JPH0248093Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a drive device for a feed bar in a transfer press.

(Prior art) In a device that drives a feed bar in conjunction with the drive section of a press, a pair of rods that move up and down in conjunction with a cam that is linked to a crankshaft or a cam provided on a slide, and a drive of the feed bar are used. It is equipped with a clamp unit with a built-in device, and by the vertical movement of each rod, the vertical movement of one rod performs the clamp/unclamp movement of the feed bar, and the other rod performs the lift/down movement.

Generally, the rod is provided with an air cylinder at its lower end to ensure secure connection with the driving cam, and the cam follower at the upper end of the rod is pressed against the driving cam.

In the conventional structure, when the press stops while the feed bar is in the middle of being lifted and the air pressure in the air cylinder installed at the lower end of the rod is released, the feed bar descends due to its own weight and at the same time the cam follower at the upper end of the rod is released from the drive cam. They may be separated. That is, in the conventional structure, the rod is moved up and down by a driving cam, but when the rod is lowered, the feed bar is raised, and conversely, when the rod is raised, the feed bar is lowered.

As described above, if the feed bar is lowered due to the air pressure in the air cylinder being released for some reason, there is a problem in that the feed bar cannot be lifted normally when the press operation is restarted.

(Problem to be solved by the invention) The invention provides a drive device that can prevent the feed bar from falling due to its own weight even if the press stops during the lift of the feed bar and the supply of air and power is interrupted. .

(Means for Solving the Problems) Means for solving the above problems include a pair of drive cams that rotate in conjunction with the drive section of the press, and one end of which comes into contact with each of the drive cams through a cam follower. It is equipped with a pair of levers, a pair of rods connected to the ends of each of the levers and held so as to be movable up and down, and an air cylinder provided at the lower end of each of the rods. In a device in which one rod performs clamping/unclamping motions of the feed bar and the other rod performs lift-down motions, a brake cylinder is coupled to at least the rod that causes the feed bar to perform lift-down motions.

(Function) When the press is operated, vertical movement is transmitted to the rods 9 and 20 via the lever by the driving cam interlocked with the slide, and the vertical movement of each rod 9 and 20 causes one rod to move the feed bar. Perform a lift/down motion on the rod, and perform a clamp/unclamp motion on the other rod.

When the press stops midway, the supply of air pressure is also interrupted at the same time, but the rod is fixed by the brake cylinders 10 and 21 to prevent the feed bar from descending due to its own weight during the lift.

(Example) The drawing is a side view of the entire assembled press machine 1, in which a crown 2 and a bed 3 are connected via a side wall 4, and feed bars 5, 5 are driven near the bed 3. A clamp unit 6 is provided.

The clamp unit 6 has a built-in mechanism for clamping/unclamping the feed bar as well as lifting/downing the feed bar, and drive units 7 and 8 are provided at both left and right ends. Note that the advance/return movement of the feed bar is performed by a device not shown.

Of the two drive units, the left drive unit 7 is provided with a first rod 9 passing through it vertically, and the upper end of the first rod 9 is connected to a brake cylinder 10 provided on the crown 2. has been done. This first rod 9 causes the feed bar to be moved up and down via the drive unit 7. Further, a lever 11 is pivoted near the upper end of the first rod 9 directly below the brake cylinder 10, and a cam follower 12 provided at the end of the lever 11 is joined to a driving cam 13.

The brake cylinder 10 has various structures, but in this embodiment, the outer periphery of the rod is clamped with zero air pressure, and when a predetermined amount of air is supplied, the brake is released and sliding in the axial direction is possible. .

Further, the driving cam 13 is interlocked with a crankshaft 14 mounted on the crown 2, and
The lever 11 is rotatable by a support shaft 16 whose fulcrum portion is connected to a link 15, and the end of the link 15 is connected to an adjusting unit 17 whose mounting portion at the tip moves forward and backward. .

Therefore, as the crankshaft 14 rotates, the drive cam 13 rotates, and the link 15 swings about the support shaft 16, which causes the first rod 9 to move up and down, causing the inside of the clamp unit 6 to move up and down. The mechanism causes the feed bars 5, 5 to perform lift/down movements.

In addition, the lower end of the first rod 9 is connected to the bed 3.
, and the air cylinder 1 installed at the relevant part
8, and presses the cam follower 12 against the drive cam 13 via the first rod 9.

On the other hand, a second rod 20 is provided vertically through another unit 8 of the drive units, and a brake cylinder 21 is provided at the upper end of this second rod 20.
It is interlocked with the crankshaft 14 by a cam mechanism 22 having the same structure as the cam connected to the upper end of the first rod 9, and an air cylinder 23 is provided at the lower end to ensure the connection of the cam follower.
The second rod 20 causes the feed bar to perform clamping and unclamping movements within the clamp unit 6.

The embodiment has the above-described configuration, and the crankshaft 1
The press slide is driven by the rotation of 4, and at the same time, the feed bars 5 and 5 are lifted and
A down movement and a clamp/unclamp movement are performed.

An air cylinder 18 is provided at the lower end of the first rod 9 that causes the feed bar to perform lift-down motion, and a brake cylinder 10 is provided at the upper end, and the same system of air pressure is supplied to these two cylinders. For example, when the air supply is interrupted for some reason, the brake cylinder 10 can fix the first rod 9 and prevent the feed bars 5, 5 from descending under their own weight.

(Effect of the invention) Even if the supply of air and power to the press machine is interrupted, the brake cylinder fixes the rod that lifts and moves the feed bar, so the positional relationship between the press and the feeder can be maintained. be.

[Brief explanation of drawings]

The drawing is a side view of the entire assembly. 1...Press machine, 2...Crown, 3...Bed, 4...Side wall, 5...Feed bar, 6...
Clamp unit, 7, 8... Drive unit, 9... First rod, 10... Brake cylinder, 11... Lever, 12... Cam follower,
13... Drive cam, 14... Crankshaft, 15
... Link, 16 ... Support shaft, 17 ... Adjustment unit, 18 ... Air cylinder, 20 ... Second
Rod, 21... Brake cylinder, 22...
Cam mechanism, 23... air cylinder.

Claims (1)

[Scope of utility model registration request] A pair of drive cams that rotate in conjunction with the drive unit of the press, a pair of levers whose one end abuts each of the drive cams through a cam follower, and a pair of levers that are connected to the ends of each of the levers and are movable up and down. It is equipped with a pair of rods to be held, and an air cylinder provided at the lower end of each rod, and by vertical movement of each rod, one rod performs clamp/unclamp movements of the feed bar, and the other rod performs lift/down movements. What is claimed is: 1. A drive device for a feed bar in a transfer press, characterized in that a brake cylinder is coupled to a rod that lifts and moves at least the feed bar.