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Compensation for Scraped Portion of Resistive Ribbon Used in Printer or Typewriter

IP.com Disclosure Number: IPCOM000059893D
Original Publication Date: 1986-Feb-01
Included in the Prior Art Database: 2005-Mar-08
Document File: 2 page(s) / 13K

Publishing Venue

IBM

Related People

Dyer, S: AUTHOR [+2]

Abstract

To maintain the same quality print when using a scraped portion of a resistive ribbon for printing in a printer or typewriter, current is increased when using the scraped portion of the resistive ribbon for printing. When printing with a resistive ribbon, a thermal printhead has electrodes heating material of the ribbon for transfer to a sheet of paper. The printhead is mounted on a carrier with the carrier moving in one direction and the ribbon being fed in the opposite direction past the printhead. After the ribbon passes the electrodes, the ribbon is scraped by the printhead, but this scraping does not affect the quality of print since printing has occurred before scraping.

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Compensation for Scraped Portion of Resistive Ribbon Used in Printer or Typewriter

To maintain the same quality print when using a scraped portion of a resistive ribbon for printing in a printer or typewriter, current is increased when using the scraped portion of the resistive ribbon for printing. When printing with a resistive ribbon, a thermal printhead has electrodes heating material of the ribbon for transfer to a sheet of paper. The printhead is mounted on a carrier with the carrier moving in one direction and the ribbon being fed in the opposite direction past the printhead. After the ribbon passes the electrodes, the ribbon is scraped by the printhead, but this scraping does not affect the quality of print since printing has occurred before scraping. When a print cycle ends, such as after each character when a typist is typing on a typewriter or at the end of a line or a tab when a printer is printing in a slew mode, the carrier continues for a slight additional distance before stopping, and the printhead is withdrawn from its print position to an intermediate position. During this time interval, the ribbon continues to be fed past the printhead, and this is the portion of the ribbon that is scraped before it is used for printing. Before printing again occurs, the carrier is returned to the position at which the next character is to be printed and the ribbon is rewound so that the scraped portion of the ribbon is employed for printing. The use of the same current with the scraped portion of the ribbon results in light printing. Therefore, to obtain quality print, current should be increased for only the length of the scraped portion of the ribbon. The length of the scraped portion of the ribbon depends on the time interval for the printhead to be moved from its print position to its intermediate position and the velocity of the carrier during this time interval...