Yamato VFK2560-8 User manual

Thank you for having purchased the Model VFK2560-8 class.
Before using your VFK2560-8 class, please read the instruction manual and
understand the contents well.
After reading the instruction manual, please keep it in a location where it is
easily accessible to the operator.
Instruction Manual
4 NEEDLE HIGH SPEED FLATBED FLATSEAMER
VFK2560-8 class

CONTENTS
Safety instructions ⅰ - iv
1. Name of each part 1
2. Installation 2
2.1 Semi-submerged type 2
2.1.1 Table cutting diagram 2
2.1.2 Installation 3
2.1.3 Installing supplimentary table 4
2.2 Full-submerged type 5
2.2.1 Table cutting diagram 5
2.2.2 Installation 7
2.3 Motor, pulley and belt 8
2.4 Hanging belt 9
2.5 Belt cover 9
2.6 Thread guide plate 9
2.7 Installing SC30 device 10
3. Sewing speed and rotating direction of pulley 11
4. Lubrication 12
4.1 Lubricating oil 12
4.2 Lubricating 12
4.3 Changing oil 13
4.4 Checking and replacing oil 󲶻leter 13
5. Proper operation 14
5.1 Opening and closing covers 14
5.1.1 Semi-submerged type table + supplimentary table 14
5.1.2 Full-submerged type table 14
5.2 Needle system 15
5.3 Installing needles 15
5.4 Threading 16
5.5 Adjusting thread tension 17
5.6 Pressure of presser foot 17
5.7 Up-and-down position of presser foor 18
5.8 Adjusting differential feed dog 19
5.9 Adjusting stitch length 20
5.10 Height of lower knife 21
5.11 Use of lap former 21
5.12 Adjusting lapped width of upper fabric 22

CONTENTS
5.13 Adjusting the fabric lapping(both-side fabric edge trimming) 23
5.14 Adjusting SC30 device 24
5.15 HR device and SP device 25
5.16 Cleaning 26
6. Adjustments 27
6.1 Needle thread tension 27
6.2 Top cover thread tension 28
6.3 Looper thread tension 29
6.3.1 Looper thread tension 29
6.3.2 Position of looper thread take-up 30
6.4 Height of presser foot 31
6.5 Replacing presser foot spring plate 31
6.6 Replacing and adjusting knives 32
6.7 Height of needle bar 33
6.8 Looper 34
6.8.1 Installing angle and height of looper 34
6.8.2 Distance between looper and needle 34
6.9 Back-and-forth position of needle and looper 35
6.10 Needle and needle guard 36
6.10.1 Needle guard(rear) 36
6.10.2 Needle guard(front) 37
6.11 Height of feed dog 37
6.12 Needle and spreader 38
6.12.1 Spreader 38
6.12.2 Top cover thread guide 39
6.12.3 Top cover thread eyelet 39
6.12.4 Top cover thread pusher 40
6.13 Replacing presser foot 41
7. Specifications 43
Attention
The parts used for this product are subject to change without notice. If such a change is made, any part of the contents and illustrations of
this instruction manual may not conform to this product.
In preparing the instruction manual, we have made our best efforts for making it free of any error or omission. If any error or omission
should yet be found, it might not be rectified immediately.
Attention
◇ This instruction manual is designed mainly for technicians, but it is advisable that also operators read the instructions with mark to
use the machine properly.
◇ The numbers in lower left corners of figures are figure numbers. We use them in texts as needed for your reference.

i
Safety instructions
２．Installation and preparation
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 op-
eration 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 sew-
ing head and any reaction while operating.
(2) Maintain a comfortable working environment
with considering the lighting and the ar-
rangement of sewing machine so that the op-
erators can work smoothly.
(3) When installing the control box and the re-
lated parts on the sewing machine, take care
about the posture of the worker.
(4) Install the drive unit correctly according
to the instruction manual.
2-3 Wiring
(1) Never connect the plug for power supply un-
til 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 connec-
tion cords.
(4) Connect the cords away from the driving
parts.
(5) Place the ground wire securely to the desig-
nated 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 󲶻ll or drop lubrication oil be-
fore 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.
１． To ensure safe use
Always observe the following instructions to en-
sure the safe use of the industrial sewing ma-
chines and devices.
1-1 Application and purpose
The sewing machine is designed to improve pro-
ductivity 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 humid-
ity 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 ± 10 %
of the rated voltage.
- Place where power capacity necessary for the
used motor speci󲶻cations cannot be secured.
- Place where strong electric or magnetic 󲶻elds
are generated such as near large-output high
frequency transmitters or high frequency weld-
ing 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 ma-
chine 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.

ii
Safety instructions
３．Maintenance, inspection, and repair
(1) Follow the instruction manuals for mainte-
nance, inspection, and repair.
(2) Entrust the maintenance, inspection, and re-
pair to specially trained personnel.
(3) Be sure to turn off the power supply switch
and make sure the sewing machine and motor
completely stop before the maintenance, in-
spection, and repair. (If using a clutch mo-
tor, take care that the motor keeps turning
for a while even after turning off the power
supply switch.)
(4) Be sure to remove the gasket too, when the
cover removed at the maintenance, inspec-
tion, and repair. If not removed, may be
injured at the edge of gasket.
(5) Do not modify the sewing machine by the
customer's judgment.
(6) Be sure to use original replacement parts
for repairs or maintenance.
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 sew-
ing machine from being damaged.
Please follow the instructions.
4-1 Meanings of caution signs
WARNING indicates potentially hazardous situ-
ations 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 ma-
chine damage.
NOTE is used to emphasize essential informa-
tion.
(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, finger
guard, and eye guard.
(2) Never place the 󲶻nger, hair or objects un-
der 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 oper-
ating, 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.

iii
Safety instructions
4-2 Alert pictorial markings
５．Warning labels on sewing machines
This mark indicates the warning
which, if not heeded, could re-
sult in death or Serious injury.
This mark indicates the warning
which, if not heeded, could re-
sult in death or Serious injury.
High-voltage applies in the
control box. This label indi-
cates that electric shock may be
caused.
This mark indicates the caution
which, if not grounded, the ma-
chine or device could malfunc-
tion and could result in per-
sonal injury.
This mark indicates the caution
for high temperature.
This label indicates
that removal of the
safeguards and works
except for sewing per-
formance 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 af󲶻xed on the
safeguards. Considering the
operation, it is not affixed
on the finger 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 con-
tinuously. To prevent a burn,
take care not to touch.
Check the rotating
direction of machine
pulley agrees with '
ROTATING-DIRECTION
SYMBOL'.
If not connected earth line,
static electricity may be
generated and inflict injury
on person. In addition, the
malfunction of electric sys-
tem may cause injury to per-
son.

iv
Safety instructions
６. Other factor which may cause injury, precaution against it
Knife mechanism
As the knife trimming mechanism is moving to
the right-and-left while sewing, if your hand
holding the fabric comes close to the mechanism,
your hand may be in danger of being struck or
pinched in the gap below.
Knife mechanism
Rotating direction symbol

1
VFK2560-8
1.󰾳Name󰾳of󰾳each󰾳part
Fig. 1-1
Handwheel
Thread guide plate
SP device
Seal plug (lubrication)
Oil sight window
Needle thread take-up
Needle bar cover
Presser spring regulator
Presser foot height adjuster
Needle thread take-up guard
Feed regulating pushbutton
Side cover
Differential feed
graduation
HR cup
Presser foot
Chip guard
Lap former Supporting plate for looper
thread take-up
Front cover
Oil sight gauge
Looper thread
take-up cover
Thread tension
spring cap

2
VFK2560-8
2.1󰾳Semi-submerged󰾳type
2.1.1 Table cutting diagram
2.󰾳Installation
Fig. 2-1
Standard
Table dimensions: 1200×595×40
Operator
center of pulley
Refer to the instruction manual of the motor for dimensions A, B, C, and D.
Section Y -Y (1/2)
Section X -X (1/2)

3
VFK2560-8
2.1.2 Installation
4㎜
2. Installation
Fig. 2-2
Install a machine correctly referring to Figs. 2-2 and 2-3.
Set the screws ② in the supporting board ① and cover
the screws ② with the rubber cushions ③ . Fix the the
supporting board ① to the machine table and install a
machine securely on the rubber cushions ③ .
☆ The number of spacers ④
sewing
machine
machine table
Fig. 2-3
①
④
④
③
③
③
②
②
①
Thickness of table The number of spacer ④
40 ㎜ 3 pcs. × 4=12 pcs.
45 ㎜ 2 pcs. × 4= 8 pcs.
50 ㎜ 1 pc × 4= 4 pcs.
Table 1

4
VFK2560-8
2.1.3 Installing supplementary table
2. Installation
Assembly
(1) Mount the adjustable feet ② on the adjustable foot
plate ① (3 sets).
(2) Mount (1) above onto the supplementary table ｂｙ wood
screws ③ .
(3) Turn the adjustable feet and adjust their heights so that
the top of the supplementary table and cloth plate (small)
⑩ are made level at the same height, and secure the
feet ② using the nuts ④ .
(4) Adjust the supplementary table stay (lower) ⑤ and stay
(upper) ⑥ to the same height as the base of adjustable
feet ② , and join them using the screw ⑦ .
Installation
Place the supplementary table on the machine, and anchor
it to the machine table using the wood screws ⑨ at the
position where the supplementary table stays ⑧ press
down on the adjustable foot ② at the rear left.
Tighten the wood screws ⑨ so that the supplementary
table stays ⑧ turn.
The supplementary table stays ⑧ must be
mounted without fail in order to ensure that the
supplementary table will not turn over.
Fig. 2-4 Supplementary table
Section A - A ①
②
③
④
⑦
⑤
⑥
⑨
⑧
Fig. 2-5
Fig. 2-6
Fig. 2-7
②
⑨
⑦
②
thickness 20 ㎜
⑩

5
VFK2560-8
2.2󰾳Full-submerged󰾳type
2.2.1 Table cutting diagram
2. Installation
Standard
Fig. 2-8
center of pulley
Table dimensions: 1200×595×40
Operator
3- φ 9.5 installing hole of motor
Section H - H
magnet
magnet
magnet
Section G - GSection F -FSection E - E
Refer to the instruction manual of the motor for dimensions A, B, C, and D. Magnet : Shown in the diagram are the reference positions where the magnet catches are to be installed.

6
VFK2560-8
2. Installation
Fig. 2-9
Fig. 2-10
Auxiliary table thickness 20 ㎜
Supporting board
Table
Supporting board
“155” in the above 󳞛gure is the distance to the bottom of the
supporting board so it must be set to the dimension where
there will be no interference between the motor control panel
and the bottom and back end of the supporting board.
thickness 35 ㎜

7
VFK2560-8
2.2.2 Installation
①
①
②
③
2. Installation
Fig. 2-11
Install a machine correctly referring to Figs. 2-11 and
2-12.
Set the screws ② in the supporting board ① and cover
the screws ② with the rubber cushions ③ . Fix the the
supporting board ① to the machine table and install a
machine securely on the rubber cushions ③ .
Fig. 2-12
machine
table

8
VFK2560-8
2.3󰾳Motor,󰾳pulley󰾳and󰾳belt
2. Installation
See the instruction manual for the motor used and install
the motor properly.
Clutch motor:
To install the clutch motor, align the center of the machine
pulley with that of the motor pulley when the motor pulley
shifts to the left while toeing down the pedal.
Note: Table 2 shows the outside diameter of the motor
pulley, rpm of the machine, and size of the belt
when using a clutch motor of 3-phase, 2-pole, 550
W (3/4 HP).
The outside diameter on the table shows the
nearest size to the calculated values based on the
commercial available pulleys at intervals of 5 ㎜ .
Use only those motor pulleys applicable to the machine. If
not applicable, the sewing machine will be over maximum
and it can cause the damage to the machine.
Servomotor:
Use a servomotor with 500 W or more.
Calculate the outside diameter of a motor pulley from the
formula as below.
Or see Table 3 to select a proper motor pulley.
Outside diameter Usual sewing speed
of motor pulley Servomoter speed
Belt
Use an M type V-belt.
See Table 2 for belt size.
= × 58 + 5 ㎜
Fig. 2-13
M type of V-belt
58 ㎜
5.5 ㎜
10 ㎜
40°
Table 2
Outside
diameter
of pulley
(㎜)
Sewing speed
of machine
(sti/min)
Size of belt
50 Ｈｚ 60 Ｈｚ Semi-
submerged
Fully-
submerged
45 2550 M31 M32
50 2800 M31 M32
55 2600 3100 M31 M32
60 2850 3400 M32 M33
65 3100 3650 M32 M33
70 3300 3950 M32 M33
75 3550 M33 M34
80 3800 M33 M34
Table 3
Sewing speed
of machine
(sti/min)
Outside diameter
of motor pulley ( ㎜ )
rpm of servomotor
3000 rpm 3600 rpm
2700 57 49
3000 63 53
3200 67 57
3500 73 61
3700 77 65
4000 82 69

9
VFK2560-8
①
②
③
④
⑤
2. Installation
⑥
⑦
(1) Put the screws ⑥ into the hole of the thread
guide plate ⑦ and push it to the left.
(2) Fix the thread guide plate ⑦ with the screws ⑥
securely.
2.5󰾳Belt󰾳cover
2.4󰾳Hanging󰾳belt
Fig. 2-14
Fig. 2-15
10 - 20 ㎜
Use the M-type of V-belt.
(1) Hang the belt ① on the machine pulley ② , and then
on the motor pulley ③ while rotating the machine
pulley.
(2) Adjust the belt tension so that the belt has a slack of
10 - 20 ㎜ when its center is pushed with 10 N.
(3) Lock the motor with the adjusting bar ④ .
Before hanging belt, ALWAYS turn the power switch OFF
and check that the machine has already stopped.
Set the belt cover ⑤ . (Fig. 2-15)
2.6󰾳Thread󰾳guide󰾳plate
Fig. 2-16

10
VFK2560-8
2.7󰾳Installing󰾳SC30󰾳device
(1) Install the 30 device ① on the head cover ② with the
screws ③ .
(2) Connect the dust hose ⑤ to the suction pipe ④ .
(3) When using an air compressor, connect the air tube to
the nozzle ⑥ at the end of the suction pipe.
Make separate arrangements to provide the dust bag, air
regulator, air valve and other parts.
①
②
④
⑤
⑥
2. Installation
③

11
VFK2560-8
3.󰾳
Sewing󰾳speed󰾳and󰾳rotating󰾳direction󰾳of󰾳pulley
①
②
The maximum sewing speed is 4000 sti/min and usually
sewing speed is 3500 sti/min.
Run a new machine at speed about 15 - 20% lower than
maximum speed during the 󳞛rst 200 hours (for about one
month) so that a machine can offer a long service life in
good condition.
The rotating directions of the machine pulley ① and the
handwheel ② are clockwise as shown in the 󳞛gure.
Fig. 3-1
If rotated in reverse direction, oil cannot be supplied
properly. It can cause the damage to the machine.

12
VFK2560-8
4.󰾳Lubrication
①
②
③
④
4.1󰾳Lubricating󰾳oil
4.2󰾳Lubricating
Use YAMATO SF OIL No. 28.
When using a new machine, or a machine which has not
been run for a while, supply a few drops of oil to the needle
bar ① .
Remove the seal plug ② indicated “OIL-IN” and supply oil
to the upper line of the oil sight gauge ④ .
Check that oil splashes from the nozzle inside the oil sight
window ③ while running a machine.
If oil does not splash from the nozzle, see “4.4 Checking
and replacing oil 󳞛lter” on page 13.
Too much or insufficient oil can cause oil leakage and
machine trouble. Be sure to keep the oil level between
the lines. Also too much lubrication can cause the oil
scatter and material stain.
Fig. 4-1
Fig. 4-2
Fig. 4-3
Never add additives to the oil.
If added, it can cause the deterioration of the oil and the
damage to the machine.
Before lubricating, ALWAYS turn the power switch OFF and check that the machine has already stopped.

13
VFK2560-8
4. Lubrication
①
②
③
④
Before lubricating, ALWAYS turn the power switch OFF and check that the machine has already stopped.
4.3󰾳Changing󰾳oil
4.4󰾳 Checking󰾳and󰾳replacing󰾳oil󰾳filter
Period of changing:
When using a new machine, change the lubricating oil after
running a machine for 200 hours (for about one month).
After that, change the oil once or twice a year.
Procedure for changing:
(1) Remove the belt cover. (page 9)
(2) Remove V-belt from the motor pulley. (page 9)
(3) Remove the machine from the machine table.
(4) Set a container received the oil under the screw ① .
(5) After removing screw ① , oil is drained.
◆ If the oil filter ② is clogged with dust, lubrication
cannot be done properly.
◆ Remove the oil filter cap ③ and the oil filter ② to
check them every six months. If clogged or cracked,
clean or replace the oil 󳞛lter.
◆ If oil is splashed from the nozzle insufficiently or
includes many bubbles though the oil is sufficiently
kept, check or replace the oil 󳞛lter.
Fig. 4-4
(6) Reset the screw ① .
(7) Change the oil. (See “4.2 Lubricating” on page 12)
(8) Reset the machine on the machine table.
(9) Hang V-belt on the motor pulley and reset the belt
cover. (page 9)
Fig. 4-5
Be careful not to soil the V-belt and the machine pulley
with the oil.
ＮＯＴＥ
Carefully check and replace them without spilling oil
stagnant in the oil filter ② when loosening screw ④ .
ＮＯＴＩＣＥ
O-ring