Thread-tension and thread-length controller

Disclosed is a thread-tension and thread-length controller, comprising sensing means for detecting thread-tension at a trailing edge by means of strain gauges, amplifying means for amplifying an output of the sensing means, thread-length measuring means for measuring a thread-length outputted in a pulse form according to phase variation by comparing output signals with one another, which were divided due to a phase difference in three phases of a motor, through a comparator and inducing magnetism through a rotation, displaying means for displaying an operated condition on a screen, actuator means for maintaining the thread-tension to a desired level by using the small size brushless motor employing an oiless metallic bearing, cutting means for cutting threads, communication means for transmitting the thread-tension variation and the work condition measured by a communication protocol to a central system and storing the data, and control means for outputting control signals to maintain the thread-tension to be constant according to the thread-tension variation. The present invention has advantages of accurately controlling the thread-tension by directly detecting the thread-tension through a thread-tension sensor, and extending a life by using the small size brushless motor employing the oiless metallic bearing as well as ensuring a remote diagnosis and control by using a two-way communication.