JPH0368460B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a magnetic recording and reproducing apparatus that uses a capstan and a pinch roller to transport a magnetic tape at a constant speed and wind it along a tape guide onto a take-up reel. It is.

Conventional configuration and its problems In general, in a magnetic recording/playback device in which a magnetic tape is transported at a constant speed by a capstan and a pinch roller and then wound onto a take-up reel during recording/playback, the magnetic tape is moved from the capstan to the take-up reel. The vibration system, which is composed of a spring constant made up of the elasticity of the magnetic tape and the elasticity of the tape guide along the way, and the moment of inertia of the reel system, resonates due to disturbances, resulting in tension fluctuations, resulting in wow and flutter. This was a contributing factor to the deterioration. As a countermeasure, in order to change the resonance point of the vibration system, the tape guide between the capstan and the take-up reel is energized by an elastic member such as a spring to a position that balances the tape tension. It was done to shift the frequency from the disturbance frequency.

Hereinafter, the configuration of the conventional example and its problems will be explained with reference to the drawings. FIG. 1 is a top view of the main parts of a conventional magnetic recording/reproducing apparatus. A magnetic tape 1 is wound onto a take-up reel 5 which is rotatably housed in a cassette shell 3 constituting a magnetic tape cassette.

When the magnetic tape 1 is stored in the cassette shell 3, the magnetic tape 1 crosses a notch 7 provided in the cassette shell 3 and is guided by a guide post 11 provided in the cassette shell 3.

When the cassette shell 3 is attached to a magnetic recording/reproducing apparatus, the capstan 9 is located on the back side of the magnetic tape 1 located in the notch 7.
Furthermore, a pinch roller 13 is disposed opposite the capstan 9 with the magnetic tape 1 in between. The pinch roller 13 is rotatably held on a pinch roller shaft 19 implanted in the arm 17. The arm 17 is held rotatably around a rotation shaft 15, and when the tape is running, the arm 17' approaches the position shown by the two-dot chain line in FIG. 1, and the pinch roller 13 is brought into pressure contact with the capstan 9. is,
When storing the tape, the arm 17 can be moved away to the position shown by the solid line in FIG.

Now, the running direction of the magnetic tapes 1 and 1' (arrow A
), guides 21 and 21' are located on the back side of the magnetic tape in the notch downstream of the capstan 9 as tape pull-out members.

The guides 21, 21' include guide arms 23,
It is implanted at the tip of 23' and is structured to rotate around a rotation shaft 25.

In the above description, the arms 17, 17' correspond to the "first lever" described in the "claims", and the "guide arms 23, 23'" similarly correspond to the "second lever". In addition, in the following explanation, the position of the pinch roller when storing the tape (the position indicated by 13 in FIG. 1) is referred to as the "first position", and the position of the guide (the first position) corresponds to the description in the "claims." The position indicated by 21 in the figure) will be described as the "third position". Further, when the tape is running, the state is indicated by a chain double-dashed line in the figure. Then, change the position of the pinch roller (the position indicated by 13' in Fig. 1) to the "second position".
Position of the guide (position shown as 21' in Figure 1)
will be described as the "fourth position".

Kick pins 27, 27' are installed in a part of the recording arms 23, 23', and plate cams 29, 29' fixed to the arms 17, 17'
However, as the arm 17' rotates to the position 17 during tape storage, the plate cam 29' rotates to the position 29, kicks the kick pin 27' toward 27, and the guide arm 23' 23, and therefore the guide 21' is rotated to 21 about the rotation shaft 25.

Next, when the tape is running, the magnetic tape 1 is
This will be the route. That is, the magnetic tape 1' is transferred at a constant speed while being held between the capstan 9 and the pinch roller 13', and the guide 21 pulls the magnetic tape 1 outward from the notch 7 to the position shown at 21', where it is moved. It passes through the guide post 11 and is wound onto the take-up reel 5. At this time, the magnetic tape 1' between the capstan 9 and the take-up reel 5 is
elasticity, as well as guide 21' and guide arm 2.
3' is further hung between a pin 31 implanted in the chassis (not shown) and a hole 35' on the guide arm 23', and urges the guide 21' to a position balanced with the tape tension. A vibration system is constituted by the equivalent elasticity constituted by the spring 33' and the moment of inertia of the take-up reel 5. In this vibration system, the spring constant of the spring 33' is set so as not to cause resonance due to disturbances from the take-up reel drive system or the like.

The problem with such a configuration is that the magnetic tape 1
When the tape is stored in the cassette shell 3, the guide 21' is rotated to the 21 position, and therefore the guide arm 23' is rotated to the 23 position. The cam 29' must rotate to the position 29 against the force of the extension as shown in FIG. I had to take it. Therefore, the mechanism for rotating the arm 17' to position 17 has become complicated.

OBJECTS OF THE INVENTION An object of the present invention is to provide a magnetic recording/reproducing device that can rotate a pinch roller arm or the like with a small force without changing the vibration system.

Structure of the Invention The magnetic recording/reproducing apparatus of the present invention is a magnetic tape cassette having a notch and configured such that a part of the magnetic tape runs across the notch. A capstan shaft for driving the magnetic tape located on the back side of the magnetic tape in the notch is movable between a first position separated from the capstan shaft and a second position where it can be pressed into contact with the capstan shaft. The first rotatable
a pinch roller held by a lever; and a third position located near the capstan shaft and on the back side of the magnetic tape in the notch, and a fourth position located outside the notch. a tape pull-out member held by a rotatable second lever so as to be movable between positions; an actuation mechanism that rotationally displaces the second lever by rotation of the first lever to move the member from the third position to the fourth position; and when the second lever is in the fourth position, the tape tension is increased. an elastic member biasing the second lever in a balanced manner;
By installing it between the lever and the lever, the pinch roller arm and tape guide arm can be rotated with light force without changing the vibration system.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 2 is a top view of essential parts of a magnetic recording/reproducing apparatus according to an embodiment of the present invention. In FIG. 2, a magnetic tape 1 is wound onto a take-up reel 5 which is rotatably housed in a cassette shell 3 for storing a magnetic tape cassette. When the magnetic tape 1 is housed in the cassette shell 3, it crosses a notch 7 provided in the cassette shell 3, and is guided by a guide post 11 provided in the cassette shell 3.

When the cassette shell 3 is attached to a magnetic recording/reproducing device, the magnetic tape 1 in the notch 7 is
A capstan 9 is located on the back side of the camera. Furthermore, a pinch roller 13 is arranged opposite the capstan 9 with the magnetic tape 1 in between. The pinch roller 13 is rotatably held on a pinch roller shaft 19 implanted in the arm 17. The arm 17 is held rotatably around the rotation axis 15,
When the tape is running, the arm 17' approaches the capstan 9 at the position indicated by the two-dot chain line in FIG. It is possible to separate.

Now, the running direction of the magnetic tapes 1 and 1' (arrow A
), guides 21 and 21' are positioned on the back side of the magnetic tape in the notch downstream of the capstan 9 as tape pull-out members. The guides 21, 21' are installed at the tips of the guide arms 23, 23' and are configured to rotate about a rotation shaft 25.

In the above description, the "arms 17, 17'" correspond to the "first lever" described in the "claims", and the "guide arms 23, 23'" similarly correspond to the "second lever". There is. In addition, in the following explanation, the position of the pinch roller when storing the tape (the position indicated by 13 in Fig. 2) is changed to the position of the guide (indicated by 13 in Fig. The position indicated by 21) is defined as the "third position". Further, the state when the tape is running is shown by the two-dot chain line in FIG. The position of the pinch roller (the position indicated by 13' in FIG. 2) is the "second position", and the position of the guide (the position indicated by 21' in the figure) is the "fourth position". the guide arm 23,
Kick pins 27, 27' are installed in a part of 23', and plate cams 29, 29' fixed to the arms 17, 17' move the arm 17' to position 17 when storing the tape. With the rotation, the plate cam 29' rotates to the position 29, kicks the kick pin 27' toward 27, rotates the guide arm 23' to 23, and thus the guide 21' to 21. Rotate around the moving shaft 25.

Next, when the tape is running, the magnetic tape 1 is
The magnetic tape 1' becomes the path of the capstan 9.
The guide 21 pulls the magnetic tape 1 outward from the notch 7, passes through the position indicated by 21', passes through the guide post 11, and transfers it at a constant speed while being held by the pinch roller 13'. It is wound up. At this time, the elasticity of the magnetic tape 1' from the capstan 9 to the take-up reel 5 and the guide 2
1', the elasticity of the guide arm 23', and the plate cam 2
Hole 37' on 9' and Hole 3 on guide arm 23'
A vibration system is constituted by the inertia of the take-up reel 5 and the equivalent elasticity constituted by the spring 33' which is applied between the ends of the guide 21' and biases the guide 21' to a position balanced with the tape tension. In this case, the spring constant of the spring 33' changes due to disturbances from the take-up reel drive system, etc.
The value is selected so that resonance does not occur in the vibration system.

As in the present embodiment described above, by providing the spring 33 between the guide arm 23 and the plate cam 29 fixed on the arm 17, the guide arm 23
, the plate cam 29 rotates in almost the same direction, and the spring 3
The length change in 3 can be kept small.

Effects of the Invention As is clear from the above description, the present invention provides a plate cam for kicking an elastic member to a guide arm fixed to a pinch roller holding arm and on which a tape guide is implanted, and a plate cam for kicking a guide arm having a tape guide implanted therein. By placing it in between, the reaction force due to the deformation of the elastic member is only slightly applied to both the guide arm and the arm for holding the pinch roller, and the rotational force of the arm for holding the pinch roller can be reduced. It has characteristics.

[Brief explanation of drawings]

FIG. 1 is a top view of essential parts of a conventional magnetic recording/reproducing apparatus, and FIG. 2 is a top view of essential parts of a magnetic recording/reproducing apparatus according to an embodiment of the present invention. 1, 1'... Magnetic tape, 3... Cassette shell, 5... Take-up reel, 7... Cassette shell notch, 9... Capstan, 11... Guide post, 13, 13'... Pinch roller, 15
...Rotation axis, 17,17'...Arm, 19,1
9'... Pinch roller shaft, 21, 21'... Guide, 23, 23'... Guide arm, 25... Rotating shaft, 27, 27'... Tight pin, 29, 2
9'...Plate cam, 31...Pin, 33, 33'...
Spring.

Claims (1)

[Claims] 1. When a magnetic tape cassette having a notch and configured such that a part of the magnetic tape runs across the notch is installed, the back side of the magnetic tape located in the notch is a magnetic tape driving capstan shaft located therein, and a first lever rotatable so as to be movable between a first position spaced from the capstan shaft and a second position in pressure contact with the capstan shaft. between the held pinch roller and a third position located near the capstan shaft and on the back side of the magnetic tape in the notch and a fourth position located outside of the notch; The second part is rotatable so that it can be moved.
a tape pull-out member held by a lever; and a tape pull-out member held by a lever;
an actuating mechanism that rotationally displaces the second lever by rotation of the first lever so as to move the tape drawer member from the third position to the fourth position as the tape pull-out member moves to the third position; and is the fourth
an elastic member biasing the second lever to balance the tape tension when in the position; A magnetic recording/reproducing device characterized by being provided between.