KR19980059033A - Headdrum Assembly of Tape Recorder - Google Patents

Abstract

The present invention relates to a head drum assembly of a tape recorder, and more particularly, to a head drum assembly for recording / reproducing from a magnetic recording tape. The head drum assembly is press-fitted to a fixed shaft and upper and lower outer peripheral surfaces of the fixed shaft, respectively, An oilless bearing consisting of an upper and lower drum forming a window, a bearing portion slidingly supported on a fixed shaft, a support plate extending a predetermined length from the center outer peripheral surface of the bearing portion, the inner upper surface of the lower drum and the lower surface of the oilless bearing support plate. A drum motor positioned between the fixed motor and an upper surface of the support plate of the oilless bearing, and a trans rotor provided with a plurality of heads fixed at a predetermined length exposed to the head window at the outer end thereof; And a trans stator fixedly installed on an inner lower surface of the upper drum to form an electrical signal. For example, the oilless bearing rotates about the fixed shaft and the head fixed on the trans rotor fixedly mounted on the support plate, thereby recording / reproducing, so that the load bearing ability in the radial direction and the thrust direction can be easily performed. It is possible to ensure stable recording / reproducing, and in particular, the drum motor is located on the inner surface of the upper and lower drums, thereby achieving compactness of the entire unit.

Description

Headdrum Assembly of Tape Recorder

The present invention relates to a tape recorder, and more particularly to a head drum assembly for recording / playback from a magnetic recording tape.

1 shows a headdrum assembly of a typical tape recorder.

The upper drum 2 is fixed to the upper end of the rotating shaft 1 with its head 2a fixedly installed on the inner side via a fixing screw S, and the lower drum 3 is attached to the lower end of the rotating shaft 1. The rolling bearing is supported by the upper and lower ball bearings B and B '.

On the other hand, on the corresponding inner surface of the upper and lower drums, the trans rotor 4 and the trans stator 5 for forming a predetermined electric signal while maintaining a constant gap therebetween are fixedly installed through an adhesive.

Also located below the rotating shaft 1 is a drum motor 6 having a motor rotor 6a and a motor stator 6b.

Reference numerals 7 and 7 'are preload bosses provided to apply predetermined preloads to the upper and lower bearings B and B'.

However, the conventional head drum assembly configured as described above has many problems listed below.

First, since the lower drum 3 is supported to support rolling bearings through a plurality of ball bearings B and B ', the unit cost rises and workability is deteriorated. , B ') The problem of lowering the degree of rotation has been caused by mutual concentricity, that is, the axis center is not exactly matched.

Second, in order to apply a predetermined preload on the upper and lower bearings (B, B '), a plurality of preload bosses (7, 7') should also be provided, which also leads to an increase in unit cost and workability.

Third, since the drum motor 6 is located below the rotary shaft 1, there is a problem in that the entire assembly can not be made compact.

Accordingly, the present invention has been made in view of the above-mentioned conventional problems, and an object thereof is to improve the degree of rotation, and in particular, to provide a head drum assembly of a tape recorder capable of reducing unit cost and improving assembly performance. .

1 is a cross-sectional view of a typical headdrum assembly.

2 is a cross-sectional view of the headdrum assembly of the tape recorder according to the present invention.

Figure 3 is an enlarged cross-sectional view showing an oilless bearing in the head drum assembly according to the present invention.

Figure 4 is a bottom view of the main portion excerpt of Figure 3;

* Explanation of symbols for main parts of the drawings

10: fixed shaft 20, 30: upper and lower drum

40: oilless bearing 41: bearing part

41a: herringbone shaped group 42: support plate

50: drum motor 51: motor rotor

52: motor stator 60: transformer rotor

70: trans stator W: head window

H: head

In order to achieve the above object, the head drum assembly of the tape recorder according to the present invention has a fixed shaft and upper and lower portions respectively mounted on the upper and lower outer circumferential surfaces of the fixed shaft, and the upper and lower portions of the tape recorder form a head window through each other's edge surfaces. An oilless bearing positioned between a drum, an inner surface between the upper and lower drums, a bearing portion sliding on the fixed shaft, a support plate extending a predetermined length from a center outer peripheral surface of the bearing portion, and an inner side of the lower drum; A drum motor comprising a motor stator and a motor rotor positioned between an upper surface and a lower surface of the support plate of the oilless bearing, and is fixedly installed on an upper surface of the support plate of the oilless bearing, and an outer end of the head window formed by the upper and lower drums. A transformer provided with a plurality of heads fixed to be exposed to a predetermined length, and the transformer rotor And a head drum assembly of a tape recorder including a trans stator fixedly installed on an inner lower surface of the upper drum to form a predetermined electric signal while maintaining a constant gap therebetween.

Hereinafter, a preferred embodiment of the head drum assembly of the tape recorder according to the present invention will be described.

2 is a cross-sectional view of the head drum assembly according to the present invention, Figure 3 is an enlarged cross-sectional view showing an oilless bearing, Figure 4 is a bottom view of the main portion of FIG.

As shown therein, the head drum assembly of the tape recorder according to the present invention is roughly divided into a fixed shaft 10, upper and lower drums 20 and 30, and an oilless bearing 40.

The upper and lower drums 20 and 30 described above are press-fitted on the upper and lower outer peripheral surfaces of the fixed shaft 10, and in particular, the edges of the upper and lower drums maintain a predetermined gap to form the head window (W). Meanwhile, the oilless bearing 40 is interposed between the inner and outer surfaces of the upper and lower drums 20 and 30 and includes a bearing portion 41 in sliding contact with the outer circumferential surface of the fixed shaft 10. Moreover, the support plate 42 is integrally formed by the predetermined length from the center outer peripheral surface of this bearing part 41 integrally.

As the driving motor 50 is provided as a driving source for rotating the oilless bearing 40 as described above, the motor rotor 51 constituting the driving motor 50 is supported by the support plate of the oilless bearing 40. 42) It is fixedly installed on the lower surface, and the motor stator 52 which maintains a predetermined gap with the motor rotor 51 is fixedly installed on the upper inner surface of the lower drum 30 through an adhesive.

In addition, a trans rotor 60 is fixedly installed on an upper surface of the support plate 42 of the oilless bearing 40, and the outer end of the trans rotor 60 is formed by the upper and lower drums 20 and 30 described above. A plurality of heads H for recording / reproducing from a magnetic recording tape (not shown) that are exposed to the head window W by a predetermined length are fixedly installed.

On the other hand, the trans stator 70 for forming a predetermined electrical signal while maintaining a constant gap with the trans rotor 60 is fixedly installed on the inner lower surface of the upper drum (20).

At this time, when the oilless bearing 40 is rotationally driven by the drum motor 50, it is possible to secure the load bearing capacity in the radial direction through the bearing portion 41. In addition, the lower surface of the bearing portion 41 of the oilless bearing 40 facing the inner top surface of the lower drum 30 in a radial manner as shown in FIG. 4 so as to secure the load bearing ability in the trust direction. It is preferable to form the herringbone-shaped groove | channel 41a.

In the head drum assembly of the tape recorder according to the present invention configured as described above, the oilless bearing 40 slides on the fixed shaft 10 by the drum motor 50, that is, the motor rotor 51 and the motor stator 52. When driven to rotate through the bearing portion 41, the head (H) exposed a predetermined length to the head window (W) formed by the upper and lower drums (20, 30) fixedly installed at the end of the transformer rotor 60 is Recording / reproducing is performed from a magnetic recording tape (not shown).

At this time, the signal from the head (H) is transmitted directly to the trans rotor 60 and at the same time converted into an electrical signal by the trans stator 70 fixed to the inner lower surface of the trans rotor 60 and the upper drum (20). And is transferred to the preamplifier through a flexible wire (not shown).

As the signal from the head H is directly transmitted to the transformer rotor 60, the loss of the signal is reduced. In particular, the wiring work and the hole for the connection between the head H and the transformer rotor 60 are performed separately. Processing and the like become unnecessary.

On the other hand, when the oilless bearing 40 is rotated while being slidly supported by the bearing portion 41, the oilless bearing 40 is rotated while ensuring the load supporting ability in the radial direction, and in particular, a herringbone shape formed on the lower surface of the bearing portion 41. Through the floating effect between the groove portion 41a and the inner upper surface of the lower drum 30, it is possible to obtain a load bearing capacity in the trust direction, thereby obtaining a high degree of rotation accuracy.

As described above, according to the head drum assembly of the tape recorder according to the present invention, recording / reproducing is performed through an oilless bearing rotating about a fixed shaft and a head fixed on a trans rotor fixed to the support plate thereof. Since the load bearing capacity in the radial direction and the thrust direction can be easily secured, stable recording / reproducing can be performed. In particular, the drum motor is located on the inner side of the upper and lower drums, making the whole unit compact. It has an effect.

Claims (2)

The upper and lower drums 20 and 30 are press-fitted to the fixed shaft 10 and upper and lower outer circumferential surfaces of the fixed shaft 10, respectively, to form the head window W through the edges thereof. Located between the inner surfaces of the upper and lower drums 20 and 30, the bearing portion 41 is slidably supported on the fixed shaft 10, and the support plate extending a predetermined length from the center outer peripheral surface of the bearing portion 41 An oilless bearing 40 made of 42 and a motor stator 52 and a motor rotor 51 positioned between an inner upper surface of the lower drum 30 and a lower surface of the supporting plate 42 of the oilless bearing 40. And a drum motor 50 formed of the upper and lower surfaces of the support plate 41 of the oilless bearing 40, the head window W formed by the upper and lower drums 20 and 30 at the outer end thereof. A plurality of heads H, which are exposed to a predetermined length, are fixed to the transformer rotor 60 and the transformer rotor 60 has a predetermined gap therebetween. The head drum assembly of the tape recorder, characterized in that it comprises a trans stator (70), which is fixed to the inner bottom surface of the upper drum (20) to form a predetermined electric signal. The lower surface of the bearing portion 41 of the oilless bearing 40 facing the inner top surface of the lower drum 30 is provided with a herringbone-shaped groove 41a radially. Headdrum assembly of tape recorder.