JPH06238337A - Device for bending knife - Google Patents

Abstract

PURPOSE:To bend a knife for punching a sheet into a prescribed shape by sending forth an abutting piece by a previously calculated amount. CONSTITUTION:This is a device for bending the knife for punching the sheet used when a pattern having a prescribed shape is punched on the sheet, etc., into a prescribed shape and the short knife A is mounted on a surface plate, pressed by the abutting piece 47 constituting a delivery mechanism and delivered in the direction of an arrow 27. Since a controller side already knows the dimension of the short knife A, the abutting piece is sent forth in advance by a prescribed amount. In this way, the short knife A can be sent to the prescribed bending position and the knife can be bent accurately.

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 used by being fitted and fixed in the knife fitting groove 3 formed in the knife holder 2 made of wood, resin, metal or the like. The knife fitting groove 3 is formed in advance into a predetermined shape (shape corresponding to a punching die) by, for example, laser processing. The knife fitted in the knife fitting groove 3 is precisely bent according to the shape of the fitting groove 3. The above knife A for bending
Is placed with one end along the longitudinal direction thereof, for example, the back 6 side along a surface plate (not shown), and is pressed by a bending die from one side surface of the knife A so that bending work can be performed. Then, the bent portion 5 is formed.

[0003]

However, in the conventional apparatus for bending the knife A as described above, the knife A is automatically supplied, but it is necessary to position the supplied knife. Positioning a knife like this
It is performed with reference to the front or back of the knife. Whether the length is long or short, the length of the knife A is stored in advance in the bending machine, so that there is substantially no difference whether the front end or the rear end of the knife A is used as a reference. . However, since the length of the knife A varies widely, it is not a good idea to determine the position from the beginning and supply the knife A when supplying it to the bending apparatus. This is because the position of the knife A may shift when the knife A is delivered from the knife supply device to the knife bending device. Therefore, in this apparatus, the knife A is fed to an appropriate position without positioning with respect to the feeding direction of the knife. Therefore, an object of the present invention is to provide a bending apparatus capable of always accurately positioning the knife regardless of the length of the knife.

[0004]

Means for Solving the Problems In order to achieve the above object, the means adopted by the present invention is the gist of the invention. In a device for bending a thin plate knife, the knife is along the longitudinal direction of the knife. A knife gripping mechanism that slidably grips the knife with one end side along the upper surface of the surface plate, and a relatively short length of gripping mechanism that is provided in the knife gripping mechanism and is retractable. The knife bending apparatus according to the present invention is provided with an abutting piece that comes into contact with the rear end of the knife in the feed direction, and a feed mechanism that feeds the knife gripping mechanism in the knife feed direction.

[0005]

In the bending apparatus having the above structure, when the knife is long, the knife is pushed by the knife gripping mechanism while the knife is gripped and the tip of the knife hits a predetermined positioning piece, thereby positioning the knife. Done. At this time, the abutting piece hits the side surface of the knife and is retracted, so that it does not interfere with the movement of the knife. On the other hand, if the knife is short, it will be sent by the delivery mechanism with the knife gripping mechanism open,
The rear edge of the knife hits the abutment piece and the knife is sent forward. In this state, the feeding mechanism advances the contact piece by the feed amount in accordance with the known knife size, so that the knife is positioned at the predetermined position.

[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 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, 8b form a highly precise flat surface in which the sandwiching surfaces closely contact each other so as to correct the warp of the sandwiched knife A. However, tooth-shaped irregularities may be formed to increase the frictional force with the knife A. As a result, the flatness of the bent portion of the knife A is improved, and the bending radius becomes constant regardless of the bending direction. After the bending process by the bending mechanism 10 described later is completed, the cylinder 30 is driven upward, and the clamp bar 16 is slid in the direction of arrow 22b. As a result, the holding member 8a is moved to the arrow 28b.
It is slidably driven in the direction, and the nipping of the knife A by the nipping members 8a and 8b is released. The above block 14
The hole 14b, which is a substantially central portion of the claw mechanism 12 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 immediate vicinity of the bending mechanism 10 as described later. 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,
The direction perpendicular to the plane of the paper 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 drastically reduced as compared with the case where the knife A is not stagnant, extremely efficient bending can be performed. 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 device, 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 knife pressing mechanism (not shown). It also has a control function of changing the feeding amount of the knife A each time bending is performed, for example. Therefore, in the device, the knife A is, for example, bellows-shaped, arc-shaped, or spiral-shaped (see FIG. 12).
It can be processed into various shapes.

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 radius of curvature of 5 mm, for example, when the knife A is bent, the feed amount of the knife A by the extrusion mechanism (not shown) is 0.5 m for each bending.
When the processing die 24 is operated with a constant bending operation amount while being fed out in 3 to 5 times at m pitches, 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 by 90 ° in a plan view, the knife A is bent by 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 is further bent at 45 ° by the processing die 24, so that it is visually bent at about 90 °. In the base 25 according to this embodiment, as shown in FIG.
Of the processing die 24 in the left-right direction at the upper portion of the holding position (see arrows 28a and 28b with respect to the upper surface of the surface plate 7).
Screw 37, 38 for finely adjusting the tilt angle)
Is screwed on. 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.
In order to send out a normal long knife (for example, 30 cm), the knife A is grasped and sent out by the claw mechanism 12 to be described later, and the knife tip is brought into contact with a predetermined contact portion to position the knife. .

As described above, the pawl mechanism 12 is provided with the contact piece 47 for pushing 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 40a and 40b are provided so as to face the upper surface of the base 41.
The a and 40b are supported by shafts 42 and 42 so as to be openable and closable. 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. The claw members 40a and 40b are opened and closed by being driven to move in and out. Then, when the claw members 40a, 40b are driven in the closing direction by the cylinder 45, the action of the anti-slip grooves 46, 46 formed on the opposing surface sides of the claw members 40a, 40b is performed. The knife A is clamped from both sides thereof. The claw member 40b
A contact piece 47 is provided inside the
Is rotatably supported by a pin 48 so as to be retractable with respect to the claw member 40b. The contact piece 47 is formed by the leaf spring 4
9 is always elastically urged in the direction of protruding. The base 41 is slidably supported by a slide bearing 50 in an arrow 27 direction and its opposite direction, and is slid via a ball screw member (not shown) by a stepping motor 51 that is controlled in conjunction with the motor 35. Driven. 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 provided so as to be supplied from the rear or the upper side of the delivery mechanism 11 and pass between the claw members 40a and 40b in the forward direction. In this case, the slant surface 47a of the contact piece 47 is pushed in the direction of the arrow 27 by the tip of the long knife, whereby the claw member 4 is pressed.
It escapes inside 0b and is immersed. This allows the knife to pass through. When handling such a long knife as described above, the stepping motor 51 is driven in the direction of arrow 27 with the base 41 holding the knife between the claw members 40a and 40b. Then, the position of the knife A is determined by bringing the tip of the knife A into contact with a predetermined contact portion. On the other hand, if 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 that the claw mechanism is not possible. 1
The contact piece 47 is fed to a predetermined position by the feed mechanism 11 while keeping 2 open. 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. Therefore, in the delivery mechanism 11, even a knife having a relatively short size can be reliably pushed to the predetermined position in the immediate vicinity of the bending mechanism 10 by pushing the rear end portion in the traveling direction.

[0012]

Since the bending apparatus according to the present invention is configured as described above, it is possible to perform a desired bending operation up to the vicinity of the end of the knife, and even a knife with a relatively short size can be used. It can be processed efficiently.

[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.

[Explanation of symbols]

6 ... Back 7 ... Surface plate 8 ... Clamping mechanism (supporting mechanism) 8a, 8b ... Clamping member 10 ... Bending mechanism 11 ... Delivery mechanism 12 ... Claw mechanism 24 ... Machining die 39 ... Control device 40a, 40b ...
Claw member 47 ... Abutting piece A ... Knife a ... Rear end

Claims (1)

[Claims] 1. A device for bending a thin plate-shaped knife, and a knife gripping mechanism for slidably gripping the knife with one end of the knife along the longitudinal direction being along the upper surface of a surface plate. An abutting piece which is provided in the knife gripping mechanism so as to be retractable and comes into contact with the trailing end of a relatively short knife gripped by the knife gripping mechanism in the feeding direction; and a feeding mechanism for feeding the knife gripping mechanism in the knife feeding direction. A bending device for a knife, comprising: