Patent GB-497237-A (GB)
Title: Improvements in and relating to cigarette paper feed
IPC: A24C5/18
Filed: 1937-06-18
Abstract: 497,237. Cigarette-making machines. AMERICAN MACHINE & FOUNDRY CO. June 18, 1937, No. 16987. Convention date, Aug. 28, 1936. [Class 130] [Also in Group XVI] In a continuous-rod machine in which means coacting to form a cigarette rod, such as a continuously-travelling rod-forming tape, serves to pull a wrapper web from a supply roll, a tension-control device is arranged between the web pulling means and the supply roll, the control device being responsive to variations in the tension of the web to correct abnormal tension. As shown, the cigarette-paper web W passes from a supply roll R, around a guide rod 24 which is axially adjustable and provided with flanges, over a continuously-driven feed roll 25, beneath a floating rod 26 which is carried by an arm 58, over an idler roll 27, and thence to a printing-drum 29. The web then passes through tipping-mechanism to a table where tobacco is fed on the web, and through rod-forming means which includes a continuously driven tape adapted to pull the web from the supply roll R. The cigarette rod is subsequently cut into cigarettes by a cutting- mechanism. The arm 58 carrying the rod 26 is adjustably secured to a shaft 59 carried by a bracket 60, and the shaft is provided with an eccentric portion 61 on which is rotatably mounted a rubber-faced roll 62. When the machine is operated at low speed, the pull on the web is relatively small, and the rod 26 forms a deep loop L in the web and holds the roll 62 awav from the driven feed roll 25. When the pull on the web increases, the loop L becomes smaller, and the roll 62 coacts with the roll 25 to feed the web from the supply roll R at a slightly higher speed than that of the pulling tape, so that the loop L is gradually restored, and the roll 62 moves away from the roll 25. In a modification, the arm 58 is loosely pivoted on the shaft 59, and presses under the action of a spring on an adjusting-screw projecting from a lever which is secured to the shaft 59, whereby the roll 62 cannot be pressed too hard on the web on the driven roll 25 in the case where the rod 26 is lifted too high due to high acceleration of the web caused by sudden starting or excessive speed of the machine. The tipping- mechanism is of the kind in which a web of tipping-material is drawn continuously from a reel by a pair of feed rollers at a speed which is less than the speed of the cigarette-paper web W and the web is then cut into sections by a knife carried by a roller. Each section is then advanced by the knife to a position where it is nipped between the roller carrying the knife and a co-operating segmental roller, the cigarettepaper web W having adhesive areas thereon also being passed between these rollers whereby the sections of tipping-material are applied to the web. The cigarette-paper web is then passed over the surface of a guide plate to a guide roller which is so mounted that by means of adjusting-screws the axis of rotation of the roller can be changed to cause lateral displacement of the web if it is not in accurate transverse register. The Specification as open to inspection under Sect. 91 comprises also a detailed description of the cigarette-rod forming mechanism. The web W with the tobacco thereon is drawn through a semi-cylindrical channel in a plate 91, Fig. 8 (Cancelled), a forming-plate 92 secured to the plate 91 overhanging the channel and folding the margins of the web and webpulling tape 46 at one side thereof. The other margin of the web is upright and contacted by a rotating paste wheel 94. The pasted margin of the web, together with that of the tape, is folded over the other margin of the web by a further overhanging plate, the plate 92 at this position being cut away to allow the tape margin to be spread away from the corresponding margin of the web W. The folded margin of the tape is then spread away, and an ironing- tongue arranged over the cigarette rod and between the upright margins of the tape 46 completes the folding operation. The rod then passes through a heating-device of known form. In a modification, the margin of the web-pulling tape 46 corresponding to the pasted margin of the web W is maintained in a substantially upright position during the formation of the cigarette rod, in order to diminish wear on the tape. This subject-matter does not appear in the Specification as accepted.