Do You Know About Thread Take-up Lever, Rotary Shuttle, Sewing Shuttle, And Shaft?
Thread take-up lever
The main body and core of sewing equipment, taking a flat-bed sewing machine as an example, no matter how complex and precise its mechanism is, as long as the sewing material is sewn with needle and thread, it is inseparable from the joint movement of the four basic mechanisms: needle bar mechanism, thread hook mechanism, thread take-up mechanism, and feeding mechanism.
Among the four mechanisms, the mechanism for conveying, retrieving, and tightening the needle and thread is called the thread take-up mechanism. The thread take-up lever is responsible for collecting and releasing the upper thread in each sewing cycle and cooperates with the cloth feeding mechanism to complete the formation of sewing stitches. The thread take-up spring, thread clamp, and thread slow hook are all subordinate to the thread take-up mechanism. Properly adjusting the tension and thread take-up accessories is an important condition for maintaining good stitches.
The working characteristics of the thread take-up mechanism are the up and down movement of the thread take-up lever hole. When the thread take-up lever moves downward, it supplies thread to the descending needle, and when the rotary shuttle hooks the upper thread, it supplies the upper thread to the rotary shuttle until the upper thread passes around the shuttle frame and ends. When the thread take-up lever moves upward, it is responsible for taking the upper thread off the shuttle frame and tightening the stitches formed in the sewing material to form a firm stitch, and pulling the upper thread out of the thread ball to prepare for the formation of the next stitch.
Rotary shuttle, sewing shuttle
> Rotary shuttle
Among sewing equipment, sewing machines with lockstitch stitches are the most common. Most of these sewing machines use rotary shuttles, which hook the thread loop with their shuttle tips, expand the thread loops, and guide the thread loops around the shuttle core to form lockstitch stitches. The rotary shuttle is an important part of the 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 rotary shuttle consists of a shuttle bed, a rotary shuttle skin, a rotary shuttle plate, and a rotary shuttle frame.
The working principle of the rotary shuttle is that after the needle rises a certain distance, the shuttle tip of the rotary shuttle bed begins to hook into the thread loop. After the shuttle tip hooks the thread loop, it continues to rotate. When the thread loop is sent to the guide rail of the rotary shuttle frame, the thread loop is hooked by the thread dividing hook of the shuttle frame. At this time, the machine needle should rise about 2mm from the lower limit position. The thread dividing hook on the rotary shuttle frame should leave time for the end of the thread loop to move to the back of the guide rail when the thread loop is about to approach. The thread dividing hook and the axis of the needle movement are about 50°. The thread loop is hooked at 45° from the upper convex surface of the outer frame of the shuttle bed shuttle tip, and it continues to rotate. The end of the thread loop is hooked on the thread dividing hook. In order to make the thread loop slide smoothly onto the surface of the shuttle frame, the bevel at the tail of the wire guide plate pushes the thread head of the thread loop outward, and the back of the thread loop is hooked by the thread dividing hook of the shuttle frame and slides to the bottom of the shuttle frame. At this moment, the machine needle withdraws from the rotary shuttle mechanism.
> Sewing shuttle
The sewing shuttle in the lockstitch sewing machine is driven by a semi-rotating mechanism. The sewing shuttle hooks the needle thread loop and passes through the shuttle and its bobbin case to interweave with the shuttle thread to form a lockstitch. When it comes to the sewing shuttle, the rotary shuttle is indispensable. Both parts are for the needle to hook the thread and the bottom line together. Whether it is the sewing shuttle or the rotary shuttle, they are for this purpose, but the design is different. Comparing the sewing shuttle and the rotary shuttle together can also better introduce the sewing shuttle.
The principle of the rotary shuttle to form stitches is basically the same as that of the sewing shuttle, but the process and method of forming stitches are different from those of the sewing shuttle. The rotary shuttle rotates at a constant angular velocity, while the sewing shuttle swings back and forth at unequal speeds. When the needle makes one up and down reciprocating motion (the main shaft rotates one circle), the rotary shuttle rotates two times at a constant angular velocity, while the sewing shuttle swings back and forth once. The rotary shuttle frame is fixed, and the rotary shuttle bed is rotating. The tip of the shuttle bed hooks the thread loop, and the hook of the rotary shuttle frame divides the thread, so that it passes around the shuttle core and the bottom and top of the shuttle frame, and the thread is taken off from the head of the rotary shuttle plate to form a thread loop.
Shaft
Industrial sewing machines are mainly a complete system consisting of four moving parts. The front end is the piercing part, which uses the machine needle to pierce the sewing material and then gradually tighten it to form a coil. The thread picking part is the machine head piercing part that continuously supplies the thread and can be quickly retracted when the coil is recovered. The thread hook part uses the threads on the front end of the rotary hook shaft to tie each other before starting to work. The cloth feeding part is responsible for quickly supplying sewing materials to the machine head after completing a complete sewing work. The presser foot part is used to press the sewing material and change the spacing of the stitches. These are all coordinated and synchronized movements between the mechanical mechanisms of the sewing machine to ensure that the sewing machine can successfully complete the sewing work. The movement of these mechanisms requires a part to be completed, that is, the shaft.
According to the types of shafts required by different types of sewing machines, they can be divided into straight shafts and crankshafts. Straight shafts are mostly used in flat sewing machines, and crankshafts are mostly used in overlock sewing machines and interlock sewing machines; according to the function of the shaft, it can be divided into upper shaft, lower shaft and vertical shaft. Taking the flat sewing machine as an example, the upper shaft of the flat sewing machine drives the needle bar mechanism and the thread taking mechanism to move, the lower shaft drives the thread taking mechanism centered on the rotary shuttle, and the vertical shaft plays the role of connecting the upper and lower shafts.
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