Janome Quilt Maker Pro 18 VERSA - Timing - Checking Loop Lift and Needle Distance; Importance of Timing and Distance; Tools Required for Timing; Loop Lift and Needle Distance Check

Janome-America.com
Page 21
11. Timing - Checking Loop Li and Needle Distance
Important Note: The ming and needle distance adjustment
must be done with the front machine cover on.
“Loop Li” is a universal hook and ming term for all lock-
stch sewing machines. When the needle lis a specied
distance from the BDC (boom dead center), the hook point
is set to coincide with the needle as shown in (Figure 11.1)
This is the radial posion of the hook called “Loop Li”,
commonly referred to as ming. Another part of ming is the
“Needle Distance” This is the axial distance from the hook
point to the needle. Loop li is the radial seng of the hook
and needle distance is the axial seng of the hook. Both of
these are set on the hook and xed with the same set screws.
Since two things are being set at the same me, this can be a
lile dicult unl pracced.
Tools required: Loop li clamp part #QM40199,
2.2 mm forked feeler gauge part #QM40136, 2
mm ball end L hex tool wrench, 2 mm handle hex
tool and a #3 at screwdriver.
Check: Observe and do the following before
aempng to make a hook ming adjustment.
1. Remove the needle plate.
2. Turn the hand wheel unl the needle bar is at its
lowest posion or BDC (Boom Dead Center)
3. Place the loop li clamp (with special protecve
compression pad) on the needle bar and set the
thumbscrew lightly.
4. Place the 2.2 mm feeler gauge between the clamp and the
boom of the head frame bearing surface (Figure 11.1).
5. Raise, reset and ghten the clamp, pinching the 2.2 feeler
gauge in between the clamp and projected bearing. This step
may need to be repeated a few mes to remove all excess
play between the clamp and gauge.
6. Remove the 2.2 feeler gauge (Figure 11.2)
7. Rotate the handwheel in direcon of moon (DOM); is very
important, unl the clamp lightly touches the gauging surface.
(Figure 11.3). Important: If the handwheel is turned too hard the
clamp may move, making the check invalid.
8. Check the radial posion of the hook point relave to the
needle. (Figure 11.4)
9. Check the axial distance between the needle and the hook
point. The hook point should lightly touch (brush) the needle
inside the scarf. Too much needle distance may cause shredding or
skipped stches.
Figure 11.1
Figure 11.2
Figure 11.3
Figure 10.4
Loop li and needle height both set correctly