JPS6011387B2 - Drive device for magnetic recording and playback equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a drive device for a magnetic recording/reproducing machine.

Conventionally, in a spiral type magnetic recording/playback machine that records and plays by moving a magnetic head installed on a rotating turntable in the radial direction and moving the head relative to a magnetic sheet, conventionally, the turntable is A driving source was provided externally.

Therefore, there is a drawback that the space on the turntable cannot be used effectively, and since the turntable is lightweight and has a slow rotation speed, the flywheel effect of the turntable is small, resulting in uneven rotation. SUMMARY OF THE INVENTION An object of the present invention is to provide a drive device for a magnetic recording/reproducing machine that eliminates the conventional drawbacks by providing a drive section on a turntable.

Hereinafter, the present invention will be explained with reference to the embodiments shown in the drawings. In FIG. 1, a turntable 1 is rotatably mounted on a central shaft 3 fixed to an immovable base plate 2 (see FIG. 2), and a helical gear 4 is fixed to the central shaft 3.
A helical gear 6 fixed to the guide shaft 5 meshes with the guide shaft 5.

A feed screw 7 is provided on the guide shaft 5, and each end of the guide shaft 5 is supported by brackets 8 and 9 fixed to the turntable 1. A rotating shaft 11 parallel to the guide shaft 5 is arranged on the back side of the turntable 1, and each end of the rotating shaft 11 is pivotally supported by brackets 12 and 13 fixed to the back side of the turntable 1. ing. This rotating shaft 11 has a radius la of the turntable 1.
It is located near and parallel to this. An amplifier 14 is mounted on the front surface of the turntable 1, and batteries 15, 16 and a motor 1 are mounted on the back surface as shown in FIG.
7 are fixed to each other, and these are adjusted and arranged so as to enhance the flywheel effect of the turntable 1 and eliminate variations in weight. motor 17
The output shaft 17a is a pulley 1 fixed to the rotating shaft 11.
8 and belt 13, and pulley 18
A part of the turn tape extends upward through a hole lb made in the turn tape. A portion of the bending portions 21a and 21b of the moving table 21 (see FIG. 1) fit into the hole l of the turntable 1.
b, and is slidably attached to the rotating shaft 11, and the bent portion 21a is further slidably attached to the guide shaft 5. A magnetic head 22 is mounted on the movable table 21 so as to be movable up and down, and is biased upward by an extensible spring 24 as shown in FIG. The magnetic head 22 is in pressure contact with the magnetic surface of the sheet 25, which is pressed by a pressing plate (not shown). In FIG. 1, the feed lever 26 has its base pivotally connected to the movable table 21 by a shaft 27, and a half nut is provided at the free end of the feed lever 26 and engages with the feed screw 7. Mobile platform 2
A first lever 28 is pivotally attached to the bent portion 21b of the first lever 28 with a shaft 29, and a base of a second lever 31 is pivotally attached to the free end of the first lever 28 with a shaft 32. A drive roller 33 is pivotally attached to the free machine by a shaft 34.

The chest or shaft 34 of the drive roller 33 is oriented toward the central axis 3 as shown in FIG. The elasticity of the drive roller 3
3 is pressed against the rotating shaft 11 and the base surface 2a of the substrate 2, respectively. In the device configured in this manner, when the output shaft 17a of the motor 17 rotates in the direction of the arrow in FIG. As a result, the drive roller 33 rotates counterclockwise as indicated by the arrow and rolls on the base surface 2a.

That is, the turntable 1 rotates in the clockwise direction indicated by the arrow in FIG. The rotation of the turn tape causes the hem Calgary 6 and the feed screw 7 that is substantially integral therewith to rotate, so that the feed lever 26
The movable table 21 moves toward the central axis 3 via the.
Due to this movement of the moving table 21, the drive roller 33 attached thereto is moved around the rotating shaft 11 while remaining in pressure contact with the rotating shaft 11.
The magnetic head 22 slides on the top and gradually approaches the central axis 3, and the magnetic head 22 makes a spiral motion to perform recording and playback. By the way, the turntable 1 generally rotates at a constant speed, and in this case, the relative speed of the magnetic head 22 with respect to the sheet 25 is farther when the magnetic head 22 is located on the outer periphery of the turntable 1, and The closer the position is to the inner periphery, the slower the speed becomes, and the space efficiency of the seat decreases.

In this regard, in the above drive device, the vibration roller 33 rotates at a constant speed, but when the drive roller 33 is located on the outer periphery, its rolling radius is large, so the rotation speed of the turntable 1 is small. , and as the drive roller 33 moves toward the inner circumference, the rotational speed of the turntable 1 gradually increases. Since the magnetic head 22 moves in the radial direction together with the driving low foot 33, the sheet 26
The relative speed of the magnetic head 22 relative to the magnetic head 22 can always be kept constant. If this relative velocity is constant and not 0,
As shown in FIG. 4, the drive loft 33 may be separated from the movable table 21 and supported separately. That is, the first lever 28
The base of the turntable I is pivotally connected to a bracket 42 by a shaft 41, and this bracket 42 is fixed to the back side of the turntable. rotates at a speed of In the above embodiment, the driving roller 33 is rolled on the base surface 2a of the substrate 2, but the sheet 25
Since the base surface (that is, the magnetic surface) is also perpendicular to the central axis 3, the turntable 1 can be similarly driven even if the drive roller 33 is brought into pressure contact with the sheet 25 and rolled. According to the invention, the motor 17, the battery 1
5, 16 and the amplifier 14 in the turntable blue, and the magnetic heads that are moved in the radial direction as the turntable rotates are placed in the dead space inside the turntable, the space of the turntable 1 is reduced. is effectively used to make the device smaller, and the flywheel effect of the turntable becomes larger, eliminating rotational irregularities. By changing it as it moves, the relative speed between the magnetic head and the recording medium can be kept constant at the position of the magnetic head, that is, the position in the radial direction of the turntable, and as a result, the recording density on the recording medium can be increased. It is possible to always maintain the same state on the outside and inside of the same medium, and the quality of recording and reproduction can be improved.

Further, by providing batteries 16, 16 as power sources and an amplifier 14 for amplifying detected signals on the turntable, electrical connections between the motor 17 and batteries 15, 16 and magnetic head 22 and amplifier 14 can be established. Each connection can be made on the turntable 1, and the slip rings and brushes used to connect the rotating part and the non-rotating part are not needed in the above connection, thereby simplifying the apparatus.

[Brief explanation of drawings]

FIG. 1 is a plan view of a drive device for a magnetic recording/reproducing rock showing an embodiment of the present invention, FIG. 2 is a side view of the same, FIG. It is a side view showing a support mechanism. 1... Turntable, 2... Board,
3...Center sea bream, 11...Rotation axis, 17...
...Motor, 33. ．． ．． ．． ．． ．． Driving Loaf

Claims (1)

[Claims] 1. A turntable that rotates around a central axis provided perpendicular to the substrate, a rotating shaft provided parallel to an arbitrary radius of the turntable, and a rotating shaft that is fixed to the turntable and drives the rotating shaft. A part of the circumferential surface of the motor is in pressure contact with the base surface in a stationary state perpendicular to the central axis and the rotating shaft, and the axis is directed toward the central axis,
A drive roller attached to the turntable, and a drive roller provided on the turntable that rotates as the table rotates.
A drive device for a magnetic recording/playback machine consisting of a magnetic head that is moved in the radial direction of the table.