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    • 1. 发明专利
      GB779691A An arrangement for maintaining constant the tension of web material during winding and unwinding 未知
    • An arrangement for maintaining constant the tension of web material during winding and unwinding
    • GB779691A
    • 1957-07-24
    • GB2996355
    • 1955-10-20
    • DAVID ROTHSCHILD
    • FAZIS HERMANN
    • B65H23/06
    • 779,691. Winding and unwinding webs. ROTHSCHILD, D. Oct. 20, 1955, No. 29963/55. Class 100(1) An arrangement, for maintaining constant the tension of a web as it is being wound on to or unwound from a beam wherein the beam rests at one end on a support, has means for transforming at least a fraction of the thrust exerted by the weight of the beam on the support into an operative force acting on adustment means for adjusting the tension to maintain it substantially constant as the weight of the beam alters, control means being provided to permit variation if desired, of the magnitude of the fraction of the thrust so transformed. As shown, a beam 5 on which material may be wound or unwound from is carried by a U-shaped supporting member 4 on the end of a stub shaft 3 which rocks about the centre 7 of a self-aligning ball bearing 2. A handwheel 28 which can rock about an axis 29 into a vertical position retains the beam 5 in the recess 4a formed by the U-shaped cross-section of the member 4. The handwheel is moved to locking position manually or when the shaft 3 is rotated by an abutment lb. When it is required to remove the beam 5 the handwheel can be rocked into engagement with a bevelled face 1a when the beam is uppermost in the recess 4a. The shaft 3 extends through a carrier 9 within a casing 1, the carrier 9 having a curved surface engaged by a roller 11. The roller 11 is mounted in a fork 31 secured to an adjusting lever 12, the fork 31 being mounted on aligned pivots 35 fixed in the casing 1. The axis 13 of the pivots 35 crosses the axis of the shaft 3 which is journalled within the casing 9 by bearings 8 and 8a positioned on either side of a thrust bearing 19. The lever 12 may be locked in various positions about the pivots 35 by a spring pressed pin 15 which can engage notches 14 in the casing 1. The carrier 9 is urged upwardly by a spring 40 into engagement with the roller 11. As winding proceeds, the weight of the beam increases thus increasing the components V and H of a force P exerted by the carrier 9 on the roller 11. The vertical component V balances the part of the weight acting on the support 4, while the horizontal component H is transmitted through a screw 16 to a member 17 and through the bearings 9 and 8 to a member 21. The member 21 forces a slidable but non-rotatable plate 22 against a friction lining 24, thereby causing a wheel 25 to transmit a higher torque to a clutch plate 22a secured to the shaft 3. The wheel 25 is slidable on the shaft 3 and is driven from a chain wheel 26 by a pin 27. The wheel 25, plate 22a, wheel 26 and a plate 43 carry friction linings 24a, 24b, 24c respectively. In the case of unwinding material from the beam, the wheel 26 is held stationary such that the shaft 3 is braked according to the weight of the material on the beam 5. In both cases the adjustment of the driving or braking torque maintains the material tension substantially constant.
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