Patent TW-507034-B (TW)
Title: A loom having magnetic levitation type shuttle
Inventor: LIOU YUNG-HE
IPC: D03D49/24
Filed: 2001-04-25
Granted: 2002-10-21
Abstract: The present invention relates to a loom having magnetic levitation type shuttle, especially a magnetic levitation type shuttle design of no noise, low power consumption, and high efficiency, which the shuttle crocheting weft in the loom moves rapidly reciprocating levitatedly along a certain track of magnetic field by the action of magnetic force. A track comprising a set of plate (frame) body pivotally connected together at two lower rims, is disposed at the outer rim of both sides of the warp end before warp is woven into fabric. A long groove is provided at the lower end of the track for the fabric to pass through. Two rows of parallel magnet array having plural permanent magnets are disposed on the opposite inner surfaces of the two plate (frame) body of the track, respectively. A strip shape electromagnet is installed passing through both ends of the set of plate (frame), respectively, between two magnetic arrays, and the set of plate (frame) body form an approaching V-shaped included angle with respective to the warp. Two rows of magnet arrays having plural permanent magnets are also provided oppositely at the location on both sides of the shuttle having the V-shaped side at the bottom and opposing to the two magnetic arrays disposed on the two plate (frame) body. The magnet arrays on the inner surface of the two plate (frame) body and both sides of the shuttle are arranged to appear same polarity, so that by the magnetic repulsion generated between the permanent magnets, the shuttle can be in the elevated state in the V-shaped track. A strip shape permanent magnet corresponding to the strip shape electromagnet on two plate (frame) body is disposed between the two magnet arrays on both sides of the shuttle, respectively. When current passes through the strip shape electromagnet between two plate (frame) body to make the magnet have the same polarity as the strip shape permanent magnet on both sides of the shuttle to generate the magnetic repulsion force, the shuttle proceed elevated and frictionless motion along the track subject to the magnetic repulsion force, and further is moved reciprocatingly in the track due to the magnetic repulsion force, and the speed of shuttle can be varied depending on the requirement in the practical situation and the specification of the strip shape electromagnet. A stopping device is disposed on each end of the track, respectively, and also has a V-shaped track. At least one set of corresponding electromagnet is disposed on each inner side of the V-shaped track, and when the shuttle enters into the stopping device from the track, the plural set of electromagnets in the V-shaped track of the stopping device are electrified to make each set of electromagnet generate magnetic attraction force, so as to achieve the purpose of decelerating and stopping the shuttle. The activation of each member of the present invention such as the strop shape electromagnet on the track is timely and suitably controlled totally by the computer. In addition, a linkage is pivotally connected between the top of both sides of the set of plate (frame) body and steel reed. When the shuttle completes each movement of crocheting the weft to one side of the loom, the mechanism disposed on the loom will drive the steel reed to slide along the direction of weft passing through to tighten the weft, and makes the two plate (frame) body of the track swing to open. When the steel reed moves back to its original position, two plate (frame) body returns to have the original V-shaped included angle enabling the shuttle to continue its reciprocation. Furthermore, for the shuttle to have an effective stability while reciprocating in the track in high speed, a swinging piece which can automatically adjust the swinging direction along with the thrust of airflow, is disposed on each side of the shuttle top. When the shuttle is moved toward different directions while reciprocating, the two swinging pieces appear to be specific different swinging angles, respectively. When the shuttle moves toward the left side, the swinging piece on the left side will tilt to have a specific angle, and the right swinging piece will stand to a specific angle. Utilizing the specific action of the airflow generated between two swinging pieces during the movement of the shuttle is a invention which is a highly creative work of technology using natural rule, and can be applied to the industry.