Machine power system

Motor power: The motor power of the internal wire machine is one of the key factors affecting the stitching speed. The greater the power, the higher the torque and speed that the motor can output, providing more powerful power for the high-speed operation of the machine. For example, a high-power (such as about 1000 watts) internal machine, compared with low-power (such as 300-500 watts) internal machine, the spindle speed can be faster, thus driving the sewing needle to move up and down more frequently, so that the stitching speed is accelerated.

Power transmission efficiency: In the process of transferring power from the motor to the sewing needle and the feeding mechanism, the efficiency of the transmission components is also important. If the fit between the transmission components (such as belts, gears, etc.) is tight and the friction loss is small, the power can be transferred more effectively. For example, the use of high-precision gear transmission, its transmission efficiency can reach more than 95%, can transfer the power of the motor to the needle rod mechanism almost without loss, to ensure that the sewing needle at a high speed stable movement, thereby improving the stitching speed.

Needle factor

The thickness of the needle: The thickness of the sewing needle will affect its resistance to travel through the material. Thinner needles (such as 14-18 gauge needles) encounter relatively little resistance as they penetrate the material and are able to sew at a faster rate. This is because the puncture area of the fine needle in the material is small and the friction it receives is also small. For example, when stitching thin sneaker fabrics and soles, thin needles can quickly move in and out of the material without affecting speed because of excessive resistance. In contrast, thicker needles (such as 9-12 gauge needles) may be limited in stitching speed due to their large puncture area and greater resistance when stitching materials such as thick leather.

Needle material and quality: high-quality sewing needle materials (such as alloy steel, etc.) have high hardness and toughness. This kind of needle is not easy to bend or break in the process of high-speed suture, and can maintain good puncture performance. For example, sewing needles made of high-speed steel have good wear resistance and fatigue resistance, and can work stably during continuous high-speed stitching, thus supporting higher stitching speeds. The poor quality needle may be deformed at high speed stitching, resulting in poor stitching and damage to the machine, so the speed must be reduced to ensure quality.

Properties of the stitched material

Thickness of the material: Thinner materials (such as fabric uppers and soles with a thickness of 2-5 mm) are easily penetrated by sewing needles, and the machine can sew at a higher speed. Because the sewing needle moves in the thin material with short travel and little resistance. Thick materials (such as thick leather soles more than 10 mm thick) require a greater travel of the sewing needle to penetrate, and will create greater resistance, so the stitching speed is usually reduced. For example, when stitching thin canvas uppers and soles, the lining machine can set a higher stitching speed, and for thick cargo leather shoe materials, the speed is much slower.

Hardness and toughness of materials: Materials with lower hardness and toughness (such as soft artificial leather) are easier to be pierced and stitched by sewing needles, and the stitching speed can be improved accordingly. On the contrary, materials with high hardness and toughness (such as natural leather) will have a large reaction force on the sewing needle, requiring the machine to run at a lower speed to ensure that the sewing needle can smoothly penetrate the material without damage. For example, when stitching soft dance shoe materials, because the material is easy to deform and puncture, the stitching speed of the internal thread machine can be much faster than when stitching hard leather work boots.

Machine design and regulation functions

Design of the feeding mechanism: The feeding mechanism of the interior machine is responsible for pushing the upper and sole materials forward according to a certain rhythm and speed to match the movement of the sewing needle. A properly designed feeding mechanism enables the material to pass smoothly and quickly through the sewing area. For example, the use of high-precision roller feeding mechanism, which has a strong grip on the material, can accurately control the feed speed of the material, and coordinate with the up and down movement of the sewing needle, thereby improving the overall stitching speed.

Speed adjustment function: The internal thread machine with flexible speed adjustment function can adjust the stitching speed according to different materials and stitching requirements. It can be adjusted reasonably within the speed range allowed by the machine according to the actual situation, such as the type of material, thickness and the precision requirements of the stitching. For example, some advanced internal sewing machines can be adjusted in the speed range of 100-2000 stitches per minute, so that they can be better adapted to various stitching tasks and improve work efficiency.