JPH043582B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a tape recorder, and particularly to a reel shaft drive device.

(B) Prior Art There are two types of magnetic tape drives in tape recorders: constant speed drive for playback (recording) operations and high speed drive for fast forward and rewind operations. Constant speed drive for playback (recording) operation is achieved by pressing a pinch roller against a capstan shaft to which the rotation of the electric motor is transmitted and to which a flywheel having large inertia is fixed. In addition, the running direction of the magnetic tape is opposite between high-speed drive for fast forwarding and high-speed drive for rewinding.
When the take-up reel shaft and the supply reel shaft are driven by an electric motor that rotates in only one direction, it is necessary to provide a transmission roller or a transmission gear that reverses the direction of rotation, resulting in a problem that the configuration becomes complicated. There is a technique disclosed in Japanese Unexamined Patent Publication No. 158310/1983 as a technique that improves this point. This technology transmits rotation to the take-up reel shaft or the supply reel shaft by reversing the direction of rotation of the electric motor during rewinding operation compared to during fast forwarding operation. It is used in a tape recorder equipped with an electric motor for playback drive and an electric motor for fast forwarding and rewinding, that is, a two-motor tape recorder. If such technology is adopted in a one-motor tape recorder, the direction of rotation of the flywheel will be reversed as the direction of rotation of the electric motor is changed, so when switching from the playback mode to the rewind mode, the switching operation will be difficult. It has the disadvantage that it cannot be done quickly.

(c) Purpose of the invention The present invention performs fast-forwarding and rewinding operations by switching the rotational direction of an electric motor, and also performs constant-speed drive for playback (recording) operation using the rotational force of the electric motor. It is an object of the present invention to provide a reel shaft drive device for a tape recorder as described above.

(D) Structure of the Invention The present invention provides an electric motor that rotates in opposite directions during fast-forwarding and rewinding operations, and drives a magnetic tape at a constant speed during playback, and a motor that rotates the magnetic tape at a constant speed during playback. first and second flywheels rotating in opposite directions;
a capstan shaft to which a flywheel is fixed, rotates together with the first flywheel, and drives the magnetic tape at a constant speed by pressing a pinch roller during a playback operation; A control plate that puts the drive mechanism of the tape recorder into a playback state, and when the electric motor rotates when the control plate is in the non-operating position, the rotation of the electric motor is transmitted and the rotational force causes the take-up reel shaft to be displaced in the rotational direction. or a high-speed drive mechanism that transmits the rotation of the electric motor to the supply reel shaft, and the rotation of the electric motor during playback operation and rewinding operation is achieved by obtaining the driving force of the reel shaft from the high-speed drive mechanism from the second flywheel. The directions are the same.

(E) Embodiments The drawings relate to the reel shaft drive device of the present invention, and FIG. 1 is a plan view of the main parts showing a non-reproducing state, FIG. 2 is a front view of the main parts showing the non-reproducing state, and FIG. Figure 3 is a side sectional view of the main parts showing the non-regenerated state, Figure 4 is a plan view of the main parts showing the regenerated state, Figure 5 is a front view of the main parts showing the regenerated state, and Figure 6 is the regenerated state. FIG. 7 is a side sectional view of the main parts shown, and FIG. 7 is an exploded perspective view of the main parts. Note that the fixed substrate is omitted in FIGS. 1 and 4. In the figure, reference numeral 1 is attached to a fixed base plate 2 by a shaft 3 so as to be rotatable between a stop position and a playback operation position, and is urged by a spring 4 in the direction of the stop position, that is, counterclockwise. A magnetic head 5 is attached to the upper surface, and an engaging pin 6 is formed on the lower surface. Reference numeral 7 denotes a positioning pin that comes into contact with the rotary plate 1 and regulates the position of the rotary plate 1 at the stop position. A pinch roller arm 8 is rotatably mounted on the rotary plate 1 by a shaft 9, and a pinch roller 10 is rotatably mounted thereon. 11 is a first flywheel which rotates as the rotation of an electric motor (not shown) is transmitted through a belt or the like; 12 is a capstan shaft to which the first flywheel 11 is fixed and which rotates together with the flywheel 11; Said pinch roller 1
0 is pressed and has the effect of driving the magnetic tape at a constant speed. 13 is the first flywheel 1
1 is a drive roller attached to the capstan shaft 12 to rotate together with the capstan shaft 12. 14 is a take-up reel shaft rotatably attached to the sub-board 15; 16 is a take-up reel stand attached to rotate together with the take-up reel shaft 14; meshing teeth 17 are provided on the peripheral edge thereof; It is formed. Reference numeral 18 denotes a take-up roller which is rotatably mounted below the take-up reel stand 16 coaxially with the take-up reel shaft 14, and its rotation is caused by a clutch mechanism (not shown) to control the winding. It is configured to be transmitted to the take-up reel shaft 14. 19
20 is a supply reel shaft that is rotatably attached to the sub-board 15, and 20 is a supply reel stand that is attached to rotate together with the supply reel shaft 19, and meshing teeth 21 are formed on the peripheral edge thereof. There is. Reference numeral 22 denotes a control plate which is mounted so as to be displaceable in the directions of arrows A and B by means of pins 23 and the like, and which is displaced from a non-operating position to an operating position in the direction of arrow A during a reproducing operation. , second
A control section 25 and a third control section 26 are formed. 27 is an engagement hole formed in the control plate 22 and engaged with the engagement pin 6 formed in the rotation plate 1, and when the control plate 22 is displaced in the direction of arrow A, the rotation It has the effect of rotationally displacing the moving plate 1 in the clockwise direction, which is the reproducing operation position. 2
Reference numeral 8 indicates a lock pin formed on the lower surface of the control plate 22, and reference numeral 29 indicates a lock rotatably attached to the fixed base plate 2 by a shaft 30 and biased counterclockwise by a spring 31. A lock portion 3 which is a member and engages with the lock pin 28
2 and a suction section 33 are provided. Reference numeral 34 denotes an electromagnet to which power is supplied when a regeneration operation is performed and to which power is supplied while in the regeneration operation state. In such a configuration, the spring 3
The structure is such that the control plate 22 cannot be locked and held in the operating position, that is, the position displaced in the direction of arrow A, with only one biasing force. Reference numeral 35 denotes a displacement plate which is provided with an abutment pin 36 that abuts on the first control portion 24 formed on the control plate 22, and whose displacement position is regulated by displacement of the control plate 22; A transmission roller 37 is rotatably mounted, which is pressed against the driving roller 13 and the winding roller 18 when the plate 22 is in the operating position. A second flywheel 38 is rotatably attached to the fixed base plate 2 by a shaft 39, and the rotation of the electric motor is transmitted by a belt or the like, and the second flywheel 38 rotates in a direction opposite to that of the first flywheel 11. It is configured so that it can be rotated. Reference numeral 40 denotes a control gear which is attached to rotate together with the second flywheel 38 and can be displaced in the axial direction, that is, in the vertical direction in FIG. 2, and is biased upward by a spring 41. has been done. Reference numeral 42 denotes a switching member which is rotatably attached to the fixed base plate 2 by a shaft 43 and is rotationally displaced by displacement of the control plate 22, and a contact portion 44 that abuts the upper surface of the control gear 40. , 45 and a control piece 46 that comes into contact with the second control portion 25 formed on the control plate 22 is formed. In this configuration, when the control plate 22 is in the non-operating position, the control gear 40 is displaced to the upper operating position by the biasing force of the spring 41, and the control plate 22 is in the non-operating position. When the control gear 40 is displaced to the operating position, the control gear 40 is displaced to the lower non-operating position by rotational displacement of the switching member 42 in the counterclockwise direction as it comes into contact with the control section 46 of the second control section 25. It is configured to be in the same state. A first transmission 47 is rotatably attached to the sub-board 15 by a shaft 48 and meshes with the control gear 40 when the control gear 40 is in the operating position to transmit the rotation of the control gear 40. It's a gear. 49 is a bearing fixed to the sub-board 15; 50 is a rotating shaft rotatably mounted by the bearing 49; 51 is fixed to the lower end of the rotating shaft 50 and the first transmission A second transmission gear 52 is always in mesh with the gear 47, and 52 is the rotation shaft 50.
The rotation of the second transmission gear 51 is directly transmitted via the rotation shaft 50. Reference numeral 53 indicates a circular support member which is rotatably attached to the bearing 49 and is made of a resin material. Reference numeral 54 indicates a rotary member which is rotatably attached to the rotary shaft 50 by the circular support member 53. It is a dynamic support plate and is made of magnetic material. A control shaft 55 is fixed on the rotation support plate 54 and controls the displacement operation of the rotation support plate 54. A control shaft 56 is rotatable on the rotation support plate 54 by the control shaft 55. This is a magnetic gear which is attached to the drive gear 52 and is always in mesh with the drive gear 52, and which has a magnetic force due to the magnetization of ferrite or the like mixed therein. 57 is the magnetic gear 56
and the rotary support plate 54, and the magnetic gear 56 and the rotary support plate 5
4 and has the function of forming a predetermined gap between the two. Reference numeral 58 denotes a shield disk made of a magnetic material, which is arranged on the upper surface of the magnetic gear 56 to rotate together with the magnetic gear 56, and forms a magnetic circuit together with the rotary support plate 54, and is arranged on the upper surface of the magnetic gear 56 to rotate together with the magnetic gear 56.
This serves to increase the efficiency of adsorption to the rotating support plate 54. In such a configuration, the drive gear 52
When the rotation support plate 54 rotates clockwise, the magnetic gear 56 rotates clockwise, and the magnetic gear 56 rotates clockwise.
When the drive gear 52 rotates counterclockwise, the rotation support plate 54 is rotated counterclockwise, and the magnetic gear 56 is formed on the take-up reel base 16. engaged tooth 17
They are related in such a way that they mesh with each other. When the control plate 22 is displaced in the direction of arrow A, which is the operating position, the control shaft 55 comes into contact with the third control portion 26 formed on the control plate 22, and the rotation support plate By restricting the displacement position of 54, the magnetic gear 56 is prevented from meshing with the meshing teeth 21 of the supply reel stand 20 and the meshing teeth 17 of the take-up reel stand 16. In such a configuration, during playback and rewinding operations, the first
The flywheel 11 is rotated counterclockwise, and the first flywheel 11 is configured to be rotated clockwise by the reversing operation of the electric motor during fast forward operation.

The reel shaft drive device of the present invention is constructed as described above, and its operation will be described next. When the tape recorder is in a stopped state, rotating plate 1
is in a state where it is displaced and held at the stop position by the biasing force of the spring 4, and the control plate 22 is in a state where the rotating plate 1
It is in a state where it is displaced and maintained in the direction of arrow B, which is the non-operating position, by the urging force received from the engaging pin 6 formed in the position. When the control plate 22 is in the non-operating position, the second control section 25 does not act on the control piece 46 of the switching member 42, and the control gear 40 whose position is controlled by the switching member 42 is in the operating position. The first transmission gear 47 is in mesh with the first transmission gear 47.
When the user performs a rewind operation while in such a stopped state, power is supplied to the electric motor, causing the first flywheel 11 and the second flywheel 38 to rotate counterclockwise and clockwise, respectively. When the second flywheel 38 rotates clockwise, the control gear 40 is rotated clockwise together with the second flywheel 38, and the rotation is transmitted to the second transmission gear 51 via the first transmission gear 47. .
As a result of the rotation of the electric motor being transmitted to the second transmission gear 51 in this manner, the rotation is transmitted to the drive gear 52 via the rotating shaft 50, and the drive gear 52 is rotated clockwise. When the drive gear 52 rotates clockwise, the rotation of the drive gear 52 is transmitted to the magnet gear 56, and the magnet gear 56 is rotated counterclockwise. Because of the attraction force, the rotational load on the control shaft 55 of the magnetic gear 56 becomes greater than the rotational load on the bearing 49 of the rotary support plate 54. As a result, the rotational support plate 54 receives a clockwise rotational displacement force, and the rotational support plate 54 is rotationally displaced until the magnetic gear 56 meshes with the meshing teeth 21 formed on the supply reel base 20. . As a result of this operation, the rotation of the drive gear 52 is transmitted to the supply reel stand 20 via the magnet gear 56, and the supply reel stand 20 is rotationally driven in a clockwise direction. Therefore, the supply reel shaft 19 is rotated together with the supply reel stand 20, and the magnetic tape stretched between the supply reel shaft 19 and the take-up reel shaft 14 is rewound.

Although the rewinding operation is performed as described above, the fast forwarding operation will be explained next. When the user performs an operation for fast forwarding, the rotating direction of the electric motor becomes opposite to that during the rewinding operation, and the first flywheel 11 and the second flywheel 38 are rotated clockwise and counterclockwise, respectively. It will be done. Said second
When the flywheel 38 rotates counterclockwise, the control gear 40 is rotated counterclockwise together with the second flywheel 38 , and the rotation is transmitted through the first transmission gear 47 , the second transmission gear 51 , and the rotating shaft 50 . As a result of being transmitted to the drive gear 52, the drive gear 52 is rotated counterclockwise. When the drive gear 52 rotates counterclockwise, the rotation is transmitted to the magnet gear 56, and the rotation support plate 54 is rotated by a counterclockwise displacement force.
When the rotational support plate 54 is rotated counterclockwise, the magnetic gear 56 meshes with the meshing teeth 17 formed on the take-up reel stand 16. When such an operation is performed, the rotation of the drive gear 52 is transmitted to the take-up reel stand 16 via the magnet gear 56, and the take-up reel stand 16 is rotationally driven in the counterclockwise direction. Therefore, the take-up reel shaft 14 is rotated counterclockwise together with the take-up reel stand 16, and the magnetic tape stretched between it and the supply reel shaft 19 is rapidly fed.

As described above, the rewinding and fast forwarding operations are performed in the reel shaft drive device of the present invention, but next, the reproducing operation will be explained. When the user performs a playback operation, power is supplied to the electric motor and the electric motor is rotated in the same direction as during the rewinding operation described above.
Flywheel 11 and second flywheel 38
are rotated counterclockwise and clockwise, respectively. Further, when a regeneration operation is performed, the control plate 22 is displaced in the direction of arrow A, which is the operating position, by the rotational force of the electric motor, etc., and power is supplied to the electromagnet 34. When the control plate 22 is moved to the operating position, a lock pin 28 formed on the control plate 22
engages with the locking portion 32 of the locking member 29. In such a state, since power is supplied to the electromagnet 34, the lock pin 28 is held locked by the lock portion 32 of the lock member 29, and the control plate 22 is held in the operating position shown in FIG. be done. When the control plate 22 is thus displaced to the operating position, the edge of the engagement hole 27 formed in the control plate 22 displaces the engagement pin 6 formed in the rotating plate 1 in the direction of arrow A. , the rotary plate 1 is rotated clockwise and held at the playback operation position. When the rotary plate 1 is held at the playback operation position, the magnetic head 5 contacts the magnetic tape and the pinch roller 10 presses against the capstan shaft 1.
2 will be crimped. Further, when the control plate 22 is displaced to the operating position, the displacement plate 35 is displaced to the operating position due to the relationship between the first control portion 24 formed on the control plate 22 and the abutment pin 36, and the transmission roller 37
is pressed onto the driving roller 13 and the winding roller 18. When the control plate 22 is displaced to the operating position, the second control part 25 formed on the control plate 22 comes into contact with the control piece 46 of the switching member 42, and moves the switching member 42 counterclockwise about the shaft 43. rotational displacement. When the switching member 42 rotates counterclockwise, the control gear 40, which was in the operating position, is displaced downward against the biasing force of the spring 41, and the fifth
7 and 6 to the non-operating position shown in FIG. As is clear from FIG. 6, in such a state, the control gear 40 and the first transmission gear 47 are disengaged, so that the rotation of the electric motor is not transmitted to the drive gear 52. Therefore, the take-up reel shaft 14 and the supply reel shaft 19 are not driven at high speed by the magnetic gear 56. Further, when the control plate 22 is in a state displaced to the operating position, the third control portion 26 formed on the control plate 22 is moved to the control shaft 5.
It is in a contact relationship with 5. Therefore, the control shaft 55
Since the displacement position of the rotary support plate 54 to which the magnetic gear 56 is attached is regulated, even if the rotary support plate 54 is displaced due to carrying the tape recorder, etc., the magnetic gear 56
does not mesh with the meshing teeth 17 of the take-up reel stand 16 and the meshing teeth 21 of the supply reel stand 20. When the user performs a playback operation, the control board 22 is moved to the operating position, and the above-described operations are performed, and the tape recorder enters the playback operation state. In such a reproducing operation state, the magnetic tape is driven at a constant speed by the pinch roller 10 being pressed against the capstan shaft 12, and the rotation of the drive roller 13 attached to the capstan shaft 12 is transmitted through the transmission roller 37 to wind the magnetic tape. The rotation of the take-up roller 18 is transmitted to the take-up reel shaft 14 via the clutch mechanism, thereby driving the magnetic tape at a constant speed for reproduction operation.

The switching to the reproducing operating state is performed as described above, but the operation when switching from the reproducing operating state to the rewinding operating state will be described next. Such a switching operation is performed by cutting off the power supply to the electromagnet 34. That is, since the rotational direction of the electric motor in the reproducing operation state and the rotational direction of the electric motor during the rewinding operation are the same, there is no need to stop the rotation of the electric motor. When the power supply to the electromagnet 34 is cut off, the locking force of the lock pin 28 by the lock member 29 is insufficient, and the control plate 22
is displaced in the direction of arrow B by the biasing force of spring 4. Further, the rotating plate 1 is also displaced from the regeneration operation position to the stop position by the biasing force of the spring 4. When the control plate 22 returns to the non-operating position, the displacement plate 35 is displaced to the non-operating position, and the switching member 42 is rotated clockwise, resulting in the state shown in FIG. 2. When the displacement plate 35 is displaced to the non-operating position, the transmission roller 37 is separated from the drive roller 13 and the winding roller 18,
The driving force to the take-up reel shaft 14 is cut off. Further, when the rotary plate 1 is displaced to the stop position, the pinch roller 10 is separated from the capstan shaft 12, so that the constant speed drive operation for the regeneration operation is canceled. In this way, the drive device for the regeneration operation becomes inactive, but the rotational displacement of the switching member 42 displaces the control gear 40 to the operating position and meshes with the first transmission gear 47. When the control gear 40 meshes with the first transmission gear 47, the rotation of the electric motor is controlled by the control gear 4.
0, is transmitted to the drive gear 52 via the first transmission gear 47, the second transmission gear 51, and the rotating shaft 50, and the drive gear 52 is rotated clockwise as described above. When the drive gear 52 rotates clockwise, the rotation support plate 54 rotates clockwise, and the magnetic gear 56 meshes with the meshing teeth 21 formed on the supply reel base 20, so that the supply reel shaft 19 rotates. The magnetic tape is rotated clockwise to rewind the magnetic tape.

As described above, switching from the reproducing operating state to the rewinding operating state is performed, but switching to the fast forwarding operating state is performed by cutting off the power supply to the electromagnet 34 and switching the direction of rotation of the electric motor. When such an operation is performed, the drive gear 52 is rotated counterclockwise, which is the opposite direction to the switching to the rewind operation described above, and the take-up reel shaft 14 is rotated for fast forwarding. In this way, switching from the reproducing operating state to the rewinding operating state and switching to the fast forwarding operating state is performed, but next, a case in which a stop operation is performed will be described. When a stop operation is performed in the reproducing operation state, the power supply to the electromagnet 34 is cut off, and the power supply to the electric motor is also cut off. As a result of this operation, the drive mechanism of the tape recorder enters the state shown in FIGS. 1, 2, and 3, and the electric motor stops rotating, so that the tape recorder comes to a halt.

In this embodiment, the constant speed drive operation for playback has been explained, but since the drive of the magnetic tape during playback and recording is the same, the explanation of the constant speed drive operation for recording has been omitted. .

(F) Effects of the Invention The reel shaft drive device of the present invention provides a tape recorder configured to perform fast-forwarding and rewinding operations by switching the rotational direction of an electric motor. A direction opposite to the rotational direction of the first flywheel fixed to the capstan shaft that drives the magnetic tape at a constant speed during playback operation using the rotational force of the drive gear provided to transmit rotation to the take-up reel shaft and the supply reel. Since the direction of rotation of the electric motor is made the same during playback and rewinding operations by obtaining the rotation speed from the second flywheel, which is provided to rotate at It can be done. Therefore, the present invention can be applied to a tape recorder that repeatedly performs playback and rewinding operations, such as a tape recorder for office machines or a tape recorder for language practice, and which repeatedly plays back the same signal. This has a very large effect.

[Brief explanation of drawings]

The drawings all relate to the reel shaft drive device of the present invention; FIG. 1 is a plan view of the main parts showing the non-reproducing state, FIG. 2 is a front view of the main parts showing the non-reproducing state, and FIG. 3 is the non-reproducing state. Fig. 4 is a plan view of the main part showing the regeneration state, Fig. 5 is a front view of the main part showing the regeneration state, and Fig. 6 is a side view of the main part showing the regeneration state. The sectional view and FIG. 7 are exploded perspective views of essential parts. Explanation of main drawing numbers, 1... Rotating plate, 5... Magnetic head, 10... Pinch roller, 11... First flywheel, 12... Capstan shaft, 13...
... Drive roller, 14 ... Take-up reel shaft, 16
... Take-up reel stand, 18 ... Take-up roller, 19 ... Supply reel shaft, 20 ... Supply reel stand, 22 ... Control board, 37 ... Transmission roller, 3
8...Second flywheel, 40...Control gear,
42...Switching member, 47...First transmission gear, 51
...Second transmission gear, 52...Drive gear, 54...
Rotation support plate, 56...magnetic gear.

Claims (1)

[Claims] 1. An electric motor that is rotated in a direction opposite to the direction of rotation during a fast-forward operation during a rewind operation; first and second flywheels that are rotationally driven by the electric motor and rotate in opposite directions to each other; a capstan shaft to which a flywheel is fixed, rotates together with the first flywheel, and drives the magnetic tape at a constant speed by pressing a pinch roller during a playback operation; a control plate for pressing the pinch roller onto the capstan shaft; and a control plate for transmitting rotation to a drive roller and a take-up reel shaft provided on the first capstan shaft when the control plate is in an operating position. a transmission roller that is in pressure contact with the take-up roller and transmits the rotation of the first flywheel to the take-up reel shaft; and when the control plate is in a non-operating position, the rotation of the electric motor is transmitted and rotated in forward and reverse directions. The drive gear is rotatably mounted on a rotation support plate that is rotationally displaced in the rotational direction of the drive gear, and is provided on the take-up reel shaft and the supply reel shaft during fast forwarding and rewinding operations. a second gear that meshes with the meshing teeth and transmits the rotation of the drive gear to the take-up reel shaft and the supply reel shaft, and that rotates the rotational force of the drive gear in a direction opposite to the rotation direction of the first flywheel; 1. A reel shaft drive device for a tape recorder, characterized in that the rotating direction of the electric motor is made the same during playback and rewinding operations by being obtained from a flywheel.