JPH0388164A - Tape tension mechanism - Google Patents

Abstract

PURPOSE:To quickly perform migration from a stopping state or a fast feeding state to a playing state by providing two tape contact parts at a tape contact member. CONSTITUTION:Two tension adjusting pins 14, 14 are provided at the tape contact member 25. If a tension adjusting pin 14' with a prescribed energizing force comes in contact with a magnetic tape 4, an angle theta is formed. Since the pins 14 are located at a position in the neighborhood of a guide post 6 or a tape loading post 8 at the member 25 compared with one pin 14', it is enough to rush them to the tape 4 lightly to impart the same tension. Therefore, a gap B between a tape contact position and a tape separating position is reduced by width where rushing quantity is reduced. In such a way, the migration from the stopping state or the fast feeding state to the playing state is quickly performed in a short time.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a tape tension mechanism that can apply a constant tension to a tape positioned on a constant tape running path as necessary. For example, it is used in video tape recorders, digital audio tape recorders, etc. that use magnetic cassette tapes.

[Conventional technology]

For example, when a cassette tape is loaded into a video tape recorder, the tape inside the cassette tape is pulled out by a tape pull-out mechanism and wound around a rotating magnetic head drum, at which time a predetermined tape running path is formed. become. In recent years, during play, so that the transition from the stop state to the play state can be performed in a short time, and furthermore, the transition between the play state and the fast forward state can be performed quickly. The same tape running path is maintained both during stop and during fast forwarding.

The tape running path includes a tape guide system such as a guide post, a tape drive system consisting of a capstan and a pinch roller, and a tape tension mechanism that applies a predetermined tension to the tape so that the tape runs in a predetermined manner. are arranged.

The conventional tape tension mechanism, as shown in Figure 6,
One tension adjustment pin 30 is provided, and during play, a predetermined biasing force is applied to the tension adjustment pin 30 to move it to the tape contact position (corresponding to the solid line position in the figure), while the tape tension is adjusted during stop and fast forwarding. Since there is no need to apply tension and it is necessary to reduce the winding torque during fast forwarding, the tension adjustment pin 30 is set to the tape-separated position both during stop and during fast forwarding!
(corresponding to the virtual line position in the figure).

[Problem to be solved by the invention]

By the way, as mentioned above, when applying a predetermined tension to the tape 31, it is known that the wrapping around the tension adjustment pin 30 becomes more efficient as the angle approaches 180°.

However, even if the angle of the tension adjustment pin 30 is approximately 90'', it is necessary to push the tension adjustment pin 30 into the tape 31 to a considerable extent, and the distance between the tape contact position and the tape separation position is A becomes large. When transitioning from the stop state to the play state, the tension adjustment pin must be moved from the tape separation position to the tape contact position, and this movement takes a relatively long time, so it is necessary to move it quickly. It has the disadvantage that it cannot be switched.

[Means to solve the problem]

In order to solve the above problems, the tape tension mechanism according to the present invention applies a predetermined biasing force to a tape contact member when applying tape tension to a tape positioned on a predetermined tape running path. In the tape tension mechanism that causes the tape contact member to make contact with the tape while separating the tape contact member from the tape when no tension is applied, the tape contact member is characterized in that the tape contact member is provided with two tape contact portions.

[For production]

According to the above configuration, the distance between the tape contact position and the tape separation position on the tape contact member is shorter than when the tape contact member has one tape contact portion. This makes it possible to quickly transition from the stop state or fast-forward state to the play state in a short time.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 5.

As shown in FIG. 1(a), when the cassette tape 1 on which the magnetic tape 4 is wound is loaded into the apparatus, the supply reel stand in the apparatus is connected to the supply reel and take-up reel of the cassette tape L. 2 and the take-up reel stand 3 are engaged, and the magnetic tape 4 is pulled out and wound around the rotating magnetic head drum 5, at which time a predetermined tape running path is formed.

On the tape running path, there are guide posts 6 and 7, tape loading posts 8 and 9, and (slanted guide post 1)
0 and 11 constitute a tape guide system, and the guide boss 7 and tape loading boss 9
between the capstan 12 and the pinch roller 13
A tape drive system is comprised of these.

And in the tape tension mechanism according to the present invention,
The tape contact member 25 is fixed to the first working piece portion 15a of the tension adjustment arm 15. The tension adjustment arm 15 can be rotated about a support shaft 16, and this rotation causes the tape contact member 25 to move in the direction in which it comes into pressure contact with the magnetic tape 4 between the guide post 6 and the tape loading post 8, It is accustomed to move in the direction away from 4.

Further, as shown in FIG. 2, the tape contact member 25 is
It is composed of two tension adjustment pins 14 arranged at a constant interval from each other, and each tension adjustment pin 1
4 forms a tape contact portion. One tension adjustment pin 14 is located close to the guide post 6, and the other tension adjustment pin 14 is located close to the tape loading post 8.

The second action piece portion 15b of the tension adjustment arm 15 includes:
The first mounting portion 17a of the tensioning band 17 is locked, the main body portion of the tensioning band 17 is wound approximately half a turn around the drum portion of the supply reel stand 2, and the second mounting portion 17b of the tensioning band 17 is It is fixed to the locking part 19 with screws 18. The second action piece portion 15b is moved by the rotation of the tension adjustment arm 15, and this movement pulls and pushes the tension applying band 17 to apply and release rotational resistance to the supply reel stand 2.

One end of a coil spring 20 is engaged with the first operating piece 15C of the tension adjustment arm 15, and the tension adjustment arm 15 is biased clockwise by the coil spring 20. Further, a locking pin 21 is provided upright on the second operating piece portion 15d of the tension adjustment arm 15, and this locking pin 21 is engaged with a cam portion 23 of a switching member (switching means) 22. There is. The switching member 22 is moved in the CD direction by a tape loading drive motor (not shown).

The cam portion 23 has a first step portion 23a that does not come into contact with the engagement pin 21 in the engaged state, and a second step portion 23b that engages and contacts the engagement pin 21 and pushes it up sufficiently. The state of engagement with the retaining pin 21 is changed by moving the switching member 22 in conjunction with the play operation, stop operation, and fast forward operation.

In the above configuration, during play, the retaining pin 21 is engaged with the first step portion 23a, as shown in FIG. 1(a). At this time, the engagement pin 21 and the first step portion 23a
Since a predetermined gap is formed between the tension adjustment arm 15 and the upper end surface, free rotation of the tension adjustment arm 15 is ensured, and the tape contact member 25 is biased by the coil spring 20 to move it to the tape contact position. can be moved to

Therefore, a predetermined tension can be applied to the running magnetic tape 4. In addition, during such a play, the second action piece 15b of the tension adjustment arm 15 also pulls the tensioning band 17 with urging force, so a load is applied to the supply reel stand 2 by the tensioning band 17. Become.

When stopping and fast forwarding, the switching member 22 is moved in the C direction, as shown in FIG.
engages with the engagement pin 21 and these come into contact. Due to this contact, the retaining pin 21 is pushed up and the tension adjustment arm 15 is rotated counterclockwise. Therefore, the tape contacting member 25 is moved to the tape separating position completely away from the magnetic tape 4, and no tension is applied to the tape, making it possible to reduce the winding torque. Note that at this time, the second action piece 15b of the tension adjustment arm 15 also rotates counterclockwise, so that a sufficient gap is formed between the tension applying band 17 and the drum portion of the supply reel stand 2. It turns out. Due to this gap, the load on the supply reel stand 2 is released.

Here, as shown in FIG. 2, the distance B between the tape contact position and the tape separation position in the tape contact member 25 is shorter than the distance when there is only one tension adjustment pin 14'. This is because the tape contact member 25 consists of two tension adjustment pins 14. That is, if one tension adjustment pin 14' having a predetermined urging force contacts the magnetic tape 4, an angle e shown in the figure will be formed, but in the tape contact member 25, each tension adjustment pin 14 are located closer to the guide post 6 or the tape loading post 8 than the other tension adjustment pins 14', respectively.
In order to maintain the above angle e (that is, apply the same tension), it is only necessary to push the magnetic tape 4 shallowly. Therefore, the interval B between the tape contact position and the tape separation position becomes shorter than before by an amount corresponding to the shallower thrust amount, and as a result, the transition from the stop state or fast forward state to the play state can be performed quickly and in a short time. It becomes possible. In this case, the closer the tension adjustment pin 14 is to the guide post 6 and tape loading post 8, the shallower the amount of thrust.

In this embodiment, the tape contact member 25 is composed of two tension adjustment pins 14, 14, but as shown in FIGS. Tape contact portions 25a, 25a may be formed on the two sides. According to this, the number of parts can be reduced and assembly can be facilitated. For example, as shown in FIG. 5, it is sufficient to simply fix the tape contact member 25 to the tip of the first working piece 15a of the tension adjustment arm 15 with a screw 26. In this case, the tape contact member 25 may be provided to rotate around the screw 26, and in this way, it is possible to prevent the tape contact portions 25a from hitting each other unevenly.

〔Effect of the invention〕

As described above, the tape tension mechanism according to the present invention has the following features:
A tape that applies a predetermined biasing force to a tape contact member to bring the tape into contact with the tape positioned on a predetermined tape running path when applying tape tension, while separating the tape contact member from the tape when no tension is applied. In the tension mechanism, the tape contact member includes:
It has a configuration in which two tape contact parts are provided.

This has the effect that the transition from the stop state or fast forward state to the play state can be quickly performed in a short time.

[Brief explanation of drawings]

1 to 5 show one embodiment of the present invention. FIG. 1(a) is an explanatory diagram of the state of the tape tension mechanism during play, and FIG. 1(b) is an explanatory diagram of the state of the tape tension mechanism during stop and fast forwarding. FIG. 2 is an explanatory diagram of the operation of the tape contact member. FIG. 3 is a diagram illustrating the state of the tape tension mechanism using the integrated tape contact member during play. FIG. 4 is an explanatory diagram of the operation of the tape contact member. FIG. 5 is a perspective view showing how the tape contact member is assembled to the tension adjustment arm. FIG. 6 shows a conventional example and is an explanatory diagram of the operation of the tape contact member. 4 is a magnetic tape, 5 is a rotating magnetic head drum, 14 is a tension adjustment pin (tape contact part), 15 is a tension adjustment arm, 17 is a tension imparting band, 20 is a coil spring, 21 is an engagement pin, 22 is a switching member , 23 is a cam portion, 25 is a tape contact member, and 25a is a tape contact portion.

Claims (1)

[Claims] 1. When applying tape tension to a tape positioned on a predetermined tape running path, the tape contacting member is brought into contact with the tape by applying a predetermined biasing force, while when no tension is applied, the tape is brought into contact with the tape. A tape tension mechanism for separating a contact member from a tape, wherein the tape contact member is provided with two tape contact portions.