Necchi Supernova Instructions Manual

Contents

Necchi Supernova Instructions Manual Manual pdf 59 page image

MINOR ADJUSTMENTS IN THE UPPER GROUP OF THEZIG-ZAG MECHANISMWhen the needle positioning lever no. A85662 is in the centernotch and the zig-zag stitch lever handle No. 85620 is set at " O ",namely at the extreme left (after the cams have beenremovedfrom the machine), the needle must be in the center of the holeof the zig-zag stitch needle plate. If the needle is not in the centerof the hole, make the adjustment as explained in chapter " Im-portant adjustments to be made after re-assembling theuppergroup of the zig-zag mechanism ".The machine runs noisily when sewing zig-zag withdisconnected" automatic " mechanism. The cause of the noise can belocatedsomewhere in the upper group of the zig-zag mechanism, anditis advisable to check all the connections between the variousparts,to see whether any undue play sxists. Dismantle mechanismandcheck if and where excessive play exists. Especially checkthefit of the sector No, 26106 and the roller No. 26105. If necessary,replace the worn-out parts with new ones.Zig-zag sewing is noisy due to excessive play between thegearsNo. 26240 and No. C 85664. To adjust, proceed as follows:loosenscrew No. 048050 GEB which holds the gear No. C 85664 in thearm. By means of a screw-driver, to be inserted in the notch atthe upper end of the gear No. C 85664 (Fig. 53), turn slightly theeccentric support of this gear clockwise; the gear No. C 85664will then get closer to the gear No. 26240 and the play betweenthe two gears will thus be reduced. Tighten the screw No. 048050GEB firmlv after this adjustment.59Copyright -2004