Patent GB-954481-A (GB)
Title: Improvements in or relating to apparatus for feeding stubs
IPC: A24C5/32
Filed: 1959-04-02
Abstract: 954,481. Feeding cigarette mouthpieces. D. W MOLINS, T. ROWLANDS, J. A. RAKOWICZ, and MOLINS MACHINE CO. Ltd. April 1, 1960 [April 2, 1959], Nos. 11254/59 and 4585/60. Heading A2C. Stub feeding apparatus for feeding stubs to a work station on an automatic machine having driving means comprises a stub hopper located remotely from the machine, abstractor means to remove stubs from the hopper and deliver them in end to end relation to be fed to the work station, driving means for the abstractor means independent of the driving means for the machine, a guide conduit extending between the abstractor means and the work station and dimensioned internally to receive stubs from the abstractor means and guide them in end to end relation to the work station, air supply means at a location adjacent the abstractor means to supply a flow of air through the conduit which is dimensioned internally to allow air to flow past the stubs to urge them towards the work station, and control means to operate the driving means for the abstractor means to cause the abstractor means to deliver stubs at an average rate equal to the rate of consumption of the automatic machine. The automatic machine may be one for assembling cigarettes and stubs. A stub is defined at any mouthpiece for a cigarette which is different from the tobacco contained in the rest of the cigarette. In one embodiment, Figs. 1 and 2 (Provisional Specification 11254/59), stubs are removed from a hopper 12 by an abstractor means 13 which consists of a rotatable fluted drum 14 and an endless chain 19. Two rotating cutters 17 which project into grooves 18 in the drum sever sextuple length stubs into three double length stubs and fingers 21 on the chain are arranged to pass through the lowermost flute of the drum and remove the stubs therein. The chain 19 is arranged at such an angle to the lowermost flute that the drum can continue rotating as the finger 21 passes through. The stubs are urged by the finger 21 through an open topped channel 22 past a non-return flap 22a into a breech 23 in which they are a sliding fit. The breech leads to the guide conduit 16 formed as a length of transparent flexible polythene tubing having an inside diameter greater than the diameter of the stub but less than the length of the stub, so that the stubs are arranged end to end. At the junction of the guide conduit and the breech is arranged a muff 24 which is supplied with compressed air through a pipe 25. This forces the stubs through the guide conduit to the work station 11 where the stubs 26 are fed into alternate gaps in a line of separate cigarette lengths 27 by the diametrically spaced pushers 31 of a rotatable disc 29. The guide conduit terminates at the entry to a straight channel 34 and an incline 35 is provided between this and a curved channel 32 through which the stubs are urged by pushers 31. A light spring 36 is provided to control the stubs emerging and a stronger one 37 is provided just after the incline to turn the stubs into the horizontal position again. The rear face of the stubs is thus brought into the path of the pusher 31. Two photocells 38, 39 each with an associated light source 40, 41 are provided to detect two predetermined quantities of stubs in the guide means. It is arranged that the stubs are fed into the tube 16 at a greater rate than consumption at the work station, thus the stubs build up in the tube 16 until the rear stub obliterates the passage of light from the light source 41 to photocell 39 when a control means stops rotation of the drum 14 and chain 19. When sufficient stubs have been consumed at the work station to bring the last stub past the photocell 38, the control means starts the feeding mechanism again. If the hopper becomes empty the non-return flap 22a falls behind the last stub preventing it being blown back by the compressed air. A single hopper may be arranged above a number of fluted drums 14 each feeding an apparatus as described. In a further modification, a single feeding means feeds a plurality of guide conduits each connected to a work station. A selector means is controlled by two photocells associated with each guide conduit. When one guide conduit is filled with stubs past photocell 39 the selector means is moved so as to feed another guide conduit. If all the guide conduits are full up to or past photocell 38, the control means stops the feeding mechanism. In another embodiment. Fig. 1 (Provisional Specification 4585/60) a different muff arrangement is shown wherein the compressed air flowing past the end of a tube 121 draws out the first stub and forces it along the guide conduit 116. The guide conduit has an internal cross section of either a cross, a square, a triangle, as a three or four leaf clover, so that there are at least three guide surfaces for the stubs and the compressed air can flow past the stubs but still carry them along. The guide conduit ends in a nozzle 104, Fig. 5, of smaller cross-section than the guide conduit so that the foremost stub will be accelerated into the first vacant channel 107 in the rotor 105 and will then be carried round and transferred to the first vacant flute, in between the cigarette lengths C, in the drum 102. A stripper 108 is provided to ensure that the stub is not carried past the flute.