Bernina Artista 640 User Guide - Page 64

64 Buttonholes - Important Information Buttonholes - Important Information Marking Buttonholes Thread Tension • the tension is set automatically when a buttonhole is selected • the upper tension is slightly looser than normal • this gives a slightly rounded appearance to the beads, making the buttonhole more attractive • cord reinforces buttonholes and enhances their appearance • sew both beads at the same speed Manual Buttonholes • mark the buttonhole length in the desired position • use Buttonhole foot No. 3C Automatic Buttonholes • mark the length of just one buttonhole • after sewing the first buttonhole, the length for all subsequent buttonholes is automatically programmed • mark only the beginning of all subsequent buttonholes • use Automatic buttonhole foot No. 3A Keyhole Buttonholes • mark the bead length only • the correct length eye will be added when the buttonhole is sewn Test Sewing • always sew a test sample on the fabric with stabilizer you intend to use • select the buttonhole type you intend to use • sew the buttonhole in the same direction on the fabric (with or against the grain) • cut the buttonhole open • push the button through • adjust the buttonhole length if necessary Corrections To Adjust the Bead Width: • alter the stitch width Altering the Stitch Length: • any alterations to the stitch length affect both beads (more dense or less dense) • always reprogram the buttonhole after any changes to the stitch length If a buttonhole is to be sewn at right angles to a seam, we recommend the use of the height compensating plates for buttonholes (available as optional accessory). Place the plates from the back between fabric and bottom of slide foot up to the thick part of the fabric and push to front. Using the compensation plate (in some countries only available as optional accessory) is recommended when sewing buttonholes in difficult fabrics. It can only be used with the Automatic buttonhole foot No. 3A.