| 摘要 |
<p>1,004,410. Synthetic filaments; drawing frames. G. TONOLO. May 9, 1963, No. 18448/63. Heading B5B. A drawing frame or apparatus for stretching synthetic filaments comprises a group of feed rolls and one or more groups of draw rolls. As shown in Fig. 1, a group of rolls indicated generally by the reference numeral 1 is mounted on the front face of a casing 2 having a front wall 19 (Fig. 2, which is a cross-section taken along the line II-II of Fig. 1) and a rear wall 4 formed with a central circular aperture 5 closed by a convex circular plate 6 provided with a bearing 7, 15, 16 in which is rotatably mounted a shaft 17 on one end 18 of which a pulley 20 is fixedly mounted. Keyed to the shaft 17 is a large-diameter externally toothed gear-wheel 25 engaging four equally spaced gear-wheels, one of which is shown at 14 keyed to a shaft 12 rotatably mounted in a bearing 10, 11 on the rear wall 4 of the casing and a bearing 27, 28 in the front wall 19 of the casing. A large diameter roll is keyed to the portion 29 of the shaft 12 projecting from the casing wall 19. The front end 24 of the shaft 17 is rotatably mounted in the bearing 22, 23 provided in the casing wall 19. An internally toothed gear ring 31 rigidly secured to the gearwheel 25 engages four equally spaced pinions of which one is shown at 37 keyed to the end 36 of a shaft 35 journalled in bearings 33 and 34 carried by the casing wall 19. A small diameter roll 39 is keyed to the outer end 38 of the shaft 35. As shown in Fig. 1, there are four large rolls 30A to 30D disposed symmetrically and radially around the periphery of the gear-wheel 25 and driven thereby and four small rolls 39A to 39D disposed symmetrically and radially around the internally toothed ring 31 and driven thereby but offset by 45 degrees from the large rolls 30A to 30D. The speed ratios of the gear-wheels is devised so that all the rolls run at the same peripheral speeds, a filament F enters the group of rolls 1 by engaging the roll 30A and then passes over and in contact with the inward facing surface of the roll 39A. Thereafter it passes over and in contact with the outward facing surface of the roll 30B and so on in a sinuous path over the remaining rolls. After leaving the roll 39D the filament F passes round a guide roll 43 driven by two gear-wheels 41, 42 and travels the group of feed rolls 1 to an identical group of rolls which are draw rolls and are driven at a peripheral speed which is higher than that of the group 1, e.g. 2 to 10 times the peripheral speed of group 1. There may be a series of two or more groups of feed rolls driven at peripheral speeds increasing throughout the series, so that the drawing of the filaments is effected in two or more stages. The gear-wheels attached to the outer rolls may be driven by individual back gearing in engagement with the internally toothed gear ring instead of by the single large diameter externally toothed gear-wheel 25.</p> |
