Patent ID: 7054112

Claim:
A head drum assembly of a tape recorder, comprising: a shaft; a rotary drum which supports a magnetic head for recording and reproducing information by scanning a running magnetic tape, the rotary drum having an axial bore with an upper recess and lower recess; a fixed drum, press-fined onto a lower part of the shaft, engaged on the axial bore of the rotary drum, parallel to the rotary drum; an upper bearing having an inner race and an outer race, the outer race being press-fit into the upper recess of the axial bore of the rotary drum, the inner race being press-fit around the shaft; a lower bearing having an inner race and an outer race, the outer race being press-fit into the lower recess of the axial bore of the rotary drum, the inner race being press-fit around the shaft; and an elastic body mounted on the circumferential surface of the shaft between the inner races of the upper and lower bearings, the elastic body directly contacting the inner races to generate a preload force at a predetermined angle with respect to the shaft.