JPH04134355A - Image forming device - Google Patents

Abstract

PURPOSE:To improve the assembling property of a signal system and a power source system when a power source device is set in an image forming device main body by providing a control signal conductor which drives a polygon motor in the power source device and providing a connector which connects the control signal conductor and the polygon motor. CONSTITUTION:The power source device 12 is constituted as a unit which can be loaded and unloaded with respect to the lower structure body of a printer main body and connected to an engine control substrate 43 through the connector CN1. Besides, it is connected to the polygon motor 28 through the connector CN7. Then, a reference clock for controlling a polygon motor SMCK and a control signal for turning on or off a polygon motor SMST from the substrate 43 are supplied to the motor 28 through the power source device 12. Thus, since the polygon motor 28 and the power source device 12 are automatically and electrically connected, the assembling property is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electrophotographic image forming apparatus such as a laser printer or a laser copying machine having a laser optical system.

In conventional image forming apparatuses of this type, signals and power for controlling the polygon motor of the laser optical system were supplied from the engine board via a harness connecting the engine board and the laser optical system. Assembly was complicated.

An object of the present invention is to eliminate such problems and improve the assemblability of the signal system and power supply system that control the polygon motor.

For this reason, the present invention provides an image forming apparatus that includes a power supply device in which a high voltage power source for an electrophotographic process and a low voltage power source for engine control are housed in the same unit, and a laser optical system including a polygon motor. In the power supply device,
A control signal line for driving the polygon motor is provided, and when the power supply device is set in the image forming apparatus main body, the control signal line and the polygon motor are connected to the power supply device and the laser optical system. It is equipped with a connector for connecting.

Operation: Therefore, when the power supply device is set in the image forming apparatus, the polygon motor is automatically electrically connected to the power supply device.

Loss - Goichitoyo Next, one embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a general configuration diagram of the entire laser printer according to the present invention. In FIG.
The earthen structure 10a can be opened and closed from the lower structure 10b using a shaft 11 as a fulcrum.

The lower structure 10b includes a power supply device 12, which is the gist of the present invention.
, photoreceptor 13° developing unit 14, charger 15
, cleaning unit 16, laser optical unit 17
etc. are provided. The soil structure 10a also includes a paper feed roller 18. Registration roller pair 19, transfer charger 2
0, a fixing unit 21, etc. are provided.

The paper in the paper feed cassette 22 loaded on the soil structure 10a is fed by the paper feed roller 18, and is conveyed to the upper side of the photoreceptor 13 by a pair of registration rollers 19 at a timing. The photoreceptor 13 is rotated counterclockwise, and at this time, the surface is charged by the charger 15.
An electrostatic latent image is formed on the photoreceptor 13 by being irradiated with laser light from the laser optical system 17 . This latent image is made visible by toner when it passes through the developing unit 14, and this visible image is transferred by the transfer charger 20 to the lower surface of the paper conveyed onto the photoreceptor 13.

The paper is conveyed between the fixing roller 21a and the pressure roller 21b of the fixing unit 21, and the visible image is fixed on the paper. Then, the paper that has exited the fixing unit 21 is transferred to the paper ejection roller 2.
3 to the paper discharge section, guided by the paper discharge guide 24 and stacked on the paper discharge tray 25. On the other hand, the cleaning unit 16 removes residual toner from the photoreceptor 13 after the visible image has been transferred.

The laser optical system 17 includes a polygon mirror 27 inside a heat insulating base cover 26 and a polygon motor 2 that rotates the polygon mirror 27.
8. A cylinder lens 3 that houses an fθ lens 29, a second mirror 30, etc., and is attached to the developing unit 14.
Laser light is irradiated onto the photoreceptor 13 through the photoreceptor 1 .

The power supply device 12 is a unit that can be attached to and detached from the lower structure 10b, and when set inside the lower structure 10b, the high voltage output connector 32 on the power supply 12 side is connected to the printer main body 10.
The high voltage input connector 33 on the side is automatically engaged and electrically connected.

FIG. 2 is a block diagram showing the internal configuration of the power supply device 12. As shown in FIG. This power supply device 12 is roughly divided into an AC input section 34.
, low voltage power supply section 35 , heater control section 36 , and high voltage power supply section 37
It consists of

The AC input section 34 includes an AC inlet 38, a main switch 39, and a noise filter 40, and supplies AC input to the constant voltage circuit 41 of the low voltage power supply section 35 and the heater control section 36.

The low voltage power supply unit 35 receives AC input and connects constant voltage circuits 41 to 3.
DC low voltage in stages, i.e. +5V, +12V, +24
Generates a DC voltage of V. +5v and 112cm are immediately output from connector CNI. +24V is supplied to the connectors CNI and CN6 and the high voltage power supply section 37 via the interlock switch 42. The +5v output from the connector CNI is supplied to an engine control board (main body control circuit) 43, which will be described later, and the +24v is supplied as a power source for driving the main drive motor, solenoid, and laser diode. +24V output from connector CN6 is supplied as power for driving the fan motor. +12V output from connector CN7 is supplied as a power source for driving the polygon motor 28.

The heater control unit 36 is for controlling on/off of the fixing heater, and is configured by an SSR circuit 44, receives a HEAT signal from the engine control board 43, and supplies AC voltage to the heater from the connector CN2.

The high voltage power supply section 37 is a charging power supply (C power supply) 37G.

Consisting of three types of power supplies: a transfer power supply (T power supply) 37T and a developing bias power supply (B power supply) 37B, +24V from the constant voltage circuit 41 is input, and the high voltage output terminals CN3 and CN3 of the high voltage output connector 32 corresponding to each are input. Outputs high voltage from CN5 and CN4.

These three types of power supplies 37C, 37T, and 37B are connected to the engine control board 43 via the connector CN1.
TCGR and BIAS signals are inputted to control the on/off of charging, transfer, and development bias outputs, respectively. Furthermore, the output values of these power supplies 37C, 37T, and 37B can be adjusted individually by variable resistors 45C, 45T, and 45B. The charging power source 37C and the transfer power source 37T are constant current outputs, for example, -150u each.
A (-5KV~8KV), +100μA (+4K
V~7KV). The developing bias power supply 37B is a constant voltage output, and outputs, for example, -450V to -900V. Further, an image density adjusting variable resistor 46 on the printer main body 10 side is connected to the developing bias power supply 37B via a connector CNI.

3(A) and 3(B) show a high voltage connection between the power supply device 12 and the printer main body 10 side. When the power supply device 12 is slid in the direction of the arrow along the guide rib 47 provided on the printer main body 1o side, the three high voltage output terminals CN3 and CN5 of the high voltage output connector 32 on the power supply device 12 side
・CN4 is the base frame 48 inside the printer main body 10
The high voltage input terminals 33C, 33B, and 33T corresponding to the high voltage input connectors 33 provided in the
Each is electrically connected. In this case, the charging output is -5K
V ~ 8KV, transcription output is +4KV ~ 7KV.

Since the developing bias output is from -450 V to -900 V, charging and transfer terminals are arranged on both sides of the developing bias terminal in order to make the insulation interval as short as possible. In addition, each high voltage output terminal CN3, CN5,
CN4 is covered with insulation protection rib 32a and connected to high voltage input terminal 33.
Insulating ribs 48a are provided between C, 33B, and 33T.

48b is a stopper. In addition, high voltage output terminal CN3
CN5/CN4 and high voltage input terminals 33C, 33B, 33
It is preferable that T be configured like a leaf spring to have spring properties.

FIG. 4 shows the high voltage input terminal 3 on the printer main body 10 side.
An example of electrical wiring from 3C, 33B, and 33T to charging, developing bias, and transfer power supply points is shown. High voltage cable 4 to each high voltage input terminal 33C, 33B, 33T
Charging, developing bias, and transfer supply terminals 50 via 9
Connect C, 50B, and 50T by wiring. High voltage input terminal 33
C, 33B, and 33T have spring properties by bending the tip of the metal piece into a U-shape. In addition, high voltage input terminal 33C・3
It is also possible to configure the space from 3B-33T to the supply terminals 50C-50B-50T with an integrally molded metal plate, and fix this to the resin-molded base frame 48 by insert molding or by a simple fitting method.

Further, as shown in FIG. 5, the high voltage output terminals CN3, CN5, and CN4 on the side of the power supply bag N12 are made into a simple flat plate shape without spring properties, and are provided within the box-shaped insulation protection ribs 51, respectively.
On the other hand, if the tips of the high-voltage input terminals 33C, 33B, and 33T are bent into a U-shape to have a highly springy structure, these can be reliably connected.

FIG. 6 shows an example of the outer structure of the power supply device 12, with the case 52
On the front side, there is an AC inlet 38 and a main switch 39,
High voltage output connector 32° on the top surface, connector C on the left end surface
NI and interlock switch 42 are arranged, and the above-mentioned connector C for the heater is provided on the right end surface, although not shown.
N2 is installed. The interlock switch 42 is turned on by being pushed in the direction of the arrow by the actuator on the printer body 10 side when the soil structure 10a of the printer body 10 or the cover is closed, and is turned on by +24V as described above.
supply.

FIG. 7 is a block diagram showing the connection relationship between the power supply device 12, the engine control board 43, and the polygon motor 28.

The power supply device 12 and the engine control board 43 are connected to the connector CN.
The power supply device 12 and the polygon motor 28 are connected via a connector CN7. The polygon motor control reference clock SMCK and the polygon motor on/off control signal 5M5T from the engine control board 43 are supplied to the polygon motor 28 via the power supply device 12.

FIG. 8 shows the arrangement relationship among the power supply device 12, the engine control board 43, and the laser optical system 17. A plate spring type connector 53 electrically connected to the polygon motor 28 is provided on the base cover 26 that houses the laser optical system 17. When the power supply device 12 is placed on the base cover 26, the connector 53 is connected electrically to the polygon motor 28. 53 and connector CN7 on the power supply 12 side
will be automatically connected. The engine control board 43 is arranged on the side of the base cover 26. Power supply device 12
The side connector CNI is pulled out by a lead wire 54 and connected to a connector 55 on the engine control board 43 side.

FIG. 9 specifically shows an example of the plate spring type connector 53, in which a plurality of plate spring-shaped terminals 56 are separated by insulating ribs 57 and arranged in parallel on the base cover 26.

FIG. 10 is a bottom view of the laser optical system 17, in which 58 is a laser diode unit, and 59 is a synchronous zero period detection unit.

According to the present invention, when the power supply device is set in the image forming apparatus, the polygon motor and the power supply device are automatically electrically connected, so that ease of assembly is improved.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram of a laser printer which is an example of an image forming apparatus according to the present invention, FIG. 2 is a block diagram of the internal configuration of its power supply device, and FIG. 3 (A) and (B) are diagrams showing the power supply device and the printer. Top view and side view of the high-voltage connection part with the main body side, No. 4
The figure is a perspective view of an example of electrical wiring from the high-voltage input terminal to the charging, developing bias, and transfer power supply points on the printer body side, and Figure 5 shows the high-voltage output terminal on the power supply side and the high-voltage input on the printer body side. FIG. 6 is a perspective view of an example of the outer structure of the power supply device; FIG. 7 is a block diagram showing the connection relationship between the power supply device, engine control board, board, and polygon motor; FIG. 8 is a perspective view of a specific example of the terminal; The figure is a perspective view showing the arrangement relationship between the power supply device, the engine control board, and the laser optical system, and FIG. 9 is a perspective view of an example of a plate spring type connector on the laser optical system side.
FIG. 1d is a perspective view of the laser optical system seen from below. 1o...Printer body, 12...
...Power supply device, 17...Laser optical system, 28...Polygon motor, CN7.
53・・・・・・・・・Connector. Figure 3 (A)

Claims (1)

[Claims] In an image forming apparatus having a power supply device in which a high voltage power supply for an electrophotographic process and a low voltage power supply for engine control are housed in the same unit, and a laser optical system including a polygon motor, the polygon motor is installed in the power supply device. a connector having a control signal line for driving the polygon motor and connecting the control signal line to the polygon motor when the power supply device is set in the image forming apparatus main body; An image forming apparatus characterized by being provided with.