Abstract: A linear actuator, and a tufting machine including the linear actuator are provided. The linear actuator includes a casing, a magnet unit, and a coil unit. The magnet unit includes a magnet and a magnet mounting plate. The magnet is configured to sandwich side surfaces of the magnet mounting plate. The coil unit faces the magnet. The magnet unit is configured to reciprocate along an axial direction in the casing, between the coil unit, based on magnetization and demagnetization of the coil unit.

Abstract: A linear actuator that is driven with high accuracy and high speed and that does not take time and effort in maintenance, and a tufting machine using the linear actuator are provided. The linear actuator includes: a casing being tubular; a magnet unit configured to sandwich both side surfaces at least facing each other of a magnet mounting plate with a magnet, the magnet unit supported to be configured to reciprocate along an axial direction in the casing; and a coil unit arranged to face the magnet of the magnet unit. Based on magnetization and demagnetization of the coil unit, the magnet unit reciprocates between the coil units.

Abstract: A yarn feeder for a tufting machine is compact and simple in structure and is still capable of freely changing the heights of piles formed by each pile yarn on a fabric. The yarn feeder includes yarn feed rolls for feeding pile yarns to a row of needles of the tufting machine, and a brake device provided between the feed rolls and the needles. The brake device includes a grooved plate having grooves arranged in the width direction of the grooved plate and each receiving one of the pile yarns that are being fed from the feed rolls to the needles, and presser members each opposing one of the grooves. The presser members are movable toward and away from the respective grooves independently of one another. By pressing selected one or ones of the presser members against the bottoms of the corresponding grooves with yarns sandwiched therebetween, the feed rates of the yarns can be freely changed independently of one another without unduly increasing the size of the yarn feeder or complicating its structure.

Abstract: A yarn feeder for a tufting machine which is compact and simple in structure and is still capable of freely changing the heights of piles formed by each pile yarn on a fabric. The yarn feeder includes yarn feed rolls for feeding pile yarns to a row of needles of the tufting machine, and a brake device provided between the feed rolls and the needles. The brake device includes a grooved plate having grooves arranged in the width direction of the grooved plate and each receiving one of the pile yarns that are being fed from the feed rolls to the needles, and presser members each opposing one of the grooves. The presser members are movable toward and away from the respective grooves independently of one another. By pressing selected one or ones of the presser members against the bottoms of the corresponding grooves with yarns sandwiched therebetween, the feed rates of the yarns can be freely changed independently of one another without unduly increasing the size of the yarn feeder or complicating its structure.

Abstract: A coaxial microstrip line transducer, in which an inner conductor has a center conductor portion arranged in a recess portion of a resin case and a terminal portion is integral with the center conductor portion and so formed as to lead to a lower surface of the resin case, and an outer conductor having a first conductor portion arranged along at least a part of an inner peripheral surface of the recess portion and a second conductor portion which is integral with the first conductor portion and extends to the lower surface via an upper surface and a pair of side surfaces opposed to each other of the resin case. The inner and outer conductors are fixed to the resin case.