Strobel KA-ED, Operating And Mechanic'S Instructions

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BA_KA-ED_A22_190313_en.doc
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Waves form length-wise across stitches
Possible reasons:
- Distance between stitches too large.
- Differential transport (rear pushing roll) set incorrectly.
- Foam rubber worn.
- Pressure for rear pushing roll set too high.
Solutions:
- Set lesser stitch distance, (see point “5.10.2 Setting the stitch distance (Fig.
13)“).
- Set differential transport (Fig. 27).
- Foam rubber must be replaced.
- Surface pressure differential transport drive (see point “5.9.3 Surface
pressure start-up reel“).

Waves form cross-wise in the stitches
Possible reasons:
-
Waves form in front of the needle plate if the upper transport is too little.
-
Waves form in behind the needle plate if the upper transport is too great.
-
With elastic materials the pressure of the transport support on the cloth
may be too great.
- With elastic materials the pressure of the differential transport roll may be
too great.
- The transport support cannot be aligned centrally towards the needle
plate cutout.
Solutions:
- Extending the stitch length with the stitch length knob 144.0156 by 0.5
mm, if necessary reduce carriage speed.
(see Spare parts catalogue page 26 bzw. 30)
- Shorten the stitch length by 0.5 mm, if necessary increase carriage speed.
- Reduce the transport support pressure with the screw 174.0433 (counter-
clockwise) (see Spare parts catalogue page 38)
- Reduce the contact pressure of the contact roller in the rear 230.0449 with
the screw 174.0351 (counter clock-wise) – fix position of the screw with
nut 179.0352.
(see Spare parts catalogue page 44 bzw. 48)
- Check whether needle plate cutout towards the plunger is central, align
needle plate if necessary. In case transport support is not aligned centrally
to needle plate, loosen the transport support with the screws 171.0406,
align and fasten again when aligned.
(see Spare parts catalogue page 38)