Patent GB-593866-A (GB)
Title: Improvements in or relating to packing machines
IPC: B65B61/00
Filed: 1945-06-18
Abstract: 593,866. Packing - machines. CHALMERS, J. W., JACKSON, D. R. P., and MOLINS MACHINE CO., Ltd. June 18, 1945, No. 15432. [Class 94 (i)] In a packing machine such as that described in Specification 508,466 the filled packets are received in an intermittently rotated stacker 716 having pockets 718 for receiving the packets and provided with heating appliances for setting the gum, the inner member 716 of the stacker receives the packet as formed to the condition shown in Fig. 11 by means as described in Specification 508,466, and the flaps a<1>, f<1> are folded by rotation of the stacker relatively to fixed rings or plates 719 formed with slots to permit passage of the flaps a<1>, f<1> which are folded over as the stacker rotates against edges 754 of the slots. Alternatively the packets may be completed by gummer's devices 380 and folders 381 as described in the aforesaid Specification and be fed to the stacker for heat treatment and for delivery. As shown in Fig. 3, the packets are fed to the stacker by means of a pair of slides 730 reciprocated by crank-and-link mechanism and fitted with pawls 738, 739 for engaging the side and top walls of a packet as shown in Fig. 7, and registering stops 803, 802, 801, guide the packet into correct position in the packets 718 of the stacker. The stacker is given a series of intermittent motions of an extent equal to the distance between the pockets, and when a packet reaches the position EP, Fig. 1, it is ejected to a delivery shoot 804 by means of a rotatable member 722 driven in synchronism with the stacker and the packing machine, and fitted with pusher members 725 which pass laterally through the pockets and are so mounted as to maintain a flat side in contact with a face of a packet. The ejecting position EP is adjacent to the receiving position RP. The shaft 717 of the stacker is rotated by means of a spring- pressed plunger 745 adapted to engage between studs 741 mounted on a disc 740 on the shaft 717, the plunger being mounted on a rod 742 actuated by a crank-pin 743 which imparts a movement to the plunger consisting of reciprocating radial and arcuate components whereby the plunger engages a pair of studs 741 during one arcuate movement and is disengaged therefrom during the return movement. A pivoted catch 749 operated by a cam 753 holds the disc 740 in position when the plunger moves out of engagement with one pair of studs. To complete the delivery of a batch of packets when the packing machine has completed operations, the delivery mechanism may be driven independently of the packing machine by means of an electric motor 766 which is geared to the means for rotating the stacker and the ejector mechanism. The normal drive to these mechanisms from the packing- machine is a free-wheel drive and so permits of the independent drive by the motor 766, Fig 1. The circuit to the motor 766 comprises two parallel circuits so arranged that when a handswitch is operated to de-energize the motor 766 the de-energization is completed only when the normal drive from the packing-machine is in correct timed relation. The plates 719 are fitted with electric heaters and may be controlled by a thermostat. In the Provisional Specification reference is made to Specification 507,998.