Patent GB-1181443-A (GB)
Title: Improvements in or relating to devices for severing sheets.
Inventor: SARGENT ALBERT AMOS
IPC: B65H35/10
Filed: 1967-05-22
Abstract: 1,181,443. Severing by tearing. LAMSON PARAGON Ltd. 22 May, 1967 [16 June, 1966], No. 23622/67. Heading B4B. A device for successively severing sheets or business forms S from a web W preferably having spaced transverse weakened lines comprises a common back-up roller 22 and feed and pull rollers 23, 21, respectively, means being provided for guiding the lead end of the web from between the rollers 22, 23 to introduce it between the rollers 21, 22 to form a bight in the web, and means being provided for rotating the roller 21 at a faster rate than the roller 23 whereby the successive lead portions of the web are severed therefrom. The roller 22 comprises a series of sections 35, Fig. 6, some of which register with ridges 25 on the roller 23 and the others of which register with ridges 45 on the roller 21. The rollers 21, 23 have drive-sprockets 46, 30 the speed ratio of which accords with the length of sheet to be severed. The action of the roller 21 brings the bight of the web into tearing contact with a burster blade 60 adjustably secured to end sections 38 of the roller 22. The means for guiding the lead ends of the web to the action of the roller 21 comprise a semicylindrical vane 64, side plates 66 and upper and lower series of guide rods 68, 69 along which the vane is slidable. The vane has associated therewith pins 78 which each pass through a link 79 of one of a pair of endless chains 80 which each pass around sprockets 82, 83, the sprocket 82 being manually rotatable to adjust the position of the vane thereby adjusting the length of sheet cut off. The vane, guide rods and side plates form a basket device which is swingable about the shaft 31 of the roller 23 to position the device for access to its interior, the device being locked in its upper position by means of a cross-bar 85 fitting into notches 86 in the upper edges of the plates 66 and in its lower position by means of hooks 88 projecting from the plates 66 and abutting the axle 50 of the roller 21. In-feed mechanism comprises a shaft 100 on which is mounted a drum 101 above which is a shaft 102 having two sets of cranks 104, 106 carrying rollers 105, 108, respectively. Adapted to press against the drum are brushes 110 each mounted in a holder 111 pivotally mounted on a rod 112 carried on a crank 114. Secured to the shaft 100 are a gear 125 and cams 126, 127. The shaft 31 has a cam 135 mounted thereon. The gear 125 meshes with gears 130, 131 and 133, and the gear 131 meshes with a toothed segment 145 formed on a brush-carrying crank 114. When the parts are in the load position, Fig. 3, the web is led around the drum 101 and tucked beneath the temporary bearing roller 105 and fed between the rollers 22, 23, the roller 23 being in its inoperative position. When a hand crank 120 is moved from the position shown in Fig. 3 to that shown in Fig. 4, the roller 23 is brought into its operative position to seize the lead end of the web and at the same time, the brushes 110 contact the web on the drum 101 and the roller 108 rises so that the web is carried in zig-zag fashion around the shaft 102 and roller 108 before it passes to the bite of the rollers 22, 23. The sheets cut from the web are delivered to belts 170 driven from a sprocket 48 on the shaft 50 of the roller 21.