SPECIFICATIONS

Brand Name: NONE

Choice: yes

Material: Stainless steel

Origin: Mainland China

semi_Choice: yes

🧵 Product Information Description

This is the exclusive upper and lower bending needle set for BROTHER 9820 series round head locksmith machines, produced by the Q.X.YUN brand and also suitable for heavy-duty machines and Dukep locksmith machines of the same specifications.

• Structural composition:

Left side small bending needle: model S35410, is a lower bending needle responsible for hooking the surface line to form a wire loop.

◦ Right side small curved needle: model S35411, used as an upper curved needle, combined with a lower curved needle to complete the thread transfer.

· Middle long looper: models S35412 (left) and S35413 (right), which are large loopers from top to bottom, are the core parts to form round head lock eyeliner marks.

Material: High hardness alloy steel, polished chrome plated surface, wear-resistant and fatigue resistant, suitable for industrial high-speed sewing.

Brand logo: The top left corner is the Q.X.YUN brand logo, and the bottom text indicates that the applicable model is Brother 9820.

💡 Key adaptations and applications

Applicable models: Brother 9810/9820/9820A series round head locksmith, also compatible with heavy-duty 781, Dukep 580 and other types of locksmith.

Core function: It is used to sew round buttonholes of garment buttonholes, which can form beautiful and firm buttonhole stitches, prevent the edge of buttonholes from falling off, and is widely used in the production of middle and high-end clothing such as suits, shirts, jeans, etc.

Installation points: The upper and lower bending needles need to be accurately aligned, and the gap is usually controlled at 0.05-0.1mm to avoid needle jumping or wire breakage; During installation, it is necessary to manually rotate the handwheel to ensure that the bent needle does not collide with the machine needle.

✅ Selection and usage suggestions

Confirm that the model matches the model, S35412/S35413 is a large curved needle and S35410 is a small curved needle, which need to be replaced as a set to ensure stable stitching.

If used for sewing thick fabrics, it is recommended to choose high hardness and wear-resistant models to extend their service life.

• After debugging, it is necessary to test the sewing at a low speed, observe whether the keyhole stitch is flat and there is no stitch skipping, and then fine tune the position of the looper.