JP3963056B2 - Brake mechanism of cassette tape recorder - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a logic-type cassette tape recorder including a remote control operation, and more particularly to a control mechanism linked to a head base.
[0002]
[Prior art]
Conventionally, in the operation mode of the tape recorder, the three functions of detecting the operation of the head base by the mode switch, the reel brake at the time of operation stop and the prevention of the eject operation during the recording / reproducing operation have been performed by independent mechanisms. . For example, in the conventional tape recorder schematically illustrated in FIG. 3 and FIG. 4 in the operation pause mode and the recording / reproducing mode, the arms 103, 104, 105, 106 having special shapes are extended in all directions. The brake lever 102 is rotatably supported and is urged clockwise by a spring 107. As the head base 101 moves to the recording / reproducing position (arrow F), the projecting piece s of the first interlocking arm 103 engages with the inclined portion t of the head base 101 and interlocks along the inclined surface while operating the brake lever. 102 is turned counterclockwise (arrow C).
[0003]
The second unwinding reel brake arm 104 and the third take-up reel brake arm 105 of the brake lever 102 are engaged with gears 110 and 111 concentrically fixed to the reel shafts 108 and 109, respectively, and the reel shafts 108 and 109 are engaged. Apply brakes to stop. At this time, the take-up reel brake arm 104 is rigid so that the take-out reel comes to a stop, and the take-up reel brake arm 105 is made elastic so that the take-up reel follows and stops. It is. Then, the fourth motion detection arm 106 closes the mode switch 112 and issues a signal notifying that the head base 101 is in the operating position.
[0004]
Further, an eject lock lever 113 engaged with the head base 101 is interlocked with the movement of the head base 101. That is, when the head base 101 is moved to the recording / reproducing operation position, the eject lock lever 113 turns clockwise (arrow K) and turns around the lower side of the push-type eject lever 114. Preventing the downward movement (arrow D). As described above, in the conventional mechanism, at least two points of the brake lever 102 and the eject lock lever 113 for operating the mode switch 112 are required. Reference numeral 115 denotes a recording / reproducing head, and 116 denotes a running position of the magnetic tape.
[0005]
[Problems to be solved by the invention]
Such a mechanism functions by converting the linear motion of the head base 101 into a two-dimensional planar motion called a turning motion of the brake lever 102 and the eject lock lever 113. Therefore, along with this, parts such as a rotating shaft, a support member, and a return spring are attached, and a plane space that does not restrain the turning motion is required. The increase in the number of parts leads to an increase in expenses such as quality control, inventory control, and assembly adjustment in addition to the cost of the member itself. In addition, securing a planar space is not preferable in terms of downsizing and design of the apparatus because of the possibility of dead space intervention.
[0006]
Therefore, the present invention has a configuration that does not include a turning motion mechanism, and has a brake mechanism, a mode switch operation mechanism, and an eject lever safety mechanism to reduce the number of parts, and to reduce space and cost.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, a brake mechanism of a cassette tape recorder according to the present invention is a logic type equipped with a head base that is moved between a stop position and a recording / reproducing position by an assist cam that is rotationally controlled by a solenoid. In the cassette tape recorder, a control member that slides in conjunction with the movement of the head base is provided, and an operation mode detection switch operating portion that detects the operation state of the tape recorder and a function of the eject lever during operation are prevented. Forcibly ejecting and a brake for stopping the rotation of the reel.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of a brake mechanism for a cassette tape recorder according to the present invention will be described with reference to the drawings of one embodiment. FIG. 1A shows a head base 10 that separates the recording / reproducing head 12 from the magnetic tape 19 and a control member 18 having three functions of an operation mode detection switch actuating member 14, a forced ejection preventing member 15, and a brake member 16. FIG. 1B is a schematic side view illustrating a part of the cross-sectional view. In FIG. 1, the head base 10 is separated from the tape and is at the rest position R, and the tape feed reels 20 and 22 are braked by the brake member 16 of the control member 18.
[0009]
At this time, the brake claws 24, 26 of the control member 18 are inserted between the teeth of the gears 28, 30 concentrically fixed to the tape receiving reels 20, 22 and engaged with each other. The head base 10 engages a projecting piece 31 formed by bending a part of the rear edge located on the opposite side of the head surface 11 with a linear groove 33 provided in the main body chassis 32, and A linear groove 35 drilled on the head surface 11 side of the head base 10 is engaged with the recording piece 34 so that the recording / reproducing position P (see FIG. 2) at which the recording / reproducing head 12 contacts the magnetic tape 19 and the magnetic It is guided linearly between the rest position R separated from the tape 19.
[0010]
This linear movement is performed by a known means (not shown) by a system cam in which a cam follower 39 formed integrally with the head base 10 is cam-coupled. In other words, a system cam connected to the motor drive mechanism by controlled electromagnetic operation drives the cam follower 39 and linearly moves the head base 10 along the linear grooves 33 and 35.
[0011]
On the other hand, the control member 18 is provided with linear grooves 36 at three locations, and is fitted and respectively guided by projections 37 erected at three locations on the main body chassis 32. The control member 18 is connected to the head base 10 by a tension spring 38 and is urged to a close contact position, and interlocks integrally with the movement of the head base 10. However, even if the control member 18 is restrained by the projection 37, the tension spring 38 extends, so that the head base 10 can move to the rest position R without being blocked by the control member 18. At this time, the reel is braked by the brake function.
[0012]
When the head base 10 moves to the recording / reproducing position P, the control member 18 is pushed in the same direction by the front end portion 13, so that the brake claws 24, 26 are detached from the gears 28, 30, and the tape feed reel 20. , 22 are freely rotatable. At this time, the dog 40 projecting below the control member 18 presses the operation piece 42 of the operation mode detection switch actuating section 14 to close the electrical contact 43 and generate a signal for informing that the play mode is in progress ( (See FIG. 2).
[0013]
On the other hand, when the recording / reproducing head 12 is in the recording / reproducing position P in the play mode, whether the cassette deck door (not shown) is opened unintentionally or intentionally, the device may be damaged. The arm 45 extending to the side of the control member 18 functions as the forced ejection preventing member 15 so that the safety function is automatically activated.
[0014]
That is, when the head base 10 is at the recording / reproducing position P, the control member 18 is in the movement path (see arrow E in FIG. 1) of the interlocking member 46 that opens the cassette deck (not shown) for cassette ejection. Therefore, the opening of the cassette deck becomes impossible during recording / reproduction (play mode).
[0015]
Next, when the recording / reproducing head 12 is separated from the magnetic tape 19 and the head base 10 recedes linearly to the rest position R, the control member 18 connected by the tension spring 38 is pulled to the head base 10. Then it is followed and it moves back to the brake position. By this operation, the dog 40 integrated with the control member 18 is detached from the switch operation piece 42 to open the electrical contact 43 and stop the play mode signal. Further, since the arm 45 extending from the control member 18 is retracted to a position where it does not interfere with the movement of the deck opening operation interlocking member 46, the cassette deck door can be opened and the cassette can be taken out and replaced freely. (See FIG. 1).
[0016]
Further, at the brake position of the control member 18, the brake claws 24, 26 are sandwiched between the teeth of the gears 28, 30 integrated with the tape transmission / reception reels 20, 22 to force the tape transmission / reception reels 20, 22. Stop. The brake pawls 24 and 26 project from the ends of the elastic portions 50 and 51 extending inward from the outer frame of the control member 18, and the meshing position with the gears 28 and 30 is inward between the rotation centers of both gears. The direction is biased.
[0017]
That is, the rotation acts on the one of the tape delivery reels 20 and 22 rotating as the unwinding side in a direction in which the brake claws 24 and 26 bite between the teeth of the meshing gears 28 and 30. Moreover, it is the structure which accept | permits escape of the brake claws 24 and 26 from the gears 28 and 30 with which rotation is meshing with respect to the other tape delivery reels 20 and 22 rotationally driven as a winding side.
[0018]
Therefore, the brake claws 24 and 26 act so that the winding side of the tape receiving reels 20 and 22 is rigidly braked and the winding side is elastically braked. 22 functions to stop while applying tension to the magnetic tape 19.
[0019]
【The invention's effect】
As described above, according to the brake mechanism of the cassette tape recorder according to the present invention, the three functions of operation mode detection switch operation, forced ejection prevention and brake can be achieved with only one control member. Scores and costs are reduced, and parts management becomes easier.
[Brief description of the drawings]
FIG. 1 is a schematic explanatory view of a resting state in which a brake mechanism of a cassette tape recorder according to the present invention is functioning, (a) is a plan view and (b) is a side view.
2A and 2B are schematic explanatory views of a recording / reproducing state in which a brake mechanism of a cassette tape recorder according to the present invention is released, in which FIG. 2A is a plan view and FIG. 2B is a side view.
FIG. 3 is a schematic plan view for explaining a resting state in which a brake mechanism of a conventional cassette tape recorder is functioning.
FIG. 4 is a schematic plan view for explaining a recording / reproducing state in which a brake mechanism of a conventional cassette tape recorder is released.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Head base 12 Recording / reproducing head 14 Operation mode detection switch actuating member 15 Forced ejection prevention member 16 Brake member 18 Control member 20, 22 Tape feed reels 24, 26 Brake claw 28, 30 Gear 38 Tension spring 43 Electric contact 45 Arm

Claims (1)

In a logic type cassette tape recorder having a head base that is moved between a stop position and a recording / reproducing position by an assist cam that is rotationally controlled by a solenoid, a control member that slides in conjunction with the movement of the head base is provided. The control member is formed with an operation mode detection switch operating portion for detecting the operation state of the tape recorder, a forced ejection preventing portion for preventing the operation of the eject lever during operation, and a brake for stopping the rotation of the reel. The cassette tape recorder brake mechanism.

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