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Powered Platen Indexing Mechanism

IP.com Disclosure Number: IPCOM000094673D
Original Publication Date: 1965-Apr-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 78K

Publishing Venue

IBM

Related People

Miles, GT: AUTHOR

Abstract

When keybutton 10 is depressed by a typist, platen 11 of a typewriter is rotated through a selected angular distance. This permits a piece of paper to be automatically advanced to the first writing line after insertion of the paper in the typewriter.

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Powered Platen Indexing Mechanism

When keybutton 10 is depressed by a typist, platen 11 of a typewriter is rotated through a selected angular distance. This permits a piece of paper to be automatically advanced to the first writing line after insertion of the paper in the typewriter.

As keybutton 10 moves down, bellcrank 12 pivots clockwise and link 13 is pulled to rotate lever 14 about its pivot pin 15. Wound about stud 16 projection from lever 14 is torsion spring 17. This has one end 18 that engages lug 19 of mounting bracket 20. The other end 21 of spring 16 rests in slot 22 formed in lug 23 of bracket 20. An L-shaped spring 24 is carried at the rear-end of clutch actuating arm 25. This is pivotally mounted by pin 26 and carries clutch shoe 27 on the forward end.

Forward movement of lever 14 causes end 21 of sprig 16 to engage and push the upper end of spring 24 from its latching slot. End 21 of spring 16 then enters slot 28 in spring 24. This action eliminates a repeat operation if keybutton 10 is still depressed when the operational cycle is completed. Arm 25 pivots counterclockwise under the action of sprig 29 and shoe 27 engages the convolutions of spring clutch 30. Power is transmitted from continuously rotating shaft 31 to drum 32 which results in the winding of cord 33. The upper end of cord 33 is wrapped about pulley 34. This is biased for counterclocks wise rotation by a clockspring, not shown. Index ratchet 35 is mounted on the end of and is movable...