JP2542925B2 - Magnetic recording / playback device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a magnetic recording / reproducing apparatus that switches the running mode of a tape by an electric signal.

(B) Conventional technology Conventionally, a magnetic recording / reproducing apparatus for controlling the running mode of a tape by switching the rotation direction of a motor by an electric signal as disclosed in, for example, Japanese Patent Laid-Open No. 59-42659, uses a magnetic solenoid. The head substrate was moving.

(C) Problems to be Solved by the Invention However, when the magnetic solenoid is used in this way, the device becomes large and a large instantaneous current is required.

(D) Means for Solving the Problems In the magnetic recording / reproducing apparatus of the present invention, in the process in which the planet gear moves from one reel shaft gear to the other reel shaft gear, the rotation set by meshing with the planet gear is set. It has a control gear provided with a cam for changing the position of the head substrate according to the position.

(E) Operation The present invention is configured as described above, and controls the rotation direction of the motor by the control means to move the planetary gears in a predetermined direction, thereby arranging the head substrate at a predetermined position. One of each reel shaft can be rotated.

(F) Embodiment (First Embodiment) FIG. 1 is a schematic plan view of a magnetic recording / reproducing apparatus according to a first embodiment of the present invention, and FIG. 2 is a portion taken along the line AA 'in FIG. A sectional view is shown. (10) is a main board, (20) and (30) are reel shafts, which are pivotally supported by the main board (10). (2
Reference numerals 1) and (31) are reel shaft gears that are coaxially pressed against and superimposed on the reel shafts (20) and (30) via a friction material (not shown) such as felt. (40) is the capstan shaft,
The bearing portion (50) fixed to the main substrate (10) is rotatably provided. Reference numeral (60) denotes a head substrate on which the pinch roller (70), the reproducing magnetic head (80) and the erasing magnetic head (90) which can be engaged with and released from the capstan shaft (40) are mounted. The downward bending claws (61) (11) provided on each of the main boards (10) are used as sliding guide claws. The bending claws (61) (11) allow the head substrate (10) to slide in the left-right direction (the AA 'axis direction) on the upper portion of the main substrate (10). The head substrate (60) also has a guide piece (62) which is inserted into the through hole (12) formed in the main substrate (10). The through hole (12) has a length corresponding to the sliding distance of the head substrate (60). Reference numeral (100) is a spring which is arranged between the head substrate (60) and the main substrate (10) and biases the head substrate (60) to the left in FIG. Reference numeral (110) is a flywheel fixed to the lower end of the capstan shaft (40) below the main substrate (10), and a drive gear (120) is coaxially fixed to the upper surface of the flywheel. (130) is a motor (14) fixed to the main board (10)
Reference numeral 0) is a motor pulley fixed to the shaft of the motor and is connected to the flywheel (110) through an endless belt (150). (160) is the main board (10) and drive gear (120)
A rotary plate rotatably mounted on a flange (51) provided on the bearing (50) between the contact parts (161) (162) extending to both sides at one end, and the other end. The engaging projection (16
3) is provided. The engaging projection (163) is formed by bending the other end of the rotary plate (160) downward as shown in FIG. Reference numeral (170) denotes an internal gear that is rotatably arranged in the bearing portion (50) between the main substrate (10) and the rotary plate (160), and has a fan-shaped internal tooth portion (171) at the bottom. ,
Steps (172) and (173) are formed on both ends of the internal tooth portion, and a cam (174) is formed on the upper portion. As shown in FIG. 3, the cam comprises a large diameter portion (174A), a small diameter portion (174B) and a recess (174C), a part of which is exposed from the throwing hole (12) of the main substrate (10). The head substrate (60) is set so as to come into contact with the guide piece (62). As a result, the cam (174) moves the head substrate (60) in the left-right direction in FIG. 1 against the biasing force of the spring (100) in response to the rotation of the internal gear (170). Reference numeral (180) is a planetary gear that is always meshed with the drive gear (120) and meshed with the internal tooth portion (171) of the internal gear (170) according to the rotation of the rotary plate (160). This planetary gear (180) has a rotating plate (16
The washer (20) to the shaft (190) fixed to the lower surface of one end of (0).
It is rotatably provided via a spring (210) and is pressed against the rotating plate (160). When the drive gear (120) rotates, the rotary plate (160) is given a force that rotates in the same direction as the rotation direction of the drive gear (120) by this pressure contact force.

Reference numerals (220) and (230) are support plates formed by notching the main substrate (10) and bending it downward. The left support plate (220) has abutting portions (161) (16) of the rotary plate (160) so that the rotary plate (160) and the internal gear (170) do not rotate more than a predetermined position.
2) and the stepped portions (172) (173) of the internal gear (170) are arranged so as to be capable of contacting each other. (240) is the support plate (220)
In FIG. 1, stopper plates provided in (230) so as to be movable in the left-right direction are provided with tapers (241) (242) on both left-hand sides, which abut the engaging projections (163) of the rotating plate (160). There is. (250) is a spring which is arranged between the support plate (220) and the stopper plate (240) and biases the stopper plate to the left side in FIG. 1, and the biasing force is set to be larger than that of the spring (100). ing.

FIG. 5 is a block diagram. (260) is a command circuit for commanding each mode of stop, play, fast forward, rewind and high speed erasing, and (270) is a control circuit which operates based on the output of the command circuit. The motor (130) is rotated in the normal and reverse directions and the speed of the motor (130) is controlled at a predetermined time timing when switching to each mode.

Next, the operation of the first embodiment will be described with reference to FIGS. 1 and 6 to 14. Incidentally, FIG. 15 shows the relationship between FIG. 1 and FIGS. 6 to 14 corresponding to the switching to each mode, which will be described with reference to this figure. In Figure 15,
“Clock” and “counterclock” indicate the direction of rotation of the motor (130) in FIG. First, the switching from the stop mode to the reproduction mode will be described. Here, the stop mode refers to the following state, as shown in FIG.

The guide piece (62) of the head substrate (60) is pushed by the biasing force of the spring (100) into the recess (17) of the cam (174) of the internal gear (170).
Located within 4C).

The head substrate (60) is located on the leftmost side, and the tape is completely separated from the pinch roller (70), the capstan shaft (40), each magnetic head (80) (90), and the tape. The engagement protrusion (163) of the rotary plate (160) is in contact with one taper (241) of the stopper plate (240).

In the state of FIG. 6, when a reproduction command signal is given from the command circuit (260) to the control circuit (270), the control circuit (270) rotates the motor (130) clockwise in FIG. As a result, the flywheel (110) and the drive gear (120) also rotate clockwise. The rotary plate (160) tries to rotate clockwise by the clockwise rotation of the drive gear (120), but stops in that state. This is because the engaging protrusion (163) is in contact with the stopper plate (240). In this state, the rotational force of the drive gear (120) is transmitted to the internal tooth portion (171) of the internal gear (170) via the planetary gear (180), and the internal gear (170) moves counterclockwise. Rotate in the direction. This is the spring (10
0) The force that blocks the rotation of the rotary plate (160) due to the biasing force of the spring (250) via the stopper plate (240) is greater than the force that blocks the rotation of the internal gear (170) due to the biasing force. This is because the larger one is set. This internal gear (17
0) rotates and the step (173) turns into the support plate (220) as shown in FIG.
When it comes into contact with the cam (17) of the internal gear (170),
The guide piece (62) of the head substrate (60) moves to the rightmost side by the large diameter portion (17A) of 4). Therefore, the pinch roller (70) and the capstan shaft (40) hold the tape, and the reproducing magnetic head (80) contacts the tape. The biasing force of the guide piece (62) on the cam (174) acts to rotate the internal gear (170) counterclockwise due to the shape of the cam (174). 170) will stop.

In the above state, the internal gear (170) does not rotate any further in the counterclockwise direction, so that the rotary plate (160) engages with the engaging protrusion (1
While rotating the stopper plate (240) to the right against the urging force of the spring (250) by 63), it rotates clockwise as shown in FIG. Then, the rotating plate (160) further rotates until its contact portion (162) contacts the support plate (220), and the planetary gear (180) is moved to one reel shaft gear (2) as shown in FIG.
It will be engaged with 1). In the state shown in FIG. 1, the rotational force of the motor (130) passes through the flywheel (110), the drive gear (120) and the planet gear (180), and the reel shaft gear (2
1) will be transmitted to the device, the playback head (80)
Playback mode to read the information on the tape.

Next, switching from the reproduction mode to the stop mode will be described. When a stop command signal is given from the command circuit (260) to the control circuit (270) in the state of FIG. 1, this control circuit (270) rotates the motor (130) counterclockwise. As a result, as shown in FIG. 8, the rotation plate (160) has the engagement projection (163) with the taper (242) of the stopper plate (240).
Rotate counterclockwise until it touches. When the engagement protrusion (163) comes into contact with the taper (242), the planet gear (180) and the internal tooth portion (171) of the internal gear (170) have already meshed. Therefore, the rotational force of the drive gear (120) is
Internal teeth (17) of the internal gear (170) through the planetary gear (180)
1) and the internal gear (170) rotates clockwise. As the rotation of the internal gear (170) progresses, the state shown in FIG. 9 is passed and then the internal gear (17
When the stepped portion (172) of (0) abuts on the support plate (220), the rotary plate (160) causes the engagement protrusion (163) to rotate the spring (250) in the same manner as in the conditions of FIGS. 7 to 8. ), The stopper plate (240) is moved to the right and rotated counterclockwise. Then, as shown in FIG. 12, when the engaging projection (163) of the rotary plate (160) comes into contact with the taper (241) of the stopper plate (240), the control circuit (270) causes the motor (13) to move.
Rotate 0) clockwise. In this state, the rotating plate (16
0) does not rotate, so the rotational force of the drive gear (120) is transmitted through the planetary gear (180) to the internal gear (171) of the internal gear (170).
The internal gear (170) rotates counterclockwise. Then, when the rotation of the internal gear (170) progresses and reaches the state of FIG. 6 described above, the control circuit (270) stops the rotation of the motor (130) and the apparatus enters the stop mode.

Next, switching from the stop mode to the fast-forward mode will be described. When a fast-forward command signal is given from the command circuit (260) to the control circuit (270) in the state of FIG. 6, this control circuit (270) rotates the motor (130) clockwise,
The state is changed from the state shown in FIG. 7 to the state shown in FIG. 8 as in the stop mode → reproduction mode. Then, in the state of FIG. 8, the control circuit (270) rotates the motor (130) counterclockwise. In this state, the rotating plate (160) does not rotate,
The rotational force of the drive gear (120) is transmitted to the internal tooth part (171) of the internal gear (170) via the planetary gear (180), and the internal gear (170) rotates clockwise. It will be. When the rotation of the internal gear (170) progresses to the state shown in FIG. 9, the pinch roller (70), the capstan shaft (40), and the respective magnetic heads (80) ( 90) and the tape are completely separated. After this,
The control circuit (270) rotates the motor (130) clockwise. Thus, the engaging protrusion (163) is provided on the rotating plate (160).
Since the rotational force is applied in the direction in which the engagement between the stopper plate (240) and the taper (242) of the stopper plate (240) is released, this rotating plate (16
0) rotates clockwise. When the rotary plate (160) rotates in the clockwise direction, the internal gear (170) has a planetary gear (18).
A counterclockwise rotational force can be applied from (0), but the internal gear (1) is rotated by the biasing force of the guide piece (62) against the cam (174).
The force to stop 70) remains large.

Thus, the rotating plate (160) rotates until its contact portion (162) contacts the support plate (220) as shown in FIG. Then, when the planet gear (180) meshes with the reel shaft gear (21), the device enters the fast-forward mode. At this time, the control circuit (270) increases the rotation speed of the mode (130).

Next, switching from the fast-forward mode to the stop mode will be described. When a stop command signal is given from the command circuit (260) to the control circuit (270) in the state of FIG. 10, the control circuit (270) rotates the motor (130) counterclockwise. As a result, as shown in FIG. 9, the rotating plate (160) has the engagement protrusion (163) with the taper (242) of the stopper plate (240).
Rotate counterclockwise until it touches. When the engagement protrusion (163) comes into contact with the taper (242), the planetary gear (180) has already meshed with the internal tooth portion (171) of the internal gear (170). Therefore, the rotational force of the drive gear (120) is transmitted through the planetary gear (180) to the internal tooth portion (17) of the internal gear (170).
As a result, the internal gear (170) will rotate clockwise. Thus, thereafter, the apparatus is similar to the case of the reproduction mode → stop mode described above, and the apparatus shown in FIGS.
After the state shown in the figure, the state shown in FIG.

Next, switching from the stop mode to the rewind mode will be described. When a rewinding instruction signal is given from the instruction circuit (260) to the control circuit (270) in the state of FIG. 6, the control circuit (270) rotates the motor (130) counterclockwise. At this time, the engaging protrusion (163) is attached to the rotary plate (160).
Since the rotational force is applied in the direction in which the engagement between the stopper plate (240) and the taper (241) of the stopper plate (240) is applied, this rotating plate (160)
Rotates counterclockwise. In this state, as described in the stop mode → fast-forward mode, the internal gear (170)
Remains stopped, and the pinch roller (70), the capstan shaft (40), the respective magnetic heads (80) (90), and the tape are completely separated. Thus, the rotating plate (160) is the first
As shown in FIG. 3, the contact portion (161) is rotated until it contacts the support plate (220). When the planet gear (180) meshes with the reel shaft gear (31), the device enters the rewind mode. In the rewind mode as well, as in the fast-forward mode, when the planet gear (180) and the reel shaft gear (31) mesh with each other, the control circuit (270) increases the rotation speed of the motor (130).

Next, switching from the rewind mode to the stop mode will be described. When a stop command signal is given from the command circuit (260) to the control circuit (270) in the state of FIG. 13, this control circuit (270) rotates the motor (130) clockwise. This causes the rotary plate (160) to rotate clockwise.
Then, as shown in FIG. 6, when the engaging projection (163) comes into contact with the taper (241) of the stopper plate (240), the control circuit (270) stops the motor (130) and the device enters the stop mode. .

Next, switching from the stop mode to the high speed erase mode will be described. When a high speed erase command signal is given from the command circuit (260) to the control circuit (270) in the state of FIG.
The control circuit (270) rotates the motor (130) in the clockwise direction to shift the apparatus from the state of FIG. 6 to the state of FIG. 7 to the state of FIG. 8 in the same manner as the stop mode → reproduction mode. In the state shown in FIG. 8, the control circuit (270) rotates the motor (130) in the counterclockwise direction, and the device goes through the states shown in FIGS. 9 and 11 in the same manner as the playback mode → stop mode. Transition to the state shown in FIG. Then, the control circuit (270) further rotates the motor (130) counterclockwise in the state shown in FIG. This allows the rotating plate (160)
As shown in FIG. 14, the abutment portion (161) is attached to the support plate (220).
The planetary gear (180) meshes with the reel shaft gear (31). Thus, in the state of FIG. 14, the small diameter portion (174B) of the cam (174) of the internal gear (170) makes the moving distance to the right side of the head substrate (60) a little shorter than in the reproduction mode. . As a result, the small diameter part (174B) of the cam (174) is pinched with the pinch roller (70) and the capstan shaft (40).
Prevents the tape from being pinched and allows the tape to lightly contact the erasing magnetic head (90).

Therefore, when the erase magnetic head (90) is activated in this state, the device enters the high speed erase mode. Also in this case, when the planet gear (180) and the reel shaft gear (31) mesh with each other, the control circuit (270) increases the rotation speed of the motor (130). The internal gear (170) is stopped in the state shown in FIG. 14 for the same reason as in the reproduction mode.

Next, switching from the high speed erase mode to the stop mode will be described. When a stop command signal is given from the command circuit (260) to the control circuit (270) in the state shown in FIG. 14, the control circuit (270) rotates the motor (130) clockwise.
As a result, the rotating plate (160) is engaged with the engaging projections (1
Rotate clockwise until the 63) contacts the taper (241) of the stopper plate (240). Then, thereafter, when the apparatus enters the state of FIG. 6 as in the above-described reproduction mode → stop mode, the control circuit (270) stops the rotation of the motor (130), and the apparatus enters the stop mode.

Next, switching from the reproduction mode to the fast-forward mode will be described. When a fast-forward command signal is given from the command circuit (260) to the control circuit (270) in the state of FIG. 1, the control circuit (2
70) rotates the motor (130) counterclockwise. As a result, the rotary plate (160) is engaged with the engaging projections (16) as shown in FIG.
Rotate counterclockwise until 3) contacts the taper (242) of the stopper plate (240). Then, thereafter, similarly to the stop mode → fast-forward mode described above, the apparatus goes through the state of FIG. 9 and then to the state of FIG. 10 into the fast-forward mode.

Next, switching from the fast-forward mode to the reproduction mode will be described. In the state of FIG. 10, when a reproduction command signal is given from the command circuit (260) to the control circuit (270), the control circuit (270) controls the motor (130) to change the device from the fast-forward mode to the stop mode. Similarly, FIG. 9, FIG. 11, and FIG.
The state is changed to that shown in FIG. Then, the control circuit (270) shifts the apparatus to the reproduction mode by shifting from the state of FIG. 7 and FIG. 8 to the state of FIG.

Next, switching from the reproduction mode to the rewind mode will be described. When a rewinding command signal is given from the command circuit (260) to the control circuit (270) in the state shown in FIG. 1, the control circuit (270) controls the motor (130) to operate the device in the same manner as in the reproduction mode described above. It shifts to the state of FIG. 6 through FIG. 8, FIG. 9, FIG. 11 and FIG. And the control circuit (27
In 0), next, the apparatus shifts to the rewind mode by shifting to the state of FIG. 13 in the same manner as the stop mode → rewind mode.

Next, switching from the rewind mode to the reproduction mode will be described. When a reproduction command signal is given from the command circuit (260) to the control circuit (270) in the state shown in FIG. 13, the control circuit (270) controls the motor (130) to rewind the apparatus to the rewind mode → stop mode. The state is changed to that shown in FIG. Then, the control circuit (270) shifts the apparatus to the reproduction mode by shifting from the state of FIG. 7 and FIG. 8 to the state of FIG.

Next, switching from the fast-forward mode to the rewind mode will be described. When a rewinding command signal is given from the command circuit (260) to the control circuit (270) in the state shown in FIG. 10, the control circuit (270) operates the device in the same manner as in the fast-forward mode → stop mode described above. After the state shown in FIG. 11 and FIG.
Move to the state shown in the figure. The control circuit (270) then switches the device to the first mode in the same manner as the stop mode → rewind mode described above.
Change to the state shown in Fig. 13 and set the rewind mode.

Finally, switching from the rewind mode to the fast-forward mode will be described. When a fast-forward command signal is given from the command circuit (260) to the control circuit (270) in the state of FIG. 13,
The control circuit (270) shifts the apparatus to the state shown in FIG. 6 as in the rewinding mode → stop mode described above. Then, the control circuit (270) shifts the apparatus to the fast-forward mode through the states shown in FIGS. 7, 8 and 9 and to the state shown in FIG.

(Second Embodiment) FIG. 16 is a schematic plan view of a magnetic recording / reproducing apparatus according to a second embodiment of the present invention, FIG. 17 is a partial sectional view taken along the line AA 'in FIG. 16, and FIG. FIG. 16 is a side view seen from the direction of arrow B in FIG. The same components as those in the first embodiment will be described using the same reference numerals. First, in this embodiment, the pinch arm (71) of the pinch roller (70) is connected to the head substrate (6
0) is pivotally supported. The shaft (72) that rotatably supports the pinch roller (70) is extended downward, and the through holes (63), (1) provided in each of the head substrate (60) and the main substrate (10).
It is arranged on the upper surface of the internal gear (170) via 3).
Also, the shaft (72) of this pinch roller (70) is a spring (73).
Is urged in the direction of the capstan shaft (40), and the pinch arm (71) is urged in the clockwise direction. The shaft (72) of the pinch roller (70) moves along the through hole (13) of the main substrate (10) according to the horizontal movement of the head substrate (60).

Next, as shown in FIG. 19, the cam (174) of the internal gear (170) has a symmetrical large diameter portion (174A) (174A) and a recess (17A).
4C) and pinch roller cam (174D). Then, the internal gear (170) exposes a part of the large-diameter portion (174A), (174A) or the recess (174C) from the through hole (12) of the main substrate (10) to expose the head substrate (60). It is set so as to contact the guide piece (62). As a result, the cam (174) causes the head substrate (60) to spring (100) according to the rotation of the internal gear (170).
16 is moved in the left-right direction against the urging force of. In addition, the pinch roller cam (174D) has an internal gear (17D).
0) is in the playback mode position, [of course, the head substrate (6
(0) is moving to the right in FIG. 16]. Since the shaft (72) of the pinch roller (70) is not moved, the pinch roller (70) and the capstan shaft (40) are pressed by the spring (73). (See Figure 22). In addition, the pinch roller cam (174D) allows the shaft (72) of the pinch roller (70) to pass through the through holes (13) (63) through the through holes (13) (63) when the internal gear (170) is in the high speed erase mode position. In order to move it to the left side in the figure, the pinch roller (70) and the capstan shaft (40) are separated (see FIG. 28). This is because the first embodiment has a high speed when a tape for pressing the tape to the magnetic head is provided at the rear of the tape of the reproducing section like the micro-cassette but the erasing section does not have the pad. Since the head substrate (60) itself moves during erasing, the erasing magnetic head (9
There is a problem that the contact between 0) and the tape becomes unstable. Therefore, in the second embodiment, during high speed erasing, the head substrate (60) is moved to the reproduction mode position to maintain stable contact between the erasing magnetic head (90) and the tape [the cam (174) has two large diameter portions. (1
74A) (174A)], and only the pinch roller (70) is moved by the pinch roller cam (174D). If a magnetic head integrated with reproducing and erasing is used, even in the first embodiment, the erasing magnetic head and the tape are brought into stable contact with the pad of the cassette during high speed erasing, but this head is a separate magnetic head. It has the disadvantage of being more expensive and having poorer characteristics.

In addition, the internal gear (170) should be returned in place to the holes (175) (17
5) (175) and return step (176) are provided. Since the device is usually set to reset the control circuit (270) when the head substrate (60) is in the state shown in FIG. 16, for example, in the state shown in FIG. 22 or FIG. If is inoperative, it will not operate normally even if the power is turned on again.

Therefore, in the state shown in FIG. 22 or 28, the user uses a screwdriver or the like to insert the return holes (175) (175) (175) or the return step from the voids (14) (15) of the main board (10). Division (17
By operating 6), the internal gear (1
70) can be set.

Next, in FIG. 16, the stopper plate (240) has its right end inserted into the right support plate (230), and then the left support plate (2).
20) is inserted and is provided so as to be movable in the left-right direction with respect to each of the support plates (220) (230). The stopper plate (240) has a coil spring (251) inserted between the step (243) and the support plate (230). Therefore, the stopper plate (240) is biased to the left. Further, the stopper plate (240) is provided with a recess (246) having a steep taper at the left end through a gentle taper (244) (245).
In the second embodiment, the stop mode (see FIG. 16) is used in the engaging projection (163) of the rotary plate (160) and the stopper plate (240).
If the recess (246) of the device is engaged, movement of the device itself does not move the rotating plate (160).

Next, the operation of the second embodiment will be described with reference to FIGS. 16 and 20 to 31. Incidentally, FIG. 32 shows the relationship between FIG. 16 and FIGS. 20 to 31 corresponding to the switching to each mode, and description will be given with reference to this figure [in FIG. The "clock" indicates the direction of rotation of the motor (130) in FIG. 16]. The motor (130) operates based on the block diagram shown in FIG. First, switching from the stop mode to the reproduction mode will be described. When a reproduction command signal is given from the command circuit (260) to the control circuit (270) in the state shown in FIG. 16, the control circuit (270) causes the motor (130) to move to the first position.
Rotate clockwise in Fig. 16. As a result, the flywheel (110) and the drive gear (130) also rotate clockwise. Also, the rotating plate (160) tends to rotate clockwise due to the clockwise rotation of the drive gear (120), but the engagement protrusion (163) engages with the recess (246) of the stopper plate (240). Therefore, it stops in that state [this is due to the biasing force of the coil spring (251) as described in the first embodiment]. In this state, the rotational force of the drive gear (120) is transmitted to the internal tooth part (171) of the internal gear (170) via the planetary gear (180), and the internal gear (170) does not rotate. Rotate clockwise. When this internal gear (170) rotates and the step (173) comes into contact with the support plate (220) as shown in FIG. 20, the large-diameter portion of the cam (174) of the internal gear (170). (174A) moves the guide piece (62) of the head substrate (60) to the right. Therefore, the pinch roller (70) and the capstan shaft (40) hold the tape, and the reproducing magnetic head (80).
Contacts the tape. The cam (174) of the guide piece (62)
The urging force to act to rotate the internal gear (170) counterclockwise due to the shape of the cam (174), and the internal gear (170) stops in the above state.

In the above state, the internal gear (170) does not rotate any further in the counterclockwise direction, so that the rotary plate (160) engages with the engaging protrusion (1
63) against the urging force of the spring (251), the stop plate (2
40) to the right and rotate clockwise as shown in Fig. 21. Then, the rotating plate (160) further has its abutting portion (162).
Rotates until it comes into contact with the support plate (220), and the planet gear (180) meshes with one reel shaft gear (21) as shown in FIG. This puts the device in playback mode.

Next, switching from the reproduction mode to the stop mode will be described. When a stop command signal is given from the command circuit (260) to the control circuit (270) in the state shown in FIG. 22, the control circuit (270) rotates the motor (130) counterclockwise.

As a result, the rotary plate (160) rotates counterclockwise until the engaging projection (163) contacts the taper (245) of the stopper plate (240) as shown in FIG. In this state, the planetary gear (180) and the internal tooth part (171) of the internal gear (170) have already meshed, so the rotational force of the drive gear (120) is transmitted through the planetary gear (180) to the internal teeth. It is transmitted to the internal tooth portion (171) of the gear (170). Therefore, the internal gear (170) rotates clockwise. The rotation of the internal gear (170) causes the guide piece (6
The contact position between 2) and the cam (174) changes. With this, the biasing force [by the spring (100)] against the cam (174) of the guide piece (62) acts to rotate the internal gear (170) clockwise by the shape of the cam (174), Internal gear (170) is second
The state shown in Fig. 3 is obtained. Then, when the drive gear (120) further rotates counterclockwise, as shown in FIG. 24, the internal gear (170)
The stepped portion (172) of the contact portion abuts on the support plate (220). In this state,
When the drive gear (120) continues to rotate in the counterclockwise direction, the rotary plate (160) engages with the stopper plate (24) by the engaging projection (163).
0) is moved to the right against the urging force of the spring (251), and the engaging projection (163) is moved to the stopper plate (2) as shown in FIG.
Engage with the recess (246) in 40). When this happens,
The control circuit (260) rotates the motor (130) clockwise. Then, the internal gear (170) rotates counterclockwise. The contact position between the guide piece (62) and the cam (174) is changed by the rotation of the internal gear (170), and the internal gear (170) is moved by the urging force of the guide piece (62) to the 16th position as in the case described above. It becomes the state of the figure. In this state, the control circuit (270) stops the rotation of the motor (130), and the device enters the stop mode.

Next, switching from the stop mode to the fast-forward mode will be described. When a fast-forward command signal is given from the command circuit (260) to the control circuit (270) in the state of FIG. 16, the control circuit (270) rotates the motor (130) clockwise,
Stop mode-> Play mode
Move to the state shown in the figure. Then, in the state of FIG. 21, the control circuit (270) rotates the motor (130) counterclockwise.

Therefore, as in the playback mode → stop mode, the device
Move to the state shown in Fig. 23. In this state, as in the case of FIG. 16, the pinch roller (70), the capstan shaft (40), the respective magnetic heads (80), (90) and the tape are completely separated. In this state, the control circuit (270)
Rotate the motor (130) clockwise again. Therefore,
The rotating plate (160) rotates until its contact portion (162) contacts the support plate (220) as shown in FIG. Then, when the planetary gear (180) meshes with the reel shaft gear (21), the device enters the fast-forward mode.

Next, switching from the fast-forward mode to the stop mode will be described. When a stop command signal is given from the command circuit (260) to the control circuit (270) in the state of FIG. 26, this control circuit (270) rotates the motor (130) counterclockwise. In this state, the internal gear (170) is stopped by the urging force of the guide piece (62), the rotary plate (160) rotates counterclockwise, and the device enters the state shown in FIG. The subsequent steps are the same as those in the reproduction mode → stop mode.

Next, switching from the stop mode to the high speed erase mode will be described. When a reproduction command signal is given from the command circuit (260) to the control circuit (270) in the state of FIG. 16, this control circuit (270) rotates the motor (130) counterclockwise. In this state, since the rotating plate (160) is stopped, the internal gear (170) rotates clockwise and the device moves to the 25th position.
The state is as shown in the figure. In this state, due to the large diameter portion (174A) of the cam (174) of the internal gear (170), the head substrate (60)
The guide piece (62) moves to the right. The internal gear (17
0) stops in this state due to the shape of the cam (174). Therefore, the erasing magnetic head (90) contacts the tape as in the reproducing mode. However, the pinch roller (70) moves to the left by the pinch roller cam (174D),
Do not pinch the tape with the capstan shaft (40). When the drive gear (120) further rotates counterclockwise in this state, the device enters the state shown in FIGS. 27 and 28 for the same reason as in the stop mode → reproduction mode, and enters the high speed erase mode. .

Next, switching from the high speed erasing mode to the reproducing mode will be described. When a stop command signal is given from the command circuit (260) to the control circuit (270) in the state of FIG. 28, the control circuit (270) rotates the motor (130) clockwise. This brings the rotary plate (160) into the state shown in FIG.

In this state, the rotational force of the drive gear (120) is transmitted through the planetary gear (180) to the internal gear (171) of the internal gear (170).
Is transmitted to Therefore, the internal gear (170) rotates counterclockwise, and the contact position between the guide piece (62) and the cam (174) changes. Also in this case, the internal gear (174) is in the state shown in FIG. 29 for the same reason as in the case of the reproduction mode → stop mode. Then, when the drive gear (120) further rotates in the clockwise direction, the step portion (173) of the internal gear (170) abuts the support plate (220) as shown in FIG.
The engaging projection (163) of (0) engages with the recess (246) of the stopper plate (240) as shown in FIG. When this happens,
The control circuit (270) rotates the motor (130) counterclockwise. As a result, the internal gear (170) rotates clockwise. The guide piece (62) is rotated by the rotation of the internal gear (170).
The contact position between the cam and the cam (174) is changed, and the internal gear (170) is in the state shown in FIG. 16 as in the case described above. This puts the device in a stop mode.

Next, switching from the stop mode to the rewind mode will be described. When a rewinding command signal is given from the command circuit (260) to the control circuit (270) in the state shown in FIG. 16, the control circuit (270) rotates the motor (130) counterclockwise to stop mode → high speed. As in the erase mode, the device shifts from the state shown in FIG. 25 to the state shown in FIG. Then, in the state of FIG. 27, the control circuit (270) rotates the motor (130) clockwise in the same manner as the high speed erase mode → stop mode. Therefore, the apparatus shifts to the state shown in FIG. In this state, the control circuit (270) rotates the motor (130) counterclockwise again. Therefore, the rotary plate (160) rotates until its contact portion (161) contacts the support plate (220) as shown in FIG. Then, when the planet gear (180) meshes with the reel shaft gear (31), the device enters the rewind mode.

Next, switching from the rewind mode to the stop mode will be described. When a stop command signal is given from the command circuit (260) to the control circuit (270) in the state of FIG. 31, this control circuit (270) rotates the motor (130) clockwise.
In this state, the internal gear (170) is stopped by the biasing force of the guide piece (62), and the rotary plate (160) rotates clockwise to reach the state shown in FIG. The subsequent steps are the same as those in the high speed erase mode → stop mode.

It should be noted that other playback modes-> fast forward mode, fast forward mode-> play mode, playback mode-> rewind mode, rewind mode-> replay mode, fast forward mode-> rewind mode, rewind mode-> fast forward mode are also basically The description is omitted here because it is performed according to FIG. 32.

In the first and second embodiments, the control circuit (270) controls the motor (130) at a predetermined time timing when switching between the modes.
A position detecting sensor for the rotating plate (160) and the internal gear (170) is provided, and the control circuit (270) uses the motor (1
30) may be controlled.

(G) Effect of the Invention The present invention is configured as described above, and the head substrate is arranged at a predetermined position by controlling the rotation direction of the motor by the control means and moving the planetary gear in the predetermined direction. At the same time, one of the reel shafts can be rotated. Therefore, it is not necessary to use a magnetic solenoid for switching the traveling mode, the device can be downsized, and a large instantaneous current is not required. In addition, the drive gear and the planetary gear are accommodated in the internal gear, and the size of the device can be further reduced.

Also, during high-speed erasing, the pinch roller and capstan shaft can be separated from each other while keeping the head substrate in the playback mode position, and the contact between the tape and head can be kept safe regardless of the type of cassette tape. be able to.

[Brief description of drawings]

1 is a schematic plan view of a magnetic recording / reproducing apparatus according to a first embodiment of the present invention, FIG. 2 is a partial sectional view taken along line AA 'in FIG. 1, and FIG. 3 is a plan view of an internal gear. 4 and 5 are sectional views of the rotary plate and the planetary gear, FIG. 5 is a block diagram of the same, and FIGS. 6 to 14 are state transition diagrams of the same. FIG. 15 is also a movement transition diagram. FIG. 16 is a schematic plan view of a magnetic recording / reproducing apparatus according to the second embodiment of the present invention.
FIG. 18 is a partial sectional view of AA ′ in FIG.
16 is a side view seen from the direction of arrow B in FIG. 16, FIG. 19 is a plan view of the internal gear, FIG. 20 to FIG. 31 are similar state transition diagrams, and FIG. 32 is a motion explanatory diagram. is there. (20), (30) ... reel shaft, (21), (31) ... reel shaft gear, (60) ... head substrate, (80) ... reproducing magnetic head, (90) ... erasing magnetic head , (110) …… flywheel, (120) …… drive gear, (130) …… motor, (160) …… rotating plate, (170) …… internal gear, (17
1) …… Internal teeth, (174) …… Cam, (180) …… Planetary gear.

Claims (1)

(57) [Claims] 1. A magnetic head, a head substrate on which the magnetic head is mounted, a flywheel, a motor for rotating the flywheel forward and backward, control means for controlling the motor, and a pair of reel shafts. A reel shaft gear for rotating each of the reel shafts, a drive gear coaxially provided on the flywheel, a rotary plate rotatably provided coaxially with the flywheel, and the rotation gear meshing with the drive gear. A planetary gear that is rotatably supported by a plate and that moves so as to mesh with each reel shaft gear by the rotation of a rotating plate that corresponds to the rotation of a drive gear; and a planetary gear that is rotatably provided coaxially with the flywheel and that has one planetary gear. An internal gear provided with a cam for varying the position of the head substrate in accordance with the internal tooth portion meshing with the planetary gear and the rotational position in the process of moving from the reel shaft gear to the other reel shaft gear. , In a state where the planetary gear meshes with the internal gear, engages with the rotating plate, transmits the rotation of the planetary gear to the internal gear to rotate the internal gear, and A magnetic recording / reproducing apparatus comprising: an engaging unit that operates so as to release the engaged state when reaching a predetermined position.