JPH0341301Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field The present invention relates to a tape recorder, and particularly to a reel shaft drive device.

(b) Conventional technology The drive of the reel shaft in a tape recorder is
There are three drive operations: a drive operation of the take-up reel shaft for a playback operation, a drive operation of the take-up reel shaft for a fast-forward operation, and a drive operation of the supply reel shaft for a rewind operation. Generally speaking, a driving device that performs such a driving operation is one that uses one electric motor or one that uses two electric motors. Furthermore, in a tape recorder in which the reel shaft is rotationally driven by two electric motors, one electric motor drives the capstan shaft, and the other electric motor drives the reel shaft. . In a device in which the reel shaft is driven by an electric motor that rotates in only one direction, when driving the supply reel shaft, it is necessary to rotate the reel shaft in the opposite direction to that of the take-up reel shaft. As a fast-forwarding and rewinding device for a tape recorder, as described in Japanese Utility Model Application Publication No. 19042/1984, a pressure roller is pressed against a reel stand, and the reel stand is rotated by the frictional force. be. During fast forwarding and rewinding operations, the reel stand requires a relatively large torque, so in order to transmit rotation through friction, it is necessary to press the pressure roller against the reel stand with a large pressure force. Tape recorders that use batteries as a power source have a problem in that the load is large and the battery life is shortened. As a technology that improves this point, for example,
As disclosed in Japanese Patent No. 24177, there is a technique in which rotation of an electric motor is transmitted to a take-up reel shaft and a supply reel shaft using gears.

(c) Problems to be solved by the invention A tape recorder configured to transmit the rotation of an electric motor to a take-up reel shaft and a supply reel shaft using gears rotates integrally with the take-up reel shaft. A transmission gear is provided for transmitting the rotation of the drive gear to a rewinding gear which is attached to rotate integrally with the fast-forwarding gear and the supply reel shaft, which are attached to the feed reel shaft. In the reel shaft drive device, the transmission gear is mounted on a rotary lever and is configured to engage the transmission gear with the drive gear by rotationally displacing the transmission gear in mutually opposite directions during fast forwarding and rewinding operations. Since the rotational directions of the drive gear and the rewinding gear are opposite to each other, in either one of the drive states, the rotation of the drive gear acts on the shaft of the transmission gear in a direction that releases the meshing thereof. Then, when the magnetic tape runs to the end or start end during fast forwarding or rewinding operation, the transmission gear and, for example, the fast forwarding gear are disengaged by the above-mentioned disengagement action, and at this time a noise called gear squeal occurs. This causes a problem of discomfort to the user. The present invention aims to provide a reel shaft drive device using gears that solves these problems.

(d) Means for solving the problem In the present invention, a transmission gear that meshes with the drive gear during fast forwarding and rewinding operations and transmits rotational force to the fast forwarding gear and the rewinding gear is rotatably mounted. A leaf spring is attached to a rotary lever which is attached so as to be rotatably displaced, and when the switching sliding plate is displaced to the operating position, the displacement force applied to the rotary lever via the leaf spring causes the rotation. displacing the movable lever to the drive position, and when the rotary lever is in the fast-forward drive position, a blocking piece provided on the switching slide plate prevents the rotary lever from returning to the non-operating position; It was designed to prevent this.

(E) Function The present invention uses the elastic force of the leaf spring to displace and hold the rotary lever to which the transmission gear is rotatably attached at the fast forward drive position and the rewind drive position, and also to switch A blocking piece provided on the plate prevents the rotary lever from returning from the fast-forward drive position to the non-operating position, thereby preventing the occurrence of gear noise.

(F) Embodiment The drawings all relate to the reel shaft drive device of the present invention; FIG. 1 is a plan view showing the stopped state, and FIG. 2 is a plan view showing the fast forward operating state. In the figure,
Reference numeral 1 denotes a take-up reel shaft which is rotatably attached to a fixed base plate 2, and a fast feed gear 3 is attached to it so as to rotate integrally with the take-up reel shaft. 4 is fixed board 2
This is a supply reel shaft which is rotatably attached to the feed reel shaft, and a rewinding gear 5 is attached so as to rotate integrally with the supply reel shaft. Reference numeral 6 denotes a capstan shaft which is rotatably attached to the fixed base plate 2 and to which the rotation of an electric motor (not shown) is transmitted through a belt or the like, and the drive gear 7 is attached so as to rotate integrally with the capstan shaft. . An intermediate gear 8 is rotatably attached to the fixed base plate 2 by a shaft 9, and is always in mesh with the rewinding gear 5. Reference numeral 10 is attached to the fixed substrate 2 so as to be movable in the directions of arrows A and B by cooperation with pins 11, 12, guide holes 13, and guide grooves 14, and an operation button 1.
5 is a switching sliding plate attached to which when a fast forward operation is performed, the position is shifted from the intermediate position shown in FIG. 1 in the direction of arrow A, and when a rewind operation is performed, It is configured to be positioned at a rewinding operation position displaced in the B direction. 16 is rotatably and freely attached by cooperation between a mounting pin 17 fixed to the fixed base plate 2 and a mounting hole 18, and is urged to rotate counterclockwise by a spring 19. The first arm 2
0, a second arm 21 and a third arm 22. 23 is fixed to the fixed base plate 2 and is connected to the first arm 20 of the rotating lever 16.
This is the first pin that comes into contact with, and functions to regulate the position of the rotary lever 16 and to serve as a rotational fulcrum when the rotary lever 16 is rotated counterclockwise due to rapid forward operation. It is. Reference numeral 24 denotes a second pin which is fixed to the fixed base plate 2 and is in contact with the second arm 21 of the rotary lever 16, which regulates the position of the rotary lever 16 and also controls the rewinding operation of the rotary lever 16. It functions as a rotational fulcrum during clockwise rotational displacement. 2
Reference numeral 5 designates a first regulating pin fixed to the fixed base plate 2, with which the second arm 21 comes into contact when the rotating lever 16 is rotated counterclockwise, and the rotating lever 16 is rotated. It has the function of regulating the rotation position in the counterclockwise direction. Reference numeral 26 denotes a second regulating pin fixed to the fixed base plate 2, which the first arm 20 comes into contact with when the rotary lever 16 is rotated clockwise, and the clockwise rotation of the rotary lever 16 It has the effect of regulating the rotational position in the direction. Reference numeral 27 denotes a leaf spring formed at the end of the third arm 22 constituting the rotating lever 16, the tip of which is engaged with the engaging portion 28 formed on the switching sliding plate 10. in a state. 29
is a blocking piece formed on the switching sliding plate 10, which prevents the rotating lever 16 from moving when in the fast forward operation state.
When the lever rotates toward the non-operating position, it comes into contact with the contact portion 30 of the third arm 22, and has the function of preventing further rotational displacement of the rotary lever 16. 31
is a transmission gear rotatably attached to the rotary lever 16 by a shaft 32, and when the rotary lever 16 is in the fast-forward drive position, it meshes with the drive gear 7 and the fast-forward gear 3, and the winding When in the return drive position, it is meshed with the drive gear 7 and the intermediate gear 8.

The present invention is constructed as described above, and its operation will be explained next. When the tape recorder is in a stopped state, the switching sliding plate 10 is in the intermediate position shown in FIG. Therefore, the rotating lever 16 is not subjected to the biasing force of the leaf spring 27, and the rotating lever 16 is positioned by the biasing force of the spring 19. That is, the pivot lever 16 is moved between the first arm 20 and the first arm by the biasing force of the spring 19.
The position is regulated by the contact with the pin 23 and the contact between the second arm 21 and the second pin 24. In this state, the transmission gear 31 attached to the rotary lever 16 is at a position apart from all the gears, including the fast-forwarding gear 3, the drive gear 7, and the intermediate gear 8.

When the operation button 15 is operated to perform a fast forward operation while in the above-mentioned stopped state, the switching sliding plate 10 is displaced in the direction of arrow A, and is displaced to the fast forward operation position shown in FIG. The switching sliding plate 10
When the switching sliding plate 10 is displaced to the fast-forward operation position, the switching sliding plate 10
An engaging portion 28 formed on the rotary lever 16 acts on a leaf spring 27 formed on the rotary lever 16 to rotationally displace the rotary lever 16 in a counterclockwise direction. At this time, the rotary lever 16 is rotated counterclockwise with the first arm 20 and the first pin 23 maintaining the contact relationship, that is, using the first pin 23 as a rotation fulcrum. Then, the rotating lever 16
The rotational displacement position in the counterclockwise direction is the second arm 21.
is regulated by contact with the first regulating pin 25. The state shown in FIG. 2 shows the state in which the rotary lever 16 is displaced to the fast-forward drive position by such operation, and in this state, the rotary lever 16 is rotatably attached to the rotary lever 16. The transmission gear 31 that has been moved is in mesh with the drive gear 7 and the fast-forwarding gear 3. Therefore, the counterclockwise rotation transmitted to the drive gear 7 as the electric motor rotates is transmitted to the fast feed gear 3 via the transmission gear 31, and the take-up reel shaft 1 is driven to rotate in the counterclockwise direction. be done. By rotating the take-up reel shaft 1 in this manner, the magnetic tape is fast-forwarded. The meshing relationship between the transmission gear 31, the driving gear 7, and the fast-forwarding gear 3 in such a fast-forwarding operating state is determined by the second arm 2 of the rotating lever 16.
1 and the first regulating pin 25, and is held in an optimal state by the elastic force of the leaf spring 27. Further, when in such a rapid forward operation state, the blocking piece 29 formed on the switching sliding plate 10 is located at a position very slightly apart from the abutting portion 30 formed on the third arm 22 of the rotating lever 16. be. In this state, take-up reel shaft 1
is rotated counterclockwise to perform fast-forwarding of the magnetic tape, but when the magnetic tape has run to the end, the take-up reel shaft 1 is forced to stop rotating. When the take-up reel shaft 1 stops rotating, the fast-forwarding gear 3 is also stopped rotating together with the take-up reel shaft 1. When the fast-forward gear 3 stops rotating, the shaft 32 of the transmission gear 31 that is in mesh with the fast-forward gear 3 is moved in the direction of arrow F due to the rotational force from the drive gear 7 and the reaction force from the fast-forward gear 3. The force will act on it. When a force is applied to the shaft 32 in the direction of arrow F, the rotating lever 16 rotates clockwise, which is the non-operating position, about the first pin 23, but when it rotates slightly, the switching sliding plate 10 Since the abutting portion 30 of the third arm 22 abuts against the blocking piece 29 formed in the third arm 22, further rotational displacement of the rotary lever 16 is prevented. As a result of preventing the rotational displacement of the rotational lever 16 toward the non-operating position, the meshing state of the transmission gear 31 with the drive gear 7 and the fast-forwarding gear 3 is not broken, and a noise called gear squeal occurs. It will never occur. In such a state, the rotation of the motor is absorbed by the slip between the belt and the pulley.

Although the fast forward operation is performed as described above, the rewind operation will be explained next. Such a rewind operation is performed by operating the operation button 15 from the stopped state shown in FIG. 1 to displace the switching slide plate 10 to the rewind operation position in the direction of arrow B. When the switching sliding plate 10 is displaced to the rewinding operation position, the engagement portion 28 formed on the switching sliding plate 10 engages the leaf spring 2 formed on the rotating lever 16.
7 to rotate the rotary lever 16 clockwise. At this time, the rotating lever 16
The second arm 21 and the second pin 24 are rotated in a clockwise direction while maintaining the contact relationship between the second arm 21 and the second pin 24, that is, using the second pin 24 as a rotation fulcrum. The clockwise rotational displacement position of the rotary lever 16 is regulated by contact with the second regulating pin 26 of the first arm 20. When the rotary lever 16 is displaced to the rewind drive position by such an operation, the transmission gear 31 meshes with the drive gear 7 and the intermediate gear 8, although not shown. As a result of this meshing operation, the counterclockwise rotation transmitted to the driving gear 7 is transmitted to the rewinding gear 5 via the transmission gear 31 and the intermediate gear 8, and the supply reel shaft 4 is rotated clockwise. It is driven to rotate. Such supply reel shaft 4
The rewinding operation of the magnetic tape is performed by the rotational drive of the magnetic tape. The meshing relationship between the transmission gear 31, the driving gear 7, and the intermediate gear 8 in such a rewinding state is determined by the contact between the first arm 20 of the rotary lever 16 and the second regulating pin 26, and The elastic force of the spring 27 keeps it in an optimal state. In this state, the supply reel shaft 4 is rotated clockwise to rewind the magnetic tape, but when the magnetic tape reaches the starting end, the supply reel shaft 4 is forcibly stopped from rotating. When the supply reel shaft 4 stops rotating, the rewinding gear 5 along with the supply reel shaft 4
And the intermediate gear 8 is stopped from rotating. When the intermediate gear 8 stops rotating, a load is applied to the transmission gear 31 that is meshed with the intermediate gear 8, but in this unwinding state, the shaft 3 of the transmission gear 31
2, a force is applied in the direction in which the transmission gear 31 bites between the drive gear 7 and the intermediate gear 8, so the meshing state of the transmission gear 31 with the drive gear 7 and the intermediate gear 8 is not broken. There is no noise called gear whine. Further, in such a state, the rotation of the electric motor is absorbed by the slip between the belt and the pulley.

(g) Effects of the invention The reel shaft drive device of the invention uses the biasing force of a leaf spring to displace the rotary lever to which the transmission gear is rotatably attached, and also adjusts the fast-forward drive position and winding. Since the engaged state of the gears at the return drive position is maintained by the biasing force of the leaf spring, the rotation transmission operation by the gears can be performed accurately and favorably. In addition, even if the magnetic tape runs to the end and the take-up reel shaft stops rotating during fast forward operation, the blocking piece formed on the switching slide plate prevents the rotary lever from returning to the non-operating position. Since the return operation is prevented, the meshing relationship of the gears is not broken, and the generation of noise called gear whine can be prevented, and the practical value of the present invention is very large.

[Brief explanation of drawings]

The drawings all relate to the reel shaft drive device of the present invention; FIG. 1 is a plan view showing the stopped state, and FIG. 2 is a plan view showing the fast forward operating state. Explanation of main drawing numbers, 1... Take-up reel shaft, 2...
... Fixed board, 3 ... Rapid feed gear, 4 ... Supply reel shaft, 5 ... Rewinding gear, 7 ... Drive gear,
8... Intermediate gear, 10... Switching sliding plate, 16...
Rotating lever, 20...first arm, 21...second
Arm, 22...Third arm, 23...First pin, 24...Second pin, 25...First regulation pin,
26... Second regulation pin, 27... Leaf spring, 29...
...Blocking piece, 31...Transmission gear.

Claims (1)

[Scope of utility model registration request] a drive gear rotatably attached to a fixed base plate and to which the rotation of the electric motor is transmitted; a switching sliding plate that is moved to a rewinding operation position in the opposite direction; a fast-forwarding gear that is installed to rotate integrally with the take-up reel shaft; and a fast-forward gear that is installed to rotate integrally with the supply reel shaft. a rewinding gear that is connected to the rewinding gear, an intermediate gear that is always in mesh with the rewinding gear, and a fast forward drive position and a rotary lever that is moved to a rewind drive position; and a rotary lever that is rotatably mounted on the rotary lever and meshes with the drive gear and the fast-forward gear when the rotary lever is in the fast-forward drive position; a transmission gear that meshes with the drive gear and the intermediate gear when in the return drive position; and a transmission gear that is formed on the rotary lever and whose end is engaged with an engagement portion that is formed on the switching sliding plate. and a blocking piece formed on the switching sliding plate to prevent the rotating lever from returning to the non-operating position when in the fast forward operation state, and the blocking piece is formed on the switching sliding plate. A reel shaft drive device for a tape recorder, characterized in that the rotary lever is displaced to each drive position by a rotary displacement force applied to the rotary lever via the leaf spring when the rotary lever is displaced to each operating position.