KR19980023820A - V-Cal audio / control head mounting structure - Google Patents

Abstract

The present invention relates to an audio / control head mounting structure of a VR, and more particularly, to an improvement of the audio / control head mounting structure for reading audio signals and control signals from a tape from which a video signal is read through a head drum assembly. Regarding, the head plate 30 is elastically fixed to the height adjustable on the support shaft 40 is fixed to the main base 1, having a fixing portion 34 protruding upward on one side; The audio / control head 8 is fixed to the upper surface, and one side is elastically fastened so as to be tiltable with respect to the head plate 30, and on the other side, the line is perpendicular to the surface of the audio / control head 8. The tilting plate 50 is provided with a tilting plate 50 to which the fixing hole 54 is coupled to the fixing part 34 so that the tilting plate 50 rotates around the coupling point of the fixing hole 54 and the fixing part 34. It is characterized by minimizing the height change of the audio / control head 8 during tilting adjustment.

Description

V-Cal audio / control head mounting structure

The present invention relates to an audio / control head mounting structure of a VR, and more particularly, to an improvement of the audio / control head mounting structure for reading audio signals and control signals from a tape from which a video signal is read through a head drum assembly. It is about.

In general, VR is a device for recording a video signal and an audio signal on a magnetic recording tape or reproducing a recorded signal. The video head scans a video signal and the audio / control head scans audio and tape transfer control signals, respectively. It is provided. Tape cassettes applied to V-Cal are mainly composed of video signal tracks in the center and audio signal and control signal tracks in the top and bottom, respectively. Will be able to maintain.

1 illustrates a general V-Cal configuration, which includes a traveling system for moving a tape along a predetermined path on the main base 1, a tape cassette C, and driving the tape T in a selected direction. Supply reel 10 and the winding reel 20 is provided.

The traveling system is provided with a head drum assembly 2 including a video head which rotates in contact with the tape from the tape cassette and records or reproduces a signal recorded on the tape. In addition, the odometer is provided with an audio / control head 3 for reproducing an audio signal, and a capstan shaft 5 which rotates by the capstan motor 4 and cooperates with the pinch roller 6 to drive the tape T. Is installed. In addition, the guide rollers 12a and 22a and the warp poles which move along the guide grooves 11 and 21 arranged in a shape surrounding the both sides of the head drum assembly 2 on the main base 1 to form a tape loading ( 12b and 22b, the supply side pole base 12 and the winding side pole base 22 are provided, respectively. The traveling system is rotatably installed in the main base 1, and the tension generated during the tape running is provided. There is provided a tension lever 8 having a tension pool 8a to be adjusted.

And a reel driving device for driving any one of the reel selected from the supply reel (10) or the reel (20) by receiving power from the capstan motor (4) between the supply reel (10) and the take-up reel (20) ( 7) is installed.

On the other hand, the audio / control head must undergo various adjustments. First, the video signal is read from the head drum assembly 2, and the audio signal is read from a certain distance behind it, so that the video and audio match. To adjust the X distance to adjust the height of the audio / control head (9) to the running height of the tape, and to adjust the inclination angle of the audio / control head to cope with the tension acting differently on the top and bottom of the tape. Tilting adjustment should be performed.

Therefore, in the related art, the torsion spring 36 is interposed on the support shaft 40 fixed to the main base 1 as shown in FIGS. 2 and 3 and elastically by the nut 32 fastened at the upper end thereof. A fixed head plate 30 is provided. And one side is elastically fastened by a tilting screw 52 which is fastened to the head plate 30 through the compression coil spring 56 through the compression coil spring 56 between the head plate 30, A tilting plate 50 having a fixing hole 54 supported at the tip of the fixing portion 34 protruding in a conical shape on the head plate 30 is provided. The audio plate is provided on the tilting plate 50. The control head 8 is fixed. Meanwhile, an eccentric adjustment cam which is eccentrically supported by the main base 1 on one side of the head plate 30 and rotates the head plate 30 about the support shaft 40 by rotation. 60 is provided. The torsion spring 36 is elastically supported to provide a force to rotate in the direction of rotation restriction by the eccentric adjustment cam 60 while simultaneously striking the upper portion of the head plate.

This V-Cal is started to run by the cooperation of the capstan shaft 5 and the pinch roller 6 when the tape loading is completed. At this time, the tape is withdrawn from the supply reel (10) and passed through the test pole (8a) to the supply side guide roller (12a) and the supply side inclination (12b) and enters the head drum assembly (2), head drum assembly (2) The video signal is read by the video head 8 in the course of passing through the tape. The tape passed through the head drum assembly 2 passes through the winding side warp pole 22b and the winding side guide roller 22a. It passes through the control head (8). At this time, the audio / control head guides the tape and contacts the tape and reads out the audio and control signals recorded on the tape. The tape passing through the audio / control head 8 is wound on the supply reel 20 which is rotationally controlled by the capstan motor 4 through the capstan shaft 5 and the pinch roller 6.

On the other hand, the audio / control head and the audio / control head by rotating the head plate 30 around the support shaft 40 by rotating the eccentric adjustment cam 60 to obtain the ideal image quality and sound quality at the first installation The operation of adjusting the distance between the head drum assembly 2, that is, the X distance adjustment operation is performed, and then, by tightening or loosening the nut 32, the audio / control head 8 is adjusted to match the running height of the tape. You will adjust the height. That is, when the nut is loosened, the head plate 30 rises due to the restoring force of the torsion spring 36, and when the nut 32 is tightened, the torsion spring 36 is compressed and the head plate 30 descends to lower the audio / control head. (8) is to adjust the height. Then, the tilting screw 52 is used to perform the tilting adjustment operation so that an ideal tension difference occurs at the upper end and the lower end of the tape T.

However, such an audio / control head was not easy to adjust, but had a problem of inaccurate adjustment.

That is, as shown in FIG. 3, the point where the fixing hole 54 of the tilting plate 50 is supported by the fixing part 34 of the head plate 30 is forward than the surface of the audio / control head 8. Since a certain distance (δ) protrudes, the height of the audio / control head 8 is greatly changed when the tilting adjustment is performed. Therefore, the height adjustment should be performed again. Therefore, the adjustment work was delayed and it was difficult to secure the precision of the adjustment. More specifically, in various adjustments of the audio / control head, the adjustment distance has a very fine size, for example, an adjustment range in units of microns (μ). Nevertheless, in the related art, when the tilting adjustment is performed as shown in FIG. 5, the tilting plate 50 rotates based on the fixed point O, and the lower end of the audio / control head 8 has a relatively high height. Since the change of the height H1 is required, the height of the head plate 30 whose height adjustment is completed must be readjusted, so that the adjustment work is delayed and the accuracy of the adjustment becomes difficult.

Accordingly, the present invention has been made to solve the above problems, the object is to improve the mounting structure of the audio / control head to minimize the height change during the tilting adjustment work to solve the trouble of performing the height adjustment work again On the other hand, it is to provide a V-Cal audio / control head mounting structure that can improve the accuracy of the adjustment.

Figure 1 is a schematic plan view showing the configuration of the mechanism of the general V-AL

Figure 2 is a plan view showing the configuration of a conventional audio / control head mounting structure

Figure 3 is a side cross-sectional view showing the configuration of a conventional audio / control head mounting structure

Figure 4 is a side cross-sectional view showing the configuration of the audio / control head mounting structure according to the present invention

5 is a conceptual diagram showing a change in the height of the tape at the time of the tilt adjustment of the conventional audio / control head

6 is a conceptual diagram showing a change in tape height during tilting adjustment of an audio / control head according to the present invention.

♣ Explanation of symbols for the main parts of the drawing ♣

1: main base 2: head drum assembly

30: head plate 40: support shaft

32: nut 34: fixing part

36: torsion spring 50: tilting plate

52: tilting screw 54: fixing hole

56: compression coil spring

An object of the present invention is a head plate having a fixing portion protruding upwardly on one side is elastically fixed to the height adjustable on the support shaft fixed to the main base; An audio / control head is fixed to the upper surface, and one side is elastically fastened so as to be tiltable with respect to the head plate, and a fixing hole formed on a line perpendicular to the surface of the audio / control head is coupled to the fixing part at the other side. With a tilting plate formed, the tilting plate may be rotated about the coupling point of the fixing hole and the fixing part, thereby minimizing the height change of the audio / control head.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the audio / control head mounting structure of V-Cal according to the present invention will be described in detail.

Figure 4 shows the mounting structure of the audio / control head according to the invention, according to which the invention is via a torsion spring 36 on the support shaft 40 fixed to the main base 1, at the top The head plate 30 is elastically fixed by the fastening nut 32 is provided. And tilting one side is elastically fastened by a tilting screw 52 which is fastened to the head plate 30 through the compression coil spring 56 through the compression coil spring 56 between the head plate 30. Plate 50 is provided. On the tilting plate 50 a conventional audio / control head 8 is fixed.

In the present invention, the fixing hole 54 is formed on one side of the tilting plate 50 in a line perpendicular to the surface of the audio / control head 8.

On the other hand, on the head plate 30 is formed a fixing portion 34 protruding upward to be inserted into the fixing hole 54 to prevent the flow of the tilting plate 50 and at the same time the tilting plate 50 during the adjustment operation It is configured to act as the center of rotation of.

According to the present invention having such a configuration, various adjustment operations, that is, X distance adjustment operation and head height adjustment operation and tilting adjustment operation, are performed in the same manner as before.

At this time, the audio / control head according to the present invention is extremely fine height change of the audio / control head during the tilting operation. That is, the center of rotation of the tilting plate 50, that is, the fixed point O is coaxial with the surface of the audio / control head 8 during the tilting adjustment operation as shown in FIG. The curve drawn by the bottom of the control head draws a circle around the fixed point. Therefore, the height change of the audio / control head 8 can be minimized because the tilting adjustment is made at the smallest height change for each change.

As described above, the audio / control head mounting structure of V-C according to the present invention places the center of rotation of the tilting plate on the line perpendicular to the surface of the audio / control head during the tilting adjustment operation. Since the height change of the control head is extremely minute, it is not necessary to redo the height adjustment work, so that the adjustment work becomes easy and the accuracy of the adjustment is secured.

Claims (1)

A head plate 30 fixedly elastically adjustable on a support shaft 40 fixed to the main base 1 and having a fixing part 34 protruding upward on one side thereof; The audio / control head 8 is fixed to the upper surface, and one side is elastically fastened so as to be tiltable with respect to the head plate 30, and on the other side, the line is perpendicular to the surface of the audio / control head 8. The tilting plate 50 is provided with a tilting plate 50 having a fixing hole 54 to be coupled to the fixing part 34 so that the tilting plate 50 rotates around the coupling point of the fixing hole 54 and the fixing part 34. V-Audio's audio / control head mounting structure, characterized in that the height change of the audio / control head (8) is minimized during the tilting adjustment.