Brother Industries BROTHER LK3-B220, Instruction Manual

Page 1: ...INSTRUCTION MANUAL FOR BROTHER LK3 B220 221 High Speed Bar Tack Machine BROTHER INDUSTRIES LTD NAGOYA JAPAN From the library of Superior Sewing Machine Supply LLC ...

Page 2: ...ssure of work clamp 12 13 Cleaning shuttle 12 14 Removing needle plate 12 15 Installing needle plate 12 16 Replacing needle hole plate 1 3 4 ADJUSTMENT 13 11 Adjusting needle bar 13 2 Adjusting feed mechanism 14 3 Adjusting thread trimming mechanism 16 4 Adjusting thread nipper IS 5 Adjusting clutch and brake 19 6 Adjusting work clamp lifter 21 7 Adjusting work clamp on B221 1 and 2 22 8 Needle co...

Page 3: ...vibration Especially the clutch mechanism is designed with speed reduction method with two belts and it ensures smooth operation when the machine starts and stops This feature brings the noiseless operation and prevent the thread off out of the needle Also on the needle bar mechanism it adopted with needle bar clamp to ensun noiseless operaticni and perfect stitch formations 4 All the mechanisms a...

Page 4: ...r stroke I 1 2 mm 41 2 mm 41 2111111 1 2 mm 41 2 mm 4L2mm 4L2mm 41 2 mm 41 2 mm Height of ork clamp II lOmm 10mm 10mm 10mm lO mm lO mm 10mm lOmm 10mm eedle movement I N MODEL LK3 B221 I LK3 B221 LK3 B221 LK3 B221 LK3 B221 LK3 B221 LK3 B221 LK3 B221 Sub class I 1 I 2 3 l 5 6 7 8 Application IEyelet button Eyelet button Belt loop Labelling Labelling Labelling Labelling Belt loop hole end hole end I ...

Page 5: ...lever ffff1 Cam cover Face plate Nipper operating lever 111ain tension ISSembly Presser arm Needle bar I Tack width regulator Emergency stop Bed base motion lever B Model LK3 B221 1 2 D Model LK3 B221 4 7 FUDTHER3 Bed Work clamp lifter C Model LK3 B221 3 8 3 From the library of Superior Sewing Machine Supply LLC ...

Page 6: ...g bolt D Halo for machine bod boso bolt t Holo for hond rest 1200 j Putting the chains l Work clamp lifter l Adjust length o left J oh Trea Je_ Clutch actuatmg lever Clutch actuating r __ rod Left treadle Adjust length of chain Right treadle Clutch actuating rod is included in accessories Putting belts Belt for h1 gh speed operat1on l on ger belt l w mder From the library of Superior Sewing Machin...

Page 7: ...50 Hz 130mm 60Hz llOmm Sharp knife t I 6 Remove 1 900 spm 1 700 spm 1 500 spm 1 300 spm 120 trim 108mm 96mm 84mm 102mm 92mm 82mm 72mm Base for belt joining The belts contained with this machine head are made of polyulethane rubber of Smm which does not cause any slippage on machine s running and with the heat adhesion it ensures durability without any anxiety of breakage on the joining points duri...

Page 8: ...isengaged out of stop cam the belt guide lever is positioned at slow speed pulley and idlt pulley as per Photo 2 o At a few stitches before the machine stops when clutch tripping cam lever is at the stop cam the belt guide lever is positioned at slow speed pulley and idle pulley as per Photo 1 o At the stop position the belt guide lever is positioned at idle pulley and bobbin winder pulley as per ...

Page 9: ...peration Right treadle Left treadle 7 o When the switch is ON motor starts to run and the idl pulley starts to run l Release the right tr adle when the machine is in operation Machine stops automatically r When the left treadle is de pressed it works the thread trimming and thread nipper mechanisms and lifts work clamp From the library of Superior Sewing Machine Supply LLC ...

Page 10: ...lling the needle Loosen this screw w II Insert needle all the way up into need4e hole in the needle bar with its long_ ___ groove facing toward you and fasten needle tightiY tJ J with the screw To stop the machine during the opera tion depress the emergency stop lever before completing sewing cycle position o When the work clamp is raised up the machine will not start even if the right treadle is ...

Page 11: ...6 LK3 B221 4 DB x 1 11 LK3 B221 5 DB x 1 11 LK3 B221 6 DB x l 11 LK3 B221 7 DB x 1 11 LK3 B221 8 LQ x 5 16 If thread is unevenly wound on bobbin l e Raise the position of tension discs Lower the position of tension discs The position of tension discs can be adjusted by positioning up or down the tension collar 7 Threading the bobbin case Tension spr ing 10 1 Put bobbin in bobbin ass the thread Slo...

Page 12: ... S II old latch insert bobbin case onto pin at the centre of shuttle and release latch when bobbin case properly placed Leave about 4 em of the thread hanging on 10 From the library of Superior Sewing Machine Supply LLC ...

Page 13: ...r Thread Dacron 50 Cotton 50 Dacron 80 When the thread is trimmed after the main tension is released at the final stitch enough length of the upper thread should be left put of the needle eye Sub tension Sub tension plays a role to prevent the upper thread from loosening when the thread is trimmed Adjust the sub tension so that the upper thread will be fairly taut between the needle and the materi...

Page 14: ...re of work clamp 13 Cleaning shuttle 1 Remove shuttle race with Adjust the work clamp so that it exerts no more pressure than necef sary to prevent the material from slipping 2 Remove shuttle After cleaning put a drop of bobbin case oil inside of shuttle race 14 Removing needle plate 15 Installing needle plate R move four flat head screws and then needle Match marking in assembling plate 12 From t...

Page 15: ... needle hole diameter for thick materials and another special size 4 0mm in needle hole diameter for ultra heavy materials ADJUSTMENTS 1 Adjusting needle bar The proper needle bar rise and needle bar height are necessary for the needle in its upward travel from the lowest point to form the correct loop of the upper thread and for the shuttle point to properly hook the loop 1 Needle bar rise When t...

Page 16: ...be tween the centre of needle bein met with shuttle point is 0 0 0 0Hmm To adjust the clearance loosen the shuttle hook set screw and rotate the adjusting screw and fasten the set screw tightly after completion Bar tacks will be made as the power is transmitted to tack length and tack width mechanisms through the outer and inner grooves of the feed cam The tack design stays within the rectangular ...

Page 17: ...cket so that the needle hole will come exactly at the centre of work clamp then tighten the fastening screw 4 Loosen the tack width lever fa tening screw and lower the hinge block all the way down then tighten the fastening screw Again move the presser arm and set the presser arm so that the needle hole will come exactly at the centre of work clamp then tighten the fastening screw 1 Raise the clut...

Page 18: ...d from slipping out 2 The thread presser releases the thread just before the fifth stitch is formed 3 As soon as the upper thread is pulled up by the thread take up lever the lower thread knife catches the lower threarl At this moment the tip of the upper thread knife is just in front of the needle hole 4 The upper thread knife enters the upper thread loop while the shuttle point comes to its down...

Page 19: ...e final stitch 3 Lower thread knife and thread trimming lever 4 Adjusting thread trimming stopper screw hole pper thread knife At the stop position loosen two screws and adjust the thread trim ming adjusting screw so that the point of lower thread knife will be po sitioned at the red mark on the needle plate When work clamp is lifted up adjust by stopper screw so that thread trimming lever roller ...

Page 20: ...sed it works the thread nipper mechanism and at the first stitch the needle bar thread nipper is lightly tightened to prevent the thread from slipping and being jammed Before the needle comes down for the second stitch the thread nipper is released and the main tension is tightened Make adjustments if necessary in the following manner 1 At the stop position adjust the roller position so that its c...

Page 21: ...in tension will be light and at the position of the roller being in the recess portion of the cam adjust it so that the main tension will be loosened 5 At the position of the lever pawl being released out of the stop lever adjust the thread nipper moving left and right so that the needle bar thread guide ma catch the thread surely 5 Adjusting clutch and brake Unless the clutch and brake are in ord...

Page 22: ... loosen two set screws and move stop cam left or right to adjust At that time make sure to get proper timing by turning high speed pulley by hand 6 Pressure of the clutch lever spring Adjust the clutch lever spring so that it has just enough tension to permit the clutch stopper to fit positively into the groove of the stop cam to stop the machine gently In case of adjustment loosen the fastening s...

Page 23: ...actuating lever stopper Nut 6 Adjusting work clamp lifter In order to prevent the right treadle from going upward the clutch actuating lever stopper is limited the movement of the clutch actuating lever In case of adjustment adjust in the following manners 1 Be the machine at stop position 2 Fix the actuating lever shaft with set screw 3 Set the machine in normal position 4 Adjust the height of th...

Page 24: ... to Le 2 5 3 0mm between the presser arm and the presser priug by set screw 7 At the stop position when the tett i readle is depressed just before the thread trimming rnechanio m 1s engaged adjust the relation b tweem the top lever Hnri the collar so that the 7 Adjusting work clamp on 8221 1 and 2 ueedle bar thread guide 1 tightened The two presser feet a e opened about 2 mm when th work clamp are...

Page 25: ...er device is featured to avoid the thread breakage with syn thtic thr ad even at maxi mum high speed of 2 000 stitches per minute Oil tank Needle cooler adJUSter o Cock Vhen you use this machine with synthtic thread open th cock vertically and if not close the cock 0 Thumb screw Adjust oiI flow depending on the thickness of the materials and thread o If you turn thumb screw clock vise you can get ...

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Page 40: ... I 118 220 192220 0 13 Printed in Japan From the library of Superior Sewing Machine Supply LLC ...