Abstract: An apparatus for applying hot melt glue to back surfaces of book blocks, wherein these back surfaces are distributed in fan-like fashion, by means of glueing rollers, two of which are consecutively arranged conically-shaped rollers which are adjustable in their angular setting, whereby the tearing out resistance of the sheet edges is increased. Each glueing roller is supported in an individual glue pan which may be separately pivoted and adjusted in its height. By adjusting of angular setting of the aforementioned two rollers the vertical position of each glue pan may be corrected. This will ensure a uniform and sufficiently large glue layer over the back surfaces of the blocks throughout the entire process of glueing.