Patent GB-658727-A (GB)
Title: Machine for forming package wrappers provided with a tearing strip
IPC: B31B1/90
Filed: 1949-07-06
Abstract: 658,727. Wrapping-machines. PACKAGE MACHINERY CO. July 6, 1949, No. 17838. Convention date, July 22, 1948. [Class 94(i)] [Also in Groups VIII and XVI] A machine, for forming a wrapper provided with a tearing strip, having means for supplying and advancing webs of wrapper material and tearing strip material is provided with cutting members positioned in the path of travel of the wrapper web, means for moving said members toward and through the wrapper web to form parallel cuts therein extending in the direction of web travel, means engaging and guiding a portion of the tearing strip web in predetermined relation between the cutting members as the latter advance toward and through the wrapper web, said last-named means advancing simultaneously with the cutting members to disrupt the wrapper web between the cuts as the latter are formed and to project the engaged portion of the tearing strip web in loop formation through the so-formed opening in the wrapper web. A web w of wrapping material is fed from a roll R on a reel 6 over a roller 13 carried by a pivoted arm 14, pull on which by the web controls brake means for the reel 6, and around a guide roll 17 to a stitching drum 18. Narow tape t of tearing strip material from a spool 19 passes through a guide and tensioning device 22, around a flanged guide roll 23, over a guide roll 40 carried by the free end of a spring arm 41 and around a flanged guide roll 43. This roll 43 is carried by an arm 44 pivoted at 45 and normally co-operating with an adhesive applying disc 50 but being periodically moved away from it by the action of a cam 7 engaging a cam roll 46 on the other end of the pivoted arm 44 so that, with the spring arm 41 taking up slack in the tape, spaced adhesive-free parts of the tape are provided. From the guide roll 43 the tape passes along and under a heated member 55 and over a pin 58 to the stitching drum 18. The stitching drum 18, rotating on a driven shaft 82, is formed with spaced peripheral openings 84, Fig. 6, and co-operates with a rotated needle-carrying drum 60 having peripheral recesses 61 in each of which is mounted a needle 62 carried on a pivoted lever 64, 66 having at the other end a cam roll 67 engaging in a cam groove 68 of a stationary face cam so as to tilt the needle slightly as it engages the tape and wrapper web. Each needle 62, Fig. 10, has an open eye 109 flanked by blades 110 having points 111 and cutting edges 112 and as the drum 60 rotates the tape t is engaged by the eye 109 of the needle and carried towards the wrapper web w while the points 111 pierce the web and the cutting edges 112 form parallel cuts c, Fig. 14, the wrapper web between the cuts being broken by the engagement of shoulders 113, at the sides of the needle eye 109, therewith and the tape carried through the web in the form of a loop 1, which comprises that portion of the tape which is free from adhesive. A feed roller 86 co-operates with the drum 18 and it and the drum 60 may be moved from the drum 18 by the actuation of hand-operated cams engaging pivoted levers in which the roller 86 and the drum 60 are journalled. From the drum 18 the composite web passes down over a suitably shaped guide plate 114 and through a further guide 118 to co-operating feed rolls 122, 123 the roll 123 being spring-urged towards the roll 122 and being capable of being swung out of contact therewith. The web is then cut by a fixed blade 137 and a co-operating rotary blade 138, and is carried by an advancing article x to be wrapped into a wrapping machine 1. The rotary blade 138 is driven at non-uniform speed by elliptic gearing so as to permit the tape loop l to pass the blade and then, as the blade moves with increased speed, be cut between its ends, Fig. 16. The rotary cutting blade 138 and the drum 18 are driven from the same source and by adjusting the relative rotary position of the drum 18 to the gear to which it is secured so the position of the loop l relative to the rotary blade 138 may be altered.