Apparatus for positioning a typing disk in a printing device

Details Apparatus for positioning a typing disk in a printing device Apparatus for positioning a typing disk in a printing device

B - Operations, Transporting

41

J

197/43

B41J 7/34 (2006.01) B41J 1/24 (2006.01) G05B 19/39 (2006.01)

Patent

CA 1175376

ABSTRACT OF THE DISCLOSURE An apparatus for positioning a typing disk in a printing device such as a teleprinter has a stepping motor having a rotary field which is operated by control circuitry so as to simulate a commutator-controlled direct current motor. The typing disk is driven by the stepping motor and is positioned by the operation of a digital coarse control loop and a post-connected analog precision control loop. The drive shaft of the stepping motor is also con- nected to a timing disk which operates in combination with an optical position transmitter to provide signals to the control loops representing incremental angular position changes.

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