This machine has many functions of photo - electricity auto tracking, deviation, magnetic powder brake and clutch to control tension, as well as auto, count and preset count etc.

该机具有光电自动跟踪、纠偏、磁粉制动器和离合器控制张力，自动计数和预置计数等功能。

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This machine has many functions of photo - electricity auto tracking, deviation , magnetic powder brake and clutch to control tension, as well as auto, count and preset count etc.

该机具有光电自动跟踪、纠偏、磁粉制动器和离合器控制张力，自动计数和预置计数等功能。

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They then count back automatically from the preset time.

然后，他们回到计数自动从预设的时间。

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