JPH01258256A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To simplify the structure of a tape loading mechanism part by providing a means for biasing main- and sub-levers to be rotated in their directions outside a prescribed angle range, so as to be against themselves in rotation in the most area of the prescribed angle range. CONSTITUTION:When a driving gear 28 is rotated counterclockwise, the main- and sub-levers 26 and 27 comes to a standstill under the state of drawing each other by a tension spring 34. And, when the driving gear 28 is rotated clockwise, the main-lever 26 engaged with a gear 28T and a gear 26T and the sub-lever 27 engaged with a gear 26t and a gear 27t are rotated in the opposite direction to each other, and the driving gear 28 is rotated against a bias force of the tension spring 34 to progress the tape loading operation. When the tension spring 34 is beyond a dead position of its max. extension, the driving gear 28 and the main-lever 26 are released from their engagement, and the bias force of the tension spring 34 works in the direction of helping the rotation of the main- and sub-levers 26 and 27, and hence the main- and sub-levers 26 and 27 continue their rotations to complete the tape loading operation.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a magnetic recording/reproducing apparatus, and particularly to a magnetic recording/reproducing apparatus having features in a tape loading mechanism section.

<Prior Art> FIG. 6 is a plan view showing the configuration of a tape loading mechanism of a conventional magnetic recording/reproducing device. Guide grooves 4a are formed to face each other, and a stopper 4c is formed to protrude from the chassis 4 at the end of each guide groove 4a on the head cylinder 5 side.

Further, a fixed head 6 and a tape guide 9 are attached to the side of one guide groove 4a of the chassis 4, and a pinch roller arm 12 is attached so as to be rotatable around a support 4b provided on the chassis 4. Pinch roller arm 12
A pinch roller 11 is rotatably attached to the end of the roller, and a capstan 10 is provided at a position facing the pinch roller 11. An erasing head 7 and a tape guide 8 are attached to the side of the other guide groove 4a of the chassis 4.

Further, in FIG. 6, a pair of reel hubs 3 on which magnetic tape l is wound are housed in the cassette pack 2, and a first movable body 13 and a second movable body 14 are inserted into the aforementioned guide groove 4a. Guide posts 13a and 14a for drawing out the tape are led out from these movable bodies 13 and 14 so as to be movably engaged with each other, respectively, and project onto the chassis 4.

FIG. 7 is a rear view of the main part of FIG. 6, and FIG. 8 is a cross-sectional view of the main part of FIG. or fixed, support 4f
A cam gear 24 is rotatably attached to the column 4e, and a main gear 21 and a follower gear 22 are rotatably attached to the column 4e and the column 4d, respectively. The cam gear 24 is formed with an arc-shaped cam groove 24a with one end wrapped around the center, and a fan-shaped gear 23 is engaged with the cam groove 24a via a boss 23a and is rotatable around the support 4g. is provided in mesh with the main gear 21, and the main gear 21 and the subordinate gear 22 are in mesh with each other.

FIG. 9 is a detailed view of the main part showing the configuration of the main gear part, and as shown in FIG. 9 and FIG. 8, the main gear 21 is
A lever 15 is rotatably attached to the chassis 4 side of the lever 15, and the main gear 2
A protrusion 21a protruding from the lower surface of 1 is inserted. Further, the lever 15 is provided with a spring hook 15a at a position facing the elongated hole 15b, and a spring 25 is stretched between the spring hook 15a and the protrusion 21a of the main gear 21.

In this way, the spring force of the spring 25 causes the protrusion 21a to
is pressed against the end of the elongated hole 15b of the lever 15, and is biased in the direction of arrow a shown in FIG.

A joint 19 is rotatably attached to the end of the lever 15 via a pin 17 with respect to the lever 15, and a movable body is movably engaged with the joint 19 in the aforementioned guide groove 4a. 14 is rotatably attached.

Although not shown, the following gear 22, lever 16, joint 20, and moving body 13 are also similar to the main gear 21, lever 15, and
, the joint 19 and the movable body 14 are assembled to each other in exactly the same manner.

When the magnetic tape 1 is pulled out from the cassette pack 2 and attached to the head cylinder 5, the cam gear 24 is driven by a motor (not shown) and rotates clockwise in FIG. Boss 2 that engages with 24a
3a causes the fan-shaped gear 23 to rotate clockwise in FIG. 7 about the support 4g. The main gear 21 meshes with the sector gear 23 by clockwise rotation of the sector gear 23.
rotates counterclockwise, and the driven gear 22 that meshes with the main gear 21 rotates clockwise.

As mentioned above, since the lever 15 is attached to the main gear 21 and the lever 16 is attached to the follower gear 22 via the spring 25, the rotation of the sector gear 23 causes the lever 15 to move counterclockwise. , the levers 16 rotate clockwise, and the movable bodies 13, 14 connected to these levers via joints 19, 20 move in the guide groove a toward the stopper 4C.

When the movable bodies 13 and 14 move in this manner, the magnetic tape 1 is pulled out from the cassette pack 2 by the guide posts 13a and 14a, carried in the direction of the head cylinder 5, and finally wound around the head cylinder 5. Ru. FIG. 10 shows the state in which the magnetic tape 1 is wound around the head cylinder 5, and FIG. 11 is a back view showing this state. and is pressed toward the stopper 4c. As shown in FIG. 11, after the main gear 21 and the subordinate gear 22 have rotated to the position where the movable body 13.14 comes into contact with the stopper 4c, the biasing force of the spring 25 causes the main gear 21 and the subordinate gear 22 to rotate at a predetermined angle. A cam groove 24a is formed to allow rotation by B. For this reason, lever 15.16
is biased toward the head cylinder 5 by a spring 25,
The moving body 13.14 is pressed against the stop 4c via the joint 19.20.

In this way, the magnetic tape 1 is inserted from inside the cassette pack 2.
is pulled out, and this magnetic tape 1 is wound around the head cylinder 5. After the magnetic tape 1 is wound around the head cylinder 5, operations such as pressing the pinch roller 11 onto the capstan 10 are performed using the boss 23a of the fan-shaped gear 23.
This is done by rotating the cam gear 24 within an angular range within the same diameter of the cam groove 24a.

Further, in order to wind the magnetic tape 1 into the cassette pack 2, the cam gear 24 is rotated counterclockwise by a motor (not shown), the reverse operation to the above is performed, and the tape winding means (not shown) Tape 1 to cassette pack 2
Roll it up inside.

<Problems to be Solved by the Invention> In the conventional magnetic recording/reproducing device described above, the main gear 21 and the lever 15 are separate bodies, and the lever 15 is different from the main gear 21.
are connected by a spring 25. Similarly, the driven gear 22 and the lever 16 are separate bodies, and the lever 16 is different from the driven gear 22.
are connected by a spring 25.

Further, the cam gear 24 and the sector gear 23 are different from each other.
They are connected to each other by a cam groove 24a formed in the fan gear 23 and a boss 23a provided in the sector gear 23.

As described above, the tape loading mechanism of the conventional magnetic recording/reproducing device has a large number of components and has a complicated structure.

Furthermore, in the conventional magnetic recording and reproducing apparatus, the boss 23a of the fan-shaped gear 23 is connected to the cam when the pinch roller arm 11 is pressed against the capstan 10 after the magnetic tape 1 is wound around the head cylinder 5. This is done in an angular range located within the same diameter of the groove 24a. In this case, there are disadvantages in that the angular range within the same diameter can be set too large and the rotation range of the cam gear 24 cannot be widened. Further, since the spring force of the spring 25 provided between the lever 15 and the main gear 21 is transmitted to the cam i1$24a via the boss 23a, the cam groove 24a is easily worn out and the other members to be driven are Strength is required.

The present invention has been made based on the current state of magnetic recording and reproducing devices as described above, and its purpose is to reduce the number of parts and simplify the structure, significantly reduce manufacturing costs, and reduce the number of parts and materials. It is an object of the present invention to provide a magnetic recording/reproducing device that reduces the strength required for tape loading, has an extended operating life, and performs stable tape loading operations.

<Means for Solving the Problems> In order to achieve the above object, the present invention rotates a driving body by a motor, and over a predetermined angular range of this rotation, the first lever and the first lever are connected by engagement with the driving body. The second lever rotates in opposite directions, and this rotation causes the first lever to rotate in opposite directions.
A first movable body and a second movable body connected to the lever and the second lever respectively move, and the movement of these movable bodies pulls out a magnetic tape from inside the cassette pack, and this magnetic tape is transferred to the head. In a magnetic recording/reproducing device that is wound around a cylinder, the first lever and the second lever are biased in most areas within the predetermined angular range so as to resist the rotation of each of the first lever and the second lever, and the magnetic recording/reproducing device is biased so as to resist the rotation of each of the first lever and the second lever in most areas within the predetermined angular range; biasing means for biasing the first lever and the second lever to rotate in their respective rotational directions;
The lever is provided between the lever and the second lever.

<Operation> In the present invention, when the driving body is rotated by the motor, the first lever engaged with the drive body through, for example, a gear, over a predetermined angular range of this rotation, and the first lever and the first lever engaged through, for example, a gear, The engaged second lever rotates in opposite directions.

A biasing means, such as a tension spring, is provided between the first lever and the second lever, and in most of the predetermined angular range, the biasing means rotates the first lever driven by the driving body; The second lever is biased against rotation in opposite directions.

A rotational force that overcomes the biasing force of the biasing means is applied by the motor to the first lever and the second lever via the drive body, and the first lever and the second lever rotate in opposite directions. Go. By this rotation, the first moving body b) connected to the first lever and the second moving body b) connected to the second lever move within the guide groove, and the first The magnetic tape is pulled out from the inside of the cassette by the moving body and the second moving body.

Furthermore, when the rotation of the first lever and the second lever progresses and the rotation angle thereof exceeds a predetermined area of the predetermined angle range, the engagement between the driving body and the first lever and the second lever is interrupted. From this rotation angle, the rotation of the first lever and the second lever is urged by the biasing force of the biasing means.

Therefore, after that, the first lever and the second lever continue to rotate due to the biasing force of the biasing means, and the first moving body and the second moving body move to their final positions, and the magnetic tape is The tape is wound around the head cylinder and the tape loading operation is completed.

In the tape loading release operation, when the drive body is rotated in the opposite direction by the motor from the tape loading state, the first lever and the second lever are moved against the biasing force of the biasing means in a predetermined angle range. Due to the engagement, the magnetic tape rotates in opposite directions, and the magnetic tape is separated from the head cylinder by the first moving body and the second moving body. The rotation of the first lever and the second lever beyond a predetermined angle range is performed by the biasing force of the biasing means, and the magnetic tape is wound into the cassette pack by the tape winding means.

<Example> Hereinafter, an example of the present invention will be described using FIGS. 1 to 5.

Here, FIGS. 1 to 5 explain the present invention in detail, and FIG. 1 is a back view of the tape loading mechanism, FIG. 2 is a side sectional view of the main parts of the tape loading mechanism, and FIG. 3 to 5 are explanatory diagrams of the tape loading operation, and in these figures, the already explained FIGS.
The same parts as in FIG. 1 are given the same reference numerals.

As shown in FIGS. 1 and 2, the chassis 4 is supported by
Jl is fixed to i, a gear 29 is rotatably attached to the column i, and a drive gear 28 that meshes with the gear 29 is rotatably attached to the column i. This drive gear 28 is formed with teeth 28T that mesh with the main lever 26 rotatably attached to the support column k over a predetermined angle range θ.

In addition, the main lever 26 is rotatably attached to the support column k.
Teeth 26T are formed to mesh with the aforementioned teeth 28T. A follower lever 27 is rotatably attached to the post), and the follower lever 27 and the main lever 26 have teeth 27.
They mesh with each other at t and 26t.

One joint is rotatably attached to the main lever 26 via a pin 17, and the first movable body 13 located in the guide groove a is rotatably attached to the end of this joint 19. ing.

Similarly, a joint 20 is rotatably attached to the slave lever 27 via a pin 18, and a second movable body 14 located in the guide groove a is rotatably attached to the end of the joint 20. It can be installed freely.

The hook 2 is connected to the main lever 26 and the slave lever 27.
6a and 27a respectively protrude, and these hooks 26a
, 27a, and the biasing force of this tension spring 34 draws the hooks 26a, 27a toward each other.

Further, the rotational force of the motor 32 is transmitted to the shaft 33 via the belt 31.
The shaft 33 meshes with the gear 29, and the motor 3
The rotational force of 2 is transmitted to the gear 29 via the shaft 33.

The configuration of other parts of the embodiment is already shown in FIGS. 6 to 1.
This is the same as the conventional magnetic recording/reproducing apparatus described using FIG.

In the embodiment of the present invention having such a configuration, the main lever 2
6 is the first lever, slave lever 27 is the second lever,
Further, the tension spring 34 constitutes a biasing means.

The operation of the embodiment will be explained next.

FIG. 3 shows the state before the start of tape loading operation in the embodiment, in which the first moving body 13 and the second moving body 1
4 are located at the ends of the guide grooves 4a remote from the head cylinder 5, and the magnetic tape is not pulled out from the cassette pack.

When the motor 32 in FIG. 1 starts rotating from this state,
The rotation of the motor 32 is transmitted to the drive gear 28 via the belt 31, shaft 33, and two gears, and the drive gear 28 rotates.

In this case, when the drive gear 28 rotates counterclockwise, the teeth 28T of the drive gear 28 and the teeth 26T of the main lever 26 do not mesh with each other, so the main lever 26 and the slave lever 27 are pulled together by the tension spring 34. It is stationary. Therefore, by counterclockwise rotation of the drive gear 28, an operation other than the tape loading operation, such as loading a cassette pack, is performed.

When the drive gear 28 rotates clockwise from the state shown in FIG. 3, the teeth 28T of the drive gear 28 and the teeth 26T of the main lever 26 mesh with each other, so the main lever 26 rotates counterclockwise.
The slave lever 27 that meshes with the main lever 26 rotates clockwise. Therefore, the first movable body 13 is pushed into the guide groove a toward the stopper 4C by the joint 19, and the second movable body 14 is pushed through the guide groove a toward the stopper 4C by the joint 20. .

In this way, when the drive gear 28 is rotated clockwise by the motor 32 against the biasing force of the tension spring 34, the guide post 13a of the first moving body 13 and the second moving body 14 are rotated. The magnetic tape is pulled out from the cassette pack by the guide post 14a, and the tape loading operation progresses. Due to the rotation of the main lever 26 and the slave lever 27, the tension spring 34 is pulled against its biasing force, and the tension spring 34 reaches its dead center of maximum extension, as shown in FIG.

The main lever 26 and the slave lever 27 beyond this dead center position
, the biasing force of the tension spring 34 acts in a direction that supports the rotation.

FIG. 5 shows a state in which the first movable body 13 and the second movable body 14 have moved within the guide groove a to the end on the stopper 4c side, and the last tooth 2 of the teeth 26T of the main lever 26
Only 6TL is located within the rotational path of the tips of the teeth 28T of the drive gear 28.

In addition, in this state, only the first tooth 27tF of the slave lever 27 is the tooth 26t that meshes with the slave lever 27 of the main lever 26.
It is located within the rotational path of the tooth tip.

In the state shown in FIG. 5, the main lever 2 is
6 is biased counterclockwise, and the slave lever 27 is biased clockwise, and this biasing force pushes the first movable body 13 and the second movable body 14, respectively, toward the stopper 4 via joints 19 and 20.
Pressing on C.

In this way, the reason why the main lever 26 and the slave lever 27 are disengaged from each other at the position where the first moving body 13 and the second moving body 14 are in contact with the stopper 4C is due to the stopper 4c. This is to enable the first moving body 13 and the second moving body 14 to move independently and follow the error within the error range of position accuracy.

When the drive gear 28 is further rotated clockwise by the motor 32 from the state shown in FIG. 5, the drive gear 28 presses, for example, the pinch roller arm 11 to the capstan 10 while the magnetic tape is wound around the head cylinder 5. It is possible to perform the following actions.

To cancel the tape loading operation performed in this way, rotate the drive gear 28 counterclockwise.
The last tooth 28TL of the tooth 28T is the tooth 26T of the main lever 26.
meshes with the last tooth 26TL, and sequentially teeth 28T and 26T.
The main lever 26 rotates clockwise. As the main lever 26 rotates, the first tooth 26tF of the tooth 26t of the main lever 26 that meshes with the slave lever 27 and the first tooth 27tF of the tooth 27t of the slave lever 27 that meshes with the main lever 26 are brought into mesh with each other. Lever 26 and slave lever 2
7 rotate in opposite directions while meshing with each other.

Therefore, the first moving body 1
3 and the second moving body 14 respectively move in the direction away from the head cylinder 5 within the guide groove a, the magnetic tape is unloaded from the head cylinder 5, and the magnetic tape is wound into a cassette pack by a tape winding means (not shown). rolled up inside.

According to the embodiment, before and after the tape loading operation, the drive gear 28 is rotated over a wide angle range with the drive gear 28 completely disengaged from the main lever 26, and the cassette pack is loaded. , operations such as pressing the pinch roller 11 onto the capstan 10 can be performed with sufficient margin and with a small rotational force. The strength of the driving member is not required, and the motor 32 is no longer required to have strict characteristics, and the stability and durability of operation are greatly improved.

Furthermore, the number of parts is reduced compared to the conventional method, the structure is simpler, and the manufacturing cost of the device is also significantly reduced.

In the embodiment, a tension spring is used as the biasing means, but the present invention is not limited to the embodiment, and a torsion spring can also be used as the biasing means. Furthermore, in the embodiments, the drive gear is provided with teeth that mesh with the main lever and teeth that mesh with the gear that transmits the rotation of the motor, but the present invention is not limited to the embodiments. Alternatively, the gear that meshes with the main lever and the gear that transmits the rotation of the motor may be provided at different levels.

<Effects of the Invention> As explained in detail above, according to the present invention, the number of parts is reduced, the structure is simplified, manufacturing costs are reduced, and the loads are completely separated between the tape loading operation and other operations. It is possible to provide a magnetic recording and reproducing device that operates with a small rotational force, requires less demanding characteristics of the parts used, operates stably, and has an extended operating life.

[Brief explanation of the drawing]

FIG. 1 is a back view showing the configuration of the tape loading mechanism in an embodiment of the present invention, FIG. 2 is a side sectional view showing the configuration of the main parts of FIG. 1, and FIG. 3 is a tape in the embodiment of the present invention. FIG. 4 is an operation explanatory diagram showing the state before loading starts, FIG. 4 is an operation explanatory diagram showing the state during tape loading in the embodiment of the present invention, and FIG. 5 is the state after tape loading is completed in the embodiment of the present invention. An explanatory diagram of the operation shown,
FIG. 6 is a plan view showing the configuration of the tape loading mechanism of a conventional magnetic recording/reproducing device, FIG. 7 is a rear view showing the configuration of the main parts of FIG. 6, and FIG. 9 is a detailed view showing the configuration of the main part of FIG. 7, FIG. 10 is a plan view showing the tape loading state of the conventional magnetic recording/reproducing device, and FIG. 11 is the conventional magnetic recording/reproducing device. FIG. 3 is a back view showing the tape loading state of the recording/reproducing device. 4...Chassis, 4a...Guide groove,
4C...Stopper, 5...Head cylinder, 13...First moving body, 13a...
...Guide post, 14...Second moving body, 1
4a...Guide post, 19.20...
・Joint, 26...Main lever, 27...
...Following lever, 28...Driving gear, 29...
... Gear, 32 ... Motor, 34 ...
...Tension spring. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 7 Figure 8 21 4e 23 23a Figure 9! 7 No. 9 Figure 10 Figure 11

Claims (1)

[Claims] (1) A driving body is rotated by the motor, and over a predetermined angular range of this rotation, the first
The lever and the second lever rotate in opposite directions, and this rotation causes the first moving body and the second moving body to be connected to the first lever and the second lever, respectively. In a magnetic recording/reproducing device in which the magnetic tape is pulled out from inside the cassette pack by the movement of these moving bodies, and this magnetic tape is wound around a head cylinder, most of the area within the predetermined angular range is , biased to resist rotation of the first lever and the second lever, and outside the predetermined angular range, the first lever and the second lever
A magnetic recording/reproducing apparatus, characterized in that a biasing means for biasing the levers so as to rotate them in respective rotational directions is provided between the first lever and the second lever.