Metal deforming – By deflecting successively-presented portions of work during... – By use of deflectors arranged to bend work longitudinally of...
Patent
1998-11-27
2000-06-27
Crane, Daniel C.
Metal deforming
By deflecting successively-presented portions of work during...
By use of deflectors arranged to bend work longitudinally of...
B21D 514
Patent
active
060792477
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
This invention falls within the domain of working with sheets of material, such as sheets of metal, with a view to bending them, more specifically the object of the invention is a machine, called a "bending machine", designed to bend the sheets of metal.
Patent FR-974.789 (BIGWOOD.degree. describes a bending machine for sheet metal with a pivoting upper support roller and a retractable bearing; however a machine like this uses a complex mechanism for adjusting the radius of the bend by means of a motor driven screw.
The Applicant's patent FR-2.528.334 describes a bending machine with a pivoting support roller, and in this respect it is similar to the above mentioned device, this pivoting support roller is situated above a pair of two smooth rollers with a smaller diameter, called pressers, parallel to each other and able to be moved away from each other in order to produce different bending radii; the performance of these machines was not as good as that of the preceding machines but they were cheaper and were suitable for boiler making concerns where the bending constituted only one part of the job. The present invention relates specifically to rollers like these.
Patents FR-2.528.335 and FR-2.637.206 belonging to the same Applicant describe bending machines said to have toothed rollers consisting of a big roller called a support roller and two sets of numerous rollers called pressers with sufficiently small diameter relative to that of the support roller and interlocking with each other so that they are able to have lines of contact with the support roller, closer than those permitted by full rollers, in order to increase the accuracy of the bending and to reduce to a minimum the parts remaining straight at the extremities of the sheet on entry to and exit from the bending operation; in this type of machine the toothed rollers, situated above the big roller, are grouped in two parallel trains of rollers each train itself being composed of several coaxial rollers; in certain machines of this type, determination of the bending radius is carried out by varying the distance between the presser rollers (toothed) and the support roller, using an inclined plane device (sloped cams and wedges) which can be moved by sliding one against another by means of a crank with a gravitational indicator dial. These machines, with high productivity and great ease of handling, are generally used by specialist concerns in the series production of ferrules (sheets of metal bent and welded).
These machines have a common characteristic in that the presser and support rollers always remain parallel; however in the case of thin sheets (for example thinner than 2 millimeters) or of soft material (for example aluminium) they have the disadvantage of "marking" the sheet as a result of the toothed nature of the presser rollers.
The aim of the present invention is to make a bending machine available to non-specialist concerns which will permit the bending of quite large sheets, that are not very thick, and/or made of a material that is not very hard.
SUMMARY OF THE INVENTION
According to the present invention a machine for bending sheets, called a bending machine, of the type of bending machine consisting principally of a roller, called a support roller, around which the sheet is to be rolled after bending, and smooth rollers, called pressers, designed to press against the support roller is characterised in general
in that the support roller around which the sheet is rolled after bending, is connected at a first extremity to a motor and is supported at this first extremity by a fixed bearing, and at its other extremity by a retractable (swivel) bearing, the axis of this support roller remaining fixed, and
in that the presser rollers are smooth rollers arranged in pairs with a fixed distance between axes and supported by a number of bearings, or rollers, themselves supported by a beam which rests on the frame by means of inclined wedges
It is therefore in the new combination of known means, and in the est
REFERENCES:
patent: 4056962 (1977-11-01), Gerhardt
patent: 4706488 (1987-11-01), Williamson
patent: 4977770 (1990-12-01), Gravier
Crane Daniel C.
Jammes Industrie S.A.
Kasper Horst M.
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