JPH07159908A - Image forming device - Google Patents

Abstract

PURPOSE:To surely prevent the temp. rising of an original platen even in the case of continuously using the device by providing a wind-direction switching means for switching the direction of a cooling air flowing along the original platen. CONSTITUTION:A blower 61 being an air-stream generating means is provided on an almost central part in a horizontal direction from the rear side of a unit main body 60 for a scanning system optical device 21, and air F is made to flow along the rear side of a platen glass 3 so as to prevent the temp. rising of the platen glass 3 caused by the heat generation by an exposure lamp. Also, the wind-direction switching means 70 for switching the direction of the cooling air F is provided in the blowing port of the blower 61, that is, the delivery port of a casing. The means 70 is constituted of plural wind-direction boards 71 which are separately installed and can be rocked, a wind-direction board holder 72 being movable member connected with the free-end of the wind- direction board 71 and a holder moving mechanism 73 for changing the direction of the wind-direction board 71.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming apparatus such as an electrophotographic copying machine or a digital copying machine, and more specifically, to moving a scanning unit equipped with a light source along the lower surface of a document table. The present invention relates to an image forming apparatus including a scanning optical device that scans a document placed on a document placing table.

[0002]

2. Description of the Related Art Generally, an image forming apparatus equipped with a scanning optical device is constructed so that air (hereinafter referred to as cooling air) flows along a document table, and heat of a light source such as an exposure lamp is generated. The temperature of the document placing table is prevented from rising due to the above.

Conventionally, there are mainly the following two types of cooling methods for the document placing table. That is, an air flow generating means using a cross flow fan, an axial fan or the like is used as a blower source or a suction source, and (a) a method of sucking air from the outside of the apparatus to the inside of the apparatus (b) sucking air from the inside of the apparatus There is a method of discharging to the outside of the device. However, in any of the methods, the wind direction plate that guides the cooling air flowing along the document placing table is fixed, and the wind direction is always constant.

[0004]

As described above, conventionally, despite the movement of the scanning unit in which the light source (heat source) is mounted, the wind direction of the cooling air for preventing the temperature rise of the document mounting table is always constant. Since it was constant, there were the following problems.

That is, in the document mounting table, the cooling air does not always flow efficiently through the scanning unit portion, even though the portion facing the scanning unit on which the light source (heat source) is mounted is heated most. , The cooling efficiency of the original placing table is poor, and a sufficient cooling effect cannot be obtained especially during continuous use,
There is a problem in that the document placing table may become hot and make the user feel uneasy.

The present invention has been made in view of the above circumstances. An object of the present invention is to provide a scanning type optical device for scanning a document by moving a scanning unit having a light source mounted thereon. An object of the present invention is to provide an image forming apparatus capable of surely preventing a temperature rise of the document placing table even in use.

[0007]

As a first means for achieving the above object, the present invention irradiates an original placing table for placing an original and an original placed on the original placing table. A scanning optical device that scans the original by moving a scanning unit equipped with a light source along the lower surface of the original placing table, and the original heated by heat generation of the light source of the scanning optical device. An air flow generating means for generating an air flow so that the cooling air flows along the mounting table, and an air flow direction switching means for switching the flow direction of the cooling air composed of the air flow generated by the air flow generating means are provided. It is configured.

As a second means, an original placing table for placing an original and a scanning unit equipped with a light source for illuminating the original placed on the original placing table are provided on the lower surface of the original placing table. A scanning optical device that scans the original by moving the original along with the scanning optical device, and an air flow so that cooling air flows along the original mounting table that is heated by the heat generation of the light source of the scanning optical device. Air flow generating means for generating,
The airflow generating means is provided with an airflow direction switching means for switching the cooling airflow consisting of the airflow to follow the moving direction of the scanning unit so that the cooling air is directed to the scanning unit.

As a third means, an original placing table for placing an original and a scanning unit equipped with a light source for illuminating the original placed on the original placing table are provided on the lower surface of the original placing table. A scanning optical device for scanning the document by moving the document along with the inputting device, input means for inputting image forming conditions such as the size of the document scanned by the scanning optical device, image forming magnification, and the like; Means for changing the moving distance and speed of the scanning unit according to the image forming condition input by the device, and a cooling air flow along the document mounting table heated by the heat generation of the light source of the scanning optical device. The air flow generating means for generating the air flow and the moving distance and speed of the scanning unit are adjusted so that the flow direction of the cooling air composed of the air flow generated by the air flow generating means faces the scanning unit. It is obtained by the then formed by and a wind direction switching means for switching a configuration.

As a fourth means, a scanning unit equipped with an original placing table for placing an original and a light source for illuminating the original placed on the original placing table is provided on the lower surface of the original placing table. A scanning optical device that scans the original by moving the original along with the scanning optical device, and an air flow so that cooling air flows along the original mounting table that is heated by the heat generation of the light source of the scanning optical device. Air flow generating means for generating,
An air flow direction switching device for switching the flow direction of the cooling air composed of the air flow generated by the air flow generating device, wherein the air flow direction switching device is provided with a plurality of air flow direction plates which are spaced from each other and swingably provided. A movable member which is provided so as to be slidable along the arrangement direction of the wind direction plates and to which the free end side of the wind direction plates is connected; and a movable member moving means for changing the direction of the wind direction plates by moving the movable member. It is configured to include and.

[0011]

According to the image forming apparatus of the first means of the present invention,
Since the wind direction switching means for switching the flow direction of the cooling air flowing along the document placing table is provided, it is possible to efficiently cool the part of the document placing table where the temperature is most likely to rise, and the document placing table of the document placing table can be efficiently used even in continuous use. It is possible to reliably prevent the temperature rise.

Further, according to the image forming apparatus of the second means, the flow direction of the cooling air flowing along the document placing table is switched so as to follow the moving direction of the scanning unit so as to be directed to the scanning unit equipped with the light source. Since the wind direction switching means is provided, it is possible to always cool the portion where the temperature is most likely to rise, and it is possible to more reliably prevent the temperature of the document placing table from rising even during continuous use.

Further, according to the image forming apparatus of the third means, the wind direction switching means for switching the flow direction of the cooling air to follow the moving distance and speed of the scanning unit is provided so that the cooling air flows toward the scanning unit. Even if the image forming conditions such as size and image forming magnification change, it is possible to always cool the part that is most likely to rise in temperature, and it is possible to more reliably prevent the temperature of the document table from rising even during continuous use. It will be possible.

Further, according to the image forming apparatus of the fourth means, the wind direction switching means is slidable along a plurality of wind direction plates which are spaced from each other and are swingable, and the arrangement direction of these wind direction plates. Since the movable member is provided so as to be movable and the free end side of the wind direction plate is connected, and the movable member moving means for changing the direction of the wind direction plate by moving the movable member, The wind direction can be reliably changed with a simple mechanism.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below in detail with reference to FIGS. FIG. 1 schematically shows a configuration of an electrophotographic copying apparatus 1 as an image forming apparatus of the present invention. On an upper surface of an apparatus main body 2, a platen glass 3 as a document placing table is provided. Further, on the upper surface of the apparatus main body 2, the document A placed on the platen glass 3 is placed.
An original pressing cover 4 for pressing is attached rotatably, and a control panel 9 (see FIG. 5) as an input / display means is arranged along the front edge portion.

On the right side of the apparatus main body 2, there are mounted a paper feed cassette 6 having a top cover that also serves as a manual guide 5 and a large-capacity paper feeder 7, and on the left side of the apparatus main body 2, a copy is provided. The receiver 8 is attached.

Further, in the main body 2 of the apparatus, an image is formed on the paper P automatically fed from the paper feed cassette 6 or the large-capacity paper feed device 7 or the paper P manually fed through the manual feed guide 5. An image forming means 10 for forming and ejecting the paper to the copy receiver 8 is housed.

The image forming means 10 has the following structure. That is, the photoconductor drum 11 as an image bearing member is rotatably provided in a substantially central portion of the apparatus main body 2. Around the photoconductor drum 11, along the rotation direction (arrow direction), the charging charger 12, LE is installed.
D erasing array 13, developing device 14, pre-transfer charge eliminating lamp 1
5, a transfer charger 16, a peeling charger 17, a peeling claw 18, a cleaning device 19, and a charge eliminating lamp 20 are sequentially arranged. Furthermore, in the upper part inside the device main body 2,
A scanning optical device (exposure device) 21, which will be described later, is provided between the LED erasing array 13 and the developing device 14 for scanning the image information of the document A set on the document table 3. .

Further, in the main body 2 of the apparatus, a sheet of paper automatically fed from the sheet feeding cassette 6 or the large-capacity sheet feeding apparatus 7 or a sheet of paper P which is manually fed through the manual feeding guide 5
A sheet conveying path 25 is formed to guide the sheet to the copy receiver 8 via the image transfer section 24 between the transfer charger 16 and the photosensitive drum 11.

A pair of registration rollers 26 as an aligning unit is located upstream of the image transfer unit 24 in the sheet conveying path 25, and a fixing device 27 is located downstream of the image transfer unit 24. The gate 28 and the discharge roller pair 29 are arranged.

A double-sided image forming transporting device (ADD) 30 is provided in the lower part of the apparatus main body 2, and the sheet P on which one-sided image is formed is switched by switching the gate 28 as needed. After being guided to the carrying device 30 and accumulated once, they are sequentially taken out one by one and fed again to the image transfer portion 24.

A scanning optical device (exposure device) 21 is provided in the upper part of the apparatus main body 1. The exposure device 21 illuminates the document A set on the platen glass 3 provided on the upper surface of the device main body 2 with an exposure lamp 41 which is a light source surrounded by a reflector 40 and reflects light reflected from the document surface. The first mirror 42, the second mirror 43,
The light passing through the lens 45 is guided to the lens 45 through the third mirror 44 in order, and further, the light transmitted through the lens 45 is passed through the fourth mirror 46, the fifth mirror 47, and the sixth mirror 48 to the photosensitive drum 11. It is designed to guide you.

The exposure lamp 41 and the first mirror 4
A scanning unit 51 is mounted on a first carriage 50 which can reciprocate along the lower surface of the platen glass 3. The scanning unit 51 includes a slit 52 for transmitting light.
It is in a state of being covered with a cover 52 having A.

The second mirror 33 and the third mirror 34 are mounted on the second carriage 53 which moves in the same direction at half the speed of the first carriage 50. The lens 45, the fourth mirror 46, and the fifth mirror 47 move to predetermined positions according to the setting of the copy magnification from the control panel 9.

When copying the original A, the photosensitive drum 11 rotates in the direction of the arrow and is uniformly charged by the charging device 12. Then, the scanning optical device (exposure device) 2 is formed on the uniformly charged photosensitive drum 11.
The document A is scanned by 1 and slit exposure is performed on the photosensitive drum 11. Then, the document A is placed on the photosensitive drum 11.
An electrostatic latent image corresponding to is formed.

That is, the exposure lamp 41 of the scanning unit 51 in which the exposure lamp 41 as the light source and the first mirror 42 are mounted on the first carriage 50 is turned on, and then the scanning unit 51 of the platen glass 3 is turned on. Along the bottom surface, in the state of FIG.
Direction). At this time, the second carriage 53 mounting the second mirror 33 and the third mirror 34 is
The carriage 50 moves in the same direction at half the speed. Then, the document A set on the platen glass 3 is sequentially illuminated, and the reflected light is guided to the photosensitive drum 11 and slit exposure is performed.

The electrostatic latent image formed on the photoconductor drum 11 is developed by applying a powder developer (toner) by the developing device 14, and a developer image (hereinafter, referred to as a developer image) on the photoconductor drum 11 is developed.
A toner image) is formed.

On the other hand, in synchronism with the operation of forming a toner image on the photosensitive drum 11, the paper P is sent to the image transfer section 24 via the pair of registration rollers 26, and the transfer charger 16 acts to cause the photosensitive drum 11 to operate. The upper toner image is transferred to the paper P.

Then, the paper P on which the toner image is transferred is
After being peeled by the peeling charger 17 by AC corona discharge, it is guided to the fixing device 27 via the conveying device 23,
The toner image is fused and fixed on the paper P by the fixing device 27. After that, the paper P is discharged onto the copy receiver 8 by the paper discharge roller pair 29. Alternatively, by switching the gate 28 as needed, the paper P on which one-sided image has been formed is guided to the double-sided image forming conveyance device (ADD) 30 and temporarily accumulated, and then sequentially taken out one by one to perform double-sided copying. The image is sent again to the image transfer unit 24.

After the toner image is transferred onto the paper P, the cleaning device 19 removes the residual toner from the photosensitive drum 11, and the static elimination lamp 20 removes the residual charge, so that the photosensitive drum 11 becomes clean. Enables copying operation.

Further, in the electrophotographic copying apparatus 1, as shown in FIG. 2, an air flow generating means is provided at the rear side of the unit main body 60 of the scanning optical device 21 and substantially in the center in the left-right direction. An air blower 61 is provided, and as shown in FIGS. 2 and 3, air (hereinafter referred to as cooling air) F is configured to flow along the lower surface of the platen glass 3 and is accompanied by heat generation of the exposure lamp 41. The temperature of the platen glass 3 is prevented from rising.

As shown in FIGS. 3 and 4, the blower device 61 includes a casing 62, and a crossflow fan or a shaft as a blower source provided in the casing 62 and driven by a fan motor 63. And a fan 64 such as a flow fan.

In addition, at the air outlet of the air blower 61, that is, at the discharge port 62A of the casing 62, the cooling air F is discharged.
There is provided wind direction switching means 70 for switching the flow direction. As shown in detail in FIGS. 3 to 5, the wind direction switching means 70 includes a plurality of wind direction plates 71, which are spaced from each other and are swingable, and along the arrangement direction of the wind direction plates 71. The wind direction plate holder 72 is provided as a movable member that is slidably movable and is connected to the free end side of the wind direction plates 71, and a movable member that changes the direction of the wind direction plates 71 by moving the wind direction plate holder 72. It comprises a holder moving mechanism 73 as moving means.

Each of the wind direction plates 71 is arranged in a casing 62 in a standing position and has a front end portion protruding from the discharge port 62A, and shafts 71A projecting from the rear end of the upper end surface and the rear end of the lower end surface, respectively. , 71A are rotatably pivoted by engaging holes 71A formed in the casing 62.

Further, shafts 71B, which are respectively provided on the front end of the upper end surface and the front end of the lower end surface, which are the free end side of the wind direction plate 71,
71B is in a state of being engaged with the long holes 74 formed in the pair of upper and lower support bars 72A and 72B forming the wind direction plate holder 72.

The support bars 72A and 72B are connected to each other by a connecting member (not shown) and are slidably supported by a guide member (not shown), and the right direction (direction of arrow B) which is the scanning direction of the scanning unit 51.
Then, it is possible to move along the left direction (direction of arrow C) which is the return direction.

The holder moving mechanism 73 comprises a pinion 76 driven by a motor 75 as a wind direction plate drive source, and a rack 77 provided on the lower support bar 72B meshing with the pinion 76.

When the pinion 76 is rotated clockwise in the state shown in FIG. 5 to move the wind direction plate holder 72 to the right, all the wind direction plates 71 ... Are rotated counterclockwise with the shaft 71A as a pivot. The airflow direction of the cooling air F changes to the right direction (direction of arrow B) which is the scanning direction of the scanning unit 51. On the contrary, when the pinion 76 is rotated counterclockwise in the state of FIG. 5 to move the wind direction plate holder 72 to the left, all the wind direction plates 71 ... Are rotated clockwise with the shaft 71A as the fulcrum. The rotational direction of the cooling air F is
The scanning unit 51 is configured to change in the left direction (direction of arrow C) which is the returning direction of the scanning unit 51.

The moving means of the scanning unit 51 has the following structure. That is, as shown in FIG. 2, the scanning unit 51 includes an endless scanning unit drive belt 82 stretched around the pulleys 80 and 81.
It is in a state of being connected to the through the connecting member 83.

Further, the pulley 8 is integrated with the pulley 80.
4 is provided, and the scan motor 85 is attached to the pulley 84.
Is linked with a pulley 86 driven by a timing belt 87.

The scanning unit drive belt 82 travels with the forward and reverse rotations of the scan motor 85, so that the scanning unit 51 moves in a predetermined direction.

FIG. 7 shows a control system relating to the wind direction operation of the wind direction switching means 70, and the CPU 9 which is the control means.
Reference numeral 0 indicates a scan motor 85 which is a driving source of the scanning unit 51, and a lamp driver 9 which controls ON / OFF of an exposure lamp 41 which is a light source mounted on the scanning unit 51.
1, a fan motor 63 that drives a fan 64 that is a blower source of the blower 61, a wind direction plate drive source for changing the direction of the wind direction plate 71, that is, the motor 75 of the holder moving mechanism 73, and the scanning unit 51. A control panel 9 is connected as an input / display means for inputting image forming conditions such as the size of the document A to be scanned and image forming magnification and displaying necessary information.

When the pudding button is pressed after the image forming conditions are input in advance by the control panel 9, the image forming operation is performed by the image forming means 10.
At this time, the scanning unit 51 of the scanning optical device 21.
In response to a command from the CPU 90, moves in the direction of arrow B in the state shown in FIGS. 2 and 6 at a predetermined speed and at a predetermined distance in accordance with the size of the document A while the exposure lamp 41 is turned on. Then, the document A is scanned and slit exposure is performed on the photosensitive drum 11.

On the other hand, at this time, the fan motor 63 of the air blower 61 is driven in advance by a command from the CPU 90 to be in the air blowing state, and the rotation direction and time of the motor 75 of the holder moving mechanism 73 constituting the airflow direction switching means 70 are set. , The speed, etc. are controlled.

As a result, the cooling air F is generated by the cooling air F shown in FIGS.
As shown in, the direction of the wind direction plates 71 ... Is switched along the lower surface of the platen glass 3 and so as to follow the moving direction of the scanning unit 51 so as to face the scanning unit 51.

The cooling air F flowing toward the scanning unit 51 along the lower surface of the platen glass 3 causes the temperature of the platen glass 3 to rise most easily as the exposure lamp 41 heats and the scanning unit 51. It can always cool itself.

Therefore, even during continuous copying,
It is possible to reliably prevent the temperature of the platen glass 3 from rising and prevent the user from feeling uneasy. Further, since the airflow direction switching means 70 is provided, the cooling efficiency is improved, so that the maximum value of the temperature rise can be suppressed to be lower than the conventional value.

Next, a second embodiment of the present invention will be described in detail with reference to FIGS. The same parts as those in the above-described embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

In this embodiment, a solenoid is used as a wind direction plate drive source. That is, the solenoid 95 is attached to one end of the support bar 72B below the wind direction plate holder 72.
The plunger 95A is connected to the other end, and the other end is connected to a tension spring 97 hooked on the frame 96 on the opposite side.

When the solenoid 95 is ON, the wind direction plate holder 72 moves to the left in the figure (direction of arrow C), and
When the solenoid 95 is OFF, the wind direction plate holder 72 moves to the right in the figure (direction of arrow B). As a result, the inclination of the wind direction plates 71 changes, and the direction of the cooling air F changes.
Further, the ON / OFF control of the solenoid 95 is performed by the CPU 9
A command from 0 can be switched according to the movement status of the scanning unit 51.

Next, a third embodiment of the present invention will be described with reference to FIG.
It will be described in detail with reference to FIGS. The same parts as those in the above-described embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

In this embodiment, a scan motor 85 for driving the scan unit drive belt 82 is used as a wind direction plate drive source. That is, the pinion 1 that engages the driving force of the scan motor 85 with the rack 103 provided on the support bar 72B below the wind direction plate holder 72 via the gear train including the gears 100, 101, and 102.
It is configured to be transmitted to 04.

When the scanning unit 51 moves rightward in the drawing (direction of arrow B) as the scan motor 85 is driven, the wind direction plate holder 72 also moves rightward, and the scanning unit 51 moves leftward (in the drawing). When moving in the direction of arrow C), the wind direction plate holder 72 also moves to the left, so that the wind direction always faces the scanning unit 51.

Next, a fourth embodiment of the present invention will be described with reference to FIG.
It will be described in detail with reference to FIGS. The same parts as those in the above-described embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

In this embodiment, the traveling of the scanning unit drive belt 82 is used as the wind direction plate drive source. That is, the spring holder 110 fixed to the scanning unit drive belt 82 has one end hooked to the other end of the spring 111, and the other end of the support bar 72 below the wind direction plate holder 72.
It is hooked on the spring holder 112 provided at B.

When the scanning unit 51 is in the right direction (direction of arrow B) in the figure, the wind direction plate holder 72 is also in the right direction, and when the scanning unit 51 is in the left direction (direction of arrow C), the wind direction. The plate holder 72 is also leftward so that the wind direction is toward the scanning unit 51.

In the description of each of the above-mentioned embodiments, the blower 61 is used as the air flow generating means so that the cooling air F flows toward the scanning unit 51, but the suction means is used as the air flow generating means. The cooling air F used may flow from the scanning unit 51 direction. In addition, the present invention is not limited to the above-described embodiment, and it goes without saying that various modifications can be made without departing from the spirit of the present invention.

[0058]

As described above, the device of the present invention has the following effects. According to the image forming apparatus of the first aspect, since the air flow direction switching means for switching the flow direction of the cooling air flowing along the document placing table is provided, the portion of the document placing table where the temperature is most likely to rise is efficiently cooled. It is possible to prevent the temperature rise of the document placing table even in continuous use.

Further, according to the image forming apparatus of the second aspect, the flow direction of the cooling air flowing along the document placing table is switched so as to follow the moving direction of the scanning unit so as to be directed to the scanning unit equipped with the light source. Since the wind direction switching means is provided, it is possible to always cool the portion where the temperature is most likely to rise, and it is possible to more reliably prevent the temperature rise of the document placing table even during continuous use.

Further, according to the image forming apparatus of the third aspect, since the air flow direction switching means is provided for switching the flow direction of the cooling air toward the scanning unit so as to follow the moving distance and speed of the scanning unit. Even if the image forming conditions such as size and image forming magnification change, it is possible to always cool the part that is most likely to rise in temperature, and it is possible to more reliably prevent the temperature of the document table from rising even during continuous use. it can.

Further, according to the image forming apparatus of the fourth aspect, the wind direction switching means is slidable along the arrangement direction of the wind direction plates and the plurality of wind direction plates which are spaced from each other and are swingable. Since the movable member is provided so as to be movable and the free end side of the wind direction plate is connected, and the movable member moving means for changing the direction of the wind direction plate by moving the movable member, The wind direction can be reliably changed with a simple mechanism.

[Brief description of drawings]

FIG. 1 is a front sectional view schematically showing the overall configuration of an image forming apparatus that is a first embodiment of the present invention.

FIG. 2 is a schematic perspective view showing a configuration of a scanning optical device of the same embodiment.

FIG. 3 is a schematic side sectional view of a main part of the scanning optical device.

FIG. 4 is a schematic plan view of the main part of the scanning optical device.

FIG. 5 is a schematic front view of the main part of the scanning optical device.

FIG. 6 is an explanatory diagram similarly illustrating the operation of the main part of the scanning optical device.

FIG. 7 is a block diagram showing a control system relating to the wind direction operation of the wind direction switching means, which is the main part.

FIG. 8 is a schematic perspective view showing a configuration of a scanning optical device according to a second embodiment of the present invention.

FIG. 9 is a schematic plan view of the main part of the scanning optical device.

FIG. 10 is a schematic front view of the main part of the scanning optical device.

FIG. 11 is a schematic perspective view showing a configuration of a scanning optical device according to a third embodiment of the present invention.

FIG. 12 is a schematic plan view of the main part of the scanning optical device.

FIG. 13 is a schematic front view of the main part of the scanning optical device.

FIG. 14 is a schematic perspective view showing the configuration of a scanning optical device according to a fourth embodiment of the present invention.

FIG. 15 is a schematic plan view of the main part of the scanning optical device.

FIG. 16 is a schematic front view of the main part of the scanning optical device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Electrophotographic copying apparatus (image forming apparatus), 2 ... Device body, 3 ... Platen glass (original table), 21 ... Scanning optical device (exposure device), 41 ... Exposure lamp (light source), 5
DESCRIPTION OF SYMBOLS 1 ... Scan unit, 61 ... Blower (air flow generation means), 64 ... Fan (blower source), 70 ... Wind direction switching means, 72 ... Wind direction plate holder (movable member), 72A, 72B
... Support bar, 73 ... Holder moving mechanism (movable member moving means), 71 ... Airflow direction plate, F ... Cooling air.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location H04N 1/10 1/107

Claims (4)

[Claims] 1. A document placing table for placing a document and a scanning unit equipped with a light source for illuminating the document placed on the document placing table are moved along a lower surface of the document placing table. A scanning optical device for scanning the original document with an air flow, and an air flow generating means for generating an air flow so that cooling air flows along the original document placement table heated by the heat generation of the light source of the scanning optical device. An image forming apparatus comprising: an air flow direction switching unit that switches a flow direction of a cooling wind formed of an air flow generated by the air flow generation unit. 2. A document placing table for placing a document and a scanning unit equipped with a light source for illuminating the document placed on the document placing table are moved along a lower surface of the document placing table. A scanning optical device for scanning the original document with an air flow, and an air flow generating means for generating an air flow so that cooling air flows along the original document placement table heated by the heat generation of the light source of the scanning optical device. And a wind direction switching means for switching the flow direction of the cooling air including the air flow generated by the air flow generating means so as to be directed to the scanning unit by following the moving direction of the scanning unit. Image forming apparatus. 3. A document placing table for placing a document and a scanning unit equipped with a light source for illuminating the document placed on the document placing table are moved along a lower surface of the document placing table. A scanning type optical device for scanning the document by means of an input device, an input means for inputting image forming conditions such as the size of the document and an image forming magnification to be scanned by the scanning type optical device, and an image forming device inputted by the input means. Means for changing the moving distance and speed of the scanning unit depending on conditions, and air for generating an air flow so that cooling air flows along the document placing table heated by the heat generation of the light source of the scanning optical device. A wind direction switch that switches the flow direction of the cooling air including the air flow generating means and the air flow generated by the air flow generating means so as to follow the moving distance and speed of the scanning unit. An image forming apparatus characterized by being provided example the means. 4. A document placing table for placing a document and a scanning unit equipped with a light source for illuminating the document placed on the document placing table are moved along a lower surface of the document placing table. A scanning optical device for scanning the original document with an air flow, and an air flow generating means for generating an air flow so that cooling air flows along the original document placement table heated by the heat generation of the light source of the scanning optical device. And a wind direction switching means for switching the flow direction of the cooling air made of the air flow generated by the air flow generating means, wherein the wind direction switching means are provided in a state of being separated from each other and swingably provided. The wind direction plate, a movable member slidably provided along the arrangement direction of the wind direction plates and connected to the free end side of the wind direction plates, and the direction of the wind direction plates can be changed by moving the movable member. An image forming apparatus comprising: a movable member moving unit that changes.