JPH0753770Y2 - Press brake stopper device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a stopper device for setting a lower limit of a press brake.

[Conventional technology]

Fig. 3 shows a general small press brake.
The upper die 3 is lowered with respect to the lower die (die) 2 installed on the bed 1, and a plate material (not shown) placed on the lower die 2 is bent. The upper die 3 is connected to the ram 5 of the ram device 4 shown in FIG. 4 via the slide 5a.

In the stopper device of the conventional press brake, a cylindrical stopper 9 having a stopper surface 8 facing the lower surface of the piston 6 of the ram 5 is slidably and rotationally engaged in the cylinder 7 of the ram device 4. Have been fitted. A screw 10 is provided on the outer circumference of the stopper 9, and the screw 10
The inner diameter portion of the worm gear 12 of the worm gear device 11 is screwed into. The lower surface of the worm gear 12 is in contact with and supported by a fixing member 13 fixed to the cylinder 7.

In this conventional stopper device, however, the ram 5 moves downward and the piston 6 comes into contact with the stopper surface 8 of the stopper 9 to reach the lower limit.

Then, the worm 14 meshing with the worm gear 12 is rotated by a handle (not shown) to rotate the worm gear 12, whereby the stopper 9 is vertically moved via the screw 10 to adjust the lowering limit. . At this time, the force acting on the stopper 9 is supported by the fixing member 13 via the worm gear 12.

[Problems to be solved by the device]

Generally, in a press brake, before the trial bending, the lower limit position of the upper die 3 is calculated or predicted from the shape of the lower die 2 and the plate thickness of the work, and the stroke is provisionally set, and the trial bending is performed by this. The position of the stopper 9 is finely adjusted based on the result.

However, in the above-mentioned conventional stopper device, since the lower side surface of the worm gear 12 for moving the stopper 9 up and down directly abuts on the fixing member 13, the friction coefficient between them is large, and thus the ram 5 has a large friction coefficient. This worm gear at the lower limit 12
The worm gear 12 could not be manually rotated when a force was applied to the ram 5, and stroke adjustment at the lower limit of the ram 5 could not be performed.

For this reason, the fine adjustment of the stopper 9 must be performed by slightly raising the ram 5, and the fine adjustment cannot be accurately performed once. Therefore, it takes time to adjust the stopper by trial bending and The work was also difficult to do.

The present invention has been made in view of the above, and it is possible to manually adjust the lower limit of the ram downward even when the ram lower limit, that is, the state where the force is applied to the stopper, is set. An object of the present invention is to provide a stopper device for a press brake in which the lower limit of the ram can be adjusted in an operating state by trial bending, and this adjustment can be extremely easily performed during one trial bending. is there.

[Means for Solving the Problems]

In order to achieve the above object, a stopper device of a press brake according to the present invention connects an upper die to a ram of a ram device through a slide, and faces a lower surface of a piston of the ram in a cylinder of the ram device. A cylindrical stopper having a stopper surface that is provided with a screw on the outer peripheral surface is slidably fitted in the axial direction, and the inner diameter of the worm gear of the worm gear device is screwed into the screw of this stopper. In the stopper device of the press brake in which the worm gear is rotated to move the stopper in the axial direction through the screw to adjust the lower limit of the ram, the worm gear and the axial lower side thereof are supported. The thrust bearing is interposed between the fixed bearing and the fixed member.

[Action]

Since the worm gear is supported by the fixed member via the thrust bearing, even if a downward force is applied to the worm gear, the worm gear can be easily rotated, so that the ram device is in the lower limit state. The lower limit of this can be easily adjusted downward.

〔Example〕

An embodiment of the present invention will be described with reference to FIG. In this embodiment, the same components as those of the conventional example shown in FIG. 4 are designated by the same reference numerals, and the description thereof will be omitted.

Worm gear 12 screwed onto the outer periphery of stopper 9 and fixing member
A thrust bearing 15 is provided between the thrust bearing 15 and the bearing 13.

Then, when the ram 5 moves downward and the piston 6 abuts on the stopper 9 and the ram 5 stops at the lower limit, the pressing force by the ram 5 is passed through the stopper 9, the worm gear 12, and the thrust bearing 15. It is received by the fixing member 13.

At this time, since the thrust bearing 15 is interposed between the worm gear 12 and the fixing member 13, the worm gear 12 is fixed to the fixing member 13 even if the pushing down force acts between them.
Can be easily rotated against.

Therefore, even when the ram 5 is lowered to the lower limit and the hydraulic pressure acts in the lower direction, the worm gear 12 can be rotated with a small rotational force in the direction in which the stopper 9 is lowered to adjust the lower limit to the lower side. it can.

In addition, the worm gear 12 and the worm 14 screwed onto the worm gear 12
A worm gear device 11 composed of and is constructed as shown in FIG. 2, and the worm shaft 16 includes pulleys 20, 2 attached to a handle shaft 19 supported on a side surface of a frame 17 through a bracket 18.
1, the belt is connected via a belt 22, and when the handle shaft 19 is rotated by the handle 23, the worm shaft 19 is rotated and the worm gear device 11 is operated. 24 is a tension pulley.

[Effect of device]

According to the present invention, the worm gear 12 is rotated to move the stopper 9 downward even when the ram 5 is at the lower limit, that is, even when the ram 5 is in contact with the stopper 9 and a force is applied to the stopper 9. It is possible to manually adjust the lower limit of the ram 5 to the lower side. Therefore, the lower limit of the ram 5 can be adjusted in the operation state by the trial bending, and this adjustment is extremely easy in one trial bending. Can be done.

[Brief description of drawings]

1 and 2 show an embodiment of the present invention. FIG. 1 is a longitudinal sectional view of an essential part, and FIG. 2 is a structural explanatory view showing a drive mechanism of a worm gear device. FIG. 3 is a front view of the press brake, and FIG. 4 is a vertical sectional view showing a main part of a conventional example. 3 is an upper die, 4 is a ram device, 5 is a ram, 5a is a slide, 6
Is a piston, 7 is a cylinder, 8 is a stopper surface, 9 is a stopper, 10 is a screw, 11 is a worm gear device, 12 is a worm gear, 13 is a fixing member, 14 is a worm, and 15 is a thrust bearing.

Claims (1)

[Scope of utility model registration request] 1. An upper die 3 is connected to a ram 5 of a ram device 4 via a slide 5a, and in a cylinder 7 of the ram device 4,
A cylindrical stopper 9 having a stopper surface 8 facing the lower surface of the piston 6 of the ram 5 and provided with a screw 10 on the outer peripheral surface is slidably fitted in the axial direction. Screw the inner diameter of the worm gear 12 of the worm gear device 11
In the stopper device of the press brake, which rotates the worm gear 12 to move the stopper 9 in the axial direction via the screw 10 to adjust the lower limit of the ram 5, the worm gear 12 and the shaft thereof. A stopper device for a press brake, characterized in that a thrust bearing (15) is interposed between a thrust bearing (15) and a fixing member (13) supporting the lower side in the direction.