Browse Prior Art Database

Reciprocating Carriage

IP.com Disclosure Number: IPCOM000091817D
Original Publication Date: 1968-May-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 37K

Publishing Venue

IBM

Related People

Freeman, FR: AUTHOR

Abstract

A unidirectional rotary input is converted to a long stroke reciprocating output having relatively constant velocity between end points. There is controlled harmonic acceleration and deceleration at each end. The device is more compact than conventional rotary-to-linear motion converters such as a scotch yoke. Motor 1, drawing 4, supplies a continuous rotary motion to drive pulley 2 which, in turn, drives endless belt 3. The latter is tensioned and supported by idler pulley 4. A chain and sprocket or toothed belt assembly can be substituted for the belt and pulley system. Carriage 5 is slidably mounted on guide bar 6 in a position above belt 3. Spring-loaded caster 7 supports the other end of 5. Drive pin 8 is rigidly fixed to belt 3 and projects through slot 9 in carriage 5.

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Reciprocating Carriage

A unidirectional rotary input is converted to a long stroke reciprocating output having relatively constant velocity between end points. There is controlled harmonic acceleration and deceleration at each end. The device is more compact than conventional rotary-to-linear motion converters such as a scotch yoke. Motor 1, drawing 4, supplies a continuous rotary motion to drive pulley 2 which, in turn, drives endless belt 3. The latter is tensioned and supported by idler pulley 4. A chain and sprocket or toothed belt assembly can be substituted for the belt and pulley system. Carriage 5 is slidably mounted on guide bar 6 in a position above belt 3. Spring-loaded caster 7 supports the other end of 5. Drive pin 8 is rigidly fixed to belt 3 and projects through slot 9 in carriage 5. As belt 3 rotates, pin 8 imparts a relatively constant velocity reciprocating motion to the carriage as 8 travels between 2 and 4. As 8 travels around 2 and 4, the motion of 5 is smoothly decelerated to a halt and accelerated to full velocity. Acceleration and deceleration at the ends of travel can be varied by changing the pulley diameters. Drawing B shows another arrangement in which two guide bars and two counter-rotating belts are utilized. This configuration provides a balanced loading on the carriage.

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