JUKI LU-2220N-7 Instruction Manual
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JUKI LU-2220N-7 Instruction Manual

JUKI LU-2220N-7 Instruction Manual

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ENGLISH
LU-2220N-7
INSTRUCTION MANUAL

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Summary of Contents for JUKI LU-2220N-7

  • Page 1 ENGLISH LU-2220N-7 INSTRUCTION MANUAL...

  • Page 2: Table Of Contents

    CONTENTS 1. SPECIFICATIONS ........................1 2. INSTALLATION ........................1 3. ADJUSTING THE BELT TENSION ..................2 4. INSTALLING THE SYNCHRONIZER SUPPORT ROD ............3 5. ATTACHING THE BELT COVER ..................... 3 6. INSTALLING THE KNEE SWITCH ..................4 7. INSTALLING THE AIR DRIVE UNIT ..................4 (1) Installing the air control unit .......................
  • Page 3 25. ADJUSTING THE THREAD TRIMMING MECHANISM COMPONENTS ........ 16 (1) Positioning the thread trimming cylinder joint ................16 (2) Moving knife (Adjusting the vertical position) ................17 (3) Counter knife (Adjusting the vertical position) ................18 (4) Thread guide installing position ....................... 18 (5)-1.

  • Page 4: Specifications

    Lift of presser foot Hand lifter lever : 9 mm Knee lifter : 6 mm Lubricating oil JUKI New Defrix Oil No.  - Equivalent continuous emission sound pressure level (L ) at the workstation : A-weighted value of 85.5 dB; (Includes K = 2.5 dB);...

  • Page 5: Adjusting The Belt Tension

    Fix oil pan 1 supplied with the machine on the Operator’s side Table Align table in 8 places with wood screws. 20 mm 50 mm Align Attach drain plug 2 , oil seal 3 and washer 4 to the oil pan. Attach packing 6 and washer 9 to screw 5 and fix them with nut 7 .

  • Page 6: Installing The Synchronizer Support Rod

    4. INSTALLING THE SYNCHRONIZER SUPPORT ROD WARNING : Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine. Attach synchronizer support rod 1 to the arm using attaching nut 2 . 5.

  • Page 7: Installing The Knee Switch

    6. INSTALLING THE KNEE SWITCH Attach supporting base 2 of knee switch 1 onto the underside of the table using wooden screws Fix cord 4 to an appropriate position on the table using a staple supplied with the machine so as to prevent the cord from hindering the operation. 7. INSTALLING THE AIR DRIVE UNIT WARNING : Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of...

  • Page 8: Connecting The Air Hose

    (2) Connecting the air hose Connect the air hoses coming from the air control unit to the air cylinders of the sewing machine as shown in the illustration. Adjust the seal Nos. pasted on the hoses to those pasted on the joints, and connect as described in the list.

  • Page 9: Adjusting The Air Pressure

    Pass air hoses 5 through cord cover !2 the same as 6-range switch cord 6 , pass them through clearance A between 6-range switch !3 and the machine arm, and connect them to the joint of air hoses 5 . Solenoid valve Cylinder Condensaton...

  • Page 10: Installing The Thread Stand

    Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine. Pour the JUKI New Defrix Oil No.  into the oil tank in the bed from lubrication hole 1 until H level 3 of oil gauge 2 is reached.
  • Page 11 Supply oil Supply oil Supply oil Flg.1 [Cleaning the filter] Approximately once a month, remove screws 6 from the filter case and clean magnet 7 and filter element 8 inside the filter. If the filter is clogged with soil, circulation failure will result.

  • Page 12: Attaching The Needle

    10. ATTACHING THE NEEDLE WARNING : Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine. Use a SCHMETZ 34 x 35R needle. Turn the handwheel to bring the needle bar to the highest position of its stroke.

  • Page 13: Threading The Hook

    12. THREADING THE HOOK WARNING : Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine. Pass the thread through thread path 1 in the hook and thread hole 2 in the lever, and draw the thread.

  • Page 14: Winding A Bobbin

    14. WINDING A BOBBIN WARNING : Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine. Pass the thread in the order, A through H . Then wind it several turns round the bobbin. Tilt bobbin presser 1 .

  • Page 15: Threading The Machine Head

    16. THREADING THE MACHINE HEAD WARNING : Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine. Thread the machine head following the order of A Needle thread through to P as shown in the illustration given above. Threading method : draw the thread to the operator's side. − 12 −...

  • Page 16: Adjusting The Stitch Length

    17. ADJUSTING THE STITCH LENGTH Turn standard feed adjusting dial 1 or 2P feed ad- justing dial 3 counterclockwise or clockwise so that the number corresponding to the desired number is brought to the top of the dial until the marking spot is reached.

  • Page 17: Thread Take-Up Spring

    19. THREAD TAKE-UP SPRING (1) When you want to change the stroke of the spring : Loosen screw 2 in the stopper, and move stopper 3 to the right or left to change stroke of thread take-up spring 1 . Move the stopper to the right to increase the stroke of the thread take-up spring, or the left to decrease it.

  • Page 18: Needle-To-Hook Relation

    22. NEEDLE-TO-HOOK RELATION WARNING : Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine. 0.02 - 0.1 mm Adjust the standard feed adjusting dial to "0". Loosen hook driving shaft set collar clamping screw 3 , and turn the handwheel counterclockwise to make the needle bar ascend by 2.0 mm from the lowest position of its stroke.

  • Page 19: Adjusting The Bobbin Case Opening Lever

    24. ADJUSTING THE BOBBIN CASE OPENING LEVER WARNING : Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine. Turn the handwheel to move bobbin case opening lever 1 in the direction of the arrow A , and loosen screw 2 .

  • Page 20: Moving Knife (Adjusting The Vertical Position)

    (2) Moving knife (Adjusting the vertical position) Loosen moving knife drive arm clamping screw 1 and moving knife shaft thrust collar setscrew 2 and tighten them again after adjusting the vertical direction of moving knife 3 . When tightening moving knife drive arm clamping screw 1 , perform the items (6), (7), (8) and (9) that are mentioned later.

  • Page 21: Counter Knife (Adjusting The Vertical Position)

    (3) Counter knife (Adjusting the vertical position) Loosen counter knife base clamping screw 1 , adjust it to the position where the upper end of the blade section of counter knife 2 aligns with the top surface of moving knife 3 , and tighten the screw again.

  • Page 22: Counter Knife (Adjusting The Travel Amount) (Positioning Of The Counter Knife Base Stopper)

    (5)-1. Counter knife (Adjusting the travel amount) (Positioning of the counter knife base stopper) Turn the handwheel to bring counter knife to the lower dead point of the thread take-up lever, and loosen knife base stopper setscrews 1 and counter knife driving arm clamping screw 2 . When the top end of counter knife 3 is spaced 37.8 ±...

  • Page 23: Counter Knife (Adjusting The Lateral Position)

    (5)-2. Counter knife (Adjusting the lateral position) Loosen counter knife setscrews 1 . Set the stitch dial at "0," and set the thread take- up lever at the lower dead point. Manually actuate the solenoid valve to put the thread trimming cylinder into the state where it projects.

  • Page 24: Adjusting The Knife Pressure

    (6) Adjusting the knife pressure Set the thread take-up lever at the lower dead point. Manually actuate the solenoid valve to put the thread trimming cylinder into the state where it projects. (Press the manual switch of solenoid valve "(11) No.

  • Page 25: Initial Position Of The Moving Knife Drive Arm And The Moving Knife

    (7)-1. Initial position of the moving knife drive arm and the moving knife Tilt the sewing machine. Manually actuate the solenoid valve when the thread trimming cam roller does not fit in the cam groove to put the thread trimming cylinder into the state where it retracts.

  • Page 26: Mounting Position Of The Moving Knife Returning Plate

    (7)-2. Mounting position of the moving knife returning plate Maintaining a clearance of 0.05 to 0.5 mm between the periphery of thread trimming cam and the thread trimming cam roller and the periphery of thread trimming cam, bring moving knife returning plate 1 into contact with moving knife returning pin 2 , and secure the moving knife returning plate with moving knife returning plate setscrews 3 .

  • Page 27: Adjusting The Thread Trimming Cam Timing

    (8) Adjusting the thread trimming cam timing Loosen thread trimming cam setscrews 1 and tighten them again after adjusting the position of thread trimming cam 2 . The position of thread trimming cam is the position where thread trimming cam roller 3 comes in contact with R section where it starts entering the cam groove when the position of handwheel is at L engraved marker line.

  • Page 28: Installing Position Of The Clamp Spring

    (9) Installing position of the clamp spring When the moving knife rests at its initial position, loosen clamp screw setscrew 1 . Align the marker line on the top face of moving knife with the notch in clamp spring 2 . (It's a guide for adjustment) Bring the clamp section of clamp spring 2 into contact with the moving knife, and secure the...

  • Page 29: Adjusting The Condensation Amount

    (10) Adjusting the condensation amount Loosen lock nut 3 of reverse feed cylinder knuckle joint 2 . Adjust the clearance between the top end of reverse feed cylinder rod 1 and the end of reverse feed cylinder knuckle joint 2 referring to the standard of the table.

  • Page 30: Explanation Of The Solenoid Valve

    (11) Explanation of the solenoid valve 1 Condensation 2 BT 3 Thread trimming ON (Cylinder is pushed out.) 4 Thread trimming OFF (Cylinder is drawn.) 5 Thread clamp (Cylinder is pushed out.) 7 FL (Presser foot rises.) 8 FL (Presser foot lowers.) 9 DL (Cylinder is pushed out.) B ( C ) 2P With regard to the switch of solenoid valve (Manual)

  • Page 31: Adjusting The Lifting Amount Of The Presser Foot And The Walking Foot

    26. ADJUSTING THE LIFTING AMOUNT OF THE PRESSER FOOT AND THE WALKING FOOT The lifting amount of the presser foot and the walking foot is adjusted using dial 1 . Turn the dial clockwise to increase the lifting amount or counterclockwise to decrease it.

  • Page 32: Operation Switches

    29. OPERATION SWITCHES One-touch type reverse feed switch • While the machine is in operation, the machine performs reverse feed stitching as long as this switch is held pressed, and resumes normal feed stitching when the switch is released. • If this switch is pressed while the machine is at rest, the feed will be set to the reverse feed state.
  • Page 33 Needle lifting switch If this switch is pressed, the machine will travel from the needle-down stop position to the needle-up stop position. When raising the machine head which has been tilted, do not hold the operation switch to raise it. 2P switch Example If this switch is pressed, the stitch length is...

  • Page 34: Knee Switch

    Needle thread clamp switch When the needle thread clamp switch is turned ON, the needle thread clamp motion is performed at the start of sewing, and when it is turned OFF, the needle thread clamp motion is not performed. However, the needle thread clamp device as well as the presser foot lifting motion does not function until the thread trimming is performed after turn- ing ON the power.

  • Page 35: Troubles In Sewing And Corrective Measures

    32. TROUBLES IN SEWING AND CORRECTIVE MEASURES Troubles Causes Corrective measures . Thread 1 Thread path, needle point, hook ™ Remove the sharp edges or burrs on the breakage blade point or bobbin case resting blade point of hook using a fine emery (Thread frays groove on the throat plate has sharp paper.
  • Page 36 Troubles Causes Corrective measures 4. Thread slips off 1 Thread tension given by the ™ Decrease the thread tension given by the the needle eyelet tension controller No. 1 is too tension controller No. 1. simultaneously with high. thread trimming. 5. Thread slips off the 1 Thread tension given by the ™ Decrease the thread tension given by the needle eyelet at the...

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