Graf CPF User manual

INSTRUCTION MANUAL
Friction Measuring
System CPF / CTC
Graf Chemicals GmbH Phone: [phone]
Prof.-Max-Lange-Platz 4 [e-mail]
83646 Bad Tölz –Germany www.graf-chemicals.com

Instruction Manual FRICTION MEASURING SYSTEM CPT/CTC / Version 2.0 –06.2020 2
CONTENTS
1. Introduction……..……………………………………………………………
…..3
2. Function and structure of the CPF………………………………………….
…..5
3. The thread-pull off-device.…………………………………………………...
…..6
4. Other components of the measuring system……………………………….
…..8
5. Explanation of the tension measuring head.……………………………….
6. Two pictures of the structure of the motor..………………………………..
…..9
….10
7. Installation Guide for Graf Friction Lab 2.9…………..…………………….
8. Start Graf Friction Lab 2.9…..……………………………………………….
….11
….15
9. Calibration of the program……………………………………………………
10. Operating of the program…..................................................................
….16
….20
11. Typical diagrams…................................................................................
12. Technical data of the CPF…………………………………………………..
….21
….23
13. Declaration of conformity…………………………………………………..
….24

1. Introduction
Friction measuring device CPF / CTC
Measuring Software Graf Friction Lab 2.9
The friction of a sewing thread or embroidery yarn has a decisive
influence on the machinability and productivity.
The more uniform the friction of the yarn, also from one batch to another,
the more constant the yarn can be processed. A regular low friction avoids
hooking and picking of the yarn in the thread guiding devices.
The speciality of the graf fricton measuring device CPF / CTC is the measuring of sewing
thread and embroidery yarn. Our philosophy in this item is to imitate the tension
device systems of a sewing machine, but to have reproducible conditions, of course,
under same climatic conditions. Because of this we use a standard sewing thread tension
device (see picture 1) for our CPF friction device. Our CPF-CTC friction device is equipped
with a yarn roller tension break (see picture 2).
As a sewing machine makes no constant pull speed, we can measure at different speeds.
We can measure, for example, friction at 5m/min and the characteristics of pulling the yarn
from a standing position with 5cm/min. It is called “stick-slip”.
A yarn with a bad stick-slip really stops in the tension device and then, when tension is
high enough it slips through. Then friction diagram looks like a saw-tooth.
picture 1: Tension device
Instruction Manual FRICTION MEASURING SYSTEM CPT/CTC / Version 2.0 –06.2020 3
picture 2: Yarn roller tension break

picture 3: Fournisseur
Our friction devices are equipped with a fournisseur (yarn feeder) (see picture 3)
to have a constant, nearly free tension at the beginning of the tension device. So only
the friction of the yarn and not the quality of the winding is measured. This is also one
further point to get more reproducible results.
With this nearly zero tension we avoid using a second tension measuring head.
Instruction Manual FRICTION MEASURING SYSTEM CPT/CTC / Version 2.0 –06.2020 4
To get same results, with one yarn at different locations, besides same climate, the same
settings of the tension device system are necessary. For this, we produce calibration yarn.
This specially cleaned and rinsed calibration yarn, which is from one dye lot and lubricated
with our lubricant Silwa 145 KS at our SL2 lubrication system, gives a very
constant friction, also at different humidity. A consistent level of quality of the calibration yarn
is very important, especially if the friction devices are used at different locations.
It is important to set standards for production control.
The friction measuring file can be send easily by E-mail.

2. Function and structure of the Measuring device
Computer
Reel Tension
measuring
head
Fournisseur
Cone
Thread course
Tension
device
Driving barrel
A/D-converter
1. The thread will pulled off from the cone by the fournisseur. Turning the driving conus
(half moon) of the fournisseur the thread stock can be adjusted. After that the thread
on the fournisseur can be pulled off with nearly no tension.
2. A driving barrel, where the thread is turned around several times, move the yarn.
The barrel is driven through a DC-motor, whose rotation speed can be regulated
independent from the load. Because of this the thread can be pulled off with a
constant, prescribed speed.
3. After the fournisseur the thread goes through the tension device. The friction, which
arises on the thread going through the tension device, results in the necessary
tensile force, which pulls the thread with prescribed speed through the yarn brake.
4. This tensile force of the thread is measured in the tension measuring head.
The tension measuring head (consist of the DMS1-strength-sensor) converts the tensile
force in electric voltage, which is directly proportional to the tensile force.
5. The voltage signals from the tension measuring head goes to the A/D-converter, which
converts the signals in discreet digital values, which are received and processed from
the computer.
6. The thread, which is coming from the driving barrel, is up winded on the reel.
1DMS =”Strain gauge“
Picture 3: Schematic structure
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3. The Thread-pull off-device
To make the measuring set-up as flexible as possible, the speed control, the driving
barrel and the reel are installed in a separate case, the pull off-device (See Picture 4).
BDA
C
Picture 4: Pull off-device
A
Speed controlled aluminium barrels for driving the thread
To transmit a maximum of driving effect to the thread, the thread is wound
around the barrels for several times.
B
Reel for winding up the measured thread
The reel is torque-controlled, thus it can wind up fine thread as well as
coarse thread without any influence on the measurement.
C
Rotary potentiometer for adjusting the pull off-speed (barrel speed)
To guarantee an exact and long time constant adjustment, it was used a
spiral potentiometer.
D
LED-digital display for the pull off-speed
The actual pull off-speed is described at this display. A field adaptation of
speed from 0,5 to 50 cm/min and from 0,5 to 50 m/min is also possible.
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12
4567
8
3
1
Overload
Overload protection for the motor
Delete this protection: switch off the drive (button no. 5)
and press the red button of the overload protection
2
Drive
Status
Acceleration ramp
red light: the drive stands still or accelerates
green light: the drive works with constant speed
3
Wind
Reel-switch
It switches on and off the reel
4
Torque
Reel-torque
The power of the reel can be set from 0 % to 100 %
5
Drive
Drive switch:
On - drive works continuous
Off - drive is switched off
6
Feed
Fixed feed-speed setting:
On - feed speed setting with 25 m/min
Off - feed speed setting off
7
Store
Switch for the extern fournisseur
8
Speed
Range
Change the speed from m/min to cm/min (stick-slip)
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4. Other components of the measuring system
The other components like the serving bobbin coil holder, the fournisseur, the yarn
brake and the tension measuring head are installed at a separate board.
E
A
D
C
A
Bobbin holder
B
The fournisseur for tension-free thread-serve
The fournisseur takes off a specific quantity of thread from the bobbin.
This thread can nearly tensionfree unreeled. If the stock is exhausted, the
fournisseur turns on itself for coiling and providing new thread.
C
The yarn brake
The yarn brake, where the thread goes through, produces the real
frictional force for measuring.
D
The tension measuring head
The tension measuring head measures the tension of the thread, which is
produced by the yarn brake. The A/D-converter changes the tension
signals in digital values for the computer.
E
Board
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B

5. The tension measuring head
It contain inside an aluminium plate with two bonded DMS-strain gauges. At this
plate a yarn roll is mounted for measuring the thread. The yarn tension
leads to a bend of the aluminium plate. This bend can be measured through the strain
gauges (see Picture 5).
Moving
roll
Firm rolls Alu-case
Connecting
cable
Analysis electronic
Aluminium plate
The thread is first guided
upwards through the firm
roll, then it goes around the
moving roll, which is connected to
the aluminium plate, and finally it is
guided around the second firm roll.
The tension signals, which are
produced from the tension measuring
head, are sent to the
A/D-converter-interface. The interface
changes the signals in discreet digital
values and send them to the
computer.
The interface makes equalise and zero adjustment of the tension measuring head
possible to guarantee a very high precision.
Every interface is adjusted to the tension measuring head. If the tension measuring
head is changed, the interface has to be adjusted again.
DMS-
strain gauge
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6. The Structure of the motor
Display Automatic
controller
Required
value
Start
Actual value
End stage
Interruption of
circuit
Reference
Comparator
Control unit
Start ramp
Mains
Trafo
Control
Power
unit
Motor with
speedometer
Status
indicator
Start
Required
value
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7. Installation Guide for the Graf Friction Lab 2.9 Software
General requirements:
OS Windows 7 or higher, USB 2.0 port, A/D-converter with USB cable (included in
the delivery), Graf friction measuring system CPF or CPF-CTC (included in the delivery).
The A/D-converter should be connected to the tension head of the Graf friction measuring
system and to the computer.
Graf Friction Lab 2.9 (Friction Measurement System Software) is available for
download at www.graf-chemicals.com/en/products/technological-products
Also you will get a license key (LicenseFile.asc), which allows you to install and use the
software.
7.1.
LicenseFile.asc and the
Setup_GrafLab-2.9 should be
in the same file
7.2.
Click “Setup_GrafLab-2.9“ to
start the setup
7.3.
Choose the language and
click “ok”
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7.4.
Click “Next”
7.5.
Choose “I accept the
agreement” and click “Next”
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7.6.
Select destination location
and click “Next”
7.7.
Select start menu folder and
click “Next”
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7.8. Select additional tasks
and click “Next”
7.9.
Setup is now ready to begin
installing of the GrafLab on
your computer
7.10
The program is now installed.
Click “Finish”
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8. Start Graf Friction Lab 2.9
8.1.
Click “Start“ and choose the
“Graf Lab“ to start it
Before measuring process for
the first time, proceed at first
with the chapter 9 “Calibration
of the Program”.
Then start with 8.2.
8.2.
Start a measuring with “F1” or
load an old one with “F4”.
8.3.
Start Graf Friction Lab 2.9 for
the first time: A window
appears to enter your
Company name and location
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9. Calibration of the Program
9.1.
Click in the top menu
“Preferences” , then
“Options” and choose
“Calibration”
9.2.
Prepare supplied calibration
weight (approx.1000 g)
9.3.
Check if the weight
mentioned on the label is
correct (while weighing it on
some scale)
9.4.
Write the measured
weight in the small field
“Weight (500-2000g)” and
click “Calibrate”
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9.5.
Check if the measuring
head is free of any weight
(please see the picture
below) and click
“Continue”
9.6.
The calibration needs
some seconds.
If required please repeat
the procedure.
The picture on the left
shows the measuring
head in a completely
unloaded state.
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9.7.
Charge the measuring
head with the weight and
click “Continue”
The picture on the left
shows the measuring
head loaded with the
weight referred to above.
It must be fixed on the
wheel at the top of the
measuring head.
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9.8.
Accept the calibration with
“JA”
Calibration is now valid.
9.9.
Remove the weight from
the measuring head
The Graf Friction Lab 2.9 software is now calibrated correctly.
You can check this by running a measuring test with the weight hanging on the
Measuring head as you can see in the picture of Step No. 9.7.
With a weight mass of X gram, the measurement curve in the screen must have a
constant value of X/2,04cN
Example:
With a weight mass of 1145 gram, the measurement curve in the screen must have a
constant value of 562cN +/- 5cN
Then, please run a measuring test with the measuring head completely unloaded, as
you can see in the picture of step No. 9.5.
In this case, the measuring curve on the screen must stay at 0cN (zero line).
If you have any doubt that the calibration process has been incorrect, you can perform
this process again without having to reinstall the software
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10. Operating of the program
10.1.
Click in the top menu
“Preferences”, then
“Options” and choose
“Options 1”
Make your settings.
“Maximal time” means the
time after that the
recording process stops
automatically
“Measurement per sheet”
means the number of
measurements per page
10.2.
Click “Ok” after the setting
10.3.
Click in the top menu
“Preferences”, then
“Options” and choose
“Options 2” to make other
settings
10.4.
Click “Ok” to confirm your
settings.
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