For general warnings on the subject of safety, see the INSTRUCTION BOOKLET. The installation
and adjustment as well as maintenance operations shown
by specialist technical staff.
WARNING
BEFORE CARRYING OUT MAINTENANCE OPERATIONS, DISCONNECT THE EQUIPMENT AND
MOTOR FROM THE MAIN ELECTRIC AND PNEUMATIC CIRCUITS, AND MAKE
DOES NOT START
BEFORE RECONNECTING TO THE MAIN ELECTRIC AND PNEUMATIC CIRCUITS, MAKE SURE
ALL COVERS HAVE BEEN CLOSED AGAIN AND ALL PROTECTION WHICH MAY UAVE BEEN
REMOVED HAS BEEN REPLACED.
NONCOMPLIANCE WITH THESE SAFETY RULES MAY PUT PEOPLE AT RISK.
WHEN THE PEDAL IS PUSHED.
in
this booklet must only be carried out
SURETUE
MACHINE
CONDITIONS OF
Rirnoldi Necchi guarantees that all Rimoldi Necchi machines (hereafter defined as "the
products") will
from the date the invoice is issued to the end user (client).
During the guarantee period,
(hereafter defined as the
guarantee and sold by them on behalf of Rimoldi Necchi free of charge. The repaired or replaced parts
are only guaranteed for the remaining period of the product guarantee. Any maintenance operations
and repairs carried out during the guarantee period do not modify the expiry date of the guarantee itself.
The guarantee operations are carried out on the
In
this case, the client must assume all transport costs and risks. Any replaced parts removed from the
product become property of Rimoldi Necchi.
Final decisions regarding the validity of the guarantee service requests and/or technical mett1ods
involved are taken by the Rimoldi Necchi Quality Management.
This guarantee does not cover breakdowns due to normal wear, unauthorized operations or
modification, improper or inexpert use of the product, lack of, incorrect or insufficient maintenance
and/or lubrication, inadequate supply systems (electric and pneumatic), use of non-original spare parts
and/or accessories and, finally, it does not cover damage to electronic parts caused by natural
atmospheric events. Therefore, components which are worn due to normal use of the machine are not
replaced under guarantee, such as needles, feed dogs, plates, presser foots, knives, loopers, etc
GUARANTEE
be free from defects
"Seller"), will repair or replace any defective parts of the products covered by this
in
material or workmanship for one shift per day for twelve months
RIM, the AGENT or the RETAILER of the Rimoldi Necchi machine
client's premises, or, if necessary, at the sellers.
This guarantee only ensures the client for the repair and replacement of defective parts.
claims and requests are excluded, including those related to loss of production or damage to things or
people due to the use of a Rimoldi Necchi machine, even if due to the breakdown of the machine itself.
Requests to replace the product itself are also excluded. This guarantee replaces any other guarantee
or condition, either
particular purposes.
This is the unique and complete agreement which regulates the relationship between
the seller, and Rimoldi Necchi, relating to the guarantee. No employee or organization of the
is authorized to modify it
In
the case of dispute regarding the contents, limits of application and anything else concerning
the guarantee, the
are only provided out of courtesy.
Rimoldi Necchi S.r.l. reserves the right
information printed in this brochure.
explicit or implicit, including therein any guarantee that the product is suitable for
on
behalf of the seller or Rimoldi Necchi.
Italian version of these regulations will apply, since translations into other languages
The competent law court is Milan,
to
modify
or
val}', for technical
Italy.
or
commercial reasons, the
All other
ttle client,
seller
Page 4
INDEX
1 TECHNICAL FEATURES
2 TYPE OF STITCHES
3 MACHINE SPEED AND MOTOR PULLEY TABLE
4 GENERAL
5 INSTALLATION
5.1
5.2 - LAMP CONNECTION
5.3 -CONNECTION DIAGRAMS
6 LUBRICATION
6.1
6.2 - DISPOSAL OF USED OIL
6.3 - OIL CHANGE
7
8 TRANSPORT
9 REPLACING THE NEEDLE
10 PRESSER FOOT PRESSURE
11
12
13
14
15
16
17 NEEDLE GUARD ADJUSTMENTS FOR OVEREDGE STITCH
18 NEEDLE GUARD ADJUSTMENTS FOR THE CHAIN STITCH
19
20 ELASTIC METERING DEVICE WITH ELECTRONIC CONTROL
21
22
MAINTENANCE
FITTING AND ADJUSTING TRIMMING KNIVES
11.1
11.2
11.3 - SHARPENING THE KNIVES
VARIATION OF BIGHT WIDTH
ADJUSTING THREAD TENSION AND THREADING
13.1
13.2 - THREADING
13.3 - THREADING OF THE CHAIN STITCH THREAD TAKE
ADJUSTING FEED DOG HEIGHT
ADJUSTING STITCH LENGTH
ADJUSTING DIFFERENTIAL FEED RATIO
17.1
17.2 -
17.3 -
18.1
PULLER FEED (MACHINES CLASS 627 AND 629)
20.1
20.2 - PRESETTING OF THE ELASTIC FEEDING
20.3 - EXAMPLES
MACHINES WITH VARIABLE TOP FEED CLASS 640, 647 AND 649, 657
21.1
21.2 -
21.3 - ADJUSTING THE HEIGHT POSITION OF THE TOP FEED DOG
21.4 - ADJUSTING THE TOP FEED DOG'S VERTICAL STROKE
21.5 - POSITIONING THE TOP FEED DOG
21.6 - LIMITING THE TOP FEED DOG'S LONGITUDINAL STROKE (FEED STROKE)
- SINGLE NEEDLE MACHINES 617, 627, 637, 647
CHECK STANDARD SETTING
ADJUSTMENT OF FRONT
ADJUSTMENT OF REAR NEEDLE GUARD
TWIN NEEDLE MACHINES CLASS 617,627, 637, 647, 657
CHECK
FIXED REAR NEEDLE GUARD
MACHINES CLASS 620, 629, 639, 640, 649
CHECK
-MACHINES CLASS 620, 629, 639, 640, 649
CHECK
ADJUSTMENT OF FRONT NEEDLE GUARD (FOR ALL THE MACHINES)
ADJUSTMENT OF
-CONTROL
- ADJUSTING THE TOP FEED
ADJUSTING THE HEIGHT OF THE TOP FEED DOG
PRESSER FOOT ADJUSTMENT- HEADS 649-22 ....
STANDARD SETTING
STANDARD SETTING
STANDARD SETTING
REAR NEEDLE GUARD (ONLY FOR 639 AND 649 MACHINES)
BOX DESCRIPTION
NEEDLE GUARD
IN
THE PRESSER FOOT SLOTS
UP
Page 5
1 •
TECHNICAL
FEATURES
617 Ultra
620 Ultra high speed double locked chain stitCh machine Type
t1igh
speed overlock machine equipped with a small arm instead of the standard work plate,
which permits serging, welting operations, attaching of elastics,on tubular or already closed into
a ring articles, even on those of
operations etc.
The machine is
available in 1 needle and 2 needle models.
little diameter.
401
for assembly seams, binding
627 Ultra high speed overlock machine for assembly seams, serging and welting operation of elastics,
lace tapes, etc.
The machine is avaible in the
1 needle for making type
stitch.
2 needle for making type
overedging stitches.
following models:
503, two threads overedging stitch and type 504 3 threads overedging
509, three threads overedging stitch and type 512 and 514 four threads
629 Ultra high speed safety stitch machine for assembly seams,binding operations, zipper applications
etc.
The machine is available in the
2 needle for making type 515, four threads safety stitch (2+2) and type
(2+3).
3 needle for making type 401, 504, 514, 516 and
combinations can be obtained using only the necessary needles.
following models:
401
+514 stitches.
516fivethreads
The
different stitch
safety stitch
637 Overlock machine, particularly suitable for sewing operations on heavy and very heavy weight
or
fabrics
for seams which require a wide overedge bight. Fitted with long needle bar stroke.
639 Safety stitch machine, particularly suitable for sewing operations on heavy and very heavy weight
fabrics. Fitted with long needle bar stroke.
640 Double chain stitch machine Type
recommended for a perfectly paired transportation of the upper and lower plies.
401
fitted with variable top feed behind the needles. Highly
647 Overlock machine fitted with variable top feed. Particularly suitable for sewing operations on
difficult to feed fabrics, for straight-hanging seams without ply shifting and for operations which
in
require gathering
one of the ply
or
in both top and bottom ply.
649 Safety stitch machine fitted with variable top feed. Particularly suitable for sewing operations on
difficult to feed fabrics, for straight-hanging seams without ply shifting and for operations which
require gathering in one of the ply or in both top and bottom ply.
657 Overedge stitch type machine fitted with top feed, with removable small arm replacing the
traditional work plate for assembling seams on tubular or closed into ring garments even of
diameter.
small
2
-
TYPE
OF
STITCHES (FIG. 1)
All the Orion machines can be fitted, on request, with mechanic, pneumatic, eletric or electronic devices
for mechanizing and automazing certain manual operations improving output and alleviating operator
fatigue.
Ask the Rimoldi Necchi Service personnel for more detailed information about machine uses and special
devices applications, or request the descriptive leaflets from Rimoldi Necchi S.r.l.
3 -
MACHINE
The
part symbol and the size of outside diameter (D) are printed on each pulley (fig. 3).
WARNING
Run the machine at reduced speed for the first three months of use. It is suggestes to use the machine
at a speed of
documentation furnished with the machine.
SPEED
500/600 revolutions per minute lower than the maximum speed indicated on the technical
AND
MOTOR
PULLEY
TABLE
(Fig.2)
Page 6
To obtain the maximum machine performance, the speed must always correspond to the operator's skill
level
and to the difficulty of the sewing operation.
Rimoldi
maximum indicated
Necchi
S.r.l. does not guarantee the machine
or
if
the machine
is
employed for operations different than those described
if
the same
is
used
at
a speed higher than the
in
the
technical documentation.
4 - GENERAL INSTRUCTIONS
Before connecting the motor to the electric network:
Check that the connection of the terminal board inside the motor
-
-Check that the overload cut-out switch is calibrated to the same voltage as above and to the power of
installed motor
the
Check that the earthing connections are all efficient
-
If,
after connecting the motor to the electric line, the direction of rotation of the machine is opposite to the
one prescribed, the direction of rotation of the motor can be reversed just transposing between them any
of the three
polarities
in
the connecting plug, without touching the yellow-green earthing cable.
is
suited to the rated voltage
5 - INSTALLATION
5.1
- ELECTRIC SYSTEM
The electric system includes the motor cutout switch (fig. 4), the motor connecting cable and a cable without
plug. The allowed connections to the electric grid are those laid down
The power
overhead connections by fixing
N.B.- The
could
contacts.
With every type of connection, it is necessary to connectthe electric system to
earth using the yellow-green conductor (fig. 5).
cable (the blue one only) is considered to be double insulated, and therefore can be used for
it
to a suitable vertical column (e.g. the bobbin holder).
cable
must
not
be
cause
abrasions
and
threaded
cuts
in
the
through
wire
protecting
the
bobbin
sheath,
holder
by
which
the
tube
may
laws
or
any
lead
an
officially
in
force.
other
tubes
to
the
risk
acknowledged
of
hidden
which
5.2 - LAMP CONNECTION
For a self-contained light input, the RIMOLDI 019-90 is to
terminals of the overload cut-out switch.
Input E = 125/160/220/240/380/415
Adjustable output U
5.3 - CONNECTION DIAGRAMS FOR SEWING UNITS FITTED WITH SINGLE-PHASE DEVICES (for example:
SARA, RITA, SONIA, etc.)
The connections of the devices which make up the Rimoldi Necchi sewing units or sewing systems must
comply with the diagrams
three-phase and four-wire
In
the case of connection to lines with NON-distributed neutral (fig. 7), it
single-phase transformer for input voltages of 380-415V and output voltages of 220-240V 200VA between
the motor cut-out and single-phase devices, or request
Always,
The value of the motor cutout switch setting
attached to the switch box itself, according to the voltage and power of the motor used.
and adjust the setting, remove the switch cover, and turn the
the index points to the required value.
Warning:
Rimoldi heads can be fitted to common stands
following characteristics: ·
either
disconnect
=from
check
5 to 12
in
figures 6 and 7 set out for the cases of five-wire (distributed neutral) 380 V
380 V (NON-distributed neutral) electric lines respectively.
the
setting
from
the
V.
V.
20 VA
of
the
mains
50/60 Hz
motor
(in
before
cutout
amperes) must be equal to the value shown on the table
removing
in
the majority
be
used. It is to be connected to the input
is
necessary to place an approved
Rimoldi transformer
switch
or
have
special screw (or move the cursor index) until
the
cover.
of
cases, provided the stands have the
n.
it
checked
P91
0054-0.
by
competent
In
order to check
staff.
Page 7
-40 mm thick plywood wooden table.
-adjustable feet to ensure stability.
of
-ability to support a weight
-for Gemini and
It can be installed in two ways on the table:
-
-normal: work surface raised above the table (Fig. 8 -
-submerged: work surface on exactly the same level as the table (Fig. 9 -
N.B.
If it is wished to install the machine on a stand which the client already has, it is necessary to carry
out
the following operations:
-cut the table, or modify the cut if the stand already
- normal positioning -
- submerged positioning -
-replace the machine holding plate fixed to the table with the one supplied with the new head.
A)
NORMAL
a) Level stand
b)
Fit the machine holding plate by proceeding as follows:
- place the 2 long bolts E and 2 short bolts
c)
Place rubber bushes G and spacers H into the 2 holes (one back and one front) on the right
holding plate F Fig. 8a). This should be done
operator's point
d) Connect the 2 crosspieces
left
of
plate F), two washers Q and two nuts M (do not screw nuts M
e)
Place rubber bushes G abd spacers H
f)
Place washers I onto rubber bushes G
g)
Slip two spacers
h)
Positioning machine holding plate
rubber bushes G (Fig.8a)
i)
Slit the four washers L which should rest on rubber bush G onto the four nuts E and
I)
Slip on 2 long bolts E 2 washers
m) After fitting washers L onto nuts E and E1, tighten nuts M completely (Fig. 8a)
n)
Fit the 4 support C with respective nuts D onto the machine holding plate F (without locking them) and
the washers (Fig. 8 and 8b)
Insert the 4 rubber pads A on the 4 pins C (Fig. 8 and 8b)
o)
p)
Take
hold
q) By adjusting support pins
the table Level the head by adjusting pins
N.B. This operation is always carried out with
r)
Connect the drive belt
the motor pulley supplied with the head.
characteristcs
(vertical plane).
Adjust the belt tension:
a load of about 1-2 kg.
s)
Connect tie-rod B to the machine presser foot lift lever N
(Fig. 8b).
feed-off-the~arm
Encl. B
POSITIONING (Fig. 8 -
of
view.
R1
and two washers S onto short bolts
of
the head as shown in enclosures A and A 1 and place it on the 4 rubber pads A (Fig.
of
the head. Check that the drive belt is on a plane at right angles to the pulley axes
at least 200 kg. stably (head + motor, and any other devices).
heads, it is advisable to use original Rimoldi stands.
8a-
8b).
9a-
9b).
has a table, bearing in mind that:
Encl. C
8a-
8b)
E1
into the four 10 mm. diam. holes in the tables (fig. 8a)
of
by
obseNing
F1
to plate F with two bolts P (which should be fitted into the holes in the
in
the remaining holes in crosspieces
F,
prepared as above, by fitting it onto the 4 bolts E and
Land
2 spacers R (Fig. 8a)
C,
set the height
(1
Ox6
mm. cross section) to the motor and head pulleys (handwheel). Only use
the
tension is correct when a camber of about 10-15 mm. is created by placing
in
the position shown in the figure 10.
of
the head, making sure that it protrudes from the plane of
C
the
trapezoidal drive belt detached.
In any case, never exceed the maximum speed shown in the
the plate placed on the stand from the
rigt1t
down - Fig. 8a)
F1
E1
(Fig. 8a)
E1
(Fig. 8a)
of
the holding plate F and stand pedal
machine
E1
using
8)
SUBMERGED
B)
a) Level stand
b)
Fit the machine holding plate by proceeding
- place the 2 long bolts E and 2 short bolts
c)
Place rubber bushes G and spacers H into the 2 holes (one back and one fropnt) on the right
holding plate F (fig. 9a). This should be done
operator's point
d) Connect
with two bolts
M,
which should not be screwed right down (Fig. 9a)
POSITIONING
of
the
2 crosspieces
P
(which
(Fig.9-
view.
F1
(upside down compared to the normal positioning - Fig. 8a) to plate F
shold be fitted into the holes in the left
9a
-9b)
as
follows:
E1
into the four 10 mm. diam. holes in the tables (Fig. 9a)
by
observing the plate placed on the stand from the
of
plate
of
machine
F)
two washers Q and two nuts
Page 8
N.B.The bolt
e)
Place rubber bushes G and spacers H
f)
Slip whashers I onto bolts E and
g)
Slip spacer R onto bolts
(Fig. 9a)
h)
Positioning machine holding plate
rubber bushes G (Fig.9a)
) Slip the four washers
I)
Tighten nuts M
on
the bolts P (Fig.9a)
m)
Fit the 4 support C with respective nuts D onto the machine holding plate F (without locking them) and
the washers (Fig. 9 and 9b)
n)
Insert the 4 rubber pads A on the 4 pins C (Fig. 9 and 9b)
o)
Take
l1old
p)
By adjusting support pins
tha table. Level the head by adjusting pind
N.B. This operation is always carried out with the trapezoidal drive belt detached
q)
Connect the drive belt
the motor
characteristcs of the head. Check that the drive belt is on a plane at right angles to the
(vertical plane). Adjust the belt tension: the tension
created by placing a load of about 1-2
r)
Connect tie-rod B to the machine presser foot lift lever N of the jolding plate F and stand pedal (Fig. 9b).
P,
respect to fig. 9b, will be assembled on its own head under the plate
in
E1
(Fig. 9a)
E,
and spacer
F,
prepared as above, by fitting it into the 4 bolts E and
L,
which should rest
on
the 4 bolts E and
of the head as shown
C,
set the height of the head so that work surface T (Fig.
(1
Ox6
mm. cross section) to the motor and head pulleys (handwheel). Only use
pulley supplied with the head.
E1
in
enclosures A and A 1 and place it
the remaining holes
R1
onto bolts E1. Place four washer I onto rubber bushes G
on
rubber bushes
and lock them down. At this point, lock down the two nuts M
C
In
any case, never exceed the maximum speed shown
is
correct when a camber of about 10-15 mm. is
kg.
in
the position shown
in
crosspieces
G,
onto the four bolts E and
on
in
the figure 10.
F.
F1
E1
E1
(Fig.9a)
the 4 rubber pads A (Fig.
9)
is aligned with
pulley axes
using
9)
in
the
N.B. Incorrect installation
of
the
machine on the stand can lead
to
more noise and vibrations than
stated by the manufacturer.
In
particular, noise and vibrations can increase when:
-Non-original rubber pads are used.
-Non-original spare parts are used.
-The belt is not adjusted correctly (too slack).
-Non-original or unsuitable supports are used.
-Bobbin holders which are
-Guards and work surface have been tampered with or not fixed correctly.
NOTE: the packing material
nbt firmly fixed to the support are used.
should
be disposed
of
properly.
6 - LUBRIFICATION
6.1
-FILLING WITH OIL
Warning: the machine
necessary
to
fill
it
is
using
the special oil
supplied
without
for
lubricant, therefore, before starting the machine,
industrial sewing
machines-
the machine itself.
In
order to fill it or later top it up, proceed as follows:
-Unscrew transparent cap A (Fig.
-Pour
-Check the amount poured
-Screw cap A back on.
WARNING: always use
advisable
recommended
forfeiture
Only
32M oil recommended by the manufacturer:
-
AGIP OTE 32
-
MOBIL DTE LIGHT
-TEXACO
in
the contents of the RIM 32M oil tin supplied with the machine.
in
line (MAX) or
fall below the lower one (MIN).
RIM
to
mix
oils
of
different types. The use
or
the addition
of
the guarantee.
in
special situations, it is possible to use one of the following types of oil as
REGAL OIL 32
11
).
through sight glass D (Fig.
11
).
The oil level must never exceed the upper
32M both when the oil is changed and when
of
of
additives can lead
lubricating
to
oils
of
irreparable machine damage and the
RIM
32M
- provided
it
is
topped up. It
a different
an
type
alternative to the RIM
to
it
is
with
is
not
the oil
Page 9
6.2 - DISPOSAL OF USED OIL
Incorrect disposal of used oil causes serious pollution problems for man, animals, and the environment.
It is therefore necessary to dispose of the oil by carefully following the instructions below:
1)
RIM 32M lubrication oil
USED MINERAL OILS"
2)
The used oil must be collected
3)
The oil should be delivered to a legally authorized body.
6.3-
OIL CHANGE (Fig.12)
To empty the oil out of the sump, unscrew the drain plug A on the lower part of the sump.
Dismount the sump from the base of the machine unscrewing the 5 screw that fix it and
with gasoline or petroleum the filters
Blow the filters with low pressure air before remounting.
Check the drain
Remount the drain
7 - MAINTENANCE
plug gasket and replace with a new one, if it is damaged.
is
totally mineral, therefore after use it is categorized among the 'TlECLAIMABLE
in
a suitable container used exclusively for this purpose.
C,
D,
E and
plug with gasket on the sump.
WARNING
change or clean
F.
BEFORE CARRYING OUT MAINTENANCE OPERATIONS, DISCONNECT THE EQUIPMENT
MOTOR FROM THE MAIN ELECTRIC
DOES NOT
BEFORE RECONNECTING TO
ALL
COVERS
REMOVED
NONCOMPLIANCE WITH THESE
The periodic maintenance operations to be carried out
working order are:
START
HAS
WHEN THE
HAVE
BEEN CLOSED AGAIN
BEEN REPLACED.
AND
PNEUMATIC CIRCUITS,
PEDAL
THE MAIN ELECTRIC
IS PUSHED.
SAFETY
AND
RULES
ALL
MAY
in
AND
MAKE
AND
PNEUMATIC CIRCUITS,
PROTECTION
PUT PEOPLE
order to keep the machine constantly
AT
SIJRE
WHICtl
RISK.
'THE
MAKE
MAY
.iAVE BEEN
MACHINE
in
Every day.
Clean all the moving machine parts related to feed and stitch formation with a brush.
Check the
Check the oil level and,
To clean the machines sewing area, remove the work plate.
For the 627, 637 and 647 class machines this is done by inserting the tweezers A or a screwdriver
under the work
the work plate is separated from the magnet.
For machines
N (Fig.14), and
If the machine is equipped with 135 or 235 chain cutting device,
is necessary to
needle point and needles.
if
necessary,
plate 8 as shown
class 620, 629, 639, 640 and 649, the work plate is removed by opening the front cover
lifting it until it is separated from the magnet.
slide it toward the rear part. of the machine.
in
top
up before starting the daily activity.
figure 13 and then lifiting the tweezers as
in
order to remove the work plate it
~3hown
in figure 13 until
Every Week.
-Remove the needle plate and clean the feed dogs and looper with a brush.
AND
SUBE
perfect
Each month.
-Check the wear of the belt.
-Check the wear of the needle guard.
Every three months
If the machine is equipped with subsidiary filter, unscrew the transparent cap A (Fig.11) and remove the
filter. Clean it with gasoline or petroleum and blow it with low pressure air before remounting.
Page 10
Every
six
months
-Replace the oil and clean the filter (see
II
Every three months''). N.B.
-If
RIM
32M oil is not used, replace
it every three months.
IMPORTANT If the machine is emploied for sewing fabrics which produces a lot of dust, the change of
oil and of filters must be more frequent.
Every
two
years
Replace the oil filters of the sump when using oil
For this operation, dismount the sump from the base of the machine unscrewing the 5 screw that fix
Unscrew the screw
When using a type of
B,
remove the filters
C,
oil different than RIM32M, it is necessary to replace oil every year.
RIM
32M.
D,
E and F and replace with new ones (fig.12).
it.
After a long
period
without
use
If the machine is not used for a long time, it is necessary to cover it with the cover provided.
Before
starting
to
use
it
again,
carry
out
the
following
operations:
-Check the oil level and, if necessary, top it up.
-Check that
all the accident-prevention guards are
-Connect the machine to the main
Oil the needle bar with
-
-
Run
the machine at low speed
RIM
32M oil.
~3000
electric and pneumatic circuits.
rpm for about 10 seconds and check that oil flows under the
in
place and perfectly operative.
transparent filling cap.
8 The machine weighs is 36
TAKE
TRANSPORT
Kg.
HOLD OF THE HEAD
AS
SHOWN
IN
ENCLOSURES A and
A1
(INSTALLATION)
9 -REPLACING THE NEEDLE (FIG. 11)
needle is inserted into the hole of the needle clamp and is fixed by the allen screw F (Fig. 9).
The
1
·•
To replace the needle,
by pressing the pedal:
·
1)
Turn the handwheel manually to raise the needle to its top position.
2)
Lower lever
3)
Slaken needle-locking screw
Land
the same system as indicated
Take into consideration that the
switch
off
the
motor
and make sure that the machine has stopped completely
turn the presser foot towards the left side of the machine.
F,
remove the needle and replace it with a new one, which must be of
in
the label of the machine.
looper passage groove must be turned towards the rear part of the
machine.
4)
Tighten screw F without forcing it, taking care not to alter the needle orientation.
5)
Bring the presser foot back to its normal working position.
After
replacing the needle, remember to position the finger protection plate correctly namely
so that the finger tips cannot reach the needle points neither upward nor downward.
in
a position
10 - PRESSER FOOT PRESSURE (FIG. 11)
To adjust the pressure of the presser foot, loosen screw
direction to increase the pressure and
ATTENTION: THE NEW 11LOW INERTIA
ACTION
11
11.1 -
IN
ORDER TO FEED THE FABRICS PROPERLY.
-FITTING AND ADJUSTING TRIMMING KNIVES
Bottom
knife
in
counterclockwise direction to decrease
11
PRESSER FOOT REQUIRES A VERY LIGHT PRESSURE
I and turn the knob
To fit and adjust the bottom knife proceed as follows:
M:
turn the knob
it.
in
clockwise
Page 11
1)
insert knife
above the work
2)
make sure that the knife holder D moves freely
in
the seat
on
knife holder D (Fig.15), taking care that the cutting edge does not project
plate, then tighten screw A
in
its seat and then position
it
to suit the bight width
required
3)
lightly tighten screw B
4)
position the top knife touching the bottom one and slacken screw B
so
that spring C creates the right
pressure between the two knives
5)
tighten screw
11.2 - Top knife
The machine can be equipped with one of the top knife assemblies represented
To fit the top knife (fig. 16a) proceed as
1)
position the knife
2)
turn the handwheel till the top knife assembly reaches its bottom dead point and check that the cutting
is
edge
0,8
B.
follows :
in
the seat
mm
below the cutting edge of the bottom knife.
on
knife holder E and lock with screw F
in
Fig.16a and 16b.
If the knives are not
in
the exact position, loosen screw F and move the top knife assembly towards right
to lower the top knife edge or towards left to raise the top knife edge.
Slide the top knife
To fit the top knife (fig. 16b) proceed as
1)
position the knife
2)
turn the handwheel till the top knife assembly reaches its bottom dead point and check that the cutting
is
edge
0,8
If the knives are not
in
its oblique seat to maintain the correct contact between the two knives.
follows :
on
knife holder E and lock with screw F
mm
below the cutting edge of the bottom knife.
in
the exact position, loosen screw F and move the top knife up or down.
To maintain the correct contact between the two knives loosen screw G and properly move the knife
assembly.
11.3 - Sharpening the knives
The knives should be sharpened periodically using the Rimoldi Necchi RASA S001-02 (50/60Hz 220V)
and Rimoldi Necchi RASA S002-02 (50/60Hz
11
OV)
and the special block 990322-0-10 (supplied
on
request) which ensures the correct sharpening angle.
12 -VARIATION OF BIGHT WIDTH
The needle bight width A (fig. 17) is measured between the needle and the right edge of the needle plate
finger.
The bight width can
For varying
See needle
it
plate
be
varied slightly by adjusting the position of the trimming knives.
beyond certain limits the needle plate must
on
request
on
Technical Documentation.
be
changed.
13 -ADJUSTING THREAD TENSION AND THREADING
13.1
- Adjusting thread tensions (fig. 11)
The treads coming from thread guide bracket B are pressed between two tension discs.
Therefore to obtain the correct stitch formation the pressure of the spring must be adjusted by turning
tension knob
C.
Be careful not to screw it down too tightly as this could cause thread breakage.
13.2 a Threading
For the correct threading of the machine, see the threading chart or the threading sketch glued inside
the loopers cover.
The various ways of threading the
11
tension plates
II
to suit the kind of thread used are illustrated
A- cotton threads
B-
woolen, helanca, dralon threads and all soft threads generally
very twisted threads
C-
in
Fig.18.
Page 12
13.3
- Threading
For threading the chain stitch thread take up operate as follows:
1)
Open the front cover N (Fig.14) and pull out the sliding thread guide (fig.19)
2)
Thread the chainstitch looper thread through the small tube B with its threading wire
from the front of the machine)
3)
Take the thread which has come out of tube
hole
from
continue to thread the chainstitch
When the threading is finished, push back the sliding thread guide A and mount the work plate.
When pushing back the sliding thread guide, make sure that the portion of the thread
between
Also make sure that the high point on the lower take-up cam L begins to take-up thread from the looper
at the same time as the needle reaches top dead point.
14 -ADJUSTING FEED DOG HEIGHT
holes D and E is securely inserted
of
the
chain
on
thread guide C to holes
stitch thread
on
thread guidesD and E through slit
looper.
take
up
(machines
B,
threading it
in
the cut out between the thread guides H and
class
in
sequence:
620,
629, 639,
(to
F,
then thread guide G and
640
be
and
649)
threaded
in
tension
K.
With the feed dogs
to the value indicated
To obtain this setting
and move the feed dog up or down.
If the machine is equipped with chain feed dog with one row of teeth (Fig.21 a), this must not project from
the
needle plate surface when the feed dogs are
If the machine is equipped with chain feed dog with two rows ofteeth (Fig.21
than the feed dogs.
15 -ADJUSTING STITCH LENGTH
To adjust the stitch length proceed as follows (fig.11
1)
turn the handwheel and press the push button E until it
adjustment eccentric.
ATTENTION: For machines class 620, 629, 639, 640 and 649 open the front cover N (fig.14)
to push the pushbutton
2)
turn the handwheel:
-
in
clockwise direction (as shown by the arrow
in
counter clockwise direction to shorten the stitch.
-
3)
release the push button
Make some sewing tests to verify if the stitch length
16 -ADJUSTING DIFFERENTIAL FEED RATIO(*)
The differential feed ratio is the ratio between differential feed dog stroke and main feed dog stroke.
When the differential feed dog stroke is greater than main feed dog stroke, the fabric
during sewing (positive differential feed).
This
differential feed ratio is particulary suitable for obtaining perfectly straight-hanging seams
knit and
When the differential feed dog stroke is less than main feed dog stroke, the fabric will
sewing (negative differential feed).
This
To adjust the differential feed ratio proceed as
1)
2)
The stop H is preset at the factory according to the
position must not be modified.
elastic fabrics and for gathered seams
differential feed ratio is particularly suitable for seaming woven and warpknit fabrics.
loosen button G and slide it up for gathering the fabric (positive differential feed)
slide button G down for stretching the fabric (negative differential feed).
in
their highest position, the distance they project from the needle plate must be equal
in
the Technical Documentation.
loosen the fixing screw A for main feed dog and B for differential feed dog (Fig.20)
in
their highest position.
b),
this must
be
0,2 mm lower
(*)
):
is
E.
E.
completely inserted
in
the drawing) to lenghthen the stitch.
is
the desired one.
in
general.
follows (fig.
11
):
application characteristics of the machine and its
in
the notch of stitch
in
will
be
gathered
on
be
stretched during
order
weft
(*)
The maximum stitch length and the minimun and maximum differential feed ratio, indicated for each
subclass
obtained as indicated
of
mechanical part inside the machine.
in
the Technical Documentation, refer to the standard sampling of the machine and can be
·in
chapter 15 and 16. Different values can be obtained by the proper adjustment
Page 13
17 -NEEDLE GUARD ADJUSTMENTS FOR OVEREDGE STITCH
Adjustment
taken off the machine.
17.1
of
-Single
the needle guards must be done, when the needle plate and differential feed dog have been
needle machines 617, 627, 637 and 647.
Check standard setting.
Turn the handwheel until the lower looper point is in the centre of the needle scalf (Fig.22), as
is moving towards top dead centre and check:
Distance between looper point and needle
1) With needle size
touching it (fig. 23).
2) With needle size
- 0 ,05 mm) from the scalf
80 and smaller, the lower looper point must brush the scalf
90 and larger, the lower looper point must be 3 - 5 hundreths
of
the
needle (fig. 24)
of
the needle without
of
a millimetre (0,03
Adjustment of front needle guard
Height
The height of the bevel
B (figs. 23-24) depends on
eye
1)
On machines with 3 mm thick needle plates the front needle
(fig.25)
2)
On machines with 4,25 mm thick needle plates, the front needle guard A must be 1.3 mm
sleeve
To obtain this, loosen screw D (Fig.27) and adjust front needle guard
of
the looper holder C (fig.26).
of
the front needle guard A (figs. 23-24) in respect to the upper part
the
thickness
of
the needle plate.
guard A must
as
specified above .
be pushed down in its holder
of
Distance from the needle
1) With needle size
To achieve this it is advisable to set the machine up with a needle which is
smaller than the size to be used on the machine. (example: with an
mm)
etc.) therefore loosen screw
flexing it (Fig.28a).
Replace the original needle
2) With needle size
(Fig.28c).
80
or smaller,
90
and larger, the front needle guard must brush
the
front needle guard A must flex the needle B slightly (figs. 23-24).
E (fig.27) and push
that
had been removed and which is slightly flexed (Fig.28b).
the
front needle guard till it touches the needle without
1/10
of
a millimetre {0, 1
80's
needle, use a 70's needle
the
needle without flexing it
the
needle
the needle
above
the
Adjustment of rear needle guard
Height
The
bevel on the rear needle guard F (Figs. 27 and 29) must be slighty lower than the needle eye
To
achieve this, loosen screws G and H (Fig. 27) and properly set the rear needle guard .
B.
Distance from the needle
With any size needles,
needle size 80 or smaller and fig.29b for needle size 90 or larger).
H (Fig. 27) and set
WARNING
After every adjustement, make sure that the thread passes freely even when the needle is in conctat with
the rear needle guard.
17.2
-Twin
needle machines 617, 627, 637, 647 and 657.
as
the
rear needle guard F must brush the needle without flexing it. (see fig.
To
achieve this, loosen screws G and
above.
29a
for
Check standard setting
The
setting and possible adjustment
in the centre of the needle
left hand needle (Fig.31 a) and subsequently on the right hand needle (Fig.31 b), following the instructions
given for single needle machines.
To
adjust the position
D (Fig. 27) taking care not to
scalf (Fig.30), as the needle is moving
of
the
front needle guard A so that it is parallel with both needles, loosen screw
vary
of
the rear needle guard is carried
the
height
of
the needle guard.
out
towards
always with lower looper point
top
dead centre, firstly on the
Page 14
When the front needle guard A and the rear needle guard
against the rear needle guard and move the lower looper to the right: the point of the looper must not touch
the scalf of the needle.
Fare
in
their correct position push the needle
Fixed rear needle guard (on request)
The movable rear needle guard can be substituted on request for a fixed rear needle guard L (fig. 32).
The correct adjustment of the front needle guard A and rear needle guard L corresponds to those
in
described
On the twin needle machines, to adjust the position of the needle guards so that they are parallel with both
needles (fig. 33), loosen screws D and M (fig. 32) taking care not to vary the height of the needle guards.
previous paragraphs.
17.3 - Machines class 620, 629, 639, 640 and 649.
Check standard setting
To check the position of the overedge stitch needle guards, see instructions as per 627 single or two
needle machines.
N,
To adjust front needle guard
loosen screws 0 (fig.34).
18 -NEEDLE GUARD ADJUSTMENTS FOR THE CHAIN STITCH
18.1
- Machines class 620, 629, 639, 640 and 649.
Check standard setting
Turn the handwheel until the chain stitch looper point is in the centre
is moving towards top dead point and check that the looper point brushes the scalf
touching
it.
of
the needle scalf, as the needle
of
the needle without
Adjustment of front needle guard (for all the machines)
Distance from the
1)
With needle size 80 or smaller, the front needle guard A (fig. 35) must flex the needle slightly.
2)
With needles ize 90 and larger, the front needle guard A must brush the needle without flexing it.
To flex the needle to eliminate
For machines class
(fig.36).
For machines class
needle
play between the looper point and the needle scalf pro-ceed as follows:
620, 629 and 640 loosen screw
639 and 649 loosen screw
B,
and push front needle guard towards needle (fig.35).
P,
and push front needle guard Q towards needle
Adjustment of rear needle guard (only for 639 and 649 machines)
Distance from the
With any size needles the rear needle guard C must brush the needle without flexing it.
To achieve this loosen screw D and set as above.
needle (Fig.35)
19 -PULLER FEED
Machines
The auxiliary top roller feed
drop feed.
roller movement is synchronized with the feed dog movement but can be regulated separately by
The
means of the adjustable cam set on the main shaft .
To make the adjustement turn screw A (fig.37): in cauter clokwise dyrection, towards the
increase the rotation speed of the
it.
class 627 and 629
in
the presser foot, in front of the needles, works
roller
in
conjunction with the main
in
clockwise dyrec-tion, towards the minus sign (
plus
-)
to decrease
sign(+)
to
NOTE - To facilitate needle threading, bring the needles to their top position, move lever B (fig. 37)
towards the right and turn the
The arm can be made to turn to the second stop release point, by
IN
THIS POSITION DO
Bear
in
mind that when the machine is not running and without fabric, there must always be a distance
of
0.1
- 0.2 mm. between the toothed roller and the needle plate. this distance is obtained by adjusting
J.
screw
roller arm until the first stop release point is reached
pulling pin C downwards.
NOT
START
THE
MACHINE OR TURN THE HANDWEEL MANUALLY!
Page 15
The puller lift device
Dis
supplied with three interchangeable cams that permit different roller lift distances
from the needle plate to be obtained as indicated
in
the following table:
CAM
0.6
PULLER LIFT
da
o a 0.9mm
1 da 0 a 1.5mm
2
Intermediate lift distances are obtained by moving lever
When fitting on one of the cams supplied, remember that lever E must be
H must be
This condition is obtained by turning screw
Roller pressure on the fabrics is
20 -ELASTIC METERING DEVICE WITH ELECTRONIC
in
its right position, touching the right stop plate.
da 0 a 3mm
adjusted
J.
by screw G.
Eon
quadrant F (fig. 37).
CONTROL
in
position 110
11
and that slider
The metering roller are actuated by a D.C. motor controlled by a microprocessor.
The desired amount of elastic to be fed is obtained by adjusting the counters of the control box.
It is advisable to use the 013-51 device so as to avoid uneven elastic tensioning that may arise between
roll of elastic and the metering rollers.
the
20.1 -
Counters
Counter
values A
press
Control
II
orB
box
II A II
description
and
II
B II for presetting two different feeds of the elastic tape.
(Fig. 38)
G II for presseting a secondary feed of the elastic tape by which, when required, the feeding
can be varied during the seam. To obtain this feed it is necessary to press the right knee
control.
11G11
Counters
Counters
II A'.,
II
s·.,
11
II
H
for presetting the length of elastic tape to insert under the presser foot at the beginning
11
II G,
for presetting the decimals of feeding values 11A
of the next seam by heel-pressure on the threadle (used only on machines fitted with
11
~~s·•
•
351
and 352 special
device).
Counters
11
n K
used only with
351
and 352 special device, to get a gathering action at the beginning
of
the seam. The desired gathering action is obtained by automatically stopping the elastic rollers for the
number of stitches preset on the counters K (x 10
11
Selector
Lever
tape between the
Switch
20.2 -
11
8/A
for the choice of the preset elastic A or
11 M 11
it is used for running the rollers when the machine is off, to facilitate the insertion of the elastic
roller .
II
P II ON/OFF switch for the electronic control box.
Presetting
of
the
elastic
feeding
=ten
x 1 = unit).
B.
The presetters A B G are adjusted by a number wich can be calculated through the following formula:
= L : (0.2 x N )
V
V = number to be set
L
= requested
N
=total
finallenght
of the fabric (in millimeters) after application of the elastic tape
number of the stitches included
in
the lenght L of the fabric
0.2 = specific corrector value of the device
Page 16
The value N is obtained by dividing the initiallenght of the fabric
in
the seam
(in
millimeters).
(in
20.3 - Examples:
MAKING-UP LADIES1PANTIES:
A) Attaching elastic tape to legs openings without gathering
Lenght·of the fabric before seam = 410 mm
Stitch Lenght = 2.2 mm
N=410=186
2.2
millimeters) for the stitch lenght used
Required length of the fabric after the seam
V = 410 : ( 0.2 X 186) = 410 : 37.2 = 11.0
410 mm L = 410
The number to be preset is 11.
B)
Attaching elastic tape to waist with gathering
Length of the fabric before
Stitch length = 2.2 mm
N =
680 =309
2.2
Required length of the fabric after the seam
V = 540 : (0.2 X
309)
seam=
= 540 : 61.8 = 8.7
680 mm
540 mm L = 540
The number to be preset is 8.7
NOTICE : carry out a few sewing tests and adjust the preset theorical numbers which may vary to the
thickness or the elasticity of the fabric and of the elastic tape
Never preset a number that exceed 30.
21
-MACHINES WITH VARIABLE TOP FEED CLASS 640, 647 AND 649, 657
Feed with a top feed dog serves to cooperate with the bottom feed dogs
for any type of fabric.
Machines with top feed make it possible to:
- Perform
..
drop seams
..
perfectly without fabric slippage
- Perform seams that require a constant or variable abundance of fabric
fabric
ply
in
order to obtain a perfect feed
on
the top or bottom
- Perform seams with gathering on the top or on the bottom ply, with the possibility of eliminating
the gathering with the machine running (647-22/23 and subclasse).
The top feed and the bottom feed can be set independently of each other so that gathering or fullness can
be added to the lower or top ply.
21.1 - Adjusting the top feed
To vary the top feed with respect to the bottom feed it is necessary to loosen screw A
act
on
lever B pushing it downwards to increase the top feed and pulling it upwards to reduce the top feed.
The machines belonging to the 647-22/23 and 649-22/23 (gathering) subclasses are equipped with a
knee press operated device for variyng the top feed with the machine running so that a gathering effect
on the top fabric
To pre-set the top feed's range of variation it is necessary to loosen the nuts blocking screws C and D
fig.40 and to shift the screws upward
to decrease
The minimum top feed
(which may vary between subclasses according to the machines usage characteristics) is established
the factory through the positioning of a block inside the machine. (See quota X
ply is obtained (see fig. 40).
it.
is
obtained by placing screw C
in
order to increase the top feed or to shift them downward
in
its lowermost position, while the minimum value
in
fig.39 and to
in
in
the chapter "Limiting
order
in
Page 17
tt1e
top feed dog's longitudinal stroke").
To
avoid needlessly straining the internal block when moving
this screw in the
-Loosen the nut that
-
Press the knee press
-Makes sure screw D
NOTE:
equipped with device 115-12 for activating the
at extra cost).
The
following manner:
blocks
obtain gathering effects in the top fabric ply with
screw
D and shift it to uppermost position
as
far as it goes, move
locks in place for lever B intervening before
screw
differential with
screw
D upward, it is adviseable to position
D until it is against lever B and tighten the nut
the
internal block
the
machine running the machine must be
the
machine running (available on request
21.2 -
NOTE:The top feed dog's teeth, when it is in its lowermost position and when the botton feed dog is
its uppermost position,
The
must
According to the fabric's characteristics or thickness it
To
B
Once
screw
NOTE:
mm.by
If a larger variation should be necessary request
explained in
21.3 -
The
standard
fig. 42b for heavy and very heavy fabrics).
To
-Position the needle at its uppermost point
-Remove top cover
-Loosen screw E in fig.43 and introduce a spacer between
-Rotate pin K
-Rotate the
-Tighten screw E
-Loosen screw Q (fig. 44) and rotate feed dog
-Move the presser foot
Adjusting
minimum distance "M" (fig. 41) between the
correspond to the distance indicated on
perform this essential change it is necessary to loosen screw A in fig.
clockwise to reduce distance "M" and counter- clockwise to increase it.
the adjustment is made check that the top feed dog
A completely.
The
factory setting conditions make it possible to obtain a difference in the top feed dog
acting on eccentric pin
Adjusting
height position
sampling norms
perform this variation precede
quota
"M" desired.
the height'
SHOULD
U1e
next chapter.
the
height
of
the top feed dog can be varied for sewing fabrics
Lin
until the top feed dog touches
clamp F until rubber pad H
of
the
top
NEVER
B.
position
of
available subclasses (see fig.42a for light and medium heavy fabrics and
as
follows:
fig. 43
lift lever R (fig. 44) against
feed
dog
TOUCH
of
the
in
THE
BOTTOM
two
feed dogs with
the
setting chart included with every machine.
may
does
the
help
of
top
feed
dog
the
spacer placed between the feed dogs.
is against the extension G
lift lever P until its end is 0,5 mm. from lever N.
the
base and tighten screw Q completely.
FEED DOG'S TEETH.
the
needle in its uppermost position
be necessary to change this distance.
not touch the bottom ones and tighten
the
mechanic to perform the adjustment
of
the top
and botton feed dogs equal
of
41
and to rotate eccentric pin
of
+I-
thicknesses different from the
to
sector C.
in
0.7
the
21.4 -
Variation
thicknesses (intersections with cross seams or
fig. 45a).
For gathering sewing machine
be spacious (see fig.45b) and
feeding phase it is always in contact with the plate that separates it from
To
-Position the needle at its lowermost point
-Remove top cover L (fig.43)
-Loosen nut
-Tighten nut B
Adjusting
of
the top feed dog's vertical stroke
adjust the top feed dog's vertical stroke procede
by
the arrow to increase the feed dog stroke's height and in the opposite direction to reduce it.
the
top
feed
dog's
vertical
classes 647-22/23 and 649-22/23 the
the
feed dog must also be height positioned so that during the whole
Bin
fig.43 and slide pin A inside the opening in sector C, moving it in the direction shown
completely.
stroke
may
be necessary to perform
seams
of
semi-finished pieces with parts attached) (see
as
follows:
seams
top
feed dog's vertical stroke must
that encounter different
the
bottom feed dogs.
Page 18
21.5 - Positioning the top feed dog
in
the presser foot slots
To center the feed dog
to move the feed dog
in
the feed dog slots it is necessary to loosen the damper rings D
lift pin K as necessary.
in
fig. 43 and
21.6 - Limiting the top feed dog's longitudinal stroke (Feed stroke)
NOTE: These instructions pertain to adjustments to be made only
disassembled to replace parts or to
be
overhauled.
Before preceding with these regulations read the instructions carefully
in
the case that the machine has been
in
order to return to the original
setting conditions.
-Set the stitch
11
REGULATION OF THE STITCH LENGTH'.
-Rotate the handwheel manually bringing the
length at the maximum, acting on the stitch regulation button as indicated
lower feed dog to the end
oft
he feed stroke (opposite side
in
the chapter
the operator).
-Loosen screw A (figs. 39 and 46}.
-Remove cap B (fig.46) located on the back of the machine and the top cover L (figs.43 and 46).
-Loosen screw
C (fig.46) and rotate arm D until it is
in
the position illustrated. The arm must be
vertical position.
-Tighten screw
-Loosen the screw of clamp
-Position clamp E so that quota 'X''
-Tighten clamp
C.
E.
in
the setting chart is obtained.
E.
This operation prevents the operator from setting the feed dog stroke beyond the
recommended maximum for the machine, damaging the presser foot and the feed dog.
in
-Tighten threaded pin F along its axis by means of screw A (figs.39 and 46)
order to prevent untrained
personnel from varying the top feed dog's stroke, modifying the feed conditons set by the technician
or by the operator.
in
21.7 - Gathering platen adjustment- heads type 647/649-22
Make sure that the eccentric pin E is positioned
- above platen A for heads type 647-22
- below platen A for heads type 649-22
....
..
..
Loosen screws B and adjust the longitudinal position of platen A to about
indicated
the gap between the plate
in
the figures. Loosen screws C and turn platen A with its mounting on the eccentric pin E until
itself and the needle stop is about 0.5 mm. Tighten screw
adjustments and using triacetate fabric, a gathering ratio of about
in
the lower edge is obtained.
By slightly increasing the gap of
obtained
On
in
the upper edge but with a consequent reduction
the other hand, by reducing the 0.5
0.5 mm between needle stop and platen, a higher gathering ratio is
mm
in
the figs. 47 and 48. The plate D must be:
..
11
mm from the needles as
C.
With these
50% both
in
the gathering of the lower edge.
in
gathering the upper and
gap between needle stop and platen, the opposite efect is
Loosen screw A and, with a screwdriver, turn eccentric pin B so as to free it from the plates on the rear
slide
C,
making sure that the rear slide rests flat on the needle stop; then turn eccentric B anticlockwise
until the front slide D presses on platen
Tighten screw
A.
E.
Page 19
FAULT: UNEVEN STITCHES
22
-TROUBLE SHOOTING CHART
Probable cause
1 Wrong threading
2 Thread thicker than needle eye
3 Threads irregular thickness
4 Thread stand wrongly installed
5 Lower knife wrongly positioned
6 Knives do not trim because are wrongly posi-
tioned
7 Knives do not trim neatly because are worn- out
8 Needle blunt
Inadequate thread tension
9
10 Inadequate feed dog height
FAULT:
HOLES
IN
FABRIC
Probable cause
1 Needle blunt
2 Needle size unsuitable for needle plate slot
3 Unproper needle point
Solution
1 Rethreading correctly
2 Use proper needle
3 Use good quality threads
4 Reset thread stand
5 Readjust lower knife
6 Readjust knives
7 Sharpen or
8 Replace needle
9 Readjust thread disc pressure or thread guides
position
1 0 Readjust feed dog height
repla--ce
with new knives
Solution
1 Replace needle
2 Replace needle or needle plate
3 Use proper type of needle point
FAULT: THREAD BREAKING
Probable cause
1 Poor quality of thread
2 Thread thicker than needle eye
3 Wrong threading
4 Thread tension too tight
5 Needle wrongly
6 Needle blunt
7 Thread stand wrongly
8 Overheating of needle
9 Needle guards badly adjusted
1 0 Wrong setting of needle and loopers
11
Needle, looper, needle plate and thread
guides worn-out
12 Loopers blunt
installed
installed
Solution
1 Use good quality thread
2 Use proper needle for fabric and thread
3 Rethreading correctly
4 Readjust thread disc pressure
5 Reset needle correctly
6 Replace needle
7 Reset thread stand
8 Use needle cooler device or thread lubricator
device
9 Readjust needle guards
1 0 Readjust needle and looper settings
11
Grind off, polish or replace with new ones
12 Replace loopers
Page 20
FAULT: SKIPPED STITCHES
22
-TROUBLE SHOOTING CHART
Probable cause
1 Wrong threading
2 Needle wrongly installed
3 Needle bent or blunt
Inadequate thread tension
4
5 Loopers blunt
6 Needle guards badly adjusted
7 Wrong setting of needle and loopers
FAULT: NEEDLE
Probable cause
1 Too strong fabric pulling by operator
2 Wrong needle size
3 Needle wrongly
4 Needle guards badly adjusted
5 Needle bent or blunt