Big bag sewing machine

At the heart of the Union Lockstitch is its unique mechanism, which utilizes two threads—one from the needle and the other from a bobbin underneath the sewing plate. This lockstitch design creates a strong, durable seam that is essential for various types of fabric, including heavy materials like denim and lightweight textiles like silk. The machine operates by interlocking these two threads through a series of movement cycles, ensuring that the stitches are evenly spaced and consistent in tension.

2. Features and Functionality Overlock machines come with varying features, such as multiple thread options, differential feed, and built-in stitches. Machines that offer a wider array of functionalities typically come with a higher price tag. For instance, a 4-thread overlock machine can create more complex seams than a basic 3-thread model, making it worth the extra investment for advanced users.

1. Heavy-Duty Construction Upholstery fabrics are often thick and robust, such as canvas, denim, or leather. Seeking a sewing machine made with durable materials will ensure it can handle the stress of heavy fabrics without breaking or malfunctioning.