Geometrical instruments – Miscellaneous – Light direction
Reexamination Certificate
1999-04-20
2001-06-05
Gutierrez, Diego (Department: 2859)
Geometrical instruments
Miscellaneous
Light direction
C033S0010DD, C033S534000, C033S538000, C033S549000
Reexamination Certificate
active
06240646
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Technical Field
The invention refers to a device for measuring angles, in particular for measuring angles that occur when bending sheet metal and similar material by means of press brakes and other bending devices.
2. Description of the Prior Art
It is known to arrange a displaceable feeler pin at the die of a press brake in the direction of pressing where the feeler pin affects an electronic position detector as the sheet is bent so that a value of the angle of bending is obtained.
A device is known from EP 0 594 532 where a plate mounted for rotation with a detecting edge positioned along a chord is turned under the influence of a sheet bent against a die whereby the rotated position gives the degree of bending. A common factor of known detectors of the latter type is that the rotating element, plates and similar, must have a defined axis that is positioned in a specified relation to the radius over which the bending takes place in order for a secure measurement to be obtained. With other types of devices, one has tried to solve this problem by ensuring good contact fit by allowing some kind of spring mechanism to press the actual detector against the piece being worked. In addition to these known devices often giving an uncertain result, they can only be used together with a specific die set, which means that one is forced to stock an angle measuring mechanism for each die set.
THE OBJECTIVE OF THE INVENTION
The objective of the invention is to achieve a new measuring device that can be used together with a range of different die sets, that is essentially independent of the position of the axis or line over which the bending takes place, and that eliminates the risk of error when transferring data between the detection unit and the registration unit.
SUMMARY OF THE INVENTION
The device according to the invention, whereby there is at least one device arranged on each side of the lower pressing tool, includes a rocker with an abutment edge that can be displaced at right angles to the axis of the rocker by means of a rod that is displaceable in an axial direction. The rod can be displaced obliquely against the direction of movement of the upper pressing tool towards the lower pressing tool, whereby the displacement takes place from the outer side of the sheet whose angle is to be measured. A sensing edge of the rocker is arranged to be brought in contact with the outside or the underside of the sheet or the piece being worked.
The lower pressing tool part, or die, supports the sheet along its radius or edges and the upper pressing tool is arranged to press the sheet between the two, whereby the parts of the plate, or the work piece, that are outside of or beyond the radii or edges are swung upwards.
During measurement, the pivoting axis of the rocker, which is parallel with the longitudinal direction of the press brake, is displaced upwardly beyond the radius of bending or the bending edge at the lower pressing tool. The sensing edge of the rocker is moved to abut the outside or the underside of the sheet. The angular position of the rocker, which gives the bending angle, is detected by means of a directly connected detector mechanism, such as a rotating potentiometer.
The device designed as one single unit together with the rocker, rod, the operating mechanism for same, and a support part is located in a housing that can be attached to various tools with the help of an attachment mechanism.
REFERENCES:
patent: 4571834 (1986-02-01), Fraser et al.
patent: 4766675 (1988-08-01), Liu
patent: 5148693 (1992-09-01), Santorio et al.
patent: 5285668 (1994-02-01), Tokai
patent: 5375340 (1994-12-01), Gerritsen
patent: 5483750 (1996-01-01), Ooenoki et al.
patent: 5603236 (1997-02-01), Hongo
patent: 0 594 532 (1997-04-01), None
patent: 8105266 (1983-06-01), None
Åström Rickard
Brännström Ingemar
Ronnmark Ulf
DeJesus Lydia M.
Gutierrez Diego
Pullmax Ursviken AB
Ware Fressola Van der Sluys & Adolphson LLP
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