JPH0432458B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a floppy disk drive device equipped with a spindle motor for rotationally driving a floppy disk made of a magnetic sheet used as an external storage medium for computers, etc. The present invention relates to a motor loading device that allows a spindle motor to be moved in the axial direction relative to a floppy disk to easily and appropriately load and unload the motor.

[Conventional technology]

Generally, a floppy disk drive device rotatably holds a floppy disk, and a magnetic head for reading and writing required data is placed in contact with one or both sides of the floppy disk. Therefore, when the floppy disk is rotated, the rotating main shaft is engaged with the center of the floppy disk (referred to as loading), and when the operation is completed, the main shaft is removed from the floppy disk (referred to as unloading). Furthermore, some floppy disk drive devices include a clamp that protrudes from the opposite side of the floppy disk's motor hub to hold the center of the floppy disk on the rotating main shaft, and others that use magnetic attraction without a clamp. Also, this rotational spindle is fixed so as not to move, and the critical dimensions of the hub center and hub height relative to the magnetic head are fixed.

However, conventionally, the floppy disk used in a floppy disk drive device configured in this way is housed in a cartridge that has an opening for directly contacting the clamp holding the floppy disk, or for allowing two heads to contact the floppy disk. As a result, a certain area of the recording surface of the floppy disk is exposed, which is susceptible to dust stains, fingerprints, scratches, etc.

From this point of view, the motor that drives the floppy disk is attached to a frame configured to be rotatable around the axis of the drive device, and a groove edge member is attached to the end of this frame, and this groove edge member is used to store the floppy disk. The opening for inserting the cartridge into the floppy disk drive is closed, and when the groove edge member is moved from the opening when inserting the cartridge into the floppy disk drive, the frame rotates around the pivot point. The motor is then moved out of its engagement position with the floppy disk, and by moving the groove edge member to its closed position after inserting the cartridge, the frame rotates about its bung pivot and the motor main shaft engages with the floppy disk. A floppy disk drive device has been proposed in which the hub is magnetically attracted and held, and the floppy disk is placed close to a Bernoulli plate fixed to the drive device (Japanese Patent Application Laid-Open No.
57-181487).

However, in this type of floppy disk drive device, the engagement between the motor drive main shaft and the floppy disk hub must be performed with high precision and positioning with excellent reproducibility. The air layer formed between the Bernoulli plate and the floppy disk becomes non-uniform, causing various problems such as damage to the floppy disk and increased azimuth error of the magnetic head.

[Problems to be Solved by the Invention] In the conventional floppy disk drive device described above, when loading or unloading the floppy disk by moving the motor drive main shaft toward or away from the hub of the floppy disk, it is difficult to accurately position and repeat the process. In order to improve reproducibility, it is necessary to set multiple reference planes for the required component parts, to arrange the parts relative to these reference planes, and to prevent positional fluctuations due to fatigue of the parts due to complicated and frequent handling. This has the disadvantage of impairing reproducibility.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a structure in which a floppy disk is placed on a Bernoulli plate, the floppy disk is rotated stably by forming an appropriate air flow and an air layer, and data is recorded and reproduced on the floppy disk using a magnetic head. In this floppy disk drive device, by moving the spindle motor that rotates the floppy disk up and down, the hub and drive shaft of this motor can be attached and detached from the floppy disk with a simple configuration, with proper and high precision, and with good reproducibility. An object of the present invention is to provide a motor loading device for a floppy disk drive device that can prevent damage to the floppy disk and azimuth error of the magnetic head.

[Means for solving problems]

In the floppy disk drive motor loading device according to the present invention, a floppy disk stored in a cartridge is loaded into a frame, and a Bernoulli plate disposed on the frame so as to face the floppy disk at the time of loading; The spindle motor has a drive shaft that engages with the floppy disk and rotates it, and a magnetic head that appropriately moves each track of the rotationally driven floppy disk to read and write data. In the floppy disk drive device, the spindle motor is supported by a support body, and the spindle motor is supported by a support body, and the spindle motor is supported by a support body, and the spindle motor is supported by a support body, and the spindle motor is supported by a support body. Pins are provided protrudingly on a part of the support body corresponding to the pair of side parts, and one end of the pair of loading arms is connected to each pin of the support body, and these loading arms are connected to each other as loading arms. A pair of brackets are provided on the frame body, which are rotatably pivotally connected to the shaft, and are held vertically movably by inserting pins of the support body, and the loading arm shaft is inserted between the brackets, and the loading arm shaft is rotated. A loading state in which a loading cam attached to a loading shaft to be operated is arranged at the other end of the loading arm, and a drive shaft and a motor hub of the spindle motor protrude from an opening provided in the center of the Bernoulli plate or the opening. A cylindrical portion of the spindle motor is fitted into a cylindrical portion provided in the frame body so that the spindle motor is guided and moved in either direction in an unloading state in which the drive shaft of the spindle motor and the motor hub are retracted from the part. supporting the spindle motor;
An elastic member is provided on the loading arm to always set the spindle motor in the loading state, and when the loading cam is set to a position to press the other end of the loading arm by rotation of the loading shaft. The spindle motor is characterized in that the loading state of the spindle motor is released against the bias of the elastic member to bring the spindle motor into the unloading state.

In the motor loading device, the elastic member that always maintains the spindle motor in a loaded state with respect to the loading arm is connected between each loading arm and each bracket via a loading arm shaft that is inserted between the opposing brackets. Each can be configured with attached coil springs.

Further, a third pin may be provided to protrude perpendicularly to the pair of opposing pins protruding from the support, and a bracket may be provided through which the third pin is inserted and which holds the third pin in a vertically movable manner.

Further, the loading cam that acts on the pair of loading arms contacts the other end of the loading arm against the elastic force due to the rotation of the loading shaft, and displaces it by lever action, thereby moving the spindle motor. It is configured to move perpendicularly to the axial direction.

Furthermore, the cylindrical part provided in the frame is made of a motor guide bearing, and its inner peripheral surface has a two-stage structure consisting of a tapered part and a straight part, so that the planar positional relationship with respect to the magnetic head is as described above when loading of the floppy disk is completed. The motor housing cylindrical portion that supports the spindle motor can be configured to be regulated by the straight portion.

In addition, the amount of protrusion of the motor hub is determined by the pressing force of the loading arm and the contact between the reference surface of the spindle motor support and the reference surface of the frame, and the same force is applied to the reference surfaces of the three points of the frame. It can be configured as follows.

[Effect]

According to the motor loading device for a floppy disk drive device according to the present invention, the entire spindle motor is supported by a support body, and a pair of pins are provided on opposing sides of the support body, and these pins are respectively connected by a pair of loading arms. The hub of the floppy disc is supported and held movably in the vertical axial direction, and is disposed on the Bernoulli plate by bringing a loading cam into contact with the other end of the loading arm and displacing them by lever action. The drive shaft of the spindle motor and the motor hub can be vertically moved forward and backward to perform proper and smooth loading and unloading operations.

In particular, according to the motor loading device of the present invention, it is possible to move the spindle motor perpendicularly and by a fixed distance in the axial direction of the spindle motor with a simple configuration, thereby improving the performance of this type of floppy disk drive device and allowing the magnetic head to read and write from and to the floppy disk. Accuracy can be maintained well, and the floppy disk can also be sufficiently protected.

〔Example〕

Next, embodiments of a motor loading device for a floppy disk drive device according to the present invention will be described in detail below with reference to the accompanying drawings.

1 to 5 show an embodiment of a floppy disk drive device incorporating a motor loading device according to the present invention.

Fig. 1 is a plan view of the device seen from the Bernoulli plate side on which the floppy disk is arranged, Fig. 2 is a rear view of the device of Fig. 1 showing the installation state of the floppy disk drive motor, and Fig. 3 is a side view of the device with the drive motor installed. FIG. 4 is a cross-sectional side view of the main part showing the unloading state of the drive motor with respect to the floppy disk, and FIG. 5 is a cross-sectional side view of the main part showing the loading state of the drive motor with respect to the floppy disk. Therefore, the apparatus of the present invention will be explained based on these drawings. In FIG. 1, reference numeral 10 indicates a frame body into which a floppy disk drive device is installed, and a Bernoulli plate 14 for arranging a floppy disk 12 is fixed to one side of this frame body 10 via a stopper 16. At the center of the Bernoulli plate 14 where the floppy disk 12 is placed, there is a central opening 24 through which the drive shaft 20 and hub 22 of the spindle motor 18 for supplying air and rotationally driving the floppy disk 12 are inserted.
A long hole 26 is formed spaced apart from the central opening 24 and extending in the radial direction thereof, and a magnetic head 28 is displaceably inserted through the long hole 26.

Therefore, in this embodiment, the spindle motor 18, as shown in FIG. 3, includes a motor housing cylindrical part 30, a motor rotor part 32, and a support body 34 that movably holds the spindle motor 18. Pins 36 and 40 are provided on a pair of opposing edges of this support body 34 to protrude outward in the radial direction, and a third pin 38 is provided to protrude in a direction displaced by 90 degrees with respect to the one pin 36. These pins 36, 40, and 38 are then attached to the frame 10, respectively.
It is attached so that it can move up and down with respect to the brackets 42, 46, and 44 that are fixed to it. Therefore, each of the brackets 42, 46, 44 includes each of the pins 36, 40,
A vertically long pin insertion hole 48 is provided in each case so that the pin 38 can be held vertically movably. The spindle motor 18 has a drive shaft 20 protruding from the center of the tip of the motor housing cylindrical portion 30, and a motor hub equipped with a magnet 54 on the outer periphery of its base for attracting and holding the hub 52 of the floppy disk 12 housed in the cartridge 50. 22 are provided. In this case, a motor guide bearing 56 for guiding the motor housing cylindrical portion 30 of the spindle motor 18 is attached to the frame 10, and the spindle is attached to the motor 1 during loading.
8 is firmly fixed in place.
Therefore, this motor guide bearing 56 has a tapered part 58 for guiding on the upper side and a straight part 60 on the lower side for holding the motor housing cylindrical part 30. Further, the support body 34 of the spindle motor 18 is provided with a belt-shaped reference surface 104 for contacting the frame body 10, and the frame body side facing this is provided with three reference surfaces 103a, 103b, 103c.
will be established.

A pair of opposing pins 36 and 40 are provided on the support 34 of the spindle motor 18 with loading arms 62 and 64 for loading and unloading the spindle motor 18 with respect to the floppy disk 12. Provided for each. These loading arms 62, 64 are pivotally connected to a loading arm shaft 66, a portion of which is inserted between the brackets 42, 46, and coil springs 68, 70 are wound around the loading arm shaft 66, respectively. , one end thereof is engaged with the brackets 42, 46, respectively, and the other end is brought into contact with the pin 36, 40 side of the loading arm shaft 66 of the loading arms 62, 64, respectively, so that the spindle motor 8 is always kept in the loading direction. (Downward in FIG. 3). On the other hand, the other end sides of the loading arms 62 and 64 are connected to a loading cam 7 mounted on a loading shaft 72, respectively.
It is configured so that it comes into contact at a predetermined rotation angle of 4 or 76. Note that the loading shaft 72
has one end protruding from the outside of the frame 10, and an operating lever 78 is provided at the end so that it can be operated externally. Further, the loading shaft 72 is provided with a pair of operating cams 80 and a lock cam 82 adjacent to the loading cam 76 for mechanically self-maintaining the loading state. Therefore, the operation cam 80 and the lock cam 82 are
During the loading operation, the operating cam 80 turns on the limit switch 80, which energizes the solenoid 86, and the operating rod 88 resists the elasticity of the spring 90 attached to one end of the lever 88 via the lock arm 92 attached to it. and displaced,
The lock arm 92 is held in a position to lock the lock cam 82, thereby restraining the rotational movement of the loading shaft 72. Furthermore, the loading shaft 72 is held by the frame 10 via a bearing 94 as appropriate, and the loading shaft 72 is provided with a rotational displacement limiting cam 96 and the like.

In addition, in the above-mentioned embodiment, reference numeral 98
100 is a lead wire bundle that supplies a control signal for controlling the drive of the spindle motor 18; 100 is a spring for elastically supporting the support body 34 of the spindle motor 18 during loading or unloading; A spring is shown, which is connected to the tip of the loading shaft 72 and is used to elastically hold the loading shaft 72 at all times to ensure smooth operation.

Next, the operation of the motor loading device constructed as described above will be explained with reference to FIGS. 4 and 5. FIG. 4 shows the unloading state of the spindle motor 18 with respect to the floppy disk 12, and FIG. 5 shows the loading state.

Now, in FIG. 2, the loading cam 74,
When the loading arms 76 do not act on the loading arms 62, 64, the loading arms 62, 64 are attached to the support body 34 of the spindle motor 18 with the loading arm shaft 66 as a fulcrum by the action of the coil springs 68, 70. 3, the reference surface 104 of the support body 34 is pressed against the three reference surfaces 103a, 103b, and 103c of the frame body to maintain the loading state ( (See Figure 5). Therefore, in order to bring the spindle motor 18 into the unloading state from this state, the loading cams 74, 7 are rotated by rotating the loading shaft 72 in the direction shown by the arrow in FIG.
6 comes into contact with the ends of the loading arms 62, 64 and forcibly presses them downward, and as a result, the loading arms 62, 64 pivot about the loading arm shaft 66, and the other ends are lifted up. It will be done. In this case, the spindle motor 18 is always displaced in the vertical direction with respect to the Bernoulli plate 14 because the pins 36 and 38 protruding from the support body 34 move along the pin insertion holes 48 provided perpendicularly to the brackets 42 and 46. Then, it can be brought into an unloading state (see FIG. 4). Next, in order to change the spindle motor 18 from this state to the loading state, the loading shaft 72 is rotated in the direction shown by the arrow in FIG. Separated from the end, the loading arms 62 and 64 pivot about the loading arm shaft 66 under the action of the coil springs 68 and 70, and the other end is pushed down. At this time, the drive shaft 20 of the spindle motor 18 and the motor hub 22 protrude slightly from the center opening 24 of the Bernoulli plate 14, so that the floppy disk 12, which is disposed facing the spindle motor 18, has its hub 52 attracted by the magnet 54 to the motor hub 22. It is held by force and enters the loading state (see Figure 5).
Further, in this loading state, the loading shaft 72 can be mechanically locked as described above by the operating cam 80 and the locking cam 82 provided on the loading shaft 72.

In addition, in the above-mentioned embodiment, the spring 1
00 can be omitted.

〔Effect of the invention〕

As is clear from the embodiments described above, according to the present invention, the spindle motor is held by a support, a pair of opposing pins are provided on the support, and the upper and lower parts are connected to the bracket fixed to the frame via the pins. These pins are attached movably and connected to one end of each independent loading arm, and each of these loading arms is pivotally connected to a common loading arm shaft, which is always attached in the loading direction by a spring. By further arranging a loading cam at the other end of the loading arm and attaching these loading cams to a common loading shaft,
By rotating the loading shaft, the spindle motor itself can be moved a certain distance perpendicularly to the Bernoulli plate, making it possible to easily and properly load and unload the floppy disk.

Furthermore, for the spindle motor upon completion of loading, height accuracy of the motor hub protruding with respect to the Bernoulli plate and planar positional accuracy of the drive shaft with respect to the magnetic head are required. Therefore, in the present invention, regarding the former point, two loading arms are used and their points of action are placed on a straight line passing through the drive shaft of the spindle motor at an equal distance from said shaft,
Moreover, by arranging one point of the three reference planes of the frame on this straight line and arranging the other two points at 120 degrees, the pressing force of each loading arm can be applied equally. The height accuracy can be maintained. In addition, when the spindle motor moves until loading is complete, the load balance is minimized by arranging the motor guide bearing coaxially with the motor shaft, and since lateral pressure is not directly applied to the motor guide bearing, the spindle motor moves smoothly. This makes it possible to achieve flexible movement. On the other hand, regarding the latter point, in the present invention,
Since the cylindrical part of the motor housing guided by the motor guide bearing can be smoothly moved to the straight part through the tapered part formed in the bearing without any dimensional difference, the positional accuracy can be maintained.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and it goes without saying that various designs can be made without departing from the spirit of the present invention. .

[Brief explanation of drawings]

1 is a plan view of a floppy disk drive device showing an embodiment of a floppy disk motor loading device according to the present invention, on the floppy disk arrangement side; FIG. 2 is a schematic rear view of the floppy disk drive device shown in FIG. 1; and FIG. 1 is a cross-sectional side view of the main part of the motor loading device shown in FIG. 1, and FIGS. 4 and 5 are cross-sectional side views of the main part showing the operating state of the motor loading device shown in FIG. FIG. 4 shows the unloading state, and FIG. 5 shows the loading state. 10...Frame body, 12...Flotspid disc, 1
4... Bernoulli plate, 16... Stop, 18... Spindle motor, 20... Drive shaft, 22... Motor hub, 24... Center opening, 26... Long hole, 28
... Magnetic head, 30 ... Motor housing cylindrical part, 32 ... Motor rotor part, 34 ... Support body,
36, 38, 40... pin, 42, 44, 46...
... Bracket, 48 ... Pin insertion hole, 50 ... Cartridge, 52 ... Hub, 54 ... Magnet, 56 ... Motor guide bearing, 58 ...
Tapered part, 60... Straight part, 62, 64...
... Loading arm, 66 ... Loading arm shaft, 68, 70 ... Coil spring, 72 ... Loading shaft, 74, 76
... Loading cam, 78 ... Operation lever, 8
0...Operation cam, 82...Lock cam, 84...
Limit switch, 86... Solenoid, 88...
... Operating rod, 90 ... Spring, 92 ... Lock arm, 94 ... Bearing, 96 ... Rotational displacement limiting cam, 98 ... Lead wire bundle, 100 ... Spring, 102 ... Spring, 103a, 103b,
103c...Reference surface of the frame body, 104...Reference surface of the support body.

Claims (1)

[Scope of Claims] 1. A floppy disk housed in a cartridge is loaded into a frame, and at the time of loading, a Bernoulli plate disposed on the frame so as to face the floppy disk engages with the loaded floppy disk. A spindle motor having a drive shaft for rotationally driving the floppy disk, and a magnetic head for appropriately moving each track of the rotationally driven floppy disk to read and write data. In the floppy disk drive device, the spindle motor is supported by a support member, and the slot is provided with an elongated hole through which the magnetic head faces so as to be movable in the radial direction from the magnetic head. pins are provided protruding from a part of the support body, one end of a pair of loading arms is coupled to each pin of the support body, and these loading arms are rotatably pivoted to a loading arm shaft. A pair of brackets are provided on the frame body, and the pins of the support body are inserted thereinto to hold the frame member vertically movably, and the loading arm shaft is inserted between the brackets, and the loading arm shaft is rotatably operated. The attached loading cam is disposed on the other end side of the loading arm, and the spindle motor is placed in a loading state in which the drive shaft and motor hub of the spindle motor protrude from an opening provided in the center of the Bernoulli plate, or the spindle is placed from the opening. The cylindrical portion of the spindle motor is fitted into the cylindrical portion provided on the frame so that the spindle motor is guided and moved in either direction in an unloading state in which the drive shaft of the motor and the motor hub retract. An elastic member is provided to support the motor and always set the spindle motor in the loading state on the loading arm, and the loading cam is pressed against the other end of the loading arm by rotation of the loading shaft. 1. A motor loading device for a floppy disk drive device, characterized in that when the spindle motor is set at a position where the spindle motor is set to the unloading state, the loading state of the spindle motor is released against the bias of the elastic member to bring the spindle motor into the unloading state. 2. In the motor loading device according to claim 1, the elastic member that always maintains the spindle motor in the loading state with respect to the loading arm is provided between each loading arm and each bracket, and A motor loading device for a floppy disk drive device consisting of coil springs each attached via a loading arm shaft inserted between them. 3. In the motor loading device according to claim 1, a third pin is provided protruding in a direction perpendicular to the pair of opposing pins protruding from the support, and the third pin is inserted into the support. A motor loading device for a floppy disk drive device, which is equipped with a bracket that holds the floppy disk so as to be movable up and down. 4 In the motor loading device according to claim 1, the loading cam acting on the pair of loading arms is brought into contact with the other end of the loading arm against elasticity by rotation of the loading shaft. A motor loading device for a floppy disk drive device, which is configured to move a spindle motor in its axial direction by contacting and displacing it by lever action. 5. In the motor loading device according to claim 1, the cylindrical portion provided in the frame is made of a motor guide bearing, and its inner peripheral surface has a two-stage structure consisting of a tapered portion and a straight portion, A motor loading device for a floppy disk drive device, wherein the planar positional relationship with respect to the head is such that a cylindrical portion of a motor housing supporting a spindle motor is regulated by the straight portion when loading of the floppy disk is completed. 6. In the motor loading device according to claim 1, the amount of protrusion of the motor hub is determined by the pressing force of the loading arm and the abutment between the support reference surface of the spindle motor and the reference surface of the frame, and A motor loading device for a floppy disk drive device configured to have equal acting forces on three reference planes of the body.