JP2006352449A - Image scanner and image forming apparatus equipped with same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To simplify constitution to achieve cost reduction by integrally constituting a document feeder and an image scanner, and to improve DF opening/closing operability or the like. <P>SOLUTION: A document pressure plate is attached to a rotatable document feed tray to obtain common constitution of the paper feed tray and pressure plate, and united constitution of a document conveyance section and an image scanning section wherein a conveyed document is discharged onto a platen glass, is tilted. The constitution is installed in an image forming apparatus which has in-drum paper discharge constitution. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an image forming apparatus provided with an automatic document feeder such as a copying machine or a facsimile.

  2. Description of the Related Art In recent years, an image reading unit such as a copying machine or a facsimile and an image forming apparatus including the image reading unit have an image reading speed by an original document reading method (a method of reading a document image being conveyed while the scanner is stopped). Ups and downs of the structure, simplification, and cost reduction have been attempted.

  FIG. 1 shows an image forming apparatus provided with a conventional document conveying section. As shown in FIG. 1, the image reading unit 2 is installed horizontally above the image forming apparatus 3, and the document conveying unit 1 is installed above the image reading unit 2.

  FIG. 2 is a detailed cross-sectional view of the document conveying unit 1 and the image reading unit 2 shown in FIG. As a reading method in the image reading unit of this apparatus, there are a document reading method in the document conveying unit 1 and a fixed reading method on the platen glass 5. In the case of document scanning at the document conveying section 1, the scanner 6 stops at the position a in the figure below the scanning glass 4 and reads the image. In the case of fixed reading, the document is set on the platen glass 6. The scanner 6 moves in the horizontal direction (arrow direction in the figure) from the position b in the figure to the position c in the figure below the platen glass 5 to perform image reading.

  Further, as shown in FIG. 3 (left side view when the automatic document feeder 1 in FIG. 2 is opened), the document feeder 1 and the image reading unit 2 are separated from each other, and are connected via a rotating hinge 9. The document conveying section can be rotated in the direction of the arrow in the figure. The rotating hinge also prevents the document conveying unit 1 from dropping suddenly downward from the open position by a compression spring, an oil damper, or the like.

  Therefore, in the case of fixed reading, the document conveying unit is opened and then set on the platen glass 5 with the document image surface facing downward, the document conveying unit 1 is closed again, and the scanner 6 moves along the platen glass 5. Image reading is performed while moving. Further, at this time, in order to press the original against the fixed reading platen glass, the original conveying section is provided with an original pressing member 7 on the lower surface of the original discharge tray.

  In the case of the flow reading by the document conveying unit 1, the uppermost document in the stacked document bundle set on the document feeding tray 8 is conveyed to the separation roller 11 by the pick roller 10. At this time, the multi-fed original is separated by the separation roller 11. Next, the original conveyed by the separation roller 11 is conveyed through the U-turn path by the registration roller 12 and the read roller 13 and guided to direct the image surface of the original to the upper surface of the flow reading glass 4. The document conveyed on the upper surface of the flow reading glass 4 is nipped between the flow reading glass 4 and the platen roller 18 and is conveyed while the original image surface is in close contact with the flow reading glass surface. At this time, the scanner 6 of the image reading unit 2 stops below the platen roller 18 and reads the original image surface through the flow reading glass 4. The document that has passed through the reading position is guided to be lifted upward by a jump table 14 installed in the image reading unit 2, returns again to the path in the document transport unit, and is ejected by the transport roller 15 and the discharge roller 16. It is discharged onto the stacking tray 17. For this reason, for example, a configuration for carrying a document on the fixed reading platen glass surface and stopping a document by a document feeding system such as a document feeding belt is not required. Therefore, simplification and weight reduction of the deleted configuration, cost reduction, and the like have been attempted. Further, it is possible to continuously perform image reading without stopping the document being conveyed, and speeding up of image reading and improvement in productivity in image reading have been attempted.

  Further, in the image forming apparatus 3, the output paper discharge stacking tray 20 for stacking image-formed sheet materials is generally installed outside the image forming apparatus, that is, at a portion protruding from the configuration of the image forming apparatus. On the other hand, the image reading unit 2 is disposed under the image reading unit 2 and disposed inside the image forming apparatus main body. For this reason, space saving in the width direction of the entire apparatus has been achieved by installing a portion protruding from the image forming apparatus inside the configuration.

As a conventional example, for example, Patent Document 1 can be cited.
JP-A-2004-336271

  However, in the conventional configuration, in the configuration of the document conveying unit and the image reading unit, when performing fixed document reading, functionally, only the document crimping member is lifted and the document is set on the platen glass and again for document crimping. It is only necessary to close the member, but the user must also open and close the transport unit that is not functionally necessary at the time of fixed reading. Therefore, the operability is increased by the weight of the document conveying unit, and the operability is greatly impaired not only for general users but also for disability users.

  Further, in the rotation hinge, the rotation hinge associated with only the document pressing member is generally constituted only by a compression spring. Compared with this, the rotation hinge for preventing the sudden fall of its own weight in the configuration including the document conveying portion adds an oil damper in addition to the compression spring, and the compression spring is very strong in strength. Must be prevented. Accordingly, this increases the cost and complexity of the rotating hinge.

  Further, in document scanning, there is a problem that when dust adheres to the upper surface of the flow reading platen glass, the dust adhered on the scanner reading portion appears as an image streak. Against this image streak problem, if the document transport section is opened to set the document on the fixed reading glass, the flow reading platen glass will also be exposed, and stains due to user operations are likely to occur. Occurrence occurs easily.

  In the image forming apparatus, an output paper discharge tray for stacking image-formed sheet materials is disposed at a lower portion of the image reading unit, and is disposed inside the image forming apparatus main body. Therefore, the stacking height is limited, and it is impossible to stack a very large number of sheet materials, and the number of stacked sheets is limited to a small number. Further, since it is disposed at the lower part of the image reading unit, it is necessary to reach out to a narrow space when taking out the image-formed sheet material, and the takeout property of the sheet is poor.

  Therefore, in the present invention, in order to solve the above-described problems, the configuration of the document conveying unit is simplified and the weight is reduced, and the cost is thereby reduced, and the opening / closing operability of the document pressing plate is improved. It is another object of the present invention to obtain a configuration capable of improving sheet take-out performance and increasing the number of stacked sheets in an image forming apparatus having an in-body discharge configuration for image-formed sheets.

An image including an original conveying device and an image reading device, and an original conveying device capable of performing both an original document reading operation for reading an image while conveying an original document by the original conveying device and an original fixed reading operation. In the reader,
Further, in the present invention, in order to achieve the above object, a paper feeding document placing table for placing a document to be fed by the document conveying device, and a document disposed on the image reading device for performing fixed document reading. A platen glass on which the document is placed, a pressure plate arranged on the back surface of the sheet feeding document placing table, and for crimping the document set on the platen glass to the platen glass at the time of document fixed reading, and the platen A document reading unit and a reading unit that reads an image by document reading and document scanning; and the sheet feeding table is configured to be rotatable with a certain center of rotation. When reading, the document table is rotated so that the document table is adjacent to the vicinity of the paper feed port of the document conveying device, and when the document is fixedly read, the pressure plate is rotated so as to contact the platen glass. The present invention relates to an image reading apparatus including a document conveying device.

  According to another aspect of the present invention, there is provided an image reading apparatus provided with a document conveying device, wherein a document fed and read by a document conveying device during document scanning is discharged onto the platen glass.

  Further, the present invention relates to an image reading apparatus provided with a document conveying device, characterized in that the image reading device is inclined with the document discharge portion of the document conveying device facing downward.

  In addition, when the image reading apparatus is installed on the image forming apparatus, a sheet mounting table on which an output sheet of the image forming apparatus is stacked is disposed inside the image forming apparatus and is disposed below the image reading apparatus. The present invention relates to an image reading apparatus including a document conveying device.

  As described above, according to the image reading apparatus equipped with the automatic document feeder of the present invention, when performing fixed document reading, only the document feed tray including the document crimping plate is lifted and the document is placed on the platen glass. Since it is only necessary to set and close the document crimping member again, the user does not have to perform the opening / closing operation at the same time for the conveyance unit that does not require a function during fixed reading. Therefore, the operability is lightened by the weight of the transport unit of the conventional automatic document feeder, and operability is greatly improved not only for general users but also for disability users.

  For this reason, the rotating hinge can have a very simple configuration without the need for a damper, a strong spring, or the like in order to prevent the document pressing member and the document feeding tray from suddenly falling by its own weight. The cost of the rotating hinge is also reduced.

  Also, in document scanning, if dust adheres to the upper surface of the platen glass, there is a problem that the dust adhering to the scanner reading section appears as image streaks. When the original is set, the document transport unit is integrated with the image reading unit, so it is not necessary to open and close the transport unit, and only the document feed tray is opened and closed. The occurrence of image streaks is reduced, and the occurrence of image streaks is less likely to occur.

  Further, since the originals are discharged and stacked on the inclined platen glass at the time of the original flow reading, the configuration of the original discharge tray is not required without deteriorating the original stackability, thereby simplifying the configuration. . In the image forming apparatus, an output paper discharge tray disposed inside the image forming apparatus main body for stacking image-formed sheet materials has an image reading unit disposed at the upper side inclined toward the takeout side. Since it is arranged in such a configuration, it is possible to increase the capacity with respect to the stacking height of sheets and stack more sheets. Furthermore, since the space of the take-out port when taking out the sheet material was widened, the take-out property of the sheet was also improved.

  Embodiments of the present invention will be described in detail with reference to the drawings. In the following embodiment, an example in which the present invention is applied to an electrophotographic image forming apparatus (copier) will be described.

  First, with reference to FIG. 4, the overall configuration of a copying machine 1000 as an embodiment of the present invention will be described. FIG. 4 is a front sectional view of a copying machine as an embodiment of the present invention. As shown in FIG. 4, the copier 1000 includes a printer unit 300 having an image forming unit 301 that forms an image on a sheet disposed below, and an image of an original document that is disposed above and inclined upward. An image reading unit 100 to be read, and a discharge sheet stacking tray 316 that discharges and stacks sheets on which images have been formed by the printer unit 300 disposed between the printer unit 300 and the image reading unit 100 are provided. A document conveying unit 200 that feeds the document to the reading position is integrally formed on the upper left side of the image reading unit 100.

(Description of printer section)
As shown in FIG. 4, the printer unit 300 includes an image forming unit 301 and a sheet feeding unit 302 that feeds sheets to the image forming unit 301. In the copier 1000, a housing is used as a sheet feeding unit. Four cassette feeding sections 303A, 303B, 303C, and 303D are provided from the lowermost side of the body.

  Each of the cassette feeding units 303 </ b> A to 303 </ b> D of the printer unit 300 includes a sheet stacking cassette 304 that is detachable from the printer unit 300 and a pickup roller that picks up the uppermost sheet stacked in the sheet stacking cassette 304. 305, a separation roller pair 306 that separates the sheet picked up by the pickup roller 305 into one sheet, and a conveyance roller pair 307 that conveys the sheet separated into one sheet by the separation roller pair 306 to a sheet conveyance path continuous with the image forming unit 301. have. The sheets fed by the respective cassette feeding units 303 </ b> A to 303 </ b> D are conveyed to the image forming unit 301 by a conveyance roller pair 308 disposed in the sheet conveyance path.

  In the printer unit 300, at the time of an image forming operation, a sheet is fed to the image forming unit 301 by one of these feeding units 303A to 303D under the control of a CPU (not shown). .

  The image forming unit 301 of the printer unit 300 forms an image of a document read by the image reading unit 100 on a sheet by an electrophotographic method. As shown in FIG. 4, the image forming unit 301 includes a laser scanner 309 that emits laser light corresponding to the image information of the document read by the image reading unit 100, and the feeding operation so as to synchronize with the image forming operation. A registration roller 310 that conveys the sheet fed by the printing unit, a photosensitive drum 311 that forms an electrostatic latent image based on laser light emitted from the laser scanner 309, and transfer charging that charges the surface of the photosensitive drum 311. A developing device 313 for developing an electrostatic latent image on the photosensitive drum 311, a fixing device 314, and the like.

  In the image forming unit 301, laser light corresponding to the image information of the document is emitted from the laser scanner 309 and scanned on the surface of the photoconductive drum 311, thereby electrostatic latent image on the surface of the uniformly charged photoconductive drum 311. An image is formed. The electrostatic latent image is developed by the developing unit 313, whereby a toner image is formed on the photosensitive drum 311.

  Further, the toner image on the photosensitive drum 311 is transferred by the transfer charger 312 to the sheet sent by the registration roller 310 that rotates in synchronization with the rotation of the photosensitive drum 311. Transferred to the first surface. The sheet on which the toner image has been transferred is conveyed to the fixing device 314, and is heated and pressurized by the fixing device 314, whereby the toner image on the sheet surface is fixed. The sheet on which the toner image has been fixed by the fixing device 314 of the image forming unit 301 is discharged from the sheet discharge unit 315 to the discharge sheet stacking tray 316 via the conveyance path. The discharge sheet stacking tray 316 has an upwardly inclined structure so as not to deteriorate the stackability of discharge sheets. In addition, since the image reading device above the discharge sheet stacking tray is also inclined to the right, the conventional discharge sheet stacking area is increased in the area D in the figure, and more sheets can be stacked. It became. Further, when the user inserts his / her hand from the right side in the figure to take out the discharged sheet, the outlet is widened by the height of E in the figure, and the dischargeability of the discharged sheet is improved as compared with the conventional case.

(Description of image reading unit)
Next, the configuration of the image reading unit 100 will be described with reference to FIG.

  FIG. 5 is a cross-sectional view of the image reading unit and the document conveying unit, and FIG. 6 is a top view of the image reading unit. 101 is a casing, 102 is a platen glass for loading a document that is fixed to the top of the casing and a document is stacked on the top surface, and 103 is a document pressing plate having a sponge for pressing the loaded document onto the platen glass 102. , 104 includes an image sensor 105 inside, and a reading device capable of reciprocating a predetermined distance by driving means described later, and 106 is a size index indicating the size of the document loaded on the platen glass 102.

  When performing document scanning, the reading device 104 moves to a reading position e in FIG. 5 and reads an image of the document passing through the document feeding device 200 through the scanning glass.

  Further, the case of performing original fixed reading will be described with reference to FIGS. The reading device 104 moves in the direction of arrow B by a distance corresponding to the document size detected by the document size detection means (not shown) from the home position (position d in the figure) below the size index 106, and moves to the platen glass 102. The image of the placed document (book document) is read. Reference numeral 109 denotes a guide rail provided in the casing 101 for guiding the reading device 104 that reciprocates, and reference numeral 110 denotes a motor that is a driving source for causing the reading device 104 to reciprocate. The motor 110 is coupled to a drive gear pulley 111, and the pulley 111 is coupled to the driven pulley 113 in a ring shape by a timing belt 112. Further, the timing belt 112 is coupled with a housing 115 that holds the image sensor 105 to run the reading device 104. As a result, the reading device 104 can reciprocate in the direction of the arrow shown in FIG. 6 by forward / reverse rotation of the motor 110 to read the image of the document (book document) placed on the platen glass 102 with the reading device 104.

(Description of the document feeder)
Next, with reference to FIG. 7, the document conveying portion of this embodiment will be described.

  The document conveying unit 200 is configured to read a document image by document scanning.

  A feed roller 206 is provided above the document feed tray 201 and feeds the document P in accordance with the rotational driving of the separation transport roller 209. A feeding roller 206 sequentially feeds a plurality of documents from above. The feeding roller 206 is normally retracted above the home position (a broken line position in the figure) so as not to interfere with the operation of setting a document. A shutter 207 serves as an abutment when the original P is set. The shutter 207 is linked to the arm of the paper feed roller, and is held at the position shown in the drawing when the paper feed roller is upward. When the paper feed operation is started, the shutter 207 is retracted upward to enter the entrance of the document P. Is released. When the feeding operation is started, the feeding roller 206 is lowered to the position indicated by the solid line in the drawing and comes into contact with the upper surface of the document P. The feed roller 206 is pivotally supported by an arm (not shown), and is moved up and down by swinging the arm. Next, the fed document P reaches the separation unit. The separation unit is provided with a separation conveying roller 209 and a separation pad 211 for separating the originals P one by one, and generates a predetermined separation pressure. The separation pad 211 is formed of a rubber material or the like whose friction is slightly smaller than that of the separation conveyance roller 209. The separation conveying roller 209 is driven in the direction of feeding the document (clockwise in the figure), and the separation pad 211 generates a frictional force in the direction of returning the document, thereby separating the document P one by one and feeding it. To do.

  The separated document P is sent to a registration roller 215 and a registration driven roller 214 as registration means. The leading edge of the document P separated and fed is brought into contact with the nip portion of the stationary registration roller 215 and the registration driven roller 214 to generate a loop, thereby aligning the leading edges of the documents. Thereby, skew during reading can be corrected. Then, the registration roller 215 is driven to convey the original P downstream.

  The document P is guided by the read roller 217 and the driven roller 218 toward the flow reading glass 108 where the reading device 104 is moving downward, and reading of the document is started while being held between the platen roller 220 and the flow reading glass 108. To do. When the reading is completed, the sheet is discharged from the reading unit by the conveying roller 222 and the driven roller 221. During reading of the document P, the read roller 217 and the transport roller 222 are driven with stable rotation, and the image of the moving document P is read by the fixed reading device 104.

  The reading of the original P is completed, and the original P is discharged onto the platen glass 102 and stacked by the discharge roller 224 and the driven roller 225. Since the originals discharged at this time are tilted by the image reading apparatus 100, the platen glass to be discharged and stacked is also inclined to prevent a stacking failure caused by feeding the discharged originals.

  As described above, since the original is discharged and stacked on the platen glass, the structure of the original discharge tray is not required as in the prior art.

  Further, since the flow-reading glass 108 is configured inside the original conveying unit 200 that is integrated with the image reading unit 100, it is exposed to the user at the time of the conventional fixed original reading, and the glass against the black streak problem. Although there is concern about dirt, in this embodiment, the original fixed reading can be performed simply by opening and closing the document feed tray 201, and therefore the glass stain on the flow reading glass 108 by the user operation is reduced.

  Here, the document feed tray 201 will be described with reference to FIG. 8 (front view) and FIG. 9 (upper view).

  As shown in FIGS. 8 and 9, the document feed tray 201 is attached to both sides of the document transport unit 200 and is located above the image reading unit. The document feed tray 201 according to the embodiment of the present invention is used to stack a plurality of documents for reading images, and also has a function of pressing a fixed-read document.

  The document feed tray 201 is positioned upward as indicated by the solid line in FIG. 8 in the case of document flow reading, and in the case of fixed document reading, it is lowered as indicated by the broken line in FIG. To fix the original.

  The configuration of the document feed tray 201 is rotatable with the rotation shafts 203 on both sides of the document transport unit 200, and a pair of width direction regulating plates 202 is provided on the upper surface side of the document feed tray. It is arranged to be slidable in the direction. The width direction restricting plate 202 ensures document conveyance stability during feeding. In addition, an auxiliary tray 226 having a pivot fulcrum 205 is attached to the right end portion of the document feed tray 201 in order to improve the document setting property at the time of fixed reading and the discharged document removal property at the time of flow reading. As shown by a two-dot chain line in FIG. However, when the document feed tray 201 is positioned above the solid line in FIG. 8, the rotation angle of the auxiliary tray 226 on the right side of the rotation fulcrum 205 is inclined with respect to the platen glass 102 of the image reading unit. The rotation angle is regulated so as not to rotate downward from the parallel angle. Further, a document pressing plate 107 is provided on the lower surface side of the document feeding tray. The original pressing plate 107 has a white coating material on the surface and a sponge inside, and is attached to an area covering the platen glass.

  The peripheral configuration of the rotation shaft 203 of the document feed tray 201 will be described with reference to FIG. The arm 227 having a circular arc at the tip rotates about the rotation shaft 203 in accordance with the rotation of the document feed tray 201. A step 228 is provided on the outer peripheral sliding surface of the end of the arm 227, and the document feeding tray 201 is placed on the upper surface side of the document setting surface by the interference with the protrusion 230 of the stopper lever 229 that is always in contact with the step 228. Rotation is lightly constrained at a position where the paper feed opening and the paper feed opening are adjacent to each other. The stopper lever 229 is always in contact with the arm sliding surface of the document feed tray because the stopper lever 229 has one end as a fulcrum and the other end is constantly pressed from below by a compression spring 231. When the document feed tray is rotated downward, the protrusion 230 of the stopper lever 229 is released from the step 228 on the arm sliding surface by pushing the left end portion of the stopper lever 229 downward, so that the document feed tray is It can be rotated downward by its own weight. Therefore, in this configuration, when performing an operation of pressing the document with the document pressing plate in the fixed document reading, the operation can be performed with one touch by the release operation of the stopper lever 229. Further, the spring pressure of the compression spring 231 is set so as to be an operation force that can be comfortably performed by the user to release the stopper lever, and a sudden force or an excessive load is applied to the upper surface of the document feed tray. In this case, the step of the arm is set to a spring pressure capable of releasing the stopper lever, thereby preventing breakage due to a sudden load on the document feeding tray.

  In this embodiment, the document feeding tray is rotated by a user operation. However, the document feeding tray may be rotated by a drive system or a motor. With such a configuration, it is possible to automate the crimping operation of the crimping plate by the document feeding tray.

  In the configuration of this embodiment, the document conveying unit and the image reading unit are integrated, and the document pressing plate and the document feeding tray are shared. For this reason, when performing a fixed reading, the user only opens and closes the relatively light original document feed tray without opening and closing the conventional document transport device. Became easier. In addition, since the structure of the rotation hinge itself that maintains the rotation performance of the document conveying section and the structure of the damper and the strong spring are not required and the structure is very simplified, the cost is reduced.

  FIG. 11 shows a drive system showing sensors in the document conveying section and motors for driving each roller and the like.

  Next, description will be given of sensors in the document conveying unit. In FIG. 11, the document feed tray 201 detects the position of the document set detection sensor S <b> 1, which is a transmissive optical sensor that detects that the document P is set, and the width direction regulating plate 2, and detects the position of the document P A document width detection sensor S5 (not shown) for detecting the length of the document is provided. Further, a registration sensor S2 which is a transmission type optical sensor for detecting a document is provided between the separation roller 209 and the registration roller 215. The leading edge of the separated and fed document is detected, and the amount of contact with the registration roller 215 is detected. The timing for controlling the (loop amount) is detected. A lead sensor S3, which is a reflection type optical sensor for detecting a document, is provided immediately before the lead roller 217, and serves as a reference signal for reading start timing at the reading position. Further, immediately before the discharge roller 224, a discharge sensor S4, which is a transmissive optical sensor for detecting a document, is provided to detect the document discharge timing and the like.

  Next, the drive system will be described. In FIG. 11, a separation motor M1 is a stepping motor that drives a separation roller and a pick roller. The separation motor M1 feeds and conveys the original P by rotating the separation roller and the pick roller clockwise. When the pick roller is lifted upward, the separation motor M1 rotates by a certain amount in the direction opposite to that during paper feed and the pick roller swings upward about the separation roller shaft. The read motor M2 is a stepping motor that drives the registration roller 215, the lead roller 217, and the conveyance roller 222. Each roller is driven at a speed for reading the image of the conveyed document. The discharge motor M3 is a stepping motor that drives the discharge roller 224.

  FIG. 12 is a block diagram illustrating a configuration of a control circuit of the document conveying unit 200. The control circuit is configured around a CPU 61 (microprocessor), and drive circuits and sensor signals for various loads are connected to the input / output ports of the CPU 61. The control circuit also includes a RAM backed up by a battery (not shown) and a ROM storing control sequence software. Further, a communication IC 62 for controlling data communication with the CPU 316 of the printer unit 300 is connected to the CPU 61.

  The separation motor M1, the lead motor M2, and the discharge motor M3 are driven by each stepping motor driver. Each driver receives a phase excitation signal and a motor current control signal from the CPU 61. Various sensors such as a document set detection sensor S1, a registration sensor S2, a read sensor S3, a discharge sensor S4, and a document width detection sensor are connected to the input port of the CPU 61 to detect the behavior of the document in the apparatus and the behavior of the movable load. Used for monitoring.

Sectional drawing which shows the whole structure of the image forming apparatus of a prior art example. Sectional drawing which shows the structure of the image reading apparatus provided with the automatic document feeder of the prior art example. FIG. 9 is a left side view of an image reading apparatus provided with a conventional automatic document feeder. 1 is a front sectional view of a copier that is an embodiment of the present invention. Sectional drawing of an image reading part and a document conveyance part. The top view of an image reading part. Sectional drawing of an image reading part and a document conveyance part. FIG. 3 is a front view of an image reading unit and a document conveying unit. FIG. 3 is a top view of an image reading unit and a document conveying unit. FIG. 3 is a detailed view of an attachment portion of a document feed tray. FIG. 3 is a layout diagram of sensors and drive system motors of a document conveying unit. FIG. 3 is a block diagram of a control system circuit of a document conveying unit.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Automatic document conveying apparatus 2 Image reading apparatus 3 Image forming apparatus 100 Image reading part 101 Case 102 Platen glass 104 Reading apparatus 105 Image sensor 106 Size index 107 Original crimping plate 108 Flow-reading glass 200 Original conveying part 201 Original feeding tray 204 Eccentric cam 206 Feeding roller 207 Shutter 209 Separating roller 211 Separating pad 222 Conveying roller 224 Discharging roller 217 Lead roller 220 Platen roller 222 Conveying roller 224 Discharging roller 226 Auxiliary tray 229 Stopper lever
S1 Document set detection sensor
S2 resist sensor
S3 lead sensor
S4 Discharge sensor
S5 Document width detection sensor
M1 separation motor
M2 lead motor
M3 discharge motor

Claims (4)

An image including an original conveying device and an image reading device, and an original conveying device capable of performing both an original document reading operation for reading an image while conveying an original document by the original conveying device and an original fixed reading operation. In the reader,
A paper feeding document placing table on which a document to be fed by the document conveying device is placed; a platen glass placed on the image reading device for setting a document for fixed document reading; and the paper feeding document A pressure plate disposed on the back surface of the mounting table for pressing the original set on the platen glass to the platen glass during original fixed reading and a lower part of the platen glass. And a reading section for reading an image by document scanning, and the feed document placing table is rotatable with a certain rotation center. It is characterized in that it is rotated so that the document placing table is adjacent to the vicinity, and is rotated so that the pressure plate comes into contact with the platen glass at the time of document fixed reading.   2. An image reading apparatus comprising the document conveying device according to claim 1, wherein the document which has been fed and read by the document conveying device during document scanning is discharged onto the platen glass. To do.   According to a second aspect of the present invention, there is provided the image reading apparatus including the document conveying device, wherein the image reading device is configured to be inclined with the document discharge portion of the document conveying device facing downward.   4. An image reading apparatus comprising the document conveying device according to claim 3, wherein a sheet placement table on which an output sheet of the image forming apparatus is stacked when the image reading apparatus is installed on the image forming apparatus. It is arranged below the image reading device.

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