Brother VX1140 User manual

GENERAl- INFORMATION
°This service manual was compi[ed for use when repairing
the VXl120, VXll40 and VX1250 Zigzag Stitch Sewing Machines.
• Usethis manual, together with the Pal_s Catalogr
when making repairs.
• This manual was wri[_en based on the most up-to-date
product specifications at the time of printing.
Some machine specifications may have been changed to
improve the quality of the product.
Cont_lct the manufacturer or you_ local sales representative
for information on such changes.
Brother Industries, Ltd.
Nagoya, ;apan
• Symbols used
T - ! M°ve[nepartinthedirecti°n°f[hearrow
--_ Set the clearance as indicated.
Move the part to it5 highest _r
lowest position.

Zigzag
1. PRINCIPAL MECHANISMS COnnsclingrOd
Bobbin winder
Nsed e bsr
T-belt
(BaYing bell)
Horlzor3taJ feed 8ha4t ing foal
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2. DISASSEMBLING THE SEWING MACHINE
I. Remove_hescr_w_ndthef_cepJmefromtbeJeit_ided_emachine.
_. Loosen lhe [hree screws a[[achin 8 the front and rear carets _nd _hescrew on the levi side Use a screwdriver to disenBa_e the front
cgver tab and remove the [font c_)ver.
;. Lower the presse_ _oot [iftel, Iemove [he four screws indicated and remove the rear cover¸
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3. ADJUSTING THE CLEARANCE BETWEEN THE NEEDLE AND THE SHUTTLE
HOOE (SHUTTLE RACE POSITION)
STANDARD
_. Theclearance between the needle and the shutt]e hook should be between 0.02 and 0.1 ram.
2. The shuttle race should be posl ioned correc ly wL h respee o he urnmg dlrec ion of he shuLLle race.
ADJUSTMENT
1. SeL the needle position selector to "M" and the stitch width knob LO"0".
_. Turn the baJ_nce wheel to set the needle and the shuttle hook to the correct timing position.
3. Use a screwdriver to _um the needle bar supporter stud slightly to either the right or left and a_just the crearance between the needle
and the shuttle hook.
NOTE
A line through the center of the needle should pass through the center of Lhe shuLtle hook shaft.
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4. A.DJUSTII_G THE CLEARANCE BETWEEN THE SHUTTLE DRIVER AND THE
RACE WAY
STANDARD
There should be no clearance be_veer_ _he shuttJe driver and the race way and the shuttle driver should rotate smoothJy.
_.DILJSTMENT
_, Loosen the two driver shaf[gear screws,
2. Adjust lhe dearance of the drlver shaft.
4. Tighten the t_vo driver shaft gear screws
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5. ADJUSTING THE NEEDLE SWING
STANDARD
When the stitch width knob is set at "S", [he needle swing shou]d be 0.05 mm or less when the needle is moving down from the needle
alate to its lowest position. When the needle is moving up from its lowest position to the needle plate, the needle swing should be 0.15
mm or less Both sides of the needle plate hole should have these ¢Eearances.
ADJUSTMENT
I, Loosen the i_vo zigzag base assembly screws.
2. Align the upper shaf_ _ear and the zigzag cam gea_
3. Tighten lbe two zigza_ base assembly screws.
NOTE
To coFrecl _he needle swing, align the upper shaft g_ar and the zigzag cam gear at an,/two points.
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6. CENTERING THE NEEDLE
STANDARD
When the needle position selector is set at "M" and the stitch width knob is se_ at "0", the needle should be centered in the needle plate
hole.
ADJUSTMENT
Set the needle position selector to "M" and the stitch width knob to "0".
2. Turn the balance whee] to lower the needle until it is just above the needle plate.
S, Loosen thefcrew on thezi_zag connecting rod assembly.
4. Center the needle in the needle plate hole
5. Tighten the screw
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S. ADJUSTING THE TIMING OF THE NEI_DLE AND THE SHUTTLE HOOK (SHUT-
TLE HOOK POSITION)
STANDARD
,Vhen hes chwdhknob sse a '5 and heneedle s asedon heJef sdeavl,7 o2.1mmfrom[tsrowestpos o ,thesh ttlehook
Joint should align with the side af the needle.
_DJUSTMENT
:. Set the stitch width knob to "5", then lower the need]e to its [o_,esl poskion at the left side of the needle plate.
2. Loosen the set screw on Lhedrive connecting rod.
5. Raise the needle between l.T and 2.1 mm andaligntheshuttlehookpointwiththes[deoftheneed[e.
nTighten the set screw.
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9. ADJUSTING THE HEIGHT OF THE NEEDLE BAR
STANDARD
VVhen the stitch width knob is set at "g" and die needle contact5 the shuttle hook when the needle i_ an the right side, lhe clearance
between the top of the needle eye and the shuttle hook point should be between 0.8 and 1,2 mm.
ADJUSTMENT
Set the stitch width knob to "5", then lower the neefl]e to its lowest position at the right side of _he need[e plate,
2 Turn the balance wheel unt[[ the needle contacts the shuttle hook.
3. Loosen the set screw on the needle bar.
4. Move the r_eed{e bar elther up or dow_ umjI _heclearance between the top of the needle ege and the shuttle hook point is within Q.8
and 1,2 mm
T_ghten the set screw, i
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(Right) ®
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10. ADJUSTING THE TENSION OF TH]_ TL_ING BELT
STANDARD
Fhere should be between 4,0 and 6,0 mm of slack in the th'n[ng belt when the cenler of the belt is pushed with appro×imate]y 200 g of
pressure
ADJUSMENT
I. Loosen the b_o screws on the _TIotor holder,
2. Movethemotorhofdertoadjustthebefttension_oitmeetstheabovestandard.
3, Tighten the b4,o screws,
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11._JUSTING THE HEIGHT OF THE FEED DOGS
STANDARD
£
When he reed dogs are raised o heir hEghes po_J ion, hey should be belween (3.9 and 1 I mm higher than the needle plate.
ADJUSTMENT
•Turn the baFance wheel to raise the needle bar to ils highest position.
2. Loosen the screw.
3. Move the vertical feed arm to [he lel:t or tight to adjust the heiBht of lhe teed dogs.
4• Tighten the screw.
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M Iq FI M_ o9-1,1mm
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12.ADJUSTING THE HEIGHT OF THE PRESSER BAR
STANDARD
The clearance between the pres__ertoot and the needle pla_e should be between 6.0 and 6.5 f_m.
ADJUSTMENT
I, Raise the presser foot,
2. Loosen the screw on the presser bar guide bracket,
3_ Adjust the height of the presser bar
4 Ti_hter_ the screw,
NOTE
Check that the presser 6Jot and _ed dogs are aligned
80_65mm

13. ADJUSTING THE STITCH LENGTH FOR FORWARD STITCHING AND BACK-
STITCHING
STANDARD
When the stitch length knob is set at "2", the_e should be a difference of :10% in [he length of the forward stitch and the backstitch.
ADJUSTMENT
1. Set the stitch width knob to "0" and tile stitch length knob to "2".
2. Loosen the screw.
3. TuB the reverse sewing regulator shaft with a screwdriver to adiust the teed. (The feed shouJd be about the same.)
4. Tighten the screw.
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14.ADJUSTING THE UPPER TENSION CONTROL DIAL
STANDARD
,Vhen the upper tension control dial i_ set at "O" and the presser foot is lowered, the upper thread tension should be between 5 and IO g
_vhen cotton thread #50 is used.
gDIUSTMENT
Set the upper tension control diaJ to "O" and pass cotton thlead between the tension discs.
Lower the presser loot.
3. Remove the upper tension disc and the stop ring
4. Remove the upper tension control dial.
3. ,Measure the _hread tension using a tens#on gauge and _ucn the _¢mw to adius_ the tension so i_ is between 5 and I 0 g.
Insert the upper tension control dia] onto the upper tension disc in Lhe"O" posiLion and secure itwith the stop ring
Align the upper tension disc with the"O".
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15.ADJUSTIIIIENT OF BOBBIN WINDING
STANDARD
The thread should be wound even]y around thebebbin and should h!] 75 to 85% of the bobbin.
ADJUSTMENT
1 If the thread doe_ not wind evenly around the bobbin, s[ightly]oosen the screw on the thread guide/bobbin winding tension disc
2. Move the thread guide/babbin winding tension disc vedically so that the thread evenly wind_ around the bobbin
3 Tighten the screw on the thread guide/bobbin wlnding tension disc
4, Slightly Joosen the screw on the bobbin pres_eE
5. Move _he screw On the bobbin presser to adiust Lheameunt of thread that winds around the bobbin.
6. Tighten the screw on Lhebabbin presser.
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