KR950008681Y1 - Muting device of logic cassette deck - Google Patents

Abstract

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Description

Muting device of logic cassette deck

1 is a perspective view showing a schematic structure of a logic cassette deck to which the present invention is applied.

2 is a planar structural diagram of FIG. 1 showing a stop mode.

3 is a plan view showing the operation in the forward reproduction.

4 is a plan view showing the automatic operation in reverse recording.

5 is a plan view showing operation in the rewind mode.

* Explanation of symbols for main parts of the drawings

7: Head interlocking lever 7e: concave groove

7f: switching arm 11: contact switch

11a: movable contact 12: operating lever

13; Cam gear

The present invention relates to a cassette deck constituting a very small cassette tape recorder, and more particularly to a muting device of a logic cassette deck.

The mechanism provided in the cassette e recorder is generally composed of a control unit, a mechanism unit, a recording and reproducing unit, a receiver unit, a power supply unit, and a speaker. However, a small cassette tape recorder for the sake of easy portability is received in the above-described mechanism. It was early general practice to omit the base, the recording unit, and the speaker.

In recent years, when the trend of miniaturization of cassette tape recorders has progressed, ultra-small cassette tape recorders have been put into practical use. The need for a compact cassette tape recorder that combines is being proven.

In order to obtain a very small cassette tape recorder, there has been a trend to reduce the component parts of the mechanism, but this method should omit some of the functions that the cassette recorder should have, such as automatic repeat or radio reception. There is a flaw.

Recently, however, a method for minimizing a portable cassette tape recorder at a completely different angle has been proposed and gradually put into practical use, and this method is a logic type cassette deck adopted in a cassette deck of high-end audio. Is applied to a very small cassette tape recorder to improve the feel at the time of operation and to significantly reduce the volume of the mechanism.

Logic set deck is a combination of the sole profile that controls the path of the cam profile and the lever associated with it, and the lever that interlocks along the cam diagram formed on the cam profile, so that the selection of the function mode and accordingly the organic operation can be performed. Consists of.

According to this method, the structure of the machine bottom operation portion composed of a plurality of levers can be simplified to the electronic operation portion capable of soft touch, and a significant volume reduction effect can be obtained.

On the other hand, in a cassette tape recorder, when driving with no recording tape playback head in contact, such as a rewind or fast-forward mode, interference waves generated from the motor and the friction part may seep into the headphones and cause noise. In order to solve the problem, there is a need to have a muting circuit composed of contact switches switched on and off in conjunction with the playhead.

Conventional logic cassette decks have a mute device that is configured to turn contact switches on and off with a lever that interlocks with the playhead, resulting in an unnecessary increase in the number of parts, thereby increasing volume and difficulty in assembly. There is an undesired aspect as a very small cassette deck, such as resulting in poor productivity.

Accordingly, an object of the present invention is to provide a muting device having a structure suitable for application to a cassette deck and having good productivity.

In accordance with the above object, the present invention provides a logic cassette deck configured to select a function mode and perform an organic operation by a combination action of a lever interlocked along a cam diagram of a cam profile and a solenoid controlling the course of the lever. In this case, a switching arm having a concave groove on one side of the head interlock lever so that the path of the voice signal to the headphone can be closed when the actuating lever in which the cam gear is interlocked with the camp profile slides the head interlock lever. A normal contact switch is placed on the transmission path described above, and the contact switch is placed at a position where the movable contact can be opened through the recessed groove of the switching arm by moving the head interlocking lever. Winding degree is characterized in that the contact switch is configured to open in the rewind mode.

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

1 is a perspective view showing a schematic structure of a logic cassette deck to which the present invention is applied. The chassis 1 includes a drive motor 2, a pair of flywheels 3 and 4, and these flywheels 3; The gear pulley 6 receives the driving force through the belt 5 wound around the wheel 4.

The operation according to the function mode of the cassette deck starts with the movement of the geo-pulley 6 which is rotated forward and backward by the drive motor 2.

The head interlock lever (7), which is moved in accordance with the function mode selected by the user, is arranged at the lower side of the flywheel (3) and (4), and the rear of the chassis (1) faces the electric head interlock lever (7). A pair of erasing heads 9a and 9b and pinch rollers 10a and 10b are arranged on both sides of the reproducing head 8, respectively.

Then, the contact switch 11 is disposed between the drive motor 2 and the flywheel 4 to interfere with the head interlock lever 7 described above.

This contact switch 11 is interposed on a transmission path connected to the headphones.

FIG. 2 shows a plan view of the stop mode with the flywheels 3 and 4 and gear pulley 6 removed in FIG.

The head interlocking lever 7 has a flow groove 7a on one side of the outer circumferential surface, and one end roll 12a of the operating lever 12 is engaged with the weaning groove 7a.

The operation lever 12 is supported by the fixed shaft 13 so as to be able to swing, and on the other end thereof has a cam pin 12b which interlocks with a lower camp profile (not shown) of the cam gear 14. .

On the outer circumferential side of the cam gear 14, a cam drive gear 16 attached to the idler gear assembly 15 is engaged.

The idler gear assembly 15 receives the power of the drive motor 2 from the drive gear 6a integrally formed with the gear pulley 6, and the left and right driven gears 17 together with the cam gear 14 described above. One of (18) is driven to rotate simultaneously, and the stabilizer 19 is arrange | positioned around the electric machine assembly 15 mentioned above.

An optional gear connection of the idler gear assembly 15 to both driven gears 17 and 18 is disposed across the center of the cam gear 14 so as to interlock with the camp profile 14a. Determined by

On the other hand, the elevating groove 7b formed on the side of the flow groove 7a of the head interlocking lever 7 is engaged with an elevating roll 8a for controlling the position of the regeneration head 8, and the electric head interlocking lever described above. Interlocking pins 7c and 7d protrude downwardly on both sides of (7), and in order to interlock the above-mentioned contact switch 11, " "The switching arm 7f which has the magnetic recessed groove 7e is extended.

The erasing head lever 21 is installed side by side below the head interlock lever 7, and a locking lever 24 which is adsorbed and interlocked by the solenoid 23 with the shaft 22 as a point therebetween. It is arranged.

One end of the locking lever 24 has a permanent magnet 25 adsorbed to the solenoid 23 and a tension spring 26 for maintaining a constant distance between the solenoid 23 and the permanent magnet 25. Is provided, and the other end has a slide hole 29 to which the slide pin 28 of the latch 27 linked to the erase head lever 21 is engaged.

In the cassette deck to which the present invention is applied, the head interlocking lever 7 has a structure interlocked by one end roll 12a of the actuating lever 12, and the actuating lever 12 has its other end cam pin 12b. The lower camp profile of the cam gear 14 swings as it moves.

In addition, the rotation of the cam gear 14 is controlled as the pendulum arm 20 interferes with the idler gear assembly 15 to intervene between the cam gear 14 and the cam drive gear 17. The operation lever 12 is interlocked only in the reverse playback and the forward reverse recording mode.

Further, in the stop mode, the stoppering groove 7g of the head interlock lever 7 is locked at one end of the arm stopper 30 on the neutral side, but the arm stopper 30 is the upper camp profile of the cam gear 14. As instructed by (14a), the actuating lever 12 temporarily releases from the neutral side of the stopping groove 7g before the slide movement of the head interlocking lever 7 to release the head interlocking lever 7, The movable contact 11a of the contact switch 11 is located in the recess 7e of the switching arm 7f and is kept open.

The contact switch 11 is switched on when the head interlock lever 7 slides by the operation lever 12.

3 is a plan view showing the operation in the reverse recording mode. As the solenoid 23 adsorbs the permanent magnet 25, the locking lever 24 engages the latch 27 so that the erase head lever 21 The head interlocking lever 7 and the erasing head lever 21 slide together to be moved to the tape travel position, and the movable point 11a of the contact switch 11 is recessed groove 7e of the switching arm 7f. The transmission path to the headphone is opened because it is closed by being pressed by the side part forming the headphone.

The pendulum arm 20 interlocks the revolving gear assembly 15 to shut off the power to the cam gear 14 and to transmit power to the right driven gear 18 so as to always be connected to the right driven gear 18. The right reel 31 is rotated to drive the recording tape (not shown).

The closed state of the contact switch 11 is the same in the regeneration mode.

FIG. 4 is a plan view showing an operation state of the forward regeneration model. The difference from FIG. 3 is that the solenoid 23 does not suck the permanent magnet 25 of the rock knuckle 24, so that the latch 27 has an erase head. Since the lever 21 is not piggybacked on the head interlock lever 7, only the head interlock lever 7 slides by the operation lever 12, and the pen drum arm 20 of the idler gear assembly 15 is moved. The power is connected to the left driven gear 17 so that the left reel 32 is driven to rotate.

Even in such a forward regeneration state, the movable contact 11a of the contact switch 11 is closed away from the concave groove 7e of the switching arm 7f, and thus the transmission path to the headphones is opened.

As described above, when the head interlocking lever 7 is moved, the muting device of the present invention is pressed and closed while the movable contact 11a of the contact switch 11 moves away from the concave groove 7e of the switching arm 7f. This allows the audio signal to be transmitted to the headphones when the head interlock lever 7 slides in the recording or playback mode.

On the other hand, in the fast-forward and rewind modes, as shown in FIG. 5, the arm stopper 30 is engaged with the neutral side of the stoppering groove 7g, and the movement of the head interlock lever 7 is restrained. 20) the power of the idler gear assembly 15 is transmitted to either of the driven gears 17 and 18, so that the recording tape is rewound or fast-wound by traveling without contacting the playhead 8 or the like. .

In this process, since the head interlock lever 7 is not moved, the movable contact 11a of the contact switch 11 is positioned in the concave groove 7e of the switching arm 7f and is kept open. The path is blocked.

This prevents noise from seeping into the headphones.

As described above, the present invention adds a switching arm interfering with the movable contact of the contact switch to the head interlock lever that interlocks the play head in the play or record mode, thereby greatly increasing the number of parts and the volume without causing an increase in the number of parts. In fast-forward or rewind mode, noise can be prevented from being introduced into the headphones, which improves productivity by facilitating assembly and can be effectively applied to its compact cassette deck.

Claims (1)

In a logic cassette deck configured to select a function mode and perform an organic operation according to a combined action of a lever interlocking along a cam profile of a cam profile and a solenoid controlling the course of the lever, the cam gear 13 A switching arm 7f having a concave groove 7f0 is formed on one side of the head interlocking lever 7 which is slidably moved by the operating lever 12 interlocking with the camp profile of the The normal contact switch 11 is interposed on the transmission path, and the movable contact 11a of the contact switch 11 rides through the concave groove 7e of the switching arm 7f by the movement of the head interlock lever 7. Muting device for a logic cassette deck, characterized in that the contact switch 11 is arranged in a position to be opened and closed.