– 7 –
4) Adjusting the synchronizer
1. Loosen screw and remove cover .
2. Turn disk on this side by hand, and adjust the adjusting
mark "B" of disk in the rear to edge of disk .
3. Temporarily tighten the synchronizer to the lower main
shaft handwheel with screw .
4. When the power is turned ON, the sewing machine turns
approximately by one half and stops.
5. Turn OFF the power, and loosen screw .
6. Holding section of the synchronizer so as not to move,
turn the upper main shaft handwheel, adjust mark of the
handwheel to the position where mark on the machine
head side aligns with it, and temporarily tighten screw .
7. Again, turn ON the power, and conrm that the sewing ma-
chine stops at the position where mark of the handwheel
aligns with mark on the machine head side. Then tighten
screw .
8. After the adjustment, be sure to attach cover and tighten
screw .
9. After the adjustment above has been performed, when the
sewing machine stops at the DOWN position, top end of
the looper is located at the position where it has scooped
loop of left needle thread as shown in the gure 1.
When using the synchronizer as UP/DOWN
stop position type without using the thread
trimmer device, change the setting of
the function setting No. 74 to "1 (thread
trimming) / 0 (UP/DOWN position)". Thread
trimmer safety device error occurs unless
the setting is changed, and it is impossible
to operate the sewing machine. So, be
careful.
Fig. 1
WARNING :
To protect against possible injury to hands or
ngers due to abrupt start of the machine during
performing adjustment, perform the adjustment of
the stop position under the function setting mode.
