Reliable MSK-8420B Manuale utente

MSK-8400B

MSK-8420B

Industrial Sewing Machine

Instruction Manual

CONTENTS

1. Brief introduction

2. Main specifications

3. Installation and preparation

3.1 Installation

3.1.1 Location of the machine

3.1.2 Installing oilreservoir

3.1.3 Mounting machinehead

3.1.4 Mounting kneelifter

3.1.5 Installing the motor

3.1.6 Connecting theclutch lever tothe pedal

3.1.7 Installing thethread winder

3.1.8 Installing the thread spool stand

3.2 Preparation

3.2.1 Cleaning the machine

3.2.2 Examination

3.2.3 Precaution before start

4. Operation

4.1 Coordination between needle thread and sewing material

4.2 Installing theneedle

4.3Winding the bobbin thread

4.3.1 Winding method

4.3.2 Winding adjustment

4.3.3 Threading

4.3.4 Stich length and reverse sewing control

4.3.5 Setting thebobbin

4.3.6 Drawing threadfrom the bobbin

5. Machine adjustment

5.1 Thread tension adjustment

5.2 Adjusting the pressure of presser foot

5.3 Use andadjustment of thesafety clutch device

5.3.1The function ofthe safety clutchdevice

5.3.2 Resetting thesafety clutch device

5.3.3 Regulating thestrength on thesafety clutch device

5.4 Upper feed adjustment

5.5 Presser foot lift volume adjustment

5.6 Hook oil amount adjustment

Operation instruction

1. MSK-8420B Arm parts

2. MSK-8400B Arm parts

3. Upper shaft and presser foot parts

4. MSK-8420B Needle bar motion and Lower feed parts

5. MSK-8400B1 Needle bar motion and Lower feed parts

6. Rock shaft and thread looping parts

7. Rock shaft and thread looping parts

8. Stitch length adjusting parts

9. Knee lifter parts

10. Lubrication parts

11. Lubrication parts

12.Accessories

MSK-8420B

MSK-8400B

MSK-8420B

MSK-8400B

Parts manual

11 14

15 18

19 22

23 26

27 30

31 34

35 38

39 40

41 44

45 48

49 52

53 54

small

big

oil felt

-1-

Both the models adopt straight twin-needle and two horizontal hooks with auto lubrication for thread

looping, sliding lever for thread take up to form two lines of lockstitch seam. The upper shaft and lower

shaft is connected by ball bearing and driven by teeth-type synchronic belt; plunge oil pump lubrication

system. They adopt the compound feed mechanics of feed dog, needle bar and presser foot, even if for long

stitch length and long material, They can deal with them freely.

They are widely used in factories of suitcase, tent, cushion, leather goods, apparel, mat, etc..

The difference between the two models:

MSK-8420B adopts twin-needle, two large horizontal hooks with auto lubrication. With the parts it can

form ten different needle gauges.

MSK-8400B adopts single needle and form single line double lockstitch form.

1. Brief introduct oni

1 Application: medium and heavy duty materials

2 Max. sewing speed: 2000 spm

3 Max. Stitch length : 9 mm

4 Needle barstroke: 36 mm

5 Presser footlift height: 8mm(by hand); 16mm(byknee)

6 Hook: large horizontal hook with auto lubrication

7 Needle: DP 17 Nm125~180

8 Lubrication: pump auto lubrication (partial of manually oiling)

9 Needle gauge: (Twin-needle) 6.4, 3.2, 4, 4.8, 8, 9.5, 12.7, 16, 19, 25.4

10 Motor power: 0.37 kw (clutch motor)

2. Main Technical Specification

3.1 Installation

3.1.1 Location of the machine

To ensure a smooth running, the machine should

be located on rigid and flat floor. The insert of

rubber mat between machine stand and floor is

recommended for further reducing the running noise

and vibration.

3.1.2 Oil Reservoir Installation(Fig.1)

Put the oil reservoir into the table cutout, and

place the four cushions on the four corners of the

cutout, and place oil felt into the oil reservoir.

3.1.3 Mounting machine head(Fig.2)

Make the hinge A of machine headengaged with

hinge socket B on the table, then turn the machine

head freely till it is seated on the frame of table

cutout.

()

3. Installation and preparation

-2-

3.1.4 Knee control presser foot lifter installation(Fig.3)

a. Installing

Install Connector A , Bell Crank B , Bell C

in the order shown in Fig.3.

b. Adjustment (Fig.4)

In the order of the following:

1.When the presser foot is at its lowest posi-

tion, keep the crank in the position shown by b

in the figure, turn Knee Control Stop Adjusting

Screw C to touch with the oil reservoir, and

tighten the nut of Screw C .

2. When operate by knee, the presser foot lift

volume is controlled by Screw B . Turn the

presser foot lever down, make the bell in the po-

sition shown by a in the figure, lift the presser

foot to 13 mm, adjust Screw B to touch the oil

reservoir. Then tighten the nut of Screw B .

3.1.5 Installing the motor (Fig.5)

Align machine balance wheelbelt groove A with

motor pulley belt groove B by moving the motor C

leftward or rightward.Be sure the belt is not touch

with table.

() () ( )

()

() ( )

10 - 12 mm

20¡«30

-3-

ABA

3.1.6 Connecting the clutch lever to the pedal (Fig.6)

1)The optimum tilt angle of pedal A with floor

is approx.30 degree.

2)Adjust the clutch of the motor so that clutch

lever C and draw bar B run in line.

3)The machine balance wheel should rotate coun-

terclockwise for normalsewing when viewfrom opposite

side of balance wheel G . The motor is rotated in the

same direction. The rotation can be reversed by rever-

sing (turn over 180 deg.)the plug of motor.

4)Adjust the tension of V-belt F by moving the

motor vertically. The proper tension of V-belt is a slack

of 10-12mm when the belt is depressed at the belt span

by finger.

3.1.7 Installing the bobbin winder (Fig.7)

Align pulley B of bobbin winder with outside of

belt C and should be kept a properclearance between

them , so that pulley B could be contacted with belt

after the stop latch thumb lever A depressed, thereby

belt drives thepulley B while machine running. After

check bobbin winder is in parallel with belt slit E

of table, fastened by two wood screws D .

3.1.8 Installing the thread spool stand (Fig.8)

Locate thread spool stand at the right front of

the table, note that spool rest may not obstruct when

machine head is turned backward, then tighten wood

screw.

3.2 Preparation

3.2.1 Cleaning the machine

Before delivery, the machine parts are coated with

rust preventive grease, whice may be hardened and con-

taminated by dust during storage and shipment. The

grease must by removed by clean cloth with gasoline.

()

() ()

()

( )

()

oil mark

oil screen

-4-

3.2.2 Examination

Though every machine is confirmedby strict inspec-

tion and test before delivery, the machine parts may be

loosed or deformed after long. distance transportation

with jolt. A thorough examination must be performed

after cleaning the machine . Turn the balance wheel to

see if there is running obstruction, parts collision,

uneven resistance or abnormal nosie. If these exist,

adjustment must be made accordingly before run.

3.2.3 Precaution before Start

a. Oiling (Fig.9)

Oil amount should be filled according to the marks

in the oil reservoir. Mark (H) refers to the highest

of oil amount;(L) refers to the lowest, be careful that

the oil amount should not be lower than Mark (L),

otherwise the machine parts can not be fed with oil

and cause overheat and collision.

Be sure to use machine oil HA-8 or HJ-7

b. When the machine starts for the initial time or

reuse after a long period of time, the proper oil

amount should be filled in sections of machine shown

by arrows in Fig10,11.When it is in operation, observe

the oil sparking in oil screen to check the oil

condition.

Note: when the machine needs drop oiling , do not

start before drop oiling.

c. When a new machine starts running, for extending

its life, please run at a medium and low speed (1000

spm) for about a month and then raise the speed

gradually.

d. Please turn off the power when it is not in use

or the operator leaves away from it .

e. Replace the oil every month. When replacing,

fully drain off the old oil in the reservoir and add

the new one.

f. The needle gauge options are: 6.4, 3.2, 4, 4.8, 8,

9.5, 12.7, 16,19, 25.4 For getting it , the throat plate,

presser foot or alternating foot , needle holder, feed

dog, left and right sliding plates, thread guide should

be changed. It is provided with 6.4mm when it leaves

off the factory, For the other size, the relevant parts

can be ordered from the factory.

-5-

long groove

long groove leftward

clearance

(a)

(d)

(b)

(c)

4.1 Coordination betweenneedle, thread and sewing

material

Please use needleDP 17,Nm125-180.The coarseness

of needle should be in accordance with the nature of

material. If stitch on heavy duty material with a slim

needle, the needle will be easily bent, skip or thread

breakage occurs, on the contrary, stitch on tightly woven

material with a very coarse needle, the material will

be destroyed with over-big needle. So the needle and

thread should be properly selected.

4.2 Needle installation(Fig.13)

Turn the balance wheel to lift needle bar to the

highest position, loosen Needle Set Screw A , fully

insert the needle shank upto the bottom of needle

socket, keeping the long grooves of the two needles

opposite with each other,then tighten Screw A , For

single needle, keep the long groove of needle facing

the left of the operator. See Fig (b).

Note: Fig.(c) : insufficient insertion.

Fig.(d) : wrong direction of needle long groove

in insertion.

4.3 Winding the Bobbin thread

4.3.1 Winding method(Fig.14)

1) Install bobbin A to bobbin winder spindle B .

2) Pass thread C from spool through the eye 1 on

tension bracket E . Pass ti between tension discs 2 ,

and then wind the end of the thread a few turns on

the bobbin.

3) Push stop latch thumb lever D down to lock the

bobbin, the winder pulley F is thereby pressed on

belt G .

4) Start the machine to wind thread.

Note when thread is wound without sewing opera-

tion, be sure to keep the presser foot lifted.

5) When the thread isfully wound, the bobbin winder

stop latch automatically release the bobbin winder,

thus stopping the winding motion.

()

() ()

()

4. Operation

single needle

L7 L5 L4 L3' L3 L2' L2 L

R7 R1

-6-

A A AB B

L11 R11

L10

L11

L12

L13

R10

from right to left from left to right

detail chart

thread

R11

R12

R13

4.3.2 Winding adjustment (Fig.15)

1) Wound bobbin thread should be neat and tight,

if not , adjust the thread tension by turning tension

stud thumb nut A of bobbin winder tension bracket.

Note: nylon or polyester thread should be wound

with light tension , otherwise bobbin D might be

broken or deformed.

2) When the wound thread layer does not present a

cylindrical shape as in Fig.15a, loosen tension bracket

screw B and move tension bracket C leftward or

rightward. If thread is wound as shown in Fig, 15b,

move the tension bracket rightward, while if thread

is wound as shown in Fig.15c,move the tension bracket

leftward, After adequately positioning the tension

bracket, tighten screw B .

3) Do notover fill thebobbin , theoptimum capacity

of thread will fill about 80% of bobbin ouside diameter,

this can be adjusted by stop latch screw E .

4.3.3 Threading (Fig.16)

Every thread should be drawn through Thread Hole

A , when use light and smooth thread (polyester or long

silk thread), it should be drawn through Hole B , Keep

the thread take-up lever in its highest position ,draw

every thread in the following numerical order.

4.3.4 The stitch length and forward and reverse sewing

control (Fig.17)

The stitch length can be regulated by Stitch

Length Dial A . Turn it counter-clockwise to expand

its length and clockwise to shorten its length . The

numbers on Dial A show the sizesof the stitchlength

in mm.

For reverse feed, press down Release Feed Lever

C to perform reverse sewing , Release the lever, the

reverse feed lever can reset automatically and the

forward sewing is resumed.

()

() ()

()

Normal

-7-

hook

thread

sliding plate

hook

sliding plate

tension adjusting screw

loosen

tighten

inner stop piece

thread

4.3.5 Placing bobbin (Fig.18)

Note: when bobbin is placed into the bobbin case,

the thread should be wound properly in the correct

direction shown inthe figure.

4.3.6 Drawing thread from the bobbin (Fig.19)

a. Draw thethread end to Bobbin Slot (1) shown in

the figure, and pull it out down through theinner

bobbin stop piece.

b. Hold the thread with left hand , turn the balance

wheel slowly andget the bobbinthread, then draw

them a little apart from the presser foot.

5.1 Thread tension adjustment

All forms of stitches are shown in Fig.20.

The normal stitch of sewing machine is shown as

Fig.(A) If stitchis abnormal , the puckering and thread

breakage will occur, and the needle thread tension and

bobbin thread tension should be adjusted so that the

normal stitch can be obtained.

a. If the stitch seam shows as Fig. 20B, indicates

that the needle thread or bobbin thread tension

is too loose, then turn the thread tension screw

counter-clockwise to release the needle thread

pressure; or turn the adjusting screw with a

screwdriver to increase the bobbin thread ten-

sion.( see Fig.20,22 )

5. Machine Adjustment

thread

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