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Incremental Drive System

IP.com Disclosure Number: IPCOM000090775D
Original Publication Date: 1969-Jul-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 44K

Publishing Venue

IBM

Related People

Lowrance, JL: AUTHOR [+2]

Abstract

A system for incrementally advancing a web by a selected amount is provided. Web 10 is engaged by feed rolls 11 which are driven from motor 12 acting through clutch 13 and one-way driving connection 14. Clutch 13 receives rotating motion from motor 12 through input shaft 15 which drives a ratchet having a single tooth 16 on it. Output gear 17 is rotatably supported on a grounded stud, is concentric with shaft 15 and carries drive pawl 18 on it. Pawl 18 is normally urged radially inwardly to a position in which its tooth 19 is located in the path of tooth 16 by spring 21 connected to gear 17. Control cam plate 22 is rotatably mounted concentric with shaft 15 and is permitted limited rotative movement relative to gear 17. Plate 22 controls the position of pawl 18 by engaging pin 23 on it with camming surface 24.

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Incremental Drive System

A system for incrementally advancing a web by a selected amount is provided. Web 10 is engaged by feed rolls 11 which are driven from motor 12 acting through clutch 13 and one-way driving connection 14. Clutch 13 receives rotating motion from motor 12 through input shaft 15 which drives a ratchet having a single tooth 16 on it. Output gear 17 is rotatably supported on a grounded stud, is concentric with shaft 15 and carries drive pawl 18 on it. Pawl 18 is normally urged radially inwardly to a position in which its tooth 19 is located in the path of tooth 16 by spring 21 connected to gear 17. Control cam plate 22 is rotatably mounted concentric with shaft 15 and is permitted limited rotative movement relative to gear 17. Plate 22 controls the position of pawl 18 by engaging pin 23 on it with camming surface 24.

Spring-biased detent lever 25 is pivoted to gear member 17 and normally engages notch 26 in plate 22 through pin 27. Rotation of lever 25 to its broken line position in response to an external control function permits pawl 18 to move inwardly. Thus, at a proper time following rotation of lever 25 and determined by the angular position of tooth 16, gear 17 is driven through pawl 18 in a counterclockwise direction.

Plate 22 includes knock-off ledge 28 which faces in the direction of counterclockwise rotation. Alternately selectable motion limit stops 29 and 30 are positioned in the path of ledge 28. To vary the stroke of the clutch, s...