Metal deforming – By use of non-deforming work-gripping clamp and relatively... – Clamp structure constitutes sole initial metal-deforming...
Reexamination Certificate
1999-12-14
2001-03-06
Crane, Daniel C. (Department: 3725)
Metal deforming
By use of non-deforming work-gripping clamp and relatively...
Clamp structure constitutes sole initial metal-deforming...
C072S322000
Reexamination Certificate
active
06196041
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a sheet-metal bending press.
Arrangements are known from the documents U.S. Pat. Nos. 4,356,716 and 4,836,004.
Document U.S. Pat. No. 4,356,716 describes and illustrates a bending press in which a C-shaped blade-holder is mounted for pivoting angularly by means of a rear arm, about an eccentric pin. The angular bending strokes are imparted to the blade-holder by one or more actuators which in turn are carried by an eccentric pin.
Adjustment of the angular position of the eccentric pin of the actuators enables the stroke of the blade-holder to be adjusted in a direction substantially perpendicular to the plane of the metal sheet, according to the degree of closure of the angle to be imparted to the bend; adjustment of the angular position of the eccentric pin on which the arm of the blade-holder is mounted moves the blade-holder towards or away from the blank-holder according to the thickness of the sheet metal to be bent and/or the angle to be given to the bend.
This known arrangement has the disadvantage of causing the blades to work in less than ideal conditions since, given the angular pivoting of the blade-holder, the working blade never remains parallel to itself during the bending operation as would, however, be desirable.
U.S. Pat. No. 4,836,004 describes and illustrates a bending press in which a C-shaped blade-holder body is mounted for sliding to and fro along an axis perpendicular to the plane of the metal sheet and its rear cooperates with a cam surface a central portion of which extends along the perpendicular axis and which has end portions curved towards the blank-holder. By virtue of this arrangement, the blade always works parallel to itself during the bending operation and moves towards the blank-holder towards the end of this operation to a greater or lesser extent according to the length of the stroke imparted along the axis perpendicular to the plane of the metal sheet. This permits the formation of bends with angles which are closed to a greater or lesser extent. However, since the cam surface cannot be modified except by the replacement of the entire cam, the ideal bending conditions corresponding to a given cam exist only for sheet metal of a particular thickness.
SUMMARY OF THE INVENTION
The object of the invention is to provide a bending press of the type in question in which the blade always remains parallel to itself during the bending operation but can be moved towards and away from the blank-holder in accordance with a programme which takes account both of the thickness of the sheet metal to be bent and of other characteristics of the sheet metal, for example, its ductility.
According to the invention, this object is achieved by means of a bending press as disclosed.
By virtue to this concept, it is possible to produce a bending press which can perform an almost infinite number of bending programmes, that is, an almost infinite number of working strokes of the blade relative to the counter-blade, in dependence on the thickness and other characteristics of the sheet metal. During these strokes, the blade always remains parallel to itself by virtue of the fact that its composite movements take place in accordance with only two perpendicular components, of which one is parallel and the other is perpendicular to the plane of the metal sheet.
These programmes can advantageously be performed by means of numerically-controlled actuators placed under the control of a programmable numerical control unit.
REFERENCES:
patent: 826807 (1906-07-01), Slaysman
patent: 2422042 (1947-06-01), Roberts
patent: 4411148 (1983-10-01), Aschauer
patent: 4520646 (1985-06-01), Pauzin
patent: 4658625 (1987-04-01), Koyama
patent: 4836004 (1989-06-01), Codatto
patent: 4843862 (1989-07-01), Salvagnini
patent: 4944176 (1990-07-01), Glorieux
patent: 5343727 (1994-09-01), Kabushiki et al.
patent: 42 06 417 (1993-09-01), None
Crane Daniel C.
Sughrue Mion Zinn Macpeak & Seas, PLLC
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