Patent ID: 7806640

Claim:
A bookbinding apparatus for forming a booklet by coating an adhesive on a spine of a stack of sheets, comprising: a coating apparatus, having: an adhesive reservoir for storing a liquid of the adhesive; and a coating roller for coating on the spine of the stack of sheets the adhesive scooped up from the adhesive reservoir; a pellet storage section for storing pellets of the adhesive; a replenishing section for replenishing the pellets of the adhesive from the pellet storage section into the adhesive reservoir; an adhesive quantity sensor for detecting a liquid level in the adhesive reservoir; and a controller for controlling the replenishing section based on a detection signal of the adhesive quantity sensor, wherein the controller calculates a rate of replenishing the pellets based on information of the stack of sheets, the information comprising a number of sheets included in the stack of sheets, and wherein the controller controls the rate of replenishing the pellets by controlling the replenishing section based on the calculated rate of replenishing the pellets.