Screen press with controlled stop geneva mechanism

Details Screen press with controlled stop geneva mechanism Screen press with controlled stop geneva mechanism

1986-07-11

1988-02-16

Crowder, Clifford D.

Printing

Stenciling

Multicolor

101129, 74436, B41F 1510

Patent

active

047247606

ABSTRACT:
A screen printing apparatus having a rotatable turret with a plurality of work supports is indexed by a curved geneva mechanism to each of a plurality of index positions. The curved geneva mechanism includes a plurality of curved slots having surfaces engaged by the driver with the curved slots designed to minimize the maximum amount of inertia and to maximize the available time for deceleration of the turret to provide a smoother and slower stopping of the turret and registration without banging and jarring of the apparatus. The preferred curved slots have a modified sine wave characteristic to provide slower changes in velocity during the stopping. The amount of inertia change during the indexing motion is analyzed and the curved slots are generated to eliminate abrupt changes in inertia that would result in a rough movement.

REFERENCES:
patent: 2512894 (1950-06-01), Gieskieng
patent: 4099460 (1978-07-01), Bubley et al.

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