HIGHLEAD GC0318-2A User manual
HIGH
LEAD
GC0318-2A/GC0318-2H/GC0318-2B/
GC0318-2AD
TOP
AND BOTTOM FEED
LOCKSTITCH
SEWING MACHINE
Instruction Manual
Parts Catalog
SHANGHAI HUIGONG
N0.3
SEWING MACHINE FACTORY
From the library of: Superior Sewing Machine & Supply LLC
From the library of: Superior Sewing Machine & Supply LLC
CONTENTS
l.Instruction
Manual
1.
MAIN SPECIFICATIONS · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
....
· ·
.......
2
2.
INSTALL THE MOTOR · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · . 2
3.
CONNECT THE CLUTCH LEVER WITH THE PEDAL · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
·.
2
4.
PREPARATION AND LUBRICATION
.·
· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
·3
5.
REPLACE
NEEDLES············································
...
···
.................
3
6.
NEEDLE, THREAD AND MATERIAL TO BE SEWN · · · · · · · · · · · · · · · · · · · · · · · · · ·
...............
4
7.
RUN-IN
OPERATION······························································
....
·4
8.
THREADING····································································
.....
·5
9.
WINDING ADJUSTMENT · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · . · ·
........
6
10.
SET STITCH LENGTH AND REVERSE FEEDING · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
.......
7
11.
POSITION PRESSER BAR · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
................
7
12.
ADJUST THE PRESSURE OF PRESSER BOOT · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
.....
·8
13.
ADJUST THREAD TENSION · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
...............
·8
14.
ADJUST THREAD TAKE-UP SPRING · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
..........
9
15.
ADJUST THREAD GUIDE AND THREAD TENSION · · · · · · · · · · ·
..
· · · · · ·
..
· · · · · ·
..
· · · · · ·
..
· ·
·10
16.
TIME NEEDLE
TO
ROTAING
HOOK··
............
···
........
·······
..
······
..
·
..
·
.......
11
17.
REPLACE ROTATING HOOK · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
12
18.
ADJUST THE HEIGHT OF FEED DOG · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
·12
19.
ADJUST THE POSITION OF FEED
DOG·
..··
....
··..
······
..
·
..
·
....
·
..
···
..
·
....
·
......
·13
20.
TIME FEED MOTION TO NEEDLE M.OTION · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·13
21.
ADJUST OPENING TIME OF THE TENSION DISCS
....
· · · · ·
..
·
..
·
..
· · ·
....
·
..
·
............
14
22.
LUBRICATION
ADJUSTMENT·························································
·15
23.
REGULAEANING · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·16
24.
ADJUSTMENT OF THREAD TRIMMER MECHANISM · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
17
2.Parts Catalog
A.
ARM BED AND
ITS
ACCESSORIES······················································
·18
B.
NEEDLE BAR AND TAKE-UP, ARM SHAFT AND VERTICAL SHAFT MECHANISM · · · · · · · · · · · ·
·21
C.
STITCH REGULATOR MECHANISM · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
·25
D.
FEEDING AND FEED LIFTING MECHANISM · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·28
E.
PRESSER FOOT MECHANISM · · · · · · · · · · · · · · · · · · · · · · · · · ·.· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·30
F.
PRESSER LIFTING, FEEDING MECHANISM · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 32
G.
LUBRICATION MECHANISM · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·35
H.
THREAD TRIMMER MECHANISM · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·37
I. TOUCH BACK MECHANISM & DETECTOR MECHANISM · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·40
J.
OIL RESERVOIR AND OTHERACCESSORIES · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
42
-I-
From the library of: Superior Sewing Machine & Supply LLC
1. MAIN SPECIFICATIONS
Item GC0318-2A GC0318-2H GC0318-2B
GC0318-2AD
Max. sewing speed Cspm) 2000 2000 2000 2000
Needle
t:l t:l t:l
t:l t:l
t:l
DPX
17
18
-22
DPX5 14 DPX
17
25
DPX
17 18
-22
Needle bar stroke Cmm) 35 35 35 35
Lubrication Automatic Automatic Automatic Automatic
Stitch length (
mm)
0-10
0-4
0-10
0-8
Presser fool
by
hand Cmm) 6 6 6 6
lift
by
knee Cmm)
13
13
13
13
2.INSTALL
THE
MOTOR
( Fig.l )
Align Motor Pulley Groove ( B ) and Balance Wheel Groove ( A ) by moving the motor leftward or
rightward.
L-----C
Fig. 1
5I
:=j_gft
[[j
x+-+
3. CONNECT
THE
CLUTCH
LEVER
WITH
THE
PEDAL ( Fig.2 )
1) The optimum tilt angle
of
pedal
(A
) is approximately
15
deg.
2) Adjust Clutch Cover ( D ) so that Clutch-Lever ( C ) and Draw Bar ( B ) run in line.
3)
The balance wheel should rotate counter-clockwise when viewed from the outside
of
Balance Wheel
(G).
The direction
of
the motor pulley rotation can be reversed by reversing
(turning
over 180 deg
.)
the power
plug
of
the motor.
4) Adjust the tension
ofV-belt
(F)
by
turning Motor Vertical Position Screw ( E
).
The proper tension
of
the V-belt
is
a slack
of
10-20mm when the belt
is
depressed at
the center
of
the belt by finger.
Fig.2
-2-
G
F I I
E
D
c
B
A X
From the library of: Superior Sewing Machine & Supply LLC
4-.
Adjustment
of
needle
bar
stop position(Fig3):
1) Adjustment
of
"UP" position
When the pedal
is
kicked down by heel to cut the thread, the machine stops
in
the "UP" position.
If
the
marks deviate more than 3mm, adjust as follows:
C
1)
Disconnect the plug (12 pins) from the control panel;
(
2)
Run the machine and stop in the "UP" position;
(
3)
While holding the pulley, insert the adjusting tool into the two holes marked "A", then rotate the pulley.
2)
Adjustment
of
"DOWN" position
When the pedal
is
returned to the neutral position, the machine stops in the "DOWN" position.
If
the
marks deviate more than 3mm, adjust as follows:
(
1)
Disconnect the plug (12 pins) from the control panel;
(
2)
Run the machine and stop in the "DOWN" position;
(
3)
While holding the pulley, insert the adjusting tool into the two holes marked "B", then rotate the pulley.
3)
Confirm the stop operation then the plug (12 pins) coming from the machine head into the receptacle.
Mark (Black)
3rd Mark
Fig.3
5.
PREPARATIONAND LUBRICATION (
Fig.4)
1)
Cleaning the machine
Before leaving the factory, the machine parts are coated with rust-preventive grease, which may be
hardened and contaminated by dust during storage and shipment. This grease must be removed with gasoline.
2)
Examination
Though every machine
is
confirmed by strict inspection and test before leaving the factory, the machine
parts may be loose or deformed after long distance transportation with jolt. A thorough examination must be
performed after cleaning the machine. Turn the balance wheel to see
if
there
is
running obstruction, parts
collision, uneven resistance or abnormal noise.
If
these exist, adjustment must be made accordingly before run-in
operation.
-3-
From the library of: Superior Sewing Machine & Supply LLC
3) Oiling
(
1)
Required amount
of
oil.
Line (
A)
on the oil reservoir: Max. oil level.
Line ( B ) on the oil reservoir: Min. oil level.
Tf
oil level goes down under line ( B ),
oil cannot be distributed to each part
of
the machine,
thus causing the parts a seizure.
(2) Replenishing
Always use only
No.l8
special machine oil
I
I
for high speed sewing. Be sure to replenish oil to A 8 C
Line ( A ) before starting operation.
(3) Replacing oil
Fig.
4
To
replace oil, remove Screw ( C ) to drain oil. After completely draining
off
oil, clean the oil reservoir and
securely tighten Screw
(C),
then fill the reservoir with fresh oil.
6.
REPLACE NEEDLES (
Fig.5)
Turn the balance wheel to lift needle
bar
to the upper end
of
its stroke. Loosen Needle Clamp Screw
1.
While keeping the long groove
of
the needle leftward fully insert the needle shank up to the bottom
of
the needle
socket. Then tighten Needle Clamp Screw
A.
Note: Fig. ( b
):
insufficient insertion.
Fig.
(c):
\\-Tong
direction
oflong
groove.
Long groove
Fig.5
7.
RUN-IN OPERATION
(Fig.
6)
Run-in operation is required for a new sewing machine, or a sewing machine left out operation for
::.
considerable length
of
time.
1)
Remove Red Rubber Plugs (
A)
on the top
of
the arm and replenish sufficient amount
of
oil.
2) Lift Presser Foot ( B
).
3) Run the machine at a
low
speed ( 2000-2500spm) to check oil distributing condition through Oil Check
Window
(C).
-4-·
From the library of: Superior Sewing Machine & Supply LLC
4) Perform run-in operation at 2000-2500spm for 30rninutes. After a lapse
of
one month
of
service during
which the working speed is increased gradually and the machine runs sufficiently well, the high speed 5000spm
can
be
adopted according
to
the nature
of
the
work
Fig.6
8.
THREADING
( Fig.7 )
To
thread the needle thread, raise needle
bar
to
the upper end
of
its stroke, lead the thread from spool and
perform threading as shown in Fig.7 .
To
draw the bobbin thread, hold the end
of
the needle thread and turn the
balance wheel
to
lower the needle
bar
and then to lift
it
to its highest position. Pull the needle thread and the
bobbin thread is drawn
up.
Put the ends
of
needle thread and bobbin thread frontward under presser
foot.
Fig. 7
-5-
From the library of: Superior Sewing Machine & Supply LLC
9.
WINDINGADJUSTMENT (
Fig.8)
1)
The wound bobbin thread should be neat and tight,
if
not, adjust the winding tension by turning Tension
Stud Nut
(A)
of
bobbin winder tension bracket.
Note: nylon or polyester thread should be wound with little tension, otherwise, Bobbin ( D ) might break or
deform.
2)
When the wound thread layer does not present a cylindrical shape
as
shown
in
Fig.7 (
a),
loosen Set
Screw ( B )
of
bobbin winder tension bracket and slide Bracket ( C ) leftward or rightward.
If
thread is wound
as
shown in Fig.7
(b),
move the bracket rightward, but
if
thread is wound
as
shown in Fig.7
(c),
move the bracket
leftward.
After adequately positioning the bracket, tighten Set Screw ( B
).
3)
Do
not overfill the bobbin. The optimum length
of
thread will fill about 80%
of
bobbin capacity. This can be
adjusted by Adjusting Screw
(E)
of
bobbin winder stop latch.
a b c d
Fig.8
-6-.
From the library of: Superior Sewing Machine & Supply LLC
10.
SET STITCH LENGTHAND REVERSE FEEDING (
Fig.9)
1)
Stitch length can be set by turning Dial
(A).
2)
The
figures
on
Face
(B)
of
dial show stitch length intmn.
3)
Reverse feeding starts when Reverse Feed Lever ( C )
is
depressed, and the machine will feed forward
again
if
Reverse Feed lever
(C)
is
released.
.---------------------------------~
Fig.9
ll.POSITION
PRESSER BAR ( Fig.lO)
1)
Loosen lock Nut ( E ) and Pressure Regulating Thumb Screw ( A ).
2)
Remove rubber plug from Face Plate
(B).
3) Loosen Screw ( C ) and adjust the position
of
Presser Bar ( D ) till the presser foot is 6 mm above the
throat plate will the presser foot lifted
to
its highest.
4)
Tighten Screw
(C)
and put in the rubber plug.
5)
Tighten pressure Regulating Thumb Screw
(A)
and Lock Nut ( E
).
Fig.
10
-7-
From the library of: Superior Sewing Machine & Supply LLC
12.
ADJUST
THE
PRESSURE
OF
PRESSER EOOT ( Fig.11 )
Pressure
of
presser foot is to be adjust in accordance with thickness
of
materials to be sewn.
First loosen Lock Nut (
A).
For heavy materials, turn the pressure regulating thumb screw as shown in
Fig.1 0
(a)
to
increase the pressure, while for light materials, turn the pressure regulating thumb screw
as
shown
in Fig.l0 ( b ) to decrease the pressure. Then tighten Lock Nut
(A).
The
pressure
of
presser foot is recommended to be less
as
long as normal feeding is ensured.
Fig.
11
a b
13.
ADJUST THREAD TENSION ( Fig.1Z,13)
In
principle, thread tension is
to
be adjusted in accordance with materials, thread and other factors.
In
practice, thread tension is adjusted according to the stitches obtained. The needle thread tension should
be adjusted with reference to the bobbin thread tension. Tum Tension Spring Regulating Screw (
A)
of
bobbin
case clockwise for more tension, or turn the screw counter-clockwise for less tension.
It
is
common practice to test the bobbin test the bobbin thread tension as shown in Fig.l3 . Hold the end
of
the thread from delivery eye.
If
the bobbin case is falling slowly, the proper tension is obtained. The needle
thread tension can be adjusted by setting ( 1 ) the take-up spring tension. ( 2 ) the thread take-up spring stroke
and ( 3 ) tension spring. All these adjustments will be described in the following.
r-------~--------------------~
Fig.
12
Fig.
13
--8--
From the library of: Superior Sewing Machine & Supply LLC
14.
ADJUST THREAD TAKE-UP SPRING (
Fig.l4,15)
1)
Adjusting the thread take-up spring tension
Loosen Set Screw ( A ), turn Tension Stud ( B ) clockwise to increase the spring tension, or turn the stud
counter-clockwise to decrease the spring tension. After the adjustment, be sure to tighten Set Screw (
A).
The
thread take-up spring tension should be about 30g.
To
Attain this. First loosen Set Screw
(A),
turn Tension Stud
( B ) counter-clockwise to decrease the tension
of
Thread Take-up Spring ( C ) to zero, then turn Tension Stud
(B)
clockwise until Spring
(C)
comes to the notch
of
thread tension regulating bushing, and again turn Tension
Stud ( B ) halfway back ( cmmterclockwise ) After the adjustment. Tighten Set Screw
(A).
Fig.
14
2)
Adjusting the thread take-up spring stroke
Loosen Set Screw ( B ), turn Stud ( C ) clockwise to increase the stroke or turn Stud ( C )
counter-clockwise to decrease the stroke. After the adjustment, tighten Set Screw
(B).
Before leaving the factory, the thread take-up spring has properly been adjusted. Readjustment
is
needed
only
in the case
of
special material or special thread.
.-----~------------------------------.
,-----------(
A
Fig.
15
-9-
From the library of: Superior Sewing Machine & Supply LLC
15.
ADJUST THREAD GUIDE AND THREAD TENSION ( Fig.16,17)
The position
of
the thread guide affects stitch tightness and therefore must be adjusted according to sewing
materials and sewing conditions.
1 2 3
Thread guide position Leftward Center Rightward
Material weight Heavy Medimn Light
Figl5 shows different stitch fonns. Normal stitch fonn should be
as
sho\\<n
in
Fig.l5 ( a
).
When abnormal stitches cause puckering
and thread break-age, the tension
of
needle thread and bobbin
thread must be adjusted accordingly. Fig.
16
a
b
c
d
e
l)
In
case needle thread tension is too strong or bobbin thread tension is too weak, as shown in Fig.l5 ( b ), tum
the thumb nut counterclockwise to decrease the needle thread tension, or tighten the tension spring regulating
screw ofbobbin case
to
increase the bobbin thread tension ( See Fig.l6 )
2)
In
case needle thread tension is too weak or bobbin thread tension is too strong,
as
shown in Fig.l5 ( c
),
tum
the
thumb nut clockwise to increase the needle thread tension, or loosen the tension spring regulating screw
of
bobbin case
to
decrease the bobbin thread tension.
3)
In
case of the stitch forms
as
shown in Fig.l5 ( d )
and
( e
),
adjustments can be made with reference to the
above means.
c
Fig.
17
-10-
From the library of: Superior Sewing Machine & Supply LLC
16.
TIME
NEEDLE
TO
ROTAING
HOOK
( Fig.18,19,20,21 )
A.
Adjusting the needle position ( See
Fig.
IS
)
I)
Turn
balance wheel by hand to bringNeedle Bar ( C )
to
the lowest position
of
its stroke.
2)
Remove rubber plug from Face Plate
(A).
3) Loosen Set Screw
(B)
of
needle
bar
adaptor.
4) Move Needle Bar
(C)
vertically
to
adjust needle
timing.
5)
After
the
adjustment, tighten Set Screw ( B ) and put in the rubber plug. The standard needle timing ( See
Fig.
IS
)
is
to
align Timing Mark ( B ) on the needle bar and the bottom
of
Needle Bar Bushing ( A ) and
meanwhile align the Inner Surface
(E)
of
the hook and the center
of
Needle Eye
(D)
when the needle bar gets
down
to
its
lowest position.
Fig.
18
B.
Adjusting the hook point timing
Fig.
19
Timing
of
needle motion to rotating hook motion has a great effect on sewing performance. The standard
hook point timing
(See
Fig.20)
is
to align Hook Point
(D)
and Needle Centerline
(C)
when Needle Bar
(B)
is
lifted by 2.2nnn from the lower end
of
its stroke. Besides, Hook Point
(D)
should be l.0-1.5nnn above the
upper
end
of
needle eye
(E).
When adjusting the hook point timing, also notice that the clearance between the bottom
of
needle notch
and Hook Point ( C ) should
be
approx.
0.
05nnn ( See Fig.21 )
Fig.20
00
21
-
11-
From the library of: Superior Sewing Machine & Supply LLC
17.
REPLACE ROTATING
HOOK
( Fig.22)
1) Lift needle bar to the highest position
of
its stroke.
2) Remove throat plate, take down needle and bobbin case.
3) Loosen Screw ( C )
of
hook positioner and take down Hook Positioner
(A
).
4) Loosen two Screws ( D )
of
rotating hook
5) Tum balance wheel to raise feed bar
to
its highest position, then take down the rotating hook by turning it
away from feed bar.
6) Installing the hook can be done in reverse sequence. Note that Needle ( B ) and the convex surface
of
Hook Positioner
(A)
should align with a clearance of0.5-0.7mm between them.
0.
5-0.
7mm
Fig.22
18.
ADJUST THE
HEIGHT
OF
FEED DOG ( Fig.23,24)
1) Tum balance wheel until feed dog is lifted to its highest position from throat plate surface.
2)
Loosen Screw
(A)
offeed lifting rock shaft crank right
(See
Fig.23,b)
3) Move Feed Bar ( B ) in the direction shown by the arrow in Fig.
23
( a )
to
adjust the height
of
the feed
dog.
The standard height
of
feed dog is that the top
of
feed dog is
lmm
above Throat Plate Surface ( B
).
4) After the adjustment, be sure to tighten Screw
(A).
Fig.23 Fig.24
-12-
From the library of: Superior Sewing Machine & Supply LLC
19.
Adjustment offeed dog inclination (Fig.25,26):
Ifnecessary, adjust the inclination according to the material to be sewn
as
follows:
Eccentric
shaft
Fig.
25
I) Loosen the screw "A".
2) Rotate the eccentric shaft clockwise or cmmterclockwise with screw driver.
3) Tighten the screw "A".
Position of mark on the Feed dog
eccentric shaft
~-
Horizontal
~
Standard
8)' Up
~
Front up
(MAX.)
8).
Down
~
Front
down
(MAX.)
Fig.26
20.
TIME FEED MOTION
TO
NEEDLE
MOTION
( Fig.27,28,29)
The standard timing
of
feed motion to needle motion is that the top
of
feed Dog ( C ) is flush with Throat
Plate Surface
(B)
when the point
of
Needle
(A)
reaches Throat Plate Surface
(B).
See Fig.27.
Fig.27 Fig.28
-13-
From the library of: Superior Sewing Machine & Supply LLC
If
feed motion
is
not timed to needle motion, adjust
as
follows
(See
Figs.28 and 29
).
1)
Remove Ann Side Cover .
2) Loosen Set Screws
(A)
and ( D )
of
feed and feed lifting eccentric.
3) Hold Feed and Feed Lifting Eccentric ( B ) and turn Balance Wheel ( E ) slowly until the upper edge
of
Arm Shaft Oil Hole ( C ) aligns with the lower edge
of
Reference Hole ( G )
of
feed and feed lifting
eccentric.
Fig.29
21.
ADJUST OPENING
TIME
OF
THE TENSION DISCS ( Fig.30)
within the presser foot lift range
of
2-7mm opening time
of
the tension discs can be adjusted as follows:
1)
Remove the rubber plug from the back
of
arm and loosen Screw
(A)
of
knee lifter lever ( left
).
2) Move the tension releasing cam leftward for earlier opening or rightward for later opening. It will facilitate
the adjustment to put under the presser foot a block
as
thick as the presser foot lift.
3) After the adjustment, fully tighten Screw
(A).
Fig.30
-14-
From the library of: Superior Sewing Machine & Supply LLC
22.
LUBRICATION ADJUSTMENT ( Fig.31 )
A Adjusting oil pump.
In ordinary operation, adjustment is not required for the oil pump.
If
oil splashing does
not
occur in the oil
check window when the machine runs at a low, speed ( approx.2000spm ), reduce the clearance
of
the by-pass
hole.
B.
Adjusting the lubrication
of
rotating
hook
The lubrication
of
the rotating hook can be adjusted by Oil Adjusting Screw
(A)
as follows:
1) Turn Oil Adjusting Screw ( A ) clockwise to increase oil and
turn
Oil Adjusting Screw ( A )
counterclockwise to decrease oil.
2) Oil Adjusting Screw (
A)
adjusts oil amount within 5 turns.
When
Oil Adjusting Screw (
A)
is fully
tightened, oil amount is maximun1.
3) Readjustment depends on temperature, sev.ring speed and the like. In practice, oil amount
can
be judged
as
follows: remove the throat plate and place a piece
of
paper on instead,
run
the machine for about 20 seconds,
then check the oil splashed on the paper.
A
•
~
(--)
"--"
Fig.31
-15-
From the library of: Superior Sewing Machine & Supply LLC
23. REGULAR CLEANING ( Fig.32,33,34)
1) Cleaning feed dog
(See
Fig.32)
Remove the throat plate and clear
off
the dust and lint between feed dog tooth slots.
Feed
dog
Hook
Feed
bar
Fig.32 Fig.33
2) Cleaning rotating hook
(See
Fig 33 )
Swing out the machine head and clean the hook. Wipe the bobbin case with soft cloth.
3)
Clem1ing
oil pump, screen
(See
Fig.34)
s,ving
out
t..l-te
machine
head
and
clear
off
the
dust
and
di.rt
on
oil
pump
screen.
Screen
Fig.33
-16-
From the library of: Superior Sewing Machine & Supply LLC
24, Adjustment ofthread
trimmer
mechanism:
1)
TI1e
thread trimmer mechanism illustrated as Fig.35.
~----;-]
L~~·_::?
blade
bracket
uni~.J
----
~
--
'"'"'
""'
"L
F1xed
blade
~
/
Movable knife
tiett)
Tw1st
spnng
Tw1st spring
Knife driving /
shaft 1 , Stopper
Cam
follower
crank(l)
Cam
follower Drive lever Stopper plate
crank (2)
C1) Operation stroke
of
the thread trilmner solenoid:
a.
Standard operation stroke is 6.0mm.
Fixed
blade
b.
This stroke can be adjusted
by
usmg nut "A".
2)
Adjustment
of
knife engagement (Fig.36):
Smm
/®
®
C1) Position
of
movable knife (left) and fixed blade:
See the Fig.36, the standard distances from the needle center
are 7.5mm and 5mm from the movable knife (left) and fixed
blade respectively.
(2) Adjustment
of
knife engagement:
With the solenoid activated, turn on the machine. This rotates
the threadtrimming cam which rotates the movable knife (left).
When the movable knife (left)has moved to its farthest distance,
the standard engagement
of
the blade is 1.5mm-2.0mm. The
engagement can
be
adjustedby properly mounting the drive arm.
C3 ) Adjustment
of
knife engagement pressure:
a.
If
a thread is poorly cut, particularly when
it
is thick,
slightly increase the engaging pressure. This should solve the
problem.
b.
The engaging pressure can be adjusted in this way:
Loosen lock nut
"B"
and adjust it
by
using adjustmg screw
"A"
-17-
Knife driving
crank
I.
5-2
.Omm
Fixed
blade
Movable
knife (left)
Movable
knife
(left)
Fixed
blade
Fig.36
From the library of: Superior Sewing Machine & Supply LLC
A.
ARM BED AND ITS ACCESSORIES
5
6
41
42
43
33
29
28 23
36--6
31
27
-18-
26 25
32
24
1
11----44
From the library of: Superior Sewing Machine & Supply LLC
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