CN112506013B - Image forming apparatus with a toner supply device - Google Patents
Image forming apparatus with a toner supply device Download PDFInfo
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- CN112506013B CN112506013B CN201910871302.9A CN201910871302A CN112506013B CN 112506013 B CN112506013 B CN 112506013B CN 201910871302 A CN201910871302 A CN 201910871302A CN 112506013 B CN112506013 B CN 112506013B
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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
- G03G15/6529—Transporting
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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
- G03G15/20—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat
- G03G15/2003—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat
- G03G15/2014—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat using contact heat
- G03G15/2017—Structural details of the fixing unit in general, e.g. cooling means, heat shielding means
- G03G15/2028—Structural details of the fixing unit in general, e.g. cooling means, heat shielding means with means for handling the copy material in the fixing nip, e.g. introduction guides, stripping means
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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
- G03G15/657—Feeding path after the transfer point and up to the fixing point, e.g. guides and feeding means for handling copy material carrying an unfused toner image
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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
- G03G15/6573—Feeding path after the fixing point and up to the discharge tray or the finisher, e.g. special treatment of copy material to compensate for effects from the fixing
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Paper Feeding For Electrophotography (AREA)
- Control Or Security For Electrophotography (AREA)
Abstract
The invention relates to an image forming apparatus, wherein, the image forming apparatus has a paper conveying system, there are paper feed unit, first conveying roller pair, image forming unit including photosensitive body, fixing unit including fixing roller pair, first paper discharging unit including second conveying roller pair and paper jam judgement unit sequentially on the first conveying route of the paper conveying system; the image forming apparatus further has a first detection unit that detects presence or absence of paper at the fixing unit; a second detection unit that detects presence or absence of paper at the image forming unit; when the first detection unit detects that there is no paper in the fixing unit of the first conveyance path and the second detection unit detects that there is no paper in the image forming unit, the first conveyance roller pair rotates in the reverse direction to convey the paper in the reverse direction, and the second conveyance roller pair rotates in the forward direction to discharge the paper. Thus, the operation of the first conveying roller pair and the second conveying roller pair can be adjusted to classify the jammed paper, which contributes to reducing the waste of paper.
Description
Technical Field
The present invention relates to an image forming apparatus, and more particularly, to an image forming apparatus capable of performing a sorting process on a jammed sheet by adjusting operations of a first conveying roller pair and a second conveying roller pair.
Background
In a conventional image forming apparatus, the image forming apparatus includes a sheet transport system, and a sheet feeding unit, a first transport roller pair, an image forming unit including a photosensitive member, a fixing unit, a second transport roller pair, a first sheet discharging unit, and a jam detecting unit are sequentially provided in a first transport path of the sheet transport system. When the jam determination unit determines that a jam has occurred, the first conveying roller pair and the second conveying roller pair stop rotating, and the user checks the photosensitive member and the fixing unit. If there is a jammed sheet at the photoreceptor or the fixing unit, the user manually draws out the jammed sheet. Then, the first conveying roller pair and the second conveying roller pair rotate in the forward direction, the remaining sheets on the first conveying path are conveyed to the first sheet discharge unit, and the sheets are disposed of as used sheets. However, some of the sheets are still unused blank sheets, and are disposed of as waste sheets, which results in wasted sheets.
Disclosure of Invention
The present invention has been made to solve the above problems, and an object thereof is to provide an image forming apparatus capable of performing a sorting process on jammed sheets.
In order to solve the above problems, the present invention provides an image forming apparatus including: a sheet transport system in which a sheet feeding unit, a first transport roller pair, an image forming unit including a photosensitive body, a fixing unit including a fixing roller pair, a first sheet discharging unit including a second transport roller pair, and a jam detecting unit are provided in this order on a first transport path, the image forming apparatus being characterized by further comprising: a first detection unit that detects presence or absence of paper at a fixing unit of a first conveyance path when the jam determination unit determines a jam; a second detection unit that detects the presence or absence of paper at the image forming unit including the photoconductor of the first conveyance path; when the first detection unit detects that there is no paper at the fixing unit of the first conveyance path and the second detection unit detects that there is no paper at the image forming unit including the photosensitive body of the first conveyance path, the first conveyance roller pair rotates in the reverse direction to convey the paper in the reverse direction, and the second conveyance roller pair rotates in the forward direction to discharge the paper.
The present inventors have intensively studied to find that whether or not a sheet is still an image-fixed sheet has a large relationship with the position of the sheet on the first conveyance path when a jam occurs. Specifically, there is a large relationship with the relative position of the sheet and the fixing unit of the first conveyance path. If the paper is positioned at the upstream of the fixing unit, the paper is still unfixed, and can be reused after toner is removed; if the sheet is downstream of the fixing unit, the image fixed on the sheet can be directly discharged. When the first detection unit detects that there is no paper at the fixing unit of the first conveyance path, the first conveyance roller pair rotates in the reverse direction to convey the paper, on which the toner image is not transferred, in the reverse direction, and to convey the blank paper on the first conveyance path in the reverse direction. Correspondingly, the second conveying roller pair continues to convey and discharge paper so as to convey the paper printed with characters or patterns to the first paper discharge unit.
When the first detection unit detects that there is no paper in the fixing unit of the first conveyance path, the first conveyance roller pair rotates in the reverse direction to convey the paper without toner image transfer in the reverse direction, and the second conveyance roller pair continues conveyance and paper discharge, so that blank paper can be separated from paper on which characters or patterns are printed, and the blank paper can be reused, which contributes to reducing paper waste.
In addition, when the first detection unit detects that there is no paper in the fixing unit of the first conveyance path, the image forming apparatus automatically processes the jammed paper by adjusting the turning directions of the first conveyance roller pair and the second conveyance roller pair, which is advantageous for reducing the workload of the user and improving the work efficiency.
In the image forming apparatus, the image forming unit rotates the toner image formed on the photoreceptor so as to overlap and transfer the toner image onto the paper sheet by the photoreceptor, and when the first detecting unit detects that there is no paper in the fixing unit of the first conveyance path and the second detecting unit detects that there is paper in the image forming unit including the photoreceptor of the first conveyance path, the image forming unit conveys the paper sheet in the reverse direction by rotating the photoreceptor in the reverse direction, transfers the unfixed toner on the paper sheet onto the photoreceptor, and retracts the paper sheet.
Thus, the blank paper positioned at the photoreceptor of the first conveying path can be returned, and on the one hand, the paper jam problem of the image forming device can be automatically solved; on the other hand, blank paper at the photosensitive body can be returned and put into use again, thereby reducing paper waste.
In the image forming apparatus, the first conveying roller pair may be rotated in a reverse direction to return the sheet to the sheet feeding unit.
At this time, the first conveying roller pair rotates in the reverse direction to return the blank sheet located upstream of the image forming unit to the paper feeding unit, and after the image forming apparatus resumes normal operation, the blank sheet returned to the paper feeding unit is put into use again.
The image forming apparatus may further include a conveyance branch path having one end that is connected to the first conveyance path, and a connection position between the sheet feeding unit and the first conveyance roller pair; a paper storage unit disposed on the conveying branch path; when the first detecting unit detects that there is no paper at the fixing unit of the first conveying path and the second detecting unit detects that there is paper at the image forming unit including the photosensitive body of the first conveying path, toner particles on the surface of the paper are removed and the paper is returned to the paper storage unit.
Thus, the blank paper positioned at the photoreceptor of the first conveying path can be returned to the paper storage unit, and the problem of paper jam of the image forming apparatus can be automatically solved; on the other hand, the user can process the paper returned to the paper storage unit according to the requirement, so that the user can conveniently select a processing mode.
The image forming apparatus may further include a second conveyance path that forms an annular double-sided path with the first conveyance path, and the second conveyance path may be provided with a third conveyance roller pair and a second sheet discharge unit in this order; a third detection unit that detects whether or not paper is present at a third conveying roller pair of the second conveying path; when the third detection unit detects that there is paper at the third conveying roller pair, the paper is returned to the paper storage unit, or the paper is returned to the second paper discharge unit.
The paper at the third conveying roller pair previously passes through the fixing unit of the first conveying path, so that the paper at the third conveying roller pair belongs to used paper printed with characters or patterns, and the paper is returned to the paper storage unit, or the paper is returned to the second paper discharge unit, so that the paper returned to the paper storage unit or the second paper discharge unit is uniformly processed subsequently.
In the above-described reading apparatus, when a jam occurs, the sheet on the first conveyance path may be conveyed first, and then the sheet on the second conveyance path may be conveyed.
Therefore, the jam processing operation flow of the image forming device can be specified, and the operation efficiency is improved.
In the above-described reading apparatus, the fixing unit may be kept stationary when the first detection unit detects that there is a sheet at the fixing unit in the first conveyance path.
Therefore, the user can manually draw out the jammed paper at the fixing unit, so as to prevent the fixing unit from operating improperly to cause the serious paper jam.
The reading apparatus may further include a fourth detection unit that detects presence or absence of paper at the first conveying roller pair of the first conveying path; a fourth conveying roller pair disposed on the first conveying path between the paper feeding unit and the first conveying roller pair; when the first detection unit detects that paper is present at the fixing unit of the first conveying path and the second detection unit detects that no paper is present at the image forming unit including the photosensitive body of the first conveying path, the first conveying roller ejects the paper to the paper feeding unit; when the first detection unit detects that paper is present at the fixing unit of the first conveying path and the second detection unit detects that paper is present at the photosensitive body of the first conveying path, the fourth detection unit detects whether paper is present at the first conveying roller pair of the first conveying path; if the fourth detection unit detects that paper exists at the first conveying roller pair of the first conveying path, the first conveying roller pair is kept static; and if the fourth detection unit detects that no paper exists in the first conveying roller pair of the first conveying path, the fourth conveying roller pair ejects the paper to the paper feeding unit.
Thus, when the first detection unit detects that there is paper in the fixing unit of the first conveyance path and the second detection unit detects that there is no paper in the photosensitive body of the first conveyance path, the first conveyance roller ejects the paper to the paper feed unit to eject the blank paper upstream of the photosensitive body.
When the first detection unit detects that paper is present in the fixing unit of the first conveying path and the second detection unit detects that paper is present in the photosensitive body of the first conveying path, if the fourth detection unit detects that paper is present in the first conveying roller pair of the first conveying path, it is indicated that the same paper may be jammed in the fixing unit, the photosensitive body, and the first conveying roller pair remains stationary, so that the jammed paper can be manually drawn out by a user, thereby preventing the jamming problem from being more serious due to improper operation of the first conveying roller pair.
In the above reading apparatus, the paper storage unit may be a manual feed unit.
Therefore, the blank paper returned to the hand paper feeding unit can be subsequently used as hand paper feeding so as to be put into use again, and paper jamming caused by surface wrinkles in the automatic paper feeding process of the device is prevented.
In the above reading apparatus, the number of the paper feed units may be plural, and when one of the paper feed units is empty, the paper feed unit may be returned to the empty paper feed unit.
Thereby, the paper from which the surface toner particles are removed or the paper having an image already on one side is separated from the non-transferred blank paper.
Drawings
FIG. 1 is a schematic view of an image forming apparatus according to an embodiment of the present invention;
fig. 2 to 4 are flowcharts of jam processing of the image forming apparatus shown in fig. 1.
Detailed Description
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Further, it will be apparent to those skilled in the art that many alternatives thereof are possible in light of the above disclosure, and that the present invention is not limited to the preferred embodiments described herein.
Fig. 1 is a schematic view of an image forming apparatus according to an embodiment of the present invention.
The image forming apparatus 100 is an apparatus that forms an image on a recording medium such as paper.
Hereinafter, a specific configuration of the image forming apparatus 100 according to the present invention will be described in detail with reference to fig. 1.
In the present embodiment, the image forming apparatus 100 has a sheet conveyance system that conveys a sheet along a predetermined conveyance path. The predetermined conveyance path includes a first conveyance path 210. A paper feed unit 310, a first conveying roller pair 410, an image forming unit 330 including a photosensitive body 450, a fixing unit 340 including a fixing roller pair 460, a first paper discharge unit 510 including a second conveying roller pair 420, and a jam detection unit are provided in this order on a first conveying path 210 of the paper conveying system.
The paper feeding unit 310 is located at the beginning of the first conveying path 210, and is used for placing paper to be conveyed.
The first conveying roller pair 410 is located downstream of the paper feed unit 310 and upstream of the image forming unit 330, and the first conveying roller pair 410 rotates in the forward direction to apply a driving force to the paper conveyed along the first conveying path 210, thereby conveying the paper discharged from the paper feed unit 310 to the photosensitive body 450.
The first conveying roller pair 410 includes a first drive roller and a first driven roller, and the first driven roller is driven to rotate in accordance with the rotation of the first drive roller.
The image forming unit 330 forms a toner image on the photoreceptor 450, and then, superimposes the toner image on the sheet conveyed along the first conveying path 210, and applies an electric charge from the back side of the sheet by a corona transfer electrode of corona discharge. The corona transfer electrode and the corona charging electrode are identical in structure. In the case of negatively charged toner, the transfer paper is positively charged, and the toner on the photoreceptor 450 is transferred to the transfer paper.
The first paper discharge unit 510 is located at the end of the first conveying path 210, the second conveying roller pair 420 is located downstream of the fixing unit 340, and the second conveying roller pair 420 rotates in the forward direction to apply a driving force to the paper at the fixing unit 340, thereby continuing to convey the paper on which the image formation is completed along the first conveying path 210.
In addition to the first conveying roller pair 410 and the second conveying roller pair 420, the sheet conveying system includes a plurality of conveying roller pairs for conveying sheets along the second conveying path 220. For example, fig. 1 shows that the sheet transport system further includes a fourth transport roller pair 440 along the first transport path 210. The fourth conveying roller pair 440 is disposed on the first conveying path 210 between the paper feeding unit 310 and the first conveying roller pair 410.
The image forming apparatus 100 further includes: a first detecting unit 610 provided on the first conveying path 210, wherein the first detecting unit 610 is adjacent to the fixing unit 340.
When the jam determination unit determines that a jam has occurred, the first detection unit 610 is adapted to detect the presence or absence of paper at the fixing unit 340 of the first conveyance path 210.
The image forming apparatus 100 further includes: and a second detecting unit 620 provided on the first conveying path 210, wherein the second detecting unit 620 is adjacent to the image forming unit 330.
The second detecting unit 620 is adapted to detect the presence or absence of paper at the image forming unit 330 of the first conveying path 210 when the jam judging unit judges a jam.
The image forming apparatus 100 further includes: a fourth detecting unit 640 provided on the first conveying path 210, wherein the fourth detecting unit 640 is adjacent to the first conveying roller pair 410.
When the jam determination unit determines that a jam has occurred, the fourth detection unit 640 is adapted to detect the presence or absence of paper at the first conveying roller pair 410 of the first conveying path 210.
The image forming apparatus 100 includes a plurality of detecting units provided along the first conveying path 210 in addition to the first detecting unit 610, the second detecting unit 620, and the fourth detecting unit 640. For example, fig. 1 shows a case where the image forming apparatus 100 further includes a fifth detecting unit 650 and a sixth detecting unit 660. The fifth detecting unit 650 is adjacent to the fourth conveying roller pair 440, and when the jam detecting unit determines that the jam occurs, the fifth detecting unit 650 is adapted to detect whether there is paper at the fourth conveying roller pair 440 of the first conveying path 210; the sixth detection unit 660 is located between the sixth conveying roller pair 460 and the second conveying roller pair 420, and when the jam detection unit determines that a jam has occurred, the sixth detection unit 660 is adapted to detect whether or not there is paper between the sixth conveying roller pair 460 and the second conveying roller pair 420.
The predetermined conveying path further includes a second conveying path 220. The second conveying path 220 and the first conveying path 210 enclose an annular double-sided passage.
The second conveying path 220 includes a first end 221 and a second end 222, a position where the first end 221 is transferred to the first conveying path 210 is located between the paper feeding unit 310 and the first conveying roller pair 410, and a position where the second end 222 is transferred to the first conveying path 210 is located between the second conveying roller pair 420 and the sixth detection unit 660.
The second conveying path 220 is provided with a third conveying roller pair 430 and a second sheet discharge unit 520 in this order. The third conveying roller pair 430 is close to the second end 222, and the second sheet discharge unit 520 is located on a side of the third conveying roller pair 430 away from the first end 221.
Specifically, the second conveying path 220 includes a second main conveying path and a second branch conveying path, and the first end 221 and the second end 222 serve as both ends of the second main conveying path. One end of the second main transport path is provided on the second main transport path, and the second sheet discharge unit 520 is located at the other end of the second main transport path. The third conveying roller pair 430 is located on the second conveying branch path.
The first conveying path 210 and the second conveying path 220 cooperate to realize double-sided printing or copying of paper. In the process of duplex printing or copying of paper, firstly, the paper feeding unit 310 discharges paper, and the paper is conveyed to the third conveying roller pair 430 through the first conveying path 210, so as to realize printing or copying of one surface of the paper; then, the paper enters the second conveying path 220 by the reverse driving force of the third conveying roller pair 430, and is conveyed to the first end 221 along the second conveying path 220; finally, the paper enters the first conveying path 210 again under the driving force of the first conveying roller pair 410, and is conveyed to the first paper discharge unit 510 through the first conveying path 210, so that the other surface of the paper is printed or copied, and double-sided printing or copying of the paper is completed.
In addition to the third conveying roller pair 430, the sheet conveying system includes a plurality of conveying roller pairs for conveying sheets along the second conveying path 220. For example, fig. 1 shows a case where three conveying roller pairs are provided on the second conveying path 220, and the second conveying path 220 further includes a seventh conveying roller pair 470, an eighth conveying roller pair 480, and a ninth conveying roller pair 490 in this order from the second end 222 to the first end 221.
The image forming apparatus 100 further includes: a third detecting unit 630 disposed on the second conveying path 220, wherein the third detecting unit 630 is adjacent to the third conveying roller pair 430.
When the jam determination unit determines that a jam has occurred, the third detection unit 630 is adapted to detect the presence or absence of paper at the third conveying roller pair 430 of the second conveying path 220.
The image forming apparatus 100 includes a plurality of detecting units provided along the second conveying path 220, in addition to the third detecting unit 630. For example, fig. 1 shows a case where the image forming apparatus 100 further includes a seventh detecting unit 670 and an eighth detecting unit 680. Wherein the seventh detecting unit 670 is located between the seventh conveying roller pair 470 and the eighth conveying roller pair 480, and when the jam detecting unit determines that the jam has occurred, the seventh detecting unit 670 is adapted to detect whether or not there is paper between the seventh conveying roller pair 470 and the eighth conveying roller pair 480; the eighth detecting unit 680 is located between the eighth conveying roller pair 480 and the ninth conveying roller pair 490, and when the jam detecting unit determines that the jam has occurred, the eighth detecting unit 680 is adapted to detect whether or not there is a sheet between the eighth conveying roller pair 480 and the ninth conveying roller pair 490.
The predetermined conveyance path further includes conveyance branch path 230, one end of which is connected to first conveyance path 210, and the connection position is located between paper feed unit 310 and first conveyance roller pair 410.
Specifically, the conveying branch path 230, the first conveying path 210, and the second conveying path 220 are connected to each other at the first end 221.
The sheet transport system further includes a transport roller pair for transporting a sheet along the transport branch path 230. For example, fig. 1 shows a case where the tenth conveying roller pair 500 is provided on the conveying branch path 230.
The image forming apparatus 100 further includes a detection unit provided along the conveyance path 230. The image forming apparatus 100 further includes a ninth detection unit 690, for example, as shown in fig. 1. Wherein the ninth detecting unit 690 is adjacent to the tenth conveying roller pair 500. When the jam detection unit determines that a jam has occurred, the ninth detection unit 690 is adapted to detect the presence or absence of paper at the tenth conveying roller pair 500 of the conveying branch path 230.
The image forming apparatus 100 further includes: and a paper storage unit 710 provided on the conveyance branch path 230. The paper accumulating unit 710 is located at an end of the conveying branch path 230 remote from the first conveying path 210.
The following describes the jam processing flow of the image forming apparatus 100 in detail for different jam scenarios with reference to fig. 1 to 4.
The first embodiment is as follows: referring to fig. 2, when the jam determination unit determines a jam, step S11 is performed: the first detection unit 610 detects the presence or absence of paper in the fixing unit 340 of the first conveying path 210, and executes step S12: the second detection unit 620 detects the presence or absence of paper in the image forming unit 330 of the first conveying path 210.
Whether or not the sheet is still the sheet after image fixing is greatly related to the position of the sheet on the first conveyance path 210 when the jam occurs. Specifically, there is a large relationship with the relative position of the sheet and the fixing unit 340 of the first conveyance path 210. If the paper is located upstream of the fixing unit 340, the paper is still unfixed, and can be reused after toner is removed; if the sheet is downstream of the fixing unit 340, the image fixed on the sheet may be directly discharged.
Scenario one: if the first detecting unit 610 detects that there is no paper in the fixing unit 340 of the first conveying path 210, and the second detecting unit 620 detects that there is no paper in the image forming unit 330 of the first conveying path 210, the first conveying roller pair 410 rotates in the reverse direction to convey the paper in the reverse direction, so that the paper without blank transfer on the first conveying path 210 is conveyed in the reverse direction. The second conveying roller pair 420 rotates in the forward direction to discharge the sheet.
When the first detection unit 610 detects that there is no paper in the fixing unit 340 of the first conveying path 210 as described above, the first conveying roller pair 410 rotates in the reverse direction to convey the paper without the toner image transferred thereto, and the second conveying roller pair 420 continues conveying and discharging the paper, so that the blank paper can be separated from the paper on which the characters or the patterns are printed, and the blank paper can be reused, which contributes to reducing paper waste.
Further, when the first detection unit 610 detects that there is no paper in the fixing unit 340 of the first conveying path 210, the image forming apparatus 100 automatically processes the jammed paper by adjusting the turning directions of the first conveying roller pair 410 and the second conveying roller pair 420, which is advantageous for reducing the workload of the user and improving the work efficiency.
In this embodiment, the first conveying roller pair 410 rotates in the reverse direction to return the sheet to the sheet feeding unit 310.
At this time, the first conveying roller pair 410 rotates in the reverse direction to return the blank sheet upstream of the image forming unit 330 to the paper feeding unit 310, and after the image forming apparatus 100 resumes normal operation, the blank sheet returned to the paper feeding unit 310 is put into use again.
Scenario two: in another embodiment, the first conveying roller pair 410 rotates in reverse to retract the sheet onto the conveying branch path 230, and the tenth conveying roller pair 500 rotates in reverse to retract the sheet onto the sheet storage unit 710.
The image forming apparatus 100 further includes: a switching unit 800, the switching unit 800 being located between the first conveying path 210 and the conveying branch path 230, the switching unit 800 being adapted to connect or disconnect the first conveying path 210, the switching unit 800 being further adapted to connect or disconnect the conveying branch path 230. When the switching unit 800 turns on the first conveying path 210 and cuts off the conveying branch path 230, the first conveying roller pair 410 rotates in reverse along the first conveying path 210 to retract the sheet to the sheet feeding unit 310. When the switching unit 800 cuts off the first conveying path 210 and turns on the conveying branch path 230, the first conveying roller pair 410 rotates in the reverse direction to retract the paper onto the conveying branch path 230, and further retracts the paper onto the paper storage unit 710.
Example two: when the first detecting unit 610 detects that there is no paper at the fixing unit 340 of the first conveying path 210, the second detecting unit 620 detects that there is paper at the image forming unit 330 including the photosensitive body 450 of the first conveying path 210.
When the first detecting unit 610 detects that there is no paper in the fixing unit 340 of the first conveying path 210 and the second detecting unit 620 detects that there is paper in the image forming unit 330 including the photosensitive body 450 of the first conveying path 210, the photosensitive body 450 is rotated in the reverse direction to convey the paper in the reverse direction, and unfixed toner on the paper is transferred to the photosensitive body 450 to retract the paper.
Here, the second detecting unit 620 detects that there is a paper at the image forming unit 330 of the first conveying path 210, which indicates that a part of the toner particles on the surface of the photosensitive body 450 have been transferred onto the paper, but the paper has not been fixed by the fixing unit 340, and therefore before the paper is returned, the toner particles on the surface of the paper are removed to be reused.
After the toner image is formed on the photoreceptor 450, the photoreceptor rotates to overlap the paper, and a corona transfer electrode using corona discharge imparts an electric charge from the back side of the paper. In the case of negatively charged toner, the sheet is positively charged, and the toner on the photoreceptor 450 is moved to the sheet. When the unfixed toner on the paper is removed, the photoreceptor 450 is reversed to be overlapped with the paper with the unfixed image, and a charge is given by corona discharge in the reverse direction to that at the time of transfer. The toner on the paper is moved to the photoreceptor 450 to be removed.
This allows the blank sheet positioned on the photosensitive member 450 of the first conveying path 210 to be retracted, thereby automatically solving the problem of paper jam in the image forming apparatus 100; on the other hand, the blank sheet at the photosensitive body 450 is returned and reused, thereby reducing waste of sheets.
The number of the paper feeding units 310 is plural, and when one of the paper feeding units 310 is empty, the paper feeding unit is returned to the empty paper feeding unit. Thereby separating the paper from which the surface toner particles are removed from the untransferred blank paper.
Example three: when the first detecting unit 610 detects that there is no paper at the fixing unit 340 of the first conveying path 210 and the second detecting unit 620 detects that there is no paper at the image forming unit 330 of the first conveying path 210, step S13 is performed: the third detection unit 630 detects the presence or absence of paper at the third conveying roller pair 430 of the second conveying path 220.
Scenario three: in this embodiment, when the third detection unit 630 detects that there is a sheet at the third conveying roller pair 430, the sheet is returned to the sheet storage unit 710.
Specifically, when the third detection unit 630 detects that there is a sheet at the third conveying roller pair 430, the seventh conveying roller pair 470, the eighth conveying roller pair 480, and the ninth conveying roller pair 490 all rotate in the forward direction to sequentially convey the sheet at the third conveying roller pair 430 to the seventh conveying roller pair 470, the eighth conveying roller pair 480, and the ninth conveying roller pair 490 along the second conveying path 220, the ninth conveying roller pair 490 conveys the sheet to the tenth conveying roller pair 500, and the tenth conveying roller pair 500 rotates in the reverse direction to further convey the sheet to the sheet storage unit 710 in the reverse direction.
In this embodiment, the paper storage unit 710 is a manual paper feeding unit.
Thus, the sheet on which the image has been formed on one side or the sheet through which the unfixed toner has been removed can be discharged separately from the blank sheet.
Scenario four: in another embodiment, when the third detection unit 630 detects that there is paper at the third conveying roller pair 430, the paper is retracted to the second paper discharge unit 520.
Specifically, the third conveying roller pair 430 rotates in the reverse direction, and the sheet at the third conveying roller pair 430 is returned to the second sheet discharge unit 520.
The paper sheet at the third conveying roller pair 430 previously passes through the fixing unit 340 of the first conveying path 210, and thus the paper sheet at the third conveying roller pair 430 belongs to a used paper sheet printed with characters or patterns, and thus the paper sheet is returned to the paper storage unit 710, or the paper sheet is returned to the second paper discharge unit 520, so that the paper sheet returned to the paper storage unit 710 or the second paper discharge unit 520 is subsequently processed in a unified manner.
In this embodiment, when a paper jam occurs, the paper on the first conveyance path 210 is conveyed first, and then the paper on the second conveyance path 220 is conveyed.
Thereby, the jam processing operation flow of the image forming apparatus 100 can be standardized, and the operation efficiency can be improved.
Scene five: when the first detection unit 610 detects that there is paper at the fixing unit 340 of the first conveyance path 210, the fixing unit 340 remains stationary.
Thus, the user can manually draw out the jammed sheet at the fixing unit 340 to prevent the fixing unit 340 from operating improperly to cause a serious degree of jam.
Referring to fig. 3, scenario six: when the first detection unit 610 detects that there is paper in the fixing unit 340 of the first conveyance path 210 and the second detection unit 620 detects that there is no paper in the image forming unit 330 of the first conveyance path 210, the first conveyance roller pair 410 ejects the paper to the paper feed unit 310.
Thus, the first conveying roller pair 410 ejects the paper to the paper feed unit 310 to eject the blank paper upstream of the image forming unit 330.
In this embodiment, the first conveying roller pair 410 rotates in the reverse direction to return the sheet to the sheet feeding unit 310.
Referring to fig. 4, example four: when the first detecting unit 610 detects that there is paper at the fixing unit 340 of the first conveying path 210 and the second detecting unit 620 detects that there is paper at the image forming unit 330 of the first conveying path 210 including the photosensitive body 450, step S14 is performed: the presence or absence of paper at the first conveying roller pair 410 of the first conveying path 210 is detected by the fourth detecting unit 640.
Scene seven: when the fourth detection unit 640 detects that there is a sheet in the first conveying roller pair 410 of the first conveying path 210, the first conveying roller pair 410 is kept stationary.
And a scene eight: when the fourth detection unit 640 detects that there is no paper in the first conveying roller pair 410 of the first conveying path 210, the fourth conveying roller pair 440 rotates in the reverse direction to eject the paper to the paper feeding unit 310.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. An image forming apparatus includes a sheet transport system having a sheet feeding unit, a first transport roller pair, an image forming unit including a photoreceptor, a fixing unit including a fixing roller pair, a first sheet discharging unit including a second transport roller pair, and a jam detecting unit, which are sequentially provided on a first transport path of the sheet transport system;
it is characterized in that the utility model also has:
a first detection unit that detects presence or absence of paper at a fixing unit of a first conveyance path when the jam determination unit determines a jam;
a second detection unit that detects the presence or absence of paper at the image forming unit including the photoconductor of the first conveyance path;
when the first detection unit detects that there is no paper at the fixing unit of the first conveyance path and the second detection unit detects that there is no paper at the image forming unit including the photosensitive body of the first conveyance path, the first conveyance roller pair rotates in the reverse direction to convey the paper in the reverse direction, and the second conveyance roller pair rotates in the forward direction to discharge the paper.
2. The image forming apparatus according to claim 1,
the image forming unit rotates and transfers the toner image formed on the photoreceptor to a sheet of paper by the photoreceptor in registration with the sheet of paper,
the method is characterized in that:
when the first detection unit detects that there is no paper at the fixing unit of the first conveyance path and the second detection unit detects that there is paper at the image forming unit including the photosensitive body of the first conveyance path, the photosensitive body is rotated in the reverse direction and the paper is conveyed in the reverse direction, and unfixed toner on the paper is transferred to the photosensitive body and the paper is retracted.
3. The image forming apparatus according to claim 1 or 2, wherein the first conveying roller pair rotates in reverse to retreat the sheet to the sheet feeding unit.
4. The image forming apparatus according to claim 3, further comprising:
a conveyance branch path having one end connected to the first conveyance path, and a connection position between the paper feed unit and the first conveyance roller pair;
a paper storage unit disposed on the conveying branch path;
when the first detecting unit detects that there is no paper at the fixing unit of the first conveying path and the second detecting unit detects that there is paper at the image forming unit including the photosensitive body of the first conveying path, toner particles on the surface of the paper are removed and the paper is returned to the paper storage unit.
5. The image forming apparatus according to claim 4, further comprising:
a second conveying path which forms an annular two-sided channel with the first conveying path, wherein a third conveying roller pair and a second paper discharge unit are sequentially arranged on the second conveying path;
a third detection unit that detects whether or not paper is present at a third conveying roller pair of the second conveying path;
when the third detection unit detects that there is paper at the third conveying roller pair, the paper is returned to the paper storage unit, or the paper is returned to the second paper discharge unit.
6. The image forming apparatus according to claim 5, wherein when a jam occurs, the sheet on the first conveyance path is conveyed first, and then the sheet on the second conveyance path is conveyed.
7. The image forming apparatus according to any one of claims 1 to 6, wherein the fixing unit is kept stationary when the first detecting unit detects that there is paper at the fixing unit of the first conveyance path.
8. The image forming apparatus according to claim 7, further comprising:
a fourth detection unit that detects the presence or absence of paper at the first conveying roller pair of the first conveying path;
a fourth conveying roller pair which is arranged on the first conveying path between the paper feeding unit and the first conveying roller pair;
when the first detection unit detects that paper is present at the fixing unit of the first conveying path and the second detection unit detects that no paper is present at the image forming unit including the photosensitive body of the first conveying path, the first conveying roller ejects the paper to the paper feeding unit;
detecting, by a fourth detecting unit, whether or not there is paper at the first conveying roller pair of the first conveying path when the first detecting unit detects that there is paper at the fixing unit of the first conveying path and the second detecting unit detects that there is paper at the image forming unit including the photosensitive body of the first conveying path;
if the fourth detection unit detects that paper exists at the first conveying roller pair of the first conveying path, the first conveying roller pair keeps static;
and if the fourth detection unit detects that no paper exists in the first conveying roller pair of the first conveying path, the fourth conveying roller pair ejects the paper to the paper feeding unit.
9. The image forming apparatus according to claim 4, wherein the paper storage unit is a manual feed unit.
10. The image forming apparatus according to claim 2, wherein the number of the paper feed units is plural, and when one of the paper feed units is empty, the paper feed unit is retracted to the empty paper feed unit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910871302.9A CN112506013B (en) | 2019-09-16 | 2019-09-16 | Image forming apparatus with a toner supply device |
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| CN201910871302.9A CN112506013B (en) | 2019-09-16 | 2019-09-16 | Image forming apparatus with a toner supply device |
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| CN112506013B true CN112506013B (en) | 2022-07-08 |
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| CN105657209A (en) * | 2014-11-27 | 2016-06-08 | 柯尼卡美能达株式会社 | Image forming apparatus, image forming system, and image forming method |
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| CN108303864A (en) * | 2017-01-13 | 2018-07-20 | 柯尼卡美能达办公系统研发（无锡）有限公司 | Image forming apparatus |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8960672B2 (en) * | 2012-12-27 | 2015-02-24 | Ricoh Company | Sheet feeder control method, sheet feeder, and image forming apparatus |
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| JP2002348011A (en) * | 2001-03-16 | 2002-12-04 | Canon Inc | Recording device |
| CN102950918A (en) * | 2011-08-19 | 2013-03-06 | 佳能株式会社 | Printing apparatus and method for conveying printing medium |
| CN105657209A (en) * | 2014-11-27 | 2016-06-08 | 柯尼卡美能达株式会社 | Image forming apparatus, image forming system, and image forming method |
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