Rotary driving mechanism

A rotary drive mechanism for selectively and rotationally driving at least first and second bodies which are to be driven, said rotary drive mechanism comprising:

• a single motor rotatable in forward and reverse directions;
• an arm structure pivotally supported on an output shaft rotated by said motor, said arm structure having first, second and third rotary positions;
• a first rotation transmitting body fixed to said output shaft;
• a second rotation transmitting body rotatably supported on said arm structure, said second rotation transmitting body comprising a first transmitting part which is constantly linked to said first rotation transmitting body and a second transmitting part;
• and
• a third rotation transmitting body having a predetermined rotary load, said third rotation transmitting body being linked to said second transmitting part when said arm structure is in said first rotary position whereby the predetermined load is sufficient to allow the second transmitting part to roll thereon when driven by the first rotation transmitting body,
• said second transmitting part disengaging from said loaded third rotation transmitting body when said motor rotates in the forward direction, and said first transmitting part engaging and rotationally driving said first body when said arm structure rotates from said first rotary position to said second rotary position,
• said second transmitting part disengaging from said loaded third rotation transmitting body when said motor rotates in the reverse direction, and said first transmitting part engaging and rotationally driving said second body when said arm structure rotates from said first rotary position to said third rotary position.