JPH0690844B2 - Magnetic disk unit - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a magnetic disk device, and more particularly to a magnetic disk device configured so that a magnetic disk can be automatically loaded into and ejected from the device.

2. Description of the Related Art Conventionally, there has been known a magnetic disk device configured so that a magnetic disk can be automatically loaded into and ejected from the magnetic disk device.

A conventional magnetic disk device of this type includes a power source that drives a transfer unit that transfers from an insertion port of a magnetic disk to an access unit that records and reproduces, and a power source that drives a clamp unit that clamps a magnetic disk to a rotation drive mechanism. And were used independently of each other.

The control operation of the conventional structure having such two power sources will be described with reference to FIGS. 1 and 2.

FIG. 1 is a block diagram of the control circuit. In FIG. 1, reference numeral 1 is a control unit, and the control unit 1 includes a magnetic disk insertion detection unit 2, a magnetic disk transfer completion detection unit 3, and a clamp mechanism return detection. The unit 4, the clamp completion detecting unit 5, and the magnetic disk discharge switch 6 are connected.

Further, a motor drive circuit 7 is connected to the control section 1, and a motor 8 for magnetic disk transfer is driven by a command from the motor drive circuit 7, whereby a magnetic disk transfer mechanism section 9 is driven. .

Further, a motor drive circuit 10 on the clamp side is connected to the control unit 1, and a clamp drive motor 11 driven by this motor drive circuit drives the clamp mechanism unit 12.

FIG. 2 is a time chart for explaining the control operation. In the figure, 2s to 6s show signals from the detection unit having the same reference numerals shown in FIG. 1, and 8s and 11s show transfer motor and clamp drive motor. 7 shows the drive timing signal of the.

First, when a magnetic disk is mounted, this is detected by the magnetic disk insertion detector 2 and a detection signal 2s is generated as shown in FIG. 2, and at the same time, the transfer motor 8 starts forward rotation.

When the magnetic disk is transferred into the apparatus and the transfer is completed, the magnetic disk transfer completion detecting unit 3 outputs a detection completion signal.
3s occurs, and the rotation of the transfer motor 8 is stopped by this signal. At the same time, the clamp drive motor 11 starts rotating. When the clamp completion is detected by the clamp completion detecting unit 5, the clamp completion signal 5s is generated, the clamp drive motor 11 is stopped, and the magnetic disk loading operation is completed.

Subsequently, magnetic recording / reproduction is performed, and when the magnetic disk ejection switch 6 is pressed at the time when the magnetic disk is ejected, the clamp drive motor 11 is reversely rotated by this signal and the clamping of the magnetic disk is released. Then, when the clamp mechanism returns to the initial state, the clamp mechanism return detection unit 4 detects this and a return signal 4s is generated,
The clamp drive motor 11 stops and the transfer motor 8 starts reverse rotation to eject the magnetic disk.

Then, the magnetic disk is ejected and the magnetic disk insertion signal
When 2s is turned off, the transfer motor 8 stops and the magnetic disk ejection operation is completed.

If the above-mentioned structure is adopted, since two power sources are used in the magnetic disk device, the control circuit and the control timing become complicated, and the number of parts is large and the device becomes large in size. .

An object of the present invention is to eliminate the above-mentioned conventional drawbacks, and to provide a magnetic disk device configured so that loading / discharging and clamping operations of a magnetic disk can be performed by one driving source. Is intended.

Embodiments FIGS. 3 to 8 show an embodiment of the present invention, in which reference numeral 20 designates a frame of the apparatus, and the left and right sides of the frame 20 are flat U-shaped in cross section. The guides 21 and 22 are formed in a striped shape, and the magnetic disk 23 housed in a flat case is guided along the guides 21 and 22.

The stopper 2 is placed on the frame 20 at a predetermined position between the guides 21 and 22.
4, 25 are provided so as to project and limit the insertion limit of the magnetic disk 23 to be mounted.

Reference numeral 26 denotes a head arm, which is provided on a carriage (not shown) which is moved by a drive mechanism 27 and which moves in the left-right direction in FIG.

Below the head arm 26, a support arm 28 of a center cone having an elongated U-shape is arranged. The base end of the support arm 28 is fixed to the frame 20 side via leaf springs 29, 29, and a center cone 30 is provided on the lower surface on the free end side thereof. This support arm 28 is a leaf spring 29.
Is given a habit of turning upwards.

A front panel is provided on the edge of the frame 20 opposite to the drive device 27.
31 is provided, and a magnetic disk insertion opening is formed on the front panel 31 side.

An upper frame 32 is provided at a position close to the front panel 31 side. A magnetic disk ejection switch 33 is attached to the front panel 31 at a position near one side of the magnetic disk insertion opening.

A motor 34 for automatic loading and discharging is fixed on the upper frame 32 at a position near the discharge switch 33 side, and a worm gear 36 is fixed to an output shaft 35 thereof. The output shaft 35 is rotatably supported by a pair of left and right bearings 37, 37.

A bevel gear 38 is fixed to the outer end of the output shaft 35, and this bevel gear 38 meshes with another bevel gear 39.

The shaft of the bevel gear 39 is arranged so as to be orthogonal to the output shaft 35, and a gear 43 is fixed to the rotary shaft of the end portion on the opposite side of the bevel gear 39. A gear 44 corresponding to the gear 43 is fixed to the shaft 41, and the roller 40 is fixed to the shaft 41. 42 is a bearing of the shaft 41. The gears 43 and 44 mesh with the coupling gear 45.

The coupling gear 45 is rotatably supported on one end of a gear frame 46, and the midway of the gear frame 46 is rotatably supported by a fulcrum 47.

The fulcrum 47 is rotatably attached to the bearing 48.

On the other hand, a worm wheel 49 is rotatably supported via a shaft 50 at a position where it can be meshed with the worm gear 36. As shown in FIG. It works as a toothless gear with no teeth.

Also, on the upper side of the worm wheel 49, there is a fifth shaft coaxial with the shaft 50.
As shown in the figure, the cam 51 has an inclined upper surface.
Are fixed, and the worm wheel 49 and the cam 51 are integrally formed. Then, one end of the gear frame 46 extends while being in contact with the cam 51.

On the other hand, a switching lever 52 is arranged parallel to the output shaft 35 of the motor 34 on the side of the worm wheel 49 opposite to the worm gear 36.
Constitutes the connection regulation means in the present invention. The switching lever 52 has elongated holes 52a, 52b formed in the front and rear in the longitudinal direction thereof, and the guide pins 53, 5 are formed in these elongated holes, respectively.
4 is fitted. These guide pins 53, 54 are provided on the upper frame 32 so as to project therefrom.

Further, a spring 56 is stretched between the end of the switching lever 52 on the front panel 31 side and the projection 55 projectingly provided on the upper frame 32, so that the switching lever 52 always has a front panel.
It gives a habit of moving to the 31st side. A rack gear 57 is formed on the side edge of the switching lever 52 on the worm wheel 49 side over a predetermined distance.

The edge of the switching lever 52 on the drive device 27 side is a bent portion 52c that is bent downward.

On the other hand, what is denoted by reference numeral 58 is a lever, one end of which is in contact with the cam surface of the cam 51 fixed to the upper side of the worm wheel 49, and the other end is a protrusion on the free end side of the support arm 28. It is in contact with the top of the shaft 28a, and in the middle thereof is fixed to a support shaft 60 rotatably supported by a bearing 59.

Below the lever 58, a micro switch 61 for detecting the unclamped state is provided.

A photo switch 62 for detecting the insertion of the magnetic disk 23 is provided near the roller 40.

FIG. 7 is a block diagram of the control circuit applied to the present invention.
In the figure, the same parts as those in FIGS. 3 to 6 are designated by the same reference numerals.

That is, the control unit 63 is connected to the photo switch 62 for detecting the insertion of the magnetic disk, the micro switch 61 for detecting the completion of clamping and the magnetic disk discharge switch 33, and the motor drive circuit 64 is driven in response to a command from the control unit 63. Then, the motor 34 for loading and ejecting the magnetic disk is rotated, and the magnetic disk transfer mechanism 65 and the clamp mechanism 66 are driven.

Next, the operation of the present embodiment configured as described above will be described.
A description will be given together with the timing chart shown in the figure.

First, when a magnetic disk is inserted from the front panel 31 side as shown by the arrow a in FIGS. 3 and 4, this magnetic disk is detected by the photo switch 62, and a magnetic disk insertion signal 62s is generated, and at the same time the motor is driven. 34 starts to rotate in the positive direction. The rotation of the motor 34 is transmitted to the worm gear 36 via the output shaft 35, and the bevel gears 38, 39
And gear 43 Coupling gear 45 Gear 44 through roller
40 starts spinning. And the inserted magnetic disk 23
Is transported in the direction of arrow a by this roller 40. Then, when the magnetic disk 23 is transferred and its tip end contacts the bent portion 52c at the inner end of the switching lever 52, the switching lever 52 is advanced against the tensile force of the spring 56. Along with this, the worm wheel 49 that meshes with the rack gear 57 of the switching lever 52 starts to rotate in the direction of arrow b. This state is shown in FIG.

However, since part of the worm wheel 49 is missing teeth, the gear part of the worm wheel 49 is a worm gear.
The switching lever 52 moves forward until it starts to mesh with 36.

When the worm wheel 49 and the worm gear 36 start meshing with each other, the rotation of the worm gear 36 is transmitted to the worm wheel 49, and the worm wheel 49 starts rotating together with the cam 51.

With the rotation of the cam 51, when the upper surface of the cam 51 comes into contact with one end of the lever 58, the lever 58 rotates clockwise about the shaft 60 as indicated by an arrow d in FIG. As it is moved, the support arm 28, which is given the tendency to rotate upward, is pushed down by the other end of the lever 58, and the magnetic disk 23 is clamped by the center cone 30. On the other hand, one end of the gear frame 46 changes the contact position from the surface at the higher position of the cam 51 to the surface at the lower position, so that the coupling gear 45 is centered on the fulcrum 47 by the pulling force of the spring (not shown). With the rotation of the rotating gear frame 46, the meshed state with the gears 43, 44 is released. As a result, the driving force from the motor 34 is not transmitted to the roller 40, the transfer of the magnetic disk 23 is stopped, and the magnetic disk 23 is clamped at that position and stopped. In this state, of course, the rack gear 57 of the switching lever 52 and the worm wheel 47 are in a position apart from each other.

Further, in FIG. 5, when the lever 58 is rotated clockwise, the micro switch 61 is turned on, and the clamp completion signal is sent.
61s occurs, the motor 34 stops, and the loading operation of the magnetic disk 23 is completed.

When the magnetic disk is loaded in this way and the magnetic disk 23 is to be ejected after the magnetic recording and reproduction are completed, when the magnetic disk ejection switch 33 is pressed, the magnetic disk ejection signal 33s is generated and the motor 34 is rotated in the reverse direction. To start.

When the motor 34 rotates in the reverse direction, the worm wheel 49 meshing with the worm gear 26 rotates in the direction of the arrow e as shown in FIG. 6, and as a result, the lever 58 and the gear frame 46 move in the opposite direction to that described above. Is rotated to.

As a result, the support arm 28 escapes from the restraint of the lever 58 by the elastic force of the leaf springs 29, 29 and moves upward to release the clamp. On the other hand, the coupling gear 45 descends again to start meshing with the two gears 43 and 44, the roller 40 starts reverse rotation, and sends out the magnetic disk 23 in the ejection direction as shown by the arrow f in FIG. . When the inner end of the magnetic disk 23 passes through the photo switch 62, the magnetic disk insertion signal
62s turns off, the motor 34 also stops, and the ejecting operation of the magnetic disk 23 ends.

In this state, the front edge of the magnetic disk is the front panel.
Since it projects from the magnetic disk insertion opening 31 by a predetermined distance, the user can easily pull it out from the magnetic disk insertion opening.

In this way, by using only one drive source, the loading, ejecting and clamping operations of the magnetic disk can be performed.

Effects As is apparent from the above description, according to the present invention, in a magnetic disk device having a mechanism for automatically loading and unloading a magnetic disk, a transfer means for loading and unloading the magnetic disk, and a magnetic Clamping means for clamping a disk, rotatably provided clutch cam means for selectively transmitting a driving force to the transfer means or the clamp means according to the rotational position, the transfer means, the clamp means, and the cam A power source for supplying a driving force to the means, and the magnetic disk that is moved by the transfer means, and is moved by the movement of the magnetic disk. By rotating the cam means according to the movement position, the cam means is driven. The clamp means or transfer means via the connection means and a connection control means for controlling the connection state of the power source, and the movement of the connection control means. And a destination of the power from the power source is switched between the transfer means and the clamp means by driving the cam means by the driving force from the power source, and the drive from the power source transmitted via the cam means. A structure is adopted in which the transfer operation or the clamp operation is selectively and continuously performed by these means by force.

According to such a configuration, it is possible to organically combine the respective means with respect to one power source, and to perform the desired transfer operation and clamp operation accurately, selectively and continuously in time series, This makes it possible to prevent problems such as an accident in which the clamp member comes into contact with the recording surface of the magnetic disk and a defective clamp.

Especially, since the connection state between the power source and the cam means is regulated by the coupling regulation means, when the magnetic disk is not transported to a predetermined position due to the slip of the roller of the transportation means, the clutch operation after transportation is performed. Therefore, the clamp operation is not performed, and the clamp operation at the wrong transfer position can be surely prevented, whereby the problems such as the contact accident and the defective clamp can be surely prevented.

Further, it is possible to obtain an excellent effect that the device can be downsized and the control circuit can be simplified.

[Brief description of drawings]

1 and 2 are block diagrams and timing charts of a control circuit for explaining a conventional structure, FIGS. 3 to 8 are diagrams for explaining an embodiment of the present invention, and FIG. 4 is a plan view, FIG. 4 is an enlarged plan view of an essential part for explaining the clamp operation, FIG. 5 is a side view of the essential part, FIG. 6 is an enlarged plan view of an essential part for the discharging operation, and FIG. 7 is a control. Circuit block diagram,
FIG. 8 is a timing chart. 20 …… frame, 21,22 …… guide 23 …… magnetic disk, 24,25 …… stopper 28 …… support arm, 30 …… center cone 31 …… front panel, 32 …… upper panel 33 …… magnetic disk Discharge switch 34 …… Motor, 35 …… Output shaft 36 …… Worm gear, 38,39 …… Bevel gear 40 …… Roller, 43,44 …… Gear 45 …… Coupling gear, 46 …… Gear frame 49 …… Worm wheel, 51 …… Cam 52 …… Switching lever, 56 …… Spring 58 …… Lever, 61 …… Micro switch 62 …… Foto switch

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-56-58167 (JP, A) JP-A-59-60759 (JP, A) JP-A-58-100272 (JP, A) Actual development Sho-57- 53873 (JP, U)

Claims (1)

[Claims] 1. A magnetic disk device provided with a mechanism for automatically loading and unloading a magnetic disk, a transfer means for loading and unloading the magnetic disk, a clamping means for clamping the magnetic disk, and a rotatable means. And a cam means for the clutch which selectively transmits the driving force to the transfer means or the clamp means according to the rotational position thereof, and a single cam means for supplying the driving force to the transfer means, the clamp means and the cam means. The power source and the magnetic disk which is moved by the transfer means by the transfer means are moved, and the cam means is rotationally driven according to the moving position of the magnetic disk, so that the clamp means or the transfer means and the power are transferred through the cam means. A cam by means of movement of the connection restricting means and driving force from the power source. The transfer destination of the power from the power source is switched between the transfer means and the clamp means by driving the step, and the driving force from the power source transmitted via the cam means transfers or clamps to these means. A magnetic disk drive characterized in that it is selectively and continuously performed.