JP2000207970A - Switch-fixing structure of electronic apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately position and surely fix a switch without forming a fastening means, such as a screw or a claw shape. SOLUTION: This fixing structure of a switch 1 for an electronic apparatus is composed, by fixing the switch 1 for detecting an opening-closing operation (mechanical operation) of an opening-closing door to a switch fixing part (casing) 7. In this case, the fixing structure is composed by integrally forming a guide (switch-mounting part), switch positioning bosses (switch-positioning parts) 4a, 4b and guide bosses (switch connector insertion parts) 5a, 5b on the switch-fixing part (casing) 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switch fixing structure for electronic equipment such as an image forming apparatus such as a laser beam printer (LBP), a copying machine, a facsimile and the like.

[0002]

2. Description of the Related Art The operation, fixing method and assembling method of a switch in a conventional electronic apparatus will be described below with reference to an opening / closing door for exchanging a cartridge of a laser beam printer.

FIG. 10 is a cross-sectional view of a laser beam printer. In the laser beam printer, recording paper P loaded on a main body cassette 31 is picked up by a paper feed roller 32 and separated one by one by a separation pad 33. Only the uppermost recording paper P is transported along the guide 34 to the pair of registration rollers 35a and 35b.

Thereafter, the recording paper P is conveyed in accordance with the rotation of an electrophotographic photosensitive drum 37 provided in a process cartridge 36 as recording means, and a toner image formed on the photosensitive drum 37 is recorded by a transfer roller 38. It is transferred onto paper P. Then, the recording paper P to which the toner image has been transferred is guided by the conveyance guide 39 and the entrance guide 46, guided to the fixing roller 40 and the pressure roller 41, and
The toner image is fixed by being heated and pressed by 0 and 41.

The recording paper P on which the toner image has been fixed
Is conveyed along the paper discharge conveyance guide rib 42, and the face down tray 44 is conveyed by a pair of paper discharge rollers 43a and 43b.
Loaded on top.

By the way, a laser beam printer includes:
An opening / closing door 10 used for exchanging and maintaining consumables such as the process cartridge 36 is provided. If the opening / closing door 10 is not completely closed, the laser light is prevented from being emitted to the outside from the viewpoint of safety and the like. Or the drive device is not operated. The opening and closing of the door 10 is detected by a switch.

Here, the configuration and operation of detecting the opening and closing of the opening and closing door 10 will be described with reference to FIGS. 11 and 12. FIG.

In FIG. 11, 1 is a switch, 10 is an opening / closing door rotatably supported by an exterior 49, 2 is a switch lever rotatably supported to press the switch 1,
Reference numeral 50 denotes a cam fixed to the opening / closing door 10. The cam 50 turns the switch lever 2 to operate the switch 1. The switch 1 is fixed to the main body side mounting portion 47 by fixing screws 48a and 48b, and the connector 3 is inserted into a terminal of the switch 1 and connected thereto.

Thus, as shown in FIG.
Is closed, the cam 10 fixed to the door 10
Touches the switch lever 2 and pushes the switch 1 to turn it on.

[0010]

However, in the structure of the conventional detection mechanism, the switch 1 is fixed to the fixing screws 48a, 4a.
In order to fix the switch 1b, it is necessary to regulate the tightening force of the fixing screws 48a and 48b so that the switch 1 is not broken.

Further, the fixing hole formed in the small switch 1 is small, so that only small fixing screws 48a and 48b can be used. Therefore, switch 1
Is fixed to the mounting portion 47 which is a molded product of plastic or the like, a fixing screw 48 for a small hole having a diameter of φ2 mm or less.
a, 48b are few, and fixed screws 48a, 48
Since the fastening force of b is weak, another member is often required.

Further, since the load due to the weight of the connector 3 and its lead wire, the urging force, and the switch operating force concentrate on the screw fixing portion of the switch 1, the switch 1 may be deformed or broken.

On the other hand, there is a method in which an elastic hooking claw or the like is formed on a fixing portion to fix the switch without using a screw.
In this method, the mold structure becomes complicated, and it is necessary to secure high strength to the nail so that the nail is not broken or deformed at the time of molding and after molding, and it is necessary to appropriately select a material of the fixing portion. Subject to the restrictions.

Therefore, the first object of the present invention is to
An object of the present invention is to provide a switch fixing structure of an electronic device which can position a switch with high precision and securely fix the switch without requiring a fastener such as a screw or a claw shape.

Further, since the connector 3 can be inserted upside down with respect to the switch 1, there is a possibility that a wrong assembly may occur unless care is taken during assembly.

Therefore, the second object of the present invention is to:
An object of the present invention is to provide a switch fixing structure of an electronic device that can prevent a connector from being mistakenly assembled into a switch.

By the way, the operation accuracy of the switch 1 is determined by the maker, and the configuration for operating the switch 1 is ensured even if the dimensions of each component constituting the switch 1 vary within the specified dimensional tolerance of each component. It must be working. In general, the smaller the number of components,
Variations in dimensions can be kept small.

As shown in FIG. 13, when the exterior 49 and the opening / closing door 10 supported by the exterior 49 are assembled to the main body, the cam 50 attached to the opening / closing door 10 is hooked on the switch lever 2, and the switch lever 2 is deformed. Or the switch 1 may be destroyed.

Therefore, the third object of the present invention is to:
An object of the present invention is to provide a switch fixing structure of an electronic device which can prevent deformation of a switch lever and breakage of a switch when assembling an opening / closing door.

[0020]

According to an aspect of the present invention, there is provided an electronic apparatus comprising: a switch for detecting a mechanical operation fixed to a housing; The switch, the switch positioning part, and the switch connector insertion part are formed integrally with the housing.

According to a second aspect of the present invention, in the first aspect of the present invention, a concave or convex rail is formed at a position asymmetric with respect to the width direction of the connector, and a guide for the rail is formed on the housing. It is characterized by having done.

According to a third aspect of the present invention, in the first or second aspect of the present invention, a surface for pressing a switch according to the opening / closing operation of the opening / closing door after assembly and a surface for pushing down a switch lever when assembling the opening / closing door are provided. The cam having the opening and closing door is provided on a hinge portion of the opening and closing door.

Therefore, according to the first aspect of the present invention, the switch fixing structure of the electronic device is formed by the switch mounting portion, the switch positioning portion, and the switch connector insertion portion formed integrally with the housing. The switch can be accurately positioned and securely fixed without the necessity of forming a tool or a claw shape.

According to the second aspect of the present invention, since the concave or convex rail is formed at a position asymmetric with respect to the width direction of the connector, the connector is not assembled upside down with respect to the switch. An error in assembling the connector to the switch is reliably prevented.

According to the third aspect of the present invention, since the cam having the surface that pushes down the switch lever when assembling the door is provided, deformation of the switch lever and destruction of the switch when assembling the door can be prevented. .

[0026]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

First Embodiment First, the basic structure and operation of a laser beam printer having a switch fixing structure according to the present invention will be described with reference to FIG.

FIG. 1 is a sectional view of a laser beam printer. In this laser beam printer, recording papers P loaded on a main body cassette 31 are picked up by a paper feed roller 32 and separated one by one by a separation pad 33. Then, only the uppermost recording sheet P is transported along the guide 34 to the pair of registration rollers 35a and 35b.

Thereafter, the recording paper P is conveyed in accordance with the rotation of the electrophotographic photosensitive drum 37 provided in the process cartridge 36 as recording means, and the toner image formed on the photosensitive drum 37 is recorded by the transfer roller 38. It is transferred onto paper P. Then, the recording paper P to which the toner image has been transferred is guided by the conveyance guide 39 and the entrance guide 46, guided to the fixing roller 40 and the pressure roller 41, and
The toner image is fixed by being heated and pressed by 0 and 41.

The recording paper P on which the toner image has been fixed
Is conveyed along the paper discharge conveyance guide rib 42, and the face down tray 44 is conveyed by a pair of paper discharge rollers 43a and 43b.
Loaded on top.

By the way, a laser beam printer includes:
An opening / closing door 10 used for maintenance such as replacement of consumables such as the process cartridge 36 and jam clearance is provided. When the opening / closing door 10 is not completely closed, a laser beam is not supplied from the viewpoint of safety or the like. And the drive unit does not operate.

Next, the structure and operation of detecting the opening and closing of the opening and closing door 10 will be described with reference to FIGS.

In the figure, 1 is a switch, 10 is an exterior 4
9, an opening / closing door rotatably supported by 9; a switch lever rotatably supported to press the switch 1;
Is a cam fixed to the door 10. The cam 11 has a switch operating surface 11a which comes into contact with the switch lever 2 to actuate it, and a switch protection surface 11b for pushing the switch lever 2 in the operating direction of the switch 1 when assembling the opening / closing door 10. Is formed.

FIG. 4 shows the state of the open / close detecting mechanism when the open / close door 10 is closed. In this state, the switch lever 2 is pressed by the operating surface 11a of the cam 11, and the switch lever 2 is pressed. As a result, the push button 1a of the switch 1 is pressed, and the switch 1 is in the ON state.

When the opening / closing door 10 is opened as shown in FIGS. 2 and 3, the operating surface 11a of the cam 11 moves away from the switch 1.
a returns to rotate the switch lever 2, and the switch 1 is turned off. The push button 1a of the switch 1 is urged by a built-in spring (not shown). or,
In the present embodiment, the cam 11 causes the switch lever 2
Although the configuration in which the switch 1 is operated through the above is shown, a configuration in which the switch 1 is directly operated by the cam 11 may be adopted.

FIG. 5 shows a state in which the opening and closing door 10 is assembled to the main body. If the opening and closing door 10 is assembled in a state where it is raised (opened), the opening and closing door 10 is naturally weighed by its own weight. In order to assemble the door 10 stably, it is better to assemble the door 10 in a closed state.

Therefore, in this embodiment, the opening / closing door 10 is assembled with the door 10 closed. That is, the exterior 49 to which the opening / closing door 10 is attached is attached to the main body by -X.
It was assembled to the main body in the direction (vertically downward).

When the exterior 49 is lowered, the switch operating surface 11a of the cam 11 fixed to the hinge portion 10a of the opening and closing door 10 integrally or separately is bent by the bent portion 2a of the switch lever 2.
When the exterior 49 is further lowered in the −X direction, the cam 11
The switch lever 2 is rotated in the -Z direction (clockwise) around the support portion (lower end) of the switch 1 by the switch operating surface 11a to push the push button 1a of the switch 1, whereby the switch 1 is turned on. State. Therefore, when the exterior 49 and the opening / closing door 10 supported by the exterior 49 are assembled to the main body, the cam 11 does not get caught on the switch lever 2 and the switch lever 2 is not deformed and the switch 1 is not broken.

Next, the configuration of the switch 1 and its mounting structure will be described with reference to FIGS. In addition, the example of a shape shown below assumes the case where the fixing | fixed part 7 is comprised by molding resins, such as plastic.

In FIG. 6, reference numeral 1 denotes a switch, 2 denotes a switch lever rotatably supported by the switch 1, 3 denotes a connector connected to the switch 1, 7 denotes a switch fixing portion of the electronic apparatus body, and 4a and 4b denote switches. The switch positioning bosses on the switch fixing part 7 side, 14a and 14b are fixed positioning holes on the switch 1 side, 8 is a guide rail of the connector 3, 5a and 5
b is a boss that engages and guides the guide rail 8 of the connector 3, and 6 is a guide for guiding the connector 3.

FIG. 7 is a perspective view of FIG. 6 as viewed from the back side of the fixing portion 7, and shows the fixing positioning bosses 14a, 14a of the switch 1.
7 shows a state after b is inserted into the switch positioning bosses 4a and 4b. In FIG. 7, 13a, 13b, 13
c is a connector terminal for inserting the switch terminals 9a, 9b, 9c.

Here, a method of assembling the switch 1 will be described.

After the positioning holes 14a, 14b of the switch 1 are inserted into the positioning bosses 4a, 4b of the fixing portion 7 in the -Y direction, the terminals 13a, 13b, 13c of the connector 3 are connected to the switch terminals 9a, 9b, 9c. The switch 1 is fixed to the fixing portion 7 by being inserted all the way in the Z direction, and is connected to the connector 3. At this time, the positioning boss 4
The X and Z directions of the switch 1 and the Y direction of the connector 3 are fixed by a and 4b, and the Y direction of the switch 1 and the Z direction of the connector 3 are fixed by the fitting force of the connector 3. In this case, the guide 6 may regulate the −X direction of the connector 3.

The bosses 5a, 5b and the guide rail 8 of the connector 3 are used to prevent the switch terminals 9a, 9b, 9c from being deformed when the switch terminals 9a, 9b, 9c are inserted into the connector terminals 13a, 13b, 13c. Serves as a guide. Here, an example in which two bosses 5a and 5b are provided has been described, but only one of them may be provided.

As described above, according to the present embodiment, the switch 1 can be positioned with high precision and securely fixed without the necessity of forming fasteners such as screws or claw shapes.

When the fixing portion 7 is a resin molded product or the like,
The positioning bosses 4a and 4b and the bosses 5a and 5
The guide b and the guide 6 can be formed in two directions of the dividing directions X and Y of all the dies.

By the way, as shown in FIG.
Is formed at a position asymmetrical with respect to the width center line d of the connector 3 (that is, a position offset downward), so that the connector 3 is not assembled upside down with respect to the switch 1. The connector 3 can be securely prevented from being incorrectly assembled to the switch 1.

In the present embodiment, the guide rail 8 of the connector 3 is formed as a concave groove, and the bosses 4a and 4b engaging with the guide rail 8 are formed as a convex shape. good.

In this embodiment, the example in which the switch 1 is turned on by pressing the push button 1a of the switch 1 has been described. However, a switch that is turned off by pressing the push button (pressing the push button). Accordingly, the present invention can be similarly applied to a case where a switch that turns off an internal contact or a switch that is turned off in an electric circuit) is used.

<Second Embodiment> Next, a second embodiment of the present invention will be described with reference to FIG.

In the first embodiment, the case where the fixing portion 7 is a resin molded product such as plastic is described. In the present embodiment, the case where the fixing portion 7 'is formed of a sheet metal will be described.

In the present embodiment, the switch positioning bosses 4a 'and 4b' on the fixed portion 7 'side are formed by embossing or burring, and the bosses 5a' and 5b 'are formed by cutting and raising, and the guide 6'. Are formed by bending.

After inserting the positioning holes 14a, 14b of the switch 1 into the positioning bosses 4a ', 4b' of the fixed portion 7 'in the -Y direction, as in the first embodiment, the connector 3 side By inserting the terminals 13a, 13b, and 13c into the switch terminals 9a, 9b, and 9c as far as they will go in the Z direction, the switch 1 is fixed to the fixing portion 7 'and connected to the connector 3. At this time, the positioning bosses 4a ', 4
The X direction and the Z direction of the switch 1 and the X direction of the connector 3 are fixed by b ′, and the connector 3 is fixed by the guide 6 ′.
Are fixed, and the Y direction of the switch 1 and the Z direction of the connector 3 are fixed by the fitting force of the connector 3. In this case, the guide 6 'may receive the X direction of the connector 3.

The bosses 5a ', 5b' and the guide rail 8 of the connector 3 are connected to the connector terminals 13a, 13b, 13c.
When the switch terminals 9a, 9b, 9c are inserted into the switch terminals 9a, 9b, 9c, they function as guides for preventing the switch terminals 9a, 9b, 9c from being deformed. Here, an example in which two bosses 5a 'and 5b' are provided has been described, but only one of them may be provided.

[0055]

As is apparent from the above description, claim 1
According to the described invention, a switch fixing structure of an electronic device is configured by a switch mounting portion, a switch positioning portion, and a switch connector insertion portion formed integrally with a housing, so that a fastener such as a screw or a claw shape needs to be formed. The effect is obtained that the switch can be positioned with high precision and fixed securely without the switch.

According to the second aspect of the present invention, since the concave or convex rail is formed at a position asymmetrical with respect to the width direction of the connector, the connector is not assembled upside down with the switch. This has the effect of preventing the connector from being incorrectly assembled to the switch.

According to the third aspect of the present invention, since the cam having the surface that pushes down the switch lever when assembling the opening / closing door is provided, deformation of the switch lever and destruction of the switch when assembling the opening / closing door are prevented. The effect is obtained.

[Brief description of the drawings]

FIG. 1 is a sectional view of a laser beam printer including a switch fixing structure according to a first embodiment of the present invention.

FIG. 2 is a partial side view showing a switch fixing structure (when an opening / closing cover is opened) according to Embodiment 1 of the present invention.

FIG. 3 is a partial plan view showing a switch fixing structure according to the first embodiment of the present invention.

FIG. 4 is a partial side view showing the switch fixing structure (when the open / close cover is closed) according to Embodiment 1 of the present invention.

FIG. 5 is a partial side view showing a state when the opening / closing cover is assembled in the first embodiment of the present invention.

FIG. 6 is an exploded perspective view showing the switch fixing structure according to the first embodiment of the present invention.

FIG. 7 is a perspective view of FIG. 6 as viewed from the back side of the fixing unit.

FIG. 8 is a side view of the connector.

FIG. 9 is an exploded perspective view showing a switch fixing structure according to Embodiment 2 of the present invention.

FIG. 10 is a cross-sectional view of a laser beam printer having a conventional switch fixing structure.

FIG. 11 shows a conventional switch fixing structure (when an opening / closing cover is opened).
FIG.

FIG. 12 shows a conventional switch fixing structure (when the opening / closing cover is closed).
FIG.

FIG. 13 is a partial side view showing a state when a conventional opening / closing cover is assembled.

[Explanation of symbols]

 Reference Signs List 1 switch 2 switch lever 3 connector 4a, 4b switch positioning boss 5a, 5b guide boss 6 guide 7 switch fixing portion 8 guide rail 10 opening / closing door 11 cam 11a switch operating surface 11b switch protective surface 14a, 14b fixed positioning boss

Claims (3)

[Claims] 1. A switch fixing structure for an electronic device, comprising a switch for detecting a mechanical operation fixed to a housing, wherein a switch mounting portion, a switch positioning portion, and a switch connector insertion portion are integrally formed in the housing. A switch fixing structure for an electronic device, characterized in that: 2. The electronic device according to claim 1, wherein a concave or convex rail is formed at a position asymmetric with respect to the width direction of the connector, and a guide for the rail is formed on the housing. Switch fixed structure. 3. A hinge having a surface for pressing a switch according to an opening / closing operation of the opening / closing door after assembly and a surface for pressing down a switch lever when assembling the opening / closing door is provided at a hinge portion of the opening / closing door. A switch fixing structure for an electronic device according to claim 1.