Consew 3421UX5-2 User manual

___________ IIIr:S/nce 'S.9B
DNSE
CONSOLIDATED SEWING MACHINE CORP.
I INDUSTRIAL SEWING & CUTTING EQOIPMENT
OPERATING
INSTRUCTIONS
&.
PARTS LIST
3421 5-2
L-- INDUSTRIAL SEWING & CUTTING EQUIPMENT
400 VETERANS BLVD, CARLSTADT, NJ 07072

CONTENTS
Operation instruction
I.Brief introduction ............................................................................................... 1
2.Main specification .............................................................................................. 1
3.Preparation ....................................................................................................... 1
4.Lubrication ........................................................................................................ 2
5.Trial run ............................................................................................................ 2
6.Installing the needle .......................................................................................... 3
7.Coordination between needle, thread and sewing material. ................................3
8.Adjustment of thread tension ............................................................................. 3
9.Threading ......................................................................................................... 4
10.Adjusting the stitch length ............................................................................... 4
. I1.Adjusting the thread take-up of needle thread .................................................. 5
12.Adjusting the thread tak-up of looper thread .................................................. 5
13.Adjusting the thread releasing .......................................................................... 5
14.Setting the needle safe bracket ......................................................................... 6
15.The position of needle and thread finger ........................................................... 6
16.The position of looper and thread finger ........................................................... 6
17.Setting the position of fork needle ..................................................................... 7
18.Timing
adjusting for fork needle ...................................................................... 7
19.Timing
adjusting of feed dog ............................................................................. 8
Parts Manual
1.Arm and bed ............................................................................................9-10
2.Needle Bar, Presser foot Part .............................................................11-12
3.Needle
bar moving, presser foot lifting bar .................................... 13-14
4.Lower shaft part ..................................................................................15-16
5.Low feed,
looper Part .......................................................................... 17-18
6.Fork needle swing shaft part ..............................................................19-20
7.Preeser bar, pressure cylinder part ...................................................21-22
8.Threading ..............................................................................................23-24
9.Face plate ................................................................................................25-26
10.Base cover part ....................................................................................27-28
11.
Accessories ..........................................................................................29-30

Operation instruction

11.sriefintroduction
It's high speed compound feed chainstitch sewing
machine. It's suitable for sewing medium and heavy
duty.
Special for sewing
bed cushion, carupholstery,
furniture, andetc
1
- 1 -
12.Main specifications
Application Mediun andheavy duty
Max. sewing speed 3000 spm
Max. stitchlength
8mm
Needle barstroke
36.5mm
Presser foot lifter
13mm
Needle
DVX5923#
Lubrication Oil
by hand
Motor 370WFor sewing machine
13.preparation'(Fig.1 )
1.Cleaning the machine
Before delivery, the machine parts are coatedwith
rust preventive grease, which may be hardened and
contaminatedby dust during storage and shipment.
This grease mustbe removedby clean clothwith
gasoline.
2.Examination
Though every machine is confirmed
by strict
inspection and testbefore delivery, the machine
parts may be loosed or deformed after long distance
transportation
withjolt. Athorough examination
mustbe performedafter cleaning the machine. Turn
the balance wheel to see
if there is running
obstruction, parts collision, unevenresistance or
abnormalnoise.
If these exist, adjustmentmustbe
made accordingly before run.

14.Lubrication ( Fig. 2, 3 )
Before machine running, clean itwith soft cloth, then
fully lubricatedthe holes
(Fig.3)
If the machine is in continuous operation, the
operatorshould lubricate
it no less thattwo times per
day.
Please use HA-8 sewing machine oil orHJ-7
machinery oil.
15.Trial run
Trial run is required for a new sewing machine, or
when the machine leftout of operation for long time.
Note: Before the trial run, liftthe presser foot. Run
the machine at a low speed(about 1000-1500 s.p.m.)
at beginning. As the machine runs well after 30
minutes, then increasing the speed gradually.
2
3
- 2 -

4
5
a
Longgroov
leftward
x x
b c
- 3 -
16.lnstalling the needle ( Fig. 4)
Turn the balance wheelto liftthe needle bar to its
highestposition, loosen needle set
screwl, fully
insertthe needle shankup to the bottom
of needle
socket, then tighten needle set screw
1.
Note: Fig.(b): Insufficient insertion
Fig (c): Wrong direction
oflong groove.
7.Coordination between needle,
thread and sewing material
leftorright twisted is available.
Selectionto the needle size shouldbe basedupon the
threadandmateria
IS.Adjustmentofthread tension ( Fig.5)I
l.Ifthe needle thread is too tightor bobbin threadis
too loose, turnthe upperthread tension nut
counter-clockwise to loosen the tension
of the needle
thread;
or turn the rearthreadtension nut clockwise
to increase the tension
of the bobbin thread.
2.Ifthe needle threadis too loose orbobbin threadis
too tight, turn the upper threadtensionnutclockwise
to increase the tension
of the needle thread; orturn
the rearthread tension nut counter-clockwise to
loosenthe tension
ofthe bobbin thread.

!9.Threading ( Fig. 6 )
1. Threading the needle thread
Please threading the needle thread as follows sequence: hold
1, 2 of the threadfinger -theadtension assembly
A - thread finger B - threadfinger C - four holdthread finger D - theadtake-up lever E - finger F - needle.
2.Threadthe bobbin thread
Please threading the needle thread as follows sequence:
Hold 3.4
of the thread finger -threadpipeA' -threadtension plate B' -looper threadtake-up lever C' -looper
front thread fingerD' -back holdE' -looper F'.
11 O.Adjusting the stitch length (Fig. 7)1
I.Press down the buttonAby lefthand, turn the
balance wheel byrighthand until the button goes to
the groove, then turn button to
114 roundto fix it.
2. Adjusting stitch length, please press down the
button B by lefthand, turn thebalance wheel slowly
byright handuntil the buttongoes to the groove;
turnthe balance wheel to adjustthe stitch length
while press thebuttom B. (Turn thebalance wheel
up to shortthe stitch length; turn down to long stitch
length.)
Note: Please don'tpress down the button when the
machine is running.
6
7 A
- 4 -

8
9
10
Screw
ThreadFinger
~Ll!i~~en ___ --t T~~ead take-up lever
-0 --.1/2
Screw
ThreadFinger
00 T
o
Thread releasing cap
Thread releasingplate /
Adjuting nut
- 5 -
11.Adjusting the thread take-up of
needle thread ( Fig. 8)
Adjusting the thread take-up leverand threadfinger
to increase and decrease the threadtension. When the
needle runs to
high position, loosenthe screwto
heighten the threadtake-up lever, or loosenthe screw
to
lower the thread finger, so that to increase the
thread tension. On the contrary, to decrease the thread
tension.
Normally, the
thread finger 5/8 higher then screw,
bottom of thread take-up lever 112 lower thenbuttom
of connector.
12.Adjusting the thread takeup of
looper thread (Fig. 9 )
Loosen the screw, move the thread finger rightward
or
lower the bracket to increase the amount oflooper
thread. On the contrary, to reducethe amount.
According to the material andthread stitchlength,
adjusting the
thread tension. Loosen the screw,
moving the thread finger
and threadtake-up lever
rightward and leftwardto adjust the tension. Then
tighten the screwto insure the thread take-up lever
pass the center
of the bracket.
13.Adjusting the thread releasing. ( Fig. 10)
The correct adjusting method:
Moving the threadreleasing cap to adjusting the
thread releasing, tighten the screw when finish the
adjustment. If the thread releasing can not be
obtained, please loosenthe adjusting nut, moving the
thread releasing plate to correctpostion, then tighten
the nut.

14.Setting the needle safe bracket ( Fig. 11 )
Adjusting mothed: Turn the balance wheel
count-clockwise, looperrun forwards until the looper
andcentre
of needle on one line, this time, the mark
"LT" shouldbe 1/8 inchhigher than the arrow mark
of the arm.
Then, loosen the screw to turnthe needle safe braket,
adjusting itto close the needle, butnottouch on
needle, then tighten the screw.
15.The position of needle and thread
finger. ( Fig. 12 )
The correctposition: 1/32" clearance between need
and thread finger.
16.The position of looper and thread
finger ( Fig. 13 )
The correctposition: moving the looper to front
position, there is 1/16" clearance betweenbottom
of
looper and thread finger.
- 6 -
Looper
N
eed1e safe bracket
Screw
"
--"--
"
11
Screw
13

14
Fork needle Screw
16
Screw
- 7 -
17 .Setting the position of fork needle (Fig. 14,15)
Horizontal adjusting method: when the looperpass
the fork needle, the tip
of fork needle aims the top of
looper leftgroove, and there is little clearance like
tow paper. Loosen the screw, then move the bracket
to suitableposition.
Vertical adjusting method: Whenthe needle run to
nearthe fork needle, there is 1/16" clearance
between the two tip. Loosen the screw, move the
bracketforward orrearward to suitable positon
18.Timing adjusting for fork needle (Fig. 16.)
Adjusting method: putdown the machine head,
loosen the screw
of driving eccentric cam and the
screw
of block, move the eccentric cam leftwardto
increase the amount, move
it righward to decrease
the amount. Then tightenthe screw
of driving
eccentric cam firstly, then tighten the screw
of block.