JPH0632203B2 - Switch mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The invention of the present application generally relates to a recording or reproducing apparatus, an electronic apparatus including the recording or reproducing apparatus, or improvements in various mechanisms suitable for these.

For example, in a magnetic disk recording or reproducing apparatus such as a floppy disk drive (hereinafter referred to as FDD), a holder for housing a magnetic disk cassette is provided.
Many of the holders are configured to be automatically lowered when the cassette is inserted to a predetermined position, so that the cassette is mounted at a predetermined recording or reproducing position.

By the way, in the above-mentioned recording or reproducing apparatus such as FDD, or other equipment, various detection switches and operation switches are provided, but structurally, an operation member for operating the switch contact piece. Is supported by a supporting member attached to the substrate.

However, in the conventional switch mechanism, when the switch mechanism is configured on the substrate, a means such as press-fitting the support member into the hole provided in the substrate is adopted, resulting in poor workability and increased cost. It was a thing.

Therefore, in the invention of this application, when the switch mechanism having the above-described configuration is configured on the substrate, the work is extremely simplified particularly when the supporting member is mounted on the substrate, and the cost is greatly reduced by the automatic operation. It is an object of the present invention to provide a novel switch mechanism that can be downed.

In order to achieve the above object, according to the present invention, there is provided a switch mechanism arranged at a predetermined position on a chassis (chassis 1 in the embodiment) of an apparatus for controlling the operation of the apparatus, the switch mechanism comprising: A movable contact piece (a switch piece 45 in the embodiment) that constitutes an electric contact, an operation member (a switch knob 47 in the embodiment) for operating the movable contact piece to turn on and off the switch, and the operation member. A support member (a sleeve 46 that is outsert-molded on the chassis 1 and supports a switch knob 47 in this embodiment) that supports the switch movably in the on / off direction is provided on the chassis. A switch mechanism configured to be mounted on the upper mounting position by Actsert molding using a synthetic resin material was adopted.

In this way, since the support member is attached to the mounting position on the chassis by outsert molding of synthetic resin material, the mounting of the support member on the chassis is remarkably simplified, and automation can significantly reduce the cost. become.

The above invention of this application, or the object of the invention other than the above,
The configuration, operational effects, and characteristic points will be apparent from the description of the embodiments below with reference to the accompanying drawings.

Hereinafter, preferred embodiments of the invention of this application will be described with reference to the accompanying drawings.

FIGS. 4 (a) and 4 (b) show the front and back of a 3.5 "standard micro floppy disk, showing the state in which the shutter is open.

10 is a disk cartridge (abbreviation cassette),
Reference numeral 10a is a head window for contacting the medium 11 in the cassette and a drive-side magnetic head (not shown). Reference numerals 10b and 10b 'are reference holes for positioning the cassette in the drive, and 10c and 10c'.
Is a preliminary hole for another function (for example, auto eject).

Reference numeral 11 is a recording medium (media), 12 is a metal hub for positioning and rotating the medium, and the medium and the metal hub are joined by a double-sided tape or an adhesive (not shown). The metal hub is provided with a spindle hole 12a and a drive pin hole 12b for receiving a power source on the drive side.

Reference numerals 14 and 15 (shown by broken lines) refer to the drive-side motor spindle and drive pins.

10d is a shutter V groove, 10e is a shutter V groove angle, 13
Is a shutter.

FIG. 1 is an overall plan view of the embodiment apparatus, in which 10 is a cassette, 20 is a cassette holder for holding the cassette 10, and 20a is a caulking formed by cutting and raising a part of the ceiling of the cassette holder 20. Two legs form a pair. 21
Is a leaf spring for pushing the cassette 10 which is appropriately pushed. As shown in FIGS. 5 (a) and 5 (b), the two holders 20a are swung in the directions of arrows A and B, and the cassette holder It is fixed on 20.

22 and 22a respectively include a roller 23 and a cassette holder 20.
It is a roller shaft that is rotatably supported by the two roller shafts 22, 2
As shown in FIG. 6, the springs 30 and 31 are provided on the roller 2a 2a.
The groove 22b is formed so as not to rub against it.

A shutter lever 24 and a latch 25 are rotatably attached with a shaft 26 fixed on the cassette holder 20 as a fulcrum. Details of the mounting portion are shown in FIG. A shutter spring 24b fixed to a spring hook 24a formed by cutting and raising a part of the cassette holder 20 at the other end is stretched over the shutter lever 24.

On the other hand, the latch 25 is a mold member, and the tip of the integrally molded thin piece 25b abuts a hook 25a formed by cutting and raising the cassette holder 20 and is bent in a bow shape. A shutter pin 24c is provided on the lower surface of the tip of the shutter lever 24.

As shown in FIG. 8, a part of the cylindrical surface of the shutter pin 24c is a flat surface, and when the shutter 13 is completely opened, the shutter pin 24c is not completely inserted into the shutter V groove 10d. The groove angle 10e and the flat surface portion of the shutter pin 24c are in contact with each other.

At this time, the center of the shutter pin 24c is sized so as to be positioned within the end surface 13a of the shutter 13, and the shutter pin 24c slips out of the shutter V groove 10d even if the shutter 13 is closed (in the direction of arrow D). There is no end. In FIG. 8, the shutter pin 24c is biased in the direction of arrow C by the shutter spring 24b.

Reference numerals 27 and 27 are side plates, and 28 is a U-shaped lift plate.

27a is a regulation tab formed by cutting and raising a part of the side plate,
This prevents the spring 30 from being accidentally bent in the direction of arrow E in FIG. 9 and permanently deformed.

In FIG. 9, 40 is a spindle motor rotor, 41
Is a rotor shaft, 42 is a spindle motor circuit board, 43 is a motor coil, and 44 is a hook for stopping the board, which is made of synthetic resin and is injection-molded (outsert-molded) on the chassis 1. Reference numeral 45 is a switch piece, 46 is a sleeve actacted on the chassis 1, and 47 is a switch knob. An enlarged sectional view of these is shown in FIG. The switch knob 47 is pushed up by the spring force of the switch piece 45 and moves up and down according to the up and down movement of the cassette 10.

Although the above-mentioned members constitute a cassette detection switch, a write protect detection switch, an injection end detection switch and the like are also provided in the same configuration in addition to this.

In the present embodiment, the three detection switches are the first
As shown in FIGS. 1A and 1B, they are integrally configured.

That is, in the figure, the switch piece 45 has three arm portions 45a, 45b, 45c for each switch and is formed by a conductive elastic leaf spring, and the lower bent portions 45d, 45e at the center thereof are the tip ends. Is the claw part, and the circuit board 4
It is attached to the substrate 42 by being inserted through the slit formed in 2 and bent to the back surface side, and is connected to the ground on the circuit.

Each arm 45a, 45b, 45c has a connection point 4
5'a, 45'b, 45'c, each of which is a substrate 4
The fixed contacts 42'a, 42'b, 42'c on the upper surface 2 are opposed to each other. Also, for each arm 45a, 45b, 45c,
Knobs 47a, 47b, 47c are provided respectively. In FIG. 11 (b), 42a, 42b and 42c are signal line conductor patterns, and 42d is a ground conductor pattern.

In the above, the contacts 45'a-42'a, 45'b-4
2'b, 45'c-42'c constitute each of the three switches, and therefore the knobs 47a,
47b and 47c move up and down depending on the presence / absence of a cassette, the presence / absence of a write protect, and the presence / absence of the end of ejection to bring the contacts into or out of contact with each other.

FIG. 12 shows a main circuit including the above three switches.
80a, 80b, 80c are pull-up resistors, 81a,
81b and 81c are capacitors, 82a, 82b and 82c
Is an inverter, and ON / OFF of each switch is output as high and low signals from each inverter 82a, 82b, 82c.

Returning to FIG. 1, reference numeral 29 is a button for the operator to push out the loaded cassette and take it out. The button 29 is fixed to the lift plate 28, and the fixing method is the first.
It is shown in FIGS. 3 (a) and 3 (b). That is, at the same time when the protrusion 2 protruding from the lift plate 28 is inserted into the groove 28 a of the lift plate 28 and the groove of the ear 29 a of the button 29.
8b is inserted into the meat relief groove 29b of the button 29 to be joined. 14 (a) and 14 (b) show a modified example of the method of attaching the operation button 29, in which the notch 29c formed in the button 29 is inserted into and coupled to the window 28c instead of the protrusion 28b.

On the other hand, in FIG. 1, reference numeral 32 is a molded eject lever, 32a is a thin piece integrally formed with the eject lever 32, and 32b is a projection formed on the chassis 1 to support the thin piece 32a. The eject lever 32 is rotatably supported by a shaft 32c formed on the chassis 1.

In FIG. 1, reference numeral 50 indicates a head carriage member including a magnetic head, a head pressing spring, a head carrier, and the like, 51 a head cable, 52 a guide bar which serves as a sliding guide of the head carriage member 50, 53,
53 is a guide bar retainer for fixing the guide bar 52 to the chassis 1, 54 and 54 are fixing screws for the guide bar retainer 53,
55 and 56 are 0 position stoppers of the carriage member 50 and their fixing screws, 57 and 58 are track 0 detecting sensors and their fixing screws, 59 is an adjusting cam for adjusting and moving the mounting position of the track 0 detecting sensor 57, Reference numerals 60 and 61 are step motors and their fixing screws, 62 is an eccentric dowel for adjusting and moving the mounting position of the step motor 60, and 63.
Is a lead screw, 70 is an electric circuit board, 71 is an I / O connector fixed on the electric circuit board 70, and details thereof are as shown in FIG. That is, the connector 7
The connector pin 71a of No. 0 is in an upright relationship with the substrate 70 and is downsized as compared with the case of the conventional lateral pin.

Reference numeral 2 is a bezel, and reference numerals 3 and 4 are attachment members, both of which are fixed to the chassis 1.

Here, the details of the bearing portion on the carriage member 50 side with respect to the carriage guide bar 52 will be described with reference to FIG.

The carriage member 50 has a sliding portion 50a for the bar 52,
50b, which are provided with shafts 83, 84. Here, the bearing 8 fitted to the sliding portions 50a and 50b
When inserting the guide bar 52 into the bearings 3, 84, the bearings 83, 8
In order to eliminate the passage error between the four bearings, a reference guide bar that is slightly thicker than the guide bar 52 that is normally used at the beginning is used for the bearing 8.
Bearings 8 inserted into 3, 84 and press-fitted and fixed at this time
Passing through the bearing 84 that is loosely press-fitted based on 3,
After moving in a direction to reduce the error and positioning, the adhesive 85 fixes the sliding portion 50b.

Then, after the bearing 84 is completely fixed with the adhesive 85, the ordinary guide bar 52 is inserted and assembled, so that the bearings 83 and 84 having the same error condition are always obtained.

In order to make the above adjustment possible, the sliding portion 50a is a cylinder portion having a circular hole, while the sliding portion 5 is
0b is provided with a U-shaped hole.

In this embodiment, the resin functional member that positions and holds the carriage guide bar 52 by outsert molding is formed.

Conventionally, an AlDC (aluminum die cast) base or the like is secondarily processed, a guide bar is placed on a highly accurate portion, and it is screwed and fixed by a pressed thin spring plate.

According to this embodiment, the portion for holding and positioning the guide bar by outsert molding and the portion for pressing the guide bar can be machined in one shot, so secondary machining can be eliminated and parts can be reduced, resulting in a significant cost reduction. Became.

Next, the description will be made with reference to FIGS. 17 (a) to (d).

FIG. 17 (a) is a diagram immediately after outsert molding.

A pressing member 53 is outsert-molded on the chassis 1 such that its shaft portion 53a is rotatable.

86 is a guide bar positioning and holding member, and a tap hole 87 is formed in the chassis 1 so as to face the guide bar positioning and holding member.

Reference numeral 88 is a member that fixes 86 to the chassis, and 89 is a screw.

FIG. 17 (b) is a sectional view taken along line (b)-(b) of FIG. 17 (a).

FIG. 17C shows a state in which the guide bar 52 is fixed.

After the guide bar 52 is placed on the holding member 86, the guide bar 53 is rotated, and the guide bar 52 is pressed by the force generated by the deflection of the tip of the guide bar 53. The pressing member 53 is fixed by the screw 89. is doing.

FIG. 17D is a sectional view taken along the line (d)-(d) of FIG. 17C, and the height direction of the guide bar 52 is extended by the holding member 86.

The lateral position accuracy is obtained by the protruding edge 1b of the opening 1a of the chassis 1.

In this embodiment, the 0 position stopper of the carriage 50 is also formed by outsert molding, and adjustment is possible.

Conventionally, a separate member is used for the 0 position stopper, which causes problems in cost and assembly.

In this embodiment, by forming the 0 position stopper by outsert molding, adjustment can be simplified and cost can be reduced.

This will be described with reference to FIGS. 18 (a) and 18 (b).

As shown in FIG. 18 (a), an outsert-molded 0 position stopper 55 is rotatably attached to the chassis 1, and a long hole 55 a is formed in a part thereof. Reference numeral 73 is a tap hole formed in the chassis 1.

FIG. 18B shows a state in which the head carriage 50 is fixed as a 0 position stopper, and is adjusted by the long hole 55a. Reference numeral 56 is a 0 position stopper fixing screw.

In this embodiment, the position adjustment of the carriage drive step motor, the lead screw, and the track 00 detection photocoupler is performed by outsert molding by an eccentric dowel formed on the base.

Conventionally, it was necessary to use a separate member or a jig for the above adjustment, and there was a problem in terms of cost and the like.

In the present embodiment, by forming the eccentric dowel by outsert molding, it is possible to simplify the adjustment and reduce the cost.

This will be described with reference to FIGS. 19 to 21.

FIG. 19A shows an eccentric dowel 62 formed on the chassis 1 by the outsert molding method. FIG. 19 (b) is a sectional view thereof.

FIG. 20 shows an example used for adjusting the position of the carriage drive step motor 60 and the lead screw 63 in the front-rear direction. In the figure, 60 is a step motor, 74 is a pressed holder, 75 is an outsert-formed positioning dowel, and 63 is a lead screw.

FIG. 21 shows an example used for position adjustment of the track 00 detection photocoupler. In the figure, 66 is a photo coupler,
67 is a fixing screw, 68 is a positioning dowel, and 62 is an eccentric dowel.

Next, the disk drive motor will be described with reference to FIG.

In the figure, 91 is a rotor yoke, and a permanent magnet 92 is attached to the inside thereof.

Reference numeral 93 is a printed circuit board on which a control circuit of a direct drive (DD) motor and a drive coil 94 are mounted.

Here, the chassis 1 is made of, for example, a silicon steel plate, and is also used as a stator yoke of the motor.

In this way, by using the stator yoke of the DD motor and the chassis of the FDD as well, the step of mounting the DD motor can be omitted and the positional accuracy can be improved. Further, the simplification of the structure facilitates adaptation to automatic assembly.

96 is a housing, 97 is a bearing, 98 is a flange, 99
Is a rotary shaft, 101 is a cassette positioning pin attached to the stator / chassis 1, and 102 is a cassette height determining pin.

Next, the magnetic head assembly will be described with reference to FIGS.

In FIG. 23, reference numeral 50 denotes a head carriage member on which the zero-face head 112 is mounted, which is molded from synthetic resin such as polycarbonate.

Reference numeral 113 denotes a head arm on which a one-sided head (not shown) is mounted, and the head arm 113 and the head carriage 50.
Are connected by screws 115 via a leaf spring 114 integrated with the head arm 113.

Reference numeral 116 is a spring mounting arm for mounting a head arm spring 118 to generate a force (head pressure) for pressing the 0-sided and 1-sided head against a medium which is a recording medium.

Further, 117 is a hook arm for hooking the spring mounting arm 116. The spring mounting arm 116 and the hook arm 117 are integrally formed with the head carriage 50.

The details are shown in FIGS. 24 (a) and 24 (b). FIG. 24 (a) shows a state before the spring 118 is attached.

FIG. 24 (b) shows a state in which the spring 118 is attached.

In FIG. 24 (b), the head arm spring 11
8 is put in the spring mounting arm 116, bent at the hinge portion 116a as shown in the figure, the hook arm 117 is slightly displaced in the direction of arrow P, and hooked on the hook portion.

Since the hook arm 117 returns to the original state due to the spring property of the molding material, the spring mounting arm 116 is in the state shown in FIG. 24 (b), and the head arm spring 118 does not come off.

In this way, the spring can be attached without using a separate member for supporting the spring as in the conventional case, which is excellent in workability and can greatly contribute to cost reduction.

Next, the mounting and discharging operations of the cassette in the apparatus having the above-mentioned configuration will be described with reference to FIGS.

Each drawing is composed of a partial side view and a partial plan view thereof.
2 (a) and 2 (b) are in a cassette mounting waiting state, and the cassette 10 is slid in the direction of arrow G and inserted. The shutter lever 24, the latch 25, and the eject lever 32
Are located at their respective origin positions by the spring force.

When the cassette 10 is further slid, the shutter pin 2
4c contacts the shutter 13 to open the shutter 13 in accordance with the rotating operation of the shutter lever 24 (direction of arrow H in FIG. 2 (c)), and the front end surface of the cassette 10 is latched by the latch 2
It contacts the latch pin portion 25c formed on the lower surface of No. 5.

Further, when the cassette 10 is slid, the latch 25
Rotates in the direction of arrow I in FIG. 2 (c).

The R portion at the tip of the latch 25 is the corner portion 27 of the bent portion of the side plate 27.
When b is disengaged, the force of the spring 31 (twisted counterclockwise by a torsion torsion bar spring) (arrow J)
Then, as shown in FIG. 2D, the cassette holder 20 slides in the arrow K direction.

The surface of the side plate 27 on which the rollers 23 roll is partially cut away, and when the cassette holder 20 slides and the rollers 23 roll to the notches 27a, the cassette holder 20
This time, it moves down in the direction of arrow L by the force of the spring 31.

At this time, since the cassette 10 is regulated in the vertical direction by the cassette holder 20, the cassette 10 is lowered together with the cassette holder 20 to complete the mounting operation of the cassette 10 (FIGS. 2 (e) and (f)). .

On the other hand, in order to eject the cassette 10, when the operator pushes the button 29 and the lift plate 28 slides in the direction of the arrow M, the sloped portion 28b formed on the lift plate 28 contacts the roller 23 and the roller 23 is removed. Push up in the direction of arrow N (Figs. 2 (g) and (h)).

When the lift plate 28 is further pressed, the tip end portion 28c of the lift plate 28 contacts one arm of the eject lever 32, and the sliding motion of the lift plate 28 is transmitted to the eject lever 32, so that the eject lever 32
Rotates in the direction of arrow O, is pushed by the tip of one arm of the eject lever 32, and the cassette holder 20 slides in the direction of arrow P (FIGS. 2 (i) and (j)).

When the sliding operation of the cassette guide 20 reaches the position where the tip R of the latch 25 gets over the corner 27b of the bent portion of the side plate 26, the latch 25 is rotated in the direction of arrow Q by the spring force of the thin piece 25b to operate. Even if the person stops pressing the button, the cassette holder 20 is locked by the force of the spring 31 so as not to slide (FIGS. 2 (k) and (l)).

On the other hand, the structure of the latch 25 is such that the preliminary hole 10c 'of the cassette 10 is held by the latch hook 25d as shown in FIG.

That is, when the leading end of the cassette 10 does not contact the latch pin portion 25c, the latch hook portion 25d is not
Is located at a position where it does not interfere with the side surface of the (FIG. 3 (a)).

When the latch 25 is pushed in the direction of the arrow R by being pushed by the cassette 10, the latch hook portion 25d enters the preliminary hole 10c 'and holds the cassette 10 (Fig. 3 (b)).

When ejecting, the latch 25 rotates in the direction opposite to the arrow R, so that the cassette 10 is freed. Therefore, latch 2
The cassette 10 released from No. 5 is slid in the direction of the arrow T by the rotating operation (arrow S) of the shutter lever 24 urged by the shutter spring 24b, and the discharging operation is completed (see FIGS. 2 (k) and (k). l)).

The embodiments of the invention of this application are as described above.

As described above, according to the present invention, a movable mechanism arranged at a predetermined position on the chassis of the device, which is a switch mechanism for controlling the operation of the device, and which constitutes an electrical contact of the switch, An operating member that controls the switch to be turned on and off by operating the movable segment, and a support member that movably supports the operating member on the chassis in a direction of turning the switch on and off, are provided. Since a switch mechanism configured to be attached by outsert molding using a synthetic resin material at the attachment position on the chassis is adopted, when the switch mechanism is configured on the chassis, particularly regarding the attachment of the support member on the chassis, The work is extremely simplified, and automation can significantly reduce costs.

[Brief description of drawings]

FIG. 1 is an overall plan view of a floppy disk device to which the invention of this application is applied, and FIG.
(L) is an operation state diagram for explaining the loading and unloading operations of the cassette of the apparatus shown in FIG. 1, and FIGS. 3 (a) and 3 (b) are enlarged views of main parts for explaining the latching action, and FIG. a), (b)
Is a plan view and a bottom view showing the front and back of the magnetic disk cassette, and FIGS. 5 (a) and 5 (b) are partially enlarged cross-sectional views for explaining a method of attaching the cassette pressing leaf spring on the cassette holder. FIG. 7 is a partially enlarged cross-sectional view showing details of a roller mounting portion on the side of the cassette holder, FIG. 7 is a partially enlarged sectional view showing details of a shutter lever and latch mounting portion on the cassette holder, and FIG. 8 is a shutter pin. FIG. 9 is a partial plan view showing the relationship between the cassette and the shutter in the shutter open state, FIG. 9 is a side view showing the main part of the upper side surface in FIG. 1, and FIG. 10 is a detailed view of the configuration of the detection switch section. 11A and 11B are a partially enlarged sectional view showing a plan view and a side view showing a mechanical structure of three integrated detection switches, and FIG. 12 includes the switch shown in FIG. Main circuit diagram, 13 (a) and 13 (b) are an exploded perspective view and a sectional view in a mounted state for explaining a method of attaching the operation button, and FIGS. 14 (a) and 14 (b) show another method of attaching the operation button. FIG. 15 is an exploded perspective view for explaining and a sectional view in an attached state, FIG. 15 is a perspective view showing details of a connector, FIG. 16 is a partially enlarged perspective view showing details of a bearing portion of a carriage member, and FIG. 17 (a). ) Is a plan view of the main part of the chassis, (b) of the same figure is (b) -of the same figure (a).
(B) line sectional view, (c) is a plan view of the main part of the chassis for explaining the mounting state of the carriage guide bar, (d) is a line (d)-(d) in (c) of the same figure. Sectional view, 18th
FIGS. 19 (a) and 19 (b) are partial enlarged views for explaining attachment adjustment of the 0 position stopper of the carriage to the chassis, and FIGS. 19 (a) and 19 (b) are portions showing a position adjusting dowel on the chassis. FIG. 20 is an enlarged view and a sectional view, FIG. 20 is a plan view showing a position adjusting mechanism of a carriage drive step motor and a lead screw, and FIG. 21 is a plan view showing a position adjusting mechanism of a head track 00 position detecting photocoupler. 22 is a sectional view showing the structure of the disk drive motor,
FIG. 23 is an overall perspective view of the magnetic head assembly,
(A), (b) is explanatory drawing for demonstrating the attachment method of a head arm spring. 1 ... Chassis, 10 ... Cassette 20 ... Cassette holder 23 ... Roller, 24 ... Shutter lever 25 ... Latch, 27 ... Side plate 28 ... Lift plate 29 ... Button 32 ... Eject lever 44 ... Hook, 45 ... Switch piece 46 ... Sleeve, 47 ... switch knob 50 ... head carriage member 52 ... guide bar, 53 ... pressing member 55 ... 0 position stopper 59 ... sensor, 60 ... step motor 63 ... lead screw 83, 84 ... bearing

Claims (1)

[Claims] 1. Arranged at a predetermined position on the chassis of the device,
A switch mechanism for controlling the operation of the device, comprising a movable segment that constitutes an electrical contact of the switch, an operating member that operates the movable segment to turn on and off the switch, and the operating member. A support member for movably supporting the switch on and off is provided on the chassis, and the support member is attached to a mounting position on the chassis by outsert molding using a synthetic resin material. Switch mechanism.