JUKI LBH-1790 Instruction Manual
  1. Manuals
  2. Brands
  3. JUKI Manuals
  4. Sewing Machine
  5. LBH-1790 Series
  6. Instruction manual

JUKI LBH-1790 Instruction Manual

Computer-controlled, high-speed, lockstitch buttonholing machine
Hide thumbs Also See for LBH-1790:
Table of Contents

Advertisement

Quick Links

See also: Handbook , Instruction Manual
Computer-controlled, High-speed,
Lockstitch Buttonholing Machine
LBH-1790

INSTRUCTION MANUAL

NOTE :
Read safety instructions carefully and understand them before using.
Retain this Instruction Manual for future reference.
R
E-No.01
40012734

Advertisement

Table of Contents
loading

Related Manuals for JUKI LBH-1790

Summary of Contents for JUKI LBH-1790

  • Page 1: Instruction Manual

    Computer-controlled, High-speed, Lockstitch Buttonholing Machine LBH-1790 INSTRUCTION MANUAL NOTE : Read safety instructions carefully and understand them before using. Retain this Instruction Manual for future reference. E-No.01 40012734...
  • Page 2 FAX : (81)3-3430-4909 • 4914 • 4984 The description covered in this instruction manual is subject to change for improvement of the TELEX : J22967 commodity without notice. Copyright 2003-2004 JUKI CORPORATION. All rights reserved throughout the world. 04 · 03 Printed in Japan (E)

  • Page 3: Important Safety Instructions

    17. The machine is only allowed to be used for the purpose intended. Other used are not allowed. 18. Remodel or modify the machine in accordance with the safety rules/standards while taking all the effective safety measures. JUKI assumes no responsibility for damage caused by remodeling or modification of the machine.

  • Page 4: For Safe Operation

    FOR SAFE OPERATION 1. To prevent possible accidents due to electric shocks, neither open the cover of motor electrical box nor touch the component(s) inside the electrical box. 2. Make sure of the needle entry after changing the pattern. Should the pattern protrude from the work clamp check, needle interferes with the work clamp check resulting in the danger of occurrence of needle breakage or the like.

  • Page 5: Table Of Contents

    CONTENTS . IMPORTANT SAFETY INSTRUCTIONS ............... 1 . SPECIFICATIONS ......................1 1. Subclass ..............................1 2. Specifications ............................1 3. Standard sewing shape list ........................2 4. Configuration ............................3 . INSTALLATION ......................4 . PREPARATION BEFORE OPERATION ..............12 1.

  • Page 6: Important Safety Instructions

    When operating this sewing machine, turn the power switch ON after setting the sewing machine to the bed base properly. 2. SPECIFICATIONS 1. Subclass Computer-controlled, high-speed, lockstitch buttonholing machine, LBH-1790, has the subclass machines below. Subclass Major Buttonholing of cloth...

  • Page 7: Standard Sewing Shape List

    3. Standard sewing shape list (5) Radial straight bar- (6) Radial taper bar-tacking (1) Square type (2) Round type (3) Radial square type (4) Radial type tacking type type PANEL PANEL PANEL PANEL PANEL PANEL DISPLAY DISPLAY DISPLAY DISPLAY DISPLAY DISPLAY (9) Eyelet straight bar- (10) Eyelet taper bar-...

  • Page 8: Configuration

    4. Configuration LBH-1790 consists of the following components. Power ON/OFF switch Machine head (LBH-1790) Operation panel Control box (MC-601) Presser lifting pedal Starting pedal Thread stand device...

  • Page 9: Installation

    3. INSTALLATION WARNING : To prevent possible accidents caused by the fall of the sewing machine, perform the work by two persons or more when the machine is moved. (1) Set-up of the table 1) Securely install control box w and power switch e on table q. 2) Securely fix the respective power cables of power switch e.
  • Page 10 (2) Connecting the power source cord • Voltage specifications Power source specifications are indicated on the voltage indication seal. (3-phase type only) For other type machines, power source specifications are indicated on the voltage caution seal and the rating label. Voltage caution seal C o n n e c t t h e c o r d i n a c c o r d a n c e w i t h t h e specifications.
  • Page 11 (3) Changing the voltage of 100 / 200V WARNING : To prevent personal injuries caused by electric shock hazards or abrupt start of the sewing machine, carry out the work after turning OFF the power switch and a lapse of 5 minutes or more.
  • Page 12 (4) Installing the sewing machine main unit WARNING : To prevent possible accidents caused by the fall of the sewing machine, perform the work by two persons or more when the machine is moved. 1) Place hinge plates q and shaft bearings w-1 (rubber) and w-2 (metal) in two places on the head base and fix the hinge plates to the machine head with setscrews e in two places.
  • Page 13 (6) Connecting the safety switch connector 1) Connect safety switch connector q with connector w located on the machine head side. Cord clamp (7) Installing the hook oil shield plate Install hook oil shield plate q onto bed base e with setscrew w.
  • Page 14 (9) Connecting the cords Perform the connection of the cords as shown in the figure below. Sewing machine head CN14 CN16 SDC circuit board CN16 CN14 CN37 CN38 CN37 CN42 CN38 CN39 CN39 Operation panel CN41 CN41 CN44 CN34 CN34 MAIN circuit board Electric bobbin winding device (optional)
  • Page 15 (10) Managing the cord 1) Slowly tilting the sewing machine, check that the cords are not forcibly pulled. 2) Fix the cords with cord setting plate q as shown in the figure. When you tilt the sewing machine, make sure that the sewing machine head support bar w is placed on the table.
  • Page 16 (12) Fixing the temporary stop switch The temporary stop switch has been in the state as shown in figure A at the time of delivery. Loosen setscrew q and set the switch in the state as shown in figure B, and fix it with setscrew q together with setscrew w supplied with the machine.

  • Page 17: Preparation Before Operation

    4. PREPARATION BEFORE OPERATION 1. Lubrioation WARNING : To protect against possible personal injury due to abrupt start of the machine, be sure to start the following work after turning the power off and ascertaining that the motor is at rest. Detailed diagram of oil amount adjusting section Oil pipe Decrease...

  • Page 18: Threading The Needle-Thread

    3. Threading the needle-thread WARNING : To protect against possible personal injury due to abrupt start of the machine, be sure to start the following work after turning the power off and ascertaining that the motor is at rest. Cotton thread, spun thread Synthetic filament thread Pass the needle thread in the order q to !2 as shown in the figures.

  • Page 19: Adjusting The Bobbin Thread Tension

    5. Adjusting the bobbin thread tension Adjust the bobbin thread tension as given below when the bobbin thread is pulled up at the position where thread slit q of bobbin case comes up. To such an extent that bobbin case quietly comes down when holding Purl stitch 0.05 to 0.15N thread end coming from bobbin case and shaking it quietly up and...

  • Page 20: Installing The Knife

    7. Installing the knife WARNING : To protect against possible personal injury due to abrupt start of the machine, be sure to start the following work after turning the power off and ascertaining that the motor is at rest. When replacing the knife with a new one, perform as follows.

  • Page 21: Operation Of The Sewing Machine

    5. OPERATION OF THE SEWING MACHINE 1. Explanation of the operation panel switch There are 3 states below according to back-light colors. Blue : Input mode ..Data change is possible. Green : Sewing mode ..Sewing possible state Yellow : Error state ..Some error occurs.
  • Page 22 FUNCTION NAME FUNCTION NAME This key selects overedging width LCD display Various data such as pattern No., OVEREDGING display. shape, etc. are displayed. WIDTH key READY key Press this key when starting sewing. BAR-TACKING This key selects left side of bar-tacking width compensation display.

  • Page 23: Basic Operation Of The Sewing Machine

    2. Basic operation of the sewing machine 1) Turn ON the power switch. First, check that presser type A which has been set is the same as that of the presser actually mounted. For checking and setting procedures, refer to 4. Inputting the presser type. 2) Select the pattern No.
  • Page 24 (2) Explanation of pedal motion 2-pedal type 1-pedal 1-pedal (Without intermediate position) (With intermediate position) Initial position Initial position Initial position Presser : Intermediate position w Presser : Maximum position q Presser : Maximum position q or Sewing position e 1) Setting of sewing product 1) Setting of sewing product 1) Setting of sewing product...

  • Page 25: Input Of The Presser Type

    4. Input of the presser type (1) Setting procedure of the presser type 1) Call the presser type setting parameter. Press PRESSER SELECTION key @4 memory switch (level 1) edit screen A is displayed. 2) Select the presser type. Press DATA CHANGE key !1 , and the picture is changed as shown in the illustration below.

  • Page 26: Performing Pattern Selection

    5. Performing pattern selection (1) Selection from the pattern selection screen 1) Set the mode to the input mode. When the back-light of LCD display q shows the input mode in blue color, it is possible to change the pattern. When the back-light shows the sewing mode in green color, press READY key w change over to the input mode.

  • Page 27: Changing Needle Thread Tension

    6. Changing needle thread tension Needle thread tension can be changed while performing trial sewing since the data related to the needle thread tension can be set by the sewing mode as well. 1) Call thread tension at parallel section setting data.

  • Page 28: Performing Re-Sewing

    7. Performing re-sewing When stop switch A is pressed during sewing operation, the sewing machine interrupts sewing and stops. At this time, error display screen B is displayed to inform that the stop switch is pressed. To continue performing sewing from some point in sewing Error No.

  • Page 29: Winding Bobbin Thread

    8. Winding bobbin thread (1) Winding the bobbin 1) Set the bobbin . Fit a bobbin fully onto the bobbin winder shaft. Take the thread from the spool and pass it through the guides in the numerical order as shown in the figure, and wind the end of the thread several times around the bobbin.

  • Page 30: Using The Counter

    9. Using the counter (1) Setting procedure of the counter value 1) Call counter setting screen. Press COUNTER key o under the input mode, and counter screen A is displayed. Then setting is possible. Setting of the counter value can be performed only with the input mode (back-light of LCD display q is blue).

  • Page 31: Using The Initial Value Pattern

    10. Using the initial value pattern This sewing machine has the initial value to perform the optimum sewing for the sewing shapes (30 shapes). / Refer to -. INITIAL VALUE DATA FOR EACH SHAPE TABLE. When creating sewing data newly, it is convenient to create it by copying the initial value pattern. 1) Set the mode to the input mode.

  • Page 32: Changing Sewing Data

    11. Changing sewing data (1) Initial sewing data at the time of your purchase Patterns from 1 to 10 have been already registered at the time of your purchase. Initial values of the square type, the cloth cutting length of which only is different from each other, have been inputted in the sewing data.

  • Page 33: Method Of Setting Sewing Data With/Without Edit

    12. Method of setting sewing data with/without edit This sewing machine has been set so as not to be capable of editing sewing data items which are less frequently used at the time of your purchase. When you desire to set the data more closely in accordance with the sewing products, set the sewing data item to the edit possible state and use the machine.

  • Page 34: Sewing Data List

    13. Sewing data list Sewing data are those that can be inputted to 99 patterns from pattern 1 to 99 and can be inputted to each pattern. The sewing machine has been set in the state that the data which is necessary to set “With/without edit”...
  • Page 35 Item Setting range Edit unit Remarks Compensation of bar-tacking width, right -1.00 to 1.00 0.05mm – This item adjusts right side outer shape of bar-tacking section in terms of overedging section. Top of Bottom of Bottom of square square type straight bar- type tacking...
  • Page 36 Item Setting range Edit unit Remarks 1st clearance 0.0 to 4.0 0.1mm – This item sets the clearance between 1st bar-tacking and knife groove. This item is applied to all shapes. 2nd clearance 0.0 to 4.0 0.1mm – This item sets the clearance between 2nd bar-tacking and knife groove.This item is applied to all shapes.
  • Page 37 Item Setting range Edit unit Remarks Compensation of right side position of -2.0 to 2.0 0.1mm *2, *3 basting This item sets the amount to move the sewing reference position of basting from the center of right overedging to the right or left. Speed setting of basting 400 to 4200 100rpm...
  • Page 38 Item Setting range Edit unit Remarks ACT timing adjustment at the start of 1st bar- -5 to 5 1 stitch tacking This item adjusts needle thread tension output start timing at 1st bar-tacking section. ACT timing adjustment at the start of right -5 to 5 1 stitch overedging...
  • Page 39 Item Setting range Edit unit Remarks Knife motion – – – This item sets "With/without motion" of normal cloth cutting knife. : N o r m a l k n i f e : N o r m a l k n i f e motion OFF motion ON Knife motion at 1st cycle of double stitching...

  • Page 40: Copying Sewing Pattern

    14. Copying sewing pattern Data of pattern No. which has been already registered can be copied to pattern No. which has not been used. Overwriting copy of the pattern is prohibited. When you desire to overwrite, perform it after erasing the pattern once.

  • Page 41: Using Pattern Register Key

    15. Using pattern register key Register pattern Nos. which are frequently used with the pattern register key and use them. Patterns which have been registered can be selected by pressing only the pattern register key under the input mode. (1) Method of register 1) Set the mode to the input mode.

  • Page 42: Using Parameter Register Key

    16. Using parameter register key Register parameters which are frequently used with parameter register key and use them. Parameters which have been registered can be selected by pressing only the parameter register key under the input mode. In addition, this key can use the same method as that of 15. Using pattern register key since this key can register not only the parameters but also pattern Nos.

  • Page 43: Performing Continuous Stitching

    17. Performing continuous stitching This sewing machine can perform continuous stitching which is capable of continuously sewing plural sewing pattern data without lifting the presser foot. It is possible to automatically sew up to maximum 6 shapes in one cycle. In addition, registration of as many as 20 data can be performed.
  • Page 44 (2) Method of editing continuous stitching data 1) Set the mode to the input mode. When the back-light of LCD display q shows the input mode in blue color, it is possible to select continuous stitching data. When the back-light shows the sewing mode in green color, press READY key w to change over to the input...

  • Page 45: Performing Cycle Stitching

    18. Performing cycle stitching This sewing machine can perform sewing of plural sewing pattern data in one cycle in the order of the data. Use this stitching when sewing plural different button holes on the sewing product since as many as 15 different kinds of patterns can be inputted.
  • Page 46 (2) Method of editing cycle data 1) Set the mode to input mode. When the back-light of LCD display q shows the input mode in blue color, it is possible to input the cycle data. When the back-light is the sewing mode in green color, press READY key w to change over to the input mode.

  • Page 47: Explanation Of Plural Motions Of Knife

    19. Explanation of plural motions of knife This sewing machine can automatically actuate the knife plural times and sew a buttonhole larger than the size of knife by setting the size of knife attached from the operation panel. Set and use this function when sewing various sewing shapes without replacing the knife.

  • Page 48: Method Of Changing Memory Switch Data

    20. Method of changing memory switch data 1) Set the mode to input mode. When the back-light of LCD display q shows the input mode in blue color, it is possible to change the memory switch data. When the back-light shows level 1 the sewing mode in green color, press READY key to change over to the input mode.

  • Page 49: Memory Switch Data List

    21. Memory switch data list (1) Level 1 Memory switch data (level 1) are the motion data that the sewing machine has in common and the data that operate on all sewing patterns in common. Item Setting range Edit unit Initial value Presser lifter maximum position 0 to 17.0...
  • Page 50 Item Setting range Edit unit Initial value Cloth cutting knife size 3.0 to 32.0 0.1mm 32.0mm Input knife size used. Function of plural motions of cloth cutting knife – – Ineffective Ineffective/effective Ineffective Effective Function of thread breakage detection – –...
  • Page 51 (2) Level 2 Press MODE switch for as long as three seconds and it is possible to edit. Item Setting range Edit unit Initial value Pedal selection – – 2-pedal Pedal type is set. / 3. How to use the pedal 2-pedal 1-pedal 1-pedal...
  • Page 52 Item Setting range Edit unit Initial value Knife solenoid lifting time setting 5 to 100 Knife cylinder lowering time (Optional) 5 to 300 Y-feed motor origin compensation -120 to 400 1 pulse (0.025mm) Needle-rocking motor origin compensation -10 to 10 1 pulse (0.05mm) Presser lifter motor origin compensation...

  • Page 53: Maintenance

    6. MAINTENANCE Adjusting the needle-to-hook relation WARNING : To protect against possible personal injury due to abrupt start of the machine, be sure to start the following work after turning the power off and ascertaining that the motor is at rest. Adjust the needle-to-hook relation when the needle enters the center of the needle hole in the throat plate.

  • Page 54: Adjusting The Needle Thread Trimmer

    2. Adjusting the needle thread trimmer WARNING : To protect against possible personal injury due to abrupt start of the machine, be sure to start the following work after turning the power off and ascertaining that the motor is at rest. (1) Adjusting the thread grasping force of the needle thread trimmer If the needle thread trimmer fails to provide consistent...

  • Page 55: Adjusting The Presser Bar Pressure

    3. Adjusting the presser bar pressure WARNING : To protect against possible personal injury due to abrupt start of the machine, be sure to start the following work after turning the power off and ascertaining that the motor is at rest. To adjust the pressure applied by the presser bar to fabric, turn presser spring regulator q.

  • Page 56: Thread Tension

    5. Thread tension (1) Thread take-up spring (purl stitch) 1) The thread take-up amount of thread take-up spring q is 8 to 10 mm, and the appropriate pressure at the start is approximately 0.06 to 0.1N. 2) To change the stroke of the thread take-up spring, loosen screw w, insert a thin screwdriver into the slot of thread tension post e, and turn it.

  • Page 57: Cleaning The Filter

    6. Cleaning the filter WARNING : To protect against possible personal injury due to abrupt start of the machine, be sure to start the following work after turning the power off and ascertaining that the motor is at rest. Clean filter w of the fan located on the bottom surface of the machine table (bed base) once every week.

  • Page 58: Gauge Components

    7. GAUGE COMPONENTS 1. Cloth cutting knife 12.7 1/2 L A Knife size (inch) B Knife size (mm) C Mark D Part No. B2702047F00 B2702047K00A 7/16 11.1 B2702047I00 12.7 B2702047L00A 9/16 14.3 B2702047V00 15.9 B2702047M00A 11/16 17.5 B2702047A00 19.1 B2702047N00 22.2 B2702047P00 25.4...

  • Page 59: Error Code List

    8. ERROR CODE LIST Error code Description How to recover Place of recovery Contact of initialization of EEP-ROM of MAIN CONTROL p.c.b. E001 Turn OFF the power. When data is not written in EEP-ROM or data is broken, initialization of the data is automatically informed.
  • Page 60 Error code Description How to recover Place of recovery Presser size over of basting E492 Possible to re-enter after Sewing data edit screen When stitching data of basting exceeds presser size. pressing reset key. [S40] Basting needle entry compensation Presser size over of tie stitching at sewing end E493 Possible to re-enter after Sewing data edit screen...
  • Page 61 Error code Description How to recover Place of recovery Abnormality of solenoid power E904 Turn OFF the power. When solenoid power of servo control p.c.b. fluctuates ±15% or more. Abnormality of temperature of heat sink for servo control p.c.b. E905 Turn OFF the power When temperature of heat sink of servo control p.c.b.

  • Page 62: Troubles And Corrective Measures

    9. TROUBLES AND CORRECTIVE MEASURES Troubles Causes Corrective measures Page 1. Needle thread breakage 1. Thread tension at parallel section is too high. Decrease the thread tension at parallel P.22 section. 2. Pressure or stroke of thread take-up spring is Decrease the tension of thread take-up P.51 too large.
  • Page 63 Troubles Causes Corrective measures Page 11. K n i f e d r o p s e v e n 1. Check whether the thread breakage detector Adjust the detector plate. – when needle thread is plate is properly adjusted. (Refer to the Engineer's Manual.) cut.

  • Page 64: Drawing Of The Table

    0. DRAWING OF THE TABLE...

  • Page 65: Initial Value Data For Each Shape Table

    Contents...

Table of Contents