JPH022505Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a device for adjusting the clamp stroke and inner width of a feed bar in a transfer press.

(Prior Art) Conventionally, in a transfer press, a device for clamping and unclamping a feed bar has a rod that moves up and down driven by a cam attached to a press slide, and a rack and pinion mechanism that controls the up and down movement of the rod. In other words, the structure was constructed such that the movement is converted into a clamp/unclamp movement in a direction perpendicular to the length of the feed bar through the feed bar.

In the method using a cam in which the drive source for clamping motion is provided on the press slide, the cam itself must be replaced in order to change the clamp stroke, and therefore the stroke is fixed.

The configuration in which the clamping movement of the feed bar is performed in conjunction with the cam of the slide has the advantage that the timing of the clamping and unclamping movements can be easily matched, and there is no need to provide a special cam mechanism, which can be said to be advantageous in terms of space. are doing.

However, in molds that handle relatively large workpieces, mold accessories such as guide posts that guide the upper and lower molds become larger, so the workpiece holding fingers provided on the feed bar interfere with these parts. It is necessary to provide a large release to prevent this from occurring, and for this purpose it is necessary to increase the stroke length of the clamp/unclamp of the feed bar. However, even when handling relatively small workpieces, it is unreasonable to increase the stroke length because the inertial force increases and speeding up cannot be expected.
Therefore, it has been desired to make the clamp/unclamp stroke length variable.

(Problems to be solved by the invention) The present invention was made to solve the problems of the conventional technology, and although it is a mechanism that obtains the drive source for the clamping movement of the feed bar from the press slide, the clamping stroke can be changed and adjusted. It is an object of the present invention to provide a device which is capable of adjusting the inner width of the feed bar.

(Means for Solving the Problems) In order to achieve the above object, the present invention includes a vertical rod that reciprocates in conjunction with the drive shaft of the press, a pinion that meshes with the rack of the vertical rod, and a pinion that engages with the rack of the vertical rod. an eccentric disk provided integrally; a screw shaft provided on the eccentric disk in a direction perpendicular to the rotation center of the eccentric disk; a rotational drive mechanism for the screw shaft; a slider screwed to the screw shaft; The horizontal shaft is connected to the eccentric part of the outer casing of the differential type reducer, and the output shaft is decelerated and rotated when the outer casing is rotated. The gist is that the output shaft of the differential type reducer is connected to a second pinion that meshes with a second rack provided on a pair of mounted feed bar receivers, and that both output shafts are provided with a rotational drive mechanism. It is something.

(Embodiment) FIG. 1 is a cross-sectional view of the adjusting device of the present invention, and FIG. 2 schematically shows the clamp movement mechanism of the feed bar.

In Fig. 1, gear box 2 installed on press frame 1.
A vertical rod 3 that moves up and down in synchronization with the press slide is provided vertically passing through the press slide, and the vertical rod 3 constitutes a rack 4 within the gear box 2.
The pinion 5 meshed with the rack 4 is mounted on the gear box 2 with sleeves 6, 6 formed at the front and rear along the rotation axis, and is connected to an eccentric disk 7 provided on the outside of the front of the gear box 2. ing. When the vertical rod 3 reciprocates, the pinion 5 rotates in forward and reverse directions, and at the same time, the eccentric disc 7 rotates in forward and reverse directions.

The eccentric disk 7 is provided with a threaded shaft 8 extending in a direction perpendicular to the rotational shaft of the pinion 5, and a bevel gear 9 provided on the threaded shaft 8 is a bevel gear 9 provided on the rotary drive shaft 10 inserted into the sleeve 6. The screw shaft 8 is meshed with a gear 11, and the rotation of the rotary drive shaft 10 causes the screw shaft 8 to rotate. The rotary drive shaft 10 is dynamically connected to a motor 10a for stroke adjustment (FIG. 2). Further, a slider 1 is attached to the screw shaft 8.
2 are screwed together, and the slider 12 is slidable along the screw shaft 8. Furthermore, the slider 12 is mounted on the eccentric disk 7 so as to slide along the screw shaft 8 without rotating along with the rotation of the screw shaft 8.

A connecting plate 14 is provided on the slider 12 by a pin 13, and the horizontal shaft 15 that reciprocates is provided at the tip of the connecting plate 14. Then, the reciprocating movement of the horizontal shaft 15 is used to perform clamp/unclamp movements of the feed bar.

As described above, when the eccentric disc 7 is rotated via the pinion 5 by the movement of the vertical rod 3, the distance r between the center of the rotary drive shaft 10 and the center of the pin 13 of the slider 12 becomes the amount of eccentricity of the crank. Connecting plate 14
swings, causing the horizontal shaft 15 to reciprocate.

The horizontal shaft 15 is provided with another horizontal shaft (not shown) using a rack and pinion mechanism, and these shafts can be reciprocated in opposite directions.If a feed bar is provided on this, the vertical rod 3
The reciprocating motion allows the feed bar to move in the clamping/unclamping direction.

To adjust the clamp stroke of the feed bar, the rotary drive shaft 10 is rotated to rotate the screw shaft 8, and the slider 12 screwed to the screw shaft 8 is moved forward and backward along the screw shaft 8.
By changing the position of the crank eccentricity r
is changed, the reciprocating distance of the horizontal shaft 15 is changed, and the clamp stroke is adjusted.

Next, the mechanism by which the movement of the press slide is transmitted to the feed bar will be explained with reference to FIG. A cam 20 provided on the slide is in contact with a cam follower of a lever 21 connected to the upper end of the vertical rod 3, and a lower end of the vertical rod 3 is connected to an air cylinder 22 which serves to press the cam follower into contact with the cam 20. ing. The horizontal shaft 15 is a differential speed reducer 23 (preferably one commercially available under the trademark Harmonic Drive), a circular spline 24,
It is formed into a circular spline 24 consisting of a flex spline 25 and a wave generator 26, and by fixing any one member, deceleration or speed increase is performed between the other two members. A second pinion 27 is provided at one end of a shaft that is pivotally attached to the outer casing eccentric portion 24a and protrudes from the flexspline 25 of the reduction gear 23. Further, second racks 28, 28 are engaged with the second pinion 27, and feed bar receivers 29, 2 provided on the second racks 28, 28 are engaged with the second pinion 27.
9, feed bars 30, 30 are slidably mounted.

A shaft of the differential speed reducer 23 that projects from the wave generator 26 is connected to a drive shaft 32 via a bevel gear 31. The drive shaft 32 is dynamically connected to a motor 33 for adjusting the inner width of the feed bar.

Due to the reciprocating movement of the horizontal shaft 15, the speed reducer 2
The circular spline shaft 24 is rotated forward and backward by swinging the outer casing eccentric part 24a of No. 3, and the feed bars 30, 30 are clamped/unclamped via the second pinion 27 and the second racks 28, 28. let And in the same figure, the circular spline 24
Drive the motor 33 with the drive shaft 3 fixed.
2 and rotates the wave generator 26, the flexspline 25 is output and rotates the second pinion 27, which causes the feed bar 3 to rotate independently of the vertical rod 3 that synchronizes with the press slide.
0,30 can be moved toward or away from each other, thereby changing the internal width of the feed bar.

(Effects of the invention) This invention is a mechanism for clamping and unclamping the transfer feed bar in synchronization with the press slide. A slider that can change the feed bar is provided, and a horizontal shaft that drives the feed bar is connected to this slider.By simply changing the position of the slider, the reciprocating distance of the horizontal shaft can be changed, thereby adjusting the clamp stroke. As a result, the number of types of workpieces that can be handled by the press increases and the press can be used more frequently.

Further, a second pinion is connected to the eccentric portion of the outer casing of the differential type reducer in which the output shaft rotates at a reduced speed when the outer casing is rotated, and the second pinion meshes with the output shaft with a second rack. and a feed bar receiver is provided on the second rack, so that by rotating only the output shaft of the differential type reducer, the feed bar can be approached and separated independently of the drive source of the press. This has the effect of allowing the inner width of the feed bar to be adjusted.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of the adjusting device of the present invention;
The figure is an explanatory diagram schematically showing the clamp movement mechanism of the feed bar. 1...Press frame, 2...Gear box, 3...
Vertical rod, 4...Rack, 5...Pinion, 6...
...Sleeve, 7...Eccentric disc, 8...Screw shaft, 9...
...Bevel gear, 10...Rotation drive shaft, 11...Bevel gear, 12...Slider, 13...Pin, 14...
Connection plate, 15...horizontal shaft, 20...clamp cam,
21...Lever, 22...Air cylinder, 23...
... Differential type reduction gear, 24 ... Circular spline, 25 ... Flex spline, 26 ... Wave generator, 27 ... Second pinion, 2
8...Second rack, 29...Feed bar receiver,
30...Feed bar, 31...Bevel gear, 32...
...Drive shaft, 33...Motor.

Claims (1)

[Scope of utility model registration request] A vertical rod that reciprocates in conjunction with the drive shaft of the press, a pinion that meshes with the rack of the vertical rod, an eccentric disc that is integrated with the pinion, and a The screw shaft is provided in a direction orthogonal to the screw shaft, a rotation drive mechanism for the screw shaft, a slider screwed to the screw shaft, and a horizontal shaft connected to the slider, and when the outer casing is rotated, the output shaft is decelerated. The horizontal shaft is connected to the eccentric portion of the outer casing of the differential type reducer that rotates, and the second pinion meshes with a second rack provided on a pair of feed bar receivers to which the feed bar is slidably mounted. An apparatus for adjusting the clamp stroke and inner width of a feed bar in a transfer press, characterized in that an output shaft of the differential type reducer is connected to the output shaft, and a rotational drive mechanism is provided on the output shaft.