Electricity: motive power systems – Positional servo systems – With particular 'error-detecting' means
Patent
1997-03-17
2000-10-17
Ro, Bentsu
Electricity: motive power systems
Positional servo systems
With particular 'error-detecting' means
318564, 318602, 318608, 318652, 400705, B41J 2942
Patent
active
061337064
ABSTRACT:
In accordance with the described invention, a stepper motor that drives a printer's movable subsystem, e.g. a sled-mounted ink-jet service station, is replaced with a less expensive and quieter DC motor, and continuous positional feedback is obtained via a fixed subsystem-mounted optical sensor array in cooperation with a movable subsystem-mounted code strip that includes a home-position encoding region. The code strip produces in the optical sensor array, in reflective response to a fixed subsystem-mounted light source, a plurality of modulated signals as the substantial extent of the code strip passes by, thereby enabling positional tracking of the movable subsystem's motion, and produces a secure home-position identification signal set when the homing patch is in the `view` of the array. The printer's controller thus can cause the DC motor to move the movable subsystem to its home position relative to a fixed subsystem without running into a hard stop, and the printer's cost is reduced without compromising positional accuracy.
REFERENCES:
patent: 3838250 (1974-09-01), Naas et al.
patent: 4208137 (1980-06-01), Liu
patent: 5664222 (1997-09-01), Inakoshi
Hewlett--Packard Company
Ro Bentsu
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