Rotary Hook
In sewing equipment, the most common type of sewing machine is the lock stitch sewing machine. Most ofthese sewing machines use a rotary shuttle, which hooks the loop with its hook tip, expands the loop, and guides the loop around the shuttle center to form a lock stitch. The rotary shuttle is an important component of a sewing machine. If the electronic control is the brain of the sewing machine, then the rotary shuttle is the heart of the sewing machine.
The working principle of a rotary hook is usually that after the needle rises a certain distance, the hook tip of the rotary hook bed begins to hook into the wire loop. The hook tip hooks onto the wire loop and continues to rotate. When the wire loop is sent to the guide rail of the rotary hook frame, the wire loop is hooked by the dividing hook of the frame. At this time, the needle should rise about 2mm from the lower limit position. The dividing hook on the rotary shuttle frame should have time to move the end of the wire ring to the back of the guide rail when the wire ring is about to approach. The angle between the dividing hook and the movement axis of the machine needle is about 50°. Hook the wire ring at 45° above the convex surface of the outer frame of the shuttle bed and continue to rotate. The end of the wire ring should be hooked onto the dividing hook. In order to ensure that the wire ring slides smoothly onto the surface of the shuttle frame, the slanted edge at the end of the wire board should pull the wire head of the wire ring outward, At the back of the loop, one side is hooked by the shuttle hook and slides down towards the bottom of the shuttle. At this moment, the needle exits the rotary shuttle mechanism.
Due to the smoothness of the shuttle frame passing through the thread, the loop smoothly slides out from the bottom of the frame. When the shuttle tip rotates 180 °, the thread picking rod rises and collects the remaining thread sent down before the thread picking rod. The shuttle tip hooks the loop and continues to rotate. The front half of the loop is under the wire board. After passing through the 45 ° slope of the convex surface of the outer frame, the edge of the moving wire board gradually rises above the shuttle frame, and the front half of the loop is pulled outward, The second half of the thread loop is hooked by the hook of the shuttle frame, and the thread loop is separated before and after. Finally, the front and back of the thread loop are covered by the shuttle frame, and the bottom thread is placed in the middle. The thread loop is tightened by the thread picking rod to form a thread pattern.
Shuttle Hook
The shuttle in a lock stitch sewing machine is driven by a semi rotating mechanism, which hooks the needle and thread ring of the machine with the shuttle and wraps it over the shuttle and its core sleeve, interweaving with the shuttle thread to form a lock stitch mechanism. When it comes to the swing shuttle, it cannot be separated from the rotary shuttle. Both parts are used to hook the thread and bottom line together for the needle. Whether it is the swing shuttle or the rotary shuttle, they are both designed to achieve this goal, but the design is different. Comparing the swing shuttle and the rotary shuttle together can also better introduce the swing shuttle.
The principle of forming thread traces by a rotary shuttle is basically the same as that of a pendulum shuttle, but the process and method of forming thread traces are different from those of a pendulum shuttle. The rotary shuttle rotates at an equal angular velocity, while the pendulum shuttle oscillates back and forth at different speeds; In a reciprocating motion of the needle (with the main spindle rotating once), the rotary shuttle rotates at an equal angular speed twice, while the swinging shuttle swings back and forth once; The rotary hook frame of the rotary hook is fixed, while the rotary hook bed is rotating. It is hooked by the hook of the hook bed to hook the thread ring, and the hook of the rotary hook frame is used to separate the thread, making it pass through the shuttle core sleeve and the bottom and upper edges of the hook frame, and form a thread ring from the surface of the rotary hook plate head.
As the "heart" of a sewing machine, hook directly determines the sewing effect. No matter you need rotary hook or large shuttle hook industrial sewing machine, please don't hesitate to KINGMAX.