JPH0422429Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an eject mechanism in a cassette tape recorder, particularly a feather touch or soft touch type cassette tape recorder.

[Summary of the idea]

The present invention is a cassette tape recorder in which a magnetic head is moved by the force of a motor and inserted into a tape cassette, and the magnetic head can be removed from the tape cassette by removing the transmission gear of the drive system that moves the magnetic head. This allows the tape cassette to be taken out smoothly no matter what condition the cassette tape recorder is in.

[Conventional technology]

In recent years, so-called feather touch and soft touch type cassette tape recorders have been widely used. That is, in this type of cassette tape recorder, during play, the magnetic head is moved by the force of the drive motor, not by the operating force of the operating member, and is inserted into the tape cassette and brought into sliding contact with the tape.

However, in this cassette tape recorder, if the eject button is operated while the magnetic head is being moved, the tape cassette is forcibly ejected while the magnetic head is still inserted into the tape cassette. Or there was a problem that caused damage to the tape cassette.

Therefore, in conventional cassette tape recorders of this kind, for example, while the magnetic head is moving, a plunger is used to engage an engaging claw piece with the ejector lever so that the ejector lever cannot be operated. Also, a separate lever was used to cause the eject lever to swing idly within the eject mechanism.

[Problem that the invention attempts to solve]

The mechanism for preventing ejection during movement of the magnetic head in conventional cassette tape recorders is as follows:
Since the configuration is very complicated, there are disadvantages in that the number of parts is large and the number of assembly steps is increased. In addition, in conventional cassette tape recorders of this type, the magnetic head is moved in conjunction with the drive motor, so if the power is turned off while the magnetic head is still in the tape cassette, the eject operation cannot be performed. There is.

The present invention has been devised in view of the above, and an object of the present invention is to provide an eject mechanism for a cassette tape recorder that is simple in construction and allows a tape cassette to be taken out no matter what state the cassette tape recorder is in. With the goal.

[Means for solving problems]

In order to achieve the above object, the present invention provides a cassette tape recorder in which the magnetic head is moved by the force of a motor and inserted into a tape cassette, in which the magnetic head is attached to a return spring as a biasing member. Therefore, the head base is always biased in a direction backward relative to the tape cassette, the drive gear is driven by a motor, and the power of this drive gear is transmitted to the movable mechanism of the head base, and the magnetic head moves the head base toward the tape cassette. The transmission gear is made up of a transmission gear that moves the transmission gear forward in the direction in which it is inserted into the drive gear, and an eject lever that removes the transmission gear from the drive gear.

[Effect]

The measures described above operate as follows.

When the drive gear is rotated by the drive motor,
This rotational force is transmitted to the moving mechanism of the head base through the transmission gear, so that the head base moves forward against the biasing force of the return spring and the magnetic head is inserted into the tape cassette. When the ejector lever is operated during the movement of the magnetic head, the transmission gear is disengaged from the drive gear, and the head base is moved backward by the biasing force of the return spring, which means that the magnetic head is removed from the tape cassette. As a result, the tape cassette can be ejected without any problem.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

In the figure, reference numeral 1 generally shows a cassette tape recorder to which the present invention is applied. In this example, the cassette tape recorder 1 is designed to be used in a vertical position. Reference numeral 2 denotes a mechanical chassis of the cassette tape recorder 1. A tape drive mechanism (not shown) is provided on the back side of the mechanical chassis 2, and reel hubs 4a, 4b and a capstan 5 are mounted on the cassette mounting section 3 on the front side. A pinch roller 6 is arranged to protrude and correspond to the capstan 5.

The mechanical chassis 2 has a head base 7 that is slidable in a direction perpendicular to the tape running direction of the tape cassette A that is mounted on the cassette mounting section 3.
A magnetic head 8 is attached to the lower center of the head base 7.

This cassette tape recorder is of the so-called auto-reverse type, and in order to enable the tape to run in forward and reverse directions, a capstan 5 and a pair of pinch rollers 6 are provided on the left and right sides, and a magnetic head 8 is provided with a track. For this purpose, a rotary head is used which is rotated 180° about an axis perpendicular to the tape running direction.

The head base 7 is also supported by the biasing force of a return spring 11 stretched between a protrusion 9 protruding from one side edge of the head base 7 and a protrusion 10 protruding from the lower end of the mechanical chassis 2. The magnetic head 8 is always biased in the backward direction, that is, in the direction away from the tape cassette A mounted on the cassette mounting section 3. Further, an actuating piece 7a is formed on the upper edge of the head base 7 by being bent at right angles toward the mechanical chassis 2, and the actuating piece 7a is inserted into the mechanical chassis 2 through a window hole 2a bored in the mechanical chassis 2. The head base 7 is moved forward in the direction of arrow a against the biasing force of the return spring 11 by transmitting power to the actuating piece 7a from a head base actuating mechanism, which will be described later.
It is designed so that it can be slid in any direction.

Further, bearing brackets 12 are integrally fixed to both sides of the lower part of the mechanical chassis 2, and a cassette holder 13 is pivotally supported on the bearing bracket 12 so as to be rotatable in the lower part with respect to the cassette mounting part 3. A torsion coil spring 14 is fitted into one side of the cassette holder 14, and the cassette holder 13 is always biased forward, that is, in a direction away from the cassette mounting portion 3. This cassette holder 13 is of the so-called kangaroo pocket type, and by inserting the tape cassette A and pushing it backwards, that is, in the direction of the cassette mounting section 3, it is locked against the mechanical chassis 2 in a vertical position and the tape cassette A is inserted into the cassette. By holding the cassette holder 13 at a predetermined mounting position in the mounting section 3 and operating the ejector lever (described later) when ejecting, the cassette holder 13 falls forward by the biasing force of the spring 14, and the tape cassette A is removed from the cassette mounting section 3. It will be done as if you are leaving.

Reference numeral 15 indicates a head base operating mechanism disposed on the back side of the mechanical chassis 2, and this head base operating mechanism 15 is constructed as a part of the tape drive mechanism. Reference numeral 16 denotes a drive gear, which is integrally formed with the capstan 5 and the flywheel 17, and rotational force is transmitted to the flywheel 17 from a drive motor (not shown) via a belt. It is designed to be rotated in the direction of arrow b.

Reference numeral 18 denotes an operating gear as a movable mechanism for the head base 7. A cam 19 is integrally formed on the back side of the operating gear 18, and the cam 19 presses an operating lever, which will be described later, to move the head base 7.
It is designed so that it slides. Further, a toothless portion 20 is formed in a part of the operating base 18, and a bipolar magnet 21 is adhered to a predetermined position on the front side. That is, the magnet 21 has one end half 21a and the other end half 21b magnetized with different polarities in the circumferential direction of the operating gear 18.

Further, a plunger 22 is fixed to the mechanical chassis 2 near the operating gear 18, and an iron core 22a extends from the plunger 22 in the direction of the operating gear 18, and corresponds to the magnet 21 of the operating gear 18. ing.

Furthermore, a substantially triangular actuating arm 23 is pivotally supported on the mechanical chassis 2 in the vicinity of the actuating gear 18, and one side of the actuating arm 23 is attached to the cam 1 of the actuating gear 18 mentioned above.
The operating arm 23 has a pressing edge 23a that is pressed against the arm 9, and a pressing protrusion 23b is formed at the free end of the operating arm 23, and is brought into contact with the operating piece 7a of the head base 7.

A transmission gear 24 is interposed between the actuation gear 18 that operates the actuation arm 23 and the drive gear 16. The transmission gear 24 is pivotally supported at one end 25a of a substantially dogleg-shaped transmission gear lever 25 that is pivotally supported on the mechanical chassis 2 at the same rotation center as the operating gear 18. It has a gear part 24b integrally, and a large diameter gear part 24a.
is meshed with the drive gear 16, and the small diameter gear portion 24b is meshed with the operating gear 18. Further, a coil spring 27 is stretched between the other end 25b of the transmission gear lever 25 and a protruding piece 26 provided on the lower part of the mechanical chassis 2, and the transmission gear 24 is always connected to the drive gear 1 by this spring 27.
It is biased in the direction of meshing with 6.

Furthermore, an ejector lever 28 is disposed at one end of the mechanical chassis 2 so as to be slidable along the side wall 2b of the mechanical chassis 2. By operating the cassette holder 13 in the direction of the arrow c, the above-mentioned lock of the cassette holder 13 is released and the ejecting operation is performed.
Further, by operating the eject lever 28, the transmission gear lever 25 is rotated, so that the transmission gear 24 and the drive gear 16 are disengaged from each other. That is, a pressing piece 29 is protruded from the end of the ejector lever 28, and this pressing piece 29 engages a locking piece 30a formed on the lower edge of the other end 25b of the transmission gear lever 25 at a required interval. When the eject lever 28 is operated in the direction of arrow c, this pressing piece 29 engages the locking piece 30 of the transmission gear lever 25.
By pressing a, the transmission gear lever 25 is rotated against the biasing force of the spring 27, and the transmission gear 24 is disengaged from the drive gear 16.

Further, in the release mechanism of the transmission gear 24, a stop lever 31 is added in this example in particular in order to reduce the operating force of the eject lever 28. That is, as will be described later, the transmission gear 2
4 meshes with both the driving gear 16 and the operating gear 18, and when the driving gear 16 rotates the operating gear 18 via the transmission gear 24, the transmission gear 24 has a bias against the driving gear 16 and the operating gear 18. A force in the retraction direction and a force in the retraction direction act, and therefore the transmission gear 24
Because the transmission gear lever 25 easily comes off from the drive gear 16, it is necessary to use a spring 27 with a very strong tensile force to hold the transmission gear lever 25. In this case, the transmission gear lever 25 is pressed by the ejector lever 28 to rotate it. When moving the eject lever 28, the operating force of the eject lever 28 becomes considerably heavy. Therefore, by adding the stop lever 31 as a member to hold the transmission gear lever 25 when the ejector lever 28 is not operated, the spring 27 has a relatively weak tensile force, and the operating force of the ejector lever 28 can be reduced. It is set as.

This stop lever 31 has a substantially T-shape and is pivotally supported by the mechanical chassis 2 at its center, and a support piece 31a protruding from the center is formed on the upper edge of the other end 25b of the transmission gear lever 25. It corresponds to the locking piece 30b. Further, one end portion 31b of this stop lever 31 is inserted into and engaged with an engagement hole 32 formed in the eject lever 28.
Further, a coil spring 34 is stretched between the other end 31c and the end of the bracket 33 fixed to the mechanical chassis 2, and this spring 34 keeps the stop lever 31 always in the support piece 31a.
is rotated and biased so as to contact the locking piece 30b orthogonally to the rotational direction of the transmission gear lever 25, whereby the transmission gear lever 25 is held in a state in which the transmission gear 24 is meshed with the drive gear 16. It is done as follows.

Next, the operation of the cassette tape recorder of this example constructed as described above will be explained.

Now, when the tape drive mechanism is in the stopped state, the head base 7 is moved by the return spring 11.
In other words, the magnetic head 8 is in a position away from the tape cassette A. Therefore, the cassette holder 13 can be opened by operating the ejector lever to freely insert and remove the tape cassette A. can.

Also, in this state, the head base operating mechanism 15
The one end half 21a of the magnet 21 of the operating gear 18 corresponds to the iron core 22a of the plunger 22,
In this rotational position of the operating gear 18, the toothless portion 2
0 corresponds to the transmission gear 24, so the transmission gear 24 and the operating gear 18 are in a non-meshing state, and therefore the drive gear 16 and the head base 7 are in a non-connected state (see FIG. 1). Note that this operating gear 18 is
A predetermined biasing mechanism always rotationally biases the toothless portion 20 so that it corresponds to the transmission gear 24.

Then, from this state, when the tape cassette A is installed and locked in the cassette holder 13 and the play button is operated, the drive motor is operated and the drive gear 16
rotates in the direction of arrow b, and along with this, transmission gear 2
4 rotates in the direction of arrow d, and the plunger 2
2 is energized and the iron core 22a is excited to have the same polarity as the one end half 21a of the magnet 21. Therefore, the one end half 2 of the magnet 21 is energized with respect to the iron core 22a.
1a is repelled and the other end half 21b is attracted, so that the operating gear 18 rotates in the direction of arrow e and meshes with the transmission gear 24. For this reason, the drive gear 16
The rotation of the cam 19 is transmitted to the operating gear 18 via the transmission gear 24, and the rotation of the operating gear 18 causes the cam 19 to press against the pressing edge 23a of the operating arm 23.
Press. As a result, the actuating arm 23 is rotated in the direction of arrow f, and the pressing protrusion 23 presses the actuating piece 7a of the head base 7 (see FIG. 2).
The magnetic head 8 is inserted into the tape cassette A by sliding in the direction of the arrow a against the biasing force of the tape cassette A.

By this operation, when the head base 7 is slid to its sliding end and the magnetic head 8 is completely inserted into the tape cassette A, the head base 7 is locked by a plunger mechanism provided separately. It is held in a levered state and the operating gear 1
8 is rotated once and the toothless portion 20 is connected to the transmission gear 24 again.
In response to this, the connection between the drive gear 16 and the head base 7 is released.

When the ejecting operation is performed by operating the ejector lever 28 during the sliding operation of the head base 7, that is, the moving operation of the magnetic head 8, the cassette holder 13 is unlocked and at the same time, As the eject lever 28 slides, one end 31b of the stop lever 31 is pressed by the edge of the engagement hole 32 of the eject lever 28, so that the stop lever 31 resists the biasing force of the spring 34. The supporting piece 31a is removed from the locking piece 30b of the transmission gear lever 25, and then the pressing piece 2 of the eject lever 28 is rotated.
9 comes into contact with the locking piece 30a of the other end 25b of the transmission gear lever 25 and presses it, whereby the transmission gear lever 25 is rotated against the biasing force of the spring 27, so that the transmission gear 24 moves in a direction away from drive gear 16, i.e. drive gear 1
6 (see Figure 3).

By disengaging the transmission gear 24 from the drive gear 16 in this way, the transmission of power from the drive gear 16 to the head base 7 is canceled.
The head base 7 is moved back by the biasing force of the return spring 11, and the magnetic head 8 is removed from the tape cassette A. Therefore, even if the cassette holder 13 is opened by operating the ejector lever 28, the magnetic head 8 is located outside the tape cassette A, so the ejecting operation is performed smoothly and the tape cassette A is opened without any support. It can be taken out.

Furthermore, if the power is turned off and the drive gear stops during the moving operation of the magnetic head 8 described above, the magnetic head 8 will be stopped at that position, but in this case as well, the ejector lever 28 is Operate transmission gear 24 to drive gear 1
By removing the drive gear 16 from the head base 7, the connection between the drive gear 16 and the head base 7 is released.
is retracted by the biasing force of the return spring 11, that is, the magnetic head 8 is removed from the tape cassette A, so that the ejecting operation can be performed without any support.

In this way, in this example, the eject lever 2
In conjunction with the operation of step 8, the transmission gear 2 is moved from the drive gear 16 to the transmission gear 2.
4, the magnetic head 8 can be removed from the tape cassette A even if the power is cut off during the movement of the magnetic head 8 or during the movement of the magnetic head 8. Therefore, the tape cassette A can be reliably ejected no matter what state the cassette tape recorder is in. Since this eject mechanism can be implemented with a simpler structure than conventional cassette tape recorders having this type of mechanism, the number of parts is reduced and the number of assembly steps can be reduced, so that it can be provided at a low cost.

Furthermore, in this example, by adding the stop lever 31 as a member that holds the transmission gear lever 25 when the eject lever 28 is not operated, the tension force of the spring 27 of the transmission gear lever 25 can be set to be relatively weak. Eject lever 2 for rotating the transmission gear lever 25
8 requires only a light operating force, which also has the effect of improving operability in the ejecting operation.

[Effect of idea]

As described above, the eject mechanism in the cassette tape recorder of the present invention allows the magnetic head to be ejected from the tape cassette by removing the transmission gear from the drive gear by operating the eject lever. The tape cassette can be taken out even under such conditions, and since this eject mechanism can be implemented with a simpler configuration than conventional mechanisms of this type, it is inexpensive because it has fewer parts and reduces assembly man-hours. It is also highly effective in terms of productivity, as it can be provided to

[Brief explanation of drawings]

Fig. 1 is a plan view of the eject mechanism in the cassette tape recorder of the present invention, Figs. 2 and 3 are plan views showing its operating state, and Fig. 4 is a partially cutaway view of the cassette tape recorder to which the present invention is applied. The front view shown in FIG. 5 is a perspective view of the main parts thereof. In the figure, 7 is the head base, 8 is the magnetic head, 1
1 is a return spring as a biasing member, 16
18 is a driving gear, 23 is an operating arm, 24 is a transmission gear, 25 is a transmission gear lever, 2
8 is an ejector lever, and A is a tape cassette.

Claims (1)

[Scope of Claim for Utility Model Registration] In a cassette tape recorder in which a magnetic head is moved by the power of a motor and inserted into a tape cassette, the magnetic head is attached and is always held against the tape cassette by a biasing member. a head base biased in a backward direction; a drive gear driven by the motor; power of the drive gear is transmitted to a movable mechanism of the head base; the magnetic head is inserted into the tape cassette; and an eject lever that removes the transmission gear from the drive gear, and the head base is moved backward by removing the transmission gear from the drive gear by operating the eject lever. 1. An eject mechanism for a cassette tape recorder, characterized in that the magnetic head is ejected from the tape cassette by using the eject mechanism.