JPS6031014B2 - Automatic stop device for tape recorder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention detects when the tape is wound to the end and the reel holder stops during recording, playback, fast forwarding or rewinding operation and automatically starts the tape recorder. This invention relates to an improvement in an automatic stop device that switches to a stopped state.

An automatic stop mode has been developed that automatically switches the tape recorder to a stop state when the tape is wound to its end during recording or playback operation.

However, in this type of conventional device, a means for detecting the end of the tape is provided on the head panel holding the magnetic head, and the detecting means is brought into contact with the tape at the same time as the magnetic head, so that the tape reaches the end. When the tape is wound up, the detection means is activated to return the operation buttons for recording, playback, etc. to the stop position. Therefore, since the magnetic head does not come into contact with the tape during fast forward or rewind operation, the detection means also does not come into contact with the tape, and in this case, the end of the tape cannot be detected, so automatic switching to the stopped state is not performed. . It has also been considered to detect the stoppage of the reel holder using electrical or magnetic means and activate an electromagnet to return the work button, but in this case, a large electromagnet is required and a large current is generated. At the same time, the tape recorder itself had to be large in size.

In view of this, the present inventors have developed an automatic stopping device that uses an extremely simple mechanical means to stop the reel holder and performs automatic cutting using the rotational force of the capstan shaft. This applies a rotation bias force to the rotation detection member due to the rotation of the reel holder,
When the reel receiver stops, the tape recorder is switched from the operating state to the stopped state in relation to the loss of the spreading force of the rotation detecting member. However, this device is designed to automatically switch to the stopped state when the reel holder stops, so if a pause operation is performed during recording or playback, the device will switch to the stopped state at the same time as the reel holder stops. There was a problem that the automatic stop device would not operate when performing pose operations, so it was necessary to make sure that the automatic stop device did not operate.
In addition, in the stopped state, no rotational eccentric force is applied to the rotation detection member, so when the capstan shaft rotates, for example, when recording or playing, the automatic stop device is activated immediately. There was also a risk that it would get lost, so we had to make sure to prevent this as well. The present invention has been made based on the above-mentioned circumstances, and its purpose is to apply biased rotational force to the rotation detecting member by the rotation of the reel receiver, so that when the reel receiver stops, the rotation detecting member of the rotation detecting member is When switching from a recording or playback operation state to a pause state in an automatic stop device that switches the tape recorder to a stop state due to loss of rotational force, or when performing recording, playback, etc. operations in a stop state. The purpose is to prevent automatic switching to a stopped state from occurring. Hereinafter, the configuration of the present invention will be explained with reference to illustrated embodiments.

Figures 1 to 7 schematically show the configuration of an automatic stop device installed in a cassette tape recorder. Figure 1 shows the stopped state, Figure 2 shows the recording or playback operation, and Figure 3 shows the fast-forward operation. FIG. 4 shows the rewinding operation state, and FIGS. 5 to 7 show the process from the operating state to the stop state when the tape is wound to the end in the recording or reproducing operation state. These figures all show the mechanical parts of the tape recorder viewed from the back side, and 1 is the capstan shaft, 2 is the flywheel fixed to the shaft end (lower end) of this capstan shaft 1, and 3 is the capstan. A switching actuation member that rotates about the shaft 1, 4 a rotating body rotatably supported by the switching actuation member 3, 5 a rotation detection member, 6a to 6a.
6d is the stop, play, fast forward, and rewind operation members from the left in the figure, and 7 is the play, fast forward, and rewind operation members 6b to 6d.
This is a locking plate that locks the push-in position. Each operation member 6a~
Pressed steel (not shown) is attached to 6d, and when these push buttons are pressed, each of the operating members 6a to 6d moves toward the locking plate 7. FIG. 8 shows the state in which the capstan shaft 1 is attached to the fixed base plate 8. As shown in FIG.

In the figure, reference numeral 9 denotes a cylindrical bearing case having a flange 9a on the outer periphery.A fixed base plate 8 is inserted into the case 9 from above, and the flange 9a is fixed to the upper face of the base plate 8 with screws 10. In addition, the upper and lower machines of case 9 have ball holders 11a and 1.
1b, and the capstan shaft 1 is rotatably supported by both metals 11a and 11b.
An opening 12 is provided through which the water is introduced. The capstan shaft 1 has a flywheel 2 fixed to its lower end, and an elastic tube (for example, a vinyl tube) 13 that presses the rotating body 4 to the outer periphery of the portion facing the closing portion 12. A pressing projection 2a is provided on the upper surface.
The capstan shaft 1 is attached to the fixed substrate 8 as follows. First, one of the bearing metals 11a is press-fitted into the upper end of the bearing case 9, and the flywheel 2 is press-fitted into the lower end of the capstan shaft 1, and the other bearing metal 11b is loosely inserted into the outer periphery of the capstan shaft from its upper end. iron and fix the elastic tube 13.
Therefore, the bearing case 9 is screwed to the fixed base plate 8, and then the capstan shaft 1 is inserted into the bearing case 9 from below.
The coaxial 1 is inserted into the upper bearing metal 11a, and the lower bearing metal 11b is lightly press-fitted into the lower end of the bearing case 9 to complete the installation. The switching member 3 has a plate shape and has an oval through hole 3a in the center thereof, and the through hole 3a is iron-fitted to the outer periphery of the bearing case 9 so as to be freely rotatable.

Further, the actuating member 3 has a supporting portion 14 around the through hole 3a.
, a pressing operation part 15 and a rotating body support part 16, and the contact part 14 is brought into elastic contact with a fixed piece 18 by a tension spring 17 to be elastically held in a fixed position. The fixed piece 18 is formed by cutting and raising the fixed substrate 8. The rotating body 4 is rotatably supported by the support part 16 of the cutting material 3 via a shaft 4a, and is pressed against the elastic tube 13 through the entrance part 12 of the bearing case 9 by the spring 17. There is.

Note that an elastic material such as rubber is attached to the outer periphery of the rotating body 4 in order to increase the contact friction with the elastic tube 13.
Further, an annular guide groove 19 is formed on the lower surface of the rotating body 4 around the center of rotation. And this guide groove 19
A part thereof is widened, and a locking part 20 is made to protrude in the shape of a sandbar from the center of the wide part. As shown in FIG. 9, the rotation detecting section 5 is rotatably supported coaxially with respect to the reel receiver 21 on the tape winding side.

Note that FIG. 9 shows the state in which the winding-side reel receiver 21 is attached to the fixed substrate 8, and 22 is the bearing metal 1 that is inserted and fixed to the fixed substrate 8. The bearing metal 22 rotatably supports the support shaft 23 of the reel receiver 21, and the support shaft 23
A flange 24 provided in the middle of the bearing metal 22 is mounted on the upper end of the bearing metal 22. Further, a reel driver 25 of the reel receiver 21 is attached to the upper half of the support shaft 23 so as to be movable up and down. A friction plate 26 made of felt or the like is attached to the upper surface of the flange 24, and a pulley (or gear) 27 is rotatably supported on the support shaft 23 on the upper surface side of the friction plate 26. A compression spring 28 inserted between the driver 25 and the friction plate 26 is pressed against the friction plate 26, and the rotational force of a motor (not shown) is applied to the idler pulley (or idler gear) 29 and the above-mentioned boley (or gear) 27.
The signal is transmitted to the reel receiver 21 via. Note that the competing portion between the driving body 25 and the support shaft 23 has, for example, a square cross section so that the two rotate together. On the other hand, a pulley 30 is fixed to the lower end of the support shaft 23, and the rotation of the reel receiver 21 is transmitted to, for example, a counter pulley (not shown) via a belt 31 that is stretched around the pulley 30'. . Further, a friction plate 32 made of felt or the like is attached to the upper surface of the pool IJ 30, and the rotation detection member 5 is rotatably supported on the support shaft 23 on the upper surface side of the friction plate 32, and the detection member 5 is compressed. Spring 33
The reel receiver 21 is always pressed against the friction plate 32, and the rotation of the reel receiver 21 applies a rotation bias force to the detection section 5.
The rotation detection member 5 is made of a plate spring material, and a sake pin 34 as a contact portion is bored on the upper surface of its rotating end.
This pin 34 is connected to the rotating body 4 as shown in FIGS. 1 to 6.
It is inserted into a guide groove 19 provided in the. Further, a pair of left and right elastic pieces 35 and 36 are integrally formed on the detection member 5. A pressing piece 37 is provided at the front position of one elastic piece 35 and at the rear position of the other elastic piece 36.
, 68 are arranged. As shown in FIG. 1, one of the pressing pieces 37 always presses one of the elastic pieces 35 from the front to apply a rotation biasing force to the detection member 5 in the direction of arrow A.
When the playback, fast forward, or rewind operation push button is pressed, the push button moves forward in conjunction with the push button, and the pressure on the elastic piece 35 is released. In addition, the other pressing piece 38
moves forward in conjunction with the push-down operation of the push-down for pause operation, and presses the elastic piece 38 from the rear to apply a diagonal force in the direction of arrow A to the detection member 5. The locking plate 7 has playback, fast forward and rewind operation members 6.
Forehead slopes 3 slanting in the same direction at each front position of b to 6d
9b, 39c and 39d, and hook portions 40b, 40c and 40d on the inside of each mirror slope,
It is always biased in a certain direction by a tension spring 41, and when the push sword for playback, fast forwarding or rewinding is pushed in,
Replaying, fast forwarding or rewinding operation members 6b, 6 of the complicated surface
c or 6d to extend the spring 41, and when these operating members come off the inclined surface, the spring 41 returns slightly, and the hook portions 40b, 40c are attached to the operating member. Alternatively, the button 40d is engaged to hold any operating button in the depressed position (see FIGS. 2 to 4).

Further, the locking piece 7 is formed with a slope 39a for release, and at this time, the slope 39a is such that the locking plate 7 locks the playback, fast forward or rewind operation member 60, 6c or 6d in the pushed position. In this state (FIG. 2, FIG. 3, or FIG. 4), it is located in front of the stop operation member 6a.
Therefore, when the push pin for stopping operation is pushed in in the state shown in FIG. 2, FIG. 3, or FIG.
is pushed by the stop operation member 6a to move laterally in the direction of stretching the spring 41, and the operating button is released from the pressed position to switch the tape recorder from the operating state to the stopped state. Note that the stop operation member 6a automatically returns to its original position by releasing the pressure on the stop pin. Furthermore, an engagement pin 42 is provided protruding from the upper surface of the locking plate 7. As shown in FIGS. 1 to 7, a release member 43 is rotatably supported on the back surface of the fixed substrate 8 via a support pin 44.

This release part village 43 has an engaging protrusion 45 at one end, and the one end is positioned on the upper surface side of the flywheel 2. It is located on the left side (because you are looking at it more closely). Furthermore, an engaging pin 46 is provided at one end of the release member 43, and this pin 46 is connected to the pressing operation section 15 of the switching operation member 3.
It is positioned to the right (left in the figure). The release member 43 is always biased clockwise (counterclockwise in the figure) by a tension spring 47 and is elastically retained by a stopper pin 48 protruding from the fixed base plate 8.
Next, the operation of this automatic stop device will be explained with reference to FIGS. 1 to 7. FIG. 1 shows a stopped state, in which the engagement protrusion 45 of the release member 43 is located outside the rotation orbit of the pressing protrusion 2a protruding from the flywheel 2,
In addition, the rotation detecting section 5 presses one elastic piece 35 against the pressing piece 37.
, and a rotational biasing force is applied in the direction of arrow A.

Therefore, the sliding pin 34 protruding from the detection part 5 is moved by the annular guide groove 1 formed in the rotary body 4 by the rotational deflection force.
It is pressed against the outer inner circumferential surface of 9. FIG. 2 shows the reproducing operation state.

That is, when the push pin for regeneration operation is pressed in the state shown in FIG. 4
Maneuver against 1. On the other hand, the playback operation member 6b is locked at the push-in position by the hook portion 40b of the locking plate 7, and the tape recorder enters the playback operation state. In this state, the capstan ball 1 and the flywheel 2 rotate together in the direction of arrow B, and the rotating body 4 rotates in the direction of arrow C in conjunction with this. Further, the IJ roll receiver 21 on the winding side rotates in the direction of arrow A and winds up the magnetic tape. At this time, the pressing piece 37 moves due to the pushing action of the push nail and separates from the elastic piece 35, but the detection member 5 is given a spreading force in the direction of arrow A by the rotation of the reel shaft 21, so The pin 34 comes into sliding contact with the outer inner peripheral surface of the guide groove 19. Therefore, the slide pin 34 does not collide with the two locking portions in the guide groove 19, and the rotating body 4 rotates in the direction of arrow C. 5 to 7 sequentially show the process from the reproducing operation state to the stop state.

In other words, when a playback operation is performed and the magnetic tape on the rewind side is wound to the end, the reel holder 21 on the winding side is forced to stop because the end of the tape is fixed to the reel hub. (slips between pulley 27 and friction plate 26, and only pulley 27 rotates). Then,
Since the rotation detecting member 5 loses its rotation bias force, the sliding pin 34 separates from the inner peripheral surface of the guide groove 19 in the wide part of the guide groove 19 as shown in FIG. 1
9 collides with the locking portion 20'. As a result, the rotating body 4
Although the rotational movement of the capstan shaft 1 is prevented, the rotational force of the capstan shaft 1 is still transmitted to the rotating body 4, so the rotating body 4 rotates around the coaxial shaft 1 in the direction of arrow D due to the rotational force of the capstan shaft 1. It begins to rotate. Therefore, the rotating body 4
The switching actuation member 3 supporting the switch rotates in the same direction (in the direction of arrow D) against the spring 17, and its pressing operation portion 15 presses the engagement pin 46 of the release member 43, so that the release member 43 is disengaged. The mating protrusion 45 is moved onto the rotational trajectory of the pressing protrusion 2a protrudingly provided on the flywheel 2. Then, the pressing protrusion 2a comes into contact with the engaging protrusion 45, and as shown in FIG. Matching pin 42
The locking plate 7 is moved laterally against the spring 41. As a result, the playback operation member 6b is attached to the hook portion 40b.
The tape recorder comes off and returns to its initial position, and the tape recorder switches to a stopped state (FIG. 1). At this time, the pressing piece 37 moves to the return operation of the push-down for regeneration operation and pushes the elastic piece 35 of the rotation detecting member 5 from the front again, applying a rotation bias force in the direction of arrow A to the detecting member 5 and sliding it. The contact pin 34 is pressed against the outer inner peripheral surface of the guide groove 19. Therefore, when starting the regeneration operation again next time, the sliding bale pin 34 is inserted into the locking portion 2 in the guide groove 19.
There is no problem where the automatic stop device is activated immediately after hitting a river. FIG. 3 shows the fast forward operation state.

That is, in the state shown in FIG.
If it is locked in c, it will enter the fast forward operation state, but in this case as well,
After the pressing piece 37 is separated from the elastic piece 35 of the rotation detecting section 5, a rotation biasing force in the direction of arrow A is applied to the detecting member 5 due to the rotation of the reel shaft 21, so that the slider pin 34 is guided. As long as the tape is pressed against the outer inner circumferential surface of the groove 19 and the tape is wound, the rotational movement of the rotating body 4 is not hindered. However, all the tape is wound up and the reel shaft 2
When the tape recorder stops, the same stop operation as established in Figs. 5 to 7 is automatically performed, and the tape recorder
Switches to the stopped state shown in the figure. FIG. 4 shows the rewinding operation state. In other words, push in the push pin for rewinding,
If the rewinding operation member 6d is fixed to the hook portion 40d of the locking plate 7, the rewinding operation state is established, but in this case as well, the pressing piece 37
After the is separated from the elastic piece 35, the rotation detecting member 5 is given a rotation biasing force in the direction of the arrow F by the reverse rotation of the reel receiver 21 (rotation in the direction of the arrow F), so the sliding pin 34 is As long as the tape is pressed against the inner peripheral surface of the guide groove 19 and the tape is rewound, the rotational movement of the rotating body 4 is not hindered. However, all the tape is wound up and the reel shaft 2
1 stops, the rotation detecting member 5 loses its rotation biasing force, and in this case as well, the same stopping operation as explained in FIGS. 5 to 7 is automatically performed, and the stop shown in FIG. state. Note that since the recording operation is performed by adding another operation to the playback operation, automatic switching from the recording operation state to the stop state is performed in the same way as switching from the playback operation state to the stop state. .

Therefore, the operation in this case is also as shown in FIG. next,
If you want to temporarily stop the running of the tape during recording or playback, you can press pause operation pusher 0 (not shown); Since it moves forward and presses the elastic piece 36 of the rotation detecting member 5 to apply a rotation bias force in the direction of arrow A to the material 5, the sliding support pin 34 of the material 5 moves inside the outside of the guide groove 19. It will be pressed against the surrounding surface.

Therefore, there is no problem in which the automatic stop device is activated even though the reel receiver is stopped during the pause operation. As described above based on the illustrated embodiment, the present invention applies a rotation bias force to the rotation detection member 5 by the rotation of the reel receiver 21, and when the reel receiver 21 stops, the rotation detection member 5 In an automatic stop device for a tape recorder that switches the tape recorder from an operating state to a stopped state in connection with loss of rotational force, the rotation detecting member 5 includes a pair of elastic pieces 35;
36 is provided in a protruding manner, and moves when the tape recorder is switched from the operating state to the stopped state to apply a pressing force to one of the elastic pieces 35, and in conjunction with the switching operation from the recording or playback state to the pause state. The structure is such that a pressing force is applied to the other elastic piece 36 to apply a rotational force to the rotation detecting member 5 in either the stopped state or the paused state, so that the rotation detecting member 5 can be easily rotated from the recording or playback state. When switching to the pause state or performing recording, playback, etc. operations in the stopped state, the automatic stop device will be automatically prevented from operating, and there will be no problem with automatic switching to the stopped state. .

[Brief explanation of drawings]

The figure shows an automatic stop device installed in a cassette tape recorder as an embodiment of the present invention.
The figures are back views showing the schematic configurations of the stopped state, recording or playback operating state, fast forwarding operating state, and rewinding operating state, respectively. Figures 5 to 7 sequentially show the process from the recording or playback operating state to the stop state. The back view, FIG. 8 is a vertical cross-sectional view showing how the capstan shaft is attached, and FIG. 9 is a vertical cross-sectional view showing how the reel receiver is attached. DESCRIPTION OF SYMBOLS 1... Capstan rattan, 2... Flywheel, 3... Switching operation member, 4... Rotating body, 5... Rotation detection member,
6a-6d...operation member, 7...locking plate, 19...
- Annular guide, 20...Locking part, 21...Reel receiver, 34...Sliding contact part, 35, 36...Elastic piece, 37, 38
...Technical pressure piece, 43...Release member. Figure 3 Figure 2 Figure 4 Figure 5 Figure 7 Figure 6 Figure 8 Figure 9

Claims (1)

[Claims] 1 The rotational force of the reel holder is transmitted to the rotatable rotation detecting member by frictional transmission, giving a rotational biasing force to the rotation detecting member, and when the reel holder stops, the rotational biasing force to the rotation detecting member is In an automatic stop device for a tape recorder that switches a tape recorder from an operating state to a stopped state in connection with a loss, a pair of elastic pieces are provided protruding from the rotation detecting member, and the tape recorder is switched from an operating state to a stopped state. A pressing force is applied to one elastic piece in conjunction with the switching operation from the recording or playback state to the pause state, and a pressing force is applied to the other elastic piece in conjunction with the switching operation from the recording or playback state to the pause state. An automatic stop device for a tape recorder, characterized in that a rotation biasing force is applied to the rotation detecting member in any state.