Pfaff coverlock 4772 Owner's Manual - Page 32
Fashionable
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Differential feed The differential feed consists of two feed dogs (A + B), arranged one behind the other, which move the fabric. Adjustment lever (34) regulates the movement of the front feed dog (A), and thus the amount of fabric to be fed through. It can be adjusted within the range 0.5 and 2.0. The standard setting is 1.0, by which the front feed dog (A) moves synchronously with the rear feed dog (B), i.e. the front and rear feed dogs both move the same amount of fabric. Note: The effectiveness of the differential feed also depends on the stitch length selec ted and the type of fabric used. / If differential feed adjustment lever (34) is set to 0.5, the front feed dog moves half as fast as the rear feed dog, i.e. the front feed dog feeds through only half as much fabric as the rear feed dog. As a result, the fabric is stretched. This prevents the seam from becoming ga thered when sewing very delicate fabrics such as silk and taffeta. The result is a smooth seam (A). Fashionable touches can also be introduced in this way, such as the wave effect when using rib knit (B). 28