From the library of: Superior Sewing Machine & Supply LLC
Page 1: ...OPERATING INSTRUCTIONS MODELS LSW 27BLK LTW 27B 27BK 27BM SEIKO SEWING MACHINE CO LTD TOKYO JAPAN From the library of Superior Sewing Machine Supply LLC ...
Page 2: ...H LENGTH 5mm LSW 27BLK 6 5mm LIFT OF PRESSER FOOT 7 mm by a lever OILING Semi self oiling system SIZE OF BED 177 mm X 518 mm MOTOR 250W 2P clutch motor DIAMETER OF MOTOR PULLEY 50 cycle 80 6 60 cycle 65 6 LTW 27BK 27BM LSW 27BLK 50 cycle 6656 60 cycle 55 NEEDLE GAUGE 1 16 to 1 1 2 LTW 27BK LSW 27BLK 1 8 to 1 2 LTW 27BM 5 16 standard From the library of Superior Sewing Machine Supply LLC ...
Page 3: ...lt 6 Adjusting the height of the feed dog 7 Adjusting the timing of the needle plate needle and feeder 7 Adjusting the height of the needle bar 8 Timing between the hook and needle 9 Timing adjustment 9 Adjusting the clearance 10 Relative position between bobbin case and opener 10 Adjusting the height of the presser foot 11 Fine adjustment of the needle feed 11 Changing the needle gauge 11 SPECIAL...
Page 4: ...ate the machine even if for testing unless it has been pro perly oiled 1 To fill the oil reservoir on top of the machine pour oil through the oil filler hole A Fig 2 until the oil level reaches to the upper reference line in the oil window B Fig 2 Oiling is automatically made by the vibration of the machine while sewing operation through oiling wicks in the machine and oil flow stops automatically...
Page 5: ... inside of arm top cover is automatically made by the vibration of the machine while sewing operation Stop oiling temporarily by the following method at your option in case of long sewing operation When point of the dial enters into point of arm bed cover after turning the dial the dial goes down and oiling stops completely NEEDLE The size of the needle to be used should be determined by the size ...
Page 6: ...obbin from left to right Pull the thread into the slot 4 and between the bobbin ca se ojjener 5 and the projection 6 and under the tension spring 7 Draw out about 5 mm of the thread on the needle plate and close the slide plate leaving a sufficient space for passage of the thread WINDING BOBBINS AND ITS ADJUSTMENT Push a bobbin on the bobbin winder spindle 1 as far as it will go Pass the thread fr...
Page 7: ... bar to its highest point From the thread stand lead the thread to the thread guide 1 A on top of the machine down to the upper guide hole of the thread guide 2 B from right to left Pass the thread in weaving fashion through the other two holes in 2 B and from right to left over and between the tension discs 3 C Now pull the thread downward from right to left beneath and around thread controller 4...
Page 8: ...fect stitching Tight tension of needle thread Loose tension of needle thread Fig 8 A TENSION OF THE UPPER THREAD To adjust the tension of the upper needle thread turn the serrated nut 1 to the right for increasing tension If you desire to decrease it turn the nut to the left B TENSION OF THE BOBBIN THREAD It is regulated by means of the tension screw 1 To increase the tension turn the screw to the...
Page 9: ...y show number of stitch per inch Stitch length m m REVERSE STITCH To do tacking for the purpose of locking the ends of seams rapidly depress and release the lever E Fig 2 When reversing feed of the machine keep the lever E depressed as long as required For all other forward stitching the lever remains in up position REPLACEMENT OF THE TIMING BELT 1 INSERTING THE BELT Turn the balance wheel toward ...
Page 10: ...m top cover etc to their original places Finally adjust the timing marks mentioned in the item No 1 ADJUSTING THE HEIGHT OF THE FEED DOG The maximum height of the feed dog 1 from the surface of the needle plate 2 is normally 1 mm To adjust this height tilt the machine turn the handwheel so as to raise the feed dog to its highest point Loosen the set screw 4 Fig 3 and raise or lower the feed dog as...
Page 11: ...tighten the screw and replace the side plate ADJUSTING THE HEIGHT OF THE NEEDLE BAR 1 When the needle bar is at its highest point normally the measurement between the surface of the needle plate and the upper end of the needle eye is 22 2 mm To adjust this loosen the screw 2 Fig 17 and move the setting position of the needle bar and the needle bar connecting stud 3 Fig 17 to get the correct positi...
Page 12: ... between the hook point and the needle hollow should be 0 05 to 0 2 mm If they are not measured as above adjustments are made as follows 2 1mm Fig 18 TIMING ADJUSTMENT Loosen the two set screws 1 Fig 19A set the position of the large gear 2 Fig 19A to the center of the small gear 5 Fig 3 and tighten the two set screws securely Loosen the screw 6 Fig 3 on the small gear move the hook and set the pr...
Page 13: ...d tighten the screw Be sure to use perfect needles RELATIVE POSITION BETWEEN BOBBIN CASE AND OPENER Loosen the screw 1 turn the balance wheel until the opener 2 is located at the extreme right hand position of its travel In this position adjust it so that the clearance between the inside edge of the opener and the tab on the bobbin case holder is about 0 2mm After the adjustment tighten the screw ...
Page 14: ...sen the nut 5 Fig 12 and bring 6 Fig 12 close to the feed driving rock shaft 7 Fig 12 for more feed momentum or keep away from for less momentum Tighten the nut firmly CHANGING THE NEEDLE GAUGE Remove the needle presser foot needle clamp needle plate and feed dog in this order The needle clamp is a screwed type that is removed with a pair of pliers Put the desired needle clamp in place by screwing...
Page 15: ...e of lower thread loops when sewing seams with acute less than 90 andles NEEDLE BAR STOP MECHANISM Pushing the needle bar change over lever 1 Fig 21 to either position L or R will selectively suspend the reciprocating movement of either one of the two individual needle bars Basically there are two functions to this mechanism one which causes the needle bars to operate and stop and the other which ...
Page 16: ...e bars as well as with the set screws of the needle bar position guides At their opposite ends the needle bars are locked to the needle bar con necting stud by means of three special high strength steel balls expanded by a mechanism inside the needle bars beyond the diameters of the bars Con sequently when positioned as described above and as pictured on Fig 22 the needle bars move up and down wit...
Page 17: ...ams 10 and 11 to likewise move downward This allows upper balls 19A to recede below the diameter of the needle bar while at the same time forcing lower balls 19B outwardly beyond the diameter of the needle bars Lower balls 19B are now forced against the tapered mouth 14 of the needle bar bushing 13 and will stop the downward movement of the needle bar While needle bar position guide 15 contacts th...
Page 18: ...ism OPERATION OF THE NEEDLE BAR CHANGE OVER FRAME Shifting the needle bar change over lever Fig 21 to R will cause the needle bar change over frame to move in direction of the arrow Fig 25 The needle bar change over frame connection when the needle bar lowers and was disengaged is fixed to their normal position as Fig 25B At the same time the needle bar stops when same reached in its next highest ...
Page 19: ...ge of the thread The cap type design of the bobbin case assures smooth thread handling The horn likeextension 4 of the hook gib retains the upper thread temporarily taking up the slack while it courses around the hook Thus looping is prevented particularly when heavy threads or those lacking smoothness are employed Automatic lubrication of the moving parts of the hooks allows the main tenance of a...
Page 20: ...es with the thread guide hole in retainer 2 When in this position further demand for bobbin thread is then pulled out from under bobbin case tension spring 3 The function and effectiveness of spring 1 is such that slack thread loop containing as much as 20 mm 25 32 of thread can be absorbed THREAD CONTROLLER SPRINGS There are two separate and individual thread controller springs one for each of th...
Page 21: ... slot 6 and turn to the left to tighten the spring tension and to the right to loosen same After the desired tension has been determined tighten set screw 5 III To adjust the tension of the front thread take up spring 7 loosen two set screws 9 in collar 8 turning same to the left to tighten and to the right to loosen it Upon determining the desired tension of this spring tighten set screws 9 and a...
Page 22: ...mp set screws 4 V Turn handwheel toward you allowing needles to rise When the rotating hook point crosses the centerline of the rising needle it should be 2 mm 5 64 above the upper end of the eye of the needle Adjust if necessary Fig 30 TIMING ADJUSTMENT OF THE LOWER STEEL BALL Turning the handwheel confirm whether the needle bar motion is not smooth due to projection of the lower steel ball 2 Fig...
Page 23: ...the releasing rod to be j arallel with the knee lifter connecting rod 0 Fig 33 At the same time adjust the length of the chain so that the releasing rod is parallel with the underside surface of the table 3 Set the pedal extension rod 9 Fig 33 with the screw 8 Fig 33 to the pedal and attach the pedal extension rod 10 Fig 33 to the releasing rod at a little to the left fr m the center of it Care mu...
Page 24: ...ife loosen the two screws 1 and pull down the knife 2 to remove it 2 To replace a new knife turn the handwheel until the knife lowers to its lowest position Then put the knife like the figure 35 but adjust them so that the clearance between the surface of the needle plate 3 and the edge of the knife 2 is 1mm as the illustration on the figure Securely tighten the two screws J 1mm Fig 35 From the li...
Page 25: ...he right end of the shaft comes out about 1 mm from the oscillating crank 1 Fig 36 also adjust the crank to actuate up or down at an equal distance starting from the horizontal line A Fig 37 Then tighten the screw 3 Fig 36 2 When fitting the stop collar adjust the clearance between tlie end of the pin 1 Fig 37 and the groove on the part 2 Fig 37 is 0 5mm and in this position set the stop collar 4 ...
Page 26: ...s is due to the reason that the knife does not operate while the material is fed and it cuts the material after the feeding motion To time this loosen the two set screws 1 adjust the rotating position of the cam 2 faster or slower as may be required Then tighten the cam set screws f rv Fig 38 From the library of Superior Sewing Machine Supply LLC ...
Page 27: ...From the library of Superior Sewing Machine Supply LLC ...
