HIGHLEAD GC0318-2A User manual
HIGH
LEAD
Purchasing
Dept
Copy
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
CONTENTS
1.Instruction Manual
l. MAIN SPECIFICATIONS · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·2
2.
INSTALL THE MOTOR · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 2
3.
CONNECT THE CLUTCH LEVERWITH 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.
WINDINGADJUSTMENT · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
.6
10. SET STITCH LENGTH AND REVERSE FEEDING
..
·
............
·· ..
·
............
·
..
·
....
·
..
7
11. POSITION PRESSER
BAR
· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·7
12.
ADJUST THE PRESSURE OF PRESSER
EOOT
........
·
..........
·
..
· ·
..........
·
..........
·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
¥0TION
· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
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
-1-
1.
MAIN SPECIFICATIONS
Item GC0318-2A GC0318-2H GC0318-2B
GC0318-2AD
Max. sewing speed Cspm) 2000 2000 2000 2000
Needle Ii Ii Ii Ii Ii Ii
DPX
17
18
-22
DPX5
14
DPX
17
25
DPX
17 18
-22
Needle bar stroke
(mm)
35 35 35 35
Lubrication Automatic Automatic Automatic Automatic
Stitch length
(mm)
0-10
0-4
0-10
0-8
Presser fool by hand
(mm)
6 6 6 6
lift
by
knee
(mm)
13 13
13 13
2.INSTALL THE MOTOR ( Fig.1 )
Align Motor Pulley Groove ( B ) and Balance Wheel Groove ( A ) by moving the motor leftward or
rightward.
'-----C
Fig. 1
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
of
V-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
E
D
c
B
A e
)(
4-..
Adjustment
of
needle bar stop position(Fig3):
I ) 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:
(
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:
(I)
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.
B
1st Mark White
Up
position
3rd
Mark Black
Mark (Black)
3rd
Mark
Fig. 3
5. PREPARATION
AND
LUBRICATION (
Fig.4)
I)
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. Tum 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-
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.
If
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.18 special machine oil
for high speed sewing.
Be
sure
to
replenish oil to
Line ( A ) before starting operation.
I
I
A 8
(3) Replacing oil
Fig.
4
c
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.
x
)(
Long groove a b c
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
a 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-·
4) Perform run-in operation at 2000-2500spm for 30minutes. 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-
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 byAdjusting Screw (
E)
of
bobbin winder stop latch.
A------
8-----
a b c d
Fig.8
-6-
10.
SET STITCH
LENGTH
AND 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 in
mm.
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
11.POSITION PRESSER BAR ( Fig.10)
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 inthe rubber plug.
5) Tighten pressure Regulating Thumb Screw
(A)
and Lock
Nut
( E
).
Fig.
10
-7-
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.
10
(
a)
to
increase the pressure, while for light materials, turn the pressure regulating thumb screw
as
shown
in Fig.10 (
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.lZ,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.13 . 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.
~~-----"--------~~~
+
Fig.
12
Fig.
13
-8-
14.
ADJUST THREAD TAKE-UP SPRING ( Fig.14,15)
1) Adjusting the thread take-up spring tension
Loosen Set Screw ( A ), turn Tension Stud ( B ) clockwise to increase the spring tension, or
tum
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 )
io
zero, then tum Tension Stud
( B ) clockwise until Spring ( C ) comes to the notch
of
thread tension regulating bushing, and again tum Tension
Stud (
B)
halfway back ( com1terclockwise) After the adjustment. Tighten Set Screw
(A).
t-----------\
A
Fig.
14
2) Adjusting the thread take-up spring stroke
Loosen Set Screw ( B ), turn Stud ( C ) cluckwise to increase the stroke or turn Stud ( C )
counter-clockwise to decrease the stroke. After the acljustment, 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.
....-----__,;;,-----------------.
Fig.
15
-9-
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 Medium Light
Figl5 shows different stitch forms. Normal stitch fonn should be
as
shown in Fig.15 ( 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
1)
In case needle thread tension is too strong or bobbin thread tension is too \veak, as shown in Fig.15 ( b
),
tum
the thumb nut counterclockwise to decrease the needle thread tension, or tighten the tension spring regulating
screw
of
bobbin case
to
increase the bobbin thread tension ( See Fig.16 )
2)
In
case needle thread tension is too weak
or
bobbin thread tension is too strong, as shown in Fig.15 ( 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.15 (
d)
and ( e ), adjustments can
be
made with reference to the
above means.
0
Fig.
17
-
10
-
16.
TIME
NEEDLE
TO
ROTAING
HOOK
( Fig.18,19,20,21)
A.
Adjusting the needle position ( See Fig.18 )
1)
Tum balance wheel by hand
to
bring Needle Bar ( C )
to
the lowestposition
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.18 )
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 hookpoint 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)
whenNeedle Bar ( B )
is
lifted
by
2.2mm from the lower end
of
its stroke. Besides, Hook Point (
D)
should
be
l.O-l.5mm 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
+
2.2nvn
-
11
-
0.
05mm
00
21
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 nvo Screws ( D )
of
rotating hook.
5)
Turn 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
of
0.5-0.
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)
of
feed 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 offeed dog
is
that the top offeed dog
is
Imm above Throat Plate Surface ( B
).
4)
After the adjustment, be sure to tighten Screw
(A
).
b
Fig.23 Fig.
24
-12-
19.
Adjustment offeed dog inclination (Fig.25,26):
If
necessary, adjust the inclination according to the material
to
be sewn as follows:
Eccentric
shaft
Fig.25
1) Loosen the screw
"A".
2) Rotate the eccentric shaft clockwise
or
counterclockwise with screw driver.
3) Tighten the screw
"A".
Position of mark on the Feed dog
eccentric shaft
QB-
Horizontal
~
Standard
€D'
Up
~
Front up
(MAX.)
ffi•
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
-
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).
----Cam
Fig.
30
-
14
-
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)
Tum 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
maximum.
3) Readjustment depends on temperature, sewing speed and the like. In practice, oil amount can be judged
as
follmvs: 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
-
+
(f) •
8
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) Cleaning oil pmnp, screen
(See
Fig.34)
Swing out the machine head and clear offthe dust and dirt on oil pmnp screen.
Screen
Fig.33
-
16
-
24
...
Adjustment
of
thread trimmer mechanism:
1)
The
thread trimmer mechanism illustrated
as
Fig.35.
rz:::·······················--;;-i
L':~·_:?
blade
bracket
unit_1
-----
"'-
---
Th"""""'~
Fixed blade
,~
//
Movable knife (ielt) Knife driving Knife driving
Twist spring
Twist spring
crank
shah
; Stopper
Cam follower
crank(l)
Cam follower Drive lever Stopper plate
crank (2)
( 1) Operation stroke
of
the
thread trimmer
solenoid:
Fixed
blade
a.
Standard operation stroke
is
6.
Omm.
b.
This
stroke can be adjusted by using nut "A".
2)
Adjustment
of
knife engagement (Fig.36):
·smm/®
®
( 1) Position ofmovable knife (left) and fixed blade:
See
the
Fig.36, the standard distances from the needle center
arc
7.5mm
and
5mm
from
the
movable knife (left)
and
fixed
blade respectively.
C2) Adjustment ofknife 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
l.5mm-2.0mm.
The
engagement
can be adjustedby properly mounting the drive
arm.
C3) Adjustment ofknife engagement pressure:
a.
Ifa 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 adjusting screw "A"
-17-
Knife driving
crank
I.
5-2
.Omm
Fixed
blade
Movable
knife (left)
Movable knife
(left)
Fig.36
A.
ARM BED AND ITS ACCESSORIES
5
6
41
42
43
44
33
29
36-6
28
23
31
27 26
-18 -
25
32
24
•
e 1
--44
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