In the adjustment process of a lockstitch sewing machine, precise regulation of the presser foot pressure is a critical step to ensure smooth fabric feeding and even stitches. Typically, pressure changes are achieved by rotating the screw at the top of the presser bar: turning it clockwise increases the pressure, suitable for heavy fabrics to prevent slippage; turning it counterclockwise decreases the pressure, ideal for lightweight materials to avoid leaving marks.
Recommendation: Before adjustment, always test the sewing performance under different pressure levels and refer to the recommended values in the equipment manual to prevent damage to the presser foot assembly from excessive pressure. Combined with optimization of the feed dog, this step can effectively enhance sewing stability and lay the foundation for further adjustments.