JPH04249186A - Electronic machine - Google Patents

Abstract

PURPOSE:To provide an electronic machine which prevents the danger and injury arising from an interlock switch. CONSTITUTION:An interlock switch 155 is provided in a shielding body 152 having electric component parts 127 received therein and the one end of a link member 151 passing through the shielding body 152 is connected to a front cover 123. The other end of the link member 151 is reciprocally moved in response to the opening and closing of the front cover 123, thereby turning on and off the interlock switch 155. Since the interlock switch 155 is shielded by the shielding body 152, it can be protected thereby.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to electronic equipment such as laser beam printers and copying machines, and more particularly, the present invention is equipped with an interlock switch that turns off the power when the equipment is opened to ensure safety. The present invention relates to an image processing device.

[0002] Many electronic devices such as laser beam printers are equipped with an interlock switch, and when the inside of the device is opened, this switch detects this and automatically turns off the power. There is. Needless to say, this is to prevent situations such as electric shock when inspecting the inside of the device or injury due to inadvertent operation of electrical parts. In addition, recent PL (Pro
In view of the duct Liability (product liability) problem, an interlock switch is provided to prevent invisible laser light from being emitted unnecessarily.

FIG. 5 schematically shows the configuration of a laser beam printer as an example of a conventionally used electronic device. The main body 12 of the laser beam printer 11 is provided with a laser scanning device 13 on its upper part, and a photosensitive drum 15 is irradiated with a laser beam modulated according to an image signal. Parts such as a charge corotron 16, a developing device 17, a transfer corotron 18, and a cleaning device 19 are arranged around the photosensitive drum 15.

The charge corotron 15 has the role of uniformly charging the photosensitive drum 15. The charged photoreceptor drum 15 is scanned with a laser beam to selectively eliminate the charge, thereby forming an electrostatic latent image. The electrostatic latent image is developed by a developing device 17, and a toner image appears on the drum surface. This toner image is transferred from the cassette tray 21 to a sheet 23 fed out by a half-moon roller 22. The paper onto which the toner image has been transferred is fixed by the fixing device 24, and then discharged from the device.

[0005] In FIG. 5, the broken line represents the conveyance path 26 of the paper 23 sent out from the cassette tray 21. In electronic devices such as laser beam printers that are equipped with a mechanism for transporting paper, a jam (paper jam) may occur in the transport path 26. Therefore, in the laser beam printer shown in this figure, the upper device is divided into two parts with the transport path 26 as the border.
7 has a structure that can be freely opened and closed in the direction of arrow 29 with respect to the lower device portion 28. When the upper device portion 27 is opened, the actuator of the interlock switch 31 is not pressed down, and the supply of power (not shown) to the inside of the device is cut off.

[0006]

However, in such a laser beam printer or electronic device, when the inside of the device is opened, the interlock switch 31 is exposed. Therefore, for example, a situation may occur where a person working on electronic equipment accidentally places a tool on top of the interlock switch. becomes. In such cases, some equipment may be activated by instructions from an external device such as a host computer, and if high voltage is generated or the motor rotates as a result, there is a risk of harm to workers. there were.

[0007] Furthermore, depending on the device, there is a danger that, for example, a child may open the inside of the device without permission and activate the interlock switch, or forcibly disassemble the switch and turn on the power.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an electronic device that prevents harm from occurring due to an interlock switch that is originally provided to ensure safety.

[0009]

[Means for Solving the Problems] The present invention includes a first unit that accommodates electronic components, a shield such as a chassis that shields the first unit from the outside, and a shield that can be opened and closed with respect to the first unit. a second unit disposed in the shielding body, one end of which is attached to the second unit, the intermediate portion of which is passed through a hole drilled in a predetermined position of the shield, and the second unit is reciprocated in response to opening and closing of the second unit; The electronic device is provided with a rod-shaped member that performs the above-described operations, and an interlock switch that is placed on the other end side of the rod-shaped member in the first unit and is controlled to be turned on and off in accordance with the opening and closing operations of the second unit.

That is, in the present invention, an interlock switch is disposed within the first unit, and the first unit is shielded from the outside. Further, a hole is bored at a predetermined position in the shielding body of the first unit, and a rod-like member is passed through the hole and one end is attached to the second unit, thereby converting the opening/closing movement of the second unit into a reciprocating movement. An interlock switch is provided at the other end of the rod-shaped member, and the interlock switch is turned on and off in accordance with the opening and closing movement of the second unit.

[0011] As described above, in the present invention, since the interlock switch is made inaccessible from the rotating part, the switch is prevented from being operated accidentally or intentionally, and the above-mentioned object can be achieved. .

0012

EXAMPLES The present invention will be explained in detail with reference to Examples below. Outline of Structure of Laser Beam Printer FIG. 2 shows an outline of the laser beam printer used in this embodiment as an example of an information processing apparatus. Note that FIG. 2 shows this laser beam printer viewed from the side, and the left side of the figure is the front of the laser beam printer.

This laser beam printer 100 is equipped with a laser scanning device 101. Laser scanning device 101
A semiconductor laser (not shown) that modulates and outputs laser light according to an image signal is arranged. The laser beam emitted from this semiconductor laser is transmitted to a polygon mirror 102.
and is deflected according to this rotation. After passing through the fθ lens 103, the deflected laser beam passes through the mirror 1
The traveling direction is changed by 04 and 105, and the laser beam is outputted from this laser scanning device.

A photosensitive drum 106 is arranged on the extension of the laser beam output from the laser scanning device 101 and rotates at a constant speed in the direction of the arrow. Laser scanning device 10
The laser beam output from the photosensitive drum 1
A predetermined exposure position 107 of 06 is repeatedly scanned in its axial direction, that is, in the main scanning direction. A charge corotron 108 is arranged slightly in front of this exposure position 107 facing the photoreceptor drum 106, and the photoreceptor drum 1
The surface of 06 is uniformly charged. By irradiating the charged photosensitive drum 106 with a laser beam, an electrostatic latent image corresponding to image information is formed on the drum surface. This electrostatic latent image is developed by a developing device 109 on the drum surface downstream of the exposure position. Inside the developing device 109, there is a developing roll 110 for developing an electrostatic latent image by magnetically making the toner stand up, a toner supply mechanism 111 for supplying the toner in the cartridge to the developing roll 110, etc. parts are arranged. A predetermined developing bias is applied to the developing roll 110.

The toner image formed by the developing device 109 is moved to a position facing the transfer corotron 112 by the rotation of the photosensitive drum 106, where it is electrostatically transferred onto recording paper (plain paper). That will happen. Note that the charge corotron 1 used in this example
08 and transfer corotron 112, a single corotron wire is stretched in a space covered with a shielding member.
It has a structure in which a voltage application terminal is provided at one end.

Next, a brief explanation will be given of the conveyance path of the recording paper. Recording paper (not shown) is stored in a cassette tray 114 that is inserted from the front into a paper feeder 113 that is removably disposed at the bottom of the laser beam printer 100.
It is designed to be layered. Cassette tray 114
The recording paper placed in the uppermost layer is sent out of the tray 114 by a half-moon roll 115 having a half-moon shape. Note that other means such as a retard roll may be used instead of the half-moon roll 115.

The fed recording paper travels along a path indicated by a broken line by a transport roll 128, and is stably transported at a constant speed in synchronization with the rotational position of the photosensitive drum 106. In this way, the recording paper passes between the photosensitive drum 106 and the transfer corotron 112 at a desired timing. Only at this point in time,
The transfer corotron 112 discharges, thereby electrostatically attracting the toner image on the photosensitive drum 106 in the direction of the transfer corotron 112, thereby transferring the toner image onto the recording paper. The recording paper on which the transfer has been performed is charged from its back surface by a charge eliminating needle (not shown) disposed downstream of the transfer corotron 112, and is peeled off from the drum surface. After the peeled recording paper is conveyed along a conveyance path of a predetermined length to release the tension,
The toner is transported to a fixing device 118 consisting of a pair of heat roll 116 and pressure roll 117. In the fixing device 118, the recording paper is nipped by a heat roll 116 with a predetermined width.
and the pressure roll 117. At this time, the side of the recording paper onto which the toner image has been transferred becomes the heat roll 116 side, and the pressure roll 117 presses the recording paper against the heat roll 116 to enable efficient heat transfer. The heat roll 116 is controlled to a constant high temperature. In this state, the toner image on the recording paper is thermally fixed to the paper surface.

An exit roll 1 is provided on the exit side of the fixing device 118.
19 is prepared, and the recording paper conveyed to this exit roll 119 is discharged to the upper part of the laser beam printer 100. The recording paper is ejected through the above-mentioned path so that the recording surface is facing down, and the sheets can be printed one page at a time and then closed with a stapler in the order in which they were ejected.

On the other hand, the toner image that has not been transferred to the recording paper is removed from the drum surface by a cleaning device 120 located further downstream of the transfer corotron 112. The cleaning device 120 includes a blade 120b for scraping toner from the drum surface;
A film 120a is arranged to prevent toner leakage.

By the way, in the laser beam printer 100 of this embodiment, the photosensitive drum 106, the cleaning device 120, the charge corotron 108, and the developing device 10
9 are integrally constructed as an EP (Electric Printing) cartridge 121. Further, the laser beam printer 106 of this embodiment has a front cover 123 shown by a dotted line that opens and closes around a hinge 122. By opening the front cover 123, the user can remove paper jams and replace the EP cartridge 121 and transfer corotron 112 very easily. Furthermore, the laser beam printer 100 of this embodiment is configured so that the user can easily attach and detach the fixing device 118.

[0021] A power supply unit 124 consisting of a low voltage power supply and a high voltage power supply is arranged at the rear of the laser scanning device 101.
It supplies the necessary power to each component. Power supply section 124
A control device 125 is arranged behind the laser beam printer 100 and electrically controls the laser beam printer 100. An image information processing device 1 is provided above the power supply section 124 and the control device 125.
26 is arranged to translate image information sent from a computer or the like into the language of the laser beam printer 100 and send it to the control device 125.

As described above, in the laser beam printer 100 of this embodiment, so-called mechanical components are arranged at the front of the device, and so-called electrical components 127 are arranged at the rear. Interlock switch operating mechanism

FIG. 1 shows the main part of the interlock switch operation mechanism of this laser beam printer. As explained in FIG. 2, the front cover 123 is attached to the hinge 122.
It rotates around the center. The interlock mechanism of this embodiment is based on the hinge 1 of the front cover 123.
A link member 151 in the shape of an elongated rod with one end caulked is provided near 20. The link member 151 has a middle portion passing through a hole 153 formed in a part of the metal shield 152 surrounding the electrical component 127, and the other end of the link member 151 being a closed hole surrounded by the metal shield 152. protruding into the space.

In this space, the link member 151 in FIG.
Interlock switch 1 is located where the other end is located.
55 is fixed. That is, the actuator of the interlock switch 155 is in a depressed state with the front cover 123 closed.

FIG. 3 shows the location where the link member penetrates the metal shield. The link member has a rectangular cross section, and the hole 153 bored in the metal shield 152 is slightly larger than this. Therefore, although the link member 151 can easily move through the hole 153,
It is not possible to insert fingers or tools into the space where the electrical component 127 is housed through the gap between the electrical component 127 and the electrical component 127.

FIG. 4 shows a state in which the front cover of this laser beam printer is open. front cover 12
3 is opened, the link member 151 moves in the direction of the arrow 11, that is, in the front direction of the laser beam printer 100. The actuator of interlock switch 155, which is housed within metal shield 152, is thereby turned off. As a result, the power supply to the power circuit (not shown) is turned off, and the laser beam printer 100
electrical system becomes inoperable.

Of course, if the front cover 123 is closed after replacing the EP cartridge 121 or removing the jammed paper shown in FIG. 3, the link member 151 will move in the opposite direction again. Then, the interlock switch 155 is activated to return the device to a state where it can be operated.

In the laser beam printer of the embodiment described above, the front cover 123 and the link member 151 are connected in such a way that they cannot be separated, so the link member can be removed and the interlock switch 155 turned on and off as if the link member were simply fastened with a screw. It cannot be turned off, greatly increasing safety.

Although the present invention was applied to opening and closing the front cover in the embodiment, it is possible to apply the present invention to other cases as well, and the device may not operate due to the interlock switch being inadvertently operated. The inconvenience of this situation can be prevented.

[0030]

As described above, according to the present invention, since the first unit is covered with a shielding body, if this shielding body is made of a conductive material, the generation of noise can be suppressed and external noise can be suppressed. It can protect electrical components from

Furthermore, in the present invention, since a rod-like member is provided that reciprocates in accordance with the opening and closing of the second unit, by limiting the amount of movement of this rod-like member, it is possible to control not only the on/off of the interlock switch. This has the effect that it is also possible to limit the opening angle of the second unit.

[Brief explanation of the drawing]

FIG. 1 is a side view of the main parts of the laser beam printer of this embodiment, showing a state in which the front cover is closed.

FIG. 2 is a schematic configuration diagram showing the main parts of the laser beam printer of this embodiment.

FIG. 3 is a partial sectional view showing a location where the link member penetrates the metal shield.

FIG. 4 is a side view of the main parts of the laser beam printer of this embodiment, showing a state in which the front cover is open.

FIG. 5 is a side view showing the main parts of a conventional laser beam printer.

[Explanation of symbols]

110 Laser beam printer (information processing device) 12
3 Front cover 151 Link member 152 Metal shield 155 Interlock switch

Claims (1)

[Claims] Claim 1: A first unit that houses an electronic component, a shield that shields the first unit from the outside, a second unit that is arranged to be openable and closable with respect to the first unit, and a second unit that is arranged to be openable and closable with respect to the first unit. a rod-shaped member whose one end is attached to the second unit, whose middle portion passes through a hole drilled at a predetermined position in the shielding body, and which reciprocates in response to opening and closing of the second unit; An electronic device comprising: an interlock switch disposed on the other end side of the rod-shaped member and controlled to be turned on and off in response to opening/closing operations of the second unit.