Data Communication in Sewing Technology

Unlike master textile, there is various energy saving opportunities that exist in every textile plant in a various way. The main purport is to save the overall unit cost for better profit margins. Overall electricity consumption and electricity expenditure is one of the main considerations during costing. We can’t share exact design for the industrial patient issue of industry. Manual switching control system installed for the sewing machine but the intermittency is that it’s depend upon the worker, moreover, it’s lagging the monitoring system.

The slave is connected with machine and station light. Whenever the worker starts the machine, slave senses the machine current and turns ON the light and optional fan for a specific period of a time. ON light status is adjusted through programming. Master slaves communicate through RS485. The entire master’s takes data from all the connected slaves and sends it to the single master, afterword single send data to receiver using a wireless transmitter. A receiver receives the data and sends it toward the managerial computer. Data gets processed at the receiver end which sends it to the computer through RS232. If the system is turned off, then data will be saved in EEPROM. The data gets transmitted, when the computer turns ON. 

Data communication for complete system is shown in Fig. 2. Master asks for data from Master 1 to Master 13, etc. among the nth numbers of slaves. After five minutes, master asks to send data to receiver, receiver replies with D it’s means receiver is ready to accept data, afterword transmitter send data to a receiver through the R.F. transmitter and receiver send to towards computer and save it and utilize whenever it needed.

The basic principle of the circuit is comparing the current of machine with supply line current by converting into voltage using lm324 voltage comparator.

When machine starts working then flux around the supply line change, this change of flux induces some amount of voltage certainly detection of current give signal to relay to operate turn ON the light [11, 12] usha 8801e bruce x5 bruce q5 singer silver girl sewing machine

Pros and cons of this current sensing mechanism

·         There is no wired issue.

·         There is no sensor which can hurdle into work.

·         There is no sensing area issue.

·         There is no cost issue.

·         Easily to install.

·         Analog components will be used, which efficiency decreases with time.

Module Design Sewing machine draw a 0.8-amp (tested value) current on working state. So, we compare the current of the machine with predefine value (0.8A). One leg of C.T connects with supply and the other one with machine supply. Machines current flow by pushing the feet on paddle, current is sensed through C.T. Some amount of voltage induces, phenomenon explains above. Our circuit working in D.C level so we rectify the current using diode and capacitor. We will do half wave rectification because using half wave rectifier voltage drop across the diode is 0.7V and if we use full wave rectifier drop across the diode will be 1.4V. If that is so, voltage drops across diode increases due to it sensing voltage can’t detect. The reason is that our current sensor is current transformer and voltage across C.T. is very low, where very low voltages produced. The measured voltage across the diode is 0.32V at 100Watt load. Polar capacitor connects parallel to diode and C.T for improving transient response. Resistor connects parallel to capacitor for improving discharging time of capacitor and its make R.C circuit. We can change the time using variable resistor. We used lm324 comparator for voltage comparison. We adjust the 0.25 voltage at inverting input pin 2 using voltage divider rules for comparison. Sensor (RC circuit) output will go to lm324 pin 3 which would be 0.45 volt. If the value of voltage below adjustable voltages the output will be zero otherwise one. When sensor output high it will trip the relay and relay will turn ON the light. But the problem is that it will be for momentary. So, we use another comparator. The output of one comparator will go to noninverting input (pin 5) through RC circuit and the diode. Resistor and capacitor connect parallel with diode and pin 5 of lm324. A resistor is used for increasing the discharging time of the capacitor and diode use for resisting back flow of current. When output of one comparator is high the capacitor will charge and the diode will resist to slow discharge or back flow of current. Second comparator output will connect to relay and relay will be higher until the capacitor discharge. We can adjust the timing using RC circuit.