A high speed machine which successively removes unbound book pad strips from the bottom of a stack and feeds them toward a glueing machine. The feeder is adapted for different strip sizes including larger sizes and comprises stack guide device disposed above synchronized, rotating, slotted discs which support the forward edge of the stack bottom. The strips in the stack are provided with cardboard separators therebetween and a knife enters the stack bottom and lifts all except the lowermost strip to permit the leading edge of the first slotted disc to enter. The rotating discs progressively push the leading edge of the lowermost strip downwardly past a group of rollers. These rollers, which are movably mounted, are then depressed to press the lowermost strip against an endless belt. The belt carries the stack to a rotating carriage which will deposit the stack in the glueing machine.