The working principle of the hook, the basic definition of the hook

The working principle of the hook is usually after the needle rises a certain distance, the tip of the hook bed begins to hook into the wire loop, the tip of the hook hooks the wire loop and continues to rotate, when the wire loop is sent to the hook frame guide rail mouth, the wire loop is hooked by the shuttle frame split hook, and the needle should rise about 2 mm from the lower limit position. The hook on the hook frame should be close to the ring, so that the end of the loop has time to move to the back of the guide rail, the angle between the hook and the axis of movement of the needle is about 50 °, hook the loop at 45 ° above the convex surface of the shuttle tip frame of the shuttle bed, continue to rotate, the end of the loop is hooked on the hook, in order to make the loop slide smoothly to the surface of the shuttle, the hypotenuse of the tail of the wire strip is the end of the loop to be dialed outward, and the rear part of the loop is hooked by the hook of the shuttle frame on one side, slides down to the bottom of the shuttle, at this moment, the needle exits in the hook mechanism.

Because the shuttle frame is very smooth at the wire crossing, the wire loop slides out smoothly from the bottom of the shuttle, when the tip of the shuttle can be turned 180 °, the take-up rod rises, the remaining part of the line sent down before the take-up rod is collected up, the hook tip hooks the wire loop and continues to rotate, the front half of the wire loop is below the wire plate, after passing the 45 ° inclined plane of the convex surface of the outer frame, the edge of the wire plate that is moving, gradually rises above the shuttle frame, and the front half of the wire loop is set outward The second half of the wire loop is hooked by the hook of the shuttle splitting line, and the wire loop is separated before and after, and finally the front and back of the wire loop are set over the shuttle frame, put the bottom thread in the middle, and tighten the wire loop through the wire pick up rod to form a stitch.

The operating cycle of the hook mechanism is between 203° and 312° is the stage of hooking and expanding the wire loop, and between 312° and 320° is the stage when the needle exits from the bobbin sleeve on the missing day, and 0° 180° is the idle stroke. The upper shaft rotates once, the hook rotates twice, and it has an effect on the second rotation.

The principle of the hook forming stitches is basically the same as that of the swing shuttle, but the process and method of forming the stitches are different from the swing shuttle: the hook is a rotational motion with equal angular velocity, while the swing shuttle is a reciprocating swing motion with unequal velocity; In a reciprocating motion of the needle up and down (the spindle rotates for one time), the hook rotates at an isoangular speed for two weeks, and the hook swings back and forth once; The hook is fixed by the hook frame, the hook bed is rotated, it is hooked by the tip of the shuttle bed, and the hook is divided by the hook of the hook frame, so that it bypasses the bottom and upper edge of the hook core sleeve and the shuttle frame, and the line is disconnected from the head of the hook plate to form a wire loop.

The structure and working principle of the shuttle valve are intuitively demonstrated by 3D animation.

The advantages and disadvantages of rotary hook and swing hook are as follows:

Among sewing equipment, sewing machines with lock stitch stitching are the most common. Most of these sewing machines use a hook, which uses the tip of the hook to hook the loop, while enlarging the loop and guiding the loop around the bobbin to form a lock stitch.

The operating cycle of the hook mechanism is between 203° and 312° is the stage of hooking and expanding the wire loop, between 312° and 320° is the stage when the needle exits from the bobbin core sleeve notch, and 0° 180° is the idle stroke. The upper shaft rotates once, the hook rotates twice, and it has an effect on the second rotation.

The principle of the hook forming stitches is basically the same as that of the swing shuttle, but the process and method of forming the stitches are different from the swing shuttle: the hook is for the rotational motion of equal angular velocity, while the swing shuttle is for the reciprocating swing motion of unequal velocity; In a reciprocating motion of the needle up and down (the spindle rotates for one time), the hook rotates at an isoangular speed for two weeks, and the hook swings back and forth once; The hook is fixed by the hook frame, the hook bed is rotary, it is hooked by the tip of the hook bed, and the hook is divided by the hook frame, so that it bypasses the bobbin core sleeve and the bottom and upper edge of the shuttle frame, and takes off the line from the head of the hook plate to form a wire loop.

The advantages and disadvantages of rotary hook and swing hook are as follows:

Among sewing equipment, sewing machines with lock stitch stitching are the most common. Most of these internal sewing machines are equipped with a rotary hook, which hooks the loop with its tip, enlarges the loop, and guides the loop around the bobbin core to form a lock stitch.

The operating cycle of the hook mechanism is between 203° and 312° is the stage of hooking and expanding the wire loop, between 312° and 320° is the stage when the needle exits from the notch of the bobbin sleeve, and 0° 180° is the idle stroke. The upper shaft rotates once, the hook rotates twice, and it has an effect on the second rotation.

The principle of the hook forming stitches is basically the same as that of the swing shuttle, but the process and method of forming the stitches are different from the swing shuttle: the hook is for the rotational motion of equal angular velocity, while the swing shuttle is for the reciprocating swing motion of unequal velocity; In a reciprocating motion of the needle up and down (the spindle rotates for one time), the hook rotates at an isoangular speed for two weeks, and the hook swings back and forth once; The hook is fixed by the hook frame, the hook bed is rotated, it is hooked by the tip of the shuttle bed, and the hook is divided by the hook frame, so that it bypasses the bobbin core sleeve and the bottom and upper edge of the shuttle frame, and the line is taken off from the head of the hook plate to form a wire loop.

The hook is an important part of the sewing machine, and the principle of the hook forming the stitch is basically the same as the hook, but the process and method of forming the stitch are different from the hook.

The hook is an important part of the sewing machine, and among the sewing equipment, the sewing machine with lock stitch is the most common. Most of these sewing machines use a rotary hook, which hooks the loop with its hook tip, expands the loop at the same time, and guides the loop around the center of the shuttle to form a lock-off stitch.