Means for producing a dual acceleration-deceleration movement for a transfer shuttle

摘要

A transfer shuttle is alternately moved in a forward motion and then a rearward motion by a rotary power drive. As the rotary power drive is rotated through an arc of 180 DEG , a dog, coupled to the power drive, is accelerated and then decelerated before engaging the work piece transfer member, and then accelerated and decelerated after engaging the transfer member to complete its forward motion.