JPS6138750Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a movable workpiece stopper device for stopping a part (workpiece) at a processing position in a press machine used when bending an automobile part (e.g. bonnet, etc.).

A conventional general press machine used for bending vehicle body parts such as automobile hoods into predetermined shapes is schematically shown in FIG. Let me explain this first. A workpiece 1 such as a bonnet slides down a guideway 3 that is integral with the press body toward a processing position at its downstream end. A stopper 9 is provided to stop the workpiece 1 at a processing position. When the workpiece 1 comes into contact with the stopper 9 and is stopped, the workpiece 1 is held by a pad (not shown) and preparation for machining is completed. Next, the machining cam 5 having the machining blade 7 moves in the direction of the arrow and is brought to the machining position, where the machining blade 7 bends the workpiece 1. At this time, stopper 9
Since this interferes with the machining cam 5, it is necessary to move the stopper 9 back from the machining position to a position where it does not interfere with the machining cam. For this purpose, the stopper 9 is of a movable type, and a dedicated cam (not shown) has conventionally been used as its driving source. That is, the stopper 9 can be moved up and down by a special cam that interlocks with the press die, so that the stopper is moved upwardly from the processing position each time processing is performed.
However, the conventional method of providing a dedicated cam just for driving the stopper 9 not only makes the entire structure of the press larger and more complicated, but also leads to a significant increase in manufacturing costs. It had been.

In order to satisfy these demands, the present invention simplifies the structure of the press machine by using the existing processing cam as a drive source for the stopper instead of providing a dedicated cam for the stopper, thereby overcoming the shortcomings of the conventional technology. The aim is to eliminate the

Description will be given below with reference to the accompanying drawings.

2 and 3 show an embodiment of the stopper device according to the present invention. Although not particularly shown in this figure, the workpiece 1 slides down on the guide path 3 toward the processing position similarly to FIG. 1. Note that in applying the present invention, the work 1 may be any part, and the guide path 3 is not limited to the type on which the work 1 simply slides as shown in the figure. Of course, a means of forcibly transferring may also be used.

The stopper device main body 11 is rotatably connected via a pivot pin 15 to a bracket 13 which is integrally held in a press main body (not shown). Main body 1
1 has a blind hole 17 into which a stopper arm 19 is slidably fitted. The stopper arm 19 has a long hole 23 formed in the peripheral wall of the blind hole 17 of the main body 11 and a pin 2 formed in the stopper arm 19.
1 and the long hole 2 in the blind hole 17 by the pin-long hole mechanism.
It is possible to reciprocate by a length of 3. A stopper plate 25 on which urethane 26 or the like is pasted is attached to the tip of the stopper arm 19 to reduce the impact when the workpiece 1 (FIG. 1) collides with the stopper plate 25. This shock reduction is also achieved by a shock absorbing spring 27 disposed within the blind hole 17. That is, the spring 27 is engaged with the rear end of the stopper arm 19 and absorbs the impact when the workpiece 1 collides with the stopper plate 25.

A cam engaging surface 12 is formed in the lower part of the main body 11, and the auxiliary cam 6 provided on the processing cam 5 is locked to this cam engaging surface 12. As is well known, the processing cam 5 itself is movably guided and held in the press body in the direction of arrow A, and is driven by an operating rod 51 fixed to the upper die 50 of the press. That is, when the upper mold 50 moves up and down (in the direction of arrow B), the cam action surface 5 of the actuating rod 51 moves up and down integrally with it.
2, the converted force is transmitted to the machining cam 5 in the direction of the arrow A, and the machining cam 5 is moved in the direction of the arrow A. When the machining cam 5 is moved forward toward the machining position in the direction of arrow A by the auxiliary cam 6, which moves from the two-dot chain line position 6' to the solid line position 6, the stopper body 11 rotates counterclockwise about the pin 15. is brought from the dashed-dot line position 11' to the solid line position 11. As a result, the stopper arm 19 and the stopper plate 25 are also located at the two-dot chain line position 19', respectively.
25' to solid line positions 19 and 25. In this way, the stopper device can move from the operating position where the stopper plate 25 enters the machining position to the retracted position where the stopper plate 25 does not prevent the machining cam 5 from entering the machining position. Return of the stopper device to its operating position is ensured by a return spring 31 provided between the stopper body 11 and the bracket 13.

When the stopper plate 25 is in the operating position (double-dashed line position 25'), the workpiece 1 is thrown into the processing position, collides with the lower end of the stopper plate 25, and is stopped at the processing position. Then, as the upper mold begins to descend, the stopper plate 25 begins to move toward the retracted position, but at this time, as described above, the workpiece 1 itself is held in place by a pad (not shown), so the stopper plate 25 Even if 25 comes off the workpiece, the workpiece 1 will not move. The lower end of the stopper plate 25 escapes above the machining blade 7 of the machining cam 5 in its retracted position.
When the auxiliary cam 6 completely rides over the cam engagement surface 12 of the stopper body and comes to the flat part 14 parallel to the processing cam 5, the stopper body 11 no longer rotates and the upper die 50 reaches its press dead center. It will remain stopped until

FIG. 4 shows a modified embodiment of FIG. 2. In the embodiment shown in FIG. 2, when the stopper plate 25 rotates toward the retracted position, it moves in an arc around the pin 15, so there is a possibility that the workpiece 1 will be pushed back, albeit slightly. In order to prevent this, the pivot pin 15a may be positioned below the lower end level l of the stopper plate 25, as shown in FIG. In this case, the shape of the stopper body 11a may also need to be slightly changed from the stopper body 11 shown in FIG. In the embodiment shown in FIG. 4, when the stopper plate 25 moves in an arc, it traces a locus in a direction away from the workpiece 1 as shown in the figure, so there is no possibility of pushing the workpiece 1 back.

As described above, according to the present invention, there is no need to provide a dedicated cam to drive the movable stopper, and the existing processed cam is also used as a drive device for the movable stopper, so the structure is simpler and smaller than the conventional technology. Not only is it possible to reduce the weight and cost, but also to reduce the weight and cost.

[Brief explanation of drawings]

FIG. 1 is a side view showing an example of the structure of a work stopper in a conventional press machine, FIG. 2 is a partially sectional side view of a work stopper device according to the present invention, and FIG.
This figure is a perspective view of the stopper body shown in FIG. 2, and FIG. 4 is a view showing a modification of FIG. 2. 1...Workpiece, 3...Traveling guide path, 5...Processing cam, 6...Auxiliary cam, 11...Stopper body,
19...Stotsupa arm.

Claims (1)

[Scope of utility model registration request] A guide path that brings the workpiece to a processing position located at the downstream exit end of the guide path, and an operating position and a processing position that are pivoted to the press body at a position opposite to the downstream exit end of the guide path and enter the processing position. It has a stopper that rotates between two positions, a retracted position and a retracted position, and a processing cam that is guided and held by the press body so as to be able to move forward and backward toward the processing position in order to perform predetermined processing on the workpiece. a stopper body that is locked to the processing cam and pivoted between the operating position and the processing position in conjunction with the movement of the processing cam, and a stopper body that is relative to the stopper body by a predetermined distance in the movement direction of the workpiece. It has a stopper arm that is movably attached to the stopper arm, and a buffer that absorbs the impact when a work collides with the stopper arm, and the stopper gradually retreats to the retracted position as the processing cam moves forward to the processing position. A movable workpiece stopper device for a press machine, characterized in that it can be completely removed from a workpiece when processing a pressed workpiece.