Global SM 7774 Manual de instrucciones
SM 7774 Cp1 THREE NEEDLES SEWING MACHINE
OPERATING INSTRUCTION MANUAL
Rev 201101
Thank you very much for your choice of this double thread side
seam sewing machine. Please read the manual carefully before use!
Main Warnings:
❤It is extremely important that the electrical device must be soundly earthed!
❤It is absolutely forbidden to remove any protection system provided by manufacturer while
machine is on!
❤Allsettingandreplacementoperationmustbecarriedoutonlybythequalifiedexpert
personnel!
❤For repairs, all tools and replacement parts must be qualified by manufacturer!
❤Whenever, and whatever reason, the machine is to be demolished, certain basic rules must be
observed to safeguard public health and the environment in which we live!
Ensure that the rotation of the pulley conformable to
the red allow on the belt cover！
Notice:Replace or installation motor belt should pay
attention and v-belts can not be adjusted too tight,
synchronous belt can not be adjusted too loose!
CONTENTS
1. MACHINE DESCRIPTION ……………………………………………………………1
2. TECHNICAL FEATURES OF THE MACHINE ……………………………………1
3. PREPARATION READY FOR USE ……………………………………………….…1
4. THE ADJUSTMENT SETTING OF THE MACHINE ………………………
…
…2
4.1 The adjustment setting of the awls’ height ……………………………………………….2
4.2 Position setting of eccentric cam of hook needle movement …………………………….2
4.3 Position setting of hook need bar ……………………………………………………….3
4.4 Position setting of the eccentric cam of needle transporting …………………………….3
4.5 Position setting of the eccentric cam of needle protector movement …………………….3
4.6 Adjustment setting of the space between presser foot and needle plate ………………….4
4.7 Assembly and adjustment of the thread winding rod …………………………………….4
4.8 Adjustment setting of the stitch length ………………………………………………….4
4.9 Adjustment of stopping position ………………………………………………………….5
5. THE THREAD, AWL AND HOOK NEEDLE ……………………………………5
6. PARTS DRAWING ………………………………………………………………… 6-11
1
1. MACHINE DESCRIPTION
This is a chainstitch sewing machine with three needles (can be sew also with one or two
needles). It is suitable for sewing the upper of various shoes, as safety, working, military boots. It is
droved by a servo motor. Its operation is so easy.
2. TECHNICAL FEATURES OF THE MACHINE
Sewin
g
s
p
eed: Ste
p
less s
p
eed re
g
ulation
Stitchin
g
thickness: 0.8-6mm
Stitch len
g
th: 2-6mm
Needle s
p
acin
g
: 2.4mm/3.15mm
Motor: 560W/380V Three-
p
hase
Net wei
g
ht: 165K
g
Machine dimensions: 106×65×135c
m
（L.×W.×H.）
3. PREPARATION READY FOR USE
(1) After machine installation, connect the machine cable with the main electricity supply
(controlling that the voltage and frequency of the main supply line are the same as those supply to
motor.) and connect the filter-reducer unit to the compress air supply(pressure to be set for this
machine – 6 bar).
(2) Start pedalswitch on the machine to watch if the rotation of motor is conformable to the red
arrow on the belt cover . If the direction is opposite , switch in the other way round. Then operate
the pedal in three different movement(Fig 1)
-- Stepping on forward (Position A) means advance. Stepping on lightly is slow and Stepping on
heavily is fast. Avoid stepping on heavily at the very beginning.
-- Stop in the neutral position
-- Stepping on backward (Position B) means lifting the presser foot.
AB
Fig.1
2
4. THE ADJUSTMENT SETTING OF THE MACHINE
The machine is already adjusted all right at the assemble plant. Normally, the machine can be
used directly. At the period of use, some parts need to be adjusted according to sewing material. The
way to adjusting is described as follows.
4.1 The adjustment setting of the awls’height (Fig.2)
At first, please install the awls correctly; then turn the handwheel in the correct direction till the
awl comes to its undermost position. At this time, the “A” point on awl is under the up surface of
needle plate 1.6-3mm. To adjust the height of awl, the procedure as follows:
(1) Loosen the fastening screw of conical fastening pin (654-1037).
(2) Move the awl bar (654-1039-D) to its correct position.
(3) Tighten the fastening screw of the part 654-1037.
Tip of awl
Awl
A Point
Needle plate
1.6mm
Fig.2
4.2 Position setting of eccentric cam of hook needle movement (Fig.3)
Turn the handwheel in the correct direction till the hook needle bar (654-1063-D) comes to its
undermost position. Mark a scale that is even with the upper surface of needle bracket (654-1061)
on the hook needle bar. Then turn the handwheel continually till the awl comes to its undermost
position. At this time, the hook needle bar rise about 1.6-3.2mm from its undermost position. If the
movement of the hook needle is not accord with the rule described above, the crank angle of
eccentric cam(654-1014) of hook needle movement need to adjusted.
This setting is very important. It is the basic setting of all adjustment setting.
1.6-3.2mm
Upper surface Scale
Hook needle
bar
Upper surface Scale
Needle protector
bar
Fig.3
3
4.3 Position setting of hook need bar
Turn the handwheel in the correct direction by hand, let the hook needle approach the awl nearest.
At this time, the distance between hook needle and awl should be about 0.8mm. This distance can
be adjusted by move the hook needle bar after loosen the fastening screw of Conical fastening pin
(654-1037).
4.4 Position setting of the eccentric cam (654-1004) of needle transporting (Fig.4)
At first, turn the handwheel by hand to ensure that the machine is all right. Then run the
machine with high speed and observe the track of hook needle transporting. (Put a paper behind the
needle plate as background will convenient for observe.)
Right track
ABC
Too earlier Too later
Fig.4
The transporting track is as shown in Fig.4. The track A is right, the track B is too earlier and
the track C is too later. The needle transport can be adjusted by change the angle position of
eccentric cam(654-1004).
4.5 Position setting of the eccentric cam of needle protector movement (Fig.5)
Turn the handwheel by hand till the needle transporting is finished and the hook needle begin to
descend (“A ” point as shown in Fig.5). At this time, the barb of hook needle is higher than the tip
of needle protector about 3.2mm.
Barb
Needle plate
Raise
"A"
Descend Needle
Protector
Tip
protector
h=3.2mm
protector
Needle
frame
Transport
Fig.5
4
4.6 Adjustment setting of the space between presser foot and needle plate (Fig.6)
The space between presser foot and needle plate should be about half thickness of sewing
material. To adjust the space between presser foot and needle plate, proceed as follows:
(1) Lift the presser foot (654-1049-D) and put a wood block (Half thickness of sewing material)
under the presser foot.
(2) Put down the presser foot and let it press the wood block.
(3) Loosen the nut (654-1041) at the top of presser foot bar (654-1048) firstly, then loosen the
fastening pin (654-1047).
(4) Let the sliding block (654-1046) down to the bottom of slot.
(5) Tighten the nut and the fastening pin (654-1047) at last.
Sliding block
Slot
Nut
Fastening pin
Presser foot bar
Presser foot
Wood block
Fig.6
4.7 Assembly and adjustment of the thread winding rod
(1) Turn the handwheel by hand till the hook needle comes to its highest position and just begin
to move breadthwise.
(2) Loosen the fastening screw of thread winding rocker (654-1026), insert the thread winding
rod (654-1029-D) into the thread winding rocker.
(3) Loosen the fastening screws of cam(654-1031), turn the cam (654-1031) till the thread
winding rod close up the tip of the hook needle. Tighten the fastening screws at last.
(4) Thread the threads through the holes of thread winding rod and the slots of presser foot, strain
the threads towards the back of presser foot.
(5) Turn the handwheel in the clockwise direction, let the hook needles hook the threads and
move downwards. If the hook needles can not hook the threads, the operator can solve it by
bend the middle of thread wind rod.
4.8 Adjustment setting of the stitch length (Fig.7)
Turn the adjusting lever (654-1008) upwards to increase the stitch length, and turn it
downwards to decrease the stitch length.
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