Angular indexing mechanism for orienting workpiece

Details Angular indexing mechanism for orienting workpiece Angular indexing mechanism for orienting workpiece

1976-01-22

1979-12-11

Chandler, Lance

Machine element or mechanism

Rotary member or shaft indexing, e.g., tool or work turret

With means to axially shift shaft

74813C, B23Q 1718

Patent

active

041776968

ABSTRACT:
An indexing mechanism in which a workpiece to be machined by a tool is attachable to the end of a rotatable spindle that is driven by the reversible motor of a servomechanism to assume a desired angular position. Mounted on the spindle and rotatable therewith is one gear of a multiple-tooth face gear coupling pair, the second gear of which is axially advanced by a motor along the spindle into and out of meshing engagement with the first gear. The second gear is non-rotatable and acts, when in mesh with the first gear, to prevent rotation of the spindle and thereby lock the angular position of the workpiece. In order to effect precise indexing, a sensor is provided to detect the point at which the second gear is slightly shy of full intermesh with the first gear, the sensor generating a signal which is applied to the servomechanism for the spindle to initiate a multicycle jiggling action in each cycle of which the drive motor is momentarily reversed in direction to slightly turn the first gear and to permit the second gear to effect an incremental advance, the number of cycles being sufficient to bring about full intermesh of the coupling pair.

REFERENCES:
patent: 3552242 (1971-01-01), Morgan, Jr. et al.
patent: 3653282 (1972-04-01), Bouffiou et al.
patent: 3717912 (1973-02-01), Lahm
patent: 3718055 (1973-02-01), Maier
patent: 3795155 (1974-03-01), Price et al.

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