JPH0532819B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a tape running device for stably running a tape, and is particularly applicable to magnetic recording and reproducing devices.

BACKGROUND ART In recent years, magnetic recording and reproducing devices (hereinafter referred to as VTRs) have been becoming smaller in size in response to user requests and technological advances. Furthermore, there is an increasing demand for expanded functions other than normal playback, such as rewind playback.

Hereinafter, an example of a tape running device for a VTR that has already been proposed will be described with reference to the drawings.

FIG. 5 shows a plan view of a tape running device that has already been proposed. In the figure, 1 is a tape cassette that houses a supply reel 3 and a take-up reel 4 on which a tape 2 is wound. Reference numeral 5 denotes a rotating head cylinder (hereinafter referred to as cylinder) around which the tape 2 is wound by a loading post 6. Reference numeral 7 denotes a tilting post for tilting the tape 2; reference numeral 8 denotes a regulating post placed near the tilting post 7 to regulate the running position of the tape 2; reference numeral 9 provides a regulating post near the regulating post 8 for controlling the tension of the tape 2; This is a tension post that is controlled by rotating.

In the tape running device configured as above,
By moving the tension post 9 in the directions of arrows A and B during recording, playback, and rewind playback, the tension of the tape 2 is held within a certain range and the tape 2 is stably run.

Problems to be Solved by the Invention However, in the above configuration, the tape tension force during rewind playback is greater than during normal playback, and the tension post 9 moves greatly in the direction of arrow B, resulting in As shown, the tape 2 either separates from the side surface 8a of the regulating post 8 and becomes a tape 2a, or falls off from the flange, making it impossible for the tape 2 to run stably, making it impossible to obtain an appropriate head output. Furthermore, since the tape runs unstably, it comes into contact with parts outside the range where the tape normally runs, causing damage to the tape.

In view of the above-mentioned problems, the present invention provides a tape running device that can stably run a tape during recording, playback, and rewind playback.

Means for Solving the Problems In order to solve the above problems, the tape running device of the present invention draws out the tape from the tape cassette and tilts the tape in order to spirally wind it around the outer periphery of the rotating head cylinder. slanted post;
A regulation post that regulates the running position of the tape near the inclined post, a first lever that moves on the board corresponding to the operation mode such as recording, playback, rewind playback, etc. a second lever having one end rotatably supported by the base plate and having a first cam portion that engages with the lever pin and rotates in accordance with the operation mode; and one end rotatably supported by the base plate. A tension arm that is rotatably supported and biased in a predetermined direction, and has a tension post at the other end that controls the tension of the tape, and an engaging pin that is planted on the tension arm and that is in contact with the tension arm. and a second cam portion formed on the second lever that restricts rotation of the tension arm.

Effects According to the above-described structure, the tension post is located in the opposite direction to the tape cassette with respect to the extension line of the tangent connecting the outer periphery of each of the inclined post and the regulation post when the operation mode is rewind playback. As such, the rotation of the tension arm is regulated by the contact between the engagement pin and the second cam portion formed on the second lever, allowing stable tape running without the tape separating from the side of the regulation post. becomes possible.

Embodiment Hereinafter, a tape traveling device according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a plan view showing a tape traveling device according to an embodiment of the present invention.

In the drawings, the same elements as those explained in FIGS. 5 and 6 are given the same numbers and their explanations will be omitted. Reference numeral 10 designates a tension arm having a tension post 9 installed at one end thereof, and a spring member 11 is engaged with the tension arm 10 to urge the tension arm 10 to rotate counterclockwise. The tension arm 10 is provided with an engagement pin 14 that can freely engage with a second cam portion 13 formed at one end of the second lever 12 . A stopper 15 is provided on the base plate to come into contact with the tension arm 10 and restrict the rotation of the tension arm 10 when the tension arm 10 rotates counterclockwise.

FIG. 2a is a plan view of the main part of a tape running device according to an embodiment of the present invention, and FIG. 2b is a perspective view of the main part. When the tape cassette 1 is attached to the board, the opening 1 formed in the tape cassette 1
A loading post 6 and a tension post 9 are inserted from below the tape cassette 1 into the tape cassette 1 (indicated by dotted lines in FIG. 2). tape cassette 1
A loading post 6 and a pinch roller 15 are inserted into the other opening 1b. The second lever 12 is fixed to the base plate and rotatably supported on the base plate around a support shaft 12a. A first cam portion 16 is formed on the second lever 12, and is mounted on a first lever 17 that moves in parallel on the board according to each operation mode such as recording, playback, stop, and rewind playback. lever pin 18 and first cam part 1
6 is engaged. The first lever 17
Regardless of the position of the rotatably supported portion of the lever 12 and the first lever 17, an elongated hole is provided (not shown) that allows non-contact at all times.
The cam portion 16 has cam surfaces 16a, 16b, 16c, 1
6d and 16e are arranged continuously so that the lever pin 18 can pass therethrough. Here, when the first lever 17 moves from the cassette device position in the direction of arrow C, the lever pin 18 and the cam surface 16b of the first cam portion 16 formed on the second lever 12 engage with each other, and the first The cam surfaces 16b, 16 of the cam portion 16 of
c, 16d, 16e according to the shape of the second lever 1
2 rotates clockwise around the support shaft 12a. The tension arm 10 maintains the position shown in FIG. 2 against the biasing force of the spring member 11 because the engagement pin 14 and the second cam portion 13 of the second lever 12 are in contact with each other. However, the second lever 1
2 rotates counterclockwise around the shaft 10a. The tension arm 10 stops rotating by coming into contact with the stopper 15. (This position is shown in FIG. 2 by the tension post 9 being in point contact.) Note that 19 holds the pinch roller 15 and the tape 2,
This is the capstan that drives the. 10b has one end rotatably supported by the tension arm 10,
The other end is a tension band (not shown) fixed at a position around a supply reel stand (not shown).

The operation of the tape running device of this embodiment constructed as described above will be explained with reference to FIGS. 1 to 4.

Now, when the tape cassette 1 is mounted on the main body board, the first lever 17, the second lever 12, and the tension arm 10 are in the position shown in FIG. The loading post 6, tension post 9, and pinch roller 15 each have a tape cassette 1.
The tape 2 is stretched over the front surface of the tape cassette 1 as shown by the two-dot chain line in FIG.

Next, the process of winding the tape 2 around the cylinder 5 will be explained. According to the operation mode such as recording or playback,
The loading post 6 and the pinch roller 15 move the tape 2 to the tape cassette 1 from the dotted line position shown in FIG. 1 to the solid line position by a mechanism not shown.
Move while pulling it out. Along with this operation, the first lever 17 moves in the direction of arrow C shown in FIG. As the first lever 17 moves, the lever pin 18 touches the first cam surface 16 of the second lever 12.
b, 16c, 16d, and 16e in order, and according to this cam shape, the second lever 12 engages with the support shaft 12.
Rotate clockwise around a. second lever 1
2, the contact position between the engagement pin 14 formed on the tension arm 10 and the second cam portion 13 shifts, and the tension arm 10 rotates counterclockwise around the shaft 10a. Then, it stops when it comes into contact with the stopper 15. The above state is shown by the solid line in FIG. 1, and the main part is shown in FIG.

FIG. 3 is a plan view of essential parts showing the operation of the tape running device according to an embodiment of the present invention during reproduction. To explain the operation during playback using FIG. 3, the tape 2 travels in the direction of arrow D, but the amount of tape wound around the supply reel 3 changes from time to time, and the amount of tape 2 wound around the supply reel 3 changes from time to time. The diameter changes. When the diameter of the tape 2 changes and the tension of the tape 2 in the running direction becomes stronger, the tension post 9 moves in the direction of arrow F, and the tension band 10b crimped to the supply reel stand (not shown) loosens. Therefore, the brake is loosened and the tape 2 is smoothly fed out. Conversely, if the tape 2 becomes loose, a brake is applied to the rotation of the supply reel stand. Here, the maximum movement of the tension post 9 during reproduction is up to a position 20a shown by a dashed line. Therefore, the tape 2 does not separate from the side surface 8a of the regulating post 8 that regulates the running position of the tape 2. Therefore, the second lever 12 is moved so that the second cam portion 13 and the engagement pin 14 do not come into contact with each other.
is the lever pin 18 and the cam surface 16e of the cam portion 16.
regulated by.

Next, the operation during reverse playback will be explained using FIG.

When the operation mode changes from the playback state to the reverse playback state, the first lever 17 moves in the direction G in FIG. 3. As the first lever 17 moves, the first cam part 16 that is engaged with the lever pin 18 moves to the cam surfaces 16e, 16d, and 16c, so that the second lever 12 moves the support shaft 12a. It rotates clockwise around the center and stops at the position shown in Figure 4. In other words, the engagement pin 1 is
The second lever 12 is in a position where its rotation is restricted so as to restrict the movable range of the lever 4 in the F direction. In this state, the tape 2 is pinched by the capstan 19 and the pinch roller 15 on the inlet side of the cylinder 5 and fed out. Further, on the output side of the cylinder 5, the supply reel 3 is driven to rotate and the tape 2 is wound up. As described above, the tape 2 travels in the direction of arrow E. At this time, the winding diameter of the tape 2 changes, the tension becomes stronger, and during reverse playback, the winding torque of the supply reel stand 3 is applied directly to the tape 2 without going through the capstan 19 and the pinch roller 15.
As a result, the tension post 9 moves more in the direction of arrow F than during playback. However, the rotation of the tension arm 10 is restricted by the lever pin 18 of the first lever 17 and the cam surface 16c of the cam portion 16 of the second lever 12 at the position 20b shown by the dashed line. When the second cam portion 13 of the lever 12 and the engagement pin 14 come into contact with each other, rotational movement in the direction of arrow F is restricted. The position where this rotational movement is regulated is from the position opposite to the tape cassette 1 to the position where the tension post 9 is in the forward direction with respect to the extension line H of the tangent connecting the outer peripheries of the inclined post 7 and the regulating post 8. It is a moving point. Therefore,
During this reverse playback, the tape 2 is
The tape 2 can run stably without leaving the position a. Here, the reason why the tension control of the tape 2 is stopped midway is because the driving force is applied to the tape 2 on both the input side and the output side of the cylinder 5, so even if you try to weaken the tape tension, it will not weaken. This is because there is no Therefore, in this embodiment, the tape tension 9 is configured to move in a position opposite to the tape cassette 1 with respect to the extension line H of the tangent connecting the outer periphery of each of the inclined post 7 and the regulating post 8 during reverse playback. However, it may be fixed at a position in the opposite direction.

Effects of the Invention As described above, according to the present invention, when the operation mode is rewind playback, the tension post is positioned in the opposite direction to the tape cassette with respect to the extension line of the tangent connecting the outer peripheries of each of the inclined post and the regulation post. The tape is regulated by the engagement pin formed on the tension arm and the second cam portion formed on the second lever contacting and regulating the rotation of the tension arm provided with the tension post. Stable running is possible without leaving the side of the post.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing a tape running device according to an embodiment of the present invention, FIGS. 2, 3, and 4 are plan views of main parts for explaining the operation of the device, and FIG. 5 is a conventional tape running device. FIG. 6 is a plan view of the tape running device, and FIG. 6 is a perspective view showing the main parts of the device. DESCRIPTION OF SYMBOLS 1... Tape cassette, 2... Tape, 5... Rotating head cylinder, 7... Inclined post, 8... Regulating post, 9... Tension post, 10... Tension arm, 12... Second lever, 13... Second cam Part, 14...Engagement pin, 16...First cam part, 17
...First lever, 18...Lever pin.

Claims (1)

[Claims] 1. A tilted post that tilts the tape to pull out the tape from the tape cassette and wind it spirally around the outer circumference of the rotary head cylinder, a regulation post that regulates the running position of the tape near the tilted post, and a recording/recording post. a first lever that moves on the board in response to an operation mode such as playback, rewind playback, etc.;
a lever pin formed on the first lever;
a second lever having one end rotatably supported by the base plate and having a first cam portion that engages with the lever pin and rotates in accordance with the operation mode and whose movable range is regulated; a tension arm that is rotatably supported by the tape, is rotatably biased in a predetermined direction, and has a tension post at the other end for controlling the tension of the tape; a second cam portion formed on the second lever that comes into contact with the dowel pin and restricts rotation of the tension arm, and when the operation mode is rewinding and playback, the tension post is connected to the tilted post and the restriction post. A second cam portion formed on the engagement pin and the second lever rotates the tension arm so that the tension arm is positioned in a direction opposite to the tape cassette with respect to an extension line of a tangent connecting the outer peripheries of each. A tape running device characterized in that the second lever is regulated by the lever pin and the first cam portion so as to be regulated by contact with the second lever.