JPS5919262A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To ensure the stable traveling for a magnetic tape despite of a change of the traveling mode, by providing a means to the base of a reproducer to have a contact with a pinch roller when the pinch roller is pressed to a capstan, and to control the inclination of tape moving direction at the pinch roller. CONSTITUTION:A means 14 is provided to a base 3 to have an external touch to a pinch roller 11 when the roller 11 is pressed to a capstan 10 and to control the inclination of tape traveling direction for the roller 11. Then the means 14 controls the inclination of the roller 11 which is caused by the roller 11 and the capstan 10 when a tape is driven to the tape traveling direction. The pressing force F of the roller 11 produced by a lever 13 to the capstan 10 acts on the direction which turns about 5 deg. toward the clockwise direction centering on the axial core of the roller 11 to the line connecting the axial core of the roller 11 and that of the capstan 10.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic recording and reproducing apparatus that can prevent unstable running of a magnetic tape caused by changing the running mode of the magnetic tape.

Conventionally, in magnetic recording and reproducing devices, such as household magnetic recording and reproducing devices, the running of a magnetic tape is achieved by sandwiching the magnetic tape between a capstan and a pinch roller that is pressed against the capstan, and by the rotation of the capstan and the frictional force. It is running. It consists of an elastic roller such as rubber to provide a frictional force between the vinyl magnetic tape and the capstan. Although the pinch roller is pressed against the capstan by another driving means, the capstan and the pinch roller may come into partial contact due to elastic deformation of the gear bustan, the pinch roller support shaft, and assembly errors in these machining operations.

In order to prevent this partial contact, the pinch roller and its support shaft are connected by a bearing provided in the middle part of the pinch roller in the axial direction, and the bearing clearance of this bearing is used to connect the pinch roller and its support shaft.
A measure has been adopted in which the pinch roller is configured to be tilted at a minute angle of, for example, about 1 degree with respect to the support shaft, and the pinch roller is brought into proper contact with the capstan.

However, in home magnetic recording and reproducing apparatuses, there are cases where the magnetic tape is reversed υ, twisted, reverse searched, and reproduced. In such a case, the direction and magnitude of the drive of the capstan or the magnitude of the tension of the magnetic tape change with respect to normal feeding of the magnetic tape, so that the pinch roller tilts around the bearing. That is, the axis of the pinch roller and the axis of the capstan are no longer parallel, and the axis of the pinch roller is inclined with respect to the #1l11 line of the capstan.

This inclination of the pinch roller relative to the capstan causes the magnetic tape to move in a direction perpendicular to its feeding direction during magnetic tape feeding. The magnetic tape performs a so-called upward movement or downward movement. For this reason, there is a drawback that unstable running occurs when the tape running mode changes, especially when the magnetic tape is reversed.

The invention has been made based on the above-mentioned problems, and it is an object of the present invention to provide a magnetic recording/reproducing device that can stably run a magnetic tape even if the running mode of the magnetic tape changes.

In order to achieve the above object, the present invention runs a magnetic tape in the forward and reverse directions using a rotationally driven capstan and a pinch roller rotatably supported by a bearing and pressed against the capstan. In the magnetic recording/reproducing device, the base of the magnetic recording/reproducing device is provided with means for contacting the pinch roller and regulating the inclination of the pinch roller in the tape moving direction when the pinch roller is pressed against the capstan. It is something.

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

FIG. 1 shows the main parts of an embodiment of the magnetic recording/reproducing device of the present invention. In the figure, 1 is a cassette, 1a is a guide pin provided in the cassette 1, and 2 is a guide pin that is wound around a reel in the cassette 1. It is a magnetic tape.

Reference numeral 3 denotes a base constituting a magnetic recording/reproducing device, 4 a tape guide tube containing a rotary head, and 5 a tape drawer guide means for mounting the magnetic tape 2 on the tape guide tube 4 at an angle of 180 degrees or more; 5 is moved along a guide body 6 provided on the base 3 by driving means (not shown). 7 is a stop means for the tape drawer guide means 5; 8 is a head for audio and control signals; 8A is a support shaft for the head 8; 9
10 is a guide boss, 10 is a capstan rotatably provided on the base 3, and this capstan 10 is a driving means (
(not shown).

A pinch roller 11 is pressed against the capstan 10 via the magnetic tape 2. This pinch roller 11 is the shaft 1
It is rotatably attached to the tip of a lever 13 that rotates about 2. After the magnetic tape 2 is mounted on the tape guide tube 4, the pinch roller 11 moves from the state shown by the two-dot chain line to the state shown by the solid line in FIG. Pressed down. As a result, the magnetic tape 2 sandwiched between the capstan 10 and the pinch roller 11 is driven to travel by the pressing force and the rotational force of the capstan 10.

When the capstan 10 rotates as shown by the solid line, the magnetic tape 2 is fed in the forward direction, whereas when the capstan 10 rotates, it is fed in the opposite direction.

The base 3 is provided with a means 14 that circumscribes the pinch roller 11 when the pinch roller 11 is pressed against the capstan 10 and restricts the inclination of the pinch roller in the tape moving direction.

The detailed structure of one embodiment of this 1M control means 14 will be explained in the second section.
This will be explained using figures. In this figure, the same reference numerals as in FIG. 1 are the same parts. The pinch roller 11 includes an inner cylindrical body 11A made of metal and an elastic body 11 made of rubber or the like fixed to the outer periphery of the inner cylindrical body 11A.
It is composed of B.

This pinch roller 11 is connected to a support shaft 15 at the tip of the lever 13.
It is rotatably mounted by a rolling bearing 16. The outer race 16A of the roller υ bearing 16 is connected to the inner cylindrical body 1.
The inner race 16B is fixed by the back of the support shaft 15 and the bush 17 press-fitted into the inner cylinder 11A, and the inner race 16B is fixed by the back of the support shaft 15 and the screw body 18 screwed into the support shaft 15.
It is fixed by The rolling bearing 14 is located approximately in the middle of the pinch roller 11 in the axial direction, and the bearing gap allows the pinch roller 11 to be attached to the support shaft 15.
This allows for an inclination of approximately ±2 degrees relative to the surface. The aforementioned regulating means '14 is for regulating the inclination of the pinch roller 11 in the tape moving direction that occurs when the pinch roller 11 and the capstan 10 drive the tape.
A roller body 19 is provided in contact with the outer peripheral surface of the pinch roller 11.

This roller body 19 is rotatably attached to l1II20. The shaft 20 is fixed to the base 3 by a threaded portion 21 at its lower part so that its axis is parallel to the axis of the pinch roller 11. The axial movement of the roller body 19 on the shaft 2o is restricted by a flange portion 20A located below the shaft 20 and a flange 22A of a nut 22 screwed into the upper part of the shaft 20. As shown in FIG. 1, the shaft 20 of the regulating means 14 is located on a line substantially perpendicular to the line connecting the axis of the capstan 1° and the axis of the pinch roller 11.

Capstan 10 of pinch roller 11 by lever 13
The pressing force F is applied clockwise around the axis of the pinch roller 11 with respect to the line connecting the axis of the pinch roller 11 and the axis of the capstan 10, as shown in FIGS. 1 and 3. It acts in a direction approximately 56 rotations in the direction.

Next, the operation of the embodiment of the present invention described in -E will be explained.

The pinch roller 11 operates around the υ bearing 16 within the tolerance range of the rolling bearing 16.
The pinch roller 11 is indicated by the solid line shown in FIG. 1 and 2 in FIG.
When pressed against the capstan 10 as shown by the dotted chain line,
The pinch roller 11 is connected to the cab/(tongue 10 and regulating means 14).
As a result, only the inclination in the substantially tangential direction of the contact portion between the pinch roller 11 and the capstan 10, that is, the inclination in the tape moving direction, is restricted. Therefore, the axis of the pinch roller 11 is maintained parallel to that of the capstan 10.

Therefore, the outer peripheral surface of the pinch roller 11 uniformly contacts the magnetic tape 2 sandwiched between the capstan 10 and the magnetic tape 2 in the axial direction thereof. This eliminates the movement of the magnetic tape 2 in its width direction, that is, the upward and downward movements when the magnetic tape is fed in the square direction and in the reverse direction. As a result, it is possible to prevent the magnetic tape edge from being damaged due to contact with the guide post 9 and guide pin 1a arranged before and after the capstan 10, and also to allow the magnetic tape 2 to run stably.

4 to 6 show other examples of the device of the present invention,
Therefore, in this embodiment, the regulating means 14 in the embodiment of the apparatus of the present invention shown in FIG. 1 is supported swingably. The regulating means 14 includes a roller body 23 that comes into contact with the outer peripheral surface of the pinch roller 11 when the pinch roller 11 is pressed by the capstan. This roller body 23 is rotatably attached to a shaft 25 provided at the tip of a holding body 24. The base of this holding body 24 is swingably attached to a shaft 26 fixed to the pace 3. This holding body 24
A coil spring 27 is attached to the shaft 26 of. One end of this coil spring 27 is locked to the shaft 25, as shown in FIGS. 4 and 5, and the other end is locked to the support shaft 8A. With this configuration, the regulating means 14
The roller body 23 constituting the roller body 23 comes into contact with the pinch roller 11 by the spring force of the coil spring 27, as in the embodiment shown in FIG. 1, and can suppress the tilting of the pinch roller caused by changing the tape running mode. Further, according to this embodiment, when pressing the vinyl roller 11 against the cab stun 10, the roller body 23 is able to retreat while contacting the outer peripheral surface of the via fo roller 11. , the pressing force of the pinch roller 11 against the capstan 10 is not reduced, and the control of positioning accuracy of the roller body 23 can be relaxed.

In the embodiment described above, the roller bodies 19 and 23 constituting the regulating means 14 are connected to the capstan 10 and the pinch roller 1.
Although the roller bodies 19 and 23 are arranged on a line substantially perpendicular to the line connecting the axes of the capstan 10 and the pinch roller 11, the arrangement of the roller bodies 19 and 23 is not limited to this. It can be placed anywhere if there is one. Further, the number of roller bodies 19.23 is not limited to one, but it is also possible to use a plurality of roller bodies.

As detailed above, according to the present invention, even if the tape running mode is changed, it is possible to prevent the pinch roller from tilting in the tape running direction, thereby improving the unstable running of the tape caused by this. can.

As a result, the image quality during reverse playback can be significantly improved.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an embodiment of the magnetic recording/reproducing apparatus of the present invention, FIG. 2 is a view taken along the arrows -■ in FIG. 1, and FIG. 3 is an illustration of the apparatus of the present invention shown in FIG. A plan view for explaining the operation of the embodiment, FIG. 4 is a plan view showing main parts of another embodiment of the device of the present invention, and FIG. 5 is a plan view of another embodiment of the device of the present invention shown in FIG. 4. A plan view showing an enlarged main part of the example, Figure 6 is the same as in Figure 5.
−■ It is a view from the arrow. ■...Cassette, 2...Magnetic tape, 4...Tape guide tube, 10...Capstan, 11...Pinch roller, 13...Lever, 14...Inclination of pinch roller Regulating means, 19.23...Roller body. Y l Figure 2 Figure J Laugh 3 Figure 4 Figure 23 87cI- $60

Claims (1)

[Claims] 1. Magnetic recording in which a magnetic tape is driven to run in forward and reverse directions by a rotationally driven capstan and a pinch roller that is rotatably supported by a bearing and is pressed against the capstan. The playback device is characterized in that the base of the magnetic recording and playback device is provided with means that comes into contact with the pinch roller when the pinch roller is completely suppressed by the capstan to regulate the inclination of the pinch roller in the tape moving direction. A magnetic recording and reproducing device. 2. The means for regulating the inclination of the pinch roller is arranged at a position where the means and the capstan are in contact with the outer peripheral surface of the pinch roller at a distance that is smaller than the outer diameter of the pinch roller. A magnetic recording and reproducing device according to claim 1. 3. The means for regulating the inclination of the pinch roller is constituted by a roller body rotatably provided on the base of the magnetic recording/reproducing device so as to contact the outer peripheral surface of the pinch roller. The magnetic recording and reproducing device described in . 4. The means for regulating the inclination of the pinch roller is composed of a rotatable roller body that contacts the outer peripheral surface of the pinch roller, and a holder that supports the roller body so as to be able to swing toward the pinch roller. A magnetic recording and reproducing device according to claim 2, characterized in that: