| 摘要 |
1,162,030. Belt tensioning devices. PALITEX PROJECT-Co. G.m.b.H. 30 Nov., 1966 [2 Dec., 1965], No. 53605/66. Heading F2Q. A pulley 7 is carried on a slide 3 and is moved automatically in a direction to tension a belt 35 in accordance with the magnitude of the torque transmitted by means comprising a pulley 4 coupled to the pulley 7 by a cylinder 15 and piston 16. The cylinder 15 is pivotally mounted on pulley 4 and a piston rod 17 has a spherical end 18 which engages a recess 19 in the periphery of pulley 7. On clockwise rotation of pulley 4 by a belt 5, fluid is expelled from cylinder 15 and passes through a pipe 26 to a cylinder 28 attached to slide 3 and containing a piston 30 secured to the machine frame. This results in movement of the frame 3 and consequent tensioning of belt 35. In a modification shown in Fig. 3, slide 2 is adjustably fixed by a supporting member 36, and cylinder 28 is also fixed and houses a piston 30 which is connected to a toggle lever system supporting guide pulleys 44. In addition, belt tensioning rollers 45, Fig. 4, may co-operate with guide rollers 46, which may also form the whorls of spinning or twisting spindles. The rollers 45 are mounted on levers 48 which are pivoted at ends 47 and are hinged to piston rods 50 of pistons 51 in cylinders 52 connected to pipe 26. In another modification, a disc 59 is connected to a driven shaft 55 of a motor 56 by a spring 57 and carries a cylinder 15 which is connected to a belt drive pulley 7 rotatably mounted on a boss 58 of the disc 59. Double-acting piston and cylinder arrangements are also described. |
