| 摘要 |
<p>According to a first aspect the present invention is related to a head drum arrangement allowing a much easier gap adjustment of the rotary transformer. The head drum arrangement comprises a non-rotating lower drum and a rotating upper drum, which are connected by a shaft fixed in the lower drum. The upper drum is mounted on the shaft by a bearing and preferably by two ball bearings. A rotary transformer is arranged between the lower drum and the upper drum having a fixed stator and a rotor rotating jointly with the upper drum. The stator and the rotor are separated by an air gap. Finally, a compressible, elastic spring is arranged between the lower drum and the upper drum, such that the length of the spring defines the air gap between the stator and the rotor of the rotary transformer. Advantageously, the invention allows defining the air gap of the rotary transformer without requiring additional members like washers, spacers or something similar. The invention is also related to a magnetic tape recorder equipped with a head drum according to the first aspect of the invention. Another aspect of the invention is related to an assembly method of a head drum arrangement according to a first aspect of the invention. <IMAGE></p> |
