JP2007176119A - Inkjet recorder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a conveyance mechanism of an inkjet recorder in which a change of a conveyance gap of a paper between when a rear part of the paper is pressed in contact by a paper feeding roller and when the rear part is released from the pressing of the paper feeding roller is small. <P>SOLUTION: A conveyance gap amount in the case where the paper is pressed in contact by the paper feeding roller, and a conveyance gap amount in the case where the paper is not pressed by the paper feeding roller are checked beforehand. A conveyance correction value with a conveyance correction amount added according to the conveyance gap amount in each case is stored in a memory region for correction value data set in a ROM. The conveyance correction value in each case is read out from the memory region for the correction value data set in the ROM (S128 and S130). An ASIC makes the paper conveyed on the basis of the conveyance correction value of each case read out by controlling a motor driving part (S132). <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an ink jet recording apparatus, and more particularly to a paper transport technique for correcting a paper transport deviation.

2. Description of the Related Art Conventionally, ink jet recording apparatuses that perform image recording on a recording medium by discharging ink stored in an ink tank from a nozzle of a recording head are known.
In such a transport mechanism of an ink jet recording apparatus, a paper feeding unit capable of storing a plurality of sheets cut into A4 size and the like, and a paper feeding unit that separates and feeds the paper stored in the paper feeding unit one by one. A paper roller, a transport roller for transporting the paper sent out by the paper feed roller to the bottom of the recording head, a pinch roller disposed opposite to the transport roller, and a paper after image formation. 2. Description of the Related Art There is known a paper discharge roller that discharges to a paper discharge unit and a pinch roller (a spur roller) that is opposed to the paper discharge roller while being pressed against the paper discharge roller.

Here, the main factors that cause the difference between the theoretical transport amount of the paper transport and the actual transport amount will be described below. The theoretical transport amount refers to a calculated transport amount.
For example, when the radius of the conveyance roller is “r”, the calculated conveyance amount of the sheet by one rotation of the conveyance roller is “2 × π (circumferential ratio) × r”. However, the radius of the transport roller is “r ± δ” due to the manufacturing error ± δ. The actual conveyance amount of the sheet by one rotation of the conveyance roller is “2 × π (circumferential ratio) × (r ± δ)”. Therefore, a difference in the conveyance amount of “2 × π (circumferential ratio) × (± δ)” occurs between the theoretical conveyance amount and the actual conveyance amount.

In addition, when slip occurs between the paper and the transport roller or the paper discharge roller, the theoretical transport amount of the paper is different from the actual transport amount.
Further, the theoretical transport amount and the actual transport amount of the paper are also determined by play (backlash) of a transport roller, a discharge roller, and a drive source for driving them, such as a mechanism connected to a DC motor, for example, a gear coupling mechanism. Is different.

For this reason, the conveyance mechanism of the ink jet recording apparatus is provided with correction means for correcting a conveyance deviation between the theoretical conveyance amount and the actual conveyance amount of the sheet (see, for example, Patent Documents 1 and 2). .
JP 2002-254736 A (page 4) JP 2001-88377 A (page 3)

  However, in the transport mechanism of the ink jet recording apparatus as described above, as described below, the case where the rear portion of the paper is pressed by the paper feed roller and the case where the paper feed roller is released from the pressure contact, There has been a problem in that the conveyance deviation of the paper changes and printing unevenness occurs.

The process of separating and sending the sheets stored in the sheet feeding unit one by one is executed as follows.
First, the paper feed roller is rotated in a state where the paper feed roller is pressed against the uppermost paper among the paper stacked and placed on the paper feed unit, and only the uppermost paper is separated to separate the uppermost paper. The leading edge of the upper sheet is conveyed to the contact point between the conveying roller and the pinch roller.

  When the transport roller rotates in the transport direction, the sheet is drawn between the transport roller and the pinch roller and is sandwiched between the transport roller and the pinch roller. Thereafter, the sheet is conveyed to the sheet discharge roller side which is the conveying direction along with the rotation of the conveying roller. Note that when the transport roller rotates, the paper feed roller is configured to idle without receiving a rotational force.

  When the leading edge of the sheet is conveyed to the contact point between the conveying roller and the pinch roller and is sandwiched between the conveying roller and the pinch roller, the rear part of the sheet is a non-separated sheet stacked on the sheet feeding roller and the sheet feeding unit. It is left in the position where it was pressed between.

  In this state, when the leading edge of the sheet is conveyed by the conveying roller and the pinch roller, the rear part of the sheet is pressed by the sheet feeding roller and thus receives a conveyance resistance due to a coefficient of friction with the sheet that is not separated. . When the rear portion of the sheet receives conveyance resistance, slip occurs between the conveyance roller and the sheet, and the conveyance deviation of the sheet increases.

  When the sheet is conveyed in the conveying direction by the conveying roller and the pinch roller and the rear part of the sheet is removed from the position of the paper feed roller, the rear part of the sheet is released from the conveyance resistance due to the coefficient of friction with the sheet that is not separated. That is, since the rear portion of the sheet is not subjected to conveyance resistance, slip does not occur between the conveyance roller and the sheet, and conveyance deviation of the sheet is reduced.

  Therefore, there is a problem in that the paper conveyance deviation changes between the case where the rear portion of the paper is pressed by the paper feed roller and the case where the rear of the paper is released from the pressure contact of the paper feed roller, and printing unevenness occurs.

  In particular, in high-quality printing such as photographs, printing unevenness due to a change in paper conveyance deviation becomes more obvious than in general printing. In high-quality printing such as photographs, printing on glossy paper is more frequent than printing on ordinary plain paper.

  For example, in a plain paper having a thickness of about 90 μm, the friction coefficient between the paper and the paper is about 0.4, but in a glossy paper having a thickness of about 225 μm, the friction coefficient between the paper and the paper is about 0.6. That is, the friction coefficient between glossy paper sheets with a thickness of about 225 μm is about 1.5 times the friction coefficient between plain paper sheets with a thickness of about 90 μm. Therefore, the conveyance resistance received by the rear part of the paper when the rear part of the paper is pressed by the paper feed roller is larger in the case of glossy paper than in the case of plain paper. Therefore, when printing on glossy paper, compared to plain paper, paper is transported when the rear part of the paper is pressed by the paper feed roller and when it is released from the pressure of the paper feed roller. There has been a problem that the change in misalignment becomes large and printing unevenness becomes more apparent.

  In addition, in order to improve the operability of storing paper in the paper feeding unit, an ink jet recording apparatus in which the paper feeding unit is provided on the front side has appeared. In such an ink jet recording apparatus, the sheets separated and sent one by one by the sheet feed roller from the sheet feed unit provided on the front side are reversed 180 degrees and discharged from the discharge roller on the front side. That is, the sheet is conveyed so as to draw a 180-degree curvature (hereinafter referred to as curvature conveyance). Then, compared to the case where the sheet is conveyed linearly, the sheet is more easily subjected to conveyance resistance by the conveyance guide when the sheet is conveyed with curvature. In other words, the sheet conveyed with curvature is pressed against the conveyance guide by the rigidity of the sheet, and is subjected to conveyance resistance due to its frictional resistance.

  In such an ink jet recording apparatus, further downsizing of the apparatus is required. In particular, it is required to reduce the size in the height direction in which the apparatus is installed. Therefore, when the sheet is conveyed with curvature, it is required to make the curvature radius smaller. The conveyance resistance received by the sheet increases as the radius of curvature decreases. Therefore, the conveyance resistance received by the sheet is further increased by downsizing the apparatus.

Further, as will be described below, glossy paper frequently used in high-quality printing such as photographs has a higher conveyance resistance than plain paper. For example, in a general plain paper having a thickness of about 90μm to be used in printing, the stiffness of the paper is about 80 cm ^3/100, in the glossy paper having a thickness of about 225 .mu.m, stiffness of the paper is about 450 cm ³ / 100. That is, the rigidity of glossy paper having a thickness of about 225 μm is about 5.6 times that of plain paper having a thickness of about 90 μm. Therefore, the conveyance resistance due to the frictional resistance by which the sheet is pressed against the conveyance guide due to the rigidity of the sheet is larger in the case of glossy paper than in the case of plain paper.

  Accordingly, the sheet transport resistance varies depending on the type of paper to be printed, such as plain paper or glossy paper. In other words, there is a problem that the conveyance deviation of the paper changes depending on the type of the paper and printing unevenness occurs.

  The present invention has been made in view of such problems, and the object of the present invention is based on the case where the rear portion of the paper is pressed by the paper feed roller and the case where the rear of the paper is released from the pressure contact of the paper feed roller. It is an object of the present invention to provide a transport mechanism for an ink jet recording apparatus in which a change in paper transport deviation is small and a change in paper transport deviation due to the type of paper is small.

  Inkjet recording apparatus of the present invention, which has been made to solve the above-described problems (1: In this section, in order to facilitate understanding of the present invention, “Best Mode for Carrying Out the Invention” is necessary as necessary. The components described in the column “” are shown in parentheses, but this description does not mean that the scope of the claims is limited.) Is a recording head (15 ), A carriage (17) mounted with a recording head and reciprocatingly moved in a predetermined direction, a paper feed unit (4) capable of holding a plurality of sheets, and a sheet stored in the paper feed unit one by one Separating means (9b) for sending out and conveying means (41) for intermittently carrying the paper sent out by the separating means in a direction substantially perpendicular to the predetermined direction when the recording head is not discharging ink. , It comprises a 2), or the conveyance position of the paper is in the first transport section, or if the determination means (60) in a second transport section, the.

  Further, the ink jet recording apparatus of the present invention controls the separating unit to separate and send out the sheets stored in the sheet feeding unit one by one, controls the conveying unit to convey the sent out sheet, The determination unit is controlled to determine whether the paper transport position is in the first transport section or the second transport section, and the recording head and the carriage are controlled to move the carriage and the recording head. The control means (60) for executing the printing process for storing the image on the paper by repeatedly performing the ink ejection by the ink and the intermittent conveyance by the conveyance means, and the first conveyance corresponding to the first conveyance section Storage means (62) in which the correction value and the second transport correction value corresponding to the second transport section are stored.

  When the determination unit determines that the sheet conveyance position is in the first conveyance section, the control unit reads the first conveyance correction value stored in the storage unit, and reads the first read-out value. When the conveyance unit is controlled to convey the sheet based on the conveyance correction value and the determination unit determines that the sheet conveyance position is in the second conveyance section, the second stored in the storage unit is stored. The conveyance correction value is read, and the conveyance unit is controlled to convey the sheet based on the read second conveyance correction value.

  As described above, the ink jet recording apparatus of the present invention includes a determination unit that determines whether the transport position of the sheet transported by the transport unit is in the first transport section or the second transport section, Since the storage unit storing the first conveyance correction value corresponding to one conveyance section and the second conveyance correction value corresponding to the second conveyance section is provided, conveyance in which the sheet is conveyed When the conveyance resistance of the paper varies depending on the section, the conveyance deviation can be corrected by setting an appropriate conveyance correction value for each conveyance section. For example, if the first transport section is a section in which the paper remains in the separating means and the second transport section is a section away from the separating means, even if the paper transport deviation changes in each transport section. By setting an appropriate conveyance correction value for each conveyance section, it is possible to correct conveyance deviation in each conveyance section. That is, it is possible to reduce variations in paper conveyance deviation between when the paper remains in the separating unit and when the paper is separated from the separating unit, thereby preventing uneven printing. The separating means is, for example, a sheet feeding roller that separates one sheet at a time by being brought into pressure contact with the uppermost sheet among the sheets stored in the sheet feeding unit. The section remaining in the separating unit is a section that is pressed by, for example, a sheet feeding roller, and the section that is separated from the separating unit is a section that is not pressed by, for example, a sheet feeding roller.

Further, the number of sheets accommodated in the sheet feeding unit is not limited to one type, and as described in claim 2, it is preferable to be able to cope with a plurality of types of sheet sizes.
That is, in the ink jet recording apparatus according to claim 1, acquisition means (86) for acquiring a plurality of types of paper sizes having different length dimensions in the paper conveyance direction, and conveyance of the paper corresponding to the different paper sizes. Paper size storage means (62) for storing the length of the direction.

Further, the paper feed unit is configured to be capable of accommodating a plurality of different sheets.
The determination unit reads the length dimension in the sheet conveyance direction corresponding to the sheet size acquired by the acquisition unit from the sheet size storage unit, and detects the read length dimension in the sheet conveyance direction. It may be determined based on the paper transport position detected by the means whether the paper transport position is in the first transport section or the second transport section.

  According to the ink jet recording apparatus of the present invention configured as described above, even when the length of the paper in the transport direction is different, the transport resistance of the paper varies depending on the transport section in which the paper is transported. The conveyance deviation can be corrected by setting an appropriate conveyance correction value in the conveyance section. For example, if the second conveyance section is fixed, the length dimension in the sheet conveyance direction corresponding to the sheet size is stored, and the length dimension in the sheet conveyance direction corresponding to the acquired sheet size is stored. Can be calculated by subtracting the second conveyance section from the length dimension in the sheet conveyance direction. For example, when the longitudinal direction of A4 size paper is the transport direction, the length dimension in the transport direction is 297 mm. When the longitudinal direction of A3 size paper is the transport direction, the length dimension in the transport direction is Is 420 mm. If both the A4 size paper and the A3 size paper have a second transport interval of 100 mm, the first transport interval of the A3 size paper can be calculated as 420 mm-100 mm = 320 mm. The first conveyance section can be calculated as 297 mm-100 mm = 197 mm. In other words, even for papers with different length dimensions in the paper transport direction, the change in paper transport misalignment between the case where the paper remains on the separating unit and the case where the paper is separated from the separating unit is reduced. Can be prevented. Note that the case where the sheet remains in the separating unit is, for example, a case where the sheet is pressed by a sheet feeding roller, and the case where the sheet is separated from the separating unit, for example, is a case where the sheet is not pressed by a sheet feeding roller.

Further, as described in claim 3, the case where the sheet remains in the separating unit and the case where the sheet is separated from the separating unit may be directly detected.
That is, in the ink jet recording apparatus according to claim 1, the rear end detection unit (10) for detecting that the paper sent by the separation unit is separated from the separation unit is provided, and the determination unit includes the rear end detection unit, If it is not detected that the paper is separated from the separating means, the paper transport position is in the first transport section, and if it is detected that the paper is separated from the separating means, the paper transport position is the second transport section. It is good to determine that it is in the section.

  According to the ink jet recording apparatus of the present invention configured as described above, the sheet transport resistance is also different depending on the transport section in which the sheet is transported even for the sheets having different length dimensions in the sheet transport direction as in the second aspect. When they are different from each other, the conveyance deviation can be corrected by setting an appropriate conveyance correction value for each conveyance section. Note that the detection that the sheet is separated from the separating unit means that, for example, a state in which the sheet is not pressed by a sheet feeding roller is detected. The trailing edge detecting means is provided at a position where the sheet can be detected, for example, in the direction of a tangent line where the sheet feeding roller and the sheet are pressed against each other. The trailing edge detecting means is, for example, a laser type displacement sensor, and detects a step in the thickness of the sheet at the trailing edge of the sheet. For example, since the thickness of plain paper is about 90 μm, a step difference in the thickness of the paper can be detected by a laser displacement sensor having a resolution of about 10 μm.

  Further, in the ink jet recording apparatus according to any one of claims 1 to 3, the type of paper accommodated in a plurality of sheets in the paper feed unit is not limited to one type, and a plurality of types as described in claim 4. It is better to be able to handle this paper.

That is, the ink jet recording apparatus according to any one of claims 1 to 3, further comprising a sheet type obtaining unit (86) that obtains one kind of a plurality of kinds of sheets.
The storage unit stores a first conveyance correction value and a second conveyance correction value corresponding to the plurality of types of sheets.

  When the determination unit determines that the sheet transfer position is in the first transfer section, the control unit sets the first transfer correction value corresponding to the sheet type acquired by the sheet type acquisition unit. When the conveyance unit is controlled to convey the sheet based on the read first conveyance correction value read from the storage unit, and the determination unit determines that the sheet conveyance position is in the second conveyance section, The second conveyance correction value corresponding to the paper type acquired by the paper type acquisition unit may be read from the storage unit, and the conveyance unit may be controlled to convey the sheet based on the read second conveyance correction value.

  According to the ink jet recording apparatus of the present invention configured as described above, even with respect to a sheet having a different friction coefficient between sheets and a sheet having a different thickness, the sheet conveyance resistance varies depending on the conveyance section in which the sheet is conveyed. When they are different from each other, the conveyance deviation can be corrected by setting an appropriate conveyance correction value for each conveyance section. In addition, as described in the above-mentioned “Problem to be Solved by the Invention”, a paper having a different friction coefficient between paper and a paper having a different thickness is, for example, a plain paper having a thickness of about 90 μm or a thickness. It is a glossy paper with a thickness of about 225 μm. For example, in the case of plain paper having a thickness of about 90 μm, the friction coefficient between the paper and the paper is about 0.4, whereas in the glossy paper having a thickness of about 225 μm, the friction coefficient between the paper and the paper is about 0.1. 6 and different. Therefore, the conveyance resistance received by the sheet when the sheet remains in the separating unit is larger in the case of glossy paper than in the case of plain paper.

  Therefore, even for papers with different friction coefficients between papers and papers with different paper thicknesses, changes in paper transport deviations depending on whether the paper remains on the separation means or away from the separation means And printing unevenness can be prevented.

  Further, in the ink jet recording apparatus according to any one of claims 1 to 3, the type of paper stored in a plurality of sheets in the paper feeding unit is set as the glossiness of the surface of the paper as described in claim 5. You may make it detect and determine.

That is, the ink jet recording apparatus according to any one of claims 1 to 3, further comprising a glossiness detecting means (12) for detecting the glossiness of the surface of the paper.
The storage unit stores a first transport correction value and a second transport correction value corresponding to the glossiness of the surface of the paper.

  When the determination unit determines that the sheet conveyance position is in the first conveyance section, the control unit performs the first conveyance corresponding to the glossiness of the surface of the sheet detected by the glossiness detection unit. When the correction unit reads the correction value from the storage unit, controls the conveyance unit to convey the sheet based on the read first conveyance correction value, and the determination unit determines that the sheet conveyance position is in the second conveyance section In this case, the second conveyance correction value corresponding to the glossiness of the surface of the sheet detected by the glossiness detection unit is read from the storage unit, and the conveyance unit is configured to convey the sheet based on the read second conveyance correction value. It is good to control.

  According to the inkjet recording apparatus of the present invention configured as described above, the type of paper, for example, plain paper or glossy paper, can be determined by detecting the glossiness of the surface of the paper. As described above, the friction coefficient between paper sheets differs between plain paper and glossy paper. If it is determined that the paper is plain paper, the first transport correction value and the second transport correction value corresponding to the plain paper can be read out. If it is determined that the paper is glossy, the first transport correction value and the second transport correction value corresponding to the glossy paper can be read. The glossiness detection means is, for example, a visible light red LED glossiness discrimination sensor, and detects how much the light irradiated at a certain angle with respect to the paper rebounds to the same diagonal.

  Therefore, even when the paper has a different friction coefficient depending on the type of paper, by detecting the gloss level of the surface of the paper and determining the paper type, the paper remains in the separating means, and It is possible to reduce a change in paper conveyance deviation due to the case where the separation unit is away from the separation unit and to prevent uneven printing.

  Further, in the ink jet recording apparatus according to any one of claims 1 to 3, the number of paper feed units that can accommodate a plurality of sheets is not limited to one, and a plurality of paper feeds as described in claim 6. It is good to be able to cope with the part.

  That is, in the ink jet recording apparatus according to any one of claims 1 to 3, the plurality of sheets can be accommodated and each has different identification information, and corresponds to the plurality of sheet feeding units. And a separating unit that separates and feeds the stored sheets one by one, and a sheet feeding unit information acquisition unit (86) that acquires one piece of identification information from the plurality of sheet feeding units.

The storage unit stores a first transport correction value and a second transport correction value corresponding to the identification information of the plurality of paper feeding units, respectively.
When the determination unit determines that the sheet conveyance position is in the first conveyance section, the control unit detects the first conveyance correction value corresponding to the identification information acquired by the sheet feeding unit information acquisition unit. Is read from the storage means, the conveyance means is controlled to convey the sheet based on the read first conveyance correction value, and the determination means determines that the sheet conveyance position is in the second conveyance section. The second conveyance correction value corresponding to the identification information acquired by the paper feed unit information acquisition unit may be read from the storage unit, and the conveyance unit may be controlled to convey the sheet based on the read second conveyance correction value. .

  According to the ink jet recording apparatus of the present invention configured as described above, the sheets stored in the plurality of sheet feeding units are respectively changed according to the shape and distance of the conveyance path that is sent from each sheet feeding unit and conveyed. The conveyance deviation can be corrected by appropriately setting the first conveyance correction value and the second conveyance correction value. That is, for each of the plurality of paper feeding units, it is possible to reduce a change in paper conveyance deviation between when the paper remains in the separating unit and when the paper is separated from the separating unit, and to prevent uneven printing.

  Further, in the ink jet recording apparatus according to claim 4, the number of paper feed units that can accommodate a plurality of sheets is not limited to one, and as described in claim 7, the paper feed unit can be adapted to a plurality of paper feed units. Good.

  That is, in the ink jet recording apparatus according to claim 4, a plurality of paper sheets that can accommodate a plurality of sheets and have different identification information, and a sheet that is accommodated corresponding to each of the plurality of sheet feed sections. Separating means for separating and sending one sheet at a time, and sheet feeding unit information obtaining means (86) for obtaining one piece of identification information among a plurality of sheet feeding units.

The storage unit stores a first transport correction value and a second transport correction value corresponding to the identification information of the plurality of paper feeding units and the types of paper, respectively.
When the determination unit determines that the paper transport position is in the first transport section, the control unit acquires the identification information acquired by the paper feed unit information acquisition unit and the paper type acquisition unit. The first transport correction value corresponding to the type of paper is read from the storage means, the transport means is controlled to transport the paper based on the read first transport correction value, and the transport position of the paper is determined by the determination means. If it is determined that it is in the second conveyance section, the second conveyance correction value corresponding to the identification information acquired by the paper feed unit information acquisition unit and the paper type acquired by the paper type acquisition unit is stored. The conveyance unit may be controlled so as to convey the sheet based on the read second conveyance correction value.

According to the ink jet recording apparatus of the present invention configured as described above, the same effect as in the sixth aspect is obtained.
Further, in the ink jet recording apparatus according to claim 5, the number of paper feeding units capable of accommodating a plurality of sheets is not limited to one, and as described in claim 8, the paper feeding units can be adapted to a plurality of paper feeding units. Good.

  That is, in the ink jet recording apparatus according to claim 5, a plurality of paper sheets that can accommodate a plurality of sheets and have different identification information, and sheets that are respectively accommodated corresponding to the plurality of paper feed sections. Separating means for separating and sending the sheets one by one, and paper feeding section information obtaining means (86) for obtaining one piece of identification information among the plurality of paper feeding sections.

The storage unit stores a first conveyance correction value and a second conveyance correction value corresponding to the identification information of the plurality of paper feeding units and the glossiness of the surface of the paper, respectively.
When the determination unit determines that the sheet conveyance position is in the first conveyance section, the control unit detects the identification information acquired by the sheet feeding unit information acquisition unit and the gloss level detection unit. The first conveyance correction value corresponding to the glossiness of the surface of the sheet is read from the storage unit, the conveyance unit is controlled to convey the sheet based on the read first conveyance correction value, and the determination unit conveys the sheet. When it is determined that the position is in the second conveyance section, the second information corresponding to the identification information acquired by the paper feed unit information acquisition unit and the gloss level of the surface of the paper detected by the gloss level detection unit. The conveyance means may be read from the storage means, and the conveyance means may be controlled to convey the sheet based on the read second conveyance correction value.

According to the ink jet recording apparatus of the present invention configured as described above, the same effect as in the sixth aspect is obtained.
Further, the detection of the separation of the sheet from the separating unit is performed by detecting a change point of the conveyance deviation of the conveyed sheet and detecting the conveyance position of the detected change point of the conveyance deviation. You may determine based on.

  That is, an ink jet recording apparatus according to a ninth aspect includes a recording head (15) capable of selectively ejecting ink toward paper, a carriage (17) mounted with the recording head and reciprocating in a predetermined direction, A sheet feeding unit (4) capable of accommodating a plurality of sheets, a separating means (9b) for separating and feeding the sheets accommodated in the sheet feeding unit one by one, and when the recording head does not eject ink , Conveying means (41, 42) for intermittently conveying the sheet sent by the separating means in a direction substantially orthogonal to the predetermined direction, and detecting means (14) for detecting the conveying position of the sheet conveyed by the conveying means. And).

  According to a ninth aspect of the present invention, the ink jet recording apparatus controls the separating means to separate and send out the paper stored in the paper feed unit one by one, and controls the conveying means to control the sent paper. In addition to transporting, the recording head and the carriage are controlled, and a printing process for recording an image on the paper is executed by repeatedly moving the carriage, discharging ink by the recording head, and intermittently transporting by the transporting unit. Control means (60), and a storage means (62) in which a first transport correction value and a second transport correction value are stored.

  The control unit reads the first conveyance correction value stored in the storage unit, controls the conveyance unit to convey a predetermined amount of paper based on the read first conveyance correction value, and performs the predetermined amount conveyance. Each time, the sheet conveyance amount corresponding to the predetermined amount is calculated based on the sheet conveyance position detected by the detection means (14), and the difference between the calculated sheet conveyance amount and the predetermined amount is calculated. When the calculated difference or the accumulated value of the difference exceeds a predetermined value, the second conveyance correction value stored in the storage unit is read, and the sheet is conveyed based on the read second conveyance correction value. The conveying means is controlled.

  According to the ink jet recording apparatus of the present invention configured as described above, the sheet transport resistance is also different depending on the transport section in which the sheet is transported even for the sheets having different length dimensions in the sheet transport direction as in the second aspect. When they are different from each other, the conveyance deviation can be corrected by setting an appropriate conveyance correction value for each conveyance section. Note that the conveyance of a predetermined amount of paper may be, for example, a single conveyance amount that is intermittently conveyed. The predetermined value is, for example, about a difference between a conveyance deviation at a predetermined conveyance amount in a section where the paper remains in the separation unit and a conveyance deviation at a predetermined conveyance amount in a section where the paper is separated from the separation means. 50% is recommended. In this way, it is possible to stably detect the change point of the conveyance deviation of the conveyed paper with respect to the variation in the mechanical conveyance amount for each apparatus of the inkjet recording apparatus.

  Further, in the ink jet recording apparatus according to claim 9, the type of paper stored in the paper feeding unit is not limited to one type, and can support a plurality of types of paper as described in claim 10. Good.

  That is, in the ink jet recording apparatus according to claim 9, the ink jet recording apparatus includes a sheet type acquisition unit (86) for acquiring one sheet type among a plurality of types of sheets, and the storage unit corresponds to the plurality of types of sheets. Each stores a first transport correction value and a second transport correction value.

  Then, the control unit reads the first transport correction value corresponding to the paper type acquired by the paper type acquisition unit from the storage unit, and transports the paper by a predetermined amount based on the read first transport correction value. Controlling the conveying means so as to calculate the paper conveyance amount corresponding to the predetermined amount based on the paper conveyance position detected by the detection means each time the predetermined amount is conveyed, and the calculated paper conveyance amount; A difference from the predetermined amount is calculated, and when the calculated difference or a cumulative value of the difference exceeds a predetermined value, a second transport correction value corresponding to the paper type acquired by the paper type acquisition unit is stored. It is preferable to transport the paper based on the read second transport correction value.

According to the ink jet recording apparatus of the present invention configured as described above, the same effect as that of the fourth aspect is obtained.
Further, in the ink jet recording apparatus according to claim 9, the type of the paper stored in the paper feeding unit is determined by detecting the glossiness of the surface of the paper as described in claim 11. It may be.

That is, the ink jet recording apparatus according to claim 9 is provided with a glossiness detecting means (12) for detecting the glossiness of the surface of the paper.
The storage unit stores a first transport correction value and a second transport correction value corresponding to the glossiness of the surface of the paper.

  Then, the control means reads out the first conveyance correction value corresponding to the glossiness of the surface of the paper detected by the glossiness detection means from the storage means, and outputs a predetermined amount of paper based on the read first conveyance correction value. The conveyance unit is controlled to convey, and each time the predetermined amount is conveyed, the conveyance amount of the paper corresponding to the predetermined amount is calculated based on the paper conveyance position detected by the detection unit, and the calculated conveyance amount of the paper And the second conveyance corresponding to the glossiness of the surface of the paper detected by the glossiness detecting means when the calculated difference or the accumulated value of the difference exceeds the predetermined value. The correction unit may be read from the storage unit, and the conveyance unit may be controlled to convey the sheet based on the read second conveyance correction value.

According to the ink jet recording apparatus of the present invention configured as described above, the same effects as in the fifth aspect are obtained.
In the ink jet recording apparatus according to claim 9, the number of paper feed units that can accommodate a plurality of sheets is not limited to one, and as described in claim 12, the paper feed units can be adapted to a plurality of paper feed units. Good.

  That is, in the ink jet recording apparatus according to claim 9, a plurality of paper sheets that can accommodate a plurality of sheets and that have different identification information, and sheets that are accommodated corresponding to the plurality of paper feed sections, respectively. Separating means for separating and sending the sheets one by one, and paper feeding section information obtaining means (86) for obtaining one piece of identification information among the plurality of paper feeding sections.

The storage unit stores a first transport correction value and a second transport correction value corresponding to the identification information of the plurality of paper feeding units, respectively.
Then, the control unit reads the first conveyance correction value corresponding to the identification information acquired by the paper feed unit information acquisition unit from the storage unit, and conveys the sheet by a predetermined amount based on the read first conveyance correction value. Controlling the conveying means so as to calculate the paper conveyance amount corresponding to the predetermined amount based on the paper conveyance position detected by the detection means each time the predetermined amount is conveyed, and the calculated paper conveyance amount; The difference from the predetermined amount is calculated, and when the calculated difference or the accumulated value of the difference exceeds the predetermined value, the second conveyance correction value corresponding to the identification information acquired by the paper feed unit information acquisition unit is stored. The conveyance means may be controlled to convey the sheet based on the second conveyance correction value read from the means and read out.

According to the ink jet recording apparatus of the present invention configured as described above, the same effect as in the sixth aspect is obtained.
Further, in the ink jet recording apparatus according to claim 10, the number of paper feeding units capable of accommodating a plurality of sheets is not limited to one, and as described in claim 13, the paper feeding unit can be adapted to a plurality of paper feeding units. Good.

  That is, in the ink jet recording apparatus according to claim 10, a plurality of the sheets can be accommodated and a plurality of sheet feeding units having different identification information and sheets respectively accommodated corresponding to the plurality of sheet feeding units. Separating means for separating and sending the sheets one by one, and paper feeding section information obtaining means (86) for obtaining one piece of identification information among the plurality of paper feeding sections.

The storage unit stores a first transport correction value and a second transport correction value corresponding to the identification information of the plurality of paper feeding units and the types of paper, respectively.
The control unit reads out the first conveyance correction value corresponding to the identification information acquired by the paper feed unit information acquisition unit and the paper type acquired by the paper type acquisition unit from the storage unit, and reads the first read The conveyance unit is controlled to convey a predetermined amount of paper based on the conveyance correction value, and the conveyance amount of the paper corresponding to the predetermined amount is detected based on the paper conveyance position detected by the detection unit every time the predetermined amount is conveyed The difference between the calculated transport amount of the paper and the predetermined amount is calculated, and when the calculated difference or the accumulated value of the difference exceeds the predetermined value, it is acquired by the paper feed unit information acquisition unit. A second conveyance correction value corresponding to the identification information and the paper type acquired by the paper type acquisition unit is read from the storage unit, and the conveyance is performed so that the sheet is conveyed based on the read second conveyance correction value. It may control the unit.

According to the ink jet recording apparatus of the present invention configured as described above, the same effect as in the sixth aspect is obtained.
Further, in the ink jet recording apparatus according to claim 11, the number of paper feed units that can accommodate a plurality of sheets is not limited to one, and as described in claim 14, the paper feed units can be adapted to a plurality of paper feed units. Good.

  That is, in the ink jet recording apparatus according to claim 11, a plurality of the sheets can be accommodated, and a plurality of sheet feeding units having different identification information and sheets respectively accommodated corresponding to the plurality of sheet feeding units. Separating means for separating and sending the sheets one by one, and paper feeding section information obtaining means (86) for obtaining one piece of identification information among the plurality of paper feeding sections.

The storage unit stores a first conveyance correction value and a second conveyance correction value corresponding to the identification information of the plurality of paper feeding units and the glossiness of the surface of the paper, respectively.
Then, the control means reads out the first conveyance correction value corresponding to the identification information acquired by the paper feed unit information acquisition means and the glossiness of the surface of the paper detected by the glossiness detection means from the storage means, and reads it out. The conveyance means is controlled to convey a predetermined amount of paper based on the first conveyance correction value, and the conveyance of the paper detected by the detection means is detected for the conveyance amount of the paper corresponding to the predetermined amount every time the predetermined amount is conveyed. Calculate based on the position, calculate the difference between the calculated transport amount of the paper and the predetermined amount, and if the calculated difference or the accumulated value of the difference exceeds the predetermined value, the paper feed unit information acquisition means The second conveyance correction value corresponding to the acquired identification information and the glossiness of the surface of the paper detected by the glossiness detection means is read from the storage means, and the paper is carried based on the read second conveyance correction value. It may control the conveying means so as to.

  According to the ink jet recording apparatus of the present invention configured as described above, the same effect as in the sixth aspect is obtained.

Embodiments of the present invention will be described below with reference to the drawings.
[Description of Configuration of Multifunctional Device 1]
FIG. 1 is a perspective view of a multi-function device 1 to which an ink jet recording apparatus 3 of the present invention is applied, and FIG. 2 is a side sectional view thereof.

The multi-function device 1 of this embodiment includes a printer function, a copy function, a scanner function, and a facsimile function.
An image reading device 23 used for reading a document is disposed on the upper portion of the housing 2. The image reading device 23 is arranged such that its bottom wall 23a (see FIG. 2) is superimposed from above the upper cover body 25 with almost no gap, and is disposed on one side end of the housing 2 via a pivot portion (not shown). On the other hand, it can be opened and closed up and down. Further, the rear end of the document cover body 27 covering the upper surface of the image reading device 23 is attached to the rear end of the image reading device 23 so as to be rotatable up and down around the pivot 23b.

  In front of the image reading device 23, an operation panel unit 29 including various operation buttons, a liquid crystal display unit, and the like is provided. On the upper surface of the image reading device 23, there is provided a placement glass plate 31 on which the document cover body 27 can be opened and a document can be placed, and an image scanner device 33 for reading the document is provided on the lower side. It is provided so as to be able to reciprocate along a guide shaft 35 extending in the main scanning direction (Y-axis direction).

An ink jet recording apparatus 3 for forming an image is disposed in the housing 2 made of synthetic resin.
[Description of Configuration of Inkjet Recording Apparatus 3]
A paper feed cassette 4 that can be inserted from the opening 2 a is provided on the front side of the ink jet recording apparatus 3.

  The paper feed cassette 4 is configured to be capable of storing a plurality of sheets P cut into, for example, A4 size or legal size, and the short side of each sheet P is in the sheet transport direction (sub-scanning direction and X-axis direction). Are aligned in parallel to the direction orthogonal to the main scanning direction and the Y-axis direction.

  At the front end of the paper feed cassette 4, an auxiliary support member 4a for supporting the rear end of a long sheet P of legal size or the like is mounted so as to be movable in the X-axis direction. FIG. 2 shows an example in which the auxiliary support member 4a protrudes to the outside from the housing 2. However, when the paper P that can be stored in the A4 size paper feed cassette 4 is used, the auxiliary support member 4a is auxiliary supported by the storage portion 4b. The member 4a can be stored so as not to interfere with paper feeding.

  Further, a bank portion 5 for separating paper is disposed on the rear side of the paper feed cassette 4. The multi-function device 1 is configured such that a base end portion of a paper feed arm 9a that constitutes a paper feed unit 9 is attached to a bottom plate of a box-type main frame 7 made of a metal plate so as to be rotatable in the vertical direction. The paper P stacked on the paper feed cassette 4 is separated and conveyed one by one by the paper feed roller 9b provided at the lower end of the paper feed arm 9a and the bank portion 5. The separated paper P is transported to the image forming unit 13 provided above (higher position) than the paper feed cassette 4 via the U-turn path 11 constituting the U-shaped transport path.

  The image forming unit 13 includes a carriage 17 and the like that can reciprocate in the main scanning direction on which an ink jet recording head 15 is mounted. The carriage 17 is controlled by a CPU 60 to be described later, and the recording head 15 is moved in the main scanning direction. Scan. The recording head 15 ejects ink at the time of scanning, and forms an image on the paper P stopped and disposed under the recording head 15. At this time, the paper P is supported from below by the platen 19 constituting the transport path. That is, the recording head 15 is positioned immediately above the platen 19, and image formation on the paper P by the recording head 15 is performed on the platen 19.

  Note that an ink storage unit (not shown) that opens upward is provided at the front of the housing 2 that is covered by the image reading device 23. The ink storage unit is detachably mounted with ink cartridges each containing four colors (black, cyan, magenta, yellow) for full color recording. In the multi-function device 1 of this embodiment, the ink stored in the ink cartridge is supplied to the recording head 15 via a plurality of ink supply pipes 37 connecting the ink cartridges and the recording head 15.

  The paper discharge unit 21 for discharging the paper P on which the image is formed by the image forming unit 13 is formed on the upper side of the paper feed cassette 4, and the paper discharge port 21 a communicating with the paper discharge unit 21 is provided in the housing 2. Is opened in common with the opening 2a on the front surface of the.

Next, the paper transport mechanism 6 provided in the ink jet recording apparatus 3 will be described.
[Description of Configuration of Paper Conveying Mechanism 6]
FIG. 3 is an explanatory diagram showing a schematic configuration of the transport unit 40 and the control unit 50 constituting the paper transport mechanism 6 of the ink jet recording apparatus 3, and each part in the ink jet recording apparatus 3 described in FIGS. This is schematically shown from the point of view. Therefore, the same components as those described in FIGS.

  As shown in FIG. 3, the transport unit 40 of the inkjet recording apparatus 3 includes a paper feed cassette 4 and a paper feed unit 9 that separates and feeds the paper P stored in the paper feed cassette 4 one by one. A transport roller 41 for transporting the paper P sent out by the paper feed roller 9b of the paper feed section 9 to the lower side of the recording head 15, and a pinch roller 42 disposed opposite to the transport roller 41 while being in pressure contact with the transport roller 41. The paper discharge roller 43 that discharges the paper P after the image formation to the paper discharge unit 21 while assisting the paper conveyance during the image forming process, and the pinch roller that is disposed so as to be in pressure contact with the paper discharge roller 43 (Spur roller) 44, bank portion 5 and U-turn path 11 and platen 19 constituting the conveyance path of the paper P, paper conveyance motor 45 which is a driving source of the conveyance roller 41 and paper discharge roller 43, and paper conveyance motor 45 By And a belt BL1, BL2 for transmitting the generated force. The paper transport motor 45 is driven based on various commands (control signals) input from the control unit 50.

  The upstream portion of the conveyance path composed of the bank portion 5 and the U-turn path 11 regulates the movement of the paper P sent out by the paper feed roller 9 b and guides the paper P to the contact point between the conveyance roller 41 and the pinch roller 42. Therefore, on the downstream side in the transport direction of the paper P in the U-turn path 11, the downward movement of the paper P is restricted and the paper P is moved between the transport roller 41 and the pinch roller 42. An auxiliary portion 11a for guiding to the contact is provided.

  Therefore, the paper P delivered from the paper feed cassette 4 is guided to the contact point between the transport roller 41 and the pinch roller 42 by the bank portion 5, the U-turn path 11, and the auxiliary portion 11 a. In this state, when the transport roller 41 rotates forward in the transport direction (counterclockwise rotation in FIG. 3), the paper P is drawn between the transport roller 41 and the pinch roller 42 and is moved to the transport roller 41 and the pinch roller 42. It is pinched. Thereafter, the paper P is transported to the paper discharge roller 43 side, which is the transport direction, at a distance corresponding to the rotation amount of the transport roller 41 as the transport roller 41 rotates.

  On the other hand, the platen 19 constitutes a downstream portion of the conveyance path connecting the conveyance roller 41 and the discharge roller 43, and is provided between the conveyance roller 41 and the discharge roller 43 along a line connecting them. ing. The platen 19 guides the paper P sent from the transport roller 41 to a region where an image is formed by the recording head 15, and also feeds the paper P on which the image is formed by the recording head 15 to a paper discharge roller 43 and a pinch roller. Guide to contact with 44. In the following, an end point on the downstream side of the image forming region RG where image formation is performed with each color ink is expressed as an image forming point GP, and an upstream neighboring point of an upstream end point of the image forming region RG is referred to as a conveyance start point GS. Express.

  The paper P is conveyed along the platen 19 toward the paper discharge roller 43, and when the front end (downstream edge) of the paper P reaches the contact point between the paper discharge roller 43 and the pinch roller 44, the paper discharge roller 43. Is rotated between the paper discharge roller 43 and the pinch roller 44 and is sandwiched between the paper discharge roller 43 and the pinch roller 44. Thereafter, along with the rotation of the paper discharge roller 43, the paper is transported to the paper discharge unit 21 side which is a distance corresponding to the rotation amount of the paper discharge roller 43 (matching the rotation amount of the transport roller 41). The transport roller 41, the paper discharge roller 43, and the pinch rollers 42 and 44 are rotating bodies having rotational axes in a direction (main scanning direction) substantially intersecting (orthogonal) with the transport direction. The paper P receives a driving force from the contact with the transport roller 41 and the contact with the paper discharge roller 43 and is transported along the transport path in the transport direction (that is, from upstream to downstream of the transport path) as described above. .

  Further, the paper transport motor 45 is configured by a DC motor, and is driven by the control unit 50. The rotational force of the paper transport motor 45 is passed through the belt BL1 spanned between the paper transport motor 45 and the transport roller 41. This is transmitted to the conveyance roller 41. Thereby, the conveyance roller 41 rotates. Further, the rotational force transmitted to the transport roller 41 is transmitted to the paper discharge roller 43 via the belt BL2 spanned between the transport roller 41 and the paper discharge roller 43, whereby the paper discharge roller 43 is It rotates in the same direction as the transport roller 41. In addition, the rotational force generated from the paper transport motor 45 is transmitted to the paper feed roller 9b via a transmission mechanism (not shown), whereby the paper feed roller 9b rotates.

  However, the paper feed roller 9b rotates in the transport direction of the paper P only during the paper feed process and sends the paper P to the transport roller 41 side, and does not receive the rotational force from the paper transport motor 45 during the image forming process. Idle. In other words, the transmission mechanism connecting the paper feed roller 9b and the paper transport motor 45 transmits the rotational force to the paper feed roller 9b only during paper feed, and separates the built-in gear during the image forming process to the paper feed roller 9b. It is configured not to transmit rotational force.

  When the paper feed roller 9b rotates in the transport direction, the transport roller 41 and the paper discharge roller 43 rotate in the direction opposite to the transport direction. That is, the transmission mechanism that connects the paper feed roller 9b and the paper transport motor 45 does not transmit the rotational force to the paper feed roller 9b when the paper transport motor 45 rotates forward, and when the paper transport motor 45 rotates in the reverse direction, The rotational force is converted into a forward rotational force by a gear having a built-in rotational force and transmitted to the paper feed roller 9b.

  Here, the paper feed processing means that the paper feed roller 9b is rotated in a state where the paper feed roller 9b is pressed against the uppermost paper P among the papers P stacked on the paper feed cassette 4. The process of conveying the leading edge of the paper P to a registration position that is a contact point between the conveyance roller 41 and the pinch roller 42 is shown. The image forming process includes an initial conveying process for conveying the leading end of the drawing area on the paper P placed at the registration position to the image forming point GP, and an interval corresponding to the width of the image forming region RG in the conveying direction thereafter. Each time, the reference point of the paper P positioned at the transport start point GS is sequentially transported to the image forming point GP, and ink is ejected from the recording head 15 in conjunction with the transport of the paper P to form an image on the paper P. This process and the process which consists of are shown. However, the reference point of the paper P here indicates a point of the paper P located at the transport start point GS at the start of transport. The reference point of the paper P changes as the paper P is fed.

  As described above, the paper conveyance during the image forming process is realized by sequentially feeding the paper P by a predetermined amount in the sub-scanning direction (paper conveyance direction). Specifically, when recording for one pass is performed in the main scanning direction by the reciprocating recording head 15, the sheet P is transported in a predetermined amount (conveyance distance for one pass) in the sub-scanning direction in order to record the next pass. Ds, a distance corresponding to the width of the image forming region RG in the transport direction) is fed and stopped, and recording in the main scanning direction is performed by the recording head 15 in that pass. When this is completed, the paper P is again fed by a predetermined amount in the sub-scanning direction and then stopped in order to record the next pass, and recording in the main scanning direction is performed by the recording head 15. That is, a predetermined amount of paper feeding in the sub-scanning direction is sequentially repeated until the recording on the paper P is completed.

  The transport unit 40 is provided with a paper transport encoder 49 that outputs a pulse signal every time the transport roller 41 rotates by a predetermined amount. An output signal of the paper transport encoder 49 is input to the control unit 50. In this embodiment, the transport roller 41 and the paper discharge roller 43 are rotated by the paper transport motor 45, and the rotation of the paper transport motor 45 is also transmitted to the paper feed roller 9b. Therefore, in the inkjet recording apparatus 3, by detecting and counting the pulse signal from the paper transport encoder 49, the rotation amount of the paper transport motor 45, the transport roller 41, the paper discharge roller 43, and the paper feed roller 9b, It is possible to detect the movement distance (conveyance distance) of the sheet P conveyed by each roller 41, 43, 9b.

  The sheet bottom sensor 10 will be described in [Other Embodiments] (1), which will be described later, and the paper transport sensor 14 will be described in [Other Embodiments] (2), which will be described later. Will be described later in [Other Embodiments] (4).

[Description of conveyance correction]
Next, conveyance deviation and conveyance correction of the paper P in the paper conveyance mechanism 6 will be described.
When the conveyance resistance of the paper P differs depending on the conveyance section in which the paper P is conveyed, the conveyance deviation amount for each conveyance section is investigated in advance. And conveyance correction is good according to the amount of conveyance gap for every conveyance section.

  First, as illustrated in FIG. 5, the conveyance section (“a” to “c” in the drawing) in which the paper P is pressed by the paper feed roller 9 b and the paper P are not pressed by the paper feed roller 9 b. The conveyance deviation amount of the paper P in the conveyance section (“c” to “f” in the drawing) is examined in advance.

  Here, FIG. 5 is a diagram illustrating a result of measuring an amount of conveyance deviation, which is a difference between the theoretical conveyance amount and the actual conveyance amount at the position of the recording head 15 when A4 size paper is conveyed in the longitudinal direction. FIG. The horizontal axis in FIG. 5 indicates the transport distance of A4 size paper. That is, the horizontal axis corresponds to the distance from the front end in the longitudinal direction of the paper. The vertical axis indicates the conveyance deviation amount that is the difference between the theoretical conveyance amount and the actual conveyance amount. The measurement results are indicated by diamonds in FIG. For example, the amount of conveyance deviation at a position about 20 mm from the front end of the A4 size paper (indicated by “b” in the figure) is about 7 μm, but a position about 130 mm from the front end of the A4 size paper (“c” in the figure). The amount of conveyance deviation at () is about −60 μm. Note that the conveyance section from the leading edge of the A4 size sheet (indicated by “a” in the drawing) to “c” in the drawing is the conveyance section in which the paper P is pressed by the paper feed roller 9b. Here, the numerical value indicated by minus “−” on the vertical axis indicates that the actual transport amount is small relative to the theoretical transport amount. That is, the conveyance distance from the position “b” in the figure to the position “c” in the figure increases in the minus “−” direction almost in proportion to the conveyance distance. The conveyance distance is about −60 μm, which is the largest conveyance deviation amount at the position “c” in the figure. On the other hand, for example, the conveyance deviation amount at a position of about 280 mm from the front end of the A4 size sheet (indicated by “f” in the drawing) is about 20 μm. In addition, the conveyance section after "c" in the figure is a conveyance section where the paper P is not pressed by the paper feed roller 9b. Here, the numerical value indicated by plus “+” on the vertical axis indicates that the actual transport amount is large relative to the theoretical transport amount. That is, the conveyance distance from the position “c” in the figure to the position “f” in the figure increases in the plus “+” direction substantially in proportion to the conveyance distance.

  Accordingly, since the actual transport amount with respect to the theoretical transport amount is small with respect to the transport deviation amount from the position “b” in the figure to the position “c” in the figure, plus “+ The conveyance correction amount in the “direction” may be added. For example, the conveyance distance from the position “b” in the figure to the position “c” in the figure is about 130 mm−about 20 mm = about 110 mm, and the conveyance deviation amount is about −60 μm− (about −5 μm). = About -55 μm. Therefore, it is preferable to add a conveyance correction amount in the plus “+” direction of about 55 μm with respect to about a conveyance distance of about 110 mm. On the other hand, since the actual conveyance amount with respect to the theoretical conveyance amount is large with respect to the conveyance deviation amount from the position “c” in the drawing to the position “f” in the drawing, the minus “−” The conveyance correction amount in the “direction” may be added. For example, the conveyance distance from the position “c” in the figure to the position “f” in the figure is about 280 mm−about 130 mm = about 150 mm, and the conveyance deviation amount is about 20 μm− (about −60 μm) = About 80 μm. Therefore, a conveyance correction amount in the minus “−” direction of about −80 μm with respect to about the conveyance distance of about 150 mm may be added.

[Description of electrical configuration]
Here, the electrical configuration of the inkjet recording apparatus 3 will be described with reference to the block diagram of FIG. As shown in FIG. 4, the control unit 50 of the inkjet recording apparatus 3 includes a CPU 60, a ROM 62, a RAM 64, an EEPROM 66, and an ASIC 70. The CPU 60, ROM 62, RAM 64, EEPROM 66 and ASIC 70 are connected by a bus 68. The CPU 60 performs overall control of the inkjet recording apparatus 3.

  Further, the control unit 50 includes a head driving unit 80 for driving the recording head 15 (ink ejection) and a motor driving unit 82 for driving the carriage motor 16 and the paper transport motor 45. The head driving unit 80 and the motor driving unit 82 are connected to the ASIC 70 and control driving of the recording head 15 (ink ejection), driving of the carriage motor 16 and the paper transport motor 45. The carriage 17 is driven in the main scanning direction by the rotation of the carriage motor 16.

  Furthermore, the control unit 50 includes a panel interface unit 84 that processes a signal from the operation panel unit 29 and a USB interface unit 86 that is communicably connected to the computer 100.

  The ASIC 70 included in the control unit 50 is electrically connected to the carriage encoder 18 that detects the main scanning amount (position) of the carriage 17 and the paper conveyance encoder 49 that detects the conveyance amount (position) of the paper P. Signals from the carriage encoder 18 and the paper transport encoder 49 are input to the ASIC 70.

  The sheet bottom sensor 10 will be described in [Other Embodiments] (1), which will be described later, and the paper transport sensor 14 will be described in [Other Embodiments] (2), which will be described later. Will be described later in [Other Embodiments] (4).

Among them, the ROM 62 is provided with a memory area 90 for correction value data and a memory area 92 for paper size data, as illustrated in FIG. Hereinafter, it demonstrates in order.
(A) Correction Value Data Correction value data includes data indicating two conveyance sections in which the paper P is conveyed and examples of these two conveyance sections, as illustrated in FIGS. 6B and 6C. Data that is associated with data indicating the corresponding conveyance correction value.

  As illustrated in FIGS. 6B and 6C, the correction value data is associated with the numerical value “1” of the conveyance section (1) and the conveyance correction value (A). It is stored in the memory area 90 (1). Further, the numerical value “2” of the conveyance section (2) and the conveyance correction value (B) are associated with each other and stored in the memory area 90 (2) of the correction value data.

(B) Paper Size Data The paper size data is data indicating the paper size and data indicating the length dimension of the paper P corresponding to the paper size, as illustrated in FIGS. 6D and 6E. Refers to the data associated with.

  Here, the length dimension of the paper P corresponding to the paper size is, for example, 297 mm when the longitudinal direction of the A4 size paper is the transport direction, and the longitudinal direction of the A3 size paper is the transport direction. In this case, it is 420 mm.

  Then, as illustrated in FIGS. 6D and 6E, the paper size data is associated with the value “1” of the paper size (1) and the length dimension (a). It is stored in the memory area 92 (1). Also, the numerical value “2” of the paper size (2) and the length dimension (b) are associated with each other and stored in the memory area 92 (2) of the correction value data.

  In the present embodiment, the paper feed roller 9b corresponds to a “separation unit”, and the conveyance roller 41 and the pinch roller 42 correspond to a “conveyance unit”. The control unit 50 corresponds to “determination unit” and “control unit”, the ROM 62 corresponds to “storage unit” and “paper size storage unit”, and the USB interface unit 86 corresponds to “acquisition unit”.

[Description of paper printing process (1)]
The procedure of “paper printing process (1)” executed by the CPU 60 included in the control unit 50 will be described below with reference to the flowcharts of FIGS.

  The paper size data received by the computer 100 is transmitted from the computer 100 to the control unit 50, but the CPU 60 determines whether or not the paper size data has been acquired from the computer 100 via the USB interface unit 86. (S110). When the paper size data transmitted from the computer 100 is acquired (S110: YES), the length dimension data of the paper P corresponding to the acquired paper size is read (S112). Specifically, the data indicating the paper size and the data indicating the length dimension of the paper P corresponding to the paper size are associated with each other and stored in the memory area 92 of the paper size data provided in the ROM 62. The CPU 60 reads the length dimension data of the paper P corresponding to the acquired paper size from the paper size data. Then, when the process of S112 is completed, the process of S114 is performed. In the process of S110 described above, the paper size data is received by the computer 100, but the present invention is not limited to this. The paper size data received by the operation panel unit 29 may be transmitted to the CPU 60 by the panel interface unit 84.

  In the process of S114, the CPU 60 calculates the first transport section and the second transport section from the read length dimension of the paper P. Specifically, the distance of the first transport section is calculated by subtracting the distance of the second transport section from the length dimension of the paper P. For example, the second transport section is a transport distance from the position away from the state where the paper P is pressed by the paper feed roller 9b to the image forming point GP in the transport direction. Then, this 2nd conveyance area is corresponded in the conveyance area of the state which is not press-contacted by the paper feed roller 9b. Therefore, this second transport section is a fixed transport section regardless of the length dimension of the paper P. Therefore, the first transport section can be calculated by subtracting the distance of the second transport section from the length dimension of the paper P. Accordingly, the first transport section changes according to the length dimension of the paper P. When viewed from the paper P, the first transport section is the first half of the transport direction of the paper P, and the second transport section is the second half of the transport direction of the paper P. Then, when the process of S114 is completed, the process of S116 is performed.

  In the process of S116, the paper P is fed. Specifically, the CPU 60 controls the ASIC 70 to feed the paper P. Then, the ASIC 70 controls the motor driving unit 82 so that the sheet feeding roller 9b is stacked and mounted on the sheet feeding cassette 4 as in the sheet feeding process described in [Description of the configuration of the sheet conveying mechanism 6]. The sheet feeding roller 9b is rotated in a state where it is pressed against the uppermost sheet P of the sheets P, and the leading end of the sheet P is conveyed to a registration position that is a contact point between the conveying roller 41 and the pinch roller 42. Then, the paper P is initially conveyed (S118). Specifically, the CPU 60 controls the ASIC 70 to cause the paper P to be initially conveyed. Then, the ASIC 70 controls the motor driving unit 82 to draw the drawing area on the paper P arranged at the registration position as in the initial transport processing of the image forming processing in [Description of the configuration of the paper transport mechanism 6] described above. Is conveyed to the image forming point GP. Next, main scanning printing is executed (S120). Specifically, the CPU 60 controls the ASIC 70 to execute main scanning printing. Then, the ASIC 70 controls the head driving unit 80 to eject ink from the recording head 15 as in the image formation in the main process of the image forming process described in [Description of the configuration of the paper transport mechanism 6], and Let P form an image. Then, when the process of S120 is completed, the process of S122 is performed.

  In the process of S122, it is determined whether or not the carry amount of the paper P is acquired from the computer 100. Specifically, the CPU 60 determines whether the transport amount of the paper P is acquired from the computer 100 via the USB interface unit 86. Here, the transport amount of the paper P is, for example, the width in the transport direction of the image forming region RG as in the transport of the paper P in the main process of the image forming process described in [Description of the configuration of the paper transport mechanism 6]. For each corresponding interval, it refers to the transport amount for sequentially transporting the reference point of the paper P located at the transport start point GS to the image forming point GP. When the transport amount of the paper P transmitted from the computer 100 is acquired (S122: YES), the paper transport position is calculated (S124 shown in FIG. 8). Specifically, the CPU 60 calculates the paper transport position by adding the transport amount of the paper P acquired in the process of S122 after the paper P is initially transported in the process of S118. For example, when the transport amount of the paper P is a predetermined amount (the transport distance Ds for one pass), such as the transport of the paper P in the main process of the image forming process described above [Description of the configuration of the paper transport mechanism 6]. In the process of S118, when the transport amount of the first paper P is acquired after the paper P is initially transported, the paper transport position is Ds × 1 = Ds. When the transport amount of the second paper P is acquired, the paper transport position is Ds × 2 = 2Ds. Further, when the transport amount of the nth paper P is acquired, the paper transport position is Ds × n = n × Ds. Then, when the process of S124 is completed, the process of S126 is performed.

  In the process of S126, it is determined whether or not the paper transport position is the first transport section. Specifically, the CPU 60 determines whether or not the paper transport position calculated in the process of S124 is the first transport section calculated in the process of S114. If the paper transport position is the first transport section (S126: YES), the first transport correction value is set (S128). Specifically, the data indicating the two transport sections and the data indicating the transport correction values corresponding to the two transport sections are associated with each other and stored in the memory area 90 of the correction value data provided in the ROM 62. The CPU 60 reads out the first conveyance correction value corresponding to the first conveyance section from the correction value data. Then, the CPU 60 controls the ASIC 70 to store the read first conveyance correction value in a ROM (not shown) that stores the conveyance correction value of the ASIC 70. On the other hand, when the paper transport position is not the first transport section (S126: NO), the second transport correction value is set (S130). Specifically, the data indicating the two transport sections and the data indicating the transport correction values corresponding to the two transport sections are associated with each other and stored in the memory area 90 of the correction value data provided in the ROM 62. The CPU 60 reads out the second transport correction value corresponding to the second transport section from the correction value data being stored. Then, the CPU 60 controls the ASIC 70 to store the read second conveyance correction value in a ROM (not shown) that stores the conveyance correction value of the ASIC 70. Then, when the process of S128 or the process of S130 is completed, the process of S132 is performed.

  In the process of S132, the paper P is transported with the transport correction value set in the process of S128 or S130. Specifically, the CPU 60 controls the ASIC 70 to transport the paper P by the transport amount of the paper P acquired in the process of S122. Then, the ASIC 70 controls the motor driving unit 82 to read the conveyance correction value set in the process of S128 or S130 from the ROM included in the ASIC 70, and to read the paper P based on the read conveyance correction value in S122. In this process, the paper P is transported by the transport amount obtained. Then, when the process of S132 is completed, the process of S134 is performed.

In the process of S134, it is determined whether or not the paper printing is finished. If the paper printing is not completed (S134: NO), the process returns to S120 (see FIG. 7) and the above-described processing is performed.
On the other hand, when the paper printing is completed (S134: YES), the paper P is discharged (S136). Specifically, the CPU 60 controls the ASIC 70 to discharge the paper P. Then, the ASIC 70 controls the motor driving unit 82 to rotate the transport roller 41 and the paper discharge roller 43 to discharge the paper P to the paper discharge unit 21.

When the process of S136 is completed, the “paper printing process (1)” is completed.
[effect]
In the conventional ink jet recording apparatus, there is a problem in that the amount of paper conveyance deviation changes between when the paper is pressed by the paper feed roller and when the paper is not pressed by the paper feed roller, and printing unevenness occurs. there were.

  On the other hand, according to the inkjet recording apparatus 3 of the first embodiment, the conveyance deviation amount when the paper P is pressed by the paper feed roller 9b and the conveyance deviation amount when the paper P is not pressed by the paper feed roller 9b. Are stored in advance in a memory area 90 of correction value data provided in the ROM 62, and a conveyance correction value obtained by adding a conveyance correction amount in accordance with the conveyance deviation amount in each case is stored. Further, for the paper P having different length dimensions in the transport direction of the paper P, the CPU 70 calculates the transport position of the transported paper P and determines whether the paper P is pressed by the paper feed roller 9b. The conveyance correction value in each case is read out from the memory area 90 of correction value data provided in the ROM 62. Then, the ASIC 70 transports the paper P based on the transport correction value in each case read by controlling the motor driving unit 82.

  Therefore, even for sheets having different length dimensions in the sheet conveyance direction, the change in the sheet conveyance deviation amount between the case where the sheet is pressed by the sheet feed roller and the case where the sheet is not pressed by the sheet feed roller is reduced. And printing unevenness can be prevented.

[Other embodiments]
As mentioned above, although embodiment of this invention was described, this invention is not limited to the said embodiment, It is possible to implement in the following various aspects.

  (1) In the above-described embodiment, the first conveyance section corresponding to the conveyance section in a state where the paper P is pressed by the paper feed roller 9b due to the length dimension of the paper P and the paper P are pressed by the paper feed roller 9b. Although the CPU 60 has calculated the second conveyance section corresponding to the conveyance section in a state where it is not, the present invention is not limited to this. The paper lower end sensor 10 may detect when the paper P is pressed by the paper feed roller 9b and when the paper P is not pressed by the paper feed roller 9b. Specifically, as illustrated by a broken line in FIG. 3, for example, the sheet lower end sensor 10 is provided at a position where the sheet P can be detected in the direction of a tangent line where the sheet feeding roller 9 b and the sheet P are pressed against each other. Yes. And this paper lower end sensor 10 is electrically connected with ASIC70 with which the control part 50 is provided so that it may illustrate with the broken line in FIG. A signal from the sheet bottom sensor 10 is input to the ASIC 70. The paper lower end sensor 10 is, for example, a laser displacement sensor, and detects a step in the thickness of the paper P at the rear end portion of the paper P. For example, since the thickness of plain paper is about 90 μm, a step difference in thickness of the paper P can be detected by a laser displacement sensor having a resolution of about 10 μm.

In the present embodiment, the sheet lower end sensor 10 corresponds to “rear end detecting means”.
The procedure of “paper printing process (2)” executed by the CPU 60 included in the control unit 50 will be described below with reference to the flowcharts of FIGS. 9 and 10.

[Description of paper printing process (2)]
First, the paper P is fed (S210). Specifically, the leading edge of the paper P is transported to a registration position that is a contact point between the transport roller 41 and the pinch roller 42 as in the above embodiment. Then, the paper P is initially conveyed (S212). Specifically, the leading end of the drawing area on the paper P placed at the registration position as in the above embodiment is conveyed to the image forming point GP. Next, main scanning printing is executed (S214). Specifically, ink is ejected from the recording head 15 to form an image on the paper P as in the above embodiment. Then, when the process of S214 is completed, the process of S216 is performed.

  In the process of S216, it is determined whether the transport amount of the paper P is acquired from the computer 100. Specifically, as in the above embodiment, the CPU 60 determines whether the transport amount of the paper P has been acquired from the computer 100 via the USB interface unit 86. Here, as in the above-described embodiment, the transport amount of the paper P is, for example, image formation of the reference points of the paper P positioned at the transport start point GS sequentially at intervals corresponding to the width of the image forming region RG in the transport direction. It refers to the transport amount transported to the point GP. When the transport amount of the paper P transmitted from the computer 100 is acquired (S216: YES), it is determined whether or not the paper lower end sensor 10 detects the lower end of the paper P (S218 shown in FIG. 10). Specifically, as described above, the paper lower end sensor 10 detects a step in the thickness of the paper P at the rear end portion of the paper P. If the sheet lower end sensor 10 has not detected the lower end of the sheet P (S218: NO), the first conveyance correction value is set (S220). Specifically, the CPU 60 reads the first transport correction value corresponding to the first transport section as in the above embodiment. Then, the CPU 60 controls the ASIC 70 to store the read first conveyance correction value in a ROM (not shown) that stores the conveyance correction value of the ASIC 70. On the other hand, when the sheet lower end sensor 10 detects the lower end of the sheet P (S218: YES), a second conveyance correction value is set (S222). Specifically, the CPU 60 reads out the second transport correction value corresponding to the second transport section as in the above embodiment. Then, the CPU 60 controls the ASIC 70 to store the read second conveyance correction value in a ROM (not shown) that stores the conveyance correction value of the ASIC 70. Then, when the process of S220 or the process of S222 is completed, the process of S224 is performed.

  In the process of S224, the paper P is transported with the transport correction value set in the process of S220 or S222. Specifically, the CPU 60 controls the ASIC 70 to transport the paper P by the transport amount of the paper P acquired in the process of S216. Then, the ASIC 70 controls the motor driving unit 82 to read the conveyance correction value set in the processing of S220 or S222 as in the above embodiment from the ROM included in the ASIC 70, and to the read conveyance correction value. Based on this, the paper P is transported by the transport amount of the paper P acquired in the process of S216. Then, when the process of S224 is completed, the process of S226 is performed.

In the process of S226, it is determined whether or not the paper printing is finished. If the paper printing is not completed (S226: NO), the process returns to S214 (see FIG. 9) and the above-described processing is performed.
On the other hand, when the paper printing is completed (S226: YES), the paper P is discharged (S228). Specifically, the CPU 60 controls the ASIC 70 to discharge the paper P. Then, the ASIC 70 controls the motor driving unit 82 to rotate the transport roller 41 and the paper discharge roller 43 to discharge the paper P to the paper discharge unit 21.

When the process of S228 is completed, the “paper printing process (2)” is completed.
[effect]
As described above, the paper lower end sensor 10 detects the case where the paper P is pressed by the paper feed roller 9b and the case where the paper P is not pressed by the paper feed roller 9b.

  Then, by executing the above-described paper printing process (2), the paper is pressed by the paper feed roller with respect to papers having different length dimensions in the paper transport direction without receiving paper size data. Thus, the change in the amount of paper conveyance deviation caused by the case where the sheet is not pressed by the paper feed roller can be reduced, and the occurrence of uneven printing can be prevented.

  (2) In the above embodiment, the sheet P is pressed against the first transport section corresponding to the transport section in the state where the sheet P is pressed by the paper feed roller 9b due to the length dimension of the paper P by the paper feed roller 9b. Although the CPU 60 has calculated the second conveyance section corresponding to the conveyance section in a state where it is not, the present invention is not limited to this. When the paper P is pressed by the paper feed roller 9b and when the paper P is not pressed by the paper feed roller 9b, the change point of the transport deviation of the transported paper P is detected, and the detected transport You may determine based on the conveyance position of the change point of deviation | shift. Specifically, as exemplified by a broken line in FIG. 3, the paper transport sensor 14 is provided, for example, between the paper feed roller 9b and the transport roller 41, and a roller (not shown) and each time this roller rotates by a predetermined amount. And a rotary encoder that outputs a pulse signal. The roller (not shown) rotates in contact with the paper P and directly detects the transport amount of the paper P. Instead of such a rotary encoder, for example, an image sensor may recognize the surface pattern of the paper P and detect the movement of the recognized surface pattern to detect the transport amount of the paper. The paper transport sensor 14 is electrically connected to an ASIC 70 provided in the control unit 50, as illustrated by a broken line in FIG. Then, a signal from the paper transport sensor 14 is input to the ASIC 70.

In the present embodiment, the paper transport sensor 14 corresponds to “detecting means”.
The procedure of “paper printing process (3)” executed by the CPU 60 included in the control unit 50 will be described below with reference to the flowcharts of FIGS. 11 and 12.

[Description of paper printing process (3)]
First, the first conveyance correction value mode is set (S310). Specifically, the data indicating the two conveyance correction value modes and the data indicating the conveyance correction values corresponding to the two conveyance correction value modes are associated with each other, and the memory of the correction value mode data provided in the ROM 62 is stored. The CPU 60 reads out the first transport correction value corresponding to the first transport correction value mode from the correction value mode data stored in the area (not shown). Then, the CPU 60 controls the ASIC 70 to store the read first conveyance correction value in a ROM (not shown) that stores the conveyance correction value of the ASIC 70.

  Then, the paper P is fed (S312). Specifically, the leading edge of the paper P is transported to a registration position that is a contact point between the transport roller 41 and the pinch roller 42 as in the above embodiment. Then, the paper P is initially conveyed (S314). Specifically, the leading end of the drawing area on the paper P placed at the registration position as in the above embodiment is conveyed to the image forming point GP. Next, main scanning printing is executed (S316). Specifically, ink is ejected from the recording head 15 to form an image on the paper P as in the above embodiment. Then, when the process of S316 is completed, the process of S318 is performed.

  In the process of S318, it is determined whether or not the carry amount of the paper P is acquired from the computer 100. Specifically, as in the above embodiment, the CPU 60 determines whether the transport amount of the paper P has been acquired from the computer 100 via the USB interface unit 86. Here, as in the above-described embodiment, the transport amount of the paper P is, for example, image formation of the reference points of the paper P positioned at the transport start point GS sequentially at intervals corresponding to the width of the image forming region RG in the transport direction. It refers to the transport amount transported to the point GP. When the transport amount of the paper P transmitted from the computer 100 is acquired (S318: YES), it is determined whether or not the transport correction value mode is the first transport correction value mode (S320 shown in FIG. 12). Specifically, the CPU 60 controls the ASIC 70 to read a conveyance correction value stored in a ROM (not shown) included in the ASIC 70. Then, the CPU 60 reads the conveyance correction value mode corresponding to the read conveyance correction value from the correction value mode data stored in the memory area (not shown) of the correction value mode data provided in the ROM 62. Then, it is determined whether or not the read conveyance correction value mode is the first conveyance correction value mode. When the conveyance correction value mode is the first conveyance correction value mode (S320: YES), the first conveyance correction value is set. Specifically, as described above, the CPU 60 controls the ASIC 70 to store the read first transport correction value in a ROM (not shown) that stores the transport correction value of the ASIC 70. On the other hand, when the conveyance correction value mode is not the first conveyance correction value mode (S322: NO), the second conveyance correction value is set. Specifically, the data indicating the two conveyance correction value modes and the data indicating the conveyance correction values corresponding to the two conveyance correction value modes are associated with each other, and the memory area of the correction value data provided in the ROM 62 The CPU 60 reads out the second conveyance correction value corresponding to the second conveyance correction value mode from the correction value data stored in (not shown). Then, the CPU 60 controls the ASIC 70 to store the read second conveyance correction value in a ROM (not shown) that stores the conveyance correction value of the ASIC 70. Then, when the process of S322 or the process of S324 is completed, the process of S326 is performed.

  In the process of S326, the paper P is transported with the transport correction value set in the process of S322 or the process of S324. Specifically, the CPU 60 controls the ASIC 70 to transport the paper P by the transport amount of the paper P acquired in the process of S122. Then, the ASIC 70 controls the motor driving unit 82 to read the conveyance correction value set in the process of S322 or S324 as described above from the ROM included in the ASIC 70, and to the read conveyance correction value. Based on this, the paper P is transported by the transport amount of the paper P acquired in the process of S318. Then, when the process of S326 is completed, the process of S328 is performed.

  In step S328, the actual transport amount of the paper P is detected. Specifically, the sheet conveyance sensor 14 directly detects the actual conveyance amount of the sheet P after the sheet P is initially conveyed in the process of S314 as described above.

  Then, it is determined whether or not the “numerical value” of the quantity obtained by subtracting the predetermined amount from the actual transport amount exceeds a predetermined value (S330). Specifically, the CPU 60 calculates a transport amount obtained by adding the transport amount of the paper P acquired in the processing of S318 after the initial transport of the paper P in the processing of S314 from the actual transport amount of the paper P detected in the processing of S328. Subtract. Then, it is determined whether or not the “numerical value” of the subtracted quantity exceeds a predetermined value. The predetermined value is, for example, a conveyance deviation at a predetermined conveyance amount in a conveyance section where the paper P is pressed by the paper feed roller 9b, and a conveyance section where the paper P is not pressed by the paper supply roller 9b. It is good to set it as about 50% of the difference with the conveyance deviation in the predetermined conveyance amount. In this way, it is possible to stably detect the change point of the conveyance deviation of the conveyed paper with respect to the variation in the mechanical conveyance amount for each apparatus of the inkjet recording apparatus. When the “numerical value” obtained by subtracting the predetermined amount from the actual conveyance amount exceeds the predetermined value (S330: YES), the second conveyance correction value mode is set. Specifically, the data indicating the two conveyance correction value modes and the data indicating the conveyance correction values corresponding to the two conveyance correction value modes are associated with each other, and the memory area of the correction value data provided in the ROM 62 The CPU 60 reads out the second conveyance correction value corresponding to the second conveyance correction value mode from the correction value data stored in (not shown). Then, the CPU 60 controls the ASIC 70 to store the read second conveyance correction value in a ROM (not shown) that stores the conveyance correction value of the ASIC 70. Then, when the process of S332 is completed, the process of S334 is performed. On the other hand, when the “numerical value” obtained by subtracting the predetermined amount from the actual transport amount does not exceed the predetermined value (S330: NO), the process of S334 is performed.

In the process of S334, it is determined whether or not the paper printing is finished. If the paper printing is not completed (S334: NO), the process returns to S316 (see FIG. 11) and the above-described processing is performed.
On the other hand, when the paper printing is completed (S334: YES), the paper P is discharged (S336). Specifically, the CPU 60 controls the ASIC 70 to discharge the paper P. Then, the ASIC 70 controls the motor driving unit 82 to rotate the transport roller 41 and the paper discharge roller 43 to discharge the paper P to the paper discharge unit 21.

Then, when the process of S336 is completed, the “paper printing process (3)” is completed.
[effect]
In this way, the change point of the conveyance deviation of the conveyed paper P is detected, and it is determined whether or not the paper P is in the first conveyance section based on the conveyance position of the detected change point of the conveyance deviation.

  Then, by executing the above-described paper printing process (3), the paper is pressed by the paper feed roller with respect to papers having different length dimensions in the paper transport direction without receiving paper size data. Thus, the change in the amount of paper conveyance deviation caused by the case where the sheet is not pressed by the paper feed roller can be reduced, and the occurrence of uneven printing can be prevented.

  (3) In the above embodiment, the conveyance correction value is provided in accordance with the conveyance section, but is not limited to the conveyance section. The type of paper, for example plain paper and glossy paper, have different friction coefficients and different paper thicknesses, so that the conveyance correction value may be further set depending on the type of paper. Specifically, as illustrated in FIG. 13A, memory areas 94 a and 94 b for paper type data are provided in the ROM 62. This paper type data will be described below.

(C) Paper type data The paper type data includes, as illustrated in FIG. 13B and FIG. 13C, data indicating the type of the paper P and two transport sections in which the paper P is transported, It refers to data associated with data indicating the conveyance correction values corresponding to these two conveyance sections.

  The paper type data includes the paper type (a), the numerical value “1” of the conveyance section (1), and the conveyance correction value (A) as illustrated in FIGS. 13B and 13C. The sheet conveyance data is associated and stored in the memory area 94a (1). Further, the sheet type (a), the numerical value “2” of the conveyance section (2), and the conveyance correction value (B) are associated and stored in the memory area 94a (2) of the sheet conveyance data. The paper type (b) is also stored in the memory areas 94b (1) and 94b (2) of the paper transport data.

In the present embodiment, the USB interface unit 86 corresponds to “paper type acquisition unit”.
Hereinafter, the procedure of “paper printing process (4)” executed by the CPU 60 included in the control unit 50 will be described with reference to the flowcharts of FIGS. 14 and 15.

[Description of paper printing process (4)]
First, the paper type size data received by the computer 100 is transmitted from the computer 100 to the control unit 50. The CPU 60 determines whether or not the paper type data has been acquired from the computer 100 via the USB interface unit 86. Is determined (S410). When the paper type data transmitted from the computer 100 is acquired (S410: YES), the first transport correction value and the second transport correction value corresponding to the acquired paper type are read (S412). Specifically, the type of the paper P, the data indicating the two transport sections in which the paper P is transported, and the data indicating the transport correction value corresponding to the two transport sections are associated with each other and provided in the ROM 62. The CPU 60 reads the first transport correction value and the second transport correction value corresponding to the acquired paper type from the paper type data stored in the memory areas 94a and 94b of the paper type data being stored. Then, when the process of S412 is completed, the process of S414 is performed. In the above-described processing of S410, the paper type data is received by the computer 100, but the present invention is not limited to this. The paper type data received by the operation panel unit 29 may be transmitted to the CPU 60 by the panel interface unit 84.

  In the process of S414, the paper P is fed. Specifically, the leading edge of the paper P is transported to a registration position that is a contact point between the transport roller 41 and the pinch roller 42 as in the above embodiment. Then, the paper P is initially conveyed (S416). Specifically, the leading end of the drawing area on the paper P placed at the registration position as in the above embodiment is conveyed to the image forming point GP. Next, main scanning printing is executed (S418). Specifically, ink is ejected from the recording head 15 to form an image on the paper P as in the above embodiment. Then, when the process of S418 is completed, the process of S420 is performed.

  In the process of S420, it is determined whether the transport amount of the paper P is acquired from the computer 100. Specifically, as in the above embodiment, the CPU 60 determines whether the transport amount of the paper P has been acquired from the computer 100 via the USB interface unit 86. Here, as in the above-described embodiment, the transport amount of the paper P is, for example, image formation of the reference points of the paper P positioned at the transport start point GS sequentially at intervals corresponding to the width of the image forming region RG in the transport direction. It refers to the transport amount transported to the point GP. When the transport amount of the paper P transmitted from the computer 100 is acquired (S420: YES), the paper transport position is calculated (S422 shown in FIG. 15). Specifically, the CPU 60 calculates the paper transport position by adding the transport amount of the paper P acquired in the process of S420 after the paper P is initially transported in the process of S416 as in the above embodiment. Then, when the process of S422 is completed, the process of S424 is performed.

  In the process of S424, it is determined whether or not the paper transport position is the first transport section. Specifically, the CPU 60 determines whether or not the paper transport position calculated in the process of S422 is the first transport section read in the process of S412. If the paper transport position is the first transport section (S424: YES), the first transport correction value is set (S426). Specifically, the type of the paper P, the data indicating the two transport sections in which the paper P is transported, and the data indicating the transport correction value corresponding to the two transport sections are associated with each other and provided in the ROM 62. The CPU 60 reads out the first sheet correction value corresponding to the acquired sheet type and the first conveyance section from the sheet type data stored in the memory areas 94a and 94b of the sheet type data being stored. Then, the CPU 60 controls the ASIC 70 to store the read first conveyance correction value in a ROM (not shown) that stores the conveyance correction value of the ASIC 70. On the other hand, when the paper transport position is not the first transport section (S424: NO), the second transport correction value is set (S428). Specifically, the type of the paper P, the data indicating the two transport sections in which the paper P is transported, and the data indicating the transport correction value corresponding to the two transport sections are associated with each other and provided in the ROM 62. The CPU 60 reads out the second sheet correction value corresponding to the acquired sheet type and the second conveyance section from the sheet type data stored in the memory areas 94a and 94b of the sheet type data being stored. Then, the CPU 60 controls the ASIC 70 to store the read second conveyance correction value in a ROM (not shown) that stores the conveyance correction value of the ASIC 70. When the process of S426 or S428 is completed, the process of S430 is performed.

  In the process of S430, the paper P is transported with the transport correction value set in the process of S426 or the process of S428. Specifically, the CPU 60 controls the ASIC 70 to transport the paper P by the transport amount of the paper P acquired in the process of S420. Then, the ASIC 70 controls the motor driving unit 82 to read the conveyance correction value set in the process of S426 or S428 from the ROM included in the ASIC 70, and the sheet P is read based on the read conveyance correction value in S420. In this process, the paper P is transported by the transport amount obtained. Then, when the process of S430 is completed, the process of S432 is performed.

  In the process of S432, it is determined whether or not the paper printing is completed. If the paper printing is not completed (S432: NO), the process returns to S418 (see FIG. 14) and the above-described processing is performed. On the other hand, when the paper printing is completed (S432: YES), the paper P is discharged (S434). Specifically, the CPU 60 controls the ASIC 70 to discharge the paper P. Then, the ASIC 70 controls the motor driving unit 82 to rotate the transport roller 41 and the paper discharge roller 43 to discharge the paper P to the paper discharge unit 21.

Then, when the process of S434 is completed, the “paper printing process (4)” is completed.
[effect]
As described above, the paper type data in which the type of the paper P, the data indicating the two transport sections in which the paper P is transported, and the data indicating the transport correction value corresponding to the two transport sections is associated is provided. ing.

  Then, by executing the above-described paper printing process (4), even when the paper has a different friction coefficient between the paper and the paper having a different thickness, the paper is pressed by the paper feed roller, It is possible to reduce the change in the amount of paper conveyance deviation due to the case where the sheet is not pressed by the paper feed roller, and to prevent the occurrence of uneven printing.

  (4) In the above embodiment (3), the paper type data is received by the computer 100 or the operation panel unit 29, but the present invention is not limited to this. The paper type, for example, plain paper and glossy paper, may be determined by directly detecting the glossiness of the surface of the paper by the glossiness sensor 12. Specifically, the glossiness sensor 12 is provided, for example, between the paper feed roller 9b and the transport roller 41 as illustrated by a broken line in FIG. And this glossiness sensor 12 is electrically connected with ASIC70 with which the control part 50 is provided so that it may illustrate with the broken line in FIG. A signal from the glossiness sensor 12 is input to the ASIC 70. Further, the glossiness sensor 12 is a visible light red LED glossiness discrimination sensor, for example, and detects how much light irradiated to the paper P at a certain angle bounces back to the same diagonal. .

As illustrated in FIG. 16A, memory areas 96 a and 96 b for glossiness data are provided in the ROM 62. The gloss data will be described below.
(D) Glossiness data The glossiness data includes data indicating the glossiness of the paper P and two transport sections in which the paper P is transported, as illustrated in FIGS. 16B and 16C. The data which show and the data which show the conveyance correction value corresponding to these two conveyance sections are linked | related.

  As illustrated in FIGS. 16B and 16C, the glossiness data includes the glossiness (a) of the paper, the numerical value “1” of the transport section (1), and the transport correction value (A). Are stored in the memory area 96a (1) of glossiness data. Further, the glossiness (a) of the sheet, the numerical value “2” of the conveyance section (2), and the conveyance correction value (B) are associated and stored in the memory area 96a (2) of the sheet conveyance data. The glossiness (b) of the paper is also stored in the memory areas 96b (1) and 96b (2) of glossiness data, respectively.

In the present embodiment, the glossiness sensor 12 corresponds to “glossiness detection means”.
The procedure of “paper printing process (5)” executed by the CPU 60 included in the control unit 50 will be described below with reference to the flowcharts of FIGS.

[Description of paper printing process (5)]
First, the paper P is fed (S510). Specifically, the leading edge of the paper P is transported to a registration position that is a contact point between the transport roller 41 and the pinch roller 42 as in the above embodiment. Then, the glossiness sensor 12 detects the glossiness of the paper (S512). Specifically, the glossiness sensor 12 detects the glossiness of the surface of the paper P as described above. Then, the first conveyance correction value and the second conveyance correction value are read from the glossiness of the sheet (S514). Specifically, the glossiness of the paper P, the data indicating the two transport sections in which the paper P is transported, and the data indicating the transport correction values corresponding to the two transport sections are associated with each other and provided in the ROM 62. The CPU 60 reads out the first conveyance correction value and the second conveyance correction value corresponding to the detected glossiness of the sheet from the glossiness data stored in the memory areas 96a and 96b of the glossiness data being stored. Then, when the process of S514 is completed, the process of S516 is performed.

  In the process of S516, the paper P is initially conveyed. Specifically, the leading end of the drawing area on the paper P placed at the registration position as in the above embodiment is conveyed to the image forming point GP. Next, main scanning printing is executed (S518). Specifically, ink is ejected from the recording head 15 to form an image on the paper P as in the above embodiment. Then, when the process of S518 is completed, the process of S520 is performed.

  In the process of S520, it is determined whether or not the carry amount of the paper P is acquired from the computer 100. Specifically, as in the above embodiment, the CPU 60 determines whether the transport amount of the paper P has been acquired from the computer 100 via the USB interface unit 86. Here, as in the above-described embodiment, the transport amount of the paper P is, for example, image formation of the reference points of the paper P positioned at the transport start point GS sequentially at intervals corresponding to the width of the image forming region RG in the transport direction. It refers to the transport amount transported to the point GP. When the transport amount of the paper P transmitted from the computer 100 is acquired (S520: YES), the paper transport position is calculated (S522 shown in FIG. 18). Specifically, the CPU 60 calculates the paper transport position by adding the transport amount of the paper P acquired in the process of S520 after the paper P is initially transported in the process of S516 as in the above embodiment. Then, when the process of S522 is completed, the process of S524 is performed.

  In the process of S524, it is determined whether or not the paper transport position is the first transport section. Specifically, the CPU 60 determines whether or not the paper transport position calculated in the process of S522 is the first transport section read in the process of S514. If the paper transport position is the first transport section (S524: YES), a first transport correction value is set (S526). Specifically, the glossiness of the paper P, the data indicating the two transport sections in which the paper P is transported, and the data indicating the transport correction values corresponding to the two transport sections are associated with each other and provided in the ROM 62. The CPU 60 reads out the first paper correction value corresponding to the glossiness of the acquired paper and the first transport section from the glossiness data stored in the memory areas 96a and 96b of the glossiness data being stored. Then, the CPU 60 controls the ASIC 70 to store the read first conveyance correction value in a ROM (not shown) that stores the conveyance correction value of the ASIC 70. On the other hand, when the paper transport position is not the first transport section (S524: NO), the second transport correction value is set (S528). Specifically, the glossiness of the paper P, the data indicating the two transport sections in which the paper P is transported, and the data indicating the transport correction values corresponding to the two transport sections are associated with each other and provided in the ROM 62. The CPU 60 reads out the detected paper glossiness and the second transport correction value corresponding to the second transport section from the paper type data stored in the memory areas 96a and 96b of the paper type data being stored. Then, the CPU 60 controls the ASIC 70 to store the read second conveyance correction value in a ROM (not shown) that stores the conveyance correction value of the ASIC 70. Then, when the process of S526 or the process of S528 is completed, the process of S530 is performed.

  In the process of S530, the paper P is transported with the transport correction value set in the process of S526 or the process of S528. Specifically, the CPU 60 controls the ASIC 70 to transport the paper P by the transport amount of the paper P acquired in the process of S520. Then, the ASIC 70 controls the motor driving unit 82 to read the conveyance correction value set in the process of S526 or S528 from the ROM included in the ASIC 70, and the sheet P is read based on the read conveyance correction value in S520. In this process, the paper P is transported by the transport amount obtained. Then, when the process of S530 is completed, the process of S532 is performed.

  In the process of S532, it is determined whether or not the paper printing is completed. If the paper printing has not been completed (S532: NO), the process returns to S518 (see FIG. 17) and the above-described processing is performed. On the other hand, when the paper printing is completed (S532: YES), the paper P is discharged (S534). Specifically, the CPU 60 controls the ASIC 70 to discharge the paper P. Then, the ASIC 70 controls the motor driving unit 82 to rotate the transport roller 41 and the paper discharge roller 43 to discharge the paper P to the paper discharge unit 21.

Then, when the process of S534 is completed, the “paper printing process (5)” is completed.
[effect]
As described above, glossiness data is provided in which the glossiness of the paper P, the data indicating the two transport sections in which the paper P is transported, and the data indicating the transport correction value corresponding to the two transport sections are associated with each other. It has been.

  Then, by executing the paper printing process (5) described above, the glossiness of the surface of the paper is detected to determine whether the paper type is plain paper or glossy paper. Even for different papers and papers with different paper thicknesses, the variation in paper conveyance deviation between when the paper is pressed by the paper feed roller and when the paper is not pressed by the paper feed roller is reduced. Can be prevented.

  (5) In the above embodiment, the number of the paper feed cassette 4 is one, but the present invention is not limited to this. There may be a plurality of paper cassettes. Then, a first conveyance correction value and a second conveyance correction value corresponding to the first conveyance section and the second conveyance section may be set for each of the plurality of paper feed cassettes. Specifically, as illustrated in FIG. 19, two paper feed cassettes 4 and 4 'are provided. Each of the paper feed cassettes 4 and 4 ′ includes paper feed units 9 and 9 ′ that separate and send the paper P stored in the paper feed cassettes 4 and 4 ′ one by one. Each of the paper feed units 9 and 9 ′ includes paper feed rollers 9 b and 9 b ′ that transmit the rotational force generated from the paper transport motor 45 via a transmission mechanism (not shown). Further, as illustrated in FIG. 20A, memory areas 98 a and 98 b for paper tray data are provided in the ROM 62. This paper tray data will be described below.

(E) Paper Tray Data Paper tray data refers to paper trays (a), (b) corresponding to the paper feed cassettes 4, 4 ′, as illustrated in FIGS. 20 (b) and 20 (c), Data indicating two transport sections in which the paper P is transported and data indicating transport correction values corresponding to the two transport sections are associated with each other.

  As illustrated in FIGS. 20B and 20C, the paper tray data includes a paper tray (a), a numerical value “1” of the transport section (1), and a transport correction value (A). The sheet conveyance data is associated and stored in the memory area 98a (1). Further, the sheet tray (a), the numerical value “2” of the conveyance section (2), and the conveyance correction value (B) are associated and stored in the memory area 98a (2) of the sheet conveyance data. The paper type (b) is also stored in the memory areas 98b (1) and 98b (2) of the paper tray data, respectively.

In this embodiment, the USB interface unit 86 corresponds to “paper feed unit information acquisition unit”.
Hereinafter, the procedure of “paper printing process (6)” executed by the CPU 60 included in the control unit 50 will be described with reference to the flowcharts of FIGS.

[Description of paper printing process (6)]
First, the paper tray data received by the computer 100 is transmitted from the computer 100 to the control unit 50. The CPU 60 determines whether or not the paper tray data has been acquired from the computer 100 via the USB interface unit 86. Judgment is made (S610). When the paper type data transmitted from the computer 100 is acquired (S610: YES), the first transport correction value and the second transport correction value corresponding to the acquired paper tray are read (S612). Specifically, the paper trays (a) and (b), data indicating two transport sections in which the paper P is transported, and data indicating transport correction values corresponding to the two transport sections are associated with each other. The CPU 60 obtains the first conveyance correction value and the second conveyance correction value corresponding to the sheet tray acquired from the sheet tray data stored in the memory areas 98a and 98b of the sheet type data provided in the ROM 62. read out. Then, when the process of S612 is completed, the process of S614 is performed. In the above-described processing of S610, the paper tray data is received by the computer 100, but the present invention is not limited to this. The paper tray data received by the operation panel unit 29 may be transmitted to the CPU 60 by the panel interface unit 84.

  In the process of S614, the paper P is fed. Specifically, the leading edge of the paper P is transported to a registration position that is a contact point between the transport roller 41 and the pinch roller 42 as in the above embodiment. Then, the paper P is initially conveyed (S616). Specifically, the leading end of the drawing area on the paper P placed at the registration position as in the above embodiment is conveyed to the image forming point GP. Next, main scanning printing is executed (S618). Specifically, ink is ejected from the recording head 15 to form an image on the paper P as in the above embodiment. Then, when the process of S618 is completed, the process of S620 is performed.

  In the process of S620, it is determined whether the transport amount of the paper P is acquired from the computer 100. Specifically, as in the above embodiment, the CPU 60 determines whether the transport amount of the paper P has been acquired from the computer 100 via the USB interface unit 86. Here, as in the above-described embodiment, the transport amount of the paper P is, for example, image formation of the reference points of the paper P positioned at the transport start point GS sequentially at intervals corresponding to the width of the image forming region RG in the transport direction. It refers to the transport amount transported to the point GP. When the transport amount of the paper P transmitted from the computer 100 is acquired (S620: YES), the paper transport position is calculated (S622 shown in FIG. 22). Specifically, the CPU 60 calculates the paper transport position by adding the transport amount of the paper P acquired in the process of S620 after the paper P is initially transported in the process of S616 as in the above embodiment. Then, when the process of S622 ends, the process of S624 is performed.

  In the process of S624, it is determined whether or not the paper transport position is the first transport section. Specifically, the CPU 60 determines whether or not the paper transport position calculated in the process of S622 is the first transport section read in the process of S612. If the paper transport position is the first transport section (S624: YES), a first transport correction value is set (S626). Specifically, the paper trays (a) and (b), data indicating two transport sections in which the paper P is transported, and data indicating transport correction values corresponding to the two transport sections are associated with each other. The CPU 60 sets the first transport correction value corresponding to the paper tray and the first transport section acquired from the paper tray data stored in the memory areas 98a and 98b of the paper type data provided in the ROM 62. read out. Then, the CPU 60 controls the ASIC 70 to store the read first conveyance correction value in a ROM (not shown) that stores the conveyance correction value of the ASIC 70. On the other hand, when the paper transport position is not the first transport section (S624: NO), a second transport correction value is set (S628). Specifically, the paper trays (a) and (b), data indicating two transport sections in which the paper P is transported, and data indicating transport correction values corresponding to the two transport sections are associated with each other. The CPU 60 sets the second transport correction value corresponding to the paper tray acquired from the paper tray data stored in the memory areas 98a and 98b of the paper tray data provided in the ROM 62 and the second transport section. read out. Then, the CPU 60 controls the ASIC 70 to store the read second conveyance correction value in a ROM (not shown) that stores the conveyance correction value of the ASIC 70. Then, when the process of S626 or the process of S628 is completed, the process of S630 is performed.

  In the process of S630, the paper P is transported with the transport correction value set in the process of S626 or the process of S628. Specifically, the CPU 60 controls the ASIC 70 to transport the paper P by the transport amount of the paper P acquired in the process of S620. Then, the ASIC 70 controls the motor driving unit 82 to read the conveyance correction value set in the process of S626 or S628 from the ROM included in the ASIC 70, and the sheet P is read based on the read conveyance correction value in S620. In this process, the paper P is transported by the transport amount obtained. Then, when the process of S630 ends, the process of S632 is performed.

  In the process of S632, it is determined whether or not the paper printing is completed. If the paper printing is not completed (S632: NO), the process returns to S618 (see FIG. 21) and the above-described processing is performed. On the other hand, when the paper printing is completed (S632: YES), the paper P is discharged (S634). Specifically, the CPU 60 controls the ASIC 70 to discharge the paper P. Then, the ASIC 70 controls the motor driving unit 82 to rotate the transport roller 41 and the paper discharge roller 43 to discharge the paper P to the paper discharge unit 21.

Then, when the process of S634 is completed, the “paper printing process (6)” is completed.
[effect]
As described above, the paper trays (a) and (b), the data indicating the two transport sections in which the paper P is transported, and the data indicating the transport correction value corresponding to the two transport sections are associated with each other. Type data is provided.

  Then, by executing the paper printing process (6) described above, the first conveyance correction value and the first value that are appropriate for the first conveyance section and the second conveyance section for each of the plurality of paper feed cassettes. 2 conveyance correction values can be set.

  Therefore, according to the shape and distance of the conveyance path in which the sheets stored in the sheet feeding cassettes 4 and 4 ′ are sent out from the sheet feeding units 9 and 9 ′ and conveyed, By appropriately setting the transport correction value of 2, the transport deviation can be corrected. That is, for each of the paper feeding units 9 and 9 ′, the change in paper conveyance deviation between when the paper is pressed against the paper feeding rollers 9b and 9b ′ and when the paper is not pressed is reduced, and printing unevenness is prevented. it can.

  (6) In the above embodiment, the transport section is the two sections of the first transport section and the second transport section. However, the present invention is not limited to this. When the sheet conveyance resistance differs depending on three or more conveyance sections in which the sheet is conveyed, each conveyance section includes a case where the sheet is pulled between the paper discharge roller 43 and the pinch roller (spur roller) 44, for example. An appropriate conveyance correction value may be set.

  In this way, when the conveyance resistance of the sheet differs depending on three or more conveyance sections in which the sheet is conveyed, the conveyance deviation can be corrected by setting an appropriate conveyance correction value for each conveyance section. it can.

(7) In the above embodiment, there are two types of paper sizes, but the present invention is not limited to this. Three or more types of paper sizes may be supported.
In this way, even when three or more types of paper are different in length in the transport direction, the paper is in a case where the paper is pressed by the paper feed roller and in a case where the paper is not pressed by the paper feed roller. The change in the amount of conveyance deviation can be reduced, and the occurrence of uneven printing can be prevented.

1 is a perspective view of a multi-function device 1 to which an ink jet recording apparatus 3 of the present invention is applied. 1 is a side sectional view of a multi-function device 1 to which an ink jet recording apparatus 3 of the present invention is applied. FIG. 3 is an explanatory diagram illustrating a schematic configuration of a transport unit 40 and a control unit 50 that configure a paper transport mechanism 6 of the inkjet recording apparatus 3. 3 is a block diagram of an electrical configuration of the inkjet recording apparatus 3. FIG. It is explanatory drawing which shows the result of having measured the conveyance shift amount which is a difference with the actual conveyance amount with respect to a theoretical conveyance amount. 5 is an explanatory diagram showing a correction value data memory area 90 and a paper size data memory area 92 provided in a ROM 62. FIG. 7 is a flowchart showing the first half of the procedure of “paper printing process (1)” executed by a CPU 60 provided in the control unit 50. 7 is a flowchart illustrating the second half of the procedure of “paper printing process (1)” executed by a CPU 60 included in the control unit 50. 7 is a flowchart showing the first half of a procedure of “paper printing process (2)” executed by a CPU 60 provided in the control unit 50. 7 is a flowchart illustrating the second half of the procedure of “paper printing process (2)” executed by a CPU 60 included in the control unit 50. 7 is a flowchart showing the first half of a procedure of “paper printing process (3)” executed by a CPU 60 provided in the control unit 50. 10 is a flowchart illustrating the second half of the procedure of “paper printing process (3)” executed by a CPU 60 included in the control unit 50. It is explanatory drawing which shows the memory areas 94a and 94b of the paper type data provided in ROM62. 10 is a flowchart showing the first half of a procedure of “paper printing process (4)” executed by a CPU 60 provided in the control unit 50. 7 is a flowchart illustrating the second half of the procedure of “paper printing process (4)” executed by a CPU 60 provided in the control unit 50. It is explanatory drawing which shows the memory areas 96a and 96b of the glossiness data provided in ROM62. 7 is a flowchart showing the first half of a procedure of “paper printing process (5)” executed by a CPU 60 provided in the control unit 50. 7 is a flowchart illustrating the second half of the procedure of “paper printing process (5)” executed by a CPU 60 provided in the control unit 50. FIG. 3 is an explanatory diagram showing a schematic configuration of a transport unit 40 and a control unit 50 that constitute a paper transport mechanism of an ink jet recording apparatus that includes two paper feed cassettes 4 and 4 ′. 6 is an explanatory diagram showing memory areas 98a and 98b of paper tray data provided in a ROM 62. FIG. 7 is a flowchart showing the first half of a procedure of “paper printing process (6)” executed by a CPU 60 provided in the control unit 50. 10 is a flowchart showing the second half of the procedure of “paper printing process (6)” executed by the CPU 60 provided in the control unit 50.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Multifunctional device, 2 ... Housing, 2a ... Opening part, 3 ... Inkjet recording device, 4, 4 '... Paper feed cassette, 4a ... Auxiliary support member, 4b ... Storage part, 5 ... Bank part, 6 ... Paper conveyance Mechanism: 7 ... Box-type main frame, 9, 9 '... Paper feed unit, 9a ... Paper feed arm, 9b, 9b' ... Paper feed roller, 10 ... Paper bottom sensor, 11 ... U-turn path, 11a ... Auxiliary part, 12 DESCRIPTION OF SYMBOLS ... Glossiness sensor, 13 ... Image forming part, 14 ... Paper conveyance sensor, 15 ... Recording head, 16 ... Carriage motor, 17 ... Carriage, 18 ... Carriage encoder, 19 ... Platen, 21 ... Paper discharge part, 21a ... Paper discharge 23: Image reading device, 23a: Bottom wall, 23b: Pivot axis, 25: Upper cover body, 27 ... Document cover body, 29 ... Operation panel, 31 ... Glass plate for placement, 33 ... Image scanner device, 35 ... guide 37: Ink supply pipe, 40 ... Conveying section, 41 ... Conveying roller, 42 ... Pinch roller, 43 ... Discharge roller, 44 ... Pinch roller (spur roller), 45 ... Paper conveying motor, 49 ... Paper conveying encoder, 50 ... Control unit, 60 ... CPU, 62 ... ROM, 64 ... RAM, 66 ... EEPROM, 68 ... Bus, 70 ... ASIC, 80 ... Head drive unit, 82 ... Motor drive unit, 84 ... Panel interface unit, 86 ... USB Interface section 90 ... Memory area for correction value data, 92 ... Memory area for paper size data, 94a, 94b ... Memory area for paper type data, 96a, 96b ... Memory area for glossiness data, 98a, 98b ... Paper tray data Memory area, 100 ... computer, BL1, BL2 ... belt, P ... paper.

Claims (14)

A recording head capable of selectively ejecting ink toward the paper;
A carriage mounted with the recording head and reciprocating in a predetermined direction;
A paper feeding unit capable of accommodating a plurality of sheets of paper,
Separating means for separating and sending out the sheets stored in the sheet feeding unit one by one;
A conveying unit that intermittently conveys the sheet sent out by the separating unit in a direction substantially orthogonal to the predetermined direction when the recording head is not discharging ink;
Determining means for determining whether the paper transport position is in the first transport section or the second transport section;
Controlling the separating means to separate and send out the paper stored in the paper feeding unit one by one; controlling the conveying means to convey the sent paper; and controlling the determining means And determining whether the paper transport position is in the first transport section or the second transport section, and controlling the recording head and the carriage to move the carriage and ink by the recording head. Control means for executing a printing process for storing an image on the paper by repeatedly performing the discharge and intermittent conveyance by the conveyance means;
Storage means for storing a first transport correction value corresponding to the first transport section and a second transport correction value corresponding to the second transport section;
With
The control means includes
When the determination unit determines that the sheet conveyance position is in the first conveyance section, the first conveyance correction value stored in the storage unit is read, and the read first conveyance correction value is used. And controlling the conveying means to convey the sheet based on the second conveying position stored in the storage means when the determining means determines that the conveying position of the sheet is in the second conveying section. An inkjet recording apparatus that reads a correction value and controls the conveying unit to convey a sheet based on the read second conveyance correction value. The inkjet recording apparatus according to claim 1, wherein
Acquisition means for acquiring a plurality of types of paper sizes having different length dimensions in the paper conveyance direction;
Paper size storage means for storing length dimensions in the transport direction of the paper corresponding to the different paper sizes;
With
The paper feeding unit is configured to be capable of accommodating a plurality of different papers,
The determination means includes
The length dimension in the conveyance direction of the paper corresponding to the paper size acquired by the acquisition means is read from the paper size storage means, and the read length dimension in the conveyance direction of the paper is detected by the detection means. An ink jet recording apparatus that determines whether the paper transport position is in the first transport section or the second transport section based on the transport position of the received paper. The inkjet recording apparatus according to claim 1, wherein
A trailing edge detecting means for detecting that the paper sent by the separating means is separated from the separating means;
The determination means includes
If the trailing edge detection unit does not detect that the sheet has been separated from the separation unit, the sheet conveyance position is in the first conveyance section, and if it is detected that the sheet has separated from the separation unit, An ink jet recording apparatus that determines that the transport position is in the second transport section. In the ink jet recording apparatus according to any one of claims 1 to 3,
A paper type acquisition means for acquiring the type of one of a plurality of types of paper;
The storage means stores a first conveyance correction value and a second conveyance correction value corresponding to the plurality of types of sheets,
The control means includes
When the determination unit determines that the sheet conveyance position is in the first conveyance section, the first conveyance correction value corresponding to the sheet type acquired by the sheet type acquisition unit is stored from the storage unit. The conveyance unit is controlled to convey the sheet based on the read and read first conveyance correction value, and when the determination unit determines that the sheet conveyance position is in the second conveyance section, Reading a second transport correction value corresponding to the paper type acquired by the paper type acquisition unit from the storage unit and controlling the transport unit to transport the paper based on the read second transport correction value. An ink jet recording apparatus. In the ink jet recording apparatus according to any one of claims 1 to 3,
Glossiness detecting means for detecting the glossiness of the surface of the paper is provided,
The storage means stores a first transport correction value and a second transport correction value corresponding to the glossiness of the surface of the paper,
The control means includes
When the determination unit determines that the sheet conveyance position is in the first conveyance section, the first conveyance correction value corresponding to the glossiness of the surface of the sheet detected by the glossiness detection unit is set as the first conveyance correction value. When the conveyance unit is controlled to convey the sheet based on the read first conveyance correction value read from the storage unit, and the determination unit determines that the sheet conveyance position is in the second conveyance section. Reads out a second conveyance correction value corresponding to the glossiness of the surface of the paper detected by the glossiness detection means from the storage means, and conveys the paper based on the read second conveyance correction value. An ink jet recording apparatus that controls a conveying means. In the ink jet recording apparatus according to any one of claims 1 to 3,
A plurality of paper feed units capable of accommodating a plurality of sheets and having different identification information;
Separating means for separating and sending out the sheets respectively accommodated corresponding to the plurality of paper feeding units;
Paper feed unit information obtaining means for obtaining one piece of identification information in the plurality of paper feed units;
With
The storage means stores a first conveyance correction value and a second conveyance correction value corresponding to the identification information of the plurality of paper feeding units,
The control means includes
When the determination unit determines that the sheet conveyance position is in the first conveyance section, the storage unit stores a first conveyance correction value corresponding to the identification information acquired by the sheet feeding unit information acquisition unit. When the conveyance unit is controlled to convey the sheet based on the read first conveyance correction value, and the determination unit determines that the sheet conveyance position is in the second conveyance section, A second conveyance correction value corresponding to the identification information acquired by the paper feed unit information acquisition unit is read from the storage unit, and the conveyance unit is controlled to convey the sheet based on the read second conveyance correction value. An ink jet recording apparatus. The inkjet recording apparatus according to claim 4, wherein
A plurality of paper feed units capable of accommodating a plurality of sheets and having different identification information;
Separating means for separating and sending out the sheets respectively accommodated corresponding to the plurality of paper feeding units;
Paper feed unit information obtaining means for obtaining one piece of identification information in the plurality of paper feed units;
With
The storage means stores a first conveyance correction value and a second conveyance correction value corresponding to the identification information of the plurality of paper feeding units and the types of paper, respectively.
The control means includes
When the determination unit determines that the paper transport position is in the first transport section, the identification information acquired by the paper feed unit information acquisition unit and the paper type acquired by the paper type acquisition unit Are read from the storage means, the transport means is controlled to transport the paper based on the read first transport correction value, and the paper transport position is determined by the determination means. A second conveyance correction value corresponding to the identification information acquired by the paper feed unit information acquisition unit and the paper type acquired by the paper type acquisition unit. Is read from the storage means, and the conveying means is controlled to convey the sheet based on the read second conveyance correction value. The inkjet recording apparatus according to claim 5, wherein
A plurality of paper feed units capable of accommodating a plurality of sheets and having different identification information;
Separating means for separating and sending out the sheets respectively accommodated corresponding to the plurality of paper feeding units;
Paper feed unit information obtaining means for obtaining one piece of identification information in the plurality of paper feed units;
With
The storage means stores a first conveyance correction value and a second conveyance correction value corresponding to the identification information of the plurality of paper feeding units and the glossiness of the surface of the paper, respectively.
The control means includes
When the determination unit determines that the sheet conveyance position is in the first conveyance section, the identification information acquired by the sheet feeding unit information acquisition unit and the surface of the sheet detected by the gloss level detection unit The first conveyance correction value corresponding to the glossiness of the image is read from the storage unit, the conveyance unit is controlled to convey the sheet based on the read first conveyance correction value, and the determination unit conveys the sheet. When it is determined that the position is in the second conveyance section, it corresponds to the identification information acquired by the paper feed unit information acquisition unit and the gloss level of the surface of the paper detected by the gloss level detection unit. An ink jet recording apparatus that reads a second conveyance correction value from the storage unit and controls the conveyance unit to convey a sheet based on the read second conveyance correction value. A recording head capable of selectively ejecting ink toward the paper;
A carriage mounted with the recording head and reciprocating in a predetermined direction;
A paper feeding unit capable of accommodating a plurality of sheets of paper,
Separating means for separating and sending out the sheets stored in the sheet feeding unit one by one;
A conveying unit that intermittently conveys the sheet sent out by the separating unit in a direction substantially orthogonal to the predetermined direction when the recording head is not discharging ink;
Detecting means for detecting a transport position of the paper transported by the transport means;
The separation unit is controlled to separate and feed the sheets stored in the sheet feeding unit one by one, and the transport unit is controlled to transport the fed sheet, and the recording head, the carriage Control means for executing a printing process for recording an image on the paper by repeatedly performing movement of the carriage, ejection of ink by the recording head, and intermittent conveyance by the conveyance means,
Storage means for storing a first transport correction value and a second transport correction value;
With
The control means includes
The first conveyance correction value stored in the storage unit is read, and the conveyance unit is controlled to convey a predetermined amount of paper based on the read first conveyance correction value. A paper conveyance amount corresponding to a predetermined amount is calculated based on a paper conveyance position detected by the detection unit, a difference between the calculated paper conveyance amount and the predetermined amount is calculated, and the calculated difference Alternatively, when the accumulated value of the difference exceeds a predetermined value, the second conveyance correction value stored in the storage unit is read, and the conveyance unit is configured to convey the sheet based on the read second conveyance correction value. An ink jet recording apparatus for controlling. The inkjet recording apparatus according to claim 9, wherein
A paper type acquisition means for acquiring the type of one of a plurality of types of paper;
The storage means stores a first conveyance correction value and a second conveyance correction value corresponding to the plurality of types of sheets,
The control means includes
Reading the first conveyance correction value corresponding to the paper type acquired by the paper type acquisition unit from the storage unit, and setting the conveyance unit to convey a predetermined amount of paper based on the read first conveyance correction value. And each time the predetermined amount is conveyed, a sheet conveyance amount corresponding to the predetermined amount is calculated based on the sheet conveyance position detected by the detection unit, and the calculated sheet conveyance amount and the predetermined amount are calculated. When the calculated difference or the accumulated value of the difference exceeds a predetermined value, a second transport correction value corresponding to the paper type acquired by the paper type acquisition unit is obtained from the storage unit. An ink jet recording apparatus that controls the transport unit to transport the paper based on the read and read second transport correction value. The inkjet recording apparatus according to claim 9, wherein
Glossiness detecting means for detecting the glossiness of the surface of the paper is provided,
The storage means stores a first transport correction value and a second transport correction value corresponding to the glossiness of the surface of the paper,
The control means includes
The first conveyance correction value corresponding to the glossiness of the surface of the paper detected by the glossiness detection means is read from the storage means, and the paper is conveyed by a predetermined amount based on the read first conveyance correction value. Controlling the conveyance means, and calculating the conveyance amount of the paper corresponding to the predetermined amount based on the conveyance position of the paper detected by the detection means every time the predetermined amount is conveyed, and the calculated conveyance amount of the paper, A second transport correction corresponding to the glossiness of the surface of the paper detected by the glossiness detecting means when the difference with the predetermined amount is calculated and the calculated difference or the accumulated value of the difference exceeds the predetermined value An inkjet recording apparatus, wherein a value is read from the storage unit, and the conveyance unit is controlled to convey a sheet based on the read second conveyance correction value. The inkjet recording apparatus according to claim 9, wherein
A plurality of paper feed units capable of accommodating a plurality of sheets and having different identification information;
Separating means for separating and sending out the sheets respectively accommodated corresponding to the plurality of paper feeding units;
Paper feed unit information obtaining means for obtaining one piece of identification information in the plurality of paper feed units;
With
The storage means stores a first conveyance correction value and a second conveyance correction value corresponding to the identification information of the plurality of paper feeding units,
The control means includes
The transport unit reads out a first transport correction value corresponding to the identification information acquired by the paper feed unit information acquisition unit from the storage unit, and transports a predetermined amount of paper based on the read first transport correction value. Each time the predetermined amount is conveyed, a sheet conveyance amount corresponding to the predetermined amount is calculated based on the sheet conveyance position detected by the detection unit, and the calculated sheet conveyance amount and the predetermined position are calculated. The difference with the fixed amount is calculated, and when the calculated difference or the accumulated value of the difference exceeds a predetermined value, the second conveyance correction value corresponding to the identification information acquired by the sheet feeding unit information acquisition unit is stored in the memory. An inkjet recording apparatus that controls the conveying unit to convey a sheet based on the read second conveyance correction value. The inkjet recording apparatus according to claim 10, wherein
A plurality of paper feed units capable of accommodating a plurality of sheets and having different identification information;
Separating means for separating and sending out the sheets respectively accommodated corresponding to the plurality of paper feeding units;
Paper feed unit information obtaining means for obtaining one piece of identification information in the plurality of paper feed units;
With
The storage means stores a first conveyance correction value and a second conveyance correction value corresponding to the identification information of the plurality of paper feeding units and the types of paper, respectively.
The control means includes
A first transport correction value corresponding to the identification information acquired by the paper feed unit information acquisition unit and the paper type acquired by the paper type acquisition unit is read from the storage unit, and the read first transport correction is read out. The transport unit is controlled to transport a predetermined amount of paper based on the value, and the transport amount of the paper corresponding to the predetermined amount is transported based on the transport position of the paper detected by the detection unit each time the predetermined amount is transported. The difference between the calculated transport amount of the sheet and the predetermined amount is calculated, and the calculated difference or the accumulated value of the difference exceeds the predetermined value, and is acquired by the paper feed unit information acquisition unit A second transport correction value corresponding to the identification information and the paper type acquired by the paper type acquisition unit is read from the storage unit, and the paper is transported based on the read second transport correction value. An ink jet recording apparatus characterized by controlling the transport means to. The inkjet recording apparatus according to claim 11, wherein
A plurality of paper feed units capable of accommodating a plurality of sheets and having different identification information;
Separating means for separating and sending out the sheets respectively accommodated corresponding to the plurality of paper feeding units;
Paper feed unit information obtaining means for obtaining one piece of identification information in the plurality of paper feed units;
With
The storage means stores a first conveyance correction value and a second conveyance correction value corresponding to the identification information of the plurality of paper feeding units and the glossiness of the surface of the paper, respectively.
The control means includes
A first transport correction value corresponding to the identification information acquired by the paper feed unit information acquisition unit and the gloss level of the surface of the paper detected by the gloss level detection unit is read from the storage unit, and the read first value is read out. The transport unit controls the transport unit to transport a predetermined amount of paper based on the transport correction value, and the transport position of the paper detected by the detection unit for the transport amount of the paper corresponding to the predetermined amount every time the predetermined amount is transported And the difference between the calculated transport amount of the paper and the predetermined amount is calculated, and when the calculated difference or the accumulated value of the difference exceeds a predetermined value, the paper feeding unit information acquisition means A second conveyance correction value corresponding to the acquired identification information and the glossiness of the surface of the paper detected by the glossiness detection means is read from the storage means, and based on the read second conveyance correction value. An ink jet recording apparatus characterized by controlling the transport means to convey the sheet Te.