Working principle of sofa sewing machine

The working principle of sofa sewing machine is similar to that of general sewing machine, and its core lies in the coil sewing system. The following is a detailed explanation of the working principle of sofa sewing machine:

1. Coil sewing system

Needle and needle bar: The needle is a key component in the sewing process, and its needle eye is located behind the tip rather than the tail end. The needle is fixed to the needle bar, which is pulled up and down by a series of gears and cams.

Coil formation: When the tip of the needle passes through the sofa fabric (or other sewing materials), it pulls a small coil from one side of the fabric to the other side. This coil is the basis for the subsequent sewing process.

2. Coil capture and sewing

Coil capture: Under the fabric, there is a device that captures this small coil. This device may be a shuttle bed, a rotary hook or other type of coil capture mechanism.

Coil wrapping: The captured coil is then wrapped around another thread or another coil of the same thread. In this way, the fabric is firmly sewn together.

3. Intersection and tightening of sewing threads

Double-thread chain stitch: Through the above process, the intersection of sewing threads forms a structure similar to two locks locked together in the middle of the sewing material, which is called "double-thread chain stitch". This stitch structure makes the seam both firm and beautiful.

Tightening and finishing: With the cooperation of various mechanical parts, the machine will gradually tighten the sewing seam until a complete stitch is formed.

4. Auxiliary mechanism and operation

Feeding mechanism: In order to maintain the continuity and uniformity of sewing, the sewing machine is also equipped with a feeding mechanism. This mechanism is responsible for delivering the fabric to the bottom of the needle at a certain speed and direction.

Presser foot and tension adjustment: The presser foot is used to press the fabric to prevent it from moving, and the tension adjustment mechanism is used to control the tension of the sewing thread to ensure the quality of sewing.

5. Workflow summary

The needle moves up and down driven by the motor.

When the needle passes through the fabric, a small coil is pulled out.

The device under the fabric captures and wraps around this coil.

The sewing thread forms a double-thread chain stitch with the cooperation of various mechanical parts.

The feeding mechanism, presser foot and tension adjustment mechanism work together to ensure the continuity and quality of stitching.

In general, the sofa sewing machine achieves fast, efficient and high-quality stitching of fabrics through complex mechanical structure and fine collaboration. This technology has been widely used in industries such as sofa manufacturing.