Operating instructions

28. Thread Catcher

28.1 General

With the exception of subclass 579-151000, all subclasses have a

needle thread catcher as standard equipment. The subclass 579-151000

can be retro-fitted with the needle thread catcher, if desired.

The function of the thread catcher is automatically switched off by

buttonholes longer than 38 mm.

The fitting is not possible, however, when equipped with the “Upper

Gimp Guide” component.

Immediately after the thread trimming procedure, the needle thread

catcher grips the needle thread, holds it clamped and places it in the

right lip when the next buttonhole is sewn.

This offers the following advantages:

–

Secure seam beginning, even in light, loose fabrics.

–

Tightly pulled beginning stitches.

–

The needle thread does not need to be cleaned because the

beginning thread of the lip is sewn over.

Function sequence

–

After the turning-on of the automatic sewing machine, the needle

thread catcher lowers onto the material with the thread held clamped.

–

Appropriate to the prescribed sewing length, the sewing cycle is

turned on and begins with the right lip.

Thereby, the needle thread end positioned by the thread catcher is

overstitched and sewn in.

–

After reaching a point predetermined at the controls, the thread

catcher rises and moves back into the upper position.

–

Just before the seam end, the clamp of the thread catcher is

opened and the thread catcher moves downward.

–

After the end of the left lip, the needle positions in the up position.

The needle thread is cut.

–

The thread catcher swings forward. The clamp is closed. The

thread is caught.

–

The thread catcher swings back.

–

The thread catcher moves up.