Global ZZ 2560 Series User manual

ZZ 2560 series
Flatbed zig-zag machines
Instruction manual
& parts book
Always switch off the electricity when working on
the machine.
GLOBAL

CONTENT
1 Safety operating guide .. : .......................... .. . . . ..... . 2
2 Operating n
otice ........... . . ......... . ....................... 2
3 Operating
condition .. . .. . .. . .. . .......... .. . . ... . . . .. .. . .. . . .. 2
4 Chief
specification ....... .. ...... . ........ . .. .. . .. ........... 2
5
Instal l belt . .......... .. ........... ..... . .. . .. ......... ... . .. 3
6
Install belt cover ....... . .... . .. . .......... .. ................ 3
7
Th e needle bar position adjust m ent . ....... . ...... . . . ....... ... 4
8 Operation guide
....... .. ....... .... . . .... ......... . . .. . ....... 4
9 To
lu b ricate the machine. ..... . . ... .................... . ..... . 4
10 Th e hook lubricating condition adjustment ....... . .......... ... 4
11 Time machine cleaning ........ . .... ... ... ..... . ...... ..... .. ... 5
12 Wind the bobbin. ............ . ......... . .... . .. .. .............. 5
13 Install the needle. ...... . ....... ... ...... ..... .... . . . . ... ... . 6
14 Bobbin
fixing and hoo k threading .......... ........ .. ....... ... 6
15 To thread upper thread ............ . .... .. . . . .. ... .... ......... 7
16 The thread tension adjustment .. ... .. . .. . .. . .. .............. ... 7
17 The thread take up spring tension adjustment .... .. ... . . .. ..... 8
18 Th e presser foot pressure adjustment ..... . ..... . .. . .. . . .. ..... 8
19
Stitch length setting mechanism .......... ... ............... ... 8
20 Zig-zag stitch width (throw) and position setting . . .. . .. .. .. . . 9
21 To oth clearance setting of zigzag st i tch gear. . ... . ........... 10
22 Straight stitch alignment. . ................................... 10
23 Zigzag stitch width. . .. . ... . ........... . .. . ......... .......... 11
24 Needle stab position setting in feeding direction ............. 11
25 Lateral setting of needle stab position ..... ....... ........ . . . 12
26 Lateral setting of central straight stitch position .. .. .. ..... 12
27 Lateral setting of straight stitches on throat pl ate needle hole edges,
arresting of zigzag stitch se ttin g mechanism .. . .... . . ......... 13
28 The gap between hook assembly and needle adjustment. .... . ... .. 13
29 Bobbin case driver. ..... . .... . .... . .............. . ............ 14
30 The feed dog h eight adjustment ......................... .. ..... 14
31 The feed dog obliquity adjustment .. .. .. ........ .. .. . . ......... 14
32 Timing between needle and feed dog motion. .... .. .. .. .......... 15
33 Th e forward/backward stitch length error adjustment. . .. . . . . . . . 15
34 Th e position between hook and opener motion adjustment ........ 15
35 Form stitch of patterns cam series .................. . .. .. . . ... 16
Tooth clearance setting of form stitch gear ............. . .. ... 16
Roller bolt position of form stitch steering cam .............. 16
Setting of needle stab position ... . .... .. . ........ .. .. .. .. ... . 17
Timing of form stitch steer i ng cam to needle motion ........... 17
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36
F
orm
stitc
h
of
patterns
cam
with part
number
.
.......
.....
....
.
17
37 Backtacking with
solenoid
...................
.
......
...........
18
38
Pr
esser
foot
li
ft
i
ng
........
.
.....
.....
.....
...........
...
....
19
39
Bobbin w
inder
.....
.
.........
...
......
.
...............
.........
20
40
Thread t
rimm
i
ng
...........
...
....
.
............................
20
41
Machine
electronic
control
and
drive
. .
..........
.
............
.
21
2
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Thank you to choose zigzag stitch series industrial sewing machine
This is an instruction manual & parts list, it could help you how to use machine & how to care of machine
correctly and make you convenience to look
up parts.
In order to avoid trouble occurring, please read this instruction manual carefully before operating machine,
and please accept safety operating guides with comefrom special technicians
or peoples of having operator
experiences.
1 Safetyoperating guide
- W
hen turning the power on, keep your hands and fingers awa y from the area under th e needle and around the pulley.
-Power mustbe turned off when the machine is not used or when the operator leaves his/her seat.
-Power mustbe turned off
when incline the machine head, install/remove the belt or mo ve machine.
-Do
not place finger, hair, shaft etc. near pulley, belt, wheel and motor in order to avoid injury when the
machine is in operation.
-Do
not insert finger into the thread take up lever guard cover, keep your hands and fingers away from the
area underthe needle and around the pulley when the machine is in operation.
-+- Do not operate the machine withoutthe safetydevices if the belt cover or eye guard are installed.
2 Operating notice
-
Do not operate the machine if the oil tank without full oil.
-The machine adopt semi-automatic lubricating mode. Do not operate the machine before lubricating.
-Check the rotation direction
of pulley when firstly start new machine.(The pulley should rotate in
counterclockwise when viewed from pulley)
-+- Check the voltage and phase.(Single or three phase whether is corresponding with the data in motor nameplate)
3 Operating condition
-Avoid using machine at abnormally high temperat ure (40 "C or higher) or low temperature (5"C or lower).
Otherwise
mc:1chine failure may result.
Avoid using machine in dustycondition.
4 Main technical specifications
Large hook Standard hook
Small hook
Max . zigzag stitch width/mm 10 8 6
Max. sewing speed for 6mm stitch width Adjust
as per the actual situation Ad just as per the actual situation
3500
Max. sewing speed for 8mm stitch width
Adjust as per the actual situation
3000
-
Max. sewing speed for 10mm stitch width
2000
--
Standard sewing speed
2000
2500
2500
* The machine is set up to the standard sewing speed in the factory.
* The sewing speed value determined by the size of the hook mus t n ot be exceed wi th a resp ec t to the machine's lif etime.
Usually Is necessary to do re duction the speed's value according to used thread, needle and sewn material.
3
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5
Stitch type
Stitch length
Foot lifting with hand lever
Foot lifting with knee lever
or solenoid
Lubricating mode
Needle system
Manually controlled subclass
Solenoid-controlled subclass
Sewing head weight
Sewing head (all-in-o ne machine) weight
Stand weight
Thread length aftertrimming
Machine head
clear workspace
Machine table dimensions
Input
of machine with DC motor
Machine floor plan dimensions (including stand)
Install belt
Use V-belt which special for se wing machine.
double thread zig-zag lockstitch
max.Smm
5mm
12mm
Semi-automatic lubricating
134; 134-35
DC motor-positioning motorwithout further functions
DC mo to r (AC servo) - positioning motorwith reverse run after thread trimming
40kg
30kg
max.20mm
265 x 120mm
178 x 476mm
max.800W (short-time at start up)
1060 x 550mm
To adjust the tens io n of belt. Ch ange the height of motor through turn the tension adjusting nut. It is ok if the belt sinks insi de with 15mm
when pressing the center position
of be lt surface. Lacking tension will cause unstable running speed of machine, or needle stand at wrong stop
pos ition when machine In midd le / s low running condition. Excessive tension will cause the motor bearing be damaged.
15mm
(Abo ut 1 kg strength)
6 Install belt cover
Machine head and motor must install belt cover for safety.
4
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7 The needle bar stop position adjustment
If the lo calizer adopts external hanging type, please refe r to the motor instruction book for the adjustment method
- " Up " Position
When t he pedal is kicked down byheel, the machine should stop at "Up " position, i. e. the highest pos ition of take - up lev er.
- " Down " Position
When the pedal is stand at middle position , the machine should stop at " Down " position , i.e . the
needle bar raises 3mm from its lowest position.
8
9
Operation guide (motor and control box)
Keep foot away from pedal when turn on I o ff the po wer. Power must be turned off w he n the operato r leaves his / her seat.
The detent can 't work when t he power is interrupted or power failure occurs during the machine operation.
Keep the control box coverisclosed during operation in orderto avoid accidental operation since the dust come into control box.
Must use multimeter to check cont rol loop circuit in or d er to protect the semiconductor parts
Power must be turned off when incline mac hine head only or touch needle.
Must u se earth cable (with yello w/ green color) to connect motor.
Whe n check the internal circuit, it must turn off the power firstly and then open the front cover.
It
must wait 10 minutes afterturn offthe powerduethe highvoltage In box . (It Is very important to release the internal energy)
K
eep m oto r away from mu ch noise area such as high frequency we ld i ng area whe n use ii.
To lubricate the machine
Clean the machine completely before operate it daily, and checkthe oil quantity of hook oil tank. Then inject
oil as arrow shows in below picture, start operation
of machine.
_)
t
· i.
10 The hook lubricating condition adjustment (see above picture)
-To adjust hook lubricating through screwAwhich site before oil tank of hook.
-The oil quantity is low est when screw A was turned with clockwise and the arrow points to "O"position.
-+The oil quantity is highest when screwA was turned with anticlockwise and the arrowpoints to "MAX" position.
5
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11 Time machine cleaning
12
-
-
-
The hook, feed dog and oth er parts of machine should be cleaned daily, and drop two or three coal oil
into hook and other parts that need to be lubricated. Clean all the spilth after ending
of highest speed
operation
of machine, then lubricate the machine with oil. The clean work must be insisted every day.
(Especially the machine worked one week, the clean work is very important, as the spilth will affect the
sewing capability and rust hook and machine. It should take awaybobbin from hook before cleaning.)
Maintenance
of motor: clean dust of the motor cover each one month or two months. (More dust or
sundries ofmotorcover will make it too hot.)
Maintenance
of control box: clean dust of the connector. (Itwill affect accidental operation if there is more
duston the connector.)
Warning!
Before cleaning and lubricati ng the machine, be sure to switch offall switches and hold your feet away
from the machine stand pedal in orderto avoid accidental machine start by pedal.
Wind the bobbin
Fix the bobbin (1) on the winder.
Do the threading according to picture (A ), wind 5 times round the bobbin.
Insertthe thread under cutter (2) and tear off by pulling in the arrow direction (3).
Pull the lever (4) in the arrow direction (5
).
Start the machine up.
-After the bobbin winding , wind t he thre ad ro und the cutter(2) ac co rding to pictu re (B) a nd te ar it offby pu lli ng Inthe arr ow d ir ection (3).
- Fix another bobbin im mediately and prepare it s winding during the sewing.
/ •
6
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13 Insert the needle
Please use DPx17 NO. 90-120 needle, the thickness of needle should be decided according to the
thickness ofsewing material & thread. When insert the needle, rotate the hand wheel until the needle bar
has reached its top position, loosen the screw on the lower part ofthe needle bar and insert the needle. Be
sure that the long groove
of the needle directly toward the operator and check whether the needle shank
has reached the bottom ofthe needle hole. Fix the needle by tightening the screw.
Warning!
Before insert the needle, be sure to sw itch offthe main switch.
If the terylene thread is broken when backstitch, turn the needle groove to right, maybe can avo
id this
condition. Normallyavoid the needle groove face to left.
--
X X 0
14 Bobbin fixing and hook threading
Attention! Danger
of injury!
Switch the main switch offand wait for the motor stopping.
-Tilt the flap
(1 ), grip it and pull the bobbin case (2) out of the hook.
-Put the bobbin (3) in the bobbin case with the thread end (4) oriented according
to the picture.
-Drawthe thread end (4) through the slit (5), pull underthe spring (6) and pull into the slit (7).
-Insertthe case (2) back in the hook and press it down in the arrow direction (8) till the lock inside the case
clicks and secures
it againstfalling out.
- Make one stitch withoutthe sewn material, and drawing the thr ead upper end, pull the hook thread end outwards abo ve the throat plate.
8
2 1
7
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15 To thread upper thread
Let the take up lever atits
hi
ghe
st
position. Then threading as
shown
in
picture. Unwind a sufficientportion
of
thread, and pass
itthrough the thread guide (1) and
(2
), then lead it through the
tension assembly (6) and thread take up spring (5), thread guides
(7), (4) and (3) into the thread take up lever. Then downwards
through the thread guide (4) and the lower
thr
ead guide (8) to the
thread guide
(9
) on the needle bar, and to the needle. Insert it into
the needle holefrom the front side to the rear side.
16 The thread tension adjustment
A
. 1
-
·-
2
.3
,·
~"
4
, 5
..
6
.. - 8
9
The tensi
on
of
the upper and the lowerthread must be interrelated thatthe stitch forming and the sewn material.
-
To
adjustthe upper
threod
tensionaccord
ing
to the lower
thread
tension.Tum
the
tension adjusti,g
nut
n
doci<wlse
to Increase the ten
sio
n.
o,
1w
er1ely
, to decrea
..
It.
-
To
adjust the lowerthread tension by turning
ad
justing screwA.
-It can adjust the take up spring to adjust upperthread tension
for
special sewn material and thread.
Tension
adjusri,·e spr
ing
pla
te
Tighten
0 X
//(('~
lighten
'T[•
0
__,
/
Loosen
.~
I
--
Tension
'adjusting nut
X
Balance tension Upperthread tension too tight Lower thread tension too tight
or lo
wer
thread tension too loose
or
upper thread tension too loose
8
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17 The thread take up spring tension adjustment
Loosen thread tension assembly screw (1 ), take away the thread
tension assembly from machine to adjust the take up spring (4).
Firstlyloosen the screw (2)
of bushing (3), and then adjustthe angle
position of lever (5). Turn it to left can decrease the
elasticity
of spring, or inversely, to increase it.
18 The presser foot pressure adjustment
-To adjustthe presser foot pressure according to the sewn material.
-Adjustment as shown in picture.
-The pressure
of sewing mustto be adjusted as its min. value. But
as same time, the pressure of presserfoot must be sufficient to
ensure reliable and continuous feeding even at the
top speed.
19 Stitch length setting mechanism
Regulation
If the zero stitch length is set, the hand levershould perform no lost motion.
-Loosen the screws (1)
-Setthe setting knob (2)
on the zerostitch length.
-Shiftthe lever(3) in the arrowdirection until its fork is in bilateral contact
with the
screw spherical end on the knob (2) axis
-Tighten the screws (1).
-Checkwhetherthe backtacking lever (4) performs any lost
motion in this position.
Zero stitch length
Regulation
If the zero st it ch length is set, the connecting rod (3)should perform no motion.
-Set the stitch length knob on the zero cipher.
-Tilt the machine and loosen
the screw (1 ).
I~
2 3 4 5
1
3
I 4
•l
-Shift the sleeve (2) until the position isfound where the connecting rod (3) stops moving.
-Tighten
the screw (1 ).
9
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20
Sotting ofzig-zag stitch width (throw) and position
Attention!
At setting the zig-zag stitch width (throw) and position the needle must not
be
inside the sewn material. There
is a threat
of
the needle breaking!
Setting ofzig-zag stitch width
Press the lever (1) in the arrowdirection (A) until it strikes the lever(2).
The le
ver
arrest is released (2). Grip both levers at the same time and set the zig-zag stitch
width by turning the lever (2) against the selected numberindicating the stitch width.
--
Arrest the lever (2) position byturning the lever(1) against the arrowdirection (A).
--
--
--
Setting
of
zig-zag stitch position
Press the lever (1) in the arrow direction
(A
) until it
str
ikes the lever (2)-the leverarrest is released (3). Make
sure
that
the lev
er
setting does notchange
at
the arrest switching off (2).
Press the lever (3) and turn it
at
the same time up to the stop (inside the machine) against the respective
symbol indicating the zig-zag stitch position. Only the middle position
of
the
lever is
ar
rested with a lock.
Afterthe lever (3) setting, carry out arresting with the lever
(1
).
In picture (B) there are examples
of
setting the zig-zag stitch width and position from which it is visible that
the zig-zag stitch width does notchange
at
the position change.
2 1 B
!N
l-N
--•
•
10
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21 Tooth clearance setting of zigzag stitch gear
The tooth clearance of zigzag stitch should be as small as possible.
No over l ap instead ofclearance, however, mayarise in any mutual position
of the gears.
-Dismantle the machinetop cover.
Loosen the screw (1) and turn th e eccentric bolt (2) un til the gear fitted on it strikes the gear (3). With regard of the gear runout,
caused
by manufacturing inaccuracy, tum the hand wheel by 114 revolution, and set the clearance again.
Repeat this 8 times (2 revolutions of the main shaft), until the eccentric bolt (2) position with the smallest
tooth clearance
is found. Locate the bolt (2) in this position and fix it with a screw (1 ).
22 Straightstitch alignment
-
The centrally positioned straight stitch mu st befully aligned, i.e. the needle must not have any lateral motion.
Set the zero stitch length.
Loosen the screw
(1 ).
Place the stop pin (2) to
the stop onto the casing (3).
•
Place a piece of paperonto the throat plate and turn the hand wheelthere and back until the needle point makes 2 holes in the pape r.
Loose n 3 sc re ws (4) a nd try to set t he casing (3)ang le pos it ion un til th e needle. when be i ng turn ed , sta bs ther e a nd ba ck in the s am e ho le in th e pa per.
Tighten the screws (3).
ll
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-Fixthe lever(5) so that the mark (6) is located opposite the zero on the zigzag stitch scale
(7).
23
Zigzag
stitch
width
The zigzag stitch width setting mustbe limited to the value prescribed
for
the applied sewing equipment with the setting tolerance
-5%
of
the prescribed value.
--+-
--+-
Set the zero stitch length.
Place a piece
of
paper onto the throat plate.
Loosen the screw
(1
).
Try
to
set
the lever (2) in the positioncorresponding with
the required zigzag stitch width.
Tum
the hand wheel
there and back until the needle makes 2 holes In the
paper. Measure their distance. Change the lever position
(2)
un
til
the
distance
of
t
he
holes complies with the regulation.
-+-
Shift the screw (1) to the stop and tighten it.
24
Needle stab position setti
ng
in feeding direction
2
If
the needle is in the bottom dead center, it should be positioned in the throat plate needle hole center in
feeding direction and its lost motion in the feeding direction should be as small as possible.
Place the needle in the bottom dead center.
Loosen the arresting screws (1),(2), and the regulating screw (3).
Adjust the scr
ew
(4) so that the
re
gulation is complied with and arrest it with the screw
(1
).
Adjust
the
regulating screw(3)
so
thatthe lost motion (play)
of
the needle bar holder in
the
arrowdirection
Is the smallest achievable one; rubbing must
not
occur.
Tighten the screw (2
).
12
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25 L at eral setting of needle stab position
26
-
-
-
-
Both dead centers of the needle lateral motion at the zigzag stitch sewing sh ould be at the same distance
from the throat plate needle ho le edges.
Dismantle the cover (1) and the hole stop (2) from the rear side.
Loosen
both screws (3 ).
3
Set the maximum zigzag stitch width and adjust the positions of the needle lateral motion dead centers
as pe r r egu lation.
Tighten both screws properly (3).
Lateral setting of central st raight stitch position 3 2
If the central straight stitch is set,the needle position should be
L
approximately in the center of the presser foot or in the middle
of
the throat plate needle ho le center.
Set the zero width ofthe zigzag stitch with the lever (1 ).
Loosen t he screws (2) .
Shift the lever (3) until
the needle shifts in the lateral direction to •
the throat pl ate needle hole center.
Tighten t
he screws (2).
13
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27 Lateral setting of st raight stitches on throat plate needle hole edges, arresting of zigzag stitch setting mechanism
If the sewing equipment a
llows using the maximum zigzag stitch width , which is characteristic of the particular mach ine type,
the position of the border straight stitches should be adjusted so that italigns with the zigzag stitch border. If the throat pla te
needle hole
is narrower than the maximum zigzag stitch wid th of the particular sewing machine t ype, the leverfor the pos it ion setting
of the borde r st i tch must be f ixed in the centr al position.
2 4 1 3
-+ Loosen the screw (1) and turn the lever (2) in the position, in which
the needlewill perform no lateral motion when turning the lever (3).
-+ Locate the stop (4) to the lever (2) and fix it with the screw (1 ).
-+ Loosen the screw (5) and turn the lever(2) to the position, in which
the needle performs no side motion when moving the lever (3).
-Locate the stop (6)
to the lever (2) and fix it with the screw (5).
-+ Adjust the arresting lever (7) in this position. Tighten the arresting
28
nut (8-invisible), loosen th e screw (9), turn the lever (7) to 1mm
space from
th e casing (10)and lighten the screw (9).
If the sewing equipment does not allow using the maximum
zigzag stitch width, screw the regulating screw
(1 1) into the lever
(2) and fix it in the central position.
The gap between hook assembly and needle adjustment
Adjustthe stitch forming width to zero and turning round the hand wheel towards the machine, when the needle
goes up 2mm from the lowest position, the position of needle hole should be lower 1.6mm than hook top. The
hook top position should be accordant with the centerline
of needle and the gap from hook top to needle slot
bottom should be 0.05mm.
0.05mm
14
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29 Bobbin case driver
The distance between the bobbin case driver and the bobbin case
groove bottom should be
(A )=0.7mm.
-Dismantle the throat plate and tiltthe machine.
-Loosen the screw (1).
-Shiftthe driver (2) to the distance (A)=0.7mm.
-+- Tighten the screw (1 ).
1
J.
2
30 The feed dog height adjustment (see below picture)
The height of feed dog should be higher 1.0mmthan needle plate. It is the standard for leaving factory.
The height
of feed dog can be adjusted to 0.8-1.2mm according to sewn material. To adjust it, turn pulley
Wheel to the highest position of feed dog, loosen the screw (2) of the lifting lever (8) on the shaft (6), adjust
it
to the required height of the feed dog and retighten the screw.
3 A
1 /
8
3
\ \2
31 The feed dog obliquity adjustment (see above picture)
6
The standard position of feed dog is horizontal. It can be adjusted according to sewn material. To adjust it, loosen
the screw (1)
of the feeding lever (9) on the shaft (7), adjust the rear part of feed dog by correspondingly adjusting
the position of eccentric pin (5), adjust it to the required height of the feed dog and retighten the screw.
15
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32
Timing between needle and feed dog motion (see below picture)
When needle pointA reaches needle plate top surface
B,
feed dog surface C should be keep accordant on height
with needle plate top surface. It is the standard synchronous relationship.Adjusting method as below:
-O
rientation
of
lifting feed dog cam: see picture, lean the machine head backward, loosen
sc
re
w (5), press lifting
feed dog cam (6), turn pulley lightly, retighten the screw (5) when the angle becomes 90° between the orientation
mark point
of
lifting feed cam with the groove
of
feed cam (7).
-Loosen the synchronous pulley screw
of
lower shaft, turn the pulley In machi
ne
rotation direction till the needlepoi
nt
mo
ve downward
to touch the
top
surface
of
needle plate. Then turn lower sha
ft
in machine rotati
on
direction, re
li
ghten
the
synchronous pull
ey
screw
when feed dog surface keep
ac
cordant
on
heightwith needle plate top surface.
A
-----1
t
33
The forward/backward stitch length error adjustment (see above picture)
-Adjust the f
o,wa
rd/backward stitch length error through to adjust the position of the backstitch bl
oc
k on backstitch connection shaft.
-Lean
the machine head backward, loosen backstitch block screw (1
).
At same time, press backstitch pin (3)
of
backstitch connection shaft (2)in order to avoid itfall
off
backstitch control levercrank (4).
-+
Bac~Jtch
length
w
in
be
increased
when
remove
backstitch
block
to
rtght,
and
It
wi
ll
be
decreased
when
remove
backsthch
bk>ck
to
right
,
and it
W'.11
be
decreased
!Nhen
remove
backstitch
block
10
lel'!
.
-Retighten backstitch block screw
(1
) after the adjustment is well.
34
The position between hook and opener moti
on
adjustment
-+
Lean
th
e
machine
head
backward,
screw
out
the
bottom
cover
screw
(1)
of
hook
saddle,
open
bottom
cover
(2).
-+-
Putthe needle bar to its lowest position.
-Loosen thread fingercam screw (3), adjustthread finger
cam
(4), make thre
ad
finger stte
on
the
nearest position of
hooK,
and then retighten th
re
ad finger cam screw.
-Loosen hook opener screw (5
),
adjust the distance between thread
finger and hook is 0.3-0.4mm.
16
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35
Form stitch
of
patterns cam series
The setting should be carried out in the sequence as described herein.
a
Tooth clearance setti
ng
of
form stitch gear
The tooth clearance
of
the form stitch gear should be as small as
possible. No overl
ap
instead of clearance, however, mayarise in any
mutual position of the gears.
Dismantle the top cover.
-T
um
the hand wheel 12times in intervals
of
approximately 1/3 revolution and
ascertain the tooth clearance, turning the steering cam (1) manually until the position
with the smallesttooth clearance is found.
, - Loosen the screws (2), turn the gear in the smallesttooth clearance
position, shiftthe cone scroll (3) to the right and set the toothclearance as small
as
possible. Tighten the screws (2).
-
Mo
unt the regulating ring (4) on touch with the scroll (3).
-Check the tooth clearance.
b Roller bolt position
of
form stitch steering cam
When changing the form stitch width, the stitch central axis should
remain
in
its
place.
It
should
not
sh
ift
laterally
.
-Mount
the wheel steering cam
of
the straight stitch (from the machine rear side) t
-Dismantle
t
he
cover
of
theform stitch width setting mechanism.
-Release
the bolt (1) position by tilting the lever
(2
) in yourselfdirection.
-Move
the bolt (1) in the arrow direction and watch whether
the
needle
is moving laterally. If yes, dismantle the steering cam, loosen the screw
(3) and try to tum the eccent
ri
c bolt (4) to a different position and test
whetherthe needle is changing its position. Repeat this until t
he
eccentric bolt (4)
position is found where the needle position does notchange. 3
-Tighten
the scr
ew
(3). 4
17
4
1
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C
Setting of needle stab position
If
the
wheel
steering cam
of
the straightstitch Is mounted, the ne
ed
le
shou
ld
be
loca
ted in
both
directi
ons
in center
of
the throat plate
needle
hole.
-
Adjust the needle position in feeding direction
as
per section 24
-Adjust the needle lateral position similarly
as
in
section
25
so
that
the
needleis located in theneedle hole center.
D Timing ofform stitch steering cam to needle motion
When sewing the form stitch, the needle should shift in the lateral
direction
at
the time when it is overthe sewn material.
-Dismantle the top cover.
-Mount any form stitch cam
(1
).
-Loosen 4 screws (2) and
tum
the scroll (3) tothe position where
the regulation is complied with. Putthe scroll (3)
on
touch with the
regulating ring (4) and fix it.
-Checkwhether the needle is without
any
motion
at
thetime
whe
n
it is stabbed in the sewn material and
ad
j
us
t the setting,
if
needed.
36 Form stitch
of
patterns cam with part number
N
O.
OF
STITCHES
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7020
0
060
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ti
ll~~
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PATTERNS
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NO.
OF
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t,
~1
70'.!0!i070
ST
ITCHES
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O~
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r.1
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rr
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t'
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i •
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18
From the library of Superior Sewing Machine & Supply LLC - www.supsew.com

37
Backtacklng with solenoid
At the maximum stitch length, at the backtacking mechanism
dislocation with the solenoid, its movable core should notstrike the fixed one .
Set the maximum stitch length.
Press the backtacking lever down to the stop and hold it inthis position.
Loosen
the screw (1 ), press the lever (2) down to the stop, and put it
back by approximately 1mm .
Tighten the screw (1 ).
2
-Test whetherits movable core does not strike the fixed one when
the solenoid is switched on.
38 Presserfoot lifting
A Manual foot lifting
Regulation
The
foot stroke with the hand levershould be 5.5mm.
-Place the bottom feed dog underthe level
of the throat plate top
surface.
Place an object of thickness 5.5mm underthe foot.
Loosen the screw(1), lift the hand lever (2), press the driver (3)
down
to the lever (2) and tighten the screw (1 ).
19
2 3 1
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