Bernina 740 Manual - Page 73

During ;sewing never pull the cloth too strongly towards the hack. G. Faulty scams ito A faulty uneven seam results: I. if then are thread ends remaining between the thread tension discs; 2. if there are thread ends under the bobbin case tension spring; 3. if the bobbin is deformed and jams in the bobbin case; 4. if the thread is not always evenly thick in all its length; 5. if the shuttle is not regularly oiled. b; When sewing trivet or other knitted good:. make aura of the following Items: I. tricot should always be basted with darning threat never with basting thread: 2. [Ise perfect needles of size no. 70 or no. 90: 3. the thin area of the fabric should always be placed to the left side of the presser foot ; 4. tines of needles and thread must always perfectly correspond: L. If the zigzag stitch seems not to be elastic enough, adjust for a larger width and a shorter stitch length, in order to increase the elasticity of the seam: co Disagreeably puckered fabric In most cases the rause of puckering Is too tight a tension as well on the upper as on the under thread. When sewing tricot and other knitted goods. the material must never be pulled to the hack with the hands: otherwise it will get puckered, of course. Care should be taken that when sewing tricot or the like the feed towards the presser foot be always sufficient. by means of eery lightly pushing the tricot on both sides of presser foot. 7. The machine operetta too slowty The motor does not work rorrcetly cIt should be examined by a skilled mechanic; Probable causes: at Tension of drive belt may be too tight. Ask the expert! bt The sewing machine has been Idle for a fairly long time in a nwdstened room In such n rase it 72