JPS6035546Y2 - Anti-back device in shear line - Google Patents

Description

[Detailed description of the invention] This invention relates to an anti-back device in a shearing line, and more specifically, to an anti-back device that prevents a workpiece from moving backward in a shearing line that sends a workpiece (material) to a shearing machine. .

Generally, in the shear line, as shown in Figure 1,
A plate-shaped workpiece (hereinafter referred to as a plate material) W is fed by the feed roll 1, then stopped and cut by the shearing machine 3 (it is fed onto the table 5 of the shearing machine 3, and the position of the lower blade 7 is The plate material W fed beyond the point is cut by this lower blade 7 and the upper blade 9 which is driven up and down), so the plate material W is cut into a loop shape (marked with
It is necessary to install it in the part indicated by □).

However, in such a shear line, when the feeding of the plate material W is stopped due to an emergency stop, for example, the plate material W moves backward due to its own weight.

Conventionally, as shown in Fig. 1, since the plate material W moves backward as described above, a one-way clutch is attached to the roll to allow rotation in only one direction (the direction in which normal feeding should be carried out). A roll 11 is provided in front of the feed roll 1 (on the left side in FIG. 1), and the anti-back roll 11 prevents the plate material W from moving back.

However, even in this case, when the feed roll 1 is reversed, the plate material W may be bent into an arched shape between the anti-back roll 11 and the feed roll 1, as shown by the broken line in FIG.

Further, even during line operation, if the feed roll 1, which positions the plate material W for running and stopping, feeds the plate material W too far, it rotates in the opposite direction to move the plate material W backward, and the lower blade 7 Since the length of the plate material W that has been fed beyond this point is controlled to be the regular size, in the method using the conventional anti-back roll 11, There is a drawback that the above-mentioned bending phenomenon occurs.

Furthermore, when the plate material W is a thick plate, it is difficult to bend the plate material W, so it is impossible to move the plate material W back, and in such a case, there is a disadvantage that dimensional accuracy deteriorates because the plate material W is difficult to bend. there were.

This invention eliminates the above-mentioned drawbacks and prevents bending of the board and deterioration of dimensional accuracy during shear line operation, and also prevents backtracking of the board during emergency stops, work interruptions, power outages, etc. The object of the present invention is to provide an anti-back device that can prevent bending caused by bending.

A preferred embodiment of this invention will be described below with reference to the accompanying drawings.

FIG. 2 is a side view schematically showing an anti-back device for a shear line implementing this invention, and the same components as those in FIG.

In FIG. 2, a pinch roll 13 is installed in front of the feed roll 1 (on the left side in FIG. 2) by an appropriate means (not shown).

The plate material W is held between a pair of rolls above the pinch rolls 13.

On the other hand, in this embodiment, the shearing machine 3 that cuts the sheet material W that has passed through the pinch rolls 13 and the feed rolls 1 is provided with a sheet material backtracking prevention mechanism 15 that constitutes an anti-back device at the front of the shearing machine 3. .

This sheet material backtracking prevention mechanism 15 is operated to sandwich the sheet material W, and generally consists of a bracket 17 attached to the front part of the shearing machine 3, and an air cylinder 19, for example, attached upward to the bracket 17.
A pressing actuating device such as the one shown in FIG. It is comprised of a bullet 23, such as a spring, interposed between the rod portion.

The plate holding member 21 is attached to the rod part so as to face the upper surface of the table 5 of the shearing machine, and is urged downward by the elastic machine 23.

FIG. 2 shows a case where the rod portion of the air cylinder 19 has been raised and the plate holding portion 21 has been pulled upward as will be described later.

FIGS. 3 and 4 are a front view of the shearing machine 3 to which the sheet material backtracking prevention mechanism 15 is attached, and an enlarged side view showing a part of the sheet material holding mechanism 15 in cross section.

In FIG. 3, the bracket 17 is formed in a substantially square shape, and is attached to the front plate 25 of the shearing machine 3 near the center in the left-right direction by a fastener 27 such as a bolt.

The air cylinder 19 is attached to the lower part of the square-shaped bracket 17 using an appropriate fastener 29 such as a bolt or nut.

The mounting height of the air cylinder 17 in the vertical direction is as described below. It is selected so that it can reach W and press down the plate material W.

In FIG. 4, the rod portion 31 of the air cylinder 19
A collar 33 is inserted therein, and the aforementioned ammunition 23 is interposed on the outside of this collar 33.

Further, the plate holding portion 21 is attached to the small diameter portion of the tip of the rod portion 31 by appropriate means such as a flat head screw, as shown in the figure, and an elastic member 35 such as a urethane bat is attached to the lower surface thereof. ing.

In this embodiment, the above-mentioned shearing machine 3
The distance from the front plate 25 to the center of the rod part is 85 m.
m, and the diameter of the elastic member was 78TrrIn.

Further, FIGS. 3 and 4 also show a state in which the plate holding part 21 is pulled upward, but the distance between the plate holding part 21 and the table 5 surface in this case is set to 2-.

FIG. 5 shows an example of a circuit diagram of an anti-back device.

In the same figure, a 2-circuit 3-notch selector switch SS
W is the first and second switching contact 5SW1, 5SW2
and can be switched to three switching positions, first to third, as exemplified by symbols I, n, and III.

In this selector switch SSW, in the first switching position I, the first switching contact 5SW1 is on, and in the second switching position ■, both the first and second switching contacts 5SW1 and 5SW2 are off. In the third switching position ■, the second switching contact 5SW2
is on.

The above-mentioned first and second switching contacts SSW□.

Each end of 5SW2 is connected to one power line 3 via a normally open contact ESR1 of an emergency stop auxiliary relay, which will be described later.
7, and the other end of the first switching contact 5SW1 is connected to the coil AB of the first relay for assisting anti-back rise.
Coil A of the second relay for assisting X and anti-back rise
It is connected to the other power supply line 39 via a parallel circuit in which the BR and the BR are connected in parallel.

The other end of the second switching contact 5SW2 is connected to the above-mentioned parallel circuit via, for example, an automatic return type anti-back lowering push button switch PR and an anti-back raising push button switch PB□. It is connected to the.

Further, a self-holding contact (normally open contact) ABR of the second anti-back lift assisting relay is connected in parallel to the push button switch PB1.

As shown in the figure, the push button switch PB1 is
The pushbutton switch PB2 is normally open, and the pushbutton switch PB2 is normally closed.

Further, between each of the power lines 37 and 39, there is another normally open contact AB of the first relay for assisting the anti-back rise.
A drive circuit in which R2 and the solenoid SQL for driving the air cylinder 19 described above are connected in series is connected, and an indicator light PL, 1 for anti-back rise display is connected in parallel to this Tsuremade SQL. It is connected.

Further, the emergency stop button EPB is connected to first and second contacts EPB1. EPB2, and when this emergency stop button EPB is operated, the first contact EPB1 opens and the second contact EPB2 opens.

One end of each of the first and second contacts EPB and EPB2 is connected to one power line 37, and the other end of the first contact EPB is connected to the emergency stop indicator PL2.
The other end of the second contact EPB2 is connected to the other power line 39 via the coil E of the relay for emergency stop assistance.
It is connected to the other power supply line 39 via SR.

Note that the normally closed contact ESR2 of the emergency stop auxiliary relay is connected in parallel to the first contact EPB1.

Next, the operation of the anti-back device configured as described above will be explained.

In FIG. 5, it is assumed that the first contact EPB□ of the emergency stop button EPB is in the open state, the second contact EPB2 is in the closed state, and the selector switch SSW is in the switching state to the first switching position I. .

In this state, the coil ESR of the emergency stop assist relay is energized via the second contact EPB2 in the closed state, so its normally open contact ESR1 is switched to the on state, Also, since the first switching contact SSW of the selector switch SSW is in the on state, the coil ABX of the first relay for anti-back rise assist and the coil of the second relay for anti-back rise assist ABR is energized.

Therefore, since the normally open contact ABR2 of the second relay for assisting anti-back elevation is switched to the on state, the solenoid SQL is energized, and the indicator light PL1 is also energized, and the air cylinder 19 mentioned above is energized. Rondo part 3
1 is pulled upwards.

Therefore, as shown in FIGS. 2 to 4, the plate holding portion 21
is pulled upward from the top surface of the table 5 of the shearing machine 3.

That is, the anti-back is increasing, and the lighting of the indicator light PL1 indicates that the anti-back is increasing.

In such a case, as shown in FIG. 2, the plate material W is sent to the upper surface of the table 5 of the shearing machine 3 and passes under the plate holding part 21 which is being pulled up.

Now, to explain the case of an emergency stop, in this emergency stop, when the emergency stop button EPB is pressed, the second contact EPB2 is opened, thereby cutting off the current to the coil ESR, and the normally open contact ESR1 is in the OFF state. As a result, the current flow to the coils ABX and ABR of the anti-back lift assisting relay is also cut off.

As a result, the normally open switching contact ABR2 returns to the OFF state, power to the solenoid SQL is cut off, and the indicator light PL is also turned off.

On the other hand, the indicator light PI, 2 lights up to display an emergency stop.

Therefore, the anti-back moves downward, and the rond part 31 of the air cylinder 19 extends, and the plate holding part 21 attached to the lower part presses the plate material W onto the table 5 of the shearing machine 3, thereby preventing the plate material W from returning. It can be prevented.

Further, since the elastic member 35 such as a urethane bat is provided on the lower surface of the plate holding part 21 as described above, it is possible to prevent scratches from occurring when the plate material W is held down.

In addition, the rod portion 31 is provided with a bullet 23 to strengthen the plate-holding force in the above-mentioned case, that is, to increase the plate-pressing force. The plate material W can be held down with only a force of 23.

That is, even during a power outage, the plate material W can be held down by the force of the bullet 23.

In this way, the anti-back device automatically operates during an emergency stop.

Next, referring to FIG. 5, a case will be described in which the selector switch SSW is switched to the second switching position (2).

1 In this second switching position H, the first and second switching contacts 5SW1 and 5SW2 are both in the OFF state, so the power to the coils ABX and ABR is cut off, and the The back will descend.

Furthermore, to explain the case where the selector switch SSW is switched to the third switching source position ■, in this case, the second
The switching contact 5SW2 is in the on state, but since the push button switch PB1 is open, the coils ABX and ABR are not energized.

However, in this case, the anti-back can be increased by pressing the push button switch PB.

That is, when the pushbutton switch PB1 is pressed, the coil ABR is energized and at the same time the self-holding contact ABR1 is turned on and self-held, thereby the normally open contact ABR2 is turned on and the above-mentioned operation is performed. Similarly, the anti-back increases and this is also indicated by the lighting of the display PL1.

In such a case, when it is desired to lower the anti-back due to interruption of work, for example, the anti-back can be lowered by pressing the push button switch PB2 to release the above-mentioned self-holding.

In this way, in the third switching position (3) of the selector switch SSW, the anti-back can be raised and lowered.

Therefore, when the work is interrupted, the operation can be switched in this manner.

Further, the circuit configuration shown in FIG. 5 is such that the anti-back is lowered unless the solenoid SQL for raising the anti-back is energized.

Therefore, when the vehicle is stopped, the anti-back device is lowered, and as described above, even during a power outage, the anti-back device is activated, and the plate material W can be held down by the force of the ammunition 23.

In addition, as shown in FIG. 2, a simple pinch roll 13 that can rotate in both directions and just pinches the plate material W can be used as an anti-bank roll without using a one-way clutch. There is no possibility that the dimensional accuracy will be deteriorated, and furthermore, the back movement of the plate material W can be prevented.

As can be understood from the above description of the embodiments, the gist of the present invention is as stated in the claims for utility model registration, so it is possible to backtrack the work even during emergency stops, work interruptions, and power outages. In addition to being able to prevent
This invention has excellent effects such as preventing bending of the workpiece and deterioration of dimensional accuracy during operation of the shear line. Note that this invention is not limited to the above-mentioned embodiments, and can be applied to This invention can be implemented in aspects other than the embodiments, and the symbols appended to the claims of the utility model registration do not limit the technical scope of this invention.

[Brief explanation of drawings]

FIG. 1 is a side view illustrating a conventional anti-back device;
Fig. 2 is a side view showing an anti-back device in a shearing line in which this invention was implemented, Fig. 3 is a front view of a shearing machine equipped with the plate material holding mechanism of the same device, and Fig. 4 is a side view of the shearing machine equipped with the plate material holding mechanism of the same device. FIG. 5, an enlarged side view with a portion in section, is an electrical circuit diagram of the anti-back device. Explanation of main symbols shown in the drawings, W...
Workpiece, 3... Shearing machine, 15...
...Mechanism to prevent plate material from moving back.

Claims (1)

[Scope of utility model registration request] The shear line is equipped with a feed roll 1 that feeds the workpiece W to the shearing machine 3, and the workpiece W is placed above the table 5 provided in the shearing machine 3 on the workpiece delivery side than the feed roll 1. A press actuating device comprising a plate holding member that can be pressed against the table 5 so as to be movable up and down is arranged and provided, and the plate holding member in the press actuating device is always biased downward by an elastic member, and the press actuating device An anti-back device for a shear line, characterized in that a control circuit for controlling the operation of the device is provided with a drive circuit for driving a pressing device to raise the plate holding member only when electricity is applied.