Consew CN3115RB-1 User manual

CONSOLIDATED SEWING MACHINE CORP.
L INDUSTRIAL SEWING & CUTTING EQUIPMENT
lnstructi n & Parts
. Manual
From the library of: Superior Sewing Machine & Supply LLC

Intentionally left blank
From the library of: Superior Sewing Machine & Supply LLC

Contents
1. Brief introduction ··· ·. ·.................···· .. · .. ·· .... ·........·......................·· .. · .. ··················· .. ·· .. ·.. I
2. Main specifications ....................············......·· .... ·.....·................···.....·············· .. ···....···· 1
3. Installation and preparation ··· .. ······.......· ··.. · .. ········.......· .. · .. ·....··········· .. · .. ·· .. ··......······· I
3. 1. Installation ·..·..·· .... · .................. ··..·..· .... · .... · ........ ·..· .... ··..·· .... · .. · ............ ··..·..···· .. ···· ...... · .. ·.. 1
3. 1. 1. Location of sewing machine ·· .. ··..·..·.. ···..···..· .... ·..·..· ........ ·· .... ·..················..·..···· .... · .... ········· 1
3. 1. 2. Installing drip pan .. ·..·· .... · .... · ...... ·..·..· ........ ·········· .. ······· ...... ·.. ··.. ·..·· .. · .......... · ................ ·.. I
3. 1. 3. Mounting machine head ··· .... ········..···· .... ······..···..· ...... ·..·..· .... ·..·..····..····..··· ... · ·· ····..·· ....... · ·.. 1
3.1.4. Installing bobbin winder ...................................................................................................... 1
3. 1. 5. Mounting knee lifter ..···· .... ··..·······..· .. ····..·..·· .... ·..···· ...... "· ..···· .... ··..·······..·········..· ...... · .. · ·" 2
3. 2. Preparation ..·..·· .. · .. · .... · .. · .... ·····..·..·..·..· ...... ··· .. ·..· .... ·· ...... · .... ····..·•·· .... ·····..·..·..·· ........ · .... · ·.. 2
3. 2. 1. Cleaning machine · .... · .. · .... ·····..·..·.. ·..· ...... · .... ····· .. ·······..· .... ·..·..· .... ·· .. ····..·· .... ·" .... ···..· .. ···· 2
3. 2.2. Examination ···.. ·" ······ .. ··..·..·..·..······..·····..·· .... · ........ ··..···· .. " ·········· .. ····..·· .... · .... ·· .... · .. ·· ·.. 2
3.2.3. Oiling ........................................................................................................................... 2
3.2.4. Trial -run ..................................................................................................................... 3
4. Operation ........................................................................................................................ 3
4. 1. Selection of sewing thread .. · .... · .... ·· .... ··· .. ·· ............ · .... ········ ...... ·..··· .... · .... · ...... · .. ·· .... ·..· .......... · 3
4. 2. Installing needle · .... ····..· .... ·····..····..····..··· .... ·..·..·· .... ······ .. ·······..· .. ·..·..········· .... ··· ...... ······· .... · 4
4. 3. Threading needle thread and drawing bobbin thread ................ ·· .. ·· .. ···..· .......... ··· .. ·..·..·· ...... ··· .. · .. ·· 4
4. 4. Winding bobbin thread ············..·..·..·..· .. ···· .. · .. ·..·..· .. ·..·..·..·· .... ·· ...... ··..····..·..·..·..· ............ ··· .. · 4
4. 5 . Replacing bobbin ·..· .... ··..··..·· .... ··..·..···..· ...... ·..·..··..· .... ··..· .... ···· .... ·· .. ·· .... ·..··· .... · .. ·· .... ·..··· .. · 4
4. 6. Adjusting thread tension ··· .... ··..·..·..·..··· .... · .... ·· .... ·· .......... · .... ··..· .. ·· .... ····· .... ··· .... ·· ...... · .. · .. ···· 5
4. 6 .1 . Adjusting thread take -up spring ..······..········..·· ...... · .. ··· .... ·..·..·..·····..······..·..····..·· ........ ··· .. · 6
4. 6. 2. Adjusting tension of needle thread and bobbin thread ........ ··..· ........ · .............. · .. · .. · .............. · ...... ·· 6
4. 7. Adjusting stitch length ..... ·· .. ·· .. · .... ·· ...... ·· .... ·..· ...... · ................ · .... ··· .. · .... ·..· ...... · ...... · .... · .... · ·.. 8
4. 8. Adjusting pressurt of presser foot .... ·· ............ ·· .... ·..· .... ··..·..· .... ··· .... · ...... ·· .... · .... · .. · .... · .... ···· .... ·.. 8
Parts catalog
1. Arm with Bed ......................................................................................................... 9-11
2. Needle Bar and Thread Take-up Mechanism ................................................... 12-13
3. Shuttle Mechanism ................................................................................................ 14- 15
4. Feed Mechanism .................................................................................................... 16- 17
5. Stitch Length Regulating Mechanism .................................................................. 18- 19
6. Presser Foot Mechanism ....................................................................................... 20-21
7 . Bobbin Winder ·· ··...··· .. ····....······ ·· ····· .. ···· .. · ·· ..... ··· ····· .. · .. ·............· .. ·· · ·· ... · .. ·...··· .. · ·· · 22- 23
8 . !(nee Lifter .. ···· .. ··· .. ··········· .. · .. · .. ············· .. · .. · .. ······· .. · .. ··· .. ····· .. ····· .. ····· .. ·· .. · .. · .. · ... ·· · 24 ~ 25
9. Thread Unwmder .................. ·· ..................................................................................... 26
10. Accessories ................................................................................................................... 27
From the library of: Superior Sewing Machine & Supply LLC

l.BRIEF INTRODUCfiON
This sewing machine is a low speed, single needle 2 - thread lockstitch industrial sewing machine designde for
sewing a wide variety of products including apparel, caps & shoes, luggage, leather articles and canvas products.
The machine adopts lind thread take - up, shuttle for thread looping, lever type reverse feed and dial for stitch
length·adjustment; and is provided with knee lifter mechanism. So the stable running, beautiful and uniform and tidy
stitch form and convenient operation can be guaranteed.
2. MAIN SPECIFICATIONS
1. Max.sewing speed
2. Max.stitch length
3. Presser foot lift
4. Max . thickness
5. Needle bar stroke:
1600 spm
5 mm
6.5 mm
6.5 mm
37.4 mm
6. Working space:
7. Needle
8. Size:
9.N. Weight:
10. Motor power
3.1NSTALLATION AND PREPARATION
3 . 1. Installation
3 . 1. 1. Location of sewing machine
260x 130mm
#9- #21(16x73)
525 x 178 x 340mm
28.5 kg
0.37 kw
To ensure a smooth running,'the machine should be located on rigid and flat floor, seating machine stand on rubber
mat could further reduce the running noise and vibration.
3 . 1.
2. Installing drip pan
Fix drip pan 10 into table cutout and drive wire nails 11 into both sides of the cutout (see Fig. 1 )to secure the drip
pan.
3
.1.3. Mounting machine head
Make hinge connections 1 of machine head (see Fig.
2.) engage with hinge plates 2 of the table, than turn the rna-
chill(~ head to seat it on the ftame of table cutout.
3. 1. 4. Installing bobbin winder
After mounting the machine and belt,install the bobbin winder. Align bobbin winder pulley 1 with the outside of
belt
2( see Fig. 3), have a suitable clearance between pulley and belt, and keep the winder pulley in close contact with
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the belt as the bobbin winder stot latce lever 9 is pressed down, then, secure the bobbin winder on the table with wood
screw
4.
1
2
Fig. 2 Fig. 3
3. 1. 5. Mounting knee lifter
Mounting the knee lifter
(see Fig .4. ) in the following order:
1) Keep the knee lifter lifting bracket hook 2 engage with knee lifter bell crank on the under side of bed . The
length of the lifting bracket hook could be adjusted, hut make sure that the lifting bracket hook may not slip off the hell
crank as
in sewing operation, then, secure rock shaft hanger 1 with wood screw 12.
2) The position of knee plate 3 could be adjusted according to operator's stature to insure convenient operating,la-
hour
Fig. 4
3.2. Preparation
3. 2. 1. Cleaning machine
Before
start the machine, wipe off rust preventive grease and dust carefully with clean and soft cloth soaked with
gasoline.
3. 2. 2. Examination
Before leaving the factory, each machine
is comfirmed by strict inspection and test , but some parts may he loos-
ened due to jerk during a long distance transportation. So, a thorough examination must he performed after cleaning the
machine.
Turn the balance wheel by hand to observe the motion of each mechanism. Make sure if there is any parts col-
lision, uneven resistance
or abnormal noise. Trial runcan he started only after any trouble detected is resolved.
3.2.3. Oiling
The machine is lubricated by oil dropping. At least once per day , drop HA- 8 sewing machine oil or HJ- 7 ma-
chine oil
(light spindle oil)into the points indicated by arrows in Fig. 5.
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3.2.4. Trial- run
Trial- run is required before a new machine or a machine left out of work for a long time is put into service. Lift
the presser foot and make the balance wheel rotate counterclockwise (view from right side
of wheel). At first, run the
machine at lowspeed,
then, if the running is well, gradually raise the speed up to 1,600 rpm, several minutes later,stop
the machine and check condition of each mechanism. The machine can be put into service only when every mechanism
is under normal
con-ditions.
4.0PERATION
4. 1. Selsction of sewing thread
This sewing machine can perform sewing operation
on various materials including coarse cloth canvas, sheepskin,
light or
medium- heavy leather and synthetic leather. It's sewing thickness comes up to 7 layers of synthetic leather 1
mm
thick.
The best selection of sewing thread is cotton thread, if synthetic fiber thread such as nylon of polyester fibers
thread is to be used, sewing speed should be reduced accordingly.
In common practice, the thicker the material the
coarse the sewing thread.
The selection of sewing thread, taking cotton thread as example, should range from 42 count
X 3 ply to 32 count X 6 ply.
Fig. 6
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4. 2. Installing needle
Turn the balance wheel until the needle bar reachs to its highest position, loosen needle clamp screw 1 (see Fig.
5), while keeping the long groove of needle facing the left, insert the needle shank into the hole of the needle bar bot-
tom end as far as it will go, then tighten needle clamp screw 1.
4. 3. Threading needle thread and drawing bobbin thread
Threading should be done when needle bar 1 at its highest position (see Fig.
7.). Place the thread spool on spool
pin
2, draw out the thread tip and pass it in the following order as shown in Fig. 7.
1) Through thread retainer 3 on the top.;
2)downwards and around between tension discs 4;
3)upwards through the loop of thread take- up spring 5,from right to left undr slack thread regulator 6,upwards
through thread guard 7, upwards from right to left through eyelet on thread take -up lever 8;
4) downwards through thread guard 9 and 10, and needle clamp thread guard 11 on needle bar, from left to right
through eye of needle 12, then, draw about 100 mm
of thread through needle eye with which to start sewing.
To draw the bobbin thread, hold the tip
of needle thread by hand, turn the balance wheel to lower the needle bar
and then lift it to its highest position, pull the needle thread to that the bobbin thread is drawn up.At last, place the tips
of needle
and bobbin thread toward front under presser foot.
2
Fig. 7
4. 4. Winding bobbin thread (see Fig. 3)
Install bobbin 5 on bobbin winder spindle 6, make the pin en spindle set in the notch on bobbin. Pass the thread
fr~m spool through hole of bracket 7 and around between tension discs 8, then wind the end of the thread a few turns
on bobbin
5. Push down the bobbin winder stop latch lever 9. the winder is thereby on driven position. Start the ma-
chine
so that the winding motion begins. when the bobbin is fully wound, the bobbin winder stop latch automatically
stop sthe winding motion.
4 .5. Replacing bobbin
Turn the balance wheel in the direction of arrow shown in Fig .7 until needle bar 1
is at highest position, then;
1) With left hand beneath machine bed, open bobbin case latch lever 1 by forefinger and hold it together with
thumb (see Fig.
8), pull out bobbin case 2. Release the latch lever and the emptv bobbin will drop out of the bobbin
case (see Fig.
9). Place wound bobbin 1 into bobbin case 2 (see Fig.IO), let the thread tip be out of the case. Then,set
the thread tip into the slot on bobbin case 2 and under the tension spring 3, in the center of the spring notch (see Fig.
11) . Draw about
lOOmm of thread out of the bobbin case with which to start sewing.
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3
Fig. 8 Fig. 9
Fig. 10
Fig. II
2)While holdin bobbin case latch lever 1 with forefinger and thumb(see Fig.S)to make the latch catch the wound
bobbin,fully press in bobbin case 2 onto center stud 3 of shuttle 5 , turn the balance wheel to make sure that bobbin
case latch 4 is locked on the groove of center stud 3.
4. 6. Adjusting thread tension
The tension of needle thread and bobbin thread is varied with factors such as the nature of material and the thick-
ness of thread.
In practice, the thread tension is adjusted with reference to the stitches having been sewed, so as to obtain correct
stitch,
The possible appearance of stitches is shown in Fig. 12.
(a) Normal stitch, the twist of needle thread and bobbin thread lies at the midst of the material.
(b) If needle thread is too tight and bobbin thread is too loose, the twist will lie on the upper surface of the mate-
rial.
(c) If needle thread is too loose and bobbin thread is too tight, the twist will lie at the back side of the material.
(d) If both needle thread and bobbin thread are too loose, the thread will float on the surface of the material,
though the twist is at the midst of the material.
(e) If both needle thread and bobbin thread are too tight, the thread will embed tightly in the material, though
the twist is at the midst of the material.
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From the library of: Superior Sewing Machine & Supply LLC

(a)
(b)
(c)
(d)
(e)
Fig. 12
4. 6. 1. Adjusting thread take -up spring
The standard tension of thread take- up spring is 20g. The swing range of the spring is 7- 10mm. For very light
material( with short stitch) ,increase the swing range, while for very heavy material, decrease the swing range.
To adjust the swing range of thread take -up spring, first loosen set screw 1 (see Fig. 13) , turn thread tension
regulator 2 clockwise to increase the swing
rang, or counterclockwise to decrease the swing range. After adjustment,
tighten the set screw.
Normally, the thread
take- up spring is properly adjusted before leaving the factory. Re -adjustment is needed
only in case
of special materials or special threads.
2
Fig. 13
4. 6. 2. Adjusting the tension of needle thread and bobbin thread
The normal stitch is shown in Fig. 12 (a). When abnormal stitches occur, the tension of needle thread and bob-
bin thread
must be adjusted accordingly.
If needle thread is too tight and bobbin thread is too loose, turn the tension regulating thumb nut counterclockwise
to decrease the needle thread tension
and tighten the regulating screw of bobbin case spring to increase the bobbin
thread tension(see Fig. 14)
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If needle thread is too loose and bobbin thread is too tight, turn the tension regulating thumb nut clockwise to in-
crease the needle thread tension and loosen regulating screw of bobbin case spring to decrease the bobbin thread tension
(see Fig.l5).
In case of stitches as shown in Fig. 12 (d), (e), adjustment could be made with reference to above means.
Fig. 14
Fig. 15
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4. 7. Adjusting stitch length
Stitch length should be selected according to the nature of the material. Generally, longer stitch is selected for
sewing heavy materials and
shorter stitch is selected for sewing light materials.
Stitch length ean be set by turning feed regulating dial 1 of feed regulating screw ( St:<y Fig. 16). Turn the dial
counterclockwise to increase the stitch length or turn the dial clockwise to decrease the stitch length. Backward feeding
will st,art
and continue as long as the feed reverse lever 2 is depressed. When releasing the hand, lever 2 will return to
its original position automatically
and forward feeding is restored.
(
fig. 16
4. 8. Adjusting pressure of presser foot
Pressure
of presser foot should be adjusted in accordance with nature of materials. For heavy material, increase the
pressure by turning pressure regulating
thumb screw on the top of arm in the direction of arrow as shown in Fig. 17
(a) ,for light material, decrease the pressure by turning pressure regulating thumb screw in the direction of arrow as
shown in Fig. 17(b).
Pressure should be as light as possible while still sufficient to insure correct feeding of material.
•
a b
Fig. 17
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Parts Catalog
From the library of: Superior Sewing Machine & Supply LLC

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From the library of: Superior Sewing Machine & Supply LLC

1. Arm with Bed and Its Accessories
Item Description pes.
1 Arm 1
2 Bed 1
3 Arm screw
(front)
2
4 Arm screw
(back)
2
5 Arm dowel pin 2
6 Needle bar connecting stud roller guide 1
7 Screw 5
8 Arm shaft flanged bushing
(front)
1
9 Arm shaft flanged bushing
(front) set screw 1
10
Arm shaft bushing (center)
1
11
Set screw 2
12
Oil pad 2
13
Arm shaft flanged bushing (back)
1
14
Arm shaft slanged bushing (back) oil drip plate 1
15
Arm shaft flanged bushing (back) oil drip plate screw 1
16
Thread take up mechanism oil tube assembly 2
Feed forked connection oil tube assembly 1
Arm shaft flanged bushing (back) oil tube assenbly 1
17
Arm shaft bushing (center) oil tube assembly 1
18
Needle bar bushing (upper)
1
19
Needle bar bushing (lower) 1
20
Needle bar bushing set screw 2
21
Arm spool pin 1
22
Arm side cover 1
23
Arm side cover thumb screw 1
24
Trade mark plate 1
25
Face plate 1
26
Thread take up lever guard screw 2
27
Thread take up lever guard 1
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Item Description pes.
28
Thread guide 1
29
Thread retainer 1
30
Thread retainer set screw 1
. 31
Thread guide nut
1
32
Thread ruide 1
33
Thread guide (lower)
1
34
Thread guide (lower) screw 1
35
Thread guide (lower) screw washer 1
36
Tension, complete 1
37
Tension releasing pin 1
38
Thread take up spring regulator 1
39
Thread take up spring 1
40
Tension.srud 1
41
Tension disc 1
42
Tension releasing disc 2
43
Tension spring I
44
Tension regulating thumb nut
1
45
Tension set screw 1
46
Arm side cap 1
47
Arm side cap screw 1
48
Throat plate 1
49
Throat plate screw 2
50
Shuttle race slide 1
51
Shuttle race slide spring 1
52
Shuttle race slide spring screw 2
53
Trade mark plate 1
54
Name plate 1
55
Trade mark plate rivet 2
56
Name plate rivet 2
57
Arm shaft flanged bushing (front) oil tube assembly 1
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Intentionally left blank
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2.
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2. Needle Bar and Thread Take- up Mechanism
Item Description pes.
1 Needle bar crank 1
2 Needle bar crank position screw 1
3 Needle bar crank set screw 1
4 Thread
take- up crank 1
5 Thread take -up crank wedge 1
6 Thread
take- up crank wedge screw 1
7 Thread
take- up lever 1
8 Thread take -up lever hinge pin 1
9 Thread take -up crank screw 1
10
Thread take- up lever link 1
11
Thread take -up lever link hinge pin 1
12
Set screw 1
13
Needle bar connecting link 1
14
Needle bar connecting link cap screw 1
15
Needle bar connecting stud 1
16
Needle bar connecting stud roller 1
17
Needle bar 1
18
Needle bar connecting stud set screw 1
19
Needle clamp 1
20
Needle clamp screw 1
21
Needle bar thread guard 1
22
Needle bar thread guard screw 1
23
Needle 1
24
Arm shaft 1
25
Balance wheel 1
26
Balance wheel set screw 2
27
Arm shaft screw 1
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3.
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From the library of: Superior Sewing Machine & Supply LLC