Apparatus for indexing an origin of a moving member

Details Apparatus for indexing an origin of a moving member Apparatus for indexing an origin of a moving member

1988-05-16

1990-01-30

Shoop, Jr., William M.

Electricity: motive power systems

Positional servo systems

With particular motor control system responsive to the...

318696, 400903, 400322, 360 7813, G05B 1940

Patent

active

048975893

ABSTRACT:
Disclosed herein is an origin indexing apparatus applicable to a printer. A moving member, such as a printing head mounted on a carriage, is moved by a stepper motor which rotates in stepwise fashion by sequentially changing excited phase by a predetermined number K. An initially set origin of such a moving member is exactly indexed or identified in a later origin indexing operation according to the relationship between the phase difference between excited phases of the stepper motor at the time of initial setting of the origin and the origin indexing operation and the number of phases K of the stepper motor. One of three positions is indexed as the origin based upon this relationship, including a center position corresponding to a subsequent specified phase appearing in the same cycle following the indexed excited phase, and positions downstream and upstream of the center position.

REFERENCES:
patent: 4394696 (1983-07-01), Yoshimaru
patent: 4602882 (1986-07-01), Akazawa
patent: 4633346 (1986-12-01), Sasaki et al.
patent: 4669900 (1987-06-01), Miyake et al.
patent: 4706008 (1987-11-01), Cronch et al.
patent: 4707649 (1987-11-01), Konemura
patent: 4714361 (1987-12-01), Yamakawa et al.

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