Yamato VG3511-8F Instruction Manual

Instruction Manual

HIGH SPEED CYLINDER BED 3-NEEDLE

INTERLOCK STITCH MACHINE

VG3511-8F

Thank you for having purchased the Model VG3511-8F.
Before using your VG3511-8F, 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.

CONTENTS

Safety instructions ⅰ－ⅳ

1. Name of each part 1

2. Installation 2

2.1 Table cutting diagram 2

2.1.1 Table top type (Type A: standard) 2

2.1.2 Table top type (Type B) 3

2.2 Table top type 4

2.3 Motor, belt and pulley 5

2.4 Hanging belt 6

2.5 Belt cover 6

2.6 Eye guard and finger guard 7

2.7 Thread guide plate 7

2.8 Accessories 8

3. Sewing speed and rotating direction of pulley 9

4. Lubrication 10

4.1 Lubricating oil 10

4.2 Lubricating 10

4.3 Changing oil 11

4.4 Checking and replacing oil filter 11

5. Proper operation 12

5.1 Needle system 12

5.2 Installing needles 12

5.3 Threading 13

5.4 Adjusting thread tension 14

5.5 Pressure of presser foot 14

5.6 Adjusting position of presser foot 14

5.7 Adjusting movement of differential feed dog 15

5.8 Adjusting stitch length 16

5.9 Hemming guide(left) 17

5.10 Trimming width of fabric 17

5.11 Hemming guide(right) 18

5.12 Fabric guide(right) 18

5.13 Raising upper feed roller (with puller mechanism) 19

5.14

5.15 SP device and HR device 20

5.16 Cleaning the machine 20

Pressure of upper feed roller (with puller mechanism)

19

CONTENTS

6. Adjustments 21

6.1 Needle thread tension 21

6.2 Top cover thread tension 23

6.3 Looper thread tension 23

6.4 Needle and spreader 24

6.4.1 Spreader 24

6.4.2 Top cover thread guide 25

6.4.3 Top cover thread eyelet 25

6.5 Distance between needle and looper 26

6.6 Using timing gauge 26

6.7 Height of needle 27

6.8

6.9 Needle and needle guard(rear) 28

6.10 Needle and needle guard(front) 29

6.11 Height of feed dog 29

6.12 Changing range of differential ratio 30

6.13 Presser foot lift 31

6.14 Replacing fabric presser 32

6.15 Feeding amount of puller (with puller mechanism) 33

6.16

Needle and back-and-forth position of looper

Pressure of clutch tension spring (with puller mechanism)

27

33

7. Trimming mechanism 34

7.1 Adjusting trimming position of fabric 34

7.2 Adjusting suction pipe(front) 35

7.3 Adjusting suction pipe cover 35

7.4 Removing and resetting lower knife 36

7.5 Removing and resetting upper knife 37

7.6 Adjusting upper knife stroke 38

7.7 Sharpening knives 39

8. Specifications 40

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.

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.

Safety instructions

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 ± 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 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

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 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.

i

ii

Safety instructions

(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 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.

supply switch.)

(4) Be sure to remove the gasket too, when the

cover removed at the maintenance, inspec­tion, 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 sew­ing 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 ma­chine damage.

NOTE is used to emphasize essential informa­tion.

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, in­spection, and repair. (If using a clutch mo­tor, take care that the motor keeps turning
for a while even after turning off the power

iii

Safety instructions

4-2 Alert pictorial markings

This mark indicates the warning
which, if not heeded, could re-

sult in death or Serious injury.

This mark indicates the caution
for high temperature.

This mark indicates the warning
which, if not heeded, could re-

sult in death or Serious injury.

Hig h - volta g e appl i es in t h e

control box. This label indi­cates that electric shock may be
caused.

Hi gh-voltage applies

in the contro l b o x .
This labe l indicates
that e l ec t ri c 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 su r e t o o p e r a t e

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.

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

This label indicates
that remova l o f t h e
safeguards and works
except for sewing per­f o rm an ce wh i l e t h e
powe r s up p ly switc h
is on are prohibited.
(For details, see the
next page.)

If not connected earth line,
static el e c t r i ci t y may be
generated and inflict injury
on person. In addition, the
malfunction of electric sys­tem may cause injury to per­son.

C h ec k t h e r o t at in g
direction of machine
pulley agrees with '

R O T AT I N G - D IR E C T I O N
SYMBOL'.

Safety instructions

Rotating direction symbol

iv

. Name of each part

1

Thread guide plate

Oil sight window

Needle bar guard

Presser spring regulator

Needle thread
take-up guard

Seal plug
(lubricating)

Needle thread eyelet

SP device

Handwheel

Thread
tension
spring cap

Adjusting screw
(differential feed)

Finger guard

Fig. 1-1

Eye guard

Suction pipe

Screw
(draining oil)

Hemming guide(right)

Slide cover

1

Front cover

Main feed bar
adjusting screw

Differential
feed graduations

Oil sight gauge

VG3511-8F

2

VG3511-8F

. Installation

2

2.1 Table cutting diagram

2.1.1 Table top type(Tyep Ａ : standard)

center of pulley

3- Φ 9.5

(installing hole for motor)

4-Φ 9 Φ 16 countersunk hole

Ttable dimensions: 1200×595×50

operator

depth 16

Fig. 2-1

Section X-X

Refer to the instruction of the motor

for dimensions A, B, C, and D.

Section Y-Y

3

VG3511-8F

2.1.2 Table top type (Type Ｂ )

2. Installation

3- Φ 9.5

(installing hole for motor)

center of pulley

4- Φ 9 Φ 16countersunk

hole depth 16

Table dimensions: 1200×595×50

operator

Fig. 2-2

Section X-X

Refer to the instruction of the motor

for dimensions A, B, C, and D.

2. Installation

4

VG3511-8F

2.2 Table top type

Install a machine correctly referring to Figs. 2-3 and 2-4.

sewing

⑤

machine

①

②

②
③

④

Fig. 2-3

⑤

⑤

⑤

machine table

sewing
machine

Fig. 2-4

⑤

②

③

①

②

machine
table

④

2. Installation

5

VG3511-8F

2.3 Motor, belt and pulley

See the instruction manual for the motor used and install
the motor properly.

64.5 ㎜

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 with toeing down the pedal.

Note: Table 1 shows the outside diameter of the motor

pulley, rpm of the machine, and size of the belt
when using the clutch motor of 3-phase, 2-pole,
400W(1/2HP).

The outside diameter on the table shows the near­est size to the calculated values based on the com­mercial available pulleys at intervals of 5 mm.

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.

40°

5.5 ㎜

10 ㎜

M-type of V-belt

Fig. 2-5

Outside
diameter
of pulley

(㎜)

90 4600 M40 M33

95 4850 M40 M34
100 5100 M41 M34
105 4550 5350 M41 M34
110 4750 M41 M35
115 5000 M42 M35
120 5200 M42 M35
125 5400 M42 M36

Sewing speed

of machine

(sti/min)

50 Ｈｚ 60 Ｈｚ

Size of belt

Semi-

submerged

Table 1

Fully-

submerged

Servomotor:

Calculate the outside diameter of a motor pulley from the
formula as below.
Or see Table 2 to select a proper motor pulley.

Outside diameter Usual sewing speed

= × 64.5 + 5 mm

of motor pulley Servomoter speed

Belt

Use a V-belt of M type.
For belt size, refer to Table 1.

Sewing speed

of machine

(sti/min)

4200 95 80
4500 102 86
4700 106 89
5000 113 95
5500 117 98
5500 123 104

Outside diameter

of motor pulley ( ㎜ )

rpm of servomotor

3000 rpm 3600 rpm

Table 2

2. Installation

6

VG3511-8F

2.4 Hanging belt

Before hanging belt, ALWAYS turn the power switch OFF
and check that the machine has already stopped.

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 pul-

ley.

(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 .

②

①

10 - 20 ㎜

③

④

Fig. 2-6

2.5 Belt cover

Be sure to install belt cover to prevent you from injuring
and a material from being caught by the belt.

(1) Install the belt cover ⑤ . (Fig. 2-7)
(2) Push the belt cover support ⑥ to the belt cover ⑤ to

install it.

(3) Fix the belt cover(lower) ⑦ on the machine table. (Fig.

2-9)

see from back
side of machine

⑤

⑥

⑤

Fig. 2-7

Fig. 2-8

⑦

Fig. 2-9

2. Installation

7

VG3511-8F

2.6 Eye guard and finger guard

To ensure safe use, always install the eye guard ① and the
󳞛nger guard ② on the prescribed position when operating.

①

②

Fig. 2-10

2.7 Thread guide plate

(1) Put the screws ③ into the hole of the thread

guide plate ④ and push it to the left.

(2) Fix the thread guide plate ④ with the screws ③ .

③

④

Fig. 2-11

2. Installation

2.8 Accessories

Install the accessories as the suction pipe(rear), the suction pipe support, the 󳞜exible hose and the speed con­troller on the machine as follows:

(1) Install the speed controller ⑧ in the screw hole on the bottom of the lower knife holder.
(2) Insert the suction pipe(rear) ① into the hole of the bottom of the lower knife holder bracket ② and 󳞛x them

with the screw ③ .
(3) Remove the screws ④ at the rear of the machine frame.
(4) Install the suction pipe support ⑤ with the screws ④ at the place the screws ④ were located.
(5) Install the suction pipe(rear) ① on the suction pipe support ⑤ .
(6) Insert the 󳞜exible hose ⑦ 󳞛tted with the hose band ⑥ into the suction pipe(rear) ① . Then, 󳞛x them with

the hose band ⑥．

⑥

⑦

④

⑤

③

①

Fig. 2-12

②

Ａ

⑧

　ＮＯＴＩＣＥ

If tightened the screw ③ excessively, the suction pipe(rear) ① may be deformed. That may be difficult to remove
it when clogged with chips.

VG3511-8F

8