TWI403151B - Method of processing document - Google Patents

Description

File processing method

The present invention relates to a file processing method, and more particularly to a file processing method of an automatic paper feeding device.

Referring to the 20th to 41st drawings, the automatic paper feeding device 800 includes a casing 802, a paper feed passage 804, a reverse passage 806, and a paper feed tray 808. The paper take-up roller 810, the separation roller group 812, the plurality of paper feed roller groups 814, the scanning area 816, the paper ejection roller group 818, and the paper ejection tray 820.

The paper feed passage 804 is defined in the casing 802, and includes an upstream paper feed opening 822 and a downstream paper discharge opening 824. The reverse passage 806 is disposed in the casing 802, and one end of the reverse passage 806 is connected to the downstream paper discharge opening 824. The other end is connected to the downstream of the separation roller group 812 in the paper feed passage 804, and the reverse passage 806 and a portion of the paper feed passage 804 form a loop shape.

The paper feed tray 808 is disposed at the upstream paper feed opening 822 of the paper feed passage 804 for carrying the documents P1 and P2 to be processed, and the paper take-up roller 810 is disposed at the upstream paper feed opening 822 of the paper feed passage 804 for picking up The uppermost one of the files P1, P2, P1, and the document P1 are brought into the paper feed path 804. The separation roller set 812 is disposed at the upstream paper feed opening 822 and is located downstream of the paper take-up roller 810. The paper separation roller set 812 is provided with a paper separation drive wheel 826 and a paper separation driven wheel 828 for separating the superimposed documents. The documents P1 and P2 are sequentially brought into the paper feed path 804. In the specific implementation, the paper separation driven wheel 828 can be replaced by a paper separation sheet.

The paper feed roller set 814 is disposed on both sides of the paper feed passage 804 and the reverse feed passage 806 for driving the documents P1 and P2. The scan area 816 is disposed at the middle of the paper feed passage 804 for scanning the documents P1 and P2. The paper ejection roller set 818 is disposed at the downstream paper feed opening 822 of the paper feed path 804 for taking the documents P1, P2 out of the paper feed path 804. The paper exit tray 820 is disposed outside the downstream paper feed opening 824 and is located directly below the paper feed tray 808.

The file processing method of the conventional automatic paper feeding device includes the following steps: Step 902: stacking the files P1 and P2 to be processed on the paper feed tray 808, as shown in FIG. 20; Step 904: Picking up the paper roller 810 and The separation roller set 812 brings the document P1 into the paper feed path 804, respectively, as shown in the twenty-first figure; step 906: the paper feed roller set 814 brings the document P1 to the scan area 816, at this time, the scan area 816 scans The front side of the document P1 is as shown in Fig. 22; step 908: the paper feed roller set 814 brings the document P1 from the scanning area 816 to the paper ejection roller set 818, and the paper ejection roller set 818 passes the document P1 from the downstream paper exit opening. 824 exits the paper feed path 804, and the eject roller set 818 also grips the trailing end of the document P1, as shown in FIG. 23; step 910: the eject roller set 818 grips the trailing end of the document P1 and rotates in the opposite direction The document P1 is brought into the paper feed path 804 by the downstream paper exit opening 824, as shown in the twenty-fourth figure; step 912: the paper exit roller set 818 continues to rotate in the reverse direction and the document P1 is brought into the reverse channel 806, and The file P1 is in a state opposite to the front and back ends of the reverse channel 806, such as the twenty-fifth. Step 914: The paper feed roller set 814 brings the document P1 from the reverse channel 806 into the paper feed path 804 and passes through the scan area 816. At this time, the scan area 816 scans the reverse side of the document P1, as shown in the twenty-sixth figure. Shown Step 916: The paper feed roller set 814 brings the document P1 from the scanning area 816 to the paper ejection roller set 818. At this time, the paper take-up roller 810 brings the document P2 into the paper feed path 804, and the paper separation roller set 812 holds the document P2. , proceeding to block the file P2 as shown in the twenty-seventh figure; step 918: the paper ejection roller set 818 grips the trailing end of the document P1 and rotates in the reverse direction, and the document P1 is brought into the paper feeding by the downstream paper exit opening 824. The channel 804, and the separation roller set 812 continues to block the document P2 from proceeding to avoid the document P1 and the document P2 overlapping in the paper feed path 804, as shown in the twenty-eighth figure; step 920: the paper feed roller set 814 will again The document P1 is brought into the paper feed path 804 by the reverse channel 806, and the document P1 is again in the state of the opposite end of the paper feed path 804 opposite to the front and back sides, that is, the document P1 returns to the state of entering the paper feed path 804 for the first time; The paper feed roller set 814 continues to bring the document P1 to the scan area 816. At this time, the scan area 816 stops the scan job; the separation roller set 812 brings the document P2 into the paper feed path 804, as shown in the twenty-ninth figure; Step 922: The paper feed roller set 814 takes the document P1 from the scanning area 816 The paper feed roller set 818, at this time, the document P2 is carried by the paper feed roller set 814 to the scanning area 816 as shown in FIG. 30; step 924: the paper exit roller set 818 takes the document P1 out of the downstream paper exit opening 824. The paper feed path 804; the document P2 is brought to the scan area 816 by the paper feed roller set 814. At this time, the scan area 816 scans the front side of the document P2 as shown in FIG. 31; step 926: the file P1 completely exits the paper feed path. 804 is placed on the paper exit tray 820. At this time, the document P1 completes the double-sided scanning job; the paper feed roller group 814 brings the document P2 from the scanning area 816 to the paper ejection roller group 818, and the paper ejection roller group 818 sets the document P2 The downstream paper exit opening 824 exits the paper feed path 804, and the paper ejection roller set 818 also grips the trailing end of the document P2, as shown in the thirty-second diagram; step 928: the paper exit roller set 818 holds the trailing end of the document P2 And rotating in the reverse direction, the document P2 is brought into the paper feed passage 804 by the downstream paper discharge opening 824, as shown in the thirty-third figure; Step 930: the eject roller group 818 continues to rotate in the reverse direction and bring the document P2 into the inversion channel 806, and the file P2 is in the reverse channel 806 in a state in which the head end is opposite to the front and back, as shown in the thirty-fourth figure. Step 932: The paper feed roller set 814 brings the document P2 from the reverse channel 806 into the paper feed channel 804 and passes through the scan area 816. At this time, the scan area 816 scans the reverse side of the document P2, as shown in the thirty-fifth figure. Step 934: The paper feed roller set 814 brings the document P2 from the scanning area 816 to the paper ejection roller set 818. At this time, the paper take-up roller 810 brings the next document P3 into the paper feed path 804, and the paper separation roller. The group 812 holds the document P3 to block the document P3 from proceeding as shown in the thirty-sixth figure; step 936: the paper exit roller set 818 holds the trailing end of the document P2 and rotates in the reverse direction, and the document P2 is discharged from the downstream. The opening 824 is brought into the paper feed path 804, and the separation roller set 812 continues to block the document P3 from proceeding to avoid the document P3 and the document P2 overlapping in the paper feed path 804, as shown in the thirty-seventh figure; Step 938: Send The paper roller set 814 again brings the document P2 from the reverse channel 806 to the paper feed channel 804, while the text The piece P2 is again in a state in which the head end is opposite to the front and back sides in the paper feed path 804, that is, the document P2 returns to the state of entering the paper feed path 804 for the first time; the paper feed roller group 814 continues to bring the document P2 to the scanning area 816, At this time, the scanning area 816 stops the scanning job; the separation roller group 812 brings the document P3 into the paper feeding path 804 as shown in the thirty-eighth figure; Step 940: The paper feeding roller set 814 moves the document P2 from the scanning area 816. Brought to the eject roller set 818, at this time, the document P3 is taken to the scanning area 816 by the paper feed roller set 814, as shown in the thirty-ninth figure; step 942: the eject roller set 818 passes the document P2 from the downstream paper exit opening 824 takes out the paper feed path 804; the document P3 is brought to the scanning area 816 by the paper feed roller set 814, at this time, the scanning area 816 scans the front side of the document P3, as shown in the fortieth figure; Step 944: The document P2 completely exits the paper feed path 804 and is placed on the paper exit tray 820. At this time, the document P2 completes the duplex scanning operation; the paper feed roller group 814 brings the document P3 from the scanning area 816 to the paper ejection roller group 818. The eject roller set 818 exits the document P3 from the downstream exit opening 824 to the paper feed path 804, and the eject roller set 818 also grips the trailing end of the document P3, as shown in FIG.

As described above, the subsequent steps of the file P3 are also repeated as described above. The above steps need to reverse the files P1 and P2 twice, and pass through the scanning area 816 three times, that is, the 3 Pass scanning operation. When the files P1 and P2 pass the 3 Pass scan operation, the original stacking sequence can be maintained, and the files P1 and P2 are not inverted.

However, the above processing method has to wait for the previous document to complete the steps of front scanning, reverse document scanning, reverse scanning, and reverse image rewinding before the next document is brought into the paper feeding path 804 for scanning. The wait time for this method is too long to process a large number of files efficiently and quickly.

SUMMARY OF THE INVENTION The object of the present invention is to provide a file processing method for reducing the waiting time to efficiently and quickly process a file in view of the above-mentioned drawbacks of the prior art.

In order to achieve the above object, the file processing method provided by the present invention is applied to a scanning device, and the scanning device is configured to scan the first file and the second file sequentially entering the scanning device, and is provided with a paper feeding channel, a scanning area and a reverse channel. The paper feeding passage is provided with an upstream paper feeding opening and a downstream paper discharge opening, the scanning area is arranged in the paper feeding passage, one end of the reverse conveying channel is connected to the downstream paper discharge opening, and the other end is connected between the upstream paper feeding opening and the scanning area and is sent The paper path forms a loop, and the file processing method comprises the following steps: First, when the first document enters the paper feed path from the upstream paper feed opening, after the first pass through the scan area, and before the reverse path has been reached, the second The document enters the paper feed path from the upstream paper feed opening; Thereafter, when the first file leaves the scanning area and passes through the reverse channel for the first time, the second file passes through the scanning area for the first time in the paper feeding path; then, when the first document passes the second scanning in the paper feeding path After the area, and before the inversion channel has been reached, the second file leaves the scanning area and enters the inversion channel for the first time; after that, after the second file passes the scanning area for the second time in the paper path, and has not yet reached the inversion Before the channel, the first file leaves the scanning area and enters the inversion channel a second time; and finally, after the first file passes the scanning area for the third time in the paper path, and has not reached the downstream paper exit opening, the second file Enter the inversion channel for the second time.

In summary, in the file processing method of the present invention, when the first file passes through the scanning area for the first time, the second file is immediately sent to the paper feed path for subsequent processing. Thereby, the file processing method of the present invention can process two files at the same time and shorten the waiting time of the next file, so as to speed up processing of the file and improve processing efficiency.

200‧‧‧Automatic paper-feed double-sided scanner

202‧‧‧Shell

204‧‧‧ Paper feed channel

206‧‧‧Reversal channel

208‧‧‧ input tray

210‧‧‧ Pickup roller

212‧‧‧Separate roller set

214‧‧‧Feeding path roller

216‧‧‧Reverse channel wheel

218‧‧‧Scanning area

220‧‧‧Rewinding roller set

222‧‧‧Drawback tray

224‧‧ ‧ paper feed opening

226‧‧‧ paper exit

228‧‧‧Split drive wheel

230‧‧ ‧ paper passive wheel

G‧‧‧交交口

P1, P2, P3, P4‧‧ documents

The first to the nineteenth drawings are schematic views of the file processing method of the present invention applied to a scanner.

The twenty-fifth to forty-firstth drawings are schematic views of a conventional file processing method applied to a scanner.

In the present invention, the file processing method 100 is applied to the automatic paper-feeding double-sided scanner 200. In a specific implementation, the document processing method 100 can also be applied to a paper-feeding double-sided photocopier, a paper-feed double-sided printing machine. In office products such as watch machines.

Referring to the first figure, the automatic paper-feeding double-sided scanner 200 includes a casing 202, a paper feed passage 204, a reverse passage 206, a paper feed tray 208, a paper take-up roller 210, a separation roller group 212, and a plurality of feeds. Paper path roller 214, reverse channel roller 216, scanning area 218, paper ejection roller set 220 and paper ejection tray 222.

The paper feed passage 204 is opened in the casing 202, and includes an upstream paper feed opening 224 and a downstream paper discharge opening 226. The reverse passage 206 is disposed in the casing 202, and one end of the reverse passage 206 is connected to the downstream of the paper feed passage 204. The paper exit opening 226 is connected to the paper feed passage 204 to form an intersection G, and is located between the separation roller group 212 and the scanning area 218. In this embodiment, the other end of the inversion passage 206 is connected to the downstream of the separation roller group 212, and the reverse passage 206 and a portion of the paper feed passage 204 form a loop shape.

The paper feed tray 202 is disposed at the upstream paper feed opening 224 of the paper feed path 204 for carrying the documents P1 and P2 to be processed, and the paper take-up roller 210 is disposed at the upstream paper feed opening 224 of the paper feed path 204 for capturing The uppermost one of the files P1, P2, P1, and the document P1 are brought into the paper feed path 204. The separation roller set 212 is disposed at the upstream paper feed opening 224 and located downstream of the paper take-up roller 210. The paper separation roller set 212 is provided with a paper separation drive wheel 228 and a paper separation driven wheel 230 for separating overlapping documents, and The documents P1 and P2 are sequentially brought into the paper feed path 204. In the specific implementation, the paper separation driven wheel 230 can be replaced by a paper separation sheet.

The paper feed roller set 214 is disposed on both sides of the paper feed passage 204 for conveying the documents P1 and P2, and the reverse passage roller 216 is disposed at the middle of the reverse passage 206 for the documents P1 and P2 to be output from the downstream paper discharge opening 226. It is sent to the upstream of the paper feed path 204. The scanning area 218 is disposed at a middle portion of the paper feed path 204 for scanning the documents P1, P2. The paper ejection roller group 220 is disposed at the downstream paper feed opening 226 of the paper feed passage 204, and is provided with a paper ejection driving wheel 228 and a paper ejection passive wheel 230 for feeding the documents P1 and P2 out of the paper feeding passage 204. The paper ejection tray 222 is disposed outside the downstream paper feed opening 226 and is located directly below the paper feed tray 208.

The file processing method of the present invention includes the following steps: Step 102: Stack the files P1 and P2 to be processed on the input tray 208 as shown in the first figure; Step 104: As shown in the second figure, the pickup roller 210 And the separation roller set 212 respectively takes the file P1 Into the paper feed path 204; Step 106: As shown in the third figure, the paper feed roller set 214 sends the document P1 to the scan area 218, at this time, the scan area 218 scans the front side of the document P1; when the trailing end of the document P1 passes When the intersection G is, the take-up roller 210 and the separation roller set 212 respectively bring the document P2 into the paper feed passage 204; Step 108: As shown in the fourth figure, the paper feed roller set 214 continuously transfers the document P1 to make the file P1 Through the scanning area 218, at this time, the file P2 is blocked at the intersection G. In the embodiment, the separation roller group 212 holds the file P2, so that the file P2 is stopped at the intersection G, and in the specific implementation, the closest The paper feed roller set 214 of the intersection G stops rotating or reversely rotating, so that the document P2 is blocked at the intersection G; Step 110: As shown in the fifth figure, the paper feed roller set 214 transfers the document P1 to the paper ejection roller. Group 220, the eject roller set 220 continues to exit the document P1 from the downstream feed opening 226 and exits the paper feed path 204. When the trailing end of the document P1 is sent to the scan area 218, the document P2 is continuously transferred in the paper feed path 204. In the embodiment, the separation roller group 212 continuously transmits the document P2, so that The piece P2 is sent to the downstream of the paper feed path 204. In the specific implementation, the paper feed roller set 214 closest to the intersection G continuously transfers the document P2, so that the document P2 is sent downstream of the paper feed path 204; Step 112: As shown in the sixth figure, when the trailing end of the document P1 reaches the eject roller group 220, the eject roller group 220 rotates in the reverse direction and the document P1 is brought into the paper feed path 204 by the downstream paper feed opening 226, and the document P2 is continuously transmitted to Scanning area 218; Step 114: As shown in the seventh figure, the paper ejection roller set 220 continues to rotate in the reverse direction and sends the document P1 to the inversion channel roller 216 in the inversion channel 206, and the file P1 is in the inversion channel 206. When the head end is opposite to the front and back sides, when the document P1 passes through the reverse channel roller 216, the paper ejection roller 228 of the paper ejection roller group 220 descends and is away from the paper ejection passive wheel 230 (such as the arrow below the paper ejection driving wheel 228) As shown, at this time, the file P1 is sent to the intersection G only via the reverse channel wheel 216, file P2 The paper feed roller 214 is conveyed through the scanning area 218 and advanced toward the paper exit roller group 220; Step 116: As shown in the eighth figure, the document P1 is sent to the intersection G by the reverse channel roller 216, and the head end of the file P2 is The downstream paper exit opening 226 exits the paper feed passage 226. Since the paper ejection drive wheel 228 is lowered and away from the paper feed passive wheel 230, the document P1 and the document P2 can simultaneously pass through the downstream paper discharge opening 226. In this embodiment, the document P2 is only used by The feed roller set 214 is sent out to the downstream paper exit opening 226. In a specific implementation, the paper feed drive wheel 228 can be changed from reverse rotation to forward rotation to drive the document P2 to send the document P2 out of the downstream paper exit opening 226; 118: As shown in the ninth figure, when the document P1 leaves the paper ejection roller group 220 and is sent to the scanning area 218, the paper ejection driving wheel 228 rises and approaches the paper ejection passive wheel 230. At this time, the paper ejection roller group 220 Holding the trailing end of the document P2 and rotating in the reverse direction, the document P2 is brought into the paper feed passage 204 by the downstream paper feed opening 226; Step 120: As shown in the tenth figure, the paper feed roller set 214 continuously transfers the document P1 to make the file P1 passes through the scanning area 218, at this time, the scanning area 218 scans On the reverse side of the document P1, when the document P2 passes the reverse channel roller 216, the paper ejection drive wheel 228 of the paper ejection roller set 220 is lowered again and away from the paper ejection passive wheel 230. At this time, the document P2 is only rotated by the reverse channel roller 216. It is sent to the intersection G; Step 122: As shown in the eleventh figure, the document P2 is sent to the intersection G by the reverse channel roller 216, and the document P1 is exited from the paper feed passage 226 by the downstream paper exit 226, due to the paper exit The driving wheel 228 is lowered and away from the paper ejection passive wheel 230. The document P1 and the document P2 can pass through the downstream paper exit opening 226 at the same time. In this embodiment, the document P1 is sent to the downstream paper exit opening 226 only by being sent to the roller set 214. In a specific implementation, the paper ejection driving wheel 228 can be changed from the reverse rotation to the forward rotation to drive the document P1 to cause the document P1 to be sent out of the downstream paper exit opening 226; Step 124: As shown in the twelfth figure, when the document P2 is completely When leaving the paper ejection roller group 220 and being sent to the scanning area 218, the paper ejection driving wheel 228 rises and approaches the paper ejection passive wheel 230. At this time, the paper is ejected. The roller set 220 grips the trailing end of the document P1 and rotates in the reverse direction, and the document P1 is brought into the paper feed passage 204 by the downstream paper feed opening 226; Step 126: As shown in the thirteenth diagram, the paper feed roller set 214 continuously transmits the document P2, the document P2 is passed through the scanning area 218. At this time, the scanning area 218 scans the reverse side of the document P2. When the document P1 passes the reverse channel roller 216, the paper ejection driving wheel 228 of the paper ejection roller group 220 is lowered again and is far away from the paper ejection. The passive wheel 230, at this time, the document P1 is sent to the intersection G by only the reverse channel roller 216. At this time, the file P1 is reversed again and returns to the state of entering the paper feed passage 204 for the first time; Step 128: As shown in FIG. 14, when the document P1 completely leaves the paper ejection roller group 220 and is sent to the scanning area 218, the paper ejection driving wheel 228 rises and approaches the paper ejection passive wheel 230. At this time, the paper ejection roller group 220 is clamped. The document P2 is rotated in the reverse direction, and the document P2 is brought into the paper feed path 204 by the downstream paper feed opening 226; Step 130: As shown in the fifteenth figure, the paper feed roller set 214 continuously transfers the document P1 to pass the document P1 through the scan area. 218, at this time, the scanning area 218 stops scanning the file P1, when When the piece P2 passes the reverse channel roller 216, the paper ejection driving wheel 228 of the paper ejection roller group 220 is lowered again and away from the paper ejection passive wheel 230. At this time, the document P2 is sent to the intersection G only by the reverse channel roller 216. At this time, the file P2 is reversed again and returns to the state of entering the paper feed path 204 for the first time; Step 132: As shown in the sixteenth figure, the document P2 is sent from the reverse path 206 only by the paper feed roller 214. The paper feed path 204, the document P1 is sent to the downstream paper exit opening 226 after passing through the scanning area 218, and when the trailing end of the document P1 reaches the scanning area 218, the paper take-up roller 210 and the paper separation roller set 212 respectively carry the document P3 into the paper feed path. In the paper path 204, since the paper ejection driving wheel 228 is lowered and away from the paper ejection passive wheel 230, the document P1 and the document P2 can simultaneously pass through the downstream paper exit opening 226; Step 134: As shown in Fig. 17, when the document P2 is completely left When the paper ejection roller group 220 is sent to the scanning area 218, the paper ejection driving wheel 228 rises and approaches the paper ejection passive wheel 230. At this time, the paper ejection is performed. The roller group 220 holds the tail end of the document P1 and rotates in the forward direction, and sends the document P1 from the downstream paper feed opening 226 to the paper feed passage 204. The document P1 is sent out and placed on the paper output tray 222. At this time, the paper take-up roller 210 is The separation roller set 212 respectively feeds the document P3 from the paper feed tray 208 through the upstream paper feed opening 224 into the paper feed passage 204; Step 136: As shown in Fig. 18, when the document P2 continues to be held in the paper feed passage 204 Transfer and pass through the scan area 218, the scan area 218 stops the scan job, the separation roller set 212 continues to feed the document P3 into the paper feed path 204; and step 138: as shown in the nineteenth figure, the file P2 is scanned by the scan area 218 The paper roller set 220 sends the document P2 to the paper feed path 204, the document P2 is sent out and placed on the paper output tray 222, and is stacked on the document P1, and the paper feed roller set 214 transfers the document P3. To the scanning area 218, the pickup roller 210 and the separation roller group 212 respectively carry the document P4 into the paper feed path 204.

The subsequent operations of the files P3 and P4 are the same as the files P1 and P2.

In summary, when the document P1 passes through the scanning area 218 for the first time, the next file P2 is immediately sent to the paper feeding path 204 for subsequent processing; when the file P1 is scanned and retracted When the paper roller set 220 is sent to the paper ejection tray 222, the next file P2 has been scanned and passed through the scanning area 218. At this time, the next file P3 is immediately sent to the paper feeding path 204 for subsequent processing; When the document P2 is sent to the paper ejection tray 222, the document P3 is sent to the scanning area 218 for scanning. At this time, the next file P4 is immediately sent to the paper feeding path 204 for subsequent processing. Thereby, the file processing method 100 of the present invention can simultaneously process two files P1, P2 or P3, P4, and shorten the waiting time of the next file P2, P4 to efficiently and quickly process the file.

200‧‧‧Automatic paper-feed double-sided scanner

202‧‧‧Shell

204‧‧‧ Paper feed channel

206‧‧‧Reversal channel

208‧‧‧ input tray

210‧‧‧ Pickup roller

212‧‧‧Separate roller set

214‧‧‧Feeding path roller

216‧‧‧Reverse channel wheel

218‧‧‧Scanning area

220‧‧‧Rewinding roller set

222‧‧‧Drawback tray

224‧‧ ‧ paper feed opening

226‧‧‧ paper exit

228‧‧‧Split drive wheel

230‧‧ ‧ paper passive wheel

P1, P2‧‧ documents

G‧‧‧交交口

Claims (1)

A file processing method for a scanning device, the scanning device is configured to scan a first file, a second file, a third file and a fourth file of the scanning device sequentially, and has a paper feeding channel and a scanning a region and a reversal passage, the paper feed passage is provided with an upstream paper feed opening and a downstream paper discharge opening, the scanning region is disposed in the paper feed passage, one end of the reverse passage is connected to the downstream paper discharge opening, and the other end is connected to the upstream paper feed opening Forming a loop with the scanning area and with the paper feeding path, the processing method includes: first, when the first document enters the paper feeding passage from the upstream paper feeding opening, after the first passing through the scanning area, and has not yet reached the reverse Before the channel, the second file enters the paper feed path from the upstream paper feed opening; afterwards, when the first file leaves the scan area and passes through the reverse path for the first time, the second file passes through the scan area for the first time in the paper feed path; Then, after the first file passes through the scanning area for the second time in the paper path, and has not reached the inversion channel, the second file leaves the scanning area and enters the reverse direction for the first time. After that, after the second file passes through the scanning area for the second time in the paper path, and before the inversion channel has been reached, the first file leaves the scanning area and enters the inversion channel a second time; and secondly, when the first file After the third pass through the scanning area in the paper feed path, and before the downstream paper exit opening has been reached, the second file enters the reverse path for the second time; further, when the first document leaves the paper feed path by the downstream paper exit opening, And after the third file passes through the scanning area for the third time in the paper feeding path, before the downstream paper exit opening, the third document enters the paper feeding passage by the upstream paper feeding opening; finally, when the second document is left by the downstream paper exit opening The paper path, and the third file is in the paper path after the first pass through the scanning area, before the inversion channel has been reached, the fourth file Enter the paper feed path from the upstream paper feed opening.