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REV. 2.1 22-06-2020REV. 2.1 22-06-2020
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16. Thread pullers adjustment
The thread pullers must be adjusted correctly, in order to have a good stitch quality and to
avoid the stitch skipping.
The basic adjustment have to be done as indicated below.
16.1- Lower thread pulling cam adjustment
The lower thread pulling cam must tension up the threads when the needle bar is located in
the upper dead centre. If this operation is done before or after, this causes the triangle closure
in the wrong moment. If it’s too soon it may cause the skip stitch, otherwise the lower thread
may be not tensioned enough.
16.2- Upper thread puller adjustment
The upper head thread holder must be positioned parallel to the sewing head (see image 34.3),
the underwire for thread recovery must be positioned 5 mm above the needle bar thread
holder, when it is located in the lower dead centre (see image 34.4).
17. PULLER ADJUSTMENT
The leaver 1 (image 35.1) is to increase or reduce the transport of the puller device. It is very
important to synchronise the movement of the belt with the movement of the feed dog.
The feeding begins when the needle starts moving from Lower Dead Position upward stroke
(image 35.3) and it should be ensured that the Puller has stopped pulling before the needle
enters the fabric (image 35.4) on the downward stroke. Adjusting the puller belt timing, is
possible loosening the grab screws (1 & 2 image 35.2) and turning the shaft 3 of the puller
using a screw driver and synchronizing the movement of the belt with needle bar.
5mm
34.1
34.3
34.2
34.4
35.1
35.3
35.2
35.4
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