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Summary of Contents for JUKI LU2-4410-B1T-CS
- Page 1 LOCKSTITCH COMPOUND-FEED AUTOMATIC UNDERTRIMMER INDUSTRIAL SEWING MACHINES MODEL LU2-4410-B1T-CS (Single-Needle) LU2-4430-B1T (Double-Needle) INSTRUCTION MANUAL A181E099P01...
- Page 2 INTRODUCTION PRECAUTION BEFORE STARTING OPERATION 1 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 . Donʼt 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, donʼt operate the machine without these safety devices. 2 Precaution before Starting Operation 1 . If the machineʼs oil pan has an oil sump, never operate the machine without filling oil in it.
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Page 3: Table Of Contents
CONTENTS PREPARATION FOR OPERATION ……………………………………………… 1 1 Adjustment of the needle stopping position … …………………………………… 1 USAGE PRECAUTION ……………………………………………… 2 1 Lubrication (1) ………………………………………………………………………… 2 2 Lubrication (2) ………………………………………………………………………… 2 3 Lubrication condition … ……………………………………………………………… 3 4 Adjustment of lubrication to the rotating hook ………………………………… 3 5 Precaution for the built-in type detector ………………………………………… 3 6 Installation of the belt cover ……………………………………………………… 3 7 Precaution on operation …………………………………………………………… 3 HOW TO USE ………………………………………………... -
Page 4: Preparation For Operation
PREPARATION FOR OPERATION 1 Adjustment of the needle stopping position 1 . Adjustment of UP position When the pedal is kicked down by heel, the machine stops at UP position. If marks deviate larger than 3mm, adjust as follows. ( 1 ) Disconnect the plug (12pins) of cable from the machine head. ( 2 ) Run the machine and stop at UP position. ( 3 ) While holding the pulley, insert the Adjusting tool in the hole Ⓐ, then turn the tool. 2 . Adjustment of Down position When the pedal is Neutral the machine stops at Down position. If marks deviate large than 5mm, adjust as follows. ( 1 ) Disconnect the plug (12pins) of cable from the machine head. ( 2 ) Run the machine and stop at ... -
Page 5: Usage Precaution
USAGE PRECAUTION Lubrication (2) Lubrication (1) Oil level mark — 2 —... -
Page 6: 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 Precaution for the built-in type detector 1 . Since the optical type detecting element is used in the detector, prevent dust or oil from sticking to the detecting plate when the sewing machine pulley is removed for adjustment. If they have stuck, wipe them off with soft cloth carefully so that the surface is not scratched, do not let oil permeate the clearance on the detecting plate. 2 . In case of disconnection of the position detector connector, running off the belt or complete constraint and over load, the motor is automatically turned off after predetermined time to prevent burning of the motor. (However, in case of half-constraint and over load, the power may not be turned off.) After the failure is eliminated, the normal operation is resumed by turning off the power once then turning on again. The same operation occurs for the detector malfunction or the line breakage. 6 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. -
Page 7: 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 S lack winding is recommended for polyester thread and nylon thread. ●Conically wound thread M ove the thread guide toward smaller diameter of wound thread layer. ●Amount of wound thread L oosen the winding amount adjustment screw to decrease thread winding amount and tighten the screw to increase thread winding amount. Winding tension Thread guide adjustment nut Even winding amount of 80% ... -
Page 8: 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. Note: Pushing the needle thread tension releasing button shown in the figure below opens the saucer of the needle thread tension adjuster, and the needle thread can easily pulled out. LU2-4410 LU2-4430 Thread tension ... -
Page 9: 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 pushing PUSH lever. ● B ackstitch…Direction of stitching can be reversed by depressing the reverse sewing Reverse sewing lever lever or pushing the touch back switch. ● T ouch back switch…In the case that the switch is turned to the arrow direction by 180° , no backward stitching occurs even when the switch is pushed. Use this function to avoid the malfunction such as unnecessary reverse stitching in the case that the fabric comes in contact with the switch during sewing. Touch back switch 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. -
Page 10: 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. your right hand. The bobbin threads will ● A djust needle threads tension by turning come up when needle threads are lifted up thread tension nuts. as shown in the figure. Needle threads and ... -
Page 11: 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. Link 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 Ⓒ Screw Ⓐ ( 2 ) Loosen two screws Ⓐ , and remove the link. ( 3 ) Loosen all screws Ⓑ , Ⓒ , Ⓓ . (a) Position of the needle bar: (b) Position of the needle bar: Note: Be careful not to disengage the large The lowest position 2.4mm lifted position from (a) gear and the small gear. ( 4 ) Lift the needle bar 2.4mm from the lowest ... -
Page 12: 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. ( 3 ) Loosen the feed bar screw. ( 4 ) Vertically move the feed bar (in the direction indicated by the arrow in the figure) to adjust it to an adequate height. ( 5 ) After adjusting, tighten the feed bar screw. -
Page 13: 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. E Relationship between the rotating Approx. 0.2mm hook motion and the opener motion ( 1 ) Turn the pulley by your hand and stop it at the position where the opener holder is ... -
Page 14: 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 Ⓐ, Ⓑ. ( 5 ) Adjust the distance between the pressure bar and the vibrating prevention bar to 9mm and temporary tighten the feed rock shaft crank set screws Ⓐ, Ⓑ. ( 6 ) Check that the feed rock shaft crank (right) is connected with the link at a right angle as ... -
Page 15: 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. Pushbutton 2 ） How to set safety clutch ( 1 ) While pushing down the pushbutton on the ... -
Page 16: H Adjustment Of Upper Feed Length (Needle Side)
HOW TO USE H Adjustment of upper feed Feed rock shaft crank (right) Push button length (needle side) engaging part Upper feed decreases If uneven feeding occurs according to the fabric, 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. Note: If the special bolt is overtightened, the link and the feed rock shaft crank (right) may not work. I A djustment of forward/ backward feed length Reverse stitch shaft crank... - Page 17 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) 〈Inequality up and down movement〉 (Low) ( 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 Ⓑ Eccentric cam ( 3 ) Loosen the feed lifting rock shaft crank set First screw Ⓒ...
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Page 18: K Installation Of The Movable Knife
HOW TO USE K Installation of the movable knife 1 . Initial position of the movable knife ( 1 ) Turn the pulley and stop it at the position where the needle comes to the lowest. ( 2 ) Put the cam roller into the thread trimmer cam groove by pushing the cam follower crank. ( 3 ) In this condition, turn the pulley and stop it at the position where the black mark point on the arm meets the white mark point on the pulley. Set the cam follower crank at this position with a screwdriver temporarily preventing the cam roller coming out from the cam groove. ( 4 ) Loosen bolts Ⓐ and Ⓑ. ( 5 ) Adjust so that the tip slant portion of the movable knife protrudes 0 to 0.5mm from the fixed knife, as shown in the figure and tighten bolts Ⓐ and Ⓑ. Movable knife Bolt Ⓐ Fixed knife Thread trimmer 0 to 0.5mm rocking crank Cam follower crank Cam roller Pitman rod Bolt Ⓑ... -
Page 19: L Installation Position Of The Thread Trimmer Cam
HOW TO USE L I nstallation position of the thread trimmer cam ( 1 ) Adjust so that the gap between the feed cam and the bushing is 17.3mm and then tighten Reverse block the screw Ⓐ to the flat on the lower shaft. ( 2 ) Place the thread trimmer cam on the end face of the bushing and the thread tension releasing cam on the end face of the thread Thread tension releasing cam trimmer cam (making the gap between each part zero), then tighten each screw. Bushing Screw Ⓐ Feed connecting rod 17.3mm Feed cam Thread trimmer cam M Adjustment of the thread trimmer cam ( 1 ) Turn the pulley and stop it at the position where the needle comes to the lowest. ( 2 ) Put the cam roller into the thread trimmer cam groove by pushing the cam follower crank. ( 3 ) Turning the pulley, adjust the thread trimmer cam so that the movable knife starts moving when the green mark point on the pulley comes in line with the black mark point on the arm. -
Page 20: N Adjustment Of The Thread Tension Releasing
HOW TO USE N Adjustment of the thread tension releasing ( 1 ) Turn the pulley and stop it at the position where the needle comes to the lowest. ( 2 ) Put the cam roller into the thread trimmer cam groove by pushing the cam follower crank. ( 3 ) Turning the pulley, adjust the thread tension releasing cam so that the thread tension disc closes when the white mark point on the pulley comes in line with the black mark point on the arm. To adjust, loosen two thread tension releasing cam clamp screws Ⓐ. ( 4 ) The opening amount of the thread tension disc should be adjusted with the thread tension releasing roller Ⓑ mounted on the convex portion of the thread tension releasing cam, as shown in the figure. To adjust, loosen screws Ⓒ and pull the wire. ( 5 ) Make fine adjustments by loosening the nut Ⓓ. ( 6 ) Loosen the nut Ⓓ and make the outer casing approach to the right to increase the opening amount. White mark point Pulley Cam follower crank Thread tension releasing lever Screw Ⓐ Cam roller Outer casing Roller Ⓑ... -
Page 21: O Adjustment Of Meshing Pressure Between The Movable Knife And The Fixed Knife
HOW TO USE O Adjustment of meshing pressure between the movable knife and the fixed knife ( 1 ) Loosen the fixed knife bracket clamp bolt Ⓐ. ( 2 ) Adjust meshing pressure by turning the up and down adjusting screw Ⓑ, and tighten the bolt Ⓐ. Note: Since overpressure causes a large torque on the thread trimmer mechanism and trimming failure, adjust so that the thread can be trimmed with the minimum pressure. ( 3 ) Move the movable knife and check that the thread can be sharply trimmed. Fixed knife bracket Bolt Ⓐ Screw Ⓑ P Sharpening of the fixed knife If the fixed knife is dull, it should be sharpened as shown in the figure. Since it is very difficult to sharpen the movable knife, replace it with a new one when it dulls. Oil stone Fixed knife 60° — 18 —... -
Page 22: Q Adjustment Of The Thread Trimmer With Changing The Width Between Needles
HOW TO USE Q Adjustment of the thread trimmer with changing the width between needles ( 1 ) Replace the throat plate, the feed dog, the needle clamp, and the presser foot. When the width between needles is 1/2 inches or more, replace the thread guide too. (Since the throat plate and the feed dog are special parts designed for the thread trimming machine, be sure to use those specified by us.) Note: When the width between needles is 3/4 inches or more, replace the pitman rod Ⓛ. ( 2 ) Lean the machine head backward. Cam follower crank Ⓚ ( 3 ) Loosen two link clamp bolts Ⓙ. ( 4 ) Remove the spring Ⓜ. Cam roller Thread trimmer cam ( 5 ) Loosen hook saddle clamp screws Ⓐ and Ⓑ, and adjust the gap between the needle and Lower shaft the hook. ( 6 ) After adjusting the needle and the hook, install the spring Ⓜ. -
Page 23: R Installation Of The Solenoid Arm
HOW TO USE R Installation of the solenoid arm Rotary solenoid ( 1 ) Install the rotary solenoid so that the gap 0 to 0.5㎜ between the rotary solenoid and the solenoid arm is about 0 to 0.5mm. Note: If the gap is too large, the roller and Roller the cam follower crank interfere while rotating movement of the solenoid, which causes malfunction and result in Solenoid arm Cam follower failure of the thread trimmer device. crank S Removal procedure of the hook Lever ( 1 ) Loosen three set screws of the small gear to the hook shaft. Knife bracket ( 2 ) Remove the opener. Movable knife ( 3 ) Remove the fixed knife. ( 4 ) Move the lever to the arrow direction, and Bobbin thread ... -
Page 24: Specifications
SPECIFICATIONS LU2-4410-B1T-CS・LU2-4430-B1T Specifications Model LU2-4410-B1T-CS LU2-4430-B1T Specifications Number of needles Single-Needle Double-Needle Heavy material Application Automotive seat (Heavy material) Max. sewing speed (rpm) 2000 Stitch length (mm) 0 to 9 Hand Presser foot stroke (mm) Knee Needle DP × 17 #21 DP × 17 #23 Needle bar stroke (mm) 35.0 36.0 Thread take-up lever stroke (mm) 70.0 74.5 Vertical stroke of upper feed (mm) 2.0 to 6.0 Thread trimmer ○ Touch back ○ Hook (horizontal rotating hook) Large Bobbin Made of aluminum for thread trimmer Lubrication system Automatic lubrication... - Page 28 Printed in Japan...
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