Like the car, the basic principles of most Patterns Sewing Machines are the same. The core of the car is the engine of the internal combustion engine, the center of the Patterns Sewing Machines is the coil stitching system.
The stitching method is very different from ordinary hand stitching. In the simplest manual stitching, the sewing machine puts a thread in the small eye of the end of the needle, and then passes the needle together through two pieces of fabric, from one side to the other, and then back to the original side. In this way, the needle moves into the fabric and stitch them together.
Although this is very simple for the manual, but it is extremely difficult to use the machine to pull. The machine needs to release the needle on one side of the fabric and then grab it again on the other side immediately. Then it takes all the loose lines out of the fabric, the direction of the stylus, and then repeats all the steps in the opposite direction. This process is too complicated for a simple machine, and is not practical, and even for the manual, it is only with a shorter line when easy to use.
In contrast, the Patterns Sewing Machines simply passes the needle through the fabric. On the needle, the eye is on the back of the tip, not at the end of the needle.
The needle is fixed on the needle bar, and the needle bar is moved by the motor through a series of gears and cams (to be described in detail later).
When the tip of the needle passes through the fabric, it pulls out a small coil on the other side. A device beneath the fabric captures the coil and wraps it into another strand or another coil of the same thread. In the next two sections, we will see how the system works.
The simplest coil stitching is chain stitching. To sew out the chain stitch, the sewing machine will ring the same length of the line behind the line. The fabric is located on a metal plate beneath the needle and is fixed with a presser foot. At the beginning of each suture, the needle pulls out a coil through the fabric. A coil-making device grips the coil before the needle is pulled out and the device moves synchronously with the needle. Once the needle is pulled out of the fabric, the cloth device (later described) will pull the fabric forward.
When the needle passes through the fabric again, the new coil will pass directly through the middle of the previous coil. The device that makes the coil will grab the line again and make the coil around the next coil. In this way, each coil will fix the next coil in place.
The main advantage of chain stitching is that it can sew very fast. However, it is not particularly strong, if the end of the line is loose, the whole sewing may be all loose. Most Patterns Sewing Machines use a more sturdy stitch called a lock seam. You can learn how the typical locking device works in the following animations.
The most important component of the locking device is the shuttle hook and spool assembly. The spool is a reel under the fabric. It is located in the center of the shuttle, which is driven by the motor and is synchronized with the movement of the needle.
As with chain stitching, the needle passes through the fabric to pull out a coil, and it raises it again while moving the cloth forward, and then sets the other coil. However, this stitching mechanism does not connect the different coils together, but instead connects them with another section of loosened from the spool.
When the needle is inserted into the coil, the rotating shuttle hooks the coil with the crochet. With the rotation of the shuttle, it pulls out the coil around the thread from the bobbin. This makes the stitch very strong.
This kind of hook, but also through the straight shuttle evolved from the.
Patterns Sewing Machines coil stitching principle evolved from the straight shuttle to the hook, it entered the mature period.