Patent GB-666784-A (GB)
Title: Improvements in or relating to apparatus for filling valve bags and control means therefor
IPC: B65B1/32
Filed: 1949-02-25
Abstract: 666,784. Filling valve-bags. ST. REGIS PAPER CO. Feb. 25, 1949. [March 6, 1948] No. 5199/49. Class 94(i). [Also in Groups XVIII and XXIV] Apparatus for filling valve-bags comprises a frame structure carrying a plurality of angularly-spaced filling-nozzles to which :he bags may be applied, power mechanism means for rotating the frame structure intermittently to move a bag from a station at which it is applied to a nozzle to a station at which the nozzle registers with the discharge port of a feeding device and thence to a bag-discharge station, means for weighing successive charges of material and delivering them to the feeding device and control means including a timing device operatively connected to said charge-weighing and delivering means for actuating said power mechanism to rotate said frame structure one step a predetermined time after the delivery of a charge to said feeding device. As shown, the frame structure 20 carries four pairs of filling nozzles 26, 27, 28 and 29 (not shown) four pairs of tiltable bag-supporting chairs 34, 35, 36 and 37 (not shown) and four pairs of bag clamps (not shown) and is rotatable about a vertical axis relative to two belt-type centrifugal feeding devices 30 having discharge ports 33. Each feeding device is similar to that described in U.S.A. Specification 1,979,483 and comprises a grooved pulley 31 in engagement with a belt 32 driven by a motor 46. Successive charges of material for filling the bags are weighed in scale hoppers 42, 42a, and delivered to hoppers 52, 53 situated above the inlets of the feeding devices. The weighing of two charges and the movement of a pair of filling tubes, such as 27, into registry with the discharge ports 33 is arranged to close switches 49, 50 and 51 in the circuit of a relay 55 actuating a solenoid 54 which operates through lever mechanism 58 to discharge the contents of the hoppers 42 and 42a into the hoppers 52, 53. The operation of the mechanism 58 closes a switch 61 in the circuit of a timing device 44 which operates after 8 seconds to close momentarily a switch 65 controlling the engagement of a one revolution clutch 43, (see Group XXIV), through which the frame 20 is rotated by a motor 45. The nozzles 27 are thus maintained in alignment with the discharge port 33 fcr a time interval sufficient to ensure complete filling of the bags, after which the frame is rotated 90 degrees to bring the nozzles 28 into registry with the discharge ports and the operation is repeated When the nozzles 27 reach the discharge station, the bag clamps are opened and the chairs 35 tilted outwardly by cam mechanism to disengage the bags from the nozzles. Each pairs of chairs is associated with jigging mechanism which is operated during the filling operation by an eccentric cam 38 driven by the motor 46. The clutch 43 rotates the frame 20 by means of a crank and linkage so arranged that the frame is set in motion and brought to rest slowlv and undesirable vibration is avoided. Mechanism is also provided for eliminating backlash between the frame and its drive gear and for positively locating the frame while it is stationary. The number of pairs of nozzles on the frame may be increased to eight, the frame being then rotated through 45 degrees after each operation, or the number of feeding devices and nozzles in a group may be increased to three or four, to increase the output of the machine.