JPH07105519A - Magnetic head adjusting mechanism - Google Patents

Abstract

PURPOSE:To drastically shorten the adjustment in a production stage by providing the mechanism with a member of pressing the lower part of a tape onto a head base and maintaining always the specified mating of the tape and a magnetic head. CONSTITUTION:The surface of a head base 14 to be imposed with an audio control head 49 and an audio erasing head 44 is provided with an azimuth adjusting screw 46, a swing and tilt adjusting screw 41, a screw 45 and a clatter shifting spring 48. The adjusting screw 46 and the screw 45 are fitted by screwing to a chassis 47 and the swing and tilt adjusting screw 41 is fitted by screwing to the head base 42. The clattering shifting spring 48 is inserted to the screw 45 and is compressed between the head of the screw 45 and the head base 42 to keep pressing the head base 42 downward at all times. The head base 42 is shifted laterally by adjusting the azimuth adjusting screw 46 upward and downward around the center line connecting the swing and tilt adjusting screw 41 and the tape guide 43 and eventually, the azimuth of the audio control head 49 is adjusted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an audio / CTL control head adjusting mechanism for a home video tape recorder.

[0002]

2. Description of the Related Art A conventional magnetic head and a tape traveling height adjusting mechanism in a VTR will be described with reference to the drawings. FIG. 3 is a plan view of a conventional VTR device showing a tape running state. A magnetic tape 2 housed in a cassette 1 (shown by a chain line) is pulled out from the cassette 1 and wound around a rotary cylindrical cylinder 5 having a rotary video head through a guide pin 3 and an erasing head 4 at a predetermined angle. 6, the audio control head 7, the fixed post 8, the capstan 9, and the like, and the cassette 1 is formed. A conventional magnetic head height adjusting mechanism and fixed post height adjusting mechanism will be described. 4 to 6 show a support mechanism for an ACE head in which a head for voice and control signals of a helicopter scan type VTR and a head for erasing a voice track are integrated, and a fixed post having a flange for regulating a tape running height. Showing the adjustment mechanism of each plane, side,
There is a front view. The head plate 14 holds the audio control head 7 and the audio erasing head 6, and is supported by the azimuth adjusting screw 10, the tilt adjusting screw 11, the screw 12, the backlash spring 13, the center receiving protrusion 15a of the head arm 15, and the like. It is configured to allow azimuth adjustment and tilt adjustment. 11 and 12 are screwed to 14 and 10 is screwed to 15
0 passes through each of the 14 holes. The tip of 11 is in contact with the recess of the head base 15, the recess of the head base 15 is in contact with the projection 15 a of the head arm 15 with the hole of 14.
The backlash spring 13 and the head through the 12 are 1
It was compressed during 5 and always pulls 14 in the direction of 15. When 10 is turned, 14 including 6, 7 moves like a seesaw around the line connecting 11 and 15a, and the azimuth changes.
When you turn 11, it will rotate around the line connecting 10 and 15a,
Aori and azimuth change simultaneously. A sleep 15a is crimped at 15, and the hole of 15a is perpendicular to the substrate, and a support shaft 17 erected on the substrate 16 is fitted into this by a clearance fit. A torsion spring 18 is sandwiched between the base plate 16 and the head base 15 on the support shaft 17, and 15 is pushed up by the elastic force of the torsion spring 18 in the support axis direction, and is screwed into the screw portion 17 a of the support shaft 17. The movement of the nut 19 is restricted. By turning 19, the height of the entire ACE head block composed of 10 to 15 including 6, 7 can be adjusted. Further, the ACE head block is attached counterclockwise around 17 as seen in FIG. 3, while the movement is regulated by the tape nut 21 screwed to the screw shaft 20 which is erected on the substrate by the twisting force of 18. It is energized. A fixed post 22 having flanges 22a and 22b that corrects the tape inclination by head tilt and regulates tape running height and minute vertical fluctuation is a shaft 23 that vertically stands on the substrate 16.
It is fitted with a clearance fit and has a shaft 23 between 22 and 16.
A spring 24 is compressed through the above and pushes up 22 upward, and its movement is restricted by a nut 25 screwed into a screw portion 23a of a shaft 23. Next, a method of adjusting the tape running height and the head height will be described. The nad 25 is rotated to raise or lower the height of the fixed post 22 so that the tape 2 is located at the center of the flanges 22a and 22b of the fixed post. As a result, the fine vertical movement of the tape causes the flange 22a,
It is regulated by 22b and the tape running becomes stable. Next, the nut 19 is turned to adjust the height of the magnetic head. The height of the magnetic head is adjusted by visually measuring the length of the control signal recorded on the lower end of the tape 2 by the audio control head 7 with a microscope having a scale, and moving the head height up and down.

[0003]

However, in the above-mentioned prior art, if the height of the head tape guide is too high or too low, the adjustment must be repeated many times, which is very inefficient. This has been an obstacle to shortening the adjustment time on the production line. Also, there are many parts,
Problems such as high cost were met.

Therefore, an object of the present invention is to provide a cost reduction by shortening the adjustment time in the manufacturing line and reducing the number of parts.

[0005]

SUMMARY OF THE INVENTION To achieve the above object, the present invention defines the position of the tape core on the audio / control head so that the tape and head are always in relative position.

[0006]

Operation: By using the above head adjusting mechanism, the tape kite can be removed. The head height and tape guide height adjustment can be deleted, and the cost can be reduced.

[0007]

Embodiments of the present invention will be described below with reference to FIGS. 1 is a plan view and FIG. 2 is a front view.

On the head base 14 on which the audio control head 49 and the audio erasing head 44 are placed, an azimuth adjusting screw 46, a tilt adjusting screw 41, a screw 45, and a rattling spring 48 are provided.

The azimuth adjusting screw 46 and the screw 45 are screwed into the chassis 47. Also, the tilt adjustment screw 4
1 is screwed to the head base 42. The backlash spring 48 is passed through the screw 45 and compressed between the head of the screw 45 and the head base 42, and always presses the head base 42 downward.

A tape guide 43 is erected on the head base, and the tape guide 43 is provided with a guide flange 43a. The guide flange 43a that regulates the running height of the tape 50 contacts the lower portion of the tape 50,
The tape travel is regulated. The lower portion of the tape guide 43 is in contact with the upper surface of the chassis 47. The length of the lower part of the tape guide 43 is calculated and set in advance so that the height of the guide flange 43a becomes the tape running height, and the position design between the control head core of the audio control head 49 and the guide flange 43a is also calculated in advance. The dimensions are set.

The head base 42 is a tilt adjusting screw 41.
By adjusting the azimuth adjusting screw 46 up and down around the line connecting the tape guide 43 and the tape guide 43,
As a result, it becomes possible to adjust the azimuth of the audio control head 49. Further, the tilt adjusting screw 41 screwed into the head base is in contact with the chassis 47, and the tilt of the audio control head 49 can be adjusted by adjusting the tilt adjusting screw 41 up and down.

Further, by moving the portion 42a of the head base 42 in the direction of the arrow, the head base 42 can be rotationally moved around the recess 47a provided on the chassis base 47 and the tilt adjusting screw 41, and the audio control head. 49 delicate position adjustments are possible.

With the configuration described above, it is not necessary to adjust the height of the audio control head 49, and the number of parts can be reduced as compared with the conventional configuration.

[0014]

Since the present invention is constructed as described above, it has the following effects.

It is possible to obtain a low-cost VTR because the number of parts can be greatly reduced and the adjustment on the manufacturing line can be greatly shortened.

[Brief description of drawings]

FIG. 1 is a plan view of an embodiment of the present invention.

FIG. 2 is a front view of an embodiment of the present invention.

FIG. 3 is a plan view of a VTR using a conventional mechanism.

FIG. 4 is a plan view of a conventional mechanism.

FIG. 5 is a side view of a conventional mechanism.

FIG. 6 is a front view of a conventional mechanism.

[Explanation of symbols]

41 ... Orientation adjusting screw, 42 ... Head base, 43 ... Tape guide, 44 ... Audio erasing head, 45 ... Screw, 46 ... Azimuth adjusting screw, 47 ... Chassis, 48 ...
Backlash spring, 49 ... Audio control,
50 ... tape.

Claims (1)

[Claims] 1. A magnetic head adjusting mechanism having a magnetic head of a magnetic recording / reproducing apparatus and a head base integrally formed with the magnetic head, wherein a member for contacting a lower portion of the tape is provided on the head base, and the height of the member is increased. And the core position of the magnetic head is set to a predetermined specification so that the relative distance between the tape and the magnetic head is always constant.