Related Manuals for Mitsubishi Electric LU2-4400-B0B
Summary of Contents for Mitsubishi Electric LU2-4400-B0B
- Page 1 LOCKSTITCH COMPOUND FEED INDUSTRIAL SEWING MACHINES MODEL LU2-4400-B0B (Single-Needle) LU2-4420-B0B (Double-Needle) INSTRUCTION MANUAL A180E269P02...
- Page 2 INTRODUCTION Thank you very much for purchasing Mitsubishi industrial sewing machine. Please read this instruction manual before operating the sewing machine. Please read also “Safety Manual” , “Instruction manual for Mitsubishi Limiservo X” and operate the sewing machine correctly and safely. PRECAUTION BEFORE STARTING OPERATION Safety Precautions 1 . When turning the power on, keep your hands and fingers away from the area around/ under the needle and the area around the pulley. 2 . The power must be turned off when the machine is not used, or when the operator leaves his/her seat. 3 . The power must be turned off before tilting the machine head, installing or removing the “V” belt, adjusting the machine, or replacing parts. 4 . Avoid placing fingers, hairs, obstacles, etc. near the pulley, “V” belt, bobbin winder wheel, or motor when the machine is in operation. Injury could result. 5 . Don’t put fingers into the thread take-up lever cover, around/under the needle, or pulley when the machine is in operation. 6 . If the belt cover, the finger guard, and/or the eye guard are installed, don’t operate the machine without these safety devices.
-
Page 3: Table Of Contents
CONTENTS USAGE PRECAUTION ……………………………………………… 1 1 Lubrication (1) ………………………………………………………………………… 1 2 Lubrication (2) ………………………………………………………………………… 1 3 Lubrication condition … ……………………………………………………………… 2 4 Adjustment of lubrication to the rotating hook ………………………………… 2 5 Installation of the belt cover ……………………………………………………… 2 6 Precaution on operation …………………………………………………………… 2 HOW TO USE ……………………………………………… 3 1 Installation of needles ……………………………………………………………… 3 2 Winding of the bobbin thread ……………………………………………………… 3 3 Selection of the thread ………………………………………………………………... -
Page 4: Usage Precaution
USAGE PRECAUTION 1 Lubrication (1) 2 Lubrication (2) Fill the oil reservoir with oil up to “H” mark. When a new sewing machine is used for the Oil level should be periodically checked. If oil level first time, or sewing machine left out of use for is found below “L” level replenish oil to “H” level. considerably long time is used again, replenish a For oil, use “MC70M” specified by Mitsubishi. suitable amount of oil to the portions indicated by ※ Refer arrows in the below figure. MC70M ： Specific gravity (15℃ ) = 0.86 (g/cm ：Viscosity (40℃ ) = 10.9 (mm Oil level mark From the library of Superior Sewing Machine & Supply LLC - www.supsew.com —... -
Page 5: Lubrication Condition
USAGE PRECAUTION 3 Lubrication condition 4 Adjustment of lubrication to the rotating hook See dripping of oil through the oil sight window to check oiling condition during operation. Confirm that oil has been drained from the oil tank when the operation is stopped. When dust, etc. accumulate in the oil tank, remove the rubber plug to clean. Adjusting Decrease Increase screw Rubber plug Oil sight window 5 Installation of the belt cover 1 . Install the belt cover on the machine side for safety. Refer to the provided instruction document contained in the same package. 2 . Install the belt cover on the motor side for safety. 6 Precaution on operation ( 1 ) When the power is turned on or off, keep foot away from the pedal. -
Page 6: How To Use
HOW TO USE 1 Installation of needles Note: Before installing the needles, be sure to turn off the power. Double-Needle Single-needle Insert the needle upto the bottom of needle Insufficient insertion Needle distorted clamp and tighten the screw keeping the long groove side of needle face to face Long grooves are opposite Long groove left side 2 Winding of the bobbin thread Note: When bobbin thread is wound, keep the presser foot lifted. Adjustment ●Tension of wound thread Slack winding is recommended for polyester thread and nylon thread. -
Page 7: Selection Of The Thread
HOW TO USE 3 Selection of the thread It is recommended to use “S” twist thread in the left needle (viewed S twist thread from front), and “Z” twist thread in the right needle. When discriminate use of needle threads is impossible, use “Z” twist thread in both the needles. Z twist thread For bobbin thread, “S” twist thread as well as “Z” twist thread can be used. 4 Threading of needle threads 1 . Pass each needle thread through thread guide (A). Note: When thin slippery thread (polyester thread or filament thread, etc.) is used, Pass the thread through thread guide (B) as well. 2 . With the thread take-up lever located at the upper most position, pass each needle thread in the order shown in the following figure. -
Page 8: Adjustment Of Feed (Stitch) Length And Backstitch
HOW TO USE 5 Adjustment of feed (stitch) length and backstitch ● A djustment of feed (stitch) length…Adjust feed Feed length setting dial length by turning the feed length setting dial while depressing the reverse sewing lever. ● B ackstitch…Direction of stitching can be reversed by depressing the reverse sewing Reverse sewing lever lever. 6 Setting of bobbins Thread ( 1 ) Pull out 5cm thread tail from bobbins. Bed slide ( 2 ) Put bobbins into hooks in the direction as the following figure. Hook Hook Bed slide From the library of Superior Sewing Machine &... -
Page 9: Threading Of Bobbin Threads
HOW TO USE 7 Threading of bobbin threads 9 Balance of threads tension ( 1 ) Put bobbin thread into the slit ①, pass under A ○ the lug ② and extend it above the bed. Balanced tension Thread ① B × Tight the needle thread tension or loose the bobbin thread tension C × Loose the needle thread tension or tight the bobbin thread tension Thread ② Opener : Adjustment of needle threads tension ( 2 ) While holding two needle threads with your ● N eedle threads tension should be adjusted on left hand, turn the pulley one rotation with the basis of bobbin threads tension. -
Page 10: B Timing Between The Rotating Hook Motion And The Needle Motion
HOW TO USE B Timing between the rotating Screw Ⓐ hook motion and the needle motion In case of double-needle, adjust right and left timing in the same way at the same time. Note: If you remove the presser foot, the throat plate, and the feed dog, it makes easier to adjust. Set Screw Ⓒ ( 1 ) Set feed length to 6mm. Screw Ⓑ ( 2 ) Loosen all screws Ⓐ, Ⓑ, Ⓒ. Note: Be careful not to disengage the large (a) Position of the needle bar: (b) Position of the needle bar: gear and the small gear. The lowest position 2.4mm lifted position from (a) ( 3 ) Lift the needle bar 2.4mm from the lowest position. Refer to timing marks shown in the figure. -
Page 11: C Adjustment Of The Feed Dog Height
HOW TO USE C Adjustment of the feed dog height The feed dog height and the presser foot pressure must be adjusted according to the fabric. ◆ The fabric will be damaged if the feed dog extends too high, or if the presser foot Feed dog pressure is too large. 1.2mm ◆ An even stitch length cannot be assured if Throat plate the feed dog is too low, or if the presser foot pressure is too small. ◆ The feed dog height is the position where the needle is at the top position. Adjustment of the feed dog height ( 1 ) Lean the machine head backward. ( 2 ) Turn the pulley by hand and stop it at the position where the feed dog rises to the maximum height. -
Page 12: D Relationship Between The Rotating Hook Motion And The Thread Take-Up Lever Motion
HOW TO USE D Relationship between the rotating Black line on boss of lower shaft bearing hook motion and the thread take-up lever motion Timing belt When the timing belt is removed for replacement, etc., the relation between the rotating hook motion and the thread take-up lever motion should be adjusted as follows: ( 1 ) Turn the pulley and stop when the thread take-up lever is lifted to the highest position. ( 2 ) Lean the machine head backward and check that the arrow (timing mark) put on the timing belt is aligned with the black line on the boss of lower shaft bearing. ( 3 ) If the timing mark is not in line with the Timing belt pulley black line, remove the timing belt and install Timing mark (arrow) it again to adjust. -
Page 13: F Relationship Between The Needle Motion And The Feed Dog Motion
HOW TO USE F Relationship between the needle Feed rock shaft crank (middle) motion and the feed dog motion Feed rock shaft crank (right) ( 1 ) Set the stitch length to “0” on the feed length setting dial. Ⓐ Screw ( 2 ) Set the needle at the lowest position. ( 3 ) Lean the machine head backward. Ⓑ Screw ( 4 ) Loosen the feed rock shaft crank set screws Link Ⓐ, Ⓑ. -
Page 14: G Safety Clutch
HOW TO USE G Safety clutch Timing belt pulley ● A safety clutch is installed to prevent the Safety clutch hook or timing belt damage if the thread is caught in the hook when the machine is loaded abnormally during operation. 1 ） Function of the safety clutch Bushing ( 1 ) When the safety clutch functions, the timing belt pulley will be freed, and the lower shaft rotation will stop. The upper shaft only will rotate. Stop the operation of the machine. ( 2 ) Completely remove the thread, etc. caught in the hook. ( 3 ) Turn the bushing by hand, and check Pulley whether the lower shaft rotates lightly and properly, then install the clutch device as before. -
Page 15: H Adjustment Of Upper Feed Length (Needle Side)
HOW TO USE H Adjustment of upper feed length (needle side) Feed rock shaft crank (right) Push button engaging part If uneven feeding occurs according to the fabric, Upper feed decreases adjust the long hole of the feed rock shaft crank Link (right) to adjust the upper feed length. (Needle bar rock link) Reference line Upper feed increases (How to adjust) Special bolt ( 1 ) Loosen the special bolt. ( 2 ) Move the special bolt upward to decrease the upper feed. ( 3 ) Move the special bolt downward to increase the upper feed. (The upper feed and the lower feed theoretically become equal when the center of the special bolt matches the reference line of the feed rock shaft crank) ( 4 ) After adjusting, tighten the special bolt. - Page 16 HOW TO USE 2 . Alternating up and down movement. A good feed condition is attained when the alternating up and down movement is changed between the outside presser foot and the inside Equality presser foot depending on the kind of fabric. 〈Equality up and down movement〉 For example) Reducing the up and down movement of the outside presser foot and increasing it of (High) the inside presser foot may be effective for Height of the inside presser foot stitching the slippery fabric. Height of the outside presser foot (How to adjust) (Low) 〈Inequality up and down movement〉 ( 1 ) Turn the pulley and stop it at the position where the thread take-up lever comes to the lowest. ( 2 ) Down the presser foot. Arm Ⓑ...
-
Page 17: Specifications
SPECIFICATIONS LU2-4400-B0B・LU2-4420-B0B Specifications Model LU2-4400-B0B LU2-4420-B0B Specifications Number of needles Single-Needle Double-Needle Application Heavy material Max. sewing speed (rpm) 2000 Stitch length (mm) 0 to 9 Hand Presser foot stroke (mm) Knee Needle DP × 17 #23 Needle bar stroke (mm) 36.0 Thread take-up lever stroke (mm) 74.5 Vertical stroke of upper feed (mm) 2.0 to 6.0 Hook (horizontal rotating hook) Large Lubrication system Automatic lubrication Bed dimensions (mm) 517 × 178 Standard 6.4... - Page 18 From the library of Superior Sewing Machine & Supply LLC - www.supsew.com...
- Page 19 From the library of Superior Sewing Machine & Supply LLC - www.supsew.com...
- Page 20 From the library of Superior Sewing Machine & Supply LLC - www.supsew.com printed in Japan...