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JUKI LBH-1790S Instruction Manual

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LBH-1790S
INSTRUCTION MANUAL

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  • Page 1 LBH-1790S INSTRUCTION MANUAL...

  • Page 2: Table Of Contents

    CONTENTS I. IMPORTANT SAFETY INSTRUCTIONS ............. 1 II. SPECIFICATIONS ..................1 1. Specifications .........................2 2. Standard sewing shape list ....................3 3. Configuration .........................4 III. INSTALLATION ..................5 IV. PREPARATION BEFORE OPERATION ..........15 1. Lubrication ...........................15 2. Inserting the needle ......................16 3.
  • Page 3 25. How to adjust the contrast ....................62 26. How to set the key lock .....................62 27. Communication ........................63 28. Production support function ....................66 VI. MAINTENANCE ..................72 1. Adjusting the needle-to-hook relation ................72 2. Adjusting the needle thread trimmer .................73 3.

  • Page 4: Important Safety Instructions

    When operating this sewing machine, turn the power switch ON after setting the sewing machine to the bed base properly. II. SPECIFICATIONS Main specifications of the LBH-1790S computer-controlled, lockstitch buttonholing machine Subclass Buttonholing of cloth such as men’s shirts, blouses, Major application work uniforms, ladies' wear, etc.

  • Page 5: Specifications

    1. Specifications Sewing speed Standard speed : 3,600 sti/min (Max. : 4,200 sti/min) (Max. : 3,300 sti/ min when dry hook is used) Needle DP×5 #11J to #14J Hook DP type full-rotary hook Needle rocking drive method Drive by stepping motor Feed drive method Drive by stepping motor Presser lifting drive method...

  • Page 6: Standard Sewing Shape List

    2. Standard sewing shape list (3) Radial square (5) Radial straight (6) Radial taper (7) Eyelet square (1) Square type (2) Round type (4) Radial type type bar-tacking type bar-tacking type type PANEL PANEL PANEL PANEL PANEL PANEL PANEL DISPLAY DISPLAY DISPLAY DISPLAY...

  • Page 7: Configuration

    3. Configuration ❻ ❷ ❸ ❶ ❹ ❺ ❼ The LBH-1790S sewing machine consists of the following parts. ❶ Power switch ❷ Machine head (LBH-1790S) ❸ Operation panel ❹ Control box (MC-603) ❺ Presser lifting and starting pedal ❻ Thread stand device ❼...

  • Page 8: Installation

    III. 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) Preparation for assembly of the control box 1) Fix toothed washers ❷ and rubber cushions ❸...
  • Page 9 (2) Set-up of the table 1) Fix control box  , power switch  and pedal sensor  on table  . 2) Fix power switch  with a staple. 3) Pass four bed base fixed screws  through bed base  . 4) Set rubber cushions  to holes  (4 places) for fixing bed base and fix bed base  .
  • Page 10 (3) Connecting the power source cord • Connecting the power cable Voltage specifications are shown on the power indication tag attached on the power cable and on the rating plate adhered on the power box. Connect the cable which matches the specifications. Power indication tag Rating plate (For example: In the...
  • Page 11 (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 ❶ and shaft bearings ❷ -1 (rubber) and ❷...
  • Page 12 (6) Connecting the machine head tilt detector Connect machine head tilt detector ❶ with connector ❷ located on the machine head ❷ side. ❶ (7) Installing the hook oil shield plate Install hook oil shield plate ❶ onto bed base ❸ with setscrew ❷...
  • Page 13 (9) Connecting the cords ❷ Sewing machine head Earth cord CN15 CN17 ❹ ❶ CN32 CN40 CN49 1) Loosen four setscrews ❷ of control box cov- er ❶ . Remove control box cover ❶ . 2) Connect the cord to the connector on the Operation panel CN39 MAIN PCB as illustrated in the figure below.
  • Page 14 (10) Managing the cord 1) Slowly tilting the sewing machine, check that the cords are not forcibly pulled. When you tilt the sewing ma- chine, make sure that the sewing machine head support bar ❶ is placed on the table. ❶...
  • Page 15 (11) Installing the eye protection cover WARNING : Be sure to attach this cover to protect the eyes from the disperse of needle breakage. Be sure to install and use eye protection cover ❶ and use the sewing machine. When placed longitudinally When placed horizontally ❶...
  • Page 16 (13) Thread guide rod Insert the thread guide pin into the insert hole se- curely so that two lateral holes in the thread guide Thread guide rod pin face the front of the tension controller No. 1 (A). Tension controller No. 1 (14) Installing the thread stand 1) Assemble the thread stand, and set it in the hole in the top right corner of...
  • Page 17 (15) Installing the auxiliary table 1) Temporarily fix two auxiliary table mount- ing plates ❶ on auxiliary table ❷ with four bolts ❸ . 2) Temporarily fix auxiliary table ❷ on the ❷ sewing machine bed with two bolts ❹ . 3) Fix four bolts ❸...

  • Page 18: Preparation Before Operation

    1) Lubricating oil to oiling tank ○ Fill the oiling tank with JUKI New Defrix Oil No.1 up to the level indicated by “MAX” ❶ . (Caution) When supplying oil to the oil tank through the lubricating hole, take care not to allow dust to enter the oil tank.

  • Page 19: Inserting The Needle

    3) How to check the hook oil quantity 1. In preparation for checking the hook oil quan- tity, cut a sheet of paper to make a piece of paper size of which is approximately 40 mm x 100 mm. 2. After the adjustment of the oil quantity, start the sewing machine at a high speed (3,600 40 mm sti/min) by 100 times or more.

  • Page 20: 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 fol- lowing work after turning the power off and ascertaining that the motor is at rest. ❶...

  • Page 21: Adjusting The Bobbin Thread Tension

    5. Adjusting the bobbin thread tension ❷ ❶ Adjust the bobbin thread tension as given below when the bobbin thread is pulled up at the position where thread slit ❶ 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 down.

  • Page 22: 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 fol- lowing work after turning the power off and ascertaining that the motor is at rest. When replacing the knife with a new one, perform as ❷...

  • Page 23: Operation Of The Sewing Machine

    V. OPERATION OF THE SEWING MACHINE 1. Explanation of the operation panel switch ❻ ❼ ❶ ❽ ❾ ❷ ❸ ❹ ❺ – 20 –...
  • Page 24 NAME FUNCTION NAME FUNCTION ❶ LCD display Various data such as pattern OVEREDGING This key selects overedging width No., shape, etc. are displayed. display. WIDTH key Every time this key is pressed, S005 and S006 are displayed alter- nately. ❷ READY key Press this key when starting PITCH key...

  • Page 25: Basic Operation Of The Sewing Machine

    2. Basic operation of the sewing machine 1) Turn ON the power switch. When you turn ON the power to the sewing machine for the first time after the purchase, the language selection screen A is displayed. Select the language to be displayed, then press return key ❾...

  • Page 26: How To Use The Pedal

    3. How to use the pedal For this sewing machine, the pedal operation method to be used can be selected from among the four dif- ferent ones as described on the next page. Select the operating procedure you desire for working efficien- cy and use the sewing machine.
  • Page 27 (2) Explanation of pedal motion 1-pedal 1-pedal 1-pedal 2-pedal type (Without intermediate (With intermediate (With a depress on the position) position) back part of the pedal) Initial position Initial position Initial position Initial position Presser : Intermediate Presser : Maximum Presser : Maximum po- Presser : Intermediate position ②...

  • Page 28: Input Of The Presser Type

    4. Input of the presser type (1) Setting procedure of the presser type ❼ 1) Call the presser type setting parameter. ❹ When MODE key is pressed, the memory switch (level 1) edit screen A is dis- played. 2) Select the presser type. ❼...

  • Page 29: Performing Pattern Selection

    5. Performing pattern selection (1) Selection from the pattern selection screen 1) Set the mode to the input mode. ❼ Under the input mode where SET READY LED  goes out, pattern selection is enabled. If the current mode is the sewing mode, press ❷...

  • Page 30: 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 31: 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 Sewing motion stop status Error display screen B is displayed.

  • Page 32: 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 33 If you start the bobbin winder ❶ ❼ Thread take-up eyelet independently (starting only the bobbin winder without performing sewing), remove the needle thread from ❼ to  as shown in the figure given below so as to carefully prevent the needle thread from ❻...

  • Page 34: Using The Counter

    9. Using the counter For this sewing machine, the progress rate and the operation rate of the sewing machine can be displayed by setting the No. of pcs. counter and the production parameter. Refer to "V-28. Production support function" p.66 for how to use the progress rate and the operation rate.
  • Page 35 (2) Completion of counting The count completion screen has been factory-set to "disabled" at the time of shipment. In order to use the count-completion screen for the sewing counter, set the memory switch U077 to "Enable display". (Refer to "V-21. Method of changing memory switch data" p.55.) [Bobbin thread counter] (1) How to set the No.
  • Page 36 (2) Type of the bobbin thread counter ① Sewing UP counter The current value displayed on the bobbin thread counter is increased by one every time the sewing machine sews 10 stitches. When the current value becomes equal to the set value, the count complete screen is displayed.

  • Page 37: 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 (31 shapes). → Refer to "XI. INITIAL VALUE DATA FOR EACH SHAPE TABLE" p.89. 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 38: 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 →...
  • Page 39 5) Changing the name of pattern data. Select "S500 Pattern data name" and press EDIT ❽ ❻ ❼ key ❽ to enable change of the pattern data name. When you press ITEM SELECT key ❻ , the edit point will move in sequence. The character placed between "+"...

  • Page 40: 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 41: 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 42 Item Setting range Edit unit Remarks S010 Compensation of bar-tacking width, right -1.00 to 1.00 0.05 mm – This item adjusts right side outer shape of bar-tack- ing section in terms of overedging section. It is corrected 1st and 2nd bar-tacking together. Top of Bottom Bottom of...
  • Page 43 Item Setting range Edit unit Remarks S021 Pitch at bar-tacking section 0.200 to 2.500 0.025 mm – This item sets sewing pitch of bar-tacking section. Top of Top of Top of square round semilunar type type type Bottom of Bottom of straight bar- taper bar- tacking...
  • Page 44 Item Setting range Edit unit Remarks S040 Crosswise compensation of needle entry 0.0 to 1.0 0.1 mm of basting This item sets the amount to move needle entry position to the right or left when performing basting more than two cycles. Compensation of left side position of bast- S041 -2.0 to 2.0...
  • Page 45 Item Setting range Edit unit Remarks S060 ACT timing adjustment at the start of right -5 to 5 1 stitch overedging This item adjusts needle thread tension output start timing at right overedging section. ACT timing adjustment at the start of 2nd S061 -5 to 5 1 stitch...
  • Page 46 Item Setting range Edit unit Remarks S084 Maximum sewing speed limitation 400 to 3600 100 sti/min – This item sets max. speed limitation of the sewing speed. The maximum value of data edit is equal to the sewing speed of K007 Maximum speed limita- tion of the memory switch data.

  • Page 47: 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 48: How To Edit/Check The Data Other Than Sewing Data

    15. How to edit/check the data other than sewing data The screen for editing/checking the various data is invoked by selecting the menu on the mode screen. 1) Set the mode to input mode. ❻ ❼ Under the input mode where set ready LED  goes out, the mode screen can be called.
  • Page 49 3) Selecting the menu. Items which can be registered on the key are displayed. Press ITEM SELECT key ❻ to select the target menu. When you press EDIT key ❽ during the menu selection, the following screens can be invoked. Memory switch 1 →...

  • Page 50: 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. (1) Method of register 1) Set the mode to the input mode.

  • Page 51: 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 52 (2) Method of editing continuous stitching data 1) Set the mode to the input mode. ❽ ❻ ❼ ❾ Under the input mode where SET READY LED  goes out, entry of the continuous-sewing data is enabled. If the current mode is the sewing mode, press READY key ❷...
  • Page 53 4) Change data of selected editing point. Press DATA CHANGE key ❼ , and data of editing point can be changed. When the editing point is at the pattern No. : Pattern No. which has been registered is displayed and it is possible to select. When the editing point is at the jump feed : It is possible to edit numerical value within the range of ±120 mm.

  • Page 54: 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. As many as 30 different patterns can be entered. Use this function to sew two or more different buttonholes on sewing products.
  • Page 55 (2) Method of editing cycle data 1) Set the mode to input mode. Under the input mode where SET READY LED  ❽ ❻ ❼ ❾ goes out, entry of the cycle data is enabled. If the current mode is the sewing mode, press READY key ❷...

  • Page 56: How To Change The Name Of Cycle/Continuous Sewing Data

    4) Change data of selected editing point. Press DATA CHANGE key ❼ and data of editing point can be changed. Pattern No. which has been registered is displayed and it is possible to select. In addition, press RESET key ❸ , and the pattern data of editing point can be deleted.

  • Page 57: Explanation Of Plural Motions Of Knife

    20. 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 58: Method Of Changing Memory Switch Data

    21. Method of changing memory switch data 1) Set the mode to input mode. Under the input mode where SET READY LED ❻ ❼  goes out, change to the memory switch data is enabled. If the current mode is the sewing mode, press READY key ❷...

  • Page 59: Memory Switch Data List

    22. 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 U001 Presser lifter maximum position...
  • Page 60 Item Setting range Edit unit Initial value Cloth cutting knife size U018 3.0 to 32.0 0.1 mm 32.0 mm Input knife size used. Function of plural motions of cloth cutting knife U019 – – Ineffective/effective Ineffective Effective U020 Function of thread breakage detection Ineffective/ –...
  • Page 61 (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 K001 Pedal selection – – Pedal type is set. → Refer to "V-3. How to use the pedal" p.23.
  • Page 62 Item Setting range Edit unit Initial value Pattern selection function under sewing mode K018 – – Ineffective/effective Ineffective Effective Thread trimming on the way in continuous stitching K019 – – Permitted/Prohibited Permitted Prohibited Release amount of bobbin thread trimmer at K021 0 to 15 1 pulse...

  • Page 63: How To Change The Sewing Speed While The Sewing Machine Is Engaged In Sewing

    23. How to change the sewing speed while the sewing machine is engaged in sewing It is possible to change the sewing speed under the sewing mode. 1) Putting the sewing machine in the ❻ ❼ sewing mode. When READY key ❷ is pressed in the state where the pattern data is selected, READY LED  lights up to enable sewing.

  • Page 64: How To Adjust The Pedal Variable Resistor

    24. How to adjust the pedal variable resistor The variable resistor of the pedal can be adjusted by depressing the pedal or inputting a pedal variable resistor value on the operation panel. ❽ ❻ ❼ 1) Calling the pedal variable resistor adjustment screen.

  • Page 65: How To Adjust The Contrast

    25. How to adjust the contrast The contrast of the display on the panel can be adjusted in five steps. ❽ ❼ 1) Calling the contrast adjustment screen. Select the contrast adjustment from the menu on the mode screen and press EDIT key ❽ Then, the contrast adjustment screen A is dis- played.

  • Page 66: Communication

    Vector form data VD00 ××× .VDT the PM-1. The data form is commonly used among JUKI sewing machine. * Refer to the Engineer's Manual for how to set the vector form data. 3) Selecting the communication direction. Press ITEM SELECT key ❻...
  • Page 67 4) Selecting the number. ❻ ❼ Press ITEM SELECT key ❻ to select file No. B to be read. Press DATA CHANGE key ❼ to select file No. C to be written. Press READY key ❷ to write the data in file No.
  • Page 68 • Some type of the USB device may not be properly recognized by this sewing machine. • JUKI does not compensate for loss of data stored on the USB device caused by using it with this sewing ma- chine. •...

  • Page 69: Production Support Function

    28. Production support function This function displays the number of pieces produced for the day, calculates the progress rate of sewing work based on that number of pieces, and displays the result. In addition, this function calculates the operation rate of the sewing machine based the operating hours of the sewing machine, and displays the result.
  • Page 70 (1) Date and time setting 1) Calling the date and time setting ❽ ❻ ❼ screen Select the date and time setting on the production parameter setting screen. In this state, press edit key ❽ The date and time setting screen is displayed 2) Setting the date and time When you press item select key ❻...
  • Page 71 (2) Setting the work hours Set the work hours that is required to calculate the progress rate and the operation rate for the production support function. 1) Calling the work hours setting screen ❽ ❻ ❼ In the state where the work hours setting is selected on the production parameter setting screen, press edit key ❽...
  • Page 72 (3) Setting the number of times of thread trimming for sewing one piece of product Set the number of times of thread trimming to be carried out until the production counter completes count- ing. 1) Calling the count complete unit setting ❽...
  • Page 73 (4) Setting the work break time Set the work break time that is excluded from the calculation of the progress rate for the production support function. As many as three work break times can be set. 1) Calling the work break time 1 setting ❻...
  • Page 74 (5) Calling the screen for setting the display type of the target number of pieces Set the display type of the target number of pieces to be used for the production support function. 1) Calling the screen for setting the ❼...

  • Page 75: Maintenance

    VI. MAINTENANCE 1. 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 fol- lowing work after turning the power off and ascertaining that the motor is at rest. Adjust the needle-to-hook relation when the needle ❶...

  • Page 76: 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 fol- lowing 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 consis-...

  • Page 77: 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 fol- lowing work after turning the power off and ascertaining that the motor is at rest. The presser bar pressure should be set on a pattern-by-pattern basis.

  • Page 78: Thread Tension

    5. Thread tension (1) Thread take-up spring (purl stitch) 1) The thread take-up amount of thread take-up ❶ spring ❶ is 8 to 10 mm, and the appropriate ❸ pressure at the start is approximately 0.06 to 0.1N. 2) To change the stroke of the thread take-up spring, loosen screw ❷...

  • Page 79: Replacing The Fuse

    6. Replacing the fuse WARNING : 1. To avoid electrical shock hazards, turn OFF the power and open the control box cover after about five minutes have passed. 2. Be sure to turn OFF the power switch and wait for five minutes or more before opening the con- trol box cover.

  • Page 80: Disposal Of Batteries

    7. Disposal of batteries The operation panel has a built-in battery in order to operate the clock even when the power is turned OFF. Be sure to dispose of the battery following the local laws and regulations. [How to remove the battery] Remove operation panel ❶...

  • Page 81: Gauge Components

    VII. GAUGE COMPONENTS 1. Cloth cutting knife 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 B2702047Q00A 1-1/4 31.8...

  • Page 82: Error Code List

    VIII. ERROR CODE LIST Error code Description How to recover Place of recovery E001 Contact of initialization of EEP-ROM of MAIN CON- Turn OFF the TROL p.c.b. power. When data is not written in EEP-ROM or data is broken, initialization of the data is automatically informed. E007 Main shaft motor-lock Turn OFF the...
  • Page 83 Error code Description How to recover Place of recovery E052 Thread breakage detection error Possible to re- Step screen When thread breakage has occurred during machine run- cover by reset. ning. Memory switch data error E061 Turn OFF the When memory switch data is broken or revision is old. power.
  • Page 84 Error code Description How to recover Place of recovery E485 Number of times of basting unsetting error Possible to re- (During individual sew- In the case the number of times of basting is not set (OFF) cover by reset. ing/cycle sewing) for "Basting+ Cloth cutting knife shape".
  • Page 85 Error code Description How to recover Place of recovery E494 Presser size over of tie stitching at sewing start Possible to re-en- (During individual When stitching data of tie stitching at sewing start exceeds ter after pressing sewing/cycle sewing) presser size. reset key.
  • Page 86 Error code Description How to recover Place of recovery E731 Main motor hole sensor defectiveness or position Turn OFF the sensor defectiveness power. When hole sensor or position sensor of sewing machine motor is defective. E733 Reverse rotation of main shaft motor Turn OFF the When sewing machine motor rotates in reverse direction.
  • Page 87 Error code Description How to recover Place of recovery E918 Abnormality of temperature of heat sink for main Turn OFF the control p.c.b. power. When temperature of heat sink of main control p.c.b. is 85°C or more. E943 Defectiveness of EEP-ROM of main control p.c.b Turn OFF the When data writing to EEP-ROM is not performed.

  • Page 88: Troubles And Corrective Measures

    IX. TROUBLES AND CORRECTIVE MEASURES Troubles Causes Corrective measures Page 1. Needle thread break- 1. Thread tension at parallel section is too ○ Decrease the thread tension at parallel high. section. 2. Pressure or stroke of thread take-up spring ○ Decrease the tension of thread take-up is too large.
  • Page 89 Troubles Causes Corrective measures Page 8. Thread frays. 1. Number of stitches of tie stitching is too ○ Increase the number of stitches of tie small. stitching at the end of sewing. 2. Width of tie stitching is too wide. ○...

  • Page 90: Drawing Of The Table

    X. DRAWING OF THE TABLE – 87 –...
  • Page 91 ● Drawing of the table for the sewing machine with a two-pedal unit – 88 –...

  • Page 92: Initial Value Data For Each Shape Table

    XI. INITIAL VALUE DATA FOR EACH SHAPE TABLE Shape selection Level 3 (31 shapes) Item Unit Shape selection Level 2 (20 shapes) Shape selection Level 1 (12 shapes) S001 Sewing shape S002 Cloth cutting length 12.7 12.7 12.7 12.7 12.7 12.7 12.7 12.7...

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