JPS58199461A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To realize a small-sized, lightweight constitution, by separating a mechanism for end detection in interlocking with releasing operation. CONSTITUTION:A detection pawl 15b is formed at the upper external outer- circumference part of a detection gear 15 in one body. A detection lever 19 for abutting on said detection pawl 15 is provided freely rotatably by centering a shaft 20a formed under a base plate 3 together with a release lever 20 in one body and its rotation is restricted by a stopper 21 implanted in the base plate 3. Then, a tracing pawl 19a for tracing the detection pawl 15 and a release pawl 19b for releasing a reproduction locking mechanism by a detection pawl (b) at a tape end are arranged both ends of the detection level 19 respectively. The release lever 20 is made freely rotatable by centering a lock pin 22a implanted in a lock arm 22 in one body and positioned between an operation rod 23 and the base plate.

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, tape end detection is performed in other operation modes. It is an object of the present invention to provide a very simple and small-sized magnetic recording/reproducing device in which the mechanisms do not interact in any way in terms of operation, thereby preventing malfunction of the -cut.

In the conventional tape end detection mechanism using a planetary gear device, the planetary gear device constantly rotates as the reel base rotates, so it is possible to detect the end of the tape only during recording φ playback operation.
In other fast-forwarding and rewinding operation modes, the end of the tape cannot be detected.The fast-forwarding and rewinding levers have a spring that elastically contacts the cam of the detection gear that rotates in reverse when the reel stand stops. A complicated gate mechanism was required to pull back in response to the operation and separate the detection gear and detection lever metal. 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 reproduces it in an end detection device having a planetary gear system.

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, 1 has a gear 2 integrated in the lower part for winding (7), lJ 7'v stand 1, and a shaft 5 implanted in the lower board 4 which is fixed integrally with the board 3. It is rotatably mounted at the center.

Reference numeral 6 denotes a drive gear driven by a motor (not shown), and reference numeral 9 denotes a winding device which is biased by a compression spring 7 from its upper surface and to which the power of the driving gear 6 is transmitted via a winding friction member 8 to its lower surface. It's a gear. The gear 2 of the reel stand is this winding gear 9.
On the other hand, the drive gear 6 and the take-up gear 9 are in mesh with a control gear 1o of a planetary gear device which will be described later. The upper board 12 is fixed integrally with the upper board 5.
The page is stopped.

The planetary gear device is rotatably mounted around a shaft 13 implanted in the lower substrate, and includes a control gear 1o coupled to the gear 2 of the reel base as described above, a sun gear 14, and a detection gear 15.
rotates around this shaft 13 as the rotation center. A gear 14a is integrally provided on the outer periphery of the central shaft portion of the sun gear 14,
A gear 14b is also integrally provided on the outer layer of the sun gear 14. An intermediate gear 16 rotatably provided on a shaft 17 implanted in the lower substrate 4 is coupled to a sixth drive gear, the lower gear 6a, and a gear 14b of the sun gear 14. 16, it is always rotated in a constant direction at a constant speed during operations such as playback and recording. Further, a shaft 1' is provided integrally below the control gear 1o.
A rotatable planetary gear 18 is disposed at Oa, and this planetary gear 18 is coupled to the center gear 14'a of the sun gear 14 through a hole.

The planetary gear 18 is also coupled to the internal gear 15a of the detection gear 15. The detection gear 15 has 6 pages inscribed in the inner gear 14b on the outer periphery of the sun gear 1-4, and is rotatable, and is similarly prevented from being extracted by the control gear 10, which is prevented from being extracted by the upper substrate 12. It's stopped. The detection gear 15 has a 1
Two detection claws 15b are integrally formed at 8g 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 mounted on the substrate 3. Rotation is regulated by a stopper 21 provided. At the tips of both arms of the detection lever 19, there are tracing claws 19 that trace the detection claws 15b of the detection gear 15.
A release mold 19b is provided for releasing the playback lock mechanism at the end of the tape using the detection claw 15b and the detection claw 15b. Further, the release lever 2o is rotatable around a lock pin 22a that is integrally installed in the lock arm 22, and is located between the operating rod 23 and the base plate 3.

The operating rod 23 is a guide pin 2 implanted in the substrate 3.
It is slidable without being guided by guide pins 4 and 25, and is prevented from being removed by fastening parts (not shown) on the guide pins 24 and 25 described on page 7. The release lever 20 is biased to one side by a spring 27 which has one end hung on the operating rod and the other end hung on a hook 26 planted in the base plate 3, and a pin 28 planted on the operating rod 23. The release lever 2o is inserted into a square hole and rotated in accordance with the sliding movement of the operating rod 23. A guide pin 29 is implanted in the base plate 3 so that the release lever 2o is moved vertically when the operating lever 23 slides to the left, and a pin 28 is implanted in the operating rod 23. Next, in order to lock the operating rod 23, a lock claw 23a that engages with the lock pin 22a is inserted into the operating rod 23.
is formed integrally with. The lock arm 22 on which the lock pin 22a is implanted rotates around a shaft 3° implanted in the lower substrate 4, and one end is hung on a 1111 hook 31 implanted in the lower substrate 4. The other end is biased 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, the operating rod 23 is pushed in manually.
Lock (described later) and record.

When a constant speed tape running operation such as playback is started, the driving gear 6 rotates in the direction of the arrow by the rotation of a motor (not shown), and the winding gear 9 is rotated in the same direction via the winding friction member 8. Further, the gear 2 is rotated in the direction of the arrow B, and the reel stand 1 integrated with the gear 2 is rotated in the direction of the arrow B, thereby winding the cassette tape in a fixed 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 the arrow. Further, the rotation of the gear 2 integrated with the reel stand 1 causes the control gear 1o to rotate in the direction of the arrow. At the same time, the shaft 10a is integrally formed with the control gear 1o! The planetary tooth v18 rotates in the direction and rotates around this axis 10a! The gear 14a on the outer periphery of the center of the sun gear 149 rotates in the downward direction of the arrow G, and the planetary gear 18 rotates in the direction of the arrow G.

Note that the reel stand 1 is configured to prevent the winding friction member 8 from slipping due to the difference in rotational speed between the winding gear 9 and the driving gear 6, while the tape is continuously fed by a capstan and a pinch roller (not shown). It is wound onto the knob in the cassette using a constant winding force generated by the winding. 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. Planetary gear 1
The detection gear 15 rotated by 8 is set so as to rotate in the direction of arrow H.

On the other hand, when the operating rod 23 is pushed to the left in the figure against the spring 27, the lock arm 22 is rotated while resisting the tension spring 32 so that the lock claw 23a pushes up the lock pin 22a, and the lock claw 23a moves forward. If too much, the tension spring 32
The lock pin 22a locks the lock pawl 23a, and the operating rod 23., 3 locks the lock pin 2 by the force of the spring 27.
2a, the lock 10, and the locking claw 23a are in a locked state. At the same time, the operating rod 2 is inserted into the square hole of the release lever 20.
3 rotates the release lever 20 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 1 integrated with the detection lever 19
9a and the release mold 19b come into contact with the detection claw 16b of the detection gear 16. Since the detection gear 16 rotates in the direction of arrow H, the detection lever 19 swings along the detection claw 16b of the detection gear as shown in the fourth column of FIG.

Next, when the reel stand 1 stops at the end of the cassette tape, the winding friction member slips and the reel stand 1 stops as shown in FIG.
The take-up gear 9 that meshes with the gear 2 stops, and the control gear 1o also stops. On the other hand, the drive gear 6 is continuously rotated by the motor in the direction of the arrow F, so that the sun gear 14 is always rotated in the direction of arrow F by controlling the intermediate gear 16.

The planetary gear 18 connected to the gear 14a on the outer periphery of the center of the sun gear 14 rotates in the direction of arrow G due to the rotation of the gear 14a of the sun gear 14 without rotating around the control gear 1o. Rotate only as much as possible. Therefore, the detection gear 15 automatically reverses in the direction of the arrow.

The tracing claw 19a of the detection lever 19 is shaped so that it rides on the outer periphery of the detection claw 15b with respect to the detection gear 15 rotating in the working direction, while the release claw 19b of the detection lever 19 is shaped so as to fit into the outer circumference of the detection claw 15b. It is a shape. Therefore, the release claw 19b engages with the detection claw 15b during at least the rotation of the detection gear 15 in the direction of the arrow,
As shown in FIG. 6, the detection lever 19 is pushed upward in the figure by the rotational force of the detection gear 15, and while being guided by the guide pin 29 on the base plate 3 and the pin 28 on the operating rod 23, the release lever 2o 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. However, the lock claw 23a of the control rod 23 and the lock arm pin 2
2a is disengaged, and the operating rod 23 is moved in the direction of the arrow by the bias of the tension spring 27 and returned to the stop mode position.

Furthermore, when the operating rod 23 returns, the operating rod 23
A pin provided integrally with the release lever 2o moves the release lever 2o to the right in the figure. Therefore, this release lever 2o rotates around the lock arm pin 22a, and moves the rotation shaft 20a, that is, the entire detection lever 19 in the same direction. Therefore, the detection lever 19 is separated from the detection gear 15 and is locked to a pin 21 implanted in the substrate. 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 move according to the movement of the operating rod 23.
, the end of the tape can be detected.

In addition, in the operating state of fast forwarding and rewinding, the operation rod 23
does not move, that is, the detection gear 15 and the detection lever 19 do not engage, and the relationship between these two is the same as the stopped state in Figure 1.

As described above, in this embodiment, the detection gear 15 and the detection levers 1913/, - do not engage when the operating rod 23 returns, so fast forwarding and rewinding cannot be performed as in the conventional structure. There is no need for any structure in which the detection gear pulls back the spring that presses the detection lever when the detection gear is about to be moved.

Furthermore, in the above case, the detection gear 15 has two
The detection lever 19 has two arms, one of which is provided with a trace claw 19a and the other with a release claw 19b at the tip of each arm, and is swingable. When the detection gear 16 and the detection lever 19 are in the engaged position in the recording operation state, if one claw of the detection lever 19 rides on one of the detection claws 15b of the rotating detection gear 16, the other claw will swing. Due to the movement, it 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.

Note that in the above configuration, the frictional force when the detection lever 19 slides against the detection gear 15 is small, so that 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 provided at each end of both arms for the detection wheel. The swingable detection lever is made slidable, and the release lever is equipped with a rotation axis for swinging the detection lever, and the release lever locks the operating rod.The end of the tape is detected and the operating rod is locked. When the detection lever is released, the detection lever moves in accordance with the movement of this operating rod, and the detection lever is disengaged from the detection and delivery, so it is automatically activated during operations such as rewinding or rewinding fast forwarding. The detecting member 15 is in a state where the collar and the detecting wheel are separated from each other, and a compact, lightweight, and inexpensive magnetic recording/reproducing device can be realized without requiring any complicated mechanism.

[Brief explanation of the drawing]

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. Figure, 5th
FIG. 6 is a plan view showing the release operation of the operating lever, 1... Reel stand, 3... Board, 4...
・・・Lower board, 6・・・Driver, 8・□・・
... Winding friction member, 9... Winding gear, 10
... Control gear, 12 ... Upper board, 1
4...Sun gear, 15...Detection gear,
15b...detection claw, 16...intermediate gear, 18...planetary gear, 19...detection lever, 19a...trace claw, 19b...
...Release type, 20...Release lever, 22...
... Lock arm, 22a ... Lock pin,
23...Operating rod, 23a...Lock claw, 27...Spring, 32...Tension spring. Name of chief attorney: Patent attorney Toshio Nakao and 1 other person27
7-

Claims (1)

[Scope of Claims] A planetary gear device is provided, which has a reel stand rotatably provided on a substrate and for winding a tape, and receives rotational drive of the reel stand and another constant speed rotational drive, The planetary gear device 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, The planetary wheel is configured to mesh between the external gear of the sun wheel and the internal gear of the detection wheel, and while the tape is running, the control wheel, the sun wheel, and the detection wheel are rotated forward in the same direction. The planetary wheel rotates when the rotation of the reel stand is stopped, and the detection wheel is configured to be reversed in a direction opposite to that of the control wheel, and further includes two point-symmetrical detection claws on the outer periphery of the detection wheel. , and has two arms on the detection lever with a rotation center, and one of the arms has a trace claw and the other has a release claw at the tip of each arm that contacts the detection claw page 2 of the detection wheel. The trace pawl and release pawl are shaped so that when the detection wheel rotates forward, the pawls at both ends escape, and when the detection car reverses, one of the release pawls bites into the detection pawl. The detection lever has a rotating shaft and a release lever engaged with the locking member, and when the operating rod is in a locked first position, the release lever moves with the movement of the operating rod, and the detection lever and the detection wheel are engaged. 1. A magnetic recording and reproducing device characterized in that the detection lever is configured to move away from the detection wheel when the operating rod is unlocked and returned to a second position.