INSTRUCTION MANUAL FOR BROTHER MODEL LH4-B814-1 ,-2,-3 High Speed Buttonhole Sewing Machine BROTHER INDUSTRIES, LTD. NAGOYA, JAPAN. From the library of: Superior Sewing Machine & Supply LLC 1 . Features and S pecificatinos .............................. ................................................................. 1 1. Main Specifications......................................... .............................................................. 1 2. Stitch formation.. .......................................................................................................... 1 3. Features .................................................................................................................. ..... 2 . Setting up and running ..................................................................................................... ') 1. How to fix the motor ............................................. ................................................. ..... 2 2. Setting the machine head on table top .. ....................................................................... 2 3 . How to us e t he machine .......................................................... ........................................ 4 1. Cleaning up .............................................. ..... .......................... ....................... ... ... ......... ·I 2. Needle and its setting .. .. ... ............................. ................................................. ............ .. 4 3. Selection of thread threading ... .... ................................................................................. 4 4. Winding lower thread ............................................................ ........ ............................... 5 5. T hreading bobbin case........................ .......................................................................... 5 6. Regulating lower thread tension ................................................................................... 6 7. Inserting bobbin case into hook ...... ......................................................... ..................... 6 8. Running. ................... ...... ................................ ............................. .... .............................. 6 9. Operating knife locking device ............... ...................................... .... ........ .................... 6 10. Emergency stop .. ......................................................................................... .................. 7 I I. Operating manual feeding lever .................................................................................... 7 4 . Adjustme nt. ......................... ............................................................................................... 7 1. Regulating upper thread tension ................................................................................... 7 2. Regulating the thread take-up spring ... ................ ... .. .................................... ........... .... 8 3. Timing the hook and needle .... ................................. .........................................._ .......... 8 4. Adjusting the width of buttonhole and position of buttonhole ................................. : .... 8 5. Buttonhole slot and length ............................................. ............................................... 9 6. Nun1ber of stitches ....................................................................................................... 10 7. Setting position of cutter .............................................................................................. 10 8. Adj usting upper thread tri mmer...... ............... .... ........................................................... 11 9. Replacing lower thread trimmer ... ........ ............ .. .......................................................... 12 10. Adjusting automatic thread breakage perceiving device ............................................... 12 l 1. Releasing tension on main tension regulator.......................... ........... ............................ 12 12. Releasing tension on lower tension regulator................................. ............................... 13 13. Adjusting oiling....... ...................................................................................................... l 3 14. The cutter falls on the scissors ............... ..................................................................... l-1 15. Installing the tape winder ............... ..................... ...................... ................................... l-1 5 . Tro uble s hooting ...... ....................................................................... .................................. 15 1. l ' hread breaks ....................................................................... ... .................................... 15 2. Stitch s kipping .............................................................................................................. IS 3. Irregular stitches. .. ..................................................................... .... ............................... 15 4. Threading of. ............................................... ...... .......................... ................................. IS 5. Irregular stitch at beginning ......................... ........................... .. .................................. IS 6. Pa rts list ...................................................... ............ .......................................................... I() From the library of: Superior Sewing Machine & Supply LLC 1. FEATURES AND SPECIFICATIONS 1 . M ain Specifica tions \lode I Ll 1-1-BSl-1 single needle lock stitch buttonholer Sub-class - 1 - 2 - 3 Use general materials general mater ials knitted materals Max. sewing speed 3.300 spm 1 1 Length of buttonhole 6.-lmm - 25mm( •1 " - 1" ) 6.-lmm - 32mm(J,{'' - I ),{") 6.-lmm- 32mm( ,l.{" - 1 •1 " ) \\"idth of buttonhole 2mm - -lmm(%;" - \/') 2mm- 6mm( %;" - 1 ~;n 2mm- 6mm(%;''- ').;';" ) Tape wind ing dc,·ice t\il Equipped Equipped Feeding mechanism upper upper & lo,,·er upper & IO\\·er Buttonhole stitches 60 - %0 st itches I I eight of presser foot l 2.5mm(Yz" l 2. Stitch form ation I) \\"hip stitch .....same s titch formation as ordinar~ · lock stitch zigzag formation. namely. zigza,g stitch of upper thread on lop and zigzag stitch of lower thread on bottom. 2) Pur l s titch .....Stro ng tension on upper thread applied. thus. the upper thread seems to be straight raised up on the lo"·er thread. T his is applied for buttonhole \\·or ks on shirts. pyajamas and the like. This model L! 14-8814 can be done either whip stitch or purl sti tch. depending on, the sewing materi­ a ls. and it is genera l! ~ · used ,,·ith purl stitch buttonhole on shirts. pyajamas and the like. and used with ,,-hip stitch buttonhole on knitted fabrics. With this machine. if it is used with purl stitch. both ends of buttonhole. portion of bar tacking can be clone with ,,·hip s titch in order to be able to get the beautiful and stable quality of buttonholes. As mentioned abO\·e. on the knitted fabrics and jerseys. it is recommended to do wi th whip s ti tch. It is v er ~ · easy to change the st itch formation fro m pur l stitch to whip s titch o nl~ · by changing the tension on the upper thread tens ion regulator. 3 . Feature s 1) T his model is ,-c ry fast to se,,· and can be obtained good qual it~ - buttonholes with easy adjustments. 2) Automatic lubrication can a,·oid the oiling to the machines in e\·ery morning. :1) It can raise up the producti,·ity as it ensures less thread breaks and thread off. -1) \ride wor king space can ensure easy sewing opera lion. ;)) A specially selected belt makes no fine adjustment of belt tension. 61 .-\n automatic knife locking de,·ice enables to pre,·ent the materials from damage in case of the thread breakage. 7) Speciall y designed speed reduction mechanism enables no iseless and less ,-ibrat ion ,,·orks. Hl It is ,·cry easy to change the length. wid th of buttonho les. number of stitches and amount of oil. 9) Emergency instant stop lever can guarantee the long durability of this machine and also can protect the breakage of impor tant parts. !O J Bobbin \\' indi ng can be clone eYen if machine stops. II) The applicable thickness of the materials is ensureclupto4.5- Smm. 121 T hi s machine is equipped \\'ilh adjustable rulers either to the d irection of back and forth or left and right. - 1 - From the library of: Superior Sewing Machine & Supply LLC 2. SETTING UP AND RUNNING 1. How to fix the motor As shown in Fig. 1, it is the measure· menl of the location of constant run­ ning induction motor, made by Brother. (4 pole. 1.440/ 1,720 rpm, 250W). If you purchased this machine as head only. please use with the constant runni ng induction motor of 4 pole. 250W or more wattage and in this case, the motor mounting bracket is different from our Brother motor, thus, please (Fig. 1) fo ll ow the instruction below : 1 357 ~0 oW I (Fig. 2) (Fig. 3) Firstly, put the two speed pull ey which is supplied with the machine head to the motor shaft and sel the position apart 357mm from the centre of the machine. Set the position apart 107.5mm from the edge of the table top to the end of pulley as shown in F ig 2. Drill the holes at the correct position. Secondly, put the motor to table top. Al that time, please make sure to insert the washers between table top and motor mounting bracket and fasten securely with set bolts. The correct motor rotation