JPH0227741B2 - TEEPUROKUSAIKIMATAHASAISEIKI - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a tape recorder/player, and is particularly suitable for use in a cassette tape type portable tape recorder or tape player. A portable or pocketable cassette-type tape recorder or tape player in which the operation buttons for recording, playback, fast forward, rewind, etc. are electrical contact switches or feather touch switches, and the operation mode is switched by a control motor. is proposed. In such a tape recorder or player, simply linking the conventional mechanical mode switching mechanism to a motor-based drive device would require a powerful torque motor and a large-capacity power supply, which would reduce the value of a compact product. is reduced. Therefore, the present invention is devised to reduce the load on the control motor for the reciprocating motion of the head board, which requires a particularly large drive torque, so that it can be driven by an ultra-small motor and a small-capacity battery. . Embodiments of the present invention will be described below based on the drawings. FIG. 1 is a perspective view of a cassette tape recorder to which the present invention is applied, with the cassette lid open.
As shown in FIG. 1, the operation surface of this cassette tape recorder includes a record button 1, a play button 2, a stop button 3, a rewind button 4, a fast forward button 5, and a microphone 6.
is located. These operation buttons 1 to 5 are equipped with electrical pushbutton connection switches, and in response to these operations, the capstan motor and two microcontrol motors are controlled, setting the operation mode and running the tape. be exposed. The cassette is attached to the back side of the cassette lid 7, and by closing the lid 7, the positioning pins 8 and 9 are inserted into the positioning holes of the cassette, and the cassette is set in the play state. At the same time, the take-up reel 10, supply reel 11 and capstan 12 are inserted into predetermined positions in the cassette. If, for example, the play button 2 is pressed in this state, the recording/reproducing head 13 and the pinch roller 14 are advanced and rotated by the control motor to their respective operating positions, and the capstan motor is further rotated to perform playback. . Also, if you operate record button 1,
In addition to the operations described above, erasing head 15 is rotated to its operative position. Furthermore, when the rewind button 4 or the fast forward button 5 is operated, the gear combination is changed so that the power of the motor that drives the capstan 12 is directly transmitted to the take-up reel stand or the supply reel stand, allowing the tape to be rewound or A fast forward motion is performed. FIG. 2 is a plan view of the cassette mounting portion of FIG. 1 with the tape cassette 17 mounted thereon. The cassette 17 is positioned by positioning pins 8, 9 and a leaf spring 18. The recording/reproducing head 13 is disposed on a head board 20 that is slidably attached to the chassis 19, and has a stop mode position (returning position) shown in FIG. movement position). The pinch roller 14 is rotatably attached to the chassis 19 by a pinch roller lever 22 and a fulcrum pin 23. Further, the erasing head 15 is rotatably attached to the chassis 19 by an erasing head lever 25 and its fulcrum pin 26. FIG. 3 is a plan view showing the tape drive system. As shown in FIG. 3, the capstan 12 and the winding
The supply reels 10 and 11 are rotationally driven by a drive motor 27. The belt 3 is attached to the motor pulley 28.
0 is hung, and this belt 30 connects the capstan flywheel 31 which is coaxial with the capstan 12.
and the reversing flywheel 29 is driven. The motor 27 rotates in the direction of arrow A, thereby rotating the capstan flywheel 31 in the direction of arrow B (counterclockwise), and the reversing flywheel 29 rotates in the direction of arrow C.
direction (clockwise). The flywheels 29 and 30 have substantially the same mass and radius, and are rotated in opposite directions to obtain an anti-rolling effect that stabilizes tape running against the swinging of the entire cassette player. If the tape is fed at a constant speed in the forward direction (FWD) during playback (PLAY) or recording (REC),
An idler 34 is arranged between a drive wheel 32 coaxial with the capstan 12 and a take-up reel stand 33.
is moved in the direction of arrow D and comes into rolling contact with both of them, thereby rotating the take-up reel 10 in the direction of arrow PLAY/REC and winding the tape onto the take-up reel hub. During fast forwarding (FF), reverse flywheel 2
9 is moved in the direction of arrow E, a gear 35 coaxial with the reversing flywheel 29 is meshed with a gear 37 coaxial with the take-up reel stand 33, and the take-up reel 10 is rotated at high speed in the direction of arrow FF. This allows the tape to be fast-forwarded at high speed. During rewinding (REW), the intermediate gear 38 disposed between the reversing flywheel 29 and the supply reel 11 is moved in the direction of arrow F, and the gear 39 coaxial with the reversing flywheel 29 and the supply reel 11 and a coaxial gear 40. As a result, the supply reel 11 is rotated at high speed in the direction of the arrow REW, and the tape is rewound at high speed. FIG. 4 is a plan view of the head board drive mechanism and mode switching mechanism, showing the stop mode positions of each mechanism. FIG. 5 is a plan view showing details of the main parts of the head board. As shown in FIG. 5, a guide pin 41 is implanted in the base 20a of the head board 20, and this guide pin 41 and a rectangular notch 42 formed in the chassis 19 are slidably engaged.
Further, the head 20b of the head board 20 has an elongated hole 43.
is formed, and this elongated hole 43 and a guide pin 44 implanted in the chassis 19 are slidably engaged. Therefore, the head board 20 is
It is supported by a chassis 19 so as to be slidable in the PLAY/REC and STOP directions. As shown in FIG. 4, the recording/reproducing head 13 is fitted with screws 47a and 47a, respectively, through the head mounting plate 45 and into screw holes formed in the guide pin 41 and the head board 20.
47b is also fixed. The head board 20 has one end 20d engaged with the free end 22a of the pinch roller lever 22, and is always moved in the forward direction together with the pinch roller 14 by a pinch pressure spring 48 that biases the pinch roller 22. is energized by On the other hand, the head board 20
The tip 20c of the head 20b is in contact with a crank pin 50 that is moved in a reciprocating arc by a control motor 49. Therefore, during playback or recording, the control motor 49 causes the crank pin 50 to move as shown in FIG.
When the head board 20 is rotated within a range of approximately ±90 degrees to the REC position or the PLAY position, the head board 20 is advanced to the forward movement position. As a result, the recording/reproducing head 13 is advanced to the tape contact position. The crank pin 50 is installed at an eccentric position of the gear 51, as shown in the plan view of the control motor board in FIG. Note that the tip 20 of the head board 20
A sliding ring 50a is inserted through the crank pin 50 to reduce friction with the crank pin 50. A gear 51 having a crank pin 50 is driven by a worm 49a fitted into the shaft of the motor 49 via an intermediate gear 52 and a worm gear 53. As shown in FIG. 4, a limiter plate 54 is disposed on the back side of the head board 20, and is slidably engaged with the head board and is reciprocated together with the head board 20 by a crank pin 50. There is.
This limiter plate 54 is connected to the head board 20 via a spring, and has the function of absorbing the overrun of the crank pin 50 and holding the head board 20 in its forward movement position with a constant spring tension. There is. FIG. 7 is a plan view showing details of this limiter plate 51. Guide pins 56a, 56b are implanted in the base 20a and head 20b of the head board 20, and these guide pins 56a, 56b are slidably engaged with elongated holes 55a, 55b formed in the limiter plate 54. There is. A limiter spring 58 is stretched between the arm 54a of the limiter plate 54 and the head board 20, so that the limiter plate 54 is always biased in the direction of backward movement of the head board 20. Further, the pin 5 implanted in the arm portion 54a and the chassis 19
A load canceling spring 60 is stretched between the load canceling spring 60 and the load canceling spring 60. As will be described later, this cancellation spring 60 has the function of reducing the force of the pinch pressure spring 48 applied to the head board 20, thereby reducing the load on the control motor 49. The head portion 54b of the limiter plate 54 has U-shaped hook portions 54a, 54 that engage with the crank pin 50.
d is formed. When the crank pin 50 is rotated to the REC position or the PLAY position shown in FIG. 7 during recording or reproduction, the limiter plate 54 is moved in the forward direction together with the head board 20. FIG. 8 is a plan view showing the forward movement of the head board 20 and the limiter plate 54. When the head board 20 is in the backward movement position shown in FIG. 5, the head board 20 is biased in the forward movement direction by the pinch pressure spring 48 as described above. and crank pin 50
clockwise (PLAY) or counterclockwise (REC)
The head board 20 and the limiter plate 54 are moved forward as the motor rotates, and are moved backward when stopped. At this time, the crank pin 50 is
A force in the opposite direction to the force of the pinch pressure spring 48 applied to the head board 20 is applied to the head board 20 via the guide pins 56a, 56b of the head board 20 by a canceling spring 60 stretched between the limiter plate 54 and the chassis 19. Added. Similarly, the force of the pinch pressure spring 48 applied to the limiter plate 54 via the guide pins 56a, 56b of the head board 20 is
deducted by. As a result, crank pin 5
The lateral pressure on the head board 20 and the limiter plate 54 that is applied as a load to the head board 20 becomes extremely small during both forward and backward movement, and even a small, low torque control motor 49 can easily move the head board 20 back and forth. be. Note that the head board 20 is connected by the crank pin 50.
Since the limiter plate 54 and the limiter plate 54 are moved integrally,
The limiter spring 58 stretched between the head board 20 and the limiter plate 54 does not become a load on the motor 49. When the head board 20 advances a certain distance in the forward movement direction, the pinch roller 14 comes into contact with the capstan 12 as shown in FIG. In this state, the pinch roller lever 22 is separated from the head substrate 20, and the pressing force exerted by the pinch pressure spring 48 is eliminated. Therefore, thereafter, the limiter plate 54, which is moved forward by the crank pin 50, pulls the head board 20 in the forward direction via the limiter spring 58. At this time, the load applied to the crank pin 50 is the tension of the canceling spring 60 applied to the limiter plate 54.
Since the moment of the crank pin 50 is in the backward motion direction, the control motor 49 will not be overloaded. Guide pin 41 embedded in head board 20
However, as shown in Fig. 8, the guide notch 4 of the chassis 19
2, the forward movement position of the head board 20 is determined. On the other hand, the limiter plate 54 is
It is further advanced from the position indicated by the dashed line 54x in the figure to the position indicated by the solid line. The tension of the limiter spring 58 generated at this time holds the head board 20 in its forward movement position. When the crank pin 50 moves back from the playback (PLAY) or record (REC) position to the stop mode position, the canceling spring 60 and the limiter spring 58 move the limiter plate 5 in the backward movement direction of the crankpin 50, respectively.
4, the starting torque of the control motor 49 may be small. In addition, the force required to resist the pinch pressure spring 48 during the backward movement of the head board 20 is
As in the forward movement, it is subtracted by the canceling spring 60,
The load on the control motor 49 is significantly reduced. The arm portion 20e of the head board 20 is provided with a bent portion 62 of an idler lever 62, which rotatably holds the idler 34 with a shaft 63, as shown in FIG.
a is engaged. This idler lever 62
is rotatably supported by a support shaft 64 installed in the chassis 19, and biased clockwise by a spring 61. When the head board 20 moves forward to the forward position, the arm part 20e of the head board 20 disengages from the bent part 62a of the idler lever 62, and
The idler lever 62 rotates clockwise. This causes the idler 34 to
The take-up reel 10 is frictionally engaged with the drive wheel 32 coaxial with the take-up reel stand 33, and the take-up reel 10 is rotated in the tape winding direction. FIG. 9 shows the operating state of the main parts in the reproducing state, and FIG. 10 is a side view of the capstan and take-up reel portion as seen from the direction of the arrow in FIG. During playback, the crank pin 50 is rotated approximately 90 degrees clockwise by the control motor 49, and the head board 20 is moved forward as explained in FIG.
is advanced to the tape contact position. Further, the pinch roller 14 is pressed against the capstan 12, and the tape is run. In addition, as shown in FIG.
and the take-up reel stand 33, and the take-up reel 1
0 is rotated in the direction of arrow PLAY in FIG. 9, and the tape is wound up. Note that since this regeneration mode or other operating modes are switched by the control motor and worm gear system, no device is required to lock the drive mechanism in each mode. This is because the worm gear system is not driven by the load on the crank pin 50 unless the control motor operates. Next, I will explain the recording mode (REC).
In this mode, the forward movement of the head board 20 and the drive of the take-up reel are the same as in the reproduction mode.
As shown in FIG. 4, the head board 20 and chassis 1
A recording lever 65 is disposed between the recorder 9 and the recorder 9, and in the recording mode, the erase head 15 and the recording/reproducing switch 70 are operated by the recording lever 65. FIG. 11 is a plan view showing details of the recording lever 65 in the stop mode position. The recording lever 65 is rotatably supported by a support shaft 67 installed in the chassis 19, and a cam portion 65a that engages with the crank pin 50 is formed on the driving side thereof. The cam portion 65a has a curved portion 65b and a straight portion 65c,
The curved portion 65b has the same radius as the maximum rotation radius of the crank pin 50. Therefore, when the crank pin 50 is rotated clockwise during reproduction, the recording lever 65 is not operated. Further, when the crank pin 50 is rotated counterclockwise during recording, the straight portion 65c of the cam portion 65a is pushed by the crank pin 50, and the recording lever 65 is rotated clockwise. The tip 65d on the working side of the recording lever 65 is engaged with the working pin 25a of the erasing head lever 25 that rotatably supports the erasing head 15, and as shown in FIG.
5 is pivotally biased to a non-operative position. A spring 68 is stretched between the working pin 25a and a bent portion 65e formed at the tip 65d of the recording lever 65. Further, a claw portion 69 is attached to the active side of the recording lever 65, and a recording/reproduction changeover switch 70 is fixed to the claw portion 69 and a circuit board (not shown).
The knob 71 is engaged. Figure 12 shows the recording lever 65 in recording mode.
shows the operation. As explained in Figure 8,
During recording, the crank pin 50 is rotated approximately 90 degrees counterclockwise by the control motor 49, the head board 20 is advanced to the forward position, and the take-up reel 10 is rotated in the winding direction via the idler 34. rotated to At the same time, the recording lever 65 is moved to the crank pin 5.
0, it is rotated clockwise around the support shaft 67. As a result, the tip 65d of the recording lever 65
The erasing head lever 25 is disengaged from the working pin 25a, and the erasing head lever 25 is pulled by the spring 68 and rotated clockwise. The erase head lever 25 rests against one end of the chassis 19, and the tension of the spring 68 holds the erase head 15 in the operating position shown in FIG. Also the first
In the operating position of the recording lever 65 shown in FIG. 2, the knob 71 of the recording/reproducing switch 70 is slid to the recording side by the claw portion 69 attached to the recording lever 65, and the recording circuit is put into an operating state. When moving back from the recording mode to the stop mode, the side end 20f of the head board 20 is engaged with the working pin 25a of the erasing head lever 25, and as the head board 20 moves back, the erasing head lever 25 is pushed back. Further, the recording lever 65 is moved counterclockwise by the return movement of the crank pin 50 to the stop mode position, thereby switching the knob 71 of the recording/reproducing switch 70 to the reproduction side. Next, the fast forward mode will be explained. In this mode, as explained in FIG. It is rotated at high speed in the direction of taking. As shown in FIG. 4, the reversing flywheel 29 is rotatably supported by a fast-forwarding lever 72, and the above-mentioned gears 35 and 37 are connected by this fast-forwarding lever 72. FIG. 13 is a plan view showing details of the fast-forwarding lever section, FIG. 14 is a plan view of its operating state, and FIG. 15 is a partial side view as seen from the direction of the arrow in FIG. 14. As shown in FIGS. 13 and 15, the fast-forwarding lever 72 is rotatably supported on a support shaft 73 implanted in the chassis 19, and the operating end of this lever is provided with a shaft 73.
4, a reversing flywheel 29 is rotatably attached. Drive end 7 of rapid-forward lever 72
2a is formed with a circular arc edge 72b, and the second crank pin 75 is engaged with this edge 72b. Also, the drive end 72a of the fast-forwarding lever 72
A spring 77 is stretched between the bent portion 72c formed in the chassis 19 and the pin 76 implanted in the chassis 19, and the tension of the spring 77 causes the fast-forward lever 7 to move.
2 is biased to rotate counterclockwise. The second crank pin 75 is moved in a reciprocating arc by a second control motor 78 shown in FIGS. 4 and 6, thereby switching the fast forward (FF) and rewind (REW) gears. It will be done. The fast forward mode is when the crank pin 75 is rotated approximately 90 degrees clockwise from the stop mode position shown in Figure 4, and the rewind mode is when the crank pin 75 is rotated approximately 90 degrees counterclockwise from the stop mode position. It is. As shown in the detailed view of the control motor board in FIG. 6, the crank pin 75 is eccentrically attached to a gear 79, and this gear 79 is fitted onto the shaft of the control motor 78 via an intermediate gear 80 and a worm gear 81. The worm 78a is driven by the worm 78a. When the crank pin 75 is rotated clockwise to the fast forward position (FF) as shown in FIG. and rotated counterclockwise. In this state, the 14th
As shown in Fig. 15, the inverted flywheel 2
A gear 35 coaxial with the take-up reel 10 is meshed with a gear 37 coaxial with the take-up reel 10, and the take-up reel 10 is rotated at high speed in the direction of arrow FF in FIG. 14 to rapidly advance the tape. In addition, when in rewind mode, crank pin 7
5 is rotated to the rewind mode position (REW) in FIG.
The fast forward lever 72 is not activated. Next, the rewind mode will be explained. In this mode, as explained in FIG.
is meshed with a gear 39 coaxial with the reversing flywheel 29 and a gear 40 coaxial with the supply reel 11 .
In order to operate this intermediate gear 38, a rewind lever 84 is disposed in engagement with a crank pin 75, as shown in FIG. FIG. 16 is a plan view showing details of the rewind lever 84, FIG. 17 is a plan view of its operating state, and FIG.
The figure is a partial side view seen from the direction of the arrow in FIG. 17. As shown in FIGS. 16 and 18, the rewinding lever 84 is rotatably supported on a support shaft 85 installed in the chassis 19, and the intermediate gear 38 is connected to the operating end of the lever via a shaft 86. is rotatably mounted. An arcuate edge 84b is formed on the drive end 84a of the rewind lever 84.
b is engaged with the already mentioned second crank pin 75. Also, the drive end 84a of the rewind lever 84
A spring 88 is stretched between the bent portion 84c formed on the chassis 19 and the pin 87 implanted in the chassis 19, and the tension of the spring 88 causes the rewinding lever 8 to be
4 is biased to rotate counterclockwise. As shown in FIG. 17, when the crank pin 75 is rotated counterclockwise to the rewind position (REW),
The locking portion 84d of the rewind lever 84 is connected to the chassis 19.
The rewind lever 84 is rotated counterclockwise by the spring 88 until it comes into contact with a stopper pin 89 installed in the rewind lever 84 . In this state, as shown in FIGS. 17 and 18, the intermediate gear 38 is meshed with a gear 39 coaxial with the reversing flywheel 29 and a gear 40 coaxial with the supply reel 11. Therefore, the 17th
The supply reel 11 is rotated at high speed in the direction of the arrow REW in the figure, and the tape is rewound. In addition, when in fast forward mode, crank pin 7
5 is rotated to the fast forward mode position (FF) shown in FIG.
4, the rewind lever 84 is not activated. Next, queue (fast forward) and review (rewind) during playback will be explained. These modes are
During playback, press rewind button 4 or fast forward button 5 in Figure 1.
This is done when you operate . When these buttons 4 or 5 are operated, the control motor 49 is operated, and the crank pin 50 is temporarily returned to the stop position from the playback mode position (PLAY) in FIG. 9, and then rotated to the playback mode position again. Along with this, head board 2
0 is moved backward once and then moved forward again. At this time, the fourth
A stop lever 91 shown in the figure acts to prevent the head substrate 20 from moving forward during its forward movement. Next, in this state, the control motor 78 is operated, and the mode is switched to the fast forward mode shown in FIG. 14 or the rewind mode shown in FIG. 17, and cue or review is performed. As shown in FIG. 4, the stop lever 91 is rotatably supported by a support shaft 92 installed in the chassis 19, and is rotated counterclockwise by a spring 93 stretched between it and the chassis 19. It is rotationally biased. A stop pin 94 that engages with the arm portion 20e of the head board 20 is fixed to the operating end 91a of the stop lever 91. Also, stop lever 9
An iron piece 96, which is attracted by a solenoid 95, is fixed to the operating end 91b of 1. During playback or recording, the solenoid 95 is not energized, so when the head board 20 moves forward, the arm 2
The inclined edge 20g of 0e hits the stop pin 94 of the stop lever 91, and the stop lever 91
is released clockwise as shown in the reproduction mode diagram of FIG. Therefore, the forward movement of the head board 20 is not blocked midway. FIGS. 19 and 20 are plan views showing the operation modes during queue and review, respectively. In these modes, the head board 20 once retreats and moves forward again as described above, but at this time the solenoid 95
is energized, and the operating end 91b of the stop lever 91
The iron piece 96 attached to is attracted. Therefore, the inclined edge 20d of the arm portion 20e of the head board 20
When the stop pin 94 hits, the forward movement of the head board 20 is stopped midway as shown in FIG. 19 or 20. In this state, the pinch roller 14 is not pressed against the capstan 12. Further, the limiter plate 54 slides relative to the head board 20 and advances independently to the forward movement position. Therefore, no extra load is applied to the crank pin 50. In this state, the control motor 78 is then driven,
When the crank pin 75 is rotated to the fast forward mode position (FF) as shown in FIG. 19 or to the rewind mode position (REW) as shown in FIG. Fast forward or rewind to queue or review. When the play button 2 is operated again during queue or review, the solenoid 95 is turned off. Then, the stop lever 91 becomes ready to rotate.
The stop pin 94 slides off the sloped edge 20g of the head board 20, and the head board 20 is advanced to the forward position shown in FIG. At the same time, the control motor 78 operates, the crank pin 75 returns to the stop mode position, and the tape running system returns to the playback mode. By adjusting the mounting position of the solenoid 95 on the chassis 19, the amount of protrusion of the head 13 during queue and review can be adjusted. That is, depending on the mounting position of the solenoid 95, the contact position of the stop pin 94 with respect to the inclined edge 20g formed on the arm portion 20e of the head board 20 changes, thereby making it possible to change the amount of protrusion of the head 13. . Next, FIG. 21 is a schematic plan view showing essential parts of the tape drive system, and FIG. 22 is a schematic cross-sectional view taken along the - line in FIG. 21. As mentioned above, in the cassette recorder of this embodiment, the capstan flywheel 3
1 and an inverted flywheel 29 are used to obtain an anti-rolling effect. Also, inverted flywheel 3
Gears 35 and 39 are coaxially attached to the take-up reel 10 and are configured to mesh with a gear 37 or an intermediate gear 38 coaxial with the take-up reel 10 to perform fast forwarding or rewinding. This is extremely advantageous in terms of space factor and number of parts.
The structure is suitable for compactness. To explain this in comparison with the schematic plan view of a conventional tape drive system shown in FIG.
A belt 99 was wound around the capstan flywheel 98, and a reversing flywheel 101 was disposed between the motor 100 and the capstan flywheel 98, and the belt 99 was in contact with a part of its circumferential surface. The axis of the reversing flywheel 101 is fixed,
A pulley 103 and a reversing flywheel 10 are pressed against and separated from the take-up reel stand 102 for rapid feed.
Another belt 105 is connected between the pulley 104 of
An idler 106 was arranged between the reversing flywheel 101 and the supply reel stand 107 so as to be connected to and separated from the reversing flywheel 101 and the supply reel stand 107 for winding and rewinding. On the other hand, in this embodiment, as shown in FIG.
is wrapped around it. This structure has more freedom in the position of the inverted flywheel 29 than in FIG.
If the reversing flywheel 29 is attached to the fast-forwarding lever 72 to make it movable as in the embodiment, and the gears 35 and 39 are attached to the flywheel 29, the intermediate pulley 103 as shown in FIG. 23 can be eliminated. However, rapid traverse operation can be performed by gear coupling, which simplifies the structure and improves the space factor. Note that when the winding angle of the belt 30 around the capstan flywheel 31 is 90 degrees or less as in this embodiment shown in FIG. 21, the frictional force between the flywheel 31 and the belt 30 becomes small, causing As a result, the driving force of the motor 27 may not be reliably transmitted to the flywheel 31. In this case, the rotational speed of the flywheel 31 changes due to slight fluctuations in the load torque while the tape is running, making the tape running unstable and causing wow.
Flattery worsens. Therefore, as shown in FIG. 22, when the angle of the contact side of the belt 30 (square belt) is 90 degrees, the opening angle of the V groove 29a of the inverted flywheel 29 is about 90 degrees, and on the other hand, the capstan flywheel V of foil 31
The opening angle of the groove 31a is approximately 70 degrees. With this, the V groove 3 of the capstan flywheel 31
The belt 30 bites into 1a better,
Even if the belt winding angle is small, the flywheel 31
The driving force of the motor can be increased, slips can be prevented, and wow and flutter can be reduced. Next, detection and control of the rotational positions of the crank pins 50, 75 shown in FIG. 6 will be explained. 24th
The figure is a sectional view taken along the - line in Figure 6, and the 25th
The figure is a bottom view of the gear 51 including the crank pin 50. As shown in FIG. 24, the final stage gear 51 is rotatably supported by a shaft 109 implanted in the control motor board 108, and a crank pin 50 is attached to a boss 51a at an eccentric position.
0 is fitted with a sliding ring 50a. gear 51
As shown in FIG. 25, a contact member 110 made of phosphor bronze or the like and having three brushes 110a to 110c is fixed to the bottom surface of the contact member 110, as shown in FIG. The substrate 108 is a soft iron plate with a resin layer pasted or coated thereon, and is used as a mechanical structural member (chassis) and a yoke for the motors 49 and 78. On the surface of the resin layer, there is a contact pattern copper foil 1 for detecting the rotational position of the crank pins 50 and 75.
11. Output lead wires for each contact pattern, motor power lines, etc. are printed and wired. FIG. 26 is a partial plan view showing the main part of the contact pattern copper foil 111 formed on the control motor board 108. The contact pattern copper foil 111 includes common ground patterns 112, 113 and an output pattern 114.
A to 114E, a common ground pattern 112 and output patterns 114A to 114C are arranged concentrically with respect to the axis 109 of the gear 51, and a common ground pattern 113 and an output pattern are arranged concentrically with respect to the axis 115 of the gear 79. 114D, 114
E is placed. The common ground pattern 112 is the crank pin 50
Position detection contact pattern 112C- corresponding to the stop mode position (STOP), playback mode position (PLAY), and recording mode position (REC) of
STOP, 112A-PLAY, and 112B-REC, and the common ground pattern 113 corresponds to the stop mode position (STOP), fast forward mode position (FF), and rewind mode position (REC) of the crank pin 75. Position detection contact pattern 113C
-STOP, 113D-FF, 113-REW. Note that the positions of the contact members on the back surface of the gear 79 are set so that each stop position of the crank pin 75 corresponds to the mechanical position of the contact patterns 113C to 113E. When the potential of the common ground patterns 112 and 113 in FIG. 25 is set to logic "0", the output codes (A to E) of the output patterns 114A to 114E at each detection angle position are as shown in the table below.

[Table] Next, FIG. 27 shows a control circuit diagram of the control motors 49, 78 and the drive motor 27. Figure 25, 2nd
The structure of the position detection switch shown in FIG. 6 is equivalent to the switch circuits 117 and 118 shown in FIG.
E is the fixed contact side, and the fixed contact side has PLAY,
It can be thought of as a changeover switch with contact patterns of STOP, REC, FF, STOP, and REW, respectively. The output codes A to E shown in the table above are based on the rotation angle of each contact pattern (contact pattern 112A in Fig. 25).
112C and 113C to 113E) and supplied to the control logic IC 119. The control logic IC 119 determines the positions of the crank pins 50 and 75 when the keys are operated according to the inputs from the operation keys 1 to 5 and the position detection codes A to E shown in FIG. 78
(forward rotation or reverse rotation), and when the target rotational position is detected, control signals S ₁ and S ₂ are generated to stop the control motor 49 or 78. Further, in synchronization with the stoppage of these control motors 49 and 78, a signal _S3 for driving the capstan drive motor 27 is supplied to the servo circuit 120. Also the control logic
By control signal _S4 of IC119, solenoid 9
It is energized when 5 is queued or reviewed. The switch 16 inserted into the ground line 121 in FIG. 27 is turned on and off in conjunction with the opening and closing operations of the cassette lid 7, as shown in FIG. 1, and the switch 16 is turned on only when the cassette lid 7 is closed. The control logic IC 119 is configured to be energized at this time. Since the control logic IC 119 does not operate when the cassette lid 7 is open when loading or unloading the cassette, the tape running system or mode switching mechanism will not be activated even if operation buttons 1 to 5 are erroneously operated. Damage to the internal mechanism of the recorder can be prevented. Next, FIG. 28 shows an operation time chart of the control motor and the capstan drive motor. Since the tape recorder of this embodiment is mainly used with a built-in battery, the control motors 49, 78 and the capstan drive motor 27 are not operated at the same time to prevent voltage reduction. In the reproduction mode, first, as shown in FIG. 28A, a control signal _S1 is generated from the control logic IC 119,
The control motor 49 rotates normally, and the crank pin 50 rotates clockwise to enter the regeneration mode. Next, a control signal _S3 is generated, and the drive motor 27 is driven to perform a regeneration operation. When returning from the regeneration mode to the stop mode, the drive motor 27 is first stopped as shown in FIG. 27, and then the control motor 49 is reversed and the crank pin 50 is returned to the stop mode position. In the recording mode, the control motor 49 rotates forward and backward in the opposite direction as in the reproduction mode, as indicated by the dotted line in FIG. 28A. In the fast forward mode, as shown in FIG. 28B, the motor 78 is first rotated in the normal direction by the control signal _S2 .
After the crank pin 75 rotates clockwise to enter the fast-forward mode, the drive motor 27 operates to perform fast-forwarding of the tape. When returning from the fast forward mode to the stop mode, the drive motor 27 is stopped, the control motor 78 is reversed, and the crank pin 75 is returned to the stop mode position. In the rewind mode, the control motor 78 rotates forward and backward in the opposite direction as in the fast forward mode, as indicated by the dotted line in FIG. 28B. In the case of queue or review in the playback mode, the control motor 49 is first reversed by the control signal _S1 as shown in FIG. 28C, and the crank pin 50
is returned to the stop mode position. At this time, the control signal
By _S4 , the solenoid 95 is turned on, and the control motor 49 is further rotated in the normal direction, so that the head board 20 is set at the queue and review positions. Then the control signal S ₂
The control motor 48 rotates forward (when in queue).
Alternatively, the drive motor 27 is turned on after being reversed (at the time of review) to enter the fast forward or rewind mode, and the cue or review is performed.
When returning to the playback mode, first the drive motor 27 is turned off and the solenoid 95 is turned off, as shown in FIG. 28C, and the head board 20 is returned to the playback mode position (forward movement state). At the same time, the control motor 78 is rotated in the reverse or forward direction, and the crank pin 75 is returned to the stop mode position. Next, the drive motor 27 is turned on and the regeneration operation is performed again. In this way, when switching between each mode, the control motor 4
9, 78 and the drive motor 27 are not driven at the same time, and can be operated satisfactorily even with a built-in 3V battery, for example. As described above, in the present invention, the pinch pressure spring 48 biases the pinch roller 14 toward the capstan 12 and also biases the head board 20 in the forward movement direction, thereby moving the limiter plate 54 against the head board 20 in the forward movement direction. The control motor 49 is mounted so as to be slidable in the direction of movement.
Therefore, the limiter plate 54 is moved more than the head board 20, and the limiter spring 58 is stretched between the limiter plate and the head board, and the pinch plate 54 is placed between the limiter plate 54 and the chassis 19. A canceling spring 60 that acts in a direction to cancel the biasing force exerted by the pressure spring 48 is provided. Therefore, according to the present invention, the load caused by the reciprocating movement of the head board and limiter plate by the control motor 49 is greatly reduced by the canceling spring 60, and it is possible to drive the motor with a small size, low torque, and even with a small capacity battery. This allows the tape recorder/player to be made more compact.

[Brief explanation of drawings]

Fig. 1 is a perspective view of a cassette tape recorder to which the present invention is applied with the cassette lid open, Fig. 2 is a plan view of the cassette mounting section of Fig. 1 with a cassette tape attached, and Fig. 3 is a perspective view of the cassette tape recorder to which the present invention is applied. FIG. 4 is a plan view showing the head board drive mechanism and mode switching mechanism; FIG. 5 is a plan view showing the head board in FIG. 4; FIG. 6 is a plan view showing the control motor and worm gear section. A top view of the control motor board showing the
7 is a plan view of the limiter plate in FIG. 4, FIG. 8 is a plan view showing the forward movement state of the head board and limiter plate, FIG. 9 is a plan view showing the operating state of the main parts in the reproducing state, and FIG. FIG. 10 is a side view of the capstan section and take-up reel section as seen from the arrow in FIG. 9, FIG. 11 is a plan view of the recording lever in the stop mode position, and FIG. 12 is a plan view showing the recording lever in the recording mode position. , FIG. 13 is a plan view of the fast-forward lever section, FIG. 14 is a plan view showing the operation of the fast-forward lever, and FIG. 15 is a plan view of the fast-forward lever section.
FIG. 16 is a plan view of the rewind lever section, FIG. 17 is a plan view showing the operation of the rewind lever, and FIG. 18 is a side view of the main parts seen from the arrow in FIG. 17. 19 is a plan view showing the operation of each part in the queue mode; FIG. 20 is a plan view showing the operation of each part in the review mode;
21 is a schematic plan view showing the main parts of the tape drive system shown in FIG. 3, FIG. 22 is a sectional view taken along the - line in FIG. 21, and FIG. 23 is a conventional example of the tape drive system. 24 is a sectional view taken along the - line in FIG. 6, FIG. 25 is a bottom view of the gear equipped with the crank pin, and FIG. 26 is a copper contact pattern formed on the control motor board. FIG. 27 is a partial plan view showing the main parts of the foil, FIG. 27 is a control circuit diagram of the control motor and drive motor, and FIG. 28 is an operation time chart of the control motor and capstan drive motor. In addition, in the symbols used in the drawings, 12...capstan, 13...recording/playback head,
20... head board, 22... pinch roller lever, 48... pinch pressure spring, 49... control motor, 54... limiter plate, 58... limiter spring, 60... canceling spring.

Claims (1)

[Claims] 1. In a tape recorder/player in which a control motor is rotated in the forward and reverse directions to reciprocate a head board holding a head between an operating position and a non-operating position, the pinch roller is urged toward the capstan and the pinch roller lever is a pinch pressure spring that biases the head board in the reciprocating direction when the head board is engaged; A limiter plate that is moved beyond the movement range, a limiter spring that is stretched between the head board and the limiter plate, and a biasing force of the pinch pressure spring that is stretched between the limiter plate and the chassis are counteracted. A tape recorder or player comprising a canceling spring that acts in the erasing direction.