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Roller Arrangement for Obtaining Slack Ribbon in a Printer

IP.com Disclosure Number: IPCOM000038968D
Original Publication Date: 1987-Mar-01
Included in the Prior Art Database: 2005-Feb-01
Document File: 2 page(s) / 46K

Publishing Venue

IBM

Related People

Rachui, RA: AUTHOR [+3]

Abstract

A method of achieving a slack ribbon condition in a QuietWriter-type printer when the print head hits the platen is described. The QuietWriter-type printer has a ribbon pinch brake arm mechanism 1 on the carrier to assure that the ribbon 2 is taut as it passes across the secondary ground shoe at the print head. This taut ribbon condition is necessary to obtain an adequate electrical ground path from the ribbon during printing. The arrangement is illustrated diagrammatically in Fig. 1. However, with a free-to-pivot elongated crown roller 4 on a guide post 3, slack can be generated in the ribbon at the time the head is brought into contact with the platen. As shown in Fig. 2, the ribbon 2, at rest, is located on the summit S of the roller 4.

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Roller Arrangement for Obtaining Slack Ribbon in a Printer

A method of achieving a slack ribbon condition in a QuietWriter-type printer when the print head hits the platen is described. The QuietWriter-type printer has a ribbon pinch brake arm mechanism 1 on the carrier to assure that the ribbon 2 is taut as it passes across the secondary ground shoe at the print head. This taut ribbon condition is necessary to obtain an adequate electrical ground path from the ribbon during printing. The arrangement is illustrated diagrammatically in Fig. 1. However, with a free-to-pivot elongated crown roller 4 on a guide post 3, slack can be generated in the ribbon at the time the head is brought into contact with the platen. As shown in Fig. 2, the ribbon 2, at rest, is located on the summit S of the roller 4. As the ribbon is fed past the print head and

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ribbon tension increases, the ribbon dynamically searches for the crest C of the roller 4. The crest of the roller 4 has the larger radius or distance away from the axis. During printing, the ribbon is running on the crest of the roller with the roller 4 at the top of the shaft 3. When the print head is retracted, slack in the ribbon occurs, allowing the roller to drop to the base of the shaft 3. The ribbon now is again on the summit of the roller 4, which produces extra ribbon when the print head is rotated forward during printing. The created extra ribbon allows slack in the ribbon as the print head is retur...