Pressure roller mechanism for stacking apparatus

摘要

In an envelope stacker, a normal force roller mechanism drives a mail piece vertically then retracts without adding significant torque to the stacker. The normal force roller mechanism is comprised of a frame and a bracket pivotally mounted to the frame, the bracket further having an aperture and an arm with a shaft extending therefrom. An idler roller is mounted to the shaft. A hub having a slot is rotatably mounted to a plate. An assembly is provided for moving the plate in a substantially horizontal direction. A generally L-shaped pin having a first end portion and a second end portion extends through the slot so that the first end portion engages the aperture of the bracket. A spring is mounted onto the L-shaped pin between the second end portion and the hub.