Smyth-Cleat sewing
See
illustration A method of machine sewing
or lacing adapted from an earlier European method
by the Smyth Manufacturing Co. in the late 1960s
and early 1970s. It combines thread and adhesive
to secure the leaves of a book. In a separate
machine, the back of the sections are planed off
leaving the spine as smooth as possible. This is a
very critical part of the operation, because if
the cut spine is not smooth and even, subsequent
operations are affected detrimentally. The block
of leaves is then placed spine down in the
Smyth-Cleat machine and is moved into position
where a circular saw cuts a number of cleats
completely across the back from head to tail (the
number depending on the long dimension of the
book). The sawn leaves then move into the sewing
position where a single hollow needle laces thread
around the cleats in the manner of a fiddle or
figure-eight stitch. The sewn text block is then
ready rate of setting; however, if the book is to
be rounded and backed, an adhesive other than a
hot-melt is required. because of the DRYING MEMORY of
hot-melt adhesives.