PURPOSE: To securely send out stitched sheets of paper one volume each at a time by blowing air into between the topmost volume of stitched sheets of paper and volumes of stitched sheets of paper on its lower part to float up the topmost volume of stitched sheets of paper and sending out the topmost volume of stitched sheets of paper in this condition.

CONSTITUTION: Air 7 is blown out of the nozzle of an air blow-out device 6 into between the topmost volume of stitched sheets of paper 3 and volumes of stitched sheets of paper 3 on its lower part to float up the topmost volume of stitched sheets of paper 3. Thereby, the friction resistance between the topmost volume of stitched sheets of paper 3 and the volume of stitched sheets of paper 3 on its lower part is greatly reduced making the topmost volume of stitched sheets of paper 3 easy to move. As the topmost volume of stitched sheets of paper 3 is floated up, its top face on the base end side is brought into pressure contact with the contact piece 10a of a delivering device 10. Then, by driving a driving part 10b, the topmost volume of stitched sheets of paper 3 is sent out forward at a defines stroke. Thereupon, the end of the volume of stitched sheets of paper 3 is held between rubber rollers 12 from up and down to send the volume of stitched sheets of paper 3 further forward. Thereby, only the topmost volume of stitched sheets of paper 3 can be securely sent out without impairing the binding of the stitched sheets of paper, with a slight force.