JP2591768Y2 - Press brake ram inclination detector - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ram inclination detecting device of a press brake for bending a plate-like work.

[0002]

2. Description of the Related Art Conventionally, a press brake for bending a plate-shaped work is provided with a ram that is moved up and down by hydraulic cylinders provided on the left and right sides. The work is configured to bend between the lower molds fixed to the work. In press brakes such as those described above, the work is usually placed near the center of the ram and bent so that the load is applied to the left and right hydraulic cylinders in a balanced manner.However, depending on the product, bending may be performed at an eccentric position. is there.

[0003]

In the conventional press brake, when the eccentric bending is performed, the parallelism of the ram is lost, and the ram may be inclined. As a result, the ram cannot be moved up and down smoothly, There were problems such as breakage of the brake itself. To prevent such problems,
For example, Japanese Utility Model Laid-Open No. 52-26506 and Japanese Utility Model 2-42.
No. 330, Japanese Patent Publication No. 57-61490,
Press brake was automatically stopped by detecting the inclination of
When the inclination of the ram is detected, the hydraulic cylinder is controlled and
A ram tilt detector that corrects the ram tilt
Proposed. However, any of the publications discloses a ram inclination detecting device.
The installation is also complicated, and
You. The present invention has been made in order to improve such a problem, and a simple structure of a press brake ram inclination detecting device that automatically stops the operation when the ram is inclined by a certain amount or more.
The purpose is to provide a simple and inexpensive .

[0004]

According to the present invention, in order to achieve the above object, the ram is moved up and down by hydraulic cylinders installed on the upper left and right sides of the press brake body, and the upper die attached to the ram and the table are mounted on the table. In a press brake that bends a workpiece between fixed lower dies,
Attach a plate dog to the piston rod of the above hydraulic cylinder
When the ram is tilted more than a certain amount,
A tilt detection switch operated by the dog is provided, and the operation of the press brake body is stopped by a detection signal of the tilt detection switch.

[0005]

[Work] With the above configuration, when the ram is tilted by a certain amount or more, the tilt detection switch detects this and automatically stops the operation of the press brake main body, so that the press brake main body can be prevented from being damaged beforehand. .

[0006]

[Embodiment] An embodiment of the present invention will be described in detail with reference to the drawings. In the figure, reference numeral 1 denotes a press brake body, which has a ram 3 which is moved up and down by a pair of hydraulic cylinders 2 provided on the right and left upper portions, and an upper die attached to a lower portion of the ram 3 and fixed on a table. The plate-shaped work can be bent by the formed lower mold (neither is shown).

As shown in FIG. 3, one end of a plate-shaped dog 4 is horizontally fixed to one end of a piston rod 2a projected downward by each of the hydraulic cylinders 2. A V-shaped groove 4a is formed at the other end of the dog 4, and an operating portion 5 of the tilt detection switch 5 is formed in the groove 4a.
The roller 5b attached to the tip a is fitted. The tilt detection switch 5 is attached to the ram 3 and has a certain gap a between the outer peripheral surface of the roller 5b and the concave groove 4a.
b is set and the tilt detection switch 5
Is electrically connected to an operation circuit (not shown) of the press brake main body 1, and when the tilt detection switch 5 operates, the operation of the press brake main body 1 is stopped.

Next, the operation will be described. In bending the work, the work is positioned between the upper mold attached to the ram 3 and the lower mold fixed on the table. When the work is at an eccentric position with respect to the ram 3, an eccentric load acts on the left and right hydraulic cylinders 2 and the ram 3 may be inclined. When the inclination of the ram 3 is within a preset range, the inclination detection switch 5 does not operate, so that the eccentric bending can be performed as it is. However, when the inclination of the ram 3 exceeds the set amount, the V groove 4a of the dog 4 and the inclination detection switch 5 One of the gaps a and b between the rollers 5b disappears and the tilt detection switch 5 operates, so that the operation of the press brake body 1 is automatically stopped. This makes it possible to prevent the press brake body 1 from being damaged.

In the above embodiment, the tilt detection switch 5 is operated by the dog 4, but it may be operated in a non-contact manner using light or the like.

[0010]

[Effects of the Invention] As described in detail above, when the ram is tilted by a certain amount or more during the eccentric bending, the piston of the hydraulic cylinder is rotated.
The dog attached to the ston rod operates the tilt detection switch.
Since the operation of the press brake is automatically stopped by the detection signal from the inclination detection switch, it is possible to prevent the press brake itself from being damaged due to the inclination of the ram. In addition, the dog mounted on the piston rod of the hydraulic cylinder operates the tilt detection switch installed on the ram side at a position distant from the hydraulic cylinder, so that the tilt of the ram can be expanded and detected. The inclination can be accurately detected. In addition, it is attached to the piston rod of the hydraulic cylinder.
Attached plate-shaped dog and tilt attached to the ram side
Operation is reliable due to the simple configuration consisting of a detection switch
And there is almost no fear of failure, and it is easy to manufacture
Therefore, it can be provided at low cost.

[Brief description of the drawings]

FIG. 1 is a plan view of a press brake provided with an inclination detecting device according to an embodiment of the present invention.

FIG. 2 is a rear view of a press brake provided with an inclination detecting device according to an embodiment of the present invention.

FIG. 3 is an enlarged view of a tilt detection device according to an embodiment of the present invention.

[Explanation of symbols]

1 ... Press brake body, 2 ... Hydraulic cylinder, 3 ... Ram, 5 ... Tilt detection switch.

Claims (1)

(57) [Scope of request for utility model registration] 1. A ram 3 is moved up and down by a hydraulic cylinder 2 installed on the left and right upper portions of a press brake main body 1 to bend a work between an upper die attached to the ram 3 and a lower die fixed to a table. In the press brake to be machined, the piston rod 2a of the hydraulic cylinder 2 has a plate-like shape.
A dog 4 is attached, and the ram 3 is fixed on the ram 3 side.
In addition to the provision of the inclination detection switch 5 operated by the dog 4 when the above-mentioned inclination occurs, the inclination detection switch 5
A press brake inclination detecting device which stops the operation of the press brake main body 1 in response to the detection signal.