Weft Sensor Dealers in Nagpur

The Weft sensor is a highly sophisticated and reliable device to sense the weft breakages, empty bobbin, and uneven weft tension of shuttle in Circular Loom. The design of sensor is heavy - duty type and suitable for environmental conditions of Plastic Woven Sacks Industry. The sensor works on principle of magnetism, thereby eliminating the malfunction due to dust, ambient light, reflection of fabric, which are prominent in light based sensors. The sensor is totally sealed and hence virtually no maintenance is required in day-to-day operations, if setting is not disturbed. The installation is very simple and requires fitting of boom reflector assemblies (with magnets fitted in place of diamond) on boom pipe, mounting of sensor on the loom and fitting of relay card in panel. The magnets are arranged in such a way that north and south poles of the magnets come under sensor alternately, avoiding magnetization of sensor. The 3 - core wire from sensor connects to Relay PCB. When shuttle bobbin runs out of the tape or if the shuttle tape breaks, then the magnet rotates and comes under weft sensor. This magnetic field is sensed by sensor, and Relay is energized. The contact of the Relay is wired to stop the loom and missing tape is compensated by cramming the fabric. Cramming device avoids gap due to missing tape.

The circular Loom used in woven sack industry has 4–8 shuttle bobbins which provides the weft tapes to circular fabric. If this tape breaks, the fabric is wasted as it contains lots of missing tapes. Our Weft Break sensor has been used widely to detect these types of breaks and avoiding the wastage of fabric.However there has been great demand for detection of near empty condition of shuttle bobbin, so that bobbin can be changed before it is completely empty. This results in zero defect fabric. Usually to achieve this all the shuttle bobbins are replaced at once, even if they are not empty. This results in lot of tape wastage on 'Not so empty bobbins'. Our bobbin sensor is designed to detect the near empty condition of bobbin. When the sensor detects the near empty condition of bobbin, the sensor stops the loom, so that only that particular bobbin can be changed. This not only results in Zero defects Fabric, but also Zero wastage on bobbins also. The bobbin sensor is a highly sophisticated and state of the art sensor to detect when shuttle bobbin nears empty condition. The sensor is based on Infra Red to detect the presence of tape on bobbin, and a powerful, fast microprocessor which calculates various timing and detects the near empty bobbin and sends the trip signal to relay PCB. The relay PCB stops the loom by opening the NC contact which is in series with Loom Stop button. As the sensing mechanism is based on infra red principal, color of shuttle bobbin tape and base color of empty bobbin may affect the performance of sensor, however sensor will work faithfully on Light color tape and all mild steel bobbins. The installation of bobbin sensor is straight forward. The distance between sensor and shuttle bobbin(with about 1 mm of tape on it) should be around 140-160. The LED on the top of of sensor provides useful information. The functions are as under.