Patent ID: 7594657

Claim:
An apparatus comprising: a rotational drum having a circumferential surface configured to support a medium; and a guide movable between a first position in which the guide is configured to press the medium towards the circumferential surface and at least one second position further retracted from the circumferential surface than the first position, wherein the guide is supported independent of the drum such that the drum is rotatable relative to the guide while the guide is in the first position to move the medium relative to the guide while the guide is in the first position; a guide actuation mechanism configured to move the guide between the first position and the second position based upon an angular positioning of the circumferential surface, wherein the guide actuation mechanism comprises: a cam surface coupled to the drum to rotate with the drum; and a cam follower coupled to the guide and in engagement with the cam surface, wherein the cam follower is configured to engage the cam during rotation of the drum to move the guide relative to the circumferential surface; and an actuator configured to move the cam follower between a cam engaged state and a cam disengaged state, wherein the actuator is configured to move the cam follower to and hold the cam follower at a first retracted position spaced from the cam a first distance and to move the cam follower to and hold the cam follower at a second retracted position spaced from the cam a second distance less than the first distance.