After the needle has risen a certain distance, the tip […]
After the needle has risen a certain distance, the tip of the hook bed is hooked into the loop, and the tip of the hook catches the loop and continues to roll. When the loop is sent to the guide rail of the hook frame, the loop is divided by the shuttle. The hook is hooked, and the needle should be raised by about 2 mm from the lower limit. The split hook on the hook frame should be close to the loop when the loop is approaching, so that the end of the loop is moved to the rear of the guide rail. The angle of the hook hook and the needle movement axis is about 50°, which is outside the shuttle tip. The wire loop is hooked at 45° on the convex surface of the frame, and the wire loop is continuously rolled. The end of the wire loop is hooked on the branch hook. In order to smoothly slide the wire loop onto the surface of the shuttle frame, the oblique edge of the tail of the wire plate is the wire loop. The thread head is turned outwards, and the rear part of the wire loop is hooked by the hook of the shuttle frame, and slides down to the bottom of the shuttle frame. At this moment, the needle is withdrawn in the hook mechanism. Because the shuttle line is very smooth, the wire loop smoothly slides out from the bottom of the shuttle frame, and when the shuttle tip is rotated through 180°, the thread take-up lever rises and the remaining part of the thread take-up is sent. Up, the tip of the hook catches the loop continuously, and the front half of the loop is under the wire guide. After the 45° bevel of the convex surface of the outer frame, the edge of the moving guide is gradually raised above the shuttle, and the front half of the loop is dialed out. open. The rear half wire loop is hooked by the shuttle branch hook, and the wire loop is separated back and forth. Finally, the front and rear loops are sleeved over the shuttle frame, and the bottom thread is placed at the center, and the wire loop is tightened by the thread take-up rod to form a stitch.
The operation cycle of the hook mechanism is between 203° and 312°, which is the stage of hooking the wire loop and enlarging the wire loop. Between 312° and 320°, the needle is withdrawn from the bobbin case and the exit phase is 0° to 180°. One turn of the upper shaft, two turns of the hook, and the second rotation.
The principle of the hook forming the stitch is basically the same as that of the shuttle, but the process and method of constructing the stitch are different from the shuttle: the hook is for the angular velocity rotary motion, and the shuttle is for the non-equal speed reciprocating rocking motion. In the upper and lower reciprocating motion of the needle (one rotation of the main shaft), the hook rotates at an equal angular speed for two weeks, and the shuttle swings back and forth once; the hook is fixed by the hook frame, and the rotary bed is rolled, it is The tip of the shuttle bed hooks the wire loop, and the hook is hooked by the hook to make it bypass the bobbin case and the bottom and upper sides of the shuttle frame, and the wire is separated from the surface of the hook plate to form a wire loop.