Browse Prior Art Database

Fail Safe Clutch Operation

IP.com Disclosure Number: IPCOM000078601D
Original Publication Date: 1973-Feb-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 2 page(s) / 56K

Publishing Venue

IBM

Related People

Fathergill, RD: AUTHOR [+2]

Abstract

Cam 10 is rotated to its broken line position to raise roll 11 into pressure contact with roll 12 under the control of solenoid 13. A normally disengaged spring clutch 14, like that disclosed in U. S. Patent 2,909,935, becomes engaged upon activation of solenoid 13 which drives pressure shoe 15 against the clutch spring 14. Continuously rotating shaft 16 is thereby connected to cam shaft 17, to drive cam 10 clockwise toward its broken line position. Spring 18 is stressed during this clockwise rotation.

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Fail Safe Clutch Operation

Cam 10 is rotated to its broken line position to raise roll 11 into pressure contact with roll 12 under the control of solenoid 13. A normally disengaged spring clutch 14, like that disclosed in U. S. Patent 2,909,935, becomes engaged upon activation of solenoid 13 which drives pressure shoe 15 against the clutch spring 14. Continuously rotating shaft 16 is thereby connected to cam shaft 17, to drive cam 10 clockwise toward its broken line position. Spring 18 is stressed during this clockwise rotation.

Control cam 19 rotates with output shaft 17 to a position where ledge 20 moves beneath follower latch 21. Stop ledge 22 on cam 19 engages flange 23 of clutch control lever 24 to drive the shoe 15 out of engagement with spring 14, thus disengaging the input shaft 16 from output shaft 17. Cam 19 is prevented from restoring to its original position under the influence of spring 18 by interference between ledge 20 and latch 21. The backup roll 11 thus will be maintained in its elevated position so long as power is applied to solenoid 13.

If, for any reason, power is dropped to solenoid 13, either intentionally or through a power failure, spring 25 will drive control arm 24 clockwise moving a cam surface 26 thereon against follower 27 to lift arm 28 and follower latch 21 against spring 29, thereby releasing ledge 20 of cam 19 and allowing the cam 19 to be restored to its original position by spring 18.

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