KR100229390B1 - Ground device of a head drum assembly - Google Patents

Abstract

The present invention discloses a grounding device of a head drum assembly.

In the conventional grounding device of the head drum assembly, since the bracket, ground and tension plate, and the contactor are used for the ground of the head drum assembly, the assembling process is complicated and cumbersome, which lowers the assembly of the product and increases the number of assembly parts. Due to this, the production cost of the product is increased, and the bracket is installed on one side of the upper surface of the deck by limiting the space utilization, which causes a problem in miniaturization and light weight of the product.

The present invention is formed so that the neck has a groove so that the diameter of the upper and lower ball bearings mounted on the shaft hole of the lower drum is smaller, the first and second planes on both sides of the neck are formed along the axial direction, A shaft formed through the fixing hole through the first and second planes of the neck; A plate spring of the conductor mounted on the neck to allow elastic deformation by centrifugal force generated during rotation of the shaft; An elastic deformation of the plate spring constitutes a contactor mounted to be in contact with the inner wall of the shaft hole. Therefore, since it is manufactured in a simple configuration and structure in which a contact plate and a contact plate is mounted to the shaft hole of the lower drum, the assembly process is easy and simple, not only the assemblability of the product is remarkably improved but also the number of assembly parts is reduced The production cost of the product is reduced, and it is possible to easily reduce the size and weight of the product.

Description

Grounding device of the head drum assembly

The present invention relates to a head drum assembly, and more particularly to a ground apparatus of a head drum assembly for removing static electricity.

In general, a tape recorder such as a video cassette recorder (VCR) or a camcorder (recorder) records video and audio signals on a tape of a cassette running along a certain driving path of the odometer by rotating the head drum assembly. Or play it back.

One example of the head drum assembly of such a tape recorder is illustrated in FIG. 1. The head drum assembly includes an upper drum 10 and a lower drum 11 at the top and bottom of the shaft 12. Are mounted on each. At this time, the upper drum 10 is press-fitted to the shaft 12 and the lower drum 11 is rotatably supported by the upper and lower ball bearings 13 and 14 of the shaft 12. It is mounted on the outer circumferential surface.

In addition, in the space between the upper drum 10 and the lower drum 11, a rotor and stator transformer 15 for transmitting a signal is interposed therebetween so that a constant air gap is maintained. do. Then, two or more video heads 17 are assembled on the lower surface of the upper drum 10, and a drum motor 18 is installed below the lower drum 11. Accordingly, while the upper drum 10 is rotated in response to the drum motor 18 being driven, the recording or reproduction of the video signal is performed by the action of the video head 17.

On the other hand, the head drum assembly is a grounding device for preventing the recording and playback characteristics deteriorate as noise is generated in the video signal due to static electricity generated in the upper drum 10 by the rotation of the upper drum 10. Will be needed.

As shown in FIG. 2, the grounding device of the conventional head drum assembly is provided by fastening a bracket 21 on one side of the upper surface of the deck 20, and the ground plate 22 at the upper end of the bracket 21. Is fitted. An assembly hole 23 is formed at the end of the ground plate 22, and a tension plate (ground plate 24) such as rubber or the like that attaches restoring force is attached to the upper surface of the ground plate 22.

In addition, a contactor 25 is fitted into the assembly hole 23 of the ground plate 22, and the contactor 25 is in contact with the upper surface of the shaft 12. Therefore, the static electricity of the upper drum 10 generated by the rotation of the upper drum 10, etc. is transmitted to the ground plate 22 through the contactor 25 in contact with the shaft 12, and is transferred to the ground plate 22. Static electricity is grounded to the deck 20 through the bracket 21 is removed.

However, in the ground apparatus of the conventional head drum assembly as described above, the assembly process is complicated because the bracket 22, the ground and tension plates 22, 24, and the contactors 25 are used for the ground of the head drum assembly. And as it is cumbersome not only the remarkability of the product is significantly reduced, there is a problem that the production cost of the product is increased due to the increase in the number of assembly parts. In addition, since the bracket 21 is installed on one side of the upper surface of the deck 20 by the fastening, there is a problem that the size and weight of the product is hindered, such as limited space utilization of the deck 20.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned general problems, and an object of the present invention is to provide a grounding device of a head drum assembly capable of removing static electricity by a simple configuration and structure.

1 is a cross-sectional view showing one example of a general head drum assembly,

2 is a perspective view showing a grounding device of a conventional head drum assembly,

3 is a cross-sectional view showing a ground device of the head drum assembly according to the present invention;

4 is a perspective view partially showing a ground device of the head drum assembly according to the present invention;

5A and 5B are a plan view and an operational state diagram, partially showing a ground device of the head drum assembly according to the present invention;

♣ Explanation of symbols for the main parts of the drawing ♣

10: Upper Drum 11: Lower Drum

11a: shaft hole 12: shaft

13,14: upper and lower ball bearing 30: neck

31: groove 32a, 32b: first and second plane

33: fixing hole 40: plate spring

41: fixed part 42: deformed part

43: free end 44: assembly hole

50: contact 51: spherical

A feature of the present invention for achieving the above object is a head drum assembly composed of an upper drum and a lower drum to perform recording or reproducing of a video signal, wherein approximately between upper and lower ball bearings mounted in the shaft hole of the lower drum. The neck is formed to have a groove in the center so that the diameter thereof is small, the first and second planes are formed along the axial direction on both sides of the neck, and the shaft is formed so that the fixing holes penetrate the first and second planes of the neck. and; A plate spring of the conductor mounted on the neck to allow elastic deformation by centrifugal force generated during rotation of the shaft; A grounding device of a head drum assembly comprising contactors mounted to be in contact with an inner wall of a shaft hole by elastic deformation of a plate spring.

Hereinafter, one preferred embodiment of the ground apparatus of the head drum assembly according to the present invention will be described in detail with reference to the accompanying drawings.

3 to 5A and 5B are views for explaining the grounding apparatus of the head drum assembly according to the present invention, the basic configuration of the general head drum assembly described in Figure 1 will be described with the same reference numerals.

First, referring to Figures 1 and 3, the head drum assembly, the upper drum 10 and the lower drum 11 is mounted on the upper and lower portions of the shaft 12, respectively. The upper drum 10 is press-fitted to the shaft 12 and the shaft hole 11a formed at the center of the lower drum 11 is rotatably supported by the upper and lower ball bearings 13 and 14. It is mounted on the outer circumferential surface of (12), wherein the upper and lower ball bearings (13) and (14) are mounted so as to be positioned respectively at the upper and lower portions of the shaft hole (11a).

In addition, in the space between the upper drum 10 and the lower drum 11, the rotor and stator transformers 15 and 16 for transmitting signals are interposed so as to maintain a constant gap with each other. Then, two or more video heads 17 are assembled on the lower surface of the upper drum 10, and a drum motor 18 is installed below the lower drum 11. Accordingly, while the upper drum 10 is rotated as the drum motor 18 is driven, the recording or reproduction of the video signal is performed by the action of the video head 17. At this time, the video signal is the rotor and stator transformer 15. Transmitted by the action of 16.

As shown in FIGS. 3 and 4, the neck is made smaller in the center of the shaft 12 located between the upper and lower ball bearings 13 and 14 in the shaft hole 11a of the lower drum 11. (neck: 30) is formed to have a groove (groone: 31). That is, the diameter of the neck 30 is smaller than the diameter of the shaft 12, and thus the groove 31 is formed between the outer diameter of the shaft 12 and the outer diameter of the neck 30. In addition, first and second planes 32a and 32b are formed on both sides of the neck 30 along the axial direction, and fixing holes 33 are formed in the first and second planes 32a and 32b of the neck 30. ) Is formed to penetrate. The neck 30 of such a shaft 12 can be formed by turning.

On the other hand, the neck 30 of the shaft 12 is mounted with a plate spring 40 capable of elastic deformation due to the centrifugal force generated when the shaft 12 rotates. A fixing portion 41 fitted into the fixing hole 33 of the neck 30 and fixed to one side is formed to be substantially straight. The plate spring 40 extends from the end of the fixing portion 41 so that the deformable portion 42 forms a substantially semicircular shape so as to be wound in a counterclockwise direction along the outer circumferential surface of the neck 30, and the deformable portion 42 The assembly hole 44 is formed in the free end 43 of the. For example, the free end 43 of the deformable portion 42 is a shaft in which the fixing portion 41 of the plate spring 40 is fitted into the fixing hole 33 on the side of the first plane 32a of the neck 30. It is mounted to be positioned in the second plane 32b of the neck 30 while extending in the counterclockwise direction, which is the rotation direction of the 12. Here, the plate spring 40 is made of a conductor.

A contactor 50 is fitted into the assembly hole 44 of the plate spring 40, and the contactor 50 has a spherical surface 51 in contact with the inner wall of the shaft hole 11a. The contactor 50 is mounted inside the groove 31 in an initial state, ie, at the stationary state of the shaft 12, and is mounted so as not to protrude out of the shaft 12, and the contactor 50 is formed of carbon. Is produced by.

Referring to the assembly and operation of the ground device of the head drum assembly according to the present invention as described above are as follows.

As shown in FIG. 5A, the fixing portion 41 of the plate spring 40 is fitted into the fixing hole 33 of the neck 30 and the free end 43 of the deforming portion 42 is fixed to the neck 30. When wound along the outer circumferential surface of the contactor 50 is located inside the groove 31 is mounted in a state that does not protrude out of the shaft 12. In this state, the upper and lower ball bearings 13 and 14 are mounted in the shaft holes 11a of the lower drum 11, respectively, and the shafts 12 are inserted into the inner diameters of the upper and lower ball bearings 13 and 14, respectively. Mount it. At this time, the contactor 50 is located inside the groove 31, and when the neck 30 passes through the inner diameter of the upper ball bearing 13 when the shaft 12 is assembled, the assembly of the shaft 12 is prevented while the interference is prevented. It runs smoothly.

As shown in FIG. 5B, when the upper drum 10 is rotated together with the shaft 12 by driving the drum motor 18, the deformable portion 42 of the plate spring 40 is caused by the centrifugal force of the shaft 12. Elastic deformation in the radial direction of the axis (12). The spherical surface 51 of the contactor 50 contacts the inner wall of the shaft hole 11a by the elastic deformation of the deformable portion 42.

Thus, since the contactor 50 contacts the inner wall of the shaft hole 11a by the rotation of the shaft 12, when static electricity generate | occur | produces in the upper drum 10 by the friction by rotation of the upper drum 10, etc., The static electricity is transmitted to the lower drum 11 by the contactor 50 through the shaft 12 and the plate spring 40, the static electricity transmitted to the lower drum 11 is external, for example drum base (not shown) It is delivered to the deck and effectively removed. This elimination of static electricity prevents noise in the video signal and prevents deterioration of recording and playback characteristics, resulting in improved product reliability.

In addition, the present invention is a plate spring 40 is mounted on the neck 30 of the shaft 12, the lower drum 11 and the shaft 12 is made of a simple configuration and structure, which is grounded by the contactor 50, The assembly process is easy and simple, the assembly of the product is remarkably improved, and the number of assembly parts is reduced, thereby reducing the production cost of the product. In addition, since the plate spring 40 and the contactor 50 are mounted to the shaft hole 11a of the lower drum 11, the ground is performed, thus miniaturizing and reducing the weight of the product, such as the need for the bracket 21 used in the past. It is easily possible.

On the other hand, the above-described embodiment is merely described one preferred embodiment of the present invention, the scope of application of the present invention is not limited to such, and can be changed as appropriate within the scope of the same idea. For example, the shape and structure of each component shown in the embodiment of the present invention can be modified. In addition, the present invention can be widely used for the ground of various rotating bodies in addition to the head drum assembly.

As described above, according to the grounding apparatus of the head drum assembly according to the present invention, since the plate spring and the contactor are mounted on the shaft hole of the lower drum and the contactor is mounted, the assembling process becomes easy and simple. In addition to the remarkable improvement of the assembly, the number of assembly parts is reduced to reduce the production cost of the product, it is possible to easily reduce the size and weight of the product.

Claims (3)

A head drum assembly composed of an upper drum and a lower drum to record or reproduce a video signal, the head drum assembly comprising: The neck 30 is formed to have a groove 31 so that the diameter thereof becomes smaller at approximately the center between the upper and lower ball bearings 13 and 14 mounted on the shaft hole 11a of the lower drum 11. First and second planes 32a and 32b are formed on both sides of the neck 30 along the axial direction, and fixing holes 33 are formed in the first and second planes 32a and 32b of the neck 30. A shaft 12 formed to penetrate; A plate spring (40) of the conductor mounted on the neck (30) to enable elastic deformation by centrifugal force generated during rotation of the shaft (12); Grounding device of the head drum assembly, characterized in that consisting of a contactor (50) which is mounted in contact with the inner wall of the shaft hole (11a) by the elastic deformation of the plate spring (40). The fixing part 41 of claim 1, wherein the fixing part 41 inserted into the fixing hole 33 of the neck 30 and fixed to one side of the plate spring 40 is formed in a substantially straight line. The deformable portion 42 extends to form a substantially semicircular shape so as to be wound in a counterclockwise direction along the outer circumferential surface of the neck 30 from an end thereof, and the contact member 50 is formed at the free end 43 of the deformable portion 42. The grounding device of the head drum assembly, characterized in that the assembling hole (44) is formed is fitted. The head drum as set forth in claim 1, wherein said contact member (50) is mounted so as to be located inside said groove (31) so that said shaft (12) does not protrude out of said shaft (12) in a stationary state. Ground device of the assembly.

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