Sheet cutting device, sheet supply device, and roll replacement method

Abstract

To provide an art which enables a worker to replace a roll of a protection sheet smoothly without stopping a line, regardless of a skill level of the worker.SOLUTION: A sheet cutting device (4) cuts a sheet supplied thereto and includes: a cutting part (41) which is provided on a supply path of the sheet (S) and generates heat at a temperature higher than a melting point of the sheet by energization; a power source (43) which energizes the cutting part; and a drive part (44) which causes the cutting part to reciprocate in a direction intersecting with a sheet supply direction.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a sheet cutting device, a sheet feeding device, and a roll replacement method.

Background Art

[0002] Blackboards or marker boards having an enamel layer formed on the surface are known (see, for example, Patent Document 1). In order to prevent damage to the surface material (such as an enamel layer) during transportation, a protective sheet is attached to the surface material. The protective sheet is attached to the surface of the fired surface material in the manufacturing process of the surface material. The protective sheet is wound in a roll and supplied to the conveyance line in accordance with the conveyance speed of the surface material. Here, in order to keep the firing time of the surface material constant, even when the remaining amount of the protective sheet becomes small and the roll is replaced, the line is not stopped. Therefore, when replacing the roll of the protective sheet, it is necessary to cut the protective sheet of the roll and overlap and connect it to the protective sheet of the newly attached roll.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Currently, an operator checks the remaining amount of the protective sheet of the roll, manually cuts the protective sheet, overlaps and connects the protective sheet of the newly attached roll to the rearmost part of the cut protective sheet, and ensures that the protective sheet supplied to the surface material does not break. Since the protective sheet continues to be supplied toward the surface material during this operation, a person who is not skilled cannot complete the roll replacement in a short time, and there is a problem that the line has to be stopped if it cannot be made in time.

[0005] Therefore, the present invention has been made in view of the above problems, and an object thereof is to provide a technique capable of smoothly performing roll replacement of a protective sheet without stopping the line regardless of the skill level of an operator.

Means for Solving the Problems

[0006] In order to solve the above problems, one aspect of the present invention is a sheet cutting device for cutting a supplied sheet, which is provided on a supply path of the sheet and has a cutting portion that generates heat at a temperature higher than the melting point of the sheet by energization, a power source for energizing the cutting portion, and a drive portion for reciprocating the cutting portion in a direction intersecting the supply direction of the sheet, and is characterized by comprising these components.

[0007] Further, it is preferable that the cutting portion is a nichrome wire.

[0008] Further, it is preferable that the extending direction of the cutting portion is orthogonal to the moving direction of the cutting portion.

[0009] One aspect of the present invention is a sheet supply device for supplying a sheet to be attached to the surface of a protection object toward the protection object, which includes a first support portion for supporting a first roll around which the sheet is wound in a roll shape, a second support portion for supporting a second roll around which the sheet is wound in a roll shape, a moving device for moving one of the first support portion and the second support portion to a supply position and the other to a standby position, the sheet cutting device described above, and a control portion for controlling the drive of the moving device. The control portion moves one roll in the standby position and presses it against the sheet fed out from the other roll in the supply position to overlap the respective sheets, drives the moving device so as to feed out sheets from the two rolls, and the sheet cutting device is provided at a position for cutting the sheet fed out from the other roll on the upstream side of the overlapped sheets.

[0010] Further, it is preferable that the control unit drives the moving device so that after the sheet cutting device cuts the sheet fed from the other roll on the upstream side of the stacked sheets, the one roll is moved to the supply position.

[0011] Further, it is preferable that the control unit drives the sheet cutting device to cut the sheet being fed from the other roll on the upstream side of the stacked sheets.

[0012] Further, an arm portion that supports the first support portion and the second support portion is provided, and it is preferable that the moving device rotates the arm portion so that each roll supported by each support portion alternately reaches the supply position and the standby position.

[0013] One aspect of the present invention is a roll replacement method using the above sheet supply device, which includes moving one roll in the standby position and pressing it against the sheet fed from the other roll in the supply position to stack the respective sheets on top of each other, feeding sheets from the two rolls respectively, driving the sheet cutting device to cut the sheet fed from the other roll on the upstream side of the stacked sheets, and after cutting the sheet, moving the one roll to the supply position.

Effect of the Invention

[0014] According to one aspect of the present invention, regardless of the skill level of the operator, the roll replacement of the protective sheet can be smoothly performed without stopping the line.

Brief Description of the Drawings

[0015]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Embodiments for Carrying Out the Invention

[0016] Hereinafter, embodiments of the present invention will be described with reference to the drawings. It should be noted that in the following description, the drawings are schematic, and it is necessary to pay attention to the fact that the dimensional relationships of each element, the ratios of each element, etc. may be different from the actual situation. There may also be parts where the dimensional relationships and ratios are different between the drawings.

[0017] <Configuration of the Sheet Supply Device> As shown in FIG. 1, the sheet supply device 100 supplies a protective sheet (protective film) that is attached to the surface material (enamel) of a blackboard or marker board to prevent damage to the surface material to be protected during transportation, to the surface material on the manufacturing line. That is, the sheet supply device 100 is provided on the downstream side of the firing process in the manufacturing line, and the surface material is carried out after the sheet s is attached. Here, the surface material is formed, for example, on the surface of a steel plate serving as a base material. The sheet supply device 100 includes support parts 1 and 2, a moving device 3, a sheet cutting device 4, and a control part 5.

[0018] The support parts 1 and 2 support rolls 8 and 9 around which the sheet s is wound in a roll shape. The support parts 1 and 2 support the roll 8 that supplies the sheet s to the surface material and the roll 9 that is used next after the roll 8 that supplies the sheet s. For example, the support part 1 (the first support part) supports the roll 8 (the first roll), and the support part 2 (the second support part) supports the roll 9 (the second roll). Of course, it is also possible that the support part 1 supports the roll 9 and the support part 2 supports the roll 8. The support parts 1 and 2 are rod-shaped members passed through the cores of the rolls 8 and 9, both are formed in the same size, and are formed longer than the widths of the rolls 8 and 9.

[0019] The support parts 1 and 2 are both attached to the arm part 10. The support parts 1 and 2 are provided on the arm part 10 so as to be arranged in parallel respectively. The arm part 10 is a plate material long in one direction. The support part 1 is provided at one end of the arm part 10, and the support part 2 is provided at the other end of the arm part 10. The arm part 10 supports the support parts 1 and 2 and is connected to the moving device 3, and rotates around the axis by the drive of the moving device 3. Thereby, the support parts 1 and 2 move, and the rolls 8 and 9 supported by the support parts 1 and 2 also move. The sheet s is, for example, a resin sheet (film) having a melting point lower than the heat generation temperature of the cutting part 41 of the sheet cutting device 4. Specifically, the sheet s is, for example, a sheet made of polyethylene, polypropylene or vinyl chloride, and an adhesive for attaching to the surface material is applied on one surface. All the rolls 8 and 9 supported by the support parts 1 and 2 are also of the same size. Note that the material of the sheet s is not limited to polyethylene, polypropylene or vinyl chloride, and any material that can be cut by the cutting part 41 may be used.

[0020] The moving device 3 is connected to the arm part 10. The moving device 3 includes, for example, a motor 31 (see FIG. 3) and a drive shaft 32 connected to the shaft of the motor 31 and rotating around the axis together with the shaft. The moving device 3 rotates the arm part 10 so that each roll 8 and 9 supported by each support part 1 and 2 alternately reaches the supply position and the standby position. Specifically, one end of the drive shaft 32 is connected to the shaft of the motor 31, and the other end is connected to the arm part 10. The drive shaft 32 is attached to the center in the longitudinal direction of the arm part 10, and the distance from the axis of the drive shaft 32 to the axis of the support part 1 is equal to the distance from the axis of the drive shaft 32 to the axis of the support part 2.

[0021] Due to the rotation of the drive shaft 32, the arm 10 rotates around the axis of the drive shaft 32, and the support parts 1 and 2 also rotate around the axis of the drive shaft 32. As a result, the support parts 1 and 2 also rotate, and one support part 1 can be moved to the supply position (waiting position), and the other support part 2 can be moved to the waiting position (supply position). At this time, the sheet s is fed out from the roll 8 supported by the support part 1 at the supply position and sent toward the surface material on the production line. When the sheet s on the roll 8 runs out, by rotating the drive shaft 32, the arm 10 can be rotated 180°, the support part 1 at the supply position can be moved to the waiting position, and the support part 2 at the waiting position can be moved to the supply position. That is, the moving device 3 can rotate the arm 10 so that each roll 8 and 9 supported by each support part 1 and 2 alternately reaches the supply position and the waiting position. Thereby, a new sheet s is fed out from the roll 9 of the support part 2 and sent toward the surface material on the production line. On the other hand, the used roll 8 is removed from the support part 1 that has moved to the waiting position, and the roll to be used next after the roll 9 can be attached to the support part 1 and waited for.

[0022] As shown in FIGS. 1 to 3, when exchanging the rolls 8 and 9, the sheet cutting device 4 cuts the sheet s fed out from the roll at the supply position toward the surface material. The sheet cutting device 4 includes a cutting part 41, a connecting part 42, a power source 43, and a driving part 44. The cutting part 41 is a wire that generates heat to a temperature higher than the melting point of the sheet s when energized, and is formed of, for example, a nichrome wire with a large resistance. The cutting part 41 is arranged so that its extending direction intersects the supply direction (conveying direction) of the sheet s fed out from the roll 8 at the supply position. The cutting part 41 is arranged to extend in a direction orthogonal to the moving direction of the cutting part 41 by the driving part 44. The cutting part 41 is provided to reciprocate on the supply path of the sheet s. The cutting part 41 is connected to the power source 43 via the connecting part 42. The connecting part 42 connects the cutting part 41 and the power source 43, and is formed from a current-carrying wire. The connecting part 42 is formed from a material with low resistance, and allows the current energized from the power source 43 to flow to the cutting part 41. The connecting part 42 is arranged to extend behind the cutting part 41 so as not to impede the cutting of the sheet s by the cutting part 41.

[0023] Both ends of the cutting part 41 are respectively connected to the power source 43 via the connecting part 42, and when turned ON, current is made to flow to the cutting part 41 via the connecting part 42. The power source 43 supports the cutting part 41 and the connecting part 42 via a housing or the like. The power source 43 is reciprocally movable in one direction by the driving part 44. The driving part 44 cuts the sheet s with the cutting part 41 supported by the power source 43 by reciprocally moving the cutting part 41 and the power source 43 in one direction. The driving part 44 is formed from, for example, a rodless cylinder, and a slider 441 connected to a piston reciprocally moves along a cylinder tube 442. The slider 441 moves along the cylinder tube 442 by pneumatic pressure or magnetic force. The cylinder tube 441 is arranged along the width direction of the sheet s fed out from a roll. That is, the slider 441 reciprocally moves along the width direction of the sheet s. The cutting part 41 and the power source 43 are provided on the upper surface of the slider 441. Thereby, the cutting part 41 moves along the width direction of the sheet s intersecting the supply direction of the sheet s. At this time, the cutting part 41 collides with the sheet s from one end in the width direction of the sheet s, and while melting the sheet s by its own heat generation, moves toward the other end. When the cutting part 41 passes through from one end to the other end of the sheet s, the sheet s is cut. The sheet cutting device 4 is provided at a position where the sheet s fed out from the roll 8 at the supply position can be cut by the cutting part 41 while rotating the arm part 10 and pressing the roll 9 at the standby position against the sheet s fed out from the roll 8, upstream in the feeding direction (transport direction) of the sheet s from the position where it is pressed.

[0024] As shown in FIG. 3, the control unit 5 controls at least the driving of the moving device 3. The control unit 5 drives the motor 31 of the moving device 3 to rotate the drive shaft 32, and rotates the arm 10 connected to the drive shaft 32 about the axis. When replacing the roll 8 with less remaining sheet s with a new roll 9, the control unit 5 moves one roll 9 in the standby position and presses it against the sheet s fed out from the other roll 8 in the supply position to overlap the respective sheets s, and drives the moving device 3 so as to feed out the sheet s from the two rolls 8 and 9 respectively. After the control unit 5 presses the roll 9 against the sheet s fed out from the roll 8 to overlap the sheets s, it temporarily stops the moving device 3. After the sheet s is cut upstream of the overlapped sheets s, it drives the moving device 3 again to move the new roll 9 being pressed to the supply position and move the roll 8 with the sheet s cut to the standby position. When the roll 9 interferes during the cutting of the sheet s by the sheet cutting device 4, the control unit 5 may drive the moving device 3 during the cutting of the sheet s to move the roll 9 slightly toward the standby position or the supply position. The control unit 5 may control the driving of the moving device 3, the sheet cutting device 4, and other devices.

[0025] <Roll replacement method> FIG. 4 is a diagram for explaining a state in which the sheet s is attached to the surface material m conveyed on the production line. The sheet s is fed out from the roll 8 in the supply position and is attached to the surface material m formed on the surface of the steel plate while being guided by a plurality of rollers r. As shown in FIG. 4, when the remaining amount of the sheet s of the roll 8 in the supply position decreases, it is necessary to replace it with a new roll 9 in the standby position. At this time, in order to keep the firing time of each part of the surface material m constant, it is necessary to attach the sheet s to the surface material m without stopping the production line and without cutting the sheet s.

[0026] In such a situation, when replacing roll 8 with roll 9, as shown in FIG. 5, the control unit 5 drives the motor 31 of the moving device 3 and rotates the arm 10 to move the roll 9 in the standby position and press it against the sheet s fed out from the roll 8 in the supply position, overlapping two sheets s, and making the sheets s be fed out from the two rolls 8 and 9 respectively, and then stops the driving of the motor 31. Since paste is applied to one side of each sheet s, the sheets s fed out from the rolls 8 and 9 are conveyed toward the surface material m in a state of being in close contact with each other. At this time, the sheet s fed out from the roll 8 in the supply position is on the moving path of the cutting part 41 of the sheet cutting device 4.

[0027] Next, the power supply 43 is turned on to energize the cutting part 41, and the driving part 44 is driven to move the slider 441 along the cylinder tube 442. On the upstream side of the overlapped sheets s, the sheet s is melted by the heat of the cutting part 41 that generates heat due to energization, and the sheet s is cut along its width direction. When the roll 9 is on the moving path of the sheet cutting device 4 during the cutting of the sheet s by the sheet cutting device 4, the moving device 3 may be driven during the cutting of the sheet s to move the roll 9 slightly toward the standby position or the supply position.

[0028] After the sheet s fed out from the roll 8 is cut, as shown in FIG. 6, the control unit 5 drives the motor 31 of the moving device 3 and rotates the arm 10 to move the roll 9 to the supply position and move the roll 8 to the standby position. As a result, as shown in FIG. 7, the sheet s is supplied from the roll 9 toward the surface material m, and the used roll 8 has moved to the standby position, so it can be replaced with a new roll to be used after the roll 9.

[0029] According to the sheet feeding device 100 as described above, when replacing the roll 8 with a small remaining amount of sheet with a new roll 9, the roll 9 in the standby position is moved and pressed against the sheet s fed out from the roll 8 in the supply position, and the respective sheets s are overlapped in two layers. The sheets s are fed out from the two rolls 8 and 9 respectively, and the movement of each of the rolls 8 and 9 is temporarily stopped. Then, the power supply 43 of the sheet cutting device 4 is turned on to energize the cutting part 41, and the driving part 44 is driven to move the slider 441 along the cylinder tube 442. On the upstream side of the overlapped sheets s, the sheets s are melted by the heat of the cutting part 41 that generates heat due to energization, and are cut along the width direction of the sheets s. After the sheet s fed out from the roll 8 is cut, by further rotating the arm part 10, the roll 9 can be moved to the supply position and the roll 8 can be moved to the standby position, so that the roll replacement can be easily performed. In this way, it is no longer necessary for the operator to check the remaining amount of the sheet on the roll 8, manually cut the sheet s, and overlap and connect the sheet s of the new roll 9 to the last part of the cut sheet s in a short time. That is, it is only necessary to turn on the power supply 43 of the sheet cutting device 4 at the timing of cutting the sheet s. Therefore, regardless of the skill level of the operator, the roll replacement of the sheet s can be smoothly performed without stopping the production line.

[0030] <Others> As described above, the preferred embodiments of the present invention have been described. However, the present invention is not limited to the above embodiments, and includes all aspects included in the concept and claims of the present invention. Also, each configuration may be selectively combined as appropriate so as to achieve at least part of the above-described problems and effects. Further, for example, the shape, material, arrangement, size, etc. of each component in the above embodiments can be appropriately changed according to the specific usage mode of the present invention. For example, in addition to driving and controlling the moving device 3, the control unit 5 may also control the driving of the sheet cutting device 4. Specifically, the control unit 5 drives the sheet cutting device 4 to cut the sheet s being fed out from the roll 8 at the supply position on the upstream side of the stacked sheets s. The driving control of the sheet cutting device 4 includes, for example, energization control of the cutting unit 41 by turning the power supply 43 on / off, driving control of the slider 441 of the driving unit 44, etc. When the sensor detects the remaining amount of the sheet on the roll 8 at the supply position and detects that the remaining amount of the sheet has reached or fallen below a predetermined amount, the control unit 5 turns on the power supply 43 and causes the slider 441 to move.

Explanation of Reference Numerals

[0031] 1 First support part 2 Second support part 3 Moving device 31 Motor 32 Driving shaft 4 Sheet cutting device 41 Cutting part 42 Connection part 43 Power supply 44 Driving part 441 Slider 442 Cylinder tube 5 Control unit 8 Roll 9 Roll 10 Arm part 100 Sheet feeding device m Surface material r Roller s Sheet

Claims

1. A sheet cutting device for cutting a supplied sheet, comprising: a cutting part provided on the supply path of the sheet and generating heat at a temperature higher than the melting point of the sheet by energization; a power source for energizing the cutting part; a drive part for reciprocating the cutting part in a direction intersecting the supply direction of the sheet; A sheet cutting device characterized by comprising the above.

2. The sheet cutting device according to claim 1, wherein the cutting part is a nichrome wire.

3. The sheet cutting device according to claim 1 or 2, wherein the extending direction of the cutting part is perpendicular to the moving direction of the cutting part.

4. A sheet supply device for supplying a sheet attached to the surface of an object to be protected toward the object to be protected, comprising: a first support part for supporting a first roll around which the sheet is wound in a roll shape; a second support part for supporting a second roll around which the sheet is wound in a roll shape; a moving device for moving one of the first support part and the second support part to a supply position and moving the other to a standby position; the sheet cutting device according to claim 1; and a control part for controlling the driving of the moving device, wherein the control part moves one roll in the standby position to press against the sheet fed from the other roll in the supply position to stack the respective sheets on top of each other, and drives the moving device so as to feed sheets from the two rolls respectively; The sheet supply device is characterized in that the sheet cutting device is provided at a position for cutting the sheet fed from the other roll on the upstream side of the stacked sheets.

5. The sheet supply device according to claim 4, wherein the control part drives the moving device so that the one roll is moved to the supply position after the sheet cutting device cuts the sheet fed from the other roll on the upstream side of the stacked sheets.

6. The sheet supply device according to claim 4 or 5, wherein the control part drives the sheet cutting device so as to cut the sheet fed from the other roll on the upstream side of the stacked sheets.

7. comprising an arm part for supporting the first support part and the second support part, The sheet supply device according to claim 4 or 5, wherein the moving device rotates the arm part so that each roll supported by each support part alternately reaches the supply position and the standby position.

8. A roll replacement method using the sheet feeding device according to claim 4, comprising: moving one of the rolls in the standby position and pressing it against the sheet fed from the other roll in the supply position so as to overlap the respective sheets in two layers, and feeding the sheets from the two rolls respectively; driving the sheet cutting device to cut the sheet fed from the other roll on the upstream side of the overlapped sheets; after cutting the sheet, moving the one roll to the supply position; A roll replacement method characterized by comprising the above steps.

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