JP2006270316A - Image reading and recording apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image reading and recording apparatus that can be miniaturized and inexpensive while ensuring the transport accuracy of a recording sheet and an original by avoiding an action of a back tension from an original transport roller with respect to a transport speed of a transport roller in common to the recording sheet and the original. <P>SOLUTION: From the upstream side in the transport direction, a feeding means 602 for separately feeding a stacked sheet; a first transport means 100 for transporting the original to a read means; the read means 28 for reading the original; a second transport means 10 applying subscanning to the recording sheet; a recording means 1 for recording an image; and a paper discharge means 17 for discharging the sheet are arranged in this order, the transport speed of the first transport means is selected faster than that of the second transport means, or the first transport means is coupled to a common drive source 20 via a drive switching means 105. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an image reading and recording apparatus such as a facsimile, which is integrally provided with a recording means for recording on a recording sheet and a reading means for reading a document.

  In an image reading and recording apparatus such as a facsimile which is integrally provided with a recording means for recording on a recording sheet and a reading means for reading an original, when the apparatus is to be downsized due to market demands, etc. It is conceivable to share the document transport path. According to this, for example, the configuration is such that the feeding roller and paper discharge roller used for document conveyance, the drive motor for document conveyance, and the like are deleted. With such an apparatus configuration, it is possible to reduce the size and cost of the image reading and recording apparatus.

In the image reading and recording apparatus having the common conveyance path as described above, the recording sheet and the document guided to the common conveyance path may be fed by different feeding units, respectively, for the sake of downsizing. Are preferably fed by the same feeding means. Further, it is desirable that the reading sensor for reading the image information on the document is fixedly arranged on a common conveyance path. However, when the reading sensor is fixedly arranged, the reading sensor has a common transport to eliminate the influence of ink mist generated during the recording operation and to eliminate image recording on the platen that occurs when paper feeding fails. It is desirable to arrange in front (upstream side) of the roller (for example, see Patent Document 1).
JP-A-7-183990

  However, if the reading sensor is arranged on the upstream side of the common conveyance roller, the conveyance accuracy during the reading operation is affected by the paper feed roller, and the read image becomes unstable. In order to eliminate such inconvenience, it is conceivable to stabilize the reading accuracy by adding a document transport roller on the upstream side of the reading sensor. However, a common conveyance roller that controls conveyance accuracy when recording on a recording sheet needs to convey one line of feed with high accuracy. When a document conveyance roller is added, a common conveyance roller on the downstream side is connected to the upstream side. As a result, a back tension is received from the document transport roller on the side, and the content of the recorded image is disturbed.

  The present invention has been made in view of such a technical problem, and an object of the present invention is to eliminate the effect of back tension from the document conveying means on the conveying speed of the common conveying means, and a recording sheet. Another object of the present invention is to provide an image reading and recording apparatus capable of reducing the size and cost of the apparatus while ensuring the document conveyance accuracy.

  In order to achieve the above object, an image reading and recording apparatus according to the present invention includes a recording unit for recording on a recording sheet, a reading unit for reading a document, and a stack for supplying the recording sheet or the document to the recording unit or the reading unit. A sheet feeding unit that sequentially feeds sheets from the top of the sheet; a first conveyance unit that is disposed upstream of the reading unit; a second conveyance unit that is disposed upstream of the recording unit; and a recording sheet Or a discharge unit for discharging the document, and is arranged in the order of the feeding unit, the first transfer unit, the reading unit, the second transfer unit, the recording unit, and the discharge unit from the upstream in the transfer direction. The conveying speed of the conveying means is set faster than the conveying speed of the second conveying means.

  In order to achieve the above object, another image reading and recording apparatus according to the present invention provides a recording means for recording on a recording sheet, a reading means for reading an original, and a recording sheet or an original for supplying the recording means or the reading means. A feeding unit that sequentially feeds the stacked sheets from the uppermost one, a first conveying unit disposed on the upstream side of the reading unit, a second conveying unit disposed on the upstream side of the recording unit, A discharge unit for discharging the recording sheet or the document, and is arranged in the order of the feeding unit, the first transfer unit, the reading unit, the second transfer unit, the recording unit, and the discharge unit from the upstream in the transfer direction, The first transport unit is connected to a drive source through a drive switching unit that selectively switches presence / absence of drive transmission.

  According to the present invention, it is possible to eliminate the effect of the back tension from the document conveying unit with respect to the conveyance speed of the common conveying unit, and it is possible to reduce the size and cost of the apparatus while ensuring the conveyance accuracy of the recording sheet and the document. An image reading and recording apparatus that can be realized is provided.

  Embodiments of the present invention will be specifically described below with reference to the drawings. Note that the same reference numerals denote the same or corresponding parts throughout the drawings. The image reading and recording apparatus according to the present embodiment has a recording function for recording an image on a recording sheet as a recording medium and a reading function for reading an image of a document, and the recording function is provided on a conveyance path common to the recording sheet and the document. And a reading unit having a reading function. FIG. 1 is a schematic longitudinal sectional view showing a configuration of an embodiment of an image reading and recording apparatus according to the present invention. 2 is a schematic perspective view of the image reading and recording apparatus of FIG. 1 from the upper right side, and FIG. 3 is a schematic perspective view of the image reading and recording apparatus of FIG.

  First, the overall configuration will be described with reference to FIGS. 1 to 3, a guide rail for reciprocating (main scanning) a carriage 4 carrying a recording head (a cartridge in the present embodiment) 1 serving as recording means in the chassis 7 of the recording unit 46 is provided. 7a is provided. A control board 500 for controlling the entire apparatus is mounted on the rear surface of the chassis 7. FIG. 8 is a block diagram showing the control board 500 and each functional unit connected to the board. In FIG. 8, the control board 500 performs reading of an image by a drive motor 20 for conveying a sheet (recording sheet and document), a carriage drive motor 33, a speaker (not shown), an operation unit 508, and a cable (not shown). The reader 28 is connected to a power source 505, a telephone 506, a line connection NCU 504, and the like.

  1 to 3, further behind the control board 500, a base member 35 for stacking the recording sheets 2 and the originals 12, and a paper feed tray 8 for assisting the stacking of the recording sheets 2 and the originals 12. A feeding unit (sheet feeding unit) 602 for separating and feeding the recording sheet and the document is provided. Further, the recording sheet 2 and the document 12 which are stacked sheets are stacked by being separated by a separator 102 which is detachably attached to the pressure plate 9. In view of general usage conditions, it is preferable that the document 12 can be set in front of the apparatus (upper side) than the recording sheet 2. In the present embodiment, the document 12 is stacked on the upper surface side of the separator 102. The separator 102 is provided with a slider 114 that can move in the left-right direction according to the size of the document.

  A sheet (recording sheet 2 or document 12) separated and fed by a feeding unit (feeding unit) 602 is held by a first conveyance unit including a first conveyance roller 100 and a pressing roller 101, and a reading unit (reading). Means) is conveyed to 28. The recording sheet 2 or the document 12 that has passed through the reading unit 28 is held by the second conveying unit including the second conveying roller 10 and a plurality of (for example, four) pinch rollers 16 and conveyed to the recording unit 46. The recording sheet 2 recorded by the recording head 1 serving as a recording unit or the document 12 read by the reading unit 28 is discharged out of the apparatus main body by a discharge unit including a discharge roller 17 and a spur 18.

  FIG. 8 is a block diagram showing a control board of the image reading and recording apparatus of FIG. 1 and each functional unit connected to the board. Next, a control system for driving and controlling each unit will be described with reference to FIG. In FIG. 8, reference numeral 500a denotes a control unit mounted mainly on the control board 500 (FIGS. 1 and 2). The control unit 500a includes a power source 505 that rectifies AC commercial power and supplies power to the entire apparatus, a telephone 506, an NCU board 504 that connects lines, a display unit 509 that displays contents input from the operation unit 508, and the original 12 Are connected to the reading unit 28, the drive motor 20, the carriage drive motor 33, and the like. The modular is mounted on the NCU board 504.

  The control unit 500a includes a CPU 500h that controls the entire apparatus, a ROM 500f that stores various programs and various data, and a RAM 500g that is used as a work area for the CPU 500h and temporarily stores various data such as the number of recorded sheets. . The line memory 500b stores an image of each line of the image data. When the document is transmitted or copied, one line of image data from the reading unit 28 is stored. When the image data is received, the line memory 500b is restored. The image data for one line is stored. Then, image recording is performed by outputting various data stored in the line memory 500b to a recording means described later.

  An encoding / decoding unit 500c provided in the control unit 500a encodes image information to be transmitted by MH encoding or the like, decodes the received encoded image data, and converts it into image data. The buffer memory 500d stores transmitted / received encoded image data. In the present embodiment, a constant current type pulse motor is used as the drive motor 20. The drive motor 20 is driven by converting a signal from the output port of the CPU into a phase signal by the motor driver 500j and transmitting this phase signal to the drive motor.

4 is a partial front view schematically showing the standby state of the drive switching means in FIG. 3, and FIG. 5 is a partial side view schematically showing the standby state of the drive switching means in FIG. 6 is a partial front view schematically showing a drive transmission state of the drive switching means in FIG. 3 to the first transport means, and FIG. 7 is a drive transmission of the drive switch means in FIG. 3 to the first transport means. It is a partial side view which shows a state typically.
In this embodiment, the operation of separating and feeding the recording sheet 2 and the document 12 in the feeding unit 602, driving the first transport roller 100, driving the second transport roller 10, driving the feed roller (paper feed roller) 19. The head recovery means 605 is driven by the same drive motor 20.

  That is, the drive when the drive motor 20 rotates in the forward direction can be transmitted to the second transport roller 10 and the feed roller 19 during a recording operation and standby by a drive switching means 105 (FIGS. 4 to 7) described later. In the reading operation, transmission to the first conveying roller 100 is possible. Further, the drive when the drive motor 20 rotates in the reverse direction is transmitted to the head recovery means 605. Mechanically, the forward drive of the drive motor 20 is performed by the drive switching means 105 by the recording drive transmission means 603 (FIGS. 2 and 8) or the first transport roller drive transmission means 111 (or the reading drive transmission means in FIG. 8). 604), and the reverse drive of the drive motor 20 is transmitted to the head recovery means 605 (FIG. 8) via one-way transmission means such as a one-way clutch.

  However, since conveyance of the recording sheet 2 requires high feeding accuracy for each line, the driving torque required for the reading operation and the driving torque required for the recording operation and the recovery operation are different from each other. Therefore, when the reading operation is started, the peak current of the drive motor 20 is switched by sending a High signal (switching signal) from the port of the CPU 500h to the switching circuit 500i and changing the reference current value to the driver 500j. . As a result, it is possible to realize cost reduction by sharing the same drive motor 20 and noise reduction by controlling the current according to the required torque.

  The control unit 500a further includes a PES (Paper Edge Sensor) 21 for detecting the leading and trailing edges of the sheet (recording sheet and document) and an RPS (not shown) that detects the rotational phase of the feeding roller 19. (Roller Position Sensor) and a DS (Document Sensor) (not shown) for detecting the presence or absence of a document are provided.

  Next, the recording means will be described with reference to FIG. The recording head 1 as a recording unit records an image on the recording sheet 2 conveyed by the second conveying roller 10 and the paper discharge roller 17. In this embodiment, a recording head 1 including an ink cartridge for selectively discharging ink from a plurality of discharge ports arranged on the discharge surface based on image data is used as a recording unit. That is, the ink cartridge 1 generates a plurality of fine discharge ports (nozzles), a liquid path leading to each discharge port, an energy action part arranged in a part of each liquid path, and droplet discharge energy in each energy action part Energy generating means is provided.

  Such a configuration using the ink jet recording means is advantageous in terms of downsizing and running cost. However, since the inside of the apparatus may be contaminated with ink due to ink mist generated when ink droplets are ejected, care must be taken in designing the layout. In the present embodiment, in order to avoid inconvenience due to ink mist, the contact image sensor (also referred to as CS) 22 constituting the reading unit 28 is located upstream of the second transport roller 10 and by the chassis 7 of the apparatus. It is disposed at a position that is blocked from the scattered ink. In addition, the reading unit 28 is separated from the image forming surface of the recording sheet 2 in the recording unit 46, so that even when a paper jam or the like occurs in the recording unit 46, troubles in which unfixed ink adheres to the reading surface of the CS 22 or the white reference 25. Can be avoided.

  In an ink jet recording apparatus that records ink by discharging ink from fine discharge ports, image quality due to defective discharge due to the inclusion of bubbles or dust inside the discharge ports, or thickening or sticking of the ink due to evaporation of the ink solvent There is a possibility of deterioration. Therefore, in this embodiment, in order to remove the cause of the ejection failure, the head recovery means 605 for refreshing the ink in the ejection port or cleaning the peripheral portion of the ejection port is provided.

  Next, the recording unit 46 that records an image on the recording sheet 2 by the recording head 1 mounted on the carriage 4 will be described. 1 to 3, the carriage 4 is mounted with the recording head 1 and scans in the width direction of the recording sheet 2, and the guide shaft 60 and the guide rail 7a installed in parallel with each other in the width direction of the apparatus main body. The guide is supported so as to be able to reciprocate along. The carriage 4 is reciprocated by a carriage drive motor 33 via an endless belt-like timing belt that is stretched around a pulley (not shown). In this way, an image is recorded while the recording sheet 2 is main-scanned by the recording head 1 on the carriage 4. Recording in this case is performed by driving the recording head 1 based on image data in synchronization with the movement of the carriage 4.

  When the recording for one line is completed, the recording sheet 2 is fed by a predetermined amount in the transport direction (sub-scanning direction), and then the recording head 1 is driven again in synchronization with the movement of the carriage 4, thereby the next one line. Record minutes of images. Thereafter, the entire recording sheet 2 is recorded by alternately repeating the recording for one line and the paper feed at a predetermined pitch. The recording sheet 2 is fed (conveyed) by rotating the second conveying roller 10 connected to the drive motor 20 by a predetermined amount. If the rotation amount of the second transport roller 10 becomes unstable due to some reason (for example, a defective motor alone), white spots are generated in the image due to excessive rotation amount, or overstrikes (black streaks) due to insufficient rotation amount occur. It may cause image quality degradation. Therefore, high accuracy is required for the conveyance amount (rotation amount) of the second conveyance roller 10.

  Normally, the standby position of the carriage 4 (the position in FIG. 2) is selected at the right end of the guide rail 7a. At this standby position, the discharge surface of the recording head 1 is made of a rubber-like elastic body so that the periphery of the discharge port is not dried. Capping with a cap is performed. The carriage 4 is also stopped at the standby position during the reading operation. Replacement when the ink in the ink cartridge of the recording head 1 runs out is performed by removing the ink cartridge 1 to the near side at the capping position shown in FIGS.

  Next, a feeding unit 602 that separates and feeds the recording sheet 2 and the document 12 one by one will be described. 1 to 3, a base member 35 is provided in the sheet stacking section, and a plurality of recording sheets 2 are stacked on a paper feed tray 8 formed on the base member. The base member 35 is provided with a pressure plate 9 that can rotate around a fulcrum of one end (upper end), and the recording sheet 2 is supported by the pressure plate so as to be urged toward the feeding roller 19. ing. A document tray 11 for loading documents 12 is provided on the front side (upper surface side) of the sheet feed tray 8, and the document 12 on the document tray 11 moves from the recording sheet 2 on the sheet feed tray 8. They are separated by possible separators 102.

  A feeding roller 19 is disposed in the vicinity of the exit of the sheet stacking unit. The feeding roller 19 is a separation feeding roller common to the recording sheet 2 and the document 12. The feed roller 19 is configured by attaching a friction elastic body 19a such as hard rubber to a large-diameter cylindrical portion formed in a part (one place in the present embodiment) of a shaft member 19b molded from plastic. . Both ends of the shaft member 19b of the feeding roller 19 are pivotally supported by the base member 35 so as to be rotatable. One end of the shaft member 19 b is connected to the recording drive transmission means 603 and is connected to the drive motor 20 via the second transport roller 10.

  The pressure plate 9 is positioned between the feed roller 19 and the base member 35 and is pivotally supported by the base member 35 so as to be rotatable. The pressure plate 9 is brought into contact with or separated from the outer peripheral surface of the feeding roller by a cam integrally formed with the feeding roller 19 when the feeding roller rotates in the direction of arrow A in FIG. It has become. The sheet feeding operation of the recording sheet 2 is based on the right side surface of the base member 35 in FIG. A frictional elastic feeding roller 19a is disposed at a substantially center in the width direction of the document 12 (for example, about 136 cm from the reference). For this reason, it is also possible to deal with non-standard sheets such as narrow recording sheets and originals such as A5 size longitudinal feed.

  The feeding roller 19 has a D-shaped cross section. In the standby state shown in FIG. 1, the feeding roller 19 is stopped so that the D-shaped notch faces the recording sheet or the document. When the drive of the drive motor 20 is transmitted to the second transport roller 10 via a drive switching means 105 described later, and further transmitted to the feed roller 19 via the recording drive means 603 (FIG. 2), the feed roller 19 19 rotates. Then, the sheet (recording sheet 2 or the original 12) in contact with the friction elastic body 19a of the feeding roller 19 is blocked by the retard roller 31, but the uppermost sheet in direct contact with the feeding roller (friction elastic body 19a). Only the roller is separated by the frictional force with the feeding roller and is fed over the opposite portion of the retard roller 31 (sent).

  After one rotation of the feeding roller 19, the notch (D-cut portion) retreated from the circumference again faces the recording sheet or the original, and the pressure plate 9 is pushed down by the cam to return to the standby state. For this reason, when the recording sheet 2 or the document 12 is conveyed by the second conveying roller 10, the recording sheet or the document does not come into contact with the feeding roller 19a. Therefore, the recording sheet 2 can be conveyed with high accuracy by the second conveying roller 10 without being affected by back tension or the like. If the recording sheet 2 does not reach the PES 21 even after the paper feeding operation is started, the paper feeding operation is executed again. If the PES still does not turn on, the recording sheet 2 or document transport operation stops with an error, and an error is displayed on the display unit 509.

  Next, the first transport unit arranged on the upstream side of the reading unit 28 will be described. The first conveyance roller 100 constituting the first conveyance unit is a conveyance roller common to the recording sheet 2 and the document 12. The sheet (recording sheet 1 or document 12) separated and fed from the feeding unit 602 is nipped and conveyed by the first conveying roller 100 and the pressing roller 101, and enters the reading unit 28. Here, the first conveyance roller 100 is intended to stabilize the conveyance speed when the reading unit 28 reads. Therefore, the forward rotation drive of the drive motor 20 is transmitted to the first conveying roller 100 only through the drive switching means 105 described later only during the reading operation of reading the document 12 by the reading unit 28. Has been.

  On the other hand, the second conveying means arranged on the downstream side of the reading unit 28 is intended to convey the recording sheet 2 during the recording operation with high accuracy. And the conveyance speed of the above-mentioned 1st conveyance roller 100 is set to the speed faster than the conveyance speed of the 2nd conveyance roller 10 which comprises the said 2nd conveyance means. For this reason, it is possible to eliminate the effect of the back tension from the first conveying roller 100 on the conveying operation (conveying speed) of the second conveying roller 10 that affects the recording accuracy. Therefore, the recording sheet 2 can be conveyed with high accuracy in the recording unit 46, and high-quality image recording is possible. Further, a loop of the recording sheet 2 or the document 12 being transported is formed by the difference in peripheral speed between the first transport roller 100 and the second transport roller 10. By this loop, the document 12 is pressed against the reading surface of a CS (contact image sensor) 22, and thus fluttering of the sheet being conveyed can be prevented. In order to regulate the direction of the loop, guide protrusions such as ribs may be arranged on the conveyance path.

  Next, the configuration and operation of the drive switching unit 105 will be specifically described. In the present embodiment, driving to the first conveyance roller 100 is performed via a drive switching unit 105 as shown in FIGS. 3 to 7, and drive transmission to the first conveyance roller 100 is limited to only during the document reading operation. Then, during this switching drive, the load on the drive motor 20 can be further reduced by the amount corresponding to the drive load on the second transport roller 10. 3 to 7, the drive switching means 105 includes a pendulum 106, a pendulum gear 107, a pendulum regulating member 108, a pendulum regulating member 108, and a transmission gear 109.

  The transmission gear 109 is a gear for transmitting the normal rotation drive of the drive motor 20 to the drive switching means 105, and functions as an input gear of the drive switching means 105. The pendulum gear 107 is a gear (planetary gear) that is pivotally supported by one arm portion of the pendulum 106 and that can mesh with the transmission gear (sun gear) 109 and swing about the axis of the transmission gear. The pendulum restricting member (pendulum restricting means) 108 regulates the swinging of the pendulum 106 in the counterclockwise direction in FIG. 4 during standby and during recording, and the pendulum 106 in the first state as shown in FIG. 6 during reading. A position restricting unit that enables movement to a switching position where the drive can be transmitted to the conveying roller 100 is configured.

  The pendulum 106 pivotally supports the pendulum gear 107 with one arm, and in the normal state (standby and recording), the pendulum 106 abuts the pendulum regulating member 108 with the other arm to drive the first transport roller 100. When the transmission is interrupted and the pendulum restricting member 108 is displaced by the carriage 4 in the switching state (during reading), it swings counterclockwise so that the drive can be transmitted to the first conveying roller 100. In the normal state (standby and recording), the forward drive of the drive motor 20 is transmitted to the second transport roller 10 via the transmission gear 109 and the pendulum gear, and further supplied via the recording drive transmission means 603. The state where transmission to the feed roller 19 is possible.

  As shown in FIGS. 3 to 7, the pendulum regulating member 108, which is a pendulum regulating means, can swing around a rotation center 108 a at the left end of the apparatus body chassis 7 (opposite to the home position of the carriage 4). It is attached. However, an elastic deformation portion 112 is formed at the upper end portion of the pendulum regulating member 108, and the lower end portion 108b of the pendulum regulating member 108 causes the pendulum 106 to swing counterclockwise as shown in FIG. The urging position is held at the blocking position. Therefore, even when the drive motor 20 rotates in the forward direction, the drive is not transmitted to the first transport roller drive transmission means 11 (FIG. 3), and therefore the drive is transmitted to the first transport roller 100. Absent.

  When a reading command is issued from such a state, the carriage 4 moves to the drive switching position (opposite to the home position), and the release projecting from the left end of the carriage 4 as shown in FIGS. When the boss 110 pushes the vicinity of the lower end of the pendulum restricting means 108 toward the outside of the apparatus (in the direction of arrow B in FIG. 7), a gap 113 sufficient to further rotate the pendulum 106 from the abutting position is formed. . In this state, the pendulum gear 107 is connected to the first conveyance roller drive transmission unit 111 (FIG. 3), so that the drive from the drive motor 20 is transmitted to the first conveyance roller 100 via the drive transmission unit 111. It becomes possible.

  As described above, once the drive is transmitted to the first conveying roller 100, the state in which the control of the pendulum control unit 108 is released is maintained unless the drive motor 20 rotates in the reverse direction. In the present embodiment, the carriage 4 is returned to the home position again after the state in which the drive can be transmitted to the first transport roller driving unit 111 in this way. Then, the pendulum 107 can return to a standby state (FIGS. 4 and 5) in which the pendulum 107 is prevented from rotating (swinging) by the pendulum restricting means 108 by reversing the drive motor 20 after the image reading operation is completed. It becomes.

  Next, the sheet conveying operation and the recording operation will be described with reference to FIGS. A sheet conveying unit 49 disposed opposite to the recording unit 46 including the recording head 1 and the like mounted on the carriage 4 includes a platen 3, a second conveying roller 10 supported by the platen, and the second conveying roller 10. A plurality of (for example, four) pinch rollers 16 that are in contact with each other in the sheet width direction, and a pinch roller guide 36 that pivotally supports the pinch rollers 16 so as to press-contact the pinch rollers 16 against the second conveying roller 10; The sheet discharge roller 17, a plurality of spurs 18 that come into contact with the sheet discharge roller, and a spur holder 55 that pivotally supports the spur so as to be pressed against the sheet discharge roller 17. The platen 3 forms a transport support surface that supports the transported sheet from the back surface. The paper discharge roller 17 has a structure in which plastic and elastomer are integrally formed.

  The sheet conveyance unit 49 is a conveyance mechanism common to the recording sheet 2 and the document 12. A plurality of ribs 38 extending in the conveyance direction are formed on the sheet support surface of the platen 3 so that the sheet passes along the upper surface of the ribs. The conveyance direction by the second conveyance roller 10 and the pinch roller 16 is set obliquely downward from the upstream side of the roller to the downstream side, and the conveyance direction by the paper discharge roller 17 and the spur 18 is downstream from the upstream side of the roller. It is set in the diagonally upward direction. As a result, the recording sheet 2 conveyed by the sheet conveying means 49 is stably conveyed in the direction of the arrow P without contacting the sheet support surface of the platen 3 and dancing up and down.

  In the recording operation, one line is recorded by driving the recording head 1 based on the image data in synchronization with the reciprocating movement of the carriage 4, and then the recording sheet 2 is fed by a predetermined pitch. An image is recorded on the entire recording sheet 2 by alternately repeating recording and paper feeding at a predetermined pitch. In the case of inkjet recording, an image is formed by selectively ejecting ink from a plurality of ejection openings arranged on the ejection surface of the recording head based on image information.

  FIG. 9 is a schematic longitudinal sectional view showing a reading unit 28 which is a reading unit of the image reading and recording apparatus according to the present embodiment. Next, the reading operation will be described with reference to FIG. In FIG. 9, the first conveying means (the first conveying roller 100 and the pressing roller 101) is arranged on the upstream side of the reading means 28, and the second conveying means (the second conveying roller 10 and the pinch roller 16) is arranged on the downstream side. Is arranged. Further, a PES (paper edge sensor) 21 is disposed immediately upstream of the first conveying means. The reading unit 28 includes a white reference 25, a CS (contact image sensor) 22, and a CS holder 26. In the present embodiment, since the feeding roller 19 is disposed above the document stacking surface of the document tray 11, the CS 22 has its reading surface facing downward in consideration of the page order during transmission or copying. Has been placed. When the first transport roller 100 transports a predetermined number of steps after the leading edge of the document 12 crosses the PES 21, the image data on the document is read by the CS 22 and the document is further transported to the second transport roller 10 downstream. Transport toward.

  In FIG. 9, the contact image sensor (CS) 22 is accommodated in such a posture that the sensor surface is outside with respect to the recess formed in the CS holder 26, and is fixed to the holder 26 with a fastening member (screw). . The white reference 25 is formed by attaching a white sheet material to a metal plate. This metal plate has a flat surface for attaching a white sheet and both side plates formed by bending both ends in the longitudinal direction. Instead of the white sheet, a metal plate coated with white may be used. A hole is formed in the both side plates, and the white reference 25 is rotatably supported with respect to the CS holder 26 and CS 22 by engaging the shaft portion of the CS holder 26 in the hole (not shown). The white reference 25 is urged toward the CS 22 side by a torsion coil spring.

  A gap is formed between the sensor surface of the CS 22 and the white sheet of the white reference 25 so that at least one document can pass in a state where the white reference 25 is biased with respect to the CS 22. This gap is formed between the CS 22 and the sensor surface by a protrusion provided on the outside in the document width direction. The white reference 25 is biased by a torsion coil spring (not shown). For this reason, the white reference 25 is separated from the CS 22 against the first position (a normal position as shown in FIGS. 1 and 9) facing the CS 22 and the torsion coil spring. A second position rotated in the direction can be taken. The second position of the white reference 25 enables the user to clean the contaminated portion when the white sheet of the white reference 25 or the reading surface of the CS 22 is contaminated by ink scattered from the recording unit 46 or the like. .

  As shown in FIG. 9, the image reading surface of the reading unit 28 includes a nip portion between the first conveying roller 100 and the pressing roller 101 and a nip portion between the second conveying roller 10 and the pinch roller 16. It is arranged at a position shifted upward from the connecting line. For this reason, the document 12 being conveyed is always urged toward the reading surface while being conveyed through the reading unit 28, and as a result, there are inconveniences such as floating and fluttering of the document being read and conveyed. Can be eliminated. Further, the image reading surface of the reading unit 28 may be arranged so as to be shifted downward from a line connecting the nip part of the first conveying unit and the nip part of the second conveying unit. Inconveniences such as floating and fluttering can be eliminated.

  In the above-described embodiment, the case where the recording unit is a serial type recording apparatus that records with a recording head mounted on a carriage has been described as an example. However, the present invention is a line type composed of a full line head or the like. The present invention can be similarly applied to an image reading and recording apparatus of another recording form such as an image reading and recording apparatus using a recording apparatus, and has the same effects. In the above-described embodiment, the case where the recording method of the recording unit (recording apparatus) is an ink jet method has been described as an example. However, the present invention is a thermal transfer method, a thermal method, a laser beam irradiation method, a wire dot method. The present invention can be applied regardless of the recording method, and has the same effect.

  The present invention can be applied in the same manner regardless of the structure and number of recording means (recording heads) and can achieve the same effect. Further, the image reading and recording apparatus according to the present invention is not limited to a single apparatus, but also an image reading and recording apparatus in a composite apparatus combining a copying machine, a facsimile machine, a captured image forming apparatus, etc. The present invention can be widely applied to an apparatus that reads and records image information such as an image reading and recording apparatus as a device, and has the same effects.

1 is a schematic longitudinal sectional view showing a configuration of an embodiment of an image reading and recording apparatus according to the present invention. FIG. 2 is a schematic perspective view of the image reading and recording apparatus of FIG. 1 from the upper right side. FIG. 2 is a schematic perspective view of the image reading and recording apparatus of FIG. 1 viewed from the upper left side. It is a partial front view which shows typically the standby state of the drive switching means in FIG. It is a partial side view which shows typically the standby state of the drive switching means in FIG. FIG. 4 is a partial front view schematically showing a drive transmission state of a drive switching unit in FIG. 3 to a first conveying roller. FIG. 4 is a partial side view schematically showing a drive transmission state of a drive switching unit in FIG. 3 to a first conveying roller. FIG. 2 is a block diagram illustrating a control board and each functional unit connected to the board of the image reading and recording apparatus of FIG. 1. 1 is a schematic longitudinal sectional view showing a reading unit in an embodiment of an image reading and recording apparatus according to the present invention.

Explanation of symbols

1 Recording means (recording head, ink cartridge)
2 Recording sheet (sheet, recording medium)
DESCRIPTION OF SYMBOLS 3 Platen 4 Carriage 7 Chassis 7a Guide rail 8 Paper feed tray 9 Pressure plate 10 2nd conveyance roller (2nd conveyance means)
11 Document tray 12 Document (sheet)
16 Pinch roller 17 Paper discharge roller (paper discharge means)
18 Spur 19 Feed roller (feed roller)
19a Friction elastic body 20 Drive motor 21 PES (page edge sensor)
22 CS (Contact Image Sensor)
25 White reference 26 CS holder 28 Reading means (reading unit)
31 retard roller 33 carriage drive motor 38 rib (supporting surface of platen)
46 recording unit 49 sheet conveying unit 100 first conveying roller (first conveying means)
DESCRIPTION OF SYMBOLS 102 Separator 105 Drive switching means 106 Pendulum 107 Pendulum gear 108 Pendulum restriction member 109 Transmission gear 110 Release boss 111 First conveyance roller drive transmission means 500 Control board 500a Control section 602 Feed means (feed section, paper feed section)
603 Recording drive transmission means 604 Reading drive transmission means

Claims (4)

Recording means for recording on a recording sheet;
Reading means for reading a document;
A feeding unit that sequentially feeds a recording sheet or a document to the recording unit or the reading unit from the top of the stacked sheets;
First conveying means disposed on the upstream side of the reading means;
Second conveying means disposed on the upstream side of the recording means;
A paper discharge means for discharging the recording sheet or the document,
Arranged in the order of feeding means, first conveying means, reading means, second conveying means, recording means, paper discharging means from upstream in the conveying direction,
The image reading and recording apparatus, wherein the conveying speed of the first conveying means is set faster than the conveying speed of the second conveying means. Recording means for recording on a recording sheet;
Reading means for reading a document;
A feeding unit that sequentially feeds a recording sheet or a document to the recording unit or the reading unit from the top of the stacked sheets;
First conveying means disposed on the upstream side of the reading means;
Second conveying means disposed on the upstream side of the recording means;
A paper discharge means for discharging the recording sheet or document,
Arranged in the order of the feeding means, the first conveying means, the reading means, the second conveying means, the recording means, and the paper discharging means from the upstream in the conveying direction,
The image reading and recording apparatus, wherein the first conveying unit is connected to a driving source via a drive switching unit that selectively switches presence / absence of drive transmission.   The reading surface of the original in the reading unit is located at a position shifted above or below a line connecting the nip portion of the first conveying unit and the nip portion of the second conveying unit. 3. The image reading and recording apparatus according to 2.   The image reading and recording apparatus according to claim 1, wherein the feeding unit, the first transport unit, and the second transport unit are driven by the same drive source.

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