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40033638

No.E368-00

ENGINEER’S MANUAL

HIGH SPEED SEMI-DRY HEAD OVERLOCK/INTERLOCK/
SEWING MACHINE

MO-6700D Series

Summary of Contents for MO-6700D Series

Page 1: ...40033638 No E368 00 ENGINEER S MANUAL HIGH SPEED SEMI DRY HEAD OVERLOCK INTERLOCK SEWING MACHINE MO 6700D Series...

Page 2: ...advisable to use the relevant Instruction Manual and Parts List together with this Engineer s Manual when carrying out the maintenance of these machines In addition for the motor for the sewing machi...

Page 3: ...rd 18 1 For 1 needle or 2 needle overlock machine 18 2 For safely stitch machine 18 11 Adjusting the height of the feed dog 20 12 Adjusting the tilt of the feed dog 20 13 Adjusting the differential fe...

Page 4: ...of the upper looper holder 41 4 Caution in assembly 41 1 Application of sealant 41 2 Precautions to be taken with respect to the lubricating components 43 3 Applying the exclusive grease 44 5 Kinds o...

Page 5: ...ium to heavy weight materials 10 Needle tilt angle 20 11 Needle bar mechanism Upper and lower needle bar bushing type 12 Needle ORGAN DC X 27 Standard DC X 1 can be used as well 13 Presser lifting amo...

Page 6: ...m 2 3 2 2 0mm 9 Overedging width classification A 1 6mm B 2 0mm D 3 2mm E 4 0mm F 4 8mm H 6 4mm 10 Feed dog classification 4 2 row 5 1 row 6 3 row 11 Material classification classification applied to...

Page 7: ...ng for sharp curve tape guide L121 Blind stitch hemming attachment S159 Swing type gathering device interlocked with pedal for safety stitch machine S162 Swing type gathering device manual lever opera...

Page 8: ...height from the throat plate surface should be as shown below 3 STANDARD ADJUSTMENT 1 Adjusting the needle height The needle entry point should be such that the distances listed below are provided bet...

Page 9: ...n tighten the setscrew to fix the forked crank at that position o Any other needle height than specified here will badly affect the action of the lower looper the timing for catching the upper looper...

Page 10: ...Adjusting the length of the lower looper holder Applicable only to MO 6716D series The center to center distance should be 26 mm At this time the clearance between the end surface of the arm and the n...

Page 11: ...needle and the looper is insufficient the needle will break or the looper blade point will be damaged causing thread breakage 1 Loosen setscrew of the lower looper holder from the rear of the frame S...

Page 12: ...210 4 0 MO 6704D 0 300 3 8 MO 6704D 0 307 3 8 MO 6704D 0 40H 3 8 MO 6704D 0F6 50H 3 8 MO 6714D B 7 3 8 MO 6714D B H 4 0 MO 6712D DF6 50 2 2 MO 6714D B 30P 3 8 MO 6716D 300 3 8 MO 6716D FF6 307 3 8 MO...

Page 13: ...wer looper support arm and adjust lower looper to make adjustment of the returning amount Referential information 1 Radius K of lower looper will be 66 9 mm when the lower looper is inserted into lowe...

Page 14: ...surface Laternal position To be pressed against the upper looper guide support gauge 13131909 13132006 Model Dimension G MO 6714D 4 H Unit mm Unit mm Model Dimension G Unit mm 7 5 5 6 6 3 4 7 5 8 5 8...

Page 15: ...ping the upper looper guide support into close con tact with the frame guide surface then tighten the screws Caution Refer to 4 4 1 7Various sealants for the various sealants o If the upper looper gui...

Page 16: ...imension F The distance between the bottom surface of the frame and the upper end of the upper looper holder pin should be as shown below when the upper looper holder is at the highest point of its st...

Page 17: ...the top surface of upper looper holder pin before tightening the setscrew of upper looper ball arm Caution Replace upper looper holder according to the needle gauge size o Inaccurately positioned upp...

Page 18: ...nce between upper looper and needle should be 0 01 to 0 2 mm D 0 05 to 0 2 mm 0 01 to 0 2 mm Model Dimension D Dimension E MO 6704D 0A 150 11 0 4 0 MO 6705D 0 210 11 0 4 0 MO 6704D 0 300 11 0 4 0 MO 6...

Page 19: ...eir crossing or the clearance of 0 01 to 0 2 mm between upper looper and needle o If the upper looper has been positioned too high an excessive clearance will be produced between the upper looper and...

Page 20: ...of its travel 2 Longitudinal motion Avoid motion The standard minor axis of the elliptical motion should be 3 0 mm Note The avoid motion should be adjusted in accordance with Needle No 3 Clearance bet...

Page 21: ...adjust the longitudinal position of the double chain looper Adjust the clearance to 0 05 to 0 1 mm o Excessive return of the double chain looper will cause frequent stitch skipping when filament threa...

Page 22: ...or safely stitch machine The safely stitch machine has four needle guards A B C and D The needle guards A and B are positioned in the same manner as those for the overlock machine The needle guard C s...

Page 23: ...point breakage or other troubles o If the needle guard B is too high thread loops will be damaged with resultant stitch skipping Also double chain loops will be affected causing double chain stitch sk...

Page 24: ...0 mm Model Dimension A MO 6700D series 30P excluded 1 0 MO 67 D 30P 0 8 12 Adjusting the tilt of the feed dog Tilt of the feed dogs when the feed dogs have come up most Model Dimension A Dimension B...

Page 25: ...hen tilted with the front up Good material catching will be obtained o When tilted with the front down Uneven feed and puckering will be effectively prevented 1 Use the tilt of the feed dog when it is...

Page 26: ...highest position Washer Pin at its lowest position 14 Longitudinal position of the feed dog When the feed pitch is maximized and the differential feed ratio is also maximized the clearances of the fro...

Page 27: ...feed pin and nut and install cover o If the clearance provided between the throat plate and the feed dog is too small they will come in contact with each other when the sewing machine runs at high spe...

Page 28: ...presser foot should be positioned so that the feed dogs go down under the specified presser foot pressure and the presser foot sole comes in contact evenly with the throat plate surface 2 Adjusting th...

Page 29: ...tact evenly with the throat plate top surface Then tighten set screw Reference Accurate adjustment can be made by using two pieces of thin paper to check for even drawing out tension In addition even...

Page 30: ...the upper knife arm shaft 17 Positioning the upper and lower knives and available overedge widths The upper knife shaft should be positioned 34 mm above the top surface of the throat plate when it is...

Page 31: ...positioned and fixed at a position where it has settled by itself un der the upper knife spring 1 Lower knife 1Adjust the vertical position of the lower knife by screw so that the blade top aligns wit...

Page 32: ...Position of the thread cam Applicable only to MO 6716D series 1 Adjustment of the thread cam 2 Adjusting looper thread cam thread guides A and B and the looper thread cam nail 10 55 Standard Adjustme...

Page 33: ...ceeded the durability of the knife will be deteriorated often resulting in blade chipping o If the angle is smaller than 10 the knife will be dull o If the 55 angle is not observed the knife may catch...

Page 34: ...iary thread take up lever Exclusive for 30P When lopper thread auxiliary thread take up lever is in its lower dead point the thred hole should align with the hole in lopper thread auxiliary thread tak...

Page 35: ...rew so that the thread hole in looper thread auxiliary thread take up lever aligns with the thread hole in looper thread auxiliary thread take up lever guide Caution 1 When the feed pitch is changed p...

Page 36: ...32 20 Adjusting the throat plate support 21 Adjusting the feed mechanism cover presser Standard Adjustment Standard Adjustment Uniform contact...

Page 37: ...throat plate using setscrews o If the feed mechanism cover is not fully pressed and the cover rises oil leakage will be caused 1 Loosen setscrew and press feed mechanism cover presser in the directio...

Page 38: ...cover with upper knife in its lowest position of its troke 23 Adjusting the cloth chip cover o When cloth chip cover is pressed away from you it should not rattle In addition the cloth chip cover sho...

Page 39: ...rily tighten the setscrew with cloth chip cover stopper raised 2 Loosen setscrews in the cloth chip cover and adjust the longitudi nal position of cloth chip cover 3 Loosen setscrew in the cloth chip...

Page 40: ...e and the hooked portion of the needle thread take up are in the position where the entire hole in the needle thread guide can be observed The thread hole in the needle thread guide and the hooked por...

Page 41: ...ed When set larger loose needle thread stitches will result o Distance E F and H exert least influence on stitch formation however improper setting of these distances will cause con tact between the m...

Page 42: ...int of its stroke 04 1 needle overlock machine 16 Safely stitch machine 2Adjust the rising amount of needle thread presser plate C Adjust the rising amount of needle thread presser plate C to 0 6 to 1...

Page 43: ...th better appearance and touch 1 If the knotting point varies at high or low sewing speed slightly reduce L and increase the lower looper thread tension 2 If a knot is made at a high point increase J...

Page 44: ...MO 6714D series 1217 60 Part No Color Natural length Operating length Weight required to compress mm mm spring to working length 13137807 Red 19 5mm 11 5mm 4 21 0 49N 430 50g 13138508 Yellow 17 8mm 9...

Page 45: ...ttom surface of the upper looper guide support Three bond 1104 Apply the sealant to the bottom surface of the upper looper guide support which contacts with the frame surface 3 After assembling the fr...

Page 46: ...ve 3 kinds of the sealants are not set 4 Portion of the setscrews of the dust proof rubber case JUKI seal Apply the sealant to the oil shield case setscrew 1 pc and the dust proof rubber case setscrew...

Page 47: ...on room Wet portion 3 Upper looper mechanism portion Dry portion 1 Needle bar mechanism portion Dry portion 2 Feed mechanism portion Wet portion o Assemble the feed bar presser and the dust proof rubb...

Page 48: ...when the sewing machine is used under the normal condition When the machine is used under the specially severe condition it is effective to periodically once a year or every other year fill up the ex...

Page 49: ...45 2 Upper looper components...

Page 50: ...0 100 95 914 36 813 32 85 80 889 35 762 30 5000 90 85 889 35 762 30 80 75 864 34 762 30 4500 85 80 889 35 762 30 70 65 864 34 762 30 4000 75 70 864 34 762 30 60 55 864 34 737 29 Sewing speed of sewing...

Page 51: ...B 39 2 2 0 3 66 9 10 5 0 1 11 0 0 3 4 0 0 3 46 2 A 38 3 7 66 9 1 5 to 2 0 63 4 1 3 0 1 11 3 0 3 4 4 0 3 48 2 A 39 3 8 66 9 1 5 to 2 0 63 4 11 3 0 1 9 9 11 0 0 3 4 8 0 3 48 4 A 39 3 8 66 9 1 5 to 2 0...

Page 52: ...e of materials number of plies and speed Use the needle cooler Use an S point sewing speed and causes the thread to needle or needle for synthetic thread burn and break Thread The thread is weak becau...

Page 53: ...taking balance is disturbed resulting in the thread breakage Double chain looper avoid The double chain looper strikes the needle Correct the longitudinal motion of the double 16 at the back causing...

Page 54: ...ongitudinal 16 longitudinal motion of the looper is not motion of the looper and increase the clearance correct between the looper and needle when the looper reaches its most retracted position 5 Over...

Page 55: ...efer to the Instruction Manual Threading has not been done correctly Upper looper The blade point has a bad shape and Replace the upper looper with badly fails to catch the loops deformed blade point...

Page 56: ...ment 4 may fail to catch the upper looper thread Needle The needle is bent or crushed in its point Replace the needle At this time be sure to eliminate the cause for such needle bend or needle point c...

Page 57: ...point is crushed The needle point has been crushed and Refer to the clause relating to the needle point stitches are skipped got thicker and shorter crush Double chain looper The thread hole in the ti...

Page 58: ...ead loop on the double chain looper resulting in the stitch skipping shown below 11 Overlocking chain off thread is bad Position of the throat plate The throat plate has been improperly Correctly posi...

Page 59: ...er foot The rear pressure foot is indented and not Replace it or correct it to make it flush with flush with the presser foot sole so that it the presser foot sole cannot hold chain off thread Main fe...

Page 60: ...needle thread Thread tension The thread tension balance has been Refer to the Standard Adjustment for the looper disturbed thread take up components and increase the tension if necessary Needle The ne...

Page 61: ...increase in distance O 18 Looper thread bite Knife width The knife width is too large for the Use a knife having width suited to the overedging width overedging width Adjustment of the looper thread...

Page 62: ...ifferential feed dog Adjustment of differential feed The differential feed has been improperly Provide differential feed suited to the material adjusted 21 Puckering Needle The needle is too thick Use...

Page 63: ...atio The differential feed ratio has been set for Set it for stretching When stretching light weight gathering materials be careful not to cause the presser foot to contact unevenly with the materials...

Page 64: ...15 10 390 10 1 1 15 R 3 0 R15 30 R15 40 R 1 0 R 6 R 3 0 R15 20 57 R15 R 1 0 R 1 5 R 1 5 R15 R 1 5 R15 R 1 5 R 1 0 R 1 5 R 1 5 R 6 R 3 0 R 2 R 2 R 2 R 2 30 30 R2 R2 R15 R 2 R 2 40 R2 R30 Drilled hole 1...

Page 65: ...0 113 1 203 5 446 15 10 390 10 3 5 1 15 R 3 0 R15 30 R15 40 R 1 0 R 6 R 3 0 R15 20 57 R15 R 1 0 R 1 5 R 1 5 R15 R 1 5 R15 R 1 5 R 1 0 R 1 5 R 1 5 R 6 R 3 0 R 2 R 2 R 2 R 2 30 R2 R2 R15 R 2 R 2 40 R2 R...

Page 66: ...R 1 0 R 1 6 R34 R15 R 1 0 R 4 R 1 0 R28 R 3 0 R 6 R 3 0 R30 R 2 R 2 R2 R 2 30 R 1 5 Drawer stopper installing position Rear 4 10 hoke 26 spot face 4 deep 3 8 5 hole with 26 x 1 deep groove Drilled ho...

Page 67: ...pan E This manual uses environment friendly soyink The environmental management system to promote and conduct 1the technological and technical research the development and design of the products in wh...

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