Seiko JW-28BL-20 Operating Instructions Manual Download Page 6 | Manualshive

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From the library of: Superior Sewing Machine & Supply LLC

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Summary of Contents for JW-28BL-20

Page 1: ...OPERATING INSTRUCTIONS FOR JW 8BL 20 JW 28BL 20 JW 8BL 30 JW 28BL 30 SEIKO SEWING MACHINE CO LTD TOKYO JAPAN From the library of Superior Sewing Machine Supply LLC ...

Page 2: ... kgs 151 kgs 0 377 M3 TWIN NEEDLE JW 28BL 20 JW 28BL 30 MAX SPEED s p m 1 500 MAX STITCH mm 10 MAX LIFT OF FOOT mm 20 NEEDLE DY X 3 sandard No 24 SY5213 794 BOBBIN SIZE mm 37 x 13 WORKING SPACE mm 508X153 762X153 BED DIMENSION mm 846 X 230 1 100x230 POWER REQUIRED W 400W 2P MOTOR PULLEY DIA mm 60 509 50 60HZ NET GROSSWEIGHTS M 112 kgs 154 kgs 0 377 M3 NEEDLE SPACING 3 16 4 7 mm 2 3 8 60 mm Standar...

Page 3: ...and the needle hole of the feeder 7 Adjustment of the height of the feed dog 7 Timing between the hook and the needle 8 Adjustment of bobbin case opener 9 Adjustment of the height of the presser feet 9 Timing of the vibrating and lifting presser feet 10 Adjustment of the clearance for the vibrating and lifting presser feet 10 Adjustment of the thread controller spring 11 Replacement of the connect...

Page 4: ...od the new machine should be oiled more frequency 2 The machine pulley turns toward to the operator The auxiliary hand wheel turns to clockwise 3 Do not opearate the machine at maximum speed of 1 500 s p m for starting operation To take practice operation at speed of 1 000 s p m but opera ting speed are to be changed to proper condition suitable for the materials in case by case OILING Figs 2 3 4 ...

Page 5: ... machines are set up to use standard needle of DY x 3 standard No 24 SY5213 794 The size of needle to be used should be determined by the size of thread type and thickness of the sewing materials 2 To insert the needle turn the machine pulley over toward you until the needle bar moves up to its highest point put the needle up into the needle bar as deeply as it will go with the long groove of the ...

Page 6: ...s the thread auto matically In engage with the operation of the machine The bobbin will automatically be stopped after the bobbin is filled with thread o i 3 X A X 3 Fig 10 REMOVING AND INSERTING THE BOBBIN Figs 12 13 1 Draw back the side plate 1 on the bed of the machine and raise the hinged latch 2 to a vertical position then remove and insert the bobbin 2 Insert the bobbin and pull thread out a...

Page 7: ...le moves down and up again to itshighest point thus catching the bobbin thread draw up the needle thread and the bobbin thread will come up with it through the hole in the feed dog Lay the threads back under the presser feet and close the slide St REGULATING THE THREAD TENSIONS Figs 16 17 1 The tension on the needle thread is regulated by the thumb nut Fig 16 A 2 The tension on the bobbin thread I...

Page 8: ...ained operate the machine after fully confirmed releasing the button 1 to the original position Fig 19 ADJUSTMENT OF THE PRESSURE Fig 19 The pressure of the presser feet is regulated by the adjusting screw To increase the pressure turn the screw to clockwise and decrease it turn the screw to counter clockwise REVERSE STITCHING Fig 20 The chain for the feed reversing pedal is connected to the hook ...

Page 9: ...on of the feed dog against the needle the needle should be passed through the center of the needle hole of the feed dog To adjust by the screw for the feed rock shaft bell crank 4 3 Securely tighten the screws after finished adjustment A I ADJUSTMENT THE HEIGHT OF THE FEED DOG Figs 23 24 25 The maximum height of the feed dog from the surface of the needle plate is normally 1 3 mm To adjust this he...

Page 10: ...e to adjust in changing gear condition between hook driving gear 2 and hook shaft gear 3 Securely tighten the 2 set screws for hook driving gear after finished adjust ment 2 Normal clearance between hook point and scarf of the needle is In 0 02 0 1 1 Loosen two screws 4 and 5 for hook saddle 2 Move hook saddle to right or left as may be required until hook point is as close to needle as pos sible ...

Page 11: ...ng pres ser foot at stopped position of the stop lever C is 19 mm When step on the lifting pedal the stop lever C will be released by the lifting lever B 1 To change the relative lift of the presser feet loosen the screw 1 at the above condition 2 The height of lift of the presser feet is adjustable by moving the screw of presser bar lifting bracket 3 Normal distance between presser bar position g...

Page 12: ...E CLEARANCE FDR THE VIBRATING AND LIFTING PRESSER FEET Fig 33 RE ADJUSTMENT THE TIMING OF THE VIBRATING AND LIFTING PRESSER FEET Fig 32 The amount of the lift of the alternating feed for the vibrating and lifting pres ser feet are to be adjusted by the lifting bell crank link screw stud 1 To decrease the movement in setting the stud 1 at the upper position and to increase the movement in setting t...

Page 13: ...ely retighten the spring stud screw Fig 34 REPLACEMENT OF THE CDNNECTIGN BELT A When the connection belt removed from the pulley for adjusting and or re placing purposes of the parts it should be replaced by the processes as fol lowings Figs 35 36 1 Turn the machine pulley toward you so that placed the take up lever A at the highest position 2 Turn the hook shaft with the fingers until the arrow m...

Page 14: ...chine pulley 4 Loosen the three screws in the arm shaft bushing 5 and remove the bush ing 6 5 Lift the belt up through the arm cap hole after removed the bushing 6 as far as possible and draw it out through the space normally occupied by the bushing 6 Replace the connection belt as opposite processes as above for removing it 7 Securely tighten all the screws so as to fit the arm shaft firmly free ...

Page 15: ...read from the hook 2 To re engage the clutch press down the lock stud A near the base of the arm by left hand and turn the machine pulley backward slowly by right hand then the safety clutch will be released 3 In the case easily releasing the safety clutch adjust the pressure by the screw B for lower belt pulley after removed connection belt C To increase the pressure in turning the screw B to clo...

Page 16: ...nder driving gear 3 in the arm shaft to shifting right or left u o l V V ADJUSTMENT OF THE OILING FOR THE HOOK SADDLE Fig 43 Loosen the screw for the oil adjustment dial 3 and adjust oil supply by turning the oil adjustment dial 2 Maximum oil supply at the directly in line of the point mark 1 on the hook saddle and the center line of the dial 2 Stop the oil supply at the vertical position of the c...

Page 17: ...hain 3 is hooked crank one side and the other hook of chain 3 is dinged the hole drilled stand horizontal plate Chain 3 is used as stopper to prevent treadle 4 is not hit by camfollower d Screw 6 is drived tightly after crank set up correctly Completion of Treadle Set From the library of Superior Sewing Machine Supply LLC ...

Page 18: ... MEMO From the library of Superior Sewing Machine Supply LLC ...

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