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Carrier Homing Following Pitch Change

IP.com Disclosure Number: IPCOM000078621D
Original Publication Date: 1973-Feb-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

McBride, ME: AUTHOR [+2]

Abstract

In order to eliminate errors, a carrier in a processor controlled lead screw printer is homed following a pitch change, if the lead screw is not in the home rotational position. Homing is accomplished without regard to the position of the carrier relative to tab stop positions or set margins. The lead screw has an emitter wheel having a home opening, and a number of annular rows of emitter openings corresponding to different pitches. A repositionable detector is used for detecting the emitter openings. Changing pitch can cause the emitter detector to detect an emitter opening in a different row, and thereby result in a question as to the exact position of the carrier.

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Carrier Homing Following Pitch Change

In order to eliminate errors, a carrier in a processor controlled lead screw printer is homed following a pitch change, if the lead screw is not in the home rotational position. Homing is accomplished without regard to the position of the carrier relative to tab stop positions or set margins. The lead screw has an emitter wheel having a home opening, and a number of annular rows of emitter openings corresponding to different pitches. A repositionable detector is used for detecting the emitter openings. Changing pitch can cause the emitter detector to detect an emitter opening in a different row, and thereby result in a question as to the exact position of the carrier.

If the leadscrew is not in the home rotation position when pitch is changed, reverse escapement is initiated. When the home opening is detected by a home detector, forward escapement is initiated and continues until the home opening is again detected. The operator can thereafter reposition the carrier, as desired, through spacing and backspacing. An alternate approach is for forward escapement to be initiated and caused to continue until the home opening is detected. Again, the operator can reposition the carrier through spacing and backspacing.

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