| 摘要 |
An arrangement for driving and braking a rotatable turbine shaft of an open-end spinning assembly. The braking and driving mechanisms are interconnected with one another such that the reaction forces on the braking mechanism during braking operations operates to move the driving mechanism into disengagement. In several embodiments, the driving mechanism is mounted on a swivel arm which is pivotally attached to a brake arm containing the brake lining, with the pivot axis of the swivel arm, the spacing of the brake lining and the driving mechanism from one another and from the pivot axis of the swivel arm, along with the pivotal axis of the connection between the brake arm and swivel arm being such as to assure a transfer of brake reaction forces to disengage the driving mechanism. In another embodiment, the driving mechanism is mounted on a swivel arm and a tapered brake lining is slidably mounted in the swivel arm such that engagement of the brake lining with the turbine shaft causes a reaction force to pivot the swivel arm and associated driving mechanism out of driving engagement with the turbine shaft. The arrangement can be used on spinning turbines with either friction wheel or tangential belt drives, with the swivel arm being attached to either the friction wheel or to a roller for pressing the tangential belt into driving engagement. Also, a separate brake for the friction wheel or belt roller is provided for slowing down the driving mechanism once it becomes disengaged from the shaft or belt.
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