JPH058731U - Tape guide drum - Google Patents

Abstract

(57) Abstract: In OBJECTIVE called M Rohde _Lee ring system VTR, when the tape is pulled out, in the course of the magnetic tape is wound around the tape guide drum, the tape lower edge portion when the tape is run on the tape guide step portion Reduces tape damage. [Structure] In a tape guide drum 5 having a guide step portion 6a for slidingly guiding the lower end of a magnetic tape on an outer peripheral surface 5a, the wound magnetic tape is separated from the tape guide drum 4, and the guide step is provided on the tape outlet side. The collar portion 6 having the inclined portion 6b is formed continuously with the portion 6A.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a magnetic tape guide drum of a rotary head type magnetic recording / reproducing apparatus.

[0002]

[Prior Art]

Figure 5 is a plan view showing a Tepurode _Lee ring mechanism of a so-called M Rohde _Lee ring system. In the figure, the magnetic tape T is pulled out from the cassette 3 by the tape pull-out members 1 and 2, and is wound around the tape guide drum 4 by a predetermined angle.

[0003]

[Problems to be solved by the device]

In the shape of the tape guide drum 4 described above, when the magnetic tape T is wound around the drum 4, the magnetic tape T _{1 in the} shaded area shown in FIG. The lower end of the magnetic tape is damaged. 7 to 8 are for explaining the state. That is, the magnetic tape T approaches the drum 4 (see FIG. 7A), and the magnetic tape T contacts the outer peripheral surface 4b of the drum 4 below the guide step 4a (see FIG. 7B).

Further, the magnetic tape T abruptly rises on the outer circumference of the drum 4 and also contacts the inner tape surface 4c of the drum 4 (see FIG. 8A). Further, the magnetic tape T ascends while sliding on both sides of the tape guide surface 4c and the outer peripheral surface 4b, and the lower end of the magnetic tape T rides on the guide step portion 4a of the drum 4 (see FIG. 8B). At this time, the lower end of the magnetic tape T rubs against the edge of the guide step 4a of the drum 4 and is damaged.

[0005]

[Means for Solving the Problems]

 In a tape guide drum having a guide step portion for slidingly guiding the lower end of the magnetic tape on the outer peripheral surface, the wound magnetic tape is continuously inclined to the guide step portion on the tape outlet side away from the tape guide drum. The collar portion is formed.

[0006]

[Action]

 According to the configuration of the present invention, when the magnetic tape is wound around the tape guide drum, the lower end of the magnetic tape first rides on the flange portion, and then gradually rises along the sloped surface of the guide step portion of the tape guide drum. It is lifted up to the end and the lower end of the magnetic tape is naturally guided to the guide step.

[0007]

【Example】

 FIG. 1 is a front view of the tape guide drum of the present invention, FIG. 2 is a plan view of an apparatus adopting the tape guide drum of the present invention, and FIGS. 3 and 4 show a state in which a magnetic tape is wound around the tape guide drum. It is a partial cross-sectional view for doing. In the figure, the same parts as those in the conventional example are designated by the same reference numerals, and the description thereof will be omitted.

In FIG. 1, reference numeral 5 is a tape guide drum, and a flange portion 6 is formed on the tape outlet side. The collar portion 6 is formed in a shape which is continuously inclined to the edge of the tape guide step portion 5a. The collar portion 6 is preferably formed integrally with the tape guide drum 5, but may be formed separately and joined to the drum 5. As shown in FIG. 1, the tape-en Rohde _Lee ing state where the magnetic tape T is contained in the cassette 3, the distal end portion of the flange portion 6 is projected to the lower surface of the magnetic tape T.

Accordingly, the Tepurode _Lee ring is started, pull out the magnetic tape T from the tape pull-out members 1 painter set 3, wound constant angle Tokoro the magnetic tape T in the tape guide drum 5, but first tape T The lower end of the magnetic tape T abuts the inclined surface 6a from the state of being located above the inclined surface 6a of the collar portion 6 (FIG. 3 (a)) (FIG. 3 (b)). Subsequently, the lower end of the magnetic tape T moves up while sliding on the inclined surface 6a (FIG. 4 (a)).

Finally, the magnetic tape T rides on the guide step 5a of the tape guide drum 5, and the magnetic tape T contacts the tape guide surface 5b of the drum 5 (FIG. 4 (b)). Since the inclined surface 6a of the collar portion 6 is formed continuously with the edge portion of the guide step portion 5a as described above, when the magnetic tape T rides on the guide step portion 5a, the lower end of the magnetic tape T is damaged. Fears of being affected are reduced.

[0011]

[Effect of the device]

The configuration of the tape guide drums of the present invention, the effect of tape damage received the magnetic tape lower end at Tepurode _Lee ring is reduced.

[Brief description of drawings]

FIG. 1 is a front view of a tape guide drum of the present invention.

2 is a plan view of Tepurode _Lee ring apparatus of the present invention.

FIG. 3 is a view for explaining the relationship between the tape guide drum of the present invention and a magnetic tape.

FIG. 4 is a view for explaining the relationship between the tape guide drum of the present invention and a magnetic tape.

5 is a plan view of Tepurode _Lee ring device of the conventional example.

6 is a front view of Tepurode _Lee ring device of the conventional example.

FIG. 7 is a diagram for explaining a relationship between a conventional tape guide drum and a magnetic tape.

FIG. 8 is a diagram for explaining a relationship between a conventional tape guide drum and a magnetic tape.

[Explanation of symbols]

 5 Tape guide drum 5a Guide step 5b Tape guide surface 6 Collar 6a Sloping surface

Claims (1)

[Claim 1] A tape guide drum having a guide step portion on the outer peripheral surface for slidingly guiding the lower end of the magnetic tape, wherein the wound magnetic tape is separated from the tape guide drum. A magnetic tape guide drum, characterized in that a flange portion is formed on the outlet side so as to be continuous with the guide step portion.