Abstract: A welding gun is incorporated into a unidirectional welding system, where the unidirectional welding system includes: the welding gun performing welding when a set pressing force is applied; a power portion configured to generate power to be applied to the welding gun; a power connecting portion having one end portion connected to the power portion through a power wire and an opposite end portion engaged with the welding gun; and a power switch provided at the power connecting portion to selectively apply the power generated from the power portion to the welding gun.

Abstract: A welding gun is incorporated into a unidirectional welding system, where the unidirectional welding system includes: the welding gun performing welding when a set pressing force is applied; a power portion configured to generate power to be applied to the welding gun; a power connecting portion having one end portion connected to the power portion through a power wire and an opposite end portion engaged with the welding gun; and a power switch provided at the power connecting portion to selectively apply the power generated from the power portion to the welding gun.

Abstract: A vacuum cleaner includes a vacuum suction pipe through which impurities are collected together with air. A suction side plate has a central hole which corresponds with the vacuum suction pipe so that the vacuum suction pipe is fitted in the central hole. A holding plate is spaced apart from the suction side plate. A spring unit connects the suction side plate with the holding plate to elastically adjust a distance between the suction side plate and the holding plate.

Abstract: A vacuum cleaner includes a vacuum suction pipe through which impurities are collected together with air. A suction side plate has a central hole which corresponds with the vacuum suction pipe so that the vacuum suction pipe is fitted in the central hole. A holding plate is spaced apart from the suction side plate. A spring unit connects the suction side plate with the holding plate to elastically adjust a distance between the suction side plate and the holding plate.

Abstract: A vacuum cleaner includes a vacuum suction pipe through which impurities are collected together with air. A suction side plate has a central hole which corresponds with the vacuum suction pipe so that the vacuum suction pipe is fitted in the central hole. A holding plate is spaced apart from the suction side plate. A spring unit connects the suction side plate with the holding plate to elastically adjust a distance between the suction side plate and the holding plate.

Abstract: Disclosed are a terminally modified polyoxyalkylene glycol which may dramatically improve color uniformity and machinability, when applied to a polycarbonate resin transmittance, a polycarbonate resin composition comprising the same, and a light guide plate manufactured using the same.

Abstract: Disclosed are a terminally modified polyoxyalkylene glycol which may dramatically improve color uniformity and machinability, when applied to a polycarbonate resin transmittance, a polycarbonate resin composition comprising the same, and a light guide plate manufactured using the same.

Abstract: A cooling system for a spot welding device which cools heating parts of a spot welding device including two electrodes, a gun body, and a transformer, may include an air compressor, an air separator connected with the air compressor and separating compressed air supplied from the air compressor into hot air and cooling air, and a connection line supplying the cooling air separated by the air separator to a heating part of the spot welding device.