JP2756895B2 - Cassette loading device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cassette loading device mounted on a magnetic recording / reproducing device, and more particularly to a cassette loading device called a front loading system.

[0002]

2. Description of the Related Art A conventional cassette loading apparatus is shown in FIGS.
It will be described based on. First, the structure will be described with reference to FIGS. 6A is a plan view of the cassette holder A, FIG. 6B is a front view thereof, FIG. 6C is a left side view thereof,
7D is a right side view, FIG. 7 is a plan view showing a state where the cassette holder A is assembled to the frame portion B, and FIG. 8 is a side view thereof.

First, the cassette holder A will be described. The slider 1 on which the cassette m is mounted has slider side plates 2 and 2 integrally and substantially vertically raised from both left and right ends thereof. Stopper pieces 1 for receiving the front end portion of the cassette m to be inserted on the left and right sides on the rear side of the slider 1.
a and 1b are integrally started. The first to third slider shafts 2a, 2
The b and 2c are caulked in an outwardly protruding state. The first to third slider shafts 2a, 2b, 2c are also symmetrically crimped to the left slider side plate 2. A bracket 2 is provided on the upper edge of each of the slider side plates 2 and 2 toward the inside.
A and 2A are integrally bent, and cassette pressing leaf springs 3 and 3 for elastically pressing the cassette m against the slider 1 are crimped to the brackets 2A and 2A. Left and right slider locks 4, 4 formed in a substantially L-shape are swingably mounted around the second slider shafts 2 b, 2 b in a state of sliding contact with the outer surfaces of the slider side plates 2, 2. Each slider lock 4, 4
A bottom plate portion 4 having projections 4a, 4a at the center of the upper edge, and having a lower portion surrounding the lower side of the slider side plates 2, 2 inward.
b, 4b are integrally formed by bending, and each bottom plate portion 4b,
The rising pieces 4c, 4c are integrally formed at the end of 4b. Slider lock springs 5, 5 are stretched between the slider side plates 2, 2 and the slider locks 4, 4, and the slider locks 4, 4 are pulled and urged so that the convex portions 4a, 4a thereof face upward. I have. In such a free state, the rising pieces 4c, 4c of the slider locks 4, 4 are located slightly forward of the stopper pieces 1a, 1b of the slider 1. An unlock lever 6 for unlocking the closed state of the front lid m ₁ (see FIG. 8) of the cassette m is provided on the right slider side plate 2 so as to be swingable about the longitudinal axis (FIG. 6).
(D)).

Next, the frame section B will be described with reference to FIGS. A pair of left and right frames 8, 8 are erected near the left and right ends of the mechanical chassis 7 in parallel with each other. Flanges 8A, 8A are integrally formed on the upper edges of the frames 8, 8 inwardly. Top plates 9 and 10 are stretched between the front and rear ends of the upper edge of each frame 8 and 8, respectively. A cassette cover 11 for opening and closing the front end portions of the opposing gaps between the left and right frames 8, 8 is rotatably supported by holes in upper front corners of both frames 8, 8, and is closed by a cover closing spring (not shown). Biased in the direction. A down guide 12, which supports the bottom of the cassette m to be inserted and guides the lowering of the cassette m toward the cassette loading position, spans between the upper and lower intermediate positions of the front ends of the frames 8, 8 on the near side. Have been. Open lever 13 for opening the cassette front lid m ₁ on the right side of the lower surface position of the top plate 10 of the rear side
Is attached.

[0005] The first slider shafts 2a of the cassette holder A are inserted into and guided by the frames 8,8.
The first guide holes 8a, 8a having a letter shape and the second guide holes 8b, 8b having an L shape for inserting and guiding the second slider shafts 2b, 2b are formed. That is, the cassette holder A has L-shaped guide holes 8a, 8a and 8b,
8b so as to be movable. Guide holes 8c, 8c with ribs for engaging and guiding the third slider shafts 2c, 2c when the cassette holder A is lowered are cut and raised in the frames 8, 8 inward. In the lower portion of the inner surface of the right frame 8, the drive rail 14
Are slidably mounted in the front-rear direction. The drive rail 14 is formed with a horizontally elongated hole 14a for allowing the drive rail 14 to slide back and forth through a main shaft 15 to be described later, and receives a driving force for sliding. A passive rack gear 14b and a drive rack gear 1 for driving a right drive arm 16 described later.
4c are formed. Note that such a drive rail 14 is provided only on the right side.

A main shaft 15 is hung over the lower ends of the frames 8, 8 and is rotatably supported by the shaft. The base end portion of the right drive arm 16 is fixed to the main shaft 15 inside the right frame 8 and immediately inside the drive rail 14. The base end portion of the left drive arm 16 is fixed to the main shaft 15 immediately near the inside of the left frame 8. Left and right drive arms 16, 1 with respect to main shaft 15
6 have the same mounting phase and are parallel to each other, so that both drive arms 16 and 16 rotate integrally in synchronization. Immediately outside the right drive arm 16, a gear 17 that meshes with the drive rack gear 14 c is fixed to the main shaft 15.

Slots 16a are formed in the drive arms 16 along the longitudinal direction thereof, and a first slider shaft inserted into the first guide holes 8a of the frames 8, 8 is provided. 2a, 2a are elongated holes 16a, 16a
It is also inserted. And both drive arms 16,
To 16, cassette pressure springs 18, 18 formed of leaf springs for pressing the first slider shafts 2 a, 2 a in a counterclockwise direction are attached.

A lower end portion of a lid open arm 19 for opening the cassette cover 11 is rotatably supported at a lower portion of the left frame 8. This lid open arm 1
The upper end of 9 is in a state capable of contacting the cassette cover 11, and the lower end is in a state of being able to contact a cam (not shown) provided on the left drive arm 16. In addition,
Such a lid open arm 19 is provided only on the left side.

The passive rack gear 1 on the drive rail 14
Reference numeral 4b meshes with a pinion gear 21 rotatably supported by a bottom plate portion 8B of the right frame 8 via a shaft 20.

A double-acting mechanism (not shown) is interposed between the worm wheel 22 provided coaxially with the shaft 20 and the pinion gear 21. Bottom plate 8B of right frame 8
A worm 23 is rotatably supported in a rotatable manner so as to mesh with the worm wheel 22, and the worm 23 is linked to a drive motor (not shown). A switch lever 24 is pivotally supported via a shaft 25 on the bottom plate 8B of the right frame 8. One end of the switch lever 24 is in a state capable of contacting a cam (not shown) in the drive rail 14, and the other end is in a state capable of contacting a switch 26 mounted on the right frame 8. A cassette stay 2 for placing and supporting the bottom of the loaded cassette m is mounted on the mechanical chassis 7.
7 are planted in four places in front, back, left and right.

Next, the operation will be described with reference to FIGS. First, as shown in FIG. 8, the cassette m is inserted along the down guide 12, placed on the slider 1 of the cassette holder A, and further inserted all the way. The rear end of the cassette m has raised pieces 4c, 4 of the slider locks 4, 4.
c (see FIG. 6), the slider locks 4 and 4 swing clockwise against the slider lock springs 5 and 5, and the cassette m slides inward and the stopper piece 1a of the slider 1 is moved. , 1b (see FIG. 6), and the sliding on the slider 1 is stopped. Further, the cassette m is pressed against the slider 1 from above by the left and right cassette pressing leaf springs 3,3. As a result, the cassette m is stably held by the cassette holder A. When the slider locks 4 and 4 are swung clockwise, the protrusions 4
a, 4a come out of engagement with the holes in the flanges 8A, 8A of both frames 8, 8, and the cassette holder A
Is released. At the start of the insertion of the cassette m, the front end portion of the cassette m opens and rotates the cassette cover 11 against a cover closing spring (not shown). In this state, the upper end of the lid open arm 19 is
Away from

When the cassette m is further pushed in, the state shown in FIG. 9 is obtained. That is, the cassette holder A moves a little deeper inside the frame portion B. At this time, the first slider shafts 2a, 2a of the cassette holder A are guided by the first guide holes 8a, 8a of the left and right frames 8, 8, and the second slider shafts 2b are guided by the second guide holes 8b, 8b. , 2b
Will be guided. When the first slider shafts 2a, 2a are moved to the rear side, the left and right drive arms 16, 16 which pass the first slider shafts 2a, 2a through the elongated holes 16a, 16a are synchronized with the main shaft. 15 rotates counterclockwise around the axis. Then, the main shaft 1
5 rotates counterclockwise, and the gear 17 also rotates in the same direction. The drive rack gear 14c of the drive rail 14 is a gear 17
, The drive rail 14 slides slightly to the rear side with the rotation of the gear 17.

At this time, the drive rail 14 slides while extending a double-acting mechanism (not shown) inserted between the pinion gear 21 and the worm wheel 22.

When the drive rail 14 slides slightly to the rear,
A cam (not shown) provided on the drive rail 14 causes the switch lever 24 to swing about an axis 25 to switch the switch 2.
6 is inverted from the OFF state to the ON state. As a result, a motor (not shown) is driven. The driving torque of the motor is transmitted to the worm 23 and the worm 23
To the worm wheel 22, and further transmitted to the pinion gear 21 via a double-acting mechanism (not shown), from the pinion gear 21 to the passive rack gear 1 of the drive rail 14.
4b is transmitted as a sliding driving force toward the back side.

When the drive rail 14 is forcibly moved toward the back side by the sliding drive force, the gear 17 meshing with the drive rack gear 14c of the drive rail 14 is rotated counterclockwise, and The left and right drive arms 16, 16 are rotated counterclockwise synchronously via the shaft 15. Then, the first slider shafts 2a, 2a inserted into the long holes 16a, 16a of the drive arms 16, 16 are forcibly moved to the rear side, and accordingly, the cassette holder A is moved to the rear side together with the cassette m. Be moved. At this time, in the cassette holder A, the first slider shafts 2a, 2a are guided by the L-shaped first guide holes 8a, 8a, and the second slider shafts 2b, 2b are moved by the L-shaped second guide holes. It is guided to the holes 8b, 8b. Drive rail 1
In No. 4, since the elongated hole 14a relatively slides on the main shaft 15, there is no problem in sliding the drive rail 14.

In this manner, when the cassette holder A is moved to the rear side to be in the state shown in FIG. 10, the third slider shafts 2c, 2c are engaged with the guide holes 8c, 8c with ribs. The first slider shafts 2a, 2a reach the bent portions of the first guide holes 8a, 8a, and the second slider shafts 2b, 2b reach the bent portions of the second guide holes 8b, 8b. Further, when proceeding to this position, the lock release lever 6 (see FIG. 6) of the cassette holder A is pressed by a cam (not shown) provided on the right frame 8 and swings inward, so that the front cover m _{1 of the} cassette m. Release the locked state of. Then, the protrusions 4a of the slider locks 4, 4
The slider locks 4 and 4 are further slid clockwise against the slider lock springs 5 and 5 so that the slider locks 4a come into sliding contact with the slightly lowered steps of the flanges 8A and 8A of the frames 8 and 8, respectively. parts 4b, 4b is to open a little cassette front lid m ₁ pushes up the cassette front lid m _1. Further, a cam (not shown) provided on the left drive arm 16 rotates the lid open arm 19 counterclockwise in synchronization with the drive arm 16 to bring the upper end of the lid open arm 19 into contact with the cassette cover 11. Therefore, the lid open arm 19 holds the cassette cover 11 in the open position instead of the cassette m.

A motor (not shown) is continuously driven,
The state changes from the state of FIG. 10 to the state of FIG. That is, as the drive rail 14 is further moved to the rear side, the drive arms 16, 16 are further rotated counterclockwise, and the drive arms 16, 16 move the first slider shafts 2a, 2a to the first slider shafts 2a, 2a. The first guide holes 8a are pressed and moved downward along the vertical portions of the guide holes 8a. Accordingly, the second slider shafts 2b, 2b are also
Since the third slider shafts 2c, 2c are also moved downward along the ribbed guide holes 8c, 8c, the cassette holder A moves downward along with the cassette m. Will be moved. Then, the lid open arm 19 is moved to the left drive arm 16.
Is separated from a cam (not shown), and the urging force of a lid closing spring (not shown) is developed to
To the closed position and the lid open arm 19.
To the home position. Also, the cassette front lid m ₁
Since it comes into contact with the open lever 13 while descending, it is opened by the open lever 13.

The cassette m in the cassette holder A is mounted and supported on four cassette stays 27 in the mechanical chassis 7, and the cassette pressure spring 1 provided on the drive arms 16, 16 which is to be rotated in the counterclockwise direction.
Since the first and second sliders 8 and 18 forcibly press the first slider shafts 2a and 2a downward, the cassette m is pressed against the four cassette stays 27 with the cassette m slightly raised from the slider 1. Then, just at that timing, the cam (not shown) of the drive rail 14 that has pressed the switch lever 24 until then separates from the switch lever 24, so that the switch 26 is inverted from the ON state to the OFF state, and the drive motor is stopped. You.

Thus, the loading operation of the cassette m is completed. The ejection operation of the cassette m is performed in the reverse process.

[0020]

In the above-described conventional cassette loading apparatus, the cassette m is set in the cassette stay 2.
In the loaded state of the cassette crimped on the cassette 7, the cassette crimping springs 18, 18 are connected to the first slider shafts 2 a, 2.
Since the drive arm 16 is pressed, a reaction force is exerted on the drive arms 16 to return clockwise and rotate.
If the drive arms 16 and 16 are allowed to return and rotate, there is no problem because the pressing force against the cassette m is lost. Therefore, in this conventional example, a reverse rotation prevention mechanism including a worm wheel 22 and a worm 23 is employed in order to restrict the return rotation of the drive arms 16 and 16 when the cassette m is crimped. .

That is, in this reverse rotation preventing mechanism, the return sliding of the drive rail 14 is restricted, and the return rotation of the gear 17 which is constantly meshed with the drive rack gear 14c of the drive rail 14 and thus the main shaft 15 is restricted. So,
The return rotation of the drive arms 16, 16 by the cassette crimping springs 18, 18 is regulated.

However, the worm wheel 2 as described above
In the case where the reverse rotation preventing mechanism including the worm 23 and the worm 23 is used, when the insertion of the cassette m shown in FIG.
In order to allow the initial movement of the drive rail 14 to the rear side by a slight rotation of the drive arms 16 and 16 due to a manual operation required to switch the drive rail to the ON state, the distance between the worm wheel 22 and the pinion gear 21 is required. A double-acting mechanism must be provided. And, in combination with the reverse rotation prevention mechanism including the worm wheel 22 and the worm 23, and the structure in which the drive rack gear 14c and the gear 17 are meshed, as a whole,
The number of parts is increased, the structure is complicated, and there is a problem that it is an obstacle to miniaturization of the device and increases the cost.

The present invention has been made in view of such circumstances, and even if a reverse rotation preventing mechanism or a double-acting mechanism having a complicated structure is omitted, the return rotation of the drive arm in a state in which the cassette is crimped. It is an object of the present invention to restrict the movement and still allow an artificial initial movement of the drive rail at the start of cassette insertion.

[0024]

SUMMARY OF THE INVENTION A cassette loading device according to the present invention has a cassette holder having a slider for mounting a cassette, and supports the cassette holder and guides it slidably along an L-shaped path. A frame, a drive rail slidably attached to the frame in the front-rear direction, the sliding of which is driven by a motor;
In the cassette loading device provided with a drive arm which is rotated in conjunction with the sliding of the drive rail to slide the cassette holder and crimp downward, the drive rail and the drive arm are linked. Mechanism
Combination of an L-shaped guide portion provided on the drive rail with an upper end portion having a vertical direction and a lower end portion having a horizontal direction, and a passive portion provided on the drive arm in a state of being engaged with the L-shaped guide portion. It is characterized by comprising.

[0025]

When the cassette is inserted into the cassette holder and further pushed in a little, the drive arm is rotated artificially and the passive portion presses the vertical portion of the L-shaped guide, so that the L-shaped guide is provided. The driven rail slides a little deeper in the initial stage, and drives the motor by turning on the switch. The driving torque of the motor is given to the driving rail,
Since the L-shaped guide portion of the drive rail presses the passive portion of the drive arm, the drive arm is rotated, whereby the cassette holder is forcibly slid backward and then lowered. Then, when the rotating drive arm presses the cassette on the cassette holder, the passive portion of the drive arm is located at a lateral portion of the L-shaped guide portion on the drive rail. When the cassette is crimped, a return reaction force acts on the drive arm while returning to the drive arm. However, since the passive portion of the drive arm is located in the lateral portion of the L-shaped guide portion, the reaction force is reduced by an L-shaped portion of the drive rail. The drive arm will be received by the lateral portion of the guide and will restrict the return rotation of the drive arm. Therefore, the return sliding force in the front-rear direction does not act on the drive rail.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a cassette loading device in a magnetic recording / reproducing apparatus according to the present invention will be described below in detail with reference to the drawings.

The structure of the cassette loading device of this embodiment will be described with reference to FIGS. 1, 2 and 6. FIG. 1 is a plan view showing a state where a cassette holder A is assembled to a frame portion B, and FIG. 2 is a side view thereof. 6A and 6B are drawings common to the present embodiment and the conventional example. FIG. 6A is a plan view of the cassette holder A, FIG. 6B is a front view thereof, FIG. 6C is a left side view thereof, and FIG. ) Is a right side view thereof.

First, referring to FIG.
Will be described. As in the conventional example, the slider 1 on which the cassette m is mounted has slider side plates 2 and 2 integrally and substantially vertically raised from both left and right ends thereof. Stopper pieces 1a and 1b for receiving the front end portion of the cassette m inserted therein are integrally raised on the left and right sides on the rear side of the slider 1. First to third slider shafts 2a, 2b, 2c are crimped to the right slider side plate 2 so as to protrude outward. Also on the left slider side plate 2,
Symmetrically, the first to third slider shafts 2a, 2b, 2c
Is crimped. Brackets 2A, 2A are integrally formed on the upper edges of the slider side plates 2, 2 inwardly, and cassettes m are attached to the brackets 2A, 2A.
The cassette pressing leaf springs 3 for elastically pressing the slider 1 against the slider 1 are caulked. Left and right slider locks 4, 4 formed in a substantially L-shape are swingably mounted around the second slider shafts 2 b, 2 b in a state of sliding contact with the outer surfaces of the slider side plates 2, 2. Each of the slider locks 4 and 4 has a convex
a, 4a and a slider side plate 2,
Bottom plate portions 4b, 4b that go inward below 2 are integrally bent and formed, and rising pieces 4c, 4c are integrally formed at the ends of the bottom plate portions 4b, 4b. Slider lock springs 5, 5 are stretched between the slider side plates 2, 2 and the slider locks 4, 4, and the slider locks 4, 4 are pulled and urged so that the convex portions 4a, 4a thereof face upward. I have. In the free state urged as described above, the rising pieces 4 of the slider locks 4 and 4 are provided.
The sliders c and 4c are located slightly closer to the slider 1 than the stopper pieces 1a and 1b. Right the slider side plate 2 is swingably provided to the lock release lever 6 is a vertical-axis to unlock the closed state before the lid m ₁ of the cassette m.

Next, the frame section B will be described with reference to FIGS. A pair of left and right frames 8, 8 are erected near the left and right ends of the mechanical chassis 7 in parallel with each other. Flanges 8A, 8A are integrally formed on the upper edges of the frames 8, 8 inwardly. Top plates 9 and 10 are stretched between the front and rear ends of the upper edge of each frame 8 and 8, respectively. A cassette cover 11 for opening and closing the front end portions of the opposing gaps between the left and right frames 8, 8 is rotatably supported by holes in upper front corners of both frames 8, 8, and is closed by a cover closing spring (not shown). Biased in the direction. A down guide 12, which supports the bottom of the cassette m to be inserted and guides the lowering of the cassette m toward the cassette loading position, spans between the upper and lower intermediate positions of the front ends of the frames 8, 8 on the near side. Have been. Open lever 13 for opening the cassette front lid m ₁ on the right side of the lower surface position of the top plate 10 of the rear side
Is attached.

The first slider shafts 2a, 2a of the cassette holder A are inserted into and guided by the frames 8, 8, respectively.
The first guide holes 8a, 8a having a letter shape and the second guide holes 8b, 8b having an L shape for inserting and guiding the second slider shafts 2b, 2b are formed. That is, the cassette holder A has L-shaped guide holes 8a, 8a and 8b,
8b so as to be movable. Guide holes 8c, 8c with ribs for engaging and guiding the third slider shafts 2c, 2c when the cassette holder A is lowered are cut and raised in the frames 8, 8 inward. In the lower portion of the inner surface of the right frame 8, the drive rail 14
Are slidably mounted in the front-rear direction. The drive rail 14 is formed with a horizontally elongated hole 14a for allowing the drive rail 14 to slide back and forth through a main shaft 15 to be described later, and receives a driving force for sliding. A passive rack gear 14b is formed.
However, the driving rack gear 14c formed in the conventional example is not provided. Instead, drive rail 14
An L-shaped guide portion 14d having an upper end portion in a vertical direction and a lower end portion in a horizontal direction is formed at a position on the near side of the long hole 14a. The horizontal portion of the L-shaped guide portion 14d is located on the near side with respect to the vertical portion. In the case of this embodiment, the L-shaped guide portion 14d
It is formed as a substantially quarter arc-shaped long hole. The L-shaped guide portion 14d of the drive rail 14 is for driving a right drive arm 16 described later.

The driving rail 14 is provided only on the right side.

A main shaft 15 is hung over the lower ends of the frames 8, 8 and is rotatably supported by the shaft. The base end portion of the right drive arm 16 is fixed to the main shaft 15 inside the right frame 8 and immediately inside the drive rail 14. The base end portion of the left drive arm 16 is fixed to the main shaft 15 immediately near the inside of the left frame 8. Left and right drive arms 16, 1 with respect to main shaft 15
6 have the same mounting phase and are parallel to each other, so that both drive arms 16 and 16 rotate integrally in synchronization. On the side surface of the drive arm 16 on the right side, a passive portion 16b that is slidably guided by engaging with the L-shaped guide portion 14d of the drive rail 14 is integrally projected. The gear 17 fixed to the main shaft 15 in the conventional example is not provided. The L-shaped guide portion 14d of the drive rail 14 and the passive portion 16b of the right drive arm 16 engaging with the L-shaped guide portion 14d constitute a mechanism for interlocking the drive rail 14 and the drive arm 16.

Slots 16a, 16a are formed in the drive arms 16, 16 along the longitudinal direction thereof, and the first slider shaft inserted into the first guide holes 8a, 8a of the frames 8, 8 is formed. 2a, 2a are elongated holes 16a, 16a
It is also inserted. And both drive arms 16,
To 16, cassette pressure springs 18, 18 formed of leaf springs for pressing the first slider shafts 2 a, 2 a in a counterclockwise direction are attached.

At the lower part of the left frame 8, a portion near the lower end of a lid open arm 19 for opening the cassette cover 11 is rotatably supported. This lid open arm 1
The upper end of 9 is in a state capable of contacting the cassette cover 11, and the lower end is in a state of being able to contact a cam (not shown) provided on the left drive arm 16. In addition,
Such a lid open arm 19 is provided only on the left side.

Passive rack gear 1 on drive rail 14
Reference numeral 4b meshes with a pinion gear 21 rotatably supported by a bottom plate portion 8B of the right frame 8 via a shaft 20.

The drive motor (not shown) is a pinion gear 2
It is linked to 1. However, the worm wheel 22 as a reverse rotation prevention mechanism provided in the conventional example
And the worm 23 and the double-acting mechanism interposed between the worm wheel 22 and the worm 23 are not provided.

A switch lever 24 is pivotally supported by a bottom plate 8 B of the right frame 8 via a shaft 25. One end of the switch lever 24 is connected to the drive rail 14.
And the other end can be in contact with the switch 26 attached to the right frame 8. Cassette stays 27 for placing and supporting the bottom of the loaded cassette m are planted in the mechanical chassis 7 at four positions in front, rear, left and right.

Next, the operation of the cassette loading device configured as described above will be described with reference to FIGS. First, as shown in FIG. 2, the cassette m is inserted along the down guide 12, is placed on the slider 1 of the cassette holder A, and is inserted further. The rear end of the cassette m has raised pieces 4c, 4c of the slider locks 4, 4 (see FIG. 6).
, The slider locks 4, 4 swing clockwise against the slider lock springs 5, 5. Further, the cassette m slides to the rear side to stop the stopper piece 1 on the slider 1.
a, 1b (see FIG. 6), and the sliding on the slider 1 is stopped.

The cassette m is pressed against the slider 1 from above by the left and right cassette pressing leaf springs 3,3. As a result, the cassette m is stably held by the cassette holder A. Slider lock 4, 4
Is swung clockwise, the protrusions 4a, 4a come out of engagement with the holes in the flanges 8A, 8A of both frames 8, 8, and the locked state of the cassette holder A is released. At the start of the insertion of the cassette m, the cassette m
The front end portion of the cassette opens and rotates the cassette cover 11 against a cover closing spring (not shown). In this state, the upper end of the cover open arm 19 is separated from the cassette cover 11.

When the cassette m is further pushed in, the state shown in FIG. 3 is obtained. That is, the cassette holder A moves a little deeper inside the frame portion B. At this time, the first slider shafts 2a, 2a of the cassette holder A are guided by the first guide holes 8a, 8a of the left and right frames 8, 8, and the second slider shafts 2b are guided by the second guide holes 8b, 8b. , 2b
Will be guided. When the first slider shafts 2a, 2a are moved to the rear side, the left and right drive arms 16, 16 which pass the first slider shafts 2a, 2a through the elongated holes 16a, 16a are synchronized with the main shaft. It is artificially rotated around the axis 15 in a counterclockwise direction. As the right drive arm 16 rotates counterclockwise, the passive portion 16b of the right drive arm 16
4 is pressed toward the rear side in the vertical direction of the L-shaped guide portion 14d. As a result, the drive rail 14 slides slightly backward. At this time, the output shaft of the drive motor (not shown) is rotated via the pinion gear 21. However, at this stage, power has not been supplied to the motor yet. That is, the initial sliding of the drive rail 14 is allowed by idling of the motor.

When the drive rail 14 slides slightly to the rear,
A cam (not shown) provided on the drive rail 14 causes the switch lever 24 to swing about an axis 25 to switch the switch 2.
6 is inverted from the OFF state to the ON state. As a result, a drive motor (not shown) is driven.
The driving torque of the motor is transmitted to the pinion gear 21, and the pinion gear 21 transfers the passive rack gear 1 of the drive rail 14.
4b is transmitted as a sliding driving force toward the back side.

When the drive rail 14 is forcibly moved toward the rear by the sliding driving force, the vertical portion of the L-shaped guide portion 14d provided on the drive rail 14 is The portion 16b is pressed and moved toward the back side. As a result, the right drive arm 1
6 is rotated counterclockwise, and the left drive arm 16 integrated with the right drive arm 16 via the main shaft 15 is synchronously rotated in the same direction. . Then, the drive arms 16, 1
The first slider shafts 2a, 2a inserted into the long holes 16a, 16a are forcibly moved to the back side, and accordingly, the cassette holder A is moved to the back side together with the cassette m. At this time, the cassette holder A has the first slider shafts 2a, 2a having the L-shaped first guide holes 8a, 8a.
, And the second slider shafts 2b, 2b are guided by the L-shaped second guide holes 8b, 8b. The drive rail 14 does not hinder the slide of the drive rail 14 because the elongated hole 14a relatively slides on the main shaft 15.

In this way, when the cassette holder A is moved to the rear side to reach the state shown in FIG. 4, the third slider shafts 2c, 2c are engaged with the guide holes 8c, 8c with ribs. The first slider shafts 2a, 2a reach the bent portions of the first guide holes 8a, 8a, and the second slider shafts 2b, 2b reach the bent portions of the second guide holes 8b, 8b. Also, when proceeding to this position, the cassette holder A
Unlocking lever 6 (see FIG. 6) is swung inwardly is pressed by a cam (not shown) provided on the right side of the frame 8, to release the locked state of the front lid m ₁ of the cassette m in. Then, the convex portions 4a, 4 of the slider locks 4, 4
a comes into sliding contact with the stepped portions of the flanges 8A, 8A of the frames 8, 8, which are slightly lowered.
4 is further swung clockwise against the slider lock springs 5, 5, and the bottom plates 4b, 4b are
₁ will be open a little cassette front lid m ₁ pushed up. A cam (not shown) provided on the left drive arm 16 connects the cover open arm 19 to the drive arm 1.
6, the upper end of the lid open arm 19 is brought into contact with the cassette cover 11 so that the cover open arm 19 holds the cassette cover 11 in the open position instead of the cassette m. Will do.

A motor (not shown) is continuously driven,
The state of FIG. 4 shifts to the state of FIG. That is, as the drive rail 14 is further moved to the rear side, the drive arms 16, 16 are further rotated counterclockwise, and the drive arms 16, 16 move the first slider shafts 2a, 2a to the first slider shafts 2a, 2a. The first guide holes 8a are pressed and moved downward along the vertical portions of the guide holes 8a. Along with this,
The second slider shafts 2b, 2b are also connected to the second guide holes 8b, 8b.
b, the third slider shafts 2c, 2c are also moved downward along the ribbed guide holes 8c, 8c, so that the cassette holder A is moved downward together with the cassette m. Will be. Then, the lid open arm 19 is separated from the cam (not shown) of the drive arm 16 on the left side, and the urging force of the lid closing spring (not shown) is developed to rotate the cassette control lid 11 to the closed position and to open the lid open arm. 19 is returned to the origin position. Further, since the cassette front lid m ₁ comes into contact with the open lever 13 while descending, the cassette front lid m ₁ is opened by the open lever 13. During this time, the passive portion 16b of the right drive arm 16 slides downward and forward in the L-shaped guide portion 14d of the drive rail 14, and in the state of FIG. Part will be located.

The cassette m in the cassette holder A is mounted and supported on four cassette stays 27 in the mechanical chassis 7, and the cassette pressure spring 1 provided on the drive arms 16, 16 which is about to rotate counterclockwise.
Since the first and second sliders 8 and 18 forcibly press the first slider shafts 2a and 2a downward, the cassette m is pressed against the four cassette stays 27 with the cassette m slightly raised from the slider 1. Then, just at that timing, the cam (not shown) of the drive rail 14 that has pressed the switch lever 24 until then separates from the switch lever 24, so that the switch 26 is inverted from the ON state to the OFF state, and the drive motor is stopped. You.

Thus, the operation of loading the cassette m is completed. The ejection operation of the cassette m is performed in the reverse process.

Now, the cassette crimping springs 18, 18
In the cassette loaded state in which the cassette m is pressed on the cassette stay 27, the first slider shafts 2a pressing the cassette pressing springs 18, 18 are moved.
Receive the reaction force of the clockwise return rotation from the cassette crimping springs 18,18. That is, a reaction force of the clockwise return rotation is applied to the drive arms 16 and 16. However, at this time, since the passive portion 16b of the right drive arm 16 is located at the lateral portion of the L-shaped guide portion 14d on the drive rail 14, the return rotation power applied to the drive arms 16, 16 is provided. Is received by the lateral portion of the L-shaped guide portion 14d. Therefore, the drive arm 1
The return rotation of the wheels 6 and 16 is regulated. This is because the drive rail 14 is slidable in the front-rear direction, but is restricted in the vertical direction. Further, since the return rotation power acts upward, the drive rail 14 does not slide back and forth along the front-rear direction, and the return slide of the drive rail 14 is also restricted.

That is, the structure of engagement between the L-shaped guide portion 14d and the passive portion 16b constitutes a reverse rotation preventing mechanism. The structure of the reverse rotation preventing mechanism is much simpler than that of the conventional reverse rotation preventing mechanism including the worm wheel 22 and the worm 23. Further, the double-acting mechanism interposed between the pinion gear 21 and the worm wheel 22 in the conventional example becomes unnecessary. The drive rack gear 14
The structure for meshing the gear c with the gear 17 is not required, and as a whole, the number of parts can be significantly reduced, thereby simplifying the structure, promoting the miniaturization of the device, and reducing the cost.

[0049]

As described above, according to the present invention, the L-shaped guide portion is provided on the drive rail, the passive portion is provided on the drive arm, and the L-shaped guide portion is engaged with the passive portion. ,
The return rotation reaction force acting on the drive arm in the cassette crimping state can be received by the passive portion of the drive arm being located in the lateral portion of the L-shaped guide portion on the drive rail, and the return rotation of the drive arm and, consequently, the return rotation of the drive arm. Since the return sliding of the drive rail along the front-rear direction can be restricted, and the initial movement of the drive rail via the drive arm at the start of cassette insertion can be permitted, the reverse rotation prevention mechanism having a complicated structure can be omitted. It is possible to omit the double-acting mechanism. Therefore, it is possible to simplify the structure, reduce the size, and reduce the cost by reducing the number of parts.

[Brief description of the drawings]

FIG. 1 is a plan view showing the structure of a cassette loading device according to one embodiment of the present invention.

FIG. 2 is a side view showing the structure of the cassette loading device of the embodiment and also serving to explain the operation.

FIG. 3 is a side view for explaining the operation of the cassette loading device of the embodiment.

FIG. 4 is a side view for explaining the operation of the cassette loading device of the embodiment.

FIG. 5 is a side view for explaining the operation of the cassette loading device of the embodiment.

FIG. 6 is a plan view, a front view, a left side view, and a right side view showing the structure of a cassette holder common to the embodiment and the conventional cassette loading apparatus.

FIG. 7 is a plan view showing the structure of a cassette loading device according to a conventional example.

FIG. 8 is a side view showing the structure of a conventional cassette loading device and also providing an explanation of the operation.

FIG. 9 is a side view for explaining the operation of the conventional cassette loading apparatus.

FIG. 10 is a side view for explaining the operation of a conventional cassette loading apparatus.

FIG. 11 is a side view for explaining the operation of a conventional cassette loading apparatus.

[Explanation of symbols]

A: cassette holder, B: frame part, m: cassette, 1: slider, 2a, 2b, 2c: slider shaft, 3: cassette pressing leaf spring, 4: slider lock, 5 ... Slider lock spring, 6 Lock release lever, 7 Mechanical chassis, 8 Frame, 8
a, 8b: L-shaped guide hole, 8c: Guide hole with rib, 11: Cascon cover, 12: Down guide, 1
3 ... Open lever, 14 ... Drive rail, 14a ...
... Long hole, 14b ... Passive rack gear, 14d ... L-shaped guide part, 15 ... Main shaft, 16 ... Drive arm, 16a ... Long hole, 16b ... Passive part, 18 ...
Cassette crimp spring, 19 ... Lid open arm,
21: Pinion gear, 24: Switch lever, 26
... switch, 27 ... cassette stay

Claims (1)

(57) [Claims] 1. A cassette holder (A) having a slider (1) for mounting a cassette (m), an L-shaped path (8) supporting the cassette holder (A) and supporting the cassette holder (A).
a, 8b) and a drive rail (14) that is slidably guided in the front-rear direction and that is slidably mounted on the frame (B) in the front-rear direction. And a drive arm (16) which is rotated in conjunction with the sliding of the drive rail (14) to slide the cassette holder (A) and crimp downward.
The drive rail (14) and the drive arm (16).
An L-shaped guide portion (14d) provided on the drive rail (14) and having an upper end portion in a vertical direction and a lower end portion in a horizontal direction, and an L-shaped guide portion (14d) provided on the drive rail (14).
A cassette loading device comprising a combination with a passive portion (16b) provided on a drive arm (16) in a state of engaging with the drive arm (16).