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Bi-Directional Ribbon Drive Mechanism

IP.com Disclosure Number: IPCOM000037402D
Original Publication Date: 1989-Jan-01
Included in the Prior Art Database: 2005-Jan-29
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Semple, WE: AUTHOR [+2]

Abstract

This mechanism provides a bi-directional ribbon drive without a clutch assembly. This bi-directional drive mechanism may also be modified to a uni-directional ribbon drive simply by removing one of the gears of the mechanism.

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Bi-Directional Ribbon Drive Mechanism

This mechanism provides a bi-directional ribbon drive without a clutch assembly. This bi-directional drive mechanism may also be modified to a uni- directional ribbon drive simply by removing one of the gears of the mechanism.

Turning first to Figure 1, gear 1 is the input gear and it rotates about shaft 5. Gear 4 is the output gear which rotates about shaft 8. Gears 2 and 3 are idler gears. Idler gears 2 and 3 have large diameter center holes which allow them to rotate and translate about their much smaller diameter posts 6 and 7. As shown in Figure 1, when the input gear 1 turns clockwise, the output gear 4 also turns clockwise. Turning now to Figure 2, however, when the input gear 1 reverses direction, gear 2 translates out of contact with gear 4 about post 6, causing gear 3 to translate about post 7 and contact gear 4. As in Figure 1, therefore, gear 4 still rotates in a clockwise rotation despite gear 1's reverse rotation.

This drive mechanism can be easily adapted so that it is a uni-directional system where the output gear only rotates when the input gear rotates in a specific direction. By removing gear 3 and post 7, the clockwise rotation of gear 1 still engages gear 2 to drive gear 4 in the clockwise rotation (Figure 3). Reversing the input of gear 1, however, causes gear 2 to disengage from gear 4. Therefore, there will be no output when gear 1 is driven in the reverse rotation (Figure 4).

Depending upon orientatio...