JPS6120976A - Dew condensation resolving device of photosensitive body - Google Patents

Abstract

PURPOSE:To make the mechanism of a copying machine compact by providing a heater heating a photosensitive body on the prescribed position of the photosensitive body and providing a controller which controls heating of the heater in accordance with the detected state of a dew condensation sensor. CONSTITUTION:If dew condensation occurs in the copying machine, especially, a photosensitive belt 1, the dew condensation sensor 11 provided near the belt 1 detects this state to generate a dew condensation signal. A transistor TR of a switching circuit 12 is turned on by this signal to flow an electric current to a heater 5. Then, an aluminium belt revolving shaft 4 is heated from inside, and the belt 1 is warmed from the rear face, and water drops stuck to the surface of the belt 1 are vaporized. When the dew condensation state on the belt surface is resolved, the dew condensation signal from the dew condensation sensor 11 is stopped, and the TR of the switching circuit 12 is turned off, and the current supply to the heater 5 is stopped.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a dew condensation eliminating device for a photoreceptor in a copying machine, and in particular, when dew condensation occurs on the surface of the photoreceptor, to remove water droplets and cover
Regarding aircraft H.

(Prior Art) In a commonly used copying machine, even when the copying machine is not in use, it is kept turned on and the fuser roll, etc. are kept heated. The interior of the copying machine is heated by heat generated from the fixing device and the like.

However, on holidays or at night, the power to the copying machine is sometimes turned off, which causes the interior of the copying machine to cool down, especially when the room is humid or in humid seasons. In addition, in cold regions where there is a large difference in temperature between when the heating is turned on and when the heating is turned off, dew condensation may occur on the surface of the photoreceptor and other members.

Generally, if condensation forms on the lenses and mirrors installed inside a copying machine, the original image projected onto the photoreceptor may become distorted or disappear. In this case, the adhesion of toner, etc. to the surface of the photoreceptor becomes weak, or uneven potential occurs on the surface of the photoreceptor.
The disadvantage is that development is not carried out in a good condition, which tends to cause image deterioration.

Therefore, various dew condensation prevention methods have been used in the past. For example, you can blow hot air from the outside of the copier using a hair dryer, etc., heat the inside of the copier to dry it, or use an electric blanket when the copier is turned off. In order to keep customers warm from the outside at all times by using heating parts such as There are also some that perform heating.

However, all of these methods may increase the cost of the copying machine or cause excessive drying of the parts of the copying machine, and furthermore, they may reduce the efficiency and safety of copying. There are also many problems in this respect. In addition, since conventional copying machines are not equipped with sensors, etc., condensation occurs on the photoreceptor, which can be detected by the fact that the copies are unclear after making several copies. This often results in excessive use of paper and condensation due to copy errors! Moreover, it has the disadvantage that extra time is wasted even after copying has started.

(Problems to be Solved by the Invention) The present invention provides a device that automatically detects dew condensation on the surface of a photoreceptor in a copying machine using a sensor and automatically eliminates the dew condensation. The purpose is to

(Means and effects for solving the problem) The present invention has the following features:
A sensor is installed facing a predetermined position of the photoreceptor to detect the state of dew condensation on the surface of the photoreceptor.In addition, in a copying machine using an endless belt-shaped photoreceptor, a sensor is installed inside the roller that drives the photoreceptor belt. , a rod type heater is provided, and a control device is further provided to control the heater in accordance with the output of the dew condensation sensor.

A sensor detects the state of dew condensation on the surface of the photoreceptor belt, and depending on the state, the heater is automatically turned off.
By performing N, OFF control, the dew condensation state is eliminated.

Therefore, in the apparatus of the present invention, the heater operates and heats the copying machine only when dew condensation occurs, so there is no need to perform extra heating as in conventional copying machines, and the effect of the apparatus is enables practical operation.

(Embodiment) An embodiment of the present invention will be described with respect to a copying machine equipped with an endless belt-like photoreceptor. As shown in FIG. A dew condensation sensor 1 or 11 is provided at a predetermined position along.

The photoreceptor bell 1-1 is wound around a drive shaft 2, a tension shaft 3, and a bell 1 to a rotation shaft 4, and is attached to a copying machine.
It is supported by a system structure. Then, the document placed on the platen of the copying machine is scanned by a scanning lamp, and the image is transmitted through an optical device consisting of a lens and a mirror to form a latent image at a predetermined position on the photoreceptor belt. There is. Next, toner is supplied to the photoreceptor belt by a developing device to develop the latent image, and the transfer roller 1-13 transfers the latent image onto the paper fed from the paper feed cassette 10 by the paper feed roll 9. I try to do that.

The paper onto which the image has been transferred is heated by the user roll 6 of the fixator, the image is fixed, and the copy is completed.

In the paper conveyance device used in the apparatus of the present invention,
Paper is fed one by one from a paper feed cassette 10 by a paper feed roll 9, passes between guide plates 7b and 7c of a chute 7, and after timing is adjusted by a roller 8, runs together with a photosensitive 14' belt 1. Transfer corotron 13
The image is transferred, guided by a guide plate 7a, and sent through a fixing device 6 to an output tray.

The photoreceptor belt 1 used in the apparatus of the present invention has a structure similar to that commonly used, but a rond-shaped heater 5 is attached to the inside of the belt rotation shaft 4. , furthermore, a dew condensation sensor 11 is located at a predetermined position on the belt 1 and very close thereto.
is provided.

The dew condensation sensor 11 and heater 5 described above are connected to a control circuit of a control device as shown in FIG. In this control circuit, the output terminal of the dew condensation sensor 11 is connected to a switching circuit 13, and the switching circuit 12 is connected to a heater type it! It is connected to the heater rod 5 via 14. As this switching circuit 12, for example, a transistor element is used.

Next, the operation of this condensation-proof 1L stomach pack will be explained.

When condensation occurs inside the copying machine, especially on the photoreceptor belt 1, the dew sensor 11 installed in the vicinity of the photoreceptor belt 1 detects the condition and generates a dew condensation detection signal. Jru. This signal causes switching circuit 1
Turn on the 1~ transistor of 2, and as a result, the heater 5
A current flows through.

For this purpose, the rotating belt MJ4 made of aluminum is heated from inside, and the heat warms the photoreceptor bells 1 to 1 (the back surface is made of aluminum) from the back side. Therefore, water droplets adhering to the belt surface will evaporate. Bell 1 in this situation
By rotating the rotor 1, it is possible to evaporate water droplets from the entire surface of the rotor 1 in a short time, and the time required for this is less than 5 minutes.

When the condensation state is eliminated from the belt surface, the dew condensation signal from the dew condensation sensor 11 is stopped. As a result, the transistor of the switching circuit 12 is turned off,
Power supply to the heater 5 is stopped.

In this way, the switching circuit 12 connects the dew condensation sensor 1
Depending on the output of 1, the heater 5 is automatically turned 0N-OFF.
The belt 1 is heated only when dew condensation occurs on the surface of the belt.

In the above embodiment, − number of sensors are installed to detect dew condensation on the belt, but it is also possible to provide multiple sensors, and any one of the sensors can detect dew condensation. It is also possible to activate the heater 5 from time to time.In that case, it is a good idea to provide an OR gate in the switching circuit so that the heater 5 is heated no matter which sensor detects condensation. Become.

I, II, I - In the described embodiment, the photoreceptor
Although an example is shown in which a CC endless heddle-shaped photoreceptor is used, it is easy to see from the structure that b'r'fU can be used in a copying machine equipped with a photoreceptor drum according to the present invention. There are 11 things to do.In general, in a copying machine, the photoreceptor is the part that is most likely to come into contact with the outside air, and other optical devices such as lens mirrors etc. is installed in a sealed state, so dew condensation is unlikely to occur; however, if dew condensation occurs on the photoreceptor, for example, a similar condition may occur on other parts. By estimating that the photoconductor is being burned and heating the photoconductor as well as other parts, the copying machine can be kept in good condition.

(Effects of the Invention) Since the apparatus of the present invention has the /JtFi configuration as described above, when no dew condensation occurs on the photoreceptor belt, the heater is not heated and the inside of the copying machine is heated. No extra heat is generated, and the amount of power consumed to eliminate condensation is extremely low.

Furthermore, the present invention makes it possible to evaporate water droplets on the surface of the bell 1 in a very short time, thereby reducing the waiting time of the copying machine and increasing the efficiency of copying. It makes it possible to improve.

In addition, since the heater of the present invention is installed within the belt rotating shaft, it does not take up much space for installation and does not require extra space inside the copying machine, making the mechanism of the copying machine compact. It allows for the formation of

[Brief explanation of the drawing]

FIG. 1 is a schematic cross-sectional view of the main parts showing the configuration of a copying machine according to the present invention, and FIG. 2 is a block diagram showing a control circuit of a dew condensation eliminating device. Reference numeral 1 in the figure: belt photoreceptor, 2: drive shaft,
3...Tension shaft, 4...Belt rotating shaft, 5...Heater rod, 6...Hiuser-17...Shikoto, 8... ...Roller, 9...Paper feed roll, 10...Paper feed cassette], 11...Dew condensation sensor, 12...
... Switching circuit, 13 ... Transfer rollers 1 to 14, power supply for heater. Figure 1 Figure 2

Claims (1)

[Claims] A dew condensation sensor is provided close to a predetermined position of the photoreceptor, a heater for heating the photoreceptor is further provided at a predetermined position of the photoreceptor, and heating of the heater is controlled in accordance with detection by the dew condensation sensor. A dew condensation eliminating device for a photoconductor, characterized in that it is provided with a control device for.