Variable force sheet feeding mechanism

Details Variable force sheet feeding mechanism Variable force sheet feeding mechanism

B - Operations, Transporting

65

H

270/115

B65H 3/02 (2006.01)

Patent

CA 1042932

VARIABLE FORCE SHEET FEEDING MECHANISM Abstract of the Disclosure A buckling type paper sheet feeding mechanism wherein the top sheet of a stack is separated 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 in a forward direction over a front stack edge restraining or hold-down means. The top sheet is moved rearward by a variable force means 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 possibi- lity of double sheet feed. A variable position rear restraint moves rearward, in synchronism with operation of the variable force means, to increase the column length of the top sheet as the buckling force increases.

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