JPH0710840U - Magnetic disk unit - Google Patents

Abstract

(57) [Abstract] [Purpose] To obtain a magnetic disk device with a small number of parts and a reduced number of assembly steps by directly operating the chucking mechanism of a floppy disk with an eject lever that slides. . A swing arm in which an inclined cam 21 having a predetermined inclination is integrally formed in the middle of the eject lever 31, and the chucking mechanism 8 of the floppy disk 50 is vertically moved up and down by the inclined cam 21 of the eject lever 31. The operating pin 22 of 23 is elastically contacted.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a magnetic disk device used in a personal computer, a word processor, etc., and more particularly to a magnetic disk device that operates a chucking mechanism of a floppy disk by a slide operation of an eject lever.

[0002]

[Prior art]

 As is well known, a so-called magnetic disk device is used for recording information on a floppy disk composed of a flexible rotating magnetic disk or reading the recorded information. Since there are multiple types of disks such as 8 inch, 5.25 inch, 3.5 inch, etc., the floppy disk that can be used by the magnetic disk device is specified.

By the way, in such a magnetic disk device, for example, as disclosed in Japanese Utility Model Laid-Open No. 4-12 6344, a 5.25 inch (hereinafter referred to as 5 inch) floppy disk is used as an eject lever. The chucking mechanism, which operates continuously with the sliding operation, clamps and releases the clamp on the upper surface of the spindle of the magnetic disk device.

That is, in order to clamp a 5-inch floppy disk, this magnetic disk device is provided with an eject lever that slides back and forth along the right side surface of the housing of the magnetic disk device. A link lever that engages with the pin protruding from the eject lever is extended to the left side of the housing along the bottom of the frame, and the end of the link lever is bent vertically upward. Is formed.

In addition, a clamp member as a chucking mechanism is rotatably provided on a sub-frame constituting a frame of the magnetic disk device, and a pin provided on the base end side of the clamp member has an inclined cam surface. Is hit by.

Therefore, based on the above-described configuration, the tilt cam is moved in the front-rear direction via the link lever by the sliding operation of the eject lever of the magnetic disk device, and the clamp member such as the collet is moved up and down to move the floppy disk. Clamp or unclamp the disc to the top of the spindle.

[0007]

[Problems to be solved by the device]

 However, in this magnetic disk device, the clamp member for clamping the floppy disk is arranged on the left side of the sub-frame, so that the sliding operation force of the eject lever arranged on the right side is transmitted to the clamp member. However, the members such as the link lever and the like must be installed along the bottom surface of the frame, and the number of parts such as the link lever and the connecting pin increases, and the number of assembling steps increases, resulting in high cost. It was

In view of the above-mentioned conventional problems, an object of the present invention is to reduce the number of parts and the number of assembly steps by directly operating the chucking mechanism of a floppy disk by means of an eject lever that slides. This is to obtain a magnetic disk device that can be reduced.

[0009]

[Means for Solving the Problems]

 In order to achieve this object, the present invention provides a magnetic disk device in which a chucking mechanism of a floppy disk is actuated by a slide operation of an eject lever, and an inclined cam is integrally formed at a midway part of the eject lever. We propose a magnetic disk drive in which the operating pin of the swing arm that raises and lowers the chucking mechanism of the floppy disk is elastically contacted with the inclined cam of the lever.

[0010]

[Action]

 According to the magnetic disk device of the present invention having such a structure, the chucking mechanism for the floppy disk is provided while the operating pin of the swing arm moves along the cam surface of the inclined cam due to the sliding operation of the eject lever. Can be moved up and down.

Therefore, parts such as a link lever and a connecting pin for transmitting the operating force of the eject lever to the clamp member of the floppy disk are not required, and the man-hours for assembling the parts and the assembling man-hours are reduced to reduce the cost. Can be planned.

[0012]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings.

FIG. 3 is a top view of a magnetic disk apparatus using a 5-inch floppy disk according to the present invention with a top cover removed, and FIG. 4 is a bottom view of the 5-inch magnetic disk apparatus of FIG. A front bezel 1 having an insertion port for a 5-inch floppy disk 50 is attached to the front surface of the magnetic disk device 2.

In the 5-inch magnetic disk device 2, a chassis is constructed by assembling the left and right side frames 3, 4 with the main frame 5 on the bottom surface and the sub-frame 6 on the upper surface. Various print substrates 7 and electronic components are fixed to the main frame 5 and the sub frame 6.

Further, in this magnetic disk device 2, a 5-inch floppy disk 50 is inserted from an insertion opening of the front bezel 1 attached to the front surface, and a chucking for holding the floppy disk 50 at a predetermined position. A mechanism 8, a head portion 10 having a magnetic head 9, and a head sliding mechanism 11 for moving the head portion 10 in the direction of arrow B toward the center of the magnetic disk are provided.

In the head section 10, the rear end of the upper carriage 12 and the rear end of a lower carriage (not shown) are connected by a leaf spring 13 or the like, and the upper surface of the upper carriage 12 is twisted by a twist bar 14. Pressed by one of the hooks, the upper carriage 12 of the head portion 10 can swing in the vertical direction in conjunction with the operation of the chucking mechanism 8.

The head sliding mechanism 11 for moving the head portion 10 in the front-rear direction slides forward and backward on the traveling member 17 engaged with the spiral groove of the lead screw 16 rotated by the stepping motor 15 and the guide shaft 18. The guide member 19 is movably mounted.

The chucking mechanism 8 includes a first swing arm 23 that moves up and down in conjunction with a slide operation of an eject lever 31 to which the eject button 20 is fixed, and a protrusion formed on a side edge of the first swing arm 23. The second swing arm 24 that engages with the piece 23a and moves up and down is provided. The first swing arm 23 and the second swing arm 24 are pivotally supported on the subframe 6 via support shafts 28 and 29, respectively. Then, the coil springs 25 and 26 push one end side upward.

The actuating pin 22 fixed to the side end portion of the first swing arm 23 is directly elastically contacted with the cam surface of the inclined cam 21 formed integrally with the eject lever 31 to move the inclined cam 21. Accordingly, the operation pin 22 is moved up and down, and the first swing arm 23 and the second swing arm 24 are moved up and down.

An index hole detection sensor 27 is installed on the upper surface of the 5-inch magnetic disk device 2, and the detection sensor 27 forms an index hole formed in the inserted 5-inch floppy disk 50. The position of 53 can be detected.

FIG. 4 is a bottom view of the 5-inch magnetic disk device 2, in which various printed circuit boards 7 a, 7 b and the like are attached to the lower surface of the main frame 5 and the 5-inch floppy disk 50 is sandwiched. A spindle motor 30 that is directly driven to rotate is rotatably installed.

An eject lever 31 to which an eject button 20 is fixed is attached to one side of the lower surface side of the main frame 5, and the eject lever 31 is urged in the arrow Y direction via a return spring 32. At the same time, since the rack 31a formed at the tip of the eject lever 31 is engaged with the pinion 33a of the rotary damper 33, abrupt movement of the eject lever 31 is prevented when the floppy disk 50 is inserted and ejected. It

As shown in FIG. 1, an inclined cam 21 bent vertically upward is integrally formed in the middle of the eject lever 31. The inclined cam 21 has a first swing arm. An operation pin 22 for vertically moving 23 up and down is in elastic contact.

As shown in FIG. 2, the inclined cam 21 of the eject lever 31 has a first cam surface 21a having a steep slope between strokes m and a first cam surface 21a between strokes n. The second cam surface 21b having a gentler slope and the flat upper end surface 21c are continuously formed, and the operation of the eject lever 31 causes the operation pin 22 of the first swing arm 23 to move the cam surface of the inclined cam 21. When moving, the chucking mechanism 8 of the floppy disk 50 and the upper carriage 12 of the head portion 10 are moved up and down.

That is, the first cam surface 21a of the tilted cam 21 is moved to the other side of the first swing arm 23 while the operating pin 22 of the first swing arm 23 moves a stroke m along the first cam surface 21a. The collet installed on the end side descends from the highest position and has a height until it comes into contact with the spindle. Also, the second cam surface 21b of the inclined cam 21 has a collet that comes into contact with the spindle while the operation pin 22 moves along the second cam surface 21b and then travels along the second cam surface 21b. It has a height enough to obtain a pressing force for holding the disk 50.

Next, the operation of the magnetic disk device configured as described above will be described. First, when the floppy disk 50 is inserted through the insertion port of the magnetic disk device 2, the eject lever 31 is unlocked and the return spring 32 causes the eject lever 31 to return to the front of the main body.

The actuating pin 22 of the first swing arm 23 elastically contacting the inclined cam 21 of the eject lever 31 moves along the first cam surface 21 a and the second cam surface 21 b of the inclined cam 21. The other end of the second swing arm 24 that rides on the upper end surface 21c, pushes down the other end of the first swing arm 23 against the spring 25, and engages with the first swing arm 23. The side is pushed down against the spring 26.

At this time, while the operating pin 22 of the first swing arm 23 elastically contacting the inclined cam 21 of the eject lever 31 moves the stroke m along the first cam surface 21a, the first swing arm The collet of the chucking mechanism 8 installed at the other end of 23 is lowered and brought into contact with the spindle.

Further, while the operating pin 22 moves along the stroke n from the first cam surface 21a to the second cam surface 21b, when the collet is brought into contact with the spindle, the collet is further lowered. Since the tapered portion of the collet penetrates the central opening of the hole of the floppy disk 50 and fits into the recess of the spindle hub, the floppy disk 50 is centered.

Further, when the actuating pin 22 of the first swing arm 23 rides on the upper end surface 21 c of the inclined cam 21, the collet supported by the leaf spring of the first swing arm 23 is moved by the elasticity of the leaf spring. Since it is pushed down further, a pressing force for holding the floppy disk 50 is obtained, and the peripheral edge portion of the hole of the floppy disk 50 is held between the flange portion of the collet and the upper end surface of the spindle hub.

Further, the other end side of the second swing arm 24, which is engaged with the first swing arm 23 via the protruding piece 23 a attached to the side edge of the first swing arm 23, The head portion 10 which is pushed down against the spring 26 and is engaged with the spring 26 is brought into contact with the surface of the floppy disk 50.

On the other hand, when ejecting the floppy disk 50 from the magnetic disk device 2 which has operated the eject button 20, the operation pin 22 of the first swing arm 23 is pushed by pushing the eject button 20. The inclined cam 31 is moved down along the inclined surface of the inclined cam 21 to the lower end surface thereof, and the other end of the first swing arm 23 is pushed upward by the spring 25.

Further, the second swing arm 24 which is interlocked with the first swing arm 23 is also pushed up by the spring 26 in conjunction with the first swing arm 23, so that the chucking of the floppy disk 50 is released, The floppy disk 50 is ejected from the insertion opening of the front bezel 1 by the return spring.

[0034]

[Effect of device]

 As apparent from the above description, according to the present invention, a predetermined inclined cam is integrally formed in the middle of the eject lever, and the chucking mechanism of the floppy disk is vertically moved up and down on the inclined cam of the eject lever. Since the operating pin of the first swing arm is elastically contacted, the operating pin of the first swing arm moves along the cam surface of the inclined cam due to the sliding action of the eject lever, and the chucking mechanism of the floppy disk is Moved up and down.

Therefore, unlike the conventional structure, the link lever for moving the clamp member of the floppy disk up and down by the operation of the eject lever and the parts such as the connecting pin are unnecessary, and the man-hours for processing the parts and the assembly process are not required. Cost can be reduced by reducing the number of man-hours.

[Brief description of drawings]

FIG. 1 is an enlarged perspective view of an essential part of a magnetic disk device according to the present invention, showing the relationship between an eject lever and a first swing arm.

FIG. 2 is an explanatory diagram showing a relationship between a cam shape of the eject lever and an operating pin of a first swing arm.

FIG. 3 is a top view of a 5-inch magnetic disk drive according to the present invention showing a state in which a top cover is removed.

FIG. 4 is a bottom view of the same 5-inch magnetic disk device.

[Explanation of symbols]

 25-inch magnetic disk device 8 chucking mechanism 20 eject button 21 inclined cam 21a first cam surface 21b second cam surface 21c upper end surface 22 actuating pin 23 first swing arm 25 coil spring 28 spindle 31 eject lever 50 floppy disk

Claims (1)

[Scope of utility model registration request] 1. A magnetic disk device in which a chucking mechanism of a floppy disk is operated by a sliding operation of an eject lever, wherein an inclined cam having a predetermined gradient is integrally formed in a middle part of the eject lever, A magnetic disk device characterized in that an operating pin of a swing arm for vertically moving a chucking mechanism of a floppy disk is elastically contacted with the inclined cam of.