JP6459915B2 - Image reading apparatus and image forming apparatus - Google Patents

Description

  The present invention relates to an image reading apparatus and an image forming apparatus, and more particularly to a technique for shortening the time of initialization processing performed at the start of normal operation.

  Some image forming apparatuses wait for an instruction input from an operator in a state where the apparatus is shifted to a sleep mode and a power-off mode in order to save power. When the image forming apparatus is returned from the sleep mode and the power-off mode to the normal operation mode in which the normal operation can be performed, an initialization process including an aging process for enabling the normal operation is performed. In Patent Document 1, the carriage is moved to the white reference acquisition position when shifting to the sleep mode and the energy saving mode, and the carriage is moved to the white reference acquisition position when returning from the sleep mode and the energy saving mode to the normal operation mode. By performing the white reference acquisition operation, it is possible to reduce the carriage movement distance required when executing the initialization process, thereby shortening the initial time.

JP 2007-142759 A

  In the image forming apparatus, the processing to be performed after returning to the normal operation mode differs depending on whether the sleep mode or the power-off mode is recovered. Therefore, in the image forming apparatus disclosed in Patent Document 1, from which mode It is necessary to determine whether to return. In this determination, (1) information indicating a mode before return is acquired by communication with another device, or (2) the mode is set as a mode before return when shifting to the sleep mode or the power-off mode. This is done by storing it in a memory. However, in the case of (1), it takes time to acquire information by communication. In the case of (2), the information stored in the memory is erased when the apparatus is turned off after shifting to the sleep mode or the like. Thus, the above determination becomes impossible. Further, in the technique disclosed in Patent Document 2, if the carriage moves to a position where the HP sensor detects the carriage due to vibration after the transition to the sleep mode, the planned operation cannot be performed. An error occurs.

  The present invention has been made in view of the above-described circumstances, and it is possible to determine whether the mode has returned from the sleep mode or the power-off mode when returning to the normal operation mode without adding a special mechanism. An object is to shorten the time required for the initialization process performed at the time of the return.

An image reading apparatus according to one aspect of the present invention includes a document table and a carriage that can reciprocate in the sub-scanning direction, and is provided on the carriage and irradiates a document placed on the document table. A reading unit that receives reflected light of the light and reads an image of the document; and whether the carriage is positioned at a home position that is a standby position of the carriage during normal operation in a normal operation mode by the image reading apparatus. When the carriage is located at the home position, a detection signal indicating that the carriage has been detected is output, and when the carriage is not located at the home position, the carriage is detected. A carriage detection unit that outputs a non-detection signal indicating that the carriage is not operating, and a control unit that controls a movement operation of the carriage. Parts, when shifting to the image reading apparatus power-off mode, the carriage, and the home position, which is set between the reading position of the original size for the placed the document on the document table The carriage is set between the home position and the standby position at the time of the power-off mode when the image reading apparatus is moved to the standby position at the time of the power-off mode. The controller is moved to a standby position at the time of transition to the sleep mode closer to the home position than a standby position at the time of transition to the power off mode , and the control unit is configured to return the sleep mode and the power off mode to the normal operation mode when returning to the normal operation mode. When the control unit moves the carriage to the home position, the control unit moves the carriage to the waiting position. From the time when the movement is started from the position until the carriage detection unit detects the carriage and outputs the detection signal, the control unit measures the movement distance from the standby position at the time of the sleep mode transition. A predetermined first movement distance required for movement to the home position and a predetermined second movement distance required for movement from the standby position when the power-off mode is shifted to the home position are stored in the storage area in advance. And the control unit determines that the return to the normal operation mode is a return from the sleep mode when it is determined that the measured movement distance matches the first movement distance, When initialization processing at the time of return from the sleep mode is performed and it is determined that the measured moving distance matches the second moving distance, It is determined that the return to the normal operation mode is the return from the power-off mode, and an initialization process at the time of return from the power-off mode is executed, and the control unit has the measured movement distance as the first movement distance. And when it is determined that neither of the second movement distances is applicable, an initialization process at the time of return from the power-off mode is executed .

  An image forming apparatus according to another aspect of the present invention includes the image reading device and an image forming unit that forms an image read by the reading unit on a recording sheet.

  According to the present invention, it is possible to determine whether the sleep mode or the power-off mode has been restored when returning to the normal operation mode without adding a special mechanism, and the time required for the initialization process performed at the time of the return 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 which shows an operation display part. (A) and (B) are diagrams showing a mechanical configuration of a document reading unit. FIG. 2 is a schematic diagram illustrating a mechanical configuration inside a document reading unit. It is a schematic diagram which shows the machine structure of a multifunctional machine. 6 is a flowchart illustrating processing when the MFP is shifted to a sleep mode and a power-off mode. (A) is a diagram showing each standby position in the sleep mode and power-off mode in the sub-scanning direction that is the carriage moving direction, (B) is a diagram showing a state in which the carriage is moved to the standby position in the sleep mode, (C) ) Is a diagram showing a state in which the carriage is moved to the standby position in the power-off mode. (A-1), (A-2), (B-1), and (B-2) are diagrams illustrating the positional relationship between the carriage detection unit and the carriage. (A-1), (A-2), (B-1), and (B-2) are diagrams illustrating the positional relationship between the carriage detection unit and the carriage. 6 is a flowchart illustrating processing when the multifunction device returns from a sleep mode and a power-off mode to a normal operation mode.

  Hereinafter, an image reading apparatus and an image forming apparatus according to the present embodiment will be described with reference to the drawings. FIG. 1 is a functional block diagram of a multifunction peripheral according to an embodiment of the present invention. FIG. 2 is an external view of a multifunction peripheral according to an embodiment of the present invention. FIG. 3 is a plan view showing the operation display unit. 4A and 4B are diagrams showing the mechanical configuration of the document reading unit. FIG. 5 is a schematic diagram illustrating a mechanical configuration inside the document reading unit. FIG. 6 is a schematic diagram showing a machine configuration of the multifunction machine 1.

  A multifunction peripheral (image forming apparatus) 1 according to the present embodiment is an image forming apparatus that forms an image on recording paper by an electrophotographic method. The multifunction machine 1 includes a document reading unit 2, an image forming unit 4, an operation display unit 5, a control unit 6, a communication unit 7, and an image data storage unit 8. The multi-function device 1 is in a normal operation mode in which normal operations such as a copy operation, a scan operation, a fax operation, and a printer operation are performed under the control of the control unit 6 and the minimum necessary when no instruction is received from outside for a certain period of time. The multifunction device 1 is shifted to a sleep mode in which power is supplied only to these components and a power off mode in which the power of the multifunction device 1 is turned off.

  The operation display unit 5 includes an operation display control unit 51, an operation key 52 that is a hardware key, and a display unit 53 that includes a software key and an LCD (liquid crystal display) that displays various images and has a touch panel function. Yes. The operation display control unit 51 is a control device that controls the operation keys 52 and the display unit 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. As the operation keys 52, for example, a power key 52A, a start key 52B, a stop / clear key, a numeric keypad (numerical value input key), and the like are provided. The power key 52A is a key for accepting a switching instruction for switching on / off the power of the multifunction device 1 from the operator. The power key 52A accepts the switching instruction as an instruction to return the multifunction device 1 from the power-off mode to the normal operation mode when the multifunction device 1 is in the sleep mode. The start key 52B is an operation key for accepting execution instructions for various operations such as copying. When the control unit 6 receives an instruction input from the operation key 52 or when an instruction is received from an external device connected to the multifunction device 1 via the communication unit 7, the multifunction device 1 is in the sleep mode. If there is, the normal operation mode is restored from the sleep mode. Further, when receiving the switching instruction for turning on the power of the multifunction device 1 from the power key 52A, the control unit 6 returns the multifunction device 1 from the power-off mode to the normal operation mode.

  The document reading unit 2 includes an automatic document feeder (hereinafter referred to as ADF (Automatic Document Feeder)) 20 and a reading unit 30 as shown in FIGS. The document reading unit 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 transport roller 25, a registration roller 26, a discharge roller 27, a document discharge tray 28, and An ADF open / close detection unit 29 is provided.

  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 operator.

  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 has a shape extending in the main scanning direction. 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 capable of reciprocating in the sub-scanning direction along a rail extending 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 a member for detecting the position of the carriage 34 by a carriage detection unit 38 (PI (Photo Interrupter) sensor) described later. The carriage detection unit 38 is provided with a light emitting unit 38A and a light receiving unit 38B so as to face each other at different positions in the vertical direction. The light shielding plate 34B passes between the light emitting unit 38A and the light receiving unit 38B as the carriage 34 moves.

  The carriage 34 moves to various positions in the sub-scanning direction. 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 FIG. 5 in the sub scanning direction of the carriage 34 with respect to the home position HP.

  After reading the document size, the carriage 34 returns to the home position HP and then moves in the sub-scanning direction (the right direction in FIG. 5) below the second platen glass 32 in order to read the document MS. Reading light is emitted toward the document MS. 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.

  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 image forming unit 4 forms an image of 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 further measures the movement distance of the carriage 34 from each standby position to be described later to the home position HP. The control unit 6 measures the number of pulses output by the control unit 6 to the stepping motor provided in the reading unit 30 as a driving source for the movement operation of the carriage 34 as the movement distance. The control unit 6 may include a timer capable of measuring time, for example, and the moving time of the carriage 34 measured by the timer may be the moving distance.

  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. The control unit 6 performs initialization processing (initialization processing) when returning from the sleep mode as part of various control processing.

  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 carriage detector 38 has an arrangement position at a position closest to the home position HP between the home position HP and the document size reading position SP in the sub-scanning direction. The carriage detection unit 38 is provided at a position that intersects and overlaps the light shielding plate 34B provided in the carriage 34 in the main scanning direction. 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 of the carriage 34 that passes between the light emitting unit 38A and the light receiving unit 38B as the carriage 34 moves, and outputs a signal indicating the detection result to the control unit 6. For example, when the light shielding plate 34B is located between the light emitting unit 38A and the light receiving unit 38B, the carriage detection unit 38 outputs a detection signal indicating that the carriage 34 is at the home position HP, When the light shielding plate 34B is positioned away from between the light emitting unit 38A and the light receiving unit 38B, a non-detection signal indicating that the carriage 34 is not at the home position HP is output. That is, when the carriage 34 is located at the position where the carriage detection unit 38 is disposed, the carriage detection unit 38 outputs the detection signal indicating that the carriage 34 is located at the home position HP to the control unit 6. In addition, the carriage detection unit 38 is configured so that, in the sub-scanning direction, when the carriage 34 is at a position closer to the document size reading position SP than the installation position of the carriage detection unit 38, When the position is on the RP side, the non-detection signal is output to the control unit 6.

  Note that the image reading apparatus according to the embodiment of the present invention includes at least the document table, the reading unit 30, the carriage detection unit 38, and the control unit 6.

  Next, a process at the time of transition to the sleep mode and the power-off mode by the multifunction machine 1 will be described. FIG. 7 is a flowchart illustrating processing when the MFP 1 shifts to the sleep mode and the power-off mode. FIG. 8A shows the standby positions in the sleep mode and the power-off mode in the sub-scanning direction, which is the moving direction of the carriage 34, and FIG. 8B shows the state where the carriage 34 is moved to the standby position in the sleep mode. FIG. 4C shows a state where the carriage 34 is moved to the standby position in the power-off mode. FIGS. 9A-1, A-2, B-1 and B-2 and FIGS. 10A-1, A-2, B-1 and B-2 show carriage detection. FIG. 4 is a diagram showing a positional relationship between a section and a carriage.

  When the control unit 6 shifts the multi-function device 1 to the sleep mode and the power-off mode, the control unit 6 moves the carriage 34 to each standby position set corresponding to each mode and then moves the multi-function device 1 to the sleep mode or the power-off mode. Switch to power off mode. Then, the respective standby positions set corresponding to the respective modes are set at different positions in the sub-scanning direction, as shown in FIG. 8A.

  As shown in FIG. 8A, the standby position WP1 when shifting to the sleep mode and the standby position WP2 when shifting to the power-off mode are positions between the document size reading position SP and the home position HP in the sub-scanning direction. Is set to Further, the standby position WP1 when shifting to the sleep mode is set closer to the home position HP than the standby position WP2 when shifting to the power-off mode.

  Here, it is assumed that the multifunction device 1 is set to the normal operation mode. In this case, the control unit 6 moves the carriage 34 to the home position HP when waiting for operation.

  FIGS. 9A-1 and 9A-2 show the positional relationship between the carriage detector 38 and the carriage 34 when the carriage 34 is located at the home position HP. In this state, the carriage detector 38 detects the front end of the light shielding plate 34B of the carriage 34 in the sub-scanning direction RP, and starts outputting the detection signal (FIGS. 9B-1 and 9B). -2)), the number of pulses output by the control unit 6 as a drive control signal to the stepping motor (provided in the reading unit 30 as a drive source for moving the carriage 34) is predetermined. The carriage 34 has been moved to the position where the first value has been reached.

  For example, when reading the document MS placed on the second platen glass 32, the control unit 6 moves the carriage 34 from the home position HP to the lower side of the second platen glass 32, and the second platen glass 32. The original MS is read by the original reading unit 2 while moving the lower position in the sub-scanning direction.

  When operating in this way, if the control unit 6 determines that the sleep mode transition condition that the instruction display unit 5 and the connected external device do not receive an instruction for a certain period of time is satisfied (YES in S1) As shown in FIG. 8B, the carriage 34 is moved from the home position HP to the standby position WP1 when shifting to the sleep mode (S2). After the carriage 34 has moved to the standby position WP1, the controller 6 shifts the state of the multifunction machine 1 to the sleep mode (S3).

  For example, the control unit 6 moves the carriage 34 from the home position HP toward the document size reading position SP, and when the carriage 34 moves to a position where the carriage detection unit 38 starts outputting the non-detection signal (see FIG. 9 (B-1) (shown in B-2)), the position where the carriage 34 has moved to a position where the number of pulses becomes a predetermined second value is set as the standby position WP1, and the carriage 34 is moved. Stop. FIGS. 10A-1 and 10A-2 show a state in which the carriage 34 has moved to the standby position WP1. 9B-1 and 9B-2, when the carriage 34 moves from the home position HP toward the document size reading position SP, the carriage detection unit 38 outputs the non-detection signal. This indicates the position where output starts.

  On the other hand, when the control unit 6 does not satisfy the sleep mode transition condition (NO in S1), but determines that a switching instruction to turn off the power of the multifunction device 1 is received from the power key 52A (YES in S4). As shown in FIG. 8C, the carriage 34 is moved from the home position HP to the standby position WP2 at the time of shifting to the power-off mode (S5). After the carriage 34 has moved to the standby position WP2, the controller 6 shifts the state of the multifunction machine 1 to the power-off mode (S6). It should be noted that the processing of S1 and S4 is repeated until S1 is YES or S4 is YES (NO in S1, NO in S4). Note that the control unit 6 may shift to the power-off mode when a predetermined period has elapsed since the transition to the sleep mode.

  For example, the control unit 6 moves the carriage 34 from the home position HP toward the document size reading position SP, and when the carriage 34 moves to a position where the carriage detection unit 38 starts outputting the non-detection signal (see FIG. Position at which the carriage 34 has moved to a position where the number of pulses from 9 (B-1) (shown in B-2) becomes a predetermined third value (third value> second value). Is set to the standby position WP2, and the movement of the carriage 34 is stopped. FIGS. 10B-1 and B-2 show a state where the carriage 34 has moved to the standby position WP2.

  Next, processing when the MFP 1 returns from the sleep mode and the power-off mode to the normal operation mode will be described. FIG. 11 is a flowchart illustrating processing when the multifunction device 1 returns from the sleep mode and the power-off mode to the normal operation mode.

  When the state of the multifunction device 1 is the sleep mode or the power-off mode, the control unit 6 instructs to switch on the power by operating the power key 52A, or to execute an operation by operating the start key 52B, for example, copy It is determined whether or not an operation execution instruction has been accepted as a return instruction (S11). If the return instruction has not been received (NO in S11), the control unit 6 continues the determination process.

  On the other hand, when the return instruction is received (YES in S11), the control unit 6 determines whether a detection signal indicating that the carriage 34 is detected is input from the carriage detection unit 38 (S12). Here, when the control unit 6 determines that a non-detection signal indicating that the carriage 34 has not been detected is input from the carriage detection unit 38 (NO in S12), the carriage 34 is moved at this time. Move from the standby position to the home position HP (S13).

  For example, the control unit 6 detects the leading end of the light shielding plate 34B of the carriage 34 in the sub-scanning direction toward the flow reading position RP in the carriage detecting unit 38 and starts outputting the detection signal (FIG. 9B-1). ) (Shown in (B-2)) to move the carriage 34 to the home position HP where the number of pulses is the first value.

  At this time, the control unit 6 measures the pulse number of pulses output to the stepping motor before the carriage 34 moves from the standby position to the home position HP as the movement distance of the carriage 34 (S14).

  The controller 6 determines a predetermined movement distance (number of pulses) T1 required for movement from the standby position WP1 to the home position HP when shifting to the sleep mode, and the distance from the standby position WP2 to the home position HP when shifting to the power-off mode. A predetermined movement distance (number of pulses) T2 required for movement is stored in a built-in storage area or the like. The control unit 6 determines whether the movement distance MT measured in S14 matches the movement distance T1 or the movement distance T2 (S15). Here, “matches the movement distance T1 or the movement distance T2” includes a case where the time is within a predetermined range determined in advance from the movement distance T1 or the movement distance T2.

  When it is determined that the moving distance MT measured in S14 matches the moving distance T1 (YES in S15), the control unit 6 determines that the previous mode is the sleep mode and is necessary when returning from the sleep mode. Initialize processing is executed (S16).

  On the other hand, when it is determined that the movement distance MT measured in S14 matches the movement distance T2 (NO in S15), the control unit 6 determines that the previous mode is the power-off mode, and starts from the power-off mode. The initialization process required at the time of return is executed (S17).

  Note that, even when the control unit 6 determines that the moving distance MT does not correspond to any of the moving distances T1 and T2 (NO in S15), the control unit 6 executes an initialization process required when returning from the power-off mode (S17). ).

  After the execution of the initialization process required when returning from the sleep mode in S16 or the execution of the initialization process required when returning from the power-off mode in S17, if an operation execution instruction is issued in S11, control is performed. The unit 6 causes the multifunction device 1 to execute an operation indicated by the operation instruction, for example, the copy operation.

  On the other hand, when the control unit 6 determines in S12 that the detection signal is input from the carriage detection unit 38 (YES in S12), the carriage 34 is located at any standby position in each of the above modes. Therefore, the carriage 34 is started to move rightward in the sub-scanning direction (direction toward the document size reading position SP) (S21). Subsequently, the control unit 6 determines whether a non-detection signal indicating that the carriage detection unit 38 has not detected the carriage 34 is output (S22).

  The control unit 6 continuously moves the carriage 34 in the right direction of the sub-scanning direction until the non-detection signal is input from the carriage detection unit 38 (NO in S22), and the non-detection signal is received from the carriage detection unit 38. When input is made (YES in S22), this time, the carriage 34 is started to move toward the left in the sub-scanning direction (the direction toward the home position HP) (S23).

  When the control unit 6 determines that the detection signal is input again from the carriage detection unit 38 (YES in S24), the control unit 6 moves the carriage 34 to the home position HP where the number of pulses becomes the first value. The position is set as a home position HP, and the carriage 34 is stopped at the position (S25). Thereafter, the process proceeds to, for example, S17, and an initialization process necessary for returning from the power-off mode is executed.

  As described above, in the present embodiment, whether the multifunction device 1 has returned from the sleep mode or the power-off mode is determined by changing the position at which the carriage 34 waits when shifting to the sleep mode or the power-off mode. The mode before returning to the normal operation mode can be determined according to the movement distance of the carriage 34 from each standby position for each mode to the home position HP, so that the normal operation can be performed without adding a special mechanism. When returning to the mode, it is possible to determine whether the mode has returned from the sleep mode or the power-off mode, and the time required for the initialization process performed at the time of the return can be shortened.

  In this embodiment, whether the multifunction device 1 has returned from the sleep mode or the power-off mode is obtained by (1) acquiring information indicating the mode before the return by communication with another device, or (2 ) When shifting to the sleep mode or the power-off mode, it is determined whether or not the mode is stored in the memory as a mode before returning, so that it takes time to acquire information by communication, or the sleep mode or the like is entered. When the power of the apparatus is turned off after the transition, the information stored in the memory is erased and the above determination cannot be made.

  The present invention is not limited to the configuration of the above embodiment, and various modifications can be made. For example, in the above-described embodiment, the image forming apparatus according to an embodiment of the present invention has been described using a multifunction peripheral. However, this is merely an example, and other image forming apparatuses such as a printer and a copier are used. It doesn't matter.

  Moreover, in the said embodiment, the structure and process which were shown by the said embodiment using FIG. 1 thru | or FIG. 11 are only one Embodiment of this invention, and are not the meaning which limits this invention to the said structure and process.

DESCRIPTION OF SYMBOLS 1 Multifunction device 2 Document reading part 4 Image forming part 5 Operation display part 6 Control part 34 Carriage 34B Light-shielding plate 38 Carriage detection part 38A Light emission part 38B Light reception part

Claims (2)

The document table,
A reading unit that includes a carriage that can reciprocate in the sub-scanning direction, and that receives the reflected light of the reading light applied to the document placed on the document table and reads the image of the document When,
It is detected whether the carriage is positioned at a home position that is a standby position of the carriage during normal operation in the normal operation mode by the image reading apparatus, and when the carriage is positioned at the home position, A carriage detection unit that outputs a detection signal indicating that the carriage is detected, and outputs a non-detection signal indicating that the carriage is not detected when the carriage is not in the home position;
A control unit for controlling the movement operation of the carriage,
Wherein, when shifting to the image reading apparatus power-off mode, the carriage, set between said home position, and the reading position of the original size for the placed the document on the document table The carriage is set between the home position and the standby position when shifting to the power-off mode when the image reading apparatus is shifted to the standby mode when shifting to the power-off mode. In addition, it is moved to the standby position when shifting to the sleep mode closer to the home position than the standby position when shifting to the power-off mode ,
The control unit moves the carriage from the standby position when the control unit moves the carriage to the home position when returning from the sleep mode and the power-off mode to the normal operation mode. Measure the moving distance from the start time until the carriage detection unit detects the carriage and outputs the detection signal,
The control unit requires a predetermined first moving distance required for movement from the standby position when shifting to the sleep mode to the home position, and movement from the standby position when shifting to the power-off mode to the home position. The predetermined second movement distance is stored in advance in the storage area,
When the control unit determines that the measured movement distance matches the first movement distance, the control unit determines that the return to the normal operation mode is a return from the sleep mode, and returns from the sleep mode. If the measured movement distance is equal to the second movement distance, it is determined that the return to the normal operation mode is the return from the power-off mode, Execute the initialization process when returning from the power off mode,
When the control unit determines that the measured travel distance does not correspond to either the first travel distance or the second travel distance, the image reading unit executes an initialization process when returning from the power-off mode. apparatus. An image reading apparatus according to claim 1 ;
An image forming apparatus comprising: an image forming unit that forms an image read by the reading unit on a recording sheet.

Images