JPH085497Y2 - Image forming device - Google Patents

Description

TECHNICAL FIELD The present invention relates to an image forming apparatus using an electrophotographic process such as a laser printer, a copying machine, and a facsimile, and more particularly to an arrangement structure of a high voltage power source section thereof.

2. Description of the Related Art Conventionally, in a laser printer, for example, a charging mechanism and a charge eliminating mechanism around a photoconductor, a high-voltage power supply for applying a high voltage to the charging mechanism, and a control board for controlling the high-voltage power supply are generally arranged separately from each other. It had been.

Therefore, there are many disadvantages in reducing the size of the image forming apparatus.

The present invention aims to reduce the size of the image forming apparatus, reduce the number of parts,
The purpose is to improve the reliability of high voltage application.

Means for Solving the Problems For example, as shown in the following illustrated embodiments, a photosensitive member 11, a process such as a charger 12 for charging the photosensitive member 11, and a process means for forming a latent image on the photosensitive member 11. And a process means such as a developing device 14 for forming a latent image of the latent image with toner, and a transfer device for transferring the toner image to a sheet.
In an image forming apparatus such as a laser printer having a process means such as 20, an apparatus body such as a printer body 10 is composed of an upper unit 10a and a lower unit 10b, and the lower unit 10b is connected to the upper unit 10a. The lower unit 10b is provided with a control board, and a high-voltage power supply unit 21 is provided on the control board 22 via connectors 23 and 24, and the high-voltage power supply unit 21 has an upward contact. Part 25/26/27
And at least one of the four process means
One of the contact points 25a, 26a, 27a of the process means is pressurized by interlocking with the closing operation of the upper unit 10a.
Is directly joined to the contact points 25, 26, 27 of the high-voltage power supply unit 21.

According to the present invention, the harness is eliminated between the control board, the high voltage power supply unit and the means to which a high voltage is applied.

Embodiment Next, an embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a conceptual diagram of a laser printer according to the present invention. The printer body 10 is separated into an upper unit 10a and a lower unit 10b, and the upper unit 10a is screwed to the lower unit 10b so as to be vertically openable and closable as shown in FIG. The upper unit 10a is provided with a photoconductor 11, a charging device 12, a developing device 14 having a replaceable toner cartridge 13, and a cleaning unit 15, which constitute an image forming unit 16 as shown in FIG. The upper unit 10a is further provided with a paper feed roller 17, an upper roller 18a of the pair of registration rollers 18a and 18b, and a pressure roller 19a of the fixing device 19. On the other hand, the lower unit 10b includes a transfer device 20, a lower roller 18b of the pair of registration rollers 18a and 18b, and a fixing device 19.
The fixing roller 19b, the high voltage power supply unit 21, and the control board 22 are provided. 17a is a paper feed tray.

The high-voltage power supply unit 21 has a connector 23 on the bottom surface of the third
Connector provided on the top surface of the control board 22 as shown in the figure
It is directly attached to the control board 22 and is detachably installed on the control board 22. To facilitate the attachment / detachment, the attachment / detachment direction is the same vertical direction as the opening / closing direction of the upper unit 10a, and the installation position is opposite to the screwing side of the upper unit 10a. On the upper surface of the high-voltage power supply unit 21, the contact portion 2 for the transfer device is provided at the center.
5. A raised developing device contact portion 26 and a cleaning unit contact portion 27 are provided on both sides thereof.

Transfer device corresponding to these contact points 25, 26, 27 respectively
Contact points 25a, 26a, and 27a are provided at one end of each of 20, the developing device 14, and the cleaning unit 15. Transfer device 2
When 0 is attached to the lower unit 10b, its contact portion 25a is directly joined to the central contact portion 25 of the high-voltage power supply unit 21 for the transfer device in the vertical direction, and a high voltage is applied from the high-voltage power supply unit 21. When the developing device 14 and the cleaning unit 15 close the upper unit 10a, their contact portions 26a and 27a are directly joined to the developing device contact portion 26 and the cleaning unit contact portion 27 of the high-voltage power supply unit 21 in the vertical direction, A high voltage is applied from the high-voltage power supply unit 21 (also to the charger 12).

The high-voltage power supply unit 21 is fixed to the lower unit 10b by, for example, mounting projections 21a on both sides thereof as shown in FIG.
Is fixed to the frame 28 of the lower unit 10b with screws 29. Alternatively, as shown in FIG. 5, the lower unit 10b
The frame 28 is provided with a leaf spring 30, and the protrusion 21b of the high-voltage power supply unit 21 is snap-engaged with the leaf spring 30 to be fixed.

The high-voltage power supply unit 21 can be further provided with a contact portion for a paper separation charger.

Since the high-voltage power supply unit 21 is pressurized from the upper side by the objects to which the high-voltage is applied as described above, according to the number of objects (the number of high-voltage outputs) of the objects so that the pressing force becomes even, as shown in FIG. As shown in Fig. 7, the intervals of the contact points 25, 26, 27 are distributed. FIG. 8 is a block diagram when the number of high voltage outputs is one (one circuit), and FIG. 9 is a block diagram when two high voltage outputs (two circuits).

According to the present invention, the harness is eliminated between the control board, the high-voltage power supply unit, and the means to which a high voltage is applied. Therefore, the image forming apparatus can be downsized, the number of parts can be reduced, and the reliability of high voltage application can be improved. It is possible to improve the sex. Further, since a low-voltage signal line can be supplied to the high-voltage power supply unit via the connector and a high-voltage can be directly output from the high-voltage power supply unit, the high voltage and the low voltage can be easily separated.

Further, according to the present invention, a high-voltage power supply unit and process means to which high voltage is applied are sequentially stacked on the control board of the lower unit, and they are directly connected to each other without using a connector or a pressure connection. Easy connection and disconnection makes it easy to connect, so by opening the upper unit, various process means and high-voltage power supply units can be easily removed and installed.
Maintenance can be simplified. Moreover, when the upper unit is closed, pressure is applied to join the contact portions to each other, so that the reliability of the electrical connection is not impaired even if the contact and separation are easy.

[Brief description of drawings]

FIG. 1 is a conceptual view of a laser printer according to the present invention, FIG. 2 is a perspective view thereof, FIG. 3 is an exploded perspective view of a high-voltage power supply unit, and FIG.
FIG. 5 and FIG. 5 are cross-sectional views of a fixed example of a high-voltage power supply unit, respectively, and FIGS. 6 and 7 are explanatory views for allocating contact portions for equalizing pressure applied to the high-voltage power supply unit.
FIG. And FIG. 9 are block diagrams. 11 …… Photosensitive member 12 …… Charger 14 …… Developer 15 …… Cleaning unit 20 …… Transfer 21 …… High voltage power supply unit 22 …… Control board 23 ・ 24 …… Connector 25 ・ 26 ・ 27 …… High voltage Power supply unit contacts 25a, 26a, 27a ... Contacts of transfer unit, developing unit and cleaning unit

Claims (1)

[Scope of utility model registration request] 1. A photoconductor, process means for charging the photoconductor, process means for forming a latent image on the photoconductor, process means for developing the latent image with toner, and process means for transferring the toner image to a sheet. In the image forming apparatus having, an apparatus main body is composed of an upper unit and a lower unit, and the upper unit can be opened and closed vertically with respect to the lower unit, while the lower unit is provided with a control board, A high-voltage power supply unit is provided on the control board via a connector, and the high-voltage power supply unit is provided with an upward contact portion.
An image forming apparatus in which at least one of the two process means is pressed in conjunction with the closing operation of the upper unit to directly join the contact portion of the process means to the contact portion of the high-voltage power supply unit. .