JPS5860451A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To position and clamp a magnetic disk cassette securely by allowing the magnetic disk cassette to be attached and detached on the front side of a device. CONSTITUTION:When an operation lever 38 is turned as shown by an arrow A, the middle part of the lever 38 moves along the bevel of a cam hole 37 to be fitted in a long-sized hole 37a. As a result, the pin side 34 of a cam lever 35 is further lowered and a center cone guide 15 is also further lowered, so that a center cone 22 clamps the circumferential edge of the circular hole of a magnetic disk 11a securely with a spindle 40. At this time, the pressing force depends upon the pressing force of a gimbals spring 21. The operation lever 38 is fitted in the long-sized hole 37a and held locked unless an external force is applied, so that the magnetic disk 11a is clamped while centered securely.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic recording and reproducing device, and more particularly to a magnetic recording and reproducing device that is effective when applied to a sheet-shaped magnetic recording medium called a magnetic disk.

A magnetic disk, which is a sheet-shaped magnetic recording medium, is housed in a magnetic disk cassette 1 as shown in FIG. This magnetic disk cassette 1 is molded from cardboard, synthetic resin, or the like, and a magnetic disk 2 is housed inside. The magnetic disk 2 has a circular hole 2a in its center, and the magnetic disk cassette 1 has an opening 3 having a diameter one size larger than the circular hole 2a. An index hole 4.4 is sandwiched between the opening 3 called the center hole.
A head window 5 into which a magnetic head is fitted is further formed.

Conventionally, a mechanism for mounting a magnetic disk cassette having such a structure into a magnetic recording device is, for example, @
The mechanism shown in Figure 2 was adopted.

(3) That is, what is indicated by reference numeral 6 in FIG. 2 is a base, which is formed in the shape of a casing with an open top, and is fixed to the side of a magnetic recording/reproducing device (not shown).

A holder 8 is rotatably supported on the inner end of the base 6 via a shaft 7. A center cone 9 for positioning and clamping the magnetic disk 2 via the magnetic disk cassette 1 is provided in the holder 8, and a spindle 10 is provided on the pace 6 side facing the center cone 9. The spindle 10 is constantly rotated by a drive device (not shown) provided on the side of the magnetic recording/reproducing device.

In such a structure, conventionally the front side of the holder 8 is left open and the magnetic disk cassette 1 is
Close the holder 8 with the holder 8 fitted along the holder 8,
The magnetic disk 2 is clamped between a center cone 9 and a spindle 10 and rotated at a predetermined speed to perform magnetic recording and reproduction.

However, if such a structure is adopted, the amount of movement of the holder 8, which is the operation part, is large compared to the minimum required movement of the center cone 9, which is the clamping member, and the spindle 10, and the height of the entire device becomes large. There was a drawback.

In addition, since the holder 8a operates by rotation and not by vertical movement, it is difficult to center the magnetic disk and equalize the clamping pressure, which tends to cause problems such as scratching the magnetic disk or causing the magnetic disk to slip. .

The present invention has been made in order to eliminate the above-mentioned drawbacks of the conventional technology, and it is possible to minimize the amount of movement of the operating section, downsize the entire device, and to clamp the magnetic disk with high precision. It is an object of the present invention to provide a magnetic recording/reproducing device configured to enable the following.

In order to achieve the above object, the present invention is configured such that the magnetic disk cassette can be attached and removed from the front side of the device, and the magnetic disk can be moved perpendicularly to the reference plane of the device to clamp the magnetic disk. It was configured as follows.

Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.

Figure 3 and the following diagrams explain one embodiment of the present invention.
Figures (A) and (B) and Figure 4 (A) and (Bl) show the state before the magnetic disk cassette 11 is inserted.

In both figures, the reference numeral 12 denotes a chassis, which is formed as a housing as a whole, and has an opening 14 formed in its front panel 13 for inserting a cassette.

A center cone guide 15 having a substantially U-shaped cross section is housed within the chassis 12. As is clear from FIG. 3(B), this center cone guide 15 is formed in a U-shape that is open downward.
In the both side plates 15a, long holes 16 are formed in the vertical direction in a heated state by a predetermined distance in the width direction, as shown in FIG. 4fB]. Further, a leaf spring 17 is fixed to the upper surface of the center cone guide 15. The leaf spring 17 is formed into a flat V-shape, and its center portion is fixed to the upper surface of the center cone guide 15 by a screw 18.

A plate spring 19 is fixed to the lower surface of the center cone guide 15 for holding down a cassette guide, which will be described later. This leaf spring 19 is formed into a flat inverted V-shape as shown in FIG.

Further, a gimbal spring 21 is provided on the lower surface of the center cone guide 15, and a center cone 21 is provided on the lower surface of the cassette guide 15 below this gimbal spring 21.
2 is fixed. The center cone guide 15 having such a structure is fitted into an elongated hole 24 formed vertically in the chassis 12 via pins 23 protruding from both side plates 15a. Can be moved.

This elongated hole 24 is shown in FIG. 4 (A+, (Bl).

On the other hand, inside this center cone guide 15, a cassette guide 25 is arranged in a horizontal state. The cassette guide 25 has two upper and lower side plates 25a.

25b, of which (7) a pin 26 protruding from a side plate 25c protruding downward from the central portion is slidably fitted into the elongated hole 16. It is guided along the elongated hole of the center cone guide 15 in this state.

At the inner end of the upper side plate 25a of the cassette guide 25, a claw 27 for positioning the cassette is provided to protrude downward.

On the other hand, a cassette detection lever 2 is located deep inside the chassis 12.
8 are rotatably connected to each other via a pin 29, and the free end, which is the upper end, faces slightly forward of the claw 27.

A spring 30 is stretched between the cassette detection lever 28 and the side wall of the chassis 12, and before the cassette is inserted, the cassette detection lever 28 is maintained in an almost vertical state as shown in FIG. .

A link lever 31 is provided near the cassette detection lever 28, as shown in FIG. 8), and the other end is connected to the upper end of the lock arm 32. The lower end of the lock arm 32 is rotatably supported on the side plate of the chassis 12 by a pin 33, and the upper end is connected to the side plate of the chassis 12 via a pin 31b. The upper end of the lock arm 32 is connected to the link lever 31.
A notch 32a is formed on the 3 side, and this notch 3
A pin 34 is engaged with 2a.

The aforementioned link lever 31 and lock arm 32 are provided in pairs on both left and right sides of the chassis 12.

The pin 34 protrudes from the tip of the cam lever 35, and the pin 34 is fitted into a vertical long hole 36 formed in the side plate of the chassis 12 so as to be able to move up and down. 15a. The cam lever 35 is formed as a cylindrical frame when viewed from above, and is rotatably supported at a position near the front panel 13 through a shaft 35b. A cam hole 37 is formed in the front plate 35a of the cam lever 35.

As shown in Figure 3 (Bl), the cam hole 37 has a parallelogram shape with the top and bottom sides horizontal and the left and right sides slanted.
In FIG. 3fB), a long hole 37a is continuous at the lower left end, and a long hole 37b is continuous at the upper right end.

On the other hand, a control lever 38 is provided with a knob 38a at its outer end, and its inner end passes through the cam hole 37 and is inserted into the chassis 17 by a screw 3.
9, it is rotatably supported.

Reference numeral 40 denotes a spindle for transmitting rotation, and is provided with its axis aligned with the center cone 22.

A magnetic head 41 is provided at the inner end of the cassette guide 15, and a tape pad 42 is provided near the magnetic head 41.

The reference numeral 43 indicates a stepping motor.

44 is a drive motor.

Next, the operation of this embodiment configured as above will be explained.

Before the magnetic disk cassette 11 is installed, the operating lever 38 is rotated in the direction of the arrow shown by the symbol B in FIG. There is. In this state, the tip of the cam lever 35 moves upward, the pin 34 moves upward in the elongated hole 36, and is locked in the notch 32a of the lock lever 32. The link lever 31 is in a horizontal state, and the cassette detection lever 28 is in a vertical state.

At this time, the center cone guide 15 integrated with the pin 34 has also been raised, and is located at the upper limit with the plate spring 17 being bent. As the center cone guide 17 rises, the pin 26 comes into contact with the lower end of the elongated hole 16 and is raised together with the center cone guide 15 to be located opposite the opening 14.

In this state, when the magnetic disk force set 11 is fitted through the opening 14, the magnetic disk cassette 11 is inserted!・
It is guided through between the upper and lower side plates 25a and 25b (11) of the guide 25, and first comes into contact with the upper end of the cassette detection lever 28, and as shown in FIG.
Rotate 8 counterclockwise. As a result, spring 3
The link lever 31 is pulled to the left against a tensile force of 0, the lock lever 32 is rotated counterclockwise, and the notch 32a is rotated counterclockwise.
The pin 34 will come off.

Then, the center cone guide 15 is first suddenly pushed by the force of the spring 17, the pin 34 is also lowered, and furthermore, the weight of the center cone guide 15, center cone 40, etc. (secondarily, the entire center cone guide 15 is lowered). As a result, the cam lever 35 is also rotated counterclockwise as shown in FIG. 6. As the center cone guide 15 descends, the cassette guide 25 becomes free and is guided through the elongated hole 16 by the pin 26 and vertically moved. At the same time, the cassette guide 25 is pushed by the pressing force due to the weight of the entire cassette guide 15, and is set almost on the reference surface.

(12) At this time, the center cones 22 whose axes are aligned with each other
begins to mate with the spindle 40 as shown in FIG.

However, since the cassette guide 25 that has reached the reference plane does not descend below that level, the elastic force of the leaf spring 19 acts as a force to lift the center cone guide 15, and the center cone 22 and spindle 40 are not in contact with each other. It is in a state where there is no.

At this time, the magnetic disk 11a housed in the axial disk cassette 11 is in a temporarily positioned state.

In this state, when the operating lever 38 is rotated in the direction of arrow A in FIG. As a result, the pin 34 side of the cam lever 35 is further lowered, the center cone guide 15 is also further lowered, and the center cone 22 is positioned between the spindle 40 and the periphery of the circular hole of the magnetic disk 11a. The pressing force at this time is determined by the pressing force of the gimbal spring 21.The operating lever 38 is connected to the long hole 3.
7a, but the operating lever 38 remains locked unless an external force is applied, and the magnetic disk 11a is clamped in a securely centered state.

Incidentally, this clamped state may be configured to be securely fixed by providing a clamp lock lever (not shown) or the like.

If you wish to take out the magnetic disk cassette 11 after the recording and reproducing process of information on the magnetic disk is completed, contrary to the above-mentioned operation, rotate the operating lever 38 in the direction of arrow B in Figure 3. Since the operating lever 38 is fitted into the elongated hole 37b formed on the right side of the upper end of the cam hole 37,
The cam lever 35 is rotated clockwise as shown in FIG. 4(B), and as a result, the center cone guide 15 is raised. Then, the cassette guide 25 is also raised, and when the cassette guide 25 and the opening 14 are facing each other,
The force of the spring 30 returns the cassette detection lever 28 to the vertical position, and the leading end of the magnetic disk cassette 11 within the cassette guide 25 is pushed out from the opening 14.

All you have to do is grasp this pushed-out end and pull out the magnetic disk cassette 11.

As is clear from the above description, according to the present invention, the center cone and spindle are arranged so that their axes align and can be moved toward and away from each other, and the cassette guide can be moved to the reference white in conjunction with the movement of the center cone. Since the magnetic disk cassette can be automatically ejected, it is possible to obtain a magnetic recording PJ production device that can reliably position, clamp and eject the magnetic disk cassette in a series of operations. Density, especially track density, can be improved.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a magnetic disk cassette, and FIG. 2 is a side view illustrating a conventional magnetic disk cassette clamp device. Figure 3 and the following diagrams explain one embodiment of the present invention.
Figure (Al, (B) is a plan view and front view, Figure 4 (A)
. (15) (Bl is a side view and vertical rice resistance diagram before the cassette is attached, Figure 5 is a partially enlarged cross-sectional view showing the state immediately before clamping, and Figure 6 is a longitudinal side view showing the clamped state. 11. ...Magnetic disk cassette 12...Sharn 1
4. Opening 15. Center cone guide 1
7.19... Leaf spring 21... Gimbal spring 22... Center cone 25... Cassette guide 28... Cassette detection lever 31... Link lever 32... Lock lever 35... Cam lever 37...
Cam hole 38...Operation lever 40...Spindle. Patent applicant Canon Electronics Co., Ltd. agent Patent attorney Takashi Kato (16) 301 Figure 3 (A) 44 43 12 Third cause (
B) 35 37a 37

Claims (6)

[Claims] (1) A magnetic recording and reproducing device that clamps a magnetic disk using a center cone and a spindle, and is characterized in that the magnetic disk cassette can be attached and removed from the front side of the device. (2) Magnetic recording according to claim 1, characterized in that the magnetic disk is configured so that it can be moved and clamped in a direction perpendicular to the mounting reference surface of the disk in conjunction with a center cone. playback device. (3) Center cone and spindle! : is arranged on the same axis M and is configured to be movable linearly with respect to the spindle in conjunction with a cassette guide that guides a mounted magnetic disk gusset. 2. The magnetic recording and reproducing device according to item 2. (4) A cassette detection lever is provided on the inner back side of the cassette guide, a lock lever is provided that interlocks with the cassette detection lever, and a cam lever is provided for operating the lock lever and the center cone guide that supports the center cone; Claims 1 to 3 are characterized in that the center cone is locked in a predetermined position and the lock lever is set and reset by operating the cam lever from the outside. The magnetic recording/reproducing device according to any one of the items. (5) The magnetic recording and reproducing apparatus according to claim 4, wherein the cassette detection lever is provided with a rotational habit by a spring in a direction in which the cassette can be ejected. (6) A gimbal spring is used as a pressing means when a magnetic disk housed in a cassette is clamped by a center cone.
The magnetic recording/reproducing device according to any one of items 5 to 5.