JPH07108412B2 - Knife bending machine - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a long thin sheet-like knife for punching a sheet of paper, plastic, corrugated cardboard or the like into a predetermined shape by punching press working or for making a crease ( The present invention relates to a bending device for bending a knife) into a predetermined shape.

[0002]

BACKGROUND OF THE INVENTION For example, as shown in FIG. 13, a knife A of this type has a thin wall (for example, a wall thickness of 0.4 to 1.0 mm),
It is strip-shaped, has a cutting edge 1, and has a substantially rectangular cross section. The knife A is a knife fitting groove 3 formed on a wooden (resin, metal, etc.) knife holder 2.
Used by being fixed in place. The knife fitting groove 3 is
For example, it is formed in advance into a predetermined shape (shape corresponding to the cutting die) by laser processing. Such a knife fitting groove 3
The knife to be fitted in is precisely bent according to the shape of the fitting groove 3. The above knife A for bending
Is placed with one end side along its longitudinal direction, for example, the back portion 6 side being along a surface plate (not shown), and is bent by pressing it from one side of the knife A with a bending die. The bent portion 5 is formed.

[0003]

However, since the knife is formed by cold rolling, the arrow B in FIG.
The end face shape is slightly curved as shown in. Therefore, when bending is performed as indicated by arrows X and Y, the bending stress when bending in the direction of arrow X is different from that when bending in the direction of arrow Y, and pressing with the same force always results in the desired bending radius. Can't get Further, in the conventional apparatus for bending the knife A as described above, when the bending die is pressed from one side surface of the knife A, the feeding roller R1 grips the knife A by the action at that time. , R2
There was a problem that it could not be bent at the correct position because it was pulled out from the machine. Therefore, the present invention is
The present invention has been made in view of the above circumstances, and corrects the warp of a portion where bending is performed to obtain a desired bending radius regardless of the bending direction, and accurately grasps the knife to bend the knife with bending force. It is an object of the present invention to provide a bending apparatus capable of preventing dragging out of the material.

[0004]

In order to achieve the above-mentioned object, the main means adopted by the present invention is the gist thereof, but in the apparatus for bending by pressing a bending die against a thin plate knife, A nipping mechanism for nipping and fixing the knife in such a manner that one side of the knife along the longitudinal direction is along the upper surface of the surface plate and nipping the both sides by a pair of nipping members that maintain flatness, and the above nipping. And a bending mechanism which is disposed adjacent to the mechanism and is driven in conjunction with the repetitive operation of pinching and opening of the pinching mechanism, and which repeatedly applies bending force to the knife clamped by the pinching mechanism. It is a device for bending a knife according to a point.

[0005]

In the bending apparatus having the above-described structure, when the knife is bent by the bending mechanism, the knife is clamped from both sides of the knife by the clamping mechanism in a state of flatness, so that the knife is fixed. The same bending radius can be obtained with the same force whether it is bent to the right or left. Further, the holding mechanism prevents the knife from being pulled out by the pulling force generated during bending.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments embodying the present invention will be described below with reference to the accompanying drawings for the understanding of the present invention. The following embodiments are examples of embodying the present invention and are not intended to limit the technical scope of the present invention. 1 is a side view of a bending apparatus according to an embodiment of the present invention, FIG. 2 is a plan view of the bending apparatus, FIG. 3 is a front view of the bending apparatus, and FIG. 4 is the bending apparatus. FIG. 3A is a perspective view of the knife for forming the knife, FIG. 7A is a perspective view, FIG. 7B is a front view, FIG. 7C is a plan view, FIG. 5 is an enlarged cross-sectional view of the main part of FIG. 5, showing a base for holding the processing die,
(A) is a front view, (B) is a plan view, FIG. 6 is a side view of a delivery mechanism of a knife which constitutes the bending apparatus, FIG. 7 is a plan view of the delivery mechanism, and FIG. 8 is a main part in FIG. 9 is an enlarged view of a state in which a part thereof is broken, FIG. 9 is a front view of a holding mechanism of a knife which constitutes the bending apparatus, FIG. 10 is a component diagram of the holding mechanism, and FIG. 11 is a knife by the bending apparatus. FIG. 12 is a graph showing an example of the operation of the processing die when bending is applied to the blade, and FIG. 12 is a plan view of the knife bent by the bending apparatus. As shown in FIGS. 1 to 3, the bending apparatus according to this embodiment is such that the back portion 6 (one end side along the longitudinal direction) of the knife A is set along the upper surface of the surface plate 7 to form a set of both side surfaces thereof. A holding mechanism 8 for releasably holding and fixing the knife A by means of holding members 8a, 8b (see FIG. 9), and a biasing mechanism 9 for biasing the knife A toward the upper surface of the surface plate 7. , Is disposed adjacent to the holding mechanism 8 with a predetermined gap, and is driven in conjunction with the holding operation of the holding mechanism 8 to repeatedly apply bending force to the knife A held by the holding mechanism 8. Bending mechanism 10
And a claw mechanism 12 for gripping the knife A from both sides thereof
(FIG. 2), and a contact piece 47 (see FIG. 6) that is provided in the claw mechanism 12 so as to be retractable and retractable, and that abuts on the rear end portion a of the relatively short knife A held by the claw mechanism 12 in the traveling direction. , Fig. 8
And a feeding mechanism for feeding the knife A by pushing the pawl mechanism 12 little by little.

In the holding mechanism 8, as shown in FIGS. 9 and 10, the holding member 8a is located inside the block 14 having the holding member 8b and faces the holding member 8b in the directions of arrows 28a and 28b. It is slidably fitted in the holding member 8a, and a long hole 8c is formed in the holding member 8a in the vertical direction. Guide pins 15, 1 are provided in the elongated holes 8c.
5 is slidably fitted, and the guide pins 15, 1
A clamp bar 16 for supporting 5 is provided inside the block 14 slidably in the directions of arrows 22a and 22b along the tapered surface 14a formed on the block 14.
In this case, guide plates 17, 17 (see FIG. 1) for holding the clamp bar 16 are attached to the front side and the rear side of the block 14 with the clamp bar 16 interposed therebetween. A shaft 18 planted at the lower end of the clamp bar 16 is loosely fitted in an elongated hole 19a formed in a hinge 19, and the lower portion of the shaft 18 sandwiching the shaft 18 has a spring 26
Is elastically biased in the direction of arrow 28a. Therefore,
The upper portion of the clamp bar 16 about the shaft 18 is biased in the direction of the arrow 28b, so that the clamp bar 16 is always in sliding contact with the tapered surface 14a of the block 14. One end of the hinge 19 is rotatably supported by a fulcrum pin 29, and the other end is swingably driven by a cylinder 30 in the vertical direction. The holding mechanism 8 having the above structure is driven in conjunction with the bending mechanism 10. That is, when the knife A is bent, the clamp bar 16 is slid in the arrow 22a direction by driving the cylinder 30 downward. As a result, the sandwiching member 8a is slidably driven in the direction of the arrow 28a by being guided by the tapered surface 14a, and both sides of the knife A are firmly sandwiched and fixed by the sandwiching member 8a and the sandwiching member 8b of the block 14. To be done. The sandwiching members 8a and 8b form a highly accurate flat surface in which the sandwiching surfaces closely contact each other so as to correct the warp of the sandwiched knife A. However, some unevenness may be formed to increase the frictional force with the knife A. As a result, since the "warpage" of the bent portion of the knife A is corrected and the flatness is maintained at a high level, the same bending radius can be obtained with the same force even when bending in either the left or right direction, and the processing accuracy is improved. improves. Further, as will be described later, the clamping mechanism can sufficiently oppose the pulling force generated in the knife when the bending die is pressed against the knife to perform bending, and there is no problem that the knife is pulled out. . Bending mechanism 10 described later
After the bending process is completed, the cylinder 30 is driven upward, and the clamp bar 16 moves in the direction of arrow 22.
It is driven to slide in the b direction. As a result, the holding member 8a
Is driven to slide in the direction of the arrow 28b, and the holding members 8a and 8b
The holding of knife A by means of is released. It should be noted that the hole 14b, which is almost the central portion of the block 14 and penetrates from the rear surface side to the front surface side, allows the tip portion of the claw mechanism 12 to be inserted up to the vicinity of the bending mechanism 10. It is provided below. Also, the biasing mechanism 9
As shown in FIG. 1, the pressing roller 31 is provided so as to face the upper surface of the surface plate 7 and has a pressing roller 31 for pressing the knife A toward the upper surface of the surface plate 7.

The pressing roller 31 is endlessly engraved with a support groove 31a for inserting the cutting edge 1 of the knife A into the pressing roller 31 and supporting the tapered surface of the surplus portion thereof. Is driven to move. That is, the pressing roller 31 is driven to move downward by the cylinder 32, so that the knife A is pressed against and held by the upper surface of the surface plate 7. The bending mechanism 10 (FIGS. 2 and 3) is configured to include the processing die 24 (see FIG. 4) that acts on the side portion of the knife A to bend the knife A. The processing die 24 is integrally formed of a thin plate member, and the substantially central portion thereof is
A hollow groove 24b having edge portions 24a which are parallel to both side surfaces of the knife A when the knife A is penetrated through an appropriate gap is integrally formed by, for example, wire cutting. Then, the edge portion 24a is hardened. In this case, the above-mentioned appropriate gap means an operation for bringing the edge portion 24a into contact with only one side portion of the knife A when the processing die 24 is vibrated as described later. This is an acceptable size. An arcuate peripheral surface 24c having a radius of curvature R is engraved on the front side of the processing die 24 in order to facilitate passage of the bent knife A. The processing die 24 configured as described above is detachably fitted into a base 25 (see FIG. 5) corresponding to a holder, and is held by screws at its upper and lower positions. As shown in FIG. 3, the base 25 has a slide bearing 33 at the lower end thereof in the feeding direction of the knife A (arrow 27 direction,
A direction (arrow 28) perpendicular to the direction perpendicular to the paper surface of FIG.
It is linearly slidably supported in the directions a and 28b). The base 25, together with the processing die 24, is connected to the control device 3 via the crank 34.
A motor 35 controlled by 9 vibrates in the bending direction of the knife A. In this case, in order to prevent the processing die 24 from falling (the upper portion of the processing die 24 in the direction of the arrow 27) from collapsing with respect to the upper surface of the surface plate 7 and to secure a squareness, the upper portion of the base 25 is substantially omitted. The L-shaped support member 36 is slidably supported in the left-right direction by the L-shaped tip portion thereof.

The processing die 2 having the above structure
In FIG. 4, since the hollow groove 24b is integrally formed as described above, the parallelism of the edge portion 24a with respect to the side portion of the knife A is ensured, and the knife A is accurately bent without causing a problem such as a warp. Bending can be performed while ensuring a right squareness. In addition, the processing die 24
Since it is formed thin as described above, the knife A
However, it is possible to perform bending with a relatively small radius of curvature. Further, as shown in FIG. 11, the machining die 24 is controlled by a control device 39 so as to stagnate for a predetermined pressing time (stagnation time) T ₁ at an operating position with respect to the knife A.
Since the amount of spring back in the knife A is dramatically reduced as compared with the case where there is no stagnation, extremely efficient bending can be achieved. In this case, as the stagnation time T ₁ , for example, when the material of the knife A is a general blade material and the wall thickness is 0.7 to 1.0 mm,
A value of about 0.3 to 0.4 seconds is suitable. Further, in the bending apparatus, the control device 39 controls the bending operation amount (stroke amount during vibration) with respect to the knife A during the vibration operation of the processing die 24 and the delivery mechanism (not shown).
It also has a control function of changing the feeding amount of the knife A by, for example, each time bending is performed.
Therefore, in the apparatus, the knife A can be processed into various shapes such as a bellows shape, an arc shape, and a spiral shape (see FIG. 12).

An example of the control will be shown below. For example, the delivery amount of the knife A by the delivery mechanism 11 is 0.3 to 2
When the knife A is bent to have a curvature radius of 5 mm, for example, when the knife A is bent, the feed amount of the knife A by the feed mechanism is 3 to 5 times at a pitch of 0.5 mm for each bending. When the processing die 24 is operated with a constant bending operation amount while being separately sent out, the knife A can be accurately and easily bent into a small-diameter circular arc shape. Further, in this case, the knife A is formed in a spiral shape in plan view by sequentially increasing the feed amount by the knife pushing mechanism. At the same time, the bending operation amount of the processing die 24 may be sequentially changed. Further, when the knife A is bent at 90 ° in a plan view, the knife A is bent at 45 ° by the processing die 24 in one bending operation. After that, the knife A is fed by, for example, 0.5 mm by the knife pushing mechanism, and further 4 by the processing die 24.
By bending at 5 °, it is almost 90
Bending of ° is performed. In the base 25 according to this embodiment, as shown in FIG. 5, the degree of tilting of the processing die 24 in the left-right direction (arrow 28a with respect to the upper surface of the surface plate 7) is provided above the holding position of the processing die 24. , Screws 37, 38 for finely adjusting the inclination angle in the 28b direction) are screwed. By appropriately adjusting the screws 37 and 38 and inclining the processing die 24 with respect to the surface plate 7, and bending the knife A in this state, the knife A is directed toward the upper surface of the surface plate 7. The component force in the pushing direction acts. As a result, the bending process can be performed under a state where the back portion 6 of the knife A is always along the upper surface of the surface plate 7. The normal long (for example, 30 cm) knife A is fed out by grasping the knife A by the claw mechanism 12 described later and feeding it out, and the knife tip is brought into contact with a predetermined contact portion to perform positioning. The pawl mechanism 12 is provided with an abutting piece 47 for pressing and positioning the rear end of the short knife A (see FIGS. 2, 6, 7 and 8). That is, in the pawl mechanism 12, a pair of pawl members 40 facing the upper surface of the base 41 are provided.
a and 40b are provided, and the claw members 40a and 40b are provided.
Are rotatably supported by shafts 42, 42. The claw members 40a, 40b are always elastically biased in the opening direction by a spring 43, and a tapered boss 44 disposed slidably inward of the rear end portion of the claw member 40 with respect to the rear end portion of the cylinder 45. Driven to move in and out, the claw members 40a, 4a
0b is opened and closed. When the claw members 40a and 40b are driven in the closing direction by the cylinder 45,
The knife A is clamped from both sides thereof by the action of the anti-slip grooves 46, 46 formed on the facing surfaces of the claw members 40a, 40b. A contact piece 47 is provided inside the claw member 40b, and the contact piece 47 is a pin 48.
Is rotatably supported by the claw member 40b. The contact piece 47 is elastically biased by a leaf spring 49 in a direction in which it always projects. The base 41 is slidably supported by a slide bearing 50 in an arrow 27 direction and its opposite direction, and a ball screw member (not shown) is controlled by a stepping motor 51 which is controlled in conjunction with the motor 35.
It is slidably driven via. The feed amount of the base 41 by the stepping motor 51 in this case can be appropriately changed as described above.

For example, a relatively long knife such as a normal scale is
The feeding mechanism 11 is provided so as to be supplied from the rear or from above and pass between the claw members 40a and 40b toward the front. In this case, the slope 47a of the contact piece 47 is pushed in the direction of the arrow 27 by the tip of the elongated knife, so that the contact piece 47 escapes into the inside of the claw member 40b. This allows the knife to pass through. When handling a long knife as described above, the stepping motor 51 is held with the base 41 holding the knife between the claw members 40a and 40b.
Is driven in the direction of the arrow 27 by. And knife A
The position of the knife is determined by the tip of the blade contacting a predetermined contact portion. On the other hand, in the case where the knife A is a short knife that cannot hit the predetermined contact portion, the tip cannot be positioned by contacting the contact portion like a long knife, so the claw mechanism 12 The contact mechanism 47 is fed to a predetermined position by the feeding mechanism 11 while keeping the open position. During this time, the contact piece 47 contacts the rear end of the short knife, so that the short knife is positioned at the calculated predetermined position. In this embodiment, the knife A is strongly clamped by using the tapered surfaces 14a and 14b, but as the clamping mechanism, other than the above, hydraulic pressure, a booster, and various other mechanisms can be used.

[0012]

Since the present invention is constructed as described above, the knife can be machined so that the bending radius is accurate with respect to the back of the knife.

[Brief description of drawings]

FIG. 1 is a side view of a bending apparatus according to an embodiment of the present invention.

FIG. 2 is a plan view of the bending apparatus.

FIG. 3 is a front view of the bending apparatus.

4A and 4B are views showing a processing die of a knife that constitutes the bending apparatus, wherein FIG. 4A is a perspective view, FIG. 4B is a front view, FIG. 4C is a plan view, and FIG. , (E) are enlarged cross-sectional views of main parts in (C).

5A and 5B are views showing a base for holding the processing die, in which FIG. 5A is a front view and FIG. 5B is a plan view.

FIG. 6 is a side view of a knife feeding mechanism that constitutes the bending apparatus.

FIG. 7 is a plan view of the delivery mechanism.

FIG. 8 is an enlarged view of the main part of FIG. 7 with a part thereof broken away.

FIG. 9 is a front view of a knife holding mechanism that constitutes the bending apparatus.

FIG. 10 is a view of components of the holding mechanism.

FIG. 11 is a graph showing an example of the operation of the processing die when the knife is bent by the bending apparatus.

FIG. 12 is a plan view of a knife bent by the bending device.

FIG. 13 is a perspective view for explaining the background art of the present invention and showing a state before a knife is attached to the knife holder.

FIG. 14 is a perspective view illustrating a warped state and a bent state of the knife for explaining the background art of the present invention.

[Explanation of Codes] 6 ... Back part 7 ... Surface plate 8 ... Clamping mechanism 8a, 8b ... Clamping member 10 ... Bending mechanism 11 ... Sending mechanism 12 ... Claw mechanism 13 ... Reverse return preventing mechanism 24 ... Machining die 39 ... Control device 40a, 40b ... Claw member 47 ... Stopper A ... Knife a ... Rear end

Claims (1)

[Claims] 1. A bending die is pressed against a thin plate knife.
In a device for bending the knife, one end side of the knife along the longitudinal direction is placed along the upper surface of the surface plate, and the both side surfaces of the knife are openly held by a pair of holding members for keeping flatness. And a clamping mechanism that is fixed adjacent to the clamping mechanism, is driven adjacent to the clamping mechanism, and is driven in conjunction with repeated operations of clamping and opening of the clamping mechanism, and repeatedly bends the knife clamped by the clamping mechanism. A bending device for a knife, comprising: a bending mechanism for giving.