−
18
−
(1)
(2)
(4)
(3)
1.0 to 1.5 mm
3-11 Replacing the thread guide for knife
When replacing the thread guide for knife, loosen screws (2) and (3) shown in Fig. 17, and replace it with screw
(1) tightened.
If the installing angle of counter knife is moved, perform re-adjustment referring to the item of 3-7 “Properly
installing the counter knife”.
3-12 Adjusting the thread take-up picker
If thread take-up picker (Fig. 27 (3)) excessively enters in the direction of bobbin case when trimming thread,
bobbin does not rotate and bobbin thread is trimmed shorter than the standard. As a result, slip-off of thread
occurs at the start of sewing.
On the contrary, if it insufficiently enters, needle thread slips from the top end of thread take-up picker when
trimming thread. As a result, needle thread remaining at the needle top after thread trimming is shorter resulting
in slip-off of thread.
Marker line
1) Proper position of the thread take-up picker
Adjust the thread take-up picker so that bobbin thread is
lightly pulled out in the state that clutch plate (Fig. 27 (1))
is pressed in the direction of the arrow mark (right side).
At this time, as shown in Fig. 28, adjust so that a clearance
of 1.0 to 1.5 mm is provided between the top end of thread
take-up picker (bobbin presser) and the notch in the upper
section of bobbin. In addtion, after the clutch plate has
been pressed to the right, lightly press thread take-up
picker (3) and adjust so that the rear end of bobbin presser
is aligned with the marker line on the thread take-up picker
in the state that the play is removed.
2) Adjusting the thread take-up picker
Loosen screws (Fig. 27 (4)) and adjust so that the top end (bobbin presser) of thread take-up picker is located
as shown in Fig. 28.
To adjust the depth of thread take-up picker, move the position of picker link pin (Fig. 27 (2)).
After performing adjustment, tighten the lock nut of picker lik pin.
Fig. 27
Fig. 28
