842/845 Sewing M/C Helical Cylindrical Gear For 842/845 Twin-Needle Machine

In the context of the 842/845 twin needle machine, cylindrical gears may play various roles depending on their specific placement and function within the machine. Here are some roles that cylindrical gears can have in sewing machines:

1. Power Transmission: Cylindrical gears are commonly used to transmit power from one component to another within the sewing machine. They help transfer rotational motion and torque between different parts of the machine, such as the motor, shafts, and mechanisms involved in driving the needles and other moving parts.
2. Drive System: Cylindrical gears can be part of the machine's drive system, assisting in the transmission of power from the motor to various components. They help ensure efficient and synchronized movement of different machine parts, allowing for the simultaneous operation of the twin needles.
3. Needle Drive: Cylindrical gears may play a role in driving the needles' mechanism in the twin needle machine. They help transmit power from the motor to the needle bars, which control the up-and-down movement of the needles during stitching. The gears ensure precise and synchronized needle movement, contributing to accurate and parallel stitching with the twin needles.
4. Feed System: Cylindrical gears can also be involved in driving the feed system of the sewing machine. The feed system advances the fabric during stitching. Cylindrical gears help transmit power from the motor to the feed dogs or other feeding components, ensuring smooth and synchronized fabric feeding for both needles.

842 is a fixed single-needle bar double-needle lockstitch sewing machine, and 845 is a detached double-needle bar double-needle lockstitch sewing machine. Comparing the two, 842 is inconvenient for sewing [90° right angle] when turning a corner; when 845 is turning, one needle can be lifted and the other needles continue to work, making the corner more convenient and beautiful.

The 842/845 twin needle machine refers to a type of sewing machine that is designed to sew with two parallel needles simultaneously. This configuration allows for the creation of two parallel lines of stitching in a single pass. Here are some key features and characteristics of the 842/845 twin needle machine:

1. Twin Needle Capability: The 842/845 machine is specifically designed to accommodate two needles side by side. The machine has two needle bars and two needle positions, allowing for the simultaneous use of two needles during sewing.
2. Stitch Formation: With the twin needle setup, the 842/845 machine can produce two parallel lines of stitching on the fabric. These parallel stitches create a decorative effect and can also enhance the strength and durability of the seam.
3. Needle Spacing: The distance between the two needles on the 842/845 machine can usually be adjusted to achieve different needle spacing configurations. This allows for flexibility in creating different widths between the twin needle stitches.
4. Thread Tension Control: The machine typically includes separate thread tension mechanisms for each needle, allowing for independent tension adjustment. This ensures balanced tension in both threads, resulting in even and consistent stitching.
5. Feed System: The 842/845 machine may feature a feed system designed to accommodate the twin needle configuration. The feed dogs or other feeding mechanisms work in tandem to move the fabric smoothly and consistently, ensuring accurate stitching.
6. Versatility: Twin needle machines like the 842/845 are versatile and can be used for various sewing applications. They can create decorative stitching, topstitching, hemming, and other effects on a wide range of fabrics.