Patent GB-633907-A (GB)
Title: Improvements in wrapping machinery
IPC: B65B49/14
Filed: 1947-09-04
Abstract: 633,907. Packing tobacco &c. by wrapping up. ROSE, A. G., PEARSON, F. H., and ROSE BROS. (GAINSBOROUGH), Lt d. Sept. 4, 1947, No. 24394. [Class 94(i)] in a machine for wrapping tobacco or like material wherein a wrapper 11 of paper, foil or film is first pressed into a pocket 32 of a pocket wheel 33 so as to form the wrapper into an open channel and then base portions of projecting end portions of the channel are folded inwardly to form an open topped box for the reception of a charge of material, this folding of the base portions is effected by means of a pair of folders 53 rotatably mounted on a pair of folder supports 54 which are disposed one on each side of the nocket wheel and rotated about an axis parallel to the axis of the pocket wheel so as to bring them into such positions that the axes about which the folders are rotated substantially coincide with the respective lines about which the base portions of the channel are folded. Wrappers 11 of foil (with or without paper liners) are fed singly along a channel 12 (Fig. 3) by pushers 13 carried at spaced intervals on a conveyer chain 14, and on to two pairs of movable wrapper supports 16 and 17, which support the wrapper along its longitudinal edges. When the wrapper reaches the position shown in Fig. 5 a pair of nipping members 26 carried by an arm 27 pivoted on a shaft 19, are moved forward by cam means (not shown) and nip the wrapper against the supports 16. Meanwhile a pressing member 34 is also being moved forward by cam means (not shown), the member 34 being carried by an arm 36 nivotally mounted on the shaft 19. A cam 41 carried by the arm 36 moves a cam roller 42 carried by one arm 43 of a two-armed lever 43, 44, for the purpose of moving the wrapper 17 sideways clear of the wrapper 11, the cam roller 42 being held in engagement with cam 41 by a spring. The arm 44 and a similar arm 46 are secured to a shaft 47 and connected through ball-jointed links 49 to arms 51 extending from the supports 17 which are pivotally mounted in bearings 52. The supports 16 are carried on limbs of a forked arm 18 pivoted on the shaft 19 and as soon as the supports 17 have been moved clear of the wrapper to the position shown in dotted lines in Fig. 3, the support 16, nipping members 26 and the pressing member 34 are moved by their respective cams towards an empty pocket 32 of an intermittently rotatable pocket wheel 33. The wrapper 11 is thus pressed into the pocket in the form of an open channel as seen in Fig. 7, and the base portions of the channel are then bent upwardly by folding members 53 which have been moved together with folder supports 54 towards the pocket wheel 33 from the position shown in Fig. 5 to that in Fig. 7. The folders are rotated on their respective supports 54 by means of a pair of arms 59 secured to a shaft 61 and connected at their other ends through ball-jointed links 66 to arms 67 extending from the folders 53. The folder supports 54 form part of a forked arm 55 secured to shaft 19. Further arms (not shown) secured to shafts 19 and 61 carry cam rollers engaging with cams which are so timed that the axes of rotation of the folders 53 coincide with the face edges of the base of the pocket 32. The nipping members 26 are returned to their initial position (Fig. 1, not shown) during the folding action of the folders 53, after which the folders themselves are rotated into inoperative position and simultaneously returned with their supports to their original position. A pair of supporting plates 69 slidably mounted on the pocket wheel (one pair for each pocket) are now moved into position (see Fig. 9) by cam mechanism (not shown) to maintain the folds just produced. The pressing member 34 is now returned to its original position leaving the wrapper in the pocket in the form of an open topped box (Fig. 9), the pocket wheel rotated to carry the box to a tobacco-feeding station and the supports 16 also returned during such rotation. At the feeding station a pair of spring steel blades 74 are passed into the box adjacent the sides 76 formed by the folders 53 so as to guide the tobacco into the box. A charge of tobacco fed from a hopper is pressed from a press chamber 72 into the box by a reciprocating plunger 73 the blades being withdrawn during the last stages of the pressing operation and being flexed against the plunger during this withdrawal. The blades 73 are carried by pivoted arms 77 connected by ball-jointed links 78 to arms 79 secured to a shaft 81, carrying a further arm 82 connected by a link 83 to a lever which is operated by suitable cam means (not shown). Specifications 633,908, 633,909 and 633,910 are referred to.