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Abstract

Apparatus for binding perfect bound books of different thickness is disclosed where the amount of adhesive applied to the spine of the book block may be varied in relation to the thickness of the book block. An adhesive application station is provided which has a rotary driven adhesive application wheel partially immersed in a bath of a liquefied adhesive such that as a portion of the wheel rotates up out of the adhesive, the periphery of the wheel is coated with a layer of adhesive. An area of increased thickness of the adhesive if formed adjacent the top of the wheel so that upon effecting relative movement of the book block and the adhesive application station, adhesive is applied to the spine of the book block. The thickness of the layer of adhesive applied to the spine of the book block may be varied in relation to the thickness of the book block generally in accordance with the formula AT=b+mX, where AT is the adhesive thickness, b is the width of an initial gap between the topmost surface of the wheel and the spine, and where mX is a function of the number of sheets making up the book block, or is a function of the measured thickness of the book block.

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First Claim