JUKI DDL-552-2 User Manual

IV. ADJUSTING THE MACHINE
This machine consists of lockstitching part and the thread trimming part. The lockstitching
function is same as all other previous models, so this text will cover the thread trimming part only.
1. Adjusting the timing of the thread trimming cam
1) How to judge the correct timing of the trimming cam
In order to change the length of the thread remaining at the needle eye after trimming, adjust
the timing of the thread trimming cam. This can be done easily by matching the arm with the
indicated line on the hand wheel, according to the kind of thread used-cotton or synthetic thread.
Tilt the machine, turn the hand wheel with your hand until the thread take-up comes just
before the upper dead point and if the sewing hook presser (Fig.16 (D) is pushed deeply to right, the
cam roller (Fig. 17) will enter the cam groove of the cam (Fig. 17) and will be interlocked there. In
that condition, rotate the hand wheel in the reverse direction than the conventional way, and the
hand wheel will come to a point where it will not rotate any more. At this point if cam timing is
matched so that the indicated line of the arm (Fig. 18 (D) and the indicated line of the hand wheel
(Fig. 18 (D) are matched together as shown in Fig. 18, it becomes a cotton thread timing. But if the
indicating line (Fig.l8 (D) is matched with the indicating line (Fig.l8 (D), it becomes a timing for
synthetic thread.
DLD-4322
Fig. 16
Thread trimming
cam
Cam roller
Cam roller shaft
arm set screw
Rotational direction
Mil
Rotate cam in this
direction with hand
Fig. 17
Thrust collar
Set screw No.2
2) How to match the timing of the thread trimming cam
First, loosen the 2 set screws of the trimming cam (Fig.17) in order from set screw No.l and
No.2, and match the indicating line of the arm with the indicating line of the hand wheel. (For
cotton thread, match red color (i) with the red color (D and for synthetic thread, red color (I) with
the green color (D), (Fig. 18)
Then, by pushing the sewing hook presser (Fig.16 (D) to right, interlock the cam and the cam
roller, and without rotating the hook shaft, rotate the cam only toward the reverse direction than the
normal hook shaft rotational direction with your finger tips. At the position where the cam does
not rotate any more, push the cam against the thread trimming cam thrust collar (Fig. 17) and
finally tighten the cam set screws (Fig. 17) in the order of No.2 and No.l.
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From the library of: Superior Sewing Machine & Supply LLC

JUKI DDL-552-2 Specifications

General

Brand	JUKI
Model	DDL-552-2
Category	Sewing Machine
Language	English