Field of Invention
The present invention relates to the field of power loom, particularly, the present invention relates to a method and device for stop power loom motion and tripping the warp and weft operation using a reed switch, especially, with optical sensor.
Background of Invention
During weaving operation, the warp thread in power looms often gets twisted or breaks that leads to impairment in fabric. Nowadays, the mechanical methods are in use to stop warp thread motion during fault operation in power loom. The most common method to stop warp operation in a power loom is by the means of mechanical bar arrangement. This is a time consuming and tedious operation with less accuracy for warp stop motion of loom.
Several methods and devices are proposed for stopping a weaving loom in response to failure in a weft stop motion. According to one of the conventional methods and devices, a failure in a weft stop motion is detected by checking the current flow, whether or not a weft yarn contacting the two electrodes. One such method and a device for controlling a weaving loom have been disclosed in US Patent No 4082119 A. The device for monitoring the weft thread travel on an air jet weaving machine has been described in US patent US 4415008 A, every arrangements need an separate reed switches in their proper operations and does not have an adequate of picks counting. *
However, a defect can be pointed out in the above described conventional methods and devices. As, in the case of weft stop motion, the threads get racked in peril and get placed in shuttle for weft operation in power loom. If threads in peril gets empty, the operation of weft continuous in the process which leads to damage in fabric. Hence, the weft motion in peril empty conditions needs to be stopped promptly for the effective weaving operation.
To overcome these disadvantages in weft and warp stop motion of power loom, a new device has been developed by applying the digital optic method, .to enhance the fabric quality in a single device. In addition to this a reed switch is fixed with weft to counts its picks values and displays in a seven segment display.

Objective of the Invention
®" To reduce time of warp and weft stop motion
© To increase the fabric quality and production
© To enhance the accuracy of weft and warp stop motion
© To design user friendly device and give information of picks count values of weft
Importance of Invention for the Power loom sector
The handloom sector provides direct and indirect employment to over 60 lakh weavers, which is the largest economic activity in India, second only to agriculture. Despite the dominating presence of the ferried power loom sector, the traditional power loom sector has barely been able to withstand the competition. Power loom weaving has also proved to be indispensable large number of weavers around the country. Due to the effort made by the government of India through financial assistance and implementation of various developmental schemes, the production of power loom fabrics has been increased. It is important to continue with the quality of fabric developed through the power loom.
Conventional Method of Digital count Trip Motion
Conventionally, the warp and weft stop motion are available in separate device for individual operation with mechanical arrangements. When each thread twists in warp, an error is generated between the two iron needles, thus error signal from the mechanical sensor senses the two misalignments in needles to stop warp operation. In similar to the warp arrangements mechanical sensors are placed in weft to trip the motion depending on the threads in peril sensors. The pick counter with analog models and a separate reed switch are required for counts picks, which are independently connected with warp and weft stop motion.
Brief description of Drawings
Figure 1 shows functional overview of device Figure 2 shows warp sensor arrangement in power loom Figure 3 shows warp weft sensor arrangements in power loom Figure 4 shows magnetic reed switch arrangements in power loom Figure 5 shows Pick Count displays in power loom

Detailed description of the Invention
A block diagram of the working principle of Digital optic warp, weft stop motion and picks counter is shown in figure. 1, A sensor with transmitter (1) and receiver (2) is placed in warp to receive warp sensor information. Here, a reflecting type of optic sensor with transmitter and a receiver signal is used. The warp sensor is fitted on the front of the reed in such a way that it will not disturb the reed movement. The warp sensor has a set of optical components enabling the detection of the warp across the entire air channel.
. The optic type wrap transmitter and receiver sensor are perfectly aligned, so that the sensing value of sensor is zero.
A high sensitive reed switch (5) placed in between an aluminum plate senses the picks count of weft motion as shown in seven segment display (13) and gives information to the operator of .power loom. A toggle switch acts as a reset switch to reset pick count once the desired value of counts is achieved.
The optical weft sensor is placed between the shuttle movements which consist of two ends, one as a transmitter end (3) and another one as a receiver end (4). The weft transmitter and receiver are fixed to the loom frame, the flexible optical lights are disposed on the reed frame to receive the shuttle thread information. A step down transformer (6) is used to convert 230V AC (alternate current) to 12V AC. Further, 12V AC is converted to 12V DC by using diode rectifier for energizing the electronic circuits.
. The power supply board supplies 5 V DC to Programmable Interface controllers (PIC) type microcontroller (7). The PIC microcontroller is a general purpose device, which integrates a number of the components of a microprocessor in single chip. The PIC microcontroller (7) used here has 28 pins with 20 MHz oscillators with wide operating range of 24 inputs and 11 bit Analog to Digital Converter (ADC). The optic weft and warp sensor are connected with the PIC controller and they monitor and receive optic sensor signals to measure threads in peril of shuttle and the thread arrangement in the warp. The magnetic based reed switch placed at the end of warp, converts the two pulses into the single pick count. The outputs of PIC micro controller is shown with three Light Emitting Diode(LED) indicators (8, 9, and 10), first is for power indication, second LED is for warp trip and third is for weft trip. A buzzer (11) is also connected to alert the operator for warp and weft trip fault. The solenoid relay (12) also acts as

a brake, which is connected to stop the motion of loom once the warp and weft fault occurs. This device is used to stop the weft and warp motion.
Construction
The warp and weft stop motions including the pick counter which are designed with PIC micro controller (PIC16F886) for individual picks count, which denotes a single weft motion. The arrangements have to be done in weft and warp using digital optic sensor to transmit and receive the light signals. The weft sensors are placed, in the loom above the shuttle arrangements for weft sensing. The warp sensors are placed in between the thread arrangements in loom which are aligned by the position needles. A weft movement spindle is connected with an aluminum plate and attached with magnetic reed switch to receive the pick counts.
Description of the parts of the device
Warp arrangement
The warp (3) arrangement is made with optic transmitter (1) and receiver (2) as shown in figure.2. It is placed such a way to receive the light signals (4) passed through the threads. If any disturbance or twist occurs in the threads, the intensity of the light falling on the receiver J is lowered which results in the braking operation of power loom and it is indicated through a LED in panel and stops looms by relay to activate the brake with buzzer sound.
Weft arrangement
The weft arrangement is made with laser transmitter (2) and the receiver (1) arrangement as shown in figure.3. It is placed to send the light information to the receiver through the shuttle (3) and peril (4) from transmitter. Once all the entire threads are complete, the light signals occur twice on the receiver for which the controller stops the whole loom operation through solenoid relay by activating the brake and also type of fault is indicated through a LED.
Magnetic reed switch
The picks count of shuttle is measured by a magnetic reed switch (1) indicated in a seven segment display, which are arranged as shown in figure.4. An aluminium plate (2) and a shaft (3) are used for integrating the features of pick counts with the two number of pulse count as one number of the pick. The picks are counted by a magnetic reed switch (2) and displayed in a seven segment display (1) as shown in figure.5.

Controller Board
The function of PIC micro controller function is to monitor warp and weft sensor and to perform warp and weft stop motion. During warp and weft stop motion, a buzzer alarms the operator and LED displays the type of fault. In addition to this, PIC microcontroller acquires pulses from the magnetic reed switch and displays count values in 2:1 ratio.
Working of Invention
During the weaving process, if the thrfcads of the weft peril are completed, the laser beam falling on the receiver is doubled. On such event the weft stop motion is activated and the machine is stopped by the solenoid relay. The operator will be given an alert by a buzzer and the type of failure is indicated in three LEDs (red-power, green-warp fault and bine -weft fault). Later, if the operator replaces by a loaded peri! in the shuttle, the weft fault indicated' gets cleared automatically;
The proposed weft trip operation is fully digitalized which measures the light passing through the peril as threads is fully poured out the loom will stop from its motion. The magnetic reeds switch and aluminium plate is attached with the shaft of the machine for measuring the picks counts, which are displayed in the four digit seven segment display. When the aluminium plate is inside the reed switch, the warp stop motion is enabled. When the twisting of threads or break up of threads occur the intensity of the laser beam received by the warp receiver reduces and induces the electrical circuit to stop the loom. Once the faults are eliminated in warp side, the power ioorn machine resumes its normal operation.

.Claims
We Claim(s):
1. The attachment designed comprising;
a) a reed switch with the operations of digital optic warp, weft stop motion and weft count in a PIC-microcontroller
b) a buzzer used to alert the operator about warp and weft failures
c) a relay which trip the handbrake to the stop loom motion
d) a LED indicator panel indicates the type of fault
e) a seven segment display shows the number of pick counts of weft shaft using the position disc and display the intensity of light received from the warp and weft receiver sensors.

2. As claimed in claim 1, wherein weft trip sensor gauge of light intensity operates in digital form to trip relay and to stop the loom motion.
3. As claimed in claim 1, wherein the reed switch, in closed position with condition of
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shuttle, either on left or right corner of warp post reed, to measure the failure and to trip warp stop motion.