JPS6360474B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a latch structure in a door latch mechanism.

Conventionally, many floppy disk drive devices include a door latch mechanism, but when looking at the latch structure, many of them are formed to perform three-dimensional movement with the locking part of the door. ,
The structure becomes complicated, and there are cases where it becomes difficult to make the entire device thinner.

The present invention has been made in view of these points, and an object of the present invention is to provide a latch structure for a door latch mechanism that has a simple structure and can contribute to making the entire device thinner.

The present invention includes a circumferential surface that is displaced by pressing the door pin in the closing direction, and a latch portion that is located closer to the rotation support than the outer circumferential surface and stabilizes the pin that has come off the outer circumferential surface. A simple two-dimensional structure consisting mainly of a sliding circumferential curved surface is sufficient, and the pin regulating portion prevents malfunction.

An embodiment of the present invention will be described based on the drawings.
This embodiment is applied to a door latch mechanism of a floppy disk drive device. First, the basic configuration will be explained.
A DC motor 2 is attached, and a drive hub 4 is directly connected to the DC motor 2 via a shaft 3.
A cone 5 faces the drive hub 4, and is set so that the drive hub 4 and the cone 5 grip and rotate a magnetic disk 6 inserted through a media insertion port (not shown). There is. As is well known, the magnetic disk 6 consists of a square jacket and a thin flexible disk rotatably disposed within the jacket, with a central hole for gripping formed in the center.
At the rear, a magnetic head 7 is mounted on a carriage 8 and is set to be gripped and set to perform reading and recording operations on a rotating magnetic disk 6, and is set to move forward and backward in the radial direction by a guide shaft 9. Reference numeral 10 denotes a step motor for moving this carriage 8, and is connected by a predetermined steel belt 11. In addition, 12 is a magnetic head 7.
This is a head drive mechanism that moves the magnetic disk 6 toward and away from the magnetic disk 6.

Further, a leaf spring 13 is provided to support the cone 5. This leaf spring 13 has a length that spans almost the entire width of the main body 1, is supported at both ends by a boss 14 formed on the main body 1, and can be freely displaced only in the direction toward and away from the drive hub 4. . Its shape is a slightly elevated flat part 15 located in the center when viewed from the front and parallel to the drive hub 4 and cone 5.
and sloped portions 16 that become lower from the flat portion 15 toward both ends. The cone 5 is attached to the central lower surface of the flat portion 15.

A cone lift arm 17 is then provided which presses the leaf spring 13 to displace the cone 5 toward the drive hub 4. This cone lift arm 17 has a base 18 which is adjacent to the back of the leaf spring 13 and has approximately the same height as the flat part 15 thereof, and both ends of the cone lift arm 17 extend slightly to the rear and are connected to the support part 19 of the main body 1. It is rotatably supported in the vertical direction via a leaf spring 20 and a screw 21. This cone lift arm 17 is formed by press processing, and is made of a leaf spring 1.
Bent pieces 22 are formed on both sides, which are bent from the vicinity of the third end, passing inside both sides of the main body 1, and extending toward the media insertion opening side. A groove portion 23 is formed at the tip of this bent piece 22. Furthermore, two load protrusions 24 are formed on the base 18 of the cone lift arm 17, projecting above the leaf spring 13, bent downward, and contacting the leaf spring 13. The position of this load protrusion 24 is on the slope portion 16 of the leaf spring 13, but it is symmetrical with respect to the cone 5, and
This is the central position of the leaf spring 13 when viewed in the width direction.

Further, a cover 25 in which a media insertion port is formed is provided on the front side of the main body 1, and a door 26 for opening and closing the media insertion port is provided. A curved arm 27 is fixed near both ends of the door 26, and a stud 2 provided on the main body 1 is attached to the lower end of the arm 27.
A hole 29 is formed to engage with the hole 8 so that it can rotate freely. In the middle of the arm 27 is a pin 30.
is provided and is configured to engage the groove 23 of the cone lift arm 17 via a grooved collar 31. Further, a pin 32 is provided at the center of the inner surface of the door 26.

A latch 33 for latching the door 26 in the closed state via this pin 32 is provided near the media insertion opening. This latch 33 opens and closes the door 26 in a so-called one-way manner, and as shown in FIG. , an inner circumferential surface 38 formed by a curved outer circumferential surface 36 that is pushed and displaced by the movement of the pin 32 due to the closing operation of the door 26 and a groove 37 formed between the hole 35 and the outer circumferential surface 36; A sliding peripheral curved surface 40 that includes a latch part 39 formed at the center of 38 and that stabilizes the pin 32 and goes around on the same plane prevents direct communication between the inner peripheral surface 38 before and after the latch part 39 in the groove 37. It consists of a pin regulating part 41 that projects toward the latch part 39 at different levels, and a spring locking part 43 formed at the rear end and to which one end of a spring 42 is locked. Also,
Another stud 44 is erected near the stud 34, and an arm 45 is rotatably provided on this stud 44, and together with a magnet 46, a locking member 47 is constituted. That is, a hook portion 48 to which the other end of the spring 42 is locked is formed at one end of the arm 45, and a concave force transmitting portion 49 is provided approximately in the center, and a plunger 50 of the magnet 46 is connected to the hook portion 48.
A pin 51 provided in is locked. Here, the magnet 46 is turned on and performs a suction operation in response to reading and writing operations by the magnetic head 7.
The plunger 50 is provided with an E-ring 52. Note that 53 is a stopper for the arm 45.

An eject mechanism is provided on the front side of the step motor 10. This eject mechanism is mainly composed of an eject plate 55 and a spring 56 that can be slid forward and backward along a guide portion 54 formed on the main body 1, and this spring 56 is connected to a stud formed on the front side of the main body 1. 57 and a locking piece 58 bent upward in front of the eject plate 55. That is, when viewed from the side, the spring 56 is stretched diagonally so that the locking piece 58 side is higher. Further, a bent piece 59 is formed at the tip of the eject plate 55 to be bent downward and to which the jacket of the magnetic disk 6 is engaged. At a predetermined position of the guide part 54, there is a stepped part 6 for latching the end surface 60 of the eject plate 55.
1 is formed. Further, an eject plate 5 is provided at the base 18 of the cone lift arm 17.
A tongue piece 62 is formed on the eject plate 55 and protrudes toward the front side, and a leaf spring 6 is formed on the eject plate 55 and faces the tongue piece 62 near the locking piece 58.
3 is fixed. As shown in FIG. 5, this leaf spring 63 has an opening 64 and a bent piece 65 formed therein. Further, an eject prevention piece 66 bent upward is provided at a predetermined position of the eject plate 55.
is formed. This ejection prevention piece 66 is movable on the lower surface of the cone lift arm 17 in the normal state, but when the cone lift arm 17 is rotated, the ejection prevention piece 66
Its height and position are set so that it is locked to the rear end surface of the holder 8. Further, an escape hole 67 is formed in a part of the base 18 in correspondence with the position of the ejection prevention piece 66 of the eject plate 55 in the non-operating state.

In this configuration, basically, the magnetic disk 6 is inserted and set in a predetermined position, and the door 26 is closed, so that the magnetic disk 6 is gripped and set between the drive hub 4 and the cone 5. First, when the magnetic disk 6 is inserted in the state shown in FIG. As shown in FIG. 6b, the end face 60 falls into the stepped portion 61 and is latched, completing the insertion and setting of the magnetic disk 6.
The end face 60 is lowered into the stepped portion 61 by the force of the diagonally tensioned spring 56.
In this insertion and setting operation, the leaf spring 63 provided on the eject plate 55 comes into contact with the tongue piece 62, as shown in FIG.
It will bend in the opposite direction to the sliding direction. Due to the deflection of this leaf spring 63, the eject plate 5
A downward force is generated against the eject plate 55 to ensure that the eject plate 55 latches onto the stepped portion 61. Therefore, the eject plate 55 can be latched without the force of the spring 56.

After the magnetic disk 6 is inserted and set, the door 26 is closed as shown in FIGS. 3a to 3b. Incidentally, the dashed line in FIG. 3 indicates the magnetic disk surface. By closing this door 26, the pin 3
0 also rotates downward around the stud 28, so the cone lift arm 17, which has the groove 23 at its tip that is engaged with the pin 30, moves downward around the leaf spring 20 in conjunction with the door 26. It will move. As the cone lift arm 17 descends, the leaf spring 13 is pressed and displaced downward, causing the cone 5 to descend and grip the magnetic disk 6.

By the way, regarding the operation of the leaf spring 13 due to the downward pressure of the cone lift arm 17, this leaf spring 1
3 is supported at both ends so as not to move or twist in the lateral direction, and the 2
Since the cone 5 is deformed by receiving the load from the two load protrusions 24, the cone 5 attached to the flat portion 15 descends toward the drive hub 4 while remaining in a parallel state. Therefore, since the cone 5 does not descend obliquely, the periphery of the central hole will not be damaged when the magnetic disk 6 is gripped. This figure 4b
In the gripping state shown in FIG.
Since the gripping pressure, for example 2 kg, is exerted by the elastic force of the cone 3 itself, it is not necessary to provide a coil spring at the axial center of the cone 5. In addition, since the load point on the leaf spring 13 utilizes the inclined surface 16, there is no need to make the cone lift arm 17 higher than the leaf spring 13 as shown in FIG. It's advantageous.

On the other hand, in the downward movement of the cone lift arm 17, the tongue piece 62 slides on the leaf spring 63 and escapes into the opening 64 as shown in FIG. 6c and descends, so that the leaf spring 63 returns to the vertical state. . Also,
In the state shown in FIG. 6c, the cone lift arm 1
The base 18 of 7 and the ejection prevention piece 66 are engaged in the ejection prevention direction. Therefore, even if the eject plate 55 comes off from the stepped portion 61 due to some kind of impact or the like in the operating state in which the magnetic disk 6 is inserted and the door 26 is closed, the eject plate 55 is Since the eject prevention piece 66 is engaged with the base 18, the eject plate 55 does not perform an eject operation. That is, the bending piece 59 prevents unnecessary force from being applied to the jacket of the magnetic disk 6, thereby preventing damage caused by frictional contact between the rotating disk and its jacket, thereby protecting the magnetic disk 6. can. Note that this ejection prevention piece 66 has an escape hole 67 formed at a position opposite to the cone lift arm 17, which may cause problems when closing the door 26 without the magnetic disk 6 inserted, as shown in FIG. 6a. It will never be. On the other hand, if the magnetic disk 6 is not fully inserted and the door 26 is closed, the cone lift arm 17 comes into contact with the top of the ejection prevention piece 66 and cannot be set.

After the read/write operation, by opening the door 26, the cone lift arm 1
7 returns to its original position, the leaf spring 13 also returns to its original position, and the grip on the magnetic disk 6 is released. At the same time, the eject plate 55 also comes off the stepped portion 61 and is pulled in the ejecting direction by the spring 56, so that the magnetic disk 6 is ejected via the bending piece 59. That is, since the tongue piece 62 of the cone lift arm 17 rises from the state shown in FIG. Step 61 of eject plate 55
Lifting (unlatching) is performed stably, and the ejecting operation begins.

The latching operation of the door 26, that is, the one-way opening and closing operation of the door 26 will now be described. First, FIG. 7 shows the state when the door 26 begins to close and the pin 32 contacts the outer peripheral surface 36 of the latch 33. When the door 26 is pushed further, the pin 32 pushes the latch 33, but this latch 33 cannot escape backwards (downward in Figure 7) due to the stud 34, so the outer circumferential surface 36 remains in contact with the pin 32.
It will rotate as shown in Figure a. and,
When the door 26 is further pushed, the latch 33 rotates and the pin 32 is disengaged from the outer circumferential surface 36 and inserted into the groove 37 by the force of the spring 42. When the door 26 is pushed in as far as it can be pushed, the pin 32 hits the pin regulating piece 41. Therefore, the pin 32 that has entered the groove 37
When the door 26 is released without overrunning the latch 39, the pin 32 is latched to the latch 39 and stopped as shown in FIG. 9b. The state shown in FIG. 9b is the latched closed state of the door 26. At this time, the spring 42 is located to the left (FIG. 9) of the straight line connecting the stud 34 and the spring locking portion 43, and applies a clockwise urging force to the latch 33. If the door 26 is pushed again in this latched state, the pin 32 will also move and come off the latch part 39 onto the pin regulating part 41.
When the latch is released, the pin 32 returns to its original position through the inner circumferential surface 38 under the biasing force of the spring 42, as shown in FIG. 9c, and the door 26 is opened. In this way, the door 26 can be opened and closed in a one-way manner with extremely high operability, and the structure thereof is simple and inexpensive. That is, the latch 33 can be a two-dimensional structure formed in the same plane like the sliding circumferential curved surface 40.

On the other hand, even in the latched state as shown in FIG. 9b, FIG. 10 shows a state in which the magnetic head 7 is in read/write operation, for example. At this time, the magnet 46 is energized and the plunger 50 is attracted, so the arm 45 also rotates counterclockwise (FIG. 10) around the stud 44 due to the locking of the pin 51 and the force transmitting part 49. The hook portion 48 is displaced to the right. Therefore, with respect to the straight line connecting the stud 34 and the spring locking part 43, the hook part 48 (therefore, the spring 42) is the same or on the right side, and the spring 42
The biasing force applied to the latch 33 is switched counterclockwise. In this condition, door 2
Even if 6 is pressed, the pin 32 only comes off from the latch part 39, but the latch 33 does not rotate, and when the door 26 is released, the pin 32 is latched to the latch part 39 again. Therefore, even if a one-way system is adopted, the door 26 can be locked by locking with the locking member 47 during read/write operations.
This means that troubles such as inadvertently being opened will not occur.

As described above, the present invention stabilizes the outer circumferential surface of a door pin that is displaced when the pin is pressed in the closing direction, and the pin that is dislocated from the outer circumferential surface by being located on the rotation support side of the outer circumferential surface. Since the sliding peripheral curved surface that goes around the latch part and the pin regulating part are formed, a simple two-dimensional structure is required, which contributes to making the device thinner, and the pin regulating part prevents problems such as overruns. This can prevent malfunctions.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is an overall plan view, FIG. 2 is a perspective view of the cone lift arm and door, and FIGS. 3 a and 3 are side views showing the interlocking relationship thereof. Figures 4a and 4b are front views showing the gripping operation, Figure 5 is a perspective view of the eject plate, Figures 6 a to c are side views showing the operation of the eject mechanism, and Figure 7 is a bottom view of the door latch mechanism. 8 is a perspective view of the latch, FIGS. 9a to 9c are bottom views showing the latching operation, and FIG. 10 is a bottom view showing the locked state. 26... Door, 32... Pin, 33... Latch, 35... Hole (support part), 36... Outer circumferential surface, 3
9... Latch portion, 40... Sliding circumferential curved surface, 41...
Pin regulating part, 43... Spring locking part.

Claims (1)

[Claims] 1. A rotatably supported support part, an outer peripheral surface that is displaced by pressing the pin in the closing direction with respect to the door pin, and a pin that is located closer to the support part than the outer peripheral surface and has come off the outer peripheral surface. a sliding circumferential curved surface surrounding the latch portion that stabilizes the latch portion; a pin restriction portion that protrudes from the support portion side and faces the latch portion and restricts the movement of the pin toward the latch portion; 1. A latch mechanism for a door latch mechanism, comprising a spring locking portion to which a spring biasing the spring is locked.