JP5831001B2 - Image forming apparatus - Google Patents

Description

  The present invention relates to an image forming apparatus, and more particularly to an image forming apparatus that develops an electrostatic latent image with toner.

  As a conventional image forming apparatus, for example, an image forming apparatus described in Patent Document 1 is known. The image forming apparatus includes a suction duct that sucks air containing scattered toner in a case that accommodates the toner image forming apparatus, a fan that is disposed in the suction duct, and an upstream side of the suction fan to remove the toner. A suction duct device having a filter is provided. The clean air that has passed through the filter is guided around a predetermined member. Thereby, a predetermined member is cooled.

  However, in the image forming apparatus described in Patent Document 1, it is difficult to obtain a sufficient cooling effect. More specifically, the suction duct sucks air containing scattered toner from inside the case. A toner image forming device, a fixing device, and the like are accommodated in the case and are in a relatively high temperature state. Therefore, the air sucked by the suction duct is relatively high temperature. Even if such high-temperature air is guided to the predetermined member, the predetermined member is not sufficiently cooled.

JP 2002-116670 A

  Accordingly, an object of the present invention is to provide an image forming apparatus capable of sufficiently cooling a predetermined member.

An image forming apparatus according to an aspect of the present invention includes a main body, a cylindrical photoconductor provided in the main body and extending in a predetermined direction , provided in the main body, and toner on the photoconductor. a developing device for imparting comprises a cooling device for cooling a predetermined member, the cooling device is a suction hole for sucking the air containing scattered toner generated in the photosensitive member or the developing device A first duct provided with two suction holes provided to face both ends of the photoconductor in the predetermined direction; a second duct connected to the first duct; A filter provided in the second duct and configured to remove the scattered toner from the air; and provided in a downstream side of the filter in the second duct, and the first duct and the second duct. Air flow is generated inside A suction section for sucking air from outside the main body, and upstream of the blower means of the second duct, and the second duct by the blower means. The air discharged from the duct is guided to the predetermined member.

  According to the present invention, the predetermined member can be sufficiently cooled.

1 is a diagram illustrating an overall configuration of an image forming apparatus. It is a conceptual diagram of a cooling device. 1 is an external perspective view of a developing device. It is the figure which showed the outline | summary of the cooling device. It is a perspective view of a duct. It is a perspective view of a duct, a filter, and a sirocco fan. It is sectional structure drawing of a duct, a filter, and a sirocco fan. 1 is a perspective view of an image forming apparatus. It is the graph which showed the relationship between the air volume and static pressure of a sirocco fan and an axial fan. It is the figure which showed the simulation result by the 1st model. It is the figure which showed the simulation result by the 2nd model.

  Hereinafter, an image forming apparatus according to an embodiment of the present invention will be described with reference to the drawings.

(Configuration of image forming apparatus)
Hereinafter, an image forming apparatus including a developing device according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a diagram illustrating an overall configuration of the image forming apparatus 1. 1 is defined as the z-axis direction, the left-right direction in FIG. 1 is defined as the x-axis direction, and the front-rear direction in FIG. 1 is defined as the y-axis direction.

  The image forming apparatus 1 is an electrophotographic color printer and is configured to synthesize images of four colors (Y: yellow, M: magenta, C: cyan, K: black) in a so-called tandem system. is there. The image forming apparatus 1 has a function of forming an image on a sheet based on image data read by a scanner. As shown in FIG. 1, a printing unit 2, a main body 3, a paper feeding unit 15, a timing roller pair 19, a fixing device 20, a discharge roller pair 21, a discharge tray 23, and a conveyance path R.

  The main body 3 is a housing of the image forming apparatus 1 and includes a printing unit 2, a paper feeding unit 15, a timing roller pair 19, a fixing device 20, and a paper discharge roller pair 21.

  The paper supply unit 15 serves to supply paper one by one and includes a paper tray 16 and a paper supply roller 17. A plurality of sheets in a state before printing are stacked on the sheet tray 16. The paper feed roller 17 takes out the paper placed on the paper tray 16 one by one. The timing roller pair 19 conveys the paper while adjusting the timing so that the toner image is secondarily transferred to the paper in the printing unit 2.

  The printing unit 2 forms a toner image on the paper supplied from the paper supply unit 15, forms an image forming unit (22Y, 22M, 22C, 22K), an optical scanning device 6 (6Y, 6M, 6C, 6K), and a transfer. A portion 8 (8Y, 8M, 8C, 8K), an intermediate transfer belt 11, a driving roller 12, a driven roller 13, a secondary transfer roller 14, and a cleaning device 18 are included. The image forming units (22Y, 22M, 22C, 22K) include a photosensitive drum 4 (4Y, 4M, 4C, 4K), a charger 5 (5Y, 5M, 5C, 5K), and a developing device 7 (7Y, 7M). , 7C, 7K) and cleaner 9 (9Y, 9M, 9C, 9K).

  The photosensitive drum 4 (4Y, 4M, 4C, 4K) is provided in the main body 3 and has a cylindrical shape. The photosensitive drum 4 is rotated clockwise in FIG. The charger 5 (5Y, 5M, 5C, 5K) charges the peripheral surface of the photosensitive drum 4 (4Y, 4M, 4C, 4K). The optical scanning device 6 (6Y, 6M, 6C, 6K) is controlled by a control unit (not shown) so that the beam B (BY, BY) is applied to the peripheral surface of the photosensitive drum 4 (4Y, 4M, 4C, 4K). BM, BC, BK) are scanned. Thereby, an electrostatic latent image is formed on the peripheral surface of the photosensitive drum 4 (4Y, 4M, 4C, 4K).

  The developing device 7 (7Y, 7M, 7C, 7K) is provided in the main body 3, and applies toner to the photosensitive drum 4 (4Y, 4M, 4C, 4K) to generate a toner image based on the electrostatic latent image. develop. Details of the developing device 7 will be described later.

  The intermediate transfer belt 11 is stretched between the driving roller 12 and the driven roller 13. The toner image developed on the photosensitive drum 4 is primarily transferred to the intermediate transfer belt 11. The transfer unit 8 is disposed so as to face the inner peripheral surface of the intermediate transfer belt 11 and plays a role of primary transfer of the toner image formed on the photosensitive drum 4 to the intermediate transfer belt 11. The cleaner 9 collects the toner remaining on the peripheral surface of the photosensitive drum 4 after the primary transfer. The driving roller 12 is rotated by an intermediate transfer belt driving unit (not shown in FIG. 1), thereby driving the intermediate transfer belt 11 in the direction of arrow α. As a result, the intermediate transfer belt 11 conveys the toner image to the secondary transfer roller 14.

  The secondary transfer roller 14 faces the intermediate transfer belt 11 and has a drum shape. The secondary transfer roller 14 secondarily transfers the toner image carried by the intermediate transfer belt 11 to a sheet passing between the secondary transfer roller 14 and the intermediate transfer belt 11 by applying a transfer voltage. The cleaning device 18 removes the toner remaining on the intermediate transfer belt 11 after the secondary transfer of the toner image onto the paper.

  The sheet on which the toner image is secondarily transferred is conveyed to the fixing device 20. The fixing device 20 fixes the toner image on the paper by performing heat treatment and pressure treatment on the paper. The paper discharge roller pair 21 discharges the paper on which the toner image is fixed. Printed paper is placed on the paper discharge tray 23.

(About the cooling device)
The image forming apparatus 1 further includes a cooling device 100 that cools the photosensitive drum 4 and the developing device 7. The cooling device 100 will be described below with reference to the drawings. FIG. 2 is a conceptual diagram of the cooling device 100. FIG. 3 is an external perspective view of the developing device 7. FIG. 4 is a diagram showing an outline of the cooling device 100. FIG. 4 shows only the configuration related to the photosensitive drum 4K and the developing device 7K in the cooling device 100.

  As shown in FIG. 2, the cooling device 100 includes ducts D1Y, D1M, D1C, D1K, D2Y, D2M, D2C, D2K, D2, D3, a filter 50, and a sirocco fan 52.

  The ducts D1Y, D1M, D1C, and D1K are provided in the developing devices 7Y, 7M, 7C, and 7K, respectively, as shown in FIG. Therefore, the configuration of the developing devices 7Y, 7M, 7C, and 7K will be described below with reference to FIGS. Hereinafter, the developing device 7K will be described as an example. Since the developing devices 7Y, 7M, and 7C have the same configuration as the developing device 7K, description thereof is omitted.

  As shown in FIG. 1, the developing device 7K includes a developing roller 72K, a supply roller 74K, an agitation roller 76K, and an accommodating portion 78K.

  The accommodating portion 78K constitutes the main body of the developing device 7K, accommodates toner, and stores the developing roller 72K, the supply roller 74K, and the stirring roller 76K. The agitation roller 76K agitates the toner in the storage portion 78K and negatively charges it. The supply roller 74K supplies negatively charged toner to the developing roller 72K.

  As shown in FIG. 1, the developing roller 72K is opposed to the photosensitive drum 4K with a predetermined gap, and has a cylindrical shape extending in the y-axis direction. The developing roller 72K is rotated in the same direction as the photosensitive drum 4K (that is, clockwise in FIG. 1). The developing roller 72K having the above-described configuration carries toner on the peripheral surface thereof and is exposed in a rectangular shape from the housing portion 78K as shown in FIGS. The developing roller 72K faces the photosensitive drum 4K at a portion exposed from the housing portion 78K, and applies toner to the photosensitive drum 4K.

  The duct D1K is a triangular cylinder that is attached to the positive side of the developing device 7K in the z-axis direction and extends in the y-axis direction. The duct D1K is adjacent to the developing roller 72K and faces the photosensitive drum 4K. Suction holes H1K and H2K are provided at the end on the positive side in the y-axis direction and the end on the negative direction side of the surface of the duct D1K facing the photosensitive drum 4K. Further, the end on the positive direction side in the y-axis direction of the duct D1K is closed, and the end on the negative direction side in the y-axis direction of the duct D1K is open.

  As shown in FIG. 4, the ducts D2Y, D2M, D2C, and D2K are respectively connected to the ends of the ducts D1Y, D1M, D1C, and D1K on the negative side in the y-axis direction. The duct D2 is connected to the ducts D2Y, D2M, D2C, and D2K as shown in FIGS. More specifically, the duct D2 joins four ducts D2Y, D2M, D2C, and D2K provided in parallel to one flow path.

  The filter 50 is provided in the duct D2. More specifically, the filter 50 is provided on the downstream side of the portion where the duct D2 merges into one flow path. The sirocco fan 52 is provided on the downstream side of the filter 50 in the duct D2 and is a blowing means for generating an air flow in the ducts D1Y, D1M, D1C, D1K, the ducts D2Y, D2M, D2C, D2K, D2. is there.

  The duct D3 is connected to the duct D2 on the upstream side of the sirocco fan 52 and on the downstream side of the filter 50.

  In the cooling device 100 configured as described above, when the sirocco fan 52 is driven, the air around the photosensitive drums 4Y, 4M, 4C, 4K and the developing rollers 72Y, 72M, 72C, 72K is sucked into the suction holes H1Y, The air is sucked into the ducts D1Y, D1M, D1C, and D1K through H2Y, H1M, H2M, H1C, H2C, H1K, and H2K. Here, scattered toner is generated on the photosensitive drums 4Y, 4M, 4C, and 4K and the developing rollers 72Y, 72M, 72C, and 72K. Therefore, the air sucked from the suction holes H1Y, H2Y, H1M, H2M, H1C, H2C, H1K, and H2K contains scattered toner.

  The air sucked by the suction holes H1Y, H2Y, H1M, H2M, H1C, H2C, H1K, and H2K flows into the D2 through the ducts D2Y, D2M, D2C, and D2K. As described above, the filter 50 is provided in the duct D2. Therefore, the filter 50 removes scattered toner from the air passing through the duct D2.

  Further, air outside the main body 3 is sucked into the duct D2 through the duct D3. Thereby, the air that has passed through the filter 50 and the air sucked from the duct D3 merge. Then, the air that has passed through the filter 50 and the air sucked from the duct D3 are exhausted out of the duct D2 by the sirocco fan 52. The air discharged from the duct D2 by the sirocco fan 52 is guided to the photosensitive drums 4Y, 4M, 4C, 4K and the developing devices 7Y, 7M, 7C, 7K.

  Here, a specific configuration of the cooling device 100 will be described with reference to the drawings. FIG. 5 is a perspective view of the ducts D2K, D2C, and D2. FIG. 6 is a perspective view of the duct D2, the filter 50, and the sirocco fan 52. FIG. FIG. 7 is a cross-sectional structure diagram of the duct D2, the filter 50, and the sirocco fan 52. FIG. 8 is a perspective view of the image forming apparatus 1.

  The main body 3 includes sheet metals 60 and 62 as shown in FIG. The sheet metal 60 is a metal plate provided on the negative side in the y-axis direction with respect to the photosensitive drums 4Y, 4M, 4C, and 4K and the developing devices 7Y, 7M, 7C, and 7K. The sheet metal 62 is a metal sheet provided on the negative side in the y-axis direction from the sheet metal 60. A space Sp is provided between the sheet metal 60 and the sheet metal 62.

  The ducts D2Y, D2M, D2C, D2K (only the ducts D2C, D2K are shown in FIG. 5) are configured by cover members 80Y, 80M, 80C, 80K and a sheet metal 62 as shown in FIG. The cover members 80Y, 80M, 80C, and 80K are cylindrical flow path forming members that are not provided with a negative-side surface in the y-axis direction, and extend in the z-axis direction. The cover members 80Y, 80M, 80C, 80K are attached to the surface of the sheet metal 62 on the positive direction side in the y-axis direction. As a result, the negative side in the y-axis direction of the cover members 80Y, 80M, 80C, 80K is closed by the sheet metal 62. Further, triangular holes are provided at the ends of the cover members 80Y, 80M, 80C, and 80K on the positive side in the z-axis direction. The negative ends of the ducts D1Y, D1M, D1C, and D1K in the y-axis direction are connected to the holes of the cover members 80Y, 80M, 80C, and 80K, respectively. Thereby, the ducts D2Y, D2M, D2C, and D2K are connected to the ducts D1Y, D1M, D1C, and D1K, respectively.

  As shown in FIGS. 5 and 6, the duct D <b> 2 includes cover members 82 </ b> CK and 82 </ b> YM (not shown in FIGS. 5 and 6), 84, 85, 86 and 88 and a sheet metal 62. The cover members 82CK and 82YM are cylindrical flow path forming members that are not provided with a negative-side surface in the y-axis direction, and extend in the x-axis direction. The cover members 82CK and 82YM are attached to the surface of the sheet metal 62 on the positive direction side in the y-axis direction. Accordingly, the negative side in the y-axis direction of the cover members 82YM and 82CK is closed by the sheet metal 62. Further, end portions on the negative side in the z-axis direction of the cover members 80C and 80K are connected to the cover member 82CK. Similarly, end portions on the negative side in the z-axis direction of the cover members 80Y and 80M (not shown) are connected to a cover member 82YM (not shown). Thereby, the ducts D2Y, D2M, D2C, and D2K are respectively connected to the duct D2.

  Further, as shown in FIGS. 5 and 6, a hole is provided in a portion of the sheet metal 62 that overlaps the end portion on the negative direction side in the x-axis direction of the cover members 82CK and 82YM.

  As shown in FIG. 6, the cover member 84 is a box-shaped flow path forming member that is not provided with a surface on the positive direction side in the y-axis direction, and in the sheet metal 62, the cover members 82 </ b> CK and 82 </ b> YM are arranged in the x-axis direction. The hole provided in the part which overlaps with the edge part of the negative direction side is covered. Accordingly, the air that has passed through the cover members 82CK and 82YM flows into the cover member 84. Further, as shown in FIGS. 6 and 7, a filter 50 is provided in the cover member 84.

  As shown in FIGS. 6 and 7, the duct D <b> 3 is a cylindrical flow path forming member and is connected to the downstream side of the filter 50 of the cover member 84.

  As shown in FIGS. 5 and 6, the cover member 85 is a container having an intake port and an exhaust port, and incorporates a sirocco fan 52. The intake port of the cover member 85 is connected to the cover member 84.

  As shown in FIG. 6, the cover member 86 is a cylindrical flow path forming member and is connected to the exhaust port of the cover member 85. The cover member 86 is attached to the surface of the sheet metal 62 on the negative direction side in the y-axis direction.

  As shown in FIG. 6, the cover member 88 is a cylindrical flow path forming member, and is attached to the surface of the sheet metal 62 on the positive side in the y-axis direction. The cover member 86 and the cover member 88 overlap when viewed in plan from the y-axis direction, and are connected via a hole provided in the sheet metal 62. Thereby, the downstream end of the duct D2 is connected to the space Sp.

  As shown in FIG. 8, the air discharged from the duct D2 flows through the space Sp and is guided to the photosensitive drums 4Y, 4M, 4C, 4K and the developing devices 7Y, 7M, 7C, 7K. In particular, in the image forming apparatus 1, the air discharged from the duct D2 flows through the space Sp as shown in FIG. 8, and is guided to the photosensitive drums 4C and 4K and the developing devices 7C and 7K. The photosensitive drum 4K and the developing device 7K have toner images formed on the photosensitive drums 4Y, 4M, 4C, and 4K among the photosensitive drums 4Y, 4M, 4C, and 4K and the developing devices 7Y, 7M, 7C, and 7K. It is located closest to the transport path R (see FIG. 1) through which the sheet to be transferred passes. The photosensitive drum 4C and the developing device 7C include toner formed on the photosensitive drums 4Y, 4M, 4C, and 4K among the photosensitive drums 4Y, 4M, 4C, and 4K and the developing devices 7Y, 7M, 7C, and 7K. It is positioned second closest to the transport path R (see FIG. 1) through which the sheet onto which the image is transferred passes. Therefore, the photosensitive drums 4C and 4K and the developing devices 7C and 7K are easily affected by heat from the fixing device 20. Therefore, in the image forming apparatus 1, the air discharged from the duct D2 is guided to the photosensitive drums 4C and 4K and the developing devices 7C and 7K.

(effect)
According to the image forming apparatus 1 configured as described above, the photosensitive drum 4 and the developing device 7 can be sufficiently cooled. More specifically, in the image forming apparatus described in Patent Literature 1, the suction duct sucks air containing scattered toner from the case. A toner image forming device, a fixing device, and the like are accommodated in the case and are in a relatively high temperature state. Therefore, the air sucked by the suction duct is relatively high temperature. Even if such high-temperature air is guided to the predetermined member, the predetermined member is not sufficiently cooled.

  Therefore, in the image forming apparatus 1, a duct D3 that sucks air from outside the main body 3 is provided on the upstream side of the sirocco fan 52 of the duct D2. Thereby, the air discharged from the duct D2 is a mixture of the air sucked from the suction holes H1Y, H1M, H1C, H1K, H2Y, H2M, H2C, and H2K and the air sucked from the duct D3. . Therefore, the temperature of the air sucked from the outside of the main body 3 through the duct D3 is lower than the temperature of the air sucked from the suction holes H1Y, H1M, H1C, H1K, H2Y, H2M, H2C, and H2K. Accordingly, the temperature of the air guided to the photosensitive drum 4 and the developing device 7 in the image forming apparatus 1 is lower than the temperature of the air guided to a predetermined member in the image forming apparatus described in Patent Document 1. As a result, the image forming apparatus 1 can sufficiently cool the photosensitive drum 4 and the developing device 7 as compared with the image forming apparatus described in Patent Document 1.

  In the image forming apparatus 1, the air discharged from the duct D2 is a mixture of the air sucked from the suction holes H1Y, H1M, H1C, H1K, H2Y, H2M, H2C, and H2K and the air sucked from the duct D3. Air. The amount of air discharged from the duct D2 in the image forming apparatus 1 is larger than the amount of air discharged from the suction duct of the image forming apparatus described in Patent Document 1. As a result, the image forming apparatus 1 can sufficiently cool the photosensitive drum 4 and the developing device 7 as compared with the image forming apparatus described in Patent Document 1.

  The duct D3 is connected to the duct D2 on the downstream side of the filter 50. Thereby, the air passing through the duct D3 does not pass through the filter 50. As a result, more air flows into the duct D2 through the duct D3.

  Further, in the image forming apparatus 1, the air discharged from the duct D2 flows through the space Sp as shown in FIG. 8, and is guided to the photosensitive drums 4C and 4K and the developing devices 7C and 7K. The photosensitive drum 4K and the developing device 7K have toner images formed on the photosensitive drums 4Y, 4M, 4C, and 4K among the photosensitive drums 4Y, 4M, 4C, and 4K and the developing devices 7Y, 7M, 7C, and 7K. It is located closest to the transport path R (see FIG. 1) through which the sheet to be transferred passes. The photosensitive drum 4C and the developing device 7C include toner formed on the photosensitive drums 4Y, 4M, 4C, and 4K among the photosensitive drums 4Y, 4M, 4C, and 4K and the developing devices 7Y, 7M, 7C, and 7K. It is positioned second closest to the transport path R (see FIG. 1) through which the sheet onto which the image is transferred passes. Therefore, the photosensitive drums 4C and 4K and the developing devices 7C and 7K are easily affected by heat from the fixing device 20. Therefore, in the image forming apparatus 1, the air discharged from the duct D2 is guided to the photosensitive drums 4C and 4K and the developing devices 7C and 7K. As a result, the photosensitive drums 4C and 4K and the developing devices 7C and 7K are efficiently cooled.

  In the image forming apparatus 1, a sirocco fan 52 is used. As will be described below, the sirocco fan 52 can reduce the size of the image forming apparatus 1 and can efficiently suck scattered toner. FIG. 9 is a graph showing the relationship between the air volume and static pressure of the sirocco fan and the axial fan. The vertical axis represents static pressure, and the horizontal axis represents air volume. Further, FIG. 9A shows passage characteristics of the flow path having a large cross-sectional area (low resistance), and FIG. 9B shows a small cross-sectional area of the flow path (high resistance). ) The passage characteristics of the flow path are shown.

  In the flow path having a large cross-sectional area, as shown in FIG. 9A, the axial fan has a higher static pressure and a larger air volume than the sirocco fan. However, in a flow path with a small cross-sectional area, as shown in FIG. 9B, the sirocco fan has a higher static pressure and a larger air volume than the axial fan. Here, in order to make the image forming apparatus 1 compact, it is preferable that the cross-sectional area of the flow path is small. Further, from the viewpoint of efficiently sucking the scattered toner, a higher static pressure is preferable. Therefore, as shown in FIG. 9B, it is known that when the cross-sectional area of the flow path is small, the sirocco fan has a higher static pressure. Therefore, in the image forming apparatus 1, by using the sirocco fan 52, the image forming apparatus 1 can be reduced in size and scattered toner can be sucked efficiently.

(Computer simulation)
The inventor of the present application performed a computer simulation described below in order to clarify the effect of the image forming apparatus 1. Specifically, the inventor of the present application created a first model having the same structure as that of the image forming apparatus 1, and created a second model of the image forming apparatus according to the comparative example in which the duct D3 is not provided. Then, the inventor of the present application calculated an inflow amount A1 to the duct D2, an inflow amount A2 from the duct D3, and an outflow amount A3 from the duct D2 by using ANSYS FULLE (manufactured by ANSYS). FIG. 10 is a diagram illustrating a simulation result based on the first model. FIG. 11 is a diagram showing a simulation result by the second model. Table 1 is a table showing simulation results.

  According to FIG. 10, FIG. 11, and Table 1, it turns out that the outflow amount A3 is increasing by providing the duct D3. As a result, in the image forming apparatus 1, it is possible to guide more air to the photosensitive drum 4 and the developing device 7, so that the photosensitive drum 4 and the developing device 7 can be efficiently cooled. Further, the increase in the outflow amount A3 corresponds to the inflow amount A2 sucked from the outside of the main body 3. Therefore, the temperature of the air discharged from the duct D2 in the first model is lower than the temperature of the air discharged from the duct D2 in the second model. Therefore, the image forming apparatus 1 can efficiently cool the photosensitive drum 4 and the developing device 7.

  As described above, the present invention is useful for an image forming apparatus, and is particularly excellent in that a predetermined member can be sufficiently cooled.

H1Y, H2Y, H1M, H2M, H1C, H2C, H1K, H2K Suction hole Sp Space 4Y, 4M, 4C, 4K Photosensitive drum 7Y, 7M, 7C, 7K Developing device 50 Filter 52 Sirocco fan 60, 62 Sheet metal D1Y, D1M , D1C, D1K, D2Y, D2M, D2C, D2K, D2, D3 duct

Claims (7)

The body,
A cylindrical photoreceptor provided in the main body and extending in a predetermined direction ;
A developing device provided in the main body and for applying toner to the photoreceptor;
A cooling device for cooling the predetermined member;
With
The cooling device is
There are two suction holes for sucking air containing scattered toner generated in the photosensitive member or the developing device, and are provided so as to face both ends of the photosensitive member in the predetermined direction. A first duct formed;
A second duct connected to the first duct;
A filter provided in the second duct and for removing the scattered toner from the air;
An air blowing means provided on the downstream side of the filter in the second duct and generating an air flow in the first duct and the second duct;
Contains
A suction part for sucking air from outside the main body is provided on the upstream side of the blowing means of the second duct,
The air discharged from the second duct by the blowing means is guided to the predetermined member;
An image forming apparatus. The suction part is provided in the second duct on the upstream side of the air blowing means and on the downstream side of the filter;
The image forming apparatus according to claim 1. The predetermined member is the photosensitive member and the developing device;
The image forming apparatus according to claim 1, wherein the image forming apparatus is an image forming apparatus. The image forming apparatus includes:
A transport path through which a print medium onto which a toner image formed on the photoconductor is transferred,
In addition,
The photosensitive member and the developing device are provided in a plurality of sets,
The predetermined member is the photosensitive member and the developing device that are located closest to the conveyance path in the plurality of sets of the photosensitive member and the developing device;
The image forming apparatus according to claim 1, wherein the image forming apparatus is an image forming apparatus. The cooling device is
A third duct which is the suction part and connected to the second duct;
Including further,
The image forming apparatus according to claim 1, wherein the image forming apparatus is an image forming apparatus. The first duct is provided in the developing device,
The second duct is provided in the main body;
The image forming apparatus according to claim 1, wherein the image forming apparatus is an image forming apparatus. The blowing means is a sirocco fan;
The image forming apparatus according to claim 1, wherein the image forming apparatus is an image forming apparatus.