Global SM 7774 Manual de instrucciones

SM 7774 Cp1 THREE NEEDLES SEWING MACHINE

OPERATING INSTRUCTION MANUAL

Rev 201101

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Thank you very much for your choice of this double thread side

seam sewing machine. Please read the manual carefully before use!

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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!

❤Allsettingandreplacementoperationmustbecarriedoutonlybythequalifiedexpert

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!

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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

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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

eed: Ste

less s

eed re

ulation

Stitchin

thickness: 0.8-6mm

Stitch len

th: 2-6mm

Needle s

acin

: 2.4mm/3.15mm

Motor: 560W/380V Three-

hase

Net wei

ht: 165K

Machine dimensions: 106×65×135c

（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.

Fig.1

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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

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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

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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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