Patent GB-381978-A (GB)
Title: Improvements in or relating to mechanism for separating books from an interconnectedbook-pad in a book-binding machine
IPC: B42B2/02
Filed: 1931-07-21
Abstract: 381,978. Book-stitching machines. POLLAK, J. E., 20, Holborn, London.- (Brehmer, Geb. ; Plagwitz, Leipsic, Germany.) July 21, 1931, No. 20849. Addition to 365,270. [Class 112.] The backing material connecting adjacent books of an interconnected book pad is looped and severed mechanically between adjacent books. If additional interconnecting stitches between adjacent books are provided they may be cut before, after or at the same time as the backing. In the form shown in Fig. 1, opened sheet or book sections are placed straddlewise on the stitching saddle a of the swinging carrier by a sheet feed unit B and is carried beneath the stitching means S. One or more continuous backing strips b are fed through guides to the sewing point-and are secured together to form a continuous book pad C which is progressed along a trough d past laterally positioned separating and severing devices. Timing mechanism comprising ratchet teeth n, adjusted according to the number of sections or sheets constituting a complete book, is actuated, after stitching of a final book section and formation of an idle stitch which connects consecutive books, to set in motion rack gearing to raise pivoted arms 10 and carry one of a series of rods e moving in a cyclic path which includes upper and lower tracks 11, 13 respectively from the lower to the higher and insert it behind the last section of a book. The backing strip b between adjacent books is looped as at b<1>, Fig. 8, and upper and lower cutter guides 49, 50, Fig. 7, carried by a slide rod mounted in guides adjustably supported on the machine frame, together with a cutter 59, mounted between the guides 49, 50, and an auxiliary divider 56, which maintains continuity of the forward edges of the guides 49, 50 the lower of which is in advance of the upper, are inserted laterally into the space between adjacent books above the rod e, a nose 57 on the upper guide 49 opening out the loop b<1> as in Fig. 8. The lower guide 50 is then moved upward to clamp the loop b<1> and the cutter blade 59 is actuated by the engagement with stops 15, Figs. 1 and 3, interposed periodically in the tracks 11 of a rod e to sever the loop b<1> along the line of fold. The interconnecting threads may be severed by rotating knives and the guides 49, 50 and cutter 59 are then withdrawn from the pad. The stops 15 are now raised from the tracks 11 so that the separated book, the rod e and the book pad may resume progress along the trough d until finally the foremost book reaches the delivery end of the trough and is removed. A thread extracting device as described in Specification 372,974 may be positioned at the delivery end to extract the severed interconnecting threads. The released rods e are fed along the upper guide track 11 and down an inclined track 11b, Fig. 3, to rest against retaining members 16 which lift them periodically into notches 21 in a disc 17 and between pushers 22 on a continuously moving chain 18 by which they are deposited behind flaps 24 in the upper path of continuous chains 19. Pushers 26 on these move the rods e to the forward end of the lower tracks 13 to hooked holders 12 on the arm 10 for a further cycle of movement. In a modified construction, shown in Fig. 17, separating and severing mechanism engages and severs the backing material after the interconnecting stitches between books have been severed by means, for example, of a device such as that described in Specification 362,864, and the threads have been extracted bv means such as those described in Specification 377,110. The stitched books connected by backing strips b progress along the trough d until the foremost book encounters stop plates 113 lowered into its path and carries them forward until they are arrested by a set-screw 114. Needles 110, 111 carried on vertically slidable needle bars 142, 143 are so set that in this position they will when lowered engage adjacent end sections of adjacent books. The needle bar 143 is then moved forwardly, the stops 113 having first been raised, to separate the adjacent books. Cutter guides 49, 50 and a cutter 59 are introduced and operated as in the previous construction to sever the strips b.