Yamato VT2500 User manual

Thank you for purchasing this product. This instruction manual contains infor-
mation on how to handle this product and precautions in usage. Before using
the product, read this instruction manual carefully and familiarize yourself with
its content. Also, keep this manual in safe handy place so that others may use
it as future reference.
Instruction Manual
3-Needle Cylinder Bed
Interlock Stitch Machine
VT2500 Class
VT1500.2500_01

Safety Instructions i～iv
1. Name of each part 1
2. Installation 2
2.1 Tabletoptype..................................................................................................................................................... 2
2.1.1 Tablecuttingdiagram.................................................................................................................................................2
2.1.2 Installationontotable..................................................................................................................................................3
2.2 Semi-submergedtype.................................................................................................................................. 4
2.2.1Tablecuttingdiagram.................................................................................................................................................4
2.2.2Installationontotable..................................................................................................................................................5
2.3 Motor,pulleyandbelt................................................................................................................................... 6
2.4 Hangingbelt......................................................................................................................................................... 7
2.5 Beltcoverinstallation.................................................................................................................................... 8
2.6 Threadtensionunitinstallation............................................................................................................ 9
2.7 Eyeguardandfingerguardinstallation........................................................................................ 9
2.8 Presserlifterpedalinstallation.......................................................................................................... 10
2.9 Supplementarycoverinstallation.....................................................................................................11
3. Sewing speed and pulley rotating direction 12
4. Lubrication 13
4.1 Lubricatingoil................................................................................................................................................... 13
4.2 Lubricating.......................................................................................................................................................... 13
4.3 Changingoil....................................................................................................................................................... 14
4.4 Oilfiltercheckandreplacement....................................................................................................... 15
5. Proper operation 16
5.1 Detaching/reattachingcylinderfrontcover............................................................................ 16
5.2 Needlesystem................................................................................................................................................. 16
5.3 Needleinstallation........................................................................................................................................ 16
5.4 Threading..............................................................................................................................................................17
5.5 Threadtensionunitadjustment........................................................................................................ 18
5.6 Presserfootpressureadjustment................................................................................................. 18
5.7 Differentialfeedadjustment............................................................................................................... 18
5.8 Stitchlengthadjustment........................................................................................................................ 19
5.9 SPdevice..............................................................................................................................................................20
Contents

Note
This product is subject to change without notice. Due to such event, the contents of this manual may not match the
product in some regards. Every effort has gone into making this manual, nevertheless should you discover any mistakes
or missing information, please note that it may not always be possible for Yamato to correct those errors immediately.
Remarks
◇Thismanualhasbeenpreparedprimarily
forengineers,butinformationmarked
with shouldbereadbyoperatorsas
well to ensure the machine is properly
used.
◇Illustrationsinthismanualbearanumber
underthelowerleft-handcorner.These
numbersalsoappearinthebodyofthis
manual,therefore,asnecessary,referto
theindicatedillustration.
5.10 UsingPresserFootReleaseLever...................................................................................................20
5.11 Fabricedgeguidesadjustment......................................................................................................... 21
5.12 Cleaning.................................................................................................................................................................22
6. Machine adjustment 23
6.1 Needlethreadtensionadjustment.................................................................................................23
6.2 Topcoverthreadtensionadjustment..........................................................................................24
6.3 Looperthreadtensionadjustment.................................................................................................24
6.4 Needleandspreaderadjustment....................................................................................................25
6.4.1Spreaderadjustment................................................................................................................................................25
6.4.2Topcoverthreadguideadjustment........................................................................................................26
6.4.3Topcoverthreadeyeletadjustment.......................................................................................................26
6.5 Needleandlooperadjustment...........................................................................................................27
6.5.1Looperandneedledistance.............................................................................................................................27
6.5.2Looperangleandheight.......................................................................................................................................27
6.5.3Looperfront-rearposition..................................................................................................................................27
6.6 Needleheight....................................................................................................................................................28
6.7 Needleguard(rear)adjustment.......................................................................................................29
6.8 Needleguard(front)adjustment.....................................................................................................29
6.9 Feeddogheightadjustment................................................................................................................30
6.10 Presserfootpositionadjustment....................................................................................................30
6.11 Presserfootstoppercollaradjustment..................................................................................... 31
6.12 Detaching/reattachingpresserfoot.............................................................................................. 31
7. Toubleshooting 32
8. Specifications 33
Contents

i
1. To ensure safe use
Always observe the following instructions to
ensure the safe use of the industrial sewing
machines and devices.
1.1 Application and purpose
The sewing machine is designed to improve
productivity in the sewing industry and
must not be used for other applications and
purposes. Do not use this sewing machine until
it can be con󲥬rmed that safety measures for
the drive units have been taken.
1.2 Before use
Read all instruction manuals thoroughly before
starting the use of this machine and follow
them.
Also, read the instruction manual for the
installed drive unit.
1.3 Working environment
DO NOT WORK IN THE FOLLOWING ENVIRONMENTS:
◇ Place where atmosphere temperature
and humidity give a bad influence the
performance of sewing machines.
◇ Outdoors and place where the sewing
machines are exposed to sunlight directly.
◇ Atmosphere containing dust, corrosive gases
or 󲥭ammable gases.
◇ Place where voltage 󲥭uctuation exceeds ｱ10%
of the rated voltage.
◇ Place where power capacity necessary for
the used motor specifications cannot be
secured.
◇ Place where strong electric or magnetic
fields are generated such as near large-
output high frequency transmitters or high
frequency welding machines.
1.4 Unpacking and transportation
（1） Unpack from the top.
（2） Never hold the parts near the needle or
threading parts when removing the sewing
machine head from the buffer of box.
（3） When carrying the sewing machine head,
have an assistant.
（4） Pay attention not to get excessive impact
or shock when moving the sewing machine
head with a pushcart.
2. Installation and preparation
Always observe the following instructions to
ensure the safe use of the industrial sewing
machines and devices.
2.1 Instruction and training
Operators and workers, who supervise, repair
or maintain the machine head and machine unit,
are required to have the adequate knowledge
and operation skills to do the job safely. In
order to establish such necessary conditions,
it needs for the employer to plan and enforce
the safety education and training to those
workers.
2.2 Sewing table and motor
（1） Prepare a machine table that has enough
strength to withstand the weight of
the sewing head and any reaction while
operating.
（2） Maintain a comfortable working environment
with considering the lighting and the
arrangement of sewing machine so that the
operators can work smoothly.
（3） When installing the control box and the
related parts on the sewing machine, take
care about the posture of the worker.
（4） Install the drive unit correctly according
to the instruction manual.
Safety Instructions

ii
2.3 Wiring
（1）Never connect the plug for power supply
until assembly is 󲥬nished.
（2）Fix the connectors securely to the
sewing machine head, motor, and electric
apparatus.
（3）Do not apply excessive force to the
connection cords.
（4）Connect the cords away from the driving
parts.
（5）Place the ground wire securely to the
designated position on the machine head.
2.4 Before operation
（1） Take care not to attach lubricant,
silicone oil, and grease on the eyes or
skin. Keep them away from children.
（2） Be sure to fill or drop lubrication oil
before operating the sewing machine.
Use the Yamato SF oil as speci󲥬ed.
（3） Never put your hand under the needle or
near the moving parts of the machine when
turning on power supply switch.
（4） When operating a new sewing machine, make
sure the rotating direction of pulley
agrees with the rotating-direction mark.
2.5 During operation
（1） Be sure to operate the sewing machine with
the safeguards such as belt cover, 󲥬nger
guard, and eye guard.
（2） Never place the finger, hair or objects
under the needle or close to the moving
parts while operating the sewing machine.
（3） Be sure to turn off the power supply
switch when threading or replacing the
needles.
（4） Never place your hands close to the knives
when operating the sewing machine with the
trimming devices.
（5） Be sure to turn off the power supply
switch when terminating the sewing work or
leaving the sewing machine.
（6） If the sewing machine malfunctions,
abnormal sound or smell something unusual
while operating, be sure to turn off the
power supply switch.
2.6 Removal
（1） Turn off the power supply switch if
removed or replaced any parts or during
adjustment of sewing machine.
（2） Do not pull the cord when removing the
plug. Be sure to hold the plug itself.
（3） A high voltage is applied inside the
control box. Turn off the power supply
switch and wait more than 5 minutes before
opening the cover.
3. Maintenance, inspection, and repair
（1） Follow the instruction manuals for
maintenance, inspection, and repair.
（2） Entrust the maintenance, inspection, and
repair to specially trained personnel.
（3） Be sure to turn off the power supply
switch and make sure that the sewing
machine and motor completely stop before
the maintenance, inspection, and repair.
(If using a clutch motor, take care
that the motor keeps turning for a while
even after turning off the power supply
switch.)
（4） Do not modify the sewing machine by the
customer’s judgment.
（5） Be sure to use original replacement parts
for repairs or maintenance.
Safety Instructions

iii
4. Caution signs and alert pictorial markings
This instruction manual contains the following
caution signs and alert pictorial markings
to prevent you from injuring yourself or the
sewing machine from being damaged.
Please follow the instructions.
4.1 Meanings of caution signs
WARNING
indicates potentially hazardous
situations which, if not heeded, could
result in death or serious injury to you
and others.
CAUTION
indicates hazardous situations which,
if not heeded, may result in minor or
moderate injury to you and others, or
may result in machine damage.
4.2 Alert pictorial markings
This mark indicates the warning which,
if not heeded, could result in death
or serious injury.
This mark indicates the caution for
high temperature.
This mark indicates the warning which,
if not heeded, could result in death
or Serious injury. And also this mark
is used to emphasize the important
information.
High-voltage applies in the control
box. This label indicates that
electric shock may be caused.
This mark indicates the caution
which, if not grounded, the machine
or device could malfunction and could
result in personal injury.
5. Warning labels on sewing machines
1
2
This label indicates that
removal of the safeguards
and works except for
sewing performance while
the power supply switch
is on are prohibited.
(For details, see the
next page.)
High-voltage applies in
the control box. This
label indicates that
electric shock may be
caused.
This label is affixed
on the safeguards.
Considering the
operation, it is not
af󲥬xed on the 󲥬nger guard
and eye guard. Be sure
to operate with the 󲥬nger
guard and eye guard in
position.
Stepping motor and
solenoid may overheat if
used continuously. To
prevent a burn, take care
not to touch.
If not connected earth
line, static electricity
may be generated and
in󲥭ict injury on person.
In addition, the
malfunction of electric
system may cause injury
to person.
Check the rotating
direction of machine
pulley agrees with
‘ROTATING-DIRECTION
SYMBOL’.
Safety Instructions

iv
VT1500.2500_01
6. Location of Safety Labels
Safety labels are placed adjacent to potential hazards.
Keep these labels clean and easily readable at all times; should a label become damaged or lost,
a replacement should be ordered.
1
2
Safety Instructions

1
VT2500
VT1500.2500_01
1.Name of each part
●Presser spring regulator●Lifter lever
●Differential lever
● Thread
tension
unit
●Oil sight window
●Presser foot
●Pushbutton
●Chain cutter
●Eye guard
●Oil gauge
●Oil reservoir
●Pulley
●Cylinder front cover
001
002
●Finger guard
003
●Presser foot release lever

2VT2500
2.Installation
004
2.1 Table top type
2.1.1 Table cutting diagram
4‑R20
Y Y
XX
4‑φ6.5
185
30
140 160
φ16
33
Machine pulley center
R10
160 75.5
110
750（Internal dimension between table legs）
343.5
359
Operator
25 80
R25
R25
R10
154230
C
D
41
222
(257)
Belt center
Presser lifter
shaft support
Table external dimensions: 1200×595×40(mm)
60゜
10
Section Y‑Y
Section X‑X
3‑φ9.5 (Motor installation hole)
3‑φ26
7
50
B A
E F
15
224.5
Pedal position
Right 260 270
200 410
Left
E F
* For dimensions A, B, C and D, see the Instruction Manual of the motor.
Presser lifter shaft support installation location

3
VT2500
2. Installation
The sewing machine weighs 42 kg or more. Work in
twos or more when unpacking, carrying and installing
the machine.
CAUTION
2.1.2 Installation onto table
Install the sewing machine correctly as shown in
Fig. 004, 005 and 006.
（1） Attach the bolts and nuts to the machine
table.
（2） Cover the bolts with the rubber cushions.
（3） S et the sewing machine over the rubber
cushions.
Rubber cushion
Nut
Bolt
Machine table
Machine table
Sewing
machine
Rubber
cushion
005
006

4VT2500
2. Installation
Pedal position
Presser lifter shaft support installation location
Right
Left
Section X‑X (4 places)
Section Y‑Y
Table external dimensions: 1200×595×40(mm)
(Internal dimension between table legs)
Operator
(Machine pulley
center)
EF
EF
270260 410200
Presser lifter
shaft support
007
2.2 Semi-submerged type
2.2.1 Table cutting diagram

5
VT2500
2. Installation
● If the thickness of the table exceeds the standard (40
mm), use the rubber cushion spacer ④ or adjust the
number of the supporting board spacers ⑤.
● The top surface of the stitch plate is typically
approx. 100 mm high from the table.
Notes
010
009
③
Machine table
②
④
③
⑤
①
5GEVKQP;;
5GEVKQP::
RNCEGU
Supporting board
008
The sewing machine weighs 42 kg or more. Work in
twos or more when unpacking, carrying and installing
the machine.
CAUTION
Machine table
Supporting
board
Machine
④
⑤
* For dimensions A, B, C and D, see the Instruction Manual of the motor.
2.2.2 Installation onto table
Properly install the sewing machine referring to the 󲥬gures
007, 008, 009 and 010.
（1） Attach the bolt ② (4 in total) to the
supporting board ①.
（2） Cover the bolt ② with the rubber cushion ③.
（3） Fix the supporting board ① to the machine table ②
while inserting the two supporting board spacers ⑤
between the board and the table.

6VT2500
2. Installation
2.3 Motor, pulley and belt
Clutch motor
◇ See the instruction manual of the motor you are
using.
◇ The clutch motor should be installed in a
position where the center of the motor pulley
② and the center of the machine pulley ①
align with one another when the pedal is
depressed and the motor pulley ② moves to the
left.
◇ Commercially available pulleys have outer
diameters incremented every 5 mm, therefore
pulleys are speci󲥬ed by commercial sizes.
Use of an inappropriate motor pulley may cause the
sewing machine to exceed the maximum speed whereby
resulting in breakdown.
CAUTION
40゜
5.5mm
10mm
66.5mm
V-belt of M-type
011
①
②
Servomotor
See the instruction manual of the motor you are
using.
Calculate motor pulley outer diameter from the
below formula. Or select the best size of motor
pulley from Table 2.
Sewing speed
Motor pulley O.D.＝ ――――――――― × 66.5 + 5mm
Servomotor speed
◇ Commercially available pulleys have outer
diameters with every 5 mm increment, therefore
select a pulley of an outer diameter that is
near to the calculated outer diameter.
Belt
Use an M-type V-belt.
For sizes, see Table 1.
Table 1
Motor pulley
O.D. (mm)
Sewing speed (rpm) Belt size
50Hz 60Hz
75 3600 M36
80 3850 M36
85 3400 4100 M36
90 3600 4350 M37
95 3800 M37
100 4000 M37
105 4200 M38
110 4400 M38
◇ Numerical figures are given for a 3-phase,
2-pole, 550 W (3/4 HP) clutch motor.
Table 2
Sewing speed
（rpm）
Motor pulley O.D.
Servomotor speed （rpm）
3000 3600
3500 83 70
3800 89 75
4000 94 79
4300 100 84
4500 105 88
◇ Numerical figures are examples for servomotors
of 3000 and 3600 rpm.

7
VT2500
2. Installation
Turn off the power switch of the motor and check the
motor has stopped before hanging or replacing the
belt. If not, hands or clothing may become entangled
whereby resulting in injury.
CAUTION
2.4 Hanging belt
10 - 20 mm slack
012
013
②
①
③
（1） Hang the belt ① around the machine pulley ②.
（2） While turning the machine pulley ②, hang the
other end of belt ① around the motor pulley
③.
（3） Stretch the belt so that the belt has a 10 to
20 mm slack when a force of about 10 N (1.02
kgf) is applied to the center of the belt.
（4） Once the belt is suf󲥬ciently taut, securely lock the
motor pulley.
* How the motor is locked down differs
depending on motor, therefore see the
instruction manual of the motor.
SUPPLEMENT
Semi-submerged installation of the machine requires
the supplementary belt cover to be installed before the
machine is mounted on the table and the belt is hanged
in place. See page 8.
②
①

8VT2500
2. Installation
2.5 Belt cover installation
● Turn off the power switch of the motor and check
the motor has stopped before installing the belt
cover. Working with the power on can result in
injury.
● Install the belt cover without fail.
If the belt cover is not installed, hands, clothing or
the stitched fabric may become entangled in the belt
resulting in injury or damage.
CAUTION
016
⑤
014
④
015
017
（1） Insert the screws ② halfway into the oil
reservoir ①.
（2） Fit the holes on the supplementary belt cover
③ over the heads of the screws ②, slide the
cover to the rear and tighten the screws ②.
（3） Attach the belt cover(lower) ④ to the sewing
machine with the screws ⑤.
（4） Fit the belt cover(upper) ⑥ onto the belt
cover(lower) ④ and lock in place with the
screws ⑦.
③
②①
②
③
⑥
⑦
④

9
VT2500
2. Installation
2.6 Thread tension unit installation
（1） Attach the thread tension unit to the sewing
machine with the screws ② ③ and the washers
④ (2 on each left and right.)
（2） Attach the tension release lever connector ⑤
to the lifter lever ⑥ with the screw ⑦.
（3） Press the lifter lever ⑥ downward to check it
moves smoothly.
020
⑧
019 ⑥
⑤
⑦
①②
③
④
④
018
⑨
2.7 Eye guard and finger guard installation
Use the sewing machine with the eye guard ⑧ and the
finger guard ⑨ attached. Also, lower the eye guard ⑧
to the set position when working.
CAUTION

10 VT2500
2. Installation
2.8 Presser lifter pedal installation
Attach the presser lifter shaft(lower) ③ on
the underside of the table and then connect the
presser lifter pedal and lifter lever ⑦ to the
presser lifter shaft(lower) ③ by chain ⑧.
（1） Attach the presser lifter shaft support
① on the underside of the table with the
screws ②.
（2） Pass the presser lifter shaft(lower) ③
through the collar ④ , return spring ⑤ ,
lifter shaft lever ⑥ and presser lifter
shaft support ① as shown in the 󲥬gure.
（3） Check that the presser lifter shaft(lower)
③ turns smoothly.
（4） Move the collar ④ to the left and right
so that the arm of the presser lifter
shaft(lower) ③ is directly beneath the
lifter lever ⑦.
（5） Lock down the arm of the presser lifter
shaft(lower) ③ so that it is parallel to
the lifter shaft lever ⑥.
（6） Connect the arm of the presser lifter
shaft(lower) ③ and the lifter lever ⑦ ,
the lifter shaft lever ⑥ and the presser
lifter pedal by chains ⑧.
①
④
⑤②
③
②③
⑤
④
①
⑥
②
⑥②
①
When attaching pedal to the right side of table When attaching pedal to the left side of table
To presser lifter pedal
To presser lifter pedal
⑦⑧
021 022
①
⑧⑦
200
410
260
270
⑧
⑧

11
VT2500
2. Installation
Turn off the power switch of the motor and check the
motor has stopped before installing the supplementary
cover. Working with the power on can result in injury.
CAUTION
023
③②
①
024
⑥
④
⑤
①
⑦
⑧
2.9 Supplementary cover installation
Attach the supplementary cover ① to the cylinder
front cover ② with the screws ③.
* The fabric edge guides ④ ⑤ can be attached to
the supplementary cover ① with the screws ⑥
⑦ and the washers ⑧.

12 VT2500
3.
Sewing speed and pulley rotating direction
◇ The maximum speed of this sewing machine is
4500 rpm (intermittent operation). When using
it for the first time, run the machine at 15%
to 20% lower speed of its maximum sewing speed
during the 󲥬rst 200 hours (approx. 1 month) so
that it will offer a long service life in good
condition.
◇ Both the motor pulley ② and the machine pulley
① rotate in the clockwise direction.
If the pulleys rotate in reverse direction, oil can not be
properly supplied to parts resulting in sewing machine
breakdown.
CAUTION
025
①
②

13
VT2500
If very little oil is sprayed out from the nozzle despite
a sufficient charge of oil or if there are many bubbles
in the oil, check and replace the oil filter.
CAUTION
4.Lubrication
Turn off the power switch of the motor and check the
motor has stopped before performing work. Working
with the power on can result in injury.
CAUTION
①
026
027
028
②
③
Do not use oil additives as they can deteriorate the oil
resulting in sewing machine breakdown.
CAUTION
4.1 Lubricating oil
◇ Lubricating oil: YAMATO SF OIL No.28
◇ Capacity of oil reservoir: 600 mL
4.2 Lubricating
When using a sewing machine for the first time
A sewing machine is shipped with the oil drained.
Before using a sewing machine for the first time,
charge with oil. To add oil, remove the rubber seal
plug ① labeled "OIL" and add oil up to the top line
on the oil gauge ②.
Checking point
After starting the sewing machine, check oil is
coming from the nozzle when looking from the oil
sight window ③. If oil is not coming out, check and
replace the oil 󲥬lter (see page 15).