JP2019214083A - Sheet cutting device - Google Patents

Abstract

To provide a sheet cutting device which can elongate a service life of a blade of a die cut roll.SOLUTION: A sheet cutting device 1 is arranged with a blade slide unit 20 on an outer circumference of a die cut roll 11 which is rotated synchronously with an anvil roll 12. The blade slide unit 20 has a blade holder 22 provided with a blade 23 along a sliding groove 21c of a sheet cutting direction provided on a stationary block 21, which is arranged freely slidably such that slipping of the blade holder 22 is prevented by first and second stoppers 24, 25. The blade holder 22 is reciprocated in the sheet cutting direction integrally with an actuation shaft 30 of a blade sliding actuation part 27 utilizing a cam mechanism. A cam lever 32 is inclined by a cam roller 32 moved integrally with the die cut roll 11 at a sheet cutting position, moves the actuation shaft 30 in a forward direction against spring force of a spring 31 and, thereafter, is moved backwardly by the spring force.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a sheet cutting device that cuts a fed long sheet at predetermined intervals.

  In the sheet cutting apparatus, a predetermined interval (referred to as a roll interval) is provided between an outer peripheral surface of a die-cut roll having a linear blade (blade) formed on the outer peripheral surface of a rotating roll and an anvil roll receiving a linear blade. There has been proposed a configuration in which each sheet is rotatably arranged on a frame, and the fed sheet is cut so as to be pushed off by a linear blade (Patent Document 1).

  The edge of the straight blade provided on the die cut roll protrudes slightly to contact the surface of the anvil roll, and the sheet conveyed while being sandwiched between the die cut roll and the anvil roll is cut by the shearing force of the straight blade Is done.

JP 2010-23156 A

  As disclosed in Reference 1, since the linear blade of the die cut roll comes into pressure contact with the surface of the anvil roll every time the sheet is cut, the material of the sheet to be cut is difficult to cut, or the cutting length is small. In the case of a long time, the pressure limit may be exceeded and cutting may not be performed. Further, as the number of times of cutting increases, the cutting edge of the linear blade may be damaged, which may hinder sheet cutting. When such blade damage occurs, it is necessary to replace the straight blade if the straight blade is a separate structure from the die cut roll, and if the straight blade is integrated with the die cut roll. Had to replace the die cut roll. Further, since the blade is in contact with the anvil roll every time, the replacement frequency is high and there is a problem in handling.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a sheet cutting device capable of extending the life of a blade of a die cut roll.

  A configuration of a sheet cutting device that achieves an object of the present invention is a sheet cutting device that cuts a long sheet to be conveyed into a piece of sheet having a predetermined length, wherein the long sheet is cut along a direction orthogonal to a conveyance direction. A die-cut roll in which one or a plurality of blade slide units having blades for cutting are arranged on the outer periphery, and a die-cut roll arranged opposite to the die-cut roll with a gap from the outer peripheral surface of the blade slide unit, and synchronized with the die-cut roll Rotating, an anvil roll formed on the outer peripheral surface of a groove portion into which the blade edge of the blade enters at a sheet cutting position facing the blade slide unit, the blade slide unit includes a blade holder having the blade, Insert the blade holder into the long sheet cutter A holding block slidably held along the cutting direction, a fixed block fixed to the outer peripheral surface of the die cut roll, and a blade slide operating portion for reciprocatingly driving the blade holder at the sheet cutting position along the sheet cutting direction. And

  Preferably, the blade slide unit has a slide groove in which the blade holder is slidably disposed on an outer peripheral portion of the fixed block, and allows movement of the blade holder in the sheet cutting direction, It is possible to adopt a configuration having a holding means for preventing movement outward in the radial direction.

  Preferably, the fixed block may have an embossed portion formed by embossing an outer peripheral surface formed in an arc shape on both sides of the slide groove in the sheet conveying direction.

  Preferably, the blade slide operating portion is reciprocally movable in a sheet cutting direction integrally with the cam member and the blade holder, and is movable in a forward direction by a cam operation of the cam member; Elastic means for driving the operating shaft in the backward direction by the accumulating force, and the cam member while contacting the cam member moving toward the sheet cutting position by the rotation of the die cut roll. And a cam operating member for moving the operating shaft in the forward direction by performing a cam operation.

  According to the present invention, since the blade cuts the long sheet by pulling it, the cutting ability (sharpness) is improved. At this time, since the blade edge of the blade is in the groove of the anvil roll, the blade edge of the blade does not contact the surface of the hard anvil roll, and the life of the blade can be extended.

  Further, the blade holder can be prevented from coming off during the sheet cutting operation.

  Further, since the fixed block is embossed, the sheet is prevented from sticking to the outer peripheral surface of the fixed block, and the sheet can be smoothly conveyed.

  In addition, since the sheet cutting operation can be mechanically performed by using the rotational force of the die cut roll by the cam mechanism, it is not necessary to use a separate drive motor for the blade slide operation unit, and the cost can be reduced.

1 is a schematic front view showing an embodiment of a sheet cutting device according to the present invention. It is an AA arrow line view of FIG. FIG. 2 is an enlarged view as viewed from an arrow B in FIG. 1. FIG. 3 is an exploded perspective view of the blade slide unit shown in FIG. FIG. 5 shows the blade slide unit shown in FIG. 4, showing a non-cutting state where the blade is not slid. Fig. 5 shows the blade slide unit shown in Fig. 4, showing a cutting state in which the blade has slid. FIG. 6 shows the blade slide unit shown in FIG. 4, and shows a cross-sectional view taken along CC in FIG. 5.

  Hereinafter, an embodiment of a sheet cutting device according to the present invention will be described in detail with reference to the drawings.

  1 and 2, a sheet cutting apparatus 1 of the present embodiment continuously cuts a long sheet 2 wound in a coil shape into sheet pieces (sheets) 3 of a predetermined size. Are stacked on the sheet stacking unit 5 by the sheet discharging and conveying roll unit 4. The long sheet 2 is fed to the sheet cutting device 1 by a sheet feeding / conveying roll unit 7 via a sheet conveying roll unit 6 and is conveyed in a discharge direction by a sheet discharging / conveying roll unit 4 to be fed into the sheet feeding unit. A predetermined tension is applied between the transporting roll unit 7 and the sheet discharging and transporting roll unit 4. The sheet transport roll section 6, the sheet feed transport roll section 7, and the sheet discharge transport roll section 4 constitute a sheet transport section.

  The sheet discharging / conveying roll unit 4, the sheet conveying roll unit 6, and the sheet feeding / conveying roll unit 7 each include a pair of opposing rolls 8a and 8b, and are driven to rotate in a predetermined conveying direction by a drive motor (not shown). . The sheet transport unit having the above-described configuration is configured to apply a tension to the sheet 2 and is not limited to such a configuration, and various configurations may be applied.

  In the example of the sheet cutting apparatus 1 shown in the figure, an apparatus frame F is provided with a metal die-cut roll 11 having an octagonal cross section as a first roll and a metal cylindrical anvil roll 12 as a second roll. Are arranged rotatably in a predetermined transport direction. The die-cut roll 11 may have a cylindrical shape like the anvil roll 12. In the example of the drawing, D1 <D2, where D1 is the outer diameter of the die cut roll 11 and D2 is the outer diameter of the anvil roll 12. The metal first rotating shaft 13 provided at the center of the die-cut roll 11 and the metal second rotating shaft 14 provided at the center of the anvil roll 12 are positioned on the same axis with their axes extending in the vertical direction. So as to face each other.

  A plurality of metal blade slide units 20 are arranged on the outer peripheral portion of the die cut roll 11 at equal intervals along the axial direction along the axial direction. In the present embodiment, four blade slide units 20 are connected to the first rotary shaft. 13 are arranged at 90 degree angular intervals. The number of blade slide units 20 to be arranged is not limited to four, but may be one or more. Assuming that the radius from the axial center of the die cut roll 11 to the outer peripheral surface of the blade slide unit 20 is R, the radius R is equal to the radius (D2 / 2) of the anvil roll 12. Further, when the blade slide unit 20 faces the outer peripheral surface of the anvil roll 12, the outer peripheral surface of the blade slide unit 20 and the outer peripheral surface of the anvil roll 12 have a predetermined gap S (see FIG. 3).

  The configuration of the blade slide unit 20 will be described further with reference to FIGS.

  In the present embodiment, the die cut roll 11 has an octagonal cross section, and the blade slide units 20 are arranged on every other flat surface 15 for every eight flat surfaces. In this case, the die cut roll 11 may be formed in a circular cross section, and only the arrangement portion of the blade slide unit 20 may be a flat surface. On the flat surface 15 of the die-cut roll 11, a mounting concave portion 16 having a concave cross-sectional shape into which a fixed block 21 described later of the blade slide unit 20 is fitted shallowly is formed.

  As shown in FIG. 4, the blade slide unit 20 includes a fixed block 21 having the same length as the axial length of the die cut roll 11, a blade holder 22, a straight blade 23, and a radial direction of the blade holder 22. Holding means for allowing the blade holder 22 to slide within a predetermined distance along a cutting direction (axial direction of the first rotating shaft 13) which is a direction orthogonal to the conveying direction of the long sheet 2 while restricting the movement. A first stopper 24 and a second stopper 25, a pair of stopper fixing screws 26 for fixing the first stopper 24 and the second stopper 25 to both axial end surfaces of the fixed block 21, and a blade slide operating portion 27. Have.

  The fixed block 21 has a bottom surface 21a formed in a flat surface and an outer peripheral surface formed in an arc shape. The fixed block 21 has a slide groove 21c having a predetermined depth in the center in the width direction (circumferential direction) of the top 21b. It is formed along. The slide groove 21c is formed by opening both ends in the axial direction of the fixed block 21, the stopper piece 24a of the first stopper 24 is inserted into one opening 21d, and the notch-shaped stopper of the second stopper 25 is inserted into the other opening 21e. The opening 25a faces. The stopper opening 25a is closed radially outward and forms a gap H1 along the radial direction between the stopper opening 25a and the inner bottom surface 21g of the slide groove 21c (see FIG. 7).

  The fixing block 21 is formed with a screw insertion hole 21f through which a pair of stopper fixing screws 26 are inserted on both sides in the circumferential direction across the slide groove 21c along the axial direction. The first stopper 24 has a screw hole 24b into which the tip of a pair of stopper fixing screws 26 is screwed, and the second stopper 25 has a screw insertion hole 25b into which the pair of stopper fixing screws 26 is inserted. .

  Therefore, the first stopper 24 and the second stopper 25 are screwed into the screw hole 24b of the first stopper 24 through the screw insertion hole 25 of the second stopper 25 and the screw insertion hole 21f of the fixing block 21. It is fixed to both ends of the fixed block 21. The first stopper 24 and the second stopper 25 are attached to the fixed block 21 after attaching the blade holder 22 to which the blade 23 is attached to the slide groove 21c. A gap H2 is formed between the radial inner end of the stopper piece 24a of the first stopper 24 and the inner bottom surface 21g of the slide groove 21c (see FIG. 7).

  As shown in FIGS. 5 and 6, the outer peripheral surfaces on both sides in the circumferential direction of the fixed block 21 across the slide groove 21c are subjected to embossing with a large number of uneven surfaces to form an embossed portion 21h. . The embossed portion 21h receives a predetermined tension to prevent the sheet 2 coming into contact with the embossed portion 21h from adhering to a vacuum state, so that the sheet 3 can be smoothly separated from the outer surface of the fixed block after cutting. .

  The blade holder 22 has a main body portion 22a formed in a rectangular flat plate shape extending along the axial direction of the first rotating shaft 13, and is inserted into an insertion groove 22b formed along the axial direction on the outer peripheral surface of the main body portion 22a. The blade 23 is inserted and fixed. The length of the blade 23 along the axial direction is equal to the length of the main body 22a along the axial direction. The blade edge of the blade 23 projects radially outward from the outer end surface of the main body 22a by a predetermined length.

  A connection joint 22c is formed integrally with one end of the main body 22a in the axial direction along the axial direction, and a stopper insertion portion 22d is formed integrally with the other end of the main body 22a along the axial direction. The coupling joint portion 22c has a height H3 (the height H3 is equal to the gap H2), and is slidably disposed between the stopper piece 24a of the first stopper 24 and the bottom surface of the slide groove 21c without play. The stopper insertion portion 22d has a height H4 (the height H4 is the same length as the gap H1), a length protruding axially outward through the stopper opening 25a of the second stopper 25, and a slide groove. It is slidably arranged without play between the bottom surface of 21c. Therefore, the blade holder 22 is allowed to slide along the sheet cutting direction, but is prevented from moving radially outward, and is prevented from falling off the fixed block 21. Further, the main body portion 22a of the blade holder 22 is formed such that the axial length is shorter than the length between the inner end surface 24e of the stopper piece 24a of the first stopper 24 and the inner end surface 25c of the second stopper 25, The difference is the slidable distance of the blade holder 22.

  When the operating shaft 30 is connected to the connecting joint 22 c of the blade holder 22 and the blade slide unit 20 reaches a position facing the concave groove 12 a to be described later by the rotation of the die cut roll 11, the blade slide operating unit 27 is rotated. Then, the blade holder 22 is slid from the one end in the axial direction to the other end by the operating shaft 30, and the sheet 2 contacting the blade 23 is cut linearly in the sheet cutting direction.

  As shown in FIG. 3, a concave groove 12a is formed along the axial direction on the outer peripheral surface of the anvil roll 12 so that the blade edge of the blade 23 does not contact the blade 23 in the axial direction. The width is larger than the width of the holder 22. The number of the concave grooves 12 a is equal to the number of the blade slide units 20. The die-cut roll 11 and the anvil roll 12 are rotated synchronously so that the concave groove 12a and the blade slide unit 20 face each other at the cutting position of the sheet 2.

  The blade slide operating section 27 includes a bottomed case 29 having a mounting flange 28 at an open end, an operating shaft 30, a compression coil spring 31, and a cam lever 32 (see FIGS. 2, 5 to 7) serving as a cam member. , A first stopper 24 and a cam roller 33 serving as a cam operating member attached to the frame F. The operating shaft 30 and the compression coil spring 31 are housed in the bottomed case 29, the open end of the bottomed case 29 is closed with the first stopper 24, and the fixing screw 34 inserted through the screw insertion hole 28 a of the mounting flange 28 is first inserted. By screwing into the screw hole 24 c of the stopper 24, the blade slide operation unit 27 is unitized except for the cam roller 33.

  A shaft hole 29b through which one end 30a of the operating shaft 30 penetrates is formed in a bottom wall 29a of the bottomed case 29, and a shaft hole 24d through which the other end 30b of the operating shaft 30 penetrates is formed in the first stopper 24. You. The operating shaft 30 has a spring seat portion 30c fixed near one end 30a, and a compression coil spring 30 is elastically mounted between the spring seat 30c and the first stopper 24. As shown in FIG. 7, a circumferential groove 30 d is formed in the outer peripheral portion in the circumferential direction at the other end portion 30 b of the operation shaft 30, and a pair of engaging claws 22 e of the coupling joint portion 22 c of the blade holder 22 are circumferentially formed. The engagement with the groove 30d allows the operating shaft 30 and the blade holder 22 to reciprocate integrally in the sheet cutting direction along the axial direction.

  One end 30a of the working shaft 30 is urged axially outward through the bottom wall 29a of the bottomed case 29 by the spring force of a compression coil spring 31 which is an elastic means acting on the spring seat 30c. The one end 30a protrudes outside the bottom wall 9a to an initial position where the one side surface 22f of the main body 22a of the blade holder 22 contacts the stopper piece 24a of the first stopper 24. When the one end 30a of the protruding working shaft 30 is directed toward the other end 30b and pushed in against the spring force of the compression coil spring 30, the blade holder 22 slides integrally with the blade 23 toward the other end 30b. Then, the compression coil spring 31 is charged. When the operation of pushing one end 30a of the operating shaft 30 toward the other end 30b is released, the operating shaft 30 returns to the initial position by the elastic force of the compression coil spring 30.

  As shown in FIGS. 5 and 6, the cam lever 32 is formed in a substantially L-shaped side surface, and can be tilted about a support shaft 32b provided at an end of the short lever portion 32a. The support shaft 32b is supported by a bearing 29c provided on a side surface of the bottomed case 29. The long lever portion 32c of the cam lever 32 is rotatably provided with a contact roller 32d that contacts the tip of one end 30a of the operating shaft 30. As shown in FIG. 5, in a state where the operating shaft 30 has returned to the initial position, the long lever portion 32 of the cam lever 32 is held in an inclined state by the elastic force of the compression coil spring 30 via the operating shaft 30. The distal end portion 32e of the long lever portion 32 is located outward in the axial direction.

  As shown in FIGS. 5 and 6, a cam surface 32 f protruding axially outward is formed on the outer surface of the distal end portion 32 e of the long lever portion 32 c of the cam lever 32. The cam surface 32 f is located on the upstream side of the center axis of the working shaft 30 when viewed in the rotation direction E (the moving direction of the fixed block 21) for cutting the sheet 2 of the die cut roll 11. If the long lever portion 32c is rapidly pushed in when the blade 23 reaches the cutting position, as shown in FIG. 3, the blade 23 faces the concave groove 12a of the anvil roll 12 along the sheet cutting direction. Slide movement can be performed reliably. For this reason, when the cam lever 32 as shown in the figure is used, the cam roller 33 that pushes the long lever portion 32c while abutting on the moving cam surface 32f is viewed in the moving direction E of the fixed block 21 and the cutting position is higher than the cutting position. Is also provided on the upstream side.

  In the blade slide unit 20 configured as described above, the fixing block 21 is fitted into the mounting recess 16 of the die cut roll 11, and a fixing screw (not shown) is formed in the die cut roll 11 through a screw insertion hole 21 i formed in the fixed block 21. The fixing block 21 is fixed to the die cut roll 11 by screwing into the screw hole (not shown).

  In the sheet cutting apparatus 1 having the above-described configuration, the sheet 2 that passes through the cutting position while being tensioned by the sheet conveying unit is fixed to the die cut roll 11 when the blade 23 of the blade slide unit 20 approaches the cutting position. The sheet is conveyed while being sandwiched between the embossed portion 21h of the slide unit 20 and the outer peripheral surface of the anvil roll 12. At this time, the cam surface 32f of the cam lever 32 moves toward the other end in the axial direction while being in contact with the cam roller 33, whereby the cam lever 32 is tilted in a direction perpendicular to the operation shaft 30, and the contact roller 32d is moved. The operating shaft 30 is pushed to the other end in the axial direction via the blade, and the blade 23 slides and cuts the sheet 2 in the sheet cutting direction. The blade 23 starts to slide for cutting at a position where the blade 23 starts to enter one end in the width direction of the concave groove 12a of the anvil roll 12, and the return to the initial position after the cutting is completed is completed. It is before leaving from the other end side in the width direction of 12a. The leading end of the sheet 2 after cutting is sandwiched between the embossed portion 21h located downstream of the blade 23 in the rotation direction E of the die-cut roll 11 and the outer peripheral surface of the anvil roll 12, and is held by the sheet discharge roll portion 4. It is conveyed toward. That is, the sliding movement of the blade 23 in the sheet cutting direction is determined by the cam locus of the cam surface 32f, the arrangement position of the cam roller 33, and the like so as to be performed within the width direction of the concave groove 12a of the anvil roll 12. . Note that the embossed portion 21h is not essential, and a resin, rubber, sponge, or the like may be used instead of the embossed portion 21h.

  Accordingly, only the sheet 2 is cut without the cutting edge of the blade 23 coming into contact with the surface of the hard anvil roll 12, so that the life of the blade 23 can be extended. In addition, since the blade 23 is configured to be cut in a non-contact manner, the blade 23 can be formed of a material (for example, ceramic or the like) that is easily damaged by pressure contact. Thereby, the blade 23 of the optimum material can be appropriately selected and used according to the material of the sheet 2 and the like. Further, it is not necessary to strictly adjust the height when the blade 23 comes into pressure contact with the anvil roll 12 as conventionally performed.

  In the present embodiment, the operating shaft 30 is pushed by the cam lever 33, but the cam member may be formed by a leaf spring. Alternatively, the die cut roll 11 may be movable in the vertical direction, and the gap S between the die cut roll 11 and the outer peripheral surface of the anvil roller 12 may be changed according to the thickness of the sheet 2.

F: Device frame S, H1, H2: Clearance H3, H4: Height E: Rotation direction L: Axis 1: Sheet cutting device 2: Sheet 3: Sheet piece (sheet)
4: Sheet discharging / conveying roll section 5: Sheet stacking section 6: Sheet conveying roll section 7: Sheet feeding / conveying roll section 8a, 8b: A pair of rolls 11: Die cut roll 12: Anvil roll 12a: Groove 13: First rotation Shaft 14: Second rotating shaft 15: Flat surface 16: Mounting recess 20 Blade slide unit 21: Fixed block 21a: Bottom surface 21b: Top portion 21c: Slide groove 21d: One opening 21e: The other opening 21f: Screw insertion hole 21g: Inner bottom surface 21h: embossed portion 21i: screw insertion hole 22: blade holder 22a: main body portion 22b: insertion groove 22c: connection joint portion 22d: stopper insertion portion 22e: pair of engagement claws 22f: one end side surface 23: blade 24 : First stopper 24a: Stopper piece 24b: Screw hole 24c: Screw hole 24d: Shift hole 24e: Inner end surface 25: Second stopper 25a: Stopper opening 25b: Screw insertion hole 25c: Inner end surface 26: Stopper fixing screw 27: Blade slide operating portion 28: Mounting flange 28a: Screw insertion hole 29: Bottom case 29a : Bottom wall 29b: shaft hole 29c: bearing 30: operating shaft 30a: one end 30b: other end 30c: spring seat 30d: circumferential groove 31: compression coil spring 32: cam lever 32a: short lever 32b: support shaft 32c: long lever part 32d: contact roller 32e: tip part 32f: cam surface 33: cam roller 34: fixing screw

Claims (4)

A sheet cutting device for cutting a long sheet to be conveyed into sheet pieces of a predetermined length,
A die-cut roll in which one or a plurality of blade slide units provided with blades for cutting the long sheet along a direction orthogonal to the conveying direction are arranged on an outer peripheral portion,
A groove portion in which the blade edge of the blade enters at a sheet cutting position which is synchronously rotated with the die-cut roll and is rotated in synchronization with the die-cut roll and has a gap with the outer peripheral surface of the blade slide unit. Anvil rolls formed on the
Have
The blade slide unit includes a blade holder having the blade, a holding block slidably holding the blade holder along a cutting direction of the long sheet, and a fixing block fixed to an outer peripheral surface of the die cut roll; A blade slide operating unit for reciprocatingly driving the blade holder in the cutting direction of the sheet at a cutting position.   The blade slide unit has a slide groove in which the blade holder is slidably disposed on an outer peripheral portion of the fixed block, and allows movement of the blade holder in the sheet cutting direction, but is outside the slide groove in the radial direction. 2. The sheet cutting device according to claim 1, further comprising a holding unit that prevents movement of the sheet in the sheet cutting direction. The sheet cutting according to claim 1, wherein the fixing block has an embossed portion formed by embossing an outer peripheral surface formed in an arc shape on both sides of the slide groove with respect to the sheet conveying direction. apparatus.   An operating shaft that is reciprocally movable along a sheet cutting direction together with the cam member and the blade holder, and is movable in a forward direction by the cam operation of the cam member; and a forward operation of the operating shaft. The cam member is moved while contacting the cam member moving toward the sheet cutting position by the rotation of the die cut roll. The sheet cutting device according to any one of claims 1 to 3, further comprising a cam operating member that moves the operating shaft in a forward direction.