CN112707195B - Sheet feeder, image forming apparatus, and automatic document feeder - Google Patents

Sheet feeder, image forming apparatus, and automatic document feeder Download PDF

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Publication number
CN112707195B
CN112707195B CN201911027804.XA CN201911027804A CN112707195B CN 112707195 B CN112707195 B CN 112707195B CN 201911027804 A CN201911027804 A CN 201911027804A CN 112707195 B CN112707195 B CN 112707195B
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path
conveying
paper
sheet
conveying path
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CN112707195A (en
Inventor
乔翔宇
卢杰
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Konica Minolta Inc
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Konica Minolta Inc
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H3/00—Separating articles from piles
    • B65H3/46—Supplementary devices or measures to assist separation or prevent double feed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H3/00—Separating articles from piles
    • B65H3/08—Separating articles from piles using pneumatic force
    • B65H3/14—Air blasts producing partial vacuum
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H3/00—Separating articles from piles
    • B65H3/18—Separating articles from piles using electrostatic force
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H7/00—Controlling article feeding, separating, pile-advancing, or associated apparatus, to take account of incorrect feeding, absence of articles, or presence of faulty articles
    • B65H7/02—Controlling article feeding, separating, pile-advancing, or associated apparatus, to take account of incorrect feeding, absence of articles, or presence of faulty articles by feelers or detectors
    • B65H7/06—Controlling article feeding, separating, pile-advancing, or associated apparatus, to take account of incorrect feeding, absence of articles, or presence of faulty articles by feelers or detectors responsive to presence of faulty articles or incorrect separation or feed
    • B65H7/12—Controlling article feeding, separating, pile-advancing, or associated apparatus, to take account of incorrect feeding, absence of articles, or presence of faulty articles by feelers or detectors responsive to presence of faulty articles or incorrect separation or feed responsive to double feed or separation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2801/00—Application field
    • B65H2801/03—Image reproduction devices

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Controlling Sheets Or Webs (AREA)
  • Sheets, Magazines, And Separation Thereof (AREA)

Abstract

The invention provides a paper feeder, and an image forming apparatus and an automatic document feeder including the same. The paper feeding device includes a first conveyance path, a second conveyance path, a double feed path, a plurality of conveyance roller pairs located in the respective paths, a separation section, a detection section, and a control section. The control section is configured to: when the detection portion in the double feed path detects that a sheet passes through, the control portion closes the separation portion after the first sheet passes through the first conveyance path, and controls the conveyance roller pairs in the first conveyance path and the double feed path to rotate in opposite directions, so as to convey the sheet in the double feed path back to the first conveyance path.

Description

Sheet feeder, image forming apparatus, and automatic document feeder
Technical Field
The present invention relates to the field of printing technologies, and in particular, to a paper feeding device, and an image forming apparatus and an automatic document feeding apparatus including the paper feeding device.
Background
In the conventional paper feeding device, a separating member is provided to separate the paper to be fed and the paper to be fed again, and when the paper separation is required, the paper feeding device can only cope with the case of double feeding of 2 sheets of paper. If the double feeding of 3 or more sheets occurs, the sheet in the middle will be carried by the sheet above or below, and the double feeding may still occur.
Disclosure of Invention
The present invention has been made to solve the problems of the prior art, and an object of the present invention is to provide a paper feeding device capable of effectively handling double feed of two or more sheets, particularly three or more sheets.
The invention also provides an image forming apparatus and an automatic document feeding apparatus including the paper feeding apparatus.
According to a first aspect of the present invention, there is provided a sheet feeding apparatus. The paper feeding device includes: the conveying device comprises a first conveying path, a second conveying path, a re-conveying path and a plurality of conveying roller pairs positioned in the paths, wherein one end of the first conveying path is communicated with a paper box, the other end of the first conveying path is communicated with the second conveying path and the re-conveying path respectively to form an intersection part, and the re-conveying path is positioned below the second conveying path. Wherein the paper feeding device further includes: a separation section located above the intersection section; a detection section, located in the re-feeding path and adjacent to the intersection, for detecting whether there is a sheet passing through the re-feeding path; and a control section for controlling the conveyance of the paper in each path.
Wherein the control section is configured to: the control part opens the separation part to separate the sheets conveyed in the first conveying path, if the number of the sheets conveyed in the first conveying path is 1, the sheets are conveyed to the second conveying path, if the number of the sheets conveyed in the first conveying path is more than 1, the first sheet positioned at the uppermost position is separated from other sheets, the first sheet enters the second conveying path, and other sheets enter the re-conveying path; and when the detection portion in the double feed path detects that the paper passes through, the control portion closes the separation portion after the first paper passes through the first conveyance path, and controls the conveyance roller pairs in the first conveyance path and the double feed path to rotate in opposite directions so as to convey the paper in the double feed path back to the first conveyance path.
Optionally, the control section is further configured to: after the paper in the double feed path is conveyed back to the first conveyance path, the control unit opens the separation unit and controls the conveyance roller pairs in the first conveyance path and the double feed path to rotate in the forward direction so as to continue conveying the paper in the first conveyance path.
Alternatively, the separating unit is a suction fan, and the air volume thereof can be adjusted according to the weight or size of the paper to be conveyed.
Optionally, the first conveying path is provided with a first conveying roller pair, the second conveying path is provided with a second conveying roller pair, the first conveying roller pair and the second conveying roller pair are respectively adjacent to the intersection, and the first paper passing through the first conveying path is: the rear end of the first sheet conveyed in the first conveying direction in the first conveying path is separated from the first conveying roller pair or the front end of the first sheet conveyed in the first conveying direction in the first conveying path passes through the second conveying roller pair.
Alternatively, a second detecting portion for detecting whether the number of sheets is greater than 1 is provided in the second conveyance path, and when the second detecting portion detects that the number of sheets in the second conveyance path is greater than 1, the control portion controls the conveyance roller pair in the second conveyance path to rotate in reverse so as to convey the sheet back to the first conveyance path.
According to another aspect of the present invention, there is provided a sheet feeding apparatus. The paper feeding device includes: the conveying device comprises a first conveying path, a second conveying path, a third conveying path, a double conveying path and a plurality of conveying roller pairs positioned in the paths, wherein the second conveying path and the double conveying path are respectively communicated between the first conveying path and the third conveying path, the double conveying path is positioned below the second conveying path, and the communication part of the first conveying path, the second conveying path and the double conveying path forms a junction part. Wherein the paper feeding device further includes: a separation section located above the intersection section; a detection section, located in the re-feeding path and adjacent to the intersection, for detecting whether there is a sheet passing through the re-feeding path; and a control section for controlling the conveyance of the paper in each path.
Wherein the control section is configured to: the control part opens the separating part to separate the paper conveyed in the first conveying path, if the number of the paper conveyed in the first conveying path is 1, the paper is conveyed to the second conveying path and then conveyed to the third conveying path, if the number of the paper conveyed in the first conveying path is more than 1, the first paper positioned at the top is separated from other paper, the first paper enters the second conveying path, and other paper enters the re-conveying path; when the detection portion detects that the number of sheets in the double feed path is 1, the control portion controls the sheets entering the double feed path to be conveyed to the third conveyance path; when the detecting portion detects that the number of sheets in the double feed path is greater than 1, the control portion closes the separating portion after the first sheet passes through the first conveyance path, and controls the conveyance roller pairs in the first conveyance path and the double feed path to rotate in opposite directions so as to convey the sheet in the double feed path back to the first conveyance path.
Optionally, the control section is further configured to: after the paper in the double feed path is conveyed back to the first conveyance path, the control unit opens the separation unit and controls the conveyance roller pairs in the first conveyance path and the double feed path to rotate in the forward direction so as to continue conveying the paper in the first conveyance path.
Optionally, the control section is further configured to: in the process of conveying the paper in the double feed path to the third conveying path, when the paper in the double feed path is conveyed to an outlet of the double feed path, detecting whether the rear end of the paper conveyed in the second conveying path in the first paper conveying direction enters the third conveying path, and if the paper enters the third conveying path, continuing to convey the paper in the double feed path; and if the paper sheet does not enter the third conveying path, temporarily stopping conveying the paper sheet in the double conveying path.
According to a third aspect of the present invention, there is provided an image forming apparatus. The image forming apparatus includes: the paper feeding device according to the present invention is a paper feeding device for feeding and conveying paper; and an image forming section for forming an image on the sheet.
According to a fourth aspect of the present invention, there is provided an automatic document feeding apparatus. The automatic document feeder includes: the paper feeding device according to the present invention is a paper feeding device for feeding and conveying paper; and a scanning section for scanning the transported sheet.
Compared with the prior art, the technical scheme of the embodiment of the invention has the following beneficial effects:
according to the paper feeding device of the embodiment of the invention, when the double feed condition occurs to the conveyed paper, the control part can control the separation of the first paper at the top from other paper, the first paper enters the second conveying path, and other paper enters the double feed path; when the detection part detects that the paper enters the double feed path, the detection part conveys other paper entering the double feed path back to the first conveying path, and then conveys the other paper again along the first conveying path, so that the problem of paper double feed can be effectively solved.
According to the paper feeding device of the embodiment of the invention, when the carried paper is in a double feeding condition, the uppermost first paper is separated from other paper by the separating part, the first paper enters the second carrying path and then enters the third path, and other paper enters the double feeding path; when the detection part detects that the number of the paper entering the double feed path is 1, conveying the paper entering the double feed path to the third conveying path; when the detecting part detects that the number of the paper entering the double feed path is more than 1, the other paper entering the double feed path is conveyed back to the first conveying path, and then the other paper is conveyed again along the first conveying path, so that the problem of paper double feed can be effectively solved.
Drawings
Other features and advantages of the present invention will be better understood by the following detailed description of alternative embodiments, taken in conjunction with the accompanying drawings, in which like characters represent the same or similar parts, and in which:
fig. 1 shows a schematic configuration of a sheet feeding device according to a first embodiment of the present invention;
fig. 2 shows a schematic configuration diagram of a sheet feeding device according to a second embodiment of the present invention;
fig. 3 shows a schematic configuration diagram of a sheet feeding device according to a third embodiment of the present invention;
fig. 4 shows a schematic configuration diagram of a sheet feeding device according to a fourth embodiment of the present invention;
fig. 5 shows a schematic configuration diagram of a sheet feeding device according to a fifth embodiment of the present invention;
fig. 6 is a schematic configuration diagram showing an automatic original transport apparatus according to an embodiment of the present invention;
fig. 7 shows a flowchart of the operation of the paper feeding apparatus according to an embodiment of the present invention.
Detailed Description
The practice and use of the embodiments are discussed in detail below. It should be understood, however, that the description herein of specific embodiments is merely illustrative of specific ways to make and use the invention, and is not intended to limit the scope of the invention. The description herein of the structural positions of the respective components, such as the directions of upper, lower, top, bottom, etc., is not absolute, but relative. When the respective components are arranged as shown in the drawings, these directional expressions are appropriate, but when the positions of the respective components in the drawings are changed, these directional expressions are also changed accordingly.
In the conventional paper feeding device, since static electricity exists between the sheets, there is a possibility that a plurality of sheets enter the conveyance path, and in this case, the sheets are re-fed. Japanese patent application laid-open No. 2005-246207 discloses a separating means for separating a conveyed sheet and a double fed sheet, but when the sheet separation is required, it can only cope with the case of double feeding 2 sheets. If the paper is re-fed by 3 or more than 3 sheets, the middle sheet is carried by the upper or lower sheet, and the re-feeding still occurs.
Japanese patent laid-open No. 2005-350239 discloses a manner of achieving separation of double fed sheets using a combination of a conveying roller and a separation roller. When the double feed of more than 3 sheets occurs, on the one hand, the paper between the conveying roller and the separating roller may be difficult to separate due to the strong separability. On the other hand, there is a high possibility that the intermediate paper will curl due to the reaction of the force. Further, the strong separability causes a scratch on the surface of the paper sheet contacting the separation roller, so that the paper sheet cannot be reused. Further, due to the strong separability, the paper may run in reverse direction, and a conveyance failure may occur.
Therefore, the technical problem to be solved by the invention is that when the double feeding of 2 or more sheets occurs, the double feeding separation mechanism is used for solving the double feeding problem, so that a user does not need to manually process the double feeding.
Fig. 1 shows a schematic configuration of a paper feeding device 100 according to a first embodiment of the present invention. The sheet feeding apparatus 100 includes a first conveyance path 110, a second conveyance path 120, a double conveyance path 130, and a plurality of conveyance roller pairs 140 located in the respective paths. One end of the first conveying path 110 communicates with the sheet cassette 150, and the other end communicates with the second conveying path 120 and the re-feeding path 130 to form intersections, and the re-feeding path 130 is located below the second conveying path 120. One end of the second conveying path 120, which is away from the first conveying path 110, communicates with a printing section 160. A corresponding sensor 141 is provided near each conveying roller pair 140 for detecting whether or not the sheet passes through the corresponding conveying roller pair 140.
The paper feeding device 100 further includes a separating portion 170, a detecting portion 180, and a control portion (not shown). The separating portion 170 is located above the intersection, and the detecting portion 180 is located in the re-feeding path 130 and adjacent to the intersection. The separating unit 170 may be an electrostatic attraction device or an attraction fan. When the transported sheet includes a plurality of sheets, the separating part 170 can separate the uppermost first sheet from the other sheets among the plurality of sheets. The detection unit 180 may be an ultrasonic detection device that can detect whether or not a sheet passes through the double feed path 130. In some embodiments, the detecting part 180 can detect that the number of passing sheets is 1 or more than 1. The control section controls the conveyance of the sheet in each of the conveyance paths.
To start, the controller activates the separating unit 170 to separate the sheets conveyed in the first conveying path 110. Specifically, when the leading end of the sheet conveyed in the first conveying path 110 in the first conveying direction (from right to left in fig. 1) leaves the first conveying path 110, the control section turns on the separating section 170 to separate the sheet conveyed in the first conveying path 110. If the number of sheets conveyed from the sheet cassette 150 to the first conveyance path 110 is 1, the control part controls the sheets to pass through the first conveyance path 110, enter the second conveyance path 120, and then be conveyed to the printing part 160. If the number of sheets conveyed in the first conveying path 110 is greater than 1, the first sheet positioned at the uppermost position is separated from the other sheets, the first sheet enters the second conveying path 120, and the other sheets enter the re-feeding path 130.
When the detection unit 180 in the double feed path 130 detects that a sheet passes through the double feed path 130, the control unit closes the separation unit 170 after the first sheet passes through the first transport path 110 (or enters the second transport path and is nipped by the pair of transport rollers in the second transport path), and controls the pair of transport rollers in the first transport path 110 and the double feed path 130 to rotate in the opposite direction so as to transport the sheet in the double feed path 130 back to the first transport path 110. At this time, the conveying roller pair 140 in the second conveying path 120 continues to rotate in the forward direction, and the first sheet is conveyed to the printing unit 160 in the first sheet conveying direction.
After the paper in the double feed path 130 is conveyed back to the first transport path 110, that is, when the rear end (left end in the figure) of the paper transported in the second transport direction opposite to the first transport direction in the double feed path 130 leaves the double feed path 130, the controller activates the separating unit 170, controls the transport roller pairs in the first transport path 110 and the double feed path 130 to rotate in the forward direction, and continues transporting the paper in the first transport direction.
If the double feed of 3 or more sheets occurs, the control section is further configured to continue the same steps when the other sheets entering the double feed path 130 include two or more sheets: when the detection unit detects that the sheet has entered the double feed path again, the detection unit conveys the sheet that has entered the double feed path back to the first conveyance path again, and then conveys the other sheets again along the first conveyance path.
According to some embodiments of the present invention, the separating part 170 is a suction fan, and the air volume of the suction fan can be adjusted according to the weight or size of the paper to be conveyed.
According to some embodiments of the present invention, the first conveying path 110 is provided with a first conveying roller pair adjacent to the intersection. For example, the first conveying roller pair is a pair of conveying rollers at the rearmost side of the first conveying path 110, that is, a pair of conveying rollers closest to the second conveying path 120.
According to some embodiments of the present invention, the second conveying path 120 is provided with a second conveying roller pair adjacent to the junction. For example, the second conveying roller pair is a pair of conveying rollers at the top of the second conveying path 120, that is, a pair of conveying rollers closest to the first conveying path 110.
Specifically, the first sheet passes through the first conveying path 110, and the rear end of the first sheet conveyed in the first conveying direction in the first conveying path 110 leaves the first conveying roller pair; alternatively, the first paper sheet passing through the first conveying path 110 is such that the leading end of the first paper sheet conveyed in the first conveying direction in the first conveying path passes through the second conveying roller pair.
According to some embodiments of the present invention, the control portion turns on the separating portion 170 when the leading end of the sheet conveyed in the first conveying direction in the first conveying path 110 passes through the first conveying roller pair.
According to some embodiments of the present invention, the control section closes the separation section 170 when the rear end of the sheet conveyed in the first conveying direction in the first conveying path 110 passes through the first conveying roller pair; alternatively, the controller may close the separating unit 170 when the leading end of the sheet conveyed in the first conveying direction in the first conveying path 110 passes through the second conveying roller pair.
Fig. 2 shows a schematic configuration of a sheet feeding device 200 according to a second embodiment of the present invention. The paper feeding device 200 includes: a first conveying path 210, a second conveying path 220, a third conveying path 230, a double conveying path 240, and a plurality of conveying roller pairs 250 located in the respective paths. The first conveying path 210 communicates with a sheet cassette 260, and the second conveying path 220 and the repeat conveying path 240 communicate between the first conveying path 210 and the third conveying path 230, respectively. The re-feeding path 230 is located below the second conveying path 220, and the first conveying path 210 forms a junction with the second conveying path 220 and the re-feeding path 240. An end of the third conveyance path 230 remote from the second conveyance path 220 communicates with a printing section 270. A corresponding sensor 251 is provided near each conveying roller pair 250 for detecting whether or not the sheet passes through the corresponding conveying roller pair 250.
The paper feeding device 200 further includes a separating unit 280, a detecting unit 290, and a control unit (not shown). The separating unit 280 is located above a junction formed by the first conveying path 210, the second conveying path 220, and the re-conveying path 240. The detecting portion 290 is located in the double feed path 240 and adjacent to the intersection, and detects whether there is a sheet passing through the double feed path 240. The detection part 290 can detect that the number of sheets passing through the double feed path 240 is 1 or more than 1. The control section controls the conveyance of the sheet in each of the conveyance paths.
Specifically, when the leading end of the paper transported in the first transport path 210 in the first transport direction (from right to left in fig. 2) leaves the first transport path 110, the control section activates the separating section 280 to separate the paper transported in the first transport path 210, if the number of the paper transported in the first transport path 210 is 1, the paper is transported to the second transport path 220 and further transported to the third transport path 230 and the printing section 270, and if the number of the paper transported in the first transport path 210 is greater than 1, the first paper positioned at the uppermost position is separated from other paper, the first paper enters the second transport path 220, and other paper enters the re-feeding path 240.
When the detecting part 290 detects that the number of sheets entering the double feed path 240 is 1, the control part controls the sheets entering the double feed path 240 to be conveyed to the third conveyance path 230. Specifically, when the sheet reaches the exit of the double feed path 240, it is detected whether the rear end of the sheet conveyed in the second conveying path 220 in the first sheet conveying direction enters the third conveying path 230, and if it has entered the third conveying path 230, the sheet in the double feed path 240 is conveyed continuously; if the sheet does not enter the third conveyance path 230, the conveyance of the sheet in the double feed path 240 is temporarily stopped, and the sheet in the double feed path 240 is conveyed again until the rear end of the sheet conveyed in the second conveyance path 220 in the first sheet conveyance direction enters the third conveyance path 230.
When the detecting part 290 detects that the number of sheets entering the double feed path 240 is greater than 1, the control part closes the separating part 280 after the first sheet passes through the first conveying path, and controls the conveying roller pairs in the first conveying path 210 and the double feed path 240 to rotate in opposite directions, so as to convey the sheet in the double feed path 240 back to the first conveying path 210. Then, after the paper in the double feed path is conveyed back to the first conveyance path, the controller turns on the separator 280, and controls the conveyance roller pairs in the first conveyance path 210 and the double feed path 240 to rotate in the forward direction, so that the paper in the first conveyance path is conveyed further.
Specifically, when the rear end of the first sheet in the first sheet conveying direction (from right to left in fig. 2) leaves the first conveying path 210 (for example, leaves the last pair of conveying rollers 250 of the first conveying path 210), the controller closes the separating portion 280, and controls the conveying roller pairs in the first conveying path 210 and the double conveying path 240 to rotate in opposite directions, so that the sheet in the double conveying path 240 is conveyed back to the first conveying path 210. At this time, the conveying roller pair 250 in the second conveying path 220 continues to rotate in the forward direction, and the first sheet is conveyed to the third conveying path 230 in the first sheet conveying direction.
After the paper in the double feed path is conveyed back to the first transport path, specifically, when the rear end of the paper in the double feed path 240 in the second paper transport direction (opposite to the first paper transport direction, from left to right in fig. 2) leaves the double feed path 240 (for example, leaves the double feed path 240 and is adjacent to the transport roller pair of the intersection), the controller turns on the separating unit 280, controls the transport roller pairs in the first transport path 210 and the double feed path 240 to rotate in the forward direction, continues to transport the paper, and repeats the above steps.
As described above, when the double feed of 2 sheets occurs, the paper conveyed in the conveying path and the paper double fed in the double feed path are sequentially conveyed to the printing section according to the paths. When 3 sheets of paper are re-fed, the paper in the conveying path is conveyed to the printing part, and the re-feeding state is detected by the detecting part on the re-feeding path. After the leading end of the re-feeding paper is guided out from the re-feeding path, the separating section starts to operate, all the conveying roller pairs rotate forward at this time, and the conveying paper in the conveying path and the re-feeding paper in the re-feeding path are sequentially conveyed to the printing section according to the paths. When more than 3 sheets are fed in a double feed, the double feed separation is realized by circulating the process according to the mode of processing 3 sheets in the double feed.
According to some embodiments of the present invention, the separating part 280 is a suction fan, and the air volume of the suction fan can be adjusted according to the weight or size of the paper to be conveyed.
Table 1 shows the relationship between the amount of plateau a of the sheet and the air volume of the suction fan.
Figure BDA0002247584220000091
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Figure BDA0002247584220000101
For example, when the sheet level a ≦ 100g, the air volume of the suction fan is 30% of the maximum air volume.
According to some embodiments of the present invention, the first conveying path 210 is provided with a first conveying roller pair, the second conveying path 220 is provided with a second conveying roller pair, and the first conveying roller pair and the second conveying roller pair are respectively adjacent to the intersection. The first paper sheet passing through the first conveying path includes: the rear end of the first sheet conveyed in the first conveying direction in the first conveying path is separated from the first conveying roller pair or the front end of the first sheet conveyed in the first conveying direction in the first conveying path passes through the second conveying roller pair.
Fig. 3 shows a schematic configuration of a sheet feeding apparatus according to a third embodiment of the present invention. The paper supply apparatus of the third embodiment shown in fig. 3 is similar to that of the second embodiment shown in fig. 2, in which like reference numerals designate the same or similar parts. The difference is that in the third embodiment shown in fig. 3, an additional separating portion 281 is also provided in the double feed path 240 adjacent to the intersection, by which additional separating portion 281 it is advantageous to separate the lower sheet in the event of sheet double feed occurring so that the lower sheet enters the double feed path 240. In other embodiments, the lower sheet may enter the double feed path 240 by its own weight.
Fig. 4 shows a schematic configuration of a sheet feeding apparatus according to a fourth embodiment of the present invention. The paper supply apparatus of the fourth embodiment shown in fig. 4 is similar to that of the second embodiment shown in fig. 2, in which like reference numerals designate the same or similar parts. The difference is that in the fourth embodiment shown in fig. 4, the refeed path 240 is U-shaped, which is beneficial to saving space and improving compactness of the structure.
Fig. 5 shows a schematic configuration of a sheet feeding apparatus according to a fifth embodiment of the present invention. The paper supply apparatus of the fifth embodiment shown in fig. 5 is similar to that of the second embodiment shown in fig. 2, in which the same reference numerals denote the same or similar parts. The difference is that in the fifth embodiment shown in fig. 5, a second detecting part (or additional detecting part) 291 is provided in the second conveying path, and when the second detecting part 291 detects that the number of sheets in the second conveying path 220 is greater than 1, the control part controls the sheets in the second conveying path 220 to be conveyed back to the first conveying path 210 and then separated by the separating part 280; when the second detecting portion 291 detects that the number of the paper entering the second conveying path 220 after separation is still greater than 1, an alarm signal is sent out, at this time, the separating portion 280 may fail, and an operator detects and maintains the machine after receiving the alarm signal. If the number of sheets detected in both the second conveyance path 220 and the double feed path 240 is greater than 1, the double fed sheets in the second conveyance path 220 are preferentially processed.
Fig. 6 shows a schematic configuration diagram of an Automatic Document Feeder (ADF) 300 according to an embodiment of the present invention. The Automatic Document Feeder (ADF) 300 includes the paper feeding device according to the above embodiment, and includes, for example, a first conveying path 310, a second conveying path 320, a double feed path 330, and a paper cassette 340, wherein the first conveying path 310 communicates with the paper cassette 340, and both ends of the second conveying path 320 and the double feed path 330 communicate with the first conveying path 310 and the paper discharging device 350, respectively. The Automatic Document Feeder (ADF) 300 further includes a scanner section (not shown) provided in the conveying path, and performs scanning processing on an image on the conveyed sheet.
FIG. 7 shows a flow diagram of the operation of a paper supply apparatus according to one embodiment of the invention, wherein the operation of the paper supply apparatus includes the steps of:
step S11 is executed to start.
Step S13 is performed to input the sheet thickness in order to adjust the wind force of the suction fan according to the sheet thickness.
Step S15 is executed to transmit a paper feed command, and the pair of conveyance rollers starts rotating in the forward direction.
Step S17 is executed to open the separating section when the leading end of the sheet in the first conveying direction passes through the last pair of conveying roller pairs of the first conveying path.
Step S19 is executed, and the detection unit detects whether or not there is a sheet in the double feed path.
If the detection section detects that there is no paper in the double feed path, it indicates that there is no paper double feed, and step S17 is executed.
If the detecting part detects that the paper exists in the double feed path, the paper double feed is generated, step S21 is executed, when the paper enters the double feed path, the separating part is closed, the conveying roller pairs in the first conveying path and the double feed path are controlled to rotate reversely, and the paper is conveyed along the second conveying direction. Specifically, when the rear end of the uppermost sheet in the first sheet conveying direction leaves the first conveying path, the separating section is closed, the conveying roller pairs in the first conveying path and the double conveying path are controlled to rotate in opposite directions, and the sheet is conveyed in the second conveying direction.
Step S23 is executed to start the separating unit when the sheet enters the first conveying path, control the pair of conveying rollers in the first conveying path and the double conveying path to rotate in the forward direction, and convey the sheet in the first conveying direction. Specifically, when the rear end of the sheet in the second conveyance direction reaches the last conveying roller pair in the first conveyance path (the conveying roller pair closest to the second conveyance path in the first conveyance path), the separating section is opened, and the conveying roller pairs in the first conveyance path and the double conveyance path are controlled to rotate in the forward direction, so that the sheet is conveyed in the first conveyance direction.
Then, the process continues to step S19, and the detection section detects whether or not there is paper in the double feed path.
According to the paper feeding device of the embodiment of the invention, when the double feeding condition occurs to the conveyed paper, the control part can control the separation of the topmost paper from other paper, the first paper enters the second conveying path, and other paper enters the double feeding path; when the detection part detects that the paper enters the double feed path, the detection part conveys other paper entering the double feed path back to the first conveying path, and then conveys the other paper again along the first conveying path, so that the problem of paper double feed can be effectively solved.
While the technical content and the technical features of the invention have been disclosed, it is understood that various changes and modifications of the disclosed concept can be made by those skilled in the art within the spirit of the invention, and the invention is not limited thereto. The above description of embodiments is intended to be illustrative, and not restrictive, and the scope of the invention is defined by the appended claims.

Claims (8)

1. A sheet feeding apparatus, comprising: a first conveying path, a second conveying path, a third conveying path, a double conveying path, and a plurality of conveying roller pairs located in the respective paths, wherein the second conveying path and the double conveying path are respectively communicated between the first conveying path and the third conveying path, the double conveying path is located below the second conveying path, and a junction is formed at a communication position of the first conveying path, the second conveying path, and the double conveying path;
wherein the paper feeding device further includes:
a separation section located above the intersection section;
a detection section, located in the re-feeding path and adjacent to the intersection, for detecting whether there is a sheet passing through the re-feeding path; and
a control section for controlling conveyance of the paper in each path;
wherein the control section is configured to:
the control part opens the separating part to separate the paper conveyed in the first conveying path, if the number of the paper conveyed in the first conveying path is 1, the paper is conveyed to the second conveying path and then conveyed to the third conveying path, if the number of the paper conveyed in the first conveying path is more than 1, the first paper positioned at the top is separated from other paper, the first paper enters the second conveying path, and other paper enters the re-conveying path;
when the detection portion detects that the number of sheets in the double feed path is 1, the control portion controls the sheets entering the double feed path to be conveyed to the third conveyance path;
when the detecting portion detects that the number of sheets in the double feed path is greater than 1, the control portion closes the separating portion after the first sheet passes through the first conveyance path, and controls the conveyance roller pairs in the first conveyance path and the double feed path to rotate in opposite directions so as to convey the sheet in the double feed path back to the first conveyance path.
2. The paper feeding apparatus of claim 1, wherein the control portion is further configured to:
after the paper in the double feed path is conveyed back to the first conveyance path, the control unit opens the separation unit and controls the conveyance roller pairs in the first conveyance path and the double feed path to rotate in the forward direction so as to continue conveying the paper in the first conveyance path.
3. The paper feeding apparatus of claim 2, wherein the control portion is further configured to:
in the process of conveying the paper in the double feed path to the third conveying path, when the paper in the double feed path is conveyed to the outlet of the double feed path, detecting whether the rear end of the paper conveyed in the second conveying path in the first paper conveying direction enters the third conveying path, and if the paper enters the third conveying path, continuing to convey the paper in the double feed path; and if the paper sheet does not enter the third conveying path, temporarily stopping conveying the paper sheet in the double conveying path.
4. The sheet feeding apparatus as claimed in any of claims 1 to 3, wherein the separating portion is a suction fan, and the air volume of the suction fan is adjustable according to the weight or size of the sheet to be conveyed.
5. A sheet feeding apparatus according to any one of claims 1 to 3, wherein the first conveyance path is provided with a first conveying roller pair, the second conveyance path is provided with a second conveying roller pair, the first conveying roller pair and the second conveying roller pair are respectively adjacent to the intersection, and the first sheet passing through the first conveyance path is: the rear end of the first sheet conveyed in the first conveying direction in the first conveying path is separated from the first conveying roller pair or the front end of the first sheet conveyed in the first conveying direction in the first conveying path passes through the second conveying roller pair.
6. The sheet feeding apparatus as claimed in any one of claims 1 to 3, wherein a second detecting portion for detecting whether the number of sheets is greater than 1 is provided in the second conveyance path, and when the second detecting portion detects that the number of sheets in the second conveyance path is greater than 1, the control portion controls the pair of conveyance rollers in the second conveyance path to rotate in reverse so as to convey the sheet back to the first conveyance path.
7. An image forming apparatus, comprising:
the sheet supply device as claimed in any one of claims 1 to 6, for supplying and carrying sheets; and
an image forming section for forming an image on a sheet.
8. An automatic document feeder, comprising:
the sheet supply device as claimed in any one of claims 1 to 6, for supplying and carrying sheets; and
and a scanning unit for scanning the transported paper.
CN201911027804.XA 2019-10-25 2019-10-25 Sheet feeder, image forming apparatus, and automatic document feeder Active CN112707195B (en)

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