Yarn tension regulator - has bow spring tension and sensor to indicate loss of yarn, not affected by dust and lint

摘要

A yarn tension regulator includes means for identifying the presence of yarn to indicate a broken or misdirected thread. Contained within a housing is a bow shaped flat spring pressing against a swivel lever with a forked end, to support the yarn. A casing (6) has two sides with cross rivets (33) and supported on a cross rail (16) to which it is attached by the screw (12). A flat plastic spring (20) is bowed between 90 and 180 deg., with one end held in the notch on the swivel (24) the other end in the adjuster (21). A gap (10) beneath the case allows a screwdriver to regulate the position of the adjuster (21) and spring. The adjuster swivels on the pin (22) held in the side plates. Similarly swivelling on the pin (25) the head (24) of the arm (3) contains a small permanent magnet, which aligns with a Hall probe (4). If the spring forces the arm (3) in direction (x) this maybe that the yarn (2) which passes under the guide pins (13,14), has failed to enter the fork (15) at the end of the arm (3), or is broken. The magnet leaves the location of the probe, which is suitably connected to an electronic alarm system. The arm (3) is able to rise, as there is a gap (9) in the front of the casing. ADVANTAGE - The tension is not affected by fly dust and lint, is eaily cleaned, and can quickly be adjusted.