JPH0343700B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic recording and reproducing device, and in particular, after the lock state of an operation mode is released by the operation of a tape end detector using a planetary gear device, the end of the tape cannot be detected in other operation modes. The object of the present invention is to provide a very simple and compact magnetic recording/reproducing device in which the mechanisms do not interact in any way in terms of operation, thereby preventing any malfunction.

In the conventional tape end detection mechanism using a planetary gear device, the planetary gear device constantly rotates as the reel base rotates, so the end of the tape can be detected only during recording/playback operations, and it is not possible to detect the end of the tape during other fast forwarding or rewinding operations. In the operation mode, the tape end detection is disabled, and when the reel stand stops, the spring that brings the detection lever into elastic contact with the cam of the detection gear, which rotates in reverse, is pulled back in response to the lever operation for fast forwarding and rewinding, and the detection gear and A complicated mechanism was required to separate the detection levers. This conventional configuration requires a complicated lever and link mechanism as described above, and also requires space to house it, which is a major hindrance to miniaturization and weight reduction.

The present invention eliminates the above-mentioned drawbacks of the conventional technology, and is aimed at regenerating and
When the end of the tape is detected in the recording mode, the playback and recording mode is immediately canceled, and the end detection mechanism is separated in conjunction with this release operation, making it possible to detect the end when entering other operation modes. The present invention aims to provide a magnetic recording/reproducing device that does not require any mechanism for the device and is compact and lightweight.

An embodiment of the present invention will be described below based on the drawings.

FIG. 1 is a plan view of the main parts of the magnetic recording/reproducing apparatus of this embodiment showing a stopped state, and FIG. 2 is a side view of the apparatus. In Fig. 1, reference numeral 1 denotes a winding reel stand with a gear 2 integrally provided at the bottom thereof, and is rotatably mounted around a shaft 5 implanted in a lower substrate 4 which is fixed integrally with a substrate 3. It is being
Reference numeral 6 denotes a drive gear driven by a motor (not shown); 9 is pressed from the upper surface by a compression spring 7; and the lower surface is connected to the drive gear 6 via a winding friction member 8.
It is a winding gear to which power is transmitted. The gear 2 of the reel stand meshes with the take-up gear 9 and, on the other hand, with a control gear 10 of a planetary gear set, which will be described later. The driving gear 6 and the winding gear 9 are rotatably mounted on a shaft 11 implanted in the lower substrate 4, and are prevented from coming off by an upper substrate 12 that is integrally fixed to the substrate 3. .

The planetary gear device is rotatably mounted around a shaft 13 embedded in the lower substrate, and the control gear 10 coupled to the gear 2 of the reel base, the sun gear 14 and the detection gear 15 are connected to this shaft 13 as described above. Rotate around the center of rotation. A gear 14a is integrally provided on the outer periphery of the central shaft portion of the sun gear 14, and a gear 14b is also integrally provided on the outer periphery of the sun gear 14. An intermediate gear 16 rotatably provided on a shaft 17 implanted in the lower substrate 4 is coupled to the lower gear 6a of the drive gear 6 and the gear 14b of the sun gear 14, and the sun gear 14 is connected to the intermediate gear 14. 16, it is always rotated in a constant direction at a constant speed during operations such as playback and recording. Furthermore, a rotatable planetary gear 18 is disposed on a shaft 10a integrally provided below the control gear 10, and this planetary gear 18 is connected to a center gear 14a of the sun gear 14.

Furthermore, the planetary gear 18 is the internal gear 1 of the detection gear 15.
It also binds to 5a. The detection gear 15 is inscribed in the inner wall of the gear 14b on the outer periphery of the sun gear 14, is rotatable, and is similarly prevented from coming off by the control gear 10, which is prevented from coming off by the upper substrate 12. Two detection claws 15b are integrally formed on the upper outer circumference of the detection gear 15 at 180° symmetrical positions.

The detection lever 19 for coming into contact with the detection pawl 15b of the detection gear 15 is rotatably provided on the lower side of the substrate 3 about a shaft 20a formed integrally with the release lever 20, and is embedded in the substrate 3. stopper 2
Rotation is restricted by 1. At the tips of both arms of the detection lever 19, there are trace claws 19a for tracing the detection claw 15b of the detection gear 15, and release claws 19b for releasing the playback lock mechanism at the end of the tape by the detection claw 15b. It is arranged. Further, the release lever 20 is connected to a lock pin 22 which is integrally installed in the lock arm 22.
It is rotatable around a and is located between the operating rod 23 and the base plate 3.

The operating rod 23 is slidable while being guided by guide pins 24, 25 implanted in the base plate 3, and is prevented from coming off by fastening parts (not shown) on the guide pins 24, 25. It is also biased to one side by a spring 27, one end of which is hung on this operating rod and the other end is hung on a hook 26 embedded in the board 3.
Furthermore, a pin 28 implanted in the operating rod 23
is inserted into the square hole of the release lever 20, and as the operating rod 23 slides, the release lever 20 is released.
It is configured to rotate. Note that when the operating lever 23 slides to the left, the release lever 2
A guide pin 29 is implanted in the base plate 3 so as to move the rod 0 in the vertical direction, and a pin 28 is implanted in the operating rod 23. Next, in order to lock the operating rod 23, a lock pawl 23a that engages with the locking pin 22a is formed integrally with the operating rod 23. The lock arm 22, on which the lock pin 22a is implanted, rotates around a shaft 30 implanted in the lower substrate 4, and one end is hung on a hook 31 implanted in the lower substrate 4, and the other end is attached to the hook 31 implanted in the lower substrate 4. It is urged to rotate clockwise by a tension spring 32 suspended over the lock arm 22.

Next, the operation of the configuration of the above embodiment will be explained. FIGS. 3 and 4 are plan views during tape constant speed running operations such as recording and reproduction.

First, when the operating rod 23 is manually pushed in to lock the operating rod 23 (described later) and tape constant speed running operations such as recording and playback are started, the drive gear 6 is rotated in the direction of arrow A by the rotation of a motor (not shown). The take-up gear 9 is rotated in the same direction via the take-up friction member 8, the gear 2 is further rotated in the direction of arrow B, and the reel base 1 integrated with the gear 2 is rotated in the direction of arrow B, thereby removing the cassette. Wind the tape in a certain direction. (The reel stand 1 is a take-up reel stand.) On the other hand, the rotation of the drive gear 6 causes the intermediate gear 16 to rotate in the direction of arrow C, causing the sun gear 14 to rotate at a constant speed in the direction of arrow D. In addition, the control gear 1 is rotated by the rotation of the gear 2 integrated with the reel stand 1.
0 in the direction of arrow D. At the same time, the shaft 10a integrally formed with the control gear 10 rotates in the E direction, the planetary gear 18 rotating around this shaft 10a revolves in the E direction, and the center outer circumference of the sun gear 14 rotates. The gear 14a rotates in the downward direction of the arrow, and the planetary gear 18 rotates in the direction of the arrow G.

In the reel stand 1, the tape is fed at a constant speed by a capstan and a pinch roller (not shown), so that the take-up friction member 8 slips due to the difference in rotational speed between the take-up gear 9 and the drive gear 6. The constant winding force generated by this winds up the material onto the hub in the cassette. Here, as described above, the control gear 10 rotates based on the rotation speed of the reel stand 1, but the rotation speed of the sun gear 14 is reduced by the gear 6a of the drive gear 6 and the intermediate gear 16, and the reduction ratio is as described above. The detection gear 15 rotated by the planetary gear 18 is indicated by the arrow H.
Set it to rotate in the direction.

On the other hand, when the operating rod 23 is pushed to the left in the figure against the spring 27, the lock pawl 23a locks into the lock pin 2.
Rotate the lock arm 22 while resisting the tension spring 32 so as to push up the lock claw 23a.
If the lock pin 2 goes too far, the tension spring 32
2a locks the lock pawl 23a, and the operating rod 23 becomes locked by the force of the spring 27 at the locking position of the lock pin 22a and the lock pawl 23a. At the same time, the pin 28 of the operating rod 23 inserted into the square hole of the release lever 20
is rotated to the left in the figure so as to rotate around the lock pin 22a of the lock arm 22. Therefore, the detection lever 19 approaches the detection gear 15, and the tracing claw 19a and release claw 19b, which are integral with the detection lever 19, come into contact with the detection claw 15b of the detection gear 15. Since the detection gear 15 rotates in the direction of arrow H, the detection lever 19 swings along the detection pawl 15b of the detection gear as shown in FIGS. 3 and 4.

Next, when the reel stand 1 stops at the end of the cassette tape, the winding friction member 8 slides as shown in FIG. 5, and the winding gear 9 meshing with the gear 2 of the reel stand 1 stops, and the control Gear 10 stops. On the other hand, the drive gear 6 is continuously rotated by the motor in the direction of the arrow A, so that the sun gear 14 is always rotated in the direction of the arrow F via the intermediate gear 16. Gear 14a on the outer periphery of the center of this sun gear 14
The planetary gear 18 connected to the control gear 10 does not revolve around the control gear 10, but only rotates in the direction of arrow G due to the rotation of the gear 14a of the sun gear 14. Therefore, the detection gear 15 automatically reverses in the direction of arrow I.

The trace pawl 19a of the detection lever 19 is shaped so that it rides on the outer periphery of the detection pawl 15b with respect to the detection gear 15 rotating in the I direction.
The release claw 19b of 9 has a shape that fits into the outer shape of the detection claw 15b. Therefore, detection gear 1
During at least 1/2 rotation in the direction of arrow I in No. 5, the release claw 19b engages with the detection claw 15b, and the sixth
As shown in the figure, the detection lever 19 is pushed upward in the figure by the rotational force of the detection gear 15, and the release lever 20 is guided by the guide pin 29 on the base plate 3 and the pin 28 on the operating rod 23. is pushed up in the direction of arrow J, and the lock arm pin 22a integrated with the lock arm 22 is rotated upward while resisting the tension spring 32. Therefore, the operating rod 23
The lock pawl 23a and the lock arm pin 22a are disengaged, and the operating rod 23 is moved in the direction of arrow K by the bias of the tension spring 27 and returned to the stop mode position.

Furthermore, when the operating rod 23 returns, a pin provided integrally with the operating rod 23 moves the release lever 20 to the right in the figure. Therefore, the release lever 20 rotates around the lock arm pin 22a,
The rotation shaft 20a, that is, the entire detection lever 19 is moved in the same direction. Therefore, the detection lever 19 is separated from the detection gear 15 and the pin 21 implanted in the board
is locked. This state is the stopped state shown in FIG.

In this embodiment, as described above, during playback and recording, the detection gear 15 and the detection lever 19 engage in accordance with the movement of the operating rod 23, so that it is possible to detect the end of the tape. In addition, in the fast forwarding and rewinding operating states, the operating rod 23 does not move, that is, the detection gear 15 and the detection lever 19 do not engage.
The relationship between these two is the same as in the stopped state shown in FIG.

As described above, in this embodiment, when the operating rod 23 is in the returned position, the detection gear 15 and the detection lever 19
Since the structure does not engage, when trying to fast forward or rewind like in the conventional structure,
There is no need for any structure in the detection gear to pull back the spring that presses the detection lever.

Further, in the above example, the detection gear 15 is provided with two detection claws 15b at 180° symmetrical positions, while the detection lever 19 has two arms, one of which is provided with a tracing claw 19a and the other with a release claw 19b at the tips of each arm. and is swingable, so when the detection gear 15 and the detection lever 19 are in the engaged position during playback or recording, the detection lever is attached to one of the detection claws 15b of the rotating detection gear 15. If one of the pawls 19 rides on the detection gear, the other pawl swings and comes into sliding contact with the detection gear. Therefore, there is no need for the spring itself that brings the detection lever into elastic contact with the detection gear as in the conventional case, and in addition to the above, it is possible to significantly reduce the number of members, size, and weight.

In addition, in the above configuration, since the frictional force when the detection lever 19 slides against the detection gear 15 is small, power consumption does not increase significantly during playback and recording operations.

Although not shown in the above configuration, when fast forwarding or rewinding is performed from the playback state, the operating member is driven to unlock the operating lever 23, and the operating lever 23 returns to the same position as when stopped. It is something.

As described above, the present invention includes a control wheel that receives the rotation of the reel stand, a planetary wheel having a support shaft on the control wheel, and an internally toothed detection wheel sandwiching the planetary wheel between the sun wheel. The rotational force from the motor is always transmitted to the sun wheel, and the detection wheel has two detection claws at 180° symmetrical positions, and two claws are attached to each end of both arms for this detection wheel. The detection lever, which can be swung, is made slidable, and the rotation shaft for the detection lever's swing is provided on the release lever, and the operating rod is locked by this release lever.The end of the tape is detected and the operating rod is activated. When the lock is released, the detection lever moves in accordance with the movement of this operating rod and is disengaged from the detection wheel.
The detection lever and the detection wheel are automatically separated during operations such as fast forwarding and rewinding, and a compact, lightweight, and inexpensive magnetic recording and reproducing device can be realized without the need for any complicated mechanism. be.

[Brief explanation of drawings]

FIG. 1 is a plan view of essential parts of an embodiment of the magnetic recording/reproducing apparatus of the present invention in a stopped state, FIG. 2 is a side view thereof, and FIGS. 3 and 4 are plane views showing operating states of recording or reproduction. 5 and 6 are plan views showing the release operation of the operating lever. DESCRIPTION OF SYMBOLS 1... Reel stand, 3... Board, 4... Lower board, 6... Drive wheel, 8... Winding friction member, 9...
... Winding gear, 10 ... Control gear, 12 ... Upper board, 14 ... Sun gear, 15 ... Detection gear, 15
b...detection claw, 16...intermediate gear, 18...planetary gear, 19...detection lever, 19a...trace claw, 19b...release claw, 20...release lever, 2
2...Lock arm, 22a...Lock pin, 2
3...Operation rod, 23a...Lock claw, 27...
...Spring, 32...Tension spring.

Claims (1)

[Claims] 1. A planetary gear device is provided which is rotatably provided on a substrate and has a reel stand for winding the tape, and which receives the rotational drive of the reel stand and another constant speed rotational drive, is provided with a control wheel that receives the rotational drive of the reel stand, a sun wheel that receives the constant speed rotational drive, and further has a planetary wheel that rotates around a rotating shaft that is integrated with the control wheel, and the planetary wheel is The external gear of the sun wheel and the internal gear of the detection wheel are configured to mesh with each other, and while the tape is running, the control wheel, sun wheel, and detection wheel are rotated forward in the same direction, and at the end of the tape, the reel stand is rotated. When the planetary wheel is stopped, the planetary wheel rotates and the detection wheel is reversed in the opposite direction to the control wheel, and the detection wheel is further provided with two point-symmetrical detection claws on the outer periphery thereof, and the detection wheel is rotatable. A detection lever having a center has two arms, and at the tip of each arm, one has a tracing claw and the other has a release claw for contacting the detection claw of the detection wheel, and the tracing claw,
The release pawl is shaped so that when the detection wheel rotates forward, the pawls at both ends escape, and when the detection wheel reverses, one of the release pawls bites into the detection pawl. and a release lever engaged with the locking member, such that the release lever moves with the movement of the operation rod in the first position where the operation rod is locked, and the detection lever and the detection wheel can be engaged. 1. A magnetic recording and reproducing apparatus characterized in that the detection lever is separated from the detection wheel when the operating rod is unlocked and returned to the second position.