Bookbinding and its auxiliary branches . Roller BackiriK Machine. 106 BOOKBINDING the roller forward and back two or three times. Releasethe clamp by stepping on the treadle, and remove thebook. ROUNDING AND BACKING MACHINE (CROWLEY).The production of letterpress books by machine hadits beginning with the invention of the rounding andbacking machine. The laborious hand or roller backing. was thus eliminated. After the backs of the books havebeen glued up as described under Rounding, the booksare fed into the machine between a pair of rollers, theback resting against the guides, which must be a
Bookbinding and its auxiliary branches . Roller BackiriK Machine. 106 BOOKBINDING the roller forward and back two or three times. Releasethe clamp by stepping on the treadle, and remove thebook. ROUNDING AND BACKING MACHINE (CROWLEY).The production of letterpress books by machine hadits beginning with the invention of the rounding andbacking machine. The laborious hand or roller backing. was thus eliminated. After the backs of the books havebeen glued up as described under Rounding, the booksare fed into the machine between a pair of rollers, theback resting against the guides, which must be accuratelyset. The upper roller descends on the book, the guidesrise up out of the way, and the rollers rotate sufficiently ROUNDING AND BACKING 107 to round the back and advance the book between a pair ofjaws which clamp it firmly and bring it in contact withan oscillating concave form. The former first touches theback of the book in the center; then, with several move-ments, pushes the signatures to the sides to form theridges — this is done without meshing or straining thesewing. When the back has been formed, the book is car-ried to the operator by the jaws, which release their the book is taken out, another book is fed inbetween the rollers to the guides which in this movementpush the former book out to grasp the one fed in. Thereturn of the book to the operator
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbookbinding, bookyear
