JPS647416B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an improvement in a tape recorder device equipped with, for example, a motor drive assist mechanism.

[Technical background of the invention and its problems]

In recent years, tape recorder devices equipped with a so-called motor drive assist mechanism, in which each mechanical section can be rapidly controlled using a plurality of motors, have appeared and are becoming popular.

This has the advantage that it can be operated in a so-called soft-touch manner and can be organically combined with an auto-reverse mechanism or the like.

By the way, what is required of this type of tape recorder device is that it can reliably and quickly control each mechanical part according to various operating conditions, be compact, and save power to reduce power consumption. Measures should be taken.

However, conventionally realized motor drive assist mechanisms do not necessarily satisfy the above-mentioned requirements and have many various disadvantages.

For example, the number of parts to be assembled increases, making it difficult to simplify the work. Therefore, it is expensive and not suitable for mass production.

However, there is a demand for a device that can reliably control each mechanical part with an organic and simple configuration without waste, is downsized, and takes power-saving measures to reduce power consumption.

[Purpose of the invention]

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an extremely good tape recorder device that has a simple configuration and is capable of efficiently using transmitted power to save power.

[Summary of the invention]

That is, the present invention provides a tape recorder device that operates a tape recorder mechanism section by transmitting driving force from a drive source via a gear transmission mechanism to a drive body that serves as a drive source for switching operation, in which the gear transmission mechanism is At least one transmission gear is formed as an eccentric gear, and the reduction ratio is varied depending on the magnitude of the load applied to the drive body.

[Embodiments of the invention]

First, before describing one embodiment of the present invention, a basic example of a tape recorder device to which the present invention is applied will be described in detail with reference to the drawings.
That is, FIGS. 1 and 2 are front and back side plan views showing the overall configuration of the tape recorder device. Here, in FIG. 1, a pair of reel stands 32 and 33 are rotatably supported on the front surface side of a main chassis 31 formed in a substantially box shape, at substantially the center thereof. The pair of reel stands 32 and 33 have large diameter gears 34 and 35, respectively.
are coaxially formed.

Further, in the upper part of the figure on the substantially perpendicular bisector of the straight line connecting the rotation center axes of the reel stands 32 and 33, and on the back side of the main chassis 31, there is a reel motor 36 (see FIG. 2) for running the tape. ) is provided. Rotating shaft 361 of this reel motor 36
protrudes toward the surface side of the main chassis 31, and a rotation center portion of a gear 37 is fitted into its tip. A substantially ring-shaped friction member 38 is provided on the front side of the main chassis 31 so as to surround the gear 37, and this friction member 38 has a protrusion 381 corresponding to the reel stands 32, 33. It is formed in one piece. Here, this friction member 38 is in an interlocking relationship with the gear 37 with an appropriate frictional force, and this gear 37
It is adapted to be biased in the directions of arrows C and D depending on the direction of rotation of. Further, a rotating shaft 182 is implanted in the protruding portion 381 of the friction member 38, and a gear 39 that is constantly meshed with the gear 37 is rotatably supported on the rotating shaft 182.

Here, when the gear 37 is rotated counterclockwise in the figure by the reel motor 36, the friction member 3
8 is biased in the direction of arrow D. At that time, the protrusion 1
A gear 39 supported by 81 is meshed with a gear 35 of a reel stand 33, and this reel stand 33 is driven to rotate clockwise in the figure. And gear 3
7 is rotated counterclockwise in the figure by the reel motor 36, the protrusion 1 of the friction member 38 similarly
A gear 39 supported at 81 meshes with a gear 34 of a reel stand 32, and this reel stand 32 is driven to rotate counterclockwise in the figure, allowing the tape (not shown here) to run in forward and reverse directions. . Also,
The reel motor 36 is configured such that its rotational speed and rotation direction change according to the operation of a tape constant-speed running operating member (recording, forward and reverse direction playback) and a tape high-speed running operating member (fast forward, rewind), which are not shown. , which is controlled by a reel motor drive circuit described later. When the tape constant speed and high speed running operation members and the tape run stop operation member (not shown) (including pause) are operated, a logic control circuit (to be described later) is controlled to rotate the reel motor 36 according to the operation. A stopped state can be obtained.

Next, on the main chassis 31, below the reel stands 32 and 33 in the figure, a forward/reverse switching device 40 is disposed as an auto-reverse mechanism including a motor drive assist mechanism to be described later.
A substantially disc-shaped drive unit, such as a main gear cam 41, which will be described later, of the forward/reverse switching device 40 has its rotation center rotatably supported by a rotating shaft 411 implanted in the main chassis 31, and its outer peripheral portion is Teeth 412 are formed.

Here, on the back side of the main chassis 31, a dedicated drive source such as an assist motor 42 is connected to a second drive source.
It is provided as shown in the figure. A gear 43 is rotatably supported on the rotating shaft of the assist motor 42, and this gear 43 has a first transmission gear,
Second and third reduction gears 44, 45, and 46 are sequentially meshed with each other. And the gear 4
A smaller diameter gear of the third reduction gear 46 which is farthest from the main chassis 31 protrudes to the surface side of the main chassis 31,
It meshes with the teeth 412 of the main gear cam 41. Therefore, when the gear 43 is rotationally driven by the assist motor 42, the rotation is transmitted to the main gear cam 41 via the first, second and third reduction gears 44, 45, 46 and is rotationally driven. It is something that Here, the assist motor 42 is controlled by the logic control circuit, which will be described later, to determine the rotational direction and stop (motor lock) state according to the combined operation of the tape constant speed running operating member or the tape constant speed and high speed running operating member. It is controlled by an assist motor control circuit and an assist motor drive circuit.

Further, on the upper surface of the main gear cam 41, a regeneration slider 47 that is slidable in the directions of arrows E and F, which will be described in detail later, and a head slider 48 as a head position control member that is slidable in the directions of arrows G and H are successively installed. It is arranged. Therefore, when the main gear cam 41 is rotationally driven as described above, the playback slider 47 is selectively slid in the direction of the arrow E or F depending on the direction of rotation, causing the tape to run in the forward or reverse direction. , the head slider 48
is slid in the direction of arrow G. that time,
The left and right pinch levers 49 and 50, which will be described in detail later, are selectively rotated to engage with both ends of the head slider 48.
The left and right pinch rollers 51 and 52 rotatably supported by the left and right capstans 53 and 54 are brought into contact with the left and right capstans 53 and 54 via tapes, respectively, and the recording/reproducing head 55 mounted on the head slider 48 is It functions by bringing it into contact with a predetermined surface of the tape to produce a forward or reverse playback (recording) state. Here, the upper recording/reproducing head 55 adjusts the azimuth angle accurately to enable playback (recording) in the forward and reverse directions of tape running, that is, forward and backward movements, and adjusts the azimuth angle to the corresponding track of the tape according to the tape running. The head rotation mechanism 56 for this purpose will be described later. Here, the above left and right capstan 5
3 and 54 are the rotation axes of the left and right flywheels 57 and 58 shown in FIG. 2, respectively;
It is inserted into the main chassis 31 from the back side to the front side without rattling and rotatably.

Here, as shown in FIG. 2, on the back side of the main chassis 31, a main motor 59 is provided on the right side in the figure corresponding to the left and right capstans 53, 54, and this main motor 59 has its rotation axis. A pulley 60 is supported on. A belt 61 is stretched between the pulley 60 and the left and right flywheels 57, 58.
Therefore, the left and right flywheels 57, 58
The rotation of the main motor 59 is transmitted through a belt 61, so that the main motor 59 is constantly rotated clockwise or counterclockwise in the figure.

Further, on the front side of the main chassis 31, an eject member 62 is supported on the left side in the figure so as to be slidable in the directions of arrows I and J in the figure. This eject member 62 is connected to the main chassis 31.
In the figure, it is formed into a substantially rod-like shape extending from the upper end to the lower end. This eject member 62 has a through hole 62 formed at one end thereof.
1 is a sliding portion 31 formed on the main chassis 31;
1, and after loosely inserting the shaft 312 formed in the main chassis 31 into the through hole 622 formed at the other end, the main chassis 31 is pressed by a retainer ring 313 to be slidably supported. It is something that Further, the eject member 62 has a spring 63 engaged between a bent locking piece 623 formed approximately at the center thereof and an engagement shaft 314 formed on the main chassis 31, so that the eject member 62 can be It is biased in the J direction.

Here, a lock portion 624 is formed at one end of the eject member 62.
When the cassette lid (not shown), which is biased in the direction of the normally open state by 24, is closed, a portion of the cassette lid is locked and the closed state is maintained. Then, when the eject operator (not shown) is operated, the eject slider 6
4, the eject member 62 is slid in the direction of arrow I against the biasing force of the spring 63. Then, the lock portion 624 of the eject member 62 separates from the cassette lid, and the cassette lid is opened.

Further, on the main chassis 31, a cassette detection switch 65,
An erroneous erasure prevention mechanism 68 having forward and reverse erroneous erasure prevention switches 66 and 67 is provided.

Next, the forward/reverse switching device 40 including the motor drive assist mechanism will be described. That is, as shown in FIGS. 3, 4, and 5, the rotatable main gear cam 41 is supported on the main chassis 31 in mesh with the small diameter gear of the third reduction gear 46. . The rotary shaft 4 is located on the bottom side of this main gear cam 41.
A curved protruding locking part 412 is disposed at the upper part of the figure in FIG. This pair of return levers 69, 70
, one end of which is connected to the main chassis 3, respectively.
It is rotatably supported by rotating shafts 691 and 701 implanted in 1, and curved portions 692 and 7 are provided at intermediate portions thereof corresponding to the protruding engagement portions 412, respectively.
02 is formed. The pair of return levers 69 and 70 also have curved portions 692 and 7, respectively, with the rotation axis of the main gear cam 41 as a boundary.
02, locking portions 693 and 703 are formed in a connected manner. These locking parts 693, 703 are
It is arranged so as to sandwich a protruding locking portion 315 formed on the main chassis 31. Further, the return levers 69, 70 have engaging portions 694, 704 formed at their other ends, respectively, and a return spring 71 is engaged between the engaging portions 694, 704. Here, the operation of the return mechanism configured as described above will be described later.

Further, a protrusion 413 that protrudes downward in the drawing is formed on the rotating shaft 411 on the upper surface side of the main gear cam 41, and a protrusion 414 is formed in the protrusion 413 approximately in the center thereof.

Here, on the upper surface of the main gear cam 41, the regeneration slider 47 having a substantially inverted T shape is provided with arrows E and F.
It is arranged so that it can freely slide in the direction. This reproduction slider 47 has a curved through hole 471 formed at its central end, and a notch 4 at one end of this through hole 471.
72 is formed. And this through hole 471
A protrusion 413 of the main gear cam 41 is inserted into the main gear cam 41 , and a tip 415 of the protrusion 413 faces a cutout 472 of the through hole 471 .

Furthermore, a substantially T-shaped through hole 473 is formed at one end of the reproduction slider 47.
A sliding portion 316 that is implanted in the main chassis 31 and projects in a T-shape from the side surface is fitted into 73 . Furthermore, this reproduction slider 47 has a through hole 474 formed at the other end, and this through hole 474 has a
After the shaft 317 implanted in the main chassis 31 is loosely inserted, it is held down by a screw 318 and an extension 475 is formed at the center end thereof, extending to the right in the figure. Through hole 4 formed
The shaft 319 installed in the main chassis 31 at 76
(see Figure 1) is inserted. Therefore, the reproduction slider 47 is supported so as to be slidable in the directions of arrows E and F.

Further, the reproducing slider 47 has a recess 477 formed approximately at the center of its lower side, and a notched fitting portion 478 is formed in the recess 477. A part of the head rotation mechanism 56, which will be described in detail later, is engaged with this fitting portion 478.

Further, the reproduction slider 47 has bent portions 72 and 73 formed at one end and the other end, respectively, and locking portions 721 and 731 are formed in the bent portions 72 and 73, respectively. . The locking portions 721, 731 have bent portions 491, 50 of the left and right pinch levers 49, 50, which will be described in detail later.
1 is selectively locked in accordance with the slide of the reproduction slider 47 in the directions of arrows E and F.

Next, on the upper surface of the reproduction slider 47, the head slider 48, which has a substantially inverted T shape, is disposed so as to be slidable in the directions of arrows G and H. This head slider 48 has a recess 481 at the tip of its central end.
is formed, and the shaft 4 implanted between the shafts 691 and 791 of the main chassis 31 is formed in this recess 481.
82 is inserted so that it is slidably guided in the directions of arrows G and H in the figure. The head slider 31 is slid in the direction of arrow G until the bottom of the recess 481 comes into contact with the shaft 482.

Further, a through hole 483 is formed at the central end of the head slider 48 so as to correspond to the rotating shaft 411 of the main gear cam 41.
In the lower end of the figure, a rotation hole 484 is formed in a horizontally elongated manner corresponding to the rotation orbit of the protrusion 414 of the main gear cam 41. And in this through hole 483,
The rotation shaft 411 of the main gear cam 41 is inserted through the rotation hole 484, and the protrusion 414 of the main gear cam 41 is inserted into the rotation hole 484.

Therefore, in the head slider 48, as the main gear cam 41 rotates, the tip 415 of the protrusion 413 of the main gear cam 41 slides the regeneration slider 47 to a predetermined position, and the main gear cam 41 rotates thereafter. As a result, the protrusion 414 engages with a portion of the rotation hole 484,
It is slid into a predetermined position.

The head slider 48 also has bent locking portions 4 formed substantially perpendicularly to the corner portions at both ends of the head slider 48.
85 and 486, respectively. The left and right pinch rollers 51 and 52 are respectively disposed in the bending locking portions 485 and 486. The left and right pinch rollers 51 and 52 are rotatably supported by one end of the left and right pinch levers 49 and 50, respectively, which are formed into a substantially U-shaped side surface, and the other end is planted in the main chassis 31. They are rotatably supported on rotation shafts 492 and 502, respectively. Further, at the other ends of the left and right pinch levers 49 and 50, there are protruding portions 4 corresponding to the bending engagement portions 72 and 73 of the reproduction slider 47.
93 and 503 are formed respectively, and this protrusion 4
Bent portions 491 and 503 are formed in the portions 93 and 503, respectively. Furthermore, torsion springs 74 and 75 are wound around and attached to the rotation shafts 492 and 502 of the left and right pinch levers 49 and 50, respectively.
One end of 5 is the left and right pinch lever 4, respectively.
9 and 50 are engaged with. The other ends of the torsion springs 74 and 75 are connected to the bent locking portion 48 of the head slider 48, respectively.
5,486. Therefore, when the head slider 48 is slid in the direction of the arrow G, the left and right pinch levers 49 and 50 are rotated counterclockwise and clockwise in the figure, respectively, as the head slider 48 slides in the direction of arrow G. At this time, the left and right pinch levers 4
9, 50, one of the bent portions 491, 501 of the protruding portions 493, 503 selectively engages the bent locking portions 485, 486 as the reproduction slider 47 slides in the directions of arrows E and F. The other left and right pinch levers 49 and 50 are rotated to prevent the left and right pinch rollers 5 from rotating.
1 and 52 are the above left and right capstans 53 and 54
It is designed so that it comes into contact with the

Here, a locking portion 487 is formed at one end of the head chassis 48 to correspond to the shaft 317 of the main chassis 31, and a locking portion 488 is formed at the other end of the head chassis 48, and a locking portion 488 is formed at one end of the head chassis 48, and a locking portion 488 is formed at the other end of the head chassis 48.
6. Therefore, the head slider 48 is slid in the direction of the arrow H until its engaging portions 487 and 488 come into contact with the shaft 317 and the sliding portion 316 of the main chassis 31. Here, the head slider 48 is
A spring 76 is engaged between a locking piece 489 formed at the other end and the sliding portion 316 of the main chassis 31, so that it is biased in the direction of arrow H.

Further, a head mounting structure 77 of the head rotation mechanism 56 is attached to the head slider 48 substantially at the center thereof with screws 771. This head mounting structure 77 includes a head base plate 78 and a gear 7.
9 is integrally supported, and a substantially fan-shaped fan gear 80 that meshes with this gear 79 is rotatably supported at its base. Further, a substantially cylindrical head support 81 is attached to the head base plate 78, and an upper recording/reproducing head 55 and an erasing head 82 for a microcassette tape recorder are arranged side by side on this head support 81. It is fitted.

Here, with the head mounting structure 77 attached to the head slider 48, the tape contact surfaces of the upper recording/reproducing head 55 and the erasing head 82 are opposed to the reel stands 32, 33. Further, the fan-shaped gear 80 has a driven portion 80 from its base.
1 is extended, and the bent end portion of this driven portion 801 is interposed within the fitting portion 478 of the reproduction slider 47. Note that even if the head slider 48 is slid in the directions of arrows G and H, the driven portion 8
01 is always interposed within the fitting portion 478 without separating from the fitting portion 478. Therefore, when switching the tape from the forward direction to the reverse direction and from the reverse direction to the forward direction, the playback slider 4
As 7 is slid in the directions of arrows E and F,
The sector gear 80 is rotated about its base.

For example, when the sector gear 80 is rotated counterclockwise in the figure, the gear 79 that meshes with the sector gear 80 is rotated clockwise in the figure. Therefore, as the gear 79 rotates, the head base plate 78
Then, the head support 81 is rotated in the same direction, and the recording/reproducing head 55 and erasing head 82 are rotated exactly 180 degrees. Here, a track change (head movement) is performed when switching between forward and reverse tape running. Further, when the fan-shaped gear 80 is rotated clockwise in the figure, the gear 79, head base plate 78, and head support 81 are rotated counterclockwise in the figure, and the recording/reproducing head 55 and the erasing head 82 are rotated. Of course, it will be returned to its original position.

Further, a pair of locking portions (not shown) are formed in a part of the head base plate 78, and corresponding to the pair of locking portions, the head mounting structure 77 includes:
A pair of screws 772 and 773 are screwed. Therefore, the head base plate 78 is rotated until one of the pair of locking portions comes into contact with the pair of screws 772, 773 of the head mounting structure 77. Therefore, by adjusting the depth of engagement of the screws 772 and 773, the azimuth of the recording/reproducing head 55 and the erasing head 82 can be adjusted. The recording/reproducing head 55 and the erasing head 82 are connected to a recording/reproducing system electric circuit (not shown) via a connection line (not shown).

Further, on the peripheral side of the head support 81,
A pair of arrows are displayed to indicate the tape running direction, and a tape guide part 83 is formed on one side of the arrow to support both ends of the tape in the width direction.

Further, a torsion spring 84 is wound around and engaged with a part of the head mounting structure 77, and one end of the torsion spring 84 is engaged with the center of rotation of the gear 79, and the other end is engaged with the rotational center of the gear 79. is locked to the base of the sector gear 80. Therefore, the head support 78 is stably held in two positions in the forward and reverse tape running states by the biasing force of the torsion spring 84.

Next, the operations of the forward/reverse switching device 40 as an auto-reverse mechanism including the motor drive assist mechanism configured as described above and the return mechanism will be described in detail. First, suppose that the main gear cam 41 is rotationally driven in the counterclockwise direction in the figure by operating the constant-speed tape running operation member (forward playback) as described above in the stopped state as shown in FIG. Then, as shown in FIG. 6, as the main gear cam 41 rotates, the tip 415 of the protrusion 413 is engaged with the right side of the notch 472 of the regeneration slider 47, and the regeneration slider 47 is Slide it in the E direction. Here, as the reproduction slider 47 slides, the recording/reproducing head 55 and the erasing head 82 are rotated by the head rotation mechanism 56 described above.
is rotated in accordance with the tape running direction. At this time, the protrusion 4 of the main gear cam 41
The protrusion 414 of No. 13 is engaged with the right side of the rotation hole 484 of the head slider 48 in the drawing.
Therefore, with the subsequent rotation of the main gear cam 41, the regeneration slider 4 moves as shown in FIG.
7 is not biased in the direction of arrow E because the tip 415 of the protrusion 413 comes into sliding contact with the curved part 471, but the head chassis 48 is not biased in the direction of the arrow E by the protrusion 414 of the protrusion 413. It is urged by G and is slid to a predetermined position.
At this time, the torsion spring 7 is attached to the bent locking portions 485 and 486 of the head slider 48.
The left and right pinch levers 49 and 50, which are engaged via pins 4 and 75, are biased clockwise and counterclockwise in the figure, respectively. Therefore, among the left and right pinch levers 49 and 50, the left pinch lever 49 is locked by the locking portion 72 at one end of the playback slider 47 because the playback slider 47 is located furthest in the direction of arrow E. Rotation is prevented. On the other hand, the right pinch lever 50 is rotated clockwise in the figure without being locked by the locking part 73 at the other end of the reproduction slider 47, and the right pinch roller 52 is moved from the right caps as described above. 54. Here, the assist motor 42, which rotationally drives the main gear cam 41, is supplied with a very small amount of current so that the motor is locked, and the tape is played back in the forward direction.

Here, the return mechanism configured on the lower surface side of the main gear cam 41 is rotated by the rotation of the main gear cam 41 in the counterclockwise direction in the drawing, as shown in FIG. One end comes into contact with the curved part 692 of the return lever 69 on the left side in the figure, and as the return lever 69 rotates, the return lever 69
The rotation shaft 691 resists the spring force of the return spring 71.
It is rotated clockwise in the figure around . At this time, the return lever 70 on the right side in the figure is locked by the protruding locking portion 315 of the main chassis 31 and is not rotated clockwise in the figure. Then, the recording/reproducing head 55 and the erasing head 82 mentioned above
At the end of rotation, that is, when the head slider 48 starts sliding, the protruding engagement portion 412 of the main gear cam 41 is moved along the curved portion 692 of the return lever 69 as the main gear cam 41 rotates, as shown in FIG. , the return lever 69 is further rotated clockwise in the figure. Therefore, as shown in FIG. 10, when the main gear cam 41 rotates so that one end of the protruding engagement part 412 is positioned at one end of the curved part 692 of the return lever 69, rotation is stopped. And the 11th
As shown in the figure, when the head slider 48 has completely slid, the protruding engaging portion 412 of the main gear cam 41 has a substantially central portion that is connected to the return lever 41.
It is in contact with one end of the curved portion 692 of No. 9. At this time, the return lever 69 is biased in the direction of arrow K by the return spring 51 that is partially engaged with the return lever 69.

In addition, in the forward playback state, when the end of the tape arrives (the same applies when operating the operating member when stopped), a tape end detection device (not shown) determines this and supplies current to the assist motor 42. Suppose that it is cut off. Then, as shown in FIG. 12, the head slider 48 is moved back in the direction of arrow H by the biasing force of the return spring 70. Here, as the head slider 48 retreats, the main gear cam 41 is rotated clockwise in the figure by the biasing force of the return spring 71, and starts sliding the head slider 48 as shown in FIG. retreat to position. At this time, the left and right pinch levers 49 and 50, which are respectively engaged with the bending locking parts 485 and 486 of the head slider 48, are rotated clockwise and counterclockwise in the figure, and the left and right pinch levers are rotated clockwise and counterclockwise in the figure. 5
1 and 52 are removed from the left and right capstans 53 and 54.

Here, the main gear cam 41 positioned as described above is thereafter returned to the stop position by the spring force of the return spring 71 of the return mechanism. That is, as shown in FIG. 14, the main gear cam 41 is moved by the spring force of the return spring 71 with its protruding engaging portion 412 slidingly in contact with the curved portion 629 of the return lever 69 on the left side in the figure. As a result, the main gear cam 41 is rotated clockwise in the figure and comes to a stopped state as shown in FIG. 15. At this time, the tip 415 of the protrusion 413 of the main gear cam 41
As the main gear cam 41 rotates clockwise in the drawing, the regeneration slider 47, which has been biased in this direction, is slid in the direction of arrow E and is returned to the stopped position.

And when it is brought back to the stopped state as above,
When the auto-reverse state is set, a reversal signal is sent to the assist motor 42, and the assist motor 42 is driven in reverse. Then,
The main gear cam 41 is reversed and rotated clockwise in the figure, and the forward/reverse switching device 40 is operated to create a regeneration state in the reverse direction. That is,
As shown in FIGS. 16 and 17, as the main gear cam 41 rotates clockwise in the drawings, the tip 415 of the protrusion 413 is engaged with the left side of the notch 484 of the regeneration slider 47. , slide this reproduction slider 47 in the direction of arrow F. here,
As the reproducing slider 47 slides, the recording/reproducing head 55 is rotated in the tape running direction by the head rotating mechanism 56 described above. At this time, the protrusion 414 of the protrusion 413 of the main gear cam 41 is engaged with the left side of the rotation hole 484 of the head slider 48 in the drawing. Therefore, with the subsequent rotation of the main gear cam 41, as shown in FIG.
However, the head slider 48 is urged in the direction of arrow G by the protrusion 414 of the protrusion 413 and is slid to a predetermined position. At this time, this head slider 4
The left and right pinch levers 49 and 50, which are engaged with the bending locking portions 485 and 486 of No. 8 via torsion springs 74 and 75, are biased counterclockwise and clockwise in the figure, respectively. Therefore, among the left and right pinch levers 49 and 50, the right pinch lever 50 is locked by the locking portion 73 at the other end of the playback slider 47 because the playback slider 47 is located furthest in the direction of arrow F. , its rotation is prevented. On the other hand, the left pinch lever 49 is rotated counterclockwise in the figure without being locked by the locking portion 72 at one end of the playback slider 47, and the left pinch roller 51 is moved from the left caps as described above. 53
is brought into contact with. Here, in the same manner as described above, the current supplied to the assist motor 42 is made very small, so that the motor is locked, and the tape is reproduced in the reverse direction.

Here, the return mechanism configured on the lower surface side of the main gear cam 41 is configured such that the other end of the protruding engagement portion 412 is moved to the right side in the figure as the main gear cam 41 rotates clockwise in the figure. The return lever 70 is engaged with the curved portion 702 of the return lever 70, and the return lever 70 resists the spring force of the return spring 71 to rotate the rotation shaft 70.
1 in the counterclockwise direction in the figure. At this time, the return lever 69 on the left side in the figure is locked by the protruding engagement portion 315 of the main chassis 31 and is not rotated counterclockwise in the figure.
With the subsequent rotation of the main gear cam 41, the return lever 70 on the right side in the figure is further rotated counterclockwise in the figure by the protruding engagement portion 412. In the regenerating state in the reverse direction in which the head slider 48 has completed sliding, the protruding engaging portion 412 of the main gear cam 41 is in a state in which its approximately central portion is engaged with one end of the curved portion 702 of the return lever 70. This is what has been done.

Next, a circuit for controlling the tape recorder will be explained. That is, as shown in FIGS. 19 and 20, the logic control circuit 85 has its power supply connection end connected to the power supply (+B), and its ground end (GND) grounded. The forward playback input terminal (F.
PLAY), reverse playback input end (P.PLAY), recording input end (REC), fast forward input end (FF), rewind input end (REW), stop input end (STOP) and pause input end (PAUSE). One end of each is correspondingly connected to the other ends of switches 86-92, which are both grounded. Therefore, when the switches 86 to 92 are operated, the logic control circuit 85 controls the input terminals F.PLAY and R corresponding to the switches 86 to 92.
PLAY, REC, REW, FF, STOP and PAUSE
is set to the ground potential, that is, low level (hereinafter referred to as L level). Then, the forward play output end (F.out), reverse play output end (R.out), and recording output end (REC.
out), rewind output terminal (REW.out), fast forward output terminal (FFout), and pause output terminal (PAUSE.out) become high level (hereinafter referred to as H level), and based on this signal, the assist motor 42 and the reel motor 36 and the main motor 59 to run and stop the tape.

Here, the assist motor 42 is connected to an intermediate point of transistors Q ₁ , Q ₂ , Q ₃ , and Q ₄ connected in a bridge configuration. This transistor Q ₁ ,
Of Q ₂ , Q ₃ , and Q ₄ , each transistor on the lower side of the diagram
Q ₁ and Q ₂ each have a diode base.
It is connected to the forward reproduction output terminal (F.out) and the reverse reproduction output terminal ( _R.out ) of the logic control circuit 85 via D _{1 ,} D ₂ and resistors R 1 , R 2 .
Furthermore, among the transistors Q ₁ , Q ₂ , Q ₃ , and Q ₄ , the bases of the transistors Q ₃ and Q ₄ on the upper side in the figure are connected to each other's collectors through resistors R ₃ and R ₄ , respectively. and their emitters are respectively connected to a power supply (+B) via a transistor _Q5 configured to control the current of the assist motor 42. This transistor _Q5
The base of is connected to the collector of a transistor Q 6 through a Zener diode D ₃ connected to the power supply (+B) through a resistor R ₅ , and the base of this transistor _{Q 6 is} connected to a diode D ₄ and a resistor.
It is connected to the signal output terminal (T.out) of the logic control circuit 85 via _R6 .

Further, one input terminal of NAND circuits _N1 and _N2 is connected to the fast forward output terminal (FFout) and rewind output terminal (R.out) of _the logic control circuit 85, respectively. The other input terminal of _N2 is commonly connected to the output terminal of a NAND circuit _N3 connected to a selection switch 93, which will be described later. Further, the output terminals of the NAND circuits N ₁ and N ₂ are commonly connected to the input terminals of the NAND circuits N ₄ and N ₅ that provide a normal rotation or reverse rotation signal to the assist motor 42, respectively, and nand circuit
Connected correspondingly to the input end of _N6 . here,
The output terminals of the NAND circuits N ₄ and N ₅ are connected to the connection terminals 94 and 95 of the assist motor drive circuit,
The assist motor 42 is configured to rotate forward or reverse in response to the operation of the switch 86 or 87. The output end of the NAND circuit _N6 is connected to one input end of the NAND circuit _N7 , and the other input end of the NAND circuit _N7 is connected to the position detection switch 96 via a resistor _R7 . , its output end is connected to one input end of the NAND circuit _N8 . Furthermore, each input terminal is a NAND circuit _N6
NAND circuit N ₉ commonly connected to the output terminal of NAND circuit N ₁₀ through capacitor C ₁ and resistor R ₈
is connected to one input end of the The other input terminal of this NAND circuit _N10 is connected across the other side to the other input terminal of the NAND circuit _N8 , and its output terminal is a NAND circuit that extracts a current control signal via a capacitor _C2 . Connected to circuit N ₁₁ . The output end of this NAND circuit _N11 is connected to the connection end 97 of the assist motor drive circuit.

Next, the reel motor 36 is connected between the midpoints of transistors Q ₇ , Q ₈ , Q ₉ , and Q ₁₀ that are connected in a bridge configuration substantially similar to the assist motor 42 . Of these transistors Q ₇ , Q ₈ , Q ₉ , and Q ₁₀ , the transistors Q ₇ and Q ₈ on the lower side of the figure have their bases connected to diodes D ₅ and D ₆ and resistors R ₉ and
It is connected to the forward reproduction output terminal (F.out) and the reverse reproduction output terminal (R.out) of the logic circuit 85 via _R10 . Moreover, the above transistor Q ₇ ,
Each transistor on the upper side in the diagram among Q ₈ , Q ₉ , and Q ₁₀
Q ₉ and Q ₁₀ have their bases resistors R ₁₁ and R ₁₂ respectively
The emitters thereof are connected to the power supply (B) via transistors _Q11 each configured to control the current of the reel motor 36. this transistor
The base of Q ₁₁ is connected to the collector of transistor Q 12 through a Zener diode D ₇ connected to the power supply (B) through a resistor R ₁₃ , and the base of this transistor Q ₁₂ is connected to the collector of transistor Q ₁₂ in common with diode D ₈ and resistor R ₁₄ , through diode D ₉ and resistor R ₁₅ ,
These are connected to the forward reproduction output terminal (F.out) and the reverse reproduction output terminal (R.out) of the logic control circuit 85, respectively.

The main motor 59 has one end grounded and the other end connected to the collector of the transistor _Q13 . This transistor _Q13 has its emitter connected to the power supply (B), and its base connected to the collector of the transistor _Q12 via a resistor _R16 .

That is, when a power switch (not shown) is operated to perform playback in the forward direction, the signal output terminal (T.out) of the logic control circuit 85 is set to the H level. Therefore, if the switch 86 is operated at time _T1 as shown in FIG _. At the same time, the forward reproduction output terminal (F.out) becomes H level, and the transistor _Q1 is turned on. Then,
The assist motor 42 is driven in normal rotation by being supplied with enough current to drive in a predetermined direction for a predetermined time (until time _T2 ). Therefore, as described above, the main gear cam 41 is rotationally driven to operate the forward/reverse switching device and function to run the tape in the forward direction. At this time, in conjunction with this switching operation, the aforementioned head rotation mechanism 56 is operated to rotate the recording/reproducing head 5.
5 is brought into contact with the tape surface in accordance with the tape running direction, and the right pinch lever 50 is rotated to bring the right pinch roller 52 into contact with the right capstan 54 via the tape. At this time, the signal output terminal (T.out) of the logic control circuit 85 becomes H level, and the transistor _Q6 is turned on. Therefore,
The assist motor 42 is supplied with a small predetermined current to be brought into a motor lock state, and the tape is then played back in the forward direction.

On the other hand, the reel motor 36 is driven by turning on transistors Q ₇ and Q ₁₂ at time T ₂ when the assist motor 42 is motor-locked. Therefore, this reel motor 36 is driven at a rotational speed and a rotational direction corresponding to the constant speed running of the tape in the forward direction, and as described above, the gear 39 is connected to the gear 39 of the reel stand 33.
The tape meshes with the tape to run the tape in the forward direction at a constant speed.

Here, the main motor 59 is driven at time _T1 when the forward playback switch 86 is operated, and the transistor _Q13 is turned on. and,
As described above, the rotation of the main motor 59 is transmitted to the left and right capstans 53 and 54 via the left and right flywheels 57 and 58, respectively.

Next, suppose that the switch 87 is operated at time _T1 in order to perform reproduction in the reverse direction while the power switch is operated. Then, in the same way as described above, the signal output terminal (T.out) of the logic control circuit 85 becomes L level, transistor _Q6 is turned off, and the reverse direction reproduction output terminal (R.out) is turned off.
becomes H level, and transistor _Q2 is turned on. Then, the assist motor 42 receives enough current to be driven in a predetermined direction for a predetermined time (until time _T2 ).
is supplied and driven in reverse. Therefore, as described above, the main gear cam 41 is rotationally driven to operate the forward/reverse switching device to run the tape in the reverse direction. At this time, in conjunction with this switching operation, the aforementioned head rotation mechanism 56 is operated to bring the recording/reproducing head 55 into contact with the tape surface in accordance with the tape running direction, and the left pinch lever 49 is rotated. The left pinch roller 51 is brought into contact with the left capstan 53 via the tape. At this time,
Similar to the above-described forward direction reproduction state, the signal output terminal (T.out) of the logic control circuit 85 becomes H level, and the transistor _Q6 is turned on. Therefore, the assist motor 42 is supplied with a small predetermined current to be brought into a motor lock state, and the tape is then played back in the reverse direction.

On the other hand, the reel motor 36 is driven by turning on transistors _Q12 and _Q8 at time _T2 when the assist motor 42 is motor-locked. Therefore,
This reel motor 36 is driven at a rotational speed and rotational direction corresponding to the constant speed running of the tape in the reverse direction, and as described above, the gear 39 is connected to the gear 39 of the reel stand 32.
The tape meshes with the tape to run the tape in the reverse direction at a constant speed.

Here, the main motor 59 is driven by turning on the transistor _Q13 at time _T1 when the switch 87 is operated, as in the above-described forward direction regeneration.

Further, when the switch 89 is operated to perform fast-forward tape running, a fast-forward circuit (not shown) connected to the fast-forward output terminal (FFout) of the logic control circuit 85 causes the reel motor 36 to rotate at a rotational speed corresponding to the tape fast-forward state. It is driven in the rotational direction, and stable tape fast-forwarding is achieved.

Here, when the switch 90 is operated to run the rewind tape, the reel motor 36 is controlled by a rewind circuit (not shown) connected to the rewind output terminal (REW.out) of the logic control circuit 85.
is driven at a rotational speed and rotational direction corresponding to the tape rewinding state, and stable tape rewinding is achieved.

It is also assumed that the switches 86 and 89 are operated in combination to perform fast-forward playback (queue).
Then, the selection switch 93 is turned on, and the output terminal of the NAND circuit _N3 becomes L level, and the fast forward output terminal (FFout) of the logic control circuit 85 is turned on.
becomes H level. Therefore, the output terminal of the NAND circuit _N4 becomes H level, transistor _Q1 of the assist motor drive circuit is turned on, and transistor _Q6 is turned off as described above, which is sufficient to drive the assist motor 42 in a predetermined direction. Current is supplied to drive the motor in forward rotation. Therefore, the main gear cam 41 is rotationally driven to operate the forward/reverse switching device.
It functions to run the tape in the forward direction, and also rotates the recording/reproducing head 55 in accordance with the tape running direction. Thereafter, as described above, the head slider 48 is slid and the recording/playback head 55 lightly touches the tape surface, and before the pinch roller 52 comes into contact with the right capstan 54, the position detection switch 96 is activated.
is turned off. Then, the NAND circuit N ₆ , N ₇ ,
N ₈ , N ₉ , N ₁₀ causes the output terminal of NAND circuit N ₁₁ to become H.
level, and transistor _Q6 of the assist motor drive circuit is turned on. Therefore, a small amount of current is supplied to the assist motor 42, the motor is locked, and fast-forward playback (queue) is performed.

Here, it is assumed that the switches 87 and 90 are operated in combination in order to perform rewind playback (review). Then, the selection switch 93 is turned on, the output terminal of the NAND circuit _N3 becomes L level, and the rewinding output terminal of the logic control circuit 85 becomes H level.
level. Therefore, the output terminal of the NAND circuit _N5 becomes H level, transistor _Q2 of the assist motor drive circuit is turned on, and transistor _Q6 is turned off as described above, which is enough to drive the assist motor 42 in a predetermined direction. A current is supplied and the drive is reversed. Therefore, the main gear cam 41 is rotationally driven to operate the forward/reverse switching device.
It functions to run the tape in the forward direction, and also rotates the recording/reproducing head 55 in accordance with the tape running direction. Thereafter, the head slider 48 slides in the same way as in fast-forward playback, the recording/reproducing head 55 lightly touches the tape surface, and before the left pinch roller 51 comes into contact with the left capstan 53, the position detection switch 9 is activated.
6 is turned off. Then, the NAND circuit N ₆ , N ₇ ,
N ₈ , N ₉ , N ₁₀ causes the output terminal of NAND circuit N ₁₁ to become H.
level, and transistor _Q6 of the assist motor drive circuit is turned on. Therefore, a minute current is supplied to the assist motor 42, the motor is brought into a locked state, and rewind playback (review) is performed.

Here, in the tape recorder device which is a basic example as described above, one embodiment of the present invention will be described in detail below with reference to the drawings. Second
FIG. 2 shows details of a transmission mechanism for rotationally driving the main gear cam 41 in order to make the above-mentioned forward/reverse switching device 40 correspond to the tape running direction. That is, the gear 43 supported by the rotating shaft of the assist motor 42 meshes with the large-diameter gear 44B of the first reduction gear 44, and the small-diameter gear 44A of the first reduction gear 44 meshes with the gear 43 supported by the rotating shaft of the assist motor 42. The large-diameter gear 45A of the second reduction gear 45 is engaged. and,
The small diameter gear 45B of the second reduction gear 45 is connected to the large diameter gear 46A of the third reduction gear 46.
The teeth 412 of the main gear cam 41 are meshed with a small-diameter gear 46B, the details of which will be described later, of the third reduction gear 46.

Therefore, the main gear cam 41 is rotated as described above by transmitting the rotational force of the assist motor 42 via the first, second, and third reduction gears 44, 45, and 46. .

By the way, the small-diameter gear 46B of the third reduction gear 46 moves the regeneration slider 47 with respect to the main gear cam 41 so that the left or right pinch rollers 51, 52 move to the left or right capstan 5.
3 and 54 (see FIG. 1), it is eccentrically formed so that the reduction ratio is maximized.

That is, as shown in FIG. 23, the meshing relationship between the main gear cam 41 and the small diameter gear 46B of the third reduction gear 46 is such that the recording/reproducing head 55 moves together with the head slider 48 as described above.
At the PLAY (playback/recording) position where the erasing head 82 comes into contact with a tape (not shown), the rotation angle θ (deg) of the main gear cam 41 is increased to eccentrically increase the reduction ratio. Therefore, the main gear cam 41 is moved from the position where the left or right pinch rollers 51, 52 start contacting the left or right capstans 53, 54 (rotation angle θ is approximately 69 (deg)), as shown in FIG. As the load force starts to increase, the left or right pinch rollers 51, 52 move to the left or right capstan 53,
54, the contact completion position (rotation angle θ is approximately 85
(deg)) where the load force is maximum.

In this way, the driving force of the main gear cam 41 is
By changing the reduction ratio of the left or right pinch rollers 51, 52 to the left or right capstan 53, 54 so that it reaches its maximum at the contact completion position (PLAY position), power consumption can be reduced. This can greatly contribute to power saving measures.

Note that, according to the present invention, the invention is not limited to the above-mentioned embodiments, but for example, efficiency can be improved by arranging an eccentric gear for a drive body to which rotational force is transmitted, whose load force increases as the rotation occurs. It can be driven well and is more effective. Therefore, it goes without saying that various modifications can be made without departing from the spirit of the invention.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to provide an extremely good tape recorder device that has a simple configuration and can take power saving measures by efficiently using transmitted power.

[Brief explanation of drawings]

FIG. 1 is a front side plan view showing the overall configuration of a basic example of a tape recorder device to which this invention is applied, FIG. 2 is a back side plan view of the same, and FIG. FIG. 4 is a plan view showing the structure of the front side of the main gear cam; FIG. 5 is a plan view showing the structure of the return mechanism disposed on the back side of the main gear cam; FIG. 7 are plan views showing the operation in FIG. 4, FIGS. 8 to 15 are plan views showing the operation in FIG. 5, and FIGS. 16 to 18 are plan views showing the operation in FIG. 4. 19 is a circuit configuration diagram showing an example of each drive circuit for applying appropriate current to the assist motor, reel motor, and main motor. FIG. 20 is a control circuit for the assist motor during high-speed tape running. FIG. 21 is a block circuit configuration diagram showing one example; FIG. 21 is a timing diagram showing the high speed running and stopping switch, the output terminal of the logic control circuit, and the signal state of each motor; FIG. FIG. 23 is a plan view showing the main parts of the tape recorder device, FIG. 23 is a state diagram showing the positional relationship of the magnetic head with respect to the rotation angle of the main gear cam in FIG. 22, and FIG.
23 is a state diagram showing the positional relationship of each mechanical part with respect to the rotation angle and load of the main gear cam shown in FIG. 22. FIG. 31...Main chassis, 32...Reel stand,
33... Reel stand, 34, 35... Gear, 36...
... Reel motor, 37 ... Gear, 38 ... Friction member, 39 ... Gear, 40 ... Forward/reverse switching device, 41
...Main gear cam, 42...Assist motor,
43... Gear, 44... First reduction gear, 45...
...Second reduction gear, 46...Third reduction gear, 4
7...Playback slider, 48...Head slider,
49...Left pinch lever, 50...Right pinch lever, 51...Left pinch roller, 52...Right pinch roller, 53...Left capstan, 54...Right capstan, 55...Recording/playback head, 56... Head rotation mechanism, 57...Left flywheel, 58...
...Right flywheel, 59...Main motor, 6
0...Pulley, 61...Belt, 62...Eject member, 63...Spring, 64...Eject slider, 65...Cassette detection switch, 66,
67... Erroneous erasure prevention switch, 68... Erroneous erasure prevention mechanism, 69, 70... Return lever, 71... Return spring, 74... Torsion spring, 75...
...Torsion spring, 76...Spring, 77...
...Head mounting structure, 78...Head base plate, 79...
... Gear, 80 ... Fan-shaped gear, 81 ... Head support, 82 ... Erasing head, 83 ... Tape guide section, 84 ... Torsion spring, 85 ... Logic control circuit, 86 ... Switch, 87 - 92
...Switch, 93...Selection switch, 94,9
5... Connection end, 96... Position detection switch, 97
... Connection end, 44A ... Large diameter gear, 44B ...
Small diameter gear, 45A... Large diameter gear, 45B...
Small diameter gear, 46A... Large diameter gear, 46B...
Small diameter gear.

Claims (1)

[Claims] 1. In a tape recorder device that operates a tape recorder mechanism by transmitting driving force from a drive source to a drive body serving as a drive source for switching operation via a gear transmission mechanism, at least one transmission gear of the gear transmission mechanism A tape recorder device, characterized in that it is formed as an eccentric gear, and is configured to vary the reduction ratio from small to large depending on the magnitude of the load applied to the drive body.