US20070001366A1 - Image forming apparatus - Google Patents

Image forming apparatus Download PDF

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Publication number
US20070001366A1
US20070001366A1 US11/452,951 US45295106A US2007001366A1 US 20070001366 A1 US20070001366 A1 US 20070001366A1 US 45295106 A US45295106 A US 45295106A US 2007001366 A1 US2007001366 A1 US 2007001366A1
Authority
US
United States
Prior art keywords
sheet feeding
sheets
image forming
sheet
usage frequency
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
Application number
US11/452,951
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English (en)
Inventor
Takashi Yano
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Canon Inc
Original Assignee
Canon Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Canon Inc filed Critical Canon Inc
Assigned to CANON KABUSHIKI KAISHA reassignment CANON KABUSHIKI KAISHA ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: YANO, TAKASHI
Publication of US20070001366A1 publication Critical patent/US20070001366A1/en
Abandoned legal-status Critical Current

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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
    • B65H3/00—Separating articles from piles
    • B65H3/44—Simultaneously, alternately, or selectively separating articles from two or more piles
    • 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
    • B65H2513/00—Dynamic entities; Timing aspects
    • B65H2513/40—Movement
    • B65H2513/42—Route, path
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2601/00—Problem to be solved or advantage achieved
    • B65H2601/40—Increasing or maximizing
    • B65H2601/42—Increasing or maximizing entities relating to the handling machine
    • B65H2601/423—Life span
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2601/00—Problem to be solved or advantage achieved
    • B65H2601/50—Diminishing, minimizing or reducing
    • B65H2601/52—Diminishing, minimizing or reducing entities relating to handling machine
    • B65H2601/522—Wear of friction surface

Definitions

  • the present invention relates to an image forming apparatus having a plurality of sheet feeding sections.
  • the image forming apparatus such as a copier and printer is provided with a plurality of feeding trays. Different kinds of sheets are often set in these feeding trays depending on user's usage purpose. In the meantime, the “different kinds” means that at least one of various parameters for specifying the sheet, such as its material, thickness, size is different.
  • the controller of the image forming apparatus selects a feeding tray in which sheets of material and thickness specified by user are accommodated or a feeding tray in which sheets of a size suitable for the size of image to be formed are accommodated and starts image forming operation.
  • An ordinary feeding apparatus conveys and separates the sheets using a rubber roller or rubber pad. These members are worn and deteriorated as the quantity of sheets increases and their surfaces are deteriorated when they are left in an unused state for a long time. when this deterioration progresses, the friction coefficient of a contact face with the sheet drops or the conveyance amount drops due to wearing of the outer periphery of the roller, so that a jam due to a conveyance delay or double feeding occurs. This state is called fulfilled service life of the feeding roller or separating pad.
  • this feeding portion including a plurality of sheet storage portions for accommodating sheets of the same size and material is provided with a selecting means for selecting a sheet storage portion from which sheets are to be fed, in order to equalize the accumulation feeding frequency of each sheet storage portion.
  • an object of the present invention is to provide an image forming apparatus capable of reducing a difference in the usage frequency among the plurality of the sheet feeding sections.
  • an image forming apparatus comprising:
  • an accumulation feeding quantity counting means for counting the accumulation quantity of fed sheets of each of the plural sheet feeding sections
  • control means which determines the bias of usage frequency of each sheet feeding sections based on a counting result of the accumulation feeding quantity counting means and changes the allocation of the sheets of each sheet feeding sections to reduce the bias of the usage frequency of each sheet feeding sections.
  • the present invention can reduce the difference in the usage frequency among the plurality of the sheet feeding sections.
  • FIG. 1 is a flow chart showing an example of frequency equalizing processing of the embodiment of the present invention
  • FIG. 2 is a diagram showing an example of the profile of each feeding tray of the present invention.
  • FIG. 3 is a diagram showing an example of the profile after the kinds of sheets used in each feeding tray of the invention are reallocated
  • FIG. 4 is a diagram showing an example of the profile of each feeding tray of the invention.
  • FIG. 5 is a diagram showing an example of the profile after the kinds of sheets used in each feeding tray of the invention are reallocated
  • FIG. 6 is a schematic sectional view of an image forming apparatus of the embodiment of the present invention.
  • FIG. 7 is a block diagram of a control portion of the embodiment of the present invention.
  • FIG. 6 shows the image forming apparatus according to an embodiment of the present invention.
  • An image forming apparatus 100 comprises a printer main body 1 for forming an image on a sheet and a reading portion 2 for a case where it is made to function as a copier. Although this embodiment will be described about a copier type image forming apparatus having the reading portion, the present invention may be applied to a printer type image forming apparatus having no reading portion.
  • a laser scanner 11 for writing an image to a photosensitive drum 12 is provided on the top of the printer main body 1 .
  • Print data sent from an external apparatus such as a personal computer is received by a controller 40 which controls the printer main body 1 and outputted to a laser scanner 11 as written image data.
  • a plurality of sheet feeding sections 30 a, 30 b, 30 c, 30 d capable of feeding different kinds of sheets are located in the uppermost stream of sheet conveyance.
  • the sheet feeding sections 30 a to 30 d are provided in line vertically in the bottom portion of the apparatus.
  • the sheet feeding sections 30 a, 30 b, 30 c, 30 d include feeding trays A, B, C, D for stacking and storing the sheets S and feeding portions 31 a, 31 b, 31 c, 31 d which separate the sheets S stored in the feeding tray and feed them.
  • the feeding portion 31 a (because the feeding portions 31 b, 31 c, 31 d have substantially the same structure as the feeding portion 31 a, description of those is omitted) includes a pickup roller 50 for picking up a sheet S in the feeding tray A, a feeding roller 51 for feeding the sheet S picked up by the pickup roller 50 and a separation roller 52 which opposes the feeding roller 51 for separating the sheets S by giving a separation force in a return direction to the sheet.
  • a conveyance roller pair 36 a ( 36 b, 36 c, 36 d ) which takes over the sheet S fed by the feeding roller 51 and after conveyance by the feeding roller 51 ends, pulls out the sheet from nipping between the feeding roller 51 and the separation roller 52 are provided in the downstream of the feeding roller 51 .
  • the conveyance roller pair 36 a has a role of taking over the sheet S conveyed through a longitudinal conveyance path 35 from a feeding section (for example, sheet feeding section 30 d ) located further in the upstream in addition to this pulling action.
  • a feeding section for example, sheet feeding section 30 d
  • FIG. 7 is a block diagram of the control portion according to an embodiment. As shown in FIG. 7 , an accumulation counter 40 a for measuring the quantity of fed sheets is incorporated in the controller 40 . The accumulation counter 40 a counts the quantity of fed sheets from each feeding tray in cooperation with a feeding action signal and its count value is stored in a memory 40 b.
  • a resist roller pair 81 is provided at the lowermost stream position of the longitudinal conveyance path 35 . This resist roller pair 81 executes the final skew correction of the sheet and matching of timing between image writing and sheet conveyance in the image forming portion.
  • the printer main body 1 includes a photosensitive drum 12 , charger 13 , laser scanner 11 , development portion 14 , transfer roller 19 and cleaner 26 .
  • the charger 13 charges the surface of the photosensitive drum 12 equally.
  • the laser scanner 11 forms an electrostatic latent image by irradiating light to the surface of the photosensitive drum 12 charged by the charger 13 .
  • the development portion 14 develops the electrostatic latent image as a toner image with developing agent.
  • the transfer roller 19 transfers a developed toner image to the sheet S.
  • the cleaner 26 removes toner left in the photosensitive drum 12 after the toner image is transferred.
  • a conveying portion 21 for conveying the sheet S after the toner image is transferred and a fixing portion 22 for fixing an image on the sheet S conveyed by this conveying portion 21 as a permanent image are provided in the downstream of the image forming portion.
  • a discharge roller 24 for discharging the sheet S after the image is fixed by the fixing portion 22 from the printer main body 1 is provided.
  • a discharged sheet stacking tray 25 which receives sheets S discharged by the discharge roller 24 is provided outside the top portion of the printer main body 1 .
  • the pickup roller 50 , the feeding roller 51 and the separation roller 52 equipped on the feeding portion 31 included in the sheet feeding section are worn (wasted) gradually with feeding of the sheets as described above.
  • the wearing of the feeding roller 51 and the separation roller 52 is large because the load upon feeding is large and they need to be replaced several times until the service life of the image forming apparatus is fulfilled.
  • the controller 40 is provided with a function for equalizing the usage frequency of each feeding tray as much as possible.
  • the controller 40 is provided with the accumulation counter 40 a for counting the quantity of sheets fed from each feeding tray and the accumulation quantity of the sheets fed from each feeding tray is measured and the measured value is stored in the memory 40 b of the controller 40 . Further, the controller 40 is also provided with a reservation counter 40 c for calculating a recent usage frequency of each sheet feeding sections in a predetermined period up to currently. This reservation counter 40 c measures the quantity of sheets fed in a specified period back with respect to currently and its value is always recorded in the memory 40 b of the controller 40 . That is, this value is used as a recent usage frequency of the sheets set in each feeding tray.
  • this period is set to a week by presuming the use condition of ordinary office.
  • the controller 40 has a bias detecting function for determining whether or not the use condition of each feeding tray is biased and a frequency equalizing function which when it is determined that the use condition is biased, estimates a sheet allocation to each feeding tray which can relax the bias.
  • FIG. 1 shows a schematic flow chart of this frequency equalizing processing.
  • the processing below can be executed in viewpoints of both hardware and software by the controller 40 as an estimating means in which a well known arithmetic operating means (CPU) 40 d and memory means (memory) 40 b are combined.
  • CPU arithmetic operating means
  • memory memory
  • the controller 40 refers to the value of the accumulation quantity of fed sheets by each sheet feeding sections measured by the accumulation counter 40 a.
  • step S 2 a difference DIF between a value Cmax of a sheet feeding section whose accumulation quantity of fed sheets is maximum and a value Cmin of a sheet feeding section whose accumulation quantity of fed sheets is minimum is compared with a set threshold TH.
  • the threshold TH is set to 30,000.
  • step S 3 the values measured by the reservation counter 40 c are referred to about those two feeding trays.
  • step S 4 a recent usage frequency is compared.
  • step S 5 it is determined that the bias of the usage frequency of the both feeding trays may not be improved in future and an alarm signal is outputted in step S 5 .
  • the usage frequencies of the both are in an opposite relation (No)
  • the difference of the accumulation quantity of fed sheets can be relaxed by a future print operation, so that no alarm signal is outputted and then, the processing is ended.
  • the usage frequency means the frequency at which the sheet feeding section feeds the sheet.
  • the usage frequency can be expressed as the quantity of sheets fed per a portion time.
  • the degree of wearing of the feeding roller, separation pad and the like can be estimated with such a usage frequency to some extent.
  • the frequency equalizing processing is triggered when the alarm signal is outputted in the bias detecting processing (step S 6 ).
  • the controller 40 introduces a sheet type preferred to be used in each feeding tray according to the accumulation quantity of fed sheets C by each sheet feeding sections measured by the accumulation counter 40 a and the recent usage frequency F of each sheet feeding sections (or type of sheet set in each feeding tray) measured by the reservation counter. when there exist a plurality of feeding trays for feeding the same kind of sheets, the controller 40 finds out which feeding tray should be used with preference.
  • the types of sheets to be used in each feeding tray are allocated to the feeding trays whose accumulation quantity of fed sheets is small with preference in order from sheet of material and size having the highest usage frequency currently. As a consequence, allocation of the type of the sheet recommended to be used in each feeding tray is determined so that the difference in usage frequency among the plurality of the sheet feeding sections can be reduced by a following sheet feeding operation.
  • the image forming apparatus of this embodiment can execute a scheduled operation using a timer and thus, bias check of the usage condition of each sheet feeding sections by the bias detecting processing is automatically executed at a predetermined time once a week.
  • the controller 40 outputs an instruction for the bias detecting processing of determining whether or not there exists a bias in the usage frequency of each feeding tray. Assume that when this instruction is dispatched, the profile of each feeding tray is as shown in FIG. 2 . At this time, the difference DIF between the value Cmax (43057) of a feeding tray A whose accumulation quantity of fed sheets is maximum and the value Cmin (12502) of a feeding tray D whose accumulation quantity of fed sheets is minimum is 30555. As described above, because the threshold TH for the bias determination is set to 30000 according to this embodiment, this difference DIF is over the threshold TH.
  • step S 6 When the alarm signal is outputted, the frequency equalizing processing is started (step S 6 ).
  • the result of an ideal allocation of the sheet type in each feeding tray obtained in the above-described processing is outputted to eliminate the bias of the usage frequency in a future image forming operation (step S 7 ).
  • the profile after the reallocation of the sheet types used in each feeding tray is as shown in FIG. 3 according to this embodiment.
  • This output result is displayed on a display portion as a notifying means for notifying user of the sheet allocation.
  • the notifying means of this embodiment may adopt a structure four notifying user with voice or blinking of a light emission device as well as the display portion such as the display portion described later.
  • a message recommending to change the allocation condition of the sheet types in each feeding tray to the profile shown in FIG. 3 is displayed on the display portion 3 of the image forming apparatus 100 (step S 8 ).
  • a thick paper A3 whose accumulation quantity of fed sheets is the smallest is set in the feeding tray A whose accumulation quantity of the fed sheets is the largest and a plain paper A3 whose accumulation quantity of the fed sheets is next to the smallest is set in the feeding tray C whose quantity of the fed sheets is next to the largest.
  • the feeding tray B has a next largest quantity
  • the plain paper A4 whose accumulation quantity of the fed sheets is the largest is set in the feeding tray B having a low usage frequency currently because the feeding tray D has a higher usage frequency currently.
  • user changes the allocation of the sheets to the feeding trays according to such an instruction. That is, as shown in FIG. 3 , the feeding trays are replaced so that the sheets of the types allocated to each feeding tray are stored therein (step S 9 ).
  • the difference in the quantity of the accumulation quantity of the fed sheets among the sheet feeding sections is eliminated gradually through a following print operation.
  • the bias of the accumulation quantity of fed sheets among the respective sheet feeding sections can be suppressed to a specific range by checking periodically with the bias detecting processing, so that the difference in the usage frequency among the plural sheet feeding sections can be reduced.
  • a preference order for use is allocated to the plurality of the feeding trays in which the same sheets are set and when there are left sheets in a feeding tray having a higher preference order, they are fed first of all necessarily.
  • the profile of the respective feeding trays is as shown in FIG. 4 .
  • a difference between the value Cmax (44160) of the feeding tray A whose accumulation quantity of fed sheets is maximum and the value Cmin (13022) of the feeding tray C whose accumulation quantity of fed sheets is minimum is 31138. Because the bias determination threshold TH of this embodiment is set to 30000, it comes that the value of this difference DIF is over the threshold TH.
  • step S 6 the procedure proceeds to step S 6 , in which the frequency equalizing processing is started.
  • An estimation result of the ideal allocation of the sheet type used in each feeding tray obtained in the previously described processing is outputted to eliminate the bias of the usage frequency in the image forming operation in the future naturally (S 7 ).
  • the profile after the types of the sheets used in each feeding tray are reallocated is as shown in FIG. 5 .
  • a higher selection preference order is automatically allocated to two feeding trays in which the plain papers of A4 size of the same kind are set in the order from a feeding tray to which the sheets are reallocated whose accumulation quantity of fed sheets is smaller.
  • a message which recommends user to change the allocation condition of sheets to each feeding tray to this profile is displayed on the display portion 3 of the image forming apparatus 100 (step S 8 ).
  • the procedure proceeds to step S 9 , in which user inputs a setting change to the display portion 3 and then, the procedure proceeds to step S 10 , in which the types of the sheets to be set in each feeding tray are replaced by the user actually.
  • the controller 40 recognizes the sheets of the types indicated on the display portion through a detecting means for detecting that they are loaded on the respective sheet feeding sections and this preference order is applied. Consequently, an error of replacement of the plural sheet types can be reduced by provision of such a detecting means.
  • the procedure proceeds to step S 11 , in which the values of the reservation counter are replaced corresponding to the feeding trays which replace the sheet types.
  • this embodiment adopts a structure of executing the bias detecting processing periodically by schedule control, this bias detecting processing may be executed necessarily within a predetermined time after the apparatus main body is powered on.
  • difference in accumulation quantity of fed sheets is always counted for each print job, then the above-described processing may be executed when the difference exceeds the threshold.
  • the above-described processing may be executed each time when the accumulation quantity of fed sheets to the apparatus main body reaches a predetermined number instead of the accumulation quantity of the fed sheets by the sheet feeding section. For example, that processing may be executed each time when the accumulation quantity of the fed sheets to the apparatus main body reaches 100,000.
  • Information of each sheet feeding sections for which the sheet allocation is changed may be transmitted to outside through communication means.
  • Such a structure enables the usage frequency of each sheet feeding sections to be notified to an outside service center or the like, thereby making it possible to estimate a replacement timing of the roller or separation pad to lead to effective maintenance.
  • the trigger of the bias detecting processing may be executed according to an instruction from outside by user or according to an instruction through remote control from an outside service station connected through communication line.
  • the reallocation processing of equalizing the degree of wearing of members used in each feeding tray is carried out by rearrangement of the feeding trays using comparison of difference of the accumulation quantity of fed sheets by the accumulation counter and the recent usage frequency by the reservation counter.
  • the present invention is not restricted to this processing algorithm. That is, when higher arithmetic operating processing can be executed on the controller side, more effective equalization is possible by recording history of previous size changes and the trend of the usage frequency of each sheet type and using such information for processing.
  • the degree of wearing of the feeding members such as the pickup roller, feeding roller and separation roller can be more equalized in each sheet feeding member.
  • the component replacement timing of each sheet feeding sections can be aligned thereby achieving effectiveness of maintenance.
  • each feeding tray are replaced.
  • the types of the sheets preferred to be fed by each sheet feeding sections may be replaced by replacing the sheet positions together with the feeding trays.
  • the difference of the usage frequency of the respective sheet feeding sections can be reduced not only among the plural sheet feeding sections loaded with the same type of sheets but also among the plural sheet feeding sections loaded with different type of sheets, which cannot be achieved conventionally.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sheets, Magazines, And Separation Thereof (AREA)
US11/452,951 2005-06-30 2006-06-15 Image forming apparatus Abandoned US20070001366A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2005191408A JP4659532B2 (ja) 2005-06-30 2005-06-30 画像形成装置
JP2005-191408 2005-06-30

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070057430A1 (en) * 2005-09-13 2007-03-15 Yasuko Yamazaki Image forming apparatus, sheet feeding source selection method, and recording medium
US20080232869A1 (en) * 2004-04-02 2008-09-25 Canon Kabushiki Kaisha Image fixing apparatus and image forming apparatus
US20110024967A1 (en) * 2009-07-28 2011-02-03 Canon Kabushiki Kaisha Managing apparatus, image forming apparatus, method of controlling the managing apparatus, and storage medium
US20200264814A1 (en) * 2019-02-14 2020-08-20 Canon Kabushiki Kaisha Sheet feeding apparatus, information processing method, and non-transitory computer-readable storage medium
US10791233B2 (en) * 2019-01-25 2020-09-29 Kyocera Document Solutions Inc. Image forming apparatus capable of performing a print job to print an image on a sheet being conveyed

Families Citing this family (3)

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Publication number Priority date Publication date Assignee Title
JP6281498B2 (ja) 2015-01-06 2018-02-21 コニカミノルタ株式会社 重送検知装置、シート搬送装置、および画像形成装置
US9996777B1 (en) * 2017-02-18 2018-06-12 Kyocera Document Solutions Inc. Image forming system, server, information processing method, and image forming apparatus that decrease paper jam
JP2019196246A (ja) * 2018-05-09 2019-11-14 京セラドキュメントソリューションズ株式会社 画像形成装置、給紙制御方法及び給紙制御プログラム

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JP4131325B2 (ja) * 2003-03-24 2008-08-13 富士ゼロックス株式会社 シート供給装置及び画像形成装置
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US4657239A (en) * 1983-07-20 1987-04-14 Ricoh Company, Ltd. Sheet aligning device
US4779861A (en) * 1986-10-07 1988-10-25 Oki Electric Industry Co., Ltd. Sheet separator/feeder
US5177545A (en) * 1990-08-02 1993-01-05 Minolta Camera Kabushiki Kaisha Image forming apparatus having an improved control system for a paper feed tray
US5207412A (en) * 1991-11-22 1993-05-04 Xerox Corporation Multi-function document integrater with control indicia on sheets
US5358238A (en) * 1993-04-27 1994-10-25 Xerox Corporation Shared user printer output dynamic "mailbox" system
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Cited By (9)

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Publication number Priority date Publication date Assignee Title
US20080232869A1 (en) * 2004-04-02 2008-09-25 Canon Kabushiki Kaisha Image fixing apparatus and image forming apparatus
US7486902B2 (en) 2004-04-02 2009-02-03 Canon Kabushiki Kaisha Image fixing apparatus and image forming apparatus
US20070057430A1 (en) * 2005-09-13 2007-03-15 Yasuko Yamazaki Image forming apparatus, sheet feeding source selection method, and recording medium
US7770880B2 (en) * 2005-09-13 2010-08-10 Ricoh Company, Ltd. Image forming apparatus, sheet feeding source selection method, and recording medium
US20110024967A1 (en) * 2009-07-28 2011-02-03 Canon Kabushiki Kaisha Managing apparatus, image forming apparatus, method of controlling the managing apparatus, and storage medium
US8480083B2 (en) * 2009-07-28 2013-07-09 Canon Kabushiki Kaisha Managing apparatus, image forming apparatus, method of controlling the managing apparatus, and storage medium
US10791233B2 (en) * 2019-01-25 2020-09-29 Kyocera Document Solutions Inc. Image forming apparatus capable of performing a print job to print an image on a sheet being conveyed
US20200264814A1 (en) * 2019-02-14 2020-08-20 Canon Kabushiki Kaisha Sheet feeding apparatus, information processing method, and non-transitory computer-readable storage medium
US11567705B2 (en) * 2019-02-14 2023-01-31 Canon Kabushiki Kaisha Sheet feeding apparatus, information processing method, and non-transitory computer-readable storage medium

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JP2007008654A (ja) 2007-01-18
JP4659532B2 (ja) 2011-03-30

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