Patent GB-686906-A (GB)
Title: Improvements in the feeding of powder and like fluent materials in equal quantities
Inventor: ROSE ALFRED GERMAN
IPC: B65B1/44
Filed: 1949-05-06
Abstract: 686,906. Weighing-apparatus. ROSE BROS. (GAINSBOROUGH), Ltd. May 2, 1950 [May 6, 1949], No. 12105/49. Class 143 [Also in Groups, XVII, XXX and XXXV] In a filling machine which automatically packs charges of measured volume into cartons, a charge is periodically weighed and any variation in its weight from a predetermined standard automatically effects a change of volume of the measuring means. The filling machine comprises a main supply duct 12 feeding a chamber 13 which communicates with holes 14 in a rotatable: disc 16, the front wall 13a of the chamber, together with scrapers 25, serving to return surplus material from a channel 26, on the disc, to the main duct 12. The volume measuring chambers each consist of a member 17 depending from disc 16, a member 18 depending from a disc 33, and a gate 19 which is pivoted to effect discharge when a roller 46 engages a fixed cam 48, Fig. 2, and is reclosed when a roller 47 engages another fixed cam 49. A driven worm wheel 31 rotates the discs 16, 33, shoots 22, and arms 61 and drives a chain conveyer 24 which carries the cartons into a filling position beneath shoots 22 whereupon the arms 61 are lifted by a fixed cam 63 and raise the cartons into engagement with the ends of the shoots to receive measured charge. The volume of each chamber is adjustable by telescoping members 17, 18, and this is effected by rotation of a screw shaft 41 through a worm drive 134, a shaft 133 and a motor 132. A shaft 88, driven from the same drive as worm wheel 31 rotates cams 98,' 87, 127 and 146 which effect the following sampling and adjusting sequence of operations. With pan 64 .empty and clamps 91 engaging the beam, a cam 144 is extended into the path of a roller 46 so that the next filled chamber to arrive is discharged through its shoot 22 into the weigh pan; cam 144 is then retracted and the normal filling process continues. Clamps 91 now release the beam and, assuming the charge to be over weight, the pan, sinks below a horizontal position. Through an arm 101 (Figs. 4 and 5) and meshing racks 102, 103 an arm 111 is rotated out of its neutral position in alignment with a slot 110 between a pair of sectors 114, by an amount proportional to the excess in weight. Clamps 91 are once again applied. A plate 118 is now moved axially along shaft 108 and pivots both the sectors 114 and the switch carrying arms 115 about pivots 230, 231 until one of the sectors abuts against arm 111 whereafter further movement of plate 118 presses the switch arm associated with that sector into engagement therewith so closing the switch and energizing motor 132 which effects a reduction in size of the chamber 17, 18. Simultaneously rotation of the motor is also transmitted through chain 129 to shaft 108 which rotates the sectors 114 until the arm 111 and slot 110 are aligned, whereupon the arm 115 and sector separate. under the action of springs 119, 116, and the switch de-energizes the motor. A fork 138 next engages an arm 136 and re-centres the sectors, and the pan 64 is automatically discharged into a suction device 152 which returns the material to the main duct 12. The apparatus is now ready to commence another cycle of operations. During the sensing movement of the sectors 114 and switch arms 115. if the arm 111 and slot 110 are in alignment, due to the charge in pan 64 being of the predetermined weight, neither of the switches is actuated and the motor 132 remains deenergized.