JPS634265B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic recording media detection mechanism for a magnetic recording device.

A magnetic recording device requires a detection mechanism to detect the mounting operation of a magnetic recording medium and issue various operation commands. The method of interfering a magnetic recording medium with the actuator of a microswitch to extract an electric signal and obtaining an operation command from this electric signal is difficult because the stroke of the actuator is small and the touch between the actuator and the magnetic recording medium is unclear. It is unstable. Furthermore, as shown in Japanese Utility Model Application Publication No. 49-123568, in order to increase the stroke of the actuator, a part of the operating lever is cut out to form an operating piece to move the actuator up and down. However, since the mounting portion of the operating lever and the push button are both provided on the same surface of the switch body, it is not possible to reduce the height dimension. Generally, the presence or absence of a magnetic recording medium is detected by a mechanical mechanism, and the switch is switched by the operation of that mechanism.
It has the disadvantage that the number of parts is large and the structure is complicated.

The present invention has been made in view of the above points, and it is an object of the present invention to provide a magnetic recording media detection mechanism for a magnetic recording device that can reduce the size of a magnetic recording device, and in particular, can be made thinner, reliable in operation, and extremely simple in structure. The purpose is to obtain information.

The present invention provides a switch having a mounting portion on the top surface and an actuator protruding from the side surface perpendicular to the mounting portion, the base end being fixed in a cantilevered state to the mounting portion of the switch and aligned along the protruding direction of the actuator. A flexible plate made of an elastic metal plate is provided, and a pressure-receiving part that receives the pressure of the magnetic recording medium is formed on the free end side of the flexible plate, and a narrow bend is provided in the middle part of the flexible plate. The present invention is characterized in that a deflection promoting section is formed, and a pressing piece located on the pressure receiving section side of the deflection promoting section and cut and raised toward the actuator side is integrally formed on the flexible plate. Therefore, even if the flexible plate is attached to the mounting part located on the top surface of the switch, the size does not need to be larger than the height of the switch, and the pressure receiving part is not pressed by the magnetic recording media. When the free end of the flexible plate is displaced in the vertical direction, the pressing piece is displaced in a direction perpendicular to the direction of displacement of the pressure receiving part due to the deformation of the bending promotion part that bends in accordance with the displacement, thereby causing the switch to The actuator protruding from the side surface can be reliably pressed, thereby making it possible to reduce the size and thickness.

An embodiment of the present invention will be described based on the drawings.
1 is a bottom plate, and an insulating sheet 2 is placed on the top surface of this bottom plate 1.
a bobbin 4 that holds a coil 3 while being insulated by
are fixed by rivets 5. The lead wire 6 of the coil 3 is passed through the insulating sheet 2, the bottom plate 1 and the PC board 7 as shown in FIGS. 6 and 7.
It is soldered to a part of the PC board 7. As shown in FIG. 5, a Hall element 8 is held on the PC board 7,
These Hall elements 8 are located in openings (not shown) formed in the bottom plate 1 and face each of the coils 3. Further, a disk-shaped yoke 9, a donut-shaped magnet 10, a cylindrical holder 11, and a slit disk 12 are coaxially coupled, thereby forming a motor 13. The holder 11
A spindle 14 is fixedly fitted therein.

The bottom plate 1 is attached to the lower surface of the base 16 by four collars 15 at predetermined intervals. The spindle 14 is connected to the bottom plate 1 and the base 1.
This spindle 1 is supported by a bearing provided at
As shown in FIGS. 8 and 9, there is a media holder 1 on which a pinion 17 is integrally formed.
8 are fitted while being fixed by a dowel pin 19. A hole 20 formed in the media holder 18 accommodates pins 21 and a spring 22 that biases the pins 21 upward. Further, a projection 23 is formed on the upper surface of the media holder 18.
These protrusions 23 pass through a plate 24 that prevents the pin 21 from coming off and are crimped.

Next, on the upper surface of the base 16, a gear 25,
26, 27, 28, 29, 30, and 31 are rotatably held. The gear 25 is connected to the pinion 17
The gears 26 and 27, the gears 28 and 29, and the gears 30 and 31 are connected to rotate together on the same axis, and the gears 27 and 28 and the gears 29 and 30 are are interlocked with each other. Furthermore, a head arm 32 is rotatably held on the upper surface of the base 16 by a support shaft 34 while being biased in the return direction by a spring 33. A head load arm 36 is connected to a projecting piece 35 formed on the upper surface of the head arm 32 via a support shaft 37 so as to be able to move up and down. The tip is biased downward.
The gear 31 is attached to the head arm 32.
A sector-shaped gear 39 is formed to mesh with the gear 39, and the teeth 40 at one end of the gear 39 at the beginning of meshing are set to be larger in height and thickness than the other teeth. A non-interference portion 41 that does not mesh with the gear 39 is formed in the gear 31 . Furthermore, a rib 42 is integrally formed on the upper surface of the gear 30. The inner surface of this rib 42 is defined so that the radius from the center of the gear 30 changes continuously.
Furthermore, a third
As shown in FIGS. 4 and 10, a pin 43 is protruded from the inner surface of the rib 42, and a pin 44 is provided on the lower surface of the head load arm 32, passing through the head arm 32 and joining to the upper surface of the rib 42. is prominent.

A magnetic head 4 is attached to the tip of the head arm 32.
A recess 46 for holding 5 is formed. As shown in FIGS. 12 to 14, this recessed portion 46 has an open top surface and one side surface, and reference surfaces 47 and 48 are formed on two adjacent surfaces. This recess 4
A protrusion 51 that protrudes from the leaf spring 49 and the adjustment plate 50 is formed on the lower surface of the adjustment plate 8.
A screw boss 53 is formed into which a screw 52 inserted through the leaf spring 49 and the leaf spring 49 is screwed. The leaf spring 49 includes a push piece 54 facing the reference surface 47;
A push piece 57 that is inserted into a notch 56 formed in the bottom 55 of the recess 46 and faces the reference surface 48 is bent. Further, the adjusting plate 50 is formed with an opposing surface 58 that faces the outer surface of the reference surface 47 and a notch 60 for drawing out the lead wire 59 of the magnetic head 45, and an adjusting screw 61 is screwed into the opposing surface 58. A metal fitting 62 is embedded. The reference plane 47
A notch 63 is formed in which the lead wire 59 and the adjustment screw 61 can escape. As shown in FIG. 15, the lead wires 59 of the magnetic head 45 are hooked in a zigzag pattern around a plurality of pins 64 erected on the head arm 32, so that they do not loosen due to the friction between the lead wires 59 and the pins 64. do not have.

Next, support pieces 65 are cut and raised on both sides of the rear portion of the base 16. Further, a link 66 is attached to one side of the front portion of the base 16 so as to be rotatable within a vertical plane. Hinge holes 6 formed in the support piece 65 and both sides of the diskette base 67
By inserting flanged hinge pins 70 into the diskette bases 8 and 69, the diskette base 97 is held so as to be vertically movable. Further, a pin 71 protruding from one end of the link 66 is attached to the diskette base 67.
The link 66 is inserted into the elongated hole 72 formed on one side of the link 66.
Spring hanging pin 73 and base 16 installed between
By hanging the spring 75 between the spring hanging piece 74 fixed to the diskette base 67, the rotation range of the diskette base 67 is restricted, and when the link 66 rotates, the spring 75 moves upward with the rotation center of the link 66 as a dead point. or deviate downward. Therefore, when the diskette base 67 rotates upward, it is supported by the link 66, and when it closes downward, it is urged downward by the spring 75. An arm 76 is formed on one side of the diskette base 67 to raise the head load arm 36 upward when the diskette base 67 rotates upward. A magnetic recording medium 77 is housed in a jacket 78 and placed on a diskette base 67. A cover 79 covering the upper part of the jacket 78 engages recesses 80 formed on both rear sides thereof with claws 81 formed on both rear sides of the diskette base 67, and screws 82 inserted one by one from both sides of the front part. It is held by being screwed into the diskette base 67. On both inner sides of the rear part of this cover 79, there are recesses 8 into which the flanges of the hinge pin 70 fit.
3 is formed, thereby preventing the hinge pin 70 from coming off.

Next, two switches 8 are installed on the base 16.
4 and 85, and flexible plates 86 and 87 which bend under the pressure of the magnetic recording medium 77 to operate switches 84 and 85, respectively, are attached. The flexible plates 86 and 87 are connected to the switch 8.
The proximal ends are fixed in a cantilevered manner to the upper surfaces of the mounting portions 4 and 85. These flexible plates 86,8
7 is made of an elastic metal plate, and as shown in FIGS. 18 and 19, the base end 88 is connected to the switch 8.
Base 16 by screw 89 with 4 or 85
By forming a notch 90 in the middle part, a narrow bending promoting part 91 and a pressing piece 92 bent from one side of the notch 90 toward the actuator side, which will be described later, are formed. A pressure receiving portion 93 that interferes with the jacket 78 is formed.
The pressing piece 92 faces the actuator 94 of the switches 84 and 85. The pressure receiving portion 93 of one flexible plate 86 corresponds to a small hole (not shown) formed on the side of the jacket 78, and the switch 84 emits an electric signal for inhibiting writing when switched. The other switch 85 is connected to the power supply circuit of the motor 13.

In this configuration, the diskette base 67 is rotated upward together with the cover 79, the magnetic recording medium 77 is inserted onto the diskette base 67 together with the jacket 78, and the diskette base 67 is rotated downward. As a result, the spindle 14 and the pin 21 of the media holder 18 are inserted into the hole formed in the magnetic recording medium 77.
One of the flexible plates 87 has its pressure receiving portion 93 pressed by the jacket 78 and bends downward, and the pressing piece 92 presses the actuator 94 of the switch 85. This maintains the motor 13 in a driven state. The pressure receiving portion 93 of the other flexible plate 86 is pressed only when the small hole formed in the jacket 78 is closed with tape or the like. At this time, the flexible plate 86 bends and the pressing piece 92 presses the actuator 94 of the switch 84. This causes the switch 84 to issue an electrical signal prohibiting writing.

In this way, the flexible plates 86 and 87 detect the magnetic recording medium 77 and bend, but the movement is large and reliable. Furthermore, since the pressing piece 92 elastically presses the actuator 94, the flexible plates 86, 87 themselves are not pinched between the actuator 94 and the jacket 78, and are prevented from being permanently deformed. You will not be subjected to excessive force. This pressing piece 92 is located near the proximal end 88 of the intermediate portion of the flexible plates 86 and 87, but because it is located closer to the free end than the bending promotion part 91, it has a large movement and can be elastically bent to a large extent. Press the actuator 94 securely. Therefore, switch 8
The switching operation of 4 and 85 is stable. Moreover, the flexible plates 86 and 87 each have a single component and transmit the movement of the magnetic recording medium 77 in and out to either the switches 84 or 85, so the structure is extremely simple.

In this way, the switch 85 is turned on, and the motor 13
When the spindle 14 is driven, its rotation is on the one hand
and the media holder 18 to the magnetic recording medium 77, and the pinion 17 and gears 25, 26, 27, 28, 29, 30, 31, 3
9, the head arm 32 rotates from the position shown in FIG. 3 toward the outer periphery of the magnetic recording medium 77 as shown in FIG. At this time, in the process of writing or reading, the head load arm 36 transfers the magnetic recording medium 77 to the magnetic head 4.
Press 5. The state shown in Fig. 4 is gear 31, 3.
With the teeth at the end of gear 9 in mesh, the gear 31 is further engaged.
As the rotation progresses, the gear 31 is disengaged from the gear 39. At this time, the pin 43 is attached to the rib 42 of the gear 30.
The head arm 32 comes into contact with the inner surface of the spring 3.
Due to the force of 3, it returns quickly and there is no possibility of vibration or misalignment of the return position. Also, pin 4
4 rides on the upper surface of the rib 42, the head load arm 36 rotates about the support shaft 37 in a direction away from the magnetic recording medium 77. This can prevent deterioration of the magnetic recording medium 77. Then, as the radius of the rib 42 from the center of rotation of the gear 30 gradually changes, the pin 43 moves outward little by little from the center of the gear 30, and as a result, the head arm 32 is attached to the head load arm 36.
It returns without any inertia.

Further, the rotational force of the gear 31 is transmitted to the gear 39 from the position shown in FIG. 3, but since the teeth 40 at the end of the gear 39 are large in both height and thickness, the gear 31 does not come off from the gear 39. Teeth 40, which are the first to receive large forces, are also not damaged. Furthermore, although the meshing position of the gears 31 and 39 may shift during the assembly process, the number of teeth of the gear 39 of the head arm 32 is limited to the minimum number that meshes with the teeth of the gear 31, so that the head arm 32 can be moved out of the way. Do not move excessively in one direction.

Furthermore, the magnetic head 45 to the head arm 32
When assembling the recess 46, the upper surface and sides are open, making it easy to store the magnetic head 45. Also, the magnetic head 45 joins to the bottom 55 due to its own weight and is pushed by the push pieces 54 and 57 to the reference position. Surface 47, 4
Join to 8. Therefore, the magnetic head 45 can be easily aligned. magnetic recording media 77
For fine adjustment of the position in the radial direction, use the adjusting screw 61.
This can be done by rotating the .

Since the present invention is constructed as described above, the vertical displacement of the pressure receiving part pressed by the large magnetic recording medium of the flexible plate can press the actuator via the pressing piece as a displacement in a direction perpendicular to the pressure receiving part. Therefore, the magnetic recording media can be detected reliably, and the actuator of the switch is elastically pressed by the pressing piece formed on the flexible plate during the bending operation of the flexible plate. It does not undergo permanent deformation due to excessive force, and since the pressing piece is located closer to the free end of the flexible plate than the bending promotion part, the switch can be reliably switched with a large bending action. By transmitting the movement of the magnetic recording media in and out to the switch using a single flexible plate, the structure can be extremely simplified with fewer parts, and the overall structure can be made smaller and thinner. It has the following.

[Brief explanation of the drawing]

The drawings show one embodiment of the invention.
The figure is a perspective view with the cover removed, Figure 2 is an enlarged side view showing the internal mechanism with the base, diskette base, and cover cut away, and Figure 3 is an enlarged view of the arrangement of parts on the top of the base. Plan view shown in Figure 4.
The figure is an enlarged plan view showing the outward rotation of the head arm, Figure 5 is an exploded perspective view of the entire unit, and Figure 6 is an exploded perspective view of the entire head arm.
The figure is an enlarged perspective view of a part of the motor coil support structure, and FIG. 7 is an enlarged longitudinal cross-sectional side view.
Fig. 8 is an enlarged vertical side view of the media holder;
FIG. 9 is an enlarged exploded perspective view of the media holder;
Fig. 10 is a partially cutaway and enlarged side view showing the connecting structure between the head arm and the gear, Fig. 11 is an enlarged perspective view showing the gear that drives the head arm, and Fig. 12 is an enlarged view of the connection structure between the head arm and the gear. Exploded perspective view showing an enlarged view of the mounting structure of the magnetic head, Part 1
Fig. 3 is a plan view of a part of the head arm, Fig. 14 is a sectional view thereof, Fig. 15 is a perspective view of a part of the head arm seen from the back side, and Fig. 16 shows the mounting structure between the diskette base and the cover. FIG. 17 is a horizontal cross-sectional view of only the cover, showing the attachment structure between the diskette base and the cover, and FIGS. 18 and 19 are enlarged views of the relationship between the switch and the flexible plate. FIG. 77... Magnetic recording media, 84-85... Switch, 86-87... Flexible plate, 88... Base end,
91...bending promotion section, 92...pressing section, 93...
Pressure receiving part, 94...actuator.

Claims (1)

[Claims] 1. A switch is provided with an upper surface as a mounting portion and an actuator protruding from a side surface perpendicular to the mounting portion, the base end being fixed to the mounting portion of the switch in a cantilevered state and extending along the protruding direction of the actuator. A flexible plate made of a metal plate having elasticity is provided, and a pressure receiving part that receives the pressure of the magnetic recording medium is formed on the free end side of the flexible plate, and a narrow bending promoting part is provided in the middle part of the flexible plate. , and a pressing piece located on the pressure receiving part side of the bending promoting part and cut and raised toward the actuator side is integrally formed on the flexible plate. mechanism.