Method for assembling slide fastener stringers

An assembling apparatus for slide fastener stringers comprising a pair of laterally disposed feed rollers for feeding a pair of laterally disposed slide fastener stringers successively each having spaced sections where there are no scoops in continuous rows of scoops;

• a binder member fixedly positioned on the feeding side of said feed rollers for engaging said stringers;
• a pair of laterally disposed claws for protruding into the spaced sections of the stringers and engaging with the leading edges of scoop rows directly following said spaced sections;
• a differential transmission mechanism for retarding the rotational velocity of the one of said two feed rollers which feeds the leading stringer with which one of said two claws is engaged while accelerating the rotational velocity of the other roller until the leading edges of said two stringers are aligned with each other;
• said claws being adapted to come out from the spaced sections of the stringers when the leading edges of the scoop rows of the stringers are aligned;
• characterized in that a pair of laterally disposed detecting levers are provided to protrude into the succeeding spaced sections of said stringers as they arrive and then to come out therefrom;
• and a detector is provided to detect the movement of the detecting lever so as to judge whether the engagement of the pair of stringers is proper and to produce either a signal to protrude the claw into the spaced section directly succeeding the detecting lever if the stringer alignment is proper or a signal to stop operating the feed roller if said alignment is not proper.