Presses – Automatic or material triggered control – Of parallelism of platens
Patent
1991-05-10
1993-03-16
Hornsby, Harvey C.
Presses
Automatic or material triggered control
Of parallelism of platens
72389, 100 99, 100258A, B30B 1524
Patent
active
051934523
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a folding press comprising an upper frame and a lower frame, at least one of the frames comprising at least one deflection means of at least one portion of at least one press member to remedy the deficiencies inherent to the folding process.
BACKGROUND OF THE INVENTION
During the folding with a folding press, deflections occur inside the two frames, these deflections being the more important as the dimensions of the press are important. These deflections depend, in particular, on the shape, the dimensions and the quality of the material to fold, and they are generally not identic for both frames. In particular, when folding a piece, the upper frame has a tendency to bend upwards under the effect of the thrust of the working cylinder pistons, generally arranged at each of the ends of the press, leading to a longitudinal upwards deflection of the surface of the upper die holder. Similarly, the lower frame has a tendency to bend downwards leading to a downwards longitudinal deflection of the surface of the lower die holder. As a result, the respective working surfaces of the two frames and, therefore, of the dies are no longer parallel. The depth of penetration of the male die into the female die will then no longer be the same over the whole length of the press. It follows that the folding angle obtained is not the same over the whole length of the piece which is folded.
In order to remedy these difficulties, certain folding presses comprise compensation cylinders placed in one or both of the frames and arranged to compensate for the deflections due to the working of the press and to obtain, in particular, similar deflections of the upper and lower frames. However, these systems require a great number of trials for adjustment and most of them require the user to determine in advance the deflection due to the operation of the press.
SUMMARY OF THE INVENTION
The object of the invention is to remedy the above inconvenience by proposing a folding press in which the depth of penetration of the male die into the female die remains constant over the whole folding length without requiring a preliminary adjustment of the press.
To this effect, the invention relates to a folding press comprising an upper and a lower frame, at least one of the frames comprising at least one means for deflecting at least a portion of at least one member of the press to remedy to the deficiency inherent to the folding process.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be better understood with the help of the following description of an example of a folding press according to the invention, given by way of example and with reference to the drawing in which:
FIG. 1 is a schematic functional perspective view of an example of a folding press according to the invention,
FIG. 2 is a partial front view of the press showing an embodiment of the comparison device for the deflection of the upper and lower frames,
FIG. 3 is a partial section along A--A of the upper frame of the press of FIG. 2, and
FIG. 4 is a partial section along B--B of the lower frame of the press of FIG. 2.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
The folding press shown in FIG. 1 comprises an upper frame 1 supporting a male die and a lower frame 2 supporting a female die. The lower frame comprises a plurality of compensation cylinders 3 used to compensate the deflections inherent to the folding process. The action of this compensation cylinders is controlled by an electronic device 11, such as a numerical control device. The comparison device for the deflection of each of the frames comprises longitudinal measuring means 4, 5 used to measure the elongation of said frames under deflection, said means being connected to the numerical control device 11.
According to an embodiment of the comparison device shown in FIG. 2, each of the frames comprises two longitudinal bars 4, 5 arranged, respectively, in housings 6, 7 provided, respectively, in the upper frame and in the lower frame. The upper bar 4
REFERENCES:
patent: 3550425 (1970-12-01), Cailloux
patent: 3677009 (1972-07-01), Thatcher
patent: 3914975 (1975-10-01), Kawano
patent: 4016742 (1977-04-01), Shiokawa
patent: 4408520 (1983-10-01), Wons et al.
patent: 4449389 (1984-05-01), Cros
patent: 4732032 (1988-03-01), Kogure
Gerrity Stephen F.
Hornsby Harvey C.
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