Document scanning device

Abstract

To provide a document scanner that reduces costs by not incorporating a sensor to detect the open / closed state of the cover, and enables appropriate control in the event of a paper jam. [Solution] To achieve the above objective, a document reading device according to one embodiment of the present invention comprises a pickup roller, a sensor, an operation unit, and a paper feed control unit. The pickup roller pulls out one sheet of paper at a time from a paper tray on which multiple sheets of paper are stacked. The sensor detects the presence or absence of paper. The operation unit receives user input. The paper feed control unit controls the upward drive of the pickup roller based on the detection result of the sensor and the operation instructions from the operation unit.

Description

Technical Field

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[0001] The present invention relates to an original document reading device applicable to paper jams in image forming devices such as those enabling printing and scanning.

Background Art

[0002] Conventionally, in a sheet-through type image reading device, the original documents placed on the original document tray are fed out and conveyed one by one by bringing a pickup roller into contact with the upper surface of the original document, and the image of the original document is read.

[0003] For example, in Patent Document 1, a document conveyance device is disclosed that raises the pickup roller to the standby position when the descent of the pickup roller is detected by a document detection sensor that also serves as a descent detection sensor. Also, in Patent Document 2, when no document is placed on the document placement table, the pickup roller is lowered and then raised by a predetermined distance to position the pickup roller at the initial position, and when a document is placed on the document placement table, a paper feeding device that raises the pickup roller by a predetermined amount is disclosed.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] As in Patent Document 1 and Patent Document 2, even when the pickup roller has fallen onto the original document tray (in a state lower than a predetermined position), it is intended to raise the pickup roller so as not to hinder the setting of the original document.

[0006] Furthermore, as shown in Patent Document 2, there are image forming apparatuses that achieve thinner and lighter designs by not incorporating sensors to detect the open / closed state of the cover that covers the pickup roller and sorting roller. In this case, since the paper feeding section is designed on top of the cover, as in the document feed tray of Patent Document 1, the cover needs to be opened to open and close the DP when a paper jam occurs. Since an actuator is located on the DP cover, when the user opens the cover to clear a paper jam, the sensor detects that a document is set. In other words, there is a problem in that it is not possible to detect whether the cover is closed or not after the paper jam has been resolved. Also, when the cover is closed to remove paper when a jam occurs in the DP, the paper feeding unit lowers, and if paper is fed in that state, problems such as jams occurring or a decrease in the number of sheets that can be fed may occur.

[0007] In view of the above circumstances, the object of the present invention is to provide a document scanning device that reduces costs by not incorporating a sensor to detect the open / closed state of the cover, and enables appropriate control in the event of a paper jam. [Means for solving the problem]

[0008] To achieve the above objective, a document reading device according to one embodiment of the present invention comprises a pickup roller, a sensor, an operating unit, and a paper feed control unit. The pickup roller pulls out the paper one sheet at a time from the paper tray on which multiple sheets of paper are stacked. The sensor detects the presence or absence of the paper. The aforementioned operating unit accepts user input. The paper feed control unit controls the upward drive of the pickup roller based on the detection result of the sensor and the operation instruction from the operation unit. [Effects of the Invention]

[0009] According to the present invention, by not incorporating a sensor to detect the open / closed state of the cover, costs can be reduced and appropriate control can be achieved in the event of a paper jam.

[0010] Furthermore, the effects described herein are not necessarily limited to those described herein, and may include any of the effects described herein. [Brief explanation of the drawing]

[0011] [Figure 1] This figure shows the external appearance of an image forming apparatus. [Figure 2] This is a cross-sectional view showing the configuration of the scanner unit. [Figure 3] This is a perspective view showing the paper feeding section. [Figure 4] This is a cross-sectional view showing the configuration of the scanner unit. [Figure 5] This is a time chart for when there is no manuscript in DP after jam processing. [Figure 6] This is a time chart for when the manuscript is in DP after jamming. [Figure 7] This is a schematic diagram illustrating two states. [Figure 8] This is a block diagram showing the configuration of an image forming apparatus. [Figure 9] This flowchart shows the control process for paper jams by the paper feed control unit. [Figure 10] This flowchart shows the control process for jams when there is a manuscript in the DP (Digital Programming) file. [Modes for carrying out the invention]

[0012] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0013] Figure 1 shows the external appearance of the image forming apparatus 100.

[0014] The image forming apparatus 100 can selectively perform various modes such as copying, facsimile, scanner, and printer. For example, copying includes printing an image read from an original document onto a recording sheet. Also, for example, facsimile includes transmitting an image read from an original document via a public line and printing the received image onto a recording sheet. Also, for example, a scanner includes outputting an image read from an original document to an external information terminal. Also, for example, a printer includes printing an image input from the outside via a network or the like onto a recording sheet.

[0015] In FIG. 1, the image forming apparatus 100 includes a scanner unit 110, an image forming unit 113, and a paper feeding unit 114.

[0016] The scanner unit 110 can read an image of an original document. The scanner unit 110 includes an original document reading unit 10 and an image reading unit 60. For example, the scanner unit 110 may be configured to be able to read an image of an original document in both a sheet-through method, which is a method of moving and reading an original document while the original document reading element (scanner head) is in a stationary state, and a scanner head method, which is a method of moving an original document reading element from below an original document placed on a platen glass to read an image of the original document.

[0017] The original document reading unit (DP) 10 is an ADF (Auto Document Feeder) and has an original document placement table 11 and an original document discharge table 12. The original document reading unit 10 reads an original document placed on the original document placement table 11 and discharges it to the original document discharge table 12. The specific structure of the original document reading unit 10 will be described using FIG. 2. In this embodiment, the original document reading unit 10 corresponds to an original document reading apparatus.

[0018] The image reading unit 60 is positioned above the document reading unit 10 and acquires image data by reading the image of the document placed on the platen glass 61 (see Figure 2). For example, the image reading unit 60 may be equipped with a first document reading element 62 (see Figure 2) that reads the front surface of the document, and the document reading unit 10 may be equipped with a second document reading element 20 (see Figure 2) that reads the back surface of the document, so that both sides of the document can be read in a single pass. Contact image sensors (CIS) or the like may be used for the first document reading element 62 and the second document reading element 20.

[0019] The image forming unit 113 includes an image forming section 113A, a paper feed cassette 113B, a manual feed tray 113C, an output tray 113D, and a sorter 113E. The paper feeding unit 114 also includes a paper feed cassette 114A. The image forming unit 113 forms an image on the recording paper fed from the paper feed cassette 113B, manual feed tray 113C, or paper feed cassette 114A using the image forming section 113A, and then discharges the paper into the output tray 113D or sorter 113E.

[0020] Figure 2 is a cross-sectional view showing the configuration of the scanner unit 110.

[0021] The document reading unit 10 has a document placement table 11 and a side guide plate 11a, on which a stack of documents (not shown) is placed. The side guide plate 11a aligns the stack of documents so that the center of the documents in the width direction substantially coincides with the center of the transport path of the document reading unit 10 in the width direction.

[0022] The document reading unit 10 also has a document set sensor 143 that detects the presence or absence of a document. In this embodiment, the document set sensor 143 detects the presence or absence of a document in the DP and outputs the detection result to the paper feed control unit 130, which will be described later. For example, the document set sensor 143 detects documents near the document tray 11 or the stopper 93, or near the pickup roller 45 (for example, directly below). The configuration and installation location of the document set sensor 143 are not limited, and documents may be detected by any detection method such as light or weight.

[0023] The DP cover 14 is positioned on the upper surface of the transport path 15 that transports documents, including the paper feed section 31, and covers the document in a way that allows it to be opened and closed. For example, the DP cover 14 can be opened and closed by the user to resolve paper jams or other issues. In this embodiment, no sensor is provided to detect the open or closed state of the DP cover 14.

[0024] The document reading unit 10 also includes a paper feeding unit 31, a first transport roller 18, a second transport roller 19, a second document reading element 20, and a paper discharge roller 21. The paper feeding unit 31, the first transport roller 18, the second transport roller 19, the second document reading element 20, and the paper discharge roller 21 are arranged in order from the upstream side in the transport direction.

[0025] The stack of documents placed on the document tray 11 is fed by the paper feed unit 31, with the top document in the stack being sent from the paper feed opening to the transport path. The documents are then transported by the first transport roller 18 and the second transport roller 19. Images of both sides of the documents are read by the first document reading element 62 and the second document reading element 20. The documents are then discharged from the discharge opening by the paper discharge roller 21 and loaded onto the document discharge tray 12.

[0026] Figure 3 is a perspective view showing the paper feeding unit 31.

[0027] As shown in Figures 2 and 3, the paper feeding unit 31 is supported by a paper feed holder 41 and includes a paper feed roller 43 and a pickup roller 45 that feed documents from a stack of documents, and an actuator 47 that is driven by the stack of documents.

[0028] The paper feed holder 41 is a rectangular box-shaped member with an open bottom, and has a pair of side plates and a top plate. The paper feed holder 41 is rotatably supported on the free end of a rotating shaft 51, which is cantilevered to the rear side plate of the transport path. A drive gear 53 is fixed to the fixed end (the end opposite to the free end) of the rotating shaft 51. The drive gear 53 is connected to the output gear of a motor (not shown) via a gear train (not shown), and the motor is configured to rotate in both directions.

[0029] Furthermore, the paper feed holder 41 rotates vertically around the rotating shaft 51, as the free end of the rotating shaft 51 passes through the downstream ends of the pair of side plates of the paper feed holder 41 in the transport direction. A torque limiter (not shown) is provided between one side plate of the paper feed holder 41 and the rotating shaft 51. The torque limiter rotates the paper feed holder 41 together with the rotating shaft 51 when the torque applied to the paper feed holder 41 is below a threshold. On the other hand, when the torque applied to the paper feed holder 41 reaches the threshold, the rotating shaft 51 is made to rotate freely relative to the paper feed holder.

[0030] The paper feed roller 43 is rotatably supported on the free end of the rotating shaft 51 between a pair of side plates of the paper feed holder 41. The paper feed roller 43 and the rotating shaft 51 are connected by a coupling mechanism, and the rotational force of the rotating shaft 51 is transmitted to the paper feed roller 43. The coupling mechanism between the paper feed roller 43 and the rotating shaft 51 is not limited, and any coupling mechanism may be constructed by combining various configurations such as a slider 59, a coupling (not shown), and a transmission gear (not shown).

[0031] The slider 59 is supported by an operating lever 61. The operating lever 61 has a frame 63 that rotatably supports the slider 59, and a rod 65 that supports the frame 63. The rod 65 is supported by a support member 17 so as to be axially movable but not rotatable. The rod 65 is also biased rearward by a coil spring 67.

[0032] The actuator 47 is a component that is driven (rotated) by a stack of documents placed on the document holder 11. For example, the actuator 47 has a rod 71 and an actuator arm 73 or link arm (not shown) that protrudes radially from the rod 71.

[0033] The actuator 47 is positioned behind the paper feed holder 41. The actuator 47 is configured such that the actuator arm 73 hangs below the paper feed holder 41 by a torsion coil spring 79 attached to the rod 71. In the initial position of the actuator 47 (when the pickup roller 45 shown in Figure 2 is not lowered), the actuator arm 73 is pushed by the stack of documents, causing the rod 71 to rotate against the biasing force of the torsion coil spring 79. If there is no stack of documents, the rod 71 is biased by the torsion coil spring 79, causing the actuator 47 to return to its initial position.

[0034] A link lever 81 is positioned between the actuator 47 and the operating lever 61. The link lever 81 converts the rotational motion of the actuator 47 into reciprocating motion along the axial direction of the operating lever 61.

[0035] The link lever 81 is positioned downstream of the actuator 47 in the transport direction and has a rod 83 and a link arm 85 that protrudes radially from the rear end of the rod 83. The rod 83 of the link lever 81 is supported by the support member 17 in a position aligned axially with the rod 65 of the operating lever 61, so as to be rotatable and immovable in the axial direction.

[0036] The pickup roller 45 is positioned between the upstream ends in the transport direction of a pair of side plates of the paper feed holder 41. The rotation shaft of the pickup roller 45 is rotatably supported by the pair of side plates, and a transmission gear (not shown) is fixed to the rotation shaft, which meshes with a transmission gear (not shown) of the rotation shaft 51 via a plurality of idler gears 44 (see Figure 1).

[0037] The paper feed holder 41 is also supported by a pair of stoppers 93 that restrict the position of the leading edge of the document stack. The stoppers 93 are rotatably supported on the outer surfaces of a pair of side plates. The tips of the stoppers 93 hang down below the lower end of the paper feed holder 41. The pair of stoppers 93 become rotatable relative to the paper feed holder 41 when the paper feed holder 41 is rotated to the paper feeding position, thereby allowing the documents to be fed out. When the paper feed holder 41 is rotated to the non-paper feeding position, the stoppers 93 become non-rotatable relative to the paper feed holder 41, thereby restricting the position of the leading edge of the document stack.

[0038] When a paper jam occurs, removing the document and closing the DP cover 14 causes the pickup roller 45 (paper feed section 31) to lower (see Figure 4). Feeding paper in this state can lead to jams or a reduced number of sheets that can be fed. For example, as shown in Figure 2, there is no problem when the pickup roller 45 is raised, but as shown in Figure 4, when the pickup roller 45 is lowered (the pickup roller 45 (actuator 47) is visible when looking through the paper feed opening), the above problem occurs.

[0039] Hereafter, the state in which the pickup roller 45 is lowered will be referred to as the NG state. Conversely, the state in which the pickup roller 45 is raised (initial position), as shown in Figure 2, will be referred to as the OK state.

[0040] Here, we will explain the time chart for processing the jam when it occurs, i.e., when a jam occurs, in Figures 5 and 6.

[0041] Figure 5 is a time chart for when there is no manuscript in the DP after jam processing.

[0042] As shown in Figure 5, at the time the jam occurs (timing T1), the document set sensor 143 is in the ON state (the document is placed on it), and the DP cover 14 is closed.

[0043] Furthermore, at the moment the DP cover 14 is opened by the user (timing T2), the document set sensor 143 is in the OFF state, and the cover is in the open state because the DP cover 14 has been opened.

[0044] Furthermore, when the jam is released by the user (timing T3), the jam state becomes non-jammed. At this timing, the cover is still open, so there is no change in the state of the DP cover 14.

[0045] Furthermore, when the DP cover 14 is closed by the user (timing T4), the state of the DP cover 14 is in the closed position. Also, in Figure 5, since there is no document in the DP, the document set sensor 143 is in the OFF state.

[0046] Figure 6 is a time chart for when the original document is in the DP after jamming.

[0047] As shown in Figure 6, at the time the jam occurs (timing T1), the document set sensor 143 is in the ON state (the document is placed on it), and the DP cover 14 is closed.

[0048] Furthermore, when the DP cover 14 is opened by the user (timing T2), the state of the DP cover 14 becomes "cover open," and the document set sensor 143 becomes "OFF." This is because the paper feed unit 31 is located in the DP cover 14, and when the user opens the DP cover 14 to clear a paper jam, the document set sensor 143 determines that there is no document remaining (OFF).

[0049] Furthermore, when the jam is released by the user (timing T3), the jam state becomes non-jammed. At this timing, the cover is still open, so there is no change in the state of the DP cover 14.

[0050] Furthermore, when the DP cover 14 is closed by the user (timing T4), the state of the DP cover 14 is in the closed position. Also, in Figure 6, since there is a document in the DP, the document set sensor 143 is in the ON state.

[0051] Here, if there is a document in the DP, the NG state can be divided into two cases. In this embodiment, the state is classified into a first state and a second state depending on the position of the document in the DP. The first state is when the stopper 93 returns to the correct position (initial posture) by controlling the pickup roller 45. The second state is when the stopper 93 does not return to the correct position even when the pickup roller 45 is controlled.

[0052] Figure 7 is a schematic diagram showing two states. Figure 7A is a schematic diagram showing the first state. Figure 7B is a schematic diagram showing the second state.

[0053] As shown in Figure 7A, when the leading edge of the document 50 (the downstream end in the transport direction) is caught in the pickup roller 45, it can be classified as the first state. That is, when the leading edge of the document 50 is in front of the stopper 93, it can be classified as the first state. Also, as shown in Figure 7B, when the leading edge of the document 50 is behind the stopper 93 (the downstream side in the transport direction), it can be classified as the second state.

[0054] In this embodiment, the document reading unit 10 has a paper feed control unit 130 that controls the stopper 93 to return to the correct position when in the second state.

[0055] Figure 8 is a block diagram showing the configuration of the image forming apparatus 100. In Figure 8, the block including the image forming unit 113 and the paper feeding unit 114 is referred to as the printer 120.

[0056] As shown in Figure 8, the image forming apparatus 100 includes a printer 120 and a document reading unit 10. The printer 120 includes an image forming unit 113, a paper feeding unit 114, an operation panel 115, and a control unit 121. The operation panel 115 includes an operation unit 116 that can receive user input and a display unit 117 that displays various settings and statuses of the image forming apparatus 100. For example, the operation unit 116 includes a numeric keypad for inputting the number of prints and an OK button to indicate user approval. Alternatively, for example, an LE display may be used for the display unit 117. In addition, the operation panel 115 may also have a speaker or the like to inform the user of abnormal conditions of the image forming apparatus 100, such as a jam.

[0057] The control unit 121 communicates with the document reading unit 10 and controls the image reading operation of the image reading unit 60 according to the timing of document transport. Based on the image data acquired by the reading operation, it controls the image forming unit 113 and the paper feeding unit 114 to perform image forming processing.

[0058] The document reading unit 10 includes a paper feed control unit 130, a pickup roller drive unit 140, a transport roller drive unit 141, a paper discharge roller drive unit 142, a document set sensor 143, and a state detection sensor 144.

[0059] The paper feed control unit 130 includes a CPU (Central Processing Unit) 131, a ROM (Read-only Memory) 132, a RAM (Random Access Memory) 133, and a non-volatile memory 134. In this embodiment, the paper feed control unit 130 performs processing to control the vertical movement of the pickup roller 45 (including returning it to its initial position).

[0060] The CPU 131 executes a control program stored in the ROM 132, and in response to detection signals from the document set sensor 143 and various job execution instructions from the user via the control unit 121 of the printer 120 to the operation panel 115, it controls the pickup roller drive unit 140, the transport roller drive unit 141, and the paper output roller drive unit 142.

[0061] ROM 132 stores control programs and other data necessary for transporting documents. RAM 133 is volatile memory and serves as the work area for program execution in CPU 131. Non-volatile memory 134, such as EEPROM (Electrically Erasable Programmable Read-Only Memory), serves as the data storage area for CPU 131.

[0062] The status detection sensor 144 detects whether the pickup roller 45 is in an OK state or an NG state. The status detection sensor 144 outputs the detection result indicating whether the pickup roller 45 is in an OK state or an NG state to the paper feed control unit 130.

[0063] Figure 9 is a flowchart showing the control process for jams by the paper feed control unit 130. Figure 9 illustrates the flowchart showing the control process in the OK state shown in Figure 2.

[0064] As shown in Figure 9, if a jam occurs in the paper feed dispenser (step 101), the user opens the paper feed dispenser cover 14 and removes the jammed document (step 102). At this time, the paper feed control unit 130 may notify the user by displaying a jam code "JAM9XXX" on the display unit 117 of the operation panel 115.

[0065] Once the jam is cleared by the user (the jammed paper is removed), the paper feed control unit 130 notifies the user of the next steps via the display unit of the operation panel 115 (step 103). For example, in step 103, the display unit 117 displays the message "Close the DP cover 14 and press the OK button."

[0066] When the user closes the DP cover 14 and presses the OK button on the operation unit 116 (step 104), the paper feed control unit 130 notifies the user of the next instruction via the display unit 117 of the operation panel 115 (step 105). For example, in step 105, the message "Please place the document" is displayed on the display unit 117. The user then places the document on the document tray 11 in accordance with this message.

[0067] Steps 101 through 105 clear the jam, allowing printing and scanning operations to resume. The paper feed control unit 130 is reset to its state before the jam occurred (the normal state before the abnormality occurred) and restarted (step 106).

[0068] Figure 10 is a flowchart showing the control process for jams when there is a document in the DP. Figure 10 illustrates the flowchart showing the control process in the NG state shown in Figures 4 and 7. Note that steps 101 to 103 of the control process shown in Figure 9 are common to both Figure 10 and are therefore omitted in Figure 10.

[0069] In this embodiment, the document reading unit 10 is equipped with a state detection sensor 144 that detects whether the pickup roller 45 is in an OK state or an NG state. The detection result from the state detection sensor 144 is supplied to the paper feed control unit 130, which then performs one of the processes shown in the flowchart in Figure 9 or Figure 10.

[0070] As shown in Figure 10, when the user presses the OK button (step 104), the document set sensor 143 determines whether or not there is a document in the DP (step 201).

[0071] If it is detected that there is no document in the paper feed tray (NO in step 201), the paper feed control unit 130 starts raising and lowering the pickup roller 45 and waits until the pickup roller returns to its initial position (steps 202, 203).

[0072] When the paper feed control unit 130 returns the pickup roller 45 to its initial position and the lifting and lowering is complete (step 204), the paper feed control unit 130 notifies the user of the next instruction via the display unit 117 of the operation panel 115 (step 205). For example, in step 205, the message "Please place the document" is displayed on the display unit 117. The user places the document on the document tray 11 in accordance with this message.

[0073] Once the jam is cleared, printing and scanning operations can be resumed. The paper feed control unit 130 is reset to the state before the jam occurred (the normal state before the abnormality occurred) and restarted (step 206).

[0074] If there is a document in the paper feed tray (YES in step 201), the paper feed control unit 130 notifies the user of the next instruction via the display unit 117 of the operation panel 115 (step 207). For example, in step 207, the message "Please remove the document from the paper feed tray" is displayed on the display unit 117. If the document is removed (step 208), the process returns to step 104, and the user presses the OK button. As a result, the paper has been removed from the paper feed tray, and the processes in steps 201 to 206 are performed. Furthermore, the state detection sensor 144 selects either the flowchart in Figure 9 or Figure 10, eliminating the need to always activate the document set sensor 143. In other words, by not activating the document set sensor 143 unless the second state occurs, it is possible to reduce costs such as electricity bills.

[0075] As described above, the document reading unit 10 according to this embodiment comprises a pickup roller 45 that pulls out documents one by one from a document tray 11 on which multiple documents are stacked, a document set sensor 143 that detects the presence or absence of documents, an operation panel 115 that accepts user input, and a paper feed control unit 130 that controls the upward drive of the pickup roller 45 based on the detection result of the document set sensor 143 and the operation instructions from the operation panel 115. This reduces costs by eliminating the need to install a sensor to detect the open / closed state of the cover, and enables appropriate control in the event of a paper jam.

[0076] Conventionally, in paper feeders designed to be thin and lightweight without using sensors to detect the opening and closing of the cover, the paper feed section is designed on top of the cover. Therefore, when a jam occurs, the cover must be opened to open and close the paper feed compartment (DP). Because actuators are located on the DP cover, when the user opens the cover to clear a paper jam, the sensor that detects the presence or absence of a document will detect that there is no document remaining. In other words, it was not possible to detect whether the lid was closed after the paper jam had been cleared. Furthermore, when a paper jam occurs, removing the document and closing the cover lowers the paper feed unit, and feeding paper in this state can cause problems such as jams or a decrease in the number of sheets that can be fed.

[0077] This technology uses a sensor to detect the presence or absence of a document, along with input from the control panel, to control the pickup roller to rise only when it is detected that no document is present. This eliminates the need for a sensor to detect the open / closed state of the cover, thus reducing costs. Furthermore, it allows the amount of paper to be used as designed without reducing the paper capacity of the paper dispenser. [Explanation of symbols]

[0078] 10…Manuscript reading section 31…Paper feed section 45... Pickup roller 93... Stopper 100…Image forming apparatus 115... Control panel 130...Paper feed control unit 143…Document detection sensor 144... State detection sensor

Claims

1. A pickup roller pulls out one sheet of paper at a time from a paper tray on which multiple sheets of paper are stacked, A sensor for detecting the presence or absence of the aforementioned paper, An operating unit that receives user input, A paper feed control unit controls the upward drive of the pickup roller based on the detection result of the sensor and the operation instruction from the operation unit. A document reading device equipped with the following.

2. A document reading device according to claim 1, The aforementioned operation instruction includes an instruction indicating that the paper jam in the document reader has been resolved. The paper feed control unit controls the upward drive of the pickup roller based on the detection result from the sensor indicating that there is no paper, and the operation instruction. Document scanning device.

3. A document reading device according to claim 1 or 2, further comprising: The system includes a state detection sensor that detects a first state, which is a state relating to the position of the pickup roller, or a second state different from the first state. The paper feed control unit controls the upward drive of the pickup roller based on the detection result from the state detection sensor. Document scanning device.

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