JP2014141038A - Ink jet recording device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ink jet recording device capable of preventing reduction of image formation reproducibility without changing an ink discharge amount.SOLUTION: An ink jet recording device includes an ink jet head, a conveyance roller motor, a plurality of storage cassettes, a sheet type information acquisition device, and a controller. The plurality of storage cassettes stores recording media on which images are formed. The sheet type information acquisition device processes the sheet type information of the recording medium stored in each of the plurality of storage cassettes. The controller calculates ink information for forming an image, determines a recording medium on which an image is formed by the ink jet head on the basis of the ink information and the sheet type information obtained by the sheet type information acquisition device, and instructs delivery of the recording medium from the storage cassette storing the determined storage medium.

Description

  Embodiments described herein relate generally to an ink jet recording apparatus.

  An ink jet recording apparatus forms an image by ejecting ink droplets from an ink jet head onto a sheet as a recording medium. When an image is formed by an ink jet recording apparatus, when a large amount of ink droplets are ejected from the ink jet head to the image recorded on the first surface which is the surface, or when the paper is thin, the image is recorded on the surface. There was a phenomenon of showing-through, which is said to be behind-the-scenes. In order to prevent the phenomenon of show-through, a table with ink discharge amount that does not cause show-through according to the paper type is provided, and the ink discharge amount is obtained from the table based on the selected paper type. Ink was discharged from the ink jet from the amount.

JP 2002-137382 A

  The problem to be solved by the embodiments of the present invention is that when the ink ejection amount is changed depending on the type of paper, the quality of the image changes depending on the type of paper for image formation. Accordingly, an object of the present invention is to provide an ink jet recording apparatus that can prevent the reproducibility of image formation from decreasing without changing the ink ejection amount.

  In order to solve the above problems, an ink jet recording apparatus according to an embodiment of the present invention includes an ink jet head, a transport roller motor, a plurality of storage cassettes, a paper type information acquisition device, and a controller. The ink jet head ejects ink droplets. The conveyance roller motor conveys a recording medium on which an image is formed by ink ejected from the inkjet head in the direction of the inkjet head. The plurality of storage cassettes store recording media on which images are formed. The paper type information acquisition device processes the paper type information of the recording media individually stored in the plurality of storage cassettes. The controller calculates ink information for forming an image, determines a recording medium on which an image is formed by the inkjet head based on the ink information and the paper type information obtained from the paper type information acquisition device, and the determination An instruction is given to feed out the recording medium from the storage cassette in which the recorded recording medium is stored, and ink droplets are ejected from the inkjet head to form an image.

1 is a longitudinal sectional view of an ink jet recording apparatus according to an embodiment. 1 is an electrical block diagram of an ink jet recording apparatus according to an embodiment. It is a main flowchart which concerns on embodiment. It is a flowchart of storage cassette judgment processing A concerning an embodiment. It is a storage cassette judgment processing B flowchart concerning a 1st embodiment. It is a storage cassette judgment processing B flow chart concerning a 2nd embodiment.

Hereinafter, the first embodiment will be described with reference to the drawings.
(First embodiment)
FIG. 1 is a longitudinal sectional view of an ink jet recording apparatus 1 according to the first embodiment. The ink jet recording apparatus includes a paper feed unit 10, a transport unit 20, an image forming unit 30, a paper discharge unit 50, a display unit 60, and the like.

The paper supply unit 10 includes a first storage cassette 11 that stores and stores paper P that is a recording medium, a first paper supply roller 12 that picks up paper stored in the first storage cassette 11, A second storage cassette 13 that stores and stacks the paper P, a second paper feed roller 14 that picks up the paper P stored in the second storage cassette 13, and a second that stores the paper P in a stacked manner. 3 storage cassettes 15, a third paper feed roller 16 for picking up the paper P stored in the third storage cassette 15, and the like.
The transport unit 20 is disposed along the transport guide 21 for guiding the paper P fed from the first storage cassette 11, the second storage cassette 13, and the third storage cassette 15, and the transport guide 21. A plurality of conveyance rollers 22 and a registration roller 23 disposed at a position immediately before the image forming unit 30 are provided.

  The image forming unit 30 transports the paper P having a plurality of ink jet heads 31 that discharge ink onto the paper P according to data, an ink tank 32 that supplies ink to the plurality of ink jet heads 31, and holes on the surface. Conveying belt 41, a plurality of rollers 42 to 44 provided inside the conveying belt 41, a negative pressure chamber 45 provided inside the conveying belt 41, a fan 46, a negative pressure chamber 45 and a fan 46, A duct 47 or the like that connects the two is provided.

  The plurality of inkjet heads 31 have different signs for each ink color. That is, a black inkjet head 31B that discharges black ink, a yellow inkjet head 31Y that discharges yellow ink, a magenta inkjet head 31M that discharges magenta ink, and a cyan inkjet head 31C that discharges cyan ink. In each inkjet head 31, nozzles that eject ink in a direction orthogonal to the paper transport direction are formed on the line at predetermined intervals. That is, each inkjet head is a line-type inkjet head having a distance longer than the paper width. The line-type inkjet head may be realized by a single head, or a part of a plurality of heads may be overlapped and arranged in a staggered manner to form a single-color inkjet head. The inkjet heads 31 are arranged in the order of a black inkjet head 31B, a yellow inkjet head 31Y, a magenta inkjet head 31M, and a cyan inkjet head 31C from the downstream side in the transport direction of the paper P.

  The image forming unit 30 includes a black ink tank 32B connected to the black inkjet head 31B, a yellow ink tank 32Y connected to the yellow inkjet head 31Y, and a magenta ink tank 32M connected to the magenta inkjet head 31M. And a cyan ink tank 32C connected to the cyan inkjet head 31C.

  In addition, the paper discharge unit 50 includes a first paper discharge guide 51 for guiding the paper P sent out from the image forming unit 30 and a plurality of first papers disposed along the first paper discharge guide 51. The paper discharge roller 52 is disposed. In addition, the first flapper 53 is disposed downstream of the first paper discharge roller 52 in the transport direction of the paper P, and downstream of the first flapper 53 in the transport direction of the paper P. A second paper discharge guide 54 for guiding the paper P on the side and a second paper discharge roller 55 are arranged. Further, a paper guide 56 different from the second paper discharge guide 54 for guiding the paper P and a paper guide 56 are arranged on the downstream side of the first flapper 53 with respect to the transport direction of the paper P. A plurality of paper rollers 57 are arranged.

  The transport unit 20 is connected to a paper feed guide 21 and a paper guide 56. Further, a second flapper 58 is disposed near the registration roller 23 at a position where the paper feed guide 21 and the paper guide 56 are connected. The paper feed guide 21, the paper feed roller 22, the second flapper 58, the registration roller 23, the paper guide 56, and the paper roller 57 are configured as a reversing mechanism that reverses the direction of the paper P. . When the paper P is disposed across both the paper guide 56 and the paper feed guide 21, there is a timing at which the paper P is held between the paper feed roller 22 and the paper roller 57 at the same time.

When the paper P advances in the direction of the paper guide 56 in the paper discharge unit 50, the first paper discharge guide pair 51 and the paper discharge roller 52 have the same functions as the paper guide 56 and the paper roller 57. It is not a paper discharge function.

  The ink jet recording apparatus 1 has a display unit 60 in a housing portion. The display unit 60 includes a display 61 for displaying an internal state and an operation panel (operation panel) 62 on which a plurality of buttons are arranged. Although not shown, the plurality of buttons are touch panels and are shared with the display 61.

  Although three storage cassettes are shown in the drawing, the number of storage cassettes is not limited to three, and any number of a plurality of storage cassettes may be used for storing different types of paper. Moreover, although it is set as a cassette as an example, a tray-shaped thing may be sufficient and a tray-shaped thing is also defined as a storage cassette in this Embodiment.

  Next, a block diagram relating to control of the ink jet recording apparatus 1 of the present embodiment will be described with reference to FIG.

  The inkjet recording apparatus 1 temporarily stores a CPU (Central Control Unit) 101 that is a controller, a ROM (Read Only Memory) 102 that stores various programs, and various variable data and thumbtack data. A random access memory (RAM) 103 and an interface (I / F) 104 for inputting data from the outside and outputting data from the outside. The CPU 101 is connected to the ROM 102, RAM 103, and 1 / F 104 via the bus 100.

  In addition, the inkjet recording apparatus 1 includes a paper feed / conveyance / paper discharge control drive circuit 110, an inkjet head control drive circuit 130, a sensor control circuit 140, a belt drive motor control drive circuit 150, A fan control drive circuit 160 and a display operation panel control circuit 170 are connected. The paper feed / conveyance / paper discharge control drive circuit 110 includes a paper feed roller motor 112 for rotating the paper feed roller 12, a paper feed roller motor 114 for rotating the paper feed roller 14, and the paper feed roller 16. It is connected to a paper feed roller motor 116 for rotation.

  The paper feed / conveyance / discharge control drive circuit 110 includes a conveyance roller motor 122 for rotating the plurality of conveyance rollers 22 and the registration rollers 23, and a paper roller motor 123 for rotating the plurality of paper rollers 57. The first discharge roller 52 and the second discharge roller 55 are connected to a discharge roller motor 124 for rotating the first discharge roller 52 and the second discharge roller 55. Further, the paper feed / conveyance / paper discharge control drive circuit 110 includes a switching solenoid 125 for changing the direction of the tip of the first flapper 53, a switching solenoid 126 for changing the direction of the tip of the second flapper 58, and the like. Connected. The conveyance roller motor 122 conveys a recording medium on which an image is formed by ink ejected from the inkjet head in the direction of the inkjet head.

  The inkjet head control drive circuit 130 is connected to the black inkjet 31B, the yellow inkjet 31Y, the magenta inkjet 31M, and the cyan inkjet 31C. The sensor control circuit 140 is disposed in the paper sensor 141 disposed in the first storage cassette 11, the paper sensor 143 disposed in the second storage cassette 13, and the third storage cassette 15. Connected to the paper sensor 145 and the like. The sensor control circuit 140, the paper sensors 141, 143, 145 and the like constitute a paper type information acquisition device. The paper type information acquisition device processes the paper type information of the recording media individually stored in the plurality of storage cassettes.

  The belt drive motor control drive circuit 150 is connected to a belt drive motor 151 for rotating a roller 44 provided inside the transport belt 41. The fan control drive circuit 160 is connected to a fan motor 161 for rotating the fan 46.

  The sheet sensors 141, 143, and 145 are placed in a direction orthogonal to the conveyance direction of the sheet P, that is, on the side surfaces of the first storage cassette 11 to the third storage cassette 15, and the individual thicknesses of the stacked sheets P Including an optical sensor for measuring. Each paper sensor has a light emitting element disposed on one side surface of the storage cassette and a light receiving element on the side surface opposite to the side surface on which the light emitting element is disposed. Light emitted from the light emitting element passes through the stacked sheets and is input to the opposite light receiving element side. The CPU 101 estimates the thickness of the stacked sheets based on the interval at which the light is received.

  Here, the printing operation of the inkjet recording apparatus 1 will be described. First, the single-sided printing operation by the inkjet recording apparatus 1 will be described. When the inkjet recording apparatus 1 receives print (recording) data from the outside via the I / F 104, the first storage cassette 11, the second storage cassette 13, and the third storage are based on the paper type information. It is determined from which cassette 15 the paper P is fed. Details of this determination will be described later. When it is determined from which storage cassette the paper is fed, the paper feed roller motor corresponding to the paper feed roller corresponding to the paper cassette is rotated to feed the paper P. For example, if the paper stored in the first storage cassette 11 corresponds to the paper type information, the CPU 101 drives the paper supply roller motor 112 to the paper supply / conveyance / discharge control circuit 110. To instruct. As a result, the paper feed roller motor 112 rotates, whereby the first paper feed roller 12 rotates and the paper P stored in the first storage cassette 11 is fed. The paper P fed by the first paper feed roller 12 or the like is transported in the transport guide 21 by the transport roller motor 122 and transported in the direction of the registration roller 23. The sheet P is further conveyed at a predetermined timing after the leading edge of the sheet P comes into contact with the registration roller 23. The paper P is also transported when the transport belt 41 is moved by the belt drive motor 151 connected to the roller 44. When the paper P is transported by the transport belt 41, the transport belt 41 is sucked by the fan 46 and is in close contact with the negative pressure chamber 45. Further, the paper P is also in close contact with the transport belt through a hole provided in the surface of the transport belt 41. The first surface (front surface) of the paper P is printed by the ink ejected from the inkjet head 31 based on the print data received while being transported by the transport belt 41. In the case of monochrome printing, printing is performed only by the black inkjet 31B, and in the case of color printing, printing is performed by ejecting ink from the black inkjet head 31B, the yellow inkjet head 31Y, the magenta inkjet head 31M, and the cyan inkjet head 310. When the paper P is further conveyed, the paper P is discharged to the outside of the ink jet recording apparatus 1 by the first paper discharge roller 52 and the second paper discharge roller 55.

  Next, the double-sided printing operation by the inkjet recording apparatus 1 will be described. When the inkjet recording apparatus 1 receives print (recording) data from the outside via the I / F 104, the first paper cassette 11, the second paper cassette 13, and the third paper based on the paper type information. It is determined from which cassette 15 the paper P is fed. If it is determined from which paper cassette the paper is fed, the paper feed roller motor corresponding to the paper feed roller corresponding to the paper cassette is rotated to feed the paper P. For example, if the sheet stored in the first sheet cassette 11 corresponds to the sheet type information, the CPU 101 drives the sheet feed roller motor 112 to the sheet feed / conveyance / discharge control drive circuit 110. Instruct. As a result, the paper feed roller motor 112 rotates, whereby the first paper feed roller 12 rotates and the paper P stored in the first storage cassette 11 is fed. The paper P fed by the first paper feed roller 12 or the like is transported in the transport guide 21 by the transport roller motor 122 and transported in the direction of the registration roller 23. The paper P is further transported at a predetermined timing after the leading edge of the paper P comes into contact with the registration roller 23. The paper P is also transported when the transport belt 41 is moved by the transport roller motor 122 connected to the roller 44. Is done.

  The first surface (front surface) of the paper P is printed by the ink ejected from the inkjet head 31 based on the print data received while being transported by the transport belt 41. In the case of monochrome printing, printing is performed only by the black inkjet head 31B, and in the case of color printing, printing is performed by discharging ink from the black inkjet head 31B, the yellow inkjet head 31Y, the magenta inkjet head 31M, and the cyan inkjet head 31C.

  When the sheet P is further conveyed, the sheet P is moved along the first sheet discharge guide 53 by the first sheet discharge roller 52. In this case, the first paper discharge guide 51 functions as a paper transport guide. When the first side printing of double-sided printing is completed, the first flapper 53 drives the paper feed / conveyance / discharge control drive circuit 110 to block the path to the second discharge roller side by the switching solenoid 125. Placed in position. The paper P is guided toward the paper guide 56 by the first flapper 53. The paper P guided to the paper guide 56 is conveyed by driving a paper roller motor 123 connected to the paper roller 57. When the paper P is transported by the paper roller motor 123, the second flapper 58 is disposed at a position that covers the registration roller 53 by the switching solenoid 126 by driving the paper feed / transport / discharge control drive circuit 110. So that it is controlled. Therefore, the conveyance path formed by the sheet guide 56 and the conveyance guide 21 connected to the third storage cassette 15 shown on the left side of FIG. At the timing when the rear end of the paper P is positioned closer to the paper feed guide 21 than the second flapper 58, the CPU 101 causes the paper feed / conveyance '· to stop the rotation of the paper roller motor 123 and the transport roller motor 122. Commands the discharge control drive circuit 110.

  After a predetermined time of the stop command, the CPU 101 issues a reverse rotation instruction to the paper feed / conveyance / discharge control drive circuit 110 and also instructs the second flapper 58 to block between the paper guide 56 and the conveyance guide 21. put out. Since the process of printing the sheet P in the direction of the registration roller 23 and printing the sheet P on the second side (back side) and the subsequent processes are the same as those described above, the description is omitted.

  Next, using the flowchart of FIG. 3, printing is performed using any of the sheets stored in the first storage cassette 11, the second storage cassette 13, and the third storage cassette 15 based on the sheet type information. The process of determining whether will be described. If a print instruction is detected from the outside of the inkjet recording apparatus 1 via the I / F 104, the CPU 101 determines whether the instruction content is single-sided printing or double-sided printing (A301). That is, it is determined whether it is single-sided printing for printing only the first side or double-sided printing for printing both the first side and the second side. If it is determined that the printing is duplex printing (Yes in A301), the CPU 101 analyzes the image of both the first surface and the second surface of the received print data in units of printing surfaces (A302). Next, the CPU 101 calculates a predicted use amount of ink, which is ink information used on the first surface (A303). Similarly, the CPU 101 calculates a predicted use amount of ink used on the second surface (A304). The predicted use amount of the ink used on the first side and the second side may be a unit of the entire side of the sheet P, or may be a predetermined area of the entire side. In the weaving of the present embodiment, a case will be described in which processing is performed in units of one entire surface.

  The CPU 101 determines which storage cassette of the inkjet recording apparatus 1 is used for printing based on the prediction of the amount of ink used on the first and second surfaces (storage cassette). Judgment processing A / A305). This will be described in detail as a sub-flow of the storage cassette determination process.

  The CPU 101 stores the storage cassette information designated in the storage cassette determination process in a predetermined area of the RAM 103 (A306). The CPU 101 instructs the inkjet control drive circuit 130 to print the received data using the inkjet head 31, and starts the printing operation (A307). In the case of the instruction A307, an instruction to feed and print the paper P stored in the storage cassette designated in the storage cassette determination process A and an instruction to feed out the recording medium from the storage cassette are also performed. Further, in order to prevent print-out data received via the I / F 104 from being shown back, the CPU 101 is configured so that the drop information notification received from the I / F 104 is executed as it is without correction for changing the ink drop amount. Is processing.

  If the CPU 101 determines that single-sided printing is performed (No in A301), the first surface of the received print data is subjected to image analysis in units of printing surfaces (A312). Next, the CPU 101 obtains the estimated amount of ink used on the first surface (A313). The expected amount of ink used on the second side may be a unit of the entire side of the sheet P, or may be a predetermined area of the entire side. That is, the processing may be divided into a plurality of blocks on one side. In the present embodiment, a case where processing is performed on the entire one side as a unit will be described. The CPU 101 determines which storage cassette of the inkjet recording apparatus 1 is to be used for printing based on the estimated amount of ink used on the first surface (storage cassette determination processing: B400). This will be described in detail as a sub-flow of this storage cassette judgment process.

  Next, the storage cassette determination process A will be described with reference to FIG. The CPU 101 determines whether the surface serving as the determination reference is the first surface or the second surface (A331). That is, the CPU 101 determines whether the maximum amount of ink to be used is the first side or the second side. This is because the surface with the larger estimated ink usage is more likely to show through. If the determination criterion is the first surface side (Yes in A331), the CPU 101 sets the first surface side as the determination criterion (A332). That is, this is a case where the CPU 101 determines that the estimated amount of ink usage on the first side is greater than that on the second side. The CPU 101 performs storage cassette determination processing B based on the estimated ink usage on the first surface (A400). If the determination criterion is not the first surface side (No in A331), the CPU 101 sets the second surface side as the determination criterion. That is, the CPU 101 determines that the estimated amount of ink used on the second side is greater than that on the first side. The CPU 101 performs storage cassette determination processing B based on the predicted ink usage on the second surface (A400).

  Next, the storage cassette determination process B (A400) will be described with reference to FIG. The CPU 101 determines whether or not the estimated ink use amount (total ink amount) on the first surface is aμl or less (A401). If the estimated ink use amount is not more than a μl (Yes in A401), the CPU 101 determines whether or not the paper P is stored in the first storage cassette 11 (A402). This is because the predicted amount of ink used is not more than the lower limit value of a μl, so that it can be determined that the image is not shown even if the image is printed on the thinnest paper stored in the inkjet recording device 1. Therefore, it is confirmed whether or not there is a sheet containing the thinnest sheet P. Which thickness of paper is stored in which storage cassette is determined using the sensor control circuit 130 when the ink jet recording apparatus 1 is started up. If the paper P is not stored in the first storage cassette 11 (No in A402), the CPU 101 displays a display / overpanel control circuit to issue a message to replenish the paper P in the first storage cassette 11 170 is instructed (A403). When issuing a message, it is desirable to indicate the type of paper in the message so that it does not differ from the type of paper previously stored. After a predetermined output of a message that the first storage cassette 11 is replenished with paper, the CPU 101 determines A402 again. At this time, if it is determined that a different type of paper from the stored paper type is stored, an error message is sent and a refill message is sent again. If it is determined that the paper P is stored in the first storage cassette 11 (Yes in A402), the CPU 101 stores the paper used to feed the paper stored in the first storage cassette 11. The cassette 11 stores in the predetermined area of the RAM 103 that it is the first one storage cassette (A404).

  If the estimated ink use amount is not less than aμl (NO in A401), the CPU 101 determines whether the estimated ink use amount on the first surface is greater than aμl and less than bμl (A405). If both predictions of ink usage are b μl or less (Yes in A405), the CPU 101 determines whether or not the paper P is stored in the second storage cassette 13 (A406). The paper P stored in the second storage cassette 13 is thicker than the paper P stored in the first storage cassette 11 and is a paper P that does not show through even if the estimated ink usage is b μl. There is a premise. Whether or not the predetermined paper P is stored is determined using the sensor control circuit 130 when the ink jet recording apparatus 1 is started up. If the paper P is not stored in the second storage cassette 13 (N0 in A406), the CPU 101 controls the display and the operation panel so as to issue a message to replenish the paper P in the second storage cassette 13. An instruction is given to the circuit 170 (A408). When issuing a message, it is desirable to indicate the type of paper in the message so that it does not differ from the type of paper previously stored. After a predetermined time when a message indicating that the second storage cassette 13 is replenished with paper is output, the CPU 101 determines A406 again. At this time, if it is determined that a different type of paper from the stored paper type is stored, an error message is sent and a refill message is sent again. If it is determined that the paper P is stored in the second storage cassette 13 (Yes in A406), the CPU 101 uses it to feed the paper stored in the second storage cassette 13. It is stored in a predetermined area of the RAM 103 that the cassette to be stored is the second storage cassette 13 (A408).

  If the predicted ink use amount is not less than bμl (No in A405), the CPU 101 determines that the predicted ink use amount on the first surface is larger than bμl and determines whether the paper P is stored in the third storage cassette 15. (A409). The paper P stored in the third storage cassette 15 is thicker than the paper P stored in the second storage cassette 13 and is the thickest paper P among the papers P stored in each storage cassette. It is a premise. Whether the predetermined paper P is stored is determined by using the sensor control circuit 130 when the ink jet recording apparatus 1 is started up. If the paper P is not stored in the third storage cassette 15 (NO in A409), the CPU 101 controls the display and the operation panel so as to issue a message to replenish the paper P in the third storage cassette 15. An instruction is given to the circuit 17O (A410). When issuing a message, the message relates to the type of paper so that the same type of paper P as the paper P stored in the first storage cassette 11 and the second storage cassette 13 is not stored. It is desirable to show information. After a predetermined output of the message that the third storage cassette 15 is replenished with paper, the CPU 101 makes the determination of A409 again. In this way, if it is determined that the same type of paper P as the paper P stored in the first storage cassette 11 and the second storage cassette 13 is stored, an error message is issued and a refill message is again displayed. Do. If it is determined that the paper P is stored in the third storage cassette 15 (Yes in A409), the CPU 101 uses it to feed the paper stored in the third storage cassette 15. The fact that the storage cassette is the third storage cassette 15 is stored in a predetermined area of the RAM 103 (A411). Information stored in a predetermined area of the RAM 103 in A404, A408, and A411 is used as information on the designated storage cassette in the process of A306 shown in the main flowchart of FIG.

  As in the present embodiment, since printing is performed on paper having different thicknesses based on the estimated ink usage, it is possible to prevent paper show-back. In addition, the ink drop amount of each pixel is implemented based on the data transmitted from the outside via the I / F, and the reproducibility and stability of image formation, or the problem of saturation reduction due to insufficient density Does not occur. Furthermore, since this is a color ink jet recording apparatus, the total amount of ink is larger than that of monochrome printing, which is also useful in this respect.

Next, a second embodiment will be described.
(Second Embodiment)
3 and 4 are the same as those in the first embodiment, and thus the description thereof is omitted. However, the description will be made by changing the storage cassette determination process B in FIG. 4 to A500. The storage cassette determination process B (A500) will be described with reference to FIG. In FIG. 6, the CPU 101 determines whether or not the printing area ratio of the first surface is equal to or less than x% (A501). If the area ratio is equal to or less than x% (Yes in A501), the CPU 104 determines whether or not the sheet P is stored in the first storage cassette 11 (A502). As described above, in the second embodiment, the process that is determined based on the estimated ink use amount in the first embodiment is changed to the print area ratio. The area ratio is ink information. Since the actions A502 to A504 of the second embodiment are the same as the actions A402 to A404 in the first embodiment, description thereof will be omitted. In the second embodiment, the action A505 is changed under the condition that the estimated ink use amount in the first embodiment A405 is greater than aμl and less than or equal to bμl, and the area ratio is greater than x% and less than or equal to Y%. The description is omitted because it is the same except for the above. In addition, the operations of A506 to A511 in the second embodiment are the same as the operations of A406 to A411 in the first embodiment, and thus description thereof is omitted. In A505, when the CPU 101 determines that the printing area is not less than Y%, it is determined that it exceeds Y%.

  Since printing is performed on papers having different thicknesses based on the area ratio of printing, it is possible to prevent the paper from showing back. In addition, the amount of ink drop for each discard is implemented based on the data transmitted from the outside via the I / F, and there is a problem of image formation reproducibility and stability, or saturation reduction due to insufficient density. Does not occur.

  The print type information has been described based on the thickness information of the paper P in both the first embodiment and the second actual planting form, but is not limited to this. Paper basis weight information may be used as the paper type information. In addition, information on the degree of permeability, which is the flow rate of air that permeates in the thickness direction of the paper under certain conditions (pressure difference per unit area and time), and the degree of permeability that allows light to escape to the opposite side of the paper. May be used. Further, in order to determine the paper type information, as in the first and second embodiments, a paper type information acquisition device is provided in the inkjet recording apparatus 1, and the paper P is stored in the storage cassette. The paper type information may be acquired in advance so that it is stored in advance in the ROM 102 of the inkjet recording apparatus 1 and candidates are displayed on the display 61 and are determined based on an operator's instruction from the operation panel 62. A device may be configured. The paper type information does not include information indicating the area (size) of the paper such as A3 and A4.

  In the embodiment, the paper P is provided with the paper reversing mechanism, and the ink jet recording apparatus that performs double-sided printing with the common inkjet head has been described. However, the present invention is not limited to this. The two sides may be printed by different interjet heads. The ink jet recording apparatus has been described with respect to a print function for performing printing based on print data printed from the outside. However, the present invention is not limited to this, and an apparatus having a scanner function such as a copying machine also corresponds to the ink jet recording apparatus.

  According to the ink jet recording apparatus of at least one embodiment described above, the recording medium on which an image is formed by the ink jet head is determined by the controller based on the paper type information. In addition, the ink drop amount of each pixel is realized based on the data transmitted via the I / F from the outside, and there is a problem of re-degradation and stability of image formation, or a drop again due to insufficient density. Does not occur. _

  Although several embodiments have been described, these embodiments have been presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and modifications thereof are included in the gist of the invention, and in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 1 ... Inkjet recording apparatus 10 ... Paper feed part 11 ... 1st storage cassette 11 ... 2nd storage cassette 11 ... 3rd storage cassette 20 ... Conveyance part 30 ... Image formation part 31 ... Inkjet head 61 ... Display device 101 ... CPU
112 ... paper feed roller motor (first paper feed roller motor)
114 ... paper feed roller motor (second paper feed roller motor)
116: paper feed roller motor (third paper feed roller motor)
140 ... Sensor control circuit
141: Paper sensor (first paper sensor)
143 ... Paper sensor (second paper sensor)
145 ... Paper sensor (third paper sensor)

Claims (3)

An inkjet head that ejects ink drops;
A transport roller motor for transporting a recording medium on which an image is formed by ink ejected from the ink jet head in the direction of the ink jet head;
A plurality of storage cassettes for storing recording media on which images are formed;
A paper type information acquisition device for processing paper type information of recording media individually stored in the plurality of storage cassettes;
Ink information for forming an image is calculated, a recording medium on which an image is formed by the inkjet head is determined based on the ink information and the paper type information obtained from the paper type information acquisition device, and the determined recording Instructing to feed out the recording medium from the storage cassette in which the medium is stored, and a controller for ejecting ink droplets from the inkjet head to form an image,
An ink jet recording apparatus comprising:   2. An ink jet recording apparatus according to claim 1, wherein an image is formed on one surface of the recording medium and the other surface with different ink jet heads.   3. The ink jet recording apparatus according to claim 1, wherein the paper type information acquiring device is provided for each of the plurality of storage cassettes and includes an optical sensor for measuring a thickness of the recording medium.

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