Silvercrest KH 4300 User manual

KOMPERNASS GMBH · BURGSTRASSE 21 · D-44867 BOCHUM
www.kompernass.com
ID-Nr.: KH4300-03/09-V3
Overlock Sewing Machine
6
Overlock Sewing Machine
Operating instructions
KH 4300
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KH 4300
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CONTENT PAGE
Intended Usage 3
Safety instructions 3
Technical Data 4
Items supplied 4
Description of the appliance 5
Preparation 5
Adjusting the thread tree .................................................................................................................5
Bobbin supports................................................................................................................................5
Bobbin caps ......................................................................................................................................6
Connecting the foot pedal .............................................................................................................6
Controlling the sewing speed..........................................................................................................6
Safety switch .....................................................................................................................................6
Fitting the waste container...............................................................................................................6
Handwheel........................................................................................................................................6
Front flap ...........................................................................................................................................6
Opening the free arm ......................................................................................................................7
Threading yarns into the looper......................................................................................................7
Threading yarns into the needle .....................................................................................................8
Trial run..............................................................................................................................................9
Setting the thread tension 10
Adjusting thread tension on the needle threads ........................................................................11
Adjusting thread tension on the looper threads..........................................................................11
Overview of the machine adjustments.........................................................................................12
Changing threads (binding together) 13
Setting the stitch length 13
Setting the cutting width 14
Exchanging needles 14
Replacing bulbs 15
Exchanging the upper blade 15
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Close and broad sewing with three threads 16
Sewing freehanded 16
Adjusting the sewing foot 16
Hemstitch and edging 17
Sewing hemstitch 17
Sewing narrow edging 17
Differential feed motion 18
Manner of operation .....................................................................................................................18
Setting the differential feed motion ..............................................................................................18
Uneven material edges and smoothness.....................................................................................19
Avoid ruffles by stretching.............................................................................................................19
Troubleshooting 20
Cleaning and care 21
Storage 21
Disposal 21
Warranty and Service 22
Importer 22
Read the operating instructions carefully before using the appliance for the first time and preserve this
booklet for later reference. Pass the manual on to whomsoever might acquire the appliance at a later date.
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OVERLOCK SEWING
MACHINE KH 4300
Intended Usage
This overlock sewing machine is intended ...
– for use as a portable machine,
– for the trimming of material edges (sewing) of
typical household textiles, and ...
– only for domestic household use.
This overlock sewing machine is not intended ...
- to be installed at a permanent location,
– for the processing of other materials (e.g. leather,
canvas, sailcloth and other heavy materials),
- for commercial or industrial use.
Safety instructions
Like any other electrical device, a sewing machine
can cause serious, even life-threatening injuries.
To avoid these, and to work safely:
• Always disconnect the power supply when leaving
the machine unattended. This will prevent the
risk of accidents if the machine is switched on
accidentally.
• First pull the power plug before changing the bulb
or performing maintenance work on the machine.
This will prevent possibly life-threatening electric
shocks.
• Do not pull the plug out of the wall socket by the
lead. When pulling out the plug, always hold the
plug, not the lead.
• Only use the sewing machine in dry rooms.
• Arrange for defective power plugs and/or cables
to be replaced at once by qualified technicians
or our Customer Service Department.
• This appliance is not intended for use by indivi-
duals (including children) with restricted physical,
physio-logical or intellectual abilities or deficien-
ces in experience and/or knowledge unless they
are supervised by a person responsible for their
safety or receive from this person instruction in
how the appliance is to be used.
• Children should be supervised to ensure that
they do not play with the appliance.
• Never use the machine when the ventilation
apertures are blocked. Keep the ventilation
apertures of the machine and the foot switch
free from fluff, dust and waste material.
• Should the cable connected to the foot pedal
become damaged, to avoid potential risks it must
be replaced by the manufacturer, his customers
services or a similarly qualified person.
Warning about injuries and
material damages:
• Keep your work space tidy. An untidy workplace
can lead to accidents.
• Provide adequate lighting when working!
• Do not wear loose clothing or jewellery, as these
can be caught in moving parts. You should also
wear a hair net if you have long hair.
• Avoid adopting an unusual posture. Remain steady
and in a well-balanced position at all times.
• If accidents occur as a result of handling the ma-
chine with insufficient care, or failure to follow
the safety instructions in this manual, then the
manufacturer cannot accept liability.
• Never cover the ventilation slots! Risk of over-
heating!
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Technical Data
Number of threads 4 or 3
Number of needles 2 or 1
Sewing speed 1100 Revs/min
Stitch width 6 mm with 4 threads
6 mm or 4 mm with 3
threads
Stitch length 1 – 5 mm
Needles HA x 1 Nr. 11-14 or
130/705 Nr. 75-90
Power consumption : Motor: 90 W
Bulb: 15 W
Total: 105 W
Rated voltage: 230 V ~, 50Hz
Protection class: II
Bulb power: 15 W
Bulb voltage: 230 V / ~50 Hz
Bulb thread: E14 thread
The sound intensity level under normal operating
conditions amounts to 78dB(A).
Foot pedal
Use only the foot pedal originally supplied with this
sewing machine:
- ELECTRONIC FDM Speed Controller
- Type KD-2902
Items supplied
Overlock Sewing Machine
Oil
Waste container
Accessory box
Operating instructions
Replacement
(upper blade)
2 Needles Nr. 11
4 Needles Nr. 14
(2 in the machine,
pre-installed)
4 Bobbin caps
4 Spool pin
(preinstalled)
Allen key
Flat-headed screw-
driver
Covering hood
Pincers
Brush
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Description of the appliance
1Thread tree
2Thread tension selector (lower looper)
3Spool support
4Cold air intake
5Connection Footpedal/Power supply
6Handwheel
7Power switch (On/Off switch)
8Front flap
9Arm support
0Free arm
qThread tension selector (left needle)
wThread tension selector (right needle)
eThread tension selector (upper looper)
rThread guide
tThread guide plate
zAdjustment wheel for stitch length
uAdjustment wheel for differential feed motion
iAdjustment wheel for cutting width
oSewing foot
pLower blade
aUpper blade
sUpper looper
dLower looper
fRelease lever PUSH
gConnection plug
hFoot pedal
jPower plug
kWaste container
Preparation
Place the overlock sewing machine on a stable and
level surface. Ensure there is sufficient illumination at
your workplace.
Adjusting the thread tree
Completely withdraw the thread tree 1before
threading.
Turn the thread tree 1so that the thread guides
stand exactly above the spool supports 3.
Bobbin supports
Both industrial bobbins and household bobbins can
be used with this machine.
For industrial bobbins with a large diameter place
the bobbins supports in with the broad end to the
top, for bobbins with a small diameter place the
support in with the narrow end to the top.
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Bobbin caps
If using non-industrial thread bobbins, remove the
bobbin supports and place the bobbin caps on the
thread bobbins.
Connecting the foot pedal
Insert the plug of the footpedal ginto the connection
for the footpedal 5and the power plug jinto a
mains power socket.
To switch the machine on, press the power switch 7.
Attention!
During absences from the machine or when doing
maintenance work, always remove the plug jfrom
the mains power socket. Injury hazard!
Controlling the sewing speed
The sewing speed is controlled by means of the
footpedal h. The sewing speed is changed by ap-
plying more or less pressure to the footpedal h.
Safety switch
This machine is fitted with a micro safety switch. You
cannot start the machine if the front flap 8is open.
Close the front flap 8before you start to sew.
Fitting the waste container
The waste container kcollects remnants during
sewing, so that your workplace stays tidy. Place the
waste container kbetween the machine and the
table.
Handwheel
Note:
Always turn the handwheel 6towards yourself,
that is, in the same direction as with a domestic
sewing machine.
Front flap
To open the front flap 8, slide it as far as possible
to the right and, at the same time, draw it towards
yourself.
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Opening the free arm
For threading the yarns the free arm 0must be
opened.
1. Pull the arm support 9off to the side.
2. Open the front flap 8.
3. Press the release lever "PUSH" fand, at the
same time, pull the free arm 0 downwards.
Threading yarns into the looper
Attention!
Before starting to thread yarns, ALWAYS place the
power switch 7at OFF and remove the plug j.
This will prevent an unintentional starting of the ap-
pliance. If you do not, you run a risk of serious injury!
Correct threading is important, so that the stitches
are not irregular and that the yarn does not break.
On the inner side of the front flap 8there is a guide
to threading. Additionally, the thread guides are
marked in various colours.
In the accessory box you will find pincers, the use
of which helps make threading easier.
Threading takes place in this sequence:
1. First step: Upper looper s(green)
2. Second step: Lower looper d (blue)
3. Third step: Right needle (yellow)
4. Fourth step: Left needle (red)
For simplification, the individual steps are numbered
on the illustrations (1 q, 2 w, 3 e, 4 r, ...).
1. Open the front flap 8and free arm 0.
2. Turn the handwheel 6to yourself until the looper s
is in the most favourable position for threading.
3. Thread the upper and lower looper yarns as
shown.
Thread tree 1 (on the right)
Thread guide rand thread guide plate t
(on the right)
Note:
The yarn must lie correctly between the two discs of
the thread tension selector 2/e.
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Thread tension selector 2 e
4. Pull the end of the thread about 10 cm (4”) out
from the looper eyelet.
5. Lift the sewing foot oand slide the thread under
it; then lower the sewing foot oback down. The
lever for lifting and lowering the sewing foot o
is located at the rear of the machine, above the
sewing lever rod system.
Position the lever to lift the sewing foot o
Thread routing behind the front flap 8
Thread routing on from the thread guide plate 8
Threading yarns into the needle
For simplification, the individual steps are numbered
on the illustrations (1 q, 2 w, 3 e, 4 r, ...).
1. Turn the handwheel 6to yourself until the needles
stand fully at the top.
2. Thread the left and right yarns as shown.
Thread tree 1 (on the left)
Thread guide rand thread guide plate t
(on the left)
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Note:
The yarn must lie correctly between the two discs of
the thread tension selector.
Thread tension selector q w
Thread routing on from the thread guide plate 8
further thread routing
3. Guide the yarn, as shown, from front to back
through the eyes of the needles.
4. Pull the end of the thread about 10 cm (4“ )
out from the eyes of the needles. Lift the sewing
foot oand slide the thread under it; then lower
the sewing foot oback down. The lever for lifting
and lowering the sewing foot ois located at the
rear of the machine, above the sewing lever rod
system.
Position the lever to lift the sewing foot o
Trial run
When yarn has been threaded for the first time,
or after a yarn breakage it must be rethreaded,
proceed as follows:
Lift the sewing foot o.
Hold the ends of the threads between the fingertips
of your left hand, slowly turn the handwheel 6two
or three times towards yourself and then check the
threads once again.
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Lay the material for a trial run under the sewing
foot oand slowly start to sew.
The material will be automatically fed through.
When the task is complete, continue sewing until an
approximately 5cm (2") long length of threads has
formed at the end of the material.
Cut through the threads with scissors.
Setting the thread tension
The thread tension required is variable, being depen-
dant itself on the type and thickness of the thread
and fabric.
Check the seams and then adjust the appropriate
thread tension on the machine.
Tensioning the thread
When you turn the tensioning device to a lower
number, the tension reduces.
When you turn the tensioning device to a higher
number, the tension increases. The wheels of the
tensioning device have the following colours:
Correct thread tension:
Thread, right needle
Thread, left needle
lower looper thread
upper looper thread
Reverse
red
yellow
green
blue
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Adjusting thread tension on the needle
threads
The tread tension on the left needle
is too loose.
Adjust tension on the left thread.
The tread tension on the right needle
is too loose.
Adjust tension on the right thread.
Adjusting thread tension on the looper
threads
The lower looper thread is firm and/or the
upper looper thread is loose.
Loosen the tension of the lower
looper thread and/or tighten the
upper looper thread.
The upper looper thread is firm and/or the
lower looper thread is loose.
Loosen the tension of the upper
looper thread and/or tighten the
lower looper thread.
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Overview of the machine adjustments
The most appropriate thread tension adjustment for one type of material is not necessarily the ideal adjust-
ment for a different material.
The thread tensions required are dictated by the pliability and thickness of the material as well as the type
and thickness of the thread.
When necessary, adjust thread tensions as per this table:
Fabric Thread Needles Stitch length Thread tension
adjustment
Light:
• Georgette
• Muslin
• Batiste
• Dress fabric
• Crepe de Chine
• Silk
• Cotton
• Polyester
Nr. 80 - 100
HA x 1
Nr. 11
130 / 705H
Nr. 80
2.0 - 3.5 mm
• Standard
2.5 mm
Medium weight:
• Cotton
• Poplin
• Waterproofed
cotton
• Corduroy
• Cotton
• Polyester
Nr. 60 - 100
HA x 1
Nr. 11 - 14
130 / 705H
Nr. 80 - 90
2.0 - 3.5 mm
• Standard
2.5 mm
Heavy:
• Denim
• Tweed
• Velour
• Cotton
• Polyester
Nr. 50 - 80
HA x 1
Nr. 14
130 / 705H
Nr. 90
2.5 - 4.0 mm
• Standard
3 mm
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Changing threads
(binding together)
With the following procedure, changing threads is
quite simple:
1. Cut the yarn above the spindle and knot the
ends of the new and the old thread together.
2. Place the thread tension selector 2/q/w/e
at "0" and lift the sewing foot o.
3. Pull on the other end of the yarn until the knot
passes under the sewing foot o.
4. For threading it in the needle, pull on the other
end until the knot is in the eye of the needle and
then cut the yarn to the left and right of the knot.
Then carry out the rethreading.
Setting the stitch length
The stitch length can be adjusted in nine steps, from
1.0 to 5.0 mm. Almost all overlock work is
carried out with a stitch length of 2.5 – 3.5 mm.
Turn on the inner adjustment wheel for stitch length
zto adjust the stitch length:
Stitch Stitch length
Normal seams 2.0 - 5.0 mm
Standard: 3.0 mm
Narrow edgings 1.0 - 2.0 mm
Hemstitching 1.0 - 2.0 mm
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Setting the cutting width
The appropriate cutting width is, from material to
material, variable. Each time test the seams and
adjust the cutting width as follows:
1. Turn the handwheel 6towards yourself until the
needles are in the lowest position.
2. Open the front flap 8.
3. Press the lever PUSH f. The free arm 0lowers
itself and the adjustment wheel for the cutting
width ican be seen.
4. Turn the djustment wheel for the cutting width i.
With this you move the lower blade p. Continue
turning it until the looper threads are lying at the
edge of the material. When you turn in the direc-
tion W (wide), the cutting width is broader.
When you turn in the direction N (narrow), the
cutting width is narrower.
Examples:
Select a narrower cutting width if the material edges
ruffle during sewing. For this, turn the adjustment
wheel for cutting width ito the right (N).
Select a larger cutting width if the yarn is being sewed
beyond the material edge. For this, turn the adjust-
ment wheel for cutting width ito the left (W).
Exchanging needles
Attention!
Before exchanging the needles, remove the power
plug. This prevents an unintended starting of the ma-
chine. If you do not, you run a risk of serious injury!
1. Turn the handwheel 6towards yourself until the
needles are in the highest position.
2. Open the front flap 8and lower the sewing
foot o.
3. Loosen the setscrew against the needle with the
Allen key from the accessories box and then re-
move the needle:
- upper left setscrew for the left needle
- lower right setscrew for the right needle.
4. Insert the new needle, with the flat side to the
rear, into the needle mounting. Ensure that the
needle is inserted as far as is possible. Secure
the needle by retightening its setscrew.
When the needles have been correctly fitted, the
left needle stands a little higher than the right needle.
If the needles have not been correctly inserted, stitches
will occasionally be left out when sewing.
This machine is equipped with needles of the type
H.Ax1 (Needle system 130H) (for household ma-
chines).
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Replacing bulbs
Risk of electric shock
When changing bulbs, ALWAYS remove the plug j
from the mains power socket!
1. Remove the small round cover with a needle or
something similar.
2. Unscrew the screw completely.
3. Remove the lamp cover.
4. Exchange the bulb. Use a bulb of the type E14,
15 W.
5. Reassemble all of the parts in reverse order.
Exchanging the upper blade
Attention!
Before changing the blade a, ALWAYS remove the
plug jfrom the mains power socket. This prevents
an unintended starting of the machine. If you do
not, you run a risk of serious injury!
Note:
The lower blade pis manufactured from a special
material and normally does not need to be exchanged.
Should it at some time become nonetheless damaged,
please make contact with our Customer Services.
To exchange the upper blade awhen it has become
blunt:
1. Open the front flap 8and turn the handwheel 6
towards yourself until the needles are in the lowest
position.
2. Using the screwdriver, loosen the screw on the
upper blade holder and remove the upper
blade a.
3. Insert a new upper blade aand lightly tighten
the screw on the blade holder.
4. Adjust the upper blade ato that its cutting edge
surmounts the cutting edge of the lower blade p
by about 0.5-1.0 mm.
5. Now firmly tighten the setscrew in the holder for
the upper blade aand close the front flap 8.
upper blade a
lower blade p
Screwdriver
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Close and broad sewing with
three threads
When sewing with this machine you can adjust from
four to three threads.
Remove either the left or the right needle (see section
"Exchanging needles") and the appropriate thread.
The machine is now ready for sewing with three
threads.
With exclusive use of the right needle, the stitching
length amounts to 4 mm (0.16“).
With exclusive use of the left needle, the stitching
length amounts to 6 mm (0.24“).
Sewing freehanded
Freehand operation is excellently suited for the
sewing of trouser legs, sleeves and cuffs etc.
Remove the arm support 9, as shown in the illustra-
tion, to change from flatbed to free arm operation.
Adjusting the sewing foot
The special sewing foot ois adjusted to the posi-
tion N on the countersunk screw at the front of the
sewing foot ofor normal sewing operations.
Should you wish to sew a hemstitch, simply loosen
the large screw lightly and slide the small pin, which
protudes from the foot to the left, all the way in.
Now the letter R stands on the screw.
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Hemstitch and edging
For these two tasks proceed as follows:
1. In the section "Adjusting the sewing foot" reread
the instructions for adjusting the sewing foot o.
2. Turn the handwheel 6to yourself until the needles
stand fully at the top.
3. Open the front flap 8and remove the left needle
(see section " Exchanging needles").
4. Adjust the stitching length to 1.0 - 2.0 mm. Ensure
that the adjustment wheel for the differential
feed motion uis placed at “N”.
5. Adjust the stitching width as described in the sec-
tion “Setting the cutting width”.
6. If a yarn is not threaded, now rethread a new
yarn.
7. Lay your material under the sewing foot oand
start to sew.
Note:
Before you begin to sew on your actual workpiece,
always check the adjustments for stitching length
and thread tension on a material remnant.
Note:
Always remember to return the adjustment for the
sewing foot ofrom this special to normal operation
(sewing tasks) after the sewing of hems.
Pin
Sewing hemstitch
With the sewing of hemstitches the loops of the upper
looper thread should be pulled back to the underside
of the material. This is achieved by adjustment of the
thread tension, as described in the section "Setting
the thread tension".
Sewing narrow edging
If you wish to sew very thin or light materials, select
a suitable thread tension, as described in the sec-
tion "Setting the thread tension".
lower
looper thread
upper
looper thread
needle thread
lower
looper thread
upper
looper thread
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Important: If necessary, adjust the stitching length
and cutting width.
Hem stitching
Edging
Differential feed motion
With the differential feed motion uneven seams are
avoided in knitted materials, as well as the slippage
of textile positions. Additionally, the seams cause no
wrinkles in very light materials.
Manner of operation
The machine has two sets of toothed rack feeders,
one to the front and one to the rear. Both sets move
independant of each other. Through the differential
feed motion both toothed rack sets can move them-
selves at various speeds.
The toothed transport racks move themselves in an
elliptical motion and thus transport the material:
Setting the differential feed motion
The differential feed motion is adjusted to the de-
sired direction simply by turning the adjustment
wheel for the differential feed motion u.
"N" = "Neutral Position", the toothed rack feeders
move the material forward evenly.
"G" ="Gather Position", the front toothed rack feeders
push the material forward faster than the rear
ones. Thereby, elasticated material is not ex-
tended.
"S" ="Stretch Position", the rear toothed rack feeders
push the material forward faster than the front
ones. Thereby, the front toothed rack feeders
hold the material tautly.
The differential feed motion can also be adjusted
during sewing.
rear front
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