US20060012104A1 - Automatic document feeder with anti-skew function - Google Patents
Automatic document feeder with anti-skew function Download PDFInfo
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- US20060012104A1 US20060012104A1 US11/109,655 US10965505A US2006012104A1 US 20060012104 A1 US20060012104 A1 US 20060012104A1 US 10965505 A US10965505 A US 10965505A US 2006012104 A1 US2006012104 A1 US 2006012104A1
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- Prior art keywords
- roller
- document
- feed
- feed roller
- documents
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H5/00—Feeding articles separated from piles; Feeding articles to machines
- B65H5/06—Feeding articles separated from piles; Feeding articles to machines by rollers or balls, e.g. between rollers
- B65H5/062—Feeding articles separated from piles; Feeding articles to machines by rollers or balls, e.g. between rollers between rollers or balls
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2220/00—Function indicators
- B65H2220/09—Function indicators indicating that several of an entity are present
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2301/00—Handling processes for sheets or webs
- B65H2301/50—Auxiliary process performed during handling process
- B65H2301/51—Modifying a characteristic of handled material
- B65H2301/512—Changing form of handled material
- B65H2301/5121—Bending, buckling, curling, bringing a curvature
- B65H2301/51212—Bending, buckling, curling, bringing a curvature perpendicularly to the direction of displacement of handled material, e.g. forming a loop
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2404/00—Parts for transporting or guiding the handled material
- B65H2404/10—Rollers
- B65H2404/14—Roller pairs
Definitions
- the present invention relates to an automatic document feeder with an anti-skew function and, more particularly, to an automatic document feeder for automatically feeding a plurality of documents to an image scanning device one by one.
- an automatic document feeder is used to feed a plurality of documents to an image scanning device (e.g., CCD module) mounted in the device one by one.
- the automatic document feeder is mounted in an image scanning device, which may be one of a scanner, a facsimile, a duplicator or a multifunctional device.
- an image scanning device which may be one of a scanner, a facsimile, a duplicator or a multifunctional device.
- a charge coupled device (CCD) module 102 for digitally imaging light reflected from an illuminated surface of the document.
- the CCD module 102 is provided with a transparent window 104 at its upper portion to transmit the light to the CCD module 102 .
- the automatic document feeder 110 is mounted on the main body 100 .
- the automatic document feeder 110 is provided with a tray 112 formed at a top surface of the automatic document feeder 110 for loading a plurality of documents P, which are to be inserted.
- a pick up roller 120 for inserting the documents one by one is installed at a position adjacent to the tray 112 .
- the pick up roller 120 is moved downward to the document by driving means (not shown) depending upon a signal from a controller (not shown) to transfer the document into the device by friction force.
- the transferred document is prevented from double feeding by an ADF roller 122 .
- a friction rubber 124 biased by a resilient spring 126 is located under the ADF roller 122 to come in contact with the ADF roller 122 to thereby supply only an uppermost document due to a difference of friction forces when the documents are double fed.
- the document P which has passed through the ADF roller 122 , is transferred to a REGI roller 128 .
- the REGI roller 128 is rotated or stopped depending upon a signal from a controller to prevent the document from being double fed toward a feed roller 130 by transferring or temporarily stopping the document.
- the document transferred by the REGI roller 128 is moved to an upper portion of the CCD module 102 by the feed roller 130 to be scanned.
- the feed roller 130 should have the strongest driving force of the aforementioned rollers to prevent the document from slipping in order to obtain a stable image, since the slip of the document may remarkably affect image quality.
- the document is discharged to a discharge tray 114 by a discharge roller 132
- the REGI roller 128 is set to have the same document feed speed on its surface as the feed roller 130 . That is, the document feed speed of the REGI roller 128 and the document feed speed of the feed roller 130 are set to have the same value. In reality, however, both of these feed speed values become different due to manufacturing and assembling tolerance.
- the maximum and minimum velocities within the tolerance have a difference of about 0.7 mm/sec.
- the REGI roller has an outer diameter at the maximum tolerance and the feed roller has an outer diameter at the minimum tolerance, it does not matter.
- the REGI roller has an outer diameter at the minimum tolerance and the feed roller has an outer diameter at the maximum tolerance, difficulties are presented since the feed roller has a velocity faster than that of the REGI roller.
- FIG. 2 schematically illustrates when the feed roller is rotated faster than the REGI roller. Both rollers are illustrated in parallel with each other for illustrative purposes to facilitate a better understanding, but are actually positioned as illustrated in FIG. 1 .
- the feed roller 130 when the feed roller 130 is faster, tensile strength is generated in a lateral direction of the document, and the feed roller 130 has larger document feeding pressure, thereby generating a slip of about 0.7 mm/sec on the REGI roller as the result calculated above. Therefore, the roller is subjected to load during the document feeding to generate skew, and driving means such as a motor is also subjected to load due to an increase of the document feeding pressure, as a result. Thereby, the motor may be stepped out.
- an object of the present invention is to provide an automatic document feeder capable of stably feeding documents by adjusting an RPM of a feed roller and an RPM of a roller disposed before the feed roller to prevent slip and skew from occuring.
- an automatic document feeder includes: a pick up roller for feeding documents loaded on a tray; a feed roller for transferring the fed documents toward document scanning means; and an intermediate roller disposed just before the feed roller to transfer the documents toward the pick up roller, wherein the intermediate roller has a document feed speed on a surface thereof faster than that of the feed roller.
- the present invention intentionally makes the document feed speed on a surface of the feed roller slower than the document feed speed on a surface of the intermediate roller located just before the feed roller to prevent tensile strength from being transmitted to the document.
- the intermediate roller may be a REGI roller for aligning the fed documents, which may be varied depending upon a type of the automatic document feeder.
- the intermediate roller may be more rapidly rotated while outer diameters of the intermediate roller and the feed roller are remained as they were, the intermediate roller may have an outer diameter lager than the maximum tolerance of the feed roller to allow both rollers to be rotated at the same angular velocity, or both methods may be employed at the same time.
- the intermediate roller has a document feed speed on a surface thereof faster than that of the feed roller by about 1 ⁇ 2%.
- the document may be sagging or rolled to cause jamming, and when the speed difference becomes excessively small, anti-slip and anti-skew effects become insignificant.
- an automatic document feeder includes: a first pick up roller for feeding documents loaded on a tray; a feed roller transferring the fed documents toward document scanning means; a first intermediate roller disposed just before the feed roller to transfer the documents toward the pick up roller, a second pick up roller for refeeding the document that one surface was completely scanned, and a second intermediate roller for refeeding the document refed by the second pick up roller toward the feed roller, wherein the first and second intermediate rollers have a document feed speed on surfaces thereof faster than that of the feed roller.
- the present invention may be applied to the automatic document feeder for dual scanning, in this case, since the first and second intermediate rollers transfer the documents to the feed roller, the intermediate rollers have a document feed speed on the surfaces thereof faster than that of the feed roller.
- the first and second intermediate rollers have a document feed speed on the surfaces thereof faster than that of the feed roller by about 1 ⁇ 2%.
- FIG. 1 is a schematic side view illustrating a conventional automatic document feeder
- FIG. 2 is a perspective view illustrating a document fed in a poor manner due to a speed difference between a REGI roller and a feed roller in the automatic document feeder shown in FIG. 1 ;
- FIG. 3 is a perspective view illustrating improved operation of the automatic document feeder shown in FIG. 1 in accordance with an embodiment of the present invention.
- FIG. 4 is a side view illustrating an automatic document feeder in accordance with another embodiment of the present invention.
- FIG. 1 An automatic document feeder in accordance with an embodiment of the present invention will be described with reference to FIG. 1 .
- the automatic document feeder of the present invention can comprise similar parts, however, it can be controlled differently.
- a basic structure of the embodiment may employ the structure of FIG. 1 .
- the feed roller 130 has an outer diameter of 22 mm
- the REGI roller 128 has an outer diameter of 22.2 mm.
- tolerance is 0.05 mm and the conditions in FIG.
- the document feed speed of the REGI roller is faster than the linear velocity of the feed roller when the document is placed between the REGI roller and the feed roller, power of resistance is not generated by the REGI roller. Since the document is transferred by only the linear velocity and the feeding force of the feed roller, skew by the resisting force of the REGI roller is suppressed and a driving system has no load, thereby preventing a lifetime of the feeder from being shortened and improving document feeding performance.
- FIG. 3 schematically illustrates the above-mentioned state.
- the REGI roller 128 and the feed roller 130 are disposed in parallel with each other for illustrative purposes. That is, since the REGI roller 128 has a linear velocity faster than that of the feed roller 130 , as shown, the document is fed loosely to prevent the slip or the skew from occurring.
- the released state of the document shown in FIG. 3 is exaggerated for illustrative purposes and, in reality, the document is not so much separated from a predetermined feeding path.
- the automatic document feeder adjusts the linear velocity by increasing the outer diameter of the REGI roller, it may be desirable to adjust a reduction ratio of a gear train and maintain the outer diameter equally. In addition, it may be also desirable to adjust both the outer diameter and the reduction ratio of the gear train.
- FIG. 4 another embodiment of an automatic document feeder in accordance with the present invention is illustrated.
- Like numbers as the embodiment in FIG. 1 refer to like elements in the following description, so their descriptions will be omitted.
- the embodiment in FIG. 4 relates to an automatic document feeder for dual scanning, the document P′ primarily discharged to a discharge tray 114 by a discharge roller 132 is retransferred into the feeder by a second pick up roller 140 , and then the transferred document P′ is transferred toward the feed roller 130 by an intermediate roller 142 to be scanned. Therefore, the dual scanning of a single document may be performed.
- the REGI roller 128 awaits in the state that the document P is stopped while the scanning for the document is performed, and the REGI roller 128 initiates to transfer the document when the scanning for the document is completed, thereby preventing the document from overlapping on the feed roller.
- the intermediate roller 142 is also disposed just before the feed roller to have a linear velocity faster than that of the feed roller.
- the intermediate roller 142 may have an outer diameter larger than that of the feed roller 130 , similarly to the REGI roller 128 .
- the present invention is capable of improving a document feed performance by preventing the skew from generating between the REGI roller or the intermediate roller and the feed roller by only adjusting the linear velocity of the REGI roller or the intermediate roller, and extending the lifetime of a device such as a motor since a driving system has no additional load.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Delivering By Means Of Belts And Rollers (AREA)
- Registering Or Overturning Sheets (AREA)
- Facsimiles In General (AREA)
- Sheets, Magazines, And Separation Thereof (AREA)
Abstract
An automatic document feeder with an anti-skew function is disclosed. The automatic document feeder comprises a pick up roller for feeding documents loaded on a tray, a feed roller for transferring the fed documents toward document scanning means; and an intermediate roller disposed just before the feed roller to transfer the documents toward the feed roller. The Intermediate roller has a document feed speed on a surface thereof faster than that of the feed roller. It is possible to prevent skew from occurring between the REGI roller or the intermediate roller and the feed roller by merely adjusting a linear velocity of the REGI roller or the intermediate roller, thereby improving document feeding performance and extending a lifetime of the device such as a motor since a driving system has no additional load.
Description
- This application claims the benefit of Korean Patent Application No. 2004-54941, filed on Jul. 14, 2004, the disclosure of which is hereby incorporated herein by reference in its entirety.
- 1. Field of the Invention
- The present invention relates to an automatic document feeder with an anti-skew function and, more particularly, to an automatic document feeder for automatically feeding a plurality of documents to an image scanning device one by one.
- 2. Description of the Related Art
- In a device for scanning and imaging, transmitting or duplicating contents of documents, such as a duplicator, a scanner, a facsimile or a multifunctional device having all functions of the aforementioned devices, an automatic document feeder (ADF) is used to feed a plurality of documents to an image scanning device (e.g., CCD module) mounted in the device one by one.
- Referring to
FIG. 1 , an example of a typical automatic document feeder is illustrated. In this figure, the automatic document feeder is mounted in an image scanning device, which may be one of a scanner, a facsimile, a duplicator or a multifunctional device. Mounted in amain body 100 of an image scanning device is a charge coupled device (CCD)module 102 for digitally imaging light reflected from an illuminated surface of the document. TheCCD module 102 is provided with atransparent window 104 at its upper portion to transmit the light to theCCD module 102. - The
automatic document feeder 110 is mounted on themain body 100. Theautomatic document feeder 110 is provided with atray 112 formed at a top surface of theautomatic document feeder 110 for loading a plurality of documents P, which are to be inserted. A pick uproller 120 for inserting the documents one by one is installed at a position adjacent to thetray 112. The pick uproller 120 is moved downward to the document by driving means (not shown) depending upon a signal from a controller (not shown) to transfer the document into the device by friction force. The transferred document is prevented from double feeding by anADF roller 122. - That is, a
friction rubber 124 biased by aresilient spring 126 is located under theADF roller 122 to come in contact with theADF roller 122 to thereby supply only an uppermost document due to a difference of friction forces when the documents are double fed. The document P, which has passed through theADF roller 122, is transferred to aREGI roller 128. TheREGI roller 128 is rotated or stopped depending upon a signal from a controller to prevent the document from being double fed toward afeed roller 130 by transferring or temporarily stopping the document. - The document transferred by the
REGI roller 128 is moved to an upper portion of theCCD module 102 by thefeed roller 130 to be scanned. Thefeed roller 130 should have the strongest driving force of the aforementioned rollers to prevent the document from slipping in order to obtain a stable image, since the slip of the document may remarkably affect image quality. After scanning, the document is discharged to adischarge tray 114 by adischarge roller 132 - In the case of the conventional automatic document feeder, the
REGI roller 128 is set to have the same document feed speed on its surface as thefeed roller 130. That is, the document feed speed of theREGI roller 128 and the document feed speed of thefeed roller 130 are set to have the same value. In reality, however, both of these feed speed values become different due to manufacturing and assembling tolerance. - For example, when the roller has an outer diameter of 22 mm, a gear train for driving the roller has a reduction ratio of 0.31, the number of rotations of the motor is 421.5 rpm, and the outer diameter of the roller has maximum and minimum tolerance of 0.05 mm, a linear velocity is calculated as follows:
Vmax=π×Dmax(roller)×N(rpm)/60×l(reduction ratio)=22.05×421.5/60×0.31=150.78/sec
Vmin=π×Dmax(roller)×N(rpm)/60×l(reduction ratio)=21.95×421.5/60×0.31=150.09/sec - Finally, the maximum and minimum velocities within the tolerance have a difference of about 0.7 mm/sec. When the REGI roller has an outer diameter at the maximum tolerance and the feed roller has an outer diameter at the minimum tolerance, it does not matter. By contrast, when the REGI roller has an outer diameter at the minimum tolerance and the feed roller has an outer diameter at the maximum tolerance, difficulties are presented since the feed roller has a velocity faster than that of the REGI roller.
-
FIG. 2 schematically illustrates when the feed roller is rotated faster than the REGI roller. Both rollers are illustrated in parallel with each other for illustrative purposes to facilitate a better understanding, but are actually positioned as illustrated inFIG. 1 . As shown, when thefeed roller 130 is faster, tensile strength is generated in a lateral direction of the document, and thefeed roller 130 has larger document feeding pressure, thereby generating a slip of about 0.7 mm/sec on the REGI roller as the result calculated above. Therefore, the roller is subjected to load during the document feeding to generate skew, and driving means such as a motor is also subjected to load due to an increase of the document feeding pressure, as a result. Thereby, the motor may be stepped out. - Therefore, an object of the present invention is to provide an automatic document feeder capable of stably feeding documents by adjusting an RPM of a feed roller and an RPM of a roller disposed before the feed roller to prevent slip and skew from occuring.
- According to an aspect of the present invention, an automatic document feeder includes: a pick up roller for feeding documents loaded on a tray; a feed roller for transferring the fed documents toward document scanning means; and an intermediate roller disposed just before the feed roller to transfer the documents toward the pick up roller, wherein the intermediate roller has a document feed speed on a surface thereof faster than that of the feed roller.
- That is, the present invention intentionally makes the document feed speed on a surface of the feed roller slower than the document feed speed on a surface of the intermediate roller located just before the feed roller to prevent tensile strength from being transmitted to the document. In this connection, the intermediate roller may be a REGI roller for aligning the fed documents, which may be varied depending upon a type of the automatic document feeder.
- At this time, the intermediate roller may be more rapidly rotated while outer diameters of the intermediate roller and the feed roller are remained as they were, the intermediate roller may have an outer diameter lager than the maximum tolerance of the feed roller to allow both rollers to be rotated at the same angular velocity, or both methods may be employed at the same time.
- Meanwhile, preferably, the intermediate roller has a document feed speed on a surface thereof faster than that of the feed roller by about 1˜2%. When a speed difference becomes excessively large, the document may be sagging or rolled to cause jamming, and when the speed difference becomes excessively small, anti-slip and anti-skew effects become insignificant.
- According to another aspect of the present invention, an automatic document feeder includes: a first pick up roller for feeding documents loaded on a tray; a feed roller transferring the fed documents toward document scanning means; a first intermediate roller disposed just before the feed roller to transfer the documents toward the pick up roller, a second pick up roller for refeeding the document that one surface was completely scanned, and a second intermediate roller for refeeding the document refed by the second pick up roller toward the feed roller, wherein the first and second intermediate rollers have a document feed speed on surfaces thereof faster than that of the feed roller.
- That is, the present invention may be applied to the automatic document feeder for dual scanning, in this case, since the first and second intermediate rollers transfer the documents to the feed roller, the intermediate rollers have a document feed speed on the surfaces thereof faster than that of the feed roller.
- In this connection, the first and second intermediate rollers have a document feed speed on the surfaces thereof faster than that of the feed roller by about 1˜2%.
- The above and other features and advantages of the present invention will become more apparent to those of ordinary skill in the art by describing in detail preferred embodiments thereof with reference to the attached drawings in which:
-
FIG. 1 is a schematic side view illustrating a conventional automatic document feeder; -
FIG. 2 is a perspective view illustrating a document fed in a poor manner due to a speed difference between a REGI roller and a feed roller in the automatic document feeder shown inFIG. 1 ; -
FIG. 3 is a perspective view illustrating improved operation of the automatic document feeder shown inFIG. 1 in accordance with an embodiment of the present invention; and -
FIG. 4 is a side view illustrating an automatic document feeder in accordance with another embodiment of the present invention. - The present invention will now be described more fully hereinafter with reference to the accompanying drawings, in which preferred embodiments of the invention are shown. This invention may, however, be embodied in different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. In the drawings, the thickness of layers and regions are exaggerated for clarity. Like numbers refer to like elements throughout the specification.
- Hereinafter, an embodiment of an automatic document feeder in accordance with the present invention will be described with reference to the accompanying drawings.
- An automatic document feeder in accordance with an embodiment of the present invention will be described with reference to
FIG. 1 . The automatic document feeder of the present invention can comprise similar parts, however, it can be controlled differently. Thus, a basic structure of the embodiment may employ the structure ofFIG. 1 . However, in order to make a document feed speed on a REGI roller 128 (i.e., a linear velocity of the REGI roller 128) faster than that of afeed roller 130 by about 1%, thefeed roller 130 has an outer diameter of 22 mm, and theREGI roller 128 has an outer diameter of 22.2 mm. When tolerance is 0.05 mm and the conditions inFIG. 1 are applied, the maximum and minimum linear velocities of theREGI roller 128 and thefeed roller 130 are calculated as follows:
Vfeed-max=π×Dmax(roller)×N(rpm)/60×I(reduction ratio)=22.05×421.5/60×0.31=150.78/sec
Vfeed-min=π×Dmax(roller)×N(rpm)/60×I(reduction ratio)=21.95×421.5/60×0.31=150.09/sec
Vregi-max=π×Dmax(roller)×N(rpm)/60×I(reduction ratio)=22.25×421.5/60×0.31=152.14/sec
Vregi-min=π×Dmax(roller)×N(rpm)/60×I(reduction ratio)=22.15×421.5/60×0.31=151.46/sec - Viewing the calculated results, since the minimum velocity of the
REGI roller 128 is faster than the maximum velocity of thefeed roller 130 by about 0.7 mm/sec, i.e., the speed of document transferred toward thefeed roller 130 by theREGI roller 128 is faster than the speed of document transferred toward aCCD module 102 by thefeed roller 130, tensile stress is not generated on the document. - That is, since the document feed speed of the REGI roller is faster than the linear velocity of the feed roller when the document is placed between the REGI roller and the feed roller, power of resistance is not generated by the REGI roller. Since the document is transferred by only the linear velocity and the feeding force of the feed roller, skew by the resisting force of the REGI roller is suppressed and a driving system has no load, thereby preventing a lifetime of the feeder from being shortened and improving document feeding performance.
-
FIG. 3 schematically illustrates the above-mentioned state. TheREGI roller 128 and thefeed roller 130 are disposed in parallel with each other for illustrative purposes. That is, since theREGI roller 128 has a linear velocity faster than that of thefeed roller 130, as shown, the document is fed loosely to prevent the slip or the skew from occurring. Of course, the released state of the document shown inFIG. 3 is exaggerated for illustrative purposes and, in reality, the document is not so much separated from a predetermined feeding path. - While the automatic document feeder adjusts the linear velocity by increasing the outer diameter of the REGI roller, it may be desirable to adjust a reduction ratio of a gear train and maintain the outer diameter equally. In addition, it may be also desirable to adjust both the outer diameter and the reduction ratio of the gear train.
- Referring to
FIG. 4 , another embodiment of an automatic document feeder in accordance with the present invention is illustrated. Like numbers as the embodiment inFIG. 1 refer to like elements in the following description, so their descriptions will be omitted. - The embodiment in
FIG. 4 relates to an automatic document feeder for dual scanning, the document P′ primarily discharged to adischarge tray 114 by adischarge roller 132 is retransferred into the feeder by a second pick uproller 140, and then the transferred document P′ is transferred toward thefeed roller 130 by anintermediate roller 142 to be scanned. Therefore, the dual scanning of a single document may be performed. At this time, theREGI roller 128 awaits in the state that the document P is stopped while the scanning for the document is performed, and theREGI roller 128 initiates to transfer the document when the scanning for the document is completed, thereby preventing the document from overlapping on the feed roller. - Meanwhile, the
intermediate roller 142 is also disposed just before the feed roller to have a linear velocity faster than that of the feed roller. In order to make the linear velocity of theintermediate roller 142 faster, theintermediate roller 142 may have an outer diameter larger than that of thefeed roller 130, similarly to theREGI roller 128. In addition, it may be possible to adjust the reduction ratio, or adjust the reduction ratio and the outer diameter at the same time. - As can be seen from the foregoing, the present invention is capable of improving a document feed performance by preventing the skew from generating between the REGI roller or the intermediate roller and the feed roller by only adjusting the linear velocity of the REGI roller or the intermediate roller, and extending the lifetime of a device such as a motor since a driving system has no additional load.
Claims (9)
1. An automatic document feeder comprising:
a pick up roller for feeding documents loaded on a tray;
a feed roller transferring the fed documents toward document scanning means; and
an intermediate roller disposed just before the feed roller to transfer the documents toward the feed roller,
wherein the intermediate roller has a document feed speed on a surface thereof faster than that of the feed roller.
2. The automatic document feeder according to claim 1 , wherein the intermediate roller is a REGI roller for aligning the fed documents.
3. The automatic document feeder according to claim 1 , wherein the intermediate roller has a document feed speed on a surface thereof faster than that of the feed roller by about 1˜2%.
4. An automatic document feeder comprising:
a first pick up roller for feeding documents loaded on a tray;
a feed roller transferring the fed documents toward document scanning means;
a first intermediate roller disposed just before the feed roller to transfer the documents toward the feed roller;
a second pick up roller for refeeding the document that having one surface already scanned; and
a second intermediate roller for refeeding the document refed by the second pick up roller toward the feed roller,
wherein the first and second intermediate rollers have a document feed speed on surfaces thereof faster than that of the feed roller.
5. The automatic document feeder according to claim 4 , wherein the first intermediate roller is a REGI roller for aligning the fed documents.
6. The automatic document feeder according to claim 4 , wherein the first and second intermediate rollers have a document feed speed on the surfaces thereof faster than that of the feed roller by about 1˜2%.
7. A method of operating an automatic document feeder comprising:
picking up documents for feeding documents loaded on a tray;
transferring the documents toward document scanning means via a feed roller; and
transferring the documents toward the feed roller via an intermediate roller disposed just before the feed roller,
wherein the intermediate roller has a document feed speed on a surface thereof faster than that of the feed roller.
8. The method according to claim 7 , wherein the intermediate roller is a REGI roller for aligning the fed documents.
9. The method according to claim 7 , wherein the intermediate roller has a document feed speed on a surface thereof faster than that of the feed roller by about 1˜2%.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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KR2004-54941 | 2004-07-14 | ||
KR1020040054941A KR100560719B1 (en) | 2004-07-14 | 2004-07-14 | Automatic document feeder with anti-skew function |
Publications (1)
Publication Number | Publication Date |
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US20060012104A1 true US20060012104A1 (en) | 2006-01-19 |
Family
ID=35598645
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US11/109,655 Abandoned US20060012104A1 (en) | 2004-07-14 | 2005-04-20 | Automatic document feeder with anti-skew function |
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US (1) | US20060012104A1 (en) |
KR (1) | KR100560719B1 (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20070235921A1 (en) * | 2006-03-28 | 2007-10-11 | Schalk Wesley R | Advancing a media sheet along a media path |
US20080197559A1 (en) * | 2007-02-19 | 2008-08-21 | Seiko Epson Corporation | Media processing device |
US20090219371A1 (en) * | 2008-02-29 | 2009-09-03 | Brother Kogyo Kabushiki Kaisha | Sheet feeding device, image recording apparatus and sheet feeding amount compensating method |
US20090250868A1 (en) * | 2008-04-04 | 2009-10-08 | Chen-Tsai Tsai | Roller module for an automatic document feeder |
US20090295062A1 (en) * | 2008-05-27 | 2009-12-03 | Thomas Sheng | Automatic sheet feeder and scan apparatus with assemblies for transporting sheet at different speeds |
US9511972B1 (en) * | 2015-09-28 | 2016-12-06 | Kabushiki Kaisha Toshiba | Paper conveyance apparatus and image forming apparatus |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6005687A (en) * | 1996-04-12 | 1999-12-21 | Ricoh Company, Ltd. | Imaging apparatus having different motors for separating and reading documents |
US6128107A (en) * | 1996-04-12 | 2000-10-03 | Ricoh Company, Ltd. | Image apparatus having different motors for separating and reading documents |
US6397035B2 (en) * | 1998-10-16 | 2002-05-28 | Canon Kabushiki Kaisha | Image forming apparatus with control of conveying speeds |
US20020063384A1 (en) * | 2000-11-29 | 2002-05-30 | Quesnel Lisbeth S. | Varying velocity sheet handler |
US20030214096A1 (en) * | 2002-05-14 | 2003-11-20 | Canon Finetech Inc. | Document feeder and image forming apparatus |
US6674979B2 (en) * | 2001-03-28 | 2004-01-06 | Canon Kabushiki Kaisha | Image forming apparatus enabled to optimize transfer medium slack between transferring and fixing portions |
-
2004
- 2004-07-14 KR KR1020040054941A patent/KR100560719B1/en not_active IP Right Cessation
-
2005
- 2005-04-20 US US11/109,655 patent/US20060012104A1/en not_active Abandoned
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6005687A (en) * | 1996-04-12 | 1999-12-21 | Ricoh Company, Ltd. | Imaging apparatus having different motors for separating and reading documents |
US6128107A (en) * | 1996-04-12 | 2000-10-03 | Ricoh Company, Ltd. | Image apparatus having different motors for separating and reading documents |
US6397035B2 (en) * | 1998-10-16 | 2002-05-28 | Canon Kabushiki Kaisha | Image forming apparatus with control of conveying speeds |
US20020063384A1 (en) * | 2000-11-29 | 2002-05-30 | Quesnel Lisbeth S. | Varying velocity sheet handler |
US6674979B2 (en) * | 2001-03-28 | 2004-01-06 | Canon Kabushiki Kaisha | Image forming apparatus enabled to optimize transfer medium slack between transferring and fixing portions |
US20030214096A1 (en) * | 2002-05-14 | 2003-11-20 | Canon Finetech Inc. | Document feeder and image forming apparatus |
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20070235921A1 (en) * | 2006-03-28 | 2007-10-11 | Schalk Wesley R | Advancing a media sheet along a media path |
US7637500B2 (en) | 2006-03-28 | 2009-12-29 | Hewlett-Packard Development Company, L.P. | Advancing a media sheet along a media path |
US20080197559A1 (en) * | 2007-02-19 | 2008-08-21 | Seiko Epson Corporation | Media processing device |
US7900907B2 (en) * | 2007-02-19 | 2011-03-08 | Seiko Epson Corporation | Media processing device |
US20090219371A1 (en) * | 2008-02-29 | 2009-09-03 | Brother Kogyo Kabushiki Kaisha | Sheet feeding device, image recording apparatus and sheet feeding amount compensating method |
US8205881B2 (en) * | 2008-02-29 | 2012-06-26 | Brother Kogyo Kabushiki Kaisha | Sheet feeding device, image recording apparatus and sheet feeding amount compensating method |
US20090250868A1 (en) * | 2008-04-04 | 2009-10-08 | Chen-Tsai Tsai | Roller module for an automatic document feeder |
US8157260B2 (en) | 2008-04-04 | 2012-04-17 | Silitek Electronic (Guangzhou) Co., Ltd. | Roller module for an automatic document feeder |
CN101549798B (en) * | 2008-04-04 | 2012-05-30 | 旭丽电子(广州)有限公司 | Medium deflexion correction mechanism |
US20090295062A1 (en) * | 2008-05-27 | 2009-12-03 | Thomas Sheng | Automatic sheet feeder and scan apparatus with assemblies for transporting sheet at different speeds |
US9511972B1 (en) * | 2015-09-28 | 2016-12-06 | Kabushiki Kaisha Toshiba | Paper conveyance apparatus and image forming apparatus |
US9864316B2 (en) | 2015-09-28 | 2018-01-09 | Kabushiki Kaisha Toshiba | Paper conveyance apparatus and image forming apparatus |
Also Published As
Publication number | Publication date |
---|---|
KR20060005937A (en) | 2006-01-18 |
KR100560719B1 (en) | 2006-03-13 |
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