JP2005231873A - Document reading device and image processing system device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem wherein a document cannot be set on a paper feeding tray when restoring from a condition in which supply of power to a part of a device is shut off in energy saving mode or the like. <P>SOLUTION: In a configuration provided with a feeding means for feeding documents on the paper feeding tray, a paper feeding path for guiding the document fed by the feeding means, a paper feeding cover provided turnably to open the paper feeding path, a detection means for detecting opening and closing of the paper feeding cover, and a driving means for elevating and lowering the feeding means, a control means for controlling supply of power to the driving means in accordance with the result of detection of the detection means is provided. The feeding means is constituted so as to elevate freely between an upper limit position for setting a document on the paper feeding tray and a feeding position in contact with an upper face of the document on the paper feeding tray. A driving transmission means for driving and connecting the feeding means and the driving means is provided. The driving transmission means is constituted so as to release driving and connection of the feeding means and the driving means by opening the paper feeding cover. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a document reading apparatus on which a document conveying device used in an image forming apparatus such as a copying machine or a printer is mounted, and an image forming system, and more particularly to control of power supplied to the document conveying device or the document reading device. Is.

  2. Description of the Related Art Conventionally, a document conveying device mounted on a document reading apparatus main body includes a sheet feeding unit for separating documents set on a document tray one by one and feeding a document toward an image reading unit, and a sheet feeding unit. The document fed from the scanning unit is supplied to a predetermined position of the image scanning unit of the document scanning device, and the conveyance unit that ejects the image from the image scanning unit after scanning the image and the document ejected from the image scanning unit are ejected to the paper ejection tray. It consists of a paper discharge unit.

  The paper feed unit of the document transport device is provided with a feed roller that can be raised and lowered to feed the document from the paper feed tray, and a paper feed roller and a separating member for separating the document fed from the feed roller into one sheet. The feeding roller and the paper feed roller are attached to a paper feed cover that can be freely opened and closed, and are drivingly connected to the paper feed motor via drive transmission means such as a plurality of gears.

  The feeding roller is configured to move up and down to an upper limit position where the document can be set and a feeding position for feeding the document by forward and reverse rotation of the sheet feeding motor. The document is held at the document setting position by the connection load of the sheet feeding motor (for example, Patent Document 1).

  In addition, the conventional document conveying apparatus as described above includes a driving power supplied to an actuator such as a motor for driving each roller in the document conveying apparatus, each sensor in the document conveying apparatus, a microprocessor, and the like. Power is supplied from a main body device such as a document reading device in two systems, including a control power source supplied to the document reader.

And at the time of an energy saving mode, the power supply for a drive is cut | disconnected and the consumption of useless electric power is suppressed (for example, patent document 2).
JP 2001-354328 A JP 2000-289885 A

  However, the document conveying apparatus that is supplied with power from the main body apparatus such as the above-described conventional document reading apparatus has the following problems in the energy saving mode.

  The feeding roller of the document conveying device is connected to the sheet feeding motor via the drive transmission means with the sheet feeding cover closed, and is configured to be held at the document setting position by this coupling load. Once the paper cover is opened, the connection of the drive transmission means is released, and the paper cover is lowered to a position where it comes into contact with the document placement surface of the paper feed tray.

  At this time, normally, based on the detection signal of the cover open detection means for detecting opening / closing of the paper feed cover, the paper feed motor is driven and the feed roller is controlled to move to the upper limit position where the document can be set. In the energy saving mode, since the power supply of the paper feed motor is cut off, the feeding roller cannot be moved to the upper limit position, and there is a problem that the original cannot be set on the paper feed tray.

  The present invention has been made to solve the above-described problems. When returning from a state where power supply to a part of the apparatus is cut off, such as an energy saving mode, an original can be set on the paper feed tray. The problem is to solve the problems such as no.

The present invention employs the following configuration in order to solve the above problems. First, a feeding means for feeding out the original on the paper feeding tray, a paper feeding path for guiding the original fed by the feeding means, and a paper feeding cover provided to be rotatable to open the paper feeding path. And a control unit that controls supply of power to the drive unit in accordance with a detection result of the detection unit in a configuration including a detection unit that detects opening and closing of the paper feed cover and a drive unit that raises and lowers the feeding unit. Means are provided. The feeding means is configured to be movable up and down between an upper limit position for setting a document on the sheet feeding tray and a feeding position in contact with the upper surface of the document on the sheet feeding tray.
Drive transmission means for drivingly connecting the feeding means and the driving means is provided, and the drive transmission means opens the paper feed cover so that the driving connection between the feeding means and the driving means is released. Constitute. The driving means is configured to raise the feeding means after returning the current to the driving means from the disconnected state to the supplying state under the control of the switch means.

According to the present invention, the detection unit detects whether the paper feed cover is in the open state or the closed state when the power is supplied to the drive unit after the power is cut off in the energy saving mode with the above-described configuration. Since the supply of power to the driving means is controlled based on the detection result of the detecting means, the feeding means is raised and lowered when the paper feed cover is closed, and the driving means when the paper feed cover is open. It is possible to return the feeding means to the normal position by cutting off the power supply to the.

  FIG. 1 is a cross-sectional view illustrating a basic configuration of an image forming apparatus including a document reading apparatus according to the present embodiment. In FIG. 1, reference numeral 1 denotes an image forming apparatus. The document reading device 4 includes first and second platen glasses 10a and 10b serving as platens on which an image is placed, a light source 71, a plurality of mirrors 72, a lens 73, and a CCD 74 serving as a photoelectric conversion unit. Further, the document reading device 4 is provided with a document conveying device 2 which is provided so as to be openable and closable with respect to the first platen glass 10a and feeds the document to the second platen glass 10b. In addition, a sheet processing device 3 for sorting the image-formed sheets to be discharged is provided on the side of the image forming device 1.

  The image forming apparatus 1 includes a sheet feeding unit 6 and an image forming unit 5, and the sheet feeding unit 6 has a plurality of cassettes 51 that store recording sheets and are detachable from the image forming apparatus 1.

  The image forming unit 5 is provided with a photosensitive drum 61. Around the photosensitive drum 61, a charging charger 63 that charges the drum surface, an exposure unit 64 that irradiates image information with a laser beam on the drum, a drum A developing unit 66 that visualizes the electrostatic latent image on the top, a transfer charger 65 that transfers the toner image on the drum to a sheet, a cleaning unit 67 that removes and collects residual toner on the drum, and the like are arranged. . Further, fixing means 62 for fixing the sheet after image transfer is provided on the downstream side of the sheet conveyance of the electrophotographic process means.

  The image forming apparatus 1 prints and outputs a document image read by the document conveying device 2 on a recording sheet. The operation will be described below.

  When a copy start button is pressed on an operation panel (not shown) provided in the image forming apparatus 1, a sheet is fed from the selected cassette. On the other hand, in the document reading device 4, the light from the light source 71 irradiates the document placed on the first platen glass 10 a or the document image sent to the second platen glass 10 b by the document transport device 2. The irradiation light applied to the document image is guided to the CCD 74 by the lens 73 via the plurality of mirrors 72. As a result, the light incident on the CCD 74 is photoelectrically converted, and a document image is read as image data.

  Based on the image processed image data, a laser diode (not shown) of the exposure means 64 is driven, and the photosensitive drum 61 is irradiated with laser light from the laser diode via a polygon mirror. An electrostatic latent image is formed on 61.

  The sheet fed from the sheet feeding unit 6 is sent to the image forming unit 5 at the same timing. In the image forming unit 5, the toner image on the photosensitive drum 61 is transferred to the fed sheet by the transfer charger 65, and then the transfer image is permanently fixed on the sheet by the fixing unit 62. The sheet on which the image is fixed is discharged from the image forming apparatus 1.

  The sheet discharged from the image forming apparatus 1 is sent to the sheet post-processing apparatus 3 and subjected to predetermined post-processing such as stapling, punching, and paper folding, and then discharged outside the apparatus.

  FIG. 2 is a cross-sectional view of the document conveying device, and FIG. 3 is a diagram in which the paper feed cover of the document conveying device is opened. The document conveying device will be described with reference to FIGS.

  The document conveying device 2 includes a sheet feeding tray 15 on which a plurality of documents can be placed, and a sheet feeding unit that separates the documents on the sheet feeding tray 15 one by one and feeds them toward the second platen glass 10b. 11, a transport unit 12 that allows the original to pass along the upper surface of the second platen glass 10 b, a paper discharge unit that receives and discharges the original that has passed through the upper surface of the second platen glass 10 b, and discharges from the paper discharge unit 13 And a paper discharge tray 16 for storing a document from which an image to be read is read. Further, the document feeder 2 switches back the document ejected from the upper surface of the second platen glass 10b by the paper ejection unit 13, sends it back to the paper feeding unit 11, and re-feeds it to the upper surface of the second platen glass 10b. And a switchback unit 14 to be operated. Here, the document tray 15 is inclined and disposed above the paper discharge tray 16 while ensuring a space.

  The document placed on the sheet feed tray 15 is regulated by a side guide 17 that regulates the side portion thereof, and the leading end is regulated by the stopper 30. Further, the paper feed tray 15 is rotatably attached by a fulcrum 15a provided on the leading end side in the document feeding direction.

  The ADF paper feed unit 11 descends and comes into contact with the uppermost surface of the original on the paper feed tray 15, and a feed roller 19 that can be raised and lowered to feed the original, and a paper feed roller 19 that feeds the original fed by the feed roller 18. And a separation means constituted by a separation pad 20 that passes through only one uppermost document and blocks the feeding of the second and subsequent documents, and abuts the leading edge of the document separated into one by this separation means The registration roller pair 21 is sent to the downstream side after being aligned, and the original is fed along the paper feed path 25.

  As shown in FIG. 3, the paper feed path 25 is formed with an upper guide plate 25a and a lower guide 25b facing each other.

  The upper guide plate 25a is integrally attached to the paper feed cover 41 that is rotatably supported by the exterior cover 40 via a rotation fulcrum 41a, and is rotated counterclockwise integrally with the paper feed cover 41. Thus, the paper feed path 25 can be opened and closed. Note that the feeding roller 41, the feeding roller 19, and the driven roller 21b of the registration roller pair 21 are attached to the feeding cover 41 so as to rotate integrally. As a result, the entire paper feed path 25 from the paper feed opening of the original tray 15 to the front of the second platen glass 10b is opened so as to be continuously exposed, and the jammed original can be easily removed. ing.

  Here, the open / closed state of the paper feed cover 41 is detected by a paper feed cover open / close switch S6 serving as a paper feed cover open / close detection means disposed in the exterior cover 40 on the back side of the document conveying device 2. In the sheet feed cover opening / closing switch S6, when the sheet feeding cover 41 is closed, the projection 41b as the operating body formed on the sheet feeding cover 41 pushes the lever and the push button as the operating body of the sheet feeding cover opening / closing switch S6. Thus, it is detected that the paper feed cover 41 is closed. Further, when the paper feed cover 41 is opened, the projection 41b is separated from the lever of the paper feed cover opening / closing switch S6, and the push button returns to the projecting state to detect that the paper feed cover 41 is closed. Has been.

  In this embodiment, a switch type detector is used as the paper feed cover open / close detection means. However, the paper feed cover open / close detection means detects an open / close of the paper feed cover using an optical sensor or the like. Also good.

  The conveying unit 12 includes a pair of carry-in rollers 22 that supply a document to the second platen glass 10b on the upstream side of the second platen glass 10b, and a pair of carry-out rollers that discharge the document from the second platen glass 10b to the downstream side. 23, and conveys the original from the paper feeding unit 11 along the conveyance path 26.

  The paper discharge unit 13 and the switchback unit 14 share a part of the path on the paper discharge tray 16 side, and a paper discharge roller pair 24 that discharges a document to the paper discharge tray 16 is provided.

  As will be described later, the paper discharge roller pair 24 rotates in the reverse direction with the rear end side of the original being nipped in the double-side mode for reading the double-sided image of the original to switch back the original and send it to the paper supply unit 11. Further, the paper discharge roller pair 24 can be transported without any trouble when the leading and trailing edges of the document circulated from the switchback unit 14 via the paper feed unit 11 and the transport unit 12 pass each other. The paper discharge driven roller 24b is separated from the paper discharge driven roller 24b.

  Further, a flapper 30 that guides the document to the paper feeding unit 11 is provided in a shared part of the paper discharge unit 13 and the switchback unit 14. The flapper 30 is always biased downward by a biasing spring (not shown), and when the document is sent along the paper discharge path 27 to the pair of paper discharge rollers 24, the flapper 30 The document is pushed upward by the leading edge to allow passage of the document, and when the document is switched back by the discharge roller pair 24, the document is positioned below to block the discharge path 27 and guide the document to the circulation path 28. It is configured.

  The circulation path 28 and the paper feed path 25 are configured to join at the nip point of the registration roller pair 21, and a mylar 28 c that guides the document to the nip point of the registration roller pair 21 is extended at this joining position. ing.

  Next, the driving configuration of each roller will be described. In the document conveying apparatus of the present embodiment, each roller is driven by a feed motor M1 and a conveying motor M2 that can freely rotate forward and backward.

  As shown in FIG. 4, in the drive transmission system of the paper feed motor M1, when the paper feed motor M1 is first driven to rotate forward, the drive is transmitted from the pulley P16 to the pulley P36 via the timing belt T16, and the pulley P36 is driven. The gear Z17, the gear Z19, and the gear Z18 attached to the drive shaft of the paper feed roller 19 are transmitted in this order, and the paper feed roller 19 rotates in the direction of feeding the document. A pulley P18 is provided on the drive shaft of the paper feed roller 19, and the drive roller 18 is also driven via a timing belt T2 stretched between the pulley P11 provided on the shaft of the feed roller 18. Is transmitted. Further, one end side of elevating arms 18a and 18b that support the feeding roller 18 is attached to the drive shaft of the paper feed roller 19, and the drive shaft rotates in the paper feed direction (forward drive of the paper feed motor M1). As a result, the lift arm is rotated and the feed roller 18 is lowered. When the feed roller contacts the document, the drive shaft of the paper feed roller 19 is idled with respect to the lift arms 18a and 18b by the action of the spring clutch A and spring clutch B. It is configured to do. At this time, the registration drive roller 21a is connected by a pulley P28 provided on the drive shaft and a timing belt T3 stretched around a pulley P22 provided coaxially with the pulley P36. The one-way clutch OW1 provided does not rotate.

  The reverse rotation driving of the sheet feeding motor M1 is transmitted from the pulley P16 to the pulley P36 via the timing belt T16, and is attached to the shaft of the registration driving roller 21a via the timing belt T3 from the pulley P22 provided coaxially with the pulley P36. Is transmitted to the pulley P28, and the registration driving roller 21a is rotated in the paper feeding direction. At this time, the reverse driving of the paper feed motor M1 is also transmitted to the drive shaft of the paper feed roller 19, and the feeding roller 19 is raised by rotating the elevating arm 18a counterclockwise. Is not rotated by the action of the one-way clutch WO2 provided in the motor. The raised lifting arm abuts against a regulating member (not shown), and the drive shaft of the sheet feeding roller 19 is configured to idle with respect to the lifting arm 18a by the action of the spring clutch C.

  Even if the driving of the paper feed motor M1 is stopped while the lifted arm 18a is raised, the lift arm 18 is held at the raised position by the load of the paper feed motor M1 and the load of the drive system in the stopped state. It is configured as follows.

  In such a configuration, the gear Z18 attached to the drive shaft of the paper feed roller 19 is disposed on the paper feed cover 41 together with the feed roller 18 and the paper feed roller 19, and rotates integrally therewith. As shown in FIG. 5, the paper feed cover 41 is rotated to open the paper feed path 25 so that the paper feed cover 41 is separated from the gear Z19 attached to the side plate (not shown) of the document conveying device and closed to close the gear. It is configured to mesh with Z19.

  That is, when the sheet feeding cover 41 is opened, the feeding roller 18 is released from being held at the raised position and lowered. Then, since the feeding cover 41 is closed while the feeding roller 18 is lowered, the feeding roller 18 is lowered and the gear Z18 meshes with the gear Z19, so that the feeding roller 18 is in the lowered position. Will be held.

  Next, the transport motor M2 rotates the carry-in (drive) roller 22 and the carry-out (drive) roller 23 through a plurality of gears, pulleys, and timing belts, and forwardly or reversely rotates the paper discharge drive roller 24a. .

  Further, as described above, the paper discharge roller pair 24 is configured to be separable, and is provided with a pressure contact solenoid SOL as a drive source thereof. By exciting (ON) this pressure contact solenoid SOL (not shown), the discharge driven roller 24b is moved to a position where it is pressed against the discharge drive roller 24a, and by releasing (OFF) the excitation, the discharged paper driven roller 24b. The paper discharge driven roller 24b is moved to a position away from the paper discharge drive roller 24a by the action of a biasing spring that urges the paper in the direction away from the paper discharge drive roller 24a.

  Here, in the document conveying device 2, as shown in FIG. 2, an empty sensor S <b> 1 for detecting that a document is placed on the sheet feeding tray 15 is provided in the sheet feeding tray 15. A registration sensor S2 is provided for detecting the edge of the fed document. Further, a lead sensor S3 is provided on the upstream side of the second platen glass 10b, and a discharge sensor S4 is provided in front of the paper discharge roller pair 24, and these sensors detect the edge of the document to be sent.

  As shown in the control block diagram of FIG. 6, each of the sensors S1 to S4 is connected to a control board as a control means including a CPU 100 for controlling the conveyance of the document. Based on this, the motors M1 and M2 and the solenoid SOL1 described above are controlled, and the document feeding operation is executed.

  The paper feed tray 15 is provided with a sensor S5, and the length of the original placed on the original tray 15 is detected by the original detection state (ON-OFF state) of the sensor S5. Further, the width of the original is detected from the volume VR whose output changes depending on the amount of movement of the side guide 17 on the paper feed tray 15. The document size is determined based on the detection result of the document length and document width.

  Next, the operation of the document feeder will be described.

  The document conveying apparatus of this embodiment has a single-sided reading mode for reading only one side of a document and a double-sided reading mode for reading both sides of a document.

  First, in the operation in the single-sided reading mode, when the empty sensor S1 detects that a document is placed on the paper feed tray 15, the paper feed motor M1 is driven to rotate forward and the document is fed by the feed roller 18. The fed document is separated into one sheet by a separating unit including a sheet feeding roller 19 and a separation pad 20, and is fed downstream. When the registration sensor S2 detects the leading edge of the document, the paper feed motor M1 is temporarily stopped after a predetermined time from the detection. At this time, the leading edge of the document is brought into contact with the nip portion of the registration roller pair 21 and aligned. After this stop, the paper feed motor M1 is driven in reverse, the transport motor M2 is driven, and the pressure contact solenoid SOL is further excited. As a result, the registration roller pair 21 and the carry-in roller 22 are driven and supplied onto the second platen glass 10b. Then, the surface (one side) of the document is read by the reading unit with the second platen glass 10b. Thereafter, the read original is guided to the carry-out roller 23 and is discharged onto the paper discharge tray 16 by the paper discharge roller pair 24.

  Next, the double-sided reading mode will be described. Until the original on the paper feed tray 15 is supplied to the second platen glass 10b and read on the front surface (one side), it is sent to the carry-out roller 23 and the discharge roller pair 24. Is the same as in the single-sided reading mode.

  Thereafter, in the double-sided reading mode, a refeed operation is executed.

  In the re-feed operation, when the trailing edge of the document sent to the paper discharge roller pair 24 is detected by the paper discharge sensor S4, the driving of the transport motor M2 is stopped. At this time, the front end side of the original is discharged onto the discharge tray 16, and the rear end side is nipped by the discharge roller pair 24 and stopped.

  Thereafter, when the transport motor M2 is driven in reverse, the paper discharge roller pair 24 rotates in the reverse direction, the original is switched back along the original guide surface of the flapper 30 that has moved to a position that closes the paper discharge path 27 as the original passes. Then, the switchback path 28 is fed in the direction of the paper feeding unit 11. Then, the leading edge of the original strikes again at the nip portion of the registration roller pair 21 and is aligned. Then, in order to re-feed the original, the paper feeding motor M1 is driven in reverse, and after the time that the leading edge of the original reliably nips the registration roller pair 21, the excitation of the pressure contact solenoid SOL is released and the paper discharge driven roller 24b. Is separated from the paper discharge drive roller 24a, and the transport motor M2 is driven to rotate forward. As a result, the original is reversed and fed along the paper feed path 25, and is supplied again to the second platen glass 10 b by the carry-in roller pair 22. Then, like the front surface, the back surface is read by the reading unit with the second platen glass 10b. Thereafter, the read original is guided to the carry-out roller 23 and guided to the paper discharge roller pair 24.

  At this time, the leading end side of the document sent to the sheet discharge tray 16 and the trailing end side of the document to be re-fed are passed by a common portion of the discharge path 27 and the circulation path 28 including the discharge roller pair 24. Since the discharge roller pair 24 is in a separated state, it can be conveyed without any trouble.

  Thereafter, when the registration sensor S2 detects the trailing edge of the document, the pressure contact solenoid SOL is excited and the paper discharge roller pair 24 is pressed.

  When the paper discharge sensor S4 detects the trailing edge of the document, the driving of the carry motor M2 is stopped. Then, in order to discharge the document to the discharge tray 16 in the same page order, the refeeding operation is performed again to guide the document to the discharge roller pair 24 via the second platen glass 10b. Then, the document is discharged to the discharge tray 16 by the discharge roller pair 24. Here, the original is not read.

  As shown in the control block diagram of FIG. 6, the control unit is configured mainly with storage means such as a CPU 100, a ROM 101, and a RAM 102.

  The ROM 101 stores in advance a control program for controlling the document conveying device, and the CPU 100 executes the control program to operate the document conveying device.

  The states of the various sensors S1 to S4, the paper feed cover opening / closing switch S6, and the ADF opening / closing switch S7 are input from the respective input circuits to the CPU 100, and by this input signal, the CPU 100 controls the motor and solenoid drive circuits. Each motor and solenoid is controlled by outputting.

  The document conveying device communicates information data with the document reading device 4 via the serial interface input / output circuit 103, and the received data includes document feeding / exchange / discharge of the document from the document reading device 4. In addition, the transmission data includes document feeding / exchange / discharge operation completion signals, detected document size data, various sensors, switch detection information data, and the like.

  Further, the power supply of the document conveying device is composed of a logic system power source supplied to a control circuit for controlling each motor, solenoid and the like, and a drive system power source supplied to each motor and solenoid drive circuit. .

  Further, reference numeral 104 denotes a drive system power supply control circuit (power supply control means), which enables on / off (energization, cutoff) control of the drive system power supply according to a signal from the CPU 100.

  The ADF open / close switch S7 functions as an interlock switch that cuts off the drive system power supply, and the open / close state of the document conveying device is detected by a detection circuit that detects the opening / closing of the document conveying device according to the energized state of the power supply. That is, drive system power from the drive system power supply control circuit 104 is supplied to the drive circuits for the motors and solenoids via the ADF open / close switch S7.

  Here, the energy saving mode is activated when a predetermined condition does not occur within a predetermined time (about 5 minutes) after receiving a signal indicating that the final document conveyed by the document conveying device has been discharged to the discharge tray 16. Is configured to do.

  This energy saving mode will be described in detail. FIG. 7 is a flowchart showing the activation operation in the energy saving mode, and FIG. 8 is a flowchart showing the releasing operation in the energy saving mode.

  First, when it is confirmed that the final document has been discharged to the discharge tray 16 (ST1), the paper feed cover 41 is closed, the document transport device 2 is closed, and the empty sensor S1 is the document. Is not detected, and it is confirmed that there is no paper feed command from the document reader 4 (ST2 to ST5). If all these conditions are satisfied, a timer (counting means) TM is started to measure the set time (ST6).

  Then, it is monitored whether all of the above conditions are satisfied until the paper feed timer TM reaches the set predetermined value (time) in ST7, and if the set predetermined value is reached, the drive system A power supply OFF signal is output to the control circuit to turn off (cut off) the drive system power supply, thereby cutting off the supply of power to the drive circuit such as a motor (ST8). As a result, the document conveying device enters a standby state, and wasteful power consumption is suppressed.

  Then, the timer TM is reset to end the energy saving mode starting operation (ST9).

  Further, when the paper feed cover 41 is opened under the above conditions and when the document conveying device 2 is opened, wait until the paper feeding cover 41 and the document conveying device 2 are opened, The process proceeds to the next step, and when the empty sensor S1 detects a document and receives a paper feed command from the document reading device 4, the process is terminated without shifting to the energy saving mode.

  That is, here, the empty state of the empty sensor S1, the closed state of the paper feed cover 41, the closed state of the original conveying device 2, and the state in which no paper feed command is received from the original reading device 4 are confirmed. It is controlled to automatically shift to the energy saving mode when it continues for a time.

  Next, the operation for releasing the energy saving mode will be described with reference to FIG. 8. During the energy saving mode, the outputs of the empty sensor S1 and the paper feed cover opening / closing switch S7 are constantly monitored (ST11 to ST12). When it is detected or the paper feed cover open / close switch S7 detects the open / close of the paper feed cover 41 (from the closed state to the open state and then to the closed state), the drive system power supply control circuit 104 is turned on (energized). Power is supplied to each circuit for driving (ST13). Then, the sheet feeding motor is reversely rotated for a predetermined time, and the feeding roller is controlled to be raised to the document setting position (ST14).

  As a result, the feeding roller 18 held at the raised position by the load of the drive transmission system of the paper feed motor once separates the gear Z18 and the gear Z19 of the drive system of the paper feed motor M1 once the paper feed cover 41 is opened and closed. The feeding roller 18 that has been lowered can be raised to the document setting position without any trouble, so that even if the paper feed cover 41 is opened and closed during the energy saving mode, the feeding roller 18 does not interfere with document setting.

  Note that when the energy saving mode is canceled by detecting the document with the empty sensor S1, the feeding roller 18 is raised to the document setting position, but as described above, the torque limiters A and B of the feeding roller 18 are set. Even if the sheet feeding motor M1 is reversely rotated by the action, the feeding roller 18 does not rise.

  In the above embodiment, after the power control circuit 104 is turned on and power is supplied to each circuit for driving later, the paper feed motor M1 is reversely rotated for a predetermined time to raise the feeding roller 18 to the document setting position. However, in a general ADF, in consideration of performing an operation of moving the feeding roller 18 to the document setting position by reversing the sheet feeding motor M1 for a predetermined time during an initial operation, the power control circuit 104 is turned on for driving. After supplying power to each circuit, a signal notifying that the energy saving mode has been canceled is transmitted to the document reading device 4, and the ADF is initialized by the reset signal from the document reading device 4 that has received this cancellation signal. Good. In this way, when the energy saving mode is canceled, the CPU of the ADF is always reset and the initialization operation is performed, so that the feeding roller 18 can be moved to the document setting position by reversing the sheet feeding motor for a predetermined time.

  Next, a third embodiment according to the present invention will be described.

  In the first embodiment, the document conveying device 2 is independently operated in the energy saving mode. However, in the third embodiment, as shown in the block diagram of FIG. 204 is provided, and the drive system power supply control circuit 204 is turned on and off (energized and cut off) by the CPU 200 on the document reading device 4 side to control the power supply to the document conveying device 2.

  The configuration other than that shown in FIG. 9 is the same as the configuration shown in FIG.

  FIG. 10 is a flowchart showing the start-up operation of the energy saving mode according to the third embodiment, and FIG. 11 is a flowchart showing the releasing operation of the energy saving mode.

  The activation and release operations of the energy saving mode will be described with reference to FIGS. 10 and 11. First, when it is confirmed that the final recording sheet has been discharged outside the apparatus (ST21), the CPU 200 of the document reading device 4 reads the document. It is confirmed whether a paper feed cover opening / closing signal, an ADF opening / closing signal, and an empty sensor document detection signal are received from the conveying device 2 (ST22 to ST24). If all of these signals have not been received, it is confirmed whether the operation panel including the copy start button has been operated (ST25). If not, a timer (counting means) is used to measure the set time. TM is started (ST26).

  The paper feed cover opening / closing signal, the ADF opening / closing signal, and the empty sensor document detection signal are not received from the document feeder 2 until the feed timer TM reaches the predetermined value (time) set in ST27. If the operation panel (not shown) is not operated, a power-off signal is output to drive system power supply control circuit 204 to turn off (shut off) the drive system power supplies of document feeder 2 and document reader 4 (ST28). Finally, the timer TM is reset to end the energy saving mode starting operation (ST29).

  As a result, the document reading device 4 and the document conveying device 2 are in a standby state, and power consumption is greatly suppressed.

  When the paper feed cover open / close signal and the ADF open / close signal are received, the process waits until the paper feed cover 41 and the document conveying device 2 are opened and proceeds to the next step, and receives an empty sensor document detection signal. When the operation panel is operated, the process ends without shifting to the energy saving mode.

  Here, the paper feed cover open / close signal is a signal indicating that the paper feed cover 41 has been opened from the closed state, and the ADF open / close signal is a signal from the closed state to which the document feeder 2 is opened. It is a signal indicating that. The empty sensor document detection signal is a signal indicating that a document is placed on the paper feed tray 15.

  As shown in FIG. 11, in the energy saving mode, the empty sensor document detection signal and the information by the paper feed cover open / close signal are constantly monitored during the energy saving mode (ST31 to ST32), and the empty sensor document detection signal is received. When the paper feed cover open / close signal is received, the drive system power supply control circuit 204 is turned on (energized) to supply power to each circuit for driving (ST33).

  Then, an instruction signal for raising the feeding roller 18 is transmitted from the CPU 200 of the document reading device 4 to the document conveying device 2 (ST34). In response to this, the CPU 100 of the document conveying device 2 reverses the sheet feeding motor M1 for a predetermined time and raises the feeding roller 18 to the document setting position.

  As a result, even if the paper feed cover 41 is opened and closed during the energy saving mode, it is possible to set a document without any trouble, and further, it is possible to turn off the drive system power supply of the document reading device 2, so that a significant amount of power is consumed. Can be reduced.

  Further, Example 4 will be described.

  In the fourth embodiment, as shown in the block diagram of FIG. 12, the document reading device 4 is provided with a drive power supply control circuit 304 and a logic power supply control circuit 306. The logic system power supply of the document reading apparatus 4 is controlled by the drive system power supply and logic system power supply control circuit 306 of the apparatus 4, and the drive system power supply control circuit 304 and logic of the document reading apparatus 4 are controlled by the output signal from the document conveying apparatus 2. The system power supply control circuit 306 is turned on and off to control the supply of the drive system power supply of the document conveying device 2 and the logic system power supply of the document reading device 4.

  By configuring the document reading apparatus and the ADF system in this way, it becomes possible to turn off all of the drive system power supply and logic system power supply of the document reading apparatus in the energy saving mode, thereby greatly reducing the power consumption of the system. Is possible.

  In each of the above embodiments, the document conveying device and the document reading device have been described. However, in the case of a system configuration in which power is supplied from the image forming device to the document reading device and the ADF, a drive system power supply control circuit or a logic system power supply is provided. It is also possible to provide a control circuit in the image forming apparatus to control the drive system power supply and logic system power supply of the document reading apparatus and the drive power supply of the ADF. In this case, the original reading apparatus according to the second to third embodiments may be replaced with an image forming apparatus, and thus detailed description thereof is omitted.

  Further, in the embodiments shown in the second and third embodiments, the detection of the ADF empty sensor, the detection state of the paper feed cover open / close switch, and the ADF open / close switch is detected from the control unit provided in the ADF, or the document reading device or the image forming However, the detection of the empty sensor, the electrical signal from the paper feed cover open / close switch and the ADF open / close switch are directly input to the control unit of the original reading apparatus or image forming apparatus, and the original reading apparatus or image The drive system or the logic system power supply may be controlled from the control unit of the forming apparatus.

  In this embodiment, power can be supplied to the logic circuit of the document reading apparatus or the image forming apparatus, and the ADF logic power can be cut off.

  As described above, in this embodiment, when the opening / closing of the paper feed cover is detected during the operation in the energy saving mode, the feeding roller is raised after the energy saving mode is canceled and the power for driving the ADF is supplied. Therefore, the original can be set on the paper feed tray without any trouble.

1 is a cross-sectional view of an image forming apparatus including a document reading device. FIG. 3 is a cross-sectional view of a document conveying device. FIG. 6 is a diagram illustrating a state in which a paper feed cover of the document conveying device is opened. FIG. 6 is a diagram illustrating a paper feed drive of the document conveying device. It is a figure which shows the state of connection / release of paper feed drive transmission by rotation of a paper feed cover. It is a control block diagram. It is a flowchart which shows starting operation | movement of energy saving mode. It is a flowchart which shows cancellation | release operation | movement of an energy saving mode. It is a control block diagram of a 3rd example. It is a flowchart which shows the energy-saving mode starting operation | movement of a 3rd Example. It is a flowchart which shows energy-saving mode cancellation | release operation | movement of a 3rd Example. It is a control block diagram of a 4th example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Image forming apparatus 2 Original conveying apparatus 3 Sheet | seat post-processing apparatus 4 Original reading apparatus 5 Image forming part 6 Paper supply part 10a, 10b 1st, 2nd platen glass 15 Paper supply tray 18 Feeding roller 19 Paper supply roller 21 Registration roller Pair 22 Carry-in roller 23 Carry-out roller 24 Paper discharge roller pair 25 Paper feed path 41 Paper feed cover 41b Projection 61 Photosensitive drum S6 Paper feed cover open / close switch

Claims (7)

A feeding means for feeding out the document on the paper feed tray;
A paper feed path for guiding the document fed by the feeding means;
A paper feed cover rotatably provided to open the paper feed path;
Detection means for detecting opening and closing of the paper feed cover;
In a document reading apparatus provided with a driving means for raising and lowering the feeding means,
An original reading apparatus, comprising: a control unit that controls supply of power to the driving unit according to a detection result of the detection unit. A feeding means that can be moved up and down to feed the document on the paper feed tray;
A paper feed path for guiding the document fed by the feeding means;
A paper feed cover rotatably provided to open the paper feed path;
Detection means for detecting opening and closing of the paper feed cover;
In a document reading apparatus provided with a driving means for raising and lowering the feeding means,
Providing a switch means for connecting and disconnecting the supply of power to the drive means;
An original reading apparatus characterized in that the switch means is controlled so as to return the current to the driving means from a disconnected state to a supplied state in accordance with a detection result of the detecting means.   2. The feeding device according to claim 1, wherein the feeding means is configured to be movable up and down to an upper limit position for setting a document on the sheet feeding tray and a feeding position contacting the upper surface of the document on the sheet feeding tray. The document reading device according to claim 2.   Drive transmission means for drivingly connecting the feeding means and the driving means is provided, and the drive transmission means releases the driving connection between the feeding means and the driving means by opening the paper feed cover. The document reading apparatus according to claim 1, wherein the document reading device is a document reading apparatus.   5. The document reading apparatus according to claim 4, wherein the feeding means is held at the upper limit position by a load of the driving transmission means in a state where power supply to the driving means is cut off.   3. The document reading apparatus according to claim 2, wherein the driving unit raises the feeding unit after the current to the driving unit is returned from the disconnected state to the supply state by the control of the switch unit. A document conveying means for conveying the document on the sheet feeding tray to a predetermined position;
An original reading means for reading an image of the original conveyed to a predetermined position by the original conveying means;
In an image processing system apparatus comprising image forming means for forming an image on a recording sheet based on an original image read by the original reading means,
A feeding means for feeding out the document on the paper feed tray;
A paper feed path for guiding the document fed by the feeding means;
A paper feed cover rotatably provided to open the paper feed path;
Detection means for detecting opening and closing of the paper feed cover;
Drive means for raising and lowering the feeding means;
An image processing system apparatus comprising: a control unit that controls supply of power to the driving unit according to a detection result of the detection unit.

Images