Patent GB-1014949-A (GB)
IPC: B65H21/02
Abstract: 1,014,949. Wrapping machines. G.D. SOC. IN ACCOMANDITA SEMPLICE DI ENZO SERAGNOLI E ARISTO SERAGNOLI. Dec. 30, 1963 [Dec. 29, 1962], No. 51248/63. Heading B8C. [Also in Division B6] Feeding webs.-In a web feeding device for feeding a web of weldable wrapping material into a packaging machine, a web splicing arrangement, Fig. 1, is provided with a detector roller 23 detecting the diameter of a running web roll 28 which operates a switch 27 to sound a warning device (not illustrated) when the web roll is nearly exhausted. A replacement web 31 is held in readiness to be spliced on the anvil body 35 of a heated welding device 37, Fig. 2, pivotally mounted at 38 and provided with a handle 39. A pawl 44<SP>1</SP> cooperates with a guiding roller 43<SP>1</SP> to hold the replacement web 31 in place on the body 35. When the warning device is sounded, the operator stops the packaging machine and feed rollers 34 and lowers the welding device 37 to splice the webs. The remainder of the web 30 is severed automatically with a guillotine or manually with scissors. Upon operation of the welding device 37, a switch 42, Fig. 2, is actuated to commence operation of a delay mechanism which results in the discarding of a package which is wrapped with the spliced part of the web. Discarding a faulty package.-Fig. 3 illustrates a part of the machine after packages have been wrapped which comprises a disc 46 which is intermittently rotated in the direction of the arrow 48. Cavities 47 around the disc make successive stops at a supply station A where wrapped packages are introduced, a discarding station B, an auxiliary supply station C and at successive stations to the outlet station D. Fig. 5 is a cross-section on the lines 13-13 of the discarding station B and comprises two tongue portions 51, 51<SP>1</SP> which support the packages 45 in the cavity 47, and which may be retracted by electromagnets 53, 53<SP>1</SP> so that the packages are discarded by the force of gravity. The packages 45 are supported at other times in the cavities 47 by arcuate plates 49 and 49<SP>1</SP>. When packages are discarded at B, the cavity 47 is replenished with wrapped packages from a magazine at station C. Part of the delay mechanism for the machine comprises an intermittently rotated disc 56, Fig. 6, driven by the machine which has a plurality of pins 59 in holes spaced around near to the periphery of the disc. A rubber ring 60 encircling the disc, presses against the pins to hold them in their holes by friction. When the switch 42, Fig. 2, is closed upon splicing the web, a transformer 72, Fig. 8, supplies a current to energize an electromagnet 61, Figs. 6 and 8. Energization. of 61 causes an arcuate shaped head 64 to depress at least one, at the most two, pins 59 to the position shown in broken lines. As the disc 56 is rotated, the depressed pin or pins co-operates with a bell-crank lever 65 to actuate a switch 70. Closure of switch 70 energizes the coil 74 of relay 73, Fig. 8, and a switch 75 controlled by a cam 76 driven in synchronism with the machine retains the relay in the closed position. Closure of the relay causes the excitation of electromagnets 53, 53<SP>1</SP> which withdraw the tongues 51, 51<SP>1</SP>, Fig. 5, thereby discarding the packages from the cavity 47 at the discard station B. A ramp 71, Fig. 6, positioned after the bell-crank lever 65, forces the depressed pins 59 up into their original positions.