Combined bagging and packing machine and method

摘要

982,394. Packaging - machines. INTERNATIONAL DEVELOPMENT CO. OF NATIONAL DISTILLERS & CHEMICAL CORPORATION S.A. Jan.18, 1961, No. 2110/61. Heading B8C. A machine for enclosing articles in a longitudinally doubled synthetic plastic sheet 8, Fig. 1, formed into an opentopped bag 16, by transverse seals 15, comprises a feed roll 9 and roller 10 for feeding the sheet downwardly, a spreader 18 for spreading the open side of the folded sheet, a heated cutter 79 for sealing and cutting the sheet transversely at 17, a guard means 103 for the cutter and a cutter control 106a to be operated by the guard means. The folded sheet 8 is fed from a supply roll 9 into a spreader sufficiently wide for insertion of an article thereinto and which trips feed control means 25 to operate a piston and cylinder 26 causing, by means of a rack 27 and gear-wheel 29 on the roller 10, to feed a length of bag predetermined by the trip rod 30 and bleeder control 33. The slack in the sheet is taken up by a tensioning means 50 associated with a brake drum 58 mounted on the roll 9 and connected by a cable 64 (not shown). At the end of the feed stroke a valve on the cutter/ piston cylinder 65 is automatically actuated to move a batten 80, mounted on the frame part 671, against the cutter 79 it being timed to cut off and release the fitted bag length and seal the cut off edge of the next bag length. A gearing mechanism duplicated on either side of frame parts 86, 87 and comprising a tubular sleeve 84, rack bars 88, 881 (not shown) interconnected by gear-wheels 91 ensures even and uniform action of the cutter blade. To prevent accidental placing of an object between the cutter and the platen the cutter is provided with a guard 101, 102 mounted on projections 104 and the guard on retracting will operate the bleed valves 106a and reverse the movement of the platen 80 to inoperative position. In normal operation projections 104 are spaced slightly apart and are prevented from engaging the bleed valve by pins 107 mounted on a bar 106. These controls are contacted by said projections only when the cutting and sealing operations are completed to retract the cutter frames. The safety device may be hand operated by either of the bleed valves to return the cutter frames to complete the cutting operation. The machine may be selectively automatically or manually operated by actuating a vent control 100, in the latter case, for venting the feed cylinder-piston unit 26. A timer may be connected with the unit so that it will be operated at a certain time interval when a bag length has been fed through and the machine stopped. The weight of the article is such that it will cause the packaged end of the sheet to be pulled down past the spreader in that cycle in which another bag length is being drawn from the supply roll. The machine may be provided with a table or shelf 4. Reference has been directed by the Comptroller to Specification 855,472.