Browse Prior Art Database

Typehead Carrier Clamp

IP.com Disclosure Number: IPCOM000078480D
Original Publication Date: 1973-Jan-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 3 page(s) / 41K

Publishing Venue

IBM

Related People

Rhodes, JH: AUTHOR

Abstract

Carrier clamp 10 clamps typehead carrier 40 to front rail 50 immediately before printing, and releases carrier 40 from engagement with rail 50 after printing occurs. The positive engagement of carrier 40 to rail 50 during printing reduces smear, ticking, varying color, and horizontal alignment problems of typehead 60 relative to paper 70 and platen 80.

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Typehead Carrier Clamp

Carrier clamp 10 clamps typehead carrier 40 to front rail 50 immediately before printing, and releases carrier 40 from engagement with rail 50 after printing occurs. The positive engagement of carrier 40 to rail 50 during printing reduces smear, ticking, varying color, and horizontal alignment problems of typehead 60 relative to paper 70 and platen 80.

Print shaft 41 rotates 360 degrees during the cycle of printing one character. Rotatably mounted in carrier 40 is print sleeve 42 which is keyed for slidable engagement with print shaft 41. Energy for moving typehead 60 during printing is transmitted through shaft 41 and sleeve 42 through a typehead actuating mechanism in carrier 40, not shown, and then to typehead 60.

Carrier clamp cam 43 is rigidly mounted to print sleeve 42. Carrier clamp 10 pivots about shouldered screw 11. Protrusion 12 of clamp 10 is biased into engagement with cam 43 by the tension in spring 19. Cam 43 is radially aligned with print sleeve 42 so that low-dwell surface 45 of cam 43 has rotated clockwise, adjacent to protrusion 12, when typehead 60 impacts paper 70 during printing. When protrusion 12 is adjacent to surface 45, carrier clamp 10 has rotated clockwise around screw 11 so that shoe 13 of lower carrier arm 14 is in positive engagement with surface 51 of rail 50. After printing is completed, cam 43 has rotated with sleeve 42 and shaft 41 so that high dwell surface 44 of cam 43 moves protrusion 12 and clamp 10 out of engagement with rail 50, allowing escapement of carrier 40 along shaft 41.

Clamp 10 includes arm 14, middle clamp arm 15, and upper clamp arm 16. Arm 15 is tapped to receive screw 17 for fixedly mounting arm 16 to arm 15. Slot 18 permits adjustment of th...