JPH0467029A - Copying machine - Google Patents

Abstract

PURPOSE:To keep the temperature of an original platen glass equal to or under a set temperature by controlling the revolving speed of a cooling fan in accordance with a temperature detected by a temperature sensor which detects the temperature of the original platen glass. CONSTITUTION:This machine is provided with a control means for controlling the revolving speed of the cooling fan 34 in accordance with the temperature detected by the temperature sensor 35 which detects the temperature of the original platen glass 2. Since the temperature of the glass 2 is detected by the temperature sensor 35 provided on the cover 1 which contacts with the glass 2, in such a case, the temperature of the glass 2 is accurately detected. Thus, the revolving speed of the fan 34 is controlled so that the temperature of the glass 2 may not be equal to or above the set value, and then the temperature of the glass 2 is kept equal to or under the set temperature.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention irradiates a document placed on a document table glass with light,
The present invention relates to a copying machine that exposes a photosensitive recording medium to this reflected light.

[Conventional technology]

Conventionally, light is irradiated from a light source onto a document placed on a document platen glass, a photosensitive recording medium is exposed to the reflected light, and the photosensitive recording medium and recording paper are combined and subjected to pressure development to create this recording paper. Copying machines that copy the original document are known. There are several types of photosensitive recording media depending on the purpose and use.
Each of these has different photosensitive characteristics, development characteristics, etc. depending on the manufacturing process, raw materials, type, etc. Therefore, when exposing and developing a photosensitive recording medium, each photosensitive recording medium needs to be subjected to optimal processing conditions. For example, exposing a photosensitive recording medium to light reflected from a document may require high illuminance, and in this case, it is necessary to increase the luminous intensity of the light emitted from the light source. For this reason, when the luminous intensity of the light source is increased, the temperature of the document table glass may become considerably high due to the heat of the light emitted from the light source. Furthermore, when making multiple copies of an original, it is necessary to irradiate light from a light source onto the document glass for a long time, and in this case, the temperature of the document glass becomes considerably high due to the heat from the light. .

Therefore, a cooling fan for cooling the document table glass is provided in the copying machine near the document table glass, and a temperature fuse is provided in the exposure section to prevent excessive temperature rise when the exposure section goes out of control. The capacity, number, and rotation speed of the cooling fan were determined through experiments so that the temperature of the document glass did not exceed the set temperature, and the rotation speed of the cooling fan was constant regardless of the temperature of the document glass.

[Problem to be solved by the invention]

However, in such conventional copying machines, the temperature of the platen glass is not directly detected, and if the temperature of the platen glass exceeds the set temperature, the color of the original will change. There was.

SUMMARY OF THE INVENTION An object of the present invention is to provide a copying machine that accurately detects the temperature of a document glass plate with a temperature sensor and controls the rotation speed of a cooling fan based on the temperature of the document glass plate.

[Means to solve the problem]

In order to achieve such an objective, the present invention includes:
a document table glass on which a document is placed, a document table cover disposed to press and fix the document to the document table glass, and a light source that illuminates the document through the document table glass;
In a copying machine equipped with a cooling fan that cools the document table glass that is heated by the light emitted from the light source,
A temperature sensor for detecting the temperature of the document table glass is provided on the document table cover, and a control means is provided for controlling the rotation speed of the cooling fan according to the temperature detected by the temperature sensor. It is.

Alternatively, the device includes a document table glass on which a document is placed, a document table cover disposed to press and fix the document to the document table glass, and a light source that illuminates the document through the document table glass. In a copying machine, a temperature sensor for detecting the temperature of the original platen glass is provided on the original platen cover, and when the temperature detected by the temperature sensor exceeds a set temperature, copying is continued until the temperature falls below the set temperature. The configuration includes a control means that puts the device into a standby state.

[Effect]

When copying an original, it is necessary to increase the intensity of the light emitted from the light source in order to expose the photosensitive recording medium to high illuminance, and it is also necessary to move the original stage glass multiple times to copy multiple sheets of the original. , the glass may be irradiated by a light source for a long period of time. In this case, the temperature of the glass increases due to the heat from the light source, and there is a possibility that the temperature of the glass may exceed the set temperature. Therefore, the temperature of the glass is detected by a temperature sensor, and the CP of the control section is adjusted according to the detected temperature.
A drive signal is output from U to the fan drive motor. The cooling fan is rotated by a fan drive motor. At this time, since the temperature of the glass is detected by a temperature sensor provided on the document table cover in contact with the glass, the temperature of the document table glass can be detected accurately.

Alternatively, if the temperature detected by the temperature sensor is determined by the CPU of the control unit to be higher than the set temperature, the CPU
A signal is output from the PU to the drive unit, the irradiation of light from the light source and the movement of the glass are stopped, and copying is placed in a standby state.

〔Example〕

Hereinafter, the present invention will be explained based on the drawings. 1 to 4 are diagrams showing an embodiment of a copying machine according to the present invention. First, the configuration will be explained.

In FIGS. 1 and 2, the copying machine 40 has a top plate portion that is movable in the left-right direction and includes a document table glass (hereinafter referred to as glass) 2 and a document table cover (hereinafter referred to as cover) 1.
A desired original (not shown) is placed face down on the glass 2.

A light source 3 is fixed to the upper right side of the copying machine 40 in a direction perpendicular to the moving direction of the glass 2, and the light source 3 is housed in a casing 31. A slit 32 is formed on the top surface of the casing 31 toward the glass 2, and the light from the light source 3 passes through the slit 32 and irradiates the glass 2 with linear light.

A keyboard 33 is disposed on the front side of the upper surface of the casing of the copying machine 40. When the keyboard 33 is pressed, light is emitted from the light source 3, and the glass is moved in the left and right directions in FIG. 2 by a drive unit (not shown). The entire surface of the glass 2 from the left end to the right end is sequentially irradiated. At this time, in order to prevent the temperature of the glass 2 from becoming high due to heat from the light source 3, a cooling fan 34 is disposed on the side of the casing 31, and a fan drive motor (not shown) is operated to prevent the temperature of the glass 2 from becoming high. When rotated, the glass 2 and the light source 3 are cooled.Also, as shown in FIG. A temperature sensor 35 is provided for detecting whether the temperature of the glass 2 is higher than a set temperature.The irradiated light from the light source is transmitted through the transparent glass 2 and reflected by the document placed thereon. The reflected light from the original enters lens 5. Lens 5
The light condensed by the color filter unit 4 is reflected by two reflecting mirrors 6, and this reflected light is
A microcapsule paper 22 as a photosensitive recording medium whose direction is changed by two reflecting mirrors 6 and is brought into close contact with the lower part of the exposure table 7
imaged on top.

The elongated microcapsule paper 22 is stored in a removable cartridge 23, and the microcapsule paper 22 is guided by various rollers and passed below the exposure table 7, and then supplied to the pressure developing device 8. After that, the microcapsule paper 22
In the lower part of the copying machine 40, which is guided by the peeling roller 1 and the meandering adjustment roller 12 and then wound around the take-up shaft 13, there is a developer paper cassette 19 that stores the developer paper 21, which is recording paper made of plain paper. The developing paper 21 is taken out one by one by the half-moon roller 20 and then conveyed to the pressure developing device 8. Therefore, the microcapsule paper 22 and the color developing paper 21 are supplied to the pressure developing device 8 in a superimposed state. The microcapsule surface of the microcapsule paper 22 on which the latent image is formed and the developer-coated surface of the color developer paper 21 are inscribed together and sandwiched between the small diameter roller 9 and the backup roller 18 and pressurized. This pressurization destroys the unexposed microcapsules and forms an image on the color developing paper 21.

The MyFkalobusel paper 22 and the color developer paper 21 that have come out of the pressure developing device 8 are conveyed by the paper feed roller 1o, and then transferred to the peeling roller 1.
1, the MyFkalobusel paper 22 is placed upward, and the color developer paper 21
are separated orthogonally. The separated MyFkalobusel paper 22 is wound around a winding shaft 13 via a meandering adjustment roller 12. The color developer paper 21 is accelerated in color development by the heat fixing device H to form an image, and is then conveyed to the paper discharge tray 14 .

The heat fixing device H is a hollow heat roller 1 with a built-in heater 17.
6, a color developing paper feed roller 15, and the like.

Next, the action will be explained.

Place the original on glass 2, and place the original on glass 2 using cover 1.
Press to secure. When the keyboard 33 is pressed, the original on the glass 2 is illuminated by the light source 3, and the drive unit moves the glass 2 in the left-right direction in FIG. . At this time, as mentioned above, in order to expose the microcapsule paper 22 with high illuminance, it is necessary to increase the luminous intensity of the light emitted from the light source 3, and in order to copy multiple sheets of the original, the glass 2 may be moved left and right multiple times. The glass 2 may be irradiated with the light source 3 for a long time by moving the light source 3. In this case glass 2
The temperature increases due to the heat of the light from the light source 3, and there is a possibility that it will exceed the standard temperature.

Therefore, as shown in Figure 4, the temperature of the glass 2 is detected by a temperature sensor 35. The temperature data detected by the temperature sensor 35 is converted from analog to digital and then taken into the CPU of the control unit. In this CPU, the rotation speed is determined by a conversion formula of the rotation speed of the fan drive motor with respect to a preset temperature, and a drive signal is output from the CPU to the fan drive motor. The cooling fan 34 is rotated by the fan drive motor, but the glass 2
In order to keep the temperature below the set temperature, the rotation speed is set so that the higher the temperature, the higher the rotation speed.

In this way, since the temperature of the glass 2 is detected by the temperature sensor 35 provided on the cover 1 in contact with the glass 2, the temperature of the glass 2 can be detected accurately. Therefore, since the rotation speed of the cooling fan 34 is controlled so that the temperature of the glass 2 does not exceed the set temperature, the temperature of the glass 2 can be kept below the set temperature.

Next, another embodiment of this copying machine will be described with reference to FIG.

A temperature sensor 35 detects the temperature of the glass 2.

The temperature detected by the temperature sensor 35 is
If the CPU determines that the temperature is higher than the set temperature, this CPU
A signal is outputted to the driving section to stop the movement of the glass 2, and at the same time, the irradiation of light from the light source 3 is also stopped, and copying is put into a standby state. At this time, as shown in FIG. 1, the standby state is displayed on a display 1iE36 provided on the front side of the upper surface of the housing. Therefore, when the temperature of the glass 2 becomes equal to or higher than the set temperature, the irradiation of light and the driving of the drive section are immediately stopped, and the temperature of the glass 2 can be lowered to the set temperature or lower.

〔Effect of the invention〕

As explained above, according to the present invention, a temperature sensor for detecting the temperature of the document table glass is provided on the document table cover,
Since a control means for controlling the rotation speed of the cooling fan according to the temperature detected by the temperature sensor is provided, the rotation speed of the cooling fan is controlled according to the temperature of the document glass. The temperature can be lowered below the set temperature, and power consumption can also be saved.

Alternatively, a control means is provided that puts copying into a standby state until the temperature detected by the temperature sensor becomes equal to or less than the set temperature. The irradiation and driving of the original platen glass are stopped, and the temperature of the original platen glass can be lowered to below the set temperature.

36...Display section.

a.Applicant's agent stone Tai Man

[Brief explanation of the drawing]

Figure 1 or jll! 4 is a diagram showing an embodiment of a copying machine according to the present invention, FIG. 1 is a perspective view of this copying machine, FIG. 2 is a sectional view of this copying machine, and FIG. 3 is a sectional view of a document table cover. 4 is a block diagram of this control means, and FIG. 5 is a block diagram of the control means of another embodiment. 1... Original platen cover 2... Original platen glass, 3... Light source, 34... Cooling fan, 35... Temperature sensor,

Claims (1)

[Scope of Claims] 1. A document table glass on which a document is placed, a document table cover provided to press and fix the document to the document table glass, and a device for irradiating the document through the document table glass. In a copying machine equipped with a light source and a cooling fan that cools a document glass heated by the light emitted from the light source, a temperature sensor for detecting the temperature of the document glass is provided on the document glass cover, A copying machine comprising a control means for controlling the rotation speed of the cooling fan in accordance with the temperature detected by the temperature sensor. 2. A document platen glass on which a document is placed, a document platen cover provided to press and fix the document to the document platen glass, and a light source that illuminates the document through the document platen glass. In a copying machine, a temperature sensor for detecting the temperature of the original platen glass is provided on the original platen cover, and when the temperature detected by the temperature sensor exceeds a set temperature, copying is continued until the temperature falls below the set temperature. A copying machine characterized by being provided with a control means for setting it in a standby state.