KR200255056Y1 - Head drum assembly of video cassette recorder - Google Patents

Abstract

The present invention relates to a head drum assembly of the VCR, the lower drum 100 is the drum shaft 200 is press-fitted so that the drum motor 400 is deeply coupled to the upper drum 300 in order to reduce the overall thickness of the head drum assembly The boss part 110 fixedly installed extends upward, and the upper drum 300 is press-fitted into the drum shaft 200 and its inner ring 311 is positioned between the boss part 110 and the preload boss 500. As the upper drum is rotated and supported by the single bearing 310, the drum is rotated by the single bearing to reduce the production cost by reducing the use of expensive bearings, and the drum motor is the upper drum. Deep coupling to the drum reduces the length of the drum shaft and at the same time reduces the overall thickness of the head drum assembly, making it easier to miniaturize the VCR. The drum shaft is pressed into the boss of the lower drum. Increasing the indentation length of the drum shaft has an effect of improving the image quality by improving the squareness of the drum shaft.

Description

HERC DRUM ASSEMBLY OF VIDEO CASSETTE RECORDER

The present invention relates to a head drum assembly of a video cassette recorder (hereinafter, referred to as 'VCR'), and more specifically, an upper drum is rotated and supported on a drum shaft by a single bearing. It is directed to a head drum assembly of a VCR that reduces the use of bearings and allows the drum motor to be deeply coupled to the upper drum to reduce the overall thickness of the head drum assembly.

In general, a VCR is a device that plays back contents recorded on a cassette tape or converts an image signal from an external device into a magnetic signal through a head and records the cassette on a cassette tape. .

The main driving mechanism of the VCR that performs these functions is the front loading assembly, which is the seating device of the cassette tape, and the head drum assembly, which is a part that plays back or records the signal in direct contact with the cassette tape. It is composed of 'y', etc., and such a part is a deck mechanism.

Referring to the head drum assembly in the deck mechanism with reference to the accompanying drawings as follows.

1 is a partial cross-sectional view showing a head drum assembly of a conventional VCR. As shown in the figure, a cylindrical lower drum 10 fixed at the same slope on the top of the drum base (not shown) fixedly installed at an inclined angle on a main chassis (not shown) provided with a deck mechanism, and a lower portion The drum shaft 20 has a lower end fixed to the drum 10, and the upper and lower bearings 31 and 32 are positioned vertically above the lower drum 10 and installed up and down on the drum shaft 20. An upper drum 30 rotatably supported by the shaft 20 and a drum motor 40 installed on the upper drum 30 and fixed to the upper end of the drum shaft 20 are included.

The lower drum 10 has a boss portion 11 formed at the center thereof, and the drum shaft 20 is press-fitted to the boss portion 11 and fixed thereto. In addition, a lower rotary trans (Rotary Trans) 12 is installed on the inner upper portion of the lower drum 10.

The bearings 31 and 32 are press-fitted and fixed to the drum shaft 20 up and down, and the inner surface of the upper drum 30 is press-fitted to the outer ring of each of the bearings 31 and 32 to be press-fitted.

The upper drum 30 is provided with a plurality of heads 33 at predetermined intervals at the lower end thereof, and is rotated while being electrically connected to the lower rotary transformer 12 of the lower drum 10 at the lower end thereof. An upper rotary transformer 34 for applying the video signal applied from 33 to the lower rotary transformer 12 is provided.

Drum motor 40 is installed on the upper drum 30, the upper portion of the upper drum 30, the rotor 41 to which the ring-shaped magnet 41a is attached to the inner peripheral surface through the fixing screw (S) It is fixedly installed, the stator 42 which is converted into an electromagnet when the current is applied to the center of the rotor 41 is fixed to the drum shaft 20 by the preload boss 50.

The conventional drum assembly having such a configuration is fixed to the rotor 41 by rotating the rotor 41 in a predetermined direction by an electromagnetic force generated between the rotor 41 and the stator 42 of the drum motor 40. The upper drum 30 is also rotated by the upper and lower bearings 31 and 32 fixedly installed on the upper and lower sides of the drum shaft 20, and receives an image signal from the cassette tape through the head 33 of the upper drum 30. Play or record.

The head drum assembly of the conventional VCR has a problem in that the upper drum is provided with upper and lower bearings up and down on the drum shaft so that the upper drum rotates from the drum shaft, thereby providing a plurality of expensive bearings to increase the production cost. there was.

In addition, since the upper and lower bearings are respectively provided on the drum shaft, most of the drum motors protrude from the upper side of the upper drum, thereby increasing the size of the head drum assembly, which has a problem in that the trend of miniaturization of the VCR is an obstacle.

The present invention is to solve the above-mentioned conventional problems, the object of the present invention is to reduce the production cost by reducing the use of the bearing, which is an expensive part, because the upper drum is rotatably supported on the drum shaft by a single bearing, The deep coupling of the drum motor to the upper drum reduces the length of the drum shaft and at the same time reduces the overall thickness of the head drum assembly, making it easier to miniaturize the VCR and increasing the press-in length of the drum shaft being pressed into the boss of the lower drum. An object of the present invention is to provide a head drum assembly of a VCR that improves the image quality by improving the squareness of the drum shaft.

The present invention for realizing the above object, the lower drum extends upwardly to form a boss portion in which the drum shaft is pressed and fixed so that the drum motor is deeply coupled to the upper drum in order to reduce the overall thickness of the head drum assembly, the upper drum Is pressed into the drum shaft and its inner ring is rotatably supported by a single bearing positioned between the boss and the preload boss.

1 is a partial cross-sectional view showing a head drum assembly of a conventional VCR,

2 is a partial cross-sectional view showing a head drum assembly of the VCR according to the present invention.

<Description of Symbols for Main Parts of Drawings>

100; Lower drum 110; Boss

120; Lower rotary transformer 200; Drum shaft

300; Upper drum 310; bearing

320; Head 330; Top rotary transformer

400; Drum motor 410; Rotor

411; Magnet 420; Stator

500; Preload Boss

Hereinafter, with reference to the accompanying drawings, the most preferred embodiment of the present invention will be described in more detail to be easily carried out by those of ordinary skill in the art.

2 is a partial cross-sectional view showing a head drum assembly of the VCR according to the present invention. As shown, the head drum assembly of the VCR according to the present invention is a drum that is press-fitted into the lower drum 100 and the boss portion 110 of the lower drum 100 to form a boss portion 110 upwardly The bearing 200 is pressed by the shaft 200, the drum shaft 200, and the inner ring 311 is positioned at the upper end of the boss part 110 of the lower drum 100, and is rotated by the bearing 310. The upper drum 300 to be supported and the rotor 410 are fixed to the upper end of the upper drum 300, and the stator 420 positioned at the center of the rotor 410 includes the inner ring 311 of the bearing 310. It includes a drum motor 400 fixed to the drum shaft 200 by a preload boss 500 located at the top.

The lower drum 100 is formed in a cylindrical shape and is fixedly installed at the same inclination on the top of the drum base (not shown) which is installed to be fixed inclined at a predetermined inclination on the main chassis (not shown) provided with the deck mechanism. Lower Rotary Trans 120 is installed.

In addition, the lower drum 100 is formed by extending the boss portion 110 to which the drum shaft 200 is press-fitted in the center thereof. That is, since only a single bearing 310 is press-fitted to the drum shaft 200, the press-in length of the drum shaft 200 press-fitted to the boss 110 may be increased, so the lower drum 100 may have a boss 110. ) Can be extended upward. Therefore, the press-in length of the drum shaft 200 press-fitted into the boss portion 110 of the lower drum 100 is increased to improve the squareness of the drum shaft 200, thereby improving image quality.

Since the single bearing 310 is press-fitted and fixedly installed on the drum shaft 200, its length is reduced compared to the conventional case in which a plurality of bearings are installed on the drum shaft 200.

The bearing 310 is pressed into the drum shaft 200 so that the inner ring 311 is located at the upper end of the boss portion 110 of the lower drum 100, and the outer ring 312 is an inner surface of the upper drum 300. It is pressed in and fixed to

The upper drum 300 is rotatably supported from the drum shaft 200 by a bearing 310. In addition, the upper drum 300 is provided with a plurality of heads 320 at predetermined intervals on the bottom surface, the head (rotated in the state connected electrically to the lower rotary transformer 120 of the lower drum 100 at the lower end ( The upper rotary transformer 330 for applying the image signal applied from the 320 to the lower rotary transformer 120 is installed, the drum motor 400 is installed on the upper side.

The drum motor 400 has a rotor 410 fixedly installed on the upper drum 300 through a fixing screw S, and a ring-shaped magnet 411 is attached to an inner circumferential surface of the rotor 410. In addition, a stator 420 that is converted into an electromagnet when a current is applied to the center of the rotor 410 is fixed to the drum shaft 200 by the preload boss 500.

The preload boss 500 is located at the upper end of the inner ring 310 of the bearing 310. Therefore, since only a single bearing 310 is fixed to the drum shaft 200, the preload boss 500 is deeply coupled to the upper drum 300. Therefore, the preload boss 500 fixedly installing the stator 420 on the drum shaft 200 is deeply coupled to the upper drum 300 such that the drum motor 400 is also deeply positioned on the upper drum 300. The overall thickness of the assembly of the head drum is reduced.

As described above, according to a preferred embodiment of the present invention, the upper drum is rotatably supported on the drum shaft by a single bearing, thereby reducing the use of an expensive component bearing, and the drum motor is deeply coupled to the upper drum, The overall thickness is reduced, and the press-in length of the drum shaft pressed into the boss of the lower drum is increased, thereby improving the squareness of the drum shaft, thereby improving image quality.

As described above, the head drum assembly of the VCR according to the present invention reduces production costs by reducing the use of bearings, which are expensive components, because the upper drum is rotatably supported on the drum shaft by a single bearing, and the drum motor is Deep coupling to the drum reduces the length of the drum shaft and at the same time reduces the overall thickness of the head drum assembly, making it easier to miniaturize the VCR, and increasing the press-in length of the drum shaft that is press-fitted to the boss of the lower drum. It has the effect of improving the picture quality by improving the degree.

What has been described above is only one embodiment for implementing the head drum assembly of the VCR according to the present invention, the present invention is not limited to the above embodiment, as claimed in the utility model registration claims below Without departing from the gist of the invention, anyone with ordinary knowledge in the field to which the invention belongs will have a technical spirit of the present invention to the extent that various modifications can be made.

Claims (1)

A cylindrical lower drum, a drum shaft having a lower end fixed to the lower drum, an upper drum positioned vertically above the lower drum and rotatably mounted to the drum shaft, and a rotor fixed to an upper portion of the upper drum. In the head drum assembly comprising a drum motor, the stator located at the center of the rotor is fixed to the drum shaft by a preload boss, In order to reduce the overall thickness of the head drum assembly, the lower drum extends upwardly to a boss portion in which the drum shaft is press-fitted and fixed so that the drum motor is deeply coupled to the upper drum, and the upper drum is connected to the drum shaft. And the inner ring of the VCR is rotatably supported by a single bearing positioned between the boss and the preload boss.