Related Manuals for Mitsubishi Electric LU2-4652-B1T
Summary of Contents for Mitsubishi Electric LU2-4652-B1T
- Page 1 SINGLE-NEEDLE LOCKSTITCH COMPOUND-FEED AUTOMATIC UNDERTRIMMER INDUSTRIAL SEWING MACHINES MODEL LU2-4652-B1T INSTRUCTION MANUAL A180E557P02...
- 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.
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Page 3: Table Of Contents
CONTENTS PREPARATION FOR OPERATION ……………………………………………… 1 1 Installing the air cylinder assembly ……………………………………………… 1 2 Connecting the electric cables to the control box ……………………………… 1 3 Adjustment of the stitch length before trimming ……………………………… 3 4 Operation speed adjustment of instant alternating air cylinder ……………… 4 5 Height adjustment of the automatic presser foot lifter ………………………… 4 6 Adjustment of the needle stopping position … …………………………………… 5 USAGE PRECAUTION ……………………………………………… 6 1 Lubrication ( 1 ) ……………………………………………………………………… 6 2 Lubrication ( 2 ) ………………………………………………………………………... -
Page 4: Installing The Air Cylinder Assembly
PREPARATION FOR OPERATION 1 Installing the air cylinder assembly ( 1 ) Align the air cylinder assembly to the back of the arm as shown below and then fit the driving link into the pin. Fit a driving link between the nylon washers. ( 2 ) Install the air cylinder assembly on the back of the arm. Tighten the bracket and the back of the arm with the enclosed bolt. Back of the arm Bolt Bracket Air cylinder assembly Nylon washer Driving link 2 Connecting the electric cables to the control box Connect wires and pipes as follows. ( 1 ) Install the solenoid valve and the filter regulator assembly ① within the reach of the urethane tube /cord under the table. - Page 5 PREPARATION FOR OPERATION ( 8 ) C onnect by urethane tube between the upper part elbow unions ⑪ installed on the air cylinder assembly and port A of the solenoid valve assembly ⑬. Similarly, connect the urethane tube between lower side of elbow unions ⑫ and port B of the solenoid valve assembly. ( 9 ) C onnect the air supply source to the IN port of the filter regulator ①. (10) Tie together urethane tubes and cords with attached binding bands. Note: Set the standard air pressure of the regulator to 0.4 MPa (4 kgf/cm Air cylinder assembly ⑪ ② ③ ⑫ ④ B port ⑬ B port ⑥ ① Urethane tube ⑬ A port ④ A port ⑤ ⑦ A port ⑨ ⑧ IN port to the air supply source Knee switch LF-FM-CFT ⑩...
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Page 6: Adjustment Of The Stitch Length Before Trimming
PREPARATION FOR OPERATION 3 Adjustment of the stitch length before trimming Depending on sewing conditions, the stitch immediately before trimming may not be formed correctly. This may cause the trimmed tail length to be long. In this case, adjust the length of the stitch immediately before the trimming position to ensure that a proper stitch is formed. As reference, the standard stitch length is 1 to 2 mm. The length of the stitch immediately before trimming can be adjusted by moving the position of the knuckle to the air cylinder shaft up/down. Adjust with the following methods. ( 1 ) Loosen the nut on the knuckle. ( 2 ) Rotate the air cylinder shaft. Adjust the position of the knuckle to the air cylinder shaft. ( 3 ) The stitch immediately before trimming is as follows. ・During forward stitching: Looking from above, turn the shaft clockwise to change to reverse stitching. ・Too short during reverse stitching: Looking from above, turn the shaft Shaft clockwise. ・Too long during reverse stitching: Looking from above, turn the shaft counterclockwise. -
Page 7: Operation Speed Adjustment Of Instant Alternating Air Cylinder
PREPARATION FOR OPERATION 4 Operation speed adjustment of instant alternating air cylinder ( 1 ) To adjust the speed of the air cylinder at the maximum instant alternating, adjust the handle ① with plated locknut on the dual speed controller of the instant alternating solenoid valve (lower side). ( 2 ) To adjust the speed of the air cylinder at the instant alternating return, adjust the handle ② with the black colored locknut on the dual speed controller of the instant alternating solenoid valve (lower side). ① ② 5 Height adjustment of the automatic presser foot lifter Back of the arm The presser foot lifter height at the automatic presser Stopper can be adjusted. ( 1 ) Remove the top cover. ( 2 ) Slide the stopper plate on the presser foot lifter air cylinder up and down to adjust. -
Page 8: Adjustment Of The Needle Stopping Position
PREPARATION FOR OPERATION 6 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 3 mm, adjust as follows. ( 1 ) Disconnect the plug (12 pins) 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”... -
Page 9: 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 — 6 —... -
Page 10: 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. Adjusting screw Decrease Increase 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 11: How To Use
HOW TO USE 1 Installation of the needle Note: Before installing the needles, be sure to turn off the power. 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 12: 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 the needle thread 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 13: 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 ● B ackstitch…Direction of stitching can be length by turning the feed length setting dial reversed by depressing the reverse sewing while pushing PUSH lever. lever or pushing the touch back switch. Note: D epending upon the stitch length, the maximum sewing speeds are different. With referring to the specifications on page 25, please operate the sewing machine at the speed less than the matching sewing speed with the stitch length. Feed length setting dial Touch back switch Reverse sewing lever 6 Setting of the bobbin 7 Adjustment of the needle thread guide ( 1 ) Pull out 5 cm thread tail from the bobbin. -
Page 14: Threading Of The Bobbin Thread
HOW TO USE 8 Threading of the bobbin thread : 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 ② Opener A Adjustment of the needle thread tension ( 2 ) While holding two needle threads with your To adjust needle thread tension, turn the thread left hand, turn the pulley one rotation with tension nut. -
Page 15: C Adjustment Of The Outside Presser Foot And Inside Presser Foot
HOW TO USE C Adjustment of the outside presser 3 . How to install the upper eccentric feed lifting cam foot and inside presser foot ( 1 ) Turn the pulley and stop it at the position where the thread take-up lever comes to the lowest. 1 . Adjustment of alternating movement ( 2 ) In this condition, remove the rubber plug ( 1 ) The alternating movement on the outside located on the arm. Locate the second screw presser foot and inside presser foot can be... -
Page 16: D Instant Alternating Switch
HOW TO USE D Instant alternating switch Alternating stroke adjusting dial Stopper screw During the sewing operation, if a sewing material has a step, hit the instant alternating switch, then the alternating up and down movement instantly becomes much bigger to get over the step. Hit once, ON The alternating up and down movement becomes highest (It is adjusted 6 mm is (Lighting LED lamp) Instant alternating switch the highest when the sewing machine is shipped from the factory). Hit twice, OFF The alternating up and down movement becomes the normal stroke controlled with the alternating stroke adjusting dial. Note 1: T he knee switch also can be used as the instant alternating switch. 2: I t also can be set the alternating up and down movement to the highest only while pressing the instant alternating switch. -
Page 17: F Installing The Feed Regulator Bracket
HOW TO USE F Installing the feed regulator bracket If it is necessary to dismount and reassemble the feed regulator bracket and its related parts, install Ⓒ Feed regulator shaft it as follows. Note: I f the feed regulator bracket is poorly positioned, the resultant alternating 42.6 mm movements may be too short or long causing defective machine operation. Ⓑ ( 1 ) Set the gap between special screw Ⓐ located on the regulator shaft and the side wall of Feed regulator bracket Ⓐ 2.3 mm the machine arm to 42.6 mm as illustrated to the left. (Use a 42.6 mm spacer between these parts. This facilitates the operation.) ( 2 ) With the feed regulator stud held as explained Feed lifting rock shaft crank (right) in step ( 1 ) above, adjust the feed regulator bracket. This adjustment should insure a gap of 2.3 mm between the periphery of pin Ⓑ... -
Page 18: H Timing Between The Rotating Hook Motion And The Needle Motion
HOW TO USE H Timing between the rotating hook motion and the needle motion Screw Ⓐ Note: I f you remove the presser foot, the throat plate, and the feed dog, it makes easier to Screw Ⓑ adjust. ( 1 ) Set feed length to 6 mm. ( 2 ) Loosen all screws Ⓐ, Ⓑ, Ⓒ. Note: B e careful not to disengage the large gear and the small gear. Screw Ⓒ ( 3 ) Lift the needle bar 2.4 mm from the lowest position. Refer to timing marks shown in the （a）Position of the needle bar: ... -
Page 19: I Adjustment Of The Feed Dog Height
HOW TO USE I 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. 1.0 mm ◆ 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 20: J Relationship Between The Rotating Hook Motion And The Thread Take-Up Lever Motion
HOW TO USE J Relationship between the rotating hook motion and the thread take-up Black line on boss of lower shaft bearing 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 black line, remove the timing belt and install Timing belt pulley it again to adjust. -
Page 21: L Relationship Between The Needle Motion And The Feed Dog Motion
HOW TO USE L Relationship between the needle motion and the feed Feed rock shaft crank(middle) 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. Ⓑ Screw ( 3 ) Lean the machine head backward. Link ( 4 ) Loosen the feed rock shaft crank set screws Ⓐ, Ⓑ. -
Page 22: M Safety Clutch
HOW TO USE M 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 23: N Adjustment Of Upper Feed Length (Needle Side)
HOW TO USE N Adjustment of upper feed Upper feed length (needle side) increases If uneven feeding occurs according to the fabric, Special bolt adjust the long hole of the feed rock shaft crank (right) to adjust the upper feed length. Link Reference (How to adjust) line ( 1 ) Loosen the special bolt. Upper feed ( 2 ) Move the special bolt upward to decrease the upper feed. decreases ( 3 ) Move the special bolt downward to increase the upper Feed rock shaft feed. (The upper feed and the lower feed theoretically crank(right) 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 24: P Installation Of The Movable Knife
HOW TO USE P 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 bolt Ⓐ. ( 5 ) Adjust so that the tip of the movable knife is hidden 0 to 0.5 mm in the fixed knife, as shown in the figure and tighten bolt Ⓐ. -
Page 25: Q Installation Position Of The Thread Trimmer Cam
HOW TO USE Q Installation position of the thread trimmer cam ( 1 ) Adjust so that the gap between the feed cam and the bushing is 17.3 mm 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 trimmer cam (making the gap between each Thread tension releasing cam part zero), then tighten each screw. Bushing Screw Ⓐ Feed connecting rod 17.3mm Feed cam Thread trimmer cam R Adjustment of the thread trimmer cam ( 1 ) Turn the pulley and stop it at the position where the needle comes to the lowest. -
Page 26: S Adjustment Of The Thread Tension Releasing
HOW TO USE S 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 Cam follower crank Thread tension ... -
Page 27: T Adjustment Of Meshing Pressure Between The Movable Knife And The Fixed Knife
HOW TO USE T 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 Ⓑ Hook saddle U Sharpening of the fixed knife If the fixed knife is dull, it should be sharpened as shown in the figure. -
Page 28: Specifications
SPECIFICATIONS LU2-4652-B1T Specifications Model LU2-4652-B1T Specifications Number of needles Single-Needle Heavy material Application (rpm) Alternating movement Stitch length 3000 0 to 6 Max. sewing speed 2700 0 to 6 2000 5 to 6 6 to 8 Stitch length (mm) 0 to 8 Hand Presser foot stroke (mm) Knee Needle DP × 17 #21 Needle bar stroke (mm) 35.0 Thread take-up lever stroke (mm) 71.0 Movement (mm) 2.0 to 6.0 Alternating Stroke adjustment Dial Instant adjustment Air cylinder Thread trimmer ○... - Page 32 Printed in Japan...