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Simple Self-Locking Non-Rotating Pulley Shaft Assembly

IP.com Disclosure Number: IPCOM000047698D
Original Publication Date: 1983-Dec-01
Included in the Prior Art Database: 2005-Feb-08
Document File: 2 page(s) / 53K

Publishing Venue

IBM

Related People

Komplin, SR: AUTHOR

Abstract

When mounting carrier drive belt pulleys in a typewriter, it is desirable to provide a non-rotating axle for the pulleys as well as a device by which the pulleys may be easily removed and replaced to aid in the servicing and replacing of the drive belt. Bracket 10 is mountable on the frame of the typewriter and will act to support the escapement motor 12 as well as the remainder of the drive assembly. Escapement motor 12, through gear 14, drives gear 16 and pulley 18 to provide the motion necessary to belt 20. Belt 20 is normally tensioned in a leftward direction, as indicated by arrow 22. In order to provide a non-rotating axle support for pulley 18 and gear 16, shaft 24 is provided with flats 26 formed into the ends thereof.

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Simple Self-Locking Non-Rotating Pulley Shaft Assembly

When mounting carrier drive belt pulleys in a typewriter, it is desirable to provide a non-rotating axle for the pulleys as well as a device by which the pulleys may be easily removed and replaced to aid in the servicing and replacing of the drive belt. Bracket 10 is mountable on the frame of the typewriter and will act to support the escapement motor 12 as well as the remainder of the drive assembly. Escapement motor 12, through gear 14, drives gear 16 and pulley 18 to provide the motion necessary to belt 20. Belt 20 is normally tensioned in a leftward direction, as indicated by arrow 22. In order to provide a non-rotating axle support for pulley 18 and gear 16, shaft 24 is provided with flats 26 formed into the ends thereof. Assembly is accomplished by the insertion of shaft 24 through "D" slot 28 through pulley 18 and gear 16 and then into D-shaped hole
30. When belt 20 is tensioned in direction 22, the force against pulley 18 will act to seat the flats 26 on axle 24 against the flat portions of slot 28 and hole 30, thus accurately positioning the axis of rotation of pulley 18. To remove the belt and/or pulley 18, it is only necessary to reduce the tension on belt 20 and remove the pin 26. The tension on belt 20 acts to prevent pin 24 from moving axially and falling out of the slot 28 and hole 30.

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