JPH0433572Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to an Ω loading type video tape recorder.

[Summary of the idea]

In the present invention, a pair of inclined guides each having a magnetic tape height regulating flange at its upper end are placed close to the circumferential surface of a rotating drum, and the magnetic tape is guided by the two inclined guides to rotate. In a video tape recorder using the Ω loading method, the magnetic tape is wound spirally around the circumferential surface of the head drum in an approximately Ω shape with a winding angle of nearly 360°. By configuring one of the inclined guides disposed on the side as a tapered guide with a smaller diameter on the upper end side and a larger diameter on the lower end side, the rotating head hits (contact state) against the magnetic tape on the exit side. While ensuring this, it is possible to prevent the upper edge of the magnetic tape from being damaged due to contact with the height regulating flange attached to the upper end of the inclined guide.

[Conventional technology]

A conventional Ω loading type video tape recorder will be explained with reference to FIGS. 5 to 9.

First, the height regulating flange 2 of the magnetic tape 1,
A pair of inclined guides 4 and 5 are used, each consisting of a cylindrical pin 3 provided at the upper end. Both inclined guides 4 and 5 are arranged close to the circumferential surface 6a of the rotating drum 6 as shown in FIG. 5, and inclined at a stable angle θ with respect to the rotating drum 6 as shown in FIG. ing. The rotating drum 6 includes a fixed drum 7 placed at the bottom and a rotating drum 8 placed on the same axis above the fixed drum 7.
The rotary drum 8 has a plurality of rotating heads 9a, 9b each consisting of a magnetic head (9a is a video head, 9b is a
This is a head for PCM. ) are installed in two stages, upper and lower. The magnetic tape 1 has a double inclined guide 4,
5 to rotate the circumferential surface 6a of the drum 6.
The wire is wound spirally around the wire, with a winding angle of nearly 360°, almost in the shape of an Ω. At this time, both inclined guides 4, 5
is usually called a neck tightening guide, and as mentioned above, it is approximately Ω.
The magnetic tape 1 is arranged so as to tighten the magnetic tape 1 wound in a shape. Further, the magnetic tape 1 is wound around a fixed drum 7 and a rotating drum 8, and the lower edge 1a of the magnetic tape 1 is guided by a tape lead 10 provided on the fixed drum 7. It is configured.

Next, as shown in FIGS. 5 to 7, the magnetic tape 1 is supplied to the drum 6 for rotation from the inclined guide 5 side, and while running at a constant speed in the direction of arrow a to be pulled out from the inclined guide 4 side, the magnetic tape 1 is Rotating drum 8 is rotated at high speed in the direction of arrow b, which is the direction of rotation in the opposite direction to the running direction of tape 1, to rotate the drums 9a, 9.
b is configured to perform desired recording or reproduction. At this time, the magnetic tape 1, which has been given a twist in the vertical direction by both inclined guides 4 and 5, is biased upward (in the direction of arrow c in FIG. 7) with respect to both inclined guides 4 and 5. However, the upper edge 1b of the magnetic tape 1 is
By regulating the height of the magnetic tape 1
The lower edge 1a of the tape lead 10 is in contact with the tape lead 10 when running.

[Problems that the idea should solve]

By the way, conventionally, as shown in FIGS. 9 and 8, rotating heads 9a, 9 are rotated in the opposite direction in the direction of the arrow b with respect to the magnetic tape 1 running in the direction of the arrow a.
b is the side that comes into contact with the magnetic tape 1 first.
Conventionally, the following problems have occurred with respect to one of the inclined guides 4 disposed on the exit side from the rotating heads 9a and 9b of the magnetic tape 1.

That is, on the exit side, the arrow b of the rotating drum 8
Due to the high-speed rotation in the direction, an air entrainment effect occurs, and the magnetic tape 1 is rotated to the ends 9a and 9b.
The contact (contact condition) deteriorates.

Therefore, conventionally, the upper end 4a side of the inclined guide 4 constituted by a cylindrical pin is connected to the rotating drum 8.
By narrowing the gap 11 between the upper end 4a side and the rotating drum 8, an attempt is made to suppress the above-mentioned air entrainment and ensure contact of the rotating heads 9a and 9b with the magnetic tape 1. there was.

However, if the gap 11 is narrowed beyond a certain level in this way, the height regulating flange 2 attached to the upper end 4a of the inclined guide 4 by the screw 12 will be moved from the upper end 4a to the rotating drum 8 side (the 8, the upper edge 1b of the magnetic tape 1 running on the circumferential surface of the inclined guide 4 is attached to the flange 2 by a sufficient length (the length in the direction of the arrow a). ). On the other hand, magnetic tape 1
is under an upward biasing force (in the direction of arrow c in FIG. 8) with respect to the inclined guide 4, and as the contact length of the upper edge 1b with the flange 2 becomes shorter, the contact pressure of the upper edge 1b with the flange 2 decreases. becomes high.

As a result, conventionally, the upper edge 1b of the magnetic tape 1
is in contact with flange 2 more strongly than necessary (arrow a)
High contact pressure per unit area in the direction. )
Moreover, damage such as curling of the edge 1b, deformation in a seaweed shape, or peeling of the magnetic film is likely to occur.

Incidentally, in the earlier application (Japanese Patent Application No. 126751/1982) filed by the applicant of the present invention, a method is proposed for regulating the magnetic tape in the tangential direction to the circumferential surface of the rotating drum 8 on the exit side. Tilt guide 4 for regulating member
By arranging it close to, the above-mentioned air entrainment can be suppressed.

According to this example of the prior application, the gap 11 is enlarged to some extent, and the flange 2 is aligned with the upper end 4 of the inclined guide 4.
a to the rotating drum 8 side to a certain extent, the upper edge 1b of the magnetic tape 1 can be brought into contact with the flange 2 for a certain length of time.
Damage to the upper edge 1b described above can be reduced.

However, in this prior application, a separate member called a regulating member had to be provided separately from the inclined guide 4, which caused a problem that the number of parts and the number of assembly steps increased.

This invention secures contact between the rotating head of the magnetic tape and the magnetic tape on the exit side from the rotating head of the magnetic tape (good contact), and at the same time, the magnetic tape is applied to the height regulating flange attached to the upper end of the inclined guide. The contact length of the upper edge of the tape can be made sufficiently long, and the contact pressure of the upper edge against the flange can be sufficiently reduced.

[Means for solving problems]

In this invention, a pair of inclined guides each having a magnetic tape height regulating flange attached to the upper end are placed close to the circumferential surface of the rotating drum, and the magnetic tape is guided by both inclined guides to rotate. A video tape constructed so that the tape is wound spirally around the circumferential surface of the magnetic tape in an approximately Ω-shape with a winding angle of nearly 360°, and the tape is rotated in a direction opposite to the running direction of the magnetic tape. In a tape recorder, one of the pair of inclined guides, which is disposed on the entrance/exit side from the rotating head of the magnetic tape wound around the rotating head drum, has a smaller diameter on the upper end side and a lower diameter on the lower end side. The taper guide is configured to have a large diameter, and the lower end side of the tapered guide with the larger diameter is brought close to the circumferential surface of the rotating drum, and the upper end side of the tapered guide with the smaller diameter is spaced apart from the circumferential surface of the rotating drum. The video tape recorder is characterized in that the height regulating flange attached to the upper end of the tapered guide largely extends from the upper end of the tapered guide toward the circumferential surface of the rotating drum.

[Effect]

In the present invention, the lower end side of the tapered guide, which has a large diameter and which constitutes the inclined guide arranged on the exit side from the rotating head of the magnetic tape, is brought close to the circumferential surface of the rotating head. Air entrainment due to rotation is suppressed, and contact of the rotating head against the magnetic tape can be ensured.

Moreover, the upper end side of the tapered guide, which has a smaller diameter, is spaced apart from the circumferential surface of the rotating drum.
Since the height regulating flange attached to the upper end of the tapered guide could be extended from the upper end of the tapered guide to the circumferential surface of the rotating drum, the contact length of the upper edge of the magnetic tape with the flange could be made sufficiently long. This makes it possible to reduce the contact pressure per unit area applied to the upper edge due to contact with the flange.

Furthermore, since the taper guide has a larger diameter on the lower end side, which is the opposite side to the upper end flange side, the magnetic tape running around the circumferential surface of the tapered guide has a larger diameter on the lower side with respect to the tapered guide (in the direction away from the flange). ) is generated, and the contact pressure of the upper edge of the magnetic tape against the flange can be actively lowered.

〔Example〕

An example of an Ω loading type video tape recorder to which the present invention is applied is shown in Figs. 1 to 4 below.
This will be explained using figures. Note that the same reference numerals are given to the same structural parts as in the conventional example shown in FIGS. 5 to 9, and the explanation thereof is omitted.

The present invention provides a rotary head 9 for the magnetic tape 1.
One of the inclined guides 4 disposed on the exit side from a and 9b has a smaller diameter on the upper end 21a side and the lower end 2
The tapered guide 21 is formed of a conical pin with a larger diameter on the 1b side.

As shown in FIGS. 1 and 2, the lower end 21b side of the tapered guide 21 is brought sufficiently close to the circumferential surface 6a of the rotating drum 6, and the upper end 21a side of the tapered guide 21 is brought close to the rotating surface 6a of the rotating drum 6. The height regulating flange 2, which is attached to the upper end 21a of the tapered guide 21 by a screw 12 at a sufficient distance from the peripheral surface 6a, is rotated from the upper end 21a of the tapered guide 21 to the peripheral surface 6a of the drum 6. It protrudes from the side in the direction of arrow d in FIG. 1 by a sufficiently large amount l.

In addition, on the lower end 21b side of the tapered guide 21, there are upper and lower sections opposite to the upper and lower rotational heads 9a and 9b to accommodate the amount of protrusion of the rotating heads 9a and 9b + the thickness of the magnetic tape 1. The two-stage concave portions 22a and 22b are connected to the tapered guide 21.
The notch is provided in the tangential direction to the circumferential surface.

Taper guide 2 of the present invention configured as described above
According to No. 1, the lower end 21a side of the tapered guide 21 having a larger diameter is rotated to the peripheral surface 6 of the drum 6.
Since the magnetic tape 1 is placed close to the magnetic tape 1, the air entrainment caused by the high speed rotation in the direction of the arrow b by the rotating drum 8 at the exit side from the rotation ends 9a and 9b of the magnetic tape 1 is suppressed, and the rotation with respect to the magnetic tape 1 is suppressed. It is possible to ensure sufficient contact (good contact) between the heads 9a and 9b.

Moreover, since the height regulating flange 2 protrudes from the upper end 21a of the tapered guide 21 toward the circumferential surface 6a of the rotating drum 6 by a sufficiently large amount l, the upper edge 1b of the magnetic tape 1 relative to the flange 2 is The contact length (length in the direction of arrow a) can be made sufficiently long, and the contact pressure per unit area applied to the upper edge 1b due to contact with the flange 2 can be reduced. Furthermore, since the tapered guide 21 has a larger diameter on the lower end 21b side, the magnetic tape 1 running on the circumferential surface of the tapered guide has a lower diameter with respect to the tapered guide 21 (indicated by the arrow e direction in FIGS. 1 and 4). This biasing force in the direction of arrow e is caused by the tapered guide 21 giving the magnetic tape 1 a twist in the vertical direction. ) is generated, and the contact pressure of the upper edge 1b of the magnetic tape 1 with the flange 2 can be actively lowered.

As a result of the above, the contact state of the upper edge 1b with the flange 2 can be stabilized, and the edge 1b can be prevented from curling, deforming into a wakame-like shape, or peeling off of the magnetic film. Damage can be prevented.

Then, the upper edge 1b with respect to the flange 2
By stabilizing the contact state of the magnetic tape 1, the height of the magnetic tape 1 can be stably regulated by the flange 2. As shown in FIGS. 3 and 4, the lower edge 1a of the magnetic tape 1 can be rotated by The magnetic tape 1 can be run in stable contact with the tape lead 10 of No. 6, and the accuracy of recording or reproducing the magnetic tape 1 by the rotating heads 9a, 9b can be improved.

In addition, as shown in Fig. 1, the taper guide 2
If recesses 22a and 22b are provided on the lower end 21b side of the rotation head 9a and 9b,
Since the lower end 21b side of the tapered guide 21 can be brought as close as possible to the circumferential surface of the rotating drum 6, the aforementioned air entrainment can be suppressed to the maximum, and the rotating parts 9a, 9b relative to the magnetic tape 1 can be brought as close as possible to the circumferential surface of the rotating drum 6.
You can maximize the hit.

Although the embodiments of the present invention have been described above, the present invention is not limited to the embodiments, and various effective changes can be made based on the technical idea of the present invention.

[Effect of idea]

The present invention does not use a regulating member that is a separate member from the inclined guide as in the previous application, but uses only the tapered guide, which is a single part, to control the magnetic field at the inlet side of the rotating head for the magnetic tape. This ensures that the rotating head hits the tape. Therefore, compared to the example of the prior application, the number of parts and the number of assembly steps are extremely small, and although the structure is simple, excellent recording and reproduction can be performed.

However, according to the present invention, the contact length of the upper edge of the magnetic tape with the height regulating flange attached to the upper end of the inclined guide is made sufficiently long, so that the contact length of the upper edge of the magnetic tape with the flange is increased per unit area. Since it is possible to actively lower the contact pressure of the upper edge with respect to the flange, the contact state of the upper edge with the flange can be stabilized, and as in the conventional example, The upper edge may curl due to too strong contact with the flange.
Damage such as wakame-like deformation or peeling of the magnetic film can be prevented.

By stabilizing the contact state of the upper edge with the flange, the height of the magnetic tape can be stably regulated by the flange, and the lower edge of the magnetic tape can stably contact the tape lead of the rotating drum. This makes it possible to improve the accuracy of magnetic tape recording and reproduction using the rotating head.

As shown in the example, if a concave part is provided at the lower end of the tapered guide for relief from the rotating head, the lower end can be brought as close as possible to the circumferential surface of the rotating head drum, and the magnetic The contact of the rotating head against the tape can be further improved.

[Brief explanation of the drawing]

Figures 1 to 4 show an embodiment of the present invention, in which Figure 1 is a side view of the main part, Figure 2 is a plan view of the main part, Figure 3 is a side view of the whole, FIG. 4 is a side view showing the entire unfolded state. Figures 5 to 9
The figures show a conventional example, in which Fig. 5 is an overall plan view, Fig. 6 is an overall side view, Fig. 7 is a side view of the entire unfolded state, and Fig. 8 is a side view of main parts. 9 are plan views of the main parts. Further, in the symbols used in the drawings, 1...magnetic tape, 1b...upper edge of the magnetic tape, 2...
...Flange for height regulation, 3... Flange for height regulation, 4... Inclined guide, 5... Inclined guide, 6...
...Rotating drum, 6a...Surrounding surface of rotating drum, 9a...Rotating drum, 9b...Rotating drum, 21...Tapered guide, 21a...Top end of tapered guide, 21b...Lower end of tapered guide l is the amount of overhang.

Claims (1)

[Claim for Utility Model Registration] A pair of inclined guides, each having a magnetic tape height regulating flange attached to its upper end, is disposed close to the circumferential surface of a rotating head drum, and the magnetic tape is guided by both inclined guides. The magnetic tape is wound spirally around the circumferential surface of the rotating magnetic tape in an approximately Ω-shape with a winding angle of nearly 360 degrees, and the magnetic tape is rotated in a direction opposite to the running direction of the magnetic tape. In the video tape recorder configured, one of the pair of inclined guides, which is disposed on the entrance/exit side from the rotating head of the magnetic tape wound around the rotating head drum, has a smaller diameter on the upper end side. The tapered guide has a larger diameter on the lower end side, and the lower end side of the tapered guide with the larger diameter is brought close to the circumferential surface of the rotating drum, and the upper end side of the tapered guide with the smaller diameter is placed closer to the circumferential surface of the rotating drum. A video tape recorder characterized in that the height regulating flange, which is attached to the upper end of the tapered guide at a distance from the tapered guide, extends largely from the upper end of the tapered guide toward the circumferential surface of the rotary drum.