Manual Silvercrest SON 90 A1 - IAN 64780 (page 19 of 38) (English)

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Differential transport

Manner of operation

The machine has two sets of toothed rack feeders, one to the front and one

to the rear. Both sets move independant of each other. Through the differential

feed motion both toothed rack sets can move themselves at various speeds.

With this, the fabric is stretched or gathered, depending on which transport

differential has been set between the front and rear rack feeders.

With the aid of the differential transport, interesting effects can be achie-

ved when sewing overlock seams on stretch materials and diagonally cut

fabrics (Fig. 43).

Note:

When the differential transport lever 9 stands at "1.0", that corresponds

to a differential transport ratio of 1:1. Both toothed feed racks move at the

same rate (Fig. 42).

The differential transport lever 9 can be adjusted in a range from 1:0.7

to 1:2.0.

Gathered overlock seam - Settings

The gathered overlock seam is suitable for the ruffling of sleeves, back

upper parts, skirt seams etc.made of elastic materials such as knitwear

and jersey. The individual parts should be brought together before sewing.

• Adjust the differential transport lever 9 to a value higher than 1.0

(Fig. 44). The exact setting depends on the material to be processed

and the desired level of ruffling or gathering.

Therefore always do a sample stitching to test the settings.

Stretched overlock seam - Settings

The stretched overlock seam is suitable for the manufacture of ruffles at the

collar, cuffs and skirt edges etc. in soft, stretchy fabric and knitwear.

• Adjust the differential transport lever 9 to a value lower than 1.0 (Fig.

45). The exact setting depends on the material to be processed, and

on the strength of the desired "ruffle effect".

Therefore always do a sample stitching to test the settings.

• Hold the seam down with slight firmness before and behind the sewing

foot a so as to keep the textile under tension.

Note:

If you have set a value of "3" or higher on the adjustment wheel for the

stitch length 5, this setting will automatically return to "3" when you set the

differential transport lever 9 to 2.0.

Fig. 42

Fig. 43

Fig. 44

Fig. 45

IB_64780_SON 90 A1_LB6 08.03.2011 17:22 Uhr Seite 17

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Silvercrest SON 90 A1 - IAN 64780 Manual

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