| 摘要 |
1,060,290. Tube-making machines. G. PASQUETTI. Jan. 12, 1966 [Jan. 25, 1965], No. 1440/66. Heading F2P. A machine for making flexible tubing from an extruded, profiled strip 1 of plastics material formed with a longitudinal channel adapted to receive a longitudinal bead on 5 the strip, comprises a drum 12 provided on the circumference thereof with two substantially helical passages 15, 16, Fig. 6 (not shown), arranged side by side and adapted to guide two portions of the strip brought close together by helically winding the strip about the drum, the passages being separate at one end and converging at the other end to form a single passage 17, Fig. 9 (not shown), smaller in width throughout the length thereof than twice the width of the profile. Rollers 33 are mounted on driving shafts 31 extending parallel with the axis of the drum and movable with respect to that axis to bring the rollers into adjustable pressure contact with the drum by toothed sectors 48, 49 carried on arms 27, 28, supporting the shafts, and meshing with worm-wheels 46, 47 rotated by handwheels; the shafts 31 are driven by chains 39 connected to an electric motor 42. As the strip is wound on to the drum the channel in the strip is opened to allow the bead of the strip to engage in the channel. |
