JPH06131773A - Cassette loader - Google Patents

Abstract

PURPOSE:To regulate a drive arm in backward turn under a cassette pressing state by inserting a slider shaft into a long hole and turning the shaft and engaging the drive arm with an L-shaped guide part. CONSTITUTION:1st and 2nd slider shafts 2a and 2b of a cassette holder A are freely drivably inserted along L-shaped guide holes 8a and 8b of right and left frames 8. Now, a drive rail 14 to be slidably moved by a motor is provided on the frame 8, and the rail 14 is formed with the L-shaped guide part 14d having an upper part in the vertical direction and a lower part in the horizontal direction. Then, the drive arm for sliding the cassette holder A by inserting the slider shaft 2a into the long hole 16a and turning the shaft is provided with a driven part 16b, which is then engaged with the guide part 14d. Consequently, the backward turn reaction force working upon the arm under the cassette pressing state can be received by positioning the driven part 16b in a horizontal part of the guide part 14d of the rail 14. By this method, backward sliding along the rail in the back and forward direction can be regulated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cassette loading apparatus equipped in a magnetic recording / reproducing apparatus or the like, and more particularly to a cassette loading apparatus called a front loading system.

[0002]

2. Description of the Related Art A conventional cassette loading device 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, and FIG. 6C is a left side view thereof.
7D is a right side view thereof, FIG. 7 is a plan view of the cassette holder A assembled to the frame portion B, and FIG. 8 is a side view thereof.

First, the cassette holder A will be described. On the slider 1 on which the cassette m is placed, slider side plates 2 and 2 are integrally and almost vertically raised from the left and right ends thereof. A stopper piece 1 for receiving the front end portion of the cassette m which is inserted on the left and right sides of the slider 1.
a and 1b are integrally launched. The slider side plate 2 on the right side has first to third slider shafts 2a, 2
b and 2c are caulked in the outward protruding state. The first to third slider shafts 2a, 2b, 2c are symmetrically fixed to the left slider side plate 2 by caulking. Brackets 2 are attached to the upper edges of the slider side plates 2 and 2 so as to face inward
A and 2A are integrally formed by bending, and cassette pressing leaf springs 3 for elastically pressing the cassette m against the slider 1 are caulked to the brackets 2A and 2A. Left and right slider locks 4, 4 formed in a substantially L-shape are slidably mounted around the second slider shafts 2b, 2b in a state of sliding contact with the outer surfaces of the slider side plates 2, 2. Each slider lock 4,4
The bottom plate portion 4 has convex portions 4a, 4a at the center of the upper edge and wraps the lower side of the slider side plates 2, 2 inward at the lower end portion.
b, 4b are integrally formed by bending, and each bottom plate portion 4b,
The rising pieces 4c, 4c are integrally bent at the end of 4b. Slider lock springs 5 are laid between the slider side plates 2 and 2 and the slider locks 4 and 4, and the slider locks 4 and 4 are pulled and urged so that the convex portions 4a and 4a thereof face upward. There is. In such a biased free state, the rising pieces 4c, 4c of the slider locks 4, 4 are located slightly on the front side of the stopper pieces 1a, 1b of the slider 1. On the slider side plate 2 on the right side, a lock release lever 6 for unlocking the closed state of the front cover m ₁ (see FIG. 8) of the cassette m is provided swingably around the vertical axis (FIG. 6).
(D)).

Next, the frame portion B will be described with reference to FIGS. A pair of left and right frames 8, 8 are erected in parallel with each other near the left and right ends of the mechanical chassis 7. Flanges 8A and 8A are integrally bent at the upper edges of the frames 8 and 8 toward the inside. Top plates 9 and 10 are laid across the front and rear ends of the upper edges of the frames 8 and 8, respectively. A cassette cover 11 for opening and closing the front end portions of the opposing gaps of the left and right frames 8 and 8 is rotatably supported by the holes at the front upper corners of the frames 8 and 8 and is closed by a lid closing spring (not shown). Biased in the direction. A down guide 12 for supporting the bottom of the inserted cassette m and for guiding the descending of the cassette m toward the cassette loading position is laid across the upper and lower intermediate positions of the front end portions of both frames 8,8. Has been done. An open lever 13 for opening the cassette front lid m ₁ is provided at a lower surface position on the right side of the back side top plate 10.
Is attached.

The first slider shafts 2a, 2a of the cassette holder A are inserted into and guided by the frames 8, 8.
First letter-shaped guide holes 8a, 8a and second letter-shaped guide holes 8b, 8b 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,
It is held so as to be movable along 8b. Ribbed guide holes 8c, 8c for engaging and guiding the third slider shafts 2c, 2c when the cassette holder A is lowered are cut and raised inward in the both frames 8, 8. In the lower part of the inner surface of the right frame 8, the drive rail 14
Is attached so as to be slidable in the front-back direction. The drive rail 14 is formed with a lateral elongated hole 14a for allowing the drive rail 14 to slide back and forth by inserting a main shaft 15 which will be described later, and receives a driving force for sliding. Drive rack gear 1 for driving the passive rack gear 14b and the right drive arm 16 described later.
4c are formed. In addition, such a drive rail 14 is provided only on the right side.

A main shaft 15 is spanned between the lower ends of both frames 8 and 8 and is rotatably supported. The proximal 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 the main shaft 15
The mounting phases of 6 are the same and parallel to each other, so that both drive arms 16 and 16 rotate integrally in synchronization. A gear 17 meshing with the drive rack gear 14c is fixed to the main shaft 15 just outside the right drive arm 16.

The drive arms 16 and 16 are formed with elongated holes 16a and 16a along the longitudinal direction thereof, and the first slider shafts inserted into the first guide holes 8a and 8a of the frames 8 and 8, respectively. 2a, 2a are the long holes 16a, 16a
Has also been inserted. And both drive arms 16,
Mounted on the cassette 16 are cassette pressure springs 18, 18 which are leaf springs for pressing the first slider shafts 2a, 2a counterclockwise.

A lower end portion of a lid opening arm 19 for opening the cassette lid 11 is rotatably and pivotally supported on a lower portion of the left frame 8. This lid open arm 1
The upper end of 9 is in a state capable of abutting on the cassette cover 11, and the lower end is in a state capable of contacting 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
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 a worm wheel 22 and a pinion gear 21, which are coaxially provided on the shaft 20. Bottom plate portion 8B of the right frame 8
A worm 23 is rotatably supported by the worm wheel 22 in a state of meshing with the worm wheel 22, and the worm 23 is interlocked with a drive motor (not shown). A switch lever 24 is swingably supported by a bottom plate 8B of the right frame 8 via a shaft 25. One end of the switch lever 24 is in a state where it can come into contact with a cam (not shown) on the drive rail 14, and the other end is in a state where it can come into contact with a switch 26 attached to the right frame 8. The mechanical chassis 7 has a cassette stay 2 for mounting and supporting the bottom of the cassette m to be loaded.
7 are planted at 4 locations 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, is placed on the slider 1 of the cassette holder A, and is further inserted. The rear end of the cassette m is the rising pieces 4c, 4 of the slider locks 4, 4.
c (see FIG. 6), the slider locks 4 and 4 are swung clockwise against the slider lock springs 5 and 5, and the cassette m slides further to the back side and the stopper piece 1a of the slider 1 is moved. , 1b (see FIG. 6), and sliding on the slider 1 is stopped. The cassette m is pressed against the slider 1 from the upper side by the left and right cassette pressing leaf springs 3 and 3. As a result, the cassette m is stably held in the cassette holder A. When the slider locks 4 and 4 are swung clockwise, the protrusion 4
a and 4a come out of the engagement state with the holes in the flanges 8A and 8A of both frames 8 and 8, and the cassette holder A
Is unlocked. When the insertion of the cassette m is started, the front end portion of the cassette m opens and rotates the cassette lid 11 against a lid closing spring (not shown). In this state, the upper end of the lid open arm 19 has the cassette lid 11
Away from.

When the cassette m is further pushed, the state shown in FIG. 9 is obtained. That is, the cassette holder A moves inside the frame portion B to a slightly inner side. At this time, the first slider shafts 2a and 2a of the cassette holder A are guided through the first guide holes 8a and 8a of the left and right frames 8 and 8, and the second slider shaft 2b is guided into the second guide holes 8b and 8b. , 2b
Will be guided. When the first slider shafts 2a, 2a are moved to the inner side, the left and right drive arms 16, 16 which pass through the first slider shafts 2a, 2a through the long holes 16a, 16a are synchronized with each other and the main shaft is synchronized. It rotates counterclockwise around the axis of 15. 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
Since the gear 17 meshes with the drive rail 14, the drive rail 14 slightly slides inward as the gear 17 rotates.

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

When the drive rail 14 slides a little to the back side,
A cam (not shown) provided on the drive rail 14 swings the switch lever 24 around the shaft 25 to move the switch 2
Invert 6 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
From the worm wheel 22 to the pinion gear 21 via a double-acting mechanism (not shown). The pinion gear 21 drives the passive rack gear 1 of the drive rail 14.
It is transmitted to 4b as a sliding driving force toward the back side.

When the drive rail 14 is forcibly moved toward the inner side by the sliding drive force, the gear 17 meshed with the drive rack gear 14c of the drive rail 14 is rotated counterclockwise, and the main gear is rotated. The left and right drive arms 16, 16 are rotated counterclockwise in synchronization 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 back side, and the cassette holder A is moved to the back side together with the cassette m accordingly. 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 L-shaped second guides. It is guided to the holes 8b, 8b. Also, drive rail 1
In No. 4, since the elongated hole 14a relatively slides on the main shaft 15, sliding of the drive rail 14 is not hindered.

In this way, when the cassette holder A is moved to the rear side and brought into the state shown in FIG. 10, the third slider shafts 2c, 2c come into engagement with the ribbed guide holes 8c, 8c. 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 reaching 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, and the front lid m _{1 of the} cassette m is moved. Release the locked state of. Then, the protrusions 4a of the slider locks 4 and 4,
4a comes into sliding contact with the slightly lowered step portions of the flanges 8A and 8A of the frames 8 and 8, and the slider locks 4 and 4 are further swung clockwise against the slider lock springs 5 and 5, and the bottom plate 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 so that the upper end of the lid open arm 19 is brought into contact with the cassette cover 11. Therefore, instead of the cassette m, the lid open arm 19 holds the cassette cover 11 in the open posture.

A motor (not shown) is continuously driven,
The state shifts from the state of FIG. 10 to the state of FIG. That is, as the drive rail 14 is moved further inward, the drive arms 16 and 16 are further rotated counterclockwise, and the drive arms 16 and 16 move the first slider shafts 2a and 2a to the first side. The first guide holes 8a are pushed downward along the vertical portions of the guide holes 8a. Along with this, the second slider shafts 2b, 2b also move to the second guide hole 8
Since the third slider shafts 2c and 2c are also moved downward along the ribbed guide holes 8c and 8c, the cassette holder A is moved downward along with the cassette m. Will be moved. Then, the lid open arm 19 becomes the left drive arm 16
It comes to be separated from the cam (not shown) of FIG.
Lid open arm 19
To the home position. Also, the cassette front lid m ₁ is
Since it contacts the open lever 13 while descending, it is opened by the open lever 13.

The cassette m in the cassette holder A is placed and supported on the four cassette stays 27 in the mechanical chassis 7, and the cassette pressure spring 1 provided on the drive arms 16 and 16 which are about to rotate counterclockwise.
Since the 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 while being slightly lifted 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 reverses from the ON state to the OFF state and the drive motor is stopped. It

With the above, the loading operation of the cassette m is completed. The eject operation of the cassette m is performed in the reverse process of the above.

[0020]

In the conventional cassette loading apparatus described above, the cassette m is the cassette stay 2.
In the cassette loaded state in which the cassette pressure is applied to the cassette 7, the cassette pressure springs 18, 18 are connected to the first slider shafts 2a, 2
Due to the fact that a is being pressed, a reaction force is exerted on the drive arms 16 and 16 to return them clockwise and rotate them.
If the drive arms 16 and 16 are allowed to return and rotate, the pressing force against the cassette m is lost, which is a problem. Therefore, in this conventional example, a reverse rotation preventing mechanism including a worm wheel 22 and a worm 23 is adopted in order to regulate the return rotation of the drive arms 16 and 16 in the pressure-bonded state of the cassette m. .

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

However, the worm wheel 2 as described above
When the reverse rotation preventing mechanism composed of 2 and worm 23 is used, the switch 26
Between the worm wheel 22 and the pinion gear 21, in order to allow the initial movement of the drive rails 16 and 16 to the back side by a slight rotation of the drive arms 16 and 16 due to the manual operation required to switch the ON state to the ON state. A double-action mechanism must be provided. Then, together with the fact that a reverse rotation preventing mechanism composed of the worm wheel 22 and the worm 23 and a structure for engaging the drive rack gear 14c and the gear 17 are adopted, as a whole,
There is a problem that the number of parts is increased and the structure is complicated, which is an obstacle to downsizing of equipment and causes an increase in cost.

The present invention was devised in view of the above-mentioned circumstances, and even if the reverse rotation preventing mechanism and the double-acting mechanism having a complicated structure are omitted, the return movement of the drive arm in the crimping state of the cassette is suppressed. It is an object of the present invention to regulate the movement of the drive rail and still allow the artificial initial movement of the drive rail at the start of insertion of the cassette.

[0024]

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

[0025]

When the cassette is inserted into the cassette holder and further pushed in a little, the drive arm is artificially rotated and its passive portion presses the longitudinal portion of the L-shaped guide portion, so that the L-shaped guide portion is provided. The drive rail thus slid slightly in the initial stage, and the motor is driven by turning on the switch. The drive torque of the motor is given to the drive rail,
Since the L-shaped guide portion of the drive rail presses the passive portion of the drive arm, the drive arm is rotated, and accordingly, 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 the lateral portion of the L-shaped guide portion of the drive rail. When the cassette is in the crimped state, the reaction force of the rotation returns to the drive arm, but since the passive part of the drive arm is located in the lateral part of the L-shaped guide part, the reaction force is the L-shaped part of the drive rail. It is received by the lateral portion of the shaped guide portion, and the return rotation of the drive arm is restricted. Therefore, the return sliding force along the front-back 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 the cassette holder A is assembled to the 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, and FIG. 6C is a left side view thereof. ) Is a right side view thereof.

First, based on FIG. 6, cassette holder A
Will be described. Similar to the conventional example, on the slider 1 on which the cassette m is placed, slider side plates 2 and 2 are integrally and almost vertically raised from both left and right ends thereof. Stopper pieces 1a and 1b that receive the front end portion of the cassette m that is inserted are integrally raised on the left and right sides of the slider 1. First to third slider shafts 2a, 2b, 2c are caulked to the right slider side plate 2 so as to project outward. Also on the slider side plate 2 on the left side,
Symmetrically, the first to third slider shafts 2a, 2b, 2c
Has been crimped. Brackets 2A, 2A are integrally bent and formed inward at the upper edges of the slider side plates 2, 2 and the cassette m is 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 slidably mounted around the second slider shafts 2b, 2b 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 portion 4 at the center of the upper edge.
a, 4a, the slider side plate 2,
Bottom plate portions 4b, 4b that wrap around the lower part of 2 inward are integrally formed by bending, and rising pieces 4c, 4c are integrally formed by bending at the ends of the bottom plate portions 4b, 4b. Slider lock springs 5 and 5 are stretched between the slider side plates 2 and 2 and the slider locks 4 and 4, and the slider locks 4 and 4 are pulled and urged so that the convex portions 4a and 4a thereof face upward. There is. In the free state thus biased, the rising pieces 4 of the slider locks 4 and 4 are
c and 4c are located slightly in front of the stopper pieces 1a and 1b of the slider 1. On the slider side plate 2 on the right side, a lock release lever 6 for unlocking the closed state of the front lid m ₁ of the cassette m is provided swingably around the vertical axis.

Next, the frame portion B will be described with reference to FIGS. A pair of left and right frames 8, 8 are erected in parallel with each other near the left and right ends of the mechanical chassis 7. Flanges 8A and 8A are integrally bent at the upper edges of the frames 8 and 8 toward the inside. Top plates 9 and 10 are laid across the front and rear ends of the upper edges of the frames 8 and 8, respectively. A cassette cover 11 for opening and closing the front end portions of the opposing gaps of the left and right frames 8 and 8 is rotatably supported by the holes at the front upper corners of the frames 8 and 8 and is closed by a lid closing spring (not shown). Biased in the direction. A down guide 12 for supporting the bottom of the inserted cassette m and for guiding the descending of the cassette m toward the cassette loading position is laid across the upper and lower intermediate positions of the front end portions of both frames 8,8. Has been done. An open lever 13 for opening the cassette front lid m ₁ is provided at a lower surface position on the right side of the back side top plate 10.
Is attached.

The first slider shafts 2a, 2a of the cassette holder A are inserted into and guided by the frames 8, 8.
First letter-shaped guide holes 8a, 8a and second letter-shaped guide holes 8b, 8b 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,
It is held so as to be movable along 8b. Ribbed guide holes 8c, 8c for engaging and guiding the third slider shafts 2c, 2c when the cassette holder A is lowered are cut and raised inward in the both frames 8, 8. In the lower part of the inner surface of the right frame 8, the drive rail 14
Is attached so as to be slidable in the front-back direction. The drive rail 14 is formed with a lateral elongated hole 14a for allowing the drive rail 14 to slide back and forth by inserting a main shaft 15 which will be described later, and receives a driving force for sliding. A passive rack gear 14b is formed.
However, the drive rack gear 14c formed in the conventional example is not included. Instead, the drive rail 14
An L-shaped guide portion 14d having an upper end portion in the vertical direction and a lower end portion in the horizontal direction is formed at the upper side position of the elongated hole 14a in the front side portion. The horizontal portion of the L-shaped guide portion 14d is located on the front side with respect to the vertical portion. In the case of this embodiment, the L-shaped guide portion 14d is
It is formed as an arc-shaped long hole of approximately a quarter. The L-shaped guide portion 14d of the drive rail 14 is for driving the right drive arm 16 described later.

Incidentally, such a drive rail 14 is provided only on the right side.

A main shaft 15 is spanned between lower ends of both frames 8 and 8 and is rotatably supported. The proximal 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 the main shaft 15
The mounting phases of 6 are the same and 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 engaged with the L-shaped guide portion 14d of the drive rail 14 and is slidably guided is integrally projected. Incidentally, 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 that engages with the L-shaped guide portion 14d constitute a mechanism for interlocking the drive rail 14 and the drive arm 16.

The drive arms 16 and 16 are formed with elongated holes 16a and 16a along the longitudinal direction thereof, and the first slider shafts inserted into the first guide holes 8a and 8a of the frames 8 and 8, respectively. 2a, 2a are the long holes 16a, 16a
Has also been inserted. And both drive arms 16,
Mounted on the cassette 16 are cassette pressure springs 18, 18 which are leaf springs for pressing the first slider shafts 2a, 2a counterclockwise.

A lid opening arm 19 for opening the cassette case lid 11 is pivotally supported on the lower portion of the left frame 8 in the vicinity of the lower end thereof. This lid open arm 1
The upper end of 9 is in a state capable of abutting on the cassette cover 11, and the lower end is in a state capable of contacting 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
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 drive motor (not shown) is a pinion gear 2
It is linked to 1. However, the worm wheel 22 as the reverse rotation prevention mechanism provided in the conventional example
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 swingably supported by a bottom plate 8B of the right frame 8 via a shaft 25. One end of the switch lever 24 has a drive rail 14
The cam 26 (not shown) can come into contact with the other end, and the other end can come into contact with the switch 26 attached to the right frame 8. In the mechanical chassis 7, cassette stays 27 for placing and supporting the bottom portion of the cassette m to be loaded are planted 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 further inserted. The rear end of the cassette m is the rising pieces 4c, 4c of the slider locks 4, 4 (see FIG. 6).
The slider locks 4 and 4 in a clockwise direction against the slider lock springs 5 and 5, and the cassette m slides further toward the inner side to stop the stopper piece 1 of the slider 1.
It abuts against a and 1b (see FIG. 6) and the sliding on the slider 1 is stopped.

The cassette m is pressed against the slider 1 from the upper side by the left and right cassette pressing leaf springs 3 and 3. As a result, the cassette m is stably held in the cassette holder A. Slider lock 4,4
When is swung clockwise, the convex portions 4a, 4a come out of the engaged state 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 insertion of the cassette m, the cassette m
The front end portion of the device opens and rotates the cassette cover 11 against a cover closing spring (not shown). In that state, the upper end of the lid open arm 19 is separated from the cassette cover 11.

When the cassette m is further pushed, the state shown in FIG. 3 is obtained. That is, the cassette holder A moves inside the frame portion B to a slightly inner side. At this time, the first slider shafts 2a and 2a of the cassette holder A are guided through the first guide holes 8a and 8a of the left and right frames 8 and 8, and the second slider shaft 2b is guided into the second guide holes 8b and 8b. , 2b
Will be guided. When the first slider shafts 2a, 2a are moved to the inner side, the left and right drive arms 16, 16 which pass through the first slider shafts 2a, 2a through the long holes 16a, 16a are synchronized with each other and the main shaft is synchronized. It is artificially rotated counterclockwise around the axis of 15. With the counterclockwise rotation of the right drive arm 16, the passive portion 16b of the right drive arm 16 moves to the drive rail 1
The longitudinal portion of the L-shaped guide portion 14d formed in 4 is pressed toward the back side. 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, the motor is not yet supplied with power. That is, the initial sliding of the drive rail 14 is allowed by the idling of the motor.

When the drive rail 14 slides a little inward,
A cam (not shown) provided on the drive rail 14 swings the switch lever 24 around the shaft 25 to move the switch 2
Invert 6 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 passive rack gear 1 of the drive rail 14 is transmitted from the pinion gear 21.
It is transmitted to 4b as a sliding driving force toward the back side.

When the drive rail 14 is forcibly moved toward the rear side by the sliding drive force, the vertical portion of the L-shaped guide portion 14d provided on the drive rail 14 is driven by the drive arm 16 on the right side. The portion 16b is pushed and moved toward the back side. This allows 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 and 1
The first slider shafts 2a, 2a inserted through the six elongated holes 16a, 16a are forcibly moved to the back side, and the cassette holder A is moved to the back side together with the cassette m accordingly. At this time, in the cassette holder A, the first slider shafts 2a, 2a have L-shaped first guide holes 8a, 8a.
And the second slider shafts 2b and 2b are guided to the L-shaped second guide holes 8b and 8b. Further, since the elongated hole 14a of the drive rail 14 slides relatively on the main shaft 15, the sliding of the drive rail 14 is not hindered.

In this way, when the cassette holder A is moved to the rear side and brought into the state shown in FIG. 4, the third slider shafts 2c, 2c engage with the ribbed guide holes 8c, 8c. 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. When you reach this position, cassette holder A
The lock release lever 6 (see FIG. 6) is pressed by a cam (not shown) provided on the right frame 8 and swings inward to release the locked state of the front lid m ₁ of the cassette m. Then, the protrusions 4a, 4 of the slider locks 4, 4
a comes into slidable contact with the steps 8a, 8A of the frames 8, 8 which are slightly lowered, so that the slider lock 4,
4 is further swung clockwise against the slider lock springs 5 and 5, and the bottom plate portions 4b and 4b are connected to the cassette front cover m.
₁ will be open a little cassette front lid m ₁ pushed up. Further, a cam (not shown) provided on the left drive arm 16 causes the lid open arm 19 to move to the drive arm 1
6 rotates counterclockwise in synchronism with 6 to bring the upper end of the lid open arm 19 into contact with the cassette lid 11, so that the lid open arm 19 holds the cassette lid 11 in the open posture instead of the cassette m. Will be done.

The 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 moved further inward, the drive arms 16 and 16 are further rotated counterclockwise, and the drive arms 16 and 16 move the first slider shafts 2a and 2a to the first side. The first guide holes 8a are pushed downward along the vertical portions of the guide holes 8a. With this,
The second slider shafts 2b and 2b also have second guide holes 8b and 8b.
Since the third slider shafts 2c and 2c are also moved downward along the ribbed guide holes 8c and 8c, the cassette holder A is moved downward together with the cassette m. Will be. Then, the lid open arm 19 separates from the cam (not shown) of the left drive arm 16, and the biasing force of the lid closing spring (not shown) is exerted to rotate the cassette cover 11 to the closed posture and 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, it is opened by the open lever 13. Then, during this time, the passive portion 16b of the right drive arm 16 slides downward in the L-shaped guide portion 14d of the drive rail 14, and in the state of FIG. It will be located in the part.

The cassette m in the cassette holder A is placed and supported on the four cassette stays 27 of the mechanical chassis 7 and is mounted on the drive arms 16 and 16 which are about to rotate in the counterclockwise direction.
Since the 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 while being slightly lifted 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 reverses from the ON state to the OFF state and the drive motor is stopped. It

By the above, the loading operation of the cassette m is completed. The eject operation of the cassette m is performed in the reverse process of the above.

Now, the cassette pressure springs 18, 18
When the cassette m is crimped onto the cassette stay 27 by the above, the first slider shafts 2a and 2a that press the cassette crimp springs 18 and 18 are loaded.
Receives the reaction force of the clockwise return rotation from the cassette pressure 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 of the drive rail 14, the return turning force applied to the drive arms 16 and 16 is increased. Will be received by the lateral portion of the L-shaped guide portion 14d. Therefore, the drive arm 1
The return rotation of 6 and 16 is restricted. This is because the drive rail 14 is slidable in the front-rear direction, but its position is regulated in the up-down direction. Further, since the return turning force acts upward, the drive rail 14 is not moved back and forth along the front-rear direction, and the return slide of the drive rail 14 is also restricted.

That is, the structure for engaging the L-shaped guide portion 14d and the passive portion 16b constitutes the reverse rotation preventing mechanism. The structure of the reverse rotation prevention mechanism is much simpler than that of the conventional reverse rotation prevention mechanism including the worm wheel 22 and the worm 23. Further, the double-acting mechanism, which is interposed between the pinion gear 21 and the worm wheel 22 in the conventional example, becomes unnecessary. In addition, the drive rack gear 14
A structure for meshing the gear c with the gear c is not required, and as a whole, the structure can be simplified and the device can be downsized and the cost can be reduced by drastically reducing the number of parts.

[0049]

As described above, according to the present invention, the drive rail is provided with the L-shaped guide portion, the drive arm is provided with the passive portion, and the L-shaped guide portion and the passive portion are engaged with each other. ,
The return rotation reaction force that acts on the drive arm when the cassette is crimped can be received by the passive portion of the drive arm located at the lateral portion of the L-shaped guide portion of the drive rail, and the return rotation of the drive arm and Since the return slide of the drive rail along the front-rear direction can be regulated 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. In addition, the double-acting mechanism can be omitted. Therefore, the structure can be simplified, the size can be reduced, and the cost can be reduced by reducing the number of parts.

[Brief description of drawings]

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

FIG. 2 is a side view showing the structure of the cassette loading device of the embodiment and also for explaining the operation.

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

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

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

6A and 6B are a plan view, a front view, a left side view and a right side view showing a structure of a cassette holder common to the cassette loading devices of the embodiment and the conventional example.

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

FIG. 8 is a side view showing a structure of a cassette loading device of a conventional example and also explaining the operation.

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

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

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

[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 ... rib guide hole, 11 ... Casecon lid, 12 ... down guide, 1
3 ... Open lever, 14 ... Drive rail, 14a ...
… Oval hole, 14b …… Passive rack gear, 14d …… L-shaped guide part, 15 …… Main shaft, 16 …… Drive arm, 16a …… Oval hole, 16b …… Passive part, 18 ……
Cassette pressure spring, 19 ... Lid open arm,
21 ... Pinion gear, 24 ... Switch lever, 26
...... Switch, 27 …… Cassette stay

Claims (1)

[Claims] 1. A cassette holder (A) having a slider (1) for mounting a cassette (m), and an L-shaped path (8) for supporting the cassette holder (A).
a) a frame portion (B) slidably guiding along a, 8b), and a drive rail (14) slidably attached to the frame portion (B) in the front-rear direction and driven by a motor. And a drive arm (16) that is rotated in conjunction with the sliding of the drive rail (14) to slide the cassette holder (A) and crimp it downward.
A cassette loading device comprising: a drive rail (14) and a drive arm (16);
An L-shaped guide portion (14d) provided on the drive rail (14) having an upper end portion in a vertical direction and a lower end portion in a horizontal direction, and a mechanism for interlocking the mechanism with the L-shaped guide portion (14d).
A cassette loading device, characterized in that it is configured in combination with a passive part (16b) provided on the drive arm (16) in a state of being engaged with.