Metal deforming – With means to drive tool – Including link-actuated tool support
Patent
1996-09-16
1998-01-27
Jones, David
Metal deforming
With means to drive tool
Including link-actuated tool support
72450, 100282, B21J 918, B21D 3902
Patent
active
057111839
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to an arrangement for a bending unit for bending in a projecting edge flange against a surface of a workpiece, said bending unit comprising a stand supporting the drive unit and a supporting surface for the workpiece, as well as a link system which, in turn, supports a tool holder for a bending tool in such a manner that the tool is displaceable along a predetermined path of movement between a starting position remote from the supporting surface and the workpiece, and a final position in which the edge flange has been bent in against the surface of the workpiece.
BACKGROUND OF THE INVENTION
Bending units of the above type are well known in a number of different designs, and they are often used to bend in a sheet metal edge flange around the edge of another piece of sheet metal to create a welt to join the two pieces together. Operations of this type are common in the auto industry, for example, for manufacturing doors, engine hoods and similar body parts. A common type of drive device for such a bending unit comprises a hydraulic cylinder, which is coupled between the stand and the link system for the tool, whereby extension or retraction of the piston rod of the hydraulic cylinder causes the link system to give the tool the desired movement and provides the required force so that the tool can carry out the desired bending operation. In addition to the drive device itself, a hydraulic unit is required which provides the necessary hydraulic pressure, as well as hydraulic lines and control equipment.
SUMMARY OF THE INVENTION
The purpose of the invention is to provide an arrangement for a bending unit of the type described by way of introduction, which achieves the required driving and is of simple and reliable construction requiring relatively little space. This is achieved according to the invention by an arrangement of the type described by way of introduction, which is characterized in that the drive unit comprises a motor fixed to the stand and coupled to a crankshaft mounted in the stand, that a toggle joint in the form of two articulated links is joined, firstly, to a crank pin mounted on the crankshaft, secondly, to a fixed pivot point in the stand, that a drive link is articulated, on the one hand, to one of said links in the toggle joint and, on the other hand, to the tool holder or a link in the link system supporting the tool holder, and that the toggle joint is provided with means for buckling the toggle joint, from a straight alignment, in one direction or the other, depending on the rotational direction of the crankshaft.
Advantageous embodiments of the arrangement according to the invention are revealed in the subclaims.
BRIEF DESCRIPTION OF THE DRAWINGS
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 side view of a device according to one embodiment of the invention, said device being shown in its starting position,
FIG. 2 is a side view corresponding to FIG. 1 but with the device shown in a transition position,
FIG. 3 is a side view corresponding to FIG. 1 but with the device shown in a prewelting position,
FIG. 4 is a side view corresponding to FIG. 1 but with the device shown in a final position after a completed bending operation, and
FIG. 5 shows from above a view of the device shown in FIGS. 1-4.
DETAILED DESCRIPTION OF THE INVENTION
The bending unit shown in the drawings is constructed of a stand 1, which carries a supporting surface 2 for a workpiece 3 with an edge flange 4 to be bent in against the main portion of the workpiece 3 with the aid of a bending tool 5. The tool 5 is carried in a tool holder 6, which is in turn supported by a link system with two links 7 and 8. Link 7 is articulated at points 9 and 10 to the stand 1 and to the tool holder 6, respectively. The link 8 is articulated at pivot points 11 and 12, respectively, to the stand 1 and to the tool holder 6, respectively. The pivot points 9-12 are
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patent: 5050422 (1991-09-01), Dorsett
patent: 5315855 (1994-05-01), Jackson
patent: 5457981 (1995-10-01), Brown et al.
patent: 5495742 (1996-03-01), Dorsett
AB Volvo
Jones David
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