JP6051151B2 - Image reading apparatus and image forming apparatus - Google Patents

Description

  The present invention relates to an image reading apparatus and an image forming apparatus.

  Japanese Patent Application Laid-Open Publication No. 2004-228561 discloses an image forming apparatus that moves a carriage to a home position when shifting to a sleep mode. Also in Patent Document 2 below, since the carriage may move due to vibration or the like during the sleep mode, it is possible to move the carriage to the home position in the initialization process (initialization process) when returning from the sleep mode. Has been done.

JP 2008-216527 A JP 2006-010718 A

  By the way, in the above prior art, even when the carriage is moved to the home position when shifting to the sleep mode, the carriage is homed in the initialization process even when the carriage is returned from the sleep mode. There is a problem that it takes time to start reading a document as much as it is performed.

  The present invention has been made in view of the above-described circumstances, and an object thereof is to shorten the time of initialization processing when returning from the sleep mode.

An image reading apparatus according to an aspect of the present invention is provided with a document table, a document pressing cover provided on the top surface of the document table so as to be openable and closable, and reciprocally movable in a sub-scanning direction. A reading unit having a carriage that irradiates the read document with reading light and receives reflected light of the reading light, and a carriage home position and a document size reading position, and the carriage is located at the home position. In this case, a detection signal of the carriage is output, and when the carriage is positioned closer to the document size reading position than a predetermined position between the home position and the document size reading position, a carriage detection unit for outputting a non-detection signal, and a receiving unit that receives a command for reading the original document, or the document pressing cover is open, or It is to detect whether the closed state, comprising a detection unit for detecting an operation on which a document is set in the image reading apparatus, and a control unit for controlling the operation of said carriage, wherein, sleep When shifting to the mode, the carriage is moved to the home position, and when the initialization process at the time of returning from the sleep mode is executed, the carriage is kept stopped, and after the initialization process is completed, the receiving unit Receives a document reading instruction, or when the detection unit detects that the document pressing cover is open, a signal output from the carriage detection unit is confirmed, and the carriage detection unit When the carriage detection signal is output from the image, the carriage is moved to the document size reading position side. A winding device.

  An image forming apparatus according to another aspect of the present invention is an image forming apparatus including the image reading device and an image forming unit.

  According to the image reading apparatus and the image forming apparatus according to one aspect of the present invention, the carriage detection unit outputs an on-state signal when the carriage is at the home position, and the carriage reads the home position and the document size. When the position is closer to the document size reading position than a predetermined position, the signal in the off state is output. The control unit receives the document reading instruction after completing the initialization process, or detects the operation of setting the document in the image reading apparatus, and when the carriage is detected by the carriage detection unit, The carriage is moved toward the document size reading position.

  Since the position of the carriage can be specified when switching from the state in which the carriage is detected by the carriage detection unit to the state in which the carriage is not detected, the carriage is moved to the home position in the initialization process when returning from the sleep mode (homing) Even when the processing to be performed is omitted, the carriage can be moved to the document size reading position or the flow reading position. In the initialization process when returning from the sleep mode, the process of moving the carriage to the home position can be omitted, so the time required for the initialization process when returning from the sleep mode can be shortened.

FIG. 2 is a functional block diagram of a multifunction peripheral according to an embodiment of the present invention. 1 is an external view of a multifunction peripheral according to an embodiment of the present invention. It is a top view of the operation display part in one Embodiment of this invention. (A) And (B) is a figure which shows the machine structure of the image reading apparatus in one Embodiment of this invention. It is a schematic diagram which shows the machine structure inside the reading part in one Embodiment of this invention. It is a schematic diagram which shows the machine structure of the image forming part in one Embodiment of this invention. 6 is a flowchart illustrating an operation of the multifunction peripheral according to the embodiment of the present invention. 6 is a flowchart illustrating an operation of the multifunction peripheral according to the embodiment of the present invention. 6 is a flowchart illustrating an operation of the multifunction peripheral according to the embodiment of the present invention. 6 is a flowchart illustrating an operation of the multifunction peripheral according to the embodiment of the present invention. 6 is a flowchart illustrating an operation of the multifunction peripheral according to the embodiment of the present invention. 6 is a flowchart illustrating an operation of the multifunction peripheral according to the embodiment of the present invention. (A-1), (A-2), (B-1), (B-2), (C-1), (C-2), (D-1), and (D-2) are It is a figure which shows each position of the carriage in one Embodiment of this invention.

  A multifunction machine 1 (image forming apparatus) according to the present embodiment is an image forming apparatus that forms an image on recording paper based on an electrophotographic system. As illustrated in FIGS. A forming unit 4, an operation display unit 5, a control unit 6, a communication unit 7, and an image data storage unit 8 are provided. The multifunction device 1 has a function of shifting to a sleep mode in which power is supplied only to the minimum necessary components when an instruction for a predetermined time is not received from the outside under the control of the control unit 6.

  The operation display unit 5 includes an operation display control unit 51, an operation key 52 that is a hardware key, an LCD touch panel 53 that displays software keys and various images. The operation display control unit 51 is a control device that controls the operation keys 52 and the LCD touch panel 53 under the control of the control unit 6.

As shown in FIG. 3, the operation key 52 is physically provided in the operation display unit 5 as a hardware key. For example, the operation key 52 includes a power key 52 a , a start key 52 b , a stop / clear key, and a numeric keypad ( Numeric input keys). The power key 52 a is when the MFP 1 is in sleep mode, an operation key for accepting an instruction to the MFP 1 is returned from the sleep mode to the normal mode. The start key 52b is an operation key for accepting an execution instruction such as copying.

The image reading apparatus 2 includes an ADF (Automatic Document Feeder) 20 and a reading unit 30 as shown in FIGS. 1, 2, and 4A. The image reading apparatus 2 reads the document MS conveyed by the ADF 20 or the document MS placed on the reading unit 30 based on a control signal input from the control unit 6. Document image data obtained by the reading is stored in the image data storage unit 8.

  The ADF 20 is provided on the upper surface of the reading unit 30 so as to be opened and closed by a hinge or the like. The ADF 20 feeds a plurality of documents MS placed on the document feed tray 22 one by one and conveys them to a document image reading position. The ADF 20 functions as a document pressing cover when reading the document MS placed on the reading unit 30. As shown in FIG. 4A, the ADF 20 includes a platen cover 21, a document feed tray 22, a document set detection unit 23, a pickup roller 24, a conveyance roller 25, a registration roller 26, a discharge roller 27, and a document discharge tray 28. And an ADF open / close detection unit 29.

  The document set detection unit 23 detects the leading edge of the document MS set on the document feed tray 22 and outputs a detection signal indicating the detection result to the control unit 6.

  A reading opening OP is formed between the registration roller 26 and the paper discharge roller 27 as shown in FIG. The reading opening OP is a belt-like opening, and is provided at a bottom portion of the ADF 20, that is, at a portion facing the flow reading position of the reading unit 30 with a predetermined width in the sub-scanning direction (document transport direction). The surface of the document MS conveyed by the ADF 20 is exposed toward the reading unit 30 in the reading opening OP.

  The document discharge tray 28 is a storage unit that stores the document MS supplied from the paper discharge roller 27. The ADF open / close detection unit 29 detects whether the ADF 20 is open or closed as a document pressing cover, and outputs a detection signal to the control unit 6.

  As shown in FIGS. 4A, 4 B, and 5, the reading unit 30 includes a first platen glass 31 (original table), a second platen glass 32 (original plate), and a white reference plate 33. A carriage 34, a condenser lens 36, a CCD (Charge Coupled Device) sensor 37, and a carriage detector 38. The reading unit 30 reads the document MS conveyed by the ADF 20 or the document MS placed on the second platen glass 32 by the user.

  The white reference plate 33 is a white plate provided between the first platen glass 31 and the second platen glass 32. The white reference plate 33 is read at the time of shading correction, and the read image data is used for the shading correction as white reference data.

  The carriage 34 includes an LED (Light Emitting Diode) 34A that is a light source and a plurality of mirrors that reflect the reading light reflected by the document MS toward the CCD sensor. The carriage 34 is provided so as to be reciprocally movable along the rail in the sub-scanning direction. As shown in FIG. 4B, the carriage 34 is provided with a light shielding plate 34B at one end (back side) in the main scanning direction. The light shielding plate 34B is provided to detect the position of the carriage 34 by a carriage detection unit 38 (PI (Photo Interrupter) sensor) described later. The light shielding plate 34 </ b> B is provided so as to pass between the light emitting unit 38 </ b> A and the light receiving unit 38 </ b> B provided in the carriage detection unit 38 so as to face each other in the vertical direction as the carriage 34 moves.

  The carriage 34 moves to various positions. For example, the carriage 34 moves to the home position HP of the carriage 34 shown in FIG. 5 when shifting to the sleep mode.

  In addition, when reading the document MS placed on the second platen glass 32, the carriage 34 moves to the document size reading position SP shown in FIG. 5 in order to read the size of the document MS in the main scanning direction. To do. The document size reading position SP is located in the right direction (forward movement direction) in the sub-scanning direction of the carriage 34 with respect to the home position HP.

  Thereafter, the carriage 34 irradiates the reading light toward the document MS while moving rightward in the sub-scanning direction below the second platen glass 32 in order to read the document MS after returning to the home position HP once. . As a result, the reading light sequentially obtained from the document MS is reflected by the plurality of mirrors of the carriage 34 and enters the condenser lens 36.

  Further, the carriage 34 moves to the flow reading position RP shown in FIG. 5 when the document MS is conveyed from the ADF 20. That is, the carriage 34 is fixed below the first platen glass 31 when reading the document MS conveyed by the ADF 20.

  The condensing lens 36 condenses the reading light incident from the mirror and forms an image on the light receiving surface of the CCD sensor 37. The CCD sensor 37 photoelectrically converts the received reading light into an electrical signal.

  The carriage detection unit 38 is provided between the home position HP and the document size reading position SP described above and on the back side of the light shielding plate 34 </ b> B provided on the carriage 34. The carriage detection unit 38 is a PI sensor provided so that the light emitting unit 38A and the light receiving unit 38B face each other vertically. The carriage detection unit 38 detects the light shielding plate 34B passing between the light emitting unit 38A and the light receiving unit 38B as the carriage 34 moves, and outputs a detection signal indicating the detection result to the control unit 6. For example, when the light shielding plate 34B is positioned between the light emitting unit 38A and the light receiving unit 38B, the carriage detection unit 38 outputs an on-state signal as a detection signal, while the light shielding plate 34B is used as the light emitting unit. If it is located out of the space between 38A and the light receiving part 38B, an off-state signal is output. The carriage detector 38 outputs an on-state signal to the controller 6 when the carriage 34 is located at the home position HP. Further, when the carriage 34 is located on the side of the document size reading position SP with respect to a predetermined position between the home position HP and the document size reading position SP, the carriage detection unit 38 sends an off state signal to the control unit 6. Output to.

  As shown in FIG. 6, the image forming unit 4 forms a toner image based on the image data on the recording paper P taken out from the paper feed cassette.

  The communication unit 7 communicates with an external multifunction device 1 or a facsimile apparatus via a telephone line, or a client computer via a LAN (Local Area Network).

  The control unit 6 includes a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), an interface circuit, and the like. The controller 6 controls various operations of the multi-function device 1 by performing various arithmetic processes based on various arithmetic control programs stored in the ROM and communicating with the respective units. Although details will be described later, the control unit 6 performs an initialization process (initialization process) when returning from the sleep mode as part of various control processes.

Next, the operation of the MFP 1 configured as described above will be described with reference to FIGS. For example, users attempting to copy the document MS, when the MFP 1 is in sleep mode, in order to the MFP 1 is returned from the sleep mode to the normal mode, pressing the power key 52 a.

Here, the control unit 6 performs the following characteristic processing when returning from the sleep mode to the normal mode. First, the control unit 6 determines whether it has accepted the return instruction by the power key 52 a is depressed (step S1). If the return instruction has not been received (NO in step S1), control unit 6 returns to the process in step S1.

  On the other hand, when receiving a return instruction (YES in step S1), the control unit 6 executes an initialization process for returning from the sleep mode to the normal mode, but executes the initialization process while the carriage 34 is stopped. (Step S2). In other words, the control unit 6 keeps the carriage 34 stopped when executing the initialization process. If the carriage 34 does not move due to vibration or the like during the sleep mode, the carriage 34 is positioned at the home position HP as shown in FIGS.

  Thus, in the present embodiment, since the process (homing) for moving the carriage 34 to the home position HP is not performed in the initialization process when returning from the sleep mode, the time required for the initialization process can be shortened.

  Subsequently, when the initialization process is completed, the LCD touch panel 53 displays that the initialization process has been completed, and waits in the normal mode (step S3).

Then, the control unit 6 determines whether it has accepted a copy instruction (read instruction) by the start key 52 b is depressed (step S4). When the control unit 6 receives a copy instruction (YES in step S4), whether the document MS is set on the document feed tray 22 of the ADF 20 based on the detection signal input from the document set detection unit 23 of the ADF 20 It is determined whether or not (step S5).

  When the document MS is set on the document feed tray 22 of the ADF 20 (YES in step S5), the control unit 6 determines whether or not the detection signal input from the carriage detection unit 38 is on. (Step S6). When the detection signal input from the carriage detection unit 38 is in an on state (YES in step S6), the control unit 6 detects that the light shielding plate 34B provided on the carriage 34 is detected by the carriage detection unit 38. If it is, the carriage 34 is moved rightward (forward direction) toward the document size reading position SP (step S7).

  When the carriage 34 moves toward the document size reading position SP, the signal output from the carriage detection unit 38 eventually switches from the detection signal of the carriage 34 to the non-detection signal. At the time when the signal output from the carriage detector 38 switches from the detection signal of the carriage 34 to the non-detection signal, the carriage 34 is at a predetermined position between the home position HP and the document size reading position SP. For this reason, since the control unit 6 can specify the position of the carriage 34, the process of moving the carriage 34 to the home position HP (homing) is omitted in the initialization process when returning from the sleep mode. However, the carriage 34 can be moved to the document size reading position SP and the flow reading position RP.

  Then, the control unit 6 determines whether or not the detection signal input from the carriage detection unit 38 has been turned off when the carriage 34 has moved a predetermined distance (step S8). Here, the predetermined distance is a distance from the home position HP to a predetermined position at which the detection signal output from the carriage detection unit 38 switches from the on state to the off state. The carriage 34 is located at the home position HP if it is not moved by vibration or the like during the sleep mode. In this case, the carriage detection unit 38 outputs an off state detection signal. On the other hand, when the carriage 34 is moved from the home position HP due to vibration or the like in the sleep mode, even when the carriage 34 is moved by a predetermined distance, the carriage detection unit 38 detects the off state. May be output.

  When the detection signal input from the carriage detection unit 38 is turned off (YES in step S8), the control unit 6 does not detect the light shielding plate 34B provided on the carriage 34 by the carriage detection unit 38. If it has moved to the position, the carriage 34 is continuously moved to the right in the sub-scanning direction, and when the reading line RL of the carriage 34 moves to the document size reading position SP, the movement of the carriage 34 is stopped (step S9). The control unit 6 uses a stepping that is a drive source based on the timing (see FIGS. 13B-1 and 13B-2) when the detection signal input from the carriage detection unit 38 changes from the on state to the off state. Based on the number of pulses of the motor, the time point at which the reading line RL of the carriage 34 reaches the document size reading position SP shown in FIGS. 13C-1 and 13C-2 can be specified. It can be stopped at the size reading position SP.

  Subsequently, the control unit 6 starts the movement of the carriage 34 from the document size reading position SP toward the reading position RP in the left direction (reverse movement direction). When the reading line RL of the carriage 34 moves to the flow reading position RP, the movement of the carriage 34 is stopped (step S10). Based on the number of pulses of the stepping motor, which is a driving source, the control unit 6 sets the reading line RL of the carriage 34 as shown in FIGS. 13D-1 and 13D-2 based on the document size reading position SP. Since the time point at which the position RP is reached can be specified, the carriage 34 can be flown and stopped at the reading position RP.

  Then, following the process of step S10, the control unit 6 sequentially carries the document MS to the ADF 20 and performs the process of causing the reading unit 30 to read the document MS conveyed by the ADF 20 (step S11). When the reading of all the originals MS is completed, the control unit 6 moves the reading line RL of the carriage 34 to the home position HP (Step S12). Based on the number of pulses of the stepping motor, which is the driving source, with reference to the flow reading position RP, the control unit 6 sets the reading line RL of the carriage 34 to the home position HP shown in FIGS. 13A-1 and 13A-2. Therefore, the carriage 34 can be stopped at the home position HP.

  Then, the control part 6 determines whether it transfers to sleep mode by not receiving the instruction | indication for predetermined time from the outside (step S13). When the control unit 6 determines not to enter the sleep mode (NO in step S13), the control unit 6 returns to the process of step S4 described above. On the other hand, if the control unit 6 determines to shift to the sleep mode (YES in step S13), the control unit 6 shifts to the sleep mode and ends the process.

  On the other hand, when the detection signal input from the carriage detection unit 38 is not in the on state (NO in step S6), the control unit 6 determines that the light shielding plate 34B is the carriage detection unit 38. When it is located away from between the light emitting unit 38A and the light receiving unit 38B, the first carriage position confirmation process (see FIG. 11) is executed. That is, moving leftward (backward movement) until the light shielding plate 34B is detected by the carriage detection unit 38, and moving rightward (forward movement) until the light shielding plate 34B is not detected by the carriage detection unit 38. Repeatedly, the position information of the carriage 34 is corrected.

  First, in the first carriage position confirmation process, the control unit 6 is positioned such that the light shielding plate 34B is separated from between the light emitting unit 38A and the light receiving unit 38B of the carriage detection unit 38 (carriage detection unit 38). The carriage 34 (located on the right side) is started to move leftward in the sub-scanning direction (step S61). Subsequently, the control unit 6 determines whether or not the detection signal input from the carriage detection unit 38 has been turned on (the light shielding plate 34B is positioned between the light emitting unit 38A and the light receiving unit 38B). (Step S62).

  When the detection signal input from the carriage detection unit 38 is not in the on state (is still in the off state) (in the case of NO in step S62), the control unit 6 returns to the process of step S62, and the detection signal is The carriage 34 is continuously moved to the left in the sub-scanning direction until it is turned on. On the other hand, when the detection signal input from the carriage detection unit 38 is turned on (YES in step S62), the control unit 6 starts moving the carriage 34 to the right in the sub-scanning direction (step S63). ).

  Subsequently, the control unit 6 determines whether or not the detection signal input from the carriage detection unit 38 is in an off state (a state in which the light shielding plate 34B is positioned away from between the light emitting unit 38A and the light receiving unit 38B). Determination is made (step S64). When the detection signal input from the carriage detection unit 38 is not in the OFF state (is still in the ON state) (NO in step S64), the control unit 6 returns to the process in step S64, and the detection signal is The carriage 34 is continuously moved rightward in the sub-scanning direction until it is turned off. On the other hand, when the detection signal input from the carriage detector 38 is turned off (YES in step S64), the controller 6 starts moving the carriage 34 to the left in the sub-scanning direction (step S65). ).

  Subsequently, the control unit 6 determines whether or not the detection signal input from the carriage detection unit 38 has been turned on (step S66). When the detection signal input from the carriage detection unit 38 is not in the on state (is still in the off state) (NO in step S66), the control unit 6 returns to the process of step S66 and the detection signal is The carriage 34 is continuously moved to the left in the sub-scanning direction until it is turned on. On the other hand, when the detection signal input from the carriage detection unit 38 is turned on (YES in step S66), the control unit 6 starts moving the carriage 34 to the right in the sub-scanning direction (step S67). ).

  Subsequently, the control unit 6 determines whether or not the detection signal input from the carriage detection unit 38 has been turned off (step S68). If the detection signal input from the carriage detection unit 38 is not in the OFF state (is still in the ON state) (NO in step S68), the control unit 6 returns to the process in step S68, and the detection signal is The carriage 34 continues to move to the right in the sub-scanning direction until it is turned off. On the other hand, when the detection signal input from the carriage detection unit 38 is turned off (YES in step S68), the control unit 6 corrects the position information of the carriage 34. That is, the number of pulses of the stepping motor that is the drive source at the timing when the detection signal input from the carriage detection unit 38 changes from the on state to the off state is stored (step S69).

  On the other hand, when the detection signal input from the carriage detection unit 38 is not in the off state (NO in step S8), that is, the control unit 6 moves the carriage 34 by a predetermined distance in the process of step S8 described above. If the detection signal input from the carriage detection unit 38 is not turned off, the carriage 34 was not at the home position HP when returning to the sleep mode, so the second carriage position confirmation process (FIG. 12). In other words, moving rightward (forward movement) until the carriage 34 is no longer detected by the carriage detector 38 and moving leftward (return) until the light shielding plate 34B is detected by the carriage detector 38. Repeatedly, the position information of the carriage 34 is corrected.

  First, in the second carriage position confirmation process, the control unit 6 moves the carriage 34 in which the light shielding plate 34B is located between the light emitting unit 38A and the light receiving unit 38B of the carriage detecting unit 38 to the right in the sub-scanning direction. Starts to move (step S71). Subsequently, the control unit 6 determines whether or not the detection signal input from the carriage detection unit 38 is in an off state (a state in which the light shielding plate 34B is positioned away from between the light emitting unit 38A and the light receiving unit 38B). Determination is made (step S72).

  If the detection signal input from the carriage detection unit 38 is not in the OFF state (is still in the ON state) (NO in step S72), the control unit 6 returns to the process in step S72, and the detection signal is The carriage 34 is continuously moved rightward in the sub-scanning direction until it is turned off. On the other hand, when the detection signal input from the carriage detection unit 38 is turned off (YES in step S72), the control unit 6 starts moving the carriage 34 to the left in the sub-scanning direction (step S73). ).

  Subsequently, the control unit 6 determines whether or not the detection signal input from the carriage detection unit 38 has been turned on (the light shielding plate 34B is positioned between the light emitting unit 38A and the light receiving unit 38B). (Step S74). When the detection signal input from the carriage detection unit 38 is not in the on state (is still in the off state) (in the case of NO in step S74), the control unit 6 returns to the process of step S74 and the detection signal is The carriage 34 is continuously moved to the left in the sub-scanning direction until it is turned on. On the other hand, when the detection signal input from the carriage detection unit 38 is turned on (YES in step S74), the control unit 6 starts moving the carriage 34 to the right in the sub-scanning direction (step S75). ).

  Subsequently, the control unit 6 determines whether or not the detection signal input from the carriage detection unit 38 has been turned off (step S76). If the detection signal input from the carriage detection unit 38 is not in the OFF state (is still in the ON state) (NO in step S76), the control unit 6 returns to the process in step S76, and the detection signal is The carriage 34 continues to move to the right in the sub-scanning direction until it is turned off. On the other hand, when the detection signal input from the carriage detection unit 38 is turned off (YES in step S76), the control unit 6 corrects the position information of the carriage 34, that is, input from the carriage detection unit 38. The number of pulses of the stepping motor, which is a drive source at the timing when the detection signal is changed from the on state to the off state, is stored (step S77).

  On the other hand, when the document MS is not set on the document feed tray 22 of the ADF 20 in the process of step S5 described above (NO in step 5), the control unit 6 performs the carriage detection unit as shown in FIG. It is determined whether or not the detection signal input from 38 is in an ON state (a state in which the light shielding plate 34B is located between the light emitting unit 38A and the light receiving unit 38B of the carriage detection unit 38) (step S21).

  When the detection signal input from the carriage detection unit 38 is in the ON state (YES in step S21), the control unit 6 moves the carriage 34 toward the document size reading position SP in the right direction in the sub-scanning direction. Start (step S22). Then, in the control unit 6, the detection signal input from the carriage detection unit 38 is in an off state (a state where the light shielding plate 34B is positioned away from between the light emitting unit 38A and the light receiving unit 38B of the carriage detection unit 38). It is determined whether or not (step S23).

  When the detection signal input from the carriage detection unit 38 is turned off (YES in step S23), the control unit 6 continues to move the carriage 34 to the right in the sub-scanning direction so that the carriage 34 is the document. When moving to the size reading position SP, the carriage 34 stops moving (step S24). For example, the control unit 6 uses the drive source based on the timing when the detection signal input from the carriage detection unit 38 changes from the on state to the off state (see FIGS. 13B-1 and 13B-2). Based on the number of pulses of a certain stepping motor, it is determined that the carriage 34 has moved to the document size reading position SP shown in FIGS. 13C-1 and 13C-2.

  Subsequently, the control unit 6 performs document size detection processing based on the image data output from the CCD sensor 37 to the image data storage unit 8 (step S25). When the document size detection process is completed, the controller 6 moves the carriage 34 to the home position HP (step S26). For example, the controller 6 determines that the carriage 34 reaches the home position HP shown in FIGS. 13A-1 and 13A-2 based on the number of pulses of a carriage drive motor (not shown) with reference to the document size reading position SP. Judge that it has moved.

  The controller 6 performs a process of reading the document MS on the second platen glass 32 after the process of step S26 (step S27). That is, the carriage 34 irradiates light toward the document MS while moving in the right direction of the sub-scanning direction below the second platen glass 32 in order to read the document MS.

  On the other hand, when the detection signal input from the carriage detection unit 38 is not in the on state (NO in step S21), the control unit 6 determines that the light shielding plate 34B is the carriage detection unit 38. When it is located away from between the light emitting unit 38A and the light receiving unit 38B, the first carriage position confirmation process (see FIG. 11) is executed. The control unit 6 determines that the detection signal input from the carriage detection unit 38 is not in the OFF state in the process of step S23 described above (NO in step S23), that is, the light shielding plate 34B is connected to the carriage detection unit 38. If it is located between the light emitting unit 38A and the light receiving unit 38B, the second carriage position confirmation process (see FIG. 12) is executed.

  On the other hand, when the copy instruction is not accepted in the process of step S4 described above (NO in step 4), the control unit 6 is based on the detection signal from the ADF open / close detection unit 29 as shown in FIG. Then, it is determined whether or not the ADF 20 functioning as a document pressing cover is in an open state (step S31). When the ADF 20 is in the open state as the document pressing cover (YES in step S31), the control unit 6 turns on the detection signal input from the carriage detection unit 38 (the light shielding plate 34B is in the carriage detection unit 38). It is determined whether or not the light emitting unit 38A and the light receiving unit 38B are positioned (step S32).

  When the detection signal input from the carriage detection unit 38 is in the on state (YES in step S32), the control unit 6 moves the carriage 34 toward the document size reading position SP in the right direction of the sub-scanning direction. Start (step S33). Then, in the control unit 6, the detection signal input from the carriage detection unit 38 is in an off state (a state where the light shielding plate 34B is positioned away from between the light emitting unit 38A and the light receiving unit 38B of the carriage detection unit 38). It is determined whether or not (step S34).

  When the detection signal input from the carriage detector 38 is turned off (YES in step S34), the controller 6 continues to move the carriage 34 to the right in the sub-scanning direction. When the carriage 34 moves to the document size reading position SP, the movement of the carriage 34 is stopped (step S35). For example, the control unit 6 uses the drive source based on the timing when the detection signal input from the carriage detection unit 38 changes from the on state to the off state (see FIGS. 13B-1 and 13B-2). Based on the number of pulses of a certain stepping motor, it is determined that the carriage 34 has moved to the document size reading position SP shown in FIGS. 13C-1 and 13C-2.

  Subsequently, the control unit 6 determines whether or not the ADF 20 functioning as a document pressing cover is in a closed state based on the detection signal from the ADF open / close detection unit 29 (step S36). If the ADF 20 is not closed (is still open) as the document pressing cover (NO in step S36), the control unit 6 returns to the process in step S36 and waits until the ADF 20 is closed. To do. On the other hand, when the ADF 20 is closed as the document pressing cover (YES in step S36), the control unit 6 performs document size detection processing based on the read image data (step S37).

  When the document size detection process is completed, the control unit 6 moves the carriage 34 to the home position HP (step S38).

Control unit 6, after the process in step S38, the determining whether it has accepted a copy instruction (read instruction) by the start key 52 b is depressed (step S39). If the copy instruction has not been accepted (NO in step S39), the control unit 6 returns to the process of step S39 and waits until the copy instruction is accepted. On the other hand, when receiving a copy instruction (YES in step S39), the control unit 6 moves the carriage 34 from the current position to the right in the sub-scanning direction to move the document MS on the second platen glass 32. A reading process is performed (step S40). That is, the control unit 6 does not perform the process of moving the carriage 34 to the home position HP immediately before reading the document MS on the second platen glass 32. If the carriage 34 does not move due to vibration or the like during the sleep mode, the carriage 34 reads the document MS on the second platen glass 32 as shown in FIGS. 13A-1 and 13A-2. , Located at the home position HP.

  As described above, in the present embodiment, when the original MS on the second platen glass 32 is read, the process of moving the carriage 34 to the home position HP is not performed, so the time until the reading of the original MS can be shortened. .

  On the other hand, when the detection signal input from the carriage detection unit 38 is not in the ON state (NO in step 32), the control unit 6 determines that the light shielding plate 34B is the carriage detection unit 38. When it is located away from between the light emitting unit 38A and the light receiving unit 38B, the first carriage position confirmation process (see FIG. 11) is executed. In addition, the control unit 6 determines that the detection signal input from the carriage detection unit 38 is not in the off state (NO in step S34), that is, the light shielding plate 34B is included in the carriage detection unit 38 in the process of step S34 described above. If it is located between the light emitting unit 38A and the light receiving unit 38B, the second carriage position confirmation process (see FIG. 12) is executed.

  On the other hand, when the ADF 20 is not in the open state as the document pressing cover (NO in step 31), the control unit 6 feeds the document of the ADF 20 based on the detection signal input from the document set detection unit 23 of the ADF 20. It is determined whether or not the document MS is set on the tray 22 (step S51).

  When the document MS is set on the document feed tray 22 of the ADF 20 (YES in step S51), the control unit 6 turns on the detection signal input from the carriage detection unit 38 (the light shielding plate 34B detects the carriage). It is determined whether or not the light emitting unit 38A and the light receiving unit 38B of the unit 38 are positioned (step S52). When the detection signal input from the carriage detection unit 38 is in the on state (YES in step S52), that is, when the light shielding plate 34B is detected by the carriage detection unit 38, the control unit 6 performs stepping (not shown). By controlling a drive source such as a motor, the carriage 34 is started to move rightward toward the document size reading position SP (step S53). Then, in the control unit 6, the detection signal input from the carriage detection unit 38 is in an off state (a state where the light shielding plate 34B is positioned away from between the light emitting unit 38A and the light receiving unit 38B of the carriage detection unit 38). It is determined whether or not (step S54).

  When the detection signal input from the carriage detection unit 38 is turned off (YES in step S54), that is, when the light shielding plate 34B has moved to a position where it is not detected by the carriage detection unit 38, the control unit 6 When the carriage 34 is continuously moved to the right in the sub-scanning direction and the reading line RL of the carriage 34 is moved to the document size reading position SP, the movement of the carriage 34 is stopped (step S55). For example, the control unit 6 uses the drive source based on the timing when the detection signal input from the carriage detection unit 38 changes from the on state to the off state (see FIGS. 13B-1 and 13B-2). Based on the number of pulses of a certain stepping motor, it is determined that the carriage 34 has moved to the document size reading position SP shown in FIGS. 13C-1 and 13C-2.

  Subsequently, the control unit 6 starts moving the carriage 34 leftward from the document size reading position SP toward the flow reading position RP. When the reading line RL of the carriage 34 moves to the flow reading position RP, the carriage 34 moves. The movement is stopped (step S56).

Control unit 6, after the process in step S56, determines whether it has accepted a copy instruction (read instruction) by the start key 52 b is depressed (step S57). If the copy instruction has not been received (NO in step S57), control unit 6 returns to the process of step S57 and waits until the copy instruction is received. On the other hand, when receiving a copy instruction (YES in step S57), the control unit 6 causes the ADF 20 to sequentially convey the original MS, and simultaneously reads the original MS conveyed by the ADF 20 at the current position on the carriage 34. A process for reading the data is performed (step S58).

  That is, the control unit 6 does not perform the process of moving the carriage 34 to the home position HP immediately before reading the document MS conveyed by the ADF 20. If the carriage 34 does not move due to vibration or the like during the sleep mode, as shown in FIGS. 13D-1 and 13D-2, when the original MS conveyed by the ADF 20 is read, the carriage 34 It is located at the reading position RP.

  As described above, in the present embodiment, when the original MS conveyed by the ADF 20 is read, the process of moving the carriage 34 to the home position HP is not performed, so that the time until the reading of the original MS can be shortened.

  On the other hand, when the detection signal input from the carriage detection unit 38 is not in the ON state (NO in step S32), the control unit 6 determines that the light shielding plate 34B is the carriage detection unit 38. When it is located away from between the light emitting unit 38A and the light receiving unit 38B, the first carriage position confirmation process (see FIG. 11) is executed. In addition, the control unit 6 determines that the detection signal input from the carriage detection unit 38 is not in the off state (NO in step S34), that is, the light shielding plate 34B is included in the carriage detection unit 38 in the process of step S34 described above. If it is located between the light emitting unit 38A and the light receiving unit 38B, the second carriage position confirmation process (see FIG. 12) is executed. On the other hand, when the document MS is not set on the document feed tray 22 of the ADF 20 in the process of step S5 described above (NO in step S5), the control unit 6 returns to the process of step S4 described above.

  When the carriage 34 is at the home position HP, the multi-function device 1 according to the present embodiment outputs an on-state signal, and the carriage 34 is a predetermined position between the home position HP and the document size reading position SP. A carriage detection unit 38 is provided that outputs an off-state signal when it is closer to the document size reading position SP. When the multifunction device 1 receives a scan instruction, a copy instruction, or the like and the carriage 34 is detected by the carriage detection unit 38, the multifunction device 1 moves the carriage 34 toward the document size reading position SP.

  Since the multifunction device 1 can specify the position of the carriage 34 when the carriage detection unit 38 switches from the state in which the carriage 34 is detected to the state in which the carriage 34 is not detected, in the initialization process when returning from the sleep mode, the carriage 1 Even when the process of moving (homing) 34 to the home position HP is omitted, the carriage 34 can be moved to the document size reading position SP and the flow reading position RP.

  In addition, when the multifunction device 1 according to the present embodiment receives a scan instruction, a copy instruction, or the like, and performs a process of correcting the position information of the carriage 34 when the carriage 34 is not detected by the carriage detection unit 38.

  The embodiments of the present disclosure have been described above. However, the present disclosure is not limited to the above-described embodiments, and for example, the following modifications can be considered.

  (1) In the above embodiment, homing is omitted on the assumption that the carriage 34 is positioned at the home position HP when the sleep mode is restored. However, the carriage 34 may move during the sleep mode. For this reason, when the reference image in the shading correction is read, there is a possibility that a correct reference image cannot be acquired and the shading correction cannot be normally performed. Therefore, in this embodiment, when performing shading correction, it is necessary to move the carriage 34 to the home position HP after confirming the position of the carriage 34 while moving the carriage 34 to the document size reading position SP.

  (2) In the present embodiment, when the position of the carriage 34 is not normally confirmed when the carriage 34 is confirmed while the carriage 34 is moved to the document size reading position SP, it can be normally confirmed on the LCD touch panel 13. You may make it display that there was no.

DESCRIPTION OF SYMBOLS 1 Multifunction machine 2 Image reader 4 Image forming part 5 Operation display part 6 Control part 20 ADF
21 Platen cover 22 Document feed tray 23 Document set detection unit 29 ADF open / close detection unit 30 Reading unit 31 First platen glass 32 Second platen glass 33 White reference plate 34 Carriage 34A LED
34B Light shielding plate 38 Carriage detector 38A Light emitter 38B Light receiver 51 Operation display controller HP Home position SP Document size reading position RP Flow reading position

Claims (4)

The document table,
A document pressing cover provided on the upper surface of the document table so as to be openable and closable;
A reading unit provided so as to be reciprocally movable in the sub-scanning direction, and having a carriage that irradiates the reading light to the original placed on the original table and receives the reflected light of the reading light;
Provided between the home position of the carriage and the document size reading position, and when the carriage is located at the home position, outputs a detection signal of the carriage, and the carriage detects the home position and the document size reading position. A carriage detection unit that outputs a non-detection signal of the carriage when located on the document size reading position side with respect to a predetermined position between
A reception unit for receiving a document reading instruction;
A detection unit for detecting whether the document is set in the image reading apparatus by detecting whether the document pressing cover is in an open state or a closed state ;
A control unit for controlling the operation of the carriage,
The control unit moves the carriage to the home position when shifting to the sleep mode, and keeps the carriage stopped when executing the initialization process when returning from the sleep mode, and performs the initialization process. After completion, when the receiving unit receives a document reading instruction, or when the detecting unit detects that the document pressing cover is in an open state, a signal output from the carriage detecting unit is confirmed. When the carriage detection signal is output from the carriage detection unit, the image reading apparatus moves the carriage to the document size reading position side. When the receiving unit receives a reading instruction after completing the initialization process, or when the detecting unit detects that the document pressing cover is in an open state, the controller detects from the carriage detecting unit The image reading apparatus according to claim 1, wherein an output signal is confirmed, and processing for correcting position information of the carriage is performed when the carriage detection unit outputs a carriage non-detection signal.   The control unit moves the carriage to the document size reading position side until the carriage non-detection signal is detected from the carriage detection unit, and the carriage detection signal is detected from the carriage detection unit. The image reading apparatus according to claim 2, wherein processing for correcting the position information of the carriage is performed by repeatedly performing the movement of the carriage to the side opposite to the document size reading position. The document table,
A document pressing cover provided on the upper surface of the document table so as to be openable and closable;
A reading unit provided so as to be reciprocally movable in the sub-scanning direction, and having a carriage that irradiates the reading light to the original placed on the original table and receives the reflected light of the reading light;
Provided between the home position of the carriage and the document size reading position, and when the carriage is located at the home position, outputs a detection signal of the carriage, and the carriage detects the home position and the document size reading position. A carriage detection unit that outputs a non-detection signal of the carriage when located on the document size reading position side with respect to a predetermined position between
A reception unit for receiving a document reading instruction;
A detection unit for detecting whether the document is set in the image reading apparatus by detecting whether the document pressing cover is in an open state or a closed state ;
A control unit that controls the operation of the carriage, and an image forming unit that forms an image read on the recording paper by the reading unit,
The control unit moves the carriage to the home position when shifting to the sleep mode, and keeps the carriage stopped when executing the initialization process when returning from the sleep mode, and performs the initialization process. When the reception unit receives a reading instruction after completion, or when the detection unit detects that the document pressing cover is open, the signal output from the carriage detection unit is confirmed, An image forming apparatus that moves the carriage toward the document size reading position when a detection signal of the carriage is output from the carriage detection unit.