JPH039859Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention connects a slider, which is movably attached to the machine body and has a mold attached thereto, to a motor via a slider reciprocating means, and moves a blank from a coil material in a zigzag manner. The present invention relates to an improvement of a zigzag blanking device for blanking, and particularly relates to a protection mechanism when an excessive load occurs on a motor, slider reciprocating means, etc.

[Background technology and its problems]

A zigzag blanking device is used to remove blanks from coil material without waste. In this device, blanks and scraps of coil material may fall on the sliding surface between the slider and the machine body, and if the slider is moved back and forth in this state, an excessive load will be generated on the motor, slider reciprocation means, etc., resulting in damage. There is.

Therefore, it is necessary to detect excessive load to prevent damage, but it is difficult to control the motor by detecting changes in the motor's current value because the motor's current value is limited. is practically difficult. For this reason, it is conceivable to use a thermal sensor to detect the heat generated by the motor when an excessive load occurs. However, according to this method, it takes time for the motor to generate heat, so there is a problem that overload cannot be detected instantaneously.

[Purpose of invention]

An object of the present invention is to provide a zigzag blanking device that can quickly and reliably prevent damage when an excessive load is applied.

[Means and actions for solving problems]

The present invention focuses on the fact that when an excessive load is applied to the motor, a rotational force is applied to the motor in the direction opposite to the rotation axis of the motor.

Specifically, the present invention supports the motor so that it can rotate in the rotational direction of the motor drive shaft, and also interposes an elastic body between the motor and the motor mounting part, so that the motor drive shaft can be A sensor is provided to detect rotation when a load is applied and the motor rotates in a direction opposite to the rotational direction of the motor drive shaft due to a rotational reaction force, and a motor control means is provided to stop driving the motor upon receiving a detection signal from the sensor. It was established.

As a result, if an excessive load is applied to the motor, slider reciprocating means, etc., the drive of the motor is stopped to achieve the above objective.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on the drawings.

3 and 4 show the overall configuration in which the zigzag blanking device is applied to a zigzag blanking press. In FIGS. 3 and 4, a press column 2 is erected around the machine body 1, and a crown 3 is provided on the top of the column 2. A slide 4 is attached below the crown 3 so as to be movable in the vertical direction.
Below this slide 4 and on both front and rear sides of the upper part of the body 1, guides 5 are attached.
A slider 7 is provided to be able to freely reciprocate through a sliding portion 6, and a mold 8 is attached to the slider 7. A slider reciprocating means 9 is connected to the slider 7, a motor 11 consisting of a servo motor is connected to the slider reciprocating means 9, and the motor 11 is mounted on a bracket 1 as a motor mounting portion.
It is attached to the fuselage 1 via 0. As a result, when the motor 11 is rotated forward and backward at each predetermined cycle, the slider 7 is moved back and forth, and as the slide 4 is moved up and down, a blank is punched out in a zigzag pattern from a coil material (not shown). It is like that.

The slider reciprocating means 9 includes a nut member 2 attached to the slider 7, as shown in FIG.
1, this nut member 21 is equipped with a ball screw 2
2, and this ball screw 22 is rotatably attached to the center and end portions of the body 1 via bearings 23. A buffer member 24 made of urethane rubber or the like is attached to the opposing surfaces of these bearings 23 to prevent damage to the nut member 21 and the like when the nut member 21 overruns. The ball screw 22 extends through a bearing 23 attached to the end of the body, and a timing pulley 25 is provided at the end thereof. A timing belt 28 is wound around this pulley 25 and a timing pulley 27 attached to the drive shaft 26 of the motor 11, and when the motor 11 is operated, the timing belt 28, the ball screw 22, and the nut member 21 are wound. The slider 7 is reciprocated through it. On this occasion,
The nut member 21, the ball screw 22, the pulley 2
5, 27, a timing belt 28, and the like constitute a slider reciprocating means 9.

The motor 11 is connected to a motor base 33 by a motor support member 31 and a motor support U bolt 32.
installed on. A hole 33A is formed in the motor base 33, as shown in an enlarged view in FIG. has been done. A washer 36 is provided between the top of the bolt 35 and the top of the spacer 37, and urethane rubber 34 as an elastic body is provided between the washer 36 and the motor base 33 and between the motor base 33 and the bracket 10. Each is interposed. At this time, extra pressure is applied to the urethane rubber 34 by tightening the bolt 35 to the height of the spacer 37. Also,
A predetermined gap is provided between the spacer 37 and the hole 33A, allowing the motor base 33 to swing relative to the bolt 35. Such a structure in which urethane rubber 34 is interposed between the motor base 33 and the bracket 10 is formed at each of the four corners of the motor base 33 (only two locations are shown in FIG. 1), and the motor base 33 is connected to the motor 11. It is also configured to be able to rotate in the rotational direction of the motor drive shaft 26. Further, the bracket 10 is provided with a tension adjustment device 40, which allows the bracket 10 to be moved vertically with respect to the machine body 1, so that the pulley 2
Timing belt 28 wound between 5 and 27
The tension can be adjusted.

Sensors 50 are provided below the motor base 33 of the bracket 10 and on both sides of the drawing in the direction penetrating the plane of the paper (see FIG. 5). When a predetermined load or more is applied to the motor drive shaft 26 and the motor base 33 and the motor 11 are rotated in a direction opposite to the rotation direction of the drive shaft 26, the rotation of the motor base 33 can be detected. This sensor 50 is electrically connected to a motor control means 51, and this motor control means 51 is electrically connected to the motor 11, and receives a detection signal when the motor base 33 is rotated to control the motor 11. The drive of the vehicle has been discontinued.

Next, the operation of this embodiment will be explained.

When the motor 11 is operated, the slider 7 is reciprocated via the timing belt 28, the ball screw 22, the nut member 21, etc., while the slider 4
is reciprocated in the vertical direction, and a blank is punched out in a zigzag pattern from a coil material (not shown).

At this time, the sliding part 6 between the guide 5 and the slider 7
When the blank or the coil material from which the blank is punched falls, the reciprocating movement of the slider 7 is restricted, and this restriction of the movement of the slider 7 causes the slider 7, the nut member 21, the ball screw 22, the pulleys 25, 27, Excessive load occurs on the motor 11 and the like.
Along with this, the motor 11 is rotated in a direction opposite to the rotation direction of the drive shaft 26. As a result, as shown in FIG. 5, the motor base 33 attached to the motor 11 is also rotated in the same direction, and the motor base 33 is rotated in the same direction.
approaches one of the sensors 50 and the sensor 5
This rotation will be detected at a distance to the other side of 0. As a result of this detection, a detection signal is sent from the sensor 50 to the motor control means 51, and upon receiving this detection signal, the motor control means sends a signal to stop driving the motor 11, and the driving of the motor 11 is stopped. Excessive load on the screw 22, nut member 21, etc. is prevented.

According to this embodiment, even if an excessive load is applied to the motor 11, the ball screw 22, the nut member 21, etc., the driving of the motor 11 is stopped.
These damages can be quickly and reliably prevented. Furthermore, since the sensor 50, motor control means 51, etc. are used, by connecting these to an alarm device, it is possible to remotely monitor whether or not the zigzag blanking device is operating normally, reducing the burden on the operator. Ru. Furthermore, since the urethane rubber 34 is interposed between the motor base 33 and the bracket 10, it also provides a vibration-proofing effect during normal operation. Furthermore, in this embodiment, since the elastic body is made of urethane rubber 34, processing for interposing it between the motor base 33 and the bracket 10 is easy to perform. Furthermore, since the spacer 37 is interposed between the urethane rubber 34 and the bolt 35, extra pressure can be applied to the urethane rubber 34 to prevent it from shifting in the horizontal direction.

In the above embodiment, the slider reciprocating means 9 is composed of a nut member 21, a ball screw 22, etc.
Although the motor 11 is constructed from a servo motor, the slider reciprocating means of the present invention may be configured to reciprocate the slider 7 using an eccentric plate or the like, and the motor 11 may be a motor other than a servo motor. In this case, the motor may be configured to rotate in only one direction, and in this case, the sensor 50 may be provided on either side instead of on both sides. Further, two urethane rubbers 34 were provided on the bracket 10 side and the washer 36 side with the motor base 33 in between.
In the present invention, urethane rubber 34 may be provided between the motor base 33 and the bracket 10. However, if the urethane rubber 34 is provided on both sides of the motor base 33 as in the embodiment described above, the rotation of the motor base 33 can be detected reliably and easily. Furthermore, the elastic body is not limited to the urethane rubber 34, but may be an elastic body such as a spring. In addition, the motor mounting portion is not limited to the bracket 10, but is also applicable to the fuselage 1, column 2,
It may also be a floor on which a press is placed. moreover,
The motor base 33 does not necessarily need to be provided, and an elastic body such as urethane rubber 34 can be directly attached to the motor 1.
1 and the motor mounting portion of the bracket 10. Furthermore, the zigzag blanking device of the present invention is not limited to being applied to a zigzag blanking press, but may be applied to the first stage of a transfer press.

[Effect of idea]

According to the present invention as described above, even if an excessive load is applied to the zigzag blanking device, damage to the zigzag blanking device can be quickly and reliably prevented.

[Brief explanation of the drawing]

Fig. 1 is an enlarged schematic configuration diagram of the main parts of an embodiment of the present invention, Fig. 2 is an enlarged sectional view showing a state in which the elastic body is interposed between the motor base and the bracket, and Fig. 3 is FIG. 4 is a schematic front view of the embodiment, FIG. 5 is a schematic side view of the embodiment, and FIG. 5 is an explanatory diagram of the operation of the embodiment. 1... Airframe, 7... Slider, 8... Mold, 9
... Slider reciprocating means, 10 ... Bracket as motor mounting part, 11 ... Motor, 34 ... Urethane rubber as elastic body, 50 ... Sensor, 5
1...Motor control means.

Claims (1)

[Scope of utility model registration request] In a zigzag blanking device for punching a blank from a coil material in a zigzag manner, a slider movably attached to the machine body and to which a mold is attached is connected to a motor via a slider reciprocating means, and the motor is moved in the rotational direction of the motor drive shaft. In addition to supporting the motor so that it can rotate, an elastic body is interposed between the motor and the motor mounting part, and when a load of more than a predetermined value is applied to the motor drive shaft, the motor is rotated in the opposite direction to the rotation direction of the motor drive shaft due to rotational reaction force. A zigzag blanking device comprising: a sensor that detects the rotation when the motor rotates; and a motor control means that receives a detection signal from the sensor and stops driving the motor.