JUKI AMS-221EN/IP-420 User manual

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ENGLISH
AMS-221EN / IP-420
INSTRUCTION MANUAL
* "CompactFlash(TM)" is the registered trademark of SanDisk Corporation, U.S.A.

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CONTENTS
!.
MECHANICAL SECTION (WITH REGARD TO THE SEWING MACHINE) ... 1
1. SPECIFICATIONS ........................................................................................................1
2. CONFIGURATION ........................................................................................................2
3. INSTALLATION ............................................................................................................3
3-1. Removing the bed xing bolt.........................................................................................................3
3-2. Adjusting the safety switch............................................................................................................3
3-3. Installing the throat plate auxiliary cover .....................................................................................4
3-4. Installing the panel..........................................................................................................................6
3-5. Installing the thread stand .............................................................................................................6
3-6. Raising the machine head..............................................................................................................7
3-7. Installing the air hose .....................................................................................................................8
3-8. Cautions for the compressed air supply (source of supply air) facility ....................................9
3-9. Installing the eye protection cover..............................................................................................10
4. PREPARATION OF THE SEWING MACHINE ...........................................................10
4-1. Lubrication.....................................................................................................................................10
4-2. Attaching the needle..................................................................................................................... 11
4-3. Threading the machine head ....................................................................................................... 11
4-4. Installing and removing the bobbin case ................................................................................... 11
4-5. Installing the bobbin.....................................................................................................................12
4-6. Adjusting the thread tension .......................................................................................................12
4-7. Intermediate presser height.........................................................................................................13
4-8. Adjusting the thread take-up spring ...........................................................................................13
5. OPERATION OF THE SEWING MACHINE................................................................14
5-1. Sewing............................................................................................................................................14
5-2. Needle thread clamp device.........................................................................................................15
5-3. Adjusting the intermediate stop position of the feeding frame (left)
(For the separately-driven feeding frame with a double-stepped stroke function) ......................... 17
5-4. How to use the plastic blank (supplied with the machine as an accessory) (For the
separately-feeding frame with a double-stepped stroke function) ............................................ 17
@.OPERATION SECTION (WITH REGARD TO THE PANEL)..................... 18
1. PREFACE ...................................................................................................................18
2. WHEN USING IP-420 .................................................................................................22
2-1. Name of each section of IP-420 ...................................................................................................22
2-2. Buttons to be used in common ...................................................................................................23
2-3. Basic operation of IP-420 .............................................................................................................24
2-4. LCD display section at the time of sewing shape selection ..................................................... 26
(1) Sewing shape data input screen.................................................................................................. 26
(2) Sewing screen .............................................................................................................................28
2-5. Performing sewing shape selection............................................................................................30
2-6. Changing item data.......................................................................................................................32
2-7. Checking pattern shape ............................................................................................................... 34
2-8. Performing modication of needle entry point .......................................................................... 35
(1) Editing the thread tension ............................................................................................................35
(2) Editing the intermediate presser height .......................................................................................36
2-9. How to use temporary stop..........................................................................................................37

(1) To continue performing sewing from some point in sewing ......................................................... 37
(2) To perform re-sewing from the start.............................................................................................38
2-10. When setting of sewing product is difcult because of interruption of needle tip .................... 39
2-11. Winding bobbin thread ...............................................................................................................40
(1) When performing winding bobbin thread while performing sewing ............................................. 40
(2) When performing winding bobbin thread only ............................................................................. 40
2-12. Using counter..............................................................................................................................41
(1) Setting procedure of the counter .................................................................................................41
(2) Count-up releasing procedure .....................................................................................................43
(3) How to change the counter value during sewing .........................................................................43
2-13. Performing new register of users’ pattern................................................................................44
2-14. Naming users’ pattern ................................................................................................................45
2-15. Performing new register of pattern button............................................................................... 46
2-16. LCD display section at the time of pattern button selection ..................................................47
(1) Pattern button data input screen.................................................................................................. 47
(2) Sewing screen .............................................................................................................................49
2-17. Performing pattern button No. selection .................................................................................. 51
(1) Selection from the data input screen ...........................................................................................51
(2) Selection by means of the shortcut button................................................................................... 52
2-18. Changing contents of pattern button........................................................................................53
2-19. Copying pattern button ..............................................................................................................54
2-20. Changing sewing mode..............................................................................................................55
2-21. LCD display section at the time of combination sewing.........................................................56
(1) Pattern input screen..................................................................................................................... 56
(2) Sewing screen .............................................................................................................................58
2-22. Performing combination sewing ...............................................................................................60
(1) Selection of combination data...................................................................................................... 60
(2) Creating procedure of the combination data................................................................................ 61
(3) Deleting procedure of the combination data ................................................................................62
(4) Deleting procedure of the step of the combination data .............................................................. 62
2-23. Using the simple operation mode ............................................................................................. 63
2-24. LCD display when the simple operation is selected................................................................64
(1) Data input screen (individual sewing) ..........................................................................................64
(2) Sewing screen (individual sewing)...............................................................................................67
(3) Data input screen (combination sewing)...................................................................................... 70
(4) Sewing screen (combination sewing) ..........................................................................................72
2-25. Changing memory switch data..................................................................................................74
2-26. Using information .......................................................................................................................75
(1) Observing the maintenance and inspection information.............................................................. 75
(2) Releasing procedure of the warning ............................................................................................76
2-27. Using communication function .................................................................................................77
(1) Handling possible data ................................................................................................................77
(2) Performing communication by using the media........................................................................... 77
(3) Performing communication by using USB ...................................................................................77
(4) Take-in of the data ....................................................................................................................... 78
(5) Taking in plural data together....................................................................................................... 79
2-28. Performing formatting of the media.......................................................................................... 81
2-29. Operation at the time of X/Y motor position slip......................................................................82
(1) When the error is displayed during sewing.................................................................................. 82
(2) When the error is displayed after end of sewing.......................................................................... 83
(3) When the rest switch is not displayed.......................................................................................... 83
ii

3. MEMORY SWITCH DATA LIST..................................................................................84
3-1. Data list ..........................................................................................................................................84
3-2. Initial value list .............................................................................................................................. 90
4. ERROR CODE LIST ...................................................................................................92
5. MESSAGE LIST .........................................................................................................99
#. MAINTENANCE OF SAWING MACHINE .............................................. 102
1. MAINTENANCE........................................................................................................102
1-1. Adjusting the height of the needle bar (Changing the length of the needle) ........................ 102
1-2. Adjusting the needle-to-shuttle relation ................................................................................... 102
1-3. Adjusting the height of the feeding frame ................................................................................ 104
1-4. Adjusting the vertical stroke of the intermediate presser....................................................... 104
1-5. The moving knife and counter knife..........................................................................................105
1-6. Needle thread clamp device....................................................................................................... 106
1-7. Thread breakage detector plate ................................................................................................106
1-8. Replenishing the designated places with grease ....................................................................107
(1) Location where exclusive grease is provided ............................................................................108
(2) Points to be applied with JUKI Grease A................................................................................... 108
(3) Points to be applied with JUKI Grease B................................................................................... 110
1-9. Draining waste oil ....................................................................................................................... 112
1-10. Amount of oil supplied to the hook......................................................................................... 112
1-11. Replacing the fuse .................................................................................................................... 112
1-12. Changing the voltage of 100,/200V..................................................................................... 113
1-13. Troubles and corrective measures (Sewing conditions)....................................................... 114
2. OPTIONAL................................................................................................................ 116
2-1. Table of Needle hole guide......................................................................................................... 116
2-2. Silicon oil tank ............................................................................................................................ 116
2-3. Bar code reader........................................................................................................................... 117
iii

– 1 –
1. SPECIFICATIONS
!. MECHANICAL SECTION (WITH REGARD TO THE SEWING MACHINE)
1 Sewing area X (lateral) direction Y (longitudinal) direction
AMS-221EN-2516 : 250 mm × 160 mm
AMS-221EN-3020 : 300 mm × 200 mm
2 Max. sewing speed 2,800 sti/min (When sewing pitch is 3.5 mm or less)
3 Stitch length 0.1 to 12.7 mm (Min. resolution : 0.05 mm)
4 Feed motion of feeding frame Intermittent feed (2-shaft drive by stepping motor)
5 Needle bar stroke 41.2 mm
6 Needle GROZ-BECKERT 134, 135x17, ORGAN needle DPx5, DPx17
7 Lift of feeding frame Max. 30mm
8
Intermediate presser stroke 4 mm (Standard) (0 to 10 mm)
9 Lift of intermediate
presser
20 mm
10 Intermediate presser
DOWN position variable
Standard 0 to 3.5 mm (Max. 0 to 7.0 mm)
11 Shuttle Double-capacity semi-rotary hook
12 Lubricating oil New Defrix Oil No. 2 (Supplied by oiler)
13 Memory of pattern data Main body, Media
• Main body : Max. 999 patterns (Max. 50,000 stitches/pattern)
• Media : Max. 999 patterns (Max. 50,000 stitches/pattern)
14 Temporary stop facility Used to stop machine operation during a stitching cycle.
15 Enlarging / Reducing
facility
Allows a pattern to be enlarged or reduced on the X axis and Y axis independently
when sewing a pattern. Scale : 1% to 400% times (0.1% steps)
16 Enlarging / Reducing
method
Pattern enlargement / reduction can be done by increasing / decreasing either stitch
length or the number of stitches. (Increasing/decreasing stitch length only can be
performed when pattern button is selected.)
17 Max. sewing speed
limitation
200 to 2,800 sti/min (Scale : 100 sti/min steps)
18 Pattern selection facility Pattern No. selection method
(Main body : 1 to 999, Media : 1 to 999)
19 Bobbin thread counter UP/DOWN method (0 to 9,999)
20 Sewing counter UP/DOWN method (0 to 9,999)
21 Memory back-up In case of a power interruption, the pattern being used will automatically be stored in
memory.
22 2nd origin setting facility Using jog keys, a 2nd origin (needle position after a sewing cycle) can be set in the
desired position within the sewing area. The set 2nd origin is also stored in memory.
23 Sewing machine motor Servo-motor
24 Dimensions AMS-221EN-2516 : 1,200mm (W) x 1,000mm (L) x 1,200mm (H) (Excluding thread stand)
AMS-221EN-3020 : 1,200mm (W) x 1,070mm (L) x 1,200mm (H) (Excluding thread stand)
25 Mass (gross mass) AMS-221EN-2516 : 201 kg
AMS-221EN-3020 : 210 kg
26 Power consumption 700 VA
27
Operating temperature
range
5˚C to 35˚C
28
Operating humidity range 35 % to 85 % (No dew condensation)
29 Line voltage Rated voltage ±10% 50 / 60 Hz
30 Air pressure used AMS-221EN-2516 : 0.5 to 0.55 MPa (Max. 0.55 MPa)
AMS-221EN-3020 : 0.35 to 0.4 MPa (Max. 0.55 MPa)
31 Air consumption 1.8 dm3 / min (ANR)
32 Needle highest position
stop facility
After the completion of sewing, the needle can be brought up to its highest position.
33 Noise - Equivalent continuous emission sound pressure level (LpA) at the workstation:
A-weighted value of 85 dB; (Includes LpA = 2.5 dB); according to ISO 10821- C.6.3
-ISO 11204 GR2 at 2,800 sti/min.
- Sound power level (LwA);
A-weighted value of 94 dB; (Includes KwA = 2.5 dB); according to ISO 10821- C.6.3
-ISO 3744 GR2 at 2,800 sti/min
Time required for sewing: 2.2 sec, using Pattern No. 102

– 2 –
Air regulator
2. CONFIGURATION
1Machine head
2Wiper switch
3Temporary stop switch
4Feeding frame
5Intermediate presser
6Thread stand
7Operation panel (IP-420)
8Power switch
(also used as the emergency stop switch)
9Control box
!0Foot pedal
1
2
3
4
6
7
8
9
!0
5

– 3 –
3. INSTALLATION
1
2
Remove bed xing bolt 1. This bolt is necessary
to transport the sewing machine.
In case error 302 occurs when the sewing machine
works after setup, loosen the safety switch tting
screw with a screwdriver, and lower the switch 2
to the downside of the sewing machine.
3-1. Removing the bed xing bolt
3-2. Adjusting the safety switch

– 4 –
3-3. Installing the throat plate auxiliary cover
1) Move the cloth feed base to the rear,
and place throat plate auxiliary cover
3from between lower plate 1and
throat plate 2. At this time, be careful
not to bend lower plate 1.
2) Temporarily x throat plate auxiliary
cover 3 with throat plate auxiliary
cover setscrew 5and washer 4.
3) Temporarily x throat plate auxiliary
cover support 6to the machine bed
with setscrews (M6) 7.
4) Fix the throat plate auxiliary cover to
the bed with two oval counter-sunk
screws 8.
5) Refer to the items of the caution, per-
form positioning of the throat plate aux-
iliary cover, and x setscrews 5and
7. When the positioning is not enough,
loosen setscrews 9and !0 once, and
perform the positioning.
!0
3
8
6
7
2
1
9
45
1. The stay and the like are set to the throat plate auxiliary cover and the tting screws and
washers to the bed are packed together with the accessories at the time of delivery.
2. When using the cover sheet supplied as accessories, paste it to the throat plate auxil-
iary cover before installing.
[When using area 2516]

– 5 –
3
3
2
Within 0.3 mm 3
1. Fix the throat plate auxiliary
cover 3 so that is higher
than the throat plate 2 (within
0.3 mm). When it is lower than
the throat plate 2, needle
breakage or the like due to the
defective feed will be caused.
2. Conrm by putting a ruler or
the like that the throat plate
auxiliary cover 3 is horizon-
tally installed. If not, throat
plate auxiliary cover 3and
lower plate 1come in contact
partially with each other, and
abnormal worn-out will be
caused.
3
7
6
2
1
9
45
8
0.8 to 1.0mmto 1.0mm1.0mm
1) Move the cloth feed base to the rear, and
place throat plate auxiliary cover (asm.)
3from between lower plate 1and
throat plate 2. At this time, be careful not
to bend or damage lower plate 1.
2) Temporarily x throat plate auxiliary
cover (asm.) 3with throat plate auxil-
iary cover setscrew 5and washer 4.
3) Temporarily x throat plate auxiliary
cover (asm.) 3to the machine bed
with throat plate auxiliary cover support
setscrews 6(10 pcs.).
4) Fix throat plate auxiliary cover (asm.)
3to the machine bed with two coun-
ter-sunk screws 7.
5) Move the cloth feed base to the left
front, move up and down throat plate
auxiliary cover (asm.) 3so that a dis-
tance of 0.8 to 1.0 mm is provided be-
tween the bottom surface of lower plate
installing base 8and the top surface
of throat plate auxiliary cover (asm.) 3,
and x setscrews 6.
6) Perform the similar work by moving the
cloth feed base to the right front.
7) Fix throat plate auxiliary cover setscrew 5.
8) Referring to the caution below, perform
positioning of the throat plate auxiliary
cover. When the positioning is not per-
formed enough, perform the positioning
after loosening once throat plate auxil-
iary cover setscrew 5and throat plate
auxiliary cover base setscrews 9.
[When using area 3020]

– 6 –
1
2
3-5. Installing the thread stand
1) Assemble the thread stand, and put
it in the hole in the top left corner of
the machine table.
2) Tighten locknut 1 to x the thread
stand.
3) When ceiling wiring is possible, pass
the power cord through spool rest
rod 2.
3-4. Installing the panel
1) Open cover 1and remove cable 2once.
Then connect it again to the panel on the top
surface of the table after passing it through the
hole in the table.
2) Fix operation panel installing plate 3to an op-
tional place on the table with two wood screws
4.
Install the panel at the position where
X-move cover or head grip does not
interfere with it since breakage of the
panel will be caused.
1) Installing the IP-420
2
1
3
4

– 7 –
3-6. Raising the machine head
WARNING :
Tilt/raise the sewing machine head with both hands taking care not to allow your ngers to be
caught in the head.
Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of
the sewing machine.
[When using area 2516]
To carry out work with the sewing machine raised,
follow the steps of procedure described below.
1. Move feeding fame
3
to the rightmost position and
x it there. Then mount machine head grip
1
sup-
plied with the unit by fully screwing it into position.
2. Holding machine head grip
1
, lift the sewing ma-
chine in the direction of the arrow until the mainte-
nance position (where machine head support
2
comes in contact with the table) is reached.
• If a 20 kg or more load is necessary to
be applied to the position of machine
head grip
1
in order to lift the machine
head, gas spring
5
has outgassed. Be
sure to replace the gas spring with a
new one.
• While raising the sewing machine, gas
spring
5
works to move the sewing
machine in the direction of the arrow
when the sewing machine is inclined
by approximately 45 degrees of an
angle with respect to the table. It is
therefore necessary to lift the sewing
machine until the maintenance position
is reached while supporting the sewing
machine with both hands.
6
5
4
3
1
2
Maintenance position of the sewing machine
3. Turn stopper release lever 6in the direction of
the arrow to secure the sewing machine.
Never operate stopper release lever 6
at any position other than the main-
tenance position so as not to allow
your hand or other part of body to be
caught between the sewing machine
and the table.

– 8 –
3-7. Installing the air hose
1
2Close
Open
1) Connecting the air hose
Connect the air hose to the regulator .
2) Adjustment of air pressure
Open air cock 1, pull up and turn air adjust-
ment knob 2and adjust so that air pressure
indicates 0.5 to 0.55 MPa (Max. 0.55 MPa).
Then lower the knob and x it.
* Close air cock 1to expel air.
[When using area 3020]
The sewing machine of area 3020 cannot be raised unless the throat plate auxiliary cover (asm.) is
removed. Raise the sewing machine after removing the throat plate auxiliary cover (asm.) referring to
“!- 3-3. Installing the throat plate auxiliary cover ” , p.4.
The raising procedure after removing is the same to [When using area 2516].
When using the sewing machine, install the throat plate auxiliary cover (asm.) referring to
“!- 3-3. Installing the throat plate auxiliary cover ” , p.4.
1. To prevent the sewing machine from falling, be sure to raise the machine head after xing
table/stand (casters) at the leveled place so as to prevent it from moving.
2. Be sure to raise the machine after shifting feeding frame 3to the rightmost position
since X-feed cover 4interferes with the machine table causing breakage.
3. When the machine is raised, clean portion Aof the bottom face of the machine to pre-
vent the surface of the machine table from being stained with oil.
6
Machine head in the xed state
To return the sewing machine to its initial position,
follow the steps of procedure described below.
1. Return stopper release lever 6to its initial
position. (Return the lever until it is xed.)
2. Carefully return machine head grip 1to its
initial position with both hands.
• While returning the sewing machine
to its initial position, gas spring 5
works when the sewing machine
is inclined by approximately 70
degrees of an angle to hold the
machine at that position before the
machine reaches its initial position.
Then, further apply force in the re-
turning direction to return the sew-
ing machine to its initial position.
• If you return the sewing machine
to its initial position swiftly, the
sewing machine open/close lock
mechanism will work. In this case,
slightly lift the sewing machine
from the position where it is locked
to reset the lock mechanism. Then,
carefully return the sewing machine
to its initial position again.

– 9 –
3-8. Cautions for the compressed air supply (source of supply air) facility
As large as 90 % of failures in pneumatic equipment (air cylinders, air solenoid valves) are caused by "con-
taminated air."
Compressed air contains lots of impurities such as moisture, dust, deteriorated oil and carbon particles. If
such "contaminated air" is used without taking any measures, it can a cause of troubles, inviting reduction in
productivity due to mechanical failures and reduced availability.
Be sure to install the standard air supply facility shown below whenever the machine provided with pneumat-
ic equipment is used.
Standard air supply facility to be prepared by the user
Standard equipment supplied by JUKI
Air compressor
After cooler
Air tank
Main line lter
Air dryer
Mist separator
Auto-drain
Auto-drain
Quality of the air supply
When the supply air contains a considerable amount of moisture
Ambient environment
When our machine is installed at a place where the temperature greatly
changes in the morning and in the evening from that in the daytime or
freeze is like to occur
In the aforementioned cases, be sure to install an air dryer.
(Most troubles in the air solenoid valves are caused by carbon.)
Be sure to install a mist separator.
When the supply air contains a considerable amount of carbon and dust
Filter regulator
Air solenoid valve
Air cylinder
Cautions for main piping
• Be sure to slope main piping by a falling gradient of 1 cm per 1 m in the direction of air ow.
• If the main piping is branched off, the outlet port of the compressed air should be provided at the
top part of the piping using a tee in order to prevent drain settling inside the piping from owing
out.
• Auto drains should be provided at all lower points or dead ends in order to prevent the drain from
settling in those parts.

– 10 –
B
1
A
4. PREPARATION OF THE SEWING MACHINE
4-1. Lubrication
WARNING :
Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of
the sewing machine.
1) Check that the place between lower line Band
upper line A is lled with oil. Fill there with oil
using the oiler supplied with the machine as
accessories when oil is short.
1. Do not lubricate to the places other than the oil tank and the hook of Caution 2 below.
Trouble of components will be caused.
2. When using the sewing machine for the rst time or after an extended period of disuse,
use the machine after lubricating a small amount of oil to the hook portion. (For remov-
ing the shuttle, see “#-1-2. Adjusting the needle-to-shuttle relation” p.102.)
2) Apply one drop of oil to the hook race 1part to
spread on it.
The oil tank which is lled with oil is only for lubricating to the hook portion. It is possible
to reduce the oil amount when the number of rotation used is low and the oil amount in the
hook portion is excessive. (Refer to “#-1-10. Amount of oil supplied to the hook” p.112 .)
3-9. Installing the eye protection cover
WARNING :
Be sure to attach this cover to protect the eyes from the disperse of needle breakage.
Use eye protection cover 1after securely attach-
ing it on face plate cover 3with screw 2.
1
3
2

– 11 –
4-3. Threading the machine head
WARNING :
Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of
the sewing machine.
4-4. Installing and removing the bobbin case
WARNING :
Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of
the sewing machine.
1) Open hook cover 1.
2) Raise latch 3of bobbin case 2, and remove
the bobbin case.
3) When entering bobbin case, insert it with the
latch tilted until "click" sounds.
If it is not fully inserted, bobbin case
2may slip off during sewing.
1
3
2
4-2. Attaching the needle
1
2
WARNING :
Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of
the sewing machine.
Loosen setscrew 1and hold needle 2with the long
groove facing toward you. Then fully insert it into the
hole in the needle bar, and tighten setscrew 1.
When tightening setscrew 1, be sure
to use the screwdriver (Part No. :
40032763) supplied as accessories.
Do not use L-shaped hexagon wrench
key. There is a danger of breaking set-
screw 1.
1.5mm

– 12 –
4-5. Installing the bobbin
12
5
4
3
2.5 cm
WARNING :
Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of
the sewing machine.
1) Set the bobbin 1into bobbin case 2in the
direction shown in the gure.
2) Pass the thread through thread slit 3of bob-
bin case 2, and pull the thread as it is. By so
doing, the thread will pass under the tension
spring and be pulled out from thread hole 4.
3) Pass the thread through thread hole 5of the
horn section, and pull out the thread by 2.5 cm
from the thread hole.
If the bobbin is installed in the bobbin
case orienting the reverse direction, the
bobbin thread pulling out will result in an
inconsistent state.
2
1
4-6. Adjusting the thread tension
If thread tension controller No. 1 1is turned
clockwise, the length of remaining thread on the
needle after thread trimming will be shorter. If it is
turned counterclockwise, the length will be longer.
Shorten the length to an extent that the thread is
not slipped off.
Adjust needle thread tension from the operation
panel and bobbin thread tension with 2.
Longer
Shorter
Adjusting the needle thread tension
1) Select THREAD TENSION button
Ain the sewing screen.
2) Set a needle thread tension using
PLUS/MINUS (+/–) button B. There is a
setting range of 0 to 200. When the set
value is increased, the tension becomes
higher.
* When the set value is 50 at the time of
standard delivery, the thread tension is
adjusted so that H type is 2.35N and S
type is 1.47N (spun thread #50).
(When thread tension No. 1 is released)
AB
B

– 13 –
4-7. Intermediate presser height
Press INTERMEDIATE PRESSER SETTING button Aand adjust
with TEN keys Bso that the clearance between the bottom end of
intermediate presser and the cloth is 0.5 mm (thickness of thread
used).
1. Setting range of the intermediate presser is up to the standard of 3.5 mm.
However, when using DP X 17 needle for H type or the like, the setting range can be
changed up to max. 7 mm with memory switch U112.
2. When increasing the height of intermediate presser or making the needle size thicker,
conrm the clearance between the wiper and the components. Wiper cannot be used
unless the clearance is secured. Turn OFF the wiper switch. Besides, note that the
wiper is set so as to sweep at the position where the intermediate presser is in the low-
est position in spite of the setting of intermediate presser height at the time of delivery.
(Memory switch U 105)
1. When raising the intermediate presser height, turn the pulley by hand to lower the needle
bar, and conrm that the needle bar does not interfere with the intermediate presser. (When
using DP X 5 needle, use the sewing machine with the height of 3.5 mm or less.)
2. Take care not to get your hands and ngers caught in the feeding frame or intermediate
presser.
0.5 mm
4-8. Adjusting the thread take-up spring
Decrease
Increase
3
2
1
4
1) Adjusting the stroke
Loosen setscrew 2, and turn thread tension asm. 3.
Turning it clockwise will increase the moving
amount and the thread drawing amount will
increase.
2) Adjusting the pressure
To change the pressure of the thread take-
up spring
1
, insert a thin screwdriver into the
slot of thread tension post
4
while screw
2
is
tightened, and turn it. Turning it clockwise will
increase the pressure of the thread take-up
spring. Turning it counterclockwise will de-
crease the pressure.
A
B
[IP-420]

– 14 –
5. OPERATION OF THE SEWING MACHINE
5-1. Sewing
3P pedal [In case of 3P pedal]
* Steps 1), 2) and 3) can be
operated in the reverse order
by setting of memory switch
U81.
1) Place a sewing product under
the feeding frame. Depress
pedal Aof the pedal switch,
and the feeding frame (right)
will come down to clamp the
sewing product.
[In case of 2P pedal]
1) Set a workpiece on the sewing machine.
2) Depress the pedal switch A, and the feeding
frame will come down. Depress it again, and
the feeding frame will go up.
3) Depress the pedal switch Bafter the feeding
frame has come down and the sewing machine
will start sewing.
4) After the sewing machine completes sewing,
the needle point will return to the start point
and the feeding frame will go up.
AB
2P pedal
2) Place a workpiece to be sewn on the sewing product under the feeding frame (left). Lightly depress
pedal B, and the feeding frame (left) will stop in its intermediate stop position. Release the pedal,
and the feeding frame (left) will rise back to the initial position.
3) Position the workpiece. Further depress pedal B, and the feeding frame (left) will come down to the
lowest position to clamp the workpiece. Re-depress pedal Buntil it will go no further, the feeding
frame (left) will return to the intermediate stop position.
4) Depress pedal Cwhen both frames of the feeding frame rest in the lowest position, and the sewing
machine will start sewing.
ABC
B
e e e
1) 2) 3) 4)

– 15 –
5-2. Needle thread clamp device
By actuating the needle thread clamp device, trouble of sewing at the high-speed start (needle thread
slip-off, stitch skipping or needle thread stain) is prevented, and can reduce gathering (bird's nest) of
needle thread on the wrong side of cloth while keeping stable sewing. When mounting the IP-420,
changeover of motion ON/OFF is performed with key.
When the needle thread clamp device is OFF, the machine automatically operates at slow-start.
When memory switch No. 35 is "1" (prohibited), the thread clamp does not work. In addi-
tion, key is ineffective.
* Matters that demand special attention when using the needle thread clamp device
For the thread clamp unit, there are S type and H type in accordance with the sewing types. Refer the
respective types and the contents of the memory switches that can be set to the list below.
[Regarding H type thread clamp unit]
Change the set value of memory switch U69 in accordance with the thickness of needle thread. The set
value has been set to 1 : H type thin thread at the time of delivery. Commendable value is Set value : 1
for thread count #50 to #8, Set value : 2 for thread count #20 to #5, and Set value : 3 for thread count
#5 to #2. (The value will change in accordance with the kind and thickness of the actual thread and the
kinds of materials to be sewn.) Set the value by adjusting to the state of needle thread on the wrong
side of materials.
In addition, it is possible to select the thread clamp position by means of memory switch U70. When
using thick thread of thread count #5 to #2, and rolling-in or tucking at the start of sewing occurs, set the
set value to 1 : Rear and use the machine.
Use the set value of the memory switch which is adjusted to the thread clamp unit type. (For
S type thread clamp unit, the set value of U69 and U70 can use nothing but only "0".) When
the setting is wrong, the thread clamp fails to properly function. So, be careful.
Sewing machine
type
Thread clamp
unit type
Memory switch
U69 U70
AMS-221ENSL S type 0 : S type (standard) 0 : Front
1 : Rear (standard)
AMS-221ENHS
AMS-221ENHL
H type 1 : H type thin thread (standard)(#50 to #8)
2 : H type intermediate (#20 to #5)
3 : H type thick thread (#5 to #2)
0 : Front
1 : Rear (standard)

– 16 –
(1) When with thread clamp (motion), use the sewing machine after adjusting the needle thread length
at the start of sewing to 40 to 50 mm. When the needle thread length is too long, the needle thread
end held with the needle thread clamp may be rolled in the seams.
40 to 50mm
1) In case of with the needle thread clamp, the
standard of the length of needle thread is 40 to
50 mm.
• To prevent the thread from slipping off from the
needle eyelet at the beginning of sewing or to
prevent stitch skipping from the rst stitch
/Adjust the length of needle thread longer
within the range.
• To prevent stitch skipping within the second to
tenth stitches from the beginning of sewing
/Adjust the length of needle thread shorter
within the range
1)
3)
(2) When the thread clamp is used, and bobbin thread at the sewing start appears on the right side of
material, reduce thread tension at the sewing start (2 to 3 stitches) and bobbin thread becomes less
conspicuous.
[Example of setting]
Tension of 1 to 2 stitches at the sewing start is “20” when sewing tension setting is “35”.
* For setting of tension at the start of sewing, see of
"@-2-8.(1) Changing the thread tension value" p.35.
1. Thread at the start of sewing may be rolled in case of some patterns. When thread is
rolled in even after performing adjustment of (1) or (2), use the sewing machine with
thread clamp OFF.
2. Thread clamp failure may occur in the state that thread waste is jammed in the thread
clamp device. Remove the thread waste referring to
"#-1-6. Needle thread clamp device" p.106.
When needle thread is excessively long at the time of using the thick thread, the end of
needle thread held with the needle thread clamp is rolled in the seams, and slip of position
of material may occur or needle breakage may be caused.