"Milepost" single-channel encoder, scale, and method, for midsca

Details "Milepost" single-channel encoder, scale, and method, for midsca "Milepost" single-channel encoder, scale, and method, for midsca

1993-09-17

1995-05-02

Coles, Sr., Edward L.

Typewriting machines

Control of print position along print-line by signal...

400322, B41J 2114, B41J 1930

Patent

active

054113407

ABSTRACT:
The encoder scale has features to be automatically read by a single-channel sensor of the device to determine position of a carriage that is part of the device and moves bidirectionally across the sheet. These features include a first group of many graduations formed in a single row along the substrate; and a second group of many graduations also formed in the same row along the substrate and interspersed among those of the first group over at least a distance that corresponds approximately to the full transverse dimension of the sheet. The scale also includes some provision for automatically distinguishing --by the single-channel sensor of the image-related device--between graduations of the first and second groups. This provision includes, for each graduation of the second group, some feature (such as width) that is distinctive in relation to the graduations of the first group. The invention also provides the image-related device, with the carriage operating bidirectionally to print or read image details onto or from the sheet, and with the encoder scale incorporated as well as a single-sensor subsystem for detecting the individual graduations of both sets--and also including a single-channel subsystem that makes use of the two groups of graduations for two distinct purposes, respectively.

REFERENCES:
patent: 3681773 (1972-08-01), Russell
patent: 4779348 (1988-10-01), Levy
patent: 4789874 (1988-12-01), Majette
patent: 5276970 (1994-01-01), Wilcox

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