KR100210596B1 - Head drum of vcr and its manufacturing method - Google Patents

Abstract

The present invention relates to a head drum of V-Cal and a method of manufacturing the same, and more particularly, an upper drum 100 is manufactured by a cutting process, a bending process, and a filling process in which a resin is filled, and a lower drum 140. The resin material having the drum portion 142 and the shaft hole 144a is molded to be integrally molded therein. Therefore, such a head drum is manufactured by adding a resin (樹脂) at the same time forming the upper and lower drums using an iron plate, thereby reducing weight and improving manufacturing cost and improving productivity.

Description

V-Cal head drum and its manufacturing method

Figure 1 is a longitudinal cross-sectional view showing the configuration of a conventional head drum assembly.

Figure 2 is a longitudinal cross-sectional view showing the configuration of a preferred embodiment of the head drum assembly according to the present invention.

Figure 3 (a) (b) (c) is a view showing a manufacturing process of the upper drum according to the present invention.

* Explanation of symbols for main parts of the drawings

100: upper drum 102: boss

104: drum portion 106: receiving space

108: filler 120: spindle

140: lower drum 142: drum

144: resin 150: spacer

160: electric motor 180: head base

190: Video Head 200: Rotary Transformer

The present invention relates to a head drum assembly of a BC-AL, and more particularly, to a head drum of a BC-AL and a method of manufacturing the same, which can improve productivity by reducing the weight of the head drum assembly and simplifying the manufacturing process.

In general, a VRC device is a device for recording an image signal on a magnetic recording tape or reproducing a recorded signal. When the device is described schematically, a traveling system for moving a tape along a predetermined path on a main base, A feed reel and take-up reel are provided for supporting the cassette and for driving the tape in the selected direction.

The traveling system is provided with a head drum assembly including a head which rotates in contact with the tape from the tape cassette and records the signal on the tape or reproduces the recorded signal. In addition, the traveling system is provided with a voice reproducing head for reproducing a voice signal, and is provided with a capstan shaft which rotates by a capstan motor and runs a tape in cooperation with a pinch roller. A reel driving device is installed between the supply reel and the take-up reel to drive any one reel selected from the supply reel or the take-up reel by receiving power from the capstan motor. The head drum assembly is provided to have a predetermined angle of inclination with respect to the vertical line in order to helically scan the inclined track recorded on the magnetic tape.

Since the head drum assembly of the VR device is directly involved in the recording and reproducing of the signal, it must maintain a very high level of reliability and stability, and should generate little vibration or noise even when used repeatedly for a long time. In particular, vibration may cause cross talk, which may have a detrimental effect on image quality, and thus it is necessary to strictly manage it.

In view of this, a head drum assembly as illustrated in FIG. 1 has been developed and widely used in the related art. The head drum assembly includes a lower drum 10 fixed to a deck (not shown), a main shaft 12 assembled through the lower drum 10, and a main shaft fixed to an upper end of the main shaft 12. The upper drum 14 rotates with respect to the lower drum 10 together with the 12, and the electric motor 16 for causing the rotational movement to the main shaft 12 and the upper drum 14.

Then, for example, two head bases 18 are attached to the bottom of the upper drum 14 so that they are height-adjustable at intervals of 180 ° by a screw or the like, and each head base 18 is in the opposite direction thereof. The outer end is provided with a video head 19 for magnetically recording or reproducing a video signal. In addition, since the rotary transformer 20 is installed between the upper drum 14 and the lower drum 10 so as to transmit a signal in a contactless manner, an image signal supplied to or output from the video head is generated. You can give and receive without.

On the other hand, the electric motor 16 is composed of a stator 22 attached to the lower drum 10 and a rotor 24 fixed to the main shaft 12 to rotate relative to the stator 22, the rotor 24 Rotates at high speed with the main shaft 12 and the upper drum 14 as current is supplied to the stator 22, causing the video head 19 to scan the signal tracks of the tape in turn.

However, the head drum assembly having such a configuration mainly uses a die casting method in manufacturing the upper drum and the lower drum, thereby increasing the manufacturing cost and complicating the manufacturing process.

That is, since the conventional upper drum performs die casting, the surface of the die casted material in the form of the first upper drum, ie, the circumferential surface which comes into contact with the tape, is roughed first, and the head base fastening bolt 21 hole and the head height are adjusted. It is necessary to perform a drilling process to form a hole for the bolt 15, and then the surface is polished to a higher degree, and the lower drum is also subjected to a manufacturing process similar to the upper drum, which makes the process complicated. Of course, work efficiency is falling behind.

On the other hand, in the case of the pre-published Korean Patent Publication No. 88-5562, the outer diameter of the upper drum and the hard drum is formed of a metal round pipe, and the upper and lower drum outer diameters are manufactured by insert or outer mold molding of BMC or high dimensional stability material. .

However, the head drum of the structure described above does not use die casting, so the cost is reduced, but the cylindrical drum or hard drum does not perform the function of the head drum, but merely performs the function of the surface in contact with the tape. Therefore, a problem arises in that the processing or molding process of the body inserted into the upper drum and the hard drum becomes complicated. In addition, the head drum of such a structure has a structure that does not vary significantly compared to the conventional head drum described above, so that the weight of the head drum or the structure of the head drum cannot be simplified.

In addition, in the case of the pre-published Korean Utility Model Publication No. 89-11466 is manufactured to be installed on the inside of each brass ring formed with projections on the inside of the aluminum die cast rotating drum and fixed drum.

However, the head drum of the above-described structure is expensive because the die-casting rotary drum and the fixed drum is used, the high cost of the conventional problem described above, and the manufacturing process is very complicated.

Accordingly, the present invention has been made to solve the problems of the prior art as described above, the object is to provide a head drum of V-CAL and a method of manufacturing the same, which can reduce the manufacturing cost and facilitate the manufacturing.

The object of the present invention is a cutting process for cutting in a circular shape, a bending process for forming a drum portion by forming a boss portion and a receiving space in the cut iron plate, and filling the resin material having a shaft hole in the receiving space formed by the bending hole And the upper drum is manufactured; A drum portion whose outer surface is in contact with the tape is formed, and a resin material having an axial hole can be achieved by the manufacturing method of the head drum of V-C, which is made of a lower drum integrally molded inside.

In addition, an object of the present invention is the boss portion and the drum portion is formed, the upper drum is provided with a filler between the boss portion and the drum portion; A drum having a drum formed at an outer side thereof and having a resin molded therein; It can be achieved by the head drum of V-C is composed of a spacer interposed between the upper drum and the lower drum.

Hereinafter, the configuration of a preferred embodiment of the present invention in more detail based on the accompanying drawings as follows.

2 is a longitudinal sectional view showing the configuration of the head drum according to the present invention, according to the lower drum 140 is fixed to the deck, and the main shaft 120 is assembled through the lower drum 140 And, the upper drum 100 is fixed to the upper end of the main shaft 120 and rotates about the lower drum 140 with the main shaft 120, and the rotary motion to the main shaft 120 and the upper drum 100 An electric motor 160 for inducing is provided. In addition, a head base 180 is attached to the bottom of the upper drum 100 so that height adjustment is possible at intervals of 180 ° by a screw or the like, and each head base 180 provides an image signal at its radially outer end. A video head 190 is provided for recording or playing magnetically.

In addition, since the rotary transformer 200 is installed between the upper drum 100 and the lower drum 140 so as to transmit a signal in a non-contact manner, the image signal supplied to or output from the video head is converted into noise. You can send and receive without occurrence. On the other hand, the electric motor 160 is composed of a stator 220 attached to the lower drum 140 and a rotor 240 fixed to the main shaft 120 to rotate the stator 220, the rotor 240 ) Rotates at high speed with the main shaft 120 and the upper drum 100 as the current is supplied to the stator 220, causing the video head 19 to sequentially scan the signal tracks of the tape.

According to the present invention, as shown in FIG. 3, the upper drum 100 has a boss portion 102 having a shaft hole 102a that is bent at a central portion of a circular iron plate, and is formed on the shaft hole 102a. The main shaft 120 is inserted into. In addition, the outer side of the upper drum 100 is bent in the same direction as the boss portion 102 of the circular iron plate circumference is formed a drum 104, the outer surface in contact with the tape.

Meanwhile, in the present invention, an accommodation space 106 formed between the boss portion 102 and the drum portion 104 is formed, and the boss portion 102 and the drum portion 104 are deformed on the accommodation space 106. Fill 108 to suppress the filling. The filler 108 is inserted into a molten state and solidified with time, and is preferably composed of a material having good heat resistance.

In addition, according to the present invention, the lower drum 140 has a hole formed in the center portion, and a drum portion 142 having an outer surface in contact with the tape is formed by forming a circular iron plate circumferentially bent at one side. The resin material 144 having a shaft hole 144a rotatably coupled to the main shaft 120 is integrally molded on the hole. A spacer 150 is inserted between the resin material 144 and the upper drum 100 to maintain a gap between the two members.

The present invention having such a configuration includes a cutting step of cutting the iron plate 101 having a predetermined thickness into a circular shape having a predetermined thickness as shown in FIG. 3 (a), and as shown in FIG. A bending step of bending the drum portion 104 in which the boss portion is bent on the inside of the cut steel plate, the receiving space 106 is formed between the boss portion 102 and the outer surface is in contact with the tape; As shown in (c), the filling process of filling the resin material into the receiving space 106 of the bent material is sequentially performed to manufacture an upper drum, and a hole is formed in the center of the round iron plate. By forming a circular iron plate circumferentially bent at one side to form a drum 142, the outer surface is in contact with the tape to manufacture the lower drum, it is possible to manufacture the upper, lower drum by the pressing and injection process.

Therefore, the present invention can be configured lightly of the weight of the upper drum, as well as the manufacturing process can be easily progressed to increase the productivity. That is, since the injection molding of the relatively light weight of the filling compared to the forging is to be reduced, as well as to reduce the manufacturing process.

As described in detail above, according to the head drum of the present invention and the manufacturing method thereof, the upper and lower drums are produced by pressing the iron plate and adding resin, while reducing the weight as well as the manufacturing cost. The effect which can improve productivity is acquired.

Claims (2)

A lower drum maintained in a fixed state, a main shaft assembled through the lower drum and driven by a motor, and fixed to an upper end of the main shaft and rotating along with the main shaft, for recording and reproducing a video signal. In the head drum assembly of V-AL consisting of an upper drum having the upper drum, the upper drum 100 is a cutting process for cutting the iron plate having a predetermined thickness into a circular shape of the required size, and the boss portion inside the cut iron plate The bending process in which the 102 is bent and the receiving portion 106 is formed on the outside with the boss portion 102 and the drum 104 in contact with the tape is formed on the outer surface, and the accommodating space of the finished material is bent. Manufactured by a filling step of filling a resin in 106; The lower drum 140 has a hole formed in the center portion, and forms a drum portion 142 in which the outer surface is in contact with the tape by forming a circular iron plate circumferentially bent at one side, and rotating on the hole with the main shaft 120. Resin 144 having a shaft hole (144a) that is possibly coupled is integrally molded and manufactured, characterized in that the manufacturing method of BC head drum. According to claim 1, wherein the upper drum 100 has a boss portion 102 having a shaft hole (102a) in the center of the circular iron plate is bent, the same as the boss portion 102 at the periphery of the circular iron plate The drum portion 104 is bent in the direction and the outer surface is in contact with the tape is formed, and the boss portion 102 and the drum portion 104 is filled in the receiving space 106 between the boss portion 102 and the drum portion 104. A filler 108 is provided to suppress the deformation of c); The lower drum 140 has a drum portion 142 having an outer surface in contact with a tape by bending at a right angle to a circular iron plate circumference formed with a hole in a central portion thereof, and rotatable with the main shaft 120 on the hole. Resin material 144 having shaft holes 144a coupled to each other is integrally molded; V-head head drum, characterized in that the spacer 150 for defining the relative position between the upper drum 100 and the lower drum 140.