JPS6341614Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a tape running adjustment mechanism in a magnetic recording/reproducing device such as a VTR.

Generally, in a rotating head type VTR, a rotating head built into a guide cylinder records and reproduces video signals, and a fixed head records and reproduces audio signals and control signals. For example, an audio and control signal recording/reproducing head (hereinafter referred to as RP head) and an audio erasing head are integrated as an RP head block and are disposed near the tape exit side of the guide cylinder.
Furthermore, a full-width erasing head is arranged on the tape entry side.

The above-mentioned RP headblock and full-width erase head must be precisely placed in a predetermined position with respect to the guide cylinder, and usually they are mounted together on a substrate to which the guide cylinder is fixed to achieve accuracy.

Further, on the board, in order to make the tape run at a predetermined position in the vertical direction with respect to each head,
A tape height regulating post is provided.

Each of the fixing heads and height regulating posts required tape running adjustment at several locations to ensure good tape running with reference to the guide cylinder fixed on the board.

The conventional tape running adjustment mechanism on the RP headblock side will be explained below with reference to FIG.

The RP headblock 1 is fixed on a first substrate 2, which is supported on a second substrate 4 with a pivot 3 as a fulcrum, and a first adjustment screw 5.
This allows the azimuth angle with respect to the tape 6 to be adjusted.

Also, on the second board is an RP headblock 1.
A second adjustment screw 7 is provided to adjust the height of the second board 9 , and the second board is supported via a support shaft 8 so as to be slidable in the vertical direction relative to the third board 9 .

Furthermore, the third board 9 is a guide cylinder (not shown).
Attach screw 1 to cylinder base 10 where
It is fixed by screws 1 and 11.

In addition, 12 is a tape height regulating post pivotally supported on the cylinder base 10, and an adjustment part 1 at the upper end.
It moves up and down by operating 2a.

Next, regarding the tape running adjustment of the above-mentioned mechanism,
explain.

Tape running adjustment involves adjusting the height direction and tilt angle of the tape with the guide cylinder as a reference. First, set the tape in a running state, and while observing the video and audio playback output, make sure that this is the maximum value. Adjustment part 12 of tape height regulation post 12
Adjust the RP head block 1 and the tape height regulating post 12 to the optimum position using the second adjusting screw 7.

Next, adjust the azimuth using the first adjustment screw 5, and then adjust the longitudinal inclination of the RP headblock 1 or the back tension pin using an adjustment screw (not shown) while watching the tape run to avoid undue twisting of the tape. Adjust the inclination, etc. (not shown).

Since the adjustment in the height direction and the adjustment in the inclination of the tape mentioned above mutually affect the adjustment of the other, it is necessary to repeat both adjustments several times.

For this reason, these adjustments traditionally required skill;
It took a lot of time and effort.

This invention was made in view of the above points,
The present invention provides a tape running adjustment mechanism that requires less adjustment than conventional ones.

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 shows a partial side sectional view of the mechanism of this embodiment,
Components that are the same as those in FIG. 1 are given the same reference numbers and their explanations will be omitted. Tape height regulation post 1 in this embodiment
00 is installed on the third substrate 9, and includes a second adjustment section 102 that independently adjusts the tape height, and a first adjustment section 101 that adjusts the tape height and the RP headblock 1 height simultaneously. It is characterized by having it on the same axis.

More specifically, the first adjustment section 101 includes a central shaft 101a that passes through the second substrate 4 and is caulked to the third substrate 9, and has a thread formed on the upper end, and an adjustment screw 101b that is screwed into the central shaft 101a. It consists of
The second adjustment section 102 is composed of a cylindrical body 102a that is caulked to the second substrate 4 and has a thread formed at its upper end, and an adjustment nut 102b that is screwed into the cylindrical body 102a.

Further, a sleeve 103 is disposed around the outer periphery of the cylinder 102a, and coil springs 104,
105 is installed.

Therefore, the second substrate 4 and the sleeve 103 move together by adjusting the first adjustment section 101,
In addition, by adjusting the second adjustment section 102, the sleeve 1
Only 03 moves.

When performing tape running adjustment using the above-mentioned adjustment mechanism, first, the tape is set in a running state, and the second adjustment unit 102 is adjusted while observing the audio playback output.
The relative height relationship between the RP headblock 1 and the sleeve 103 is adjusted.

Next, the first adjustment section 101 adjusts the height of the RP headblock 1 and the sleeve 103 as a whole so that the video reproduction output is maximized.

Furthermore, the above-described tilt angle adjustment and height adjustment are repeated alternately.

Here, when adjusting the height, since the relative height of the RP headblock 1 and the sleeve 103 has been adjusted in advance, there is no need to adjust it again.

As described above, according to the present invention, the relative heights of the fixed head block and tape height regulating post can be adjusted in advance, so there is no need to precisely adjust them during the adjustment process. Without,
The number of adjustments can be greatly reduced.

[Brief explanation of the drawing]

FIG. 1 is a side view of a conventional tape travel adjustment mechanism, and FIG. 2 is a side view of a tape travel adjustment mechanism according to an embodiment of the present invention. 1...RP headblock (fixed headblock), 100...tape height regulation post, 4...
Second substrate (substrate), 10... cylinder base (base), 101... first adjustment section (first adjustment means), 1
03... Sleeve (tape guide), 102...
Second adjustment section (second adjustment means).

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A base 10 includes a board 4 to which a fixed head block 1 and a tape height regulating post 100 are attached.
a first adjusting means 1 for moving the tape traveling position and the fixed head block 1 together in the tape width direction;
01, the tape guide 103 provided on the tape height regulating post 100 and having tape end regulating portions arranged on both upper and lower sides is moved in the tape width direction, and the relative relationship between this tape guide 103 and the fixed head block 1 is adjusted. A tape running adjustment mechanism comprising: a second adjustment means 102 for adjusting the relationship. (2) The tape running adjustment mechanism according to claim 1, wherein the first and second adjusting means are arranged coaxially.