Workpiece support and clamping means

Details Workpiece support and clamping means Workpiece support and clamping means

1992-02-04

1992-10-20

Wintercorn, Richard A.

Photocopying

Projection printing and copying cameras

Detailed holder for photosensitive paper

355 53, G03B 2758

Patent

active

051574381

ABSTRACT:
Support means for a workpiece, such as for example a printed circuit board to be screen printed, comprise a plurality of parallel upright elongate members, upper ends of which engage the underside of the workpiece or components secured thereon. Armatures and electromagneto magnets are provided in a housing selectively to clamp the elongate members in a raised position or allow them to fall to a lowered position.
Clamping means to clamp the workpiece comprise clamping plates on opposite sides of the workpiece and having very thin foils projecting laterally therefrom over the workpiece and operating means to lower or raise the clamping plates to clamp or release the workpiece.

REFERENCES:
patent: 3670394 (1972-06-01), Daniels et al.
patent: 4278348 (1981-07-01), Funk et al.
patent: 4666291 (1987-05-01), Taniguchi et al.
patent: 4788577 (1988-11-01), Akiyama et al.

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