JPH0413775Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a detection arm device for a cassette tape recorder that detects the presence or absence of a cassette tape's erroneous erasure prevention claw, equalizer characteristics, and identification indentation of a metal tape.

A conventional detection arm device of the type described above for a cassette tape recorder is shown in FIG.

That is, the detection arm _a1 is rotatably supported on a support shaft 2, and when the tip of the detection arm _a1 has to be retracted to attach the cassette half, it is pivoted on another shaft _a3 . One end of the shift arm _a4 was pushed by a solenoid or the like, and the shift arm _a4 pushed down the detection arm _a1 , causing its tip to retreat.

Therefore, in addition to the space required for the detection arm _A1 , a space is required for the shift arm _A4 , and this extra space results in a poor space factor, which not only hinders the miniaturization of the tape recorder. However, due to the large number of parts, assembly work was not efficient and costs were high.

The purpose of this invention is to retract the detection arm by rotating the support that pivots the detection arm, improve the space factor, reduce costs, and eliminate the drawbacks of the conventional technology. .

An example of implementing the present invention will be described below with reference to the drawings.

Reference numeral 1 designates a mode switching motor, whose rotation is transmitted through a belt 2 to a gear 4 having a pulley 3, and a large gear 5 meshing with this gear 4 rotates at a reduced speed.

An angle sensor 6 is provided on the shaft of the large gear 5, and is adapted to stop the motor 1 when the large gear 5 rotates to a position for a desired mode such as playback or fast forwarding.

A gear 8 having the same diameter meshes with a gear 7 integrated with the large gear 5 to rotate the laminated cam 9 at the same angle as the rotation angle of the large gear 5. a first cam part 9a that contacts and operates the cassette half; a second cam part 9b that contacts and operates the trochanter 12 of the driven arm 11a of the half holding member 11; and a door that accommodates the cassette half and opens and closes it. The third cam portion 9c contacts and operates the contact surface 14a of the door opening/closing arm 14 that engages with the third pin 13a.

On the other hand, the support shaft 15 supported by the chassis A is inserted into the half holding member 11, and the half holding member 11 has a pressing part 11b and a laminated cam in the center thereof for pressing the cassette half downward from the top. a driven arm 11a having a rotor 12 that rolls on a second cam portion 9b of 9; a first detection arm 16 that detects whether a claw for preventing accidental erasing of the cassette half is broken; and a first detection arm 16 that identifies a metal tape. A second detection arm 17 is provided in the center of the cassette half to detect whether or not there is a recess, and since the equalizer characteristics are different, a second detection arm 17 is provided next to the nail for preventing accidental erasure on the metal tape or chrome tape cassette half. The third step is to detect the presence of a depressed area.
Support portions 11c ₁ , 11 into which the detection arm 18 is fitted
c ₂ and 11c ₃ are integrally molded.

A small protrusion 11d is formed downward on both side walls of the support portions 11c ₁ , 11c ₂ , 11c ₃ , and a projecting arm 1 is formed from one side.
1e stands out.

In addition, the first detection arm 16 and the second detection arm 1
7. The third detection arm 18 has protrusions 16a, 17a, 18a for detecting the presence or absence of an object to be detected, respectively.
and a small protrusion 16 placed on the protrusion arm 11e.
b, 17b, 18b, and supporting portions 11c ₁ , 11
Fitting parts 16c, 17c, 1 that fit into c ₂ , 11c ₃
8c is formed in a U-shape that opens in a direction perpendicular to the projecting pieces 16a, 17a, and 18a.

Therefore, from the state shown in FIG.
Rotate it to each support part 11c ₁ , 11c ₂ , 11c ₃ ,
After inserting between this and the small protrusion 11d, if the fitting parts 16c, 17c, 18c are rotated in the opposite direction by 90 degrees, the opening of the fitting parts 16c, 17c, 18c and the small protrusion 11d are located on the opposite side, so that the supporting parts 11c ₁ , 11c ₂ , _11c3 , and the small protrusions 16b, 17b, 18b are placed on the projecting arm 11e.

The driven arm 11a has a spring 19 between it and the chassis A in order to bias the pressing part 11b downward, and the door opening/closing arm 14 has a support shaft in order to bias the door 13 in the direction of opening. Both ends of a spring 20 wound around 15 are installed between the chassis A and the chassis A.

Further, the first detection arm 16 is provided with an arm rod 16d that notifies the detection device when the protrusion 16a is lowered due to a broken accidental erasure prevention claw and disables the erasing operation, and also has a spring. One end of the protrusion 21 is installed to bias the projecting piece 16a downward.

Piano wires 17d and 18d are attached to the second detection arm 17 and the third detection arm 18, and these are connected to the operating pieces 23 that are biased upwardly of the switch 22, respectively.
The projecting pieces 17a and 18a are biased downward by being installed above.

Now, the laminated cam 9 rotates in the direction of arrow C and the second
Before reaching the position shown in the figure, the first cam portion 9a comes off the protrusion 10a of the door locking pawl 10, and
The tip is biased upward by the force of the spring 24 installed at 0 and locks the door opening/closing arm 14, and the third
The cam portion 9c is the contact surface 14a of the door opening/closing arm 14.
is pushed against the spring 20 to close the door 13.

The driven arm 11a is located in the concave portion of the second cam portion 9b, and is pushed by the spring 19 into the pressing portion 11b.
However, as the laminated cam 9 rotates in the direction of arrow C, it becomes the state shown in FIG. pressed by the pressing part 11b
and the detection arm 1 by the protrusion arm 11e.
6, 17, 18, the small protrusions 16a, 17a,
By pressing 18a, the cassette half is pushed up, and the cassette half is released from being held down and the detection is released.

Next, the protrusion 10a of the locking pawl 10
At the same time as the door opening/closing arm 14 is released from the lock by being pushed by the protrusion of the third cam part 9c, the pressure on the contact surface 14a by the third cam part 9c is gradually released. pin 13a
The door 13 is opened via the pin 13a, but the opening operation is limited by a damper 25 connected to the pin 13a, and the opening operation is gradual.

When the opening operation of the door 13 is completed in this way,
The protrusion of the first cam part 9a passes the protrusion 10a,
The tip of the locking pawl 10 rises due to the force of the spring 24, and becomes ready to lock when the door 13 is manually closed.

Next, when the cassette is housed in the door 13, the door 13 is manually closed and locked as described above, or the play operation is performed as it is, the laminated cam 9a rotates in the direction opposite to the arrow C, and the third The cam portion 9c pushes the contact surface 14a to rotate the door opening/closing arm 14 against the spring 20, and moves the door 13 in the direction of closing via the pin 13a.

The first cam portion 9a pushes the protrusion 10a to temporarily release the locking of the door opening/closing arm 14 by the locking pawl 10, but when the door 13 has been closed as described above, the first cam portion 9a pushes the protrusion 10a and 1 cam part 9a comes out of contact, and the door opening/closing arm 14 is moved to door 1.
The locking pawl 10 locks in the closed state of 3 to prevent the door 13 from opening during play.

Next, the recess of the second cam part 9b moves to the trochanter 12, and the driven arm 11a rotates by the force of the spring 19, so the pressing part 11b rotates downward, pushing the upper part of the cassette half downward. Press to set the cassette half in place.

At the same time, the projecting arm 11e also rotates downward, so that the small projections 16b, 17b, 18b
Each of the detection arms 16, 17, 18 on which the data is placed is also rotated by the force of the spring 21 and the actuating piece 23 of the switch 22 so that the projections 16a, 17a, 18a thereof are lowered, and the accidental erasure prevention claw and recess are rotated. The operating range of the switch 22 differs depending on the presence or absence of the switch 22.
It is something that can be detected by being turned on and off.

As described above, the present invention rotates the support part that supports the detection arm, so that the projecting arm protruding from the support part pushes up the detection arm, and the detection arm is connected to the accidental erasure prevention claw of the cassette half. Since it is evacuated from the identification recess, the support part serves as both the support shaft of the detection arm and the shift arm, eliminating the need for the shift arm and its shaft as in the past, and therefore saving only the space required for these. The space factor is improved, and the cassette tape recorder can be made smaller.

Furthermore, since a shift arm is not required, the number of parts is reduced, and the cost of parts can be reduced, and the assembly cost can be reduced by simplifying the assembly process, thereby making it possible to reduce costs.

Furthermore, when the support part rotates in the opposite direction, the push-up of the detection arm by the projecting arm is released, so the detection arm can freely descend, making sure that the accidental erasure prevention claw is not broken off and the identification indentation is not removed. If not,
Its descent is blocked by the upper surface of the cassette half,
Its presence or absence can be detected.

[Brief explanation of the drawing]

FIG. 1 is a schematic side view of a conventional detection arm device for a cassette tape recorder, FIGS. 2 to 5 show an example of the implementation of the present invention, FIG. The figure is a side view, FIG. 4 is a perspective view of the main part, and FIG. 5 is an exploded view. 11c ₁ , 11c ₂ , 11c ₃ ... support part, 11e ...
...Protrusion arm, 16, 17, 18...detection arm.

Claims (1)

[Scope of utility model registration request] The surface of the detection arm rotatably supported on the support in the detection operation direction overlaps the surface of the projecting arm protruding from the support, and the rotation of the support causes the detection arm to move in the non-detection direction. 1. A detection arm device for a cassette tape recorder, characterized in that the detection arm is interlocked with the rotation of the support portion in the opposite direction, but is not interlocked with the rotation of the support portion in the opposite direction.