Patent GB-191322398-A (GB)
Title: An Improved Envelope Making Machine.
Inventor: FAIRBROTHER HENRY
IPC: B31B23/00
Filed: 1913-10-04
Granted: 1914-04-16
Abstract: 22,398. Fairbrother, H., [Mercantile Corporation]. Oct. 4. Envelopes, making.- In a machine for making envelopes, a web of paper is cut into shaped blanks, which are then gummed and folded. A web of paper from a roll 31, Fig. 1, passes around guide-pulleys 35, 36, 37, and then in succession around two rotating cutting - cylinders 40, 50 which notch the edge of the web as shown at I, II, Fig. 25. The cutting-devices consist of a number of dies 38, Fig. 4, in the edges of the cylinder, and a number of cutters 44 revolving on shafts 43, Figs. 1 and 4, mounted in bearings on the ends of the cylinders. The shafts 43 are rotated through intermediate shafts 53 from a bevel-wheel 56 fixed on the bearings of the shafts of the cylinders. Annular hoods 57 fixed on the ends of the cylinders cover the rotating cutters, and are connected with suction pipes 63 through which the paper cuttings are drawn. The web is next led beneath a rotating cutter 70, Fig. 1, which co-operates with a fixed cutter 68 to make a cut III in the middle of the web. The cutter 70, Figs. 1 and 6, consists of a number of rings 73 to which one or more cutters 74 are adjustably attached. T h e rings are mounted between two presser-disks 75 on a sleeve 670, and are locked between clamp-nuts 660. The disks 75 are provided with small feet 75<a>, 76<a> which press the web close against the fixed cutter 68 and prevent the cut III from extending across the web. A second cut IV is made on the web by a cutting- device 80 similar to the cutter 70, and the scrap now removed from the web is drawn into a suction pipe 77. The web next passes between the principal feed-rolls 84, 85, of which the upper one 84 is mounted in eccentric bearings which enable the roll to be lifted to facilitate threading the web between the rolls. A revoluble cutter 95 similar in construction to the cutter 70 severs the web along the line V and separates the blank. The web is fed beneath the cutter 95 by pairs of small rolls which grip the edge of the web and have a circumferential velocity slightly higher than the speed of the web in order to prevent slackness of the web. After being severed from the web, the blanks are carried off at an angle, as shown in Fig. 25, to the gumming and folding mechanism. Each blank as it is fed forwards is gripped by grippers 148, Fig. 12, on a receiving-cylinder 130, and is carried round by the cylinder beneath rotating segmental disks 162, which press the blanks into grooves on the cylinder and form the creases VI, Fig. 25. Segments 138 mounted above the cylinder 130 assist in feeding the blank and prevent the blank from buckling on the cylinder. A transferring-cylinder 156 similar in construction to the cylinder 130 receives the blank from the latter and conveys it to the folding-cylinder 170, where the first part of it is engaged by grippers on one of a number of flat faces or folding-beds formed on the cylinder. An oscillating arm 190 lays the blank flat on the cylinder before the back part is engaged by grippers. Folders pivoted to the sides of each folding-bed fold the side flaps of the blank as at VII, Fig. 25. The rotation of the cylinder 170 then carries the blank under gummers 231, 232 which gum the flaps as at VIII, Fig. 25, and under rotating blades 238 which crease it as at IX. The bottom flap is then folded as at X by means of folders which are pivoted in recesses in the folding-bed, and the envelope is then transferred to a cylinder 241 which carries it beneath a pressing-roll 252. A delivery cylinder 270 takes the envelope from the cylinder 241 and delivers it between travelling drying-belts 264, 265. The belts deliver the envelope to a pair of rolls 284, 286, Fig. 24, of which the upper one is mutilated, as shown, and which deliver it against a stop 353. A similar pair of rolls 285, 287, which rotate in the reverse direction, then come into action, as shown, with the result that the envelope is buckled and forced between the rolls 284, 285 by which the sealing-flap is folded and pressed.