Patent GB-1128101-A (GB)
Title: Improvements in or relating to methods of and machines for packaging plastic material
Inventor: REDFERN RONALD
IPC: B65B3/28
Filed: 1966-03-01
Abstract: 1,128,101. Container filling machine. JOHN F. RENSHAW & CO. Ltd. 21 April, 1967 [1 March, 1966], No. 9046/66. Heading B8C. An apparatus for filling containers with plastic substances includes means to receive a charge of the substance and place it into the container, the charge being below the desired contents weight, and means to add further substance to the contents at a later stage to make up the weight. The machine described operates on lined cartons and includes means to open out the linings to receive the charge. Dispenser charging and supplementary feed.- The plastic material is extruded by screws 3 through a nozzle 11 having a closure plate 16 and through a make up nozzle 12 having a constantly reciprocating closure plate which is caused either to close the orifice entirely or else to cut off slices of the product, which fall into the carton until it is again moved to the closure position by the weighing means 124. The main volume of the substance is extruded into one of a pair of dispenser cylinders 21 mounted one above and one below a table 19 with their axes at right angles, the table being rotatable through angles of 180 degrees about an axis A-A. Thus, while the cylinder above the table is aligned with the nozzle 11, that below is aligned with the carton filling support 30. At each rotation the position is reversed. In charging the cylnder, the latter is advanced towards the nozzle by hydraulic or pneumatic means 23 and the plate 16 withdrawn. A piston 26, in its advanced position within the cylinder 21, is forced back as charging proceeds and operates a stop, selected or located for various charge amounts, to stop the feed. The cylinder then withdraws and the table 19 rotates. Carton feed and filling.-Erected cartons 48, with their closure flaps 52 folded back and their liners 51 protruding, are fed in the horizontal position by upper and lower conveyer belts 57, 56, rails 54 and 55 locating the cartons and the former rail being adjustable for various carton lengths. The leading carton 50 abuts a stop plate 58 which is raised by piston and cylinder means 64 to permit it to enter above the filling position, Fig. 4. The stop plate descends, an extension 63 at right angles to it pushing the carton down to rest on a pair of support rails (70), Figs. 6, 7 (not shown), and a plate 94 lying between them and pivoted at 95. A back plate 73 thrusts the carton forward towards a nozzle 115, blast from which opens the liner enabling fingers 114 to enter its mouth. These then move radially outwards to the position shown in Fig. 4 so that the charged cylinder 21 may be advanced within the carton until it reaches the bottom. At the same time, clamp plates (97), Figs. 6, 7, engage the carton sides to prevent bulging during filling. The cylinder 21 then withdraws as the piston 26 advances so that material progressively fills the carton, including the space left by the cylinder walls. Finally, the piston 26 withdraws, a blast of compressed air through an aperture (not shown) in its face preventing adhesion of the charge. The plate 73 now moves back, the gripper plates (97) release the carton and the support rails (70) pivot downwards to leave the carton on the plate 94. Gripper fingers (117), Figs. 6, 7, movable with the plate 73 withdraw the carton and the plate 94 tilts downwards so that the carton engages a guide 122 and falls mouth uppermost in the path of conveyer flights 125 above a track 123 leading beneath the make-up nozzle 12. At this point, part 123A of the track forms a scale pan. The filled cartons leave the machine on a track 123<SP>1</SP> for subsequent closing (not described).