JP2013078063A - Automatic document transport device and network multifunction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an automatic document transport device having an energy saving mode in which a power consumption can be suppressed as much as possible.SOLUTION: There is provided the automatic document transport device which operates in a normal mode and the energy-saving mode, the automatic document transport device including a main body part, a cover which forms a transport path for document together with the main body part when closed and exposes the transport path when opened, a first detection part and a second detection part which detect at least one of the states that a document is at a transport start position of the transport path and the cover is opened, and a power supply control part which powers on the first detection part and the second detection part in the normal mode, and powers on the first detection part and powers off the second detection part in the energy-saving mode. The power control part changes the mode from the energy-saving mode to the normal mode when at least one of the states that the document is at the transport start position and the cover is opened occurs.

Description

  The present invention relates to an automatic document feeder that performs operations in a normal mode and an energy saving mode that consumes less power than the normal mode.

  There is an automatic document feeder that conveys one or more documents to a scanner one by one and reads the documents one by one in the scanner. Some automatic document feeders include a normal mode and an energy saving mode that consumes less power than the normal mode.

  For example, the automatic document feeder of Patent Document 1 includes document detection sensors of two different types of operation principles that detect that a document is placed at a predetermined position. One is to transmit light through a hole opened at a predetermined position, and when the original is placed at a predetermined position, the original is detected by detecting light reflected from the original placed above the hole. An original platen original detection sensor for detecting the presence or absence of a document. The other is a paper feed unit original detection sensor that detects the presence or absence of an original by detecting that the interruption of the light of the photo interrupter by the lever is released by the original while the original is placed. In Patent Document 1, when the original platen document detection sensor detects that there is a document, the mode shifts from the energy saving mode to the normal mode, and then the paper feed unit document detection sensor does not detect the presence of another document. Immediate transition to energy saving mode. This minimizes the transition from the energy-saving mode to the normal mode due to erroneous detection by immediately shifting to the energy-saving mode even if there is a false detection of the platen original detection sensor due to the intensity of ambient light being detected. ing.

JP 2004-295037 A

  Such an automatic document feeder is provided with a cover that can expose the document conveyance path by opening the cover so that a paper jam or the like can be eliminated when a document jam occurs in the document conveyance path. ing. The automatic document feeder is also provided with a cover open / close detection sensor that detects the open / closed state of the cover so that the user can be notified that the cover has been opened / closed. Therefore, even in the energy saving mode, it is necessary to display an error in order to notify the user when the cover open / close detection sensor is turned on and it is detected that the cover is open. Further, when the document is placed at a predetermined position as in Patent Document 1, it is only necessary to detect that the document is placed without the user performing an operation for returning to the normal mode. There is a need to return to normal mode. That is, in the energy saving mode, it is necessary to turn on the power of at least two sensors, that is, a sensor that detects a document and a sensor that detects the open / closed state of the cover. However, in the energy saving mode, it is preferable to reduce the number of sensors to be energized as much as possible in order to reduce power consumption.

  Accordingly, the present invention has been made in view of such a situation, and an object thereof is to provide an automatic document feeder having an energy saving mode capable of suppressing power consumption as much as possible.

  In order to achieve the above object, an automatic document feeder according to an embodiment of the present invention is an automatic document feeder that operates in a normal mode and an energy saving mode that consumes less power than the normal mode. A cover for forming a document transport path together with the main body in the closed state and exposing the transport path in the open state, the document being at a transport start position of the transport path, and the cover. A first detection unit that detects at least one of the open state, a second detection unit that detects the open / closed state of the cover, and the first detection unit and the second detection unit in the normal mode A power control unit that turns on the power of the first detection unit in the energy saving mode and turns off the power of the second detection unit. Is the conveyance path And that of the transport start position, said cover when that at least one of the possible in the open state has occurred is detected by the first detection section, the transition from the power saving mode to the normal mode.

  According to this, the first detection unit detects that at least one of the document at the conveyance start position on the conveyance path and the cover being open has occurred. For this reason, even when the second detection unit is not activated, it can be detected that the cover is closed and the document is not at the conveyance start position.

  To shift from the normal mode to the energy saving mode, both the cover is in a closed state and the document is not at the conveyance start position are essential. This is because, in the former case, when the cover is in an open state, it is necessary to display an error indicating that the cover is in an open state to the user. In the latter case, when the cover is closed and the document is at the conveyance start position, it is necessary to turn on the scanner by determining that the user has started an operation to start reading the document. That is, when both the former and latter conditions are satisfied, the mode can be shifted to the energy saving mode for the first time, and if the condition can be determined by one sensor, the other sensors can be turned off in the energy saving state.

  In other words, in the present invention, since the first detection unit can determine that both the cover is in the closed state and that the document is not in the conveyance start position, the opening and closing of the cover is detected in the energy saving mode. The power supply of the second detection unit can be turned off. Thereby, since the power supply of the 2nd detection part which detects the opening / closing state of a cover separately from a 1st detection part can be turned off in an energy saving mode, the power consumption in an energy saving mode can be reduced more.

  The power supply control unit further includes a document transport unit that transports a document and a scanner unit that scans the document transported by the document transport unit, and the power control unit further shifts from the normal mode to the energy saving mode. In the case where the document conveying unit and the scanner unit are turned off and the energy saving mode is shifted to the normal mode, and the cover is detected to be closed by the second detection unit. It is preferable to turn on the power of the document conveying section and the scanner section.

  According to this, when returning from the energy saving mode to the normal mode, it is confirmed whether or not the cover is in the closed state by the second detection unit. When the second detection unit detects that the cover is in the closed state, the power of the document transport unit and the scanner unit is turned on to prepare for reading the document.

  As described above, since the first detection unit detects that at least one of the document at the conveyance start position on the conveyance path and the cover is open, the cover is simply opened. In some cases, it is detected that the mode has been changed to the normal mode. If the cover is in the closed state, the first detection unit detects that at least one of the document is at the transport start position on the transport path and the cover is in the open state. In this case, it is detected that the document is at the conveyance start position on the conveyance path. In other words, when the first detection unit moves to the normal mode from the energy saving mode, the power supply control unit confirms from the second detection unit that the cover is in the closed state, so that the document is in the conveyance path. It can be determined that it is at the transfer start position.

  As described above, after confirming that the cover is closed and the document is at the transport start position on the transport path, the power of the document transport unit and the scanner unit for reading the document is turned on. In other words, when the mode is changed from the energy saving mode to the normal mode, if it is detected that the cover is in the open state, the power source control unit controls the power of the document conveying unit and the scanner unit with the power off. It is possible to reduce wasteful consumption.

  The first detection unit is disposed in the cover, and is disposed in the main body unit, the claw unit being movable to a predetermined position only when the cover is in a closed state, and the claw unit is disposed in the predetermined position. A photo sensor for detecting the presence of the document, a document detecting claw portion movable by rotating between a first position and a second position, and the cover being in a closed state, When the detection claw portion rotates and moves to the first position, the claw portion rotates and moves to the predetermined position, and the document detection claw portion moves from the first position to the second position. A rotation transmission shaft that rotates and moves the claw portion to a position different from the predetermined position when the claw portion rotates and moves to a position side, and the cover is closed in the document detection claw portion In the case where the document is not arranged at the transport start position, the first Located in position, when the cover is closed, I'll be forced to located the document to the transport start position, it is preferable to move from said first position to a position other than the first position.

  The first detection unit is disposed in the cover, and is disposed in the main body unit, the claw unit being movable to a predetermined position only when the cover is in a closed state, and the claw unit is disposed in the predetermined position. The claw portion is located at the predetermined position when the cover is in a closed state and no document is placed at the conveyance start position. Further, when the cover is in a closed state, the cover is pushed out by the document placed at the conveyance start position, so that the cover moves from the predetermined position to a position different from the predetermined position.

  The first detection unit is disposed on the cover, and is disposed on the cover, a claw that is movable by rotating between a predetermined position and a position different from the predetermined position, A photosensor that detects that the claw portion is at the predetermined position, a rotation detection claw portion that is movable by rotating between a first position and a second position, and the rotation detection claw The claw portion is rotated and moved to the predetermined position when the portion is rotated and moved to the first position, and the rotation detection claw portion is moved from the first position to the second position side. A rotation transmission shaft that rotates and moves the claw portion to a position different from the predetermined position when moved by rotation, and the rotation detection claw portion is provided when the cover is in an open state. It is located at a position other than the first position, and the cover is in a closed state, When the document is not placed at the start position, the first position is located at the first position, and when the cover is closed, the first position is pushed out by the document placed at the transport start position. It can also be set as the form which moves to positions other than said 1st position from this position.

  The first detection unit is disposed on the cover, and is disposed on the cover, a claw that is movable by rotating between a predetermined position and a position different from the predetermined position, A photosensor that detects that the claw portion is at the predetermined position, and the claw portion is located at a position different from the predetermined position when the cover is in an open state. In the closed state, when the document is not placed at the transport start position, it is positioned at the predetermined position, and when the cover is closed, it is pushed out to the document placed at the transport start position. Therefore, it may be configured to move from the predetermined position to a position different from the predetermined position.

  In addition, the present invention can be realized as a network complex machine incorporating such an automatic document feeder.

  According to the automatic document feeder according to the present invention, the power consumption in the energy saving mode can be further reduced.

1 is a perspective view of a network multifunction peripheral according to an embodiment. 1 is a perspective view of an automatic document feeder. FIG. 3 is a perspective view of the automatic document feeder with a cover opened. It is a schematic block diagram of a document detection sensor and a cover open / close detection sensor. It is a figure which shows the principle of operation of a document detection sensor. FIG. 6 is a functional block diagram relating to a return process from the energy saving mode to the normal mode of the automatic document feeder. 6 is a flowchart showing a flow of normal mode return processing of the automatic document feeder. (A) is a time chart showing the control state of power on and off to each sensor when the cover is opened, and (b) is each sensor when the cover is closed and there is a document. It is a time chart which shows the state of the control of the power supply ON and OFF to. It is a schematic block diagram of the original document detection sensor and cover opening / closing detection sensor in a modification (1). It is a figure which shows the operating principle of the original document detection sensor in a modification (1). (A) is a figure which shows the rotation detection part in the open state of the cover in a modification (2), (b) is a sensor nail | claw part in the open state in the modification (2), and a document detection photosensor. FIG. (A) is a figure which shows the rotation detection part when the cover in a modification (2) is in a closed state and there is no document, and (b) is a cover in the modification (2) in a closed state and there is no document. It is a figure which shows the nail | claw part for sensors in this case, and the photo sensor for original detection. (A) is a figure which shows the rotation detection part when the cover in a modification (2) is in a closed state and there is a document, and (b) is a cover in a modification (2) in a closed state and there is a document. It is a figure which shows the nail | claw part and photosensor in the case of. It is a figure which shows the original document detection sensor in the open state in the cover in a modification (3). It is a figure which shows the original document detection sensor in case the cover in a modification (3) is closed and there is no original document. It is a figure which shows the original document detection sensor in case the cover in a modification (3) is a closed state and there exists a document.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a perspective view of a network multifunction peripheral including an automatic document feeder according to the present embodiment. FIG. 2 is a perspective view of the automatic document feeder. FIG. 3 is a perspective view showing a state where the cover of the automatic document feeder is opened.

  As shown in FIG. 1, an automatic document feeder (ADF) 100 is installed at the top of the network multifunction peripheral 1 and scans a document to be copied or a document to be transmitted by a scanner unit 62. It is a device that automatically conveys the image to the image reading position (see later). As shown in FIG. 2 and FIG. 3, the automatic document feeder 100 has a cover 11, a paper feed tray 12 on which a document before reading is placed, and a document after reading is discharged. A paper discharge tray 13 and a main body 14 that forms a transport path 70 together with the cover 11 are provided. Note that the two directions in the transport path 70 are the X direction, the direction perpendicular to the X direction on the paper feed tray 12 is the Y direction, and the height direction that is perpendicular to the X direction and the Y direction is the Z direction. . The automatic document feeder 100 operates in at least two modes: a normal mode and an energy saving mode that consumes less power than the normal mode.

  The cover 11 forms a document conveyance path 70 together with the main body portion 14 in the closed state, and exposes the conveyance path 70 in the open state. When the cover 11 is in the closed state, the cover 11 is supported by a front side cover support part 15 and a back side cover support part 16 provided on the front side and the back side of the main body part 14. On the back side of the cover 11, a document detection unit 30 for detecting a document and a cover detection claw unit 35 for detecting opening and closing of the cover 11 are provided.

  The document detection unit 30 includes a sensor claw portion 31, a rotation transmission shaft 32, a document detection claw portion 33, and a rotation shaft fixing portion 34. Here, FIG. 4 is a schematic configuration diagram of the document detection sensor 21 and the cover open / close detection sensor 22. The document detection sensor 21 (first detection unit) includes a document detection unit 30 and a document detection photosensor 51. As shown in FIG. 4, the sensor claw portion 31 of the document detection unit 30 is provided on the back cover support portion 16 when the cover 11 is changed from the open state (the broken line state in FIG. 4). It is located in the first sensing area 81 of the document detection photosensor 51 inside the first hole 41. The document detection photosensor 51 is a so-called photointerrupter including a light emitting unit that emits light and a light receiving unit that receives light emitted from the light emitting unit. The document detection photosensor 51 determines that there is an object in the first sensing area 81 when the light receiving unit detects that the light from the light emitting unit is blocked. That is, here, the document detection photosensor 51 detects whether or not the sensor claw portion 31 is in the first sensing region 81. If the original detection photosensor 51 detects that there is an object in the first sensing area 81, the detection signal becomes “High”, and if it detects that there is no object in the first sensing area 81, the detection signal Becomes “Low”. The relationship between “High” and “Low” of the detection signal detected by the document detection photosensor 51 and the presence of an object in the first sensing area 81 may be reversed.

  The cover open / close detection sensor 22 (second detection unit) includes a cover detection claw portion 35 and a cover open / close detection photosensor 52. As shown in FIG. 4, the cover detection claw portion 35 has a second hole 42 provided in the back cover support portion 16 when the cover 11 is closed from the open state (the broken line state in FIG. 4). In the second sensing region 82 of the cover open / close detection photosensor 52. The cover open / close detection photosensor 52 has the same configuration as the document detection photosensor 51, and an object is present in the second sensing region 82 when the light receiving unit detects that the light from the light emitting unit is blocked. Judge that. That is, here, the cover open / close detection photosensor 52 detects whether or not the cover detection claw portion 35 is in the second sensing region 82. Thereby, it is detected whether the cover 11 is in an open state or a closed state. If the cover open / close detection photosensor 52 detects that there is an object in the second sensing area 82, the detection signal becomes “High”, and if it detects that there is no object in the second sensing area 82, the detection is performed. The signal becomes “Low”. The relationship between “High” and “Low” detection signals detected by the cover open / close detection photosensor 52 and the presence of an object in the first sensing region 81 may be reversed.

  FIG. 5 is a diagram illustrating the operating principle of the document detection sensor 21. As described above, the document detection sensor 21 includes the sensor claw portion 31, the rotation transmission shaft 32, the document detection claw portion 33, the rotation shaft fixing portion 34, and the document detection photosensor 51.

  The sensor claw portion 31 can move to the first sensing region 81 of the document detection photosensor 51 only when the cover 11 is in the closed state. That is, when the cover 11 is in the open state, the sensor claw portion 31 cannot move to the first sensing region 81. As shown in FIG. 5, the document detection claw portion 33 is movable by rotating between a first position (a broken line position in FIG. 5) and a second position (a solid line position in FIG. 5). Structure. The rotation transmission shaft 32 is configured such that when the cover 11 is in the closed state and the document detection claw 33 is rotated and moved to the first position, the sensor claw 31 is moved to the first position of the document detection photosensor 51. One sensing area 81 is rotated and moved. When the document detection claw 33 is pushed out by the document and rotated from the first position to the second position, the sensor claw 31 is rotated to a position different from the first sensing area 81. And move it. As shown in FIG. 3, the rotation shaft fixing portion 34 is a member for fixing the rotation transmission shaft 32 to the cover 11 and functions as a bearing portion of the rotation transmission shaft 32. That is, when the cover 11 is in the closed state, the document detection sensor 21 is in the closed state because the sensor claw portion 31 is located in the first sensing area 81 when the document is not at the conveyance start position 90. When the document is not at the conveyance start position 90, “High” is set. Further, when the cover 11 is in the closed state, the position where the sensor claw 31 is removed from the first sensing area 81 in conjunction with the document detection claw 33 being pushed out to the document when the document is set. At this time, it becomes “Low”. That is, the document detection sensor 21 can detect the open / closed state of the cover 11 when the document is not at the conveyance start position 90.

  FIG. 6 is a block diagram relating to the return processing from the energy saving mode to the normal mode of the automatic document feeder.

  The automatic document feeder 100 includes a power control unit 101, a document detection sensor 21, a cover open / close detection sensor 22, a reading detection sensor 23, a reverse detection sensor 24, a document width detection sensor 25, and a document transport unit 61. And a scanner unit 62.

  The power control unit 101 is a control unit that controls on / off of power of various sensors and various devices. In the normal mode, the power control unit 101 supplies power to the document detection sensor 21, the cover open / close detection sensor 22, the reading detection sensor 23, the reverse detection sensor 24, the document width detection sensor 25, the document transport unit 61, and the scanner unit 62. turn on. However, the power supply control unit 101 does not turn on the power of the document conveyance unit 61 and the scanner unit 62 immediately after shifting from the energy saving mode to the normal mode. Control of this point will be described later. The power supply control unit 101 also turns on the power of the document detection sensor 21 in the energy saving mode, the cover open / close detection sensor 22, the reading detection sensor 23, the reverse detection sensor 24, the document width detection sensor 25, the document transport unit 61, and The power of the scanner unit 62 is turned off. The power supply control unit 101 saves energy when the document detection sensor 21 detects that at least one of the document at the conveyance start position 90 of the conveyance path 70 and the cover is open. Transition from mode to normal mode. That is, the power supply control unit 101 shifts from the energy saving mode to the normal mode when no object is detected in the first sensing area 81 of the document detection photosensor 51 of the document detection sensor 21. The power supply control unit 101 switches the power of the document conveyance unit 61 and the scanner unit 62 when the cover 11 is detected to be closed by the cover open / close detection sensor 22 when the energy saving mode is shifted to the normal mode. turn on.

  The description of the document detection sensor 21 and the cover open / close detection sensor 22 is the same as described above, and will be omitted.

  The reading detection sensor 23 is a sensor that detects whether or not the document has reached the reading position of the scanner unit 62. The reversal detection sensor 24 determines whether or not the document has reached a reversal position, which is a position where the X direction changes during the period from the paper feed tray 12 through the conveyance path 70 to the paper discharge tray 13 below. It is a sensor which detects. The document width detection sensor 25 is a sensor that detects the width of the document in the Y direction.

  The document transport unit 61 includes a roller (not shown) for transporting a document that is disposed between the transport start position 90 of the paper feed tray 12 and the paper discharge tray 13 through the transport path 70. It comprises a motor (not shown) for driving the roller.

  The scanner unit 62 includes an image sensor for scanning a document and an optical system such as a lens that guides an image of the document to the image sensor.

  Next, a processing procedure of normal mode return processing in the present embodiment configured as described above will be described.

  FIG. 7 is a flowchart showing the flow of normal mode return processing of the automatic document feeder. FIG. 8A is a time chart showing a control state of power ON / OFF to each sensor when the cover is opened, and FIG. 8B is a state where the cover is closed and a document is present. It is a time chart which shows the state of control of the power supply ON and OFF to each sensor in the case.

  As shown in FIG. 7, when the network multifunction peripheral 1 is not operated for a predetermined time (for example, 10 minutes), the normal mode is shifted to the energy saving mode. Specifically, when shifting to the energy saving mode, the power supply control unit 101 turns on the power of the document detection sensor 21, turns off the power of the other sensors 22 to 25 including the cover open / close detection sensor 22, and transports the document. The power of the unit 61 and the scanner unit 62 is turned off (S101). With reference to FIG. 8, power control of the sensors 21 to 25 and the devices 61 and 62 will be described. As shown in FIGS. 8A and 8B, the power other than the document detection sensor 21 is turned off at the first timing T1 when the mode is shifted to the energy saving mode.

  Next, the power supply control unit 101 causes the document detection sensor 21 to cause at least one of the document at the conveyance start position 90 of the conveyance path 70 and the cover 11 to be open (hereinafter, “ It is confirmed whether or not a detection state is detected (S102). In other words, the power supply control unit 101 starts from the state where the sensor claw portion 31 is positioned in the first sensing region 81 of the document detection photosensor 51 of the document detection sensor 21, so that the sensor claw portion 31 is located outside the first sensing region 81. Check if the position has changed to the position.

  When the document detection sensor 21 is in a detection state (S102: Yes), the power control unit 101 turns on the power of the cover open / close detection sensor 22 and the various sensors 23 to 25 (S103). At this time, as shown in FIGS. 8A and 8B, the document detection sensor 21 becomes “Low” at the second timing T2. In this case, the power of the cover open / close detection sensor 22 is turned on at a third timing T3 after the second timing T2. The power supply control unit 101 repeats step S102 when the document detection sensor 21 is not in the detection state (S102: No).

  The power supply control unit 101 confirms whether or not the cover opening / closing detection sensor 22 detects that the cover 11 is open (S104). In other words, the power supply control unit 101 confirms whether or not the cover detection claw portion 35 is located in the second sensing region 82 of the cover open / close detection photosensor 52 of the cover open / close detection sensor 22.

  When the cover open / close detection sensor 22 detects that the cover 11 is in the open state (S104: Yes), the power control unit 101 displays a display unit (not shown) to notify the user that the cover 11 is in the open state. An error message “open cover” is displayed (not shown) (S105). At this time, as shown in FIG. 8A, the cover opening / closing detection sensor 22 becomes “Low” at the fourth timing T4. In this case, the power of the document transport unit 61 and the scanner unit 62 remains off after the fourth timing T4.

  When the cover open / close detection sensor 22 detects that the cover 11 is in the closed state (S104: No), the power supply control unit 101 checks whether there is an error display of “cover open” (S106). ).

  When there is an error display of “cover open” (S106: Yes), the power supply control unit 101 cancels the error display of “cover open” on the display unit (S107).

  When there is no error display of “open cover” (S106: No), or after step S107, the power supply control unit 101 turns on the power of the document conveyance unit 61 and the scanner unit 62 (S108). At this time, as shown in FIG. 8B, the cover open / close detection sensor 22 becomes “Low” at the fourth timing T4. In this case, at the fifth timing T5 after the fourth timing T4, the power of the document conveying section 61 and the scanner section 62 is turned on.

  In step S108, since it is confirmed that the cover 11 is in the closed state and the document is placed at the transport start position 90 of the document transport path 70, the power control unit 101 determines that the user It is determined that a document is placed to start reading. Then, it automatically returns to the normal mode from the energy saving mode by automatically judging the user's action, and starts preparation for reading the document by the scanner.

  As described above, according to the automatic document feeder 100 of the present embodiment, at least one of the document at the conveyance start position 90 of the conveyance path 70 and the cover 11 being in the open state has occurred. Is detected by a document detection sensor 21 as a first detection unit. For this reason, even if the cover open / close detection sensor 22 as the second detection unit is not activated, it is detected that the cover 11 is in the closed state and the document is not in the conveyance start position 90. can do.

  By the way, in order to shift from the normal mode to the energy saving mode, both that the cover 11 is in the closed state and that the document is not at the conveyance start position 90 are essential. This is because, in the former case, when the cover 11 is in the open state, it is necessary to perform an error display indicating that the cover 11 is in the open state to the user. In the latter case, when the cover 11 is in the closed state and the document is at the conveyance start position 90, it is determined that the user has started an operation for starting reading of the document, and the scanner (various sensors 23 to 25, document conveyance unit 61). This is because the power of the scanner unit 62) needs to be turned on. That is, when both the former and latter conditions are satisfied, the mode can be shifted to the energy saving mode for the first time, and if the condition can be determined by one sensor, the other sensors 23 to 25 are turned off in the energy saving state. Can do.

  In the automatic document feeder 100 according to the present embodiment, the document detection sensor 21 can determine that both the cover 11 is closed and the document is not at the conveyance start position 90. For this reason, the power supply control part 101 can turn off the power supply of the cover opening / closing detection sensor 22 which detects opening / closing of the cover 11 in energy saving mode. As a result, the power supply of the cover open / close detection sensor 22 that detects the open / close state of the cover 11 can be turned off in the energy saving mode separately from the document detection sensor 21, so that the power consumption in the energy saving mode can be further reduced.

  Also, according to the automatic document feeder 100 of the present embodiment, when the energy saving mode returns to the normal mode, the cover 11 is checked by the cover open / close detection sensor 22 to determine whether or not the cover 11 is closed. Then, when the cover open / close detection sensor 22 detects that the cover 11 is in the closed state, the document transport unit 61 and the scanner unit 62 are turned on, and a document reading preparation is performed.

  The document detection sensor 21 detects that at least one of the document at the conveyance start position 90 of the conveyance path 70 and the cover 11 is in an open state, so that the cover 11 is simply opened. In some cases, it is detected that the operation has been performed, and the normal mode is entered. This will be described below only when the cover 11 is in the closed state. When the detection signal of the document detection sensor 21 is “Low”, it is detected that the document is at the transport start position 90 of the transport path 70. The case where the detection signal of the document detection sensor 21 is “Low” means that at least one of the document is at the conveyance start position 90 of the conveyance path 70 and the cover 11 is open. This is a case where the document detection sensor 21 detects. That is, when the document detection sensor 21 is operated to shift from the energy saving mode to the normal mode, the power supply control unit 101 confirms from the cover open / close detection sensor 22 that the cover 11 is closed, thereby conveying the document. It can be determined that the current position is at the conveyance start position 90 of the path 70.

  As described above, the power supply control unit 101 confirms that the cover 11 is in the closed state and the document is at the transport start position 90 of the transport path 70, and then the document transport unit 61 and the scanner unit for reading the document. Turn on 62. That is, when the cover opening / closing detection sensor 22 detects that the cover 11 is open when the energy saving mode is shifted to the normal mode, the power supply control unit 101 turns off the power of the document conveyance unit 61 and the scanner unit 62. Since control is performed as it is, wasteful consumption of power consumption can be reduced.

(Modification)
The information processing apparatus according to the present invention has been described based on the embodiment, but the present invention is not limited to this embodiment.

  That is, the embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

(1)
In the automatic document feeder 100 according to the above-described embodiment, the document detection unit 30 constituting the document detection sensor 21 has a document detection claw unit 33 pushed out by the document and a sensor claw that directly acts on the document detection photosensor 51. The part 31 is separated. However, it is not limited to this form, and may be an integrated type.

  FIG. 9 is a schematic configuration diagram of the document detection sensor and the cover open / close detection sensor in the modified example (1). When the cover 11 is in the closed state, the claw portion 131 attached to the cover 11 changes from the broken line state in FIG. 9 to the solid line state. As described above, the claw portion 131 is fixed to the cover 11 with the rotation shaft 141 as an axis, and hangs downward from the rotation shaft 141 regardless of the open / closed state of the cover 11. When the cover 11 is in the closed state, the cover 11 is located in the first sensing region 181 (predetermined position) of the document detection photosensor 151 (photosensor). Thus, the document detection sensor 121 that can detect the open / closed state of the cover 11 when the document is not at the conveyance start position 90 may be used.

  FIG. 10 is a diagram showing the operation principle of the document detection sensor in the modification (1). As shown in FIG. 10, the claw portion 131 is the first sensing region 181 of the document detection photosensor 151 when the cover 11 is in the closed state and the document is not placed at the conveyance start position 90. (The state of the broken line in FIG. 10). When the cover 11 is in the closed state, the claw portion 131 is pushed out to the document placed at the conveyance start position 90, thereby separating the first sensing region 181 from the first sensing region 181 of the document detection photosensor 151. Move to the position. In this case, document detection photosensor 151 differs from document detection photosensor 51 in the above embodiment in order to use both a member for determining the presence of a document and a member acting on the photosensor. The document is placed immediately below the conveyance start position 90 where the document is placed.

(2)
In the automatic document feeder 100 of the above embodiment, the document detection photosensor 51 constituting the document detection sensor 21 is disposed on the main body 14 side, but is not limited thereto, and is disposed on the cover 11. Also good.

  11A is a diagram illustrating the rotation detection unit 233 when the cover 211 in the modification (2) is open, and FIG. 11B is a sensor claw 231 when the cover is open in the modification (2). It is a figure which shows the (nail | claw part) and the photo sensor 251 (photo sensor) for original detection. FIG. 11B is a diagram illustrating the rotation detection unit when the cover in the modified example (2) is in a closed state and there is no document, and FIG. 11B is a diagram in which the cover in the modified example (2) is in a closed state. It is a figure which shows the nail | claw part for a sensor in case there is no original and a photo sensor for original detection. FIG. 11C is a diagram illustrating the rotation detection unit when the cover in the modified example (2) is in a closed state and there is a document, and FIG. 11B is a diagram in which the cover in the modified example (2) is in a closed state. It is a figure which shows a nail | claw part and a photosensor in case there exists a document. In FIGS. 11A, 11B, and 11C, (a) and (b) are diagrams in which positions in the Y direction are different, and in particular, the positions of the rotational transmission shaft 232 in the X direction and the Z direction are the same.

  As shown in FIGS. 11A, 11B, and 11C, the cover 211 has a first space 401 and a second space 402 at different positions in the Y direction. The document detection photosensor 251 has the same configuration as the document detection photosensor 51 of the above embodiment.

  A case where the cover 211 is in the open state will be described with reference to FIG. 11A. As shown in FIG. 11A (a), in the first space 401, the rotation detector 233 rotates around the rotation transmission shaft 232 and hangs downward. At this time, the rotation detection unit 233 is accommodated in the first space 401. On the other hand, as shown in FIG. 11A (b), the sensor claw portion 231 is located at a position different from the first sensing region 281 of the document detection photosensor 251.

  A case where the cover 211 is closed and the document is not at the conveyance start position 90 will be described with reference to FIG. 11B. As shown in FIG. 11B (a), when the cover 211 is in a closed state and is in a horizontal state, the rotation detection unit 233 rotates about the rotation transmission shaft 232 and hangs downward. At this time, a part of the rotation detection unit 233 comes out below the first space 401. On the other hand, as shown in FIG. 11B (b), the sensor claw portion 231 rotates when the rotation of the rotation detector 233 is transmitted by the rotation transmission shaft 232, and the first sensing area of the document detection photosensor 251 is detected. Move to 281. Thereby, the document detection sensor 221 can detect that the cover 211 is closed.

  A case where the cover 211 is closed and the document is inserted into the conveyance start position 90 will be described with reference to FIG. 11C. As shown in FIG. 11C (a), when the document is inserted into the conveyance start position 90 with the rotation detection unit 233 hanging downward and coming out below the first space 401, the rotation detection unit 233 starts conveyance. By being pushed out to the document placed at the position 90, the broken line state is changed to the solid line state. At this time, the sensor claw portion 231 rotates when the rotation of the rotation detection unit 233 is transmitted by the rotation transmission shaft 232, and positions other than the first sensing region 281 from the first sensing region 281 of the document detection photosensor 251. Move to.

  As described above, even with the configuration of the document detection sensor 221, the same effect as that of the document detection sensor 21 of the above embodiment can be obtained.

(3)
In the modification (2), the rotation detection unit 233 pushed out by the document and the sensor claw unit 231 that directly acts on the document detection photosensor 251 are separated. It may be an integral type.

  FIG. 12A is a diagram illustrating the document detection sensor 321 when the cover 311 in the modified example (3) is open. FIG. 12B is a diagram illustrating the document detection sensor 321 when the cover 311 in the modified example (3) is in the closed state and there is no document. FIG. 12C is a diagram illustrating the document detection sensor 321 when the cover 311 in the modified example (3) is in a closed state and a document is present.

  As shown in FIGS. 12A, 12B, and 12C, the cover 311 has a third space 403. The document detection sensor 221 includes an L-shaped claw portion 331 and a document detection photosensor 351. The claw portion 331 includes a document detection claw portion 341 extending along the Z direction, a sensor claw portion 342, and a rotation shaft 343. The document detection claw portion 341 and the sensor claw portion 342 are integrated with each other at the rotation shaft 343 and have an L-shape. The document detection photosensor 351 has the same configuration as the document detection photosensor 51 of the above embodiment.

  A case where the cover 311 is in an open state will be described with reference to FIG. 12A. As shown in FIG. 12A, in the third space 403, the claw portion 331 rotates around the rotation shaft 343, the document detection claw portion 341 hangs downward, and the sensor claw portion 342 includes the document detection photosensor 351. The first sensing region 381 is located at a different position.

  A case where the cover 311 is closed and the document is not at the conveyance start position 90 will be described with reference to FIG. 12B. As shown in FIG. 12B, when the cover 311 is in a closed state and is in a horizontal state, the document detection claw portion 341 rotates about the rotation shaft 343 and hangs downward. At this time, a part of the document detection claw portion 341 protrudes below the third space 403. On the other hand, the sensor claw portion 342 also rotates and moves to the first sensing region 381 of the document detection photosensor 351. Thereby, the document detection sensor 321 can detect that the cover 311 is closed.

  A case where the cover 311 is closed and the document is inserted into the conveyance start position 90 will be described with reference to FIG. 12C. As shown in FIG. 12C, when the document is inserted into the conveyance start position 90 with the document detection claw 341 hanging downward and protruding below the first space 401, the document detection claw 341 starts conveyance. By being pushed out to the document placed at the position 90, the broken line state is changed to the solid line state. At this time, the sensor claw portion 342 also rotates together and moves from the first sensing area 381 of the document detection photosensor 351 to a position other than the first sensing area 381.

  As described above, even with the configuration of the document detection sensor 321, the same effect as that of the document detection sensor 21 of the above embodiment can be obtained.

(4)
In the above embodiment, the document detection sensor 21 is used as a sensor for detecting that at least one of the document at the conveyance start position 90 in the conveyance path 70 and the cover 11 being in the open state has occurred. However, it is not limited to this. Instead of the document detection sensor 21, a document width detection sensor 25 having the same configuration as that of the document detection sensor 21 and disposed at a different position in the Y direction may be used.

(5)
In the above embodiment, the power supply control unit 101 turns on the power of the various sensors 23 to 25 together with the cover open / close detection sensor 22 when the document detection sensor 21 is in the detection state in step S102 of the normal mode return process. However, it is not limited to this. The various sensors 23 to 25 may be kept off without being turned on at the third timing T3. In this case, it is preferable that the various sensors 23 to 25 perform the same operation as the power supply of the document conveyance unit 61 and the scanner unit 62. That is, at the fifth timing T5 of step S108, it is confirmed that the cover 11 is in the closed state and the document is placed at the conveyance start position 90 of the document conveyance path 70, and then the power The control unit 101 may turn on the power of the various sensors 23 to 25. As a result, when the user has not confirmed that the document has been placed in order to start reading the document, the sensors 23 to 25 together with the document transport unit 61 and the scanner unit 62 are turned off. Can be left. For this reason, wasteful consumption of power consumption can be further reduced.

(6)
In the above-described embodiment, the power supply control unit 101 is provided in the automatic document feeder 100, but is not limited thereto, and may be provided on the network multifunction peripheral 1 side.

  The present invention can be used as an automatic document feeder having an energy saving mode with lower power consumption.

DESCRIPTION OF SYMBOLS 1 Network multifunction device 11,211,311 Cover 12 Paper feed tray 13 Paper discharge tray 14 Main-body part 15 Front side cover support part 16 Back side cover support part 21,121,221,321 Document detection sensor 22 Cover opening / closing detection sensor 23 Reading Detection sensor 24 Reverse detection sensor 25 Document width detection sensor 30 Document detection unit 31, 231, 342 Sensor claw unit 32, 232 Rotation transmission shaft 33, 341 Document detection claw unit 34 Rotating shaft fixing unit 35 Cover detection claw unit 41 First hole 42 Second hole 51, 151, 251 and 351 Document detection photo sensor 52 Cover open / close detection photo sensor 61 Document transport unit 62 Scanner unit 70 Transport path 81, 181, 281 and 381 First sensing region 82 Second Sensing area 90 Conveyance start position 100 Automatic document feeder 1 DESCRIPTION OF SYMBOLS 1 Power supply control part 131,331 Claw part 141,343 Rotating shaft 233 Rotation detection part 401 1st space 402 2nd space 403 3rd space T1 1st timing T2 2nd timing T3 3rd timing T4 4th timing T5 Fifth timing

Claims (7)

An automatic document feeder that operates in a normal mode and an energy saving mode that consumes less power than the normal mode,
The main body,
A cover that forms a document transport path together with the main body in the closed state and exposes the transport path in the open state;
A first detector that detects at least one of a document being at a transport start position of the transport path and an open state of the cover;
A second detector for detecting an open / closed state of the cover;
In the normal mode, the first detection unit and the second detection unit are turned on, in the energy saving mode, the first detection unit is turned on, and the second detection unit is turned on. A power control unit to turn off, and
The power supply control unit, when the first detection unit detects that at least one of the document is in a conveyance start position of the conveyance path and the cover is in an open state, An automatic document feeder that shifts from the energy saving mode to the normal mode. further,
A document transport section for transporting a document;
A scanner unit that scans the document conveyed by the document conveyance unit,
The power supply control unit further includes:
When transitioning from the normal mode to the energy saving mode, turn off the power of the document conveying unit and the scanner unit,
The power source of the document conveying unit and the scanner unit is turned on when the energy saving mode is shifted to the normal mode and the cover is detected to be closed by the second detection unit. Item 2. The automatic document feeder according to Item 1. The first detector is
A claw portion disposed on the cover and movable to a predetermined position only when the cover is in a closed state;
A photosensor disposed on the main body portion for detecting that the claw portion is in the predetermined position;
A document detecting claw portion movable by rotating between a first position and a second position;
When the cover is in a closed state and the document detection claw is rotated and moved to the first position, the claw is rotated to the predetermined position to move the document detection claw A rotation transmission shaft that rotates and moves the claw portion to a position different from the predetermined position when the claw portion rotates and moves from the first position to the second position side;
The document detection claw portion is
When the cover is in a closed state and no document is placed at the transport start position, the cover is located at the first position,
3. The automatic according to claim 1, wherein when the cover is in a closed state, the cover moves from the first position to a position other than the first position by being pushed out by the document placed at the transport start position. 4. Document transport device. The first detector is
A claw portion disposed on the cover and movable to a predetermined position only when the cover is in a closed state;
A photosensor disposed on the main body portion and detecting that the claw portion is in the predetermined position;
The nail portion is
When the cover is in a closed state and no document is placed at the transport start position, the cover is located at the predetermined position,
3. The automatic according to claim 1, wherein when the cover is in a closed state, the cover moves from the predetermined position to a position different from the predetermined position by being pushed out by the document placed at the conveyance start position. Document transport device. The first detector is
A claw portion disposed on the cover and movable by rotating between a predetermined position and a position different from the predetermined position;
A photosensor disposed on the cover and detecting that the claw is in the predetermined position;
A rotation detecting claw portion movable by rotating between the first position and the second position;
When the rotation detection claw portion rotates and moves to the first position, the claw portion rotates and moves to the predetermined position, and the rotation detection claw portion moves from the first position to the first position. A rotation transmission shaft for rotating and moving the claw portion to a position different from the predetermined position when moved to the second position side,
The rotation detecting claw portion is
When the cover is in an open state, it is located at a position other than the first position,
When the cover is in a closed state and no document is placed at the transport start position, the cover is located at the first position,
3. The apparatus according to claim 1, wherein when the cover is in a closed state, the cover is pushed out by a document placed at the conveyance start position, thereby moving from the position of the first position to a position other than the first position. Automatic document feeder. The first detector is
A claw portion disposed on the cover and movable by rotating between a predetermined position and a position different from the predetermined position;
A photosensor disposed on the cover and detecting that the claw portion is in the predetermined position;
The nail portion is
When the cover is in an open state, the cover is located at a position different from the predetermined position,
When the cover is in a closed state and no document is placed at the transport start position, the cover is located at the predetermined position,
3. The automatic according to claim 1, wherein when the cover is in a closed state, the cover moves from the predetermined position to a position different from the predetermined position by being pushed out by the document placed at the conveyance start position. Document transport device.   A network multifunction device comprising the automatic document feeder according to any one of claims 1 to 6.

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