Patent GB-902811-A (GB)
Title: Manufacture of gusset type envelopes
Inventor: NORMANDIN WILLIAM OMER
IPC: B65D30/20
Filed: 1959-04-09
Abstract: 902,811. Making gusset type envelopes. CANADA ENVELOPE CO. April 9, 1959. No. 12049/59. Class 94(2). Relates to improvements in envelope making machines and comprises additions and modifications made to the existing mechanism of a standard envelope making machine whereby envelope blanks are completely creased, folded and adhesively secured in a continuous sequence to produce gusset-type envelopes. The additions chiefly comprise scoring means to pre-set the lines of the folds and means to fold the blanks into gusset-type envelopes. The blanks are specially designed, a blank in the shape A, Fig. 8, resulting in an envelope as shown in Fig. 1, and a blank in the shape A1, Fig. 16, resulting in an envelope as shown in Fig. 10. The blanks are seared during their passage to the main folding arrangement. Two groups of three, spaced, scoring discs 14a, Fig. 26, are mounted on sleeves 52 on the ends of which are flanges 58 which fit in grooves in collars 64. The collars 64 can be shifted along the shaft 54, to which the sleeves 52 are keyed, by rotating shaft 61 which are screw-threaded through the collars, so adjusting the distance between the sets of scoring discs for the score lines F. A scoring roller assembly, Figs. 31, 32, 35, 36, comprises two supports 78, 82 fixed to a shaft 75, the latter by split collars 92, allowing for adjustment round the shaft. On the outer end of the support 78 a tripleblade set 70, Fig. 32, is bolted, comprising three blades 71 with resilient strips 77 between them. On the outer end of the support 82, blades 73a, 73b, Fig. 35, are bolted and the blade 73b has tapped openings 89 for the attachment of opposed diagonal blades 74, Fig. 36. Arcuate segments 79 project from the support 78 and arcuate segments 84 from the support 82, and combine with the resilient strips 77 and a roller 80 to feed the blanks as the shaft 75 rotates. The blades 71 score lines G, G1, G2 across the width of the blank, the blades 73a, 73b score lines H, H1 and the blades 74 score diagonal lines I, I. The relative positions of the blades are adjustable and the circumferential distance between the blade sets can be altered, by moving the support 82, to suit varying envelope sizes. For the blank shape A1, a single blade is substituted for the two blades 73a, 73b to score the line G1 only, the line G being scored later. After being scored the blank is conveyed, by a top blank guiding carriage 18 with guide roller units 146, and driving rollers 20, Fig. 29, to the folding blade sets 22, 24, first encountering guide bars 30, 32 which fold the side flaps E to a vertical position. The blade sets 22, 24, which are opposite one another, are similar and their spacing is adjustable by moving standards 96, on which they are mounted, to and from one another by an opposite-handed screw-threaded shaft. The guide bars 30, 32 are also adjustably mounted. The horizontal part of the blank next to the score lines F then passes under lower folding blades 106, Figs. 18, 24, which, with the whole system of folding blades, are the same on both sides of the machine. The gussets are then folded along the score lines F, as the blank is passed along beneath the blades 106, by the co-operation of the blades 106 with a series of opposed blades 112, 114, 110, 108, 116, 118, the successive foldings along the score line F being shown in Figs. 19, 20, 21, 22, 23. As the blank proceeds, the guide bars 30, 32 keep the flaps E substantially vertical and then fold them over to overlap one another, adhesive having already been applied. The overlapped flaps and folded side gussets then pass under pressure leaves 136, flattening the gussets, and a set of rollers 138. The partially finished envelope then passes round a roller 40, where adhesive is applied by existing means and grippers 40<SP>1</SP> co-operate with standard folding fingers to fold up the bottom flap D, which is then pressed down by a rockeractuated pressure arm 42. At this point the machine may be slightly modified for the blank shape A1 by the addition of a blade, mounted on a shaft, and actuated to score the line G in Fig. 16. The envelopes pass back along the conveyer belt 44, where the adhesive for sealing the top flap C when the envelope is used is applied, and they then proceed along a circuitous path to dry the adhesive and are finally stacked. To allow for the increased frictional resistance of the folded gussets the existing blank guiding carriage is modified by providing additional rollers 20 and guide roller units 146.