Underlay Programs - Brother HE-800C Instruction Manual

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.
41
Sewn-together underlays
3931Q
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
Parameter No.
43
Saw-shape underlays
3932Q
HE-800C
42
Rectangle underlays
3933Q
46
Underlay zigzag width
3934Q