Weft supply mechanism (electronic length measurement)
There are two commonly used forms: IRO length measurement form and PAW length measurement form (Kasuga length measurement also belongs to this type).
(1) IRO length measurement form
The style of the weft feeder is shown in Figure 3-11, see Section 15 for details. This type of weft feeder is also used in air-jet looms. 
(2) PAW length measurement form
PAW weft feeder is recognized as the most suitable Diversified weft yarns and unique roller-type weft feeder. Generally speaking, when the weft yarn picked several times is wound on the roller, the tension can be kept constant. The active roller not only rotates mechanically, but also tilts the yarn at a certain angle to gently place the yarn and prevent the overlap of the weft yarn. The gage of the yarn wound by the roller can be changed, and it is effective for all weft yarns. Its style is shown in Figure 3-12.
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