Shaft positioning mechanism

Details Shaft positioning mechanism Shaft positioning mechanism

1974-06-06

1976-03-23

Scott, James R.

Electricity: motive power systems

Positional servo systems

With particular motor control system responsive to the...

318696, G05B 1940

Patent

active

039462986

ABSTRACT:
A rotatable shaft positioning mechanism is disclosed for use with a multiple spindle automatic machine tool having a plurality of rotatable spindles in an indexable spindle carrier. A Hall effect sensor is actuated by a permanent magnet rotating with each spindle to develop a reference signal which starts a counter counting pulse generated by a pulse generator connected to the output of a stepping motor. The stepping motor is connected to rotate the spindle and when the counter counts out, the spindle is stopped at the preset position. The spindle is held in place and the machine tool may be operated for performing a machining function on a workpiece held in the spindle, for example, a cross drilling attachment, cross-tapping attachment or alternatively, the spindle may be rotated at a slow speed by the stepping motor to perform a contouring or assembling operation on a workpiece in the spindle. The foregoing abstract is merely a resume of one general application, is not a complete discussion of all principles of operation or applications, and is not to be construed as a limitation on the scope of the claimed subject matter.

REFERENCES:
patent: 3586953 (1971-06-01), Markkanen
patent: 3605000 (1971-09-01), Inaba
patent: 3720865 (1973-03-01), Bregault
patent: 3760252 (1973-09-01), Beery
patent: 3766459 (1973-10-01), McIntosh
patent: 3777245 (1973-12-01), May

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