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Compensating Armature Pressure Roll Device

IP.com Disclosure Number: IPCOM000084665D
Original Publication Date: 1975-Dec-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 2 page(s) / 34K

Publishing Venue

IBM

Related People

Beuch, WE: AUTHOR [+2]

Abstract

This device grips a document card 10 between a drive roll 12 and an idler roll 14 carried by a swingable arm 16, the gripping force being due to a leaf spring 18 acting on arm 16 so that the thickness of document 10 may be varied without affecting reliable operation of the device.

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Compensating Armature Pressure Roll Device

This device grips a document card 10 between a drive roll 12 and an idler roll 14 carried by a swingable arm 16, the gripping force being due to a leaf spring 18 acting on arm 16 so that the thickness of document 10 may be varied without affecting reliable operation of the device.

Arm 16 is swingably mounted at point 20, and an armature 22 is also swingably mounted at point 20. Spring 18 has a tapering central portion 18a and an outer reticulated portion 18b and is embedded in armature 22 which is preferably of plastic. A U-shaped magnet core 24 has a coil 26 on one of its legs, and armature 22 has a metal keeper bar 28 embedded in it which is drawn to the ends of core 24 when coil 26 is energized, so as to swing armature 22 from its Fig. 2 position into its Fig. 3 position.

The central portion 18a of spring 18 bears on a boss 16a provided on arm 16, so as to swing arm 16 upwardly and bring idler roll 14 into pressure engagement with document 10 as supported by drive roll 12. Card 10 is then propelled forwardly by roll 12. The outer spring portion 18b bears on fixed stop 30, and spring 18 thus swings armature 22 back into its Fig. 2 position when coil 26 is de- energized.

Arm 16 has a boss 16b on its upper surface, and armature 22 contacts boss 16b so as to bring bearing 14 and arm 16 back into their Fig. 2 positions when coil 26 is de-energized. The motion of armature 22 under these conditions is limited by armature sto...