Pfaff 339 Owner's Manual - Page 70
Unsatisfactory, material, puckers, terial
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Unsatisfactory feed of the ii: n terial: The material puckers: 1. Lint and thread ends in the feed assembly are impeding the smooth movement of the feed dog - remove the needle plate and thoroughly clean the 1. Both thread tensions are set too strong - loosen both upper and bobbin thread tension see page 25:. feed assembly. 2. The sewing foot exerts too much pres 2. The feed dog is set too low (normally when sewing the full height of the teeth should protrude from the sure - reduce the pressure following instructions on page 26. needle plate) - after removing the needle plate look up an expert and have the feed dog raised a little by 3. When sewing thin material - place some thin paper under the fabric and adjusting the lifter eccentric, l 72 set the stitch length not too long.
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