Bound book and method of making such books

A method of making a succession of bound books which are ready to be covered or cased, said method comprising the steps of:

• (a) in a first step forming a succession of packs consisting of a plurality of signatures and front and back end sheets while moving all said packs endwise in constantly spaced relationship to one another at a constant speed sufficient to produce at least about 100 books a minute, at least some of said signatures comprising a plurality of interleaved sheets, and each signature having a closed side;
• (b) in a second step clamping said packs seriatim with said closed sides of the signatures lowermost and copolanar with one another and with the lower margins of the end sheets to provide each pack with a spine, the lower marginal portions of the packs being free of clamping pressure;
• (c) in a third step forming a multiplicity of closely spaced, wide open notches seriatim in the spines of said moving packs, said notches penetrating the entire spine and all the closed sides of sheets in each signature to greatly enlarge the area of each spine to which adhesive may be applied;
• (d) in a fourth step nipping said lower marginal portions of the moving packs seriatim;
• and
• (e) thereafter in separate steps applying thin strips of adhesive simultaneously to each of the front and back surfaces of the moving packs seriatim adjacent and between the notches in such a way that some of said adhesive extends into said notches and some of said adhesive forms a thick bead along the margin of the strip remote from the notches, and applying an excess of adhesive seriatim to the spines of said moving packs in such a way that said adhesive coats the entire spine and the faces of the notches and amalgamates with the adhesive of said thin strips in the notches.

A method of making a succession of bound books which are ready to be covered or cased, said method comprising the steps of:

• (a) in a first step forming a succession of packs of signatures while moving all said packs endwise in constantly spaced relationship to one another at a constant speed sufficient to produce at least about 100 books a minute, at least some of said signatures comprising a plurality of interleaved sheets, each signature having a closed side;
• (b) in a second step clamping said packs seriatim with said closed sides lowermost and coplanar to provide each pack with a spine and with the lower marginal portions of said packs free of clamping pressure;
• (c) in a third step forming a multiplicity of closely spaced, wide open notches seriatim in the spines of said moving packs, said notches penetrating the entire spine and all the closed sides of sheets in each signature to greatly enlarged the area of each spine to which adhesive may be applied;
• (d) in a fourth step nipping said lower marginal portions of the moving packs seriatim;
• and
• (e) thereafter in separate steps applying thin strips of adhesive simultaneously to each of the front and back surfaces of the moving packs seriatim adjacent and between the notches in such a way that some of said adhesive extends into said notches and some of said adhesive forms a thick bead along the margin of the strip remote from the notches, and applying an excess of adhesive seriatim to the spines of said moving packs in such a way that said adhesive coats the entire spine and the faces of the notches and amalgamates with the adhesive of said thin strips in the notches.