JP7792141B2 - Nick forming device for punching blade - Google Patents

Description

The present invention relates to a nick forming device that forms nicks in a punching blade used in a punching die.

When punching a sheet with a punching die, if the product portion and unnecessary portion of the sheet easily separate after punching, problems such as the need to stop the machine can arise. For this reason, nicks are sometimes formed in the punching blade to temporarily connect the product portion and unnecessary portion. Nicks are formed by deforming part of the cutting edge of the punching blade so that it no longer functions as a blade. Specifically, nicks are formed by cutting or grinding off part of the cutting edge. Bending or crushing part of the cutting edge can also result in the formation of a nick, as this can cause that part to no longer function as a blade. This nick keeps the product portion and unnecessary portion partially connected, preventing them from easily separating.

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 specialized equipment such as a grinder. Patent Document 1 discloses a nick-making machine, which is an example of such specialized equipment. In contrast, in the latter case, since it is difficult to use a grinder or the like, nicks are often formed manually using simple tools. 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.

Japanese Patent Application Laid-Open No. 2006-26877

As mentioned above, when nicks are formed manually using simple tools, problems arise, such as variations in the width and depth of nicks depending on the worker, and even the same worker may form nicks of different sizes each time due to differences in the amount of force applied. This results in problems such as a loss of aesthetic appeal for the product.

The present invention was made in light of these circumstances, and its main purpose is to provide a punch blade nick forming device that can solve the above problems.

In order to solve the above-mentioned problems, one aspect of the present invention is a nick forming device for a punching blade that forms nicks in a punching blade provided in a punching die. The device has a blade portion that can deform the cutting edge of the punching blade and is equipped with a movable portion that can move in one direction together with the blade portion, and a striking portion that strikes the movable portion to move it in the one direction. While holding the blade portion at a fixed distance from the cutting edge of the punching blade, the striking portion strikes the movable portion with a fixed force, and as a result, the blade portion moves together with the movable portion toward the punching blade, deforming a portion of the cutting edge of the punching blade and forming a nick in the punching blade.

In this aspect, the device may further include an operating lever that controls the impact of the impact unit and can be operated by a finger, 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 strikes the movable unit with a certain force.

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 biasing force of the spring when the operating lever is operated a certain amount against the spring.

In the above aspect, the nicking device may be pistol-shaped, the operating lever may be a trigger that can be rotated by a finger, and the striking portion may be configured to strike the movable portion when the operating lever is rotated a certain amount.

In the above aspect, the blade portion may be detachably attached to the tip of the movable portion.

The punch blade nick forming device of the present invention makes it easy to form nicks of uniform size.

FIG. 2 is a side view showing the configuration of a nick forming device according to an embodiment. FIG. 1 is a front view showing the configuration of a nick forming device according to an embodiment. FIG. FIG. FIG. FIG. 2 is a side view showing, in a skeleton form, components of the nicking device according to the embodiment. FIG. 2 is a side view showing, in a skeleton form, components of the nicking device according to the embodiment. FIG. 2 is a side view showing, in a skeleton form, components of the nicking device according to the embodiment. 1A to 1C are diagrams illustrating a method of using a nicking device according to an embodiment. FIG. 10 is a plan view illustrating a nick formed in the punching blade. FIG. 10 is a side view illustrating a nick formed in the punching blade. FIG. 7C is a partially enlarged view of the dashed line portion of FIG. 7B.

A preferred embodiment of the present invention will be described below with reference to the drawings.

The punching blade nick forming device of this embodiment is a device for manually forming nicks in a punching blade provided on a punching die. The configuration and method of use of this nick forming device are described below.

(Configuration of the nicking device)
Figures 1 and 2 are a side view and a front view, respectively, showing the configuration of a nicking device according to this embodiment. Figures 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. Figures 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. Figure 5 is a side view showing the same components, superimposed with the states before and after the trigger is pulled.

In Figure 2, components such as the tension coil spring are omitted for convenience. Also, in Figures 4A, 4B, and 5, components such as the screw member and blade portion are omitted for convenience. Also, in Figure 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 figure, the spring portion of the tension coil spring is shown as a rectangle for simplicity.

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

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 that serves as an operating lever, a movable portion 4 that can move back and forth, and a blade portion 5 that is attached to the movable portion 4.

The housing 2 is composed of two identically shaped plate-like members 2a and 2b. The plate-like members 2a and 2b are fixed together with multiple set screws 22. The set screws 22 are composed of male and female threads 22a and 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.

Of the set screws 22, the shaft portion 25 (see Figures 4A and 4B) of the set screw 221, which is attached slightly rearward from the center of the housing 2 in the front-to-rear direction, functions as the pivot axis of the trigger 3, as described below.

A set screw 23 with 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, the hook of the tension coil spring 8 is engaged with the shank 26 of the set screw 23 (see Figures 4A and 4B).

The grip portion 21 corresponds to the rear portion of the housing 2 and protrudes downward enough to be grasped by the operator's hand. In this embodiment, the grip portion 21 is formed integrally with the housing 2, but the grip portion 21 and the housing 2 may also be separate entities.

Like the housing 2, the trigger 3 is composed of two plate-like members 3a and 3b. The plate-like members 3a and 3b are fixed near their lower ends with set screws 31 consisting of male and female threads 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 these through holes. This allows the trigger 3 to rotate around the shaft 25 as the rotation axis.

The detailed structure of the trigger 3 and the striking part 6 connected to the trigger 3 will be explained with reference to Figures 4A, 4B, and 5. 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.

The striking part 6 is disposed between the plate-like members 3a and 3b that make up the trigger 3. It is a long, narrow plate extending in the front-to-rear direction, and is positioned so as to intersect with the trigger 3, which extends in the up-down direction. A tension coil spring 7 is interposed between the trigger 3 and the striking part 6. Explaining in more detail, a claw 61 extending 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 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.

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 Figure 4A, before the trigger 3 is pulled, the connecting shaft 34 of the trigger 3 fits into the second recess 63. Furthermore, as shown in Figure 4B, after the trigger 3 is pulled, the connecting shaft 34 moves from the second recess 63 to the first recess 62.

When the trigger 3 is pulled, that is, when the trigger 3 is rotated clockwise against the restoring force of the tension coil spring 7, the connecting shaft 34 of the trigger 3 slides rearward along the inner surface of the second recess 63, and the connecting shaft 33 moves 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 Figure 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. This causes the striking part 6 to move forward, and its front end strikes the rear end of the movable part 4 with a certain force.

An oval hole 64 is formed on the front side of the striking part 6, and the shank 27 (see Figures 4A and 4B) of the set screw 222 attached near the center of the housing 2 in the front-to-rear direction is inserted into this oval hole 64. This shank 27 limits the amount of forward movement of the striking part 6.

Next, the configuration of the movable part 4 will be described. 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. Both the movable part main body 42 and the tip part 41 are shaped like long, thin plates, with the tip part 41 being narrower in width than the movable part main body 42.

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

The blade portion 5 is configured with a blade that can deform the cutting edge of the punching blade. As described below, a nick is formed by deforming part of the cutting edge of the punching blade using this blade portion 5.

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 this embodiment, the blade portion 5 is attached outside the housing 2, making replacement even easier.

The movable part main body 42 has two circular holes 44 and two oval holes 45 formed in a row, alternating from the front. Set screws 47 (see Figure 1) are attached to the circular holes 44. These set screws 47 are inserted into the oval holes 24 formed in the plate-like members 2a and 2b of the housing 2. The shanks of the set screws 22 that secure the plate-like members 2a and 2b of the housing 2 are inserted into the oval holes 45. The shanks restrict the amount of forward movement of the movable part 4.

A claw 46 extending upward 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. Meanwhile, the hook at the other end of the tension coil spring 8 is engaged with the shaft 26 of the set screw 23 mentioned above. The tension coil spring 8 biases the movable part 4 rearward.

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 to the rear by that biasing force.

(Method of using the nicking device)
Next, a method for using the nick forming device 1 configured as described above will be described. Here, a method for forming nicks in the punching blade of a punching die after the punching die is manufactured will be described. However, the nick forming device 1 can also be used in a similar manner when forming nicks in the punching blade before the punching die is manufactured.

Figure 6 is a diagram illustrating how to use the nick forming device 1. In Figure 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. 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.

Elastic members 113a and 113b attached to the base 111 are provided on the outer and inner sides 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, making it difficult to separate.

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

When forming a nick in the punching blade 112 of the punching die 110 configured as described above, the operator grasps the grip portion 21 of the nick forming device 1 with their hand, places their finger on the trigger 3, and then presses the blade portion 5 over the elastic members 113a and 113b, bringing the blade portion 5 into contact with the cutting edge of the punching blade 112 (see Figure 6). At this time, it is desirable to position the blade portion 5 so that it intersects with the cutting edge of the punching blade 112 at approximately a right angle.

Next, the operator pulls the trigger 3 with the blade portion 5 abutting 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. 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 constant 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, forming a nick.

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

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

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

The width w of the nick 201 can be controlled by the thickness of the blade portion 5 provided 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 nick 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 nick 201, or the positional relationship between the oval hole 45 in the movable part 4 and the shank of the set screw 22 inserted into that oval hole 45, etc.

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 a uniform 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.

(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.

In addition, in the above embodiment, the nick forming device 1 is pistol-shaped, but this is not limited to this and the nick forming device 1 may have other shapes.

In addition, 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 may be used to maintain a constant distance between the blade portion 5 and the cutting edge, 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 falls under the category of a state in which the blade portion 5 is held at a constant distance from the cutting edge of the punching blade 112.

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.

REFERENCE SIGNS LIST 1 Nick forming device 2 Housing 2a, 2b Plate-shaped member 21 Grip portion 22, 23 Set screw 22a Male screw 22b Female screw 24 Oval hole 25, 26, 27 Shaft portion 3 Trigger 3a, 3b Plate-shaped member 31 Set screw 31a Male screw 31b Female screw 33, 34 Connecting shaft 4 Movable portion 41 Tip portion 41a First member 41b Second member 42 Movable portion main body 43 Screw 44 Circular hole 45 Oval hole 46 Claw portion 47 Set screw 5 Blade portion 6 Striking portion 61 Claw portion 62 First recess 63 Second recess 64 Oval hole 7, 8 Tension coil spring 110 Punching die 111 Base 112 Punching blade 113a, 113b Elastic members 13a, 13b Elastic members 114 Through hole

Claims (5)

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 unit that strikes the movable unit to move it in the one direction,
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. an operating lever that controls the impact of the impact unit and can be operated by a finger of a hand;
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 . 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. 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. 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.