Janome Quilt Maker Pro 18 VERSA, Руководство по обслуживанию

Страница: 12 / 58

Page 12
Quit Maker Pro 18 VERSA
4 Checking and Securing Flats and Screws
Figure 4.1
Figure 4.2
The Quilt Maker Pro 18 VERSA has been designed using flats and special screws to help prevent loop lift timing from
slipping, except at the hook. (If the hook cannot slip then something has to break when something goes wrong. The
hook is designed to be adjusted without removing the front cover.)
First check the torque specifications chart on page 5,
then check the following locations, making sure that
the first screw of a timed component has been fixed
firmly on the respective flat on the shaft:
1 . The Pitman crank (Figure 4.1) (# 5 flat screwdriver
2.
The take-up lever driving link,
(Figure 4.1) (3 mm
handle hex tool)
3. The main shaft timing pulley (Figure 4.3) (2.5 mm
handle hex tool)
4. The hook-shaft timing pulley (Figure 4.5 on page
13) (2.5 mm handle hex tool)
.
Note: The screws are generally positioned 120 degrees
apart. When the first screw (Position 1) has been
located and tightened on a flat, the second screw is then
tightened, compounding the tightness of the first screw,
thus securing and assuring that timing will not change.
Note: The main-shaft thrust collar has been replaced with
a brass counterweight which is no longer located on a flat.
Note: It is important to check that the brass counterweight
tightening procedure did not create a tight arm shaft
condition. If so, readjust the counterweight again until
there is no tightness and minimal-to-no end-play. This is
checked by rotating the shaft and checking a few times
through a full 360° rotation of the shaft.
C ounterweight Timing
Set counterweight timing as follows.
First Pitman screw up, edge vertical and aligned with
lifter arm. At this position, the counterweight chamfer
(the bevelled edge) always goes to the left side next to the
bearing and the slit is straight down with screws on bottom
straight out at you ( Figure 4.2 ).
The counterweight has a slit and can be adjusted. It is not
set on a flat for timing.
Take-up Lever Driving Link 1
st
screw
Pitman Crank 1
st
screw
Figure 4.3
1
st
screw Main
Shaft Timing
Pulley on flat
Slit straight
down
Edge vertical