Sensor on Overlock
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Transcript of Sensor on Overlock
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Development of aSensor For Threadreakage DetectionOn Overlock SewingMachine
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Introduction
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Why this project?
Something Different .Not relatedto garments directly.
Yet no sensor development foroverlock machine.
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Overlock machine: 3 thread, 4 thread
and 5 thread. Uses of overlock machine.
It is difficult in identifying thread
breakage. Operator cannot sense the immediate
breakage of the thread.
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Fabric gets affected.
Thread gets wasted.
In this project, a sensor have beendeveloped to stop the machineimmediately as the thread breaks.
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Objective of our project :
To sense the thread breakage. Developing mechanical and electronic
circuit to detect the breakage.
To stop the overlock machineimmediately after the thread breakage.
To save the time in identification of
thread breakage. To improve the quality of sewing.
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Literature
Review
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There is no sensor yet developed inoverlock machine.
Study of various sensors.
1. Rotary sensor
2. LED sensor3. Photo electronic sensor
4. Inductive displacement sensor
5. Piezo electric sensor6. Weft stop motion
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7. Capacitive sensor8. Proximity sensor
Selection of appropriate sensor.
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PLAN
OF
WORK
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Assembling of kit and sensor
Selection of sensor
Working of sensor
Study of various types of sensor
Study of over lock machine
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Conclusion
Comparison of the time with & without sensor
Testing & Readings
Implementation of senor on machine
Making of external stand
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Developmentof
Sensor
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Preparation of kit.
Components of kit: IC LM324, IC-
CD4093, Relay unit DPDT, Capacitor,Buzzer, transistor and LED.
Assembling of kit in appropriate manner.
Preparation of stand to fix the sensor. Set the passage of the thread via the
stand and through the wheel.
The wheel has metal part fixed at edgesof the axis.
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Attachment of stand on over lock machine
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Proximity Inductive Sensor
The proximity inductive sensor is anelectronic sensor which detects any
metal object which is nearer to the areaof circumference of the sensor.
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Working
of
Sensor
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Principle:
A coil and oscillator createsan electromagnetic field in the closesurroundings of the sensing surface.
The presence of a metallic object in theoperating area causes a dampening ofthe oscillation amplitude. The rise orfall of such oscillation is identified bythreshold circuit that changes theoutput of the sensor.
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Working of Proximity Sensor
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Machine on switch on
Thread breaks Thread doesnt break
Pulley stops rotating
Metal partsstops
Plastic partsstops
Continuous
high pulse
Continuous low
pulse generates
Pulley rotates
Alternatives high-low pulse
No alarm
OUTPUT
LED
BUZZER
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Output of the Sensor:
There will be pulse generation as anoutput of the sensor.
A.Alternate Low-High Pulse:
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B. Continuous High Pulse:
C. Continuous Low Pulse:
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Video of workingof sensor
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Result&
Discussion
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1.Quantitative:
1. Test on Time required for detection:
Obs. No. Without Sensor(time in milliseconds)
With Sensor(time in milliseconds)
1 35.5 2
2 39.6 2
3 46.8 2
4 55.8 2
5 26.5 2
6 27.4 2
7 33.3 2
8 41.8 2
9 28.8 2
10 37.8 2
Average 37.33 2
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2.Qualitative:a. Needle penetration mark
Without sensor With sensor
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Conclusion
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Use of sensor:
1. Saves time
2. Reduces thread waste
3. Improve the quality of fabrics4. Increases productivity
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Future Scope
Use of other sensors:
relay, led, capacitive, etc
Automatic stop mechanism Use of different types of indicators
Automatic start mechanism
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COST SHEETPARTICULARS QUANTITY PRICE
PROXY SENSOR WITH CABLE 1 800
POWER SUPPLY & RELAY CARD 1 1200
COMPARATOR CARD WITH ASSEMBLY 1 1500
RED 230 INDICATOR 1 130
BOX ASSEMBLY & WIRING 1 350
ADJUSTABLE NOBS(PRESET) 2 250
STAND EXPANSES 130
SET UP EXPENSES 100
TOTAL 4460
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THANK YOU