JP3171580B2 - Knife bending equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for bending a knife, and more particularly, to a method for punching a sheet of paper, plastic, corrugated cardboard or the like into a predetermined shape by a stamping press or the like, or for forming a fold on the sheet. The present invention relates to a knife bending apparatus for bending a long thin sheet processing knife (hereinafter simply referred to as a knife) into a predetermined shape.

[0002]

2. Description of the Related Art As shown in FIG. 8, for example, a knife A of this type is thin (for example, having a thickness of 0.4 to 3.0 mm), has a band shape, has a cutting edge 1, and has a substantially rectangular cross section. It is formed in a shape. The knife A is used by being fitted and fixed in a knife fitting groove 3 formed in a wooden (resin, metal, etc.) knife holding base 2. The knife fitting groove 3 is formed in a predetermined shape (a shape corresponding to a punching die) in advance by, for example, laser processing. The knife A fitted into such a knife fitting groove 3 is precisely bent in accordance with the shape of the fitting groove 3. Knife A for bending
The knife A is placed with its one end side along the longitudinal direction, for example, the back part 6 side, on a surface plate (not shown), and is bent by being pressed from one side surface of the knife A with a bending die. Thus, a bent portion 5 is formed. FIG. 9 is a perspective view showing the state of such bending. Knife A passes through the window D ₂ of the fixed die D _1, is fed in the arrow 27 direction by a stepping motor (not shown). Further, by the driving of another motor which is controlled synchronously with the stepping motor, the movable die D ₃ with respect to the die D ₁ is caused to relatively reciprocate in the arrow X direction. By moving the movable die D _{3 in} the direction of arrow X, the movable die D ₃ is moved.
_{When the} knife ₃ is pressed against the side of the knife A, the knife A is bent as shown by an arrow Y.

[0003]

[SUMMARY OF THE INVENTION Incidentally, the above-described conventional knife bending apparatus, in order to complete the bending of the knife A as quickly as possible, the speed of the motor for reciprocating the movable die D ₃ is relatively It was set to fast. However, when the movable die D ₃ while a relatively fast speed setting of the motor by pressing the sides of the knife A performs bending of the knife A, depending on the material of the knife A is the knife was sometimes damage such as cracking and chipping in the a and the movable die D ₃ occurs. In order to solve the problems in the prior art, the present invention is to improve a knife bending device, and it is possible to reduce the time for performing the knife bending process while minimizing cracking or chipping of the knife or die. It is an object of the present invention to provide a knife bending apparatus capable of preventing the bending.

[0004]

In order to achieve the above object, an invention according to claim 1 is to provide a movable die which reciprocates by driving a motor, and a movable die which is fed in a longitudinal direction in synchronization with the driving of the motor. In a knife bending apparatus which repeatedly presses the side of a thin plate-shaped knife to bend the knife in sequence, the movable die has the knife
While acting on the side of the
The speed of the above motor when the moving die is reciprocating
It is configured as a knife bending apparatus characterized in that the speed is switched from 10% to 50% . According to the bending apparatus of the knife according to the claim 1, the movable
Motor speed setting while the dies act on the side of the knife
Is the mode when the movable die is reciprocating.
Since the speed can be switched from 10% to 50% of the speed of the knife, it is possible to prevent the knife and the movable die from being damaged such as cracks and chips while shortening the time for bending the knife as much as possible. In addition, by setting the motor speed to a low speed when the movable die acts on the side of the knife, a larger torque can be obtained as compared with the case where the motor speed is set to a high speed. It can be adopted. Further, since the moving speed of the movable die acting on the knife is reduced, the movable die uniformly acts on the side of the knife to obtain good bending characteristics.

[0005]

Embodiments of the present invention will be described below with reference to the accompanying drawings to provide an understanding of the present invention.
It should be noted that the following embodiments are examples embodying the present invention, and do not limit the technical scope of the present invention. Here, FIG. 1 is a view for explaining a main part of a knife bending apparatus according to an embodiment of the present invention. First, as shown in FIG. 1, a knife bending apparatus according to an embodiment of the present invention includes a processing die (corresponding to a movable die) 24 which reciprocates in the directions of arrows 28a and 28b. In the longitudinal direction (arrow 2)
(7 directions) is repeatedly pressed against the side of a long thin plate-shaped knife A sent out to bend the knife A sequentially, and the rotation speed can be continuously adjusted and the set speed is maintained. And a sensor 1 for detecting the amount of movement of the machining die 24
01 and, based on the amount of movement of the machining die 24 detected by the sensor 101, the machining die 24
Acts on the side of knife A while the servomotor
With the speed setting of 30, the processing die 24 moves back and forth.
Of the rotation speed V ₁ of the servo motor 30
Control means 3 for switching from 0% to 50% rotational speed V ₂
9 is provided.

Next, the overall configuration and details of the knife bending apparatus will be described. Here, FIG.
4 are views for explaining the overall configuration of the knife bending apparatus, FIG. 2 is a side view thereof, FIG. 3 is a plan view thereof, and FIG. 4 is a front view thereof. . In the above knife bending apparatus, the long thin plate-shaped knife A to be bent is placed on the surface plate 7 with the cutting edge 1 facing upward and the back portion 6 along as shown in FIG. You. At a position facing the upper surface of the surface plate 7, a pressing device 9 including a pressing roller 31 is provided. The knife A placed on the surface plate 7 is slidable in the longitudinal direction of the knife A toward the upper surface of the surface plate 7 by the pressing roller 31. In addition, the knife A
The rear end is gripped by a pair of claw members (not shown) provided in the claw mechanism 12 slidable in the direction of arrow 27 as shown in FIG. A base (not shown) of the claw mechanism 12 is slidably driven by a stepping motor 51, whereby
The knife A is fed at a constant speed in the direction of arrow 27. Downstream of the pressing device 9 in the delivery direction of the knife A, a clamping mechanism 8 for slidably clamping the knife A is provided. The bending mechanism 10 for repeatedly pressing the dice 24 to sequentially bend the knife A is provided.
As shown in FIG. 5, the processing die 24 is integrally formed by a thin plate-like member,
When the knife A is penetrated through an appropriate gap, a hollow groove 24b having an edge portion 24a parallel to both sides of the knife A is integrally formed by, for example, wire cutting. The edge portion 24a is quenched. In this case, the above-mentioned appropriate gap means that when the processing die 24 is reciprocated as described later, the edge portion 24a is provided only on one side of the knife A.
This is a dimension that allows an operation for bringing into contact. On the front side of the processing die 24, an arc-shaped peripheral surface 24c (or a slope) having a radius of curvature R is carved to facilitate passage of the knife A after bending. Have been. The processing die 24 is detachably fitted into a base 25 (see FIG. 6) corresponding to a holder, and is held by screws at upper and lower positions. The lower end of the base 25 has a slide bearing 33 (FIG. 4).
), The knife A is supported so as to be able to reciprocate in a direction (directions of arrows 28a and 28b) perpendicular to the sending direction of the knife A (direction of arrow 27) as shown in the figure. The base 25 is reciprocated in the bending direction of the knife A by the servo motor 30 controlled by the control device 39 via the crank 34 together with the processing die 24. The servo motor 30 is controlled in synchronization with the stepping motor 51 by the control device 39, and reciprocating movement of the processing die 24 is performed in accordance with the knife A being sent out in the direction of the arrow 27 by the stepping motor 51. Done. Further, in the bending apparatus, the control device 39 determines the amount of bending operation for the knife A during the reciprocating operation of the processing die 24 and the amount of the knife A sent out by the sending mechanism 11, for example, in bending. It also has a function that can be changed each time it is done. Therefore, in this apparatus, the knife A can be processed into various shapes such as a bellows shape, an arc shape, and a spiral shape (see FIG. 7).

In the conventional knife bending apparatus, the rotation speed of the servomotor 30 is set to a relatively high value V such as, for example, a motor output rated speed, in order to perform the bending of the knife A as quickly as possible. _Was set to ₁ . However, if the rotational speed of the servo motor 30 and, consequently, the moving speed of the processing die 24 are too fast, an impact load is applied when the processing die 24 acts on the side of the knife A, and the knife A Depending on the material of A, in particular, the knife A or the processing die 24 may be used.
In some cases, defects such as cracks and chips occurred in the quenched part of the steel. Therefore, in the bending apparatus of the knife according to the present invention, while the machining die 24 acts on the side of the knife A, the control device 39, 10 of the rotational speed of the servo motor 30, velocity V ₁ % V about 50%
Can be switched to ₂ . The user sets the speed of the servo motor 30 via the control device 39 in advance. An input device 391 such as a keypad and an output device 392 such as an LCD panel are connected to the control device 39, and the user can select the knife A to be bent according to the thickness and hardness of the knife A. any speed, and for example, numerical input by the input device 391, after confirming the display of the output device 392 is set to the control unit 39 input contents as the velocity V _2. Note that the speed V ₁ and V ₂ is capable of specifying steplessly, the servo motor 30 performs servo control on the speed V ₁ and V _2, which is set to maintain the required time that speed. The amount of movement of the processing die 24 in the directions of arrows 28a and 28b is detected by the sensor 101. For the sensor 101, for example, a magnet scale can be used. Due to the rotation of the servo motor 30, the processing die 24 is moved by arrows 28a and 2a.
When reciprocating in the direction 8b, the movement amount at that time is detected by the sensor 101, and a pulse corresponding to the movement amount is output to the control device 39. The control device 39
Compares the detected amount based on the pulse from the sensor 101 with a preset set value l _1, and when the detected amount matches the set value l _1, it comes into contact with the side of the knife A. position until it is determined that the machining die 24 has moved, and sends the speed command to rotate by the speed V ₂ with respect to the servo motor 30. In this case, by switching to the speed V _2, the torque is also energizing. The speed V ₂ is set to 10% of the velocity V _1, when the rated torque when the speed V ₁ is assumed to be 2.39 nm, by performing deceleration to the velocity V _2, torque It is increased to approximately 10 times 23.9 Nm. The arrows 2 of the machining die 24 by the speed V ₂
When the processing die 24 comes into contact with the side of the knife A due to the reduction of the moving speed in the direction 8b, even if the edge 24a is slightly inclined with respect to the side of the knife A, The knife A becomes easy to slide on the surface plate 7 until the side of the knife A is parallel to the side of the knife A, and the knife A can be bent appropriately in combination with the increased power of the servomotor 30. Further, the above-energizing, because longer needs a large torque at the time of the speed V _1, the servo motor 30 small by it is possible to employ inexpensive, the cost reduction of the manufacturing apparatus, and miniaturization Can be planned. When the controller 39 determines that the processing die 24 has moved to the movement end position l ₂ of the processing die 24 based on a detection amount based on a pulse from the sensor 101, controller 39, with respect to the servo motor 30, and sends the speed command to switch the rotational speed from the speed V ₂ to the speed V _1. That is, in the knife bending apparatus, the processing die 24 is provided with the knife A.
Speed of the servo motor 30 only while acting is set to the low speed side V _2, the other arrows 28a, at 28b direction of reciprocation is set to a high speed side V ₁ to. The reason why the speed of the servo motor 30 is set to the low-speed side V ₂ is that, when viewed from the entire operation time of the servo motor, FIG.
As shown in (b), since the time is short, even when the knife is repeatedly bent to form a predetermined shape, the processing can be completed at a relatively high speed. Thus, according to the knife bending apparatus according to the embodiment of the present invention, the movable die is formed on the side of the knife.
During use, the motor speed is set, and the above movable die reciprocates.
10% to 50% of the speed of the motor when moving
%, It is possible to prevent the knife and the movable die from being damaged such as cracks and chips while shortening the time for bending the knife as much as possible. Moreover, by setting the motor speed to a low speed when the movable die acts on the side of the knife, a larger torque can be obtained as compared with the case where the motor speed is set to a high speed. It can be adopted.

The set value l ₁ to be compared with the detection amount based on the pulse from the sensor 101 is set in accordance with the position at which the processing die 24 comes into contact with the side of the knife A, The setting is made in accordance with the position immediately before contact with the side of the knife A. That is, switching from the velocity V ₁ to velocity V ₂ may be performed when the machining die 24 is in contact with the sides of the knife A, just before contact with the side portion of the knife A May go. Also,
The speed V ₂ may be a constant value or may be changed at a predetermined speed range. For example, the speed of the servo motor 30 is reduced exponentially from the position immediately before the processing die 24 contacts the side of the knife A until the processing die 24 contacts the side of the knife A. The speed of the motor 30 may be reduced, and the speed of the servomotor 30 may be continuously reduced while the processing die 24 is in contact with the knife A. Further, with respect to the control device 39, the numerical input instead of setting the speed V _2, the rewritable nonvolatile memory, and specifications of the blade member of the knife A, and a speed setting V ₂ accordingly leave several registers in pairs, the names and specifications of the blade material displayed on the output device 392, by the user selected using the input device 391, also be set to the speed V ₂ Good. Further, depending on the blade material, it is not necessary to set the speed of the servo motor 30 to a low speed. In that case, when the numeric input speed of the speed V _2, may be inputted values of the velocity V _1, a mode for bending while the velocity V _1, said from the speed V ₁ a key for selecting a mode for bending by lowering the speed to the speed V ₂ provided in the input device 391 may be operated with the key as needed. Further, the input device 391 and the output device 392 may use an LCD panel with a touch sensor serving as both. In the above embodiment, the processing die 2
4 is reciprocated linearly. However, the invention is not limited to this. For example, the processing die 24 may be reciprocated along a circumferential direction of a predetermined circle.

[0009]

As described above, according to the first aspect of the present invention, while the movable die acts on the side portion of the knife, the motor is moved.
The speed setting of the motor is such that the above movable die is reciprocating
Since the speed of the motor is switched from 10% to 50% of the speed at the time, the time for performing the bending of the knife is shortened as much as possible, and the knife and the movable die are not damaged or broken or chipped. This can be prevented. In addition, by setting the motor speed to a low speed when the movable die acts on the side of the knife, a larger torque can be obtained as compared with the case where the motor speed is set to a high speed. It can be adopted.
Further, since the moving speed of the movable die acting on the knife is reduced, the movable die uniformly acts on the side of the knife to obtain good bending characteristics.

[Brief description of the drawings]

FIG. 1 is a view for explaining a main configuration of a knife bending apparatus according to an embodiment of the present invention.

FIG. 2 is a side view of the entire knife bending apparatus.

FIG. 3 is a plan view of the entire knife bending apparatus.

FIG. 4 is a front view of the entire knife bending apparatus.

FIG. 5 is a perspective view showing a knife processing die of the knife bending apparatus, wherein FIG.
(B) is a front view, (C) is a plan view, (D) is a side view,
(E) is an enlarged sectional view of a main part in (C).

6A and 6B show a base for holding the processing die, wherein FIG. 6A is a front view and FIG. 6B is a plan view.

FIG. 7 is a diagram showing an example of bending performed by the knife bending apparatus.

FIG. 8 is a perspective view for explaining the prior art of the present invention, in a state before a knife is mounted on a knife holding table.

FIG. 9 is a view for explaining bending of a knife.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 6 ... Back part 7 ... Surface plate 10 ... Bending mechanism 12 ... Claw mechanism 21 ... Sending mechanism 24 ... Processing die 30 ... Servo motor 39 ... Control device 40 ... Claw members 51a, 51b ... Sliding member 52 ... Spring member 101 ... Sensor A: knife

Claims (1)

(57) [Claims] A movable die that reciprocates by driving a motor is repeatedly pressed against a side of a long thin plate-shaped knife that is sent out in a longitudinal direction in synchronization with the driving of the motor, and is sequentially bent on the knife. The movable die acts on the side of the knife while the movable die acts on the side of the knife.
Set the motor speed so that the movable die is reciprocating.
Wherein the speed of the motor is changed from 10% to 50% of the speed of the motor when the knife is bent.