Browse Prior Art Database

Color Ribbon Shift Mechanism

IP.com Disclosure Number: IPCOM000059924D
Original Publication Date: 1986-Feb-01
Included in the Prior Art Database: 2005-Mar-08
Document File: 2 page(s) / 89K

Publishing Venue

IBM

Related People

Stoyer, RD: AUTHOR

Abstract

In a printer, a color ribbon is shifted, to any one of multiple discrete color bands, by incremental movement of a ribbon shield. This requires fewer parts than known mechanisms that shift or tilt the ribbon cartridge. Fig. 1 shows ribbon shield 1 interposed between print head 2 and platen 3. It is moveable in a curved path, guided by pins 4 engaged in internal slots in print head frame 5. The ribbon shield is moved to the desired position by ribbon shift rack 6 which snaps into the lower end of ribbon shield 1 at point 7. Ribbon shift rack 6 is driven by ribbon shift gear 8, which is driven by a stepper motor. Positive positioning of ribbon shield 1, for each of its color bands, is provided by detent 9 seating in one of the low dwells 10 on the internal surface of ribbon shift rack 6.

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Color Ribbon Shift Mechanism

In a printer, a color ribbon is shifted, to any one of multiple discrete color bands, by incremental movement of a ribbon shield. This requires fewer parts than known mechanisms that shift or tilt the ribbon cartridge. Fig. 1 shows ribbon shield 1 interposed between print head 2 and platen 3. It is moveable in a curved path, guided by pins 4 engaged in internal slots in print head frame 5. The ribbon shield is moved to the desired position by ribbon shift rack 6 which snaps into the lower end of ribbon shield 1 at point 7. Ribbon shift rack 6 is driven by ribbon shift gear 8, which is driven by a stepper motor. Positive positioning of ribbon shield 1, for each of its color bands, is provided by detent 9 seating in one of the low dwells 10 on the internal surface of ribbon shift rack 6. Detent 9 is provided with detent spring 11. Fig. 2 shows that this embodiment is for a ribbon with four color bands 12. Referring to Fig. 1, it is seen that there are four corresponding low dwells 10 in ribbon shift rack 6. The mechanism is shown with the ribbon shield in its uppermost position, to permit printing with the lowest color band.

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