JPH0743810B2 - Magnetic recording / reproducing device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention generally relates to a magnetic recording / reproducing apparatus, and in particular, when a recording / reproducing apparatus for a digital audio tape (DAT) is used as a backup device for a computer, it is a DA.
The present invention relates to a magnetic recording / reproducing device capable of erasing an already recorded signal prior to new recording on T.

Prior Art and Its Problems DAT employs an overwrite recording method that does not require an erasing head. When using the DAT recording / playback device as a backup device for a computer,
In order to minimize the error rate, it is required to completely erase the already recorded signal prior to new recording on the DAT. Therefore, it is desirable to provide the DAT recording / reproducing apparatus with an erasing head.

In a conventional video tape recorder, a tape is pulled out by a pair of pull-out members each having an inclined focus and a vertical pin and wound around a drum, and an erasing head is provided on the upstream side of the pull-out member on the upstream side of the drum. There is one provided. The reason is that the tape surface is perpendicular to the reference surface (for example, the chassis surface) at the above position, and it is easy to install the erasing head at an appropriate position with respect to the tape surface.

However, when the erasing head is installed at the above-mentioned position, the distance between the erasing head and the drum (recording / reproducing head) becomes long, and in the case of joint recording, there is a drawback that there are many sections that are not erased by the erasing head. is there.

On the other hand, if the erasing head is fixedly arranged on the chassis surface between the drawing means having only the vertical pin and the drum (for example, Japanese Patent Laid-Open No. 167157/1985), the problem in continuous recording can be alleviated, but the erasing head It is difficult to position the tape contact surface of the tape with a precise inclination (precision setting of the inclination angle with respect to the reference surface and the orientation of the surface including the inclination angle), and the vertical pin stop position at the pulling position with respect to the erasing head The accuracy of is required.

Further, it is also one measure to fix the erasing head on the chassis surface between the inclined pin and the vertical pin in the movable drawer member, but in this case, the wrap angle with respect to the inclined pin is the relative position between the erasing head and the drawer member. Since these two members move relative to each other, high positional accuracy of each other is required.

In addition, a magnetic head which is also used as a tape guide by mounting the magnetic pole working surface (tape contact surface) of the magnetic head on the concave guiding surface compatible with the tape as the same surface as the concave guiding surface (Jitsuko Sho 35-21425). (Japanese Patent Laid-Open Publication No. 2004-242242) and a magnetic head in which a notch portion is provided in a sliding area of a tape surface of a component of a tape traveling system, and a magnetic head is integrally incorporated in the notch portion (for example, Japanese Patent Laid-Open No. 2000-242242). Akira
55-8638). These magnetic heads can be used as a tape guide / erasing head fixedly arranged on the reference plane or as a vertical pin / erasing head or an inclined pin / erasing head in a movable drawing member, but fixedly arranged vertically to the reference plane. In the case of (on the upstream side of the drawing member), the distance between the tape guide / erasure head and the drum becomes large as described above, and when applied to the vertical pin of the drawing member, the erasing head and the drum. The distance between and is somewhat shorter, but it still contains the drawbacks of the movable drawer means with vertical and tilt pins, and when applied to the tilt pin of the drawer member,
Strict positional accuracy in the pull-out position of the tape guide / erasing head is required.

Further, in a magnetic recording / reproducing apparatus of a type in which a magnetic tape is wound around an inclined drum by a pair of movable drawing means, each of the movable drawing means is provided with only a drawing pin oriented vertically and is inclined with respect to a reference plane. A first tape surface guide portion that is arranged closest to the drum and a second tape surface guide portion that is inclined with respect to the reference surface and that is arranged farther from the inclined cylinder than the first tape surface guide portion. A tape guide block having a tape surface guide portion and a third tape surface guide portion which is oriented perpendicular to the reference surface and is arranged further away from the inclined drum than the second tape surface guide portion. Is arranged in the vicinity of the inclined drum, and the tape guide block therefor is described in the previous application of the applicant (Japanese Patent Application No. 62-17544 and Japanese Patent Application No. 62-17546). It has been mounting. In the above-mentioned application, when the erasing head is not incorporated in the tape guide block and the erasing head is provided separately, the same drawbacks as described above occur.

Means for Solving the Problems In the present invention, when a drum inclined with respect to a reference surface, a tape guide block fixedly arranged close to each of the upstream side and the downstream side of the inclined drum, and a tape cassette are loaded. , A pair of vertical pins positioned on the back side of the tape that is hung between the pair of tape reels are moved to both sides of the pair of tape guide blocks at the time of recording or reproducing to make the magnetic surface of the tape pair. In the magnetic recording / reproducing apparatus including at least a tape guide block for contacting the tape guide block and the drum, the tape guide block arranged on the upstream side of the drum is inclined with respect to the reference plane, and A first tape surface guide portion that is arranged in close proximity to the first tape surface, and the first tape that is inclined with respect to the reference surface. A second tape surface guide portion arranged upstream of the guide portion in the tape running direction, and a tape contact surface of the second tape surface guide portion is oriented perpendicular to the reference surface, and the second tape surface guide. The erasing head is arranged further upstream than the part.

Action / Effect The action / effect of the present invention is as follows.

(1) Since the erasing head is provided on the tape guide block which is fixedly arranged close to the inclined drum, the section which is not erased by the erasing head is reduced when the continuous recording is performed.

(2) Since the tape guide block and the erasing head are integrally formed, the number of man-hours for mounting the components on the magnetic recording / reproducing apparatus is reduced.

(3) Since the tape sliding surface of the erasing head is perpendicular to the reference surface, it is easy to mount the erasing head integrally and accurately on the tape guide block.

(4) Since the erasing head is used as the third tape surface guide portion that is perpendicular to the reference surface, high positional accuracy is not required at the pull-out position of the pull-out pin.

(5) Since the gap length of the erasing head is longer than the moving range of the tape in the width direction by the edge regulating means, the previous recording can be completely erased even if the tape is displaced in the width direction.

Embodiment FIG. 1 is a plan view showing the outline of a magnetic recording / reproducing apparatus according to the present invention, FIG. 2 is an enlarged front view of a tape guide block in FIG. 1, and FIG. 3 is a plan view of the tape guide block in FIG. 4, FIG. 4 is a bottom view of the tape guide block of FIG. 2, FIG. 5 is a left side view of the tape guide block of FIG. 2, and FIG. 6 is a sectional view taken along the line AA of FIG. is there.
However, in FIGS. 3 to 6, a part of the tape guide block shown in FIG. 2 is omitted for simplification of the drawings.

In the embodiment shown in FIG. 1, the pair of tape reels 1 and 2 are shown as provided in the cassette 3. When the cassette 3 is loaded in the magnetic recording / reproducing apparatus, the magnetic tape 4 is guided by the guides 3a, 3b provided on the cassette.
Holds the tape surface and the tape edge of the magnetic tape 4 perpendicular and parallel to the reference surface 5 such as the chassis surface or the mounting surface of the tape guide block along the path indicated by the dotted line.

The drum 6 equipped with a rotary head (not shown) has a reference surface 5
With respect to, the central axis is inclined at a predetermined angle.

The pair of tape pulling-out means 7 and 8 can be moved along the movement path shown by the broken line between two positions of the unloading position shown by the dotted line and the loading position shown by the solid line in FIG. It has become.
Each of the drawing means 7,8 has a drawing pin 7a, 8a which is oriented perpendicular to the reference plane 5 during their movement and in the two positions mentioned above. The pull-out pins 7a and 8a in the unloading position are positioned apart from the magnetic tape 4 on the back surface (base surface) side of the magnetic tape 4 that is stretched between the guides 3a and 3b of the cassette 3. The pull-out pins 7a and 8a in the loading position come into contact with the back surface of the magnetic tape to pull out the tape and wind the magnetic tape 4 around the drum 6. The mechanism itself for moving the tape pull-out means 7, 8 may be the same as the mechanism of the conventional pull-out member. Therefore, its mechanism will not be described in detail.

The pair of tape guide blocks G1 and G2 come into contact with the magnetic surface (front surface) of the magnetic tape 4 suspended between the pair of tape pull-out means 7 and 8 and the drum 6 when the pair of tape pull-out means 7 and 8 is in the loading position. Thus, it is fixedly arranged on both sides of the drum 6 in the vicinity thereof. Each of the tape guide blocks G1 and G2 is shown as having a block body 20, an edge regulating member 30 detachably attached to the block body, and an attaching means 40 for attaching the tape guide block to, for example, a chassis. There is.

FIG. 2 shows a front view of the tape guide block G1. Since the basic structure of the tape guide block G2 is the same as that of G1, the tape guide block G1 will be described in detail below.

Further, in FIGS. 3 to 6, only the block main body 20 and the edge regulating means 30 are shown, and the mounting means 40 is omitted.

The block body 20 includes the first and second tape surface guide portions 21, 2
2 is integrally formed along the magnetic tape guide path. The first tape surface guide portion 21 is inclined with respect to the reference surface 5 and is positioned close to the drum 6 when the tape guide block G1 is mounted on the reference surface 5, and the second tape surface guide portion 22 is provided. Is inclined with respect to the reference surface 5 and is located upstream of the first tape surface guide portion 21 in the tape running direction.

The edge regulating member 30 has a head having an edge regulating surface 31,
And a columnar leg portion 32 extending therefrom. The block body 20 extends from the top surface of the block body (the surface located above when the tape guide block is mounted on the chassis) toward the bottom surface in order to slidably receive the leg portions 32 of the edge regulating member. Through hole 24 is provided,
A reduced diameter portion 25 is formed near the lower end. A through hole extending from the head of the edge regulating member 30 to the leg 32
33 is formed in which the mounting pin 41 of the mounting means is received. A sliding contact surface 36 that slidably contacts the guide surface 28 provided on the block body 20 and determines the protruding direction of the edge restriction surface 31 is formed on the back surface of the head of the edge restriction member 30.

The mounting means 40 has a threaded one end 42, a mounting pin 41 having a flange close to the other end, and a bolt 44 screwed onto the threaded end. The mounting pin 41 is inserted from below the through hole 24 of the block body 20. Mounting pin 41
The threaded end portion 42 passes through the through hole 33 of the edge regulating member 30 inserted from above the block body 20, and penetrates above the head portion of the edge regulating member. A compression coil spring 45 is arranged between the lower end of the leg portion 32 and the upper surface of the reduced diameter portion 25. The bolt 44 screwed into the threaded end 42 of the mounting pin 41 pushes the head of the edge regulating member 30 downward against the biasing force of the coil spring 45, and the block body of the edge regulating member 30. Assembly to 20 is completed.
At this time, the lower end portion 46 of the mounting pin 41 extends from the bottom surface of the broll body 20, and it is press-fitted into a mounting hole (not shown) provided in the chassis. One concave portion 26 is formed on the bottom surface of the block body 20 in the vicinity of the opening of the through hole 24, and the concave portion 26 receives a projection (not shown) provided on the chassis. Fitting between mounting pin 41 and through hole 24 and recess 26
The tape guide block G1 is uniquely positioned and fixed to the chassis by the fitting of the projection and the projection.

The edge regulating surface 31 of the fixedly arranged tape guide blocks G1 and G2 has the first and second tape surface guide portions 21 and 22.
Overhangs from the block body 20 beyond the guide surface defined by, and faces the chassis surface (reference surface 5) across the guide surface. By operating the bolt 44, the distance between the edge regulating surface 31 and the chassis surface can be adjusted. The structure of the above-mentioned tape guide block is substantially the same as that described in the applicant's previous application (Japanese Utility Model Application No. 62-169939).

Further, a concave escape portion 61 having a curvature substantially the same as the curvature of the drum 6 is formed on the back surface of the tape guide block G1 facing the drum 6, so that the tape guide block G1 can be arranged close to the drum 6.

In the present invention, an erasing head 50 is provided on the upstream side of the second tape surface guide portion 22 of the tape guide block G1 arranged on the upstream side of the drum 6. In detail,
The erasing head 50 has two C-shaped cores as shown in FIG.
It is formed by abutting 51, 52 and is integrally attached to the block main body 20 having the first and second tape surface guide portions by adhesion, and the tape contact surface thereof is
A tape surface guide portion that is perpendicular to the reference surface 5 is formed. The gap 27 provided on the tape-facing surface is formed such that its length exceeds the range of displacement of the edge of the magnetic tape 4 in the width direction by the edge regulating member 30, and regardless of the displacement of the magnetic tape 4, Erases the record across the width of the magnetic tape. The pair of winding ends of the coil 29 of the erasing head 50 are connected to an electric circuit through appropriate terminals (not shown).

Thus, when the pull-out members 7, 8 move from the unloading position toward the loading position, the pull-out pins 7a, 8a come into contact with the back surface of the magnetic tape 4 and pull out the magnetic tape 4 toward the drum 6. The pull-out pins 7a and 8a are stopped at predetermined positions by the positioning means 9 and 10, and the magnetic tape 4 is wound around the tape guide block G1, the drum 6, and the tape guide block G2.
Referring to FIG. 1, a movable guide roller 11, a tension pole 14 provided on an arm 13 biased by a biasing means 12 such as a spring, a guide pin fixed to a chassis.
15, a capstan 16 provided at a fixed position on the chassis, a movable pinch roller 17, and a movable guide roller 18 are shown. In response to the movement of the pull-out members 7, 8 from the unloading position to the loading position, the guide rollers 11, 18 and the pinch roller 17 move from the unloading position shown by the dotted line to the loading position shown by the solid line by the broken line. Move through the movement route indicated by. Therefore, at the loading position, the magnetic tape 4 unwound from the reel is
It is wound around the drum 6 through the fixed guide roller 15 and the pull-out pin 7a at an angle of about 90 degrees. The magnetic tape 4 ejected from the drum 6 is a pull-out pin 8a, a pinch roller.
Capstan 16, which cooperates with 17 to transport magnetic tape 4,
It is wound around the reel 2 through the guide roller 18. A mechanism itself for driving the tension pole 14 for giving an appropriate tension to the magnetic tape 4, the movable guide roller, and the pinch roller is well known and will not be described in detail.

Further, in this loading position, as shown in FIG. 6, the erasing head 50 has the second tape surface guide portion.
It is located between 22 and the pull-out pin 7a, and its tape contact surface is oriented perpendicular to the reference surface 5. Therefore, as long as the magnetic tape 4 is in contact with this tape contact surface, the winding angle with respect to the second tape surface guide portion 22 is not affected by the positional accuracy of the pull-out pin 7a.

Although one embodiment of the present invention has been described in detail above, the present invention is not limited to the above embodiment, and various modifications can be made without departing from the technical idea of the present invention.

For example, the edge regulation means 30 may be molded integrally with the block body 20. Further, the erasing head 50 may be positioned on the block main body through an appropriate means, for example, a casing, and may be fixed by, for example, a spigot stopper or the like, instead of being bonded. The winding end of the coil of the erasing head may be connected to a terminal provided on the bottom surface of the block body, and may be automatically connected to an electric circuit when the tape guide block G1 is attached to the chassis.

[Brief description of drawings]

1 is a plan view showing an outline of a magnetic recording / reproducing apparatus according to the present invention, FIG. 2 is an enlarged front view of a tape guide block G1 in FIG. 1, and FIG. 3 is a plan view of the tape guide block in FIG. 4 is a bottom view of the tape guide block of FIG. 2, FIG. 5 is a left side view of the tape guide block of FIG. 2, and FIG. 6 is a sectional view taken along the line AA of FIG. . However, in FIGS. 3 to 6, a part of the tape guide block shown in FIG. 2 is omitted for simplification of the drawings. Explanation of symbols 1,2: Tape reel, 3: Cassette, 4: Magnetic tape, 5: Reference plane, 6: Inclined drum, 7,8: Drawing means, 7a, 8a: Vertical drawing pin, G1: Upstream side Tape guide block, G2: Downstream tape guide block, 20: Block body, 21: First tape surface guide section, 22: Second tape surface guide section, 2
4: Through hole, 25: Reduced diameter portion, 26: Recessed portion, 27: Erase head gap, 28: Guide surface, 29: Coil, 30: Edge regulating member, 31:
Edge regulation surface, 32: leg portion, 33: through hole, 36: sliding contact surface, 40: mounting means, 41: mounting pin, 42: threaded one end portion, 43:
Collar part, 44: Bolt, 45: Compression coil spring, 46: Lower end part, 50: Erase head, 51, 52: C type core, 61: Relief part

Claims (1)

[Claims] 1. A drum inclined with respect to a reference plane, a tape guide block fixedly arranged in proximity to each of the upstream side and the downstream side of the inclined drum, and between a pair of tape reels when a tape cassette is loaded. A pair of vertical pins positioned on the back side of the tape that has been swung over the tape are moved to both sides of the pair of tape guide blocks during recording or reproduction, and the magnetic surface of the tape is moved to the pair of tape guide blocks and the drum. In a magnetic recording / reproducing apparatus including at least a pair of tape pull-out means for making contact with the tape, the tape guide block arranged on the upstream side of the drum is arranged to be inclined with respect to the reference plane and close to the drum. The first tape surface guide portion, which is inclined with respect to the reference surface, and is closer to the tape running direction than the first tape surface guide portion. A second tape surface guide portion disposed upstream, and a tape contact surface of the second tape surface guide portion oriented perpendicular to the reference surface, and arranged further upstream of the second tape surface guide portion. A magnetic recording / reproducing apparatus having an erasing head.