along one longitudinal margin of the container board in the manner shown in fig1 and 2 the rolls 74 and 76 are driven concurrently with the roll 52 so as to insure proper coordinated feeding of the subassembly 27 into the nip 80 at the same rate of travel as the board 16 through the nip 80 the feed roll 52 is actuated through a clutch mechanism which is coupled to the actuator 70 of the severing station so as to interrupt feeding of the assembly through the severing station at the time when the severing station is actuated to cut off the subassembly strip the feed roll 52 is coordinated with the severing station 66 to cut off the subassembly 64 at a preselected point along its length which insures that the severing of the cutter bar is on a proper line relative to the series of eyelets 32 and the serrations of the cutting edge 38 preferably the controls for the feed and severing station are such that the severing station is actuated after the position of the cutter strip in the severing station has been adjusted to a preselected point prior to actuation of the severing device to give a precision cutoff of the cutter strip as desired the advance of the feed roll 52 is arrested by disengagement of a clutch from the common drive so that the synchronism between the drive of the feed roll 52 with the drive.