Electrically driven mechanical servo press machine

Abstract

An electrically driven mechanical servo press machine including a brake and a clutch is arranged such that a motor shaft of a servomotor is connected to a drive shaft or a sleeve of the mechanical servo press machine on a clutch side. With this arrangement, safety in control can be improved.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a sectional view showing a drive portion of an electrically driven mechanical servo press machine of an example of the present invention;

FIG. 2 is a conceptual view showing a drive portion of an electrically driven mechanical servo press machine of a modification of the present invention;

FIG. 3 is a conceptual view showing a drive portion of an electrically driven mechanical servo press machine of a modification of the present invention likewise; and

FIG. 4 is a sectional view showing a drive portion of a mechanical press machine of a conventional example.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

According to the present invention, there can be realized a servo press machine with high safety in which not only any arbitrary slide motion suitable for the processing conditions of a work can be realized by using a servomotor but also the press machine can be stopped, when an abnormal state occurs, by shutting off power at once and actuating a brake by providing the press machine with a clutch and the brake similar to those of a conventional mechanical press machine regardless that it is driven by a servomotor.

EXAMPLE

An example of the present invention will be explained referring to the drawings. FIG. 1 is a sectional view showing a drive portion of an electrically driven mechanical servo press machine of the example, wherein reference numeral 7 denotes a servomotor, 71 denotes a motor shaft, and 711 denotes a sleeve attached to the motor shaft 71 by a spline and the like, in addition to the components used above in FIG. 4. A yoke 212 to be connected to a first outer ring 41 is formed integrally with the sleeve 711.

The press machine includes a brake and a clutch likewise the conventional mechanical press machine shown in FIG. 4 and has the servomotor 7 directly attached thereto in place of the flywheel 211 in the conventional mechanical press machine shown in FIG. 4.

Not shown 2 encoders are attached to each of a crank shaft of the press machine and a motor shaft of the servomotor 7, and the position of a slide and the motion of the servomotor are monitored by these encoders. In a normal operating state in which no abnormal function are detected as a result of comparison of the position of the slide with the motion of the servomotor, since compressed air acts on a piston 61 and a shifter 63 overcomes a spring 65 and pushed in a right direction in FIG. 1, friction plates 51 are pressed and friction plates 52 are released. That is, the clutch is connected, and the brake does not work.

When any abnormal function is detected, since compressed air is discharged and the piston 61 is pushed in a left direction by the spring 65, the clutch is disconnected and the brake works. Although this operation is all the same as that of the conventional mechanical press machine, since the clutch is disconnected, the press machine can be easily stopped even by an ordinary brake capacity.

The press machine shown in FIG. 1 is provided with a clutch 51 and a brake 52 called a “combination type” and disposed side by side and the servomotor is directly coupled with an input shaft. However, as shown in, for example, FIG. 2, when power is transmitted by a belt mechanism composed of pulleys 81 and 82 and a timing belt 83, maintenance and the like of the servomotor can be easily carried out.

Further, in a large press machine and the like, although a clutch 51 and a brake 52 are disposed separately on the opposite sides across a pinion 221 as a separate type, the present invention can be applied to both types.

Although it is needless to say that the electrically driven mechanical servo press machine of the present invention may be manufactured newly, it can be easily realized by reforming an existing mechanical press machine as well.

Claims

1. An electrically driven mechanical servo press machine comprising a brake and a clutch, wherein a motor shaft of a servomotor is connected to a drive shaft or a sleeve of the mechanical servo press machine on a clutch side.

2. An electrically driven mechanical servo press machine according to claim 1, wherein the servomotor is connected to the drive shaft or the sleeve through a belt mechanism.