Metal deforming – By use of non-deforming work-gripping clamp and relatively... – Clamp structure constitutes sole initial metal-deforming...
Patent
1997-07-11
1999-02-09
Crane, Daniel C.
Metal deforming
By use of non-deforming work-gripping clamp and relatively...
Clamp structure constitutes sole initial metal-deforming...
72478, B21D 504
Patent
active
058680241
DESCRIPTION:
BRIEF SUMMARY
This application is a 371 of PCT/EP95/04152, filed Oct. 23, 1995.
The present invention relates to a bending press for making channel-shaped bends in the four edges of a sheet-metal panel, of the type comprising a pair of opposed, movable and fixed blank-holders cooperating with respective bending blades, in which the movable blank-holder has drive means for its movements and is formed by a series of sections in which two spaced-apart sections are in the form of shoes with projections pointing in opposite directions so that each can be engaged in a channel-shaped bend which has already been made, and in which each shoe is supported by a shoe-holder body and each shoe and the respective shoe-holder body are interconnected by drive means for moving the shoe, such drive means being coordinated with the drive means of the movable blank-holder so that the movements of the movable blank holder away from and towards the fixed blank-holder correspond to movements of the shoes towards and away from one another, respectively, without sliding of the shoes on the sheet metal (P).
A bending press of this kind is known from the document U.S. Pat. No. 5,313,814.
This known arrangement is used in vertical bending presses in which the movable blank-holder is the upper one. In these bending presses, the presence of the movable or "contractible" inserts in the form of shoes is necessary for releasing the panel which has been bent on four sides from the press.
In the bending press known from the document U.S. Pat. No. 5,313,814 the shoe-holder bodies are pivoted in such a manner as to be able to oscillate towards and away from one another. The means for moving the shoe-holders and their shoes are constituted by fluid actuators. Each fluid actuator is connected on one side to the blank-holder and, on the other side, to the respective shoe-holder body through an articulated linkage.
The main object of the invention is to provide a bending press of the kind considered which allows to obtain a more reliable, rugged and accurate connection between the shoe-holder bodies and the movable blank-holder.
According to the invention this object is attained by a bending press of the kind considered, characterised in that: inclined guides; motor and a transmission mechanism for transforming the motion of the motor into a corresponding linear movement of the shoe along its respective inclined guide; and carriage, an input shaft housed in the shoe-holder body and connected to the first set of teeth by a pinion, a second set of teeth fixed to the shoe, and gearing for transmitting the drive from the input shaft to the second set of teeth.
In known bending presses of the type in question, which have been used from about fifty years, but which are not disclosed in printed documents known to the present applicant, the two opposed shoes are simply slidable in oblique directions, for example at 45.degree., and their movements take place by the effect of gravity: when, upon completion of the bending, the upper blank-holder is raised relative to the lower fixed one, owing to their weight, the two shoes remain in contact with the sheet metal supported on the lower blank-holder and slide horizontally thereon to the position in which their projections no longer interfere with the channel-shaped bends in which they were engaged. The upward movement of the upper blank-holder can thus continue so that the panel bent on four sides can be removed from the press.
Moreover, when the upper blank-holder is moved downwards to pinch the panel in cooperation with the lower blank-holder for the formation of a bend, the shoes bear against the sheet metal and slide thereon whilst they are brought to the wide-apart position in which their projections are engaged in the lateral bends already made.
The sliding of the shoes on the sheet metal is undesirable since it may produce unsightly lines on the sheet metal.
As well as achieving the main object of providing a bending press in which the connection between the shoe-holder bodies and the movable blank-holder is more re
REFERENCES:
patent: 4089198 (1978-05-01), Amano et al.
patent: 4660402 (1987-04-01), Hongo
patent: 4722214 (1988-02-01), Hayashi et al.
patent: 5313814 (1994-05-01), Yamamoto et al.
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