JPS6020880Y2 - Pressing safety device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a press working safety device that prevents accidents during press work in a press machine.

A press device is used to sandwich a workpiece such as a metal plate between an upper mold and a lower mold, and to mold the workpiece into molds formed in the upper mold and lower mold. The die and the lower die are made of strong metal blocks and are designed to press the workpiece together with strong pressure.

Therefore, if a work accident were to occur in a press machine, there is a high possibility that it would be a major disaster, and for this reason, various safety measures have been conventionally taken.

For example, the power supply to the drive device for crimping the upper mold to the lower mold may be configured with multiple switches connected in series to call for attention, or the power supply between the upper mold and the lower mold may be A photoelectric safety device is installed at the work opening to control the drive device so that it does not operate when the light beam is blocked.

However, these safety measures are intended to increase safety until the upper mold is crimped to the lower mold, but they do not necessarily have any effect on accidents during or after the operation. was also not sufficient.

In other words, when crimping an upper mold to a lower mold, a part of the workpiece may fly out or scatter from the mold, causing unexpected accidents to workers during and after driving. Conventional safety measures were of no use.

The purpose of the present invention is to provide a press working safety device to avoid accidents during and after the transfer of the upper mold to the lower mold. In a press device that applies a workpiece mounted between both molds by pressing the mold against a lower mold by a drive device, one guide post is a presser foot that covers the mold and the workpiece. One end of a plate 3 is rotatably supported, the other end of the holding plate 3 has a notch, and the other guide post rotatably supports one end of a lever having a cam portion. , the other end of the lever has a protrusion that engages and holds the lever in the notch of the presser plate, and when the presser plate and the lever are in the engaged state, the lever is inserted into the lower mold of the upper mold. The drive device includes a switch operated by the cam and a plurality of switches electrically connected in series with the switch operated by the cam, and the switch and the switches of the plurality of stages are made conductive. It is distantly related to the press working safety device, which is characterized by starting the drive of the machine.

The press working safety device of the present invention will be explained in detail below with reference to the drawings.

FIG. 1 is a front perspective view of a press apparatus equipped with a press working safety device of the present invention, and FIG. 2 is a perspective view of the press apparatus as seen from the left side of the front perspective view of FIG. 1.

In FIGS. 1 and 2, 1 is an upper mold, 2 is a lower mold, 3 is a presser plate, 4 is a net that constitutes a part of the presser plate 3, 5 is a collar, 6 is a guide post, 7 is a shank, 8 is a lever, 9 is a protrusion, 10 is a microswitch, and 11 and 12 are switches such as a lever switch and a manual push button switch.

The press working safety device of the present invention is constructed as follows.

On the lower mold 2, two guide posts 6 are provided upwardly.

Above the lower mold 2 is an upper mold 1 which is provided with a collar 5 surrounding the guide post 6 and moves up and down along the guide post 6.

A shank 7 provided on the upper part of the upper mold 1 is connected to a drive device to perform vertical movement.

One end of the guide post 6 is engaged with the holding plate 3 having the net 4 so as to rotate around the guide post 6.

The presser plate 3 has a notch 21 at the other end in order to press the workpiece to a part of the lower mold 2, and the thickness of the plate at the end is an inclined shape 22 which is thinner at the tip and gradually thickens.

A lever 8 equipped with a cam 23 is fixed to the other guide post 6.

A protrusion 9 is provided on a part of the lever 8, and by rotating the lever 8 around the guide post 6 and engaging the protrusion 9 of the lever 8 with the notch 21 of the presser plate 3, the end of the presser plate 3 The holding plate 3 is pressed against the lower mold 2 more strongly.

When the lever 8 is secured to the presser plate 3 by the projection 9, the cam 23 presses the arm portion 24 of the microswitch 10.

The configuration is such that lever switches 11 and 12 are electrically connected in series to the microswitch 10.

As shown in the perspective view of FIG. 3, the switches 11 and 12 are manual push button switches 11 and 12 installed on the left and right sides of the lower mold 2 board surface of the press body, and are electrically connected in series to the microswitch 10. .

The operation is as follows.

First, a workpiece is placed at a predetermined position on the lower mold 2 in an open state as shown in FIG. 3, and the push plate 3 is rotated around the guide post 6 to press the workpiece onto the lower mold 2. do.

After that, rotate the lever 8 around the guide post 6,
The protrusion 9 provided on the lever 8 forms the inclined shape 2 of the presser plate 3.
3, so that the presser plate 3 is pressed against the lower mold 2 with great force, and the projection 9 of the lever 8 is bit into the notch 21 of the presser plate 3, and set as shown in FIG.

When this set is completed, the part supporting the lever 8, the cam, presses the chest of the microswitch 10, making the microswitch 10 conductive.

Thereafter, by turning on the lever switches 11 and 12, the drive device starts driving.

As the multiple stage switches 11 and 12 connected in series to the microswitch 10, manual push button switches 11 and 12 provided on the left and right sides of the lower mold board surface of the press body are used as shown in FIG. Type push button switch 11
and 12 may be made conductive to start driving the drive device.

Manual pushbutton switches 11 and 12 are shown in FIG. 5a.

It is electrically connected in series with the microswitch 10 as shown in FIG.

To make this conductive, the microswitch 10 is activated by the cam 2.
3 presses the arm portion 24.

That is, after placing the workpiece at a predetermined position on the lower mold 2 and completely setting the pressing plate 3 using the lever 8 and the protrusion 9, the workpiece is pressed with both hands as shown in Fig. 5. The drive device 26 starts driving by pushing the left and right manual pushbutton switches 11, 12 in the direction of the arrow.

Therefore, if the workpiece is improperly set in the lower mold 2, the push plate 3 cannot be pressed by the lever 8 and the protrusion 9, the cam 23 will not rotate, and the microswitch 10 will not be pressed and conduction will not occur.

Also, if you forget to set the workpiece in the lower mold 2, leave the push plate 3 open, set the lever 8, and make the micro switch 10 conductive, the left and right manual push button switches cannot be pressed with both hands. The drive device 26 cannot be driven unless this is done.

Even if the manual push button switch is pressed, conduction will not occur unless both the left and right hands are used, so both hands are outside the lower mold 2, and work accidents will not occur and it is safe.

When the drive device 26 starts operating, the upper mold 1 moves to the collar 5.
A downward movement is made along the guide post 6.

The workpiece interposed therebetween is processed by the cooperative action of the mold formed in the upper mold 1 and the mold formed in the lower mold 2.

Therefore, the press working safety device of the present invention prevents the pressing of the workpiece to the lower mold 2, the scattering of part of the workpiece to the worker, and the contact of the worker with the press equipment during operation. Since the blocking net is completely set, the upper mold 1 is allowed to move up and down, thereby ensuring sufficient safety.

In the above embodiments, the holding plate is provided with a net, but the present invention is not limited to this, and it goes without saying that the holding plate may be made integrally.

Furthermore, by providing an elastic member such as hard or flexane rubber on the side of the workpiece of the holding plate, it is possible to strongly press the workpiece to the lower mold, thereby further increasing safety.

In addition, although a lever with a protrusion is shown as a stopping member, a hook or the like may also be used as a stopping member.Furthermore, although a microswitch is shown as a switch, it is of course possible to use a photoelectric type or pressure type switch. be.

As mentioned above, the press working device of the present invention makes it possible to avoid accidents that occur during and after the driving of the upper mold 1 to the lower mold 2, and by combining this with conventional safety devices. Strong safety measures can be taken.

[Brief explanation of drawings]

Fig. 1 is a front perspective view of a press equipment equipped with the press working safety device of the present invention, Fig. 2 is a perspective view of the front perspective view of Fig. 1 seen from the left side, and Figs. 3 and 4 are the workpieces to be processed. FIG. 5 is a perspective view showing the state before and after setting in the process of setting an object, and FIG. 5 is a diagram showing an electrical wiring diagram. In the figure, 1 is an upper mold, 2 is a lower mold, 3 is a presser plate with a mesh 4, 8 is a lever (stopping member) with a protrusion 9, 10 is a micro switch, 21 is a notch, and 22 is an inclined shape, 2
3 is a cam, 24 is an arm of a microswitch, 25 is a knob, and 26 is a drive device.

Claims (1)

[Scope of utility model registration request] In a press machine that processes a workpiece mounted between the two molds by pressing an upper mold that moves up and down along a guide post against a lower mold using a drive device, one guide post presses the upper mold against the lower mold. One end of a presser plate covering the mold and the workpiece is rotatably supported, the other end of the presser plate has a notch, and the other guide post supports one end of a lever provided with a cam portion. The other end of the lever is pivotably supported and has a protrusion that engages and holds the lever in a notch of the presser plate.When the presser plate and the lever are in the engaged state, the upper mold A switch operated by the cam that allows pressing of the cam to the lower mold, and a plurality of switches electrically connected in series with the switch operated by the cam, and the switch and the switches in the plurality of stages are electrically connected. A press working safety device characterized in that the drive of the drive device is started by: