Driving device with force-limiting element for a bending unit

Metal deforming – With means to drive tool – Including link-actuated tool support

Patent

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Details

724525, 100280, B21J 918, B21D 500

Patent

active

057460868

DESCRIPTION:

BRIEF SUMMARY
FIELD OF THE INVENTION

The invention relates to a driving device for a bending unit for bending-in a projecting edge flange against a surface of a workpiece, said bending unit comprising a stand, which carries both the driving device and a supporting surface for the workpiece as well as a linkage system, which in turn supports a bending tool in such a manner that the tool is movable relative to the workpiece placed on the supporting surface along a predetermined path of movement.


BACKGROUND OF THE INVENTION

Bending units of the above mentioned type are well known in a number of different designs, and they are used to bend in, for example, an edge flange on a sheet metal piece around the edge of another sheet metal piece to create a type of folded seam for joining the two metal pieces to each other. Operations of this type are common, for example in the automobile industry to manufacture doors, engine hoods and similar body parts. A common type of driving device for such a bending unit comprises a hydraulic cylinder, which is coupled between the frame and the link system. Extending or retracting the piston rod of the hydraulic cylinder acts on the linkage system to give the tool the desired path of movement and achieve the required force so that the tool will be able to carry out the desired bending operation. In addition to the driving device itself, a hydraulic unit is required to provide the required hydraulic pressure as well as hydraulic lines and control equipment.


SUMMARY OF THE INVENTION

The purpose of the invention is to achieve a new type of driving device for a bending unit of the type described by way of introduction, said driving device being of simple construction and having reliable operation as well as requiring very little space. This is achieved according to the invention by virtue of the fact that a motor is mounted on the stand and is coupled to a crankshaft mounted in the stand, said crankshaft carrying on a crank pin one end of a connecting rod, the other end of which is articulated to a link in the linkage system, said connecting rod being movable by rotation of the crankshaft between a rest position, in which it keeps the linkage system and thereby the tool in a deactivated position, and a work position, in which it keeps the linkage system and the tool in an end position, where bending-in of the edge flange is completed.


BRIEF DESCRIPTION OF THE INVENTION

The invention will be described in more detail below with reference to the accompanying drawings, which show one embodiment of the invention and in which
FIG. 1 is a schematic side view of a bending unit with a driving device according to the invention,
FIG. 2 is a schematic view of the device according to FIG. 1 as seen in the direction of the arrow 2 in FIG. 1, only a small portion of the bending unit being shown,
FIG. 3 is a frontal view, partially cut away, showing a portion of the driving device according to FIG. 2, and
FIG. 4 shows a section along the line IV--IV in FIG. 3.


DETAILED DESCRIPTION OF THE INVENTION

FIG. 1 shows a bending unit made up of a stand 1, on which there is disposed a supporting surface 2 for a workpiece 3 with an edge flange 4, which is to be bent-in towards the main portion of the workpiece 3 with the aid of a tool 5. The tool 5 is held in a tool holder 6, which in turn is carried by a linkage system with two links 7 and 8. The link 7 is articulated via two pivot points 9 and 10, respectively, to the stand 1 and the tool holder 6, respectively. The link 8 is articulated at the pivot points 11 and 12, respectively, to the frame 1 and the tool holder 6, respectively. The link 8 also has a pivot point 13 for connecting a drive unit, as will be described in more detail below. The links 7 and 8 form together with the frame I and the tool holder 6 a linkage system which makes it possible to move the tool holder 6 relative to the frame 1 and the supporting surface 2 so as to move the tool 5 towards and away from the workpiece 3.
The bending device described above and shown schematically in FIG. 1

REFERENCES:
patent: 2726702 (1955-12-01), Laxo
patent: 2847051 (1958-08-01), Renard
patent: 4706489 (1987-11-01), Dacey, Jr.
patent: 5050422 (1991-09-01), Dorsett
patent: 5315855 (1994-05-01), Jackson

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