Patent ID: 6722648
Filing Date: 2004-04-20
Classification: B65H,Y10S,Y10T

Abstract:
A drive mechanism for rotating a drive roller, comprising:an input transmission mechanism for transmitting a drive force from a motor; an output transmission mechanism for transmitting the drive force to the drive roller; an intermediate transmission mechanism for selectively transmitting the drive force from the input transmission mechanism to the output transmission mechanism in either a first direction or a second direction; and a switching mechanism for moving the intermediate transmission mechanism to a first position to drive the output transmission mechanism in the first direction or a second position to drive the output transmission mechanism in the second direction, wherein the switching mechanism comprises: a cam member, connectable to the input transmission mechanism, for moving the intermediate transmission mechanism between the first position and the second position, the cam member comprising a first gear portion, a first non-toothed portion, a second gear portion, and a second non-toothed portion formed on an outer surface of the cam member, wherein the first non-toothed portion faces the input transmission mechanism when the intermediate transmission mechanism is in the first position and the second non-toothed portion faces the input transmission mechanism when the intermediate transmission mechanism is in the second position; and a trigger mechanism for selectively engaging the cam member with the input transmission mechanism, the trigger mechanism selectively engaging the first gear portion with the input transmission mechanism to move the cam member so that the first non-toothed portion faces the input transmission mechanism and selectively engaging the second gear potion with the input transmission mechanism to move the cam member so that the second non-toothed portion faces the input transmission mechanism.