JPS588926B2 - Feed bar balance device in 3D transfer press - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a balance device for a feed bar in a three-dimensional transfer press.

In a three-dimensional transfer press, when the feed bar itself moves in three dimensions, the feed bar, the fingers, and the product gripped by the fingers must be moved up and down.

Therefore, when operating at high speed or increasing the size of the device, the force applied to the lift device is the sum of the weight and the acceleration/deceleration force, so the lift device must also be increased in size.

Furthermore, as the lift device becomes larger, it becomes difficult to exercise.

The present invention was invented to eliminate these conventional drawbacks, and by incorporating a biasing means at the lower end of the lift device to balance the weight of the entire lift device, the force applied to the lift device is reduced to acceleration/deceleration force. It is an object of the present invention to provide a transfer press that can be operated at high speed because the weight applied to the lift device can be reduced to zero and stable movement of the lift device can be obtained.

The invention will now be described in detail with reference to illustrative embodiments.

The feed bars 1, 1 are two parallel rods, and are provided with fingers (not shown) on the opposing inner sides, and perform two-dimensional movements such as clamping, unclamping, advance, and return movements, as well as lift and down movements. Perform the added three-dimensional movement.

FIG. 1 shows a device that performs clamping and unclamping movements, as well as lifting and down movements.

The feed bars 1, 1 are mounted on feed bar receivers 2, 2, and the feed bars 1, 1 can freely slide in a direction parallel to the longitudinal force direction.

Lift plates 3, 3 are provided at the lower ends of the feed bar receivers 2, 2, and these lift plates are accommodated in housings 4, 4.

The housings 4, 4 are located in an operating unit 5 fixed to the press machine, and the housings 4, 4 are movable in a direction perpendicular to the longitudinal direction of the feeders 1, 1.
, 4 are provided with four wheels 6, 6.
are placed on rails 7, 7 formed on the inner wall of the operating unit 5, so that the housings 4, 4 can move toward or away from each other.

A biasing means is provided at the lower end of the housing 4 to balance the weight of the lift device.

In this embodiment, the housing 4 is formed into a cylindrical shape, and the lift plate 3 protrudes from the upper end opening, and the lower end is formed into an air cylinder 8.
An air chamber 9 having a larger diameter is connected to the air chamber 9.

A piston 10 provided at the lower end of the lift plate 3 is accommodated in the air cylinder 8 to maintain a balance between the pressure in the air chamber 9 and the pressure applied to the lift plate 3.

The housing 4 has a crankshaft 11 projecting from both sides of the housing in a direction perpendicular to the feed bars 1, 1.
is installed, and a crank part 11a is installed in a long hole 12 bored in the lift plate 3, and a crank shaft 110 is installed.
The rotation moves the lift plate 3 in the vertical direction.

Further, a drive shaft 13 is connected to the crankshaft 11 of one of the housings 4 (on the right side), passing through the operation unit 5 and extending outward from the operation unit 5.

Furthermore, spline shafts 14 and 14 facing in opposite directions are attached to the crankshaft 11 of the housing 4 and the other housing 4 (on the left side), and a connecting tube 16 that is loosely inserted into a bearing 15 provided in the center of the operating unit 5 is attached to the crankshaft 11 of the housing 4 on the left side. They are connected so that they can move freely only in the axial direction.

In addition, wheels 6 on the inner sides of the housings 4 and 40 facing each other
, 6 are provided with ranks 17.17 facing the bearing 15, and the racks 17, 17 mesh with a pinion 19 mounted on the bearing 15 by a shaft 18 so as to move in opposite directions. It has been done.

The present invention has the above configuration, and the rings 4, 4 are connected to each other by the ranks 17, 17 around the pinion 19 in such a manner that they approach and move away from each other. Therefore, when the drive shaft 13 is moved in the axial direction, the housings 4, 4 Clamping and unclamping movements are performed on the feed pars 1 and 1 connected to the feed pars 1 and 1.

Further, when the drive shaft 13 is rotated, the lift plates 3, 3 are raised and lowered by the crankshafts 11, 11, which rotate together with the drive shaft 13, thereby causing the feed bar to perform lift and down movements.

Although the housings 4, 4 move toward and away from each other as described above, the ends of the spline shafts 14, 140 provided in opposite directions of the housings 4, 4 are screwed into the connecting tube 16, so that the housings 4, 4 cannot be clamped or unfastened. During clamping motion, the spline shafts 14, 14 are freely inserted and removed, and when one spline shaft rotates, the rotation is transmitted to the other spline shaft via the connecting tube 16.

Therefore, the lifting and down movements and the clamping and unclamping movements of the feed bars 1, 1 are performed by the rotation and reciprocating movement of the drive shaft 13.

In the present invention, a balance mechanism is provided in the lift device for the feed bar, and an air cylinder 8 is provided at the lower end of the housings 4, 4 as a biasing means to balance the total weight of the lift device. Air pressure is supplied to the air chamber 9 connected to the lift device to balance the weight of the entire lift device.

When a lift movement is performed in this state, the force applied to the lift device is only acceleration/deceleration force, the weight of the lift device can be ignored, stable movement is obtained, and the press can be operated at high speed.

Furthermore, since the air cylinder 8 has an air chamber 9 with a diameter larger than the diameter of the cylinder at the opening, it is possible to shorten the overall length of the air cylinder 8, which allows the cylinder to protrude from the operation unit 5. This allows the overall shape to be made smaller.

As explained above, in the present invention, the biasing means for balancing the weight of the lift device is provided at the lower end of the housing that supports the feed bar.
Since the overall balance can be maintained by balancing the part that directly drives the lowering, the balance device can be made compact and stored in the operating unit.

[Brief Description of the Drawings] Figure 1 is an overall front view of the assembled balance device of the feed bar, with a portion cut vertically, Figure 2 is a front view of the vertical cross section showing details of one lift plate portion of the balance device, and Figure 3 is a side view of the lift plate. 1...Feed bar, 2...Feed bar holder, total...Lift plate, 4...Housing, 5...Operation unit, 6... ...Wheel, 7...Rail, 8...Air cylinder, 9...Air chamber, 10...Piston, 11...・Crankshaft, 12... Long hole, 13... Drive shaft, 14... Spline shaft, 15... Bearing, 16... Connection tube, 17...Rack, 18...Shaft, 19
...Pinion.

Claims (1)

[Scope of Claims] 1. A feed bar holder that performs clamping, unclamping, lifting, and down movements of the feed bar, and on which the feed bar is placed so that it can freely slide in the longitudinal direction; and a lift connected to the lower end of the feed bar holder. A lift plate elevating mechanism that lifts and lowers the feed bar holder together with the lift plate by installing the crank part of the crankshaft in the long hole of the plate, and a lift plate lifting mechanism that is installed at the lower end of the lift plate and uses pressure to balance the weight of the lift mechanism. A balance device for a feed bar in a three-dimensional transfer press, comprising: biasing means for biasing a lift plate upward; 2. A balance device for a feed bar in a three-dimensional transfer press according to claim 1, wherein the biasing means is an air cylinder formed in a housing that supports a feed bar holder.