| 摘要 |
A sheet feeder for the single feed of sheets from a stack, comprising a first member which moves with a reciprocating motion across the top sheet of the stack, performing a forward stroke from a position of departure to a position of arrival in the direction of feed of the sheets and a return stroke to the position of departure, and a second member which depends pivotably from the first member so as to lean on the top sheet in a direction such that, during the return stroke the second member trails across the top sheet, whereas, in the forward stroke the second member wedges against the top sheet and, during a first part of the forward stroke, sticks to the top sheet and detaches it from the subadjacent sheet of the stack and in the remaining part of the forward stroke advances the top sheet in the direction of feed. The stack is supported in a sheet container having a support plate movable upwardly by a spring biased system of scissors levers. An adjustable lateral edge stop is connected with the spring which biases the scissors levers to vary the tension of the spring with variation of the format of the stack of sheets in the container.
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