Brother CB3-B913 User manual

INSTRUCTION MANUAL
FOR
BROTHER CB3-B913
Chain Stitch Buttoning Machine
BROTHER INDUSTRIES, LTD.
NAGOYA, JAPAN
From the library of: Superior Sewing Machine & Supply LLC

©FEATURES
*Model CB3-B913 is an idea l ma chine for
se wi ng button s on to knitw ork. dre ss
shirts. workin g c lothe s, l adie s gar ment s
and ch ildren's clothing.
*
Th e number of s titche s ca n be easily
changed to
8. 16 or 32 with simple le ver
ope ration so the machin e can be u se d
in a wide
ran ge of butt on se wing work.
*T he button c lamp I S aut o matically
rai sed and lo wered for bett er s ew i ng
efficie nc y.
* A unique brake minimi zes stopping
shock
and a ss ure s a quiet stop.
*
Attachment s may be i nsta ll ed for easy
pe ar l button se wing etc.
(SPECIFICATIONS ) ........ . .... .... ..... ... ..... ...... 1
( INSTALLING) ...... .. .·· ........ ·· .. ...... · .... · ...... ...... .1
[I]. Motor Ba se ...... .... ··.. ........ ..................... ·.. ··· .. · ........ I
Mot or Pull ey ...... ............. ..· ...... . .......... ··.. ·· ...... · ........ I
~ - Sett ing up the Ma chine .... ..... .................................... I
~- Ins ta ll ing th e Button Tra y .............. .. ........ · .. · ........... 2
( LUBRICATION AND TRIAL OPERATION , .... 2
[I] . Oiling ........ .... .....· ..... · ........ . ........... · ........ .···.. ·· ........ 2
[2] . Trial Operati on ...... ·· ............ · ....... . ..................... ....... 2
(CORRECT OPERATION ) ... ................. ..... 3
. Longitudinal and Tran sve r sa l Feed Po sitioning · .......... . 3
~- Button In se rti on ·· · ........ ········.. ···· ....... ·· .. · .... ·..·· .... ·... 4
~- Chang ing the Number of Stitch es ............ . ................. 4
@. Needle an d Thr ead ......· ...... .· ........ .......· .......... · ..... ·· ·· 4
,: { l .~
· -, ·~J u"
-i~
~
· ""'
~- Needle Ins ta lling . ...... ... .................................. . ···· ····· 4
[Q]. T hreading ..... ··.. ................. ...· ........... ··· .... · ...... ··... ... 4
[1] . Thread T ension ........ · .............. · ........ ··· ......... ·.. · .. ·... 5
~- Adju st ing · eed le Thre ad Length from Needle
E
ye after Sew ing ·· ....... ····· ...... ·...··· ·· ·...··· ..... ·...·..······ 5
~ - Adjusting th e Button Cla mp Pr essu re ... · ....... · ..... · ...... 5
(STANDARD ADJUSTMENTS) ............ 5
[D. Needle Bar Hei ght Adjus tment ..... . ....... .. ....... ..···· ·· .. . 5
~ - Needle and Looper Timing Adjus tment ··· ....... . .......... 5
~ - Needle Clea ran ce Adjus tm e nt ...... ···.......··· ...... . .... ·..... 6
@ . Needle Guard Adjustmen t ................................ ·..·...... 6
~ - Thread Looper Timing Adjus tment ........................ ... 6
[Q]. Su b-T ension Adjustme nt ......................................... ... 6
[1] . Button C lamp Lift er Adjustme nt ...... . ...... . .......... ......... 6
(TROUBLESHOOTING) .... . .. .. . .... .· ··· ··. ..... .. .7
From the library of: Superior Sewing Machine & Supply LLC

(SPECIFICATIONS J
Sub-clas s - 1 I -2
Stitc h type Single ch
ain stitch, single needle,
single
thread (JIS C ll)
Speed 1,500 r
pm
Button cla mp lift S tandard 14 mm, Maximum 20 mm
Motor
4P, 25 0 W mo tor
(s ingle-or thr ee-ph as e)
Sewable button size
8 to 30 mm in ou tside diam eter
2.5 to 6.5 mm in b utton hole spac ing.
Numbe r of st itc he s
8, 16 , 32
I 6, 12,
24
Nee dle bar stro.ke
48 mm
Belt
diam e ter
6.5 mm ¢ round leat h er belt
Fla t bu tton
e @
S tit ch
Form
Nee dle TQX 1 for Aat button s
ewing
TQ X 7 for shank butt on se\\'ing
Sha nk button
2
(INSTALLINGJ
[I] . Motor Base
In case of using a co mm ercial motor, select one of th ose *In case of using a commercial t ab le. dr ill hol es as shown below.
shown below.
Powe r requirement s
Motor
Single-ph ase
4P, 250 W mot or
Three - pha se
4P, 250 W m oto r
Motor Pulley
Se l ect th e co rr ect motor pu ll ey f rom the ta ble below
which s
ui ts the power so ur ce fre qu ency of your area.
So ur ce
Machi ne
Mo tor pull ey
frequen cy
speed Outs
id e di ameter
Pulley
50 Hz 1
,5 00 rpm
75 mm N-75 pulley
60Hz 1,500 rpm 65
mm N-65 pulley
~ - Setting up the Machine
l. Pl ace the machine head on the t able , and
faste n the head with four h exagona l bolt s 0 .
n at washe rs f) . was her s 0 and nut s 0 .
- I -
0
Lf)
0
0
N
1. -,.
U')
co
0
U')
2. L oo se n the head clamp bolt 0 . ope n th e bed
cover 0 .tilt
the ma chine h ea d to the left, and
h
oo k th e chain (l) to th e c lut ch actuat ing l ever
f) .
From the library of: Superior Sewing Machine & Supply LLC

- Y
3. Loo se n the two h exa go nal bo lts 0 from the
t ab le le gs , di sco nn ec t one end of th e su pport
sh aft 4Ji) , slide th e pedal 4D and pedal st op pers
~ o nto the shaft. and tig hten the p eda l stop·
pers ~ with sc rew s.
*A dju st th e pedal position with th e suppo rt
s haft 4Ji) in the forward·backward directions,
and with the ped< tl s toppe rs ~ in s id ew i se
direction s, .ma kin g s ure that the chain wi ll
co nt act neither th e m oto r pulley nor th e ob·
l ong hole in th e tab le.
~ - Installing the Button Tray
..
4. Connect the hook til at the lo we r end of the
chain to th e p eda l,and adj u st the c hain l engt h
with
th e o th er h oo k 41) .
l. T ake th e tw o b utton tr ay l egs 0 f rom t he parts box, in se rt
them into th e mo unting h oles in the bed, and fas ten them with
the sc r ews f) .
2. Fit th e bu tton tray @ on to the butt on tr ay l egs O. and fas te n
it wi
th th e sc rew s 0 .
(LUBRICATION AND TRIAL OPERATION)
[1 ]. Oiling
Be sure to pour a dr op or two of o il in to e ach of oiling po in ts indi cated by arrows be fore st artin g yo ur se wing m ac hine.
~ - Trial Operation
1. Switch the p owe r on to s tart the m oto r, which dri ves the
pulley in the a rrow di rec tion.
*Be s ur e to ch ec k th e op erat ing d ir ec tion of th e m ac hine.
2. Th e ma chine sta rt s running when the pedal is step ped on.
3. Release the p eda l quickl y.
4. The machine sews the pre se t number of st i tch es an d st ops.
5. Th e pr esser f oo l automatic a ll y ri ses . .
R
epea t steps 2 thr ough 5 a f ew times.
- 2 -
From the library of: Superior Sewing Machine & Supply LLC

(CORRECT OPERATION)
[ []. Longitudinal and Tr ansversal Feed Positioning.
Button hole spacing
1. Two-hole button s
(1 ) Depress the l ever 0 and align the arr ow on the lever
with the ©
ma ri e
2. Four-hole buttons
(1) Depress the lever 0 and move th e a rr ow on the lever
to the position representing the bu
tt on hole sp ac ing.
3. Button holes spaced 4.0 to 6.5 mm apart .
..
Be sure to check the hole sp ac ing of the but ton s to
be sewn on
to a fabric. If the bu tto n hol es are s pa ce d
2.5 to 4.0 mm a
part from eac h other. p ro ceed as men·
tioned in steps 1 and 2. If the butt on holes ar e sp ace d
4.0 to 6. 5 mm a par t from eac h ot her. ta ke steps 1, 2
and 3.
(2) Loosen the nut
f) , and set the pointer $ to the posi-
tion representing the bu tto n hole sp ac ing.
(2 ) Loosen the nut f) , and set the pointer 8 to the pos it ion
re
pr esenting the button hole spacing.
(1) Loosen the he xago nal bolt 0 . remove the feed pl at e A f) ,
tak e the feed pl ate 8 out of the pa rt s box, and install it tem·
pora ri ly with the he xag onal bolt.
(2 ) Loosen the se t sc rew 0 . push the adjusting pl ate 0 a ll the
wa
y, and retigh te n the set screw 0 .
(3 ) Set the lever and the pointer to the positions rep re senting
the button hole sp
ac ing in the manner mentioned in Para·
gra phs 1 and 2.
(
4) With the power switch OFF , open the rig ht bed cov er, de·
p re ss the pedal, turn the machine pulley by hand and see
that the needle wi ll not hi t the edges of the opening in the
feed
pl ate.
(5 ) Aft er the feed p lat e 8 h as been co rr ectly p os itioned, tighten
the h
exago nal bo lt 0 sec ur el y.
- 3 -
From the library of: Superior Sewing Machine & Supply LLC

IZJ. Button Insertion
1. Two-hole buttons.
0
2. Four-hole buttons.
3. Sewing on same-sized buttons
continually.
•
0
(1) When the cam plate 0 is pushed, the button clamp 8 opens. Insert a button into the button clamp,
(2) Insert a button into the clamp in the correct direction as shown above, and re- and make sure that the button has been
lease the cam plate
0. securely gripped. With the button grip-
ped by the clamp, loosen the set screw
•. pull the adjusting plate e toward
yourself until there is a clearance of
about 0.5 to 1.0 mm between the adjust-
ing plate e and the screw •.
Then tighten the set screw @).
~- Changing the Number of Stitches.
Turn the power switch OFF at the normal machine stop position, open the left bed cover, and depress the pedal as you select
a desired number of stitches
as follows.
~- Needle and Thread
Needle Size of thread Kind of thread
# 9 #
100 to ;1:80 Cotton, silk
#11 #
80 to #60
II II
#14
# 60 to #40
II II
#16
# 40 to #30
,
II
#18
#
30 to #24
II II
#20 #
30 to ;!: 16
II II
Select a needle and thread by referring
to the above table.
3* Use a TQX 1 needle for sewing flat
buttons on ; a TQX 7 needle for
shank buttons.
~- Needle Installing
1. 8 stitches
The figure at left shows the case of 8 stitches.
2. 16 stitches
Pull the stitch select knob 0 toward yourself and
move it
in the arrow direction.
3. 32 stitches
(1) Pull the stitch select knob 0 toward yourself
and move it in the arrow direction.
(2) Loosen the hexagonal bolt fj, push down the
lever
@) in the arrow direction, and retighten
the hexagonal bolt
fj.
1§1. Threading
Pull the thread whtJe pressmg the button.
Hold the needle with its long groove
side 0 facing
in your direction, in-
sert the needle into the needle bar
hole all the way, and clamp it with
the screw 8
-4-
From the library of: Superior Sewing Machine & Supply LLC

[ZJ . Thread Tension
MorP.
Le
ss tension
tension
<.____>L ess tension
CJ
~a~. Adjusting Needle Thread
Length from Needle Eye
after Sewing
Adju st th e thread tension with the main To adju st remaining thread len gth fr om
tension sc rew 0 and sub·tension sc rew the needle eye . loosen the l eve r adjuster
f). screw 0 an d move the thread take· up
lever f) as ap propr iate. Th e st andar d
length is from
50 to 60 mm.
( sTANDARD ADJUSTMENTS )
[[] . Needle Bar Height Adjustment
L
·- o
Reference line for TQx 1 needle
Re ference line fo r TQ x 7 needle
~. Adjusting the Button
Clamp Pressure
@
0
Loosen the adjust in g screw 0 , and turn
the adjusting scr ew f) to adju st the
b utt on cl amp pr essure unt il it is so re·
duc ed that it can just hold the work
when the work is lightly pulle d.
After the ad ju stment. l ock th e adju s ting
sc rew 8 with the adjusting sc r ew 0 .
(I) When the needle fa ll s to the low es t position. the high est
of th e four nee dle bar reference lin es will be flu sh with
the bott om end of the needle bar lower bushing 0 .
(2 ) Rem ov e the face plate, l oo sen th e n ee dle bar ho lder
scr ew f) ..and rai se or l ower the needle ba r ~ as app r o·
priate.
l?< In ca se a TQ X 7 ne edle is u se d, the se cond lowe st of the
refere nce lines wi ll be flu sh with th e same.
12] . Needle and Looper Timing Adjustment
(I) When th e second hig he st of the ref ere n ce lines is flu sh
wi th the bott om end of th e needle b ar l ower bushing as
th e needle ri ses from its l owes t pos iti o n. the tip of the
l
ooper will be in line wi th the ce nt er of the ne ed le.
mIn ca se a TQ x 7 n ee dle is u se d. the sa me is tr ue when
th e lowe st refe re nce li ne match es the b ot t om of the
needle b
ar l ower bushing.
- 5 -
(2) Open the lo op er co ver, l oo sen the sc rew 0 . and tu rn
the looper s ha ft f) until th e. tip of the looper is in line
with
the center of the needle.
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~- Needle Clearance
Adjustment
Loosen the set collar screw 0 and move
the looper to adjust the clearance be-
tween the needle arid the tip of the looper
to
0.03 to 0.08 mm when the tip of the
looper is
in line with the center of the
needle.
!§]. Sub-Tension Adjustment
Reference line
1. Check to see that the reference line
on the needle
bar drive lever 0
matches the reference line on the
needle
bar drive lever shaft f). If
these reference lines
are unaligned,
make an adjustment by loosening the
hexagonal bolts 8 and
8.
~- Needle Guard Adjustment
Loosen the screw f) and move the needle
guard 0 to adjust the clearance between
the needle and the needle guard 0 to
about
0.1 mm.
0
0
To decrease
~-Thread Looper Timing
Adjustment
1. Loosen the screw O. and align the
reference line on the groove cam 8
with that on the looper shaft f).
2. Loosen the screw 8. and align the
reference line on the thread looper
triangle cam8 with
that on the looper
shaft
f).
IZJ. Button Clamp Lifter
Adjustment
----~-=--a.:~~
·-~~
2. Turn the pulley by hand to raise the When raising or lowering the button
needle
bar until the top of the needle clamp by means of the pedal.
bar 0 is 44 to 48 mm above the top 1. Remove the screw 0. move it into the
end of the needle
bar upper bushing hole f), and retighten the screw 0.
0. At this time, the tension disc must
begin to float. Loosen the screw 8
and turn the sub-tension stud G until
the above-mentioned timing
is ob-
tained.
*In case a TQX 7 needle is used, the
tension disc must begin floating when
the top of the needle
bar is 54 to
58 mm above the top of the needle bar
upper bushing.
-6-
2. Hook the chain 8 into the hole in the
button clamp connecting rod
e.
*The pedal and chain are optional.
From the library of: Superior Sewing Machine & Supply LLC

{ TROUBLES~OOTIN _ G )
Trouble I I Cause I I Check point I I Remedy I
Page l
Button ins erted
Inse rt button so its
imprope rl y.
Button ho le dir ection. h oles ar e in the cor re ct
direc ti on.
Longitudinal feed lever
Longitudinal fe ed l ever
Adju s t lon g itudin a l
and po int er p os ition ed f eed leve r and po in ter
improperly.
and pointer positions.
to b utt o n ho le sp aci n g.
Needle breaks.
Wrong thread loop er
Thr ead lo oper timing. Adjust
thread loop er
timing. timing.
Wrong n ee dle an d Needle and looper Adju st ne edle an d
l
ooper timing. timing. looper timing.
T oo g r ·eat a clearance Adjust c le aran ce
between n ee dle and
Needle clearanc e.
betwe e n n ee dle a nd
l oo per.
l oope r.
Needle bar hei ght
Needle bar height. Adjust needle bar
incorrect. height.
Stitches skip.
T oo g r ea t a cle aranc e Clearance between
be tween ne ed le a nd
needle and needle guard. Adju
st needle gua rd.
ne ed le guar·d.
Remaining thread Remaining thread Adjust remaining
length too short. length. t
hr ea d len gth .
Sub-tension di sc floats
Ten sion di sc float. Adjust s
ub- te nsion disc
improperl
y.
float.
Stitch es loose.
Sub -tension too weak. Sub-tension tensio n.
Adju st sub-tension
tension.
Needle installed
In s tall n ee d le with its
Needle dire ction. l
on g g r· oove facin g
inc orrect l y.
fron t.
Sub-tension di sc fl oat Tension disc flo at
Adju st sub-tension.
timing
wr ong. timing.
Thr ead breaks.
Needle too thin for Needle
and th ea cl.
R efer to in st ructions
thread. for needle
and thr ead .
- 7-
From the library of: Superior Sewing Machine & Supply LLC

~--·
•.
118-913
192913-1-02
Printed in Japan
From the library of: Superior Sewing Machine & Supply LLC