Browse Prior Art Database

Floating Reverse Motion Inhibitor

IP.com Disclosure Number: IPCOM000048222D
Original Publication Date: 1981-Dec-01
Included in the Prior Art Database: 2005-Feb-08
Document File: 2 page(s) / 35K

Publishing Venue

IBM

Related People

Shadwick, DT: AUTHOR

Abstract

Reverse motion is prevented by this floating, one-way brake employed by the take-up spool of a typewriter ribbon. A pawl with teeth bendable with movement in the ribbon-feed direction moves axially while being held against rotation by an arm captured in a slot. The entire assembly can be mounted within a generally conventional cartridge having both supply and take-up spools.

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Floating Reverse Motion Inhibitor

Reverse motion is prevented by this floating, one-way brake employed by the take-up spool of a typewriter ribbon. A pawl with teeth bendable with movement in the ribbon-feed direction moves axially while being held against rotation by an arm captured in a slot. The entire assembly can be mounted within a generally conventional cartridge having both supply and take-up spools.

Take-up spool 1 has a central hub 2 and a top, smaller end member 3 with peripheral teeth 5. Pawl 7 fits around member 3 with teeth 9 which engage teeth 5 and with an arm 11 having a spherical end 12 engaged by the slot 13 of stationary guide 15. Teeth 9 point in the counterclock-wise direction and are sufficiently resilient so that counterclock-wise movement of spool 1 to wind up the ribbon pushes teeth 9 aside. Attempted opposite movement of spool 1 is prevented by the ends of teeth 9 nonyieldably engaging teeth 5.

During take-up of the ribbon, the entire spool 1 is free to move axially with pawl 7, remaining engaged and operative. Pawl 7 is free to move axially with end 12 of arm 11 moving within the slot 13.

Pawl 7 remains held against rotation by the arm 11 still being captured in slot 13. End member 3 is thicker than pawl 7 to permit pawl 7 to move upward in response to the ribbon coming upward to thereby engage arm 11 and force it upward.

The number and spacing of the teeth of the pawl or the end member is selected in relation to the reduction in the a...