JPS6262461A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To simplify the device, to reduce the number of parts and to make a driving part extremely thin by operating selectively a driving gear disposed between an idler and a reel stand in a direction of a rotating shaft of the gear. CONSTITUTION:A driving plate 8 is moved, the second driving gear is selected so as to engage with an idler gear lower part 11. Under this state, an idler gear upper part 10 is never engaged with the first driving gear 7, which is the second transmission system. Then, the rotation or the torque from a capstan or a reel motor is transmitted to a junction gear 15 and the rotation and the torque transmitted to the junction gear 15 is transmitted directly to the idler gear lower part 11, the second driving gear 9, a stopper gear 5, and the reel stand 1. The rotation and the torque from the capstan or the reel motor are transmitted to the junction gear 15. The rotation and the torque transmitted to the junction gear is transmitted indirectly to the idler gear upper part 10, the first driving gear 7 and a clutch gear 3 through a clutch mechanism.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to magnetic recording and reproducing devices such as video tape recorders.

BACKGROUND OF THE INVENTION In recent years, magnetic recording and reproducing devices such as video tape recorders are desired to be smaller, lighter, thinner, have higher performance, and lower cost.

Hereinafter, an example of the reel drive mechanism of the above-described conventional magnetic recording/reproducing device will be described with reference to the drawings.

6(a) and (1)) are plan views of the reel drive mechanism of a conventional magnetic recording/reproducing device, FIG. 7 is a sectional view showing the meshing relationship, and FIGS. 8 to 10 are schematic diagrams for explaining its operation. FIG. In FIGS. 6 and 7, 1 is a tape (
22 is a drive gear that drives the reel stand 1; 24 is a clutch gear that is coaxial with the drive gear 22 and transmits rotation and torque to the drive gear 22 via a clutch mechanism; , 23 is a part of the clutch mechanism, and 26 is a clutch spring that generates clutch force, and 26 generates friction force between it and the clutch gear 24, and transmits the rotation of the clutch gear 24 to the drive gear 22 with a set torque. Clutch felt 26 is a stopper ring that integrates the clutch mechanism.

These 22, 23, 24, 25, 26 constitute a clutch mechanism. When the clutch gear 24 is driven, a constant torque is transmitted to the reel stand 1 via the clutch mechanism. Further, since the rotation speed of the reel stand 1 during driving is via the clutch mechanism, it can take any value as long as it is lower than the rotation generated by the clutch gear 24.

29 is a relay gear that transmits rotation from a drive source such as a capstan, and 31 is a plan view of the upper layer shown in FIG. 32 is on the idler gear shaft which is the rotation center of the idler gear 31 which is transmitted to the stand 1;
Reference numeral 33 transmits the rotation and torque from the drive source clearly shown in the plan view of the lower layer in FIG. 6(a) and the cross-sectional view of FIG. 7 to the reel stand 1 through the clutch mechanism and indirectly through the drive gear 24. Below the idler gear, 34 is below the idler gear shaft which is the center of rotation of the lower idler gear 33, and 30 is the arrow C pointing left and right (in Fig. 6) selectively above the idler gear and below the idler gear.
) to select the reel stand 1 to be driven (the reel stand 1 on the left and the drive gear are not shown).The idler felt generates the clutch force by friction force, and 36 generates the clutch force in the idler. The idler arm 28 is on the idler arm, which supports the idler gear shaft which is the rotational support shaft on the idler gear, and forms a support arm for left and right rotation on the idler mechanism, and 37 is the rotational support shaft below the idler gear. This is the lower idler arm that supports the lower part of the idler gear shaft and forms the support arm for left and right rotation under the idler mechanism. Also, 2B, 30, 31.
The mechanism composed of 32.36 is called the upper idler mechanism, and the mechanism composed of 30°33.36.36 is called the lower idler mechanism.

27 allows left and right rotation on the idler mechanism in various modes,
The upper control plate 36 is for restricting or releasing the restriction, and the lower control plate 36 is for performing the same operation as the lower idler mechanism. 19 is a reel shaft that is the rotation center of the reel stand 1; 2o is a drive gear shaft that is the rotation center of the drive gear and clutch gear 24; 21 is a relay gear shaft that is the rotation center of the relay gear 29; 18 is 19, 20 , 21 are fixed to each other. Further, hl indicates the configuration height of the reel stand drive mechanism.

The operation of the reel drive mechanism of the conventional magnetic recording and reproducing apparatus configured as described above will be described below.

First, the driving operation of the reel stand 1 will be explained.

In a magnetic recording/reproducing device, the operation of the idler mechanism is restricted depending on the selection of each mode provided.

As a first transmission example, the transmission states shown in FIGS. 6(a) and 7) will be explained. First, as shown in FIGS. 6(a) and 7, the lower part of the idler mechanism is fixed in its rotational movement by the operation of the lower control plate 35. In this state, the lower part of the idler mechanism cannot engage with the clutch gear 24, so the reel stand 1 is not driven by the clutch mechanism. On the other hand, when the upper control plate 31 moves and releases the restriction on the rotational movement on the idler mechanism, the idler becomes able to rotate in any direction, and as shown in FIG. , it becomes possible to mesh with the drive gear 22. Next, when the tape is running and the rotation and torque from the capstan or reel motor (not shown) are transmitted to the relay gear 29, the rotation and torque are transferred to the reel through the drive gear due to the idler mechanism. 1 unit
directly transmitted to.

However, in this transmission system, rotation and torque are directly transmitted, so the tape (not shown) is transferred at a constant speed.
In the recording and playback mode in which the tape runs, if a capstan is used as the drive source for the reel stand 1, the rotational speed of the capstan, which is the drive source, is constant, but the driven reel stand 1 is The contradictory problem arises in that the number of rotations changes constantly as the material is wound up. Furthermore, even if another motor is used to drive the reel stand, in order to run the tape in a stable state, it is necessary to drive the reel stand 1 with a torque below a certain value; There is a problem that it cannot be used in combination with modes that require a torque of . Therefore, in a conventional magnetic recording/reproducing device, as shown in FIG. 6, a transmission system with upper and lower layers is used to separate changes in the rotational speed of the reel stand 1 and torque on the reel stand 1 from the rotational speed and torque of the drive source. It is equipped with transmission gear 29
The rotation and torque of is transmitted onto and below the idler mechanism in the same manner as in the first transmission system. However, when the second transmission system is selected, the operation on the idler mechanism is restricted and the idler mechanism does not mesh with the drive gear 24.

On the other hand, the lower idler mechanism is free from the restriction imposed by the lower control plate, and the lower idler mechanism meshes with the clutch gear 24 to rotate the drive gear 24 via the clutch mechanism, and the reel stand 1 is rotated at the set torque and set rotation speed. Rotate. Here, since the drive gear 2'4 is rotated via a clutch mechanism, there is always a constant relationship between the rotation speed of the reel stand 1 and the rotation speed of the clutch gear 24 whose rotation is directly transmitted from the drive source. This creates a second transmission system.

Next, how these two transmission systems are actually selected and how they operate will be explained.

FIG. 8 shows the state of tape fast forwarding and rewinding operations of the magnetic recording/reproducing device. If the upper and lower idlers are overlapped, it becomes difficult to see, so FIG. 8(b) shows the top of the idler mechanism as a plan view of the upper layer, and FIG. 8(a) shows the bottom of the idler mechanism as a plan view of the lower layer. In reality, as is clear from FIG. 7, the transmission gears 29 are in a coaxial position.

First, a mode selection mechanism (not shown) is activated, driving the upper control plate and the lower control plate 36. The control plate stops at the position shown in FIG. 8, and the restriction on the idler mechanism is released. At the same time, the lower control plate moves to the position shown in FIG. 8 to limit the operation of the lower idler mechanism.

Here, the first transmission system is selected. When the relay gear 29 is driven by the drive source in this state, the torque and rotational speed of the drive source are directly transmitted to the reel stand 1 according to its reduction ratio, and the magnetic recording and reproducing device performs fast forwarding or winding. Perform the return operation.

FIG. 9 shows the braking mode. In addition(,)
is a plan view of the lower layer, and symbol) is a plan view of the upper layer.

In the tape fast-forward mode shown in FIG. 8, the upper and lower parts of the control plate first move toward the restriction side in order to separate the upper and lower parts of the idler mechanism from the reel stand 1. (Direction of arrow E in Figure 9) Next, when the driving force from the driving source is applied, the separated reel stand 1, driving gear 22, and clutch gear 24 try to rotate by inertia, but the braking that operates together with the upper and lower control plates Since a mechanism (not shown) comes into contact with the reel stand 1 and applies a braking force, the reel stand 1, drive gear 22, and clutch gear 24 are stopped.

FIG. 10 shows the recording and playback modes.

Similarly, (a) is a plan view of the lower layer, and 0)) is a plan view of the upper layer.

First, the mode selection mechanism (not shown) shifts to the recording/reproduction mode, and the lower part of the control plate operates from the restriction mode to the release mode (in the direction of arrow F).

On the other hand, the control plate remains in restricted mode, so
It does not work on the idler mechanism. Here, the second transmission system is selected, and as described above, it becomes possible to run the tape at a constant speed and wind the tape with a constant torque.

Problems to be Solved by the Invention However, the above-mentioned configuration has the disadvantage that two sets of idler mechanisms are required, resulting in a complicated structure and a large number of parts. Furthermore, since the two sets of idler mechanisms are in upper and lower layers, the thickness hl of the reel drive mechanism is relatively large.
This has been an obstacle to making magnetic recording and reproducing devices smaller and thinner.

In view of the above-mentioned problems, the present invention provides a magnetic recording/reproducing device that has a single idler mechanism, which simplifies the device, and also allows the device to be made thinner.

Means for Solving the Problems In order to solve the above problems, the magnetic recording and reproducing apparatus of the present invention includes a reel stand for mounting a tape, first and second drive gears for driving the reel stand, and In a reel drive mechanism that includes an idler that drives the reel stand via a first or second drive gear, at least one of the first and second drive gears is arranged relative to the rotation axis of the drive gear. It is movable in the vertical direction, and has a configuration in which one of the first or second drive gear selectively engages with the idler to drive the reel stand.

Operation According to the above-described structure, the present invention has a single idler mechanism, which not only simplifies the structure and reduces the number of parts by two, but also allows the device to be made thinner. Also, the first
and by selectively moving the second drive gear,
This means that it can have the same functionality as the conventional one.

Embodiments Hereinafter, magnetic recording and reproducing apparatuses according to embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a plan view of a main part showing a reel drive mechanism of a magnetic recording/reproducing apparatus according to an embodiment of the present invention, FIG. 2 is a sectional view showing a meshing state, and FIGS. 3 to 5 are for explaining the operation. FIG. In Figure 1, 1 is a tape (not shown)
3 is coaxial with the reel stand 1 and transmits rotation and torque to the reel stand 1 via the clutch mechanism. 4 is a part of the clutch mechanism, and the clutch gear 2 is a clutch spring that generates frictional force between it and the clutch gear 3, a clutch felt that is set and transmits the rotation of the clutch gear 3 to the reel stand 1 with torque, and 5 is integrated with the reel stand 1. This is a stopper gear that integrates the clutch mechanism provided on the reel stand, and directly transmits the rotation speed and torque to the reel stand 1. These 1°2.3 and 4.6 constitute a clutch mechanism in the reel stand 1, and when the clutch gear 3 is driven, a constant torque is transmitted to the reel stand 1. Also reel stand 1
The rotation speed can be arbitrarily selected as long as it is lower than the rotation speed of the clutch gear 3.

7 is a first drive gear provided to indirectly drive the reel stand via a clutch gear, 6 is a first drive gear shaft which is the rotation center of the first drive gear, and 8 is a fixed first drive shaft. death,
and a drive plate that supports the first drive gear; 9 is a second drive gear provided to directly drive the reel stand via a stopper gear; 15 is a relay gear that transmits rotation from a drive source such as a capstan; Reference numeral 10 is on an idler gear that meshes with the first drive gear 6, which is provided to indirectly transmit rotation and torque from the drive source to the reel stand 1. Reference numeral 11 is coaxial with the idler gear, but it does not transmit the rotation and torque from the drive source. The lower part of the idler gear meshes with the second drive gear 9 provided to directly transmit information to the reel stand 1, the idler shaft 12 is the rotation axis of the upper idler gear 10 and the lower idler gear 11, and the reference numeral 13 supports the idler shaft and rotates the idler mechanism. An idler arm 14 serves as an arm during movement, an idler felt 14 generates friction force between the idler mechanism and the relay gear 15 and rotates the idler arm 13 with a set torque, and an idler spring 16 generates clutch force. , 17 is a sleeve provided to integrate the idler mechanism, rotatably supports the relay gear 16, and fixes the idler arm. 18 is a board on which mechanical parts of the device are mounted;
A reel shaft 20 rotatably supports the reel stand 1 and is provided on the substrate 18; 20 rotatably supports the second drive gear 9; a drive shaft 21 is provided on the side of the substrate 1;
The idler shaft is also provided on the board and is the center of rotation of the idler mechanism. Also h2
indicates the configuration height of the reel drive mechanism.

The operation of the reel drive mechanism of the magnetic recording/reproducing apparatus according to this embodiment configured as described above will be described below.

First, the driving operation of the reel stand 1 will be explained using FIGS. 1 and 2. First, the drive plate 8 moves to the setting state of each mode provided in the magnetic recording/reproducing device, and the state shown in FIG.
Selected to mesh with 1. In this state, the upper idler gear 10 and the first drive gear 7 never mesh with each other, which constitutes a second transmission system. Next, rotation and torque from a capstan or reel motor (not shown) are transmitted to relay gear 15. The rotation and torque transmitted to the relay gear are 11 degrees below the idler gear and 9 degrees below the second drive gear. Stopper gear 5. It is directly transmitted to the reel stand 1.

Next, the first transmission system will be explained. First, the drive plate 8 moves to a position where the first drive gear 7 and the idler gear upper 1o selectively engage (the fifth
(see figure). This state is the first transmission system, and the second drive gear 9 and the lower idler gear 11 never mesh.

Next, the capstan or reel motor (not shown)
The rotation and torque from is transmitted to relay gear 15. The rotation and torque transmitted to the relay gears are transmitted to the upper idler gear 10, the first drive gear 7, the clutch gear 3. It is indirectly transmitted to the reel stand 1 via the clutch mechanism.

In this way, it is possible to select whether to drive the reel stand 1 directly or indirectly by only selectively operating the drive gear. Next, how are these two transmission systems selected?
And explain how it works.

FIG. 3 shows the state of tape fast forwarding and rewinding operations of the magnetic recording/reproducing device. First, the mode selection mechanism (
(not shown) is operated to move the drive plate and move the first drive gear 7 to the position shown in FIG. In this state, the idler mechanism engages with the second drive gear 9 and is therefore in a mode in which torque and rotational speed are directly transmitted as described above.

Next, the rotation and torque transmitted to the relay gear 16 are directly transmitted to the reel stand 1 according to its reduction ratio, and drive the tape with a sufficiently strong force to perform fast forwarding or rewinding of the tape.

FIG. 4 shows the braking mode. First, a mode selection mechanism (not shown) moves the drive plate 8,
The first drive gear 7 is moved to the state shown in FIG. In this state, the idler mechanism is moved leftward by the first drive gear 7 and cannot mesh with the second drive gear 9.

On the other hand, the first drive gear 7 is also stopped at a position where it does not mesh with the clutch gear 3 provided on the reel stand 1, and the rotation and torque from the drive source are cut off at the idler mechanism and the first drive gear 7. The reel stand does not rotate.

Next, the braking method of the reel stand 1 after this is the same as the conventional method.

FIG. 5 shows the recording and playback modes.

First, a mode selection mechanism (not shown) shifts to the recording/reproducing mode. At this time, the first drive gear briefly moves toward the center of the gear shaft, which is the direction B in FIG. 4, and then the drive plate 8
moves the first drive gear 7 to the position shown in FIG.

In this state, the idler mechanism meshes with the first drive gear 7, and therefore enters a mode in which torque and rotation are indirectly transmitted as described above. Next, the rotation and torque transmitted to the relay gear 15 are transmitted to the clutch gear according to its reduction ratio, and then transmitted to the reel stand via the clutch mechanism. This makes it possible to run the tape at a constant speed and wind the tape with a constant torque.

The operations shown in FIGS. 3 to 5 are also switching operations when changing from direct to indirect mode or vice versa. This is a necessary operation when disengaging gears that have been once engaged, or when re-engaging disengaged gears, and is a necessary operation when the gears are driven in an abnormally engaged state due to interference between the tips of the gears. This is something that cannot be prevented.

1st! To explain the operation of an il-movement gear, when a disengaged gear is moved in a direction perpendicular to the center of rotation of that gear to engage it, the gear is first moved just before the teeth are about to engage. in the direction that makes them try to engage with each other (
B direction) Move the gear while applying a constant force. This force may be a very small force, and may be a spring force (not shown) applied to the drive arm. After the mode transition, the gears rotate to achieve normal meshing. On the other hand, when trying to disengage the gears that are engaged, once in the direction of the center of rotation (-
(B direction) until the gears disengage, then move it. Through these operations, normal meshing can always be maintained.

Note that in the embodiment, the first drive gear is movable, but the second drive gear may be movable. Alternatively, both may be movable. Also, in the embodiment, only one direction of the reel stand is shown for the purpose of simplifying the explanation, but it is clear that there is also a reel stand in the other direction with the idler at the center. be.

Effects of the Invention As described above, according to the present invention, the drive gear provided between the idler and the reel stand is selectively operated in the direction of the rotation axis of the gear, thereby simplifying the device. This makes it possible to reduce the number of parts, and also achieves excellent effects such as the ability to make the drive section significantly thinner.

[Brief explanation of drawings]

FIG. 1 is a plan view of the reel drive mechanism of a magnetic recording and reproducing apparatus according to an embodiment of the present invention, FIG. 2 is a sectional view showing the meshing state, and FIGS. 3 to 6 are plan views for explaining the operation. ,
FIG. 6 is a plan view of a reel drive mechanism of a conventional magnetic recording/reproducing apparatus, FIG. 7 is a sectional view showing the meshing state thereof, and FIGS. 8 to 10 are plan views for explaining the operation. 1... Reel stand, 2... Clutch felt, 3... Clutch gear, 4... Clutch spring, 6... Stopper gear, 6・・・・・・
...First drive shaft, 7...11th X moving gear, 8.
...Drive plate, 9...Second drive gear, 1Q...Idler gear top, 11...
Idler gear lower, 12... Idler shaft, 13.
...Idler arm, 14...Idler felt, 15...Relay gear, 16...
・Idler spring, 17...Sleeve, 18...
... Board, 19 ... Reel shaft, 2o ...
... Drive shaft, 21 ... Idler shaft. Name of agent: Patent attorney Toshio Nakao and 1 other person +-
--Reel stand? --- Clutch felt Figure 1
3---- Kufufu 9゛ya 4-7uν+
/(Winter 5-・St γl (Gi V 6-・-51 axis of movement) a −m−1 t;

Claims (1)

[Claims] A reel drive mechanism including a reel stand for mounting the tape, first and second drive gears for driving the reel stand, and an idler for driving the reel stand via the first or second drive gear. and the first and second drive gears and at least one of the drive gears are movable in a direction perpendicular to the rotation axis of the drive gear, and one of the first and second drive gears selectively moves the idler. 1. A magnetic recording and reproducing apparatus, characterized in that the reel base is driven by meshing with the reel base.