JP2004106999A - Sheet inspection device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To automatically carry out recovery when a defective sheet is output, and to prevent temperature rise of each device arranged in a downstream side of an image forming device. <P>SOLUTION: This device has a reader 501 for reading out information of a sheet from the sheet passing through the first conveying passage 504, a flapper 506 for switching a conveying direction in a branch part for paths 504, 513, and a flapper 507 for switching a conveying direction in a branch part for the path 513 and a path 508. The device has an inspection tray 505 for holding the sheet guided by the path 513 and a path 509 to be ejected outside the device, a buffer tray 502 for holding temporarily the sheet guided by the conveying path 508, and a refeeding means 503 for refeeding the sheet held in the buffer tray 502 to the conveying passage 504. The device has a CPU 510 for comparing information of the sheet concerned in record of an image with the sheet information read out by the reader 501, and for controlling the flappers 506, 507 in response to a result therein, a cooling fan 520 for cooling at least one or both of the sheet and the reader 501, and the like. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a sheet inspection device that inspects a sheet on which an image is formed.
[0002]
[Prior art]
Conventionally, a sheet output from an image forming apparatus such as a copying machine is used as it is, or is processed as a bundle by a post-processing device such as a finisher, that is, a bundle discharge process, a binding process, a folding process, and a bookbinding process. And post-processing such as sorting. In these cases, a mode such as a cover mode or an interleaf mode is provided, and the first page, the last page, or the middle page of the sheet is supplied from a cassette provided in the image forming apparatus or a sheet feeding tray. It is controlled so that the inserted paper can be inserted. For this reason, it is possible to insert a bundle other than sheets from a single paper feed stage, specifically, as a “cover”, “insert”, or “back cover” from another paper feed stage. By feeding paper from a special tray on which "insertion sheets" are placed, similar insertion processing is possible. At this time, since the processing of the sheet for insertion is a mere sheet conveying operation, the number of inserted sheets (place) and the number of inserted sheets can be arbitrarily set for each bundle.
[0003]
[Problems to be solved by the invention]
However, various misprints such as image defects of the output sheet due to a defect of the image forming apparatus, skew of the image, wrinkles or broken edges of the paper, defective density or color misregistration, and a difference in the color of the paper due to a paper setting mistake. Can occur. However, after these are output from the image forming apparatus, it is not determined whether or not they are normal. Therefore, for example, even if the image transferred to the sheet is not completely fixed, even if the image is disturbed due to contact with a structure on the traveling path, there is a problem that the output is continued as it is. Also, if a bookbinding process or the like is performed by a post-processing device such as a finisher, a single defective sheet is treated as a single book as a bad book, and not only a defective sheet but also other There is a problem that a normal sheet is wasted. Also, due to the heat of the sheets, the temperature of the entire apparatus or a part of the apparatus such as a post-processing apparatus located downstream of the image forming apparatus increases, or the sheets adhere to each other on the sheet stacking tray. There is also a problem.
[0004]
An object of the present invention is to eliminate a defective sheet without continuing the output as it is, when a defective sheet is output due to a state of the image forming apparatus or the like, a paper setting error, and the like, and automatically output the defective sheet. Another object of the present invention is to provide an apparatus for re-outputting a sheet corresponding to the above, recovering the sheet, and preventing a temperature rise of each apparatus arranged downstream of the image forming apparatus.
[0005]
[Means for Solving the Problems]
A representative configuration of the present invention for achieving the above object is a first transport path for guiding a sheet on which an image is recorded, and a reading unit that reads information on the sheet from the sheet passing through the first transport path. A second conveyance path that branches from the first conveyance path and guides the sheet on the downstream side in the conveyance direction from the reading unit, and guides the sheet at a branch portion of the first and second conveyance paths. A first switching unit that switches a transport path to be performed, a third transport path that branches from the second transport path and guides the sheet, and guides the sheet at a branch portion of the second and third transport paths. Switching means for switching the conveyance path to be used, first holding means for holding a sheet guided by the second conveyance path and discharged to the outside of the apparatus, and a sheet guided by the third conveyance path. Second holding means for temporarily holding A re-feeding unit that sends the sheet held in the second holding unit to the first conveyance path again, and compares the information of the sheet related to image recording with the information of the sheet read by the reading unit. And control means for controlling the switching means in accordance with the result thereof, and cooling means for cooling at least one or both of the sheet and the reading means.
[0006]
BEST MODE FOR CARRYING OUT THE INVENTION
Preferred embodiments of the present invention will be illustratively described in detail below with reference to the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention only to them unless otherwise specified. Absent.
[0007]
[First Embodiment]
An inspection apparatus according to a first embodiment of the present invention will be described with reference to FIGS.
[0008]
FIG. 3 is a schematic diagram of the entire system, which includes an image forming apparatus 100, an inspection apparatus 500, and a post-processing apparatus 300. Hereinafter, each will be described.
[0009]
<< Overall Configuration of Image Forming Apparatus Main Body >>
First, with reference to FIG. 4, the overall schematic configuration of the image forming apparatus according to the embodiment of the present invention will be described along the flow of sheets. A copying machine will be described as an example of the image forming apparatus.
[0010]
In FIG. 4, the image forming apparatus main body 100 has a scanner section B as image reading means for reading image information of a book document at an upper portion thereof, and has an image forming section C as image forming means at a lower portion thereof. The seat deck D is attached to the lower part.
[0011]
The scanner section B has a scanning system light source 201, a platen glass 202, a document pressure plate 203 that can be opened and closed with respect to the scanning main body A, a mirror 204, a lens 205, a light receiving element (photoelectric conversion element) 206, an image processing section, and the like. It is configured. Then, a book document or a sheet document such as a book, thick paper, curled paper, or the like is placed on the platen glass 202 with the document surface facing down, the back surface is pressed by the document pressure plate 203, and the document is set in a stationary state, and reading is started. When the key is pressed, the scanning optical source 201 scans the lower part of the platen glass 202 in the direction of arrow a in FIG. Image information of the document read by the scanning light source 201 is processed by an image processing unit, converted into an electric signal, and transmitted to the laser scanner 111.
[0012]
Here, the image forming apparatus main body 100 functions as a copier if a processing signal of the image processing unit is input to the laser scanner 111, and functions as a printer if an output signal of the computer is input. Further, if a signal from another facsimile apparatus is received or a signal from the image processing unit is transmitted to another facsimile apparatus, the apparatus functions as a facsimile apparatus.
[0013]
On the other hand, the sheet cassette 1 is mounted below the image forming section C. In the present embodiment, two sheet feeding units U1 and U2 are mounted, and two (in total, four) cassettes 1a and 1b are respectively mounted. I am trying to put it on. The sheets accommodated in the cassettes 1a and 1b are fed out by a pickup roller 3 serving as a feed rotating body, and are separated and fed one by one by a cooperative action of a feed roller 4 and a retard roller 5. The sheet is conveyed by conveying rollers 104 and 105, guided by a registration roller 106, and fed to the image forming section C by the roller 106 in synchronization with the image forming operation.
[0014]
The image forming section C includes an electrophotographic photosensitive drum 112, an image writing optical system 113, a developing device 114, a transfer charger 115, and the like. Then, a laser beam corresponding to the image information emitted from the laser scanner 111 is scanned by the image writing optical system 113 on the surface of the photosensitive drum 112 uniformly charged by the charger to form a latent image. A toner image is formed on the image by the developing device 114, and the toner image is transferred to the first surface of the sheet by the transfer charger 115 on the sheet conveyed in synchronization with the rotation of the photosensitive drum 112 by the registration roller 106.
[0015]
Reference numeral 117 denotes a conveyance unit that conveys the sheet on which the toner image is formed, 118 denotes a fixing device, and 119 denotes a discharge roller. The sheet on which the toner image has been formed is conveyed to the fixing device 118 by the conveying unit 117, and is heated and pressed to fix the toner image on the sheet surface.
[0016]
When images are recorded on both sides of the sheet, the sheet discharged from the fixing device 118 is nipped by the discharge roller 119, and the discharge roller reverses when the rear end of the sheet passes through the branch path 207. After being once placed on the sheet double-sided tray 121, the sheet is conveyed by the conveying rollers 104 and 105, reaches the registration roller 106, and the inverted sheet is formed on the second surface in the same manner as described above. Is discharged. Further, it is also possible to reversely discharge the sheet on which an image is formed on one side via the branch path 207.
[0017]
In FIG. 4, reference numeral 6 denotes a manual feed tray, and reference numeral 7 denotes a feed roller that separates and feeds the sheets set on the manual feed tray 6 one by one.
[0018]
全体 Overall configuration of post-processing device｝
5, the post-processing apparatus 300 receives the sheet discharged from the inspection apparatus 500 from the pair of entrance rollers 302, and conveys the sheet to the inside. A transport roller pair 303 is provided downstream of the entrance roller pair 302, and a sheet detection sensor 331 is provided between the entrance roller pair 302 and the transport roller pair 303.
[0019]
Downstream of the transport roller pair 303 is a punch unit 350, and downstream of the punch unit 350 are disposed a large transport roller 305 and pressing rollers 312, 313, and 314 that press and transport the surrounding sheet.
[0020]
The switching flapper 311 switches between the non-sort path 321 and the sort path 322. The switching flapper 310 at the entrance of the sort path 322 switches between the sort path 322 and a buffer path 323 for temporarily storing sheets.
[0021]
A transport roller 306 is provided in the sort path 322. On an intermediate tray (hereinafter, referred to as “processing tray”) 316 as a stacking tray disposed downstream of the sort path 322, temporary accumulation, alignment, stapling, and the like of sheets can be performed.
[0022]
A discharge roller 307 at the exit of the sort path 322 discharges the sheet onto the processing tray 316. The upper bundle discharge roller 318b is supported by the swing guide 315, and when the swing guide 315 moves to the closed position, cooperates with the lower bundle discharge roller 318a disposed on the processing tray 316 to remove the sheet on the processing tray 316. The bundle is conveyed and discharged on the stack tray 320.
[0023]
That is, the swing guide 315 is inclined, and the lower bundle discharge roller 318a and the upper bundle discharge roller 318b form a roller pair to convey the sheets on the processing tray 316 in a bundle.
[0024]
In FIG. 5, P denotes a sheet, 301 denotes a control circuit, 309 denotes a discharge roller, 332 and 333 denote sheet detection sensors, and 340 denotes a stapler.
[0025]
全体 Overall configuration of inspection equipment｝
With reference to FIG. 1, an overall schematic configuration of an inspection device 500 according to a first embodiment of the present invention will be described.
[0026]
Reference numeral 504 denotes a first conveyance path for receiving a sheet output from the image forming apparatus main body 100. The transport path 504 is connected to an exit for transferring sheets to the post-processing device 300. Reference numeral 501 denotes a reading device as reading means for reading sheet information such as an image, a color, and an outer shape of the sheet. The reading device 501 is arranged such that a CCD, a CIS, or the like reads both sides of a sheet. The reading width is equal to or larger than the maximum sheet passing sheet width, which is sufficient to read the outer shape of the sheet. Reference numerals 506 and 507 denote flapper as switching means for switching the sheet conveying direction. A flapper 506 serving as a first switching unit is for guiding a sheet to a branch path 513 which is a second conveyance path branched from the first conveyance path 504, and at least a maximum sheet passing sheet from the reading device 501. It is located at a distance of more than a long distance. A flapper 507 as a second switching unit is for guiding a sheet to a transport path 508 which is a third transport path branched from the branch path 513. Reference numerals 502 and 505 denote trays serving as holding means for stacking sheets guided by the flappers 506 and 507. The buffer tray 502 as the second holding means is provided with a re-feeding means 503. The sheet is guided to the buffer tray 502 by the transport path 508. The tray 502 and the transport path 508 are arranged so that the sheet re-fed from the buffer tray 502 passes through the reading device 501 again. The inspection tray 505 serving as the first holding unit is loaded with sheets guided by the transport path 509 constituting the second transport path together with the branch path, and is exposed outside the inspection apparatus main body. Reference numeral 520 denotes a cooling fan as cooling means for simultaneously cooling the sheet sent from the image forming apparatus 100 to the inspection apparatus 500 and the reading apparatus 501. A storage device 511 stores sheet information (image data and the like) related to image recording and image data read by the reading device 501. Reference numeral 512 denotes a comparison device for comparing the read image with reference data (information on a sheet relating to image recording). A CPU 510 controls the operation of the inspection apparatus 500 and controls the image forming apparatus main body 100 and the post-processing apparatus 300. An operation unit 514 is used when the state of the inspection device 500 or an operation instruction to be described later is issued.
[0027]
｝ Operation of inspection equipment｝
The general operation of the inspection device 500 will be described with reference to the flowcharts of FIGS.
[0028]
The sheet output from the image forming apparatus main body 100 passes through the conveyance path 504. On the way, the sheet is rapidly cooled by the cooling fan 520. Immediately thereafter, the sheet information is read by the reading device 501 (step S601). The read information is converted into data and compared with the original data stored in the storage device 511 in advance (step S602). If the result of the comparison is OK, the sheet passes through the conveyance path 504 as it is (step S603), is conveyed in the direction of arrow E in FIG. Inspection OK is displayed on the operation unit 514, and the user is notified that the output is well. This operation is sequentially repeated.
[0029]
Next, a case where the result of the comparison is NG will be described. In response to the NG signal, the CPU 510 switches the flapper 506 in the direction of arrow A in FIG. 1 and guides a sheet determined to be defective (hereinafter, a defective sheet) to the branch path 513. Further, the flapper 507 is switched in the direction of arrow C in FIG. 1, and the defective sheet is guided in the direction of the conveyance path 509 (step S604). As a result, the defective sheet is discharged to the inspection tray 505. The inspection tray 505 is exposed outside the inspection device, and the discharged sheet can be immediately visually recognized by the user.
[0030]
At this time, in the image forming apparatus main body 100, the next several sheets (sheets that have already passed through the fixing device, sheets on which an image is being formed, sheets fed from a cassette, and the like) are in process. (Step S605). Here, the CPU 510 sends a command to the CPU 596 of the image forming apparatus main body 100 to perform processing from image formation to fixing during processing and temporarily stop the subsequent operations. Then, a substitute sheet for the defective sheet is fed again, and an instruction is issued to form an image. When the sheet in process is guided to the inspection device 500, the sheet information is read by the reading device 501 (step S606). If OK, the CPU 510 switches the flapper 506 in the direction of arrow A in FIG. 1 and the flapper 507 in the direction of arrow D in FIG. 1 (step S607). As a result, the sheets in progress are guided to the buffer tray 502 and are sequentially stacked.
[0031]
Thereafter, a sheet in place of the defective sheet is re-output, and the re-output sheet passes through the reading device 501 (step S609), and information is read (step S610). Switching is performed in the direction of arrow B in FIG. 1 (step S611), and switching is performed so that the sheet is conveyed in the direction of arrow E in FIG. Then, the sheet is guided to the post-processing device 300.
[0032]
Thereafter, the work-in-progress sheets stacked on the buffer tray 502 are sequentially fed by the re-feeding means 503 (steps S612 and 613), passed through the transport path 504, and guided to the post-processing device 300. At this time, the information of the sheet is read again by the reading device 501, and it is checked whether double feeding, folding, or the like has occurred (step S614). Thereafter, CPU 510 instructs CPU 596 of image forming apparatus main body 100 to perform the remaining jobs.
[0033]
Of course, when the sheet re-output from the image forming apparatus or the sheet re-fed from the buffer tray becomes the inspection NG again, it is discharged to the inspection tray 505 and sent to the CPU 596 of the image forming apparatus main body 100. Specify output again. A series of subsequent operations follow the operations described above.
[0034]
As described above, according to the present embodiment, the sheet information (image recording signal) related to image recording is compared with the information (read image signal) obtained by reading the sheet recorded based on the information. In addition, by detecting image disturbance due to a defect inside the image forming apparatus main body, and by reading the outer shape information and color information of the sheet together with the read image signal, the conveyance state such as skew of the sheet, the registration of the image, the sheet Can be detected. By outputting the defective sheet to the inspection tray 505, the user can easily visually recognize what the defect is.
[0035]
When continuous output is performed, non-defective products among the in-process sheets in the image forming apparatus main body are stored in the buffer tray 502 without being discarded, and a substitute sheet for a defective sheet is output again from the image forming apparatus main body. Then, the sheets stored in the buffer tray 502 are re-fed, so that even if a defective sheet occurs, the apparatus automatically recovers without stopping the apparatus, so that the user does not need to be stationed in front of the apparatus. , Increasing productivity. Since there is no sheet to be discarded other than the defective sheet, waste is eliminated.
[0036]
Also, in the case where bookbinding processing or the like is performed by a post-processing device or the like, since a defective sheet is not conveyed to the post-processing device, it is possible to guarantee that the bound product is good.
[0037]
Further, by cooling the sheets by the cooling fan 520, the sheets stacked on the buffer tray 502, the inspection tray 505, or the stack tray 320 or the processing tray 316 of the post-processing device 300 are prevented from sticking to each other, and It is possible to provide high-quality images. The cooling fan 520 cools the sheet being conveyed and also cools the reading device 501. Since the reading device 501 reads at a position near the sheet being conveyed, it is almost directly affected by the heat of the sheet. Therefore, cooling the reading device 501 can prevent the temperature of the reading device 501 from rising. In addition, due to the wind of the cooling fan 520, paper dust adhering to the surface of the reading device 501 can be removed, and more accurate inspection can be performed.
[0038]
[Second embodiment]
With reference to FIG. 2, an overall schematic configuration of an inspection device according to a second embodiment of the present invention will be described.
[0039]
In the present embodiment, a part of the configuration is changed and a new configuration is added to the first embodiment, and only the characteristic portions will be described in detail. The configuration and the like of the entire apparatus are the same as those described in the first embodiment. Members having the same functions are denoted by the same reference numerals, and description thereof will be omitted.
[0040]
In FIG. 2, reference numeral 520 denotes a cooling fan as a heat pipe cooling means, 530 denotes a heat pipe roller in which a heat pipe is embedded, and 531 denotes a driven roller. The heat pipe roller 530 used as a cooling unit has a radiation fin (not shown) in a part thereof, and by cooling the radiation fin with the cooling fan 520, the sheet being conveyed can be cooled. Further, the heat pipe roller pairs 530 and 531 also have a role as sheet conveying rollers. In addition, the cooling fan 520 can prevent a rise in the temperature of the reading device 501 by cooling a part of the reading device 501. Accordingly, it is possible to prevent sheets stacked on the buffer tray 502, the inspection tray 505, or the stack tray 320 or the processing tray 316 of the post-processing apparatus 300 from sticking to each other, and to provide a higher quality image. In addition, it is possible to perform inspection with higher accuracy.
[0041]
[Other embodiments]
In the above-described embodiment, the inspection apparatus is described as an independent apparatus. However, the inspection apparatus is not limited to this, and may be, for example, integrated with the image forming apparatus main body. Further, the post-processing device is mounted after the inspection device. However, the present invention is not limited to this, and it is a matter of course that a simple stacking means such as a stacker may be used. In addition, as the reading device in the inspection device, a CCD, a CIS, or the like is illustrated, but it is a matter of course that the reading device is not limited thereto.
[0042]
Further, in the second embodiment described above, a configuration using a roller in which a heat pipe is embedded is exemplified as the cooling means. However, the present invention is not limited to this. For example, the heat pipe itself is brought into contact with a sheet. It is good also as a structure cooled. Further, the configuration having a fan as a heat pipe cooling means for cooling the heat pipe is exemplified, but the heat pipe cooling means is not provided, and the sheet is cooled only by the heat pipe or a roller in which the heat pipe is embedded. Is also good.
[0043]
Further, in the above-described embodiment, a fan is exemplified as the cooling unit. However, the cooling unit is not limited to this, and may be another cooling unit that can cool the sheet or the reading device.
[0044]
【The invention's effect】
As described above, according to the present invention, by comparing sheet information (image recording signal) related to image recording with information (read image signal) obtained by reading a sheet recorded based on the information, In addition, by detecting image disturbance due to a defect inside the image forming apparatus main body, and by reading the outer shape information and color information of the sheet together with the read image signal, the conveyance state such as skew of the sheet, the registration of the image, the sheet Can be detected. Then, by outputting the defective sheet to the first holding means, the user can easily visually recognize what the defect is.
[0045]
In the case where continuous output is performed, non-defective sheets among the in-process sheets in the image forming apparatus main body are stored in the second holding means without being discarded, and the substitute sheet for the defective sheet is re-read from the image forming apparatus main body. Output, and then the sheet stored in the second holding means is re-fed, so that even if a defective sheet occurs, it is automatically recovered without stopping the device, so that the user can stay in front of the device. There is no need to do so, and productivity is improved. Since there is no sheet to be discarded other than the defective sheet, waste is eliminated.
[0046]
Further, by cooling the reading unit and the sheet by the cooling unit, it is possible to prevent the temperature of the reading unit from rising and to simultaneously cool the sheet. Thereby, it is possible to prevent the temperature of the reading unit from rising, and to perform inspection with higher accuracy. It is possible to provide high-quality images.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram showing a schematic configuration of a sheet inspection device according to a first embodiment; FIG. 2 is an explanatory diagram showing a schematic configuration of a sheet inspection device according to a second embodiment; FIG. FIG. 4 is a schematic diagram illustrating a schematic configuration of an entire system including an inspection device and a post-processing device. FIG. 4 is a schematic diagram illustrating a schematic configuration of an image forming apparatus main body. FIG. 5 is a schematic diagram illustrating a schematic configuration of a post-processing device. 6: Flow chart showing the schematic operation of the sheet inspection device
[Explanation of symbols]
A: Scanning body B: Scanner section C: Image forming section D: Sheet deck P: Sheets U1, U2: Feeding unit 1: Sheet cassettes 1a, 1b: Cassette 3: Pickup roller 4: Feed roller 5: Retard roller 6: Manual feed tray 7 Feed roller 100 Image forming devices 104 and 105 Transport roller 106 Registration roller 111 Laser scanner 112 Electrophotographic photosensitive drum 113 Image writing optical system 114 Developing device 115 Transfer charger 117 Conveying section 118 Fixing device 119 Discharge roller 121 Sheet double-sided tray 201 Scanning light source 202 Platen glass 203 Document pressure plate 204 Mirror 205 Lens 206 Light receiving element (photoelectric conversion element)
207 branch path 300 post-processing device 301 control circuit 302 inlet roller pair 303 transport roller pair 305 large transport roller 306 transport roller 307 discharge roller 309 discharge roller 310 switching flapper 311 switching flapper 312 313, 314 Pressing roller 315 Swing guide 316 Processing tray 318a Lower bundle discharge roller 318b Upper bundle discharge roller 320 Stack tray 321 Non-sort path 322 Sort path 323 Buffer path 331, 332, 333 Sheet Detection sensor 340 stapler 350 punch unit 500 inspection device 501 reading device 502 buffer tray 503 re-feeding means 504 transport path 505 inspection trays 506 and 507 flapper 508 transport path 509 transport path 10 ... CPU
511 storage device 512 comparison device 513 branch path 514 operation unit 520 cooling fan 530 heat pipe roller 531 driven roller 596 CPU

Claims (13)

A first conveyance path for guiding a sheet on which an image is recorded;
Reading means for reading information on the sheet from the sheet passing through the first transport path;
A second conveyance path that branches from the first conveyance path and guides the sheet on a downstream side in the conveyance direction from the reading unit;
First switching means for switching a conveying path for guiding the sheet at a branching portion of the first and second conveying paths;
A third conveying path that branches from the second conveying path and guides the sheet;
A second switching unit that switches a conveyance path for guiding the sheet at a branch portion of the second and third conveyance paths;
First holding means for holding a sheet guided by the second conveyance path and discharged to the outside of the apparatus;
Second holding means for temporarily holding a sheet guided to the third conveyance path;
Re-feeding means for feeding the sheet held by the second holding means back to the first conveyance path;
Control means for comparing information on the sheet relating to image recording with information on the sheet read by the reading means, and controlling the switching means according to the result;
Cooling means for cooling at least one or both of the sheet and the reading means,
A sheet inspection device comprising: The sheet for which the sheet information read by the reading unit is determined to be OK with respect to the sheet information related to the image recording is guided by the first switching unit as it is on the first transport path,
The sheet whose sheet information read by the reading unit is determined to be NG with respect to the sheet information related to recording of the image is guided to the second transport path by the first switching unit, and the first switching unit outputs the first sheet. The sheet inspection apparatus according to claim 1, wherein the sheet is discharged to a holding unit. The already fed sheet following the sheet determined to be NG is
After the image is recorded, the information is read by the reading unit in the first transport path, and the information is guided to the second transport path by the first switching unit.
The sheet whose sheet information read by the reading unit is determined to be OK with respect to the sheet information related to the image recording is guided to the third conveyance path by the second switching unit, and the second sheet is guided to the second conveyance path. Temporarily held by the holding means of
The sheet for which the sheet information read by the reading unit is determined to be NG with respect to the sheet information relating to the image recording is guided by the second switching unit as it is along the second transport path, and 3. The sheet inspection device according to claim 2, wherein the sheet inspection device is discharged to the first holding unit. The sheet inspection apparatus according to claim 2, wherein an image recording of a sheet which is determined to be NG is performed again in place of the NG sheet. The sheet inspection apparatus according to claim 4, wherein after re-outputting the sheet in place of the NG sheet, the sheet held by the second holding unit is re-fed. The sheet inspection device according to claim 1, wherein the cooling unit is disposed at a position where the reading unit is cooled. The sheet inspection device according to claim 1, wherein the cooling unit is a fan. The sheet inspection apparatus according to any one of claims 1 to 5, wherein a heat pipe is used as the cooling unit. The sheet inspection apparatus according to claim 8, wherein the heat pipe or a roller in which the heat pipe is embedded abuts on a sheet during conveyance. The sheet inspection apparatus according to claim 8, further comprising a heat pipe cooling unit configured to cool a part of the heat pipe or a roller in which the heat pipe is embedded. The sheet inspection device according to claim 10, wherein the heat pipe cooling unit is a fan. 12. The image forming apparatus according to claim 1, wherein the image forming apparatus includes an image forming unit that forms an image on a sheet and a fixing unit that fixes the image on the sheet. 2. The sheet inspection apparatus according to claim 1. The sheet inspection apparatus according to claim 12, wherein the cooling unit is disposed between the fixing unit and the reading unit.

Images