EP0397199A2 - Sheet conveying apparatus - Google Patents
Sheet conveying apparatus Download PDFInfo
- Publication number
- EP0397199A2 EP0397199A2 EP90108924A EP90108924A EP0397199A2 EP 0397199 A2 EP0397199 A2 EP 0397199A2 EP 90108924 A EP90108924 A EP 90108924A EP 90108924 A EP90108924 A EP 90108924A EP 0397199 A2 EP0397199 A2 EP 0397199A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- sheets
- jam
- sheet
- conveyance path
- accommodating portion
- 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.)
- Ceased
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Classifications
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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
- G03G15/65—Apparatus which relate to the handling of copy material
- G03G15/6555—Handling of sheet copy material taking place in a specific part of the copy material feeding path
- G03G15/6579—Refeeding path for composite copying
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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
- G03G15/22—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20
- G03G15/23—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20 specially adapted for copying both sides of an original or for copying on both sides of a recording or image-receiving material
- G03G15/231—Arrangements for copying on both sides of a recording or image-receiving material
- G03G15/232—Arrangements for copying on both sides of a recording or image-receiving material using a single reusable electrographic recording member
- G03G15/234—Arrangements for copying on both sides of a recording or image-receiving material using a single reusable electrographic recording member by inverting and refeeding the image receiving material with an image on one face to the recording member to transfer a second image on its second face, e.g. by using a duplex tray; Details of duplex trays or inverters
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G2215/00—Apparatus for electrophotographic processes
- G03G2215/00362—Apparatus for electrophotographic processes relating to the copy medium handling
- G03G2215/00367—The feeding path segment where particular handling of the copy medium occurs, segments being adjacent and non-overlapping. Each segment is identified by the most downstream point in the segment, so that for instance the segment labelled "Fixing device" is referring to the path between the "Transfer device" and the "Fixing device"
- G03G2215/00417—Post-fixing device
- G03G2215/0043—Refeeding path
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G2215/00—Apparatus for electrophotographic processes
- G03G2215/00362—Apparatus for electrophotographic processes relating to the copy medium handling
- G03G2215/00367—The feeding path segment where particular handling of the copy medium occurs, segments being adjacent and non-overlapping. Each segment is identified by the most downstream point in the segment, so that for instance the segment labelled "Fixing device" is referring to the path between the "Transfer device" and the "Fixing device"
- G03G2215/00417—Post-fixing device
- G03G2215/0043—Refeeding path
- G03G2215/00434—Refeeding tray or cassette
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G2215/00—Apparatus for electrophotographic processes
- G03G2215/00362—Apparatus for electrophotographic processes relating to the copy medium handling
- G03G2215/00535—Stable handling of copy medium
- G03G2215/00548—Jam, error detection, e.g. double feeding
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G2215/00—Apparatus for electrophotographic processes
- G03G2215/00362—Apparatus for electrophotographic processes relating to the copy medium handling
- G03G2215/00535—Stable handling of copy medium
- G03G2215/00548—Jam, error detection, e.g. double feeding
- G03G2215/00552—Purge of recording medium at jam
Definitions
- the present invention relates to a sheet conveying apparatus for an electrophotographic copying machine, a printing press, a printer, an automatic document feeder (ADF) or the like, more specifically to a paper jam treatment technique.
- ADF automatic document feeder
- the operator's hands were soiled with unfixed toner when removing the jammed sheet between a photosensitive body of image forming portion and a fixing device.
- the present invention was conceived to overcome the above problem in the prior art, and the main object thereof is to provide a sheet conveying apparatus in which the sheets being conveyed on the conveyance path are gathered at a predetermined place, enabling the removal of sheets to be easily performed and prompt jam return.
- a sheet conveying apparatus has a jam detecting means by which the sheet conveyance is stopped in case of jam occurrence to carry out a jam treatment, in which there are provided an accommodating portion for jam treatment leading to aforementioned conveyance path, and a conveyance control means to accommodate the sheets being conveyed on the conveyance path into the accommodating portion for jam treatment when the jam detecting means senses a paper jamming.
- the present invention with above constitution enables all the sheets on the conveyance path to be gathered in the accommodating portion of jam treatment in case of paper jamming by putting away the same into the accommodating portion.
- a conveyance controlling portion which controls so as to accommodate the sheet being conveyed on the conveyance path into the accommodating portion for jam treatment, so that all the sheets can be removed in a lump with no need to remove the sheets resting on the different places of the conveyance path one by one as in the past, rendering the removal treatment (jam treatment) easier.
- the present invention was also conceived to overcome the second problem in the prior art mentioned above, and the object is to provide a sheet conveying apparatus in which the sheets being conveyed on the conveyance path are discharged into a predetermined place, thereby enabling easier removal of jammed and other enclosed sheets of copying paper and prompt jam return.
- a sheet conveying apparatus has a jam detecting means for sensing a paper jamming, thereby stopping conveying the sheet on the conveyance path in case of jam occurrence, wherein there are provided a standby accommodating portion for discharge which is arranged to accommodate the sheets being conveyed on the conveyance path when paper jamming is sensed with the aid of aforementioned jam detecting means, and a discharged means which rejects the sheets being put away in the standby accommodating portion for discharge.
- an image forming portion which carries out a predetermined image formation on aforesaid sheet, and an image forming controlling means which functions to perform the image formation on the sheets being put away in the standby accommodating portion for discharge.
- it is more effective to prohibit a further image forming which causes the disturbance of the image previously formed on the sheets.
- the second invention having the above constitution, all the sheets resting on the conveyance path are accommodated in the standby accommodating portion for discharge to be gathered in the predetermined place, making ready to be discharged outside the apparatus after jam return.
- an image forming portion to carry out the image formation onto the sheets to be put away in the standby accommodating portion for discharge, thereby preventing miss sheets from occurring. Furthermore, since image forming is prohibited during the rejection of sheets, the image previously formed on the sheets is not to be disturbed.
- the apparatus in case of jam occurrence, the sheets being conveyed on the conveyance path are temporarily accommodated in the standby accommodating portion for discharge and then rejected outside the apparatus after jam return.
- the apparatus has an advantage that there is no need to remove the sheets lying scattered on the conveyance path one by one as in the past, instead the sheets to be discharged can be removed collectively, thereby rendered the removal process or jam treatment easier, preventing the paper jam from occurring again due to the carelessly remaining jammed sheet, and shortening and downtime to be required for jam return.
- the sheet on the conveyance path can be discharged as a regular output sheet, thereby reducing the occurrence of miss sheets.
- Fig. 3 is a structural cross-sectional view showing a copying machine applying a sheet conveying apparatus according to one embodiment of the present invention.
- a copying machine body 100 is equipped with an image forming portion 101, a conveying portion 102 which defines a conveying path along the image forming portion 101 to convey sheets S (recording media), and reconveying means 200 possessing a both sides processing function by which sheets S are turned over to be recorded on both sides thereof, and a multiple recording function by which the same recording face can be recorded a plurality of times.
- the re-conveying means 200 opening into the conveying portion 102 has an intermediate tray 201 for accommodating the sheets which have passed the image forming portion 101, the intermediate tray serving as an accommodating portion for jam treatment according to the present invention.
- Reference numeral 300 designates a circulating document feeder (referred to as "ADF” hereinafter), numeral 400 denotes a sorting device for accommodating the sheets S which have already been recorded into a plurality of bin tray 401 (hereinafter referred to as "Sorter”), and numeral 500 represents a pedestal provided with a deck 501 for accommodating a great number of sheets S (for example, 200 sheets).
- ADF circulating document feeder
- Sorter a sorting device for accommodating the sheets S which have already been recorded into a plurality of bin tray 401
- numeral 500 represents a pedestal provided with a deck 501 for accommodating a great number of sheets S (for example, 200 sheets).
- These apparatus, the ADF 300, the sorter 400, and the pedestal 500 can be optionally combined with relation to the copying machine 100.
- the ADF 300 is mounted on the platen glass 103 of the copying machine and the sorter 100 is connected to an output side, down-stream of a discharging roller 105.
- Sheets S which is supplied through a deck 501, cassettes C1, C2, or a manual paper feed inlet C3, after adjusting the conveying timing by means of a regist roller 105, are conveyed along the image forming portion 101 with the aid of the conveyance portion 102.
- a toner image developed on the photosensitive drum 106 is transferred and fixed onto the sheets S by means of a fixing device 107.
- a flapper 108 is provided just downstream of the fixing device 107, whereby the conveyance path is alternatively led through the conveyance portion 102 either to the sorter 400 following the discharging roller 104 or to the intermediate tray 201 of the re-conveyance means 200.
- n-th sheet (shown by n in the figure) is jammed in the sorter 400.
- n-th sheet (shown by n in the figure) is jammed in the sorter 400.
- the bin tray 401 already output sheets from 1st to (n-1)th are accommodated, (n+1)th sheet resting at the fixing device 107 disposed in the upsteam of discharging roller 104, (n+2)th sheet being in contact with the photosensitive drum 106, and (n+3)th sheet being located in the position just after the deck 501.
- a document corresponding to the (n+2)th sheet is mounted on the platen glass 103, which is about to be replaced by the document corresponding to the (n+3)th sheet.
- Paper jamming in the sorter 400 is detected by means of photo-sensor 402 serving as a jam detecting means.
- a sorter jamming due to the n-th sheet stopped all conveyance of the copying machine 100, while in the present invention any sheets do not remain on the conveyance path as shown in Fig. 4.
- the flapper 108 is operated so as to lead the conveying portion 102 into the intermediate tray 201, thereby accommodating the sheets on and after (n+1)th into the intermediate tray.
- another flapper 202 is provided on the conveyance path which acts to selectively change over reverse or non-reverse mode for sheets corresponding to whether the image is formed on the opposite side or superimposed on the same side.
- non-reverse mode the sheets are directly guided to a discharge gate 203 and stacked up, with the image formed surface downward, through the discharge gate 203 corresponding to the sheet size.
- reverse mode the sheets are temporarily led to a reverse path (switch-back path) 204, guided to the discharge gate 203 with the trailing edge thereof ahead, and is accommodated to stack up with the image formed surface upward.
- the conveying operation in the copying machine 100 is not interrupted, so that (n+3)th sheet in the position just after feeding as shown in Fig. 3 could be conveyed into the accommodating portion, and accommodated in the intermediate tray 201 before long.
- Fig. 1 shows the block diagram of the copying machine adopting the sheet conveying apparatus according to one embodiment of the present invention, wherein the identical structures thereof to those shown in Figs. 3 and 4 are marked with identical signs to those in these figures.
- reference numeral 1 designates a controlling portion which controls entire operation of the copying machine.
- the controlling portion 1 controls the flapper 202, discharge gate 203 or the like in such a way that the sheets being conveyed and adapted to be accommodated into the intermediate tray 201 are caused to be accommodated therein after making sure that there are no sheets to prevent the movement of the flapper 108.
- the control portion 1 also controls the movement of several portions in accordance with the respective key commands of the operating portion 2 and permits the displaying portion 3 to indicate a message and the like according to the operating condition.
- the controlling portion 1 stands by for paper jamming which occurs in the sorter 400 etc. (Step 601), and stops immediately the operation of the sorter 400 while continuing the conveying operation in the machine (Step 602).
- the controlling portion 1 detects the sheets which makes the flapper 108 inoperative with the aid of the sensor 109 (Step 603), actuates the flapper 108 so as to accommodate the sheets being conveyed into the intermediate tray 201 when there are no sheets to be found (Step 604), actuates the flapper 202 according to the reverse/non-reverse mode of the sheets (Step 605), and leads the sheets on the conveyance path to the discharge gate 203.
- the discharge gate 203 is changed over in accordance with the sheet size (Step 606), and the sheets are accommodated in the intermediate tray 201 (Step 607).
- the controlling portion 1 confirms whether the sheets are present or not on the conveyance path by the signal of well-known jam detecting device (not shown in the figure) disposed at several points of the conveyance path, judges whether all the sheets on the conveyance path have been accommodated into the intermediate tray 201 (Step 608) and stops the conveying operation of the copying machine 100 when judged "YES" (Step 609) to complete the process.
- the signal of well-known jam detecting device not shown in the figure
- Step 6 when judged "NO" at Step 6, it instructs to jump to Step 609 therefrom, whereby the conveying operation of the copying machine 100 is stopped at once to complete the process. Moreover, the displaying portion 3 indicates appropriate display when paper jamming takes place.
- the sheets on the conveying path can be gathered into the intermediate tray 201 by incorporating the sheet conveying apparatus according to the present invention, for example, into a copying machine, so that all the sheet can be removed at one time, thereby eliminating the troublesome process of removing the sheet lying scattered at several places on the conveyance path one by one with close inspection.
- the use of existing intermediate tray 201 leads to space and cost efficiency compared to that of newly manufactured accommodating tray and ensures the reliability of the copying machine.
- soiling of operator's hands with the unfixed toner in the vicinity of the fixing apparatus re-occurrence of paper jamming due to carelessly remaining jammed sheet can be prevented, and down-time required for jam return is to be shortened.
- the sheets When the sheets are accommodated into the intermediate tray 201, they may be carried in either mode of reverse or non-reverse, and regardless of the method thereof.
- the sorter jam is typically shown, but the present invention is also effective against paper jamming at the discharge portion of the apparatus body (discharge roller 104) or ADF 300.
- discharge roller 1014 discharge roller 1014
- ADF 300 ADF 300
- the senor 108 is disposed just before the flapper 108 to judge whether to accommodate the sheets into the intermediate tray 201 or not.
- the sensor 109 is not necessarily indispensable means, instead a sensor (existing one available) located at the upstream of the flapper 108 and a standard pulse generating means may be used in combination, whereby the position of the sheets on the conveyance path could be detected to make the above judgement.
- a sheet conveying apparatus is applied to an electrophotographic copying machine based on optical information, otherwise this invention is applicable to a printer based on electronic information, a printing press, an ADF serving as a sheet conveying apparatus, or the like.
- the accommodating portion for jam treatment may be provided at several places as long as jam treatment is facilitated thereby.
- the sheets being accommodated in the intermediate tray 201 are discharged outside the apparatus as shown in Fig. 9.
- the sheets are again fed from the intermediate tray 201 into the conveying portion 102 by means of the paper feed roller 205.
- the conveying portion 102 opens into the sorter 400 through the flapper 108 and the sheets are discharged onto the other tray 403 than the bin tray 401 on which the sheets were ejected before as shown in the figures.
- the sheets may be discharged on the bin tray 401 where the sheets have already piled up.
- image forming can be normally carried out onto the sheets.
- the sheets are to be accommodated into the intermediate tray after image forming thereon as usual.
- white image no image
- image forming operation at the image forming portion 101 may be made inoperative, more specifically, a blank exposure may be entirely applied onto the photosensitive drum 106 in such a way that latent image is not to be formed regardless of the document to be mounted on the platen glass 103.
- the developing device 110 is not made to be actuated, or that the toner image is not made to be transferred onto the sheet by breaking the corona of a transfer electrifying device 111.
- the sheet on the conveyance path which was disposed of as a miss sheet in the past can be used as a regular output sheet.
- Fig. 5 designates a block diagram of the copying machine illustrated in Figs. 7 - 9 applying a sheet conveying apparatus according to the second embodiment of the present invention.
- the same numerals or signs denote identical members to those in Figs. 1 - 4 and Figs. 7 - 9.
- Reference numeral 1 represents a controlling portion which controls the entire operation of the copying machine, and which has an accommodation controlling means 1a, a discharge controlling means 1b, an image forming controlling means 1c and the like.
- the accommodation controlling portion 1a allows the sheets being conveyed on the conveyance path to be accommodated into the intermediate tray, when for example, the photo-sensor 402 detects a paper jamming.
- the discharge controlling portion 16 causes the re-conveying means 200 to re-supply the sheets being accommodated in the intermediate tray 201 into the conveying portion 102, and then causes the sorter 400 to discharge the sheets outside the apparatus, according to the jam clear signal which is input by pressing a jam reset switch 404.
- the image forming controlling portion 1c allows the image forming portion 101 to form a predetermined image onto the sheets, carries out the image forming onto the sheets which is accommodated in the standby accommodation portion for discharge, and prohibits newly image forming which disturbs the image which has been already formed on the sheets in case of sheet discharge.
- the controlling portion 1 controls the operations of several portions in accordance with the respective key commands of the operating portion 2, and allows the displaying portion 3 to show the message, etc., according to the state of operation.
- the controlling portion 1 stands by for a paper jamming which takes place in the sorter 400 etc. (Step 601), and stops the operation of the sorter 400 immediately while proceeding with the conveyance in the machine and the image forming in case of a sorter jam (Step 602).
- the accommodation controlling portion 1a detects, if any, the sheets which will bring about an inoperativeness of the flapper 108 by means of the sensor 109 (Step 603), actuates the flapper 108 to accommodate the sheets being conveyed into the intermediate tray 201 when there is no sheets to be found (Step 604), actuates the flapper 202 according to the reverse/non-reverse mode for the sheets (Step 605), and guides the sheets on the conveyance path to the discharge gate 203.
- the discharge gate 203 is changed over according to the sheet size (Step 606), and allows the intermediate tray 201 to accommodate the sheets (Step 607).
- the accommodation controlling portion 1a confirms the presence or absence of the sheets on the conveyance path with the aid of the signal of such as jam detecting device (not shown) which was disposed at several places on the conveyance path in the prior art, judges whether all the sheets on the conveyance path have been accommodated into the intermediate tray 201 (Step 608), and stands by for jam return when judged "YES" (Step 609).
- jam detecting device not shown
- the discharge controlling portion 16 initiates discharge of the accommodated sheets (Step 610), judges whether all the accommodated sheets have been discharged (Step 611), and stops the conveying operation of the copying machine 100 when judged "YES" (Step 612), to complete the process. In the course of above steps 610 - 612, there is prohibited an image formation onto the sheets.
- Step 603 the process jumps to Step 612 where the conveying operation of the copying machine 100 and the image formation are stopped at once to complete the process. Upon occurring of jam, the displaying portion 3 indicates a proper display.
- the sheets which have been temporarily accommodated into the intermediate tray 201 is discharged into one bin tray of the sorter 400, so that it is unnecessary to remove the sheets lying scattered on the conveyance path one by one with careful inspection.
- the sheet conveying apparatus By incorporating the sheet conveying apparatus into an image forming apparatus such as a copying machine, a regular image can be formed onto the sheets to be disposed of, thereby reducing the number of miss sheets. Furthermore an existing intermediate tray is utilized so that space and cost efficiency can be procured compared to a newly provided accommodation tray, resulting in maintaining reliance of the copying machine.
- a sheet conveying apparatus having a jam detecting means, there are provided an accommodating portion for jam treatment and a conveyance controlling means to accommodate sheets on a conveyance path into said portion, enabling all the sheets on the path to be gathered in one place and rendering the removal treatment easier.
- the sheets being conveyed are temporarily accommodated in the standby accommodating portion for discharge and then rejected outside the apparatus after jam return, while an image forming portion carrying out the image formation onto the sheets to be accommodated so that they can be discharged as regular output sheets, and image formation being prohibited when the sheets are discharged, resulting in that the image previously formed on the sheets is not to be disturbed.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Controlling Sheets Or Webs (AREA)
- Separation, Sorting, Adjustment, Or Bending Of Sheets To Be Conveyed (AREA)
- Paper Feeding For Electrophotography (AREA)
Abstract
Description
- The present invention relates to a sheet conveying apparatus for an electrophotographic copying machine, a printing press, a printer, an automatic document feeder (ADF) or the like, more specifically to a paper jam treatment technique.
- In the past, it was the most efficient measures for a paper jamming treatment incidental to the sheet conveyance in this kind of sheet conveying device for such as an electrophotographic copying machine and a printer that the subsequent sheet was not allowed to be conveyed before a sheet of copying paper had been completely ejected from the apparatus so that the treatment could be completed if only the jammed sheet was removed. Such paper conveying system was applicable to a low-speed small sized machine, but not suitable for a high-speed large sized machine. An improved sheet conveying apparatus was therefore employed in which the interval of sheet conveyance was set as short as possible to in order to speed up with regard to the high-speed large sized machine. Such sheet conveying apparatus could be, for example, utilized for image forming apparatus to obtain a high-productivity per hour.
- On the other hand, due to development of multi-function such as color copy and multiple copy, the distance of sheet conveyance was liable to be elongated with the result that the number of sheets resting on the conveyance path was increased in the above-mentioned image forming apparatus.
- There has been also proposed a sheet conveying apparatus which was adapted for the automatization of collation or finishing process by connecting an output sheet processing apparatus such as a sorter or a finisher therewith as well as aforementioned development of speed-up and multi-function.
- However, in the prior art described above, the entire conveying operation of sheet conveying apparatus including output sheet processing apparatus stopped immediately after paper jamming occurs in, for example, the output sheet processing apparatus. As a result, the sheets being conveyed remained on the conveyance path, so that an operator had to remove the remaining sheets as well as the jammed sheet in the output sheet processing apparatus by inspecting the respective portions of the conveyance path, resulting in a poor jamming treatment.
- Specifically in the electrophotographic copying machine, the operator's hands were soiled with unfixed toner when removing the jammed sheet between a photosensitive body of image forming portion and a fixing device.
- Furthermore, as the sheet supplying portion tended to have a further complicated and elongated path for sheet conveyance, there were more points to be inspected for remaining sheets. Accordingly the inspection and removal of the jammed paper was a time-consuming, and a lot of time was required for jam return, in other words, normalization of the apparatus.
- Moreover, some sheet conveyance apparatus in the use of an electrophotographic copying machine, etc., functioned to automatically eject the sheets on the conveyance path from the apparatus without removing the sheets on the path one by one providing jammed sheet was treated (referred to as autoclear function). However, the sheet which was stopped on the pass in the middle of image forming caused to have a defective image, thereby being discharged as a mere miss sheet. In consequence, there was a drawback that aforesaid miss sheets and normal sheets were mingled to disorder pages of the sheets.
- The present invention was conceived to overcome the above problem in the prior art, and the main object thereof is to provide a sheet conveying apparatus in which the sheets being conveyed on the conveyance path are gathered at a predetermined place, enabling the removal of sheets to be easily performed and prompt jam return.
- In order to achieve the above object a sheet conveying apparatus according to the present invention has a jam detecting means by which the sheet conveyance is stopped in case of jam occurrence to carry out a jam treatment, in which there are provided an accommodating portion for jam treatment leading to aforementioned conveyance path, and a conveyance control means to accommodate the sheets being conveyed on the conveyance path into the accommodating portion for jam treatment when the jam detecting means senses a paper jamming.
- The present invention with above constitution enables all the sheets on the conveyance path to be gathered in the accommodating portion of jam treatment in case of paper jamming by putting away the same into the accommodating portion.
- According to the present invention, there is also provided a conveyance controlling portion which controls so as to accommodate the sheet being conveyed on the conveyance path into the accommodating portion for jam treatment, so that all the sheets can be removed in a lump with no need to remove the sheets resting on the different places of the conveyance path one by one as in the past, rendering the removal treatment (jam treatment) easier.
- Moreover, the present invention was also conceived to overcome the second problem in the prior art mentioned above, and the object is to provide a sheet conveying apparatus in which the sheets being conveyed on the conveyance path are discharged into a predetermined place, thereby enabling easier removal of jammed and other enclosed sheets of copying paper and prompt jam return.
- It is still further object of the present invention to provide a sheet conveying apparatus in which the occurrence of miss sheets can be reduced while predetermined image formation is carried out onto the sheets being conveyed.
- In order to achieve the objects mentioned above, a sheet conveying apparatus has a jam detecting means for sensing a paper jamming, thereby stopping conveying the sheet on the conveyance path in case of jam occurrence, wherein there are provided a standby accommodating portion for discharge which is arranged to accommodate the sheets being conveyed on the conveyance path when paper jamming is sensed with the aid of aforementioned jam detecting means, and a discharged means which rejects the sheets being put away in the standby accommodating portion for discharge. There are also provided an image forming portion which carries out a predetermined image formation on aforesaid sheet, and an image forming controlling means which functions to perform the image formation on the sheets being put away in the standby accommodating portion for discharge. In addition, it is more effective to prohibit a further image forming which causes the disturbance of the image previously formed on the sheets.
- According to the second invention having the above constitution, all the sheets resting on the conveyance path are accommodated in the standby accommodating portion for discharge to be gathered in the predetermined place, making ready to be discharged outside the apparatus after jam return. There is also provided an image forming portion to carry out the image formation onto the sheets to be put away in the standby accommodating portion for discharge, thereby preventing miss sheets from occurring. Furthermore, since image forming is prohibited during the rejection of sheets, the image previously formed on the sheets is not to be disturbed.
- According to the present invention, in case of jam occurrence, the sheets being conveyed on the conveyance path are temporarily accommodated in the standby accommodating portion for discharge and then rejected outside the apparatus after jam return. As a result, the apparatus has an advantage that there is no need to remove the sheets lying scattered on the conveyance path one by one as in the past, instead the sheets to be discharged can be removed collectively, thereby rendered the removal process or jam treatment easier, preventing the paper jam from occurring again due to the carelessly remaining jammed sheet, and shortening and downtime to be required for jam return.
- Because of the image forming portion which is provided to carry out the image formation onto aforesaid sheets to be accommodated, the sheet on the conveyance path can be discharged as a regular output sheet, thereby reducing the occurrence of miss sheets.
- In addition, image formation is prohibited when the sheets are discharged, so that the image previously formed on the sheets is not to be disturbed, leading to the maintenance of the quality of image on the sheets.
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- Fig. 1 is a block diagram of a copying machine incorporating a sheet conveying apparatus according to one embodiment of the present invention.
- Fig. 2 is a flow chart showing a jam treatment controlling procedure according to the present invention;
- Fig. 3 is a structural cross-sectional view of a copying machine adopting a sheet conveying apparatus according to one embodiment of the present invention;
- Fig. 4 is a structural cross-sectional view showing the movement of the copying machine illustrated in Fig. 3 in case of jam occurrence;
- Fig. 5 is a block diagram of a copying machine applying a sheet conveying apparatus according to the second embodiment of the present invention;
- Fig. 6 is a flow chart showing a jam treatment controlling procedure according to the second embodiment of the present invention;
- Fig. 7 is a structural cross-sectional view of the copying machine incorporating a sheet conveying apparatus according to the second embodiment of the present invention;
- Fig. 8 is a structural cross-sectional view showing the movement of the sheet accommodation in case of jam occurrence of the copying machine illustrated in Fig. 7; and
- Fig. 9 is a structural cross-sectional view showing the movement of sheet discharge after jam return of the copying machine illustrated in Fig. 7.
- The present invention will hereinafter be described in detail with reference to the accompanying drawings.
- Fig. 3 is a structural cross-sectional view showing a copying machine applying a sheet conveying apparatus according to one embodiment of the present invention.
- In the figure, a
copying machine body 100 is equipped with animage forming portion 101, a conveyingportion 102 which defines a conveying path along theimage forming portion 101 to convey sheets S (recording media), and reconveying means 200 possessing a both sides processing function by which sheets S are turned over to be recorded on both sides thereof, and a multiple recording function by which the same recording face can be recorded a plurality of times. The re-conveying means 200 opening into theconveying portion 102 has anintermediate tray 201 for accommodating the sheets which have passed theimage forming portion 101, the intermediate tray serving as an accommodating portion for jam treatment according to the present invention.Reference numeral 300 designates a circulating document feeder (referred to as "ADF" hereinafter),numeral 400 denotes a sorting device for accommodating the sheets S which have already been recorded into a plurality of bin tray 401 (hereinafter referred to as "Sorter"), andnumeral 500 represents a pedestal provided with adeck 501 for accommodating a great number of sheets S (for example, 200 sheets). These apparatus, the ADF 300, thesorter 400, and thepedestal 500 can be optionally combined with relation to thecopying machine 100. The ADF 300 is mounted on theplaten glass 103 of the copying machine and thesorter 100 is connected to an output side, down-stream of adischarging roller 105. Sheets S which is supplied through adeck 501, cassettes C₁, C₂, or a manual paper feed inlet C₃, after adjusting the conveying timing by means of aregist roller 105, are conveyed along theimage forming portion 101 with the aid of theconveyance portion 102. By using a well-known electrophotographic process, a toner image developed on thephotosensitive drum 106 is transferred and fixed onto the sheets S by means of afixing device 107. Aflapper 108 is provided just downstream of thefixing device 107, whereby the conveyance path is alternatively led through theconveyance portion 102 either to thesorter 400 following thedischarging roller 104 or to theintermediate tray 201 of the re-conveyance means 200. Now during image forming in continuous copying operation, suppose that n-th sheet (shown by n in the figure) is jammed in thesorter 400. At this time, e.g., in thebin tray 401 already output sheets from 1st to (n-1)th are accommodated, (n+1)th sheet resting at thefixing device 107 disposed in the upsteam ofdischarging roller 104, (n+2)th sheet being in contact with thephotosensitive drum 106, and (n+3)th sheet being located in the position just after thedeck 501. A document corresponding to the (n+2)th sheet is mounted on theplaten glass 103, which is about to be replaced by the document corresponding to the (n+3)th sheet. Paper jamming in thesorter 400 is detected by means of photo-sensor 402 serving as a jam detecting means. - In the prior art, a sorter jamming due to the n-th sheet stopped all conveyance of the
copying machine 100, while in the present invention any sheets do not remain on the conveyance path as shown in Fig. 4. Adjacent to the 108 there is provided asensor 109 by which the presence or absence of sheet can be detected. Providing that any sheets preventing the movement of theflapper 108 is not present, and therefore sheets on the conveyance path can be accommodated into theintermediate tray 201, theflapper 108 is operated so as to lead theconveying portion 102 into theintermediate tray 201, thereby accommodating the sheets on and after (n+1)th into the intermediate tray. On the way to theintermediate tray 201, anotherflapper 202 is provided on the conveyance path which acts to selectively change over reverse or non-reverse mode for sheets corresponding to whether the image is formed on the opposite side or superimposed on the same side. - In non-reverse mode, the sheets are directly guided to a
discharge gate 203 and stacked up, with the image formed surface downward, through thedischarge gate 203 corresponding to the sheet size. In reverse mode, the sheets are temporarily led to a reverse path (switch-back path) 204, guided to thedischarge gate 203 with the trailing edge thereof ahead, and is accommodated to stack up with the image formed surface upward. In case of jam occurrence, the conveying operation in the copyingmachine 100 is not interrupted, so that (n+3)th sheet in the position just after feeding as shown in Fig. 3 could be conveyed into the accommodating portion, and accommodated in theintermediate tray 201 before long. - Fig. 1 shows the block diagram of the copying machine adopting the sheet conveying apparatus according to one embodiment of the present invention, wherein the identical structures thereof to those shown in Figs. 3 and 4 are marked with identical signs to those in these figures. In Fig. 1,
reference numeral 1 designates a controlling portion which controls entire operation of the copying machine. In case paper jamming takes place in thesorter 400 and the jam signal is inputted with the aid of the photo-sensor 402, the controllingportion 1 controls theflapper 202,discharge gate 203 or the like in such a way that the sheets being conveyed and adapted to be accommodated into theintermediate tray 201 are caused to be accommodated therein after making sure that there are no sheets to prevent the movement of theflapper 108. Thecontrol portion 1 also controls the movement of several portions in accordance with the respective key commands of the operatingportion 2 and permits the displayingportion 3 to indicate a message and the like according to the operating condition. - A control procedure for jam treatment in the
control portion 1 illustrated in Fig. 1 will now be described in accordance with the flow chart shown in Fig. 2. - In the first place, the controlling
portion 1 stands by for paper jamming which occurs in thesorter 400 etc. (Step 601), and stops immediately the operation of thesorter 400 while continuing the conveying operation in the machine (Step 602). - In the second place, the controlling
portion 1 detects the sheets which makes theflapper 108 inoperative with the aid of the sensor 109 (Step 603), actuates theflapper 108 so as to accommodate the sheets being conveyed into theintermediate tray 201 when there are no sheets to be found (Step 604), actuates theflapper 202 according to the reverse/non-reverse mode of the sheets (Step 605), and leads the sheets on the conveyance path to thedischarge gate 203. Thedischarge gate 203 is changed over in accordance with the sheet size (Step 606), and the sheets are accommodated in the intermediate tray 201 (Step 607). - Afterward, the controlling
portion 1 confirms whether the sheets are present or not on the conveyance path by the signal of well-known jam detecting device (not shown in the figure) disposed at several points of the conveyance path, judges whether all the sheets on the conveyance path have been accommodated into the intermediate tray 201 (Step 608) and stops the conveying operation of the copyingmachine 100 when judged "YES" (Step 609) to complete the process. - On the other hand, when judged "NO" at Step 6, it instructs to jump to Step 609 therefrom, whereby the conveying operation of the copying
machine 100 is stopped at once to complete the process. Moreover, the displayingportion 3 indicates appropriate display when paper jamming takes place. - As discribed above, the sheets on the conveying path can be gathered into the
intermediate tray 201 by incorporating the sheet conveying apparatus according to the present invention, for example, into a copying machine, so that all the sheet can be removed at one time, thereby eliminating the troublesome process of removing the sheet lying scattered at several places on the conveyance path one by one with close inspection. Furthermore, the use of existingintermediate tray 201 leads to space and cost efficiency compared to that of newly manufactured accommodating tray and ensures the reliability of the copying machine. As well as soiling of operator's hands with the unfixed toner in the vicinity of the fixing apparatus, re-occurrence of paper jamming due to carelessly remaining jammed sheet can be prevented, and down-time required for jam return is to be shortened. - When the sheets are accommodated into the
intermediate tray 201, they may be carried in either mode of reverse or non-reverse, and regardless of the method thereof. - In the above embodiment, the sorter jam is typically shown, but the present invention is also effective against paper jamming at the discharge portion of the apparatus body (discharge roller 104) or
ADF 300. In this case, it is necessary that the conveyance path leading to theintermediate tray 201 is maintained operative, while stopping only the operation of the discharge portion orADF 300 being subjected to paper jamming. - In the above description, the
sensor 108 is disposed just before theflapper 108 to judge whether to accommodate the sheets into theintermediate tray 201 or not. However thesensor 109 is not necessarily indispensable means, instead a sensor (existing one available) located at the upstream of theflapper 108 and a standard pulse generating means may be used in combination, whereby the position of the sheets on the conveyance path could be detected to make the above judgement. - In the above embodiment, a sheet conveying apparatus is applied to an electrophotographic copying machine based on optical information, otherwise this invention is applicable to a printer based on electronic information, a printing press, an ADF serving as a sheet conveying apparatus, or the like. In addition, the accommodating portion for jam treatment may be provided at several places as long as jam treatment is facilitated thereby.
- Next the second embodiment of the present invention will be described in detail with reference to the accompanying drawings, Figs. 5 to 9. In this embodiment, the sheets being put away in the standby accommodating portion for discharge is to be ejected outside the apparatus after jam treatment. Accordingly, the description of the same operations as those in the first embodiment will be omitted, and the procedure after jam treatment will be described in detail.
- When the jammed sheet n is taken off and proper jam treatment is conducted, the sheets being accommodated in the
intermediate tray 201 are discharged outside the apparatus as shown in Fig. 9. The sheets are again fed from theintermediate tray 201 into the conveyingportion 102 by means of thepaper feed roller 205. In order to know the completion of re-feed, one may previously count the number of sheets being accommodated in the intermediate tray by means of a memory, etc., or may provide a sensor in theintermediate tray 201, thereby detecting the running out of re-feed sheets. The conveyingportion 102 opens into thesorter 400 through theflapper 108 and the sheets are discharged onto theother tray 403 than thebin tray 401 on which the sheets were ejected before as shown in the figures. The sheets may be discharged on thebin tray 401 where the sheets have already piled up. - Furthermore, when the sheets on the conveyance path are accommodated into the intermediate tray due to jamming in the sorter as shown in Fig. 8, image forming can be normally carried out onto the sheets. In other words, the sheets are to be accommodated into the intermediate tray after image forming thereon as usual. In this case, when the sheets are subsequently discharged, it is desirable that white image (no image) be overlaid to be multiple images in order not to disturb the image which has already been formed on the sheet. In order to procure a similar effect, image forming operation at the
image forming portion 101 may be made inoperative, more specifically, a blank exposure may be entirely applied onto thephotosensitive drum 106 in such a way that latent image is not to be formed regardless of the document to be mounted on theplaten glass 103. It may be otherwise conceived that the developingdevice 110 is not made to be actuated, or that the toner image is not made to be transferred onto the sheet by breaking the corona of a transfer electrifying device 111. With above constitution, the sheet on the conveyance path which was disposed of as a miss sheet in the past, can be used as a regular output sheet. - Fig. 5 designates a block diagram of the copying machine illustrated in Figs. 7 - 9 applying a sheet conveying apparatus according to the second embodiment of the present invention. In the figure, the same numerals or signs denote identical members to those in Figs. 1 - 4 and Figs. 7 - 9.
-
Reference numeral 1 represents a controlling portion which controls the entire operation of the copying machine, and which has an accommodation controlling means 1a, a discharge controlling means 1b, an image forming controlling means 1c and the like. The accommodation controlling portion 1a allows the sheets being conveyed on the conveyance path to be accommodated into the intermediate tray, when for example, the photo-sensor 402 detects a paper jamming. After completing jam treatment, the discharge controlling portion 16 causes the re-conveying means 200 to re-supply the sheets being accommodated in theintermediate tray 201 into the conveyingportion 102, and then causes thesorter 400 to discharge the sheets outside the apparatus, according to the jam clear signal which is input by pressing a jamreset switch 404. The image formingcontrolling portion 1c allows theimage forming portion 101 to form a predetermined image onto the sheets, carries out the image forming onto the sheets which is accommodated in the standby accommodation portion for discharge, and prohibits newly image forming which disturbs the image which has been already formed on the sheets in case of sheet discharge. The controllingportion 1 controls the operations of several portions in accordance with the respective key commands of the operatingportion 2, and allows the displayingportion 3 to show the message, etc., according to the state of operation. - A jam treatment controlling procedure in the controlling portion illustrated in Fig. 5 will be hereinafter described in accordance with Fig. 6.
- In the first place, the controlling
portion 1 stands by for a paper jamming which takes place in thesorter 400 etc. (Step 601), and stops the operation of thesorter 400 immediately while proceeding with the conveyance in the machine and the image forming in case of a sorter jam (Step 602). - In the second place, the accommodation controlling portion 1a detects, if any, the sheets which will bring about an inoperativeness of the
flapper 108 by means of the sensor 109 (Step 603), actuates theflapper 108 to accommodate the sheets being conveyed into theintermediate tray 201 when there is no sheets to be found (Step 604), actuates theflapper 202 according to the reverse/non-reverse mode for the sheets (Step 605), and guides the sheets on the conveyance path to thedischarge gate 203. Thedischarge gate 203 is changed over according to the sheet size (Step 606), and allows theintermediate tray 201 to accommodate the sheets (Step 607). - In the following steps, the accommodation controlling portion 1a confirms the presence or absence of the sheets on the conveyance path with the aid of the signal of such as jam detecting device (not shown) which was disposed at several places on the conveyance path in the prior art, judges whether all the sheets on the conveyance path have been accommodated into the intermediate tray 201 (Step 608), and stands by for jam return when judged "YES" (Step 609).
- Afterward, when jam is cleared and jam cleared signal is input, the discharge controlling portion 16 initiates discharge of the accommodated sheets (Step 610), judges whether all the accommodated sheets have been discharged (Step 611), and stops the conveying operation of the copying
machine 100 when judged "YES" (Step 612), to complete the process. In the course of above steps 610 - 612, there is prohibited an image formation onto the sheets. - On the other hand, when judged "NO" at
Step 603, the process jumps to Step 612 where the conveying operation of the copyingmachine 100 and the image formation are stopped at once to complete the process. Upon occurring of jam, the displayingportion 3 indicates a proper display. - As described above, the sheets which have been temporarily accommodated into the
intermediate tray 201 is discharged into one bin tray of thesorter 400, so that it is unnecessary to remove the sheets lying scattered on the conveyance path one by one with careful inspection. - By incorporating the sheet conveying apparatus into an image forming apparatus such as a copying machine, a regular image can be formed onto the sheets to be disposed of, thereby reducing the number of miss sheets. Furthermore an existing intermediate tray is utilized so that space and cost efficiency can be procured compared to a newly provided accommodation tray, resulting in maintaining reliance of the copying machine.
- In a sheet conveying apparatus having a jam detecting means, there are provided an accommodating portion for jam treatment and a conveyance controlling means to accommodate sheets on a conveyance path into said portion, enabling all the sheets on the path to be gathered in one place and rendering the removal treatment easier. In another aspect of this invention, in case of jam occurrence, the sheets being conveyed are temporarily accommodated in the standby accommodating portion for discharge and then rejected outside the apparatus after jam return, while an image forming portion carrying out the image formation onto the sheets to be accommodated so that they can be discharged as regular output sheets, and image formation being prohibited when the sheets are discharged, resulting in that the image previously formed on the sheets is not to be disturbed.
Claims (10)
an accommodating portion for jam treatment communicating with said conveyance path; and
a conveyance controlling means which allows said sheets being conveyed on said conveyance path to be accommodated into said accommodating portion for jam treatment, when said sheet jam is sensed by said jam detecting means.
an accommodating portion for jam treatment communicating with said conveyance path; and
a conveyance controlling means which allows said sheets being conveyed on said conveyance path to be accommodated into said accommodating portion for jam treatment when said sheet jam is sensed by said jam detecting means.
a standby accommodating portion for discharge which accommodates said sheets being conveyed on said conveyance path when said sheet jam is sensed by said jam detecting means; and
a discharge means which discharges said sheets being accommodated in said standby accommodating portion for discharge outside the apparatus after completion of jam treatment.
a standby accommodating portion for discharge which accommodates said sheets being conveyed on said conveyance path when said sheet jam is sensed by said jam detecting means; and
a discharge means which discharges said sheets being accommodated in said standby accommodating portion for discharge outside the apparatus after completion of jam treatment.
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP117458/89 | 1989-05-12 | ||
JP11745889A JPH02300047A (en) | 1989-05-12 | 1989-05-12 | Sheet conveying device |
JP117457/89 | 1989-05-12 | ||
JP11745789A JPH02300046A (en) | 1989-05-12 | 1989-05-12 | Sheet conveying device |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0397199A2 true EP0397199A2 (en) | 1990-11-14 |
EP0397199A3 EP0397199A3 (en) | 1991-05-02 |
Family
ID=26455564
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19900108924 Ceased EP0397199A3 (en) | 1989-05-12 | 1990-05-11 | Sheet conveying apparatus |
Country Status (1)
Country | Link |
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EP (1) | EP0397199A3 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1389536A2 (en) | 2002-08-16 | 2004-02-18 | Oki Data Corporation | Printing method of printer apparatus |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
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US4474454A (en) * | 1981-08-20 | 1984-10-02 | Minolta Camera Kabushiki Kaisha | Paper monitoring device for a copying machine |
JPS60214374A (en) * | 1984-04-10 | 1985-10-26 | Fuji Xerox Co Ltd | Copying machine for both-surface copy |
JPS61231568A (en) * | 1985-04-05 | 1986-10-15 | Canon Inc | Both-surface image forming device |
JPS63176246A (en) * | 1987-01-13 | 1988-07-20 | Minolta Camera Co Ltd | Image creating device |
-
1990
- 1990-05-11 EP EP19900108924 patent/EP0397199A3/en not_active Ceased
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4474454A (en) * | 1981-08-20 | 1984-10-02 | Minolta Camera Kabushiki Kaisha | Paper monitoring device for a copying machine |
JPS60214374A (en) * | 1984-04-10 | 1985-10-26 | Fuji Xerox Co Ltd | Copying machine for both-surface copy |
JPS61231568A (en) * | 1985-04-05 | 1986-10-15 | Canon Inc | Both-surface image forming device |
JPS63176246A (en) * | 1987-01-13 | 1988-07-20 | Minolta Camera Co Ltd | Image creating device |
Non-Patent Citations (4)
Title |
---|
IBM TECHNICAL DISCLOSURE BULLETIN. vol. 23, no. 7a, December 1980, NEW YORK US page 2694 R.C. Brannan et al.: "SAVING COPIES AFTER MISFEED" * |
PATENT ABSTRACTS OF JAPAN vol. 10, no. 76 (P-440)(2133) 26 March 1986, & JP-A-60 214374 (FUJI XEROX K.K.) 26 October 1985, * |
PATENT ABSTRACTS OF JAPAN vol. 11, no. 68 (P-553)(2515) 28 February 1987, & JP-A-61 231568 (CANON K.K.) 15 October 1986, * |
PATENT ABSTRACTS OF JAPAN vol. 12, no. 445 (M-767)(3292) 22 November 1988, & JP-A-63 176246 (MINOLTA CAMERA K.K.) 20 July 1988, * |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1389536A2 (en) | 2002-08-16 | 2004-02-18 | Oki Data Corporation | Printing method of printer apparatus |
EP1389536A3 (en) * | 2002-08-16 | 2004-04-14 | Oki Data Corporation | Printing method of printer apparatus |
US7018120B2 (en) | 2002-08-16 | 2006-03-28 | Oki Data Corporation | Printing method of printer apparatus |
Also Published As
Publication number | Publication date |
---|---|
EP0397199A3 (en) | 1991-05-02 |
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