Image reading system and image forming system

Abstract

To suppress variation in the quality of an image after correction using white reference data as compared to a configuration in which a reference marker is provided on only one end side of the axial direction of a rotating member on a white reference surface.SOLUTION: An image reading system includes a reading unit that is provided on a transport path along which a document is transported and that reads an image from the document transported on the transport path, a rotating member that is arranged opposite the reading unit across the transport path and rotates with the main scanning direction of the reading unit as its axial direction, a flat white reference surface that is provided on the outer periphery of the rotating member and from which white reference data is read by the reading unit, reference markers that are provided on both ends of the white reference surface in the axial direction and read by the reading unit, and a processor that, when the rotational positions of the rotating member in a case in which each of the reference markers is read is different, sets a reading reference position for the white reference data between the rotational positions of the rotating member that have been read, and controls the reading unit to perform reading at a position based on the reading reference position.SELECTED DRAWING: Figure 12

Description

[Technical field]

[0001] The present disclosure relates to an image reading system and an image forming system. [Background technology]

[0002] Patent document 1 discloses an image reading device having a line sensor having a plurality of photoelectric conversion elements arranged in a one-dimensional manner, a white reference image reading means for reading a white reference image of a white reference portion using the line sensor, a storage means for storing white reference data based on the output of each photoelectric conversion element, and a shading correction means for correcting the output of each photoelectric conversion element based on the correction data when reading an image of a document, further comprising a detection means for detecting a reading position mark indicating the start position of the white reference portion, and a reference data reading means for reading white reference data based on the detected mark position. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2004-112101 A Summary of the Invention [Problem to be solved by the invention]

[0004] The present disclosure aims to reduce variation in quality of an image after correction using white reference data, compared to a configuration in which a reference marker is provided on only one axial end side of a rotating member on a white reference surface. [Means for solving the problem]

[0005] The image reading system of a first aspect of the present disclosure comprises a reading unit provided on a transport path for transporting a document and reading an image from the document transported on the transport path, a rotating member arranged opposite the reading unit across the transport path and rotating with the main scanning direction of the reading unit as its axial direction, a flat white reference surface provided on the outer periphery of the rotating member and from which white reference data is read by the reading unit, reference markers provided on both ends of the white reference surface in the axial direction and read by the reading unit, and a processor that, when the rotational positions of the rotating member when each of the reference markers is read is different, sets a reading reference position for the white reference data between the rotational positions of the rotating member that have been read, and controls the reading unit to perform reading at a position based on the reading reference position.

[0006] An image reading system according to a second aspect of the present disclosure is the image reading system according to the first aspect, wherein the processor sets a central position between rotational positions of the rotating member at which each of the reference markers is read as the reading reference position.

[0007] An image reading system according to a third aspect of the present disclosure is the image reading system according to the first aspect, wherein the reference marker is provided at the center of the white reference surface in a width direction perpendicular to the axial direction.

[0008] An image reading system according to a fourth aspect of the present disclosure is the image reading system according to the first aspect, wherein the reference marker is a linear marker extending along the axial direction of the rotating member.

[0009] An image reading system of a fifth aspect of the present disclosure is the image reading system of the first aspect, in which another marker is provided on at least one end side of the axial direction of the white reference surface, at a position away from the reference marker in the rotational direction of the rotating member, and when the processor reads the other marker, it controls the rotational speed of the rotating member.

[0010] An image reading system of a sixth aspect of the present disclosure is the image reading system of the fifth aspect, in which a plurality of other markers are provided on at least one end side of the white reference surface in the axial direction, and the processor controls the rotational speed of the rotating member according to the distance between each of the other markers and the reading reference position.

[0011] An image reading system according to a seventh aspect of the present disclosure is the image reading system according to the sixth aspect, wherein the different markers are linear markers and have different lengths.

[0012] An image reading system according to an eighth aspect of the present disclosure is the image reading system according to the sixth aspect, wherein the different marker is a linear marker and is different in at least one of the line color, the line type, and the line thickness.

[0013] A ninth aspect of the image reading system of the present disclosure is the image reading system of the first aspect, in which an arc-shaped support surface capable of supporting the original document being transported is provided on the outer periphery of the rotating member, and the processor controls the rotational position of the rotating member so that the support surface supports the original document when the original document passes between the rotating member and the reading unit.

[0014] An image forming system according to a tenth aspect of the present disclosure includes an image reading system according to any one of the first to ninth aspects that reads an image from a document, and an image forming unit that forms an image on a recording medium based on the read image information. Effect of the Invention

[0015] In the image reading system of the first embodiment, the variation in quality of the image after correction using the white reference data can be suppressed compared to a configuration in which a reference marker is provided only on one end side in the axial direction of the rotating member on the white reference surface.

[0016] In the second embodiment of the image reading system, the variation in quality of the image after correction using white reference data can be suppressed compared to a configuration in which a position away from the center position between the rotational positions of the rotating member at which each reference marker is read is set as the reading reference position.

[0017] In the image reading system of the third aspect, the range in which the reading reference position can be set can be expanded, compared to a configuration in which the reference marker is provided at a position away from the center in the width direction of the white reference surface.

[0018] In the image reading system of the fourth aspect, the reading reference position can be set with higher accuracy than in the case where the reference marker is a linear marker extending along the rotation direction of the rotating member.

[0019] In the image reading system of the fifth aspect, the speed control of the rotating member is easier than in a configuration in which the rotation speed of the rotating member is controlled without using a marker.

[0020] In the image reading system of the sixth aspect, the speed control of the rotating member is easier than in a configuration in which the rotation speed of the rotating member is controlled without using a marker.

[0021] In the image reading system of the seventh embodiment, a plurality of different markers can be individually distinguished from one another.

[0022] In the image reading system of the eighth embodiment, a plurality of different markers can be individually distinguished from one another.

[0023] In the image reading system of the ninth aspect, the document can be transported more smoothly than in a configuration in which the white reference surface faces the document during document transport.

[0024] In the image forming system of the tenth aspect, the variation in quality of the image after correction using the white reference data can be suppressed compared to a configuration in which a reference marker is provided only on one end side of the axial direction of the rotating member on the white reference surface. [Brief description of the drawings]

[0025] [Figure 1] 1 is a schematic diagram illustrating an image forming apparatus according to an embodiment of the present invention. [Diagram 2] 1 is a perspective view showing an image forming apparatus according to an embodiment of the present invention; [Diagram 3] 3 is a perspective view showing a state in which the document table has been moved to an open position in the configuration shown in FIG. 2. FIG. [Figure 4] 2 is a cross-sectional view showing an upper portion (image reading unit) of the image forming apparatus according to the present embodiment. [Diagram 5] 5 is a cross-sectional view showing a state in which the platen has been moved to an open position in the configuration shown in FIG. 4. [Figure 6] 2 is a plan view showing a state in which the document table of the image forming apparatus according to the embodiment has been moved to an open position. FIG. [Figure 7] 1 is a block diagram showing a hardware configuration of an image forming apparatus according to an embodiment of the present invention; [Figure 8] FIG. 2 is an enlarged view of the essential configuration of the image reading unit shown in FIG. 1, illustrating a state in which reading of a recording medium is being performed. [Figure 9] FIG. 2 is an enlarged view of the main components of the image reading unit shown in FIG. 1, showing a state in which reading of a white reference surface is being performed. [Figure 10] 2 is a schematic side view of a reading sensor and an opposing roll for explaining the relationship between the reading sensor and the opposing roll of the image reading unit shown in FIG. 1. [Figure 11] 4 is a plan view of the opposing roll when the white reference surface is viewed from the optical axis direction of the reading sensor. FIG. [Figure 12] 12 is a plan view of the opposing roll for explaining a method of determining a reference reading position of the white reference surface in a state in which the opposing roll shown in FIG. 11 is skewed. FIG. [Figure 13] 10 is a schematic side view of the opposing roll and the reading sensor for explaining the relationship between the opposing roll and the reading sensor when a skew occurs. FIG. [Figure 14] 10 is a schematic side view of the opposing roll and the reading sensor for explaining the relationship between the opposing roll and the reading sensor when a skew occurs. FIG. [Figure 15]10 is a flowchart for explaining an initial operation for acquiring white reference data. [Figure 16] 13 is a flowchart for explaining the second and subsequent operations for acquiring white reference data. [Figure 17] FIG. 13 is an enlarged plan view showing an end portion of a white reference surface of a modified example. [Figure 18] FIG. 13 is an enlarged plan view showing an end portion of the white reference surface of another modified example. [Figure 19] FIG. 11 is a plan view of the opposing roll, in which the deformed white reference surface is viewed from the optical axis direction of the reading sensor. [Figure 20] 20 is a plan view of the opposing roll for explaining a method of determining a reference reading position of the white reference surface in a state in which the opposing roll shown in FIG. 19 is skewed. FIG. [Figure 21] 11 is a schematic side view of the reading sensor and the opposing roll, showing the inclination of the white reference surface when the first skew detection marker is detected. FIG. [Figure 22] 11 is a schematic side view of the reading sensor and the opposing roll, showing the inclination of the white reference surface when the second skew detection marker is detected. FIG. [Diagram 23] FIG. 11 is a block diagram showing a hardware configuration of an image reading apparatus according to another embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0026] An example of an image reading system and an image forming system according to an embodiment of the present disclosure will be described with reference to Fig. 1 to Fig. 16. An image forming apparatus 10 shown in Fig. 1 is an example of an image forming system that forms an image on a recording medium P.

[0027] Arrow H in each drawing indicates the up-down direction (specifically, the vertical direction) of image forming apparatus 10. Arrow W indicates the width direction (specifically, the horizontal direction) of image forming apparatus 10. Arrow D indicates the depth direction (specifically, the horizontal direction) of image forming apparatus 10. The up-down direction, width direction, and depth direction of image forming apparatus 10 intersect with each other (specifically, perpendicular to each other).

[0028] Of the one side and the other side in the device width direction, the one side in the device width direction corresponds to the left side in image forming device 10. Therefore, hereinafter, the one side in the device width direction will be referred to as the left side. The other side in the device width direction corresponds to the right side in image forming device 10. Therefore, hereinafter, the other side in the device width direction will be referred to as the right side. These directions are determined for the convenience of explanation, and the device configuration is not limited to these directions.

[0029] Of the one side and the other side in the device depth direction, the one side in the device depth direction corresponds to the front of the image forming device 10. Therefore, hereinafter, the one side in the device depth direction will be referred to as the front. The other side in the device depth direction corresponds to the rear of the image forming device 10. Therefore, hereinafter, the other side in the device depth direction will be referred to as the rear. These directions are defined for the convenience of explanation, and the device configuration is not limited to these directions.

[0030] 1, the image forming apparatus 10 includes a conveying section 14, an image forming section 12, an image reading section 30, a conveying mechanism 40, a document table 50, a discharge section 60, and a document table 70. The image reading section 30 in this embodiment is an example of an image reading system.

[0031] 1, the transport unit 14 transports a recording medium P, such as paper, stored in a storage unit 16. Specifically, the transport unit 14 has a transport member 14A, such as a plurality of transport rolls, and transports the recording medium P by the transport member 14A.

[0032] [Image forming unit 12] 1, the image forming unit 12 is a part of the image forming apparatus 10 that has a function of forming an image on a recording medium P conveyed by a conveying unit 14. The image forming unit 12 forms an image on the recording medium P based on image information read by an image reading unit 30.

[0033] Specifically, the image forming unit 12 forms a toner image (one example of an image) on the recording medium P by an electrophotographic method. More specifically, the image forming unit 12 has toner image forming units 20Y, 20M, 20C, and 20K (hereinafter referred to as 20Y to 20K), a transfer body 24, and a fixing unit 26.

[0034] In the image forming unit 12, each of the toner image forming units 20Y to 20K performs the processes of charging, exposing, developing, and transferring, and forms a toner image of each color, yellow (Y), magenta (M), cyan (C), and black (K), on the transfer body 24. Furthermore, in the image forming unit 12, the toner image of each color formed on the transfer body 24 is transferred to the recording medium P, and the toner image is fixed to the recording medium P by the fixing unit 26. In this way, the image forming unit 12 uses an intermediate transfer method in which the image is transferred to the recording medium P via the transfer body 24.

[0035] [Image reading unit 30] As shown in FIG. 5 and FIG. 6, the image reading unit 30 is a part of the image forming apparatus 10 that has a function of reading an image of the document G being conveyed. As shown in FIG. 1, the image reading unit 30 is installed on the upper side of the image forming unit 12. In other words, the image reading unit 30 constitutes the upper part of the image forming apparatus 10. The image reading unit 30 has a housing 31, a reading sensor 32, a reading sensor 34, an opposing roll 42, an opposing roll 44, a white reference surface 46, and a reference marker 80. The reading sensor 32 and the reading sensor 34 of this embodiment are examples of the reading unit of the present disclosure. Also, the opposing roll 42 and the opposing roll 44 of this embodiment are examples of the rotating member of the present disclosure. Furthermore, the curved surface 43B of this embodiment is an example of the support surface of the present disclosure.

[0036] (Case 31) As shown in FIGS. 1, 4 and 5, the housing 31 accommodates the reading sensor 34, the transport path 39 and the transport mechanism 40 therein.

[0037] The transport path 39 is a path for transporting the document G placed on the document table 50 from the receiving opening 37 to the discharge opening 38 (i.e., the discharge section 60). Specifically, in Fig. 1, the transport path 39 extends from the receiving opening 37 to the back, curves in an arc midway, and extends toward the discharge opening 38. In the present embodiment, as an example, the transport path 39 extends in a C-shape from the receiving opening 37 to the discharge opening 38 (see Fig. 1).

[0038] The transport mechanism 40 is a mechanism that transports the document G along the transport path 39. Specifically, the transport mechanism 40 has a plurality of transport members such as transport rolls. Specifically, the transport mechanism 40 has transport members 40A, 40B, 40C, 40D, 40E, and 40F. The transport members 40A, 40B, 40C, 40D, 40E, and 40F are arranged in order from the upstream of the transport path 39.

[0039] (Read sensor 32) The reading sensor 32 is a component having a reading function of reading an image on one side (for example, the back side of the document G) of the document G being conveyed. Note that the one side of the document G in this embodiment is an example of the first side of the document G in this disclosure. As an example, a contact type image sensor called a CIS (Contact Image Sensor) is used as the reading sensor 32.

[0040] 1, 8, and 9, the reading sensor 32 is provided on the conveying path 39. In the present embodiment, as an example, the reading sensor 32 is disposed between a pair of conveying members 40C and a pair of conveying members 40D.

[0041] In this embodiment, as an example, the reading sensor 32 faces diagonally downward to the left as shown in FIGS.

[0042] (Reading sensor 34) The reading sensor 34 is a component having a reading function for reading an image on the other side of the transported document G (the side opposite to the one side of the document G, for example, the front side of the document G). The other side of the document G in this embodiment is an example of the second side of the document G in this disclosure. As an example of the reading sensor 34, a contact type image sensor called a CIS (Contact Image Sensor) is used.

[0043] 1, 8, and 9, the reading sensor 34 is provided on the conveying path 39. Specifically, the reading sensor 34 is disposed downstream of the reading sensor 32 on the conveying path 39. In the present embodiment, as an example, the reading sensor 32 is disposed between a pair of conveying members 40D and a pair of conveying members 40E.

[0044] In the present embodiment, as an example, the reading sensor 34 faces diagonally upward and to the left as shown in FIGS.

[0045] (opposing roll 42) 8 and 10, the opposing roll 42 is disposed opposite the reading sensor 32 across the transport path 39. The opposing roll 42 is a roll-shaped component, and is supported rotatably with the main scanning direction MS of the reading sensor 32 as its axial direction. The opposing roll 42 is also supported rotatably by a bearing (not shown) provided within the housing 31. In this embodiment, the main scanning direction MS of the reading sensor 32 is the same direction as the device depth direction.

[0046] 10, the opposing roll 42 has three flat surfaces 43A and a curved surface 43B that is curved in an arc. The three flat surfaces 43A and the curved surface 43B form the outer periphery of the opposing roll 42.

[0047] 8, the curved surface 43B is configured to be able to support the document G transported along the transport path 39. Specifically, the curved surface 43B supports the other surface of the document G.

[0048] The opposing roll 42 is configured to be rotatable by a drive source (not shown). This drive source is controlled by a processor 100, which will be described later. Specifically, the processor 100 controls the rotation direction, rotation angle, rotation speed, and the like of the opposing roll 42.

[0049] (White reference plane 46) As shown in FIG. 10, a flat white reference surface 46 is provided on the outer periphery of the opposing roll 42. This white reference surface 46 extends in the axial direction of the opposing roll 42. Specifically, a long white reference member is embedded in the flat surface 43A of the opposing roll 42 to form the white reference surface 46. Note that in this embodiment, the white reference surface 46 and the flat surface 43A are flush with each other, but the present disclosure is not limited to this configuration, and there may be a step between the white reference surface 46 and the flat surface 43A. The white reference surface 46 is, for example, a color reference surface for shading correction, and data serving as a white reference is read by the reading sensor 32.

[0050] (Reference marker 80) 11, the reference markers 80 are provided on the white reference surface 46 at both ends 46A in the axial direction of the opposing roll 42 (in other words, at both ends in the longitudinal direction of the white reference surface). Each reference marker 80 is a marker that is read by the reading sensor 32. Note that reading the reference markers 80 by the reading sensor 32 here refers to the reading sensor 32 detecting the reference markers 80 from the rotating opposing roll 42.

[0051] Each reference marker 80 is provided at the center of the width direction perpendicular to the longitudinal direction of the white reference surface 46. Each reference marker 80 is a linear marker extending along the longitudinal direction of the white reference surface 46. Note that in this embodiment, each reference marker 80 is a continuous linear marker (solid line marker), but the present disclosure is not limited to this configuration. For example, a marker of a line type such as a dashed line, a one-dot chain line, or a two-dot chain line may also be used.

[0052] In this embodiment, the white reference surface 46 is provided on each of the two flat surfaces 43A, but the present disclosure is not limited to this configuration, and the white reference surface 46 may be provided on one flat surface 43A.

[0053] In this embodiment, a black reference surface 48 is provided on the flat surface 43A on which the white reference surface 46 is not provided. This black reference surface 48 extends in the axial direction of the opposing roll 42. Specifically, a long black reference member is embedded in the flat surface 43A of the opposing roll 42 to form the black reference surface 48. Note that in this embodiment, the black reference surface 48 and the flat surface 43A are flush with each other, but the present disclosure is not limited to this configuration, and there may be a step between the black reference surface 48 and the flat surface 43A. The black reference surface 48 is a color reference surface, and data serving as the black reference is read by the reading sensor 32.

[0054] (opposing roll 44) 8 and 10, the opposing roll 44 is disposed opposite the reading sensor 34 across the transport path 39. The opposing roll 44 is a roll-shaped component, and is supported rotatably with the main scanning direction MS of the reading sensor 34 as its axial direction. The opposing roll 44 is also supported rotatably by a bearing (not shown) provided within the housing 31. In this embodiment, the main scanning direction of the reading sensor 34 is the same as the device depth direction.

[0055] 10, the opposing roll 44 has three flat surfaces 45A and a curved surface 45B that is curved in an arc. The three flat surfaces 45A and the curved surface 45B form the outer periphery of the opposing roll 44.

[0056] 8, the curved surface 45B is configured to be able to support the document G transported through the transport path 39. Specifically, the curved surface 45B supports one surface of the document G.

[0057] The opposing roll 44 is configured to be rotatable by a drive source (not shown). This drive source is controlled by a processor 100, which will be described later. Specifically, the processor 100 controls the rotation direction, rotation angle, rotation speed, and the like of the opposing roll 44.

[0058] As shown in FIG. 10, a flat white reference surface 46 is provided on the outer periphery of the opposing roll 44, similar to the opposing roll 42. This white reference surface 46 extends in the axial direction of the opposing roll 44. Specifically, a white reference member is embedded in the flat surface 45A of the opposing roll 44 to form the white reference surface 46. In this embodiment, the white reference surface 46 and the flat surface 45A are flush with each other, but the present disclosure is not limited to this configuration, and there may be a step between the white reference surface 46 and the flat surface 45A. In addition, the white reference surface 46 provided on the outer periphery of the opposing roll 44 is also provided with a reference marker 80 in the same manner as described above. Each reference marker 80 is a marker that is read (detected) by the reading sensor 34. In addition, in this embodiment, the white reference surface 46 is provided on each of the two flat surfaces 45A, but the present disclosure is not limited to this configuration, and the white reference surface 46 may be provided on one flat surface 45A. Furthermore, in this embodiment, a black reference surface 48 is provided on the flat surface 45A on which the white reference surface 46 is not provided. This black reference surface 48 extends in the axial direction of the opposing roll 44. Specifically, a long black reference member is embedded in the flat surface 45A of the opposing roll 44 to form the black reference surface 48. Note that, in this embodiment, the black reference surface 48 and the flat surface 45A are flush with each other, but the present disclosure is not limited to this configuration, and there may be a step between the black reference surface 48 and the flat surface 45A.

[0059] 3 and 5, the document table 50 is a table on which the document G, whose image is to be read by the image reading unit 30 (see FIG. 1), is placed. That is, the document table 50 is a portion on which the document G, which is to be transported by the transport mechanism 40 (see FIG. 1), is placed.

[0060] In this embodiment, as will be described later, when the platen 70 is in the open position, the document G is placed on the platen 50 from above.

[0061] In this embodiment, the term "original table" is used to mean something on which the original G is placed. Therefore, the term "table" does not include any specific meaning regarding the shape.

[0062] 1, the document table 50 is disposed on the right side of the image reading unit 30. Moreover, the document table 50 is disposed below the document table 70.

[0063] 3 and 7, a limiting portion 58 (so-called side guide) is provided on the document table 50. The limiting portion 58 comes into contact with a side edge of the document G placed on the document table 50, and limits the movement of the document G to one side and the other side in the device depth direction.

[0064] 5 is a portion where the document G, whose image has been read by the image reading unit 30, is discharged. In other words, the discharge unit 60 can also be said to be a portion where the document G transported by the transport mechanism 40 is placed.

[0065] The discharge section 60 is disposed below the document table 50 .

[0066] 2 and 4, the document table 70 is a table on which the document G is placed. The document table 70 is disposed above the document table 50.

[0067] Further, the manuscript table 70 is movable between a covering position (position shown in Figs. 1, 2 and 4) where it covers the manuscript table 50 from above, and an opening position (position shown in Figs. 3 and 5) where it opens the upper side of the manuscript table 50. In this embodiment, the manuscript table 70 is supported by the housing 31 so as to be movable between the covering position and the opening position.

[0068] As shown in FIGS. 3 and 5, when the document table 70 is in the open position, a part of the document G placed on the document table 50 is placed thereon.

[0069] Next, the hardware configuration of the image forming apparatus 10 of the present embodiment will be described with reference to Fig. 7. Note that Fig. 7 does not illustrate the entire hardware configuration of the image forming apparatus 10, but illustrates the main components of the image forming apparatus 10.

[0070] As shown in FIG. 7, the image forming apparatus 10 includes a processor 100, a storage unit 102, an operation unit 104, a display unit 106, a communication unit 108, an image forming unit 12, an image reading unit 30, and the like.

[0071] (Processor 100) The processor 100 includes a CPU (Central Processing Unit) 100A, a ROM (Read Only Memory) 100B, a RAM (Random Access Memory) 100C, and an input / output interface (I / O) 100D. The processor 100 controls the overall operation of the image forming apparatus 10. For example, the ROM 100B stores various control programs and various parameters in advance. The RAM 100C is used as a work area when the CPU 100A executes various programs. The storage unit 102 stores various programs and various data and application programs for executing print processing. The operation unit 104 is used to input various information. The display unit 106 is used to display various information. The communication unit 108 is an interface for transmitting and receiving various data to and from an external device such as a server. The communication unit 108 may be configured to be capable of directly communicating with each device using short-range wireless communication such as Wi-Fi (registered trademark) or Bluetooth (registered trademark). The components of the image forming apparatus 10 are electrically connected to one another via a system bus.

[0072] Next, the operation of the processor 100 of this embodiment will be described. However, since the operation of the processor 100 includes an operation to deal with skew of the opposing roll, first, skew of the opposing roll and what happens when skew occurs will be described.

[0073] When the image reading unit 30 is manufactured (assembled), the axial direction of the opposing roll may be slightly tilted with respect to the main scanning direction of the reading sensor when viewed from the optical axis direction of the reading sensor. When viewed from the optical axis direction of the reading sensor, the axial direction of the opposing roll is tilted with respect to the main scanning direction of the reading sensor, which is called skew. Skew refers to the relative tilt between the main scanning direction of the reading sensor and the axial direction of the opposing roll. FIG. 12 shows a state in which the opposing roll 42 is tilted with respect to the main scanning direction MS of the reading sensor 32. For example, when skew occurs in the opposing roll 42, as shown in FIG. 10, at one end of the opposing roll 42, the reference marker 80 may be located on the optical axis OL in an orthogonal state in which the white reference surface 46 is perpendicular to the optical axis OL of the reading sensor 32, and as shown in FIG. 13, at the other end of the opposing roll 42, the reference marker 80 may be located at a position shifted from the optical axis OL in an orthogonal state in which the white reference surface 46 is perpendicular to the optical axis OL of the reading sensor 32. Therefore, if the opposing roll 42 is skewed, the reference marker 80 is detected by the reading sensor 32 at one end of the opposing roll 42 when the white reference surface 46 is in the orthogonal state, and the reference marker 80 is detected by the reading sensor 32 at the other end of the opposing roll 42 when the white reference surface 46 is not in the orthogonal state, specifically, when the white reference surface 46 is in an inclined state inclined with respect to the optical axis direction of the reading sensor 32. Here, if the reference marker 80 detected when the white reference surface 46 shown in FIG. 14 is in the inclined state is set as the reading position of the white reference data, the incident light from the reading sensor 32 to the white reference surface 46 is obliquely incident on the white reference surface 46. In this way, when the incident light from the reading sensor 32 is obliquely incident on the white reference surface 46, the amount of reflected light is reduced compared to when the incident light is perpendicularly incident on the white reference surface 46, for example. As a result, a mismatch may occur between the white reference data for shading correction acquired by the reading sensor 32 and the image information of the original G read by the reading sensor 32, which may cause parts of the image after shading correction to become brighter or parts of the image to become blurred.

[0074] In consideration of the above, the processor 100 of this embodiment sets a reading reference position of the white reference data between the rotation positions of the opposing roll 42 when the respective reference markers 80 are read (detected) differently, and controls the reading sensor 32 to read at a position based on the reading reference position. In addition, in FIG. 12, the positions at which the reading sensor 32 detects each of the reference markers 80 on the white reference surface 46 are indicated by dashed lines of symbols DP1 and DP2, respectively. In addition, in FIG. 12, the reading reference position is set between the detection positions DP1 and DP2. This reading reference position is indicated by a dashed line of symbol BP. In addition, each dashed line shown in FIG. 12 is parallel to the main scanning direction MS of the reading sensor 32. In addition, the position based on the reading reference position includes the reading reference position. In other words, the processor 100 may control the reading sensor 32 to read at a reading reference position set between the rotation positions of the detected opposing roll 42.

[0075] Moreover, the processor 100 sets, as the reading reference position, the center position between the rotation positions of the opposing roll 42 at which each of the reference markers 80 is detected. Specifically, the processor 100 sets, as the reading reference position, the center position in the sub-scanning direction SS of the reading sensor 32 between the rotation positions of the opposing roll 42 at which each of the reference markers 80 is detected.

[0076] The processor 100 may also control the rotational position of the opposing roll 42 so that the curved surface 43B of the opposing roll 42 faces the conveying path 39 when the document G passes between the opposing roll 42 and the reading sensor 32, as shown in FIG. 8.

[0077] The processor 100 also controls the opposing roll 44 in the same manner as the opposing roll 42. Therefore, the description of the control of the opposing roll 44 by the processor 100 will be omitted.

[0078] Next, in this embodiment, the flow of processing by the processor 100 up to obtaining white reference data from the white reference surface 46 when skew occurs in the opposing roll will be described with reference to Fig. 15. Note that since both the opposing roll 42 and the opposing roll 44 are similarly controlled by the processor 100, the opposing roll 42 will be described as a representative in the following.

[0079] For example, when it is necessary to obtain white reference data for shading correction at the time of starting up the apparatus, first, in step S200, the opposing roll 42 is rotated.

[0080] Next, in step S202, the first reference marker 80 is detected from the white reference surface 46 of the rotating opposing roll 42 using the reading sensor 32. Then, the rotational position of the opposing roll 42 when the reading sensor 32 detects the first reference marker 80 is stored in the RAM 100C or the memory unit 102.

[0081] Next, in step S204, the second reference marker 80 from the white reference surface 46 of the rotating opposing roll 42 is detected by the reading sensor 32. Then, the rotational position of the opposing roll 42 when the reading sensor 32 detects the second reference marker 80 is stored in the RAM 100C or the memory unit 102.

[0082] Next, in step S206, a reading reference position of the white reference surface 46 is calculated. Specifically, the rotational position of the opposing roll 42 when the first reference marker 80 is detected and the rotational position of the opposing roll 42 when the second reference marker 80 is detected are read from the RAM 100C or the storage unit 102, and a position between the two rotational positions is calculated as the reading reference position. The calculated reading reference position is stored in the RAM 100C or the storage unit 102.

[0083] Next, in step S208, the opposing roll 42 is rotated.

[0084] Next, in step S210, the first reference marker 80 is detected from the white reference surface 46 of the rotating opposing roll 42 using the reading sensor 32. Then, the rotational position of the opposing roll 42 when the reading sensor 32 detects the first reference marker 80 is stored in the RAM 100C or the memory unit 102.

[0085] Next, in step S212, the rotation of the opposing roll 42 is stopped at the reading reference position. Specifically, the rotation amount of the opposing roll 42 is controlled so that the rotation of the opposing roll 42 stops at the reading reference position from the rotation position of the first reference marker 80 detected in step S210. For example, after calculating the reading reference position of the opposing roll 42, the rotation amount from the rotation position of the first reference marker 80 to the reading reference position of the opposing roll 42 is obtained. Then, in step S210, the opposing roll 42 is rotated according to the obtained rotation amount from the rotation position where the first reference marker 80 was detected. This makes it possible to stop the rotation of the opposing roll 42 at the reading reference position.

[0086] Then, in step S212, the reading sensor 32 obtains white reference data from the white reference surface 46 at the reading reference position.

[0087] Next, in this embodiment, the flow of processing by the processor 100 from the second time onwards until the white reference data is acquired from the white reference surface 46 in the case where a skew occurs in the opposing roll will be described with reference to Fig. 16. As in the above, the opposing roll 42 will be used as a representative example.

[0088] When it is necessary to further acquire white reference data for shading correction after the initial acquisition of white reference data, first, in step S300, the opposing roll 42 is rotated.

[0089] Next, in step S302, the first reference marker 80 is detected from the white reference surface 46 of the rotating opposing roll 42 using the reading sensor 32. Then, the rotational position of the opposing roll 42 when the reading sensor 32 detects the first reference marker 80 is stored in the RAM 100C or the memory unit 102.

[0090] Next, in step S304, the rotation of the opposing roll 42 is stopped at the previously calculated reading reference position. Specifically, the rotation amount of the opposing roll 42 is controlled so that the rotation of the opposing roll 42 is stopped at the reading reference position from the rotation position of the first reference marker 80 detected in step S302. For example, after calculating the reading reference position of the opposing roll 42, the rotation amount from the rotation position of the first reference marker 80 to the reading reference position of the opposing roll 42 is obtained. Then, in step S302, the opposing roll 42 is rotated according to the obtained rotation amount from the rotation position where the first reference marker 80 was detected. This makes it possible to stop the rotation of the opposing roll 42 at the reading reference position.

[0091] Next, in step S306, the reading sensor 32 is caused to obtain white reference data from the white reference surface 46 at the reading reference position.

[0092] Next, in step S308, the opposing roll 42 is rotated.

[0093] Next, in step S310, the second reference marker 80 from the white reference surface 46 of the rotating opposing roll 42 is detected by the reading sensor 32. Then, the rotational position of the opposing roll 42 when the reading sensor 32 detects the second reference marker 80 is stored in the RAM 100C or the memory unit 102.

[0094] Next, in step S312, the reading reference position of the white reference surface 46 is corrected. Specifically, the rotational position of the opposing roll 42 when the first reference marker 80 is detected in step S302 and the rotational position of the opposing roll 42 when the second reference marker 80 is detected in step S310 are read from the RAM 100C or the storage unit 102, and the position between the two rotational positions is calculated as the reading reference position. The calculated reading reference position is stored in the RAM 100C or the storage unit 102 as a new reading reference position of the white reference surface 46. In other words, the previous reading reference position of the white reference surface 46 is overwritten as the new reading reference position.

[0095] Next, the effects of the present embodiment will be described. In the following, the opposing roll 42 will be used as a representative opposing roll, and the reading sensor 32 will be used as a representative reading sensor, but the opposing roll 44 and the reading sensor 34 can also provide similar effects.

[0096] In this embodiment, when the rotational positions of the opposing roll 42 when the reference markers 80 are read (detected) are different, the processor 100 sets a reading reference position for the white reference data between the rotational positions of the opposing roll 42 that have been read, and controls the reading sensor 32 to read the white reference data at a position based on the reading reference position. Here, when the reading reference position for the white reference data is set between the rotational positions of the opposing roll 42 that have been read, the white reference surface 46 approaches a perpendicular state with respect to the optical axis OL of the reading sensor 32 at the reading reference position. For this reason, in this embodiment, as compared with a configuration in which the reference marker 80 is provided only on one end side of the white reference surface 46 in the longitudinal direction, for example, the variation in the amount of reflected light from the reading sensor 32 can be suppressed regardless of the rotational direction of the opposing roll 42, and therefore the variation in the quality of the image after correction (after shading correction) using the white reference data can be suppressed.

[0097] Furthermore, in this embodiment, the processor 100 sets the center position between the rotation positions of the opposing roll 42 where each of the reference markers 80 is read as the reading reference position. Here, since the processor 100 sets the above-mentioned center position as the reading reference position, it is possible to suppress variation in the amount of reflected light from the reading sensor 32 regardless of the rotation direction of the opposing roll 42, and to suppress variation in the quality of the image after shading correction, compared to a configuration in which, for example, a position away from the above-mentioned center position is set as the reading reference position.

[0098] Furthermore, in this embodiment, the reference marker 80 is provided at the center in the width direction of the white reference surface 46. Therefore, in this embodiment, the range in which the reading reference position can be set can be expanded compared to a configuration in which the reference marker 80 is provided at a position away from the center in the width direction of the white reference surface 46.

[0099] In addition, in this embodiment, the reference marker 80 is a linear marker extending along the axial direction of the opposing roll 42. Therefore, in this embodiment, the reading reference position can be set with higher accuracy than when the reference marker 80 is a linear marker extending along the rotation direction of the opposing roll 42.

[0100] Furthermore, in this embodiment, the processor 100 controls the rotational position of the opposing roll 42 so that the curved surface 43B supports the original G when the original G passes between the opposing roll 42 and the reading sensor 32. Therefore, in this embodiment, the original G can be supported by the curved surface 43B and transported more smoothly than in a configuration in which the processor 100 faces the white reference surface 46 toward the original G when transporting the original G.

[0101] Furthermore, in this embodiment, it is possible to suppress variation in the quality of the image after shading correction, compared to a configuration in which the reference marker 80 is provided only on one end 46A side in the longitudinal direction of the white reference surface 46. Therefore, it is possible to suppress variation in the quality of the image formed on the recording medium P by the image forming apparatus 10.

[0102] (Other embodiments) In the above embodiment, only the reference marker 80 is provided on both ends 46A of the white reference surface 46 in the longitudinal direction, but the present disclosure is not limited to this configuration. For example, as shown in FIG. 17, an adjustment marker 82 other than the reference marker 80 may be provided on at least one end 46A of the white reference surface 46. A plurality of adjustment markers 82 are provided on the white reference surface 46 at positions away from the reference marker 80 in the rotation direction of the opposing roll 42. Specifically, on the white reference surface 46, three adjustment markers 82 are provided on each side of the reference marker 80 in the width direction. Hereinafter, the adjustment markers are referred to as 82A, 82B, and 82C in order from the marker farthest from the reference marker 80. Note that when describing the adjustment markers as a representative, they are described as adjustment markers 82.

[0103] The above adjustment marker 82 is an example of another marker in the present disclosure. The adjustment markers 82 are linear markers, and each has a different length. Specifically, the adjustment markers 82 are shorter in length as they are farther away from the reference marker 80. That is, as shown in FIG. 17, the adjustment markers 82C, 82B, and 82A are shorter in length in this order. Note that the present disclosure is not limited to this configuration, and the adjustment markers 82 may be configured to be longer in length as they are farther away from the reference marker 80. By making the lengths of the adjustment markers 82 different in this way, the processor 100 can distinguish between the multiple adjustment markers 82.

[0104] The processor 100 may control the rotation speed of the opposing roll 42 when reading the adjustment marker 82 shown in FIG. 17. For example, when acquiring the white reference data, the processor 100 may control the rotation speed of the opposing roll 42 to be decelerated when the reading sensor 32 detects the adjustment marker 82 (for example, the adjustment marker 82A) before the opposing roll 42 reaches the reading reference position, and may control the rotation speed of the opposing roll 42 to be accelerated when the reading sensor 32 detects the adjustment marker 82 (for example, the adjustment marker 82C) after acquiring the white reference data. The processor 100 may control the rotation speed of the opposing roll 42 to be constant. In this way, the adjustment marker 82 for adjusting the speed of the opposing roll 42 is provided on the white reference surface 46, and the processor 100 controls the rotation speed of the opposing roll 42 when the adjustment marker 82 is read, thereby making it easier to control the speed of the opposing roll 42 compared to a configuration in which the rotation speed of the opposing roll 42 is controlled regardless of the marker.

[0105] The processor 100 may also control the rotation speed of the opposing roll 42 according to the distance between each adjustment marker 82 and the reading reference position, as shown in FIG. 17. For example, when acquiring the white reference data, the processor 100 may control the opposing roll 42 so that when the adjustment marker 82A is detected by the reading sensor 32 before the reading reference position is reached, the processor 100 decelerates the rotation speed of the opposing roll 42, when the adjustment marker 82B is detected, the processor 100 further decelerates the rotation speed of the opposing roll 42, when the adjustment marker 82C is detected. That is, the processor 100 may decelerate the rotation speed of the opposing roll 42 stepwise every time the processor 100 detects an adjustment marker 82 before the reading reference position is reached. The processor 100 may also control the rotation speed of the opposing roll 42 to be accelerated stepwise every time the processor 100 detects an adjustment marker 82 after acquiring the white reference data, or may control the rotation speed of the opposing roll 42 to be constant. In this way, the processor 100 controls the rotation speed of the opposing roll 42 in accordance with the distance between each adjustment marker 82 and the reading reference position, thereby making it possible to control the rotation speed of the opposing roll 42 in multiple stages. Therefore, speed control of the opposing roll 42 is easier than in a configuration in which the rotation speed of the opposing roll 42 is controlled regardless of the markers.

[0106] Also, instead of the adjustment marker 82, an adjustment marker 92 shown in FIG. 18 may be provided on the white reference surface 46. The adjustment marker 92 is a linear marker, and at least one of the line color, line type, and line thickness is different as it moves away from the reference marker 80. In FIG. 18, the line thickness becomes thinner as it moves away from the reference marker 80. Note that in FIG. 18, the adjustment markers 92A, 92B, and 92C are labeled in order from the marker farthest from the reference marker 80. In addition, when the type of line is changed as it moves away from the reference marker 80, for example, the markers may be configured to be a one-dot chain line, a two-dot chain line, a dashed line, and a dotted line in order from the marker closest to the reference marker 80. In addition, when the color of the line is changed as it moves away from the reference marker 80, for example, the markers may be configured to be red, green, and yellow in order from the marker closest to the reference marker 80, or the color may be configured to change in shade. By making each adjustment marker 92 different in at least one of the line color, line type, and line thickness in this manner, the processor 100 can distinguish between the multiple adjustment markers 92 .

[0107] 17 and 18 may be applied to the opposing roll 44. When applied to the opposing roll 44, the same effects as when applied to the opposing roll 42 are achieved.

[0108] In the above embodiment, the white reference data is read from the white reference surface 46 at the reading reference position, but the present disclosure is not limited to this configuration. For example, as shown in FIG. 20, a reading correction position may be used as a reading position based on the reading reference position. In FIG. 20, the reading correction position is indicated by a dashed line with the symbol AP. Also, the dashed line BP in FIG. 20 indicates the reading reference position. In order to obtain the reading correction position, as shown in FIG. 19, skew detection markers 96 are provided on both ends 46A of the white reference surface 46 in the longitudinal direction, on both sides in the width direction with the reference marker 80 as the center. Instead of the skew detection markers 96, both ends in the width direction of the white reference surface 46 may be regarded as markers. As shown in Figs. 21 and 22, the processor 100 judges that there is a skew when the angles θ of the two skew detection markers 96 with respect to the orthogonal plane (shown by a dashed line in Figs. 21 and 22) perpendicular to the optical axis OL of the white reference surface 46 when the two skew detection markers 96 are read (detected) are different from each other. When the processor 100 judges that there is a skew, it sets a position away from the reading reference position calculated from the reference marker 80 toward the skew detection marker 96 side where the angle θ between the white reference surface 46 and the orthogonal plane becomes smaller as a reading correction position. By reading the white reference data from the white reference surface 46 at such a reading correction position, it is possible to suppress the variation in the quality of the image after the shading correction, compared to a configuration in which the reference marker 80 is provided only on one end 46A side of the white reference surface 46. The difference in the angle θ obtained in the two skew detection markers 96 indicates the degree of skew of the opposing roll 32. Furthermore, the processor 100 determines that there is no skew if the angle θ of the white reference surface 46 with respect to the orthogonal surface when the reading sensor 32 detects the two skew detection markers 96 is the same.

[0109] 19 and 20 may be applied to the opposing roll 44. When applied to the opposing roll 44, the same effects as when applied to the opposing roll 42 are achieved.

[0110] In the above embodiment, the image reading unit 30 is provided at the top of the image forming device 10, and the image forming unit 12 is provided at the bottom, but the present disclosure is not limited to this configuration. For example, the image reading unit 30, the document tables 50, 60, and 70, and the processor 100 may form the image reading device 11. The hardware configuration of the image reading device 11 is shown in Fig. 23. Note that the image reading device 11 is an example of an image reading system in the present disclosure.

[0111] In the above embodiment, the image forming unit 12 is used as an example of the image forming unit in the present disclosure, but is not limited thereto. As an example of the image forming unit in the present disclosure, for example, a direct transfer method in which each of the toner image forming units 20Y to 20K forms a toner image directly on the recording medium P without using the transfer body 24 may be used. As an example of the image forming unit in the present disclosure, an image forming unit that ejects ink onto the recording medium P to form an image may be used. In other words, the image forming unit in the present disclosure is not particularly limited as long as it has a function of forming an image on the recording medium P.

[0112] Further, the image reading unit 30 in the above-described embodiment includes the reading sensors 32 and 34, but is not limited to this. The image reading unit 30 may be configured to include only one of the reading sensors 32 and 34. In other words, it is sufficient for the image reading unit 30 to be capable of reading an image on at least one side of the document G.

[0113] The present disclosure is not limited to the above-described embodiment, and various modifications, changes, and improvements are possible without departing from the spirit and scope of the present disclosure. For example, the above-described modified examples may be appropriately combined to form a configuration.

[0114] The following supplementary notes are further disclosed regarding the above embodiment.

[0115] (((1))) a reading unit provided in a transport path along which an original is transported, the reading unit reading an image from the original transported along the transport path; a rotating member disposed opposite the reading unit across the transport path and rotating about an axial direction of the main scanning direction of the reading unit; a flat white reference surface provided on an outer periphery of the rotating member, from which white reference data is read by the reading unit; a reference marker provided on each of both ends of the white reference surface in the axial direction and read by the reading unit; a processor that, when the rotational positions of the rotating member are different when the reference markers are read, sets a reading reference position of the white reference data between the rotational positions of the rotating member that have been read, and controls the reading unit to read at a position based on the reading reference position; An image reading system comprising:

[0116] (((2))) The image reading system according to (((1))), wherein the processor sets a central position between rotational positions of the rotating member at which each of the reference markers is read as the reading reference position.

[0117] (((3))) The image reading system according to (((1))) or (((2))), wherein the reference marker is provided at the center of the white reference surface in a width direction perpendicular to the axial direction.

[0118] (((4))) The image reading system according to any one of ((1))) to (((3))), wherein the reference marker is a linear marker extending along the axial direction of the rotating member.

[0119] (((5))) a second marker is provided on at least one end of the white reference surface in the axial direction, the second marker being spaced apart from the first marker in a rotation direction of the rotary member; The image reading system according to any one of ((1))) to (((4))), wherein the processor controls the rotation speed of the rotating member when the processor reads the other marker.

[0120] (((6))) a plurality of the other markers are provided on at least one end side of the white reference surface in the axial direction, The image reading system described in (((5))), wherein the processor controls the rotational speed of the rotating member depending on the distance between each of the other markers and the reading reference position.

[0121] (((7))) The image reading system described in (((6))), wherein the other markers are linear markers and each marker has a different length.

[0122] (((8))) The image reading system according to (((6))) or (((7))), wherein the other marker is a linear marker and differs in at least one of line color, line type, and line thickness.

[0123] (((9))) an arc-shaped support surface capable of supporting the document being transported is provided on an outer periphery of the rotating member; The image reading system of any one of (((1))) to (((8))), wherein the processor controls the rotational position of the rotating member so that the support surface supports the original document when the original document passes between the rotating member and the reading unit.

[0124] (((10))) An image reading system according to any one of (((1))) to (((9))) that reads an image from a document; an image forming unit that forms an image on a recording medium based on the read image information; An image forming system comprising:

[0125] In the image reading system (((1))), the variation in quality of the image after correction using the white reference data can be suppressed compared to a configuration in which a reference marker is provided on only one end of the axial direction of the rotating member on the white reference surface.

[0126] In the image reading system (((2))), the variation in quality of the image after correction using white reference data can be reduced compared to a configuration in which a position away from the center position between the rotational positions of the rotating member at which each reference marker is read is set as the reading reference position.

[0127] In the image reading system (((3))), the range in which the reading reference position can be set can be expanded, compared to a configuration in which the reference marker is provided at a position away from the center in the width direction of the white reference surface.

[0128] In the image reading system (((4))), the reading reference position can be set with greater precision than in the case where the reference marker is a linear marker that extends along the rotation direction of the rotating member.

[0129] In the image reading system of (((5))), control of the speed of the rotating member is easier than in a configuration in which the rotation speed of the rotating member is controlled without using a marker.

[0130] In the image reading system of (((6))), control of the speed of the rotating member is easier than in a configuration in which the rotation speed of the rotating member is controlled without using a marker.

[0131] The image reading system of (((7))) is capable of distinguishing between a number of different markers.

[0132] The image reading system of (((8))) is capable of distinguishing between a number of different markers.

[0133] In the image reading system of (((9))), the document can be transported more smoothly than in a configuration in which the white reference surface faces the document when the document is transported.

[0134] In the image forming system (((10))), variation in the quality of the image after correction using the white reference data can be suppressed compared to a configuration in which a reference marker is provided on only one end side of the axial direction of the rotating member on the white reference surface. [Explanation of symbols]

[0135] 10 Image forming device 12 Image forming section 30 Image reading unit (an example of an image reading system) 32 Reading sensor (an example of a reading unit) 34 Reading sensor (an example of a reading unit) 39 Transport Path 42 Counter roll (an example of a rotating member) 44 Counter roll (an example of a rotating member) 46 White reference plane 46A both ends 80 fiducial markers 82 Adjustment marker (another marker) 100 processors 120 processors MS Main scanning direction P Recording medium

Claims

1. a reading unit provided in a transport path along which an original is transported, the reading unit reading an image from the original transported along the transport path; a rotating member disposed opposite the reading unit across the transport path and rotating about an axial direction of the main scanning direction of the reading unit; a flat white reference surface provided on an outer periphery of the rotating member, from which white reference data is read by the reading unit; a reference marker provided on each of both ends of the white reference surface in the axial direction and read by the reading unit; a processor that, when the rotational positions of the rotating member are different when the reference markers are read, sets a reading reference position of the white reference data between the rotational positions of the rotating member that have been read, and controls the reading unit to read at a position based on the reading reference position; An image reading system comprising:

2. The image reading system according to claim 1 , wherein the processor sets a center position between rotational positions of the rotating member at which each of the reference markers is read as the reading reference position.

3. 2. The image reading system according to claim 1, wherein the reference marker is provided at a center of the white reference surface in a width direction perpendicular to the axial direction.

4. The image reading system according to claim 1 , wherein the reference marker is a linear marker extending along the axial direction of the rotating member.

5. a second marker is provided on at least one end of the white reference surface in the axial direction, the second marker being spaced apart from the reference marker in a rotation direction of the rotary member; The image reading system according to claim 1 , wherein the processor controls a rotation speed of the rotating member when the processor reads the other marker.

6. a plurality of the other markers are provided on at least one end side of the white reference surface in the axial direction, The image reading system according to claim 5 , wherein the processor controls a rotation speed of the rotating member in accordance with a distance between each of the other markers and the reading reference position.

7. The image reading system according to claim 6 , wherein the different markers are linear markers, each having a different length.

8. The image reading system according to claim 6 , wherein the different marker is a linear marker and is different in at least one of a line color, a line type, and a line thickness.

9. an arc-shaped support surface capable of supporting the document being transported is provided on an outer periphery of the rotating member; The image reading system according to claim 1 , wherein the processor controls a rotational position of the rotating member such that the support surface supports the document when the document passes between the rotating member and the reading unit.

10. An image reading system according to any one of claims 1 to 9, which reads an image from a document; an image forming unit that forms an image on a recording medium based on the read image information; An image forming system comprising:

Images