Brother DB2-B792-100 User manual

INSTRUCTION MANUAL
FOR
BROTHER DB2 - B792 - 100,-200,-500,-600
SINGLE NEEDLE ADJUSTABLE TOP AND BOTTOM FEED
LOCK STITCH MACHINE With AUTOMATIC THREAD TRIMMER
[~= M = A = ~ = H = ~ = N ~:= s = P = E ~ C = IF = IC =A= T = I = O = N = S ==========~==============================~ ]
* Au to thread trimming machine DB2- B792 h as th e fo ll ow in g specifica ti ons.
$BROTHER INDUSTRIES LTD .
DB2 -
B792- ODD
MADE IN JAPAN j-"'
I
ODD
103 I 203 503 I 60 3
11 3 613
Thread trimmer S in gle n ee dle lock stitch m ac hine
Thr
ea d wiper
------ ~ Soleno id (b uil t-in face plate) I
Quick rever se
--
Pn eumatic
---------------
Pn eumat ic
--
P resse r foot li ft
-----
Pneumatic
~
Pn euma ti c
Shi
rr ing d ev i ce Included
[~= N = A =M= E == O = F =M= AJ == O = R ~ P = A ~ R = T ~ S ========~==============~~==~========== ~]
Thr c dw i pcr
Sy nchronizer
Presser foot li ft
* Wh en you hold th e mac hine, do not hold th e
sy nchroni ze r.
Thread trim me r
Thread wi
per
Sync hr oni ze r
(}
6
Presser foot lift
From the library of: Superior Sewing Machine & Supply LLC

[~= CO = N = N = E = C = TI = O = N = O = F == W = IR = E = S ======~====~========~============== ~]
* You pas s the plug through the wire hole on the table, then install as following figures.
© For motor MD -932.
®
~
-100 -2 00
g
A
plu g 0 0
B plug 0 0
C plu!!
~
~
D plug
~
~
- 500 -600
0 0
0 0
0 0
0 0
* Take care to keep the wires away from the r otat ing parts.
* You must turn power switch off before insta ll or removal the
plug.
ttl Conn ec tion of th e ear th wire
Y ou surely pass the earth wire 0 into the wire hole on the
table from the head hin ge 8 , then in sta ll to the motor
table.
(There is
th e green wire in the parts box.)
[~= C = O = N = N = E = C = T = IO = N == O = F = A = I = R == T ~ = U = BE == ( = Fo = r = - = 5 = 00 = , =~= 0 = 0) ==== ~ ~==========~~==========~]
3-S mm
Less M ore
pressure pressure
~
- 0
0
* Tigh ten and install the air hose of the compressor to the va lv e box base 0 .
* Pass the air tube 8 of the valve box into the wire ho le on the table, then tighten and insta ll to the reverse cy linder co n-
nec
tor @ .
* Insta ll the air tube 9 to presser lift cy linder connec tor @) .
* Remove nut (3 and sleeve fj , then fix as above fi gure. (T ig ht en the nut (3 by your fin ge r and then tighten by turning
the nut once or twice by the spanner.)
Ill Adju st ing air pr ess ur e
Air pressure is 5 kg /c m2 ± 0.5 kg/cm2 in use. In case air pressu re is low , loosen the n ut ~ and then turn the handle 0 to
righ t.
In case air pressure is high, once turn the handle 0 to l eft, then operate actuater or treadle to lower air pressure in
cylinder, and
th en adjust again.
* After adjusted, tighten and install the nut ~ .
If
water s tay in the bott le 4D> , s top the co mpre ssor to lower air pressure, raise the drain cock 4D and then let o ut water.
[~ P ~ R ~ ET ~ EN ~ SI = ON == ==========~~ == ======~== ====== ==~]
* Adjust the nut 0 so that the pretension may leave the
thread of abo ut 35 - 40 mm on the needle top after the
th read is trimmed.
From the library of: Superior Sewing Machine & Supply LLC

[ OPERATION OF TREADLE PEDAL
®
@ 1 ----~ ~ ~~ ~ --
Ill Trea dl e (- 100, - 200)
1. Make sure whether slow speed motor runs smooth l y, pressing the treadle pedal 0 lightly to ®.
Pressing the treadle pedal 0 again to @ , then high speed motor runs.
]
@
2. Make sure whether the sewing machine stops at the needle down p os ition, the treadle pedal 0 is positioned at the neutral
(when
you release the treadle pedal 0 ) @ after pressing the treadle pedal 0 at the front.
3.
In case the treadle pedal 0 is pressed at the rear end @(o r back at the neutral @ after the treadle pedal 0 is pressed at
the rear end @), thread trimmer is once t urn and the needle is up and then the machine is stop.
Ill Treadle (- 500 , -600)
1. Lightly depress the upper plate f} of the treadle pedal 0 to position @, the presser f oo t co me s down.
2. Make sure whether sl
ow speed motor runs smoothly, pressing the treadle pedal 0 lightly to®.
Pressing the treadle pedal 0 again to @ , then high speed mot or runs.
3. Make sure whether the sewing ma chine stops at the needle down position, the treadle pedal 0 is positioned at the neutral
(when
you release the treadle pedal 0 ) @ after pressing the treadle pedal 0 at the front.
4. When the
upper plate 8 of the treadle pedal 0 is positioned at ® , presser foot lifts up .
5. In case
the tr eadle pedal 0 is pressed at the rear end @(o r back at the neutral @a fter the treadle pedal 0 is pressed at
the rear
end @), thread trimmer is once turn and th e needle is up and then the machine is sto p.
[ ADJUSTING SYNCHRONIZER
Adj u sting position of thr ead trimming signal
Needle down pos ition
Needle up posi tion
1 8-22 mm
9-11 mm
---
~
1) Turn off the power switch by all means. (In case of adjust each the hole l.C, turn of f the power switch by all means.)
2) Remove th e cover of the synchronizer.
3) Turn the pulley towa rd yo u and p la ce the needle bar lowest position. At th is tim e, the magnet 0 must be in line with
the t
hr ead trimming the ho le I.C 8 .
In case of the magnet 0 is not in line with the thread t ri mming the hole I. C 8 ,loosen clamping screw @) and adjust by
moving the
thr ead trimming the hole I.C.
(4) Turn on the power switch a nd stop the machine at the needle down position. At this time, the needle bar should stop at
the position of I
8- 22 mm above the upper face of the needle plate.
If the needle bar
is not stop at the fi xe d position, loosen cl amping screw 0 and adju st by moving the nee dl e down the
hole I.C @ .
(5) Stop the ma chine at the needle up position. At this tim e, the needle point should st op at the position of 9 - I I mm
above the
upp er face of the needle plate.
If the needle
po sition is not s top at the fi xed position, loosen clamping screw (3 and adjust by moving the needle up
the ho
le I.C f} .
* Ym.1 move the hole I.C @ , f} to the machine rotating direction, then the needle bar is down. Wh en yo u move the hole
I.C @ ,
f} to the rever se direction, then the n ee dle bar is raised.
0
0
* For prevent the bobbin run idle wh en thread trimmed,
there
is the bo bbin presser O.
* Wh en thr ead trimmed, loosen cla mp ing screw 8 and adju st
by moving the bobbin presser 0 back or fo rth .
From the library of: Superior Sewing Machine & Supply LLC

ADJUSTING PRESSER
FOOT LIFT (-500 ,- 600)
[~= A = D = JU = S = T = IN = G == T = R = E = A = D = L = E = P = E = D = A = L ~=======~]
~ ~
Lightly O ~
~::; .r.::
0 H
eavi ly A 0 •
· ~ ~..,~ C:::J 9
Lightly 1 Heavily
L- O
* Turn the kn ob 0 and adjust the lifting up speed of the
presser fo
ot.
1. Adjusting its weight at sl ow speed se wing
Slow speed sewing
is done when you put your foot on
the treadle pedal and slow speed sewing is not done wh en
you press the treadle pedal lightly. In such cases, loosen
the nut 0 and adjust by turning th e bo lt 8 .
2. Adjusting its weig ht at b ack
Loosen the nut @) and a dju st by turnin g the bo lt 0 .
[~= C = H = A = N = G = IN = G == T = H = E == K = N = IF = E == ~================== ==== ~==~ ============~]
08
Abo "' ~
About0.5 mm
0
f)
The ax is of th e needle
Rotary hook TI1e knife
How to remove th e knife
(1)
Turn off the power switc h.
(2) Turn the pulley and place the needle at the highest position and then
remove the needle plate.
(3)
Turn the pu ll ey and place the needle at th e lowest po siti on.
(4) Tilt the ma chine head back.
(5)
Loo sen the clamping screw 0 and remove the thr ead trimming
cover 8 -
(6) Push the thread trimming sto pp er @) with your fi nger and turn the
pull ey toward yo u until the position of you may remove the screw e
w ith ease.
(7) Remove the scr ew eI kni fe ~ I spacer (3 and lower thread finger fj .
3:!~ After the knife ~ is changed, install them reverse order.
H ow to insta ll the knife
* Let th e point of the knife ~ m eet with t he needle, turn the pu ll ey
rever se ly with yo ur hand and make sure that point of the knif e ~ may
be positioned at th e axis of the needle as figure. Then tigh ten the
scr ew e for the clearance b et ween the lower t hr ead finger fj and the
knife ~ to be 3 mm.
* Make sure that the clearance between the knife ~ and lower thr ead
finger fj and that between lower thread finger fj and th e h ook is
abo ut 0.5 mm. (Eno ugh for usable thr ead to pass smoot hl y.)
* Turn the pu ll ey t owa rd you and ge t the knife ~ at it s o ri ginal position
so th at the kni fe ~ is not touch at the needle.
@ BROTHER INDUSTRIES, LTD.
-
NAGOYA , JAPAN
117-792-100, - 200,- 5 00 ,-600
192792 -0 -1 2
Pr
inted in Japan
From the library of: Superior Sewing Machine & Supply LLC