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Browse Prior Art Database

Enhanced Printing

IP.com Disclosure Number: IPCOM000089644D
Original Publication Date: 1977-Dec-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 3 page(s) / 76K

Publishing Venue

IBM

Related People

Weber, CJ: AUTHOR

Abstract

Enhanced printing involves printing that looks like a selected particular type font, and requires that the print head make two passes of print for each line of characters. It also requires that the second-pass dots be interleaved with the first-pass dots, thereby producing enhanced printing.

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Enhanced Printing

Enhanced printing involves printing that looks like a selected particular type font, and requires that the print head make two passes of print for each line of characters. It also requires that the second-pass dots be interleaved with the first-pass dots, thereby producing enhanced printing.

Referring to Fig. 1, as the print head (not shown) moves, it passes over a print emitter board 1 that has real emitter segments spaced at .010''. This produces an emitter pulse every 1.666 milliseconds when the print head is moving at 6'' per second. For enhanced printing it is necessary to generate two false emitter pulses between each real emitter pulse so that a print dot can be printed every .0033'', or every 555 microseconds when measured in time.

A print wire can only be fired every 1.666 milliseconds, but one wire can be fired on a real emitter pulse. Then, with a false emitter pulse, another wire can be fired as soon as 555 microseconds later.

The real emitter pulses are generated by the print head passing over the emitter board 1. The false emitter pulses are generated by an associated microprocessor. An emitter counter (EMCT) counts both the real and false emitter pulses. A false emitter counter (FECT) indicates which emitter pulse is present, real or false, and which of the two false emitter pulses the microprocessor is acting on. The false emitter pulses are generated only while printing is enabled.

When doing enhanced printing, it is necessary to know and remember on which emitter pulse the last printing operation was performed, when the print head was moving right. This is to ensure that printing will begin at this emitter location when the print head is moving left.

An algorithm is provided to control the operation under all circumstances.

Fig. 2a represents the FECT operation over a predetermined time span. Fig. 2b represents the real and false emitters, and the EMCT from the left margin, where printing starts, to the right margin, where the print head is stopped, over the same time span.

Both EMCT and FECT are incremented (moving right) or decremented (moving left) ju...