JPS5936356A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To stabilize the operation of a magnetic recording/reproducing device, by driving a capstan and a reel driving disk and driving the reel driving disk by gears with a slip torque in a record/reproduction mode and with a synchronous torque in a fast forward/rewind mode respectively. CONSTITUTION:The slip torque of a motor is extracted by a pinion 12 and with forward revolutions of the motor in a record/reproduction mode. Then a reel driving disk 30b of the take-up side is revolved toward an arrow E. On the other hand, the synchronous torque is extracted by a pulley 8, and a capstan 15 is revolved toward an arrow F. Then a pinch roll 34 moves away from the capstan 15 in a fast forward/rewind mode, and a cam follower 45 hits an expanded part 46a of a cam 46. Therefore a gear 41 engages with pinions 12 and 40 at a time. Thus the synchronous torque is extracted from the pinion 12, and an idler 36 engages with a gear 37b. As a result, a satisfactory take-up torque is obtained. If such a way, a stable operation is secured for a magnetic recording/reproducing device.

Description

[Detailed Description of the Invention] The present invention relates to a magnetic recording and reproducing device, and more specifically,
This relates to a magnetic recording and reproducing device in which a magnetic tape in a chip cassette drawn out by a tape guide is wound around the outer periphery of a rotating dome containing a rotating magnetic head, such as those used in video tape recorders. .

Conventionally, when an electric motor is used to drive a video tape recorder, for example, the capstan shaft is made to correspond to the output shaft of the synchronous motor, and a separate motor is provided for the reel shaft that winds the tape to provide the drive source. Alternatively, the driving force was obtained from a synchronous motor via an idler or a belt. However, the former example requires two or more electric motors. Furthermore, in the latter example, the rotational speed of the capstan shaft and the rotational speed of the μ-axis do not always have a constant proportional relationship, so a mechanical sliding mechanism was required to rotate the reel shaft. However, the characteristics of these sliding mechanisms change over time, and there is a problem in that the driving torque is insufficient during fast forwarding and rewinding.

In order to solve the above problems, this invention uses one electric motor equipped with a synchronous torque output shaft and a slip torque output shaft, but the driving force of the reel stand in the recording/reproducing mode is outputted as a slip torque. This magnetic recording and reproducing device enables stable operation by obtaining the driving force from the synchronous torque output shaft, and obtains sufficient driving force for the reel shaft in fast forward and rewind modes by obtaining the driving force from the synchronous torque output shaft. is intended to provide.

Embodiments of the present invention will be described below with reference to the drawings.

First, a description will be given of an electric motor which is an example of a forward/reverse rotation drive mechanism (1) for driving a capstan shaft and a reel shaft in the illustrated magnetic recording/reproducing apparatus.

In Figures 1x to 13, there is a coil housing (2) made of an insulator such as plastic, and a substrate (3).
), and a bearing (4
) is formed, and the coil Iv (5) and the magnetic flux detection element (6) are held integrally.

The synchronous torque output shaft (7) has a pulley (8) integrally fixed to one end thereof, and is fitted to the bearing (4) so as to rotate freely. A rotor disk (9) is coaxially fixed to the pulley (8) with a rotor magnet θ1. This rotor disc (9) is made of, for example, an electromagnetic soft iron plate. Rotor magnet (10 is N at every 45 mechanical angle.

The rotor disk (9) also serves as a magnetic circuit for the rotor disk (In), which is alternately magnetized. The rotor 0υ, which is disc-shaped and made of a material with eddy current characteristics such as an electromagnetic soft iron plate, or a material with hysteresis characteristics such as a hard magnetic material, connects the magnetic circuit of the spatial magnetic flux from the rotor magnet θ1. Also serves as. This rotor 0υ is fitted to the synchronous torque output shaft (7) so as to rotate freely, and is integrally provided with a binion θ frame. Rotor magnet θ1 and rotor aυ
An attractive force due to magnetic force acts between them. This suction force generates a frictional force at the contact portion with the end surface of the stepped portion provided on the synchronous torque output shaft (7) (the rotor 01 facing (111N) 7). Here, the rotating body consisting of the rotor disk (9) and the rotor magnet OI is the first rotor, and the rotor 0υ
is called the 20th data. The 20th digit is the 1st.

It can rotate individually with respect to the rotor (11) and receives the above frictional force at the end face 04. Therefore, the 10th rotor (1
The rotational force of No. 4 is transferred to No. 7 through frictional force. Contributes to the rotational force of the n-taper O0.

In the following configuration, the magnetic flux of the rotor magnet (10) is detected by the magnetic flux detection element (6), and the control circuit (
If a drive current is supplied to the coil (5) by a coil (5) by a synchronous motor (not shown), it becomes a two-phase eight-pole synchronous motor, and the tenth motor (1, 1) rotates. Coil/L/(5
), the rotation of the tenth motors Q and I can be controlled to a desired rotational speed.

In this way, a synchronous rotational torque can be obtained for the rotor magnet (8). In addition, when it is necessary to reverse the rotation direction, the magnetic flux detection element (6
) can be achieved by a known method such as reversing the polarity of the polarity. Also, as mentioned above, the spatial magnetic flux of rotor magnet θ1 is the 20th
- A magnetic circuit is constructed by passing through the inside of the motor (11). When the rotor magnet 01 rotates, the 20th rotor (1) has different types of eddy current torque, hypostatic torque, or both (depending on the material of the disc constituting the second rotor). ) is generated, and rotational torque is generated in the 20th motor 01) in the same direction as the rotation of the rotor magnet θQ. At the same time, the friction force generated between the end face (7a) of the stepped part of the synchronous torque output shaft (7) and the end face 01a of the 20th motor (11) due to the attraction force between them causes The rotational force from is also added to the rotational torque of the 20th motor 01). The resultant torque generated in the 20th motor 01) in this manner can be taken out to the outside by the pinion θ) VC integrated with the 20th motor 01J. The torque generated at the 20th motor 0υ increases as the difference between the rotational speed of the synchronous torque output shaft (7) (synchronous rotational speed) and the rotational speed of the 20th motor α becomes larger.

The resultant torque and relative rotational speed (first
The relationship between
Shown in the figure. In the figure, the (4th part is a torque component based on frictional force and shows that torque is generated regardless of the relative rotation speed.0)) part is the torque generated electromagnetically at the 20th point θυ. The component υ indicates that the generated torque increases in proportion to the relative rotation speed.

The torque that can be extracted from the 20th motor (Ql) in this way (in conventional electric motors of this type, it is electromagnetic and mechanical loss that is not utilized for rotational force. The rotational force obtained by the magnetic tape θυ can obtain a nearly constant torque regardless of the rotation speed, so if it is used for the rotational drive of the magnetic cheaply μ, a nearly constant tape winding torque can be obtained and the machine It is possible to obtain stable long-life characteristics without the need for a sliding mechanism.

Here, the pinion θ acts as a slip torque output shaft.

Next, a description will be given of a magnetic recording and reproducing apparatus in which the above-mentioned electric motor (1) is provided as a drive source for a capstan, a spindle, and a reel axis θω), Q61)).

As shown in FIG. 10, the rotating drum 08) containing the rotating magnetic head θη is concentric with the fixed drum θ arranged at the bottom thereof and at a constant angle with respect to the substrate (3). It is arranged in an inclined state, and one end of the rotating shaft of the direct dofig motor (1) is fixed to this rotating drum (1→).

In addition, around the bottom of the fixed dolphin/θ frame, the board (3
), on which the inner and outer pairs of rings ■υ(a) are arranged concentrically.

As shown in FIGS. 7 and 8, the inner ring (2
I) has an external gear (gla) formed on a part of its outer periphery, while the outer ring (4) has an internal gear @3) formed on a part of its inner periphery. Then, between the inner ring Q0 and the outer ring), a pinion (1) is meshed with the external gear 018) and the internal gear (to)), and a guide is provided at the other two points. Laura Tsutomu) c! 4b) are interposed, and these make the inner and outer rings 3υ)
are supported at three points for concentric rotation.

Note that the pinion (21) is fixed to a rotating shaft (A) of a loading motor (not shown).

Next, as shown in FIG. 7, FIG. 8, and FIG. It is rotatably pin-coupled in one place ψD) and is erected at the free end of the swinging piece X (to) b). Therefore, due to the forward and reverse rotation of the pinion (A) accompanying the forward and reverse drive of the loading motor, this pinion (the inner ring Q1 meshing with 2G and the outer ring) is simultaneously rotated in opposite directions to #G. 2 are rotated by the same angle, and these rings + 21) (A) and 2 are attached to the tape guide)
G! 6b) are moved forward and backward while facing each other with the rotating drum θ frame in between. In this case, the forward movement of the tape guide
(g) b), each tape guide (b))
The driving of the loading motor is controlled to be stopped when (Xb) fully contacts these stoppers (G) (4) (see FIGS. 1 to 6).

On the other hand, as shown in FIGS. 1 to 8, a supply side reel stand (b) and a take-up side reel stand are placed on the substrate (3) at a location opposite to the rotating dobbler (1) and OF/3). is provided. In addition, the tape cassette (a) containing the supply -/l/(:(1,a) and take-up reel e rule has three notches 11&'lE1.) (L'31) between its front ends.
)■C), and when the tape cassette (c) is mounted on the board (3) in the stop mode of the magnetic recording/reproducing device, a pair of left and right tapes.

910) so that the guide)) (a) b) is accommodated in the notch (b)) (4) and the capstan θQ protruding onto the board (3) is accommodated in the other notch 910). It has become. The capstan θ (b), which is provided opposite to the capstan θ, is pivotally supported at its free end by a swing arm that is swingably supported by the base plate (3).

Next, the eyelet (g) consisting of the gears shown in FIGS. 1 to 6 is rotatably supported by a guide arm (not shown) attached to the base plate (3), and The 20th motor (evenly fixed pinion (6) of the electric motor (1)
), the knob υ, and the slip plate µ are configured to swing left and right while being engaged with the output shaft (+2a).

In other words, the mutual distance between the pinion (IJ) and the pivot center of the eyelid (chrysanthemum) is kept constant by the guide arm. As shown in FIG.
7a) (17b) is provided. Therefore, the above-mentioned gears ga) and CVb) have a connection position (see FIGS. 2, 3, 5, and 6) that selectively meshes with either one of these gears ga), CVb), and It will be swung forward and backward between the neutral position (see Figures 1 and 4) where it does not mesh with any of the elements, and in that case, a spring member (not shown) will provide elasticity in the direction of always maintaining the neutral position. Assume that it is energized.

Furthermore, a Fufuihoi/'110I is coaxially fixed to the capstan OQ corresponding to the pulley (8) of the electric motor (1), and these are interlocked by a belt.

Furthermore, the shoe-sochi mechanism shown in Figures 1 to 6 is
The above-mentioned pinion (12), the pinion (4) fixed to the synchronous torque output shaft (7) (see Fig. 11), and the gear 01 that is simultaneously engaged and disengaged from the pair of pinions (G). ). Then, the gear θ1) is
While the free end of the abbreviated swinging armoi 9 is pivotally supported on the substrate (3) at its intermediate portion, it is pin-coupled to the free end of the abbreviated oscillating armo 9, while the cam follower (■) of the cam mechanism described later is attached at its base end. Pivotally supported. In addition, a spring is stretched between the swinging arm θ stop and the board (3), and this spring causes the gear 0]) to always move in the direction in which it is separated from the pair of pinions θ cars. (Clutch opening direction).

Next, the mechanism is equipped with the cam follower ■ and the cam surface (4φ, and the cam surface ■ is attached to the above-mentioned outer ring).
is formed around the outer periphery of the Here, the above cam surface (T)
As shown in Figures 4 to 7, when the magnetic recording/reproducing device is set to fast forward 9 rewind mode, the tape guide (t) @
When b) is set to the position corresponding to the unloading state, the bulge θ) becomes the cam follower).
On the other hand, as shown in FIGS. 1 to 3, when the tape guide 06a) b) is set to the position corresponding to the loading state in the recording/playback mode, the recess □□□b) is configured to correspond to the cam follower.

In the above, in the recording/reproducing mode, as is clear from FIGS. 1 to 3 and 7, the rotation of the inner ring Q0 and the outer ring holder due to the rotation of the pinion (4) causes the tape guide to ) 7) (A) ■)) moves from the notch (E) (E) b) of the tape cassette (B) to the position shown in the figure, and as a result, the magnetic tape 0''f) is wound on the rotating drum (To). In addition, the swing arm is pressed against the capstan OQ at the same time.Furthermore, in this mode, the swing arm The gear θl) is displaced clockwise in the figure (arrow A in Figure 1) by the bias of the spring), and as a result, the gear θl) is displaced by the pair of pinions (RO).
(a) will be withdrawn from. That is, the Kufutsu mechanism is opened, and the synchronous torque output shaft (7) and slip torque output shaft (12a) of the electric motor (1) are separated. Note that the chrysanthemum is in a neutral position as shown in Figure 1.

Therefore, when the electric motor (1) rotates in the forward direction in the recording/reproducing mode, the slip torque is extracted by the pinion O operation, and as shown in Fig. 2, the idler The reel is swung to the right (arrow C) and meshes with the teeth if (t, ) of the take-up reel stand @1)), and in this state it is swung counterclockwise (arrow D).
This rotates the winding side! J-# stand X1l) is rotated clockwise (arrow ■bow) by the above slip torque. On the other hand, the synchronous torque of the electric motor (1) is taken out by the pulley (8) and transmitted to the capstan 0e by the belt) and the capstan 0e by the belt. 0 groan is rotated like arrow F. Through this series of motions, the magnetic tape head is run in the normal direction (arrow G). In this state, since synchronous torque is transmitted to the capstan 09, sufficient driving torque is provided to the magnetic tape θ for its running, while Since the slip)/ref is transmitted to the magnetic tape, appropriate tension is applied to the magnetic tape.
Stable recording and playback is achieved.

Further, when the magnetic tape θ is to be run in the rewinding direction in the recording/reproducing mode, the electric motor (1) is rotated in the reverse direction. As a result, the pinion (6) is rotated in the opposite direction (arrow H), so the idler) moves to the left and meshes with the supply side reel stand (E), and as shown in the arrow Rotate. Therefore, the supply side reel stand (the second reel) is rotated counterclockwise (arrow J).

Also, since the capstans θ are rotated counterclockwise (arrow K), the magnetic tape 07) is rotated in the rewinding direction (arrow L).
It will be run on.

Next, in the fast forward rewind mode, as is clear from FIGS. 4 to 6, due to the reverse rotation of the inner ring Qp and the outer ring (A) due to the reverse rotation of the pinion (C), The tape guide @8) @b) is set in the notch (E) (support) b) of the tape cassette (A). In addition, Vinchiro's position is separated from Capnutan's position. Furthermore, in this mode, since the cam follower (to) follows the bulge (2)■ of the cam surface), the swinging arm θ force is applied to the spring (
The clutch mechanism is swung counterclockwise against the urging force of the pinion (6), and as a result, the clutch mechanism is engaged with the pair of pinions (6) at the same time. state, and the synchronous torque output shaft (
7) and slip torque output shaft 0%) are connected continuously.

Note that the idler (chrysanthemum) is in the neutral position as shown in Figure 4.

Therefore, the synchronous torque extracted by the pinion of the synchronous torque output shaft (7) is transmitted to the gear II), the pinion θ'4, and the slip torque output shaft Q row in this order. However, as shown in Fig. 5, the idle drag → is on the order of 1 μ on the winding side (101) due to the forward rotation of the pinion with 0 rotation.
), when the gear meshes with the gear cutter, the take-up side reel stand ■l
is rotated clockwise by the synchronous torque, ensuring sufficient winding torque for the magnetic tape. As shown in Figure 6, the idler (
The same is true when η meshes with the tooth gear 07a) of the supply side reel stand (E).

Note that, as shown in FIGS. 1 and 4, the idler) is in the neutral position in the stop mode, that is, in the tape cassette attachment/detachment mode.

In the above, in order to increase the force that prevents the idler (G) from swinging between the neutral position and the connected position, apply W4 friction force between the idler (G) and its support shaft. , a hook mechanism may be provided.

In addition, the pinion OJ (g) and gear (
c) ((7a) cioIb) θυ may be replaced by one that transmits the rotational force by the frictional force of the outer peripheral surface of the rotating body. In this case, it is generally desirable to have a combination of a metal or glass cylindrical surface and a rubber tire (the outer periphery of the cylindrical surface is coated with rubber such as neoprene).As explained above, According to this invention, the capstan and the reel stand can be rotated by one forward/reverse rotation drive mechanism, and in that case, the rotation of the reel stand can be controlled by the slip)/reflex in the recording/reproducing mode, or by the Since the fast forward and rewind modes are operated with synchronous torque, the operation in each of the above modes is reliable and stable. Furthermore, since the torque is mainly generated electromagnetically, it has superior humidity characteristics and is more economical than conventional methods that use, for example, frictional force from felt.

[Brief explanation of the drawing]

1 to 3 are explanatory diagrams of the operation of the recording and reproducing mode in the magnetic recording and reproducing apparatus according to the embodiment of the present invention, and FIGS.
Figure 6 is an explanatory diagram of the operation in the fast forward/rewind mode, Figure 7 is a plan view of the tape guide drive unit corresponding to Figures 1 to 81\3, and Figure 8 corresponds to Figures 4 to 6. Fig. 9 is a plan view of the same drive unit, and a front view when the first silicon tape cassette is installed, Fig. 10.
The figure is a front view of the rotating drum part, FIG. 11 is a vertical cross-section of the electric motor (11), FIG.
The cross-sectional view shown in FIG. 14 is a diagram showing the relationship between slip torque and relative rotation speed of the electric motor. (1)... Forward and reverse rotation drive mechanism, (7)... Synchronous torque output shaft, 0■ [... Pinion of clutch mechanism, 0 (6
)...Slip torque output shaft, OQ...gear punutan, (1 gear...rotating magnetic head, θ frame...rotating drum, (B) (Xb)...tape guide, etc.)... Supply side reel stand, b)... Take-up side reel stand, (b)
...Tape cassette, (g)...Idotsu, ((7a
)@b)...gear, ＼...flywheel, ni)...
・Belt, cap)...gear of clutch mechanism, ■...cam follower, frame)...cam surface, first...magnetic tape. In addition, in the figure, the same reference numerals indicate the same or one hit part. Agent Makoto Kuzuno - (1 other person) Fig. 1 6 Fig. 2 6 ;z53 review 46 Fig. 4 Fig. 5 #S6 Fig. 7 Fig. 9 Fig. 8 Fig. 10

Claims (4)

[Claims] (1) A slip torque output shaft and a synchronous torque output shaft in a magnetic recording/reproducing device in which a magnetic tape in a chive cassette drawn out by a tape guide is wound around the outer periphery of a rotating drum housing a rotating magnetic head. between a forward and reverse rotation drive mechanism equipped with a neutral position where it is not connected to either the supply reel stand or the take-up reel stand, and a connected position where it is alternatively connected to either one of these reel stands. An idler that can be used in forward and reverse directions, and a gear punutan that is located within the notch of the tape cassette when the tape cassette is installed and that allows the magnetic tape to run steadily.
A clutch mechanism is provided for selectively setting the synchronous torque output shaft and the slip torque output shaft to a continuous state and a disconnected state, and the idler is rotated in forward and reverse directions (71/reverse rotation of the output shaft). The slip torque output shaft is connected to the rotating body provided on the slip torque output shaft in contact or in a meshed state so as to swing forward and backward in accordance with but,
A magnetic recording and reproducing apparatus characterized in that it is configured to be in the continuous state in the fast forward and rewind modes, and to be in the discontinuous state in the recording and reproducing mode. (2) The magnetic recording and reproducing apparatus according to claim 1, further comprising a cam mechanism for controlling the clutch mechanism, and the cam mechanism is configured to operate in conjunction with a tape guide. (3) A patent in which the clutch mechanism includes a pair of pinions separately provided on the synchronous torque output shaft and the slip output shaft, and a gear that is simultaneously engaged and disengaged from the pair of pinions. A magnetic recording/reproducing device according to claim 1 or 2. (4) The idler is a gear that constantly meshes with a pinion provided on the slip torque output shaft, and the supply side reel stand and the take-up side reel stand each have gears that are selectively meshed with this gear. A magnetic recording and reproducing apparatus according to claim 3.