hobbylock
4752
Instruction Manual
Parts of the hobbylock 4752
Right needle thread tension
(green)
Telescoping thread guide
Setting screw for presser
foot pressure
Left needle thread tension
(blue)
Swivel plate
Upper looper
thread tension (red)
Thread guides
Thread spool pin
Cone thread
adapter
Thread spool stand
Setting knob for
stitch length
Foot control plug
with power
cord
Foot control plug
with power
cord
Electrical power
master switch
Lower looper
thread tension (yellow)
Looper cover
Handwheel
2
Simple, up-to-date sewing
Congratulations! You have bought a high-quality
product that provides unique advantages. Your new
hobbylock 4752 can take any material in its stride
and will sew through thick and thin for you.
Your PFAFF hobbylock features the very latest in design and technology, and it is just as simple to operate as this instruction manual is to follow.
Before you start sewing, please take the time to read
these instructions carefully. It is certainly time well
spent, and is the best way to find out just what your
machine can do and make full use of all its features.
If you have any further questions, just ask your authorized PFAFF dealer. Your dealer is happy to be of
service with any help or advice.
Let’s get started! We wish you many enjoyable hours
creating your very own fashions and projects!
3
Contents
Page
Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Accessories, optional . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Accessory box. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Changing a spool on a threaded machine . . . . . . . . . . . . . . . . 11
Cleaning the machine. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Cone thread adapter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Connecting the machine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Differential feed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Electrical power master switch . . . . . . . . . . . . . . . . . . . . . . . . . 7
Foot control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7, 8
Handwheel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Light bulb (sewing lamp), changing . . . . . . . . . . . . . . . . . . . . . 41
Looper cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Lubricating the machine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 - 41
Needle holder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Needle plate, removing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Needle position. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Needle, changing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Oiling the machine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Presser foot . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9, 21
Presser foot lifter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Presser foot pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Presser foot, changing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Program overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30, 31
Safety notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2, 7
Seam guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Seam width setting knob . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4
Seam width, setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Securing the seam . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27, 28
Sewing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Sewing light cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Sewing problems and their solutions. . . . . . . . . . . . . . . . . . . . 42, 43
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Stitch formation correction measures . . . . . . . . . . . . . . . . . . . 32 - 36
Stitch length setting knob . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Stitch length, setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Stitch width latch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Swivel plate. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Telescoping thread guide. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Thread chain cutter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Thread net . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Thread tensions, setting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Thread unreeling disc. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Threading aid for looper thread . . . . . . . . . . . . . . . . . . . . . . . . 13, 15
Threading aid for needle thread . . . . . . . . . . . . . . . . . . . . . . . . 16, 18
Threading paths/overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0
Threading the lower overedge looper (yellow) . . . . . . . . . . . . 14, 15
Threading the machine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Threading the needle(s) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16, 17, 18
Threading the upper overedge looper (red). . . . . . . . . . . . . . . 12, 13
Threading, important note. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Threads and needles chart. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Upper blade, changing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Upper blade, disengaging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Waste container . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
5
lug
groove
waste
container
looper cover
Attaching the waste container
Guide the lug into the groove on the looper
cover.
Accessories
screw driver tweezers
thread nets
thread unreeling discs
waste
container
accessory box
Storing the accessory box
Place the accessory box in the waste container.
6
needle
system
machine
oil
looper threading aid
replacement
upper
blade
wrench
cleaning
brush
needle threading
aid
lead cord/plug
connection socket
foot control plug
wall socket
main switch
main switch
foot control
Connecting the machine to the mains power supply
Switch the main switch to OFF.
Plug the foot control plug into the connection socket on the machine.
Plug the lead cord/plug into the wall socket.
Switch the main switch to ON.
Notes on safety
This appliance has a polarized plug (one blade wider than the other).
To reduce the risk of electric shock, it is designed to fit into a polarized outlet only one
way. If the plug does not fit correctly into the outlet, reverse the plug. If it still does not
fit, contact a qualified electrician to install the proper outlet.
Do not modify the plug in any way.
Foot controller type YC-482J (120 V)/YC-550 (230 V)/YC-551 (240 V) has to be used with
this overlock machine.
For the USA and Canada
This sewing machine has a polarized plug (one blade wider than the other). To reduce
the risk of electric shock, this plug is intended to fit in a polarized outlet only one way.
If the plug does not fit fully in the outlet, reverse the plug. If it still does not fit, contact
a qualified electrician to install the proper outlet. Do not modify the plug in any way.
7
foot control
handwheel
Sewing speed
The sewing speed is regulated by activating
the foot control. The further you press the
foot control down, the faster the machine
will sew.
swivel plate
Opening and closing the swivel plate
Opening: press the swivel plate towards the
left.
Closing: press the swivel plate towards the
right and slightly towards the machine.
Safety note: the swivel plate and the looper cover must always be closed when the
machine is used.
Direction of rotation of the handwheel
Always turn the handwheel towards you, as
shown in the illustration (i.e. counterclockwise).
looper cover
Opening and closing the looper cover
Opening: Push the looper cover fully to the
right and then swivel it down.
Closing: raise the looper cover and press
it towards the machine. The looper cover
snaps into place automatically.
8
telescoping
thread guide
thread
guides
stops
spool pin
Telescoping thread guide
Pull the telescoping thread guide upward to
its highest position.
The two upper telescopes must be rotated
slowly until their locking balls are heard to
lock into place.
cone thread
adapter
thread unreeling discs
slit
spool
pin
standard
presser foot
presser foot
lifter
Presser foot lifter
The presser foot can be raised and lowered
using the presser foot lifter.
The presser foot must always be lowered
when the machine is used.
spool
pin
Attaching the thread unreeling discs and the
thread nets
Pull the cone thread adapter off the spool
pin when using a small spool. Place the
spool on the spool pin in such a way that the
slit is at the top and place the thread unreeling disc on top of the spool.
thread net
If the thread jumps off the spool during
threading or sewing or if it slips out of the
thread tensioners when sewing rolled hems,
pull the enclosed net over the spool, as
shown in the illustration. In this way, you
can prevent the thread from jamming.
9
Threading the machine
left needle
thread
thread
guide
plate
right needle
thread
upper looper
thread
thread
guides
lower looper
thread
10
Before the machine leaves the factory,
threads are already threaded and their ends
are cut off. Tie one of these thread ends to
the thread from a spool with an overhand
knot, raise the presser foot and pull the new
threads through the loopers. In order to
thread the needle threads, pull the thread
ends through until the knots reach the
needle eye. Cut the threads on both sides
of the knots. Rethread the eye of the needle
with the needle threading aid (see Pages 16,
18). With this procedure, you can save a
great deal of time when threading.
If the threads are not threaded in the machine, thread the upper looper thread (red) first,
then the lower looper thread (yellow), the
left needle thread (blue) and finally the right
needle thread (green). Two threading diagrams are located behind the looper cover
to help you correctly thread the machine.
Threads that are threaded incorrectly will
lead to irregular (skipped) stitches, broken
needles and uneven thread tension. Therefore always make sure that all the threads
are perfectly threaded before beginning to
sew.
In order to replace spools, cut the threads
between the thread guides and the thread
guide plate. Thread the new threads in the
manner described opposite.
In order to make threading easier, set the
thread tension to “0”. After threading, reset
the thread tension to the desired number
(see Pages 30, 31).
11
Threading the upper looper (red)
Open the looper cover and the swivel plate.
Place the spool on the second spool pin
from the right. The guide points for the upper looper thread are marked in red. Two
threading diagrams are located behind the
looper cover to help you with the threading.
thread guides
Guide the thread from the rear through the
second thread guide from the right.
12
guide (3) for
the upper
looper
guide plate
thread
Guide the thread through the fourth and the
third hole from the right on the thread guide
plate, as shown in the illustration.
Guide the thread from the right to the left
into the left guide (3).
guide (5) for
the upper
looper thread
take-up lever
(7) of the
upper looper
thread
thread tensioner of
the upper looper
thread
guide (6) for
the upper
looper thread
Guide the thread through from the right between the tension discs and pull the thread
tight from both sides.
Feed the thread into the guide (5) for the upper looper thread.
Feed the thread into the guide (6) for the upper looper thread. Guide the thread into the
take-up lever (7) of the upper looper thread.
looper
threading
aid
upper
looper
guide (8) for
the upper
looper
Feed the thread into the guide (8) of the upper looper. Feed the looper threading aid
through the eye in the upper looper. Then
hook the thread end into the looper threading aid and pull the latter with the thread
through the eye. Remove the thread from
the looper threading aid and pull on the free
thread end until at least 10 cm (4”) is
showing beyond the eye. Lay the thread to
the left under the presser foot. Close the
swivel plate and the looper cover.
13
thread guide (1)
Threading the lower looper (yellow)
Open the looper cover and the swivel plate.
Place the spool on the second spool pin. The
guide points for the lower looper thread are
marked in yellow. Two threading diagrams
are located behind the looper cover to help
you with the threading.
Guide the thread from the rear through the
right thread guide (1).
14
guide (3) for
the lower
looper
thread
guide plate (2)
Guide the thread through both the right
holes on the thread guide plate (2), as shown
in the illustration.
Guide the thread from the left to the right
into the right guide (3).
guide (5) for
the lower
looper thread
thread tensioner of
the lower looper
thread
guide (9) for
the lower
looper thread
guide (8) for the lower
looper thread
guide (6) for the
lower looper thread
take-up lever (7) of the
lower looper thread
Guide the thread through from the right between the tension discs and pull the thread
tight from both sides.
Feed the thread into the guide (5) for the
lower looper thread.
guide (10)
for the lower
looper thread
thread
looper threading
aid
looper
threading
aid
Turn the handwheel towards you (counterclockwise), until the looper is on the extreme
right. Feed the looper threading aid through
the eye of the guide (10) for the lower
looper. Then hook the thread end into the
looper threading aid and pull the latter with
the thread through the eye of the guide (10).
Feed the thread into the guide (6) for the lower looper thread.
Guide the thread into the take-up lever (7) of
the lower looper thread.
Feed the thread into the guide (8) for the
lower looper thread.
Feed the thread into the guide (9) for the
lower looper thread.
looper threading
lower looper
aid
tweezers
Remove the thread from the looper threading aid and using the tweezers pull on the
free thread end until at least 10 cm (4”) is
showing beyond the eye of the lower looper.
Lay the thread to the left under the presser
foot. Close the swivel plate and the looper
cover.
15
Threading the left needle (blue)
Place the spool on the left spool pin. The
guide points for the left needle thread are
marked in blue. Two threading diagrams are
located behind the looper cover to help you
with the threading.
Guide the thread from the rear through the
left thread guide (1) and both the left holes
on the thread guide plate (2).
thread tension (3) of
the left
cover of the
take-up lever
(4)
needle
thread
Guide the thread from the right between
the tension discs and pull the thread tight
from both sides. Raise the needle(s) to the
high-est position by turning the handwheel
towards you. Guide the thread into the takeup lever (4). Feed the thread from the right
to the left into the left guide (5) for the
needle thread.
16
Führung
des Nadel-
fadens
Faden-
führung
der
Nadel-
stange
guide (5) for the
needle thread
thread guid
(6) on the
needle bar
Feed the thread from the left to the right
into the thread guide (6). Feed the needle
threading aid through the needle eye from
the rear. Then hook the thread end into the
needle threading aid and pull the needle
threading aid with the thread through the
needle eye. Pull on the free thread end until
at least 10 cm (4”) is showing beyond the
needle eye. Lay the thread to the left under
the presser foot.
Threading the right needle (green)
Place the spool on the second spool pin
from the left. The guide points for the right
needle thread are marked in green. Two
threading diagrams are located behind the
looper cover to help you with the threading.
Guide the thread from the rear through the
second thread guide (1) from the left. Guide
the thread through the fourth and the third
hole from the left on the thread guide plate
(2).
cover of the take-up
lever (5)
thread tension
(3) of the right
needle thread
Guide the thread from the right between the
tension discs and pull the thread tight from
both sides.
guide for the
right needle
thread (4)
Raise the needle(s) to the highest position
by turning the handwheel towards you.
Guide the thread through the guide (4) for
the right needle thread and through the
take-up lever (5)
17
guide (6 for the
needle thread
thread guide (7)
Feed the thread from the left to the right into
the right guide (6) for the needle thread.
Feed the thread from the left to the right into
the thread guide (7).
Feed the needle threading aid through the
needle eye from the rear. Then hook the thread end into the needle threading aid and
pull the needle threading aid with the thread
through the needle eye. Pull on the free
thread end until at least 10 cm (4”) is
showing beyond the needle eye. Lay the thread to the left under the presser foot.
Important note on threading
The needle(s) must always be threaded last
so that the needle threads do not run under
the looper thread as seen in drawing 1, but
instead over the looper thread as depicted
in drawing 2. Should this sequence not be
followed, thread breakage or skipped
stitches can occur.
18
If the looper threads break, you must pull
the needle threads out of the needle eye,
rethread the looper thread and then
rethread the needle threads.
(A)
the right seam
width
Setting the seam width
Set the seam width as follows:
1. Switch the main switch to OFF and pull out the lead cord/plug.
2. Open the looper cover and the swivel plate.
3. Move the upper blade to its lower position (see Page 24).
4. Adjust the setting knob until the lower blade is in the desired position.
(A) The seam width is too small - there are extra loops.
Turn the setting knob clockwise. The lower blade moves to the right.
(B) The seam width is too large - the edge is rolling up.
Turn the setting knob counterclockwise. The lower blade moves to the left.
5. Move the upper blade to its upper position.
6. Close the looper cover and the swivel plate.
(B)
Setting the seam width for rolled hems (Programs 05, 06)
Turn the setting knob counterclockwise to an extremely narrow setting.
19
setting
mark
setting
mark
stitch length
setting knob
setting knob
for differential feed
Setting the stitch length
Turn the stitch length setting knob in such a
way that the desired stitch length is indicated at the setting mark. The higher the number, the longer the stitch. The stitch length
can be adjusted between 1 and 5 mm.
The setting R is used for sewing rolled hems.
stretched
Setting the differential feed ratio
The differential feed ratio can be altered by
turning the setting knob. The number at the
setting mark shows the ratio between the
two feed dogs arranged behind each other.
The normal setting is 1.0.
The maximum differential feed ratio (2.0) is
only fully effective within the setting range
from 1 to 3.3 on the stitch length setting
knob. If the stitch length setting knob is set
to a value between 3.3 and 5.0, the differential feed ratio is automatically adjusted to a
value between 2.0 and 1.3.
20
contracted
Setting:
– Turn the setting knob counterclockwise
(towards 2.0) to achieve gathering effects
on lightweight fabric or to smooth fabric
that is being overly stretched out of
shape.
– Turn the setting knob clockwise (towards
0.7) to achieve a ruffled (lettuce) effect on
knit or bias-cut fabrics or to smooth fabric
that is being contracted while sewing.
Standard setting
Top side of
the machine
adjusting screw
presser
foot lifter
2 mm
to reduce
needle
to increase
Presser foot pressure
The presser foot pressure does not need to
be adjusted for most fabrics. If you are
working with light or heavy fabrics then
you may need to adjust the pressure. In this
case set the adjusting screw as follow:
– for heavyweight fabrics increase pres-
sure by turning the adjusting screw to
the right
– for lightweight fabrics reduce pressure
by turning the adjusting screw to the left
Adjust the adjusting screw for normal
sewing work in such a way that its upper
edge protrudes 2 mm out from the top side
of the machine (see illustration).
lever
presser foot
holder
Removing the presser foot
Turn the machine off.
Raise the needle(s) to the highest position.
Raise the presser foot and press the lever
at the rear of the presser foot holder. The
presser foot will be released automatically
from the holder.
lever
clamp
pin
Attaching the presser foot
Place the presser foot beneath the presser
foot holder, until the pin of the foot is directly under the presser foot holder clamp.
Lower the presser foot holder and press
lever until the foot then clicks into place. Lift
the presser foot lever to check that the pressser foot is properly locked into place.
21
fastening screw
for the left needle
fastening
screw for
the right
needle
Changing the needle
Switch the main switch to OFF.
Move the needle(s) to the highest position.
Loosen the fastening screw of the needle
that is to be changed.
Needle system HA X 1SP (130/705 H-PS) is
required for this machine.
edge of the
needle bar
needle
fastening
screw
the flat
side
points
towards
the rear
edge of the
needle bar
stop
pin
needle
holder
Do not use bent or blunt needles.
Inserting the right needle
Insert the new needle in such a way that
the flat side points towards the rear. Push
the needle upward until it touches the stop
pin. Tighten the fastening screw of the right
needle.
Inserting the left needle
Insert the new needle into the needle holder in such a way that the flat side points
towards the rear. Push the needle upward
until it touches the edge of the needle bar.
Tighten the fastening screw of the left
needle.
– If the needles are inserted correctly,
the position of the left needle should
be slightly higher than that of the right
needle.
22
Use of the right needle only
(for 3-thread seams with a narrow seam
width)
Turn the machine off.
Remove the left needle and the left needle
thread. Tighten the left needle fastening
screw again slightly so it does not fall out.
Use of the left needle only
(for 3-thread seams with a wide seam
width)
Turn the machine off.
Remove the right needle and the right
needle thread. Tighten the right needle
fastening screw again slightly so it does
not fall out.
Changing the needle when sewing with three threads
Undo both needle fastening screws and remove the old needle. Insert the new needle
as far as it will go and tighten the relevant
fastening screw. Also tighten the other
fastening screw slightly so it does not fall
out.
23
ridged knob for lowering the upper blade
upper blade
blocking
pin
Disengaging the upper blade
Turn the machine off.
– Open the looper cover and the swivel
plate.
– Push the ridged knob for lowering the
upper blade to the right and turn it
towards you. Guide the upper blade over
the blocking pin so that the upper blade
engages in its lower position.
– Close the looper cover and the swivel
plate.
Engaging the upper blade
Turn the machine off.
24
ridged knob for lowering
the upper blade
blocking
pin
– Open the looper cover and the swivel
plate.
– Push the ridged knob for lowering the
upper blade to the right and turn it away
from you. Guide the upper blade over
the blocking pin so that the upper blade
engages in its upper position again.
– Close the looper cover and the swivel
plate.
setting
knob
setting
marks
stitch width
latch
Setting the stitch width latch
(for standard overlock seams or rolled
hems)
Switch the main switch to OFF.
– Open the looper cover and the swivel
plate.
– Disengage the upper blade (see Page 24).
– Press the stitch width setting knob
towards the right and push the bed slide
of the stitch width latch to the setting
mark S (standard) or R (rolled hem). Then
release the setting knob again slowly.
– Move the upper blade to its upper posi-
tion.
– Close the looper cover and the swivel
plate.
standard
seams
stitch
width
latch
bed slide
Set the bed slide for the stitch width latch to
position S. The stitch width latch will be
pushed forward. This setting allows you to
sew all types of standard overlock seams.
rolled
hems
stitch
width
latch
bed slide
Set the bed slide for the stitch width latch to
position R. The stitch width latch will be
pushed backward. This setting allows you to
sew all types of rolled hems.
25
Starting sewing
Lay the sewing material under the front of
the presser foot (it is not necessary to raise
the presser foot). Turn the handwheel carefully a few revolutions towards you and
check the thread chain. Start sewing slowly.
The sewing material is fed automatically.
Guide the sewing material in the desired
direction.
Using the seam guidelines
On the top side of the looper cover, you will
find seam guidelines which indicate the
distance from the needles. These guidelines
should help you to properly position your
fabric when sewing.
Finishing sewing
When you have completed your seam, allow
the machine to continue to sew slowly until
the thread chain has attained a length of approx. 12 cm (4 3/4”). At the same time, pull
the thread chain gently towards the rear.
26
Cut the threads off using the thread cutter,
as shown in the illustration. Leave a thread
chain approx. 5 cm (2”) long beyond the end
of the fabric.
A B
Securing the seam ends
Leave a thread chain of approx. 5 cm (2”) in
length extending at the beginning and the
end of the seam to prevent the seam from
coming undone. Secure the thread chain at
the beginning and end of the seam using
one of the following methods.
Separate the individual thread ends and knot
them together.
C C
Stitching the beginning of the seam
1. Before inserting fabric under the presser
foot, serge a thread chain of approx. 5 cm
(2”) in length.
2. Insert the sewing fabric into the machine
and sew 2-3 stitches into the fabric.
3. Raise the presser foot, guide the thread
chain to the left around the presser foot
towards the front and lay the thread chain
under the presser foot.
Thread the thread chain into a needle with a
large eye and pull the thread chain into the
overlock stitches of the sewing fabric.
4. Pull the thread chain slightly taught
towards the upper blade. Lay the thread
chain under the upper blade. Hold the
thread chain firmly in this position, lower
the presser foot and begin to sew.
5. The upper blade will cut off the excess thread chain, leaving an overstitched seam
of approx. 2.5 cm (1”).
27
Stitching the end of the seam
1. Sew 2-3 stitches off the end of your fabric.
2. Turn the needles to their highest position
and raise the presser foot.
3. Flip the fabric over so the bottom side is
now on the top. Pull the fabric around so
it is positioned under the presser foot and
in front of the needles. Make sure the
fabric is not positioned in the path of the
upper blade.
28
5. Lower the presser foot, sew approx. 2.5
cm (1”) over the seam and pull the fabric
away to the side at an angle, sewing off
the fabric.
Threads and needles chart
Light Medium-heavy heavy Knitwear
fabrics fabrics fabrics
organdy, cotton, tweed, knitwear
georgette, linen, satin, upholstery
Fabric
batiste, standard fabric, denim,
crepe-de-Chine, fabrics heavy cloth
lining fabrics
Thread
Needle
Thread tension
cotton: cotton: cotton: cotton:
no. 80 - 100 no. 50 - 100 no. 50 - 60 no. 50 - 60
silk: silk: silk: synthetic thread:
no. 80 - 100 no. 50 - 100 no. 50 - 60 no. 50 - 60
synthetic thread: synthetic thread: synthetic thread:
No. 80 - 100 No. 50 - 100 No. 50 - 60
cotton nylon +
polyester thread
(looper thread)
130/705 H-PS 130/705 H-PS 130/705 H-PS 130/705 H-PS
70/80 80/90 80/90 90
Setting thread tension
setting
mark
The following pages contain directions for
setting thread tensions for all programs.
Adjust the tension by turning the tensioning
wheel until the dot marker is at the desired
setting.
The settings for adjusting thread tension are
recommendations. Fabric type, thread quality and needle gauge will influence seam
results. Always sew off a test seam onto a
piece of scrap fabric and check the thread
loops. Adjust the thread tension if necessary.
to increaseto reduce
Tip: as practice, use threads that match the
tension dials, e.g. thread the upper looper
with red thread, the lower looper with yellow thread, etc.
Note: in the program overview on Pages 30
and 31, you will find the appropriate settings
for each individual program.
29
Program overview
Program Application Needle
Program 01
Program 02
Program 03
Program 04
3-thread
overedge,
narrow
3-thread
overedge,
wide
3-thread
flatlock,
narrow
3-thread
flatlock,
wide
Serging light (easily frayed)
fabrics.
Serging tightly woven
(easily frayed) fabrics.
Serging medium-heavy
fabrics. As a flatlock seam,
for joining stretch fabrics and
decorative finished edges.
Serging medium-heavy
fabrics. As a flatlock seam,
for joining stretch fabrics and
decorative finished edges.
position
L = left
R = right
R
L
R
L
Program 05
Program 06
Program 07
30
3-thread
rolled hem
Folded
3-thread
rolled hem
4-thread
overedge
Serging light to mediumheavy fabrics. Decorative
edges.
Serging light to mediumheavy fabrics. Decorative
edges.
Joining and simultaneous
serging of all fabrics, in particular stretchy fabrics.
R
R
LR
Thread tension: The values refer to medium-heavy
fabrics and normal polyester thread
blue green red yellow
Stitch
length
Position of
stitch width
latch
3 3 3 3 S
3 3 3 3 S
0 2 3 3 S
0 2 3 3 S
4 3 3 R R
4 3 8 – 9 R R
3 3 3 3 3 S
31
Seam pattern
Top side
Underside
Stitch formation correction measures
4-thread overedge seam (program 07)
blue green red yellow
3 3 3 3
When all tensions are correctly set, the loops
of both looper threads are directly on the
edge of the fabric.
Top side
Top side
Underside
The left needle thread (blue) is too loose.
Set the blue thread tension to a higher
value.
Top side
Underside
The upper looper thread (red) appears on
the underside of the fabric.
Set the red thread tension to a higher value
and/or the yellow thread tension to a lower
value.
32
Underside
The lower looper thread (yellow) appears on
the top side of the fabric.
Set the yellow thread tension to a higher
value and/or the red thread tension to a
lower value.
Seam pattern
Top side Top side
Underside
3-thread overedge seam (progr. 01, 02)
blue green red yellow
wide
3 3 3
narrow
blue green red yellow
3 3 3
Top side
Underside
Underside
The needle thread is too loose.
Set the relevant needle thread tension to a
higher value.
Top side
Underside
The upper looper thread (red) appears on
the underside of the fabric.
Set the red thread tension to a higher value
and/or the yellow thread tension to a lower
value.
The lower looper thread (yellow) appears on
the top side of the fabric.
Set the yellow thread tension to a higher
value and/or the red thread tension to a
lower value.
33
Seam pattern
Top side
Underside
3-thread flatlock seam (progr. 03, 04)
blue green red yellow
wide
0 2 3
narrow
blue green red yellow
0 2 3
Top side
Top side
Underside
The needle thread is too tight.
Set the relevant needle thread tension to a
lower value.
Top side
Underside
The upper looper thread (red) appears on
the underside of the fabric.
Set the red thread tension to a higher value.
34
Underside
The lower looper thread (yellow) is too
loose.
Set the yellow thread tension to a higher
value.
Seam pattern
Top side
Underside
3-thread rolled hem (progr. 05)
blue green red yellow
4 3 3
Top side
Top side
Underside
The right needle thread (green) is too loose.
Set the green thread tension to a higher
value.
Top side
Underside
The upper looper thread (red) appears on
the underside of the fabric.
Set the red thread tension to a higher value
and/or the yellow thread tension to a lower
value.
Underside
The lower looper thread (yellow) appears on
the top side of the fabric.
Set the yellow thread tension to a higher
value and/or the red thread tension to a lower value.
35
Seam pattern
Top side Top side
Underside
Folded 3-thread rolled hem (progr. 06)
blue green red yellow
4 3 8 – 9
Top side
Underside
Underside
The right needle thread (green) is too loose.
Set the green thread tension to a higher
value.
Top side
Underside
The upper looper thread (red) only partly
loops around the fabric edge.
Set the red thread tension to a lower value
and/or the yellow thread tension to a higher
value.
36
The lower looper thread (yellow) appears on
the top side of the fabric.
Set the yellow thread tension to a higher
value and/or the red one to a lower value.
Optional accessories Order No.
98-200 277-10/900
98-200 278-10
98-200 278-10
98-200 279-10/100
98-200 280-10/500
98-200 281-10/600
98-200 282-10/700
1 Blindstitch foot
For serging blind hems on mediumheavy and thick fabrics.
2/3 Taping attachment with tape guide
Use to protect knit and other stretchy
fabric from stretching out of shape
when you sew a shoulder.
4 Cording foot type A
For sewing on cords, elastic thread and
fishing line on the top side of the fabric
and for decorative cording.
5 Cording foot type B
For sewing on cords and yarn on the
top or on the underside of the fabric
and for decorative cording.
6 Piping foot
For sewing together two pieces of fabric with a piping tape between them,
in one operation.
7 Beading attachment with beading
guide
For serging on beading and sequins.
98-200 283-10/800
98-200 284-10/900
98-200 285-10
98-200 286-10/100
8 Shirring/Gathering attachment
For shirring/gathering and joining two
pieces of fabric simultaneously.
9 Elastic tape attachment
For sewing on elastic.
10 Edge guide
For guiding the fabric edge and
measuring cut widths and seam widths
simultaneously.
11 Needle threader
For easy threading of the needle.
37
Machine maintenance
Cleaning the machine
Switch the main switch to OFF.
Open the looper cover and swivel plate. Use
the cleaning brush provided to remove any
waste thread.
In order to clean the upper blade and the
feed dog, you may also use a vacuum
cleaner.
fastening screw
of the needle
plate
Cleaning the feed dog
Switch the main switch to OFF.
Open the looper cover and the swivel plate.
Remove the needles and the presser foot.
Loosen the fastening screw of the needle
plate and remove the needle plate.
38
Remove any waste thread from the feed dog
towards the front using the cleaning brush.
Fasten the needle plate, attach the presser
foot, insert the needles and close the looper
cover and the swivel plate.
Lubricating the machine
Switch the main switch to OFF.
Open the swivel plate. Apply a few drops
of high-quality machine oil to the points
marked with arrows.
Oil the machine once a week for normal
operation or every ten hours for continuous
operation.
Open the looper cover and oil the marked
points.
Oil the marked point on the top of the
machine.
39
blocking pin
0,5 - 1 mm (1/32”)
lower blade
upper blade
lower
blade
hexagonhead screw
upper blade
Changing the upper blade
Switch the main switch to OFF.
Open the looper cover and the swivel plate.
Move the upper blade to its lower position
(see Page 24).
Undo the hexagon-head screw of the upper
blade and remove the upper blade.
Insert the new upper blade into the blade
holder in such a way that the blocking pin
engages in the groove. Tighten the hexagonhead screw slightly.
Move the upper blade to its upper position.
Turn the handwheel towards you until the
upper blade has reached its lowest position.
Undo the hexagon-head screw and adjust
the position of the upper blade so that the
edges of the upper blade and of the lower
blade overlap by about 0.5 to 1 mm (1/32”)
(see illustration). Tighten the hexagon-head
screw.
– Close the looper cover and the swivel
plate.
40
hexagon-
head screw
blocking pin
fastening
screw
sewing light
cover
Changing the light bulb
Switch the main switch to OFF.
Loosen the fastening screw to the sewing
light cover until the cover can be removed.
Removing the light bulb
Bayonet holder: press the lamp in and turn
to the left.
to remove
to
insert
light
bulb
Inserting the light bulb
Bayonet holder: press the lamp in and turn
to the right.
Replace the sewing lamp cover and tighten
the fastening screw.
Safety notes
Only use bulbs with a maximum output of
15 Watt.
The bulb becomes very hot. Never touch the
bulb with bare hands.
Transporting the machine
Position your fingers in the cutout on the
rear side of the machine, as shown in the illustration.
41
Sewing problems and their solutions
This machine has been developed with ease of operation in mind. No difficult or tricky settings need to be made. Sewing problems of the kind described below may occur as a result
of minor adjustment and operating errors. They can be easily adjusted by following the
instructions.
Problem Cause Solution
Needle breakage The needle was bent or the Insert new needle
point damaged. (see Page 22).
The needle was not fully inserted. Insert needle fully
(see Page 22).
The fabric was pulled too firmly. Do not pull on the fabric
when sewing.
Thread breaks Incorrectly threaded. Thread properly
(see Page 10 - 18).
Thread has caught. Check if the thread is caught
on the spool stand etc.
Thread tension is too tight. Correct the tension
(see Page 32 - 36).
Needle not fully inserted. Insert needle correctly
(see Page 22).
Incorrect needle used. Use needle system HAx1SP
(130/705 PS).
Skipping stitches Needle bent or point damaged. Insert new needle
(see Page 22).
Needle not fully inserted. Insert needle correctly
(see Page 22).
Incorrect needle used. Use needle system
HAx1SP (130/705 H-PS).
Incorrectly threaded. Thread correctly
(see Page 10 - 18).
Stitch Incorrect setting of thread tensions Re-set thread tensions
formation faulty (see Page 32 - 36).
42
Problem Cause Solution
Fabric not neatly Waste thread between upper Upper blade is blunt.
trimmed and lower blade.
Clean blades. Replace upper blade
(see Page 40).
Puckered seams Thread tension too tight. Reduce thread tension.
Incorrect setting of differential feed. Re-adjust differential feed
(see Page 20)
Thread has caught due to incorrect Thread correctly
threading. (see Pages 10 - 18).
Fabric not fed Stitches too short. Increase stitch length
through evenly (see Page 20).
Sewing foot pressure too low for Increase sewing foot pressure
heavy fabrics. (see Page 21).
Sewing foot pressure too high for Reduce sewing foot pressure
lightweight fabrics. (see Page 21).
Waste thread in the feed dog. Clean the feed dog.
Machine will The lead cord/plug is not seated (see Page 7).
not operate properly in the socket.
The main switch is not switched on. (see Page 7).
43
Specifications
Maximum sewing speed 1200 stitches/min.
Seam width 3.0 mm - 6.7 mm
Stitch length 1.0 mm - 5.0 mm
Presser foot exchangeable
Lubrication manual
Presser foot height 4.5 mm
Overedge stroke 2.0 mm
Needle system HAx1SP (130/705 H-PS)
Needle size 80/12, 90/14
Number of threads 3, 4
Dimensions (width x height x depth) 310 x 280 x 270 mm
Weight 7.1 kg
Packing contents
1 machine
1 foot control
1 instruction manual/guarantee card
1 machine cover
1 accessory box
1 waste container
44
Notes
45
Notes
46
Notes
47
Parts of the hobbylock 4752
Movable upper blade
Fixed lower
blade
Thread chain cutter
Upper overedge
looper (red)
Lower overedge
looper (yellow)
Standard presser foot
Bed slide for stitch
width latch
Presser foot lifter
Needle plate
Ridged knob for lowering
the upper blade
Setting knob for
seam width
VSM Group AB • SE-561 84 Huskvarna • SWEDEN
www.pfaff.com
412 86 03-26D • English • Inhouse • © 2004-2008 VSM Group AB • Printed in Sweden on environmental-friendly paper
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