Adjustment Of Synchronous Belt Of Shoulder Pads

With the increase of use time,

The structure of shoulder pads is basically the same as that of upper sleeves, but it is much more than that of upper sleeves.

To solve this problem, the following is a summary of the adjustment operation of the replacement of the synchronous belt of the shoulder pads by taking the 697 of the type of shoulder pad machine as an example for reference by colleagues.

When the shoulder pads are replaced with the new synchronous belt, we can first hit the upper axle to the right. After installing the belt pulley, the upper axle can not move about and fix the upper shaft synchronous pulley. The wire pick rod is installed and placed in place, and placed in the pin rack (the needle slider should fall into the slot of the needle rack), then the needle rack block, the fixing block and the foot guide rail are installed.

Secondly, connect the presser foot and the feed presser connecting rod, locate the upper shaft needle bar, the feed presser foot up and down movement and the positioning screw on the cutter driving cam, tighten the fastening screws; basically locate the pin cam to connect their respective connecting rods, and install presser feet, machine pins, needle bar covers, head side covers, belt pulley covers, synchronizer and so on.

After installing the above components, you need to do the following

Adjustment of feeding of 1. needle and pendulum needle

The correct timing of the machine needle and pin feeding is: when the feed is finished, the tip of the machine just leaves the pinhole of the lower feeding tooth and is in the same plane with the lower feeding tooth.

Check the time phase of the feeding tooth and the machine needle, unscrewed the 3 screws to drive the cam, and turn the cam to the correct position, so that the needle is located in the center of the lower feeding tooth, then tighten the 3 screws of the driving cam.

Improper adjustment will lead to faults such as the size of the needle, the tight bottom line and so on.

Adjustment of cam driven by 2. and lower feeding teeth

The correct time phase is: the needle descends to the bottom dead point, and the lower feeding tooth reaches the highest point.

The upper and lower movements of the feed are controlled separately by the respective axes of the upper and lower axes, while the upper shaft has a positioning platform. When removing, the positioning screws must be removed and only the fastening screws are left.

When adjusting the lower shaft cam, we can adjust the lower shaft synchronous pulley or directly adjust the cam. If the adjustment is not in place, there will be no feeding, bottom line start and so on.

3. adjustment of feeding presser and presser presser foot.

The upper and lower movements of the feed presser and the presser presser are controlled by the upper cam with the same cam (the cutter is driven by the cam).

When the cam is installed, it can identify the positioning platform on the upper shaft. When the two presser work, the upper and lower switches are exchanged. The correct exchange phase is: the needle drops to the lower dead center, and the feed pressure foot also descends to the minimum, and the presser presser foot reaches the highest (the presser presser foot plate bottom is away from the needle plate 5mm).

Loosening drives the first connecting rod screw on the cam, adjusts the exchange height of the two presser feet. If the adjustment is not in place, there will be failures such as failure of feeding or too small needle.

Adjustment of 4. machine needle and rotary shuttle

The correct hook time of the machine needle and the rotary spindle is that when the machine needle picks up, the spindle point is located along the needle thread hole of the machine, along the 1mm, loosening the two screws of the lower fan gear of the rotary spindle to adjust the hook time. (after adjusting the fastening screws of the first connecting rod shaft on the cam, adjusting the two corresponding six angle screws, the needle bar can be adjusted early or late).

The left and right clearance between the spindle and the needle is 0mm to 0.01mm. The screws of the rotary spindle base are adjusted to adjust the left and right movements of the pendulum frame, and the needle can touch the needle slightly. If the adjustment is not in place, there will be a breakdown such as jumping and breaking.

In addition, attention should be paid to the wear of the shuttle spindle when adjusting. (the new shuttle point is about 2mm with the supporting line hook). If the wear is serious, the new shuttle should be replaced in time.