JPH0196854A - Rotary head type drum unit for recording or reproducing device - Google Patents

Abstract

PURPOSE:To prevent a cassette from touching a drum even when the cassette is brought close to the drum, to secure the mutual positional relation of the cassette and the drum, and to miniaturize a drum unit by notching the upper fixed part of the drum, making the notched part into an upper drum and making the part of the upper drum enter the cassette. CONSTITUTION:The drum unit is composed of an upper drum 1, a rotary transformer 2, a lower drum 3, a head chip 4, a cassette 5, a tape 6, a drum motor 7, a shaft 8, an upper and lower drum fixing block 9, a drum shaft 10, a magnet 11, and a stator 12. When the tape 6 is traveled, in order to make the part of the drum unit enter under the cassette 5, the drum unit is notched so that the upper drum 1 never touches the cassette 5 at the time of the completion of tape loading.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a rotary head type drum unit for a recording or reproducing device.

[Prior Art] Recording or reproducing apparatus, especially 8. VTRs (magnetic recording and reproducing devices) are required to be compact, and in these VTRs, the cassette that stores the tape, which is the distribution medium, and the drum may unexpectedly come into contact with each other. The cassette and rotating head drum (hereinafter referred to as the drum) were mounted on the chassis in a safe position with sufficient distance to prevent damage to the cassette.

FIG. 3 schematically shows a drum unit of a conventional VTR, with FIG. 3(a) showing a plan view and FIG. 3(b) showing a side view. In FIG. 3, la is a drum, 5 is a cassette, 6 is a tape, 13 is a capstan, 14 is a capstan motor that rotates the capstan, 15 is a pinch roller, 1
6 is a tension post, and 17 is a guide post.

In the configuration shown in FIG. 3, the tape 6 or cassette 5 is pulled out from one winding shaft by the rotation of the drum la and capstan 13, and after recording or reproduction is performed, it is wound onto the other winding shaft. At this time, a certain distance @ L2 is maintained so that the drum la does not touch the cassette 5.

[Problems to be solved by the invention] The conventional rotating head type drum unit as described above has the following problems:
Because the cassette and drum were mounted on the chassis in a safe position with a sufficient distance between them, the problem was that the entire device became larger. Also, is there a way to mount the cassette on a moving chassis and move the cassette and guide rail closer to the drum to reduce the depth?If they are too close together, the drum and cassette will come into contact with each other, so I would like to know if there is a way to avoid that contact. It was unavoidable that it would be thicker to some extent, and there were problems with making it smaller and lighter.

The present invention was made in order to solve this problem, and an object of the present invention is to provide a small and thin drum unit that does not come into contact with the drum even when the cassette is brought close to the drum, has a mutually safe positional relationship, and is small and thin. do.

[Means for Solving the Problems] In order to achieve the above object, the drum unit of the present invention is provided by cutting out the upper fixed part of the drum of a rotary head type drum unit to form an upper tram, and inserting the upper tram into a cassette. It is a structure like this.

[Function] By having the above configuration, when the tape rope ink is completed, it is possible to maintain a positional relationship such that a part of the drum enters the bottom of the cassette, and the entire device is thin and has a small depth. Become something.

[Embodiment] Fig. 1 is a diagram schematically showing an embodiment of a drum unit of the present invention, in which Fig. 1(a) is a side sectional view, Fig. 1(b) is a plan view, and Fig. 1(c) is a plan view. In the side view, 1 is the upper tram, 2 is the rotary transformer, 3 is the lower tram, 4 is the head chip,
5 is a cassette, 6 is a tape, 7 is a drum motor, 8 is a shaft, 9 is an upper drum fixing block, 10 is a drum shaft, 11 is a magnet, and 12 is a stator.

Further, the same reference numerals as in FIG. 3 indicate the same or corresponding parts.

In addition, FIG. 2 shows the tape running path in the drum unit of FIG. 1, and FIG. 2(a) is a plan view, and FIG.
b) is a front view of the drum shown in FIG. 3(a), and FIG. 3(c) is a side view of the drum shown in FIG. 3(a), where the same reference numerals as in FIGS.

In Fig. 2, when the tape 6 is traveling as described in Fig. 3, the drum unit partially enters under the cassette 5, so the upper drum l is cut so that it does not hit the cassette 5 when tape loading is completed. It's missing. and,
Comparing FIG. 2, which is an embodiment of the present invention, and FIG. 3, which is a conventional example, it can be seen that the distance #L from the lower end of the cassette 5 to the upper end of the drum unit is significantly shortened.

[Effects of the Invention] As explained above, the present invention cuts out the part of the upper tram which is a fixed part that does not come into contact with the tape.
By bringing the drum unit and tape cassette closer together, it became possible to significantly reduce the size and weight of recording or playback equipment.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing an outline of an embodiment of the drum unit of the present invention, Fig. 2 is a diagram showing a tape running path in the drum unit of Fig. 1, and Fig. 3 is a diagram showing an outline of a drum unit of a conventional VTR. FIG. In the figure. l: Upper drum 2: Rotary transformer 3: Lower drum 4: Het tip 5: Cassette, 6: Tape 7: Tram motor 8, Shaft 9: Upper drum fixed block E0/Drum shaft ll: Magnet 12: Stator agent Patent attorney 1) Haru Kitatake Figure 1

Claims (1)

[Claims] A rotary head type drum unit for a recording or reproducing apparatus, characterized in that the upper fixed part of the drum of the rotary head type drum unit is cut out to form an upper drum, and a part of the upper drum can be inserted into a cassette.