JPS5952446A - Tape recorder - Google Patents

Abstract

PURPOSE:To simply and surely detect the head position controlled with a motor drive assist mechanism, by selecting an engaging point of a switch operating member so as to operate a head position detecting switch at a prescribed position of a head position control member. CONSTITUTION:The switch operating member 21 is made freely turnably in the arrow directions C, D by taking three engaging points a, b, c as fulcrums to a long hole 21a in the form of three consecutive circles having the said engaging points at the middle, because a guide member 23 implanted on a main chassis 31 is engaged elastically, and a bias force is given in the arrow D with a spring 24 tensed between the tip and the main chassis 31 normally. The shift of the elastic engaging section between the long hole 21a and the guide member 23 of the switch operating member 21 among the three engaging points a, b, c suitably means that the operating position of the head position detecting switch is changed.

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 a motor drive assist mechanism.

[Technical Background of the Invention and Problems Therewith] Recently, in tape recorder devices, the Herad slider as a head position control member is moved to a predetermined position by a motor exclusively for assisting, instead of using the conventional manual method. A so-called motor drive assist mechanism has been developed to enable dynamic control.

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 to ensure the sliding control of the head slide according to various operating conditions, and ultimately to set the head position to an accurate position corresponding to the operating conditions. It's about getting.

However, none of the conventionally realized motor drive assist mechanisms can fully satisfy the above-mentioned requirements, and they have some disadvantages.

For example, it is difficult to easily set, detect, and adjust the position of the head whose sliding is controlled by the head slider. For this reason, in particular, accurate and smooth cueing and revving operations, etc., tend to be hindered.

In this case, of course, setting the head position includes setting the head to an operating state and setting the head from an operating state to a stopped state.

However, in order to set the head position from the operating state to the stopped state, it is required to be able to return the head slider smoothly and reliably to the operating state in any case. It is desired that the effective torque margin of the engine is not reduced.

[Purpose of the invention]

Therefore, the present invention has been made in view of the above points, and provides an extremely good tape recorder that has been improved so that the head position controlled by the motor drive assist mechanism can be easily and reliably detected. The purpose is to serve the equipment.

[Summary of the invention]

That is, the tape recorder device according to the present invention includes a motor drive assist mechanism that moves a head position control member from a stop position to an operating position 1 when an assist motor is driven, and one end of which is located on a movement path of the head position control member, The other end is engaged with the operating shaft of the head position detection switch, and the middle part has a plurality of locking points and includes a switch operating member that is rotatably and elastically engaged with the guide member,
By selecting the locking point of the switch actuation part,
The present invention is characterized in that the assist motor can be controlled to a predetermined state by operating the head position detection switch at a predetermined position taken by the head position control.

[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 4 to 11 plan views showing the overall configuration of the tape recorder device. Here, in FIG. 1, on the front side of the main chassis 31 formed in a substantially rectangular shape, a pair of reel stands 32, 3.
9 are rotatably supported. This pair of reel stands 32, 33 have large diameter gears 34, 35, respectively.
are coaxially formed.

Frozen, the above reel stand 32, ? A reel motor 36 (see FIG. 2) for running the tape is provided at the upper part of the figure on the substantially perpendicular bisector of the straight line connecting the rotation center axes of No. 3 and on the back side of the main chassis 31. . The rotation shaft 36 of this reel motor 36 is attached to the main chassis 3.
The rotation center portion of the gear 37 is fitted into the tip of the protruding portion. 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.
8 has a protrusion 38 corresponding to the reel stand 3 and 33.
are integrally formed. Here, this friction part old 38
is in an interlocking relationship with the float 37 with an appropriate h≦friction force, and the arrow (Q(0)
It is made to be biased in the direction.

Further, the rotating shaft 1 is attached to the protrusion 38 of the friction member 38.
82 is implanted, and a gear 39 that is always in mesh with the gear 37 is rotatably supported on this rotating shaft 182.

Here, when the gear 37 is rotated counterclockwise in the figure by the reel motor 36, the rubbing member 38 moves as shown by the arrow (D).
biased in the direction. At this time, the gear 39 supported by the protrusion 181 is meshed with the gear 35 of the reel stand 33, and the reel stand 33 is driven to rotate clockwise in the figure.

Then, when the gear 37 is rotated counterclockwise in the drawing by the reel motor 36, the gear 39 supported by the protrusion 18 of the friction member 38 is rotated to the gear 39 of the reel base 32.
The reel stand 32 is rotated counterclockwise in the figure, and the tape (not shown) can be run in the forward and reverse directions. Further, the rotational speed and rotation direction of the reel motor 36 change according to the operation of a constant-speed tape running operation member (recording, forward and reverse direction playback) and a tape high-speed running operation member (fast forward, rewind), which are not shown. As such, it is controlled by a reel motor drive circuit which will be described later. When the tape constant speed and high speed running operation members and the tape running stop operation member (not shown) (including pause) are operated, a logic control circuit to be described later is controlled to rotate and rotate the reel motor 36 according to the operation. A stopped state can be obtained.

Next, place the reel stand 32 on the main chassis 31.
．． 33, a reverse switching device 40 as an auto-reverse mechanism that includes a motor drive assist mechanism to be described later is disposed. And forward/reverse switching device 4 with
A substantially disc-shaped drive unit (for example, a main gear cam 41), which will be described later, is rotatably supported at its center of rotation by a rotating shaft 41 embedded in the main chassis 31. 412 is formed.

Here, a dedicated drive source, such as an assist motor 42, is provided on the back side of the main chassis 31, as shown in FIG. A gear 43 is rotatably supported on the rotating shaft of the assist motor 42.
Reduction gears 44, 45, and 46 are sequentially meshed with each other. A gear with a smaller diameter, which is farthest from the gear 43 and is the reduction gear 46, protrudes toward the front surface of the main chassis 3) and meshes with the teeth 412 of the main gear cam 4. Therefore, when the gear 43 is rotationally driven by the assist motor 42, the rotation is caused by the reduction gear 4.
It is transmitted to the main gear cam 41 via a 4°45.46 angle and is rotationally driven. Here, the assist monitor 42 controls the rotation 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 using the logic control circuit, which will be described later. , an assist motor control circuit and an assist motor drive circuit.

Further, on the upper surface of the main gear cam 41, there is a regeneration slider 47 that is slidable in the directions of arrows (E) and (F), the details of which will be described later.
, and a helad slider 48 as a head position control member that is slidable in the direction of arrow (G) @ is sequentially disposed. Therefore, when the main gear cam 4 is rotationally driven as described above, the playback slider 47 is selectively slid in the direction of arrow (6) or C) depending on the direction of rotation, and the tape is played in the forward or reverse direction. At the same time, the head slider 48 is slid in the direction of arrow (G).

At that time, the left and right pinch levers 49 and 50, the details of which will be described 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 moved. It functions by bringing it into contact with a predetermined surface of the tape to create a 41 recording state in the forward or reverse direction.

Here, the upper recording/reproducing head 55 adjusts the azimuth angle accurately in order to enable C1 (recording) in the forward and reverse directions of tape running, that is, forward and backward movements, and adjusts the corresponding track of the tape according to the tape running. This head rotation mechanism 56 will be described later. Here, the above left and right capstan 53°5
4 are the left and right flywheels 57 shown in FIG. 2, respectively.
．． 5Fj, and is inserted into the main chassis 3 from the back side to the front side without rattling and freely rotating. It is something that exists.

Here, as shown in FIG. 2, on the back side of the main chassis 31, the left and right capstans 53 and 54 are
A main motor 59 is provided on the right side in the figure correspondingly, and a sea IJ 6o is supported on the rotation shaft of the main motor 59. A belt 61 is passed between the pulley 60 and the left and right flywheels 57, 58. Therefore, the left and right flywheels 57'
, 5B, the rotation of the main motor 59 is transmitted through the belt 61, so that the main motors 59 and 5B are constantly rotated clockwise and counterclockwise in the figure.

In addition, on the front side of the main chassis 3, the eject part phase 62 is indicated by the arrow (I) in the left side in the figure.
It is supported slidably in the (J) direction.

The ejecting part 62 is formed into a substantially rod-like shape and is disposed from the upper end to the lower end of the main chassis 3. And this eject member 62
The through hole 621 formed at one end is fitted into the sliding part 311 formed in the main chassis 31, and
After the shaft 312 formed in the main chassis 31 is loosely inserted into the through hole 622 formed at the other end, it is supported in a slidable manner by being pressed by the holding ring 313. Further, a spring 63 is provided between the eject member 62d1, a curved locking piece 623 formed approximately in the center thereof, and a retaining shaft 314 formed on the main shaft 731.
As a result, the beginning of the month is moved in the direction of arrow <J).

Here, a locking portion 624 is formed at one end of the ejecting member 62, and when the cassette lid (not shown), which is biased by the locking portion 624 in the direction of the normally open state, is closed, A portion of the cassette lid is locked to maintain the closed state. When an iso-exit operator (not shown) is operated, the eject member 62 is slid via the eject slider 64 in the direction of arrow (I) against the biasing force of the spring 63. Then,
The lock portion 624 of the ejector portion 62 separates from the cassette lid, and the cassette lid is opened.

Further, on the main chassis 31, a cassette detection switch 65 is provided on the upper side in the figure, and a cassette detection switch 65 is provided in the forward and reverse directions.
An erroneous erasure prevention mechanism 68 having 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 4 is supported on the main chassis 31 in mesh with the small diameter gear of the reduction gear 46. The rotary shaft 4 is located on the bottom side of this main gear cam 41.
A curved protruding engagement part 412 is formed at the upper part of the figure in FIG. The pair of return levers 69 and 70 have one end thereof connected to a rotation shaft 691°7, which is implanted in the main chassis 31, respectively.
01, and curved portions 692, 692, 692, 692, 692, 692, 692, 692, 692, 692, 692, 692, 692, 692, 692, 692, 692, 692, 691,
702 is formed.

Further, the pair of return wheels 69'+70 have locking parts 693, 703 corresponding to the buttock parts 692, 702, respectively, with the rotation axis of the main gear cam 4 as a boundary.
are formed continuously.

The locking portions 693, 703 are arranged to sandwich the protruding locking portion 315 formed on the main chassis 3. Furthermore, the above-mentioned return pins 69 and 7'0 are formed with engaging portions 694° and 704 at the other ends, respectively,
A return spring 7 is engaged between the engagement portions 694 and 704.

Here, the operation of the return heart history mechanism configured as described above will be described later.

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

Here, the regeneration slider 47, which has a substantially inverted T shape, is disposed at the upper 1h1 portion of the main gear cam 4 so as to be slidable in the direction of the arrow. A bamboo-shaped through hole 471 is formed in the part, and a cutout part 472 is formed in one end of the through hole 471.The protruding part 413 of the main gear cam 41 is formed in the through hole 471. is inserted, and the tip end 41 of this protrusion 413
5 is opposed to the notch 472 of the through hole 471.

The reproduction slider 47 has a substantially T-shaped through hole 473 formed at one end thereof, and a T-shaped through hole 473 is formed on the side surface of the main chassis 31. The moving part 316 is fitted. . Furthermore, this reproduction slider 47 has a through hole 474 formed at the other end, and the shaft 31 installed in the main chassis 3 is inserted into this through hole 474.
After inserting 7 loosely, it is held down with screw 318 and
An extension part 475 extending to the right in the figure is formed at the central end thereof, and a shaft 319 is implanted in the main chassis 3 through a through hole 476 formed in this extension part 475 (see Fig. 1). is inserted. Therefore, the reproduction slider 47 is supported so as to be slidable in the direction of the arrow I'll (E) (1'').

Further, the reproduction slider 47 has a recess 477 formed in the substantially medium heat section of its lower side, and a notched fitting part 478 is formed in the recess 477. A part of the head rotation mechanism 56, the details of which will be explained later, is engaged with this fitting portion 478.

Unfortunately, the playback slider 47 has bent portions 72 , 7 , 7 at one end and the other end thereof. are formed respectively, and the bent portions 72 and 73 have locking portions 721 and 731, respectively.
is formed. And the locking part 721.731 with
The bent portions 491 and 501 of the left and right pinch levers 49 and 50, which will be described in detail later, are selectively locked in response to the slide of the playback slider 47 in the directions of arrows (E) and (F). be.

Next, on the upper surface of the reproducing slider 47, the RAD slider 48, which has a substantially inverted T shape, is arranged to be slidable in the direction of arrow (G) (II). This head slider 48 (
A concave portion 48) is formed at the tip of the central end, and the shaft 691.7 of the main chassis 31 is formed in this four portion 481.
Since the shaft 482 installed between the two parts 91 is passed through JΦ, it is slidably guided in the directions of arrows (G) and (H) in the figure. When the head slider 48 moves 4111 in the direction of the arrow (G), the bottom of the four parts 48 is connected to the shaft 4.
82.

Further, a through hole 483 is formed at the central end of the Herad slider 48 in correspondence with the rotating shaft 41 of the main gear cam 4, and a through hole 483 is formed at the lower end in the figure of the rotary shaft 483 of the main gear cam 4. The moving hole 484 is formed in a horizontally elongated shape corresponding to the rotational path of the protrusion 414 of the main gear cam 41. The rotation shaft 41 of the main gear cam 41 is inserted into the through hole 483, and the protrusion 414 of the main gear cam 4 is inserted into the rotation hole 484.

Therefore, in the herad slider 48, as the main gear cam 41 rotates, the tip 415 of the protrusion 413 of the main gear cam 41 slides the town slider 47 to a predetermined position 1t, and the subsequent main gear cam 4 By this rotation, the protrusion 414 engages with a portion of the rotation hole 484 and is slid to the predetermined position I6.

Ma/hi, the above Herad slider 48 has a JJi curved bending part stopping part 4s formed at the corners of both ends so as to intersect with the road surface.
, 4 s 6 are provided, 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 have substantially U-shaped sides, and the other end is installed in the main chassis 3. rotation 11'll + 492
, , and ryo2, respectively, so as to be rotatable.

Further, at the other end portions of the left and right pinch levers 49,50, the Eve Y music holding portions 72, 73 of the playback slider 47 are provided.
Protrusions 493 and 503 are respectively formed corresponding to the
The protrusions 493 and 503 are respectively formed with anti-bending portions 491 and 503.

Further, the rotation shafts 492, 502 of the left and right pinch levers 49, 50 are provided with torsion gear rings 74, respectively.
．． 75 is wound and attached, and one end of this torsion spring 74, 75 is attached to the left and right pinch levers 4, respectively.
It is engaged with the back part of 9.50. The other ends of the torsion springs 74 and 75 are engaged with bent locking portions 485 and 486 of the Rad slider 48, respectively. Therefore, the left and right pinch levers are 49.5.
When the head slider 48 is slid in the direction of the arrow (G), the head slider 48 is rotated counterclockwise and clockwise in the figure, respectively. At this time, the left and right pinch levers 49, 50 have their protrusions 49, ? , 503, one of the bent portions 491 and 501 is selectively locked to the other bent engaging portion 485 and 486 as the reproduction slider 47 slides in the arrow (E) and (F) directions, Its rotation is prevented, and the other left and right pinch levers 49.50
are rotated so that the left and right pinch rollers 51 and 52 are brought into contact with the left and right caps 53 and 54.

Here, a locking part 487 is formed at one end of the chassis 48 corresponding to the shaft 317 of the main chassis 31, and a locking part 488 is formed at the other end so that the main chassis 31 slides. It is formed to correspond to the moving part 316. Therefore, the head slider 48 is slid in the direction of arrow (6) until its retaining parts 487, 488 come into contact with the shaft 317 and the sliding part 316 of the main chassis 31. Here, the above Rad slider 48 is
A spring 76 is engaged between the locking piece 489 formed at the other end and the sliding portion 316 of the main chassis 31, so that the spring 76 is biased in the direction of the FO force indicated by the arrow.

Further, the head mounting structure 77 of the head rotation mechanism 56 is attached to the head mounting structure 77 of the head rotation mechanism 56 with screws 77 at approximately the center of the Herad slider 48.
It is attached by 1.

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 this head support 81
An upper recording/reproducing head 55 and an erasing head 82 for a cassette chip recorder are fitted in parallel.

Here, while the head mounting structure 77 is 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 8 from its base.
01 is extended, and the bent end portion of this driven portion 80) is interposed within the fitting portion 478 of the reproduction slider 42. Note that even when the Rad slider 48 is slid in the direction of arrow (G) (6), the driven portion 801 does not separate from the fitting portion 478 and is always interposed within the fitting portion 478. It is something that Therefore, when switching the chi f from the forward direction to the reverse direction and from the reverse direction to the forward direction, the fan-shaped 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 and the head support 81 are rotated in the same direction, and the recording/reproducing head 55 and erasing head 82 are rotated by exactly 180 degrees. Here, a track change (head movement) is performed when switching between forward and reverse tape running. Further, when the layered gear 80 is rotated clockwise in the figure, the gear 79, head base plate 78, and head support 8 are rotated clockwise in the figure, and the recording/reproducing head 55 and erasing head 82 are rotated clockwise in the figure. 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, a pair of screws 772,
773 is screwed on. 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 and 773 of the head mounting structure 77. The screws 7'72, 77
By adjusting the screwing depth of 3.
And the azimuth adjustment of the erasing head 82 can be performed. The recording head 55 and erasing head 82 are also connected to an electrical circuit (not shown) of a recording/reproducing system via a connection line (not shown).

Further, a pair of arrows indicating the tape running direction are displayed on the circumferential side of the head support 81, and a pair of arrows indicating the tape running direction are displayed on the - side of the head support 81. A tape guide portion 83 is formed.

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

Next, the operations of the forward/reverse switching device R40 and the return 41N Ht as an auto-reverse mechanism including the motor drive assist mechanism configured as described above will be described in detail. First, suppose that the main gear cam 4 is rotationally driven in the counterclockwise direction in the drawing by operating the tape constant speed running operating member (forward playback) as described above in the stopped state as shown in FIG. Then, as the main gear cam 41 rotates, as shown in FIG. Point in the @) direction.

As the reproducing slider 47 slides, the recording/reproducing head 55 and erasing head 82 are rotated by the head rotation mechanism 56 in accordance with the tape running direction. At this time, the protrusion 41 of the main gear cam 41
The protrusion 414 of No. 3 is the rotation hole 48 of the Herad slider 4 and 8.
4 is engaged with the right side in the figure. Therefore, with the subsequent rotation of the main gear cam 41, the regeneration slider 47 is moved in the direction of the arrow @) by the distal end 415 of the protrusion 413 coming into sliding contact with the curved portion 471 of the regeneration slider 47, as shown in FIG. However, the helad chassis 48 is urged in the direction of arrow (6) by the protrusion 414 of the protrusion 413, and is slid to a predetermined position. At this time, the left and right pinch levers 49.50, which are engaged with the bending locking portions 485, 486 of the head slider 48 via the torque/springs 74.75, are clockwise and counterclockwise in the figure, respectively. biased in the direction. Therefore, among the left and right pinch levers 49 and 50, the left pinch lever 49 is engaged with the locking portion 72 at one end of the playback slider 47 because the playback slider 47 is located furthest in the arrow direction. and its rotation is prevented. - On the other hand, the right pinch roller 50 is rotated clockwise in the figure without being locked by the locking portion 73 at the other end of the regeneration slider 47, and the right pinch roller 52 is rotated as described above. It is brought into contact with the right cazostan 54. Here, the assist motor 42 that rotationally drives the main gear cam 4 is
The current supply is made very small, 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 activated by rotating the main gear cam 41 in the counterclockwise direction in the figure, as shown in FIG. The part is on the left side in the figure.Reno 4-69
With the rotation of the return lever 69, the return lever 69 is rotated clockwise in the figure about the rotation shaft 691 against the spring force of the return spring 7. At this time, the return lever z4-70 on the right side in the figure is locked by the protruding locking part 315 of the main chassis 31, and is not rotated clockwise in the figure. 9, when the recording/reproducing head 55 and the erasing head 82 have finished rotating, that is, when the head slider 48 has started sliding, the protruding retaining portion 412 of the main gear cam 41 is rotated. The return lever 69 is moved along the curved portion 692, and the return lever 69 is further rotated clockwise in the figure. Therefore, as shown in FIG. 10, as the main gear cam 41 rotates, the protruding retaining portion 41
When one end of the return lever 69 is located at one end of the curved portion 692 of the return lever 69, the rotation of the return lever 69 is stopped. As shown in FIG. 11, when the sliding of the RAD slider 48 is completed, the main gear cam 4
A substantially central portion of the protruding engaging portion 412 is brought into contact with one end portion of the curved portion 692 of the return lever 69 . At this time, the return lever 69 is biased in the direction of arrow (6) by the return spring 51 that is engaged with a portion thereof. -Also, when the end of the tape is reached in the forward playback state described above (the same applies when the end of the tape is started to be operated), an end detection device (not shown) detects this. , it is assumed that the current supply to the assist motor 42 is cut off. Then, as shown in FIG.
The vehicle will be moved backward in the direction of the vehicle.

Here, as the hent 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°5, which are respectively engaged with the bending locking portions 485 and 486 of the head slider 48,
0 is rotated clockwise and counterclockwise in the figure, and the left and right pinch rollers 51.52 are rotated clockwise and counterclockwise, and the left and right pinch rollers 51.52 are rotated clockwise and counterclockwise.
This will be removed from 4.

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 slides into contact with the protruding engagement portion 412 along the curved portion 629 of the return lever 69 on the left side of the figure by the spring force of the return spring 7. This main gear cam 41 is moved while
It is rotated clockwise in the figure to the stopped state shown in FIG. 15. At this time, the regeneration slider 47, which had been urged in the direction of the arrow ``■'' by the tip 415 of the protrusion 413 of the main gear cam 4, is moved in the direction indicated by the arrow ``'' in the figure as the main gear cam 4 rotates. It is slid in the direction (E) and returned to the stopped position.

When the vehicle is returned to the stopped state as described above, a reversal signal is sent to the assist motor 42 if the auto-reverse state is set, 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 4o is operated to establish a regeneration state in the reverse direction.

That is, as shown in FIGS. 16 and 17, as the main gear cam 4 rotates in one direction during one shift, the tip 415 of the protruding portion 413 moves toward the cutout 484 of the regeneration slider 47. This reproduction slider 4 is engaged with the middle left side.
7 in the direction of arrow (F). Here, as the slider 47 slides, the head rotation mechanism 56 described above
Accordingly, the recording/reproducing head 55 is rotated in accordance with the tape running direction. 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 Herad slider 480 in the drawing. Therefore, with the subsequent rotation of the main gear cam 41, the upper ff1L reproducing slider 47 automatically inserts the protruding portion 41 into the music section 471, as shown in FIG.
However, the toss slider 48 is not biased in the direction of arrow (G) by the protrusion 414 of the protrusion 413. and then slid to a predetermined position. At this time, the bending member 1E portion 4135.4 of the head slider 48
Left and right pinch levers 49 and 501 (↓, biased counterclockwise and clockwise in the figure, respectively) are engaged with 86 via torsion springs 74 and 75. 49.50, 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 the arrow (I2), and its rotation is prevented. On the other hand, the left pinch lever 49shij1 and the 4jl raw slider 47
(one end) 111 is rotated counterclockwise in the figure without being locked by the locking portion 72 of the left pinch roller 51 is brought into contact with the left canostan 53 as described above. Here, in the same manner as described above, the current supplied to the assist motor 42 is made very small, the motor is locked, and the tape is reproduced in the reverse direction.

As a result, 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 rotated as the two connected main gear cams 41 rotate in the open direction in the figure. It is engaged with the curved portion 702 of the return lever 70 on the right full in the figure, and the return lever 70 is rotated counterclockwise in the figure about the rotation shaft 701 against the spring force of the return spring 71. . At this time, on the left side of the figure (Ill's Return Gu-69
is locked by the protruding locking portion 315 of the main chassis 31 and cannot be rotated counterclockwise in the figure. With the subsequent rotation of the main gear cam 4), 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 reproducing state in the opposite direction in which the head slider 48 has completed sliding, the protruding retaining portion 412 of the main gear cam 4
The approximately central portion thereof is the curved portion 702 of the return lever 70.
It is in a state where it is engaged with one part of the.

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 terminal connected to the power supply (10B).
and its ground end (GND) is grounded. The logic control circuit 85 has a forward playback input terminal (F, PLAY) and a reverse playback input terminal (P, P
LAY), recording input end (RFC), fast forward input end (F,
F, ), rewind input terminal (to RJ), stop input terminal (ST
O))) and a pause input terminal (PAUSE) are correspondingly connected to respective other ends of switches 86 to 92, each of which has one end connected to ground. Therefore, when the switches 86 to 92 are operated, the logic control circuit 85 outputs input terminals J-' and PLAY corresponding to the switches 86 to 92.

L PLAY, REC, REW, F, F,
, 5TOP and PAUSE are set to the ground potential or the ground potential level (hereinafter referred to as L level). Then, that L
Positive direction playback output end () corresponding to the input end that has become level
i”, ou, t), reverse direction F3 raw output terminal (R, out)
, recording output end (, R, EC.

out), rewind output end (REW, out), fast forward output end (F, F, out) and pause output end (PA
USE, o, ut) are at high level (hereinafter referred to as II level)
Based on this signal, the assist motor 42,
Control the reel motor 36 and main motor 59.
Then, the tape runs and stops.

Here, the assist motor 42 includes transistors Q1+Q2°Q3 . It is connected between the midpoints of Q4. This transistor Q+ lQ2
TQ3 Each transistor Q on the 1st side in the diagram of 1Q4
1 + Q 2 have their bases connected to the positive direction reproduction output terminal (F, out
) and the reverse direction 1 generation output terminal (R,'out). Also, the above transistor Q+ +Q+!
, Q3, and Q4, the bases of the transistors Q3 and Q4 on the upper side of the figure are connected to the resistor R3r, respectively.
The transistors are connected to each other's collectors via R4, and their emitters are each connected to a power source (10B) via a transistor Q5 configured to control the current of the assist motor 42. The base of this transistor Q5 is connected to the collector of the transistor Q6 via a Zener diode D3 connected to the voltage iif, (+B) via a resistor R5.
The base of 6 is connected to the signal output terminal ('r, out) of the logic control circuit 85 through the diode D4 and resistor R6.
It is connected to the.

Further, the fast forward output terminal (F,
F, out), rewind output terminal (R, out),
One input terminal of NAND circuits Nl and N2 is connected to each other, and the other input terminal of NAND circuits N1 and N2 is commonly connected to an 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 Nr + N 2 are connected in common to the input terminals of the NAND circuit N 4 + N 5 that provides a normal rotation or reverse rotation signal to the assist motor 42, and It is connected correspondingly to the input end of circuit N6. Here, the above NAND circuit N41N5
The output end is the connection end 94 of the assist motor drive circuit.
95, and the assist motor 42 is rotated forward or backward depending on the operation of the switch 86 or 87. Sweet 1. The output voltage j of the NAND circuit rq axis is connected to one input terminal of the NAND circuit 11q N7, and the other input terminal of this NAND circuit N7 is connected to the resistor R7.
is connected to the head position detection switch 96 via the head position detection switch 96, and its output terminal is connected to one input terminal of a NAND circuit N8. Furthermore, the NAND circuit N9 whose input terminals are commonly connected to the output terminal of the NAND circuit N6 has a capacitor C1 and a resistor R8 whose one end is connected to the power supply (10B).
is connected to one input end of the NAND circuit NIO via the NAND circuit NIO.

The other input terminal of this NAND circuit NIO is connected cross-connected to the r (L input terminal) of the -F NAND circuit N8, and its output terminal receives a current control signal via a capacitor C2. The output terminal of this NAND circuit N11 is connected to the connection terminal 97 of the assist motor drive circuit.

Next, the reel motor 36 is connected to the assist motor 4.
Transistor Q? connected in a bridge shape in almost the same way as 2?
r Qs r Q9+ DP between the midpoints of Q and +o
HP has been posted. This transistor Q71Qs r
Of Q9 t Qlo, each of the transistors Q7 and Q8 on the lower side of the figure has a diode D at its base.
5. It is connected to the forward reproduction output terminal (F, out) and reverse reproduction output terminal (R, ol:t) of the -H logic circuit 85 via D6 and resistor R9+ RIG. Dimensions,
Of the above transistors Q71Q8+Q91QIO, each transistor Q91QI (+) in the upper part A111 in the figure has a pace of rectangular 1 anti-J1...

The respective collectors are connected to each other via R12, and the emitters thereof are connected to a power source (10B) via a transistor Ql+ configured to control the πt current of the reel motor 36, respectively.

The pace of this l-transistor Qo is connected to the collector of the transistor Q+2 via a Zener diode D7 connected to the power supply (10B) via a resistor R13, and the pace of this transistor Q+2 is connected to the collector of the transistor Q+2 through a resistor R13. D8 and resistor R+4, diode D9 and resistor RI5
are connected to the forward reproduction output terminal (F, out) and reverse reproduction output terminal (1ya.out) of the logic control circuit 85, respectively.

Further, one end of the main motor 59 is grounded,
The other end is connected to the collector of transistor Q+3. This transistor Q+3 has its emitter connected to the power supply (+H), and its base connected to the collector of the transistor Q+2 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 H level.
Assuming that the switch 86 is operated at time Tl as shown in FIG. 21 Ca) to (+), the logic control circuit 85
The signal output terminal (T, out) becomes L level, transistor Q6 is turned off, and the forward direction reproduction output terminal (F, out) becomes L level.
, o+, +t) become H level, and transistor Q1 is turned on.

Then, the assist motor 42 is supplied with a current sufficient for one rotation in a predetermined direction for a predetermined time (at time 7 ['zt), and is driven to rotate in the normal direction. 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 above-mentioned head rotation mechanism 56 is operated, and the recording/reproducing head 55 is brought into contact with the tape surface in accordance with the tape running direction, and the right pinch lever 50 is rotated. Then, the right pinch roller 52 is brought 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, a small predetermined current is supplied to the second assist motor 42 to lock the motor, and the tape is then played back in the forward direction.

On the other hand, the reel motor 36 is connected to the transistors Q7 and Q at time T2 when the reel motor 42 is motor-locked.
12 is turned on and driven.

Therefore, the reel motor 36 is driven at a rotational speed and rotational direction corresponding to the tape running at a fixed square speed, and as described above, the gear 39 meshes with the gear 35 of the reel stand 33, so that the tape runs at a constant speed in the forward direction. It is done.

Here, the main motor 59 is driven by turning on the transistor Q+3 at the time Tl when the forward regeneration switch 86 is operated. As mentioned above, the rotation of the main motor 59 is controlled by the left and right capstans 59
3.54 left and right flywheels 57 and 5 respectively
8.

Next, in the state in which the power switch is operated, the switch 87 is operated at time TI to perform reproduction in the reverse direction (in the case of auto-reverse, the switch 87 is operated by a tape end detection device (not shown)). Then, 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 playback output terminal (R, out) is at )■ level,
Transistor Q2 is turned on. Then, the assist motor 42 is supplied with enough current to drive in a predetermined direction for a predetermined time (until time T2), and is driven in a counter-direction manner. Therefore, as described above, the main gear cam 4 is driven to rotate and operates the forward/reverse switching device to run the tape in the opposite 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 left pinch roller 51 is rotated to bring the left pinch roller 51 into contact with the right capstan 53 via the tape.

At this time, the signal output terminal (T, out) of the logic control circuit 85 is at the H level, and the transistor Q6 is turned on, as in the above-described forward direction reproduction state. Therefore, the assist motor 42 is supplied with a small predetermined current,
The motor is locked and the tape is 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 mower 36 is driven at a rotational speed and rotational direction corresponding to constant speed running in one direction of the tape, and as described above, the gear 39 meshes with the gear 34 of the reel stand 32, and the tape is rotated in the opposite direction. Directional constant speed driving is performed.

Here, the main motor 59 is driven by turning on the transistor Q13 at the time Tl when the switch 87 is fully operated, as in the above-described forward direction regeneration.

Furthermore, when the switch 89 is operated to perform fast-forward tape running, the fast-forward output terminal (l) of the logic control circuit 85 is activated.
-6F, out) The reel motor 36 is driven by a fast-forward circuit (not shown) connected to the fast-forwarding circuit (not shown) at a rotational speed and direction corresponding to the fast-forwarding state of the tape, thereby ensuring stable fast-forwarding of the tape. It is.

Here, in order to run the rewind tape, switch 90 is pressed.
, the rewind circuit (not shown) connected to the rewind output terminal (REW, out, ) of the logic control circuit 85 causes the reel motor 36 to rotate at a rotation speed and rotation corresponding to the tape rewind state. The tape is driven in the same direction, and stable tape rewinding is achieved.

Also, in order to perform fast-forward playback (cue), switch 8
Suppose that 6 and 89 are operated in a composite manner. Then, the selection switch 93 is turned on, and the output terminal of the NAND circuit N3 becomes level (), and the fast-forward output terminal (F, F, out) of the logic control circuit 85 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, so that sufficient current is supplied to the assist motor 42 to drive it in a predetermined direction. and is driven in forward rotation. Therefore, the main gear cam 4 is rotationally driven to operate the forward/reverse switching device and function to run the tape in the forward direction.
is rotated in accordance with the tape running direction.

Thereafter, as described above, the head slider 48 is slid and the recording/reproducing head 55 lightly touches the tape surface, and the head position detection switch 96 is turned off before the stone pinch roller 52 comes into contact with the right capstan 54. Ru. Then, NAND circuit N6.

N7 r N[1p N9 r N10 causes the output terminal of the NAND circuit N11 to go to H level, turning on the transistor Q6 of the assist motor drive circuit. Therefore, a minute current is supplied to the assist motor 42, the motor is locked, and fast-forward playback (key, key, etc.) is performed.
~--) is performed.

Here, it is assumed that the switches 87 and 90 are operated in combination to perform rewind playback (review). Then, the cutoff 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. Therefore, Nand circuit N
5 becomes H level, the transistor Q2 of the assist motor drive circuit is turned on, and the transistor Q6 is turned off as described above, so that the assist motor 42 receives a current sufficient to drive it in a predetermined direction. Inverted and driven.

Therefore, the main gear cam 41 is rotationally driven to operate the forward/reverse switching device, functioning to run the tape in the forward direction, and rotating 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 the head position detection switch 96 is turned off before the left pinch roller 5 comes into contact with the left capstan 53. .

Then, NAND circuit N6 + N7 *Nil
+N9*Nll+ causes the output terminal of the NAND circuit Nll to be at 1 level, and the 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 rewinding/playback is performed.

Next, an embodiment of the present invention, which is a further development of the basic example described above, will be described.

That is, the head position detection switch 96 described above is
- This is provided to detect the head position at the time of review and to perform cue and review (cue) operations correctly at the Fr fixed cheese position.

However, there is a problem in that it is difficult to actually detect the head position, that is, to set and adjust the operating position of the head position detection switch 96 at a correct position.

Therefore, the present invention is characterized in that the operating position of the head position detection switch 96 is set to nl:1, and the head position detection switch 96 is configured to be set at an appropriate position reliably.

That is, as shown in FIG. 22, an engaging portion 48a is provided projecting above the head slider 4B, and
By engaging and disengaging Rh from the switch operating portion 4A21 when the head slider 48 slides in the arrow (a), ←) direction, the head position detection switch 96 is moved to the head slider 48.
It is designed so that it can be turned on and off at a predetermined position.

At this time, the switch actuating member 21 is implanted in the main chassis 31 into the long hole 21a shaped like a dumpling, which has three locking points (a), (b), and (c) fixed in its middle part. Since the guide member 23 is elastically engaged with the guide member 23, it can freely rotate in the direction of the arrow (C) and (C) about the retaining part as a fulcrum. A biasing force is applied in the direction of the arrow ← by the engaged spring 24.

Further, the switch actuating member 21 has an engaging portion 21b protruding from the base end thereof located on the movement path of the retaining portion 48a of the head slider 48, and a rectangular long hole 21c formed at the distal end portion. An operating shaft 96a of the head position detection switch 96 is inserted and engaged therein.

In the above configuration, the elastic engagement portion between the bulb-shaped elongated hole 21a of the switch actuating member 21 and the guide member 23 is appropriately positioned between the three locking points (a), (b), and (e). Moving the head position detection switch 22 involves changing the operating position of the head position detection switch 22 without changing the position. Normally, after assembling -C, the actual head position 1fi is detected. The proper movement position is determined during Nodame's training. ! , sea urchin other i thread anchoring point (a) or (c)
All you have to do is make sure that they are moved between each other.

Figure 23 (a), (+1) is set at the locking point (b) of medium heat [before switch operation and switch operation 11 when ...]
, indicates a -〇-shaped raccoon dog. Figure 24 (a), (b
) and FIGS. 25(b) and 25(a) and 25(b) respectively show the states of the combs set at other locking points (a), t, or (C) before and during switch operation.

In other words, when the switch is operated, the Herad slider 48 is
- The switch actuating member 21 is moved upwardly by the spring 2
By rotating the head position r in the direction of arrow (c) against the biasing force of 4, the operating shaft of the detection switch 96 is pushed down and its contact is switched from on to off.

Before the switch is operated, the switch actuating member 21 is moved by the spring 2 by the downward movement of the helad slider 48.
By rotating the head position detection switch 96 in the direction of the arrow with the biasing force of 4, the operating shaft of the head position detection switch 96 is pulled up and its contact is switched from OFF to ON.

That is, as described above, the switch actuating member 21 is simply
By simply changing the locking point of the head position detection switch 96, the operating position of the head position detection switch 96 can be easily and reliably adjusted to an appropriate position.

Note that the head position detection switch 96 is actually the second
As shown in FIG. 3(a), the first contact 96A is turned from off to on when the switch is operated, and the second contact 96B is turned from on to off when the switch is operated.
and these No. 1.1. - and second contact 96A
, 96 B's operation timing is the second contact point, .
! ? 6B turns from on to off a little earlier than the timing at which the first contact 96A changes from off to on, and also turns off from off a little later than the timing at which the first contact 96 turns from on to off. It is assumed that the power is turned on again.

At some point, even if the head position can be detected precisely and correctly as described above, the key and the rev 5. −(
When the head position detection switch 96 is operated, the key 5. -, there is a problem in forcing a transition to a review (cue) operation. In other words, in practice, the key, review (
The head position (jar) is operated at a position that is slightly regressed from the head position during normal playback. This is because it is difficult to properly control the amount of regression of the head position if the head position is shifted to a cueing operation.

Next, we will explain for reference how to control the amount of regression of the head position during such cue and review operations to ensure that the head position is at an appropriate position even if it is simplified.

That is, FIG. 26 shows the assist motor drive circuit shown in FIG. 19. In this case, the head position detection switch 96 is connected between the resistor R5 in FIG. A second contact 96B is inserted;
The collector emitter of a transistor Q20 is correspondingly connected to both ends of this second contact 96B, and the transistor Q2 is connected to the base of this transistor Q20 via a resistor R20.
19, the emitter of this transistor Q21 is grounded, and the base is connected to a control terminal CT, which will be described later, via a resistor R21. They have essentially the same configuration.

In the above configuration, a case will be described in which the stop state is first changed to a forward playback state, and then the playback state is returned to the stop state.

That is, in this case, if the switch 86 is operated at time T11 shown in FIG. 27, a predetermined current in the positive direction will be supplied to the assist motor 42 as shown in FIG. As described above, the slider 48 is moved to the Nj raw (1) LAY) position at time TI2, as shown in FIG. 4(e).

Then, at this point, the above-mentioned head position (M') and the second contact 96T3 of the detection switch 96 are set to the same [';!1 (b)
As shown in the figure, the state changes from off to on, but the first contact 9
6A changes from the on state to the off state a little more quickly than this, as shown in FIG. 6(c).

In this case, the assist motor 4 is activated by +iIII operation of the first contact 96A of the head position detection switch 96.
2 is placed in the locked state, that is, in the playback state.

Thereafter, when the switch 9 is operated at time T13, the supply of the assist motor 42 is cut off to a halt state, and the head slider 48 also returns to the halt position. Further, as a result, the second contact 96B of the head position detection map 96 changes from on to off at the timing shown, and the first contact 96A also returns from off to on with a slight delay.

Note that FIG. 27(d) shows the switches related to the operation of the head rotation mechanism 56! This indicates which direction the playback is currently in.

Further, when changing from a stopped state to a reproducing state in the reverse direction and then returning to a stopped state, the operation is similar to that shown in FIG. 27 as shown in FIG. 28.

Next, a description will be given of a case where a key, -, levy (cue cue) operation is performed, using a cue as an example.

That is, in this case, it is assumed that the assist motor 42 has been locked in advance for the forward regeneration state as shown in FIG.
Suppose you operate

However, in this case, transistor Q6 in FIG. 26 is turned off, as in the case of FIG. 19 described above.
Since the control signal from the control circuit (not shown) (corresponding to 85 in FIG. 19) supplied to the control terminal CT is inverted from the previous H level to the L level, the resistor R5 becomes equivalent to an open state. The transistor Q5 is also turned off, and as a result, the assist motor 42 is temporarily stopped at this point.

Then, the head slider 48 moves from position 4F: position 1h (from pJ to position 1h) as shown in 291RJ (e).
However, during step 5 of this process, the second contact 96■3 of the head position detection switch 96 is turned off or in a C-type state as shown in FIG. - and the transistor Q5 is turned off.

As a result of this V, the assist motor 42 receives a + Q: D [constant th, flow in the positive direction], so the head slider 48 is regenerated again. is moved in the i direction.

Then, the second contact 96 of the head position detection switch 96
Since B is turned from on to off, transistor Q
When 5 is turned off, the assist motor 42 is stopped again at 7, and as a result, the head slider 48 is returned to the Ilj and bamboo stop positions in the direction of 1 squid.

As a result, the second contact 96B of the head position grilling switch 96 is changed from off to on again, so the Tran Zosta Q5 is turned on, the assist motor 42 is driven, and the head slider 48 is regenerated again. moved in the position direction.

Then, the contact 96B of 8i52 of the head motor device detection switch 96 changes from on to off again, so the transistor Q5 turns off, the assist motor 42 comes to a halt, and the head slider 48 returns to the M and stop position direction. It becomes like this.

How many times should the toss slider 48 advance and retreat like this?
In the illustrated case, the head slider 48 is converged to an appropriate position for the cue state while repeating the process (two and a half times).
ii However, if the control signal for the control terminal CT is returned from the L level to the I level at this timing, that is, at time T22, the transistor Q5 returns to the on state, and the transistor Q6 returns to the above-mentioned state. Logic control circuit 85
The head slider 48 is turned on by the H level signal from the signal output terminal ('I', out) and locked, and the head slider 48 moves to the corresponding 1st position 'IL'.
(see 5 < Figure 29 e) fil! It is something that will be ill.

That is, by performing the rocking motion of moving the head slider 48 forward and backward a predetermined number of times during cue and review operations as described above, it is possible to easily adjust the amount of retraction of the go and do positions, and to make it more practical. It can be controlled so that f is at an appropriate level.

It should be noted that this invention is not limited to the above-mentioned and illustrated features 1, but it is possible to modify and adapt the gods without departing from the gist of this invention. Nor.

〔Effect of the invention〕

Therefore, as described in detail above, according to the present invention, the present invention has been improved so that the detection of position 1;・It becomes possible to provide a tape recorder device with excellent quality.

[Brief explanation of the drawing]

1 to 21 are configuration explanatory diagrams and operation explanatory diagrams showing a basic example of a tape recorder device according to the present invention, and a wiring diagram and timing chart of an electric circuit used therein, and FIG. 22 is an embodiment of the present invention. A configuration explanatory diagram of the main parts showing the
23 to 25 are explanatory diagrams of the operation of FIG. 22,
29 to 29 are configuration explanatory diagrams and timing charts for use in cues and levies as specific examples of FIGS. 23 to 25. 3... Main chassis, '32.33... 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° 45.46...Reduction gear, 47...Reproduction slider,
48...Head slider, 49...Left pinch lever, □50...Right pinch lever, 5...Left pinch roller, 52...Right pinch roller, 53...Left capstan, 54 ...Right cazo stan, 55...Recording/reproduction head, 56...Head rotation mechanism, 57...Left flywheel, 58...Right flywheel, 59...Main motor, 60...Nori , 6...belt, 6
2... Eject member, 63... Spring, 64...
Eject slider, 65...Cassette e-out switch, 66°67...Erroneous erasure prevention switch, 68...Erroneous erasure prevention mechanism, 69, 70...Return lever, 71...
・Return spring, 74.75...Torsion spring,
76... Spring, 77... Head mounting structure, 78...
・Head base plate, 79...gear, 80...square gear,
8... Head support, 82... Erasing head, 83
... Tape guide section, 84 ... Torsion spring, 85 ... Logic control circuit, 116, 87.88
．． 89°9θ, 91.92...switch, 93...
Selection switch, 94.95... Connection end, 96... Position detection switch, 97... Connection end, 96A... First
Contact, 96B...Second contact N Q20 r Q2
1...Transistor, R20e R21...Resistor,
CT...control terminal, 48IL...engaging part,
21... Switch actuation member, 21a... Long hole, 23
...Guiding member, 24...Sring, 96a...
Operation axis.

Claims (1)

[Claims] A motor drive assist mechanism that moves the head position control unit-moon from the stop position to the operating position in the drive state of the assist motor; a switch actuating member that is engaged with the operating shaft and has a plurality of locking points in the middle and is rotatably and elastically engaged with the guide member, the locking points of the switch actuating portion being The tape recorder device is characterized in that the head position detection switch is actuated at a predetermined position taken by the head position control member, and the assist motor can be controlled to a predetermined state.