Sheet cutting device and sheet cutting method

Abstract

To provide a sheet cutting device and method capable of facilitating operation by man power without utility such as electrical power and air or the like, and reducing a work load.SOLUTION: A sheet cutting device 1 comprises: a supply part 20 supporting a roll-shaped sheet; a feeding part 30 which has a handle 34 for rotating a pair of rollers, has a clamp lever 33 capable of selecting clamp of a sheet, clamps the sheet and rotates the handle 34 for feeding the sheet in a prescribed direction; and a cutting part 40 cutting the sheet along a width direction. The cutting part 40 has a guide rail 44 provided along a width direction of the sheet, a slide cutter 43 which has a cutter blade capable of parallel translation, a guide rail 46 and a slide lever 45 which is made to perform parallel translation for operating the slide cutter 43. The sheet cutting device is provided with a tension generation part that, when the slide lever 45 is not operated, returns the slide cutter 43 to an initial position.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an apparatus for unwinding a rolled sheet by a predetermined length and cutting it in the width direction. [Background technology]

[0002] In the printing process, in order to protect the surface of printing cylinders during transportation, rolled wrapping paper or other sheets are cut to a specified length and used to cover the printing cylinders. The width of some of the sheets can exceed 2m, and the task of fixing such a wide sheet roll in a specified position, unwinding the leading edge, and cutting it with a cutter or other tool by an operator is a heavy workload and poses health and safety issues, such as the risk of injury from the cutter blade.

[0003] On the other hand, Patent Document 1 describes a cutting device for a paper or film packaging device, which is characterized in that a slide plate housing a cutter is configured to slide alternately left and right on a rail of a base via a pulley transmission mechanism in response to a command from a control device via a microswitch when a start switch is operated, and the rotation speed of the rotating roller can be appropriately adjusted by pressing the support plate with an adjustment screw, thereby enabling the paper or film to be automatically cut. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2000-72118 A Summary of the Invention [Problem to be solved by the invention]

[0005] In Patent Document 1, the film is automatically cut using the power of a motor or the like, but the work of winding wrapping paper or the like around a printing cylinder is often carried out in the open space of a warehouse or factory, and there is a possibility that utilities such as power and air cannot be sufficiently secured. In addition, when a motor or other device is used, the manufacturing cost of the cutting device increases, and costs such as motor maintenance are incurred. Furthermore, there is a possibility that the device may not function satisfactorily when needed due to a breakdown or the like.

[0006] The present disclosure has been made in consideration of the above-mentioned circumstances, and has an objective of providing a sheet cutting device and a sheet cutting method that can be easily operated manually even without utilities such as electricity or air, and that can reduce the workload. [Means for solving the problem]

[0007] The sheet cutting device according to the present embodiment includes a supply unit that rotatably supports a roll-shaped sheet, a pair of rollers and a handle that rotates one of the rollers, and a clamp lever that can select whether the pair of rollers clamp the sheet or not, a feed unit that operates the clamp lever to clamp the sheet and turn the handle to sandwich the sheet between the pair of rollers and feed it in a predetermined direction, and a cutting unit that cuts the sheet along the width direction, the cutting unit includes a first guide rail provided along the width direction of the sheet and a slide cutter having a cutter blade that can move parallel to the first guide rail, and a second guide rail and a slide lever that moves parallel to the second guide rail to operate the slide cutter, and a movement amount conversion unit that is set so that the movement amount of the slide cutter is greater than the movement amount of the slide lever in correspondence with the movement amount of the slide lever, and a tension generating unit is attached to one end of the slide cutter so that the slide cutter returns to its initial position when the slide lever is not operated.

[0008] In addition, in a sheet cutting device according to another embodiment of the present invention, the movement amount conversion unit includes a pulley having a first stage and a second stage having a larger diameter than the first stage, and a first wire and a second wire wound around the first stage and the second stage of the pulley, respectively, one ends of the second wire and the first wire are fixed to the slide cutter and the slide lever, respectively, and as the slide cutter and the slide lever move, the second wire and the first wire are wound around one of the second stage and the first stage of the pulley, respectively, and are unwound from the other, and the ratio of the movement amounts of the slide cutter and the slide lever may be the ratio of the diameters of the second stage and the first stage of the pulley.

[0009] In addition, in a sheet cutting device according to another embodiment of the present invention, the tension generating unit includes a load converting unit having a plurality of fixed pulleys and one or more movable pulleys, and having a predetermined weight that can move integrally with the movable pulley, and a third wire that is hung on the fixed pulley and the movable pulley, one end of the third wire is fixed to the slide cutter in a direction opposite to the first wire, and the other end is fixed to any part of the housing, and when the slide lever is not operated, the slide cutter returns to the initial position due to a load corresponding to the load of the weight.

[0010] In addition, in the sheet cutting device according to another embodiment of the present invention, the arrangement of the handle and the clamp lever and the range of movement of the slide lever may be within the area of ​​a sphere having a diameter of 2 m.

[0011] In addition, the sheet cutting device according to another embodiment of the present invention may further include a pressing unit on the opposite side of the first guide rail from the pair of rollers, the pressing unit being composed of a flat plate or a roller that presses the sheet from above with a constant load.

[0012] The sheet cutting method according to the present embodiment includes a sheet positioning step of positioning a roll-shaped sheet so that it can rotate freely, a feeding step of clamping the sheet with a pair of rollers and feeding it in a predetermined direction, and a cutting step of cutting the sheet along the width direction, the cutting step including a first guide rail provided along the width direction of the sheet, a slide cutter having a cutter blade that can move parallel to the first guide rail, and a second guide rail and a slide lever that moves parallel to the second guide rail to operate the slide cutter, the amount of movement of the slide cutter being set to correspond to the amount of movement of the slide lever and to be greater than the amount of movement of the slide lever, and when the slide lever is not operated, the slide cutter and the slide lever each return to their initial positions, and at a cutting section, the slide lever is moved parallel to the second guide rail, causing the slide cutter to move parallel to the first guide rail to cut the sheet. Effect of the Invention

[0013] According to the present embodiment, it is possible to provide a sheet cutting device and a sheet cutting method that can be easily operated manually without utilities such as electricity or air, and that can reduce the workload. [Brief description of the drawings]

[0014] [Figure 1] 1 is a schematic perspective view illustrating an example of a sheet cutting device according to an embodiment of the present disclosure. [Diagram 2] 11 is a side view illustrating the sheet cutting device as viewed from the +Y direction. FIG. [Diagram 3] 1 is a plan view illustrating a sheet cutting device as viewed from the +Z direction. FIG. [Figure 4] FIG. 4 is a diagram illustrating a configuration of a movement amount conversion unit. [Diagram 5] 4A and 4B are diagrams illustrating a configuration of a load conversion unit. [Figure 6]FIG. 4 is a flow diagram illustrating an example of a sheet cutting method according to an embodiment of the present disclosure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] Hereinafter, an example of a sheet cutting device and a sheet cutting method according to the present disclosure will be described with reference to the drawings, etc. However, the sheet cutting device and the sheet cutting method according to the present disclosure are not limited to the device and the method according to the embodiment described below.

[0016] The figures shown below are schematic. Therefore, the size, shape, thickness of each layer in the cross-sectional view, etc. are appropriately exaggerated to facilitate understanding. In addition, hatching showing the cross section of the member is appropriately omitted in each figure. The numerical values ​​of the dimensions and material names of each member described in this specification are examples of embodiments, and are not limited to these and can be appropriately selected and used. In this specification, terms that specify the shape or geometric conditions, such as parallel, orthogonal, and vertical, are intended to include substantially the same state in addition to their strict meaning. In addition, for convenience of explanation, the terms "upper" or "lower" may be used in the description relative to the paper, but the up-down direction may be reversed, and the same applies to the left-right direction.

[0017] 1. Embodiments of the present disclosure A typical embodiment of the sheet cutting device of the present disclosure will be described. Here, for convenience of describing the sheet cutting device 1, an XYZ coordinate system is provided. In the sheet cutting device 1, a Y axis is provided along the axial direction of the sheet roll 200, and a Z axis is provided along the vertical direction. In addition, an X axis perpendicular to the Y axis and the Z axis is provided. The direction of the Y axis from the machine side where the clamp lever 33 and the handle 34 are not provided to the operator side where the clamp lever 33 and the handle 34 are provided is the +Y direction side, and the opposite direction is the -Y direction side. In addition, when the +Y direction is viewed to the right, the direction toward the front side is the +X direction side, the opposite direction is the -X direction side, the vertical upward direction is the +Z direction side, and the vertical downward direction is the -Z direction side.

[0018] As an example, the sheet cutting device 1 is a device that cuts a sheet of protective wrapping paper that covers a printing cylinder plate used in a printing machine to a predetermined length. A sheet such as wrapping paper is wound up as a sheet roll 200. As shown in Figures 1, 2(a) and 2(b), the sheet roll 200 is rotatably supported from below by a supply unit 20 composed of a plurality of support rollers 21, 22, etc., and the sheet 210 can be easily unwound by simply pulling the leading end of the sheet 210 by hand.

[0019] The sheet cutting device 1 also has a pair of rollers 31, 32 arranged vertically above the supply unit 20, a handle 34 for rotating one of the rollers, and a clamp lever 33 that can select whether the pair of rollers 31, 32 clamp the sheet 210. These are collectively referred to as the pay-out unit 30. By operating the clamp lever 33 so as to clamp the sheet 210 and turning the handle 34, the sheet 210 is sandwiched between the pair of rollers 31, 32 and paid out in a predetermined direction.

[0020] The sheet cutting device 1 also includes a cutting section 40 that cuts the sheet 210 in the width direction, i.e., the Y-axis direction. The cutting section 40 is composed of a slide cutter section 41 and a slide lever section 42. The slide cutter section 41 includes a guide rail 44 that is a first guide rail provided along the width direction of the sheet 210, and a slide cutter 43 having a cutter blade 43a that can move in parallel along the first guide rail. On the other hand, the slide lever section 42 includes a guide rail 46 that is a second guide rail, and a slide lever 45 that moves in parallel along the second guide rail to operate the slide cutter 43.

[0021] Here, the sheet cutting device 1 includes a movement amount conversion unit 60 that is set so that the movement amount of the slide cutter 43 along the width direction of the sheet 210 is larger than the movement amount of the slide lever 45 in correspondence with the movement amount of the slide lever 45. The movement amount conversion unit 60 is disposed, for example, on the side surface on the +Y direction side of the housing 10 of the sheet cutting device 1. This allows the movement amount of the slide cutter 43 to be set to be three times the movement amount of the slide lever 45, for example. At this time, if the slide lever 45 is translated 600 mm along the width direction, the slide cutter 43 can translate 1,800 mm. In other words, the sheet 210 can be cut by this distance.

[0022] The movement amount conversion unit 60 will be described in detail later. A tension generating unit is attached to one end of the slide cutter 43 so that the slide cutter 43 returns to its initial position when the slide lever 45 is not operated. An example of the tension generating unit is the load conversion unit 70, but it can also be realized by a rubber band, a spring, or the like. The load conversion unit 70 is disposed, for example, on the side surface on the -Y direction side of the housing 10 of the sheet cutting device 1. This will also be described in detail later.

[0023] The sheet cutting device 1 of this embodiment, with the above configuration, can be easily operated manually without utilities such as electricity and air, and can reduce the workload. The configuration of each part of the sheet cutting device 1 will be described in detail below.

[0024] [a] Configuration of sheet cutting device [i] Supply section Two rotatable support rollers 21 and 22 are attached as the supply unit 20 to a housing 10, which is a frame structure of the sheet cutting device 1 and is shown by a broken line in Fig. 1, Fig. 2(a) and Fig. 2(b), so that their rotation axes are aligned with the Y axis. The support rollers 21 and 22 are arranged relatively below the sheet cutting device 1, so that the workload of placing the sheet roll 200 thereon can be reduced. For example, the axial centers of the support rollers 21 and 22 are arranged to be within 300 mm from the floor surface. In this embodiment, the sheet roll 200 is supported by two long rollers as the support rollers, but this is not limited thereto, and small rollers such as casters may be arranged at the four corners below the sheet roll 200.

[0025] By arranging the support rollers 21 and 22 below the sheet cutting device 1 in this manner, an operator does not need to transfer the sheet roll 200 using a crane or the like. Then, one end of the sheet roll 200 placed on the floor surface is first tilted and placed on the support rollers 21 and 22, and then the other end is placed on the support rollers 21 and 22. This allows even a single operator to easily set the sheet roll 200 in the supply section 20 without using the power of a crane or the like. The sheet roll 200 can be freely rotated in conjunction with the rotation of the support rollers 21 and 22, and the sheet 210 can be easily pulled out by pulling it by hand.

[0026] [ii] Payout section As shown in Fig. 1, Fig. 2(a) and Fig. 2(b), a pair of rollers 31, 32 arranged vertically side by side are disposed in the housing 10 above the supply unit 20 of the sheet cutting device 1. One of the pair of rollers is, for example, the lower payout roller 31, and the other is, for example, the upper nip roller 32. The nip roller 32 functions as a rotatable roller or a brake roller, and when the clamp lever 33 is tilted to one side, the nip roller 32 comes into contact with the payout roller 31. Also, when the clamp lever 33 is tilted to the other side, the nip roller 32 moves away from the payout roller 31.

[0027] Pay-out roller 31 rotates in conjunction with the rotational movement of handle 34. If the shaft of handle 34 is directly connected to the shaft of pay-out roller 31, pay-out roller 31 rotates at the same rotation angle as the rotation angle of handle 34. In addition, if the shaft of handle 34 and the shaft of pay-out roller 31 are connected via gears or pulleys of different diameters, pay-out roller 31 rotates at a rotation angle that is a fixed ratio to the rotation angle of handle 34.

[0028] In actual operation, first, clamp lever 33 is operated so that nip roller 32 moves away from pay-out roller 31, and the leading edge of sheet 210, which has been pulled up by hand, is passed between nip roller 32 and pay-out roller 31. Thereafter, clamp lever 33 is operated so that nip roller 32 moves closer to pay-out roller 31, and the amount of sheet 210 paid out is adjusted by operating handle 34. Furthermore, if sheet 210 becomes wrinkled or meanders, clamp lever 33 is operated so that nip roller 32 moves away from pay-out roller 31.

[0029] The sheet 210 may be unwound by rotating the handle 34 by hand as described above, but when it is necessary to cut a large number of sheets 210 continuously, the sheet 210 may be unwound not by hand but by the rotational power of a hand drill, for example. In this case, a square or hexagonal recess is provided in the portion corresponding to the handle 34, and a corresponding square or hexagonal protrusion is provided on the cutting edge of the hand drill, and the recess and the protrusion can be fitted together to rotate the hand drill. In this way, even in an environment without a power supply such as an outlet, a charged hand drill can be brought in and the sheet 210 can be unwound automatically.

[0030] [iii] Cutting section As shown in FIG. 1, FIG. 2(a) and FIG. 2(b), a cutting section 40 separated into a slide cutter section 41 and a slide lever section 42 is disposed downstream of the sheet 210 conveyance from the unwinding section 30 of the sheet cutting device 1, i.e., on the +X direction side from the unwinding section 30, with respect to the housing 10. The slide cutter section 41 includes a guide rail 44 along the Y axis direction, and a slide cutter 43 supported so as to be movable in parallel along the Y axis direction with respect to the guide rail 44. A cutter blade is disposed downward on the lower side of the slide cutter 43, i.e., on the -Z direction side, and can cut the sheet 210 disposed below the cutter blade in the width direction. It is preferable to use a cutter blade that has been provided with safety measures such as a commercially available safety cutter or a string cutting cutter, the periphery of which is covered with a protective material.

[0031] On the other hand, the slide lever section 42 includes a guide rail 46 along the Y-axis direction and a slide lever 45 supported so as to be movable in parallel with the guide rail 46 along the Y-axis direction. The slide lever 45 can be moved by a worker by gripping it and moving it along the guide rail 46, thereby moving the slide cutter 43 by a predetermined amount corresponding to the amount of movement. The amount of movement of the slide cutter 43 along the width direction of the sheet 210 is greater than the amount of movement of the slide lever 45. In addition, since the slide lever section 42 is disposed apart from the slide cutter section 41 along the X-axis direction, the slide lever 45 and the slide cutter 43 are also disposed apart, so that the slide lever 45 can be safely operated. Furthermore, since the cutting work can be performed by simply moving the slide lever 45 in parallel with the arm by bending and straightening it, the workability and safety are significantly improved compared to the conventional work in which the cutter blade is held in the hand and cut manually.

[0032] FIG. 3 is a plan view of the sheet cutting device 1 for explaining the movement of the slide cutter 43 and the slide lever 45. First, the slide cutter 43 and the slide lever 45 are both set to the initial position as shown in FIG. 3(a). The slide cutter 43 is disposed at a first position on a straight line X1 along the X axis, where the cutter blade 43a is on the -Y direction side of the left end of the sheet 210. This is the initial position of the slide cutter 43. Also, as shown in FIG. 3(b), the slide cutter 43 can move to a second position on a straight line X3 along the X axis, where the cutter blade 43a is on the +Y direction side of the right end of the sheet 210. This is the cutting completion position of the slide cutter 43 on the sheet 210.

[0033] On the other hand, as shown in FIG. 3(a), the slide lever 45 is disposed at a third position where its center along the Y axis is on a straight line X2 along the X axis. The straight line X2 is a position sandwiched between straight lines X1 and X3. The third position is the initial position of the slide lever 45. Also, as shown in FIG. 3(b), the slide lever 45 can move to a fourth position where its center along the Y axis is on the straight line X3. This is an operation completion position of the slide lever 45 corresponding to the cutting completion position of the sheet 210 of the slide cutter 43. However, the centers of the fourth position and the second position do not have to be disposed on the same straight line along the X axis, and may be shifted from each other along the Y axis direction.

[0034] In addition, in this embodiment, the guide rail 46 is arranged substantially parallel to the guide rail 44 along the Y axis, but the guide rail 46 does not have to be arranged substantially parallel to the guide rail 44. For example, the guide rail 46 may be arranged so that its axis is included in the XZ plane on the operator side of the housing 10. However, by arranging the guide rail 46 substantially parallel to the guide rail 44 along the Y axis, the operator can recognize that the operation direction of the slide lever 45 and the movement direction of the cutter blade 43a are the same direction. This allows the operator to intuitively get a pseudo feeling of directly operating the cutter blade 43a by himself, and can suppress operation errors and the like.

[0035] Here, the moving distance when the slide cutter 43 moves from the first position to the second position is d1, and the moving distance when the slide lever 45 moves from the third position to the fourth position is d2. At this time, d1 / d2 is a predetermined ratio larger than 1, for example, 3. As shown in FIG. 3(a) and FIG. 3(b), wires W11 and W12 are fixed to one end of the slide cutter 43 on the -Y direction side and the other end on the +Y direction side, respectively. In addition, a wire W21 is fixed to one end of the slide lever 45 on the -Y direction side. The wire W11 passes through a load conversion unit 70 described later, and the wires W12 and W21 are wound around a pulley 62 of a movement amount conversion unit 60 described later. The wires W11, W12, and W21 may be metal wires, resin wires, strings, rubber strings, etc.

[0036] In addition, when considering the operability when each operation of the sheet cutting device 1 is performed by one person, it is preferable that the arrangement of the handle 34 and the clamp lever 33 that are directly operated by the worker, and the movement range of the slide lever 45 are within the area of ​​a sphere with a diameter of 2 m. This further improves the operability of the worker working alone. In this embodiment, the handle 34 and the clamp lever 33 are arranged near the XZ plane at the end of the +Y direction side that is the operator side of the housing 10, and the movement range of the slide lever 45 is also set to an area closer to the +Y direction of the guide rail 46, so that these are within the area of ​​a sphere with a diameter of 2 m.

[0037] [iv] Movement amount conversion section The configuration of the movement amount conversion unit 60 is shown in Figures 4(a) and 4(b). These figures are schematic perspective views showing a housing 61 which is the frame structure of the movement amount conversion unit 60, a pulley 62 which is a two-stage pulley, and wires W21 and W12 wound around it. The pulley 62 is composed of a first stage 62a around which the wire W21 is wound, and a second stage 62b around which the wire W12 is wound and has a larger diameter than the first stage 62a. The diameter of the second stage 62b is, for example, three times that of the first stage 62a.

[0038] The configuration of the movement amount conversion unit 60 is shown in Figures 4(a) and 4(b). These figures are schematic perspective views showing a pulley 62, which is a two-stage pulley constituting the movement amount conversion unit 60, and the wires W21 and W12 wound around it. The pulley 62 is composed of a first stage 62a around which the wire W21 is wound, and a second stage 62b, which has a larger diameter than the first stage 62a and around which the wire W12 is wound. The diameter of the second stage 62b is, for example, three times that of the first stage 62a.

[0039] When the slide lever 45 is moved from the third position, which is the initial position, to the fourth position, the slide lever 45 pulls the wire W21 in the +Y direction. As a result, as shown in FIG. 4(a), the wire W21 wound around the first step 62a is unwound, and conversely, the wire W12 is wound around the second step 62b and pulled. This force moves the slide cutter 43 along the Y axis direction from the first position, which is the initial position, to the second position. That is, the state shown in FIG. 3(b) is reached.

[0040] On the other hand, when the slide lever 45 that has moved to the fourth position is released, the torque by W21 to rotate the pulley 62 disappears. As a result, the wire W12 is pulled by the tensile load from the load conversion unit 70 described later on the second step 62b of the pulley 62, generating a torque in the opposite direction and rotating the pulley 62. As a result, as shown in FIG. 4(b), the wire W12 wound around the second step 62b is unwound, and conversely, the wire W21 is wound around the first step 62a and pulled. This force pulls the slide lever 45 back to the third position, which is the initial position, and the slide cutter 43 is also pulled back to the first position, which is the initial position. That is, the state of FIG. 3(a) is reached. The ratio of the movement amount of the slide cutter 43 and the slide lever 45 is the same as the ratio of the diameters of the second step 62b and the first step 62a of the pulley 62.

[0041] Although the pulley 62 is configured with two stages, the first stage 62a and the second stage 62b, the pulley is not limited to this, and may be configured with a combination of three or more stages with different diameters. In this case, the combination of two stages to be used among the three or more stages may be determined depending on the type of sheet, etc., and the wire may be replaced. Also, a plurality of types of two-stage pulleys with different diameter combinations may be prepared, and the pulley to be used may be replaced depending on the type of sheet, etc. In this way, the ratio of the movement amount of the slide cutter 43 and the slide lever 45 can be finely changed depending on the type of sheet (width, length, weight), etc., and the workability can be further improved.

[0042] Furthermore, the movement amount conversion unit 60 may be configured with something other than a pulley. For example, a stepped gear may be provided instead of the pulley 62, or two gears with different diameters may be arranged opposite each other, and a chain that meshes with these gears may be provided instead of the wires W12 and W21.

[0043] [v] Load conversion section The configuration of the load conversion unit 70 is shown in Fig. 5(a) and Fig. 5(b). These figures include each element constituting the load conversion unit 70. The elements include a housing 71 which is a frame structure of the load conversion unit 70, four fixed pulleys 72a, 72b, 72c, and 72d which are fixed pulley units 72 on the upper side, and three movable pulleys 73a, 73b, and 73c which are movable pulley units 73 on the lower side. The elements further include a predetermined weight 74 which is fixed integrally with the movable pulley 73, and a wire W11 which is hung on the fixed pulley 72 and the movable pulley 73. One end of the wire W11 is fixed to the slide cutter 43 in a direction opposite to the wire W12, and the other end is fixed to any one of the housings 10.

[0044] First, as shown in Fig. 3(b), when the slide lever 45 is moved from the third position, which is the initial position, to the fourth position, the slide lever 45 pulls the wire W21. As a result, as shown in Fig. 5(a), the movable pulley 73 and the weight 74 are both lifted upward. Incidentally, since there are three movable pulleys 73 in this embodiment, if the load of the movable pulley is 0 and the load of the weight is P, the load acting as resistance when the slide lever 45 is moved by the wire W11 is P / 6.

[0045] On the other hand, when the slide lever 45 that has moved to the fourth position is released, the torque by W21 to rotate the pulley 62 disappears. As a result, only the tensile load from the load conversion unit 70 is applied to the second step 62b of the pulley 62, and the wire W11 is pulled. This generates torque, causing the pulley 62 to rotate. As a result, the slide lever 45 and the slide cutter 43 are pulled back to their initial positions, as described above.

[0046] Although the load conversion unit 70 has been described as being configured by a combination of a fixed pulley, a movable pulley, and a weight, a rubber band or a spring material may be used instead of the wire W11. The tip of the wire W11 may be hung on one fixed pulley and fixed to a weight hanging down. Furthermore, the attractive force of a strong permanent magnet may be used. In either case, the slide cutter 43 can be returned to the initial position. However, in the load conversion unit 70 of this embodiment, the number and positions of the fixed pulleys and the movable pulleys can be adjusted to finely adjust the speed at which the slide cutter 43 is returned to the initial position and the resistance load at which the slide lever 45 is moved from the initial position, thereby improving workability.

[0047] [vi] Clamp As shown in Figures 1, 2(a) and 2(b), the sheet cutting device 1 further includes a pressing unit 50 that presses the sheet 210 from above with a constant load, located downstream of the slide cutter unit 41 of the cutting unit 40 in the conveyance direction of the sheet 210, i.e., on the opposite side of the pair of rollers 31, 32 of the guide rail 44. The pressing unit 50 includes a clamp bar 51 made of a flat plate or a roller. The pressing unit 50 can be composed of, for example, a guide roller 52 arranged on the lower side and a flat clamp bar 51 arranged on the upper side that is vertically movable.

[0048] The pressing unit 50 is provided to prevent the cut sheet 220 cut by the cutting unit 40 from dropping, shifting during transport, bending, etc., caused by vibrations during cutting, by the weight of the clamp bar 51, and to ensure stable handling of the cut sheet 220. A flexible member such as rubber or sponge may be attached to the underside of the clamp bar 51. This makes it possible to more effectively prevent deformation such as bending due to vibrations during cutting of the sheet 210.

[0049] In this embodiment, as shown by the dashed lines in Figures 1, 2(a) and 2(b), a collapsible sheet storage table 110 is further provided at the end of the housing 10 closest to the +X direction. By raising the sheet storage table 110 and making its main surface approximately parallel to the XY plane, multiple cut sheets 220 can be placed in a stack on the sheet storage table 110, and longer sheets can also be rolled up while being placed, further improving workability.

[0050] [b] How to cut the sheet Next, a method for cutting the sheet 210 wound around the sheet roll 200 to a predetermined length in the width direction using the above-mentioned sheet cutting device 1 will be described mainly with reference to the flow chart of FIG.

[0051] First, the sheet roll 200, on which a sheet 210 such as wrapping paper is wound in a roll shape, is set in the supply unit 20 (step S301 in FIG. 6). As described above, the support rollers 21 and 22 of the supply unit 20 are disposed relatively below the sheet cutting device 1, so that even a single worker can easily place the sheet roll 200 on the support rollers 21 and 22. This allows the sheet roll 200 to rotate freely. This is called the sheet placement process.

[0052] Next, the sheet 210 is pulled out from the sheet roll 200 and passed between the pair of rollers of the pay-out section 30, that is, the pay-out roller 31 and the nip roller 32 (step S302). Then, the clamp lever 33 is operated to clamp the sheet 210 (step S303). Furthermore, in this state, the handle 34 is turned to pay out the sheet 210 in the +X direction while it is sandwiched between the pair of rollers (step S304). This is the pay-out process.

[0053] Next, the sheet 210 is cut along the width direction (step S305). This is referred to as a cutting process. The cutting process is performed by operating the slide lever 45 of the cutting unit 40 as follows. First, the cutting unit 40 includes a guide rail 44 provided along the width direction of the sheet 210 and a slide cutter 43 having a cutter blade 43a that can move in parallel along the guide rail 44. The cutting unit 40 also includes a guide rail 46 and a slide lever 45 that moves in parallel along the guide rail 46 to operate the slide cutter 43. The amount of movement of the slide cutter 43 is set to be larger than the amount of movement of the slide lever 45 in correspondence with the amount of movement of the slide lever 45. For example, the amount of movement of the slide cutter 43 can be set to be three times the amount of movement of the slide lever 45.

[0054] When the slide lever 45 is not operated, that is, when the hand is released from the slide lever, the slide cutter 43 and the slide lever 45 each return to their initial positions (step S306). If cutting of the sheet 210 is to be repeated, the above-mentioned operations from the unwinding step are repeated (steps S307 and S304). When cutting of the sheet 210 is to be completed, the clamp lever 33 is operated to separate the nip roller 32 from the unwinding roller 31, thereby releasing the clamp of the sheet 210 (step S308). Then, the sheet roll 200 is removed to complete the operation.

[0055] As described above, the sheet cutting device 1 of this embodiment includes the supply unit 20 that rotatably supports the roll-shaped sheet roll 200. The sheet cutting device 1 also includes the unwinding unit 30 that clamps the sheet 210 between the pair of rollers 31, 32 and unwinds the sheet 210 in a predetermined direction by operating the clamp lever 33 to clamp the sheet 210 and turning the handle 34. The handle 34 rotates the pair of rollers 31, 32 or either one of the rollers. The clamp lever 33 also makes it possible to select whether or not the pair of rollers 31, 32 clamps the sheet 210.

[0056] The sheet cutting device 1 also includes a cutting section 40 that cuts the sheet 210 along the width direction. The cutting section 40 includes a guide rail 44 that is a first guide rail provided along the width direction of the sheet 210, and a slide cutter 43 that has a cutter blade 43a that can move in parallel along the first guide rail. The cutting section 40 also includes a guide rail 46 that is a second guide rail, and a slide lever 45 that moves in parallel along the second guide rail to operate the slide cutter 43. Here, the sheet cutting device 1 includes a movement amount conversion section 60 that is set so that the movement amount of the slide cutter 43 is larger than the movement amount of the slide lever 45 in correspondence with the movement amount of the slide lever 45. Furthermore, in the sheet cutting device 1, a tension generating section such as a load conversion section 70 is attached to one end of the slide cutter 43 so that the slide cutter 43 returns to its initial position when the slide lever 45 is not operated.

[0057] By providing the sheet cutting device 1 of this embodiment with the above configuration, manual operation is easy and the workload can be reduced even without utilities such as electricity and air. That is, by using the configuration exemplified by the movement amount conversion unit 60 or other configurations, a long distance of a wide sheet can be easily cut by moving the slide lever 45 a short distance. Furthermore, by using the configuration of the tension generation unit exemplified by the load conversion unit 70 or other configurations, the slide lever 45 and the slide cutter 43 can be easily automatically returned to their initial positions after cutting. [Explanation of symbols]

[0058] 1 Sheet cutting device 10. Chassis 20 Supply section 21, 22 Support roller 30 Payout section 31 Payout roller 32 Nip roller 33 Clamp lever 34 Handle 40 Cut section 41 Slide cutter section 42 Slide lever part 43 Slide cutter 43a Cutter blade 44 Guide rail 45 Slide lever 46 Guide Rail 50 Holding part 51 Clamp bar 52 Guide roller 60 Movement amount conversion section 61 Case 62 Pulley 62a 1st stage 62b Second stage 70 Load conversion section 71 Case 72 Fixed pulley section 72a, 72b, 72c, 72d fixed pulley 73 Moving pulley section 73a, 73b, 73c, 73d movable pulley 74 Weight 75 fixed point 110 Seat storage stand 200 sheet rolls 210 seats 220 Cut Sheet

Claims

1. A supply unit that rotatably supports a roll-shaped sheet; a feed section having a pair of rollers and a handle for rotating one of the rollers, and a clamp lever for selecting whether or not the pair of rollers clamp the sheet, and by operating the clamp lever to clamp the sheet and by turning the handle, the sheet is sandwiched between the pair of rollers and fed in a predetermined direction; a cutting unit that cuts the sheet along a width direction, the cutting section includes a first guide rail provided along the width direction of the sheet, a slide cutter having a cutter blade that can move parallel to the first guide rail, and a second guide rail and a slide lever that moves parallel to the second guide rail to operate the slide cutter; a movement amount conversion unit that converts a movement amount of the slide cutter into a movement amount of the slide lever and sets the movement amount of the slide cutter to be larger than the movement amount of the slide lever; A sheet cutting device, wherein a tension generating unit is attached to one end of the slide cutter so that the slide cutter returns to an initial position when the slide lever is not operated.

2. The movement amount conversion unit includes a pulley having a first stage and a second stage having a larger diameter than the first stage; a first wire and a second wire wound around the first stage and the second stage of the pulley, respectively; one end of the second wire is fixed to the slide cutter and one end of the first wire is fixed to the slide lever, With the movement of the slide cutter and the slide lever, the second wire and the first wire are wound around one of the second stage and the first stage of the pulley, respectively, and are unwound from the other stage.

2. The sheet cutting device according to claim 1, wherein a ratio of the travel of the slide cutter and the slide lever is a ratio of diameters of the second stage and the first stage of the pulley.

3. The tension generating unit includes a load converting unit having a plurality of fixed pulleys and one or a plurality of movable pulleys, and a predetermined weight that is movable integrally with the movable pulley; a third wire hung between the fixed pulley and the movable pulley; One end of the third wire is fixed to the slide cutter in a direction opposite to the first wire, and the other end is fixed to any one of the housings, The sheet cutting device according to claim 2 , wherein when the slide lever is not operated, the slide cutter returns to the initial position by a load corresponding to the load of the weight.

4. 4. The sheet cutting device according to claim 1, wherein the arrangement of the handle and the clamp lever and the range of movement of the slide lever are within the area of ​​a sphere having a diameter of 2 m.

5. A sheet cutting device as described in any one of claims 1 to 4, further comprising a pressing section consisting of a flat plate or roller that presses the sheet from above with a constant load on the opposite side of the first guide rail from the pair of rollers.

6. a sheet arrangement step of rotatably arranging a roll-shaped sheet; a feeding step of clamping the sheet with a pair of rollers and feeding the sheet in a predetermined direction; A cutting step of cutting the sheet along a width direction, The cutting step includes: a first guide rail provided along the width direction of the sheet, a slide cutter having a cutter blade capable of translational movement along the first guide rail, and a second guide rail and a slide lever that translates along the second guide rail to operate the slide cutter; a movement amount of the slide cutter is set to correspond to a movement amount of the slide lever and to be larger than the movement amount of the slide lever, A method for cutting a sheet, in which, when the slide lever is not operated, the slide cutter and the slide lever each return to their initial positions, and in a cutting section, the slide lever is translated along the second guide rail, causing the slide cutter to translate along the first guide rail to cut the sheet.

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