JPH08180345A - Head drum assembly for tape recorder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an improved head drum assembly in which the assembly process in much more simplified so as to improve the productivity and number of components is decreased to attain a simpler structure. SOLUTION: The head drum assembly 100 has a rotary drum 10 and a stator drum 20, the rotary drum 10 is made up of a base plate 11 and a cylindrical wall 12, a video head 50 is fixed to an upper face 17 of a base plate 11 and a rotor transformer 70 is provided to a lower face 18. A receiving hole 16 in which a rotary shaft 30 is press-fit and received is made at the center, the cylindrical wall 12 is extended upward from the circumferential edge of the base plate 11 and a head window 19 notched to expose the video head 50 externally is formed in the lower part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a head drum for a tape recorder, and more particularly to reducing the number of parts of the head drum and providing a video head on the top surface of the rotary drum to fix the head and adjust the height. The present invention relates to a head drum for a tape recorder in which the assembling efficiency is improved and the assembling efficiency is improved.

[0002]

2. Description of the Related Art A video cassette recorder or a video camera includes a video head, a rotating drum, a fixed drum, and a pair of transformers (transformers) used for recording or reproducing a video signal on a running magnetic tape. )
Have and. Since the head drum assembly has to undergo some precise work in its assembling process, such work is a complicated and time-consuming work in the whole assembling process of the head drum assembly. For example, the work of positioning the video head and the work of adjusting the gap between the transformers are examples. In order to reduce the time required for such work, head drum assemblies of various structures have been conventionally proposed. It was

FIG. 1 shows one of the conventional head drum assemblies for tape recorders. As shown in the figure, the flange drum 4 is press-fitted and fixed above the rotary shaft 6, the rotary drum 1 is fixed on the outside of the flange drum 4, and the rotor transformer 5a is fixed on the lower surface of the flange drum 4.
Are fixed by adhesion or the like. A stator transformer 5b is provided on the top surface of the fixed drum 2 so as to form a gap with respect to the rotor transformer 5a, and a signal from the video head 3 is transmitted through the rotor transformer 5a.

On the other hand, the video head 3 is fixed to the lower surface of the rotary drum 1 by a fixing screw 8 and a set screw 9. The fixing screw 8 fastens the video head, and the set screw 9 is positioned in the vertical direction of the video head. Adjust.

However, the conventional head drum assembly having the above-mentioned structure has a drawback that the assembling process is very troublesome. In particular, the work of mounting the video head on the rotary drum must always be performed before the rotary drum is connected to the fixed drum. That is, since the lower surface of the rotating drum is inaccessible due to the structure after the rotating drum is connected to the fixed drum, the video head must fix the rotating drum to the lower surface by the fixing screw before the drum connection. Further, since the position of the head needs to be finely adjusted with the set screw, there is a problem that an individual complicated work must be performed on the head.

[0006]

SUMMARY OF THE INVENTION Therefore, the main object of the present invention is to provide an improved head drum assembly which can simplify the assembly process and improve the productivity.

Another object of the present invention is to provide a head drum assembly having a simpler structure by reducing the number of parts.

[0008]

In order to achieve the above object, a head drum assembly for a tape recorder according to the present invention comprises a rotary drum, a fixed drum, a rotary shaft, a video head provided on the rotary drum, and A head drum assembly for a tape recorder, comprising a rotating and fixed transformer for transmitting a signal from a video head, wherein the rotating drum comprises a circular bottom surface and a skirt portion, and the video head is fixed to an upper surface of the base plate. Further, the rotor transformer is provided on the lower surface of the base plate, a receiving hole for press-fitting and receiving the rotary shaft is formed in the center of the base plate, and the skirt portion is formed to extend upward from the periphery of the base plate. , A closed notch head window is formed at a lower portion of the video head so that the video head is exposed to the outside. .

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION In carrying out the present invention, female screw holes for receiving video head fixing screws may be formed in the upper portion of the base plate of the rotary drum. Further, it is preferable that the rotary drum has a reinforcing annular rib formed around the rotary shaft receiving hole.

In the head drum assembly according to the present invention, the video head is fixed to the upper surface of the rotary drum, and the rotary transformer is supported on the lower surface of the rotary drum by adhesion or the like. The assembly process is further improved due to the structure that is directly press-fitted into the receiving hole of the rotary drum, and the number of parts is reduced because the flange member used in the conventional head drum assembly is unnecessary. .

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a head drum assembly for a tape recorder according to the present invention will be described in more detail with reference to the drawings.

FIG. 2 shows a sectional view of a head drum assembly for a tape recorder according to the present invention. As shown in FIG. 2, the head drum assembly 100 includes a rotating drum 10 and a fixed drum 20.

The rotary drum 10 comprises a base plate 11 and a cylindrical wall 12. A rotary shaft receiving hole 16 is formed at the center of the base plate 11, the upper end of the rotary shaft 30 is press-fitted and fixed in the receiving hole 16, and the rotor transformer 70 is fixed to the lower surface 18 of the base plate by an adhesive or the like. The rotating shaft 30 is rotatably supported by the bearing 40 with the bearing 40 in a state of being press-fitted and fixed in the receiving hole 16 of the rotating drum 10.

The video head 50 including the head chip 51 and the head base 52 is arranged on the upper surface of the base plate, that is, the mounting surface 17 by the fixing screw 60. The head base 52 and the base plate 11 are formed with female screw holes 63 and 14 through which the fixing screw 60 penetrates and is received.

FIGS. 3 and 4 show a video head exposed to the outside of the head drum assembly 100 mounted on the upper surface 17 of the base plate 11. In order to finely adjust the vertical position of the video head 50 fixed to the upper surface 17 of the rotating drum 10 by the fixing screw 60, a set screw 61 and a screw receiving hole 6 screwed to the set screw 61 are formed in the head base 52. .

By mounting the video head 50 having such a structure, the mounting of the video head and the position adjustment work can be performed at the final stage of the whole assembly process of the head drum assembly 100 as required. That is, as clearly shown in FIG. 4, the base plate 1 on which the video head 50 is mounted is mounted.
Since the upper surface 17 of No. 1 is exposed to the outside, the fixing operation of the video head and the fine adjustment of the vertical position can be performed on the exposed upper surface 17 after the assembly process of the other head drum assembly is completed.

A cylindrical wall 12 extending upward from the peripheral edge of the base plate 11 forms a magnetic tape contact surface of the head drum. The cylindrical wall 12 has a video head 50.
Forms a head window 19 which serves as a passage for accessing the magnetic tape. The head window 19 is formed by cutting off the cylindrical wall 12 at the confluence of the cylindrical wall 12 and the base plate 11. These head windows 19 are formed on each video head 50 so that the head chip 51 is aligned with the outer surface of the cylindrical wall 12.
To house.

A stator transformer 71 is provided on the top surface of the fixed drum 20 provided with the bearing 40, and the video head 50 is provided.
Is transmitted to the stator transformer 71 via the rotor transformer 70 of the rotary drum 10.

The head drum assembly 100 of the present invention has the video head 50 mounted on the upper surface 17 of the rotary drum 10 after the rotary drum 10 is coupled to the fixed drum 20 in consideration of the gap between the two transformers in the assembly process. It is possible to continuously perform the work of fixing and the work of finely adjusting the position.

The foregoing has described only specific embodiments of the present invention, and those skilled in the art can make various modifications within the scope of the claims.

[0021]

Therefore, according to the present invention, in the head drum assembly of the present invention, the video head is fixed to the upper surface of the rotary drum, and the rotor transformer is supported on the lower surface of the rotary drum by adhesion or the like. Further, since the supporting rotary shaft is directly press-fitted into the receiving hole of the rotary drum, the assembling process is further improved, and the flange member used in the conventional head drum assembly is unnecessary and the number of parts can be reduced. .

[Brief description of drawings]

1 is a partial cross-sectional view of a prior art tape recorder head drum assembly.

FIG. 2 is a partial cross-sectional view of a tape recorder head drum assembly according to the present invention.

3 is an enlarged view of a video head and a head window of the head drum assembly shown in FIG.

FIG. 4 is a plan view of FIG.

[Explanation of symbols]

 10 Rotating Drum 11 Base Plate 12 Cylindrical Wall 20 Fixed Drum 30 Rotating Shaft 40 Bearing 50 Video Head 70 Rotor Transformer 71 Stator Transformer 100 Head Drum Assembly

Claims (3)

[Claims] 1. A head for a tape recorder comprising a rotary drum, a fixed drum, a rotary shaft, a video head provided on the rotary drum, and a rotary and fixed transformer for transmitting a signal from the video head. In the drum assembly, the rotary drum is composed of a circular bottom surface and a skirt portion, the video head is fixed to the upper surface of the base plate, the rotor transformer is provided on the lower surface of the base plate, and the center of the base plate is further provided. Form a receiving hole for press-fitting the rotating shaft, the skirt portion is formed to extend upward from the periphery of the base plate, and a closed notch head window is formed in the lower portion thereof so that the video head is exposed to the outside. A head drum assembly for a tape recorder, characterized in that 2. The head for a tape recorder according to claim 1, wherein the same number of female screw holes as the number of video heads are formed in the upper part of the base plate of the rotary drum to receive the screws for fixing the video head. Drum assembly. 3. The head drum assembly for a tape recorder according to claim 2, wherein the rotary drum has a reinforcing annular rib formed around the rotary shaft receiving hole.