Browse Prior Art Database

Carrier Position Detection for a Printer

IP.com Disclosure Number: IPCOM000051605D
Original Publication Date: 1981-Feb-01
Included in the Prior Art Database: 2005-Feb-10
Document File: 2 page(s) / 44K

Publishing Venue

IBM

Related People

Dials, EN: AUTHOR [+3]

Abstract

Metering marks are printed or otherwise formed along the length of a ribbon for a printer. These marks are detected by a device located on the printhead carrier of the printer and serve to indicate carrier positions along a print line.

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Carrier Position Detection for a Printer

Metering marks are printed or otherwise formed along the length of a ribbon for a printer. These marks are detected by a device located on the printhead carrier of the printer and serve to indicate carrier positions along a print line.

Referring to Fig. 1, a printer includes a platen 10 that supports a receiving medium 12. A carrier 14 is supported by means such as a leadscrew 16 and a guide rod 18 to move along a printing axis parallel to the longitudinal axis of platen 10. Mounted on the carrier are a printhead 20, ribbon guide rollers 22 and a detector 24.

Ribbon 26 from a cartridge 28 extends around the printhead 20 and includes distance-indicating marks 30 (Fig. 2), such as a series of lines contrasting with the background ribbon surface. Such marks could also be magnetized spots on the ribbon which, for example, might include magnetizable material as a part of an ink coating.

The detector 24, which may be a light source/photocell combination, is positioned to detect the marks 30 and produces a signal S(D) representing distance increments. The signal S(D) is then processed in a similar manner to the emitter pulses for a typical electronic typewriter to identify carrier positions.

As an alternative, a detector 24' can be located near the take-up of cartridge
28. With this arrangement, grating movement past the detector occurs even for carrier movements where the ribbon is clamped to prevent movement over the printhead...