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All-Points-Addressable Printing With a Resistive Ribbon

IP.com Disclosure Number: IPCOM000061223D
Original Publication Date: 1986-Jul-01
Included in the Prior Art Database: 2005-Mar-09
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Liu, YC: AUTHOR [+4]

Abstract

A thermal printer, which has a resistive ribbon and prints predefined characters and graphic symbols from font modules through selectively energizing electrodes arranged in a column for transferring heat to the ribbon, can be used for all-points-addressable (APA) printing through controlling when each of the print electrodes may be activated during various passes of the electrodes along the same printed line relative to the recording medium. A thermal printer having forty electrodes, which are spaced on 1/240" centers arranged in a column, may be utilized to print graphics supplied from eight bits of data and previously used with a printer having nine electrodes spaced on 1/72" centers.

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All-Points-Addressable Printing With a Resistive Ribbon

A thermal printer, which has a resistive ribbon and prints predefined characters and graphic symbols from font modules through selectively energizing electrodes arranged in a column for transferring heat to the ribbon, can be used for all- points-addressable (APA) printing through controlling when each of the print electrodes may be activated during various passes of the electrodes along the same printed line relative to the recording medium. A thermal printer having forty electrodes, which are spaced on 1/240" centers arranged in a column, may be utilized to print graphics supplied from eight bits of data and previously used with a printer having nine electrodes spaced on 1/72" centers. To simulate the eight data bits into forty electrodes to obtain an equivalent dot size, the vertical mapping is defined as follows:

(Image Omitted)

When printing from these eight bits by selectively energizing the electrodes 8-33, the graphics mode is accomplished by passing the printhead twice over each printed line with alternate pairs of the electrodes being capable of energization during a pass. Each of the electrodes may be activated for energization only during one pass for printing a specific line. The two-pass printing may be as follows:

(Image Omitted)

With high resolution graphics modes, all of the forty electrodes can be utilized for printing. The APA printing in this mode is accomplished by passing the printhead ...