The surgical tool may include an end effector, an input drive shaft, a closure drive and / or a firing drive. The end effector may comprise a gripper assembly that includes a first gripping member and a second gripping member. The end effector may comprise an I-beam member that translates axially between a proximal position and a distal position within the end effector. In one embodiment, the input drive shaft may selectively mate with a firing drive and / or a closure drive. In one configuration, the closure drive is threaded with the firing drive so that the input drive shaft can move the closure drive and the firing drive simultaneously during the firing stroke until the closure drive is disengaged from the firing drive. To. During the opposite stroke, the closure drive can be re-engaged with the firing drive.
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