JPS6214901B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tape recorder, and an object of the present invention is to prevent unstable meshing of gears during operation switching in a tape recorder that performs high-speed tape feeding such as fast forwarding and rewinding by gear drive. The purpose is to prevent gear noise from occurring under certain conditions.

In conventional tape recorders of this type, the gear train involved in rewinding or fast forwarding changes from a non-meshing state to a meshing state during a so-called review operation, in which a rewind operation is performed from a playback state, or during a cue operation, a fast-forward operation from a playback state. is displaced, but
During this displacement process, an unstable meshing state occurs between the rotating driving gear and the driven gear, so the gear noise at that time is naturally far greater than the gear noise when the switching operation is completed and the normal meshing state is achieved. This caused discomfort to the user.

Therefore, the present invention is designed to prevent the generation of large gear noise during the above-mentioned operation changeover, so that the operation changeover can be carried out smoothly, and is described in Japanese Patent Application No. 1983-4203 filed by the same applicant. This invention is a further improvement of the invention.

An embodiment of the present invention will be described in detail below with reference to the drawings.

In FIGS. 1 and 2, a motor 1 is held by a motor support plate 3 fixed to an upper substrate 2, and a motor pulley 4 is fixed to the end of its rotating shaft. A flywheel 6 is fixed to one end of the capstan 5, and the capstan 5 includes a capstan bearing 7 disposed on the upper substrate 2 and a thrust bearing disposed on the lower substrate 8 disposed below the upper substrate 2. It is rotatably pivotally connected by 9. The main gear 10 is rotatably connected by a main gear shaft 11 disposed approximately at the center of the upper substrate 2 and the lower substrate 8. Also, on the upper board 2, the motor 1
and the flywheel 6.
A counter pulley 13 is rotatably pivotally connected to 2. Then, the motor pulley 4, counter pulley 13, flywheel 6 and main gear 10
are connected by a single endless belt 14, and are configured to transmit the rotation of the motor 1. As is clear from the figure, only the counter pulley 13 is configured so that its rotation direction is opposite to that of the motor 1. Further, the main gear 10 described above has a gear 10a formed in its center and an internal gear 10b formed inside its outer periphery.

The gear lever shaft 15 is arranged concentrically with the main gear shaft 11 and on the opposite side of the upper substrate 2, and a take-up gear lever 16 and a fast-forward gear lever 17 are rotatably supported. A take-up gear 18 is rotatably attached to the take-up gear lever 16 so as to constantly mesh with the gear 10a of the main gear 10, and a rewind gear 19 is attached to the fast-forward gear lever 17.
The rapid-forwarding gears 20 are rotatably connected in a mutually meshed state.

The take-up reel stand 21 and the supply reel stand 22 are rotatably pivoted to the lower substrate 8 and configured to be inserted into the opening 2a of the upper substrate 2 and engageable with a reel hub of a tape cassette (not shown). . Further, the take-up reel stand 21 has a first take-up reel gear 23 that rotates integrally therewith, and a second take-up reel gear 24 that is coupled to the take-up reel stand 21 via a known friction mechanism. The supply reel stand 22 has a supply reel gear 25 that rotates integrally therewith.

Further, in the above-mentioned fast-forward gear lever 17, the guide shaft 26 planted at one end thereof is inserted into the guide hole 2b transparently provided in the upper substrate 2, and the gear lever shaft 15 is inserted into the oval-shaped hole 17a at the approximate center of the lever. At the same time, an interlocking shaft 27 established at the other end is inserted into an oval-shaped hole 16 a transparently provided in the winding gear lever 16 .

The winding gear lever 16 has the aforementioned oval hole 16.
In addition to a, another oval hole 16b is provided transparently,
This includes an axis 29 established on the rapid traverse control rod 28.
are inserted and engaged. The fast-forward control rod 28 is pivotally mounted to be slidable in the direction of the arrow A-A' on the upper substrate 2, and a control shaft 31 with a roller 30 rotatably mounted thereon is installed approximately in the center thereof. Board 2
is inserted into the through hole 2c. The regeneration rod 32 is pivotally mounted on the upper board 2 so as to be freely inserted in the direction of arrow B-B', and is biased in the direction of arrow B' by a regeneration rod spring 33 suspended between one end 32a and the upper board 2. has been done. Further, this regeneration rod 32 is provided with button shafts 35, 36 for fixing the regeneration button 34, lock pawls 32b, and a rod operating pin 37, which passes through the board loosely, and furthermore, a main switch rod 38. It loosely passes through the through hole 38a. Furthermore, a head board 43 having an approximately inverted T shape on which a pinch roller arm 40 to which the pinch roller 39 is rotatably mounted, a magnetic head 41, a tape guide 42, etc. is placed is mounted on the upper board 2 in the direction of arrow B-B'. It is slidably pivoted and has a through hole 43 approximately in the center.
Button shafts 35 and 36 provided on the playback rod 32 are inserted into a and 43b, and a motion spring 44 whose ends are respectively locked to the button shaft 35 and the magnetic head 41 is inserted.
As a result, the head substrate 43 is brought into elastic contact with the reproduction rod 32. Also, the tip end 43c of the head board 43
An inclined surface is formed corresponding to the roller 30. Further, a switch arm 45 is disposed near the other end 43d of the head board 43 and is rotatably supported on the upper board 2 so that one end 45a thereof corresponds to the end 43d. The switch arm 45 is always urged to rotate counterclockwise by a spring 46.

A fast-forwarding rod 47 and a rewinding rod 48 (see FIG. 2) are pivotally attached to the back surface of the upper substrate 2 so as to be able to slide freely in the direction B-B', and near their respective tips,
Pressure contact portions 47a, 4 for fast-forward control lever 49
8a and actuating pins 51, 52 for actuating the sub-switch rod 50 are provided. The fast-forward control lever 49 has a substantially triangular shape and is disposed between the fast-forward rod 47 and the rewind rod 48 on the back surface of the upper substrate 2, and has a hole 49 made transparent in the center.
The control shaft 29 is inserted into the control lever spring 53 whose one end is locked to the upper substrate 2.
The stepped portion 4 is biased in the direction of arrow B' by
9b and 49c are in pressure contact with the pressure contact portions 47a and 48a of the fast forwarding rod 47 and the rewinding rod 48, respectively. Also, fast forward rod 47, rewind rod 48
The other end has a through hole 3 for the main switch rod 38.
Lock pins 54 and 55 are provided loosely through 8b and 38c. Main switch 3 mentioned above
8 is pivotally mounted on the back surface of the upper board so as to be slidable in the direction of the arrow A-A', and as mentioned above, the rod actuating pin 3
7. It has through holes 38a, 38b and 38c with inclined parts corresponding to the lock pins 54 and 55, and is always biased in the direction of arrow A by a spring 56 at one end 38d.

Further, the sub-switch rod 50 is pivotally mounted on the back surface of the upper substrate 2 so as to be slidable in the direction of the arrow A-A', and has inclined portions 50a and 50a corresponding to the actuating pins 51 and 52, respectively.
50b and has a rising portion 50c at one end, and is always urged in the direction of arrow A' by a spring 57. The playback switch 58, fast-forward switch 59, and power switch 60 correspond to the end 45b of the switch arm 45, the end 50c of the sub-switch rod 50, and the end 38e of the main switch rod 38 on the back surface of the upper board 2. It is arranged as follows. The stop rod 61 is pivotally attached to the back surface of the upper board 2 so as to be slidable in the direction of arrow B--B', and is provided with a lock release pin 62, and the stop rod is biased in the direction of arrow B' by a spring 63. There is.

Lock rods (not shown) are pivotally mounted on the upper substrate 2 so as to be able to slide freely in the direction of arrow A--A', and are connected to the reproducing rod 32, the fast-forwarding rod 47, and the rewinding rod 4.
8 and a through hole for engagement with the stop rod 61, and is constructed so that each operating section can be locked in a known manner.

Next, the electrical configuration will be described. In FIG. 8, a power supply (not shown) is connected to the power supply terminal 63.
One terminal of a power switch 60 is connected to the power terminal 63, and the other end of the switch is connected to the base of a transistor 65 via a resistor 64. The emitter of the transistor is grounded, and the collector is connected to the base of the transistor 66 via a resistor 67. The emitter of the transistor 66 is connected to a power switch, and the collector is connected to the tape drive motor 1. On the other hand, the base of the transistor 65 is grounded through a reproduction switch 58 and a fast forward switch 59 connected in series.

Next, the operation of the above embodiment will be explained.

FIGS. 1 and 2 show the tape recorder of this embodiment in a stopped state. In this state, the playback switch 58, fast-forward switch 59, and power switch 60 are all in an open state, a so-called OFF state. The tape running motor 1 is stopped. If the playback button 34 is pressed from this stopped state and the playback rod 32 is operated in the direction of arrow B, the playback rod 32 is held locked at the position shown in FIG.
At this time, the head board 43 which is in elastic contact with the playback rod 32 by the force of the spring 44 also moves in the direction of arrow B together with the playback rod 32, and the pinch roller 39 is pressed against the capstan 5, and the head board 43 is pressed against the capstan 5. The end portion 43d rotates the switch arm 45 and the regeneration switch 58 is closed. Further, as the regeneration rod 32 is operated in the direction of arrow B, the main switch rod 38 is activated by the rod operating pin 37 provided on the regeneration rod 32.
It moves in the direction A' and is held locked at the position shown in FIG. At this time, the movement of the end 38e of the main switch rod 38 brings the power switch 60 into a closed state. Further, the take-up reel stand 21 is connected to the motor 1.
Rotation is transmitted through a transmission path: → belt 14 → main gears 10, 10a → take-up gear 18 → second take-up reel gear 24 → (friction mechanism) → take-up reel gear 21.

Next, with reference to FIGS. 5 to 7, an explanation will be given of the operation when performing a fast-forward operation, so-called queue (high-speed playback) operation, from the playback state. In this case, first, as shown in FIG. 5, the pressure contact portion 47a of the fast-forward rod 47 presses one bottom stepped portion 49b of the fast-forward control lever 49, so that the fast-forward control lever 47 resists the biasing force of the control lever spring 53. Then, it rotates counterclockwise about the other bottom stepped portion 49c as a fulcrum. During this rotation, the through hole 4 of the fast-forward control lever 49
9a is engaged with the control shaft 31, the rapid feed rod 28 moves in the direction of arrow A', and therefore the winding gear lever 16 is engaged with the shaft 29 and the winding gear lever 16 is engaged with the winding gear lever 16. The fast-forwarding lever 17 located at
8 and the second take-up reel gear 24 are disengaged. Also, at this time, due to the rotation of the fast forward gear lever 17, the rewind gear 19 is shifted to the internal gear 10.
It is close to b but not in contact with it yet. Further, as the fast-forwarding control rod 28 moves in the direction of arrow A', the head board 43 in contact with the roller 30 moves in the direction of arrow B' due to the component force in the direction of arrow B' which is received by the slope of the tip recess 43c, that is, the head board 43 is regenerated. By moving back slightly from the position, the pinch roller 39 is released from being pressed against the capstan 5. At the same time, the switch arm 45 also rotates counterclockwise due to the biasing force of the spring 46, but the regeneration switch 58 still remains closed. Further, the actuating pin 51 provided on the fast-forwarding rod 47 presses the inclined portion 50a of the sub-switch rod 50, and the sub-switch rod 50
moves in the direction of arrow B. This movement of the sub-switch rod 50 brings the fast-forward switch 59 into a closed state.

From this state shown in Fig. 5, fast forward the rod 47.
When pressed in the direction of arrow B, the rapid feed gear lever 17 rotates greatly as shown in FIG.
8 and the second take-up reel gear 24 are cut off, and the rewind gear 19 becomes the internal gear 10b.
At the same time, the fast-forwarding gear 20 becomes in mesh with the first take-up reel gear 23. However, in this state, the playback switch 58 and the fast-forward switch 59 are still closed.

From this state shown in Fig. 6, fast forward the rod 47.
When pressed in the direction of arrow B, the subswitch rod 50 moves further in the direction of arrow A, as shown in FIG. 7, and the fast forward switch 59 remains closed. On the other hand, since the head board 43 further moves in the direction of arrow B', the rotation angle of the switch arm 45 in the counterclockwise direction increases, and the regeneration switch 58 becomes open, and the internal gear 10, which is already in the engaged state,
d. The take-up reel table is rotated at high speed by the gear train of the rewind gear 19, the fast-forward gear 20, and the first take-up reel gear 23 to obtain a predetermined queue state.

If the pressing operation of the fast-forward rod is stopped in the queue state, the process returns to the playback state shown in FIG. 4 through the reverse process. When performing a rewind operation (so-called review operation) from the playback state, the moving direction of the fast-forward control rod 28 and the rotating directions of the take-up gear lever 16 and the fast-forward gear lever 17 change, and the reel stand rotated at high speed becomes the supply reel stand. Therefore, further explanation will be omitted.

In the movement of the mechanism described above, only the relationship between the switch and the motor will be explained using FIG. When the tape recorder is in the playback state, the playback switch 58 and the power switch 60 are closed. A voltage is applied from the power terminal 63 to the base of the transistor 65 via the power switch 60 and the resistor 64,
Transistor 65 becomes active. As a result, the collector voltage of transistor 65 decreases, transistor 66 becomes active, and current flows through motor 1. If a fast-forward operation is performed here, the fast-forward switch 59 is closed at the beginning of the operation, and the regeneration switch 58 is also closed, so the transistor 65 is closed.
The base voltage becomes 0, the transistor 65 is cut off, the transistor 66 is also cut off, and the current to the motor 1 is stopped. As the fast-forwarding operation is continued, the gears change from the non-meshing state to the meshing state as described above, and at the end of the fast-forwarding operation, the regeneration switch 58 becomes open, and the transistor 66 becomes active again, causing the motor 1 A current flows through.

In addition to the embodiment shown in FIG. 8, the same effect can be obtained by connecting the playback switch 58 and the fast-forwarding switch 59 in parallel as shown in FIG.

As is clear from the above embodiments, according to the tape recorder of the present invention, unstable meshing of the gears occurs during operation switching, which is a problem in devices that perform high-speed tape feeding such as fast forwarding and rewinding by gear drive. Since the rotation of the tape running motor is stopped in this state, the occurrence of unpleasant noise is extremely reduced.

Furthermore, in the present invention, the motor is not stopped by opening or closing a power switch, but by turning off only the motor circuit using the two switches and the transistor circuit, while leaving the power switch in the ON state. The power supply is not turned on or off, so no abnormal noise is generated during switching, and this effect is very large and excellent.

[Brief explanation of the drawing]

1 and 2 are plan views showing a tape recorder in a stopped state in an embodiment of the present invention, FIG. 3 is a side view of essential parts of the same tape recorder, and FIG. 4 shows a playback state of the same tape recorder. 5 and 6 are plan views for explaining the process of transitioning from the playback state to the queue state of the same tape recorder, and FIG.
This figure is a plan view showing the queue state of the same tape recorder, FIG. 8 is a circuit diagram of a main part of this embodiment, and FIG. 9 is a circuit diagram of a main part of another embodiment. 1...Motor, 21, 22...Reel stand, 23
~25...Reel stand gear, 16,17...Gear lever, 19-20...Gear, 38...Main switch rod, 45...Switch arm, 50...
Sub switch, 58... Playback switch, 5
9...Fast forward switch, 60...Main switch, 65, 66...Transistor.

Claims (1)

[Claims] 1. A take-up reel stand, a supply reel stand, a gear that can mesh with a gear formed on the reel stand and rotates the reel stand at a constant speed, a gear that rotates at high speed, and a support member that supports each gear; A motor that drives a gear, a constant speed tape feed operation member that moves the support member and meshes the gear with the reel stand, a high speed tape feed operation member, and a main switch that is electrically connected during each of the above operations. a regeneration switch that is in the first state when traveling at a constant speed and remains in the second state otherwise, and a regeneration switch switching member that switches the regeneration switch; and a fast-forward switch that maintains the second state in other cases, a fast-forward switch switching member for switching the fast-forward switch, and a motor rotation control circuit including each of the switches. When a high-speed tape feed operation is performed during the process of changing the gear mesh, the playback switch and the fast-forward switch are simultaneously set to the first state to stop the rotation of the motor, and then the playback switch is set to the second state. 1. A tape recorder characterized in that the motor is activated again to enter a queue or review state.