Browse Prior Art Database

Damped Bail Closing

IP.com Disclosure Number: IPCOM000042862D
Original Publication Date: 1984-Jun-01
Included in the Prior Art Database: 2005-Feb-04
Document File: 2 page(s) / 48K

Publishing Venue

IBM

Related People

Kroeker, EB: AUTHOR

Abstract

This article describes apparatus for providing automatic damped bail closure within one index of platen motion in a high speed printer or the like. Damped bail motion is desirable for reducing marking on the print sheet and for reducing noise. In the figure, platen 2 is provided with a gear hub 4 for platen gear 6. Platen gear 6 is on a common center with platen 2 and hub 4. Springs 8 bias platen gear 6 counterclockwise against gear hub 4. As platen 2 turns clockwise, platen gear hub 4 also turns clockwise and drives platen gear 6 in the same direction. This action engages gear 10 including an integral cam, and drives it counterclockwise. Paper bail roller 12 is mounted at one end of arm 14 which is pivotally mounted to frame 18.

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Damped Bail Closing

This article describes apparatus for providing automatic damped bail closure within one index of platen motion in a high speed printer or the like. Damped bail motion is desirable for reducing marking on the print sheet and for reducing noise. In the figure, platen 2 is provided with a gear hub 4 for platen gear 6. Platen gear 6 is on a common center with platen 2 and hub 4. Springs 8 bias platen gear 6 counterclockwise against gear hub 4. As platen 2 turns clockwise, platen gear hub 4 also turns clockwise and drives platen gear 6 in the same direction. This action engages gear 10 including an integral cam, and drives it counterclockwise. Paper bail roller 12 is mounted at one end of arm 14 which is pivotally mounted to frame 18. A bail follower 16 is made integral with arm 14 and tracks the surface of the cam on gear 10, causing bail roller 12 to move into and out of engagement with platen 2. Movement of platen 2 is stopped when follower 16 is on the close or down side of the cam surface. Follower 16 urges gear 10 counterclockwise. This motion urges platen gear 6 clockwise ahead of platen gear 4, extending springs 8. Thus, the paper bail and its roller 12 close on platen 2 in a damped manner. After bail closure, platen 2 continues clockwise rotation and platen gear hub 4 again contacts platen gear 6. Springs 8 return to rest in their original biased state.

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