Screen press with controlled stop geneva mechanism

In a screen printing apparatus, the combination comprising:

• a rotatable turret having a plurality of work supports carried thereon at predetermined equal distances from a central rotational axis for said turret for indexing to each of a plurality of index positions,
• screen printing means at each of a plurality of index positions for successively printing on the work carried by said supports,
• motor means for turning the rotatable turret about said rotational axis and through its indexing movements,
• register menan to register the turret at each of the index positions for registration of successive impressions on the work,
• a Geneva mechanism for rotating the turret about said rotational axis comprising a driver driven by said motor means and an indexer connected to said turret, and
• said indexer having a plurality of curved slots therein having surfaces engaged by said driver, said curved slots having a complex, non-radius shape minimizing the maximum inertia and maximizing the available time for deceleration of the rotatable turret, said curved slots having surfaces engaged by said driver to rotate said indexer through a distance different than fifty percent of its angular travel during the driver's inward travel into one of siad curved slots, said driver displacing said indexer and generating a motion in the rotatable turret during its deceleration having the characteristics of a modified sine form, said indexer movable through a distance different than fifty percent of its angular displacement during the outward travel of said driver in said curved slot so that the indexer may decelerate slowly as it moves into a stop position.