Patent GB-1031934-A (GB)
Title: Improvements in stationery bursting machines
IPC: B41L1/00
Filed: 1963-07-18
Abstract: 1,031,934. Severing by tearing. UARCO Inc. July 18, 1963 [July 19, 1962], No. 28486/63. Heading B4B. A machine for separating continuous stationary having transverse lines of weakening into lengths comprises a first pair of rollers 16 having surfaces which are normally in contact and a number of irregularly-spaced recesses 124 to allow the stationery to pass freely through the rollers, a second pair of rollers 18 having surfaces which are normally in contact and at least one recess 98, and means whereby the first pair of rollers is driven at a reduced speed relative to the second pair of rollers, the speeds of the rollers being such that a recess in the first pair of rollers is presented to the stationery whenever a recess in the second pair of rollers is presented to the stationery. The stationery is fed to the machine from a zig-zag folded stack 12 by a pair of infeed rollers 38, 40, roller 38 being driven by a worm-and-wheel arrangement 48, 50 from a shaft 32 connected by a worm-and-wheel arrangement 29, 30 to the lower roller 94 of the second pair of rollers 18, and roller 40 comprising discs mounted on a shaft 42 guided for vertical movement in slots 43, 43a. The roller 94 is driven by a belt 24 from a motor 20 and is connected by gearing 85, 86 to its associated roller 92, the bearings 78 for the latter resting on springs 77a. Both rollers 92, 94 are formed with circumferentially relieved areas 90 to provide clearance for upper and lower guides 56, 58 for the stationery, and the upper roller 72 has a series of flats 98 extending between its end portions 95 whereby the stationery can pass freely through the rollers at certain rotary positions thereof. The first pair of rollers 16 comprises upper and lower rollers 102, 104 similar to the rollers 72, 74, the upper roller, however, having two series of flats 124 diametrically opposite. The rollers 102, 104 are driven by gearing 110, 112 from the shaft 32 at half the speed of the rollers 72, 74, the rollers being arranged so that when the flats on the roller 72 are presented to the stationery, one of the series of flats on the roller 102 is also presented to the stationery. In other positions of the rollers, the stationery is subjected to tension as a result of the difference in speeds of the pairs of rollers to separate the stationery into lengths along the lines of weakening, the stationery while under tension being stretched over rollers 132 mounted on a shaft 134 secured to the housings 106, 106a for the rollers 102, 104. The housings 106, 106a are movable to adjust the spacing between the pairs of rollers 16, 18 by a motor having a worm 144 engaging a wheel 146 connected to a shaft having toothed portions 148a engaging racks 34, 36 extending longitudinally of the machine. The stationery is guided through the machine by the guide means 56, 58, the lower guide comprising rods 56a which extend between clamps 61, 64 and rods 56b which extend from the clamp 61 and pass through the spaces between the relieved portions of the rollers, the ends of the rods being bent as shown at 57d and resting against securing means 62. The upper guide comprises resilient tapes 58 which, at one end, are secured to a rod 66a, and, at the other end, are adjustably held by clamps 70 to a rod 66 whereby the resistance to upward movement of the stationery as it passes through the machine is varied.