JPH0568779B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a magnetic recording/reproducing device.

<Prior art> In a magnetic recording/reproducing device, a first moving body that operates in a first mode and a second moving body that operates in a second mode are selectively driven by a common drive transmission means. It has the following configuration. For example, a mechanism for loading a tape as a first moving body may also be used as a second moving body.
The moving body includes a slider for operating the brake of the tape reel stand, and these sliders are selectively driven by a drive transmission means consisting of a common gear train.

FIG. 11 is a diagram showing the configuration of first and second movable bodies of a conventional magnetic recording/reproducing apparatus and drive transmission means for these movable bodies.

A ring 40 is provided as the first moving body for loading the tape, and the ring 40 is provided rotatably in the direction of arrow Z. A gear 42 meshes with the ring 40, and the gear 42 causes the ring 40 to
is configured to be driven.

On the other hand, as a second moving body, for example, a brake actuation slider 41 of a tape reel stand is provided,
A gear 43 meshes with the slider 41, and the slider 41 is driven by the gear 43.

One end of a lock lever 44 is rotatably engaged with an end of a plunger iron core 45 whose entry and exit are controlled by a plunger 46. The lock lever 44 is rotatably arranged around a fulcrum 47, and has a lock piece 44L integrally formed at the other end of the lock lever 44.

The operation of the conventional magnetic recording/reproducing apparatus shown in FIG. 11 will be explained.

FIG. 11 shows a state in which the plunger iron core 45 protrudes from the plunger 46, and in this state, the lock lever 44 is positioned such that the lock piece 44L is engaged with the gear 42. The gear 42 is stopped by the engagement between the lock piece 44L and the gear 42, and the ring 40 is stopped by the stop of the gear 42.
No tape loading is performed.

On the other hand, since the gear 43 is not engaged with the lock piece 44L, the slider 41 is moved in the direction of arrow V by the gear 43, and the tape reel stand rotates without any braking action being performed on the tape reel stand.

In this state, as shown in the section from time O to A in FIG. 12, the operation in the second mode in which the ring 40, which is the first moving body, stops and the slider 41, which is the second moving body, moves. Selection is running.

When the plunger iron core 45 is drawn into the plunger 46, the lock lever 44 rotates and the lock piece 44L is locked with the gear 43. Lock piece 44
Due to the engagement between L and the gear 43, the gear 43 stops and the slider 41 stops. Therefore, a brake operation is performed on the tape reel stand, and the tape reel stand is stopped.

On the other hand, the gear 42 is released from the locking piece 44L, and the ring 40 is rotated by the drive of the gear 42, thereby loading the tape.

In this state, as shown in the section from time A to B in FIG. 12, the first mode of operation in which the ring 40, which is the first moving body, rotates and the slider 41, which is the second moving body, stops. Selection is running.

Although not shown, the slider 41 or ring 4
The above-mentioned operation is performed by providing a position detection switch at the position detection switch 0 and turning the plunger 46 ON and OFF based on its output.

<Problems to be Solved by the Invention> The conventional magnetic recording/reproducing device described above uses an expensive plunger as a component and also requires a drive circuit for the plunger, which increases the overall size and manufacturing costs. In addition, power consumption for driving is large, and operating costs also increase. Furthermore, since it is driven by a plunger, there is a drawback that the impact noise during operation is large.

This invention was made in view of the current state of magnetic recording and reproducing devices as described above, and its purpose is to configure the selection mechanism by a combination of a cam and a lever without using a plunger, thereby reducing the overall size and manufacturing cost. Another object of the present invention is to provide a magnetic recording and reproducing device that can significantly reduce operating costs and that can operate with high precision without producing any impact noise.

<Means for Solving the Problems> In order to achieve the above object, the present invention extracts two outputs from one drive source and selectively transmits these outputs to the first moving body and the second moving body. In the magnetic recording and reproducing apparatus, the magnetic recording and reproducing apparatus includes a drive transmission means for transmitting the drive to the first movable body and the second movable body, and causes the first movable body and the second movable body to operate in the first mode and the second mode. It consists of a rotating body that rotates according to the output of the source, and a gear mechanism that selectively moves only one of the first moving body and the second moving body as the rotating body rotates. The first movable body has a cam that rotates by an output of a drive source, a locking portion provided on each of the first movable body and the second movable body, and a pin that engages with the cam, an engaging body that selectively engages with each of the locking portions of the second movable body to prevent movement of the corresponding first movable body and second movable body, and rotation of the cam; and a lever that is swingable in either one predetermined direction or another direction opposite to the one direction, and as the cam rotates, the lever swings in the one direction through the pin. and the other direction, the engaging body of the lever selectively locks either the first moving body or the second moving body. The movable body is engaged with the movable body to prevent movement of one of the movable bodies, and is configured to enable movement of the other movable body only by the output of the drive source via the drive transmission means.

<Operation> Since the present invention has the above-described structure, the lever swings in one direction via the pin due to the rotation of the cam, and as a result, the engaging body of the lever locks, for example, the first movable body. The first movable body is engaged with the second movable body to prevent movement of the first movable body, and at this time, only movement of the second movable body by the output of the drive source is enabled via the drive transmission means. Further, when the lever swings in the other direction via the pin due to the rotation of the cam, the engaging body of the lever engages with, for example, the locking part of the second movable body, and the lever swings in the other direction via the pin. The first moving body is prevented from moving, and at this time, only movement of the first movable body by the output of the drive source is enabled via the drive transmission means. For this,
There is no need to use an expensive and large-sized plunger, and the manufacturing and operating costs of the device can be reduced, and the entire device can be significantly downsized.

In addition, no impact noise is generated during operation, and smooth and highly accurate operation can be achieved.

<Example> Hereinafter, the magnetic recording/reproducing apparatus of the present invention will be described in detail based on an example using the drawings.

FIG. 1 is a cross-sectional view showing the configuration of the main part of an embodiment of the invention, and FIG. 2 is a sectional view showing the embodiment of the invention, which is engaged with the first and second cams with pins to perform rotational movement. It is a figure showing the composition of the lever which carries out. Also,
FIGS. 3 to 10 are operation explanatory diagrams showing the state of engagement between the engaging body of the lever and the locking portion of the first or second movable body, corresponding to each operating position.

First, the configuration of the main parts of the drive transmission means in the embodiment of the present invention will be explained based on FIG.

A worm 4 that transmits driving force from a drive source is meshed with a rotating body 5, a shaft 8 is provided passing through the center of the rotating body 5, and the rotating body 5 is arranged to be freely rotatable around the shaft 8. has been done.

A gear 6 is disposed on the rotary body 5 so as to be fitted onto the shaft portion 5S of the rotary body 5, and the gear 6 is rotatably disposed around the shaft portion 5S. This gear 6 has a plurality of shafts 9 formed on the same circumference around the shaft 8 and protruding at right angles to the plate surface.

On the gear 6, a gear 7 is rotatably fitted to a shaft 9, and this gear 7 is connected to the rotating body 5 and its shaft portion 5S.
They are meshing in each other.

A gear 24 is disposed on the protruding end surface of the shaft portion 5S of the rotating body 5 and is rotatably fitted to the shaft 8.
is meshing with gear 7.

A gear 12 that meshes with the gear 6 is rotatably disposed around a shaft 13.

A gear 10 that meshes with the shaft portion 5S of the rotating body 5 is rotatably mounted around a shaft 11. A gear 14 is disposed in mesh with the gear 10 so as to be rotatable around a shaft 15. A gear or second cam 20 is disposed so as to be rotatable about the shaft 18 and mesh with the gear 14 .

Further, a gear, that is, a first cam 19 is disposed rotatably around the shaft 18, and this first cam 19
A gear 17 that meshes with the gear 14 is rotatably disposed around the shaft 16. Due to this gear 17, the gear 20 and the gear 19 are set to rotate at the same rotational speed with opposite rotational directions.

The configurations of the first and second moving bodies, first and second cams, and levers that are coupled to and driven by the drive transmission means will be described.

A ring 1 serving as a first moving body, also shown in FIG. 3 and the like, is attached to mesh with the gear 24. The ring 1 has first and second engaging recesses 37 and 38, which serve as locking parts, formed at its peripheral edge with an angular difference of 90 degrees with respect to the center of the ring 1.
These engaging recesses 37 and 38 are configured to be engageable with lever engaging bodies, which will be described later.

The ring 1 is used for the purpose of tape loading, is driven by the drive transmission means described above, and is configured to complete tape loading by rotating clockwise through a predetermined angle.

A slider 2 as a second moving body is attached to mesh with the gear 12. The slider 2 is formed into a substantially rectangular parallelepiped shape, and an engagement recess 39 serving as a locking portion is formed in the center thereof. This engagement recess 39 is configured to be engageable with an engagement body of a lever, which will be described later.

Slider 2 is used to operate the brake of the tape reel stand, and moves 1mm to the left before tape loading, and moves 1mm to the left after tape loading.
Configured to move mm to the left.

As shown in FIGS. 3 and 4, the first and second cams 19 and 20 are each formed in the shape of a piece with a part of the circumference of a disc protruding like a fan. 19 and 20 are arranged on top of each other so as to be rotatable about the common shaft 18.

As shown in FIG. 2, the lever 25 has a configuration in which the respective ends of first and second lever pieces 26 and 27 in the shape of a flat plate are connected to each other so as to be rotatable about a shaft 28. A mounting piece 29 is integrally formed to protrude from the end of the first lever piece 26 , and a leaf spring 32 having one end fixed to the mounting piece 29 is arranged to protrude in the extending direction of the first lever piece 26 . There is.

On the second lever piece 27, holding pieces 30, 31 are formed to protrude at right angles to the plate surface.
The tip of the leaf spring 32 is sandwiched between the plates 31 and 31 .
A pin 35 is formed to protrude from the end of the second lever piece 27, and a locking pin 36 as an engaging body is formed to protrude from the end of the first lever piece 26.

As shown in FIGS. 3 to 10, the lever 25 is arranged so that the shaft 28 is fixed and the pin 35 is engageable with the first and second cams 19 and 20. The locking pin 36 of this lever 25 is connected to the locking portions, that is, the first and second engaging recesses 37 and 3.
A ring 1 is disposed so as to be latched to the ring 8 , and a slider 2 is disposed close to and opposite the ring 1 so that the latching pin 36 can be latched to the latching portion, that is, the engagement recess 39 .

The operation of the drive transmission means portion of this invention will be explained using FIG. 1.

The drive transmission means in this invention transmits the rotational force from the drive source to the rings 1, which are the first and second movable bodies.
and the slider 2. This selection operation is performed by the lever 25, and the locking pin 36 locks with the engagement recess of one of the ring 1 and the slider 2, thereby selectively locking either the ring 1 or the slider 2. It is done by doing.

First, a case will be explained in which the first moving body, ring 1, is in a locked state.

The rotational force from the drive source is applied to the worm 4 shown in Figure 1.
is transmitted to the rotating body 5, and the rotating body 5 rotates. In this case, since the slider 2 is in an unlocked state, the gear 12 is rotatable. Therefore, the rotation of the rotating body 5 causes the gear 6 on the rotating body 5 to rotate around the shaft 8.

The gear 7 inserted through the shaft 9 rotates integrally with the rotating body 5 and the gear 6 on the circumference drawn by the shaft 9 while meshing with the gear 24 . In this case, ring 1
Since the gear 24 is in a locked state, the gear 24 cannot rotate around the shaft 8.

Therefore, the gear 7 meshing with the gear 24 rotates around the shaft 9 due to this meshing, and rotates around the shaft portion 5S.
Due to the meshing with the shaft 9, it revolves around the circumference drawn by the shaft 9.

A gear 12 meshing with the gear 6 rotates around a shaft 13. This rotation causes the slider 2 that meshes with the gear 12 to move.

Further, as the rotating body 5 rotates, the gear 10 that meshes with the shaft portion 5S rotates around the shaft 11. As the gear 10 rotates, the gear 14 that meshes with the gear 10 rotates around the shaft 15. The second cam 20 meshes with the gear 14 as the gear 14 rotates.
rotates. Further, the gear 17 meshed with the gear 14 is driven by the gear 14 and rotates. gear 1
7 rotates the first cam 19 that meshes with the gear 17 in the opposite direction to the second cam 20.

In this way, when the ring 1 is in the locked state, the slider 2, which is the second moving body, is selectively driven by the drive transmission means, and the second mode of operation is performed.

In this case, the first and second cams 19 and 20
are rotating in opposite directions.

Next, the case where the slider 2, which is the second moving body, is in the locked state will be explained.

In this case, slider 2 is in the locked state,
The gear 12 is in a state where it cannot rotate around the shaft 13. The rotational force from the drive source is transmitted to the rotating body 5 by the worm 4, and the rotating body 5 rotates. Rotating body 5
Since the upper gear 6 meshes with the gear 12, it is stopped on the rotating body 5 about the shaft 8.

Therefore, since the gear 7 is inserted into the shaft 9 and is meshed with the shaft portion 5S, the shaft 9 is stopped.
It rotates around. Since the gear 7 rotates, the gear 24 meshing with the gear 7 rotates, and the gear 24 rotates.
As the ring 1 rotates, the ring 1 meshing with the ring 1 rotates.

In this manner, when the slider 2 is in the locked state, the ring 1, which is the first moving body, is selectively driven by the drive transmission means, and the first mode of operation is performed.

Also in this case, the first and second cams 19 and 2
0 are rotating in opposite directions.

first and second cams 19 and 20 of this invention,
The operation between the lever 25, the first moving body, ie, the ring 1, and the second moving body, ie, the slider 2 will be explained using FIGS. 3 to 10.

In the initial state shown in FIG. 3, the lever 25 is arranged substantially in a straight line, and the end of the second lever piece 27 is in contact with the disk portion of the second cam 20. The locking pin 36 is located in the second engagement recess 39, and the ring 1 is prevented from rotating by the locking pin 36 and is in a locked state.

When the first and second cams 19 and 20 are rotated by 90 degrees in the position shown in FIG. 4, the engagement recess 39 of the slider 2 coincides with the second engagement recess 38 of the ring 1. During this time, the fan-shaped portion of the second cam 20 pushes up the pin 35 of the second lever piece 27, and the second lever piece 27 rotates around the shaft 28 in the direction of the arrow θ in FIG.

This rotation causes the first lever piece 26 to rotate in the direction of the arrow ψ in FIG. 4, the locking pin 36 is inserted into the engagement recess 39, the slider 2 is locked, and the ring 1 is in the locked state. is solved. Therefore, the brake of the tape reel stand (not shown) is activated,
Tape loading begins.

FIG. 5 shows the first and second cams 1 from the initial state.
When rings 9 and 20 are rotated 225°, ring 1 is the fifth
It is rotating in the direction shown by the arrow Ψ in the figure. On the other hand, the pin 35 is pushed down by the sector of the first cam 19,
The first lever piece 26 is connected to the first lever piece 26 via the plate spring 32.
A biasing force is applied in the direction indicated by the arrow ψ with the axis 28 as the center.

In this state, a loading operation is being performed to wrap the tape around a rotating cylinder (not shown).

FIG. 6 shows the first and second cams 1 from the initial state.
9 and 20 are rotated 270 degrees, the first engagement recess 37 position of the ring 1 is the engagement recess 3 of the slider 2.
Matches 9. Therefore, due to the biasing force of the leaf spring 32, the locking pin 36 of the first lever piece 26 is
is inserted into the engagement recess 37 of.

The ring 1 is prevented from rotating by the locking pin 36 and becomes locked, and the slider 2 is released from the locked state. In this state, the tape loading operation is completed and the brake of the tape reel stand is released.

FIG. 7 shows that the first and second cams 19, 20 are
When rotated 360 degrees, the rotation of the ring 1 is locked and the slider 2 is movable in the direction of the arrow X in FIG. In this state, no tape loading operation is performed and the brake of the tape reel stand is released. From the state shown in FIG. 7, the drive source motor rotates in the opposite direction. Therefore, the slider 2 moves in the direction of arrow X by driving the gear 12.

FIG. 8 shows a case where the first and second cams 19 and 20 have reached the same position as in FIG. 6, where the first and second cams 19 and 20 have reached an angular position of 270° from the initial state due to the reversal of the motor of the drive source. The engagement recess 39 of the slider 2 matches the first engagement recess 37 of the ring 1, the second lever piece 27 is pushed up by the sector of the first cam 19, and the biasing force of the leaf spring 32 causes the second lever piece 27 to be pushed up. The first lever piece 26 rotates in the direction of the arrow ψ, and the locking pin 36 is inserted into the engagement recess 39.

Therefore, the slider 2 is locked by the locking pin 36, and the ring 1 is unlocked. Therefore, the brake of the tape reel stand (not shown) is activated, and tape unloading is started.

FIG. 9 shows the first and second cams 19 and 20.
This is the case when the state reaches the same position as the state where the angle position is 135° from the initial state. The lever 25 is arranged substantially in a straight line, and the ring 1 is rotated in the direction of the arrow Ψ to perform a tape unloading operation.

FIG. 10 shows the first and second cams 19 and 20.
This is the case when the state reaches the same position as the state where the angle position is 90° from the initial state. The engagement recess 39 of the slider 2 and the second engagement recess 38 of the ring 1 match, the pin 35 is pushed down by the fan-shaped part of the second cam 20, and the biasing force of the leaf spring 32 causes the ψ in FIG.
The first lever piece 26 rotates in the direction, and the locking pin 3
6 is inserted into the second engagement recess 38 of the ring 1. In this state, the slider 2 is released from the locked state, the brake operation of the tape reel stand (not shown) is released, and the slider 2 starts moving in the direction of the arrow X in FIG. Ring 1 becomes locked and the tape unloading operation is completed.

When the first and second cams 19 and 20 reach a position rotated by 90° from the state shown in FIG. 10, the same state as shown in FIG. 3 is obtained. From this state, the drive source motor rotates in reverse, and the same operation is repeated.

first and second cams 19, 20, lever 25,
First and second engagement recesses 3 formed in the ring 1
7, 38 and the engagement recess 3 formed in the slider 2
9, the selection switching operation between the ring 1 and the slider 2 is performed with high precision and without producing any impact noise.

In the embodiment configured in this way, since no plunger is used, manufacturing costs can be reduced, the overall size can be significantly reduced, and quiet and smooth operation is performed without impact noise.

In the embodiment, the ring 1, which is a rotating body, is used as the first moving body, and the slider 2 is used as the second moving body. but,
Both the first and second moving bodies are rotating bodies;
Alternatively, it is also possible to use both the first and second moving bodies as sliders.

<Effects of the Invention> As explained in detail above, according to this explanation, it is possible to make the magnetic recording/reproducing device perform the necessary mode switching operation without using a plunger, and the overall size can be reduced and manufacturing costs and costs can be reduced. Power consumption can be reduced, and the plunger can operate quietly and smoothly without noise during operation. It becomes possible to provide a magnetic recording/reproducing device.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing the structure of the drive transmission means according to the embodiment of the invention, FIG. 2 is a plan view showing the structure of the lever according to the embodiment of the invention, and FIGS.
Fig. 0 is an operation explanatory diagram showing each state of ring and slider switching drive in an embodiment of the present invention, and Fig. 11 shows the configuration of a ring and slider switching drive unit in a conventional magnetic recording/reproducing device. The principle explanatory diagram, FIG. 12, is a characteristic diagram of the mode switching operation in the magnetic recording/reproducing apparatus. 1...Ring (first moving body), 2...Slider (second moving body), 5...Rotating body, 5S...Shaft portion, 6, 7, 10, 12, 14, 17... Gear ,
19...first cam, 20...second cam, 8,
9, 11, 13, 15, 16, 18...axis, 25
... Lever, 26 ... First lever piece, 27 ...
Second lever piece, 32... leaf spring, 35... pin, 36... locking pin (engaging body), 37... first
38...second engagement recess (locking part), 39...engaging recess (locking part).

Claims (1)

[Scope of Claims] 1. Drive transmission means for extracting two outputs from one drive source and selectively transmitting these outputs to a first moving body and a second moving body, In the magnetic recording and reproducing device, the drive transmission means includes a rotating body that rotates in accordance with an output of the drive source, and a rotating body that rotates in response to an output of the drive source. a gear mechanism that selectively moves only one of the first moving body and the second moving body as the body rotates; a cam that rotates by the output of the drive source; A locking portion provided on each of the movable body and the second movable body, and a pin that engages with the cam, and a locking portion provided on each of the first movable body and the second movable body. has an engaging body that engages with the cam to prevent the movement of the corresponding first moving body and second moving body, and as the cam rotates, it moves in a predetermined direction and in this one direction. and a lever that is swingable in one of the other directions that are opposite directions, and as the cam rotates, the lever swings in either the one direction or the other direction via the pin. As a result, the engaging body of the lever selectively engages with the locking portion of either the first moving body or the second moving body, and the engagement body of the one of the moving bodies A magnetic recording/reproducing apparatus characterized in that the movement of the other moving body is prevented, and the other movable body is allowed to move only by the output of the drive source via the drive transmission means.