JUKI Union Special MFC-7406 User manual

LIUKI
Finest Quality
2-3 Needle Cylinder Bed Coverseam Machine
MFC-7000A Series
REV.10/31/01
INSTRUCTION MANUAL
NOTE: Read safety instructions carefully and understand them
before using your MFC-7000.
Retain this Instruction Manual for future reference.
OP0113

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PREFACE:
This operator's manual has been prepared to guide you while operating the MFC-7000 Series machines.
This manual explains in detail the proper settings for operation of the machine. Illustrations are used to show the
adjustments and reference letters are used to point out specific items discussed.
Careful attention to the instructions and cautions for operating and adjusting these machines will enable you to
maintain the superior performance and reliability designed and built into every Union Special machine.
Adjustments andcautionsare presentedin sequence so that alogical progression is accomplished. Some adjustments
performed out of sequence may have an adverse effect on the function of the other related parts.
This manual has been comprised on the basis of available information. Changes in design and/or improvements may
incorporate a slight modification of configuration in illustrations or cautions.
On
the following pages will be found illustrations and terminology used in describing operating instructions for your
machine.
CONTENTS
PREFACE: .................................................................................................................................................................2
SAFETY RULES ..........................................................................................................................................................3
SPECIFICATIONS: ....................................................................................................................................................4
MOTOR PULLEY AND V BELT: ..................................................................................................................................4
TABLING INSTALLATION: ................................... .- ..................................................................................................... 5
CAUTION AREAS: ...................................................................................................................................................6
OPERATOR'S DAILY CHECK UST: .................................................................•........................................................... 7
ROTATION: ..............................................................................................................................................................7
OPERATING CAUTIONS: .........................................................................................................................................7
OPERATING CAUTIONS (CONT.): ..........................................................................................................................8
OPERATING THE PEDALS: .........................................................................................................................................8
LUBRICATION: .........................................................................................................................................................9
LUBRICATION (CONT.): ........................................................................................................................................ 10
INSERTING NEEDLES: ............................................................................................................................................. 11
THREADING THE MACHINE: ................................................................................................................................. 12
THREADING THE MACHINE (CONT.): ................................................................................................................... 13
DIFFERENTIAL FEED MECHANISM: ........................................................................................................................ 14
ADJUSTING THE STITCH LENGTH: ......................................................................................................................... 14
PRESSER FOOT PRESSURE AND LIFTER: ................................................................................................................. 15
ROLLER PRESSURE ADJUSTING KNOB: ................................................................................................................. 15
PULLER LIFTER LEVER: ............................................................................................................................................ 16
PULLER STIITCH LENGTH: ....................................................................................................................................... 17
ADJUSTMENT OF LOOPER GAUGE: ...................................................................................................................... 18
ADJUSTMENT OF NEEDLE BAR HEIGHT: ................................................................................................................ 18
ADJUSTMENT OF LOOPER AND NEEDLE: ............................................................................................................. 19
ADJUSTMENT OF NEEDLE GUARD: ....................................................................................................................... 19
ADJUSTMENT OF SPREADER: ................................................................................................................................ 20
ADJUSTING TAKE-UP CAM: .................................................................................................................................. 21
ADJUSTMENT OF THREAD GUIDE: ........................................................................................................................ 22
MAINTENANCE: .................................................................................................................................................... 23
2

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SAFETY RU LES
l. Before putting the machines described in this manual into service, carefully read the instructions. The starting
of each machine is only permitted after taking notice of the instructions and by qualified operators.
IMPORTANT! Before putting the machine into service, also read the safety rules
and inslruction from the motor supplier.
2. Observe the national safety rules valid for your country.
3. The sewing machines described in this instruction manual are prohibited from being put into service until it has
been ascertained that the sewing units which these sewing machines will be built into, have conformed with
the EC Council Directives (89/392/EEC, Annex II B).
Each machine is only allowed to be used as foreseen. The foreseen use of the particular machine is
described in paragraph "STYLES OF MACHINES" of this instruction manual. Another use, going beyond
the description, is not as foreseen.
4. All safety devices must be in position when the machine is ready for work or in operation. Operation
of the machine without the appertaining safety devices is prohibited.
5. Wear safety glasses.
6. In case of machine conversions and changes all valid safety rules must be considered. Conversions
and changes are made at your own risk.
7. The warning hints in the instructions are marked with one of these two symbols:
8. When doing the following the machine has to be disconnected from the power supply by turning off
the main switch or by pulling out the main plug:
8.1 When threading needle(s), looper, spreader etc.
8.2 When replacing any parts such as needle(s), presser foot, throat plate, looper, spreader, feed dog,
needle guard, folder, fabric guide etc.
8.3 When leaving the workplace and when the workplace is unattended.
8.4 When doing maintenance work.
8.5 When using
clutch motors without actuation lock, wait until the motor is stopped totally.
9. Maintenance, repair and conversion work (see item 8) must be done only by trained technicians or special
skilled personnel under consideration of the instructions.
l 0. Any work on the electrical equipment must be done by an electrician or under direction and supervision of
special skilled personnel.
11. Work on parts and equipment under electrical power is not permitted. Permissible exceptions are described
in the applicable sections of standard sheet DIN VDE 0105.
12. Before doing maintenance and repair work on the pneumatic equipment the machine has to be discon-
nected from the compressed air supply. In case of existing residual air pressure after disconnecting from
compressed airsupply (i.e. pneumatic equipment with airtank), the pressure has to be removed by bleeding.
3

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SPECIFICATIONS:
Style Name MFC-7406 MFC-7407 MFC-7602 MFC-7605
406 407 602 605
Stitch
Type
2 Needle Bottom 3 Needle Bottom 2 Needle
Top & Bottom 3 Needle
Top & Bottom
Cover Stitch Cover Stitch Cover Stitch Cover Stitch
Machine Speed 6500RPM (MAX)
Sewing Speed * 6500RPM (Texturized Thread)
Stitch Range 1.6 to 3.2 mm
Differential Ratio 1:0.3 - 1:2.4
Needle Spacing 3.2 4.0 4.8 5.6 6.4 3.2 4.0 4.8 5.6 6.4
Needle 128GBS075/032 (055/022 -090/036)
Presser Foot Lift 7.0mm
Needle Bar Stroke 32mm
Lubricating Oil Prorex oil 39 (Part Number 28604R, Union Special Spec. 175) 1 Pint
Noise 87.2dBA max. (at 6500 RPM)
* Maximum speed depends on thread and material.
MOTOR PULLEY AND V BELT:
50Hz 60Hz
Sewing Speed
(RPM) Motor Pulley V Belt (inches) Motor Pulley V Belt (inches)
O.D. (MM) Non-submerge
O.D. (MM) Non-submerge
6500 145 43 120 41
6000 135 43 110 41
5500 120 41
100 41
5000 110
41
90 39
4500
95
41
80 39
4000 85 39 70 39
3500
75 39 60 38
1. Use a M type V belt.
2. The table on the left shows the sewing speeds obtained by the use of motor pulleys with different diameters
and V belts with different lengths.
3. Note that the effective diameter of the pulley of the sewing machine head is 57.5mm.
4. Use JUKI Clutch motor (400w).
4

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TABLING INSTALLATION:
(l) NON SUBMERGE FOR STANDARD
(PART NUMBER 21371ZJ48)
(2) NON SUBMERGE FOR ELASTIC
(PART NUMBER 21371AAJ48)
5
9
I
I
I
C) I
~
=
9
I
I

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CAUTION
AREAS:
~
CAUTION
6

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OPERATOR'S DAILY CHECK LIST:
The following should be checked daily and cleaned as required when it applies to yourJuki Union Special machine:
•Oil flow
•Oil level
ROTATION:
OP026-94
OPERATING CAUTIONS:
•Lint area (clean with compressed air or brush) •
Cooling airways
• •
Needle bar bushings • •In the machine
• •Under feed dogs & throat plates • •In
the motor
• •In knives
••In thread control eyelets • •In
the cooling package
(package is an extra send charge)
The correct rotating direction of
the handwheel is clockwise, as
viewed from the handwheel's
side. NEVER run the machine in
reverse direction.
V BELT
1. Do not put your hand under the 2. Do not put your hand into the 3.
Turn off the power switch and
make sure the clutch motor is
at rest before removing the V
belt.
needles when turning on the sewing area while the machine
power switch or at any time. is running.
7

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OPERATING CAUTIONS (CONT.):
4. During operation, do not allow head, hands or any instrument, tool etc. near handwheel, V belt and motor.
5. Do not operate your machine without the proper belt guard, sewing guards or any otherprotectors that have
been provided. Doing so is very dangerous.
6. Before inspecting, adjusting, cleaning, threading the head or replacing needles, turn OFF the power switch.
Make sure the flywheel on the motor hasstopped, itwill be kept running by inertia afterturning OFF the power
switch. DO NOT depress the foot pedal while the motor is running or itwill cause the machine to rotateabruptly.
7. Turn OFF the power switch when you leave your machine or in case of a power failure.
8. Do not wipe the machine surface with lacquer thinner.
OPERATING THE PEDALS:
0
0
0
A
C
D
00 0 0 I IUl!lr--- •--,1 :
1. Locate the center of drive treadle (A) to be in line with the needles.
2. Locate presser lifter pedal (B) for operator comfort and make sure
lifter
chain is unobstructed.
3. Use S-shaped hook (C) to connect presser lifter pedal chain (D) to
presser lifting lever (E). Depending on application.
8

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LUBRICATION:
D UPPER LEVEL
LINE
LOWER LEVEL
LINE
C
0
The oil should be between the two red lines in sight gauge (B) when the machine is at rest.
1. If oil is required remove oil cap (A).
0
2. Fill between lines (B) with Union Special Specification 175 oil (Union Special Part No. 28604R).
& CAUTION:
Do not exceed the upper red marker line. Excessive oil in the machine will result in oil
leakage and possible overheating.
3. To drain oil reservoir, remove oil drain cap (C) on the underside of the machine.
4. To ensure oil flow through machine, check oil flow window (D).
9

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LUBRICATION (CONT.):
Lubrication of Needle Tip Dipper
*(Optional, extra send charge item)
A
1. Open cloth plate and well cover (A), fill well (B) approximately 80% full with silicone oil.
2. The back of the needles should just touch the front of felt (C).
3. If adjustment is necessary loosen screw (D) and move dipper as required.
4. Saturate silicone oil into felt (C) if the machine is started immediately after lubricating needle tip dipper.
lO

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INSERTING NEEDLES:
A
The standard needle is 128GBS, needle range sizes" 055/022 - 090/036."
Insert needles according to the following procedure:
1. Bring needle head (A) to the highest position.
2. Loosen screws (B), insert needles into holes. The needle scarf should face rearwards as viewed from
the operator's side.
3. Retighten screws (B).
11

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THREADING THE MACHINE:
&
Turn off main power switch before threading! When using clutch motors without actuation lock wait until
the motor has completely stopped .
.
Thread the machine according to the following threading illustrations.
NOTE: When threading two needle machines use needles "A" & "C".
A Left Needle Thread
(D
Thread Lubricator Area
B Middle Needle Thread ®
Needle Thread Eyelet Area
C Right Needle Thread @
Needle Bar Area
D
Spreader Thread @ Thread Nipper,
Spreader Area
E LooperThread @ Thread Take-Up
Area
NOTE: When threading two needle machines use needles "A" & "C", DO NOT use needle "B".
12

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THREADING THE MACHINE (CONT.):
A
Twisted Thread
When
the needle thread lubricator is used:
1. Saturate felt (A).
2. Pass thread over felt.
When
the needle thread lubricator is not used:
1. Remove felt (A).
Non-TwistThread
13
CAUTION!
Whenusing an untwistedthreadsuch
as wooly nylon thread or weak
thread, do not wind it around the
immediate thread guide.

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ADJUSTING THE STITCH LENGTH:
Turn off main power switch before setting the stitch
length! When using clutch motors without actuation
lock wait until the motor has completely stopped.
1. Locking feature may be engaged, refer to Engineer's Manual
EN9424.
2. To change stitch length push down on stitch regulator button (A)
and rotate handwheel in appropriate direction.
Clockwise to increase the stitches per inch/shorten the length of
one stitch.
oo©
-- ---------- -----
Counterclockwise to decrease stitches per inch/increase the length of one stitch.
3. The arrows on the belt cover are for operator's reference only.
DIFFERENTIAL FEED MECHANISM:
1. Turn knob (A) to change the travel of the differential feed dog.
Clockwise to decrease the stitches per inch/increase the length
of one stitch.
Counterclockwise to increase stitches per inch/decrease the
length of one stitch.
14

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PRESSER
FOOT
PRESSURE
AND
LIFTER:
ROLLER
PRESSURE
ADJUSTING
KNOB:
1.
Adjust presser
foot
pressure
by
loosening
nut
(A)
and
turning presser
foot
adjustscrew
(B)
clockwise
to
increase
the
pressure,
counterclockwise
to
decrease
the
pressure.
2.
Retighten
nut
(A).
1.
To
adjust
the
pressure for
the
puller
drive
roller assembly
turn
adjusting
screw (A)
clockwise
to
Increase
the
pres-
sure,
counterclockwise
to
decrease
the
pressure.
15

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PULLER LIFTER LEVER:
l . To engage puller roller to material, push lifter lever (A) away from the operator.
2. To disengage puller roller to material, pull lifter lever (A) towards the operator.
16

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PULLER STIITCH LENGTH:
1. Moving lever (A) towards or away from operator to set stitch length of puller.
• Set closer to operator for short stitches.
•Set farther away from operator for longer stitches.
2. Loosen nut (B) and move lever (A) as needed to obtain proper stitch length.
A
17

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ADJUSTMENT OF LOOPER GAUGE:
Turn off main power switch before setting the stitch length! When using clutch motors without
actuation lock wait until the motor has completely stopped.
1. Set the looper gauge to be 4.8mm +O. 1 mm.
A
ADJUSTMENT OF NEEDLE BAR HEIGHT:
1. When looper moves to the left side, adjust the tip of the looper so that it comes to the position located
past the left needle by 0.5 +O.Smm.
2. Remove face cover and loosen screw (B). Then adjust needle bar to the position where the lower part
of looper is aligned to the upper part of the eye of the needle on the left side.
(Caution)
After adjustment, confirm that the direction of needle head is correctly set and the respective needles
align into the center of the holes of the throat plate.
Oo5
Move to the
I ef't to a I i gn
~
A I 1gn
m
Lef't needle
Looper
18

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ADJUSTMENT OF LOOPER AND NEEDLE:
Turn handwheel in operating direction until tip of looper is in scarf of left needle. Loosen screw (A) and move looper
base back and forth so that the clearance between the tip of looper and the scarve of left needle is O to 0.05mm.
Left Needle
A
Tip of looper
Oto 0.05mm
~ Looper
Oto0.05mm~<:..:..._
Needle
ADJUSTMENT OF NEEDLE GUARD:
1) Adjusting the height of rear needle guard
• Loosen screw (C) and move rear needle guard up and down so that the tip of needle comes to the
height of 1 /2 of the end part of rear needle guard (D) when the blade point of looper is aligned with
the right side of right needle.
2) Adjusting front to back of rear needle guard
Loosen screw (E) and Adjust the rear needle guard so when the looper reaches the right needle, there
is O- .05mm between the needle and the looper point. Use the rear guard to push the right and middle
needle forward slightly. The rear guard should touch but not deflect the left needle.
(Caution)
1. Confirm that the blade of looper does not touch the scarves of all needles.
2. When tightening screw (E), confirm that there is no .shake left and right .of rear needle guard.
3) Adjusting the height of front needle guard
• Loosen screw (F) and move front needle guard(G) up and down so that it comes 1.75mm from the lower
part of looper blade. At this time, also loosen screw (H) and adjust so that clearance of 0.25mm is
provided in parallel between the angle of front needle guard and all needles.
0
G
F
~ 112
C
.:· ........ _ :<·: .·.: '. :/
-·~·-._·._, .. -·- ...
. ,•· ::
.
.
.
.... - E
. " H
-------- -- -
I. 75mm
rLOOPER
j 4 I
~ FRONT NEEDLE
u GUARD
NEEDLES
FRONT NEEDLE
Align¢=, No contact~
--------f ~- - .
0.25mm GUARD
Contact surface of Pushing amount
rear needle guard 0 to 0.1 mm
19

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ADJUSTMENT
OF
SPREADER:
K
DescendJ
-+
Return
R
0
r-------10.5-0.smm
Spreader
Align
the
groove
of
the
left
side
of
fixing
spreader
thread
guide
-+Return
Fixing spreaderthread guide
Needle head
spreader
thread
guide
N
4.0mm
l)
Adjusting
stroke
•
Adjust
stroke
by
19mm
by
loosening
nut
(L)
and
moving
(M)
back
and
forth.
(If
you
move
(M)
toward
you
the
stroke
will
be-
come
short,
and
the
stroke
will
become
longer
if
you move
it
backward.)
2)
Adjusting
the
position
of
spreader
•
Adjust
the
height
of
spreader
to
be
l 0.5
-0.5mm
after.loosening
screw
(N).and
move
spreader
(P)
up
and
down.
• Adjust
so
that
when
spreader
is
located
at
the
extreme
left,
loosen
screw (N)
and
move
spreader
(P)
back
and
forth.
And
when
spreader
moves
from
the
left
to
the
right
a
clearance
of
0.3
to
0.5mm
is
provided
between
spreader
and
left
needle.
• The
extreme
left
position
of
spreader
is
adjusted
to
5.5
+/-0.
l
3mm
from
the
center
of
left
needle
to
the
tip
of
spreader
by
loosening
screw
(R)
and
moving
spreader
left
and
right.
NOTE:
It
may
be
necessary
to
loosen
both
screws (N)
and
(R)
simultaneously
to
obtain
the
proper
front
to
back
and
left
to
right
settings.
3)
Adjusting
fixed
spreader
thread
guide
•
Loosen
screw
(S)
when spreader
is
in
the
ex-
treme
right
position.
And
adjust
the
fixed
spreader
thread
guide
where
-the
tip
of
spreader
and
the
top
part
of
the
groove
of
fixed
spreader
thread
guide
(T)
meet.
• Then
loosen
screw
(5)
and
adjust
the
height
from
the
top
of
spreader
to
the
underside
of
the
fixed
spreader
thread
guide
(T)
to
be
0.4
to
0.8mm.
4) Adjusting
needle
head
spreader
thread
guide
20
• Loosen
screw
(U)
and
adjust
needle
head
spreader
thread
guide
so
that
a
clearance
of
4.0mm
is
provided
between
the
upper
part
of
fixed
spreader
thread
guide
and
needle
head
spreader
thread
guide
at
lowest
point
of
needle
bar,
and
center
of
needle
head
spreader
thread
guide
over
the
left
side
of
the
groove
of
fixed
spreader
thread
guide
(V).