JP2009262309A - Sheet material cutting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sheet material cutting device capable of solving the problem in a partial cut by a simple means that an uncut portion is left in the center part of the sheet material in the cutting width direction. <P>SOLUTION: The sheet material cutting device is provided with a movable cutting blade with a blade edge depressed in a V-shape toward the center in the width direction of the sheet material, a fixed blade with a blade edge disposed nearly parallel with a sheet surface of the sheet material intersecting with the movable cutting blade while keeping pressure-contact to cut the sheet material, and protruding blade edges disposed on the V-shape top of the movable blade protruding in the cutting direction. The protruding blade edges can be saw-toothed. The side of the protruding blade edges facing the fixed blade side preferably has an inclined surface inclining toward the cutting direction. A depressed area adjacent to both sides of the protruding blade edges in the width direction preferably has notches. In an engagement between the fixed blade and the protruding blade edges of the movable blade, a clearance is preferably provided between a distal end portion of the protruding blade edges and the fixed blade. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention is formed by combining perforations by partially cutting sheet materials printed by a register, ticket vending machine, printer, etc., or by partially cutting a stub portion such as a concert ticket or an admission ticket. The present invention relates to a sheet material cutting device suitable for a use.

  Compared to full-width cutting (hereinafter referred to as full cut), which cuts the sheet material completely, partial cutting (hereinafter referred to as partial cut) that leaves part of the sheet material is lost due to falling sheet material after cutting. This has the advantage of preventing problems such as For this reason, conventionally, various sheet material cutting devices corresponding to partial cut have been proposed. For example, the sheet material cutting device proposed in Patent Document 1 is a partial cut-off in the center of the sheet material in the width direction by a narrow notch formed at the top of the blade tip that is recessed in a V shape of the movable blade. Cut is possible.

JP-A-6-47696

  According to the sheet material cutting device proposed in Patent Document 1, the sheet material can be partially cut by a narrow notch formed at the top of the blade edge that is recessed in a V-shape of the movable blade, and the sheet material after cutting A narrow uncut portion is formed by the notch. When the width of the uncut portion is narrow, it is easy to cut off the sheet material. However, for example, the sheet material after cutting is rotated by an air flow such as indoor or outdoor air, so that the front and back surfaces are mixed, or the sheet material hangs down for a long time and the uncut portion is broken by the weight of the sheet material. Inconveniences such as doing this may occur.

  In order to prevent such inconvenience, for example, a means for forming a wide notch in the movable blade can be considered. However, since a wide notch portion is formed by the wide notch, the breaking strength of the uncut portion becomes high, and when the sheet material is cut off after cutting, for example, a severely cut mark that detracts from the aesthetic appearance of the sheet material. There is a possibility that a defect such as formation or shredding of a shredded bite into a printed part may occur.

  An object of the present invention is to provide a sheet material cutting device that can solve the above-described problems with a simple means in a partial cut in which a sheet material is left uncut in the central portion in the cutting width direction to form a portion.

The present inventor has found that the above-mentioned problems can be solved by forming a protruding blade edge protruding in the cutting direction at the V-shaped top of the blade edge of the movable blade, and has reached the present invention.
That is, in the present invention, a movable blade having a V-shaped cutting edge toward the center in the width direction intersects with a fixed blade having a cutting edge arranged substantially parallel to the sheet surface of the sheet material while being pressed against each other. A sheet material cutting device for cutting the sheet material, the sheet material cutting device having a protruding blade edge protruding in a cutting direction at a V-shaped top of the blade edge of the movable blade.

  In the present invention, the protruding blade edge can be formed in a saw blade shape.

  Moreover, it is preferable to have an inclined surface which inclines toward the cutting direction on the side surface opposite to the fixed blade side in the protruding blade edge.

  Moreover, it is preferable to have a notch in the hollow adjacent to the width direction both sides of the said protruding blade edge.

  Desirably, a gap is provided between the tip of the protruding blade tip and the fixed blade in meshing between the fixed blade and the movable blade.

  When the sheet material is partially cut, the sheet material cutting apparatus of the present invention can form a plurality of narrow uncut portions in the cutting width direction at the center portion in the width direction of the sheet material. Thereby, when the sheet material is cut off after cutting, the cut marks do not impair the aesthetic appearance of the sheet material. Further, the sheet material after cutting becomes difficult to rotate, and it becomes difficult to break due to the weight of the sheet material. Therefore, the sheet material cutting device of the present invention is an industrially useful technique.

  An important feature of the present invention is that a configuration having a protruding blade edge protruding in the cutting direction at the V-shaped top of the blade edge of the movable blade is employed. With this configuration, the sheet material can be cut toward the center in the width direction by the V-shaped cutting edge of the movable blade, and a plurality of narrow uncut portions are formed in the width direction at the center portion in the width direction of the sheet material. can do.

  In the present invention, as described above, a plurality of uncut portions to be formed in the central portion in the cutting width direction of the sheet material at the time of partial cutting, and by narrowing each uncut portion, uncut portions are The entire width can be increased. Thereby, it can suppress that the breaking strength of each uncut portion becomes high. For this reason, the force that acts when cutting the sheet material can be concentrated at each uncut portion of the narrow width. Therefore, when the sheet material is cut off, it can be broken at the uncut portion. Further, by having the uncut portion that is wider than before, the sheet material can be made difficult to rotate after cutting, and the sheet material can be made difficult to break by its own weight at the uncut portion.

  As described above, the present invention has a configuration in which the movable blade has a protruding blade edge, thereby combining the operational effect obtained by widening the portion to be left by partial cutting with the operational effect of the narrow uncut portion. It has a completely new sheet material cutting device that has never existed before.

  In the basic configuration related to the cutting of the present invention, a movable blade having a V-shaped cutting edge toward the center in the width direction and a fixed blade having a cutting edge disposed substantially parallel to the sheet surface of the sheet material are pressed against each other. A sheet material cutting device that intersects and cuts the sheet material. In this basic configuration, the cutting edge of the movable blade and the cutting edge of the fixed blade intersect with each other while being in pressure contact with each other, and the cutting edge of the movable blade slides along the cutting edge of the fixed blade. And the sheet | seat material inserted between the blade edge | tip of a movable blade and the blade edge | tip of a fixed blade can be cut | disconnected stably and reliably.

  Moreover, in this invention, the sheet | seat material can be cut | disconnected substantially simultaneously toward the center from the width direction both ends by making the blade edge of a movable blade into the shape dented in the V shape toward the width direction center. In addition, the force acting in the direction of twisting the sheet material can be reduced by pressing the sheet material with the blade edge of the movable blade. As a result, the sheet material is not pushed by the movable blade and is not shifted or tilted, and a problem that the cut end of the sheet material becomes uneven or wrinkled can be prevented. Then, by making it difficult for wrinkles to occur at the cut end of the sheet material during cutting, it becomes possible to stab the protruding blade tip provided on the movable blade accurately and stably with respect to the sheet surface of the sheet material.

  In the present invention, as described above, there is an important feature in forming the protruding blade edge protruding in the cutting direction on the V-shaped top of the blade edge of the movable blade. In the present invention, the protruding cutting edge formed on the movable blade is not limited as long as the protruding cutting edge pierces the sheet material, so long as the sheet material can be partially cut as if the protruding cutting edge forms a perforation. It may be a shape or size. For example, the protruding blade edges 6a, 6b, and 6c having the shapes shown in FIGS. 3A to 3C can be formed at the V-shaped top of the blade edge of the movable blade.

  The protruding blade edge 6a shown in FIG. 3A is in the cutting direction which is the moving direction of the movable blade 2a when cutting a sheet material (not shown) at the V-shaped top of the blade edge 5 of the movable blade 2a. Projecting with a triangular shape. When the sheet material is partially cut using the movable blade 2a having such a protruding blade edge 6a, the sheet material S at the time of partial cutting is formed with respect to the blade edge 5 and the protruding blade edge 6a that are recessed in a V shape of the movable blade 2a (see FIG. It is possible to control the movable blade 2a to stop at a position corresponding to the position indicated by the middle S (two-dot chain line). Thereby, the sheet material after partial cut can be made into the partial cut state shown in FIG. In FIGS. 6A, 6B, and 7, the cut portions of the sheet material are exaggerated for clarity.

  Further, the protruding blade edge 6b shown in FIG. 3 (b) protrudes with a substantially parallel portion 6f in the cutting direction with the V-shaped top of the blade edge 5 of the movable blade 2b as a base, and the distal end side of the substantially parallel portion 6f is protruded. It has a triangular shape. When the sheet material is partially cut by using the movable blade 2b having such a protruding blade edge 6b, the sheet material S at the time of partial cutting is formed with respect to the blade edge 5 and the protruding blade edge 6b that are recessed in a V shape of the movable blade 2b (see FIG. It is possible to control the movable blade 2b to stop at a position corresponding to the position indicated by the middle S (two-dot chain line). Thereby, the sheet material after the partial cut can be set to the partial cut state shown in FIG. 6A, for example, similar to the case of the protruding blade edge 6a described above. In the case of the protruding blade edge 6b having the substantially parallel portion 6f described above, the cutting width of the sheet material by the piercing of the protruding blade edge 6b can be set to be substantially the same as the width of the substantially parallel portion 6f of the protruding blade edge 6b. Have advantages.

  Further, the protruding blade edge 6c shown in FIG. 3 (c) protrudes from the V-shaped top of the cutting edge 5 of the movable blade 2c with a substantially parallel portion 6f like the protruding blade edge 6b described above, and the substantially parallel portion 6f. It is formed in the shape which has a hollow in the center part of the blade edge | tip of the front-end | tip side. When the sheet material is partially cut using the movable blade 2c having such a protruding blade edge 6c, the sheet material S at the time of partial cutting is formed on the cutting edge 5 and the protruding blade edge 6c that are recessed in a V shape of the movable blade 2c (see FIG. It is possible to control the movable blade 2c to stop at a position corresponding to the position indicated by the middle S (two-dot chain line). Thereby, the sheet material after the partial cut can be set to the partial cut state shown in FIG. 6A, for example, similar to the case of the protruding blade edges 6a and 6b described above.

In the case of the protruding blade edge 6c, the sharper cutting edge 6e on both sides of the recess provided in the central portion of the protruding cutting edge side is preferable because the load when piercing the sheet material is reduced. Thereafter, the sheet material can be cut toward the center in the cutting width direction by a recess provided between the sharp blade edges 6e. Then, similarly to the protruding blade edge 6b described above, the cutting width of the sheet material by piercing by the substantially parallel portion 6f formed at the base of the V-shaped recess of the movable blade 2c is substantially the same as the width of the substantially parallel portion 6f. Can be set to
In the case of the movable blades 2a to 2c described above, the movable blades 2a to 2c are stopped at positions that do not exceed the boundary line with the inclined surface that is preferably formed on the protruding blade edges 6a to 6d. In addition, you may stop the movable blades 2a-2c in the position exceeding the boundary line with the said inclined surface.

  Moreover, in this invention, the protruding blade edge which has the shape which has arrange | positioned two or more of the above-mentioned protruding blade edges 6a-6c can be provided in a movable blade, and this means making the protruding blade edge formed in a movable blade into a saw blade shape. To do. By forming the protruding blade edge of the movable blade in a saw blade shape, that is, by having a plurality of protruding blade edges, a plurality of narrow uncut portions can be formed simultaneously. Thereby, compared with the case where the partial cutting is performed with the protruding blade edges 6a to 6c described above, it is possible to further widen the uncut portion left after the partial cutting. In addition, it is possible to form a plurality of separation portions each of which is narrowed in the uncut portions that are further widened. Therefore, since the uncut portion is widened, the sheet material can be made difficult to rotate easily, and can be made difficult to break even by the weight of the sheet material. In addition, since each uncut portion is narrowed, it is possible to easily cut a thousand pieces after cutting.

  As the above-mentioned saw blade-like protruding cutting edge, for example, a protruding cutting edge 6d shown in FIG. 4 can be provided. The protruding blade edge 6d is formed to have a saw blade shape at the top of the V-shaped depression of the cutting edge 5 of the movable blade 2d, and two protruding blade edges 6b shown in FIG. In addition, each of the two cutting edges of the protruding cutting edge 6b has a shape in which a notch is formed in a recess adjacent to both sides in the width direction. When the sheet material is partially cut using the movable blade 2d having such a protruding blade edge 6d, the position of the sheet material at the time of partial cutting is determined with respect to the blade edge 5 and the protruding blade edge 6d that are recessed in a V shape of the movable blade 2d. The movable blade 2d can be controlled to stop at a position corresponding to the two-dot chain line indicated by S in the figure. In this case, the movable blade 2d is stopped at a position exceeding the boundary line with the inclined surface which is preferably formed on the protruding blade edge 6d. The movable blade 2d may be stopped at a position that does not exceed the boundary line with the inclined surface. Thereby, the sheet material after the partial cut can be made into a partial cut state in which, for example, three uncut portions shown in FIG. 6B are formed.

  The partial cut state in which three portions at the central portion in the width direction shown in FIG. 6B are left as the full width of the left uncut portion than the partial cut state in which two portions in the central portion in the width direction shown in FIG. Can be widened. And although the overall width is wide, each uncut portion can be made as narrow as when two portions are left, so it is desirable because it has the advantage that the sheet material can be easily cut off. .

  Moreover, in this invention, it is preferable that the protrusion blade edge | tip provided in a movable blade has an inclined surface which inclines toward a cutting direction in the side surface opposite to the fixed blade side in this protrusion blade edge | tip. By providing the inclined surface on the protruding blade edge, the tip of the protruding blade edge can be made a sharper blade edge. Thereby, the resistance force when the protruding blade edge pierces the sheet material can be reduced, and the protruding blade edge can be smoothly pierced with respect to the sheet material. In addition, the breakage of the cut end of the sheet material formed by the piercing of the protruding blade edge can be suppressed to the minimum, and thereby a beautiful cut end can be obtained.

  An example of the inclined surface provided in the protruding blade edge is shown in FIGS. 5 (a) to 5 (c). The inclined surface 16a shown in FIG. 5A is formed by providing a flat surface formed on one side of the protruding blade edge 6 on the side opposite to the side surface 14 on the fixed blade side, whereby the tip of the protruding blade edge 6 is formed. A sharper blade edge 15 can be formed with respect to the portion. Further, the inclined surface 16b shown in FIG. 5 (b) is formed by providing a curved surface on the side surface opposite to the side surface 14 on the fixed blade side of the protruding blade edge 6, and thereby, similarly to the inclined surface 16a described above, The tip of the protruding blade edge 6 can be made a sharper blade edge 15.

  Moreover, you may form the inclined surface provided in a protrusion blade edge | tip by combining multiple planes and curved surfaces mentioned above. For example, the inclined surface shown in FIG. 5 (c) is formed by combining two flat surfaces 16c and 16d, and the tip of the cutting edge 6 is sharpened by the flat surface 16b as in the case of the inclined surfaces 16a and 16b described above. The cutting edge 15 can be obtained. Note that a plurality of surfaces to be combined can be curved surfaces.

  Moreover, in this invention, it is preferable to have a notch in the hollow adjacent to the width direction both sides of the protrusion blade edge | tip of the said movable blade. As the notches, for example, as shown in FIG. 4, three notches 7 can be provided adjacent to both sides in the width direction of the two protruding blade edges 6d. By providing the notches in the recesses adjacent to both sides in the width direction of the protruding blade tip, the movable allowable range of the movable blade can be widened by the depth effective as the notch. By widening the movable allowable range of the movable blade, the allowable range of the stop position accuracy of the movable blade at the time of partial cut can also be set wide, so that the partial cut operation can be further stabilized. Further, by providing the notches themselves with a substantially parallel width, the uncut width of the sheet material can be set to be the same as the notch width, and variations in the uncut width can be eliminated.

  Preferably, in the present invention, a gap is provided between the tip of the protruding blade tip and the fixed blade in meshing between the fixed blade and the movable blade. When cutting the sheet material, the fixed blade and the movable blade intersect while pressing, so depending on the dimensional accuracy and assembly accuracy of each part of the sheet material cutting device, the protruding blade tip provided at the center in the width direction of the movable blade The tip may collide with the fixed blade. Therefore, in order to reliably avoid the collision between the protruding blade edge and the fixed blade, it is desirable to provide a gap between the distal end portion of the protruding blade edge and the fixed blade as described above.

  The gap provided between the tip of the protruding blade tip and the fixed blade may be formed, for example, by means of slightly bending the tip of the protruding blade tip toward the side away from the fixed blade. Further, for example, a means for slightly polishing the side surface on the fixed blade side of the tip portion of the protruding blade tip may be used. The slight amount mentioned above means that the distance between the tip of the protruding blade edge and the fixed blade is a change amount corresponding to 5 to 30% of the thickness of the movable blade or the protruding blade edge in the direction of pressure contact with the fixed blade, for example, bending. Means the amount and polishing amount.

The sheet material cutting device of the present invention (hereinafter referred to as the present cutting device) will be described in detail using an example with reference to the drawings.
FIG. 1 is a block diagram showing an example of a sheet material cutting device according to the present invention. FIGS. 1 (a) and 1 (b) are block diagrams of the sheet material (not shown) viewed from the insertion side, and FIG. ) Is a side view of FIG. 1A shows a state where the movable blade 2 is stopped at the top dead center position, that is, a state where the movable blade 2 is in a standby position before cutting the sheet material, and FIG. The state which has stopped at the dead center position, that is, the state where the sheet material has been cut is shown.

First, the configuration of the cutting apparatus shown in FIG. 1 will be described.
This cutting device is a sheet material cutting device that cuts a sheet material (not shown) while the fixed blade 1 and the movable blade 2 intersect while being pressed.
The fixed blade 1 was disposed extending in the width direction of the sheet material, and the blade edge 4 was disposed so as to be substantially parallel to the sheet surface of the sheet material. The fixed blade 1 is formed by press punching a stainless steel knife having a thickness of 0.7 mm, and has a total width of 95 mm and a cutting range of 85 mm. The cutting edge 4 of the fixed blade 1 was ground so that the cutting edge angle was 60 degrees.

  The movable blade 2 has a shape having a cutting edge 5 that is recessed in a V shape toward the center in the width direction, and is arranged such that the cutting edge 5 of the movable blade 2 intersects with the cutting edge 4 of the fixed blade 1 while being pressed. The movable blade 2, like the fixed blade 1, is formed by press punching a stainless steel knife having a thickness of 0.7 mm and has a total width of 95 mm and a cutting range of 85 mm. Moreover, the guide part 8 was provided in the both ends used as the cutting direction side of the movable blade 2, ie, the cutting start side of a sheet material. When the movable blade 2 meshes with the fixed blade 1, the guide portion 8 is first brought into contact with the blade edge 4 of the fixed blade 1, and then the blade edge 5 of the movable blade 2 is guided to the blade edge 4 of the fixed blade 1. Thereby, the fixed blade 1 and the movable blade 2 can be smoothly engaged. Further, the movable blade 2 is configured to be provided with a frame 3 that supports the moving direction of the movable blade 2, that is, the cutting direction and the separating direction, and the pressure contact direction of the movable blade 2 to the fixed blade 1.

  The blade edge 5 of the movable blade 2 has an angle of 162 degrees and is recessed in a V shape. And the protrusion blade edge | tip 6 which protrudes in a cutting | disconnection direction was formed in the top part of the blade edge | tip 5. As shown in FIG. The protruding cutting edge 6 has a so-called saw blade shape having two cutting edges, the width in the cutting width direction is 2 mm, the angle of the triangular cutting edge at the tip is 90 degrees, and the fixed blade at the protruding cutting edge 6 is fixed. An inclined surface having an inclination of 25 degrees toward the cutting edge 5 of the movable blade 2 was formed by polishing on the side surface opposite to the side. Moreover, the notch 7 was formed in each hollow adjacent to the width direction both sides of the two blade edges of the protruding blade edge 6, and the width of the parallel part of the three notches 7 was 2 mm. Further, the side surface of the protruding blade edge 6 on the fixed blade 1 side is polished by 0.1 mm corresponding to about 15% of the plate thickness of the movable blade 2 so that a gap is formed between the protruding blade edge 6 and the fixed blade 1. I made it.

  As described above, the communicating blade 12 is provided in the movable blade 2 supported by the frame 3, and the drive pin 11 for moving the movable blade 2 in the cutting direction and the separating direction is communicated. The drive pin 11 was fixed to the wheel 10 with a predetermined distance from the rotation axis of the wheel 10. The wheel 10 is connected to a motor 9 that is a drive source for driving the movable blade 2 via a gear 13. Thereby, the rotation of the motor 9 is transmitted to the drive pin 11 via the gear 13 and the wheel 10, and the drive pin 11 is rotationally moved by the rotation of the wheel 10 with the predetermined distance as the rotation radius. Then, the movable blade 2 and the wheel 10 are configured to perform a crank motion via the drive pin 11.

Next, the operation when the sheet material is partially cut using the cutting apparatus having the above-described configuration will be described.
When the motor 9 is driven to rotate and the wheel 10 is rotated via the gear 13, the drive pin 11 provided on the wheel 10 rotates with a rotation locus. The rotated drive pin 11 comes into contact with and presses the end surface on the cutting direction side of the communication hole 12 of the movable blade 2 that communicates with the drive pin 11, whereby the movable blade 2 starts to move in the cutting direction. The movable blade 2 moved in the cutting direction moves substantially perpendicular to the sheet surface of the sheet material (not shown), and the guide portion 8 of the movable blade 2 first comes into contact with the cutting edge 4 of the fixed blade 1. Next, the guide unit 8 guides the cutting edge 5 of the movable blade 2 to the cutting edge 4 of the fixed blade 1, and the movable blade 2 further moves in the cutting direction while meshing with the fixed blade 2. The sheet material inserted into the insertion port 18 provided between the fixed blade 1 and the movable blade 2 can be cut by the moving operation of the movable blade 2 described above.

  In the above-described cutting of the sheet material, the sheet material is first cut by the cutting edge 5 that is recessed in a V shape of the movable blade 2 from both sides in the width direction toward the center. Then, at the final stage of cutting, the protruding blade edge 6 provided at the central portion in the cutting width direction of the movable blade 2 pierces the sheet material, and thereby the cutting of the sheet material is completed. At this time, the portion of the sheet material corresponding to the position of the notch 7 adjacent to the protruding blade edge 6 is not cut, and a notch portion having a width substantially the same as the width 2 mm of the parallel portion of the notch 7 is formed. The sheet material is partially cut.

  After the movable blade 2 obtained by partially cutting the sheet material has moved to the bottom dead center position shown in FIG. 1B, the drive pin 11 further rotates to contact the end surface of the movable blade 2 on the side in the separation direction. The movable blade 2 reverses the moving direction toward the separating direction. Then, the arrival at the top dead center position shown in FIG. 1A is detected by a microswitch (not shown), and the rotation of the motor 9 is stopped based on the detection signal, whereby the movable blade 2 is moved. Stopped.

  Through the series of operations described above, the sheet material can be partially cut using the cutting apparatus. That is, the rotary motion of the wheel 10 is converted into a linear motion in the cutting direction of the movable blade 2 by the drive pin 11 to partially cut the sheet material, and then the rotational motion of the wheel 10 is further moved by the drive pin 11 of the movable blade 2. The movable blade 2 can be returned to the standby position by converting it into a linear motion in the separating direction.

Next, using this cutting device, three types of thickness 0.085 mm (Oji Paper White Yamayuri DX), thickness 0.179 mm (NBS Ricoh 135 kg), 0.231 mm (NBS Ricoh 180 kg) A cutting test was performed using the sheet material as a material to be cut. As a result, any sheet material could be partially cut. FIG. 6B schematically shows cut traces of the partially cut sheet material (hereinafter referred to as test piece A). The cut mark of the test piece A has a form having three uncut portions 17 near the center in the width direction of the sheet material 18, and the width of the uncut portions 17 is a parallel portion of the notch 7 provided in the movable blade 2. It was 2 mm which is the same as the width.
The above-described cutting test is repeatedly performed, and the uncut portion 17 formed in the sheet material 18 has no substantial width variation, no defects such as breakage and chipping are recognized, and a stable partial cut state is obtained. I was able to confirm.

Next, for comparison with the present cutting device, a conventional sheet material cutting device (hereinafter referred to as a conventional cutting device) will be briefly described.
FIG. 2 is a configuration diagram illustrating an example of a conventional cutting device. 2 (a) and 2 (b) are configuration diagrams viewed from the sheet material insertion side, as in FIG. 1 (a). FIG. 2C is a side view of FIG. 2A shows a state where the movable blade 2 is stopped at the top dead center position, that is, a state where the movable blade 2 is in a standby position before cutting the sheet material, and FIG. It shows a state where it is stopped at the dead center position, that is, a state where the sheet material has been partially cut. The configuration of the conventional cutting device is such that the movable blade 2 ′ is not provided with the protruding blade edge 6 of the movable blade 2 and the notch 7 adjacent thereto in the cutting device, and the V-shape of the blade edge 5 ′ of the movable blade 2 ′. The only difference is that one notch 7 'is provided at the top of the. Further, the series of operations of the movable blade 2 ′ is the same as that of the present cutting apparatus, but the cut marks of the partially cut sheet material are different.

  Using a conventional cutting device, a cutting test similar to that of the above-described cutting device was performed. In addition, the to-be-cut material used is the same as that of the case of this cutting device. As a result, any sheet material could be partially cut. FIG. 7 schematically shows cut traces of a partially cut sheet material (hereinafter referred to as “test piece B”). The cut mark of the test piece B had a form having one uncut portion 17 near the center of the sheet material 18 in the width direction. The width of the uncut portion 17 was 2 mm, which is the same as the width of the parallel portion of the notch 7 ′ provided in the movable blade 2 ′.

  Next, a pulling and cutting test was performed using the partially cut sheet materials (test piece A and test piece B) obtained by a cutting test using the present cutting apparatus and the conventional cutting apparatus. When the uncut portion 17 was shredded in the width direction of the sheet material, when the force required for shredding was measured with a spring alone, the test piece A and the test piece B showed almost the same value. On the other hand, when the uncut portion 17 was torn in the conveying direction perpendicular to the width direction of the sheet material, the force required for the torn shredding showed that the test piece A was almost three times as large as the test piece B. From this, it was confirmed that even the test piece A having three uncut portions can be torn off with almost the same force as the test piece B having one uncut portion.

  Further, when the state of the shredded marks was observed, no breakage was observed in the state where both the test piece A and the test piece B impaired the aesthetic appearance when it was cut into the width direction of the sheet material. In the case where the sheet was cut into pieces in the conveying direction, the cut pieces in the test piece B were in a state of breaking about 2 mm with respect to the sheet material. However, the shredded marks in the test piece A were only about 0.5 mm biting into the sheet material at the maximum. From this, it was confirmed that the test piece A was more difficult to break than the test piece B even if the self-weight of the sheet material acted on the uncut portion due to the continuous partial cut sheet materials.

  Next, using the present cutting device and the conventional cutting device, the test piece A in a state where five pieces of sheet materials (test piece A and test piece B) partially cut by continuously cutting the material to be cut are connected. 'And test piece B' were obtained. And when air current was given to the test piece A ′ and the test piece B ′ with a blower, the test piece B ′ was rotated by twisting the uncut portion, and the front and back surfaces seem to be mixed from one direction. It has become. On the other hand, even though the test piece A 'was pushed and swayed by the airflow, it did not rotate and twist like the test piece B'. From this, each uncut portion of the test piece A ′ has the same narrow width as the uncut portion of the test piece B ′, but the entire width of the uncut portion is widened so that it is difficult to rotate. It was recognized.

  As described above, when the sheet material is partially cut, the sheet material cutting device of the present invention can form a plurality of narrow portions to be cut in the cutting width direction at the central portion in the width direction of the sheet material. When a piece of material is cut off, the cut pieces do not impair the appearance of the sheet material. In addition, the sheet material after cutting is difficult to rotate, and it is difficult to break due to the weight of the sheet material. It was confirmed that it was a cutting device.

It is a block diagram which shows an example of the sheet | seat material cutting device of this invention. It is a block diagram which shows an example of the conventional sheet | seat material cutting device. It is a schematic diagram which shows an example of the protrusion blade edge | tip in this invention. It is a schematic diagram which shows an example of the protrusion blade edge | tip in this invention. It is a schematic diagram which shows the cross section of an example of the protrusion blade edge | tip in this invention. It is a schematic diagram which shows an example of the sheet material partially cut using the sheet material cutting device of the present invention. It is a schematic diagram which shows an example of the sheet material partially cut using the conventional sheet material cutting device.

Explanation of symbols

1. Fixed blade, 2. Movable blade, 2a, 2b, 2c, 2d. Movable blade, 2 '. 2. movable blade; Frame, 4. 4. Cutting edge, Cutting edge, 5 '. Cutting edge, 6. Projecting blade edge, 6a, 6b, 6c, 6d. Protruding edge, 6f. 6. a substantially parallel part; Notch, 8 8. Guide part, Motor, 10. Wheel, 11. Drive pin, 12. 12. communication hole; Gear, 14. 15. Side surface of fixed blade side, Cutting edge, 16a, 16b, 16c, 16d. Inclined surface, 17. Uncut part, 18. Insertion slot, S: Sheet material

Claims (5)

  A movable blade having a cutting edge recessed in a V shape toward the center in the width direction and a fixed blade having a cutting edge arranged substantially parallel to the sheet surface of the sheet material intersect to cut the sheet material while being in pressure contact with each other. A sheet material cutting apparatus, comprising: a protruding blade edge protruding in a cutting direction at a V-shaped top portion of the blade edge of the movable blade.   The sheet material cutting device according to claim 1, wherein the protruding blade tip has a saw blade shape.   3. The sheet material cutting device according to claim 1, wherein the protruding blade edge has an inclined surface inclined toward a cutting direction on a side surface opposite to the fixed blade side.   The sheet material cutting device according to any one of claims 1 to 3, wherein the recesses adjacent to both sides in the width direction of the protruding blade edge have notches.   The sheet material cutting device according to any one of claims 1 to 4, wherein a gap is provided between a tip end portion of the protruding blade tip and the fixed blade in meshing of the fixed blade and the movable blade.