JP2014015279A - Document conveyance apparatus and method for initializing document conveyance apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a document conveyance apparatus capable of detecting a document set by raising a pickup roller when power is turned on even if a driving source is common to the pickup roller and some of conveyance rollers and not damaging the document.SOLUTION: A document conveyance apparatus includes a document tray 30, a pickup roller 1 that rises and falls with respect to its loading surface, a first conveyance roller 2 for conveying a document and a second conveyance roller 3 on the downstream side thereof, a document detection sensor 16 for detecting the document nipped by the second conveyance roller 3, a driving unit for interlocking a rising operation of the pickup roller 1 and a rotation operation of the second conveyance roller 3, and a control unit for controlling the driving unit. The control unit performs control to raise the pickup roller 1 when power is turned on so that a conveyance amount of the second conveyance roller 3, which interlocks with the rise of the pickup roller 1 when the document has been detected by the document detection sensor 16 is smaller than a similar conveyance amount when the document has not been detected thereby.

Description

  The present invention relates to an original conveying apparatus and an initialization method for initializing the original conveying apparatus when the original conveying apparatus is activated.

  In an automatic document feeder (hereinafter referred to as ADF) that is provided in an image forming apparatus and transports a document to a reading position, if the power is turned on while the document remains on the document transport path, the staying paper is regarded as a jammed document. . An image reading apparatus that detects a jammed document when the power is turned on generally notifies the user of the presence of the initial jam and requests removal of the jammed document. Accordingly, in an image forming apparatus in which the power is turned off while the original remains in the ADF original conveyance path, for example, even if the power is turned on to use only the printer function, the printer does not remove the ADF jam original. The function cannot be used. Although the platen reading should be possible, the platen reading cannot be performed until the ADF jam is released, which may be bothersome. In order to deal with such a problem, there is an image forming apparatus in which an initial jam is not notified immediately after power is turned on, and an initial jam is notified for the first time when an ADF is used.

  On the other hand, in the case of an ADF that lowers the pickup roller onto the document surface on the document tray and conveys the documents one by one, the pickup roller may remain lowered even after the power is turned on. In this case, the document is not set at the correct position on the document tray, and the document setting is not detected. Therefore, there is a problem that the image forming apparatus cannot determine that ADF is used.

  FIG. 10 is a cross-sectional view for explaining problems of the conventional image forming apparatus. In FIG. 10A, since the ADF pickup roller 1 is lifted from the document tray 30, the document bundle 90 set on the document tray 30 reaches the position where the document detection sensor 14 can recognize the document presence / absence. Yes. On the other hand, in FIG. 10B, since the pickup roller 1 is in contact with the document tray 30, if it remains in this state after the power is turned on, the document is detected even if the document bundle 90 is set. The sensor 14 cannot reach the position where the document presence / absence can be recognized. Accordingly, in the case of FIG. 10B, the image forming apparatus cannot recognize that the user intends to use the ADF even though the document bundle 90 is set on the document tray 30. Therefore, an image forming apparatus has been proposed in which when the power is turned on, the pickup roller is raised so that the document bundle enters the position where the document detection sensor can recognize the presence or absence of the document (for example, Patent Document 1). ).

JP 2010-058884 A

  However, in the ADF where the drive source for raising the pickup roller and the drive source of some transport rollers are common, if the pickup roller is raised without considering the presence of a jam document, There is a possibility that the jammed document is conveyed in conjunction. In this case, the document may be damaged.

  The problem of the present invention is that even if the drive source for raising the pickup roller and the drive source for some of the conveying rollers are common, the pickup roller is raised when the power is turned on to set the document at the correct position and detect it. An object of the present invention is to provide an original conveying apparatus that does not damage the original.

  In order to solve the above-mentioned problem, the document transport apparatus according to claim 1 is provided with a document tray on which documents are stacked and a document stacking surface of the document tray that can be moved up and down. A pick-up roller that feeds out to the transport path, a first transport roller that transports the document fed from the pickup roller, and a document that rotates in conjunction with the rise of the pickup roller and that is transported by the first transport roller. Further, a second transport roller that transports, a document detection sensor that detects a document nipped by the second transport roller, and the ascending operation of the pickup roller and the rotation operation of the second transport roller are interlocked. A drive unit to be executed, and a control unit for controlling the drive unit, wherein the control unit raises the pickup roller when power is turned on. When the document is detected by the document detection sensor, the conveyance amount of the second conveyance roller interlocked with the rise of the pickup roller when the document detection sensor detects the document is not detected by the document detection sensor. In this case, the drive unit is controlled so as to be smaller than the conveyance amount of the second conveyance roller interlocked with the rise of the pickup roller.

  The document transport device according to claim 7 is provided with a document tray on which documents are stacked, and a pickup roller provided so as to be movable up and down with respect to a document stacking surface of the document tray, and feeding a document on the document tray to a transport path A first transport roller that transports the document fed from the pickup roller, and a second transport roller that rotates in conjunction with the rise of the pickup roller and further transports the document transported by the first transport roller. A conveying roller, a third conveying roller provided on the downstream side of the second conveying roller, a document detection sensor for detecting a document nipped by the second conveying roller, and an ascending operation of the pickup roller And a first driving unit that executes the rotation operation of the second conveying roller in conjunction with the driving unit, and is provided separately from the driving unit and rotates the third conveying roller. 2 and a control unit that controls the first and second driving units. When the document is detected by the document detection sensor when the power is turned on, the control unit The first and second driving units are controlled to rotate the third transport roller in parallel with the rotation of the transport roller.

  According to the present invention, even if the drive source for raising the pickup roller and the drive source for some of the conveyance rollers are common, the pickup roller can be raised when the power is turned on to set the document at the correct position and detect it. Thus, the original can be prevented from being damaged.

1 is a cross-sectional view illustrating a schematic configuration of a document conveying device according to an embodiment of the present invention. FIG. 2 is a block diagram illustrating a configuration example of a control unit of the document conveying device in FIG. 1. 6 is a flowchart illustrating an initialization processing method of the document conveying device according to the present invention. FIGS. 4A and 4B are diagrams illustrating the document conveying apparatus in a state where an initial jam has occurred, FIG. 4A is a diagram illustrating a state before initialization, and FIG. 4B is a diagram illustrating a state after initialization. . FIG. 2 is a diagram for explaining driving states of a pickup roller, a separation roller, and a drawing roller in the document conveying device of FIG. 1. It is a figure for demonstrating the loop-shaped space part provided in the conveyance path. It is a figure for demonstrating the relationship between the raising amount of a pickup roller, and the rotation amount of a drawing roller. 6 is a flowchart showing an initialization processing method of another document conveying apparatus according to the present invention. FIGS. 9A and 9B are diagrams illustrating the document conveying device in a state where an initial jam has occurred, FIG. 9A is a diagram illustrating a state before initialization, and FIG. 9B is a diagram illustrating a state after initialization. . FIG. 10 is a cross-sectional view for explaining a problem in a conventional document feeder.

  Hereinafter, a document conveying device according to an embodiment of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a cross-sectional view showing a schematic configuration of an image reading apparatus provided with a document conveying apparatus according to an embodiment of the present invention.

  In FIG. 1, an image reading apparatus 500 is an image reading apparatus provided with an ADF, and mainly includes an image reading unit 200, an ADF 100, and a controller unit (not shown).

  The ADF 100 includes a document tray 30 on which the document bundle 90 is stacked, a separation roller 2 and a separation pad 21 for restricting the document bundle 90 from protruding from the document tray 30 and being sent downstream before the document conveyance starts, and a pickup. A roller 1 and a document stopper 22 are provided.

  The pickup roller 1 is provided so as to be able to move up and down with respect to the document stacking surface of the document tray 30, and moves down to the document surface of the document stack 90 stacked on the document tray 30, so The upper document is sent out to the conveyance path. The documents sent out by the pickup roller 1 are separated and conveyed one by one by the action of the separation roller 2 and the separation pad 21 as the first conveyance rollers.

  A drawing roller 3 and a registration roller 4 are provided on the downstream conveyance path of the separation roller 2 in the document conveyance direction, and a conveyance path to the flow reading glass 201 continues on the downstream side of the registration roller 4. A conveyance roller 5 is provided in the conveyance path, and a conveyance roller 51 and a conveyance roller 52 are disposed on the downstream side thereof.

  The drawing roller 3 as the second conveyance roller further conveys the document separated by the separation roller 2 and the separation pad 21 and carries it to the registration roller 4 as the third conveyance roller that is stopped. Touch the leading edge of the document. As a result, the document is bent and the skew of the leading edge of the document is corrected. It should be noted that the bent portion of the document is accommodated in the loop-shaped space 60. The document that has passed the registration roller 4 is conveyed to the surface reading position by the conveyance roller 5, the conveyance roller 51, and the conveyance roller 52. The surface reading position refers to a portion sandwiched between the surface flow reading glass 201 and the surface glass facing member 6.

  The image reading unit 200 facing the surface reading position across the surface reading glass 201 is provided with surface LEDs 203a and 203b for irradiating light to the document passing through the surface reading position and a mirror 204a for guiding reflected light to the surface line sensor 208. , 204b, 204c are provided. The surface LEDs 203a and 203b irradiate the surface of the document passing through the surface reading position, and the reflected light from the document is introduced into the surface line sensor 208 while being bent by the plurality of mirrors 204a, 204b and 204c. The surface image of the document is read.

  A transport roller 7, a transport roller 53, and a transport roller 54 are sequentially arranged on the downstream side of the transport roller 52 in the transport direction. After the front image is read, the document conveyed by the conveyance roller 52 is conveyed to the back surface reading position by the conveyance roller 7, the conveyance roller 53 and the conveyance roller 54. The back surface reading position is a portion sandwiched between the back surface reading glass 101 and the back glass facing member 8.

  On the part facing the back side reading position across the back side reading glass 101, there are back side LEDs 103a and 103b for irradiating the document passing through the back side reading position and mirrors 104a and 104b for guiding the reflected light to the back side line sensor 108. 104c is provided. The back surface LEDs 103a and 103b irradiate the back surface of the document passing through the back surface reading position, and the reflected light from the document is guided to the back surface line sensor 108 while being bent by the plurality of mirrors 104a, 104b, and 104c. Therefore, the document reading of the back image of the document is performed.

  A paper discharge roller 12 is disposed on the downstream side of the conveyance roller 54 in the conveyance direction, and the original conveyed by the conveyance roller 54 is discharged onto the paper discharge tray 13 by the paper discharge roller 12. At this time, the discharge of the document is detected by the discharge sensor 11.

  FIG. 2 is a block diagram illustrating a configuration example of a control unit of the document conveying device in FIG.

  In FIG. 2, the image reading unit 200 and the ADF 100 include, for example, a control unit (hereinafter referred to as “CPU”) 801 that is a common central processing unit. The CPU 801 is connected to a read-only memory (ROM) 802 and a random access memory (RAM) 803. The ROM 802 stores a control program, and the RAM 803 stores input data and work data.

  The CPU 801 is connected to a separation motor 823 (first driving unit), a registration motor 824, a read motor 825, and a paper discharge motor 826. The separation motor 823 moves the pickup roller 1 and the document stopper 22 up and down and rotationally drives the pickup roller 1, the separation roller 2, and the drawing roller 3. When the pickup roller 1 is raised, the document stopper 22 is lowered, and when the pickup roller 1 is lowered, the document stopper 22 is raised. The registration motor 824 (second drive unit) drives the registration roller 4. The read motor 825 drives the transport roller 5, the transport roller 51, the transport roller 52, the transport roller 7, the transport roller 53, and the transport roller 54. The paper discharge motor 826 drives the paper discharge roller 12.

  The CPU 801 also detects a document presence / absence detection sensor 14 that detects a document stacked on the document tray 30, a post-separation sensor 15 that detects a document edge on the document conveyance path, a pull-out sensor 16 as a document detection sensor, a registration sensor 17, and a lead sensor 18. And a paper discharge sensor 11.

  The separation motor 823, the registration motor 824, the read motor 825, and the paper discharge motor 826 are all pulse motors, and the CPU 801 manages the number of rotations of each pulse motor by controlling the number of drive pulses.

  The controller 300 includes a CPU 901. The CPU 901 includes a ROM 902 and a RAM 903, and exchanges data regarding image reading control with the image reading unit 200 and the CPU 801 of the ADF 100 via a serial communication line. The CPU 901 of the controller 300 includes an operation unit 904. The operation unit 904 receives a job input and outputs and displays apparatus information.

  Next, an initialization process executed when the power is turned on in the document conveying apparatus having such a configuration will be described with reference to the drawings.

  FIG. 3 is a flowchart showing the initialization process of the document conveying device according to the present invention.

  The initialization processing of the document conveying device is executed by the CPU 801 in accordance with an initialization procedure that is an initialization program for the document conveying device stored in the ROM 802 and the RAM 803.

  In FIG. 3, when the initialization process of the document feeder is started, the CPU 801 first determines whether an initial jam has occurred (step S701). Specifically, the CPU 801 determines that any of the document detection sensors (see FIGS. 1 and 2) such as the post-separation sensor 15, the pullout sensor 16, the registration sensor 17, the lead sensor 18, and the paper discharge sensor 11 is ON. Based on this detection result, it is determined that an initial jam has occurred. On the other hand, if all the sensors are OFF, the CPU 801 determines that no initial jam has occurred.

  If the result of determination in step S701 is that an initial jam has not occurred (NO in step S701), control is performed so that the document stopper 22 blocks the unloading of the document. That is, the CPU 801 rotates the separation motor 823 forward by a set rotation amount so that the pickup roller 1 rises from the document tray 30 and the document stopper 22 descends (step S704). The rotation amount of the separation motor 823 necessary for lowering the document stopper 22 to a position where the document is prevented from being unloaded is a fixed value designed in advance, and the rotation amount is controlled by the number of drive pulses.

  On the other hand, if the result of determination in step S701 is that an initial jam has occurred (in the case of “YES” in step S701), it is determined whether or not the extraction sensor 16 provided adjacent to the extraction roller 3 is ON. (Step S702). As a result of the determination, if the extraction sensor 16 is OFF (“NO” in step S702), the CPU 801 executes step S704 as in the case of no jammed document. On the other hand, as a result of the determination in step S702, when the extraction sensor 16 is ON (“YES” in step S702), the conveyance amount by the extraction roller 3 is adjusted as described later.

  FIG. 4 is a diagram illustrating the image reading apparatus in a state where an initial jam has occurred, and FIG. 4A is a diagram illustrating a state before initialization. In FIG. 4A, a jam of the document nipped by both the drawing roller 3 and the registration roller 4 has occurred, and the drawing sensor 16 is ON. As described above, when the extraction sensor 16 is ON, the separation motor is rotated forward so that the conveyance amount of the document by the extraction roller 3 becomes D [mm] (step S703), and this process is terminated. When the drawing roller 3 is rotated in a state where an initial jam has occurred, the rotation of the registration roller 4 is stopped. Therefore, rotating the drawing roller 3 pushes the document into the loop space 60. Therefore, the document conveyance amount by the drawing roller 3 is also referred to as a pressing amount. The rotation amount of the separation motor so that the push-in amount of the drawing roller 3 becomes D [mm] is a fixed value designed in advance, and the rotation amount is controlled by the number of drive pulses. D [mm] is the amount of bending (length) of the original that can be allowed in the loop-shaped space 60, and is the maximum amount of pushing by the drawing roller 3.

  Here, driving of the pickup roller 1, the separation roller 2, and the drawing roller 3 will be described.

  FIG. 5 is a diagram for explaining the driving states of the pickup roller 1, the separation roller 2, and the drawing roller 3 in the document conveying device of FIG.

  FIG. 5A shows the behavior of each roller when the separation motor 823 (drive unit) in FIG. 2 is rotated forward. When the separation motor 823 rotates in the forward direction, the lifting operation of the pickup roller 1 and the rotation operation of the drawing roller 3 are executed. That is, when the separation motor 823 is rotated in the forward direction, the pickup roller 1 rotates with the separation roller 2 as the central axis and rises. At this time, the pickup roller 1 is in contact with the upper cover. However, when a load exceeding a predetermined value is applied in the rotational direction of the shaft, the pickup roller 1 does not rise any further. A document stopper 22 that rotates about a point on an imaginary line that connects the central axes of the pickup roller 1 and the separation roller 2 is provided. Descend along. When the pickup roller 1 comes into contact with the upper cover, which is the top dead center, the release end of the document stopper 22 is fixed and does not move even when a load is applied to the pickup roller 1 in the rotation direction. As a result, the leading edge of the document set on the document tray 30 abuts on the document stopper 22 and is no longer sent in the transport direction.

  As the separation motor 823 (drive unit) rotates in the forward direction, the drawing roller 3 on the downstream side of the separation roller 2 rotates in the document transport direction, but at this time, the pickup roller 1 and the separation roller 2 do not rotate. That is, when the pickup roller 1 is raised, the drawing roller 3 rotates in the document transport direction, but the pickup roller 1 itself and the separation roller 2 do not rotate. At this time, the drawing roller 3 is rotated and controlled so that the amount of rotation increases as the amount of lift of the pickup roller 1 increases.

  FIG. 5B shows the behavior of each roller when the separation motor 823 is rotated in the reverse direction. When the separation motor 823 is rotated in the reverse direction, the pickup roller 1 is rotated about the separation roller 2 and lowered. At this time, the pick-up roller 1 is in contact with the upper surface of the document or the tray 30, and is configured so as not to descend further when a predetermined load or more is applied in the rotation direction of the shaft. Further, the release end of the document stopper 22 is released and the pickup roller 1 is rotated in the opposite direction to that when the pickup roller 1 is lifted. As a result, the release end of the document stopper 22 is raised and the document stopper 22 is inclined. The inclination amount of the document stopper 22 increases as the pickup roller 1 descends. In addition, the pickup roller 1 and the separation roller 2 rotate in the document conveying direction with the reverse rotation of the separation motor 823 (drive unit), but the drawing roller 3 does not rotate. With such a configuration, it is possible to control the separation feeding and extraction of the document with only one separation motor 823 without using a clutch or solenoid load. That is, the rotation operation of the pickup roller 1 and the separation roller 2 is in an exclusive relationship with the rotation operation of the drawing roller 3.

  Next, the maximum pushing amount of the drawing roller will be described.

  FIG. 6 is a diagram for explaining a loop space provided in the conveyance path.

  The leading edge of the document drawn by the drawing roller 3 reaches the registration roller 4 on the downstream side. When the drawing roller 3 is further rotated in this state, the leading edge of the document carried into the loop space 60 is in contact with the resist roller 4 in a stopped state, so that the document is bent and bent. The portion is stored in the loop space 60. If the amount of pushing by the drawing roller 3 exceeds the allowable amount of the loop-shaped space 60 in a state where the bent portion of the document is stored in the loop-shaped space 60, the document is folded and wrinkles are generated in the loop-shaped space 60. The maximum pushing amount of the drawing roller allowable in the loop-shaped space 60 is, for example, D [mm], and the D [mm] is the drawing roller 3 in the initialization process when the jammed document is detected by the drawing sensor 16. The maximum push amount (maximum length) is determined. The maximum push-in amount D is a value that varies depending on the size of the loop space, the size of the document, and the like.

  Next, the relationship between the lift amount of the pickup roller 1 and the rotation amount of the drawing roller 3 will be described.

  FIG. 7 is a diagram for explaining the relationship between the lift amount of the pickup roller and the rotation amount of the drawing roller.

  As described with reference to FIG. 5A, when the separation motor 823 is rotated forward, the pickup roller 1 is raised and the release end of the document stopper 22 is lowered and fixed.

  By the way, if the separation motor 823 is rotated so that the release end of the document stopper 22 is lowered to the position where the document is prevented from being sent out, the following inconvenience may occur. That is, the amount of rotation of the drawing roller 3 that rotates in conjunction with the forward rotation of the separation motor 823 may exceed the maximum pushing amount (D [mm]) allowed in the loop space 60. For example, when the pickup roller 1 is raised until the document stopper 22 is raised in a state where there is a document whose tip is in contact with the resist roller 4 that is stopped, the pushing amount of the drawing roller 3 is D [ mm], the document breaks in the space 60 above the loop.

  Therefore, in the present embodiment, when a document is detected by the pull-out sensor 16 during the initialization process, the CPU 801 determines the maximum push-in amount (the push-in amount of the pull-out roller 3 allowed in the loop space 60 ( D [mm]).

  Returning to FIG. 4, FIG. 4B shows a state in which the initial jam (steps S <b> 701, S <b> 702, and S <b> 703) has been completed in the case where an initial jam has occurred. In FIG. 4B, the initial jam original detected by the pull-out sensor 16 is bent along the loop space without being folded in the loop space 60. The amount of lift of the pickup roller 1 at this time is smaller than that in the case where there is no initial jam (FIG. 5A). However, if the document bundle 90 (dotted line) is set on the document tray 30 by the operator in this state, the set document is detected by the document presence / absence detection sensor 14. Therefore, the CPU 801 can recognize that ADF is used. Even in the state shown in FIG. 4B, the original can be prevented from being pushed into the vicinity of the separation roller 2.

  When the original bundle 90 (dotted line) is set in the state of FIG. 4B and an original is detected by the original presence / absence detection sensor 14, a jam screen is displayed on the operation unit 904 (see FIG. 2). When the jam screen is displayed, platen reading is also prohibited until the jam is released.

  According to the initialization process in FIG. 3, when any of the post-separation sensor 15 and the document detection sensor of the pull-out sensor 16 detects a document, the lift amount of the pickup roller 1 is made smaller than when the document is not detected. As a result, the maximum pushing amount (conveyance amount) of the drawing roller that rotates in conjunction with the rising amount of the pickup roller 1 is limited to prevent the document from being bent, and the document can be set on the document tray. Therefore, even if the drive source for raising the pickup roller 1 and the drive source for transporting the document by the transport roller are common and cannot be exclusively processed, the intended purpose can be achieved. That is, the pickup roller 1 can be raised without damaging the original so that the original placed on the original tray 30 can be detected by the original presence / absence detection sensor 14. Further, by limiting the motor to be driven, it is possible to reduce the electric power required for raising the pickup roller 1.

  Next, initialization processing of the document conveying device according to another embodiment of the present invention will be described with reference to FIGS.

  FIG. 8 is a flowchart showing an initialization process of the document feeder according to another embodiment of the present invention.

  This initialization processing of the document conveying apparatus is executed by the CPU 801 when the power is turned on in accordance with an initialization procedure that is an initialization program for the document conveying apparatus stored in the ROM 802 and the RAM 803.

  In FIG. 8, when the initialization process of the document feeder is started, the CPU 801 first determines whether or not an initial jam has occurred (step S901). Presence / absence of an initial jam is determined based on ON / OFF confirmation of document detection sensors (see FIGS. 1 and 2) such as a post-separation sensor 15, a pulling sensor 16, a registration sensor 17, a lead 1 sensor 18, and a paper discharge sensor 11.

  If no initial jam has occurred ("NO" in step S901), the separation motor 823 is rotated forward by a set amount of rotation so that the pickup roller 1 is raised and the document stopper 22 is lowered (step S901). S905). The amount of rotation here is the same as the amount of rotation in step S704 of FIG. 3 in the first embodiment.

  On the other hand, as a result of the determination in step S901, if an initial jam has occurred ("YES" in step S901), it is determined whether or not the extraction sensor 16 is ON (step S902). If the result of determination in step S902 is that the extraction sensor 16 is OFF (“NO” in step S902), step S905 is executed as in the case of no jammed document. On the other hand, when the extraction sensor 16 is ON (“YES” in step S902), the CPU 801 corrects the separation motor 823 by the set rotation amount so that the pickup roller 1 is raised and the document stopper 22 is lowered. Rotate (step S903). The rotation amount here is the same as the rotation amount in step S905. Further, the registration motor 824, the read motor 825, and the paper discharge motor 826 are rotated so as to be executed in parallel with the rotation of the separation motor 823, whereby the respective conveyance rollers are rotated and jammed by the drawing roller 3. The document is conveyed by a predetermined amount (step S904). The rotation time of all the motors in step S904 is the same as the rotation time of the separation motor 823 in step S903, and is controlled based on the number of drive pulses and the drive speed designed in advance. As a result, even if the initial jam original is bent, the drawing roller 3 does not further push the original into the loop-shaped space 60, and the pickup roller 1 is raised to a specified position (FIG. 5A). The document is conveyed until it is done. Accordingly, since the amount of the document that is conveyed is limited, the possibility of the document being damaged during the conveyance of the document can be reduced.

  Note that the rotation amount in S903 may be a rotation amount corresponding to the pickup roller 1 ascending so that the document placed on the document tray 30 can be detected by the document presence / absence detection sensor 14. That is, the rotation amount in S903 may be smaller than the rotation amount in S905.

  Also in the second embodiment, as in the first embodiment, when the document is set on the document tray 30 by the operator after the initialization process and the document is detected by the document presence / absence detection sensor 14, the initial jam is detected. Is detected, a jam screen is displayed on the operation unit 904. When the jam screen is displayed, platen reading is also prohibited until the jam is released. If an initial jam is not detected, the document is fed by inputting a document reading instruction.

  FIG. 9 is a diagram illustrating the image reading apparatus in a state where an initial jam has occurred, and FIG. 9A is a diagram illustrating a state before initialization. In FIG. 9A, a jam of the document nipped by both the drawing roller 3 and the registration roller 4 has occurred. On the other hand, FIG. 9B shows a state in which an initial jam exists, the power is turned on, and the initialization process (S901, S902, S903, S904) in FIG. 8 is completed. In FIG. 9B, the initial jam original nipped between the drawing roller 3 and the registration roller 4 is conveyed not only by the drawing roller 3 but also by the registration roller 4, so that the flexure increases in the loop space 60. It is not carried out and is conveyed by a predetermined amount. Therefore, document folding does not occur.

  According to the initialization process in FIG. 8, when a document is detected by the pull-out sensor 16 when the power is turned on, the operation for raising the pickup roller and the transport operation by the pull-out roller 3 and the transport roller downstream from the pull-up roller 3 are performed in parallel. Control to be executed. Therefore, the original on the conveyance path can be conveyed downstream without being damaged, and the original can be set on the original tray by raising the pickup roller 1.

  The object of the present invention is achieved by executing the following processing. That is, a storage medium that records a program code of software that realizes the functions of the above-described embodiments is supplied to a system or apparatus, and a computer (or CPU, MPU, etc.) of the system or apparatus is stored in the storage medium. This is the process of reading the code.

  In this case, the program code itself read from the storage medium realizes the functions of the above-described embodiments, and the program code and the storage medium storing the program code constitute the present invention.

  Moreover, the following can be used as a storage medium for supplying the program code. For example, floppy (registered trademark) disk, hard disk, magneto-optical disk, CD-ROM, CD-R, CD-RW, DVD-ROM, DVD-RAM, DVD-RW, DVD + RW, magnetic tape, nonvolatile memory card, ROM or the like. Alternatively, the program code may be downloaded via a network.

  Further, the present invention includes a case where the function of the above-described embodiment is realized by executing the program code read by the computer. In addition, an OS (operating system) running on the computer performs part or all of the actual processing based on an instruction of the program code, and the functions of the above-described embodiments are realized by the processing. Is also included.

  Furthermore, a case where the functions of the above-described embodiment are realized by the following processing is also included in the present invention. That is, the program code read from the storage medium is written in a memory provided in a function expansion board inserted into the computer or a function expansion unit connected to the computer. Thereafter, based on the instruction of the program code, the CPU or the like provided in the function expansion board or function expansion unit performs part or all of the actual processing.

DESCRIPTION OF SYMBOLS 1 Pickup roller 2 Separation roller 3 Pull-out roller 4 Registration roller 14 Document presence / absence detection sensor 22 Document stopper 60 Loop space 823 Separation motor 824 Registration motor

Claims (12)

A document tray on which documents are stacked,
A pickup roller provided so as to be movable up and down with respect to the document stacking surface of the document tray, and feeding a document on the document tray to a conveyance path;
A first transport roller for transporting a document fed from the pickup roller;
A second transport roller that rotates in conjunction with the rise of the pickup roller and further transports the document transported by the first transport roller;
An original detection sensor for detecting an original nipped by the second conveying roller;
A drive unit that executes the ascending operation of the pickup roller and the rotating operation of the second conveying roller in conjunction with each other;
A control unit for controlling the driving unit,
The control unit controls the driving unit to raise the pickup roller when the power is turned on, and the second transport roller interlocked with the raising of the pickup roller when a document is detected by the document detection sensor The driving unit is controlled so that the transport amount of the second transport roller is smaller than the transport amount of the second transport roller in conjunction with the rise of the pickup roller when the document is not detected by the document detection sensor. A document conveying apparatus. A third transport roller provided downstream of the second transport roller;
A space that is provided between the second conveyance roller and the third conveyance roller, and stores a deflection of the document conveyed on the conveyance path;
The controller is configured to increase the amount of the pickup roller when the document is detected by the document detection sensor, and increase the amount of the pickup roller when the pickup roller rotates. 2. The drive unit is controlled so that a conveyance amount to the space part becomes a maximum length (D) that can be accommodated in the space part without folding an original document carried into the space part. Document transport device.   3. The document conveying apparatus according to claim 1, wherein the document detection sensor is disposed between the first conveying roller and the second conveying roller.   4. The document conveying apparatus according to claim 1, wherein the document detected by the document detection sensor is a document jammed in the conveyance path. 5. An initialization method for a document conveying device according to any one of claims 1 to 4,
The document conveying device includes:
The pickup roller rotates in one direction as the lift amount increases, and when the pickup roller reaches top dead center, the release end descends to stop sending the document on the document tray, As the amount of lowering of the pickup roller increases, the pickup roller rotates in a direction opposite to the one direction, and the release end rises when the pickup roller comes into contact with the document surface stacked on the document tray. A document stopper that allows the document to be delivered;
The initialization method is:
A determination step of determining the presence or absence of a document by the document detection sensor when the power is turned on;
If the document detection sensor does not detect the document as a result of the determination in the determination step, the pickup roller is raised and the release end of the document stopper is lowered to stop sending the document on the document tray. When,
A method for initializing an original conveying apparatus, comprising: The initialization method is:
If the document detection sensor detects a document as a result of the determination in the determination step, the transport amount of the second transport roller to the space portion is the maximum length (D) that can be accommodated in the space portion. 6. The method for initializing a document conveying apparatus according to claim 5, further comprising a step of setting a conveyance amount in the document. A document tray on which documents are stacked,
A pickup roller provided so as to be movable up and down with respect to the document stacking surface of the document tray, and feeding a document on the document tray to a conveyance path;
A first transport roller for transporting a document fed from the pickup roller;
A second transport roller that rotates in conjunction with the rise of the pickup roller and further transports the document transported by the first transport roller;
A third transport roller provided downstream of the second transport roller;
An original detection sensor for detecting an original nipped by the second conveying roller;
A first drive unit that executes the ascending operation of the pickup roller and the rotating operation of the second transport roller in an interlocking manner;
A second drive unit provided separately from the drive unit and configured to rotate the third transport roller;
A control unit for controlling the first and second drive units,
The controller is configured to rotate the third transport roller in parallel with the rotation of the second transport roller when a document is detected by the document detection sensor when the power is turned on. A document conveying apparatus characterized by controlling a driving unit of the document.   The control unit controls the first and second driving units to stop the rotation of the third transport roller when the rotation of the second transport roller is stopped. The document feeder described.   The control unit controls the first and second driving units to rotate the second conveyance roller without rotating the third conveyance roller when no document is detected by the document detection sensor. The document conveying device according to claim 7.   10. The document conveying apparatus according to claim 7, wherein the document detected by the document detection sensor is a document jammed in the conveyance path. 11. An initialization method for a document feeder according to any one of claims 7 to 10,
The document conveying device includes:
The pickup roller rotates in one direction as the rising amount of the pickup roller increases, and when the pickup roller reaches top dead center, the release end descends to stop carrying out the document on the document tray, As the amount of lowering of the pickup roller increases, the pickup roller rotates in a direction opposite to the one direction, and the release end rises when the pickup roller comes into contact with the document surface stacked on the document tray. A document stopper that allows the document to be unloaded,
The initialization method is:
A determination step of determining the presence or absence of a document by the document detection sensor when the power is turned on;
If the document detection sensor detects no document as a result of the determination in the determination step, the pickup roller is raised and the release end of the document stopper is lowered to stop sending the document on the document tray. Step to
A method for initializing an original conveying apparatus, comprising: The initialization method is:
As a result of determination in the determination step, when the document detection sensor detects a document, the pickup roller is raised and the release end of the document stopper is lowered to stop sending the document on the document tray And a step of driving the second transport roller and the third transport roller to transport the document detected by the document detection sensor to the downstream side. Device initialization method.

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