< p > all kinds of < a href= "//www.pmae.cn/news/index_c.asp" > double needle car < /a > have a headache problem, that is, the car is unstable.

Maintenance rate is very high, especially after a few years, a lot of phase time is a bit messy, a lot of machine repair is how to adjust the adjustment is not good, according to the editor's point of view, a lot of phase time is well adjusted, there are no many problems.

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< p > first, let's start with pins and cloth teeth.

First, the cloth delivery (adjusting dial) is pferred to zero. When the cloth is not delivered, the flywheel is rotated so that the needle post is at the bottom dead center.

Loosen the horizontal delivery arm rocker fastening screws, adjust the distance between the inner side of the needle bar and the presser bar to 1.5mm.

If it is not adjusted, it will cause needle jumping and broken needles.

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< p > notice that there will be a change in the needle dropping point after adjusting the hole of the cloth hole, and it is necessary to adjust the feeding gear to cooperate.

The delivery time should be adjusted to the point of the horizontal feeding cam and the cutting point of the lower shaft.

The horizontal feeding cam should not be misplaced, otherwise it will make the rotation heavy, so that the needle will enter the center of the feeding hole. (very important, otherwise there will be a floating line phenomenon.) one mistake is that the general machine repair will adjust the needle bar to match the feeding hole and the drop point is not in the middle of the feeding hole, especially the long Kong Shihou! < /p >

< p > again is the time of needle and shuttle.

The lower dead point of the needle is adjusted according to the cloth condition of < a href= "//www.pmae.cn/news/index_c.asp" > sewing < /a >.

When the needle goes up from the lower dead point to 2.2mm (or the lower end of the lower line and the needle sleeve is flat), the distance between the needle and the shuttle spindle is 0-0.05mm, the distance between the needle and the needle is 0-0.07mm, and the center line of the needle is consistent with that of the spindle.

It depends on the actual situation.

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< p > turn the handwheel, so that the back line is placed in the final position.

The inner shuttle is rotated to the opposite direction in the reverse direction of the rotating shuttle to make the shuttle gear contact with the needle plate slot.

Loosen the fastening screws of the withdrawal line hook, so that the gap between the inner shuttle triangular block and the back line hook is too large for the 0.2-0.3mm. gap, causing loose and broken lines.

The clearance is too small, resulting in the damage of the thread withdrawal hook.

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< p > don't forget that the gap between the top of the needle slot and the shuttle is adjusted to 0.8-1.0mm.. The replacement of the a href= "//www.pmae.cn/news/index_c.asp" > the shuttle spindle < /a > is replaced by the sleeve plate on the rotating spindle.

Misunderstanding two is that the general machine repair will pad the needle board to adjust its clearance.

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< p > finally, the matching time of the upper shaft and the lower shaft is removed from the gear wheel.

Turn the handwheel to make the marking of the hand wheel and the cutting edge of the car on the top.

Rotate the lower shaft, so that there is a small hole on the frame and first screws on the lower shaft gear wheel.

Ensure that the upper axle and the lower shaft are not moved, and the synchronous toothed belt is installed.

If the time is not right, the needle dropping point, delivery time and mechanical clamping will be sent.

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