Patent GB-365270-A (GB)
Title: A method of and mechanism for separating books from an interconnected book-pad in a book-stitching machine
IPC: B42B2/02
Filed: 1930-12-15
Abstract: 365,270. Book - stitching machines. POLLAK, J. E., 20, Holborn, London.- (Brehmer, Geb. ; Plagwitz, Leipsic, Germany.) Dec. 15, 1930, No. 37789. [Class 112.] A book-stitching machine is provided with means for mechanically severing the backing material of an interconnected book pad. The invention is illustrated as applied to a machine of the swinging sheet-carrier type. The side frames 1 of the machine support pivoted arms 4 to which the saddle-shaped swinging carrier 6 is attached in the usual manner. This is shown in Fig. 1 in its stitching position supporting the book-section 50 beneath the stitcher head 7. A guide 77 positions a backing strip 9 above the section 50 for attachment by the stitches, the strip being tensioned by members 10, 11. After the last section is stitched, an idle locking stitch is formed and a grooved section block 51 inserted. The first section of the next book is then fed by the carrier 6 and a further complete book stitched, followed by a further grooved block 51. These blocks are supported on rails 51a so that the grooves of the blocks are located below the backing strip. A rod 21 extends parallel to the book pad trough and is slidably mounted in a bracket 48. It is periodically coupled at one end to the swinging carrier arm 4 by bolts 15 engaging slots 14. A blade spring 16 engages a shoulder 20 and urges the bolts 15 into the slots 14. The coupling of the rod 21 and arm 4 is only effected when it is desired to sever the backing strip. An uncoupling member 17 having a wedge-shaped end is slidably mounted on the rod 21 and engages the shoulder 20 to hold the bolts 15 clear of the slots 14 in normal position. A severing member 26 carried in a holder 27, Fig. 2, is slidably mounted on guides 28, 28a and is provided with a pilot member which serves to locate the cutting grooves of the section blocks for accurate engagement with the knife 26. The knife holder 27 is linked by the rod 29 to the lever 24 and is traversed thereby to cut the backing strip when the rod 21 is reciprocated. The automatic coupling and uncoupling of the rod 21 with the sheet carrier 6 is controlled in the following manner. An arm of the bell-crank lever 19 is slotted to receive a pin 74, by which it is connected to the lever 18 pivoted at its lower end to the frame. The lever 18 carries a finger 49 which passes through slots 73, 76 in the guide 51a. A member 86 carrying a cam follower 45 is slidably mounted on the upper part of the lever 18. This follower engages a cam block 47 so that during the rearward movement of the lever 18 about the pivot 85, the member 86 is lifted and the spring 46 placed under tension. The finger 49 is thus projected upwards through the slot 76. When the lever 18 is moved forward, the bell-crank lever 19 is rocked to couple the carrier 4 to the rod 21, which is reciprocated to effect cutting. The idle stitch mav be severed in the manner described in Specification 362,863 or the thread between stitched books by the mechanism described in Specification 362,828. The section blocks are dispensed with if no idle stitches are formed. the backing strip in this case being looped between each two books.