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Print Wheel Setup Mechanism

IP.com Disclosure Number: IPCOM000098750D
Original Publication Date: 1959-Dec-01
Included in the Prior Art Database: 2005-Mar-08
Document File: 2 page(s) / 70K

Publishing Venue

IBM

Related People

Berkman, JW: AUTHOR

Abstract

A print wheel 10 is driven by a print wheel gear 11 which is fixed concentrically to a pinion 12, the compound gear pair being rotatably mounted upon a shaft 13 journaled in an arm 14. The pinion 12 is meshed with internal teeth 15 on a sector 16. During numeric selection, the arm 14 is held against movement by a cam 17 while the sector 16 drives the print wheel 10 through the compound gear pair. The sector 16 is under control of a cam 18, a sector bail 19, and a spring 20. The characters on the print wheel 10 are disposed in groups of four, and each group is selected by means of a magnet, not shown, which operates a push rod 21 for actuating a latch, not shown. The latch, not shown, releases a pawl 22 for engaging teeth 23 formed in the sector 16.

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Print Wheel Setup Mechanism

A print wheel 10 is driven by a print wheel gear 11 which is fixed concentrically to a pinion 12, the compound gear pair being rotatably mounted upon a shaft 13 journaled in an arm 14. The pinion 12 is meshed with internal teeth 15 on a sector 16. During numeric selection, the arm 14 is held against movement by a cam 17 while the sector 16 drives the print wheel 10 through the compound gear pair. The sector 16 is under control of a cam 18, a sector bail 19, and a spring 20. The characters on the print wheel 10 are disposed in groups of four, and each group is selected by means of a magnet, not shown, which operates a push rod 21 for actuating a latch, not shown. The latch, not shown, releases a pawl 22 for engaging teeth 23 formed in the sector 16.

During zone time the cam 17 permits movement of the arm 14 to the right, and, since the sector 16 is held against movement at this time, the pinion 12 rolls relative to the sector 16 to turn the print Wheel 10 in an opposite direction to scan the group of four characters previously selected. The proper character is selected by impulsing the magnet to operate the push rod 21, the same having been laterally shifted by a shift bar 24 after numeric selection so as to be in position to actuate a latch 25 which, upon being operated, releases a pawl 26. The pawl 26, when released, engages teeth 27 formed in a curved member 28 projecting from the arm 14. With the print wheel 10 positioned, printing...