A magnetic tape guide drum for a magnetic video recording and playback apparatus has a rotary magnetic head and is adapted for guiding a magnetic tape traveling spirally about the drum. The drum includes a rotary drum portion, a stationary drum portion and a shaft secured to the rotary drum portion and supported rotatably by the stationary drum portion for rotating the rotary drum portion. A grounding device is provided in the stationary drum portion and held in sliding contact with the peripheral surface of the shaft.
An apparatus for recording and/or reproducing information on or from a tape has a fixed drum, a rotary drum, a bearing and a grounding member. The rotary drum is provided with at least one head. The bearing is disposed between the fixed drum and the rotary drum to enable the fixed drum to rotatably support the rotary drum. The fixed drum has a through hole formed within an area which corresponds to an area where the bearing is disposed. The grounding member is arranged in the through hole to be in contact with the bearing.
A head drum ground system for use with a VCR comprises an electrical coupler which is located and arranged in an inner space of the head drum assembly so that a rotary drum is electrically connected with a stationary drum within the VCR. As a result, static electricity occurring on the surface of the rotary drum is transmitted to a deck supporting the stationary drum, through a boss member, the electrical coupler, an outer ring of a bearing, and the stationary drum, in that order.
A rotary head device having a rotary drum and a rotating motor within the rotary drum, with the stator of the motor being supported by a fixed arm attached to a fixed drum or to a fixed drum supporting member. The construction permits the manufacture of the rotary head device using the manufacturing equipment used for conventional rotary shaft type rotary head devices despite the rotary head device being a thin device. In this rotary head device the position of contact of a ground brush and a rotor can be set at the center of rotation or thereabouts, so despite it being a thin device, the sliding speed of the ground brush is low, and hence it is possible to prevent the abrasion of the ground brush and also to prevent increase of the rotative driving torque.
The present invention is related to a discharging device for a head drum, and more particularly to a discharging device, wherein the static electricity which occurred from the head drum is effectively discharged using the discharge device. A fixed end of a bracket is fixed on a main chassis by a screw, and a free end forms a bracket protrusion. A coil spring is put on the free end of the bracket. A first end of a leaf spring is put inside the coil spring together with the free end of the bracket, and the first end forms a leaf spring protrusion. A tip is installed between a second end of the leaf spring and the head drum. Static electricity transmitted to the tip is transmitted to the bracket via the leaf spring. Then, static electricity is discharged through the main chassis. Thus, this discharging device can improve productivity since extra riveting or bonding is unnecessary. Also, the grounding property of the head drum is improved because the close adhesion between the tip and the revolving shaft is ensured by the coil spring.
A head drum ground system for use with a VCR comprises a PCB having a grounding terminal; and an electrical coupler electrically connected to the grounding terminal of the PCB at its opposite ends and resiliently contacted with a lower portion of a rotating shaft of a head drum. In accordance with the present invention, the electrical coupler is utilized so that static electricity generated from a rotating drum be transmitted to the grounding terminal of the PCB board through a rotating shaft.