Patent GB-465284-A (GB)
Title: Improvements relating to the supply of material in wrapping or other machines
IPC: B65B41/12
Filed: 1935-11-20
Abstract: 465,284. Feeding webs. CRIGHTON, J., and INDUSTRIAL MACHINERY CO., Ltd. Nov. 20, 1935, No. 32186. [Class 100 (i)] In a web-feeding apparatus, particularly for cigarette-wrapping machines, means, set in operation both upon breakage and upon exhaustion of the running web, are provided to deliver automatically a spare web to the web feeding means. The apparatus comprises main feed rollers 16, 17 which feed the web to cutters 31, 32, and auxiliary rollers 40, 41, which are normally raised clear of the rollers 16, 17 but which are adapted, upon the breakage or exhaustion of the running web, to be lowered into contact with the rollers 16, 17 to feed the spare web into the bight of these rollers. The two webs pass between pairs of detector rollers 44, 45 and the end of the spare web lies freely between one of the rollers 40, 41 and its cooperating roller 16 or 17. The feed rollers 16, 17 are driven by gearing from a Geneva gear comprising a slotted disc 23 and a disc 24 carrying a driving roller 25. The edge of the disc 24 is formed as a cam 30 to release a locking roller 28 which, by engaging the slots in the disc 23, holds the gear during the non-feeding periods of the rollers 16, 17. A second cam 34 on the shaft of the disc 24 actuates, through an arm 36, the reciprocating knife 31. The auxiliary rollers 40, 41 are mounted in a frame 42 pivoted centrally to levers 43 pivoted to the machine frame, and are normally held raised from the rollers 16, 17 by the engagement with a roller 51, Figs. 1, 3, and 4, on one of the levers 43 of a bracket 52, on a vertical control bar 53 normally held raised by the armature 57 of a solenoid 55 engaging a second bracket 58 on the bar. The lower end of the bar 53 carries a roller 164 engaging a pivoted arm 63 actuated by a cam 60 so that the bar 53 is raised slightly for a period during each cycle of operation of the machine to relieve the solenoid armature 57 from the frictional grip of the bracket 58. The detector rollers 44, 45 are in circuit with the solenoid 55 and with a timing contact which is provided to delay the complete closing of the circuit until the end of the feed movement of the rollers 16, 17. When the circuit is completed by the absence of the web between a pair of detector rollers, the armature 58 is withdrawn, allowing the bar 53 to fall and causing the rollers 40, 41 to be moved by a spring 43<a> into contact with the rollers 16, 17 to feed the spare web. The inner rollers 45 of the detector rollers are mounted on levers 46 connected by a spring 47 tending to hold the rollers in contact with the outer rollers 44, and also connected by toggle levers 48 to a slidable block 49 carrying a pawl 50 in the path of a bracket 76 on the bar 53. When the bar 53 is raised by the cam 60 after the initiation of the feeding of the spare web, the pawl is engaged by the bracket 76 to lift the block 49 thereby separating the rollers 44, 45 and breaking the circuit to the solenoid 55. The pawl is then moved clear of the bracket 76 to allow the spring 47 to move the rollers 44, 45 into contact again, by means of a spring pin 78 which is depressed manually to engage and turn the pawl. The short length of old or broken web remaining after the last full length has been severed is deflected laterally by means of a plate 64 carried by a pivoted support 65 and normally held in an inoperative position by a spring 68. When the bar 53 descends, a rod 67 carried thereby engages an arm 66 on the support 6 and turns the plate 64 into the deflecting position where it is held by a catch 70 engaging the upper side of the arm 66. A cam 75 moving with the cam 60 actuates a lever 73 to lift a bar 71 thereby turning the catch 70 which first turns the support 55 to eject the piece of web and then releases it to allow it to return to its normal position.