JP2001114449A - Sheet conveying device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sheet conveying device capable of efficiently eliminate the heat generated from a driving source without mounting an etra discharging means. SOLUTION: Air holes 215 (recessed parts 214) and projecting parts 215 are alternately formed along the sheet conveying direction on a sheet-conveying path corresponding to an upper part of a driving motor 213. The heat generated from the driving motor 213 rises and is discharged by air from the air holes 216 at the upper part, in this occasion, the conveyed sheets are warmed by the heat and discharged to a discharging part 210. Whereby the driving motor can be mounted on a space surrounded by the sheet-conveying path, a device can be minimized, and the heat generated from the driving motor 213 can be efficiently exhausted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the technical field of a sheet conveying apparatus having a sheet conveying path for conveying a sheet and a driving source for transmitting a driving force for conveying the sheet to the sheet. .

[0002]

2. Description of the Related Art Conventionally, a driving source such as a motor is disposed outside a sheet conveying path, and a cooling air hole for the motor is provided and enclosed in an exterior part or a frame housing near the motor, and heat radiation is performed. Either natural convection means is used, or an exhaust fan or the like may be separately provided in some cases, so that the air whose temperature has risen from the inside is forcibly exhausted.

For example, a general image forming apparatus will be described with reference to FIG. 5, for example. An exterior 102 near a motor 9 which is a driving source of the image forming apparatus 100 is provided with a wind hole 101. A plurality of openings are juxtaposed in a louver shape, and heat released from the motor 9 and other loads 10 and 11 disposed in the vicinity of the motor 9 flows through the air holes 101 by natural convection. It is discharged in the direction of arrow A, which is the rear surface of the device.

On the rear side of the image forming apparatus 100, an exhaust fan 5 for forcibly releasing internal heat is provided. Reference numeral 1 denotes a main motor for driving a photoconductor and the like (not shown) of the image forming apparatus 100, and heat released from the main motor 1 is discharged in the direction of arrow B through a wind hole of an exterior 102 (not shown).

[0005] Paper feed clutches 7 and 8 are provided near the lower portion of the main motor 1, and near the upper portion thereof, mirror motors 3 and 4 for driving an optical system (not shown) and lenses and mirrors (not shown) are provided. A lens mirror motor 2 for driving, a sheet detection switch 14 for sheet detection, and the like are densely arranged, and the heat released here is forcibly discharged by the above-described exhaust fan 1 and naturally. Wind hole 1 by convection
03 is discharged in the direction of arrow C.

Further, exhaust fans 6 and 13 are provided on the paper discharge side of the image forming apparatus 100, for example, silicon gas, ozone, developer or paper dust discharged from a fixing unit or a process unit (not shown). High-temperature air including air and the like is exhausted in the direction of arrow D through an air hole of the exterior 102 (not shown). At this time, heat released from the other loads 10, 11, and 12 is also discharged.

In this way, the air whose temperature has increased due to the heat released from each load (drive source) in the apparatus is discharged to the outside of the apparatus, and there is a temperature range that may be touched by a user or a temperature range in terms of the performance of the apparatus. Is suppressed from increasing in the portion where is defined.

[0008]

However, when the heat generated by the drive source such as a motor is relied on the discharge by natural convection, the amount of heat that can be discharged is limited. It is difficult to meet safety standards and other regulations that regulate temperature rise, resulting in a product lacking in safety and reliability. This causes a problem of rising.

Therefore, in general, by using a higher-grade driving source having a margin for driving torque or the like and performing power control to reduce electric power supplied by pulse width modulation or the like, heat generated from the driving source is obtained. Is generally suppressed.

In this case, if the driving source has a surplus, the driving source itself becomes expensive and the weight of the device increases, and in addition, the external shape generally becomes large. Since the drive source is disposed outside the sheet conveyance path (at a position separated from the sheet conveyance path), there is a problem that the outer shape of the entire apparatus becomes large, and the degree of freedom in design is hindered in order to prevent the outer shape of the apparatus from becoming large. was there.

In particular, in recent image forming apparatuses and the like in which downsizing is progressing, space saving and weight reduction are major issues, and with the downsizing of the apparatus, a space for forming an air flow is formed inside the apparatus. Is reduced,
The air flow inside the device is not smoother than ever before, and the temperature tends to rise.If a large drive source with extra power is used to suppress the temperature rise, the excess flow inside the device will be further reduced. There was a dilemma that it became more difficult to lower the temperature.

On the other hand, when the heat generated by the drive source is radiated not by natural convection but by providing a separate exhaust fan or the like, a space for the fan is required, which hinders miniaturization and weight reduction of the apparatus. Problems, such as the problem of lowering the degree of freedom of design, the problem that extra power is required, the power supply becomes large, expensive and requires wiring and insulation, and the exhaust fan itself emits heat, so adding a fan The problem is that the amount of heat that dissipates increases, the problem that noise is generated, and the air flow cannot be efficiently discharged without paying attention to the arrangement of the fans (for example, if there are fans that discharge in the opposite direction, the discharge efficiency decreases with each other). And the problem of scattering dust and dust in the apparatus outside the apparatus depending on the air volume.

In particular, when the sheet conveying device is a document reading device provided with a light source for reading a document, the light source itself generally has a large load and is heated to a high temperature. Even in comparison with a drive motor or the like, there is a serious problem that it is necessary to release a remarkably large amount of heat to the outside of the apparatus in order to reduce the temperature rise.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and has as its object to provide no extra discharge means and to hinder the reduction in size and weight of the apparatus. Another object of the present invention is to provide a sheet discharging apparatus that efficiently discharges heat generated from a driving source while avoiding the problem of reducing the degree of freedom in design.

[0015]

According to the present invention, there is provided a sheet conveying path through which a sheet is conveyed, and a sheet conveying member disposed at or near the sheet conveying path and performing an operation related to the sheet conveying. A sheet transport device comprising a drive source for driving the sheet transport member, wherein the sheet transport path, the sheet transport member and the drive source are sealed by a housing, wherein the sheet transport path includes the drive From the lower side of the source to the upper side, the driving source is disposed so as to be folded back so as to surround at least the right side or the left side of the driving source, and the sheet conveying path is further provided with a hole at a position above the driving source. It is a sheet conveyance device characterized by having.

Further, according to the present invention, a convex portion for forming a step with the hole is formed at a position near the hole in the sheet conveying path. Device.

Still further, according to the present invention, the holes and the protrusions are alternately provided at least two in the sheet conveying direction, and the sheet and the convex portion are provided at a position above the sheet conveying path corresponding to an upper position of the driving source. A sheet transport guide plate that guides the transport of the sheet is disposed substantially parallel to the sheet transport path, and a line connecting an upper end portion of the convex portion is substantially parallel to a lower end surface of the transport guide plate. The sheet conveying device according to claim 2.

Further, according to the present invention, a sheet conveying member for conveying a sheet is provided on each of an upstream side and a downstream side in the sheet conveying direction with respect to the hole, and the sheet conveying speed is higher than the sheet conveying speed of the sheet conveying member on the downstream side. 2. The sheet conveying apparatus according to claim 1, wherein the sheet conveying speed of the sheet conveying member on the side is set to be high.

Further, the present invention provides a sheet conveying path for conveying a sheet, a sheet conveying member disposed at or near the sheet conveying path and performing an operation related to sheet conveying, and a sheet conveying member. A driving source for driving the sheet, a reading unit provided in the sheet conveyance path for reading image information of a sheet, and a reading guide plate for guiding sheet conveyance in the reading unit, the sheet conveyance path, A sheet conveying device in which the sheet conveying member, the driving source, the reading unit, and the reading guide plate are sealed by a housing, wherein the sheet conveying path includes the reading unit disposed below the driving source, The drive source is arranged so as to be folded upward so as to surround at least a right side or a left side of the drive source from the lower side to the upper side to convey the sheet, and the sheet conveying path further includes the drive unit. And the hole located above the, a sheet conveying apparatus characterized by having a reading guide plate moving means for vertically moving the reading guide plate.

Still further, the present invention provides a sheet conveying path for conveying a sheet, a sheet conveying member disposed at or near the sheet conveying path and performing an operation related to sheet conveying, and a sheet conveying member. And a gear member for transmitting the drive from the motor to the sheet conveying member, the sheet conveying path,
A sheet conveying device in which the sheet conveying member and the motor are hermetically sealed by a housing frame, and the gear member is provided outside the housing frame. A sheet conveying device, wherein a hole communicating with the inside of the housing frame is provided, and a blade portion for discharging air from the housing frame is provided inside the gear member.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An overall outline of an image forming apparatus according to an embodiment of the present invention will be described below with reference to FIG.
In this embodiment, the case where the sheet conveying apparatus of the present invention is applied to an image forming apparatus will be described. However, the sheet conveying apparatus according to the present invention can be applied only to an image forming apparatus such as a copying machine, a printer, and a facsimile. Instead, the present invention can be applied to any sheet conveying device that is surrounded by a housing, has a driving source, and can convey a sheet, such as a document reading device, a sorter, and a finisher. The present invention can be applied to various apparatuses such as a post-processing apparatus, an intermediate tray unit of an image forming apparatus, an automatic document feeder, and various printing machines.

The upper surface of the image forming apparatus 100 has a document table 21 made of transparent glass or the like.
A desired document is placed on the device, and a user gives an image forming instruction to the apparatus by pressing a key or the like, whereby a copy image of the document can be formed.

A scanner optical system 2 is provided below the document table 21.
2, an exposure light source 36 for irradiating the original placed on the original table 21 with light, and reflected light from the original on the opposite surface via the imaging lens 23. CCD
(Photoelectric conversion element) A plurality of reflecting mirrors 25a for guiding to 24
To 25c.

Further, a paper feed roller and a friction plate are provided below the scanner optical system 22 so that one sheet (paper, transfer material) can be stored therein.
There is provided a sheet feeding device including a sheet feeding unit for feeding sheets one by one, a sensor for detecting that a sheet has entered, a roller for conveying a sheet, and a discharge unit for discharging and placing the sheet. ing.

The read original image data is subjected to various image processing such as data correction and analog-to-digital conversion, is subjected to desired image processing, and is processed by a laser scanning unit (hereinafter abbreviated as LSU) 26. Is irradiated onto the surface of the photoreceptor 27, and a desired electrostatic latent image is formed on the surface of the photoreceptor charged to a predetermined potential.

The photosensitive member 27 has a cylindrical (drum) shape rotatable in the direction of arrow E.
A developing device 29 for developing an electrostatic latent image on the surface of the photoconductor exposed by the laser with toner from the laser irradiation point 28 toward the rotation direction of the photoconductor 27;
Transfer roller 3 for transferring the upper toner image onto a sheet
0, a charger (not shown) for charging the photoconductor 27 to a predetermined potential, an LSU 26 for irradiating a laser toward a laser irradiation point 28, and the like are sequentially provided.

The sheets are placed and stored on a sheet (paper) tray 31 on the right side in the figure, and a pickup roller 32 for feeding the sheet is disposed at the leading end of the sheet tray 31. The sheet is conveyed in the direction of arrow F indicated by the dotted line.

Here, in the conveying direction F, when the sheet tray side is the upstream side and the opposite direction is the downstream side (left side in the drawing), the passage of the sheet toward the downstream side of the conveying path is detected. The toner image on the photoreceptor 27 is transferred to a sheet roller (not shown) provided to match the transfer position of the leading end of the sheet based on a detection signal of the sheet sensor switch (not shown). A fixing roller pair 33 for fixing the resulting toner image with heat and pressure, and a discharge roller pair 34 for detecting that the sheet has passed upstream of the paper discharge unit are arranged in order along the transport direction, respectively.
The sheet is fed from the right side of the image forming apparatus 100 in the drawing, and then discharged to the discharge section 35 on the left side and stacked.

(First Embodiment of the Present Invention) The first embodiment of the present invention
1 is described above with reference to FIG. 1. Above the above-described image forming apparatus 100, a movable document reading apparatus 200 serving as a sheet conveying apparatus is provided. Even if it is not placed on the table 21, it is automatically fed and can be read. Original movable reading device 2
In the right side of the drawing of FIG.
1 is provided.

The original placed on the placing table 201 is fed to a dashed line G constituting a sheet conveying path by a feeding means (not shown).
The document which is fed in the conveyance direction indicated by, and detected by the document detection sensor 202 is further fed by a sheet feeding roller pair 203 which is a sheet conveying member. In FIG. 1, the sheet feed roller pair 203 is illustrated, but as shown, a separating plate 217 may be used instead of or in combination with the lower sheet feed roller. In the case of using a paper feed roller and a separating plate, the manufacturing cost can be reduced by a simple configuration, and the apparatus can be made smaller in the vertical direction by making it thinner than the diameter of the paper feed roller.

Documents fed one by one by a paper feed roller pair or a paper feed unit composed of a paper feed roller and a separation plate pass through a paper input sensor (Pin sensor) 204 for detecting the input of a document, and Reaches the PS roller 205 which is a sheet conveying member for synchronizing the conveyance of the original and the reading operation of the original.
The reading unit 206 performs a reading operation of a document image. still,
The optical unit of the image forming apparatus 100 is located below the reading unit 206. As described above with reference to FIG. 2, the irradiation light from the light source 36 is reflected by the original, and the reflected light is reflected by the mirror 25a.
-25c and the lens 23 to reach the CCD 24, where an image is read.

Then, the document portion after the image reading is further conveyed by a pair of conveying rollers 207 as a sheet conveying member, passes through a U-shaped conveying section, and passes through a concavo-convex shape section 208 described later in detail. While being guided by a discharge paper guide 210 via a discharge roller pair 209 serving as a sheet conveying member, the sheet reaches the discharge unit 211 and is placed thereon.

In the reading device 200, the transport guide plate 21 for transporting a document or constituting a read guide plate is provided.
A drive motor 213 as a drive source for moving the sheet 2 in the vertical direction is disposed at a substantially central position surrounded by the sheet conveying path. This is because it has been difficult to arrange the large-sized driving source in the document conveying path because a relatively large-sized driving source is conventionally used with a margin for raising the temperature and exhausting the same. As described above, since the heat radiation efficiency of the driving source is improved, it is possible to use a small driving source without using a large driving source having a margin.

The above-described uneven portion 208 is provided above the motor 201, and the uneven portion 208 is formed with a concave portion 214 and a convex portion alternately along the document conveying direction G. The projecting portion 215 is formed in a so-called step-like manner, and a part of the recessed portion 214 has an air hole portion 2 forming a hole portion.
16 is provided so that the space in which the motor 213 is provided and the upper space of the document conveying path communicate with each other. The shape of the air hole 216 may be a long hole (rectangle) in a direction penetrating the paper surface in the drawing (front-rear direction), or a circular air hole may be linearly provided in the front-rear direction. good. However, when the air hole is rectangular, it is necessary to make the dimension shorter than the minimum size sheet to be conveyed so that the sheet end does not enter the air hole 216.

As a result, when the motor 213 is driven and generates heat, the temperature of the surrounding air that rises rises, and the air hole 21 rises.
6, the heat is radiated (moved) to the upper part of the transport path.
Further, since the document passes over the air hole 216, the temperature of the document itself is lower than that of the motor 201, so that heat is transmitted to the document and the document is conveyed toward the discharge port.
The original is discharged to the discharge section in a warmed state. Note that at least one or more air holes and projections are required, but if only one projection is provided, sheet conveyance tends to be unstable. Therefore, a plurality of sets may be provided along the sheet conveyance direction G. desirable.

Further, the concave / convex portion 208 is provided with the concave portion 214.
The convex and concave portions 215 form a step-like uneven shape, so that the air hole 216 is not completely sealed by the document surface, so that the flow of air is not hindered. Since only the uppermost portion (apex) of the contact is in contact, the frictional resistance during transfer is minimized, and the transfer is not likely to be hindered. Further, the top is not sharpened, but is formed into a wavy shape by providing R, so that the frictional resistance can be further reduced and paper jam can be prevented.

The line connecting the upper vertices of the respective projecting portions 215 may be configured so as to be substantially parallel to the document conveying guide 230 which is the sheet conveying guide which is opposed to the line. As a result, it is possible to avoid a problem such as a paper jam due to bending of the document due to bending of the document, and it is possible to smoothly transport the document. Instead of drilling in the base plate, a mesh member may be provided on the transport path. In this case, it is easy to manufacture a mold for the base plate portion, and a general-purpose mesh member is used. Inexpensive and easy to manufacture.

In this case, it is also possible to make the conveying speed of the original at the time of reading the original constant, and to increase the conveying speed of the original after the rear end of the original has passed through the reading section. Specifically, when it is determined that the trailing edge of the document has passed the reading unit 206 based on the relationship between the document size and the transport speed and the detection of the trailing edge of the document by the CCD 24, the transport roller pair 207 and the discharge roller pair 20 are determined.
9 is increased. As a result, the air hole 2
Convection in the sheet conveying direction occurs at the upper portion of the sheet 16, and in addition to the original taking away heat, the heat can be guided to move quickly outside the apparatus by the convection.

By setting the rotation speed of the discharge roller pair 209 to be lower than the rotation speed (sheet conveyance speed) of the conveyance roller pair 207, the paper is bent between the conveyance roller pair 207 and the discharge roller pair 209. Can be generated, so that the resistance to air is increased, so that the sheet swings, so that heat is pushed out to the discharge port, and the cooling effect can be improved.

Further, since the sheet has an upwardly convex shape, it is possible to further reduce the adverse effect of blocking the air hole 216 by the sheet, to reduce the air flow resistance, and to reduce the vicinity of the motor 201 by the negative pressure when the convex shape is formed. The air is also lifted and the cooling effect can be further increased. Since the guide 230 is provided along the conveyance path above the uneven portion 208, it is possible to prevent the sheet from being jammed by the action of air or the like that causes the sheet to rise.

In FIG. 1, the sheet conveying path is formed from below to above so as to surround the left side of the motor 213. However, it goes without saying that the sheet conveying path surrounds the right side of the motor 213. It is needless to say that the same effect can be obtained even when the sheet is folded back to form the sheet conveyance path from below. In this case, the positional relationship between the placement unit 201 and the discharge unit 210 is exactly the opposite relationship (that is, the discharge unit 210 is located at the upper left in the drawing, and the placement unit 201 is located at the lower left).

Further, in the above embodiment, the sheet is conveyed from the lower side to the upper side, and the heat of the motor 213 rises, and the heat is transmitted to the sheet passing through the uneven portion, and the temperature of the sheet is raised. Is discharged to the discharge unit 210, so that the heat of the motor 213 is also discharged. However, in the present invention,
The present invention is not limited to this, and it is expected that the heat discharging ability is slightly reduced. However, the present invention is also applicable to the case where the sheet is conveyed from above the motor to the bottom, for example, the case where the sheet is conveyed in the direction opposite to arrow G. In this case, it goes without saying that the positional relationship between the discharge unit 210 and the placement unit 210 in FIG. 1 is reversed.

Further, in the above-described embodiment, the uneven portion is provided at an upper position in order to discharge the heat from the motor 213. In order to discharge heat from a heat source such as an unrelated driving source, an uneven portion may be appropriately provided near an upper portion of the heat source. This makes it possible to discharge heat other than the heat of the drive source directly related to sheet conveyance.

(Second Embodiment of the Present Invention)
The embodiment will be described below with reference to FIG.
Note that FIG. 3 corresponds to a diagram near the reading unit 206 in FIG. 1 for simplicity of description.

A transport guide plate 212 serving as a reading guide plate for guiding a document to a document reading position is disposed downstream of the PS roller pair 205 in the transport direction.
Are supported so as to be movable in the vertical direction H about the rotation axis of the PS roller pair 205. That is, support portions 212a are provided on both side surfaces of the transport guide plate 212, and through the holes 212b formed in the support portions 212a,
The pair of PS rollers 205 are supported by a rotating shaft 205a.

The notch 21 is provided near each support 212a.
2c is provided, and a cam mechanism 219 is provided in the notch 212c.
Is arranged, and the transport guide plate 212 reciprocates in the H direction by the rod-shaped member 213a connected to the drive motor 213. Further, a reading roller 220 for transporting the original by the reading unit 206 is provided, and the reading roller 220 is rotatable about a rotation shaft 220a. The member 213c is connected.

Although a rotary drive source of the reading roller is not shown, it may be a drive motor 213 or another drive motor, or may be driven in accordance with document transport without providing a drive source. . Although not shown, in the cam mechanism 219, a sleeve is provided at the end of the reading roller 220, and a protrusion is provided on the circumference of the sleeve, and rotation is controlled by deenergizing / biasing by a solenoid, a spring clutch, or the like. You may do it. That is, for convenience, the reading roller and the eccentric cam portion are illustrated in the same cross section, but they may be configured separately or may be provided integrally.

When an original is set on the movable original reading device 200 and read, one original is fed by the sheet feeding roller pair 203 (the separating plate 217), and the original is detected by the pin sensor 204. Is done. Next, the original is transported to the original reading unit 206 by the PS transport roller pair 205, and the original is transported in order from the transport roller pair 207 to the discharge roller 209.

The detection of the trailing edge of the original is performed, for example, by using the Pin sensor 2.
04, or when a predetermined time elapses after the transition to the document non-detection state, the solenoid is urged to rotate the eccentric cam, whereby the transport guide plate is reciprocated in the vertical direction H, and the air inside the apparatus is Is actively exchanged, the air whose temperature has risen in the apparatus is discharged, and cooling can be performed reliably.

In the above-described embodiment, the temperature rise can be suppressed by using the transport guide plate 212 serving as a guide plate when a document is transported. However, since the transport guide plate is moved up and down. Instead of using an eccentric cam, for example, a solenoid or a clutch may be directly connected to at least one of the directions orthogonal to the transport direction of the transport guide plate for movement.

The transport guide plate 212 may be moved up and down between the end of the original reading operation and the start of the next original reading operation. In this case, the original reading operation is performed. There is no substantial delay in operation. Since the operation is not performed except during the document reading operation, the noise can be reduced or the noise can be made inconspicuous.

Further, in the above-described embodiment, the motor for transporting the sheet and the transport guide plate are exemplified to be moved up and down as the driving source. For example, instead of the motor 213 in the transport path, the transport is The present invention can be applied to all loads that may increase in temperature, such as a light source 36, a solenoid, a clutch, a motor, a fan, and a laser, which need to be disposed in the vicinity of the transport path for other uses.

(Third Embodiment of the Present Invention) The third embodiment of the present invention
The embodiment will be described below with reference to FIG. FIG.
As shown in (a) and (b), the drive motor 300 is disposed in the inner space of the frame 303, which is the housing frame of the device, and is driven to the outer space of the frame 303 via the drive shaft 300a of the drive motor 300. 301a as a gear member for use
To 301d, the gears 301a and 301b, the gear 30
1b and 301c and the gears 301c and 301d are in mesh with each other, and holes 302a, 302b,... Are formed in the frame 303 to improve air permeability.

The present embodiment can be applied to any apparatus having a drive source, a drive gear, and a housing surrounding the drive source. Therefore, the movable document reading apparatus described with reference to FIGS. It goes without saying that the present invention can be applied not only to the apparatus 200 but also to the housing of the image forming apparatus 100 and the like.

As shown in FIG. 4C, the gear 301 has a hollow portion 301g between the gear shaft portion 301e and the gear portion 301f, and air is passed through the hollow portion 301g. It comprises a blade portion 301h provided to allow the flow to flow. Therefore, although the frame 303 exists on the surface facing the drive motor 300, the hole 303 is formed in the frame 303.
Since the originals 02a, 302b,... Are perforated, the original is conveyed or the like, the drive motor 300 is driven, and the gears 301a to 301d rotate accordingly, thereby discharging the temperature-raised air inside the frame 303. The temperature rise can be suppressed. In addition, there is no need to provide a separate exhaust fan or the like for cooling, so that space saving, weight reduction, cost reduction, and low power consumption of the device can be achieved.

By rotating the direction of rotation forward and backward, it is possible to send low-temperature air into the apparatus by the blades 301h of each gear, and to discharge high-temperature air out of the apparatus. In this case, the cooling efficiency in the apparatus can be further increased as compared with the case where air can be blown only in one direction. In this case, when the temperature inside the apparatus rises, for example, when a predetermined number or more of originals have been read, the above-described two-directional blowing may be performed alternately.

[0057]

According to the present invention, heat can be dissipated even when a sheet is being conveyed while miniaturizing the apparatus and saving space without using a special fan or the like for discharging. The cooling in the apparatus can be efficiently performed without causing any inconvenience in sheet conveyance.

[Brief description of the drawings]

FIG. 1 is an overall sectional view of a document reading apparatus according to an embodiment of the present invention.

FIG. 2 is an overall sectional view of the image forming apparatus according to the embodiment of the present invention.

3A and 3B are cross-sectional views of main parts of a movable document reading apparatus according to another embodiment of the present invention, wherein FIG. 3A is a cross-sectional view of main parts near a reading unit, and FIG. 3B is a perspective view of a transport guide plate. Is shown.

4A and 4B are diagrams illustrating a positional relationship among a driving source, a driving gear, and a housing of a sheet conveying apparatus according to another embodiment of the present invention, wherein FIG. 4A is a cross-sectional view as viewed from above, and FIG. Front view,
(C) shows a perspective view of the gear.

FIG. 5 is a perspective view illustrating a positional relationship among a load, an exhaust fan, and an exhaust unit of an image forming apparatus according to the related art.

[Explanation of symbols]

 Reference Signs List 200 Document movable reading device (sheet transport device) 201 Placement section 202 Document detection sensor 203 Feed roller pair (sheet transport member) 204 Pin sensor 205 PS roller pair (sheet transport member) 205a Rotating shaft 206 Reading unit 207 For transport Roller pair (sheet conveying member) 208 Concavo-convex portion 209 Discharge roller pair (sheet conveying member) 210 Discharge paper guide 211 Discharge unit 212 Transport guide plate (reading guide plate) 213 Drive motor (drive source) 214 Depressed portion 215 Projecting portion (projecting portion) 216 Air hole (hole) 217 Separator 219 Cam mechanism (reading guide plate moving means) 220 Reading roller (sheet conveying member) 230 Paper guide

Claims (6)

[Claims] 1. A sheet conveying path for conveying a sheet, a sheet conveying member disposed at or near the sheet conveying path to perform an operation related to sheet conveyance, and a sheet conveying member for driving the sheet conveying member. A sheet conveying device, wherein the sheet conveying path, the sheet conveying member, and the driving source are hermetically sealed by a housing, wherein the sheet conveying path extends upward from below the driving source. A sheet feed path that is folded back so as to surround at least the right side or the left side of the drive source, and that the sheet feed path further has a hole at a position above the drive source. apparatus. 2. The sheet conveying apparatus according to claim 1, wherein a convex portion for providing a step with the hole is formed at a position near the hole in the sheet conveying path. 3. The sheet feeding apparatus according to claim 1, wherein the holes and the protrusions are alternately provided in the sheet conveying direction, and guide the sheet conveyance to a position above the sheet conveying path corresponding to an upper position of the driving source. 3. A sheet conveying guide plate which is disposed substantially parallel to the sheet conveying path and is opposed to the sheet conveying path, and a line connecting an upper end portion of the convex portion is substantially parallel to a lower end surface of the conveying guide. The sheet conveying device as described in the above. 4. A sheet conveying member for conveying a sheet is provided on each of an upstream side and a downstream side in the sheet conveying direction with respect to the hole, and the sheet conveying member on the upstream side with respect to the sheet conveying speed of the sheet conveying member on the downstream side. The sheet conveying apparatus according to claim 1, wherein the sheet conveying speed of the member is set to be high. 5. A sheet conveying path for conveying a sheet, a sheet conveying member disposed at or near the sheet conveying path to perform an operation related to sheet conveying, and a sheet conveying member for driving the sheet conveying member. A drive source, a reading unit provided in the sheet conveyance path for reading image information of a sheet, and a reading guide plate for guiding sheet conveyance in the reading unit, the sheet conveyance path, the sheet conveyance member, A sheet conveying device in which the driving source, the reading unit, and the reading guide plate are hermetically sealed by a housing, wherein the sheet conveying path includes the reading unit disposed below the driving source; It is disposed so as to be folded back so as to surround at least the right side or the left side of the driving source from below and to convey the sheet, and the sheet conveying path is further positioned above the driving source. Sheet conveying apparatus characterized by comprising: a part, a reading guide plate moving means for vertically moving the reading guide plate. 6. A sheet conveying path for conveying a sheet, a sheet conveying member disposed at or near the sheet conveying path to perform an operation related to sheet conveyance, and a sheet conveying member for driving the sheet conveying member. And a gear member for transmitting drive from the motor to the sheet conveying member, wherein the sheet conveying path, the sheet conveying member and the motor are hermetically sealed by a housing frame, and A sheet conveyance device provided with the gear member, wherein the housing frame includes a position near the position where the gear is provided,
A sheet conveying device, wherein a hole communicating with the inside of the housing frame is formed, and a blade portion for discharging air in the housing frame is provided inside the gear member.