So the machine has many controlling assemblies such as needle selecting, triangle changing, density adjusting, needle bed moving, thread-carrier changing etc.

因而机器有多类控制装置，如选针、三角变换、密度调节、针床横移、导纱器变换装置等。

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The principle, structure of the NBT-1 model of density adjusting unit were introduced. It can form a complete set with the density testing meter to control the density of the paper pulp.

介绍NBT 1型浓度调节器的结构、原理，该调节器与浓度变送器配套，可以控制纸浆的浓度。

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This paper introduces the working principle and structure of the weft density device of model JWG1724 rapier weaving machine, and analyses the calculating method of the weft density adjusting range.

介绍了JWG1724型剑杆织机纬密机构的工作原理及构成，分析了该机构纬密调整范围的计算。

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