Patent GB-500145-A (GB)
Title: Improvements in and relating to web feeding mechanism for machines for wrapping articles such as groups of cigarettes
IPC: B65B19/02
Filed: 1938-02-11
Abstract: 500,145. Feeding webs ; making and filling packets. AMERICAN MACHINE & FOUNDRY CO. Feb. 11, 1938, No. 4320. Convention date, March 25, 1937. [Class 100 (i)] [Also in Croup XVII] A web of wrapping material, e.g. a printed web comprising metal foil with a paper backing, is fed to a wrapping machine by an intermittently rotated drum and a co-operating roller, the drum being provided with spaced pins engaging perforations in the web to prevent slippage thereof. The drum is driven by a planet gear comprising a constantly rotating sun-wheel coaxial with the drum, a coaxial sun-wheel fixed to the drum and a pair of planet wheels secured together and engaging respectively with the sun-wheels, the planet gears being oscillated alternately in the same direction as and oppositely to the direction of movement of the driven sun-wheel. As shown, the web T, Fig. 1, passes from the roll 10 round a guide roller 11 loose on a shaft 31, a looping roller 12. and a feed roller 13 co-operating with a drum 14 provided with pins 42 engaging perforations in the web. The drum 14 to which is secured a sun-wheel 22, is loose on a continuously driven shaft 15 to which is fixed a sun-wheel 21. The wheels 21, 22 gear respectively with two connected planet wheels 17, 18 mounted on an arm 20 which is oscillated about the shaft 15 by the arm of an eccentric sheave 39 actuated by an eccentric 38 on the shaft 31 which is continuously driven from the wrapping machine. The looping roller 12 is carried by a member 33 which is pivoted about the shaft 31 and actuated by a link 35 from the arm 20 so as to take up the surplus web during the non-feeding movement of the arm. The webfeeding apparatus is described in association with a machine for wrapping articles such as groups of cigarettes or cigars and of the general construction described in Specification 354,222, [Group XVII]. This machine comprises a turret intermittently rotated about a shaft 59, Fig. 4, and carrying a series of hollow mandrels 60 about which the sheets cut from the web are folded to form containers for the cigarettes &c. At station XII the web is clamped against the front of mandrel 60 and severed by a knife 51, Fig. 1. As the mandrel is advanced to station I, stationary folding members fold the edges of the sheet against the sides of the mandrel, and at this station plates 61, 62 fold the projecting edges of the sheet in overlapping relation on to the rear of the mandrel and a bifurcated clamp 63 is operated to hold the folds. At station II the folds of the sheet are sealed by a heated plate 69 which fuses a coating of, thermoplastic material previously applied to the web. The plate 69 is carried by a support 66 pivoted to the fixed frame 68 and moved into operative position by a spring 71. The plate is moved into an inoperative position during the rotation of the turret by a rod 80 connected to an arm 76 on the support 66. At the same station the projecting end portions at one end of the mandrel are tucked and folded by plates 64, 65 and as the mandrel moves to station III, the remaining flap is folded over by a stationary folding bar or roller 81. At station III, a second heated plate 69 may again seal the side folds. Between stations II and VI, the end fold passes close to a heated plate 56 to seal the end folds, the sealing being completed at station VI by a rubber pressure pad 87. From station VI the end folds pass in contact with a cooling plate 88 and at station IX, the former receives a group of cigarettes. At station XII a plunger engages the ends of the cigarettes and ejects them with the wrapper on to a table 91. The open end of the wrapper is then partly closed by side tuckers and folder 89, 90, Fig. 5, and, as the package moves along the table, the closure is completed by a stationary folder 90a, the fold is sealed by being pressed against a heated plate 92 and is finally cooled by engaging a plate 96. The perforations in the web are at the sides thereof so that they fall within the folded ends of the wrapper and are concealed from view. Instead of complete perforations, slits may be formed in the web to provide tongues which close after the web leaves the pins 42 on the feed drum.