Patent GB-191411525-A (GB)
Title: Improvements in Envelope Making Machines.
Inventor: FAIRWEATHER HAROLD GEORGE CRUI
IPC: B31B50/25
Filed: 1914-05-09
Granted: 1914-08-27
Abstract: 11,525. Fairweather, H. G. C., [Schmidt, F. L.]. May 9. Envelopes, making.-Relates to machines for making envelopes from cut blanks, and consists in providing means for adjusting the distance between the devices for creasing the flaps, means for straightening and centring the blank as it passes through the machine, means for adjusting the position of the gumming-device, and a special construction of gumming-device. The blank with its side flaps folded is fed on to conveyer belts 7 which carry it beneath the sealflap creasing device, which is mounted on a carriage 33. This carriage rests on slides 9 running longitudinally of the machine, and it may be moved by turning a shaft 37 carrying pinions 34, which engage racks 38 fixed to the frame of the machine. The creasing-device consists of a shaft 14 carrying a blade 12 which coacts with a grooved roll 11. The belts 7 pass around pulleys 21, 23, 25 carried by shafts mounted on the carriage 33, so that the same belts convey the blank to and from the creaser, as shown and the tension of the belts is not altered when the carriage is moved along the slides 9. There are two belts 7, the rollers of one of them being fixed to the shafts, while the rollers of the other are adjustably mounted on the shaft so that the distance between the belts may be altered. The blank, as it leaves the creasing-device, is straightened by means of plates 50, which are mounted one on each side of the path of the blank on bars 52, which can slide transversely of the machine. The plates are held away from the path of the blank by springs; but cams 55 carried by arms fixed to the creaser shaft 14 engage the ends of the bars 52 and force the plates 50 inwards so that they engage the edges of the blank should it have deviated from its path and straighten it. The bottom flap is creased by a blade 59 which is carried by a shaft 60 and coacts with a grooved roll 57. This roll 57 has a circumferential speed slightly lower than the speed of the blank, so that the front end of the blank engages and is retarded by a stop 63 fixed to the roll. The blank is thus correctly positioned relatively to the creasers. Just behind the creaser 59 is a gumming-bar 66 also carried by the shaft 60, which receives gum from rotating pads 95 and applies it to the envelbpe. Both the bar 66 and the part of the roll 57 with which it coacts are serrated, the projections or feet 67 on the one facing the spaces on the other, as shown in Fig. 6. Thus no gum is deposited on the roll 57 if a blank fails to feed. Stripping-fingers 70 lie in the spaces between the feet 67 and are carried by a bar 71, which is secured to levers 72 pivoted on hubs secured to the shaft 60. The levers 72 are rocked periodically by fixed cams 81, and the fingers strip the blank from the gummer. The hub 115 of the gum-pads 95 may be adjusted on its shaft so that the effective length of the pads may be suited to the size of envelope being made. The blank next passes beneath a rod 99 which turns down the bottom flap on to the gummed body, and a roller 101 mounted on a lever rocked by a cam 107 presses the flap firmly against the body.