KR19980058999A - Tape unwinding device of tape recorder - Google Patents

Abstract

The present invention relates to a tape release prevention device of a tape recorder, and more particularly, to a tape release prevention device of a tape recorder in which a tape of a cassette is normally driven. A first optical sensor is mounted to detect the loose state of the tape, and comprises a light emitting unit for emitting an optical signal to the tape and a light receiving unit for detecting the optical signal reflected from the tape, and an audio / control head assembly and a pinch when the tape is driven backward. A second optical sensor is mounted between the rollers so as to detect a loose state of the tape, and includes a light emitting unit for emitting an optical signal on the tape, and a light receiving unit for detecting an optical signal reflected from the tape. Control to determine the tape unwinding state by detecting the In addition, since the unwinding state of the tape is detected by the first and second optical sensors and then controlled by the control unit in a normal running state, damage to the mechanism of the traveling system or the tape is effectively prevented, and the running characteristic of the tape is improved. The reliability of the product is remarkably improved.

Description

Tape unwinding device of tape recorder

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape recorder, and more particularly, to an apparatus for preventing tape loosening of a tape recorder in which a tape of a cassette is normally driven.

Generally, a tape recorder such as a video cassette recorder or a camcorder (recorder) records or reproduces video and audio signals on a tape traveling along a certain driving path of a traveling system.

The traveling system of such a tape recorder, as shown in Fig. 1, is provided with a head drum 11 on the upper surface of the deck 10, and along the loading holes (not shown) of the deck 10 on both sides of the head drum 11; Each pole base assembly 12 for loading / unloading the tape T of the cassette C is located.

In addition, a full width erasing head 13 and an audio / control head assembly 14 are mounted on both sides of the head drum 11 so as to be adjacent to the pole base assembly 12, and adjacent to the audio / control head assembly 14. In the position a pinch roller 15 is mounted.

On the other hand, the pinch roller 15 is brought into close contact with the shaft 17 of the capstan motor 16 to drive the tape T of the cassette C by pressing. The cassette C is seated on the supply and take-up rail tables 20 and 21 of the deck 10, and the tape T is selectively wound in accordance with the conversion state of each mode. Then, the driving force of the capstan motor 16 is transmitted to the idler assembly 23 by the real clutch assembly 22, and the supply and take-up rail table 20 and 21 are selectively selected by the action of the idler assembly 23. Is rotated. However, the traveling system of the tape recorder as described above, the idler assembly 23 is not accurately engaged with the supply and take-up rail table 20, 21, or due to mechanical malfunction and interference, etc. There was a problem that the tape T could not be wound around the supply and take-up rail tables 20 and 21 and loosened.

In this way, when the tape T of the cassette C is not wound tightly on the supply and take-up rail tables 20 and 21 but is loosely unwound, the mechanism or the tape T of the traveling system. In addition to the fatal damage to the product, the reliability of the product is not only degraded, but the tape (T) does not maintain a normal running path, so the running characteristics of the tape (T) is deteriorated, there is a problem that the image quality is poor.

In order to solve this problem, the running state of the tape T is controlled by a real sensor (not shown) which senses the rotational speed of the supply and take-up rail tables 20 and 21.

However, since the time required for detecting the rotation state of the supply and take-up rail tables 20 and 21 should be based on 1/3 times the speed (E / P mode), the width of the time is relatively wide. When the rail sensor detects that the supply and take-up rail tables 20 and 21 are not rotated, a considerable amount of the tape T is already taken out. For this reason, the effect of preventing the damage of the tape (T) had a problem difficult to expect.

Accordingly, the present invention has been made to solve the above problems, an object of the present invention is to provide a tape recorder preventing device of the tape recorder to improve the reliability of the product is maintained by running the tape normally.

1 is a plan view schematically showing a traveling system of a typical tape recorder

Figure 2 is a plan view showing a tape release prevention device of the tape recorder according to the present invention

3A and 3B are plan views showing a sensing state of the tape unwinding device according to the present invention.

Figure 4 is a flow chart for explaining the operating state of the tape loosening prevention apparatus according to the present invention

* Explanation of symbols for main parts of the drawings

10 deck 11: head drum

14 Audio / Control Head Assembly 15 Pinch Roller

16 capstan motor 20, 40 first and second optical sensor

31, 41: light emitting part 32, 42: light receiving part

C: Cassette T: Tape

An object of the present invention is to provide a tape recorder for recording or reproducing video and audio signals on a tape traveling along a certain driving path of a traveling system, such that the tape is unwound on one side of the pinch roller when the tape is driven forward. A first optical sensor which is mounted and comprises a light emitting portion for emitting an optical signal on the tape and a light receiving portion for detecting the optical signal reflected from the tape, and the tape unwinding between the audio / control head assembly and the pinch roller during the reverse driving of the tape. A second optical sensor comprising a light emitting unit for emitting an optical signal on the tape and a light receiving unit detecting an optical signal reflected from the tape, and unwinding of the tape by sensing of the first and second optical sensors A tape pool of a tape recorder including a control unit for determining a state and controlling a running state of the tape It can be achieved by the protection device.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the tape release prevention device of the tape recorder according to the present invention will be described in detail as follows.

2 to 4 are diagrams for explaining the tape loosening prevention device of the tape recorder according to the present invention, and the basic configuration of the traveling system of the tape recorder described in FIG. 1 will be described with the same reference numerals.

First, referring to FIG. 1, the head drum 11 is installed on the upper surface of the deck 10, and the tape T of the cassette C of the deck 10 is loaded on both sides of the head drum 11. Each pole base assembly 12 for / unloading is located.

In addition, a full width erasing head 13 and an audio / control head assembly 14 are mounted on both sides of the head drum 11 so as to be adjacent to the pole base assembly 12, and adjacent to the audio / control head assembly 14. The pinch roller 15 is mounted in the position.

On the other hand, while the pinch roller 15 is in close contact with the shaft 17 of the capstan motor 16, the tape T of the cassette C is driven by pressing, and the supply and take-up rail table 20 of the deck 10 is pressed. The cassette C is seated in the plenum 21 to selectively wind the tape T in accordance with the conversion state of each mode.

Then, the driving force of the capstan motor 16 is transmitted to the idler assembly 23 by the real clutch assembly 22, and the supply and take-up rail table 20 and 21 are engaged by the idler assembly 23. It is selectively rotated to wind the tape (T).

As shown in FIG. 3, the first optical sensor 30 is mounted on one side of the pinch roller 15 to sense the unwinding of the tape T in the regular running direction of the tape T. As shown in FIG. That is, the first optical sensor 30 is mounted on the exit side of the pinch roller 15.

In addition, a second optical sensor 40 is mounted between the audio / control head assembly 14 and the pinch roller 15 to detect the loosening of the tape T in the reverse travel direction of the tape T. That is, the second optical sensor 40 is mounted at the inlet side of the pinch roller 15.

The first and second optical sensors 30 and 40 may include light emitting parts 31 and 41 for emitting an optical signal and scanning the tape T, and a light receiving part for detecting the optical signal reflected from the tape T ( 32) (42).

At this time, the first and second light sensors 30 and 40 are in the normal running state of the tape (T) is reflected by the optical signal of the light emitting unit 31, 41 is reflected by the tape (T) light receiving unit 32, 42 Is installed so as to face the recording surface of the tape T so as to be accurately detected.

Then, when the first and second optical sensors 30 and 40 are installed to face the recording surface of the tape T, the light signals of the light emitting units 31 and 41 are released from the tape T in the tape T unwinded state. Is diffusely reflected by the light absorber 32 and is not detected by the light receiving units 32 and 42.

Here, the first and second optical sensors 30 and 40 may be configured by a general photo coupler using a light emitting diode and a light receiving diode.

Meanwhile, the optical signals detected by the light receiving units 32 and 42 of the first and second optical sensors 30 and 40 are transmitted to the controller 50, and the controller 50 is in a loose state of the tape T. The driving state is controlled according to the unwinding state of the tape T. Here, the controller 50 can be configured by a general microcomputer.

Referring to the operation of the tape release prevention device of the tape recorder according to the present invention as described above are as follows.

As shown in FIG. 3A, the pinch roller 15 is in close contact with the shaft 17 of the capstan motor 16 when the tape T, such as play or fast forward FF, is driven forward. When traveling in the forward direction by compression, if the tape T is normally driven without loosening, the optical signal emitted from the light emitting portion 31 of the first optical sensor 30 is reflected by the tape T. .

As shown in FIG. 4, when the optical signal of the light emitting unit 31 is reflected by the tape T and detected by the light receiving unit 32, the optical signal detected by the light receiving unit 32 is input to the control unit 50 and the tape T Is judged to be in a normal state, and thus the playback or recording function of the tape T is normally performed.

On the other hand, as shown in FIG. 3B, when the tape T is loosely driven and traveled, the optical signal emitted from the light emitting portion 31 of the first optical sensor 30 is diffusely reflected by the tape T to receive the light receiving portion ( 32, the optical signal is not detected.

When the optical signal is not detected by the light receiving unit 32 of the first optical sensor 30 as described above, the controller 50 determines the unwinding state of the tape T.

As shown in FIG. 4, when the released state of the tape T is determined by the operation of the control unit 50, the driving of the capstan motor 16 is stopped by the operation of the control unit 50, and the capstan motor 16 is stopped. The pinch roller 15 is spaced apart from the shaft 17 of, i.e., the adhesion state is dropped.

Then, the control unit 50 performs the driving of the capstan motor 16 in the reverse direction, and then releases the tape T by the light emitting unit 31 and the light receiving unit 32 of the first optical sensor 30. Detect.

At this time, when the capstan motor 16 is driven in the reverse direction and the loose state of the tape T is in a normal driving state, an optical signal is detected by the light receiving unit 32, thereby driving the capstan motor 16 in the forward direction. Then eject the cassette (C).

Subsequently, when the ejection of the cassette C is completed, the controller 50 causes the user to recognize the abnormal state by the operation of a general display device (not shown).

Referring back to FIG. 3B, the pinch roller 15 is in close contact with the shaft 17 of the capstan motor 16 when the tape T is driven in the reverse direction such as reverse play or rewind, and the tape T is reversed by pressing. When the tape T is loosened and traveled in the case of traveling in the direction of light, the optical signal emitted from the light emitting portion 41 of the second optical sensor 40 is diffusely reflected by the tape T to the light receiving portion 42. The optical signal is not detected.

When the optical signal is not detected at the light receiving unit 22 of the second optical sensor 40 as described above, the controller 50 determines the unwinding state of the tape T.

And as shown in FIG. 4, when the loosening state of the tape T is determined by operation of the control part 50, the drive of the capstan motor 16 is stopped by operation of the control part 50, and a capstan motor The pinch roller 15 is separated from the shaft 17 of 16.

At this time, the controller 50 performs the driving of the capstan motor 16 in the forward direction, and the tape T is normally driven by the light emitting part 41 and the light receiving part 42 of the second light sensor 40. Determine if the state is made.

In addition, the controller 50 performs the driving of the capstan motor 16 in the reverse direction, and then ejects the cassette C to recognize the abnormal state by the operation of the display device.

Accordingly, in the present invention, the unwinding state of the tape T is detected by the first and second optical sensors 30 and 40, and the unwinding state of the tape T is controlled by the controller 50 in a normal running state. By controlling, the damage of the system and the tape T of the traveling system, such as the all-amplification head 13 and the audio / control head assembly 14, is prevented, and as a result, the reliability of a product is improved significantly.

In addition, since the running state of the tape T is naturally and smoothly maintained, the running characteristic of the tape T is improved and the image quality is clearly improved.

As described above, according to the tape release prevention device of the tape recorder according to the present invention, after the tape release state is detected by the first and second optical sensors, it is controlled by the control unit in a normal driving state, thereby preventing the mechanism of the traveling system. Not only the tape damage is effectively prevented, but also the running characteristics of the tape are improved, which significantly improves the reliability of the product.

Claims (2)

A tape recorder for recording or reproducing video and audio signals on a tape traveling along a certain running path of a traveling system, wherein the tape T is connected to one side of the pinch roller 15 when the tape T runs forward. The first optical sensor is mounted to detect the loose state, and includes a light emitting unit 31 for emitting an optical signal on the tape T and a light receiving unit 32 for detecting the optical signal reflected from the tape T. 30 is mounted between the audio / control head assembly 14 and the pinch roller 15 to detect the looseness of the tape T when the tape T is driven backward. A second optical sensor 40 comprising a light emitting portion 41 for emitting a signal, a light receiving portion 42 for detecting an optical signal reflected from the tape T, and the first and second optical sensors 30; Detecting the loose state of the tape (T) by the detection of 40 And a controller (50) for controlling a running state of the tape (T). According to claim 1, wherein the first and second optical sensors 30, 40 is an optical signal of the light emitting portion 31, 41 is transmitted by the tape (T) in the normal driving state of the tape (T). Tape unwinding device of the tape recorder, characterized in that provided so as to be opposite to the recording surface of the tape (T) to be reflected and detected by the light receiving portion (32).