Patent GB-440027-A (GB)
Title: Improvements in or relating to envelope making machines
IPC: B31B19/00
Filed: 1934-05-16
Abstract: 440,027. Making envelopes. SMITHE MACHINE CO., Inc., F. L., 633, West 44th Street, New York, U.S.A.-(Assignees of Novick, A. ; Flushing, New York, U.S.A.) May 16, 1934, No. 14801. Convention date, May 18, 1933. [Class 94 (ii)] A machine for making envelopes comprises in combination with means for scoring a blank longitudinally and transversely thereof and for folding the side flaps of the blank, of frictional conveying means for transporting the blank thus acted upon to means for folding an end flap mounted on a rotary drum, provided with blanksecuring means, which are adapted to accomplish the fold irrespective of any deviation in registry of the score lines with the end-flap folding means normally imparted by the frictional feed. Blanks fed in from the right, Fig. 2, are scored transversely by removable blades 2, 3, and scored longitudinally by blades 4, are then conveyed by friction rolls 5 through the usual side flap gumming and folding mechanism (not shown) beneath stationary guide shoes 12<a> to the drum 16, 17 wherein the further gumming and folding operations are performed. Pivoted camoperated spring urged forward grippers A move to hold the forward end of the partly folded blank to the drum while, subsequently, trailing grippers B, also cam-operated, move to secure the blank further to the drum. The grippers A and B are attached to two side sections of the drum and adjustable longitudinally of the main shaft 15 to permit of the making of different sizes of envelopes. The bottom and sealing flaps are gummed by a device C which consists of two separate gum applying surfaces 70, 71 taking supplies from two separate sources 81, 82 each containing gum of the appropriate kind for the bottom flaps and sealing g flaps respectively. The gum applying surfaces 70, 71 are spring urged and are retracted by cam action when passing the applicator roll of the other source of supply. For rendering the gum applying device inoperative when a blank is not present a feeling device D is provided. This device consists of a reciprocating member 100 terminating in an apertured portion 101 within which registers a lower reciprocating member 102. When no blank is present to prevent it from doing so, the member 102 moves through the aperture 101 thereby freeing an arm 110 from a catch, which through arms 115, engages the cam followers of the gum applying surfaces 70, 71 to prevent them from smearing gum on to the drum. Fingers E, movable through slots in the drum and cam actuated, initiate the folding of the bottom flap aided by the grippers A which are disposed at about # in. from the score line. The grippers A are then removed and the fold is pressed by a spring-urged presser F, provided with a releasing finger 132, and the forward end of the envelope is moved away from the drum by ejector fingers G, and ironed at H, 143, 140. The grippers Bare then removed as cam-operated grippers 150, carried by a chain I, move to take hold of the forward end of the envelope. The chain is driven by adjustable elliptical gears so that it moves slowly as the grippers 150 first come into operation. Adjustable transverse scoring devices may also be provided, coacting with the drum 16, 17 where it is desired to produce safety envelopes, i.e. envelopes in which the folds of the bottom and sealing flaps include a portion of the side flaps, Figs. 26, 27. In this case the scorers 2, 3 are disabled,