JPH02197857A - Image forming device - Google Patents

Abstract

PURPOSE:To detect abnormal lighting and to restrain wasteful power consumption by providing a means which stops power supply if the heating of an emitter is detected when a control means driving and controlling a supply means supplying power to an emitter does not actuate. CONSTITUTION:When a lamp 4 is lit by noise from an AC power source 101 on any occasions except the normal lighting of the halogen lamp 4, a current detecting element 102 detects a current flowing into the lamp 4. In a main processor group 71 to which an output from the current detecting element 102 is supplied, when the current flowing into the lamp 4 from the current detecting element 102 of a lamp control part 81 is detected although an operating signal is not supplied to the lamp driving circuit 100 of the lamp control part 81 that is judged to be the abnormal lighting of the lamp 4 to output stopping signals actuating brakers 103a and 103b.

Description

Detailed Description of the Invention [Objective of the Invention] (Industrial Application Field) The present invention relates to an exposure lamp for scanning a document or a heater lamp for fixing a toner image, such as in an electronic copying machine. The present invention relates to an image forming apparatus having the following.

(Prior Art) A conventional electronic copying machine is provided with a temperature fuse in order to protect the machine body from adverse effects caused by abnormal lighting of an exposure lamp (light source), for example.

This temperature fuse is designed to automatically break when the ambient temperature of the fuse reaches a certain value (for example, 250° C.) or higher.

However, for example, if the exposure lamp malfunctions (is abnormally lit) due to noise from an AC power supply or the like at a time other than when it should be driven, the abnormal lighting of the exposure lamp will remain in a state until the temperature fuse is blown. For this reason,
Until the temperature fuse blows, power may be wasted or the machine may suffer some damage (for example, the glass on the document table may break or the document cover may burn).

Similarly, a heater lamp (light emitter) is used to fix the toner image.
If the heater lamp malfunctions when it is not supposed to be driven due to noise from the AC power supply,
The abnormal lighting of the heater lamp remained until the temperature fuse was blown, resulting in unnecessary power consumption and some damage to the aircraft.

(Problems to be Solved by the Invention) As mentioned above, in the conventional device, until the temperature fuse used to maintain the aircraft is blown, there is a needless consumption of power, and there is a possibility that the aircraft may It had the disadvantage of being damaged.

Therefore, the present invention provides an image forming apparatus that can prevent wasteful consumption of power and adverse effects on the machine body, and further improve safety. The aim is 1°.

[Configuration of the Invention (Means for Solving the Problems) The image forming apparatus of the present invention includes a light source for exposing an original, a power source for lighting this light source, and power from this power source to the light source. a supply means for supplying; a control means for driving and controlling the supply means; a detection means for detecting lighting of the light source when the control means is not driving the supply means; and stop means for blocking the supply of power by the supply means when lighting is detected.

In addition, in an image forming apparatus having a fixing device that fixes a developer image on a transfer material using heat generated by a light emitting body, a power source for generating heat in the light emitting body of the fixing device, and a power source for supplying power from the power source to the light emitting body are used. a control means for driving and controlling the supply means; a detection means for detecting heat generation of the light emitting body when the control means is not driving the supply means; and a stop means for blocking the supply of power by the supply means when heat generation of the body is detected.

Further, the image forming apparatus is configured to include a display means for displaying that the supply of power by the supply means is blocked by the stop means.

(Function) The present invention uses the above-described means to immediately stop abnormal lighting of the light source or the light emitting body other than when it should be driven.

If the light source or light emitter lights up abnormally,
This will be reported to the operator.

(Example) An embodiment of the present invention will be described below with reference to the drawings.

FIGS. 2 and 3 schematically show an image forming apparatus of the present invention, such as an electronic copying machine. That is, on the top surface of the copying machine main body 1, there is a document table (transparent glass) that supports the document.
2 is fixed. The document table 2 is provided with a fixed scale 2 that serves as a reference for setting the document, and furthermore, a document cover 11 and a work table 12, which can be opened and closed, are provided near the document table 2. Then, the document table 21
; An optical system (scanner) consisting of a halogen lamp (light source) 4 as an exposure lamp and a mirror 5, 6, 7 moves back and forth along the lower surface of the document table 2 in the direction of arrow a. Exposure scanning is performed by In this case, mirror 6.7 is 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 halogen 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, so that 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, and the surface thereof is first charged by the charging device 11 . Thereafter, the image is exposed to slit light to form an electrostatic latent image on the surface. This electrostatic latent image is visualized as a toner image by applying toner by the developing device 12.

On the other hand, the paper (transferring material) P is taken out one by one from the selected upper paper feed cassette 13 or lower paper feed cassette 14 by the delivery roller 15 or 16. The taken out paper is guided to a pair of registration rollers 19 through a paper guide path 17 or 18, and is sent to a transfer section by this pair of registration rollers 19 in synchronization with the toner image formed on the photoreceptor drum 10. It is now possible to

Here, the paper feed cassettes 13 and 14 are removably provided at the lower right end of the main body 1, and one of them can be selected from an operation panel to be described later. Note that each of the above paper feed force sensors 1, 3 and 14 is a cassette size detection switch 60. ．． The cassette size is detected by 60□. This cassette size detection switch 60. ．． 602 is composed of a plurality of microswitches that are turned on/off in accordance with the insertion of cassettes of different sizes.

The paper P sent to the transfer section is tightly packed with the surface of the photoreceptor drum 10 at the transfer charger 20, and
The toner image on the photoreceptor drum LO 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 fixed by passing through this, and the fixed paper P is discharged to a tray 25 outside the main body 1 by a pair of paper discharge rollers 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, residual 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 rotatably supported in order to prevent a rise in temperature within the main body 1.

FIG. 4 shows an operation panel 3o provided on the main body 1. 30a is a copy key for commanding the start of copying; 30b
30c is a display section that displays the operating status of each part, paper jams, and abnormal lighting of the halogen lamp 4 and the halogen lamp (light emitter) as a heater lamp, which will be described later. , 30d is a cassette selection key for selecting the upper and lower paper feed cassettes 13 and 14. 30e is a cassette display section for displaying the selected cassette IN, and 30f is a magnification setting key for setting copy enlargement and reduction magnification in a predetermined relationship. 30g is a zoom key for steplessly setting the enlargement/reduction magnification; 3o1 is a magnification display section for displaying the set magnification; and 30i is a density setting section for setting the copy density.

FIG. 5 shows the overall control circuit.

The main processor group (control means) 71 is connected to the operation panel 3
0 and various switches and sensors, such as the cassette size detection switch 601. ．． Input device 7 such as 602
5, the various chargers 11. ．． 20.
21, the high voltage transformer 76 that drives the static elimination lamp 28
, the blade solenoid 27a of the cleaner 27, the halogen lamp (light emitter) 23a as a heater lamp of the pair of fixing rollers 23, the halogen lamp 4 as the exposure lamp, and each motor 32 to 40, etc.
It performs the copying operation described above.

Among the above motors 32 to 40, motor 35°37.40
and a toner motor 7 that supplies toner to the developing device 12.
7 is connected to the main processor group 7 via a motor driver 78.
The motors 32 to 34 are controlled by the first sub-processor group 72 via a pulse motor driver 79, and the motors 36, 38, and 39 are controlled by a pulse motor driver 80.
It is controlled by the second sub-processor group 73 via.

Here, 32 is a lens motor, which is a motor for moving the position of the magnification changing lens block 8 for performing magnification changing. A scanning motor 33 is a motor for moving the halogen lamp 4, the mirror 5, and the mirror 6.7 for scanning the original. 34
is the shutter motor, and the photosensitive drum 10 when changing the magnification.
This is a motor for moving a shutter (not shown) for adjusting the charging width by the charger 11.

A developing motor 35 is a motor for rotationally driving the developing roller (sleeve) of the developing device 12 and the like. 36 is a drum motor, and the photosensitive drum 10
This is a motor to drive the rotation. A fixing motor 37 is a motor for rotationally driving the paper conveying path 22, the pair of fixing rollers 23, and the pair of paper ejecting rollers 24. Reference numeral 39 denotes a paper feed motor, which is a motor for rotationally driving the pair of registration rollers 19. A fan motor 40 is a motor for rotationally driving the cooling fan 29.

The halogen lamp 4 is controlled by the main processor group 71 via the lamp control section 81, and the halogen lamp 23a
is controlled by the main processor group 71 via the lamp control section 82. Then, the first processor from the main processor group 71
．． Drive/stop commands for each motor are sent to the second sub-processor group 72, 73, and A status signal indicating the drive/stop state of each motor is sent from the second sub-processor group 72-73 to the main processor group 71.

The first sub-processor group 72 also includes motors 32 to 32.
Position information from a motor position sensor 83 that detects each initial position of 34 is manually input. These first. The second sub-processor group 72, 73 counts reference clock pulses using, for example, a microcomputer and set values supplied from the microcomputer. A programmable interval timer, etc. that controls the
R is made.

FIG. 1 shows a schematic configuration of the lamp control sections 81 and 82. These lamp control units 81 and 82 include a lamp drive circuit 100 for lighting the 10-gen lamps 4 and 23a, an AC power source 101, and a lamp 4 and 23a, respectively.
A current detection element 102 serves as a detection means for detecting a flowing current, and a breaker 103a serves as a stop means for cutting off the power supply line to the lamps 4, 238 in the event of abnormal lighting.
.

103b. In addition, as the self-detecting means, it is possible to use not only the current detection element 102 but also a photoelectric conversion element for detecting the amount of light, for example, by providing a photoelectric conversion element in the vicinity of the above-mentioned 10-gen lamps 4 and 23a. be.

Even if the lamp drive circuit 100 (which together with the power supply line constitutes a supply means) has a +1SSR (Norirad
The AC power source 101 is configured to supply power from the AC power source 101 to each of the lamps 4 and 23a via a power supply line in response to the supply of operation signals from the main processor group 71. It has become.

The current detection element 102 detects the supply of current to the lamp 4.23a, and sends the result to the main processor group 71.
It is designed to output to .

The breakers 103a and 103b are operated by a stop signal supplied from the main processor group 71 based on a judgment that the lamps 4 and 23a are abnormally lit based on the output of the current detection element 102, for example, when the lamps are not being driven. The power supply line to 4.23g is cut off.

Next, the operation at the time of abnormal lighting in the above configuration will be explained. Now, suppose that the lamp 4 is turned on due to noise from the AC power supply 101, for example, at a time other than when the electric lamp 4 is turned on. Then, the current flowing through the lamp 4 is detected by the current detection element 102.

On the other hand, the main processor group 71 to which the output of the current detection element 102 is supplied determines abnormal lighting (malfunction) of the lamp 4 based on this, and
Outputs a stop signal to That is, the main processor group 71 detects the current flowing into the lamp 4 from the current detection element 102 of the lamp control section 81 even though the operation signal is not supplied to the lamp drive circuit 100 of the lamp control section 81. If this occurs, it is determined that the lamp 4 is abnormally lit, and a stop signal is output to operate the breakers 103g and 103b.

In this way, when the stop signal is supplied from the main processor group 71, the power supply line to the lamp 4 is cut off.
The breakers 103a and 103b are operated. This immediately blocks the flow of current to the lamp 4.

Therefore, it is possible to prevent wasted power consumption and damage to the machine body, such as cracking of the document table or scorching of the document cover, and furthermore, it can improve safety. It is.

Note that when the main processor group 71 determines that the lamp 4 is abnormally lit, it displays a message to that effect on the display section 30c of the operation panel 3°.
This is displayed to notify the operator (user). As a result, the operator can be informed of the cause of the machine's operation stoppage, and unnecessary machine checks can be omitted, reducing the time and effort involved.

Similarly, the halogen lamp 23a of the fixing roller pair 23
If the lamp lights up abnormally, the breaker 10 of the lamp control section 82
3a and 103b are operated under the control of the main processor group 71. In this way, the halogen lamp 23a
By instantaneously blocking the current flowing to the aircraft, it is possible to reliably prevent unnecessary power consumption and damage to the aircraft, and safety is also improved.

As described above, a means for determining abnormal lighting of the halogen lamp is provided, and when abnormal lighting is determined, current flowing to the halogen lamp is immediately blocked. This makes it possible to stop lighting the halogen lamp before the aircraft suffers any damage.

Therefore, wasteful consumption of electric power can be prevented and energy can be saved, and the aircraft can be provided with excellent safety without being adversely affected.

In the above embodiments, an electronic copying machine having a scanner for reading an original image and a fixing device for fixing the image is used as an image forming apparatus. It can also be applied to fusing devices such as, and even scanners that can handle facsimile machines.

Further, the lamp is not limited to a halogen lamp, and may be a fluorescent lamp, for example.

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

[Effects of the Invention] As described in detail above, according to the present invention, it is possible to provide an image forming apparatus that can prevent wasteful consumption of power and adverse effects on the machine body, and further improve safety.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a block diagram showing an example of the configuration of a lamp control section, and FIG. 2 is an external perspective view schematically showing the configuration of an electronic copying machine according to the present invention. Figure 3 is a configuration diagram showing the inside of the copying machine, and Figure 4 is a configuration diagram showing the inside of the copying machine.
The figure is a plan view showing an example of the configuration of the operation panel, and FIG. 5 is a block diagram showing the overall configuration of the control circuit. 1... Copying machine body, 4... Halogen lamp (light source)
23...Fixing roller pair, 23a...Halogen lamp (light emitter) 71...Main processor group (control means), 81.82...Lamp control unit, 100...Lamp drive circuit, 101... ...Power supply, 102...Current detection element (detection means), 103a. 103b...Breaker (stopping means). Applicant's agent Patent attorney Takehiko Suzue

Claims (3)

[Claims] (1) a light source for exposing a document; a power source for lighting this light source; a supply means for supplying electric power from this power source to the light source; a control means for driving and controlling this supply means; A detection means for detecting lighting of the light source when the supply means is not being driven, and a stop means for blocking the supply of power by the supply means when the detection means detects lighting of the light source. An image forming apparatus characterized by: (2) A fixing device that fixes a developer image on a transfer material by heat generated by a light-emitting body; a power source for generating heat in the light-emitting body of this fixing device; and a supply means for supplying power from this power source to the light-emitting body. a control means for driving and controlling the supply means; a detection means for detecting heat generation of the light emitter when the control means is not driving the supply means; and a detection means for detecting heat generation of the light emitter when the control means is not driving the supply means. an image forming apparatus comprising: a stop means for preventing the supply means from supplying power when the supply means is activated. (3) The image forming apparatus is configured to include a display means for displaying that the power supply by the supply means is blocked by the stop means. 2) The image forming apparatus described above.