HIGHLEAD GC20698-5 Instruction Manual

HIGH LEAD
GC20698-5/-6/-7/-8
Compound-Feed, Heavy Duty
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

-INDEX-
OPERATION INSTRUCTION
1. PRECAUTIONS BEFORE STARTING OPERATION ............................................................... 1
2. SPECIFICATIONS ........................................................................................................ 1
3. SETTING UP THE MACHINE ........................................................................................... 2
4. OILING ....................................................................................................................... 2
5. NEEDLE ..................................................................................................................... 3
6. THREAD ...•................................................................................................................. 4
7. WINDING THE LOWER THREAD ON THE BOBBIN ........................................................... .1
8. REMOVE AND INSERT THE BOBBIN ............................................................................... 1
9. THREADING THE NEEDLE .............................................................................................. 5
10. REGULATING THE THREAD TENSION ............................................................................. .J
11. ADJUSTMENT OF THE STITCH LENGTH.............. _ _ . ......... ..... . ........................... o
12. ADJUSTMENT OF THE PREESURE .................................................................................. 6
13. REVERSE STITCH ......................................................................................................... 6
14. WIDTH OF ZIGZAG AND LENGTH OF STITCH ................................................................... 7
15. ADJUSTMENT THE HEIGHT OF THE FEED DOG .............................................................. 7
16. TIMING BETWEEN THE HOOK AND THE NEEDLE ............................................................... 8
17. ADJUSTMENT OF BOBBIN CASE OPENER ............................................................................. 9
18. THE HEIGHT OF THE PRESSER FEET ............................................................................. 9
19. TIMING OF THE VIBRATING AND LIFTING PRESSER FEET ............................................... 10
20. THE CLEARANCE OF THE VIBRATING AND LIFTING PRESSER FEET .............................. lO
21. ADJUSTMENT OF THE THREAD CONTROLLER SPRING ................................................... 11
22. REPLACEMENT OF THE CONNECTION BELT .................................................................. 11
23. TO RE-ENGAGE THE SAFETY CLUTCH .......................................................................... 12
24. ADJUSTMENT OF THE OILING FOR THE HOOK SADDLE ................................................. 13
PARTS CATALOG
A. ARM BED AND IT'S ACCESSORIES ............................................................................... 14
B. ARM SHAFT MECHANISM ........................................................................................... 17
C. PRESSER FOOT MACHANISM ....................................................................................... 20
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D. STITCH REGULATOR MACHANISM .......................................................................... 23
E. HOOK SHAFT MECHANISM ......................................................................................... 26
F. THREAD TENSION REGULATOR MACHANISM ................................................................ 29
G. PARTS FOR SINGEL NEEDLE .................................................................................... 32
H. PARTS FOR TWIN NEEDLE .......................................................................................... 34
I. SPECIAL PARTS FOR 20" ............................................................................................. 35
J. ACCESSORIES .......................................................................................................... 37
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1. 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 in use, or when the operator leaves the seat.
(
3) Power must be turned off when 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 in operation.
(
5) Do not insert fingers into the thread take-up cover, under/around the needle, or pulley when the
machine
is in operation.
(
6) If a belt cover, finger guard, eye guard are installed, do not operate the machine without these safety
devices.
2) Precautions before starting operation
(I ) If the machine's oil pan has an oil sump, never operate the machine before filling it.
C
2) If the 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 machine nameplate.
3) Precautions for operating conditions
(I ) Avoid using the machine at abnormally high temperatures ( 35 OC or higher) or low temperatures ( 5
"C or lower) .
(
2) Avoid using the machine in dusty conditions.
2. SPECIFICATIONS
GC20698-5
GC20698-6 GC20698-7 GC20698-8
MAX.
SPEED (s. p. m. ) 1, 200
MAX.
STITCH (mm) 10
MAX.
LIFT OF FOOT
(mm)
20
NEEDLE
DY X 3 (standard
No. 24)
• SY5213
.
794
BOBBIN SIZE (mm)
cD37X 13
WORKING SPACE (mm) 508
X
153
762 X 153
BED DIMENSION(mm)
846
X
230
l,
100 X 230
3/4" 3/4"
(19mm) (standard) (19mm) (standard)
NEDDLE SPACING
--
1/4 "(6. 4 mm)~
1/4 "(6. 4 mm)~
1-3/4"(44. 5mm)
1-3/ 4" ( 44. 5mm)
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USE FOR:Tent,Sailcloth,Rubberized,Fabrics,Heavy Synthetic, Heavy Upholstery Materials,Fiber
Plate,Leather,Etc.
3. SETTING UP THE MACHINE cFig. 1)
Setting up the machine on the table after removed two pieces of supporting bolts (A) under the bed.
Fig.I
4. OILING cFigs. 2, 3, 4 & s)
Oil should be applied at each of the place designated by arrows in Figs. 2, 3, 4&5.
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Fig.2
Fig.3
Fig.4
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Fig.5
To fill the oil for reservoir of hook saddle from the hole after taken out the oil gauge A(Fig. 6 )and pour the
oil until the oil level reached to the upper reference line 8
of the oil gauge (Fig. 6-1) .
When
in continuous use, it should be oiled at least twice a day.
A B
Fig.6 Fig.6-1
5. NEEDLE cFigs. 7 & 8)
HIGHLEAD GC20698-5,-6,-7,-8 series machines are set up to use standard needle of DYx3
(standard No. 24) ·SY5213·794. The size of needle to be used should be determined by the size of
thread, type and thickness of the sewing materials.
To insert the needle, turn the machine pulley over toward you until the needle bar moves up to its
highest point,
put the needle up into the needle bar as deeply as it will go, with the long groove of
the needle faced outside.
Tighten the needle set screw securely.
Fig.7 Fig.8
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6. THREAD cFig. 9)
Normally, left twisted thread is used for upper (needle) thread. (But, for left side needle of
twin-needle machine, it can be finished in fine results with right twisted thread)
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l//IZZZZ7_LLL;_
Left Twist Rigth Twist
Fig.9
7. WINDING THE LOWER THREAD ON THE BOBBIN CFigs. 10 & 11)
Pass the thread through ( 1) - ( 4) , and wind several times around the bobbin, which set up to the shaft of
bobbin winder.
Press the lever ( 5) to arrow direction, then the bobbin winds the thread automatically, in engage with the
operation
ofthe machine.
The bobbin will automatically be stopped after the bobbin is filled with thread.
Fig.lO Fig. II
8. REMOVINGAND INSERTING THE BOBBIN c Figs. 12 & 13)
Draw back the side plate ( I ) on the bed of the machine, and raise the hinged latch ( 2) to a vertical position,
then remove and insert
the bobbin.
Insert the bobbin and pull thread (
3) out about 4-Scm, then push down the hinged latch ( 2) and draw the
thread end under the tension
spring ( 4) .
When closing the side plate ( I ) , leave
just enough space for the thread to pass through.
Fig.12 Fig.13
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9. THREADING THE NEEDLE CFigs. 14 & 15)
Pass the thread from thread guide ( 1) -eyelet ( 2) -tension disc ( 3) -tension thread guide ( 4) -guide ( 5)
-thread take-up spring ( 6) -guide ( 7) -take-up lever ( 8) -guicle ( 7) -lower guide ( 9) -self threading needle
bar thread guide ( I
0) -through the eye of the needle ( 11 ) .(Remark) Wind the thread a single time to tension
thread guide (
4) .
With the left hand hold the
end of the needle thread leaving it slack from the hand to the needle. Turn the ·
machine pulley over toward you until the needle moves down and up again to its highest point, thus
catching the bobbin thread,
draw up the needle thread, and the bobbin thread will come up with it through
the hole
in the feed dog.
Lay the thread back
under the presser feet and close the slide.
Fig.14 Fig.15
10. REGULATING THE THREAD TENSION CFigs. 16 & 17)
The tension on the needle thread is regulated by the thumb nut A (Fig. 16) .
The tension on the
bobbin thread is regulated by the screw of the tension spring on the outside of the bobbin
case B (Fig.
17) .
To increase the tension, turn over nut A or screw to the right, and to decrease the tension, turn over nut or
screw to the left.
Fig.16 Fig.17
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11. ADJUSTMENT OF THE STITCH LENGTH c Fig. 18)
The length of stitch is regulated by pressing down the button ( I ) with left hand, while turning the machine
pulley (
2) slowly with right hand in the condition of setting the top of button ( 1) to the feed eccentric.
TtJ increase the length of stitch, turn the machine pulley over toward you.
To decrease the length of stitch, turn the machine pulley to opposite direction.
When the desired
length of stitch is obtained, operate the machine after fully confirmed releasing the button
( I ) to the original position.
Fig.18
Fig.l9
12. ADJUSTMENT OF THE PRESSURE CFig. 19)
The pressure of the presser feet is regulated by the adjusting screw.
To increase the
pressure, tum the screw to clockwise, and decrease it, turn the screw to counter-clockwise.
13. REVERSE STITCHING CFig. 20)
The chain for the feed reversing pedal is connected to the hook of feed reversing lever A underneath of the
bed
of the machine.
To feed the
work toward you, press down firmly on the feed reversing pedal, and do not stop to press down
on the way.
Fig.20
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14. RELATIVE POSITION OF VIBRATING AND LIFTING PRESSER BAR,
OF THE NEEDLE AND THE NEEDLE HOLE OF THE FEEDER CFigs. 21 &22)
The distance between the vibrating presser bar ( 1) and lifting presser bar(2), after adjusting the feed eccentric so
that there is no feed movement of the needle bar, should be 15.5 mm (one needle) and 14.5 mm (two needle) .To
adjust by the screws for connecting crank (3).
Normaliy, relative position
of the feed dog against the needle, the needle should be passed through the center of
the needle hole of the feed dog.
To adjust by the screw for the feed rock shaft bell crank(4 ).
Securely tighten the screws after finished adjustment.
Fig.21 Fig.22
15. ADJUSTMENT THE HEIGHT OF THE FEED DOG cFigs. 23,24 & 25)
The maximum height of the feed dog from the surface of the needle plate is normally 1.3 mm.
To adjust this height by the screw on the feed lifting cam fork of the feed bar and raise or lower the feed dog, as
may be required, and retighten the screw ( 1) .
Fig.24
Fig.23 Fig.25
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16. TIMING BETWEEN THE HOOK AND THE NEEDLE CFig. 26)
Set the feed eccentric with the button at no feeding position, and confirm the length between vibrating and
lifting presser bar should be 15.5 mm.
If the n~edle bar and sewing hook are correctly timed, the point of the
hook will be at the center of the needle when the needle raised 3.8
mm + 0.5 mm from the lowest point.
1) Adjustment of the timing
( 1) For the adjustment of timing, loosen 2 screws ( 1) for hook
driving gear, and tap this
gear to the right or left in clearance of 2 mm
on the hook driving
shaft until the point of the hook is at the center of
the needle.
(
2) Tapping to the right gives on earlier hook timing, and to
the left gives later hook timing.
( 3) Except the above case, to adjust in changing gear condition
between hook driving
gear ( 2) and hook shaft gear ( 3) .
( 4) Securely tighten the two set screws for hook driving gear
after finished adjustment
2) Adjustment of the cleraance
Normal clearance between hook point and scarf of the needle is in
0.02-0.1 mm
( 1) Loosen two screws (
4) and ( 5) for hook saddle.
(
2) Move hook saddle to right or left, as may be required, until
hook point
is as close to needle as possible without striking it.
( 3) Then securely tighten two screws.
(
4) To check the needle with careful attention free from bent
before adjustment.
3) Height of the needle bar CFig. 27)
Normal clearance between top of the eye of the needle and hook point is 2.2 mm.
In case the needle bar is incorrectly set, loose the needle bar connecting stud
pinch screw
(A) and place the needle bar in correct position as required above,
then retighten the
screw (A) .
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Fig.26
Fig.27
22mm*
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17. ADJUSTMENT OF BOBBIN CASE OPENER cFig. 28)
( 1) Turn the machine pulley or hand wheel ( GC20698-6,-8 series machine) until the top of the
opener is located at the distance from the needle plate.
( 2) In this position, adjust it so that the clearance A between the inside edge of the openerand the
top of the hook is about 0.3 - 0.8 mm.
( 3) Securely tighten the screw after finished adjustment.
Fig.28 Fig.29
18. THE HEIGHT OF THE PRESSER FEET c Figs. 29,30 & 31)
Normal distance between the surface of th'. needle
(A )and vibrating presser foot at stopped position
of the stop lever (C) is 19 mm.
When step on the lifting pedal, the
lever (C) will be released by the lifting lever (B)
To change the relative lift of the pres::.er feet, loosen the screw ( 1) at the above condition.
The height of lift nf the presser feet is adjustable by moving the screw of presser bar lifting bracket.
Normal distanc presser bar position guide bracket ) ) and presser bar
ic,uide ( 4) is 7
mm.
Position of the vibrating presser foot to shift left and right is to be adj
the screw ( 2) for presser
bar liftihg bracket and the screw C 5) fo1 presser bar position guide bracket.
Fig.30 Fig.31
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19. TIMING OF THE VIBRATING AND LIFTING PRESSER FEET CFig. 32)
The amount of lift of the vibrating and lifting presser feet should be regulated according to the thickness
of materials being sewn.
The feet should lift just enough to clear the materials.
As a rule, the vibrating and lifting presser feet should lift an equal height, but some grades of work may
require that they lift an unequal height.
To change the relative lift of the presser feet, loosen the screw (A) for lifting rock shaft crank and move
the vibrating presser bar upward or downward as required, then securely tighten the screw (A) .
Upper Surface Fig.32
20. THE CLEARANCE OF THE VIBRATING AND LIFTING PRESSER
FEET cFig. 33)
The amount of the lift of the alternating feed for the vibrating and lifting presser feet are to be adjusted by
the lifting bell crank link screw stud ( 1) .
To
decrease the movement in setting the stud ( 1) at the upper position, and to increase the movement in
setting the stud ( 1) at the lower position. After setting to the required position, securely tighten the stud
( 1) with nut ( 2) .
The clearance for the vibrating and lifting presser feet are being adjusted at maximum, so that the
clearance of them should be adjusted according to the materials being sewn.
The timing position for the vibrating and lifting presser feet should be regulated by Fig. 32.
Fig.33
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21. ADJUSTMENT OF THE THREAD CONTROLLER SPRING cFig. 34)
For more controller action on the thread, loosen the set screw ( 1) at the right of
the controller and set the stop lever, and for less action set the stop higher.
To strengthen the action of the controller spring on the thread, loosen the spring
stud screw ( 4) at the rear of the stop screw and turn the spring stud ( 5) slightly
to the left with a screwdriver, or lighten its action turn to the right and securely
retighten the spring stud screw.
22. REPLACEMENT OF THE CONNECTION BELT
Fig.34
1) When the connection belt removed from the pulley for adjusting and or replacing
purposes of the parts C Figs. 35 & 36)
( 1) Turn the machine pulley toward you so that placed the take-up lever( A )at the highest position.
( 2) Turn the hook shaft with the fingers until the arrow mark ( 2) on the hook driving shaft bushing
collarand the red point mark ( 1) on the hook driving shaft bushingare directly in line.
( 3) Then replace the belt over the upper and lower pulley.
Fig.35
Fig.36
2) Replacement of the connection belt when damaged C Figs. 37 & 3 8)
( I ) Remove the upper arm plate and reservoir.
( 2) Slide the connection belt (A) off from lower and upper belt pulley.
C 3) Loosen the machine pulley adjustment screw ( 2) and two set-screws for the machine pulley
( 3) . then remove the machine pulley.
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( 4) Loosen the three screws in the arm shaft bushing ( 5) and remove the bushing ( 6) .
(
5) Lift the belt up through the arm cap hole after removed the bushing ( 6) as far as possible and
draw it out
through the space normally occupied by the bushing.
(
6) Replace the connection belt as opposite processes as above for removing it.
(
7) Securely tighten ali the screws, so as to fit the ann shaft, firmly, free from looseness.
1 2 3
Fig.37 Fig.38
23. TO RE-ENGAGE THE SAFETY CLUTCH CFigs. 39 & 40)
The hook driving shaft and the shaft of the sewing hook ar"e splined to prevent the hook from getting out of time.
The safety clutch located
in the lower belt pulley prevents damage in the event of thread jamming in the sewing
hook
by releasing the locking lever in the pulley.
Take out jammed thread from the hook.
To re-engage the clutch, press down the lock stud (A) , near the base of the ann by left hand and turn the
machine pulley backward siowly by right hand, then the safety clutch will be released.
In the case easily releasing the safety crutch, adjust the pressure by the screw (B) for lower belt pulley after
removed connection belt
(C) .
To increase the pressure in turning the screw ( 8) to clockwise and to decrease the pressure in turning the screw
(B) to counter-clockwise.
Fig.39
Fig.40
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24. ADJUSTMENT OF THE OILING FOR THE HOOK SADDLE cFig. 41)
Loosen the screw for the oil adjustment dial ( 3) and adjust oil supply by turning the oil adjustment dial
(
2) . Maximum oil supply at the directly in line of the point mark ( 1) on the hook saddle and the center
Iine of the dial ( 2) . Stop the oi1 supply at the vertical position of the center 1 ine of the dial ( 2) .
Fig.41
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A. ARM
IES
-
4
41
2
1'-28
10
43
50 54
~
~ ~
I ' ~
--------------- 71 --· •.•
- 14-
.,
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A.ARM BED AND
ITS ACCESSORIES
A-,..,_,~~-~=--·~-
Fig.
Parts
Description Remarks
Nos. Nos.
AOl
HE924B7101
Foot lifter lifting lever latch handle
A02
HA100B2110
Set screw
A03 HE913B8001
Collar (upper)
A04 H7214H8001
screw
A05 HE915B8001
Foot lifter lifting lever latch spring
A06 HE916B8001
Collar (lower)
A07 HA100C2170
Set screw
AOS HE917B8001
Foot lifter lifting lever latch
A09 HE918B8001
Foot lifter lifting lever
AlO HE919B8001
Pin
All
HE920B8001
Foot lifter lifting lever hinge stud
Al3 HE921B8001
Foot lifter lifting lever spring
Al4 HE048D8001
Screw
Al5 H7014D7101
Down-lead complete
Al6
HE021B8001
Nut q
""
A22 HE949B8001
Lubricating oil cup (front).
A23 HE950B8001
Oil pad
A24 HE930B8001
Oil wick (A)
A25 HE931B8001
Vinyl tube (A)
A26 HE951B8001
Arm cap (front)
A27 HE045D8001
Washer 2 2
A28 H2015I0065
Stop screw 2
A29 HE928B800l
Lubricating
A30
HElllF800' screw
A31 HE920.)c' l
A32
111:9.l2B()00 1 wick
A33 HE933B8001
Vinyl tube !
A34 HE930B8001
Oil wick l I
A35 HE931B8001
Vinyl tube I
A36
i lE934B80U l Arm cap I
A40
H7327B8001
Armoii
A41
HE020B8001
Thread guide
A42 HE937B8001
Face plate
A43 HE938B8001
Face plate thumb scew
A44 HE939B8001
Thread guide (lower)
A45 HE025C8001
Screw 2 2 2
A46 HE940B8001
Throat plate.
-------
A47 HE005H8001
Throat plate screw
A48 HE006H8001
Throat plate position screw
A49
I-!3200B2130
Throat plate stop
A 50 HE942B8001
Bed slide (left)
-15 -
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A.ARM BED AND ITS ACCESSORIES
•r,
'>.0 r-- co
Fig. Parts ' ' ' '
co co co co
Description
0' 0' 0' 0'
Remarks
Nos. Nos.
'>.0 '>.0 '>.0 '>.0
0 0 0 0
01 01 f'l 0~
lJ lJ lJ lJ
Q Q Q Q
AS! IIE943B800l
Bed slide (right) I l
AS2 l!E946B8001
Bed slide stop I I l I
AS3
IIE009Jl800 l Bed slide stop spring I I l I
AS/1
l!E914B8001
Bed plate (front) I I l l
/\55 I lEO 13H800 1 Screw l I l l
Ail6
l!E9il7138001
Arm cross shaft bushing l l
Ail7
l!E011C8001
Oil wick I I
i\.')8
HE040D800l
Set screw l l I I
AS9
HE9S8B800l
Arm cross shaft gear l I
i\60 IIE0!7G8001
Position screw l l
i\61 HE023C8001
Position screw l l I
i\62 l!E959138001
Hand wheel driving gear l l
A63
l!E022G800l
Set screw l I
i\ti4 l!E960138001
Set screw l l
i\65
l!E9ti lB800 l Hand wheel disengaging sprillg plunger
:l :l
i\ti6 I!ElJti2!3800 l Hand wheel disengaging spring
')
,)
l
Atil ll!lJti:lll800 l Hand wheel l I
i\ti8
!1196413800 l Hand wheel engaging plate l I
Mi9
I!A700F2100
Screw ;j I
i\70
IIE9tiill3800 I Arm cross shaft I I
i\71
IIE956!3800 1 Machine supporting bolt
')
:J :J :J
,)
f\7'2
118000112070
Foot lifter lifting lever chain hook I I I I
i\7:3
112000\1009()
Ball oiler
;)
:)
;J :)
i\74
Hi\7001:21 00
Screw l I
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