JPS6258055B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tape fast forwarding device that transmits the rotation of a capstan gear to a reel gear to fast forward a magnetic tape.

In the case of a tape fast-forwarding device in a conventional tape recorder, an idler is provided that can be freely engaged with and detached from the reel shaft, and the rotational force of the motor is transmitted to the reel shaft via this idler to perform fast-forwarding of the magnetic tape. It's summery.

However, apart from the rotation transmission path from the motor to the capstan shaft, a rotation transmission path from the motor to the reel shaft via the idler is provided.
Moreover, special means is required to engage and disengage the idler from the reel shaft, resulting in a complicated configuration.

Further, a tape recorder operation drive device has been proposed in which operations such as recording/playback and rewinding are performed using the rotational movement of a capstan flywheel (Japanese Patent Application Laid-open No. 63705/1983). however,
Since this device uses a belt to drive the idler attached to a rotating lever, the length of the belt changes as the lever rotates during rewinding, causing belt deterioration and uneven rotation. invite. Furthermore, when unwinding is released, the rotation transmission path from the motor to the reel cannot be quickly shut off, and there is a risk that the tape may be unwinded too much. When this device is applied to fast forwarding, there is a problem in that the tape is fed too much for the same reason as above.

The present invention was made based on the above circumstances, and its purpose is to enable rapid forwarding of a magnetic tape by utilizing the rotation of the capstan gear, and to reduce the rotation from the capstan gear to the reel gear. To provide a tape fast forwarding device with a simple configuration in which the transmission path is connected and disconnected using the rotation of the capstan itself, and the rotation transmission path from the motor to the reel can be quickly cut off when fast forwarding is canceled. It's about doing.

Hereinafter, the configuration of the present invention will be explained based on illustrated embodiments.

Figures 1 to 4 show the operation of the tape fast forwarding device in order, and 1 is a capstan shaft 1A.
A capstan gear with a drive gear attached to the 2
3 is a reel gear having an operating gear provided at the base end of the reel shaft 2A, and 3 is an idler gear.

The capstan gear 1 is always rotating in the direction of the arrow, and the idler gear 3 is rotatably supported by a movable support 4. Further, in the figure, reference numeral 5 denotes a rotating member whose one end is pivotally connected to a shaft 6, and a pin 7 protruding from the rotating end is inserted into a long hole 8 provided at one end of the movable support 4. and is connected to the movable support 4. A tension spring 10 is suspended between a pin 9 protruding from the movable support 4 and a pin 7 of the rotating member 5. The other end of the movable support 4 is attached to an arbitrary fixed part via a tension spring (first spring) 11 which is weaker than the spring 10. Therefore, the rotating member 5
When the movable support 4 rotates, the movable support 4 moves in a substantially straight direction, and the idler gear 3 meshes with the capstan gear 1 and the reel gear 2 as shown in FIGS. 3 and 4, or as shown in FIGS. 1 and 2. It is arranged to be spaced apart from each gear 1 and 2. Note that the elastic force of the tension spring 11 acts in a direction to separate the idler gear 3 from each gear 1, 2, and the rotation member 5
is biased in one direction by this spring 11, but the amount of rotation in that direction is limited by a stopper 12.

A partially toothed gear 13 serving as an engagement/disengagement rotating body is disposed near the capstan gear 1 so as to mesh with the capstan gear 1. This toothless gear 13 has a toothless portion 14 at one location on its outer periphery, and is designed to disengage with the capstan gear 1 within the range of this toothless portion 14. In addition, a rotatable pressure roller (pressure receiving part) is provided on the top surface of the partially toothed gear 13.
15 and a pair of locking protrusions 16A, 16B are provided, one protrusion (first abutting part) 16 from the center of rotation.
The distance A to the outermost side of A, and the distance B from the center of rotation to the innermost side of the other protrusion (second contact part) 16B.
The relationship is A<B.

In the figure, reference numeral 17 denotes a trigger lever that constitutes a trigger mechanism. This lever 17 is pivotally connected to a shaft 18, and is biased in one direction by a tension spring (second spring) 19, and is normally held at a stop as shown in Figure 1. 20 (first position). Further, the trigger lever 17 has a locking pawl (locking portion) 21 and a suction piece 22 bent, and when in contact with the stopper 20, the locking pawl 21 is attached to the inner side of the partially toothed gear 13. Locking protrusion 1
6A is locked to prohibit rotation of the partially toothed gear 13 in one direction. In addition, in this state where the locking protrusion 16A on the inside of the toothless gear 13 is locked with the locking pawl 21 of the trigger lever 17, the toothless gear 13 has its toothless portion 14 facing the capstan gear 1. The pressing roller 15 is pressed by the rotating lever 5, and the rotational force of the tension spring 11 in one direction is stored.

An electromagnet (solenoid) 23 is opposed to the attraction piece 22 of the trigger lever 17 . When energized, this electromagnet 23 attracts the attraction piece 22 of the trigger lever 17 and holds the trigger lever 17 at the second position. Then, the locking claw 2 of the trigger lever 17
1 is removed from the inner locking projection 16A and positioned on the rotational orbit of the outer locking projection 16B.

The operation of the tape fast forwarding device configured as described above is as follows.

Figure 1 shows the gears from capstan gear 1 to reel gear 2.
This shows the state before the so-called fast forward operation in which the rotation transmission path to the
The toothless gear 13 is engaged with the capstan gear 1 with its toothless portion 14 facing the capstan gear 1.
The rotating member 5 presses the pressure roller 15 due to the elastic force of the tension spring 11.

Therefore, when the electromagnet 23 is energized in connection with the fast-forward operation, the trigger lever 17 is pulled by the electromagnet 23 and rotates against the tension spring 19, as shown in FIG. Since the toothless gear 13 is removed from the capstan gear 1, the toothless gear 13 rotates slightly due to the pressing force of the rotating member 5 (the elastic force of the tension spring 11), and comes to mesh with the capstan gear 1.

Immediately after that, the rotating member 5 comes into contact with the stopper 12, so it does not press the pressure roller 15 any further, but the partially toothed gear 13 continues to move in a certain direction (with the capstan gear 1) due to its meshing with the capstan gear 1. (in the opposite direction). Then, as shown in FIG. 3, the rotating member 5 is rotated in the direction away from the stopper 12 by the pressing roller 15,
The movable support body 4 is largely moved in a direction against the spring 11 via the rotating member 5, and the idler gear 3 is meshed with the capstan gear 1 and reel gear 2, so that the rotation of the capstan gear 1 is transferred via the idler gear 3 to the reel gear 2. It will be transmitted. In addition, since the pressing roller 15 of the partially toothed gear 13 is rotatably provided on the partially toothed gear 13,
The rotating member 5 can be rotated smoothly while rolling along the side surface of the rotating member 5. Also,
The pressure roller 15 has an idler gear 3 connected to each gear 1, 2.
Although the rotation member 5 is further pressed after the rotation member 5 is engaged, the excessive movement of the rotation member 5 at this time is absorbed by the tension spring 10.

Then, after the rotating member 5 is pressed by the pressure roller 15 and rotates a certain amount, it returns to its original position. However, when the rotating member 5 turns to its returning operation and rotates slightly, the toothless gear 13 is rotated. The portion 14 faces the capstan gear 1, and the partially toothed gear 13 and the capstan gear 1 are disengaged from each other. Then, the partially toothed gear 13 rotates slightly due to its pressing roller 15 being pressed by the rotating member 5, and as shown in FIG.
It stops when it touches 1. Therefore, the return operation of the rotating member 5 is also prohibited by the pressing roller 15, and the idler gear 3 is held in the meshing position with respect to each of the gears 1 and 2 at that position.

Next, in connection with canceling the fast forward operation, the electromagnet 23
When the power is cut off and the trigger lever 17 returns to its initial position by the spring 19, the locking pawl 21 of the trigger lever 17 comes off the outer locking protrusion 16B and returns to the rotation orbit of the inner locking protrusion 16A. The partially toothed gear 13 is rotated in a fixed direction by the pressure roller 15 receiving the pressing force from the rotating member 5, thereby separating the idler gear 3 from each gear 1 and 2. Then, before the rotating member 5 contacts the stopper 12, the inner locking protrusion 16A contacts the locking pawl 21 of the trigger lever 17 as shown in FIG. Stop at the position. At this time, since the partially toothed gear 13 is not meshing with the capstan gear 1, the rotation member 5 and the movable support 4 are quickly moved by the return of the trigger lever 17. Therefore, the idler gear 3 is quickly separated from the capstan gear 1 and the reel gear 2.

As described above, according to this tape fast-forwarding device, the reel shaft 2A can be rotated at high speed by utilizing the rotation of the capstan shaft 1A, and the magnetic tape can be fast-forwarded. Also, electromagnet 2
3, the trigger lever 17 is set to the partially toothed gear 1.
3, the partially toothed gear 13 can be meshed with the capstan gear 1, and the idler gear 3 can be engaged with the capstan gear 1 by using the rotational force of the capstan shaft 1A itself.
can be engaged with the capstan gear 1 and reel gear 2, and the tape can be fast-forwarded. Furthermore, simply by stopping the power supply to the electromagnet 23 and removing the trigger lever 17 from the partially toothed gear 13, the idler gear 3 can be removed from the capstan gear 1 and reel gear 2, and the rotation transmission path between both shafts 1A and 2A can be cut off. .

Furthermore, when canceling the tape fast-forwarding operation, the tooth-missing gear 1 is set in a state in which the tooth-missing portion 14 of the tooth-missing gear 13 is opposed to the capstan gear 1, that is, in a state where the tooth-missing gear 13 is not meshed with the capstan gear 1.
Since this is done by rotating the idler gear 3, the idler gear 3 can be quickly separated from the capstan gear 1 and the reel gear 2. In other words, the rotation transmission path from the capstan gear 1 to the reel gear 2 can be quickly interrupted, thereby reliably preventing tape from being over-fed. In addition, since the idler gear 3 is meshed with the capstan gear 1 without using a belt or the like to drive the idler gear 3, problems such as uneven rotation due to changes in belt length during fast forwarding are prevented. be able to.

It should be noted that the present invention is not necessarily limited to the configuration of the embodiment described above, and can be implemented with various modifications. For example, the electromagnet 23 may be omitted and the trigger lever 17 may be directly rotated in connection with the fast-forward operation.

As described above based on the embodiments, according to the tape fast-forwarding device of the present invention, the magnetic tape can be fast-forwarded using the rotation of the capstan shaft without adversely affecting the rotation transmission path to the capstan shaft. Furthermore, the rotation transmission path from the capstan gear to the reel gear can be connected and disconnected using the rotation of the capstan shaft itself, and the configuration can be simplified. Also,
The rotation transmission path from the capstan gear to the reel gear can be quickly interrupted, and overfeeding of the tape can be reliably prevented.

[Brief explanation of the drawing]

1 to 4 are plan views showing a schematic configuration of a tape fast forwarding device in an embodiment of the present invention. 1... Capstan gear, 1A... Capstan shaft, 2... Reel gear, 2A... Reel shaft, 3
...Idler gear, 4...Movable support, 11...
First spring, 13... Gear with missing teeth, 14... Missing tooth portion, 15... Press roller (pressure receiving part), 16A,
16B... Locking protrusion (contact part), 17... Trigger lever (trigger member), 19... Second spring, 21... Locking claw (locking part), 23... Electromagnet (solenoid).

Claims (1)

[Claims] A movable support body 4 that can freely reciprocate and is normally held at the return position by the elastic force of the first spring 11.
When the movable support body 4 is rotatably supported by the movable support body 4 and is in the return position, it is in a position where it does not mesh with either the capstan gear 1 or the reel gear 2, and the movable support body 4
an idler gear 3 that meshes with the capstan gear 1 and the reel gear 2 by moving forward against the elastic force of the gear 2 and transmits the rotation of the capstan gear 1 to the reel gear 2; and the first and second contact portions 16A, 16B having different positions in the rotational direction and the first spring 1.
1, a solenoid 23 that is energized by fast-forwarding the tape, and a locking part 21, which normally has a second spring 19.
The locking portion 21 is held in the first position by the elastic force of
is positioned on the rotation orbit of the first abutting portion 16A of the partially toothed gear 13, and when the solenoid 23 is energized and moved to the second position, the locking portion 21 is moved to the second abutting portion of the partially toothed gear 13. 16B, and when the trigger member 17 is in the first position, the locking part 21 and the first abutting part 16A abut, and the partially toothed gear 13 is rotated. The toothless part 14 is opposed to the capstan gear 1, and when the trigger member 17 moves from the first position to the second position and the locking part 21 is disengaged from the first contact part 16A, the toothless gear 13 rotates to a position where it meshes with the capstan gear 1 by the elastic force of the first spring 11, the partially toothed gear 13 rotates due to the rotation of the capstan gear 1, and the partially toothed gear 13 rotates.
The movable support body 4 is moved forward in the pressure receiving part 15 of the above to mesh the idler gear 3 with the capstan gear 1 and the reel gear 2, and immediately after the toothed part of the partially toothed gear 13 is disengaged from the capstan gear 1, the second contact part 16B is brought into contact with the locking portion 21, and when the trigger member 17 returns from the second position to the first position and the locking portion 21 is disengaged from the second contact portion 16B, the elasticity of the first spring 11 The partially toothed gear 13 is rapidly rotated by the force to a position where the first contact portion 16A contacts the locking portion 21, and the idler gear 3 is rapidly separated from the capstan gear 1 and the reel gear 2. Tape fast forwarder.