Timing Of The Feed Motion - Baby Lock PRO BL8800 Service Manual

6. TIMING OF THE FEED MOTION

If the feed motion is too fast of foo slow, it will be the
cause of fabfic puckers or needle breakage. Check and
adjust the feed timing as follows:
1. Tilt the machine backward and remove the bed lid by
removing the screw and sliding it to the left. (sec. 3-5)
2. Check that the guide-lines on the lower shaft and feed
cam should be aligned. (fig. 6-1)
If it is not so, adjust as follows.
3. Loosen the two screws (a) on the feed cam with a
hexagon socket screw key (2 mm).
Hold the feed cam with a screw key and turn the
handwheel either direction until the guide lines on the
lower shaft and feed cam are aligned.
4. Tighten the screws (a).
Next, check the timing of the up-down movements.
5. Turn the handwheel toward you until the needle comes
to its lowest position.
At this time, the guide-line on the feed rock cam should
be coming to its lowest point. (fig. 6-2)
If not, adjust as follows:
6. Remove the base.
Loosen the two screws (b) on the belt pulley with a
hexagon socket screw key (2 mm). (fig. 6-3)
7. Turn the lower shaft so that the guide line comes to its
lowest point.
At this point, hold the lower shaft with a pair of pincers
not to retate and turn the handwheel until the needle
comes to its lowest position.
8. Tighten the two screws (b).
9. When you have adjusted the timing of up-down
movement, check the timing of hook again. (sec. 3)
fig. 6-1
fig. 6-2
fig. 6-3
- 9 -
a
Guide Line
Guide Line
b