Sensor on Overlock

8/13/2019 Sensor on Overlock

1/32

Development of aSensor For Threadreakage DetectionOn Overlock SewingMachine


2/32

Introduction


3/32

Why this project?

Something Different .Not relatedto garments directly.

Yet no sensor development foroverlock machine.


4/32

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.


5/32

Fabric gets affected.

Thread gets wasted.

In this project, a sensor have beendeveloped to stop the machineimmediately as the thread breaks.


6/32

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.


7/32

Literature

Review


8/32

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


9/32

7. Capacitive sensor8. Proximity sensor

Selection of appropriate sensor.


10/32

PLAN

OF

WORK


11/32

Assembling of kit and sensor

Selection of sensor

Working of sensor

Study of various types of sensor

Study of over lock machine


12/32

Conclusion

Comparison of the time with & without sensor

Testing & Readings

Implementation of senor on machine

Making of external stand


13/32

Developmentof

Sensor


14/32

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.


15/32

Attachment of stand on over lock machine


16/32

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.


17/32

Working

of

Sensor


18/32

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.


19/32

Working of Proximity Sensor


20/32

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


21/32

Output of the Sensor:

There will be pulse generation as anoutput of the sensor.

A.Alternate Low-High Pulse:


22/32

B. Continuous High Pulse:

C. Continuous Low Pulse:


23/32

Video of workingof sensor


24/32


25/32

Result&

Discussion


26/32

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


27/32

2.Qualitative:a. Needle penetration mark

Without sensor With sensor


28/32

Conclusion


29/32

Use of sensor:

1. Saves time

2. Reduces thread waste

3. Improve the quality of fabrics4. Increases productivity


30/32

Future Scope

Use of other sensors:

relay, led, capacitive, etc

Automatic stop mechanism Use of different types of indicators

Automatic start mechanism


31/32

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


32/32

THANK YOU

Sensor on Overlock

Documents

Transcript of Sensor on Overlock