JPH0210503B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a magnetic recording/reproducing device, and particularly to a magnetic recording carrier in which recording/reproducing is performed by winding the magnetic recording carrier around a drum including a rotating magnetic head. This relates to braking of the reel stand.

[Prior Art] Figs. 1 and 2 are illustrative views showing a conventional general magnetic recording/reproducing device, in particular, Fig. 1 shows its plan view, and Fig. 2 shows its front view. 1st
A conventional magnetic recording/reproducing device will be explained with reference to FIGS. A rotating drum 2 comprising rotating magnetic heads 1 shown in FIG. 1 installed at equal intervals on its outer circumferential surface.
are arranged on the substrate 3 at an angle at a predetermined angle. On this substrate 3 are a pair of inlet tape guides 4 and outlet tape guides 5 that form part of the moving mechanism, a fixed magnetic head 6 for recording and reproducing audio signals and rotation control signals, and a magnetic tape. Capstan 7 to run and Capstan 7
A pinch roller 8 is provided to sandwich the magnetic tape between the magnetic tape and the magnetic tape.

The tape cassette 9 includes a set of supply reels 11 on which a magnetic recording carrier, e.g. magnetic tape 10, is wound.
and the take-up reel 12 are held inside, and the rotating drum 2
Notches 13, 14, and 15 are formed on the side edges opposite to each other to receive the inlet tape guide 4, the outlet tape guide 5, and the capstan 7, respectively.
It is removably positioned and mounted on the board 3. The magnetic tape 10 is passed from the supply reel 11 to the guide pin 16.
, and then passes through each of the notches 13, 14, and 15.

As shown in FIG. 2, 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, and both reel stands 17, 18
It is configured to apply a rotational force from an external rotational force generation unit (not shown) to the rotational force transmission units 17a and 18a provided in the main body via an idler or the like. Furthermore, when the supply reel stand 17 and take-up reel stand 18 are stopped, a braking force by a mechanical brake mechanism 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 first
The pair of input-side tape guides 4 and exit-side tape guide 5 shown in the figure hook the magnetic tape 10 in the non-set position in the tape cassette 9 from the positions of the notches 13 and 14 along the path indicated by the dotted line arrow. The fixed magnetic head 6 is moved to a set position where the magnetic tape 10 is in contact with the outer peripheral surface of the rotating drum 2 over an angle of over 180 degrees.
The magnetic tape 10 is pressed against the surface of the magnetic tape 10, and the magnetic tape 10 is further clamped to the capstan 7 by a pinch roller 8. Further, after the magnetic recording/reproduction is completed, both tape guides 4 and 5 return from the set position to the non-set position again.

Fast forwarding and rewinding of the magnetic tape 10 are performed with the entrance tape guide 4 and the exit tape guide 5 housed in the notches 13 and 14, respectively (that is, the magnetic tape 10 is placed in the tape cassette 9).
It is carried out in a state housed in the At this time,
Fast forwarding or rewinding is performed by selectively transmitting the rotational force to the rotational force transmission parts 17a and 18a shown in FIG. 2 provided on the supply reel stand 17 and the take-up reel stand 18 using an idler or the like. It will be done.
The idler is operated mechanically by a push button or the like, or by an electric plunger (not shown) by an electrical signal.

In addition, when stopped, the rotational force transmission section 17
a, 18a, the operation of the brake link (not shown) is linked to the push button to release the braking force when the magnetic tape 10 is running in various modes, or when the electromagnetic plunger is energized. It is configured to release the braking force, and is configured to generate the braking force when stopped and when the power is turned off.

However, the conventional structure described above requires a separate plunger to drive the brake mechanism, which makes the device complicated.

In order to solve this problem, conventionally known devices use a transmission mechanism that is linked to the moving mechanism and transmits power from the moving mechanism to the brake mechanism to activate and release the brake operation of the brake mechanism. (For example, see Japanese Patent Application Laid-Open No. 50-56202.) [Problems to be Solved by the Invention] However, in this conventional example, since the transmission mechanism is composed of a link mechanism, each link is long, Therefore, there is a drawback that the installation space becomes large and the magnetic recording/reproducing device becomes large.

Another disadvantage is that the power of the moving mechanism cannot be immediately transmitted to the link mechanism that constitutes the transmission mechanism. Therefore, it is not possible to rapidly forward or rewind the magnetic tape.

The present invention has been made in view of the above-mentioned conventional drawbacks, and an object of the present invention is to provide a magnetic recording and reproducing device that can be miniaturized and can quickly perform fast-forwarding or rewinding of a magnetic tape. do.

[Means for Solving the Problems] A magnetic recording and reproducing device according to the present invention includes a transmission mechanism that is provided concentrically with the drum and rotates in conjunction with a moving mechanism, and a magnetic recording and reproducing device. a driving gear rotatably supported on a substrate and meshing with the external gear; a driven gear rotatably supported coaxially with the driving gear; and a driven gear meshing with the driven gear and moving linearly by rotation of the driven gear. a rack for activating or releasing the brake operation of the brake mechanism, a stopper for stopping the movement of the rack, and transmitting the rotational force of the drive gear to a driven gear;
and a sliding mechanism that causes a slip between the driving gear and the driven gear when the movement of the rack is stopped by a stopper, and the driving gear, the driven gear, and the rack are connected to the drum. and the two reel stands.

[Operation] According to the present invention, since the transmission mechanism is constituted by an external gear, a driving gear, a driven gear, a rack, etc. that are interlocked with the moving mechanism, the components of the transmission mechanism can be arranged close to each other. Here, while the rotation angle when moving the magnetic tape of the external gear from the non-set position to the set position is large, the necessary movement amount of the rack is small, so by reducing the rotation speed of the drive gear, , it is necessary to reduce the amount of movement of the rack and to downsize the transmission mechanism. However, if the reduction ratio of the driven gear to the drive gear is increased, the diameter of the driven gear becomes larger, which also increases the size of the transmission mechanism. In contrast, the present invention is provided with a stopper that restricts the movement of the rack and a sliding mechanism that causes a slip between the driving gear and the driven gear, so the amount of movement of the rack can be reduced, and the driven gear The gear diameter can be made smaller. Therefore, it becomes possible to arrange the small drive gear, driven gear and rack in a vertically narrow space surrounded by the drum and the two reel stands. This eliminates the need to provide a separate installation space for the transmission mechanism, allowing the magnetic recording and reproducing device to be miniaturized.

Furthermore, by using the gears and racks described above, the power of the moving mechanism can be immediately transmitted to the brake mechanism. In other words, the braking operation of the brake mechanism can be released by only slightly rotating the external gear interlocked with the moving mechanism. Therefore, fast-forwarding and rewinding of the magnetic tape can be performed quickly.

[Examples] Examples of the present invention will be specifically described below with reference to the drawings.

FIGS. 3 to 14 are illustrative views of a magnetic recording/reproducing apparatus according to an embodiment of the present invention, in which the same parts as in FIGS. 1 and 2 are designated by the same reference numerals. Figure 3 shows a plan view of the drive unit with the tape cassette attached to the board, and Figure 4 shows the drive unit with the tape cassette attached to the board.
FIG. 5 shows a front view of the drive section shown in the figure, and FIG. 5 shows a plan view of the drive section in a state where the magnetic tape has been completely drawn out from the tape cassette. 3 to 5, the outer ring 20 has an internal gear 20a cut into the inner periphery of the main portion as shown. On the other hand, the inner ring 21 provided inside the outer ring 20 has an external gear 21 on the outer periphery of its main part.
A is toothed.

A pinion 22 is provided between the outer ring 20 and the inner ring 21. pinion 22
The pinion 22 is configured to mesh with the internal gear 20a of the outer ring 20 and the external gear 21a of the inner ring 21, respectively, and the pinion 22 is rotated in a desired direction by a reversible rotation drive means (not shown).

Guide rollers 23 are provided at two locations in a portion of the gap between the inside of the outer ring 20 and the outside of the inner ring 21 that is not geared. By supporting the rings 20 and 21 at three points using the 232 guide rollers and the pinion 22, both rings 20 and 21 can be held coaxially and rotatably. The guide roller 23 is rotatably supported by a fixing pin 24, and the fixing pin 24 is implanted in the substrate 3.
An entrance arm 25 is rotatably held in the outer ring 20, and an entrance tape guide 4 is provided at the free end of the arm 25. An outlet arm 26 is rotatably supported on a protrusion formed on the outer periphery of the inner ring 21 . An exit tape guide 5 is implanted at the free end of the exit arm 26. The outer ring 20, inner ring 21, pinion 22 and guide roller 2
3, 23, etc. constitute a moving mechanism.

In the configuration shown in FIG. 3, when the pinion 22 rotates in the direction of the arrow A shown in the figure by a reversible rotation drive means (not shown), the outer ring 20 rotates in the direction of the arrow B, and at the same time, the inner ring 21 rotates in the direction of the arrow C. Rotate. In this way, the outer ring 20 and the inner ring 21 are rotated to the state shown in FIG. That is, in FIG. 3, the entrance tape guide 4 and the exit tape guide 5 pull out the magnetic tape from the tape cassette 9 and move the magnetic tape to the state shown in FIG. It's summery. Next, the structure of the brake section of the magnetic recording/reproducing apparatus of this embodiment will be explained with reference to more detailed drawings.

Figure 6 shows a plan view of the drive unit including the brake unit with the tape cassette attached;
The figure is a front view of the one shown in Fig. 6, Fig. 8 is a plan view showing the drive unit including the brake unit when the magnetic tape in the tape cassette is in a fast forward or rewind state, and Fig. 9 is a front view of the magnetic tape in the tape cassette. FIG. 7 is a plan view showing the drive section including the brake section in a normal running state pulled out to a required magnetic tape running path.

The configuration of the magnetic recording/reproducing apparatus of this embodiment will be explained using FIGS. 6 to 9. In FIG. 6, a rotating drum 2 has a built-in rotating magnetic head 1 and a substrate 3.
is placed on top. The side edge of the tape cassette 9 facing the rotating drum 2 has notches 13 and 1.
4 and 15 are formed. These notches 1
Inlet side tape guide 4, outlet side tape guide 5, and capstan 7 correspond to positions 3, 14, and 15.
is arranged on the substrate 3. A pinch roller support plate 27 is rotatably supported around a support shaft 28, and a pinch roller 29 is attached to one end. 30a and 30b each indicate a brake arm, each formed in an L shape, and one end of each is rotatably supported by a shaft 31, so that the arms 30a and 30b are symmetrical to each other about the shaft 31. positioned.

Brake shoes 32a and 32b (FIG. 8) are attached to the other ends of the brake arms 30a and 30b, and are connected to the rotational force transmission section 17a of the supply reel stand 17 and the rotational force transmission section 18 of the take-up reel stand 18, respectively.
A brake spring 33 is adjusted between the protrusions of the brake arms 30a and 30b. Therefore, the spring 3 is connected to the rotational force transmitting parts 17a, 18a of the reel stands 17, 18 via the brake shoes 32a, 32b.
It becomes possible to make the tension of 3 act as a braking force. As shown in FIGS. 3 and 6, when the tape cassette 9 remains mounted on the board 3, static braking force is applied to the supply reel stand 17 and take-up reel stand 18. It is necessary to keep it. When the supply reel 11 and take-up reel 12 rotate in this state, the magnetic tape 10
(Fig. 8) protrudes outside the tape cassette 9,
This is to prevent damage to the magnetic tape 10 when the tape cassette 9 is removed from the substrate 3, and also to prevent damage to the magnetic tape due to slack when the magnetic tape 10 is pulled out onto the running path.

Next, FIG. 8 shows the state of fast forwarding or rewinding of the magnetic tape.

In the figure, in order to rotate the supply reel stand 17 and the take-up reel stand 18 at high speed and run the magnetic tape at high speed, brake shoes 32a and 32b are connected to rotational force transmitting parts 17a and 18 of the reel stands 17 and 18.
It is in a state where it is not in contact with a, that is, it is in a state where no braking force is applied. Therefore, in the brake device for the magnetic recording/reproducing apparatus of the present invention, the outer ring 20 and the inner ring 21 are slightly rotated in the state shown in FIG. 8 (compared to FIG. 6).

Next, FIG. 9 shows a state during normal running, and corresponds to FIG. 5. rings 20, 21
(Fig. 5) Both tape guides 4,
5 moves, pulls out the magnetic tape 10, and places the magnetic tape on the rotating drum 2 until it reaches the set position (i.e., a position that extends over an angle of more than 180 degrees to the outer circumferential surface of the rotating drum 2).
Both tape guides 4 and 5 are positioned by winding them around the tape guides 4 and 5 and pressing them against the inlet and outlet positioning blocks 34 and 35. At the same time, the pinch roller arm 27 is rotated by a drive unit (not shown) and presses the pinch roller 29 against the capstan 7 rotating at a low speed.
The magnetic tape 10 rotates at a constant speed. Take-up reel stand 1
8 is rotated to wind up the magnetic tape 10, and the magnetic tape 10 is constantly running, that is, the magnetic tape 10 is rotated.
Record or play back.

In this case as well, since it is necessary to rotate both reel stands 17 and 18, the brake shoes 32a and 32b are not in contact with the rotational force transmitting parts 17a and 18a of both reel stands, that is, they are not applying braking force ( Brake force is inactive).

Next, in FIGS. 10 to 14, FIG. 10 is a plan view of the brake section with the tape cassette attached to the board, FIG. 11 is a front view thereof, and FIG. 12 is a sectional view showing the slip mechanism section. , FIG. 13 is a plan view of the brake section showing fast forwarding or rewinding of the magnetic tape in the tape cassette;
FIG. 14 shows a normal running state in which the magnetic tape in the tape cassette is pulled out onto a predetermined magnetic tape running path. Figure 10 shows brake shoes 32a and 32b.
This shows a state in which a braking force is applied, and corresponds to FIGS. 3 and 6. In Fig. 10, a drum 2 (Fig. 6) and two reel stands 1 are shown.
In the space between 7 and 18, there is an external gear 20.
b, driving gear 36, driven gear 39, rack 41,
A transmission mechanism including a stopper 43, a sliding mechanism 40, etc. is provided.

The external gear 20b is the outer ring 20 of the moving mechanism.
Concentrically with drum 2 (Fig. 6) on the outer periphery of
Moreover, it is partially formed in the circumferential direction. A drive gear 36 is meshed with this external gear 20b. The drive gear 36 is rotatably supported by a fixed shaft 37 implanted on the substrate 3, and
The driven gear 39 is rotatably supported coaxially with the drive gear 36.

The rack 41 has rack teeth 41a that mesh with the driven gear 39. This rack 40 is moved by the arrows E and H (FIG. 13) by the rotation of the driven gear 39.
It moves linearly in the direction shown by to activate or release the braking operation of the brake mechanism 30. A stopper for stopping the movement of the rack 41 is fixed to the base plate 3.

In addition, the sliding mechanism 40, as shown in FIG.
A clutch disc 38 made of a felt sheet is inserted between the drive gear 36 and the driven gear 39, and a compression spring 40a is inserted between the drive gear 36 and the base plate 3 and presses the drive gear 36 upward. It consists of This sliding mechanism 40 transmits the rotational force of the driving gear 36 to the driven gear 39 via the clutch disc 38, and when the load applied to the driven gear 39 exceeds a predetermined value, that is, the sliding mechanism 40 transmits the rotational force of the driving gear 36 to the driven gear 39 via the clutch disc 38. 41
The clutch disc 38 shown in FIG. 12 is configured to cause slippage between the driving gear 36 and the driven gear 39 when the movement of the clutch disc 38 is stopped by the stopper 43.

On the other hand, a brake actuator 42 is attached to the end of the rack 41 in FIG. 10 so as to be rotatable about a shaft 41b. The brake actuator 42 and the brake arms 30a, 30b have pins 30c, 30d implanted in the brake arms 30a, 30b inserted into oblong holes 42a, 42b drilled in the brake actuator 42. are engaged so as to be slidable in the long diameter direction.

Next, the operation of the magnetic recording/reproducing device will be explained.
When the pinion 22 in FIG. 10 rotates in the direction of arrow A, the outer ring 20 rotates in the direction of arrow B, and as described above, the magnetic tape 10 (FIG. 9) is pulled out and the external gear 20b is rotated. The driving gear 36 and the driven gear 39 that mesh with each other rotate in the direction of arrow D. Rack 4 meshing with driven gear 39
1 slides in the direction of arrow E, and the rack 41 of the transmission mechanism
Since the brake actuator 42 that is engaged with the brake arm 30 also slides in the direction of arrow E,
a, 30b are rotated against the tension of the spring 33, and the brake shoes 32a, 32b are rotated against the reel stands 17, 1.
8, the brake is released. The rack 41 slides further until it hits a stop 43. When the rack 41 hits the stopper 43, the load applied to the driven gear 39 increases, and even if the driving force continues to be applied to the drive gear 36, the clutch disc 38 slips.
Only the driving gear 36 rotates, the driven gear 39 stops rotating, and a force corresponding to the sliding torque of the clutch disc 38 continues to act on the rack 41. This state is shown in FIGS. 13 and 14.

The rack 41 is supported by a guide (not shown) so that it can slide back and forth only in the direction of the stopper pin 43. Further, the rotation of the outer ring 20 by the pinion 22 is stopped by a stopper (not shown) upon completion of winding the tape around the rotating head.

Further, in FIG. 13 (the same is true in FIG. 14), when the outer ring 20 rotates in the direction opposite to the arrow B direction, that is, in the arrow F direction, the driving gear 36 and the driven gear 39 rotate in the arrow G direction. death,
The rack 41 slides in the direction of arrow H, the brake actuator 42 also moves in the direction of arrow H, the brake arms 30a, 30b rotate, and the brake shoes 32a, 32b apply the rotational force of the reel stands 17, 18. Braking force is applied to the reel stands 17 and 18 by contacting the transmission section. That is, the state shown in FIG. 10 is reached.

When the outer ring 20 rotates in the direction of arrow F in this manner, a braking force can be applied to the reel stands 17 and 18 immediately.

Therefore, the magnetic tape is pulled out, that is, the outer ring 20 rotates in the direction of arrow B, and the first
As shown in Fig. 3 (Fig. 8), the reel stands 17 and 18 are in the fast forward and rewind state, and the outer ring 20 further rotates and the reel stands 17, 18 are in the steady running state as shown in Fig. 14 (Fig. 5, Fig. 9). To change the state where no braking force is applied to the stopped state of the reel stands 17 and 18 as shown in FIG. This can be quickly achieved by rotating in the direction. Also, rotation of the outer ring in the direction of arrow F during removal of the tape from the rotary head is made possible by sliding between the drive gear 36 and the driven gear 39 through the clutch disc 38.

In the above configuration, the outer ring 20 in FIG.
The transmission mechanism is composed of the external gear 20b, the drive gear 36, the driven gear 39, the rack 41, etc., which are interlocked with the transmission mechanism.
6, 39, 40, 41, and 43 can be arranged close to each other. Here, while the rotation angle of the external gear 36 when moving the magnetic tape 10 from the non-set position to the set position is large, the necessary movement amount of the rack 41 is small, and therefore the rotation speed of the drive gear 36 is reduced. By reducing the speed, it is necessary to reduce the amount of movement of the rack 41 and to downsize the transmission mechanism. However, when the reduction ratio of the driven gear 39 to the drive gear 36 is increased, the diameter of the driven gear 39 becomes larger.
As expected, the transmission mechanism becomes larger. In contrast, the present invention provides a stopper 43 for regulating the movement of the rack 41, and the drive gear 36 and the driven gear 39.
Since the sliding mechanism 40 is provided to cause a slip between the rack 41 and the sliding mechanism 40, the amount of movement of the rack 41 can be reduced, and the diameter of the driven gear 39 can be reduced. Therefore, the drive gear 36, the driven gear 39, and the rack 41, which are formed small, can be arranged in a vertically narrow space surrounded by the drum 2 (FIG. 6) and the two reel stands 17, 18. It becomes possible. Therefore, there is no need to provide a separate installation space for the transmission mechanism, and the magnetic recording and reproducing apparatus can be downsized.

Furthermore, by using the gears 20b, 36, 39 and the rack 41, the outer ring 2
0 power can be immediately transmitted to the brake mechanism 30. In other words, the braking operation of the brake mechanism 30 can be released by only slightly rotating the external gear 20b interlocked with the outer ring 20 in the direction of arrow F (FIG. 14). Therefore, fast-forwarding and rewinding operations of the magnetic tape can be performed quickly.

Note that the reel stands 17 and 18 are driven by being supplied with rotational force as necessary from a rotational force generation source (not shown).

[Effects of the Invention] As described above, according to the present invention, a transmission mechanism is configured by each gear and a rack, and the transmission mechanism is miniaturized by providing a stopper and a sliding mechanism, and the component parts of this transmission mechanism are Because it is placed in a small space between the drum and two reel stands,
The magnetic recording/reproducing device can be downsized. Furthermore, since gears and racks are used as the components of the transmission mechanism, the power of the moving mechanism can be immediately transmitted to the brake mechanism, thereby speeding up the fast-forwarding and rewinding operations of the magnetic tape.

[Brief explanation of drawings]

Fig. 1 is a schematic plan view showing a conventional example, and Fig. 2 is a schematic plan view showing a conventional example.
3 to 14 are illustrative views of one embodiment of the present invention, FIG. 3 is a plan view of the tape cassette mounted on the board, and FIG.
5 is a plan view of the moving mechanism shown in FIG. 3, FIG. 6 is a plan view including the brake mechanism shown in FIG. 3, FIG. 7 is a front view of FIG. 6, and FIG. 9 is a plan view including the brake mechanism when the magnetic tape is in fast forward or rewind state, FIG. 9 is a plan view including the brake mechanism during normal recording and playback operation, and FIG. 10 is a transmission diagram when a tape cassette is installed. 11 is a front view of FIG. 10, FIG. 12 is a sectional view of the sliding mechanism of FIG. 11, and FIG. 13 is a transmission mechanism of the magnetic tape in fast forward or rewind state. FIG. 14 is a plan view including the transmission mechanism section in a normal running state for recording and reproducing. DESCRIPTION OF SYMBOLS 1... Magnetic head, 2... Drum, 3... Substrate, 9... Tape cassette, 10... Magnetic recording carrier, 17, 18... Reel stand, 20... Outer ring (moving mechanism), 20b... External gear, 30...
Brake mechanism, 36... Drive gear, 39... Driven gear, 40... Slip mechanism, 41... Rack, 4
3...Stoppa.

Claims (1)

[Claims] 1 The magnetic record carrier 10 is moved from a non-set position in the tape cassette 9 to the drum 2 containing the rotating magnetic head 1.
a moving mechanism 20 that moves the reel to a set position where it is in contact with the magnetic recording carrier 10, and a brake mechanism 30 that brakes the two reel stands 17 and 18 on which the magnetic recording carrier 10 is placed.
The movement mechanism 2 is interlocked with the movement mechanism 20.
0 to the brake mechanism 30 to actuate or release the brake operation of the brake mechanism 30, the transmission mechanism is arranged concentrically with the drum 2. an external gear 20b that is provided and rotates in conjunction with the moving mechanism 20; a drive gear 36 that is rotatably supported by the substrate 3 of the magnetic recording/reproducing device and meshes with the external gear 20b; a driven gear 39 coaxially and rotatably supported; a rack 41 that meshes with the driven gear 39 and moves linearly by rotation of the driven gear 39 to activate or release the braking operation of the brake mechanism 30;
A stopper 43 that stops the movement of this rack 41
and a sliding mechanism 40 that transmits the rotational force of the drive gear 36 to the driven gear 39 and causes a slip between the drive gear 36 and the driven gear 39 when the movement of the rack 41 is stopped by the stopper 43. A magnetic recording and reproducing apparatus, characterized in that the drive gear 36, the driven gear 39 and the rack 41 are disposed in a space between the drum 2 and the two reel stands 17 and 18.