Patent Publication Number: US-10780701-B2

Title: Liquid ejecting apparatus

Description:
BACKGROUND 
     1. Technical Field 
     The present invention relates to a liquid ejecting apparatus including a waste liquid flow path which is a flow path of ink sucked from a nozzle of an ink ejecting unit. 
     2. Related Art 
     In the related art, JP-A-2017-196794 is known as this type of technology. In JP-A-2017-196794, the liquid ejecting apparatus that includes the waste liquid flow path which is the flow path of ink sucked from the nozzle of a head and cleans the waste liquid flow path by supplying cleaning liquid to the waste liquid flow path, is disclosed. 
     However, since ink remaining in a waste liquid flow path solidifies with the lapse of time, it is necessary to clean the waste liquid flow path by cleaning liquid, and there is room for improvement on how to use the cleaning liquid. 
     SUMMARY 
     According to an aspect of the invention, there is provided a liquid ejecting apparatus including an ink ejecting unit that ejects ink from a nozzle, a waste liquid flow path that is a flow path of the ink sucked from the nozzle, a suction unit that performs an ink suction operation of sucking the ink from the nozzle via the waste liquid flow path, a cleaning unit that performs a cleaning operation of supplying cleaning liquid from a cleaning liquid storage unit that stores the cleaning liquid to the waste liquid flow path, and a control unit that controls the cleaning unit so that a supply amount of the cleaning liquid varies depending on an elapsed time from when the ink suction operation is performed, when the cleaning operation is performed. 
     According to this configuration of the invention, when the cleaning operation is performed, since the cleaning unit is controlled so that the supply amount of the cleaning liquid varies according to an elapsed time from when the ink suction operation is performed, it is possible to clean the waste liquid flow path by the cleaning liquid of an amount suitable for the elapsed time. Accordingly, it is possible to suppress an excessive use of the cleaning liquid, and, as a result, it is possible to suppress a use amount of the cleaning liquid. An amount of the cleaning liquid to be used may be varied depending on a type of ink sucked by the ink suction operation and the elapsed time from when the ink suction operation is performed. 
     In the liquid ejecting apparatus, the control unit may cause the cleaning unit to perform the cleaning operation with a reference supply amount when a reference time elapses from when the ink suction operation is performed, and cause the cleaning unit to perform the cleaning operation with a supply amount smaller than the reference supply amount when a trigger for starting the cleaning operation is generated, before the reference time elapses. 
     According to this configuration, by the cleaning operation performed when the trigger for starting the cleaning operation is generated, it is possible to suppress a use amount of cleaning liquid as compared to the cleaning operation performed when the reference time elapses from when the ink suction operation is performed. 
     In the liquid ejecting apparatus, the trigger for starting the cleaning operation may be at least one of power OFF of the liquid ejecting apparatus and an operation for starting the cleaning operation. 
     According to this configuration, in the cleaning operation performed when at least one of power OFF of the liquid ejecting apparatus and an operation for starting the cleaning operation is generated, it is possible to suppress the use amount of the cleaning liquid. 
     In the liquid ejecting apparatus, the suction unit may function as the cleaning unit by sucking the cleaning liquid from a cleaning liquid storage unit via the waste liquid flow path. 
     According to this configuration, since the suction unit functions as the cleaning unit, it is possible to simplify a device configuration. 
     In the liquid ejecting apparatus, the liquid ejecting apparatus may further include a cleaning liquid ejecting unit that ejects the cleaning liquid from the nozzle, and the suction unit may suck the cleaning liquid from the nozzle of the cleaning liquid ejecting unit via the waste liquid flow path. 
     According to this configuration, similar to the suction of the ink from the nozzle of the ink ejecting unit, by sucking the cleaning liquid from the nozzle of the cleaning liquid ejecting unit, it is possible to supply the cleaning liquid. 
     In the liquid ejecting apparatus, the ink ejecting unit and the cleaning liquid ejecting unit may be provided in a single head. 
     According to this configuration, since it is possible to perform the ejecting of the ink by the ink ejecting unit and the ejecting of the cleaning liquid by the cleaning liquid ejecting unit with the single head, it is possible to simplify a device configuration. 
     In the liquid ejecting apparatus, the liquid ejecting apparatus may further include an acquisition unit that acquires an environment temperature, and the control unit may control the cleaning unit so that the supply amount of the cleaning liquid varies depending on the acquired environment temperature. 
     According to this configuration, since the cleaning unit is controlled so that the supply amount of the cleaning liquid varies depending on not only the elapsed time from when the ink suction operation is performed but also the environment temperature, it is possible to more effectively suppress the use amount of the cleaning liquid. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The invention will be described with reference to the accompanying drawings, wherein like numbers reference like elements. 
         FIG. 1  is a diagram illustrating a schematic configuration of a printer according to an embodiment of the invention. 
         FIG. 2  is a diagram illustrating an array of nozzles provided in a head. 
         FIG. 3  is a block diagram illustrating a control system of the printer. 
         FIG. 4  is a flowchart illustrating a cleaning process according to a first embodiment. 
         FIG. 5  is an explanatory diagram of a cleaning process according to a second embodiment. 
         FIG. 6  is a graph illustrating a relationship between an elapsed time from when an ink suction operation is performed and a suction amount of the cleaning liquid according to the second embodiment. 
         FIG. 7  is a graph illustrating a relationship between an elapsed time from when the ink suction operation is performed and a suction amount of the cleaning liquid according to a third embodiment. 
         FIG. 8  is a graph illustrating a relationship between an elapsed time from when the ink suction operation is performed and a suction amount of the cleaning liquid according to a fourth embodiment. 
     
    
    
     DESCRIPTION OF EXEMPLARY EMBODIMENTS 
     First Embodiment 
     Hereinafter, an embodiment of the invention will be described with reference to the drawings. In the present embodiment, as an example of a liquid ejecting apparatus, an ink jet printer  1  is exemplified. 
       FIG. 1  is a diagram illustrating a schematic configuration of the printer  1  according to an embodiment of the invention. The printer  1  includes a support base  5 , a carriage  21 , a carriage moving mechanism  22 , a guide shaft  23 , a head  24 , an ink cartridge  25 , an ink supply flow path  26 , a cleaning liquid cartridge  27 , a cleaning liquid supply flow path  28 , a suction unit  30 , and a control unit  10 . 
     The support base  5  supports a print medium  6 . The print medium  6  is transported in a Y direction (depth direction in  FIG. 1 ) by a medium transporting mechanism (not illustrated) in a state of being supported by the support base  5 . The guide shaft  23  extending along an X direction (horizontal direction in  FIG. 1 ) is bridged above the support base  5 . The carriage  21  mounts the head  24  and is reciprocated in the X direction by the carriage moving mechanism  22  while being supported by the guide shaft  23 . 
     The carriage moving mechanism  22  includes a driving pulley  22   a , a driven pulley  22   b , a timing belt  22   c , and a carriage motor  22   d . Power is transmitted from the carriage motor  22   d  to the driving pulley  22   a  and an endless timing belt  22   c  partly connected to the carriage  21  is stretched between the driving pulley  22   a  and the driven pulley  22   b . That is, the carriage  21  reciprocates in the X direction via the timing belt  22   c  by driving force of the carriage motor  22   d.    
     Meanwhile, the head  24  includes a nozzle forming surface  24   a  on which a plurality of nozzles are formed. As illustrated in  FIG. 2 , a nozzle row  40  configured with a plurality of nozzles arranged along the Y direction and at predetermined intervals in the X direction is formed on the nozzle forming surface  24   a  of the head  24 . The number of nozzles included in each nozzle row  40  and the nozzle intervals in the Y direction are all common. 
     As the nozzle row  40 , the head  24  illustrated in  FIG. 2  includes a plurality of ink nozzle rows  41  for ejecting ink for each ink color and one cleaning liquid nozzle row  42  for ejecting the cleaning liquid. Here, the cleaning liquid refers to liquid for cleaning a waste liquid flow path  34  (which will be described below). The cleaning liquid is not particularly limited as long as it can dissolve a solidified ink. However, for example, solvent of ink can be used. Each of the plurality of ink nozzle rows  41  corresponds to ink colors of cyan, magenta, yellow, white, and black. The white ink is an ink containing a white pigment component and is a kind of white liquid. As white pigment, for example, titanium dioxide can be suitably used. In addition, white is a color that is visually perceived as white and is not limited to achromatic white. However, for example, the white means that it also includes a slightly tinged white called off white or ivory white. 
     Arrangement of the colors of the plurality of ink nozzle rows  41 , the number of the ink nozzle rows  41 , a position of the cleaning liquid nozzle row  42 , and the number of the cleaning liquid nozzle rows  42  are arbitrary irrespective of an example illustrated in  FIG. 2 . In addition, in  FIG. 2 , an example in which each nozzle row  40  is configured with one nozzle row, is illustrated, but each nozzle row  40  may be configured with a plurality of nozzle rows. The ink nozzle row  41  is an example of an “ink ejecting unit” of the invention. In addition, the cleaning liquid nozzle row  42  is an example of a “cleaning liquid ejecting unit” of the invention. 
     Returning to explanation of  FIG. 1 , the ink cartridge  25  stores ink for each ink color and supplies ink to the head  24  via the ink supply flow path  26 . The cleaning liquid cartridge  27  stores the cleaning liquid, and supplies the cleaning liquid to the head  24  via the cleaning liquid supply flow path  28 . The cleaning liquid cartridge  27  is an example of a “cleaning liquid storage unit” of the invention. 
     The suction unit  30  performs suction of ink and the cleaning liquid, and is provided at a home position where the print medium  6  and the head  24  do not face each other. The suction unit  30  includes a suction cap  31 , an elevating device  32 , a maintenance motor  33 , a waste liquid flow path  34 , a suction pump  35 , a suction motor  36 , and a waste liquid storage unit  37 . The suction unit  30  is an example of a “cleaning unit” of the invention. 
     A dry prevention cap for suppressing the evaporation of ink in the nozzle at the time of printing pause, a wiper for wiping ink from the nozzle forming surface  24   a , a flushing box for receiving the ink ejected from the head  24  and the like may be provided at the home position in addition to the suction unit  30 . 
     The suction cap  31  seals the nozzles in units of the nozzle row  40 . The suction cap  31  is a cap for sucking the ink from the ink nozzle row  41  in order to prevent clogging of the nozzle due to thickening of ink. In addition, the suction cap  31  is used for sucking the cleaning liquid from the cleaning liquid nozzle row  42 . The elevating device  32  elevates and moves the suction cap  31  in a Z direction (in a vertical direction in  FIG. 1 ) between a contact position where the suction cap  31  can contact the nozzle forming surface  24   a  of the head  24  and a non-contact position where it does not contact the nozzle forming surface  24   a , by driving force of the maintenance motor  33 . Accordingly, it is possible to suck ink and the cleaning liquid for each nozzle row selectively. In addition, in a case of a nozzle row unit, a plurality of nozzle rows may be capped and sucked. At this time, nozzle rows of different ink types may be simultaneously sucked. 
     One end of the waste liquid flow path  34  is connected to the suction cap  31  and the suction pump  35  for generating the negative pressure in the waste liquid flow path  34  is provided in the middle of the waste liquid flow path  34 . The suction pump  35  sucks ink and the cleaning liquid by the driving force of the suction motor  36 . The waste liquid storage unit  37  stores the ink and the cleaning liquid sucked by the suction pump  35 . In the present embodiment, it is assumed that the waste liquid flow path  34  indicates a flow path from the suction cap  31  to the waste liquid storage unit  37 . 
     The control unit  10  drives and controls the carriage motor  22   d , the head  24 , the maintenance motor  33 , the suction motor  36 , and the like such that a printing process and a maintenance process are performed. As the maintenance process, a cleaning process of cleaning the head  24  by sucking ink and the cleaning process of cleaning the waste liquid flow path  34  by sucking the cleaning liquid, are performed. 
     Here, the maintenance process will be simply described. First, the cleaning process will be described. For example, if the cleaning process is instructed by a user, the cleaning process is performed when a predetermined time elapses from when the previous cleaning process is performed. 
     When the cleaning process starts and the carriage motor  22   d  is driven, and then the control unit  10  causes the carriage  21  to stop at a position where the ink nozzle row  41  to be a cleaning target and the suction cap  31  are positioned to oppose each other, among the ink nozzle rows  41  formed on the nozzle forming surface  24   a . The control unit  10  causes the suction cap  31  to be elevated up and moved to a contact position by driving the maintenance motor  33 . 
     The control unit  10  causes the suction pump  35  to be driven by the suction motor  36 , and ink to be sucked from the nozzle of the ink nozzle row  41  which is the cleaning target. The sucked ink is discharged to the waste liquid storage unit  37  via the waste liquid flow path  34 . At this time, some of the ink remains in the waste liquid flow path  34 . Viscosity of the remaining ink increases by drying with the passage of time and the ink is solidified. In the cleaning process, an operation in which the suction unit  30  sucks ink from nozzles of respective ink nozzle rows  41 , is referred to as an “ink suction operation”. 
     Next, the cleaning process will be described. The printer  1  of the present embodiment performs the cleaning process when a reference time elapses from when the ink suction process is performed. The reference time may be a predetermined time and may be a time designated by the user. In addition, for example, in a case where the reference time is the predetermined time, a length of the reference time is 12 hours. 
     When the cleaning process starts, the control unit  10  causes the carriage motor  22   d  to be driven and then the control unit  10  causes the carriage  21  to stop at a position where the cleaning liquid nozzle row  42  formed on the nozzle forming surface  24   a  and the suction cap  31  are positioned to oppose each other. The control unit  10  causes the suction cap  31  to be elevated up and moved to the contact position by driving the maintenance motor  33 . 
     The control unit  10  operates the suction pump  35  by driving the suction motor  36 , and sucks the cleaning liquid from a nozzle of the cleaning liquid nozzle row  42 . The sucked cleaning liquid is discharged to the waste liquid storage unit  37  via the waste liquid flow path  34 . By the suction of cleaning liquid, the ink remaining in the waste liquid flow path  34  is dissolved by the cleaning liquid and an inside of the waste liquid flow path  34  is cleaned. In the cleaning process, an operation in which the suction unit  30  sucks the cleaning liquid from the nozzle of the cleaning liquid nozzle row  42 , is referred to as a “cleaning operation”. 
     When the cleaning operation is performed, the control unit  10  causes driving control of the suction motor  36  to be performed to vary a suction amount of the cleaning liquid depending on a color of the ink sucked by the ink suction operation. More specifically, since the white ink which is the base ink among the cyan, magenta, yellow, white, and black inks, is quickly increasing in viscosity and easy to dry and to solidify, as compared with ink of other colors, in a case where the white ink is sucked, it is controlled to increase the suction amount of the cleaning liquid as compared with a case where the white ink is not sucked. Details will be described below. 
     Next, with reference to  FIG. 3 , a control system of the printer  1  will be described. The printer  1  includes the control unit  10 , a temperature sensor  15 , an interface  16 , an operation panel  17 , a power switch  18 , the carriage motor  22   d , the head  24 , the maintenance motor  33 , and the suction motor  36  as the control system, and they are connected to each other via a bus  19 . 
     The control unit  10  includes a central processing unit (CPU)  11 , a read-only memory (ROM)  12 , a random access memory (RAM)  13 , and a timer  14 . The CPU  11  performs inputting and outputting of signals to each unit in the printer  1  via the bus  19 , and is a processor of performing various calculation processes. The processor may be configured with a plurality of CPUs, and may be configured with a hardware circuit such as an application specific integrated circuit (ASIC). The ROM  12  is a non-volatile storage medium and stores programs such as firmware. 
     The RAM  13  is a volatile storage medium and is used as a work area of the CPU  11 . In addition, the RAM  13  includes a log storage area  13   a  of storing an operation log of the printer  1 . A date at which turn ON and OFF of power source of the printer  1 , the printing process, the cleaning process, the cleaning process, and the like are performed, is stored in the log storage area  13   a . More specifically, cleaning information including an ink color corresponding to the ink nozzle row  41  to be a target of the cleaning process and a date and a time at which the ink suction operation is completed in the cleaning process, is stored in the log storage area  13   a.    
     The timer  14  counts a date and a time required for recording of an operation log. In addition, the timer  14  is used for determining a performance timing of the cleaning process. That is, the timer  14  starts counting of an elapsed time from a time at which the first ink suction operation is completed after an initial activation or after the previous cleaning operation in the printer  1 . When a counted value of the timer  14  reaches the reference time, that is, when the reference time elapses from when the ink suction operation is performed, the printer  1  performs the cleaning process. A start timing of the counting of the timer  14  may be a time at which the ink suction operation starts instead of the time at which the ink suction operation is completed. In addition, when the cleaning process is completed, the timer  14  resets the counted value. 
     The temperature sensor  15  is attached to the head  24 , and detects an abnormal temperature of the head  24 . In a case where the abnormal temperature is detected by the temperature sensor  15 , the control unit  10  causes error notification and a power disconnection process to be performed. The temperature sensor  15  is an example of an “acquisition unit” of the invention. 
     The interface  16  is a communication unit for performing communication with an external device  100 , for example, the reception of various types of information including a print job from the external device  100  and the like. For example, it is possible to use a personal computer as the external device  100 . 
     For example, the operation panel  17  is a display to which a touch sensor is attached, and is used as an operation unit and a display unit. For example, the operation panel  17  is used for setting a printing mode. In the present embodiment, it is possible to set anyone printing mode of a white mode in which white ink is used and a non-white mode in which the white ink is not used. For example, the white ink is used for forming a white base in a case where the print medium  6  is a dark-colored fabric such as black color. 
     The power switch  18  is the operation unit for switching the turn ON and OFF of the power source of the printer  1 . 
     The carriage motor  22   d , the head  24 , the maintenance motor  33 , and the suction motor  36  are driven and controlled by the control unit  10  as described above. 
     Next, with reference to a flowchart of  FIG. 4 , the cleaning process of the printer  1  according to a first embodiment will be described. When the cleaning process starts, the printer  1  determines whether or not a mode is set in the white mode (S 11 ). In a case where it is determined that the mode is set in the white mode (S 11 : Yes), the printer  1  determines whether or not the suction of the white ink is performed (S 12 ). Here, it is determined whether or not the white ink is sucked by the ink suction operation performed after the initial activation or after the previous cleaning operation in the printer  1 , based on the cleaning information stored in the log storage area  13   a . The determination of the printing mode in S 11  and determination of the presence or absence of the suction of the white ink in S 12  are examples of determination as to whether or not the “suction of specific ink is performed” in the invention. 
     In a case where it is determined that the suction of the white ink is performed (S 12 : Yes), the printer  1  performs the suction of cleaning liquid with the first suction amount (S 13 ). Meanwhile, in a case where it is determined that the mode is not in the white mode (S 11 : No) and in a case where it is determined that the suction of the white ink is not performed (S 12 : No), the printer  1  performs the suction of cleaning liquid with the second suction amount smaller than the first suction amount (S 14 ). 
     The printer  1  adjusts the suction amount of the cleaning liquid by a time at which the suction motor  36  rotates. That is, the printer  1  causes a rotation time of the suction motor  36  in a case where the suction of cleaning liquid is performed with the first suction amount (S 13 ), to be lengthened more than that in a case where the suction of cleaning liquid is performed with the second suction amount (S 14 ). 
     As described above, according to the printer  1  of the present embodiment, when the cleaning operation is performed, depending on the color of ink sucked by the ink suction operation, since the suction unit  30  is controlled to vary the suction amount of the cleaning liquid, it is possible to clean the waste liquid flow path  34  with an amount of the cleaning liquid suitable for the color of ink. By doing this, it is possible to suppress the excessive use of the cleaning liquid, and it is possible to suppress the use amount of the cleaning liquid, as a result. 
     In addition, when the cleaning operation is performed, after the initial activation or after the previous cleaning operation in the printer  1 , the printer  1  can determine whether or not the suction of the white ink is performed, and can effectively suppress the use amount of the cleaning liquid by a simple determination process to vary the suction amount of the cleaning liquid according to the determined result. 
     In addition, since the printer  1  performs the ejecting of ink and the supply of the cleaning liquid with a single head  24 , it is possible to simplify a device configuration as compared with a case where performing in respective heads  24 . In addition, since the printer  1  performs the suction of ink and the suction of cleaning liquid by a common suction unit  30 , it is possible to simplify a device configuration as compared with a case where performing in respective suction units  30 . 
     Second Embodiment 
     Next, a second embodiment of the invention will be described. In the above-described first embodiment, the suction unit  30  is controlled to vary the suction amount of the cleaning liquid depending on the color of the ink sucked by the ink suction operation, but the suction unit  30  may be controlled to vary the suction amount of the cleaning liquid depending on the elapsed time from when the ink suction operation is performed. Hereinafter, only the differences from the first embodiment will be described. In the present embodiment, components similar to those of the first embodiment are denoted by the same reference numerals, and a detailed description thereof will be omitted. In addition, a modification example applied to the same configuration parts as the first embodiment is similarly applied to the present embodiment. 
       FIG. 5  is an explanatory diagram of a cleaning process according to the second embodiment. Similar to the first embodiment, in addition to the cleaning operation (hereinafter, it is referred to as “regular cleaning operation”) performed when the reference time elapses from when the ink suction operation is performed, the printer  1  of the invention performs the cleaning operation (hereinafter, it is referred to as “temporal cleaning operation”) performed when a trigger for starting the cleaning operation is generated before the reference time elapses. For example, the trigger for starting the cleaning operation is power OFF, a cleaning instruction operation, or the like. As a situation in which the power OFF is performed, it is considered that a case where the power switch  18  is operated by the user, a case where a power OFF instruction is received from the external device  100 , the power OFF is voluntarily performed in the printer  1 , and the like. Although the cleaning instruction operation is performed by using the operation panel  17 , in a case where a cleaning instruction is received from the external device  100 , the cleaning process assuming that the third trigger of starting the cleaning operation occurs, may be performed. 
     The printer  1  sets the suction amount of the cleaning liquid in the regular cleaning operation as the first suction amount. The first suction amount corresponds to the maximum amount of the cleaning liquid sucked in the cleaning operation. In addition, the first suction amount is an example of a “reference supply amount” of the invention. The printer  1  sets the suction amount of the cleaning liquid in a temporal cleaning operation as the third suction amount. The third suction amount is the suction amount smaller than the first suction amount. The third suction amount may be a predetermined suction amount, and may be the suction amount determined depending on the elapsed time from when the ink suction operation is performed. Hereinafter, the former is referred to as a “fixed value” and the latter is referred to as a “variable value”. 
     Here, with reference to  FIG. 6 , a method of determining the suction amount of the cleaning liquid in a case of the third suction amount as the variable value, will be described. A horizontal axis of a graph in  FIG. 6  indicates the elapsed time from when the ink suction operation is performed, and a vertical axis indicates the suction amount of the cleaning liquid. The elapsed time from when the ink suction operation is performed, is counted up by the timer  14 . As illustrated in  FIG. 6 , when determining the third suction amount, the printer  1  determines the third suction amount to increase the suction amount of the cleaning liquid as the elapsed time from when the ink suction operation is performed is lengthened. In  FIG. 6 , although the third suction amount increases in a curved manner with respect to the elapsed time, the third amount may be increased in a stepwise manner or may be linearly increased. 
     As described above, according to the printer  1  of the present embodiment, in the temporal cleaning operation performed before a reference period elapses, since the suction unit  30  is controlled to be the suction amount smaller than a reference suction amount that is the suction amount of the cleaning liquid in the regular cleaning operation performed when the reference time elapses, it is possible to suppress the use amount of the cleaning liquid as compared with a case of the regular cleaning operation. 
     In addition, in a case where the third suction amount that is the suction amount of the cleaning liquid, is set as the variable value in the temporal cleaning operation, since the suction amount of the cleaning liquid is determined depending on the elapsed time from when the ink suction operation is performed, it is possible to clean the waste liquid flow path  34  by the cleaning liquid of an amount suitable for the elapsed time. 
     Third Embodiment 
     Next, a third embodiment of the invention will be described. The third embodiment is a combination of the first embodiment and the second embodiment. Also, in the present embodiment, the same reference numerals are given to the same configuration parts as those in each of the above-described embodiments, and a detailed description thereof will be omitted. In addition, the modification example applied to the same configuration parts as those in each of the above embodiments are similarly applied to the present embodiment. 
     When the cleaning operation is performed, the printer  1  of the present embodiment determines the suction amount of the cleaning liquid depending on the color of the ink sucked by the ink suction operation and the elapsed time from when the ink suction operation is performed. In the present embodiment, a determining method of the third suction amount that is the suction amount of the cleaning liquid in the temporal cleaning operation is different when compared with the second embodiment. For example, in a case where the third suction amount is set as the fixed value in the printer  1 , the suction amount of the cleaning liquid of a case where the white ink is sucked, is greater than that of a case where the white ink is not sucked by the ink suction operation. Meanwhile, in a case where the third suction amount is set as the variable value, the printer  1  determines the suction amount of the cleaning liquid according to a graph illustrated in  FIG. 7 . 
       FIG. 7  is a graph indicating the suction amount of the cleaning liquid in a case where the third suction amount is set as the variable value. As illustrated in  FIG. 7 , in a case where the white ink is sucked, the third suction amount increases in a curved manner with respect to the elapsed time. Meanwhile, in a case where the white ink is not sucked, the third suction amount linearly increases with respect to the elapsed time. 
     As described above, according to the printer  1  of the present embodiment, when the cleaning operation is performed, since the suction unit  30  is controlled to vary the suction amount of the cleaning liquid, depending on the color of ink sucked by the ink suction operation and the elapsed time from when the ink suction operation is performed, it is possible to clean the waste liquid flow path  34  by the cleaning liquid of an amount suitable for the color of ink and the elapsed time. With this, by comparing the first embodiment and the second embodiment, it is possible to more effectively suppress the use amount of the cleaning liquid. 
     Fourth Embodiment 
     Next, a fourth embodiment of the invention will be described. In the fourth embodiment, depending on an environment temperature, the suction unit  30  is controlled to vary the suction amount of the cleaning liquid. Also, in the present embodiment, the same reference numerals are given to the same configuration parts as those in each of the above-described embodiments, and a detailed description thereof will be omitted. In addition, the modification example applied to the same configuration parts as those in each of the above embodiments are similarly applied to the present embodiment. 
     When the cleaning operation is performed, the printer  1  of the present embodiment determines the suction amount of the cleaning liquid depending on the color of ink sucked by the ink suction operation, the elapsed time from when the ink suction operation is performed, and the environment temperature detected by the temperature sensor  15  (see  FIG. 3 ). 
     Although the temperature sensor  15  is attached to the head  24  in the first embodiment, the temperature sensor  15  may be provided in the waste liquid flow path  34 , or may be attached to a housing of the printer  1 . In addition, the printer  1  may acquire the environment temperature from the external device  100 , or may acquire the environment temperature by user input through the operation panel  17 , instead of including the temperature sensor  15 . 
     In the printer  1  of the present embodiment, a determining method of the third suction amount that is the suction amount of the cleaning liquid in the temporal cleaning operation when compared with the third embodiment, is different. In a case where the third suction amount is determined, the printer  1  determines the suction amount of the cleaning liquid to be the suction amount of the cleaning liquid in a case where the environment temperature is high, greater than that of a case where the environment temperature is low. This is because the higher the environment temperature, the higher a drying speed of ink and the easier it is to solidify. 
     In addition, in a case where the third suction amount is set as the fixed value, the printer  1  determines the suction amount of the cleaning liquid according to which of a plurality of temperature ranges the environment temperature is included in. For example, the printer  1  may determine the suction amount of the cleaning liquid according to which of a first temperature range, a second temperature range, and a third temperature range the environment temperature is included. The first temperature range is a temperature range higher than the second temperature range, and the second temperature range is a temperature range higher than the third temperature range. The setting of each temperature range is not specifically limited. However, for example, it is considered that the first temperature range is “equal to or greater than 35° C.”, the second temperature range is “equal to or greater than 10° C. and less than 35° C.”, the third temperature range “less than 10° C.”, and the like. In this case, the printer  1  determines the third suction amount so as to be the suction amount in a case where the environment temperature is included in the first temperature range &gt; the suction amount in a case where the environment temperature is included in the second temperature range &gt; the suction amount in a case where the environment temperature is included in the third temperature range. 
     Meanwhile, in a case where the third suction amount is set as the variable value, the printer  1  determines the suction amount of the cleaning liquid according to a graph illustrated in  FIG. 8 . Also, in a case where the third suction amount is set as the variable value, the printer  1  determines the suction amount of the cleaning liquid according to which of three temperature ranges the environment temperature is included in.  FIG. 8  is a graph illustrating the suction amount of the cleaning liquid in a case where the third suction amount is set as the variable value. As illustrated in  FIG. 8 , in a case where the white ink is sucked and in a case where the white ink is not sucked, the printer  1  increases the difference in the suction amount of the cleaning liquid required in each temperature range as the elapsed time is lengthened. 
     As described above, according to the printer  1  of the present embodiment, when the cleaning operation is performed, since the suction unit  30  is controlled to vary the suction amount of the cleaning liquid depending on the color of ink sucked by the ink suction operation, the elapsed time from when the ink suction operation is performed, and the environment temperature, it is possible to clean the waste liquid flow path  34  by the cleaning liquid of the amount suitable for the color of ink, the elapsed time, and the environment temperature. With this, when compared with the first embodiment, the second embodiment, and the third embodiment, it is possible to more effectively suppress the use amount of the cleaning liquid. 
     So far, although the first to fourth embodiments are described, the following modification examples can for example be adopted regardless of these embodiments. 
     Modification Example 1 
     In the first embodiment, although the printer  1  controls the suction unit  30  so as to vary the suction amount of the cleaning liquid depending on the color of the ink sucked by the ink suction operation, the printer  1  may vary a suction amount of the cleaning liquid according to an element other than the color of ink. For example, even in the same ink color, the suction amount of the cleaning liquid may be varied depending on a composition of the ink. The composition of the ink can be distinguished by solvent, color materials, resins, additives, or the like of the ink which is a component of the ink. 
     Modification Example 2 
     In addition, in the first embodiment, although the printer  1  determines the printing mode and the color of ink sucked by the ink suction operation, and processes to vary a suction amount of the cleaning liquid according to the determined result, the suction amount of the cleaning liquid may be varied according to only the determined result of the printing mode. In this case, in a case where it is determined that a mode is the white mode, the printer  1  sucks the cleaning liquid with the first suction amount, and in a case where it is determined that the mode is a non-white mode, the cleaning liquid may be sucked with the second suction amount smaller than the first suction amount. In addition, as a further modification example, it may be processed the suction amount of the cleaning liquid to vary an amount according to the determined result of only the color of the ink sucked by the ink suction operation without performing the determination of the printing mode. 
     Modification Example 3 
     In the above-described second embodiment, although the printer  1  performs the cleaning process by the elapse of the reference time, the power OFF, and the cleaning instruction operation as the trigger, the cleaning process may be performed when the trigger of the cleaning process other than these is generated. In this case, the suction amount of the cleaning liquid may be the third suction amount and the third suction amount may be the fixed value or may be the variable value. In addition, the printer  1  may control the suction unit  30  to vary the third suction amount according to the generated trigger. For example, it is considered as the trigger of the cleaning process when the abnormal temperature of the head  24  is detected, when the ink is initially filled, or the like. 
     Modification Example 4 
     In the fourth embodiment, when the cleaning operation is performed, although the printer  1  processes to vary a suction amount of the cleaning liquid depending on the color of ink sucked by the ink suction operation, the elapsed time from when the ink suction operation is performed, and the environment temperature, the elapsed time may be not considered. That is, the printer  1  may determine the suction amount of the cleaning liquid depending on the color of ink sucked by the ink suction operation and the environment temperature. In this case, in each graph of  FIG. 8 , the printer  1  may suck the cleaning liquid with the suction amount when the elapsed time reaches the reference time. 
     Modification Example 5 
     In addition, in the fourth embodiment, the color of ink sucked by the ink suction operation may be not considered. That is, the printer  1  may determine the suction amount of the cleaning liquid depending on the elapsed time from when the ink suction operation is performed and the environment temperature. In this case, the printer  1  may determine the suction amount of the cleaning liquid according to a graph in a case where the white ink of  FIG. 8  is sucked. In addition, as a further modification example, the printer  1  may determine the suction amount of the cleaning liquid depending on only the environment temperature. In this case, in a graph of  FIG. 8 , the printer  1  may suck the cleaning liquid with the suction amount when the elapsed time reaches the reference time in a case where the white ink is sucked. 
     Modification Example 6 
     In each embodiment described above, although the printer  1  performs the cleaning process when the reference time elapses from when the first ink suction operation is performed after the initial activation or after the previous cleaning operation, this timing is not necessarily required. For example, the cleaning process may be performed when the reference time elapses from when the last ink suction operation is performed after the initial activation or after the previous cleaning operation in the printer  1 . That is, in a case where the ink suction operation starts while the timer  14  is counting, a count value of the timer  14  may be reset. 
     Modification Example 7 
     In each embodiment described above, although the plurality of ink nozzle rows  41  and one cleaning liquid nozzle row  42  are provided in the single head  24 , the ink nozzle row  41  and the cleaning liquid nozzle row  42  may be provided in different heads  24 . 
     Modification Example 8 
     In each embodiment described above, a downstream end of a supply flow path connected to the cleaning liquid storage unit, is connected between the suction cap  31  and the suction pump  35  of the waste liquid flow path  34 , and the suction unit  30  may suck the cleaning liquid from the cleaning liquid storage unit via the supply flow path instead of suctioning the cleaning liquid from the cleaning liquid nozzle row  42 . In addition, although the suction unit  30  functions as the “cleaning unit” of the invention by sucking the cleaning liquid from the cleaning liquid cartridge  27  via the waste liquid flow path  34 , the cleaning unit that performs the cleaning operation by which the cleaning liquid is supplied from the cleaning liquid storage unit to the waste liquid flow path  34 , may be provided in the printer  1  apart from the suction unit  30 . For example, a configuration in which the cleaning unit includes the cleaning liquid storage unit and a liquid feed unit that presses and feeds the cleaning liquid from the cleaning liquid storage unit to the waste liquid flow path  34  via the supply flow path, may be adopted. 
     Other Modification Example 
     A method for performing each process of the printer  1  shown in each of the above embodiments and modification examples, a program for executing each process of the printer  1  by the CPU  11 , and a computer-readable recording medium in which the program is recorded, are included in the scope of the invention. In addition, although the printer  1  is exemplified as an example of the liquid ejecting apparatus, the invention may be applied to an apparatus other than the printer  1  that ejects liquid to a medium. Besides, it is possible to appropriately vary the invention within a range not deviating from the gist of the invention. 
     This application claims priority under 35 U.S.C. § 119 to Japanese Patent Application No. 2018-015465, filed Jan. 31 2018. The entire disclosure of Japanese Patent Application No. 2018-015465 is hereby incorporated herein by reference.