JP2589515Y2 - Cassette holder opening and closing mechanism - 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 holder opening / closing device which can open and close a cassette holder electrically using a rotational driving force of a motor.

[0002]

2. Description of the Related Art In recent years, a cassette holder opening and closing device has
A variety of electric cassette holder opening / closing methods have been adopted in order to realize a high-quality and high-precision opening / closing device with higher performance and lower cost.

An example of the above-described conventional cassette holder opening / closing device will be described below with reference to the drawings.

FIG. 8 shows an apparatus for electrically opening and closing a cassette holder of a conventional cassette holder opening and closing apparatus. In FIG. 8, reference numeral 1 denotes a loading base on which a motor / gear of an opening / closing device is mounted, and 2 denotes a cassette holder which is rotated by a support shaft 2a to open and close. Reference numeral 3 denotes a cassette mechanism; 3b, a leaf SW for cassette detection; and 3c, a leaf SW lever for simultaneously lifting the leaf SW 3b. Reference numeral 4 denotes a motor, which is fixed to the loading base 1 with screws. Reference numeral 14 denotes a pulley press-fitted into a motor shaft, 15 denotes a belt, and 7 denotes an intermediate gear. To communicate. 8 is a drive gear, 16 is a drive link cam, 17 is a leaf SW lifting rod, 18
Denotes a spring, and a spring force is applied in a direction in which the drive link cam 16 is constantly pushed out and in a direction in which the drive link cam 16 is pressed against the drive gear. The driving force from the intermediate gear 7 is transmitted to the driving gear 8,
A drive lever is moved by two cams provided on the same axis of the drive gear 8 to drive the leaf SW lifting rod 17 and lift the leaf SW lever 3c. On the other hand, the drive link cam 16 is moved to hold the drive link holder drive guide. The cassette holder 2 is opened and closed by the engagement of the holder drive pin 2d of the cassette holder 16a. Although FIG. 8 directly meshes with the drive gear 8 from the intermediate gear 7, another gear must be meshed with another gear for transmission reduction.

[0005]

However, the conventional cassette holder opening / closing device as described above requires components such as a driving cam, a driving link cam, and a driving lever to drive the cassette holder, and the cassette holder needs to be driven by an external force. To maintain the holding force, a spring load is required. Even if the cassette holder is closed suddenly, to prevent the gear from being damaged, it is driven by a cam and adopts a belt and pulley, and its transmission reduction mechanism. As a result, there are problems that a large number of speed reduction parts are required, the size of the opening / closing device is large, and that an extra load torque by a spring is required.

[0006] In view of the above-mentioned conventional problems, the present invention enables simplification of a cassette holder opening / closing mechanism and a leaf SW lifting mechanism. It is also an object of the present invention to provide a cassette holder opening / closing device that prevents the gear from being damaged and realizes downsizing even when the cassette holder is closed suddenly while maintaining the holding force of the cassette holder against external force. is there.

[0007]

SUMMARY OF THE INVENTION In order to solve the above problems, a cassette holder opening / closing device according to the present invention uses a transmission / reduction mechanism using a plurality of gears to transmit a rotational driving force of a motor and a cassette holder opening / closing rotation shaft. The cassette holder is opened and closed by meshing with concentric gears.
In the transmission reduction mechanism, a part of the gear meshing with the gear concentric with the opening / closing support shaft of the cassette holder is cut off, and while the missing part of the gear idles in a non-meshing state, the gear The opening and closing rotation of the cassette holder is stopped or braked by the engagement of the cam groove provided and the pin provided on the cassette holder, and during the idle rotation in a state where the missing part of the missing gear is not engaged. And a mechanism for moving a leaf switch of the cassette mechanism by rotating a cam provided on a concentric shaft of the gear in the same manner.

In addition, a friction mechanism having a transmission force due to a certain frictional force is provided, and a mechanism is provided for providing a holding force for opening and closing the cassette holder.

[0009]

According to the present invention, since the cassette holder is driven directly by the transmission / reduction mechanism using a plurality of gears to open and close the cassette holder, the components such as a drive link cam and a drive lever are unnecessary. The mechanism and the leaf SW lifting mechanism can be simplified.

Further, since there is no spring applied to the drive link cam, no spring load is required by the spring, and no extra drive torque is required, so that a stable cassette holder opening / closing device can be realized.

Further, it is possible to prevent the gear from being damaged even when the cassette holder is suddenly closed while giving the cassette holder a holding force against an external force by a friction mechanism having a certain frictional force, thereby realizing the miniaturization of the opening / closing mechanism. I can do it.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a cassette holder opening / closing mechanism according to the present invention will be described in detail with reference to FIGS.

FIG. 1 is a perspective view of the entire mechanism of the cassette holder opening / closing mechanism according to an embodiment of the present invention. FIG. 2 is an exploded view of the mechanism for opening and closing the cassette holder according to the embodiment of the present invention. FIG. 3 is a side view of the cassette holder opening / closing mechanism with the cassette holder closed. FIG. 4 is a side view of the cassette holder opening / closing mechanism in a state where the cassette holder is completely opened.

1 to 4, reference numeral 1 denotes a loading base on which a motor / gear of an opening / closing mechanism is mounted, and 2 denotes a cassette holder, which is opened and closed with a support shaft 2a as a rotation axis. 2b is a gear of a cassette holder, 3 is a cassette mechanism, 3b is a leaf SW, 3c is a leaf SW lever for lifting the leaf SW 3b in conjunction with each other, and 4 is a motor, which is fixed to the loading base 1 with screws. 5 is a worm press-fitted into the motor shaft, 6 is a friction mechanism, 6b is a worm gear, 6d is a clutch plate, 7 is an intermediate gear, 12 is a clutch spring, 13 is a spring holding plate, and the friction mechanism 6 is a worm gear 6b.
, The friction surface of the intermediate gear is pressed by the clutch spring 12 against the friction surface on the worm gear side with the clutch plate 6 d interposed therebetween.
The worm gear is engaged by hooking or fixed by press-fitting, and inserted into the worm gear shaft 6a. A drive gear 8 is inserted into the drive gear shaft 8a. 9 is a leaf SW lifting lever, 10 is an end detection SW, 10a is a SW movable piece, and 11 is a SW operation lever. Reference numeral 20 denotes a panel grill for mounting the entire mechanism and a cassette holder shaft 2.
a receptacle. Reference numeral 20a denotes a holder stopper, which is used to hold the holder provided on the panel grill in the opening direction. 21 is a cassette.

Next, the operation of the present invention will be described in detail with reference to FIGS. 5A and 5B show the positional relationship of each component when the operation in the closing direction is completed with the cassette holder closed, and FIG. 5A shows the cam of the driving gear and the SW operation lever leaf SW at that time. 7B shows the positional relationship of the lifting lever, and FIG. 7B shows the engaging positional relationship between the holder teeth and the holder cam A on the drive gear side and the cassette holder gear and the holder drive pin on the cassette holder at that time.

FIG. 6 shows that the cassette holder is closed and
The state when the opening is started, or the state when the cassette holder is closed and the leaf SW lifting lever starts to be lowered, (A) shows the driving gear cam and the SW operation lever / leaf SW lifting at that time. FIG. 7B shows the positional relationship between the levers, and FIG. 7B shows the engaging positional relationship between the holder teeth and the holder cam A on the drive gear side and the cassette holder gear and holder drive pin on the cassette holder side at that time.

FIG. 7 shows the positional relationship of each component when the operation in the opening direction is completed with the cassette holder opened, and FIG. 7A shows the driving gear cam and SW at that time.
FIG. 7B shows the positional relationship between the operating lever and the leaf SW lifting lever, and FIG. 7B shows the engaging positional relationship between the holder teeth on the drive gear side and the cassette holder gear on the cassette holder side at that time. In FIGS. 5 to 7, reference numeral 2d denotes a relationship between the drive gear while the teeth are missing at the holder drive pin and the engagement with the cassette holder.
Reference numeral 8b denotes a tooth on the middle side of the drive gear, and 8c denotes a tooth on the drive gear holder side. A part of the teeth is missing, and the teeth start from the angle A. 8d is a lifting lever cam, 8
e is a SW lever cam, and these two cams are formed on the back surface of the drive gear. 8f is a holder cam A, 8g is a holder cam B, and 8h is a tapered surface formed on the surface of the drive gear. 9a is a lever shaft, 9b is a lever drive pin, 9c is a lever hook part, and 9d is a leaf SW lever lifting part.

The operation of the mechanism for opening and closing the cassette holder configured as described above will be described below.

First, the rotational driving force of the motor 4 causes the worm 5 to rotate, the worm gear 6b to rotate, and the clutch plate 6 to rotate.
The intermediate gear 7 is rotated by the frictional force d, and the gear 8c, which is transmitted to the drive gear 8b and has some teeth missing, starts to rotate clockwise from the angle A. However, since the gear 8c lacks teeth, the drive gear idles without engagement with the gear 2b of the cassette holder. At this time, the cassette holder does not open and close and is kept in position by the engagement between the arc-shaped holder cam A8f and the holder drive pin 2d provided on the cassette holder on a concentric axis with the drive gear provided on the drive gear. . On the other hand, on the back surface of the drive gear, the lifting lever cam 8d and the SW lever cam 8e rotate clockwise, and the leaf SW lifting lever 9 rotates about the lever shaft 9a by the engagement of the lever driving pin 9b to lift the leaf SW lever. The leaf SW is lifted by the part 9d,
The W lever 11 moves from the state where the SW operation piece 10a is pressed to the S
Rotate in the direction away from the W lever shaft 11a as an axis, and change the end detection SW 10 from the on state to the off state.

Next, as shown in FIG.
From this angle to the angle of B, the leaf SW lifting lever 9 lifts the leaf SW, removes the lever hook 9c hooked on the cassette holder hook 2c, and makes the cassette holder open. On the front side, the teeth 8c on the drive gear holder side are B
, The meshing with the gear 2b of the cassette holder starts, and the cassette holder rotates about the shaft 2a of the cassette holder and starts to open.

At this time, the holder drive pin 2d of the cassette holder rotates in the opening direction and moves in an arc at an angular velocity due to the engagement between the cassette holder gear 2b and the teeth of the drive gear holder. One drive gear is rotating at a certain angular velocity on the power source side, so that the holder drive pin 2
The holder cam 8f engaged with d moves to 8g of the holder cam B which is a curve corresponding to the locus of the holder drive pin in the drive gear due to the movement of the two angular velocities. The timing at which the meshing of the teeth starts from the point where the teeth are engaged can be reliably taken.

Further, in order to ensure this timing, the groove width of the holder cam B is set near the transition point from the holder cam A, the clearance (gap) between the holder drive pin and the outer periphery of the drive gear is small, that is, Once the meshing of the gears is complete, gradually increase the clearance. It is also possible to make the timing of the transition point more reliable by narrowing the tip of the tooth tip with the shape of the tooth of the first tooth from where the gear is missing.

Next, as shown in FIG. 7, when the drive gear rotates from the angle A to the angle C, the teeth of the drive gear holder 8c engage with the cassette holder gear 2b, so that the cassette holder rotates. Then, the cassette holder 2 is driven until it is completely opened by hitting the holder stopper 20a. At this time, S
With the W lever cam 8e, the SW operation lever 11 is moved before the stopper to depress the SW operation piece 10a, the end detection SW 10 is activated, the rotation of the motor is stopped, and the opening operation is completed.

The operation in the closing direction can be performed by reversing the rotation direction of the motor and performing the operation opposite to the opening operation.

As described above, according to the present embodiment, by employing a transmission reduction mechanism for a plurality of gears, in particular, a worm and a worm gear, downsizing is realized and parts such as a drive link cam and an operation lever are used. Do not place the cassette holder
By driving the gear with a part of the gear missing and the cam groove provided in the gear, the cassette holder opening / closing mechanism and the leaf SW lifting mechanism can be simplified and downsized. This facilitates mounting on small products.

[0026]

As described above, according to the present invention, the opening and closing drive of the cassette holder is performed by setting a part of the gears in the transmission reduction mechanism using a plurality of gears to a state in which a part of the gears is missing, and the missing part is not engaged. During idling, the opening and closing of the gear is stopped or braked by the engagement of the cam groove provided on the same gear with the pin provided on the cassette holder, while the leaf SW is lifted by the cam provided on the same gear. By moving the lever, the opening and closing of the cassette holder can be synchronized, and the driving force at the time of opening and closing can be reduced. Further, since the cassette holder is directly driven, components such as a drive link cam and a drive lever are not required, and the cassette holder opening / closing mechanism and the leaf SW lifting mechanism can be simplified.

Further, since there is no need for an extra driving torque of a spring load due to the spring, a stable cassette holder opening / closing device can be realized. Even if an external force such as abruptly closing the cassette holder is applied while maintaining the cassette holder's holding force against external force by a friction mechanism having a certain frictional force, the driving force is transmitted to the friction mechanism, and the friction mechanism is operated. When the clutch plate idles when a certain frictional force is exceeded,
The gear can be prevented from being damaged, the size of the opening / closing mechanism can be reduced, and mounting on a product can be facilitated.

[Brief description of the drawings]

FIG. 1 is a perspective view of an entire mechanism of a cassette holder opening / closing mechanism according to an embodiment of the present invention;

FIG. 2 is an exploded configuration diagram of a mechanism of an opening / closing mechanism of the cassette holder.

FIG. 3 is a side view of the cassette holder opening / closing mechanism when the cassette holder is closed.

FIG. 4 shows a state in which the cassette holder is completely opened.
Side view of cassette holder opening and closing mechanism

FIG. 5A is a view showing a state in which the cam of the drive gear and S when the operation in the closing direction is completed with the cassette holder closed.
FIG. 7B shows the positional relationship between the W operation lever and the leaf SW lifting lever. FIG. 7B shows the state in which the cassette holder is closed, and when the operation in the closing direction is completed, the holder side teeth and the holder cam on the drive gear side. FIG. 7A is a diagram showing the engagement positional relationship between a cassette holder gear and a holder drive pin on the cassette holder side.

FIG. 6A is a diagram showing a state in which the cassette holder is closed and starts to be opened, or a cam of the drive gear and a SW operation lever when the cassette holder is closed and the leaf SW lifting lever starts to be lowered; The diagram (B) showing the positional relationship of the leaf SW lifting lever is shown when the cassette holder is closed and starts to be opened, or when the opposite cassette holder is closed and the leaf SW lifting lever starts to fall. FIG. 6 is a diagram showing the engagement positional relationship between the holder teeth and the holder cam A on the drive gear side and the cassette holder gear and holder drive pin on the cassette holder side.

FIG. 7A shows a state in which the cassette holder is opened and the cam of the drive gear and S when the operation in the opening direction is completed.
FIG. 8B shows the positional relationship of the W operation lever leaf SW lifting lever. FIG. 8B shows the cassette holder in the opened state, and the holder side teeth of the drive gear when the operation in the opening direction is completed, and the cassette holder. Showing the engagement position relationship of the cassette holder gear on the side

FIG. 8 is a perspective view of the entire mechanism of the conventional cassette holder opening / closing device.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 loading base 2 cassette holder 3 cassette mechanism 4 motor 5 worm 6 friction mechanism 8 drive gear 10 end detection SW 14 motor pulley 15 belt 16 drive link cam 18 spring

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G11B 15/675 101

Claims (3)

(57) [Scope of request for utility model registration] 1. A transmission reduction mechanism, wherein a rotational speed of a motor is transmitted and reduced by a transmission reduction mechanism using a plurality of gears and a gear concentric with an opening and closing rotation support shaft of the cassette holder. In a state where a part of a gear meshing with a gear concentric with the opening / closing support shaft of the cassette holder is missing, a cam provided on the gear is provided while the missing part of the gear idles without meshing. By the engagement of the groove and the pin provided on the cassette holder,
The opening and closing rotation of the cassette holder is stopped or braked, and the cam provided on the concentric shaft of the gear is also rotated during idling while the missing part of the missing gear is not engaged. And a mechanism for moving a leaf switch of the cassette mechanism. 2. A pressure is applied by a spring to the transmission reduction mechanism so that a clutch plate is interposed between the gears on the concentric shaft so as to have a certain frictional force. 2. The cassette holder opening / closing mechanism according to claim 1, further comprising a friction mechanism for transmitting a driving force. 3. The transmission reduction mechanism includes a worm and a worm gear, and further includes a clutch plate sandwiched in the transmission mechanism, and a pressure applied by a spring so as to have a certain frictional force. Equipped with a friction mechanism that transmits the driving force by force, the holding force for opening and closing the cassette holder is held by the friction force of the friction mechanism, and when an external force in the opening and closing direction is applied to the cassette holder, the driving force is Conveyed to
2. The cassette holder opening / closing mechanism according to claim 1, wherein the clutch plate idles when the friction mechanism exceeds a certain frictional force.