JPH0633567Y2 - DAT cassette erroneous insertion prevention mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Outline] A DAT cassette erroneous insertion prevention mechanism, which has a side portion having a length substantially equal to the stroke of a slider included in the cassette and having a side surface parallel to the insertion direction of the cassette. A cassette receiving lever having a recessed portion and a bent portion abutting on the front surface of the cassette, the movement of which is restricted in the insertion direction, and a cassette holder having a claw for engaging the slider to open the slider and carrying the cassette. , A lock lever pivotally attached to the cassette holder, a roller attached to the lock lever and a roller that comes into contact with a concave portion on the side of the cassette receiving lever until the slider is almost opened by the bias force, and a roller in the insertion direction. And a cam groove for guiding in a direction having a component in the direction of contacting the side portion, the slider is opened with a sufficient stroke. Beginning is to prevent reverse insertion of the cassette as a structure to move the cassette holder.

[Industrial application field]

The present invention relates to a cassette erroneous insertion prevention mechanism for a rotary head type DAT (digital audio tape recorder).

DAT realizes high performance by digitizing the recording method while maintaining the advantages of conventional compact cassettes such as simplicity and versatility. The merits of digitization have already been widely recognized in CDs (compact discs), which have become popular in recent years, and it is expected that this DAT will spread rapidly in the same way as CDs or more. To be done.

This DAT has two types, a rotary head type and a fixed head type, but only the rotary head type is practically used at present. The present invention refers to a mechanism for preventing erroneous insertion of a DAT cassette used in such a rotary head type DAT.

[Conventional technology]

FIG. 4 is a diagram for explaining the structure of the DAT cassette described above.

As shown in FIG. 4 (a), the DAT cassette 1 is provided with a lid 2 as a front lid that can be opened and closed on the front surface of the cassette, and a slider 3 is provided on the bottom surface of the cassette as a bottom lid that can move in the front-rear direction of the cassette. It is provided. The lid 2 and the slider 3 are urged by a spring (not shown) in a direction to close the opening when no external force is applied.

The slider 3 has two holes 3a, 3b and two lock grooves 3g, 3h, and each of the lock grooves 3g, 3h has two lock holes 3c, 3d, 3e, 3f. When the cassette 1 is outside the apparatus, the slider 3 has lock holes 3c and 3e locked to lock claws 1a provided on the main body of the cassette 1 so that the slider 3 does not open. The hub holes 1b and 1c provided are covered by the slider 3. The lid 2 is not opened when the slider 3 is closed. 1d is the bottom surface of the cassette 1 inside the slider 3.

When the DAT cassette 1 configured as described above is inserted into the apparatus, the lock claws 1a and the lock holes 3c and 3e are first disengaged from each other, and as shown in FIG. 3 is opened, and the bottom surface 1d and the insertion hole 1e of the guide roller are exposed on the lid 2 side of the cassette 1. When the slider 3 is completely opened, the lock holes 3d and 3f are locked by the lock claws 1a and cannot be closed. In this state, the holes 3a and 3b overlap the hub holes 1b and 1c of the cassette 1. Then, cassette 1
The lid 2 is opened as shown in FIG. 4 (c), and when the cassette 1 is moved downward, the tape 4 is pulled out by the guide roller (not shown) inserted into the insertion hole 1e into a substantially M-shape to rotate the rotary head. (Not shown).

When ejecting the cassette 1 from the inside of the device, the lid 2 is closed by the spring force when the cassette 1 is moved upward, and the lock hole 3 is taken out when the cassette 1 is taken out from the device.
When the engagement between d and 3f and the lock claw 1a is released, the slider 3 is also automatically closed by the spring force.

[Problems to be solved by the device]

The DAT cassette in which the slider 3 and the lid 2 are not opened is close to a rectangular parallelepiped in appearance as shown in FIG. 4 (a),
If not checked carefully, it is difficult to distinguish the front-back direction and the front and back, and there is a risk that the front-back or top-bottom may be inserted incorrectly.

Therefore, the slot-in loading mechanism has a structure in which it is played normally only during regular insertion, and cannot be inserted during other wrong insertion.
It is essential.

[Means for Solving the Problems]

FIG. 1 is a view for explaining an erroneous insertion preventing mechanism of a DAT cassette of the present invention.

In the figure, a cassette receiving lever 201 is a side portion having a length substantially equal to a stroke 1 of a slider 3 provided in the cassette 1 and having a side surface parallel to a cassette insertion direction A.
It has a recess 21, a recess 22 continuing from the side, and a bent portion 23 that comes into contact with the front surface of the main body of the cassette 1 when the cassette 1 is inserted, and its movement in the insertion direction A is restricted. The cassette holder 301 engages with the slider 3 and has a claw 31 for opening the slider 3,
A bead 32 that engages with the lock claw 1a provided on the slider 3.
And carrying the inserted cassette 1. The lock lever 40 is pivotally attached to the cassette holder 301, and the lock lever 40 is provided with a roller 41.
Contacts the side portion 21 of the cassette receiving lever 201 until the slider 3 is almost opened, and then contacts the recess 22. Cam groove 5
01 guides the roller 41 in a direction having a component in the insertion direction and a component in the direction of contacting the side portion 21.

[Action]

When the cassette 1 is inserted, first, the front surface thereof comes into contact with the bent portion 23 of the cassette receiving lever 201 to start pushing the cassette receiving lever 201. At this time, even if the cassette holder 3101 carrying the cassette 1 tries to move together with the cassette 1 in the inserting direction, the roller 41 attached to the lock lever 40 axially mounted then becomes parallel to the inserting direction along the side portion 21. It will move and cannot move because the movement is prevented by the cam groove 501. Cassette holder 301
The claw 31 included in the cassette 3 is the slider 3 included in the cassette 1.
Since the slider 3 cannot move because it is provided to engage with, the lock claw 1a (Fig. 4) is pushed up by the bead 32, so that the slider 3 can be opened. The main body and the cassette receiving lever 201 that contacts the main body move in the insertion direction A. When the slider 3 is almost opened, the cassette receiving lever 201 reaches the position shown by the chain double-dashed line in the figure, and thereafter the roller 41 engages with the recess 22 of the cassette receiving lever 201. In this state, the roller 41 can also move to the left in the figure,
The roller 41 can move in the upper left direction in the figure along the cam groove 501, and therefore, the cassette holder 30 can move in the inserting direction, so that even if the slider 3 is completely opened, the entire cassette 1 is inserted in the inserting direction. It is possible to move to.

The above is the case where the cassette 1 is inserted in the correct direction, and if the insertion direction is wrong, the cassette receiving lever 201 cannot move because the slider mechanism is not at the expected position, and the roller 41 causes the cassette receiving lever 201 to move. It cannot be disengaged from the state in which it is engaged with the side portion 21, and as a result, erroneous insertion is prevented.

〔Example〕

FIG. 2 is a schematic view showing an example in which the erroneous insertion prevention mechanism of the DAT cassette of the present invention is applied to a digital audio tape (DAT) player. In the figure, the player main body 101 is shown for each component that constitutes the DAT player unit 100.
Only the part that is visible when you take out only the DAT player unit 100 from the
An overview of 101 is drawn. The DAT cassette 1 of FIG. 4 is inserted from the direction of FIG. 2A with the surface of the lid 2 facing forward and the surface of the slider 3 facing down.

The cassette receiving lever 201 shown in FIG. 1 is realized as a discharging lever 20 which also serves to push out the cassette in the present embodiment, and the recess 22 thereof is realized by an inclined portion 28 and a flat portion 27, which will be shown and described in detail later. To be done. The cassette holder 301 is realized by the elevator holder 30 that is involved in not only the inserting / discharging operation but also the vertical movement after insertion. Cam groove
501 is realized by a part of the slit 50 provided in the sub chassis 51. In addition, the same reference numerals are given to the components and elements having the same roles and the same names as those in FIG.

FIG. 3A shows the cassette 1 in the apparatus shown in FIG.
It is the top view (column (A)) and the side view from the left (column (B)) showing the state just before insertion. FIG. 3B shows the state immediately after the cassette 1 is pushed further into the state shown in FIG. 3A and the slider 3 is opened, and FIG. 3C shows the cassette 1.
The state immediately after the completion of the discharge is shown.

First, each component will be described individually. The elevator holder 30 has a height and width slightly larger than that of the cassette 1 so as to receive the cassette 1, and has a substantially rectangular parallelepiped shape in which a surface on the cassette receiving side and a surface corresponding thereto are open. A pair of beads 32 for releasing the lock of the slider by pushing up the lock claw 1a (Fig. 4) provided on the cassette 1 are provided on the bottom surface, and the pair of beads 32 is provided on the opposite side of the receiving side to the cassette 1. A pair of claws 31 for engaging the slider 3 to open the slider 3. On the outer sides of both sides, there are three pairs of short shafts 33a,
33b and 33c are one body. This short shaft 33a, 33b, 33c
Are three pairs of L-shaped slits 10 provided on the sub chassis 51.
The elevator holder 30 is guided by 0a, 100b, 100c, and further, the shaft 33b is pressed by the spring 102 of the elevator drive mechanism 101 in the insertion direction of the cassette 1 via the lever 103. The movement is regulated in the vertical direction, and thereafter, the movement is regulated in the direction orthogonal to that, that is, in the leftward direction in the column (B).

A pair of cassette crimping levers 61 are mounted on shafts 62 on both side surfaces of the elevator holder 30, and one end of the cassette holder levers 1 is mounted on the shaft 62.
A pair of flexible rollers 60 are pivotally mounted. The cassette pressure lever 61 is biased to the left in the (B) column by the spring 64, and when the cassette 1 is inserted into the elevator holder 30, the roller 60 presses the cassette 1 against the bottom surface of the elevator holder 30 by this biasing force. The bead 32 pushes up the lock claw 1a provided in the cassette 1 while holding the No. 1.

On the top surface of the elevator holder 30, a dharma-shaped lock lever is attached.
A shaft 40 is pivotally mounted on a shaft 44, and is biased by a spring 42 in a counterclockwise direction in the column (A).
A roller 41 is axially attached to the tip of the lock lever 40, and the movement of the roller 41 is restricted by an L-shaped elongated slit 50 provided in the sub chassis 51.

The ejection lever 20 is suspended on the sub-chassis 51 by a pair of eyelet-shaped members 29 fitted in the elongated holes 52 provided in the sub-chassis 51, and slides in the insertion direction or the ejection direction, that is, the vertical direction of column (A). . On the side of the lock lever 40, the side portion 21 parallel to the sliding direction thereof and the inclined portion 28 that follows the side portion 21 are provided.
It has a flat portion 27 and a projecting portion 26 which are at positions retracted from 21. The roller 41 on the lock lever 40 first engages the side portion 21, and as the discharge lever 20 moves in the insertion direction, the inclined portion 28, the flat portion 27, and the protruding portion 26 are engaged in this order. Further, there is a bent portion 23, which is in contact with the front portion of the inserted cassette 1, above the ejection lever 20 in the (A) column, so that the cassette 1 is inserted and pushed by the front portion of the cassette 1 in the insertion direction. Slide to.

The reversing spring 70 has one end fixed to the sub-chassis 51 and the other end fixed to the ejection lever 20, and biases the two in a direction of separating them. That is, the ejection lever 20
Is biased in the ejecting direction of the cassette 1, that is, downward in the figure, while the ejecting lever 20 is in the position shown in FIG. 3A.
Moves in the insertion direction and exceeds a certain position, it is biased in the opposite direction.

The push-out lever drive link 82 can rotate about a shaft 81, is biased counterclockwise in the figure by a spring 89, and its tip portion moves along the slit 50 in the insertion direction and the discharge direction. The whole is rotated by being pushed by 41.

First protrusion lever 83 is a protrusion lever drive link
The shaft is coaxially attached to 82, and rotates counterclockwise at a contact point 88 with the push-out lever drive link 82, and is pushed by the push-out lever drive link 82 and rotates counterclockwise with the same angular deviation, while It is biased in the opposite direction by a spring (not shown). A flexible roller 91 is attached to the tip of the first protrusion lever 83.

The second protrusion lever 85 is rotatable about a shaft 84, and a cam groove 87 is provided at the substantially central portion thereof.
The cam groove 87 is a pin 86 provided on the first protrusion lever 83.
Is loosely fitted. A flexible roller 92 is also attached to the tip of the second protrusion lever 85.

Next, the inserting operation of the cassette 1 in the apparatus of this embodiment will be described. In the state shown in FIG. 3A, the cassette 1 is inserted into the frame of the elevator holder 30 and is pressed against the bottom surface of the elevator holder 30 by the pair of rollers 60 by the biasing force of the spring 64. If the elevator holder 30 tries to move in the insertion direction (upward in the drawing), the roller 41 at the tip of the lock lever 40 pivotally supported on the upper portion of the elevator holder 30 is slit 50.
The movement is restricted to the inclined portion of the extended portion of the L-shape and tries to move to the side of the discharge lever 20, and this action is stopped at the side portion 21 of the discharge lever 20 so that it cannot move eventually. When the cassette 1 is further pushed in this state, the lock claw 1a of the cassette 1 is pushed up by the bead 32 and the slide 3 can be opened. Then, the claw 31 provided on the bottom surface of the elevator holder 30 abuts on the front portion of the slider 3, and at the same time, the front portion of the cassette body abuts on the bent portion 23 of the ejection lever 20. When pushed further, the slider 3 is stopped by the claw 31 of the elevator holder 30, and the main body side pushes the discharge lever 20 to proceed, thus opening the slider 3 and reaching the state of FIG. 3B.

In this state, the roller 41 comes into contact with the inclined portion 28 from the side portion 21 of the discharge lever 20. When this happens Laura 41
Can move in the insertion direction at the same time as the movement toward the discharge lever 20, that is, the lock lever 40 can rotate in the counterclockwise direction, so that the elevator holder 30 can move in the insertion direction, that is, upward in the drawing. Like In other words, the elevator holder 30 cannot move unless the slide mechanism having such an orientation is provided in the cassette, and erroneous insertion is prevented. Almost at the same time when the slider is completely opened, a part of the switch lever 72 is pushed by the inclined portion on the upper left side of the discharge lever 20 to rotate clockwise, the lever of the switch 73 is pushed, the switch is turned on, and the motor starts to rotate. The rotation of the motor is transmitted to the elevator holder 30 by the elevator drive mechanism 101 via a reduction mechanism (not shown), and the elevator holder 30 is driven in the insertion direction. Further, since the roller 41 comes into contact with the inclined portion 28 of the ejection lever 20 and pushes the same, the ejection lever 20 or the entire cassette 1 cannot be pushed back by the reversing spring 70 even if the pushing force is removed. Disappear. Therefore, the force with which the roller 60 presses the cassette 1 may be such that the cassette 1 does not slide down due to gravity, and the mechanism shown in the figure is sufficient.

After that, the elevator holder 30 further advances in the insertion direction,
When the roller 41 comes close to the bulge 53 of the slit 50, the biasing force of the reversing spring 70 acts in the opposite direction, and the discharging lever
Pull 20 away from cassette 1. Then, the elevator drive mechanism 101 starts the descent of the elevator holder 30, the lid 2 of the cassette 1 is opened, and the cassette 1 is loaded at the recording / reproducing position. Further, when the elevator holder 30 starts to descend, the roller 41 descends to release the engagement of the push-out lever drive link 82, and the push-out lever drive link 82 moves to the position shown in FIG. Returning to, the positional relationship between the roller 41 and the ejection lever drive link 82 is reversed.

Next, the ejection operation of the cassette 1 will be described. The elevator holder 30 is lifted from the recording / reproducing position by the elevator drive mechanism 101, the lid 2 is closed, and then driven in the ejection direction opposite to the insertion direction. At this time, as described above, the positional relationship between the push-out lever drive link 82 and the roller 41 is reversed, and therefore the roll-out lever drive link 82 is pushed as the roller 41 moves in the discharging direction, that is, in the lower direction of the figure. Rotate counterclockwise. The first protrusion lever 83 is pushed by the protrusion driving link 82 at the contact point 88 and similarly rotates counterclockwise about the shaft 81. Second protrusion lever
85 is pivotally supported by a shaft 84, and a pin 86 provided on the first protrusion lever 83 is loosely fitted in a cam groove 87 provided on the second protrusion lever 85 with the first protrusion lever 83. By doing so, they are engaged with each other, so that they rotate clockwise. First
Flexible rollers 91 and 92 are provided at the tips of the second ejection levers 83 and 85, and the cassette 1 is pushed out as the levers rotate.

FIG. 3C shows the state immediately after the ejection is completed and the positional relationship between the roller 41 and the ejection lever drive link 82 is reversed and the cassette is ejected.

However, the roller 41, the elevator holder 30, and the discharge lever 20 are shown in a state where they have further advanced to the position shown in FIG. 3A. The distance from the point where the rollers 91 and 92 contact the cassette 1 to the respective rotary shafts 81 and 84 is set sufficiently larger than the distance from the engagement point between the roller 41 and the ejection lever drive link 82 to the shaft 81. Therefore, the discharge amount of the cassette 1 is sufficiently larger than the movement amount of the roller 41. Therefore, when the slider 3 is inserted, it can be discharged to a position where the slider 3 is completely closed beyond the position where the moheta starts to move. Moreover, the cassette 1 is pushed before the reverse spring 70 is reversed and the cassette 1 is pushed through the ejection lever 20.
Is discharged, the reversing spring 70 does not participate in the discharge of the cassette 1.

The shape of the cam groove 87 can be obtained by drawing so that the positions of the left and right rollers will be the same at the time when there is a final width when the cassette 1 is discharged. In this case, it is preferable from the standpoint of the operating angle of the cam and the driving force of the motor to have a shape in which only the first protrusion lever 83 moves at the start of discharging.

[Effect of device]

As described above, according to the present invention, the erroneous insertion prevention mechanism that performs the insertion operation normally only when the DAT cassette is correctly inserted and never performs the insertion operation when the DAT cassette is inserted incorrectly Provided by.

[Brief description of drawings]

 FIG. 1 is a diagram for explaining the principle of the present invention, FIG. 2 is a schematic diagram of an embodiment of the present invention, FIG. 3A is a diagram showing a state immediately before insertion of a cassette, and FIG. Fig. 3C is a diagram showing the state when the cassette is completely discharged, and Fig. 4 is a diagram showing a commercially available DAT cassette. In the figure, 1 ... Cassette, 3 ... Slider, 21 ... Side part, 22 ... Recessed part, 23 ... Bent part, 31 ... Claw, 32 ... Bead, 40 ... Lock lever 41 ... Roller, 201 …… Cassette receiving lever, 301 …… Cassette holder, 501 …… Cam groove.

Claims (1)

[Scope of utility model registration request] 1. A cassette (1) has a length (l ') substantially equal to a stroke (l) of a slider (3) and a side surface parallel to an inserting direction (A) of the cassette (1). Side part (21) and recess (22) following the side part (21)
And a cassette receiving lever (201) having a bent portion (23) that abuts on the front surface of the cassette (1) and the movement of which is restricted in the insertion direction (A), and the cassette (1). A bead (32) for releasing the lock by pushing the lock claw (1a), and the slider (3)
A cassette holder (301) having a claw (31) for engaging with the cassette (1), and a lock lever (4) axially attached to the cassette holder (301).
0) attached to the lock lever (40) to the side portion (21) of the cassette receiving lever (201) until the slider (3) is almost opened, and then to the concave portion (22). A roller (41) that abuts, and a cam groove (501) that guides the roller (41) in a direction having a component in an inserting direction and a component in a direction abutting on the side portion (21). A mechanism that prevents erroneous insertion of DAT cassette.