JPH0735630Y2 - Work transfer device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a work transfer device for transferring a sheet-like work to a press.

[Prior Art] When a sheet-like work is carried into the conventional transfer press, a disstacker is provided on the upstream side of the press, and the works separated by the disstacker are conveyed to the work carry-in port of the press by the work conveying device. After that, the work is conveyed to each processing station of the press by the transfer feeder installed in the press.

Further, there is a transfer feeder in which a cross bar is provided between the transfer bars, a vacuum cup is mounted on the cross bar, and the work is sucked by the vacuum cup and conveyed to each processing station.

In the transfer feeder as described above, the crossbar b to which the vacuum cup a is attached is designed to operate along a locus c as shown in FIG. 6, but when the work d is a thin plate, the vacuum cup a is Adsorbed work d
There is a case where the end portion of the lower part bends downward as shown by an imaginary line and interferes with the lower mold f when it is loaded into the processing station W ₁ .

Therefore, the protruding amount l of the vacuum cup a in the traveling direction is
Although it is desired to reduce the deflection of the workpiece d by increasing the pulling amount l, the vacuum cup a in the advancing direction is moved to the upper mold f ′ when stopped at an intermediate position during the return.
Therefore, the overhang amount l cannot be made too large.

Therefore, conventionally, when the work d such as a thin plate is conveyed, the work d is pre-bent to prevent the work d from being bent.

[Problems to be solved by the device]

However, when the work d is pre-bent in advance, a bending mark remains on the work. Therefore, it is necessary to avoid this part when molding the product. When the yield of the material is poor and the bending mark cannot be avoided. Since the bending marks are damaged and remain on the product, there are problems such as deterioration of product quality.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a work transfer device capable of carrying in a work without pre-bending.

[Means and Actions for Solving the Problems]

In order to achieve the above-mentioned object, the present invention provides a work transfer device for transferring a work separated into a transfer press by a destacker into a transfer press, wherein a loader carrier movable in the work transfer direction is provided with a plurality of vacuum cup arms. A vacuum cup for adsorbing a work is attached to the lower surface of these vacuum cup arms via a spring cylinder, and the lift amount of the vacuum cup is set to be larger on the central side and gradually smaller on both sides.

As a result, when the work is adsorbed by each vacuum cup and carried in by the transfer press, the work itself bends in an arc shape due to the weight of the work, so the work becomes stiff and the tip can be carried into the transfer press without sagging. become able to.

〔Example〕

One embodiment of the present invention will be described in detail with reference to FIGS.

In the figure, reference numeral 1 is a main body of this device provided on the upstream side of the transfer press 2 and has a lift frame 1b which is vertically moved via a lift rod 1a. A guide rail 1c is laid along the line.

The loader carrier 4 is supported on the guide rail 1c.

A feed lever 3 swingable in the work transfer direction A is connected to the loader carrier 4 via a link 3a. The feed lever 3 reciprocates the loader carrier 4 in the work transfer direction and at the same time the loader carrier 4 is moved. Four
A guide rail 4a is laid on the lower surface of the guide rail in a direction orthogonal to the work transfer direction A, and a plurality of subcarriers 4b are supported on the guide rail 4a.

A screw shaft 6 rotated by a left / right adjusting motor 5 is screwed into each of the sub-carriers 4b so that the sub-carriers 4b can be moved and adjusted in the left / right direction by the left / right adjusting motor 5. Guide rails 4c are laid on the lower surface of the carrier 4b along the work transfer direction A, and arm mounting members 8 are supported on the guide rails 4c, respectively.

The front and rear adjust motors 10 are attached to the respective arm attachment members 8.
The screw shaft 9 rotated by is screwed so that each arm attachment member 8 can be moved and adjusted in the work transfer direction A by each front / rear thrust motor 10.
A base end portion of a vacuum cup arm 11 is attached to each arm attachment member 8.

On the vacuum cup arm 11, a vacuum cup 13 for adsorbing the work piece 12 is attached to the tip and the intermediate portion downward via a spring cylinder 14.

The spring cylinder 14 is composed of an outer cylinder 14a fixed to the vacuum cup arm 11 side and an inner cylinder 14b retractably contained in the outer cylinder 14a. The compression springs 14c are contained in the inner and outer cylinders 14a and 14b.
The mounting shaft 13a of the vacuum cup 13 penetrates through the center of the spring cylinder 14 in the vertical direction.

The mounting shafts 13a of the vacuum cups 13 mounted on the vacuum cup arms 11 located on both sides are the shortest as shown in FIG. 3 (a), and the vacuum cups mounted on the vacuum cup arms 11 located on the center side. The mounting shaft 13a of 13 is the longest as shown in Fig. 3 (c), and the vacuum cup arms on both sides and in the center.
The mounting shaft 13a of the vacuum cup 13 mounted on the vacuum cup arm 11 located between 11 is shown in FIG.
As shown in, the length is set to an intermediate length of the long / short mounting shaft 13a.

On the other hand, reference numeral 16 in the drawing is a centering device, which places the work 12 conveyed from a disstacker (not shown) via a belt conveyor 17 on the skid 16a and presses the stopper 16b and the side guide 16c from the front, rear, left and right directions. The work 12 is centered.

Next, the operation will be described. The work pieces 12 separated one by one by a not-shown disstacker and carried into the centering device 16 are centered by the centering device 16 and then the vacuum cup arm 11 standing by above is lowered and the vacuum cup arm 11 is lowered. It is adsorbed by a vacuum cup 13 attached to the lower surface of 11.

At this time, the compression spring 14c provided in the spring cylinder 14 of the vacuum cup 13 attached to the central vacuum cup arm 11 is most flexed, and the work pieces 12 are simultaneously attracted by the respective vacuum cups 13.

After that, as the vacuum cup arm 11 rises, the work
12 is also raised, but due to the difference in the length of the mounting shaft 13a mounting the vacuum cup 13, the vacuum cup 13 mounted on the vacuum cup arm 11 located at the center
Is the lowest, and the vacuum cups 13 attached to the vacuum cup arms 11 located on both sides are the highest, so that the work pieces 12 adsorbed by the respective vacuum cups 13 are elastically deformed as shown in FIGS. 4 and 5. .

As a result, the work 12 can be made to have a waist, and in this state, the work can be performed while the loader carrier 4 moves.
By loading 12 into the transfer press 2, the transfer press 2 can be installed without the tip of the workpiece interfering with the mold.
It becomes possible to carry it into the processing station W ₁ .

In the above embodiment, the lift arm 1b supporting the loader carrier 4 is moved up and down via the lift rod 1a. However, even if the skid 16a of the centering device 16 is moved up and down, the work 12 can be moved in the same manner. Carry-in can be done.

[Effect of device]

As described in detail above, this device has a large lift amount of the vacuum cup attached to the vacuum cup arm on the center side and decreases on the both sides.
When the work is adsorbed by the vacuum cup and carried in, the work is elastically deformed into an almost bow shape due to its own weight, so that the work becomes stiff and the end portion does not bend.

As a result, the work can be carried into the transfer press without interference with the mold, and the work does not need to be pre-bent in advance, so there is no bending mark left on the work and the product quality is improved. You can also

[Brief description of drawings]

FIG. 1 is a plan view of a work transfer device showing an embodiment of the present invention, FIG. 2 is a side view thereof, and FIGS. 3 (a), (b),
(C) is a cross-sectional view of a spring cylinder provided in the vacuum cup, FIGS. 4 and 5 are operation explanatory views, and FIG. 6 is a conventional explanatory view. 2 is a transfer press, 4 is a loader carrier, 11 is a vacuum cup arm, 12 is a work, 13 is a vacuum cup, and 14 is a spring cylinder.

Claims (1)

[Scope of utility model registration request] 1. A work transfer device for transferring, into a transfer press 2, works 12 separated one by one by a destacker, a loader carrier 4 movable in a work transfer direction A is provided with a plurality of vacuum cup arms 11. A vacuum cup 13 for adsorbing the work 12 is attached to the lower surface of the vacuum cup arm 11 via a spring cylinder 14, and the lift amount of the vacuum cup 13 is set such that the central side is large and the both sides are gradually decreased. Work transfer device.