Operating instructions

3. Operation

3.1 Needles, yarns and gimps

Needles

Needle system: 579

Needle thicknesses: Nm 90-125

depending on the type of thread and material and the

sewing apparatus (E no.).

The needle thickness to be used for each machine and its sewing

apparatus (E no.) is given on the nameplate.

Yarns

The appearance of the buttonhole is greatly affected by the yarn used.

Synthetic-fibre yarns or even silk yarn can be used as the needle and

bobbin threads.

The appearance of the buttonhole is greatly affected by

–

the yarn used

–

the use of different thicknesses for the needle and bobbin threads.

Gimps

The gimp stabilises the buttonhole and at the same time gives it a

plastic shape.

It should have the following characteristics:

–

not too thick, but supple and strong

–

constant diameter.

The recommended yarns in the following table are only guidelines.

Other yarns and yarn thicknesses may be required, depending on the

sewing apparatus (E no.) and the material.

Subclass upper thread type bobbin thread type lower gimp thread type

and thickness and thickness and thickness

579-112000 polyester-fibre yarn, polyester-fibre yarn not required

schappe schappe

70/3 70/3

80/2 80/2

579-121000

-141000 poly-poly 80/2 poly-poly 80/2 poly-schappe 15/3

-151000