Patent GB-169209-A (GB)
Title: Machine for cutting and interfolding sheets of paper and the like
IPC: B65H45/24
Filed: 1920-05-20
Abstract: 169,209. Straubel, L. A. May 20, 1920. Folding paper.-In a machine in which sheets of paper for toilet papers, towels, &c. are cut from two webs and interfolded by two folding members from which they are delivered in zigzag relation, the folding members oscillate simultaneously to effect the folding and delivery of the sheets. An improved marking device is provided to mark the folds of the product at predetermined intervals. The web rolls are arranged on one side of the machine and pass separately between feed-rolls 9, Figs. 3 and 9, and bed rolls 7 and pass together between guides 9<1> to the folding members. The webs are slit longitudinally by slitting discs 10 working between sections of the feed-rolls 9, and are cut transversely by blades 18 carried by sleeves 16 on adjacent shafts 15. The blades 18 of each pair of shafts 15 are arranged to act successively on the same transverse line of the web to produce a single cut with small connecting ties between the sheets. The sheets are guided by means of rollers 23 rotatable upon eccentric sleeves 22 mounted on a non-rotatable shaft 20 and adjustable to make proper contact between each of the rollers 23 and its corresponding bed roll 7. The shaft 20 is pressed downwardly by springs. The folding members each comprise end discs 29 fixed to stub shafts 24, Fig. 10, and connected by an arcuate wall 30 and a radial wall 31. The shafts 24 are oscillated through about a right-angle by crank mechanism from continuously rotating shafts 28. The fold-forming devices comprise a pivoted spring-pressed sheet-bending finger 32 and a tucking-blade 41, co-operating, as shown in Fig. 10, with a clamping lip 37 on a plate 35, Fig. 3, slidable on the wall 31 and adapted to be moved by springs 38 to clamp the fold against the wall 30. The plate 35 is moved outwardly to release the sheets by a cam mounted on the shaft 24 and oscillated by an eccentric rod 44 from the shaft 28. As the folding-member moves to carry the fold downwardly, the pull on the, sheets severs the ties between them and the following part of the webs. The folded sheets are stripped from the folding members by cam-operated fingers 48 which press the sheets on to delivery chains or belts 58, the sprocket wheel 59 of which is operated intermittently by ratchet and pawl gear. A mark is made on the edge of a fold at intervals by marking fingers 65, Fig. 5, which pass through openings 66 in certain of the stripping fingers 48 and each finger 65 is connected by a link 67, Figs. 3 and 5, to an arm 68 fixed to a shaft 69 to which is secured an arm 70, the nose 71 of which is held in contact with the peripheries of a pair of adjacent ratchet wheels 73, by a spring 74 acting on an arm 75 of the shaft 69. The ratchet wheels 73 are driven step by step in opposite directions by means of pawls operated by links from one of the bed roll shafts 6 and once during each revolution notches 77 in their peripheries are brought into alignment with the nose 71 allowing an inward movement of the nose 71 of the arm 70 and causing an outward movement of the marking fingers 65 to engage and mark the fold of the sheet. In a modification, the stripping fingers 48 are provided with cam-operated rocking spring strips acting to grip the sheets against the fingers 48 during their delivery.