JPH09245403A - Erroneous mounting prevention mechanism for cassette mounting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent failure by erroneous mounting in mounting a magnetic tape cassette onto a magnetic tape recording and reproducing device, with a simple structure. SOLUTION: A slider 2 sets a cassette 1 thereon. A guide plate 3 holds pins 2a, 2b, 2c of the slider 2 corresponding to three guide grooves 3a, 3b, 3c, and guides these pins horizontally and vertically. A rack 6 is horizontally driven in parallel to the guide plate 3 and its driving force is transmitted to a driving lever 7. By the rotational driving force transmitted thereto, the driving lever 7 drives the pin 2c of the slider. The rack 6 has a protruding end portion 6a to close a vertical portion of the L-shaped guide groove 3b of the guide plate 3 on completion of mounting the cassette.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an erroneous loading prevention mechanism of a cassette loading apparatus suitable for application to a magnetic tape recording / reproducing apparatus such as a VTR (video tape recorder).

[0002]

2. Description of the Related Art FIG. 4 is a side view showing a conventional cassette loading device in a VTR. The slider 2 has the cassette 1 mounted thereon, and a crimp spring 4 for crimping the cassette 1 is attached. The guide plate 3 has three guide grooves 3a, 3
slider pins 2a, 2b, 2c corresponding to b, 3c
While holding, guide horizontally and vertically. The rack 14 is horizontally driven by a motor (not shown) in parallel with the guide plate 3, and the driving force is transmitted to the drive lever 7 by the cylindrical gear 7b that constitutes the rack and pinion. The drive lever 7 drives the pin 2c of the slider using the transmitted drive force as a rotational movement. A magnetic head, a magnetic tape running device (not shown), and a lid pushing-up mechanism 9 are placed and fixed on the chassis 5.

The drive lever 7 has a T-shaped groove 7a for fixing the cassette 1 to the chassis 5 by a spring 8 when the cassette 1 is completely loaded.

Next, the operation of loading a magnetic tape cassette (hereinafter referred to as a cassette) having a lid and a positioning hole for protecting the magnetic tape will be described. Cassette 1 is A
When it is placed and inserted in the slider 2 from the direction, the pressure spring 4
It is fixed by pressure. Then, the rack 14 is linearly driven in the A direction, and its driving force is transmitted to the driving lever 7 as a rotational driving force by the rack and pinion. The driving lever 7 transmits the rotational driving force to the pin 2c of the slider. As a result, the cassette 1 is moved integrally with the slider 2 in the horizontal direction along the three guide grooves 3a, 3b, 3c provided on the guide plate 3, and the bent portion 3b of the guide grooves 3b, 3c is moved.
The pins 2a, 2b, 2c of the slider are vertically guided by b and 3cc. At that time, the lid pushing-up mechanism 9 pushes the lid 1c of the cassette open, and the spring 1 fixes the cassette 1 to the chassis 5 by pressure. A sensor (not shown) detects the state in which the cassette 1 is pressed and fixed to the chassis 5 depending on the position of the rack 14 or the drive lever 7, and the magnetic tape is pulled out from the cassette 1 to perform magnetic recording or reproduction. .

At this time, because there is a foreign substance between the chassis 5 and the cassette 1 or there is an abnormality in the cassette 1, the pins 2a, 2b and 2c of the slider are inserted into the guide grooves 3a, 3b and 3c of the guide plate 3. If it stops in the middle of the vertical portion, the groove 7a of the drive lever 7 has a T shape,
With the horizontal drive of the rack 14, only the drive lever 7 continues to rotate, and reaches the same position as when the cassette 1 is normally loaded.

As a result, even though the cassette 1 is erroneously loaded, the sensor detects that the cassette 1 is pressed and fixed to the chassis 5, and the magnetic tape is pulled out in the erroneously loaded state. .

In order to avoid the above-mentioned state, conventionally, an erroneous loading detection sensor is provided in the chassis 5, and the erroneous loading is prevented by directly detecting the state in which the cassette 1 is pressure-bonded to the chassis 5. Therefore, the cost is increased due to the increase in the number of parts and the reliability is deteriorated due to the complicated mechanism.

[0008]

However, due to recent demands for cost reduction and high reliability, there has been a demand for a mechanism that eliminates the erroneous loading detection sensor and does not cause erroneous loading.

Therefore, the present invention has been made to solve the above-mentioned conventional problems. When the cassette is not normally loaded due to foreign matter or the like, the drive portion hits the mechanical component and does not reach the normal loading position. It is an object of the present invention to provide an erroneous loading prevention mechanism for a cassette loading device, which does not erroneously recognize that the sensor has been loaded, and thus enables the erroneous loading detection sensor to be abolished, thereby realizing cost reduction and improved reliability.

[0010]

In order to solve the above-mentioned problems, the erroneous loading prevention mechanism of the cassette loading device according to claim 1 of the present invention is built in a magnetic tape recording / reproducing device using a magnetic tape cassette. In a cassette loading device for loading the magnetic tape cassette, a cassette holding portion having a pin for holding and guiding the inserted magnetic tape cassette on the outer side surface for placing and moving the inserted magnetic tape cassette, and the cassette holding portion. A guide plate having an L-shaped groove for holding and guiding the pins in the horizontal and vertical directions; a drive lever that makes a rotational motion to drive the pins of the cassette holding section in the horizontal and vertical directions; A linear driving unit that linearly moves in parallel with the horizontal portion of the L-shaped groove of the guide plate and transmits the driving force of the linear movement as the driving force of the rotational movement of the drive lever. For example, the pin of the cassette holder is,
It is characterized in that the end portion of the linear drive portion projects so as to close the vertical portion of the L-shaped groove when reaching the vertical lower end portion of the L-shaped groove which is the cassette loading completion position.

According to a second aspect of the present invention, there is provided an erroneous loading prevention mechanism for a cassette loading device, wherein the means for constituting the erroneous loading prevention mechanism for the cassette loading device according to the first aspect drives a linear motion of a linear drive section. The transmission of the rotational force of the drive lever from the force to the drive force is performed by a rack and pinion which is a pair of a rack and a cylindrical gear.

With the above structure, the erroneous loading prevention mechanism of the cassette loading apparatus according to the first aspect of the present invention is configured to linearly close the vertical portion of the L-shaped groove of the guide plate when the cassette is completely loaded. If the cassette is not properly loaded and is not crimped to the chassis due to foreign matter, etc. due to the protruding end of the drive unit, the end of the linear drive unit hits the pin of the cassette holding unit and the linear drive unit and drive lever Does not reach the normal loading position, so the sensor does not misidentify that loading is complete.

In the erroneous loading prevention mechanism of the cassette loading device according to the second aspect of the present invention, since the driving force is transmitted from the linear driving portion to the driving lever by the rack and pinion, the driving force can be reliably transmitted. .

[0014]

1 is a perspective view of an erroneous loading prevention mechanism of a cassette loading apparatus according to an embodiment of the present invention applied to a VTR. FIG. 2 is a side view of the erroneous loading prevention mechanism of the cassette loading device according to the present embodiment, showing a state where loading of the cassette is completed.

The slider 2 includes a slider bottom plate 2e,
The slider side plates 2d and 2f are formed, and the connecting rod 10 connects the slider side plates 2d and 2f. Each of the slider side plates 2d and 2f has a pin for holding and guiding on the outer side surface thereof, and a crimp spring 4 for crimping the cassette is mounted on the upper part thereof. The slider 2 mounts and moves the cassette. The guide plate 3 has a slider pin 2 corresponding to the three guide grooves 3a, 3b, 3c.
While holding a, 2b and 2c, they are guided in the horizontal and vertical directions. The guide plate 3 and the guide plate 11 are connected to each other by the connecting plate 12.
It is connected by. The rack 6 is driven in the horizontal direction in parallel with the guide plate 3 by a motor (not shown), and the driving force is transmitted to the drive lever 7 by the cylindrical gear 7b that constitutes the rack and pinion. The drive lever 7 drives the pin 2c of the slider using the transmitted drive force as a rotational movement.
A magnetic head, a magnetic tape running device (not shown), and a lid pushing-up mechanism 9 are placed and fixed on the chassis 5.

The drive lever 7 has a groove 7a having a T-shape so that the cassette 1 is pressed and fixed to the chassis 5 by the spring 8 when the cassette 1 is completely loaded.

As shown in FIG. 2, the rack 6 has an L-shaped guide groove 3b of the guide plate 3 when the cassette is completely loaded.
The end portion 6a thereof projects so as to close the vertical portion of the.

Next, the operation of loading the cassette 1 will be described. In the present embodiment, a cassette with a lid for protecting the magnetic tape is used. When the cassette 1 is placed and inserted in the slider 2 from the direction A, the cassette 1 is crimped and fixed by the crimp spring 4. Then, the rack 6 is linearly driven in the A direction, and the driving force thereof is transmitted to the driving lever 7 as a rotational driving force by the rack and pinion. The driving lever 7 transmits the rotational driving force to the pin 2c of the slider. As a result, the cassette 1 moves together with the slider 2 in the horizontal direction along the three guide grooves 3a, 3b, 3c provided in the guide plate 3, and the bent portions 3bb, 3cc of the guide grooves 3b, 3c are moved. The slider pins 2a, 2b, 2c are guided in the vertical direction. At that time, the lid pushing-up mechanism 9 pushes open the lid 1c of the cassette, and the spring 8 causes the cassette 1 to move to the chassis 5
Is fixed by crimping. When the cassette is completely loaded, the rack 6 closes the vertical portion of the L-shaped guide groove 3b of the guide plate 3 with the protruding end portion 6a. A sensor (not shown) detects the state in which the cassette 1 is pressed and fixed to the chassis 5 depending on the position of the rack 6 or the drive lever 7, and the magnetic tape is pulled out from the cassette 1 for magnetic recording or reproduction. .

At this time, there is a foreign substance between the chassis 5 and the cassette 1 or there is an abnormality in the cassette 1, so that the pins 2a, 2b and 2c of the slider fit into the guide grooves 3a, 3b and 3c of the guide plate 3. If it stops in the middle of the vertical portion, the protruding end portion 6a of the rack 6 hits the pin 2b of the slider and cannot move any further. as a result,
The rack 6 cannot rotate the drive lever 7 further from that position.

In FIG. 3, the foreign matter 13 causes the pins 2a, 2b, 2c of the slider to move into the guide grooves 3a, 3 of the guide plate 3.
FIG. 6 is a side view showing a state in which the protruding end portion 6a of the rack 6 hits the pin 2b of the slider when it stops in the middle of the vertical portions of b and 3c.

With the above-described structure, when the cassette 1 is not normally loaded and is not pressed against the chassis 5 due to foreign matter, the rack 6 which is a linear drive portion is used.
Since the protruding end portion 6a hits the pin 2b of the slider and the rack 6 and the drive lever 7 do not reach the normal loading position, the sensor does not mistakenly recognize that the loading is completed. Therefore, it becomes possible to abolish the incorrect loading detection sensor,
Achieved cost reduction and reliability improvement by reducing the number of parts.

[0022]

As described above, the erroneous loading prevention mechanism of the cassette loading apparatus according to the first aspect of the present invention is configured to close the vertical portion of the L-shaped groove of the guide plate when the cassette is completely loaded. , If the cassette is not normally loaded due to foreign matter or the like and the chassis is not crimped due to the protruding end of the linear drive, the end of the linear drive hits the pin of the cassette holder, and the linear drive and Since the drive lever does not reach the normal loading position, the sensor will not mistakenly recognize that loading is complete. As a result, it is possible to eliminate the erroneous loading detection sensor, which reduces costs and improves reliability by reducing the number of parts.

In the erroneous loading prevention mechanism of the cassette loading device according to the second aspect of the present invention, since the driving force is transmitted from the linear driving portion to the driving lever by the rack and pinion, the driving force can be reliably transmitted. , Improved reliability.

[Brief description of drawings]

FIG. 1 is a perspective view of an erroneous loading prevention mechanism of a cassette loading device according to an embodiment of the present invention.

FIG. 2 is a side view of the erroneous loading prevention mechanism of the cassette loading device according to the exemplary embodiment of the present invention, showing a state in which the cassette is completely loaded.

FIG. 3 is a side view of the erroneous loading prevention mechanism of the cassette loading device according to the exemplary embodiment of the present invention, showing a state in which a cassette is erroneously loaded.

FIG. 4 is a side view showing a conventional cassette loading device.

[Explanation of symbols]

 1 cassette 2 slider 2a, 2b, 2c pin 3 guide plate 3a, 3b, 3c guide groove 4 crimping spring 5 chassis 6 rack 7 drive lever 8 spring 9 lid lifting mechanism 10 connecting rod 11 guide plate 12 connecting plate

Claims (2)

[Claims] 1. A magnetic tape recording / reproducing apparatus using a magnetic tape cassette, which is built in a cassette loading apparatus for loading the magnetic tape cassette, wherein an inserted magnetic tape cassette is placed and moved, so that an outer surface is provided. A cassette holding part having a pin for holding and guiding the cassette holding part, a guide plate having an L-shaped groove for holding the pin of the cassette holding part and guiding it horizontally and vertically, and a pin of the cassette holding part. In order to drive in the horizontal direction and the vertical direction, a driving lever that makes a rotary motion and a linear motion that is parallel to the horizontal portion of the L-shaped groove of the guide plate, and the driving force of the linear motion is the rotational motion of the drive lever. A linear drive portion that transmits as a driving force, and when the pin of the cassette holding portion reaches a vertical lower end portion of the L-shaped groove that is a cassette loading completion position, Serial L so as to close the vertical part of the shaped channel, loading errors preventing mechanism of a cassette loading apparatus characterized by the ends of the linear drive portion projects. 2. The rack and pinion, which is a pair of a rack and a cylindrical gear, transmits the drive force of the linear motion of the linear drive unit to the drive force of the rotary motion of the drive lever. Erroneous loading prevention mechanism of the cassette loading device.