| 摘要 |
620,410. Packing. PNEUMATIC SCALE CORPORATION, Ltd. July 12, 1946, No. 20932. Convention date, Oct. 2, 1945. [Class 94(i)] In a machine for producing bags by feeding and guiding a web of material into the form of a U-shaped strip and sealing the strip along the longitudinal open side and at spaced transverse zones to form a bag section open at the top which is filled and sealed by the transverse sealing means, each of a plurality of webs is formed into a U-shaped strip and reciprocating mechanisms seal two zones simultaneously, one zone extending longitudinally and the other transversely, to form open top bags which are filled and advanced one bag length to permit the sealing mechanisms to form other bag sections. As shown, bag forming material, preferably porous and containing a thermoplastic, is withdrawn from two rolls 16, 17 and led past bag forming mechanisms 18, 20 to fold the material into U-shaped tubes which are sealed by members 26 and 28 simultaneously longitudinally and horizontally to form two open top bags which are filled with tea by means of filling mechanisms 36, 37. The filled bags are pulled down one bag section by gripping and advancing members 22, 24 before the sealing members form another pair of bags. The strips of filled bags pass to severing devices to cut the transverse seals to produce individual bags which are then delivered to stacking mechanism, Fig. 18 (not shown). The sealing mechanism, Fig. 11, comprises two pairs of L-shaped members 137, one of each pair of which may be electrically heated, each pair being mounted on a reciprocating slide 140 operating in a bracket 142 attached to the frame of the machine. The reciprocations are produced by a cam 148 driven by a shaft 150, cooperating with a roller 154 against springs 156. The gripping and advancing members are operated in a similar manner. The filling mechanisms comprise funnels having flaps operated by cam action to deliver a predetermined quantity of the commodity and the hoppers. feeding the funnels are provided with pawl and ratchet clutch device which may be disengaged to prevent the feed of the commodity. Specification 600,860 is referred to.
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