JPS5835754A - Magnetic recorder and reproducer - Google Patents

Abstract

PURPOSE:To attain an automatic reversing with a simple mechanism, by picking up the revolution of an induction motor having a sprescribed slip with a synchronous motor turning a capstan shaft and driving a reel. CONSTITUTION:A coil housing 2 having a coil 4 and a magnetic flux detection element 5 is fixed to a base 11. A rotor 9 consisting of a rotor disc 7 and a rotor magnet 8 is fixed to a capstan shaft 6 one end of which is borne with a bearing 3. A rotor 10 made of a soft iron plate is inserted to an end 6b with step of a middle part of the capstan shaft 6 and is rotated with a prescribed slip with the rotor 9. A slip torque of the rotor 10 is delivered to one of gears 14b, 14c fitted to a shaking arm 14a via a pinion 13. The gears 14b, 14c are respectively geared with the gears (not shown) of supply and rewinding reels for forward or reversing. The tape running is controlled by controlling the direction and magnitude of a current flowing to the coil 4, allowing to form a simple automatic reverse mechanism.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an auto-reverse type magnetic recording/reproducing device, and more specifically, a magnetic recording/reproducing device using an auto-reverse type (automatic reversing type). The present invention relates to an auto-reverse type magnetic recording and reproducing apparatus in which the direction of rotation of the magnetic tape is selected from either forward or reverse to run the magnetic tape in a desired direction.

The capstan shaft in a magnetic recording/reproducing device is provided to run the tape at a constant speed.
It is driven by a drive system that can maintain reliable constant speed rotation.

This invention proposes a novel drive system that has not existed before, and attempts to effectively use the rotational torque that can be extracted from this drive system as rotational driving force for the supply side reel stand and the take-up side reel stand. .

Hereinafter, this invention will be explained based on an illustrated example.

Figure 1 is a longitudinal side view, Figure 2 is 1-1f in Figure 1.
i [+ arrow view, Figure 5 is ■-! in Figure 1! 4, 6, and 7 are cross-sectional plan views showing the main parts of the magnetic recording/reproducing device. FIG.
The cross-sectional view and FIGS. 8 and 9 are plan views of the microcassette mounted state.

In Figs. 1 to 7, (1) indicates a board of a magnetic recording/reproducing device, and a coil housing (2) is attached to this board (1).
are fixed together by screws or other means.

This coil housing (2) is made of an insulator such as a plastic starter, and has a bearing (3) integrally molded in its center, and a coil (4) around this bearing (3).
A required number of magnetic flux detection elements (6) are provided in a predetermined positional relationship. (6) indicates a capstan shaft, and this middle capstan shaft (6) has a middle capstan portion (6) that contacts a magnetic tip on one end side to make it run at a constant speed.
61), and the other end is rotatably fitted into the bearing (6). A first a-tater (9) consisting of a p-ta disk (γ) and a p-ta magnet (8) is fixed to the other end of the capstan shaft (6). Specifically, the center of the rotor disk (7) is the capstan shaft (6) 1F)
A rotor magnet (8) is concentrically fixed to this rotor disc (7). Rotor disc (γ
) is made of an electromagnetic soft iron plate, and gear grooves (not shown) are carved around it, which makes it possible to detect the rotational speed by electromagnetic or optical methods. It becomes possible to obtain a control signal for controlling the rotation speed. Also, as is clear from Figure 5,
The rotor magnets) (8) are alternately magnetized into wings and 8 poles at every 45 degrees of mechanical angle, and the m#i30-ta disc (γ) is magnetized these four days! Also serves as the magnetic circuit of the magnet (8).

The motor described above operates as a so-called two-phase eight-pole synchronous motor, and the magnetic flux detection element (5) detects -
Itta! When the magnetic flux of the magnet (8) is detected and a drive current is supplied to the coil (4) by a first control # circuit (not shown), the tenth #(9) rotates. In this case, an external synchronization signal is compared with a control signal detected from the rotor disk (7) by electromagnetic or optical known methods, and the coil (
By controlling the input in step 4), it is possible to control the rotational speed of the tenth gear (9) to the middle Yapstan shaft (6) to a desired value, so that the synchronous rotational torque is applied to the middle Yapstan shaft (6). can be obtained. In addition, if it is necessary to reverse the rotation direction of the capstan shaft (6), it is sufficient to adopt known means such as reversing the polarity of the magnetic flux detection element (6). This 20th data is applicable to materials with eddy current characteristics, such as electromagnetic soft iron plates, etc. ! The magnetic circuit is made of a material having steresis characteristics such as a magnetic material and has a disk shape, and a magnetic circuit of spatial magnetic flux from a thousand rotor magnets (8) facing the 10th-# (9). Also serves as That is, the 20th-# shaft is fitted onto the capstan shaft (6), and a shaped T&
It is rotatably supported by the step-phase end face (6b) and faces the rotating magnetic field generating means comprising the first O-1 (9) and the coil (4). Therefore, this 24th-
An attractive force of 1M is created between #- and the rotor magnet (8), and this attractive force causes the second w-#
- is pressed against the end face (6-) of the useful part, and a certain frictional force is generated between the contact parts. That is, the first
If a driving current is supplied to the coil (4) in order to rotate the 20th motor (9), at the same time, the 20th motor
The drum is guided by the rotating magnetic field and rotates.

The above-mentioned motor operates as a so-called induction motor, and it works! The spatial magnetic flux of Dunnett (8) is the second
Since the magnetic circuit is constructed by passing through the 0-#-, when the rotor magnet (8) rotates, the eddy current characteristic or the hysteresis torque is applied to the 20th rotor, or the torque added by both of them ( The type of torque differs depending on the material constituting the 20th motor.)
Rotational torque is generated in the rotor in the same direction as the rotational direction of the rotor magnet (8). Moreover, since a frictional force corresponding to the magnitude of the attraction force of the rotor magnet (8) acts between the second vs. The first depending on the magnitude of the frictional force.
The rotational torque of W-1 (9) is transmitted to the 212-th gear via the middle shaft (6). In this way, the 20th
In the -cage, there is a rotational torque in the same direction as the rotational direction of the rotor magnet (8) described above, and an end surface of the stepped part (6b).
A composite torque with the 10th rotational torque (9) transmitted through the frictional force with the 10th-# (9) acts.

This is the slip torque, and this slip torque is constant ^ On the other hand, (6) is the upper substrate, which is the same as the substrate (1).
) by means such as screws, and the upper bearing (b) is integrally fixed to the required location by caulking.

This upper bearing (b) rotatably supports the capstan shaft (6), and contributes to improving the rotational accuracy of this upper bearing (b) and the shaft (6), as well as to improving the bending strength. .

(to) is the above-mentioned slip torque extraction means, and in the illustrated example, this slip torque extraction means is the above-mentioned slip torque extraction means.
0-ta scream and the binion (
13m) is a transmission means, and by this transmission means, the slip torque outputted by the slip torque extraction means (b) is transferred to the supply side reel union or the take-up side reel stand. (b) is transmitted alternatively. The transmission means (4) includes an oscillator-5 (14m) whose longitudinally intermediate portion is swingably supported around the axis of the upper bearing (b), and this oscillating arm (14m). A pair of gears (10) and (14) are respectively pivotally supported at the left and right ends of the
), and this pair of gears (14b), (14
G) is meshed with the binion (13m). On the other hand, the supply side reel stand (B) and the take-up side reel stand (B)
are the spindles (b) and (e) fixed to the board (1), respectively.
It is rotatably supported by a gear (1) at its lower end.
5m), (16m). And these gears (
15a), (16m), swing arm (14m)
A pair of gears (14m) and (1'41) held in correspond to each other, and this pair of gears (14'b)
.

(14・) is connected to the supply side reel stand gear (15&) and the take-up side reel stand gear (16a) while being engaged with the binion (13m) by the swinging of the swing arm (14m) in the forward or reverse direction. It is configured to mesh alternately.

Note that (141) and (14.) indicate gear bins. In addition, as is clear from Fig. 5, the supply side reel stand (9)
and the take-up side reel stand) are provided with locking protrusions (15b), (161)) on the outer periphery of their tips, and these locking protrusions (15)), (16b) are attached to the micro cassette 0. It engages with the reel [(i6! will be described) to transmit rotational force. As is clear from FIGS. 8 and 9, the h-1 magnetic recording/reproducing device is provided with a pinch reel (2) facing the middle shaft (6).

This pinch roller (b) is rotatably supported by a bin (on the roadside of the road) supported by a bin.
The pipin roller (2), whose outer periphery is made of a wear-resistant material such as silicone rubber, is pushed onto the capstan shaft (.) by a restrainable external force. And magnetic tape! When I heard the voice, 1, this magnetic tape! Capstan shaft (a) 6. Push-2 is used to run at a constant speed.In addition, there are erase heads (23 m), (251 I) and recording/reproducing heads (2
4m) and (241+) are provided. These erase heads (25 m), (23b) and recording/reproducing heads (2
4a) and (24b) are operated by a mechanism linked to the arm (2) that supports the pinch roller (2). j475. That is, the erasing head (23&) and the recording/reproducing head (24) provided for the supply side reel stand (to)
In a), when the magnetic tape τ runs in the normal direction M, the pinch roller (to) is pressed against the middle Yapstan shaft (6), that is, only during operation (see Fig. 8).
W is formed so that when the pinch roller (B) is away from the middle tape stand shaft (6), that is, when it is not in operation, contact with the magnetic tape τ is broken. On the other hand, the erasing head (2jSk) and the recording/reproducing head (24
b) - Magnetic tape! When traveling in the rewinding direction 1, only when the pinch roller operates (91st visit)
Touching the tape T - during its non-operation.

is configured so that contact is broken.

The microcassette 0 that can be attached to and removed from the d-recording/reproducing apparatus as described above is shown in FIG. 810 and FIG. 11.

That is, 101111 is a plan view thereof, and FIG. This cassette body) is generally constructed as a sealed case made of plastic, and inside it there is a
IL tape! is stored. - is for the supply side tape hub)
1 and 2 respectively indicate winding side tape heaps, which are rotatably held within the cassette body, and around which the m-era magnetic tape T is wound. A part of the idK tape T is exposed on the negative side of the cassette body, and seven elbows are brought into contact with each of the left and right parts of this exposed part.

・These 7 eltbats), @ is one magnetic tape! This magnetic tape when recording and playing! In the center of the front end of the cassette body, there is a -
A J-hole for the cab 1 stun into which the center shaft (6) of the central shaft (6) of the recording and reproducing device is fitted is formed, and a magnetic hole is formed in the left and right corners of the front end. , I14 are rotatably provided.

Next, I will explain the operation. 0 is installed in the magnetic recording/reproducing device, the capstan shaft (6) is inserted into the capstan hole, and the supply side reel stand is inserted into the capstan hole as shown in FIGS. 6 and 9. The locking protrusions (15b) and (1611) of A and the take-up reel stand are inserted and locked into the supply tape hub and the take-up tape hub. From this state, when the above 2-phase 6-pole synchronous motor is started and the 6 + Yapstan shaft (6) that rotates the middle Yapstan shaft (6) rotates, the 2nd m - The motor rotates and its slip torque is taken out by the pinion (13m). A pair of gears (14b) and (14・) supported by a swing arm (14m) mesh with the binion (1 ink &),
In addition, since these gears (14b) and (14s) are supported by gear bins (1411) and (14@), this swinging arm (14m) is caused by the frictional force between them.
swings in the same direction as the rotational direction of the middle shaft (6). Therefore, for example, when the middle dial shaft (6) rotates clockwise (@8W arrow Q) in plan view, the swing arm (14a) also rotates in the hour hand direction as shown by arrow 1 in FIG. As a result, one gear (14@) supported by this swing arm (14m) meshes with the take-up side reel stand gear (16&). Therefore, Binion (
la) → Gear (14・) → Take-up side reel stand gear (1
A gear train of 6 m) is formed, and the tape hub on the take-up side rotates clockwise (arrow D) as well, as shown by arrow M in Fig. 8, the magnetic tape! is traveling at a constant speed in the normal direction. At this time, use the pinch roller (b) and the eraser pad (23 &
) and the recording/reproducing head (24m) are set in an operating state. Hence magnetic tape! When recording on a magnetic tape, an erasing head (23 m) is used to record on the magnetic tape! After the upper recording signal is erased, the audio signal is recorded by the recording/reproducing head (24m).

Further, when reproducing the recorded signal on the magnetic tape T, the audio signal is reproduced by the recording/reproducing head (24m).

Note that when the running of the tape is stopped (when recording or reproducing is to be corrected), the pinch roller (b), the erasing head (23a), and the recording/reproducing head (24m) are moved to the rear shaft (6). ) and the magnetic tape τ. Conversely, if the capstan shaft (6) rotates counterclockwise (9th v11 arrow wing) in plan view,
The swinging arm (14&) also rotates counterclockwise as shown by arrow 1 in Figure 7 - As a result, the other gear (14k) of the swinging arm (14m) meshes with the supply side reel stand gear (15m). . Therefore, Binion (15m) → Gear (1
4k) → The gear train of the supply side reel stand gear (15m) is changed to shape 1, and the supply side tape hub similarly rotates in the counterclockwise direction (arrow G), and as shown by arrow 1 in FIG. The blade runs at a constant speed in the unwinding direction. At this time, the fillet p-ra (b), the erasing head (2!b), and the recording/reproducing head (24m) are set in the operating state. Therefore, in the same manner as described above, erasing, recording, reproduction, etc. of recorded signals are performed on the magnetic chip.

In a series of cases, if it is not possible to apply sufficient swinging force to the swinging arm (14m) depending on the 5-slip torque taken out from the middle shaft (・) by the pinion (IAa), it is necessary to Year (1)
4b), ``In addition to (14), it is desirable to provide JIiWh with an appropriate means (@! not shown) capable of generating a frictional force.

In this embodiment, the recording/reproducing head (24m), (24m)
b) and the erasing heads (23m) and (23'b) are operated as a pair, but the invention is not limited to this. For example, in the case of a reproduction-only device,
2A&), j2sk+) are no longer required, and two playback heads can be used simultaneously II! Even if it comes into contact with the IIJL chip, there will be no practical problem.

As is clear from the above description, according to the present invention, a constant slip torque can be extracted regardless of the rotational torque of the cab stay shaft, and this slip torque can be applied to the normal running direction of the magnetic tape or the rewinding direction. Since it is used for traveling, the supply or winding torque of the tape is constant regardless of the rotational torque of the intermediate shaft.

In addition, since there is no need to separately provide a mechanical slip mechanism, stable long-life characteristics can be obtained. The switching operation from running the tape in the rough/normal direction to running the tape in the rewinding direction, or in the opposite direction,
Since this can be achieved by simply changing the rotation direction of the capstan shaft, it can be easily applied to auto-reverse type magnetic recording that employs a micro cassette.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a longitudinal cross-sectional side view of the main part, and the second bll is l-l1ll in FIG. 1.
fl arrow view, Fig. 5 is a cross-sectional view of I-1 in Fig. 1, and Fig. 4, rattan 6, and 7 are cross-sectional views of main parts of 1 [1m] - Fig. S is I-1 cross-sectional view in Fig. 84. -Rin cross-sectional view, Figures 8 and 9v! J is! Top view of Italo cassette mounting pattern embroidery - Joy 1
0 is a plan view of the Mitaro cassette, and FIG. 11 is a front view thereof. (6)--Medium Yapustan axis, (*)--10th ta,
(11-...20th gear, merchandising...slip torque extraction means, (13m)...binion, -...transmission means,
(14m)... Swinging arm (14m), (14o)
...Gear, tm-...Supply side reel stand, )...Take-up side reel stand, (15m), (16m)...Gear,
! ...-Ki tape, Q...micro cassette. Agent Makoto Kuzuno (1 other person) Figure 1 Figure 2 Figure 4 Figure 5 Figure 8 Figure 9 Figure 10 Figure 11

Claims (2)

[Claims] (1) Automatic drive 4 in which the direction of rotation of the Yapsutan shaft that contacts and runs the magnetic tape built into the Mitale cassette is selected in either forward or reverse direction to run the magnetic tape in the desired direction. - A human-animal type magnetic recording and reproducing device, comprising: a slip silk extraction means for extracting slip torque between the rotating magnetic field of a synchronous motor that rotates an intermediate shaft; and a slip torque extracted by the slip torque extraction means; 1. A magnetic recording and reproducing apparatus comprising a transmission means for selectively transmitting information to a supply reel stand or a take-up reel stand. (2) The slip torque extraction means is rotatably fitted to the capstan shaft and is constituted by a rotor facing the rotating magnetic field generating means and a binion fixed to the four-torque, and the transmission means is the binion. A pair of ears are meshed with each other and respectively correspond to the supply side reel stand or the take-up side reel stand, and these gears are meshed with one pair of the above-mentioned binions, and while in the engaged state, the gears are rotated around this binion to adjust the swing angle and power. A patent comprising a swinging arm that connects and holds the gears provided on the supply side reel stand and the take-up side reel stand, respectively, and with which the corresponding gears are selectively engaged according to forward and reverse swinging thereof. Magnetic recording and reproducing device 1a according to claim 1