JP2017024818A - Sheet conveyance device and image reading apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sheet conveyance device and an image reading apparatus capable of suitably conveying a sheet even when charged with a static electricity.SOLUTION: The sheet conveyance device includes conveyance means for conveying a sheet along a conveyance passage, control means for controlling a drive of the conveyance means, and a detection means for detecting a charged state in the conveyance passage during conveying the sheet. The control means changes a driving condition of the conveyance means on the basis of the detection result by the detection means. Discharge means for discharging the sheet from the conveyance passage is also provided, and the detection means is arranged in the upstream side of the discharge means in the conveyance direction in the conveyance passage. The control means may change the driving condition of the discharge means on the basis of the detection result by the detection means.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a sheet conveying apparatus or an image reading apparatus used for, for example, a facsimile, a copying machine, a printer, and the like.

  In a conventional image forming apparatus such as a copying machine or a facsimile, or an image reading apparatus, a transport roller that separates stacked documents and transports them one by one, and an image that reads a document transported by the transport rollers at a predetermined position. And a reading sensor.

  In the image reading apparatus having such a document conveying device, the friction between the contact glass of the image reading sensor and the document when the document is separated and conveyed, when the rubber roller that separates and conveys the document slips or when the image of the document is read. Sometimes static electricity can be generated. If the generated static electricity accumulates on the original, the separation performance of the original deteriorates, and when the original is discharged, the preceding original and the subsequent original come into contact with each other, and the discharge alignment deteriorates. To do.

  For this reason, the rubber roller is made conductive, and the roller shaft is made of metal, and a ground plate is brought into contact with the metal roller shaft, thereby removing static electricity by grounding the rubber roller and the charged static electricity. Technology is known. There is also known a technique for removing static electricity by bringing a static eliminating brush into contact with a document in which static electricity has accumulated or a document reading unit. Further, a technique for removing static electricity generated in the main body of the image reading apparatus by detecting the amount of charge in the main body of the image reading apparatus and injecting ions onto the original reading unit or the original according to the amount of charge is also known. Yes.

JP 2002-77532 A

  However, in the above-described technology for removing static electricity accumulated in the image reading apparatus main body or the original, the static electricity may not be sufficiently removed. When a document whose static electricity has not been sufficiently removed is discharged, the document may float in the air when the document is discharged, and it may take a long time to be placed on the discharge tray. At this time, if the succeeding document comes into contact with the trailing edge of the preceding document before the preceding document is placed on the discharge tray, there is a problem that the discharge alignment is deteriorated or the order of discharging is out of order. May also occur. In any case, if the sheet is charged, various inconveniences occur.

  The present invention provides a sheet conveying apparatus and an image reading apparatus capable of conveying a sheet satisfactorily even when static electricity is charged.

The sheet conveying apparatus of the present invention includes a conveying unit that conveys a sheet along a conveying path, a control unit that controls driving of the conveying unit, and a detecting unit that detects a charged state in the conveying path during sheet conveyance. The control means changes the driving condition of the transport means based on the detection result of the detection means.
According to this aspect of the present invention, by changing the driving condition of the conveying means based on the result of detection of the charged state by the detecting means, it becomes possible to carry the sheet well even when charged by static electricity. .

In the present invention, the image forming apparatus further includes a discharge unit that discharges the sheet from the conveyance path, wherein the detection unit is arranged on the upstream side of the discharge direction with respect to the discharge unit in the conveyance path, and the control unit The driving condition of the discharging unit may be changed based on the detection result of the detecting unit.
According to this aspect of the present invention, the sheet discharge alignment can be adjusted by changing the drive condition of the discharging means based on the charged state before discharging the sheet.

In the present invention, the control unit further includes a mounting table on which the sheet bundle is stacked, and a feeding unit that feeds one sheet at a time from the sheet bundle on the mounting table to the conveyance path. May control the interval between the preceding sheet and the succeeding sheet by controlling the driving of the feeding means or the conveying means based on the detection result of the detecting means.
According to this aspect of the present invention, it is possible to efficiently carry out continuous conveyance by controlling the sheet interval within a predetermined range.

In the present invention, a plurality of detection means may be provided to detect the charged state at a plurality of locations in the transport path.
According to this aspect of the present invention, a change in the charged state can be detected and fed back to various controls.

The image reading apparatus according to the present invention further includes a conveying unit that conveys the sheet along the conveying path, an image reading unit that reads an image of the sheet conveyed in the conveying path, and a control that controls driving of the conveying unit. And a detection unit that detects a charged state in the conveyance path during sheet conveyance, and the control unit changes a driving condition of the conveyance unit based on a detection result of the detection unit. And
According to this aspect of the present invention, by changing the driving condition of the conveying unit based on the result of detection of the charged state by the detecting unit, even when static electricity is charged, the sheet can be conveyed and the image can be read satisfactorily. Is possible.

The image reading apparatus according to the present invention includes a sheet placement table on which a document to be read such as a document is placed, and a pickup roller as a sheet feeding unit that draws the document loaded on the sheet placement table into the image reading apparatus. A sheet feeding device having a sheet feeding device, a feeding roller that feeds a document to an image reading unit that reads an image of the document, and a pressure-contacted to the feeding roller in a direction in which the fed document is conveyed upstream when there are a plurality of documents. A separation roller that rotates and conveys the document to the upstream side, a pair of conveyance rollers that conveys the document after separation and conveyance from the document reading position to the discharge position, and a pair of discharge rollers that discharge the document to the outside of the apparatus A discharge tray on which the document that has been read is placed, a detection unit that detects a charge amount in the document or the image reading apparatus main body, or both, and a charge amount detected by the detection unit And control means for controlling the rotational speed of any one of the rollers, characterized by comprising a.
According to this aspect of the present invention, by controlling the driving conditions of the conveying unit based on the result of detection of the charged state by the detecting unit, the sheet can be conveyed and read well even when static electricity is charged. Is possible.

In the present invention, the detection unit may be provided in the vicinity of the upstream side of the pair of paper discharge rollers.
According to this aspect of the present invention, the sheet discharge alignment can be adjusted by controlling the driving condition of the discharging unit based on the charged state before discharging the sheet.

In the present invention, the interval between the conveyed originals may be controlled in accordance with the charge amount detected by the detection unit.
According to this aspect of the present invention, the sheet interval can be controlled within a predetermined range, and the conveying process and the reading process can be performed efficiently and continuously.

Further, in the present invention, a plurality of the detection means are provided in the image reading apparatus, and the feeding roller, the separation roller, and the like according to the respective charge amounts detected by the charge detection means and the maximum value of the charge amount, It is good also as controlling at least one roller rotation speed among the conveyance roller pair and the discharge roller pair.
According to the present invention, sheet conveyance can be adjusted by controlling the rotational speed of any roller based on the charged state.

  According to the present invention, it is possible to realize a sheet transport apparatus and an image reading apparatus that can transport a sheet satisfactorily even when charged by static electricity.

1 is a configuration diagram schematically illustrating an image reading apparatus according to a first embodiment of the present invention. FIG. 3 is a flowchart of sheet spacing control in Embodiment 1 of the present invention. FIG. 3 is a configuration diagram schematically illustrating an image reading apparatus according to a second embodiment of the present invention. FIG. 9 is a flowchart of sheet interval control in Embodiment 2 of the present invention. FIG. 5 is a configuration diagram schematically illustrating an image reading apparatus according to a third embodiment of the present invention. FIG. 9 is a flowchart of sheet spacing control in Embodiment 3 of the present invention. Schematic which shows an example of the charge detection sensor in each embodiment of this invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
(Embodiment 1)
FIG. 1 is a configuration diagram of an image reading apparatus according to Embodiment 1 of the present invention.
As shown in FIG. 1, the image reading apparatus according to the present embodiment includes a document placing table 2 on which a document D to be read such as a document is placed, and separate documents from the bundle of documents one by one into the apparatus. Separating and feeding means (11, 12, 13), conveying means (14) for conveying the separated and fed document downstream, discharging means (14) for discharging the document D out of the apparatus, and discharging And a paper discharge tray on which the original D to be loaded is loaded.

  Specifically, the separation feeding unit is pressed against the pickup roller 11 that pulls the document D of the document table 2 into the apparatus, the feeding roller 12 that separates the document D one by one, and the feeding roller 13. And a separation roller 12 that generates a separation load. For example, the separation roller 12 of this embodiment includes a torque limiter (not shown), and rotates only in the direction in which the feed roller 12 feeds when a load exceeding the limit value is applied. Otherwise, a separation load is generated. Then, it works so as to comb the original one by one from the original bundle.

  Further, the conveying means arranged downstream of the separating and feeding means in the conveying direction has a plurality of conveying roller pairs 14 arranged along the conveying path, and along the conveying path through these conveying roller pairs 14. Documents can be conveyed. Although not shown, one drive roller of each transport roller pair 14 is rotated by receiving power transmission from a drive source, and the other roller is a driven roller that is driven by the drive roller.

  Further, in the present embodiment, among each pair of transport rollers 14, between the transport roller pair 14 immediately after the separation feeding unit and the transport roller pair 14 disposed next to the transport roller pair 14, An image reading unit 16 for reading an image is disposed substantially opposite to the conveyance path. That is, an image on one side or both sides of the original is read in the process of passing the original between the image reading units 16 arranged opposite to each other.

  Further, in the present embodiment, the document whose image has been read by the above-described image reading unit 16 is transported along a U-turn-shaped transport path, and thereafter, a discharge unit (15 provided near the exit of the transport path). ) And then discharged onto a paper discharge tray through a discharge means.

  Here, the discharge means is constituted by a discharge roller pair 15 provided at the exit of the conveyance path. Note that one drive roller of the discharge roller pair 15 rotates in response to power transmission from a drive source (not shown), and the other roller is a driven roller driven by the drive roller, similarly to the above-described transport roller. .

  Further, the above-described pickup roller 11, feeding roller 12, each conveyance roller pair 14, and discharge roller pair 15 are connected to a drive source such as one or a plurality of drive motors (not shown), and from the drive source to each roller. Power transmission is controlled by a control unit (CPU or the like).

  Here, for example, in the case of one drive motor, power transmission may be controlled by switching connection of a clutch or the like with a drive source for the roller to be connected, or each roller may be independently operated. You may make it drive-control by connecting with a some drive motor so that it can drive.

  That is, each roller may be individually driven independently, or the feeding roller 12, the transport roller pair 14, and the discharge roller pair 15 may be separate drive sources. When connection control is performed using a clutch or the like, the operation of the clutch may be controlled. Or when controlling a separate drive source, you may carry out individual control by a separate control part, and you may control by centralized management by one control part.

  By the way, as in the present embodiment, static electricity is generated during the taking-in of the original by the pickup roller 11 from the upper surface side of the original bundle, or friction between the originals when the original is separated, or the conveyance path after the original is separated. Static electricity is also generated when the inner wall of the conveyance path and the document come into sliding contact with each other during the conveyance along the line. For this reason, static electricity is generated due to friction in various situations of taking in, separating, or conveying a document, and it is charged.

  For example, in the present embodiment, for example, a charge detection sensor (a detection unit that detects a charged state) 21a is provided between the pickup roller 11 and the feed roller 13, and based on the detection result, the subsequent separation feed, At least one drive of conveyance or discharge is controlled. In particular, in the present embodiment, based on the result of charge detection, control is performed so that the interval between the separated preceding document and the succeeding subsequent document is longer than the minimum interval.

  It should be noted that a static eliminating brush or the like may be disposed in a portion where static electricity is generated to prevent charging, but it may not be sufficiently removed. Therefore, as in the present embodiment, in the feeding region where static electricity is likely to be generated due to friction, the charge detection sensor 21a is provided as described above, and based on the detection result of the charge detection sensor 21a, separation feeding or subsequent conveyance is performed. It is preferable that the distance between the preceding document and the succeeding document be equal to or longer than a predetermined length.

  Here, in this embodiment, the feed roller 13, the transport roller pair 14, and the paper discharge roller pair 15 are connected to separate drive sources so that each can be controlled independently. The image reading apparatus is connected to a computer (not shown). In the present embodiment, each of the above-described rollers is made of rubber.

  Further, as described above, a charge detection sensor (charge detection means) for detecting the amount of charge in the document and the apparatus is disposed in the vicinity of the pickup roller 11. The charge detection sensor (charge detection means) is connected to a control unit (not shown) that controls the rotation speeds of the feed roller 13 and the discharge roller pair 15.

  Hereinafter, with reference to FIG. 2, the sheet interval control in the present embodiment will be described. FIG. 2 shows a flowchart of the paper gap control. In FIG. 2, first, when the user places a document D on the sheet placing table 2 of the image reading apparatus (YES in step S201), the charge detection sensor 21a is disposed by the charge detection sensor 21a disposed in the vicinity of the pickup roller 11. A charge amount of a nearby document is detected (step S202). If the amount of charge detected at this time is equal to or less than a predetermined threshold value (YES in step S202), the sheet interval is fed and conveyed with normal settings (step S203).

  If the amount of charge detected in step S202 is equal to or greater than the threshold (NO in step S202), the feeding roller 13 is controlled to widen the interval between the conveyed originals and feed and convey (step S204). ). For example, as a method of widening the interval between the conveyed originals, the ON / OFF timing of the driving of the feeding roller 13 is the same as the normal setting, and the rotation speed of the feeding roller 13 is made slower than the normal setting or the feeding is performed. The rotation speed of the roller 13 is the same as the normal setting, and the timing at which the driving of the feeding roller 13 is turned on is delayed.

  As described above, in this embodiment, by increasing the interval between the conveyed originals, the time from when the preceding original is discharged until the subsequent original is discharged becomes longer, and the preceding original with a large amount of charge is in the air. Even if it floats, the preceding document is placed on the discharge tray 3 before the subsequent document is discharged. Therefore, the succeeding document can be discharged without contacting the trailing edge of the preceding document. Thus, it is possible to suppress the occurrence of problems such as the leading document and the succeeding document coming into contact with each other and deteriorating the discharging alignment, and the discharging order being out of order, and the discharging alignment can be maintained.

  Further, the amount of decrease in the rotation speed of the feeding roller 13 and the timing for turning on the driving of the feeding roller 13 from OFF to ON are determined according to the detected charge amount. That is, as the detected charge amount increases, the rotation speed of the feed roller 13 is slowed so that the interval between the transported documents is widened, or the timing at which the drive of the feed roller 13 is turned on is delayed. . As a result, it is possible to prevent the discharge alignment from deteriorating due to an insufficient amount of increase in the interval between the conveyed originals, or a decrease in the conveyance speed more than necessary due to an excessive increase in the interval between the conveyed originals.

(Embodiment 2)
The configuration of the image reading apparatus according to the second embodiment of the present invention shown in FIG. 3 is the same as that of the first embodiment except for the arrangement position of the charge detection sensor (charge detection means).

  In the image reading apparatus of the present embodiment, as shown in FIG. 3, the document and a charge detection sensor (charge detection means) for detecting the charge amount in the apparatus are arranged in the vicinity of the upstream side of the paper discharge roller pair 15. The number of the charge detection sensors (charge detection means) in the width direction of the document may be one in the center of the document. However, if a plurality of charge detection sensors (charge detection means) are arranged in accordance with the maximum width of the document D through which the image reading device passes. It is effective. The charge detection sensor (charge detection means) is connected to a control unit (not shown) that controls the rotation speeds of the feed roller 13 and the discharge roller pair 15.

  FIG. 4 is a flowchart of the sheet interval control in the second embodiment. In FIG. 4, first, when the user places a document D on the sheet placing table 2 of the image reading apparatus (YES in step S401) and instructs to start scanning (YES in step S402), the document is fed and conveyed. The process is started (step S403).

  Then, when the document passes through the feeding roller 13, the reading unit 16, and the conveying roller pair 14 and comes on the charging detection sensor 21b provided on the upstream side of the discharge roller pair 15, the charging detection sensor 21b detects the charging. The charge amount of the image reading apparatus and the document D in the vicinity of the sensor 21b is detected (step S404). If the amount of charge detected at this time is equal to or less than a predetermined threshold value (YES in step S404), paper feeding and conveyance are performed with normal settings between the sheets (step S405). If the detected charge amount is equal to or greater than the threshold value (NO in step S404), the feeding roller 13 and the discharge roller pair 15 are controlled to widen the interval between the conveyed originals and feed and convey ( Step S406). As a method for widening the interval between transported originals, there is a method in which the originals are held by a pair of paper discharge rollers 15 after the image of the originals is read.

  In this embodiment, by increasing the interval between transported documents, the time from when the preceding document is discharged until the subsequent document is discharged becomes longer, and even if the preceding document with a large amount of charge floats in the air. The preceding document is placed on the sheet discharge tray 3 before the subsequent document is discharged. Therefore, the subsequent document does not come into contact with the trailing edge of the preceding document. As a result, it is possible to suppress the occurrence of problems such as the leading document and the succeeding document coming into contact with each other and the discharge alignment being deteriorated or the discharge order being out of order.

  The rotation speed of the feeding roller 13 and the discharge roller pair 15 is determined according to the detected charge amount. That is, the rotation speed of the feeding roller 13 or the paper discharge roller pair 15 is decreased so that the interval between the conveyed originals becomes wider as the detected charge amount increases. As a result, it is possible to prevent the discharge alignment from deteriorating due to an insufficient amount of increase in the interval between the conveyed originals, or a decrease in the conveyance speed more than necessary due to an excessive increase in the interval between the conveyed originals.

(Embodiment 3)
The configuration of the image reading apparatus according to the third embodiment of the present invention shown in FIG. 5 is the same as that of the first and second embodiments except for the arrangement position of the charge detection sensor (charge detection means). In the present embodiment, charge detection sensors (charge detection means) for detecting the amount of charge in the document and the apparatus are arranged at two locations near the pickup roller 11 and near the upstream side of the paper discharge roller pair 15.

  The number of the charge detection sensors (charge detection means) in the width direction of the document may be one in the center of the document. It is effective. The charge detection sensor (charge detection means) is connected to a control unit (not shown) that controls the rotation speeds of the feed roller 13 and the discharge roller pair 15.

  FIG. 6 is a flowchart of the sheet interval control in the third embodiment. In FIG. 6, first, when the user places a document D on the sheet placing table 2 of the image reading apparatus (YES in step S601) and instructs to start scanning (YES in step S602), the user places the document D in the vicinity of the pickup roller 11. The charge detection sensor 21c detects the charge amount of the document near the charge detection sensor 21c (step S603). If the amount of charge detected at this time is equal to or less than a predetermined threshold value (YES in step S603), sheet feeding and conveyance are performed with normal settings between the sheets (step S604). However, if the detected charge amount is equal to or greater than the threshold value (NO in step S603), paper feeding and transport are performed with the interval between transported documents widened according to the detected charge amount (step S605).

  When the gap between the sheets is kept at the normal setting (step S604), the document D passes through the reading unit 16 and the conveyance roller pair 14 and is on the charge detection sensor 21d provided near the upstream side of the sheet discharge roller pair 15. In step S606, the charge detection sensor 21d detects the charge amount in the image reading apparatus near the charge detection sensor 21d and the document D (step S606). If the detected charge amount is equal to or less than a predetermined threshold value (YES in step S606), the sheet gap is fed and conveyed with normal settings as it is (step S608). However, if the detected charge amount is equal to or greater than the threshold value (NO in step S606), paper is fed and transported with the interval between transported documents widened according to the detected charge amount (step S609).

  Further, when the paper interval is wider than the normal setting (step S605), the document D passes through the reading unit 16 and the conveyance roller pair 14, and is provided in the vicinity of the upstream side of the paper discharge roller pair 15. When the position reaches 21d, the charge detection sensor 21d detects the charge amount in the image reading apparatus near the charge detection sensor 21d and the document D (step S607). If the detected charge amount is equal to or less than a predetermined threshold value (YES in step S607), the sheet interval is returned to the normal setting, and paper feeding and conveyance are performed (step S610).

  By returning the sheet interval to the normal setting, it is possible to suppress a decrease in the number of conveyed sheets per unit time. However, if the detected charge amount is equal to or greater than the threshold value (NO in step S607) and the charge amount in the vicinity of the upstream side of the discharge roller pair 15 is greater than the vicinity of the pickup roller 11, the upstream side of the discharge roller pair 15 Depending on the charging amount in the vicinity, the distance between the conveyed originals is further widened to feed and convey. If the detected charge amount is equal to or greater than the threshold value (NO in step S607) and the charge amount in the vicinity of the upstream side of the discharge roller pair 15 is less than that in the vicinity of the pickup roller 11, the interval between the conveyed originals is not changed. (Step S611)

  Here, with reference to FIG. 7, an example of a charge detection sensor that can be suitably used in each of the first to third embodiments will be described in detail. In addition, in FIG. 7, the schematic block diagram of a charge detection sensor is shown. The charge detection sensor shown in FIG. 7 is a surface potential sensor. A magnetic field A having a strength proportional to the amount of charge is generated around the charged document. By arranging the charge detection sensor 21a (21b) in the vicinity of the magnetic field A, the strength of the magnetic field is detected. For example, the charge detection sensor 21a is covered with a metal case 211, and a detection electrode 212 is disposed therein. A through hole 213 is provided between the detection electrode 212 and the magnetic field detection region (magnetic field A), and a chopper 214 is provided between the through hole 213 and the detection electrode 212. When the charged document approaches the detection electrode, a charge proportional to the strength of the electric field is induced in the detection electrode 212 by electrostatic induction. The charge detection sensor 21a opens and closes the chopper 214 between the through-hole 213 and the detection electrode 212, takes out the induced charge as an AC signal, and detects the strength of the magnetic field. The detection electrode is converted into an AC voltage by impedance conversion 215, and the charged potential of the original is detected from the AC signal. In the present invention, such a surface potential sensor may not be used, and a method capable of detecting another charge amount may be employed.

  The present invention is not limited to the first to third embodiments, and various modifications can be made without departing from the scope of the invention. For example, the charge detection sensor (charge detection means) may be provided upstream or downstream of the reading unit. Static electricity removing parts, such as grounding static electricity on rubber rollers and documents, bringing static neutralization brushes into contact with static charged documents and document reading parts, and spraying ions on document reading parts and documents, etc. This is effective because the amount of static electricity in the document and the apparatus is reduced, but it may not be provided. In addition, it is preferable to provide the charge detection sensor in the vicinity of the feeding port in terms of performing subsequent conveyance control, but it may be provided immediately after separation.

D: Document, document bundle 2 ... Sheet placing table 3 ... Paper discharge tray 11 ... Pickup roller 12 ... Separation roller 13 ... Feeding roller 14 ... Conveying roller pair 15 ..Discharge roller pair 16: Reading units 21a, 21b, 21c, 21d ... Charge detection sensor (charge detection means)

Claims (9)

Conveying means for conveying the sheet along the conveying path;
Control means for controlling driving of the conveying means;
Detecting means for detecting a charged state in the conveyance path during sheet conveyance,
The sheet conveying apparatus, wherein the control unit changes a driving condition of the conveying unit based on a detection result of the detecting unit. A discharge unit for discharging the sheet from the conveyance path;
The detection means is arranged on the upstream side in the transport direction with respect to the discharge means in the transport path,
The sheet conveying apparatus according to claim 1, wherein the control unit changes a driving condition of the discharge unit based on a detection result of the detection unit. A mounting table on which sheet bundles are stacked;
A feeding means for feeding sheets one by one from the sheet bundle on the mounting table into the conveyance path;
The control means controls the interval between the preceding sheet and the succeeding sheet by controlling the driving of the feeding means or the conveying means based on the detection result of the detecting means. The sheet conveying apparatus according to 1.   4. The sheet conveying apparatus according to claim 1, wherein a plurality of the detection units are provided to detect a charged state at a plurality of locations in the conveyance path. 5. Conveying means for conveying the sheet along the conveying path;
Image reading means for reading an image of a sheet conveyed in the conveyance path;
Control means for controlling driving of the conveying means;
Detecting means for detecting a charged state in the conveyance path during sheet conveyance,
The image reading apparatus, wherein the control unit changes a driving condition of the transport unit based on a detection result of the detection unit. A sheet placing table on which a document to be read such as a document is placed;
A sheet feeding device having a pickup roller as a paper feeding means for drawing a document stacked on the sheet placing table into the image reading device;
A feeding roller for feeding the document to an image reading unit that reads an image of the document;
A separation roller that is in pressure contact with the feeding roller and rotates in a direction in which the document fed upstream is transported upstream, and transports the document back upstream;
A pair of transport rollers for transporting the separated transported document from the document reading position to the discharge position;
A pair of discharge rollers for discharging the document outside the apparatus;
A paper discharge tray on which scanned documents are placed;
Detection means for detecting the amount of charge in the document or the image reading apparatus main body, or both;
An image reading apparatus comprising: control means for controlling the rotational speed of any of the rollers based on the charge amount detected by the detection means.   The image reading apparatus according to claim 6, wherein the detection unit is provided in the vicinity of the upstream side of the pair of paper discharge rollers.   The image reading apparatus according to claim 6, wherein an interval between the conveyed originals is controlled in accordance with the charge amount detected by the detection unit.   A plurality of the detection means are provided in the image reading apparatus, and the feeding roller, the separation roller, the transport roller pair, and the discharge roller according to the respective charge amounts detected by the detection means and the maximum value of the charge amount. The image reading apparatus according to claim 6, wherein the rotational speed of at least one of the paper roller pairs is controlled.

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