JPH0233944Y2 - - Google Patents

Description

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

(Prior Art) In a transfer press, it is necessary to sequentially convey the processed material to the mold in accordance with the timing of the press, and devices that drive a feed bar in conjunction with the movement of a press slide are known.

In the prior art, there are devices in which the clamp stroke length and lift stroke length of the feed bar cannot be adjusted, and devices in which these stroke lengths are adjustable. Generally, the clamp unit is equipped with a built-in rod and feed bar drive device that moves up and down in conjunction with a cam provided on the slide.
The vertical movement of the rod drives a mechanism within the clamp unit to cause the feed bar to perform clamp/unclamp movements and lift/down movements.

In the former prior art, in order to change the clamp stroke length and lift stroke length of the feed bar, the height of the rod drive cam provided on the slide must be changed or the clamp drive mechanism must be changed, which is a substantial problem. Once manufactured, the stroke length could not be changed.

Furthermore, the latter type of conventional technology with adjustable stroke length usually has a structure in which the fulcrum position of the lever is changed, but when the fulcrum position changes, the swinging ends of the lever change on both sides, and this For,
For example, each time you change the clamp stroke length, both the clamp end position and unclamp end position change, so you must adjust the inner width of the feed bar at the same time as adjusting the stroke length of the feed bar. In the case of manual operation, the adjustment work becomes complicated, and in the case of automatic adjustment, the program becomes complicated.

(Problems to be Solved by the Invention) The present invention is capable of adjusting the clamp stroke and lift stroke of the feed bar without changing the inner width of the feed bar when adjusting the clamp stroke, and without changing the feed line of the feed bar when adjusting the lift stroke. An object of the present invention is to provide an adjusting device that can adjust the stroke length of each stroke.

(Means for solving the problem) The means for solving the problem in this invention are as follows:
A lever having a cam follower at one end, a rod connected to the other end, and a long hole formed in the center, a fulcrum bearing slidably housed in the long hole of the lever, and one end serving as a rotation fulcrum. an adjustment unit having a pivotably supported tip with its tip facing the fulcrum bearing and having the portion pivoted to the fulcrum bearing; and an adjustment shaft that moves forward and backward in the axial direction and connecting the adjustment shaft and the tip of the link; The long hole of the lever is formed in an arc shape that matches the trajectory of the fulcrum bearing and the connecting pin of the link when the link rotates at one of the swing limits of the lever, and the rod is Clamp and lift stroke of a feed bar, characterized in that the tip is connected to a mechanism that moves the feed bar in clamp/unclamp motion or lift/down motion, and the cam follower of the lever is joined to a cam that rotates in conjunction with the crankshaft. Adjustment device.

(Function) The rotation of the cam 14 causes the lever 10 to move to the fulcrum bearing 1.
6 and moves the rod 8 up and down, causing the feed bar to perform clamp/unclamp motion or lift/down motion via a mechanism within the clamp unit.

When adjusting the stroke of the feed bar,
The position of the fulcrum bearing 16 of the lever 10 is moved along the elongated hole 20 to change the stroke of the vertical movement of the rod 8, and accordingly the stroke length of the feed bar is changed and adjusted.

(Example) FIG. 1 is an overall view of the transfer mechanism, and FIG. 2 is a detailed view of the stroke adjustment section.

The mechanism on the left in Figure 1 lifts the feed bar.
It is for down movement, and the mechanism on the right side is for clamp/unclamp movement. The only difference in the shape of the cam is that the other configurations are the same, so we will only explain the left side.
Although the right side will not be explained, the main parts are indicated by adding "a" to the corresponding reference numerals for the same members.

In the press machine 1, a crown 2 and a bed 3 are connected via a side frame 4.
A clamp unit 6 for driving the feed bars 5, 5 is provided near the feed bars 5, 5. A drive unit 7 is provided at one end of the clamp unit 6, and a rod 8 passing through the drive unit 7 and extending vertically is attached thereto. The upper part of the rod 8 reaches the crown 2, and this part is supported by a guide 9, and a lever 10 is provided near the upper end.
is attached by a shaft 11.

Further, a crankshaft 12 for driving the press is mounted on the crown 2, and a cam 14 is mounted on a camshaft 13 which is interlocked with the crankshaft 12 through gears. Furthermore, a cam follower 15 is provided at the tip of the lever 10, and this cam follower 15 is joined to the cam 14, and
A fulcrum bearing 16 provided in the middle of the lever 10 is connected to a link 17 with a pin 18. On the other hand, one end of the link 17 extends toward the cam 14, and the tip is rotatably attached to the crown 2 via a support shaft 19.

The lever 10 is formed with an arc-shaped elongated hole 20 that is drawn around the support shaft of the link 17, and the fulcrum bearing 16 is slidably mounted in the elongated hole 20 and is connected to the lever 10. The link 17 is connected. Further, the tip of the link 17 projects from the lever 10, and is connected to the adjustment shaft 22 of the adjustment unit 21 at the free end 170.

In FIG. 3, the adjustment unit 21 is attached to the mounting member 23.
A motor 24 is provided, which is fixed to the crown 2 with There is. Further, the tip of the adjustment shaft 22 has a threaded shaft 220.
The screw shaft 220 is screwed onto the drive gear 26.

Therefore, when the motor 24 is driven to rotate the pinion 25, the pinion 25 causes the drive gear 26 to rotate.
rotates, and the adjustment shaft 22 moves forward and backward in the axial direction to rotate the link 17 about the support shaft 19 and move the fulcrum bearing 16 along the elongated hole 20.

The lower end of the rod 8 extends toward the bed 3 and is connected to an air cylinder 27 provided at this portion, and this air cylinder 27 securely connects the cam follower 15 and the cam 14. I take it as a thing. On the other hand, the upper end of the rod 8 is connected to an adjustment cylinder 28 that separates the cam 14 and the lever 10 and moves only the rod up and down.

The embodiment has the above-mentioned configuration, and the lever 10 swings around the fulcrum bearing 16 together with the cam follower 15 by the rotation of the cam 14, and the rod 8 moves up and down by the lever 10 to clamp it. unit 6
Lift/lift is applied to the feed bars 5, 5 through the
Provides down motion and clamp/unclamp motion.

By the way, by changing the vertical stroke length of the rod 8, the lift stroke or clamp stroke can be changed. The stroke length of the rod 8 is determined by changing the position of the fulcrum bearing 16 of the lever 10. In addition, when changing the position of the fulcrum bearing 16, the adjustment unit 21
drive the motor 24 to advance and retreat the adjustment shaft 22,
This is done by rotating the link 17.

Since the elongated hole 20 of the lever 10 matches the locus of the pin 18 when the link 17 rotates, the fulcrum bearing 1
Even if the position of the lever 6 is changed to change the lift stroke length or the clamp stroke length, the position of the lever tip (connection with the rod) at the one-side swing limit position of the lever 10 does not change. That is, in lift stroke adjustment, the stroke length can be adjusted while keeping the down end of the feed bar constant, and in clamp stroke adjustment, the stroke length can be adjusted while keeping the clamp end constant.

(Effect of the invention) This invention changes only the clamp stroke without changing the clamp end (inner width of the feed bar) when adjusting the stroke length, and also does not change the down end (feed bar feed line). Therefore, it is not necessary to adjust the inner width of the feed bar or the feed line each time the stroke is adjusted, and the adjustment work can be performed quickly.

[Brief explanation of the drawing]

FIG. 1 is a side view showing the entire transfer drive mechanism, FIG. 2 is a front view showing details of the stroke adjustment section, and FIG. 3 is a sectional view of a unit for adjusting the position of the fulcrum bearing. 1...Press machine, 2...Crown, 3...Bed, 4...Side frame, 5...Feed bar,
6... Clamp unit, 7... Drive unit, 8... Rod, 9... Guide, 10... Lever, 11... Shaft, 12... Crankshaft, 13...
Camshaft, 14...cam, 15...cam follower,
16... Fulcrum bearing, 17... Link, 18... Pin, 19... Support shaft, 20... Elongated hole, 21... Adjustment unit, 22... Adjustment shaft, 23... Mounting member,
24...Motor, 25...Pinion, 26...Drive gear, 27...Air cylinder, 29...Adjustment cylinder.

Claims (1)

[Scope of utility model registration request] A lever having a cam follower at one end, a rod connected to the other end, and a long hole formed in the center, a fulcrum bearing slidably housed in the long hole of the lever, and one end serving as a rotation fulcrum. an adjustment unit having a pivotably supported tip with its tip facing the fulcrum bearing and having the portion pivoted to the fulcrum bearing; and an adjustment shaft that moves forward and backward in the axial direction and connecting the adjustment shaft and the tip of the link; The long hole of the lever is formed in an arc shape that matches the trajectory of the fulcrum bearing and the connecting pin of the link when the link rotates at one of the swing limits of the lever, and the rod is Clamp and lift stroke of a feed bar, characterized in that the tip is connected to a mechanism that moves the feed bar in clamp/unclamp motion or lift/down motion, and the cam follower of the lever is joined to a cam that rotates in conjunction with the crankshaft. Adjustment device.