Range of motion limiting device for shuttle carriage

A range of motion limiting device comprising:

• a first armature having a first longitudinal end, a second longitudinal end;
• a first transverse side, a second transverse side;
• the first longitudinal end of the first armature configured to engage a carriage moving on at least one rail having a first surface and a second surface transversely offset from the first surface of the at least one rail;
• a first bumper adjacent the first longitudinal end of the first armature, extending transversely from the first transverse side of the first armature;
• the first bumper having a distal end engaging the first surface of the at least one rail;
• a second bumper longitudinally offset from the first bumper on the first armature, the second bumper extending transversely from the second transverse side of the first armature;
• the second bumper having a distal end engaging the second surface of the at least one rail;
• and
• the range of motion limiting device configured a contact force from the carriage rotationally biases the first bumper against the first surface of the at least one rail and the second bumper against the second surface of the at least one rail in a camming action, thus prohibiting further longitudinal movement of the carriage toward the first armature.