Patent GB-189920756-A (GB)
Title: Improvements in or relating to Envelope Making Machines.
Inventor: BOULT ALFRED JULIUS
Filed: 1899-10-17
Granted: 1900-01-13
Abstract: 20,756. Boult, A. J., [Cupples, S.]. Oct. 17. Envelopes.-Relates to an envelope machine, in which the blanks are cut from a paper strip, and are folded, pasted, and dried. Fig. 2 shows a plan, and Fig. 3 a vertical longitudinal section. The roll of paper 2 is carried on a spindle supported on the brackets 3 and having a threaded end 5 fitting the internally-threaded cone 6, and a notched end 7 on which fits the cone 8 provided with a spring-actuated pawl. The web of paper is directed to the machine, and irregularities in winding are compensated, by means of an adjustable rod 16, carrying a fixed head 18, and a loose spring-held disc 19. The rod 16 passes through a block on the shank 14, clamped to the arm 10, secured to the spindle 12, which is provided with a weighted arm 24, so that the roller 23 on the rod 16 is kept in contact with the paper roll 2. The paper is drawn over the roll 13, beneath the roller 26 of the printer 27, and over the rollers 28, 29. Gum is applied to the sides of the paper strip by the discs 31, which rotate in the stationary pot 32, and are mounted on the rock shaft 35 provided with a crank 36, carrying a roller 37 bearing on a suitable cam. The edges of the strip are folded over by a pair of grooved blocks 42, adjustably supported on the rod 43, which is suitably connected to the standards 51. The paper next passes between rolls 57, 58, which press the edge folds down, and the outer faces of the folds are gummed by the discs 63, which rotate in the pot 65 and are governed by the cam 70. After passing over the roll 62 and beneath the roll 79, the paper passes between the cutting-rollers 81, 82, of which the upper carries a V-shaped knife and a folding blade, and the lower carries a pair of clamps and two movable guide-pins, and is provided with a groove into which the paper is forced to form the transverse fold to the envelope. The gumming and folding roller 99 is made with a recess containing a cam-operated blade which is projected to force the paper into a recess in the roller 82 to form the flap fold of the envelope. The roller 99 is provided with two gumming-dies for applying gum either to the flap, or to the back of the envelope, as required ; the gum is supplied by a roller rotating in the pot 121. The form of blank is indicated by dotted lines in Fig. 24. After leaving the rollers 81, 82, the paper is received on to a stationary plate, where the corners H, Fig. 24, are clipped off along the lines J by a pair of revolving blades 138 acting in conjunction with blades fixed to the plate. The paper still held by the roller 82 is withdrawn from the stationary plate, and the part D, Fig. 24, forms the back of the next envelope. The completed envelope is transferred by suitable cam-actuated mechanism to a pair of parallel wheels 150 provided with bands which hold the edges of the envelope from the starting point 153 to the point 154, where the envelope is discharged on the belt 158. Hot air for drying the gum is discharged through the perforated pipe 185.