JPH07320351A - Magnetic recording / reproducing device - Google Patents

Abstract

(57) [Abstract] [Purpose] In a magnetic recording / reproducing apparatus for recording / reproducing video signals and audio signals on / from a magnetic tape, the height of the magnetic tape is regulated even when a large change in tension occurs in the magnetic tape while the magnetic tape is running. The purpose is to prevent the magnetic tape from coming off from the height regulating member for the upper part of the guide post. [Structure] On the substantially concentric circles of the guide post 3, in the direction substantially perpendicular to the magnetic tape running surface, the guide posts are closer to the magnetic tape than the outer diameters of the upper and lower height regulating members 4 and 5, and more than the thickness of the magnetic tape. A guide post positioning member 6 having a tape dropout prevention portion 7 located at a position away from the post 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording / reproducing apparatus for recording / reproducing video signals and audio signals using a magnetic tape.

[0002]

2. Description of the Related Art A conventional magnetic recording / reproducing apparatus will be described with reference to FIGS.

FIG. 5 is a cross-sectional view of an essential part showing the structure of a conventional tape slip-off preventing member. Reference numeral 3 denotes a guide post for pulling out the magnetic tape 2 from the tape cassette, winding it around a rotating drum, and causing it to run in splint. A guide post upper height restricting member 4 for restricting upward movement of the magnetic tape 2 is provided above the guide post. In addition, a guide post lower portion height regulating member 5 for regulating downward movement of the magnetic tape 2 is provided in the lower portion. Normally, the magnetic tape 2 travels in contact with the cylindrical portion of the guide post 3 and travels while the upward movement of the guide post is restricted by the guide post upper height restricting member 4. The vehicle travels while being restricted from moving downward.

However, when the magnetic tape 2 is used beyond the guarantee limit or when the magnetic tape 2 is damaged due to careless handling, the tension applied to the magnetic tape 2 changes and the magnetic tape 2 is placed above the guide post. The height regulating member 4 may be overcome.

Therefore, in order to prevent the magnetic tape 2 from rising when the magnetic tape 2 rises so as not to come off from the guide post 3 when the tape is passed, a tape pull-out prevention member 8 is provided.

[0006]

However, when the magnetic tape 2 passes over the guide post upper height regulating member 4 when the magnetic tape 2 is applied with an abnormally large tension, as shown in FIG. As shown in 7, the magnetic tape 2 may bend through the gap between the guide post upper height regulating member 4 and the tape removal prevention member 8, and the magnetic tape may be damaged to damage important software. It had an incomplete structure as a slip-out preventing member.

The present invention solves the above problems, and an object of the present invention is to provide a magnetic recording / reproducing apparatus which does not damage the magnetic tape even when the magnetic tape passes over the regulating member.

[0008]

In order to solve the above problems, the present invention is a magnetic recording / reproducing apparatus for recording / reproducing a video signal and an audio signal on / from a magnetic tape, wherein the signal is recorded / reproduced on / from a magnetic tape by a rotating drum. In order to pull out the magnetic tape from the tape cassette and wind it around the rotating drum for adjoining travel, it is integrally provided on the upper part coaxial with the guide post and protrudes from the tape contact surface of the guide post. Height regulating member having a first collar portion and a lower height having a second collar portion integrally provided on the lower portion coaxial with the guide post and protruding from the tape contact surface of the guide post. A tape removal prevention which is located between the regulating member and the upper height regulating member and the lower height regulating member and whose side surfaces are located inside the tips of the first and second flange portions. It is those with a door.

[0009]

With this configuration, even if a large change in tension occurs in the magnetic tape, the magnetic tape contacts the tape removal prevention portion and is regulated, so that it does not get over the guide post upper height regulating member.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a perspective view showing the structure of a magnetic recording / reproducing apparatus equipped with a tape slip-off preventing member according to the present invention. In FIG. 1, reference numeral 1 is a rotary drum fixedly installed on a chassis, 3 is a guide post that is pulled out while regulating the position and height of the magnetic tape 2 so that the magnetic tape 2 travels on the rotary drum 1. A guide post upper height regulating member that is provided integrally with the guide post 3 on an upper portion on the same axis as the guide post 3, and has a diameter larger than that of the guide post 3 and larger than that of the tape contact surface of the guide post 3. It has a protruding brim portion and regulates the upward movement of the magnetic tape 2. Reference numeral 5 denotes a guide post lower height regulating member which is provided integrally with the guide post 3 at the lower portion on the same axis as the guide post 3. It has a brim portion projecting further than the above, and restricts the downward movement of the magnetic tape 2. 6 is a magnetic tape 2
And a guide post positioning portion that positions the guide post 3 so that the guide post 3 is positioned so as to travel alongside the rotating drum 1.
Reference numeral 7 denotes a tape drop-off preventing portion that is formed integrally with the guide post positioning member 6 and is substantially perpendicular to the tape contact surface. 5 and the side surface thereof is located inside the brim portions of the upper and lower height restricting members 4 and 5 of the guide post. FIG. 2 is a cross-sectional view of the main part of FIG. 1, and FIG. 4 is a perspective view of the tape pull-out prevention part 7.

The operation of the magnetic recording / reproducing apparatus of this embodiment constructed as described above will be described below.

First, when the tape cassette is loaded in the apparatus, the guide post 3 guides the magnetic tape 2 to be pulled out of the cassette and abutted against the rotary drum 1, and the guide post 3 is positioned by the guide post positioning portion 6. It

At this time, when the magnetic tape 2 is run in contact with the rotating drum 1 with foreign matter or water droplets adhering to the magnetic tape 2, or when an abnormally large tension acts on the magnetic tape 2, , The magnetic tape 2 is the guide post 3
3, the guide post upper height restricting member 4 restricts the magnetic tape 2 and the magnetic tape 2 separates the magnetic tape 2 from the tape contact surface of the guide post 3 as shown in FIG. Magnetic tape 2 to prevent
Does not come out of the guide post 3.

On the contrary, as shown in FIG. 2, when the tension of the magnetic tape 2 is greatly relaxed, the magnetic tape 2 tries to move downward, but the guide post lower height restricting member 4 restricts it. The magnetic tape 2 is prevented from coming off the guide post 3 because the tape pull-out prevention portion 7 prevents the magnetic tape 2 from being separated from the tape contact surface of the guide post 3.

Further, since it is already known, although not shown, when an abnormally large tension is applied to the magnetic tape in the magnetic recording / reproducing apparatus, the magnetic tape is stored in the cassette after a certain period of time, and the magnetic tape is pulled out again by the guide post to the rotary drum. There is a safety mechanism for splicing and running, and when this safety mechanism works, the tape can be returned to the normal position without damaging the tape.

[0017]

From the above description, the present invention is a magnetic recording / reproducing apparatus for recording / reproducing a video signal and an audio signal on / from a magnetic tape, wherein the magnetic tape is a tape for recording / reproducing the signal on / from the magnetic tape by a rotating drum. A guide post for pulling out from the cassette and winding it around a rotary drum for running in contact is provided, and a first flange portion integrally provided on an upper portion coaxial with the guide post and protruding from a tape contact surface of the guide post. An upper height restricting member, a lower height restricting member integrally provided in a lower portion on the same axis as the guide post, and having a second flange protruding from a tape contact surface of the guide post, and an upper height By providing the tape pull-out prevention portion located between the regulation member and the lower height regulation member and having its side surface located inside the tips of the first and second flange portions, By completely preventing the magnetic tape from coming out of the id post, the magnetic recording / reproducing device will not be damaged due to the change in the tape path that occurs when the magnetic tape comes out of the guide post, and the magnetic tape will also be damaged. Because it does not give, it does not damage important software.

[Brief description of drawings]

FIG. 1 is a perspective view showing a configuration of a magnetic recording / reproducing apparatus according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a main part of a tape drop-out prevention portion of the same embodiment.

FIG. 3 is a cross-sectional view of a main part of a tape slip-out prevention portion of the embodiment.

FIG. 4 is a perspective view of a tape slip-off preventing portion in the embodiment.

FIG. 5 is a sectional view of a main part of a conventional tape removal prevention member.

FIG. 6 is a sectional view of a main part of a conventional tape removal prevention member.

FIG. 7 is a cross-sectional view of a main part of a conventional tape removal prevention member.

[Explanation of symbols]

 1 rotating drum 2 magnetic tape 3 guide post 4 guide post upper height regulation member 5 guide post lower height regulation member 6 guide post positioning portion 7 tape drop prevention portion 8 tape drop prevention member

Claims (1)

[Claims] 1. A magnetic recording / reproducing apparatus for recording / reproducing a video signal and an audio signal on / from a magnetic tape, wherein the magnetic tape is pulled out from a tape cassette to record / reproduce the signal on / from the magnetic tape by the rotating drum. An upper height having a guide post for winding and running on the side of the guide post, and a first collar part integrally provided on an upper part coaxial with the guide post and projecting from a tape contact surface of the guide post. A regulating member, a lower height regulating member integrally provided in a lower portion coaxial with the guide post, and having a second flange portion projecting from a tape contact surface of the guide post, and the upper height regulating member A tape drop-off preventing portion which is located between the member and the lower height regulating member and whose side surface is located inside the tips of the first and second flange portions. And a magnetic recording / reproducing apparatus.