typical GC6-6 User manual

GC6-6 // GC6-7
COMPOUND FEED LOCKSTITCH SEWING MACHINE
3-FACH-TRANSPORT DOPPELSTEPPSTICH-NÄHMASCHINE
INSTRUCTION BOOK // PARTS CATALOGUE

CONTENTS
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1
2
2
2
3
3
4
5
5~6
7
8
8
8
8
9
9
9
10
10
10
11
11
12
12
1. Brief introduction
2. Main specifications
3. Installation and preparation
3.1 Installation
2 Preparation
4.1 Selection of the thread
4.2 Coordination between needle, thread and sewing material
4.3 Installing the needle
4.4 Winding the bobbin thread
4.5 Threading the needle thread and drawing the bobbin thread
4.6 Setting the bobbin
4.7 Installing the bobbin case
4.8 Setting stitch length and reverse sewing
1 Adjusting the thread take-up spring
5.2 Adjusting the thread guide
5.3 Adjusting the tension of needle thread and bobbin thread
3.1.1 Location of the machine
3.1.2 Installing drip pan
3.1.3 Mounting machine head
3.1.4 Mounting rock shaft bracket of knee lifter
3.1.5 Installing the motor
3.1.6 Connecting the clutch lever to the pedal
3.1.7 Installing the bobbin winder
3.1.8 Installi g the thread unwinder
3.
3.2.1 Cleaning the machine
3.2.2 Examination
3.2.3 Lubrication
3.2.4 Trial run
4.4.1 Winding method
4.4.2 Winding adjustment
5.
5.1.1 Adjusting the thread take-up spring tension
5.1.2 Adjusting the swing range of thread take-up spring
n
4. Operation
5.Adjusting thread tension
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2
2
2
3
4
8
8
4
11

21~22
23~24
25~26
27~28
29~30
31~32
33~34
35~36
37~38
39~40
41~42
43~44
45~46
47~48
49~50
1. Model GC6-6 arm and bed
2. Model GC6-7 arm and bed
3. Model GC6-6 needle bar and thread take-up
4. Model GC6-7 needle bar and thread take-up
5. Arm shaft and vertical shaft
6. Rotating hook and its shaft
7. Stitch length regulating
8. Bottom feed
9. Model GC6-6 presser bar
10. Model GC6-7 presser bar
11. Model GC6-6 top feed
12. Model GC6-7 top feed
13.Lubrication
14.Drip pan and knee lift
15. Accessories
Parts Manual
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6. Adjustment
7. Periodical cleaning
6.1 Timing between needle and rotating hook motion
6.2 Adjusting the feed dog
6.3 Adjusting the tension releasing mechaninsm
6.4 Adjusting the pressure of presser foot
6.5 Adjusting top feed mechanism
6.1.1 Adjusting the needle bar position
6.1.2 Adjusting rotating hook point timing with needle
6.1.3 Removing and installing the rotating hook
6.1.4 Adjusting the clearance between rotating hook and bobbin case
holder position bracket
6.2.1 Adjusting height of feed dog
6.2.2 Adjusting the position of feed dog
6.5.1 Adjusting top feed mechanism of machine Model GC6-6
6.5.2 Adjusting the feed mechanism of machine Model GC6-7
8. Troube-shooting
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13
14
14
15
15
14
15
15
16
16
16~17
17~18
19
20
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14
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1. Brief introduction
Model GC6-6 and GC6-7 medium and heavy
duty lockstitch sewing machine both are constructed
with the mechanisms of single needle, link thread
take-up with needle bearing, precise spiral bevel gear
transmition, big rotating hook with double thread
capacityand forward or reverse sewing. They have
the same advantages of small momentof torsion,
low noise, feeding smoothly even from sewing
single layer to the lap seams with equability of
stitch length, beautiful flat stitches in appearance.
They are widely used in the factories of suitcase,
bag, leather goods, sofa, tarpaulin, cushion,cloth,
shoes,cap and labour protection goods. .
GC6-6 GC6-7
2000spm
2. Main specifications
Max. sewing speed
Max.stitch length
Presser foot lift
Max.thickness of
material to be sewn
Needle
Rotating hook
Motor
9mm
6.5mm(13mm when knee controlled)
370w(used for sewing machine only)
8 layers of leather clothes,at free conditions the thicknessof material up to 8mm
model DP 17,#18-#22 used for machine Model 6-6GC
big rotating hook with double thread capacity
Model
model DP 17,#18-#24 used for machine Model 6-7GC
The main differences between machines of Model
GC6-6 and Model GC6-7 are as follows:
The feed mechanism of model GC6-6 is constructed
by the top feed of walking presser foot and bottom feed
of feed dog.
It can be adjusted to achieve the synchronization
of top and bottom feed , to eliminate the slippage
between top and bottom layers when sewing loose
bulge and slippery materials, also, the top feed can
be adjusted in differential with the bottom feed for
sewing pleat.
Whereas on machine Model GC6-7, the synchr-
onized top feed of walking presser foot, needle feed
and bottom feed of feed dog forming the unison feed,
which the slippage between material layers could be
eliminated absolutely.So that the elastic and slippery
materials can be sewn successfully. Most of this
machine is the top feed presser foot nearing needle,
therefore the cording, lap seaming and folding all
are convenient.
1

2
1
2
1
119.5
15
30

A
B
3
3. Installation and preparation
3.1 Installation
3.1.1 Location of the machine
To ensure a smooth running, the machine
of rubber mat between machine stand and floor is
recommended for further reducing the running
noise and vibration.
Should be located on rigid and flat floor.The insert
3.1.2 Installing drip pan(Fig.1)
Fix drip pan 1into the table cutout, aligning
rod 15 of machine head, and to touch it, also
maintain dimendions 30 and 119.5mm from nail
hole to the table, then drive nails into both
sides of the cutout to secure the drip pan.(further
see figure on page56).
3.1.3 Mounting machine head(Fig.2)
Make the hinge A of machine head engaged
with hinge socket B on the table, then turn the
machine head freely till it is seated on the frame
of table cutout.
knee lifter lifting rod 3 with knee lifter connecting
3
268
132.5
119.5
15
3
11
29
6
7
18
3.1.4 Mounting rock shaft bracket of knee liter
(Fig.3, also see figure on page 56)
1) Adjust rock shaft knee plate 18 according to
the body of operator,for the convenience to operate.
2) Adjust the position of knee lifter assembly
according to Fig. 3, then fasten the rock shaft
bracket with wood screws 6.