JUKI LU-2810 Instruction Manual
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JUKI LU-2810 Instruction Manual

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See also: Engineer's Manual
LU-2810, 2810-7, 2860, 2860-7
INSTRUCTION MANUAL

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Summary of Contents for JUKI LU-2810

  • Page 1 LU-2810, 2810-7, 2860, 2860-7 INSTRUCTION MANUAL...

  • Page 2: Table Of Contents

    27. ADJUSTING THE AUTOMATIC PRESSER FOOT LIFTER ........26 28. FIXING THE FEED ADJUSTING DIAL ................ 27 29. NORMAL-/REVERSE-FEED STITCH NEEDLE ENTRY POINTS ALIGNMENT AT THE TIME OF AUTOMATIC REVERSE FEED STITCHING (LU-2810-7, LU-2860-7) ..28 30. OPERATION SWITCHES (LU-2810-7, LU-2860-7) ............. 29 31. KNEE SWITCH ......................31 32.

  • Page 3: Before Operation

    BEFORE OPERATION CAUTION : Check the following so as to prevent maloperation of and damage to the machine. • Before you put the machine into operation for the first time after the set-up, clean it thoroughly. Remove all dust gathering during transportation and oil it well. • Confirm that voltage has been correctly set. Confirm that the power plug has been properly connected to the power supply. • Never use the machine in the state where the voltage type is different from the designated one. • The direction of normal rotation of the machine is counterclockwise as observed from the pulley side. Take care not to allow the machine to rotate in the reverse direction. • Never operate the machine unless the machine head and the oil tank have been filled with oil. • For a test run, remove the bobbin and the needle thread. • For the first month, decrease the sewing speed and run the sewing machine at a speed of 80% or less of the maximum sewing speed. As to the maximum sewing speed, see "25. SEWING SPEED TABLE" p.24. • Operate the handwheel after the machine has totally stopped.

  • Page 4: Specifications

    1. SPECIFICATIONS LU-2810-7 LU-2860-7 Model LU-2810 (1-needle) (1-needle with thread LU-2860 (2-needle) (2-needle with thread trimmer) trimmer) Max. 3,000 sti/min Max. 2,700 sti/min Sewing speed "25. SEWING SPEED TABLE" p.24. Stitch length (max.) Normal feed : 9 mm Reverse feed : 9 mm GROZ-BECKERT 135 x 17 Needle (Nm 125 to Nm 180) (Standard : Nm 160) Thread #30 to #5 (US : #46 to #138, Europe : 20/3 to 60/3) Hook Vertical-axis 2.0-fold capacity hook Lift of presser foot Hand lifter lever : 10 mm By knee lifter, Auto-lifter: 20 mm JUKI New Defrix Oil No.1 or JUKI MACHINE OIL #7 Lubricating oil - Equivalent continuous - Equivalent continuous - Equivalent continuous - Equivalent continuous...
  • Page 5 Do not put protruding articles such as the screwdriver and the like at the location where the sewing machine is placed. Attaching the hinge seats and the support rub- bers of the machine head ❸ Fix hinge seat ❶ , machine head support rubber ❶...
  • Page 6 6) Install hinge ❺ on the bed with screw ❻ . Engage the hinge with the rubber hinge of the ❺ table. Then, place the machine head on the machine head support rubber. ❻ 7) Securely attach head support rod ❼ to the table until it goes no further. ❼ 8) Put reflux pipe ❾ in the oil reservoir of oil pan ❽ . Secure the pipe in groove  . ❽ 9) Fix filter  and filter clamp  with fitting  . ❾ 10) Mount spacers  supplied with the machine head on the frame. 11) Install bracket  on CP panel  with screws  supplied with the panel. 12) Install bracket  on spacer  with screws  supplied with the machine head and washers  supplied with the panel. Do not use the screws supplied the panel instead of screws  supplied with the ma- chine head.

  • Page 7: Adjusting The Belt Tension (Lu-2810, Lu-2860)

    3. ADJUSTING THE BELT TENSION (LU-2810, LU-2860) 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.

  • Page 8: Installing The Oil Shield

    LU-2860, LU-2860-7 ❷ ❶ 6. PNEUMATIC COMPONENTS (LU-2810-7, LU-2860-7) 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.
  • Page 9 (2) Adjusting the air pressure Decrease Increase The operating air pressure is 0.5 to 0.55 MPa. ❶ Adjust the air pressure using air pressure regulating knob ❶ of the filter regulator. (3) Exhaust tube Pass ø8 exhaust tube ❶ coming from the sewing machine through hole ❷ in the table. In the case of high humidity, water may flow out from the exhaust tube. ❶ ❷ – 7 –...

  • Page 10: Installing The Thread Stand

    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. Assemble the thread stand, set it up on the machine LU-2810, LU-2810-7 table using the installation hole in the table and tight- en nut ❶ gently.

  • Page 11: Lubrication

    ■ Lubrication procedure Fill the oil tank with oil before operating the sewing machine. Fill the oil tank with JUKI NEW DEFRIX OIL No.1 (Part No. : MDFRX1600C0) or JUKI MACHINE OIL #7 (Part No. : MML007600CA) using the oiler supplied with the machine from section C.
  • Page 12 ❸ ❹ ❺ ❻ ■ Adjusting the oil quantity in the hook LU-2810, LU-2810-7 Remove rubber cap ❶ . Loosen nut ❷ and turn oil amount adjustment screw ❸ to adjust the amount of oil in the hook. Turning the screw clockwise A will decrease the amount of oil in the hook or counterclockwise B...

  • Page 13: Attaching The Needle

    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. Switch "off" the motor. LU-2810, LU-2810-7 Use 135x17 needles. Turn the handwheel to bring the needle bar to ❷...

  • Page 14: Attaching And Removing The Bobbin

    10. ATTACHING AND REMOVING THE BOBBIN 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) Lift latch ❶ of hook, and take out the bobbin.

  • Page 15: Installing The Thread Guide Pin

    12. INSTALLING THE THREAD GUIDE PIN Insert needle thread guide pin ❶ into the corre- LU-2810, LU-2810-7 sponding hole in top cover ❷ . ❷ ・LU-2810, LU-2810-7: One needle thread guide pin ・LU-2860, LU-2860-7: Two needle thread guide pins ❶ LU-2860, LU-2860-7 ❷...

  • Page 16: Threading The Machine Head

    14. THREADING THE MACHINE HEAD [LU-2810, 2810-7] 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.
  • Page 17 [LU-2860, 2860-7] 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. ❶ ❶ Left-hand needle thread Right-hand needle thread...

  • Page 18: Adjusting The Stitch Length

    (2) Manual one-touch reverse feed stitching 1) Press touch-back switch ❺ . 2) Reverse feed stitches are made as long as you keep pressing the lever down. 3) Release the switch, and the machine will run in the normal feed direction. (3) Changing over the stitching pitch (LU-2810-7 ❺ and -2860-7) 1) Press stitching pitch changeover switch ❻ to change over the stitch length to the one cor- responding to the scale mark on the 2P feed ad- justing dial. (The LED on the switch lights up.) 1. Set 2P feed adjusting dial ❷ at a value smaller than the value set by standard feed adjusting dial ❶...

  • Page 19: Thread Tension

    16. THREAD TENSION (1) Adjusting the needle thread tension 1) Turn thread tension nut No. 1 ❶ clockwise A to shorten the length of thread remaining on the ❶ top of needle after thread trimming. Turn the nut ❷ counterclockwise B to lengthen it. 2) Turn thread tension nut No. 2 ❷ clockwise A to increase the needle thread tension, or counter- clockwise B to decrease it. Apply the same tension to both of the thread tension nut No. 2. In the case, the length of thread remaining at the needle tip cannot be increased, re- place the spring of tension controller No.

  • Page 20: Thread Take-Up Spring

    (1) When you want to change the stroke of the thread take-up spring 1) Loosen screw ❷ . Adjust thread take-up spring ❶ by moving it in the slot. 2) Loosen screw ❹ . Adjust thread take-up spring ❸ by moving thread take-up spring adjusting plate ❺ along thread take-up spring base ❻ . The LU-2810 and -2810-7 do not have thread take-up spring ❸ . ❷ ❹ ❸ ❶ ❺...

  • Page 21: Hand Lifter

    18. HAND LIFTER To lift the presser foot manually, pull hand lifter ❶ in the direction of the arrow. This makes the presser foot rise 10 mm and stay at that position. ❶ 19. ADJUSTING THE PRESSURE OF THE PRESSER FOOT 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. Turn presser spring regulating dial ❶ clockwise A to increase the pressure of the presser foot, or counter- clockwise B to decrease it.

  • Page 22: Needle-To-Hook Relation

    To protect the relevant parts from contact, shift the thread stand to a position at which the thread stand does not interfere with the control panel. [Only for the LU-2810-7 and LU-2860-7] To check the needle bar position as described in the aforementioned 2) [i.e., "...the needle bar ascend by 2.3 mm from the lowest position of its stroke"], you may use the display of the main shaft rotation...

  • Page 23: Adjusting The Hook Needle Guard

    21. ADJUSTING THE HOOK NEEDLE GUARD 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 a hook has been replaced, be sure to check the position of the hook needle guard.

  • Page 24: Adjusting The Bobbin Case Opening Lever

    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. LU-2810, LU-2810-7 1) Turn the handwheel in the normal direction of ❸...

  • Page 25: Position Of The Counter Knife And Adjustment Of The Knife Pressure

    3) Loosen setscrews ❷ in the moving knife. Turn the handwheel to move the moving knife and adjust the knife pressure. As the standard adjustment, the knife pressure is applied from the time when the distance from the tip of the moving knife to the tip of the count- er knife becomes 6 to 7 mm for the LU-2810-7, and 8 to 9 mm for the LU-2860-7. Adjust the knife pressure in the state that the clamp spring does not come in contact with the moving knife (the clamp pressure is not developed). Be sure to carefully prevent from getting injured by the moving knife, counter knife, blade point of the hook, etc.

  • Page 26: Adjusting The Amount Of The Alternating Vertical Movement Of The Walking Foot And The Presser Foot

    Make sure that the presser foot interferes with neither the walking foot nor the presser bar before operating the sewing machine. 25. SEWING SPEED TABLE Operate the sewing machine at a speed equal to or lower than the maximum sewing speed selected from those shown in the table below according to the sewing conditions. For the LU-2810-7 and -2860-7, the sewing speed is automatically set according to the amount of the alter- nating vertical movement of the walking foot and the presser foot. In the case the stitch length exceeds 7 mm, change the maximum sewing speed referring to "6. Function set- ting of SC-922" in the Instruction Manual for the SC-922. Amount of alternate vertical movement Stitch length : More than 7 Stitch length : 7 mm or less of the walking foot and presser foot...

  • Page 27: Resetting The Safety Clutch

    26. RESETTING THE SAFETY CLUTCH 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. The safety clutch functions when an excessive load is applied to the hook or the other components dur- ing sewing. At this time, the hook will never rotate...

  • Page 28: Adjusting The Automatic Presser Foot Lifter

    27. ADJUSTING THE AUTOMATIC PRESSER FOOT LIFTER 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) Turn the power ON. Carry out thread trimming once. Turn ON the automatic presser lifter.

  • Page 29: Fixing The Feed Adjusting Dial

    1) Remove rubber cap ❶ . Tighten screws ❷ . ❷ ❶ To prohibit the adjustment of the feed adjusting dial: 1) Remove the motor cover or the belt cover. 2) Insert stopper pin ❺ and screw ❻ in tapped ❹ hole ❸ (or holes ❸ and ❹ for the LU-2810-7 and -2860-7) and tighten it. Stopper pin ❺ and screw ❻ are separately ❺ ❻ available. ❸ Part number of stopper pin : TA0440401MO...

  • Page 30: Normal-/Reverse-Feed Stitch Needle Entry Points Alignment At The Time Of Automatic Reverse Feed Stitching (Lu-2810-7, Lu-2860-7)

    29. NORMAL-/REVERSE-FEED STITCH NEEDLE ENTRY POINTS ALIGNMENT AT THE TIME OF AUTOMATIC REVERSE FEED STITCHING (LU-2810-7, LU-2860-7) When the sewing speed or stitch pitch is changed, the normal- and reverse-feed stitch needle entry points may not be aligned at the time of automatic reverse feed stitching. In such a case, correct the alignment of needle entry points by changing the ON/OFF timing of the automatic reverse feed cylinder. If it is difficult to correct the timing of the automatic reverse feed cylinder because of the large stitch pitch, it is recommended to decrease the reverse feed stitching speed. Refer to "III-8. Detailed explanation of selection of functions ⑯ Compensation of timing of the solenoid for reverse feed stitching" in the Instruction Manual for the SC-922 for detail. Normal- and reverse-feed stitches may need to be adjusted according to the stitch pitch to be used. Refer to the Engineer's Manual for how to adjust the stitches. 1) How to align needle entry points of the reverse feed stitching with those of the normal feed stitching Carry out "correction of the timing of the reverse feed stitching" according to the difference between the needle entry points of the reverse feed stitching and those of the normal feed stitching. Refer to "III-6. Setting the SC-922 functions" in the Instruction Manual for the SC-922 for how to carry out the "correction of the timing of the reverse feed stitching". ① ON-timing of the reverse feed Sewing starting position stitching at the beginning of sewing (Function setting No. 51) Stitch length...

  • Page 31: Operation Switches (Lu-2810-7, Lu-2860-7)

    30. OPERATION SWITCHES (LU-2810-7, LU-2860-7) ❶ Alternating vertical movement amount change-over switch If this switch is pressed the amount of the alternating vertical movement of the walking foot and the presser foot will be maximized. (Lamp above the switch lights up) Use this switch when a multilayered portion of the sewing product is not smoothly fed. To change over the amount of the alternating vertical movement of the walking foot and the ❶ ❷ ❸ ❹ ❺ ❻ presser foot by means of the knee switch, join the knee switch and the mounting plate, supplied with the unit, together and fix them on the table with wood screw. For the wiring, refer to "31. KNEE SWITCH" p.31. ❷ Automatic reverse feed stitching cancellation/addition switch • If this switch is pressed when the following automatic reverse feed stitching has been specified, the...
  • Page 32 ・Standard feed adjusting dial scale : 9 ・If this switch is pressed, stitch length is changed over from 9 to 6. ・If this switch is pressed again, stitch length returns from 6 to 9. ❺ Needle thread tension changeover switch When the switch is pressed, the double tension function is selected to increase the needle thread ten- sion. (The lamp above the switch is lit up.) ❻ This is not used for the LU-2810-7 and -2860-7. – 30 –...

  • Page 33: Knee Switch

    31. KNEE SWITCH (1) Installation of the knee switch 1) Install knee switch mounting plate ❶ on the ❶ underside of the table with wood screw ❷ sup- plied with the unit. 2) Install knee switch ❸ on the knee switch mount- ing plate with tapping screw ❹ and washer ❺ ❷ supplied with the unit. 3) Connect the knee switch to #4 and #11 pins of the machine connector 14P which is connected to CN36 of the machine controller. (2) Functions of the knee switch ❹ ❸ ❺ If knee switch ❸ is pressed, the amount of the al- ternating vertical movement of the walking foot and the presser foot will be maximized. (Same with the Black (No.
  • Page 34 (3) Function setting of the knee switch ・CP-18 ❶ ❷ ❸ ❹ 1) Enter the function setting mode referring to "6. Setting of functions of SC-922, 1)" in the Instruction Manual for the SC-922. 2) Press switch ❶ or switch ❷ to call out function setting No.12 (option input/output function selection). 3) Press switch ❸ or switch ❹ and select the item for “in”. 4) Press switch ❷ and select display No.i31. The lamps will be on alternately. 5) Press switch ❸ or switch ❹ to select the knee switch function. Refer to list 1 for the details of the functions.
  • Page 35 ❶ ・CP-180 ❸ ❷ 1) Enter the function setting mode referring to "18. FUNC- TION SETTING SWITCH, 1)" in the Instruction Manual for the CP-180. 2) Select function number 12 according to the function setting method. 3) Select the item of " " by switch ❸ . 4) Select the displayed number " " by means of switch ❷ . 5) Select the knee switch function by switch ❸ . Refer to list 1 for the details of the functions. The lamps will be on alternately. 6) Fix the knee switch function by switch ❷ . 7) The above function is fixed by switch ❷ . 8) The option input is ended by switch ❷...

  • Page 36: Motor Pulley And V-Belt (Lu-2810, Lu-2860)

    32. MOTOR PULLEY AND V-BELT (LU-2810, LU-2860) The M-type belt should be used. The relation between the motor pulley and belt length and the sewing speed is as shown below. Effective diameter Number Number of Effective diameter of Sewing speed...

  • Page 37: Troubles In Sewing And Corrective Measures

    33. TROUBLES IN SEWING AND CORRECTIVE MEASURES Troubles Causes Corrective measures ① Thread path, needle point, hook blade point or ○ Remove the sharp edges or burrs on the blade 1. Thread breakage (Thread frays or is worn bobbin case resting groove on the throat plate point of hook using a fine emery paper. Buff up the out.) has sharp edges or burrs. bobbin case resting groove on the throat plate. ② Needle thread tension is too high. ○ Decrease the needle thread tension. ③ Bobbin case opening lever provides an ○ Decrease the clearance provided between the excessive clearance at the bobbin case. bobbin case opening lever and the bobbin. "22. ADJUSTING THE BOBBIN CASE Refer to OPENING LEVER"...

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Lu-2860-7Lu-2810-7Lu-2860

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