HIGHLEAD GC20698 Series User manual
•
HIGHLEAD
Purchasing
Dept
Copy
GC20698 Series
Long
Arm
Version,Compound-feed,Heavy
Material Lockstitch Sewing Machine
Instruction
Manual
Parts
Catalog
SHANGHAI HUIGONG
N0.3
SEWING MACHINE FACTORY
CONTENTS
PRECAUTIONS
BEFORE
STARTING
OPERATION
-------------------------------------- l
PREPARATION
FOR
OPERATION
l. Power cable connection --------
·---
--------------------------------2
2.
Connection
of
control
box
----------------------------------------------------------------------3
3.
Adjustment
of
needle
bar
stop position ---------------------------------------------------------3
CAUTIONS
ON
USE
I. Oiling (
l)
----
-
-------
----
--------------------------------------4
2.
Oiling(2)
-----------------·--------------------------------------------------4
3.
Oiling condition --------------- ·
------------------------------------------------------4
4.
Adjustment
of
oiling to rotating hook -----------------------------------------------------------5
5.
Cautions on operation --
--
------·
---------
--
---------------------------------------------5
OPERATION
1.
Installation
of
needles---
---------------------------------
--
-----------------------------5
2.
Winding
of
bobbin thread
----------------------------
--
------
--
-
--------------6
3. Selection
of
thread ---------------------------
·--------
----
--
-----------------------------6
4.
Threading
of
needle threads ---------------------------------------
--
----
-----------------------6
5.
Adjustment offeed (stitch) length and stitch reversing (touch-back) -
----
--
----
--
----
--
--
-----
--
7
6.
Setting
of
bobbin -------------------------------------------------------------------------------7
7.
Threading
of
bobbin threads
---------------------------
------------------------------------
-----8
8.
Tension adjustment
of
bobbin threads ----------------------------------------------------------9
9. Balance
of
thread tension ----------------
------
--
----
--
-
----
--
----
--
---
---
----
--
----
--
----
---
--9
10.
Needle thread tension -----
--
--
-
--
----
---
---
--
----
--
-----
---
--
----
--
---
--
-
--
-----------9
l l. Adjustment
of
presser foot pressure
-------------------------------------
----------------9
12.
Timing between rotating hook motion
and
needle
motion
--------------------------------------9
13.
Adjustment
of
feed dog height
______
_
_____
_
____________
\_
_______________________
_
_____________
10
14.
Relationship between rotating hook
motion
and take-up lever motion
------
----
--------------
11
15.
Relationship between hook motion and opener
motion
---
----
--
---
----
--
-
--
-·- - - - ---
11
16.
Relationship between needle motion
and
feed
dog motion ------------------------------------
11
17.
Safety clutch device ----------------------
--
----------------------------------
--
--------------
12
18.
Upper
feed
adjustment (needle side)'--
--
----
--
-------------
-------------
---
---
-------
13
19.
Outside presser foot and inside presser vertical stroke adjustment -
--
----
--
----
---
14
20.
Adjustment
of
forward/backward stitch
length
-
--
----
·-
--
--
---
--
--
--
-
--
----
--
----
--
14
21.
Installation
of
movable knife ---
--
-
---
---
--
-
--
-
---
-
--
----
------
---
---
-
--
-
--
----
---
---------
---
14
22.
Adjustment
of
thread trimmer
cam
---
--
---------
---
----
--
-------
--
- ----
----
--
---------
15
23. Adjustment
of
needle threads tension release assembly -
--
--
- --
--
--
16
24
. Adjustment
of
scissoring pressure
of
movable
knife and fixed knife
---
---
--
-----
·----
-----
16
25.
Sharpening
of
fixed knife-----
--
---
----
--
----------------
--
-
--
----------
--
---------
---
---
--
--
-
17
26.
Adjustment for change
of
needle
to
needle distance---
---
-----
--
-·-
--
--
--
----
---
17
SPECIFICATIONS
-----------------------------------------
----
------
18
From the Library of Superior Sewing Machine & Supply LLC
PARTS
CATA
L
OG
I. Ann bed its accessories
---------------------------------------------
---
19
2.
Thread tension regulator mechanism
-----------------------------------------------------------
21
3.
Ann shaft mechanism
---
----------------------------
---
------------------
24
4.
Upper shaft & presser foot mechanism
--
;-
---------------------
----
-------------
26
5.
Needle bar & thread take-up lever mechanism
------------------------------------------------
29
6.
Stitch regulator mechanism
------------------------------------------------
---
--
32
7.
Lower shaft & feed rock shaft mechanism
---
----
---------------------------
34
8.
Hook saddle mechanism
------------------------------------------------,---------------------
37
9.
Knife mechanism ( I ) -------------------------------------------
10.
Knife mechanism
(II)
--------------------------------
------------
39
--
41
11
. Touch back mechanism & detector mechanism
----
--
-----------
-
--
-
---
--
-----------------
----
44
12.
Accessories
-----------
-- -------------------------------------------------
46
GAUGE
PARTS
LIAT
---------------------------
48
From the Library of Superior Sewing Machine & Supply LLC
PRECAUTIONS BEFORE STARTING 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.
2) Power must be turned
off
when the machine
is
not used,
or
when the operator leaves his/her seat.
3) The power must be turned
off
before tilting the machine head, installing
or
removing the
"V"
belt,
adjusting the machine,
or
when replacing.
4) Avoid placing fingers, hairs, bars etc. near the pulley,
"V"
belt, bobbin winder pulley, or motor
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.
6)
If
a belt cover, finger guard, and/or eye guard are installed,
do
not operate the machine without
these safety devices:
2.
Precaution before Starting Operation
I)
If
the machine's oil pan has an oil sump, never operate the machine before filling
it.
2)
Ifthe machine
is
lubricated by a drop oiler, never operate the machine before lubricating.
3) When a new sewing machine
is
first turned on, verify the rotational direction
of
the pulley with
the power on. (the pulley should rotate counterclockwise when viewed from the pulley.)
4)
Verify the voltage and (single or three) phase with those given on the motor nameplate.
3. Precaution for Operating Conditions
I) Avoid using the machine at abnormally high temperature (35°C
or
higher)
or
low temperature (5
°
Cor
lower). Otherwise, machine failure may result.
2) Avoid using the machine
in
dusty conditions.
3) Avoid using the machine in areas where too much electrical noise, resulted from the
high-frequency welder and others,
is
generated.
-1-
From the Library of Superior Sewing Machine & Supply LLC
PREPARATION
FOR
OPERATION
~-----------------------------,
overall view
of
assembled
sewing machine
1.. Power cable connection
1)
Connection to Power Supply
Operation
Power
push
button
X-type servo
motor
Control
box
When connecting the
power
supply connector to the control box, the connector should be completely
plugged in the proper receptacle after confirming the connector type and matching direction.
A.
In
case
of
three-phase electrical power system, the
"IJ"
phase should be connected to the red lead,
the
"V
" phase
to
the white lead, and the "
W"
phase to the black lead.
The
motor rotary direction
depends,
how
eve
r,
upon the setting
of
the internal switch in the control box as described
in
Paragraph 1-(3)
CAUTION:
The
green wire must be connected to the ground terminal
in
order to ground
the motor properly.
B. The appropriate power fuse capacity
is
as follows. Power supply
200V
-24
0V
: I0A
I00V-120V: 15/\
2) Lamp Leads
A. When installing the illuminating lamp(6V,15-20W),
Thc
connecting wire is attached on the back
of
the Control box.
It
should be
removed and connected by
removing the insulating tube
from the wire and stripping
properly.
The
wire connections
should be, then, insulated by
wrapping insulating tape on
the wires.
(
a)
Bare
wire
Lamp
leads
- 2 -
(b)
Insulating
tape
(2
to
3
turns
wrapped)
lns~ating
tape
(2
to
3
turns
wrapped)
Lamp
leads
From the Library of Superior Sewing Machine & Supply LLC
CAUTION: The power switch must be Turned
off
before connecting the lamp.
B. When the illuminating lamp
is
not used, the end
of
the lamp leads must be insulated as (a)
or
(b)
as
shown
in
the figure
on
right side.
If
a short circuit occurs failing to insulate, the transformer in the
control box will be possibly burned out.
CAUTION: The illuminating lamp must not be connected with any heater, such
as
a foot
warmer and others,
in
parallel. Otherwise, the load capacity will be exceeded.
It
may cause transformer winding burned out.
3) Rotary direction
It
is
possible to change the rotary direction
of
the motor by removing the rubber cap
from
the
bottom left side
of
the front cover on the control box; and push the internal direction selector
switch. The built-in lamp in the internal switch
is
off
when the motor
is
rotating counterclockwise as
facing to the motor pulley, and on when rotating clockwise. The rotary direction has been set to
counterclockwise as facing to the motor pulley, matching with the machine prior to shipping
2. Connection
of
control box
The control box should be connected
as shown to the right.
Note: (1) Be sure to turn the powerswih
off
for safety before connecting
or disconnecting the connectors.
(2) The combination
of
the machine
heads with the motor control
panels are specified below.
Use special care for the correct
Operation
box
Round
hole
In
table
combination when replacing the machine head or motor control panel.
3. Adjustment
of
needle bar stop position
1) Adjust
of
"UP"
position
When the pedal
is
kicked down by heel, the
machine stops at
"UP"
position. Ifthe marks
deviate larger than 3 mm, adjust as follows.
a) Disconnect the plug (12 pins)
of
cable from
the machine head.
b)
Run
the machine and stop at
"UP"
position.
c) While holding the pulley, insert the "adjusting
tool"
in
the hole" A", then remove the tool.
-3-
while mark "
UP
"positi
on
Black
mark
"DOWN"positi
on
From the Library of Superior Sewing Machine & Supply LLC
2) Adjust
of
"Down" position
When
the
pedal
is
"Neutral" the machine stops
at
"Down" position. Ifthe marks deviate
large
than 5
mm,
adjust
as
follows.
a)
Disconnect
the
plug (
12
pins)
of
cable
from
the
machine
head
b)
Run
the
machine
and
stop at "Down" position.
c)
While
holding
the
pulley, insert the "adjusting
tool"
in
the hole "B", then remove the tool.
3) Confirm the stop operation, then set the plug (
12
pings) coming
from
the machine
head
into
the
receptacle.
CAUTIONS ON USE
1.
Oiling (1)
Filling
the
oil
to
the
fount.
Oil
level
should
be
periodically checked. Ifoil
level
is
little,Please replenish
oil
to
enough
For oil, Use white spindle
oill.
2. Oiling (2)
When
a
new
sewing machine
is
used
for
the
first
time,
or sewing machine left out
of
use
for
considerably long time
is
used
again, replenish a suitable amount
of
oil
to
the portions indicated
by
arrow
in
the
below figure
----~
------
- 4 -
.I
From the Library of Superior Sewing Machine & Supply LLC
3.
Oiling condition
See dripping
of
oil through the oil sight
hole to check oiling condition during
operation.
4. Adjustment
of
oiling to rotating hook
5.
Cautions on operation
a) When the power
is
turned
on
or
off, keep
foot away from the pedal.
b)
It
should be noted that the brake may not
work when the power is interrupted
or
power
failure occurs during sewing machine operation.
c) Since dust
in
the control box might cause
--·--
malfunction
or
control troubles, be sure to keep the control box cover close during operation.
d) Do not apply a multimeter to the control circuit for checking; otherwise voltage
of
multimeter
might damage semiconductor components in the circuit.
OPERATION
1. Installation
of
needles
Note: Before installing the needles, be sureto turn
off
the power.
Double
Needle
lnutl
lh•
1111cl1
upto
lhl
bollllm
of
nNclt
clamp
and
ti~
~nlllfficieri
lhl
1crew
kNping
lhl
long
grow
tide
of
n1tdll
flee
ID
flee
111Nr1lon
I
0
Long
gro1111e
tide
X
- 5 -
Needle
dillarled
Sil'lle
Needle
I
!O
I
Long
groove
leftlide
ICl9W
Nul
From the Library of Superior Sewing Machine & Supply LLC
2. Winding
of
bobbin thread
Note: When bobbin thread
is
wound, keep the presser foot lifted.
Adjustment:
3. Selection
of
thread
It
is recommended
to
use
"S"
twist thread in the
left needle (viewed from front), and
"Z'
twist
thread in the right needle. When discriminate
use
of
needle threads is impossible, use
"Z"
twist
thread in both the needles.
For bobbin thread,
"S"
twist thread
as
well as "
Z"
twist thread can be used.
4. Threading
of
needle threads
a) Pass each needle thread through thread guide A
Note: When thin slippery thread (polyester Thread
or
filament thread, for example) is used pass the
thread through thread guide B
as
well.
b) With the take-up lever located at the upper most position,
pass each needle thread in the order shown
in
the
following figure.
Note; Pressing the upper thread loosening button shown in the figure
below
opens the
saucer
of
the
upper
thread tension adjuster, and the upper thread can easil) pulled out.
- 6 -
From the Library of Superior Sewing Machine & Supply LLC
uJI1, -
CiHIIII
GC20698-
1
GC20698-
2
5. Adjustment
of
feed (stitch) length and stitch reversing (touch back)
Note:
To
make feed (stitch) length smaller, depress the feed reverse lever and set the feed length
setting dial to a desired position
Touch-back button
...
Direction
of
stitching can be reversed by depressing this button.
Stitching goes on in reversed direction while the button is held down, and returns
to
forward
direction when the button is released.
f11d
lenvth
selling
dill
k
~
6. Setting
of
bobbin
a) Pulling out 5.cm thread tail from the bobbin.
b) Hold the bobbin so that the bobbin thread is
would in right direction and put it into the hook.
- 7 -
-
-----
---
From the Library of Superior Sewing Machine & Supply LLC
7. Threading
of
bobbin threads
a) Put the hook into the bobbin case
and press
down
the latch
CD
.
The
thread end should be left on
the bed .
b)While holding the
two
needle threads
by left hand, rotate the hand-wheel
one turn by right hand.
By pulling up the needle threads,
as shown
in
the figure, the bobbin threads
will be lifted. Each combination
of
bobbin
thread and needle thread should be aligned
and led backward.
- 8 -
From the Library of Superior Sewing Machine & Supply LLC
8. Tension adjustment
of
bobbin threads
Tension
adjusting
SOl"8W
10. Needle thread tension
• Needle thread tension should be adjusted in
reference to bobbin thread tension.
•
To
adjust needle thread tension, tum each tension
adjusting nut.
• Needle thread tension can be also adjusted for
special fabric and thread by changing intensity and
movable range
of
slack thread adjusting spring.
11. Adjustment
of
presser foot pressure
Pressure to fabric(s) can be adjusted
by
turning the
pressure adjusting screw.
12. Timing between rotating hook motion and
needle motion
(I)
Set feed length (stitch length) to
"6"
on the feed
setting dial.
(2) When needle is lifted 2.4mm from the lower dead
point, as shown
in
Figure, the following positional
relationship should be maintained.
The upper edge
of
needle eye should be2.3mm
below the hook point.
The hook point should be located at thecenter
of
needle axis.
Gap between the hook point and the side face
of
needle should be 0.0.Smm.
-9-
9.
Balance
of
thread tension
Balance
tension
BX
2:::~
I I
1;?
'~ht
neecle orloose
bobbin
tension
C X /
~:;..;?
,
~n
neeae
or
ogn1
bobbin
tension
------
Strang
O
Weak
----
--------9
Pressure
adjusting
~"i-:-
..
~ . ,i><.screw
-.
:._
.....:•.
Gap
betwean
haak
paint
and
upper
edge
af
needle
eye
Needle
lift:
2.4nmfram
needle
lower
dead
paint
Center
af
needleuis
From the Library of Superior Sewing Machine & Supply LLC
• Positioning
of
hook point
(I)
When the needle
is
at DOWN position, the smaller
-Crossed helical gears on the right side and left side
should
be
engaged with the large wheel so that the
"S"
screw
of
the fonner gear comes on the front side,
and that
of
the latter gear on the reverse side.
(2) Tighten each
"S"
screw, where is punched for
set screw, on the hook shaft.
(3) Approximate position
of
hook
"C"
screw
of
hook
should be found close to the needle when the needle
is at DOWN position.
•
To
finely adjust timing between the needle motion and
hook motion, loosen the set screw
of
larger gear
wheel and move the gear wheel
in
its axial direction
within a range from Imm to 2mm.
13. Adjustment
of
feed dog height
Height
offeed
dog and pressure
of
presser foot should
be adjusted for individual fabric(s) with the following
cautions:
• Fabric will be damaged
if
the feed dog extends too high,
or pressure
of
presser foot is too large.
• Even stitch length cannot be assured
if
the feed dog
is
too low or pressure
of
presser foot
is
too small.
• Feed dog height should be measured at the point where
the needle is at the top position.
.
For light fabrics
For usual fabrics
For heavy fabrics
Adjustment procedure
Approx. 0.8mm from throat plate
Approx. 1.0mm from throat plate
Approx. 1.2mm from throat plate
a) Lean the machine head backward.
b) Tum the hand wheel by hand and stop when the feed
dog rises to the maximum height.
c) Loosen the feed bar set screw.
-
l-2mm
j,@
N1.U.DOWN
poeition
-
1-2mm
0.
8mm
Imm
d) Vertically move the feed bar (in the direction indicated
by
arrow
in
the figure) to adjust
it
to
adequate height.
-
IO-
From the Library of Superior Sewing Machine & Supply LLC
e) After the adjustment, tighten the feed bar set screw.
• The feed ~og height is factory-adjusted to t.2mm
14. 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) Tum the balance wheel and stop when the take-up
lever is lifted
to
its upper dead point.
b) Lean the machine head backward and make sure the
arrow (timing mark) put on the timing belt is in
line with the black line on the boss
of
lower shaft bearing.
Timing
belt
sprocket
c)
If
the timing mark is not in line with the black line ,remove the timing belt and install it again to
adjust.
15. Relationship between hook motion
and openermotion
a) Tum the balance wheel by hand and stop when
the opener holder is located most remotely from
the throat plate.
b) Make sure gap between the bobbin case holderA
and the opener
is
approximately 0.2mm.
c)
If
the gap is too large
or
small , loosen the opener
holder setscrew
Band
adjust position
of
the opener.
b) Lean the machine head backward.
c) Loosen the feed
Ii
fti
ng rock shaft crank set screwsA
and B.
d) Set the needle at the lowest position.
e) Adjust the distance between presser rod and vibration
prevention rod to 9mm and temporarily tighten the feed
lifting rock shaft crank set screws A and B
f)
Check that the right feed lifting rock shaft crank is
connected with the link at right angle, as shown in
Figure.
-
11
-
App-ax.
0.2mm
A
Opener
Scl'IIW
Opener
hdder
From the Library of Superior Sewing Machine & Supply LLC
g)
If
the connection
is
not at right angle, remove the back
cover, loosen screw C and move the right link to connect
the right feed lifting rock shaft with the link at right angle.
h) After the completion
of
adjustment, fully tighten the
screws
A,
Band
C.
• At this time make certain that needle can enter the
feed dog needle hole at the center
of
the hole.
I
I
I
-,--l""T"-==---
17. Safety clutch device:
Needle rod
Vibration
prevention
rod
Safety clutch device
is
installed to prevent the hook
and cog belt from damage
in
case the thread
is
caught into the hook when the machine
is
loaded
abnormally during operation.
(1) Function
of
safety clutch.
a) When the safety clutch acts, the cog belt pulley will be
unloaded. then the rotation
of
hook shaft will stop.
The arm shaft only will rotate. Stop the operation
of
machine.
Feed
lifting
rock
shaft
crank
(righl)
b) Clean the thread thoroughly which
is
caught into the hook.
c) Turn the cog belt hub by hand, and check whether the hook
Shaft rotates lightly and properly, place the clutch device as
follows.
-
12
-
.I
From the Library of Superior Sewing Machine & Supply LLC
(2)
How
to
set the safety clutch.
a) While pressing down the push button on the
opposite side
of
bed by left hand, tum the
balance wheel slowly by right hand away
from you
as
shown
in
the figure.
b) The balance wheel will stop by the gear plate,
but
tum
the balance wheel more finnly.
c) Release the push button.
d) As shown in the Figure, the safety clutch device
is set.
(3)
Force applied
to
the safety clutch.
18.
a) The force applied to the safety clutch
is
the
smallest when the white mark
of
the eccentric
pin faces the center
of
the lower shaft. The
force proportionally increases as the white mark
faces the outside.
b) To adjust the force slide the timing belt, loosen
the set screw, and tum the eccentric pin.
White
mark
TmingBett
Eccentric
Pin
·
strengthen
Sat
Screw
Low
Shaft
Eccentric
Pin
c) After the adjustment, make sure to fasten the set screw.
Upper feed adjustment
Horizontal
lhaft
c:rank,right
(Needle side)
If
the uneven feeding occurs according to the fabric,
adjust the long hole
of
the horizontal feed sha
ft
crank (right) to adjust the upper feed length.
(How to adjust)
a) Loosen the special bolt.
b)
Move the special bolt upward to decrease upper feed.
c) Move the special bolt downward to increase the upper feed.
The
upper feed and the lower feed
theoretically becomes equal at the reference line on the_horizontal feed shaft crank.
d) Securely tighten the special bolt after adjustment.
-
13
-
From the Library of Superior Sewing Machine & Supply LLC
19. Outside presser foot and inside presservertical stroke adjustment
When fabric with large elasticity
is
sewn, or when
thickness
of
fabric changes, the vertical stroke
(movable range)
of
the presser feet should be
adjusted as follows:
Adjustment
a) Loosen the special bolt.
b) The vertical strokes
of
the presserfeet become
c) maximum when the crank rod
is
moved upward and set.
d) The vertical strokes becomes minimum when the nut
is
moved downward and set.
e) After the adjustment, fully tighten the special bolt.
Specillbol
• The verticaistrokes
of
the presser feet can be adjusted within a range from 6mm to 2mm.
20. Adjustment
Screwing the pin that connects the link
of
back-sewing with the crank
of
back-sewing (down) can adjust
the tolerance
of
between the stitches. Screwing the pin
in
clockwise can increase the stitch
of
forward
sewing; otherwise, the stitch
of
back-sewing
will
be increased.
21. Installation
of
movable knife
(1)
Installation
of
movable knife
a.
Tum the balance wheel and lower the needle bar to the lowest position.
b.
Push the cam follower crank so that the cam roller enters into the thread trimmer cam groove.
c.
Tum the balance wheel until the black mark point on the arm meets the white mark point on the
balance wheel. Set the cam follower crank at this position with a screwdriver temporarily preventing
the cam roller coming out from the cam groove.
d.
Loosen the thread trimmer rocking crank clamp bolts A and
B.
e.
Adjust the movable knife so that the movable knife end slant portion protrudes
0-0.5
mm
from the fixed knife, as shown
in
Figure and tighten the bolts A and
B.
-
14
-
From the Library of Superior Sewing Machine & Supply LLC
Thread
trimmer
~a_.--r~
rocking crank
(2)
Gap between movable knife and bobbin case holder stopper
a. Tum the balance wheel by hand until needle reaches the
Lowest position.
b. With the needle at the lowest position, depress cam follower
crank,
tum
the balance wheel until the movable knife reaches
the extremity
of
its stroke.
c. Manually rotate the inner hook
in
the direction indicated
by
arrow in Figure and adjust gap between the movable knife
Monable
knife
--.i1~-Approx
0.2
mm
and the inner hook stopper to about 0.5 mm (the screws A and B should
be
loosened for this adjustment).
22.
Adjustment
of
thread trimmer
cam
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.
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.
• To adjust, loosen two thread trimmer cam clamp screws
A.
Cam
follower
Thread
trimmer
cam
15
-
Green
mark
point
Black
mark
point
From the Library of Superior Sewing Machine & Supply LLC
23.
Adjustment
of
needle threads tension release assembly
a. Tum 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.
c. Turning the balance wheel
by
hand, adjust the thread tension release cam so that the
~nsion
disc close
when the white mark point on the balance wheel comes in line with the black mark point on the arm.
To
adjust, loosen two tension release cam clamp screws A.
d.
Opening degree
of
tension disc should be adjusted with the tension release roller B mounted on the
convex portion
of
thread release cam, as shown
in
Fig.To adjust, loosen the screws C and draw the wire.
e. Make fine adjustment by loosening the nut
D.
f.
Loosen the nut D and make the outer casing approach rightward to increase the opening value.
Thread
tenson
lever
'-....
I
Thread
trimmer
cam
ScrewC
CID
White
perk point
Cam
follower
Nut
D
24.
Adjustment
of
scissoring pressure
of
movable knife and fixed knife
a. Loosen the fixed knife bracket clamp bolt A.
b.
Turn the vertical position adjusting screw B to adjust meshing pressure and then righter the hexagon
socket head cap screw A.
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.
Fixed
kn
i
fe
bracker
Hexacon
socket
head
cap
screw
A
Vertical
posit
i
on
adjustinc
screw
B
-
16
-
From the Library of Superior Sewing Machine & Supply LLC
25.
Sharpening
of
fixed knife
When the knives dull, the fixed should
be sharpened as illustrated in Fig.
Since
it
is
very difficult to sharpen the movable knife,
replace
it
with a new one when it dulls.
26.
Adjustment for change
of
neecile-to-needle distance
(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
J.
(4) Remove the spring
M.
(5) Loosen the hook bracket
clamp screws A and B and
adjust gap between each
needle and hook.
Connecting
link
Screw A
Cam follower
crank
(6) When the needles and
hooks have been adjusted,
install the spring
M.
Bolt J Stopp r
--
Thread trimmer
cam
(7) Contact the rocking cranks
pin F Thread trimmer
rockmi:i crank D
$crew
B
C and D to the stopper pins E and F and tighten the connecting link clamp bolt
J.
(8) Turn the balance wheel by band until the needles reach the lowest position.
(9) Loosen the nuts G and
H.
(
10)
Depress the cam follower crank K and adjust the connecting rod L so that the cam roller can
smoothly enter the groove
of
thread trimmer cam.
(11) Adjustment
of
the cam groove and the cam roller
i.
Push the cam follower crank K so that the cam roller enters into the cam groove.
ii.
Turn the connecting rod
Land
adjust the clearance between the cam roller and the cam
groove surface L as small as possible, and tighten the nuts G and H.
iii. Push the cam follower crank K again and check that the cam roller enters into the thread
trimmer cam groove smoothly.
-
17
-
From the Library of Superior Sewing Machine & Supply LLC
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