JPS5862858A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To always hold a proper engaged state with a pinion, and to exactly execute an operation, by supporting an idler gear for transferring the rotating force to 2 reel base gears, on a slide plate. CONSTITUTION:On the same axis as the rotary axial core of feed and winding reel bases 4, 3, reel base gears 4a, 3a of the feed side and the winding side are provided, respectively, and between these 2 gears 4a, 3a, a pinion 14 interlocked with an output shaft 7a of a forward and reverse rotation driving mechanism 7, and a slide plate 16 for supporting an idler gear 17 engaged with said pinion are provided. Between this slide plate 16 and a substrate 2 of a device body 1, a guide mechanism 18 for guiding the slide plate 16 is provided so that the idler gear 17 rocks in a state engaged with the pinion 14 between 2 mutual positions engaged with the feed or winding reel base gear 4a, 3a. Also, a rack 15 which feeds this idler gear 17 through the forward and reverse rotations of the pinion 14 is provided as fixed to the substrate 2.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic recording and reproducing apparatus, and more particularly to a magnetic recording and reproducing apparatus employing a cassette called a general audio cassette or a compact cassette in which a magnetic tape is housed in an 8-7.

As is well known, a magnetic recording/reproducing device consists of a supply reel stand that is connected to and removed from a reel installed in a cassette, a winding bias unit, and a normal direction cap that feeds the magnetic tape in the normal direction or rewinding direction. It is equipped with a stun shaft, a rewind direction capstan shaft, and a magnetic spatula F, among which auto-reverse types are used, for example, in car stereos. In such a magnetic recording/reproducing device, it is desired to simplify the configuration and downsize the device while maintaining reliability of operation.

However, in conventional devices of this type, each of the capstan shafts and capstan shafts were driven by separate drive sources, and the movement of the head toward and away from the magnetic tape was switched using a plunger. In addition to the particularly complicated structure of the drive system, there is also the problem of reduced reliability due to wear of the feeder and I+/) in those that employ a felt-based slip mechanism as the rotational force generating means for the reel stand. These factors hindered the miniaturization and price reduction of equipment. In addition, there was a system that reduced the number of drive sources by using a drive source that rotates in one direction, and transmitting power from this drive source to the reel stand and capstan shaft using a mechanical transmission mechanism. Even with this, a complicated mechanism was employed to change the rotational direction of the reel stand, etc., so it was not sufficient to simplify the structure or miniaturize the device.

This invention has been developed in view of the above circumstances, and is configured to transmit the output of a forward/reverse rotation drive mechanism to a supply reel stand and a take-up reel stand using an idler gear. It is an object of the present invention to provide a magnetic recording and reproducing device that can simplify the system and the overall configuration of the device and achieve miniaturization of the device.

Next, embodiments of the present invention will be described with reference to FIGS. 1 to 12.

Figures 1 to 4 are partially cutaway plan views for explaining each operating state of the magnetic recording and reproducing device, Figures 5 to 7 are plan views for explaining the same states, and Figure 8 is a normal view. A vertical cross-sectional view of the reverse rotation drive mechanism, FIG. 9 is a cross-sectional view taken along arrow 1-1 in FIG. 8, FIG. 10 is a cross-sectional view taken along arrow I-1 in FIG. 8, and FIG. 11 is a forward-reverse view. A characteristic diagram of the rotational drive mechanism, FIG. 12 is a bottom view of the capstan shaft drive system.

In FIGS. 1 to 7, (1) shows the main body of the magnetic recording/reproducing apparatus, and its substrate (2) has a take-up reel stand (3), a supply reel stand (4), as in the conventional case. and each capstan shaft (5), (6) in the normal direction and return direction.
They are set up facing each other. In the illustration, the take-up reel stand (3) is connected to the take-up reel stand gear (3&
), and a supply side reel stand gear (4a) is integrally formed on the supply side reel stand (4) coaxially with the respective rotation axes. And two gears (jS &)
, (4&) The output shaft (7&) of the forward/reverse rotation drive mechanism (γ) is arranged at Dli.

As is clear from FIGS. 8 to 10, the forward/reverse rotation drive mechanism (7) has both the functions of a synchronous motor and an Eddy current screw machine,
It is attached to the back surface of the substrate (2).

That is, the insulating coil housing (8) screwed onto the substrate (2) has a bearing (9) integrally in its center,
This bearing (9) has a required number of I/I' and magnetic flux detection elements (1υ) in a predetermined positional relationship surrounded by J.
9) is rotatably fitted with an output shaft (7 &),
A tenth rotor (b) consisting of a rotor disk (12m) and a rotor magnet (12b) is fixed to the lower end of this output shaft (7&). The rotor disk (12 m) is composed of an electromagnetic soft iron plate and has gear grooves (not shown) carved around it, which enable rotation speed detection by electromagnetic or optical methods. Narutomo K.

It becomes possible to obtain a control signal for controlling the rotation speed. Further, as is clear from FIG. 10, the rotor magnet (12b) is alternately magnetized to N and G poles at every 45 degrees of mechanical angle, and the rotor disc (12&) serves as the magnetic circuit of the rotor magnet (12b). Also serves as

The motor described above operates as a so-called synchronous motor, and the magnetic flux of the rotor magnet (121t) is detected by the magnetic flux detection element (\), and the magnetic flux of the rotor magnet (121t) is detected by the control circuit (not shown). When a driving current is supplied, the first cylinder rotates.In this case, an external synchronization signal and a control signal detected from the rotor disk (12a) by an electromagnetic or optical known method are compared. By controlling the input of the coil member, it is possible to control the rotational speed of the 10th gear (B) or the output shaft (7&) to a desired value.To reverse the rotational direction of the output shaft (7&), adopts any known means of reversing the polarity of the magnetic flux detection element (1υ).

Next, (b) is the 20th ta, which is a material with eddy current characteristics such as an electromagnetic soft iron plate, or a material with hysteresis magnetization characteristics such as a hard magnetic material, and is shaped like a disk. It also serves as a magnetic circuit for the spatial magnetic flux from the rotor magnet (12b), which is opposite to the rotor magnet (12b). The 0 shaft is made of a pinion, made of low-wear plastic, etc., and is formed integrally with the 20th gear (b), and has a free shaft in its center relative to the output shaft (7 &). It has a bearing part so that it can rotate. The output shaft (7a) is rotatably supported in contact with a stepped end face (7b) formed at the center of the output shaft (7a).

Therefore, an attractive force due to magnetic force acts between the binion (2) to the 20th rotor (2) and the rotor magnet (12b), and this attractive force causes the 20th rotor to (7b) and the pinion), and a constant frictional force will be generated between the contact parts. In other words, in order to rotate the 10th-ta (b), a carp/
If a driving current is supplied to I/-, the 2nd 4th direction (B) will be induced by the rotating magnetic field at the same time as the 10th direction (B) rotates, and the 2nd direction (B) will be induced by the rotating magnetic field. Roll 11.

The above-mentioned motor operates as a so-called Eddy current electric motor. When the 10th motor (B) rotates, the 20th motor (B) produces an Eddy current torque or a hysteresis torque. The type of torque (depending on the material constituting the 20th-ta (b)?), which is the addition of both, differs. ) is generated, and a rotational torque in the same direction as the rotational direction of the 10th ta (b) is generated at the 20th ta (e). Moreover, since a frictional force is generated between the 20th gear (b) and the stepped part end surface (7b) of the output shaft (7a) due to magnetic attraction, the 1st
The rotational torque of the 0-ta (b) is transmitted to the 20-ta (b) via the output shaft (7&).

In this way, M20-ta (to) has the 10th-ta (ro)
A composite torque of the rotational torque in the same direction as the rotational direction of and the rotational torque of the tenth motor transmitted through the frictional force with the end surface (7b) of the useful part acts.

The relationship between this composite torque and the relative rotational speed is shown in FIG. Here, the relative rotational speed refers to the 10th (b) and the 2nd
It means the difference between the rotation speed of 0-ta (b).

In FIG. 11, part a is a torque component based on frictional force, and torque is generated regardless of the relative rotational speed. It is a torque component that is electromagnetically generated at 2°-2 (to), and the generated torque increases in proportion to the relative rotation speed. As can be seen from this, it is possible to obtain almost constant torque regardless of the rotation speed from the rotational force obtained by working on the It is clear that if it is used to drive the rotation of (3) or the unwinding side Lee μ stand (4), a more or less constant tape winding position P can be obtained.

As mentioned above, this rotational force can be taken out through the binion (2), and the rotational force is configured to be transmitted to the take-up side reel stand (3) or the supply side reel stand (4), The winding torque of the magnetic tape can be made constant. Therefore, a rack (b) is fixed to the base plate (2) so as to face this pinion in an S-open state.

As shown in Figures 1 to 4, the slide plate α is placed on the base plate (2) between the binion (6) and the rack (B).
6) is provided, and an idler gear 〇η is rotatably supported on this slide plate). A guide mechanism (b) is provided between the slide plate 06) and the substrate (2). Specifically, this guide machine W (g) has a pair of left and right arc-shaped guide holes (18a) formed in the slide V play (16), and this pair of guide holes (18m).
The left and right sides protruding from the board (2) so as to fit into the
It consists of a protruding bin (s8b) of goods. This guide mechanism (
(g) is useful for swinging the -displacement idler gear (b) to the left and right at o+iB while keeping the distance between its center planes at one point.

In other words, as shown in #M1-, the idler gear (
(b) The winding bias is determined by both the above-mentioned binion (2) and rough # (2) at the central part ν between the N gear (5&) and the feeder kI @ Lee gear (wisteria). They are arranged so that they mesh with each other, but from this state, when the pinion (binion) is rotated in the square l# (counterclockwise direction) as shown by the arrow M, the idler gear (b) rotates clockwise accordingly. The winding bias 1 is swung in the direction approaching the platform gear (5a) by kicking the number ivy (■). In this case, in order to cause the idler gear (b) to swing while being meshed with the binion 044, a gear V mechanism m- is provided. When turning the Binion 0 in the opposite direction (clockwise) by 1g, the result is J. An idler gear like this J)
The swinging of (B) must be performed between the position where this idler gear (B) meshes with the take-up side reel stand gear (5&) and the position where it meshes with the supply side reel stand gear (4&). be. In that case, it is desirable to obtain the most appropriate meshing condition when the idler gear (B) is located at the left and right swing limit.1°For this purpose, the stopper mechanism (B) and the plate The flange mechanism (b) is provided with a pair of left and right protruding pieces (19&) provided on the slide frame),
It consists of a locking piece (19b) provided on the substrate (2) opposite to these protruding pieces (19&),
By swinging the idler gear αη in the forward or reverse direction, the corresponding protruding piece (19m) and locking piece (19
When the idler gear CL?
)-1tE is set to mesh with the winding bias gear (5z) on the order of 1μ or the supply side reel gear (4a) with the reel at its swing limit and with the eel also in an appropriate state. In addition, the plate link Sakaki has a bottle in its center, and a board (2
), and a locking pin (
23&/) are fitted and held in elongated holes (23+) formed in the slide plate). Further, the plate link (2) is provided with a pin on one side of the support portion by the bottle (2), and the pin () is opposed to the first cam part of the cam plate link. In the state shown in FIG. 1, this first cam member has two cam surfaces (25&) and (2513) that face each other from the side of the cylindrical member (c) and are symmetrical to each other. Therefore, when the slide plate (B) swings to the left or right along with the idler gear αη in response to the forward or reverse rotation of the pinion α, the slide plate (B) is connected to the slide plate (B) via the lock pin (23 m). When the cam plate (c) is moved forward immediately after the cam plate (c) is moved forward, the first cam portion The rock is made to follow either of the cam surfaces (25a, 25b) of the idler gear (b), and the swinging continues even after the idler gear (b) is separated from the cam surface (25a) or (25b) of the idler gear (b). Then, the stopper mechanism (
(b) The most appropriate meshing state is set.

Next, a positioning mechanism for the idler gear (b) is provided between the plate link (b) and the board (2).

This positioning mechanism has the pair of legs of the tension spring (26a) locked to the bin A facing the cut and raised pieces (26b) of the plate link from both sides, and the base plate (2). A fixed piece (26a) provided is made to protrude between the pair of legs. This positioning mechanism) always urges the plate link () in the direction of restoring it to its original state, the state shown in Figure 1, when the plate link (2) swings from side to side. Therefore, the idler gear (b) is also always urged in the direction of returning to the neutral position shown in FIG.

On the other hand, pinch rollers (c) and #4 are provided for the pair of capstan shafts (5) and (6), respectively. This pinch roller (c) is mounted on a support shaft protruding from the board (2).

-The swinging arm is 0. A rotary support shaft -1- attached to the plate (b) via the plate (b) and the pinch roller (ii) is extended to the vicinity of the surface of the substrate (2). One end and the other end of the stopper plate (2) are allowed to move in and out of the swing path of the H circumference on the support shaft of these rotation support shafts -0 (B). That is, this stopper plate is held by the guide mechanism so as to be slidable from side to side on the substrate (2), and its longitudinal center portion is attached to the plate plate (2).
It is locked by a locking pin provided at the other end. Therefore, the stopper plate (2) slides to the left or right in conjunction with the plate link () swinging to the right or left, and selectively extends one end or the other end into the swing path. Make them retreat.

Next, ELL and III indicate braking mechanisms, which are provided corresponding to the take-up side reel stand gear (3&) and the supply side reel stand gear (4a), respectively.

Braking mechanism corresponding to the take-up side reel stand gear (3 &) -
In this case, the bent part of the inverted dogleg-shaped swinging piece (58m) is the base plate (2).
A rubber brake shoe (38a) as an operating part is attached to one end of this swinging piece (48m), and a jinko (584) is attached to the other end of the swinging piece (48m). When provided, the playing shoe (38c)
A spring (58) is interposed between the rocking piece (38a) and the base plate (2), which always biases the winding bias in the direction of pressing the gear (3a) on the order of 1μ. Supply side - p gear (4
The braking mechanism corresponding to &) is arranged symmetrically with respect to the braking mechanism. That is, (39&) is a rocking piece, (
59b) is the support shaft, (59a) is the brake shoe, (39
d) is a pin, and (39θ) is a spring.

Sakaki is a control mechanism for switching the operating state of the braking mechanisms (1) and -. This control mechanism A includes the above-mentioned cam plate (b), a cam plate drive mechanism for moving the cam plate (b) in and out, a position detection mechanism for the cam plate Q◇, and a manual control mechanism for moving the cam plate ψ◇. It consists of a manual mechanism for moving in and out.

In the illustrated example, a manual dial is shown as the manual mechanism.

The cam plate ψ is disposed above the plate printer 2 so as to cover it, and is held by the guide mechanism 2 so as to be slidable left and right on the base plate (2). Then, on this cam plate), on the above-mentioned first cam part)
In addition to the above, Mitsuko (384) of the forward braking mechanism-1-, (
39d), two second cam parts (45m), (
a5b). These ♀ cam parts [45 & χ (4
5b) has three valleys, m, n and three peaks I.

y, 51 alternately, Tanibe Ri, group nK
When the above-mentioned Mitsuko (38d) and (39cL) are moved, the brake shoes (58G) and (396) are moved to the winding side by the bias of the springs (38・) and (39・).
Platform gear (3&) and supply deviation 1μ platform gear (4a)
On the other hand, when the ridges (38d) and (59d) are pressed against the ridges x, y, and z, the ridges (58el (59e) Brake shoes U8o), (39c) are attached to each gear (3a), (A
m) and becomes inactive.

In addition, the cam plate drive mechanism ←◇ includes a worm (b) that is linked to a motor @ that can rotate in forward and reverse directions, a worm wheel yv% that engages with the worm ←, and a worm wheel lL that engages with the worm wheel yv%.
It consists of a pinion () which is integrally provided with the cam play (c), and a rack (c) which is formed at the rear end of the cam play (c) and engages with the pinion.

Furthermore, the cam plate position detection mechanism includes magnetic pieces (51a), (51b), and (51c) provided at the rear end of the cam plate (b) in three vertical stages in a predetermined positional relationship.
) and limit switches (52m), (52b), (5
Consists of 2a). Therefore, depending on the entry and exit movements of (come play),
(52b), (52a) Each magnetic piece (51 & 1 (51
b), (51a), thereby each limit switch (52a), (52b), (
52o) are switched individually, and in accordance with this operation, the cam plate drive mechanism 00 is started or stopped.

Next, in FIGS. 5 to 7, FIG. 5 corresponds to FIG. 1, and FIG. 7 corresponds to FIG. 1. In these (5
3) is a magnetic spatula), (54) is this magnetic head (
53) and the head plate on which the erasing head (55) is attached. The head plate (54) is arranged so as to cover the upper surface of the cam plate Q1), and is provided at each corner of the head plate (54).
6), the cam plate Qυ is configured to be able to reciprocate on the front ε substrate (2) in a direction perpendicular to the sliding direction of the cam plate Qυ.

Further, a spring (57) is interposed between the head plate (547, !: base plate (2)) and the head plate (54), which is always biased in the backward movement direction. Furthermore, a pair of cut and raised pieces (5B&), (58b) and (59&'), (58b) and (59&') on the left and right sides of the front edge of (54)
9k)) are provided, and these cut and raised pieces (58m),
Springs (60) and (61) are locked between each of (58b), (59a) and (59b) from the outside. And, with respect to the springs (60) and (61), the swinging arm of the pinch a-ra), υ) and the spring receiving piece (
62) and (63) are provided. Furthermore, (58o),
(59o) Cut-and-raised piece supporting (60), (6t), (64).

(64), (65), (65), (66), (
66) are respectively on the supporting shaft).

■, Capstan shafts (5), (6) and pinch roller (ζ or (2) rotation support shaft -, - are head play) (
This is a through hole to avoid interference with 54). In addition, in the center of He'7 ¥Fre) (54), Mitsu (6
8) is provided, and this part (6B) is made to follow the third cam part (69) provided on the cam plate Q0. This third force unit 5 (69) is connected to the two second cam units (
45&) and (45b), an intermediate stage section (69&) for cueing and a final stage section (69b) for recording and reproduction.
and has.

Here, the first cam part (c), the second cam part (45 &), (45b) and the third cam part (69
) determines the operation timing of each element.

In FIG. 12, the lower ends of the capstan shafts (5) and (6) have a boot IJ (
70) and (71) are fixed respectively, while a pulley (
72) di These three Boo! J
A transmission bell (73) is hung between (70) and 02).

Next, the operation will be explained.

FIGS. 1 and 5 show how the cassette 0 is attached to and removed from the main body (1) of the magnetic recording/reproducing apparatus. In other words, the idler gear (b) is engaged with both the pinion) and the rack (b) tonneau by the action of the positioning mechanism (c), the take-up side v-yv stand gear (3 &) and the supply side reel stand gear (4 & ) is held in a neutral position where it does not mesh with any of the Therefore, the stopper plate (2) is also held at a position where it does not protrude into the swing path of any of the rotation support shafts (35), (34). Also, cam plate Q
1) is held at its retracting limit by the cam plate drive mechanism, and its first cam portion (C) is cut off from the end of the plate link (C). Furthermore, the brake machine ":"ls-'s Mitsuko C3ad).

(39a) is the second cam part (45&), C45b),
1st valley tK imitated, head play) (54)
The ridge (68) is made to follow the trough of the third cam part (69). Therefore, the braking mechanism -0- is activated and brakes the take-up reel stand (3) and the supply reel stand C], and the head plate (5 mm) or the magnetic spatula y (53) is positioned at the backward limit. do.

After loading the cassette O, for example, if the magnetic tape is fast-forwarded in the normal direction, the tortoise state is shown in FIG. In other words, in this case, as the binion (2) rotates in the direction of arrow A due to the start of the forward/reverse rotation drive mechanism (7), the idler gear (B) rotates and kicks the rack (B), causing it to jam. 9 rack (b) is applied, and it swings in the direction approaching the take-up side reel stand gear (3a). Along with this, the plate link) swings in the direction of time Mt against the bias of the positioning mechanism -, and at the same time the cam play) drive mechanism α
The engine starts and the cam plate (2) moves forward in the direction of arrow B. The second force (Aha) of the cam plate (2), (
45b), a braking mechanism 031. When the child (38(1), (391)) is copied, the first magnetic piece (51a) of this cam plate (2) kicks the corresponding limit switch (52m). , the operation of the cam plate drive mechanism (b) is stopped by the position detection signal.At the same time, the plate link mechanism (c) is made to follow the first cam part (2), so that the idler gear ( B) separates from the rack (B) and meshes with the take-up side reel stand gear (3a), and continues to rotate in this state.As a result, the take-up side reel stand gear (5 &) rotates in the direction of arrow O. Then, the magnetic tape is rapidly forwarded in the normal direction.

Figures 6, 3, 4, and 7 show the state when the magnetic tape is fast-forwarded in the normal direction, stopped at a predetermined position, and then recorded and reproduced in the normal direction. 1, that is, when the cam plate Qυ is advanced by starting the cam plate drive mechanism (B), the braking mechanism (2) is activated as shown in FIG.

- Mitsuko (313a), (59a) is the second cam part (4
5m) and (45b) and enter the operating state, the fast forward multi-rotation of the take-up reel stand (3) and the supply reel stand (4) is stopped and continues. As the force moves forward, the second plate moves forward, as shown in Figure 3.
The above-mentioned Mitsuko (384), (39 (1)) are made to follow the second peak y of the cam parts (45&), (45b), and the braking state is released.The cam play (c) continues thereafter. Continuing to advance further, as shown in FIGS. 4 and 7, the said Mitsuko (38d).

(394) is made to follow the third peak portion 2 of the second cam portion (45m) and (45b). In this state, cam plate QI
) is detected by the third limit switch (52o) and the corresponding magnetic piece (51o), and the detection signal stops the operation of the cam plate drive mechanism (b),
The forward motion of the cam play) also stops. In this state, the braking state for the 1μ winding bias gear (3&) and the supply reel gear (4a) is released.

On the other hand, during the series of operations described above, head play)
The pin (68) of (54) is sequentially made to follow the intermediate stage part (69m) of the fifth cam part (69) and the final stage part (69b).

Therefore, the magnetic head (53) moves forward together with the head plate (54) as shown by the arrows in FIGS. 6 and 7 to perform cueing, and the magnetic spatula (5M) comes into contact with the magnetic tape. Also, as the head play) C54) moves forward, the springs (60) and (61) provided in K pinch the springs of the four-ra swinging arms eo and m. Press the pinch roller V while it is in contact with the receiving pieces (62) and (63). In this case, the support shafts (C) and - move together with the head plate (54) while being locked to one end edge of the square holes (66) and (66).
Since one end of the stopper plate projects into the swinging path of the rotating support shaft in the stopper plate and engages with the support shaft, the biasing also causes the pinch roller in the unwinding direction to Swinging is prevented before it comes into pressure contact with the capstan shaft (6). Hence the head play)
(54) reaches the limit of movement, only the pinch roller (in the normal direction) is elastically pressed against the capstan shaft (5). This state is shown in FIGS. 4 and 7.

In the states shown in FIGS. 4 and 7, the magnetic tape is fed in the normal direction according to the rotational speed of the gear stand shaft (5), and the take-up side - μ stand (3) and the supply side reel stand (4) are It rotates in synchronization with the winding speed and feeding speed of the magnetic tape, and the winding top p at that time is constant.

That is, the output of the forward/reverse rotation drive mechanism (7) taken out by the pinion (b) is the above-mentioned composite Fμ output,
This is because if the rotational speed of the 112th rotation (b) is constant, it is always constant.

Above, we have explained the case where the magnetic tape is fast forwarded in the normal direction and then steadily fed in the same direction. However, in this type of magnetic recording/reproducing device, fast forwarding in the normal direction, steady forwarding, and stoppage are performed in the normal direction. , fast forwarding in the rewinding direction, steady forwarding, and stopping, as well as the beginning of the magnetic head (53), etc., are performed in any order. Therefore, as a countermeasure, when moving from one operation to the next, the cam plate (2) should be
It is desirable to have a configuration that returns the vehicle to the retraction limit as shown in FIGS. In addition, if it becomes necessary to take out micro cassette 0 due to a part (battery, etc.) running out while the magnetic tape is running, turn the manual die It, 1 dial of the manual mechanism (b). Return the cam plate to its retraction limit using
) and pinch rollers) and ), remove micro cassette 0, and then remove the idler gear (b) and take-up reel stand gear (
This manual mechanism is also used when adjusting the meshing with the reel base gear (4&) and the supply side reel stand gear (4&). That is, for example, as shown in FIG. 5, from the state in which the idler gear (b) is engaged with the take-up reel stand gear C5&), the cam plate ψυ is returned to the retraction limit by the manual mechanism and the take-up reel stand gear ( 3 &), and then perform the same operation on the supply side reel stand gear (4 &).

As is clear from the above description, according to the present invention, simply by switching the rotation direction of the output shaft of the forward/reverse rotation drive mechanism,
Since the rotational force in the normal direction and the rewinding direction is selectively and automatically transmitted to the supply side IL/stand gear and the take-up side reel stand gear, the rotational force is transmitted individually to each reel stand as in the past. Since the drive motor is provided in the drive motor, there is no need to provide a complicated transmission mechanism. Therefore, the drive system, and by extension the entire device, can be simplified in structure and downsized, leading to pressure to reduce prices. In particular, according to this invention, the above two v
-/Transmitting rotational force to the L' gear -7- The Luite Lugia is supported on the stopper plate, and this slide plate is guided by the guide mechanism provided between the board of the main body of the device. When the idler gear is oscillated by the scrap of the pinion interlocked with the output shaft of the forward/reverse rotation drive mechanism, the gear can always maintain a proper state of engagement with the pinion. Therefore, it is easy to obtain a proper meshing state with respect to the supply side reel gear and the winding bias gear of 1μ, and reliable operation can be expected.

[Brief explanation of the drawing]

The drawings show a magnetic recording/reproducing device according to an embodiment of the present invention, and FIGS. 1 to 7 are partially cutaway plan views for explaining its operating state, and FIG. 8 is a forward-reverse rotation drive. A vertical sectional view of the mechanism, FIG. 9 is a sectional view taken along arrows I- and I in FIG. 8, and FIG. 10 is a sectional view taken along arrows 171 and 1 in FIG.
Figure 1 is a characteristic diagram of the forward/reverse rotation drive mechanism, and Figure 2 is a bottom view of the capstan shaft drive system. (1)... Magnetic recording/reproducing device main body, (2)... Substrate, (3)... Reel stand for several turns, (3a)... Winding side reel stand gear, (4)... Supply side reel stand, (4a
)...Supply side reel stand gear, f5), (6)・-
・Capstan shaft, (7)... Forward/reverse rotation drive mechanism, (
7&)...output shaft, H...binion, (5)...
rack, ni)...slide plate, αη...idler gear, (g)...guide mechanism, (18a)
...Guide hole, (18b) ...Protrusion bottle (53).
...Magnetic head. In addition, in the figures, the same reference numerals indicate the same or corresponding parts. Agent Shin Kuzuno (1 other person)

Claims (1)

[Claims] (1) A supply side 9A/stand gear and a take-up side reel stand gear are provided coaxially with the rotation axes of the supply side reel stand and the take-up side reel stand, respectively, and forward and reverse rotation drive is provided between these two gears. A pinion that is interlocked with the output shaft of the mechanism and a slide plate that supports an eye gear that meshes with the pinion are provided, and the eye F luger is disposed between the slide plate and the board of the main body of the device. Supply bias-p
2 that meshes with the stand gear and the take-up side reel stand gear, respectively.
A guide V mechanism is provided to guide the slide plate so that it swings while being engaged with the pinion between the two positions, and is engaged with the eye F luger at the center between the two positions, and A magnetic recording/reproducing apparatus characterized in that a rack is fixed to the substrate, which feeds the eye-F luger to both sides through forward and reverse rotation of a binion.