DRIVING TRANSMISSION RELEASE MECHANISM

PURPOSE:To prevent the damage of a transmission for a copier or the like, by disengaging a linear member from a rotary member under overload but keeping the linear member engaged with the rotary member to perform transmission under normal load. CONSTITUTION:The displacement of a rotary member 1 in a direction (e) is convenient to cause load fluctuation with low resisting force f2 and a large displacement distance of the rotary member 11. When overload acts to a part (including a driving section such as a cleaner) of a drive system such as a transmission, the rotary member 11 is automatically displaced in the direction of the arrow (e) to disengage a linear member 9 from a driving sprocket 8 so that the rotary member races. Therefore, driving power is not transmitted to the rotary member 11, so that the drive system is protected from damage. In that case, the critical torque can be adjusted by the resisting force f1 of a resisting member 14.