device for connecting mutually opposite wandteile a tube by transverse welded joints

摘要

1357594 Seaming non-metallic sheet material SIG SCHWEIZERISCHE INDUSTRIE-GES 7 June 1971 [8 June 1970] 19217/71 Heading B5K [Also in Division B8] Apparatus for transversely sealing a tube 2 containing articles 3 comprises oppositely driven shafts 11, 11SP1/SP carrying cranks 9, 9SP1/SP which support hubs 8, 8SP1/SP carrying opposed welding dies 4, 4SP1/SP which follow circular paths on rotation of the shafts, so as to be brought together in the Fig. 4 position and travel with the tube 2 to a position at which they move apart, the shafts 11, 11SP1/SP being moved apart to permit this continued contact. Cams 24, 24SP1/SP carried by the shafts 11, 11SP1/SP and cams 25, 25SP1/SP carried by stub shafts 14, 14SP1/SP, secured to the cranks 9, 9SP1/SP, are supported by rollers 26, 26SP1/SP, 27, 27SP1/SP and are so profiled (Fig. 5) as to effect movement of the shafts 11, 11SP1/SP and 14, 14SP1/SP towards and away from one another. The hubs 8, 8SP1/SP have legs 31, 31a in slots of which the crank supporting other hub is engaged so as to maintain the dies parallel. To cut the sealed tube, a blade 40 is carried by arms 44 on the hub 8 and a counter blade 48 is carried by arms 46 on the hub 8SP1/SP. In a second embodiment (Fig. 6) only the lower shaft 11SP1/SP is movable. A third embodiment (Figs. 7-9) is identical to that shown in Figs. 5-7 of Specification 1,357,593. The dies are electrically heated and the tube 2 is of plastics or plastics coated paper.