SunStar KM-1957-7 User manual

Brand: SunStar

Model: KM-1957-7

Category: Sewing machines

Type: User manual

This manual is also suitable for

KM-1967-7

 





 







USER



S MANUAL



KM-1957-7

Post Bed, Wheel Feed with

Driven Roller Foot, 1-Needle

Needle Feed Lock Stitch

Machine with Automatic

Thread Trimmer

KM-1967-7

Post Bed, Wheel Feed with

Driven Roller Foot, 2-Needle

Straight Lock Stitch Machine

with Automatic Thread

Trimmer

Best Quality

Best Price

Best Service



Thank you for purchasing our product. Based on the rich expertise and

experience accumulated in industrial sewing machine production, SUNSTAR

will manufacture industrial sewing machines, which deliver more diverse

functions, high performance, powerful operation, enhanced durability, and

more sophisticated design to meet a number of user’s needs.

2. Please read this user’s manual thoroughly before using the machine. Make

sure to properly use the machine to enjoy its full performance.

3. The specifications of the machine are subject to change, aimed to enhance

product performance, without prior notice.

This product is designed, manufactured, and sold as an industrial sewing

machine. It should not be used for other than industrial purpose.

CONTENTS

1. Machine safety regulations



1-1.

Transporting machine

 6

1-2. Installing

machine

 6

1-3. Repairing

machine

 6

1-4. Operating

machine

 7

1-5. Safety devices  7

1-6. Caution mark position  8

1-7. Contents of marks  8

2. Names of main parts



3. Specifications



4. Installation



4-1. Installation place  11

4-2. Machine delivery  11

4-3. Bending the machine backwards  11

4-4. Table drawing  12

4-5. Installation of Sewing Machine Body  13

4-6. Supplying oil  17

4-7. Trial run (Pedal operation)  18

4-8. Machine Stop Position Check  18

4-9. Back tack button (thread trimming type)  19

4-10. Functional description of function switches  19

4-11. Adjusting Parameter of Sub Thread Adjusting Device  20

4-12. How to Use Dual Tension  20

5. Preparations for sewing



5-1. Installing needle  22

5-2. Bobbin Insertion and Removal  22

5-3. Winding lower thread  23

5-4. Inserting upper thread  24

5-5. Use of knee lifter pad  24

6. Sewing



6-1. Sewing  25

6-2. Adjusting thread tension  25

6-3. Adjusting upper thread length after trimming  28

6-4. Adjustment of the stitch length  28

7. Inspecting and checking



7-1. Daily Cleaning 29

8. Maintenance and repair



8-1. Adjusting the roller presser foot  30

8-2. Adjusting the feed cam 32

8-3. Adjusting the feed dog height  32

8-4. Adjusting the motion direction of feed dog  33

8-5. Adjusting the needle and hook timing  34

8-6.

Adjusting the space between upper face of hook stopper and upper face of needle plate groove

 35

8-7. Adjusting the space between hook and opener  35

8-8. How to adjust the thread trimmer device  36

8-9. How to adjust the gear box (KM-1967-7) 39

8-10. How to exchange the stitch length gauge set  40

9. Pneumatic wiring



10. Causes of troubles and troubleshooting





Machine safety regulations

Safety instructions on this manual are defined as Danger, Warning and Notice.

If you do not follow the instructoins, physical injuries and machine damages might be occurred.

: This indication should be observed definitely. If not, there will be a danger during the installation,

conveyance and maintenance of the machine.

: When you follow this indication, injuries from the machine can be prevented.

: When you follow this indication, error on the machine can be prevented.

Danger

Warning

Notice

1-1) Transporting

machine

Danger

1-2) Installing

machine

Warning

1-3) Repairing

machine

Notice

Those in charge of transporting the machine should have a full understanding of the

machine. The following indications should be followed when the machine is being

transported.

 More than 2 people must transport the machine.

 To prevent accidents from occurring during transportation, wipe off the oil

on the machine compeletely.

The machine may not work properly or breakdown, if installed in certain places, Install the

machine where the following qualifications agree.

 Remove the package and wrappings from the top. Take special

notice on the nails on the wooden boxes.

 Dust and moisture stains and rusts the machine. Install an airconditioner

and clean the machine regularly.

 Keep the machine out of the sun.

 Leave sufficient space of more than 50cm behind, and on the right and left

side of the machine for repairing.

 EXPLOSION HAZARDS

Do not operate in explosive atmospheres. To avoid explosion, do not operate

this machine in an explosive atomsphere including a place where large

quantities of aerosol spray product are being used or where oxygen is being

administered unless it has been specifically certified for such operation.

 The machine is not provided with a local lighting due to the feature of

machine.

Therefore the illumination of the working area must be fulfilled by end user.

[Refer] Details for machine installation are described in 4. Installation.

When the machine needs to be repaired, only the assigned troubleshooting engineer

educated at the company should take charge.

 Before cleaning or repairing the machine, turn off the main power

and wait 4 minutes till the machine is completely out of power.

 Not any of the machine specifications or parts should be changed

without consulting the company.

Such changes may make the operation dangerous.

 Spare parts produced by the company should only be used for

replacements.

 Put all the safety covers back on the machine after the machine has been repaired.

KM-1957 Series is made to sew patterns on fabrics and other similar materials for industrial

use.

Follow the following indications when operating the machine.

 Read through this manual carefully and completely before operating the

machine.

 Wear proper clothes for work.

 Keep hands or other parts of the body away from the machine’s operation

parts(needle, shuttle, thread take-up lever, pulley, etc.) when the

machine is operating.

 Keep the covers and finger guard on the machine during operation.

 Be sure to connect the earthing conductor.

 Turn off the main power and check if the switch is turned off

before opening electric boxes such as the control box.

 Stop the machine before threading the needle or checking after work.

 Do not step on the pedal when turning the power on.

 If possible, install the machine away from source of strong electrical noise

such as high frequency welding machines

1-4) Operating

machine

Warning

Notice

[ Warning ]

Set the machine in motion after installing necessarily a motor cover and a backside cover

and turn off when monitoring or adjusting.

1-5) Safety devices

 Safety label : It describes cautions during the machine operation.

 Thread take-up cover : It prevents any contact between body and take-up lever.



Motor cover : A device to prevent hands, feet and clothing from getting jammed by the motor.

 Backside cover : Device for preventing contact between B/T cylinder and body.

 Label for specification of power : It describes cautions for safety to protect electric shock

during the motors’ rotation. (Voltage input / use Hz)

 Finger guard : It prevent contacts between finger and needle.

 Upper shaft cover: Device for preventing contact between upper shaft and body.

 Upper cover : Anti-finger trapping and insertion of foreign debris device





















      

    

      



    



     

   





     

    





     



    

   









     

      



      

       

     

Caution

1-7)Contents of

marks

Warning

Caution mark is attached on the machine for safety.

When you operate the machine, follow the directions on the mark.

1-6) Caution mark

position







      

  



      

       

    



Names of main parts

 Bobbin winder

 Roller Back Tack Cylinder

 Roller Lifting Lever

 Sewing Machine Pulley

 Roller

 Finger Guard

 Control Box

 Power switch

 Knee Lifting Pad

 Program unit

 Thread stand ass’y

Safety Devices

 Thread take-up cover

 Motor Cover

 Backside Cover

 Upper Shaft Cover

󰥘 Upper Cover































󰥘



Specifications





1-Needle

2-Needle

 

Application

Automatic Thread Trimmer

38mm

Standard horizontal hook

12.6mm(Option)

7mm

Option

Manual

Installation of arm

Direct drive AC servo motor(550W)

Basic specifications

Single phase: 110~240V, 3-phase: 200~240v 50Hz/60H

Thin materials & Medium materials

5mm

DP5#14(#11~#18)

Needle feed

4.2mm

DP17#16(#8~#23)

Lockstitch

KM-1957-7

KM-1967-7

Max. Sewing speed

Application

Max. Plate width

Needle

Feeding

Needle bar stroke

Hook

Stopping the vertical motion of needle bar

Auto knee lifting

Lubrication type

Bobbin winder

Main motor

Auto back tack

Thread trimming

Power supply

Automatic

Manual

The amount

of the roller lift

Model

Spec.



Option Specifications

Device Name

Auto Knee Lifting System



Model Application

Production Counter

Material Edge Sensor

Standing Pedal











Solenoid structure lifting the pressure foot automatically by pulling the pedal in

single stage back

󰢠 Max. stroke 31mm

󰢠 Input voltage: DC 24V(DC 24~46V)

󰢠 Inhaling force of 10mm of stroke: 24kg

As a production counting device, the completed quantity is marked on the

program unit panel and the functions such as add-subtract, modification,

residual sign and other implementation rate are displayed

The device that makes the machine stopped automatically without stopping a

pedal by detecting material edge or thickness has two types of sensors: the

material edge sensor SEDG-1B and material thickness sensor SEDG-2B.

As the essential device when one worker operates several sewing machines,

the accelerator pedal, thread trimming pedal, presser foot pedal, lifting pedal

are installed separately. There are the fixed speed type SPDL-1, EDPL-1 and

the variable speed type SPDL-2, EDPL-2.

3,500Spm 3,000Spm



Installation

4-1. Installation place

1. Do not install the machine near television, radio or

telephone; or the operation of machine can be interfered with

by the noise from the appliances.

2. Connect the ground (earth) wire. An unstable connection

may result in malfunction

4-2. Machine delivery

1. There should be two people to move the machine, as in the

Figure.

4-3. Bending the machine backwards

1. Bend the machine backwards with two hands grabbing

upper part of the body. Make sure to press the lower part of

the board leg of the machine, or the whole body of machine

falls backwards, leading to physical injuries.

[ Figure 3 ]

[ Figure 1 ]

[ Figure 2 ]

Notice

Only trained technicians should install and wire up the machine.

The machine weighs over 55kg. More than two persons should install the machine.

Do not plug in the machine until installation is completed.

If the operator mistakenly steps down on the pedal with the plug in, the machine will start

automatically and can cause physical injuries.

Use both hands when bending the machine backwards or returning it to the original position.

Using only one hand can lead to severe hand injuries due to the weight of the machine.

2. Return the machine to its original position

1) Clear the table of tools.

2) With the right hand, return the machine to its original

position, while grabbing sideboard with the left hand.

[ Figure 4 ]

[ Figure 5 ]

4-4. Table drawing

Please use the table provided by Sunstar. When using self-made table , the thick of table should be more than 40mm. Please use

table strong enough to sustain the weight of the machine.

1. Table Drawing

4-5. Installing body of sewing machine

1. Hinge Rubber

1) As in the figure, assemble two-hinge rubbers  on the

table.

2) As in the figure, fix the hinge rubbers with nails .

3) Insert a bed support rubber into a table and fix it by

hammering a nail.

2. Pedal switch and connecting rod

1) Join two head hinges completely with the rear hole of

the sewing machine bed.

2) Assemble the head hinge into the fixed holder to the

head hinge rubber of table and put down the body of

sewing machine on the bed support rubber.

Please insert completely the support rod of the body

into the table, if not, there is concern about the safety

accident due to shaking of the rod when bending the

body of sewing machine backwards.

3. Oil Pan

1) Fix the twice inclined side of oil pan to the

undersurface of table with six nails making the inclined

side toward the worker.

[ Figure 6 ]

[ Figure 7 ]

[ Figure 8 ]

























4. Control box

1) As in the Figure, attach control box  to the lower part

of table with four bolts .

5. Pedal switch and connecting rod

1) Attach pedal switch  to pedal switch bracket  with

four bolts .

2) As in the Figure, attach pedal switch bracket  to the

lower part of table.

3) Connect one end of the connecting rod  with pedal

switch and the other end with pedal, and then adjust

length of the rod.

6. Program Unit

1) As in the Figure, combine program unit  to bracket 

with three screws .

2) Attach the combined bracket to the table with four

screw.

[ Figure 10 ]







[ Figure 9 ]





[ Figure 11 ]











7. Spool stand assembly

1) Fix a spool stand assembly to the table as shown in

figure.

- KM-1957-7 : Duel thread stand assembly

- KM-1967-7 : Three thread stand assembly

8. Installation of pneumatic components and function check

1) Fix the pneumatic bracket to the underneath of the

table with wood screw as shown in figure, and fix the

regulator to the T-leg of the table with the bolt,

washer, nut.

2) Connect the pneumatic tube by following the label marks

as shown in figure, then tie the tube and other leads with

belt clip.

3) Please set the basic air pressure to 0.5Mpa by using a

regulator.

4) Pneumatic hose label explanation.

9. Knee lifting pad

1) Assemble a knee lifting support shaft with a knee

lifting bar support as shown in figure.

2) Assemble a sensor presser plate and a knee support

connecting crank as shown in figure.

3) Fix the knee support connecting crank and the sensor

presser plate to the knee lifting support shaft with

fixation screws, .

4) Assemble a knee lifting pad with the knee support

connecting crank and fix its location according to the

users.



[ Figure 12 ]









[ Figure 13 ]







󰟅

[ Figure 14 ]

Function

Main Thread Tension Control Assembly Operation

Sub Thread Tension Control Assembly Operation

Back Tack Cylinder Operation

Label mark

















Note) For detailed pneumatic wiring information, please

refer to page 41.

10. Installing of thread release sensor

1) Fix a limit switch bracket to a bed support with a

fixation screw.

2) Adjust the location of the limit switch bracket and the

sensor presser plate by loosening the fixation screw

for bracket and the fixation screw for sensor presser

plate to make the sensor presser platepressed well the

detected part of the limit switch when operating the

knee lifting pad then fix screws, .

3) Please confirm the opening of a thread tension disk when

operating the knee lifting pad after pneumatic connection.

Note) Please readjust the limit switch and sensor plate

(Assembly) locations and the pneumatic hose

connection if the disk is not opened.

11. Installation of auto knee lifting solenoid (Option) and

power switch box

1) A control box should be attached at the center of a

solenoid bracket by checking the figure 16.

2) Attach the solenoid to the table according to the figure

in the solenoid box, adjust the location of link bowl by

loosening the fixation screw to make the center of

solenoid shaft and the underneath of table horizontally,

then fix the screw tightly after adjusting.

3) The solenoid sound, the load, the lifting amount of

presser foot can change depending on the adhesion state

of the knee lifting solenoid. Please assemble for smooth

operation.

Note) Do not use a thread open sensor when using auto knee

lifter.

[ Figure 16 ]

[ Figure 15 ]





























4-6. Supplying oil

Operate the machine only after supplying oil when the machine is used for the first time or has been left unused for a long time.

Only use genuine lubricant of this company. (Lubricant is in the accessory box.)

Notice

Plug in only after oil supply is finished. If the operator mistakenly steps on the pedal with the plug in,

the machine will start automatically and can cause severe injuries.

When handling lubricants, wear protective glasses or gloves to prevent lubricants from contacting with

your eyes or skin. Wash your hands in running water with soap when they are smeared with

lubricant. If lubricant is in the eye, instantly wash it with running water and see a doctor.

Never drink lubricants since they can cause vomiting or diarrhoea. Go to see a doctor, if you

mistakenly drink lubricant.

Keep the oil out of the reach of children. Keep the oil away from heat.

1. Supply oil at the oil hole of each friction part and red-marked hole before operating the sewing machine as shown in figure 17.

[ Figure 17 ]

4-7. Trial run (Pedal operation)

1. Press pedal lightly to the position of B to check if the

machine is operating low-speed sewing.

2. Press pedal to the position of C to check if the machine is

operating high-speed sewing.

3. Press pedal backward and forward. And then put the pedal at

neutral position of A to check if needle stops lower than the

upper surface of needle plate.(in case that needle down stop

is set)

4. When pressing pedal to the position of D(or pressing pedal

the position of to D and then replacing pedal to the position

of A), needle will stop higher than the upper surface of

needle plate after trimming.

4-8. Function of up/down stop button of needle bar (Auto

thread trimming type)

1) You can move the needle bar up and down by pressing a

Up/Down Stop Button of Needle Bar when the

machine stops. If you press the button, the needle at the

bottom would move up. If you press the button two times

consecutively, the needle bar at the above would move

down.

2) Check the stop position of sewing machine

Check the stop position of the machine after operating a

needle up/down by pressing the button. There can be

something wrong with the thread trimming function

when the stop position is incorrect. Then adjust the

position of upper stop sensor bracket assembled inside

the motor cover.

3) Remove the pulley and the motor cover, loosen the

fixation screw of upper stop sensor bracket. Adjust the

upper stop sensor bracket to the arrow direction then

take the stop position of needle bar.

Notice

Make sure not to touch or press down parts that are operating or moving during operation. Failure to follow

the safety rules may result in physical injuries or mechanical damages.

[ Figure 18 ]

[ Figure 19 ]



















4-9. Reverse Button Function Check

The machine changes immediately to backward stitching

when pressing a reverse button during forward stitching. If

you press a pedal and operate the sewing machine under the

state of holding the machine and pressing the reverse button

 in advance, stitches are made backward from the

beginning.

If you press the reverse button when the sewing machine is at

a standstill, you can change the up/down position of needle

bar. The needle bar locates at the upper stop when touching

one time lightly. If you touch the reverse button two times

consecutively within a second, the needle bar moves to the

lower stop position.

Therefore, it shares the reverse stitching function and the

up/down position of needle change function.

4-10. Functional Description of Function Switch

1) : Speed conversion switch

The speed decreases to the predetermined speed if you

press the switch while stitching and the speed changes as

original if you press the switch one more time.

2) : Sub Thread Tension Control Switch

The initial state of this switch releases the thread tension.

When pressing the switch, the disk is closed and the

thread tension increases.

[ Figure 20 ]



[ Figure 21 ]

4-11. Adjusting Parameter of Sub Thread Adjusting Device

- The default value of A-95 is “0”.

Parameter No. Set Value

Function Name

A-95 0

Use the main thread adjusting device. In order to run the sub thread adjusting device while

using the main device, press the sub thread tension switch. Then with the lamp turned on, the dish

for the sub thread adjusting device is closed.

After trimming, the sub thread tension switch is automatically turned off.

In the case where A-95’s parameter is set at “1”, the lamp of the sub thread tension switch is on,

and the sub thread adjusting device  is running like the main thread adjusting device.

In this case, even after trimming, the sub thread tension switch is not automatically turned off.

In order to release the tension of the sub thread adjusting device, press the sub thread tension

switch to turn it off.

4-12. How to Use Dual Tension

1. Main Thread Adjusting Device

- Adjust tension of the main thread adjusting device in line with the main sewing material conditions.

- Adjust the main thread adjusting device and the tension of the lower thread in order to create loops at the center of the

sewing material at even stitch length.

2. Sub Thread Adjusting Device

- Sub thread tension control assembly is a device that users increase easily the upper thread tension depending on the materials

or the change of stepped pulley while stitching.

- The sub thread adjusting device should be adjusted in line with the tension of the main thread adjusting device and the

conditions of sewing materials with height difference.

3. Operating MainSub Thread Adjusting Devices

- The mainsub thread adjusting devices,  are run by pneumatic pressure. In particular, the sub thread adjusting device

can be turned on and off easily with functional switches.

- If you press sub thread tension control button while stitching the lamp is turned on and the upper thread tension increases at the

same time. If you press the button again, the lamp is turned off and the upper thread tension decreases at the same time.

[ Figure 22 ]

 









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SunStar KM-1957-7 User manual

Brand: SunStar

Model: KM-1957-7

Category: Sewing machines

Type: User manual

This manual is also suitable for

KM-1967-7

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SunStar KM-1957-7 User manual

This manual is also suitable for

SunStar KM-1957-7 User manual

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