Patent ID: 7819395

Claim:
A sheet handling machine comprising: A. a drive source; B. a first driven shaft arranged to receive drive from said drive source at least when said drive source drives in a first direction of rotation; C. a feed roller shaft; D. a feed roller mounted on said feed roller shaft for feeding sheets when said feed roller shaft is driven; E. rotatably supported drive transmission means for selectively engaging drive transmission from said first driven shaft to said feed roller shaft in dependence upon the rotational position of said drive transmission means: wherein said drive transmission means is: a support arm rotatably supported at a pivot so as to be selectively pivotable between a first angular position in which the transmission means is disengaged from transmitting drive from said first driven shaft to said feed roller shaft and a second angular position in which the transmission means is engaged to transmit drive from said first driven shaft to said feed roller shaft; a drive receiving member mounted on said feed roller shaft for receiving drive so as to drive said feed roller shaft, wherein: said drive receiving member is a friction roller; said drive transferring member is a friction roller rotationally mounted on said support arm; when the support arm is in the first position, said drive transferring member is frictionally decoupled from said drive receiving member; when the support arm is in the second position, said drive transferring member is frictionally coupled to said drive receiving member, so that rotation of the drive transferring member causes rotation of said drive receiving member, thereby to transfer drive from said drive transferring member to said feed roller shaft; and wherein said drive transmission means further comprises: a drive transferring member mounted on said support arm spaced apart from the pivot of said support arm, the drive transferring member being disengaged from said drive receiving member when the support arm is in the first position, and being configured to engage said drive receiving member when the support arm is in the second angular position, thereby to transfer drive from said drive transferring member to said drive receiving member so as to drive said feed roller shaft.