JPH0413778Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tape guide block fixedly disposed close to a tilted drum in a magnetic recording/reproducing device having a tilted drum, and more particularly to a tape guide block having an erasing head.

Prior Art and its Problems Digital audio tape (DAT) employs an overwrite recording method that does not require an erasing head. In order to minimize the error rate when using a DAT recording/playback device as a computer backup device,
Before making a new recording to the DAT, it is required to completely erase the already recorded signal. Therefore, it is desirable to provide an erasing head in the DAT recording/reproducing device.

In conventional video tape recorders, the tape is pulled out and wound around the drum by a pair of movable pull-out members each having an inclined pin and a vertical pin, and the erasing head is moved to the pull-out member upstream of the drum. Some are installed further upstream. The reason for this is that at the upstream position of the drawer member, the tape surface is perpendicular to the reference plane (for example, the chassis surface), and it is easy to set the erasing head at an appropriate position with respect to the tape surface. It is.

However, when the erasing head is installed in the above position, the distance between the erasing head and the drum (recording/reproducing head) becomes longer, and when continuous recording is performed, there are many sections that are not erased by the erasing head. There are drawbacks.

On the other hand, if the erasing head is fixedly arranged on the chassis surface between the pull-out means having only vertical pins and the drum (for example, see Japanese Patent Application Laid-open No. 167157/1982),
Although the problems in splicing recording are alleviated, it is difficult to precisely tilt and position the tape contacting surface of the erasing head (accurate setting of the tilt angle with respect to the reference plane and the orientation of the plane that includes the tilt angle). , accuracy of the stop position of the vertical pin in the withdrawn position relative to the erase head is required.

Furthermore, one solution is to fix the erasing head on the chassis surface between the inclined pin and the vertical pin of the movable pull-out member, but in this case,
Since the wrap angle with respect to the tilting pin is defined by the relative position of the erasing head and the drawer member, and the two members move relative to each other, a high degree of positional accuracy is required with respect to each other.

In addition, a magnetic head that doubles as a tape guide is installed on a concave guiding surface that is compatible with the tape so that the magnetic pole operating surface (tape contact surface) of the magnetic head is flush with the concave guiding surface.
21425) and a magnetic head has been proposed in which a notch is provided in the sliding area of the tape surface of a component of a tape running system, and the magnetic head is integrally incorporated into this notch (for example, Publication No. 55-8638). Although these magnetic heads can be used as a tape guide/erasing head fixedly arranged on the reference plane, a vertical pin/erasing head on a movable pull-out member, or a tilted pin/erasing head, they cannot be arranged perpendicularly to the reference plane. If applied to the vertical pin of the drawer member, the distance between the tape guide and erase head and the drum will be somewhat larger, as mentioned above. is shorter, but
However, it still has the drawbacks of a movable pull-out means having a vertical pin and an inclined pin, and when applied to the inclined pin of a pull-out member, strict positional accuracy is required in the pull-out position of the tape guide/erasing head. .

In addition, in a magnetic recording/reproducing device in which a magnetic tape is wound around an inclined cylinder by a pair of movable pull-out means, each of the movable pull-out means is provided with only pull-out pins oriented perpendicularly, and the magnetic tape is tilted with respect to the reference plane. a first tape guide block which is arranged closest to the drum; and a first tape guide block which is inclined with respect to the reference plane and which is arranged further away from the inclined cylinder than the first tape guide block guide part. and a third tape surface guide section oriented perpendicularly to the reference plane and disposed further away from the inclined cylinder than the second tape surface guide section. The arrangement of a tape guide block having a tape guide block in close proximity to an inclined cylinder, and the tape guide block therefor, are disclosed in the applicant's earlier application (U.S. Pat.
Nos. 17544 to 17546). In the above-mentioned application, if the erasing head is not integrated into the tape guide block and the erasing head is provided separately, the same disadvantages as mentioned above arise.

Means for Solving the Problems In the present invention, in a tape guide block that is fixedly disposed close to the drum, a first tape surface guide portion that is inclined with respect to the reference plane and disposed close to the drum; a second tape surface guide section that is inclined with respect to the plane and is arranged upstream of the first tape surface guide section in the tape running direction; and oriented perpendicularly to the reference plane;
and an erasing head disposed upstream of the second tape surface guide section.

In a preferred embodiment, edge regulating means for restricting movement of the edge of the tape in the width direction of the tape is provided, and the gap length of the erasing head is equal to the displacement width in the width direction of the tape regulated by the edge regulating means. It extends beyond.

Action/effect The functions and effects of the present invention are as follows.

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

(2) Since the tape guide block and the erasing head are integrally formed, the number of man-hours required to attach the parts to the magnetic recording/reproducing device is reduced.

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

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

(5) Since the gap length of the erasing head is longer than the movement range in the tape 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 schematically showing a tape running path in a magnetic recording/reproducing device incorporating the present invention.
2 is an enlarged front view of the tape guide block according to the present invention, FIG. 3 is a plan view of the tape guide block of FIG. 2, FIG. 4 is a bottom view of the tape guide block of FIG. 2, and FIG. 5 is a bottom view of the tape guide block of FIG. 2 is a left side view of the tape guide block, and FIG. 6 is a sectional view taken along line A--A in FIG. 2. However, in FIGS. 3 to 6, a part of the tape guide block shown in FIG. 2 is omitted to simplify the drawings.

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

The drum 6 is equipped with a rotating head (not shown).
The central axis is inclined with respect to the reference plane 5 by a predetermined angle.

The pair of tape pull-out means 7 and 8 move along a moving path indicated by a broken line between two positions, an unloading position indicated by a dotted line and a loading position indicated by a solid line in FIG. It is now possible to move along. withdrawal means 7,
8 each have a pull-out pin 7a, 8a oriented perpendicularly to the reference plane 5 during their movement and in the two positions mentioned above. Pull-out pins 7a, 8 in unloading position
A is positioned at a distance from the magnetic tape 4 on the back (base) side of the magnetic tape 4 which is stretched between the guides 3a and 3b of the cassette 3. The pull-out pins 7a and 8a in the loading position contact the back side of the magnetic tape, pull out the tape, and wind the magnetic tape around the drum 6.

The pair of tape guide blocks G1 and G2 are attached to the magnetic surface (surface) of the magnetic tape 4 that is stretched between the pair of tape pull-out means 7 and 8 and the drum 6 when they are in the loading position. They are fixedly arranged close to and on both sides of the drum 6 so as to be in contact with it. Each of the tape guide blocks G1 and G2 is shown as having a block body 20, an edge regulating member 30 removably attached to the block body, and a mounting means 40 for mounting the tape guide block on, for example, a chassis. There is.

FIG. 2 shows a front view of the tape guide block G1 according to the present invention, and 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 body 20 and the edge regulating means 30 are shown, and the mounting means 40 is omitted.

First and second tape surface guide portions 21 and 22 are integrally formed on the block body 20 along the magnetic tape guide path. The first tape surface guide section 21 is inclined with respect to the reference surface 5 and is located close to the drum 6 when the tape guide block G1 is attached to the reference surface 5.
The tape surface guide section 22 is inclined with respect to the reference surface 5 and is located upstream of the first tape surface guide section 21 in the tape running direction.

The edge regulating member 30 includes a head portion having an edge regulating surface 31 and a cylindrical leg portion 32 extending from the head portion.
and has. The block body 20 includes a leg portion 32 for slidably receiving the edge regulating member.
A through hole 24 is provided that 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, and a reduced diameter portion 25 is provided adjacent to the lower end of the through hole 24. is formed. From the head of the edge regulating member 30 to the leg 3
A through hole 33 is formed extending over 2, into which a mounting pin 41 of the mounting means is received. A sliding surface 36 is formed on the back surface of the head of the edge regulating member 30 so as to be in slidable contact with the guide surface 28 provided on the block body 20 to determine the direction in which the edge regulating surface 31 extends.

The attachment means 40 includes one end 42 that is threaded.
, a mounting pin 41 having a flange 43 close to the other end, and a bolt 4 screwed into the threaded end.
4. The mounting pin 41 is attached to the block body 2.
It is inserted from below into the through hole 24 of No. 0. The threaded end 42 of the mounting pin 41 passes through the through hole 33 of the edge regulating member 30 inserted from above the block body 20, and penetrates above the head of the edge regulating member. A compression coil spring 45 is disposed between the lower end of the leg portion 32 and the upper surface of the reduced diameter portion 25. Threaded end 4 of mounting pin 41
The bolt 44 screwed into the block body 2 presses the head of the edge regulating member 30 downward against the biasing force of the coil spring 45, and the assembly of the edge regulating member 30 to the block body 20 is completed. At this time, the lower end 46 of the mounting pin 41 extends from the bottom surface of the block body 20, and is press-fitted into a mounting hole (not shown) provided in the chassis. A recess 26 is formed in the bottom surface of the block body 20 adjacent to the opening of the through hole 24, and this recess 26 receives a projection (not shown) provided on the chassis.
Fitting of mounting pin 41 and through hole 24 and recess 26
By fitting the tape guide block G1 with the protrusion, the tape guide block G1 is uniquely positioned and fixed to the chassis.

Fixedly arranged tape guide blocks G1, G
The edge regulating surface 31 in 2 protrudes from the block main body 20 beyond the guide surface defined by the first and second tape surface guide sections 21 and 22, and connects to the chassis surface (reference surface 5) across the guide surface. ) to face. By operating the bolt 44, the distance between the edge regulating surface 31 and the chassis surface can be adjusted. The structure of the tape guide block described above is substantially the same as that described in the applicant's earlier application (Utility Application No. 169939/1982). Further, a concave escape portion 61 having substantially the same curvature as 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 placed close to the drum 6.

In the present invention, an erasing head 50 is provided upstream of the second tape surface guide portion 22 of the tape guide block G1 disposed upstream of the drum 6. Specifically, the erase head 50 is
As shown in FIG. 6, two C-shaped cores 51, 52
It is formed by abutting against each other, and is integrally attached to the block main body 20 having the first and second tape surface guide parts by adhesive, so that the tape contact surface is perpendicular to the reference surface 5. It forms a tape surface guide section. The gap 27 provided on the tape contact surface has a length equal to that of the edge regulating member 3.
It is formed beyond the widthwise displacement range of the edge of the magnetic tape 4 regulated by 0, and records are erased over the entire width of the magnetic tape regardless of the displacement of the magnetic tape 4. The ends of a pair of turns of coil 29 of erase head 50 are connected to suitable terminals (not shown).
connected to the electrical circuit via.

Thus, when the pull-out members 7, 8 move from the unloading position to the loading position, the pull-out pins 7a, 8a contact the back surface of the magnetic tape 4 and move the magnetic tape 4 toward the drum 6. Pull out. Pull-out pin 7a,
8a is stopped at a predetermined position by 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 biasing means 12 such as a spring, etc.
A tension pole 14 provided on an arm 13 biased by a tension pole 14, a guide pin 15 fixed to the chassis, a capstan 16 provided at a fixed position on the chassis, a movable pinch roller 17, and a movable guide roller 18. It is shown. Drawer members 7, 8
In response to the movement from the unloading position to the loading position, the guide roller 1
1, 18 and the pinch roller 17 move from an unloading position shown by a dotted line to a loading position shown by a solid line through a movement path shown by a broken line. Therefore, at the loading position, the magnetic tape 4 unwound from the reel 1 passes through the guide roller 11, the fixed guide pin 15, and the pull-out pin 7a, and is wound around the drum 6 at an angle of about 90 degrees. Ru. drum 6
The magnetic tape 4 that has come out is wound onto the reel 2 through a capstan 16 and a guide roller 18, which work together with a pull-out pin 8a and a pinch roller 17 to transport the magnetic tape 4. magnetic tape 4
Tension pole 1 gives appropriate tension to
4. The mechanism itself for driving the movable guide roller and pinch roller is well known and will not be described in detail.

Also, in this loading position,
As shown in FIG. 6, the erasing head 50 is located between the second tape surface guide portion 22 and the pull-out pin 7a, and its tape contacting surface is oriented perpendicularly to the reference surface 5. Therefore, magnetic tape 4
As long as the tape is in contact with this tape contacting 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.

One embodiment of the present invention has been described in detail above.
The present invention is not limited to the above-mentioned embodiments, and without departing from the technical idea of the present invention,
Various modifications are possible.

For example, the edge regulating means 30 may be integrally molded with the block body 20. Furthermore, the erasing head 50 may be positioned on the block body through a suitable means, such as a casing, and fixed by, for example, screws, instead of adhesively. The winding end of the erasing head coil may be connected to a terminal provided on the bottom of the block body, and automatically connected to an electric circuit when the tape guide block G1 is attached to the chassis.

[Brief explanation of drawings]

Fig. 1 is a plan view schematically showing a tape loading device in a magnetic recording/reproducing device incorporating the present invention, Fig. 2 is an enlarged front view of the tape guide block of the present invention, and Fig. 3 is the tape guide of Fig. 2. 4 is a bottom view of the tape guide block in FIG. 2, FIG. 5 is a left side view of the tape guide block in FIG. 2, and FIG. 6 is a view taken along line A-A in FIG. 2. FIG. However, in FIGS. 3 to 6, a part of the tape guide block shown in FIG. 2 is omitted to simplify the drawings. Explanation of symbols: G1... Tape guide block disposed on the upstream side of the inclined drum, 20... Block main body, 21... First tape surface guide portion, 22
... second tape surface guide section, 24 ... through hole,
25... Reduced diameter portion, 26... Concave portion, 27... Erasing head gap, 28... Guide surface, 29... Coil, 30... Edge regulating member, 31... Edge regulating surface, 32... Leg portion , 33... through hole, 36...
Sliding surface, 40... mounting means, 41... mounting pin,
42... Threaded end portion, 43... Flange portion,
44... Bolt, 45... Compression coil spring, 46... Lower end of mounting pin, 50... Erasing head, 51, 52... C-shaped core, 61... Relief portion.

Claims (1)

[Scope of utility model registration request] a tape guide block that is fixedly disposed close to the drum, and includes a first tape surface guide section that is inclined with respect to the reference plane and disposed close to the drum;
a second tape surface guide section disposed upstream of the tape surface guide section in the tape running direction; and a second tape surface guide section oriented perpendicularly to the reference plane;
A tape guide block further comprising an erasing head disposed upstream of the second tape surface guide section.