JPS6141053B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for moving a pinch roller toward and away from a capstan.

Generally speaking, in a recording/playback device, such as a cassette-type video tape recorder, which pinches and transports a magnetic tape between a capstan and a pinch roller for recording/playback, when the tape is stopped, the magnetic tape and the pinch roller do not come into contact when the cassette tape is loaded. Therefore, it is necessary to keep the pinch roller as far away from the magnetic tape surface in the cassette and from the capstan as possible. Furthermore, in the paused state, it is necessary to slightly separate the capstan and the pinch roller so that they can operate quickly when moving to the next recording/reproducing state. Also,
At this time, if the tape path changes significantly, the tape position will shift during so-called splicing, resulting in signal loss, so it is necessary to make the space between the capstan and the pinch roller as small as possible. Furthermore, in the recording/reproducing state, the magnetic tape must be transported by being pinched by a capstan and a pinch roller.

As mentioned above, in video tape recorders, the pinch roller must be located in at least three different positions relative to the capstan.

In conventional video tape recorders, when transitioning from a stop state to a recording/playback state, the capstan and the pinch roller are brought close to each other in conjunction with the operation of pulling out the magnetic tape from the cassette. When the withdrawal operation is completed, the plunger is suctioned by a solenoid to press the pinch roller against the capstan. Another method has also been considered in which the pinch roller is moved closer to the capstan by pushing in the operating lever, and after the magnetic tape pull-out operation is completed, the plunger is sucked by a solenoid to press the pinch roller against the capstan.

However, such a conventional configuration requires two different mechanisms for the approach and crimping operations of the pinch roller to the capstan, resulting in a complicated structure, poor assembly workability, and high costs. Ta.

Conventionally, during a temporary stop operation, the pinch roller pressing operation is canceled by cutting off the power to the solenoid, the pinch roller is separated from the capstan, and the drive of the magnetic tape is temporarily stopped. However, it is difficult to keep the gap between the pinch roller and the capstan as small and constant as possible, and the shock of the solenoid's plunger suction release action also causes a relatively large change in the tape path during the pause action, making it difficult to take continuous shots. There was also the issue of not having one.

The present invention can eliminate such drawbacks and problems of the conventional example, and provides three different positions of the aforementioned pinch roller with a simple structure, realizing reliable operation and cost reduction.

Hereinafter, the present invention will be explained based on illustrated embodiments. 1 to 3, 1 is a capstan, 2 is a wedge-shaped pinch roller moving member rotatably supported on a base plate (not shown) by a shaft 3, and one arm portion thereof Near the tip of the pinch roller 2a, a pinch roller 4 is rotatably supported on a shaft 5 so as to be able to move toward and away from the capstan 1, and
Between the end of the other arm portion 2b and the fixed portion 6 is a coil-shaped coil that biases the pinch roller moving member 2 to rotate about the shaft 3 in a direction that allows the pinch roller 4 to come into pressure contact with the capstan 1. A tension spring 7 is added.

Reference numeral 8 indicates the position shown in FIG. 1 (this is referred to as the first position) in response to the pressing operation of the operating mechanism of the video tape recorder, such as a record/play button, a pause button, and a stop button (all not shown). This is a drive member that can be displaced into three different positions, the position shown in Figure 2 (referred to as the second position) and the position shown in Figure 3 (referred to as the third position), which are indicated by the arrows. It is configured to be guided linearly and reciprocally in the X direction and in the opposite direction by an appropriate guide mechanism (not shown). In addition, the above-mentioned first position, second position, and third position are, for example, based on the illustrated reference line.
When the distances between L ₀ and the left end of the drive member 8 are La, Lb, and Lc at each position, La<Lb<
Assume that the relationship Lc is satisfied.

Furthermore, first and second pressure receiving parts 9a and 9b formed by bending a part of the arm part 2b are provided on the side edge of the other arm part 2b of the pinch roller moving member 2. It is being In this case, the first and second pressure receiving parts 9a and 9b are
The distances between these and the center of rotation of the pinch roller moving member 2, that is, the shaft 3, are different. And those first and second pressure receiving parts 9
Corresponding to a and 9b, the drive member 8 is also provided with each first
and a first pressure-receiving portion that can come into contact with the second pressure-receiving portions 9a and 9b.
and second pressurizing parts 10a, 10b are formed. Here, the first and second pressure receiving parts 9
a, 9b, and the first and second pressurizing parts 10a, 1
0b means that when the drive member 8 is in the first position shown in FIG.
10b does not come into contact with any of the first and second pressure receiving parts 9a, 9b, and when the drive member 8 moves in the direction of arrow X and is brought to the second position shown in FIG. , only the first pressure applying part 10a presses the first pressure receiving part 9a, and the pinch roller moving member is slightly rotated clockwise against the tensile force of the tension spring 7, and the driving member 8 moves in the direction of the arrow X. Move further in the direction to the third
When brought to the third position shown in the figure, conversely, only the second pressure applying part 10b presses the second pressure receiving part 9b, and the pinch roller moving member 2 resists the tensile force of the tension spring 7. The relationship is set in such a way that it is then rotated further to the right.

Therefore, when the driving member 8 is in the first position, it is in the recording/reproducing state, when it is in the second position, it is in the paused state, and when it is in the third position, it is in the stopped state. If 8 is associated with the operations of the video tape recorder's ``record/playback button'', ``pause button'', and ``stop button'', a series of linear movements of the drive member 8, and with small strokes,
A state in which the pinch roller 4 is pressed against the capstan 1 with the required pressure contact force (Fig. 1) and a state in which the pinch roller 4 is slightly separated from the capstan 1 (in the second state).
) and a state in which the pinch roller 4 is far away from the capstan 1 (FIG. 3) can be obtained.

Other embodiments of the present invention are shown in FIGS. 4 and 5, respectively. In the embodiment shown in FIG. 4, a tension spring 7' corresponding to the embodiment 7 described above is stretched between spring hooks 11 and 12 provided on the arm portion 2b of the pinch roller moving member 2 and the drive member 8, respectively. be. The movement of the pinch roller 4 towards and away from the capstan 1 is essentially the same as in the previous embodiment.

In FIG. 5, a part 10a' corresponding to the first pressurizing part 10a of the above-mentioned embodiment is constructed with a screw 14 screwed onto a part 13 of the drive member 8, which rotates the screw 14. By adjusting the amount of protrusion, the gap between the pinch roller 4 and the first pressure receiving part 9a can be adjusted, and the distance between the pinch roller 4 and the capstan 1 during a temporary stop can be easily adjusted. Note that the screw 14 is connected to the first pressure receiving portion 9a.
It is clear that the same is true for those provided.
In addition, if it is desired to also adjust the separation distance of the pinch roller 4 from the capstan 1 in the stopped state, an adjustment mechanism similar to the above or having the same effect may be installed on either the second pressure section 10b or the second pressure receiving section 9b. Needless to say, it would be a good idea to provide one.

As is clear from the above description, the present invention provides a pressurizing point (pressing point) for a pinch roller moving member that is rotatable according to the amount of linear movement (displacement) of a driving member.
By changing the distance from the center of rotation of the pinch roller moving member, for example, by just slightly moving the only driving member linearly back and forth, it is possible to press the pinch roller against the capstan. Three different modes, including a state in which the pinch roller is slightly separated from the capstan and a state in which the pinch roller is greatly separated from the capstan, can be easily and reliably obtained. Therefore, especially when the present invention is applied to a video tape recorder or an ordinary audio tape recorder in which the pinch roller needs to be displaced in three ways according to each state of recording/playback, pause, and stop, This brings about great effects in simplifying the structure, downsizing, and cost reduction of the device.

In addition, as illustrated in FIG. 5, the present invention provides a mechanism that adjusts the gap (pressing timing) between the drive member and the pinch roller moving member at one or more locations of the abutting portion of the drive member and the pinch roller moving member. ,
For example, the separation distance of the pinch roller from the capstan during a temporary stop or stop can be adjusted very easily, which has a very large effect. In the above-described embodiment of the present invention, the pinch roller is slightly separated from the capstan (temporarily stopped state) and the pinch roller is widely separated from the capstan (stopped state), so that the drive for the pinch roller moving member is The pressure points (pressing points) of the member are 9a and 10a (or 10
a') and 9b and 10b, but if you want to displace the pinch roller at three or more different distances with respect to the capstan, the rotation of the pinch roller moving member It is sufficient to provide three or more pressing points (pressing points) at different distances from the center of motion, and it goes without saying that this case is also included in the present invention.

[Brief explanation of the drawing]

FIGS. 1, 2, and 3 are plan views of main parts in each state of one embodiment of the present invention, and FIGS. 4 and 5 are plan views of main parts of other embodiments of the present invention, respectively. . 1... Capstan, 2... Pinch roller moving member, 2a, 2b... Arm portion, 3, 5... Shaft,
4... Pinch roller, 6... Fixed part, 7, 7'...
...Tension spring, 8... Drive member, 9a, 9b... Pressure receiving part, 10a, 10a', 10b... Pressure part, 14
……Screw.

Claims (1)

[Scope of Claims] 1. A rotatable pinch roller moving member that supports the pinch roller so as to be movable in directions toward and away from the capstan, and the pinch roller moving member presses the pinch roller against the capstan. An elastic body that provides rotational force such as
a driving member disposed to be linearly reciprocally movable and rotating the pinch roller moving member by movement in one direction such that the pinch roller moves away from the capstan, and the driving member and the pinch roller The moving member means that a plurality of positions where the driving member can press the pinch roller moving member are provided at different distances from the center of rotation of the pinch roller, and the driving member can press the pinch roller moving member in accordance with the moving position of the driving member. A pinch roller stopping device characterized in that the pinch roller moving member is configured to have different pressing positions, and the pinch roller is separated from the capstan by a different distance depending on each pressing position. . 2. In the description of claim 1, the driving member is displaced so as to be located in a first position, a second position, and a third position, and in the first position of the driving member, the driving member is in a non-pressing state with respect to the pinch roller moving member, so that the pinch roller is brought into pressure contact with the capstan by the elastic force of the elastic body, and when the driving member is in the second position, the pinch roller moving member is in a non-pressing state. The pinch roller moving member is pressed and rotationally displaced at a pressing position farthest from the center of rotation, and at the third position of the drive member, the pinch roller is at a pressing position close to the center of rotation of the pinch roller moving member. A pinch roller stopping device characterized in that it is configured to rotate and displace a moving member by pressing it. 3. In the description of claim 2, the driving member moves to the first position, respectively, in response to recording/playback, pause, and stop operations of the tape recorder.
A pinch roller stopping device characterized in that it is configured to be displaced to a second position and a third position. 4. In any one of claims 1 to 3, at a contact portion between the drive member and the pinch roller moving member related to at least one of the plurality of pressing positions, there is a gap between the two members. A pinch roller stopping device characterized by being equipped with a mechanism that allows adjustment of the gap between the pinch rollers.