JPS5855964A - Image forming device - Google Patents

Abstract

PURPOSE:To stop a copying machine by preventing copy papers ejected at the time of faults of an exposing lamp from being blacken in a solid state, by operating one destaticizing means when the other of plural destaticizing means is out of order. CONSTITUTION:When a lamp on-signal HSS to become high level at lighting time of a lamp for exposure and a lamp lighting control signal HS for exposure from a microprocessor 60 are processed and an exposure lamp is out of order, the output of a circuit 63 is inverted to a high level. This signal becomes an alarming signal and at the same time by operating an driving amplifier 62 for lighting control of a blank lamp 51, a photosensitive drum 8 is destaticized. When this lamp 51 is out of order, a group 51' of black vanishing miniature lamps is lighted by the same way. Therefore, when an exposing lamp is out of order, ejected copy paper are prevented from being blacken in a solid state and a copying machine is stopped, and the loss of the copying machine becomes less and the process part of a fixing device etc. is operated moderately.

Description

[Detailed description of the invention] The present invention relates to an image forming apparatus for copying, etc.

Normally, in a copying machine, if the image mist lamp is out of order, not only will it not be possible to form an image on the transfer paper, but also the sheet that has been ejected after one transfer will be flat.

Continuous operation without the operator's knowledge during multi-copying (continuous operation without the operator's knowledge) will result in waste of transfer paper and incubating agent, and will also put stress on the cleaner and fixing device, causing inconvenience.To prevent this, there is a means to detect lamp breakage. Some devices are equipped with such a device that the copying operation is immediately stopped when a disconnection is detected.

However, in this case, the transfer paper remains stopped inside the machine, causing a jam when restarting.

Therefore, it is conceivable to prevent continuous reversal by detecting lamp breakage and not immediately stopping the paper and not feeding the paper later.

However, in this case as well, the transfer paper that has already been fed will be completely black9, and the cleaner and fixing device will be strained.

The present invention eliminates the above-mentioned inconveniences, does not cause discomfort to the operator even if the light lamp etc. breaks, minimizes loss in the copying machine, and prevents strain on each process part. This is what I did.

For example, in response to a failure in the image exposure rung, a blank exposure lamp or the like is turned on to protect the developer, cleaner, fixing device, etc., while executing the stop sequence. Furthermore, a warning is displayed to notify the operator of the cause of the stoppage of the sequence or the cause of the white image.

In other words, if the sequence requires that the image exposure lamp be turned on in the near future, or if there is an accident where it suddenly goes out while it is already on, use the Kti blank exposure lamp, and if this lamp is inconvenient, use the black lamp in the drum width direction It is necessary to immediately turn on all the lamps to prevent the sheets to be discharged from being completely black, and to execute a stop sequence.

On the other hand, in the case of an accident with the blank exposure lamp, the static elimination effect on the g+ pot body is impaired, so the static elimination effect is increased by lighting all of the iii* exposure lamps or the above-mentioned black poppy lamps at this time.

The present invention will be explained below with reference to FIG. 1 of an example of a copying machine.

This is an electrophotographic copying machine using a powder image transfer method.
i Align the leading edge of the document O@ to be copied with the reference position of the document platform and ridge it on the transparent document platform, and then cover the document cover 2.
hold it down. Lower Kti document illumination lamp 6 of document placement table 1, movable Z cooler 4.5. Fixed in-mirror lens 6
A mirror 7 and a photosensitive drum 8 are arranged at the position shown by the solid line in the figure. Further, a fan 50 is provided to cool the document table which is heated by the document illumination lamp.

When a copy key (not shown) is pressed, the photosensitive drum 8 starts rotating in the clockwise direction shown in the drawing, and each charger and each lamp, which will be described later, starts operating, and at the same time, the document illumination lamp 3 and movable mirror 4, which are the movable parts of the optical system, start operating. .5 Move to the position indicated by the broken line in the diagram. When the photosensitive drum 8 completes a predetermined rotation, a signal to start exposure is issued, and the document illumination rung 3. The first mirror 4 starts moving rightward from the broken line position in the figure at the same speed as the circumferential speed of the photosensitive drum 8, and the second mirror 5 starts moving rightward from the broken line position in the figure at half the speed.

Original 0 illuminated from below by the original illumination lamp 3
- The image of movable mirror 4.5. An optical system consisting of an in-mirror lens 6, a mirror 7, etc. allows the photosensitive drum 8 to be exposed at the exposure section 9.
rise to the top. When the exposure is completed according to the signal according to the size, the document illumination lamp 3° is turned off, and the lamp 3. Movable mi? -4, 5ti Stop the movement to the right in the drawing and immediately return to the opposite direction, that is, to the left in the drawing. The above operation is repeated according to the number of copies specified in advance by a key (not shown).

When the exposure for the specified number of sheets is completed, the document illumination rung 3
．． Movable 2ler 4, 5t-! It returns to the predetermined position indicated by the illustrated concentrated line and stops. It should be noted that the speed of movement to the right is higher than the speed of movement to the right (copying efficiency is increased. Here, the 51 Korean lamp 3 is a blank lamp that lights up when it is off and turns off when it is on, and the toner retention when not exposed. Reduce output as much as possible.

The photosensitive drum 8Fi has a photosensitive layer covered with a transparent insulating layer, and rotates clockwise in the drawing as shown in 5 as described above.

The photosensitive drum 8 is first supplied with an AC high-voltage current from a high-voltage power supply (not shown), and then the photosensitive drum 8 is charged with an AC static eliminator 10.
At the same time, the rung 11 is exposed to light to erase charges on the surface of the insulating layer and inside the photosensitive layer, and then the primary charger 12 supplies (+)K with a high voltage current of (+) from a high voltage power supply (not shown). charged. Subsequently, when reaching the exposure section 9, the light from the illumination section 13 is exposed to slit light, and at the same time, the electric current is removed by an AC static eliminator 14 to which an AC high voltage current is supplied from a high voltage power source (not shown). Then, by exposing the entire surface to light from the lamp 15, an electrostatic latent film is formed on the surface of the photosensitive drum A8Fi, and the film enters the developing device 16. The developing device 16 has a developer row 517, a developer row 218, and a developer row 218. Consists of 19 doctor blades and 1BK developing roller! Due to the gaseously adsorbed developer, the surface of the photoreceptor drum 8 is
Visualize.

Next, the transfer paper P fed from the paper feed section is transferred to the photosensitive drum 58.
The image on the photosensitive drum 8 is transferred to the transfer paper P by being charged with a (+) high voltage current from the high voltage power source by the transfer charger 20.
transferred on top. After the transfer paper P has been transferred, the charge is removed by a separation static eliminator 21 to which AC high voltage current is supplied from a high voltage power source, and the attraction force between the transfer paper P and the photosensitive drum 8 is weakened. Subsequently, the transfer paper P is sucked by the roller 23 in the 22nd section, separated from the photosensitive drum 8, and then transferred to the belt 24. The guide 25 guides it to the fixing section 26 . The remaining developer is wiped off by the edge portion 271 of the blade cleaner 27 that is in pressure contact with the photosensitive drum 8Fi, and the next cycle is repeated again.

After repeating the cycle for a predetermined number of sheets, the rotation is continued, and the internal charge of the photosensitive layer is removed by the above-mentioned AC static eliminator 14 to eliminate static electricity and the entire surface to be exposed by the lamp 15. Stops after rotating a certain amount.

Furthermore, as shown in Fig. 4, there is a blank lamp 51 which is long in the drum width direction.
A black eraser lamp 51' is provided for both sexes, and the lamp is selectively turned on depending on the copy size and magnification regardless of whether the image is exposed or not.

Figure 2 shows each circuit for lamp lighting compensation control, and is a micro-pro drive for performing the above-mentioned sequence operation using the signal CPB from the 60-digit copy key and the pulse cbocy generated by the rotation of the drum. It is a drive amplifier for outputting the signal HDS for lighting the halogen lamp 3 and for outputting the signal BD8 for lighting the 62Fi blank lamp 51, and 63 and 64 are exclusive OR gates for lamp switching control. A signal Has from the halogen lamp sensor 52 (1 when the lamp is on) is input to 66, and a signal 888 from the blank lamp sensor 53 (1 when the blank is on) is input to 64. Halogen sensor 52#i! 1t sea urchin, planxe/s 5
It is provided near the 3Fi light incidence as shown in FIG. Of course H
8S, B88Fi each lamp drive amplifier 61.62
It may be a signal obtained by converting the output of the signal using a resistor. 65
is a diode that prevents signal interference.

The operation will be explained with reference to FIGS. 5-1 to 3-4.

FIG. 3-1 shows an example in which a blank lamp is turned on when the halogen lamp burns out while the halogen lamp is turned on. In the figure, 21EG indicates the operating times of the restaurant row 257, the paper feed roller O, 51, and the halogen 1 blank lamp. The dotted line is during normal operation.

That is, when the lamp goes out while the halogen is on, the lighting signal H8 from the processor becomes 1 while H88 becomes 0.

Therefore, 1 is output from the exclusive I gate 63 to forcibly turn on the blank drive amplifier 62 and turn on the blank lamp.

FIG. 3-2 shows an example in which blanking is continued when the halogen lamp is not lit from the beginning regardless of the lighting timing, and the circuit operation is similar to that in FIG. 3-1.

Figure 3-5 shows an example of turning on a halogen lamp when the blank lamp burns out, wIi3-4
The figure shows an example in which the halogen lamp is turned on from the beginning when the blank lamp is not turned on from the beginning regardless of the lighting timing. Both are exclusively controlled by a blank senna signal 888 and a blank lighting signal BS.

In Figures 3-1 to 3-4, the operation of the drum and each lamp is stopped after a predetermined period of time in the event of an abnormality.

The above-mentioned circuit is connected to the black-out lamp 51' and the halogen lamp 3, or the black-out lamp 51' and the blank lamp 5.
1 or between these three lamps, when one or both of the halogen lamp and the blank lamp burns out, the blackout rung 51' can be fully lit and the same effect can be obtained.

Also, the output of 63.64 (exclusive game) causes the display lamp HL,
Lights up BL to warn that one lamp is disconnected. If both HL and BL are lit, you know that both lamps are burnt out.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of a copying machine system to which the present invention can be applied. Figure 2 is a side view of the control circuit in the present invention, and Figures 3-1 to 3-4
i Figure 2 is an operation time chart, Figure 4 is a plan view of the vicinity of the blank lamp, 3 is a halogen lamp, and 5 is a plan view of the vicinity of the blank lamp.
1 is a blank lamp, and 63° and 64 are exclusive OR gates. Applicant Canon Co., Ltd.

Claims (1)

[Scope of Claims] 0) In an image forming apparatus having a plurality of static eliminators, when one of the plurality of static eliminators becomes abnormal, the other one is activated. When the light irradiation means in the state is an image exposure means, the light irradiation means to be operated is a blank exposure means, and the blank means is turned on when the image W stage does not light up when its operation is commanded or when it goes out during the image exposure operation. In the case of an image rank exposure means, the light irradiation means to be operated is a tube exposure means, and when the blank exposure means does not light up when the operation is commanded or is turned off during the blank exposure operation, the image exposure means (5) An image forming apparatus characterized by causing a warning display to be displayed when the image exposure means or the blank exposure means is abnormal in @ Section 2.3. (5 ) The image forming apparatus according to item 2.3, characterized in that when both the image exposure means and the blank exposure means are abnormal, another irradiation means or charge eliminating corona means is operated.