JPH0724128B2 - Magnetic recording / reproducing device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention aims to cause a magnetic tape to wind around a cylinder to which a rotary magnetic head is attached so that the rotary magnetic head and the magnetic tape can be slidably contacted with each other to determine a predetermined video signal or the like. The present invention relates to a magnetic recording / reproducing apparatus such as a video tape recorder adapted to record / reproduce the information signal.

2. Description of the Related Art In recent years, magnetic recording / reproducing devices such as cassette type video tape recorders have become smaller and lighter, and means for pulling a magnetic tape out of a cassette and winding it around a magnetic head to simplify the machine. In general, the means for switching the operation in various modes and the means for crimping the pinch roller to the capstan are generally used as independent drive sources.

The configuration of the conventional example will be described below with reference to FIGS. 15 and 16. First, when the cassette 101 is mounted, the tape guide posts 102a and 102b, the inclined posts 103a and 103b, and the pinch roller 104 are inserted into the inside of the magnetic tape 105 that is passed as shown by the two-dot diagonal lines in FIG. It Next, the mounting of the cassette is detected by a switch (not shown), the loading motor 106 rotates, the rotation is transmitted to the worm wheel 108 that meshes with the worm 107, and the loading ring 110 rotates counterclockwise via the pinion gear 109. Let Further, the loading ring 111 is rotated clockwise by a two-step gear 112 that meshes with the pinion gear 109. A base 113a for fixing the tape guide post 102a and the inclined post 103a is connected to the loading ring 111 by a rod 118a, and a base 113b for fixing the tape guide post 102b and the inclined post 103b is connected to the loading 110 by a rod 118b. As a result, the tape 105 is gradually pulled out of the cassette 101 by the preceding tape guide posts 102a and 102b. Then, the drawn magnetic tape 105 is wound around the peripheral surface of the rotary head drum 114, and thereafter fixed at that position. After that, when the recording or reproducing mode is switched, the plunger 115 is activated, the pinch lever 116 having the pinch roller 104 is rotated clockwise, and the capstan 117 is pinched by the pinch roller 104.
The magnetic tape 105 is run at a constant speed by press-bonding, and desired recording / reproducing is performed. In the figure, 119,
120 is a pinch crimp spring holder arranged between the plunger 115 and the pinch lever 116, 121 is a pinch crimp spring arranged between the holders 119 and 120, and 122 is a cassette.
Tape guides 123 and 124 provided in 101 are a supply reel and a take-up reel similarly provided in the cassette 101.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, as described above, means for pulling out the magnetic tape from the cassette and winding it around the magnetic head, and braking means for braking the reel in various modes in the tape running state (not shown) Using an independent drive source for each of the means for crimping the pinch roller to the capstan can be downsized to some extent by simplifying the mechanism, but there is a limit to further downsizing, and each If an independent drive source is used for the operating means, the cost is high and the weight is heavy. Further, in the magnetic recording / reproducing apparatus in which each of the above means is operated by a single drive source, the space occupied by the mechanism for switching each of the operating means becomes large,
It was a big handicap for downsizing the device.

In view of the above-mentioned problems, the present invention provides a magnetic recording / reproducing apparatus that is compact, lightweight, and can be significantly reduced in cost by using only a cylinder, a driving unit, and a capstan driving unit as an actuator that causes the device to function. It is provided.

Means for Solving the Problems In order to solve the above problems, the magnetic recording / reproducing apparatus of the present invention comprises a rotary head drum driving means for rotating a rotary head drum provided with a rotary head, and a magnetic tape at a predetermined speed. The capstan drive means for giving rotation to the capstan transferred by, the operation mode switching means for switching the operation mode of the apparatus, the relative speed difference between the rotational speeds of the rotary head drum and the capstan are detected, and the relative speed difference is used to detect the relative speed difference. The rotary head drum drive means and the capstan drive means are provided with drive means for driving the operation mode switching means forward, reverse, or stopped.

The present invention detects the relative speed difference between the rotary head drum drive means and the capstan drive means by the above-mentioned structure, and causes the drive means to switch the operation mode of the device to the forward, reverse, or stop state by the relative speed difference. The device can be switched to tape loading, unloading operation, recording / playback, and fast-forward rewinding operation.

Example Hereinafter, a magnetic recording / reproducing apparatus of an example of the present invention will be described with reference to the drawings.

First, the tape loading means will be described with reference to FIGS.
It will be described with reference to the drawings. In FIG. 1, 3 is a cassette 2
Magnetic tape drawn from the device, 1 is a supply reel, 20 is a take-up reel, 4 is a rotatably supported tension post, and 5 is a rotatably mounted shaft (not shown) planted in the chassis. Supported P1 posts, 6 are full-width erasing heads, 7 and 11 are tape guide posts for pulling out the magnetic tape 3 from the cassette 2, and 8 and 10 are implanted facing the tape guide posts 7 and 11. It is an inclined post. 12
Is an impedance roller rotatably supported on the chassis, 13 is an audio erase head, 14 is an audio control head, 15 is a magnetoresistive head (MR head), 16 is a P4 post, and 9 is a rotary head (not shown). The mounted rotary head drum, 18 is a pinch roller that can be pressed into and separated from the capstan 17 to run or stop the magnetic tape 3, and 19 is a P5 post that is rotatably chassised,
21 and 22 are tape guide post holders, and 23, 24, 25 and 26 are rotating arms.

The cassette 2 is horizontally mounted and positioned on a plurality of positioning pins (not shown) provided on a substrate (not shown) such as a chassis. By mounting this cassette, the front lid (not shown) of the cassette 2 is opened. In this cassette mounted state, the magnetic tape 3 in the cassette 2 is passed as indicated by 3'in FIG.
By this cassette mounting operation, the supply reel 1 and the take-up reel 20 in the cassette 2 are engaged with the supply reel base 27 and the take-up reel base 28 arranged on the substrate, respectively.

In FIG. 2, 29 is a capstan motor that drives the capstan 18 at a constant rotational speed at a constant speed, 32 is a timing belt that transmits the rotational force of the capstan motor to the relay pulley 31, and 30 is attached to the capstan motor. It is a capstan school that was created. In addition, the rotation of the relay pulley 31 is rotated by the pulley A34 via the timing belt 33.
Be transmitted to. Reference numerals 35 and 36 denote loading gears that rotate the loading arms 26 and 24 in the direction of arrow A, and mesh with each other. The loading gear 36 also meshes with the drive gear 37. Further, the drive gear 37 is a cam pin 40 guided by a first cam groove 38a formed on the cam gear 38.
It also meshes with the sector gear 39 having the. Reference numeral 41 is a main rod that moves following the second cam groove 38b formed on the back side of the cam gear 38. This main rod
Along with the movement of 41, the operation mode of the magnetic recording / reproducing apparatus is switched and the pinch roller is pressure-bonded. Incidentally, 42 and 43 are guide pins of the main rod 41. 44 and 45 are guide grooves, 53 and 54, which are the paths of the tape guide post holder when loading the tape.
Is a V stopper that locks the tape guide holder. Reference numeral 47 is a rubber belt that connects a cylinder pulley 46, which is formed below the rotary head drum 9 and rotates integrally with the rotary head drum, and a pulley 48 having a mider gear. 49 is a miter gear that meshes with the miter gear portion of the pulley 48 described above, and is formed integrally with the worm 50. The area within the one-dotted line is the drive means that is a feature of the magnetic recording / reproducing apparatus of the present invention.

Next, the above-mentioned driving means will be described with reference to FIGS. In FIG. 2, 55 and 56 are idler gears B that mesh with the gear portions formed on the pulley 34, respectively.
Then, each is rotatably attached to an idler arm 58 which is rotatable coaxially with the rotation shaft 57 of the pulley 34. 52
Is a relay pulley that meshes with the external gear portion of the internal gear 59.

If the pulley 34 rotates clockwise, turn the idler gear
When the gear 55 meshes with the external gear of the internal gear 59 and rotates counterclockwise, the idler gear 56 and the relay gear 52 mesh with each other. In FIG. 4, reference numeral 60 designates a first planetary gear meshing with the first internal gear portion 59a of the internal gear A59 and the sun gear 61, and 62.
Is the axis of rotation of the sun gear. In FIG. 4, reference numeral 63 denotes a first output gear, which has a rotary shaft 65 of the first planetary gear 60 and is rotatably mounted around the rotary shaft 62. 66 meshes with the second internal gear portion 59b of the internal gear 59 and the internal gear portion of the second output gear 64 to form a differential gear mechanism. Also,
The second planetary gear 66 is configured to revolve around the rotation shaft 62 by the sun gear 61.

The internal gear 59 is configured to be rotatable around the sun gear 61. Reference numeral 51 denotes a worm wheel that meshes with the worm 50, and has a plane gear portion 51a that meshes with the sun gear 61. 67 and 68 are one-way clutches, each of which has a spur gear portion on its outer circumference. The first one-way clutch 67 meshes with the first output gear 63, and the second one-way clutch 68 meshes with the second output gear 64. The output shaft 69 of the one-way clutch has a spur gear 69a that meshes with the cam gear 38. 70
Is a substrate and 71 is a bearing of the output shaft.

The operation of the magnetic recording / reproducing apparatus configured as described above will be described below with reference to FIGS. 2 to 14.

The tape loading operation will be described first. FIG. 9 shows the state of rotation of the rotary head drum motor and the capstan motor when the operation mode of the magnetic recording / reproducing apparatus is switched. When the cassette is mounted on the main body of the magnetic recording / reproducing apparatus, the mounting of the cassette is detected by a detection device (not shown), which causes the rotary head drum motor to start rotating and the capstan motor to stop.
At this time, the sun gear 61 rotated by the rotary head drum motor 9 starts rotating counterclockwise as shown in FIG. 5, and the internal gear 59 rotated by the capstan motor 29.
Has stopped. Therefore, the first planetary gear 60 is the sun gear.
It starts to revolve counterclockwise around 61. This revolving movement causes the first one-way clutch via the first output gear 63.
At this time, which is transmitted to 67, the one-way clutch 67 and the output shaft 69 are in the idling state, and the rotation is not transmitted. At the same time, the second planetary gear 66 revolves counterclockwise by the rotation of the rotary head drum motor 9 because the sun gear 61 forms the bearing portion of the rotary shaft 66a (see FIG. 4). . The second planetary gear 66 integrally has a gear portion that meshes with the second internal gear portion 59b of the internal gear 59 and a gear portion that meshes with the internal gear of the second output gear 64, and the same number of teeth is provided. And the module is the same. The relationship between the number of teeth and the module may be different. The number of teeth of the second internal gear portion 59b of the internal gear 59 is 51, and the number of teeth of the internal gear portion of the second output gear 64 is 49. Therefore, when the second planetary gear 66 revolves counterclockwise while the internal gear 59 is stopped (the capstan motor is stopped), the internal gear portion 64a of the second output gear 64 is
The second planetary gear 66 revolves around the inner gear 59b.
And the internal gear 64a are rotated counterclockwise by the difference in the number of teeth (51-49). This rotation is transmitted to the second one-way clutch and is transmitted to the output shaft 69. At this time, the second one-way clutch is set in the locking direction.

The rotation of the output shaft 69 is transmitted to the cam gear 38 via the gear portion 69a formed on the output shaft, and the loading is completed as shown in FIGS. 10 to 12. After that, the main rod moves to the right by the second cam groove 38b formed on the back side of the cam gear (arrow Q in Fig. 2), passes the FF / REW position, reaches the STOP position, and moves to the overseas mode position. The detecting device detects the STOP position, and the rotary head drum motor 9 stops.

Next, the pinch roller pressing operation will be described. When the magnetic recording / reproducing device is switched to the recording / reproducing mode, the rotary head drum motor 9 rotates in the same manner as during loading, whereby the cam gear 38 rotates and the main rod 41 moves.
Moves to the right (arrow Q). 13 and 14 show the pinch crimping operation. When the main rod 41 moves in the Q direction, the pinch roller 17 contacts the capstan 18, and the main rod 41 moves in the Q direction. As a result, the pinch pressure spring is extended, and the pinch roller pressure force is generated. When the completion of the pinch crimping operation is detected, the capstan motor 29 starts rotating at a predetermined rotation speed. Here, as shown in FIG. 6, the operation of the driving means of the present invention at the time of recording / reproducing is that the first internal gear portion 59a of the internal gear 59 is rotated clockwise by the capstan motor 29, and the first planetary gears are rotated. 60 revolves counterclockwise. Therefore, the first one-way clutch idles. Further, the second internal gear portion 59b also rotates clockwise, whereby the second output gear rotates clockwise, and the second one-way clutch also idles. Therefore, the output shaft 69 does not rotate.

Next, the Cue / Rev mode will be described. Figure 7 shows Cue / Rev
It shows the movement of the switching mechanism of the present invention at this time, and the capstan motor 29 is rotating at a speed three times as fast as during recording and reproduction. Therefore, the first internal gear 59a rotates three times faster than in the case shown in FIG. 6, and the second internal gear 59b also rotates three times faster. At this time, since the rotation of the cylinder motor 9 does not change, the first planetary gear 60 and the second output gear 64
The internal gear part 64a of 1 is 1 for the recording / reproducing mode (Fig. 6).
Each gear specification is set so that the rotation direction does not change at a speed of / 3, the first and second one-way clutches 67 and 68 idle, and the cam gear 38 does not rotate. Also with Cue
In Rev, the rotation direction of the capstan motor 29 is reversed, but as shown in FIG. 2, when the capstan motor is rotating in the clockwise direction, the internal gear 59 and the idler gear 55 mesh, and in Rev, the idler gear 56 and The internal gear 59 meshing with the relay gear 52 always rotates only in the clockwise direction.

Next, the unloading operation will be described. In FIG. 9, when the magnetic recording / reproducing apparatus is switched to the unloading operation, the capstan motor 29 rotates and the cylinder motor 9 stops. At this time, the movement of the driving means of the present invention is shown in FIG. The positive gear 61 is stopped, and the first internal gear portion 59a is rotating clockwise. Therefore, the first planetary gear 60 rotates clockwise (first
Output gear 63 also rotates clockwise), and the first directional clutch rotates counterclockwise. At this time, the first one-way clutch 67 and the output shaft are locked and the cam gear 38 rotates,
The magnetic recording / reproducing apparatus is unloaded. The second
Of the planetary gear 66 stops, the internal gear 64a of the second output gear rotates in the same direction as the second internal gear 59b, and thus the second one-way clutch 68 idles. During the unloading operation, the supply reel stand 27 is driven by the capstan motor 29 to wind the magnetic tape 3 on the supply reel 1.

As described above, according to the present embodiment, the rotary head drum driving means for rotating the rotary head drum having the rotary magnetic head, and the capstan driving means for rotating the capstan for transferring the magnetic tape at a predetermined speed. And an operation mode switching means for switching the operation mode of the apparatus, a relative speed difference between the rotational speeds of the rotary head drum and the capstan, and the relative phase difference between the rotary head drum drive means and the capstan drive means. Therefore, a drive means for driving the operation mode switching means forward, reverse, or stopping is provided, and the actuator for supplying power to the magnetic recording / reproducing apparatus may be constituted only by the rotary head drum drive means and the capstan drive means. it can.

As described above, according to the present invention, the drive means (rotary head drum motor) for rotationally driving the rotary head drum having the rotary magnetic head as the actuator of the apparatus, and the cap for transferring the magnetic tape at a predetermined speed. Since it has only a capstan drive means (capstan motor) for driving the stun, and does not require a loading motor and a plunger for switching the operation mode of the conventional device, it is possible to greatly reduce the cost and reduce the size and weight. It is possible. Further, since the driving means of the present invention also serves as a speed reducing mechanism, the number of parts can be reduced. Furthermore, since the rotary head drum motor and the capstan motor with high rotational accuracy are used for switching the operation modes, it is possible to realize a device with less mechanical noise.

[Brief description of drawings]

FIG. 1 is a schematic plan view of a magnetic recording / reproducing apparatus according to an embodiment of the present invention, FIG. 2 is a plan view of the apparatus, and FIGS. 3 and 4 are plan views and sectional views of a switching mechanism of the apparatus. 5 to 8 are conceptual diagrams showing the operating state of the switching mechanism of the apparatus, FIG. 9 is a timing chart showing the operating timing of the apparatus, and FIGS. 10 to 12 show the loading operating state of the apparatus. FIG. 13 is a plan view showing a pinch roller pressure bonding operation of the apparatus, and FIGS. 15 and 16 are schematic plan views and front views of a conventional magnetic recording / reproducing apparatus. 1 ... Supply reel stand, 2 ... Cassette, 3 ... Magnetic tape, 4 ... Tension post, 5 ... P1 post, 6 ...
Full width erasing head, 7 ... tape guide post, 8 ... tilting post, 9 ... rotating head drum, 10 ... tape guide post, 11 ... tilting post, 12 ... impedance roller, 13 ... audio race head, 14 …… Audio control head, 15 …… Magnetoresistive head (MR
Head), 16 …… P4 post, 17 …… Pinch roller, 18
…… Capstan, 19 …… P5 post, 20 …… Take-up reel stand, 21,22 …… Tape guide post holder, 23,24,25,
26 ... Loading arm, 27 ... Supply reel stand, 28 ...
… Take-up reel stand, 29 …… Capstan motor, 30 ……
Capstan Coolie, 31 …… Relay pulley, 32,33…
... Timing belt, 34 ... Pulley A, 35 ... Loading gear A, 36 ... Rodin gear B, 37 ... Drive gear, 38 ... Cam gear, 38a ... First cam groove, 38b ...
2nd cam groove, 39 …… Sector gear, 40 …… Cam pin, 41 …… Main rod, 42,43 …… Guide pin, 44,45
...... Guide groove, 46 …… Cylinder pulley, 47 …… Rubber belt, 48 …… Pulley B, 49 …… Miter gear, 50
…… Worm, 51 …… Worm wheel, 52 …… Relay gear, 53,54 …… V stopper, 55 …… Idler gear A, 5
6 ... Idler gear B, 57 ... Rotating shaft, 58 ... Idler arm, 59 ... Internal gear A, 60 ... First planetary gear, 61 ...
… Sun gear, 62 …… Rotary shaft, 63 …… First output gear, 64
...... Second output gear, 65 …… Rotary shaft, 66 …… Second planetary gear, 67 …… First one-way clutch, 68 …… Second one-way clutch, 69 …… Output shaft, 70 …… Substrate, 71 ... Bearing, 72 ...
… Pinch arm, 73 …… Pinch pressure spring.

Claims (1)

[Claims] 1. A rotary head drum drive means for applying rotation to a rotary head drum having a rotary magnetic head, a capstan drive means for applying rotational force to a capstan for transferring a magnetic tape at a predetermined speed, and the operation of the apparatus. The operation mode switching means for switching the mode and the relative speed of the rotational speeds of the rotary head drum and the capstan are detected, and the operation mode switching means is operated by the rotary head drum drive means and the capstan drive means based on the relative speed difference. 2. A magnetic recording / reproducing apparatus, comprising: a driving unit that drives, reverses, or stops.