JPS6364823B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a recording carrier loading device in a recording or reproducing apparatus using a disk-shaped rotating recording carrier such as a rotating magnetic sheet. The object of the present invention is to provide a means for obtaining a smooth loading operation regardless of positional errors.

Prior Art In a recording or reproducing device using a disc-shaped rotating record carrier, such as a rotating magnetic sheet, the magnetic sheet is attached to a center core, and this center core is fitted into a spindle that is connected to a rotation drive unit such as a sheet rotation motor. The record carrier is being loaded.
In this type of device, if the fit between the center core and the spindle is loose, the magnetic sheet will not rotate normally during recording or reproducing operations, and conversely, if the fit is tightened, the two will not fit together smoothly. The problem arises that they do not match.

Therefore, as will be described later with reference to FIG. 2, an apparatus has been proposed in which a magnetic material is fixed to the center core, a magnet is attached to the spindle, and the two are coupled by magnetic force. However, even in this type of magnetic coupling device, when the center core is attached to the spindle, it is ensured that the center core is positioned on its reference plane (for example, the flange surface 8a of the spindle 8 in FIG. 4 described later). Therefore, it is difficult to hold the magnetic sheet on a predetermined mounting surface to maintain a predetermined contact between the magnetic sheet and the recording or reproducing head. In addition, in still image recording or playback devices that require strict mounting accuracy, a force of about 100 grams is required to attach the center core to the spindle, so the magnet becomes large and hinders the ability to make the device smaller and lighter. Become.

Furthermore, as in floppy disk devices, devices have been proposed in which a mechanism is provided on the top surface of the center core to press the center core against the spindle.
(For example, JP-A-50-91306, JP-A-54-31718, etc.) In this device, during recording or reproduction, the sheet rotation drive unit rotates while the above-mentioned mechanism remains pressed against the spindle. Therefore,
The drawback is that the load becomes large and causes uneven rotation.

The applicant first provided a biasing member for attaching the center core of the record carrier to the rotational drive unit,
Regarding a device that operates this biasing member in conjunction with the loading operation of a record carrier, and a device that operates this biasing member to attach it to the center core, and then controls the biasing member to be detached from the center core. (Patent application No. 58-50037). By these means, it is possible to accurately attach the record carrier to the rotary drive unit with a simple configuration, and thereby the contact state between the record carrier and the recording or reproducing head can be maintained in a predetermined state, and the record carrier can be maintained in a predetermined state. Alternatively, during the regeneration operation, the rotational drive section is not loaded with a biasing member or the like, so that the rotational drive section can be made smaller.

However, even in these devices, there is a reaction force from the center core due to errors in the shape of the members constituting the operating mechanism of the biasing member and errors in the position of the rotating shaft among these members. If it exceeds the limit, the smooth biasing operation of the biasing member may be hindered.

In the above patent application, there is provided a device for smoothly performing a loading operation by imparting elasticity to at least a portion of the biasing member so that the biasing member is deflected when the reaction force from the center core exceeds a certain limit. However, the present invention proposes a device that more reliably and smoothly performs loading using a simpler mechanism.

OBJECTS OF THE INVENTION Therefore, the present invention is capable of accurately attaching the center core of a record carrier to a rotary drive unit, and maintaining a predetermined state of contact between the rotary record carrier and a recording or reproducing head. When attaching the center core to the rotation drive unit by operating the biasing member for biasing the center core in the direction of the record carrier mounting surface, or when detaching the biasing member from the center core, the biasing member or its operating mechanism Regardless of shape errors or positional errors of the components that make up the
It is an object of the present invention to provide a record carrier loading device that can reliably realize a smooth loading operation using a simple mechanism.

Structure of the Invention The present invention provides a biasing member (in a specific example described later, for example, , arm 2 in Fig. 3
3) and a control means for activating the biasing member to attach the center core to the rotary drive unit (also a control means for driving the arm 23 so that the end 23a of the arm 23 presses the center core 3). and a release means (for example, a cam 26, a lever 29) that releases the pressing force of the urging member against the center core when the reaction force that the urging member receives from the center core exceeds a predetermined value. Features a loading device.

In the above, the citation of the specific examples described later does not limit the scope of the present invention in any way, and the embodiments of the present invention can be modified as appropriate within the scope of the claims.

In this invention, the record carrier refers to a disc-shaped rotatable record carrier in a magnetic, optical, or capacitive recording or reproducing system, and the record carrier rotation drive unit refers to a drive source such as a motor or a drive source thereof. Refers to transmission members such as coupled spindles.

With reference to the drawings below, a conventional record carrier loading device,
The structure and operation of the first embodiment of the record carrier loading device according to the present invention will be explained in detail in the same order as the second embodiment. The following description is given for an example in which the record carrier is a magnetic sheet.

Conventional Record Carrier Loading Device (FIGS. 1 and 2) Prior to explaining the conventional record carrier loading device, a known magnetic sheet jacket shown in FIG. 1 will be explained. In the figure, 1 is a magnetic sheet, and 2 is a jacket in which the magnetic sheet 1 is housed, and is made of a box-shaped frame as shown. 3 is magnetic sheet 1
4 is an opening into which a spindle, which will be described later, is inserted, and 5 is an opening into which a magnetic head, which will be described later, is inserted. The magnetic sheet 1, housed in the jacket 2, is loaded into a recording or reproducing apparatus by means described later, for example, and recording or reproducing is performed in a known manner.

FIG. 2 is an exploded sectional view of a conventional record carrier loading device, in which a state in which a jacket 2 is loaded is shown by a chain double-dashed line. In the drawings, members indicated by the same reference numerals as in FIG. 1 have the same configuration and function as the members in FIG. Regarding other members, 6 is an internal chassis of the recording or reproducing device, 7 is a seat rotation motor attached to the chassis 6, and 8 is a seat rotation motor 7.
spindle. The aforementioned center core 3 is for attaching the magnetic sheet 1 to the spindle 8 with high precision. 9a is a head chip of a magnetic head which is a recording or reproducing head, and 9b is a mounting portion thereof. 10 is a magnetic body fixed to the lower surface of the center core 3, and 11 is a magnet attached to the upper surface of the flange of the spindle 8. Conventionally, the center core 3 and the spindle 8 were magnetically coupled by these. However, with this device,
As mentioned above, it is difficult to maintain the magnetic sheet 1 on a predetermined mounting surface, and the load on the sheet rotation motor 7 increases.

In another conventional example in which a mechanism is provided on the upper surface of the center core 3 to press it against the spindle 8, the seat rotation motor 7 also rotates using these mechanisms as a load, as described above. increases, causing uneven rotation.

Structure of the first embodiment of the record carrier loading device according to the present invention (FIGS. 3 to 5) FIG. 3 is a sectional view showing the first embodiment of the record carrier loading device according to the present invention; 5 and 5 are explanatory diagrams of the operation.

In these figures, members having basically the same configuration and function as those in FIGS. 1 and 2 are as follows:
Since they are indicated by the same reference numerals as in FIGS. 1 and 2, their explanation will be omitted. Reference numeral 21 denotes a jacket holder, and the magnetic sheet jacket 2 is inserted into the holder, loaded onto the rotational drive section, and taken out of the apparatus from the holder. A plurality of support parts 22 for the jacket 2 are provided on the chassis 6, but these may be constructed integrally with the chassis 6 or may be constructed separately. Reference numeral 23 denotes an arm which is an example of a biasing member in the present invention, and is configured to be rotatable about a shaft 24. The shaft 24 is attached to a chassis 25 that is configured integrally with the chassis 6 or separately. 23a is the bent end of the arm 23, as shown in FIG.
3 in the clockwise direction, the center core 3 is pushed into the spindle 8 at the end 23a. For this purpose, for example, two knife-edge-shaped end portions 23a may be provided, and the front side of the page of FIG. may be provided and pressed by the end portion 23a at its center position.

23b is an elongated hole provided in the arm 23, into which the shaft 24 is fitted. Further, the arm 23 is biased in the R direction in the figure by a spring 28, and therefore,
Normally, the shaft 24 is located at the left end (FIG. 3) of the elongated hole 23b. Note that the other end of the spring 28 is fixed to the chassis. 26 is a cam fixed to the arm 23, with a slit and a screw 27 cut therein.
Its position is adjustable. Although the slit and screw 27 are shown assembled in the figure,
The number is not limited. Reference numeral 29 denotes a lever which is rotatable about the center of a shaft 30 mounted on the chassis 25, and when the lever is rotated in the counterclockwise direction (direction C in FIG. 4), its end 29a comes into contact with the cam surface 26a. Clockwise from below (direction D in Figure 5)
When rotating, the end portion 29a comes into contact with the cam surface 26b. Reference numeral 31 denotes a pin mounted on the lever 29, and is fitted into a long hole 21a provided in the jacket holder 21. 32 is a spring that rotates the arm 23 in the counterclockwise direction, and 33 is a positioning portion that regulates the rotation of the arm 23 in the counterclockwise direction.

The operation of the first embodiment of the record carrier loading device according to the present invention (FIGS. 3 to 5).

In the above configuration, the magnetic sheet jacket 2
Insert the jacket into the jacket holder 21, and then
1 in the direction A in the figure. To do this, for example, the holder 21 may be connected to the main body of the apparatus or its lid by a hinge provided on the back side of the paper in FIG. 3, and the holder 21 may be lowered by manual operation or by some kind of driving means. As the holder 21 descends, the pin 31 that fits into the elongated hole 21a moves in the direction A, which causes the lever 29 to rotate in the direction C in FIG. Therefore, the end 29a of the lever 29 comes into contact with the cam surface 26a, and since the cam 26 is fixed to the arm 23, the arm 23 rotates clockwise around the shaft 24, and the end 23a
Press center core 3 with
Push it into. In this case, the distance l between the lower surface of the center core 3 and the flange surface 8a of the spindle 8 is shown in FIG.
shall be adjusted so that it becomes zero. Since the center core 3 is usually made of plastic,
There is a large variation in the inner diameter when fitting with the spindle 8, but according to the above-mentioned configuration, by designing the inner diameter to be smaller, it is not affected by the variation, and is therefore suitable for mass production. become.

When the jacket holder 21 further descends in the direction A, the end portion 29a continues to rotate in the direction C in FIG.
6 is disengaged. When the two are disengaged, the arm 23 is rotated in the direction B by the spring 32, and its position is regulated by the positioning part 33. As the arm 23 rotates, its end 23a separates from the center core 3, so no extra load is applied to the seat rotation motor 7, which is the rotation drive source, and the center core 3 and spindle 8 are strengthened by friction. The magnetic sheet 1 rotates, and recording or reproduction is performed by the magnetic sheet 9a.

By the way, the arm 23 and the end 29 of the lever 29
Even if the end 23a of the arm 23 pushes the center core 3 into the spindle 8, the end 29a of the lever 29 may The cam surface 26a and the cam surface 26a may not be separated from each other, resulting in so-called twisting between the two, which may impede smooth loading operation. In contrast,
In the above device, a long hole 23b is provided in the arm 23,
Since this is configured to fit into the rotation shaft 24, when the reaction force from the center core 3 exceeds a certain limit, the arm 23 moves against the biasing force in the R direction by the spring 28, and The positional relationship between the rotary shaft 23b and the rotation shaft 24 is as shown in FIG. Therefore, the end 29a of the lever 29 and the cam surface 26a are smoothly separated, and the arm 23 immediately rotates in the direction B, so that the magnetic sheet 1 can be loaded smoothly.

After the recording or reproducing operation is completed, the jacket holder 21 is raised in the B direction by performing the reverse operation of lowering the jacket holder 21 in the A direction. This state is shown in FIG. Due to this upward movement, the pin 31, and thus the lever 29, rotates about the shaft 30 in the direction D in the figure, and its end 29a now comes into contact with the cam surface 26b from below in the figure. In this case as well, arm 2
3 moves to the left in the figure against the bias of the spring 28, the end 29a of the lever 29 and the cam surface 26b smoothly separate, and return to the initial position shown in FIG.
In this state, the jacket 2 is taken out from the holder 21.

A second embodiment of the record carrier loading device according to the present invention (FIG. 6).

FIG. 6 shows a second embodiment of the record carrier loading device according to the present invention, which uses a toggle spring mechanism to activate the device when the reaction force from the center core against the biasing member exceeds a certain limit. The biasing member is configured to escape in a direction different from the biasing direction. Figure 6A shows a state in which the biasing member is pressing the center core, Figure 6B shows a state in which the biasing member escapes due to the reaction force from the center core, and Figure C shows the biasing member in its initial position. The returned state is shown, and these figures only show the main parts.

In these figures, the biasing member includes a base portion 41 and a movable portion 42, and the movable portion 42 is rotatable about a shaft 43 that is erected on the base portion 41. 4
Reference numeral 2a denotes a bent end portion of the movable portion 42, which functions to press the center core in the same manner as the end portion 23a of the arm 23 shown in FIG. 44 is a toggle spring, one end of which is fixed to a support part 45 provided on the base 41, and the other end fixed to a protrusion 46 provided on the movable part 42. Note 4
Reference numeral 7 denotes a position regulating pin of the movable portion 42, which is implanted in the base portion 41. A pin 48 is embedded in the base 41 and is fitted into the long hole 21a of the jacket holder 21. Other members indicated by the same symbols as in FIG. 3 have the same structure and function as those in FIG. 3, and the center core 3, spindle 8, jacket 2, magnetic heads 9a, 9b, etc. in FIG. 3 are shown here. Although illustration is omitted here, the structure and arrangement are the same as in FIG. 3.

In the above configuration, as the jacket holder 21 descends in the direction A in the figure, the pin 48 implanted in the base 41 descends, and the base 41 and the movable part 42 also rotate clockwise about the shaft 24. , the bent end portion 42a of the movable portion 42 presses the center core and pushes it into the spindle. If the reaction force from the center core is below a certain limit, the toggle spring 44
is in the first stable position, and the movable part 42 is in the base 41
In contrast, the position shown in FIG. 6A is maintained. base 4
1 and the movable part 42 further continue to rotate and when the reaction force from the center core exceeds a certain limit, the toggle spring 44 is shifted to the second stable position as shown in FIG. rotates relative to the base 41, and the biasing member acts to escape in a direction different from the biasing direction. Therefore, the tip bent portion 42
Since a is separated from the center core, a stable loading operation can be realized. Recording or playback ends,
When the jacket holder 21 is raised in the direction B in the figure, the biasing member returns to the initial position shown in C in the figure.

In an embodiment of the record carrier loading device of the present invention, a clip mechanism may be used in place of the above-described toggle spring mechanism to achieve the same function.

Effects of the Invention As described in detail above, according to the present invention, the center core of the record carrier is provided at a position facing the record carrier rotation drive unit with the record carrier in between, and presses the center core of the record carrier against the record carrier rotation drive unit. a biasing member to actuate the biasing member to attach the center core to the rotation drive unit; Since the structure is equipped with a release means for releasing the pressing force of the biasing member against the center core, the simple mechanism allows A reliable and smooth loading operation can be realized.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a known magnetic sheet jacket, FIG. 2 is an exploded sectional view of a conventional record carrier loading device, and FIG. 3 is a sectional view of a first embodiment of the record carrier loading device according to the present invention. , FIGS. 4 and 5 are explanatory diagrams of the operation of the apparatus shown in FIG. 3 when the jacket holder is lowered and raised, respectively, and FIGS. 6A, B, and C show the loading of a record carrier according to the present invention. The main parts of the second embodiment of the device are shown. Figure A is a sectional view of the biasing member in a state where it is pressing the center core, and Figure B is a sectional view of the biasing member receiving a reaction force from the center core. Cross-sectional view of escape state, same figure C
FIG. 2 is a cross-sectional view of the biasing member returned to its initial position. In the figure, 1 is a magnetic sheet which is a recording carrier, 2 is a jacket, 3 is a center core, 7 is a sheet rotation motor, 8 is a motor spindle, 21 is a jacket holder, 23 is an arm, 23a is its end, 23
24, 30, 31 are shafts, 26 are cams, 28, 32 are springs, 29 are levers, 29a are ends thereof, 41 is the base of the biasing member, 42 is the movable part of the biasing member , 44 indicates a toggle spring.

Claims (1)

[Scope of Claims] 1. A biasing member that is provided at a position facing the record carrier rotation drive unit with the record carrier in between and presses a center core of the record carrier toward the record carrier rotation drive unit; and the biasing member. control means for activating the center core to attach the center core to the rotational drive unit; and controlling the urging member to press against the center core when the reaction force that the urging member receives from the center core exceeds a predetermined value. A record carrier loading device comprising: a release means for releasing the release;