JPH0441473Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to a tape player such as a digital audio tape player that operates by pulling out a magnetic tape from a cassette half and winding it around a rotating head cylinder. The present invention relates to a tape loading device that can drive a tape pull-out guide pin.

[Background of the idea]

As shown in FIG. 5, in a magnetic recording/reproducing device such as a digital audio tape player, when a cassette half 5 is loaded onto the reel stands 2 and 3, the movable bases 6 and 7 located in section A are moved by the arrows. The rotary head cylinder 4 is moved along guides B and C shown in . At this time, the guide pins 6a, 6b and 7 on the moving bases 6, 7
a, 7b are magnetic tapes T in the cassette half 5.
is pulled out, and the magnetic tape T is wound around the rotary head cylinder 4 at a predetermined angle. Further, at the same time as this tape loading operation starts, the rotary head cylinder 4 starts to rotate. When the tape loading operation is completed, digital information is recorded and reproduced on the running magnetic tape T by the magnetic head in the rotary head cylinder 4.

FIGS. 6 to 8 show prior-application examples of the tape loading device for the above-mentioned tape player. In this prior application, the applicant of the present invention applied
No. 61-32627, the purpose of which is to construct a tape loading device with a simple structure.

As shown in FIG. 6, in this tape loading device, when the drive lever 15 provided on the chassis 1 is driven in the direction (a) by the power of a motor or the like, the drive lever 15 provided on the chassis 1 The inclined side of the guide groove 15a drives the drive pin 16, and the rotating lever 18 provided with this pin 16 drives the fulcrum pin 1.
7 in a counterclockwise direction. This rotational movement drives the switching lever 20 in the direction (b) via the connecting pin 19. As shown in detail in FIGS. 7 and 8, the chassis 1 is provided with a pair of toggle links 21 and 22. One toggle link 21 drives the left movable base 6, and the other toggle link 22 drives the right movable base 7. The base of the left toggle link 21 is the fulcrum pin 2 on the chassis 1.
It is rotatably supported by 3. Further, the base of the toggle link 21 is interlocked with a link drive arm 26 (which rotates around a fulcrum pin 25) via a gear 24. The connecting pin 27 provided on the link drive arm 26 connects the spring 2
The connecting pin 27 is pressed in the β direction by the urging member 29 connected to the switching lever 20, and the connecting pin 27 is pressed against the switching lever 20 by this elastic force. The base of the right toggle link 22 is rotatably supported by a fulcrum pin 30 on the chassis 1, and a connecting pin 31 provided at the base of the toggle link 22
is elastically pressed in the α direction by the urging member 32 urged by the spring 28, and the connecting pin 31 is pressed against the switching lever 20 by this elastic force.

Therefore, the switching lever 20 is moved by the movement of the drive lever 15 and the rotation lever 18.
When driven in the direction (b), the switching lever 20 drives the link drive arm 26 clockwise via the connecting pin 27, and also drives the base of the toggle link 22 clockwise via the connecting pin 31. the result,
Each toggle link 21 was contracted as shown in Figure 7.
and 22 are extended as shown in FIG. 8, and the moving bases 6 and 7 connected to the tips of the toggle links 21 and 22 are driven along guides B and C to both sides of the rotating head cylinder 4. .

Further, as shown in FIG. 6, positioning members 35 and 36 are provided on both sides of the rotary head cylinder 4, and in the final stage of the extension movement of the toggle links 21 and 22, the respective movable bases 6 and 7 are pressed against the positioning members 35 and 36, respectively. This pressing force is caused by the elastic force of the spring 28 acting on the connecting pin 2 through the biasing members 29 and 32.
It is exerted by acting on 7 and 31.

[Problem that the invention attempts to solve]

Since the tape loading device described above is mainly implemented in a small digital audio tape player or the like, the space for arranging each member on the chassis 1 is inevitably limited. On the other hand, in order to drive the movable bases 6 and 7 by the required distance using a simple link mechanism such as toggle links 21 and 22, the switching lever 20 must be moved a considerable distance in the direction (b). become longer.
Therefore, in order to ensure a sufficiently long movement distance of the switching lever 20 and to make the entire mechanism compact, the link ratio (l ₁ :
l ₂ ) (see FIG. 6) must be made large, and the amount of rotation of the drive pin 16 in the left-right direction in the figure must be made small. In the example of FIG. 6, this link ratio (l ₁ :l ₂ ) is set to about (1:2.5).

On the other hand, in the drive device for the movable bases 6 and 7 as shown in FIG. Member 35
and 36, but due to the pushing reaction force at this time, as shown in FIG.
1, the biasing members 29 and 32 are pushed in the direction opposite to the α and β directions (FIG. 8). That is, the movable bases 6 and 7 are pressed against the respective positioning members 35 and 36 by the biasing force of the spring 28. And in this final stroke, spring 2
8 comes to act on the switching lever 20 as a load.

Therefore, the switching lever 20 changes from the state shown in FIG.
When moving in the direction (b), a small driving force is required in the first stage of the stroke, but a large driving force is required in the final stroke when the moving bases 6 and 7 come into pressure contact with the positioning members 35 and 36. Furthermore, since the load acting on the connecting pin 16 is amplified by the link ratio (l ₁ :l ₂ ) of the rotating lever 18 mentioned above, a large load is applied to the drive lever 15 during the final stroke of the movable bases 6 and 7. It will work. The connecting pin 16 is driven by sliding on the inclined side of a guide groove 15a provided in the drive lever 15. Therefore, when the load acting on the drive lever 15 is large, the output of the motor decreases, or when the sliding conditions between the connecting pin 16 and the guide groove 15a deteriorate, the drive lever 15 and rotation Malfunction of the lever 18 is likely to occur.

This invention solves the above-mentioned conventional problems, and makes use of the simple structure in which the movable base is driven by a link mechanism, and minimizes the load acting on the drive lever at the latter stage of the movable base's movement stroke. To provide a tape loading device for a tape player that eliminates the risk of malfunctions by suppressing the number of malfunctions.

[Structure of the idea to solve the problem]

The present invention comprises a pair of reel stands on a chassis into which tape reels in a cassette half are loaded, a rotating head cylinder located away from the reel stands, and a rotating head cylinder located close to the reel stands. a pair of movable bases that are movably provided between the positioning members on both sides and are provided with guide pins for pulling out the tape, and a link mechanism that drives the movable bases and presses the movable bases against the positioning members. In a tape loading device for a tape player, the drive lever is linearly driven by a power source, and the drive lever is rotatably supported on the chassis. A rotary lever is provided, one end of the rotary lever is connected to the switching lever, and the other end of the rotary lever consists of two driving points and two inclined sides that are in sliding contact with the driving points. It is connected to the drive lever via a guide mechanism, and in this guide mechanism, the inclined side is aligned with respect to the drive point near the rotation center of the rotary lever before the movement of the movable base in the direction of the positioning member. It is characterized in that the inclined side comes into sliding contact with a driving point far from the center of rotation of the rotary lever at the latter stage of the movement stroke.

[Effect of invention]

In the present invention, before the operation of the drive lever driven by a motor etc., the inclined side slides with respect to the drive point close to the rotation center of the rotation lever, so the link of the rotation lever at this time The ratio is increased, and a short movement of the drive lever allows the pivot lever to be pivoted through a large angle, and the movable base can be driven by the required distance via the switching lever and the link mechanism. In addition, at the latter stage of the drive lever's stroke, the inclined side slides against the drive point far from the rotation center of the rotary lever, so the link ratio of the rotary lever can be reduced, and this small link ratio allows Now drives a moving base. Therefore, when the force required to drive the moving base increases, the load acting on the drive base is significantly smaller than before due to the low link ratio, and the drive that the drive base should exert is reduced. You will need less force. Therefore, malfunctions of the drive base and rotating lever are less likely to occur.

[Example of idea]

Embodiments of the present invention will be described below with reference to the drawings of FIGS. 1 to 5.

FIG. 1 is a plan view showing the tape loading device in a digital audio tape player in a non-loading state, that is, a state in which the magnetic tape is not pulled out from the cassette half, and FIG. 2 is a perspective view of the chassis in FIG. 3 is a perspective plan view showing the middle of the tape loading operation, FIG. 4 is a perspective plan view showing the tape loading completed state, and FIG. 5 is the tape running state when the tape loading is completed. FIG.

In FIG. 1, reference numeral 1 indicates a chassis. A supply reel stand 2 and a take-up reel stand 3 are provided on the chassis 1, and each is driven by a motor. In addition, each reel stand 2,
A rotary head cylinder 4 is located at a position away from 3.
The rotary head cylinder 4 is equipped with a plurality of rotary heads. The tape reels in the cassette half 5 loaded onto the chassis 1 are loaded onto each of the reel stands 2 and 3.

B ₁ and C ₁ are guide grooves formed in the chassis. A movable base 6 is slidably supported in one guide groove _B1 , and a movable base 7 is slidably supported in the other guide groove _C1 . A guide pin 6a and an inclined guide pin 6b are fixed on the movable base 6, and a guide pin 7a and an inclined guide pin 7b are similarly fixed on the movable base 7. Positioning members 35 and 36 are provided at the upper ends of the guide grooves B ₁ and C ₁ in the figure, that is, at the final stop positions of the movable bases 6 and 7 upon completion of tape loading.

The driving source for each of the moving bases 6 and 7 is a motor (not shown). A drive lever 41 is provided on the upper right side of the chassis 1 so as to be slidable in the vertical direction, and the drive lever 41 is driven by the motor. A guide groove 42 is formed in this drive lever 41, and two guide inclined sides 42a and 42b are formed in this guide groove 42. Reference numeral 43 is a rotating lever. This rotating lever 43
is rotatably supported with respect to the chassis 1 by a fulcrum pin 44. A pair of drive pins 45a and 45b are fixed to the upper end of the rotation lever 43 in the drawing. One drive pin 45a is inserted into the guide groove 42 of the drive lever 41 on the guide inclined side 42a.
and the other drive pin 45
b is inserted at a position opposite to the guide inclined side 42. A connecting pin 46 is provided at the lower end of the rotating lever 43 in the drawing, and this connecting pin 46 is connected to the right end of the switching lever 50. In the rotating lever 43, one driving pin 45a is provided at a distance (l ₃ ) close to the rotation center, and the other driving pin 45a is provided at a distance (l 3 ) close to the rotation center.
5b is placed at a far distance (l ₄ ) from the center of rotation. Further, the connecting pin 46 is located at a position (l ₅ ) with respect to the center of rotation of the rotating lever 43. Therefore,
The link ratio of the rotary lever 43 is a large ratio (l ₃ :l ₅ ) with respect to the drive pin 45a, and a small ratio (l ₄ :l ₅ ) with respect to the drive pin 45b.

The switching lever 50 is arranged on the back side of the chassis 1 and is connected to a pin 51 fixed to the chassis 1.
and 52 so that it can freely slide in the left and right directions in FIG. Further, a base link 53a forming a toggle link 53 is rotatably supported by the pin 51. A tip link 53c is connected to the tip of the base link 53a via a pin 53b, and this tip link 53c is connected to the movable base 6. Also, pin 5 on the right side
2, a base link 54a constituting a toggle link 54 is rotatably supported. A tip link 54c is connected to the tip of the base link 54a via a pin 54b.
The tip of c is connected to the movable base 7.

Further, as omitted in FIG. 1 and shown only in FIGS. 2 to 4, a holding lever 62 is rotatably supported at the left end of the switching lever 50 in the drawing by a pin 61. A spring 63 is applied between the holding lever 62 and the switching lever 50, and its elastic force forces the urging lever 62 in the counterclockwise direction (β direction). An L-shaped holding groove 62a is formed in the base link 53a of the toggle link 53.
A connecting pin 53d fixed to is inserted into the holding groove 62a. That is, the base link 53a of the toggle link 53 is connected to the chassis 1 by the pin 51.
It is rotatably supported by the switching lever 50 via the connecting pin 53d and the holding lever 62. Similarly, a holding lever 65 is rotatably supported by a pin 64 slightly to the right of the center of the switching lever 50 . This holding lever 65 and chassis 5
A spring 66 is hung between the
The holding lever 65 is biased clockwise (α direction) by the elastic force. Also, the holding lever 6
5 is formed with an L-shaped holding groove 65a, and a connecting pin 54d provided on the base link 54a of the toggle link 54 is held in the holding groove 65a. That is, the base link 54a of the toggle link 54 is rotatably supported by the chassis 1 via the pin 52, and is held by the switching lever 50 via the connecting pin 54d and the holding lever 65. become.

Next, the tape loading operation will be explained.

In the non-loading state shown in FIGS. 1 and 2, the drive lever 41 moves upward in the drawing, and the switching lever 20 moves to the left in the drawing. At this time, the connecting pin 53d provided on the base link 53a of the toggle link 53 is connected to the pin 53d on the chassis 1.
1, the base link 53a is rotated clockwise. In addition, toggle link 54
A connecting pin 54d provided on the base link 54a of
moves to the left side of the pin 52, and the base link 5
4a is rotating counterclockwise. Therefore,
Each of the toggle links 53 and 54 is in a contracted dogleg shape. In this state, the moving base 7
has moved to the lower end of the guide groove _C1 in the figure, and the guide pin 7a on the moving base 7 and the inclined guide pin 7
b is located at part A, and is stopped inside the magnetic tape T in the cassette half 5 loaded on the chassis 1. Similarly, the moving base 6 is connected to the guide groove B ₁
The guide pin 6a and the inclined guide pin 6b on the movable base 6 are also stopped inside the magnetic tape T in the cassette half 5.

Furthermore, in the non-loading state, the pinch roller 8 and the posts 9, 10 shown in FIG. 5 are also located within the cassette half 5 by a mechanism not shown.

When the cassette half 5 is loaded onto the chassis 1, the motor is started and the drive lever 41 is driven in the direction (a) by a mechanism such as a pinion and a rack. In the first stage of the stroke of the drive lever 41, the guide inclined side 42a on one side of the guide groove 42 provided in the drive lever 41 slides with respect to the drive pin 45a. During this time, the other guide inclined side 42b is away from the drive pin 45b and is exclusively used for the drive lever 4.
1 acts to drive only one drive pin 45a. At this time, the link ratio of the rotary lever 43 is (l ₃ :l ₅ ), and the operation of the drive lever 41 is transmitted to the switching lever 50 via the rotary lever 43 at this ratio. Since the distance (l ₃ ) between the drive pin 45a and the rotation center of the rotation lever 43 is short,
At this time, the link ratio (l ₃ :
l ₅ ) becomes a large ratio, and due to the short movement distance of the drive lever 41 in the direction (a), the switching lever 50 is
(b) Driven a long distance in direction.

By moving the switching lever 50 in the direction (b),
As shown in FIG. 3, the connecting pin 53d moves to the right with respect to the pin 51 on the chassis 1, and the base link 53a of the toggle link 53 is driven counterclockwise about the pin 51. Also, connecting pin 5
4d also moves to the right with respect to the pin 52,
The base link 54a of the toggle link 54 is connected to the pin 52.
It is driven clockwise around the center. Therefore, as the switching lever 50 moves in the direction (b), the toggle links 53 and 54 extend, and the movable base 6
is driven upward in the figure along the guide groove _B1 , and the movable base 7 is driven upward in the figure along the guide groove _C1 .

Then, the drive lever 41 moves to the position shown in FIG.
When driven to a position close to 6, the rotating lever 43
The drive pin 45a provided in the guide groove 42 comes off from the guide slope side 42a in the guide groove 42, and then the other guide slope side 42b in the guide groove 42 moves away from the drive pin 45.
It will slide against b. When the drive lever 41 is further driven in the direction (a) in this state, its linear movement is converted by the rotational movement of the rotary lever 43 via the drive pin 45b, and the switching lever 50 is further moved in the direction (b). driven to. Thereafter, the switching lever 50 is driven exclusively by the drive pin 45b until the tape loading is completed as shown in FIG. Since the distance (l ₄ ) between the drive pin 45b and the center of rotation of the rotation lever 43 is longer than that of the drive pin 45a, the link ratio (l _{4 )} of the rotation lever 43 from FIG. 3 to FIG. l ₅ ) is reduced to about (1:1.3). Therefore, the driving force of the drive lever 41 required to rotate the drive pin 45b can be small. In the final stage of the tape loading operation shown in FIG. 4, the moving base 6 contacts the positioning member 35, and even after the moving base 7 contacts the positioning member 36, the switching lever 50 is still driven in the direction (b). be done. At this time, the reaction force acting on the toggle link 53 causes the connecting pin 53d to slightly rotate the biasing member 62 clockwise, and the spring 63
The movable base 6 is brought into pressure contact with the positioning member 35 by the force. Similarly, the reaction force acting on the other toggle link 54 causes the connecting pin 54d to slightly rotate the biasing member 65 counterclockwise, and the force of the spring 66 presses the movable base 7 against the positioning member 36. The state will be as follows. Therefore,
In this final stroke, the forces of the springs 63 and 66 act as a load on the switching lever 50, and the driving force required to move the switching lever 50 in the direction (b) increases. However, as mentioned above,
In this final stroke, the drive pin 45b contributes to driving the rotary lever 43 and the switching lever 50, and the link ratio of the rotary lever 43 (l ₄ :l ₅ )
has a small ratio, so the drive pin 45b
This means that the load acting on it will not be amplified that much. Therefore, even if the rotational driving force for the drive pin 45a is small, the force for driving the switching lever 50 can be sufficiently exerted. Therefore, the driving force required by the driving lever 41 is also small.
Malfunctions of the drive lever 41 and the rotation lever 43 are less likely to occur.

Through the above series of operations, the movable bases 6 and 7 move along the guide grooves _B1 and _C1 , but during this time,
Guide pin 6a and inclined guide pin 6b on moving base 6, and guide pin 7 on moving base 7
a and the inclined guide pin 7b pull out the magnetic tape T from the cassette half 5, and as shown in FIG. 5, the magnetic tape T is wound around the rotary head cylinder 4 at a predetermined angle. Furthermore, by a mechanism not shown, the pinch roller 8 and the posts 9 and 10 are also moved from the section A, and the magnetic tape T is pulled out to a predetermined path. Then, the pinch roller 8 presses the magnetic tape T against the capstan 11, and the rotational force of the capstan 11 causes the magnetic tape T to be fed at a constant speed.

In the illustrated embodiment, a guide groove 42 is provided on the drive lever 41 side as a guide mechanism provided between the drive lever 41 and the rotating lever 43.
Pins 45a and 4 that serve as driving points on the rotating lever 43 side
5b, but on the contrary, the rotary lever 43
It is also possible to provide a guide groove on the side and a pair of pins serving as a driving point on the drive lever 44 side. In this case, at the beginning of the stroke of the drive lever 41 in the direction (a), one of the drive points provided on the drive lever 41 that is closer to the center of rotation of the rotation lever 43 is located within the guide groove of the rotation lever 43. At the latter stage of the stroke, the drive point provided on the drive lever 41 that is far from the center of rotation of the rotary lever comes to slide into the guide groove of the rotary lever 43.

[Effect of idea]

As described above, according to the present invention, as a guide mechanism provided between the drive lever and the rotation lever, a drive point close to the rotation center of the rotation lever and a drive point far from the rotation center are provided. Use a drive point close to the center of rotation during the stroke, and use a drive point far from the center of rotation during later strokes with heavy loads.
Since the link ratio of the rotary lever is used depending on the stroke, the movable lever can be driven by the required distance with a short stroke of the drive lever. Furthermore, since the load on the drive lever is light from start to finish, there is no risk of malfunction.

[Brief explanation of the drawing]

1 to 5 show a digital audio tape player as an embodiment of the present invention, FIG. 1 is a plan view showing a non-loading state of the tape loading device of the tape player, and FIG. FIG. 3 is a perspective plan view showing the chassis in the state shown in the figure, FIG. 3 is a perspective plan view showing the middle of the tape loading operation, FIG. 6 is a plan view showing the tape loading device of the digital audio tape player of the prior application; FIGS. 7 and 8 are the tape shown in FIG. 6. FIG. 3 is a partial plan view showing each operation of the loading device. 1... Seat, 2, 3... Reel stand, 4...
Rotating head cylinder, 5...cassette half,
6, 7...Moving base, 6a, 6b, 7a, 7b
... Guide pin for tape drawer, 41 ... Drive lever, 42 ... Guide groove, 42a, 42b ... Guide slope side, 43 ... Rotation lever, 44 ... Rotation center of rotation lever, 45a ... Rotation A driving point (driving pin) close to the rotation center of the rotating lever, 45b...a driving point (driving pin) far from the rotation center of the rotating lever,
50...Switching lever, 53, 54...Link mechanism that drives the moving base, 63, 66...Spring that acts in the final stroke of the moving base, _B1 , _C1
...Guide groove, T...Magnetic tape.

Claims (1)

[Scope of utility model registration request] a pair of reel stands on the chassis into which the tape reels in the cassette halves are loaded; a rotary head cylinder located apart from the reel stands;
a pair of movable bases that are movably provided between a position approaching the reel stand and positioning members on both sides of the rotary head cylinder and are provided with guide pins for drawing out the tape; In a tape loading device for a tape player that is provided with a link mechanism that presses a movable base against a positioning member and a switching lever that drives this link mechanism, a tape loading device that is linearly driven by a power source is mounted on the chassis. A drive lever that is rotatably supported and a rotating lever that is rotatably supported are provided, one end of the rotating lever is connected to the switching lever, and the other end of the rotating lever is connected to two driving points and this driving point. The drive lever is connected to the drive lever via a guide mechanism consisting of two inclined sides in sliding contact with the drive lever, and in this guide mechanism, the center of rotation of the pivot lever is 1. A tape loading device for a tape player, wherein the inclined side slides into contact with a driving point near the center of rotation of the rotary lever, and the inclined side slides into contact with a driving point far from the center of rotation of the rotary lever at a later stage of the movement stroke.