Related Manuals for Mitsubishi Electric LT2-2220-B0B
Summary of Contents for Mitsubishi Electric LT2-2220-B0B
- Page 1 DOUBLE-NEEDLE LOCKSTITCH NEEDLE-FEED INDUSTRIAL SEWING MACHINE MODEL LT2-2220-B0B INSTRUCTION MANUAL A180E126P03...
- 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 USAGE PRECAUTION ……………………………………………… 1 1 Lubrication (1) ………………………………………………………………………… 1 2 Lubrication (2) ………………………………………………………………………… 1 3 Lubrication condition and adjustment on lubrication to the thread take up lever … 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 ……………………………………………………………… 4 4 Threading of needle threads ………………………………………………………... -
Page 4: Usage Precaution
USAGE PRECAUTION 1 Lubrication (1) Fill the oil reservoir with oil up to “H” mark. Oil level should be periodically checked. If oil level is found below “L” level replenish oil to “H” level. For oil, use “MC70M” specified by Mitsubishi. ※ Refer MC70M ： Specific gravity (15℃ ) = 0.86 (g/cm ：Viscosity (40℃ ) = 10.9 (mm Oil level mark 2 Lubrication (2) When a new sewing machine is used for the first time, or sewing machine left out of use for considerably long time is used again, replenish a suitable amount of oil to the portions indicated by arrows in the below figure. Amount of oil…… 5, 6 drops From the library of Superior Sewing Machine & Supply LLC - www.supsew.com —... -
Page 5: Lubrication Condition And Adjustment On Lubrication To The Thread Take Up Lever
USAGE PRECAUTION 3 Lubrication condition and 4 Adjustment of lubrication to the adjustment on lubrication to rotating hook the thread take up lever ( 1 ) See dripping of oil through the oil sight window to check oiling condition during operation. ( 2 ) Adjust lubrication quantity to the thread take up lever mechanism by turning the lubrication adjustment screw. Increase Decrease Adjusting Decrease Increase screw Oil sight window lubrication ... -
Page 6: How To Use
HOW TO USE 1 Installation of needles Note: Before installing the needles, be sure to turn off the power. 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 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 HOW TO USE 3 . If the strong twisted thread (nylon or Tetron, etc.) is used and needle threads tension is strong (about 500gf or more), the right thread may be released from the thread tension disc. In this case, thread only the right thread as shown in the figure (keep the left thread standard). Needle thread (right) From the library of Superior Sewing Machine & Supply LLC - www.supsew.com — 5 —...
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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 depressing the reverse sewing lever. ● B ackstitch…Direction of stitching can be reversed by depressing the reverse sewing Reverse sewing lever lever. 6 Adjustment of the needle 7 Setting of bobbins thread guide ( 1 ) Pull out 5 cm thread tail from bobbins. ( 2 ) Put bobbins into hooks in the direction as the Adjust the needle thread guide of the needle following figure. -
Page 10: Threading Of Bobbin Threads
HOW TO USE 8 Threading of bobbin threads : Adjustment of needle threads tension ( 1 ) Put bobbin thread into the slit ①, pass under Adjust needle threads tension by turning thread the lug ② and extend it above the bed. tension nuts. Thread Pre-tension nut ① Tighten Loosen Tighten Loosen Thread tension nut Thread A Adjustment of the thread take up spring ② Opener 1 . -
Page 11: B Timing Between The Rotating Hook Motion And The Needle Motion
HOW TO USE B Timing between the rotating hook motion and the needle motion Small gear Adjust right and left timing in the same way at the same time. Screw Ⓐ Note: If you remove the presser foot, the throat plate, and the feed dog, it makes easier to Large gear adjust. Set Screw Ⓓ ( 1 ) Set feed length to 4.5 mm. Figure seen from the arrow direction ( 2 ) Loosen all screws Ⓐ, Ⓑ, Ⓒ, Ⓓ, and slide each Set Screw Ⓒ hook saddle to outside. Note: At this time, don’t loosen the set screw Screw Ⓑ Ⓒ too much. ( 3 ) Check that the first screw of the large gear 0.05 mm or lower enters a notch, and set the needle bar at the lowest position. -
Page 12: C Adjustment Of The Presser Foot Pressure
HOW TO USE ● Adjustment of the needle up and down position When the needle is lifted 2.4 mm from the lowest position, adjust the needle position so that the gap between the top of needle eye and the tip of the hook is 1.0 to 2.0 mm. ( 1 ) Remove the face plate, loosen the needle bar clamp screw, and vertically move the needle Needle bar bar to adjust. ( 2 ) After adjustment, fully tighten the screw. Needle bar clamp Screw C Adjustment of the presser foot pressure Pressure adjusting screw ( 1 ) Adjust the presser foot pressure by loosening the nut and turning the pressure adjusting screw. -
Page 13: D Adjustment Of The Feed Dog Height
HOW TO USE D 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. 1.2 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 14: E Relationship Between The Rotating Hook Motion And The Thread Take-Up Lever Motion
HOW TO USE E Relationship between the rotating hook motion and the thread take-up lever motion When the timing belt is removed for replacement, etc., the relation between the rotating hook motion Black line on boss of lower shaft bearing and the thread take-up lever motion should be adjusted as follows: Timing belt ( 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 it again to adjust. -
Page 15: G Relationship Between The Needle Motion And The Feed Dog Motion
HOW TO USE G Relationship between the needle motion and the feed Feed rock shaft crank(middle) dog motion Feed rock shaft crank(right) Link ( 1 ) Set the stitch length to “0” on the feed length Ⓐ Screw setting dial. ( 2 ) Set the needle at the lowest position. Ⓑ Screw ( 3 ) Lean the machine head backward. Needle bar rock ( 4 ) Loosen the feed rock shaft crank set screws Ⓐ, shaft crank Ⓑ. -
Page 16: H Installation Position Of The Feed Cam
HOW TO USE H Installation position of the feed cam ( 1 ) Set the feed length setting dial to maximum. Forward stitch ( 2 ) Turn the pulley and stop it at the position Feed length setting dial where the red mark point on the pulley meets the black mark point on the arm. ( 3 ) Move the feed cam to the position shown in the figure, and repeat the forward stitch and Backward stitch the backward stitch. Reverse sewing lever At this time, set the feed cam to the lower shaft at the position where the needle (feed dog) stops. Red mark point Pulley Feed cam Feed connecting rod Set screw Black mark point I Adjustment of forward/ backward feed length Reverse stitch ... -
Page 17: Specifications
SPECIFICATIONS LT2-2220-B0B Specifications Model LT2-2220-B0B Specifications Application Medium-heavy material Max. sewing speed (rpm) 3,000 Stitch length (mm) 0 to 7 Needle bar stroke (mm) 35.0 Thread take-up lever stroke (mm) 64.5 Hand 7.0 Presser foot stroke (mm) Knee 13.0 Needle DP × 5 #18 Hook (horizontal rotating hook) Large Lubrication system Automatic lubrication Bed dimensions (mm) 517 × 178 Standard 6.4 Needle gauge (mm) Special 3.2、4.8、8、9.5、12.7 Note: ● T he bobbin should be of high quality free from deformation. ● S ome materials, gauge sizes, and/or sewing conditions may require specifications other than those listed above. - 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 Printed in Japan From the library of Superior Sewing Machine & Supply LLC - www.supsew.com...