JUKI MF-7200D User manual

INSTRUCTION MANUAL
MF-7200D/UT42,45

i
CONTENTS
I. SPECIFICATIONS...........................................................................................................1
II.AT THE BEGINNING ......................................................................................................1
III. INSTALLING THE ACCESSORIES.............................................................................2
1. Installing the presser lifting cylinder (UT45) ..................................................................................... 2
2. Installing the air regulator (UT45) ...................................................................................................... 2
3. Installing the presser lifting solenoid (UT42) .................................................................................... 3
4. Installation and setting SC-921 ........................................................................................................... 4
(1) Table-mount type..........................................................................................................................................4
(2) Semi-sunken type.........................................................................................................................................4
(3) Connecting the cords...................................................................................................................................5
(4) Setting procedure of the machine head .....................................................................................................6
(5) Setting the lower stop position of the needle bar .....................................................................................7
(6) Setting of the auto lifter function ................................................................................................................8
IV. AIR PIPING DRAWING (UT45) ....................................................................................9
1. Piping of the thread trimmer device ................................................................................................... 9
2. Adjusting the air regulator................................................................................................................. 10
V. THREADING THE MACHINE HEAD..........................................................................11
1. Standard threading for the machine with automatic thread trimmer .............................................11
VI. ADJUSTING THE LOOPER THREAD TRIMMER MECHANISM...........................12
1. Adjusting the thread trimmer air cylinder (UT45)............................................................................ 12
2. Adjusting the looper thread trimmer solenoid (UT42) ................................................................... 12
VII. ADJUSTING THE THREAD RELEASE MECHANISM ..........................................17
VIII. ADJUSTING THE TOP COVERING THREAD TRIMMER MECHANISM (UT45) ...18
IX. ADJUSTING THE TOP COVERING THREAD TRIMMER MECHANISM (UT42) ..20
X. ADJUSTING THE AIR-BLOW WIPER (UT45)...........................................................21
1. Installing the air-blow wiper .............................................................................................................. 21
2. Adjusting the air-blow wiper ............................................................................................................. 21

– 1 –
I. SPECIFICATIONS
Model name Semi-dry head high-speed, small cylinder-bed coverstitch machine
Model MF-7200D series
Stitch type ISO standard 406, 407, 602, and 605
Example of application Hemming and covering for knits and general knitted fabrics
Max. speed of stitch Max. 4,000 sti/min (at the time of intermittent operation)
Needle gauge 3-needle ... 5.6 mm and 6.4 mm
2-needle ... 3.2 mm, 4.0 mm and 4.8 mm
Di󰀨erential feed ratio 1 : 0.8 to 1 : 1.8 (stitch length : less than 3.2 mm)
Micro-di󰀨erential feed adjustment mechanism is provided. (Micro-adjustment)
Stitch length 1.4 mm to 3.2 mm (can be adjusted up to 4.2 mm)
Needle UY128GAS #9S to #12S (standard #10S)
Needle bar stroke 31mm
Dimensions (Height) 450 x (Width) 444 x (Length) 285
Weight UT42 : 48kg, UT45 : 44kg
Lift of presser foot 6 mm (needle gauge : 5.6 mm without top covering), and 5 mm (with top covering)
Micro-lifter mechanism is provided.
Feed adjustment method Main feed ... dial type stitch pitch adjustment method
Di󰀨erential feed ... lever adjustment method (micro-adjustment mechanism is provided.)
Looper mechanism Spherical rod drive method
Lubricating system Forced lubrication method by gear pump
Lubricating oil JUKI MACHINE OIL 18
Oil reservoir capacity Oil gauge lower line : 600 cc to upper line : 900 cc
Installation Top mount type, Semi-submerged type
Noise - Equivalent continuous emission sound pressure level (LpA) at the workstation :
A-weighted value of 80.0 dB; (Includes KpA = 2.5 dB); according to ISO 10821- C.6.2 -ISO 11204
GR2 at 4,000 sti/min.
II. AT THE BEGINNING
❶
Remove xed band ❶for transportation before setting
up the sewing machine.

– 2 –
III. INSTALLING THE ACCESSORIES
1. Installing the presser lifting cylinder (UT45)
❶
❷
❸
❹,❼
❺
❻
❽
❾
2. Installing the air regulator (UT45)
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the
following work after turning the power o󰀨 and ascertaining that the motor is at rest.
1 - 2 mm
1) Install presser lifting cylinder asm. ❶to the sewing
machine with screws ❸, washers ❹and spring
washers ❼.
2) Tighten screw ❸in such manner that a clearance of
1 to 2 mm is provided between cap ❾at the top end
of presser lifting cylinder asm. ❶and presser lifting
lever ❷.
If the clearance cannot be adjusted to 1 to 2 mm,
adjust the height of nut ❽and cap ❾to obtain the
correct clearance between the cap and lever.
3) Adjust the height of screw ❺referring to the Instruc-
tion Manual for MF-7200D(VI-16.Adjusting the
presser foot lift), and tighten nut ❻.
4) Stroke of cylinder asm. ❶is 30 mm. Make sure that
presser lifting lever ❷comes in contact with screw
❺within the range of cylinder stroke.
1) Install pressure gauge ❺to regulator main body ❶.
2) Attach joint ❸to air intake port A, and joint ❹to
exhaust port B.
3) Install air regulator main body ❶under the table
with wood screw ❷.
❶
❷
❺
❹
❸
B
A

– 3 –
3. Installing the presser lifting solenoid (UT42)
1) Screw solenoid bracket pin ❶supplied as accesso-
ries in the tap located on the left side of the solenoid
installing section.
2) Adjust solenoid bracket pin ❶to solenoid bracket
pin hole ❸of presser lifting solenoid asm. ❷, and
set the presser lifting solenoid asm. When setting it,
insert the presser lifting solenoid asm. into the pin in
the state that it is twisted on the right-hand side.
3) When it is inserted into the pin, turn the presser lift-
ing solenoid asm. in the reverse direction, and x it
with screw ❹and washer ❺. Then install it on the
machine head with screw ❻, washer ❼and spring
washer ❽.
4) Referring to the Instruction Manual for MF-7200D
(VI-16. Adjusting the presser foot lift), adjust the
height of screw 󱢳, and tighten nut 󱢴.
5) Lower presser lifting lever ❾until it comes in contact
with screw 󱢳. Lower top end section 󱢵of presser
lifting solenoid asm. ❷to the lowest position, and
adjust with screws 󱢶(4 places) so that the clear-
ance between top end section 󱢵and presser lifting
lever ❾is 0 to 0.5 mm.
Sound of solenoid may increase during
using presser lifter. When it increases,
loosen 4 setscrews 󱢶, lower solenoid to the
place where the sound is lessened, and x 4
setscrews 󱢶. When adjusting, conrm that
presser lifting lever ❾comes in contact with
presser height adjustment screw 󱢳.
❶
❾
󱢳,󱢴
❻,❼,❽
0 - 0.5 mm
❹,❺
󱢵
󱢶
❷
❸

– 4 –
4. Installation and setting SC-921
(2) Semi-sunken type
1) Install control box mounting plate ❶on the SC-921 with four screws ❷.
2) Install the aforementioned assembly on backing plate ❹with four screws ❸.
❶
❷
❹
❸
(1) Table-mount type
* The instructions apply to the case the control box is installed on the table of the MF-7200D.
To use any other machine head, install the control box on the table referring to the Instruction Manual for
the main body of the relevant sewing machine.
1) Install control box ❷and sensor bracket ❸ on the table with tting bolt asm. ❶supplied with the unit as
accessories. At this time, insert supplied nuts and washers as shown in the gure so that the control box
and sensor bracket are securely xed.
2) Install the control box (or the one equipped with a small sized motor unit) on the table. Then, install the sew-
ing machine head on the table. (Refer to the Instruction Manual for the sewing machine.)
3) Install the mounting plate on the CP-18 panel with four tapping screws ❹supplied with the unit.
At this time, take care not to allow the cable to be caught under the mounting bracket.
4) Install CP-18 panel ❺and sensor bracket ❸on the table with wood screws ❻.
❶
❶
❷
❸
❻
❻
❺
❹
❻
Convex
washer
Spring
washer Hexagonal
nat

– 5 –
(3) Connecting the cords
3) Connect 14P code ❸coming
from the machine head to con-
nector ❻(CN36).
4) Insert 3P cord ❾coming from
the machine head into connec-
tor 󱢳(CN42).
5) When the optional AK device is
attached, connect 2P connector
❹coming from the AK device to
connector ❼(CN37).
6) Connect connector ❺coming from the motor to connector ❽(CN30) on the circuit board.
7) Insert pedal sensor cable 󱢴into connector 󱢵(CN34).
(Caution) 1. When using the AK device, set whether to use the AK device after conrming how to select the
auto-lifter function. (Refter to “(6) Setting of the auto lifter function” p. 8.)
2. Be sure to securely insert the respective connectors after checking the inserting directions since
all connectors have the inserting directions. (When using a type with lock, insert the connectors
until they go to the lock.) The sewing machine is not actuated unless the connectors are inserted
properly. In addition, not only the problem of error warning or the like occurs, but also the sewing
machine and the control box are damaged.
[Connecting the connector for the operation panel]
The connector for the operation panel is provided.
Paying attention to the orientation of the connector 󱢶,
connect it to connector (CN38) 󱢷located on the circuit
board. After connecting, securely lock the connector.
(Caution) Be sure to turn OFF the power before
connecting the connector.
1) Pass cords ❶of the thread trimming solenoid,
reverse-stitching solenoid, etc. and the cord from
the motor through hole Ain the table to route them
down under the machine table.
2) Loosen screw Bin cover ❷with a screwdriver to
open the cover.
❶ A
❷
B
❼
❹
❺
❽
❸
❻
❾
󱢵󱢳
󱢴
󱢷
󱢶

– 6 –
(Caution) For the operation panel other than CP-18, refer to the Instruction Manual for the operation panel to be
used for the setting procedure of the machine head.
❻
❺❹❸
❻
❺❹❸
❻
❺❹❸
(4) Setting procedure of the machine head
2) The type of machine head can be se-
lected by pressing switch
❺
(
switch
❻
).
* Refer to the "List of machine heads"
on the separate sheet or the Instruc-
tion Manual for the machine head of
your sewing machine for the type of
the machine head.
3) After selecting the type of machine
head, by pressing switch ❸(
switch ❹), the step proceeds to 96
or 94, and the display automatically
changes to the contents of the setting
corresponding with the type of ma-
chine head.
1) Call function setting No. 95.

– 7 –
Fig. 1
C
D
Call function setting No. 122. Check to be
sure that the lower stop position of the nee-
dle bar is as shown in Fig. 1. If not, adjust the
lower stop position of the needle bar properly
using function setting No. 122. (Adjustment
can be made within the range of ±15°).
❻
❺❹❸
(5) Setting the lower stop position of the needle bar

– 8 –
(6) Setting of the auto lifter function
1) Turn ON the power switch with
switch ❺held pressed.
2) "FL ON" is displayed on indicators
Ⓐ
and
Ⓑ
with a blip to make the auto lifter
function e󰀨ective.
3) Turn OFF the power switch, and turn
ON the power switch again to return to
the normal mode.
4) Repeat the operation 1) to 3), and
LED display is turned to (FL OFF).
Then, the function of auto-lifter does
not work.
❻
❺❹❸
❶Ⓑ
Ⓐ
❷❼
FL ON : Auto-lifter device becomes e󰀨ective. Selection of the auto-lifter device of solenoid drive (+33V) or of
air drive (+24V) can be performed with switch ❻.
(Changeover is performed to drive power +33V or +24V of CN37.)
FL OFF : Auto-lifter function does not work. (Similarly, the presser foot is not automatically lifted when pro-
grammed stitching is completed.)
Solenoid drive display (+33V) Air drive display (+24V)
(Caution) 1. To perform re-turning ON of the power, be sure to perform after the time of one second or more has
passed.
(If ON / OFF operation of the power is performed quickly, setting may be not changed over well.)
2. Auto-lifter is not actuated unless this function is properly selected.
3. When “FL ON” is selected without installing the auto-lifter device, starting is momentarily delayed
at the start of sewing. In addition, be sure to select “FL OFF” when the auto-lifter is not installed
since the touch-back switch may not work.
WARNING :
When the solenoid is used with the air drive setting, the solenoid may be burned out. So, do not mistake
the setting.
When the auto-lifter device (AK) is attached, this function makes the function of auto-lifter work.

– 9 –
IV. AIR PIPING DRAWING (UT45)
1. Piping of the thread trimmer device
1. Piping drawing with the needle thread trimmer.
⑪
③
④
⑨
①
②
⑩
⑨
⑩
⑪
󰽈
⑨
⑪
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the
following work after turning the power o󰀨 and ascertaining that the motor is at rest. In addition, cut the air
supply from air compressor.

– 10 –
2. Piping drawing for air blow.
③
④
⑥
①
󰽈
③
⑤
③
⑤
②
UT45
2. Adjusting the air regulator
❶
❷
❸A
󰽈
Air hose
1) Insert the air hose to air regulator ❶.
2) Use the air pressure at 0.4 to 0.5 MPa (4 to 5 kgf/
cm2).
3) Draw up regulator knob ❷, turn knob ❷ and adjust
the pointer to 0.4 to 0.5 MPa to adjust the air pressure.
4) After the adjustment, press downward regulator knob
❷.
5) When drainage is collected at section Aof regulator
❶during using, press drain cock ❸to discharge the
drainage.

– 11 –
V. THREADING THE MACHINE HEAD
1. Standard threading for the machine with automatic thread trimmer
Thread the machine head according to the following threading illustrations.
❷
* For the adjustment procedure other than the above, refer to the Instruction Manual for MF-7200D.
❷
❶
❶
A
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the
following work after turning the power o󰀨 and ascertaining that the motor is at rest. If threading is wrong,
stitch skipping, thread breakage, needle breakage or irregular stitches will be caused. So, be careful.
* Thread as shown with dotted line Awhen using
highly elastic thread.
* Thread as shown with dotted line Ain the case
the looper thread slips o󰀨 the looper thread
clamp of the thread trimmer.

– 12 –
VI. ADJUSTING THE LOOPER THREAD TRIMMER MECHANISM
❶
❷
❸
18 mm
1. Adjusting the thread trimmer air cylinder (UT45)
1) Stroke of air cylinder ❸is 18 mm.
When adjusting the stroke, loosen setscrew ❷of
collar ❶and move collar ❶to the right or left to ad-
just.
1) Stroke of looper thread trimmer solenoid ❸is 18
mm. When adjusting the stroke, loosen setscrew ❷
of collar ❶and move collar ❶to the right or left to
adjust.
❶
❷
❸
18 mm
2. Adjusting the looper thread trimmer solenoid (UT42)
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the
following work after turning the power o󰀨 and ascertaining that the motor is at rest. In addition, cut the air
supply from air compressor.(UT45)

– 13 –
2) After adjusting the stroke, loosen screw ❺from
the lower side, and move collar ❹to the left and
right to adjust so that the stroke becomes 18 mm,
same as that of the looper thread trimming solenoid.
When the magnet works, conrm that rubber seat ❼
comes in contact with UT base at the same time as
rubber cushion ❻comes in contact with the magnet
main body.
❼
❻
❺
❹
18 mm

– 14 –
5. Adjusting the position of clamp pressure
adjusting spring
1) Loosen screws ❾ and adjust the position of
clamp pressure adjusting spring 󱢵so that the
distance from the top end of clamp pressure ad-
justing spring 󱢵to section Aof upper knife 󱢳is
0.5 to 1 mm.
2) After the adjustment, tighten screws ❾.
6. Adjusting the pressure of clamp spring
1) Looper thread is held by clamp spring 󱢴after
thread trimming.
2) Holding pressure of the looper thread can be ad-
justed by turning screw ❽.
3) When screw ❽is turned clockwise, the holding
pressure is increased and turned counterclock-
wise, the pressure is decreased.
4) Make the holding pressure as low as possible
within the range of holding the looper thread.
4. Engaging the knives and adjusting the
clamp spring
1) Loosen screws ❼and ❽, and adjust the posi-
tion of upper knife 󱢳so that the engagement of
the upper knife 󱢳with the lower knife is 0.5 mm
when lower knife ❹moves to the extreme right.
2) At the same time, adjust so that the distance from
the top end of clamp spring 󱢴to that of lower
knife ❹is 3.2 mm.
3) After the adjustment, tighten screws ❼.
3. Adjusting the Lower knife
1) Set lower knife ❹and lower knife holder ❺with
setscrews ❻at the position of the illustration.
❹
❺
❻
65.5 mm
0.5 mm
❹
❽
󱢳
❼❾
󱢴󱢵
3.2 mm
SectionA
0.5 - 1 mm

– 15 –
7. Initial position of the lower thread
trimmer mechanism
When looper thread trimmer ❹is located at its left-
most position, the top end of the looper thread trim-
mer has to be spaced 22 ± 1 mm from the center of
needle bar.
8. Adjusting the stopper
Check the leftmost point with the pneumatic device
turned on. Adjustment should be carried out with the
air pressure set at 0.5 MPa.
Adjust the position of stopper 󱢻so that a clearance
of 0.3 to 1 mm is provided between looper 󱢾and
clamp spring 󱢺when the counter knife is located at
its leftmost position (forward end).
󱢻
When the needle is positioned at its upper dead
point, a clearance of 0 to 0.1 mm has to be provided
between the under surface of looper thread trimmer
❹and the top surface of looper 󱢾.
9. Adjusting the height of the lower knife
❹
󱢾
0 - 0.1 mm
Ⓐ
22±1 mm
❹
0.3 - 1 mm
󱢾
󱢺
Perform the work with the needle bar at the
highest position when actuating the thread
trimmer mechanism by hand.
Center of needle
bar

– 16 –
10. Adjusting the longitudinal position of
the blade point of lower knife
1) Bring the needle bar to its highest position.
2) Adjust so that the blade point of lower knife ❹
is in the center of the thickness of looper 󱢾
when the clearance between the right-hand
edge of looper 󱢾and the blade point of lower
knife ❹is 9 mm.
3) Loosen nut 󱢿, move lower knife holder ❺to
and fro, and adjust the position of the blade
point of lower knife ❹.
4) After the adjustment, tighten nut 󱢿.
Perform the work with the needle bar at the
highest position when actuating the thread
trimmer mechanism by hand.
❹
9 mm
❺
󱢿
󱢾
The safety switch is installed so that the sewing
machine does not start unless the lower thread
trimmer device returns to its home position.
1) Loosen setscrews 󱣂.
2) Adjust switch plate 󱣃so that LED of thread
trimmer sensor 󱣄lights up in the state that the
thread trimmer device is fully returned to its
home position.
3) Tighten setscrews 󱣂.
Perform the work with the needle bar at the
highest position when actuating the thread
trimmer mechanism by hand.
11. Adjusting the thread trimmer sensor
❸
❸
󱣄
󱣃
󱣂
󱣅󱣆
Speed of the lower thread trimmer device can be
changed with speed controllers 󱣅and 󱣆of air
cylinder ❸.
1) When you desire to change the protruding
speed of lower knife, loosen the nut of speed
controller 󱣅, and turn the adjustment screw.
When you desire to change the returning
speed of lower knife, loosen the nut of speed
controller 󱣆, and turn the adjustment screw.
2) After the adjustment, tighten the nuts of speed
controllers 󱣅and 󱣆.
･When the protruding speed of lower knife is
slow, thread trimming failure will be caused.
･When the returning speed of lower knife is
fast, lower thread clamp failure or uneven
needle thread remaining length will be
caused.
12. Adjusting the speed of lower thread
trimmer (UT45)
Blade point of lower knife is
in the center of thickness of
looper.

– 17 –
VII. ADJUSTING THE THREAD RELEASE MECHANISM
1. Adjusting the disk-rise
1) Loosen setscrew ❷ in adjustment cam ❶, turn
adjustment cam ❶and disk-rise plate ❸moves
up or down.
2) Adjust the clearance between the click section of
disk-rise plate ❸and thread tension disk ❹to 0.2
to 0.5 mm, and tighten setscrew ❷.
3) If the click section of disk-rise plate ❸comes in
contact with thread tension disk ❹, sewing trou-
ble will be caused. So, be careful.
2. Adjusting the thread release hook
1) Loosen setscrew ❺, adjust the dimension from
the top end of thread release rod ❻to the top
end of thread guide ❼to 33 to 36 mm, and tight-
en setscrew ❺.
2) Loosen setscrew ❾, move the position of thread
release hook ❽up or down, and the thread re-
maining length at the start of sewing can be ad-
justed.
When the thread remaining length at the start
of sewing is short, stitch skipping or slip-o󰀨
of thread from needle eyelet at the start of
sewing is apt to occur.
• When the position of thread release hook ❽is
raised, the thread remaining length at the start of
sewing is decreased and when it is lowered, the
thread remaining length at the start of sewing is
increased.
• If stitch skipping occurs at the beginning of sew-
ing when using non-elastic thread, properly ad-
just the remaining length of top-covering thread
at the start of sewing using setscrew 󱢳and
minimize the remaining length of looper thread at
the start of sewing using screw 󱢴.
33 - 36 mm
*A
Clearance between click and disk is 0.2 to 0.5 mm.
(5 places)
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the
following work after turning the power o󰀨 and ascertaining that the motor is at rest. In addition,
cut the air supply from air compressor. (UT45)
❶❷
❸
❹
❺
❻
❼
❽
❾
*A
󱢳
󱢴

– 18 –
1. Adjusting the engagement of knives
1) Adjust so that the engagement of xed knife ❶
with moving knife ❷is 0.5 mm.
2) When adjusting the engagement, loosen set-
screws ❹and move knife holder ❺up or down
to adjust.
2. Adjusting the pressure of clamp spring
1) Top covering thread is held with clamp spring ❸
after thread trimming.
2) Holding pressure can be adjusted by loosening
nut ❻and turning screw ❼.
3) Holding pressure is increased when tightening
screw ❼and it is decreased when loosening
screw ❼.
4) After the adjustment, tighten nut ❻.
5) Make the holding pressure as low as possible
within the range of holding the top covering
thread.
3. Adjusting the position of the blade
point of moving knife
1) Bring the needle bar to its highest position.
2) When hinge screw ❽is lowered, moving knife ❷
lowers together.
3) Adjust the moving knife to the position where the
hook section of moving knife ❷enters the con-
cave of the bottom surface of spreader ❾and
catches the top covering thread in the state that
moving knife ❷ is fully lowered. After the adjust-
ment, tighten screws 󱢳󱢴and 󱢵.
4) Screws
󱢵 are for adjusting vertical position of
the knife, screws 󱢳 for adjusting lateral position
of the knife, and screws 󱢴 for adjusting angle of
the knife.
VIII. ADJUSTING THE TOP COVERING THREAD TRIMMER MECHANISM (UT45)
Make sure that the moving knife does not
interfere with other components such as
presser, needle, spreader, etc. within the
working range of moving knife ❷.
0.5 mm
❶
❷❸
❹
❺
❻
❼
❽
Top covering thread
❾
󱢴
❷
󱢳
󱢵
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the following work after
turning the power o󰀨 and ascertaining that the motor is at rest. In addition, cut the air supply from air compressor.