JPS6367265B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a recording and reproducing apparatus such as a tape recorder, and in particular, when the recording and reproducing operation is stopped with a cassette attached, the tape-shaped information recording carrier housed in the cassette can be In order to prevent the supply reel and take-up reel from protruding outside the cassette due to unexpected rotation, or from becoming sagging and being damaged when the cassette is taken out or pulled out onto the running path for recording and playback, the supply reel is The present invention also relates to the configuration of a brake mechanism configured to apply static braking force to a reel stand that engages with a take-up reel.

Figures 1 and 2 are illustrative views showing a conventional general magnetic recording/reproducing device, with Figure 1 showing its top view and Figure 2 its front view. A conventional general magnetic recording/reproducing device will be explained.

A rotating drum 2, which includes rotating magnetic heads 1 at equal intervals on its outer peripheral surface, is arranged on a substrate 3 so as to be inclined at a predetermined angle. On this board 3 are a pair of inlet tape guides 4 and outlet tape guides 5, a fixed magnetic head 6 for recording and reproducing audio signals and rotation control signals, a capstan 7 for running the magnetic tape, and this capstan. A pinch roller 8 for sandwiching the magnetic tape between the magnetic tape 7 and the magnetic tape 7 is disposed.

The tape cassette 9 internally holds a set of supply reel 11 and take-up reel 12 around which a magnetic tape 10 as a tape-shaped information recording carrier is wound, and has an inlet side tape guide on the side edge facing the rotating drum 2. 4. Outlet side tape guide 5 and capstan 7
Notches 13, 14, and 15 are formed for receiving the components, and the components are positioned and mounted on the substrate 3 in a removable manner.
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, and 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 attached, the supply reel stand 17 and the take-up reel stand 18 engage with the supply reel 11 and the take-up reel 12 to transmit rotational force, and both the reel stands 17,
It is configured such that rotational force is applied to the rotational force transmitting parts 17a and 18a provided in the rotational force transmission parts 17a and 18a from an external rotational force generating part (not shown) via an idler or the like. Further, when the supply reel stand 17 and the take-up reel stand 18 are stopped, a mechanical static braking force is applied to both reel stands 17 and 18 by the operation of an electromagnetic plunger (not shown) or the like. has been done. The above-mentioned static braking force is applied so that when both reel stands 17 and 18 are driven and rotated by an external rotational force generating section, the rotation of both reel stands 17 and 18 is not stopped by the braking force. , is set to a value that is sufficiently smaller than the driving rotation torque of both reel stands 17 and 18.

Next, in the magnetic recording and reproducing operation, the pair of entrance tape guides 4 and exit tape guides 5 hook the magnetic tape 10 in the non-set position from the positions of the respective notches 13 and 14, and then The magnetic tape 10 is moved along the path of the rotary drum 2 to wrap the magnetic tape 10 around the outer peripheral surface of the rotating drum 2 at an angle exceeding 180 degrees, and the magnetic tape 10 is pressed against the surface of the fixed magnetic head 6. A magnetic tape 10 is sandwiched between capstans 7. 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.

When performing fast forwarding and rewinding of the magnetic tape 10, the entrance side tape guide 4 and the exit side tape guide 5 are connected to each of the above-mentioned notches 1.
3 and 14, that is, the magnetic tape 10 is stored in the tape cassette 9. At this time, fast forwarding and rewinding
This is done by selectively transmitting the rotational force to the rotational force transmission sections 17a and 18a provided on the supply reel stand 17 and the take-up reel stand 18 using an idler or the like. The operation of such an idler is
This is performed by mechanical operation using a push button or the like, or operation of an electromagnetic plunger (not shown) or the like using an electrical signal.

Furthermore, when the recording/reproducing operation is stopped, a static braking force is applied to the rotational force transmitting parts 17a and 18a, and the operation of the brake link (not shown) is performed in conjunction with the push button to move the magnetic tape 10 into various modes. The static brake force is released when the vehicle is running, or the static brake force is released when the electromagnetic plunger is energized, and the static brake force is generated when the vehicle stops or when the power is turned off.

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

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a recording/reproducing apparatus which has a simple structure but can appropriately and reliably perform a braking operation on a reel stand.

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

3 to 14 are illustrative views of a magnetic recording/reproducing apparatus according to an embodiment of the present invention, in which FIG. 3 is a plan view of the drive unit with the tape cassette mounted on the board, and FIG. FIG. 5 is a front view of the drive unit in the figure, and FIG. 5 is a plan view of the drive unit in a state where the magnetic tape has been completely drawn out from the tape cassette.

In FIGS. 3 to 5, the outer ring 20 has an internal gear 20a on the inner periphery of its main part as shown.
is cut into teeth. On the other hand, the outer ring 20
An external gear 21a is cut on the outer periphery of the main part of the inner ring 21 provided inside the inner ring 21.

A pinion 22 is provided between the outer ring 20 and the inner ring 21. This pillion 22 meshes with the internal gear 20a of the outer ring 20 and the external gear 21a of the inner ring 21, respectively.
It is configured to rotate in forward and reverse directions by a reversible rotation drive means (not shown).

Guide rollers 23 are provided at two locations between the inner periphery of the outer ring 20 and the outer periphery of the inner ring 21 that are not geared. By point-supporting, both the inner and outer rings 20, 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 supported on the outer ring 20, and an entrance tape guide 4 is provided at the free end of this arm 25. Also,
An exit side arm 26 is rotatably supported on the protrusion formed on the outer periphery of the inner ring 21,
The outlet side tape guide 5 is attached to the free end of this arm 26.
is provided.

Each of the above components constitutes a tape drawing mechanism, and in such a tape drawing mechanism, when the pinion 22 rotates in the direction of arrow A in FIG. 3 by the reversible rotation drive means, the outer ring 20 rotates in the direction of arrow B, and at the same time the inner ring 21 rotates in the direction of arrow C. By rotating the outer ring 20 and the inner ring 21 in this manner, the state shown in FIG. 5 is achieved. That is,
In FIG. 3, the inlet tape guide 4 and the outlet tape guide 5 pull out the magnetic tape 10 from the tape cassette 9, resulting in the state shown in FIG.
Magnetic tape 1 to the position required for magnetic recording and reproducing operation
0 can be pulled out and moved.

Next, the configuration of the brake section of the magnetic recording/reproducing apparatus of this embodiment will be explained with reference to more detailed drawings.

Fig. 6 is a plan view of the drive section including the brake section with a tape cassette attached, Fig. 7 is a front view of Fig. 6, and Fig. 8 is a view of the magnetic tape in the tape cassette being fast-forwarded or rewound. FIG. 9 is a plan view showing the drive unit including the brake unit in a normal running state in which the magnetic tape in the tape cassette is pulled out onto the running path into a desired magnetic tape.

The configuration of a recording/reproducing apparatus as an embodiment of the present invention will be described with reference to FIGS. 6 to 9.

In FIG. 6, a rotating drum 2 contains a rotating magnetic head 1 and is disposed on a substrate 3. As shown in FIG. 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 4, an exit tape guide 5, and a capstan 7 are arranged on the substrate 3 in correspondence with the positions of these notches 13, 14, and 15. 27 is a pinch roller support plate, and a support shaft 28
It is rotatably supported around the center, and a pinch roller 29 is installed at one end. Reference numerals 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.
a and 30b are located symmetrically to each other.

Brake shoes 32a and 32b are attached to the other ends of the brake arms 30a and 30b, and are configured to contact the rotational force transmission section 17a of the supply reel stand 17 and the rotational force transmission section 18a of the take-up reel stand 18, respectively. At the same time, the brake arm 3
A brake spring 33 is installed between the protrusions 0a and 30b.
is being strung up. By the above, reel stand 1
A brake mechanism 30 is configured that can apply the tension of a spring 33 as a static braking force to the rotational force transmitting parts 17a and 18a of the brake wheels 7 and 18 via brake shoes 32a and 32b. Figure 3,
As shown in FIG. 6, when the tape cassette 9 remains mounted on the board 3, it is necessary to apply static braking force to the supply reel stand 17 and the take-up reel stand 18. . This is because if the supply reel 11 and take-up reel 12 rotate unexpectedly in this state, that is, with the tape cassette 9 still attached to the board 3, the magnetic tape 1
0 protrudes outside of the tape cassette 9, and when the tape cassette 9 is removed from the board 3, the protruding part gets caught on other parts, causing the tape 10 to be easily damaged. When pulling out the magnetic tape, the tape may become slack, which can easily damage the magnetic tape. The above brake mechanism 30
This applies static braking force to the reel stands 17 and 18 in order to prevent such damage to the magnetic tape.

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 10 at high speed, brake shoes 32a, 3
2b is in a state where it is not in contact with the reel stands 17, 18, that is, it is in a state where it is not applying a braking force. Therefore, in the brake mechanism of this recording/reproducing device, the outer ring 2 is in the state shown in FIG.
0, the inner ring 21 has rotated slightly (compared to FIG. 6).

Next, Fig. 9 shows the state during normal driving, and Fig. 5
Corresponds to the diagram.

In the figure, both the tape guides 4 and 5 move in conjunction with the rotation of the inner and outer rings 20 and 21, pull out the magnetic tape 10, and set it to the set position (i.e., a position extending over an angle of more than 180 degrees to the outer peripheral surface of the rotating drum 2). ), the tape guides 4 and 5 are positioned by winding the magnetic tape around the rotating drum 2 and pressing it against the inlet and outlet positioning blocks 34 and 35. At the same time, the pinch roller arm 27 is rotated by a drive section (not shown) and presses the pinch roller 29 against the capstan 7, which rotates at a constant speed, so that the magnetic tape 10 runs at a constant speed. Along with this, the take-up reel stand 18 is rotated to take up the magnetic tape 10, and the magnetic tape 10 is constantly running, that is, recording or reproduction is performed on the magnetic tape 10.

In this case as well, in order to rotate both reel stands 17, 18 with less resistance, brake shoes 32a, 3
2b is in a state in which it is not in contact with both reel stands 17, 18, that is, in a state in which no brake force is applied (brake force non-operating state).

Next, in FIGS. 10 to 14, a plan view of the brake section with the tape cassette shown in FIG. 10 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. 4 shows a normal running state in which the magnetic tape in the tape cassette is pulled out onto a predetermined magnetic tape running path. FIG. 10 shows a state where the braking force is applied by the brake shoes 32a and 32b, and the third
6. Corresponding to FIG. In the figure, the external gear 20b of the outer ring 20 includes a drive gear 3.
6 are engaged. This drive gear 36 is rotatably supported by a fixed shaft 37 implanted on the base plate 3, and a driven gear coaxially supported by the fixed shaft 37 via a clutch 38 formed of a felt sheet or the like. 39 by the force of a compression spring 40a, forming a sliding mechanism 40. Therefore, the rotational force of the drive gear 36 is transmitted to the driven gear 39 via the clutch 38, but if the load applied to the driven gear 39 exceeds a predetermined value, the clutch 38 is configured to slip. .

Reference numeral 41 denotes a rack serving as a reciprocating member, and the driven rack teeth 41a are arranged to mesh with the driven gear 39. 42 is a moving plate, and moving gears 43 and 44 are implanted in this moving plate 42 so that they can rotate while meshing with each other, and driving rack teeth 41b of the rack 41 mesh with the moving gear 43. The driving force generated by the movement of the moving gear 44 is transmitted to the moving gear 44.

Further, a pin 45 is implanted in the movable plate 42, and this pin 45 is connected to the recess 4 of the rack 41.
1c so that the amount of movement is limited. 46 is a plate-shaped toggle spring, both ends of which are held by a pair of spring holding parts 47 on the board 3;
Further, the central portion is clamped by a toggle clamp 42a of the moving plate 42. With this configuration, the movable plate 42 is selectively positioned at two positions by the elastic force of the toggle spring 46. Reference numeral 48 denotes a trigger rack constituting an operating member, and its rack teeth 48b mesh with the movable gear 44, and the trigger rack 48 and the rack 41 are operated by the rack teeth 48b, the movable gears 44, 43, and the drive rack 41b. An interlocking mechanism is configured, and the recess 41c, the pin 45,
The trigger rack 48 is moved by the movable plate 42.
An interlock release mechanism is configured to release the interlock between the rack 41 and the rack 41.

A brake actuator 49 is rotatably engaged with one end of the trigger rack 48, which serves as an operating member, about a shaft 49a. Brake actuator 49 and brake arms 30a, 30b
The pins 30c and 30d installed in the brake arms 30a and 30b are the brake actuator 4.
It engages with oval holes 49b and 49c formed in 9 so as to be slidable in the long diameter direction of the oval.

In the above configuration shown in FIG. 10, when the pinion 22 rotates in the direction of arrow A, the outer ring 20 rotates in the direction of arrow B, and the drive gear 3
6 and driven gear 39 rotate in the direction of arrow D.
Therefore, the rack 41 meshing with the driven gear 39
The moving gear 43 slides in the direction of arrow E (first direction) (the rack is restrained by a sliding guide (not shown) so that it can reversibly slide only in the direction of arrow E) and meshes with the drive rack teeth 41b. rotates in the direction of arrow F, and the moving gear 44 rotates in the direction of arrow G.
Therefore, the movable gear 44 has a lock tooth 48b.
The trigger rack 48 as an operating member that is engaged with the slider slides in the direction of arrow H, that is, in the direction of releasing the static brake force (the trigger rack has a sliding mechanism (not shown) so that it can reversibly slide only in the direction of arrow H. The brake arms 30a, 30b are rotated against the tension of the spring 33 via the brake actuator 49 connected to the guide, and the brake shoes 32a, 32b is released, the static braking force on the reel stands 17, 18 is released. In this operation, the rack 41 continues to move further in the direction of arrow E, and the amount of movement changes between the recess 41c of the rack 41 and the pin 4.
5, the pin 45 comes into contact with the side wall of the recess 41c of the rack 41, so the movable plate 42 starts moving in the direction of the arrow E, delayed by the clearance above the movement of the rack 41.
It slides against the elastic force of the toggle spring 46 to the position shown in FIG. For this reason, the moving gear 44
The engagement with the trigger rack 48 as an operating member is released. In other words, since the interlock between the trigger rack 48 and the rack 41 is released and the trigger rack 48 is moving in the direction of the arrow H, the engaging protrusion 41d of the rack 41 engages with the engaging recess 48a of the trigger rack 48. However, the position of the trigger rack 48 is maintained. In other words, the static brake force is released. FIG. 13 shows a state in which such a series of operations has been completed.

In the state shown in FIG. 13, the brake shoes 32a and 32b do not come into contact with the reel stands 17 and 18, so the magnetic tape can be fast forwarded or rewound without being subjected to rotational resistance due to static braking force. FIG. 14 shows a state in which the outer ring 20 continues to rotate in the direction of arrow B from the state shown in FIG. 13, and normal running (recording, reproducing, etc.) of the magnetic tape is performed. During the period from the state shown in FIG. 13 to the state shown in FIG. Because of the slippage, a force corresponding to the slipping torque at clutch 38 is transmitted to rack 41.

Next, in the state shown in FIGS. 13 and 14, when the outer ring 20 rotates in the direction opposite to the arrow B, that is, in the direction of the arrow I, the drive gear 36 and the driven gear 39 rotate in the direction of the arrow J, and the rack 41 is rotated. The trigger rack 48 slides in the direction of arrow K (second direction), the protrusion 41d is disengaged from the recess 48a of the trigger rack 48, the trigger rack 48 slides in the direction of arrow L, and the tension of the brake spring 33 applies the brake. The arms 30a and 30b rotate and the brake shoe 32
a, 32b come into contact with both reel stands 17, 18, the brake mechanism 30 becomes in a state of applying a stationary brake (brake operating state), and the movable plate 42 is moved in the direction of arrow E by the elastic force of the toggle spring 46. Moving in the opposite direction, the movable gear 44 meshes with the rack teeth 48b of the trigger rack 48, and the rack 4
1 and the trigger rack 48 are restored. That is, the state shown in FIG. 10 is reached. In this case, the rotation angle of the outer ring 20 necessary to apply a static braking force may be small enough to disengage the protrusion 41d of the rack 41 from the recess 48a of the trigger rack 48, and When the rotation is started in the direction of arrow I, the brake mechanism 30 is immediately activated, and a static braking force can be applied to the reel stands 17 and 18. In addition,
By simply rotating the outer ring 20 slightly in the direction of arrow I from the normal recording/reproducing operation shown in FIG. 14 or the fast forwarding or rewinding state of the magnetic tape shown in FIG. However, the braking force is due to the spring tension and does not stop the cantering rotation of the reel stands 17 and 18, so even if the tape is pulled out and the static braking force is applied, the tape will not be securely stored in the cassette. By being wound up, the reel stands 17 and 18, and furthermore the reels 11 and 12, are prevented from unexpected rotation by the static braking force.

As described above, the operation of returning the magnetic tape from the fast forwarding, rewinding, and normal running states to the static braking force application state is performed by the pinion 22.
It is only necessary to rotate the outer ring 20 slightly in the direction of arrow I, and the return to the static braking force applying state can be reliably and quickly performed.

As described above, according to the present invention, the tape-shaped information recording carrier is removed from the cassette due to unexpected rotation of the reel base that engages with the supply reel and the take-up reel that wind the tape-shaped information recording carrier housed in the cassette. In order to prevent the cassette from protruding or sagging and being damaged when taking out the cassette or pulling it out for recording and playback, the brake mechanism that applies a static brake force to the reel stand has a brake mechanism that applies a static brake force to the reel stand and a brake force that is applied to the reel stand. Since the release is performed in conjunction with the withdrawal movement and return movement of the tape-shaped information recording carrier withdrawal mechanism, it is possible to always maintain proper operation while maintaining a simple structure without requiring external means such as push buttons or plungers or complicated link mechanisms. The static braking force can be applied reliably and quickly at the appropriate timing, and the useful life of the tape-shaped information recording carrier can be extended.

[Brief explanation of drawings]

Fig. 1 is a plan view showing an outline of a general conventional example;
2 is a side view of FIG. 1, FIGS. 3 to 14 are illustrative views showing one embodiment of the invention, FIG. 3 is a plan view with a magnetic tape cassette attached, and FIG. 4 is a side view of FIG. is a side view of FIG. 3, FIG. 5 is a plan view after the magnetic tape has been drawn out from the tape cassette, FIG. 6 is a plan view including the same brake mechanism as in FIG. 3, and FIG. Side view of the figure,
Fig. 8 is a plan view including the brake mechanism during fast forwarding and rewinding of the magnetic tape, Fig. 9 is a plan view including the brake mechanism during normal running of the magnetic tape, and Fig. 10 is the drive in the state shown in Fig. 3. A plan view including the rotation mechanism, FIG. 11 is a side view of FIG. 10, and FIG. 12A is a side view of FIG. 10.
Figure 12B is a cross-sectional view of the main part of the sliding mechanism in Figure 10, and Figure 13 is a cross-sectional view taken along line CC in Figure 10.
FIG. 14 is a plan view including the drive rotation mechanism in a state corresponding to FIG. 9, and FIG. 14 is a plan view including the drive rotation mechanism in a state corresponding to FIG. In the figure, 4 is an inlet side tape guide, 5 is an outlet side tape guide, 9 is a tape cassette, 10 is a magnetic tape, 17 and 18 are reel stands, 30 is a brake mechanism, 30a and 30b are brake arms, 4
1 is a rack, 41d is an engaging protrusion, 48 is a trigger rack, and 48a is an engaging recess. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Claims] 1. A supply reel having a rotational force transmitting portion that engages with a supply reel and a take-up reel around which the tape-shaped information recording carrier is wound, respectively, and transmits rotational force when a cassette containing a tape-shaped information recording carrier is loaded. When the recording/reproducing operation starts with the stand and the take-up reel stand and the cassette installed, the tape-shaped information recording carrier in the cassette is moved to the position required for the recording/reproducing operation, and the recording/reproducing operation is started. A tape-shaped information recording carrier drawer mechanism including a pair of tape guides that returns and moves the tape-shaped information recording carrier to a position where it can be stored in a cassette upon completion of the operation, and the supply reel stand and take-up reel stand. A brake mechanism consists of a pair of brake arms that contact and apply a static braking force due to spring tension to both reel stands, and the pair of brake arms of this brake mechanism are applied to the supply reel stand and take-up reel by resisting the spring tension. an operating member that is movable in a direction to release the stationary brake force away from the stand; and a reciprocating member that moves in a first direction and a second direction in conjunction with the pull-out movement and return movement of the tape-shaped information recording carrier pull-out mechanism. a moving member; an interlocking mechanism that moves the operating member in a static brake force release direction in conjunction with the movement of the reciprocating member in a first direction; and the operating member is brought to a static brake force release position via the interlocking mechanism. The operating member and the reciprocating member are configured such that when the operating member moves up to the desired position, the operating member and the reciprocating member engage with each other to hold the operating member in a static braking force released state, and are disengaged by movement of the reciprocating member in the second direction. and an engaging portion formed in each of the engaging portions to release the interlocking between the operating member and the reciprocating member by the interlocking mechanism in the engaged state of these engaging portions, and to prevent the reciprocating member from moving in the second direction. A recording/reproducing device comprising: an interlock release mechanism for returning the associated engaging portion to an interlocking state after the engagement portion is disengaged.