JPH0718006Y2 - Fixed magnetic head adjuster - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a device for finely adjusting the position and posture of a fixed magnetic head equipped in a magnetic recording / reproducing device such as a VTR.

(Prior Art) In VTR, in order to accurately track the video track formed on the signal surface of the magnetic tape, the control signal to the tracking servo mechanism is recorded on the magnetic tape, or the control signal from the magnetic tape is recorded. Equipped with a control head to play.

In the VTR shown in FIG. 5, the control head (5) is integrated with the erasing head (50) on the chassis, and is equipped with a rotary magnetic head as a main magnetic head.
It is in sliding contact with the magnetic tape (8) fed from the cylinder (9) through the leading pins (51) (52).

Since the control head (5) slides the magnetic gap portion against the magnetic tape (8) at a predetermined angle, the control head (5) needs to be installed on the chassis in an accurate posture at the assembly stage. In addition, the distance from the magnetic tape (8) to the control head (5) after being detached from the VTR cylinder (9) (the distance along the tape running path from point A to point B in the figure:
(Hereinafter referred to as X distance) is for accurate tracking,
It is necessary to set it to a predetermined value with extremely high accuracy.

Conventionally, in order to finely adjust the position and posture of the control head, a magnetic head adjusting device as shown in FIGS. 6 and 7 has been proposed (Shokai 57-122024).

The adjusting device includes a first base (2) provided on the chassis (1) capable of adjusting a height position and a rotation angle on a horizontal plane as described below, and the first base (2). A second base (3) provided on the top so that the inclination of the front, rear, left and right can be adjusted, and the control head (5) and the erasing head (50) are fixed on the second base (3). Is.

The first base (2) is pivotally supported by a main shaft (13) erected on the chassis (1) so as to be vertically movable and rotatable, and an adjusting nut (15) is screwed to an upper end portion of the main shaft (13). I am fit.

A spring (14) is interposed between the first base (2) and the chassis (1), and the first spring is provided by the spring (14).
The base (2) is biased upward and is rotationally biased counterclockwise.

A column (10) is erected on the chassis (1), and an adjusting tool (16) having a tapered surface is screwed onto the upper end of the column (10), and the first base is attached to the tapered surface. The end face of (2) is pressed by the spring (14).

The second base (3) includes a support pin (20) projectingly provided on the first base (2), and first to third adjustment screws (4) (4) provided on the second base (3). 40) (41) and 1st base (2)
It is arranged substantially horizontally above.

By operating the first adjusting screw (4), the tilt of the control head (5) in the front and rear can be changed,
By operating the adjusting screw (40) and the third adjusting screw (41), the left and right inclination of the control head (5) can be changed.

Thus, the column (10) and the adjusting tool (16) constitute a first adjusting unit for adjusting the X distance, and the first base (2), the second base (3) and both bases are provided. 3 adjustment screws equipped (4)
The (40), (41), the adjusting nut (15), and the like constitute a second adjusting portion for adjusting the posture of the control head (5).

Fine adjustment of the position and orientation of the control head (5)
For example, it is performed by repeating the following operation while referring to the inspection signal obtained by reproducing the inspection magnetic tape.

First, the adjustment nut (15) is rotated to adjust the height of the first base (2).

Next, the first adjustment screw (4) is operated to adjust the front-back inclination of the control head (5), and the second and third
Operate the adjustment screws (40) (41) to correct the left and right postures of the control head (5).

Then, the adjuster (16) is operated to adjust the rotation angle of the first base (2). Along with this, the control head (5) moves along the tape traveling path as shown in FIG. 9, and the contact center between the magnetic tape (8) and the control head (5) changes from point B to point B '. The X distance changes as it changes. Therefore, the X distance can be set to a predetermined value based on the reproduction inspection signal at this time.

(Problems to be Solved) In the above magnetic head adjustment device, the control head (5) is gradually moved to a predetermined posture by alternately repeating the posture adjustment of the control head (5) and the adjustment of the X distance. However, since the first adjusting part and the second adjusting part are mechanically linked to each other as described above, one adjustment causes the other adjusted state to collapse and the adjustment is completed. There was a problem that a great number of man-hours were required.

In particular, when adjusting the posture of the second base (3) by operating each adjustment screw, the height of the control head (5) also changes subtly, so the adjustment nut (15) is used again to adjust the first base ( It is necessary to adjust the height of 2), but as the first base (2) moves up and down, the first base (2) and the adjuster (16)
The contact position with and changes, the rotation angle of the first base (2), and hence the position of the control head (5), changes, and the once adjusted X distance largely deviates from a predetermined value.

Therefore, the position adjustment by the adjuster (16) must be performed from the beginning, and the X distance error may not converge in some cases.

Further, as shown in FIG. 9, when the position of the control head (5) is adjusted, the center position of the sliding contact between the control head (5) and the magnetic tape (8) changes from the point B to the point B '. However, there was a possibility that the sliding contact state would deteriorate.

It is also necessary to stabilize the running of the tape that enters the control head (5).

(Means for Solving Problems) The fixed magnetic head adjusting device according to the present invention solves the above problems by mechanically separating the first adjusting unit and the second adjusting unit.

The first adjusting portion is arranged so as to be capable of advancing and retreating substantially perpendicularly to the tape traveling path between the cylinder (9) and the fixed magnetic head, and regulates the upper and lower traveling positions of the tape and sets the tape at an arbitrary position. It is equipped with a tape guide body that is fixed.

On the other hand, the second adjusting unit is disposed at a position downstream of the first adjusting unit, does not move in the tape running direction and the vertical direction, maintains a stationary position, and is adjustable only in the height direction. A fixed magnetic head is installed in the adjusting part.

The second adjusting unit can have the same configuration as that of the conventional device shown in FIG. 7, for example.

(Operation) The attitude of the fixed magnetic head is adjusted by operating the second adjuster. When adjusting the tilt of the fixed magnetic head to the front, back, left and right,
Although the X distance may change slightly, the second adjusting portion and the first adjusting portion are mechanically separated from each other, so that the X distance is adjusted when the head height is adjusted by operating the second adjusting portion. Does not change.

Next, the X distance is adjusted by operating the first adjusting unit. Also in this case, the second adjusting unit is not affected, and therefore the attitude of the fixed magnetic head once adjusted does not change.

Even if it becomes necessary to adjust the attitude of the fixed magnetic head again, the change in the X distance due to the adjustment is small, and the subsequent adjustment of the X distance is easy.

When the X distance is adjusted, the fixed magnetic head remains fixed, so that the sliding contact state between the magnetic tape and the fixed magnetic head does not change.

The tape entering the control head (5) is regulated in the vertical running position by the tape guides (61) (62).

(Advantages of the Invention) In the fixed magnetic head adjusting device according to the present invention, when adjusting the attitude and position of the magnetic head, one adjustment does not destroy the adjustment state of the other, so the adjustment is less than in the past. It can be done easily and quickly with man-hours. However, these adjustments do not deteriorate the sliding contact state between the magnetic tape and the fixed magnetic head.

Furthermore, the tape is attached by the tape guides (61) (62).
Since the vertical running position is regulated, the running of the tape entering the control head (5) is stable.

(Embodiment) FIGS. 1 and 2 show an example in which the fixed magnetic head adjusting apparatus according to the present invention is applied to a control head of a VTR.

The mechanism of the second adjusting portion is substantially the same as that of the conventional device shown in FIGS. 6 and 7, and a cylindrical sleeve (22) is provided at the end of the first base (2) so as to project from the sleeve. The main shaft (13) erected on the chassis (1) penetrates through (22) and the first base (2), whereby the first base (2) moves up and down along the main shaft (13). It is rotatably supported about a main shaft (13). An adjusting nut (15) is screwed onto the upper end of the main shaft (13) and is in contact with the upper end surface of the sleeve (22).

Between the first base (2) and the chassis (1), a spring (14) which also functions as a torsion spring and a compression spring is fitted on the main shaft (13) and interposed, and one end of the spring (14). Is locked to a stopper (21) provided on the first base (2), and the other end is locked to a stopper (12) provided on the chassis (1) to move the first base (2) upward. In addition to being urged, it is urged to rotate counterclockwise.

Further, on the chassis (1), a columnar guide pin (11) whose outer peripheral surface is accurately formed is arranged, and a spring (1
The rotation angle of the first base (2), which is rotationally biased by 4), is kept constant.

Therefore, when the height of the first base (2) is adjusted by operating the adjustment nut (15), the first base (2) is moved by the guide pin (11).
It moves up and down while making sliding contact with the rotation angle of the first base (2), that is, X.
The distance does not change.

The guide pin (11) forms a positioning body for restraining the movement of the first base (2) in the tape running direction, and the first base (2)
The guide pin (11) and the guide pin (11) form a regulation mechanism for the fixed magnetic head.

The second base (3) includes a support pin (20) projectingly provided on the first base (2), and first to third adjustment screws (4) (4) provided on the second base (3). 40) (41) and 1st base (2)
It is arranged substantially horizontally above.

As shown in FIG. 4, the support pin (20) has a sharp tip, and the tip is brought into contact with the opening edge of the small diameter hole (30) formed in the second base (3). Supports (3).

The first adjusting screw (4) is arranged on the center line of the control head, is screwed into the second base (3), and has the tip of the first adjusting screw (4).
It is applied to the base (2). Second adjustment screw (40) and third
The adjustment screws (41) are arranged on both sides of the center line of the control head, and the second adjustment screws (40) penetrate the second base (3) and are screwed to the first base (2). . Further, the third adjusting screw (41) penetrates the second base (3) and is screwed into the first base (2), and a coil spring () is formed between the second base (3) and the screw head. 42) is interposed and the second base (3) is urged downward.

The first adjustment screw (4) with the second adjustment screw (40) loosened
By operating the second base (3), the support pin (2
It swings about 0) as a fulcrum, and the front-back inclination of the control head (5) changes. By operating the second adjusting screw (40) and the third adjusting screw (41), the second base (3) swings around the support pin (20) and the first adjusting screw (4) as a fulcrum. , The left and right inclination of the control head (5) changes.

As shown in FIG. 1 and FIG. 3, the first adjusting portion is guided by the pair of guide pieces (73) (74) arranged on the chassis (1) to slide, and the traveling path of the magnetic tape (8). A slide plate (7) that moves in a direction substantially orthogonal to the slide plate (7), and an adjusting roller (6) pivotally supported by a pivot shaft (70) at the tip of the slide plate (7). To form a tape guide body.

A pair of grooves (75) (72) into which the tip end of a minus driver fits with play is formed in the opposing portions of the one guide piece (73) and the slide plate (7). Further, a long hole (71) extending in the longitudinal direction is formed in the rear portion of the slide plate (7), and a fixing screw (76) fitted in the long hole (71) is screwed into the chassis (1) to slide. The plate (7) is fixed.

The adjusting roller (6) has a tape guide (61) (6) (6) for restricting the traveling position of the magnetic tape (8) at the upper end and the lower end, respectively.
2) is included.

The position of the adjusting roller (6) is adjusted by inserting a flat-blade screwdriver into the grooves (72) and (75) with the fixing screw (76) loosened, and rotating the slide plate (7) slightly. By.

For example, as shown in FIG. 1, when the adjusting roller (6) is retracted, the distance along the magnetic tape (8) between the leading pin (52) and the control head (5) is slightly shortened, and only that much. The X distance will decrease.

When the desired X distance is obtained, the fixing screw (76) is tightened to fix the position of the adjusting roller (6), and the adjustment of the X distance is completed.

As the adjusting roller (6) moves, the traveling path of the magnetic tape (8) changes as shown in FIG. 8, and the tape winding angle with respect to the erasing head (50) changes, but the X distance is slightly reduced. Since there is a slight change in the adjustment, there is no fear that the performance of the erasing head (50) is deteriorated.

Further, as shown in FIG. 5, a tape guide (63) is provided inside the tape running path between the adjusting roller (6) and the erasing head (50) so that the tape guide (63) can be retracted and retracted. By sliding the (63) onto the magnetic tape (8), it is possible to prevent the tape winding angle from being changed due to the position adjustment of the adjusting roller (6).

According to the fixed magnetic head adjusting device, the posture of the control head (5) is adjusted by the second adjusting unit and the X distance is adjusted by the first adjusting unit in order, so that a desired setting state can be achieved with less man-hours than ever before. Is obtained.

However, as shown in FIG. 8, when adjusting the X distance, the sliding contact state between the control head (5) and the magnetic tape (8) does not change, and the recording / reproducing performance of the control head (5) is maximized. It is possible to demonstrate to the limit.

The configuration of each part of the present invention is not limited to the above embodiment, and it is needless to say that various modifications can be made within the technical scope described in the scope of claims for utility model registration.

For example, the present invention can be applied to not only the control head but also the audio head, or the magnetic head having the control head and the audio head integrally.

[Brief description of drawings]

1 is a plan view of a fixed magnetic head adjusting device according to the present invention, FIG. 2 is a front view of a second adjusting portion, FIG. 3 is a perspective view of the first adjusting portion, and FIG. 4 is a second base. FIG. 5 is a cross-sectional view showing a supporting portion, FIG. 5 is a plan view for explaining a traveling path of a magnetic tape, FIGS. 6 and 7 are a plan view and a partially cutaway front view of a conventional device, and FIG. FIG. 9 is a plan view for explaining the change of the magnetic tape running path in the apparatus, and FIG. 9 is a plan view for explaining the movement of the control head in the conventional apparatus. (2) ... First base, (3) ... Second base (4) (40) (41) ... Adjusting screw, (6) ... Adjusting roller (5) ... Control head, (7) ... Slide plate

Claims (5)

[Scope of utility model registration request] 1. A first adjusting portion for setting a tape distance along a tape running path between a main magnetic head and a fixed magnetic head to a predetermined value, and an attitude of the fixed magnetic head with respect to a magnetic tape. In a fixed magnetic head adjusting device including a second adjusting portion, the first adjusting portion arranges a tape guide body so that it can be advanced and retracted perpendicularly to the tape traveling path and can be fixed at an arbitrary position. The tape guide body,
Tape guides (61) are provided near the upper and lower edges of the tape to prevent the running position of the tape from shifting up and down.
(62) is provided, and the second adjusting portion is arranged at a position separated from the first adjusting portion on the downstream side, is prevented from moving in the tape running direction and the vertical direction, and has a height direction. A fixed magnetic head adjusting device comprising a restricting mechanism which is allowed to move and an adjusting mechanism for adjusting a height position of the restricting mechanism, wherein a fixed magnetic head is disposed in the second adjusting section. 2. A tape guide body is slidably mounted on a chassis (1) and capable of adjusting a fixed position, and is pivotally supported on the slide plate (7). The fixed magnetic head adjusting device according to claim 1, further comprising a adjusting roller (6), wherein the adjusting roller (6) is provided with tape guides (61) (62). 3. The second adjusting part includes a first base (2) having one end fitted to a main shaft (13) on the chassis (1) so as to adjust a height position, and the first base (2). The second base (3) is arranged on the base (2) so that the inclination of the front, rear, left, and right can be adjusted. The first base (2) is a positioning body on the chassis (1) and is used by the spindle. Movement in the tape running direction around the center (13) is suppressed, and a regulation mechanism is constituted by the first base (2) and the positioning body, and a fixed magnetic head is fixed on the second base (3). The fixed magnetic head adjusting device according to claim 1 or 2, which is claimed. 4. A utility model registration claim wherein the main magnetic head is a rotary magnetic head mounted on a VTR cylinder.
The fixed magnetic head adjustment device according to any one of items 1 to 3. 5. The fixed magnetic head adjusting device according to claim 4, wherein the fixed magnetic head is a control head (5) for recording or reproducing a control signal for controlling a tracking servo mechanism. .