| 摘要 |
A yarn take-up and supply mechanism for selected intermittent use with textile machines, such as a two-for-one twister, utilizing yarn, such as during a threading-up operation of the machine, characterized by a construction for receiving a free end of yarn from the textile machine, taking-up a loop of a predetermined length of the yarn and completely releasing the free end and taken-up length of yarn to the textile machine in a substantially tension-free condition. The mechanism includes clamping devices for receiving the free end of yarn extending from the textile machine and for clamping the free end of yarn, driven take-up devices for engaging the yarn inwardly of the clamped free end and for moving away a predetermined distance to carry the yarn and form a loop of a predetermined length of the yarn, and devices for releasing the clamping devices and the free end of yarn and for releasing the loop of yarn from the take-up devices for presentation of the free end of yarn and the taken-up length of yarn in a substantially tension-free condition to the textile machine. Preferably, the mechanisms further include yarn injector/ejector pneumatic devices for selectively creating a suction air flow to inject the free end of yarn into the clamping devices and for subsequently selectively creating a positive air flow to eject the free end of yarn from the clamping devices back to the textile machine after the take-up devices have formed a loop of a predetermined length of the yarn.
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