typical GT1790A User manual

GT1790A
COMPUTER-CONTROLLED HIGH SPEED LOCKSTITCH
BUTTONHOLING MACHINE
INSTRUCTION BOOK

Contents
I. Important Safety Instructions............................................................................................................................... 1
II. Specifications........................................................................................................................................................1
1. Specifications.............................................................................................................................................1
2. List of standard sewing shapes..................................................................................................................2
3. Structure.....................................................................................................................................................3
III. Installation............................................................................................................................................................ 5
IV. Operation Preparation.........................................................................................................................................15
1. Lubrication...............................................................................................................................................15
2. Attaching the needle................................................................................................................................ 15
3. Threading the needle thread.................................................................................................................... 16
4. Threading the bobbin case.......................................................................................................................16
5. Adjusting bobbin thread tension..............................................................................................................17
6. Installing bobbin case.............................................................................................................................. 17
7. Installing the knife...................................................................................................................................19
8. Checking the delivery state..................................................................................................................... 19
V. Operation of the Sewing Machine......................................................................................................................20
1. Description operation panel switch......................................................................................................... 20
2. Basic operation of the sewing machine...................................................................................................22
3. Pedal operation method........................................................................................................................... 23
4. Inputting the presser type........................................................................................................................ 25
5. Selecting pattern...................................................................................................................................... 26
6. Change needle thread tension..................................................................................................................27
7. Performing re-sewing.............................................................................................................................. 29
8. Winding bobbin thread............................................................................................................................ 31
9. Using the counter.....................................................................................................................................33
10. Using the initial value management........................................................................................................ 35
11. Changing sewing data..............................................................................................................................37
12. Method of setting sewing data with/without edit....................................................................................38
13. Sewing data list........................................................................................................................................39
14. Copying sewing data............................................................................................................................... 45
15. Edit/check the data other than sewing data............................................................................................. 46
16. Using parameter register key...................................................................................................................48
17. Performing continuous sewing................................................................................................................49
18. Performing cycle sewing......................................................................................................................... 52
19. Change the name of cycle sewing/continuous sewing data.................................................................... 55
20. Description of plural motions of knife.................................................................................................... 56
21. Changing method of memory switch data...............................................................................................57
22. List of memory switch data..................................................................................................................... 58
23. Adjusting pedal depression value............................................................................................................62
24. Adjusting the contrast..............................................................................................................................63
25. Setting the key lock................................................................................................................................. 63
26. Communication....................................................................................................................................... 64
VI. Maintenance........................................................................................................................................................66

1. Adjusting the needle-to-hook relation.....................................................................................................66
2. Adjusting the needle thread trimmer.......................................................................................................68
3. Adjusting the presser bar pressure...........................................................................................................69
4. Adjusting the bobbin presser unit............................................................................................................69
5. Thread tension......................................................................................................................................... 70
6. Replacing the fuse................................................................................................................................... 71
VII. Standard Parts.....................................................................................................................................................72
1. Cloth cutting knife...................................................................................................................................72
2. Throat plate..............................................................................................................................................72
3. Presser......................................................................................................................................................72
IX. Trouble and Corrective Measures...................................................................................................................... 79
X. Table of Initial Value Data for Each Shape........................................................................................................ 81

-1-
I. Important Safety Instructions
1) Never operate the sewing machine before adding lubricant into the oiling tank.
2) When operation is completed, please remove dust from the hook bobbin thread cutting knife and check
whether the lubricant is sufficient.
3) Be sure to return the activating pedal to the home position after the machine has started to run.
4) A detector is installed so that this sewing machine cannot be operated in the state that the machine head is
tilted. When operating the sewing machine, please turn on the power after correctly set the machine head on
the table.
II. Specifications
Main specifications for CSM-1790A Computer-controlled High-speed Lockstitch Buttonholing Machine
Subclass
Major
application
Buttonholes on button cloth such as shirts, blouses,
working uniforms, suit-dress.
Buttonhole size
1. Specifications
Sewing speed
Standard speed: 3600sti/min (Max.: 4200sti/min) (In case of dry-type hook, max.:
3300sti/min)
Needle
DPX5 # 11J 〜# 14J
Hook
Full rotating hook, type DP
Needle rocking drive method
Driving pulse motor
Needle feeding drive method
Driving pulse motor
Presser lifting drive method
Driving pulse motor
Lift of presser foot
14mm (set as required) Max.: 17mm (in case of backstitch)
Cloth cutting knife drive method
Driving pulse motor
Number of standard sewing shapes
31 types
Number of memorized patterns
99
Power supply
Single phase 200/220/230/240V, 370VA
Standard: Max. 5mm
Parts with special
specifications: Max. 10mm
Dimension of knife
6.4~31.8mm (1/4’~1-1/4’)
Buttonholing sewing length
Standard: Max. 41mm
Parts with special
specifications: Max. 120mm

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2. List of standard sewing shapes

-3-
3. Structure

-4-
CSM-1790A is composed of the following components
❶
Power switch
❷
Sewing machine head (CSM-1790A)
❸
Operation panel
❹
Electrical box
❺
Pressor lifting pedal
❻
Thread stand device

-5-
III. Installation
(1) Table Assembly
1) Fix control box⑽and power switch⑿on the table.
2) Fix the power switch⑿with fixing strip.
3) Pass four bed base fixed screws (4) through bed base.
4) Install rubber cushions ⒃to holes⒄(4) for fixing bed base and the fixe the bed base⒂.
5) Fix machine head support bar⑾on the table⑾.
6) Connect the pedal and pedal sensor⒀with accessory connecting rod⒆after placing the sewing machine
main body on the bed base⒂.

-6-
(2) Connecting the power cord
Voltage specification
Power source specifications are indicated on the
voltage indication tag and the rating label.
Please choose cables according to the specification.
Voltage indication tag
Rating label
Please do not run the machine under different voltage specifications.
Connection for single phase 200V, 220V, 230V and 240V
Light blue
Light blue
Table
Control
box
Green/Yellow
Brown
Brown
Power switch
Green/Yellow
Connector
Power cord
Brown
Light
blue
Green/
Yellow

-7-
(3) Installation of the sewing machine main unit
(4) Tilting method of sewing machine
Caution
When handling the sewing
machine, be sure to perform the
work with two persons or more.
Install hinges❶and bearing blocks❷(❷-1: rubber, ❷-2:
metal) on machine head position 2, and fix hinge plates on the
sewing machine head with setscrews❸in two positions.
Please do not install the rubber hinge and metal hinge
in reverse sequence. Otherwise, danger may be caused
when the sewing machine is tilted.
❷-1(Rubber)
(Metal)
Danger
Perform the work so as not to allow your fingers to be caught in the machine when tilting or raising it.
In addition, to avoid possible accidents caused by abrupt start of the machine, turn OFF the power to
the machine before starting the work.
When tilting the sewing machine head, tilt quietly the
sewing machine until head support bar❶comes in contact
with it.
1. Before tilting the sewing machine, please
confirm whether a support bar❶has been
installed on the table.
2. In order to prevent sudden fall of the sewing
machine, please place it horizontally and then
tilt it.

-8-
(5) Connection of machine head tilting detector
1) Connect the safety switch connector❶to the
connector❷on the machine head side.
(6) Installation of the hook oil-proof plate
(7) Installation of operation panel
Please fix the operation panel❶with 4 wood
screws❷and then pass the cable through the
table hole.

-9-
(8) Connection of the cable
1) As shown in the figure, pass 4 cables, which are on
the right part of cables connected to the MAIN
printed circuit board, through cable clamp A and
insert them to corresponding connectors (CN38, 39,
41, 42). Insert the cable connected to CN37 directly
to the connector without passing through cable
clamp A. In addition, when using electric bobbin
winding device (optional), please pass the cable
through the cable holder and then connect it to
CN44.
2) Directly insert the cable connected to the operation
panel on the left of MAIN printed circuit board to
CN34.
3) Directly insert cables connected to SDC printed
circuit board to CN14 and CN16.
4) Secure the ground wire with the setscrew ❶.
SDC printed circuit
board
Sewing machine
head
MAIN printed
circuit board
Operation panel
Electric bobbin winding device
(optional)
SDC printed circuit board
Cable clamp A

-10 -
(9) Handling of the cord
1) Please tilt the sewing machine slowly while confirm that no cable is forcibly pulled.
2) As shown in the figure, secure cables with cable fixing plate❶.
When tilting the sewing machine, please make sure that the machine head support bar❷has been installed
on the table.

-11 -
(10) Installation of the eye protective cover
Warning
Be sure to attach this cover to protect the eyes from the disperse of needle
breakage.
Please make sure the eye protective cover❶has been installed before operating the sewing machine.
When placed longitudinally
When placed horizontally
(11) Fixation of STOP switch
At the time of delivery, the STOP switch is in state A. Please loosen the setscrew❶to change it into state B, and
then fix it with accessory setscrew❷and the setscrew❷.
Operator
Operator

-12 -

-13 -
(12) Guide rod
Securely fit the thread guide rod so that two side
holes in the thread guide rod face the thread guide.
(13) Installation of thread stand
1) Assemble the thread stand into the holes
on the top right of the table.
2) Tighten the setscrew❶to fix the thread
stand.
Guide rod

-14 -
(14) Installation of auxiliary table
1) Fix the auxiliary table mounting plate①(2)
with bolts③(4) on the auxiliary table
temporarily.
2) Fix the auxiliary table ②with bolts③(2)
on the sewing machine bed temporarily.
3) Fix the bolts③(4) to remove the clearance
between the sewing machine bed and the
auxiliary table.
4) Fix the bolts④(2) to align the auxiliary
table with the upper side of the sewing
machine bed.

-15 -
IV. Operation Preparation
1. Lubrication
! Warning
Please turn off the power switch and confirm that the motor has stopped before operation to
prevent personal injuries caused by unexpected start.
1) Lubricating oil to oiling tank
♦ Fill the oiling tank with New Defrix Oil No.1 up to the level indicated by MAX ①.
2) Adjust the lubrication for the sewing hook
♦ The amount of oil is adjusted with oil amount adjusting screw②.
♦ Amount of supplied oil is reduced when turning the screw②clockwise.
♦ For newly-installed sewing machine or sewing machine out of service for a long time, please remove
the bobbin case and drip 2-3 droplets of oil on the side slots of the cover. In addition, drip several
droplets of oil into the oiling hole in the metal parts③in front of the lower shaft, and make the oil
infiltrate into the felt inside the hole.
2. Attaching the needle
! Warning
Please turn off the power switch and confirm that the motor has stopped before operation to
prevent personal injuries caused by unexpected start.
Hold needle with its recessed part facing toward the operator side A.
Then deeply insert the needle into the needle bar hole and tighten the
needle setscrew①.
Use a DPX5-(#11J, #141) needle.
Turn off the power switch before attaching the needle.
Lubricant amount
adjustment diagram
Lubricant
supply tube
Less
Lubricant amount
More

-16 -
3. Threading the needle thread
! Warning
Please turn off the power switch and confirm that the motor has stopped before operation to
prevent personal injuries caused by unexpected start.
Thread as per the order as shown above.
The threading can be done easily by using the needle threader supplied with the machine.
For different thread, different methods shall be used for the thread guide.
4. Threading the bobbin case
Rotating direction of bobbin and threading
1) Insert the bobbin in the direction of arrow.
2) Pass the thread through thread slit①, then pass through the tension spring②from the bottom, and repass
through the thread slit③to pull the thread out from④.
3) Please note that when conducting purl stitching and whip stitching sewing, threading methods for④will be
different.
(Cotton thread,
spun thread)
(Synthetic
filament thread)
Bobbin
Bobbin case
Purl stitch
Whip stitch

-17 -
5. Adjusting bobbin thread tension
Adjust the bobbin thread tension as given below when the bobbin thread is pulled up at the position where thread
slit❶of bobbin case comes up.
Purl stitch
0.05 〜0.15N
Hold the thread end coming from the bobbin case with hand, shake it up and
down lightly and the bobbin case will drop slightly.
Whip stitch
0.15 〜0.3N
Hold the thread end coming from the bobbin case with hand, shake it up and
down a little more strongly and the bobbin case will drop.
When turning the thread tension screw❷clockwise, the bobbin thread tension will be increased, and turning it
counterclockwise, the bobbin thread tension will be decreased.
For synthetic thread, reduce the tension slightly. For cotton thread, please increase the tension slightly. Increase
the thread tension by around 0.05N after the hook has been installed because an anti-spin spring has been installed
in the machine.
Caution When bobbin thread tension is adjusted, check the needle thread tension setting of the memory
switch. (Refer to “V-22. List of memory switch data” p.52)
6. Installing bobbin case
! Warning
Please turn off the power switch and confirm that the motor has stopped before operation to
prevent personal injuries caused by unexpected start.
1) Raise the bobbin case latch lever.
2) Push the bobbin case into the hook so that it is
supported by the hook shaft❶and then snap the
latch lever. Press the bobbin case until the
predetermined position is reached, it will click.
1. If the bobbin case is not in the required
position, it can jump out from the hook
to cause the needle thread to tangle on
the hook shaft. Check to be sure that the
bobbin case is properly installed in the
correct position.
2. Because shapes of standard hook and
dry-type hook are different, any type of
hook cannot be replaced by the other.