GB315939A - Automatic sacking and weighing apparatus - Google Patents

Abstract

315,939. Jarrier, R. May 10, 1928. Packing pulverulent substances into sacks.-A machine for simultaneously sacking and weighing granular or powdered material comprises a truck carrying a sack-holder and adapted to be pushed onto the platform of a weighing-machine, and a filling device that is stopped when a sack on the truck contains a predetermined weight of material. The filling device comprises a feed hopper 1, Fig. 1, from which material is fed along a. tube 2 into a sack 3 by means of a conveyer worm 4 driven by a motor 9. The pitch of the worm 4 increases in the direction of feed to prevent clogging. Operation of a slidable starting handle 50 removes a pivoted strut from beneath the weigh-beam 32. The consequent downward movement of the beam causes a contact 37 on a counter-weighted lever 34 to enter a mercury cup 41 and start the feed motor 9. When the required weight of material has entered the sack, the weigh-beam rises and the motor circuit is broken. In a modification, Fig. 6, the switch lever 34 is replaced by a lever 59 having a pair of connected contacts 66 for insertion into mercury cups 69 in the motor circuit. To start the motor a pivoted counter-weight 61 is rocked by a handle 64 to move the lever 59 into horizontal position. As the weigh-beam rises, it contacts with an extension 65 of the lever 59 causing the weight 61 to rock and thereby effecting a quick break of the motor circuit. The sack is gripped by two pairs of jaws 23, Figs. 1 and 4, formed by members 24, 26 that are supported on vertical rods 25, the member 26 being fixed to the rods while the members 24 are pivoted thereto. The jaws are faced with rubber and are held closed by a pin 27. The rods 24 are adjustably supported within the upper ends of a pair of trestles 22 carried by a platform 17 that is pivotally mounted in bearings 15 disposed to one side of a wheeled truck 12. Depression of a pedal 21 allows the platform 17 to tilt under the weight of the sack so that upon release the sack drops clear of the truck. A counter-weight 18 returns the platform to normal position. The members 26 are slidably connected and one treadle 22 is slidably mounted to allow the distance between the jaws 23 to be adjusted.