Patent ID: 7680437

Claim:
Apparatus for driving a machine in a replaceable cartridge, the cartridge supporting a first rotatable element for transferring rotary motion to the machine, wherein the apparatus includes: a housing for accommodating the cartridge at a pre-determined position; a second rotatable element, supported in the housing; and a locking mechanism, including a component, provided on a certain one of the first and second rotatable elements, and capable of assuming a state of readiness in which, with the cartridge at the pre-determined position, the component is positioned relative to the other of the rotatable elements such that, upon rotation of the second rotatable element in at least a first direction, the first rotatable element rotates with the second rotatable element, and in which state the first and second rotatable elements are axially decoupled, wherein the certain one of the first and second rotatable elements is provided with a resilient means for exerting a torque on the component tending to establish the state of readiness without rotating any of the first rotatable element and the second rotatable element.