Typewriting machines – Means auxiliary to typewriting function – Indicator means
Patent
1996-12-05
1999-06-29
Bennett, Christopher A.
Typewriting machines
Means auxiliary to typewriting function
Indicator means
400104, 400568, 4006131, 4007071, 400902, B41J 1142
Patent
active
059158654
ABSTRACT:
An apparatus and method for controlling operation of a printer enables the transport rate of the print media to be coordinated with the print rate in order to precisely compensate for top-of-form and image stretch errors. The printer comprises a platen roller driven by a stepper motor to transport the print media in step increments. A print head is disposed in proximity to the platen roller so that the print media is transported therebetween by operation of the platen roller and step motor. A step rate control circuit for the printer comprises a clock adapted to provide a series of regular clock pulses at a fixed rate, and a first and a second counter respectively coupled to the clock for counting the clock pulses. The first counter provides a first interrupt signal with each of a first number of clock pulses which is provided to the stepper motor to cause the print media to be advanced by one step. The second counter provides a second interrupt signal with each of a second number of clock pulses which is provided to the print head to activate the printing of a line of information onto the print media. By selecting the first number and the second number, the printer can provide optimum registration of the printed information to the print media.
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Bennett Christopher A.
Intermec IP Corp.
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