Standard
value
Pedal
sensor
B
asm.
r-^
u u
Fig.
3-9
o Adjusting the accelerating point (from 200 spm)
Asshown in Fig. 3-10, the acceleratingpoint can be
adjusted
about1
mm
(0.039").
When
VR5
(MIN)
shownin Fig. 3-11is turned fully clockwise, the low
speedstroke shownby the solidline(Fig. 3-10)is
shortened,
resulting
in an earlier accelerating
timing.
When
VR5 is turned counterclockwise, the low speed
stroke is lengthened'as shown by the broken line,
resultingin a later acceleratingtiming.
(Normally, VR5 is turned fully clockwise before
shipment.)
3-5. Maximum sewing speed
1) Adjusting the low speed
-pot
I
eev y M(
cc a S S R87 5
....
s I
xoc
itu.
j f 3
M
n^an
r-MOO—
, • o
o~
J?'
VR2
VR3
VR4
VR5
S - m
rnrnrnrnrni-
s--s
I I I I I I I I I I
mm
mm
BT
SOFT
LSH
LSL
MIN
B-IUI
Fig. 3-11
o How to adjust the stroke for actuating the
AK-31
or
-34
Auto-lifter
For the sewingmachineprovidedwith the
AK-31
or -34,depressing the back part of the pedalraises
the presser foot just as with the knee switch.
Adjust the stroke for actuating the auto-lifter
usingVR6 (FLSW) in Fig. 3-6.
Tum
this dial
clockwise
to
increase
the
stroke,
or
counterclock
wise
to
decrease
it.
(Take care
not
to
tum
the dial excessively,other
wise the auto-lifter will be
kept
in its ON state as
if
the knee switch is
kept
turned ON when the
pedal is retumed to its neutral position.)
Fully
clockwise
About
1
mm
(0.039'
Low
speed
Pedal
stroke
Fig.
3-10
Fully
counterclockwise
o In the conventional
sewing
machine,thread trimming
speed determines the low speed. In this machine,
however,only the low speed whichis controlled by
depressing the front part
of
the pedal can be increased
usingVR3 (LSH)in Fig.3-11 without changing the
thread trimming speed.
Tum
the dial clockwiseto
increase the low speed of the sewingmachine, or
counterclockwise to decrease it. The adjustablerange
isfrom the threadtrimming speed(LSL)to approxi
mately
200
s.pjn.
(Normally, the dialhasbeen tumed fully counterclock
wiseat the time
of
delivery.)
-
25
-
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