Brother International HE-800B Instruction Manual - English - Page 52

5. USING THE SEWING MACHINE (OPERATION PANEL: BASIC OPERATION) 5-6. Underlay programs Four types of underlay patterns are available. These four types can also be combined. Refer to the examples of use to determine which type of underlay to use. Parameter No. 41 43 42 46 Sewn-together underlays 3931Q Saw-shape underlays 3932Q Rectangle underlays 3933Q Underlay zigzag width 3934Q Sewn-together underlays ▪ This type of underlay pattern is used for resewing if the cutter has operated before the seam has been formed, such as when sewing is complete without the upper thread breaking even though the lower thread has run out. It is particularly useful for sewing up the hole made by the cutter beforehand at times when zigzag stitches do not hold properly. ▪ The pile of fluffy fabrics is pressed down before sewing, so that the buttonhole finish looks more attractive. Saw-shape underlays ▪ This type of underlay is useful for stretch materials to prevent them from stretching. ▪ It is useful for preventing dimples from forming during bar tacking. Radial-type buttonholes are useful for preventing dimples. ▪ It is also useful for strengthening the buttonholes to stop the seam from unravelling, which can often happen with materials with coarse weaves. Rectangle underlays ▪ This type of underlay is useful for stretch materials to prevent them from stretching. ▪ This is effective in preventing seams from unravelling in materials which appear not to have a very coarse weave. It also serves to reinforce the buttonhole. ▪ If the seam is hidden and the seam width seems small, you can sew 2 - 3 rectangle underlays to make the material look more voluminous. ▪ Underlays such as (1) to (9) in the illustration can be sewn in slightly different positions by changing the setting value for parameter No. 44 (underlay offset) so that the seam does not become too stiff and to further increase the feeling of volume. Underlay zigzag width If parameter No. 46 (underlay zigzag width for first cycle) is set after saw-shaped underlays or rectangle underlays have been set, zigzag underlays will only be sewn for the first cycle of saw-shaped underlays or rectangle underlays. ▪ This is particularly effective in preventing seams from unravelling in materials which appear not to have a very coarse weave. It also serves to reinforce the buttonhole. ▪ If parameter No. 46 (underlay zigzag width for first cycle) [Dimension A in the illustration] is set to about 0.4 mm, the zigzag underlay stitches will be even less likely to unravel than other underlay stitches. NOTE: ▪ When sewing underlays, the number of bar tacking stitches will increase, so that thread breakages or broken needles may occur. Reduce the number of underlays, or use shortcut key 1 or parameter No. 15 to reduce the sewing speed (zigzag part). ▪ When underlays above are sewn together, the order of sewing is sewn-together underlays → saw-shape underlays → rectangle underlays. 43 HE-800B