Metal deforming – By use of non-deforming work-gripping clamp and relatively... – Clamp structure constitutes sole initial metal-deforming...
Reexamination Certificate
1999-06-14
2001-01-09
Crane, Daniel C. (Department: 3725)
Metal deforming
By use of non-deforming work-gripping clamp and relatively...
Clamp structure constitutes sole initial metal-deforming...
C072S319000, C072S478000
Reexamination Certificate
active
06170314
ABSTRACT:
This is a national stage application of PCT/EP98/02162 application dated Apr. 14, 1998.
The present invention relates to a bending press for forming channel-shaped bends in the edges of a metal sheet.
BACKGROUND OF THE INVENTION
Conventional bending presses known from the document WO 96/13346.
A bending press according to one embodiment described and illustrated in the document WO 96/13346 comprises a pair of carriages which can be moved along its movable blank-holder in order to rearrange its segments. Each of these carriages comprises a first set of teeth fixed to the carriage, an input shaft housed in the shoe-holder body and connected to the first set of teeth by a toothed sprocket, a second set of teeth fixed to the shoe, and gearing for transmitting the drive of the input shaft to the second set of teeth.
This known mechanism enables the movements of the two shoes to be coordinated with the movements of the movable blank-holder, preferably by numerical control, in a manner such that, for movements of the movable blank-holder away from the fixed blank-holder there are corresponding simultaneous movements of the two shoes towards the centre of the press and towards the fixed blank-holder, without sliding of the shoes on the sheet. The two shoes are returned to the position in which they are moved away from the centre of the press by means of respective spiral springs or equivalent means incorporated in the shoe-holder body and interposed between it and the input shaft of the mechanism.
The mechanism according to document WO 96/13346 represented considerable progress in comparison with the prior art but has the disadvantage of being expensive because of the precision required in the manufacture and assembly of its components, particularly of its sets of teeth and its toothed sprockets.
SUMMARY OF THE INVENTION
The object of the invention is to provide a bending press of the type in question in which the function of controlling the movements of the shoes is performed by much simpler and more inexpensive means.
According to the invention, this object is achieved by means of a bending press in which.
According to the invention, the devices which transmit the movement of the carriages to the shoes in order to move them towards the centre of the press and towards the fixed blank-holder, that is, in order to release them from the channel-shaped bends without sliding on the sheet, do not comprise toothed members requiring very precise manufacture. As will be understood better from a reading of the detailed description given with reference to the drawings, according to the invention, these devices comprise very simple elements which operate by pressure and by relative sliding; even though the cooperating surfaces of these elements require a certain precision of manufacture, this precision does not involve such high costs as the manufacture of teeth.
REFERENCES:
patent: 4660402 (1987-04-01), Hongo
patent: 5313814 (1994-05-01), Yamamoto
patent: 5642639 (1997-07-01), Codatto
patent: WO 96 13346 (1996-05-01), None
Crane Daniel C.
Sughrue Mion Zinn Macpeak & Seas, PLLC
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