US20110084443A1 - Sheet conveying device, image forming apparatus, and method of detecting double-feed of sheet - Google Patents
Sheet conveying device, image forming apparatus, and method of detecting double-feed of sheet Download PDFInfo
- Publication number
- US20110084443A1 US20110084443A1 US12/897,761 US89776110A US2011084443A1 US 20110084443 A1 US20110084443 A1 US 20110084443A1 US 89776110 A US89776110 A US 89776110A US 2011084443 A1 US2011084443 A1 US 2011084443A1
- Authority
- US
- United States
- Prior art keywords
- roller
- sheet
- unit
- original document
- detecting unit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H9/00—Registering, e.g. orientating, articles; Devices therefor
- B65H9/004—Deskewing sheet by abutting against a stop, i.e. producing a buckling of the sheet
- B65H9/006—Deskewing sheet by abutting against a stop, i.e. producing a buckling of the sheet the stop being formed by forwarding means in stand-by
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H7/00—Controlling article feeding, separating, pile-advancing, or associated apparatus, to take account of incorrect feeding, absence of articles, or presence of faulty articles
- B65H7/02—Controlling article feeding, separating, pile-advancing, or associated apparatus, to take account of incorrect feeding, absence of articles, or presence of faulty articles by feelers or detectors
- B65H7/06—Controlling article feeding, separating, pile-advancing, or associated apparatus, to take account of incorrect feeding, absence of articles, or presence of faulty articles by feelers or detectors responsive to presence of faulty articles or incorrect separation or feed
- B65H7/12—Controlling article feeding, separating, pile-advancing, or associated apparatus, to take account of incorrect feeding, absence of articles, or presence of faulty articles by feelers or detectors responsive to presence of faulty articles or incorrect separation or feed responsive to double feed or separation
-
- 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
- H04N1/00567—Handling of original or reproduction media, e.g. cutting, separating, stacking
- H04N1/0057—Conveying sheets before or after scanning
-
- 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
- H04N1/00567—Handling of original or reproduction media, e.g. cutting, separating, stacking
- H04N1/0057—Conveying sheets before or after scanning
- H04N1/00588—Conveying sheets before or after scanning to the scanning position
-
- 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
- H04N1/00567—Handling of original or reproduction media, e.g. cutting, separating, stacking
- H04N1/0057—Conveying sheets before or after scanning
- H04N1/00599—Using specific components
- H04N1/00602—Feed rollers
-
- 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
- H04N1/00567—Handling of original or reproduction media, e.g. cutting, separating, stacking
- H04N1/00628—Separating, e.g. preventing feeding of two sheets at a time
-
- 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
- H04N1/32—Circuits or arrangements for control or supervision between transmitter and receiver or between image input and image output device, e.g. between a still-image camera and its memory or between a still-image camera and a printer device
- H04N1/32609—Fault detection or counter-measures, e.g. original mis-positioned, shortage of paper
- H04N1/32625—Fault detection
- H04N1/3263—Fault detection of reading apparatus or transmitter, e.g. original jam
-
- 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
- H04N1/32—Circuits or arrangements for control or supervision between transmitter and receiver or between image input and image output device, e.g. between a still-image camera and its memory or between a still-image camera and a printer device
- H04N1/32609—Fault detection or counter-measures, e.g. original mis-positioned, shortage of paper
- H04N1/32646—Counter-measures
- H04N1/32651—Indicating or reporting
- H04N1/32657—Indicating or reporting locally
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2511/00—Dimensions; Position; Numbers; Identification; Occurrences
- B65H2511/30—Numbers, e.g. of windings or rotations
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2511/00—Dimensions; Position; Numbers; Identification; Occurrences
- B65H2511/50—Occurence
- B65H2511/51—Presence
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2511/00—Dimensions; Position; Numbers; Identification; Occurrences
- B65H2511/50—Occurence
- B65H2511/52—Defective operating conditions
- B65H2511/524—Multiple articles, e.g. double feed
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2513/00—Dynamic entities; Timing aspects
- B65H2513/50—Timing
- B65H2513/51—Sequence of process
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2513/00—Dynamic entities; Timing aspects
- B65H2513/50—Timing
- B65H2513/512—Starting; Stopping
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2553/00—Sensing or detecting means
- B65H2553/30—Sensing or detecting means using acoustic or ultrasonic elements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2801/00—Application field
- B65H2801/03—Image reproduction devices
- B65H2801/06—Office-type machines, e.g. photocopiers
-
- 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
- H04N1/04—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa
- H04N1/12—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using the sheet-feed movement or the medium-advance or the drum-rotation movement as the slow scanning component, e.g. arrangements for the main-scanning
-
- 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
- H04N1/04—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa
- H04N1/19—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using multi-element arrays
- H04N1/191—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using multi-element arrays the array comprising a one-dimensional array, or a combination of one-dimensional arrays, or a substantially one-dimensional array, e.g. an array of staggered elements
- H04N1/192—Simultaneously or substantially simultaneously scanning picture elements on one main scanning line
- H04N1/193—Simultaneously or substantially simultaneously scanning picture elements on one main scanning line using electrically scanned linear arrays, e.g. linear CCD arrays
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N2201/00—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof
- H04N2201/0077—Types of the still picture apparatus
- H04N2201/0081—Image reader
Definitions
- Embodiments described herein relate generally to a technique for performing double-feed detection for a sheet.
- double-feed detection for an original document conveyed in an auto document feeder is performed in a state in which the original document is bent by bringing the original document into contact with an aligning roller that corrects a tilt of the original document.
- FIG. 1 is a sectional view of an image forming apparatus
- FIG. 2 is a sectional view of an auto document feeder
- FIG. 3 is a block diagram of components related to document conveyance by the auto document feeder
- FIG. 4 is a flowchart for explaining the operation of the auto document feeder
- FIG. 5 is a sectional view of the auto document feeder, wherein an original document located in a double-feed detection position is schematically shown;
- FIG. 6 is a sectional view of the auto document feeder, wherein a position of the original document at the time when a motor driving unit stops is schematically shown.
- a sheet conveying device includes: a first roller configured to correct a tilt of a sheet to be conveyed; a first detecting unit located further on an upstream side in a conveying direction of the sheet than the first roller and configured to detect information concerning double-feed of the sheet; a second roller configured to convey the sheet to the first roller; a driving unit configured to drive the second roller; and a controller configured to control the driving unit to thereby temporarily stop the conveyance of the sheet in order to perform the detection by the first detecting unit in a state in which an end of the sheet on a downstream side in the conveying direction of the sheet is located further on the upstream side in the conveying direction of the sheet than a nip position of the first roller.
- FIG. 1 is a sectional view of an image forming apparatus.
- An image forming apparatus 1 may be a MFP (Multi Function Printer).
- the image forming apparatus 1 includes an image reading unit R and an image forming unit P.
- the image reading unit R scans and reads images of a sheet document and a book document.
- the image forming unit P forms a developer image on a sheet on the basis of an image read from an original document by the image reading unit R or print data transmitted to the image forming apparatus 1 by an external apparatus.
- the image reading unit R includes an auto document feeder (ADF) 9 configured to automatically convey an original document to a predetermined image reading position.
- the image reading unit R reads, with a scanning optical system 10 , an image of an original document automatically conveyed by the auto document feeder 9 and placed on a document tray (a predetermined document placing table) Rt or an original document placed on a not-shown document table.
- ADF auto document feeder
- the image forming unit P includes toner cartridges 1 Y to 1 K, photoconductive members 2 Y to 2 K, developing rollers 3 Y to 3 K, mixers 4 Y to 4 K, an intermediate transfer belt 6 , a fixing device 7 , and a discharge tray 8 .
- the image forming apparatus 1 includes a controller 801 , a memory 803 , an operation display unit 805 , and a communication unit 807 .
- the controller 801 has a role of performing various kinds of processing in the image forming apparatus 1 and also has a role of realizing various functions by executing computer programs stored in the memory 803 .
- the memory 803 may be, for example, a RAM (Random Access Memory), a ROM (Read Only Memory), a DRAM (Dynamic Random Access Memory), an SRAM (Static Random Access Memory), or a VRAM (Video RAM).
- the memory 803 has a role of storing various kinds of information and computer programs used in the image forming apparatus 1 .
- the operation display unit 805 may be an LCD (Liquid Crystal Display), an EL (Electronic Luminescence), a PDP (Plasma Display Panel), or a CRT (Cathode Ray Tube).
- LCD Liquid Crystal Display
- EL Electro Luminescence
- PDP Plasma Display Panel
- CRT Cathode Ray Tube
- the various kinds of setting are changed by operating the operation display unit 805 .
- the operation display unit 805 may be a touch panel type.
- sheets picked up from cassettes enter a sheet conveying path.
- the sheets entered the sheet conveying path are moved in a predetermined conveying direction by plural roller pairs.
- Images of plural sheet documents continuously automatically conveyed by the auto document feeder 9 are read by the scanning optical system 10 in the predetermined image reading position.
- electrostatic latent images are formed on photoconductive surfaces of the photoconductive members 2 Y, 2 M, 2 C, and 2 K for transferring developer images of yellow (Y), magenta (M), cyan(C), and black (K) onto the sheets.
- developers agitated by the mixers 4 Y to 4 K in a developing device are deposited by the developing rollers 3 Y to 3 K on the photoconductive members 2 Y to 2 K on which the electrostatic latent images are formed as explained above. Consequently, the electrostatic latent images formed on the photoconductive surfaces of the photoconductive members are visualized.
- Developer images formed on the photoconductive members in this way are transferred onto a belt surface of the intermediate transfer belt 6 (so-called primary transfer).
- the developer images conveyed by the rotation of the intermediate transfer belt 6 are transferred onto the conveyed sheets in a predetermined secondary transfer position T.
- the developer images transferred onto the sheets are heated and fixed on the sheets by the fixing device 7 .
- the sheets having the developer images heated and fixed thereon are conveyed in the conveying path by plural conveying roller pairs and sequentially discharged onto the discharge tray 8 .
- FIG. 2 is an enlarged sectional view of the auto document feeder.
- An original document is set on a document tray 11 .
- the document may be plural documents or one document.
- a pickup roller 12 as a third roller picks up the original document located on the document tray 11 and conveys the original document to a paper feeding roller 13 as a second roller.
- the paper feeding roller 13 conveys the original document picked up by the pickup roller 12 to downstream in the conveying direction.
- Rotating shaft sections of the pickup roller 12 and the paper feeding roller 13 are connected to each other via a transmission mechanism 18 .
- the transmission mechanism 18 may be a belt or a pulley.
- FIG. 3 is a block diagram of components related to document conveyance by the auto document feeder 9 .
- the pickup roller 12 moves up and down according to the operation of a solenoid driving unit 40 .
- the solenoid driving unit 40 includes a solenoid driver 41 and a pickup solenoid 42 .
- a separation roller 14 as a fourth roller is located to be opposed to the paper feeding roller 13 .
- a load of a torque limiter of the separation roller 14 is increased by frictional force of the original documents and the separation roller 14 stops.
- the stopped separation roller 14 comes into contact with the original document on the lower side to thereby suppress the original document on the lower side from being conveyed further down stream.
- An aligning roller 15 as a first roller comes into contact with the original document conveyed by the paper feeding roller 13 to correct a tilt of the original document.
- the aligning roller 15 includes two roller set in contact with each other. The aligning roller 15 brings the original document into contact with a nip section where the rollers are in contact with each other to be bent to thereby correct the tilt of the original document.
- a motor driving unit 30 drives the pickup roller 12 , the paper feeding roller 13 , and the aligning roller 15 .
- the motor driving unit 30 includes a motor driver 31 and a document feeding motor 32 .
- the document feeding motor 32 may be a stepping motor.
- the controller 801 outputs a pulse signal to the motor driver 31 .
- the motor driver 31 supplies driving current to the document feeding motor 32 on the basis of the received pulse signal.
- the controller 801 controls the number of pulses of the pulse signal output to the motor driver 31 to thereby control an amount of driving of the document feeding motor 32 .
- the document feeding motor 32 normally rotates, whereby the pickup roller 12 and the paper feeding roller 13 rotate.
- the document feeding motor 32 reversely rotates, whereby the aligning roller 15 rotates.
- An aligning sensor 16 is located between the separation roller 14 and the aligning roller 15 .
- the aligning sensor 16 detects arrival of the original document conveyed by the separation roller 14 .
- a double-feed detecting unit 17 is located between the aligning roller 15 and the aligning sensor 16 .
- the double-feed detecting unit 17 may be a non-contact sensor.
- the non-contact sensor may be an ultrasonic sensor.
- the double-feed detecting unit 17 When the double-feed detecting unit 17 is the ultrasonic sensor, the double-feed detecting unit 17 includes an ultrasound generating unit 17 a and an ultrasound receiving unit 17 b.
- the ultrasound generating unit 17 a and the ultrasound receiving unit 17 b are opposed to each other across the conveying path for the original document.
- the ultrasound generating unit 17 a is located further on a downstream side in the conveying direction of the original document than the ultrasound receiving unit 17 b.
- the ultrasound generating unit 17 a and the ultrasound receiving unit 17 b may be obliquely opposed to each other with respect to the conveying path for the original document. Since the ultrasound sound generating unit 17 a and the ultrasound receiving unit 17 b are obliquely opposed to each other, detection accuracy is improved.
- the ultrasound receiving unit 17 b receives ultrasound output by the ultrasound generating unit 17 a.
- the ultrasound penetrated into the original document is attenuated.
- the ultrasound receiving unit 17 b outputs a signal corresponding to the intensity of the received ultrasound to the controller 801 .
- the intensity of the ultrasound received by the ultrasound receiving unit 17 b is smaller than that of the ultrasound received in a normal case, i.e., when one original document is detected.
- the controller 801 discriminates, according to the intensity of the signal output from the ultrasound receiving unit 17 b, whether the original documents are double-fed.
- the controller 801 controls driving timing for the aligning roller 15 such that the original document coming into contact with the aligning roller 15 to be bent is conveyed to be timed to coincide with a toner image formed on the intermediate transfer belt 6 .
- the controller 801 controls the solenoid driving unit 40 to thereby move down the pickup roller 12 toward a pickup position for picking up an original document placed on the document tray 11 .
- the controller 801 controls the motor driving unit 30 to thereby drive the pickup roller 12 and the paper feeding roller 13 .
- the original document picked up by the pickup roller 12 moves downstream.
- the controller 801 determines whether the aligning sensor 16 detects the original document.
- the controller 801 proceeds to Act 104 .
- the controller 801 starts counting of the number of pulses output to the motor driver 31 .
- the controller 801 determines whether the counted number of pulses reaches N1. If the number of pulses reaches N1, the controller 801 proceeds to Act 106 .
- the controller 801 stops the driving of the motor driving unit 30 and stops the conveyance of the original document.
- a position where the conveyance of the original document is stopped is a double-feed detection position where double-feed detection is performed by the double-feed detecting unit 17 .
- FIG. 5 is a sectional view of the auto document feeder, wherein the original document located in the double-feed detection position is schematically shown. Referring to the figure, the original document stops before coming into contact with the aligning roller 15 and is located along the conveying path without being bent.
- the stop control for the original document is performed by using a detection result of the aligning sensor 16 located between the paper feeding roller 13 and the aligning roller 15 . Therefore, fluctuation in the double-feed detection position is suppressed.
- the controller 801 determines, on the basis of a signal output by the ultrasound receiving unit 17 b, whether the original documents are double-fed. Since the original document is located flat along the conveying path without being bent, accuracy of double-feed detection is improved.
- Act 108 the controller 801 displays indication of the double-feed on the operation display unit 805 . If the original documents are not double-fed, the controller 801 proceeds to Act 109 .
- the controller 801 drives the motor driving unit 30 again and rotates the paper feeding roller 13 .
- the controller 801 starts counting of the number of pulses output to the motor driver 31 .
- the controller 801 determines whether the counted number of pulses reaches N2. If the number of pulses reaches N2, the controller 801 proceeds to Act 112 and stops the driving of the motor driving unit 30 .
- FIG. 6 is a sectional view of the auto document feeder 9 , wherein the position of the original document at the time when the motor driving unit 30 stops is schematically shown. Referring to the figure, the original document is bent because the original document is prevented from being conveyed downstream by coming into contact with the aligning roller 15 .
- the controller 801 discriminates whether scanning timing is reached.
- the scanning timing means timing when the original document is located in the image reading position at the start of scanning by the scanning optical system 10 .
- the controller 801 controls the motor driving unit 30 to thereby reversely rotate the driving of the document feeding motor 32 and rotate the aligning roller 15 .
- the original document is nipped by the aligning roller 15 and moves to the image reading position.
- a conveying operation performed until the original document reaches from the aligning roller 15 to the image reading position is omitted.
- the controller 801 counts the number of pulses output to the motor driver 31 after the detection by the aligning sensor 16 .
- the controller 801 may count driving time of the paper feeding roller 13 .
- the controller 801 may measure time in which the paper feeding roller 13 performs the rotation operation and stop the motor driving unit 30 when the measured time reaches a predetermined time. It is also possible that the predetermined time is calculated from rotating speed of the paper feeding roller 13 , the calculated predetermined time is stored in the memory 803 , and the controller 801 reads out information concerning the predetermined time from the memory 803 and performs the control.
- the double-feed detecting unit 17 may be another non-contact sensor.
- the other non-contact sensor may be an optical sensor.
- the optical sensor includes a light emitting element and a light receiving element. The light emitting element and the light receiving element are located across an original document.
- the controller 801 discriminates presence or absence of double-feed from a light amount of light received by the light receiving element.
- the document feeding motor 32 may be a DC motor.
- the DC motor includes a photointerrupter in an output shaft.
- the controller 801 controls a driving amount of the DC motor according to the number of times the photointerrupter interrupts light.
- the auto document feeder 9 configured to convey an original document to the image reading position is explained.
- the embodiment can also be applied to a conveying system for a sheet fed from a cassette tray or a manual feed tray. Specifically, it is also possible to temporarily stop conveyance of the sheet in a position further on the upstream side in the conveying direction than an aligning roller included in the conveying system for the sheet fed from the cassette tray or the manual feed tray and perform the double-feed detection.
Abstract
According to an embodiment, a sheet conveying device includes: a first roller configured to correct a tilt of a sheet to be conveyed; a first detecting unit located further on an upstream side in a conveying direction of the sheet than the first roller and configured to detect information concerning double-feed of the sheet; a second roller configured to convey the sheet to the first roller; a driving unit configured to drive the second roller; and a controller configured to control the driving unit to thereby temporarily stop the conveyance of the sheet in order to perform the detection by the first detecting unit in a state in which an end of the sheet on a downstream side in the conveying direction of the sheet is located further on the upstream side in the conveying direction of the sheet than a nip position of the first roller.
Description
- This application is also based upon and claims the benefit of priority from U.S. provisional application 61/248910, filed on Oct. 6, 2009; the entire contents of which are incorporated herein by reference.
- Embodiments described herein relate generally to a technique for performing double-feed detection for a sheet.
- In the past, double-feed detection for an original document conveyed in an auto document feeder is performed in a state in which the original document is bent by bringing the original document into contact with an aligning roller that corrects a tilt of the original document.
- However, since a positional relation between a sensor that performs the double-feed detection and the original document is unstable, stable double-feed detection cannot be performed.
-
FIG. 1 is a sectional view of an image forming apparatus; -
FIG. 2 is a sectional view of an auto document feeder; -
FIG. 3 is a block diagram of components related to document conveyance by the auto document feeder; -
FIG. 4 is a flowchart for explaining the operation of the auto document feeder; -
FIG. 5 is a sectional view of the auto document feeder, wherein an original document located in a double-feed detection position is schematically shown; and -
FIG. 6 is a sectional view of the auto document feeder, wherein a position of the original document at the time when a motor driving unit stops is schematically shown. - In general, according to an embodiment, a sheet conveying device includes: a first roller configured to correct a tilt of a sheet to be conveyed; a first detecting unit located further on an upstream side in a conveying direction of the sheet than the first roller and configured to detect information concerning double-feed of the sheet; a second roller configured to convey the sheet to the first roller; a driving unit configured to drive the second roller; and a controller configured to control the driving unit to thereby temporarily stop the conveyance of the sheet in order to perform the detection by the first detecting unit in a state in which an end of the sheet on a downstream side in the conveying direction of the sheet is located further on the upstream side in the conveying direction of the sheet than a nip position of the first roller.
-
FIG. 1 is a sectional view of an image forming apparatus. An image forming apparatus 1 may be a MFP (Multi Function Printer). - Referring to
FIG. 1 , the image forming apparatus 1 includes an image reading unit R and an image forming unit P. The image reading unit R scans and reads images of a sheet document and a book document. - The image forming unit P forms a developer image on a sheet on the basis of an image read from an original document by the image reading unit R or print data transmitted to the image forming apparatus 1 by an external apparatus.
- The image reading unit R includes an auto document feeder (ADF) 9 configured to automatically convey an original document to a predetermined image reading position. The image reading unit R reads, with a scanning
optical system 10, an image of an original document automatically conveyed by theauto document feeder 9 and placed on a document tray (a predetermined document placing table) Rt or an original document placed on a not-shown document table. - The image forming unit P includes
toner cartridges 1Y to 1K,photoconductive members 2Y to 2K, developingrollers 3Y to 3K,mixers 4Y to 4K, anintermediate transfer belt 6, a fixing device 7, and adischarge tray 8. - The image forming apparatus 1 according to this embodiment includes a
controller 801, amemory 803, anoperation display unit 805, and a communication unit 807. - The
controller 801 has a role of performing various kinds of processing in the image forming apparatus 1 and also has a role of realizing various functions by executing computer programs stored in thememory 803. Thememory 803 may be, for example, a RAM (Random Access Memory), a ROM (Read Only Memory), a DRAM (Dynamic Random Access Memory), an SRAM (Static Random Access Memory), or a VRAM (Video RAM). Thememory 803 has a role of storing various kinds of information and computer programs used in the image forming apparatus 1. - Various kinds of setting are displayed on the
operation display unit 805. Theoperation display unit 805 may be an LCD (Liquid Crystal Display), an EL (Electronic Luminescence), a PDP (Plasma Display Panel), or a CRT (Cathode Ray Tube). - The various kinds of setting are changed by operating the
operation display unit 805. Theoperation display unit 805 may be a touch panel type. - An overview of copying is explained below as an example of processing in the image forming apparatus according to this embodiment.
- First, sheets picked up from cassettes enter a sheet conveying path. The sheets entered the sheet conveying path are moved in a predetermined conveying direction by plural roller pairs.
- Images of plural sheet documents continuously automatically conveyed by the
auto document feeder 9 are read by the scanningoptical system 10 in the predetermined image reading position. - On the basis of print data of the images read from the original documents by the image reading unit R, electrostatic latent images are formed on photoconductive surfaces of the
photoconductive members - Subsequently, developers agitated by the
mixers 4Y to 4K in a developing device are deposited by the developingrollers 3Y to 3K on thephotoconductive members 2Y to 2K on which the electrostatic latent images are formed as explained above. Consequently, the electrostatic latent images formed on the photoconductive surfaces of the photoconductive members are visualized. - Developer images formed on the photoconductive members in this way are transferred onto a belt surface of the intermediate transfer belt 6 (so-called primary transfer). The developer images conveyed by the rotation of the
intermediate transfer belt 6 are transferred onto the conveyed sheets in a predetermined secondary transfer position T. - The developer images transferred onto the sheets are heated and fixed on the sheets by the fixing device 7. The sheets having the developer images heated and fixed thereon are conveyed in the conveying path by plural conveying roller pairs and sequentially discharged onto the
discharge tray 8. - The
auto document feeder 9 is explained below.FIG. 2 is an enlarged sectional view of the auto document feeder. An original document is set on adocument tray 11. The document may be plural documents or one document. - A
pickup roller 12 as a third roller picks up the original document located on thedocument tray 11 and conveys the original document to apaper feeding roller 13 as a second roller. Thepaper feeding roller 13 conveys the original document picked up by thepickup roller 12 to downstream in the conveying direction. Rotating shaft sections of thepickup roller 12 and thepaper feeding roller 13 are connected to each other via atransmission mechanism 18. Thetransmission mechanism 18 may be a belt or a pulley. -
FIG. 3 is a block diagram of components related to document conveyance by theauto document feeder 9. Referring to the figure, thepickup roller 12 moves up and down according to the operation of asolenoid driving unit 40. Thesolenoid driving unit 40 includes asolenoid driver 41 and apickup solenoid 42. - Referring to
FIG. 2 , aseparation roller 14 as a fourth roller is located to be opposed to thepaper feeding roller 13. When thepickup roller 12 picks up two or more original documents, a load of a torque limiter of theseparation roller 14 is increased by frictional force of the original documents and theseparation roller 14 stops. The stoppedseparation roller 14 comes into contact with the original document on the lower side to thereby suppress the original document on the lower side from being conveyed further down stream. - An aligning
roller 15 as a first roller comes into contact with the original document conveyed by thepaper feeding roller 13 to correct a tilt of the original document. The aligningroller 15 includes two roller set in contact with each other. The aligningroller 15 brings the original document into contact with a nip section where the rollers are in contact with each other to be bent to thereby correct the tilt of the original document. - Referring to
FIG. 3 , amotor driving unit 30 drives thepickup roller 12, thepaper feeding roller 13, and the aligningroller 15. Themotor driving unit 30 includes amotor driver 31 and adocument feeding motor 32. - The
document feeding motor 32 may be a stepping motor. Thecontroller 801 outputs a pulse signal to themotor driver 31. Themotor driver 31 supplies driving current to thedocument feeding motor 32 on the basis of the received pulse signal. - The
controller 801 controls the number of pulses of the pulse signal output to themotor driver 31 to thereby control an amount of driving of thedocument feeding motor 32. - The
document feeding motor 32 normally rotates, whereby thepickup roller 12 and thepaper feeding roller 13 rotate. Thedocument feeding motor 32 reversely rotates, whereby the aligningroller 15 rotates. - An aligning
sensor 16 is located between theseparation roller 14 and the aligningroller 15. The aligningsensor 16 detects arrival of the original document conveyed by theseparation roller 14. - A double-
feed detecting unit 17 is located between the aligningroller 15 and the aligningsensor 16. The double-feed detecting unit 17 may be a non-contact sensor. The non-contact sensor may be an ultrasonic sensor. - When the double-
feed detecting unit 17 is the ultrasonic sensor, the double-feed detecting unit 17 includes anultrasound generating unit 17 a and anultrasound receiving unit 17 b. Theultrasound generating unit 17 a and theultrasound receiving unit 17 b are opposed to each other across the conveying path for the original document. Theultrasound generating unit 17 a is located further on a downstream side in the conveying direction of the original document than theultrasound receiving unit 17 b. Theultrasound generating unit 17 a and theultrasound receiving unit 17 b may be obliquely opposed to each other with respect to the conveying path for the original document. Since the ultrasoundsound generating unit 17 a and theultrasound receiving unit 17 b are obliquely opposed to each other, detection accuracy is improved. - The
ultrasound receiving unit 17 b receives ultrasound output by theultrasound generating unit 17 a. The ultrasound penetrated into the original document is attenuated. When the number of original documents increases, a degree of the attenuation increases. Theultrasound receiving unit 17 b outputs a signal corresponding to the intensity of the received ultrasound to thecontroller 801. - When original documents entered a position for detection by the double-
feed detecting unit 17 are superimposed, the intensity of the ultrasound received by theultrasound receiving unit 17 b is smaller than that of the ultrasound received in a normal case, i.e., when one original document is detected. Thecontroller 801 discriminates, according to the intensity of the signal output from theultrasound receiving unit 17 b, whether the original documents are double-fed. - The
controller 801 controls driving timing for the aligningroller 15 such that the original document coming into contact with the aligningroller 15 to be bent is conveyed to be timed to coincide with a toner image formed on theintermediate transfer belt 6. - The operation of the
auto document feeder 9 is explained with reference to a flowchart ofFIG. 4 . In Act 101, thecontroller 801 controls thesolenoid driving unit 40 to thereby move down thepickup roller 12 toward a pickup position for picking up an original document placed on thedocument tray 11. - In Act 102, the
controller 801 controls themotor driving unit 30 to thereby drive thepickup roller 12 and thepaper feeding roller 13. The original document picked up by thepickup roller 12 moves downstream. In Act 103, thecontroller 801 determines whether the aligningsensor 16 detects the original document. - If the aligning
sensor 16 detects the original document, thecontroller 801 proceeds to Act 104. In Act 104, thecontroller 801 starts counting of the number of pulses output to themotor driver 31. - In Act 105, the
controller 801 determines whether the counted number of pulses reaches N1. If the number of pulses reaches N1, thecontroller 801 proceeds to Act 106. - The
controller 801 stops the driving of themotor driving unit 30 and stops the conveyance of the original document. A position where the conveyance of the original document is stopped is a double-feed detection position where double-feed detection is performed by the double-feed detecting unit 17. - N1 is set such that an end of the original document on the downstream side in the conveying direction of the original document is located further on an upstream side in the conveying direction than the nip section of the aligning
roller 15.FIG. 5 is a sectional view of the auto document feeder, wherein the original document located in the double-feed detection position is schematically shown. Referring to the figure, the original document stops before coming into contact with the aligningroller 15 and is located along the conveying path without being bent. - Even if a slip occurs when the original document is conveyed by the
pickup roller 12 and thepaper feeding roller 13, the slip does not affect the stop control for the original document. Specifically, the stop control for the original document is performed by using a detection result of the aligningsensor 16 located between thepaper feeding roller 13 and the aligningroller 15. Therefore, fluctuation in the double-feed detection position is suppressed. - In Act 107, the
controller 801 determines, on the basis of a signal output by theultrasound receiving unit 17 b, whether the original documents are double-fed. Since the original document is located flat along the conveying path without being bent, accuracy of double-feed detection is improved. - If the original documents are double-fed, in Act 108, the
controller 801 displays indication of the double-feed on theoperation display unit 805. If the original documents are not double-fed, thecontroller 801 proceeds to Act 109. - In Act 109, the
controller 801 drives themotor driving unit 30 again and rotates thepaper feeding roller 13. In Act 110, thecontroller 801 starts counting of the number of pulses output to themotor driver 31. - In Act 111, the
controller 801 determines whether the counted number of pulses reaches N2. If the number of pulses reaches N2, thecontroller 801 proceeds to Act 112 and stops the driving of themotor driving unit 30. -
FIG. 6 is a sectional view of theauto document feeder 9, wherein the position of the original document at the time when themotor driving unit 30 stops is schematically shown. Referring to the figure, the original document is bent because the original document is prevented from being conveyed downstream by coming into contact with the aligningroller 15. - In Act 113, the
controller 801 discriminates whether scanning timing is reached. The scanning timing means timing when the original document is located in the image reading position at the start of scanning by the scanningoptical system 10. - In Act 114, the
controller 801 controls themotor driving unit 30 to thereby reversely rotate the driving of thedocument feeding motor 32 and rotate the aligningroller 15. The original document is nipped by the aligningroller 15 and moves to the image reading position. A conveying operation performed until the original document reaches from the aligningroller 15 to the image reading position is omitted. - As a method of stopping an original document in the double-feed detection position, the
controller 801 counts the number of pulses output to themotor driver 31 after the detection by the aligningsensor 16. However, thecontroller 801 may count driving time of thepaper feeding roller 13. Specifically, thecontroller 801 may measure time in which thepaper feeding roller 13 performs the rotation operation and stop themotor driving unit 30 when the measured time reaches a predetermined time. It is also possible that the predetermined time is calculated from rotating speed of thepaper feeding roller 13, the calculated predetermined time is stored in thememory 803, and thecontroller 801 reads out information concerning the predetermined time from thememory 803 and performs the control. - The double-
feed detecting unit 17 may be another non-contact sensor. The other non-contact sensor may be an optical sensor. The optical sensor includes a light emitting element and a light receiving element. The light emitting element and the light receiving element are located across an original document. Thecontroller 801 discriminates presence or absence of double-feed from a light amount of light received by the light receiving element. - The
document feeding motor 32 may be a DC motor. The DC motor includes a photointerrupter in an output shaft. Thecontroller 801 controls a driving amount of the DC motor according to the number of times the photointerrupter interrupts light. - In the embodiment, the
auto document feeder 9 configured to convey an original document to the image reading position is explained. However, the embodiment can also be applied to a conveying system for a sheet fed from a cassette tray or a manual feed tray. Specifically, it is also possible to temporarily stop conveyance of the sheet in a position further on the upstream side in the conveying direction than an aligning roller included in the conveying system for the sheet fed from the cassette tray or the manual feed tray and perform the double-feed detection. - While certain embodiments have been described, these embodiments have been presented by way of example only, and are not intended to limit the scope of invention. Indeed, the novel apparatus and methods described herein may be embodied in a variety of other forms; furthermore, various omissions, substitutions and changes in the form of the apparatus and methods described herein may be made without departing from the sprit of the inventions. The accompanying claims and their equivalents are intended to cover such forms or modifications as would fall within the scope and spirit of the inventions.
Claims (20)
1. A sheet conveying device comprising:
a first roller configured to correct a tilt of a sheet to be conveyed;
a first detecting unit located further on an upstream side in a conveying direction of the sheet than the first roller and configured to detect information concerning double-feed of the sheet;
a second roller configured to convey the sheet to the first roller;
a driving unit configured to drive the second roller; and
a controller configured to control the driving unit to thereby temporarily stop the conveyance of the sheet in order to perform the detection by the first detecting unit in a state in which an end of the sheet on a downstream side in the conveying direction of the sheet is located further on the upstream side in the conveying direction of the sheet than a nip position of the first roller.
2. The device according to claim 1 , further comprising a second detecting unit located between the second roller and the first detecting unit and configured to detect entrance of the sheet, wherein
the controller starts, when the second detecting unit detects the entrance of the sheet, control for stopping the sheet in a position of the detection by the first detecting unit.
3. The device according to claim 2 , wherein
the driving unit includes:
a pulse motor; and
a driver for the pulse motor, and
the controller stars, when the second detecting unit detects the entrance of the sheet, counting of a number of pulses output to the driver and stops the sheet in the position of the detection by the first detecting unit on the basis of a result of the counting.
4. The device according to claim 1 , wherein the first detecting unit is a non-contact detecting unit.
5. The device according to claim 4 , wherein
the first detecting unit includes:
an ultrasound generating unit configured to generate ultrasound; and
an ultrasound receiving unit configured to receive the ultrasound generated by the ultrasound generating unit, and
the ultrasound generating unit and the ultrasound receiving unit are opposed to each other across a conveying path for the sheet.
6. The device according to claim 5 , wherein the ultrasound generating unit is located further downstream in the conveying direction of the sheet than the ultrasound receiving unit.
7. The device according to claim 2 , wherein the second detecting unit is located below a conveying path for the sheet .
8. The device according to claim 1 , further comprising a third roller configured to pick up the sheet to the second roller, wherein
the second and third rollers are connected by a transmission mechanism.
9. The device according to claim 8 , wherein the second roller is opposed to a fourth roller, the fourth roller inhibits double-feed of the sheet picked up by the third roller.
10. An image forming apparatus comprising:
a document conveying unit including:
a first roller configured to correct a tilt of an original document to be conveyed;
a first detecting unit located further on an upstream side in a conveying direction of the original document than the first roller and configured to detect information concerning double-feed of the original document;
a second roller configured to convey the original document to the first roller; and
a driving unit configured to drive the second roller;
a reading unit configured to optically read the original document conveyed by the document conveying unit;
an image forming unit configured to form an image on a sheet on the basis of image data read by the reading unit; and
a controller configured to control the driving unit to thereby temporarily stop the conveyance of the original document in order to perform the detection by the first detecting unit in a state in which an end of the original document on a downstream side in the conveying direction of the original document is located further on the upstream side in the conveying direction of the original document than a nip position of the first roller.
11. The apparatus according to claim 10 , wherein
the document conveying unit further includes a second detecting unit located between the second roller and the first detecting unit and configured to detect entrance of the original document, and
the controller starts, when the second detecting unit detects the entrance of the original document, control for stopping the original document in a position of the detection by the first detecting unit.
12. The apparatus according to claim 11 , wherein
the driving unit includes:
a pulse motor; and
a driver for the pulse motor, and
the controller stars, when the second detecting unit detects the entrance of the original document, counting of a number of pulses output to the driver and stops the original document in the position of the detection by the first detecting unit on the basis of a result of the counting.
13. The apparatus according to claim 10 , wherein the first detecting unit is a non-contact detecting unit.
14. The apparatus according to claim 13 , wherein
the first detecting unit includes:
an ultrasound generating unit configured to generate ultrasound; and
an ultrasound receiving unit configured to receive the ultrasound generated by the ultrasound generating unit, and
the ultrasound generating unit and the ultrasound receiving unit are opposed to each other across a conveying path for the original document.
15. The apparatus according to claim 14 , wherein the ultrasound generating unit is located further downstream in the conveying direction of the original document than the ultrasound receiving unit.
16. The apparatus according to claim 11 , wherein the second detecting unit is located below a conveying path for the original document.
17. The apparatus according to claim 10 , wherein
the document conveying unit further includes a third roller configured to pick up the original document to the second roller, and
the second and third rollers are connected by a transmission mechanism.
18. The apparatus according to claim 17 , wherein the second roller is opposed to a fourth roller, the fourth roller inhibits double-feed of the original document picked up by the third roller.
19. A method of detecting double-feed of a sheet comprising performing double-feed detection for the sheet in a state in which an end of the sheet on a downstream side in a conveying direction of the sheet is located further on an upstream side in the conveying direction of the sheet than a nip position of a roller configured to correct a tilt of the sheet.
20. The method according to claim 19 , wherein the double-feed detection is performed by a non-contact sensor.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/897,761 US20110084443A1 (en) | 2009-10-06 | 2010-10-04 | Sheet conveying device, image forming apparatus, and method of detecting double-feed of sheet |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US24891009P | 2009-10-06 | 2009-10-06 | |
US12/897,761 US20110084443A1 (en) | 2009-10-06 | 2010-10-04 | Sheet conveying device, image forming apparatus, and method of detecting double-feed of sheet |
Publications (1)
Publication Number | Publication Date |
---|---|
US20110084443A1 true US20110084443A1 (en) | 2011-04-14 |
Family
ID=43854210
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/897,761 Abandoned US20110084443A1 (en) | 2009-10-06 | 2010-10-04 | Sheet conveying device, image forming apparatus, and method of detecting double-feed of sheet |
Country Status (2)
Country | Link |
---|---|
US (1) | US20110084443A1 (en) |
CN (1) | CN102030207A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20110317230A1 (en) * | 2010-06-25 | 2011-12-29 | Brother Kogyo Kabushiki Kaisha | Sheet detecting device, double feed determining device, and image reading apparatus using the same |
US8496245B2 (en) * | 2011-09-26 | 2013-07-30 | Burroughs, Inc. | Double document detection apparatus and a method for conducting the same |
JP2014024632A (en) * | 2012-07-26 | 2014-02-06 | Canon Inc | Sheet feeding apparatus and image forming apparatus |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR101515806B1 (en) * | 2013-11-04 | 2015-05-04 | 코닝정밀소재 주식회사 | Method and apparatus of manufacturing a sheet |
US9197775B2 (en) * | 2014-01-23 | 2015-11-24 | Fuji Xerox Co., Ltd. | Image reading device, copier, and image forming apparatus |
JP6620517B2 (en) * | 2015-10-28 | 2019-12-18 | セイコーエプソン株式会社 | Image reading apparatus and image reading method |
JP6988334B2 (en) * | 2017-09-29 | 2022-01-05 | セイコーエプソン株式会社 | Image reader |
JP7187952B2 (en) * | 2018-10-02 | 2022-12-13 | 富士フイルムビジネスイノベーション株式会社 | Double feed detection device, paper transport device and program |
JP7211211B2 (en) | 2019-03-29 | 2023-01-24 | コニカミノルタ株式会社 | Sheet conveying device, image reading device and image forming device |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20050269759A1 (en) * | 2004-06-08 | 2005-12-08 | Nisca Corporation | Sheet feeding apparatus and method of detecting double feed |
US20080106027A1 (en) * | 2006-09-01 | 2008-05-08 | Fuminori Miyoshii | Sheet feeding apparatus, and document feeding apparatus and image processing apparatus including the same |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3291065B2 (en) * | 1993-03-22 | 2002-06-10 | デュプロ精工株式会社 | Stencil printing machine |
JP4377666B2 (en) * | 2003-12-04 | 2009-12-02 | ニスカ株式会社 | Sheet feeding apparatus and image reading apparatus |
JP4199790B2 (en) * | 2006-09-01 | 2008-12-17 | シャープ株式会社 | Image processing device |
JP2008254895A (en) * | 2007-04-05 | 2008-10-23 | Sharp Corp | Image forming device |
-
2010
- 2010-09-20 CN CN2010102930670A patent/CN102030207A/en active Pending
- 2010-10-04 US US12/897,761 patent/US20110084443A1/en not_active Abandoned
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20050269759A1 (en) * | 2004-06-08 | 2005-12-08 | Nisca Corporation | Sheet feeding apparatus and method of detecting double feed |
US20080106027A1 (en) * | 2006-09-01 | 2008-05-08 | Fuminori Miyoshii | Sheet feeding apparatus, and document feeding apparatus and image processing apparatus including the same |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20110317230A1 (en) * | 2010-06-25 | 2011-12-29 | Brother Kogyo Kabushiki Kaisha | Sheet detecting device, double feed determining device, and image reading apparatus using the same |
US8531742B2 (en) * | 2010-06-25 | 2013-09-10 | Brother Kogyo Kabushiki Kaisha | Sheet detecting device, double feed determining device, and image reading apparatus using the same |
US8496245B2 (en) * | 2011-09-26 | 2013-07-30 | Burroughs, Inc. | Double document detection apparatus and a method for conducting the same |
JP2014024632A (en) * | 2012-07-26 | 2014-02-06 | Canon Inc | Sheet feeding apparatus and image forming apparatus |
Also Published As
Publication number | Publication date |
---|---|
CN102030207A (en) | 2011-04-27 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US20110084443A1 (en) | Sheet conveying device, image forming apparatus, and method of detecting double-feed of sheet | |
US7497430B2 (en) | Image forming apparatus, image forming method, and sheet feeding apparatus capable of effectively feeding sheets | |
US8882107B2 (en) | Sheet conveyance device, document feeder, image forming apparatus, and multi feed detection method | |
US7068969B2 (en) | Method and apparatus for image forming capable of performing fast and stable sheet transfer operations | |
US8684350B2 (en) | Sheet adjusting device, sheet holding receptacle incorporating same, and image forming apparatus incorporating same | |
US9670019B2 (en) | Paper feed device, and document transport device and image forming apparatus including the same | |
CN111856901B (en) | Image forming apparatus | |
US11186104B2 (en) | Image forming system | |
US11884504B2 (en) | Sheet conveying device capable of preventing paper jam, image reading apparatus, sheet conveying method | |
US20110272876A1 (en) | Sheet conveying device, image forming apparatus, and sheet conveying method | |
US8833765B2 (en) | Paper sheet conveying apparatus and image forming apparatus | |
JP2016179868A (en) | Paper feeding device and control program of paper feeding device | |
US11150586B2 (en) | Image forming system | |
US10924619B2 (en) | Image forming system | |
US20210032058A1 (en) | Conveyor device | |
US20240051775A1 (en) | Sheet feeding device and image forming apparatus incorporating the sheet feeding device | |
JP5962034B2 (en) | Document conveying apparatus and image forming apparatus | |
JP2021135339A (en) | Image forming apparatus | |
JP2023058746A (en) | Sheet feeding apparatus, image reading apparatus, and image forming apparatus | |
JP2024024580A (en) | Sheet feeding device and image forming device | |
JP2020196598A (en) | Sheet conveyance device, document reading apparatus and image formation apparatus | |
JP4876035B2 (en) | Sheet material conveying apparatus, document conveying apparatus, paper feeding apparatus, and image forming apparatus | |
JP2001166663A (en) | Image forming device | |
JP2020196599A (en) | Sheet conveyance device, document reading apparatus and image formation apparatus | |
JP2020196600A (en) | Sheet conveyance device, document reading apparatus and image formation apparatus |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: TOSHIBA TEC KABUSHIKI KAISHA, JAPAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:IINO, SEIJI;REEL/FRAME:025089/0257 Effective date: 20101001 Owner name: KABUSHIKI KAISHA TOSHIBA, JAPAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:IINO, SEIJI;REEL/FRAME:025089/0257 Effective date: 20101001 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |