Highlead GC20528 User Manual
Customer
Copy
HIGHLEAD
GC20528 series
Service
Twin-Needle High Speed Split Needle
Sewing Machine
Instruction Manual
Parts
Catalog
Bar
Lockstitch
SHANGHAI HUIGONG
N0.3
SEWING MACHINE FACTORY
CONTENTS
PRECAUTIONS
PREPARATION
1.
Power
cable connection
2.
Connection
3.
Adjustment
CAUTIONS
1.
Oiling
(I)
2.
Oiling (2) -------------------------------4
3.
Oiling condition --------------------4
4.
Adjustment
5.
Cautions
BEFORE
FOR
of
control
of
needle
ON
USE
of
oiling
on operation
STARTING
OPERATION
-------------------------------------- 1
OPERATION
----------------------------------------------2
box
----------------------------------------3
bar
stop
1 -
to
rotating
position
hook
--------------------------------------3
---------------------------------------4
--------------------------------------
-------------------------------------5
OPERATION
1.
Installation
2.
Winding
3.
Selection·ofthread --6
4.
Threading
5.
Adjustment
6.
Setting
7.
Adjusting
8.
Threading
9.
Tension
10.
Balance
11.
Needle
12.
Adjustment
13.
Timing
14.
Adjustment
15.
Relationship
16.
Relationship
17.
Relationship
18.
Installation
19.
Adjustment
20.
Adjustment
21.
Sharpening
of
needles---------
of
bobbin
of
needle
offeed (stitch)
of
bobbin
of
needle
of
bobbin
adjustment
of
thread
thread
tension
of
presser
between
rotating
of
feed
between
between
between
of
movable
of
thread
of
meshing
of
fixed
------------------------------------------
thread ----------------------------------6
threads ------------6
length
and
stitch
reversing
-----------------------------7
thread
guide
threads
of
bobbin
tension
dog
--....-------------
-----------------
foot
p~essure
hook
height-------------------'---------------------------rotating
hook.motion
needle
knife-----------------------------------------------
trimmer
pressure
knife
__________
----------------------------------------7
------threads
motion
hook
motion
cam
and
needle
motion
and
of
movable
and
opener
and
---------------------------
feed
motion
dog
knife
(touch-back) --------------------------- 7
------------------8
---------------8
---------------·---------------------8
----8
-------------------9
motion----------------------------------------9
take-up
lever
motion
----------------------
motion
and
------------
fixed
knife
_,______
------------------------
--------------
--- 1 1
------
5
5
10
10
11
12
13
14
14
22.
Adjustment
23.
Wiper
for
change
adjustment --------------
of
needle
gage-----------------
SPECIFICATIONS
PARTS
1.
2.
3.
CATALOG
Arm
bed
its
Thread
Arm
tension regulator
shaft & presser
accessories----------·-------
mechanism-------------------------------·
foot
mechanism
-------
----------
15
16
17
18
20
23
4.
Needle bar rocking motion mechanism
5.
Stitch regulator mechanism
-------------------------------------------------------
-------------------------------------------------------------------
26
28
6. Lower shaft & feed rock shaft mechanism
7.
Hook saddle mechanism
8.
Knife
mechanism(
9. Knife mechanism ( = )
I 0. Touch back mechanism & detector mechanism
11.
Wiper mechanism
12.
Oil lubrication mechanism
13.
Accessories
GAUGE
PARTS
------------------------------------------------------------------------------------
LIAT
-----------------------------------------------------------------------
- )
-·---
-----------------------------------------------------------------------
-------------------------------------------------
--------------------------------------------------------------------
-----------------------------------------------------------
-------------------------------------------------------------------------
----------------------------------------------------
--------------------:--------------------------
·--------------------------
30
33
36
3 8
41
43
45
48
51
PRECAUTIONS BEFORES STARING OPERATION
1.
Safety precautions
I) When turning the power on, keep your hands and fingers away from the area around/under
the needle and the area around the pulley.
off
2) Power must be turned
3) The power must be turned
belt, adjusting the machine, or when replacing.
4) Avoid placing fingers, hairs, bars etc. near the pulley,
when the machine is operation. Injury could result.
5) Do not insert fingers into the thread take-up cover, under/round the needle, or pulley when
the machine is in operation.
If
a belt cover, finger guard, and/or eye guard are installed, do not operate the machine without
6)
these safety devices.
2.
Precaution before Starting Operation
when the machine
off
before tilting the machine head, installing or removing the
is
not used, or when the operator leaves his/her seat.
"V"
belt, bobbin winder pulley, or motor
"V"
I) If the machine's oil pan has an oil sump, never operate the machine before filling
2)
If
the machine is lubricated by a drop oiler, never operate the machine before lubricating.
is
3) When a new sewing machine
power on. (the pulley should rotate counterclockwise when viewed from the pulley.)
4)
Verify
the voltage and (single or three) phase with these given on the motor nameplate.
first turned on, verify the rotational direction
it.
of
the pulley with the
3. Precaution for Operating Conditions
I) Avoid using the machine at abnormally high temperature (35°C or higher) or low temperature (S°Cor
lower). Otherwise, machine failure may result.
in
2) Avoid using the machine
Avoid using the machine
welder and others,
is
dusty conditions.
in
areas where too much electrical noise, resulted from the high-frequency
generated.
-1-
PREPARATION
FOR
OPERATION
overall view
sewing machine
of
assembled
1. Power cable connection
1)
Connection
to
Power Supply
!:-.:--::~:?n.Jr'P,._-Balance
(included
1------r----1:.-:...-:...-:...-_-_-_-
_-
_-
_---r_,
wheel
synchronizer)
Control
box
When connecting the power supply connector to the control box, the connector should be completely
plugged
A.
In
phase to the white lead, and the
upon the setting
CAUTION: The green wire must be connected
B.
The appropriate power fuse capacity
2) Lamp Leads
A. When installing the illuminating lamp
in
the proper receptacle after confinning the connector type and matching direction.
case
of
three-phase electrical power system, the
"W"
phase to the black lead. The motor rotary direction depends, however,
of
the internal switch in the control box as described
motor properly.
is
as follows.
Power supply 200V-240V: I 0A
I00V-120V: ISA
(6V,15-20W),The connecting wire is
attached
It
removing the insulating tube from the wire
and stripping properly.
on
the back
should be removed and connected by
of
the Control box.
"U"
phase should be connected to the red lead, the "V"
to
the ground terminal
(a)
Bare
wire
Lampteads
in
Paragraph
in
order
(b)
Insulating
(2
to 3 turns
lnsldattng
tape
(2
to
3
turns
wrapped)
Lamp
1-P)
to
tape
wrapped)
leads
ground the
- 2 -
The
wire
connections should
be,
then, insulated
by
wrapping insulating tape
on
the wires.
CAUTION: The power switch must be Turned
B.
When
the
illumin.ating
shown
control
CAUTION: The illuminating lamp must not be connected with any heater, such as a foot warmer
in
box
the
will
3) Rotary direction
It
is
possible
left
side
of
the
built-in
motor
facing
lamp
pulley,
to
the
motor pulley, matching
2. Connection
The control box should
lamp
is
not
used,
the
figure
on
right side. If a short circuit occurs failing
be
possibly burned
and others,
transformer winding burned out.
to
change the rotary direction
front cover
in
the
internal switch
and
on
of
control box
in
on
when
rotating clockwise. The
be
connected
out.
parallel. Otherwise, the load capacity will be exceeded. It may cause
of
the
control
is
with
off
when
the
box,
machine prior
off
before connecting the lamp.
end
of
the
lamp
leads
must
be
insulated
to
insulate,
the
the motor by· removing the rubber cap
and
push
the
internal direction selector switch.
the
motor
is
rotating counterclockwise
rotary
direction
to
has
shipping
Roundhola
In
labla
been set
to
as
(a) or
(b)
transformer
from
as
the
facing
in
bottom
to
counterclockwise
as
the
The
the
as
3.
as
shown
Note:
(I)
(2)
Adjustment
1)
Adjust of"UP" position
When
machine stops
deviate larger
a)
Disconnect the plug (
to
the
right.
Be
sure
to
turn
for
safety before connecting
off
or disconnecting
The
combination
heads
with
the
panels
are
specified
Use
special care
combination
when
of
the
pedal
is
at
"UP" position. If
than 3 mm,
the
power switch
the
connectors.
of
the
machine
motor control
below.
for
the
correct
replacing
the
machine
head
needle bar stop position
kicked down
12
pins)
adjust
of
by
heel,
the
as
follows.
cable
the
marks
from
or motor control panel.
the
b)
c)
machine
Run
While
the
head.
machine
holding the
and
pulley,
stop
at
"UP" position.
insert the "adjusting
-3-
wh
lte
mark
Black mark
"UP"
position
"DOWN"position
tool" in the hole" A", then remove the tool.
2) Adjust
When the pedal is "Neutral" the machine stops at
5 mm, adjust
a) Disconnect the plug ( 12 pins)
the machine head
b) Run the machine and stop at
c) While holding the pulley, insert the "adjusting
3)
Confirm the stop operation, then set the plug (
pings) coming from the machine head into the
of
"Down"
tool"
in
the hole "B", then remove the tool.
receptacle.
as
follows.
position
of
"Down"
CAUTIONS ON USE
1.
Oiling (1)
Fill the oil reservoir with oil up to
Oil level should be periodically checked.
"L"
level is fottnd below
level replenish oil to
cable from
position.
"H"
mark.
If
oil
12
"Down
@
" position.
If
the marks deviate large than
"H"
level .
For oil, Use white spindle
2. Oiling (2)
When a new sewing machine is used for the first time,
considerably long time is used again, replenish a suitable amount
arrow
in
the below figure
oill.
--~~:.~
....
····
c-..
~ ·
·~
or
sewing machine left
of
oil to the portions indicated by
out
of
use for
3. Oiling condition
(I)
See
dripping
of
oil during operation through the oil sight window to check oiling condition in the
- 4 -
Quantit y of
oll
:2 - 3
drop•
(2)
machine
Please
with
mechanism.
arm.
use
respect
the oiling adjusting screw
to
oiling
to
take-up lever
Adjustment
4.
Cautions on operation
5.
a)
When
the
power
foot
away
b)
It
should
work
failure
c)
Since dust
malfunction or control troubles,
d)
Do
might
be
when
occurs during sewing machine operation.
in
not
apply a multimeter
damage semiconductor components
of
oiling to rotating hook
is
turned
on
or
off,
from
the
pedal.
noted
that the brake
the power
the
is
interrupted or power
control box might cause
may
be
to
the control circuit
keep
not
sure
to
keep
in
the
the
control box cover close during operation.
for
checking; otherwise voltage
circuit.
of
multimeter
OPERATION
l.
Installation
Note: Before installing
Double
lnalll
th1
1111d1
Iha
ICIIW
kNping
of
Needle
uplo
Iha
needles
the
bollllm
of
··"
nNdl
aide
lo,w
0
LOl'IDIJl'DCIH
Iida
the
of
n11dll
needles,
clamp
1ml
l'IH
tli,iten
lo
l'ICI
be
sure
to
turn off
lnlllfficienl
Inmon
the
power.
X
Needle
dillorled
X
-5-
2. Winding
of
bobbin thread
Note: When bobbin thread
Adjustment:
Tension
Conically wound thread
Length
of
wound thread
of
wound thread
is
wound, keep the presser foot lifted.
Slack winding
Move the thread guide toward smaller diameter
Loosen the thread length adjusting screw to increase length
of
thread and tighten the screw to decrease length
Winding
adjustlnv
amount
screw
is
recommended for polyester thread and nylon thread.
of
wound thread layer.
of
thread .
;;~
~~
~
)(
!~
x
f.
It(?!\
Vt
with il
tn<
80%
:,I •.
-:aoacitv
lfl<llf
>•mt
1II
~x
l!J
of
3. Selection
It
is
left needle (viewed from front), and
thread
use
of
thread
For bobbin thread,
twist thread can be used.
4. Threading
a) Pass each needle thread through thread guide A
Note: When thin slippery thread (polyester Thread
b) With the take-up lever located at the upper most position, pass each needle thread
shown
Note: Pressing the upper thread loosening button shown
of
thread
recommended to use
in
the right needle. When discriminate
needle threads
in
both the needles.
of
needle threads
thread through thread guide B as well.
in
the following figure.
"S"
twist thread
is
impossible, use
"S"
twist thread as well as
"Z'
in
twist
"Z"
the
twist
"Z"
or
filament thread, for example)
in
the figure below opens the saucer
is
used pass the
in
the order
of
the
upper thread tension adjuster, and the upper thread can easily pulled out.
-6-
@@
@@@
Needle
thread tension releasing button
IL9)
I
···-.
......
..
_
5. Adjustment
Note:
To
make
setting
Touch-back button
Stitching goes
direction
when
f11dlongth
Mtting
k
~
-----·- ·-·-
of
feed (stitch) length and stitch reversing (touch back)
feed
(stitch) length smaller, depress
dial
to
a desired position
..
. Direction
on
in
reversed direction while
the
button
dial
is
released.
of
stitching
-----~------------~
the
feed
reverse lever and set the
can
be
the
reversed
button
by
depressing this button.
is
held
down, and returns
I
I
"\
feed
to
forward
------------·
_ .----
length
6. Setting
leading
(I)
Pulling out thread
bobbin case.
(2)
Threading following ( I
(3)
Put
hook
(4)
Press
(5)
Leading
of
the
the
bobbin case
shaft.
the
bobbin bar.
the
bobbin
lower thread
lower thread over
and
from
side
)-(5)
to
rotating hook, then replace
install
A,
then
bed
the
install
plate .
bobbin
the
-7-
7.
Adjusting
of
needle thread guide
Please adjust needle thread guide
tension according to sewing condition.
8.
(I)
(2)
Thread
1uide
posit
ion
~-
hteriah
•edte
thread
supply
Threading
Put the hook into the bobbin case
and press down the latch .
The thread end should be left on the bed.
While holding the two needle thread by left
hand, rotate the wheel one
hand. By pulling up the needle threads, as
shown
Left
r)
The
thicker
then
standard
lore
of
bobbin threads
in
the figure, the bobbin threads will
~}
8
M
iddle
~)
Standard
Standard
tum
of
needle thread
Ri1ht
~)
The
thinner
than
atandard
Lesa
by right
be lifted. Both
thread should be aligned and led backward.
Tension adjustment
9.
11.
Needle thread tension
• Needle thread tension should be adjusted
reference to bobbin thread tension.
of
bobbin thread and needle
of
bobbin threads
in
10.
AO
BX~
cx.2~r
Balance
of
thread tension
r2:::,
'
::hi
12>
Balance
I
neade
bobbin
bobbin
tension
I~
or
lenelon
tension
~
loose
•
To
adjust needle thread tension, tum each tension
adjusting nut.
• Needle thread tension can be also adjusted for special
-8-
fabric and thread by changing intensity and movable range
12.
Adjustment
of
presser foot pressure
Pressure to fabric(s) can be adjusted by turning
The pressure adjusting screw.
13.
Timing between rotating hook motion and
needle motion
(I)
Set stitch length on the stitch length setting dial
shown table .
(2) When needle
lowest positional, as shown
following positional relationship should be maintained.
The upper edge
below the hook point.
The hook point should be located at the center
needle axis.
Gap between the hook point and the side face
needle should be 0.05mm.
is
lifted A shown table, from the
in
Figure, the
of
needle eye should be 1.0-I .6mm
of
of
of
slack thread adjusting spring.
Preeaure
Model -M
Set the
length
Needle life A
Oap
betwHn
hook po i
eds•
upper
of
stitch
nalld
reau I at
Inc
thunib
3 4.5
2.2mm 2.4mm
nt
and
I•
•Y•
•crew
-B
LJ~m'-11+--c:;5:::;c:=:==~
,-
Neadlo I lfe:
• Position adjustment
Adjust the hook point so that it comes to the center
of
hook point
of
needle axis.
(I)
Lean the machine head backward and loosen three
of
set screws
(2) Turn the balance wheel and stop when the needle
lifted A
hook shaft gear (small)
mm
shown table from the lowest position.
is
(3) Rotate the hook by hand to position the hook point to
of
the center
(4) Move the hook bracket leftward
needle axis.
or
rightward and posi-
tion it so that gap between the hook point and side face
of
needle is 0.05mm. For this adjustment, each screws
A, B and two
Note:
In
screws
the adjustment, do not excessively loosen set
C and always maintain meshing
of
C should be loosened.
of
hook shaft
Oenter
neadl•
Set:
of
axla
screw
of
hook
gear and lower shaft gear.
in
(5) Tighten the set screws
the following order:
a. While pressing the lower shaft gear (large) agains_t the
of
side face
hook bracket, tighten the set screws C first.
- 9
--
Set:
aor-
Set:
.
¢'
\
•c~
...-
e·
b.
After checking gap between the needle and the hook,
c.
Then tighten the set screws
• Position adjustment
Adjust needle position so that gap between the upper
of
edge
when the needle
needle eye and the hook point
is
of
lifted
B.
needle point
by A mm
from its lowest
is
1.0-1.6
mm
tighten the set screws
•
...
,.
'"
"'· 0 --
Needle
bar
acrew
A.
A__......~
~!
11
--
position shown
(I)
Loosen the needle bar screw A.
(2) Rotate the needle clamp B one circuit ( amount
Adjustment is 0.6mm ), or loosen the needle bar
screw C, rotate position screw D half a circuit ( amount
Be
(3)
14.
Needle bar stop position (left & right)
Note: The stopper wrench can be operated while the
(I)
(2) Stop the motion
(3) Two needles running at the same time:
15.
Relations between curve angle
sure to mark the needle clamp facing left side, Tighten needle bar screw C and A
sewing Machine running, but the best way
adjust while Take-up lever stopping at its highest
position.
Stop the motion
Make the stopper wrench to the position
Make the stopper wrench to the position
Press down restore plate, stopper wrench
restore to O position automatically.
in
before page.
of
left-side needle bar:
of
right-side needle bar:
and stitch length
(I)
Determine the stitch length according to
the form to obtain various.
of
(2) The needle number
can be obtained while the angle be determined.
(3) Example: While the angle is 40°,
is
2.9mm, then the outside needle number is 6.
another outside needle
if
the stitch
of
is
to
L.
R.
The
(while the
~
ourv:"'
anal•
40·
so·
so·
I
10·
80"
90·
100"
no·
120·
130·
of
adjustment
/
/
is
';
0.3
mm
I .
~\~
•
:;,;.,_ \ j--Stoper
.,,
;
_,.
\.
-\'
Bu,h
Inc
wrench
relation,
needle j
n_,.r
30·
b1tnen
••P
2 3
.._
5.5
4.6
3.8
3.2
2.7
2.2
1.8
1.5
ba~'!
...._
>---
needle
__
4.6
3.7
3.0
2.5
2. l
1.8
1.5
1.2
wrench
Needle nunier
(8)
atitoh
and
two
naedl11
4 5
_
:::f:
2.8
2.3
1.9
1.6 1.3
nHdle
i•
1/4)
2.7
2.
2
1.8 1.5
1.
5 1.3
1.3
----
).
..
.
number
6
4.0
----
2.9
I---
2.3
1.
9
L---·
7
3 .. 7
2.5
2.0
1.6
.,_..
8
3.0
2.2
l.
__
_
7
140"
I 1.1
-IO-
.
16.
Adjustment
of
feed dog height
Height
be
cautions:
• Fabric will be damaged
or
• Even stitch length cannot be assured
too low
• Feed dog height should be measured at the point where
the needle
For light fabrics······ Approx. 0.8mm from throat plate
For usual
a) Lean the machine head backward.
b)
of
feed dog and pressure
adjusted for individual fabric(s) with the following
if
pressure
For heavy fabriCS"""Approx. 1.2mm from throat plate
Adjustment procedure
Turn the hand wheel by hand and stop when the
of
presser foot
or
pressure
is
fabrics·"·"Approx.
of
presser foot is too small.
at the top position.
of
presser foot should
the feed dog extends too high,
is
too large.
if
the feed dog
1.0mm from throat plate
is
?U~mz
·~
-U~/lll:
04
! 0 .
!
8mm
1mm
1.2mm
Feed dog rises to the maximum height.
c) Loosen the feed bar set screw.
d) Vertically move the feed bar (in the direction indicated by arrow
adequate height.
e) After the adjustment, tighten the feed bar set screw.
• The feed dog height
17.
Relationship between rotating hook motion and take-up lever motion
When the timing belt (toothed belt) was removed for
its replacement, for example, the relationship between
rotating hook motion and take-up lever motion should
be
adjusted as follows:
a) Turn the balance wheel and stop when the take-up
lever
is
lifted to its top position.
b)
Lean the machine head backward and make sure the
arrow (timing mark) put on the timing belt
is
factory-adjusted to 1.0mm
is
in
line
in
the figure) to adjust
it
to
with the black line on the boss
c) If the timing mark
remove the timing belt and install it again to adjust.
is
not
of
hook shaft bearing.
in
line with the black
line,
-
11
-
Timing
belt
sprocket
18.
Relationship between hook motion and
opener motion
Approx.
0.2mm
a) Turn the balance wheel
the opener holder
by
hand and stop when
is
located most remotely from
the throat plate.
b) Make sure gap between the bobbin case holder
and the opener
c)
If
the gap
set screw
19.
Relationship between needle motion and feed dog motion
is
is
too large
Band
adjust position
approximately 0.2mm.
or
small , loosen the opener
of
the opener.
A
A
Opener
• The feet dog should be adjusted so that the needle can plunge into the feed dog needle
hole at the center
(I)
Set stitch length to "O" on the stitch length setting dial
of
the hole.
Feed
crri
shaft
<middle)
(2) Lean the machine head backward.
(3) Loosen the feed shaft crank set Screws A and B
(4) Set the needle at the lowest position.
(5) Adjust the distance between the pressure bar and
Screw
Feed
crar* (rlafrt)
Opener
shaft
hdder
the needle bar to be 13.5, and tentatively tighten
the screws
A and B
(6) Check that the right feed shaft crank
with the link at right angle, as shown
If
(7)
the connection
of
the feed shaft crank.
is
connected
in
Figure.
is
not at right angle, remove the
back cover, loosen screw C and move the needle bar rocking rod
of
(8) After the completion
adjustment, fully tighten the screws A , Band C.
Pressure
Feed
crlrit
bar
shaft
(rllht)
in
the arrow direction
to
adjust.
-
12
-
20.
(1)
a.
b.
c.
d.
Installation
Initial position
Turn
the
balance wheel
Push
the
cam
Turn
the
balance wheel
the
balance wheel.
Set
the
cam
of
movable knife
of
movable knife
and
follower crank
until
follower crank
lower
the
so
that
the
the black
at
this position
needle bar
cam
mark
to
the
lowest position.
roller enters into the thread trimmer
point
on
the
arm
meets the white mark point
with
a screwdriver temporarily preventing the
cam
groove.
on
cam
roller coming out
e.
Loosen
f.
Adjust
the
(2)
Gap between movable knife and bobbin case holder stopper
a.
Turn
lowest
the
the
fixed
knife,
the
balance wheel
position.
from
the
cam
groove.
thread trimmer rocking crank clamp bolts A
movable knife
as
shown
so
that the movable knife
in
Figure
and
tighten the bolts A
Thread
lr1mmer
rocking
crank
ror.kmg
by
hand
until
needle reaches
r.rnnk
and
B.
end
slant portion protrudes 0-0.5
and
B.
the
~-----------~
Monable
knife
mm
from
b.
With
the
needle
at
c.
21.
Adjustment
a.
b.
the lowest position, depress
turn
crank,
the
extremity
Manually
arrow
and
the
and
8 should
Tum
the
the balance
of
rotate the inner hook
in
Figure
and
inner hook stopper
be
of
thread trimmer cam
balance wheel
wheel
its
stroke.
adjust
loosened
by
until
the
in
the
gap
between
to
about
0.2
for
this adjustment).
hand
until
the needles
movable
direction indicated
mm
Maintaining the needle position, depress the
groove
of
thread trimmer
cam.
-
cam
the
movable
(the screws A
cam
13
follower
knife
reaches
by
knife
reach
the
lowest position.
follower crank
-
and
put the
cam
roller
into
the
c. Turning the balance wheel by hand, adjust the thread trimmer cam so that the movable knife starts
moving when the green mark point on the balance wheel comes in line with the black mark point on
the arm.
QI[-
22.
Adjustment
a. Turn the balance wheel by hand until the needles reach the lowest position.
b. Maintaining the needle position, depress the cam follower crank and put the cam roller into the groove
of
thread trimmer cam.
·-
of
needle threads tension release assembly
* To adjust, loosen two thread trimmer cam clamp screws A.
Green
mark
point
Cam
follower
Black
maik
point
Thread
trimmer
cam
c.
Turning the balance wheel by hand, adjust the thread tension release cam so that the tension disc close
when the white mark point on the balance wlieel comes
To adjust, loosen two tension release cam clamp screws
d. Opening degree
convex portion
To adjust, loosen the screws
e.
Make fine adjustment by loosening the nut
of
tension disc should be adjusted with the tension release roller B mounted on the
of
thread release cam, as shown
C and draw the wire.
in
D.
Fig.
in
line with the black mark point on the arm.
A.
White
park
point
(II)
,
Thre&I
trimmer
cam
ScrewC
-
14
-
23.
Adjustment
a.
Loosen the fixed knife bracket clamp bolt A.
b.
Turn the vertical positi~n adjusting screw B to adjust meshing pressure and then righter the hexagon
of
meshing pressure
of
movable knife and fixed knife
socket head cap screw
Note: Since excess pressure causes large
torque to the thread trimming mechanism
and trimming failure, adjust it so that
thread can be trimmed with minimum
pressure.
c. Move the movable knife and check that
the thread can be sharply trimmed.
24.
Sharpening
When the knives dull, the fixed should
be sharpened as illustrated
it
Since
replace it with a new one when it dulls.
of
is
very difficult to sharpen the movable knife,
A.
fixed knife
in
Fig.
Fixed
br-acker-
Hexacon
cap
scr-ew A
knife
socket
head
Ver-ti
cal
position
adjustinc
scr-ew B
25.
Adjustment for change
(I)
Replace the throat plate, feed dog and needle clamp.
(Since the throat plate and feed dog are special parts designed for thread trimming machine, be sure
to
use those specified by us.)
(2) Lean the machine head backward.
(3) Loosen two connecting link clamp bolts
(4) Remove the spring M.
(5) Loosen the hook bracket clamp screws A and
(6) When the needles and hooks have been adjusted, install the spring
(7) Contact the rocking cranks C and D to the stopper pins E and F and tighten the connecting link
clamp bolt
(8) Turn the balance wheel
(9) Loosen the nuts G and
( I
0)
Depress the cam follower crank Kand adjust the connecting rod L
smoothly enter the groove
J.
of
needle gage
J.
Band
adjust gap between each needle and hook.
by
band until the needles reach the lowest position.
H.
of
thread trimmer cam
..
Then tighten the nuts G and
M.
so
that the cam roller can
H.
(
11)
Adjustment
i.
Push the cam follower crank K so that the cam roller enters into the cam groove.
ii.
Turn the connecting rod
of
the cam groove and the cam roller
Land
adjust the clearance between the cam roller and the cam
-
15
-
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