Document scanning device
The rotatable document stopper in the feeding device addresses document damage issues by aligning the leading edge before feeding, ensuring stable and damage-free document intake.
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Patents
- Current Assignee / Owner
- CANON DENSHI KK
- Filing Date
- 2024-10-08
- Publication Date
- 2026-06-18
Smart Images
Figure 0007875921000001 
Figure 0007875921000002 
Figure 0007875921000003
Abstract
Description
【Technical Field】 【0001】 The present invention mainly relates to a document feeding device. 【Background Art】 【0002】 Among document feeding devices that can be installed in printers, scanners, etc., there are some provided with a rotary stopper so as to control the acceptance and suppression of document feeding into the device body (see Patent Document 1). 【Prior Art Documents】 【Patent Documents】 【0003】 【Patent Document 1】 Japanese Patent Application Laid-Open No. 2008-207944 【Summary of the Invention】 【Problems to be Solved by the Invention】 【0004】 According to Patent Document 1, the stopper is biased in a direction opposite to the document feeding direction, which may damage the document. This may cause an obstacle to the proper feeding of the document into the device body. 【0005】 An exemplary object of the present invention is to enable the proper feeding of a document into the device body with a relatively simple configuration. 【Means for Solving the Problems】 【0006】 One aspect of the present invention relates to a document feeding device, the document feeding device including: a feed roller for feeding a document; a separation roller that sandwiches the document together with the feed roller; a document stopper rotatable between a first posture for suppressing the feeding of the document and a second posture for allowing the feeding of the document; after the document stopper starts rotating from the first posture to the second posture and the document abuts against the separation roller、 The aforementioned feeding roller by The aforementioned manuscript but Import Mare It is characterized by the following: [Effects of the Invention] 【0007】 According to the present invention, it becomes possible to properly capture the original document into the main body of the device. [Brief explanation of the drawing] 【0008】 [Figure 1] A diagram showing an example configuration of an image reading device. [Figure 2] Perspective view of the image reading device. [Figure 3] An enlarged schematic diagram showing the internal structure of the intake port and its surrounding area. [Figure 4] An enlarged schematic diagram showing the internal structure of the intake port and its surrounding area. [Figure 5] An enlarged schematic diagram showing the internal structure of the intake port and its surrounding area. [Figure 6] A block diagram showing the system configuration of the image reading device. [Figure 7] A flowchart showing the method for performing image scanning of a document. [Figure 8] A schematic diagram showing the rotational motion of the guide member. [Figure 9] A schematic diagram showing the rotational motion of the guide member. [Figure 10] A schematic diagram showing the rotational motion of the guide member. [Figure 11] Perspective view of the document scanning mechanism. [Figure 12] A schematic side view illustrating the operation of the document scanning mechanism. [Figure 13] A schematic side view illustrating the operation of the document scanning mechanism. [Figure 14] A schematic side view illustrating the operation of the document scanning mechanism. [Figure 15] A schematic side view illustrating the operation of the document scanning mechanism. [Figure 16] A schematic side view illustrating the operation of the document scanning mechanism. 【Best Mode for Carrying Out the Invention】 【0009】 Hereinafter, embodiments will be described in detail with reference to the accompanying drawings. Note that the following embodiments do not limit the invention according to the claims, and not all combinations of features described in the embodiments are essential for the invention. Two or more of the features described in the embodiments may be arbitrarily combined. Also, the same or similar configurations are given the same reference numerals, and redundant explanations are omitted. 【0010】 (First Embodiment) FIG. 1 shows a configuration example of an image reading apparatus 1 according to the first embodiment. Although details will be described later, the image reading apparatus 1 takes in a document Sh to be image-read into the apparatus main body (inside the housing 10) and reads an image of the taken-in document Sh. The document Sh for which image reading has been completed is discharged onto a discharge tray 12 from a discharge port portion 11, and when there are two or more documents Sh, they are stacked on the discharge tray 12. 【0011】 Here, the document Sh is a sheet-like member (typically a paper material or the like), and it is assumed that images are formed on one side and the other side of the document Sh. The concept of an image includes not only visible things such as characters, symbols, figures, photographs, etc., but also the spaces that can be formed around them or between them. 【0012】 The image reading apparatus 1 is described as having a scanner function in the present embodiment, but as other embodiments, it may additionally / alternatively have other functions. From this perspective, the image reading apparatus 1 may be expressed as a document loading apparatus, a document feeding apparatus, a feeding apparatus, a paper feeding apparatus, etc. 【0013】 The image reading apparatus 1 includes a discharge tray 12, a stacking tray 13, a loading port portion 14, a conveyance mechanism 15, a reading unit 16, a document loading mechanism 17, power sources 18a and 18b, and a power transmission mechanism 19. 【0014】 The stacking tray 13 is capable of holding documents Sh, and if there are two or more documents Sh, they can be stacked on it. The stacking tray 13 may also be referred to as the stacking section, but if the documents Sh are made of paper, it may also be referred to as the paper feed tray, paper feed section, etc. The stacking tray 13 is preferably inclined and extended so that one end on the device body side is downward and the other end is upward. 【0015】 The input port 14 is a part that forms an opening for taking the original document Sh from the loading tray 13 into the main body of the device, and one or more members constituting the housing 10 have a frame shape. 【0016】 As shown in Figure 1, the transport mechanism 15 is configured to form a transport path for the document Sh from the loading tray 13 to the discharge tray 12, and in this embodiment includes a feed roller 151, a separation unit 152, a roller pair (transport roller) 159a, and a roller pair (discharge roller) 159b. In Figure 1, the transport path for the document Sh is shown by a dashed line, and its transport direction is indicated as direction D0. 【0017】 The feed roller 151 is a drive roller located near the intake port 14, and in this embodiment, it rotates in direction D1 by receiving power from the power source 18a, which will be described later. The feed roller 151 also incorporates a one-way clutch, and when the document Sh moves at a speed faster than the peripheral speed of the feed roller 151 due to the roller pair 159a, etc., it moves along with the document Sh. 【0018】 The separation unit 152 shown in Figure 1 includes a separation roller 153 and a holder member 154 (see Figure 3). The separation roller 153 is capable of gripping the original document Sh taken in from the input port 14 together with the feed roller 151. The separation roller 153 has a built-in torque limiter and rotates in direction D2 (see Figure 3) when powered by the power source 18a, but can rotate in direction D2' if a torque exceeding a standard is applied from the feed roller 151 or the original document Sh. As a result, if there are two or more original documents Sh taken in from the input port 14, the ones on the side of the separation roller 153 are returned to the loading tray 13 from the input port 14, or their entry from the input port 14 is prevented. That is, the original documents Sh are taken into the main body of the device one by one downstream and appropriately transported toward the reading unit 16 described later. 【0019】 In this specification, "downstream" refers to the same direction as the transport direction D0. The direction opposite to the transport direction D0 is referred to as "upstream." 【0020】 Here, Figure 2 is a perspective view of the image reading device 1 as seen from the input port 14 side. Furthermore, although details will be described later, Figures 3 to 5 are enlarged schematic diagrams showing the internal structure of the input port 14 and its surrounding area. 【0021】 The holder member 154 shown in Figure 3 rotatably holds the separation roller 153. Here, the separation unit 152 is fixed to the housing 10 so as to be rotatable with its shaft portion Ax1 as the axis of rotation, and is pressed towards the feed roller 151 by the biasing portion 20a. As a result, the separation roller 153 comes into contact with the feed roller 151 and can grip the original document Sh together with the feed roller 151. 【0022】 Returning to Figure 1, roller pair 159a is positioned upstream of the reading unit 16, enabling the document Sh to be gripped by the driven roller and driven roller during transport. In this embodiment, it is positioned between the feed roller 151 and the reading unit 16. Roller pair 159b is also positioned downstream of the reading unit 16, enabling the document Sh to be gripped by the driven roller and driven roller during transport. In this embodiment, it is positioned between the discharge port 11 and the reading unit 16. In this embodiment, the driven rollers of roller pairs 159a and 159b are driven based on the power of the power source 18b. 【0023】 The reading unit 16 is installed between the roller pair 159a and 159b in the transport path of the document Sh. In this embodiment, a pair of reading units 16 are installed, with one reading unit 16 reading the image from one side of the document Sh, and the other reading unit 16 reading the image from the other side of the document Sh. Any known image contact sensor may be used for the reading unit 16, for example, an imaging device composed of a CCD / CMOS image sensor may be used. 【0024】 The enlarged schematic diagrams shown in Figures 3 to 5 illustrate the driving modes of the document acquisition mechanism 17 for acquiring or suppressing the acquisition of the document Sh. 【0025】 The document acquisition mechanism 17 includes an arm 171, a pressing section 172, a document stopper 173, and a holding section 174. The arm 171 is installed inside the housing 10 so as to be rotatable with a shaft Ax2 as the axis of rotation, and is biased by a biasing section 20b in the direction approaching the feed roller 151. The arm 171 is powered by a power source 18b and is rotatable in the direction away from the feed roller 151. 【0026】 The pressing section 172 is supported by the arm section 171 and is located on the opposite side of the document Sh to be taken in from the feed roller 151. In this embodiment, a driven roller is used for the pressing section 172, but any roller that can slide freely against the document Sh or press while following the movement of the document Sh may be used. The arm section 171 is rotatable between a first position P1 (see Figure 3) where the pressing section 172 is separated from the document Sh and a second position P2 (see Figure 5) where the pressing section 172 presses the document Sh (see Figures 3-5), and the pressing section 172 presses the document Sh by the rotation of the arm section 171. 【0027】 The document stopper 173 is supported by the arm portion 171 so as to be rotatable around the shaft portion Ax3 as the axis of rotation, and is also biased by the biasing portion 20c so as to rotate in direction D3. 【0028】 The holding portion 174 holds the document stopper 173 so that the document stopper 173 maintains an upright position while the arm portion 171 is in position P1 (see Figure 3). In this embodiment, the document stopper 173 includes a locking portion 1731 that engages with the holding portion 174, thereby holding it in an upright position. 【0029】 When the arm portion 171 rotates from position P1 to position P2, the document stopper 173 is released from being held by the holding portion 174 and rotates in direction D3 due to the biasing portion 20c, changing from an upright position to a tilted position (see Figure 4). Subsequently, the arm portion 171 is maintained in the rotated state at position P2, while pressing the documents Sh on the stacking tray 13 with the pressing portion 172 until all of them have been taken in (see Figure 5). 【0030】 With this configuration, the document stopper 173 suppresses the capture of the document Sh in the upright position (first position) and allows the capture of the document Sh in the tilted position (second position). The holding part 174 may be fixed integrally to the upper part of the housing 10 or it may be fixed separately. 【0031】 Here, as shown in Figures 4-5, the document stopper 173, biased by the biasing part 20c, is locked in place by contact with the holder member 154. Therefore, the document stopper 173 tilts as the arm part 171 moves away from position P1. On the other hand, as shown in Figure 3, the document stopper 173 becomes upright as the arm part 171 approaches position P1, and when the arm part 171 rotates to position P1, it is held by the holding part 174 and maintained in the upright position. 【0032】 In this embodiment, the power transmission mechanism 19 is configured to transmit power from the power source 18a to the feed roller 151 (see Figure 1). However, in other embodiments, it may be configured to transmit the power incidentally / alternatively to the arm portion 171. Therefore, the power transmission mechanism 19 is located in the path between the arm portion 171 and / or the feed roller 151 and the power source 18. 【0033】 Furthermore, the timing of power transmission from the power source 18a to the feed roller 151 and the arm section 171 is adjustable. This can be achieved by drive control of the power transmission mechanism 19, or incidentally / alternatively by other elements such as a clutch mechanism or a locking mechanism. 【0034】 Known electric motors may be used for the power sources 18a and 18b. In this embodiment, the power source 18a corresponding to the feed roller 151 and the arm portion 171 and the power source 18b corresponding to the drive rollers of the roller pair 159a and 159b are provided separately, but in other embodiments, a single power source may be shared. Alternatively, in yet another embodiment, a power source may be provided individually for each of the feed roller 151, the arm portion 171, the drive roller of the roller pair 159a, and the drive roller of the roller pair 159b. 【0035】 Furthermore, as shown in Figure 2, a feed roller cover 130 is provided on the transport path side of the feed roller 151. A guide member 131 is provided on the feed roller cover 130. The guide member 131 forms a mounting surface f1 on which the original document Sh (downstream end in this embodiment) to be taken into the intake port 14 can be placed. In this embodiment, the guide member 131 is supported by the feed roller cover 130 so that the mounting surface f1 can rotate from a position where it protrudes from the feed roller 151 surface toward the center of the transport path (see Figure 8) to a position where it is further away from the feed roller 151 surface toward the center of the transport path (see Figure 10). 【0036】 In this embodiment, the guide member 131 is biased toward the center of the transport path by the biasing part 20d (see Figure 8) in a side view (viewpoint in the axial direction of the feed roller 151) and abuts against an unillustrated abutment part (see Figure 8). When the number of documents Sh is relatively small, the downstream end of the documents Sh is located toward the center of the transport path (above) the surface of the feed roller 151 and is directed between the feed roller 151 and the separation roller 153. This prevents the documents Sh from getting caught on the feed roller 151 and being unable to be set in the predetermined position when loading the documents Sh onto the loading tray 13, especially when there are only a few documents Sh. Also, when the number of documents Sh is relatively large, the weight causes the guide member 131 to rotate, and the mounting surface f1 is positioned away from the center of the transport path (downward) from the feed roller 151. As a result, the guide member 131 can guide the document Sh so that when the document Sh is taken in, the document Sh is pressed against the pressing part 172 and comes into contact with the feed roller 151 to be properly taken in. 【0037】 Figure 6 is a block diagram showing the system configuration of the image reading device 1. The image reading device 1 further comprises a document loading sensor unit 21a, a double feed detection sensor unit 21b, a first document detection sensor unit 21c, a second document detection sensor unit 21d, an operation input unit 22, and a control unit 23. 【0038】 The document loading sensor unit 21a to the second document detection sensor unit 21d can be installed at several positions along the transport path of the document Sh. In Figure 6, the document loading sensor unit 21a to the second document detection sensor unit 21d are shown as a sensor group 21. The document loading sensor unit 21a is rotatably mounted on the upper part of the housing 10 so as to be aligned with the document stopper 173 in the left-right direction (horizontal direction, substantially perpendicular to the transport direction; width direction of the device) and slightly upstream of the document stopper 173 in the transport direction (see Figure 2), and rotates when the document Sh comes into contact with it and outputs a predetermined detection signal. 【0039】 The double-feed detection sensor unit 21b is capable of detecting when separation by the separation roller 153 is not performed properly. It is installed downstream of the separation roller 153 within the housing 10, and outputs a predetermined detection signal when two or more original documents Sh are detected (i.e., when a double feed occurs). In this embodiment, a sensor equipped with an ultrasonic transmitting element and a receiving element is used, and double feeding is detected by utilizing the attenuation of ultrasonic waves caused by the original documents Sh. 【0040】 The first document detection sensor unit 21c is installed inside the housing 10 on the upstream side of the roller pair 159a and downstream side of the double feed detection sensor unit 21b, and is capable of detecting when the leading edge of the document Sh reaches the feed roller 151, and outputs a predetermined detection signal when the document Sh is detected. In this embodiment, an optical sensor is used, and the arrival of the document Sh is detected when light is blocked by the document Sh. 【0041】 The second document detection sensor unit 21d is installed in the housing 10 downstream of the roller pair 159a and upstream of the reading unit 16. It is capable of detecting when the leading edge of the document Sh reaches the roller pair 159a or when the trailing edge of the document Sh passes the roller pair 159a, and outputs a predetermined detection signal when the document Sh is detected. In this embodiment, an optical sensor is used to detect the arrival of the document Sh by blocking the light caused by the document Sh. 【0042】 Furthermore, the above-mentioned sensors are not limited to those mentioned above; any known sensors may be used for each of the document loading sensor units 21a to the second document detection sensor unit 21d. For example, a lever-type sensor may be used for the document loading sensor unit 21a. For example, optical sensors, ultrasonic sensors, etc., may be used for the double-feed detection sensor units 21b to the second document detection sensor unit 21d. Each of the double-feed detection sensor units 21b to the second document detection sensor unit 21d may consist of a transmitting sensor and a receiving sensor. 【0043】 The operation input unit 22 is an operation panel for the user to input instructions for reading images, and may be installed on any part of the exterior of the housing 10. The operation input unit 22 may also have a display function, and in this embodiment, a touch panel type display can be used as the operation input unit 22 as a typical example. 【0044】 The control unit 23 includes a CPU (Central Processing Unit) 231, memory 232, and a communication interface 233. The CPU 231 reads a predetermined program from another memory (non-volatile memory such as ROM), loads it onto memory 232 (volatile memory such as RAM), and performs the steps described later (see Figure 7) to realize image reading. The CPU 231 can also receive input signals from the operation input unit 22 and detection signals from the document loading sensor unit 21a, etc., via the communication interface 233, and can also receive other input signals from external devices (not shown). 【0045】 The control unit 23 may also be composed of a semiconductor device such as an ASIC (Application-Specific Integrated Circuit) in other embodiments; that is, the functions of the control unit 23 may be realized by either hardware or software. Furthermore, the control unit 23 may also be referred to as a drive control unit, an image reading control unit, a document capture control unit, etc., depending on its function, and may be provided individually according to each function. 【0046】 With this configuration, the control unit 23 controls the drive of each of the above-mentioned elements based on the input signal from the operation input unit 22, detection signals from the document loading sensor unit 21a, etc., so that image reading of the document Sh (and the accompanying capture and ejection of the document Sh) can be realized. As will be described in detail later, for example, the control unit 23 can control the power transmission mechanism 19 so that the feed roller 151 is driven after the arm unit 171 starts rotating from position P1. 【0047】 Furthermore, as shown in Figure 2, the document stopper 173 and the feed roller 151 are arranged side by side, and it is preferable that multiple versions of each be arranged side by side. In this embodiment, the document stopper 173 is integrally rotatably mounted on the arm portion 171 at a total of three locations: the central portion, the left side portion, and the right side portion. The feed roller 151 is also provided at a total of two locations: between the central portion and the left side portion, and between the central portion and the right side portion. With this configuration, as shown in Figure 3, in a side view, the position in which the upright document stopper 173 and the feed roller 151 overlap each other can be moved. As a result, the upright document stopper 173 is located just upstream of the feed roller 151, and the leading edge of the document bundle containing the document Sh before the start of paper feeding is aligned with the document stopper 173, stabilizing the movement of the document when the document Sh is taken in, and appropriately suppressing the taking in of the document Sh. 【0048】 Figure 7 is a flowchart showing the method for reading the image of the original document Sh. This flowchart is mainly executed by the control unit 23, and its outline is that the feed roller 151 is driven after the arm 171 starts rotating from position P1 to prevent damage that may occur to the original document Sh. 【0049】 Step S1010 (hereinafter simply referred to as "S1010"; the same applies to the other steps described later) determines whether or not there is an instruction to start image reading. If there is an instruction to start image reading, proceed to S1020; otherwise, return to S1010. 【0050】 In S1020, the presence or absence of a document Sh on the loading tray 13 is determined based on the detection signal from the document loading sensor unit 21a. If a document Sh is present on the loading tray 13, the process proceeds to S1040; otherwise, it proceeds to S1030. Alternatively, if no document Sh is present, the process may be configured to repeat the determination in S1020 until a predetermined time has elapsed, after which the process proceeds to S1030. 【0051】 In S1030, a notification is output indicating that no original document Sh is present on the loading tray 13, and this flowchart is terminated. This notification can be provided via the touch panel display, which is the operation input unit 22. 【0052】 From S1040 onward, the process of capturing the document Sh is initiated, assuming that the document Sh is present on the loading tray 13. At S1040, the power source 18b, which drives the roller pair 159a and the like, is activated, causing the arm 171 to rotate from position P1 to position P2. Consequently, the document stopper 173 moves from an upright position to a tilted position. As described above, the document stopper 173 is biased by the biasing unit 20c and locked by the holder member 154, thus properly shifting from an upright position to a tilted position. This opens the intake port 14 from a closed state, allowing the document Sh to be captured. 【0053】 When the pressing section 172 moves from position P1 to position P2, the document stopper 173 functions as the transport surface for the document Sh. The orientation of the document stopper 173 at this time is determined by the sliding contact between the document stopper 173 and a locking portion provided on the holder member 154. The sliding contact surface of this locking portion is formed in an arc shape coaxial with the rotation axis of the separation roller 153. This allows the amount of protrusion of the surface of the separation roller 153 from the transport surface of the document stopper 173 to be kept constant during the process of the pressing section 172 moving from position P1 to position P2, thereby maintaining a stable paper feeding state. 【0054】 As mentioned above, the loading tray 13 is inclined and extended. Furthermore, due to the rotation of the arm portion 171, the document Sh on the loading tray 13 is pressed by the pressing portion 172. Also, due to its own weight, the document Sh moves to a position where it contacts the feed roller 151, and is pressed against the feed roller 151 by the pressing portion 172. 【0055】 In S1050, the power source 18a is driven to start the drive of the feed roller 151. As a result, the original document Sh is taken in from the open intake port 14 onto the loading tray 13. 【0056】 In S1060, based on a detection signal output from the second document detection sensor unit 21d indicating that the leading edge of the document Sh has arrived, the reading unit 16 starts reading the image of the document Sh while transporting it. At the same time, the first document detection sensor unit 21c also performs jam detection, such as checking whether the document Sh has reached the second document detection sensor unit 21d within a predetermined time since the start of driving the feed roller 151. 【0057】 In S1070, similar to S1060, the drive of the power source 18a is stopped and the drive of the feed roller 151 is interrupted (temporarily stopped) based on a detection signal output from the second document detection sensor unit 21d indicating that the leading edge of the document Sh has arrived. That is, when the downstream end (leading edge) of the document Sh reaches the second document detection sensor unit 21d, it means that a single document Sh has been properly captured, and the start of capturing the next document Sh is suppressed until the image reading and ejection of the document Sh is completed. Note that although Figure 7 shows S1060 and S1070 being executed sequentially, in reality they may be executed in order or simultaneously. 【0058】 In S1080, image reading is stopped based on a detection signal indicating that the upstream end (rear end) of the document Sh has passed the second document detection sensor unit 21d, and the presence or absence of the document Sh on the stacking tray 13 is determined based on the detection signal from the document stacking sensor unit 21a. If the document Sh is present on the stacking tray 13, the process returns to S1050; otherwise, it proceeds to S1090. That is, if the document Sh remains on the stacking tray 13, steps S1050 to S1080 are repeated, and the process proceeds to S1090 only when the document Sh is no longer present on the stacking tray 13. 【0059】 In S1090, assuming that no documents Sh remain on the loading tray 13, the power source 18b is driven in the opposite direction to the feeding of documents Sh, rotating the arm 171 from position P2 to position P1. Consequently, the document stopper 173 changes from a tilted position to an upright position. In this way, the document Sh is stopped, and the process returns to S1010. 【0060】 According to this embodiment, the document stopper 173 is rotatable between an upright position that suppresses document feeding and a tilted position that allows document feeding. In the upright position, it is held by the holding part 174 and biased by the biasing part 20c to tilt the document. When a document Sh is fed, the document stopper 173 rotates from the upright position to the tilted position prior to the driving of the feed roller 151, and the feeding opening 14 opens from a closed state. Therefore, the leading edge of the document stack can be aligned with the document stopper 173 before the start of document feeding, stabilizing the movement of the document Sh during feeding. After the start of document feeding, the document stopper 173 is biased to retract away from the document Sh. Thus, the document Sh is not pressed against the document stopper 173. As a result, the original document Sh is properly taken into the device body without suffering damage (such as bending or flexing) due to interference with the upright document stopper 173, and the image can be read properly. 【0061】 (Second Embodiment) The second embodiment differs from the first embodiment in that the rotation of the guide member 131 in the feed roller cover 130 of the image reading device 1 is driven and controlled by the control unit 23. The rotation of the guide member 131 may be performed, for example, based on the power of the power source 18b. In this embodiment, the guide member 131 rotates so that when the document stopper 173 is in an upright position, the mounting surface f1 is positioned above the feed roller 151, and when the document stopper 173 is in a tilted position, the mounting surface f1 is positioned below the feed roller 151. This can be configured to be controlled by the driving direction of the power source 18b. For example, by driving the power source 18b in reverse, the document stopper 173 will be in an upright position and the mounting surface f1 of the guide member 131 will be pushed up by a cam member (not shown) so that it is positioned above the feed roller 151. By driving the power source 18b in forward rotation, the document stopper 173 will be in a tilted position and the contact between the cam member (not shown) and the guide member 131 will be released so that the mounting surface f1 of the guide member 131 is positioned below the feed roller 151, and the biasing unit 20d will push down the guide member 131. 【0062】 Figures 8-10 are schematic diagrams showing the rotation of the guide member 131 as the document stopper 173 moves from an upright position to a tilted position. The guide member 131 rotates around the shaft Ax4 as its pivot axis. While the document stopper 173 is in an upright position, the guide member 131 maintains a state in which the mounting surface f1 is positioned above the feed roller 151 by a cam member (not shown) to which power from the power source 18b is transmitted (see Figure 8). As the arm 171 rotates from position P1 to position P2, the document stopper 173 moves away from the holding part 174 and tilts due to the biasing force of the biasing part 20c, during which time the guide member 131 maintains a state in which the mounting surface f1 is positioned above the feed roller 151 (see Figure 9). Subsequently, the guide member 131 is released from the pressure from the cam member and rotates due to the biasing force of the biasing part 20d until the mounting surface f1 is positioned below the feed roller 151 (see Figure 10). 【0063】 With this configuration, when a document Sh is scanned, if the document stopper 173 is in the upright position (the scanning port 14 is closed), the document Sh on the loading tray 13 does not come into contact with the feed roller 151. Therefore, when loading the document onto the loading tray 13, it does not get caught on the surface of the feed roller 151, improving loading operability. In addition, the document stopper 173 aligns the leading edge of the document bundle containing the document Sh to be loaded onto the loading tray 13, stabilizing the movement of the document during scanning. Since the document stopper 173 is biased in the D3 direction in Figure 8, the document Sh will not be unexpectedly damaged due to interference with the document stopper 173. Furthermore, if the document stopper 173 is in the tilted position (the scanning port 14 is open), the document Sh on the loading tray 13 will come into contact with the feed roller 151 and be properly taken into the main body of the device through the scanning port 14. Therefore, according to this embodiment, the import of the original document Sh can be achieved more appropriately. 【0064】 In this embodiment, the drive of the feed roller 151 is started after the document stopper 173 is in a tilted position (the input opening 14 is open), but it is not limited to this. It is sufficient as long as the document Sh does not come into contact with the driven feed roller 151 and strike the document stopper 153 when there is no gap between the document stopper 173 and the feed roller 153 for the document Sh to pass through. Therefore, the timing of the start of the drive can be adjusted within the scope that does not deviate from this purpose. 【0065】 In this embodiment, the control unit 23 drives the power source 18b to rotate the guide member 131. However, in other embodiments, the guide member 131 may be mechanically configured to rotate in conjunction with the rotation of the arm portion 171. For example, the guide member 131 may be linked to the arm portion by a link mechanism, and may rotate along with the arm portion 171 when it rotates from position P1 to position P2. Alternatively, each drive unit may be configured to be driven using a separate power source. Furthermore, power sources 18a and 18b may be configured with the same power source, in which case the timing of drive transmission to each part may be mechanically staggered using a cam or the like. 【0066】 In this embodiment, the guide member 131 is pushed upward above the feed roller 151 by a cam member (not shown), and when the pressure from the cam member is released, the biasing force of the biasing part 20d pushes the guide member 131 downward below the feed roller 151. However, the reverse is also possible. That is, the biasing force of the biasing part 20d pushes the guide member 131 upward above the feed roller 151, and the engagement of the cam member pushes the guide member 131 downward below the feed roller 151. 【0067】 (Third embodiment) The third embodiment differs from the first and second embodiments described above in that the loading tray 13 of the image reading device 1 is configured to be able to lock onto the document stopper 173 in an upright position. 【0068】 Figure 11 is a perspective view of the document acquisition mechanism 17 according to this embodiment. Figures 12 to 16 are schematic side views showing the operation of the document acquisition mechanism 17. In this embodiment, the arm portion 171 is biased by the biasing portion 20b' in a direction approaching the feed roller 151. In this embodiment, the image reading device 1 further comprises an arm support portion 31, a rotating member 32, a rotating member support portion 33, and biasing portions 20e and 20f. 【0069】 The arm support 31 is rotatably mounted on the housing 10 with the shaft Ax5 as the axis of rotation. The arm support 31 is biased in direction D4 by the biasing unit 20e. It is also rotated in direction D4' by power from the power source 18b, thereby holding the arm 171 in a state where it can be maintained at position P1. Here, when the arm 171 is at position P1, the document stopper 173 is in an upright position, and when the arm 171 is at position P2, the document stopper 173 is in a tilted position. 【0070】 The rotating member 32 is mounted to the feed roller cover 130 (see Figure 2) so as to be rotatable with the shaft portion Ax6 as the axis of rotation. The rotating member 32 includes an extension portion 321, and the guide member 131 of the feed roller cover 130 is provided with a contact portion 1311 that contacts the extension portion 321. 【0071】 The rotating member support portion 33 supports the rotating member 32 from below and is rotatably installed relative to the housing 10 with the shaft portion Ax7 as the axis of rotation. The rotating member support portion 33 is biased in direction D5' by the biasing portion 20f. When the rotating member support portion 33 receives power from the power source 18b, it rotates in direction D5, thereby supporting the rotating member 32 so that the extension portion 321 contacts the contact portion 1311. In this embodiment, the guide member 131 is biased by a biasing portion (not shown) in a direction away from the center of the transport path where the mounting surface f1 is moved away from the center of the transport path, and the guide member 131 is held in the position shown in Figure 12 by the extension portion 321 contacting the contact portion 1311. Alternatively, the guide member 131 and the weight of the document may be configured to move the mounting surface f1 away from the center of the transport path. 【0072】 With this configuration, the rotating member 32 forms a gap G1 between itself and the guide member 131 into which the upright document stopper 173 can be fitted. That is, while the arm portion 171 is in position P1, the document stopper 173 is fitted and held in place by the edge forming the gap G1 (see Figure 12). In this view, the gap G1 can be said to function as a second locking part that locks the upright document stopper 173. With this configuration, deflection of the document stopper 173 due to the load of the document Sh on the loading tray 13 can be prevented, preventing the document stopper 173 from being unexpectedly damaged and preventing the leading edge of the document from contacting the separation roller 153 and starting paper feeding without the leading edge being aligned. 【0073】 On the other hand, if the power from the power source 18b transmitted to the arm support 31 is cut off, the arm support 31 rotates in direction D4, and the arm 171 rotates from position P1 to position P2 due to the biasing force of the biasing part 20b'. At approximately the same time, or prior to, the guide member 131 rotates until the mounting surface f1 is positioned below the feed roller 151. This rotation of the guide member 131 occurs as a result of the rotation member support 33 rotating in direction D5', causing the rotation member 32 to rotate in a direction in which the extension 321 retracts from the contact part 1311 due to a biasing part (not shown) (see Figure 13). As a result, the document stopper 173 is released from being held in the gap G1 and becomes tiltable due to the biasing force of the biasing part 20c. 【0074】 Subsequently, the arm support 31 rotates further in direction D4, causing the arm 171 to rotate (see Figure 14). As a result, the locking portion 1731 of the document stopper 173 separates from the holding portion 174, releasing the holding by the holding portion 174, and the document stopper changes from an upright position to a tilted position, and the pressing portion 172 presses against the document Sh (see Figure 15). Then, the document Sh is captured while in this state (see Figure 16). 【0075】 According to this embodiment, the same effects as in the first and second embodiments can be obtained, and it is possible to prevent unexpected damage to the document stopper 173, as well as to prevent the leading edge of the document from coming into contact with the feed roller 151 and the separation roller 153 when setting the document on the loading tray 13. 【0076】 In the embodiments described above, power source 18a and power source 18b were described as separate power sources, but they may be configured as the same power source. In that case, a clutch to interrupt the transmission of driving force and a delay mechanism to delay the transmission of driving force and shift the driving timing should be provided in the drive transmission path from the power source to each roller, etc. 【0077】 (others) In the embodiments, individual elements are named using expressions based on their primary function, but the functions described in the embodiments may also be secondary functions, and the expressions are not strictly limited to these. Furthermore, these expressions can be replaced with similar expressions. In the same vein, the expression "unit" or "portion" may be replaced with "component," "member," "structure," "assembly," etc., or may be omitted. 【0078】 The invention is not limited to the embodiments described above, and various modifications and changes are possible within the scope of the gist of the invention. [Explanation of symbols] 【0079】 1: Image reading device (document input device), 14: Input slot, 173: Document stopper, 174: Holding unit, 20a~20d: Biasing unit.
Claims
[Claim 1] A feed roller for scanning the manuscript, A separation roller that holds the original document together with the feeding roller, The device includes a document stopper that is rotatable between a first position that suppresses the capture of the document and a second position that allows the capture of the document, After the document stopper begins to rotate from the first position to the second position and the document comes into contact with the separation roller, the document is taken in by the feeding roller. A document scanning device characterized by the following features. [Claim 2] A feed roller for scanning the manuscript, A separation roller that holds the original document together with the feeding roller, The device includes a document stopper that is rotatable between a first position that suppresses the capture of the document and a second position that allows the capture of the document, The document stopper rotates from the first position to the second position, creating a gap between the document stopper and the feed roller through which the document can pass, and before the document stopper reaches the second position, the document is taken in by the feed roller. A document scanning device characterized by the following features. [Claim 3] The control unit controls the power transmission mechanism so that the feeding roller is driven after the document stopper begins to rotate to the second position. The document acquisition device according to claim 1 or 2. [Claim 4] The document stopper is provided with an arm portion that allows it to be rotatably supported in the first and second positions. The document acquisition device according to any one of claims 1 to 3. [Claim 5] The holding portion includes a holding portion that holds the document stopper in the first position when the arm portion is in the first position. The document acquisition device according to feature 4. [Claim 6] The document stopper includes a locking portion that engages with the holding portion so as to hold the document in the first position. The document acquisition device according to feature 5. [Claim 7] The system further comprises a holder member that rotatably holds the separation roller. The document acquisition device according to feature 1. [Claim 8] A feed roller for scanning the manuscript, A separation roller that holds the original document together with the feeding roller, The device includes a document stopper that is rotatable between a first position that suppresses the capture of the document and a second position that allows the capture of the document, The feeding roller starts to drive after the document stopper begins to rotate from the first position to the second position. The holder member further comprises a holder that rotatably holds the separation roller. The holder member has a locking portion for locking the document stopper in the second position. A document scanning device characterized by the following features. [Claim 9] It is equipped with a pressing part for pressing the aforementioned document, The pressing portion is supported by the arm portion. The document acquisition device according to feature 4. [Claim 10] The feeding roller is provided on the side of the original document opposite to the pressing portion. The document acquisition device according to feature 9.