Metal deforming – By use of non-deforming work-gripping clamp and relatively... – Clamp structure constitutes sole initial metal-deforming...
Reexamination Certificate
2000-07-13
2001-10-23
Crane, Daniel C. (Department: 3725)
Metal deforming
By use of non-deforming work-gripping clamp and relatively...
Clamp structure constitutes sole initial metal-deforming...
C072S319000, C029S243580
Reexamination Certificate
active
06305208
ABSTRACT:
This application is a 371 of PCT/EP99/00088, filed Jan. 9, 1999.
FIELD OF THE INVENTION
The present invention pertains to an edging device or hemming device with a machine frame, with a hemming bed arranged therein such that it can be raised and lowered with a hemming stroke and/or a displacing stroke, with a plurality of hemming jaws that can be moved into the working range of the hemming bed and with drives for the hemming bed and the hemming jaws.
BACKGROUND OF THE INVENTION
In a prior-art hemming device (U.S. Pat. No. 5,150,508), all drives consist of hydraulic cylinders. Since a plurality of hydraulic cylinders, which must all be actuated simultaneously and uniformly in terms of their stroke and their dynamic effect, are provided not only for the hemming stroke but also for the displacing stroke, the control of these drives can be problematic. To keep the number of the respective groups of hydraulic cylinders low and to guarantee, at the same time, a reliable support of these hydraulic cylinders, the components involved in this, especially the moving components, must have relatively large masses.
SUMMARY AND OBJECTS OF THE INVENTION
The object of the present invention is to simplify the control and to reduce the masses of the moving components by the use of other drives in hemming or edging devices.
This object is accomplished by the hemming bed or edging bed having an electromechanical drive for the hemming stroke, which acts on the hemming bed via driven cams or cranks. The necessary angular position of the cams or cranks can be controlled with simple means via the electromechanical drive. The cams or cranks can be accommodated in a space-saving manner and their support requires less effort, so that the masses of the moving components can also be reduced. This also applies to a preferred embodiment of the present invention, in which the cams or cranks of the hemming stroke drive act on an intermediate plate, wherein another electromechanical drive with driven cams or cranks, which are arranged between the intermediate plate and the hemming bed, is used for the displacing stroke. The intermediate plate is preferably guided on the machine frame.
The drives preferably have a transmission each with two outputs for shafts rotating in opposite directions, which carry the cams or cranks. Lateral forces, which occur during the rotation of the shaft and of the cams or cranks arranged thereon, are absorbed by the bearings of the shaft over a short distance during the movement of the shafts in opposite directions. Since considerable forces are transmitted by the cams or cranks, a design in which the shafts are mounted on the machine frame and on the intermediate plate on both sides of their cams or cranks is recommended. In addition, the cams or cranks may be mounted on associated connecting rods, whose other ends are arranged on the hemming bed or on the intermediate plate via bearings. This design also makes it possible to have greater distances between the moving components.
The design in which the cams or cranks for the hemming stroke, on the one hand, and those of the displacing stroke, on the other hand, are arranged vertically one on top of another is of particular significance, because the forces in the intermediate plate are now avoided.
The drive of a holding-down device movable up and down in the machine frame may have a braked gear motor with a driven shaft, on which pinions are arranged, which act on toothed racks which are rigid parts of the frame. The movement of the holding-down device can thus also be controlled in a simple manner.
According to the present invention, the hemming jaws are mounted pivotably on the machine frame and are able to be pivoted with pneumatic cylinders. This makes it possible to arrange the drag bearings of the hemming jaws favorably with respect to the hemming forces to be expected such that the hemming jaws will stabilize themselves during hemming.
On the whole, the use of hydraulic fluid can thus be eliminated in the hemming device according to the present invention
The various features of novelty which characterize the invention are pointed out with particularity in the claims annexed to and forming a part of this disclosure. For a better understanding of the invention, its operating advantages and specific objects attained by its uses, reference is made to the accompanying drawings and descriptive matter in which a preferred embodiment of the invention is illustrated.
REFERENCES:
patent: 2233937 (1941-03-01), Hexdall
patent: 4072118 (1978-02-01), Schultheiss
patent: 5150508 (1992-09-01), St. Denis
patent: 5454261 (1995-10-01), Campian
patent: 6182492 (2001-02-01), Raffin
patent: 43 30 683 A (1995-03-01), None
patent: 1 302 477 A (1962-12-01), None
patent: 1 445 675 A (1966-10-01), None
patent: 2-15830 (1990-01-01), None
Crane Daniel C.
McGlew and Tutle, P.C.
Thyssen Krupp Technologies AG
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