JPH0452844Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a cassette mounting device provided in a magnetic recording/reproducing device such as a VTR.

<Prior Art> A magnetic recording and reproducing apparatus is equipped with a cassette mounting device that moves a cassette holder with a tape cassette mounted thereto to a predetermined recording/reproducing position.

The conventional cassette loading device has been replaced with a second one.
This will be explained using Figures a, b, c to 4.

Here, FIG. 2a is a front view showing the tape cassette being inserted into the cassette holder, and FIG. 2b is
3 is a side view of the cassette holder showing a tape cassette being inserted into the cassette holder, FIG. FIG. 3B is an explanatory diagram showing the state immediately before the start of movement of the cassette holder, FIG. 4 is a diagram illustrating problems in the prior art.

As shown in FIG. 2a, conventionally used cassette loading devices hold a tape cassette 17 containing a magnetic tape, and move the tape cassette 17 between the take-out position and a predetermined recording/playback position. A movable cassette holder 1 is provided.

This cassette holder 1 is housed in a cassette house provided in the main body of the magnetic recording/reproducing apparatus.
The tape cassette 17 is movable between an ejecting position and a predetermined recording/reproducing position along a guide groove formed on the wall of the cassette house.

As shown in FIG. 2b, the cassette holder 1 has a first camshaft 1a and a second camshaft mounted on a plate near both front and rear ends in the insertion direction of the tape cassette 17.
A camshaft 1b is formed to protrude.

Further, as shown in FIGS. 3a and 3b, a first guide groove 5a and a second guide groove 5b are formed parallel to each other in a substantially L-shape on the wall surface of the cassette house, and the first camshaft 1a is the first guide groove 5a
, the second camshaft 1b is connected to the second guide groove 5b.
In the engaged state, the cassette holder 1 is disposed so as to be movable within a cassette house provided in the main body of the magnetic recording/reproducing apparatus along first and second guide grooves 5a and 5b.

Further, a shaft 23 is fixed to the wall of the cassette house, and a first gear 7 and a second gear 8 are rotatably attached to the shaft 23, and the second gear 8 has a protrusion 8P and a long hole 8C. is formed, and the first gear 7
A protrusion 7P that loosely engages with this elongated hole 8C is formed in the protrusion 7P.

A spring 24 is wound around the shaft 23, one end of which is locked to the projection 8P, and the other end of the spring 24 is locked to the projection 7P.

Further, a third gear 6 that meshes with the first gear 7 described above is rotatably attached to the wall of the cassette house. It has a piece 6A, and this protruding piece 6A
An elongated hole 6C is formed in the elongated hole 6C, and the aforementioned first camshaft 1a is engaged with this elongated hole 6C.

Furthermore, as shown by the two-dot chain line in FIG.
is rotatably attached to the wall of the cassette house.

On the other hand, as shown in FIGS. 2b and 2c, a first lever 3 having an engagement hole 3C is rotatably inserted into the second camshaft 1b.
The second lever 2 is inserted from above so as to engage the protrusion 2P with the engagement hole 3C.

A spring 4 is wound around the second camshaft 1b, one end of which is fixed to the cassette holder 1, and the other end of the spring 4 is fixed to the second lever 2.

Furthermore, a stopper 18 is attached to the cassette house as shown in FIGS. 2b and 2c, and in the state shown in FIG.
When pushed in, an engaging pawl 20 formed at the tip of the second lever 2 is engaged with the stopper 18.

Furthermore, the end of the first lever 3 is bent toward the edge of the cassette holder 1 toward the tape cassette 17 held by the cassette holder 1, as shown in FIG. 2a. The bent end portion is further bent to form a locking piece 21 that can lock with the tape cassette 17.

In a conventionally used cassette loading device having such a configuration, when the tape cassette 17 is inserted into the tape cassette loading opening and the tape cassette 17 is pushed into the cassette holder 1, the leading end of the tape cassette 17 2. Push the locking side 21 of the first lever 3 in the state shown in FIG. 2b in the direction of arrow X.

For this purpose, the first lever 3 rotates with respect to the second camshaft 1b in the direction of the arrow θ shown in FIG. 2b against the biasing force of the spring 4.

When this rotation reaches a predetermined angle, the second lever 2 rotates against the spring 4 about the second camshaft 1b in the direction of the arrow ψ shown in FIG. 2c.

This rotation moves the second lever 2 to a position where it does not engage with the stopper 18, and the tape cassette 17 is completely inserted into the cassette holder 1 to a predetermined position, and at this time, the cassette holder 1 is inserted into the cassette house. , the state is as shown in FIG. 3a.

In the state shown in FIG. 3a, the second lever 2
The engagement with the stopper 18 is released, and the cassette holder 1 is now movable along the first and second guide grooves 5a and 5b, but the cassette holder 1 has not reached the predetermined loading mechanism operating position. Therefore, the loading mechanism does not operate and the loading gear 10 is stopped.

When the cassette holder 1 is further pushed in from this position, the first and second camshafts 1a, 1b
move within the first and second guide grooves 5a and 5b, respectively, in the directions indicated by arrows X in FIG. 3b.

For this reason, the third gear 6 engaged with the first camshaft 1a rotates in the direction of arrow θ in FIG.
The first gear 7 that meshes with the gear 6 rotates in the direction of the arrow ψ in FIG. 3b against the biasing force of the spring 24.

However, in this state, the cassette holder 1 has not yet reached the loading mechanism operating position, so the loading gear 10 is still in the stopped state.

When the cassette holder 1 is pushed further and reaches the loading mechanism operating position, a sensor (not shown) detects this and the loading mechanism is activated, causing the loading gear 10 to rotate in the direction of the arrow ψ in FIG. Start.

As the loading gear 10 rotates, the second gear 8 rotates in the direction of the arrow ψ in FIG. To be pushed, the first gear 7
rotates in the direction of the arrow ψ.

When the first gear 7 rotates in the direction of the arrow ψ, the first
Since the third gear 6 that engages with the gear 7 rotates in the direction of arrow θ, the first gear 6 that engages with the third gear 6 rotates in the direction of arrow θ.
The camshaft 1a moves in the first guide groove 5a in the direction of the arrow X in FIG.
The camshaft 1b similarly moves in the direction of the arrow X within the second guide groove 5b.

In this way, the cassette holder 1 moves in the horizontal direction within the cassette house guided by the first and second guide grooves 5a and 5b, then descends in the perpendicular direction and reaches a predetermined recording/playback position. The installation of the tape cassette 17 is completed.

<Problems to be solved by the invention> In the previously used cassette loading device described above, the pressing force applied to the tape cassette 17 is suddenly released during the process of pushing the cassette holder 1 toward the loading mechanism operating position. Then, due to the return biasing force of the spring 24, the first
The gear 7 rotates in the direction opposite to the arrow ψ in FIG. 3b, that is, in the counterclockwise direction.

The impact caused by the counterclockwise rotation of the first gear 7 causes the third gear 6 to rotate clockwise, and the tape cassette 17 in the cassette holder 1 is positioned relative to the cassette holder 1. causing misalignment.

If the loading mechanism is operated in this state, the cassette holder 1 will be stopped by the cassette house during movement, making it impossible to move to a predetermined recording/reproducing position.

The present invention was developed in view of the current state of cassette mounting devices as described above, and its purpose is to provide a cassette mounting device that can reliably prevent the tape cassette from shifting relative to the cassette holder during the mounting operation. It's about doing.

<Means for Solving the Problems> In order to achieve the above-mentioned object, the present invention is equipped with a magnetic recording/reproducing device, holds a tape cassette in which a magnetic tape is stored, and determines the ejection position and predetermined position of the tape cassette. A cassette mounting device comprising: a cassette holder movable between a recording and reproducing position; and a lever provided on the cassette holder and rotatable as the tape cassette is housed in the cassette holder. , a ratchet mechanism is provided for restricting movement of the cassette holder in the direction of the tape cassette unloading position at the loading mechanism operating point, and the ratchet mechanism is connected to a protrusion provided on the lever and a cassette house in which the cassette holder is housed. and a recess into which the above-mentioned protrusion can engage.

<Function> In the present invention, when the tape cassette is loaded, when the cassette holder is pushed into the cassette house close to the loading mechanism operating position, the protrusion of the lever of the cassette holder engages with the recess formed in the cassette house. .

The engagement between the protrusion and the recess restricts the movement of the cassette holder in the direction of the tape cassette removal position, and even if the pressing force on the tape cassette is suddenly released, the There is no displacement of the tape cassette in the cassette holder relative to the cassette holder due to the biasing force of the spring.

Therefore, when the cassette holder reaches the loading mechanism operating position, the loading mechanism transports the tape cassette to a predetermined recording/playback position without any displacement of the tape cassette.

When the cassette holder is driven back from the recording/playback position to the tape cassette insertion/removal position, the aforementioned protrusion moves avoiding the aforementioned recess, and the cassette holder is not locked. .

<Example> Hereinafter, an example of the present invention will be described in detail using FIGS. 1a, b, and c.

Here, FIG. 1a is an explanatory diagram showing the state immediately after the movement of the cassette holder in the embodiment of the present invention is started, and FIG. 1b is an explanatory diagram showing the state in which the cassette holder has reached the loading mechanism operating position in the embodiment of the present invention. FIG. 1c is an explanatory diagram showing the configuration of the main parts of the ratchet mechanism in the embodiment of the present invention. In FIGS. 1a, b, and c, the same parts as in FIGS. The same reference numerals are given.

As shown in FIGS. 1a, b, and c, in the embodiment of the present invention, a ratchet protrusion 25 is formed on the second lever 2, and a guide member 27 is formed on the cassette house.
The guide member 27 is provided with a ratchet recess 26 that engages with the ratchet projection 25.

When the cassette holder 1 is pushed into the vicinity of the loading mechanism operating position, the distance between the ratchet projection 25 and the guide member 27 is adjusted such that the ratchet projection 25 rides over the end of the guide member 27 and is located within the ratchet recess 26. and the shape of the ratchet recess 26 is set.

Furthermore, the ratchet protrusion 25 located within the ratchet recess 26 engages with the ratchet recess 26 to restrict movement of the cassette holder 1 in the direction of the tape cassette take-out position indicated by arrow Z in FIG. 1b. , the shape of the ratchet recess 26 is set.

Furthermore, when the cassette holder 1 is driven by the loading mechanism to return from a predetermined recording/playback position to a tape cassette insertion/removal position, the ratchet protrusion 25 does not engage with the ratchet recess 26 and the guide member 27 The shape of the ratchet recess 26 is set so that it moves along the upper edge.

In the embodiment of the present invention having such a configuration, the ratchet recess 26 formed in the guide member 27
and a ratchet protrusion 25 formed on the second lever 2 constitute a ratchet mechanism.

The operation of the embodiment of the present invention having the above-described configuration will be described next.

In the embodiment of the present invention, as shown in FIG. 1a, the cassette holder 1 is pushed and moved in the direction of the arrow X within the cassette house, and when the cassette holder 1 reaches the vicinity of the loading mechanism operating position, , the ratchet protrusion 25 formed on the second lever 2 passes over the end of the guide member 27 as shown by arrow M and becomes capable of engaging with the ratchet recess 26.

When the cassette holder 1 is pushed further and reaches a position where a predetermined sensor is activated and the loading mechanism is activated, even if the pressing force of the cassette holder 1 against the tape cassette is suddenly released, the ratchet protrusion 25 and The engagement with the recess 26 prevents the cassette holder 1 from moving in the direction opposite to the arrow X in FIG. No positional deviation will occur with respect to the cassette holder 1.

During the operation of the loading mechanism, the tape cassette in the cassette holder 1 is inserted into the first and second guide grooves 5 without being displaced as described above.
A and 5b, the recording/reproducing operation is performed by moving to a predetermined recording/reproducing position.

Furthermore, when the cassette holder 1 containing the tape cassette that has completed the recording/playback operation is returned to the tape cassette insertion/removal position, the ratchet protrusion 25 is moved in the direction indicated by the arrow N in FIGS. 1a and 1c. , moves along the upper edge of the guide member 27.

In this manner, during the return drive, the ratchet protrusion 25 and the ratchet recess 26 do not engage with each other, and the cassette holder 1 smoothly returns to the tape cassette insertion/removal position.

As mentioned above, according to the embodiment of the present invention, even if the pressing force on the cassette holder 1 is suddenly released during the process of pushing and moving the cassette holder 1 to the loading mechanism operating position within the cassette house,
The biasing force of the spring 24 prevents the tape cassette in the cassette holder 1 from being misaligned with respect to the cassette holder.

Further, the ratchet protrusion 25 can be formed at the same time as the second lever 2 is manufactured, and the ratchet recess 26 can be formed on the guide member 27 provided in the cassette house.
Since it is provided in the cassette house, it can be formed at the same time as the cassette house is manufactured, and there is no need to provide any separate member, so that the manufacturing cost does not increase.

<Effects of the invention> As explained in detail above, the cassette loading device of the present invention reliably prevents the tape cassette in the cassette holder from shifting relative to the cassette holder during the loading operation without increasing production costs. completed, the specified record of the cassette holder
Movement to the playback position can always be performed satisfactorily.

[Brief explanation of drawings]

FIG. 1a is an explanatory diagram showing the state immediately after the movement of the cassette holder in the embodiment of the present invention is started, and FIG. 1b is an explanatory diagram showing the state in which the cassette holder has reached the loading mechanism operating position in the embodiment of the present invention. , FIG. 1c is an explanatory diagram showing the configuration of the main part of the ratchet mechanism in the embodiment of the present invention, FIG. 2a,
Figures b and c are diagrams showing the configuration of a conventional cassette loading device. Figure 2a is a front view showing the tape cassette being placed in the cassette holder, and Figure 2b is a front view showing the tape cassette being placed in the cassette holder. FIG. 2c is a side view of the cassette holder showing the state in which the tape cassette has been inserted into the cassette holder; FIG. 3a is an explanatory view showing the state just before the cassette holder starts moving; FIG. 3b is an explanatory diagram showing the state immediately after the cassette holder starts moving, and FIG. 4 is a diagram illustrating a problem in the prior art. DESCRIPTION OF SYMBOLS 1... Cassette holder, 1a... First camshaft, 1b... Second camshaft, 2... Second lever, 3... First lever, 4... Spring,
5a...first guide groove, 5b...second guide groove,
6...Third gear, 6A...Protrusion, 6C...Elongated hole, 7...First gear, 7P...Protrusion, 8...Second gear, 8C...Elongated hole, 8P... Protrusion, 10...
...Loading gear, 17...Tape cassette,
18...stopper, 20...engaging claw, 23...
Shaft, 24... Spring, 25... Ratchet projection, 2
6... Ratchet recess, 27... Guide member.

Claims (1)

[Scope of utility model registration request] A cassette holder provided in a magnetic recording/reproducing apparatus, holding a tape cassette containing a magnetic tape, and movable between a tape cassette take-out position and a predetermined recording/reproducing position; In the cassette loading device, the lever is rotatable as the tape cassette is housed in the cassette holder, and the cassette holder is prevented from moving toward the tape cassette removal position at a loading mechanism operating point. A cassette mounting device characterized in that the ratchet mechanism comprises a protrusion provided on the lever and a recess formed in a cassette house in which the cassette holder is accommodated and into which the protrusion can engage. Device.