KR900002660B1 - Cassette tape recorder - Google Patents

Abstract

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Description

Cassette tape recorder

1 is an essential part explanatory diagram which shows the stationary state in this invention.

2 is an explanatory diagram of main parts in reproducing according to the present invention.

* Explanation of symbols for main parts of the drawings

4: capstan 4a: capstan gear

5: reel 6: reel

5b: reel replacement car 5c: reel replacement car

8a: tape 14: pinch roller

14a: pinch roller car 20: lock plate

21: lever 21b: fixed shaft

25: median difference of FIG. 1 26: median difference of FIG. 2

27a: Intermediate clutch of FIG. 3 27b: Intermediate clutch of FIG. 3

The present invention relates to a cassette tape recorder having a mechanism (hereinafter referred to as a shot-off mechanism) that returns to a stopped state from a playback or recording state when the magnetic tape reaches its end while running the tape.

Conventionally, in the shot-off mechanism, a mechanism using a driving force such as a plunger by electrically detecting the end of the tape and a mechanism using a rotational power of the flywheel, which is detected by an increase in the tape tension force at the end of the tape, has been developed. In some cases, the device using the plunger is expensive due to the large size of the device, and there is a problem such as noise generated during the operation of the plunger, and also the device and the sound quality may be degraded by the tape tension. There is a drawback that a large load on the tape running. In addition, the method of turning off the power of the motor has a problem such as deforming the pinch roller by leaving the capstan crimping time of the pinch roller for a long time.

The present invention is to mechanically detect the end of the tape in order to perform the shot-off operation mechanically in view of the above problems, as a simple structure and an ideal mechanism that can be instantaneously shotoff operation based on the accompanying drawings More detailed description is as follows.

In the cassette tape recorder of the magnetic tape winding type sent by the capstan 4 and the pinch roller 14 at a constant speed, in synchronism with the capstan gear 4a and the pinch roller 14 which rotate in synchronization with the capstan 4. The agent which transmits the power of the reel gear 5b, 5c which drives the reel 5 which winds the rotating pinch roller tooth 14a and the magnetic tape 8a, and the capstan gear 4a to the reel tooth 5b. 3rd intermediate | middle gear 27a which made the rotational force of the intermediate gear 25 of 1 and the reel gear 5b, 5c the circumferential speed of the said pinch roller tooth 4 and the circumferential speed of the pinch roller 14 become the same speed. (27b) A lever in which the second intermediate gear 26 is fixed at one end while the third intermediate gear 27a, 27b is pivotally fixed to the fixed shaft 21b, and is biased in the engagement direction of the gear. (21) is for returning the lock plate (20) to a stopped state when the tape (8a) is terminated. 3 is an erase head.

Referring to the operation and effects of the present invention configured as described above are as follows. FIG. 1 is an explanatory view of the main part of the compact cassette tape recorder, and FIG. 2 is an explanatory view of the main part of the shot-off mechanism.

The microcassette 8 indicated by the double-dotted line in FIG. 1 is positioned by the guide pins 9a and 9b, and the reel half 8b and 8c are respectively relieved by the reels 6 and 5. . The motor 1 indicated by the broken line is fixed to the chassis (not shown), and the motor pulley 1a is fixed to the output shaft, and the capstan 4 is pushed into the center hole of the flywheel 3 and integrated by the number of axes not shown. The pinch roller 14, which is arranged to rotate in the direction of the pinch roller 14, is pinched on the one end of the pinch arm 15, and the pinch arm 15 is freely rotatably supported by the pinch roller shaft 14b. The other end of is fixed to the fixed shaft 21b fixed to the chassis (not shown). In addition, the pinch arm 15 is provided with a spring (not shown) to rotate the pinch arm 15 in a counterclockwise direction, so that the pinch roller 14 is connected to the capstan (1) by the fixing pin 16 directly connected to the regeneration lever 18. It is impeded to press on 4).

The stop lever 17, the regeneration lever 18, and the recording lever 19 are slidably supported in the direction of arrow A and in the opposite direction, and a spring not shown is used to move each lever 17, 18, 19 of the arrow A. Each is mounted so that it can be shot in the reverse direction.

The rest of the high speed lever, the return lever, and the like are designed to be omitted. The magnetic head 11 and the tape guide 12 are fixed to the upper surface of the regeneration lever 18, and the lock pin 18a engaging with the lock plate 20 is directly installed on the rear surface of the regeneration lever 18. A release pin 17a engaged with the lock plate 20 is directly installed on the rear surface of the lever 17. The lock plate 20 has a stop lever 17, a regeneration lever 18, and a lower side of the recording lever 19. Is excreted. In addition, the lock plate 20 is provided with long holes 20c and 20d fitting to the guide pins 10a and 10b directly installed on the chassis (not shown), and the lock plate 20 is attached to the ordinary spring 23. And the inclined surface 20b is formed so that the lock plate 20 may move to the right direction when the release pin 17a moves to the arrow A direction.

The lock plate 20 is provided with a cap end portion 20a that engages with the lock pin 18a when the lock pin 18a moves in the direction of arrow A. FIG. When the regeneration lever 18 is pushed in the direction of the arrow A and the lock pin 18a is locked to the cap end 20a formed on the lock plate 20, the pinch roller 14 clamps the magnetic tape 8a while the capstan 4 is held. Is pressed, the tape support 8d is pressed while the magnetic head 11 sandwiches the magnetic tape 8a.

At this time, the tip of the regeneration lever 18 engages with a separate lever, not shown, and engages the first intermediate gear 25 with the reel tooth 5b while chipping the capstan tooth 4a. Therefore, the magnetic tape 8a conveyed at constant speed by the capstan 4 and the pinch roller 14 is wound around the half 8c without sagging.

Next, when the stop lever 17 is pressed in the direction of arrow A, the release pin 17a presses the inclined surface 20b and moves the lock plate 20 in the right direction against the spring force of the spring 23, The engagement between the lock pin 18a and the cap end 20a is released. The lever 21 is pivotally rotatable around the fixed shaft 21b, the return pin 21a protrudes from the lower end of the lever 21, and the second intermediate gear ( 26 is rotatably fitted around the shaft 21c, and a spring 24 is installed in the lever 21 so that the lever 21 is rotated in a clockwise direction so that it is directly connected to the chassis (not shown). The fixed pin 22 is pressed.

When the tension of the spring 24 is applied during regeneration, and the action force acts on the lever 21 in the counterclockwise direction, the return pin 21a moves the lock plate 20 to the right direction, and is regenerated with a spring (not shown). Return the lever 18. Next, a mechanism for detecting and shooting off the tape termination state will be described with reference to FIG.

The thing of the 1st degree and the same member is represented using the same symbol. The capstan gear 4a rotates integrally with the capstan 4 and is meshed with the first intermediate gear 5.

The first intermediate gear 25 is engaged with the reel gear 5b during regeneration (recording) or high-speed transfer, and is engaged with the intermediate gear 25a when rewinding. The reel gear 5b and the reel gear 5c are integrally molded, rotate about the reel shaft 5a, and transmit torque to the reel 5 of FIG. 1 through a friction plate (not shown).

The third intermediate gear 27a and the intermediate gear 27b are integrally formed to rotate about the fixed shaft 21b, and the intermediate gear 27a meshes with the second intermediate gear 26. It is. The pinch roller shaft 14b is rotatably supported by the pinch arm 15 and rotates integrally with the pinch roller 14. The pinch roller tooth 14a is fixed to the lower end of the pinch roller shaft 14b, and this pinch roller tooth 14a is meshed with the intermediate displacement 27b. The first intermediate gear 5 is rotated by the capstan gear 4a, and the reel counterbalance 5b is rotated by the first intermediate gear 25.

(Referred to as the first transmission) The pinch roller 14 and the pinch roller tooth 14a are rotated by the capstan 4, and the third intermediate clutch 27b is driven by the pinch roller tooth 14a, The intermediate gear 27a and the second intermediate gear 26 are rotated, and the reel small gear 5c is rotated by the second intermediate gear 26 (called second transmission). In the first transmission, the reduction ratio is determined so that the rotational speed of the reel gear 5c is the same as the rotational speed of the reel gear 5c in the second transmission.

Therefore, the pinch roller 14 has two forces during the tape travel: friction force by the capstan 4 and gear transmission force by the first and second transmissions.

When the magnetic tape 8a ends and stops, the pinch roller 14 is stopped by friction with the magnetic tape 8a, and the pinch roller tooth 14a, the intermediate clutch 27b, and the second intermediate gear 26 are stopped. Will also stop. However, at this time, the capstan 4 continues to rotate to rotate the reel small car 5c. Therefore, in the engagement portion between the second intermediate gear 26 and the reel small gear 5c, the teeth of the small gear 5c push up the teeth of the second intermediate gear 26. As shown in FIG. Therefore, the lever 21 is rotated in the direction of the arrow B from the fixed shaft 21b as a starting point, and the lock plate 20 is moved in the right direction by the rotation of the lever 21, so that the lock pin 18a and the cap are rotated. The engagement of the ends 20a is released.

As described in the above description, according to the present invention, the object described at the outset can be achieved to achieve the effect. However, although the experimental example demonstrated using the ultra compact cassette tape recorder, it is also common to a normal cassette tape recorder and an autoreverse device.

Further, according to the present invention, since the pinch roller 14 is rotated by friction between the capstan 4 and the magnetic tape 8a, the magnetic tape 8a is reliably rotated by the first transmission and the second transmission. It is a revolutionary invention that is sent at a constant speed without slipping, and the tape speed deviation is also improved.

Claims (1)

In the cassette tape recorder of the magnetic tape winding type sent by the capstan 4 and the pinch roller 14 at a constant speed, in synchronism with the capstan gear 4a and the pinch roller 14 which rotate in synchronization with the capstan 4. The agent which transmits the power of the reel gear 5b, 5c which drives the reel 5 which winds the rotating pinch roller tooth 14a and the magnetic tape 8a, and the capstan tooth 4a to the reel tooth 5b. The rotational force of the intermediate gear 25 and the reel gear 5b, 5c of 1 is transmitted to the pinch roller gear 14a, and the circumferential speed of the capstan 4 and the circumferential speed of the pinch roller 14 are the same at the time of recording and reproduction. While the second intermediate gear 26 is fixed to one end of the second and third intermediate gears 26, 27a and 27b, the third intermediate gears 27a and 27b are fixed shafts 21b. ), And the lock plate 20 is returned to the stop state at the end of the tape 8a by the lever 21 which is squeezed to the rotational material and is biased in the engagement direction of the gear. Cassette tape recorder.

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