Sheet feeding apparatus
阅读说明:本技术 片材给送装置 (Sheet feeding apparatus ) 是由 松村宏一 大熊聪 于 2020-03-11 设计创作,主要内容包括:本发明提供一种片材给送装置。该装置包括:用于放置在片材放置部上的片材的宽度检测器;用于在片材被逐张地分离的同时传送片材的传送器;在多个第一位置处用于具有第一宽度的片材的第一检测器;在多个第二位置处用于未被第一片材检测器检测到的具有第二宽度的片材的第二检测器;以及控制器,其用于在片材的宽度是第一宽度的情况下,基于由第一检测器进行的对片材的检测的结果确定片材的偏斜,并且在片材的宽度是第二宽度的情况下,基于由第二检测器进行的检测的结果确定片材的偏斜。(The invention provides a sheet feeding apparatus. The device includes: a width detector for a sheet placed on the sheet placing section; a conveyor for conveying the sheets while the sheets are separated one by one; a first detector for a sheet having a first width at a plurality of first locations; a second detector for a sheet having a second width not detected by the first sheet detector at a plurality of second positions; and a controller for determining a skew of the sheet based on a result of detection of the sheet by the first detector in a case where the width of the sheet is a first width, and determining the skew of the sheet based on a result of detection by the second detector in a case where the width of the sheet is a second width.)
1. A sheet feeding apparatus comprising:
a width detection unit for detecting a width of the sheet placed on the sheet placing portion;
a conveying unit for conveying the sheets placed on the sheet placing portion while separating the sheets one by one;
a first sheet detecting unit for detecting the sheet having the first width conveyed by the conveying unit at a plurality of first positions different from each other in a width direction perpendicular to the conveying direction;
a second sheet detecting unit for detecting the sheet having the second width, which is conveyed by the conveying unit and is not detected by the first sheet detecting unit, at a plurality of second positions different from each other in the width direction; and
a control unit for determining the skew of the sheet based on a result of the detection by the first sheet detecting unit in a case where the width of the sheet detected by the width detecting unit is a first width, and determining the skew of the sheet based on a result of the detection by the second sheet detecting unit in a case where the width of the sheet detected by the width detecting unit is a second width.
2. The sheet feeding device according to claim 1,
wherein the plurality of first positions are two first positions and the plurality of second positions are two second positions, and
the plurality of second positions are included between the plurality of first positions in the width direction.
3. The sheet feeding device according to claim 1,
wherein, in a case where the width of the sheet detected by the width detection unit is the first width, the control unit determines the skew of the sheet based on a result of the detection by the second sheet detection unit in addition to a result of the detection by the first sheet detection unit.
4. The sheet feeding apparatus according to claim 3,
wherein, in a case where the width of the sheet detected by the width detection unit is the first width, the control unit performs determination of the skew of the sheet based on a result of the detection performed by the first sheet detection unit and determination of the skew of the sheet based on a result of the detection performed by the second sheet detection unit in parallel.
5. The sheet feeding device according to claim 1,
wherein the plurality of first positions are two first positions, the plurality of second positions are two second positions, and
the control unit determines the sheet skew in a case where the sheet is not detected at one of the two positions before a predetermined time elapses after the sheet is detected at the other of the two positions by each of the first sheet detecting unit and the second sheet detecting unit.
6. The sheet feeding device according to claim 5,
wherein the control unit determines the skew of the sheet using a value larger than a value of the predetermined time used by the first sheet detecting unit as the predetermined time used by the second sheet detecting unit.
7. The sheet feeding device according to claim 1,
wherein the first sheet detecting unit includes a first sensor for detecting the sheet at one of the plurality of first positions and a second sensor for detecting the sheet at another one of the plurality of first positions,
the second sheet detecting unit includes a third sensor for detecting the sheet at one of the plurality of second positions and a fourth sensor for detecting the sheet at another one of the plurality of second positions, and
the control unit:
in a case where the width of the sheet detected by the width detection unit is a first width and the second sensor does not detect the sheet before a first time elapses after the first sensor detects the sheet, it is determined that the sheet is skewed, and
in a case where the width of the sheet detected by the width detection unit is the second width and the fourth sensor does not detect the sheet before the second time elapses after the third sensor detects the sheet, the sheet skew is determined.
8. The sheet feeding device according to claim 1,
wherein the plurality of first positions are the same position in the conveying direction, and
the plurality of second positions are the same position in the conveying direction.
9. The sheet feeding device according to claim 1,
wherein the plurality of first locations are arranged downstream of the plurality of second locations in the conveying direction.
10. The sheet feeding device according to claim 1, further comprising:
a setting unit configured to set a setting for mixed sheet placement for placing sheets having a plurality of different widths on the sheet placement section,
wherein the control unit disables the determination of the sheet skew in a case where the setting for mixed sheet placement is configured.
11. The sheet feeding device according to claim 10, further comprising:
a unit for detecting a sheet placed on the sheet placing portion; and
a storage unit for storing settings of mixed sheet placement in a case where sheets are placed on the sheet placement section;
wherein, in a case where the sheet placed on the sheet placing section is detected, the control unit disables or does not disable the determination of the sheet skew depending on the setting of the mixed sheet placement stored in the storage unit.
12. The sheet feeding device according to claim 11, further comprising:
a unit enabling the user to log in,
wherein a setting of mixed sheet placement in a case where sheets are placed in the sheet placing section is stored in the storage unit in association with a user, and
in the case where a sheet placed in the sheet placing section is detected, the control unit disables or does not disable the determination of the sheet skew depending on the setting of the mixed sheet placing stored in the storage unit in association with the login user.
13. The sheet feeding device according to claim 1,
wherein, in a case where the control unit determines that the sheet is skewed, the control unit causes the conveying unit to stop conveying the sheet.
14. A sheet feeding apparatus comprising:
a width detection unit for detecting a width of the sheet placed in the sheet placing portion;
a conveying unit for conveying the sheets placed on the sheet placing portion while separating the sheets one by one;
a first sheet detecting unit for detecting the sheet having the first width conveyed by the conveying unit at a plurality of first positions different from each other in a width direction perpendicular to the conveying direction;
a second sheet detecting unit for detecting the sheet having the second width, which is conveyed by the conveying unit and is not detected by the first sheet detecting unit, at a plurality of second positions different from each other in the width direction; and
a control unit configured to cause the conveying unit to stop conveying the sheet based on a result of the detection by the first sheet detecting unit in a case where the width of the sheet detected by the width detecting unit is a first width, and to stop conveying the sheet based on a result of the detection by the second sheet detecting unit in a case where the width of the sheet detected by the width detecting unit is a second width.
15. The sheet feeding device according to claim 14,
wherein the first sheet detecting unit includes a first sensor for detecting the sheet at one of the plurality of first positions and a second sensor for detecting the sheet at another one of the plurality of first positions,
the second sheet detecting unit includes a third sensor for detecting the sheet at one of the plurality of second positions and a fourth sensor for detecting the sheet at another one of the plurality of second positions, and
the control unit:
stopping the conveying unit from conveying the sheet in a case where the width of the sheet detected by the width detecting unit is a first width and the second sensor does not detect the sheet before a first time elapses after the first sensor detects the sheet; and is
In a case where the width of the sheet detected by the width detection unit is the second width and the fourth sensor does not detect the sheet before the second time elapses after the third sensor detects the sheet, the conveyance unit is caused to stop conveying the sheet.
Technical Field
The present invention relates to a sheet feeding apparatus for feeding an original.
Background
Conventionally, there is known an image reader device which is arranged in an upper portion of an image forming apparatus and reads an image in an original. The image reader apparatus has an ADF (automatic document feeder) for feeding originals set on an original tray while separating the originals one by one. The ADF cannot separate and feed so-called bound originals such as a bound original and a pasted original, and if the original to be conveyed is a bound original, the original may be wrinkled or torn in a mechanism for separating the ADF of the original. In addition, if the bound original is fed as it is without being separated in the ADF, there is a fear that a paper jam occurs on the conveying path.
When the bound original is fed by the ADF, only the uppermost sheet of the bound original is picked up by a pickup roller provided in the ADF and fed to the conveying path. However, the uppermost sheet is bound by a staple or the like, and is thus rotated and deflected around the binding position. A technique of stopping feeding an original upon detection of an original skew is known (japanese patent laid-open No. 2012-101900). Further, there is proposed an image reader apparatus in which a plurality of original detection sensors are arranged in the width direction of an original conveying path, a skew of a conveyed sheet is detected by these original detection sensors, and a jam caused by binding of an original is determined (japanese patent laid-open No. 2012 and 101900, japanese patent laid-open No. 2006 and 193287).
With the technique in japanese patent laid-open No. 2012-101900, the skew of the original different in size in the width direction cannot be accurately detected. That is, in order to improve the detection accuracy, it is effective to increase the distance in the width direction between the two sensors for detecting a skew. However, if the distance between the sensors increases, the small-sized original cannot be detected.
In japanese patent laid-open No. 2006-193287, a plurality of, i.e., three or more sheet detection sensors are arranged in a line. A plurality of skew angles are obtained for the plurality of detection portions based on a time difference when the leading end of the sheet passes through two paper detection sensors in each detection portion and a distance between the two paper detection sensors arranged. Japanese patent laid-open publication No. 2006-193287 also does not consider processing originals having different width sizes.
Disclosure of Invention
The present invention provides a sheet feeding apparatus capable of accurately detecting a plurality of bound originals having different sizes.
The present invention has the following configuration. That is, according to a first aspect of the present invention, there is provided a sheet feeding apparatus comprising: a width detection unit for detecting a width of the sheet placed on the sheet placing portion; a conveying unit for conveying the sheets placed on the sheet placing portion while separating the sheets one by one; a first sheet detecting unit for detecting the sheet having the first width conveyed by the conveying unit at a plurality of first positions different from each other in a width direction perpendicular to the conveying direction; a second sheet detecting unit for detecting the sheet having the second width, which is conveyed by the conveying unit and is not detected by the first sheet detecting unit, at a plurality of second positions different from each other in the width direction; a control unit for determining the skew of the sheet based on a result of the detection by the first sheet detecting unit in a case where the width of the sheet detected by the width detecting unit is a first width, and determining the skew of the sheet based on a result of the detection by the second sheet detecting unit in a case where the width of the sheet detected by the width detecting unit is a second width.
According to a second aspect of the present invention, there is provided a sheet feeding apparatus comprising: a width detection unit for detecting a width of the sheet placed in the sheet placing portion; a conveying unit for conveying the sheets placed on the sheet placing portion while separating the sheets one by one; a first sheet detecting unit for detecting the sheet having the first width conveyed by the conveying unit at a plurality of first positions different from each other in a width direction perpendicular to the conveying direction; a second sheet detecting unit for detecting the sheet having the second width, which is conveyed by the conveying unit and is not detected by the first sheet detecting unit, at a plurality of second positions different from each other in the width direction; and a control unit configured to cause the conveying unit to stop conveying the sheet based on a result of the detection by the first sheet detecting unit in a case where the width of the sheet detected by the width detecting unit is a first width, and to stop conveying the sheet based on a result of the detection by the second sheet detecting unit in a case where the width of the sheet detected by the width detecting unit is a second width.
According to the present invention, feeding of a plurality of bound originals having different sizes can be accurately detected.
Further features of the invention will become apparent from the following description of exemplary embodiments (with reference to the attached drawings).
Drawings
Fig. 1A is an overall schematic diagram illustrating an image forming apparatus.
Fig. 1B is a schematic diagram of an image forming engine.
Fig. 2 is a schematic diagram of a skew detecting section according to the first embodiment.
Fig. 3 is a control block diagram according to the first embodiment.
Fig. 4 is a flowchart showing the operation according to the first embodiment.
Fig. 5 is a flowchart of the S11-S12 skew detection process according to the first embodiment.
Fig. 6A shows a state before feeding the bound original.
Fig. 6B shows a state after the bound original has entered the separation driving roller.
Fig. 7A shows the ideal skew.
Fig. 7B shows the actual skew.
Fig. 7C shows the actual deflection over time.
Fig. 8 is a flowchart showing an operation according to the second embodiment.
Fig. 9 is a flowchart showing the operation according to the third embodiment.
Fig. 10 illustrates an operation of an automatic document feeding section of an image forming apparatus according to a fourth embodiment.
Fig. 11 is a flowchart illustrating a process performed by the image forming apparatus according to the fourth embodiment.
Fig. 12 shows an appearance of an operation portion of an image forming apparatus according to a fifth embodiment.
Fig. 13 is a flowchart illustrating a process performed by the image forming apparatus according to the fifth embodiment.
Detailed Description
Hereinafter, embodiments will be described in detail with reference to the accompanying drawings. Note that the following examples are not intended to limit the scope of the claimed invention. A plurality of features are described in the embodiments, but not limiting the invention requires all such features, and a plurality of such features may be combined as appropriate. Further, in the drawings, the same reference numerals are given to the same or similar configurations, and the repetitive description thereof is omitted.
First embodiment
First, a first embodiment of the present invention will be described. The image forming apparatus 100 according to the first embodiment is, for example, a multifunction machine or a multifunction copier having an image scanner and a printer and having an electrophotographic laser beam printer as the printer. Fig. 1A is an overall schematic diagram of the image forming apparatus 100, and fig. 1B is a schematic diagram of an image forming engine. As shown in fig. 1A, the image forming apparatus 100 includes an image forming apparatus main body 70 and an image reader device 10 attached to an upper portion of the image forming apparatus main body 70. Note that in the following description, the "sheet" may include not only plain paper but also special paper such as coated paper, recording material having a special shape (e.g., envelope or index paper), plastic film for a projector, cloth, and the like, and an original is also an example of the sheet. In addition, a paper feeding apparatus for receiving the print sheets placed thereon and a post-processing apparatus for performing post-processing such as stapling may also be provided, but are omitted here. The original may be referred to as an original.
The image forming apparatus main body 70 includes an
In parallel with this image forming operation, an operation of feeding a sheet set in a sheet feeding cassette or a manual feed tray provided in a sheet feeding apparatus (not shown) to the
The image forming apparatus 100 further includes a
Image reader apparatus
Construction of the image reader device 10
Next, the image reader device 10 will be described in detail. As shown in fig. 1A, the image reader device 10 includes a sheet feeding unit (automatic document feeder; also referred to as "ADF") 20 for feeding set originals one by one, and a reader unit (also referred to as "original reader unit") 40 for reading originals conveyed by the ADF 20. The ADF20 serving as a sheet feeding apparatus is rotatably supported with respect to the reader unit 40 by a hinge so that an original glass 41 of the reader unit is exposed. Note that the originals D (each of which is an example of a sheet) may be white paper, or may be paper on which images are formed on one or both sides thereof.
The ADF20 has an
The reader unit 40 has: a platen glass 28 located at a position where the original conveyed by the ADF20 is to be read; and a jumping base 29 for guiding the original having passed through the platen glass 28 toward the conveying path. The reader unit 40 also has a reference white plate 42 for shading correction, and an original glass 41 on which an original is placed in a fixed original reading mode. A first mirror base 43, a second mirror base 44, a lens 45 and a CCD line sensor 46 are provided. The lamp 47 and the reflecting mirror 48 are disposed in the first mirror base 43, and the reflecting mirrors 49 and 50 are disposed in the second mirror base 44. The first mirror base 43 and the second mirror base 44 can be moved in the sub-scanning direction (left-right direction in the drawing) by a wire and a drive motor (not shown).
The image reader device 10 reads image information from an original D using a flow original reading mode in which an image in the original is scanned while the original D set on an
-reading the original in each reading mode
When the flowing original reading mode is executed, the
The leading end and the trailing end of the original that has passed through the separation nip N are detected by the post-separation sensor S32, and serve as references for the timing of raising and lowering the
The original D to be conveyed is conveyed by the conveying roller pair 25, and is conveyed toward the platen glass 28 by the guide roller pair 26. The platen guide roller 27 is placed opposite to the platen glass 28, and the platen guide roller 27 guides the original D passing through the platen glass 28 so that the original D does not escape upward from the platen glass 28.
Then, the image on the surface of the original D is read by the reader unit 40 via the platen glass 28. Specifically, the conveyed original D is irradiated with light emitted from the lamp 47, and the light reflected from the original D is guided to the lens 45 via the mirrors 48, 49, and 50. The light having passed through the lens 45 forms an image on the light receiving section of the CCD line sensor 46, then undergoes photoelectric conversion and AD conversion, and is sent as image data to the control section 80, specifically, the
On the other hand, if the apparatus detects an original D placed on the original glass 41, or if the user explicitly gives an instruction through the
The two modes are different from each other in whether the original or the light source is moved, but in both modes, for example, raster image data is generated by scanning an original image.
Deflection detection mechanism
Fig. 2 shows a skew detecting mechanism according to a first embodiment. Note that although the skew detecting mechanism according to the first embodiment is constituted by two sensor pairs, this is not necessarily so. The skew detecting mechanism is constituted by a pair of skew detecting sensors S11-S12 and a pair of skew detecting sensors S21-S22. The pair of skew detection sensors S11-S12 is disposed downstream of the
Control frame
Fig. 3 is a block diagram of the control unit 80. Skew detection sensors S11, S12, S21, and S22, a document detection sensor S31, a post-separation sensor S32, and a document width determination section (also simply referred to as a width determination section or a width detection section) 508, each serving as an input signal source, are connected to the
Bound original document detection flow
Next, a copy operation performed when feeding the bound original will be described according to a flowchart. Fig. 4 is a flowchart illustrating a copy operation according to the first embodiment performed when a document is fed.
First, the
If it is determined that an original is set on the original tray 21 (step S101: YES), the
If the original size is smaller than A4R (step S104: YES), a skew detecting process is performed on S11-S12 by the skew detecting sensor (step S105). Step S105 will be described later with reference to fig. 5. If the original size is greater than or equal to A4R (step S104: NO), skew detection processing is performed on S21-S22 by the skew detection sensor (step S106). Step S106 will be described later. After the process in step S105 or step S106 is completed, it is determined whether a skew is detected in step S105 or step S106 (step S107). If skew is detected in step S105 or step S106 (step S107: YES), the
Therefore, the skew is determined based on the result of the pair of skew detection sensors corresponding to the original size of the detected original.
Step S105: S11-S12 skew detection processing
The aforementioned step S105 will be described according to a flowchart: S11-S12 skew detection processing. Fig. 5 is a flowchart showing the S11-S12 skew detection process according to the first embodiment. A detailed description will be given with reference to fig. 6A and 6B. Fig. 6A and 6B illustrate a skew occurring when feeding a bound original as viewed from above. Fig. 6A shows a state where the bound original is set. Fig. 6B shows a state in which the bound original is fed and skew occurs. Note that, in this example, the skew detection sensors S21 and S22 are omitted.
As shown in fig. 6A, the first original document D1 and the second original document D2 bound with staples ST are set. When the paper feeding is started and the bound originals D1 and D2 are advanced to the position of the
In fig. 5, first, it is determined whether the skew detecting sensor S11 is ON (ON) (step S201). If it is determined that the skew detecting sensor S11 is not turned on, it is determined whether the skew detecting sensor S12 has been turned on (step S202: YES). If the skew detection sensor S12 is turned on in step S202, the process proceeds to step S203. In step S203, it is determined whether or not the skew detecting sensor S11 is on after the skew detecting sensor S12 has been on in step S202. If it is determined that the skew detecting sensor S11 is off (step S203: no), there is a possibility that the sheet being conveyed is skewed. In this case, if the time difference between the two sensors S11 and S12, at which the sheet is detected, exceeds the threshold value Tth [ ms ], it is determined that the skew has occurred. The time difference indicates the degree of skew of the sheet. It is then determined whether a threshold value (predetermined time) Tth [ ms ] stored in the
If the threshold value Tth [ ms ] has not elapsed in step S204 (step S204: no), the process returns to step S203 to determine whether the skew detection sensor S11 is on. That is, the process loops between steps S203 to S204 until the skew detection sensor S11 turns on or the time Tth elapses. If steps S203 and S204 are repeated and the threshold value Tth [ ms ] elapses (step S204: YES), it is determined that the original being fed has entered the state shown in FIG. 6B. Then, the determination result indicating that skew has occurred is stored in a predetermined storage area or the like (step S205), and the S11-S12 skew detection processing ends.
If the fed original is not a staple original but a normal original, normally, the skew detecting sensor S11 is turned on until the threshold Tth [ ms ] has elapsed in step S204 (step S203: yes), and thus it is determined that the fed original passes through the post-separation sensor S32 (step S208). When the fed original passes through the post-separation sensor S32 (step S208: yes), a determination result indicating that the original being conveyed is not skewed is stored in a predetermined storage area or the like (step S209), and the S11-S12 skew detection process ends.
On the other hand, if it is determined in step S201 that the skew detecting sensor S11 has been turned on, the process branches to step S206 to determine whether the skew detecting sensor S12 has been turned on. If it is determined in step S206 that the skew detecting sensor S12 is off, there is a possibility that the sheet being conveyed is skewed. Then, it is determined whether the threshold value Tth [ ms ] has elapsed before the sensor S12 detects the sheet after the sensor S11 detects the sheet (step S207).
If the threshold value Tth [ ms ] has not elapsed in step S207 (step S207: no), the process returns to step S206 to determine whether the skew detection sensor S12 is on. That is, the process loops between steps S206 and S207 until the skew detection sensor S12 turns on or the time Tth elapses. If steps S206 and S207 are repeated and the threshold value Tth [ ms ] elapses (step S207: YES), it is determined that the original being fed has entered a state which is the reverse of the state shown in FIG. 6B. Then, the determination result indicating that skew has occurred is stored in a predetermined storage area or the like (step S205), and the S11-S12 skew detection processing ends.
If the fed original is not a bound original but a normal original, the process branches to step S208. The processing to be performed thereafter is as described above.
Step S106: S21-S22 skew detection processing
This process is the process in fig. 5 in which the skew detection sensors S11 and S12 are replaced with S21 and S22. In this example, the threshold value Tth may take the same value as that used in the procedure of fig. 5. The other portions are also the same as those in fig. 5, and therefore, the description thereof will be omitted.
Configurations of the skew detecting sensor pair S11-S12 and the skew detecting sensor pair S21-S22
Having described the detection method using the pairs of skew detection sensors S11-S12 and S21-S22 so far, now, the reason why two or more pairs of skew detection sensors S11-S12 and S21-S22 are required will be described below. Fig. 7A to 7C show an example of a skew state when a bound original of a3 size is fed. Fig. 7A shows a skew which does not cause a distortion of the sheet leading edge and is ideal for detection, fig. 7B shows a state in which skew has started to occur and the sheet leading edge has been bent and actually often occurs, and fig. 7C shows a state in a case where conveyance is continued from the state of fig. 7B. The pair of skew detecting sensors S11-S12, the pair of skew detecting sensors S21-S22, the
Second embodiment
Next, a second embodiment of the present invention will be described. In the second embodiment, the image forming apparatus basically has the same configuration as that of the first embodiment, but its operation flowchart is different. In this embodiment, a drawing and a description are given of differences from the first embodiment. Fig. 8 is a flowchart of processing relating to detection of a bound original according to the present embodiment, which is performed by the
In the flowchart according to the second embodiment of fig. 8, steps S301 to S304 of determining the original size are the same as steps S101 to S104 in the first embodiment, and thus the description thereof is omitted. If it is determined in step S304 that the original size is smaller than A4R (step S304: yes), in step S306, the detection threshold Tth is set to Tth1 stored in the
However, since the distance between the skew detection sensors S21 and S22 is larger than the distance between the skew detection sensors S11 and S12, it is desirable to make the threshold value Tth2 larger than the threshold value Tth 1. The threshold value Tth2 is defined as Tth1 (distance between S21 and S22/distance between S11 and S12), and the threshold value Tth in the first embodiment may be replaced with this value. This is to match the inclination of the leading edge (from which the skew is determined to occur) in the case of the process of fig. 5. Needless to say, since the sheet being conveyed often twists as described with reference to fig. 7B and 7C, the threshold value Tth2 may also be set accordingly.
After the threshold Tth1 has been set in step S305, the process advances to step S306 to perform S11-S12 skew detection processing. The S11-S12 skew detection processing herein is the same as the S11-S12 skew detection processing in step S105 in the first embodiment except that the detection threshold value Tth is changed to Tth1, and thus the description thereof is omitted. After the detection threshold value Tth is set to Tth2 stored in the
After the process of step S307 or step S308 is completed, it is determined whether a skew is detected in step S307 or step S308 (step S309). The subsequent processing is the same as that in steps S108 and S109 in the first embodiment, and thus the description thereof is omitted.
Through the above-described procedure, the threshold value for determining the skew is changed according to the distance between the sensors constituting each skew detection sensor pair (sensor pair), and therefore, the skew can be detected more accurately.
Third embodiment
Next, a third embodiment of the present invention will be described. The basic configuration of the third embodiment is the same as that of the second embodiment, but the operational flowchart thereof is different. In this embodiment, a drawing and a description are given of differences from the second embodiment. Fig. 9 is a flowchart relating to detection of a bound original according to the present embodiment. Fig. 9 differs from fig. 8, which is a flowchart of the second embodiment, in that in fig. 9, steps S408a and S408b are performed instead of step S308 in fig. 8. The other steps are the same as those in the second embodiment, and thus the description thereof is omitted.
After setting the detection threshold value Tth to Tth2 stored in the
For this reason, if a skew is detected in step S408a or step S408b, other steps may be stopped, and the process may proceed to step S409. Note that, for example, a real-time operating system that controls the image forming apparatus 100 will generally have the capability of performing tasks in parallel, and thus can perform tasks under its control.
The above configuration and processing make it possible to detect the skew of the original faster. This embodiment is particularly effective in the case of a large-sized original.
Fourth embodiment
If an attempt is made to process mixed originals having different widths in the above-described embodiment using two pairs of sensors, the following problem arises. "mixed originals having different widths" refers to a state in which originals having different sizes in the width direction are stacked on the
The present embodiment adopts the configuration described below. Note that the image forming apparatus 100 according to the present embodiment may be the same as that of the first embodiment.
Skew detection and mixed originals having different widths
Fig. 10 schematically illustrates the operation of the ADF20 according to this embodiment. The skew detection operation by the ADF20 will be described below with reference to fig. 10. Fig. 10 is a plan view of the
Fig. 10 shows hybrid originals having different width sizes that are placed on and conveyed by the ADF 20. Operations performed for mixed originals having different widths will be described based on fig. 10. Here, a document D1 and A3 document D2, which are horizontally placed a4 documents, are placed on the
In fig. 10, the regulating
In fig. 10, the small-size original D1 is conveyed in a mode of reading a mixed original having different widths. At this time, the original D1 is conveyed to the left side of the figure only by the
Operation part
First, the
Skew detection process
Fig. 11 is a flowchart illustrating processing performed by the control section 80 of the image forming apparatus 100 according to the present embodiment when reading an original. The steps in the flowchart of fig. 11 are processed by the
First, the control section 80 (specifically, the CPU 81) determines whether the user has given an instruction to start a job accompanying reading of an original, such as a copy job or a scan job (S601). Specifically, while a screen for configuring settings for copying or scanning is displayed on the
If it is determined in step S601 that an instruction to start execution of a job such as a copy job or a scan job has been given, it is determined whether an original is set on the
If it is determined that the original is set in the
If it is determined in step S603 that the set value for placing mixed originals having different widths is ON, the set value for original skew detection is set to OFF (OFF) (S604). This setting may be performed in any manner, such as a method in which the ADF20 ignores original detection information from the skew detection sensors S12 to S21 so as not to perform skew detection processing by itself, or a method in which the control section 80 ignores a skew detection notification acquired from the reader unit 40. If it is determined in step S603 that the set value for placing the mixed originals having different widths is not ON, the set value for original skew detection is set to ON (S606). Therefore, document skew detection by the ADF20 can be enabled.
After step S604 or S606, the ADF20 performs document reading processing in the streaming document reading mode (S605).
On the other hand, if it is determined in step S602 that the original is not set in the
Therefore, if the setting of setting mixed originals having different widths is set to ON, that is, when a plurality of originals having different width sizes are read and these originals are to be read by the ADF20, skew detection itself can be automatically disabled to prevent the above-described erroneous detection of skew. In addition, if the setting of placing mixed originals having different widths is set to OFF and an original is to be read by the ADF20, skew detection is automatically enabled. Therefore, the user does not need to enable or disable the skew detection function according to the setting for placing the mixed original, and if skew detection can be used without considering the use condition or the like, skew detection can always be used. Therefore, when reading an original, the operability of the user is improved.
Fifth embodiment
The hardware configuration and the control block configuration according to the fifth embodiment are the same as those described in the first embodiment, and therefore the description thereof is omitted. The fifth embodiment will describe a method for controlling setting values employed when setting default setting values for placing mixed originals having different widths in the image forming apparatus 100 of the administrative user. Note that the fifth embodiment will describe only the differences from the fourth embodiment.
In the fifth embodiment, a user is managed on the image forming apparatus 100. A user name for identifying the user and a password associated therewith are stored in the
Fig. 12 shows an example of a user authentication screen displayed on the display portion 401 of the
When the password input section 703 is pressed, a software keyboard dialog is similarly displayed so that a password can be similarly input. If the set password contains only numbers, the software keyboard dialog box will not be displayed, and the password may be directly entered using the ten-key 403. After the password is input, a symbol such as "×", instead of the character in the password input section 703, is displayed, and thus it can be understood that the password has been input.
The login button 704 is a button for authenticating the user after the user name and password have been entered. After the login button 704 is pressed, it is checked whether the input user name and password match a pair of the user name and password stored in the
Skew detection process
Fig. 13 is a flowchart illustrating processing performed by the control section 80 when reading an original in the fifth embodiment. The steps in the flowchart of fig. 13 are processed by the
First, the control section 80 (specifically, the CPU 81) determines whether the user has logged in by authentication (S801). Specifically, it is determined whether the login button 704 in the authentication dialog 701 has been pressed, and whether the user name and password match in the user authentication performed after it is determined that the login button 704 has been pressed. If it is determined that the user has not logged in, step S801 is repeated to wait for a user instruction. Note that if authentication is performed by another device, the name of a logged-in user or the like stored in a predetermined storage location is referred to, and if a user name is stored, it can be determined that the user has logged in.
If it is determined in step S801 that the user has logged in, the setting values for the logged-in user are read out from the
Next, it is determined whether or not an original is set on the
Further, it is determined whether a set value for placing mixed originals having different widths among the configured default settings of the placement of mixed originals is ON (S805). This processing is the same as that in step S603 of fig. 11 in the fourth embodiment.
If it is determined in step S805 that the setting value for placing mixed originals having different widths is ON, the skew detection setting is off (S806). On the other hand, if the set value for placing mixed originals having different widths is OFF, the skew detection setting is on (S809). The processing in these steps is the same as the processing in steps S604 and S606 of fig. 11 in the fourth embodiment, respectively.
After the processing in step S806 or step S809, it is determined whether the user has given an instruction to start executing a job such as a copy job or a scan job (S807). This processing is the same as the processing in step S601 of fig. 11 in the fourth embodiment. If it is determined in step S807 that no user instruction is given, the process returns to step S803 to wait for a user instruction. If it is determined in step S807 that the user instruction has been given, processing for reading the original in the streaming original reading mode is performed (S808). This processing is the same as that in step S605 of fig. 11 in the fourth embodiment.
If it is determined in step S803 that no document is set, the default setting of the mixed document of the currently registered user is cleared in the setting values stored for the user (S810). Therefore, if no original is set, the setting of the mixed original is configured such that the setting value including the setting for setting the mixed originals having different widths is set to OFF, with respect to the setting of the mixed original. Next, it is determined whether the user has given an instruction to start executing a job such as a copy job or a scan job (S811). This step is the same as step S808 and step S601 of fig. 11 in the fourth embodiment described above. If it is determined in step S811 that no user instruction is given, the process returns to step S803 to wait for a user instruction. If it is determined in step S811 that the user instruction has been given, processing for reading the original in the fixed original reading mode is performed (S812). This processing is the same as that in step S607 of fig. 11 in the fourth embodiment.
As described above, even if the user is managed and the setting value of the user is automatically reflected at the time of user login, it is possible to change two setting values without inconsistency, which may cause a malfunction such as placing of mixed originals having different widths and skew detection setting in the case of setting the two setting values at the same time. Therefore, the user can use the two functions after login without paying special attention to the two setting values, and convenience and operability are improved.
Other embodiments
In the above-described embodiment, the pair of skew detecting sensors S21-S22 is disposed downstream of the pair of skew detecting sensors S11-S12, but the pair of skew detecting sensors S11-S12 may alternatively be disposed on the downstream side, or both pairs of sensors may be disposed at the same position in the conveying direction.
The embodiment(s) of the present invention may also be implemented by: a computer of a system or apparatus that reads and executes computer-executable instructions (e.g., one or more programs) recorded on a storage medium (which may also be referred to more fully as a "non-transitory computer-readable storage medium") to perform the functions of one or more of the above-described embodiment(s), and/or that includes one or more circuits (e.g., an application-specific integrated circuit (ASIC)) for performing the functions of one or more of the above-described embodiment(s); and computer-implemented methods by the system or apparatus, e.g., reading and executing computer-executable instructions from a storage medium to perform the functions of one or more of the above-described embodiment(s) and/or controlling the one or more circuits to perform the functions of one or more of the above-described embodiment(s). The computer may include one or more processors (e.g., a Central Processing Unit (CPU), Micro Processing Unit (MPU)) and may include a separate computer or a network of separate processors to read out and execute the computer-executable instructions. The computer-executable instructions may be provided to the computer, for example, from a network or a storage medium. E.g. storageThe medium may include one or more of the following: a hard disk, Random Access Memory (RAM), read-only memory (ROM), memory of a distributed computing system, an optical disk (e.g., a Compact Disk (CD), a Digital Versatile Disk (DVD), or a Blu-ray disk (BD)TM) Flash memory devices, memory cards, and the like.
The embodiments of the present invention can also be realized by a method in which software (programs) that perform the functions of the above-described embodiments are supplied to a system or an apparatus through a network or various storage media, and a computer or a Central Processing Unit (CPU), a Micro Processing Unit (MPU) of the system or the apparatus reads out and executes the methods of the programs.
While the present invention has been described with respect to the exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. The scope of the following claims is to be accorded the broadest interpretation so as to encompass all such modifications and equivalent structures and functions.
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