DE2714855C3 - Transportable memory for transporting workpieces between processing machines - Google Patents

Description

40

The invention concerns; a portable memory according to the preamble of claim 1 for transport of workpieces between processing machines.

According to DE-OS 25 46 389, disc-shaped workpieces with a central bore during loading or unloading by eccentrics acting on the outer circumference, by stepped slides or held by a gripper-like retractable and extendable device. These devices have either inaccuracies or require complex actuating devices.

From GB-PS 10 51993 are memories for a Conveyor belt known, with the support of the parts also takes place via the workpieces from the outside inferior gripping levers and the separation by clamping of the next following workpiece is also carried out using levers that attack from the outside.

It is the object of the invention, an accurate fixing and secure clamping to create the schcibenförmi- m> gen work gap with zentrischcr hole without additional operating devices and with a small footprint.

To solve this problem, a portable memory with the in the characterizing part of the *> 5 is used Main claim specified features.

This device with a clamping sleeve results in better and simpler centering and more precise Storage of the workpieces. It also stands for the gripper arm of the handling device for the processing machine more space is available, as the brackets and the like required for external clamping are no longer necessary.

In the drawing, an embodiment of the portable memory is shown and in the explained in more detail below. It shows

1 shows an operating station for a machine tool with workpiece magazines and automatic removal and loading devices, F i g. 2 is a plan view of the station according to FIG. I, F i g. 3 a removal or loading station in section.

In Fig. 1 are on overhead conveyors 1 to be filled magazines 2, to empty magazines 3 or full Magazines 4, which are to be conveyed to a machine tool 8, arranged on each machine tool 8 is a loading station 5 for loading the empty magazine 2 with finished workpieces and a removal station 6 for removing the workpieces to be processed piece by piece from the magazine 3.

For conveying the workpieces from the removal station 6 to the clamping device of the machine tool 8 and from this to the loading station 5 is a per se known handling device 7, to which, for example, an automatically controlled gripper or the like. Associated may be provided, as shown in FIG. 2 shows.

The withdrawal station 6 according to FIG. 3 consists of one Frame 10 in which the lifting cylinder U with its pressure medium connections Ha and 116 is arranged. on the frame 10 is centric to the lifting cylinder 11 of the clamping cylinder 12 with its pressure medium connections 12a and 126 are provided and guided in a guide tube 13 by means of a guide piece 23. The guide piece 23 is connected to a tubular part 146 of the receiving plate 14 via a spacer tube 24. Here are the spacer tube 24 and tubular part I4 £> also guided in the guide tube 13.

Inside the tubular part 146, the clamping bush 15 is guided, the uh'.rres end with the Piston rod of the clamping cylinder 12 is connected. The upper end of the clamping bush 15 v / eist slots 15a for the pawls 18 of the magazine rod 3 'and have an inner cone 156.

The magazine rod 3 ', which is aligned axially with the lifting cylinder and the clamping cylinder, carries on its lower end an end piece 16. in which the pawls 18 are mounted to support the lowermost workpiece 9a. The pawls 18 are spread apart by a spring 19 and a pressure piece 20 (e.g. a ball).

An intermediate piece 21 is arranged between the end piece 16 and the end of the magazine rod 3 ', “'If an outside corner 22 is provided.

By actuating the lifting cylinder II, the Aiifnahmcplattc 14 is raised until the lowest Workpiece 9a of the magazine 3 rests. The lifting cylinder 11 is controlled via the limit switch 17. At the same time, this limit switch 17 causes the clamping bush 15 to be raised by means of the clamping cylinder 12 until the inner cone 156 of the clamping sleeve 15 runs up onto the outer cone 22 of the magazine 3 and by spreading the clamping sleeve 15, the second lowermost workpiece 96 is held. Be at the same time swiveled into the slots 15a of the Spannbuchsc 15 pawls 18 so that the lowest Workpiece 9a rests freely on receiving plate 14.

Since the clamping cylinder 12 is only partially extended when the first lifting cylinder 11 is fully extended.

If the lifting cylinder 11 is subsequently vented and the receiving plate 14 is moved downwards with the lowermost workpiece 9a, the clamping cylinder 12, which is still under pressure, can be extended to its full height. In this way, there is automatically a separation between the lowermost workpiece 9a and the workpiece 9b located above it, which is held by the clamping bush 15. After reaching its full extension height, the clamping cylinder 12 is also vented, so that the lifting and clamping cylinders now return together to their starting position.

With the venting of the clamping cylinder 12 and the damk beginning downward movement of the clamping bush 15 also the workpiece 9Zj is free and from the meanwhile released and by the spring 19 again spread pawls 18 added.

To avoid a falling movement of the stack of workpieces and an associated sudden impact on the To avoid pawls, the outer cone 22 can be led away downward with a spring (not shown) be. During the downward movement of the clamping cylinder 12 and thus the clamping bush 15, the workpiece stack follow this movement and is placed on the latch without impact. Now the connection too between the clamping bush 15 and the outer cone 22 is released and the outer cone 22 is counteracted by the spring a limit stop is pressed, which holds it at the level of the second workpiece from the bottom.

The description of the mode of operation relates to the unloading of a magazine. Likewise, it can be done in reverse Order, e.g. B. the magazine 2, are loaded in the station.

For this purpose 2 sheets of drawings

Claims (2)

Patent claims: 1. Transportable storage for the transport of workpieces between processing machines, the is designed as a hanging, mobile workpiece magazine that is attached to removal and loading stations can be driven past, in each of which one can be raised and lowered by a lifting mechanism, the the lowest workpiece-bearing receiving plate is provided, which from below the workpieces in introduces the respective magazine or removes it from it, with the lowest workpiece in each case Transport of the workpiece magazine rests on resilient pawls and being in the carrying position of the Mounting plate the second lowest workpiece is held at a distance from the pawls, characterized in that between the lifting cylinder (11) and the receiving plate (14) a clamping cylinder (12) and a clamping sleeve (15) for pivoting the pawls (18) for the purpose of Release of the lowest workpiece (9a) and for Internal clamping of the second lowermost workpiece (96) are arranged. 2. Transportable storage device according to claim 1, characterized in that the clamping sleeve (15) by an outer cone (22 ^ of the transportable Storage (magazines 2, 3, 4) is spread and arranged by means of a spring against such a The stop is pressed so that the outer cone (22) is level with the second lowest workpiece is located and after lowering the mounting plate (14) beginning downward movement of the clamping cylinder (12) of the outer cone (22) this follows, the connection between the outer cone and the clamping bush (15) bdm placing on the spread pawls (18) is released.