Slitter device

Abstract

To provide a slitter device capable of stably sending cardboard being an object to be cut, not causing a failure like "footprints of crow", and capable of beautifully cutting the cardboard.SOLUTION: A slitter device 1 includes one circular cutter 5 and cuts an object to be cut by rotating the cutter 5. The slitter device 1 includes a press member 6 that presses the object to be cut on one side of the cutter 5. The press member 6 has a circular shape rotating around an axial core identical to a drive shaft 4 of the cutter 5, and presses the object to be cut by an outer peripheral surface of the press member 6. A deceleration part 8 that decelerates a rotation speed of the press member 6 to equal to or less than a rotation number of the drive shaft 4 of the cutter is provided between the press member 6 and the drive shaft 4 of the cutter.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a slitter device, and more particularly to a slitter device equipped with a single blade for cutting materials such as cardboard. [Background technology]

[0002] Conventionally, blades used in slitter devices for cutting cardboard are classified into two types: a single-blade type, in which one blade is installed on the top that rotates in the direction of travel of the cardboard, and a double-blade type, in which two blades are installed on the top and bottom that rotate in the direction of travel of the cardboard.

[0003] The single-blade type is simpler and less expensive than the two-blade type, and produces a relatively good cut surface. However, with the single-blade type, the cardboard is pressed down only from above with one blade, so towards the end of the cut, the cardboard deviates from the designed cut line and cannot be cut straight. Also, in order to cut the cardboard cleanly, the rotation speed of the blade needs to be 20% faster than the other driving parts.

[0004] The two-blade type cuts the cardboard with two blades, one above the other, so the cardboard is held down and fixed between the two blades, resulting in a straight cut. The two-blade type also allows for a clean cut even when the blade rotation speed is the same as that of other drive components. However, because the two-blade type cuts by pinching both sides of the cardboard from above and below, the shearing action can crush the cut surface, causing the problem of liner peeling, known as "crow's feet." The packaging industry, which uses cardboard, has pointed out that "crow's feet" can cause problems such as damaging the aesthetic appeal of packaging, and there has been a demand to eliminate this defect.

[0005] One way to eliminate defects such as crow's feet is to use a die to perform the punching process, but this method has the disadvantage that the production speed is very slow, making it less productive, and the edges of the cardboard are crushed after punching, reducing its strength.

[0006] Patent Document 1 describes a cutting device in which two thin, circular blades are concentrically arranged on a rotating shaft with a small gap between them, and gas is ejected between the blades. However, the device in Patent Document 1 is essentially a single blade, with only the two upper circular blades arranged with a small gap between them, so it does not solve problems such as the inability to cut straight and the need for high-speed rotation.

[0007] Patent Document 2 describes a slitter device equipped with two circular slitter knives that rotate in opposite directions above and below the pass line of a cardboard sheet, and which is also equipped with a trimmings recovery means that sucks and recovers trimmings that occur on both sides of the sheet. However, the device in Patent Document 2 does not at all solve problems such as "crow's feet." [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Japanese Patent Publication No. 57-107791 [Patent Document 2] Patent No. 3618164 specification Summary of the Invention [Problem to be solved by the invention]

[0009] The present invention has been made in consideration of the above-mentioned conventional problems, and has as its object to provide a slitter device that can stably feed cardboard boxes, which are the objects to be cut, and can cut them neatly without causing defects such as "crow's feet." [Means for solving the problem]

[0010] The means for solving the above problems are as follows. (1) A slitter device includes a circular blade that rotates to cut an object, and includes a pressing member on one side of the blade that presses the object. (2) The pressing member has a circular shape that rotates around the same axis as the drive shaft of the blade, and the outer circumferential surface of the pressing member presses the workpiece. (3) A speed reducer is provided between the presser member and the drive shaft of the blade, which reduces the rotation speed of the presser member to a speed equal to or lower than the rotation speed of the drive shaft of the blade. (4) The reduction gear unit has an input gear provided on the drive shaft of the blade, a first idler gear that meshes with the input gear, a second idler gear that meshes with the first idler gear, and an output gear that is integral with the pressing member and meshes with the second idler gear. (5) The pressing member rotates at a rotational speed equal to or lower than the rotational speed of the blade. (6) The rotation speed of the pressing member is the same as the feed speed of the workpiece. (7) A receiving member is provided that faces the pressing member with the workpiece sandwiched therebetween. (8) The receiving member has a circular shape and receives the workpiece on the outer circumferential surface of the receiving member. (9) The rotation speed of the receiving member is the same as the feed speed of the workpiece. (10) The receiving member has an outer circumferential groove into which the outer circumferential portion of the blade fits. [Effects of the Invention]

[0011] According to the present invention, in a slitter device that has one circular blade and rotates the blade to cut the material to be cut, a pressing member that presses down the material to be cut is provided on one side of the blade, so that the cardboard to be cut can be fed stably, and defects such as "crow's feet" do not occur, resulting in a clean cut. [Brief explanation of the drawings]

[0012] [Figure 1] FIG. 1 is a front view of a slitter device according to an embodiment of the present invention. [Figure 2] FIG. 2 is a left side view of the slitter device of FIG. 1. [Figure 3] FIG. 2 is a right side view of the slitter device of FIG. 1. [Figure 4] Cross-sectional view of line IV-IV in Figure 1. [Figure 5] Enlarged view of a portion of Figure 4. [Figure 6] Cross-sectional view of line VI-VI in Figure 4. [Figure 7] Exploded cross-sectional view of Figure 6. [Figure 8] Side view of the auto slitter [Figure 9] Cross-sectional view taken along line IX-IX in Figure 8. DETAILED DESCRIPTION OF THE INVENTION

[0013] Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

[0014] 1-3 show a slitter device 1 according to an embodiment of the present invention for cutting a cardboard box W. The slitter device 1 includes a blade rotation shaft 2, a cutter frame 3, a drive shaft 4, a blade 5, a pressure roll 6, a drive unit 7, a speed reducer 8, and a receiving roll 9.

[0015] The blade rotation shaft 2 is mounted on a lifting frame 10 so as to be rotatable by a blade drive motor 11, and has a splined outer surface. The blade rotation shaft 2 is provided with a spline boss 12 that is splined to the blade rotation shaft 2. A drive sprocket 13 of the drive unit 4, which will be described later, is fixedly attached to one end of the spline boss 12. Two hinge plates 15, spaced a predetermined distance apart by a ring-shaped spacer 14, are rotatably attached around the spline boss 12 via bearings 16. The hinge plates 15 are fixed to the lifting frame 10, as shown in Figures 2 and 3.

[0016] As shown in Fig. 7, the cutter frame 3 has an attachment hole 3a formed at one end and a substantially semicircular pressure roll accommodating recess 3b formed on the side surface of the other end. As shown in Fig. 6, the attachment hole 3a at one end of the cutter frame 3 fits onto the outer periphery of the spacer 14 of the two hinge plates 15, and the one end is sandwiched between the two hinge plates 15. This allows the cutter frame 3 to rotate around the blade rotation shaft 2 and to move axially together with the two hinge plates 15 and spline boss 12.

[0017] 7, a first fixed flange 17 having a circular shaft accommodating recess 17a is attached to the pressure roll accommodating recess 3b of the cutter frame 3, and a ring-shaped second fixed flange 19 is attached to the first fixed flange 17 via a connecting pin 18. The space between the first fixed flange 17 and the second fixed flange 19 forms a gear accommodating space that accommodates idler gears 31 and 32 of the reduction gear unit 8, which will be described later.

[0018] As shown in Figure 3, a cancel arm 20 is attached to the cutter frame 3. An adjustment screw 21 provided between the cancel arm 20 and the lifting frame 10 adjusts the distance between the cancel arm 20 and the lifting frame 10, thereby rotating the cutter frame 3 around the blade rotation shaft 2 and adjusting the position of the blade 5 relative to the cardboard box W. In addition, an air cylinder 22 attached to the tip of the cancel arm 20 rotates the cutter frame 3 around the blade rotation shaft 2, moving the blade 5 away from the cardboard box W and allowing the cardboard box W to pass through.

[0019] As shown in Figure 7, one end of the drive shaft 4 is inserted into the second fixed flange 19 and accommodated in the shaft accommodating recess 17a of the first fixed flange 17. The drive shaft 4 is rotatably supported by bearings 23 on the first fixed flange 17 and the second fixed flange 19. The other end of the drive shaft 4 protrudes from the second fixed flange 19. An input gear 24 of the reduction unit 8 (described later) is integrally attached between the two bearings 23 of the drive shaft 4, and the input gear 24 is accommodated in a gear accommodating space between the first fixed flange 17 and the second fixed flange 19. A driven sprocket 25 of the drive unit 7 (described later) is fixedly attached to the portion of the drive shaft 4 protruding from the second fixed flange 19, and a blade mounting disk 26 is integrally attached to the driven sprocket 25.

[0020] The blade 5 is a disk-shaped blade with a cutting edge formed on its outer periphery, and is attached to a blade mounting disk 26 attached to the drive shaft 4.

[0021] The pressure roll 6 has a ring shape, with approximately the upper half of the pressure roll 6 being able to be accommodated in the pressure roll accommodating recess 3b, and has a pressure surface 6a on its outer circumferential surface that contacts and presses the cardboard W to be cut. The pressure surface 6a is knurled. The pressure roll 6 has an outer diameter smaller than the outer diameter of the blades 5. In this embodiment, the outer diameter of the blades 5 is 260 mm, while the outer diameter of the pressure roll 6 is 230 mm, but this is not limited to this. An output gear 27 of the speed reduction unit 8, which will be described later, is integrally attached to the inner circumferential surface of the pressure roll 6. An inner flange 27a and an outer flange 27b are formed on both side surfaces of the output gear 27. The inner flange 27a is rotatably attached to the outer circumferential surface of the first fixed flange 17 via a bearing 28, and the outer flange 27b is rotatably attached to the outer circumferential surface of the second fixed flange 19 via a bearing 28.

[0022] 6, the drive unit 7 is made up of the aforementioned blade rotation shaft 2, a drive sprocket 13 mounted on the blade rotation shaft 2 so as to rotate integrally therewith, a drive shaft 4, a driven sprocket 25 mounted on the drive shaft 4 so as to rotate integrally therewith, a chain 29 stretched between the drive sprocket 13 and the driven sprocket 25, and an idler sprocket 30 that adjusts the tension of the chain 29. In this embodiment, the drive sprocket 13 has 45 teeth and the driven sprocket 25 has 65 teeth, but this is not a limitation.

[0023] 5, the speed reduction section 8 is composed of an input gear 24 provided on the drive shaft 4 so as to be rotatable integrally therewith, two first idler gears 31 meshing with the input gear 24, two second idler gears 32 meshing with the two first idler gears 31, and an output gear 27 provided on the pressure roll 6 so as to be rotatable integrally therewith and meshing with the two second idler gears 32. In the embodiment, the number of teeth of the input gear 24 is 50, the number of teeth of the two first idler gears 31 is 20, the number of teeth of the two second idler gears 32 is 20, and the number of teeth of the output gear 27 is 100, so that the pressure roll 6 rotates at half the rotation speed of the drive shaft 7, but the present invention is not limited to this.

[0024] As shown in FIG. 1, the backing roll 9 is mounted around a backing roll rotation shaft 33 so that it can be rotated by a backing roll drive motor 34. The backing roll 9 is ring-shaped with the same outer diameter as the pressure roll 6, and has a first receiving surface 9a and a second receiving surface 9b on its outer periphery that come into contact with and receive the cardboard W to be cut. The first receiving surface 9a and the second receiving surface 9b are knurled. A peripheral groove 9c into which the blade 5 enters is formed between the first receiving surface 9a and the second receiving surface 9b, preventing interference between the blade 5 and the backing roll 9. The first receiving surface 9a faces the pressure surface 6a of the pressure roll 6, and the second receiving surface 9b faces the driven sprocket 25. In the embodiment, the outer diameter of the pressure roll 6 is 230 mm, while the outer diameter of the backing roll 9 is also 230 mm, the width of the first backing surface 9a is 39 mm, the same as the pressure surface 6a of the pressure roll 6, the width of the second backing surface 9b is 20 mm, and the width of the outer peripheral groove 9c is 16 mm, but this is not limited to this.

[0025] 1, the lifting frame 10 can be raised and lowered by a lifting frame drive motor (not shown), the blade rotation shaft 2 can be rotated by a blade drive motor 11, and the receiving roll rotation shaft 33 can be rotated by a receiving roll drive motor 34. The lifting frame drive motor, the blade drive motor 11, and the receiving roll drive motor 34 can be controlled by a control device 35.

[0026] Figure 8 shows an autoslitter 50 incorporating four slitter devices 1 of the above-described embodiment. The autoslitter 50 has a main frame 51 and, from upstream to downstream, a supply table 52, a first feed roll unit 53, the slitter device 1 of this embodiment, a second feed roll unit 54, a first crease roll unit 55, and a second crease roll unit 56. The supply table 52 is provided with a supply ruler unit 57. The lift frame 10 of the slitter device 1 is mounted on the main frame 51 so that it can be raised and lowered. As shown in Figure 9, four slitter devices 1 are provided, and the spacing between the slitter devices 1 in each set is adjustable.

[0027] As shown in FIG. 9 , the auto slitter 50 can use two of the four slitter devices 1 to cut both ends of the cardboard W to a predetermined width. In this case, the slitter device 1 that is not being used has its cancel arm 20 rotated by the air cylinder 22 to move upward away from the cardboard W. Also, by using four slitter devices 1 and adjusting the spacing between each slitter device 1, four sheets of cardboard W of a predetermined width can be cut from one sheet of cardboard W. When the cardboard W is creasing using the first creasing roll unit 55 or the second creasing roll unit 56 without using the slitter device 1, the cancel arm 20 is rotated by the air cylinder 22 to move upward away from the cardboard W.

[0028] Next, the operation of the slitter device 1 of the embodiment will be described.

[0029] In Figure 3, the lifting frame 10 is raised and lowered, and the cutter frame 3 is lowered to a position where the cardboard W can be cut by the blade 5 according to the thickness of the cardboard W (3 mm, 5 mm, 8 mm). When the blade rotation shaft 2 is rotated by the blade drive motor 11, the drive sprocket 13 rotates via the spline hub 12 that rotates integrally with the blade rotation shaft 11. The rotational force of the drive sprocket 13 is transmitted to the driven sprocket 25 via the chain 29, causing the drive shaft 4 to rotate and the blade 5 to rotate. The rotation direction of the blade 5 is the same as the feed direction of the cardboard W at the position where the cardboard W is cut. In the embodiment, the rotation speed of the blade 5 was set to 120 m / min.

[0030] As shown in FIG. 5, when the drive shaft 4 rotates, the rotational force of the drive shaft 4 is transmitted from the input gear 24, which rotates integrally with the drive shaft 4, to the output gear 27 via the first idler gear 31 and the second idler gear 32, causing the pressure roll 6, which is integral with the output gear 27, to rotate. Since the ratio between the input gear 24 and the output gear 27 is 50:100, the pressure roll 6 is decelerated and rotates at half the rotation speed of the drive shaft 4 and the blades 5. The rotational speed of the outer periphery of the pressure roll 6 is set to the same as the feed speed of the cardboard W. In the embodiment, the rotational direction of the pressure roll 6 is the same as the feed direction of the cardboard W on the pressure surface that contacts the cardboard W. In the embodiment, the rotational speed of the pressure roll 6 is set to 100 m / min, which is slower than the rotational speed of the blades 5.

[0031] 3, the receiving roll rotation shaft 33 of the receiving roll 9 is rotated by a receiving roll drive motor 34. The rotation direction of the receiving roll 9 is the same as the feeding direction of the cardboard box W on the receiving surface that contacts the cardboard box W. In the embodiment, the rotation speed of the receiving roll 9 is set to 100 m / min, the same as the rotation speed of the pressure roll 6.

[0032] When the cardboard W is fed between the blade 9 and the receiving roll 9, the cardboard W is cut and cut by the blade 5 while being sandwiched between the pressure roll 6 and the receiving roll 9.

[0033] As shown in Figure 1, the slitter device 1 of this embodiment uses a single blade, but cuts the cardboard W while it is sandwiched between a pressure roll 6 and a receiving roll 9, so the blade 5 does not wobble and the cardboard W can be cut straight with an accuracy of ±1 mm. Furthermore, unlike a two-bladed tool, the cut surface is not crushed by the shearing action of the two blades, so defects such as "crow's feet" do not occur. Furthermore, since the blade 5 is a single blade and the speed reducer 8 is incorporated between the blade 5 and the pressure roll 6, the structure is simple, the number of production steps is small, and the delivery time can be shortened.

[0034] The present invention is not limited to the above-described embodiment, and various modifications and alterations are possible. [Explanation of symbols]

[0035] 1...Slitter device 2...Cutting tool rotation axis 3...cutter frame, 3a...mounting hole, 3b...pressure roll housing section 4...Drive shaft 5...Knives 6...pressure roll (pressure member), 6a...pressure groove 7...Drive unit 8…Principles section 9... receiving roll (receiving member), 9a... first receiving surface, 9b... second receiving surface, 9c... outer peripheral surface 9a...Outer groove 10...Lifting frame 11...Cutting tool drive motor 12...Spline boss 13...Drive sprocket 14...Spacer 15...hinge plate 16...Bearing 17...first fixing flange, 17a...shaft receiving recess 18...Connecting pin 19...Second fixed flange 20...Cancel arm 21...Adjustment screw 22...Air cylinder 23...Bearing 24...Input gear 25...Driven sprocket 26...Cutting tool mounting disc 27...output gear, 27a...inner flange, 27b...outer flange 28...Bearing 29...Chain 30...Idler sprocket 31...1st idler gear 32...Second idler gear 33... Support roll rotation axis 34...Receiving roll drive motor 35...Control device 50...Auto slitter 51...Main frame 52...Supply table 53...First feed roll section 54...Second feed roll section 55...First creasing roll section 56...Second creasing roll section 57…Supply ruler section W...Cardboard (item to be cut)

Claims

1. A slitter device having one circular blade that cuts an object by rotating the blade, characterized in that the slitter device further comprises a pressing member on one side of the blade that presses down the object.

2. 2. The slitter device according to claim 1, wherein the pressing member has a circular shape that rotates around the same axis as the drive shaft of the blade, and the outer peripheral surface of the pressing member presses the workpiece.

3. 2. The slitter device according to claim 1, further comprising a speed reducer between the pressing member and the drive shaft of the blade, for reducing the rotation speed of the pressing member to a rotation speed equal to or lower than that of the drive shaft of the blade.

4. 4. The slitter device according to claim 3, wherein the reduction section comprises an input gear provided on the drive shaft of the blade, a first idler gear meshing with the input gear, a second idler gear meshing with the first idler gear, and an output gear formed integrally with the pressing member and meshing with the second idler gear.

5. 3. The slitter device according to claim 2, wherein the pressing member rotates at a rotational speed equal to or lower than a rotational speed of the blade.

6. 6. The slitter device according to claim 5, wherein the rotation speed of the pressing member is the same as the feed speed of the workpiece.

7. 2. The slitter device according to claim 1, further comprising a receiving member that faces the pressing member with the workpiece sandwiched therebetween.

8. 8. The slitter device according to claim 7, wherein the receiving member has a circular shape and receives the workpiece on an outer peripheral surface of the receiving member.

9. 9. The slitter device according to claim 8, wherein the rotation speed of the receiving member is the same as the feed speed of the workpiece.

10. 8. The slitter device according to claim 7, wherein the receiving member has an outer circumferential groove into which the outer circumferential portion of the blade fits.

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