KR970008602B1 - Drum apparatus of tape recorder - Google Patents

Abstract

A drum apparatus used for video tape recorder is provided to prevent a vibration of drum and improve an workability. The drum apparatus comprises: a bridging jaw(6a,6b) formed on upper part of a lower drum(2) and lower part of a upper drum(1); a plate connector(9) of touch-type for connecting signals between a head(7) protruded from the outer surface of the upper and lower drums(1,2) and a rotary trans(8); a tension member(13) formed on a back york(12) formed at both sides of bush(11); a fixed groove(18) formed at end of the bush(11); a via hole(19) formed in a drum base and a main deck(17); and a torsion spring(20) located between the fixed groove(18) and the via hole(19). Thereby, it is possible to improve workability.

Description

Drum unit of tape recorder

1 is a cross-sectional structural view of a conventional drum.

2 is a cross-sectional structural view of the drum according to the present invention.

* Explanation of symbols for main parts of the drawings

1,1a: Upper drum 2,2a: Lower drum

3,3a: Drum motor 4,4a: Bearing

5,5a: shaft 6,6a: locking jaw

7,7a: head 8,8a: rotary transformer

9: plate connector 10, 10a: stator transformer

11 bush 11a fastening member

12: back yoke 13: elastic member

14, 14b: Stator 14a: Fastening member

15,15a: rotor 16: drum bass

17: main deck 17a, 17b: fastening member

18: fixing groove 19: through hole

20: torsion spring 21: boss

The present invention relates to a drum device of a tape recorder, and more particularly, to reduce the height of a drum used for a camcorder, a video tape recorder, and the like, and to reduce the weight and thickness of the drum.

The conventional drum has a structure in which the upper, lower drums 1a, 2a and the drum motor 3a are installed on the shaft 5a, as shown in FIG. 1, and the upper drum 1a is fixed by the fastening member. As the boss 21 is fixed to the shaft (5a), the head (7a) is attached to the bottom of the upper drum (1a), the rotary transformer (8a) is installed on the bottom of the boss 21, the upper drum ( 1a) It is supported by the shaft (5a) and the bearing (4a) in the lower portion, the stator transformer (10a) corresponding to the rotary transformer (8a) is installed in the upper portion, the stator is fixed to the shaft (5a) in the lower portion A drum motor 3a consisting of a 14b and a rotor 15a was provided.

However, in the conventional drum apparatus as described above, the drum motor could not effectively prevent vibrations other than the original inherent functions or effectively prevent balance maintenance and external leakage of the magnetic field generated in the drum.

In addition, drums used in general camcorders, video tape recorders, and the like are affected by high-speed rotation, air flow and friction, and have a great effect on image quality when recording or playing back images of the tape. Due to the gap between the lower drums 1a and 2a, the tape was sucked between the gaps of the head 7a to shorten the service life of the tape and drum.

In addition, in order to draw out the internal static electricity generated in the drum, a drum fixed as the shaft 5a is formed on the drum base 13a, and one side of the head brush (not shown) is disposed on one side of the drum base 13a. By fixing as a fastening member, the end of the shaft and the end of the head brush is installed so that the internal static electricity generated in the drum is drawn out through the head brush.

However, the apparatus for drawing out the internal static electricity generated in the drum in such a configuration is exposed to the outside of the drum by fixing the head brush on the drum base, thereby increasing the size of the drum.

In addition, in order to transmit signals between the head of the drum and the rotary transformer, as shown in FIG. 1, when the signal is transmitted between the head 7a and the rotary transformer 8a, the performance decreases due to the mixing of noise. Due to the bending of the screen may occur, the pressure applied to the bearing (4a) for supporting the upper, lower drum (1a), (2a) is changed according to the temperature change not only deteriorate the performance but also the head (7a) By increasing the number of parts according to the structure between the rotary transformer and the rotary transformer 8a, assembly time is increased, productivity is lowered and costs are increased, performance due to cumulative tolerance is degraded, and the height of the drum is increased due to the increase in weight and weight of the device. There was a problem in miniaturization of the product according to.

The present invention has been proposed to solve the above problems, and an object of the present invention is to maintain the gap between the upper and lower drums used in a camcorder or a video tape recorder to minimize the inflow of air during high speed rotation. It can prevent the tape from being sucked between the gaps by blocking it, and it can improve the work efficiency and lower the height of the drum by touching the signal transmission system between the drum head and the rotary transformer. The drum device of the tape recorder which can draw out the main motor efficiently from the rotor of the drum motor through the torsion spring, maintains and balances the vibration, and prevents the external leakage of the magnetic field generated inside the drum. In providing.

A feature of this invention for achieving the above object is, in the drum device of the tape recorder mounted on the rotating drum, the engaging jaw formed so that the lower surface of the upper drum and the upper surface of the lower drum are mutually coupled, the upper and lower As a fastening member on the outer periphery of the shaft end, the touch type plate connector which connects signals between the head and the rotary transformer which protrudes finely from the outer circumferential surface of the drum and the drum motor of the upper, lower drum and lower part are supported by bearings. A fixed bush, an elastic member formed between the upper end of one axis of the back yoke formed on both sides of the bush and the bush, a stator fixed to the upper part of the back yoke as a fastening member and disposed in parallel, a rotor of the upper bush, The fixing groove is formed at one side of the drum base and the main cover, and the through hole is formed at the torsion spring. In the ID unit of the tape recorder is configured to install.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

2 is a cross-sectional view of the drum according to the present invention, in which upper, lower drums 1 and 2 and lower drum motors 3 are supported by bearings 4 and are fixed to shafts 5 and installed. At the lower end of the upper drum 1 and the upper end of the lower drum 2, engaging jaws 6a and 6b are formed to be alternately coupled to each other, and outer peripheral surfaces of the upper drum 1 and the lower drum 2 are formed. The head 7 is installed in a state of minutely protruding from the plate, and a plate connector 9 for transmitting a signal between the head 7 and the rotary transformer 8 is provided between the head 7 and the rotary transformer 8. It is installed in a touch type, the stator transformer 10 is formed at the lower portion of the rotary transformer 8, the bush 11 is fastened to the outer periphery of the end of the shaft (5) of the drum motor (3) fastening member (11a) It is fixed and installed as, the balance of both sides of the bush 11 and the external leakage of the magnetic field generated in the drum A back yoke 12 is installed to prevent the back yoke 12, and an elastic member 13 is provided between the upper side of the back yoke 12 and the bush 11 to provide a shock absorbing effect due to rotation. The back yoke 12 The stator 14 is fixed to the upper part of the) as a fastening member 14a, and a rotor 15 is formed on the upper part of the stator 14, and the upper and lower drums 1, 2 and the lower part thereof. One side bottom of the connected drum motor 3 and the drum base 16 and the main deck 17 are fixed as the fastening member 17a, and the drum base 16 and the main deck 17 as the fastening member 17b. And a fixing groove 18 is formed at one end of the bush 11 formed at the outer periphery of the shaft 5 end, and a through hole 19 is formed in the drum base 16 and the maintec 17. A row formed on the stator 14 by fixing one side of the torsion spring 20 to the fixing groove 18 and inserting the other side into the through hole 19. An internal static (15) is configured to be drawn out to the main tekkeu 17 via the torsion coil spring 20.

In this configuration, as shown in FIG. 2, the engaging jaws 6a and 6b are respectively disposed on the lower end of the upper drum 1 and the lower drum 2 of the drum used in a camcorder or a video tape recorder. Forming and staggered to each other, by blocking the inflow of air into the gap between the upper drum (1) and the lower drum (2) when the tape rotates at high speed, thereby preventing the tape from being sucked between the gap, The gap between the upper drum 1 and the lower drum 2, that is, the sliding resistance at the edge portion is also actively prevented, so that the gap between the upper and lower drums 1a and 2a when the conventional drum shape is used. It will not be sucked into the gap.

In addition, when a current is applied to the stator 14 fixed as the fastening member 14a of the drum motor 3, a magnetic field is generated, and the upper drum 1 is supported by the bearing 4 as the rotor 15 rotates. When rotating about the axis 15, the head (7) installed on the bottom of the upper drum (1) reads the signal of the tape to the rotary transformer (8) on the lower drum (2) and the rotary transformer (8) The signal is transmitted to the stator transformer 15 fixed to the lower part and not rotating.

On the other hand, the rotary transformer (8) and the stator transformer (15) should be installed so as to maintain a proper clearance, and at this time, when the transmission output value of the rotary transformer (8) and the stator transformer (15) becomes optimal, the rotary transformer ( 8) and the stator transformer (15) are installed.

In addition, by installing the stator 14 and the rotor 15 in the longitudinal direction unlike the first conventional method, by greatly reducing the thickness of the stator 14, the size of the drum motor 3 is greatly reduced, the back yoke By installing the elastic member 13 between one side upper portion and the bush 11 of the (12), it is possible to perform a buffering action according to the rotation, by installing the back yoke 12 on both sides of the bush (11) The balance can be maintained, and the external leakage of the magnetic field generated inside the drum can be prevented.

In addition, a through hole 19 is formed in the fixing groove 18, the drum base 16, and the main deck 17 at one side of the bush 11 formed at the outer circumference of the end of the shaft 5 to form the torsion spring 20. Since one side is fixed to the fixing groove 18, the other side is inserted into the through hole 19 so that the internal static electricity from the rotor 15 is drawn out to the main deck 17 through the torsion spring 20. The conventional problems, such as the head brush is exposed to the outside of the conventional drum to increase the size of the drum is solved.

As described above, by using the drum apparatus of the tape recorder according to the present invention, it is possible not only to reduce the height of the drum used in a camcorder or video tape recorder, which requires a compact and thin film, but also to increase the efficiency and service life of the drum, It is a very useful invention with many advantages, such as being able to light and shorten the size.

Claims (1)

A drum apparatus of a tape recorder mounted with a rotating head drum, comprising: a locking jaw formed so that the bottom surface of the upper drum and the upper surface of the lower drum are alternately coupled to each other, and between the head and the rotary transformer slightly protruding from the outer circumferential surfaces of the upper and lower drums. Touch type plate connector for interconnecting signals to the bush, bushes fixed as fastening members on the outer periphery of the shaft end where the upper, lower drum and lower drum motors are supported by bearings, and one side of the back yokes formed on both sides of the bush An elastic member formed between the bushes on the upper side, the stator and the upper rotor fixed in parallel as the fastening member on the back yoke, the fixing groove on one side of the bush, and a through hole on the drum base and the main deck. Tape recorder, characterized in that configured by installing a torsion spring between the fixing groove and the through hole Drum device.