Shang Wen came to the sewing workshop of female workers, which mainly produced airbags for airships. Now the airship needs to be rebuilt, and Shang Wen can't let them sit idle, so he asks them to make some clothes for Daqin's army stationed in the north.

Like the first sewing machine, it was born to make shoes. Shangwen's original purpose is also for this. Airships require a large number of pilots. These pilots need a lot of parachutes. Parachute requires paratrooper boots. Only wooden soles can be used for paratrooper boots. It is difficult for women to pierce through the board with their hands.

The sewing machine adopts the stitch stitching method. The stitch stitching method is very different from ordinary hand stitching. In the simplest hand stitching, the stitcher ties a thread in the small eye at the end of the needle, then passes the needle and the thread completely through the two pieces of fabric, from one side to the other, and then back to the original side. In this way, the needle drives the thread in and out of the fabric, stitching them together.

Although this is very simple for handwork, it is extremely difficult to pull with a machine. The machine needs to release the needle on one side of the fabric and then immediately grab it again on the other side. Then, it needs to pull all the loose threads out of the fabric, reverse the direction of the needle, and then repeat all the steps in the opposite direction. This process is too complicated for a simple machine and impractical, and even for manual work, it is only easy to use when a shorter thread is used.

In contrast, the sewing machine only needs to pass the needle part through the fabric. On the needle, the eye of the needle is just behind the tip, not at the end of the needle.

The needle is fixed on the needle bar. The needle bar moves up and down through a series of gears and cams. When the tip of the needle passes through the fabric, it pulls out a small loop from one side to the other. A device under the fabric will grab this loop and wrap it around another thread or another loop of the same thread. The principle is very simple, but the current sewing machine can only be used for shoes, because this is the first one, or a single-thread chain hand-operated sewing machine.

This kind of hand sewing machine can only be used when the sewing machine is turned on, and the actual meaning is not very great. First of all, it's okay to make shoes, but the firmness is different. However, the female workers were very excited. Watching the sewing machine punch and thread. As long as you shake your arm, you can do it by yourself, and you are very excited.

The simplest loop stitch is chain stitch. If you want to sew chain stitches, the sewing machine uses the same length of thread to loop the back of the thread. The fabric is located on a metal plate under the needle and is fixed with a presser foot. At the beginning of each stitching, the needle passes through the fabric to draw a loop. A device that makes a loop grasps the loop before the needle is pulled out, and the device moves in synchronization with the needle. Once the needle pulls out the fabric, the feed dog device will pull the fabric forward.

When the needle passes through the fabric again, the new stitch will pass directly through the middle of the previous stitch. The coil-making device will grab the wire again and make a coil around the next coil. In this way, each coil will hold the next coil in place.

The main advantage of chain stitching is that it can be stitched very fast. However, it is not particularly strong. If one end of the thread is loosened, the entire sewing may loosen. Most sewing machines use a stronger type of seam called a lockstitch.

The most important components of the lock stitching device are the hook and spool assembly. The spool is a coil of thread placed under the fabric. It is located in the center of the shuttle, which rotates under the drive of a motor, synchronized with the movement of the needle.

As with chain stitching, the needle passes through the fabric to pull out a loop, while the feed dog moves the fabric forward, it rises again, and then another loop is inserted. However, this stitching mechanism does not connect the different loops together, but connects them to another piece of wire that is loosened from the spool.

When the needle wraps the thread into the loop, the rotating shuttle uses the crochet needle to grasp the loop. As the shuttle rotates, it draws a loop around the thread from the spool. This makes the stitch very strong.

This kind of rotary shuttle also evolved from the straight shuttle.

The sewing machine's loop stitching principle has evolved from a straight shuttle to a rotary shuttle, and it has entered a mature period.

But for now, this maturity period is far from being reached. The next improvement work will be of great exploratory significance.

"Who invented this sewing machine?" Shang Wen asked. The term invention is a bit far-fetched. Because Shangwen has provided three kinds of sewing machine drawings before, one is the single thread chain sewing machine currently in use. The other is a chain stitch sewing machine with a needle and a hook. The last type is a mature lock sewing machine.

"Me, me." A child and a half stood up.

"Oh." Shang Wen suddenly became interested. The child looked only fourteen or five years old.

"What is your name and how old are you this year?" Shang Wen asked.

"My name is Bai Ai. It's fifteen this year." Bai Ai said.

"Where is the person?" Shang Wen asked.

"Qin Guoxian," Bai Ai said. As soon as Shang Wen heard the surname Bai, he guessed that the child was probably from Qin. Because Bai's surname is mostly in Qin.

"Is there anyone in the family?" Shang Wen asked.

"There is also an old mother. I'm sick." He lowered his head as he said. Shangwen understands what it means to be sick. It is estimated to be a serious illness of some kind. The current medical and health situation is so bad, Shang Wen doesn't want to think too much.

"Did you see the drawing of that sewing machine?" Shang Wen asked.

"Well, my master is watching. I accidentally saw it when I stepped forward to deliver the food." Bai Ai said.

The child only glanced at it and understood the principle. He seemed quite gifted. Shang Wen thought.

"Follow me in the future." Shang Wen patted Bai Ai's small shoulder and said.

"Follow me and fill in the form of the patent for this technology. You have obtained a technological invention. You get a reward of twenty gold." Shang Wen said with a smile.

\"Really." Bai Ai said happily.

"Really." Shang Wen said with a smile.

"However, I still have a few sewing machines. If you can understand them all. And can make them, then your technology patent will be rewarded very richly." Shang Wen said.

"Can I take a look?" Bai Ai said eagerly.

"Yes, come with me." Shang Wen shouted.

"That's right. To ladies." Shangwen uses the term "Ms." to be inappropriate, but to show respect for women. Shangwen still used it.

"I have a proposal, which is blending technology. Blend wool and hemp. Or silk and hemp. Then it is a brand new fabric. It has the warmth of wool and the breathability of hemp. How about it, try it. Make a new fabric. Reward ten gold." Shang Wen said with a smile.

"Ah, ten gold." The female workers exploded. They had never thought of so much money. The money is spent casually, enough for the rest of my life.

"Let's go." Shang Wen called Bai Ai. Then turned and left.