Patent GB-459377-A (GB)
Title: Improvements in and relating to bag and like tubing machines
IPC: B31B39/00
Filed: 1935-08-14
Abstract: 459,377. Paper tubes. PAPER SACKS, Ltd., and ROBINSON, F. G., 1, Redcliffe Street, Bristol. Aug. 14, 1935, No. 22876. [Class 99 (ii)] [See also Groups XVII and VIII] Perforating means for acting transversely on paper webs in the manufacture of paper bag tubes, comprises a rectilinear dead knife and a rotary knife co-operating therewith, one or other having a series of spaced, oblique cutting edges traversed by the other knife. Webs 2 .. 5 from reels (not shown) guided by resiliently mounted rolls 1, are fed in staggered disposition by draw and guide roll pairs 6, 7, each guide roll 6, preferably rubber covered, being carried on a pair of arms 34, mounted on eccentrics 35 ; spring-biassed mechanism 40 ... 46 permitting of the adjustment of the arc of contact of each web around the feed roll 7 and allowing " give " in the driving pair. For the threading through of the webs, each guide roll 6 is connected to a master control 48 ..... 53 by which the rolls 6 may be lifted from the rolls 7. The speed of each feed roll 7 may be separately adjusted from the drive 21, 22 by cone pulleys 23, the ends of rolls 7 being correspondingly coned to take the driving belts 28. Guide rolls 54, 55, 56 now lead the webs vertically between dead knives 57 and rotary knives 58, whereby each web is perforated transversely, the perforated webs being assembled over an adjustable roll 101 and glued on their edges by nozzles 109. The dead knives 57 are each adjustably mounted on the frame 75 of the machine with their obliquely serrated edges 73 lying in a vertical plane, a resilient insert 76 being disposed beneath each blade. The rotary cutters 58 carry blades 81, adjustably secured in position, the edges thereof being notched at 82, the width of the notches determining the width of paper uncut. Alternatively the oblique serrations may be formed on the rotary knives and the notches on the dead knives. The notched rotary blades 81 may be spaced apart, obliquely disposed knives being interposed therebetween, when shouldered blanks, as described in Specification 443,950, [Group XVII], are required. The pasting device comprises nozzles 109, separately governed by needle valves, supplied by a pump 118, the nozzles being adjustable separately to lie near to the respective paper margins. Draw rolls 10 now lead the perforated and glued webs to a tube former on which a roll 121 takes the place of the usual heel. The side edges of the webs are positively advanced into correct overlapping relationship by interengaging adjustable conical rolls 124, 125 and driven convex rolls 132, 133, positioned respectively below and above the paper margins. Rolls 151, 155 now grip the formed tube and slightly retard it whilst rolls 152, 157 moving at higher speed apply tension to break off the leading tubular blank and feed forward for further operation. The former may be adapted to make gusseted tubes and in this case further driving means for the paper tube may be positioned in the gussets themselves. Specifications 343,447 and 443,920, [both in Group XVII], also are referred to.