Balking clamp positive drive

A positive drive comprising:

• (a) an input member adapted to be rotated by driving torque transmitted from a power source to rotate a pair of spaced output members;
• (b) first clutch means having an engaged mode which locks in a predetermined rotational relationship said input member to one of said output members when said one output member is rotating at an angular velocity in the direction of torque transmittal that is equal to or less than a predetermined angular velocity of said other output member and having a disengaged mode which allows said one output member to rotate relative to said input member when said one output member is rotating at an angular velocity in the direction of torque transmittal that is greater than a predetermined angular velocity of said other output member;
• (c) second clutch means spaced from said first clutch means and having an engaged mode which locks in a predetermined rotational relationship said input member to said other output member when said other output member is rotating at an angular velocity in the direction of torque transmittal that is equal to or less than a predetermined angular velocity of said one output member and having a disengaged mode which allows said other output member to rotate relative to said input member when said other output member is rotating at an angular velocity in the direction of torque transmittal that is greater than a predetermined angular velocity of said one output member;
• (d) first cam means having forward and rearward cam surfaces and forward and rearward contact surfaces, said first cam means being movable to move said first clutch means from said disengaged mode to said engaged mode;
• (e) second cam means having forward and rearward cam surfaces and forward and rearward contact surfaces, said second cam means being movable to move said second clutch means from said disengaged mode to said engaged mode, said first and second cam means being disposed adjacent one another with said forward and rearward cam means facing respectively said forward and rearward cam surfaces of the other cam means and, said forward and rearward contact surfaces of one cam means aligned respectively with said forward and rearward contact surfaces of the other cam means;
• (f) a balking clamp interposed between said first and second cam means and having a pair of arms, one of said arms having a forward contact surface and the other of said arms having a rearward contact surface, said forward and rearward surfaces of said balking clamp being located respectively adjacent said forward and rearward contact surfaces of said cam means to contact said cam means contact surfaces upon movement of one of said cams means relative to the other of said cam means to limit the movement of said cams means relative to one another;
• and
• (g) means to exert a force on at least one of said cams means to move said cam means and thereby move the respective clutch to said engaged mode.