KR940001110Y1 - Auto-stop switching device of tape recorder - Google Patents

Abstract

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Description

Switch actuator for automatic stop of tape recorder

1 is a schematic exploded perspective view of the main part of the present invention.

2 is a plan view showing a tape running state of the present invention.

Figure 3 is a plan view showing the locking state of the sensor cam gear and the sensor arm at the end of running the tape of the present invention.

Figure 4 is a plan view of the power supply switch is operated at the end of the tape run of the present invention.

5 is a plan view showing the operation state of the pinch arm by the forward operation of the eject lever.

6 is an enlarged longitudinal sectional view of the cam arm held on the leaf spring by the forward operation of the pinch arm operating lever of the present invention showing a return operation from the original position.

* Explanation of symbols for main parts of the drawings

1: expectation 2: head

8: cam arm 8a: working piece

8b: Square opening 8c, 8d: Bending stone piece

13 sensor arm 13a: fixed protrusion

14: upper sliding protrusion 15: lower sliding protrusion

15a: projection 16: "***" bending bent piece

17: leaf spring 17a: pressed part

18: set screw 20b: operating lever

20c: bending piece

In the tape recorder for automobiles, the reel sensor operation of the reel stops when the tape stops running, and the sensor cam gear and the sensor arm interlock with each other to rotate to rotate the cam arm built up with the sensor cam gear and the fixing pin. The cam arm is locked by the locking member and at the same time the power supply switch is operated by the operation piece formed in the front portion of the tape recorder to stop the automatic drive switch operating device for automatic stop.

In general, there is an urgent need for an automatic power shut-off device that detects when the tape stops running and automatically shuts off the driving power of the motor to prevent the tape recorder from extending its life and excessive power consumption.

Therefore, in order to achieve the above object, a device for automatically detecting the power supply and stopping the power supply switch when the driving of the tape is finished has been devised in various ways.

However, the above-described systems are used because the transmission system between the operating members for activating the power supply switch is operated by the cam and the cam and the power supply switch is operated by successive operations of a plurality of operating levers cooperating thereto. The time difference and configuration are very complicated, and therefore, the overall size is increased according to the importance of the number of parts, and there is a manufacturing problem because the precision and accurate connection operation of each part are required. Failure to do so may result in a high failure rate due to malfunctions resulting in a shortened life.

It is therefore an object of the present invention to provide a tape recorder having an automatic stop switch operation device capable of solving all the above problems without affecting the automatic stop switch operation function.

The present invention provides a continuous motion member such as a capstan shaft and a flywheel that continuously operate a drive door to a tape drive motor, a sensor cam gear interlocked thereto, a reel for driving the gear with the sensor cam gear, and an operation rest of the reel sensor of the reel. At the end of the tape running), the sensor arm which blocks the rotation transmission path from the sensor cam gear to the reel driven by the gear, and the operating force of the continuous operating member when the sensor arm and the sensor cam gear are in the operating position. In order to supply power to the drive motor by forming a power blocking member for moving the power supply switch for the purpose of power supply to cut off the power supply, and a locking member forming a standby state of the power blocking member. It is intended to provide the simplification of the power supply switch operation (power off) transmission system.

In addition, the head support plate is moved forward by the eject lever, so that the engaging portion of the head support plate pushes the latch lever of the pinch arm so that the pinch arm is rotated to the fixed shaft point and the power source held by the locking member by the operation lever formed on the other side. It is possible to return the blocking member (cam arm) to its original position and to provide a standby state of the tape recorder.

In order to achieve the above object, the present invention simplifies a sensor cam gear having an eccentric circular cam and a super crescent cam, a sensor arm having a unique shape interoperating with the sensor cam gear, a cam arm tangled with the cam arm, and a leaf spring for locking the cam arm. It is characterized by operating the power supply switch by the operating member.

In addition, the present invention forms a locking lever and an operating lever in the pinch box so that the head support plate moves forward during the forward operation of the eject lever, so that the operating lever of the pinch arm, which interlocks with each other, presses the locking member to return the cam arm to its original position. It is another feature of providing operation.

Hereinafter will be described in detail with reference to the accompanying drawings.

1 is a schematic exploded perspective view of a main part of an automatic stop switch operating device of a tape recorder according to an embodiment of the present invention, which is mainly composed of an automobile cassette type tape recorder.

Since a cassette type tape recorder is well known, this drawing shows only the part related to this design.

That is, as shown in the attached drawings 1 to 5, 1 is the base, 2 is the head, and one side of the head 2 is arranged on the capstan shaft 3 fixed shaft 4a and pinch rollers ( A pinch arm 4 having 5) and a reel 6 having a reel gear 6a and a reel sensor 6b are arranged in a symmetrical relationship, respectively.

The capstan shaft 3 is attached with a fly wheel 7 having a drive gear 7a. The cam arm 8 is disposed on the capstan shaft 3 by a fixing pin 9 and disposed as a moving material. An operating piece 8a and a rectangular opening 8b are formed in the front portion of the cam arm 8. In addition, the bending stone piece 8c formed on one side is circulated in the guide slit (not shown) of the base 1, and the bending stone piece 8d of the other side is wound around the fixed shaft 4a of the pinch arm 4, It is supported by one side of the torsion spring 10 held on one side of the base 1 so that a force is applied in the reel 6 direction.

A sensor cam gear 11 is arranged on the cam arm 8 by means of a fixing pin 12 and gear-coupled with a drive gear 7a of the capstan shaft 3 and a reel gear 6a of the reel 6. .

The sensor cam gear 11 is formed with an eccentric circular cam 11a, and a super crescent cam 11b protrudes from the upper surface thereof.

On the base 1, the sensor arm 13 is swept by the fixing protrusion 13a so that the lower sliding protrusion 15 and the upper sliding protrusion 140 having the lower protrusion 15a are formed on the cam arm 8 and the sensor cam gear ( 11) is placed to agitate the outer circumferential edge of the eccentric circular cam 11a, and the "***" type bent carbon support piece 16 formed on the other side is formed.

Further, on one side of the base 1, a pressing portion 17a having an inclined surface portion α is formed, and a leaf spring 17 on which the locking projection piece 17b protrudes is attached to the fixing screw 18. The leaf spring 17 is installed so that the square opening 8b is engaged with the cam arm 8 when the cam arm 8 is rotated.

In the state where the cam arm 8 is locked by the leaf spring 17, the pressing portion 17a is always pressed downward by the bent piece 20c of the operating lever 20b formed on one side of the pinch arm 4. The engaging lever 20a formed on the other side is engaged with the engaging portion 19a of the head support plate 19.

In the drawings, reference numeral 21 denotes a locking protrusion protruding on the base 1, 22 a cassette tape holder, 23 a torsion spring supported on the fixed shaft 4a of the pinch arm 4, and 24 a sensor arm 13. A projection that determines the operating limit of, 25 is a power supply switch, 26 is an eject lever, 27 is an operation stone piece integrally formed on the head support plate (19).

The operation and effects of the present invention configured as described above will be described with reference to FIGS. 2 to 5. That is, FIG. 2 shows the operation state when the tape is running. The driving motor M transmits power to the flywheel 7 by belt (not shown) to drive the drive gear 7a of the capstan shaft 3. The sensor cam gear 11 geared thereto rotates clockwise, and the reel gear 6a of the reel 6 geared with the sensor cam gear 11 rotates counterclockwise.

Therefore, the reel 6 is rotated so that the tape travels under the guidance of the pinch roller 5 and the capstan shaft 3.

The cam arm 8 residing on the capstan shaft 3 is always in a state of receiving force in the direction of the reel 6 by the holding force of the torsion spring 10, so that the cam pin 8 is fixed to the cam arm 8 by the fixing pin 12. The built-in sensor cam gear 11 maintains a gear-coupling state firmly with the reel gear 6a so that a malfunction does not occur when the tape travels.

As the sensor cam gear 11 rotates, the outer periphery of the eccentric circular cam 11a and the upper sliding protrusion 14 and the lower sliding protrusion 15 of the sensor arm 13 are mutually contacted with each other to fix the fixing protrusion 13a. Rotate to the point to operate up and down.

The up and down operation of the sensor arm 13 is always a force in the direction of the reel (6) by the holding force of the torsion spring 10 supported by the bending stone piece (8c) of the cam arm (8), but the rotation of the reel gear (6a) The reel sensor 6b disposed on the upper side of the sensor arm 13 pushes the “***” shaped bending coalescing member 16 of the sensor arm 13 to maintain the balance so that the eccentric circular cam 11a of the sensor cam gear 11 is maintained. Eccentric cam (14, 15) of the upper and lower sliding protrusions (14) and (15) of the sensor arm (13) by preventing the detachment to the upper surface of the () to prevent the super crescent cam (11b) and the upper sliding protrusion 15 is engaged. It slides along the outer periphery of 11a) to achieve vertical operation.

At this time, the vertical movement amount is restrained by the protrusion 24 placed in the long groove (not shown) of the base (1).

When the running of the tape is finished, as shown in FIG. 3, the reel sensor 6b, which is applied upward (in the drawing) to the "***" shaped bending finger piece 16 of the sensor arm 13 at all times, is shown. The operation is stopped and the reel gear 6a is continuously rotated by the rotation of the sensor cam gear 11.

At this time, the sensor cam gear 11 is rotated in the clockwise direction and the upper and lower swivel sensors by the eccentric circular cam 11a while the cam arm 8 is always being pushed by the torsion spring 10 in the reel 6 direction. The arm 13 is rotated while being pushed inward, and with the help of the protrusion 15a integrally formed at the lower side of the lower sliding protrusion 15, the upper sliding protrusion 14 is separated from the upper surface of the eccentric circular cam 11a. The cam arm 8 is pushed in the direction of the arrow in engagement with the crescent cam 11b.

According to the above operation, as shown in FIG. 4, the sensor cam gear 11 is dropped from the reel gear 6a so that the reel 6 is stopped and the drive gear 7a of the capstan shaft 3 is driven. As a result, the cam arm 8 continues to move forward (this operation is almost continuously connected) and is stopped by the locking portion 21 on the base 1, and at the same time, the operating piece 8a of the front portion switches the power supply 25 ) To cut off the power and at the same time the cam arm 8 is latched by the rectangular opening 8b on the locking piece 17b of the leaf spring 17 and the power supply switch 25 is cut off from the power supply. I will wait.

When the above operation is completed, the tape is taken out from the cassette tape holder 22 by the operation of the eject lever 26. The operation relationship will be described with reference to FIG.

That is, when the eject lever 26 is advanced (arrow direction), the head support plate 19 which operates in conjunction with the eject lever 26 is moved forward (arrow direction).

At this time, the locking lever 20a of the pinch arm 4 engaged with the engaging portion 19a of the head support plate 19 is pushed, and the pinch arm 4 rotates the fixed shaft 4a to the point.

As the pinch arm 4 rotates, the bent piece 20c of the operating lever 20b of the other side is pressed while moving the inclined surface portion α of the depressed portion 17a of the leaf spring 17 (sixth). See also)

At this time, the locking piece 17b of the leaf spring 17 is lowered, and the cam arm 8 engaged with the square opening 8b returns to its original position by the holding force of the torsion spring 10, and the sensor gear 11 is The gear is engaged with the reel gear 6a again to be in the standby state.

However, the power supply switch 25 continues to maintain a state in which the power is cut off by the operation protrusion 27 of the head support plate 19.

In order to achieve the play operation of the tape recorder after the above operation, when the cassette tape is inserted into the cassette tape holder 22, the eject lever 26 returns to its original position, and thus the magnetic head support plate 19 is also reversed to This operation relationship is known because the play operation is made, detailed operation relationship will be omitted.

According to the present invention as described above, the operation relationship of the power supply switch can be directly transmitted as compared with the conventional one, and thus, the occurrence rate of malfunction is small, especially the number of parts can be greatly reduced, and at the same time, it is possible to simplify and reduce the overall cost of the device. It is a useful design.

Claims (4)

In a tape recorder in which the recorder by the reel sensor 6b is automatically stopped in response to the end of the tape running, the sensor arm 13 which rotates the cam arm 8 by elastically detecting the end from the reel sensor 6b. And a cam arm 8 for controlling the power supply switch 25 and a spring spring for controlling the cam arm 8 while the fixing pin 12 is operated and resiliently rotated according to the operation of the sensor arm 13. 17) and the cam arm 8 is configured to cut off the power supply switch 25 to cut off the power of the drive motor M at the end of the running of the tape. . The cam arm (8) according to claim 1, wherein the cam arm (8) is an obstruction of the work piece (8a) and the leaf spring (17) for operating the fixing pin (12) operated by the sensor arm (13) and the power supply switch (25). Switch operating device for automatic stop of the tape recorder, characterized in that formed by integrally forming a square opening (8b) to take the piece (17b). 2. The sensor arm (13) according to claim 1, wherein the sensor arm (13) integrates the bent finger piece (16) for elastically sensing the state of the reel sensor (6b) and the sliding protrusions (14, 15) for operating the cam arm (8). Switch operation device for automatic stop of the tape recorder, characterized in that consisting of. The apparatus of claim 1, wherein the leaf spring (17) is configured to integrally form the pressing portion (17a) and the locking piece (17b) to control the cam arm (8). .