JPH03146937A - Copying device provided with cooling fan - Google Patents

Abstract

PURPOSE:To prolong the life of a lamp by providing a temperature sensor near an original platen interrupting processing when a temperature becomes equal to or exceeds a specified value in a copying machine provided with a copying lamp which can move by taking a home position on the lower surface of the original platen as a reference and a cooling fan which moves with the lamp and sends air to a home position side. CONSTITUTION:At the time of starting copying, the temperature of a thermistor Th is detected to be stored and is compared with the reference temperature previously set. When the temperature in the vicinity of the original platen 2 is a little higher because of overheat, the processing for copying is temporarily interrupted. Next, the copying lamps 3 and 4 are turned off and the cooling fan 10 is moved to the trailing end of scanning length at that time, then the original platen 2 and the lamps 3 and 4 are cooled. Thereafter, when the detected value by the thermistor Th becomes equal to or below the specified value, a copying cycle is restored and the processing for copying is continued. Thus, a state where the temperature rises too high is avoided even in the case of consecutive copying, and the handling of an original is facilitated and the life of the lamp is prevented from being shortened.

Description

Detailed Description of the Invention (a) Industrial Application Field The present invention relates to a copying machine that scans an image of a document placed on a document table with a copy lamp and copies the image of the document through a photosensitive material. Regarding.

(bl) Conventional technology In a copying machine that copies an original image using a photosensitive material, the image of the original placed on the original platen is moved by a copy lamp installed below the original platen and movable along the original platen. Exposure by light.The light from the copy lamp is reflected by the original,
Light is distributed to the photosensitive material below the document table. Then, an electrostatic latent image or a selectively cured image is formed on this photosensitive material, and a copy image is obtained on paper through this. In order to obtain a clear image in such a copying machine, the original image must be exposed to light by a copy lamp having a sufficient amount of light. However, the copying lamp generates heat when it is turned on, and the document table facing the copying lamp is heated from the bottom surface and reaches a high temperature, making it impossible to replace the document. Furthermore, there is a problem in that the temperature of the copy lamp itself increases, resulting in a shortened lamp life.

Therefore, conventionally, a cooling fan that moves together with the copy lamp is provided to cool the document table and the copy lamp to prevent them from overheating.

(C1 Problem to be solved by the invention) However, in the past, the cooling fan was only activated while the copy lamp was being scanned or returned or when it was stopped at the home position, and the cooling rate could not keep up with the rate of temperature rise. Occasionally, the temperature would become too high.

The amount of light from the copying lamp is set according to the photosensitivity of the photosensitive material and the copy density, and when the photosensitivity is poor or when making pale copies, the amount of light is set to be high and the amount of heat generated increases. Further, the scanning length and scanning speed of the copy lamp are changed depending on the size of the paper to be copied, the magnification, etc., and the lighting time of the copy lamp is changed accordingly, so the amount of heat generated during copying of one sheet changes. Therefore, when making several copies in succession, the copy lamp may generate more heat than expected, causing the document table and the copy lamp to become overheated.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a copying machine equipped with a cooling fan that operates the cooling fan in response to an increase in temperature near the document table to prevent the document table and the copy lamp from being overheated.

(d) Means for Solving the Problems In this invention, the original to be copied is a! A document table on which the document is placed,
In a copying machine equipped with a copy lamp that is movable with reference to a home position on the lower surface of the document table, and a cooling fan that moves with the copy lamp and blows air toward the home position, a sensor that detects the temperature near the document table; , means for interrupting the copying process when the detected temperature of the sensor reaches a predetermined value set -L, and stopping and operating the cooling fan near the final end position of the scanning width of the immediately preceding copying process; It is characterized by

(e) Function In the present invention, when the temperature near the document table exceeds a predetermined value during continuous copying, the copying process is temporarily interrupted and cooling of the document table, etc. is concentrated. At this time, the cooling fan is stopped near the final end position of the scanning width and blows air toward the home position, so that the area heated by the copy lamp and the copy lamp are efficiently cooled.

(f) Embodiment FIG. 3 is a schematic front sectional view showing the configuration of a copying machine which is an embodiment of the present invention.

A document table 2 made of transparent hard glass is provided on the top surface of the copying machine main body 1. A copy lamp s is provided on the underside of this document table 2.
,4. Optical system W consisting of lenses 5 to 8 and lenses 9
13 are provided. Of this optical system device 13, the copy lamp 3.4 and the coolers 5 to 7 are connected to the base 1). 12
It is mounted on the document table 2 and is movable back and forth in the directions of arrows C and D on the lower surface of the document table 2. A cooling fan 10 is provided near the copy lamps 3, 4 and moves together with the base 1) on which the copy lamps 3.4 are mounted. Further, an exhaust port fan 14 is provided on one side of the copying machine main body 1, and exhausts air flowing in from an intake port, which will be described later, on the lower surface of the document table 2 from an exhaust port. Furthermore, a thermostat Th for detecting the temperature near the document table is arranged on the lower surface of the document table 2. Surf star Th is base 1),
It is arranged at a position that does not obstruct the movement of the camera 12 and is within the minimum scanning range. Normally, the scanning range of an original is set depending on the size of the original to be copied or the size of the paper (image receiving sheet) on which an image is formed. The sensor Th is arranged within the smallest range of the set ranges.

A pressure roller 4547 is provided in the center of the interior of the copying machine main body 1. This pressure roller 46°47 is located at the developing position P.
2. A cartridge 20 is mounted on the left side of this pressure roller 46,47. A supply shaft 24 and a take-up shaft 28 are pivotally supported on this cartridge 20 . A media sheet 2 in the form of a roll sheet is mounted on the supply shaft 24.
5 is wound. The surface of the media sheet 25 is coated with microcapsules having a particle size of about 10 to 20 μm and containing a leuco dye and a photocurable substance. This media sheet 25 is conveyed from a cartridge 20 made of a light-shielding material to a development position P2 via rollers 31 and 43, and then wound onto a take-up shaft 28. The light reflected from the copy lamp 3.4 from the original is distributed to an exposure value iW P 1 through mirrors 5 to 8 and a lens 9, as shown by the dashed line in the figure. This exposure position P1
A copying machine main body 1 in which a buffer roller 43 is movable in directions of arrows A and B between and a developing position NP2.
On the other side of the paper tray 70 and paper cassette 7
1.72 is installed. Each of the paper tray 70 and the paper cassette 7172 stores image receiving sheets 73 of different sizes. This image receiving sheet ma
is coated with an acid that reacts with the leuco dye contained in the microcapsules coated on the media sheet 25 to cause the leuco dye to develop color. The image receiving sheet 73 stored in the paper tray 70 and the paper cassette 7172 faces the paper feed rollers 74 to 76, and the image receiving sheet 73 is rotated selectively by the paper feed rollers 74 to 76.
3 are fed one by one to the tie-up roller 49. The tying roller 49 rotates with a predetermined tying and guides the image receiving sheet 73 to the developing position P2.

A paper discharge tray 57 is attached to the lower side of one side of the copying machine main body 1 . Rollers 50 and 56 and a glossing device 51 are provided between the development position P2 and the paper discharge tray 57. The image receiving sheet 73 that has passed through the development position iP2 is heated by the glossing device 51. The surface of the image receiving sheet 73 is coated with a thermoplastic resin together with a developing material, and this thermoplastic resin is melted by heating from the glossing device 51 to give gloss to the image. The image receiving sheet 73 that has passed through the glossing device 51 is discharged onto a paper discharge tray 57 by a roller 56.

When copying an image of a document placed on the document table 2 in the copying machine configured as described above, first, the base 1) is exposed in an exposure step. 12 moves forward in the direction of arrow C, and the image of the original is scanned by the copy lamp 3.4. The light reflected from the original by the copy lamps 3 and 4 has an exposure value iP.
1, light is distributed onto the media sheet 25, and a selectively cured image is formed on the media sheet 25-1. In this exposure process, the pressure rollers 46 and 47 do not rotate, and the buffer roller 43 moves in the direction of arrow A.

The media sheet 25 is pulled out from the cartridge 20 by the movement of the buffer roller 43.

When the copy lamp 3.4 reaches the document end position, the base 1). 12 moves back in the direction of the arrow. At the same time, the pressure rollers 46 and 47 start rotating, and further, the timing roller 49 starts rotating at a predetermined timing. As a result, the leading edge position of the selectively cured image on the media sheet 25 and the leading edge position of the image receiving sheet 73 match, and the developing position P2
guided by. At this time, the rotation of the supply shaft 24 is restricted, and the rotation of the pressure rollers 46 and 47 causes the buffer roller 43 to move in the direction of arrow B. In this way, the "C image receiving sheet 73 is placed on the media sheet 25 at the development position P2.
It is also pressurized. This pressurization destroys the uncured microcapsules of the media sheet 25-1, and the leuco dye contained therein leaks onto the image-receiving sheet 73, causing a coloring reaction with the acid to form an image on the image-receiving sheet 73. can.

FIG. 2 is a diagram showing the configuration of a main part of an optical system device that constitutes a part of the copying machine.

Each of the copy lamps 3.4 constituted by a halogen lamp is housed in the beam flap 16.1.

A part of this reflector 16.17 has a slit 16a,
17a is formed.

Furthermore, filters 18.19 for absorbing heat rays are provided at the openings of the reflectors 16.17.

This reflector 16, 17 is open at both longitudinal ends. A cooling fan 10 that is pivotally supported within a cover 10a is provided near the reflector 17 that houses one of the copy lamps 4. A guide 15 is provided between the cooling fan 10 and the reflector 17. , the air sent out from the cooling fan 10 is guided in the directions of arrows E and F. Air guided in the direction of arrow E from the cooling fan 10 comes into contact with the lower surface of the document table (not shown) located above the copy lamps 3 and 4, and air guided in the direction of arrow F enters the reflector 17 through the slit 17a. . Further, air flowing into the reflector 16 from both ends in the longitudinal direction is exhausted in the direction of arrow G from the sulin l-16a by the exhaust port fan 14.

FIG. 4 is a perspective view showing the flow of air in the vicinity of the document table of the copying machine.

As shown in the figure, outside air introduced from an intake port 20 provided on the back side of the copying machine main body 1 flows into the cooling fan 10 from both longitudinal ends thereof and flows out from its circumferential surface.

A portion of the air flowing out from the cooling fan 10 is guided to the lower surface of the document table 2 by the aforementioned guide 5, and the rest is guided into the flap 1f. Since the reflector 17 is provided with the above-mentioned filter 19, most of the air flowing into the reflector 17 flows out from both ends in the longitudinal direction. In addition, part of the outside air introduced from the intake port 20 is transferred to the flefter 1.
6 flows into the riffle 16 from both ends in the longitudinal direction,
It flows out from the slit. In the above manner, the intake port 20
The outside air introduced from ■ the cooling fan 10 to the manuscript table 2
After passing through the lower surface of (1) the cooling fan 10 to the reflector 17, and (2) the reflector 16, it is discharged to the outside by the exhaust port fan 14.

FIG. 5 is a plan view showing the driving mechanism of the main parts of the optical system device.

A lifter 1617 for storing the copy lamps 3 and 4 is mounted on the base 1). Further, the fan 10 is housed in a case 10a together with a fan motor M2.

A wire 21 is attached to the base 1) and one end of the case 10a.
A part of each is fixed. This wire 21 is stretched around a pulley (not shown), and the optical system motor Ml (not shown) rotates via this pulley and wire 21 to the base 1 and the case loa via a clutch (described later).
is transmitted to. That is, when the optical system motor Ml rotates, the wire 21 moves, and this movement causes the case 10a to move.
and the base 1) is the guide 23 of the rollers 22a, 22b.
Move by rotating above. As is clear from the figure, the case 10a is not fixed to the base 1), and the vibrations generated by the rotation of the fan motor M2 are not directly transmitted to the base 1). Therefore, the copy lamps 3, 4 and 5 mounted on the base 1) do not vibrate during the exposure process, and the light from the copy lamps 3.4 can be accurately distributed to the exposure position. .

FIG. 6 is a block diagram of the control section of the L optical distribution system device.

A one-chip microcomputer 61 includes a lamp driver 62, a motor driver 63, and a clutch driver 6.
4 is connected. The lamp driver 62 controls the lighting of the copy lamps 3 and 4, and the motor 63 is an optical system motor M1.
and drives fan motor M2. Clutch driver 64 selectively drives mirror feed clutch CLTI and mirror return clutch CLT2. Further, the temperature detected by the thermistor Th disposed below the document table is inputted to the microcomputer 61.

The microcomputer 61 turns on/off the motors M1, M2, copy lamp 3.4, and other operating parts of the copy cycle system in response to input from the thermistor Th.

FIG. 1 is a flowchart showing the processing procedure of the control section of the optical system device.

When the copying process is started, the temperature of the thermistor Th is detected and stored in t (nl→n2). Then, this detected temperature t is compared with a preset base temperature T, and when the detected temperature, that is, the temperature near the document table 2 is on the verge of overheating, the copying process is temporarily interrupted and the copy lamp 3.4 is turned off. In this state, the cooling fan 10 is moved to the final end of the scanning length at that time and activated (n3→n4→n5→n6).

For example, if the size of the interrupted copy process is A4, the cooling fan 10 is moved to the right end position of the A4 size and activated to cool the document table 2 and the copy lamps 3 and 4. When the value detected by the thermistor Th becomes equal to or less than the predetermined value T, the process returns to the copy cycle and continues the copy process (n7→n
8→n9→n10). Note that if the point in time when overheating is detected is during a single copy process such as an exposure process, the process is interrupted when the copy process is completed.

(0) Effects of the Invention As described above, according to this invention, the actual temperature in the vicinity of the document table is detected, and if the detected value is on the verge of overheating, the copying process is temporarily interrupted and cooling is performed intensively. , the temperature does not rise excessively even during continuous copying, etc. Therefore, handling of the original is easy and shortening of the life of the copy lamp can be prevented.

[Brief explanation of the drawing]

FIG. 1 is a flowchart showing the main processing procedure of a copying machine according to an embodiment of the present invention, FIG. 2 is a diagram showing the configuration near the cooling fan, and FIG. 3 is a schematic front view showing the configuration of the copying machine.
Fig. 4 is a perspective view showing the state of air circulation near the optical device of the same copying machine, 5 Fig. 5 is a diagram showing the driving mechanism of the main part of the optical system of the same copying machine, and Fig. 6 is a perspective view of the same copying machine. FIG. 3 is a block diagram of a control section of the optical system device of the machine. 1-Copy machine body, 2-Original table, 3.4-Copy lamp,
10-cooling fan, 14-exhaust fan, 20-intake port.

Claims (1)

[Claims] (1) A document table on which a document to be copied is placed, a copy lamp that is movable with respect to the home position on the bottom surface of the document table, and a cooling fan that moves with the copy lamp and blows air toward the home position. A copying machine equipped with a sensor that detects the temperature near the document table, and when the temperature detected by this sensor exceeds a predetermined value, the copying process is interrupted and the cooling fan is moved to the end of the scanning width of the previous copying process. What is claimed is: 1. A copying machine equipped with a cooling fan, comprising: a means for stopping and operating the copying machine near a position; and a cooling fan.