JPS6145294B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic recording and reproducing apparatus which is equipped with a video head and allows the tape guide drum to be easily replaced without damaging the magnetic tape while the magnetic tape is loaded in the tape running path. The present invention relates to a tape guide device (hereinafter simply referred to as a tape guide device).

FIG. 1 is a schematic explanatory diagram of a conventional tape guide device. A lower tape guide drum 1 is provided with a tape guide rail 1A and is fixed to a substrate 2. The lower tape guide drum 1 is attached to the substrate 2 at a predetermined inclination angle with respect to the tape 3 drawn out parallel to the video cassette. 4 is
This is a rotatable upper tape guide drum on which video heads 5, 5 are attached at a distance of 180 degrees.
The upper tape guide drum 4 has a pulley 4A and a drive source M.
The tape 3 is rotated at a speed of, for example, 1800 rpm by a driving source (for example, a motor) via a belt 6 hung on the shaft 5A of the tape 3, and the tape 3 runs at a predetermined speed via the post 3A.

In a magnetic recording/reproducing apparatus, it is necessary to perform various characteristic tests, and it becomes necessary to frequently replace the upper tape guide drum 4 equipped with the video head 5 while the magnetic tape 3 is still loaded in the tape running path. At that time, if you replace the magnetic tape 3 while it is still loaded in the tape running path, the magnetic tape may be scratched by the upper tape guide drum 4, or your hand may touch it and leave hand oil etc. on the magnetic surface of the magnetic tape 3. Since the upper tape guide drum 4 is often contaminated, the upper tape guide drum 4 must be replaced when no magnetic tape 3 is loaded on the running path. Therefore, if the upper tape guide drum 4 is frequently replaced during the characteristic test, the magnetic tape 3 must be repeatedly loaded and rewound, which not only results in poor operability but also increases the working time. It had the disadvantage that the function stopped every time it was replaced, resulting in extremely poor efficiency in inspections, etc.

The present invention eliminates the above-mentioned drawbacks, and makes it possible to remove the magnetic tape from the upper tape guide drum using an operating member while the magnetic tape is loaded in the tape running path, and to replace the upper tape guide drum without damaging the magnetic tape. The object of the present invention is to obtain a tape guide device configured as follows.

The present invention will be explained based on the drawings.

FIG. 2 is a plan view of the embodiment of the present invention when the tape is running, FIG. 3 is a partially sectional front view, and FIG. 4 is a plan view of the embodiment of the present invention when the tape is stopped running. Figure 5 shows a front view with the tape removed.

In FIGS. 2 to 5, the same reference numerals as in FIG. 1 correspond to the same parts. 7 is a rotating disk, 8,
Reference numerals 8 and 8 denote holding rollers fixed to the substrate 2, and the rotating disc 7 is rotatably held at the lower part of the lower tape guide drum 1 by the holding rollers 8, 8, 8.
9 is a fixed tape guide pin, 10 is a gear, and the fixed tape guide pin 9 and the gear 10 concentric with the rotating disc 7 are integrally fixed to the rotating disc 7.

11 is a tape guide plate, 12 is a tape guide rod, 13 is a moving table, 14 is a long groove, 15 and 16
indicates a retaining pin.

The rotating disk 7 is also provided with a moving table 13 to which a tape guide plate 11 and a tape guide rod 12 are fixed. The tape guide plate 11 is held by a holding pin 15 and the moving base 13 is held by a holding pin 16 so as to be slidable in the circumferential direction. Here, the tape guide plate 11 and the moving table 1
3 constitutes an operating member, and a tape guide rod 12, holding pins 15 and 16, stoppers 22 and 23, etc. constitute positioning members. 17 is a drive motor for the rotating disc 7; 18 is a drive gear; the gear 10 is connected to the drive gear 18 coupled to the drive motor 17;
The rotational force of the drive motor 17 is transmitted to the rotating disk 7.

A holding pin 19 is fixed to the substrate 2 and rotatably holds the holding roller 8 of the rotary disk 7;
0, 20 are tape guide posts, 21 and 22
23 is a stopper of the moving table 13, and 23 is a stopper of the tape guide plate 11.

As shown in FIGS. 2 and 3, during recording and reproduction in the tape guide device according to the present invention, the magnetic tape 3 is connected to the upper tape guide post 20, the left semicircumferential portion of the tape guide drums 1 and 4 (see the drawing), and It runs in the order of the lower tape guide post 20.
In this case, the tape guide plate 11 fixed to the rotary disk 7 is arranged at a non-contact portion of the magnetic tape 3 (in the drawing, along the right semicircumference of both tape guide drums 1 and 4). Therefore, tape guide plate 1
1 has no effect on the running of the magnetic tape 3.

When recording or reproduction is finished and the upper tape guide drum 4 is replaced, the drive motor 17 is rotated counterclockwise (in the direction of the dotted line in the figure). The rotational force of the drive motor 17 is transmitted to the gear 10 via the drive gear 18, and the rotary disk 7 rotates clockwise, and the fixed tape guide pin 9 and the tape guide plate 1
1 and tape guide rod 12 both rotate clockwise. The tape guide plate 11 holds the magnetic tape 3 until the holding pin 15 is stopped by the stopper 23.
and both tape guide drums 1 and 4,
The tape guide rod 12 on the movable base 13 is connected to the movable base 1
The three holding pins 16 rotate together with the rotating disk 7 until they are stopped by the stopper 22. Thereafter, the holding pins 15 and 16 remain stationary due to the stopper 22, and slide in the form of rotating in the long groove 14, and only the rotating disk 7 continues to rotate. When the fixed tape guide pin 9 fixed to the rotary disk 7 rotates to a predetermined position, for example, the position of the stopper 21, the predetermined position is detected by a detection means such as a micro switch and the drive motor 17 is stopped.

4 and 5 show the drive motor 17 mentioned above.
It is a figure explaining the state at the time when counterclockwise rotation of has ended. In this case, the magnetic tape 3 is guided by the fixed tape guide pin 9, the tape guide plate 11, and the tape guide rod 12 (as clearly shown in FIG. 4), and the tape guide plate 11 is guided by the tape guide drums 1 , 4 and the magnetic tape 3, and the magnetic tape 3 is completely separated from the drums 1, 4 to the outside. If the magnetic tape 3 is completely detached from the upper tape guide drum 4, even if the upper tape guide drum 4 is replaced, the magnetic tape 3 will not be touched or damaged. There is no need to worry about any negative effects. After replacing the upper tape guide, if the drive motor 17 is rotated clockwise, the rotating disk 7 will rotate in the opposite direction to the above-mentioned rotation together with the tape guide plate 11 and the tape guide rod 12. The state returns to the state shown in the figure and FIG. At this time, by applying a light winding torque to the take-up reel or supply reel (not shown) to take up the slack in the magnetic tape 3, the magnetic tape 3 is completely moved to its original running position on the tape guide drum. , so it is possible to immediately start recording or playback.

As explained above, in the present invention, the tape guide plate, which is held at the lower part of the lower tape guide drum and is fixed to the rotatable disc provided in a freely rotatable manner, is connected to the tape and the tape guide drums 1 and 4 when the magnetic tape is running. When the tape stops running, the tape guide plate is rotated to the position where it is detached from the tape guide drums 1 and 4, so that (1) the magnetic tape remains loaded on the running path; It does not damage or stain the magnetic tape, (2) the upper tape guide drum can be replaced easily, and (3) the upper tape guide drum can be easily replaced for operation such as video head characteristic testing equipment that requires frequent replacement of the upper tape guide drum. It produces effects such as significantly improving the efficiency of testing and testing.

[Brief explanation of the drawing]

FIG. 1 is an explanatory view of the main parts of a conventional tape guide device, FIG. 2 is a plan view showing the state of the tape guide device of the present invention during tape running, FIG. 3 is a front view of the same part in cross section, and FIG. This figure also shows a plan view showing the state when the tape is stopped running, and FIG. 5 shows a front view with the tape removed. 1: Lower tape guide drum, 4: Upper tape guide drum, 7: Rotating disk, 8: Holding roller, 9:
Fixed tape guide pin, 10: Gear, 11: Tape guide plate, 12: Tape guide rod, 13: Moving table, 14: Long groove, 15, 16: Holding pin, 21,
22: Stopper of the moving table 13, 23: Stopper of the tape guide plate.

Claims (1)

[Claims] 1. A rotating disk having a diameter larger than that of the video head cylinder is rotatably provided at the lower part of the lower tape guide drum of the video head cylinder, and the rotating disk has a tape guide that can freely slide in a long groove provided in the rotating disk. A moving stage having a rod and a tape guide plate having an arc-shaped side plate are installed, a fixed tape guide pin is provided near the end of the long groove on the rotating disk, a driving source is connected to the rotating disk, and recording, During playback, the tape guide rod, tape guide plate, and fixed tape guide pin are arranged in non-contact positions with the magnetic tape, and when replacing the upper tape guide drum after recording and playback, the drive source moves the rotating disk. drive,
A tape guide for a magnetic recording and reproducing device, wherein the moving table and the tape guide plate are slid, and the magnetic tape is held at a position separated from a video head cylinder by the tape guide rod, the tape guide plate, and the fixed tape guide pin. Device.