Patent GB-735773-A (GB)
Title: Improvements in bookbinding
Inventor: KITCAT ALFRED JAMES
IPC: B42C5/02
Filed: 1952-12-08
Abstract: 735,773. Bookbinding. BOOK MACHINERY CO., Ltd. Nov. 27, 1953 [Dec. 8, 1952], No 31120/52. Class 16. [Also in Group VIII] In a bookbinding machine in which book signatures are fed along a table by conveyor means past a rotary cutter head between the feed in end of the machine and glue applying means, the axis of the rotary cutter head being substantially normal to the plane of the back edges of the work and the head carrying a plurality of spaced apart distinctive sets of teeth projecting towards the work in directions substantially parallel with the axis, there are provided more than four sets of teeth and each set comprises teeth formations along one edge of a rigid bar-like piece of hard durable material such as e.g. tungsten carbide. The machine frame 1 supports a table 3 along the top of which book signatures 2 are fed by conveyor belts 4, 5 to overhang a metal insert strip 6 for engagement with the teeth 45 of a rotary cutter head 7 which remove the folds of the signatures and fibrillate the edges for better binding by the synthetic or other glue. A gauge (not shown) engages the front edges of the books to maintain them in position. The cutter head 7 is carried by a shaft 9 journalled in bearings 10 in a casting 11 angularly adjustably fixed to a crossslide 12 having a dovetail groove slidable in a dovetail in a fixed base plate 15 secured by studs to the horizontal top flange 16 of a main housing 16 secured by integral brackets bolted to the machine frame 1 and a column arm 23 and having a removable cover plate 37. A suction vent chamber 24 at the rear of the housing 17 has a mouth 26 communicating with the space inside a cover guard hood 28 directly under the cutter and a suction conduit 25a at the lower end for removing the particles cut off by the cutter 7, the chamber 24 having a removable cover plate 25. The guard hood 28 is of inverted U-section bolted to the base plate 15 and has a removable cover plate 29 to give access to a cam 31, rotatable on a bolt 32 fixed in the base plate 15, which operates in a slot in the cross slide 12 to adjust the slide and cutter head 7 relatively to the work. The shaft 9 of the cutter head 7 carries a pulley 36 driven by belts 35 running over a pulley 33, in the housing 17, fixed to the shaft of a motor 38 supported by brackets 39, the base plate 15 and slide 12 being cut away to accommodate the belts 35. To remove loose particles following the action of the cutters, a vertical axis rotary brush (40, not shown) is mounted alongside the cutter in an integral extension of the guard hood 28, and the brush is rotated at a slow speed from the main shaft of the machine. Brushes 63 secured to the top and sides of the hood 28 are arranged to lightly contact the work and confine the removed material to the hood. Each cutter element comprises a bar 44 having three teeth 45 along one edge with their cutting edges 47 arranged out of the perpendicular relative to the vertical edges of the bar as shown in Fig. 8, the teeth being stepped up to the rear by the base being angled. The cutter head 7 is provided with eight equally spaced webs 49 each having a flat face 49a against which the side of the bar 44 is pressed by a clamping bar 51 having a recess 52 into which the bar 44 fits. Each clamping bar 51 has a depending lug 53 with a centre thread 54 through which an adjusting screw 55 can be turned to clamp the bar 44. The screw 55 has an unthreaded end part 56 rotating in a radial hole 57 and the screw passes through a coaxial radial hole 57, the screw 55 and lug 53 lying in a radiating slot 59 cut into the rotor disc, and the outer end of the screw has a knurled head 60 with a shaped recess 61 for a key to apply the final clamping pressure. Specification 656,931 is referred to. In the Provisional Specification, Specification 723,652 is referred to.