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Summary of Contents for Graf CPF
- Page 1 INSTRUCTION MANUAL Friction Measuring System CPF / CTC Graf Chemicals GmbH Phone: +49 (0) 8041 79285-16 Prof.-Max-Lange-Platz 4 frank.engelbrecht@graf-chemicals.com 83646 Bad Tölz – Germany www.graf-chemicals.com...
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Page 2: Table Of Contents
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.………………………………. …..9 6. Two pictures of the structure of the motor..……………………………….. -
Page 3: Introduction
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. - Page 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.
- Page 5 2. Function and structure of the Measuring device Fournisseur Cone Tension Tension Reel Driving barrel measuring device head Thread course Computer A/D-converter Picture 3: Schematic structure 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.
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Page 6: The Thread-Pull Off-Device
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). Picture 4: Pull off-device 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. - Page 7 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 Drive Acceleration ramp Status red light: the drive stands still or accelerates green light: the drive works with constant speed Wind Reel-switch It switches on and off the reel...
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Page 8: Other Components Of The Measuring System
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. Bobbin holder 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. - Page 9 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).
- Page 10 6. The Structure of the motor Automatic Actual value Display controller Reference Start ramp End stage Comparator Required value Interruption of circuit Start Control unit Status Power Control Mains indicator unit Trafo Motor with speedometer Start Required value Instruction Manual FRICTION MEASURING SYSTEM CPT/CTC / Version 2.0 – 06.2020...
- Page 11 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.
- Page 12 7.4. Click “Next” 7.5. Choose “I accept the agreement” and click “Next” Instruction Manual FRICTION MEASURING SYSTEM CPT/CTC / Version 2.0 – 06.2020...
- Page 13 7.6. Select destination location and click “Next” 7.7. Select start menu folder and click “Next” Instruction Manual FRICTION MEASURING SYSTEM CPT/CTC / Version 2.0 – 06.2020...
- Page 14 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” Instruction Manual FRICTION MEASURING SYSTEM CPT/CTC / Version 2.0 – 06.2020...
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Page 15: Start Graf Friction Lab 2.9
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. -
Page 16: Calibration Of The Program
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. - Page 17 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.
- Page 18 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. Instruction Manual FRICTION MEASURING SYSTEM CPT/CTC / Version 2.0 –...
- Page 19 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.
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Page 20: Operating Of The Program
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. -
Page 21: Typical Diagrams
11. Typical diagrams Average calculation of the tension in cN ( 1cN 1g ) The lower, the better F max Maximum tension peak in cN The more close to FAV, the better F min Minimum tension peak in cN The more close to FAV, the better Dimensionless number for the roughness of the friction diagram The lower, the better... - Page 22 Bad stick-slip Good stick-slip Instruction Manual FRICTION MEASURING SYSTEM CPT/CTC / Version 2.0 – 06.2020...
- Page 23 130 x 185 x 70 mm Weight A/D-converter 1,1 kg Strength measuring range 0 ... 2.000 cN Point of destruction 6.250 cN Measuring solution GRAF-ADC 12 Bit Measuring solution UM4 8 Bit Sampling frequency 2 Hz ... 100 Hz Measurement error about full scale...
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