Browse Prior Art Database

Carrier Transportation System

IP.com Disclosure Number: IPCOM000075842D
Original Publication Date: 1971-Nov-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 45K

Publishing Venue

IBM

Related People

Abell, WA: AUTHOR [+2]

Abstract

A typewriter having a moveable type element carrier 10 and escapement system, therefor, like that described in U. S. patent 3,126,998, is provided with a selectively operative bidirectional bias from motor 11 acting through friction clutch 12. Clutch 12 drives shaft 13 in the direction of arrow 14. A pair of spaced sprocket members, 15 and 16 mounted on shaft 13 by suitable bearings, permit relative movement therebetween. The sprocket members 15 and 16 have respective inwardly facing toothed portions 17 and 18 that are engageable selectively by corresponding teeth on a shifter member 19, that is slideably keyed to shaft 13 for rotation therewith.

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Carrier Transportation System

A typewriter having a moveable type element carrier 10 and escapement system, therefor, like that described in U. S. patent 3,126,998, is provided with a selectively operative bidirectional bias from motor 11 acting through friction clutch
12. Clutch 12 drives shaft 13 in the direction of arrow 14. A pair of spaced sprocket members, 15 and 16 mounted on shaft 13 by suitable bearings, permit relative movement therebetween. The sprocket members 15 and 16 have respective inwardly facing toothed portions 17 and 18 that are engageable selectively by corresponding teeth on a shifter member 19, that is slideably keyed to shaft 13 for rotation therewith.

A direction control lever 20 engages shifter 19 by a ball and slot connection. Lever 20 is normally biased by spring 21 to the position shown, where shifter 19 is engaged with teeth 17 of sprocket 15. The rotation of shaft 13 is thus transmitted to sprocket 15, while sprocket 16 is permitted to freewheel on shaft
13.

A bead chain 22 is connected at its opposite ends to carrier 10 and is tracked around pulleys 23 and 24 to the sprocket 16, around reversing pulley 25 to sprocket 15, and over pulleys 26 and 26 back to the carrier 10. Rotation of sprocket 15 pulls downwardly on bead chain 22 at the left of pulley 26 to urge carrier 10 rightwardly. This motion of carrier 10 normally is opposed by a pawl, not shown, as described in U. S. patent 3,126,998. If motion of carrier 10 is not opposed, th...