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AssigneeInternational Business Machines Corporation
InventorsGordon T. Davis, Wolfgang Mueller, Lawrence P. Remsen, Alfred A. Stricker
Estimating the term…
A horizontally movable slide bears a two section, continuously extending horizontally inclined, steep and shallow sloped cam slot controlling the vertical rise and fall of a cam follower driven support fixture for supporting a ceramic green sheet in underlying contact with a stencil mask in an automatic MLC screening machine. An apertured positioning flag moves horizontally with the slide and past a vertical height digital position encoder assembly and a mask separate encoder assembly. The positioning encoder assembly provides an electrical signal for controlling an actuator mechanism causing slide movement, indicative of the desired final positioning height of the green sheet relative to the mask when the fixture is moving towards the mask. When the actuator mechanism drives the slide in the opposite direction, to lower the green sheet from the mask, the mask separate encoder assembly produces a signal, in response to common positioning flag movement in the opposite direction with the slide to effect a change in speed of the actuator mechanism. This provides slow initial separation of the green sheet from the mask and final removal of the fixture from screening height, at a much more rapid rate.
In a screening machine for screening conductive material through a stencil mask and onto an underlying ceramic green sheet, said machine including a green sheet support fixture for supporting said ceramic green sheet for movement vertically toward and away from said stencil mask, an actuator mechanism for causing mechanical movement, a movable drive mechanism operatively coupling said actuator mechanism to said green sheet support fixture for moving the green sheet support fixture into and out of screening position immediately underlying said stencil mask, the improvement comprising:
Dependencies are inferred from the claim text.