JPS61236057A - Tape guide device for vtr - Google Patents

Abstract

PURPOSE:To prevent the shifting in the width direction of the tape and to obtain the clear picture without interrupting the loading and unloading of the cassette, even not only at the time of the video recording and reproducing but also at the time of the quick feeding search or the rewinding search by contacting the tape guide member with the tape when the pinch roller contacts with a capstan shaft and separating the tape guide member from the tape when the pinch roller is separated. CONSTITUTION:A tape guide member 24 synchronizes with the connecting and separating action of a pinch roller 12 for a capstan shaft 14. Namely, when the pinch roller 12 contacts with a capstan shaft 14, a tape contacting surface 26 of a tape guide member 24 contacts with a tape 4 in a cassette 1, and when the pinch roller 12 is separated from the capstan shaft 14, the tape contacting surface 26 of the tape guide member 24 is also separated from the tape 4 in a cassette 1. Consequently, when the tape 4 is travelled at a high speed, the tape is guided by the tape guide member 24 in the vicinity of the capstan shaft 14 which is a tape driving source, and therefore, the oscillation in the width direction of the tape 4 can be prevented. Thus, the clear picture can be obtained at the time of the quick feeding search or the rewinding search.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a tape guide device for a VTR that prevents vibrations in the width direction of the tape.

[Conventional technology]

FIG. 5 shows a schematic configuration of a VTR, in which a take-up reel 2. The tape 4 wound between the supply reels 3 is guided by loading tape guides 5a, 6a and 5b, 6.
is pulled out of the cassette 1 by the video head 7a.
, 7b is wound around the outer periphery of the cylinder 8 about half a turn.

A full-width erasing head 9 and a guide roller 10 are provided at a position closer to the tape supply side than the cylinder 8, and an audio erasing head 11 and a pinch roller 12 are provided at a position closer to the tape winding side than the cylinder 8. pinch roller 1
2 is rotatably supported by a movable member 13, and moves toward and away from the capstan shaft 14 by the movement of the movable member 13.

Note that reference numerals 15, 16, and 17 in the figure indicate guide rollers provided inside the cassette 1. Further, in the figure, 18 and 19 are fixed tape guides provided outside the cassette 1, and 20 are movable tape guides provided outside the cassette 1. Roughly speaking, 21 in the figure is a tension regulator fixedly provided outside the cassette 1.

[Problem that the invention seeks to solve]

When the tape 4 is running, if the tape 4 vibrates in the width direction with respect to the video heads 7a and 7b, the recording and playback performance will deteriorate. 5a and 5b, 6b
e is provided to prevent the tape 4 from moving in the width direction. Similarly, a tape guide 19 for preventing the tape 4 from moving in the width direction is also provided for the audio erasing pad 11.

However, when performing a fast-forward search or a rewind search, the running speed of the tape 4 may be 5 to 6 during recording and playback.
The tape 4 becomes more likely to vibrate in the width direction. For this reason, there is a problem in that images tend to become unclear during fast-forward or rewind searches.

As a measure to prevent vibration in the width direction of the tape, it is desirable to provide a tape guide near the capstan shaft 14, which is the tape drive source.
It is difficult to secure space for installing a tape guide near the
There is a possibility that attachment and detachment of the cassette 1 will be obstructed.

[Purpose of the invention]

The present invention was made to solve such problems, and its purpose is to allow the cassette to be attached and detached without hindering the attachment and detachment of the cassette.
To provide a tape guide device for a VTR which can prevent the tape from moving in the width direction not only during recording and playback but also during fast forward search or rewind search and can obtain a clear image.

[Means for solving problems]

The tape guide device for a VTR according to the present invention is provided with a tape guide member that is synchronized with a movable member that supports the pinch roller at a position near the pinch roller, and when the pinch roller contacts the capstan shaft, the tape guide member is brought into contact with the tape. The above object is achieved by separating the tape guide member from the tape when the pinch roller separates from the capstan shaft.

〔Example〕

1 to 4 show an embodiment of the present invention,
The same parts as in FIG. 5 are indicated by the same reference numerals.

The difference between the tape guide device of this embodiment and the device shown in FIG. 1 is that a tape guide member 24 is attached to a movable member 23 that supports the pinch roller 12.

The tape guide member 24 is made of synthetic resin, and has a through hole 25 at one end as shown in FIG.
The other end side has a tape contact surface 26 that contacts the tape 4, and protrusions 27a and 27b are provided at the upper and lower ends of the tape contact surface 26 to restrict movement of the tape 4 in the width direction. Further, an inclined piece 28 is formed on the upper surface of the other end side,
Legs 29 are formed on the lower surface of one end.

On the other hand, the movable member 23 supporting the pinch roller 12 is
As shown in the drawings and FIG. 4, it is rotatable about a shaft 30, and supports the pinch roller 12 at its rotating end. A fixed shaft 31 is provided upright near the support portion of the pinch roller 12, and an opening 32 is provided near the shaft 31.

Therefore, the tape guide member 24 is attached to the movable member 23 by fitting the fixed shaft 31 into the through hole 25 and inserting the leg portion 29 into the opening 32. Further, a deployment spring 33 shown in FIG. 2 is attached to the lower part of the fixed shaft 31, and both ends of this spring 33 are locked to the upper plate of the movable member 23 and the leg portions 29 of the tape guide member 24, so that the tape guide The member 24 is urged to rotate in a certain direction.

Note that the biasing direction of the tape guide member 24 is the direction in which the tape contact surface 26 is brought into contact with the tape 4. The rotation range of the tape guide member 24 is between the leg portion 29 and the opening 3.
It is limited by the fitting with 2.

3 and 4 show a mechanism for rotating the movable member 23. In the figures, 34 is a first link that rotates together with the rotating member 23, and 35 is a first link that rotates around an axis 36. There are 2 links. 1st. The second link 34.35 is the third link. The third . A tension spring 39 is hung between the fourth links 36 and 37. Further, another tension spring 40 is hung between the second link 35 and any fixed portion, and the rotation of the second link 35 due to this spring 40 is restricted by a stopper pin 41.

In the figure, reference numeral 42 denotes an interlocking member that has a pressing roller 43 at its tip and is provided so as to be able to move forward and backward. This interlocking member 42 moves forward in conjunction with the loading operation of the cassette 1. The connection points of the second links 37 and 38 are pressed to bring the pinch roller 12 into pressure contact with the capstan shaft 14 as shown in FIG.

At this time, the third link 35 separates from the stopper pin 41, so the tension spring 40 urging the third link 35 generates a pressing force between the pinch roller 12 and the capstan shaft 14. Further, the interlocking member 42 moves backward in conjunction with the cassette ejecting operation, but at this time, the pinch roller 12 moves toward the capstan shaft 1 as shown in FIG.
Move away from 4.

Further, the tape guide member 24 is connected to the capstan shaft 14.
This is synchronized with the movement of the pinch roller 12 toward and away from the target. That is, when the pinch roller 12 contacts the capstan shaft 14, the tape contact surface 26 of the tape guide member 24 comes into contact with the tape 4 in the cassette 1 (FIG. 4), and the pinch roller 12 separates from the capstan shaft 14. At this time, the tape contact surface 26 of the tape guide member 24 is also separated from the tape 4 in the cassette 1 (FIG. 3).

Therefore, according to the tape guide device configured as described above, even if the tape 4 runs at high speed during a fast forward search or a rewind search, the tape is moved by the tape guide member 24 near the capstan shaft 14 which is the tape drive source. Since the tape 4 is guided, vibration in the width direction of the tape 4 can be prevented, and a clear image can be obtained even during fast forward search or rewind search. Moreover, since the tape guide member 24 is attached to the rotating member 23 common to the pinch roller 12, it moves toward and away from the tape 4 in synchronization with the movement of the pinch roller 12 toward and away from the capstan shaft 14. There is no problem in attaching and detaching the cassette 1. Even in the unlikely event that the rotating member 23 rotates in the direction of the cassette 1 before the cassette 1 is loaded, the tape guide member 24 is provided with an inclined piece 28 at the upper end. , the lower plate of cassette 1 is the inclined piece 2
8, and the tape guide member 24 is rotated in the opposite biasing direction against the spring 33, thereby smoothly loading the cassette 1'. Furthermore, since the tape guide member 24 is attached to the same movable member as the pinch roller 12, there is no difficulty in securing a space for attaching the tape guide member 24.

Note that the present invention is not limited to the above embodiments.

For example, the movable member to which the pinch roller 12 and tape guide member 24 are attached may not be rotatable, but may be movable linearly and reciprocally. Further, the tape guide member does not necessarily need to be attached to the rotating member 23 common to the pinch roller 12,
The point is that it should be provided near the pinch roller, and the movement toward and away from the tape may be performed in synchronization with the movable member.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to prevent the tape from moving in the width direction not only during recording and playback, but also during fast forward search or rewind search, without interfering with the attachment and detachment of the cassette. It is possible to provide a tape guide device for a VTR that can obtain the following.

[Brief explanation of drawings]

1 to 4 show an embodiment of the present invention,
Figure 1 is a schematic configuration diagram of a VTR tape guide device, Figure 2
5 is a perspective view of the tape guide member, FIGS. 3 and 4 are plan views showing the peripheral portion of the tape guide member, and FIG. 5 is a schematic configuration diagram of a conventional VTR tape guide device. DESCRIPTION OF SYMBOLS 1... Cassette, 4... Tape, 12... Pinch roller, 14... Capstan shaft, 23... Movable member 1.24... Tape guide member, 26... Tape contact surface , 27a, 27b... protrusion, 28... inclined piece, 33... expansion spring. Applicant's agent Patent attorney Takehiko Suzue Figure 2

Claims (1)

[Claims] A pinch roller guide member is provided near the pinch roller supported by the movable member, the tape guide member is synchronized with the movable member, and the tape guide member is brought into contact with the tape when the pinch roller contacts the capstan shaft. A tape guide device for a VTR, characterized in that movement of the tape in the width direction is prohibited, and when the pinch roller separates from the capstan shaft, the tape guide member is separated from the tape.