Brother 082-8792 User manual

INSTRUCTION MANUAL
FOR
BROTHER 082-8792
SINGLE NEEDLE
ADJUSTABLE TOP AND BOTTOM FEED
LOCK STITCH
MACHINE
NAMES OF MAIN PARTS
DB2- B792
Usc
Sewing speed
Maximum stitch length
Ill Th ank you very mu ch for yo ur
pur cha se of a BROTH ER sew in g
machine .
The full pe rform ance of yo ur new
se wing ma chine depends, a b ove all,
on
co rr ect op era ti on.
Be sure to care fully read the
fo ll owi ng ins truct io ns before use.
- 003
I - 013 - 015
For medium ma te ri als Gathering
4500 spm 3500 spm
4
mm
5 mm
Maximum upper feed amou nt
6 mm
8 mm
0 Nee dl e bar
f) Presser-regulation thumb scr ew
0 Th r ead re tain er
0 Pr e-t ens ion
0 Pulley
0 Fee d-r everse lever
( HOW TO INSTALL THE MACHINE
Table
Pre ss er fo ot heig ht
(Knee lifter)
Feed
dog height
ccdlc
Usc ga u ge
Shirring dev ic e
10 mm
0.8 mm
DB X I
Group A I Group B Group L
--------1
In cluded
)
* Fit the h ead hinges 0 in the table slot, fit it to the rubb er hinge b as e f) of the ta bl e, and th en pl ace the head onto the rubb er pad s 0
at the four co rners.
* When you u se m ode l DB2- 8792-013, 01 5 (p eda l system), please make a hole for chain as sh ow n on the figure above .
( ADJUSTMENT OF THE KNEE LIFTER STOPPER
)
* L oose n th e nut and a dju st the l ef t kne e li f ter sto pp e rO so that th ere isa bout 2mm cl ea rance be tw een the knee lifter 0 and knee lifter
pusher
bar f) .
* Wh en yo u pu sh the knee pad, l oo se n th e nut and adjust the ri ght kn ee li fter st oppe rO so th at there is about I mm cl eara nce betw ee n
the oil
pan and the knee lifter 0 .
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From the library of: Superior Sewing Machine & Supply LLC

[ HOW TO INSTALL THE BELT COVERS
Stud
(black)
Spring
wash er
HOW TO INSTALL THE BOBBIN WINDER )
* Install the bobbin wi nd er 0 to the tabl e with two screws f) .
(Install it so that the bobbin wi nder pulley 0 will not slip.)
I. Sc r ew the bl ack stud into the back of the machine head .
2. Screw the white st ud into the machine h ead.
3. Temporarily tighten screw A and the s pr ing washer to the
white s tud.
4. Install belt cove r U with screw A as shown in the figure at the
left.
5. Install belt cover U with screw B and the spr ing washer.
• When in sta lling belt cover U, please bring down the machine.
6. Install belt cover D with sc rews and washers.
• When installing belt cover D, pl ease set up the machine.
* When re placing the b elt, rem ove belt cover U.
( HOW TO INSTALL THE SPOOL HOLDER BASE )
• Install the spool holder base 0 at the right corne r of the table
with screws f) .
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[ LUBRICATION
1. Lubrication
( I) Su pp ly oil sl ow ly to the mark at the left (" HI G H").
If the o il level falls bel ow the mark at the right ("LOW") , add
oi l.
(2) If the o il becomes contaminated, rem ove the oil cap 0 and th e
oi l cover sc rew G.
(3) Wipe away contami n at ion fr om the ma gnet f) .
* Use th e oil specified by BROT H ER: Hi-White 70.
2. Oiling
* Before using the mach ine, be sure to s up ply one or two drop of
o
il to the point ind icated by the arrow .
ADJUSTMENT OF OIL SUPPLY AMOUNT TO ARM SHAFT AND ROTATING HOOK
€1D
More oil
CID
Le ss o il
* Re mo ve the f ace pl ate , and adju st the lubrication for the arm
sh aft by turning the sc r ew 0 .
* Lower
the h ead , and ad ju st the lubri catio n for th e rotat ing
hook by turni ng th e sc r ew G.
ROTATION DIRECTION OF THE MACHINE
)
* The correct rota tin g direct ion of the m achine is
co unterclockwise as viewed from the pulley side.
* Pr e ss th e belt0 , and adjust th e belt ten sion by turn ing the nut
G so that the belt can be pushed inward about 15 - 20mm.
* When the mach ine run s id le, be s ur e to r ai se th e presser fo ot.
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* Insert the needle 0 all the way, making sure that the long
groove
of the needle is at the left, and tighten by using the set
screw
8.
J
(I) Fit the bobbin 0 onto the bobbin winder spindle 8.
(2) Push the bobbin winder stop latch 8 completely upward.
(3) After winding the thread around the bobbin 0 a few times in
the direction
of the arrow, operate the machine.
(4) If the thread cannot be wound evenly, adjust the bobbin
winder tension bracket8 by moving itto the left
or rightafter
loosening the set screw
0.
* To wind more thread onthe bobbin 0, tighten theadjustment
screw
0.
Raise thread take-up
to its highest position
iJif:f>wiliQJ•fB1~Jl\11§)._~fi m_f.liE:·-~a~o:~JIJ:t:Nc:~~~;
- ..... _ ---~ --"'' -. - - -· ·-· ·-·
(I) Raise the needle above the needle plate.
(2) After lifting the latch of the bobbin case 0, remove the
bobbin case.
(3) The bobbin 8 will come out when the latch is released.
Delivery eye
(I) Insert the bobbin into the bobbin case.
(2) Pass the thread through the slot 0 and under the tension
spring
8.
(3) Pull out the thread from the delivery eye at one end of the
tension spring
8.
J
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From the library of: Superior Sewing Machine & Supply LLC

( THREAD TENSION
o- ~
Stitches when upper t hr e ad
tension is too loose
-
Stitches when upper thr ead
tension is t oo tight
-
I deal s eam
J
More tension
* Adjust the screw 0 so that the lower thread tension is just st rong enoug h to prevent the bo bbin case from falling by its own weig ht
when it is suspend ed by holding the end of the lower thr ea d.
* Adjust th e tension of the upper thread wi th the tension contro l nut f) as sh own in the figure above after lowering the pr esser foot.
Ill Thread take-up spring
* The sta ndard op era ting rang e of the thread take-up spring is 7
~ lOmm.
The s tandard ten sion is 25 ~ 30 grams.
* To adju st the operat ing range, loosen the scr ew f) and turn
the upper thread tension assembly.
* To adjust the tension, in sert the tip of a screwdriver into the
sl
ot of the tension stud 0 ,and tu rn it as necessary.
[ ~_A_D_J_U_S_T_M_E_N_T_O __ F_P_R_E_S_S_E_R _F_O_O_T __ PR __ Es_s_u_R __ E __ __________________________ ~ )
Nut
( ADJUSTMENT OF UPPER FEED PRESSURE
* Th e press ure on materials dur ing sewing must be as weak as
possible but still enough to prevent slippage. Adjust, if
necessary, by using the adjust ment screw 0 .
* Loosen the adjustment nut before adjusti ng.
)
* Adjust the upper feed pressure by t urning the adjustmen t
upp er feed dial 0 so that the upp er feed dog will feed the
materia l fi rmly and securel y.
If you make the u pper feed pressure stronger, the upp er fe ed
efficiency will be increased.
If
you make it weaker, the upper feed efficiency will be
decrea
se d.
* Be s ur e not to make the upper feed press ur e to o st rong,
because, if it is, the upper feed dog wi ll li ft the presser foot,
causing
th e material to slip.
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From the library of: Superior Sewing Machine & Supply LLC

(
ADJUSTMENT OF FEED DOG HEIGHT ]
'----· ----------
0.8mm
!
* When the feed dog 0 is at its highest position above the
needle pl ate , the standard height is 0.8mm.
* To ad ju st the height of the feed dog 0 , move it to the highest
position above the needle plate, loose n the set sc rew 8 , and
raise or l ower t he f eed lift ing arm 0 .
ADJUSTMENT OF PRESSER FOOT HEIGHT
e
0
0
6mm
( ADJUSTMENT OF STITCH LENGTH
Feed adjustment _.......
dial assembly
-·
Model 082- 8792-003
* The sta ndard height of the pr esser foot 0 is 6mm when it is
raised by using
the knee li fter , an d locked by the presser foot
s
topper f) .
* Loo sen the nut 0 of the adjustment screw and then the
pre ss er foot adjustment scr ew e so that no pressure will be
app lied to the presser foot.
Loo
se n the set screw 0 , and adjust the presser foot heig ht by
raisi
ng or l owering the presser bar 0 .
Feed adjustment
dial assembly
Model
013 2- 8792- 013.0 15
0
*
Pr ess the reverse l ever 0 to the center posi ti on, set the numb er on the feed adjustment dial which co rr es pond s to the desired stitch
leng
th (I - 4 on mode ls 003 and 013, and I - 5 on model 015) to the" 12 o'clock" po si ti on, and then release the reverse lever0 . (When
se ttin g the reverse l ever in the cent er position, be ce rtain to pr ess it a ll the way into position.)
* The amo unt of feed be co mes greater as the number becomes l arger. The maxi mum stitch length of mode ls 003 and 01 3 is 4 mm, a nd
the ma ximum of mode l 01 5 is 5 mm . Th e maxim um stitch leng th of ba c ktack sewing, however, is approximate ly 2 mm.
Ill Reve rse-operation mec hanism
When the reverse le ver 0 is pr essed, the mat er ial will be fed in the reverse direction. Wh en the reverse leverisreleased, it will return
to its original po si tion , and the mat er ial will automati ca ll y be fed in the forw ar d direction .
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From the library of: Superior Sewing Machine & Supply LLC

(~_ A_D_ J _ U _ S _ T _ M _ E _ N _ T __ O_F_U_P_P_E_R __ F_E_ ED __ A_M __ O_U_N_T __________ ____________ __________ ~)
Upper feed adjustment dial assembly Upper feed stopper dial
Indication pin
Upper feed adjustment dial assembly
\ -- @
Feed a d justmen ~ ·
dial assembly
~ 0
,______,
Model 0 82- 8792-003 Model 08 2-8792 - 013.015
© Model 082 - 8792 - 00 3
* Pr ess the reverse l eve r 0 to th e ce nt er p os ition, and after se ttin g the de si red nu mb er ( I ~ 6) on the upper feed adjust men t dial
assembly to the " 12
o' clock" p os ition, release the r eve rse lev er O.
* Th e u pp er feed amo unt b eco m es l ar g er as the numb er becomes larg er.
Ma ximum feed amo unt = 6 mm
© Model 082 - 8792 - 013
* Align the nu mber 6 (on the upp er feed stop pe r di al) wi th th e i ndicati on pin .
Pr ess the reverse l ever 0 to the center position, and after a li gning the numb er (I ~ 6) of the uppe rfeed adj ustme nt d ial as s em bly wi th
the i ndi cation pin , release the rever se lever.
* Th e up per feed amount b eco mes gre ate r as the n umb er b eco mes larger.
© Model 08 2 -8792-015
* Align the num be r 8 on the upper-f eed stoppe r dial with th e i nd i catio n pin.
Press the reverse lever 0 to the cent er p os it io n, align the des ir ed num ber ( I- 8) of th e u pper -feed adju stme nt dia lwith the in dica t ion
pin, a nd th en re l ease the reverse l ever 0 .
* The amo unt of up per feed be comes grea t er as the nu mb er beco mes l arge r.
[~_ A_D_ J _ U _ S _ T _ M _ E _ N _ T __ O_F_S_E_W __ IN _G __ LA __ G ____ ____________________________________ ~)
Upper feed adjustme nt
dial assembly \\ .
(~
Feed adjustme nt \ r-
dl ol mo mbly 1
Mo del 08 2- 8792-003
Fe ed ad justment
dial ass
embt y
Upper
feed adjustment
dial assem
bl y
Model
082 - 8792- 013 .0 15
~
The lower material is long.
~~
Th e upper material is long.
* If the lower mat er ial is l on g when s ew ing is finished, set the u ppe r f eed ad jus t men t d i al ass emb ly to a sma ll er n um ber,o r set the feed
adjustme
nt dial assembly to a l arger num ber.
* If the upper materia l is l ong wh en se wi ng is fi nished, set th e u pper feed a dj ustm en t dial asse mb ly to a larg er n umbe r, or set th e feed
ad ju stme nt dial assembly to a s ma ll er n um ber.
* If the uppe r feed adju st ment dial is to be turned, first tur n the upper feed s topp er dial to the maximum n umbe r, and t hen turn the
u
pp er feed adj u stment dial.
* Turn t he u pper feed adjustme nt dial assembly and the feed adjustme nt dial assem bly li ttle by little to t he pl ac e wh en there is no sewing
lag.
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From the library of: Superior Sewing Machine & Supply LLC

( GATHER SEW I NG
Upper feed a djustment
dial assembly
--- - ·---...
Upper feed adjustment
assembly
0
)
Model Model DB2 8792
013.015
* Use th e gather type gauge for gather sewing.
* Use gr oup B or group L replacement pa rts for tuck sewin g.
The tuck se parato r en su r es beautifu l tuck sewing.
Gath er se wing
Ill Sew ing me th od
I. Turn th e feed adju s tment dial to set th e desired s titch length .
2. Set the upp er feed adjustment dial to a po s ition in which the
amoun t of upper feed is larger than that of t he lower feed.
3. B
ecause the amount of ga th ering differs acco rd ing to the type
of material being u sed, the l ength of th e stit ch and o th er
factors , the approp r iate amount mu st be determined and se t
by u
sing the adju s tm e nt dial.
© Partial gathering is po ssible with model s 082 -8792-013
and - 015
I. Set t he feed adjustment dia l to the des ir ed s titc h le ngth .
2.
Set the upp er feed s topper dial to th e maximum number.
3. Use th e upper feed adj us tment dial to e limin ate any s ewing
lag.
4.
When the ga th er sew in g pedal 0 is depressed. the machin e
will begin
gat h er se wing , When th e pe dal 0 is releas ed. the
mach ine will resum e normal se wing .
(Use the upper-feed st opper dial to adjust the gat h er to th e
desi r ed amount.)
* When the gathe r-s ew ing pedal is depr essed, th e material will
be sewn wi th th e amount of feed set by the upp er feed st oppe r
dial.
When the peda l is releas ed, the material wi ll be sewn with
th e amount of f eed set by the upper-feed ad justment dial.
INSTALLING THE GATHERING-SEPARATOR [Standard equipment on 082 - 8792-015]
I. Insta ll the guide bar 0 by using th e screw f) and the wa sh er 0 .
0
/
Separator-p late
(I nst a ll th e guide b ar 0 so that it is in dire ct contact wi th th e proj ecting part.)
Fig. A
Separator- pl ate
2. Fit th e se parator-plat e assemb ly 0 on to the gu ide bar. and then temporari ly tight en with th e grip sc r ew 0 .
3. Adjust th e sew ing mar gin by us ing th e grip s cr ew 0. and th en ti ghten th e grip sc rew 0 firmly.
* R efe r to figure A for th e alig nment of the front e nd of the se parator-plate.
(Install th e separ ator-p l ate so that th e needle wi ll not co me into con tact with it.)
8 -
From the library of: Superior Sewing Machine & Supply LLC

Model 082-8792-003 Model 082-8792-013, 015
I. Turn the upper feed adjustment dial assembly to set the upper feed amount to maximum.
2. Turn the machine pulley slowly.
3. The minimum clearance between the upper feed dogand the presserfoot should beapproximately 1.0 mm when the forward-pulling
type upper feed dog
is used, and 2.5 mm when the gathering type upper feed dog is used.
~ 4. Loosen the screw 0. and adjust the clearance by moving the upper feed arm f) forward or backward.
1. Needle bar lift amoung
0
i : Reference line
I '
• j
I / 2.2mm
Fig. A
* Turn the machine pulley toward you. When the need leO is at the position 2.2mmabove the lowest position, loosen thesetscrewf),
and adjust so that the rotating hook point 0 is at ·the center of the needle 0.
* Adjust so that the clearance between the rotating hook point 0 and the needle 0 is 0.05 "' 0.1 mm.
2. Needle bar height
0
•
Reference line
Fig. B
* Loosen the set screw 8. and raise or lower the needle bar 0 so that the clearance between the upper edge of the needle hole and
rotating hook point 0
is about 0.5 mm when the rotating hook point coincides with the center line of the needle 0.
* Refer to figure A for the lowest position of the needle bar 0. and to figure B to raise the needle bar 0 by 2.2 mm.
-9-
From the library of: Superior Sewing Machine & Supply LLC

~~·1i~* me~ :~i~~-~·~t~~tse ~~*a~s: ···-
~..;.:.:;__;~~- . i ' -'"---~·
1. How to remove the presser foot, upper feed dog, needle plate and feed dog
•
•
(I) Loosen the set screw 0, and then remove the needle 8.
(2) Remove the set screw8,and then remove the presserfootG.
(3) Remove the hexagonal bolt 0, and then remove the upper
feed dog
0.
(4) Remove the cap screw 8, and then remove the needle plate
••
(5) Remove the set screw f), and then remove the feed dog(!).
* For model DB2-B792-015, loosen the hexagonal bolt 0,
and then remove the upper feed dog 0.
2. How to attach the presser foot, upper feed dog, needle plate and feed dog
.. ---:~--
0
•
• r---- I -----
-~jii __ F.
Jl, ~ ~
'-8
Slide plate
•
•
(I)Temporarily tighten the feed dog(!) by using thesetscrew f).
(2) Attach the needle plate 0 by using the cap screw 8.
* Turn the machine pulley to move the feed dog(!), and then
secure it
in place, by using the set screw f), so that there are
front/back and left/right margins
in the grooves ofthe needle
plate
0.
* Confirm the height of the feed dog. Refer to page 6.
(3) Attach the upper feed dog 0 by using the hexagonal bolt 0.
(4) Attach the presser foot 8 by using the set screw 8.
* Confirm the height of the presser foot 8. Refer to page 6.
* Confirm the clearance between the upper feed dog 0 and the
presser foot G. Refer to page
8.
(5) Attach the needle 8 by using the set screw 0.
6mm
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From the library of: Superior Sewing Machine & Supply LLC