Method of and means for positioning sliders on zippers for reclosable bags

A device for controlling the position of sliders on a resiliently flexible bag closing zipper on bag making material travelling along a manufacturing path wherein the sliders are selectively applied to the zipper at bag width sections of the material upstream from a sealing station wherein sides of the bag width sections are sealed, comprising:

• a frame providing a passsage for the zippers as carried on the bag making material and to which the sliders have been applied to said zipper at the bag width sections of the material upstream from the device;
• roller means and means for operating the roller means for selective engagement of the sliders by said roller means;
• said roller means and said operating means being carried by said frame and said operating means being operable for moving said roller means away from one another for permitting a slider mounted on the zipper of the bag making material to pass therebetween;
• and
• said operating means effecting movement of the roller means selectively toward one another into position adjacent to one another for engaging the slider for adjusting the slider position along the zipper in the travel of the bag making material along said path whereby to position the zipper to avoid interference with sealing of sides of said bag width sections in said sealing station.