第二种是半积极式送经机构。

The second category is known as semi - positive let - off.

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第三种是积极式送经机构。

The third system is known as positive let - off.

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采用交换齿轮调节送经量的积极式送经机构。

Automatic yarn let-off system which used change gear drive for regulating run-in values.

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采用交换齿轮调节送经量的积极式送经机构。

Automatic yarn let-off system which used change gear drive for regulating run-in values.

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