JPH08269B2 - Blank feeding device for press machine - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blank feeding device for a press machine.

[0002]

2. Description of the Related Art In a press machine, especially a transfer press machine, several press steps starting from a punching step are successively carried out on a sheet-shaped material sent. Therefore, the pressed product processed in each process is sent out toward the next process position. in this case,
It is common to use pusher bars to deliver the plate blank obtained by first stamping the material to the next process position.

8 to 10 show a conventional pusher bar 80.
This is provided with a pair of legs 81 and 82 that are U-shaped when viewed from the top, and a drive rod 83 is connected to the base portion thereof. The pusher bar 80 is initially located below the die, and the blank M punched by the punch and the die is dropped by knocking out so that it is placed over both legs 81 and 82.

Then, the pusher bar 80 moves leftward to the left while the blank M is lightly pressed by the knockout. The pressed blank M holds its position by the stopper 84 for detent, and when the tip of the pusher bar 80 moves backward until it goes beyond the left side surface of the blank M, the blank M moves to the legs 81, 82 of the pusher bar. Fall from above.

After that, the pusher bar 80 starts to move forward and pushes the left side surface of the blank M with its tip. By now, the knockout has risen and the pressing of the blank M has been released.
Are extruded and sent to the next step.

In the step of sending out the blank M using such a pusher bar, if the blank M has a circular shape, there is no particular problem, but if it has a non-circular shape, a problem occurs. That is, the blank M that has dropped onto the pusher bar 80 is in a state of straddling the legs 81 and 82, and the middle of the blank M is pressed down by a knockout.

Therefore, if there is a difference in the contact area between each leg 81, 82 and the blank M, when the pusher bar M retracts, a difference in the contact resistance occurs due to the difference in the contact area, and the part is pressed down by the knockout. Rotate in either direction to the left or right. This rotation causes the posture of the pusher bar to change from when it first dropped. In addition, the tips of the legs 81 and 82 are blank M
When retreating to over the distance, the blank M has legs 81 and 82.
Although the blank M falls more naturally, the posture of the blank M may collapse during the dropping process.

Assuming that the posture is changed and sent to the next process position, for example, when the die cutting press is performed in the next process, the die cutting position and the blank M are removed.
The relative positional relationship with and will change, and accurate die cutting will not be possible.

[0009]

SUMMARY OF THE INVENTION It is an object of the present invention to prevent the blank posture from changing when a punched blank is fed by a pusher bar.

[0010]

According to the present invention, a pusher bar is provided with a central leg and a tripod consisting of a pair of side legs on both sides of the central leg, and the pusher bar is punched by a press machine on opposite sides of the both legs. A blank that has a step over which the blank spans, and the surface of the center leg is formed higher than the step so that the blank that spans the step rests away from the step, and the tip of each leg has slipped out of both legs. It is characterized in that it is provided with a leaf spring for holding the.

[0011]

The blank punched out by the punch and die is knocked out so as to straddle the steps of both legs. The dropped blank rests on the surface of the central leg, but since the surface of the central leg is higher than the step surface of the step, the blank is slightly separated from the step surface.

Then, the pusher bar moves backward so that the center of the blank is lightly pressed against the surface of the center leg by knocking out. The pressed blank keeps its position, and the tip of the pusher bar retreats until it exceeds the blank.However, since the center of the blank is pressed and it is free from the step, the pusher bar The blank only slides on the surface of the center leg even when it is moved, and its posture does not change.

When the tip of each leg of the pusher bar is retracted until it separates from the blank, the blank is pinched by the leaf springs at the tips of the side legs. Therefore, even in this case, the blank does not lose its posture. After this, the pusher bar starts to move forward, and the blank is sent out as it is. By that time, the knockout has risen to release the pressing of the blank, so the blank is extruded by the pusher bar and sent to the next step.

[0014]

Embodiments of the present invention will be described with reference to the drawings. FIG.
4 shows a pusher bar 1 according to the invention, which comprises a pair of side legs 2, 3 and a central leg 4. A drive rod 5 is connected to the base end, and is moved left and right along the length direction by a required drive source. Steps 6 and 7 on which the blanks straddle are provided on the opposite side surfaces of each side leg 2 and 3.

A blank extending over the surface of the central leg 4 over the step portions 6 and 7 is formed to be higher than the step surfaces of the step portions 6 and 7 so as to be placed apart from the step surfaces. Further, leaf springs 8 and 9 for holding the blank pulled out from the both legs are provided at the tips of the both legs 2 and 3.

FIG. 5 shows a transfer press machine. 1
Reference numeral 0 denotes a base, on the surface of which a sheet-shaped material is sent in a direction orthogonal to the paper surface. Die 1 on base 10
1 is attached. A pusher bar 1 is movably installed below the base 10. A punch 12 is attached to a vertically moving press ram 13. 14 is a knockout penetrating the center of the punch 12, and 15 is a stripper.

When the press ram 13 is lowered, the punch 12 is moved.
When blank is punched out from the material, the blank M
Fall on the surface of the pusher bar 1. The blank on the surface of the pusher bar 1 at this time is designated as M1 in FIG. As shown in FIG. 4, the blank M1 straddles the step portions 6 and 7 of the side legs 2 and 3, but is placed so as to be in direct contact with the surface of the central leg 4. Therefore, a gap d is formed between the blank M1 and the step surfaces of the step portions 6 and 7. The state of the press machine at this time is shown in FIG.

In this state, the pusher bar 1 is retracted. In this case, the lower end of the knockout 14 presses the center of the blank M1 against the surface of the central leg 4 by an elastic force or a proper weight, and a detent stopper 16 is provided.
By being blocked by, the busher bar 1 only retracts, and the blank M1 continues to maintain its position, so its posture does not collapse.

When the pusher bar 1 is retracted until it is separated from the blank, the blank having a relative positional relationship with the busher bar 1 at that position is designated as M2, which is shown in FIG. When the pusher bar 1 is retracted to the above-mentioned position, the blank M2 is held by the leaf springs 8 and 9 as shown in the figure while keeping the posture when it is placed on the surface of the central leg 4. After that, the press ram 13 rises,
Along with this, the knockout 14 also rises and the blank M
Move away from surface 2. FIG. 6 shows the state of the press machine at this time.

The pusher bar 1 is then fitted with leaf springs 8, 9
The blank M2 is moved forward while being held, and when the blank M2 reaches the next process position, the advance is stopped. The state of the press machine at this time is shown in FIG. At this position, the blank M2 is taken out from the leaf springs 8 and 9 by an appropriate jig, and the next step is started.

[0021]

As described above, according to the present invention, when the punched blank is sent out by the pusher bar to be transferred to the next step, it is possible to reliably send out the blank without breaking the posture of the blank. Play.

[Brief description of drawings]

FIG. 1 is a plan view of a pusher bar of the present invention.

FIG. 2 is a cross-sectional view of FIG.

FIG. 3 is a front view of FIG.

FIG. 4 is an enlarged view of a part of FIG.

FIG. 5 is a front view of the press machine with a blank punched out.

FIG. 6 is a front view of the press machine with the press ram raised.

FIG. 7 is a front view of the press machine in a state where a blank is delivered.

FIG. 8 is a plan view of a conventional pusher bar.

9 is a cross-sectional view of FIG.

FIG. 10 is a front view of FIG.

[Explanation of symbols]

 1 pusher bar 2 side leg 3 side leg 4 center leg 6 step 7 step 8 leaf spring 9 leaf spring M blank

Claims (1)

[Claims] 1. A pusher bar is provided with a central leg and a tripod consisting of a pair of side legs on both sides thereof, and a stepped portion on which the blank punched out by a pressing machine straddles the opposite side faces of the both side legs. And the surface of the central leg is formed higher than the stepped surface so that the blank straddling the stepped portion can be placed away from the stepped surface. A blank feeding device for a press machine, which is provided with a leaf spring that holds a blank.