Browse Prior Art Database

Variable Force Sheet Feeding Mechanism

IP.com Disclosure Number: IPCOM000083662D
Original Publication Date: 1975-Jul-01
Included in the Prior Art Database: 2005-Mar-01
Document File: 2 page(s) / 28K

Publishing Venue

IBM

Related People

Froula, JD: AUTHOR [+2]

Abstract

This buckling type paper sheet feeding mechanism separates the top sheet of a stack from the underlying sheet, by first driving the front sheet edge in a rearward direction against a rear restraint, causing the top sheet to buckle, and then reversing the direction of sheet drive, causing the top sheet to be fed forward over a front stack edge restraining means. The top sheet is moved rearward by a variable force which provides a progressively increasing buckling force, to thereby ensure reliable feed of paper of varying types, weights and humidity content, while at the same time minimizing the possibility of double-sheet feed.

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Variable Force Sheet Feeding Mechanism

This buckling type paper sheet feeding mechanism separates the top sheet of a stack from the underlying sheet, by first driving the front sheet edge in a rearward direction against a rear restraint, causing the top sheet to buckle, and then reversing the direction of sheet drive, causing the top sheet to be fed forward over a front stack edge restraining means. The top sheet is moved rearward by a variable force which provides a progressively increasing buckling force, to thereby ensure reliable feed of paper of varying types, weights and humidity content, while at the same time minimizing the possibility of double- sheet feed.

The variable force is provided by pneumatic actuator 10. Solenoid 11 is energized, by switch 12, when it is desired to feed the top sheet from stack 13. Energization of the solenoid 11 drives piston 14 to the right, compressing the fluid, for example air, within closed chamber 15. This pressurized air then flows to balloon-like diaphragm 16, causing friction pad 17 carried thereby to move into engagement with the top sheet of the stack 13. The expansion of diaphragm 16 is controlled by stationary metal plate 18, this plate being mounted at 19.

The force exerted on the top sheet by the expanding diaphragm 16 causes the top sheet to separate and pull out from under forward restraint 20, as the rear edge engages rear restraint 21. As a result, buckle 22 is formed in the top sheet. A switch, not shown, is...