Abstract: A pressure dehydration low-frequency washing machine with a simplified structure using a single motor and a driving mechanism, including an electromotive rotation shaft horizontally installed below a washing tub, a selective drive for driving an oscillating plate of the washing tub by selectively converting rotation force of the electromotive rotation shaft to a reciprocation force according to the rotation direction of the electromotive rotation shaft, an air-compressor for converting the rotation force of the electromotive rotation shaft to a reciprocation force and compressing air by means of a piston driven by the reciprocation force, a pressure-applying dehydrator for applying pressure and dehydrating the laundry in the washing tub by being expanded by compressed air from the air-compressor when the electromotive rotation shaft is rotated in a direction where the selective drive is not driven, and a controller for selectively transferring the compressed air in the air-compressor to the pressure-applying

Abstract: An automatic washing machine and a method for confirmation of a washing machine clutching operation which achieves the desired mode conversion between a washing mode and a dehydrating mode by ascending and descending its inner tub. The washing machine includes an outer tub, a perforated movable inner tub, a buoyancy generator for lifting the inner tub in accordance with a water level in the outer tub, a motor mounted on the outer bottom center of the outer tub, a rotator mounted on a top end of the motor shaft, and a clutching unit for selectively coupling the inner tub to either the outer tub or the rotator according to the position of the inner tub ascending and descending under the guide of the motor shaft. To confirm the clutching operation, a driving time or a driving stop time of the motor is counted and compared with a predetermined reference time.