Control device for an intermittently movable driver member

A control device for an intermittently movable driver member, wherein a follower member is disposed adjacent the driver member and is adapted to follow a driving surface of said driver member for displacement, retention and return displacement, said control device comprising:

• a control member for controlling the starting and stopping of movement of said driver member, said control member having two control pawls engageable with said driver member;
• clutch means for engaging said driver member with a driving source;
• and
• means for supplying first and second signals to said control member for starting the movement of said driver member by operating said clutch means to engage said driver member with said driving source, wherein movement of said driver member is started by said first signal to displace said follower member to its said retaining position, whereas movement of said driver member is automatically stopped by said clutch means which is actuated by said control member, and wherein movement of said driver member is restarted by said second signal to provide said return displacement of said follower member, at the completion of which said driver member is automatically stopped by said clutch means which is operated by said control member.