JP3389950B2 - Tape tension mechanism for reverse rotation of magnetic tape unit - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reversing tape of a magnetic tape device for applying tension to the magnetic tape in a reverse reproduction mode and a reverse fast forward mode in a magnetic tape device for recording, reproducing or erasing on a magnetic tape. Regarding the tension mechanism.

[0002]

2. Description of the Related Art Conventionally, as a technique of a tape tension mechanism for reverse rotation of a magnetic tape device, there is one described in Japanese Utility Model Publication No. 8-10864, and an example thereof will be described with reference to FIGS. Shows the reverse playback mode, and FIG.
Indicates a reproduction mode, in which a chassis 2 for mounting the tape cassette 1 is provided with a mode switching mechanism 3 and a reverse tape tension mechanism 4.

The tape cassette 1 includes a supply reel 1a and a take-up reel 1b which are detachably engaged with a supply reel base and a take-up reel base on a chassis 2, and a pair of left and right rotatably provided at both ends of the opening. Guide rolls 1c, 1
Both ends of a magnetic tape t, which has d and is stretched between the guide rolls 1c and 1d, are wound around a supply reel 1a and a take-up reel 1b.

The mode switching mechanism 3 includes a rotating cam 3a which is normally and reversely rotated in the directions of arrows a and b by a drive motor (not shown), and a central portion of which is connected to the chassis 2 through a pivot shaft 5 by arrows c ,. A cam pin 6 pivotally supported rotatably in the d direction and provided at one end thereof is mounted on a main lever 3b fitted in a cam groove 7 of a rotating cam 3a and slidable on the chassis 2 in the arrow e and f directions. An elongated hole 8 formed at one end of the main lever 3b is formed with a mode switching lever 3c engaged with an engagement piece 9 provided at the other end of the main lever 3b.

The reversing tape tension mechanism 4 has a tension post 4a facing the inner surface of the magnetic tape t, and the tension post 4a rotates on the chassis 2 via the pivot shaft 10 in the directions of arrows g and h. The pivot arm 4b is provided at the tip of a pivotally pivotable substantially L-shaped pivot arm 4b.
A base 12 of the main lever 3b is removably engaged with the protrusion 11 of the main lever 3b, and a spring 12 for urging the tension post 4a in a direction separating from the magnetic tape t is provided on the rotating arm 4b and the chassis 2. A stopper 13 is provided so as to be stretched between the protrusion 2a and the spring 12 so as to prevent the rotation arm 4b from rotating too far.

In FIG. 4, 14 is a movable tape guide post for pulling out the magnetic tape t from the tape cassette 1 and winding it around the head cylinder 15, 16 is a full width erasing head, 17 is a voice erasing head, 18 is a voice / control head, Reference numeral 19 is a fixed tape guide post, 20 is a capstan, and 21 is a capstan 20 via a magnetic tape t.
The pinch rollers 22 which are pressed into contact with and separated from each other are forward tension posts, which are interlocked with the mode switching lever 3c, and are inserted between both fixed tape guide posts 19 and pressed against the magnetic tape t in the reproduction mode (FIG. 5). reference).

In the above-mentioned structure, in the reproduction mode, FIG.
2, the tension post 4a is positioned in the tape cassette 1 so as not to be in contact with the magnetic tape t, and the normal rotation tension post 22 is inserted between the fixed tape guide posts 19 and pressed against the magnetic tape t. As a result, tension is applied to the magnetic tape t. In this state, the capstan 20 and the take-up reel 1b are rotated in the forward direction i, so that the magnetic tape t is under a constant tension. It is wound up on 1b.

When switching to the reverse reproduction mode, the rotary cam 3a may be rotated in the direction of arrow a. As a result, as shown in FIG. 4, the main lever 3b is rotated in the direction of arrow c, the projection 11 is pressed against the base end of the rotating arm 4b, and the rotating arm 4b is rotated in the direction of arrow h. The tension post 4a is moved and pressed against the magnetic tape t, whereby the magnetic tape t is pushed outward in a substantially V shape, and tension is applied to the magnetic tape t, and at the same time, the mode switching lever is pressed. 3c is an arrow f
By sliding in the direction, the forward rotation tension post 22 is released from between the fixed tape guide posts 19 and the tension on the magnetic tape t is released. In this state, the capstan 20 and the supply reel 1a are reversed j. The magnetic tape t is wound around the supply reel 1a under a constant tension.

[0009]

SUMMARY OF THE INVENTION In the above conventional configuration,
In the reverse playback mode, as shown by the solid line in FIG. 6, the tension post 4a moves from the inside of the tape cassette 1 to the outside and is pressed against the magnetic tape t, so that the magnetic tape t bends outward in a substantially V shape. Since the magnetic tape t is easily separated from the guide roll 1d, the frictional resistance generated between the magnetic tape t and the guide roll 1d becomes small, and the tension applied to the magnetic tape t becomes insufficient.
It may be difficult to smoothly wind the magnetic tape t with 0.

Also, when switching to the reverse playback mode,
Since the rotation speed of the rotation arm 4b is restricted by the main lever 3b and is slow, it takes a relatively long time to press the tension post 4a against the magnetic tape t to apply a predetermined pressure of tension to the magnetic tape t. Therefore, the magnetic tape t
The time margin from the time when the tension of a predetermined pressure is applied to the time when the capstan 20 is reversed to the time when the magnetic tape t is run is extremely short, and the tape running is likely to be unstable.

In view of the above-mentioned conventional drawbacks, the present invention provides a reversing tape tension mechanism for a magnetic tape device capable of quickly applying a predetermined pressure tension to the magnetic tape in the reverse reproduction mode and the reverse fast forward mode. Has an aim.

[0012]

In order to achieve the above object, the invention according to claim 1 is linked to the mode switching mechanism by operating the mode switching mechanism to switch to the reverse rotation reproduction mode or the reverse rotation fast forward mode. In the tape reversing tape tension mechanism of the magnetic tape device, the tension post is pressed against the magnetic tape and the supply reel of the capstan and the tape cassette is reversed to wind the magnetic tape around the supply reel. In the reverse playback mode and the reverse fast forward mode, the tape enters the tape cassette and is pressed against the magnetic tape.

According to the above construction, the tension post enters the tape cassette and is pressed against the magnetic tape in the reverse playback mode and the reverse fast forward mode, whereby the magnetic tape is bent inward in a substantially V-shape. Since the magnetic tape is pressed against the guide roll provided at the open end of the cassette, a tension of a predetermined pressure can be surely applied to the magnetic tape, and the magnetic tape can be smoothly wound by the capstan.

According to a second aspect of the present invention, in the first aspect of the present invention, the tension post is provided on a rotary arm that is interlockingly coupled with the mode switching mechanism in a disconnectable manner. A spring for urging the post toward the magnetic tape is provided. By activating the mode switching mechanism to switch to the reverse playback mode or reverse reverse fast-forward mode, the connection between the mode switching mechanism and the rotating arm is released. The rotation arm is rotated by the spring so that the tension post is pressed against the magnetic tape.

According to the above construction, by switching the mode to the reverse rotation reproduction mode or the reverse speed fast-forward mode, the connection between the mode switching mechanism and the rotary arm is released, and the rotary arm is swung by the spring at once, and the rotation thereof is performed. The tension post provided on the moving arm is pressed against the magnetic tape to instantly apply a predetermined pressure to the magnetic tape, and the capstan is removed from the time when the predetermined tension is applied to the magnetic tape. Since there is a time margin between the reverse rotation and the running of the magnetic tape, the tape running can be stabilized.

According to a third aspect of the present invention, in the second aspect of the present invention, a stopper is provided so as to face the rotary arm, and the rotary arm is moved by the spring in the reverse rotation reproduction mode and the reverse reverse fast feed mode. It is characterized in that the tension post is held at a predetermined position by pressing it against a stopper.

According to the above construction, the rotating arm is pressed against the stopper by the spring in the reverse rotation reproducing mode and the reverse reverse fast-forwarding mode to hold the tension post at a predetermined position. On the other hand, a certain tension can be surely applied.

[0018]

1 to 3 show a reverse tape tension mechanism of a magnetic tape device according to an embodiment of the present invention. FIG. 1 shows a reverse reproduction mode, and FIG. In the reproduction mode, the tension post 4a is opposed to the outer surface of the magnetic tape t.
A spring 24 for urging a toward the magnetic tape t is stretched between the rotating arm 4b and the protrusion 2a provided on the chassis 2, and the tension post 4a that has entered the tape cassette 1 is placed at a predetermined position. A stopper 25 is provided on the chassis 2 so as to hold it. With the configuration other than the above, the same parts as those in the conventional example shown in FIGS.

The engaged piece 2 is provided at the center of the rotating arm 4b.
6 is projectingly provided, and an engaging piece 27 is projectingly provided at a lower portion of the main lever 3b. By engaging the two pieces 26, 27 with each other in a disengageable manner, the rotating arm 4b switches the mode. It is interlockingly connected to the mechanism 3 so that the connection can be released.

In the above-mentioned structure, in the reproduction mode, FIG.
As shown in FIG.
4, the rotation arm 4b is rotated in the direction of the arrow h, whereby the tension post 4a is brought into a non-contact state with the magnetic tape t, and the normal rotation tension post 22 is fixed to both fixed tape guides. The magnetic tape t is pushed between the posts 19 and pressed against the magnetic tape t. In this state, the capstan 20 and the take-up reel 1b are rotated in the forward direction i, so that the magnetic tape t is applied with a certain tension. To be wound up.

When switching to the reverse rotation reproduction mode, the rotary cam 3a may be rotated in the direction of arrow a. As a result, as shown in FIG. 1, the main lever 3b is rotated in the direction of arrow c and the engaging piece 27 is separated from the engaged piece 26, so that the mode switching mechanism 3 and the rotating arm 4b are separated from each other. Is released, the rotating arm 4b is swung in the direction of arrow g by the spring 24 at once, and hits the stopper 25, and the tension post 4a provided on the rotating arm 4b.
Enters the tape cassette 1 and is pressed against the magnetic tape t. The magnetic tape t is bent inward in a substantially V-shape and pressed against the guide roll 1d.
A tension of a predetermined pressure is instantaneously applied to, and at the same time, the mode switching lever 3c is slid in the direction of the arrow f, so that the forward rotation tension post 22 is pulled out from between the fixed tape guide posts 19 to the magnetic tape t. The tension is released, and in this state the capstan 2
By rotating 0 and the supply reel 1a in the reverse direction j, the magnetic tape t is wound around the supply reel 1a under a constant tension.

In this case, as shown by the solid line in FIG. 3, when the tension post 4a is pressed against the magnetic tape t, the magnetic tape t is bent inward in a substantially V-shape and pressed against the guide roll 1d. The frictional resistance generated between the magnetic tape t and the guide roll 1d becomes large, and a tension of a predetermined pressure is surely applied to the magnetic tape t to smoothly wind the magnetic tape t by the capstan 20. be able to.

Further, since there is a time margin between when the tension of the magnetic tape t is applied to the magnetic tape t by the tension post 4a and when the magnetic tape t is run by reversing the capstan 20, the tape run is performed. Can be stabilized.

Further, since the rotating arm 4b is pressed against the stopper 25 by the spring 24 to hold the tension post 4a at a predetermined position, the tension post 4a ensures a certain tension to the magnetic tape t. Can be given to.

In the above embodiment, the case where the reproduction mode is switched to the reverse reproduction mode has been described as an example, but the present invention is not limited to this, and the present invention is also applied to the reproduction fast-forward mode and the reverse fast-forward mode.

[0026]

According to the first aspect of the present invention, the tension post enters the tape cassette and is pressed against the magnetic tape in the reverse playback mode and the reverse fast forward mode, so that the magnetic tape is inwardly V-shaped. Since it is bent into a shape and pressed against a guide roll provided at the open end of the tape cassette, it is possible to reliably apply a tension of a predetermined pressure to the magnetic tape and smoothly wind the magnetic tape by the capstan. it can.

According to the second aspect of the invention, by switching to the reverse rotation reproduction mode or the reverse rotation fast forward mode,
The connection between the mode switching mechanism and the turning arm is released, the turning arm is turned at once by the spring, the tension post provided on the turning arm is pressed against the magnetic tape, and the predetermined pressure is applied to the magnetic tape. The tension is applied instantly, and there is time to run the magnetic tape by reversing the capstan after the tension of a predetermined pressure is applied to the magnetic tape. Can be stabilized.

According to the third aspect of the invention, in the reverse rotation reproduction mode and the reverse rotation fast forward mode, the rotating arm is pressed against the stopper by the spring to hold the tension post at a predetermined position. Thereby, a certain tension can be surely applied to the magnetic tape.

[Brief description of drawings]

FIG. 1 is a schematic plan view showing a reverse reproduction mode of a reverse tape tension mechanism of a magnetic tape device according to an embodiment of the present invention.

FIG. 2 is a schematic plan view showing the reproduction mode.

FIG. 3 is an enlarged plan view of the main part.

FIG. 4 is a schematic plan view showing a reverse reproduction mode of a reverse tape tension mechanism of a conventional magnetic tape device.

FIG. 5 is a schematic plan view showing the reproduction mode.

FIG. 6 is an enlarged plan view of the main part.

[Explanation of symbols]

1 tape cassette 1a Supply reel 1b Take-up reel 3 mode switching mechanism 4 Reverse tape tension mechanism 4a Tension post 4b rotating arm 24 springs 25 stopper 26 Engagement piece 27 engagement piece i forward rotation j reverse t magnetic tape

Claims (3)

(57) [Claims] 1. A mode switching mechanism is operated to switch to a reverse rotation reproduction mode or a reverse rotation fast forward mode,
A reversing tape of a magnetic tape device in which a tension post linked to the mode switching mechanism is pressed against a magnetic tape and the supply reel of a capstan and a tape cassette is reversed to wind the magnetic tape around the supply reel. In the tension mechanism, the tension post is adapted to enter the tape cassette and be pressed against the magnetic tape in the reverse rotation reproduction mode and the reverse reverse fast-forward mode so as to be pressed against the magnetic tape. 2. The tension post is provided on a rotary arm that is interlockingly coupled to the mode switching mechanism in a releasable manner, and a spring that biases the tension post toward the magnetic tape via the rotary arm is provided. By operating the mode switching mechanism to switch to the reverse rotation reproduction mode or the reverse rotation fast forward mode, the connection between the mode switching mechanism and the rotating arm is released, and the rotating arm is rotated by the spring. The tension post is adapted to be pressed against the magnetic tape.
A tape tension mechanism for reversing the magnetic tape device described. 3. A stopper is provided so as to face the rotating arm, and the rotating arm is pressed against the stopper by the spring to hold the tension post at a predetermined position in the reverse rotation reproduction mode and the reverse reverse fast-forward mode. The tape tension mechanism for reverse rotation of the magnetic tape device according to claim 2, wherein