Single revolution drive system including a rotary timing cam

In a machine including means for sensing a sheet fed to the machine, a drive system comprising:

• a. a rotary timing cam having a home position;
• b. an actuating member mounted for movement into and out of a locking relationship with the cam;
• c. a control member mounted for movement into and out of a home position thereof;
• d. a latching member mounted for latching and unlatching the control member in its home position;
• e. a first spring connected to the control member for urging the control member out of its home position;
• f. a second spring connected to the actuating member and control member for urging the actuating member into the locking relationship with the cam;
• g. the latching member normally latching the control member in its home position against the force exerted by the first spring, and the control member normally latching the actuating member in the locking relationship with the cam against the force exerted by the second spring;
• h. means for operating the drive system, the operating means including means for causing the latching member to unlatch the control member in response to the sensing means sensing a sheet fed to the machine, and the operating means including a motor for controlling rotation of the cam in response to movement of the actuating member;
• and
• i. the operating means including a motor switch, the control member causing the actuating member to actuate the motor switch for energizing the motor when the control member is unlatched, and the motor rotating the cam out of its home position when the switch is actuated.