Metal deforming – By relatively movable offset tool-faces – With tool motion in fixed path
Patent
1991-09-04
1993-04-20
Jones, David
Metal deforming
By relatively movable offset tool-faces
With tool motion in fixed path
72218, B21D 702
Patent
active
052031950
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a bending machine for bending bar-shaped material in two directions.
BACKGROUND
Bending machines are known which have a rotatable bending disc, which is provided with a central bending mandrel and an eccentrically located bending tool, and a stationary, adjustable steadying arm.
A bending machine of this type, which is suitable for bending wires, bars, pipes or the like, is known from German Patent Disclosure Document 22 21 185, Fasholz. In that machine, the steadying arm is inserted into stationary slotted control arms, which are displaceable in their longitudinal direction in accordance with the diameter of the material to be bent. The bending disc is located with its bending tools between the slotted control arms. At the beginning of each bending operation, the stationary steadying arm and the eccentrically located bending tool are both on one side of the material to bent, and the central bending mandrel is located on the opposite side. When the bending direction changes, the material to be bent must be located on the opposite side of the central bending mandrel, and both the steadying arm and the eccentric bending tool must be moved to the other side of the material to be bent. The steadying arm is reinserted manually into the corresponding slot of the slotted control arm, and the control arm must sometimes additionally be readjusted in its longitudinal direction.
The disadvantage of this construction is that setting up the steadying arm entails considerable effort, and because of the manual reinsertion and adjustment, mistakes cannot be precluded.
A bending machine is also known from German Patent Disclosure Document 38 16 005 Peruzzi, in which a pair of movable steadying arms is supported on a stationary frame carrying the bending disc. Each steadying arm can be pivoted by a drive mechanism out of a working position into a position of repose. Depending on the bending direction, one steadying arm at a time, in its working position, cooperates with the bending tools, while the other steadying arm is contrarily pivoted 90.degree. into the position of repose, so as not to hinder the bending motion of the bending tool. If the diameter of the material to be bent changes, the steadying arms are displaced vertically with respect to their stop face, which is in the working position, by the aid of drive elements. This construction has the disadvantage that driving and controlling the two steadying arms is very complicated and expensive, and it also has the deficiency that because the working position of the steadying arms is defined fixedly relative to the bending elements, only the ends of the bars can be bent in different directions at a time.
THE INVENTION
It is an object to create a bending machine of the generic type referred to at the outset above, which avoids the disadvantages of the known versions discussed above and in a simple manner enables automatic adjustment of the steadying arm to the material to be bent, without needing additional aids and regardless of the bending direction.
Briefly, the bending disc of the bending machine is supported coaxially in a housing which is rotatably supported about an axis in a stationary frame. The bending disc is rotatable by means of a rotary drive mechanism mounted on the housing. A steading element or arm is eccentrically located on the housing and by means of the rotary drive mechanism can be placed against the material to be bent.
In accordance with a preferred embodiment of the invention, the housing is preadjustable, for coarse positioning of the steadying element or arm, in a position predefined by the applicable bending direction, with the aid of a swivel arm mounted on a bearing journal of the housing and actuatable by an associated swivel drive mechanism.
In a further feature of the invention, the bending disc is rotatably supported on the side of the bearing journal of the housing remote from the swivel arm.
With a structurally simple, compact design of the bending machine, the invention makes it
REFERENCES:
patent: 3670541 (1972-06-01), Peddinghaus
patent: 3894422 (1975-07-01), Peddinghaus
patent: 4571974 (1986-02-01), Pollhammer et al.
patent: 5025651 (1991-06-01), Del Fabro et al.
Ritter Gerhard
Ritter Klaus
Schmidt Gerhard
EVG Entwicklungs- u.Vertwertungs-Gesellschaft mbH
Jones David
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