TWI597206B - Web cutting method and web cutting device - Google Patents

Description

Mesh cutting method and mesh cutting device

The present invention relates to a web cutting method and a mesh cutting device, and more particularly to a method suitable for cutting a mesh to be conveyed and winding the cut web A mesh cutting method of a mesh automatic winding machine on a new core, and a mesh cutting device.

When an article is manufactured using a mesh (belt-shaped support) such as a thin metal plate, paper, or plastic film, the mesh is treated (for example, coated, dried, etc.), and the mesh is formed. The object is wound on a winding core in a roll shape. In particular, in order to operate continuously, the web is wound on the core by a predetermined length by means of a mesh automatic winding machine, the web is cut in the width direction, and the web is rolled. Wrap around the new core.

In order to cut the web in the width direction, in general, the web automatic winding machine must have a web cutting device. Patent Document 1 discloses a mesh cutting device for preventing a mesh from being broken in a direction different from a cutting line when the mesh is cut. The mesh cutting device includes a pair of rotary cutters, and a pair of left and right nip rollers provided on both sides of the rotary cutter and sandwiching the mesh from the upper and lower directions. The pair of rotary cutters and the pair of right and left rolls are arranged such that the pair of rotary cutters have the cutting point of the web and the nip point of the roll-to-web are on the same surface. By the pair of left and right rolls, the tension for transferring the mesh is prevented from acting on the blade contact point of the rotary cutter.

[Previous Technical Literature]

[Patent Literature]

[Patent Document 1] Japanese Patent Special Fair No. 4-72673

FIG. 10 is a conceptual diagram of a cut state of the mesh by the mesh cutting device of Patent Document 1. As shown in Fig. 10, a pair of rolls 2 and rolls 3 are disposed on both sides of the cutting point CP of the pair of rotary cutters. The web W is conveyed in the direction of the arrow (the direction from the top to the bottom of the paper). A pair of rotary cutters are moved in the width direction of the web W to cut the web W obliquely. A web W is wound on the old core that has been wound up by a prescribed length, and the other web W that has been cut is wound on the empty new core 4. At this time, the tension is applied to both directions of the web W in the longitudinal direction.

However, as shown in Fig. 11, in the case where the web W is cut by a pair of rotary cutters, only one direction of tension is applied to the cut web W. Therefore, the direction of the tension applied to the web W is different from the cutting direction of the web W. The cutting direction is inclined with respect to the web W, and the tension is parallel to the web W. As a result, even if a pair of rolls 2 and rolls 3 are disposed, the web W is easily split in the direction of the arrow. This problem becomes remarkable particularly in a brittle network such as a triacetyl cellulose (TAC) film.

The present invention has been made in view of the above problems, and an object thereof is to provide a mesh cutting method and a mesh cutting device which are capable of suppressing breakage of a mesh and which are suitable for a mesh automatic winding machine.

According to an embodiment of the present invention, a mesh cutting method includes: a step of applying tension to a mesh to carry out a transport; and an upper blade and a lower edge The step of cutting the transported web in the width direction while moving the blade, in the step of cutting the web, on the upstream side of the web at the cutting point of the upper and lower edges and the mesh Two nip points on the downstream side sandwich the mesh from the thickness direction of the mesh, and are clamped upstream of the moving direction on the mesh at the cutting point and on the downstream side of the mesh Pointing, the mesh is clamped from the thickness direction of the mesh, so that the cutting point, the two upstream points on the upstream side of the mesh at the cutting point and the downstream side of the mesh, and the point at the cutting point The nip point upstream of the moving direction on the mesh is on the same side.

Moreover, the "same side" as referred to herein means not only the same surface but also substantially the same surface. That is, as long as the nip point including the cutting point, the upstream side of the web located at the cutting point and the downstream side of the web, and the cutting direction downstream of the moving direction on the web are formed. The virtual plane or the approximate plane of the point can be.

Preferably, a force is applied to the mesh toward the upstream side of the mesh at a nip point located upstream of the moving direction of the cutting point.

Preferably, the mesh comprises a cellulose resin.

According to another embodiment of the present invention, the mesh cutting device cuts the conveyed web in the width direction, and includes: a pair of rotary cutters including an upper blade and a lower blade; and a pair of left and right rolls arranged at The two sides of the cutting point of the upper blade and the lower blade, and the two nip points on the upstream side of the mesh at the cutting point and the downstream side of the mesh, sandwich the mesh from the thickness direction of the mesh An additional pair of rolls, holding the mesh at a nip point upstream of the moving direction on the web at the cutting point and on the downstream side of the mesh; and a moving device for making a pair of rolls a pair of knives, a pair of left and right rolls, and an additional pair of rolls along the mesh The object moves in the width direction, and the cutting point, the upstream side of the web at the cutting point, and the two nip points of the pair of left and right rolls on the downstream side of the web are cut on the mesh. The nip point of the additional pair of rolls upstream of the moving direction is substantially on the same surface.

Moreover, the "same side" as referred to herein means not only the same surface but also substantially the same surface. That is, as long as the nip point including the cutting point, the upstream side of the web located at the cutting point and the downstream side of the web, and the cutting direction downstream of the moving direction on the web are formed. The virtual plane or the approximate plane of the point can be.

Preferably, the additional rolls are arranged at a toe out angle of 0° or more and 5° or less with respect to the moving direction on the mesh at the cutting point.

According to the present invention, when the conveyed web is cut in the width direction, breakage of the web can be suppressed.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. The present invention has been described with reference to the preferred embodiments described below. However, the present invention can be modified by various methods without departing from the scope of the invention. Therefore, all modifications within the scope of the invention are included in the scope of the patent application.

Fig. 1 to Fig. 3 are conceptual views showing the principle of this embodiment for suppressing breakage of a mesh. As shown in Fig. 1, a pair of rolls 44 and a pair of rolls 48 are disposed on both sides of a cutting point CP of a rotary cutter including an upper blade and a lower blade. The mesh W is transported in the direction of the arrow (the direction from the top to the bottom of the figure). at this time, Tension is applied to both sides of the web W in the longitudinal direction. The rotary cutter moves in a width direction substantially orthogonal to the conveyance direction of the web W. The rotary cutter is disposed to be inclined so as to face the upstream side of the mesh conveyance direction at a predetermined angle (30° or more and 85° or less) with respect to the moving direction. The rotary cutter cuts the web W obliquely by moving the rotary cutter from one end of the web W toward the other end. The cutting point CP moves obliquely on the web W with respect to the conveying direction of the web. Here, the cutting point CP refers to a portion where the upper blade and the lower blade are substantially in contact with each other in a state of being overlapped with each other across the mesh, thereby cutting the mesh.

The downstream side of the web of the cutting point CP is sandwiched by the pair of rolls 44 (the lower rolls are not shown) from the thickness direction of the web W. Further, the upstream side of the web of the cutting point CP is sandwiched by the pair of rolls 48 (the lower rolls are not shown) from the thickness direction of the web W. Even if the tension accompanying the conveyance and the cutting acts on the web W, the tension is also blocked by the pair of rolls 44 and 48 at the cut portion CP. The mesh W is cut along the moving direction of the cutting point CP (dashed line A). The portion where the web W is sandwiched by the two pairs of rolls 44 and 48 becomes two nip points. In this case, at least one nip point (a total of two nip points) may be provided on the upstream side and the downstream side of the web W at least. Further, an additional nip point may be provided, and a total of three or more nip points may be provided.

Further, the additional pair of rolls 80 (the lower rolls are not shown) are disposed upstream of the cutting point CP in the moving direction on the web W and on the downstream side of the web, and sandwich the web from the thickness direction. W. Only the tension in the conveying direction is applied to the cut web W. By adding a pair of rolls 80 The downstream side of the cut web W is held so that the tension can be countered. Therefore, at the cutting point CP, the tension can be applied in a direction in which the web W is broken, so that the occurrence of cracking of the web W by the opening of the slit of the web W can be suppressed. The cut web W is wound around the old core which has been wound up by a predetermined length while being sandwiched by the pair of rolls 44, the pair of rolls 48, and the additional pair of rolls 80.

The other web W that has been cut is wound around the empty core 4, and thus can be subjected to tension in a direction opposite to the conveying direction applied to the other web W being cut.

Further, the nip point of the roll 44, the roll 48, and the roll 80 against the web W is substantially on the same plane as the cut point CP of the pair of rotary cutters. Thereby, the web W can be sharply cut. The fact that the matter is substantially on the same surface means that a virtual plane including each of the nip points and the cut point CP is formed.

Fig. 2 shows the relationship between the additional pair of rolls 80 and the moving direction A of the cutting point CP on the web. The additional pair of rolls 80 are preferably arranged at a toe-out angle θ of 0° or more and 5° or less with respect to the moving direction A of the cutting point CP on the mesh. By arranging the pair of additional rolls 80 at the above-described outer opening angle, a force in a direction opposite to the tension acting in the conveying direction of the web W can be applied to the downstream side of the cut web W. That is, the tension acting in the conveying direction can be canceled, so that the breakage of the cut web W can be more effectively suppressed.

The outer opening angle θ is a numerical value indicating how far the roll 80 faces outward with respect to the moving direction A on the mesh with respect to the cutting point CP. When the outer opening angle θ is less than 0°, the roll 80 is on the mesh with respect to the cutting point CP The direction of movement A is toward the inside. When the outer opening angle θ is 0°, the roll 80 is substantially parallel with respect to the moving direction A of the cutting point CP on the web. When the outer opening angle θ is larger than 0°, the roll 80 faces the outer side with respect to the moving direction A of the cutting point CP on the web.

Fig. 3 shows a state in which another web W that has been cut is not wound around the winding core and is cut. In the present embodiment, the additional pair of rolls 90 (the lower rolls are not shown) are disposed at positions facing the rolls 80 in the moving direction A of the cut-off point CP on the web W. That is, the pair of rolls 90 are disposed upstream of the cutting point CP in the moving direction on the web W and on the upstream side of the web, and sandwich the web W from the thickness direction. The tension on the side opposite to the conveying direction is applied to the other web W that is cut. A pair of rolls 90 grip the upstream side of the web and thus resist this tension. Thereby, the breakage of the web W can be suppressed.

Further, it is preferable that the pair of rolls 90 are disposed at an outer opening angle θ of 0° or more and 5° or less with respect to the moving direction A of the cutting point CP on the web. By arranging the pair of rolls 90 at the above-described outer opening angle, a force can be applied to the downstream side of the cut web W toward the conveying direction of the web W. The tension applied to the cut web W in the opposite direction to the conveying direction can be counteracted.

Next, a preferred embodiment of the mesh cutting device will be described in detail with reference to the accompanying drawings. 4 is a plan view showing the entire apparatus, FIG. 5 is an enlarged view of a main part of the mesh cutting device, and FIG. 6 is a perspective view of a casing omitting the rotary cutter.

The mesh cutting device 1 includes a moving device 24, which is 24 The pair of rotary cutters are moved in a width direction substantially at right angles to the conveying direction of the web W. The travel device 24 includes a support frame 28, a pair of guide rails 30 disposed on the support frame 28, and a transfer table 26 movably supported by the pair of guide rails 30. The transfer table 26 is fixed to a belt 34 via a connecting plate 33. The conveyor belt 34 is wound around a pulley 32. The conveyor belt 34 is reciprocated by a pulley drive motor (not shown). A rack 54 is fixed to the support frame 28 of the travel device 24.

The mesh cutting device 1 includes a pair of rotary cutters 16 and rotary cutters 18, and is disposed on a pair of rotary cutters 16 and a pair of right and left rolls 44, rolls 46, and rolls on both sides of the rotary cutter 18. 48. Roll 50, and a pair of additional rolls 80 and rolls 82. Further, the mesh cutting device 1 includes an upper casing 10 for protecting the rolls 44, the rolls 46, the rolls 48, the rolls 50 and the additional pair of rolls 80, the rolls 82, the upper casing 11 and the lower casing 12, and the lower casing 14 . A gap for passing the mesh W is formed between the upper casing 10, the upper casing 11 and the lower casing 12, and the lower casing 14. As shown in FIG. 5, the upper casing 10, the upper casing 11, the lower casing 12, and the lower casing 14 are fixed to each other at the base by fasteners 20 such as bolts. Similarly, the distal end 11c of the arm 11b extending from the outer casing 11 toward the guide plate 40 and the guide plate 42 is fastened and fixed to the protruding portion of the lower outer casing 14 by the screw 21. The outer casing 12 and the outer casing 12 are coupled to a transfer table 26 constituting the traveling device 24 via a holder 22.

As shown in FIG. 6, the rotary cutter 16 and the rotary cutter 18 including a pair of upper and lower blades are supported by the upper housing 10, the upper housing 11, and the lower housing 12 via the respective rotary shafts 36 and the rotary shafts 38. Inside the lower casing 14. a pair The rotary cutter 16 and the rotary cutter 18 are adjacent to each other in a state in which they are vertically overlapped with a mesh therebetween. The web W is cut by causing the pair of the rotary cutter 16 and the rotary cutter 18 to cross each other in a substantially contact state. The pair of the rotary cutter 16 and the rotary cutter 18 are disposed in a state in which the extension line of the blade contact point (substantially coincident with the moving direction of the cutting point CP on the mesh) with respect to the mesh W The direction of the transfer is inclined at a predetermined angle (30° or more and 85° or less).

In front of the extension line of the pair of rotary cutters 16 and the blade contact points of the rotary cutter 18, as shown in Fig. 5, the upper casing 10, the upper casing 11, the lower casing 12, and the lower casing 14 are inclined up and down. The protruding guide arm 35 and the guide arm 37 are disposed at positions facing each other. The guide arm 35 and the guide arm 37 hold the front side of the cut portion of the mesh W from the top. As shown in FIG. 7, a pair of rolls 44 and rolls 46 are provided on the rotating shaft 36 and the rotating shaft 38 on the pair of the rotary cutter 16 and the rotary cutter 18. On the other side of the pair of the rotary cutter 16 and the rotary cutter 18, a pair of rolls 48 and 50 are provided on the rotary shaft 36 and the rotary shaft 38. A pair of rolls 44, rolls 46 and a pair of rolls 48 and rolls 50 sandwich the webs W on both sides of the rotary cutter 16 and the rotary cutter 18.

As shown in Fig. 6, an additional pair of rolls 80 and rolls 82 are disposed behind the extension lines of the pair of rotary cutters 16 and the blade contact points of the rotary cutter 18. The pair of additional rolls 80 and rolls 82 are supported by the upper casing 11, the lower casing 12, and the lower casing 14 via the rotating shaft 84 and the rotating shaft 86. The pair of additional rolls 80 and rolls 82 are disposed at a position on the downstream side of the web with respect to the direction along the extension line of the blade contact point of the rotary cutter 16 and the rotary cutter 18. The pair of additional rolls 80 and rolls 82 sandwich the web W from the thickness direction, and thus can be applied against the cut web. The tension of the transport direction of the object W. Further, it is preferable that the pair of the additional rolls 80 and the rolls 82 are disposed at an outer opening angle of 0 to 5 with respect to the extension line of the blade contact point.

FIG. 8 is a perspective view showing a drive mechanism portion of the pair of additional rolls 80 and rolls 82. The rotary shaft 84 is freely rotatable. The rotation of the rotating shaft 86 is transmitted to the roll 80 by the rotation of the roll 82, and the roll 80 performs the driven rotation. The rotating shaft 86 is rotationally driven via the gear unit 52. The gear unit 52 is driven by the movement of the rotary cutter. As shown in FIG. 4, a rack 54 is fixed to the support frame 28 of the travel device 24. The gear 56 rotatably attached to the lower casing 12 is engaged with the rack 54, so that the gear 56 rotates when the lower casing 12 moves. The pulley 58 that rotates integrally with the gear 56 rotates the intermediate gear 60 via the driven pulley 62 and the conveyor belt 64. The driven gear 66 meshes with the intermediate gear 60, and the rotating shaft 86 is coupled to the driven gear 66.

Further, the rolls 44, the rolls 46, the rolls 48, the rolls 50, the rolls 80, and the rolls 82 are produced by selecting materials such as metal, rubber, and plastic depending on the type of the web W. As the mesh W, a resin film such as a TAC (triacetate cellulose) film or a polyethylene terephthalate (PET) film, or a thin metal plate such as an aluminum film or a copper film can be used. In particular, when a film containing a brittle material such as a cellulose resin is cut, a remarkable effect can be exhibited.

Fig. 9 shows a mesh cut state when the new core 4 is wound. The mesh W is conveyed between the winding core 4 and the support roller 70 which are opposed to each other at a predetermined interval. The mesh cutting device 1 is disposed such that the guide plate 40 and the rear end of the guide plate 42 are adjacent to the winding core 4.

When the cut portion of the mesh W is reached, a drive motor (not shown) is started, and the pair of rotary cutters 16 and rotary cutters 18 are moved by the rotation of the pulleys 32 of the travel device 24. The rotary cutter 16 and the rotary cutter 18 are cut transversely with the web, and the web W is cut from one side. At this time, both sides of the cutting point CP of the mesh W are sandwiched by the pair of the left and right rolls 44, the rolls 46, the rolls 48, and the rolls 50 in the thickness direction. Further, the pair of rolls 80 and rolls 82 are added to grip the upstream of the cutting point CP in the moving direction on the web from the thickness direction and on the downstream side of the web.

Thereby, the movement of the pair of rotary cutters 16 and the rotary cutter 18 smoothly proceeds in the transverse cutting direction of the web. The mesh W is obliquely cut at an angle that coincides with the orientation of the blades of the rotary cutter 16 and the rotary cutter 18. Further, the web W is nipped by the rolls 44, the rolls 46, the rolls 48, the rolls 50, the rolls 80, and the rolls 82, and thus is not subjected to the tensile force. Therefore, the occurrence of cracking can be suppressed. Further, the nip point of the roll 44, the roll 46, the roll 48, the roll 50, the roll 80, and the roll 82 is substantially on the same plane as the cut point CP of the rotary cutter 16 and the rotary cutter 18, and thus can be sharply cut. Web W. The cut web W is guided by the guide sheets 40 and the guide sheets 42 and is not bent in the thickness direction.

When the rotary cutter 16 and the rotary cutter 18 cut the web W laterally, the rear ends of the guide sheets 40 and the guide sheets 42 are located substantially directly below the winding core 4. Thereby, the cut end of the mesh W does not cause any unstable behavior, but is guided by the winding core 4. At this time, the support roller 70 is raised to come into contact with the winding core 4. The cut web W is attached by a bonding agent on the outer circumferential surface of the winding core 4 and wound around the winding core 4.

When the winding of the web W is started, the mesh cutting device 1 is lowered by a drive mechanism (not shown), and is returned to the original position without hindering the transfer path of the mesh W.

[Examples]

Hereinafter, the present invention will be described in more detail by way of examples of the invention. However, the invention is not limited by the examples.

A cellulose triacetate film (thickness: 80 μm, width: 1500 mm) was conveyed at a tension of 200 N (total width) at a speed of 50 m/min. The cellulose triacetate film was cut during transportation and wound up on an empty core. A mesh cutting device that does not have a pair of additional rolls is used, and a plurality of mesh cutting devices having different pair of rolls and different opening angles are used to cut the mesh to be conveyed. After cutting the web, the number of breaks in the web was counted. In terms of the number of fractures, the length of the fracture was measured by a gauge, and the number of fractures having a length of 1 mm or more was counted as one. When the number of fractures is 1 or less, it is evaluated as A for an excellent level of the product, and when the number of fractures is 2 or more and 6 or less, it is evaluated as B for a product that can be used. When the number of fractures is 7 or more, it is evaluated as C for the level at which the product is unusable. Table 1 shows the conditions and evaluation results of the cut of the mesh.

In the sample 6, a mesh cutting device which does not have an additional roll was used, and thus the number of fractures was 7 or more, and the evaluation result was C. Sample 1 - Sample 5 used a mesh cutting device having an additional roll, and thus the evaluation result was A or B. According to Table 1, in the case of Sample 1 to Sample 3, when the external opening angle was 0° or more and 5° or less, the number of fractures was 1 or less, and the evaluation result was A.

1‧‧‧Mesh cutting device

2, 3, 44, 46, 48, 50, 80, 82, 90‧‧‧ rolls

4‧‧‧ Empty core

10, 11‧‧‧ upper shell

11b‧‧‧arm

11c‧‧‧ front end of arm 11b

12, 14‧‧‧ lower shell

16, 18‧‧‧ Rotary cutter

20‧‧‧fasteners

21‧‧‧ screws

22‧‧‧ bracket

24‧‧‧Transition device

26‧‧‧Mobile Station

28‧‧‧Support framework

30‧‧‧rails

32, 58‧‧‧ pulley

33‧‧‧link board

34, 64‧‧‧ conveyor belt

35, 37‧‧‧ Guide arm

36, 38‧‧‧Rotary axis

40, 42‧‧‧ guide board

52‧‧‧ Gears

54‧‧‧Rack

56‧‧‧ Gears

60‧‧‧Intermediate gear

62, 66‧‧‧ driven pulley

70‧‧‧Support roll

84, 86‧‧‧Rotary axis

A‧‧‧ cut point CP moving direction

CP‧‧‧ cut point

W‧‧‧ mesh

θ‧‧‧Outer corner

Fig. 1 is a schematic view showing a cut state of a mesh according to an embodiment of the present invention.

Fig. 2 is a view for explaining an outer opening angle of an additional pair of rolls.

Fig. 3 is a schematic view showing a cut state of a mesh according to another embodiment.

Fig. 4 is a plan view showing the entirety of a mesh cutting device.

Fig. 5 is an enlarged view of a main part of the mesh cutting device.

Fig. 6 is a perspective view of the outer casing in which the rotary cutter is omitted.

Fig. 7 is an enlarged view of a main part of the mesh cutting device.

Fig. 8 is a perspective view showing a rotary cutter portion.

Fig. 9 is a view showing a state in which a mesh is cut by a mesh cutting device according to an embodiment of the present invention.

Fig. 10 is a schematic view showing a cut state of a mesh by a previous mesh cutting device.

Fig. 11 is a schematic view showing a broken state of a mesh caused by a conventional mesh cutting device.

4‧‧‧ Empty core

44, 48, 80‧‧‧ rolls

A‧‧‧ cut point CP moving direction

CP‧‧‧ cut point

W‧‧‧ mesh

Claims (5)

A mesh cutting method includes the steps of: applying a tension to a mesh to carry the conveyance; and cutting the conveyed web in the width direction while moving the upper blade and the lower blade. In the step of breaking the mesh, two nip points on the upstream side of the web located at the cutting point of the upper blade and the lower blade and the downstream side of the mesh are sandwiched from the thickness direction of the mesh Holding the mesh, and holding the net from the thickness direction of the mesh at a nip point upstream of the moving direction on the mesh and at a downstream side of the mesh at the cutting point a cutting point, two nip points on the upstream side of the web located at the cutting point and the downstream side of the web, and upstream of the moving direction on the web at the cutting point The nip point is on the same side. The mesh cutting method according to claim 1, wherein the mesh is oriented toward the upstream side of the mesh at a nip point upstream of the moving direction on the mesh at the cutting point Apply force in the direction. The mesh cutting method according to the above-mentioned item, wherein the mesh comprises a cellulose resin. A mesh cutting device for cutting a conveyed web in a width direction, and comprising: a pair of rotary cutters including an upper edge and a lower edge; The pair of left and right rolls are disposed on both sides of the cutting point of the upper blade and the lower blade, and are located at two nip points on the upstream side of the mesh at the cutting point and on the downstream side of the mesh. The mesh is sandwiched from the thickness direction of the mesh; an additional pair of rolls are located upstream of the moving direction of the mesh at the cutting point and at a nip point on the downstream side of the mesh And the moving device, wherein the pair of rotary cutters, the pair of left and right rolls, and the pair of additional rolls are moved along the width direction of the mesh, and the cutting is performed a point at which the upstream side of the web at the cutting point and the two nips of the pair of left and right rolls on the downstream side of the web and the above-mentioned cutting point are upstream of the moving direction of the web The nip point of the additional pair of rolls is on the same side. The mesh cutting device according to claim 4, wherein the additional roll is 0° or more and 5° to 0° with respect to a moving direction of the cutting point on the mesh. The angle is configured.