Patent GB-1006570-A (GB)
Title: Automatic cigarette paper pressure slicer
IPC: A24C5/20
Filed: 1962-06-13
Abstract: 1,006,570. Feeding webs; splicing webs by crimping. AMERICAN MACHINE & FOUNDRY CO. June 13, 1962 [June 14, 1961], No. 22734/62. Headings B6B and B6P. In a web roll changing device the fresh web is spliced to the expiring web by crimping when the speeds of the expiring and fresh webs are the same. The expiring web 22, Fig. 1, is fed by continuously driven niprollers 32, 34 from the web roll 18. The fresh web 20 is threaded from a new roll 16 under an anvil 28, over a guide rod 36 and between stationary nip rollers 38, 40. A photo-electric device detects when the web roll has nearly expired, and sets in motion the splicing operation. First a clutch 44 is engaged so that the nip rollers 38, 40 are driven via a belt 48 from the drive of nip rollers 32, 34. The new web is therefore accelerated until the speeds of the new web and expiring web are approximately equal. Two splicing segments 62 and 64 attached to shafts 70 and 72 respectively are then rotated by a single revolution clutch to splice the webs by crimping. A pair of knives 102 and 104, Fig. 2, are provided to sever the expiring web after the splice by co-operating respectively with the anvil 28 according to which side of the anvil the expiring web is passing. As shown in Fig. 2, the knives are mounted on levers 94 and 96 pivoted respectively at 98 and 100. A spring 110 biases the levers into engagement with cams 106 and 108 attached to the shafts 70 and 72 respectively. A manual selector 112 is provided for preventing one of levers from moving inwards when its respective cam is rotated, so that only the lever carrying the knife for severing the expiring web is allowed to co-operate with the anvil 28. The leading part of the new web 20 fed prior to the splice is severed by a knife 84, Fig. 3, co-operating with a notched portion 92 of the segment 64. Knives 84 and 86 are mounted on levers 80 and 82 respectively, and biased towards the segments 62 and 64 by springs 88. As the splice continues, Fig. 6, the levers 80 and 82 are driven backwards clear of the web by the segments 62 and 64 striking against the blades 84 and 86. If the new web 22a comes from the web roll 18, as shown in broken lines Fig. 1, it is threaded over guide rod 122, around idler roller 124 and back to a pair of nip rollers 128, 130. These nip rollers are driven via belts and idler pulley 50 from nip rollers 38, 40. The crimped splice performed on the webs is shown in Fig. 8. The photo-electric sensing device detects when a web roll has nearly expired and closes either switch 132 or 134, Fig. 7, according to which roll is expiring. When switch 132 closes, holding circuit 136 closes provided switch 46 is closed to the A side. Switch 46 is a manual selector switch which the operator sets when he places a new roll of paper on the roll mounts. When circuit 136 closes, capacitor 169 discharges for a time sufficient to cause circuit 152 to close and allow a repeat cycle timer to start. The timer motor M begins to rotate and immediately cam-operated switches 154 and 157 close. Switch 154 holds the circuit of the timer motor for the duration of the splice, and switch 157 energizes the clutch 44 to commence the acceleration of the new web. Camoperated switches 155 and 156, in series, are closed after a time delay, during which the new web is brought up to the speed of the expiring web; and a solenoid 56 is energized to release the one revolution clutch which drives shafts 70 and 72 carrying the segments 62 and 64 and cams 106 and 108. A holding circuit 148 is also closed to energize a fifteen second thermal delay relay which causes a warning buzzer 140 to become operative. The web is being fed into a cigarette making machine, and the buzzer tells the operator that defective cigarettes are to be removed which have been manufactured with the spliced part of the web.