KR0160649B1 - Rotary head drum assembly - Google Patents

Abstract

The present invention relates to a rotatable head drum assembly.

The present invention provides a shaft, a rotating drum fixedly rotatable to the shaft, a fixed drum installed opposite to the rotating drum and having a transformer installed therein, and an inner or fixed drum of the rotating drum or the fixed drum. In the rotating head drum assembly provided in a separate fixed member of the outside and provided with a rotor and a stator constituting a motor, and a bearing member installed on a shaft in the rotating drum or fixed drum to facilitate the rotation of the rotating drum. In the rotating drum, a predetermined cup-shaped space is provided at an upper portion thereof, a rotor, which is a rotation driving source, is seated on a bottom surface of the cup-shaped space, a stator for forming a magnetic field is installed at an upper portion of the rotor, and a central shaft of the stator is provided. Cap bearing and set screw are installed to move the rotating drum up and down.

Therefore, the absolute height of the rotating drum and the magnetic head can be easily adjusted by manipulating the set screw even while the rotating drum is rotated. The motor rotor is installed on the rotating drum to prevent torsional resonance in the rotation, so that the information can be accurately Can be recorded and reproduced.

Description

Rotating Headdrum Assembly

1 is a longitudinal sectional view showing the internal structure of a conventional rotatable head drum assembly.

Figure 2 is a longitudinal sectional view showing the internal structure of the rotatable head drum assembly of the present invention.

3 is a state diagram of the lower surface of the cap bearing in the head drum assembly of FIG.

* Explanation of symbols for main parts of the drawings

10,30: head drum assembly 11,31: axis

12,32: rotating drum 13,33: fixed drum

14,36,37: radial bearing 15: sleeve

16: thrust bearing 17,42: magnetic head

18,19,38,39: Rotary transformer 20,41: Rotor

21,40: stator 22: holding member

34: cap bearing 35: set screw

The present invention relates to a rotating head drum assembly, and in particular, by modifying the structure of the bearing device mounted inside the head drum to stabilize the rotation and to easily adjust the absolute height of the rotating head to accurately record and reproduce information. And a rotating head drum assembly. In general, video and audio tape recorders are provided with a rotatable head drum that scans inclined with respect to the running direction of the tape to read information from the running tape or to record low notes on the tape.

In such a tape recording system, in order to record and reproduce high-density / high-definition information, the running speed of the tape and the rotation speed of the head drum must be precisely controlled, and the rotation of the rotating drum with respect to the axis when the head drum is rotated. This requires technical problems such as reducing the height as much as possible and accurately adjusting the absolute height of the rotating head.

1 is a longitudinal sectional view showing the internal structure of a conventional rotatable head drum assembly in which a thrust bearing is used.

Referring to this, the head drum assembly 10 has a structure in which the rotating drum 12 and the fixed drum 13 are fitted to the shaft 11 at the center thereof, respectively. The body of the shaft 11 is supported by a sleeve 15, and the two radial bearings 14, each of which has a predetermined groove formed therein, are mounted at a predetermined distance apart from each other. The thrust bearing 16 in which a plurality of grooves are formed in a spiral form on the center of the disc is provided. A magnetic head 17, which is involved in recording / reproducing information, is provided at an outer predetermined portion of the sleeve 15. In addition, a pair of rotary transformers 18 and 19 are installed in the lower fixed drum 13 of the magnetic head 17. On the other hand, the lower portion of the fixed drum 13 is provided with a fixed member 22 of a predetermined internal space, the center of which is fitted to the shaft 11, the outer portion of the body is coupled to the fixed drum 13, In the fixing member 22, a rotor 20 and a stator 21 constituting a motor are installed.

However, in the conventional rotating head drum assembly having such a structure, as described above, the fixing member 22 having the rotor 20 and the stator 21 installed therein is installed below the fixed drum 13. It is difficult to regulate the concentricity of the outer diameter of the fixed drum 13 with respect to the shaft. This problem of concentricity is directly related to the problem of concentricity of the rotating drum, and eventually, the rotational motion of the rotating drum becomes unstable. In addition, in such a conventional structure, since the upper height of the sleeve 15 is processed to determine the dimensions, it is impossible to adjust the absolute height of the magnetic head 17 from the lower end of the fixed drum 13. In addition, the torsional vibration occurs because the rotors 12, 15, and 16 are spaced apart from the rotor 20, which is the rotation driving source, and the magnetic head 17 is observed and measured in the rotational motion of the rotary drum 12. And there is a problem that can not be adjusted.

The present invention has been created to solve the above problems, the rotation type to change the structure of the bearing device to improve the stabilization of the rotation and to easily adjust the absolute height of the rotating head to enable accurate recording and reproduction of information The purpose is to provide a head drum assembly.

In order to achieve the above object, the head drum assembly according to the present invention includes a shaft, a rotating drum fixedly rotatable to the shaft, and a fixed drum installed opposite to the rotating drum and having a transformer installed therein. And a rotor and a stator constituting the motor and installed in a separate fixing member inside or outside the fixed drum of the rotating drum and the fixed drum, and a shaft in the rotating drum or the fixed drum to smoothly rotate the rotating drum. In the rotary head drum assembly provided with a bearing member provided, a predetermined cup-shaped space is provided at the upper portion of the rotating drum, and a rotor, which is a rotational driving source, is seated on the bottom of the cup-shaped space, and a magnetic field is applied to the upper portion of the rotor. The stator to be formed is installed, the central axis of the stator for moving the rotating drum up, down The capping and the set screw are installed in the topping.

With this structure, it is possible to easily adjust the absolute height of the magnetic head fixed to the rotating drum by freely moving the rotating drum up and down during the rotation of the rotating drum.The rotor and the stator are installed on the body of the rotating drum and the rotating drum There is an advantage that can stabilize the rotational concentricity of.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is a longitudinal sectional view showing the internal structure of the rotatable head drum assembly of the present invention.

Referring to this, the rotatable head drum assembly 30 according to the present invention forms a structure in which the rotating drum 32 and the fixed drum 33 are fitted to the shaft 31 at the center thereof, respectively. Two radial bearings 36 and 37 are mounted on the inner shaft 31 of the rotary drum 32 at a predetermined distance, and are mounted upwards and downwards, and a cap bearing 34 is disposed on the upper radial bearings 36. ) Is press-fit to the shaft 31, the set screw 35 is installed in the center of the cap bearing (34). That is, a screw corresponding to the set screw 35 is formed on the inner surface of the central groove of the cap bearing 34 on which the set screw 35 is installed, so that the set screw 35 and the cap bearing 34 have a screw coupling structure. . Here, in particular, the cap bearing 34 has a spiral groove over its lower and side portions, as shown in FIG. 3, in order to collect the injected oil into the center to facilitate smooth rotation with the shaft 31. : 34g) is formed.

In addition, the outer side of the cap bearing 34, the stator 40 for the motor configuration is installed to surround the cap bearing 34, the lower portion of the stator 40 to form a motor together with the stator 40 to rotate the driving force The rotor 41 which generate | occur | produces is provided. In addition, a magnetic head 42, which is involved in recording / reproducing information, is fixedly installed at a predetermined portion of the body of the rotating drum 32.

On the other hand, the fixed drum 33 is provided with a pair of rotary transformers (38, 39) for converting the applied voltage to a predetermined value.

In the head drum assembly of the present invention having such a structure, when the player's starting button is operated, the rotating drum of the head drum assembly is rotated, and the information on the tape is reproduced or reproduced by the magnetic head installed in the rotating drum. The predetermined information is recorded on the tape.

In such a head drum, the head drum to which the fluid bearing is applied undergoes inspection of the rotating drum, ie, step, protrusion, angle division, etc. while rotating the rotating drum at a predetermined rotation speed due to the clearance between the radial bearing and the shaft. Normally inspections and measurements are made at the time of rotation, and adjustments are made at the stop of the rotation. However, the head drum assembly of the present invention is provided with a cap bearing and a set screw on the upper shaft of the rotating drum, it is possible to adjust during the rotation of the rotating drum. That is, when the set screw is rotated in a predetermined direction, the rotating drum moves linearly upwards or downwards. As a result, the magnetic head fixed to the rotating drum is also linearly moved upwards or downwards simultaneously. Is easily adjusted.

As described above, the rotatable head drum assembly of the present invention is provided with a cap bearing and a set screw for moving the rotating drum up and down at the upper end of the central shaft of the rotating drum to operate the set screw even while the rotating drum is rotating. This makes it possible to easily adjust the absolute height of the rotating drum and the magnetic head, thereby reducing the labor required for the inspection and adjustment of the rotating drum. The motor rotor is installed on the rotating drum, and the torsional vibration in the rotation of the rotating drum. Can be accurately recorded and reproduced.

Claims (2)

A shaft, a rotating drum fixedly rotatably mounted on the shaft, a fixed drum installed opposite to the rotating drum and having a transformer installed therein, and a separate inside or outside the fixed drum. In the rotating head drum assembly is provided in the fixed member of the rotor and the stator constituting the motor and a bearing member provided on the axis of the rotating drum or the fixed drum to facilitate the rotation of the rotating drum, The rotating drum is provided with a predetermined cup-shaped space at the top thereof, a rotor, which is a rotation driving source, is seated at the bottom of the cup-shaped space, a stator for forming a magnetic field is installed at the upper portion of the rotor, and the rotating drum is provided at the central axis of the stator. Rotating type, characterized in that the cap bearing and set screw for moving up and down is installed Headdrum assembly 2. The rotatable head drum assembly according to claim 1, wherein spiral grooves are formed in the body side and bottom surfaces of the cap bearing.