| 摘要 |
A rotary indexing mechanism for a screen printing machine of the type comprising a carousel (10) which includes a multiple armed fixed frame (12) and a multiple armed movable frame (20) mounted to rotate relative thereto, a plurality of print heads mounted to one of the frames and a plurality of screen platens mounted to the other of the frames. The rotary indexing mechanism includes a coupling member (37) mounted for reciprocatory rotary motion, and including engagement means (36) operable to engage the movable frame (20) during a selected portion of the reciprocatory rotary motion, drive means (40) including a linear actuator (40a, 40b, 40c) for effecting said reciprocatory rotary motion, a transmission mechanism (55) operatively connecting the drive means (40) to the coupling member (37) and, fluid damper means (42) mounted so as to oppose the reciprocatory rotary motion of the coupling member (37). In one form the transmission means includes two racks (60, 61) one connected to the drive means (40) and the other connected to the fluid damper means (42). In another form the transmission means includes a crank (64) rotatable by the drive means (40) with a pin (65) receivable in a slot (69) in the coupling member (37). |
