Mitsubishi Electric LU2-4400-B0B Instruction Manual Download Page 8 | Manualshive

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HOW TO USE

5

Adjustment of feed (stitch)

length and backstitch

● Adjustment of feed (stitch) length…Adjust feed

length by turning the feed length setting dial
while depressing the reverse sewing lever.

● Backstitch…Direction of stitching can be

reversed by depressing the reverse sewing
lever.

6

Setting of bobbins

( 1 ) Pull out 5cm thread tail from bobbins.
( 2 ) Put bobbins into hooks in the direction as the

following figure.

Feed length setting dial

Reverse sewing lever

Bed slide

Hook

Bed slide

Thread

Hook

— 5 —

From the library of Superior Sewing Machine & Supply LLC - www.supsew.com

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Summary of Contents for LU2-4400-B0B

Page 1: ...A180E269P02 LOCKSTITCH COMPOUND FEED INDUSTRIAL SEWING MACHINES INSTRUCTION MANUAL LU2 4400 B0B Single Needle LU2 4420 B0B Double Needle MODEL ...

Page 2: ...an oil sump never operate the machine without filling oil in it 2 If the machine is lubricated by a drop oiler never operate the machine without lubricating 3 When a new sewing machine is operated verify the rotational direction of the pulley with the power on The pulley should rotate counterclockwise when viewed from the pulley 4 Verify voltage and single or three phase indicated on the nameplate...

Page 3: ...eads tension 6 Adjustment of needle threads tension 6 A Adjustment of the presser foot pressure 6 B Timing between the rotating hook motion and the needle motion 7 C Adjustment of the feed dog height 8 D Relationship between the rotating hook motion and the thread take up lever motion 9 E Relationship between the rotating hook motion and the opener motion 9 F Relationship between the needle motion...

Page 4: ... Refer MC70M Specific gravity 15 0 86 g cm3 Viscosity 40 10 9 mm2 s 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 USAGE PRECAUTION Oil level mark 1 From the library of Superior Sewing Machine Supply LLC www sups...

Page 5: ...nstall 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 2 It should be noted that the brake may not work when the power is interrupted or power failure occurs during sewing machine operation 3 Since dust in the control box might cause malfunction or control troubles be sure to keep the control box cover close d...

Page 6: ... Amount of wound thread Loosen the winding amount adjustment screw to decrease thread winding amount and tighten the screw to increase thread winding amount Winding tension adjustment nut Even winding amount of 80 of full capacity Winding amount adjustment screw Thread guide Double Needle Insert the needle upto the bottom of needle clamp and tighten the screw keeping the long groove side of needle...

Page 7: ...nt 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 LU2 4400 LU2 4400 Needle part LU2 4420 LU2 4420 LU2 4400 refer to the only left thread to to Detail L12 L14 R10 R12 to Detail L12 L14 Lead the thread leftward Lead the thread rightward See detailed...

Page 8: ...sewing lever Backstitch Direction of stitching can be reversed by depressing the reverse sewing lever 6 Setting of bobbins 1 Pull out 5cm thread tail from bobbins 2 Put bobbins into hooks in the direction as the following figure Feed length setting dial Reverse sewing lever Bed slide Hook Bed slide Thread Hook 5 From the library of Superior Sewing Machine Supply LLC www supsew com ...

Page 9: ...n threads tension Adjust needle threads tension by turning thread tension nuts Needle threads tension can be also adjusted by changing intensity and movable range of the thread take up spring in case of sewing the special fabric and thread A Adjustment of the presser foot pressure Adjust the presser foot pressure according to the fabric by turning the pressure adjusting screw HOW TO USE A B C Bala...

Page 10: ... is 0 05mm or lower 5 Tighten screws Ⓐ Ⓑ Note Be careful not to overtighten screws Ⓑ 6 Slide the large gear right and left so that the tip of the hook position is in the center of the needle and tighten screws Ⓒ Note Check the large gear and the hook saddle isn t in contact and its distance is less than 3mm 7 Move the tip of the hook to the needle side by turning the pulley 8 Return the machine he...

Page 11: ...here 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 12: ...f the timing mark is not in line with the black line remove the timing belt and install it again to adjust E Relationship between the rotating hook motion and the opener motion 1 Turn the pulley by your hand and stop it at the position where the opener holder is located most remotely from the throat plate 2 Check that the gap between the lug Ⓐ and the opener is approximately 0 2mm 3 If the gap is ...

Page 13: ...ank right is connected with the link at a right angle as shown in the figure 7 If the connection is not a right angle remove the Rear cover loosen screw Ⓒ and move the link to connect the feed rock shaft crank right with the link at a right angle 8 After adjusting fully tighten all screws Ⓐ Ⓑ Ⓒ At this time check that the needle enters the hole at center of the feed dog HOW TO USE Link Needle bar ...

Page 14: ... left hand turn the pulley slowly with your right hand away from you as shown in the figure 2 The pulley will be stopped by the gear plate but turn the pulley more firmly 3 Release the pushbutton 4 The clutch device will be set as shown in the figure 3 Force applied to the safety clutch 1 The force applied to the safety clutch is the smallest when the white mark of the eccentric pin faces the cent...

Page 15: ...just in the range where the mark point of the eccentric pin is facing to the reverse block side as shown in the figure J Adjustment of the outside presser foot and the inside presser foot 1 Adjustment of working height of the outside presser foot and the inside presser foot Please adjust working height of the presser foot when sewing the fabric having large elasticity or varying the thickness of t...

Page 16: ...f the inside presser foot decreases and it of the outside presser foot increases 6 After adjusting fully tighten the screw Ⓐ The up and down movement of the inside presser foot and it of the outside presser foot are factory adjusted to 3mm and 4 2mm 3 How to install the eccentric cam 1 Turn the pulley and stop it at the position where the thread take up lever comes to the lowest 2 In this conditio...

Page 17: ...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 Needle gauge mm Standard 6 4 Special 3 2 4 4 8 8 9 5 12 7 16 19 25 4 Note The bobbin should be of high quality free from deformation Some materials gauge sizes and or sewing conditions may require specifications other than those listed above The...

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 ...

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