How to adjust the needle position of computer parting

1. When the needle is installed correctly, the needle moves from the top to the bottom and the shuttle rotates. When the needle descends to the lowest position, the shuttle tip should be within 14- 18 and 10- 12 mm from the center of the needle. 2. When the machine needs to sew thin materials, the center distance between the needle tip of the shuttle and the needle should be adjusted to 8-12 mm. Just loosen the three fastening screws on the rotating hook and rotate the rotating hook clockwise by an angle, and the positioning distance will increase. 3. The formation of the needle tip is not directly related to the length of the needle tip. The needle tip rises about 2.2 mm from the lowest point. At this time, the shuttle tip is also located in the center of the concave edge of the short groove of the needle tip. The needle tip on the threaded ring is an ideal shape.

First, loosen the two fastening screws of the thread-cutting cam, align the thread-cutting point (according to the thread) on the upper wheel with the thread-cutting point on the housing, then brake the bobbin to the left until the bobbin stops, rotate the thread-cutting cam with the right hand to make the bottom thread cutter roll enter the curved groove on the thread-cutting cam, continue to rotate the cam in the same direction as the rotation direction of the lower shaft until it stops, and then tighten the screws in the order of the first and second screws. When the left hand pushes the shuttle brake lever to the right, the thread clamping plate of the second thread clamping device will automatically loosen, and the loosening amount is within 0.5 ~1mm. When cutting thread, if the thread clamping plate of the second thread clamping device is not loosened, the thread will easily fall off, but it will always loosen, resulting in the thread floating, which is equal to the complete failure of thread clamping. During the adjustment process, the loosening amount will increase. The function and adjustment of the spindle brake lever, the bending part of the spindle brake lever is equipped with a sliding sleeve and a small spring is installed to rivet it. The bobbin is braked by the elastic force of the small spring, so that the bobbin will not reverse due to the tension of the thread when cutting the thread. If the brake is too tight, the bottom line will be cut too short. Because of the brake, the bottom line will not rotate at all and will fall off. On the other hand, if the brake is extremely loose, the upper thread wound around the bobbin brake lever will slip off the lever during tangency, and the upper thread end of the needle will be short and the needle will fall off, so it should be adjusted correctly. Screw in and screw out will change the position of the limit block. It is adjusted that one end of the sliding sleeve sleeved on the brake lever just touches the spool, and the other end touches the score line on the brake lever. After carefully studying the cooperation and coordination of various mechanisms on sewing machines, Heavy Machinery Company not only heated the turntable thread take-up mechanism invented and patented in 1950s, but also studied the movement of the main mechanisms of sewing machines. When the needle bar is at the highest point, the thread take-up lever is still winding. This is the zero position (0) of the motion. 2. When the spindle rotates 64, the thread take-up rod reaches the highest point, and the standard is between 60 and 70. 3. When the needle reaches the plane 1mm away from the needle plate (i.e. when needling), it is 100. 4. When the needle tip reaches the plane of needle board, it is 1 16. 5.325 and 15 are the entry and exit times of the hub baffle respectively.