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Momentary Stop Action for Print Wheel

IP.com Disclosure Number: IPCOM000094956D
Original Publication Date: 1965-Jul-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 56K

Publishing Venue

IBM

Related People

Hickerson, JE: AUTHOR

Abstract

The mechanism provides a momentary stop and restoring action for an in-flight print wheel to prevent smudging of characters.

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Momentary Stop Action for Print Wheel

The mechanism provides a momentary stop and restoring action for an in- flight print wheel to prevent smudging of characters.

Motor 1 drives timing commutator 2 and print wheel 3 through spring 4 connected to drive disk 5. Print wheel 3 has eight characters evenly spaced around its periphery, such as characters H and C. Eight stop teeth 6 are provided in print wheel 3, one for each character position. Additional characters and associated stop teeth can be provided, depending on requirements. A knock-off disk 7 has eight pins 8, one for each character position. Print wheel 3 rotates past print hammer 9, paper 10, and ribbon 11.

An individual character is selected for printing by firing hammer 9 under control of commutator 2 as print wheel 3 moves in the direction indicated by arrow 12. Concurrently with the selection of a character, magnet 13 is energized and pulls armature 14 to release stop pawl 15 for clockwise movement about pivot 16. Extension 15a of pawl 15 moves into engagement with the tooth 6 corresponding to the character selected and momentarily stops print wheel 3. Disk 5 continues driving and stretches spring 4 by movement of stud 17 in slot
18. Shortly after printing of the selected character, pawl 15 is positively restored by one of the pins 8 striking extension 15b of pawl 15. Spring 4, expanded while print wheel 3 is stopped, now contracts and pulls print wheel 3 back into synchronization with disk 5.

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