Patent GB-371399-A (GB)
Title: Paper napkin folding machine
IPC: B65H45/16
Filed: 1930-12-20
Abstract: 371,399. Making paper napkins. BURT, J. S., 217, Montgomery Street, Highland Park, New Jersey, U.S.A. Dec. 20, 1930, No. 38438. Convention date, Nov. 12, 1930. [Classes 100 (i) and 100 (ii).] Folding paper ; cutting - apparatus. - A machine for producing paper napkins from an embossed and printed paper web comprises a former, by means of which the web is folded longitudinally, and a rotary folder carrying gripper jaws co-operating with a tucker-blade to fold the web transversely, cutter-blades being arranged between the grippers and coacting with a stationary cutter-blade to sever the completely-folded part N<2>, Fig. 6, of the web from the succeeding part N<1> which is also held by gripper jaws and trails behind them. Two folding mechanisms are arranged end-to-end for dealing with two webs simultaneously, two formers 25, Fig. 1, being provided and the cutting and folding drum 40 having two sideby-side mechanisms for dealing with the two webs. Two diametrically-opposed recesses 41, Fig. 6, in the drum 40 accommodate jaws 43 which are held in place by blocks 51 and cooperate with a tucker-blade 60 rotating on a shaft 61 to impart transverse folds. The jaws 43 are pivoted at their inner edges in grooves 50 in the recesses 41 and are pressed together by springs 48. Between each pair of jaws is a flat rod 54 rotatable in bearings in the drum ends on the outside of which it carries roller-arms running on fixed cams so that the rod 54 is rotated at suitable times to open and close the jaws. Cutting-knives 63 are fixed by wedges 64 in recesses 42 spaced 90‹ from the recesses 41 and co-operate with an adjustable fixed blade 65 to sever the webs into sheets. Situated in grooves in the outer corners of the securing blocks 51 are perforated tubes 53 each connected by radial channels to axial channels in the shaft 39 of the drum 40. Air under pressure is admitted to the tubes 53 in advance of the jaws 43 and to those in the rear of the jaws at different periods by inlet pipes 74, Fig. 2, communicating with the axial channels in the shaft 39 and having valves 77 controlled by cams 82, 83 on the tucker-blade shaft 61. The air-blast from the leading tube is admitted in the position shown in Fig. 6, immediately after the operation of the cutters 63, 65, so that the free end N<1> of the web is blown away from the drum 40 and caused to trail behind the jaws 43. Air is supplied to the rearward tube 53 when the severed sheet is released by the jaws 43 and delivered by belts 32, 33, the blast being continued sufficiently long to hold the sheet in contact with the belt 33 until it is gripped securely between the two belts. Circumferential grooves 86 in the drum 40 facilitate the action of the air-blasts. The drum 40 and its associated tucking and cutting blades are mounted on a casting 34 removable from the machine base 36 so that mechanism for producing napkins of a different size may be substituted, if required. As shown, the drum is driven from a gear 85 on the shaft of one of the belt rollers 28 but any drive permitting of the removal of the drum may be employed. Delivery apparatus.-After the sheet has been delivered to the belts 32, 33 by the air-blast from the tube 53, it is carried upwardly over a roller 87, Fig. 2, and then vertically downward until it is stopped by an abutment 94 adjacent to a receiver 88. Fingers 95 oscillated from a crank disc on the shaft of the belt roller 28 push each sheet into the receiver. The abutment 94 forms part of a two-armed lever, one arm of which is engaged by a stop on a ratchetdisc 98 rotated by a pawl 102 oscillated from the tucker-blade shaft 61 so as to raise the abutment 94 at predetermined intervals and cause a sheet N3 to be displaced in order to separate the sheets in the receiver into counted batches. Embossing - apparatus; rotary printing- machines; tripping-arrangements.-The two webs W, W<1> of creped paper are drawn from rolls 14, Fig. 1, and are embossed and printed before folding. They first pass between primary embossing rolls 15, 16 which may be rendered inoperative by releasing the pressure between them. Secondary embossing rolls 17, 18 are provided for marking a name on the webs, if desired, but these rolls may be byepassed by either web by means of guide-rollers 19, 20. A multi-colour printing apparatus comprising an impression cylinder 24 and printing cylinders 23 is provided for each web, each printing cylinder 23 being movable away from its impression cylinder 24 so as to render it inoperative, if desired.