Patent GB-133680-A (GB)
IPC: B31C1/00
Filed: 1919-10-02
Abstract: 133,680. Malm, A. C. V. Oct. 7, 1918, [Convention date]. Feeding webs; collapsible spindles and rollers.-A machine for forming tubular containers from a web of paper or other material comprises a number of constantly rotating mandrels carried by a revolving carrier and acting successively to form tubes which are delivered automatically. The mandrels are fitted with grippers and are automatically fed by a conveyer with sheets which are cut from a web, and are pasted with cement on the upper side for securing together the several plies of the tube, the rear portion however being free from cement so that the outer layers of the tubes are not coated. As shown, a web of paper 1 is fed from a roll 5, the spindle of which is mounted in bearings fitted with a clamp 6 for tensioning the web, and the web is fed by rollers 7, 8 , 9, to a cutting-device comprising a knife 14 mounted on an inclined support 15 and coacting with a knife 16 on a rotating drum 17. The coated sheet is carried by a conveyer 35, and the sheets are fed to successive collapsible mandrels 37, four of which are shown mounted between side frames 41, 42, and about a central shaft 40 which is driven by chain and toothed gearing from a motor 18 which also drives the feeding and cutting mechanism above described. The shafts 38 of the collapsible mandrels are carried at one end by radial arms 39 on the shaft 40, and they are driven by toothed wheels 50 which move around a central fixed wheel 51. The cut sheets are taken by grippers 44, Fig. 4, actuated by fixed pins acting on arms 47, 48, Fig. 6, on the shaft 46 of the grippers, the grippers being closed to hold the sheets, but released after one complete layer has been wound around the mandrel. A common spring retains each gripper in either the open or the closed position. The paper is pressed on the rotating mandrels by small positively driven rollers 52 arranged near the shaft 40 in a collar 70 carried bv a fixed sleeve 71. The finished tubes are removed from the mandrels through a gap in the side frame 42 by means of an ejector in the form of a quickly-driven band 65 driven by chain gearing and mounted so as to move the finished tube axially at a time when the mandrel 37 is collapsed. The mandrels are constructed, as shown in Figs. 4 and 6, of 3 segments which are carried by spiders 49 at each end, and those at the end of the frame 42 being of smaller diameter than the expanded mandrel so as to allow of removal of the finished tubes. The segments are carried by pins 54 on blocks 75 which are guided by pins 76 to move radially of the spiders 49, and are acted on by springs 77 which tend to collapse the mandrel. Normally the mandrel is maintained in its expanded position by tapered portions 57, 58, on a sleeve 56, which can slide on the shaft 38 of each mandrel, and to collapse the mandrel the sleeve 56 is moved to the left in Fig. 4 by a fixed cam 60 which engages a grooved collar 59 on each sleeve 56. The ends of the mandrel shafts 38 are fitted with rollers 63 which are supported in grooves in the frame 42 except at the portion of the frame which is cut away to permit of ejection of the finished tubes.