UT Device

Models: W(T)200 Series

W(T)600 Series

Thank you for purchasing Pegasus' labor saving device.

Study this manual very carefully before beginning any of

the procedures and then use the device correctly and
safely.

Keep this manual in a convenient place for quick refer-

ence when needed.

Read also the instruction manual supplied with the motor.

Thread trimmer

INSTRUCTIONS
9A2833E
1.Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Installing and adjusting UT device
Threading diagram for W600
2.Indications of dangers, warnings & cautions . 1-2 Taking the thread take-up bracket in and out . . . . . . . . . 12

3.Safety precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3 Threading diagram for W200

Taking the thread take-up bracket in and out . . . . . . . . . 13
4.Notes for each procedure . . . . . . . . . . . . . . . . . . . . . . . . 3-4
Sewing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Applications and functions of the UT device . . . . . . . . 5
Adjusting the driving system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Installation
Installing the electric presser foot lift . . . . . . . . . . . . . . . . . . . . . 6 Lower knife adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16-18

Installing the pneumatic presser foot lift . . . . . . . . . . . . . . . . . 6 Upper knife adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Installing the filter regulator and solenoid valve Lower knife clamp spring adjustment . . . . . . . . . . . . . . . . . . . 19
(Air lines for the pneumatic UT) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Under thread holder adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Connecting air lines for the pneumatic UT
Connecting air lines for the pneumatic UT Upper knife stopper adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Adjusting the speed controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Knife holder guide clamp spring adjustment . . . . . . . . . . 20
Connecting air lines for the pneumatic UT
(Pneumatic needle thread wiper) To position the knives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Adjusting the speed controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Adjusting the electric needle thread wiper . . . . . . . . . . . . . 21
Connecting air lines for the pneumatic UT
(Pneumatic top cover thread wiper) Installing the looper thread clamp
Adjusting the speed controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 (accessory) for W600 Series . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Adjusting the air pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Adjusting the pneumatic needle

thread wiper (air wiper) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Adjusting the pneumatic top cover

thread trimmer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Adjusting the thread releaser . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Adjusting the operation detector . . . . . . . . . . . . . . . . . . . . . . . . . . 24

1.Introduction@@@@@@@@@@@@@@

This manual describes the instructions for using this device safely.

Study this manual very carefully and understand fully how to operate, check, adjust and maintain the labor
saving device before beginning any of the procedures.

You always perform operations close to moving parts such as needles when using industrial sewing machines.
Therefore you have to keep in mind you could easily touch them. To prevent accidents, it is essential that you
use the safe products supplied by Pegasus correctly.
All the people who will use sewing machines must study this manual and the instruction manual for sewing
machines very carefully and then take necessary safety measures before beginning any of the procedures.

2.Indications of dangers, warnings and cautions@

To prevent accidents, indications (symbols and/or signs) which show the degree of danger are used on our
products and in this manual. Study the contents very carefully and follow the instructions.

Indication labels should be found easily.

Attach new labels when they are stained or removed.

Contact our sales office when new labels are needed.

Indicates an immediate hazard to life or limb.

Indicates a potential hazard to life or limb.

Indicates a possible mistake that could result in injury or damage.

 Be sure to follow the instructions when you operate the machine and/or labor saving device.

If you use the machine and/or labor saving device incorrectly, you may get an electrical shock.

If you use the machine and/or labor saving device incorrectly, your hands and/or fingers may
be injured.

If you use the machine and/or labor saving device incorrectly, you may cause fire.

Never do this.

Unplug the machine or shut off the power when checking, adjusting and/or repairing the
machine and/or labor saving device, or when lightning may strike.

Be sure to connect to ground.

If you use the machine and/or labor saving device incorrectly, your fingers and/or hands
may be caught in them or it, causing trouble.

If you use the machine and/or labor saving device incorrectly, you may burn yourself.

3.Safety precautions 3.Do not leave the device outside, in high temperatures or the
direct sun.
Applications, purpose 4.Do not use the device in high humidity or ambient temperatures
which may affect them.
The labor saving device is designed to increase quality and 5.Do not use the device on the condition that the voltage fluctua-
productivity according to you needs. tion range is more than 10% of the rated voltage.
Therefore never use the device for the applications which may 6.Do not use the device at the place where the supply voltage
defeat the above purpose. specified for the control motor cannot be properly obtained.
7.Do not use the device at the place where the air supply specified
Circumstances for the device cannot be properly obtained.
8.Do not expose the device to the water.
Some circumstances when you are using the labor saving device
may affect its life, function, performance, and safety.

For safety, do not use the labor saving device under the
circumstances below.

1.Do not use the device near objects which make noise such as a
high-frequency welder, etc.
2.Do not use or store the device in the air which has vapor from
chemicals, or do not expose the device to chemicals.
Safety measures 4.Notes for each procedure
(1)Safety precautions when you perform maintenance on
the labor saving device. CAUTION
When performing maintenance such as when checking, repairing,
cleaning the labor saving device, turn off the power, disconnect Unpacking
the power plug from the outlet and press the machine treadle in The machine and device are packed in boxes (and plastic bags) in
order to make sure the machine does not run. the factory before shipment. Unpack the boxes and bags properly
If you have to perform maintenance on the machine and/or labor and sequentially by following the instructions shown on them.
saving device with the power on, always be careful because the
machine and/or device could start operating unexpectedly. Installation, preparation
To prevent accidents caused by incorrect operation, you should
establish your own procedures for safe operation and follow
them. CAUTION
Only well-trained people should perform routine daily Connecting the air lines
maintenance and/or repair the machine and/or device.

1.Always turn off the power first and then connect the air lines to
Do not modify the machine and device yourself. the joints. Be sure to connect all the air lines before connecting
them to the air source.
Consult you local Pegasus' sales office or representative for 2.When connecting the air lines to the joints, be sure to insert the
modification. joints to the proper depth of the air lines and fasten securely.
3.Do not allow excessive force to be exerted on the air lines while
using the device.
(2)Before operating the device

4. Do not bend the air lines too much.

Before operating the device, check the machine head, machine
unit and device to make sure they do not have any damage 5.If necessary, protect the air lines by positioning them safely
and/or defects. and/or using the cover.
Repair or replace any defective parts immediately.

6. Do not use staples to secure the air lines. Otherwise it may

To prevent accidents, always make sure the safety covers and cause damage.
safety guards are properly secured.
Never remove the safety covers and safety guards.

WARNING
(3)Training

Connecting the cords

To prevent accidents, operators and service/maintenance
personnel should have proper knowledge and skills for safe 1. When connecting the power cord, be sure to turn off the
operation. power and disconnect the power plug from the outlet.
To ensure so, managers must design and conduct training for
these people. 2. Check the voltage designation to make sure the power
relay cord matches the local supply voltage. The use of wrong
cord may cause damage to parts and/or fire.
3.Do not allow excessive force to be exerted on the cords while
using the device.

4. Do not bend the cords too much.

5.Confirm that the cord is at least 25mm away from moving part of 6.Drain and clean the filter regulator periodically, if the device is
the machine and/or the device when you connect the cord. pneumatic. Otherwise drainage will flow into the solenoid valve
6.If necessary, protect the cords by positioning them safely and/or and/or air cylinder, causing trouble.
using the cover. 7.Always turn off the power before leaving the machine table.
8.If any trouble occurs, stop using the machine and turn off the
7. Do not use staples to secure the cords. Otherwise it may power. Check, repair and/or perform other necessary procedures
cause damage. immediately.

Ground 9. Pay close attention to the knife edges not to injure your
hands and/or fingers.
1.Connect each of the ground wires in the sewing machine system
to the ground terminal. Do not connect one devices' ground wire
to another devices'. CAUTION
2. Connect the ground wires securely to the indicated ground Maintenance, check & repair
points on the machine head.
1.Well-trained people who studied this instructions very carefully
should maintain, check and repair the machine and device.
WARNING 2.Perform routine daily maintenance and periodical maintenance by
following this instructions.
Before operation 3.Use Pegasus' genuine parts when repairing and/or replacing
parts.
1.Check the cords, connector and air lines to make sure they do Pegasus disclaims all responsibility for accidents caused by
not have any damage, disconnections or tangles and then turn on improper repair/adjustment and/or use of parts which are not
the power. genuine.

2. Do not bring your hands and/or any part of your body close 4. Do not modify the device yourself.
to the needle and pulley when turning on the power. Pegasus disclaims all responsibility for accidents caused by
3.Well-trained people who studied this manual and the instruction modification.
manual very carefully should use the machine with the labor 5.After maintaining, checking, and/or repairing the machine and
saving device. device, always make sure that any trouble does not occur when
4.Study the contents on "2. Indications of dangers, warnings and the power is turned on.
cautions" very carefully and then provide users with safety 6.Before and after operation clean lint and any other foreign from
training as required. the device not to cause trouble.
7.Make sure to replace the safety covers when you need to remove
them for checking and/or maintenance.
WARNING
Precautions for work and operation

1. The area near the presser foot is very dangerous during

sewing. Do not bring your hands and/or any part of your body
close to the presser foot.
2.To prevent accidents, be careful that any foreign matter such as
water, other liquids or metals do not get into the device.
3.Wear clothes that cannot be caught in the machine.

4. Do not leave tools or other unnecessary objects near the

device.
5.To prevent accidents, always make sure the safety cover are
properly secured.
Applications and performance

Features:

This device is available for flatbed, interlock stitch machines.

Needle threads, looper threads and top cover threads are easily
trimmed by pressing the treadle with heel. This device eliminates a
tedious thread trimming operation, thus dramatically increasing
efficiency.

Driving method:

To trim the threads and to lift the presser foot, two types of driving
methods, pneumatic and electric are available.
 Installing the electric presser foot lift
1

CAUTION
Always turn off the power, unplug the machine and then well-
qualified technicians should install the electric presser foot lift.

Install solenoid 1 to the table with screws 2, washers 3 and

nuts 4. 2

Adjust nut 8 so that stroke A is 28mm (standard).

3
Hook pitman rod 5 onto the hole at the end of presser foot lift
4
lever 7. Adjust the length of pitman rod 5 by loosening screw
9. Hook pitman rod 5 onto hole B on lever 6.
Give a little play on presser foot lift lever 7.

7
8

A=28mm
6

B
Installing the pneumatic
presser foot lift

CAUTION
10
Always turn off the power, shut down the air compressor and 13
then well-qualified technicians should install the air cylinder.
12
11

Install air cylinder 10 to the machine with screws 11, spring

washers 12 and washers 13.
 Installing the filter regulator and
solenoid valve

CAUTION
Always turn off the power, shut down the air compressor and
then well-qualified technicians should install the filter regulator and
solenoid valve.

Install the filter regulator and solenoid valve on the underside of the
table board with wood screws (see the illustration).

To use the pneumatic top

cover thread trimmer
 4

7
6

2 3
1
1

To air compressor

Connecting air lines for the Adjusting the speed controller

pneumatic UT
To adjust the speed when the upper and lower knives protrude,
adjust speed controller 5. To adjust the speed when the upper and
CAUTION lower knives retract, adjust speed controller 4.

Always turn off the power and air compressor first and then
If the speed is too fast, the operating sound of the air cylinder may
well-qualified technicians should connect the air line.
be increased or some types of threads may be broken before the
After connecting all air lines completely, join them to the air overlap of upper and lower knives occur.
compressor (air source).
To adjust the speed, loosen nut 6, turn knob 7 fully counterclock-
The wrong connection of air line may cause machine wise (to increase the speed) and then turn knob 7 slowly clockwise
malfunction and accidents. Be sure to make proper connections in
(to decrease the speed). After this adjustment, tighten nut 6.
order to prevent any damage to the machine.

Connect air lines by referring to the illustration. When wiring, grounding and installing the position detector,
refer to the attached instruction manual for the UT motor.
Insert the air tube 1 completely to the depth of the joint 2 and
check if the air tube can not be removed by pulling it by hand.
To remove the air tube 1 from the joint 2, push the release ring
3 toward the joint 2 and pull out the air tube 1.
 4

5
7
6

2 3
1
1

To air compressor

Connecting air lines for the Adjusting the speed controller

pneumatic UT (Pneumatic needle thread wiper)
To adjust the speed when the upper and lower knives protrude,
adjust speed controller 5. To adjust the speed when the upper and
CAUTION lower knives retract, adjust speed controller 4.

Always turn off the power and air compressor first and then
If the speed is too fast, the operating sound of the air cylinder may
well-qualified technicians should connect the air line.
be increased or some types of threads may be broken before the
After connecting all air lines completely, join them to the air overlap of upper and lower knives occur.
compressor (air source).
To adjust the speed, loosen nut 6, turn knob 7 fully counterclock-
The wrong connection of air line may cause machine wise (to increase the speed) and then turn knob 7 slowly clockwise
malfunction and accidents. Be sure to make proper connections in
(to decrease the speed). After this adjustment, tighten nut 6.
order to prevent any damage to the machine.

Connect air lines by referring to the illustration. When wiring, grounding and installing the position detector,
refer to the attached instruction manual for the UT motor.
Insert the air tube 1 completely to the depth of the joint 2 and
check if the air tube can not be removed by pulling it by hand.
To remove the air tube 1 from the joint 2, push the release ring
3 toward the joint 2 and pull out the air tube 1.
 2 3
1
1

7 6
4

To air compressor

Connecting air lines for the pneumatic UT Adjusting the speed controller
(Pneumatic top cover thread wiper)

To adjust the speed when the upper and lower knives protrude,
adjust speed controller 5. To adjust the speed when the upper and
CAUTION lower knives retract, adjust speed controller 4.

Always turn off the power and air compressor first and then
well-qualified technicians should connect the air line. If the speed is too fast, the operating sound of the air cylinder may
be increased or some types of threads may be broken before the
After connecting all air lines completely, join them to the air overlap of upper and lower knives occur.
compressor (air source).

The wrong connection of air line may cause machine To adjust the speed, loosen nut 6, turn knob 7 fully counterclock-
malfunction and accidents. Be sure to make proper connections in wise (to increase the speed) and then turn knob 7 slowly clockwise
order to prevent any damage to the machine. (to decrease the speed). After this adjustment, tighten nut 6.

Connect air lines by referring to the illustration.

When wiring, grounding and installing the position detector,
Insert the air tube 1 completely to the depth of the joint 2 and refer to the attached instruction manual for the UT motor.
check if the air tube can not be removed by pulling it by hand.
To remove the air tube 1 from the joint 2, push the release ring
3 toward the joint 2 and pull out the air tube 1.
 Adjusting the air pressure

CAUTION
To adjust the filter regulator, turn off the power and finish air A
piping completely and then turn on the air compressor.

Pull knob A of filter regulator 1 until it clicks.

Then set the filter regulator at 0.5Mpa (5kgf/cm2). 1

To increase the air pressure, turn knob A clockwise. 2

To decrease the air pressure, turn knob A counterclockwise.

Draining the filter regulator

3
Be sure to drain the filter regulator and clean the air filter
periodically. Otherwise it may cause trouble on the solenoid valve
or air cylinder.

Note that drainage spouts downward with air.

Before drainage level reaches baffle 2, drain the filter regulator by

pressing draining valve 3.
 Threading diagram for W600

To use cotton threads

or spun threads

To use woolly
threads

Taking the thread take-up

bracket in and out

Press push button 1 and lift looper thread take-up 2 to thread the
machine easily.
Press the looper thread take-up down and replace it after threading
the machine.

2 2

1
 Threading diagram for W200

To use cotton threads

or spun threads
To use woolly
threads

To use woolly
threads

Taking the thread take-up

bracket in and out

Lift looper thread take-up to thread the machine easily.

Press the looper thread take-up down and replace it after threading
the machine.
 Sewing

Raise the presser foot by pressing the treadle with heel.

Position the fabric under the presser foot. With toe

The UT does not work at this time.

Start the machine by pressing the treadle with toe.

Neutral
Machine speed can be adjusted freely by the amount of With heel
pressing when you press the treadle with toe.
The machine pulley can be turned easily with hand while the
machine is not running.

Press the machine treadle with heel again.

The UT gets actuated. Then the presser foot is lifted.
Remove the fabric from under the presser foot.

After the threads have been trimmed, the presser foot can be
easily lifted or lowered by pressing the treadle with heel.

Presser foot lift knee switch

If you want to lift the presser foot without trimming the threads
during a sewing operation, press the presser foot lift knee switch.

This switch is optional.

 Adjusting the driving system
Electric UT device
To adjust the solenoid assembly for the electric UT

CAUTION
11 36mm
Always turn off the power, unplug the machine and then well-
10
qualified technicians should adjust the solenoid assembly.

To adjust the movement amount of solenoid 7 8 9

Remove cover 1 and loosen nut 2.
Set the amount at 17.9mm with stopper 3. 6
1 2 3 4
When loosening nut 2, fit the round bar (diameter: 5
approximately 3mm) onto stopper 3 to prevent it from moving. 19.6mm 66.5mm

To install crank 4. There should be a distance of 66.5mm

from the left end of bracket 5 to the right end of crank 4 with
the solenoid not in operation (see the illustration). Pneumatic UT device
Adjustment is made by loosening nut 6 and screw 11.

There must be a 36mm distance between the center of screw

19
8 and that of screw 9 in order to mount connecting rod 7. 36mm
Since fine adjustment is made when adjusting the lower knife, 18
fix the connecting rod temporarily with nut 10.

To adjust the air cylinder for pneumatic UT device

16 15 17

CAUTION
14
Always turn off the power, shut down the air compressor and 12
13
then well-qualified technicians should adjust the air cylinder 100mm
assembly.

To install crank 12. There should be a distance of 100mm To make a fine adjustment on the knife, loosen screw 11 (on
from the right end of bracket 13 to that of crank 12 with the air electric UT device) or screw 19 (on pneumatic UT device) so
cylinder not in operation (see the illustration). Adjustment is that driving lever 20 can be moved easily by hand.
made by loosening nut 14 and screw 19. When moving driving lever 20, be sure to bring the needle to
the top of its stroke.
Position connecting rod 15 so that there is a distance of
36mm from the center of screw 16 to that of screw 17.
To make a fine adjustment on the lower knife, tighten nuts 18
temporarily.

W600 Series W200 Series

20 20
 Lower knife adjustment W600 Series

CAUTION
3
Always turn off the power and shut down the air compressor Do not touch
first and then well-qualified technicians should adjust the lower with each other.
knife.

A 5
To prevent to injury to your hands and/or fingers by the 4
cutting edge of the lower knife, great care should be taken when
you perform these procedures.

1 2
The lower knife and the needle may touch with each other.
Be sure to bring the needle to its highest position when adjusting 6
66.5mm
the lower knife.

1. To position the lower knife left to right

W200 Series

W600 Series
Position lower knife 1 so that there is a distance of 65.5mm from 7 8
A
the center of screws 2 to point A of the lower knife. Adjustment is
made by loosening screws 2.

Loosen screws 6 and install thread guide 5. Check to make

sure bracket 4 does not contact thread guide 5 when the looper
thread take-up is raised by pressing push button 3.
66.5mm
W200 Series
Horizontal positioning adjustment of the lower knife.
The distance between the center of lower knife set screw 8 and tip
A of the lower knife should be 65.5mm.
To make this adjustment, loosen lower knife set screw 8.
A 9mm
9
2. To position the lower knife front to back Center tip A
Position lower knife 1 or 7 so that point A of the lower knife is 9mm over the looper.

past the right end of looper 9 and centered front to back over looper
9. Adjustment is made by loosening screw 10 and moving lower
knife holder 11 front or back as required.

W600 Series W200 Series

10 11 10 11
3. Positioning the knife holder W600 Series

W600 Series
With the point of the lower knife 9mm past the right end of the
looper, knife holder guide 2 should slightly contact the end of lower
1
knife holder 1. Adjustment is made by loosening screw 3. Center tip A
9mm over the
looper. 2
A
W200 Series 3
With the point of the lower knife at the extreme left end of its travel,
knife holder guide 5 should slightly contact the end of lower knife
holder 4. Adjustment is made by loosening screw 6.

W200 Series

4
5 6

4. Positioning the lower knife up and down

W600 Series
With the point of the lower knife 9mm past the right end of the
looper, the bottom surface of lower knife 7 should slightly contact
the top surface of looper 8. Adjustment is made by loosening
9mm
screws 10 on bracket 9 and moving bracket 9 up or down as
required.
Light contact 7
W200 Series
With the point of the lower knife 9mm past the right end of the
looper, the bottom surface of lower knife 7 should slightly contact
8
the top surface of looper 8. Adjustment is made by loosening
screws 12 on bracket 11 and moving bracket 11 up or down as
required.

W600 Series W200 Series

9 12 11
10
5. Positioning the lower knife at the extreme left
end of its travel A 1

With lower knife 1 at the extreme left end of its travel, point A of the
lower knife is positioned 22mm from the center of the needle bar. Center of the
Adjustment is made by loosening screws 3. needle bar
Left edge of the
looper's eye
To check the above easily, make sure the left end of the A 1
22mm
looper's eye is aligned with point A of lower knife 1.

6. Checking 4
1mm (Pneumatic UT
device)
After the above adjustment has been made, check the following.
3mm (Electric UT device)
5
Distance B is approximately 2mm with lower knife 1 at the
extreme left end of its travel.
Clearance between the right end of the lower knife holder and 6
3
the arm bed is approximately 1mm with lower knife 1 at the
extreme right end of its travel.

7. Positioning the collar

When the solenoid (air cylinder) is not in operation, there should be

a distance of 3mm (on electric UT device) or 1mm (on pneumatic
UT device) from the left end of bracket 5 to the right end of collar 4.
B 2mm
Adjustment is made by loosening screw 6.

C 1mm
 Upper knife adjustment 3
0.5mm

CAUTION
Always turn off the power first and well-qualified technicians
2 A 1
should adjust the upper knife.

2 1
Pay close attention to the knife edges not to injure your
hands and/or finger.

Overlap and front-to-back positioning adjustments of the upper and

lower knives
This adjustment achieves the correct overlap of upper knife 1 and
lower knife 2. There should be 0.5mm when the lower knife is at
the farthest position to the right. To adjust the upper knife front to
back, align tip A of the upper knife with the front edge of the lower
knife by loosening set screw 3. When making the above
adjustment, the lower knife clamp spring can be loosened, adjust
the lower knife clamp spring simulataneously. (See the following .)

3
Lower knife clamp spring adjustment 4

CAUTION Parallel with

the lower
knife
Always turn off the power first and well-qualified technicians
should adjust the lower knife clamp spring. 2mm

Pay close attention to the knife edges not to injure your

hands and/or finger.

4
Position lower knife clamp spring 4 2mm to the right from the tip of
the upper knife as shown in the right illustration. Adjust the lower
knife clamp spring front to back by loosening set screws 3. Be sure
that the lower knife clamp spring is parallel with the lower knife.

Under thread holder adjustment B 6

5

CAUTION Parallel with

the lower
Always turn off the power first and well-qualified technicians knife
should adjust the under thread holder.
2mm
Pay close attention to the knife edges not to injure your
hands and/or finger.

1. Position under thread holder 5 2mm to the left from the tip of the
5
upper knife as shown in the right illustration. Adjust the under
thread holder front to back by loosening set screws 6.
Be sure that the looper thread holder is parallel with the lower
knife.
2. Under thread holder 5 holds the under threads at the knife
portion after the under threads have been cut. Adjust the looper
thread holder with screw B.

To increase the under thread holder spring pressure, turn screw

B counterclockwise.
 Upper knife stopper adjustment

CAUTION 2

Always turn off the power first and well-qualified technicians

should adjust the upper knife.

Pay close attention to the knife edges not to injure your 1

hands and/or finger. 3 7 7.5mm
Position upper knife stopper 1 to provide a 7-7.5mm clearance
between knife holder guide 2 and upper knife stopper 1 when knife
holder guide is all the way to the right. Loosen set screw 3 to make
this adjustment.

Increasing the clearance reduces the needle thread length.

Decreasing the clearance increases the needle thread length.

Knife holder guide clamp spring adjustment

CAUTION
Always turn off the power first and well-qualified technicians
should adjust the upper knife.

Knife holder guide clamp spring 4 presses knife holder guide 5 to

keep the upper knife in the position when the upper and lower
knives overlap. In the standard setting, screw 6 should be centered
6
in the set slot for spring 4. 5
4
If the upper knife and lower knives are not activated properly in the
standard setting, adjust the spring pressure by loosening screw 6.

If the spring pressure is too heavy, the upper and lower knives will
not return home correctly.

To position the knives

Check for proper cutting action using woolly threads.
Check to see if looper thread 7 and needle threads 8 are
smoothly cut, and looper thread 7 is clamped by looper thread
clamp spring 9. If the threads are not smoothly cut, adjust flat
spring 10 again by referring to page 19.
If the looper thread is not clamped, adjust looper thread clamp
spring 9 again by referring to page 19.

8 7 The looper thread is being

8 7 clamped.
7

8 9 10
 Adjusting the electric needle thread wiper
0~0.3mm

CAUTION
Always turn off the power, unplug the machine and then well-
C 3 4
qualified technicians should adjust the pneumatic needle thread
wiper. 2 1

Adjust the thread wiper with the needles at the top of their 6
stroke.
Otherwise the needles may contact the thread wiper. A=
5 10m
m
Place bracket 1 horizontally so that screws 2 are centered
in the slots. Tighten screws 2 temporarily.

Place lever 3 horizontally with 0~0.3mm clearance between 10

bracket 1 and ring 4. Under this condition distance A should
9
be 10mm. After this adjustment, tighten screw 5.
Approx
D B=
0.7mm
2mm
Place shaft 6 so that distance B is 2mm. Tighten screw 7. 8 7

Bring thread wiper 8 to the extreme left end of its travel.

To do so, turn lever 3 in the direction of arrow D while pulling
Approx
lever 3 in the direction of arrow C.
19mm

With thread wiper 8 at the extreme left end of its travel, the
distance from the end of thread wiper 8 to the center line of Flat spring
the needle bar (at the top of its stroke) should be parallel with the 10
thread wiper
approximately 19mm. Under this condition, the clearance
between thread wiper 8 and the left needle should be
approximately 0.7mm.
Flat spring 10 should
After this adjustment, tighten screws 9 and 2. not protrude from
thread wiper 8.

Place flat spring 10 so that flat spring 10 is parallel with 8 11

thread wiper 8. Tighten screw 11.

Installing the looper thread clamp

(accessory) for W600 Series
12
13 14
CAUTION 15

Always turn off the power and shut down the air compressor
first and then well-qualified technicians should install the looper
thread clamp.

Looper thread clamp 13 is an accessory that prevents stretchable

threads, such as woolly thread from coming off from the looper.
Install looper thread clamp 13 by referring to the illustration.
Replace the screws being used with screws 12 and 14.
 Adjusting the pneumatic needle 3
thread wiper (air wiper)

CAUTION
Be careful when you perform the procedures with the power 1
on. To prevent accidents due to the unexpected start of the
machine and users' misoperation, consider the procedures for
safety and follow them.
2
When the needle is at the highest position, set opening a of the air
wiper 1 ~ 2mm below the eye of the left needle. Distance A from
the center of the left needle to the air wiper on the backside of the
a
needle should be 0.5 ~ 1.5mm. Blowing angle B should be 0 ~ 5 .

Adjustment is made by loosening screw 1 and moving air wiper 2.

To adjust the amount of air from the air wiper

The air should be the extent to which the trailing end of trimmed 1~2mm
needle threads can be removed from the next fabric. Loosen nut 3.
Adjustment is made by turning adjusting screw 4 as required.
After this adjustment, tighten nut 3.

To decrease the amount of air, turn screw 4 clockwise.

B = 0~5
To increase the amount of air, turn screw 4 counterclockwise.
(Rear)

(Front)

A = 0.5~1.5mm
 Adjusting the pneumatic top cover
thread trimmer

CAUTION
Always turn off the power, shut down the air compressor and
then well-qualified technicians should adjust the pneumatic top
cover thread trimmer.
3 2
Great care should be taken not to injure your fingers and/or
hands by the knives.

When hook 1 protrudes, point A should be positioned above 1

top cover thread 2 (see the illustration). Adjustment is made A
by front-to-back positioning screws 3.

Adjust hook 1, spreader 4 and left needle 5 by referring to the

illustration below. Adjustment is made by turning front-to-back
positioning screws 3, left-to-right positioning screws 6 and up-
and-down positioning screws 7.

7
6

1
1

0~0.5mm

0~0.5mm 4

0~0.5mm
 1
Adjusting the thread releaser

CAUTION
Always turn off the power, shut down the air compressor and
then well-qualified technicians should adjust the thread releaser.

Loosen screw 1. Adjust bar shaft 3 to set a clearance of 0.2

~ 0.5mm between the thread tension disks and fingers on
thread releaser 2. Then tighten screw 1.

Adjust shaft 4 to obtain distance A (=30mm). Then tighten

screw 5.

The releasing amount of each thread is made by the

relationship between thread guides 6 and thread releasers 7.
7 0.2~0.5mm
Cotton threads: B=6mm, C=7mm, D=8.5mm, E=6.5mm,
F=9mm
0mm
For stretchable threads, such as woolly threads, all the A=3
distances above from B to F should be slightly shortened.

Without top cover thread trimmer mm

B=6
Position thread releaser 8 (for top cover thread) so that the top
cover thread will not be affected if needle and looper threads 2
are loosened. m
C=7m
3
With top cover thread trimmer 6
Set G at 15mm. m
.5m
D=8
5
4
m) mm
8 15m F=9
(G=

m
.5m
Adjusting the operation detector E=6

CAUTION Loosen screws 9. Set a clearance of 0.5mm between operation

detector 10 and magnet 11. (For left-to-right adjustment, refer to
Always turn off the power, shut down the air compressor and “Positioning the operation detector” in the instruction manual for UT
then well-qualified technicians should adjust the operation detector. motor.)

11
10 11 10
0.5mm
 PEGASUS SEWING MACHINE MFG. CO., LTD.
5-7-2, Sagisu, Fukushima-ku, Osaka 553-0002, Japan. Phone :(06)6458-4739
Telefax:(06)6454-8785

May 2001
Printed in Japan
The description in this INSTRUCTIONS is subject to change without prior
notice for improvement.