Brother International T-8422C Instruction Manual - English - Page 63

10. THREAD TENSION 10-5. Adjusting the thread take-up amount The thread take-up amount is adjusted by how the thread is 2928M passed through the thread amount adjuster (1). For all models except foundation specifications and T-8452C-405 Do not pass the thread through. Do not pass the thread through the thread amount adjuster (1). Loosen the screw (2) and slide the thread amount adjuster (1) to the right-side position. For foundation specifications and T-8452C-405 Pass the thread through the thread amount adjuster (1). The standard position of the thread amount adjuster (1) is when the screw (2) is in the center of the adjustment range. Center Pass the thread through. When the thread has been passed through the thread amount adjuster (1), the thread take-up amount becomes less when the thread amount adjuster (1) is moved to the right. It is better not to pass the thread through the thread amount adjuster (1): ・ When sewing heavy materials using a sewing machine with foundation specifications ・ When the thread take-up amount is not enough, such as when the stitch length is increased 2929M It is better to pass the thread through the thread amount adjuster (1): ・ When sewing with slippery threads such as synthetic yarns ・ When sewing light materials ・ When sewing with a stitch length of 2 mm or less ・ When sewing under any of the above three conditions and you would like to prevent skipped stitches, thread tightening problems such as looping, or thread breakages Thread take-up amount is too large 3018M Thread take-up amount is too small Start of movement < Guide to adjustment > The standard thread take-up amount is when the thread tension spring (3) starts to move when the loop is moved to point (B) which is slightly in front of point (A) where the rotary hook tip catches the upper thread loop and the rotary hook thread amount is at its maximum. • If the thread take-up amount is too large, the thread tension spring (3) will not start to move even after point (A) is passed. ..... This can cause skipped stitches, poor thread tightening and thread breakages. • If the thread take-up amount is too small, the thread take-up spring (3) will start moving before point (B). ..... This can cause thread breakages, overtightening of the upper thread and pulling of the seam. The thread take-up amount required will vary depending on the type of thread, the thickness of the material and the stitch length, so adjust the thread take-up amount to suit the sewing conditions. 3019M T-8421C, 8422C, 8452C, 8722C, 8752C 54