JPH04268201A - Fitting mechanism for coaxial type rotary transformer - Google Patents

Abstract

PURPOSE:To improve the positioning accuracy of a rotary transformer stator(RT) to the lower drum by attaching a holder part fixed to the RT with a screw inserted from the lower end part of the lower drum, so that the RT and the lower drum can be attached and detached. CONSTITUTION:A rotary transformer rotor 10 is inserted into a fitting part of the upper drum 2, and attached to the drum 2 by holding down the lower end face of a rotor 10 with a holding metallic fixture 12 which can be fixed to the lower end part of the upper drum 2. An RT 11 is inserted into the lower drum 1 in a state that a rotary transformer stator holder 13 is coupled, and fixed by inserting a fitting screw 14 into a through-hole of the drum 1 and a screw hole part of the holder 13.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mounting mechanism for a coaxial rotary transformer used in a magnetic recording/reproducing device such as a video tape recorder for transmitting and receiving signals from a rotating drum to a fixed drum.

0002

2. Description of the Related Art A rotary magnetic head drum using a conventional coaxial rotary transformer uses a mounting mechanism as shown in FIG. In FIG. 3, 1 is a lower drum fixed to a device body such as a chassis, 2 is an upper drum coaxially rotatably mounted on the lower drum 1;
is fixed to the rotating shaft via the disk 3. Further, the rotating shaft 4 is rotatably supported by bearings 5 and 6 provided on the lower drum 1, and is rotationally driven by a bearing collar 7 and a motor section 8 provided at the lower end, and a magnetic head 9 is attached. upper drum 2
The recording information signal is transmitted and received from the tape. Here, coaxial type rotary transformers 10 and 11 are used to send and receive recorded information signals from the upper drum side to the lower drum side.The rotor 10 is inserted into the fitting part of the upper drum 2, and the upper drum The stator 11 is fixed by being inserted into a fitting portion of the lower drum 1 to which adhesive has been applied in advance.

0003

[Problem to be solved by the invention] In the conventional coaxial rotary transformer mounting mechanism, the rotary transformer stator and lower drum are attached by adhesive, which tends to cause unevenness of the adhesive used and requires highly accurate positioning. The installation of the rotary transformer causes deviations in the eccentric direction and height direction, making it difficult to obtain stable signal transmission performance, and in such cases, the installation accuracy cannot be corrected.

0004

[Means for Solving the Problems] In the coaxial type rotary transformer mounting mechanism of the present invention, the holder portion fixed to the rotary transformer stator is mounted with screws inserted from the lower end of the lower drum, and the rotary transformer stator and the lower drum are detachably attached. It is arranged so that it is possible.

[0005]

[Operation] Therefore, by attaching the rotary transformer stator with screws inserted from the lower end of the lower drum without using adhesive, the rotary transformer and lower drum can be attached and detached, and highly accurate positioning can be achieved, resulting in stable positioning. It becomes possible to obtain signal transmission performance.

[0006]

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view of the mounting mechanism of a coaxial rotary transformer stator according to an embodiment of the present invention, and FIG.
It is a partial cross-sectional plan view. In addition, in these FIGS. 1 and 2,
The same parts as in the above-mentioned conventional example are given the same reference numerals, and the explanation thereof will be omitted.

In FIGS. 1 and 2, the rotary transformer 10 is inserted into the fitting part of the upper drum 2 and fixed to the lower end of the upper drum by a presser metal fitting 12, which is attached to the lower end surface of the rotary transformer rotor. Press down and attach it to the upper drum. The rotary transformer stator 11 is inserted into the lower drum 1 with the rotary transformer holder 13 combined, and fixed by inserting the mounting screws 14 into the pre-provided through hole of the lower drum and the screw hole of the rotary transformer holder. do. Here, the rotary transformer fitting parts of lower drums 1 and 2 are at the standard height,
The diameter of the upper drum 2 is finished with extremely high precision.
Even after the rotary transformers are fitted onto the upper surface of the disk 3, the positions of the rotary transformers are maintained such that the gaps between the rotary transformers are uniform and the displacement in the height direction is kept to a minimum.

[0008]

As described above, the present invention provides a rotary magnetic head drum in which the holder portion fixed to the rotary transformer stator of the stationary drum is attached by a fastening member inserted from the lower end of the stationary drum. Since the stator and fixed drum are arranged in a removable manner, by fixing the rotary transformer stator to the lower drum with screws, it not only improves the positioning accuracy of the rotary transformer stator, but also improves the positioning accuracy of the lower drum. It is also expected that when a component defect or performance defect occurs during assembly, parts can be easily replaced and corrected, leading to a significant increase in productivity.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing an embodiment of a coaxial rotary transformer mounting mechanism according to the present invention.

FIG. 2 is a partially sectional plan view showing an embodiment of the attachment mechanism of the coaxial rotary transformer of the present invention.

FIG. 3 is a longitudinal sectional view showing a mounting mechanism of a conventional coaxial rotary transformer.

[Explanation of symbols]

1 Lower drum 2 Upper drum 10 Rotary transformer rotor 11 Rotary transformer stator 12 Presser fitting 13 Rotary transformer stator holder 14
mounting screw

Claims (1)

[Claims] Claim 1: In a rotating magnetic head drum, the holder part fixed to the rotary transstator of the stationary drum is attached by a fastening member inserted from the lower end of the stationary drum, so that the rotary transstator and the stationary drum can be attached and detached. A coaxial rotary transformer mounting mechanism characterized by the following: