JPH0350564A - Image forming device - Google Patents

Abstract

PURPOSE:To secure the safety of high-pressure output when opening a unit without preventing the miniaturized of a device by connecting and disconnecting the signal line of a high pressure output part in accordance with opening and closing of an upper unit and a lower unit by a connector means. CONSTITUTION:The device is constituted of the upper unit 1a and the lower unit 1b and has a clamshell structure where the upper unit 1a can freely open and close to the lower unit 1b. The signal line of the high pressure output part 30 is disposed over the unit 1a and the unit 1b. The signal line of the high pressure output part 30 is connected through the connector means 70 which can be attached and detached by opening and closing of the units 1a and 1b, so that the function of the high pressure output part 30 is automatically stopped in accordance with the opening of the clamshell. Thus, the safety of the high- pressure output at the time of opening the unit 1a and the unit 1b is secured without preventing the miniaturization of the device.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to an image forming apparatus such as an electronic copying machine in which, for example, an upper unit and a lower unit have a clamshell structure.

(Prior Art) Generally, an electronic copying machine is provided with a high voltage transformer as a high voltage output section, and this high voltage transformer receives on/off signal lines and control signals from a control PC (printed wiring) board. Various signal lines are connected, such as a power supply line and a ground line from a power supply PC board, a high-voltage output (bias) line to a developing device, and a high-voltage supply line to a transfer and stripping charger.

Generally, in an electronic copying machine, various signal lines of a high voltage transformer are connected using push button type switches. For this reason, as the number of signal lines increases, the number of switches also increases, resulting in an unnecessarily large amount of space.

Furthermore, in devices that use many push button type switches, it is very time consuming to connect or disconnect signal lines. Particularly, in a talum shell type copying machine in which an upper unit and a lower unit are configured to be openable and closable, when the clamshell is opened, the transfer and peeling chargers to which high voltage output is supplied are exposed. Therefore, it requires a great deal of effort to ensure safety against high-pressure output when the clamshell is opened.

(Problems to be Solved by the Invention) As mentioned above, in the conventional clam shell type electronic copying machine, a large amount of space is required for connecting the signal line of the high voltage transformer, and the high voltage output when the clam shell is opened. It required a great deal of effort to ensure safety.

Therefore, this invention provides the following advantages without compromising the miniaturization of the device:
It is an object of the present invention to provide an image forming apparatus that can easily ensure safety against high voltage output when the upper unit and lower unit are opened.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above object, in the image forming apparatus of the present invention, an upper unit and a lower unit are openable and closable, and the upper unit and a lower unit, in which the signal line of the high voltage output part is connected via a connector means that is connected and detached by opening and closing the upper and lower units. composition? has been done.

(Function) According to the present invention, the signal line of the high voltage output section is connected or disconnected by the connector means according to the opening and closing of the upper unit and the lower unit, so that the upper unit and the lower unit can be connected or disconnected. When opened, many signal lines can be disconnected at once in a small space, and the function of the high voltage output section is automatically stopped.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 5 schematically shows an image forming apparatus of the present invention, for example, a clamshell type electronic copying machine. That is, on the top surface of the copying machine main body 1, there is a document table (supporting the document).
Transparent glass) 2 is fixed. The document table 2 is provided with a fixed scale 21 that serves as a reference for setting the document, and furthermore, a document cover 12, which can be opened and closed, and a work table 12 are provided near the document table 2.

The original placed on the original table 2 is exposed and scanned by an optical system consisting of an exposure lamp 4, mirrors 5, and 6.7 being reciprocated in the direction of arrow a along the lower surface of the original table 2. It is now possible to do so.

In this case, mirrors 6 and 7 are moved at half the speed of mirror 5 so as to maintain the optical path length. The light reflected from the original by the scanning of the optical system, that is, the light reflected from the original by the light irradiation of the exposure lamp 4, is reflected by the mirrors 5, 6.7, passes through the variable magnification lens block 8, and then passes through the mirror. 9 and guided to the photoreceptor drum 10, an image of the document is formed on the surface of the photoreceptor drum 10.

The photosensitive drum 10 is rotated in the direction of arrow C in the figure in synchronization with the optical system, and first, the surface thereof is charged by the charging device 11. Thereafter, the image is subjected to slit exposure at the exposure section ph, thereby forming an electrostatic latent image on its surface. This static electricity? The a image is made visible by applying toner by the developing device 12.

On the other hand, the paper P is selectively taken out one by one from the paper feed cassette 13.13 by the delivery roller 15 or 16, and the taken out paper P passes through the paper guide path 17 or 18 and passes through the registration roller pair The paper is guided to one of the pair of registration rollers, and is fed to the transfer section by one pair of registration rollers.

Here, the paper feed cassette 13.13 is connected to the copying machine main body 1.
They are removably attached to each other, and one can be selected from an operation panel (not shown). Further, the paper feed cassettes 13, 13 are configured such that the size of the paper P stored therein is detected by paper size detection switches 601, 602, respectively.

The paper P sent to the transfer section is brought into close contact with the surface of the photoreceptor drum 10 at the transfer charger 20, and
The toner image on the photoreceptor drum 10 is transferred by the action of 0. The transferred paper P is electrostatically peeled off from the photoreceptor drum 10 by the action of a peeling charger 21, and is sent by a conveyor belt 22 to a pair of fixing rollers 23 as a fixing device provided at the end of the conveyor belt 22. . The transferred image is inspected by passing through this, and the paper P after fixing is sent to the paper ejection port.
The paper is discharged to a tray 25 outside the main body 1 by the roller pair 24.

Further, the photoreceptor drum 10 after the transfer is transferred to a charger 26 for removing static electricity.
After the charge is removed by the cleaner 27, the remaining toner on the surface is removed, and the afterimage is erased by the charge removal lamp 28, so that the initial state is restored. Note that 29 is a cooling fan for preventing the temperature inside the main body 1 from rising.

By the way, the copying machine main body 1 described above has an upper unit 1a.
and a lower unit 1b, and has a clam shell structure in which the upper unit 1a can be opened and closed in the direction of arrow A in the figure with respect to the lower unit 1b around a rotation axis (not shown). In this case, for example, the above-mentioned optical system (exposure lamp 4, mirrors 5, 6, 7), photosensitive drum 10, charging device 1,
1, the developing device 12, the charger 26 for neutralizing electricity, the cleaner 27, the neutralizing lamp 28, the cooling fan 29, and the like are all arranged in the upper unit 1a. Further, for example, the above-mentioned transfer charger 20, peeling charger 21, conveyance belt 22, etc. are all arranged in the lower unit 1b. Therefore, when the upper unit 1a is pulled up in the direction of arrow A, the clamshell is opened, thereby exposing the inside of the main body 1 across the transfer section.

FIGS. 1 and 2 show an example of the wiring of signal lines related to high-voltage output in a copying machine configured as described above.

A high-voltage transformer 30 serving as a high-voltage output section is disposed, for example, in the same lower unit 1b as the transfer charger 20 and the peeling charger 21.

In addition, a power supply PC (printed wiring) board 40 and a control PC
The plate 50 is provided, for example, in the same upper unit 1a as the developing device 12.

The high voltage transformer 30 is connected to signal lines (high voltage cables) for supplying high voltage to the transfer charger 20 and the peeling charger 21.

The high-voltage transformer 30 also includes signal lines for power and ground from a power PC (printed wiring) board 40, and signals for on/off (operation) signals and control signals from a control PC board 50. line, and a signal line for bias supply (high voltage output) to the developing device 12 are connected via connector means 70 by 7\-nes.

The connector means 70 consists of an upper connector (supply side connector part) 70a attached to the upper unit 1a and a lower connector 70b fixed to the lower unit 1b, and is used to open and close the upper unit 1a and the lower unit 1b. It is said to be a drawer type that can be attached and detached depending on the situation. Therefore, by connecting and disconnecting the upper connector 70a and the lower connector 70b of the connector means 70 in accordance with opening and closing of the upper unit 1a and the lower unit 1b, various signal lines to the high voltage transformer 30 can be connected at once in a small space. It is possible to connect or disconnect.

FIG. 3 schematically shows how the upper connector 70a is attached to the upper unit 1a.

This upper connector 70a is, for example, an upper unit 1a.
It is attached to the frame 1-a with a gap α of about several mm. That is, as shown in FIG. 4(a), the screw 72 is installed using a screw 72 whose unthreaded portion is longer by α mm than the thickness L of the screw fixing portion 71 of the upper connector 70a. There is. As a result, the upper connector 70a can move with a width of αmm, so the upper unit 1a and the lower unit 1b
This ensures a margin for play (backlash) during blockage.

In this way, the upper connector 70b is fixed to the lower unit 1b, while the upper connector 70b is fixed to the upper unit 1a.
By movably attaching 0a, it is possible to easily attach and detach the connector means 7o when opening and closing the upper unit 1a and the lower unit 1b.

Further, the connector means 7o is provided near the end on the opening/closing side opposite to the shaft side when the upper unit 1a and the lower unit 1b are opened/closed. This makes it possible to reliably attach and detach the upper unit 1a even if the amount of movement of the upper unit 1a is small, that is, the upper unit 1a has a small linear movement.

Furthermore, since the upper connector 70a is on the power supply side, it has a structure that prevents danger from high voltage output even if a finger or the like is inserted into it. That is, FIG. 4(a). As shown in (b), a guide member 73 for attachment and detachment is provided inside the upper connector 70a, and the harness is connected to this guide member 73 with a gap of 4 mm or more from its tip. A contact 74 is attached. Thereby, even if a finger or the like is inserted into the inside of the upper connector 70a when the clamshell is opened, direct contact with the contact point 74 is prevented. Therefore, it is said to be highly safe against high voltage output.

In the above-described configuration, suppose that the upper unit 1a is opened in the direction of arrow A in the figure with respect to the lower unit 1b due to, for example, a paper jam (paper jam).

Then, the taram shell is opened accordingly, and the inside of the copying machine main body 1 is exposed across the transfer section. As a result, the transfer charger 20, the peeling charger 21, and the like are exposed.

On the other hand, in response to the opening of the talum shell, the upper connector 70a and the lower connector 70b of the connector means 70 are separated. Then, all connections of the signal lines to the high voltage transformer 30 are cut off at once. As a result, the function of the high voltage transformer 3o is automatically stopped. Therefore, the supply of high voltage output to the transfer charger 20, the peeling charger 21, etc. is blocked. Therefore, even if the user accidentally touches the exposed transfer charger 2o, peeling charger 21, etc. when removing the jammed paper P, there will be no risk of electric shock or burns.

As described above, when the clamshell is opened, the signal line to the high voltage transformer is disconnected accordingly.

That is, when the upper unit and the lower unit are opened, the upper connector and the lower connector of the connector means are disconnected accordingly, and all connections of the signal lines to the high voltage transformer are cut off at once. ing. As a result, the function of the high voltage transformer is automatically stopped when the clamshell is opened. Therefore, even in a state where the transfer charger, the peeling charger, etc. are exposed by opening the clam shell, safety against high voltage output can be ensured.

Moreover, in this case, multiple signal lines can be connected and disconnected at once using the drawer type connector means, so it can be easily realized with a simple configuration and in less space than a push button type switch. It is something.

Also, when the clam shell is open,
Power is supplied to the upper connector from a power supply PC board. However, since the guide member prevents contact with the contacts, it is safe even if a finger or the like is inserted into the upper connector.

Furthermore, by making one of the connector means fixed and the other semi-fixed, the upper connector and the lower connector can be easily attached and detached.

Further, since the connector means is disposed near the open end, the upper connector and the lower connector can be reliably attached and detached.

In the above embodiment, the upper connector is semi-fixed and the lower connector is fixed, but the present invention is not limited to this. For example, the upper connector may be fixed and the lower connector is semi-fixed. good.

It is also possible to combine several signal lines or to connect each signal line via a connector means.

It goes without saying that various other modifications can be made without departing from the gist of the invention.

[Effects of the Invention] As detailed above, according to the present invention, the function of the high voltage output section can be stopped automatically in response to the opening of the clam shell, using the connector means and in a small space. Accordingly, it is possible to provide an image forming apparatus that can easily ensure safety against high voltage output when the upper unit and lower unit are opened, without compromising miniaturization of the apparatus.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention. Fig. 1 is a perspective view of an electronic copying machine showing an example of wiring of a high voltage transformer according to the invention, Fig. M2 is a block diagram of the same, and Fig. 3 is a diagram of an upper connector. FIG. 4 is a diagram showing an example of the structure of the upper connector, and FIG. 5 is a side sectional view schematically showing the structure of the electronic copying machine. 1... Copying machine main body, 1a... Upper unit, 1b.
... Lower unit, 12... Developing device, 20... Charger for transfer, 21... Charger for peeling, 30... High voltage transformer, 40... PC board for power supply, 50...・Control P
C plate, 70... Connector means, 70a... Upper connector, 70b... Lower connector, 73... Guide member, 74... Contact.

Claims (5)

[Claims] (1) In an image forming apparatus in which an upper unit and a lower unit are openable and closable, and a signal line of a high-voltage output section is disposed across the upper and lower units, the signal line of the high-voltage output section is An image forming apparatus characterized in that the upper unit and the lower unit are connected to each other via a connector means that can be attached and detached by opening and closing the upper unit and the lower unit. (2) The image forming apparatus according to claim 1, wherein the connector means is of a drawer type. (3) The image forming apparatus according to claim 1 or 2, wherein the connector means has one connector portion fixed and the other connector portion semi-fixed. (4) Claim (1), (2) or (3) characterized in that the connector means is provided near an end opposite to the shaft side when the upper unit and the lower unit are opened and closed. )
The image forming apparatus described above. (5) Among the signal lines of the high voltage output section, the supply side connector section of the connector means to which signal lines such as power supply, operation signals, and control signals are connected has a guide member for attachment and detachment, and this guide member 4. The image forming apparatus according to claim 1, wherein the contact point of the signal line is configured with a gap of 4 mm or more from the tip of the signal line.