JPS6034413Y2 - Press brake intermediate position stopping device - Google Patents

Description

[Detailed description of the invention] This invention relates to a press brake that lifts and lowers a long ram to perform processes such as bending, punching, and drawing into plate materials. This invention relates to an intermediate position stopping device for a press brake.

Generally, during press working, there are operations that require the ram to be temporarily stopped before processing the plate material.

This work requires backgauge,
Necessary when it is not possible to use abutment gauges such as front gauges and side gauges.

That is, the plate material is moved so that the upper die, which has been placed close to the plate material placed on the lower die, fits into the punching position by the marking lines drawn on the plate material or the punch.

At this time, it is necessary to bring the tip of the upper die and the plate as close as possible so that the worker can visually check from diagonally in front that the marking line or punch position is precisely on the descending line of the upper die. It is.

For this purpose, the approach speed of the ram should be slowed down and the ram should be temporarily stopped at a close position where the tip of the upper mold and the marking line or punch position can be confirmed from the left and right directions, and at a position where the plate material can be moved. is necessary.

However, it has been difficult to select this stopping position because the plate material is curved or twisted.

In addition to this, when replacing the mold, especially when replacing the upper mold,
It is necessary to temporarily stop the ram.

In other words, to replace the upper mold, release the fixing means between the ram and the upper mold, let it be guided by the longitudinal guide section of the ram, let the upper mold drop a little, and while it is engaged with the lower mold, move it in the longitudinal direction. Replace the drawer.

In order to move the upper mold in the longitudinal direction, the falling distance of the upper mold must be smaller than the distance in the front-back direction of the upper mold, and if it becomes too large, the upper mold will fall back and forth, which is very dangerous.

It was very difficult to select a stopping device to stop the ram once the above distance was achieved.

This invention effectively solves these problems in view of the conventional problems.The purpose of this invention is to easily select the intermediate stopping position of the ram, and to adjust the distance within a minute range. The present invention provides a press brake ram intermediate position stopping device.

According to this invention, this purpose is achieved by installing a switch in the pressure passage connecting the fluid pressure jack provided on the frame for raising and lowering the ram and the fluid pressure supply device so that the raising and lowering position of the ram can be set in several stages. A valve device and an intermediate position setting valve connected to the switching valve device and for controlling the vertical position of the ram are provided, and a switching actuation device for switching and controlling the intermediate position setting valve is provided in a part of the ram. By establishing a distant relative.

Hereinafter, a preferred embodiment of this invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows a front view of a press brake 1 equipped with a ram intermediate position stopping device according to this invention. It is of the type that goes up and down.

The ram intermediate position stop device 9 is connected to the hydraulic jack 5.
A switching valve device 13 that can set the vertical position of the ram 7 in several stages is installed in the pressure passage 15 connecting the fluid pressure supply device 11 and the hydraulic pressure supply device 11.
, an intermediate position setting valve 17 connected to this switching valve device 13 and controlling the vertical position of the ram 7, and a switching actuating device 19 for switching and controlling this intermediate position setting valve 17.

As shown in FIG. 1, in the switching actuating device 19, a feed screw 23 is rotatably supported on a bracket 21 fixed to the front side wall of the ram 7, and a nut 25.
A connecting rod 29 is connected via a pin 27.

Further, one end of a bell crank 33 is rotatably connected to the tip of the connecting rod 29 via a pin 31.
The other end of the bell crank 33 is connected to a sliding member 37 via a pin 39, which is provided to be slidable in the vertical direction along a guide member 35 provided on the side wall of the ram 7.

One end of an operating arm 43 is inserted into the guide member 35 and slides into contact with the lower surface of the sliding member 37 via a roller 41, and the center of the operating arm 43 is connected to a pin 43a
It is rotatably supported via a coil spring 45, and one end thereof is always biased in a direction to come into contact with the lower surface of the sliding member 37 via a coil spring 45.

The switching actuating device 19 is configured as described above, and the above-mentioned valve 17 is provided below the other end of the operating arm 43, which is attached to the frame 3 via the support plate 47.

This intermediate position setting valve 17 has a hollow cylinder 49.
A spool 53 is slidably installed inside the spool 53 via a spring 51, and the upper end of the spool 53 can come into contact with the other end of the operating arm 43.

The cylinder 49 of the intermediate position setting valve 17 has a first port 57a connected to the fluid pressure supply device 11 via a flow path 55, and a second switching port 57a of the switching valve device 13.
A second port 57b is provided which is connected to the second port 57b via the flow path 61.

Further, in the switching valve device 13, a spool 65 is slidably installed inside a hollow cylinder 63, and a pedal 69 is connected to the lower surface of the spool 65 via a bushing rod 67.
is connected.

The cylinder 63 includes a fluid pressure supply device 11 and a flow path 71.
A first switching port 59a connected to the intermediate position setting valve 17, a second switching port 59b connected to the intermediate position setting valve 17, and a third switching port 59c connected to the tank T are provided.

Further, the spool 65 is always urged in a protruding direction (downward in FIG. 1) via a spring 73 interposed between the lower surface of the cylinder 63 and the lower end flange portion 65a of the spool 65.

The fluid pressure supply device 11 is composed of a fluid pressure pump 75 and a drive motor 77.

Next, the operation of this invention, which differs from the above-described configuration, will be explained.

First, when the pedal 69 is depressed from the a□ position to the a2 position, the spool 65 of the switching valve device 13 rises from the al position to the a2 position, and at the same time, the flow path 55. The working pressure fluid that had been discharged into the tank 7T through the first switching port 59a and the third switching port 59c is stopped, and at the same time, the working pressure fluid is discharged and supplied to the fluid pressure jack 5 through the pressure passage 15. Ru.

When the working pressure fluid is discharged from the fluid pressure supply device 11 to the fluid pressure jack 5, the ram 7 and the feed screw 23. Connecting rod 29. Veri crank 33° guide member 35. and the sliding member 37 rise.

At this time, the roller 41 of the operating arm 43 is engaged with the lower end of the sliding member 37 by the coil spring 45, and the first
Rotating upward in the figure, the other end of the operating arm 43 pushes down the spool 53 of the intermediate position setting valve 17 against the elastic force of the spring 51.

This pushing down caused the first door, which had been closed, to open. The second ports 57a and 57b are electrically connected, and the operating pressure fluid is supplied to the flow path 61.
through the second switching port 59b of the switching valve device 13
, is discharged into the tank T through the third switching port 59c,
Ram 7 stops rising.

That is, the first position of the intermediate position setting valve 17. The second ports 57a and 57b are made conductive when the ram 7 rises, and the hydraulic jack 5 has an opening degree that maintains the oil pressure necessary to maintain the ram 7, while stopping the vertical movement of the ram 7.

For example, scribing is performed at the intermediate position of the ram where it stops in this manner.

At this time, as shown in FIG. 2, if the gap between the upper mold 79 and the workpiece W on the tabular shape 81 is too wide, rotate the feed screw 23 in the direction in which the nut 25 advances. When the connecting rod 29 is pushed to rotate the bell crank 33 and the sliding member 37 is pushed down, the operating arm 43 is rotated in a direction away from the spool 53 of the intermediate position setting valve 17.

Due to this rotation, the spool 53 is pushed up by the spring 51, the passage from the first port 57a to the second port 57b is closed, the oil pressure increases, and the fluid pressure jack 5 moves the ram 7 to the required clearance. When the ram 7 further rises until it reaches l, and then stops rotating the feed screw 23, the ram 7 stops rising.

After aligning the tip of the upper mold 79 with the marking line or punch hole,
When the pedal 69 is depressed to the position a3, the spool 65 of the switching valve device 13 enters the position a3, and the passage from the first switching port 59a to the third switching port 59C of the switching valve device 13 is closed. , the oil pressure of the working pressure fluid further increases, and the workpiece W finishes pressing.

Since the intermediate stop position of the ram 7 is set as described above, the ram 7 can be stopped at this stop position from now on.

Note that a detection shaft that can detect the state of engagement between the operating arm 43 and the spool 53 of the intermediate position setting valve 17 can be provided.

The tip of the detection shaft passes through, for example, the spool 53 and projects slightly from the upper surface of the spool 53, and the distal end passes through the intermediate position setting valve 17 and projects downward.

The state in which the operating arm 43 engages with this detection shaft and pushes down the detection shaft is detected by detection means such as a limit switch provided on the lower surface of the intermediate position setting valve 17.

Further, when the operating arm 43 pushes down the spool 53, the detection shaft is pushed down integrally with the spool 53.

In addition to using a detection shaft passing through the spool 53, such detection means can also include a limit switch on the support plate 47 to detect the engagement position between the operating arm 43 and the spool 53.

At this time, the operating arm 43 engages with the spool 53 and pushes down the spool 53, causing the first position of the intermediate position setting valve 17 to
It is also possible to select the optimum detection position so that the limit switch operates in a state where the working pressure fluid is supplied from the port 57a to the second port 57b and the ram 7 stops rising.

By providing such a detection means, the feed screw 23
can be distantly related to accurate rotational feed adjustment.

Next, FIG. 3 shows another embodiment of the hydraulic circuit of the ram intermediate position stop device 9, in which the switching valve device 13 in FIG. When stepping from position a1 to position a2,
A foot switch (not shown) provided at position a2 of the pedal 69 operates the electromagnetic valve 83.

This operation causes the hydraulic jack 5 to rise, causing the ram 7 to rise.

After marking and matching, when stepping on the petal 69 from the brown position to the a3 position, the electromagnetic valve 85 is activated by the foot switch (not shown), and pressing is performed.

Note that the other configurations are the same as those in the first embodiment, so the same reference numerals are given and detailed explanations are omitted.

Next, FIG. 4 shows a front view of essential parts of another embodiment of the ram intermediate position stopping device 9, in which the connecting rod 29a moves in the left-right direction as the feed screw 23a rotates and feeds.

A sliding plate 87 connected to the end of the connecting rod 29a is guided by upper and lower guide plates 89 and 91 and is provided so as to be movable in the left-right direction.

Furthermore, an inclined guide portion 95 is provided at the end of the sliding plate 87, and is always engaged with a rotating roller 93 provided at one end of the operating arm 43b.

Moreover, the rotational feed of the feed screw 23a can be detected by a detector 97, such as a rotary recorder, connected to the end of the feed screw 23a.

As shown in FIG. 2, when aligning the upper die 79 and the lower die 81, rotational feed is given to the feed screw 23a, and the bell crank 33a shown in FIG. is moved to the left, the operating arm 43b is rotated in the time direction, and the intermediate position confirmation signal from the aforementioned detection axis is transmitted.

The rotational feed rate of the feed screw 23a at the time of this transmission is detected by the detector 97.
The reference position of the detector 97 is determined.

By lowering the ram 7 below this reference position, that is, by detecting the distance between the spool 53 and the operating arm 43b with the detector 97 and reversing the feed screw 23a, the optimal scribing position can be found. .

As described above, according to this invention, a switching valve device is provided in the pressure passage connecting the fluid pressure jack for raising and lowering the ram attached to the frame and the fluid pressure supply device, which can set the raising and lowering position of the ram in several stages. , an intermediate position setting valve connected to the switching valve device and for controlling the vertical position of the ram is provided, and a switching actuation device for switching and controlling the intermediate position setting valve is provided in a part of the ram. As a result, the intermediate stop position of the ram 7 can be easily selected, and the distance can be adjusted within a small range, so that the marking and matching work can be performed reliably and easily.

It should be noted that this invention is not limited to the above-mentioned embodiments, and may be implemented in other embodiments.

[Brief explanation of the drawings] Fig. 1 is a front view of a press brake equipped with a ram intermediate position stopping device, Fig. 2 is an explanatory diagram of the scribing state, and Fig. 3 is a diagram showing the hydraulic circuit of the ram intermediate position stopping device. FIG. 4 is a front view of main parts of another embodiment of the ram intermediate position stopping device. Explanation of the main symbols shown in the drawings: 3...Frame, 5...Fluid pressure jack, 7...
- Ram, W... Work, 1... Press brake, 11... Fluid pressure supply device, 15...
...Pressure passage, 13...Switching valve device,
17... Intermediate position setting valve, 19...
・Switching actuation device.

Claims (1)

[Scope of utility model registration request] In the press brake 1, a ram 7 that can be raised and lowered by operating a hydraulic jack 5 is provided on a frame 3 erected on the left and right sides. and fluid pressure supply device 1
1, there is a switching valve device 13 that can set the elevation position of the ram 7 in several stages, and an intermediate position setting connected to the switching pipe device 13 and for controlling the elevation position of the ram 7. An intermediate position stopping device for a press brake, characterized in that a switching actuation device 19 for switching and controlling the intermediate position setting valve 17 is provided in a part of the ram 7.