초록 ▼

A numerically controlled transfer machine comprises a rotary index table having thereon a plurality of jig tables for holding workpieces, and a plurality of working units are disposed in spaced relation around the index table so that rotary indexing of the index table successively positions the jig

A numerically controlled transfer machine comprises a rotary index table having thereon a plurality of jig tables for holding workpieces, and a plurality of working units are disposed in spaced relation around the index table so that rotary indexing of the index table successively positions the jig tables opposite different ones of the working units. Each working unit includes a positioning feed mechanism for controlling the feeding and return movements of the working unit to enable a working operation to be carried out on the workpieces. Each working unit has a position detector comprised of a microswitch mounted on a slide member slidably mounted on the working unit. A biasing spring urges the slide member in the direction of return movement of the working unit and a stopper comes into contact with and actuates the microswitch during the course of return movement to thereby feed an origin reference signal to the positioning feed mechanism to effect positioning of the working unit at a preselected origin return position. In the event of continued return movement past the origin return position, the stopper comes into contact with and pushes the slide member against the force of the biasing spring thereby preventing damage to the microswitch.

대표청구항 ▼

In a numerically controlled transfer machine of the type having a plurality of movable working units each including a positioning feed mechanism for controlling the feeding and return movements of its corresponding working unit; and a rotary index table having mounted thereon a plurality of jig tabl

In a numerically controlled transfer machine of the type having a plurality of movable working units each including a positioning feed mechanism for controlling the feeding and return movements of its corresponding working unit; and a rotary index table having mounted thereon a plurality of jig tables for holding workpieces and operable in response to rotary indexing movement to successively position said jig tables at working stations opposite respective ones of said working units: a plurality of detecting means each coacting with an associated one of said working units for detecting when said working unit reaches a predetermined position during its course of return movement and providing an origin reference signal in response to such detection and applying the origin reference signal to the corresponding positioning feed mechanism to effect return positioning of said working unit to a preselected origin return position in readiness for the next feeding movement, each said detecting means including means for enabling movement thereof relative to its associated working unit after detection of said predetermined position to thereby prevent damage to said detecting means in the event of continued return movement of said working unit past said preselected origin return position.