Metal deforming – By plural tool-couples – With means to feed work between plural tool stations
Patent
1996-05-13
1998-03-17
Crane, Daniel C.
Metal deforming
By plural tool-couples
With means to feed work between plural tool stations
724051, 7240501, B21D 4305
Patent
active
057274169
DESCRIPTION:
BRIEF SUMMARY
This application is a 371 of PCT/DE95/00712, filed May 26, 1995.
BACKGROUND AND SUMMARY OF THE INVENTION
The present invention relates to a transfer device in a metal-forming machine, and more particularly to a transfer press having a slide configured to move up and down via driving devices for metal forming of sheet metal parts, sliding tables for tool change, a cam drive for transfer movement of connecting rods to which travelling carriages are pivotally connected which travel on transfer rails, opposed travelling carriages respectively operatively connected by at least one cross traverse.
Transfer presses, bulky-part transfer presses, press facilities are metal-forming machines in which sheet metal parts are formed by process steps, such as drawing and stamping. For this purpose, the presses have at least one slide on which a tool or a tool set (upper tool) is fastened which interacts with a tool or tool set (lower tool) in the press bed or on a sliding table. The slides can be moved up and down by driving devices of the press. In the areas between the frames and the presses arranged behind them--the so-called no-load stages--, intermediate depositing devices are arranged. The changing of the tools or tool sets takes place by sliding tables which can be moved out of the press for this purpose.
For bridging the described no-load stages between the presses, transfer devices are known, in which case travelling carriages are provided on transfer rails which extend in parallel to the conveying direction of the sheet metal parts, in which case two mutually opposite travelling carriages are, in each case, connected with one another by at least one cross-traverse.
On the cross-traverses, devices are mounted for receiving and transporting the sheet metal parts machined in the press or to be machined in the following press. The above-mentioned devices may be constructed, for example, as grippers or suction devices.
In order to lift the sheet metal part out of a press or to place it in the tool of a following press, the transfer device must carry out, among other movements, a movement perpendicularly to the floor that is, a lifting or lowering movement.
In the case of known transfer devices, the lifting and lowering movement takes place by fact that the whole transfer rail or individual sections of the transfer rail are lifted or lowered with the travelling carriages arranged thereon. The lifting movement is controlled by at least one cam plate which is moved synchronously together with other cam plates in order to thus be able to synchronously move all movable parts of the transfer device.
The above-described state of the art has the disadvantage that the manufacturing and mounting expenditures are relatively high because a plurality of individual parts must be manufactured and mounted.
Another disadvantage are the many moved masses which, during a lifting movement of the transfer device, must all be accelerated and decelerated.
It is therefore an object of the present invention to provide a transfer device which can be manufactured and mounted in a simple manner and at reasonable cost and which has fewer masses moved during a lifting movement.
According to the invention, this object is achieved by providing that the cross traverse is connected on each side by a lifting and lowering device with the respective travelling carriages.
As a result of the arrangement of a lifting and lowering device on each individual travelling carriage, it is no longer necessary to lift the whole transfer rail or sections thereof with all components arranged on the transfer rail so that significantly less mass must be accelerated which has an advantageous effect on the entire dimensioning of the transfer device.
BRIEF DESCRIPTION OF THE DRAWINGS
These and other objects, features and advantages of the present invention will become more readily apparent from the following detailed description thereof when taken in conjunction with the accompanying drawings wherein:
FIG. 1 is an elevational view of a first embodiment of a lifting
REFERENCES:
patent: 3596498 (1971-08-01), Bradlee
patent: 4995505 (1991-02-01), Takahashi
Crane Daniel C.
Schuler Pressen GmbH & Co.
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