JPH03183055A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To eliminate the need of a guide rail member and to simplify an automatic loading configuration by controlling Z-axial movement of a loading base freely ascendibly and descendibly borne by a loading ring, etc., via a cam groove. CONSTITUTION:The loading base 36 mounted with a loading guide and borne freely ascendibly and descendibly by guide shafts 32 and 34 of the loading ring 30 is turned integrally with the ring 30. In this case, the base 36 is regulated in a lower part than a lead part of a tape guide band of a rotary head 20 or in the Z-axial movement by the cam groove 22A provided on a drum base 22 for the drum 20, so that the need of a complicated guide rail member for regulating three-dimensional movement is eliminated, and the automatic loading device configuration is simplified.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic recording/reproducing device, and more particularly to a loading mechanism for winding a magnetic tape around a rotating head drum.

[Conventional technology]

In general, the loading mechanism of this type of magnetic recording and reproducing apparatus pulls out the magnetic tape from the cassette by moving a loading base on which loading guides are mounted, and winds the magnetic tape around a rotating head drum.

By the way, since the magnetic tape needs to be wound diagonally around the rotating head drum, the loading base is
It was guided by a guide rail member that regulates the position in the ySz direction.

[Problem to be solved by the invention]

However, since conventional guide rail members regulate the three-dimensional position of the loading base, the structure of the rail part becomes opaque, leading to a decrease in component precision and an increase in cost.

The present invention was made in view of these circumstances, and eliminates the guide rail member that guides the loading base.
Another object of the present invention is to provide a magnetic recording/reproducing device that can simplify the structure of a guide rail member.

[Means to solve problems]

In order to achieve the above object, the present invention provides magnetic recording in which a magnetic tape is pulled out from a cassette mounted at a predetermined position by moving a loading base on which loading guides are mounted, and the magnetic tape is wound around a rotating head drum. In the playback device, the loading base is supported by a guide shaft so as to be movable in a Z-axis direction perpendicular to an X-Y plane parallel to a plane formed by the cassette mounted at the predetermined position, and the rotating head drum is attached. The loading base is engaged with the outer circumferential surface of the drum base or the outer circumferential surface below the lead portion of the tape guide band of the rotary head drum, and the Z
The present invention is characterized in that a cam portion is formed to restrict movement in the axial direction, and the guide shaft supporting the loading base is moved within the XY plane while being positioned by a driving means.

[Effect]

According to the present invention, the loading base is movably supported in the Z-axis direction, and the position of the loading base in the Z-axis direction is controlled by the outer circumferential surface of the drum base or below the lead portion of the tape guide band of the rotating head drum. Since this is done by the cam portion formed on the outer circular surface, the guide rail member only needs to be regulated in the X-Y direction, and its structure can be simplified. Further, when a loading ring is used as the driving means, the loading ring can be disposed parallel to the XY plane and the guide rail member can be eliminated.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the magnetic recording and reproducing apparatus according to the present invention will be described in detail below with reference to the accompanying drawings.

1 and 2 are plan views of essential parts of a magnetic recording and reproducing apparatus according to the present invention, respectively, and FIG. 3 is a front view of FIG. 2.

Figure 1 shows an 8mm video cassette 1 as a tape cassette.
0 is used to illustrate the state before the cassette 10 is installed in a predetermined position and tape loading is started. In the figure, 20 is a rotating head drum, 22 is a drum base, 30 and 40 are upper and lower loading rings, and 50 is a positioning cylindrical member.

As shown in FIG. 5, the rotary head drum 20 is disposed on the base chassis 12 via the drum base 22 so that the drum axis in the Z-axis direction is perpendicular to the base chassis 12, which is parallel to the X-Y plane. It is set up. That is, the drum base 22 is formed such that the drum mounting surface and the mounting surface to the base chassis 12 are parallel to each other. Further, as shown in FIG. 5, a cam groove 22A is formed on the outer peripheral surface of the drum base 22 to regulate the position of a loading base 36, which will be described later, in the Z-axis direction.

The loading rings 30 and 40 are arranged on the base chassis 12 around the drum base 22 and parallel to the base chassis 12 as shown in FIG. That is, the loading rings 30 and 40 are
Each of them is arranged in a plane perpendicular to the drum axis of the rotary head drum 20.

Ring gears 30Al and 40A are formed on the outer FJIIS of these loading rings 30 and 40, respectively, and the ring gears 30A and 40A mesh with gears 60 and 62 as shown in FIG. 2. Also, gear 6
0 is such that a rotational driving force is transmitted from a gear 64 driven by a loading motor (not shown) through a gear 65, and a rotational driving force is transmitted from the gear 64 through gears 66 and 67 to the gear 62. It has become.

Therefore, when the gear 64 is rotationally driven in the counterclockwise direction, the loading ring 30 is rotated in the counterclockwise direction.
The loading ring 40 rotates clockwise.

On the other hand, on the upper loading ring 30, guide shafts 32, 34 are installed vertically on the ring, as shown in FIG. is inserted so as to be movable in the vertical direction. Guide rollers 37, 38 and inclined posts 39 are arranged on this loading base 36,
Further, a V-groove 36A (FIG. 1) for positioning is formed at the tip of the loading base 36.

Similarly, the lower loading ring 40 has guide shafts 42.44 installed vertically on the ring as shown in FIG. A base 46 is inserted so as to be movable in the vertical direction. On this loading base 46,
A guide roller 47 and an inclined post 48 are provided, and a V for positioning is provided at the tip of the loading base 46.
A groove 46A (FIG. 1) is formed.

The positioning cylindrical member 50 positions the loading base 36 on the drum outlet side and the loading base 46 on the drum inlet side when loading is completed, and is installed vertically on the basin palm 12 as shown in FIG. There is. This positioning cylindrical member 50 is made up of a column 52 having a threaded portion 52A, and nuts 54 and 56 which are screwed into the threaded portion 52A of the column 52 and can be finely adjusted in the vertical direction.

When the loading is completed, the Vil 136A of the loading base 36 comes into contact with the cylindrical part 52B of the support 52, so that the tip of the loading base 36
- Positioning on the Y plane is performed, and similarly, the V groove 46A of the loading base 46 comes into contact with the cylindrical portion 56A of the nut 56, thereby positioning the tip of the loading base 46 on the xY plane. .

Also, when loading is completed, loading base 3
The tip of the loading base 46 is pushed down by a small amount by the lower surface 54A of the nut 54, thereby positioning the loading base 46 in the Z-axis direction.
The upper surface 54B of the nut 56 pushes the nut 56 upward by a small amount, thereby positioning it in the Z-axis direction.

Next, a loading operation by the magnetic recording/reproducing apparatus having the above configuration will be explained.

FIG. 1 shows the state in which the cassette 10 is installed in a predetermined position and before tape loading is started.

In this state, the guide roller 37. on the loading ring 30.40. 38.47, guides that should be located inside the tape such as the inclined post 39.48, the left and right twisting bins at the tape entrance/exit of the cassette IO, the pinch rollers (not shown), etc., are all located inside the mouth part 10A of the cassette IO. It is located in

Here, after the tape path at the tape entrance/exit of the cassette 10 is formed by the left and right swing bins, when the gear 64 is rotated counterclockwise, the loading ring 30 is rotated counterclockwise as shown in FIG. The loading ring 40 rotates clockwise.

As a result, the loading base 36 on which the guide rollers 37 and the like are mounted rotates as the loading ring 30 rotates, and moves toward the bottom of the rotary head drum 20. That is, as shown in FIGS. 5 to 7, the loading base 36 is provided with a cam follower (not shown) that engages with the cam groove 22A formed on the outer peripheral surface of the drum base 22. When the loading ring 30 rotates, the loading base 36, which is disposed so as to be movable in the vertical direction (Z-axis direction) with respect to the loading ring 30, changes its position in the Z-axis direction by the cam groove 22A of the drum base 22. It is regulated and moves vertically (see Figures 6 and 7).

Similarly, the loading base 46 on which the guide rollers 47 and the like are mounted rotates as the loading ring 30 rotates, and moves toward the upper side of the rotary head drum 20. The upward movement of the loading base 46 is performed in the same manner as described above by means of a cam groove (not shown) formed on the drum base 22 and a cam follower disposed on the loading base 46. Further, the amount of upward movement of the loading base 46 is smaller than the amount of downward movement of the loading base 36.

In this way, when the loading rings 30 and 40 rotate counterclockwise and clockwise, respectively,
The magnetic tape in the cassette 10 is pulled out from the loading bases 36 and 46 by idle rollers 37 and 47, respectively, and is wound obliquely onto the rotating hept drum 20.

Then, when the loading rings 30 and 40 are rotated to the positions shown in FIG. Magnetic recording/reproduction becomes possible on the wound magnetic tape.

On the other hand, unloading can be performed by rotating the gear 64 in a clockwise direction and rotating the loading rings 30, 40 in the opposite direction to the above case.

In this embodiment, the cam groove that regulates the position of the loading base in the 2M direction is formed on the outer circumferential surface of the drum base, but the cam groove is not limited to this. A cam portion may be formed on the lower outer peripheral surface. In addition, as a driving means for moving the guide shaft that supports the loading base,
Not limited to the loading ring of this example, the guide shaft can be
- A guide rail member may be used to regulate the position within the Y plane.

〔Effect of the invention〕

As explained above, according to the magnetic recording and reproducing device according to the present invention, the position of the loading base in the Z-axis direction is regulated by the cam portion formed on the outer peripheral surface of the drum base or the rotary head drum. When moving using a guide rail member, positional regulation in the Z-axis direction by the guide rail member is unnecessary, and the structure of the guide rail member can be simplified. In addition, when moving the loading base using a loading ring, the position within the XY plane can be regulated by the loading ring arranged parallel to the XY plane, thereby making it possible to eliminate the guide rail member. .

[Brief explanation of drawings]

1 and 2 are plan views of main parts showing one embodiment of the magnetic recording/reproducing device according to the present invention, FIG. 3 is a front view of FIG. 2, and FIG. 4 is a positioning diagram shown in FIG. 3. 5 is a side view of the rotating drum and drum base of the magnetic recording/reproducing device shown in FIGS. 1 and 2, and FIGS. 6 and 7 are loading views, respectively. FIG. 6 is a diagram used to explain movement of the base in the Z-axis direction. 10... Cassette, 12... Base chassis,
20...Rotating head drum, 22...Drum base, 22A...Cam groove, 30.40...Loading ring, 32.34.42.44...Guide shaft, 36.46... Loading base, 3
6A, 46A...V1! , 37.38.47...
・Guide roller, 39.48... Inclined post, 5
0... Cylindrical member for positioning.

Claims (1)

[Claims] A magnetic recording and reproducing device in which a magnetic tape is pulled out from a cassette mounted at a predetermined position by moving a loading base on which a loading guide is mounted, and the magnetic tape is wound around a rotating head drum. The base is supported by a guide shaft so as to be movable in a Z-axis direction perpendicular to an X-Y plane parallel to a plane formed by the cassette mounted at the predetermined position, and the outer peripheral surface of the drum base to which the rotary head drum is attached or A cam portion is formed on the outer circumferential surface below the lead portion of the tape guide band of the rotary head drum to engage with the loading base and restrict movement of the loading base in the Z-axis direction, and a guide supports the loading base. A magnetic recording/reproducing device, characterized in that the shaft is moved by regulating its position within the X-Y plane by a driving means.