JPH0229555Y2 - - Google Patents

Description

[Detailed explanation of the invention] Technical field This invention is a videotape recorder (hereinafter referred to as
This paper relates to improvements in tape loading devices for VTRs, etc.

BACKGROUND ART There is a VTR in which a tape is wound around a rotating drum using an M loading method. In this M loading method, the tape is wound around the rotating drum according to the following procedure.

First, the cassette is loaded into a predetermined position so that the loading post enters the space formed at the end of the cassette. Next, the loading post moves along a guide groove provided in the chassis base, and the tape is wound around the rotating drum in an M-shape. In this manner, after the tape is loaded into a predetermined tape path, recording and playback operations are performed as is well known. Also, when the cassette is removed from the VTR, the tape and loading post operate in the opposite manner to that described above.

When attempting to reduce the size and weight of a VTR in which the tape is pulled out from the cassette and then stored again using the M loading method, the following problems arise.

In other words, as tapes become smaller, the loading path for the tape is closer to the rotating drum, which results in poorer contact between the tape and the full-width erasing head or impedance roller placed along the tape running path. , good recording,
Audio recording and playback operations are no longer possible.

Therefore, by changing the arrangement of the loading posts, the loading path can be completely erased by eliminating the entire width of the head.
It is conceivable to make the best possible contact between the audio head etc. and the tape. For example, a rotating arm is pivotally attached to a post base that supports a loading post, a guide post is provided at one end of the rotating arm, and the guide post is moved to a predetermined position around the fulcrum of the rotating arm just before tape loading is completed. Rotate the angle. By changing the loading path in this way, it is possible to optimize the contact between the full width erase head, audio head, etc. and the tape. According to this, the above-mentioned problems associated with the reduction in size and weight of the VTR can be solved to some extent, but the following problems remain.

That is, there is a small gap between the rotating arm supporting the guide post and the shaft pivotally attached to the post base, which is necessary for relative movement between the two. Therefore, when the tape loading is completed, the first
As shown in the figure, even if an attempt is made to fix the rotary arm 1 with the stopper 3, the above-mentioned gap causes the rotary arm 1 to wobble vertically as shown by the arrow 100 in the figure. In other words, the position of the guide post is indicated by arrow 1.
As shown by 01, it is not determined. As a result, there remains the problem that track deviation occurs when the tape is brought into contact with each of the above-mentioned heads each time loading is performed. Furthermore, there is another problem in that the slight twist of the tape that occurs during this process makes it difficult to run the tape, making it impossible to run it accurately along the circumferential surface of the rotating cylinder. Therefore, reproducible recording and playback operations cannot be performed.

Disclosure of the invention This invention was made to solve the above-mentioned problems, and it is possible to reproducibly move the tape guide post attached to one end of the rotating arm attached to the tape guide means at the tape loading completion position. The purpose of the present invention is to provide a mechanism that can accurately position the tape at a predetermined position, maintain stability in tape running, and reduce the size and thickness of the tape running system.

In order to achieve this purpose, this invention has a rotating arm pivotally connected to a post base that supports a vertical post and an inclined post, and a guide member provided on a pair of left and right tape guide means, and a rotating arm that is erected at one end of the rotating arm. The positioning means is provided near the end of the guide groove on both sides of the rotating drum, and the positioning means is provided with a recess that corresponds and engages with the rotating arm of the guide member, and the recess and the arm When tape loading is completed, the guide member is rotated by a predetermined angle in an outward direction with respect to the drum by corresponding engagement with the drum, and is positioned and held at the rotated position.

According to this invention, when loading of the tape is completed, the recess of the positioning member and the rotary arm engage, so that the guide post is correctly fixed at a predetermined position with reproducibility. Therefore, it is possible to eliminate phenomena such as twisting of the tape, which conventionally occurs due to minute fluctuations in the position of the guide post at the tape loading completion position. As a result, the full-width erasing head, audio head, etc. disposed along the tape running path are in good contact with the tape, and the tape can always be run stably along the circumferential surface of the rotating drum. In other words, stable recording at all times,
Can record and play. Furthermore, in the present invention, the pair of left and right tape guide means supporting the vertical post and the inclined post move together with the guide member on the reference base parallel to the base surface, and the end of the guide groove is parallel to the base surface. It is positioned and held in a certain state. Furthermore, upon completion of loading, the tape is forced outwardly outwardly relative to the rotating drum by the guide member. Therefore, the full-width erasing head, ACE head, etc. arranged in the tape running system can be placed further inside the drum, and the upper and lower thicknesses can be set to be as thin as possible. As a result, devices can be made smaller and thinner. Also, since only the vertical post rotates when the tape is running, and the inclined post remains stationary at a fixed position on the side of the rotating drum, there are no factors that inhibit the stability of tape running due to the posts, and the stability of tape running is maintained. be able to.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, one embodiment of the invention will be described in detail with reference to the drawings from FIG. 2 onwards.

FIG. 2 shows the main parts of a VTR tape loading device to which this invention is applied. In the figure, supply and take-up reel stands 11 and 12 are provided at predetermined positions on a chassis base 10, and a tape cassette 13 containing tape is loaded onto the reel stands 11 and 12. tape cassette 1
A rotary drum 14 equipped with a video head is disposed at a predetermined position in front of the drum 3 (at the top in the figure), and a tape 15 pulled out from the cassette 13 is wound around the circumferential surface of the drum 14.

A pair of guide grooves 2 are provided on both sides of the rotating drum 14.
01 and 202 are formed in a shape that curves outward from below the front end of the cassette loading position, that is, below the front end space of the cassette 13, toward the front of the apparatus so as to surround the rotating drum 14 from both sides.

A full-width erasing head 3 is placed at a predetermined position on the left side of the rotating drum 14, sandwiching the guide groove 201 on the tape supply side.
0, an impedance roller 31 is provided in front of it. On the other hand, the guide groove 20 on the tape winding side
An audio erasing head 32 and an audio/control head 33 are arranged side by side at a predetermined position on the right side of the rotating drum 14 with the audio recording head 2 in between. These heads and impedance rollers are arranged along a predetermined tape path and come into sliding contact with the magnetic surface of the tape when the tape is running. The above guide grooves 201, 20
2, a supply-side tape guide 40 and a take-up-side tape guide 41 are installed as a pair on the left and right. The tape guides 40 and 41 are connected to the guide grooves 201 and 202.
By moving the tape 15 along the tape cassette 13 loaded therein, the tape 15 is drawn out and wound around the circumferential surface of the rotating drum 14. That is, loading is performed. Also, conversely, the tape guides 40, 41
The tape is stored in the cassette 13 by moving it along the guide grooves 201 and 202 in the opposite direction to that described above. That is, it can be unloaded.

The tape guide 41 is constructed as shown in FIG. Since the tape guides 40 and 41 have a symmetrical structure, hereinafter, for convenience of explanation, the tape guide 41 on the winding side, which is located on the right side of the rotating drum as shown in FIG. 2, will be mainly explained.

The tape guide 41 is a flat post base 4.
11, an inclined post 413 erected on the front end of the post base 411, a vertical post 414 erected on the outside of the slanted post 413, and a rotating shaft 418 provided on the rear end of the post base 411. A rotatable arm 416 is pivotably connected to the rotary arm 416 and a guide post 417 is erected at the end of the rotary arm 416.
and a spring 419 that is fitted onto the shaft 418 and generates a force that rotates the rotating arm 416 in the side direction of the post base.

A vertical post 414 projects a predetermined length below the post base. And this protrusion 420
and the guide shaft 418 are inserted into the guide groove 202. The lower end of the guide shaft 418 is further reduced in diameter and extends downward from the guide groove 202, and a driving means such as a loading motor (not shown) is connected to the tip thereof. By driving this drive means, both tape guides 40 and 41 move along guide grooves 201 and 202. That is, loading or unloading of the tape is performed.

One end of the spring 419 is engaged with a stopper pin 421 provided on the post base 411, and the other end is engaged with a stopper pin 421 provided on the rotating arm 416.
22.

The rotating arm 416 is located on the outside of the post base 411 with respect to the rotating drum 14 together with the guide post 417, and is configured to rotate outwardly at a predetermined angle about the guide shaft 418 against the force of the screw 419. There is.

The configuration of the tape guide 40 is also similar to that of the tape guide 41.

Both tape guides 40, 4 configured in this way
1 moves between the starting end A and the ending end B shown in FIG. 2 along the guide grooves 201 and 202 by operating the driving means as described above.

On the other hand, a positioning member 50 for rotating the rotating arms 406, 407 of the tape guides 40, 41 is placed at a predetermined position near the end of the guide grooves 201, 202.
A pair of 51 are provided.

The positioning member 51 (one positioning member 50 has a symmetrical structure with the member 51, so its explanation will be omitted) is such that the tape guide 41 is aligned with the guide groove 2.
02, the rotating arm 41
It comes into contact with one side of 6. That is, the rotating arm 4
16 begins to rotate in the outer direction of the tape guide 41, that is, in the direction away from the rotating drum 14.

As shown in FIG. 4, the positioning member 51 is approximately L.
It has a shape. The recess 511 that engages with one side of the rotary arm 417 is located at a predetermined height from the chassis base 10 of the positioning member 51 and has a width d.
and a depth l. The width d is slightly wider than the thickness of the rotating arm 416, and the depth l is set so that the guide post 417 can be correctly positioned at the rotated position when engaged with one side of the rotating arm 416. It is set.

Next, the operation of the tape loading apparatus of the present invention having the above configuration will be explained.

When the tape is not loaded as shown in FIG. 2, the tape guides 40 and 41 are located at the starting ends A of the guide grooves 201 and 202, that is, at the cassette loading position. In this state, tape cassette 13
When the tape guides 40 and 41 are loaded onto the reel stands 11 and 12, the tape guides 40 and 41 are fitted into the spaces 131 and 132 at the front end of the cassette 13.

Next, the driving means is driven to move the tape guides 40, 41 along the guide grooves 201, 202 as shown by arrows 110, 111. As a result, the tape 15 is pulled out in front of the cassette 13 while being stretched between the inclined posts and the vertical posts of the tape guides 40 and 41. (Hereinafter, for the sake of simplicity, only the operation of one tape guide 41 will be explained.) When the tape guide 41 reaches near the end of the guide groove 202, the rotating arm 41 moves as shown in FIG.
6 begins to engage the recess 511 of the positioning member 51 as shown in phantom lines in FIGS. 6 and 7. In this state, the tape guide 41 continues to move toward the terminal end B. And tape guide 4
1 reaches the terminal end B, the rotary arm 41 moves into the recess 5
fully engaged with 11. That is, as shown by the arrow 112 in FIG. 6, the rotary arm 416 rotates at a predetermined angle toward the outside of the tape guide 41, and thereby the tape 15 pulled out as shown by the imaginary line in FIG. is expanded outward of the rotating drum 14, as shown by the solid line in the figure. By the way, when one side of the rotary arm 416 and the recess 511 of the positioning member 51 are engaged, the rotary arm 416 is biased by the spring 419 to the inner wall 512 of the recess 511, as shown by the arrow 113 in FIG. pressed against,
The position is regulated in the moving direction of the tape guide 41.
Furthermore, the upper or lower wall surface 513 or 5 of the recess 511
By positioning the rotary arm 416 by sliding the upper or lower surface of the rotary arm 416 with the guide post 417, the guide post 417 is fixed at a predetermined position with reproducibility every loading.

According to this embodiment, as described above, each time the tape loading operation is performed, the recess 51 of the positioning member 51 is
1, the rotating arm 416, that is, the guide post 417 can be correctly fixed in the above-mentioned rotated position. Furthermore, since the positioning is performed by the engagement between the rotary arm 416 and the recess 511, it is extremely simple.

Therefore, the contact between the full-width erasing head 30, audio head 33, etc., and the tape is ensured with reproducibility each time it is loaded, and since the tape does not become twisted, the circumferential surface of the rotating drum can be correctly aligned. The tape runs and good recording and playback can be performed. On the other hand, when the recording and playback operations of the VTR are completed, the tape guide 41 is moved and returned to its original position along the guide groove 202 by the reverse procedure to that described above. As a result, the engagement between the rotating arm 416 and the positioning member 51 is released, and the rotating arm 416 is moved to the guide post 4 by the bias of the spring 419.
17, it rotates back to the side of the post base 411. Then, the tape guide 41 is connected to the guide groove 20.
The tape pulled out as the tape returns to section A of No. 2 is stored in the cassette 13.

[Brief explanation of the drawing]

Fig. 1 is a partial perspective view showing the positioning structure of a conventional guide post, and Fig. 2 is a partial perspective view showing the positioning structure of a conventional guide post, and Fig. 2 is a diagram to which this invention is applied.
A plan view of the main parts of the VTR, FIG. 3 is a perspective view showing an example of a tape guide constituting the loading device of the present invention, FIG. 4 is a perspective view of an example of the positioning member in the device of the present invention, and FIG. 5 is an operation of the device of the present invention. FIG. 6 is a plan view of the main part, and FIG. 7 is a perspective view of the main part explaining the operation of the present device. 14... Rotating drum, 201, 202... Guide groove, 13... Tape cassette, 15... Tape, 40, 41... Tape guide (means), {40
3,413... Inclined post, 404,414...
Vertical post} Loading post, {406,4
16... Rotating arm, 407, 417... Guide post} Guide member, 50, 51... Positioning member (means), 501, 511... Recess.

Claims (1)

[Scope of utility model registration request] a vertical post and an inclined post for pulling out the tape stored in a tape cassette along guide grooves formed on both sides of the rotating drum and wrapping it around the circumferential surface of the rotating drum; and a tape guided near the end of the guide groove. A tape loading device comprising a pair of left and right tape guide means comprising a guide member that rotates at a predetermined angle in the outer direction of the rotating drum so as to further expand the tape in the outer direction of the rotating drum,
The guide member includes a rotary arm pivotally attached to a post base that supports the vertical post and the inclined post, and a guide post erected at one end of the rotary arm, and includes a guide member located near the terminal ends of the guide grooves on both sides. positioning means are respectively disposed in the positioning means, each of the positioning means is provided with a recess that corresponds to the rotating arm of the guide member, and the corresponding engagement with the recess positions the guide member in the outward direction in a predetermined direction when tape loading is completed. A tape loading device that rotates an angle and maintains the tape at the rotated position.