KR950006327Y1 - Low friction headdrum for vcr - Google Patents

Abstract

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Description

VEAL's Low Friction Head Drum

1 is a cross-sectional view showing a low friction head drum of a general V-Cal.

2 is a cross-sectional view showing a low friction head drum of V-seal according to the present invention.

Figure 3 is a front view of the lower drum constituting the low friction head drum of V-seal according to the present invention.

4 is a front view of a lower drum constituting a low friction head drum of V-C in the prior art.

* Explanation of symbols for main parts of the drawings

15: lower drum 15a: slope

17: upper drum 19: middle drum

The present invention relates to a head drum of VCR (VCR). In particular, the low friction head of V-CAL reduces the load on the tape running on the outer circumferential surface of the head drum, thereby improving the running stability of the tape. It is about a drum.

As shown in FIG. 1, the head drum of a general V-Cal comprises a motor unit 1 for transmitting power, a rotation shaft 2 rotated by driving of the motor unit 1, and the rotation shaft 2. A lower drum 5 supported by bearings 3 and 4 at a lower portion thereof, a flange 6 press-fitted to an upper portion of the rotary shaft 2, and an upper drum 7 fixed to the flange 6; And a plurality of heads 8 fixed to the lower surface of the upper drum 7, a trans stator 9 and a transformer fixed to the lower surface of the lower drum 5 and the lower surface of the flange 6 at regular intervals. The rotor 10 is comprised.

The head drum of the V-Cal configured as described above, when the rotating shaft 2 is rotated by the driving of the motor unit 1, the upper drum 7 fixed to the upper portion of the rotating shaft 2 is rotated, the head 8 Is to record the signal on the tape wound on the outer peripheral surface of the lower drum (5) and the upper drum (7) or to reproduce the signal of the tape.

In this case, as shown in FIG. 4, the lower drum 5 has a lead line formed on the outer circumferential surface at a predetermined inclination angle, so that the driving operation of the tape is guided along the lead line.

However, in the head drum of a general BC as described above, the upper drum 7 is rotated while the lower drum 5 is stopped, and the friction between the lower drum 5 and the upper drum 7 is performed. Since the coefficients are different from each other, the frictional force applied to the tape in contact with the lower drum 5 and the tape in contact with the upper drum 7 is not constant. There was a problem that the jitter (JITTER) that the screen becomes unstable due to the stick slip phenomenon occurs due to the speed nonuniformity in the driving direction.

The main object of the present invention is to provide a low friction head drum of V-CAL to reduce the load of the tape running on the outer circumferential surface of the head drum, thereby improving the running stability of the tape.

Another object of the present invention is to provide a low friction head drum of V-CAL to obtain a better quality screen by preventing the stick slip phenomenon caused by the tape shaking finely or the speed unevenness to the running direction of the tape.

As described above, in order to achieve the object of the present invention, in the head drum of the BC-R, the role of the lead line is fixed to the lower side of the upper drum, the middle drum having the same diameter, the lower end of the tape is supported on the lower drum A low friction head drum of V-C is provided by forming an inclined surface.

Hereinafter, the V friction low friction head drum according to the present invention will be described according to the embodiment shown in the accompanying drawings.

2 is a cross-sectional view showing a low friction head drum of V-Cal according to the present invention, and FIG. 3 is a front view of a lower drum constituting the low friction head drum of V-Cal according to the present invention. The low friction head drum of V-Cal has a motor unit 11 for transmitting power, a rotating shaft 12 rotated by the driving of the motor unit 11, and a bearing 13 at the lower portion of the rotating shaft 12. And a lower drum (15) having an inclined surface (15a) in the form of a lead line (LEAD LINE) on which the lower end of the tape (T) is supported on the upper surface and the upper side of the rotating shaft (12). A flange 16, an upper drum 17 fixed to the flange 16, several heads 18 fixed to a lower surface of the upper drum 17, and the same diameter as the upper drum 17. Intermediate drum 19 is fixed to the lower surface of the upper drum 17, the bottom and the bottom of the lower drum 15 At predetermined intervals on the lower face of the support (16) consists of a transformer stator 20 and the rotor transformer 21 is fixed, respectively.

The diameter of the lower drum 15 is larger than the diameter of the upper drum 17 and the intermediate drum 19 by a thickness difference t by the existing lead line (see FIG. 4).

The lower drum 15 has a stepped portion 15b formed in the inner circumferential wall, and the lower end of the intermediate drum 19 is inserted, and the lower drum 15 and the intermediate drum 19 have a minimum gap. GAP is held to prevent interference with each other.

The low friction head drum according to the present invention configured as described above has an upper drum 17 fixed to the upper portion of the rotating shaft 12 when the rotating shaft 12 is rotated by the driving of the motor unit 11. As the head 18 is rotated, the head 18 performs a conventional operation of recording a signal or reproducing a signal on the tape wound on the outer circumferential surfaces of the lower drum 15 and the upper drum 17.

At this time, since the middle drum 19 of the same diameter is fixed to the lower portion of the upper drum 17, the lower drum 15 has a lead line inclined surface (15a) is formed on the upper surface so that the tape (T) is wound The upper drum 17 and the intermediate drum 19 are integrally rotated, and the tape T is driven while being guided by the inclined surface 15a formed on the lower drum 15 which is fixed. It is to improve the driving safety of (T).

As described above, the V friction low friction head drum according to the present invention has a middle drum of the same diameter fixed to the lower part of the upper drum so as to be rotated integrally. By guiding the traveling operation, the frictional force applied to the tape is constant, and since the dynamic friction coefficient is smaller than the finger friction coefficient, the frictional force applied to the tape is reduced, so that the running stability of the tape can be improved.

Therefore, as in the conventional case, it is possible to prevent the occurrence of stick slip and jitter caused by a slight shaking of the tape or a speed nonuniformity with respect to the running direction of the tape, resulting in a higher quality screen. .

Claims (1)

In the head drum of V-CAL, the role of the lead line is fixed to the middle drum 19 having the same diameter in the lower portion of the upper drum 17, the lower end of the tape (T) is supported on the upper surface of the lower drum (15) Low friction head drum of V-C is characterized by forming the inclined surface (15a).