Patent GB-327272-A (GB)
Title: Improvements in zigzag pile forming machines
IPC: B65H45/20
Filed: 1929-03-18
Abstract: 327,272. Smith, W .H. March 18, 1929. Folding paper - In zig-zag pile-forming machines of the kind wherein a paper web is passed between a pair of feed-rollers provided with creasing means, whereby the web is creased at spaced intervals in opposite directions and deposited in superimposed folded lengths with the aid of pivotally mounted stripper fingers moving alternately into contact with the feed-rollers and the upper face of the, pile, the web is drawn under tension between the rollers, fed slack therefrom, and creased on the line of the nip of the rollers, so that extra, paper for forming the crease is taken from the slack portion below the line of grip. Co-operating pressing-devices are also provided for pinching each fold along its crease line as it is laid on the table. The feeding and creasing- rollers 13, 14, Fig. 1, are mounted on shafts 11, 12 between end plates 6, 7 supported by brackets 6<a>, 7<x> upon bars 3<x> 4<x> extending rearwardly from the printing-machine from which the, web is received, the rollers 13, 14 being rotated continuously by gear wheels on the shafts. A series of annular grooves 13x, 14<x> respectively are provided in the rollers 13, 14, and, in addition V- shaped grooves 16, 16<x>, Fig. 4, disposed diametrically opposite to recesses 16<0>, 16<1> extend longitudinally of the respective rollers. The recesses 16<0>, 16<1> contain bars 17, 17<x> which normally lie within the peripheries of the rollers and can be reciprocated radially within the, slots, the outer edge of each bar being formed of inverted V-shape to co-operate with the grooves of the adjacent roller to effect the creasing of the web. The bars 17, 17<x> are actuated by curved links 23<x>, Fig. 5, secured to their ends and connected to one arm 23 of a bell-crank lever pivoted on a shaft extending longitudinally through the roller, the other arm 22 of the; bell-crank being adapted to coact with a cam projection on a bar 19 secured adjacent to the end plate 7 of the roller supporting frame. The side plates 6, 7, Fig. 1, of the frame are connected near their front and rear portions by bars 10, 10<x> which support hanging bearings 27, 28 for rocking shafts 29, Fig. 1, carrying stripping and pressing fingers 29<x>. The fingers, 29<x> project through the shafts 29 wherein they are secured adjustably at one end by screws 30, their other ends extending forwardly beneath the rollers 13, 14, so that when the shafts 29 are rocked outwardly the fingers engage within the annular grooves 13<x>, 14<x> to strip the web from the rollers and guide it on to the pile. The shafts 29 are rocked alternately by cams on the ends of the roller shafts 11, 12 co-operating with links connected to arms on the ends of the shafts 29, and springs 43 return the latter to their initial position. After each fold is effected its edge is pressed by one of a pair of plates 54, 55 mounted on pairs of arms 51, 52 carried on shafts 47 on opposite sides of the pile-support. The pressing-plates are of similar construction, and, as shown in Fig. 8, the plate 55 is mounted on lugs 56, 57 on a rocking shaft 53 which is journaled within the arms 51, 52 on a sleeve secured to the shaft 47, a leaf-spring 58 on the lug 56 tending to hold the plate, against loose motion. The shaft 47 is rocked at intervals and the arms 51, 52 swing inwardly whereby the lower part of the lug 57 is brought against a stop 82<x> on a bracket 82 secured to the side frame of the pile support and the pressing-plate is swung down and presses upon the edge of the pile. The plate remains in this position until' the next fold of the pile is brought upon it by the fingers 29<x>, whereupon the arms 51, 52 are swung outwardly and the folded edge is caught and pressed between the pressing-plate and the downwardly moving fingers, the plate being then carried rearwardly. In the rearward movement the arm 57 engages the end of a set-screw 83 on the pile-supporting frame, and the plate is tilted upwardly to ensure that on its return movement it engages the last fold made. When light paper such as tissue paper is being folded an air blast is provided to ensure that it folds along the creases, the air being directed from apertures in a transverse pipe 102, Fig. 1, connected by a tube 101 to a pistonvalve. An air-pipe 102 and piston-valve are provided at each side of the pile, and the valves are operated alternately to pass air from a, main 86 to branch pipes 88, 89 connected to the respective valves. The pile-supporting table is secured to an arm 63, Fig. 1, carried by a slide 64 guided on one of the legs of the machine, a divided nut 68 on the arm 63 being engaged by a feed-screw 65 which, at its upper end, carries ratchet mechanism co-operating with a pawl 71, Fig. 5, controlled by a iink 76x connected to a rocking-shaft 73, whereby the feed' screw is rotated and the table is lowered) as the height of the folded pile increases.