugation paper on the upstream side and a trailing end portion of the corrugation paper on the downstream side in the paper feed direction. Next, the leading end portion of the corrugation paper on the upstream side and the trailing end portion of the corrugation paper on the downstream side that have been cut are taken out of the single facer. After the corrugation rolls are replaced, the leading end portion of the corrugation paper that has been taken out is fed toward the meshing portion of the two corrugation rolls that have been newly installed on the single facer by the replacement of the corrugation rolls. In the first and second cases, corrugation paper feeding devices described in Patent Documents 1 and 2 have been proposed as examples of devices that feed the corrugation paper to the meshing portion of the two corrugation rolls.

[0004] The core raw paper feeding device described in Patent Document 1 includes a roll cylinder and a guide roll that can be moved toward and away from each other. The roll cylinder and the guide roll are disposed between a preheater and both stage rolls. The roll cylinder is driven to rotate by a drive motor. When the roll cylinder and the guide roll are in a pressed contact state and the roll cylinder is driven by the drive motor, an operator inserts the leading end of the core raw paper into the pressed contact portion between the guide roll and the roll cylinder, whereby the leading end of the core raw paper is fed toward both stage rolls.

[0005] The core raw paper feeding device described in Patent Document 2 is equipped with a lower air blowing nozzle and an upper air blowing nozzle below and above the paper running path of the core raw paper. Both air blowing nozzles are arranged to create a space between the upstream moistener and the meshing part of the two stage rolls. When the blower is operated, air is blown out from the outlet of each air blowing nozzle in the transport direction of the core raw paper, and the leading edge of the core raw paper rides on the generated air flow, so that the leading edge of the core raw paper is fed toward the two stage rolls. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Publication No. 3-15298 [Patent Document 2] Jpn. Jpn. Published No. 58-28831 Summary of the Invention [Problem to be solved by the invention]

[0007] However, in the device described in Patent Document 1, the operator needs to perform two manual tasks to handle the core raw paper. The two manual tasks are to insert the leading end of the core raw paper into an inlet between the preheater and the conveying guide via the guide roll and to pull it out from the outlet, and to insert the leading end of the core raw paper pulled out from the outlet between the preheater and the conveying guide into the pressure contact part between the guide roll and the roll cylinder. Similarly, in the device described in Patent Document 2, the operator needs to perform two manual tasks to handle the core raw paper. The two manual tasks are to pass the leading end of the core raw paper under the guide roll, and then to place the leading end of the core raw paper on the upper surface of the moistener so as to wrap the core raw paper around the moistener, and to push the core raw paper up to the entrance of the space formed by the air blowing nozzles at the position where the guide roll is arranged.

[0008] Therefore, the present invention aims to provide an automatic core raw paper feeding device that can feed the leading edge of the cut core raw paper toward both corrugated rolls when the single facer stops the corrugation operation of forming the core raw paper into a corrugated shape and the core raw paper that has been fed to both corrugated rolls of the single facer is cut by a corrugated paper holding member, without the manual operation of an operator handling the cut core raw paper when the single facer starts the corrugation operation. [Means for solving the problem]

[0009] The first aspect of the invention described in claim 1 is a single facer comprising an upper roll and a lower roll that mesh with each other to form the core raw paper into a corrugated shape, a rotatable preheater roll for heating the core raw paper, and a conveying path formed so that the core raw paper is conveyed in a predetermined conveying direction via the outer peripheral surface of the preheater roll to an engagement position between the upper roll and the lower roll, the single facer comprising: a paper holding member that is arranged on the conveying path between an outlet position on the conveying path where the core raw paper is conveyed in the predetermined conveying direction away from the outer peripheral surface of the preheater roll toward the engagement position and the engagement position, and that is displaceable to either a holding position that holds the core raw paper in the conveying path in the predetermined conveying direction or a release position that releases the hold; a first driving means for displacing the paper holding member; a conveying force imparting member that is operable to impart a conveying force to the core raw paper toward the engagement position; a second driving means for operating the conveying force imparting member; and a control means for controlling the first driving means and the second driving means. In a first aspect of the invention, the control means executes a first control process for controlling the first driving means so that the stencil paper holding member displaces from the holding position to the release position when the single facer starts a corrugated forming operation for forming the core raw paper into a corrugated shape, and so that the stencil paper holding member displaces from the release position to the holding position when the single facer stops the corrugated forming operation; and a second control process for controlling the second driving means so that the conveying force imparting member imparts a conveying force to the core raw paper in order to convey the core raw paper to the meshing position when the stencil paper holding member is in the release position after being displaced from the holding position. The first control process controls the first driving means so that, when the single facer stops the corrugation forming operation, the corrugation paper holding member is displaced from a release position to a holding position to hold the upstream corrugation paper portion of the corrugation paper present on the conveying path to the meshing position via the outer circumferential surface of the preheater roll, between the upstream corrugation paper portion and the downstream corrugation paper portion to be cut in the predetermined conveying direction, and controls the first driving means so that the corrugation paper holding member is maintained in the holding position until the single facer starts the corrugation forming operation. .

[0010] In this aspect of the present invention, the transport force imparting member may be configured to be disposed upstream of the stencil paper holding member in the predetermined transport direction, or may be configured to be disposed downstream of the stencil paper holding member.

[0011] In this aspect of the present invention, the conveying force imparting member may be configured to generate a conveying force by itself, or may be configured to operate to transmit a moving force generated by another member, such as a preheater roll, to the core raw paper as a conveying force.

[0012] In this aspect of the present invention, the transport path is provided between the meshing position of the two stage rolls and the discharge position where the core raw paper is discharged in a predetermined transport direction away from the outer circumferential surface of the preheater roll. This transport path may be formed in a straight shape or a curved shape as long as it can guide the core raw paper to which a transport force is applied from the discharge position to the meshing position.

[0013] In this aspect of the present invention, the time when the single facer starts the corrugation forming operation of forming the corrugated core raw paper into a corrugated shape may be the time when the operator operates an operation start operating means such as an operation button, or it may be the time when the control means of the single facer or the like issues an operation start command to start a specified order. Also, the time when the single facer stops its corrugation forming operation may be the time when the operator operates a stop operating means such as a stop button, or it may be the time when the specified order is completed and the control means of the single facer or the like issues a stop command.

[0014] Generally, when the single facer stops the corrugation operation, the core raw paper that has been fed to both corrugation rolls is cut at a position upstream of both corrugation rolls in a predetermined conveying direction. After that, the cut core raw paper is taken out from the meshing portion of both corrugation rolls. In this aspect of the present invention, the core raw paper that has been fed to both corrugation rolls may be cut manually by an operator at a position downstream of the corrugation paper holding member in a predetermined conveying direction, or may be cut automatically by a cutting machine. In addition, this aspect of the present invention may be configured to include a cutting machine that cuts the core raw paper or cutting parts used for cutting, or may be configured to include no cutting machine or cutting parts at all. Furthermore, in this aspect of the present invention, as long as the cut core raw paper does not move significantly in a direction in which it falls from the outer circumferential surface of the preheater roll due to its own weight, the point at which the core paper holding member starts holding the core raw paper may be a point after the core raw paper is cut, or a point before the core raw paper is cut.

[0015] In this aspect of the present invention, the single facer may start the corrugation operation of forming the core raw paper into a corrugated shape after one of the two corrugation rolls has been replaced, or the corrugation operation may be started for the first time the next day after production of single-faced cardboard sheets has ended for the day.

[0016] In this aspect of the present invention, as long as there exists a state in which the conveying force imparting member can actually impart a conveying force to the core raw paper in order to convey the core raw paper to the meshing position when the stencil paper holding member is in the release position after being displaced from the holding position, the relationship between the time when the operation of displacing the stencil paper holding member from the holding position to the release position starts and the time when the operation of imparting a conveying force to the core raw paper by the conveying force imparting member starts is not particularly limited. For example, the second control process may be configured to control the second driving means to start an operation that enables the conveying force imparting member to impart a conveying force to the core raw paper, or to start an operation of the conveying force imparting member actually imparting a conveying force to the core raw paper, at a time before the time when the stencil paper holding member is in the release position, i.e., when the stencil paper holding member is in the holding position. Alternatively, if the core raw paper does not move significantly in the direction of falling from the outer peripheral surface of the preheater roll due to its own weight at the time when the operation of the conveying force imparting member to impart a conveying force to the core raw paper is started, the second control process may be configured to control the second driving means so that the conveying force imparting member starts the operation of actually imparting a conveying force to the core raw paper at a time after the time when the operation of the raw paper holding member to displace from the holding position to the release position is started, i.e., when the raw paper holding member is located in the release position.

[0017] In this aspect of the present invention, as long as the transport force imparting member is able to impart to the core raw paper a transport force for transporting the core raw paper, which has been released from the paper holding member, to the engagement position at the start of the step formation operation, the configuration may also be such that the member performs an operation of imparting a transport force to the core raw paper in order to adjust the tension applied to the core raw paper at a time other than the start of the step formation operation, for example while the step formation operation is being performed.

[0018] In a specific embodiment described in claim 2, the single facer is provided with a cutting member arranged on the conveying path to cut the core raw paper present between the discharge position and the engagement position on the conveying path, and the raw paper holding member is arranged at a position upstream of the cutting member in the predetermined conveying direction.

[0019] In this specific embodiment, the cutting member is not particularly limited as long as it is a member that contributes to cutting the core raw paper, and may be, for example, a cutting blade of a cutting machine having a cutting function, or a cutting guide member that guides the cutting edge of a cutter held by an operator.

[0020] In a specific embodiment described in claim 3, the single facer is equipped with a steam delivery device having a steam delivery area for delivering steam toward the core raw paper located between the discharge position and the engagement position on the conveying path, the steam delivery area being arranged along the conveying path, and the raw paper holding member is arranged at a position upstream of the upstream end of the steam delivery area of ​​the steam delivery device in a predetermined conveying direction.

[0021] The method according to claim 4 Second aspect of the invention teeth, The single facer comprises an upper roll and a lower roll that mesh with each other to form the core raw paper into a stepped shape, a rotatable preheater roll that heats the core raw paper, and a transport path formed so that the core raw paper is transported in a predetermined transport direction via the outer peripheral surface of the preheater roll to an engagement position between the upper roll and the lower roll.The single facer comprises a paper holding member that is disposed on the transport path between an outlet position on the transport path where the core raw paper is transported in the predetermined transport direction away from the outer peripheral surface of the preheater roll toward the engagement position and the engagement position, and is displaceable to either a holding position that holds the core raw paper in the transport path in the predetermined transport direction or a release position that releases the hold, a first driving means that displaces the paper holding member, a transport force imparting member that is operable to apply a transport force to the core raw paper toward the engagement position, a second driving means that operates the transport force imparting member, and a control means that controls the first driving means and the second driving means. In a second aspect of the invention, the control means executes a first control process for controlling the first driving means so that the stencil paper holding member displaces from the holding position to the release position when the single facer starts a corrugation forming operation for forming the core raw paper into a corrugated shape, and so that the stencil paper holding member displaces from the release position to the holding position when the single facer stops its corrugation forming operation; and a second control process for controlling the second driving means so that the conveying force imparting member imparts a conveying force to the core raw paper in order to convey the core raw paper to the meshing position when the stencil paper holding member is in the release position after being displaced from the holding position, The conveying force imparting member operates to contact a central portion of the core raw paper in the paper width direction perpendicular to the predetermined conveying direction in order to impart a conveying force to the core raw paper, and the paper holding member includes a plate-shaped member arranged so as to be able to move toward and away from the conveying surface of the conveying path, and the plate-shaped member has a pressing surface that contacts the central portion of the core raw paper in order to press and hold the core raw paper, and the dimension of the pressing surface in the paper width direction is set to be smaller than the dimension in the direction of the rotation axis of the preheater roll.

[0022] Books invention In this embodiment, the plate-like member may be one plate-like member or multiple plate-like members, as long as it has a pressing surface that presses the central portion of the core raw paper in the paper width direction. In addition, it is preferable that the pressing surface of the plate-like member has a material or shape that has a large friction resistance.

[0023] In a specific embodiment described in claim 5, the first driving means includes a lifting drive unit for raising and lowering the plate-shaped member relative to the conveying surface, and an actuating member that moves relative to the lifting drive unit when the lifting drive unit is driven and is connected to the plate-shaped member, and the plate-shaped member is configured to have a weight that is smaller than the movement resistance force that constantly acts on the actuating member when the actuating member moves relative to the lifting drive unit.

[0024] In this specific aspect, the movement resistance force constantly acting on the operating member is a force that prevents the operating member from moving relative to the lifting drive unit when the lifting drive unit is not driven, and includes a sliding resistance force acting between the lifting drive unit and the operating member, etc.

[0025] In a specific embodiment described in claim 6, the transport force imparting member is disposed at a position upstream of the position where the stencil paper holding member is disposed in the predetermined transport direction.

[0026] In this specific embodiment, so long as the transport force imparting member is positioned upstream of the position where the base paper holding member is positioned, it may also be positioned downstream of the discharge position on the transport path where the core base paper leaves the outer peripheral surface of the preheater roll and is transported in a predetermined transport direction toward the meshing position.

[0027] The method according to claim 7 Third aspect of the invention teeth, The single facer comprises an upper roll and a lower roll that mesh with each other to form the core raw paper into a stepped shape, a rotatable preheater roll that heats the core raw paper, and a transport path formed so that the core raw paper is transported in a predetermined transport direction via the outer peripheral surface of the preheater roll to an engagement position between the upper roll and the lower roll.The single facer comprises a paper holding member that is disposed on the transport path between an outlet position on the transport path where the core raw paper is transported in the predetermined transport direction away from the outer peripheral surface of the preheater roll toward the engagement position and the engagement position, and is displaceable to either a holding position that holds the core raw paper in the transport path in the predetermined transport direction or a release position that releases the hold, a first driving means that displaces the paper holding member, a transport force imparting member that is operable to apply a transport force to the core raw paper toward the engagement position, a second driving means that operates the transport force imparting member, and a control means that controls the first driving means and the second driving means. In a third aspect of the invention, the control means executes a first control process for controlling the first driving means so that the stencil paper holding member displaces from the holding position to the release position when the single facer starts a corrugation forming operation for forming the core raw paper into a corrugated shape, and so that the stencil paper holding member displaces from the release position to the holding position when the single facer stops its corrugation forming operation; and a second control process for controlling the second driving means so that the conveying force imparting member imparts a conveying force to the core raw paper in order to convey the core raw paper to the meshing position when the stencil paper holding member is in the release position after being displaced from the holding position, The conveying force imparting member includes a rotatable pressing roll that is arranged so as to be displaceable to either a pressing position where it presses the core raw paper toward the outer peripheral surface of the preheater roll, or a spaced position where it is spaced from the outer peripheral surface of the preheater roll, and the second driving means displaces the pressing roll to either the pressing position or the spaced position, and the second control process controls the second driving means so that the pressing roll is displaced from the spaced position to the pressing position, in order for the conveying force imparting member to impart a conveying force to the core raw paper when the raw paper holding member is positioned in the release position.

[0028] Books inventionIn this embodiment, as long as there exists a state in which the conveying force applying member can actually apply a conveying force to the core raw paper when the base paper holding member is in the release position, the relationship between the time when the base paper holding member starts to move from the holding position to the release position and the time when the pressing roll starts to move from the separated position to the pressing position is not particularly limited. For example, the second control process may be configured to control the second drive means so that the pressing roll starts to move from the separated position to the pressing position to enable the application of a conveying force to the core raw paper or to actually apply a conveying force to the core raw paper at a time before the time when the base paper holding member starts to move from the holding position to the release position, i.e., when the base paper holding member is in the holding position. Alternatively, if the core raw paper does not move significantly in the direction of falling from the outer peripheral surface of the preheater roll due to its own weight when the pressing roll starts to displace from the separated position to the pressing position, the second control process may be configured to control the second driving means so that the pressing roll starts to displace from the separated position to the pressing position in order to actually apply a conveying force to the core raw paper at a time later than the time when the raw paper holding member starts to displace from the holding position to the release position, i.e., when the raw paper holding member is in the release position.

[0029] Books invention In this embodiment, the time when the preheater roll starts to rotate is not particularly limited. For example, the time when the preheater roll starts to rotate may be a time before the second control process controls the second drive means so that the pressing roll is displaced from the separated position to the pressing position, or may be a time after the second control process controls the second drive means so that the pressing roll is displaced from the separated position to the pressing position.

[0030] In a specific embodiment described in claim 8, the second control process controls the second drive means so that the pressing roll is displaced from the pressing position to the separated position when a predetermined time has elapsed since the pressing roll is displaced from the separated position to the pressing position.

[0031] In this specific embodiment, the specified time may be a fixed time that is determined in advance taking into account the time it takes for each component part of the single facer to operate reliably, or it may be a time that is set depending on variable factors such as the production speed of single-sided cardboard sheets by the single facer.

[0032] In a specific embodiment described in claim 9, the apparatus further includes a third driving means for rotating the upper and lower rolls and the preheater roll, and the control means executes a third control process for controlling the third driving means, and the second control process controls the second driving means so that when the single facer starts a corrugated forming operation for forming the core raw paper into a corrugated shape, the pressing roll is displaced from the separated position to the pressing position before the raw paper holding member is displaced from the holding position to the release position, and the third control process controls the third driving means so that the preheater roll rotates after the raw paper holding member is displaced from the holding position to the release position.

[0033] The method according to claim 10 FourthThe invention provides a system including a corrugated roll assembly including an upper corrugated roll and a lower corrugated roll that mesh with each other to form a corrugated shape of a core raw paper, the corrugated roll assembly having a structure that can be replaced with another corrugated roll assembly, a rotatable preheater roll that heats the core raw paper, a conveying path formed so that the core raw paper is conveyed in a predetermined conveying direction via the outer circumferential surface of the preheater roll to an engagement position between the upper corrugated roll and the lower corrugated roll, and a conveying position on the conveying path where the core raw paper is conveyed in the predetermined conveying direction away from the outer circumferential surface of the preheater roll toward the engagement position in order to cut the core raw paper present in the conveying path before replacement of the corrugated roll assembly, and a cutting member disposed on the conveying path between the engagement position and a conveying position. The single facer further includes a base paper holding member that is arranged on the conveying path between the discharge position and the meshing position on the conveying path and upstream of the position of the cutting member in a predetermined conveying direction, and is displaceable to either a holding position that holds the core raw paper within the conveying path in the predetermined conveying direction or a release position that releases the hold, a first driving means that displaces the base paper holding member, a conveying force imparting member that is arranged upstream of the position of the base paper holding member in the predetermined conveying direction and is operable to impart a conveying force to the core raw paper toward the meshing position, a second driving means that operates the conveying force imparting member, and a control means that controls the first driving means and the second driving means. Fourth In one aspect of the invention, the control means executes a first control process for controlling the first driving means so that the stencil paper holding member displaces from the holding position to the release position when the single facer starts a flute forming operation for forming the core raw paper into a flute shape, and so that the stencil paper holding member displaces from the release position to the holding position when the single facer stops the flute forming operation; and a second control process for controlling the second driving means so that the conveying force imparting member imparts a conveying force to the core raw paper in order to convey the core raw paper to the meshing position when the stencil paper holding member is in the release position after being displaced from the holding position to the release position. The first control process controls the first driving means so that, when the single facer stops the corrugation forming operation, the corrugation paper holding member is displaced from a release position to a holding position to hold the upstream corrugation paper portion of the corrugation paper present on the conveying path to the meshing position via the outer circumferential surface of the preheater roll, between the upstream corrugation paper portion and the downstream corrugation paper portion to be cut in the predetermined conveying direction, and controls the first driving means so that the corrugation paper holding member is maintained in the holding position until the single facer starts the corrugation forming operation. .

[0034] The method according to claim 11 FifthThe invention relates to a corrugated roll assembly including an upper corrugated roll and a lower corrugated roll which are engaged with each other to form a corrugated shape of a core raw paper, the corrugated roll assembly having a structure which can be replaced with another corrugated roll assembly; a rotatable preheater roll which heats the core raw paper; a transport path formed so that the core raw paper is transported in a predetermined transport direction via an outer circumferential surface of the preheater roll to an engagement position between the upper corrugated roll and the lower corrugated roll; and a discharge position on the transport path where the core raw paper is transported in the predetermined transport direction away from the outer circumferential surface of the preheater roll toward the engagement position, and a discharge position between the engagement position and the conveying path. a single facer including a base paper holding member disposed on a conveying path in the conveying path and displaceable to either a holding position for holding the core raw paper or a release position for releasing the hold, and a conveying force applying member operable to apply a conveying force to the core raw paper toward the meshing position, the single facer comprising: a holding step for holding the core raw paper present on the conveying path between the discharge position and the meshing position on the conveying path by displacing the base paper holding member from the release position to the holding position after the single facer has stopped a corrugation forming operation of the core raw paper and before the corrugation roll assembly is replaced; A core raw paper is present on a conveying path to a meshing position via an outer peripheral surface of a preheater roll, During the holding process, the core paper Retained The method includes a cutting process for cutting the core raw paper present on the conveying path between a specific position on the conveying path and the meshing position in a predetermined conveying direction into an upstream core raw paper portion and a downstream core raw paper portion; a release process for releasing the hold of the upstream core raw paper portion by displacing the paper holding member from the holding position to a release position after replacement of the corrugated roll assembly is completed; and a conveying force applying process for applying a conveying force to the upstream core raw paper portion released from the hold in the release process by a conveying force applying member in order to convey the core raw paper to the meshing position after replacement of the corrugated roll assembly is completed.

[0035] Fourth Inventive aspects and Fifth The invention is as follows: to third Aspects of the invention, as well as specific aspects thereof, may be embodied in a variety of configurations. Effect of the Invention

[0036] In the corrugated core paper automatic feeder of the first aspect of the invention described in claim 1, the corrugated core paper holding member is disposed on the conveying path between the meshing position and a discharge position on the conveying path where the corrugated core paper is conveyed in a predetermined conveying direction away from the outer circumferential surface of the preheater roll toward the meshing position, and is displaceable to either a holding position where the corrugated core paper is held in the conveying path in the predetermined conveying direction or a release position where the hold is released. The conveying force imparting member is operable to impart a conveying force to the corrugated core paper toward the meshing position. The first control process of the control means controls a first driving means for displacing the corrugated core paper holding member so that the corrugated core paper holding member is displaced from the holding position to the release position when the single facer starts a corrugation forming operation of forming the corrugated core paper into a corrugated shape, and the corrugated core paper holding member is displaced from the release position to the holding position when the single facer stops its corrugation forming operation. The second control process of the control means controls the second driving means to operate the conveying force imparting member so that when the paper holding member is located at the release position after being displaced from the holding position to the release position, the conveying force imparting member imparts a conveying force to the core paper to transport the core paper to the engagement position. The first control process of the control means controls the first drive means so that when the single facer stops the step forming operation, the core raw paper present on the transport path via the outer circumferential surface of the preheater roll to the engagement position is cut in a predetermined transport direction, and the first drive means is controlled so that the core raw paper holding member is displaced from a release position to a holding position to hold the upstream core raw paper portion and the downstream core raw paper portion, and so that the core paper holding member is maintained in the holding position until the single facer starts the step forming operation. As a result, when the single facer stops the step forming operation of forming the core raw paper into a step shape and the core raw paper that was fed to both step rolls of the single facer is cut, the paper holding member holds the core raw paper, so that when the single facer starts the step forming operation, the leading edge of the cut core raw paper can be fed toward the both step rolls without the operator having to manually handle the cut core raw paper.

[0037] In a specific embodiment described in claim 2, a cutting member is disposed on the transport path to cut the core raw paper present between the discharge position and the meshing position on the transport path. The base paper holding member is disposed at a position upstream of the cutting member in the predetermined transport direction. As a result, the core raw paper that has been fed to both stage rolls is cut by the cutting member at a position downstream of the base paper holding member in the predetermined transport direction, so that the base paper holding member can hold the leading end of the cut core raw paper and reliably maintain the holding state.

[0038] In a specific embodiment of claim 3, the steam delivery device has a steam delivery area for delivering steam toward the core raw paper present between the discharge position and the meshing position on the conveying path. The steam delivery area is arranged along the conveying path. The base paper holding member is arranged at a position upstream of the upstream end of the steam delivery area of ​​the steam delivery device in a predetermined conveying direction. In order for the core raw paper to be cut to be held by the base paper holding member, it is necessary that the position at which the core raw paper is cut is a position downstream of the arrangement position of the base paper holding member in the predetermined conveying direction. In this specific embodiment, since the base paper holding member is arranged at a position upstream of the upstream end of the steam delivery area of ​​the steam delivery device in the predetermined conveying direction, it is possible to cut the core raw paper with less moisture with high accuracy at a position that is less exposed to steam delivered from the steam delivery area, compared to a configuration in which the base paper holding member is arranged at a position downstream of the downstream end of the steam delivery area of ​​the steam delivery device.

[0039] The method according to claim 4 Second Invention In this embodiment, the conveying force imparting member operates to contact the central portion of the core raw paper in the paper width direction to impart a conveying force to the core raw paper. The raw paper holding member includes a plate-shaped member arranged so as to be movable toward and away from the conveying surface of the conveying path, and the pressing surface of the plate-shaped member contacts the central portion of the core raw paper to press and hold the core raw paper. The dimension of the pressing surface in the paper width direction is set to a dimension smaller than the dimension in the direction of the rotation axis of the preheater roll. As a result, the pressing surface contacts the central portion of the core raw paper, so that the core raw paper can be held by contacting the minimum necessary area without significantly disturbing the holding posture of the core raw paper. In addition, the conveying force imparting member imparts a conveying force to the central portion of the core raw paper, so that the conveying force can be effectively applied to the central portion of the core raw paper whose holding posture has been reliably maintained.

[0040] In a specific embodiment described in claim 5, the first driving means includes a lifting drive unit for lifting and lowering the plate-shaped member relative to the conveying surface, and an operating member that moves relative to the lifting drive unit when the lifting drive unit is driven and is connected to the plate-shaped member. The plate-shaped member is configured so that its weight is smaller than the movement resistance force that constantly acts on the operating member when the operating member moves relative to the lifting drive unit. As a result, even if the lifting drive unit breaks down while the single facer is performing a corrugation forming operation to form the corrugated core raw paper into a corrugated shape, the movement of the operating member relative to the lifting drive unit can be restricted by the constantly acting movement resistance force, and this restriction can prevent the plate-shaped member from accidentally abutting against the core raw paper being fed.

[0041] In a specific embodiment described in claim 6, the conveying force imparting member is arranged at a position upstream of the arrangement position of the base paper holding member in the predetermined conveying direction. In order for the conveying force imparting member to impart a conveying force to the tip portion of the cut core raw paper, it is necessary that the position where the core raw paper is cut is a position downstream of the arrangement position of the conveying force imparting member in the predetermined conveying direction. In this specific embodiment, since the conveying force imparting member is arranged at a position upstream of the arrangement position of the base paper holding member in the predetermined conveying direction, it is possible to bring the base paper holding member closer to the position where the core raw paper is cut, compared to a configuration in which the conveying force imparting member is arranged at a position downstream of the arrangement position of the base paper holding member, and the base paper holding member can reliably hold the tip portion of the cut core raw paper.

[0042] The method according to claim 7 Third InventionIn this embodiment, the conveying force imparting member includes a freely rotatable pressing roll that is arranged to be displaceable between a pressing position where the core raw paper is pressed against the outer peripheral surface of the preheater roll and a spaced position where the core raw paper is spaced from the outer peripheral surface of the preheater roll. The second driving means displaces the pressing roll to either the pressing position or the spaced position. The second control process controls the second driving means so that the pressing roll is displaced from the spaced position to the pressing position so that the conveying force imparting member imparts a conveying force to the core raw paper when the base paper holding member is in the release position. As a result, when the pressing roll is in the pressing position, the rotational force of the preheater roll is imparted to the core raw paper as a conveying force, so that a special driving means for rotating the pressing roll is not required, and the overall configuration of the conveying force imparting member can be simplified. In addition, when the single facer is test-operated, the preheater roll is rotated at a low speed for test operation. With the base paper holding member holding the core raw paper and the pressing roll in the separated position, even if the preheater roll rotates at a low speed for test operation, the preheater roll can rotate in contact with the core raw paper without applying a conveying force to the core raw paper. Therefore, even with the base paper holding member holding the core raw paper, the test operation of the single facer can be performed without any problems.

[0043] In a specific embodiment described in claim 8, the second control process controls the second drive means so that the pressing roll is displaced from the pressing position to the separated position when a predetermined time has elapsed since the pressing roll is displaced from the separated position to the pressing position. As a result, when the single facer starts a corrugated forming operation for forming the corrugated shape of the corrugated core raw paper, the time when the pressing roll is displaced from the pressing position to the separated position is determined when a predetermined time has elapsed based on the time when the pressing roll is displaced from the separated position to the pressing position, so that the control means can execute the second control process with a simple configuration without requiring a special detection means for detecting that the corrugated core raw paper has arrived at the meshing position.

[0044] In a specific embodiment described in claim 9, the control means executes a third control process for controlling a third drive means for rotating the upper and lower corrugated rolls and the preheater roll. The second control process controls the second drive means so that the pressing roll is displaced from the separated position to the pressing position before the stencil paper holding member is displaced from the holding position to the release position when the single facer starts a corrugation forming operation for forming the corrugated shape of the core raw paper. The third control process controls the third drive means so that the preheater roll rotates after the stencil paper holding member is displaced from the holding position to the release position. As a result, the pressing roll is displaced from the separated position to the pressing position before the stencil paper holding member is displaced from the holding position to the release position, so that the pressing roll and the preheater roll can hold the released core raw paper by sandwiching it therebetween, and the movement of the core raw paper in a direction dropping from the outer circumferential surface of the preheater roll can be restricted. In addition, since the preheater roll rotates after the base paper holding member is displaced from the holding position to the release position, it is possible to prevent the pressure roll from suddenly starting to rotate due to the rotational force of the rotating preheater roll.

[0045] The method according to claim 10 FourthIn the single facer of the invention, the stencil paper holding member is arranged on the conveying path between the discharge position and the meshing position on the conveying path and at a position upstream of the position of the cutting member in the predetermined conveying direction, and is displaceable to either a holding position that holds the core raw paper in the conveying path in the predetermined conveying direction or a release position that releases the hold. A conveying force applying member is arranged at a position upstream of the position of the stencil paper holding member in the predetermined conveying direction, and is operable to apply a conveying force to the core raw paper toward the meshing position. The first control process of the control means controls a first driving means that displaces the stencil paper holding member so that when the single facer starts a corrugation forming operation to form the core raw paper into a corrugated shape, the stencil paper holding member displaces from the holding position to the release position, and when the single facer stops its corrugation forming operation, the stencil paper holding member displaces from the release position to the holding position. The second control process of the control means controls the second driving means to operate the conveying force imparting member so that when the paper holding member is located at the release position after being displaced from the holding position to the release position, the conveying force imparting member imparts a conveying force to the core paper to transport the core paper to the engagement position. The first control process of the control means controls the first drive means so that when the single facer stops the step forming operation, the core raw paper present on the transport path via the outer circumferential surface of the preheater roll to the engagement position is cut in a predetermined transport direction, and the first drive means is controlled so that the core raw paper holding member is displaced from a release position to a holding position to hold the upstream core raw paper portion and the downstream core raw paper portion, and so that the core paper holding member is maintained in the holding position until the single facer starts the step forming operation. As a result, when the single facer stops the step forming operation of forming the core raw paper into a step shape, and the core raw paper that was fed to both step rolls of the single facer is cut using the cutting member, the paper holding member holds the core raw paper, so that when the single facer starts the step forming operation, the leading edge of the cut core raw paper can be fed toward both step rolls without the manual operation of an operator handling the cut core raw paper.

[0046] The method according to claim 11 Fifth In the automatic corrugation paper feed method according to the invention, the holding step holds the corrugation paper present on the transport path between the discharge position and the meshing position on the transport path by displacing the corrugation paper holding member from the release position to the holding position after the single facer stops the corrugation formation operation of the corrugation paper and before the corrugation roll assembly is replaced. A core raw paper is present on a conveying path to a meshing position via an outer peripheral surface of a preheater roll, During the holding process, the core paper RetainedThe core raw paper present on the conveying path between a specific position on the conveying path and the meshing position is cut into an upstream core raw paper portion and a downstream core raw paper portion in a predetermined conveying direction. The release step, after replacement of the corrugated roll assembly is completed, displaces the raw paper holding member from the holding position to the release position to release the holding of the upstream core raw paper portion. The conveying force imparting step, after replacement of the corrugated roll assembly is completed, imparts a conveying force to the upstream core raw paper portion released from the holding in the release step by the conveying force imparting member in order to convey the core raw paper to the meshing position. As a result, after the single facer stops the corrugation forming operation of forming the core raw paper into a corrugated shape, the core raw paper that has been fed to both corrugation rolls of the single facer is held by the raw paper holding member in the holding step, and the held core raw paper is cut in the cutting step, so that when the single facer starts the corrugation forming operation, the leading end of the cut core raw paper can be fed toward both corrugation rolls without the manual operation of an operator handling the cut core raw paper. [Brief description of the drawings]

[0047] [Figure 1] FIG. 1 is a front view showing a single facer 1 according to an embodiment of the present invention. [Diagram 2] 1 is an enlarged front view of a transport path 60 between an upper roll 22 and a lower roll 24 in a single facer 1 and a third preheater roll 36, the transport path 60 being in a state in which a core raw paper PA1 is being transported. [Diagram 3] FIG. 2 is a plan view of the conveying path 60 seen from above. [Figure 4] 3 is an enlarged front view showing the stencil sheet holding mechanism 3 and the conveying force imparting mechanism 5 disposed in the vicinity of the third preheater roll 36. FIG. [Diagram 5] 13 is a side view of the stencil paper holding mechanism 3 as viewed from the right when the plate-shaped member 84 is in the released position. FIG. [Figure 6] 13A and 13B are a front view and a side view of the stencil paper holding mechanism 3, respectively, when the plate-shaped member 84 is in the pressing position, and a side view of the stencil paper holding mechanism 3, respectively, when viewed from the right. [Figure 7]4 is a side view of the conveying force imparting mechanism 5 as viewed from the right. FIG. [Figure 8] FIG. 2 is a block diagram showing the electrical configuration of the single facer 1. [Figure 9] 4 is a flowchart showing a production start control process in a single facer 1. [Figure 10] 4 is a flowchart showing a paper passing control process in the single facer 1. [Figure 11] 4 is a flowchart showing a production end control process in a single facer 1. [Figure 12] 13 is an explanatory diagram showing a state in which the downstream side portion of the core raw paper PA1 is discharged from both corrugated rolls 22, 24 after the core raw paper PA1 has been cut. FIG. [Figure 13] 1 is an explanatory diagram showing a state in which a pressing roll 110 is displaced from a separated position to a pressing position and presses the core raw paper PA1. FIG. [Figure 14] 13 is an explanatory diagram showing a state in which the core raw paper PA1 is fed toward the meshing position P3. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0048] <Embodiment> A single facer according to an embodiment of the present invention will be described below with reference to the drawings. The single facer is known from JP 10-52875 A and the like as a machine for producing single-faced corrugated cardboard sheets. The single facer includes an upper corrugation roll and a lower corrugation roll for forming corrugations in a wavy manner on the corrugated cardboard raw paper supplied from a corrugated cardboard splicer, and a glue application device for applying glue to the corrugated cardboard raw paper. The single facer produces a single-faced corrugated cardboard sheet by bonding the liner raw paper supplied from a liner splicer to the corrugated cardboard raw paper to which glue has been applied. The upper corrugation roll and the lower corrugation roll are configured as replaceable corrugated roll cartridges, and are replaced according to the type of flute of the single-faced corrugated cardboard sheet. The basic configuration of the corrugated roll cartridge and the basic configuration of the moving mechanism for moving the corrugated roll cartridge for replacement are known from JP 2015-24577 A and the like. FIG. 1 is a front view of the single facer 1 according to this embodiment as viewed from the front. The directions indicated by the arrows in Fig. 1 are the up-down direction and the left-right direction, and the direction perpendicular to both directions is the front-rear direction. In Fig. 2 and subsequent drawings, each direction is indicated according to the directions shown in Fig. 1.

[0049] [Mechanical configuration of single facer 1] The mechanical configuration of the single facer 1 will be described mainly with reference to Fig. 1 and Fig. 2. In Fig. 1, a core raw paper PA1 is supplied to the single facer 1 from a core splicer 10, and a liner raw paper PA2 is supplied to the single facer 1 from a liner splicer 12. After being produced by the single facer 1, a single-faced corrugated cardboard sheet PA3 is sent to a known bridge by a belt conveyer 14. The bridge has a configuration for retaining the single-faced corrugated cardboard sheet PA3. The single facer 1 of this embodiment includes a raw paper holding mechanism 3 for holding the core raw paper PA1, and a conveying force imparting mechanism 5 for imparting a conveying force to the core raw paper PA1.

[0050] (Detailed configuration of single facer 1) The detailed configuration of the single facer 1 will be described. In FIG. 1, the single facer 1 further includes a device frame 20, an upper stage roll 22, a lower stage roll 24, a number of preheater rolls, and a number of guide rolls in addition to the base paper holding mechanism 3 and the conveying force imparting mechanism 5. A known wrap roll is supported so as to be swingable around the rotation center of each preheater roll of the multiple preheater rolls, and is disposed in the vicinity of each preheater roll. The length of the core base paper PA1 or the liner base paper PA2 that contacts the outer peripheral surface of each preheater roll is adjusted according to the swing position of the wrap roll. The upper stage roll 22 and the lower stage roll 24 are configured as a stage roll cartridge that is detachably attached to the device frame 20. The core base paper PA1 is inserted from the core splicer 10 into the insertion port 26 of the device frame 20. The inserted core base paper PA1 is supplied to the first preheater roll 30 via the wrap roll. The first preheater roll 30 is located on the left side close to the insertion opening 26 and at a middle height of the apparatus frame 20 in the vertical direction, and is rotatably supported by the apparatus frame 20. SS1 is formed below the first preheater roll 30 within the apparatus frame 20.

[0051] The core raw paper PA1 is supplied from the first preheater roll 30 to the second preheater roll 32 via a number of guide rolls and a wrap roll. The second preheater roll 32 is disposed in the first working space. SS1 The second working space is supported by the device frame 20 in a rotatable manner at a position closer to the floor surface of the device frame 20 than the left side. SS2 is formed above the second preheater roll 32 and below the belt conveyor 14 supported by the device frame 20. The core raw paper PA1 is supplied from the second preheater roll 32 to the third preheater roll 36 via the wrap roll 34. The core raw paper PA1 is supplied from the third preheater roll 36 towards the upper roll 22 and the lower roll 24. The third preheater roll 36 is disposed in the second working space. SS2The third preheater roll 36 is rotatably supported by the device frame 20 at a position to the left of the first working space. The third preheater roll 36 is a preheater roll disposed closest to the upper roll 22 and the lower roll 24 in the supply direction DA in which the core raw paper PA1 is supplied toward the upper roll 22 and the lower roll 24. SS1 is a space provided for an operator to manually feed the core raw paper PA1 into the first and second preheater rolls 30, 32 and the guide rolls and wrap rolls disposed around both preheater rolls 30, 32 when a new core raw paper PA1 is initially supplied from the core splicer 10 to the single facer 1. SS2 is a space provided for an operator to manually feed the core raw paper PA1, which has been fed to the second preheater roll 32, to the wrap roll 34 and the third preheater roll 36 when a new core raw paper PA1 is first supplied from the core splicer 10 to the single facer 1, and to manually feed the core raw paper PA1 further to the meshing position of the two stage rolls 22, 24. SS2 is also a space provided for an operator to manually cut the core raw paper PA1 in the width direction of the raw paper, which is the front-rear direction, when the two corrugated rolls 22, 24 are being replaced.

[0052] The liner base paper PA2 is inserted from the liner splicer 12 into the insertion opening 40 of the device frame 20 via a known device for correcting warping of the liner base paper PA2. The inserted liner base paper PA2 is supplied to a fourth preheater roll 42 via a number of guide rolls and a wrap roll. The liner base paper PA2 is supplied from the fourth preheater roll 42 to a fifth preheater roll 44. The fourth preheater roll 42 and the fifth preheater roll 44 are arranged vertically and are each rotatably supported by the device frame 20 at a position close to the insertion opening 40 on the right side and at a position at the middle height of the device frame 20 in the vertical direction. Third working space SS3is formed to the right of the fourth preheater roll 42 and the fifth preheater roll 44 in the device frame 20. The liner base paper PA2 is supplied from the fifth preheater roll 44 to the sixth preheater roll 46 via a plurality of wrap rolls and a plurality of guide rolls. The sixth preheater roll 46 is located in the third working space. SS3 The liner base paper PA2 is supplied from the sixth preheater roll 46 to the press roll 48. The press roll 48 is disposed so as to be pressed against the upper roll 24, and is rotatably supported by the apparatus frame 20. SS3 is a space provided for an operator to manually feed the liner base paper PA2 into the fourth to sixth preheater rolls 42-46 and the guide rolls and wrap rolls arranged around these preheater rolls 42-46 when new liner base paper PA2 is initially supplied from the liner splicer 12 to the single facer 1.

[0053] A known glue roll 50 and doctor roll 52 are arranged adjacent to the upper roll 22 and apply glue to the corrugated core paper PA1 formed by the upper roll 22 and the lower roll 24. A press roll 48 presses the liner paper PA2 against the corrugated core paper PA1 to which glue has been applied, bonding them together. The bonded core paper PA1 and liner paper PA2 are sent toward the belt conveyor 14 via a guide roll 54 as a single-faced corrugated cardboard sheet PA3.

[0054] (Detailed configuration of the upper roll 22 and the lower roll 24 and their surroundings) The detailed configuration of the upper roll 22 and the lower roll 24 will be described mainly with reference to Figs. 2 and 3. Fig. 2 shows an enlarged view of a transport path 60 in the vicinity of the upper roll 22 and the lower roll 24, in which the core raw paper PA1 is transported. Fig. 3 shows the transport path 60 between the two rolls 22, 24 and the third preheater roll 36, as viewed from above. In this embodiment, the position of the outer peripheral surface located at the top of the outer peripheral surface 36A of the third preheater roll 36 in Fig. 2 is at approximately the same height in the vertical direction as the position of the outer peripheral surface located at the top of the outer peripheral surface 24A of the lower roll 24. The transport path 60 is formed by extending in a substantially straight line in the horizontal direction from the portion of the outer peripheral surface located at the top of the third preheater roll 36 to the portion of the outer peripheral surface located at the top of the lower roll 24.

[0055] The steam chamber 62 is disposed between the third preheater roll 36 and the lower roll 24 to apply steam to the core raw paper PA1 from below, and is supported by the device frame 20. The first guide 64 is fixed to the right side of the steam chamber 62 and extends almost horizontally to the right up to the vicinity of the outer circumferential surface 36A of the third preheater roll 36. The second guide 66 is fixed to the left side of the steam chamber 62 and extends almost horizontally to the left. The third guide 68 is disposed between the second guide 66 and the lower roll 24 and extends rightward from the vicinity of the outer circumferential surface 24A of the lower roll 24 toward the left end of the second guide 66. The conveying surface of the conveying path 60 is formed by the upper surface 64A of the first guide 64, the upper surface 62A of the steam chamber 62, the upper surface of the second guide 66, and the upper surface of the third guide 68. The vertical height position of the upper surface 64A of the first guide 64 is set to a position slightly higher than the vertical height positions of the upper surface 62A of the steam chamber 62 and the upper surface of the second guide 66. The vertical height position of the upper surface of the third guide 68 is set to a position slightly lower than the vertical height positions of the upper surface 62A of the steam chamber 62 and the upper surface of the second guide 66.

[0056] In FIG. 3, the device frame 20 includes a front frame wall portion 20A and a rear frame wall portion 20B. The third preheater roll 36 has a rotating shaft extending in the front-rear direction. The rotating shaft 36A is rotatably supported by both frame walls 20A and 20B. The rotating shaft of the third preheater roll 36 is connected to the output shaft of the drive motor 70 via a known pulley and belt. The drive motor 70 is fixed to the front frame wall portion 20A by a known fixing means. The steam chamber 62 has an upper surface 62A that extends long in the front-rear direction and has a large number of steam delivery holes formed therein. The steam chamber 62 is fixed to both frame walls 20A and 20B by a known fixing means. The first guide 64 and the second guide 66 extend in the front-rear direction with the same width as the front-rear width of the steam chamber 62. The front-rear width of the third preheater roll 36 is set to a width larger than the maximum front-rear width of the core raw paper PA1 used in this embodiment. The widths of the first guide 64, the steam chamber 62, and the second guide 68 in the front-rear direction are set to be the same and slightly larger than the width of the third preheater roll 36 in the front-rear direction.

[0057] In FIG. 3, the corrugated roll cartridge including the upper corrugated roll 22 and the lower corrugated roll 24 includes a front cartridge wall 72A and a rear cartridge wall 72B. The front cartridge wall 72A and the rear cartridge wall 72B are detachably attached to the front frame wall 20A and the rear frame wall 20B, respectively. Each of the upper corrugated roll 22 and the lower corrugated roll 24 has a rotation shaft, and the rotation shaft of each corrugated roll is rotatably supported by the front cartridge wall 72A and the rear cartridge wall 72B. The third guide 68 extends long in the front-rear direction and is connected to both cartridge walls 72A and 72B via a known connecting means. The front-rear width of the third guide 68 is set to a width larger than the maximum front-rear width of the core raw paper PA1 used in this embodiment and smaller than the front-rear width of the second guide 66.

[0058] 3, the cutting groove 74 is formed on the upper surface 62A of the steam chamber 62 and extends linearly in the front-rear direction. In this embodiment, when the core raw paper PA1 is present in the conveying path 60 immediately after the single facer 1 stops production, the second working space SS2 An operator working in this manner can press the tip of a tool member such as a cutter into the cutting groove 74 and move the tool member back and forth to cut the core raw paper PA1 in the raw paper width direction along the cutting groove 74.

[0059] (Detailed configuration of the stencil paper holding mechanism 3) The detailed configuration of the stencil paper holding mechanism 3 will be described mainly with reference to Figs. 4 to 6. Fig. 4 shows an enlarged view of the stencil paper holding mechanism 3 and the conveying force imparting mechanism 5, which are disposed adjacent to the upper part of the outer peripheral surface 36A of the third preheater roll 36 when the core raw paper PA1 is not being supplied. Fig. 5 shows an enlarged view of the stencil paper holding mechanism 3, viewed from the right, when the core raw paper PA1 is being supplied. In Fig. 4, the stencil paper holding mechanism 3 is disposed downstream of the upper part of the outer peripheral surface 36A of the third preheater roll 36 in the supply direction DA of the core raw paper PA1. In Fig. 3, the stencil paper holding mechanism 3 is fixed to the first support beam 80. The first support beam 80 is installed between the front frame wall 20A and the rear frame wall 20B. The stencil paper holding mechanism 3 is disposed so that the center position of the stencil paper holding mechanism 3 in the front-rear direction is located on a left-right extension line CL1 that passes through the center position of the width of the third preheater roll 36 in the front-rear direction. In this embodiment, the core raw paper PA1 is supplied from the core splicer 10 to the single facer 1 with the front-to-back position of the core raw paper PA1 adjusted so that the center position of the core raw paper PA1 in the front-to-back direction is located on the extension line CL1.

[0060] In FIG. 4, the stencil paper holding mechanism 3 includes an air cylinder 82, a plate-shaped member 84, and two lifting guide shafts 86A and 86B. In FIG. 5, the air cylinder 82 has an actuating rod 82A that can be displaced in the vertical direction. FIGS. 4 and 5 show a state in which the actuating rod 82A is displaced upward to separate the plate-shaped member 84 from the core stencil paper PA1, that is, a state in which the plate-shaped member 84 is in the release position. The plate-shaped member 84 includes a pressing plate portion 88, an elastic pressing body 90, and a mounting plate portion 92. The pressing plate portion 88 has a rectangular shape that is long in the front-rear direction, and is connected to the actuating rod 82A of the air cylinder 82 and to the lower ends of the two lifting guide shafts 86A and 86B. The elastic pressing body 90 is made of an elastic material such as silicone rubber, and is joined to the lower surface of the mounting plate portion 92. The mounting plate 92, like the pressing plate 88, has a rectangular shape that is long in the front-rear direction, and is fixed to the underside of the pressing plate 88 by a fixing means such as a bolt. The elastic pressing body 90 has a flat underside that serves as a pressing surface for pressing the core raw paper PA1. The cylinder case of the air cylinder 82 has two guide holes that penetrate in the vertical direction. The two lifting guide shafts 86A, 86B are inserted into the two guide holes of the cylinder case, respectively, and guide the plate-like member 84 in the vertical direction.

[0061] In FIG. 4, a holding recess 96 is formed on the upper surface 64A of the first guide 64. The holding recess 96 has a bottom surface formed by a flat surface to cooperate with the lower surface of the elastic presser body 90 to clamp the core raw paper PA1. The left-right dimension L1 of the holding recess 96 is set to be larger than the left-right dimension L2 of the elastic presser body 90. The left-right dimension L2 of the elastic presser body 90 is set to be approximately the same as the left-right dimension of the presser plate portion 88. In FIG. 5, the front-rear dimension L3 of the holding recess 96 is set to be larger than the front-rear dimension L4 of the elastic presser body 90 and smaller than the front-rear dimension of the presser plate portion 88. The mounting plate portion 92 has the same left-right and front-rear dimensions as the presser plate portion 88. Setting the dimensions L1, L3 of the holding recess 96 allows the lower portion of the elastic presser body 90 to enter inside the holding recess 96. The maximum width in the front-to-rear direction of the core raw paper PA1 that can be used in this embodiment is 2500 mm. In this embodiment, the front-to-rear width of the presser plate portion 88 is set to a width smaller than 1 / 15 of the maximum width of the core raw paper PA1, and the left-to-right dimension of the presser plate portion 88 is set to about 1 / 2 the front-to-rear width of the presser plate portion 88.

[0062] Fig. 6(A) shows the stencil paper holding mechanism 3 as viewed from the front in a state in which the elastic pressing body 90 of the plate-shaped member 84 presses and holds the core raw paper PA1. Fig. 6(B) shows the stencil paper holding mechanism 3 as viewed from the right in a state in which the elastic body 90 of the plate-shaped member 84 presses and holds the core raw paper PA1. Figs. 6(A) and 6(B) show a state in which the actuating rod 82A is displaced downward so that the plate-shaped member 84 holds the core raw paper PA1, i.e., a state in which the plate-shaped member 84 is in the holding position. In a state in which the elastic pressing body 90 of the plate-shaped member 84 presses and holds the core raw paper PA1, the elastic pressing body 90 presses the core raw paper PA1 into the holding recess 96, thereby holding the core raw paper PA1 in a slightly bent state. In this holding state, the lower surface of the elastic presser 90 and the bottom surface of the holding recess 96 sandwich the core raw paper PA1.

[0063] The air cylinder 82 has a known configuration including a cylinder tube, a piston that moves in the cylinder tube, two ports provided in the cylinder tube, and an actuation rod 82A connected to the piston. The piston has a sliding resistance between the inner circumferential surface of the cylinder tube, and the actuation rod 82A has a sliding resistance between the piston and a rod packing provided in the cylinder tube. When compressed air is supplied to one of the two ports and the actuation rod 82A is displaced in the vertical direction relative to the cylinder tube of the air cylinder 82, the sliding resistance inherent to the air cylinder 82 always acts on the actuation rod 82A. In this embodiment, the total weight of the plate-like member 84 and both lifting guide shafts 86A and 86B is set in consideration of the dimensions and materials of the plate-like member 84 and both lifting guide shafts 86A and 86B so that the total weight of the plate-like member 84, the two lifting guide shafts 86A and 86B, and the actuation rod 82A is sufficiently smaller than the sliding resistance of the air cylinder 82. In this embodiment, both lift guide shafts 86A, 86B, the presser plate portion 88 of the plate-like member 84, and the mounting plate portion 92 are made of a metal material such as carbon steel.

[0064] (Detailed configuration of conveying force imparting mechanism 5) The detailed configuration of the conveying force imparting mechanism 5 will be described mainly with reference to Fig. 4 and Fig. 7. Fig. 7 shows the conveying force imparting mechanism 5 as viewed from the right. The conveying force imparting mechanism 5 is disposed at a position upstream of the upper part of the outer peripheral surface 36A of the third preheater roll 36 in the supply direction DA of the core raw paper PA1. In Fig. 3, the conveying force imparting mechanism 5 is fixed to the second support beam 100 and the third support beam 102. The second support beam 100 and the third support beam 102 are installed between the front frame wall portion 20A and the rear frame wall portion 20B. The conveying force imparting mechanism 5 is disposed so that the center position of the conveying force imparting mechanism 5 in the front-rear direction is located on a left-right extension line CL1 passing through the center position of the width of the third preheater roll 36 in the front-rear direction.

[0065] The conveying force imparting mechanism 5 includes a support block 104, an air cylinder 106, a connecting arm mechanism 108, and a pressing roll 110. The support block 104 includes an upper support plate portion 112, a pair of side walls 114, 116, and a pair of upper bearing portions 118, 120. The upper support plate portion 112 is fixed to the upper portions of the second support beam 100 and the third support beam 102. In Figs. 4 and 7, the pair of side walls 114, 116 are arranged at intervals in the front-rear direction, and are fixed to the opposing side portions of the second support beam 100 and the third support beam 102 in the left-right direction. The pair of upper bearing portions 118, 120 extend upward from the upper support plate portion 112, and are arranged at intervals in the front-rear direction in Fig. 7.

[0066] A pair of arm supports 122, 124 extend downward from the second support beam 100 and are spaced apart in the front-rear direction in FIG. 7. The connecting arm mechanism 108 includes a pair of arm plates 126, 128. In FIG. 7, the pair of arm plates 126, 128 are spaced apart in the front-rear direction. In FIG. 4, the left upper end portions of both arm plates 126, 128 are supported by both arm supports 122, 124 so as to be swingable around a connecting shaft 130. The pressing roll 110 is supported by the lower end portions of both arm plates 126, 128 so as to be freely rotatable around a connecting shaft 132. The maximum width in the front-rear direction of the core raw paper PA1 that can be used in this embodiment is 2500 mm. 7 is about 1 / 25 of the maximum width of the core raw paper PA1, and the diameter of the pressing roll 110 is set to about 50 to 100 mm. In this embodiment, the outer peripheral surface portion of the pressing roll 110 is made of an elastic material such as silicone rubber, and the core portion other than the outer peripheral surface portion of the pressing roll 110 is made of a lightweight metal material such as an aluminum alloy.

[0067] In FIG. 7, the air cylinder 106 has an actuating rod 106A that can be displaced in the vertical direction and a pair of support shafts 106B, 106C. The support shafts 106B, 106C are rotatably supported by the upper bearings 118, 120, respectively. The air cylinder 106 is supported by the support block 104 so as to be swingable around the support shafts 106B, 106C. The lower end portion of the actuating rod 106A is connected to a rod bearing portion 134. The rod bearing portion 134 has a bearing portion 134A. The right upper end portions of the arm plates 126, 128 support a connecting shaft 136 that is inserted into the bearing portion 134A. The actuating rod 106A is connected to the arm plates 126, 128 by the rod bearing portion 134 so as to be rotatable around the connecting shaft 136. 4 and 7 show a state in which the actuating rod 82A is displaced upward to separate the pressing roll 110 from the third preheater roll 36, i.e., the pressing roll 110 is in the separated position. In Fig. 4, the pressing roll 110 shown by the two-dot chain line shows a state in which the actuating rod 82A is displaced downward to press the core raw paper PA1 toward the third preheater roll 36, i.e., the pressing roll 110 is in the pressing position. In this embodiment, both arm plate portions 126, 128 and the rod bearing portion 134 are made of a metal material such as carbon steel.

[0068] Similar to the air cylinder 82, the air cylinder 106 has a known configuration including a cylinder tube, a piston that moves inside the cylinder tube, two ports provided in the cylinder tube, and an actuation rod 106A connected to the piston. The piston has a sliding resistance between itself and the inner peripheral surface of the cylinder tube, and the actuation rod 106A has a sliding resistance between itself and a rod packing or the like provided in the cylinder tube. When compressed air is supplied to one of the two ports and the actuation rod 106A is displaced in the vertical direction relative to the cylinder tube of the air cylinder 106, the sliding resistance inherent to the air cylinder 106 constantly acts on the actuation rod 106A. In this embodiment, the weight of the pressing roll 106 is set taking into consideration the diameter and front-to-rear width L5 of the pressing roll 106 so that approximately half the total weight of the pressing roll 110, both arm plate portions 126, 128, rod bearing portion 134, connecting shafts 132, 136, and operating rod 106A is sufficiently smaller than the sliding resistance of the air cylinder 106.

[0069] (Arrangement of the base paper holding mechanism 3 and the conveying force imparting mechanism 5 relative to the third preheater roll 36) In Fig. 2 and Fig. 4, the center line CL2 is a line that passes through the rotation center of the third preheater roll 36 and extends in the vertical direction. The center line CL3 is a line that passes through the center position of the pressing plate part 88 in the left-right direction and extends in the vertical direction. The extension line CL4 is a line that passes through the contact position P1 where the pressing roll 110 contacts the third preheater roll 36 and the rotation center of the third preheater roll 36, as shown by the two-dot chain line in Fig. 4. The discharge position P2 is a position where the core raw paper PA1 shown by the two-dot chain line in Fig. 4 is sent out in the supply direction DA away from the outer peripheral surface part located at the uppermost position of the outer peripheral surface 36A of the third preheater roll 36. The meshing position P3 is a position where the two corrugated rolls 22, 24 mesh with each other. The distance D1 is the distance from the center line CL2 to the center line CL3. The angle θ is the angle of rotation in the clockwise direction from the center line CL2 to the extension line CL4 in FIG.

[0070] In this embodiment, the distance D1 is set to a distance smaller than 1 / 2 the diameter of the third preheater roll 36. Therefore, the stencil paper holding mechanism 3 is disposed downstream of the discharge position P2 in the supply direction DA, at a distance smaller than 1 / 2 the diameter of the third preheater roll 36, and very close to the third preheater roll 36. In particular, in FIG. 4, the left end portions of the pressing plate portion 88 and the elastic pressing body 90 are disposed within a range to the left of the center line CL2, within a distance of 1 / 2 the diameter of the third preheater roll 36. Also, as shown in FIG. 2, the stencil paper holding mechanism 3 is disposed at a position closer to the discharge position P2 than the meshing position P3.

[0071] The angle θ is set to an angle that can provide a sufficient conveying force to supply the core raw paper PA2 from the discharge position P2 in the supply direction DA when the pressing roll 110 presses the core raw paper PA1 toward the outer circumferential surface 36A of the third preheater roll 36. In this embodiment, the angle θ is set to an angle smaller than 45 degrees, for example, 30 degrees. Therefore, the conveying force providing mechanism 5 is disposed close to the discharge position P2 at a position upstream of the discharge position P2 in the supply direction DA and where the angle θ is smaller than 45 degrees.

[0072] [Single Facer 1 Electrical Configuration] The electrical configuration of the single facer 1 of this embodiment will be described with reference to Fig. 8. Fig. 8 is a block diagram showing the electrical configuration of the single facer 1 of this embodiment. In Fig. 8, a production management device 200 is a device that manages the production operation of the entire corrugator including a plurality of processing devices such as a double facer, a slitter scorer, and a cut-off device together with the single facer 1 of this embodiment in order to produce a double-sided corrugated cardboard sheet. In this embodiment, the production management device 200 sends control command information regarding the production speed, flute type, production length, etc. of the single-faced cardboard sheet PA3 in each order to the single facer control device 210 according to a production management plan determined in advance for a large number of consecutive orders.

[0073] The single facer control device 210 is a device that performs production management control for the single facer 1 of this embodiment according to control command information sent from the production management device 200. The single facer control device 210 is connected to a program memory 220 and a work memory 230, and together with these memories, constitutes a computer that controls the single facer 1 of this embodiment. The program memory 220 is a memory that stores a main control program that controls the entire single facer 1, three subroutine control programs that execute three control processes shown in Figures 9 to 11, and various set values. The work memory 230 is a memory that temporarily stores various information sent from the production management device 200 and the results of calculation processing associated with the execution of each control program. The single facer control device 210 is equipped with an internal counter that performs a timekeeping operation during the execution of the subroutine control program, etc.

[0074] The single facer control device 210 is connected to a display unit 240 and an operation unit 250. The display unit 240 displays the production progress status of the current order currently being executed by the single facer 1, and the production plan contents of the next series of orders, etc., with respect to a large number of consecutive orders. The operator can check the "remaining length", which is the length of the single-faced corrugated cardboard sheet PA3 to be produced by the end of the current order, on the display screen of the display unit 240 as the production progress status of the current order. The value representing the "remaining length" is decreased as the current order progresses. The operator can recognize that the current order has ended when he confirms that the value representing the "remaining length" has become "0". When the current order has ended, the order to be executed next is displayed on the display unit 240 as a new current order.

[0075] The operation unit 250 includes a number of operation means that can be operated by an operator, such as an operation button 252, a stop button 254, a core passing button 256, an inching button 258, an idling button 260, and an operation button for instructing the movement of the corrugated roll cartridge for replacement. The operation button 252 is a button for instructing the operation of the single facer 1 to start the production of the single-faced corrugated cardboard sheet PA3. The stop button 254 is a button for instructing the stop of the single facer 1. The core passing button 256 is a button for instructing the process for supplying the core raw paper PA1 toward the meshing position P3. The inching button 258 is a button for instructing the process for discharging the core raw paper PA1 from both corrugated rolls 22, 24. The idling button 260 is a button for instructing a trial run of the single facer 1 before the actual production of the single-faced corrugated cardboard sheet PA3.

[0076] The corrugator includes a boiler, a compression pump, and a vacuum pump that are commonly used in many processing devices. When the main power switch of the corrugator is turned on, power is supplied to the boiler, the compression pump, and the vacuum pump. The boiler supplies heated steam to each preheater roll and the steam chamber 62 in the single facer 1. The compression pump supplies compressed air to the air cylinders 82 and 106 in the single facer 1 via an electromagnetic valve. The vacuum pump makes the pressure in the internal space of the upper roll 22 negative in order to suck the corrugated core raw paper PA1 onto the outer peripheral surface of the upper roll 22 in the single facer 1. The single facer 1 includes a control power switch. When the control power switch is turned on, power is supplied to each of the components of the single facer 1, including the single facer control device 210, many drive circuits, and many drive motors. When the control power switch is turned on, the single facer control device 210 starts executing a main control program.

[0077] The single facer control device 210 is connected to the solenoid valve drive circuit 270, the preheater drive circuit 280, the corrugated roll drive circuit 290, and the conveyor drive circuit 300. The solenoid valve drive circuit 270 drives the holding solenoid valve 272 and the conveying solenoid valve 274 in accordance with a drive control command from the single facer control device 210. The holding solenoid valve 272 is connected to the air cylinder 82 of the stencil holding mechanism 3. The conveying solenoid valve 274 is connected to the air cylinder 106 of the conveying force imparting mechanism 5. The preheater drive circuit 280 drives each drive motor of the preheater drive motor group 282 in accordance with a drive control command from the single facer control device 210. Each drive motor of the preheater drive motor group 282 rotates each preheater roll of the preheater roll group 284. The preheater drive motor group 282 includes a drive motor 70 that rotates the third preheater roll 36. The preheater roll group 284 includes the first to sixth preheater rolls 30, 32, 36, 42, 44, and 46. The corrugated roll drive circuit 290 drives the corrugated roll drive motor 292 in accordance with a drive control command from the single facer control device 210. The corrugated roll drive motor 292 is fixed to the device frame 20 of the single facer 1 to rotate both the upper and lower rolls 22 and 24. The conveyor drive circuit 300 drives the conveyor drive motor 302 in accordance with a drive control command from the single facer control device 210. The conveyor drive motor 302 is fixed to the device frame 20 of the single facer 1 to operate the belt conveyor 14. The single facer control device 210 is also connected to a corrugated roll cartridge drive circuit (not shown). The corrugated roll cartridge drive circuit drives a plurality of drive motors that operate a moving mechanism that moves the corrugated roll cartridge in the vertical and horizontal directions in accordance with a drive control command from the single facer control device 210 .

[0078] (Detailed configuration of the holding solenoid valve 272 and the conveying solenoid valve 274) The holding solenoid valve 272 is displaceable between two different port switching positions and has a known configuration with two solenoids. The holding solenoid valve 272 has five ports, an up solenoid 272U, and a down solenoid 272D. The five ports are a supply port connected to the compression pump, two connection ports respectively connected to two ports of the air cylinder 82, and two exhaust ports. When either one of the solenoids 272U and 272D is excited, that is, when one solenoid is turned on and the other solenoid is turned off, the holding solenoid valve 272 is displaced to one of the two port switching positions. According to each port switching position of the holding solenoid valve 272, each connection port of the two connection ports communicates with one of the exhaust ports of the two exhaust ports and one of the supply ports. In this embodiment, when the up solenoid 272U is turned on and the down solenoid 272D is turned off, the operating rod 82A of the air cylinder 82 rises, and the plate-shaped member 84 rises to the release position, which is a position separated from the core raw paper PA1, as shown in Fig. 5. When the up solenoid 272U is turned off and the down solenoid 272D is turned on, the operating rod 82A of the air cylinder 82 descends, and the plate-shaped member 84 descends to the holding position, which is a position where the plate-shaped member 84 presses the core raw paper PA1, as shown in Fig. 6. When both solenoids 272U and 272D are turned off, the holding solenoid valve 272 maintains the switching state of the five ports, and the air cylinder 82 holds the plate-shaped member 84 in the position where it was previously located.

[0079] The conveying solenoid valve 274 is displaceable between two different port switching positions and has a known configuration with one solenoid. The conveying solenoid valve 274 has five ports, a lowering solenoid 274D, and a built-in spring. The five ports are a supply port connected to the compression pump, two connection ports respectively connected to the two ports of the air cylinder 106, and two discharge ports. When the lowering solenoid 274D is excited, that is, when the lowering solenoid 274D is turned on, the conveying solenoid valve 274 is displaced to one of the two port switching positions, and the built-in spring is elastically deformed to a compressed state. When the lowering solenoid 274D is demagnetized, that is, when the lowering solenoid 274D is turned off, the conveying solenoid valve 274 is displaced to the other of the two port switching positions by the elastic restoring force of the built-in spring. According to the port switching position of each of the transport solenoid valves 274, each of the two connection ports communicates with one of the two discharge ports and one of the supply ports. In this embodiment, when the lowering solenoid 274D is turned on, the operating rod 106A of the air cylinder 106 is lowered, and as shown by the two-dot chain line in Fig. 4, the pressing roll 110 is lowered to a pressing position where it presses the core raw paper PA1. When the lowering solenoid 274D is turned off, the operating rod 106A of the air cylinder 106 is raised, and as shown by the solid line in Fig. 4, the pressing roll 110 is raised to a separating position where it is separated from the outer circumferential surface 36A of the third preheater roll 36.

[0080] [Operation and action of single facer 1] The operation and function of the single facer 1 of this embodiment will be described mainly with reference to Figures 9 to 11. Figures 9 to 11 respectively show the production start control process, the paper passing control process, and the production end control process in the single facer 1. The single facer control device 210 executes each of the three control processes shown in Figures 9 to 11 while executing the main control process according to the main control program.

[0081] When an operator turns on the corrugator's main power switch, power is supplied to the boiler, compression pump, vacuum pump, etc. To start production of single-faced corrugated cardboard sheet PA3, an operator turns on the single facer 1's control power switch, and power is supplied to the components of the single facer 1, including the single facer controller 210. The single facer controller 210 reads the main control program from the program memory 220 and starts executing the main control process.

[0082] After the execution of the main control process is started, the operator presses the idling button 260, and this first pressing operation starts idling operation according to the main control process. To start idling operation, the single facer control device 210 sends drive control commands to the drive circuits 280, 290, 300 so that all the preheater rolls and both stage rolls 22, 24 in the single facer 1 rotate and the belt conveyor 14 operates.

[0083] At the time when the idling operation starts, as shown in Fig. 12, the plate-like member 84 of the stencil paper holding mechanism 3 is located at a holding position where it presses the cut core raw paper PA1, and the pressing roller 110 of the conveying force imparting mechanism 5 is located at a separated position away from the outer circumferential surface 36A of the third preheater roll 36. When the idling operation starts, the third preheater roll 36 rotates in the direction shown by the arrow in Fig. 12. However, in a state where no conveying force is imparted to the core raw paper PA1 due to the separation of the pressing roll 110, the core raw paper PA1 is held by the plate-like member 84. As a result, the third preheater roll 36 can rotate for the idling operation while sliding against the core raw paper PA1.

[0084] When the operator presses the idle button 260 again after the idling operation has been performed for the time required for the trial run, the idling operation ends according to the main control process by this second pressing operation. To end the idling operation, the single facer control device 210 sends a stop control command to the drive circuits 280, 290, 300 so that all the preheater rolls, both stage rolls 22, 24, and belt conveyor 14 in the single facer 1 are stopped.

[0085] (Production start control process) The production start control process shown in Fig. 9 is a process executed when starting production for one day, and is started when it is determined in the main control process that a specific start condition has been met. When the operator turns on the control power switch of the single facer control device 210 and then presses the idling button 260 a first time, the single facer control device 210 starts idling operation. The start condition of the production start control process is that the operator presses the idling button 260 a second time, causing the single facer control device 210 to stop idling operation. Each of the processes SA1 to SA8 shown in Fig. 9 is a process executed by the single facer control device 210.

[0086] When the production start control process is started, it is determined whether the operation button 252 has been pressed (SA1). If the operation button 252 has not been pressed (SA1: NO), the determination process SA1 is repeated. If the operation button 252 has been pressed (SA1: YES), process SA2 is executed.

[0087] The lowering solenoid 274D for conveyance is turned on and the on state is maintained (SA2). Specifically, the single facer control device 210 sends an on control command for the lowering solenoid 274D to the solenoid valve drive circuit 270. The solenoid valve drive circuit 270 excites the lowering solenoid 274D of the conveying solenoid valve 274. When the lowering solenoid 274D is turned on, the operating rod 106A of the air cylinder 106 is lowered, and as shown in FIG. 13, the pressing roll 110 presses the corrugated core raw paper PA1 against the outer circumferential surface 36A of the third preheater roll 36. At this point, the third preheater roll 36 is not rotating, so no conveying force is applied to the corrugated core raw paper PA1. In addition, the single facer control device 210 starts a time counting operation in an internal counter at the time when it sends an on control command for the lowering solenoid 274D to the solenoid valve drive circuit 270.

[0088] It is determined whether or not four seconds have elapsed since the point in time when the ON control command for the lowering solenoid 274D was sent to the solenoid valve drive circuit 270 in process SA2 (SA3). If four seconds have not elapsed (SA3: NO), the determination process SA3 is repeated. If four seconds have elapsed (SA3: YES), process SA4 is executed. In this embodiment, the predetermined time of four seconds is set based on the time it takes for the glue roll 50, which has been waiting away from the upper roll 22, to move until it comes into contact with the upper roll 22.

[0089] The lowering solenoid 272D for holding is turned off and the off state is maintained (SA4). Then, the raising solenoid 272U for holding is turned on and the on state is maintained (SA5). Specifically, the single facer control device 210 sends an off control command for the lowering solenoid 274D and an on control command for the raising solenoid 272U to the solenoid valve driving circuit 270. The solenoid valve driving circuit 270 demagnetizes the lowering solenoid 272D of the holding solenoid valve 272 and excites the raising solenoid 272U of the holding solenoid valve 272. By executing the processes SA4 and SA5, the operating rod 82A of the air cylinder 82 rises, and the plate-shaped member 84 separates from the core raw paper PA1 as shown in FIG. Even if the plate-like member 84 separates from the core raw paper PA1, the pressing roll 110 presses the core raw paper PA1 against the outer peripheral surface 36A of the third preheater roll 36, so that the core raw paper PA1 does not slip off the outer peripheral surface 36A.

[0090] In the single facer 1, the single facer control device 210 sends a drive control command to the drive circuits 280, 290, 300 so that the both corrugated rolls 22, 24 and all the preheater rolls rotate and the belt conveyor 14 operates (SA6). The drive control command includes a speed control command that commands the rotation speed of each drive motor, which is determined based on the production speed of the single-faced corrugated cardboard sheet PA3 in each order. By the process SA6, the third preheater roll 36 rotates in the direction shown by the arrow in Fig. 14, so that a conveying force is applied to the core raw paper PA1. By applying this conveying force, the core raw paper PA1 is conveyed in the supply direction DA toward the meshing position P3.

[0091] It is determined whether or not 8 seconds have elapsed since the ON control command for the lowering solenoid 274D was sent to the solenoid valve driving circuit 270 in step SA2 (SA7). If 8 seconds have not elapsed (SA7: NO), the determination step SA7 is repeated. If 8 seconds have elapsed (SA7: YES), step SA8 is executed. The predetermined time of 8 seconds is set based on the time it takes for the leading edge of the core raw paper PA1 to be transported to the meshing position P3 shown in FIG. 13. The time it takes for the leading edge of the core raw paper PA1 to be transported to the meshing position P3 is determined based on the distance between the formation position of the cutting groove 74 in the supply direction DA and the meshing position P3, the rotation speed of the third preheater roll 36, etc.

[0092] The lowering solenoid 274D for conveyance is turned off and the off state is maintained (SA8). Specifically, the single facer control device 210 sends an off control command for the lowering solenoid 274D to the solenoid valve driving circuit 270. The solenoid valve driving circuit 270 demagnetizes the lowering solenoid 274D of the conveying solenoid valve 274. When the lowering solenoid 274D is turned off, the operating rod 106A of the air cylinder 106 rises, and as shown in FIG. 2, the pressing roll 110 separates from the outer peripheral surface 36A of the third preheater roll 36. This separation of the pressing roll 110 prevents the conveying force from being applied to the core raw paper PA1. At the time when the off control command for the lowering solenoid 274D is sent to the solenoid valve driving circuit 270, the leading end portion of the core raw paper PA1 has reached the meshing position P3. Furthermore, when the single facer control device 210 sends an OFF control command for the lowering solenoid 274D to the solenoid valve driving circuit 270, it resets the internal counter and stops the timing operation.

[0093] After process SA8 is executed, the production start control process shown in FIG. 9 ends, and the process returns to the main control process.

[0094] Because the pressure in the internal space of the upper roll 22 is reduced to negative pressure by the operation of the vacuum pump, the core raw paper PA1 is conveyed in a state of being sucked onto the outer circumferential surface of the upper roll 22 from the moment it passes through the meshing position P3. The core raw paper PA1 to which glue has been applied by the glue roll 50 is bonded to the liner raw paper PA2 by the press roll 48.

[0095] (Paper passing control process) The paper passing control process shown in Fig. 10 is a process executed when replacing the corrugated roll cartridge including both corrugated rolls 22, 24, and is started when it is determined in the main control process that a specific start condition is met. After the operator confirms that the "remaining length" of the current order has become "0" on the display screen of the display unit 240, he presses the stop button 254. The start condition of the paper passing control process is that the single facer control device 210 has stopped the rotation of all the rolls of the single facer 1 and the operation of the belt conveyor 14 by pressing the stop button 254. Each of the processes SB1 to SB15 shown in Fig. 10 is a process executed by the single facer control device 210.

[0096] When the paper passing control process is started, it is determined whether the core passing button 256 is pressed (SB1). If the core passing button 256 is not pressed (SB1: NO), the determination process SB1 is repeated. If the core passing button 256 is pressed (SB1: YES), the process SB2 is executed.

[0097] The holding lift solenoid 272U is turned off and the off state is maintained (SB2). Then, the holding lower solenoid 272D is turned on and the on state is maintained (SB3). Specifically, the single facer control device 210 sends an off control command for the lift solenoid 274U and an on control command for the lower solenoid 272D to the solenoid valve drive circuit 270. The solenoid valve drive circuit 270 demagnetizes the lift solenoid 272U of the holding solenoid valve 272 and excites the lower solenoid 272D of the holding solenoid valve 272. By executing the processes SB2 and SB3, the operating rod 82A of the air cylinder 82 is lowered, and the plate-shaped member 84 presses the core raw paper PA1 against the inside of the holding recess 96 to hold it, as shown in FIG. 6.

[0098] In a state where the core raw paper PA1 is held by the plate-like member 84, SS2 An operator working in the cutting section 2 cuts the core raw paper PA1 in the width direction along the cutting groove 74 using a tool such as a cutter.

[0099] It is determined whether the inching button 258 has been pressed (SB4). If the inching button 258 has not been pressed (SB4: NO), the determination process SB4 is repeated. If the operator presses the inching button 258 after cutting the core raw paper PA1, it is determined that the inching button 258 has been pressed (SB4: YES), and process SB5 is executed.

[0100] In the single facer 1, the single facer control device 210 sends a drive control command to the drive circuits 280, 290, 300 so that the both tiered rolls 22, 24 and all the preheater rolls rotate and the belt conveyor 14 operates (SB5). Process SB5 rotates the upper tiered roll 22 and the lower tiered roll 24 in the direction shown by the arrow in Fig. 12, so that the downstream portion of the cut core raw paper PA1, i.e., the downstream portion of the core raw paper PA1 shown by the two-dot chain line in Fig. 12, is transported by the rotation of the both tiered rolls 22, 24.

[0101] Process SB5 causes the third preheater roll 36 to rotate in the direction shown by the arrow in Fig. 12. While process SB5 is being performed, as shown in Fig. 12, the plate-shaped member 84 is located at a holding position where it presses the upstream portion of the cut core raw paper PA1, and the pressing roller 110 is located at a separated position away from the outer circumferential surface 36A of the third preheater roll 36. In a state where no conveying force is applied to the upstream portion of the core raw paper PA1 due to the separation of the pressing roller 110, the core raw paper PA1 is held by the plate-shaped member 84. As a result, the third preheater roll 36 rotates in a state where it slides relative to the core raw paper PA1.

[0102] It is determined whether the inching button 258 has been released (SB6). If the inching button 258 has not been released and remains pressed (SB6: NO), the determination process SB6 is repeated. When the operator releases the inching button 258 from the pressed state after confirming that the downstream portion of the cut core raw paper PA1 has been discharged to the bridge by the belt conveyor 14, it is determined that the inching button 258 has been released (SB6: YES), and process SB7 is executed.

[0103] In the single facer 1, the single facer control device 210 sends a stop control command to the drive circuits 280, 290, 300 so as to stop the rotation of the both rolls 22, 24, the rotation of all the preheater rolls, and the operation of the belt conveyor 14 (SB7). By process SB7, the discharge operation of the downstream side portion of the cut core raw paper PA1 is stopped.

[0104] With all preheater rolls and the like of the single facer 1 stopped, the operator operates an operation button, among the operation means of the operation unit 250, for instructing the movement of the corrugated roll cartridge in order to replace the currently installed corrugated roll cartridge with another corrugated roll cartridge to be used for the next order. In response to the operation of the operation button, the single facer control device 210 sends a drive control command to the corrugated roll cartridge drive circuit. The corrugated roll cartridge drive circuit drives a plurality of drive motors that move the corrugated roll cartridge in the left-right direction and the up-down direction in accordance with the drive control command. The drive motors drive the currently installed corrugated roll cartridge to replace the other corrugated roll cartridge. When the corrugated roll cartridge is replaced, the downstream portion of the cut corrugated core raw paper PA1 is discharged from inside the single facer 1, so that the corrugated roll cartridge can be moved smoothly for replacement without getting caught on the corrugated core raw paper PA1.

[0105] It is determined whether the operation button 252 has been pressed (SB8). If the operation button 252 has not been pressed (SB8: NO), the determination process SB8 is repeated. When the operator presses the operation button 252 after the replacement of the corrugated roll cartridge is completed, it is determined that the operation button 252 has been pressed (SB8: YES), and process SB9 is executed.

[0106] The lowering solenoid 274D for transport is turned on and the on state is maintained (SB9). When the lowering solenoid 274D is turned on, the operating rod 106A of the air cylinder 106 is lowered, and as shown in FIG. 13, the pressing roll 110 presses the core raw paper PA1 against the outer circumferential surface 36A of the third preheater roll 36. At this point, since the third preheater roll 36 is not rotating, no transport force is applied to the core raw paper PA1. When the single facer control device 210 sends an on control command for the lowering solenoid 274D to the solenoid valve drive circuit 270, it causes the internal counter to start counting.

[0107] It is determined (SB10) whether or not four seconds have elapsed since the point in time when the ON control command for the descent solenoid 274D was sent to the solenoid valve drive circuit 270 in process SB9. If four seconds have not elapsed (SB10: NO), the determination process SB10 is repeated. If four seconds have elapsed (SB10: YES), process SB11 is executed.

[0108] The lowering solenoid 272D for holding is turned off and the off state is maintained (SB11). Next, the ascent solenoid 272U for holding is turned on and the on state is maintained (SB12). The operating rod 82A of the air cylinder 82 is raised by processes SA4 and SA5, and the plate-shaped member 84 is separated from the core raw paper PA1, as shown in Fig. 14. Even if the plate-shaped member 84 is separated from the core raw paper PA1, the pressing roll 110 presses the core raw paper PA1 against the outer peripheral surface 36A of the third preheater roll 36, so the core raw paper PA1 does not slip off the outer peripheral surface 36A.

[0109] In the single facer 1, the single facer control device 210 sends a drive control command to the drive circuits 280, 290, 300 so that the both stage rolls 22, 24 and all the preheater rolls rotate and the belt conveyor 14 operates (SB13). Process SB13 rotates the third preheater roll 36 in the direction shown by the arrow in Fig. 14, so that a conveying force is applied to the core raw paper PA1. Due to the application of this conveying force, the core raw paper PA1 is conveyed in the supply direction DA toward the meshing position P3.

[0110] It is determined whether or not 8 seconds have elapsed since the ON control command for the descent solenoid 274D was sent to the solenoid valve drive circuit 270 in process SB9 (SB14). If 8 seconds have not elapsed (SB14: NO), the determination process SB14 is repeated. If 8 seconds have elapsed (SB14: YES), process SB15 is executed.

[0111] The lowering solenoid 274D for conveyance is turned off and the off state is maintained (SB15). When the lowering solenoid 274D is turned off, the operating rod 106A of the air cylinder 106 rises, and the pressing roll 110 separates from the outer peripheral surface 36A of the third preheater roll 36 as shown in FIG. 2. When the pressing roll 110 separates, the conveying force is no longer applied to the corrugated core raw paper PA1. When the off control command for the lowering solenoid 274D is sent to the solenoid valve driving circuit 270, the leading end of the corrugated core raw paper PA1 has reached the meshing position P3. When the off control command for the lowering solenoid 274D is sent to the solenoid valve driving circuit 270, the single facer control device 210 resets the internal counter and stops the timing operation.

[0112] After step SB15 is executed, the paper passing control process shown in FIG. 10 ends, and the process returns to the main control process.

[0113] Because the pressure in the internal space of the upper roll 22 is reduced to negative pressure by the operation of the vacuum pump, the core raw paper PA1 is conveyed in a state of being sucked onto the outer circumferential surface of the upper roll 22 from the moment it passes through the meshing position P3. Then, the core raw paper PA1 is bonded to the liner raw paper PA2 by the press roll 48.

[0114] (End of production control processing) The production end control process shown in Fig. 11 is a process executed when the production of one day is ended, and is started when it is determined in the main control process that a specific start condition is satisfied. After the operator confirms that the "remaining length" of the last order has become "0" on the display screen of the display unit 240, he / she presses the stop button 254. The start condition of the production end control process is that the single facer control device 210 has stopped the rotation of both rolls 22, 24, the rotation of all preheater rolls, and the operation of the belt conveyor 14 in the single facer 1 by pressing the stop button 254. Each process from SC1 to SC7 shown in Fig. 11 is a process executed by the single facer control device 210.

[0115] When the production end control process is started, it is determined whether the core-passing button 256 is pressed (SC1). If the core-passing button 256 is not pressed (SC1: NO), the determination process SC1 is repeated. If the core-passing button 256 is pressed (SC1: YES), the process SC2 is executed.

[0116] The holding up solenoid 272U is turned off and the off state is maintained (SC2). Next, the holding down solenoid 272D is turned on and the on state is maintained (SC3). By the processes SC2 and SC3, the operating rod 82A of the air cylinder 82 is lowered, and the plate-like member 84 presses the core raw paper PA1 against the inside of the holding recess 96 and holds it, as shown in FIG. 6.

[0117] In a state where the core raw paper PA1 is held by the plate-like member 84, SS2 An operator working in the cutting section 2 cuts the core raw paper PA1 in the width direction along the cutting groove 74 using a tool such as a cutter.

[0118] It is determined whether the inching button 258 has been pressed (SC4). If the inching button 258 has not been pressed (SC4: NO), the determination process SC4 is repeated. If the operator presses the inching button 258 after cutting the core raw paper PA1, it is determined that the inching button 258 has been pressed (SC4: YES), and process SC5 is executed.

[0119] In the single facer 1, the single facer control device 210 sends a drive control command to the drive circuits 280, 290, 300 so that the both tiered rolls 22, 24 and all the preheater rolls rotate and the belt conveyor 14 operates (SC5). Process SC5 causes the upper tiered roll 22 and the lower tiered roll 24 to rotate in the direction shown by the arrow in Fig. 12, so that the downstream portion of the cut core raw paper PA1, i.e., the downstream portion of the core raw paper PA1 shown by the two-dot chain line in Fig. 12, is transported by the rotation of the both tiered rolls 22, 24.

[0120] Process SC5 causes the third preheater roll 36 to rotate in the direction shown by the arrow in Fig. 12. While process SC5 is being performed, as shown in Fig. 12, the plate-shaped member 84 is located at a holding position where it presses the upstream portion of the cut core raw paper PA1, and the pressing roller 110 is located at a separated position away from the outer circumferential surface 36A of the third preheater roll 36. In a state where no conveying force is applied to the upstream portion of the core raw paper PA1 due to the separation of the pressing roller 110, the core raw paper PA1 is held by the plate-shaped member 84. As a result, the third preheater roll 36 rotates in a state where it slides relative to the core raw paper PA1.

[0121] It is determined whether the inching button 258 has been released (SC6). If the inching button 258 has not been released and remains pressed (SC6: NO), the determination process SC6 is repeated. When the operator releases the inching button 258 from the pressed state after confirming that the downstream portion of the cut core raw paper PA1 has been discharged to the bridge by the belt conveyor 14, it is determined that the inching button 258 has been released (SC6: YES), and process SC7 is executed.

[0122] In the single facer 1, the single facer control device 210 sends a stop control command to the drive circuits 280, 290, 300 so as to stop the rotation of the both rolls 22, 24, the rotation of all the preheater rolls, and the operation of the belt conveyor 14 (SC7). By the process SC7, the discharge operation of the downstream side portion of the cut core raw paper PA1 is stopped.

[0123] After process SC7 is executed, the production end control process shown in Fig. 11 ends, and the process returns to the main control process. To end the main control process, the operator turns off the control power switch of the single facer 1. Turning off the control power switch stops the power supply to the components of the single facer 1. At the end of production for the day, the main power switch of the corrugator is also turned off.

[0124] [Effects of the embodiment] In this embodiment, a series of operations, including holding the core raw paper PA1 by the raw paper holding mechanism 3, releasing the holding, and applying a conveying force to the core raw paper PA1 by the conveying force applying mechanism 5, are automatically performed by processes SB2, SB3, SB9, SB11, SB12, and SB15 of the paper passing control process shown in Fig. 10, without the operator having to handle the core raw paper PA1. This automatic execution makes it possible to efficiently produce single-faced corrugated cardboard sheets PA3 even in high-mix low-volume production where frequent replacement of the double corrugated rolls 22, 24 is required.

[0125] In this embodiment, the conveying force imparting mechanism 5 is configured to press the pressing roll 110 against the outer peripheral surface 36A of the third preheater roll 36, thereby imparting the rotational force of the third preheater roll 36 as a conveying force to the core raw paper PA1 wound around the outer peripheral surface 36A. With this configuration, the conveying force imparting mechanism 5 does not require a special driving means for generating a conveying force, and therefore has a simple configuration.

[0126] In this embodiment, the conveying force imparting mechanism 5 is disposed upstream of the discharge position PA2 in the supply direction DA at a position where the angle θ is smaller than 45 degrees, as shown in Fig. 4. With this arrangement, the horizontal component of the rotational force of the third preheater roll 36 at the contact position P1 becomes larger than the vertical component of the rotational force of the third preheater roll 36, and this horizontal component is imparted to the core raw paper PA1 as a conveying force. As a result, the rotational force of the third preheater roll 36 can be efficiently used to impart a larger conveying force to the core raw paper PA1.

[0127] In this embodiment, the core raw paper PA1 is supplied from the core splicer 10 to the meshing position P3 of the two stage rolls 22, 24 by the first to third preheater rolls 30, 32, 36, which are disposed in the path for supplying the core raw paper PA1 from the core splicer 10 to the meshing position P3 of the two stage rolls 22, 24. This arrangement allows the core raw paper PA1, which has been released from the holding by the plate-like member 84, to be supplied quickly and easily to the meshing position P3, without any manual handling of the core raw paper PA1 by the operator.

[0128] In this embodiment, the stencil paper holding mechanism 3 is disposed at a position downstream of the discharge position P2 in the supply direction DA and closer to the discharge position P2 than the meshing position P3 of the corrugated rolls 22, 24. This arrangement allows the stencil paper holding mechanism 3 to be disposed at a position where replacement of the corrugated roll cartridge including the corrugated rolls 22, 24 is not hindered.

[0129] In this embodiment, the lower surface of the elastic presser 90 of the plate-like member 84 is disposed in a range downstream of the discharge position P2 in the supply direction DA, within a distance of half the diameter of the third preheater roll 36. This arrangement allows the lower surface of the elastic presser 90 to press and hold the core raw paper PA1 that has been sent out from the discharge position P2 and is not restrained, at a position as close to the discharge position P2 as possible. As a result, the core raw paper PA1 can be held in a constant posture with little positional deviation.

[0130] In this embodiment, the plate-like member 84 includes an elastic presser 90. A holding recess 96 is formed on the upper surface 64A of the first guide 64. As shown in Fig. 6(B) , when the elastic presser 90 of the plate-like member 84 presses and holds the core raw paper PA1, the elastic presser 90 presses the core raw paper PA1 into the holding recess 96, thereby holding the core raw paper PA1 in a slightly bent state. Due to the configuration in which the core raw paper PA1 is held between the elastic presser 90 and the holding recess 96, the core raw paper PA1 can be reliably held even if the plate-like member 84 has small dimensions in the left-right direction and the front-rear direction.

[0131] 2, in this embodiment, the stencil paper holding mechanism 3 is disposed upstream of the steam chamber 62 in the supply direction DA. This arrangement allows the plate-like member 84 of the stencil paper holding mechanism 3 to stably hold the portion of the core raw paper PA1 that is less exposed to the steam sent out from the steam chamber 62, i.e., the portion with less moisture. It also makes it possible to reduce the influence of the steam on the stencil paper holding mechanism 3, such as the generation of rust.

[0132] In this embodiment, the total weight of the plate-shaped member 84, the two lifting guide shafts 86A and 86B, and the operating rod 82A is set so that the total weight of the plate-shaped member 84, the two lifting guide shafts 86A and 86B, and the operating rod 82A is sufficiently smaller than the sliding resistance of the air cylinder 82. Even if a malfunction occurs during production of the single-faced cardboard sheet PA3, such as when the power supply to the holding solenoid valve 272 that operates the air cylinder 82 is mistakenly stopped, the plate-shaped member 84 located at the release position is maintained at the release position by the sliding resistance of the air cylinder 82 due to the setting of the weight of the plate-shaped member 84, etc. As a result, it is possible to reduce the plate-shaped member 84 from falling toward the core raw paper PA1 being supplied on the conveying path 60. In addition, when the compression pump that supplies compressed air to the air cylinder 82 is stopped at the end of the day's production of the single-faced cardboard sheet PA3, the compressed air inside the air cylinder 82 gradually leaks out and is released to the outside. The plate-shaped member 84, which is located in the holding position when production of the single-sided cardboard sheet PA3 is completed, is maintained in the holding position by the gravity of the plate-shaped member 84 and the sliding resistance of the air cylinder 82, and can continue to hold the core raw paper PA1 in cooperation with the holding recess 96.

[0133] In this embodiment, when the production of the single-faced cardboard sheet PA3 for one day is finished, as shown in FIG. 12, the plate-shaped member 84 cooperates with the holding recess 96 to hold the core raw paper PA1, and the pressing roll 110 moves away from the outer circumferential surface 36A of the third preheater roll 36. When the production of the single-faced cardboard sheet PA3 for one day is resumed the next day, an idling operation is performed before the start of the main production. In the idling operation, many preheater rolls including the third preheater roll 36 are rotated. During the idling operation, the third preheater roll 36 rotates with the core raw paper PA1 wrapped around its outer circumferential surface 36A, but since the pressing roll 110 is separated from the outer circumferential surface 36A, no conveying force is applied to the core raw paper PA1. Furthermore, since the plate-shaped member 84 holds the core raw paper PA1 at a position downstream of the discharge position P2, the plate-shaped member 84 can securely hold the core raw paper PA1 even when the third preheater roll 36 is rotated during idling operation.

[0134] In this embodiment, as shown in Fig. 2, the conveying path 60 is formed to extend horizontally and substantially linearly from the uppermost portion of the outer peripheral surface 36A of the third preheater roll 36 to the uppermost portion of the outer peripheral surface 24A of the lower roll 24. The plate-shaped member 84 holds the core raw paper PA1 present on the conveying path 60. The pressing roll 110 applies a conveying force to the core raw paper PA1 wound around the outer peripheral surface 36A of the third preheater roll 36 at a position close to the discharge position P2. Since the conveying path 60 extends horizontally and substantially linearly, the core raw paper PA1 released from the holding by the plate-shaped member 84 can be reliably supplied to the meshing position P3 of the both rolls 22, 24 by only the conveying force applied by the pressing roll 110.

[0135] In this embodiment, as shown in FIG. 3, the base paper holding mechanism 3 and the conveying force imparting mechanism 5 are arranged so that the center position of each mechanism in the front-rear direction is located on an extension line CL1 that passes through the center position in the width direction of the core raw paper PA1. With this arrangement, the plate-shaped member 84 presses and holds the center position in the width direction of the core raw paper PA1. The pressing roll 110 imparts a conveying force to the center position in the width direction of the core raw paper PA1 that has been released from the holding by the plate-shaped member 84. As a result, even if the dimension of the plate-shaped member 84 in the front-rear direction is relatively small, the plate-shaped member 84 can hold the core raw paper PA1 while suppressing the positional deviation in the left-right direction of the core raw paper PA1 over the entire width direction portion of the core raw paper PA1. Furthermore, even if the dimension of the pressing roll 110 in the front-rear direction is relatively small, the pressing roll 110 can accurately move the entire width direction portion of the core raw paper PA1 in the supply direction DA.

[0136] In this embodiment, in the production start control process shown in Fig. 9, after the pressing roll 110 of the conveying force imparting mechanism 5 is displaced from the separated position to the pressing position, the plate-shaped member 84 of the stencil paper holding mechanism 3 is displaced from the holding position to the release position. With this configuration, when the plate-shaped member 84 releases the holding of the core raw paper PA1, the pressing roll 110 holds the core raw paper PA1 between itself and the outer peripheral surface 36A of the third preheater roll 36, so that the core raw paper PA1 can be prevented from moving in a direction to fall from the outer peripheral surface 36A before the third preheater roll 36 rotates. Also, the pressing roll 110 can reliably impart a conveying force to the core raw paper PA1 from the beginning when the third preheater roll 36 starts to rotate.

[0137] In this embodiment, the transport solenoid valve 274 has a configuration in which a built-in spring switches the port so that the pressing roll 110 is displaced to the separated position when the lowering solenoid 274D is turned off. After the application of the transport force to the core raw paper PA1 is terminated by turning off the lowering solenoid 274D, the port is switched by the built-in spring of the transport solenoid valve 274, and the pressing roll 110 is displaced to the separated position and maintained at the separated position, so that the pressing roll 110 does not interfere with the transport of the core raw paper PA1 that is wound around the outer circumferential surface 36A of the third preheater roll 36 and supplied.

[0138] In this embodiment, the weight of the pressing roll 106 is set in consideration of the diameter and the width L5 in the front-rear direction of the pressing roll 106 so that approximately half the total weight of the pressing roll 110, the arm plate parts 126, 128, the rod bearing part 134, the connecting shafts 132, 136, and the operating rod 106A is sufficiently smaller than the sliding resistance of the air cylinder 106. When the compression pump that supplies compressed air to the air cylinder 106 is stopped at the end of the day's production of the single-faced cardboard sheet PA3, the compressed air inside the air cylinder 106 gradually leaks out and is released. The pressing roll 110, which is located at the separated position when the production of the single-faced cardboard sheet PA3 is completed, is maintained at the separated position by the sliding resistance of the air cylinder 82, so that it is possible to prevent the pressing roll 110 from accidentally displacing to the pressing position and applying a conveying force to the core raw paper PA1 when idling operation is started before the actual production on the next day.

[0139] <Configuration Correspondence> The single facer 1 is an example of a single facer of the present invention. The combination of the base paper holding mechanism 3, the conveying force imparting mechanism 5, and the control function of the single facer 1 that controls the operation of both mechanisms 3 and 5 is an example of a core base paper automatic feeder of the present invention. The upper and lower corrugated rolls 22 and 24, and the corrugated roll cartridge including both corrugated rolls 22 and 24 are an example of the upper and lower corrugated rolls and corrugated roll assembly of the present invention. The third preheater roll 36 is an example of a preheater roll of the present invention. The conveying path 60 along which the core base paper PA1 is conveyed to the meshing position P3 between the upper and lower corrugated rolls 22 and 24, and the conveying surface of the conveying path 60 are an example of the conveying path and the conveying surface of the conveying path of the present invention. The supply direction DA is an example of a predetermined conveying direction of the present invention. The meshing position P3 between the upper and lower corrugated rolls 22 and 24 is an example of the meshing position of the present invention. Discharge position P2is an example of a discharge position on the conveying path of the present invention. The combination of the plate-shaped member 84 and the lifting guide shafts 86A and 86B is an example of a base paper holding member of the present invention. The plate-shaped member 84 is an example of a plate-shaped member of the present invention. The lower surface of the elastic presser 90 of the plate-shaped member 84 is an example of a pressing surface of the plate-shaped member of the present invention. The combination of the air cylinder 82 and the solenoid valve 272 is an example of a first driving means of the present invention and an example of an elevation driving section. The operating rod 82A of the air cylinder 82 is an example of an operating member of the present invention. The combination of the connecting arm mechanism 108 and the pressing roll 110 is an example of a conveying force imparting member of the present invention. The pressing roll 110 is an example of a pressing roll of the present invention. The combination of the air cylinder 106 and the solenoid valve 274 is an example of a second driving means of the present invention. The single facer control device 210 is an example of a control means of the present invention. The combination of the single facer control device 210, the processes SA2, SA5, SB11, SB12, and the processes SB2, SB3, SC2, and SC3 is an example of the first control process of the present invention. The combination of the single facer control device 210, the processes SA4, SA8, and the processes SB9 and SB15 is an example of the second control process of the present invention. In FIG. 6(A), the position where the elastic presser 90 of the plate-shaped member 84 presses and holds the core raw paper PA1 is an example of the holding position of the raw paper holding member of the present invention. In FIG. 4, the position where the elastic presser 90 of the plate-shaped member 84 moves upward from the holding recess 96 is an example of the release position of the raw paper holding member of the present invention. In FIG. 4, the position where the pressing roll 110 shown by the two-dot chain line presses the core raw paper PA1 toward the outer circumferential surface 36A of the third preheater roll 36 is an example of the pressing position of the conveying force imparting member of the present invention. The position where the pressing roll 110 shown by the solid line in Fig. 4 is separated from the outer peripheral surface 36A of the third preheater roll 36 is an example of the separation position of the conveying force imparting member of the present invention. The cutting groove 74 is an example of a cutting member of the present invention. The steam chamber 62 is an example of a steam delivery device of the present invention. The arrangement area of ​​the upper surface 62A of the steam chamber 62 is an example of a steam delivery area of ​​the present invention. The right end of the upper surface 62A of the steam chamber 62 in Fig. 4 is an example of an upstream end of the steam delivery area. The corrugated roll drive motor 292 and the preheater drive motor group 282 are an example of a third drive means of the present invention.The combination of the single facer control device 210 and processes SA6 and SB13 is an example of the third control process of the present invention. Processes SB2, SB3, SC2, and SC3 are examples of the holding process of the present invention. The process in which the operator cuts the core raw paper PA1 along the cutting groove 74 after processes SB7 and SC7 is an example of the cutting process of the present invention. Processes SA4, SA5, SB11, and SB12 are examples of the release process of the present invention. Processes SA2, SA8, SB9, and SB15 are examples of the conveying force applying process of the present invention.

[0140] <Modification> The present invention is not limited to the present embodiment, and various modifications are possible without departing from the spirit and scope of the present invention. An example of such a modification will be described below.

[0141] (1) In this embodiment, the combination of the plate-shaped member 84 and the pair of lifting guide shafts 86A, 86B is configured as the stencil paper holding member, but is not limited to this configuration. As long as the lower surface of the elastic presser body 90 of the plate-shaped member 84 is configured to lift and lower while maintaining a horizontal position facing the holding recess 96, for example, both lifting guide shafts 86A, 86B may be fixed to the cylinder case of the air cylinder 82, and guide holes may be formed in the plate-shaped member 84. In this modified example, a plate-shaped member having guide holes is configured as the stencil paper holding member.

[0142] (2) In this embodiment, the combination of the connecting arm mechanism 108 and the pressing roll 110 is configured as a conveying force imparting member, but is not limited to this configuration. As long as the pressing roll 110 is configured to be displaced to either the pressing position or the separated position with respect to the outer circumferential surface 36A of the third preheater roll 36, for example, the pressing roll 110 may be configured to be directly supported by the connecting shaft 136 inserted into the rod bearing portion 134. In this modified example, the air cylinder 106 is configured to be fixed to the support block 104 so that the operating rod 106A of the air cylinder 106 approaches or separates from the outer circumferential surface 36A of the third preheater roll 36 in a state where the operating rod 106A is located on an extension line passing through the rotation center of the third preheater roll 36, for example, on an extension line CL4. In the configuration of this modified example, the pressing roll directly supported by the rod bearing portion is configured as a conveying force imparting member.

[0143] (3) In this embodiment, the stencil paper holding mechanism 3 is arranged close to the third preheater roll 36 that is arranged at a position closest to the meshing position P3 of the corrugated rolls 22, 24, but is not limited to this configuration. If it is possible to reduce the operator's work of passing the core raw paper PA1 through a roll such as a preheater roll after replacing the corrugated rolls 22, 24 or after starting production on the next day, the stencil paper holding mechanism 3 may be arranged at a position downstream of the second preheater roll 32 and close to the second preheater roll 32. In this modified example, a configuration may be considered in which a guide means is provided to guide the core raw paper PA1 released from the hold by the plate-like member 84 from the second preheater roll 32 toward the wrap roll 34 and the third preheater roll 36.

[0144] (4) In this embodiment, the conveying force imparting mechanism 5 includes a pressing roll 110 to impart the rotational force of the third preheater roll 36 to the core raw paper PA1 as a conveying force. The pressing roll 110 is displaced to either a pressing position or a separated position with respect to the outer circumferential surface 36A of the third preheater roll 36, but is not limited to this configuration. For example, the conveying force imparting mechanism may be arranged between the discharge position P2 and the arrangement position of the cutting groove 74 and include a pair of conveying rollers that are rotated by a driving means. In this modification, the core raw paper PA1 is sandwiched between the two conveying rollers and conveyed toward the meshing position P3 of the two corrugated rolls 22 and 24. The conveying force imparting mechanism of the modification may be arranged on either the upstream side or the downstream side of the base paper holding mechanism in the supply direction DA. In addition, in the modified example, both conveying rollers may be configured to move to positions spaced apart from each other during conveying stop periods other than the period when the core raw paper PA1 is being conveyed, or may be maintained in a position to clamp the core raw paper PA1 during conveying stop periods, i.e., a position to hold the core raw paper PA1 so that it does not move in the supply direction DA.

[0145] (5) In this embodiment, the core raw paper PA1 is sandwiched and held between the lower surface of the elastic pressing body 90 of the plate-shaped member 84 and the bottom surface of the holding recess 96 by the pressing force of the air cylinder 82, but is not limited to this configuration. For example, a known toggle clamp described in JP 2017-13814 A may be configured to hold the central portion in the width direction of the core raw paper PA1 or each side end of both side ends of the core raw paper PA1 extending in the supply direction DA. In this modified example, a lever that switches the toggle clamp between a holding position and a release position is moved by an actuator such as a solenoid.

[0146] (6) In this embodiment, the lower surface of the elastic pressing body 90 of the plate-like member 84 and the bottom surface of the holding recess 96 are formed by flat surfaces, but are not limited to this flat surface. At least one of the lower surface of the elastic pressing body 90 and the bottom surface of the holding recess 96 may be formed into a shape having multiple protrusions as long as it is possible to generate contact resistance that suppresses movement of the core raw paper PA1 in the supply direction DA.

[0147] (7) In the present embodiment, the holding recess 96 is formed on the upper surface 64A of the first guide 64, but the present invention is not limited to this configuration. For example, the upper surface 64A of the first guide 64 may be formed of a flat surface without providing the holding recess 96. In this modification, the material of the elastic pressing body 90 is determined so that the lower surface of the elastic pressing body 90 of the plate-like member 84 has a large contact resistance, or the shape of the lower surface of the elastic pressing body 90, such as a shape having many protrusions, is determined.

[0148] (8) In the present embodiment, the pressing roll 110 of the conveying force imparting mechanism 5 is displaced from the separated position to the pressing position when the operator presses the operation button 252, and displaced from the pressing position to the separated position when a predetermined time has elapsed since the pressing operation of the operation button 252, but is not limited to this configuration. For example, if a detection means for detecting that the cut end portion of the core raw paper PA1 has reached the meshing position P3 of the two corrugated rolls 22 and 24 is provided, the pressing roll 110 may be displaced from the pressing position to the separated position when the detection means detects the arrival of the end portion. Also, if a measurement means for measuring the length of the core raw paper PA1 supplied in the supply direction DA is provided, the pressing roll 110 may be displaced from the pressing position to the separated position when the length measured by the measurement means coincides with the length corresponding to the distance between the arrangement position of the cutting groove 74 and the meshing position P3.

[0149] (9) In this embodiment, the pressing roll 110 of the conveying force imparting mechanism 5 is configured to be displaced from the separated position to the pressing position when the operator presses the operation button 252, and displaced from the pressing position to the separated position when a predetermined time of 8 seconds has elapsed since the operation button 252 was pressed. The predetermined time is set to a certain time from the time the operation button 252 was pressed, but is not limited to this predetermined time setting. For example, when the rotation speed of the third preheater roll 36 changes, the calculation means may calculate the time from the time the third preheater roll 36 starts rotating to the time the cut end portion of the core raw paper PA1 reaches the meshing position P3 based on the actual rotation speed of the third preheater roll 36 and the distance between the arrangement position of the cutting groove 74 and the meshing position P3. In this modified example, the pressing roll 110 is configured to be displaced from the pressing position to the separated position when the time calculated by the calculation means has elapsed since the third preheater roll 36 starts rotating.

[0150] (10) In this embodiment, the single facer 1 is configured to include a base paper holding mechanism 3, a conveying force imparting mechanism 5, a control function for controlling the operation of both mechanisms 3 and 5, and a control function for controlling the dynamics of the entire single facer 1, but is not limited to this configuration. For example, the core base paper automatic feeder may be configured as a device separate from the single facer and include a base paper holding mechanism, a conveying force imparting mechanism, and a control unit for controlling the operation of both mechanisms. In this modified example, the base paper holding mechanism and the conveying force imparting mechanism are additionally equipped on an existing single facer, and the control unit for controlling the operation of both mechanisms controls both mechanisms based on information indicating the operating state of the single facer.

[0151] (11) In this embodiment, the core raw paper automatic feeding method includes a holding step of holding the core raw paper PA1, a cutting step of cutting the core raw paper PA1 into an upstream core raw paper portion and a downstream core raw paper portion, an exchanging step of exchanging a corrugated roll cartridge including both corrugated rolls 22, 24, a releasing step of releasing the holding of the upstream core raw paper portion, and a conveying force applying step of applying a conveying force to the upstream core raw paper portion. In this embodiment, the single facer 1 automatically and sequentially executes the holding step, the releasing step, and the conveying force applying step, while the operator manually executes the cutting step, and then the operator inputs a series of instructions for replacing the corrugated roll cartridge into the single facer 1 to cause the single facer 1 to execute the replacing step, but is not limited to this configuration. For example, if the single facer is equipped with a device that automatically cuts the core raw paper PA1 and a device that automatically replaces the corrugated roll cartridge, the single facer may be configured to automatically sequentially perform a holding process, a cutting process, a replacement process, a release process, and a conveying force application process.

[0152] (12) In this embodiment, as shown in Fig. 9 and Fig. 10, the lowering solenoid 274D for conveyance is turned on by processes SA2 to SA6 and SB9 to SB13, and as shown in Fig. 13, the pressing roll 110 is displaced from the separated position to the pressing position, and presses the core raw paper PA1 against the outer circumferential surface 36A of the third preheater roll 36. At this time, the plate-shaped member 84 is located at the holding position for holding the core raw paper PA1, and the third preheater roll 36 is not rotating, so the pressing roll 110 is located in a state in which it is possible to apply a conveying force to the core raw paper PA1. After the plate-shaped member 84 is displaced from the holding position to the release position, the third preheater roll 36 rotates in the direction shown by the arrow in Fig. 14 by processes SA6 and SB13, so the pressing roll 110 is located in a state in which it actually applies a conveying force to the core raw paper PA1. In the present embodiment, the operation of displacing the pressing roll 110 from the separated position to the pressing position is executed before the operation of displacing the plate-shaped member 84 from the holding position to the release position, but the present invention is not limited to this configuration. For example, the operation of displacing the plate-shaped member 84 from the holding position to the release position is executed first, and then the operation of displacing the pressing roll 110 from the separated position to the pressing position is executed in order to apply the conveying force to the core raw paper PA1. Following the displacement of the pressing roll 110, the third preheater roll 36 may start rotating in order to actually apply the conveying force to the core raw paper PA1. Alternatively, the operation of displacing the plate-shaped member 84 from the holding position to the release position is executed first, and then the third preheater roll 36 starts rotating. Following this start of rotation, the operation of displacing the pressing roll 110 from the separated position to the pressing position in order to actually apply the conveying force to the core raw paper PA1 may be executed. [Explanation of symbols]

[0153] 1 Single Facer 3 Paper holding mechanism 5. Conveying force imparting mechanism 22 Upper Roll 24 Lower Roll 36 3rd preheater roll 36A: Outer circumferential surface of the third preheater roll 36 60 Transport Route 62 Steam Chamber 70 Drive motor of third preheater roll 36 74 Cutting groove 82 Air Cylinder 82A Actuating rod 84 Plate-shaped members 90 Elastic presser 106 Air Cylinder 106A Actuating rod 110 Press roll 210 Single facer control device 282 Preheater drive motor group 290-stage roll drive motor PA1 Core base paper DA Supply Direction P2 Unloading position P3 Engagement position

Claims

1. A single facer including an upper roll and a lower roll which mesh with each other to form the core raw paper into a corrugated shape, a rotatable preheater roll which heats the core raw paper, and a transport path formed so that the core raw paper is transported in a predetermined transport direction via the outer circumferential surface of the preheater roll to a position where the upper roll and the lower roll mesh, a paper holding member that is disposed on the conveying path between an unloading position on the conveying path where the core raw paper is conveyed in a predetermined conveying direction away from the outer circumferential surface of the preheater roll toward the meshing position and the meshing position, and that is displaceable to either a holding position that holds the core raw paper within the conveying path in the predetermined conveying direction or a release position that releases the hold; a first driving means for displacing the stencil paper holding member; a conveying force imparting member operable to impart a conveying force to the core raw paper toward the meshing position; A second driving means for actuating the conveying force imparting member; A control means for controlling the first driving means and the second driving means, The control means includes: a first control process for controlling a first driving means so that when the single facer starts a corrugation forming operation for forming the core raw paper into a corrugated shape, the raw paper holding member is displaced from a holding position to a release position, and when the single facer stops the corrugation forming operation, the raw paper holding member is displaced from the release position to the holding position; a second control process for controlling the second driving means so that the conveying force imparting member imparts a conveying force to the core raw paper in a state in which the core raw paper holding member is displaced from the holding position to the release position and then located at the release position, in order to convey the core raw paper to the meshing position; The first control process is a core raw paper automatic paper feed device that controls a first drive means so that when the single facer stops the step forming operation, the core raw paper holding member displaces from a release position to a holding position to hold the upstream core raw paper portion and the downstream core raw paper portion where the core raw paper present on the conveying path to the engagement position via the outer circumferential surface of the preheater roll is cut in a predetermined conveying direction, and controls the first drive means so that the core raw paper holding member is maintained in the holding position until the single facer starts the step forming operation.

2. The single facer includes a cutting member disposed on the conveying path in order to cut the core raw paper present between the discharge position and the meshing position on the conveying path; 2. The automatic core raw paper feeder according to claim 1, wherein the raw paper holding member is disposed upstream of the cutting member in the predetermined conveying direction.

3. The single facer includes a steam delivery device having a steam delivery area for delivering steam toward a core raw paper present between a discharge position and an engagement position on a conveying path, the steam delivery area being disposed along the conveying path; 3. The automatic corrugation medium raw paper feeder according to claim 2, wherein the raw paper holding member is disposed at a position upstream of an upstream end of the steam delivery area of ​​the steam delivery device in the predetermined transport direction.

4. A single facer comprising an upper roll and a lower roll which mesh with each other to form the core paper into a stepped shape, a rotatable preheater roll which heats the core paper, and a transport path formed so that the core paper is transported in a predetermined transport direction via the outer peripheral surface of the preheater roll to a position where the upper roll and the lower roll mesh, a paper holding member that is disposed on the conveying path between an unloading position on the conveying path where the core raw paper is conveyed in a predetermined conveying direction away from the outer circumferential surface of the preheater roll toward the meshing position and the meshing position, and that is displaceable to either a holding position that holds the core raw paper within the conveying path in the predetermined conveying direction or a release position that releases the hold; a first driving means for displacing the stencil paper holding member; a conveying force imparting member operable to impart a conveying force to the core raw paper toward the meshing position; A second driving means for actuating the conveying force imparting member; A control means for controlling the first driving means and the second driving means, The control means includes: a first control process for controlling a first driving means so that when the single facer starts a corrugation forming operation for forming the core raw paper into a corrugated shape, the raw paper holding member is displaced from a holding position to a release position, and when the single facer stops the corrugation forming operation, the raw paper holding member is displaced from the release position to the holding position; a second control process for controlling the second driving means so that the conveying force imparting member imparts a conveying force to the core raw paper in a state in which the core raw paper holding member is displaced from the holding position to the release position and then located at the release position, in order to convey the core raw paper to the meshing position; the conveying force imparting member is operable to come into contact with a central portion of the core raw paper in a paper width direction perpendicular to the predetermined conveying direction in order to impart a conveying force to the core raw paper; the stencil sheet holding member includes a plate-like member that is arranged so as to be movable toward and away from the conveying surface of the conveying path; the plate-like member has a pressing surface that contacts a central portion of the core raw paper in order to press and hold the core raw paper; A core raw paper automatic feeder in which the dimension of the pressing surface in the paper width direction is set to be smaller than the dimension in the direction of the rotation axis of the preheater roll.

5. the first driving means includes a lifting / lowering drive unit for lifting and lowering the plate-like member relative to the conveying surface, and an operating member that moves relative to the lifting / lowering drive unit when the lifting / lowering drive unit is driven, the operating member being connected to the plate-like member; 5. The automatic core raw paper feeder according to claim 4, wherein the plate-like member is constructed so as to have a weight smaller than a movement resistance force constantly acting on the operating member when the operating member moves relative to the lifting drive portion.

6. 6. The automatic core raw paper feeder according to claim 1, wherein the transport force imparting member is disposed upstream of the raw paper holding member in the predetermined transport direction.

7. A single facer comprising an upper roll and a lower roll which mesh with each other to form the core paper into a stepped shape, a rotatable preheater roll which heats the core paper, and a transport path formed so that the core paper is transported in a predetermined transport direction via the outer peripheral surface of the preheater roll to a position where the upper roll and the lower roll mesh, a paper holding member that is disposed on the conveying path between an unloading position on the conveying path where the core raw paper is conveyed in a predetermined conveying direction away from the outer circumferential surface of the preheater roll toward the meshing position and the meshing position, and that is displaceable to either a holding position that holds the core raw paper within the conveying path in the predetermined conveying direction or a release position that releases the hold; a first driving means for displacing the stencil paper holding member; a conveying force imparting member operable to impart a conveying force to the core raw paper toward the meshing position; A second driving means for actuating the conveying force imparting member; A control means for controlling the first driving means and the second driving means, The control means includes: a first control process for controlling a first driving means so that when the single facer starts a corrugation forming operation for forming the core raw paper into a corrugated shape, the raw paper holding member is displaced from a holding position to a release position, and when the single facer stops the corrugation forming operation, the raw paper holding member is displaced from the release position to the holding position; a second control process for controlling the second driving means so that the conveying force imparting member imparts a conveying force to the core raw paper in a state in which the core raw paper holding member is displaced from the holding position to the release position and then located at the release position, in order to convey the core raw paper to the meshing position; the conveying force imparting member is disposed displaceably between a pressing position where the core raw paper is pressed against the outer peripheral surface of the preheater roll and a spaced position where the core raw paper is spaced from the outer peripheral surface of the preheater roll, and includes a rotatable pressing roll; The second driving means displaces the pressing roll to either the pressing position or the separating position, The second control process is a core raw paper automatic paper feed device that controls a second drive means so that the pressing roll is displaced from a separated position to a pressing position so that the conveying force applying member applies a conveying force to the core raw paper when the raw paper holding member is located in a release position.

8. The core raw paper automatic feeder according to claim 7, wherein the second control process controls the second drive means so that the pressing roll is displaced from the pressing position to the separating position when a predetermined time has elapsed since the pressing roll is displaced from the separating position to the pressing position.

9. The heating apparatus further includes a third driving means for rotating the upper roll, the lower roll, and the preheater roll, The control means executes a third control process for controlling the third drive means; The second control process controls the second driving means so that the pressing roll is displaced from the separated position to the pressing position before the stencil paper holding member is displaced from the holding position to the release position when the single facer starts a corrugated forming operation for forming the corrugated shape of the core stencil paper, 9. The core raw paper automatic feeder according to claim 7, wherein the third control process controls the third driving means so that the preheater roll rotates after the raw paper holding member is displaced from the holding position to the release position.

10. a corrugated roll assembly including an upper corrugated roll and a lower corrugated roll which are engaged with each other to form a corrugated shape of a core raw paper, the corrugated roll assembly having a structure which can be replaced with another corrugated roll assembly; a rotatable preheater roll which heats the core raw paper; a transport path formed so that the core raw paper is transported in a predetermined transport direction via the outer peripheral surface of the preheater roll to an engagement position between the upper corrugated roll and the lower corrugated roll; and a cutting member which is disposed on the transport path between an exit position on the transport path where the core raw paper is transported in the predetermined transport direction away from the outer peripheral surface of the preheater roll toward the engagement position in order to cut the core raw paper present on the transport path before the exchange of the corrugated roll assembly, a core paper holding member that is disposed on the conveying path between the discharge position and the engagement position on the conveying path and that is disposed at a position upstream of the position of the cutting member in the predetermined conveying direction, the core paper holding member being displaceable to either a holding position that holds the core paper within the conveying path in the predetermined conveying direction or a release position that releases the hold; a first driving means for displacing the stencil paper holding member; a conveying force imparting member that is arranged at a position upstream of the position of the stencil paper holding member in a predetermined conveying direction and is operable to impart a conveying force to the core stencil paper toward the meshing position; A second driving means for actuating the conveying force imparting member; and a control means for controlling the first driving means and the second driving means. The control means includes: a first control process for controlling a first driving means so that when the single facer starts a corrugation forming operation for forming the core raw paper into a corrugated shape, the raw paper holding member is displaced from a holding position to a release position, and when the single facer stops the corrugation forming operation, the raw paper holding member is displaced from the release position to the holding position; a second control process for controlling the second driving means so that the conveying force imparting member imparts a conveying force to the core raw paper in a state in which the core raw paper holding member is displaced from the holding position to the release position and then located at the release position, in order to convey the core raw paper to the meshing position; The first control process controls the first drive means so that when the single facer stops the step forming operation, the core raw paper holding member displaces from a release position to a holding position to hold the upstream core raw paper portion and the downstream core raw paper portion where the core raw paper present on the conveying path to the engagement position via the outer circumferential surface of the preheater roll is cut in a predetermined conveying direction, and controls the first drive means so that the core paper holding member is maintained in the holding position until the single facer starts the step forming operation.

11. a corrugated roll assembly including an upper corrugated roll and a lower corrugated roll which mesh with each other to form a corrugated shape of a core raw paper, the corrugated roll assembly having a structure which can be replaced with another corrugated roll assembly; a rotatable preheater roll which heats the core raw paper; a transport path formed so that the core raw paper is transported in a predetermined transport direction via an outer circumferential surface of the preheater roll to an engagement position between the upper corrugated roll and the lower corrugated roll; a paper holding member which is disposed on the transport path between an exit position on the transport path where the core raw paper leaves the outer circumferential surface of the preheater roll and is transported in the predetermined transport direction toward the engagement position and the engagement position, and which is displaceable to either a holding position which holds the core raw paper or a release position which releases the hold; and a transport force applying member which is operable to apply a transport force to the core raw paper toward the engagement position, a holding step of holding the corrugated core paper present on the conveying path between the discharge position and the meshing position on the conveying path by displacing the corrugated core paper holding member from the release position to the holding position after the single facer has stopped the corrugation operation of the corrugated core paper and before the corrugation roll assembly is replaced; a cutting step of cutting the core raw paper present on a transport path via an outer circumferential surface of a preheater roll to an engagement position, the core raw paper present on the transport path between a specific position on the transport path where the core raw paper is held in the holding step and the engagement position, into an upstream core raw paper portion and a downstream core raw paper portion in a predetermined transport direction; a releasing step of releasing the holding of the core raw paper portion on the upstream side by displacing the raw paper holding member from the holding position to the releasing position after the replacement of the corrugating roll assembly is completed; The automatic core raw paper feeding method includes a conveying force imparting step of imparting a conveying force to the upstream core raw paper portion released from the hold in the releasing step by a conveying force imparting member in order to transport the core raw paper to the meshing position after replacement of the corrugated roll assembly is completed.

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