JPS6220617B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tape recorder, and in particular to an improvement in its tape drive mechanism.The present invention relates to a tape recorder, and in particular to an improvement in its tape drive mechanism. The purpose is to prevent gear noise from occurring when the gears are in an unstable meshing state.

In conventional tape recorders of this type, when rewinding from a playback state, a so-called review operation, the gear train involved in rewinding shifts from a non-meshing state to an engaged state, but during this displacement process, the rotating Since the drive side gear and the driven gear are in an unstable meshing state, the gear noise at that time is naturally much louder than the gear noise when the switching operation is completed and the normal meshing state is achieved, which may be harmful to the user. It was making me feel uncomfortable.

Therefore, the present invention is intended to prevent the generation of large gear noise during the operation switching and to smoothly perform the operation switching.One embodiment thereof will be described below in detail with reference to the drawings.
In the figure, 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 base plate 2, and a thrust bearing disposed on a lower base plate 8 disposed below the base plate 2. It is rotatably pivotally connected by 9. The main gear 10 is rotatably connected by a main gear shaft 11 disposed approximately in the center of the base plate 2 and the lower base plate 8. Further, a counter pulley 13 is rotatably mounted on a shaft 12 located between the motor 1 and the flywheel 6 on the upper substrate 2. The motor pulley 4, counter pulley 13, flywheel 6, and main gear 10 are connected by a single endless belt 14, so that the rotation of the motor 1 is transmitted thereto. As is clear from FIG. 2, only the counter pulley 13 is constructed 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.

A gear lever shaft 15 is disposed concentrically with the main gear shaft 11 and on the opposite side of the 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 attached to the take-up gear lever 16, and the take-up gear 18 is always connected to gear 1 of the main gear 10.
0a, and the fast forward gear lever 17 has a rewind gear 19,
The rapid-forwarding gears 20 are rotatably connected in a mutually meshed state.

Take-up reel stand 21 and supply reel stand 22
is rotatably connected to the lower substrate 8, and is 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 rotates via a known friction mechanism. It has a supply reel gear 25 that rotates integrally with the supply reel gear 25.

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, a motion shaft 27 established at the other end is inserted into a small hole 16a provided through the winding gear lever 16. In addition to the above-mentioned oval hole 16a, the winding gear lever 16 has another oval hole 16b, into which a shaft 29 provided in a fast-forwarding control rod 28 is inserted and engaged. The fast-forward control rod 28 is pivotally mounted to be slidable in the direction of arrow A-A' on the upper substrate 2, and a control shaft 31 with a roller 30 rotatably pivoted is installed approximately in the center thereof, which is similar to the above-mentioned control shaft 31. It is inserted into the through hole 2c of the substrate 2. The regeneration rod 32 is pivotally mounted to be slidable in the direction of arrow B-B' on the upper substrate 2, and is biased in the direction of arrow B' by a regeneration rod spring 33 suspended between one end 32a of the rod 32 and the upper substrate 2. has been done. The regeneration rod 32 is also provided with button shafts 35, 36 and a lock pawl 32b for fixing the regeneration button 34. A pinch roller alarm 38 to which a pinch roller 37 is rotatably mounted, a recording/playback head 39, and a tape guide 4
A head board 41 having a substantially inverted T-shape on which 0 etc. are mounted is pivotally mounted on the upper board 2 so as to be slidable in the direction of the arrow B-B', and through holes 41a and 41b in the substantially central part are provided with playback rods. Button shafts 35 and 36 provided at 32 are inserted, and the head board 41 is brought into elastic contact with the playback rod 32 by a motion spring 42 whose ends are respectively latched to the button shaft 33 and the head board 39.
Further, the tip end 41c of the head board 41 is connected to the roller 30.
A V-shaped inclined surface is formed correspondingly. Further, a switch arm 43 rotatably supported on the upper board 2 is disposed near the other end 41d of the head board 41, and the switch arm 41 is always rotated counterclockwise by a spring 44. is biased to rotate.

A fast-forwarding rod 45 and a rewinding rod 46 (see FIG. 2) are pivotally attached to the back surface of the upper substrate 2 so as to be slidable in the direction B-B', and near the tips of each one are
Pressure contact portions 45a, 4 for fast-forward control lever 47
6a is formed, and the switch rod 48
Actuating pins 49, 50 are provided for actuating. The fast-forward control lever 47 has an inverted triangular shape and is connected to a fast-forward rod 45 and a rewind rod 4 on the back side of the upper board 2.
6 and a hole 47a that is transparent in the center.
The control shaft 29 is inserted into the step part 47, and is biased in the direction of arrow B' by a control lever spring 51 whose one end is locked to the upper board element.
b, 47c are fast forward rod 45 and rewind rod 4
They are in pressure contact with the pressure contact portions 45a and 46a of No. 6, respectively. Further, lock pins 52 and 53 are provided at the other ends of the fast forwarding rod 45 and the rewinding rod 46. The switch rod 48 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 48a and 48 corresponding to the operating pins 49 and 50.
8b, and has a rising portion 48c at one end, and is always urged in the direction of arrow A' by a spring 54. A playback switch 55 and a fast forward switch 56 are arranged on the back surface of the upper substrate 2 in correspondence with the switch arm 43 and switch rod 48. The stop rod 57 is pivotally attached to the back surface of the board 2 so as to be slidable in the direction of arrow B-B', is provided with a lock release pin 58, and is biased in the direction of arrow B' by a stop rod spring 59. .

Lock rods (not shown) are pivotally mounted on the upper substrate 2 so as to be able to slide freely in the direction of the arrow A-A', and are connected to the reproducing rod 32, the fast-forwarding rod 45, and the rewinding rod 4.
6 and a stop rod 59, and is configured so that each operating section can be locked using a known method.

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

1 and 2 show the tape recorder of this embodiment in a stopped state. In this state, the playback switch 55 and the fast-forward switch 56 are both open, so-called off, and the tape running motor is turned off. 1 is stopped. If the regeneration rod 32 is operated in the direction of arrow B by pressing the regeneration button 34 from this stopped state, the regeneration rod 32 is held locked at the position shown in FIG. At this time, the head board 41 which is in elastic contact with the reproducing rod 32 by the force of the spring 42 also moves together with the reproducing rod 32 in the direction of arrow B, and the pinch roller 37 is pressed against the capstan 5, and the head board 41 is moved in the direction of arrow B. The end portion 41d rotates the switch arm 43 and the regeneration switch 5
5 is short-circuited, so-called on state, and motor 1
A predetermined playback state can be obtained by activating and starting tape running.

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 45a of the fast-forwarding rod 45 presses one bottom stepped portion 47b of the fast-forwarding control lever 47, so that the fast-forwarding control lever 45 resists the biasing force of the control lever spring 51. Then, it rotates counterclockwise about the other bottom stepped portion 47c as a fulcrum. During this rotation, the through hole 4 of the fast-forward control lever 47
7a is engaged with the control shaft 31, the fast-forward control rod 28 moves in the direction of arrow A', and the winding gear lever 1, which is therefore engaged with the shaft 29, moves in the direction of arrow A'.
6 and the fast-forward gear lever 17 engaged with the take-up gear lever 16 are rotated clockwise, and the mesh between the take-up gear 18 and the second take-up reel gear 24 is disengaged. Further, at this time, due to the rotation of the fast-forward gear lever 17, the rewinding gear 19 approaches the internal gear 10b, but is not yet in contact with it.
Further, as the fast-forwarding control rod 28 moves in the direction of the arrow A', the head board 41 in contact with the roller 30 is moved so that the inclined surface of the recessed portion 41c at its tip is received by the arrow A'.
The pinch roller 3 moves in the direction of arrow B' due to the component force in the B' direction, that is, moves slightly backward from the playback position.
At the same time that the pressure contact of the switch 7 to the capstan 5 is released, the switch arm 43 is also rotated counterclockwise by the biasing force of the spring 44, the regeneration switch 55 is opened, and the motor 1 is stopped. If the fast-forwarding rod 45 is further pushed in the direction of arrow B from the state shown in FIG. 5, the fast-forwarding gear lever 17 will rotate greatly as shown in FIG. The gear 20 is brought into mesh with the first take-up reel gear 23. However, in this state, the regeneration switch 55 and the fast forward switch 56 are still open, so the motor 1 remains stopped. If the fast-forwarding rod 45 is further pushed in the direction of arrow B from the state shown in FIG. Move in the direction of arrow B. Due to this movement of the switch rod 48, the fast forward switch 56 is short-circuited, the motor 1 is started, and the internal gear 10b and rewind gear 1, which are already in mesh, are brought into a short-circuited state.
9. Rapid feed gear 20, first take-up reel gear 23
With the gear train, the take-up reel table is rotated at high speed while the head is in the reproducing state in contact with the tape to obtain a predetermined cue state.

If the pressing operation of the fast-forward rod is stopped in this queue state, the process returns to the playback state shown in FIG. 4 through the reverse process. The fast-forward control rod 28 also controls the operation when performing a rewind operation, so-called review operation, from the playback state.
The moving direction of the winding gear lever 16 and the rotating direction of the fast-forwarding gear lever 17 change, and the reel stand that is rotated at high speed becomes the supply reel stand, so further explanation will be omitted.

The above describes the fast-forwarding and rewinding operations from the playback state, so-called cue and review operations.However, in the fast-forwarding and rewinding operations from the stopped state, first, the fast-forwarding gear 20, which is the drive gear for high-speed forwarding,
After the rewind gear 19 is brought into mesh with the reel stand gears 23 and 25, the switch rod 48 is moved, the fast forward switch 56 is shorted, the motor is started, and predetermined fast forward and rewind operations are performed. It can be done.

In the above embodiment, independent switches were provided for playback and fast forwarding, but if a switch mechanism as shown in FIG. 8 is used, the same effect can be achieved with a single switch.

As described above, according to the tape recorder of the present invention, when the gears are in unstable meshing state during operation switching, which is a problem with devices that perform high-speed tape feeding operations such as fast forwarding and rewinding by gear drive, tape running is prevented. Since the rotation of the motor is stopped, no unpleasant noise is generated, and its practical effects are great.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing a tape recorder in a stopped state according to an embodiment of the present invention, FIG. 2 is a plan view showing a tape drive mechanism of the same tape recorder in a stopped state, and FIG. 3 is a main part of the same tape recorder. FIG. 4 is a side view, FIG. 4 is a plan view showing the playback state of the tape recorder, FIGS. 5 and 6 are plan views for explaining the process of transitioning from the playback state to the queue state of the tape recorder, and FIG. 8 is a plan view showing the queue state of the tape recorder, and FIG. 8 is a perspective view showing another example of the motor drive switch. 1...Motor, 21, 22...Reel stand, 23
~25... Reel stand gear, 17... Gear lever,
19-20...Gear, 28...Fast-forward control rod, 32...Regeneration rod, 41...Head board,
43... Switch arm, 45... Fast forwarding rod, 46... Rewinding rod, 48... Switch rod, 55... Playback switch, 56... Fast forwarding switch.

Claims (1)

[Claims] 1. A supply reel stand and a take-up reel stand, a high-speed feed gear that can mesh with a gear formed on the reel stand and rotates the reel stand at high speed, a support member that supports this high-speed feed gear, and a support member that supports the high-speed feed gear. a tape high-speed feed operation member that moves the support member to mesh the high-speed feed gear with the gear of the reel stand; and a tape high-speed feed operation member that is operated by the high-speed feed operation member to rotate the motor. A control switch is provided, and when the tape high-speed feed operation member is operated, the support member is operated before the switch and the motor starts rotating after the gears are engaged and before the tape high-speed feed operation is performed. A tape recorder characterized in that, when the motor is in a rotating state, electricity to the motor is temporarily stopped at the beginning of a high-speed tape feeding operation.