the underside of the hem fold from a spool on the underside of the main conveyor assembly 35 by means of the sewing head 14 following this the binding tape is severed from each pocket piece in turn by means of the knife assembly 16 where it is then off loaded from the main conveyor belts 42 and 44 by the unloader assembly 18 where it falls on the flipper assembly 20 the presence of a pocket is sensed causing the flipper assembly 20 to be activated the flipper assembly transfers the pocket piece to a stacker assembly 22 which includes a pair of trap doors 80 and 82 which open when a predetermined number of pockets are present where they drop in a stack to the pusher assembly 24 when one or more stacks are present in the pusher assembly 24 they are transferred in a bundle to the return conveyor assembly 26 including a relatively wide conveyor belt 84 which moves the bundle of hemmed pockets to an end stop 86 the conveyor belt 84 is comprised of a material having a relatively low coefficient of friction so as to slide under a bundle of pockets when it reaches the end stop 86 in the process the sewing head 14 and the upper and lower conveyor assemblies 35 and 55 are commonly driven from a single prime mover.