Sheet cutting device and control method for sheet cutting device

Abstract

To enhance convenience when forming a sheet of a desired paper size by cutting a web deposited with fibers.SOLUTION: A sheet cutting device mountable on a sheet manufacturing apparatus that forms a web by depositing raw materials containing fibers and applying at least one of heating and pressing. The sheet cutting device includes: a transport unit that transports the web; a cutter that cuts the web; a sensor that detects a leading end of the web; an input / output unit that is capable of outputting a first screen related to a paper size and a second screen related to an adjustment value of the paper size and is capable of detecting the paper size input on the first screen and the adjustment value input on the second screen; and a control unit. The control unit calculates a target transport amount to be transported by the transport unit after the leading end of the web is detected by the sensor on the basis of the paper size and adjustment value detected by the input / output unit, and cuts the web by the cutter when the transport amount transported by the transport unit is equal to or greater than the target transport amount, to form a sheet corresponding to the paper size and the adjustment value.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to a sheet cutting device and a control method for the sheet cutting device.

Background Art

[0002] Conventionally, as shown in Patent Document 1, there is known a device for setting the cutting position of a printed sheet manually or by external input.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the above device, when cutting a web on which a raw material containing fibers is deposited to form a sheet of a desired paper size for the user, the convenience is low.

Means for Solving the Problems

[0005] A sheet cutting device that can be mounted on a sheet manufacturing apparatus for depositing a raw material containing fibers and forming a web by performing at least one of heating and pressing, the sheet cutting device comprising: a conveying unit that conveys the web; a cutter that cuts the web; a sensor that detects the leading end of the web; an input / output unit that can output a first screen related to a paper size and a second screen related to an adjustment value of the paper size, and can detect the paper size input on the first screen and the adjustment value input on the second screen; and a control unit. The control unit calculates a target conveyance amount to be conveyed by the conveying unit after detecting the leading end of the web by the sensor based on the paper size detected by the input / output unit and the adjustment value, and when the conveyance amount by the conveying unit becomes equal to or greater than the target conveyance amount, cuts the web by the cutter to form a sheet corresponding to the paper size and the adjustment value.

[0006] A control method for a sheet cutting device that can be mounted on a sheet manufacturing apparatus for depositing a raw material containing fibers and forming a web by performing at least one of heating and pressing, the sheet cutting device comprising: a conveying unit that conveys the web; a cutter that cuts the web; a sensor that detects the leading end of the web; an input / output unit that can output a first screen related to a paper size and a second screen related to an adjustment value of the paper size, and can detect the paper size input on the first screen and the adjustment value input on the second screen. The method includes calculating a target conveyance amount to be conveyed by the conveying unit after detecting the leading end of the web by the sensor based on the paper size detected by the input / output unit and the adjustment value, and when the conveyance amount by the conveying unit becomes equal to or greater than the target conveyance amount, cutting the web by the cutter to form a sheet corresponding to the paper size and the adjustment value.

Brief Description of the Drawings

[0007]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Mode for Carrying Out the Invention

[0008] 1. Configuration of the Sheet Manufacturing Apparatus The configuration of the sheet manufacturing apparatus 1 including the sheet cutting device 100 according to the embodiment will be described with reference to FIG. 1. Note that the directions in FIG. 1 will be described using a three-dimensional coordinate system. For convenience of explanation, the positive direction of the Z-axis is referred to as the upward direction or simply up, the negative direction is referred to as the downward direction or simply down, the positive direction of the X-axis is referred to as the right direction or simply right, the negative direction is referred to as the left direction or simply left, and the positive direction of the Y-axis is referred to as the forward direction or simply forward, and the negative direction is referred to as the backward direction or simply backward. The same applies to FIGS. 2 to 4 described later.

[0009] As shown in FIG. 1, the sheet manufacturing apparatus 1 is an apparatus that forms a web W from a raw material containing fibers or the like in a so-called dry method and manufactures a single-sheet-shaped sheet S. In the embodiment, the dry method means that in sheet manufacturing, it is carried out in the air such as the atmosphere without being carried out in a liquid. Note that the sheet manufacturing apparatus 1 is not limited to being dry and may be a so-called wet method. Further, hereinafter, the raw material will be described as moving from upstream to downstream in the sheet manufacturing apparatus 1 while sequentially changing its form to the web V, the web W, and the sheet S.

[0010] The sheet cutting device 100 can be mounted on the sheet manufacturing device 1. The sheet manufacturing device 1 is configured such that, from upstream to downstream where the raw material, web V, web W, and sheet S move, there are a supply unit 10, a crushing unit 12, a fiberizing unit 20, a sorting unit 40, a first web forming unit 45, a rotating body 49, a mixing unit 50, a deposition unit 60, a web conveying unit 79, a pressure heating unit 80, and the sheet cutting device 100 is arranged. Note that although the sheet cutting device 100 cuts the web W, since it cuts the web W to form the sheet S, it is called the sheet cutting device 100.

[0011] Furthermore, the sheet manufacturing device 1 includes a controller, that is, a control unit 90 that comprehensively controls the above-mentioned respective units. The control unit 90 is mounted on a substrate (not shown). The control unit 90 includes a processor and a memory. The processor can read and execute programs such as firmware stored in the memory to control each unit of the sheet manufacturing device 1.

[0012] The substrate provided with the control unit 90 is also provided with an input / output unit 110. The input / output unit 110 is a user interface for the user. The input / output unit 110 is, for example, a touch panel display. The input / output unit 110 includes a display panel that is an output unit for displaying various information and a detection panel that is an input unit. Hereinafter, the display by the input / output unit 110 is also referred to as an output. The detection panel is configured to be superimposed on the display panel. The detection panel detects an input by the operation of the user's finger by methods such as the capacitance method, the resistive film method, and the optical method. Note that in the input / output unit 110, the input unit may be a keyboard, a mouse, buttons, etc., and the output unit may be a stand-alone liquid crystal display, etc. The substrate provided with the control unit 90 and the input / output unit 110 may be provided in the sheet cutting device 100.

[0013] The supply unit 10 supplies the raw material to the crushing unit 12. The supply unit 10 is provided with an automatic feeding mechanism and continuously and automatically inputs the raw material into the crushing unit 12. The raw material includes various fibers or materials of various fibers. The various fibers are not particularly limited, and a wide range of fibers can be used. For example, the fibers include natural fibers (animal fibers, plant fibers), chemical fibers (organic fibers, inorganic fibers, organic-inorganic composite fibers), etc. More specifically, fibers composed of cellulose, silk, wool, cotton, hemp, kenaf, flax, ramie, jute, manila hemp, sisal hemp, coniferous trees, broad-leaved trees, etc. can be mentioned. These may be used alone, may be mixed as appropriate, or may be used as regenerated fibers that have been refined, etc.

[0014] Examples of the fibers include pulp, waste paper, waste cloth, etc. Also, the fibers may be subjected to various surface treatments. Also, the material of the fibers may be a pure substance or a material containing a plurality of components such as impurities and other components. Also, as the fibers, defibrated materials obtained by dry defibrating waste paper, pulp sheets, etc. may be used. The length of the fiber is not particularly limited, but for an independent single fiber, the length along the longitudinal direction of the fiber is 1 μm or more and 5 mm or less, preferably 2 μm or more and 3 mm or less, more preferably 3 μm or more and 2 mm or less.

[0015] In the sheet manufacturing apparatus 1, moisture is imparted to the web W in the humidifying unit 78 described later. For this reason, when using fibers capable of forming hydrogen bonds between fibrils in the raw material, the mechanical strength of the manufactured sheet S can be increased. An example of such a fiber is cellulose. Hereinafter, imparting moisture to the web W is also referred to as humidification.

[0016] Note that the fiber content in the sheet S is, for example, 50% by mass or more and 99.9% by mass or less, preferably 60% by mass or more and 99% by mass or less, more preferably 70% by mass or more and 99% by mass or less. By performing a predetermined blending when forming the mixture in the mixing unit 50 described later, such a content can be achieved.

[0017] The crushing section 12 cuts the raw material supplied by the supply section 10 into small pieces in a dry manner in the air such as the atmosphere. The shape and size of the small pieces are, for example, small pieces with a side length of several centimeters. The crushing section 12 has a crushing blade 14 and a shooter 16 which is a hopper. The crushing blade 14 can cut the input raw material. As the crushing blade 14, for example, a shredder can be used. The small pieces of the raw material cut by the crushing blade 14 are received by the shooter 16.

[0018] The pipe 2 is composed of a pipe 2a for conveying the raw material downward, a pipe 2b for conveying the raw material horizontally, and a pipe 2c for conveying the raw material upward. The small pieces of the raw material received by the shooter 16 are conveyed downward by the pipe 2a, horizontally by the pipe 2b, and upward by the pipe 2c, and reach the inlet 22 of the fibrillation section 20. Note that the small pieces of the raw material are conveyed inside the pipe 2 by the airflow generated by the fibrillation section 20 described later or the blower 26.

[0019] The fibrillation section 20 fibrillates the small pieces of the raw material in a dry manner. The fibrillation section 20 includes an inlet 22, an outlet 24, a stator (not shown), and a rotor (not shown). The stator and the rotor constitute a so-called impeller mill. The small pieces of the raw material introduced from the inlet 22 are sandwiched between the stator and the rotor and rotate, and are fibrillated by the shearing force generated therebetween. By the fibrillation section 20, the entangled fibers are unraveled and fibrillated products are generated.

[0020] Furthermore, the fibrillation section 20 can generate an airflow that sucks the small pieces of the raw material and discharges the fibrillated product due to the rotation of the rotor. The fibrillation section 20 can suck the small pieces of the raw material from the inlet 22 and discharge the fibrillated product to the outlet 24 by the airflow generated by itself. The defibrated material defibrated by the defibrating unit 20 is conveyed from the discharge port 24 through the pipe 3 to the sorting unit 40. Note that, as the air flow for conveying the defibrated material from the defibrating unit 20 to the sorting unit 40, the air flow generated by the defibrating unit 20 may be used, or as shown in FIG. 1, a blower 26 as an air flow generating device may be provided and the air flow thereof may be used.

[0021] Note that the sheet manufacturing apparatus 1 may be configured to include a classification unit (not shown) downstream of the defibrating unit 20. In this case, the defibrated material that has passed through the defibrating unit 20 is conveyed to the classification unit. The classification unit classifies the defibrated material. Specifically, the classification unit separates and removes relatively small ones among the defibrated materials, as well as those with low density such as resin particles, colorants, and additives, and the remaining ones are used as classified materials. The classified materials classified in the classification unit are conveyed to the sorting unit 40. Among the defibrated materials, the proportion of relatively large ones or those with high density increases in the classified materials classified by the classification unit. As the classification unit, for example, a cyclone, an elbow jet, an eddy classifier, etc. are used.

[0022] The sorting unit 40 includes a first drum unit 41 and a first housing unit 43. The sorting unit 40 introduces the defibrated material defibrated by the defibrating unit 20 from the inlet 42 and can sort it according to the fiber length. As the first drum unit 41, for example, a rotatable cylindrical sieve is used. The sieve is composed of, for example, a wire mesh, an expanded metal obtained by stretching a perforated metal plate, a punching metal in which holes are formed in a metal plate by a press or the like. The defibrated material is introduced from the inlet 42 to the inside of the cylindrical sieve of the first drum unit 41.

[0023] The first drum unit 41 is rotated by a motor (not shown). The first drum unit 41 allows a first selected material, which is a fiber or particle smaller than the mesh size of the sieve included in the defibrated material, to pass from the inside to the outside of the cylindrical mesh. The first selected material is dropped to the first web forming unit 45 as described later. On one hand, the first drum section 41 discharges the second sorted material, which is fibers, unsorted pieces, lumps, etc. in the defibrated material that are larger than the mesh opening size of the sieve, from the inside of the cylindrical net to the discharge port 44. The second sorted material is returned to the defibrating section 20 via the pipe 8 including the horizontal pipe 8a and the vertical pipe 8b. The second sorted material is defibrated again by the defibrating section 20. In this way, the sorting section 40 can sort the defibrated material into the first sorted material and the second sorted material.

[0024] The first web forming section 45 deposits the first sorted material descending from the first drum section 41 to form the web V. The first web forming section 45 includes, for example, a first mesh belt 46, a plurality of first supporting rollers 47 including the first supporting roller 47a, and a first suction section 48 which is a suction mechanism. The first sorted material that has passed through the net of the first drum section 41 is deposited on the first mesh belt 46. The first mesh belt 46 is stretched by the first supporting rollers 47 and is configured to be difficult for the first sorted material to pass through and easy for air to pass through. The first mesh belt 46 is a so-called endless belt, and it rotates clockwise when the first supporting rollers 47 rotate by a motor (not shown). While the first mesh belt 46 rotates, the first sorted material continuously descends from the first drum section 41, and thus the web V is formed on the first mesh belt 46.

[0025] The first suction section 48 is provided below the first mesh belt 46. The first suction section 48 can generate a downward airflow. By the first suction section 48, the mixture dispersed in the air by the first drum section 41 can be sucked onto the first mesh belt 46. Also, by the first suction section 48, the descending speed of the first sorted material from the sorting section 40 can be increased. Furthermore, by the first suction section 48, a downflow can be formed in the descending path of the mixture, and it is possible to prevent fibers and the like contained in the first sorted material from getting entangled during descent. The web V is formed in a state of containing a lot of air, being soft and swollen by passing through the sorting section 40 and the first web forming section 45. The web V deposited on the first mesh belt 46 is conveyed to the rotating body 49.

[0026] The rotating body 49 can cut the web V. The rotating body 49 has a base 49a that is a shaft and a plurality of protrusions 49b protruding from the base 49a. The protrusions 49b have, for example, a plate-like shape. The plurality of protrusions 49b are provided at equal intervals on the base 49a. The base 49a and the protrusions 49b rotate in the direction R which is counterclockwise. By the rotating protrusions 49b, the web V is cut into a predetermined length. By cutting the web V into a predetermined length by the rotating body 49, fluctuations in the amount of the web V supplied to the downstream deposition part 60 per unit time can be reduced.

[0027] The rotating body 49 is provided in the vicinity of the first tension roller 47a on the downstream side in the first web forming part 45. The rotating body 49 is provided at a position where the protrusions 49b can contact the web V and does not contact the first mesh belt 46 on which the web V is deposited. Thereby, it is possible to suppress the first mesh belt 46 from being worn by contact with the protrusions 49b. Also, the shortest distance between the protrusion 49b and the first mesh belt 46 is, for example, 0.05 mm or more and 0.5 mm or less. If the shortest distance between the protrusion 49b and the first mesh belt 46 is within the above range, the rotating body 49 can cut the web V without contacting the first mesh belt 46. The web V cut by the rotating body 49 is put into the pipe 7.

[0028] The mixing part 50 is composed of a pipe 54, an additive supply part 52, a hopper 9, and a blower 56. The pipe 54 communicates with the pipe 7. The additive supply part 52 supplies an additive to the pipe 54 via the hopper 9. Note that the hopper 9 may be configured to include a screw feeder (not shown), a disk feeder (not shown), etc. Further, a valve (not shown) may be provided between the hopper 9 and the pipe 54 to adjust the amount of the additive supplied from the hopper 9 to the pipe 54. By the valve, the mixing ratio of the first selected material contained in the web V and the additive can be adjusted.

[0029] The additive supplied from the additive supply unit 52 may contain a resin for binding a plurality of fibers. The resin is a thermoplastic resin or a thermosetting resin, and examples thereof include AS resin, ABS resin, polypropylene, polyethylene, polyvinyl chloride, polystyrene, acrylic resin, polyester resin, polyethylene terephthalate, polyphenylene ether, polybutylene terephthalate, nylon, polyamide, polycarbonate, polyacetal, polyphenylene sulfide, polyether ether ketone, and the like. These resins may be used alone or mixed as appropriate. The resin can be melted when passing through a pressure heating unit 80, which will be described later, located downstream, to bind a plurality of fibers.

[0030] Note that the additive supplied from the additive supply unit 52 may contain, in addition to the resin for binding the fibers, a colorant for coloring the fibers, an aggregation inhibitor for suppressing the aggregation of the fibers and the resin, and a flame retardant for making the fibers and the like difficult to burn, according to the type of the sheet to be manufactured. Further, the additive may contain a binder such as starch or dextrin, for example. The additive supplied from the additive supply unit 52 may be fibrous or powdery.

[0031] The pipe 54 communicates with the inside of the mixing unit 50. The mixing unit 50 mixes the first selected material contained in the web V and the additive in the air such as the atmosphere to generate a mixture. The mixing unit 50 can generate an air current by the blower 56 and convey while mixing the first sorted material and the additive. Note that the mixing unit 50 is not limited to the blower 56, and it may be a device that stirs with blades rotating at high speed, or a device that utilizes the rotation of a container like a V-type mixer. The mixture generated by the mixing unit 50 is conveyed to the deposition unit 60 through the pipe 54.

[0032] The deposition unit 60 includes a second drum part 61 and a second housing part 63. The second drum part 61 uses a cylindrical sieve that can be rotated by a motor (not shown), and can have the same configuration as the above-mentioned first drum part 41. The second drum part 61 allows fibers or particles contained in the mixture and smaller than the mesh size of the sieve to pass from the inside to the outside of the rotating cylindrical mesh. The deposition unit 60 can introduce the mixture from the inlet 62 and uniformly lower it to the second web forming unit 70 by the second drum part 61.

[0033] The second web forming unit 70 deposits the mixture descending from the second drum part 61 to form the web W. The second web forming unit 70 includes a second mesh belt 72, a plurality of second tension rollers 74, and a second suction part 76 which is a suction mechanism. The second web forming unit 70 can have the same configuration as the above-mentioned first web forming unit 45.

[0034] On the second mesh belt 72, the mixture that has passed through the mesh of the second drum part 61 is deposited. The second mesh belt 72 is tensioned by the second tension rollers 74 and is configured to be difficult for the mixture to pass through and easy for air to pass through. The second mesh belt 72 is a so-called endless belt, and the second tension rollers 74 rotate by themselves due to a motor (not shown), causing it to circulate clockwise. While the second mesh belt 72 circulates, the mixture continuously descends from the second drum part 61, thereby forming the web W on the second mesh belt 72.

[0035] The second suction part 76, which is a suction mechanism, is provided below the second mesh belt 72. The second suction part 76 can generate a downward airflow. The second suction part 76 can suck the mixture dispersed in the air by the second drum part 61 onto the second mesh belt 72. Also, the second suction part 76 can increase the descent speed of the mixture from the deposition part 60. Furthermore, the second suction part 76 can form a downflow in the descent path of the mixture, preventing fibers, additives, etc. contained in the mixture from getting entangled during descent.

[0036] In this way, the deposition part 60 can deposit the mixture containing fibers to form the web W. By passing through the deposition part 60, additives, etc. are further mixed with the fibers, and the web W in a soft and swollen state containing a lot of air is formed.

[0037] A humidifying part 78 for humidifying the web W is provided downstream of the second suction part 76 of the web W on the second mesh belt 72. The humidifying part 78 is composed of a piezoelectric vibrator (not shown) and a water tank (not shown). The humidifying part 78 generates mist from the water in the water tank by the piezoelectric vibrator. The humidifying part 78 can adjust the amount of mist generated by changing the vibration frequency of the piezoelectric vibrator, and can adjust the humidity of the web W. The humidifying part 78 is provided above the second mesh belt 72. A third suction part 78a, which is a suction mechanism, is provided below the second mesh belt 72. The third suction part 78a can generate a downward airflow of the mist. The humidifying part 78 can humidify the web W on the second mesh belt 72 uniformly in the thickness direction.

[0038] A web conveying part 79 is arranged downstream of the humidifying part 78 on the second mesh belt 72. The web conveying part 79 conveys the web W on the second mesh belt 72 in the conveying direction. In FIG. 1, the conveying direction is the right direction, and the direction opposite to the conveying direction is the left direction. The web conveyance unit 79 includes a third mesh belt 79a which is an endless belt, a plurality of third supporting rollers 79b, and a fourth suction unit 79c which is a suction mechanism. The fourth suction unit 79c can generate an air flow to suck the web W from above through the third mesh belt 79a and adsorb the web W below the third mesh belt 79a.

[0039] The web conveyance unit 79 peels the web W from the second mesh belt 72 and conveys it to the pressure heating unit 80. In the web conveyance unit 79, the third mesh belt 79a rotates due to the rotation of the plurality of third supporting rollers 79b, and conveys the web W adsorbed below the third mesh belt 79a to the pressure heating unit 80. It is preferable that the circumferential speed of the second mesh belt 72 and the circumferential speed of the third mesh belt 79a are the same circumferential speed.

[0040] The pressure heating unit 80 is configured to, for example, heat the web W after pressurizing it. The pressure heating unit 80 includes a pressurizing unit 82 for pressurizing the web W and a heating unit 84 for heating the web W. The pressurizing unit 82 is composed of a pair of calendar rollers 85. The heating unit 84 is composed of a pair of heating rollers 86. The heating unit 84 may be a hot press forming machine, a hot plate, a warm air blower, an infrared heater, a flash fuser, etc. By the pressure heating unit 80, the moisture contained in the web W evaporates after the temperature rises, and the thickness of the web W can be reduced to increase the fiber density. At this time, if the web W contains a binder, a plurality of fibers can be bound to each other through the binder. By the pressure heating unit 80, a web W with strong mechanical strength and good quality can be formed.

[0041] Note that the heating of the web W by the heating unit 84 preferably has the web W at a temperature of 60°C or higher and 200°C or lower, and more preferably 70°C or higher and 160°C or lower. Further, the pressure applied to the web W by the pressing unit 82 is preferably 0.1 Mpa or more and 15 MPa or less, more preferably 0.2 Mpa or more and 10 MPa or less, and even more preferably 0.4 Mpa or more and 8 MPa or less. Within such a pressure range, deterioration of the fibers can be suppressed, and a sheet S with good strength can be manufactured again using the defibrated material obtained by defibrating the manufactured sheet S as a raw material. The pressurizing and heating unit 80 may be configured to perform at least one of heating and pressurizing. The pressurizing and heating unit 80 can form a compressed web W by performing at least one of heating and pressurizing.

[0042] The sheet cutting device 100 includes a cutter 101 and cuts the web W compressed by the pressurizing and heating unit 80 to a predetermined length. Details of the sheet cutting device 100 will be described later. The web W cut by the sheet cutting device 100 is discharged to the discharge unit 120 as a single sheet S and placed thereon.

[0043] 2. Configuration of Sheet Cutting Device The configuration of the sheet cutting device 100 according to the embodiment will be described with reference to FIGS. 2 to 4. As shown in FIG. 2, the sheet cutting device 100 includes a transport unit 102. The transport unit 102 transports the web W from the upstream to the downstream in the transport direction F. Also, in the sheet cutting device 100, a cutter 101, a sensor 107, and a slitter 103 are arranged from the upstream to the downstream in the transport direction F. The distance between the cutter 101 and the sensor 107 is the first distance L1.

[0044] The cutter 101 cuts the web W in the front-rear direction, which is a direction intersecting the transport direction F, and can define the length of the sheet S. The cutter 101 is moved by a cutter motor 101a. The cutter motor 101a also includes a gear. The cutter 101 can cut the web W while moving by means of a cutter motor 101a. The cutter 101 is, for example, a so-called rotary cutter having a rotary blade. When the cutter 101 is a rotary cutter, the cutter 101 moves while rotating to cut the web W. Note that the cutter 101 may be of another type, such as a flat blade cutter, instead of a rotary cutter.

[0045] The conveying unit 102 arranges a first roller pair 104, a second roller pair 105, and a third roller pair 106 from upstream to downstream in the conveying direction F. The first roller pair 104 includes a first motor 104a, a first driving roller 104b, and a first driven roller 104c. The second roller pair 105 includes a second motor 105a, a second driving roller 105b, and a second driven roller 105c. The third roller pair 106 includes a third motor 106a, a third driving roller 106b, and a third driven roller 106c. The first motor 104a, the second motor 105a, and the third motor 106a each include a gear. Each motor is, for example, a stepping motor.

[0046] Each driving roller rotates clockwise by each motor, and each driven roller rotates counterclockwise. Each driving roller and each driven roller sandwich the web W and convey it in the conveying direction F. So that the conveyed web W does not slacken, it is preferable that the roller pairs of the conveying unit 102 have a faster conveying speed for the downstream roller pairs.

[0047] Here, the first roller pair 104, the second roller pair 105, and the third roller pair 106 are described as having the same conveying speed. When these roller pairs have the same conveying speed, each roller pair may be configured to be interlocked by a belt, a gear, or the like. Also, there may be one motor for driving each roller pair. Since each roller pair has the same operation, hereinafter, unless otherwise specified, the first roller pair 104 will be described, and the description of the second roller pair 105 and the third roller pair 106 will be omitted. When the first motor 104a is a stepping motor, a predetermined number of pulses are applied to the first motor 104a. As a result, the first roller pair 104 can convey the web W by a predetermined distance.

[0048] The slitter 103 is provided with gear-shaped cutters on both sides of the web W. The slitter 103 is installed on both sides in the width direction of the web W. The slitter 103 can cut the web W in the left-right direction, which is parallel to the conveying direction F, on both sides in the width direction of the web W, and define the width of the sheet S. The slitter 103 is rotated counterclockwise by a slitter motor 103a. The slitter motor 103a also includes a gear.

[0049] FIG. 2 shows a state where the leading end W1 of the web W is at the position of the cutter 101. Next, FIG. 3 shows a state where the web W is conveyed by a first distance L1 in the conveying direction F by the conveying unit 102 and the leading end W1 of the web W reaches the position of the sensor 107. In FIG. 3, for the sake of clarity, it is shown that the cutter 101 is slightly raised before cutting the web W. Actually, the cutter 101 is at the height position shown in FIG. 4 as described later. The cutter 101 is in a retracted position, which is a position away from the edge of the web W in the front-rear direction before cutting the web W.

[0050] As shown in FIG. 3, the sensor 107 can detect the leading end W1 of the web W. Note that the sensor 107 may be an optical sensor or a mechanical switch. When the control unit 90 described above detects the leading end W1 of the web W by the sensor 107, it can determine that the distance from the leading end W1 of the web W to the cutter 101 is the first distance L1.

[0051] As shown in FIG. 4, for the sheet S to be formed, the target length is set as the second distance L2. When the distance from the leading end W1 of the web W to the cutter 101 reaches the second distance L2, the cutter 101 moves to cut the web W. In FIG. 4, to make it easier to understand that the cutter 101 cuts the web W while comparing with FIG. 3, the cutter 101 is shown at a position slightly lower in the arrow direction with respect to FIG. 3. As described above, actually, the cutter 101 is at the height position of FIG. 4. The cutter 101 rotates while moving back and forth in the front-rear direction from the retracted position toward the web W, and cuts the web W. As a result, a sheet S having a length of the second distance L2 is formed.

[0052] Here, let the distance from the position of the tip W1 of the web W being conveyed to the cutter 101 be the distance L. As described above, when the tip W1 of the web W is detected by the sensor 107, the distance L is the first distance L1. Further, in order to make the distance L the second distance L2, the web W may be conveyed by the conveyance unit 102 by a distance of L2 - L1, which is obtained by subtracting the first distance L1 from the second distance L2. Let this distance be the distance (L2 - L1). That is, the sheet cutting device 100 may cut the web W with the cutter 101 after conveying the web W by the distance (L2 - L1) by the conveyance unit 102 after detecting the tip W1 of the web W by the sensor 107.

[0053] As described above, the description will be given focusing on the first roller pair 104 of the conveyance unit 102. The control unit 90 calculates the number of pulses of the first motor 104a for conveying the web W over the distance (L2 - L1) by the first roller pair 104. The control unit 90 may apply the calculated number of pulses to the first motor 104a. The first roller pair 104, that is, the conveyance unit 102 can convey the web W by the distance (L2 - L1). As a result, the distance from the tip W1 of the web W to the cutter 101 becomes the second distance L2. When the web W is cut by the cutter 101 at this position, a sheet S having a length of the second distance L2 is formed.

[0054] As described above, the web W that has reached the position of the slitter 103 is conveyed by the conveyance unit 102 while being cut on both sides and becomes a predetermined width. Incidentally, if the conveyance speed of the third roller pair 106, which is the most downstream in the conveyance unit 102, is made faster than the conveyance speed of the upstream first roller pair 104, the cut sheet S can be smoothly separated from the web W. The conveyance speeds of the third roller pair 106 and the second roller pair 105 may be made faster than the conveyance speed of the first roller pair 104.

[0055] When the sheet S is cut by the slitter 103 over the entire length in the conveyance direction F, it is completed as a sheet S having a predetermined length and a paper size of a predetermined width. After cutting, the web W again has its leading end W1 at the position of the cutter 101 as shown in FIG. 2. The sheet cutting device 100 can repeat the above-described operation to form the next sheet S.

[0056] 3. Control Method of Sheet Cutting Device Regarding the control method of the sheet cutting device 100 according to the embodiment, with reference to FIGS. 5 to 7, and further in correspondence with FIGS. 2 to 4 described above, it will be described. As shown in FIG. 5, the control unit 90 starts the process and can display the first screen 111 shown in FIG. 6 and the second screen 112 shown in FIG. 7 on the display panel of the above-described input / output unit 110. Further, the control unit 90 can detect the input of the paper size 121 shown in FIG. 6 and the adjustment value 122 shown in FIG. 7 through the detection panel of the input / output unit 110. Incidentally, when the control unit 90 displays the first screen 111 through the input / output unit 110 and detects the input of the paper size 121 by the operation of the user, it can then automatically display the second screen 112.

[0057] For example, assume that the user selects and inputs "A3 extended" as the paper size 121 from the first screen 111 shown in FIG. 6. Note that "A3 extended" indicates a size larger than "A3". Here, it is assumed that "A3 extended" is longer in length than "A3". When the control unit 90 detects the input of "A3 extended" as the paper size 121 through the input / output unit 110, it determines that the paper size of the sheet S to be formed is "A3 extended" (S100).

[0058] Next, assume that the user selects and inputs level "1" as the adjustment value 122 from the second screen 112 shown in FIG. 7. Level "1" indicates that the length is, for example, 5 mm longer than the length of "A3". Level "2" indicates that the length is 10 mm longer. Note that the size of "A3" is 297 mm in width and 420 mm in length. When the control unit 90 detects the input of level "1" as the adjustment value 122 through the input / output unit 110, it determines that the adjustment value for the length of the sheet S to be formed is level "1" (S101). The adjustment value is also referred to as an offset value.

[0059] In this way, the control unit 90 can output, through the input / output unit 110, the first screen 111 related to the paper size 121 and the second screen 112 related to the adjustment value of the paper size 121, and can detect the paper size 121 input on the first screen 111 and level "1" which is the adjustment value 122 input on the second screen 112. In addition, when the control unit 90 detects through the input / output unit 110 that the paper size 121 has been input on the first screen 111, it can then output the second screen 112.

[0060] The control unit 90 calculates the above-mentioned second distance L2 from the determined paper size "A3 extended" and the determined adjustment value of 5 mm which is level "1". For example, the control unit 90 adds 5 mm which is level "1" to the length of 420 mm of "A3" and calculates it as 420 + 5 = 425, 425 mm.

[0061] As shown in FIG. 3, after the sensor 107 detects the leading end W1 of the web W, as shown in FIG. 4, the control unit 90 conveys the web W by the conveying unit 102 until the distance from the leading end W1 of the web W to the cutter 101 reaches the second distance L2. Then, the control unit 90 cuts the web W by the cutter 101. As a result, a sheet S with a length of the second distance L2 is formed.

[0062] As described above, after the control unit 90 detects the leading edge W1 of the web W by the sensor 107, the conveying unit 102 may convey the distance (L2 - L1). As described above, the first roller pair 104 of the conveying unit 102 will be described. The control unit 90 attempts to convey the web W by the distance (L2 - L1) by the first roller pair 104. The control unit 90 calculates the number of pulses of the first motor 104a, which is a stepping motor for conveying the distance (L2 - L1), as the target conveyance amount TC (S102). In this way, the control unit 90 calculates the target conveyance amount TC to be conveyed by the conveying unit 102 after detecting the leading edge W1 of the web W by the sensor 107 based on the paper size 121 detected by the input / output unit 110 and the level "1" which is the adjustment value 122.

[0063] As shown in FIG. 2, it is assumed that the leading edge W1 of the web W is at the position of the cutter 101. The control unit 90 applies a pulse to the first motor 104a of the conveying unit 102 to start the conveyance of the web W (S103). The control unit 90 determines whether the sensor 107 detects the leading edge W1 of the web W (S104). The control unit 90 waits while continuing to convey the web W until the sensor 107 detects the leading edge W1 of the web W (S104: NO).

[0064] As shown in FIG. 3, when the sensor 107 detects the leading edge W1 of the web W (S104: YES), the control unit 90 continues to convey the web W while counting the conveyance amount C (S105). The conveyance amount C is the number of pulses applied to the first motor 104a, and the initial value is 0. The control unit 90 compares the conveyance amount C and the target conveyance amount TC, and determines whether the conveyance amount C is greater than or equal to the target conveyance amount TC, i.e., conveyance amount C ≥ target conveyance amount TC (S106). The control unit 90 waits while continuing to convey the web W until conveyance amount C ≥ target conveyance amount TC (S106: NO). During this period, the control unit 90 counts the conveyance amount C (S105).

[0065] When the control unit 90 determines that the conveyance amount C ≥ the target conveyance amount TC (S106: YES), as shown in FIG. 4, the distance from the leading end W1 of the web W to the cutter 101 becomes the second distance L2. At this position, when the web W is cut by the cutter 101 (S107), a sheet S having a length of the second distance L2 is formed. Here, the length of "A3 extended", which is the second distance L2, is 425 mm, which is longer than "A3".

[0066] The web W conveyed by the conveyance unit 102 and reaching the position of the slitter 103 is cut on both sides and becomes the width of "A3 extended". Here, the width of "A3 extended" is the same as the width of "A3". When the sheet S is cut by the slitter 103 over the entire length in the conveyance direction F, it is formed as a sheet S having the paper size of "A3 extended". In this way, when the conveyance amount C by the conveyance unit 102 becomes equal to or greater than the target conveyance amount TC, the control unit 90 can cut the web W by the cutter 101 and form the sheet S corresponding to the paper size 121 and the adjustment value 122 detected by the input / output unit 110.

[0067] The control unit 90 determines whether an operation of "stop command" by the user is detected by the input / output unit 110 (S108). When the control unit 90 determines that an operation of "stop command" has been performed by the input / output unit 110 (S108: YES), it ends the process. On the other hand, when the control unit 90 determines that the operation of "stop command" has not been performed (S108: NO), it repeats the process of conveying and cutting the web W so as to form the next sheet S of "A3 extended" (S104).

[0068] As described above, the sheet cutting device 100 according to the embodiment can be mounted on the sheet manufacturing device 1. The sheet cutting device 100 includes a conveyance unit 102 that conveys the web W, a cutter 101 that cuts the web W, and a sensor 107 that detects the leading end W1 of the web W. Furthermore, the sheet cutting device 100 can output a control unit 90, a first screen 111 related to the paper size 121, and a second screen 112 related to the adjustment value 122 of the paper size 121, and includes an input / output unit 110 capable of detecting the paper size 121 input on the first screen 111 and the level "1" which is the adjustment value 122 input on the second screen 112.

[0069] Based on the paper size 121 detected by the input / output unit 110 and the level "1" which is the adjustment value 122, the control unit 90 calculates a target conveyance amount TC to convey after detecting the leading end W1 of the web W by the sensor 107 by the conveyance unit 102. When the conveyance amount C by the conveyance unit 102 becomes equal to or greater than the target conveyance amount TC, the control unit 90 cuts the web W by the cutter 101 and can form a sheet S corresponding to the paper size 121 and the adjustment value 122 detected by the input / output unit 110.

[0070] The user only needs to select the paper size 121 on the displayed first screen 111 and then select the adjustment value 122 on the next displayed second screen 112 for the input / output unit 110. In this way, the sheet cutting device 100 can improve the convenience when cutting the web W on which the raw material containing fibers is deposited to form the sheet S corresponding to the paper size 121 and the adjustment value 122 desired by the user.

[0071] As described above, these embodiments have been described in detail with reference to the drawings, but the specific configuration is not limited to these embodiments, and may be changed, replaced, deleted, etc. without departing from the gist of the present invention.

Description of Reference Numerals

[0072] 1... Sheet manufacturing apparatus, 90... Control unit, 100... Sheet cutting apparatus, 101... Cutter, 102... Conveyor unit, 104... First roller pair, 104a... First motor, 105... Second roller pair, 106... Third roller pair, 107... Sensor, 110... Input / output unit, 111... First screen, 112... Second screen, 121... Paper size, 122... Adjustment value, C... Conveying amount, F... Conveying direction, L1... First distance, L2... Second distance, TC... Target conveying amount, V, W... Web, W1... Tip, S... Sheet.

Claims

1. A sheet cutting device mountable on a sheet manufacturing apparatus that deposits a raw material containing fibers and forms a web by performing at least one of heating and pressurization, comprising: a conveyance unit that conveys the web; a cutter that cuts the web; a sensor that detects the leading end of the web; an input / output unit capable of outputting a first screen related to a paper size and a second screen related to an adjustment value of the paper size, and capable of detecting the paper size input on the first screen and the adjustment value input on the second screen; a control unit, wherein the control unit: calculates a target conveyance amount to be conveyed by the conveyance unit after detecting the leading end of the web by the sensor based on the paper size detected by the input / output unit and the adjustment value; when the conveyance amount by the conveyance unit becomes equal to or greater than the target conveyance amount, cuts the web by the cutter to form a sheet corresponding to the paper size and the adjustment value.

2. The sheet cutting device according to claim 1, wherein the conveyance unit includes a stepping motor, and the target conveyance amount is the number of pulses of the stepping motor.

3. The control unit: when the input / output unit detects that the paper size has been input on the first screen, outputs the second screen.

4. The sheet cutting device according to claim 1, wherein the input / output unit is a touch panel display.

5. A control method for a sheet cutting device that is mountable on a sheet manufacturing apparatus that deposits a raw material containing fibers and forms a web by performing at least one of heating and pressurization, and includes a conveyance unit that conveys the web, a cutter that cuts the web, a sensor that detects the leading end of the web, and an input / output unit capable of outputting a first screen related to a paper size and a second screen related to an adjustment value of the paper size, and capable of detecting the paper size input on the first screen and the adjustment value input on the second screen, the method comprising: calculating a target conveyance amount to be conveyed by the conveyance unit after detecting the leading end of the web by the sensor based on the paper size detected by the input / output unit and the adjustment value; A control method for a sheet cutting device, which cuts the web by the cutter and forms a sheet corresponding to the paper size and the adjustment value when the conveyance amount by the conveyance unit becomes equal to or greater than the target conveyance amount.

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