Nick forming device for punching blade

Abstract

To provide a nick formation device for a punching blade which can easily form nicks in the uniform size.SOLUTION: A nick formation device 1 includes: a movable part 4 which has a blade section that can deform a blade tip of a punching blade provided in a punching die and can move forward along with the blade section; and a striking part 6 which strikes the movable part 4 to move it forward. In the state where the blade section is in contact with the punching blade, the striking part 6 strikes the movable part 4 with a constant force, the blade section moves toward the punching blade side along with the movable part 4 to deform the punching blade, thereby forming a nick in the punching blade.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a nick forming device for forming nicks in a punching blade used in a punching die. [Background technology]

[0002] When punching a sheet with a punching die, if the punched product portion and the unnecessary portion of the sheet easily separate, problems such as the need to stop the machine may arise. Therefore, in order to temporarily connect these product portion and unnecessary portion, a nick may be formed in the punching blade. A nick is formed by deforming a portion of the cutting edge of the punching blade so that it no longer functions as a blade. Specifically, a nick is formed by cutting or grinding off a portion of the cutting edge. Furthermore, bending or crushing a portion of the cutting edge may also result in the formation of a nick, as this may cause that portion to no longer function as a blade. This nick keeps the product portion and the unnecessary portion partially connected, thereby preventing them from easily separating.

[0003] Nicks are formed when the punching die is manufactured or when punching is performed after its manufacture. In the former case, nicks are often formed using a dedicated device such as a grinder. Patent Document 1 discloses a nick-making machine, which is an example of such a dedicated device. In contrast, in the latter case, since it is difficult to use a grinder or the like, nicks are often formed manually using a simple tool. For example, nicks are formed by placing the cutting edge of a small blade against the punching blade and then hitting the grip end of the blade with a hammer. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2006-26877 Summary of the Invention [Problem to be solved by the invention]

[0005] As described above, when nicks are formed manually using a simple tool, problems arise, such as variations in the width and depth of nicks depending on the worker, or nicks of different sizes being formed each time due to differences in the amount of force applied even by the same worker, which results in problems such as a loss of aesthetic appeal of the product.

[0006] The present invention has been made in view of the above circumstances, and its main object is to provide a nick forming device for a punching blade that can solve the above problems. [Means for solving the problem]

[0007] In order to solve the above-mentioned problems, one embodiment of the present invention is a nick forming device for a punching blade, which forms nicks in a punching blade provided in a punching die, and which is equipped with a movable part having a blade part that can deform the cutting edge of the punching blade and that can move in one direction together with the blade part, and an impact part that strikes the movable part to move it in the one direction, and while the blade part is held at a fixed distance from the cutting edge of the punching blade, the impact part strikes the movable part with a fixed force, and as a result, the blade part moves toward the punching blade together with the movable part, deforming a part of the cutting edge of the punching blade and thereby forming a nick in the punching blade.

[0008] In this aspect, the device may further include an operating lever that controls the impact of the impact unit and can be operated by the fingers of a hand, and is configured so that when the operating lever is operated a certain amount while the blade unit is held at a certain distance from the cutting edge of the punching blade, the impact unit will strike the movable unit with a certain force.

[0009] In addition, in the above aspect, the striking portion may have a spring connected to the operating lever, and may be configured to strike the movable portion with the spring force when the operating lever is operated a certain amount against the spring.

[0010] In addition, in the above aspect, the nicking device may be pistol-shaped, the operating lever may be a trigger that can be rotated by the fingers of a hand, and the striking portion may be configured to strike the movable portion when the operating lever is rotated a certain amount.

[0011] In the above aspect, the blade portion may be detachably attached to the tip end of the movable portion. [Effects of the Invention]

[0012] The nick forming device for a punching blade according to the present invention makes it possible to easily form nicks of uniform size. [Brief explanation of the drawings]

[0013] [Figure 1] FIG. 2 is a side view showing the configuration of a nick forming device according to an embodiment. [Figure 2] FIG. 1 is a front view showing the configuration of a nick forming device according to an embodiment. [Figure 3A] FIG. [Figure 3B] FIG. [Figure 3C] FIG. [Figure 4A] FIG. 2 is a side view showing, in a skeleton form, components of the nicking device according to the embodiment. [Figure 4B] FIG. 2 is a side view showing, in a skeleton form, components of the nicking device according to the embodiment. [Figure 5] FIG. 2 is a side view showing, in a skeleton form, components of the nicking device according to the embodiment. [Figure 6] 1A to 1C are diagrams illustrating a method of using a nicking device according to an embodiment. [Figure 7A] FIG. 10 is a plan view illustrating a nick formed in the punching blade. [Figure 7B] FIG. 10 is a side view illustrating a nick formed in the punching blade. [Figure 7C] FIG. 7C is a partially enlarged view of the dashed line portion in FIG. 7B. DETAILED DESCRIPTION OF THE INVENTION

[0014] Preferred embodiments of the present invention will now be described with reference to the drawings.

[0015] The nick forming device for a punching blade according to this embodiment is a device for manually forming nicks in a punching blade provided in a punching die. The configuration and method of use of this nick forming device will be described below.

[0016] (Configuration of the nicking device) 1 and 2 are a side view and a front view, respectively, showing the configuration of a nicking device according to this embodiment. Also, FIGS. 3A to 3C are a perspective view, a side view, and a plan view, respectively, showing the configuration of a movable part of the nicking device. Also, FIGS. 4A and 4B are side views showing the components of the nicking device in a skeletonized form, respectively, before and after a trigger is pulled. Furthermore, FIG. 5 is a side view showing the same components, superimposed with the states before and after the trigger is pulled.

[0017] For convenience, components such as the tension coil spring are omitted from Fig. 2. Also, for convenience, components such as the screw member and cutting portion are omitted from Figs. 4A, 4B, and 5. Also, in Fig. 5, the state before the trigger is pulled is shown by a dashed line, and the state after it is pulled is shown by a solid line. Also, in each drawing, the spring portion of the tension coil spring is shown as a rectangle for simplification.

[0018] All of the components of the nicking device described below are made of metal, although some or all of the components may be made of other materials, such as resin.

[0019] As shown in Figure 1, the nick forming device 1 is a pistol-shaped device that includes a housing 2, a grip portion 21, a trigger 3 which is an operating lever, a movable portion 4 that can move back and forth, and a blade portion 5 attached to the movable portion 4.

[0020] The housing 2 is composed of two plate-like members 2a and 2b of the same shape. The plate-like members 2a and 2b are fixed together with a plurality of set screws 22. The set screws 22 are composed of a male screw 22a and a female screw 22b, which fasten the plate-like members 2a and 2b together by sandwiching them from the outside. The plate-like members 2a and 2b are spaced a certain distance apart in the left-right direction, and at least some of the components such as the trigger 3 and the movable part 4 are housed in the space between the plate-like members 2a and 2b.

[0021] Of the set screws 22, the shaft portion 25 (see FIGS. 4A and 4B) of the set screw 221 attached slightly rearward from the center in the front-rear direction of the housing 2 functions as a rotation shaft for the trigger 3, as will be described later.

[0022] A set screw 23 having a smaller diameter than the set screw 22 is attached to the middle portion of the plate-like members 2a and 2b. As will be described later, a hook of the tension coil spring 8 is engaged with a shaft portion 26 of the set screw 23 (see FIGS. 4A and 4B).

[0023] The grip portion 21 corresponds to the rear portion of the housing 2, and protrudes downward to an extent that it can be held by the operator's hand. In this manner, in the present embodiment, the grip portion 21 is formed integrally with the housing 2, but the grip portion 21 and the housing 2 may be separate bodies.

[0024] The trigger 3 is made up of two plate-like members 3a and 3b, similar to the housing 2. The plate-like members 3a and 3b are fixed near their lower ends with set screws 31 consisting of male and female screws 31a and 31b. Furthermore, through holes are formed near the upper ends of the plate-like members 3a and 3b, and the shaft 25 of the set screw 221 is inserted into this through hole. This makes the trigger 3 rotatable around the shaft 25 as the rotation axis.

[0025] 4A, 4B, and 5, the trigger 3 and the striking part 6 connected to the trigger 3 are described in more detail. A connecting shaft 33 that connects the plate-like members 3a and 3b is provided near the upper end of the trigger 3, and a connecting shaft 34 that also connects the plate-like members 3a and 3b is provided slightly above the center in the vertical direction. The trigger 3 is connected to the striking part 6 via these connecting shafts 33 and 34.

[0026] The striking part 6 is disposed between the plate-like members 3a and 3b that constitute the trigger 3, and is shaped like a long, narrow plate extending in the front-rear direction, intersecting the trigger 3 that extends in the up-down direction. A tension coil spring (spring) 7 is interposed between the trigger 3 and the striking part 6. More specifically, a claw part 61 that extends upward is formed at the rear end of the striking part 6, and a hook at one end of the tension coil spring 7 is engaged with this claw part 61. The hook at the other end of the tension coil spring 7 is engaged with the connecting shaft 33 of the trigger 3 described above.

[0027] A rectangular first recess 62 recessed downward is provided slightly rearward from the center of the striking part 6 in the front-to-rear direction, and a semicircular second recess 63 recessed further downward than the first recess 62 is provided in front of the first recess 62. As shown in FIG. 4A, before the trigger 3 is pulled, the connecting shaft 34 of the trigger 3 is fitted into the second recess 63. Furthermore, as shown in FIG. 4B, after the trigger 3 is pulled, the connecting shaft 34 moves from the second recess 63 to the first recess 62.

[0028] When the trigger 3 is pulled, that is, when the trigger 3 is rotated clockwise in the figure against the restoring force of the tension coil spring 7, the connecting shaft 34 of the trigger 3 slides rearward along the inner circumferential surface of the second recess 63, and the connecting shaft 33 moves in a direction away from the claw 61 of the striking part 6. When the trigger 3 is rotated a certain amount, the connecting shaft 34 moves from the second recess 63 to the first recess 62 and slides rearward along the surface of the first recess 62 (see FIG. 5). At this time, the restoring force (biasing force) of the tension coil spring 7 acts, pulling the claw 61 of the striking part 6 forward. As a result, the striking part 6 moves forward, and its front end strikes the rear end of the movable part 4 with a certain force.

[0029] An oblong hole 64 is formed on the front side of the striking part 6, and the shank 27 (see FIGS. 4A and 4B) of the set screw 222 attached near the center of the housing 2 in the front-rear direction is inserted into this oblong hole 64. The shank 27 restricts the amount of forward movement of the striking part 6.

[0030] Next, we will explain the configuration of the movable part 4. As shown in Figures 3A to 3C, the movable part 4 has a movable part main body 42 and a tip part 41 provided on the front side of the movable part main body 42. The movable part main body 42 and the tip part 41 are both shaped like an elongated plate, and the tip part 41 is narrower in width than the movable part main body 42.

[0031] The tip portion 41 is composed of a first member 41a formed integrally with the movable portion main body 42, and a second member 41b provided on the first member 41a. The first member 41a and the second member 41b are fastened together with two screws 43, with the blade portion 5 sandwiched between them.

[0032] The blade portion 5 is configured as a blade that can deform the cutting edge of the punching blade. As will be described later, a nick is formed by deforming a part of the cutting edge of the punching blade with the blade portion 5.

[0033] As described above, the blade portion 5 is detachably attached to the tip portion 41 by screwing. Therefore, if the blade portion 5 becomes damaged, it can be easily replaced with a new blade portion 5, allowing the nick forming device 1 to be used for a long period of time. In the present embodiment, the blade portion 5 is attached outside the housing 2, making replacement even easier.

[0034] Two circular holes 44 and two oblong holes 45 are formed in the movable part main body 42, alternately aligned in a row from the front side. Set screws 47 (see FIG. 1) are attached to the circular holes 44. These set screws 47 are inserted into the oblong holes 24 formed in the plate-like members 2a and 2b of the housing 2. Furthermore, the shanks of the set screws 22 that secure the plate-like members 2a and 2b of the housing 2 are inserted into the oblong holes 45. The shanks restrict the amount of forward movement of the movable part 4.

[0035] An upwardly extending claw 46 is formed at the rear end of the movable part body 42, and a hook at one end of the tension coil spring 8 is engaged with this claw 46. On the other hand, the hook at the other end of the tension coil spring 8 is engaged with the shank 26 of the set screw 23 described above. The tension coil spring 8 urges the movable part 4 rearward.

[0036] When the rear end of the movable part 4 is struck by the striking part 6 as described above, the movable part 4 moves forward against the biasing force of the tension coil spring 8, and is then returned rearward by that biasing force.

[0037] (How to use the nicking device) Next, we will explain how to use the nick forming device 1 configured as above. Here, we will explain how to use it when forming nicks in the punching blade of a punching die after the punching die has been manufactured. However, the nick forming device 1 can also be used in the same way when forming nicks in the punching blade before the punching die is manufactured.

[0038] FIG. 6 is a diagram illustrating how to use the nick forming device 1. In FIG. 6, the configuration of the punching die 110 is shown in cross section. As shown in this figure, the punching die 110 has a base 111. The surface of the base 111 is flat, and a groove (not shown) of the shape to be punched is formed on this surface by laser processing, and a punching blade 112 formed by bending a strip-shaped blade into a ring is fitted into this groove. The end of the punching blade 112 opposite the cutting edge is fitted into the groove of the base 111 so that the cutting edge is positioned on the front side.

[0039] Elastic members 113a and 113b attached to the base 111 are provided on the outer and inner peripheries of the punching blade 112, respectively. The elastic members 113a and 113b are made of urethane sponge. These elastic members 113a and 113b are used to prevent the sheet material to be processed from adhering to the punching blade 112 during punching and becoming difficult to separate.

[0040] A through-hole 114 of a predetermined shape is provided in the center of the base 111. This through-hole 114 becomes a space for accommodating the bottom portion of the product punched out from the sheet material when the sheet material is cut.

[0041] When forming a nick in the punching blade 112 of the punching die 110 configured as described above, the worker holds the grip portion 21 of the nick forming device 1 with his / her hand, places his / her finger on the trigger 3, and then presses the blade portion 5 from above the elastic members 113a and 113b, bringing the blade portion 5 into contact with the cutting edge of the punching blade 112 (see FIG. 6). At this time, it is desirable that the blade portion 5 and the cutting edge of the punching blade 112 are positioned so as to intersect at a substantially right angle.

[0042] Next, the operator pulls the trigger 3 with the blade portion 5 abutting against the cutting edge of the punching blade 112 as described above. This causes the trigger 3 to rotate against the restoring force of the tension coil spring 7, and when the amount of rotation exceeds a predetermined value, the striking portion 6 moves forward due to the restoring force of the tension coil spring 7 as described above, and the front end of the striking portion 6 strikes the rear end of the movable portion 4 with a certain force. Upon receiving this strike, the movable portion 4 moves forward against the biasing force of the tension coil spring 8. At this time, the cutting edge of the punching blade 112 is deformed by the blade portion 5, which moves forward together with the movable portion 4, and a nick is formed.

[0043] After nicks are formed as described above, when trigger 3 is returned to its original position, the components of nick forming device 1 return to the state shown in Fig. 4A (the state shown by the dashed lines in Fig. 5). Therefore, by repeating the above operation, that is, bringing blade portion 5 into contact with the cutting edge of punching blade 112, pulling trigger 3, and returning trigger 3, the operator can easily form multiple nicks in punching blade 112.

[0044] 7A and 7B are plan and side views, respectively, illustrating nicks formed in the punching blade 112 by the nick forming device 1 as described above, and FIG. 7C is a partially enlarged view of the dashed line portion in FIG. 7B. As shown in these figures, the cutting edge 112a of the punching blade 112 is tapered on both sides and tapered toward the tip. The punching blade 112 has the cutting edge 112a tapered on both sides and a plate-like portion 112b with a substantially uniform thickness. Reference numeral 112c denotes the ridge between the cutting edge 112a and the plate-like portion 112b. Thus, although a double-edged punching blade is illustrated here as the punching blade 112, a single-edged punching blade may also be used.

[0045] The nicks 201 are formed at the cutting edge 112a of the punching blade 112. However, the nicks 201 may extend to the plate-shaped portion 112b. According to the nick forming device 1 of this embodiment, any operator can form nicks 201 with approximately the same width w and depth d.

[0046] The width w of the nicks 201 can be controlled by the thickness of the blade portion 5 included in the nick-forming device 1. The desired width w can be obtained by appropriately using blade portions 5 of different thicknesses. The depth d of the nicks 201 can be controlled by the restoring force of the tension coil spring 7, the distance between the blade portion 5 and the cutting edge of the punching blade 112 when forming the nicks 201, the positional relationship between the oval hole 45 in the movable part 4 and the shank of the set screw 22 inserted into the oval hole 45, or the like.

[0047] As described above, the striking unit 6 strikes the movable unit 4 with a constant force, so the nicks formed by the blade unit 5 attached to this movable unit 4 are always of approximately the same size. In this way, with the nick forming device 1 of this embodiment, nicks of a uniform size can be formed regardless of the operator.

[0048] (Other embodiments) In the above embodiment, the striking portion 6 strikes the movable portion 4 by the action of the tension coil spring 7, but this is not limiting and other configurations can be adopted as long as the striking portion 6 can strike the movable portion 4 with a constant force. For example, a configuration using a spring other than a tension coil spring may also be used.

[0049] Furthermore, in the above embodiment, the nicking device 1 is a pistol type, but this is not limiting and the nicking device 1 may have other shapes.

[0050] Furthermore, in the above embodiment, the trigger 3 is pulled with the blade portion 5 of the nick forming device 1 in contact with the cutting edge of the punching blade 112, but this is not limited to this. Since uniform nicks can be formed as long as the blade portion 5 is held at a constant distance from the cutting edge of the punching blade 112, the blade portion 5 does not have to be in contact with the cutting edge. For example, a holder for maintaining a constant distance between the blade portion 5 and the cutting edge may be used, and the trigger 3 may be pulled while maintaining that distance. Note that, as in the above embodiment, the state in which the blade portion 5 is in contact with the cutting edge of the punching blade 112 corresponds to a state in which the distance between the blade portion 5 and the cutting edge is held at zero, and therefore is included in the state in which the blade portion 5 is held at a constant distance from the cutting edge of the punching blade 112. [Industrial Applicability]

[0051] The punch blade nick forming device of the present invention is useful as a device for forming nicks in punch blades used in various punching dies. [Explanation of symbols]

[0052] 1 Nick forming device 2. Case 2a, 2b Plate-shaped members 21 Grip section 22,23 Set screws 22a male thread 22b female thread 24 oval holes 25, 26, 27 Shaft 3. Trigger 3a,3b Plate member 31 Set screws 31a male thread 31b female thread 33,34 Connecting shaft 4 Moving parts 41 Tip 41a First member 41b Second member 42 Movable body 43 Screw 44 circular holes 45 oval hole 46 Claw 47 Set screws 5 Blade part 6. Striking section 61 Claw 62 First recess 63 Second recess 64 oval hole 7,8 Extension coil spring 110 punching die 111 Foundation 112 Punching blade 113a, 113b Elastic member 13a, 13b Elastic member 114 Through hole

Claims

1. A nick forming device for forming nicks in a punching blade provided in a punching die, a movable part having a blade part capable of deforming the cutting edge of the punching blade and movable in one direction together with the blade part; a striking part that strikes the movable part to move it in the one direction; Equipped with With the blade portion held at a fixed distance from the cutting edge of the punching blade, the striking portion strikes the movable portion with a fixed force, and the blade portion moves together with the movable portion toward the punching blade, deforming a part of the cutting edge of the punching blade and forming a nick in the punching blade. Nick forming device for punching blade.

2. An operating lever that controls the impact of the impact unit and can be operated by the fingers of a hand Furthermore, When the operating lever is operated by a certain amount while the blade portion is held at a certain distance from the cutting edge of the punching blade, the striking portion strikes the movable portion with a certain force. The nick forming device for a punching blade according to claim 1 .

3. The striking portion has a spring connected to the operating lever, and when the operating lever is operated by a certain amount against the spring, the striking portion strikes the movable portion by the biasing force of the spring. The nick forming device for a punching blade according to claim 2.

4. the nicking device is a pistol-type; The operating lever is a trigger that can be rotated by a finger, The striking portion strikes the movable portion when the operating lever is rotated by a certain amount. The nick forming device for a punching blade according to claim 2 or 3.

5. The blade portion is detachably attached to the tip portion of the movable portion. The nick forming device for a punching blade according to any one of claims 1 to 3.

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