Textile Technocrats
‘TEXTILE TECHNOCRATS’ Electronic Twist Tester has been designed specially to meet the growing demand of the textile industry for an accurate instrument to measure the twist (TPM or TPI) in the twisted yarn. ‘TEXTILE TECHNOCRATS’ Electronic Twist Tester is a motor driven semiautomatic instrument which gives digital displays of twist by un-twist method.
FRONT PANEL CONTROLS
1. START/ STOP SWITCH FOR MOTOR.
2. S/Z SWITCH FOR SELECTION OF TYPE OF TWIST OF YARN.
3. NORMAL / REVERSE SWITCH FOR SELECTION OF NORMAL UNTWIST OR REVERSE OPERATION IN WHICH TWIST IMPARTED IN OTHER DIRECTION ARE REMOVED.
4. RESET SWITCH FOR COUNTER RESET.
5. ADJ / HIGH SWITCH FOR SELECTION OF MOTOR SPEED ADJUCTABLE OR HIGH
6. ADJ KNOB FOR ADJUSTMENT ORF MOTOR SPEED IN ADJ POSITION OF SWITCH.
7. DIGIT DIGITALDISPLAY
IDENTIFICATION OF OTHER PARTS
The instrument consists of following parts, which are required to be used during operation.
1. YARN CLAMPS- There are tow Nos. of clamps fixed at the two ends of instrument. One clamp is fixed on moving crosshead and other is fixed on the motor shaft. The yarn under test is held between these two yarn clamps.
2. MEASURING SCALE- This scale is fixed on the top of left side panel of the instrument. The scale is used to ensure 250 mm or 10 inch test length of yarn between the clamps. The scale also shows the extension in the yarn during untwisting under tensioning weight.
3. YARN TENSIONING WEIGHT- The weight is provided with a hook for attachment to the moving crosshead for putting yarn under test in tension.
YARN TEST LENGTH : 250 MM/ 10 INCH
TPM : UPTO 9999 TPM (DIRECT TPM IS DISPLAYED)
TPI RANGE : UPTO 250 TPI (TPI X 40 IS DISPLAYED)
RESOLUTION : 1 COUNT FOR TPM/0.250 COUNT FOR TPI
SUPPLY : 230 V AC, 50 Hz
EQUIPMENT WEIGHT : APPROX. 2KG
ELONGARTION RANGE : APPROX 15%
MOTOR SPEED : 0 TO 1500 RPM (APPROX)
OPEREATING PROCEDURE
Clamp the yarn in the clamp fixed on the motor shaft. A guide is provided on the clamp for easy clamping. Pull the other end of yarn through the clamp on the moving crosshead had while clamping ensure that yarn is clamped for proper test length and yarn is free and under correct tension of weight. This is necessary to have uniform length of yarn between the clams under fixed tension to get proper repeatability of the results. Select S/Z switch in S or Z position depending upon type of yarn. Put the main switch ON and press the ‘RESET’ push button to ensure zero reading on the digital display unit. Select the motor speed to high speed position. Select ‘NORMAL’ position for initial operation. Start the motor using ‘START / STOP’ switch. The motor will now start untwisting the yarn and DIGITAL DISPLAY will start counting. After reaching approx. 90% of expected TPM reading, it is recommended to lower the motor speed to minimum possible to get better results. By using ‘ADJ knob’ the motor can be run in very slow to moderate slow speed, or if motor stops completely test can be run manually by pushing motor shaft by hand.
At this stage insert a pin in the untwisted yarn and start moving the pin from crosshead end to motor end and go on opening the yarn by running motor at slow speed. When is fully untwisted, stop the motor and note the reading. This reading indicates directly ‘TPM’ without using any multiplying factor. For TPI (Grip length 10 inch) counter reading is to be divided by 40.
In case test is overrun after fully untwisting the yarn and twist in opposite direction had taken place, then stop the motor. Put the machine in ‘REVERSE’ operation. ‘REVERSE’ operation changes the direction of rotation and also counting is done downward. Now start the motor till full untwisted position is obtained. The reading on digital display will automatically come down and show correct TPM. The extension of scale provided gives and idea of elongation of yarn because of un-twisting.
