Stencil shifter

Details Stencil shifter Stencil shifter

1996-05-13

1998-03-10

Yan, Ren

Printing

Stenciling

Stencils

101114, B05C 1700

Patent

active

057248893

ABSTRACT:
A stencil shifter (800) for positioning a differential thickness stencil stencil (14' integrally formed from two sieves (601 and 602) having different thicknesses (701 and 702) for a two-stage solder printing process for printing the solder mask for a fine-pitch component alongside that of a larger component on the same side of a printed circuit board. This same stencil shifter (800) can also be used for a top and bottom side two-stage printing process. This two-stage printing process uses an integral stencil (814) having a plurality of sieves (801 and 802), the plurality of sieves including at least a first sieve (801) for paste stenciling a first side (191) of a board and a second sieve (802) for paste stenciling a second side (202) of the board. What side the board is facing is first determined by an optical sensor (193) and in response to the side detected, the integral stencil (814) is positioned to locate one of the pluralities of sieves over the board for printing that side.

REFERENCES:
patent: 3943851 (1976-03-01), Inada et al.
patent: 3945317 (1976-03-01), Brasa
patent: 4255226 (1981-03-01), Crofts et al.
patent: 5343802 (1994-09-01), Shimada
patent: 5517912 (1996-05-01), Winter
patent: 5553538 (1996-09-01), Freitag

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