Abstract: An apparatus for controlling a tilt angle of a tub in a convertible washing machine which converts between drum type washing and pulsator type washing. The convertible washing machine includes a tub shaft which rotates the tub, and a tilt angle motor for changing a tilt angle of the tub to effect conversion of the convertible washing machine between drum type washing and pulsator type washing. The apparatus includes a structure which rotates with the tub and includes at least first and second projections. At least first and second reference structures are fixed to the convertible washing machine such that the first and second reference structures are stationary when the tub rotates. The first reference structure detects when one of the first and second projections is at a first predetermined position, and the second reference structure detects when one of the first and second projections is at a second predetermined position.

Abstract: This invention provides a combined washing machine in which pulsator type and drum type washing machine features are united such that they can be selectively utilized depending upon a desired washing condition, thereby executing optimal washing operation. The combined washing machine comprises a washing drum having both of a plurality of lifters, as in a drum type machine, and a pulsator, as in a pulsator type machine, and being rotatable through 90.degree. between vertical and horizontal positions by means of a driving device.