KR950005651Y1 - Drum for tape recorder - Google Patents

Abstract

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Description

Drum unit of tape recorder

1 is a cross-sectional structural view showing a conventional drum device.

2 is a cross-sectional structural view showing an embodiment of a drum apparatus according to the present invention.

* Explanation of symbols for main parts of the drawings

1, 21: upper drum 2, 22: lower drum

22a: groove 3, 23: motor

3a, 23a: stator 3b, 23b: rotor

23c: substrate 4, 24: axis

5: boss 6, 26: head

7, 27: rotary transformer 8a, 8b, 28a, 28b: bearing

9, 29: stator trance 30: boss

31: elastic member 32: support piece

The present invention relates to a drum device of a tape recorder, and more particularly, to a drum device having a one-degree of freedom torsional vibrometer for lowering the height of the drum to be suitable for camcorders and digital audio tapes that require compact and thin film. .

Conventionally, as shown in FIG. 1, the upper and lower drums 1, 2 and the motor 3 are provided on the shaft 4, and the upper drum 1 is a boss fixed by a fastening member. It is fixed to the shaft 4 as 5, the head 6 is attached to the bottom of the upper drum 1, and the rotary transformer 7 is attached to the bottom of the boss 5. As shown in FIG.

In addition, the lower drum 2 is installed by being supported by the shaft 4 and the bearings 8a and 8b at the lower part of the upper drum 1, and the stator transformer corresponding to the rotary transformer 7 at the upper part ( 9) was installed, and the lower part was provided with a motor 3 composed of a shaft 4, a fixed stator 3a, and a rotor 3b.

The conventional drum device as described above has an increased number of parts, resulting in increased assembly and cost, increased productivity, reduced performance due to cumulative tolerances, and the device is large and heavy, making it unsuitable for miniaturization.

In addition, since the conventional drum device has a two degree of freedom torsional vibration system by the shaft and the upper drum, there is a fear that the screen may be bent due to the resonance, and the signal transmission between the head and the rotary transformer is exposed to the outside. Performance is deteriorated due to noise mixing pressure, and the pressure applied to the bearings supporting the upper and lower drums is changed according to the temperature change, thereby causing a performance deterioration.

This invention has been devised to solve the above problems, and the object of this invention is to reduce the number of parts to achieve compact and light thinning, and to make the drum device have a vibration degree of 1 degree of freedom so that the screen bends due to resonance phenomenon. It is possible to prevent, and to always apply a constant pressure to the bearing to provide a drum device of the tape recorder that can minimize the shaking of the drum device.

A feature of this invention for achieving the above object is a drum unit of a tape recorder having an upper drum with a head and a rotary transformer installed on its bottom surface, and a lower drum with a stator transformer installed on an upper shaft and a motor installed on a lower shaft. The upper drum has a motor installed at the top and a rotary transformer installed at the bottom, a lower drum having a stator transformer formed at the top, an axis fixed to the lower drum and supported by the upper drum and the bearing, and the bearing and the lower drum. And a support piece which is elastically supported by an elastic member, and a boss of a tape recorder which is fixed to a top of the shaft by a fixing member and to which a substrate of the motor is fixed.

Hereinafter, an embodiment of the present invention will be described in detail by the accompanying drawings.

2 is a cross-sectional structural view of the drum apparatus according to the present invention, in which the upper drum 21 is supported by the bearings 28a and 28b and fixed to the shaft 24, and the lower drum 22 is attached to the shaft 24. It is fixed to the lower side of the upper drum (21).

In the upper drum 21, a motor 23 composed of a stator 23a and a rotor 23b is fixed to the upper space portion by a fastening member, and the substrate 23c of the stator 23b is a bearing 28a. It is fixed to the boss (30) supported on the bearing 28a is fixed to the shaft (24). In addition, the head 26 and the rotary transformer 27 are directly connected to the bottom of the upper drum 21 by a conductor.

On the other hand, a stator transformer 29 corresponding to the rotary transformer 27 is installed in the upper space of the lower drum 22, and the elastic member 31 is fitted into the groove 22a formed on the upper surface of the lower drum 22. The support piece 32 is provided to elastically support the bearing 28b.

In such a drum device, when a current is applied to the stator 23a of the motor 23 provided in the upper space of the upper drum 21, a magnetic field is generated, and the rotor 23b rotates.

Therefore, when the upper drum 21 fixed by the rotor 23b and the fastening member rotates about the shaft 24, the head 26 installed on the bottom of the upper drum 21 reads a signal of a tape (not shown) and the upper drum ( 21 is sent to the rotary transformer 27 is rotated together with the rotary transformer 27 is fixed to the lower drum 22 to transmit a signal to the stator transformer 29 does not rotate.

At this time, the rotary transformer 27 and the stator transformer 29 should maintain a proper clearance, which is the rotary transformer 27 and the stator before assembling the boss 30 to which the substrate 23c of the motor 23 is fixed. When the transmission output value of the transformer 29 is in an optimal state, the assembly is fixed and fixed. The bearing 28b of the upper drum 21 is always elastically applied by the support piece 32 elastically installed as the elastic member 31. This reduces damping of the drum unit.

As described above, in the drum apparatus according to the present invention, since the motor 23 is installed in the upper space of the upper drum 21, the number of parts can be drastically reduced, so that the assembly process can be shortened and the cost can be reduced. Suitable for camcorders and digital audio tapes.

In addition, since the motor 23 is installed on the upper drum 21 so that only the upper drum 21 rotates, the oscillation system has one degree of freedom, so that resonance does not occur and the screen is prevented from curling. ) And the wire connection between the rotary transformer 27 are not exposed to the outside, so the conventional noise phenomenon is eliminated.

In addition, the gap between the rotary transformer 27 and the stator transformer 29 is easy to maintain and adjust, and gives a certain elastic force to the bearing 28b is a useful design that can minimize the shaking of the drum device.

Claims (1)

The upper drum 1 is provided with a head 6 and a rotary transformer 7 at the bottom, and the lower drum 2 is provided with a stator transformer 9 at an upper side and a lower drum 2 at a lower side thereof. In the drum device of the tape recorder installed in the upper part, the upper drum 21 is installed in the upper portion and the rotary transformer 27 in the lower portion, and the lower drum 22 formed with the stator transformer 29 in the upper portion. And a shaft 24 fixed to the lower drum 22 and supported by the upper drum 21, the bearings 28a and 28b, and the bearing 28b between the lower drum 22 31, a support piece 32 elastically supported by the tape, and a boss 30 fixed to the upper portion of the shaft 24 by a fixing member and to which the substrate 23c of the motor 23 is fixed. Drum unit of recorder.