JP2022104141A - Image forming apparatus - Google Patents

Abstract

To change a processing mode related to preliminary scanning based on information on a document size to reduce the time required until the completion of document reading.SOLUTION: When recording sheets S in a paper feed tray 130 include the A4 size, a CPU 100 executes document size detection processing of performing preliminary scanning for document size detection with an image sensor 8, and first reading processing of performing main scanning for acquiring the details of a document P with the image sensor 8 based on the detected size of the document P. When only the A3 size recording sheets S correspond to the acquired size information, the CPU executes second reading processing of performing main scanning with the image sensor 8 based on the size of the recording sheets S corresponding to the acquired size information without performing preliminary scanning with the image sensor 8, and after the first reading processing or the second reading processing, executes image forming processing of forming an image created based on the main scanning on the recording sheet S.SELECTED DRAWING: Figure 4

Description

The present invention relates to an image forming apparatus that forms an image corresponding to the contents of a scanned document on a sheet.

Conventionally, as described in Patent Document 1, for example, an image reading device that reads a document for detecting the size of the document before performing the main scan, which is the original reading of the document, is known. In this conventional technique, the size of the original in the sub-scanning direction is determined using the image data of a plurality of lines acquired by scanning for detecting the original size, and the original size is determined.

Japanese Unexamined Patent Publication No. 2008-306366

In the image reader described in Patent Document 1, since the preliminary scan in the sub-scanning direction is uniformly performed in order to detect the size of the document, the preliminary scan may take a long processing time. No particular consideration has been given to reducing the time required to complete the reading of the original by changing the processing mode for the preliminary scan based on other information that is a clue about the size of the original.

An object of the present invention is to provide an image forming apparatus capable of shortening the time required to complete reading a document by changing the processing mode related to the preliminary scan based on the information related to the document size.

In order to achieve the above object, the present invention has a storage unit for accommodating a sheet, an image forming unit, a document table on which a document is placed, and a reading sensor that scans the document placed on the document table. An image forming apparatus including a control unit, wherein the platen is a first-size document on which either a long side or a short side can be placed according to a reference position of the platen, and a short side. A second size document whose side can be placed according to the reference position and whose long side cannot be placed according to the reference position can be placed, and the control unit is housed in the storage unit. When the size information acquisition process for acquiring the size information of the sheet is executed and the size of the sheet corresponding to the size information acquired in the size information acquisition process includes the first size, the control unit Is a book for acquiring the contents of a document by the scanning sensor based on the document size detection process in which the scanning sensor performs a preliminary scan for detecting the document size and the size of the document detected by the document size detection process. When the first reading process for scanning is further executed and the size of the sheet corresponding to the size information acquired in the size information acquisition process is only the second size, the control unit: The second reading process of performing the main scan by the reading sensor is further executed based on the size of the sheet corresponding to the size information acquired by the size information acquisition process without performing the preliminary scan by the reading sensor. Then, after the first reading process or the second reading process, the control unit executes an image forming process of forming an image generated based on the main scan on the sheet by the image forming unit. do.

The image forming apparatus of the present invention includes an accommodating unit, a reading sensor, a platen, and a control unit. A first size original and a second size original can be selectively placed on the platen. The first size is a size that allows either the long side or the short side of the original to be placed in accordance with the reference position of the platen. The second size is a size in which the short side of the document can be placed so as to be aligned with the reference position of the platen, but the long side of the document cannot be placed so as to be aligned with the reference position of the platen.
When the size information acquisition process is executed by the control unit, the size information of the sheets accommodated in the accommodation unit is acquired. The content of the subsequent processing changes depending on the content of the size corresponding to the acquired size information.

When the size of the sheet corresponding to the size information includes the first size, the original size detection process and the first reading process are performed. In the document size detection process, the scanning sensor performs a preliminary scan for detecting the document size. In the first scanning process, the scanning sensor performs the main scanning for acquiring the content of the document based on the size of the document detected by the document size detection process.
When the size of the sheet corresponding to the size information is only the second size, the second scanning process is performed without performing the document size detection process. In the second scanning process, the scanning sensor performs the main scan for acquiring the original content based on the size of the sheet corresponding to the size information acquired by the size information acquisition process. That is, in this case, by estimating the size of the document placed on the platen from the acquired size information, the preliminary scan of the document size detection process is omitted.
According to the present invention, the processing mode for the subsequent preliminary scan changes based on the acquired size information, and when the size of the sheet corresponding to the size information is only the second size, the preliminary scan is not performed. As a result, it is possible to shorten the time required to complete the scanning of the original.

According to the present invention, it is possible to shorten the time required to complete reading a document by changing the processing mode related to the preliminary scan based on the information related to the document size.

It is a schematic diagram which shows the whole structure of the image forming apparatus by one Embodiment of this invention. It is a side sectional view showing an internal structure of a document scanning unit, and a plan view seen from the arrow Ib in FIG. 2A with the rotating cover open. It is a functional block diagram which shows the control system of an image forming apparatus. It is a figure which shows the arrangement relation of a document for each size when a document is placed on a glass plate. It is explanatory drawing which shows the movement behavior of an image sensor when only the size information which shows A4 size is acquired. It is explanatory drawing which shows the moving behavior of an image sensor in the case which it is regarded as the document of A4 size horizontal placement by the preliminary scan. It is explanatory drawing which shows the moving behavior of an image sensor in the case which it is regarded as the document of A4 size vertical placement by the preliminary scan. It is explanatory drawing which shows the moving behavior of an image sensor in the case which it is regarded as the document of A3 size horizontal placement by the preliminary scan. It is explanatory drawing which shows the movement behavior of an image sensor when both the size information which shows A4 size and the size information which shows A3 size are acquired. It is explanatory drawing which shows the moving behavior of an image sensor in the case which it is regarded as the document of A4 size horizontal placement by the preliminary scan. It is explanatory drawing which shows the moving behavior of an image sensor in the case which it is regarded as the document of A4 size vertical placement by the preliminary scan. It is explanatory drawing which shows the moving behavior of an image sensor in the case which it is regarded as the document of A3 size horizontal placement by the preliminary scan. It is a figure explaining the sort process of the line scan data. It is a flowchart which shows an example of the control procedure which a CPU 100 executes. It is a flowchart which shows an example of the control procedure which a CPU 100 executes. It is a flowchart which shows an example of the control procedure which a CPU 100 executes.

<Overall configuration of image forming device>
FIG. 1 shows the overall configuration of the image forming apparatus 101 according to the embodiment of the present invention. In FIG. 1, the image forming apparatus 101 includes an apparatus main body 102. The apparatus main body 102 includes a supply unit 103, a transport unit 104, an image forming unit 105, an ejection unit 108, and a document scanning unit 110. The side with the discharge unit 108 is the front side of the image forming apparatus 101, and the side with the transport unit 104 is the rear side of the image forming apparatus 101. Further, the side with the supply unit 103 is the lower side of the image forming apparatus 101, and the side with the document scanning unit 110 is the upper side of the image forming apparatus 101.

<Supply unit>
The supply unit 103 includes a plurality of paper feed trays 130 that are detachably mounted on the lower portion of the apparatus main body 102. The recording paper S, which is the target of image formation, can be accommodated in the paper feed tray 130. The paper feed tray 130 is an example of the accommodating unit, and the recording paper S is an example of a sheet. In the present embodiment, A4 size paper or A3 size paper can be used as the recording paper S. The A4 size is an example of the first size, and the A3 size is an example of the second size. As the paper feed tray 130, a plurality of types including a type corresponding to A4 size and a type corresponding to A3 size are used. Each type of paper feed tray 130 can be attached to and detached from the lower part of the apparatus main body 102. In the present embodiment, a tray sensor SE (see FIG. 3 to be described later) that can detect which size of the paper feed tray 130 is mounted is provided at the mounting position of the paper feed tray 130 at the lower part of the apparatus main body 102. ing. The tray sensor SE indirectly detects which size of recording paper S is accommodated by detecting which type of paper feed tray 130 is mounted. The tray sensor SE outputs a detection signal corresponding to the detection result. The tray sensor SE is an example of the detection unit.

At the lower part of the apparatus main body 102, a paper feed roller 132 is provided corresponding to each paper feed tray 130. The paper feed roller 132 is provided so as to come into contact with the upper surface of the recording paper S on the rear side in the paper feed tray 130. On the rear side of the image forming apparatus 101, a conveying path L is formed from the paper feed roller 132 to the discharging unit 108 via the conveying unit 104 and the image forming unit 105. When the recording paper S is held in the paper feed tray 130, the paper feed roller 132 takes out the recording paper S in the paper feed tray 130 one by one, and forms the transport unit 104 and the image along the transport path L. Transport toward unit 105.

<Transport unit>
The transport unit 104 holds the recording paper S supplied from the supply unit 103 and transports it to the image forming unit 105. The transport unit 104 includes a transport roller 133a driven by a motor (not shown) and a resist roller 134. The transport roller 133a is a roller that applies a transport force to the recording paper S. The recording paper S conveyed from the paper feed roller 132 toward the transfer roller 133a is sandwiched between the transfer roller 133a and the paper dust removing roller 133b, and is conveyed toward the resist roller 134 along the transfer path L. The resist roller 134 corrects the posture of the recording paper S and then conveys it to the image forming unit 105.

<Image formation unit>
The image forming unit 105 forms and prints an image on the recording paper S conveyed from the conveying unit 104 by a well-known electrophotographic method, an inkjet method, a thermal transfer method, or the like. The recording paper S conveyed from the image forming unit 105 toward the transfer roller 137 is sandwiched by the transfer roller 137 and conveyed toward the discharge roller 181 along the transfer path L. The image forming unit 105 is an example of an image forming unit.

<Discharge unit>
The ejection unit 108 ejects the recording paper S on which an image is formed and ejected from the image forming unit 105 to the outside of the image forming apparatus 101. The discharge unit 108 includes a discharge roller 181, a discharge roller 182, a discharge port 183, and a discharge tray 184. The discharge roller 181 is rotationally driven by the power from the above-mentioned motor, and conveys the recording paper S discharged from the image forming unit 105 toward the discharge tray 184.

<Original scan unit>
The document scanning unit 110 includes a flat bed 111 provided above the apparatus main body 102, and a rotating cover 4 rotatably provided above the flat bed 111.

The detailed configuration of the document scanning unit 110 will be described with reference to FIG. As shown in FIG. 2, the flatbed 111 includes a hinge 3, the rotation cover 4, an open / close detection switch 5, a glass plate 7, an image sensor 8, and a guide rail 9. ..
The flat bed 111 is, for example, a hollow box-shaped structure. A rectangular glass plate 7 is provided on the upper surface of the flat bed 111 so as to be widely and horizontally attached. The glass plate 7 of the flatbed 111 is an example of a platen.

An image sensor 8 that can move in the front-rear direction along the guide rail 9 is provided under the glass plate 7. The image sensor 8 is an example of a reading sensor. The image sensor 8 moves over the entire front-rear direction of the glass plate 7, for example, by transmitting a driving force of a motor (not shown) via a feed screw. The image sensor 8 can optically read the lower surface of the document P placed on the upper surface of the glass plate 7. Hereinafter, as appropriate, the optical reading of the document P by the image sensor 8 is simply referred to as "scanning" or "scanning the document", and the optical reading of the document P by the image sensor 8 is simply "scanning". Or, it is called "manuscript scan" or the like.

The rotating cover 4 is rotatably provided via a hinge 3 arranged on the front side of the upper surface of the flatbed 111. The rotation cover 4 rotates about the hinge 3 to open and close the document scan unit 110. The user places the document P on the glass plate 7 with the rotating cover 4 open, and the image sensor 8 scans the lower surface of the document P with the rotating cover 4 closed.

The open / close detection switch 5 is provided on the upper surface of the flatbed 111, detects the open / closed state of the rotating cover 4, and outputs a corresponding signal to the CPU 100. Further, a white tape 6 extending in the left-right direction in the drawing is attached to the inner surface side of the upper wall of the flat bed 111 and in front of the glass plate 7. The image sensor 8 can be moved forward to the position below the white tape 6.

<Control system>
The operation of each part of the image forming apparatus 101 including the rotation and stopping of the motor described above is controlled by an ASIC (application specific integrated circuit) 20 which is an integrated circuit for a specific application. The control system of the image forming apparatus 101 including the ASIC 20 will be described with reference to FIG.

As shown in FIG. 3, the ASIC 20 includes a CPU 100. The CPU 100 is an example of a control unit. The ASIC 20 includes a ROM 115, a RAM 120, a touch panel 190, an image forming unit 105, a rotation drive circuit 150, a network control unit 170, an image sensor 8, a tray sensor SE, and an open / close detection switch S5, respectively. It is connected.

The ROM 115 stores various control programs necessary for the image forming apparatus 101 to operate, including a control program for executing the flowcharts shown in FIGS. 14 to 16 described later.
The RAM 120 is provided with an image data storage area 120a. In the image data storage area 120a, scanned image data as a result of scanning the document P by the image sensor 8, printed image data generated by the CPU 100, and the like are stored.

The CPU 100 controls each part according to the program read from the ROM 115, and executes the flowcharts shown in FIGS. 14 to 16 and the like, which will be described later. The CPU 100 outputs a print instruction signal to the image forming unit 105 via the ASIC 20 to instruct the image forming unit 105 to form an image on the recording paper S. The CPU 100 controls the rotation of the motor by outputting a drive control signal to the rotation drive circuit 150 that controls the rotation of the motor via the ASIC 20. By controlling the network control unit 170 via the ASIC 20, the CPU 100 transmits / receives information to / from the external terminal 300 via wireless or wired network communication. The CPU 100 acquires size information of the recording paper S in all the paper feed trays 130 mounted in the apparatus main body 102 based on the detection signal input from the tray sensor SE via the ASIC 20.

The image sensor 8 is a reflection type sensor in this example. The image sensor 8 has a light emitting unit 211a that emits emitted light La, and a light receiving unit 211b that can receive the reflected light Lb of the emitted light La emitted from the light emitting unit 211a.

The touch panel 190 can perform an appropriate display and perform a desired operation by the user. The touch panel 190 is an example of an operation unit.

<Original size>
The positional relationship of the document P with respect to the glass plate 7 when the documents P of various sizes are set on the glass plate 7 during the above-mentioned scanning will be described with reference to FIG. As shown in the figure, in this example, the rectangular glass plate 7 is arranged so that the long side is in the front-rear direction and the short side is in the left-right direction. The dimensions of the glass plate 7 in the front-rear direction and the left-right direction are slightly larger than the A3 size.

When the user manually places the document P on the glass plate 7, one of the corner points of the document P is aligned with the mounting reference point T, which is the front right corner point of the glass plate 7. The original P is placed in a so-called front-justified and right-justified arrangement in which each side of the original P is parallel to the front-back direction or the left-right direction. The line segment TT'connecting the mounting reference point T and the point T'on the front left side of the glass plate 7 is hereinafter appropriately referred to as a "reference position".

The A3 size document P has a long side of 420 mm and a short side of 297 mm. The A3 size document P can be placed on the glass plate 7 in a posture in which the longitudinal direction is the front-back direction, that is, a posture in which the short side is aligned with the reference position. Hereinafter, this posture is appropriately referred to as "horizontal placement" of the A3 size document P. In other words, the A3 size document P cannot be placed on the glass plate 7 in a posture in which the long side of the document P is aligned with the reference position. In the present specification, this "implaceable" means that when the document P is placed on the glass plate 7 in a posture in which the long side of the A3 size document P is aligned with the reference position, the entire document P cannot be scanned and the document P cannot be placed. It means that only a part of the original can be scanned, and it does not mean that the original P cannot be physically placed.

The A4 size document P has a long side of 297 mm and a short side of 210 mm. The A4 size document P can be placed on the glass plate 7 in a posture in which the longitudinal direction is the front-back direction, that is, a posture in which the short side is aligned with the reference position. Hereinafter, this posture is appropriately referred to as "horizontal placement" of the A4 size document P. The A4 size document P can be placed on the glass plate 7 even in a posture in which the longitudinal direction is the left-right direction, that is, a posture in which the long side is aligned with the reference position. Hereinafter, this posture is appropriately referred to as "vertical placement" of the A4 size document P.

This embodiment is an embodiment in which an A4 size original P or an A3 size original P is placed on a glass plate 7 as a processing target. The details of the processing will be described later. In FIG. 4, an A5 size manuscript P having a long side of 210 mm and a short side of 148.5 mm and a Letter size manuscript P having a long side of 279.4 mm and a short side of 215.9 mm are also “vertically placed” in the same manner as described above. The "horizontal" posture is also shown.

<Image sensor>
The image sensor 8 is a line image reading sensor extending over the entire left-right direction of the glass plate 7, and a large number of sensor elements are arranged in a row in the left-right direction of the glass plate 7. In FIG. 4, the image sensor 8 is omitted in order to avoid the complexity of the illustration. The image sensor 8 can optically scan the entire lower surface of the document P by moving below the glass plate 7 from one side to the other in the front-rear direction. The main scanning direction is the direction of one line that the image sensor 8 can scan all at once, that is, the left-right direction. Further, the front-back direction in which the image sensor 8 moves is the sub-scanning direction. The main scanning direction is an example of the first direction, and the sub-scanning direction is an example of the second direction.

Each sensor element of the image sensor 8 has a high sensitivity that can be recognized by distinguishing the surface region of the document P and the lower surface region of the rotating cover 4 via the glass plate 7.
The image sensor 8 can detect the presence or absence of a boundary between the surface region of the document P and the lower surface region of the rotating cover 4 based on the difference in light receiving intensity between the sensor elements at an arbitrary position in the sub-scanning direction. .. Based on the detection result of the image sensor 8, the CPU 100 can detect the presence / absence of an edge of the document P in the main scanning direction and the position of the edge, if any. The edge in the main scanning direction is an edge extending in the sub-scanning direction in which a step before and after the edge occurs in the main scanning direction. Hereinafter, the detection of the presence / absence of an edge or the edge position of the CPU 100 based on the detection result of the image sensor 8 is described as simply “detecting the presence / absence of an edge or the edge position by the image sensor 8”. When the image sensor 8 is moving in the sub-scanning direction, there is a boundary between the surface region of the document P and the lower surface region of the rotation cover 4 based on the change in the light receiving intensity in the entire line, and if there is a boundary. The position of the boundary can be detected. In other words, the image sensor 8 can detect the presence / absence of an edge of the document P in the sub-scanning direction and the position of the edge if there is an edge. The edge in the sub-scanning direction is an edge extending in the main scanning direction in which a step before and after the edge occurs in the sub-scanning direction.
In this embodiment, various processes at the time of detection are different between the edge detection by the image sensor 8 and the document scan. Edge detection can be performed with a relatively simpler process than document scanning.

Among a large number of sensor elements provided in the image sensor 8, there may be a difference in individual light receiving intensity due to deterioration over time or the like. Correspondingly, in the present embodiment, before each scanning operation, the image sensor 8 performs a scanning operation at a position below the white tape 6 having uniform light reflection, and at that time, individual sensor elements are executed. Shading correction is performed between the light receiving intensity data detected in. Based on the detection result of the open / close detection switch 5, the CPU 100 attaches the image sensor 8 to the white tape 6 via the rotation drive circuit 150 when it is estimated that the closed rotation cover 4 is opened and the document P is placed. Move to the initial position HP below, and perform shading correction.
In the present embodiment, for example, when the image sensor 8 moves in the sub-scanning direction, the moving speed that goes straight to a specific position such as the initial position HP without scanning is the fastest, and the edge detection is performed. The moving speed becomes slower in the order of the moving speed of the original P and the moving speed while scanning the document P.

<Characteristics of the embodiment>
The time required for the entire scanning process in the document scanning unit 110 largely depends on the scanning moving distance of the image sensor 8 in the sub-scanning direction, that is, the size of the length dimension of the document P in the sub-scanning direction. Therefore, in order to shorten the time required for the entire scanning process, it is preferable to specify in advance the reading target area of the image sensor 8, that is, the paper size of the document P and its placement posture. Therefore, usually, after the original P is placed on the glass plate 7 and before the main scan is executed, a preliminary scan for quickly identifying the paper size of the original P and its placement posture is executed.

The feature of this embodiment is that the CPU 100 changes the processing mode related to the preliminary scan according to the size information of the recording paper S acquired based on the detection signal of the tray sensor SE as described above. The details will be described below in order.

<Preparation process>
First, when the rotating cover 4 is in the closed state and the open state of the rotating cover 4 is detected, the image sensor 8 is moved to the initial position HP to perform shading correction. After that, the following processing is executed according to the size of the recording paper S accommodated in the paper feed tray 130.

<When only size information indicating A4 size>
That is, all of the paper feed trays 130 mounted in the apparatus main body 102 are trays containing A4 size recording paper S. In this case, the size of the document P to be read, which is placed on the glass plate 7, is also estimated to be A4 size. Therefore, in the present embodiment, the following processing is executed under the control of the CPU 100 in order to detect which of the above-mentioned "A4 size vertical placement" and "A4 size horizontal placement" the document P corresponds to.

That is, first, as shown in FIG. 5A, the image sensor 8 moves from the above-mentioned initial position HP to the position S2 slightly behind the front end of the glass plate 7. Position S2 is an example of the first position. The movement from the initial position HP to the position S2 at this time is a movement in which the reading operation is not performed. Hereinafter, such movement is appropriately referred to as "direct movement".

After that, as shown in FIG. 5 (b), the image sensor 8 reads the document P while moving from the position S2 to the position S2'which is slightly in front of the position S2. The CPU 100 performs edge detection in the main scanning direction in the region between the position S2 and the position S2'based on the reading result of the image sensor 8. Edge detection in the main scanning direction means detecting the right end and the left end of the document P. Hereinafter, such movement of the image sensor 8 is appropriately referred to as “edge detection movement”. This edge detection corresponds to an example of a preliminary scan when A4 size size information is acquired.

As a result of detecting the edge in the main scanning direction, if the lengths of the two detected edges are substantially the same as the short side of the A4 size document P, as shown in FIG. 6A, with respect to the glass plate 7. It can be considered that the A4 size document P is placed horizontally. Therefore, the image sensor 8 moves orthogonally from the above-mentioned position S2'to the position S1. The position S1 is a position slightly in front of the above-mentioned reference position and outside the glass plate 7. The position S1 and the above-mentioned position S2 are separated from each other by, for example, about 10 mm.

After that, as shown in FIG. 6B, the image sensor 8 scans the document P while moving from the position S1 to the position S3 ″. The position S ″ is the A4 size document P placed horizontally. It is a position corresponding to the rear side slightly from the rear end. Hereinafter, such movement of the image sensor 8 is appropriately referred to as “scan movement”. As a result, the image sensor 8 reads the contents of the A4 size document P placed horizontally on the glass plate 7, and the CPU 100 generates image data corresponding to the reading result.

As a result of detecting the edge in the main scanning direction, if the lengths of the two detected edges are substantially the same as the long side of the A4 size document P, as shown in FIG. 7A, with respect to the glass plate 7. It can be considered that the A4 size document P is placed vertically. Therefore, the image sensor 8 moves orthogonally from the position S2'to the position S1 as described above.

After that, as shown in FIG. 7B, the image sensor 8 scans and moves from the position S1 to the position S3'. The position S3'is a position slightly behind the rear end of the vertically placed A4 size document P. As a result, the image sensor 8 reads the contents of the A4 size document P placed vertically on the glass plate 7, and the CPU 100 generates image data corresponding to the reading result. The reading of the document P at this time corresponds to an example of the main scan.

<When only size information indicating A3 size>
That is, all of the paper feed trays 130 mounted in the apparatus main body 102 are trays containing the A3 size recording paper S. In this case, the size of the document P to be read, which is placed on the glass plate 7, is also estimated to be A3 size. Therefore, in the present embodiment, it is considered that the document P corresponds to the above-mentioned "A3 size horizontal placement", and the following processing is executed under the control of the CPU 100.

That is, first, as shown in FIG. 8A, the image sensor 8 moves from the above-mentioned initial position HP to the above-mentioned position S1. The movement from the initial position HP to the position S1 at this time is a direct movement without performing a reading operation.

After that, as shown in FIG. 8B, the image sensor 8 scans and moves from the position S1 to the position S4. The position S4 is a position slightly behind the rear end of the horizontally placed A3 size document P. That is, when the size information of A3 size is acquired, the preliminary scan is not executed unlike the case where the size information of A4 size is acquired. By the scan movement, the image sensor 8 reads the contents of the A3 size document P placed vertically on the glass plate 7, and the CPU 100 generates image data corresponding to the reading result. The reading of the document P at this time also corresponds to an example of this scan.

<When there is both size information indicating A3 size and size information indicating A4 size>
That is, when the paper feed tray 130 mounted in the apparatus main body 102 includes both a tray containing A4 size recording paper S and a tray containing A3 size recording paper S. be. In this case, the size of the original P to be read placed on the glass plate 7 is estimated to be either A4 size or A3 size. Therefore, in the present embodiment, in order to detect which of "A4 size vertical placement", "A4 size horizontal placement", and "A3 size horizontal placement" the document P corresponds to, the following processing is executed under the control of the CPU 100. Will be done.

That is, first, as shown in FIG. 9A, the image sensor 8 moves orthogonally from the above-mentioned initial position HP to the position S3 at the substantially central portion in the front-rear direction of the glass plate 7. The position S3 is a position slightly in front of the rear end of the vertically placed A4 size document P. The position S3 is located slightly in front of the above-mentioned position S3'. The position S3 is farther from the initial position HP than the position S2. Position S3 is an example of the second position.

After that, as shown in FIG. 9B, the image sensor 8 performs edge detection movement from the position S3 to the position S3'slightly behind the position S3, and between the position S3 and the position S3'. Edge detection in the main scanning direction and the sub-scanning direction is performed in the region of. This edge detection corresponds to an example of a preliminary scan when both A4 size size information and A3 size size information are acquired.

When an edge is detected only in the main scanning direction and the lengths of the two edges detected in the main scanning direction are substantially the same as the short side of the A4 size document P, as shown in FIG. 10 (a). It can be considered that the A4 size original P is placed horizontally with respect to the glass plate 7. Therefore, the image sensor 8 performs edge detection movement from the position S3'toward the rear side, and detects the edge of the rear end portion of the horizontally placed A4 size document P.

When the rear end portion of the horizontally placed A4 size document P is detected, the image sensor 8 scans and moves from the position where the edge of the rear end portion is detected to the position S1 as shown in FIG. 10 (b). At the same time, the document P is scanned. The image sensor 8 reads the contents of the A4 size document P placed horizontally on the glass plate 7, and the CPU 100 generates image data corresponding to the reading result. The reading of the document P at this time also corresponds to an example of this scan.

As described above, the position S3'is a position slightly behind the rear end of the vertically placed A4 size document P. The position S3 is a position slightly in front of the rear end of the vertically placed A4 size document P. Therefore, when the edge in the main scanning direction is detected and the edge in the sub-scanning direction is detected, the A4 size document P is placed vertically on the glass plate 7 as shown in FIG. 11A. Can be considered to be. Therefore, the image sensor 8 performs edge detection movement from the position S3'toward the front side, and detects the edge of the rear end portion of the vertically placed A4 size document P.

When the rear end portion of the vertically placed A4 size document P is detected, the image sensor 8 scans and moves from the position where the edge of the rear end portion is detected to the position S1 as shown in FIG. 11B. At the same time, the document P is scanned. The image sensor 8 reads the contents of the A4 size document P placed vertically on the glass plate 7, and the CPU 100 generates image data corresponding to the reading result. The reading of the document P at this time also corresponds to an example of this scan.

When an edge is detected only in the main scanning direction and the lengths of the two edges detected in the main scanning direction are substantially the same as the short side of the A3 size document P, as shown in FIG. 12 (a). It can be considered that the A3 size original P is placed horizontally with respect to the glass plate 7. Therefore, the image sensor 8 performs edge detection movement from the position S3'toward the rear side, and detects the edge of the rear end portion of the horizontally placed A3 size document P.

When the rear end portion of the horizontally placed A3 size document P is detected, the image sensor 8 scans and moves from the position where the edge of the rear end portion is detected to the position S1 as shown in FIG. 12 (b). At the same time, the document P is scanned. The image sensor 8 reads the contents of the A3 size document P placed horizontally on the glass plate 7, and the CPU 100 generates image data corresponding to the reading result. The reading of the document P at this time also corresponds to an example of this scan.

<Reverse alignment processing of line scan data>
In any of the cases executed in FIGS. 10 (b), 11 (b), and 12 (b) above, the image sensor 8 is in the direction from the rear end position to the front end position with respect to the reading target area. Since the scan is moved in, the following inconveniences occur. That is, in the normal scan movement as performed in FIGS. 6 (b), 7 (b), and 8 (b), for example, as shown in FIG. 13 (a), the image sensor 8 moves in the main scanning direction. The 1-line scan in is repeated while moving from the front side to the rear side. Then, by storing the acquired line scan data side by side in the image data storage area 120a in the line data alignment direction corresponding to the acquisition order, the contents of the document P are matched with the contents of the original P in both the vertical direction and the horizontal direction. Can be stored as image data of.

On the other hand, as shown in FIG. 13B, when the image sensor 8 scans and moves from the rear side to the front side in the opposite direction to the above, the line scan data is acquired in the acquisition order without changing the line data alignment direction. Assuming that the data is stored in the image data storage area 120a as it is, the content of the original P is stored as image data in which the vertical direction is reversed.

Therefore, in the present embodiment, as shown in FIG. 13C, each line scan data acquired by the scan movement from the rear side to the front side is temporarily recorded in a separate buffer area in the acquisition order, and then acquired. The reverse alignment process of rearranging each line scan data in the forward and reverse order is performed and recorded in the original storage area. As a result, it is possible to store the image data in a facing posture in which the notation image of the original P is matched in the vertical direction. When acquiring each line scan data, the line data alignment direction itself may be inverted and recorded in the image data area.

<Control procedure>
As an example of the method for realizing the above method, the control procedure executed by the CPU 100 will be described with reference to the flowcharts of FIGS. 14 to 16. This flow is started in a state where the document P is not placed on the glass plate 7 and the rotation cover 4 is in the closed state.

In FIG. 14, first, in S1, size information of the recording paper S in all the paper feed trays 130 mounted in the apparatus main body 102 is acquired based on the detection signal input from the tray sensor SE. The process executed in S1 is an example of the size information acquisition process.
In S5, it is determined whether or not the rotation cover 4 is in the open state based on the detection result of the open / close detection switch 5. When the rotation cover 4 is in the closed state, a Yes determination is made and the process proceeds to S10.

In S10, it is determined whether or not the image sensor 8 is located at the initial position HP at that time. If the image sensor 8 is located at the initial position HP, a YES determination is made, and the process proceeds to S20 described later. If the image sensor 8 is not located at the initial position HP, a NO determination is made and the process proceeds to S15.
In S15, the image sensor 8 moves linearly to the initial position HP by the control via the rotation drive circuit 150.

In S20, a scanning operation is executed by the image sensor 8 on the white tape 6 at the initial position HP, and shading correction is performed between the light receiving intensity data detected by the individual sensor elements by an appropriate method.

After that, in S22, based on the acquisition result in S1, it is determined whether or not all the acquired size information is information representing the A4 size. If the acquired size information includes information representing a size other than the A4 size, that is, information representing the A3 size in this example, a No determination is made, and the process proceeds to S60 described later. If only the A4 size is included in the acquired size information, a Yes determination is made and the process proceeds to S25.
In S25, the image sensor 8 moves orthogonally to the position S2 under the control via the rotation drive circuit 150 (see FIG. 5A). The process executed in S25 is an example of the sensor movement process.

In S30, it is determined whether or not the rotation cover 4 is in the closed state based on the detection result of the open / close detection switch 5. When the rotation cover 4 is in the closed state, a Yes determination is made and the process proceeds to S35.
In S35, a preliminary scan is performed in which the image sensor 8 is edge-detected and moved from the position S2 to S2'(see FIG. 5B).
In S40, based on the edge detection result in S35, it is determined whether or not the length of the edge in the main scanning direction is substantially the same as the short side of the A4 size document P. The process executed in S40 is an example of the first determination process. If the edge in the main scanning direction is substantially the same as the short side of the A4 size document P, a Yes determination is made. Transition. If the length of the edge in the main scanning direction is not substantially the same as the short side of the A4 size document P, that is, if the edge length is substantially the same as the long side of the A4 size document P, No is determined, and in S50. The original P on the glass plate 7 is identified as having an A4 size vertical arrangement, and shifts to S55.

In S55, the image sensor 8 moves orthogonally to the position S1 by control via the rotation drive circuit 150 (see FIGS. 6A and 7A). After that, the process proceeds to S100 in FIG.

In S60, in which S22 is determined to be No and the transition is made, it is determined whether or not all the acquired size information is information representing the A3 size based on the acquisition result in S1. If the acquired size information contains information indicating a size other than the A3 size, that is, if both the information indicating the A4 size and the information indicating the A3 size are included in this example, a No judgment is made. The process proceeds to S75, which will be described later. If only the A3 size is included in the acquired size information, a Yes determination is made and the process proceeds to S65.

In S65, the image sensor 8 moves orthogonally to the position S1 by control via the rotation drive circuit 150 (see FIG. 8A).
In S70, it is determined whether or not the rotation cover 4 is in the closed state based on the detection result of the open / close detection switch 5. When the rotating cover 4 is in the closed state, a Yes determination is made, and in S72, the original P on the glass plate 7 is identified as having an A3 size horizontal arrangement, and the process proceeds to S100 in FIG.

In S100 of FIG. 15, at this point, it is determined whether or not the original P on the glass plate 7 is identified as the A4 size horizontal arrangement. If it is identified as A4 size horizontal arrangement in S45, it is determined as Yes, and the process proceeds to S140 described later. If it is not identified as the A4 size horizontal arrangement, a No determination is made and the process proceeds to S110.

In S110, it is determined whether or not the original P on the glass plate 7 is identified as the A4 size vertical arrangement. If it is identified as A3 size horizontal arrangement in S72, it is determined as No, and the process proceeds to S130 described later. If it is identified as the A4 size vertical arrangement, a Yes determination is made and the process proceeds to S120.

In S120, the image sensor 8 scans and moves from the position S1 to the position S3'(see FIG. 7 (b) above). The process executed in S120 is an example of the first reading process.

In S140 where S100 is determined to be Yes and the transition is made, the image sensor 8 scans and moves from position S1 to position S3 ″ (see FIG. 6B above). The process executed in S140 is also the first. This is an example of reading processing.

In S130 in which S110 is determined to be No, the image sensor 8 scans and moves from the position S1 to the position S4 (see FIG. 8B above). The process executed in S130 is an example of the second reading process.

After S120, S130, and S140, the process proceeds to S125, and the line scan data acquired so far are aligned and stored in the image data storage area 120a. Then, this flow ends.

On the other hand, in S75, which returns to FIG. 14 and S60 is determined to be No, the image sensor 8 moves orthogonally to the position S3 by the control via the rotation drive circuit 150 (see FIG. 9A). The process executed in S75 is also an example of the sensor movement process.

In S80, it is determined whether or not the rotation cover 4 is in the closed state based on the detection result of the open / close detection switch 5. When the rotation cover 4 is in the closed state, a Yes determination is made and the process proceeds to S85.
In S85, a preliminary scan is performed in which the image sensor 8 is edge-detected and moved from the position S3 to S3'(see FIG. 9B). The process executed in S85 and the above-mentioned S35 is an example of the size detection process. After that, the process proceeds to S150 in FIG.

In S150 of FIG. 16, it is determined whether or not the length of the edge in the main scanning direction is substantially the same as the short side of the A4 size document P based on the edge detection result in S85. If the length of the edge is not substantially the same as the short side of the A4 size document P, that is, if the length of the edge is substantially the same as the long side of the A4 size document P, a No determination is made and the process proceeds to S190 described later. If the length of the edge is substantially the same as the short side of the A4 size original P, a Yes determination is made, and the original P on the glass plate 7 is considered to be in the A4 size horizontal arrangement, and the process proceeds to S160.

In S160, the image sensor 8 performs edge detection movement from the position S3'to the rear side (see FIG. 10A). If the rear end edge of the document P arranged horizontally in A4 size is detected during the edge detection movement, S170 is determined as Yes, the image sensor 8 stops moving in S175, and then shifts to S180. In S180, the image sensor 8 changes its direction and scans and moves toward the front side to the position S1 (see FIG. 10B). The process executed in S180 is also an example of the first reading process.

In S190 in which S150 is determined to be No and the transition is made, it is determined whether or not the rear end edge of the document P on the glass plate 7 is detected based on the edge detection result in S85. The process executed in S190 and the above-mentioned S150 is an example of the second determination process. If the trailing edge is not detected, No is determined, and the original P on the glass plate 7 is considered to be in the A3 size horizontal arrangement, and the process proceeds to S230 described later. If the trailing edge is detected, Yes is determined, and the original P on the glass plate 7 is regarded as being arranged vertically in A4 size, and the process proceeds to S200.

In S200, the image sensor 8 changes its direction from the position S3'and performs edge detection movement toward the front side (see FIG. 11A). If the trailing edge of the document P in the A4 size vertical arrangement is detected during the edge detection movement, S210 is determined to be Yes, and the process proceeds to S220. In S220, the image sensor 8 continues to scan and move toward the front side to the position S1 (see FIG. 11B). The process executed in S220 is also an example of the first reading process.

In S230, where S190 is determined to be No, the image sensor 8 performs edge detection movement from the position S3'to the rear side (see FIG. 12A). If the rear end edge of the document P arranged horizontally in A3 size is detected during the edge detection movement, S240 is determined as Yes, and after the image sensor 8 stops moving in S255, the process proceeds to S260. The position where the image sensor 8 has stopped moving is an example of the third position. In S260, the image sensor 8 turns and scans to the position S1 toward the front side (see FIG. 12B). The process executed in S260 is also an example of the second reading process.

After S180, S220, and S260, the process proceeds to S270, and the line scan data acquired so far are reverse-aligned and stored in the image data storage area 120a. Then, this flow ends.

<Image formation processing>
After S125 or S270, an image generated based on the above-mentioned line scan data stored in the image data storage area 120a in the S125 or S270 is formed on the recording paper S by the image forming unit 105. This process is an example of an image forming process.

<Effect of embodiment>
As described above, the image forming apparatus 101 of the present embodiment includes a paper feed tray 130, an image sensor 8, a glass plate 7, and a CPU 100. An A4 size original P and an A3 size original P can be selectively placed on the glass plate 7. The A4 size is a size that allows either the long side or the short side of the original P to be placed in accordance with the reference position of the glass plate 7. The A3 size is a size in which the short side of the document P can be placed in alignment with the reference position of the glass plate 7, but the long side of the document P cannot be placed in alignment with the reference position of the glass plate 7.
When S1 is executed by the CPU 100, the size information of the recording paper S accommodated in the paper feed tray 130 is acquired. The content of the subsequent processing changes depending on the content of the size corresponding to the acquired size information.

When the size of the recording paper S corresponding to the size information includes the A4 size, S35 and S1200 or S140 are performed. In S35, the image sensor 8 performs a preliminary scan for detecting the document size. In S120 or S140, the image sensor 8 performs the main scan for acquiring the contents of the document P based on the size of the document P detected in S35.
When the size of the recording paper S corresponding to the size information is only A3 size, S130 is performed without detecting the original size. In S130, the image sensor 8 performs the main scan for acquiring the contents of the document P based on the size of the recording paper S corresponding to the size information acquired in S1. That is, in this case, by estimating the size of the document P placed on the glass plate 7 from the acquired size information, the preliminary scan for detecting the document size is omitted.
According to the present embodiment, the processing mode for the subsequent preliminary scan changes based on the acquired size information, and when the size of the recording paper S corresponding to the size information is only A3 size, the preliminary scan is not performed. As a result, the time required to complete the reading of the original P can be shortened.

Further, in the present embodiment, particularly when the size of the recording paper S corresponding to the size information is only A4 size, the end portion in the main scanning direction is detected by the preliminary scan in S35. In the subsequent S40, depending on the detection result of the end portion in the main scanning direction, whether the A4 size document P placed on the glass plate 7 is placed with the short sides aligned or the long sides aligned. Judged. This scan is performed in S120 or S140 within the range according to the determination result.
According to the present embodiment, when the size of the recording paper S corresponding to the size information is only A4 size, the time required for detecting the original size is shortened by detecting only the end portion in the main scanning direction in the preliminary scan. can do.

Further, in the present embodiment, particularly when the size of the recording paper S corresponding to the size information includes both A4 size and A3 size, the end portion in the main scanning direction and the sub-scanning direction orthogonal to the main scanning direction in the preliminary scan in S85. Is detected. In the subsequent S150 and S190, the size and the placement orientation of the document P placed on the glass plate 7 are determined according to the detection results of the ends in the main scanning direction and the sub-scanning direction. The main scan is performed in S180, S220, and S260 within the range according to the judgment result.
According to the present embodiment, even when the size of the recording paper S corresponding to the size information includes both the A4 size and the A3 size, the end portions in the main scanning direction and the sub-scanning direction are detected in the preliminary scan. This makes it possible to detect the original size and accurately identify whether it is A4 size or A3 size.

Further, in the present embodiment, in particular, in S25 or S75, the start position of the preliminary scan can be changed according to the size information acquired in S1. That is, when the size corresponding to the size information is only A4 size, the image sensor 8 is moved from the initial position HP to the position S2 in the non-reading state in S25, and then the preliminary scan is started from the position S2. When the size corresponding to the size information includes both the A4 size and the A3 size, the image sensor 8 is moved from the initial position HP to the position S3 in the non-reading state in S75. The distance from the initial position HP is farther than the position S2 at the position S3. After that, the preliminary scan is started from the position S3.
When the size corresponding to the size information is only A4 size, the preliminary scan is started from the position S2 closer to the position S3, so that the time for moving the image sensor 8 in the non-reading state before the preliminary scan can be shortened.

Further, in the present embodiment, in particular, when the document P is determined to be A4 size in S150 and S190 based on the result of the preliminary scan starting from the position S3, the main scan in S180 or S220 positions the image sensor 8. It is performed while returning to the S1 side, in other words, the initial position HP side. As a result, the time required to complete the reading can be shortened as much as possible as compared with the case where the main scan is performed after the image sensor 8 is returned to the initial position HP in the non-reading state.

Further, in the present embodiment, in particular, when the document P is determined to be A3 size in S150 and S190 based on the result of the preliminary scan started from the position S3, the image sensor 8 is used at the rear end of the A3 size document P. After proceeding to the above, the main scan is performed while returning the image sensor 8 to the initial position HP side from the rear end position. As a result, the time required to complete the reading can be shortened as much as possible as compared with the case where the main scan is performed after the image sensor 8 is returned to the initial position HP in the non-reading state.

Further, in the present embodiment, the tray sensor SE is particularly provided. The tray sensor SE detects the size of the recording paper S housed in the paper feed tray 130 and outputs a corresponding detection signal. In S1, the CPU 100 acquires size information based on the detection signal output from the tray sensor SE. As a result, the size of the recording paper S actually stored in the paper feed tray 130 can be acquired by the CPU 100, and processing corresponding to this can be performed.

<Modification example>
The present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit and technical idea. Hereinafter, such modification examples will be described step by step.

(1) Limited to when the copy function is set to "equal magnification" One of the functions that can be used in the image forming apparatus 1 having the above configuration is the copy function. In this copy function, the image of the original P obtained by the original scan unit 110 is printed on the recording paper S by the image forming unit 105 to perform copying as duplicate printing. When the user uses this copy function, generally, the paper size of the recording paper S is the same as that of the original P. That is, the enlargement / reduction ratio setting of the enlargement / reduction function is set to the same size for printing. Focusing on this point, the processing excluding S75, S80, and S85 in FIG. 14 and the processing shown in FIG. 15 may be performed only when the scaling ratio is set to the same magnification. It should be noted that all the processes shown in FIGS. 14 to 16 may be performed only when the scaling ratio is set to the same magnification.

In this modification, it has the following significance. That is, in the method in the above embodiment for estimating the size of the document P placed on the glass plate 7 from the acquired size information, the size of the document P to be read and the image formed by the image forming unit 105 are the same size. It holds only when is. That is, when an image enlarged or reduced from the size of the document P to be read is formed by the image forming unit 105, there is not necessarily a clear correlation between the size information and the size of the actual document P placed on the image. The relationship does not hold.
According to this modification, at least the document size detection in S35 and the main scan in S120 and S140 when the size of the recording paper S includes the A4 size and the size of the recording paper S are A3 corresponding to the above. The main scan in S130 in the case of only the size is performed only when the scaling factor setting is the same magnification. According to this embodiment, the size of the document P placed on the glass plate 7 can be estimated with high accuracy from the acquired size information.

(2) Acquisition of size information based on manual user operation In the above, the size information is acquired by the CPU 100 based on the detection signal from the tray sensor SE, but the present invention is not limited to this. That is, in S1 of FIG. 14, the CPU 100 may acquire the corresponding size information based on the size of the recording paper S manually input by the user via the touch panel 190.

According to this modification, even if the size of the recording paper S actually stored in the paper feed tray 130 cannot be detected, the CPU 100 acquires the size of the recording paper S by the operation input of the user, and corresponds to this. Processing can be performed.

(3) Others In the above description, when there is a description such as "vertical", "parallel", "planar", etc., the description does not have a strict meaning. That is, those "vertical", "parallel", and "planar" mean "substantially vertical", "substantially parallel", and "substantially flat" because tolerances and errors in design and manufacturing are allowed. ..

Further, in the above description, when there is a description such as "same", "equal", "different", etc. in the external dimensions and sizes, the description is not a strict meaning. That is, those "same", "equal", and "different" mean that "substantially the same", "substantially equal", and "substantially different" are allowed due to design and manufacturing tolerances and errors. ..

Further, the flowcharts shown in FIGS. 14, 15, 16 and the like do not limit the present invention to the procedure shown in the above flow, and add / delete or order the procedures within a range that does not deviate from the purpose and technical idea of the invention. May be changed.

In addition to the above-mentioned above, the methods according to the above-described embodiment and each modification may be appropriately combined and used.

In addition, although not illustrated one by one, the present invention is carried out with various modifications within a range not deviating from the gist thereof.

7 Glass plate (an example of a manuscript stand)
8 Image sensor (example of reading sensor)
100 CPU (an example of control unit)
101 Image forming device 105 Image forming unit (an example of an image forming unit)
130 Paper tray (example of storage unit)
190 Touch panel (example of operation unit)
P Manuscript S Recording paper (an example of a sheet)
S2 position (an example of the first position)
S3 position (an example of the second position)
SE tray sensor (example of detector)

Claims (9)

A storage unit for accommodating seats and
Image forming part and
The manuscript stand on which the manuscript is placed and
A reading sensor that scans the document placed on the document table, and
Control unit and
It is an image forming apparatus equipped with
The manuscript stand
A first-size document in which either the long side or the short side can be placed according to the reference position of the platen, and the short side can be placed in accordance with the reference position and the long side can be placed in the reference position. It is possible to place a second size manuscript that cannot be placed together.
The control unit
The size information acquisition process for acquiring the size information of the sheet accommodated in the accommodating portion is executed, and the size information acquisition process is executed.
When the size of the sheet corresponding to the size information acquired in the size information acquisition process includes the first size, the control unit:
Document size detection processing that performs preliminary scanning for document size detection by the reading sensor, and
Based on the size of the document detected by the document size detection process, the first scanning process of performing the main scan for acquiring the document contents by the scanning sensor and the first scanning process.
Further run,
When the size of the sheet corresponding to the size information acquired in the size information acquisition process is only the second size, the control unit may use the control unit.
The second reading process of performing the main scan by the reading sensor is further executed based on the size of the sheet corresponding to the size information acquired by the size information acquisition process without performing the preliminary scan by the reading sensor. death,
After the first reading process or the second reading process, the control unit
An image forming apparatus, characterized in that an image forming process of forming an image generated based on the present scan on the sheet by the image forming unit is executed. The control unit
When the size of the sheet corresponding to the size information acquired in the size information acquisition process is only the first size, the edge of the first direction is detected by the preliminary scan in the document size detection process. death,
And,
It is determined whether the first size document placed on the platen is placed with the short side aligned with the reference position or the long side aligned with the reference position. 1 Execute the judgment process and
And,
The image forming apparatus according to claim 1, wherein in the first reading process, the main scan is performed within a range corresponding to the determination result in the first determination process. A plurality of the accommodating portions are provided.
The control unit further
When the size of the sheet corresponding to the size information acquired in the size information acquisition process includes both the first size and the second size, in the document size detection process, the preliminary scan is performed in the first direction. And the end in the second direction orthogonal to the first direction are detected.
And,
The image forming apparatus according to claim 2, wherein a second determination process for determining the size and orientation of the document placed on the platen is executed. The control unit further
When the size of the sheet corresponding to the size information acquired in the size information acquisition process is only the first size, the reading sensor is moved from the initial position HP to the first position in a state where the reading operation is not performed. When the size of the sheet corresponding to the size information acquired in the size information acquisition process includes both the first size and the second size, the initial position is in a state where the reading sensor is not operated. A sensor movement process is executed to move the sensor to the second position, which is the second position from the HP and the distance from the initial position HP is farther than the first position.
In the first reading process,
The image forming apparatus according to claim 3, wherein the reading sensor starts the preliminary scan from the first position or the second position moved by the sensor movement process. The control unit
When the document is determined to be the first size in the second determination process based on the result of the preliminary scan started from the second position, the reading sensor is placed in the initial position in the first reading process. The image forming apparatus according to claim 4, wherein the main scan is performed while moving to the HP. The control unit
When the document is determined to be the second size in the second determination process based on the result of the preliminary scan started from the second position, the reading sensor is placed in the initial position in the second reading process. The image forming apparatus according to claim 4 or 5, wherein the scan is performed while moving to a third position in a direction away from the HP and moving from the third position to the initial position HP. Acquired by the original size detection process, the first reading process, and the size information acquisition process when the size of the sheet corresponding to the size information acquired in the size information acquisition process includes the first size. In the case where the size of the sheet corresponding to the size information is only the second size, the scaling ratio of the image formed by the image forming unit with respect to the reading result of the main scan can be set for the second reading process. The image forming apparatus according to any one of claims 1 to 6, wherein the image forming apparatus is performed only in the case of doubling. Further having a detection unit that detects the size of the sheet housed in the storage unit and outputs a corresponding detection signal.
The control unit is in the size information acquisition process.
The image forming apparatus according to any one of claims 1 to 7, wherein the size information based on the detection signal is acquired from the detection unit. It also has an operation unit
The control unit is in the size information acquisition process.
The image forming apparatus according to any one of claims 1 to 7, wherein the size information based on the size of the sheet input via the operation unit is acquired.

Images