GB1009700A - Bag closing and tying machine and method - Google Patents

Abstract

1,009,700. Tying bag necks. FMC CORPORATION. Sept. 25, 1963 [Oct. 5, 1962], No. 37643/63. Heading B8C. [Also in Division B3] After the neck 20a (Fig. 2) of a bag has been gathered against a stop 68, a tie 100 is applied to the neck by movement in the same direction as the bag to overtake it. In the form illustrated the tie 100 is carried by a double-armed lever 70 which also carries notches 68 forming the stop. When a mechanical sensing device indicates that the package 20e has reached the position where the bag neck is fully gathered, the arm 70 is rotated through half a revolution to apply the tie 100 : immediately before this a spring-biased stop 96 is positioned against the gathered bag neck. The package is carried on an endless belt (not shown) and the neck is flattened and fed firstly by guides 54 and subsequently by rollers 50, 52 whose peripheral speed is the same as that of the belt. One of the rollers may be grooved to fit into the other, which may be surfaced with a friction material. The tie is subsequently twisted by jaws 110 (see Division B3) which advance towards the tie, grip it and twist it, release it, and are then retracted and rotated in the opposite direction. Each tie may consist of a wire 194 (Fig. 13) sealed between two strips 196, 198 of paper. The ties are fed from stock 192 (Fig. 2) by rollers 202, 204, to lie across the notch 102 in the lever 70. The tie is then cut from the stock by a guillotine 244 and immediately afterwards is pressed into the notch 102 by a shaping finger 262. The devices for feeding the tie stock, and for applying and twisting it, together with the equipment for gathering the bag neck, may be formed as a unit separate from the conveyer carrying the filled bags, and the unit may be pivoted to permit its use in conjunction with a laterally inclined conveyer.