Browse Prior Art Database

SINGLE REVOLUTION, ELECTROMAGNETIC FRICTION CLUTCH

IP.com Disclosure Number: IPCOM000025381D
Original Publication Date: 1985-Feb-28
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 84K

Publishing Venue

Xerox Disclosure Journal

Abstract

Referring to the drawing figures, in copying machine paper feeders of the type that employ a pair of segmented feed rolls 4 rather than the traditional full circum-ference feed roll or wheel, it is critical that the feed roll segments 5 return to a given rest or "home" position after each sheet feed cycle. Since a complete feed cycle requires a single revolution of the feed rolls 4, applications of this type have historically used a wrap-spring clutch to couple and uncouple the feed roll drive shaft 7 to the machine drive motor. However, the inherent unreliability of wrap-spring clutches, particularly where used in low speed, low inertia applications such as paper feeders, renders their use undesirable. Further, if it is desired to employ a stalled-sheet registration scheme, it is necessary that the drive shaft 7 be stopped momentarily at some point during the feed cycle.

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XEROX DISCLOSURE JOURNAL

SINGLE REVOLUTION, ELECTROMAGNETIC Proposed Classification FRICTION CLUTCH
Wayne F. Schoppe
Donald P. Miller

U.S. CI. 27 1 /258 Int. Cl. B65h 7/02

I

17 Volume 10 Number 1 January/February 1985

I6

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SINGLE REVOLUTION, ELECTROMAGNETIC FRICTION CLUTCH (Cont'd)

Referring to the drawing figures, in copying machine paper feeders of the type that employ a pair of segmented feed rolls 4 rather than the traditional full circum- ference feed roll or wheel, it is critical that the feed roll segments 5 return to a given rest or "home" position after each sheet feed cycle. Since a complete feed cycle requires a single revolution of the feed rolls 4, applications of this type have historically used a wrap-spring clutch to couple and uncouple the feed roll drive shaft 7 to the machine drive motor. However, the inherent unreliability of wrap- spring clutches, particularly where used in low speed, low inertia applications such as paper feeders, renders their use undesirable. Further, if it is desired to employ a stalled-sheet registration scheme, it is necessary that the drive shaft 7 be stopped momentarily at some point during the feed cycle.

An improved sheet feeder is proposed where an electromagnetic friction clutch 9 is used in combination with an encoder disc 12 in place of the more conventional wrap-spring clutch. Here, the input pulley/armature 10 of clutch 9 turns whenever the mach...