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Browse Prior Art Database

Daisywheel Printer With Shiftable Dual Row Printwheel

IP.com Disclosure Number: IPCOM000062029D
Original Publication Date: 1986-Oct-01
Included in the Prior Art Database: 2005-Mar-09
Document File: 2 page(s) / 81K

Publishing Venue

IBM

Related People

Habich, AB: AUTHOR [+2]

Abstract

Fig. 1 is an exploded view of the apparatus for rotating and shifting a printwheel. Fig. 2 is a more detailed view of the shift mechanism. In a daisywheel printer a printwheel 1 with flexible fingers, each containing two characters, is rotatably supported and driven around a shaft 4 supported by a shiftable housing arm 7. Housing arm 7 itself is rotatably fixed to shaft 10 of selection motor 11. A timing belt 12 guided over toothed pulleys 13 transmits the selection motion from selection motor 11 to printwheel driving hub 3. For tensioning the belt a spring 47, preferably a U-like or hairpin- like spring, is provided to urge the shafts apart and thus tension the belt 12.

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Daisywheel Printer With Shiftable Dual Row Printwheel

Fig. 1 is an exploded view of the apparatus for rotating and shifting a printwheel. Fig. 2 is a more detailed view of the shift mechanism. In a daisywheel printer a printwheel 1 with flexible fingers, each containing two characters, is rotatably supported and driven around a shaft 4 supported by a shiftable housing arm 7. Housing arm 7 itself is rotatably fixed to shaft 10 of selection motor 11. A timing belt 12 guided over toothed pulleys 13 transmits the selection motion from selection motor 11 to printwheel driving hub 3. For tensioning the belt a spring 47, preferably a U-like or hairpin- like spring, is provided to urge the shafts apart and thus tension the belt 12. A rack-and-pinion drive 35 is provided to shift the housing arm 7 in either of two positions in which either the inner 21 or outer 22 rows of characters is in print position P. Housing 7 also serves as a bearing retainer comprising two sidewalls that are arranged parallel and opposite to each other and that are rigidly connected by at least a third connecting wall. The sidewalls are provided with round cutouts that are arranged in pairs opposite each other and have a contour slightly larger than a half- circle. To transmit selection motion from the motor to the printwheel 1, each sidewall contains two equally distanced cutouts which are slightly larger than a semicircle to retain two pairs of bearings each carrying a toothed pulley in between....