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Browse Prior Art Database

Low Speed Reverse Ribbon Drive Mechanism

IP.com Disclosure Number: IPCOM000096394D
Original Publication Date: 1963-May-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 49K

Publishing Venue

IBM

Related People

Hasegawa, T: AUTHOR

Abstract

Ink ribbon 10 for a printer is reversibly fed between ribbon spools 11 and 12. Spools 11 and 1 2 are each drivingly connected through a one-way clutch to its respective motor and gear drive 13. To feed in one direction, the drive for spool 11 is energized while the drive for spool 12 is de-energized. The rotation of driven spool 1 1 applies tension to ribbon 10 which declutches spool 12 from its drive. A pair of tabs 14 (only one of which is shown) is carried by ribbon 10 and operate switches 15 and 16 to energize and de-energize the corresponding drives 13.

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Low Speed Reverse Ribbon Drive Mechanism

Ink ribbon 10 for a printer is reversibly fed between ribbon spools 11 and 12. Spools 11 and 1 2 are each drivingly connected through a one-way clutch to its respective motor and gear drive 13. To feed in one direction, the drive for spool 11 is energized while the drive for spool 12 is de-energized. The rotation of driven spool 1 1 applies tension to ribbon 10 which declutches spool 12 from its drive. A pair of tabs 14 (only one of which is shown) is carried by ribbon 10 and operate switches 15 and 16 to energize and de-energize the corresponding drives 13.

The drive and clutch mechanism for each spool are identical. Thus, only one one-way clutch mechanism and drive is described. Spool 12 is rotatably supported by plate 17 having hub portion 18 rotatable on drive shaft 19. Pin 20 connects platform 17 to spools 11 and 12. Below hub 18 collar 21 is fixed to shaft 19 for rotation with it and which slidingly supports external sleeve 22. Clutch spring 23 is wound in a first direction on the outer peripheries of collar 21 and hub 18 and has its one end secured in notch 24 of sleeve 22. Declutch spring 25 is wound in an opposite sense on the outer periphery of sleeve 22 and has its one end anchored by peg 26 to stationary frame 27.

When drive 13 for spool 12 is energized, it rotated counterclock-wise to tighten spring 23 on collar 21 and hub 18. At the same time, sleeve 22 begins to turn with collar 21 causing spring 25 to unwin...