JPH0477978B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a magnetic recording/reproducing apparatus using a cassette half containing a magnetic tape. Note that the "magnetic recording/reproducing device" in the present invention
This applies not only to devices capable of recording and reproducing, but also to devices capable of only reproducing.

BACKGROUND TECHNOLOGY A conventional general magnetic recording/reproducing device slidably supports a head chassis to which a magnetic head is attached, and during recording or reproduction, the head chassis is advanced in a direction approaching a cassette half to move the magnetic head. When touching the magnetic tape in the cassette half, and when fast forwarding or fast reversing the magnetic tape,
The magnetic head is moved back to a position where it slightly touches the magnetic tape, making it possible to locate the beginning of a song when selecting a song. In such a magnetic recording/reproducing apparatus, it is necessary to improve the positional accuracy of the magnetic head during recording or reproduction, or during fast forwarding or fast reversing.

In the conventional magnetic recording/reproducing apparatus of this type, movement by an electromagnet or the like is transmitted to a plurality of arms, levers, etc., and the head chassis is positioned by these arms, levers, etc.

Problems to be Solved by the Invention However, in the conventional example described above, the positioning of the headshaft is performed by transmitting movement by an electromagnet or the like to an arm, a lever, etc., and thus the positioning accuracy of the headshaft is poor.

The present invention solves the above-mentioned conventional problems and provides a magnetic recording/reproducing device that can improve the positioning accuracy of a headshaft and control a fast-forward direction determining means using a rotary lever for positioning the headshaft. It is something to do.

Means for Solving the Problems In order to achieve the above object, the present invention includes a pair of rotary levers supported on a base plate so that the legs can be opened and closed, an adsorbent provided on each rotary lever, and an adsorbent provided on each rotary lever. The device is equipped with a pair of electromagnets that attract each rotary lever to hold each rotary lever in a closed state, and a fast-forward direction determining means that controls the fast-forward direction in conjunction with the rotation of the rotary lever.

Effect The present invention has the above-mentioned configuration, and the engaging member provided on the head chassis is moved against the biasing force of the elastic body by a pair of rotary levers held in a closed leg state, or by a pair of rotating levers held in a closed leg state. The rotating lever and the edge of the hole formed in the base plate lock the head chassis in the fast-forwarding position, and the fast-forwarding direction determining means is controlled according to the closed or open state of the pair of rotating levers to move the tape. This determines the fast forward direction.

Embodiment In FIGS. 1 to 8, 1 is a substrate. First, the mechanism of the surface S1 of this substrate 1 is shown in FIG.
The explanation will be centered on FIG. 4.

The rear edge of the substrate 1 is bent at a right angle to form a rear plate 2. Reference numeral 3 denotes a side plate fixed to the base plate 1. Guide grooves 4 and 5 are formed in this side plate 3, and a notch recess (not shown) is formed approximately in the center of the lower part of the side plate 3. ing. Reference numeral 7 denotes an auxiliary side plate attached to one side of the side plate 3 at a predetermined interval, and a link 8 is rotatably supported on the auxiliary side plate 7 by a shaft 9. A pin 10 is implanted on one side of the link 8. This pin 10 is connected to a notched recess (not shown) in the side plate 3.
to go into. A long pin 11 is implanted on the other side of the link 8. Reference numeral 6 denotes a notch recess formed in the lower part of the auxiliary side plate 7, into which the long pin 11 of the link 8 is inserted. Reference numeral 12 denotes an L-shaped side plate fixed to the substrate 1, and a cam groove 13 is formed in the upper surface of the side plate 12. 14 is a printed circuit board fixed to the upper surface of the side plate 12, and this printed circuit board 14 has a cassette insertion detection switch 15 and an ejection detection switch 1.
6 is installed. A switch bar 17 is rotatably supported on the lower surface of the side plate 12. A cassette detection piece 18 pressed by the cassette half is integrally formed at one end of the switch lever 17, and a cassette detection piece 18 is integrally formed at the other end. A drive pin 19 for driving the drive piece 15a of the cassette insertion detection switch 15 is integrally formed. A spring 20 biases the switch lever 17 in a counterclockwise direction (counterclockwise in FIG. 4). 21 is an L-shaped carriage that slides back and forth (in the directions of arrows Y and Y') guided by the side plates 3 and 12; a rack 22 is formed on this carriage 21; A cam groove 23 into which the pin 10 is inserted is formed. 24 is a pin attached to the carriage 21. Reference numeral 25 denotes a cassette engaging pawl rotatably supported at one end of the carriage 21, and the cassette engaging pawl 25 has a pin 2 inserted into the cam groove 13 of the side plate 12.
6 has been planted. Reference numeral 27 denotes a spring that biases the cassette engaging claw 25 clockwise (clockwise in FIG. 4). Due to the biasing force of the spring 27, the pin 26 of the cassette engaging claw 25 is pushed into the cam groove 13. It comes into contact with the hole edge on the side plate 3 side. Pins 28 and 29 are implanted into the carriage 21 to be inserted into the guide grooves 4 and 5 of the side plate 3.

30, 31 are U-shaped lifter plates, 32a, 32
b are pins formed at both ends of the lifter plate 31;
3a and 33b are long holes formed at both ends of the other lifter plate 30, and the pins 33a and 32b are inserted into the long holes 33a and 33b. 30
a, 30b are pins implanted at both ends of the lifter plate 30, these pins 30a, 30b are inserted into holes in the substrate 1, and the lifter plate 30 is attached to these pins 30a, 30b.
It is rotatably supported by the substrate 1 using 30b as a fulcrum. Similarly, pins 31a and 31b implanted at both ends of the lifter plate 31 are inserted into holes in the substrate 1, and the lifter plate 31 is rotatably supported by the substrate 1. 34
is a spring whose one end is locked to the lifter plate 31 and the other end is locked to the rear plate 2 of the board 1;
This spring 34 urges the lifter plate 31 clockwise (clockwise in FIG. 4).
As described above, the lifter plates 30 and 31 have pins 32a,
32b and the elongated holes 33a and 33b, when the lifter plate 31 is biased clockwise by the spring 34, the lifter plate 30 is biased counterclockwise. The long pin 11 of the link 8 rotatably supported by the auxiliary side plate 7 contacts the lower surface of the lifter plate 30 and restricts the counterclockwise rotation of the lifter plate 30.

35 is a cassette holding plate rotatably supported by the rear plate 2 of the board 1;
A cam portion 36 is integrally formed at one end of the cam portion 5 . Reference numeral 35a denotes a presser piece having spring properties attached to the cassette presser plate 35. A spring 37 biases the cassette holding plate 35 in one direction. When the carriage 21 moves backward (Y' direction),
A pin 24 implanted in the carriage 21 engages with a cam portion 36 of the cassette holding plate 35, and rotates the cassette holding plate 35 in the direction of arrow R against the urging force of a spring 37. 38 is a switch protection plate for protecting the cassette insertion detection switch 15 and ejection detection switch 16; 39 is a side plate 1;
This is a cassette guide member attached to 2.

With the above configuration, the cassette transport mechanism automatically transports the inserted cassette half to the playback (or recording) position, or automatically transports the cassette half in the playback (or recording) position to the cassette ejection position. is configured.

Next, the drive mechanism for driving the cassette transfer mechanism will be explained. This drive mechanism mainly uses the board 1
It is configured on the back side S2 of. Figure 5, Figure 6, Figure 7
8, reference numeral 40 is a motor that is capable of forward and reverse rotation and is attached to the surface S1 of the substrate 1. Reference numeral 41 is a rotating shaft of the motor 40.
It penetrates through the hole and protrudes to the back surface S2 side of the substrate 1. 42 is a first gear press-fitted into the rotating shaft 41, and C-shaped grooves 42a and 42 are formed on both sides of the first gear 42, respectively, as shown in FIGS. 9A and 9B.
b is formed. Reference numeral 43 denotes a second gear rotatably supported by the rotating shaft 41, and as shown in FIG. It is formed. 44 is a semi-cylindrical pawl, and this pawl 44 is inserted into a groove 42b on the lower surface of the first gear 42 and an annular groove 43a of the second gear 43. 1st above
The gear 42, the second gear 43, and the pawl 44 constitute a one-way clutch mechanism. For this reason, motor 4
When the rotating shaft 41 of the motor 0 rotates clockwise (clockwise CW in FIG. 5), the rotational driving force of the motor 40 is transmitted from the rotating shaft 41 to the first gear 42 to the pawl 44 to the second gear 43. , the second gear 43 rotates clockwise. However, even if the rotating shaft 41 of the motor 40 rotates counterclockwise (CCW),
The rotational driving force of the first gear 42 is not transmitted to the second gear 43 via the pawl 44, and the second gear 43 does not rotate. A pulley 45 is rotatably supported by the rotating shaft 41, and as shown in FIG. 10B, an annular groove 45a having a stepped portion 45b on the outer periphery is formed on the lower surface of the pulley 45. 46 is a semi-cylindrical pawl, and this pawl 46 is inserted into a groove 42a on the upper surface of the first gear 42 and an annular groove 45a of the pulley 45. The first gear 42 and pulley 45
and pawl 46 constitute a one-way clutch mechanism.
Therefore, when the rotating shaft 41 of the motor 40 rotates counterclockwise (counterclockwise CCW in FIG. 5), the rotational driving force of the motor 40 is transmitted from the rotating shaft 41 to the first gear 42 to the pawl 46 to the pulley 45. transmitted to
Pulley 45 rotates counterclockwise (CCW).
However, even if the motor 40 rotates clockwise (CW), the rotational driving force of the motor 40 is
5 is not transmitted.

11A and 11B show a C-shaped groove 42a on the upper surface of the first gear 42 and an annular groove 45 on the lower surface of the pulley 45.
When the first gear 42 rotates counterclockwise (CCW) as shown in FIG. 11A, one end of the pawl 46 is in the annular groove 45a.
The other end of the claw 46 contacts one end of the C-shaped groove 42. Therefore, the counterclockwise rotational driving force of the first gear 42 is transmitted to the pulley 45 via the pawl 46. On the other hand, FIG. 11B shows a case where the first gear 42 rotates clockwise (CW), and one end of the pawl 46 comes into contact with one end of the groove 42, while the other end of the pawl 46 is attached to the pulley 45. It does not come into contact with the step portion 45b of the annular groove 45a, so the rotational driving force of the first gear 42 is not transmitted to the pulley 45. A fixed shaft 47 is fixed to the substrate 1, and a mode clutch lever 48 is rotatably supported on the fixed shaft 47. A third gear 49 is rotatably supported by the mode clutch lever 48, and the third gear 49 is integrally formed with a large diameter gear portion 49L and a small diameter gear portion 49S. Reference numeral 50 denotes a fourth gear in which a large diameter gear part 50L and a small diameter gear part 50S, which are always in mesh with the small diameter gear part 49S of the third gear 49, are integrally formed. The fixed shaft 47
is rotatably supported. 51 is a fifth gear rotatably supported by the substrate 1;
The gear 51 is the small diameter gear part 50 of the fourth gear 50.
A large-diameter gear portion 51L and a small-diameter gear portion 51S, which are always in mesh with S, are integrally formed. In FIG. 5, 52 is a sixth gear rotatably supported by the base plate 1, and this sixth gear 52 is a large-diameter gear portion that constantly meshes with the small-diameter gear portion 51S of the fifth gear 51. 52L and rack 2 of the above carriage 21
2 and a small-diameter gear portion 52S that constantly meshes with the gear portion 52S.

In FIG. 4, reference numeral 53 denotes a plunger solenoid fixed to the surface S1 of the substrate 1, and a pin 55 is press-fitted into the tip of a movable iron core 54 of the plunger solenoid 53. This pin 55 passes through a hole in the substrate 1 and projects to the back surface S2. 56
is a spring that biases the movable iron core 54. The pin 55 is inserted into the elongated hole 57 of the mode clutch lever 48. When no current is supplied to the plunger solenoid 53, the movable iron core 54 is urged in a direction to protrude from the plunger solenoid 53 by the urging force of the spring 56. Therefore, the mode clutch lever 48 is biased clockwise (clockwise in FIGS. 5 and 6) via the pin 55, and the large diameter gear portion 49L of the third gear 49 and the first gear 42 is a non-meshing state. On the other hand, when current is supplied to the plunger solenoid 53, the movable iron core 54 of the plunger solenoid 53 is attracted. As a result, the mode clutch lever 48 that engages with the pin 55 of the movable iron core 54 of the plunger solenoid 53 is rotated counterclockwise (counterclockwise in FIGS. 5 and 6).
A large diameter gear portion 49L of the third gear 49 meshes with the first gear 42. Therefore, the rotational driving force of the motor 40 is as follows: first gear 42 → third gear 49 → fourth gear 50 → fifth gear 51 → sixth gear 52
→Transmitted via the rack 22 to the carriage 21
moves backward (Y' direction) or forward (Y direction). That is, when the motor 40 rotates clockwise, the carriage 21 moves backward (in the Y' direction).
Conversely, when the motor 40 rotates counterclockwise, the carriage 21 moves forward (in the Y direction).

Next, the operation of the cassette transfer mechanism and cassette transfer drive mechanism will be explained.

First, when the cassette half is not inserted into the cassette insertion part 58, the carriage 21 is located forward (in the Y direction), and the lifter plates 30 and 31 are each separated from the board 1 (the lifter plate 30, 31, the leg angle is small)
It is in.

Here, insert the cassette half into the cassette insertion section 58.
When the cassette half is inserted, the cassette detection piece 18 of the switch lever 17 is pushed, and the switch lever 17 is rotated. Therefore, the drive pin 19 of the switch lever 17 pushes the drive piece 15a of the cassette insertion detection switch 15, the cassette insertion detection switch 15 is opened (ON), current is supplied to the plunger solenoid 53, and the movable iron core 54 is turned on. is attracted, the mode clutch lever 48 rotates counterclockwise (counterclockwise in FIGS. 5 and 6), and the third gear 49 engages the first gear 42.
mesh with. When the cassette insertion detection switch 15 is closed (ON) and a predetermined period of time (for example, 100 mS) has elapsed, current is supplied to the motor 40 under the control of the control circuit, and the motor 40 is rotated clockwise (clockwise in FIGS. 5 and 6). direction). The rotational driving force of the motor 40 is transmitted to the rack 22 via the first gear 42, the third gear 49, the fourth gear 50, the fifth gear 51, and the sixth gear 52, and the inserted cassette is Carriage 2 with the half stationary
1 moves in the backward Y' direction). Carriage 21
When the cartridge 2 moves further backward, the cassette engaging claw 25 of the cartridge 21 engages with the hole edge of the tape exposed surface of the cassette half, and the cassette half
1, it is transferred backward (in the Y' direction). When the carriage 21 is moved further rearward, the pin 2 of the cassette engaging pawl 25 supported by the carriage 21
6 reaches the bent portion 13a of the cam groove 13 of the side plate 12, the cassette engaging pawl 25 rotates and releases the engagement of the cassette half, and the pin 24 of the carriage 21 engages the cam of the cassette holding plate 35. 36 and rotates the cassette presser plate 35, the presser piece 35
Push the cassette half downward (Z direction) with a. Also, the direction in which the lifter plates 30, 31 contact the substrate 1 in synchronization with the rotation of the cassette holding plate 35 (the direction in which the leg opening angle of the lifter plates 30, 31 increases)
Rotate to. That is, a bent portion 23a that bends upward is formed at one end of the cam groove 23 of the carriage 21, and when the carriage 21 moves rearward (in the Y' direction), the pin 10 of the link 8 bends in the cam groove 23. When reaching the curved portion 23a, the link 8 rotates and the long pin 11 of the link 8 moves toward the substrate 1. Therefore, the lifter plates 30 and 31, which were restricted by the long pins 11, are rotated in the direction of approaching the board 1 (in the direction of increasing the leg opening angle of the lifter plates 30 and 31) by the urging force of the spring 34. move.

In this way, as the carriage 21 moves rearward, the cassette half is transferred horizontally, and as the carriage 21 moves further, the engagement of the cassette engaging claw 25 with the cassette half is released, and the cassette half is moved horizontally. As the presser plate 35 rotates, the lifter plates 30 and 31 also rotate, so the cassette that has been transferred backwards descends to the playback position (or recording position).
is set to

Meanwhile, the cassette is at the playback (or recording) position.
When the motor 40 rotates counterclockwise (counterclockwise in FIGS. 5 and 6) in the state where the cassette half is set to Than
After being transferred in the Z' direction, it is transferred in the Y direction and transferred to the cassette insertion section 58, and when the ejection detection switch 16 is closed by the carriage 21,
Rotation of motor 40 stops.

Next, the magnetic tape running mode switching mechanism will be explained.

In FIGS. 4 to 8, 60 is a fixed shaft fixed to the back surface S2 of the substrate 1, and 61 is a large-diameter gear portion 6.
1L and a small-diameter gear portion 61S are integrally formed as a seventh gear, and this seventh gear 61 is rotatably supported by a fixed shaft 60. Reference numeral 62 denotes a clutch lever whose one end is rotatably supported by the fixed shaft 60, and a large-diameter gear portion 63L and a small-diameter gear portion 63S are integrally formed on the shaft provided on the clutch lever 62. The eighth gear 63 is rotatably supported. The small diameter gear portion 63S of the eighth gear 63 is always meshed with the large diameter gear portion 61L of the seventh gear 61. 64 is a long hole formed at the free end of the clutch lever 62, and the mode clutch lever 48 is inserted into this long hole 64.
A pin 65 implanted in the free end of is inserted.
Mode clutch lever 48, clutch lever 62, plunger 53, pin 55, third
A coupling switching mechanism is constituted by the gear 49, the eighth gear 63, etc., and the third gear 49 and the first gear 42 are engaged or disengaged depending on the operation of the plunger solenoid 53, and the eighth gear 63 and the second gear 43 are controlled to disengage or engage.
66 is a fixed shaft 67 fixed to the back surface S2 of the board 1
This ninth gear 66 has a large diameter gear part 66L and a small diameter gear part 66S that are always meshed with the small diameter gear part 61S of the seventh gear 61. are integrally formed.
68 is a tenth gear rotatably supported by the fixed shaft 69 of the substrate 1, and this tenth gear 68 is always meshed with the small diameter gear portion 66S of the ninth gear 66. In FIGS. 5, 7, and 8, 70 has one end connected to a pin 71 at an eccentric position of the tenth gear 68
The lever 72 connected via is a sliding lever slidably supported on the back surface S2 of the substrate 1,
One end of this sliding lever 72 is formed with a bent portion 72a bent into a crank shape.
A pin 73 is implanted in 2a. This pin 7
3 is inserted into a hole formed at the other end of the lever 70, and the lever 70 and the sliding lever 72 are connected via a pin 73. The sliding lever 72 is driven via the lever 70 and slides when the tenth gear 68 rotates. 74 is a pin implanted in the sliding lever 72, 75a and 75b are driving pieces integrally formed on one side of the sliding lever 72, and these driving pieces 75a and 75b are It is bent almost at a right angle. 76 is a sliding lever 72
It is a pin planted at the other end of the Reference numeral 77 denotes a rotary lever rotatably supported by a fixed shaft 78 fixed to the back surface S2 of the substrate 1;
An elongated hole 79 into which the pin 76 of the sliding lever 72 is inserted is formed at one end. The rotating lever 77 rotates counterclockwise or clockwise when the sliding lever 72 slides in the Y' direction or the Y direction. Reference numeral 80 denotes a black position detection label attached to the rotating lever 77, and a light reflecting surface 80a is formed in the center of the label 80. A lever 81 has one end connected to one end of the rotary lever 77 via a pin 82, and this lever 81 slides in accordance with the rotation of the rotary lever 77. 83 is a pin implanted at the free end of the lever 81.

In Figures 5, 7, and 8, 84, 85
are fixed shafts 86, 8 fixed to the back surface S2 of the substrate 1.
7, and long holes 88, 8 are provided at one ends of the links 84, 85, respectively.
9 is formed. A drive pin 143 attached to the head chassis 121, which will be described later, is inserted into the long holes 88, 89. The link 84 is connected to the slide lever 72 when the slide lever 72 slides in the left direction (Y direction in FIGS. 5, 7, and 8).
The link 85 is driven clockwise by the pin 74 of No. 2, and the sliding lever 72 of the link 85 is driven to the right (Y' direction).
When sliding, it is driven counterclockwise by the pin 73 of the sliding lever 72.

In FIGS. 4 and 7, 90 and 91 are shafts 92
This is a rotary lever rotatably supported on the surface S1 of the substrate 1, and at one end of the rotary levers 90, 91, adsorbents 93, 94, which are attracted by electromagnets to be described later, are rotatably attached. Supported. Reference numeral 95 denotes a spring supported by the shaft 92. The biasing force of the spring 95 biases the rotating lever 90 clockwise (clockwise in FIG. 4), and the spring 95 biases the rotating lever 91 counterclockwise. direction (counterclockwise in FIG. 4). 9
6 and 97 are inclined surfaces formed on the rotating levers 90 and 91. A sliding lever 98 is slidably supported on the surface S1 of the substrate 1, and the tip of the rotating lever 90 is engaged with a recessed portion of the sliding lever 98. Therefore, the sliding lever 98 slides in accordance with the rotation of the rotating lever 90. In Figure 4,
Reference numerals 100 and 101 designate rotating arms rotatably supported on the surface S1 of the substrate 1 by pins 102 and 103, and the rotating arms 100 and 101 rotate about the pins 102 and 103 as fulcrums. 10
4 and 105 are the rotating arms 100 and 1, respectively.
a spring for biasing rotation of 01 in one direction;
Reference numerals 106 and 107 are projections formed on the surface S1 of the substrate 1, and rotation of the rotating arms 100 and 101 in one direction is restricted by these projections 106 and 107. 108, 109 are rotating arms 100, 1
The pins 110 and 111 implanted in 01 are the 11th gear and the 12th gear (see FIGS. 5 and 8) rotatably supported by the rotating arms 100 and 101, respectively. 11, 12th gear 110, 11
1 is located on the back surface S2 side of the substrate 1.

In FIG. 4, when the rotating lever 90 is rotated counterclockwise, the sliding lever 98 slides to the left (Y' direction), and the rotating arm 100 is rotated clockwise against the biasing force of the spring 104. direction. On the other hand, in FIG. 4, when the rotating lever 91 rotates clockwise, the rotating arm 101 rotates counterclockwise against the biasing force of the spring 105. 112 is an idler gear plate rotatably supported on the surface S1 of the substrate 1 by a pin 113, and this idler gear plate 112 has a large diameter 13th gear 114, a 14th gear 115, and a small diameter gear 115.
Fifteen gears 116 and a sixteenth gear 117 are rotatably supported. These 13th to 16th gears 114
117 are located on the back surface S2 side of the substrate 1.
The thirteenth gear 114 and the fifteenth gear 116, the fifteenth gear
gear 116, 16th gear 117, 16th gear 1
17 and 14th gear 115 are always in mesh with each other. Reference numeral 118 denotes a bent part formed by bending a part of the idler gear plate 112 at a substantially right angle, and this bent part 118 is connected to the back surface S2 through an arc-shaped hole in the substrate 1.
protrudes to the side. A hole 119 is formed in the bent portion 118 . 120 is the idler gear plate 112
This is a pin planted in the

In FIGS. 4, 7, and 8, 121 is a head chassis to which a magnetic head 122 is attached, and this head chassis 121 has fixed shafts 123a and 123 fixed to the surface S1 side of the substrate 1.
Long hole 124 into which b, 123c, 123d are inserted
a, 124b, 124c, and 124d are formed. Reference numeral 121S is a spring whose one end is locked to the head chassis 121 and the other end is locked to the board 1, and the head chassis 121 is biased in the X' direction by this spring 121S. The head chassis 121 has the fixed shafts 123a to 123.
d, and can slide in the directions of arrows X and X'. 125, 126 are cam holes formed in the head chassis 121, and these cam holes 125, 12
Recesses 125a and 126a are provided on one side of 6, respectively.
is formed. Pins 108 and 109 of the rotating arms 100 and 101 are inserted into the cam holes 126 and 125, respectively. 127 is a hole formed in the center of the head chassis 121, and this hole 127 is connected to the pin 128 implanted in the surface S1 of the substrate 1 and the pin 120 of the idler gear plate 112.
a narrow elongated hole 127a into which the pin 120 of the idler gear plate 112 is inserted; a wide square hole 127b into which the pin 120 of the idler gear plate 112 is inserted;
7b.
An arm 129 is rotatably supported by a pin 130 on the head chassis 121, and a roller 131 is rotatably supported at the tip of the arm 129. The roller 131 is inserted between the rotary levers 90 and 91, and is also inserted into a keyhole-shaped hole 132 formed in the substrate 1 and protrudes toward the back surface S2 of the substrate 1. 133 is a reel stand hole into which one of the reel stands to be described later is inserted;
134 is a reel stand recess into which the other reel stand is inserted; 135 and 136 are head chassis 121;
A capstan shaft and bearings 137 and 138 provided on the substrate 1 and tape guide pins 139 and 140 fixed to the surface S1 of the substrate 1, which will be described later, are inserted into the holes 135 and 136, respectively. Ru. 141, 142 are pins 155, 156 of pinch roller support arms 151, 152, which will be described later.
is the hole into which it is inserted. Further, 143 is a driving pin fixed to the head chassis 121, and this driving pin 143 penetrates a hole in the board 1, projects to the back surface S2 side of the board 1, and is inserted into the long holes 88, 89 of the links 84, 85. be done.

A sliding plate 144 is slidably supported by the head chassis 121, and this sliding plate 144 is arranged in a direction (Y) perpendicular to the sliding direction (arrow X, −
slide in the Y′ direction). 145 is a square hole formed in the center of the sliding plate 144, and the pin 8 of the lever 81 passing through the hole in the substrate 1 is inserted into this square hole 145.
3 is inserted. Reference numeral 146 denotes a column fixed to the sliding plate 144, and one end of an elastic wire 147 is supported on this column 146. This wire 147 is connected to a bent piece 148 on the back surface S2 of the substrate 1.
is inserted into the hole 149 of the idler gear plate 1.
It is inserted into the hole 119 of the bent portion 118 of No. 12. 1
Reference numeral 50 denotes a spring whose one end is supported by the sliding plate 144 and the other end is supported by the substrate 1, and the sliding plate 144 is stably held at both ends of the sliding range of the sliding plate 144 by this spring 150. Ru.

7 and 8, when the lever 81 slides in the direction of the arrow Y', the sliding plate 144, which is slidably supported on the head chassis 121 by the pin 83 of the lever 81, slides in the direction of the arrow Y'. do.
Therefore, the wire 147 rotates clockwise (clockwise in FIG. 7) using the hole 149 of the bent piece 148 of the substrate 1 as a fulcrum. Therefore, the idler gear plate 112 rotatably supported by the base plate 1 is connected to the pin 1.
13 as a fulcrum and rotates counterclockwise (counterclockwise in FIG. 7). Conversely, lever 81 is arrow Y
When sliding in the direction, the idler gear plate 112 rotates clockwise.

In FIGS. 4 and 7, reference numerals 151 and 152 indicate pinch roller support arms rotatably supported by fixed shafts 123a and 123b on the surface S1 of the substrate 1.
Pinch rollers 153 and 154 are rotatably supported. 155, 156 are pins implanted in the pinch roller support arms 151, 152;
The pins 155 and 156 are inserted into holes 142 and 141 formed in the head chassis 121, respectively, and further into holes 157 and 158 in the substrate 1. When the head chassis 121 moves forward in the direction of arrow X, the holes 142 and 14 of the head chassis 121
The pins 155 and 156 inserted in 1 are driven,
Pinch roller support arms 151, 152 rotate around fixed shafts 123a, 123b.

In FIG. 5, reference numerals 159 and 160 indicate capstan shafts rotatably supported by bearings 137 and 138 attached to the base plate 1, and a flywheel 16 is attached to one end of the capstan shafts 159 and 160.
1,162 is fixed. 161L, 162
L is the flywheel 16 as shown in FIG.
1, a large-diameter gear portion integrally formed with 1
61S, 162S are flywheels 161, 16
This is a small-diameter gear portion integrally formed with 2.

The large-diameter gear portions 161L, 162L of the flywheels 161, 162 are rotatably supported by the rotating arms 101, 100, respectively.
The small-diameter gear portions 161S and 162S of the flywheels 161 and 162 can mesh with the fourteenth gear 115 and the eleventh gear 110, respectively, which are rotatably supported by the idler gear plate 112. It can mesh with 13 gears 114. 1
63 and 164 are U-shaped electromagnets having coils 165 and 166, respectively;
3,164 is a screw 188a on the back surface S2 of the board 1,
188b. Adsorption bodies 93 and 9 supported by the rotating levers 90 and 91, respectively
4 is arranged to face the end faces of the electromagnets 164 and 163.

In FIG. 5, reference numeral 167 is a reel receiving plate fixed to the supports 168a, 168b, 168c on the back surface S2 of the board 1, and the reel stand 171 is fixed to the fixed shafts 169, 170 fixed to the reel receiving plate 167.
172 is rotatably supported. 173,1
74 is a gear part of the reel stands 171, 172;
The gear portion 173 of one reel stand 171 has a 12th gear 111 supported by the rotating arm 101 or a 14th gear 1 supported by the idler gear plate 112.
15 mesh with each other, and the gear part 1 of the other reel stand 172
An eleventh gear 110 supported by the rotating arm 100 or a thirteenth gear 114 supported by the idler gear plate 112 meshes with the gear 74 . 175 is a printed circuit board attached to the reel receiving plate 167, and a cassette detection switch 176 is fixed to this printed circuit board 175, which is closed when the cassette half is set at the playback position (or recording position). Movable piece 1 of this cassette detection switch 176
77 protrudes toward the surface S1 of the substrate 1 through a hole in the substrate 1. 178 has one end connected to the surface S of the substrate 1
When the cassette half is set at the playback position (or recording position), the flexible plate 178 is pushed by the cassette half, and the flexible plate 178 detects the cassette. switch 1
The movable piece 177 of 76 is pushed, and the cassette detection switch 176 is closed (ON). 179 is a changeover switch fixed to the printed circuit board 175, and a movable piece 180 of this changeover switch 179 is
As the slide lever 72 slides, it is driven and switched by the drive pieces 75a, 75b of the slide lever 72. 181 is a reproduction state detection switch fixed to the printed circuit board 175, and this reproduction state detection switch 181 is connected to the head chassis 121.
It is driven and closed by a drive pin 143 implanted in the. 182 and 183 are a light emitting element and a light receiving element respectively fixed to the printed circuit board 175;
The light emitted from the light emitting element 182 is reflected by the label 80 for position detection, and is received by the light receiving element 183.
The position of the rotating lever 77 can be detected based on the amount of light received by the light receiving element 183. 18
4 is a pulley rotatably supported at the corner of the back surface S2 of the substrate 1; 185 is a belt; this belt 185 is a pulley 45 rotatably supported by the rotating shaft 41 of the motor 40; It is hung on flywheels 161 and 162.

In FIG. 5, 186 and 187 are reel stand 1
71, 172, and these labels 186, 187 consist of a black part and a reflective part. This reel stand 171,1
Light emitting elements 190, 191 are mounted on the printed circuit board 175 facing the labels 186, 187 of 72, respectively.
and light receiving elements 192 and 193 are arranged.
Labels 186, 1 from each light emitting element 190, 191
Light is emitted towards 87. This light is label 1
The light is reflected by the reflective parts 86 and 187 and received by the light receiving elements 192 and 193, but the label 18
There is almost no reflection in the black part of 6,187.
Therefore, when the reel stands 171, 172 are rotating, the light receiving elements 192, 193 output rectangular signals. On the other hand, reel stands 171, 17
2 is stopped, the light receiving elements 192, 1
93 outputs a signal at a constant level. 18
Reference numeral 9 denotes a cover plate screwed to the supports 168a, 168c of the substrate 1.

FIG. 14 shows a control system that controls the motor 40, plunger solenoid 53, and electromagnets 163 and 164 based on the states of the mechanical parts and various operation switches.

In FIG. 14, 200 is a control circuit consisting of a central control unit (CPU), read-only memory (ROM), readable memory (RAM), etc., and this control circuit 200 detects the state of the mechanical section. Detection means, ie, cassette insertion detection switch 15, cassette detection switch 176,
Reproduction state detection switch 181, light receiving element 183,
192, 193, the changeover switch 179, the ejection detection switch 16, and the outputs of the non-detection circuit 201 are input. Reference numeral 202 indicates a first cassette half used when the operation is stopped and the cassette half is ejected from the device in an operating state such as a playback state or a recording state.
203 is a second operation switch used for fast forwarding (FF) the magnetic tape;
Reference numeral 204 is a third operation switch used when rewinding (REW) the magnetic tape, and 205 is used to switch from the reproduction state of one channel (for example, side A) of the magnetic tape to the reproduction of the other channel (for example, side B). A fourth operation switch used in cases, etc.
206 is a fifth operation switch used to temporarily interrupt playback during magnetic tape playback operation, etc. 207 is used to select a predetermined song from among a plurality of songs recorded on the magnetic tape. This is a sixth operation switch, and this sixth operation switch 207 and the second (or third) operation switch 2
03 and 204, it is possible to automatically select a plurality of songs ahead or before the currently playing song. For example, the seventh operation switch 2
07 and the second switch 203
Press three times to fast forward (FF) to the beginning of the next song. The outputs of the various detection means and the outputs of the various operation switches are input to the input port 208 of the control circuit 200. Reference numeral 209 indicates a mechanism state detection means for detecting the output states of the various detection means described above, and 210 indicates a mechanism state determination means for determining the current state of the mechanism based on the detection result of the mechanism state detection means 209. Judgment means 210
The determination result is output to the control means 211. 21
Reference numeral 2 denotes a monitoring means for monitoring the detection state of the mechanism state detection means 209. For example, this monitoring means 212 monitors whether a cassette half is inserted and after a predetermined period of time has passed, the state has shifted to the playback state. 213 indicates whether the operation is normal based on the monitoring result of the monitoring means 212;
It is an abnormality determining means for determining an abnormality, and the determination result of this abnormality determining means 213 is transmitted to the control means 211.
is input. Reference numeral 214 denotes voiced/unvoiced determining means for determining whether the reproduced output from the magnetic head continues for a predetermined period of time, and the determination result of this voiced/unvoiced determining means 214 is input to the control means 211. 215 is key input detection means for detecting whether or not the various operation switches 202 to 207 are operated; 216;
is a key input determining means that determines the next operation mode based on the detection result of the key input detecting means 215, and the determination result of this key input determining means 216 is inputted to the control means 211. The control means 2
11 is each of the above means 213, 210, 214, 21
Based on the output of 6, various control signals are output.
This control signal is sent to the motor drive circuit 218, plunger drive circuit 219,
In addition to the electromagnet drive circuits 220 and 221, the motor 40, the plunger solenoid 53, and the electromagnet 16
3,164 are controlled.

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

(A) Operation of transporting the cassette half from the cassette insertion section 58 to the playback position (see timing chart in FIG. 15).

When the cassette half is inserted into the cassette insertion section 58, the cassette detection piece 18 is rotated clockwise by the inserted cassette half, and the cassette insertion detection switch 15 is closed (ON) (at time T1 in FIG. 15 ₎ . ), current is supplied to the plunger solenoid 53, and the movable iron core 54 of the plunger solenoid 53 is attracted against the biasing force of the spring 56. As the movable iron core 54 is attracted, the mode clutch lever 48 moves the movable iron core 5
4, the mode clutch lever 48 rotates, and the large diameter gear portion 49L of the third gear 49 rotatably supported by the mode clutch lever 48 is driven by the pin 55 of the motor 40.
1 meshes with the first gear 42 press-fitted into the first gear 42 . Furthermore, after a predetermined period of time (for example, 100 mS) has elapsed after the cassette insertion detection switch 15 is closed (ON), current is supplied to the motor 40 (the first
₅ ), the rotating shaft 41 of the motor 40 rotates clockwise (CW). The rotational driving force of this motor 40 is transferred from the first gear 42 to the third gear 49.
→Fourth gear 50→Fifth gear 51→Sixth gear 52→Rack 22 of the carriage 21, and the carriage 21 is transferred rearward (Y' direction) while the cassette half is stopped. When the carriage 21 is transported to a predetermined position, the cassette engaging claw 25 of the cartridge 21 engages with the hole edge of the tape exposed surface of the cassette half, and the cassette half is also transported rearward (in the Y' direction) together with the carriage 21. be done.

When the carriage 21 is further moved rearward, the pin 24 of the carriage 21 comes into contact with the cam portion 36 of the cassette holding plate 35, causing the cassette holding plate 35 to rotate (in the direction of arrow R in FIG. 4), and the carriage 21 Since the pin 10 inserted into the cam groove 23 moves to the bent part 23a of the cam groove 23, the link 8 rotates, and the long pin 11 fixed to the link 8 moves toward the substrate 1. For this reason, the lifter plates 30 and 3 whose rotation in the direction of the board 1 was restricted by the long pins 11
1 rotates in the direction of the substrate 1. By the rotation of the cassette holding plate 35 and the rotation of the lifter plates 30, 31, the cassette half transferred rearward is moved in the direction of the substrate 1 (Z direction). With the rotation of the cassette holding plate 35 and the rotation of the lifter plates 30 and 31, the cassette half descends in the direction of the substrate 1, and when it descends to a predetermined position, the flexible plate 178 is pushed by the cassette half, and then This flexible plate 178 drives the movable piece 177 of the cassette detection switch 176, and the cassette detection switch 176 is closed (T ₄ in FIG. 15).
(time), it is detected that the cassette half has been placed in the playback position.

By the above operations, the inserted cassette half is set at the playback position.

(B) Operation of running the magnetic tape in the cassette half set at the playback position (see timing chart in Figure 15).

When the cassette half is set at the playback position and the cassette detection switch 176 is closed, the current supply to the motor 40 is cut off, rotation of the motor 40 is stopped, and the current supply to the plunger solenoid 53 is cut off. For this reason,
The movable iron core 54 of the plunger solenoid 53 is pulled outward by the biasing force of the spring 56, the mode clutch lever 48 is rotated clockwise, and the third gear 49 and the first gear 42 are disengaged. It becomes a non-meshing relationship.

As the mode clutch lever 48 rotates clockwise, the clutch lever 62 connected to the mode clutch lever 48 rotates clockwise, and the eighth gear 63 rotatably supported by the clutch lever 62 rotates. The large diameter gear portion 63L meshes with the second gear 43.

After the cassette detection switch 176 is closed,
After a predetermined period of time (for example, 100 mS) has elapsed (the first
₅ ) Current is supplied to the motor 40,
This motor 40 rotates clockwise (CW).

When the motor 40 rotates clockwise, the rotational driving force of the motor 40 is applied to the rotation shaft 4 of the motor 40.
1 → first gear 42 → pawl 44 → second gear 43
-> 8th gear 63 -> 7th gear 61 -> 9th gear 66 -> 10th gear 68, and the 10th gear 68 rotates clockwise from the state shown in FIG. 13A. As the tenth gear 68 rotates clockwise, the lever 70 moves and the sliding lever 72 slidably supported on the base plate 1 slides in the Y direction.

As the sliding lever 72 slides in the Y direction,
A pin 74 implanted in the sliding lever 72 contacts the link 84 and rotates the link 84 clockwise (see FIG. 7). Since the drive pin 143 fixed to the head chassis 121 is inserted into the elongated hole 88 of the link 84, as the link 84 rotates clockwise, the drive pin 14
3 is driven, and the head chassis 121 moves in the direction of arrow X against the biasing force of the spring 121S. As the sliding lever 72 further slides in the Y direction, the output of the light receiving element 183 decreases (at time _T6 in FIG. 15), and the movable piece 180 of the changeover switch 179 moves towards the driving piece 75b of the sliding lever 72.
is driven in the Y direction by the changeover switch 179.
is switched (at time _T7 in FIG. 15). When the tenth gear 68 rotates nearly 90 degrees in the direction of the point shown in FIG. 13A, the drive pin 143 driven by the link 84 in the direction of arrow The state detection switch 181 closes (as shown in Fig. 15).
(as of T ₈ ). Further, as the tenth gear 68 rotates clockwise, the sliding lever 72 that had been sliding in the Y direction begins to slide in the Y' direction, and the link 8
4 begins to rotate counterclockwise, the reproduction state detection switch 181 is opened, and the output of the light receiving element 183 increases (at time _T9 in FIG. 15). As the sliding lever 72 further slides in the Y' direction, the output of the light receiving element 183 decreases (T ₁₀ in FIG. 15).
time). When the sliding lever 72 passes through the state shown in FIG. 13B and further rotates clockwise, the pin 73 of the sliding lever 72 comes into contact with the link 85.
This link 85 is rotated counterclockwise to again drive the drive pin 143 of the head chassis 121 in the direction of arrow X.

When the tenth gear 68 further rotates clockwise from the state shown in FIG. 13B, the changeover switch 1
79 is switched by the drive piece 75a of the sliding lever 72 (at time _T11 in FIG. 15). When the tenth gear 68 further rotates approximately 90 degrees clockwise from the state shown in FIG.
is closed, and current is supplied to the electromagnets 163 and 164 (at time _T12 in FIG. 15). electromagnet 163,
When current is supplied to 164, the rotating lever 9
0,91 adsorbents 93,94 are electromagnets 164,
163, and the rotating levers 90, 9
1 is held in a closed state as shown in FIG. 1A. In this state, the tenth gear 68 further rotates clockwise, the sliding lever 72 begins to slide leftward again, and the link 85 becomes able to rotate clockwise, but the roller 131 of the head chassis 121 Rotating lever 9 held in closed leg state
Since the position is restricted by 0 and 91, the head chassis 121 does not return in the direction of arrow X' due to the biasing force of the spring 121S. When the tenth gear 68 rotates once from the state shown in FIG. 13A and returns to its original position, the output of the light receiving element 183 increases again (at time _T13 in FIG. 15). This light receiving element 18
When the third output rises for the second time, the supply of current to the motor 40 is cut off, and the rotation of the motor 40 is stopped. When a predetermined period of time (for example, 100 mS) has elapsed since the second rise (T ₁₃ ) of the output of the light receiving element 183, the motor 40 rotates counterclockwise (at time T ₁₄ in FIG. 15).

As the head chassis 121 moves in the direction of the arrow X, the pins 155, 1 inserted into the holes 141, 142 of the head chassis 121
56 is driven, the pinch roller support arms 151 and 152 rotate, and the pinch roller 15
3 and 154 move in the direction approaching the capstan shafts 159 and 160. Further, the magnetic head 122 attached to the head chassis 121 also approaches the magnetic tape in the cassette.

Furthermore, while the tenth gear 68 makes one rotation clockwise from the state shown in FIG. do. For this reason,
By the pin 83 of the lever 81, the sliding plate 144 is driven first to the left (Y direction), then to the right (Y' direction), and further to the left.
When it rotates once and returns to its original state, the sliding plate 144
is maintained in a state where it is driven in the left direction (Y direction). One end of a wire 147 is supported by the support 146 of the sliding plate 144, and this wire 147
is inserted into the hole 149 of the bent piece 148 of the board 1, and the other end is inserted into the bent piece 11 of the idler gear plate 112.
Since it is inserted into the hole 119 of 8, the sliding plate 1
44 is driven in the left direction (Y direction), the wire rod 147 is in a state of being rotated counterclockwise (FIGS. 7 and 8) using the bent piece 148 of the board 1 as a fulcrum, and the idler gear plate 112 is rotated clockwise, and the 14th gear 115 rotatably supported by the idler gear plate 112 meshes with the small diameter gear portion 161S of the flywheel 161, and the 14th gear 115 rotatably supported by the idler gear plate 112 The 13th gear 114 is the reel stand 172
It meshes with the gear part 174 of.

When the tenth gear 68 is rotated 360 degrees from the position shown in FIG. 13A, the spring 1
Rotating arm 100 by urging force of 04,105
The rotation of the rotation arm 101 and the rotation of the rotation arm 101 are caused by the pins 108, 109 of the rotation arms 104, 105 and the cam holes 125, 126 of the head chassis 121.
Because it is regulated by locking with
In the state shown in , the eleventh and twelfth gears 110,
111 are large diameter gear parts 161L, 162L of flywheels 161, 162 and reel stand 1
It does not mesh with the gear parts 173, 174 of 71, 172.

As described above, the tenth gear 68 is
When the head chassis 121 is rotated 360 degrees from the state shown in _FIG . The magnetic tape is held between a pinch roller and a capstan shaft,
The magnetic head contacts the magnetic tape, and (c) the small diameter gear portion 16 of the flywheel 161
1S and the 14th gear 115 and the 13th gear 1
(d) The eleventh gear 110 and the twelfth gear 111 mesh with the large diameter gear parts 162L, 161L of the flywheels 162, 161, and the reel stand 172, respectively. (e) The clockwise rotation of the motor 40 is stopped.

From this state, for a predetermined period of time (for example, 100mS)
After the lapse of time, current is supplied to the motor 40, and the motor 40 rotates counterclockwise (as shown in FIG. 15).
(as of T ₁₄ ).

When the motor 40 rotates counterclockwise, the rotational driving force of the motor 40 is transferred from the first gear 42 to the pawl 46.
It is transmitted to the flywheels 161 and 162 via the → pulley 45 → belt 185 → pulley 184, and the flywheel 161 rotates counterclockwise and the flywheel 162 rotates clockwise.

The rotational driving force of the flywheel 161 is generated by the small diameter gear portion 161S of the flywheel 161.
14th gear 115 that meshes with → 16th gear 11
7→15th gear 116→13th gear 114, the signal is transmitted to the gear portion 174 of the reel stand 172 with which the thirteenth gear 114 meshes, and the reel stand 1
72 rotates clockwise. Therefore, the reel built into the cassette half that engages with the reel stand 172 rotates clockwise, causing the magnetic tape in the cassette to run, thereby playing back side A.

(C) Operation of shifting from side A playback state to fast forward (FF) state (see timing chart in Figure 16).

When the fast forward (FF) operation switch 203 is operated in the playing state of side A (at time _T1 in FIG. 16), the counterclockwise rotation of the motor 40 is stopped and the electromagnets 163 and 164 are
The current supply to is cut off (at time _T2 in FIG. 16). Therefore, the attraction of the attraction bodies 94, 93 by the electromagnets 163, 164 is released, and the rotation levers 90, 91 become rotatable. Therefore, the roller 131, whose movement in the direction of arrow X' has been restricted by the rotation levers 90 and 91, moves in the direction of arrow X' due to the biasing force of the spring 121S. As a result, the reproduction state detection switch 181 is opened (OFF) (at time _T2 in FIG. 16). _T2
When a predetermined time (for example, 100 mS) has elapsed from this point, the motor 40 starts rotating clockwise (at time _T3 in FIG. 16). For this reason, the tenth gear 68
makes one rotation clockwise. This tenth gear 68
At time _T10 during one rotation of the head chassis 121, that is, when the head chassis 121 is driven in the direction of arrow X and the regeneration state detection switch 181 is closed, current is supplied only to the electromagnet 164. after that
The rotation of the motor 40 stops at time _T11 , that is, at the time when the output of the light receiving element 183 rises. Here, the movement of the roller 131 between T ₁₀ and T ₁₁ will be explained. At time T ₁₀ , roller 131
is in the state where it has moved the most in the direction of the arrow X, as shown in FIG. be done. However, since no current is supplied to the other electromagnets 163, the rotary lever 91 is rotatable. Thereafter, the link 85 rotates clockwise in accordance with the rotation of the tenth gear 68, and the head chassis 121 moves in the direction of arrow X'. According to the movement of the head chassis 121, the roller 1
31 also moves, but only the rotary lever 91 can be rotated, so the roller 131 is moved by the rotary lever 90.
The rotating lever 91 moves along the inclined surface 96 of the
The movement of the roller 131 in the direction of arrow X' is restricted by the edge of the keyhole-shaped hole 132 in the substrate 1 and the inclined surface 96 of the rotary lever 90 (FIG. 1B). In the state shown in FIG. 1B, the magnetic head 122 is slightly retracted compared to the state shown in FIG. be able to. When the rotating lever 91 is rotated by the roller 131, the rotating arm 101
is rotated clockwise, and the twelfth gear 111 supported by the rotation arm 101 is rotated clockwise.
The gear portion 173 of the flywheel 161 and the large diameter gear portion 161L of the flywheel 161 do not mesh with each other. On the other hand, the pin 108 of the rotating arm 100 is inserted into the recess 126 of the cam hole 126 of the head chassis 121.
6a, the eleventh gear 110 supported by the rotating arm 100 meshes with the gear portion 174 of the reel stand 172 and the large diameter gear portion 162L of the flywheel 162. In addition, in this state, the pin 120 of the idler gear plate 112 is
Since it is inserted into the long hole 127a of the head chassis 121, the 13th and
14 gears 114 and 115 are reel stands 172 and 1
71 gear parts 174, 173 and small diameter gear parts 162S of flywheels 162, 161,
It is in a state where it does not mesh with 161S. after that,
At time _T11 , the rotation of the motor 40 stops. The motor 40 stops rotating for a predetermined period of time (for example, 100 m).
S), the motor 40 rotates counterclockwise (at time _T12 in FIG. 16), and this rotational driving force is transmitted to the flywheel 16 via the belt 185.
Further, the rotational driving force of the flywheel 162 is transmitted from the large diameter gear portion 162L of the flywheel 162 to the eleventh gear 110 to the gear portion 174 of the reel stand 172, thereby rapidly forwarding the magnetic tape.

(D) Operation of shifting from side A playback state to fast rewind (REW) state (see timing chart in Figure 16).

The operation switch 204 for fast rewind (REW) is operated, and the fast rewind (REW) is started from the A-side playback state.
The operation of transitioning to this state is similar to the operation of transitioning from the A-side playback state to the fast forward (FF) state shown in FIG. 16, but at time T ₁₀ in FIG. 16, current is supplied only to the electromagnet 163. The points are different. When current is supplied only to the electromagnet ₁₆₃ at time T10 in FIG. 16, the attracting body 94 is attracted by the electromagnet 163, and as a result, the rotation of the rotating lever 91 is restricted. On the other hand, since the rotary lever 90 is in a rotatable state, when the roller 131 moves in the direction of arrow X',
The rotary lever 90 is rotated clockwise (FIG. 7) by the roller 131. As a result, the rotating arm 100 is rotated via the sliding lever 98, and the eleventh gear 110 supported by the rotating arm 100 is moved to the gear portion 174 of the reel stand 172.
and large diameter gear part 1 of flywheel 162
It will be in a state where it does not mesh with 62L. On the other hand, in this state, the pin 109 of the rotating arm 101 is inserted into the recess 125 of the cam hole 125 of the head chassis 121.
5a, the twelfth gear 111 supported by the rotating arm 101 meshes with the gear portion 173 of the reel stand 171 and the large diameter gear portion 161L of the flywheel 161. As a result, the 16th
When the motor 40 begins to rotate counterclockwise at time T ₁₂ in the figure, this rotational driving force is applied to the belt 185 →
The signal is transmitted from the flywheel 161 to the twelfth gear 111 to the reel stand 171, and a quick return (REW) operation is performed.

(E) Operation of shifting from the A-side fast forward (FF) state to the A-side playback state (see timing chart in Figure 17).

In the fast forward (FF) state of side A, in order to end this fast forward state, the STOP operation switch 202 is operated (at time _T1 in FIG. 17), and after a predetermined time the motor 4
0 stops, and the current supply to the electromagnet 164 is cut off (at time _T2 in FIG. 17).
After that, after a predetermined period of time (for example, 100mS) has passed,
Current is supplied to the motor 40, and the motor 40 rotates clockwise (at time _T3 in FIG. 17). Therefore, the tenth gear 68 rotates once and stops at time _T10 . During this period, at time T ₉ , the regeneration state detection switch 181 closes and the electromagnet 16
3,164 is supplied with current. Therefore, the roller 131 is moved by the rotation levers 90 and 91.
Movement in the direction of arrow X' is restricted, and the head chassis 121 is held at the playback position. For this reason,
When the motor 40 begins to rotate counterclockwise at time _T11 in FIG. 17, the A side is reproduced.

(F) Operation of shifting from side A playback state to side B playback state (see timing chart in Figure 18).

As shown in FIG. 18, when the program switching operation switch 205 is operated in the A-side playback state (time _T1 in FIG. 18), the rotation of the motor 40 stops at time _T2 after a predetermined time. At the same time, the current supply to the electromagnets 163 and 164 is cut off. After that, for a predetermined period of time (e.g.
100 mS), current is supplied to the motor 40, and the motor 40 rotates clockwise (at time _T3 in FIG. 18). For this reason, the tenth gear 68
rotates approximately 180° clockwise and stops at T ₇ . During this period, the changeover switch 179 is switched at time _T5 , and the regeneration state detection switch 181 is closed at time _T6 , and current is supplied to the electromagnets 163 and 164. 10th gear 6 between T ₃ and _{T 7}
8 rotates approximately 180° from the state shown in FIG. 13A to the state shown in FIG. Driven in the right direction (Y' direction). Therefore, the idler gear plate 112 is driven counterclockwise,
The thirteenth gear 114 of the idler gear plate 112 meshes with the small diameter gear part 162S of the flywheel 162, and the fourteenth gear 115 meshes with the small diameter gear part 162S of the flywheel 162.
It meshes with the gear portion 173 of No. 1. For this reason, the first
When the motor 40 rotates counterclockwise at time T ₈ in Figure 8, the rotational driving force is transmitted from the belt 185 to the flywheel 162 to the 13th gear 114 to the 15th gear.
The magnetic tape is transmitted from the gear 116 to the 16th gear 117 to the 14th gear 115 to the reel stand 171, the magnetic tape is run, and side B is reproduced.

(G) Operation of shifting to the playback state of side B at the end of side A (see timing chart in Figure 19).

As shown in FIG. 19, in the reproduction state of side A, since the reel stands 171 and 172 are rotating, a rectangular signal is output from the light receiving element 192. This is the end of side A (19th
At _T1 in the figure), the reel stands 171 and 172 stop rotating, and the light receiving element 192 no longer outputs a rectangular signal. In the A-side playback state,
The timer of the control circuit is reset when the output of the light receiving element 192 falls, and the reel stand 17
1 stops rotating and the timer cannot be reset, the timer counts up.
When the timer counts up to a predetermined value, the current supply to the motor 40 is cut off, the rotation of the motor 40 is stopped, and the electromagnets 163 and 16 are stopped.
The current supply to 4 is cut off (T ₂ in Figure 19).
time). Therefore, the roller 131 whose movement in the direction of the arrow X' has been restricted by the rotary levers 90 and 91 moves in the direction of the arrow X' together with the head chassis 121 due to the biasing force of the spring 121S. Therefore, the reproduction state detection switch 181 is opened. After that, when a predetermined period of time has elapsed, current is supplied to the motor 40, and the motor 40
rotates clockwise (at time _T3 in Figure 19).
Therefore, the tenth gear 68 rotates 180° clockwise and stops at time _T7 . During this time, the changeover switch 179 is switched at time _T3 , and the regeneration state detection switch 181 is closed at time _T6 , and current is supplied to the electromagnets 163 and 164. Also,
While the tenth gear 68 rotates 180° clockwise, the sliding plate 144 slidably supported by the head chassis 121 is driven to the right (Y' direction) by the pin 83 of the lever 81. , the idler gear plate 112 is driven counterclockwise by the wire rod 147, the 13th gear 114 meshes with the small diameter gear part 162S of the flywheel 162, and the 14th gear 115 meshes with the gear part 173 of the reel stand 171. mesh with. As a result, when the motor 40 rotates counterclockwise at time T ₈ , this rotational driving force is transferred from the belt 185 to the flywheel 1.
62 → 13th gear 114 → 15th gear 116 →
The signal is transmitted from the 16th gear 117 to the 14th gear 115 to the reel stand 171, and the B side is brought into playback state.

(H) Stop the playback of side A or B and eject the cassette half (see timing chart in Figure 20).

When the EJECT operation switch 202 is operated in the A-side (or B-side) playback state (at time _T1 in FIG. 20), the rotation of the motor 40 stops after a predetermined period of time, and the electromagnets 163, 1
The current supply to 64 is cut off (see Figure 20).
_T2 time points). Therefore, the head chassis 121 moves in the direction of the arrow X', and the reproduction state detection switch 181 is opened. Further, since current is supplied to the plunger solenoid 53 at time _T2 , the mode clutch lever 48 is rotated counterclockwise, and the clutch lever 62 is rotated counterclockwise by the mode clutch lever 48. Therefore, the third gear 49 supported by the mode clutch lever 48 meshes with the first gear 42 fixed to the rotating shaft 41 of the motor 40.
Further, the engagement between the large diameter gear 63L of the eighth gear 63 supported by the clutch lever 62 and the second gear 43 is released. When a predetermined period of time (for example, 100 mS) has elapsed from time _T2 , the motor 40 begins to rotate counterclockwise (time _T3 in FIG. 20). Therefore, the rotational driving force of the motor 40 is
The signal is transmitted from the third gear 49 to the fourth gear 50 to the fifth gear 51 to the sixth gear 52 to the rack 22, and the carriage 21 moves in the direction of arrow Y.
As the carriage 21 moves in the direction of arrow Y, the cassette holding plate 35 rotates, and the link 8 rotates clockwise, so the lifter plates 30 and 31 move away from the board 1 (in the direction in which the lifter plates 30 and 31 are opened). (in the direction that reduces the leg angle). Therefore, the cassette half is moved away from the substrate 1. Therefore, at time _T4 in FIG. 20, the cassette detection switch 176 is opened (OFF). Thereafter, the cassette half is transported in the direction of arrow Y by the carriage 21,
At _T5 , the cassette insertion detection switch 15 is opened (OFF), and at _T6 , the ejection detection switch 16 is opened (OFF), and the motor 4
The current supply to the plunger solenoid 53 is cut off, and the current supply to the plunger solenoid 53 is also cut off, thereby completing the ejecting operation.

Note that the other operations are operations that are partially different from each of the above operations, and since the details can be understood from the above operations, the details will be omitted.

Effects of the Invention According to the present invention, the head chassis is moved against the biasing force of the elastic body by a pair of rotating levers held in an open leg state, and between one rotating lever held in a closed leg state and a base plate. The positioning is performed directly by the hole edge of the hole, and compared to the conventional method in which the headshaft is positioned indirectly through multiple arms, levers, etc., the positioning accuracy during recording, playback, or fast forwarding or fast reversing is improved. It will improve.

Furthermore, the present invention has the advantage that the configuration is simple because the fast-forwarding direction of the tape can be determined using a pair of rotary levers for positioning the head chassis.

[Brief explanation of drawings]

Figures 1A, B, and C are diagrams showing the basic operation of a magnetic recording/reproducing device according to an embodiment of the present invention, Figure 2 is a perspective view of the front side of the device, and Figure 3 is a perspective view of the back side of the device. 4 is an exploded perspective view of the front side of the device, FIG. 5 is an exploded perspective view of the back side of the device, and FIG. 6 is an exploded perspective view of the front side of the device.
The figure is an exploded perspective view of the vicinity of the motor of the same device, FIG. 7 is an exploded perspective view of the main part of the magnetic tape running mode switching mechanism of the same device, FIG. 8 is an exploded perspective view of a part of the same device, and FIG. 9 A and B are the first gears 4 used in the device
2, FIG. 10A is a top view of the second gear 43 used in the same device, FIG. 10B is a bottom view of the pulley 45 used in the same device, FIG. 11A,
B is a diagram showing the relationship between the first gear, pulley, and pawl of the device, FIG. 12 is a perspective view of the flywheel used in the device, and FIGS. 13A and B are the magnetic tape running mode switching mechanism of the device. Partial operation explanatory diagram, 1st
Figure 4 is a block diagram of the control system of the same device, and Figures 15-
FIG. 20 is a timing chart of the same device. 1... Board, 15... Cassette insertion detection switch, 16... Ejection detection switch, 21...
Carriage, 22... Rack, 30, 31... Lifter plate, 35... Cassette holding plate, 40... Motor, 41... Rotating shaft, 42... First gear, 43
...Second gear, 44...Claw, 45...Pulley,
46...Claw, 48...Mode clutch lever, 4
9...Third gear, 50...Fourth gear, 51...
...Fifth gear, 51...Sixth gear, 53...Plunger solenoid, 61...Seventh gear, 62
...Clutch lever, 63...Eighth gear, 66
...9th gear, 68...10th gear, 70...
Lever, 72... Sliding lever, 73, 74... Pin, 77... Rotating lever, 84, 85... Link, 90, 91... Rotating lever, 93, 94...
Adsorption body, 98...Sliding lever, 100, 101...
...Rotating arm, 110...Eleventh gear, 111...
...12th gear, 112...Idler gear plate, 11
4...13th gear, 115...14th gear, 11
6...15th gear, 117...16th gear, 12
1...Head chassis, 122...Magnetic head,
129...Arm, 131...Roller, 137,
138... Bearing, 143... Drive pin, 144...
...Sliding plate, 147...Wire rod, 153,154...
Pinch roller, 159, 160... Capstan shaft, 161, 162... Flywheel, 16
3,164...Electromagnet, 171,172...Reel stand, 176...Cassette detection switch, 179
...Selector switch, 181...Regeneration state detection switch, 184...Pulley, 185...Belt, 2
00...Control circuit, 202-207...Operation switch.

Claims (1)

[Claims] 1. A head chassis slidably supported on a substrate, an elastic body that biases the head chassis in one direction, a drive means that drives the head chassis against the biasing force of the elastic body, and a drive means provided on the head chassis. a pair of rotating levers supported on the base plate so as to be able to open and close; an adsorbent provided on each of the rotating levers; and an engaging member that attracts each of the adsorbents to bring each of the rotating levers into a closed state. A pair of electromagnets for holding, a hole formed in the substrate into which the engaging member is movably inserted, and a fast-forwarding direction determining means for determining a fast-forwarding direction in conjunction with rotation of each of the rotating levers. , the engaging member is engaged by one of the rotary levers held in the closed state by the electromagnet and the edge of the hole in the substrate to hold the head chassis in the fast forward position;
A magnetic recording and reproducing apparatus characterized in that the fast-forwarding direction determining means is controlled in accordance with the open and closed states of each rotary lever.