JPH0628120B2 - Winding mechanism of tape recorder - Google Patents

Description

TECHNICAL FIELD The present invention relates to a winding mechanism of a tape recorder which is a tape drive unit such as a cassette tape recorder, and more particularly to a mechanism for fast-forwarding and rewinding.

(B) Conventional Technology In a conventional cassette tape recorder, particularly in a portable so-called headphone stereo tape recorder, a winding mechanism of a magnetic tape in a cassette half is rotatable on a main chassis 100 as shown in FIG. A supply reel base 101, a take-up reel base 102, and a gear 1 for rotating the reel bases 101 and 102, which are provided upright.
03, 104, 105, 106, 107,
It is driven by a drive mechanism having a motor (not shown).

In the above configuration, the gear 108 provided under the supply reel base 101 is constantly meshed with the gear 103, and similarly, the gear 10 provided under the take-up reel base 102.
9 is also always meshed with the gear 104. The gear 105 is for fast-forwarding, and has a bearing portion 112 of the sub-chassis 110 and the gear 105 on the upper end of a shaft 111 rotatably provided on a sub-chassis 110 slidably provided on the main chassis 100. And the gear 103 or the gear 10 by a spring 113 that is inserted between
The rotation driving force transmitted to the gear 107 is supplied to the supply reel base 101 or the take-up reel base 102 only when it is engaged with the gear 4. That is, the gear 105 has the shaft 111
Since the gear 106 provided at the lower end of the gear always meshes with the gear 107, the shaft 111 is locked to the gear 105 when the fast-forward or rewind mode of the operation modes is selected. Therefore, it is moved in the rotation direction of the gear 107 to mesh with the gear 104 or the gear 103,
The magnetic tape in the cassette half (not shown) is fast-forwarded or rewound.

(C) Problems to be Solved by the Invention In the above example, the gear 105 is also in the reproduction mode.
Is driven to rotate. That is, in the reproduction mode, although the gear 105 is prevented from moving in the rotation direction of the gear 107 by the reproduction drive mechanism (not shown), the gear 1
The gear 05 is rotated against the urging force of the spring 113 because the gear 106 and the gear 107 are constantly meshed with each other. This is an unnecessary load for the motor, and such a load increases the current consumption of the motor and shortens the life of the battery that is the power supply.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a winding mechanism for a tape recorder that can reduce the power consumption during reproduction.

(D) Means for Solving the Problems Thus, according to the present invention, a supply reel base provided with a gear at the bottom and rotatably erected on the main chassis, and a gear provided at the bottom to rotate on the main chassis. Sliding on the main chassis and a take-up reel stand that is erected upright, and a fast-forward gear body that includes a gear that transmits a rotational driving force to a gear on one of the reel stands corresponding to the selected operation mode. A support member that is provided to rotatably support the fast-forward gear body, a transmission gear that transmits the rotational driving force to the fast-forward gear body, and the fast-forward gear body are in contact with each other. When the fast-moving gear body is moved, the moving means moves the fast-forward gear body to one of the reel bases corresponding to the selected operation mode, and when the reproduction mode is selected, it is brought into contact with the support member to slide. Suppress Also, there is provided a winding mechanism for a tape recorder, which comprises: a movement restraining means that abuts on the moving means and releases the contact between the fast-forward gear body and the moving means.

The fast-forward gear body includes a cylindrical body that is integrally formed with a gear that transmits a rotational driving force to a gear on one of the reel bases corresponding to the selected operation mode, and the moving means is provided on the outer peripheral surface of the cylindrical body. May contact each other to cause the fast-forward gear body to move due to frictional resistance between the outer peripheral surface of the cylindrical body and the moving means.

(E) Action The fast-forward gear body is moved to one of the reel stands, that is, the supply reel stand or the take-up reel stand side, corresponding to the operation mode selected by the moving means, that is, the fast-forward mode or the rewind mode. When the movement is completed, the fast-forward gear body transmits the rotational driving force to the gear of one of the reel bases to rotate the reel base at a high speed. Next, when the reproduction mode is selected, the movement restraining means operates to restrain the movement of the supporting member and release the contact between the fast-forwarding gear body and the moving means. By releasing the contact between the fast-forward gear body and the moving means, the resistance to the rotational driving force is reduced.

(F) Embodiments Embodiments of the present invention will be described in detail below with reference to the drawings, but the present invention is not limited to the following embodiments.

1 and 2, reference numeral 1 denotes a cassette half, which is held on the main chassis 2 by a mechanism (not shown). Reference numeral 3 denotes a supply reel base, which is rotatably inserted into a shaft 30 provided upright on the main chassis 2 and which has a stopper 30a.
It is prevented from falling out. A hub portion 3a is fitted into a reel hub (not shown) of the cassette half 1 to rotate the reel hub. A gear 3 is provided below the supply reel base 3.
b is provided and always meshes with the first idler gear 6. The first idler gear 6 is rotatably inserted in an upper portion of a stepped shaft 31 provided upright on the main chassis 2, and is prevented from coming off by a stopper 31a. First idler gear 6
Has the role of changing the direction of rotation. A take-up reel stand 4 is rotatably inserted into a shaft 32 provided upright on the main chassis 2 and is prevented from coming off by a stopper 32a. Like the supply reel base 3, the take-up reel base 4 also has a hub portion 4a. A gear 4 is provided below the take-up reel stand 4.
b is provided and always meshes with the second idler gear 5. The second idler gear 5 is rotatably inserted into an upper portion of a stepped shaft 33 provided upright on the main chassis 2, and is prevented from coming off by a stopper 33a. Like the first idler gear 6, the second idler gear 5 has a role of changing the rotational direction.

Reference numeral 7 denotes a support member (hereinafter referred to as a rapid feed lever), which has guide holes 7a and 7b into which the lower portions of the stepped shafts 31 and 33 are loosely inserted, and which substantially stands on the lower surface of the main chassis 2. It is configured to be slidably rotated about. The fast-forwarding lever 7 is provided with a bearing (metal part) 7c, and a shaft 8 is rotatably inserted in the bearing 7c. At one end of the shaft 8 is a cylindrical body 9b and a gear 9
A first fast-forward gear 9 integrally formed with a and a second fast-forward gear 10 are press-fitted and fixed to the other end. The shaft 8, the first rapid feed gear 9 and the second rapid feed gear 10 constitute a rapid feed gear body. Reference numerals 7d and 7e denote engaging portions, which are arranged so as to be able to come into contact with a release lever 14 which is a movement restraining means described later. The gear 9a with the first fast-forward gear 9 selectively meshes with the first and second idler gears 5,6.
Further, the cylindrical body 9b arranged below the gear 9a is arranged so as to be able to come into contact with a torque up lever 12 which is a moving means described later.

Reference numeral 11 denotes a transmission gear, which is rotatably inserted into a shaft 34 provided upright on the lower surface of the main chassis 2 and is prevented from coming off by a stopper 34a. The transmission gear 11 is always meshed with the second fast-forward gear 10, and is configured to be rotated in the clockwise and counterclockwise directions by a drive mechanism (not shown). A drive mechanism (not shown) may have a structure known in the art.

The torque up lever 12 is rotatably inserted into a fulcrum shaft 35 provided upright on the main chassis 2, and is provided with a contact portion 12a that comes into contact with the cylindrical portion 9b of the first fast-forward gear 9 described above. Contact portion 1 of release lever 14 described later
A pressing portion 12b that is pressed by 4b is provided. Thirteen
Is a spring, for example a coil spring, and the torque u
The p-lever 12 is biased counterclockwise in FIG. The spring 13 is attached between a spring hook 36 provided on the main chassis 2 and a spring hook portion 12c provided on the torque up lever 12. Since the torque up lever 12 is biased by the spring 13, the contact portion 12a of the torque up lever 12 is moved to the first fast-forward gear 9
Is applied to the first rapid feed gear 9 as a result.
Causes the frictional force necessary for the movement of the. As a result, the position of the first fast-forward gear 9 can be moved in the fast-forward mode and the rewind mode described later.

The release lever 14 has a guide hole 14a formed in two places.
Guide pins 37 that are provided upright at two locations on the main chassis 2 are fitted into the respective guide holes 14a.
The release lever 14 is constantly urged by the spring 15 in the direction opposite to the arrow B shown in FIG. Reference numeral 14b denotes an abutting portion which, when actuated, abuts the pressing portion 12b of the torque up lever 12 and releases the pressing of the torque up lever 12 against the first fast-forward gear 9. The releasing portion 14c of the releasing lever 14 presses the engaging portions 7d and 7e of the fast-forwarding lever 7 to release the meshing between the second idler gear 5 and the first idler gear 6 of the first fast-forwarding gear 9. With.

Next, each operation of this embodiment will be described with reference to FIGS.

The transition from the stopped state shown in FIG. 1 to the REW state in the rewind mode shown in FIG. 3 is started by the transmission gear 11 being rotated counterclockwise in FIG. 1 by a drive mechanism (not shown). . That is, due to the frictional resistance of the engaging portion 12a between the cylindrical portion 9b of the first fast-forward gear 9 and the torque UP lever 12, the first fast-forward gear 9 moves to the supply reel base 3 side, and as shown in FIG. The supply reel stand 3 meshing with the first idler gear 6 and constantly meshing with the first idler gear 6 is rotated in the direction of arrow C shown in FIG. Thereby, the magnetic tape (not shown) of the cassette half 1 can be rewound at high speed.

FIG. 4 shows the FF state in the fast-forward mode.
The FF state is obtained by rotating the transmission gear 11 in the clockwise direction in FIG. 1 contrary to the REW state. That is, when the transmission gear 11 rotates,
The cylindrical body 9b of the first fast-forward gear 9 and the torque up lever 12
By the frictional resistance generated between the engaging portion 12a of the
The fast-forward gear 9 moves to the take-up reel stand 4 side and meshes with the second idler gear 5. Since the second idler gear 5 is always meshed with the gear 4b of the take-up reel stand 4, the take-up reel stand 4 is rotated at a high speed by the rotational driving force from the transmission gear 11, and the inside of the cassette half 1 is rotated. The magnetic tape is fast forwarded.

In the above fast-forwarding and rewinding state, torque UP
Since the lever 12 is in contact with the cylindrical portion 9b of the first fast-forward gear 9, the torque up lever 12 is in continuous contact with the gear 9a, so that the rotation noise can be reduced.

Next, referring to FIG. 5, the operation state of the fast-forward mode (FF state)
The operation when the operation mode is switched to the operation mode of the reproduction mode will be described.

The release lever 14 is configured to be moved in the arrow B direction in the figure by a reproduction drive mechanism (not shown). When the release lever 14 moves, the release portion 14c presses the engaging portion 7d of the fast-forwarding lever 7, whereby the release portion 14c rotates the fast-forwarding lever 7 in the counterclockwise direction in FIG. The mesh with the second idler gear 5 is separated, and the contact portion 14b causes the torque U
The P lever 12 is rotated in the clockwise direction against the biasing force of the spring 13. As a result, the side pressure of the first fast-forward gear 9 is eliminated, and the regeneration mode is executed in a state in which a drive mechanism (not shown) does not receive an unnecessary load for regeneration. Therefore, since the unnecessary driving force for rotating the first fast-forward gear 9 is eliminated, the current consumption of the motor of the drive mechanism is reduced, and the battery as the power source of the motor can be made to last longer. Stopping from the playback state
It is obtained by returning the release lever 14 to the original position by stopping the reproduction drive mechanism (not shown) (state of FIG. 1).

Since the operation from the operation state (REW state) in the rewind mode to the reproduction state is the same as that from the FF state, description thereof will be omitted.

(G) Effect of the Invention According to the present invention, it is possible to obtain a tape recorder winding mechanism capable of reducing the power consumption of the battery as the power source of the tape recorder in the reproduction mode. Further, since the torque up lever, which is the moving means, is in contact with the cylindrical body of the fast-forward gear body, the operating noise during the FF and REW operations can be reduced.

[Brief description of drawings]

1 is a plan view of an embodiment of the present invention, FIG. 2 is a cross-sectional view taken along the line AA in FIG. 1, FIG. 3 is a plan view for explaining the operation in the rewinding mode, and FIG. FIG. 5 is a plan view for explaining the operation in the mode, FIG. 5 is a plan view for explaining the operation in the reproducing mode, and FIG. 6 is a view corresponding to FIG. 2 ... Main chassis, 3 ... Supply reel base, 3b ... Gear, 4 ... Take-up reel base, 4b ... Gear, 7 ... Fast-forward lever, 9 ... First fast-forward gear, 9a ... Gear, 9b ...... Cylindrical body, 10 ...... Second rapid feed gear, 11 ...... Transmission gear, 12 ...... Torque up lever, 14 ...... Release lever.

Claims (2)

[Claims] 1. A supply reel stand provided with a gear at a lower portion and rotatably erected on a main chassis; and a take-up reel stand provided with a gear at a lower portion and rotatably erected on a main chassis; A fast-forward gear body having a gear for transmitting a rotational driving force to a gear of any reel base corresponding to a selected operation mode, and a fast-feed gear body slidably provided on the main chassis and rotatably supported. The support member, the transmission gear that transmits the rotational driving force to the fast-forward gear body, and the fast-forward gear body that are in contact with each other. When the fast-forward gear body rotates due to the rotation of the transmission gear, the selected action of the fast-forward gear body A moving means for moving the fast-forward gear body to one of the reel bases corresponding to the mode, and a supporting member to prevent sliding when the reproduction mode is selected, and a fast-forward gear for contacting the moving means. Body and transfer Winding mechanism of a tape recorder, wherein the detent means for releasing the contact between the means, in that it consists of. 2. A fast-forward gear body comprises a cylindrical body integrally formed with a gear for transmitting a rotational driving force to a gear of any reel base corresponding to a selected operation mode, and an outer peripheral surface of the cylindrical body. 2. The winding mechanism of the tape recorder according to claim 1, wherein the moving means comes into contact with the moving means to move the fast-forward gear body due to frictional resistance between the outer peripheral surface of the cylindrical body and the moving means.