JPS6059652B2 - magnetic recording and reproducing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic recording and reproducing device, and particularly to a magnetic recording and reproducing device using a rotating head such as a video tape recorder, in which a magnetic tape in a tape cassette is wound around a rotating drum containing a rotating magnetic head. The present invention relates to a magnetic recording/reproducing device having a movable tape guide.

1 and 2 are illustrative views showing a conventional general magnetic recording and reproducing device, and in particular, FIG. 1 shows a plan view thereof,
FIG. 2 shows its front view.

A conventional magnetic recording/reproducing device will be explained with reference to FIGS. 1 and 2. A rotating drum 2, which includes rotating magnetic heads 1 at equal intervals on its outer circumferential surface, is arranged on a substrate 3 so as to be inclined at a predetermined angle. On this board 3, there is a pair of inlet side tape guide 4 and outlet side tape guide 5,
A fixed magnetic head 6 for recording and reproducing audio signals and rotation control signals, and a capstan 7 for running a magnetic tape.
and a pinch roller 8 that pinches the magnetic tape between the capstan 7 and the capstan 7. The tape cassette 9 includes a set of supply reel 11 and take-up reel 1 around which a magnetic tape 10 is wound.
2 is held internally, cutouts 13, 14, and 15 for receiving the inlet tape guide 4, the outlet tape guide 5, and the capstan 7 are formed on the side edge facing the rotating drum 2, and It is removably positioned and attached to the

The magnetic tape 10 is arranged to pass from the supply reel 11 through the guide pins 16 and through the respective notches 13, 14, 15. A supply reel stand 17 and a take-up reel stand 18 are rotatably attached to the substrate 3.

When the tape cassette 9 is installed, the supply reel stand 17 and take-up reel stand 18 engage with the supply reel 11 and take-up reel 12 to transmit rotational force to both reel stands 17 and 18. The provided rotational force transmission section 17a, 1
It is configured to apply a rotational force to the rotational force 8a from an external rotational force generation section (not shown) via an idler or the like. Furthermore, when the supply reel stand 17 and the take-up reel stand 18 are stopped,
A braking force by a mechanical brake is applied to both reel stands 17 and 18 by the operation of an electromagnetic plunger (not shown) or the like. In operation, during magnetic recording and reproduction, the pair of inlet tape guides 4 and outlet tape guides 5 hook the magnetic tape 10 in the non-set position from the positions of the notches 13 and 14 in the direction indicated by the dotted arrow. moving along the path, the magnetic tape 10 is placed 180 degrees on the outer peripheral surface of the rotating drum 2.
The magnetic tape 10 is wound over an angle exceeding 100 degrees, the magnetic tape 10 is brought into pressure contact with the surface of the fixed magnetic head 6, and the magnetic tape 10 is further pinched onto the capstan 7 by the pinch roller 8.

Further, after the magnetic recording/reproduction ends, both tape guides 4 and 5 return from the set position to the non-set position again. and,
When fast forwarding and rewinding the magnetic tape 10,
A state in which the inlet tape guide 4 and the outlet tape guide 5 are housed in the cutouts 13 and 14, respectively (i.e., the magnetic tape 10 is housed in the tape cassette 9)
It will be held in

At this time, fast forwarding or rewinding is performed using the speeds provided on the supply reel stand 17 and the take-up reel stand 18. Rolling force transmission section 17
This is done by selectively transmitting rotational force to a and 18a using an idler or the like. The idler can be operated by a mechanical operation such as a push button or an electric plunger (not shown) using an electric signal! be able to do something. When the magnetic tape 10 is stopped, a braking force is applied to the rotational force transmitting parts 17a and 18a, but the operation of a brake link (not shown) is controlled in conjunction with a bush button when the magnetic tape 10 is running in various modes. The method of releasing the power is structured so that the braking force is released when the electromagnetic plunger is energized, and the braking force is generated when the electromagnetic plunger is stopped or when the power is turned off.

However, the above-mentioned idler operation and brake operation have disadvantages in that the link mechanism is complicated and operation delays and failures are likely to occur during electrical sequence control.

This invention was made in order to eliminate the drawbacks of the conventional ones as described above, and an object of the present invention is to provide an improved magnetic recording and reproducing device that has a simple structure and is less prone to operational delays and failures. shall be.

) To summarize the present invention, the supply reel stand and the take-up reel stand are directly connected to a motor included in the drive mechanism, so that driving and braking are performed by the motor, and a mechanical It is equipped with a brake.

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

3 to 13 are illustrative views of a magnetic recording and reproducing apparatus according to an embodiment of the present invention, in particular, FIG. 3 shows a plan view of a tape cassette mounted on a board, and FIG.
5 shows a plan view of the drive section in the state shown in FIG. 3, FIG. 6 shows a sectional view of the drive section in FIG. 5, and FIG. FIG. 8 shows a plan view of the drive unit in FIG. 7, and FIG. 9 shows a plan view of the magnetic tape when it is normally running after the magnetic tape has been pulled out. Show, first
0 shows a plan view of the drive section in FIG. 9, FIG. 11 shows a sectional view of the overall configuration of the reel winding mechanism, and FIG.
A top view of FIG. 1 is shown, and FIG. 13 is a cross-sectional view taken along the direction AA'' of FIG. 11.

First, the schematic structure of the magnetic recording/reproducing apparatus of this embodiment will be explained with reference to FIGS. 3 and 4.

The rotating drum 2 includes a rotating magnetic head 1 therein and is arranged on a substrate 3. For the substrate 3, a soft iron plate material having both strength characteristics and magnetic permeability characteristics is used. Cutouts 13 , 14 , and 15 are formed at the side edge of the tape cassette 9 facing the rotating drum 2 . An entrance tape guide, an exit tape guide 5, and a capstan 7 are movably mounted on the substrate 3 corresponding to the positions of these notches 13, 14, and 15. Both tape guides 4, 5 and capstan 7
is configured to be movable from a non-set position (the position shown in FIG. 3) to a set position (the position shown in FIG. 9, which will be described later) for pulling out the magnetic tape 10 and performing magnetic recording and reproduction. A supply reel 11 and a take-up reel 12 are installed inside the tape cassette 9. A reel winding mechanism 19 is disposed at the tape cassette mounting position on the board 3, and is configured to wind, fast forward, and rewind the magnetic tape 10 during normal running. Next, Figures 5 and 6
See the diagram for the drive part? Explain details.

As shown in the figure, the outer ring 20 has an internal gear cut on the inner periphery of the main part, and cam parts 20a and 20b are formed on the outer periphery thereof. The inner ring 21 provided inside the outer ring 20 has an external gear cut on the outer periphery of its main part.
A pinion 22 is provided between the outer ring 20 and the inner ring 21, and the pinion 22 is connected to the outer ring 20.
meshes with the internal gear of the inner ring 21 and the external gear of the inner ring 21. Guide rollers 23 are provided at two locations in the non-geared portion of the gear between the outer ring 20 and the inner ring 21. By supporting the rings 20 and 21 at three points by the guide roller 23 and the pinion 22, both rings 20 and 21 are held coaxially and rotatable. The fixing pin 24 rotatably holds the guide roller 23, and one end (lower end in the illustration) of the fixing pin 24 is fixed onto the substrate 3. The entrance side arm 25 is rotatably held at one end by the outer ring 20, and the entrance side tape guide 4 is fixed to the other free end. The outlet side arm 26 has one end connected to the inner ring 21 as shown in the figure.
It is rotatably supported by a protrusion formed on the top, and the outlet side tape guide 5 is fixed to the other free end.
The pinch roller arm 27 is rotatably supported around a main shaft 28, and a pinch roller 29 is attached to one end of the arm.
A roller 30 is installed at the other end.

A return spring 3 is attached to one end of the pinch roller arm 27.
1 are linked together, and rotational force is applied by the elastic force of the spring 31. Therefore, the roller 30 is always pressed against the outer circumference of the outer ring 20, and the pinch roller 29 is held at a predetermined position (that is, at a position where an appropriate distance is maintained between it and the capstan 7). Next, the structure of the brake mechanism will be explained.

The brake arm 32 is formed in an L-shape, and a connection portion (center portion) between the long side and the short side is rotatably supported by a shaft 33, and a brake roller 34 is provided at one end of the long side. The brake roller 34 engages with the cam portion 20a of the outer ring 20 (that is, the recess provided on the outer periphery of the outer ring 20). Also, the tip of the short side of the brake arm 32 is connected to the pin 35.
is pivoted to a hole formed in the end of the rod 36. As shown, two brake links 37 are mounted symmetrically, each rotatably supported by a brake pin 38, and a brake shoe 39 is fixed to one end of each of the two reel stands 17. The brake shoes 39 are configured to come into contact with the brake operating portions 19a of the corresponding reel winding mechanisms 19, respectively. Further, a long hole is formed at the other end of the brake link 37, and is engaged with the rod 36. Since the brake link 37 is constantly subjected to tensile force by the brake spring 40 fixed at one end, the brake link 37 is rotated about the brake pin 38 in the direction in which the brake spring 40 acts, and the brake shoe 39 applies the brake. A braking force is applied to the portion 19a.
This brings the reel winding mechanism 19 into a stopped state.
Since this tensile force of the brake spring 40 is also applied to the rod 36, the brake roller 34 acts to press the outer ring 20. As described above, when the tape cassette 9 is mounted on the substrate 3 as shown in FIGS. rotation is regulated.

This is because both reels 11 and 12 in the state shown in FIG.
When the magnetic tape 10 rotates, the magnetic tape 10 protrudes to the outside of the tape cassette 9, which may cause damage to the magnetic tape 10 when the tape cassette 9 is taken out, or malfunctions when the magnetic tape 10 is pulled out onto the running path. This is because you will run into problems. Therefore, the following measures are taken to prevent such accidents and failures. Next, Figure 11~
Details of the reel winding mechanism 19 will be explained with reference to FIG. 13. The flat coil 41 is for generating rotational force, and for example, as shown in the figure, six equal angles (600 mm) are used.
) are fixed on the substrate 3 at intervals. Brake operating part 19a
A rotor disk 43, which also serves as a magnetic flux path, is fixed to the lower side of the rotor. A magnet rotor 42 is fixed concentrically to the back side of the rotor disc 43. The magnet rotor 42 is rotated 45 times. In addition, the flat coil 4 on the substrate 3
For example, three equal angles (1200
) A magnetic flux sensor 44 is attached at each interval. The magnetic flux sensor 44 detects the magnetic flux of the magnet rotor 42 to constitute a three-phase eight-pole synchronous motor. Also, the board 3
A fixed shaft 45 is implanted on top. A metal bearing 47 and a thrust shaft 48 are fitted into the fixed shaft 45 . As a result, the brake operating portion 19a of the reel winding mechanism 19
The metal bearing 47 and the thrust shaft 48 are coaxially integrated, and the brake operating portion 19a is integrated with the rotor disk 43 to receive rotational force. A reel 49 and a spring 50 are provided at the upper part of this brake actuating part 19a.
are fitted to transmit rotational force to both reels 11 and 12. Next, the operation will be explained with reference to FIGS. 3 to 13. The pinion 22 is configured to be rotated in a desired direction by a reversible rotation drive means (not shown), and when rotated in the direction of arrow A shown in the figure, the outer ring 2
0 rotates in the direction of arrow B, and at the same time the inner link 21
rotates in the direction of arrow C. In this way, when the outer ring 20 and the inner ring 21 rotate, the magnetic tape 1
0 fast forward or rewind mode. This fast forward or rewind mode is shown in FIGS. 7 and 8. In this state, both rings 20 and 21 are connected to the cam portion 20 with the brake roller 34 formed on the outer ring 20.
Since it only moves from a (that is, the recess) along the flat part of the outer periphery, the length is very small. It is controlled to stop by a limit switch (not shown) or the like so that it stops when it rotates by a certain amount. At this time, since the rotation angles of both rings 20 and 21 are small, the entrance side tape guide and the exit side tape guide 5 do not pull out the magnetic tape 10. do not have. This is because, at the illustrated angular position, the direction of rotation and the operating direction of the drawer of the magnetic tape 10 do not match, and there is sufficient clearance within the notches 13 and 14 formed in the tape cassette 9. In addition, in the magnetic tape fast forward or rewind mode state, as described above, the brake roller 30
The force moves from the arm portion 20a along the flat portion of the outer circumference, thereby causing the brake arm 32 to rotate and thus the brake link 37 to absorb the tensile force 71 of the brake spring 40. The brake shoe 39 rotates in the opposite direction, and the contact state between the brake shoe 39 and the brake operating portion 19a is released.

Therefore, the reel winding mechanism 19 can rotate freely. In response, the reel winding mechanism 19 selectively rotates the supply reel 11 or the take-up reel 12, thereby rewinding or fast forwarding the magnetic tape 10. On the other hand, when the magnetic tape 10 is stopped, a braking force is applied to the reel winding mechanism 19, and at the same time both rings 20 and 21 are moved to the position shown in FIGS. position), a mechanical brake is applied to prevent the magnetic tape from loosening or protruding from the tape cassette 9 even if the tape cassette 9 is left attached to the board 3 or moved. There are advantages that can be achieved. As mentioned above, since the reel winding mechanism 19 constitutes a three-phase eight-pole synchronous motor, the method of generating braking force in this motor is to use the flat coil 4.
This can be achieved by a known method such as applying a DC voltage to the magnetic flux sensor 44 to generate brake torque, or reversing the polarity of the magnetic flux sensor 44 to generate a reverse torque.

When the rings 20, 21 further rotate, the magnetic tape enters the normal running mode, that is, the recording or reproducing mode.

This state is shown in FIGS. 9 and 10. At this time, both tape guides 4 and 5 interlocked with both rings 20 and 21
moves, the magnetic tape 10 is pulled out and wound to the set position (i.e., a position extending over an angle of more than 180 degrees to the outer circumferential surface of the rotating drum 2), and the magnetic tape 10 is pulled out and wound onto the inlet side and outlet side positioning blocks 51 and 52. By pressing, both tape guides 4 and 5 are positioned. At the same time, the cam portion 20b formed on the outer periphery of the outer ring 20 rotates to move the roller 30 against the return spring 31, and presses the pinch roller 29 against the capstan 7. normal driving is possible. The state of the drive section at this time is shown in FIG.
That is, the cam portion 20b on the outer ring 20 brings the pinch roller 29 and the capstan 7 into contact with each other, so that the magnetic tape 1
0 runs, and the brake shoe 39 and the brake actuating portion 19a come out of contact. Therefore, the reel winding mechanism 19 can freely rotate, and by applying appropriate rotational force to the supply reel 11 and the take-up reel 12,
Winding of the magnetic tape 10 during normal running is performed. Both rings 20 in the recording or playback mode,
21, use a limit switch (not shown)
This is accomplished by stopping the rotation of the pinion 22, etc.

That is, when stopping the running of the magnetic tape from the recording or playback mode, the contact between the pinch roller 29 and the capstan 7 is released by rotating the outer ring 20 in the opposite direction to such an extent that the cam portion 20b and the roller 30 are disengaged. At the same time, by applying an electromagnetic brake to the reel winding mechanism 19, the rotation of both reels 11 and 12 is stopped.
At this time, mechanical brakes have never been used, but even if the magnetic tape 10 becomes loose while stopped, rotational force is applied to the reel and the magnetic tape is wound up when moving to the next operation. By doing so, you will not suffer any actual harm.
As described above, the magnetic recording and reproducing device of the present invention does not require a pinch roller or an electromagnetic plunger for a brake, and can be made smaller and lighter, reducing power consumption.
Effects such as being able to eliminate operational delays and less likely to cause malfunctions can be achieved.

The present invention is particularly effectively used in portable magnetic recording and reproducing devices.

[Brief explanation of the drawing]

1 and 2 are illustrative views of a conventional general magnetic recording and reproducing apparatus. 3 to 13 are illustrative views of a magnetic recording/reproducing apparatus according to an embodiment of the present invention, in particular, FIG. 3 is a plan view of a tape cassette mounted on a board, and FIG. Front view,
5 is a plan view of the drive section in FIG. 3, FIG. 6 is a sectional view of the drive section, FIG. 7 is a plan view of the magnetic tape in the fast forward and rewind states, and FIG. 8 is a plan view of the drive section in FIG. 7. FIG. 9 is a plan view of the magnetic tape during normal running, and FIG.
The figure is a plan view of the drive section in FIG. 9, FIG. 11 is a sectional view showing the overall configuration of the reel winding mechanism, FIG. 12 is a top view in FIG. 11, and FIG. 13 is an A-N in FIG. 11. FIG. In the figure, 1 is a rotating magnetic head, 2 is a rotating drum, 3 is a substrate, 4 is an entrance tape guide, 5 is an exit tape guide, 9 is a tape cassette,
10 is a magnetic tape, 11 is a supply reel, 12 is a take-up reel, 19 is a reel winding mechanism, 20 is an outer ring, 21 is an inner ring, 37 is a brake link, and 39 is a brake shoe.

Claims (1)

[Claims] 1. In a magnetic recording and reproducing device, the magnetic tape in a tape cassette is pulled out and wound around a rotating drum disposed at a predetermined position on a substrate and containing a rotating magnetic head therein by means of a movable tape guide. A drive mechanism configured to drive a reel stand for transmitting rotational force to each of a supply reel and a take-up reel included in the tape cassette by independent motors, and a drive mechanism driven by the movable tape guide. Further, a mechanical brake is provided to mechanically brake the rotation of the reel stand, and when the tape cassette is mounted on the board, the mechanical brake applies braking to the reel stand to fast-forward or fast-forward the magnetic tape. In the rewinding state, the movable tape guide rotates to such an extent that the magnetic tape is not pulled out, the mechanical brake is released, and the reel stand can be rotated by the motor, and in the stopped state of the magnetic tape, the 1. A magnetic recording and reproducing apparatus, characterized in that a motor is electromagnetically braked, and the reel stand is braked by the mechanical brake by the operation of the tape guide.