Printing system

Abstract

To provide a printing system capable of suppressing abnormal images caused by ink flow without degrading image quality.SOLUTION: A printing system 300 comprises a printing device 1 and an applying device 400 that applies an adhesive to a transfer image. The printing device includes a discharge unit that discharges liquid onto a transfer substrate, a conveyance path along which the transfer substrate is conveyed, and heating means for heating the transfer substrate. The applying device includes an application unit that applies the adhesive and a conveyance path for the transfer substrate. The heating means includes a first heating section provided on an upstream side in a conveyance direction of the transfer substrate relative to the discharge unit, and a second heating section provided at a position facing the discharge unit via the conveyance path. An inclined section that is inclined relative to a horizontal direction is provided on a downstream side in the conveyance direction of the transfer substrate relative to the second heating section and in at least a part of the conveyance path of the transfer substrate. The discharge unit and the heating means are provided on an upstream side in the conveyance direction of the transfer substrate relative to the inclined section.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a printing system. [Background technology]

[0002] Printing systems using DTF (Direct To Film) printers are known. DTF printers form a transfer image by applying color ink to a transfer substrate such as film. For example, adhesive powder is applied to the transfer image, and the transfer image on the film is then transferred to a receiving material such as clothing. Heat and pressure are applied as needed during the transfer process.

[0003] Transfer film for transferring an image to a receiving material is produced, for example, as follows: The transfer substrate on which the image to be transferred has been formed is transported to a shaker, where adhesive powder is applied inside the shaker. In the shaker, excess adhesive powder is removed as needed, and the transfer film is completed by heat treatment (baking). By connecting a DTF printer to the shaker, it is possible to automate the process from forming the image to be transferred to producing the transfer film.

[0004] When applying ink to a transfer substrate such as a film to form an image for transfer, there is a problem that the ink flows on the film, resulting in an abnormal image. Prior art, although not related to the DTF system, has disclosed a method for controlling a heating means such as a heater.

[0005] Patent Document 1 discloses that the heater temperature is controlled in accordance with the number of passes in order to improve the stability of image quality. Patent Document 2 discloses that the degree of ink bleeding onto the printing paper is determined based on the results of printing a test pattern, and the printing paper is heated at a temperature according to the determined result during printing. According to Patent Document 2, this method is capable of preventing ink transfer stains during printing. Patent Document 3 discloses that in order to prevent insufficient drying, the heater temperature is controlled by calculating the maximum amount of ink that adheres per unit area. Summary of the Invention [Problem to be solved by the invention]

[0006] However, conventional techniques have not been able to solve the problem of ink flowing on the transfer substrate, resulting in abnormal images when forming a transfer image on the transfer substrate. The transport path of the transfer substrate often has sections that are inclined relative to the horizontal, causing ink to flow when the transfer substrate passes through the inclined sections. While reducing the overall amount of ink could be considered to prevent abnormal images caused by ink flow, doing so would result in a decrease in image quality.

[0007] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a printing system that can suppress abnormal images caused by ink flow without degrading image quality. [Means for solving the problem]

[0008] In order to solve the above problems, the printing system of the present invention comprises: a printing device for forming an image to be transferred on a transfer substrate; an adhesive applying device that applies adhesive to the image to be transferred formed by the printing device, the printing device includes a discharge unit that discharges a liquid onto the transfer substrate, a transport path along which the transfer substrate is transported, and a heating unit that heats the transfer substrate; the applying device has an applying section that applies the adhesive and a transport path along which the transfer substrate is transported, the heating means includes a first heating unit provided upstream of the discharge unit in the transport direction of the transfer substrate, and a second heating unit provided at a position opposite to the discharge unit across a transport path of the transfer substrate; an inclined portion inclined with respect to the horizontal direction is provided downstream of the second heating portion in the transport direction of the transfer substrate and in at least a part of the transport path of the transfer substrate, The discharge section and the heating means are provided upstream of the inclined section in the transport direction of the transfer substrate. It is characterized by: [Effects of the Invention]

[0009] According to the present invention, it is possible to provide a printing system that can suppress abnormal images caused by ink flow without degrading image quality. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 illustrates an example of a printing system. [Figure 2] FIG. 1 is a perspective view illustrating an example of a printing device. [Figure 3] FIG. 1 illustrates a configuration of an example of a printing apparatus. [Figure 4] FIG. 2 is a block diagram illustrating a hardware configuration of an example of a printing device. [Figure 5] FIG. 2 is a diagram illustrating a configuration of a heater in an example of a printing apparatus. [Figure 6] FIG. 1 is a diagram illustrating an example of a printing system, and is a diagram for explaining an example of an inclined portion. [Figure 7] FIG. 10 is another diagram illustrating an example of a printing device. [Figure 8] FIG. 10 is a diagram showing another example of a printing device, illustrating an example of a color measurement unit. [Figure 9] 10 is a flow chart showing an example of a setting correction mode. [Figure 10] 10 is a flow chart showing another example of the setting correction mode. [Figure 11] 10 is a flow chart showing another example of the setting correction mode. [Figure 12] 10 is a flow chart showing another example of the setting correction mode. [Figure 13] 10 is a flow chart showing another example of the setting correction mode. [Figure 14] 10 is a flow chart showing another example of the setting correction mode. [Figure 15] 10A and 10B are diagrams illustrating an example of adjusting the amount of ink adhesion for each region. [Figure 16] FIG. 10 is a diagram illustrating an example of the relationship between the amount of ink adhesion and density. DETAILED DESCRIPTION OF THE INVENTION

[0011] The printing system according to the present invention will be described below with reference to the drawings. Note that the present invention is not limited to the following embodiments, and other modifications, additions, corrections, deletions, and other changes can be made within the scope of what a person skilled in the art can conceive. Any modification that achieves the functions and effects of the present invention is within the scope of the present invention.

[0012] The printing system of the present invention comprises: a printing device for forming an image to be transferred on a transfer substrate; an adhesive applying device that applies adhesive to the image to be transferred formed by the printing device, the printing device includes a discharge unit that discharges a liquid onto the transfer substrate, a transport path along which the transfer substrate is transported, and a heating unit that heats the transfer substrate; the applying device has an applying section that applies the adhesive and a transport path along which the transfer substrate is transported, the heating means includes a first heating unit provided upstream of the discharge unit in the transport direction of the transfer substrate, and a second heating unit provided at a position opposite to the discharge unit across a transport path of the transfer substrate; an inclined portion inclined with respect to the horizontal direction is provided downstream of the second heating portion in the transport direction of the transfer substrate and in at least a part of the transport path of the transfer substrate, The discharge section and the heating means are provided upstream of the inclined section in the transport direction of the transfer substrate. It is characterized by:

[0013] In this invention, the layout of the printing device, application device, transport path, and heating means within the printing system is specified, and the layout is determined taking into consideration the position of the inclined portion of the transport path. As a result, according to this invention, it is possible to suppress abnormal images caused by ink flow without degrading image quality.

[0014] (First embodiment) FIG. 1 is a schematic diagram showing an example of a printing system according to this embodiment. The printing system 300 of this example includes a printing device 1 and an applying device 400. The printing device 1 forms an image to be transferred on a transfer substrate. In the figure, a medium P is shown as the transfer substrate. The applying device 400 applies adhesive to the image to be transferred formed by the printing device 1.

[0015] An image forming apparatus, a recording apparatus, a liquid ejection apparatus, an inkjet recording apparatus, a DTF (Direct To Film) printer, etc. can be used as the printing apparatus 1. In particular, a DTF printer is preferably used.

[0016] The application device 400 is provided downstream of the printing device 1 in the transport direction of the medium P (transfer substrate). The application device 400 may also be called a shaker or the like. The adhesive applied by the application device 400 can be selected as appropriate, and adhesives used in the DTF method, etc., can be used. The adhesive applied by the application device 400 is, for example, in powder form. The application device 400 may perform an operation to remove excess adhesive as necessary.

[0017] The transfer substrate to which the adhesive is applied by the application device 400 may be referred to as a transfer film or the like. A transfer process is performed on a transfer object using the transfer film. In the transfer process, the image to be transferred on the transfer film is transferred to the transfer object. An example of the transfer object is a T-shirt.

[0018] In the transfer process, for example, the transfer film is placed against the object to be transferred and heat-pressed with an iron or heat press, and the image to be transferred is transferred to the object to be transferred. The object to which the image to be transferred is sometimes referred to as a printed matter. The transfer process may be performed by the application device 400, but is preferably performed by using another device in order to simplify the device configuration of the application device 400.

[0019] The transfer substrate is not particularly limited and can be selected appropriately. For example, a film used as a transfer substrate in the DTF system can be used.

[0020] In the printing system 300 of this example, an inter-apparatus transport path 223 is provided between the printing device 1 and the applying device 400. The medium P is transported on the inter-apparatus transport path 223 between the printing device 1 and the applying device 400. The inter-apparatus transport path 223 is optional.

[0021] In many cases, the transport path between devices has an incline. In this embodiment, ink flow can be prevented even when the transport path has an incline, so that ink flow can be prevented even when the transport path between devices has an incline, and the occurrence of abnormal images can be suppressed.

[0022] Fig. 2 is a perspective view of the printing device 1. Fig. 3 is a diagram showing the configuration of the printing device 1. As shown in Figs. 2 and 3, the printing device 1 includes a device main body 10 and a support base 11 that supports the device main body 10.

[0023] The device body 10 has side plates 10A and 10B on the left and right sides. Guide members, a guide rod 12 and a guide stay 13, are hung between the side plates 10A and 10B. The printing device 1 also has a sub-metal guide 14. The guide rod 12 and the guide stay 13 slidably hold a carriage 15.

[0024] The main scanning mechanism 16 that moves and scans the carriage 15 includes a main scanning motor 17 arranged on one side in the main scanning direction, a drive pulley 18 that is rotationally driven by the main scanning motor 17, a driven pulley 19 arranged on the other side in the main scanning direction, and a timing belt 20 that is a pulling member that is wound around between the drive pulley 18 and the driven pulley 19. A tension spring applies tension to the driven pulley 19 in the outward direction (in the direction away from the drive pulley 18).

[0025] The carriage 15 moves in the direction of arrow A (main scanning direction) via a timing belt 20 that is driven to rotate by a main scanning motor 17. The carriage 15 also has an optical sensor 21 mounted thereon that detects the edge of the medium.

[0026] The carriage 15 is provided with a liquid ejection head 23 that ejects ink droplets of each color, such as black (K), yellow (Y), magenta (M), cyan (C), etc., according to the ink cartridge 22 that is installed.

[0027] The liquid ejection head 23 in this example is an example of an ejection unit, and includes, for example, heads 23a, 23b, and 23c. When the heads 23a, 23b, and 23c are not to be distinguished from one another, they may be referred to as the liquid ejection head 23. The liquid ejection head 23 has a nozzle row, and the nozzle row is arranged in the direction of arrow B (sub-scanning direction). Here, the sub-scanning direction is a direction perpendicular to the main scanning direction. The head 23 is mounted with the droplet ejection direction facing downward.

[0028] The liquid ejection heads 23 are grounded, for example, at positions offset from one another in the sub-scanning direction. The carriage 15 is equipped with sub-tanks to supply ink of each color to the liquid ejection heads 23. Other inks such as white ink and clear ink may also be supplied.

[0029] The printing device 1 has a cartridge loading unit 2 into which ink cartridges 22a, 22b, 22c, and 22d of each color are detachably mounted. The ink in the ink cartridges 22 is replenished and supplied to sub-tanks of the carriage 15 via supply tubes 24 of each color by a supply pump unit. The ink cartridges 22 may include a white ink cartridge, for example.

[0030] The printing device 1 includes a maintenance and recovery mechanism 3 in a non-printing area on one side in the main scanning direction of the carriage 15. The maintenance and recovery mechanism 3 maintains or recovers the state of the liquid ejection head 23.

[0031] The maintenance and recovery mechanism 3 includes a cap 31 for capping each nozzle surface of the liquid ejection head 23, and a wiping unit 32 for wiping the nozzle surface. In addition, a replaceable waste liquid tank is provided below the maintenance and recovery mechanism 3 for storing waste liquid generated by the maintenance and recovery operation.

[0032] A medium 41 is set in the paper feed means 40 as a transfer substrate, but media 41 of different width sizes can also be set.

[0033] Fig. 4 is a block diagram showing the hardware configuration of the printing device 1 according to this embodiment. As shown in Fig. 4, the printing device 1 includes a control unit 100, an operation panel 120, a sensor 130, a head driver 140, a main scanning motor 17, a sub-scanning motor 150, a carriage 15, a conveyor belt 160, a printer driver 170, a fan 180, and a heater 190.

[0034] The control unit 100 includes a CPU (Central Processing Unit) 101, a ROM (Read Only Memory) 102, and a RAM (Random Access Memory) 103.

[0035] The CPU 101 controls the entire printing device 1. The ROM 102 stores fixed data such as programs executed by the CPU 101. The RAM 103 temporarily stores image data and the like.

[0036] The control unit 100 includes a non-volatile RAM (NVRAM) 104 and an application specific integrated circuit (ASIC) 105.

[0037] The NVRAM 104 is a non-volatile memory that retains data even when power is cut off from the printing device 1. The ASIC 105 processes various types of signal processing and image processing such as rearrangement of image data, as well as input / output signals for controlling the entire printing device 1.

[0038] The control unit 100 has a print control unit 106. The carriage 15 transfers data for driving the liquid ejection head 23 to a head driver 140. The head driver 140 drives the liquid ejection head 23 provided on the carriage 15, causing the liquid ejection head 23 to eject ink.

[0039] The control unit 100 has a motor drive unit 107. The motor drive unit 107 drives a main scanning motor 17 and a sub-scanning motor 150. The main scanning motor 17 is driven to move and scan the carriage 15. The sub-scanning motor 150 is driven to move the conveyor belt 160 in a circular motion.

[0040] The control unit 100 has an I / O 108. The I / O 108 acquires information from a sensor 130 and extracts information used to control each part of the main body of the printing device 1. For example, the sensor 130 corresponds to a group of sensors such as a photo sensor, a temperature sensor, and an encoder sensor. The operation panel 120 inputs and outputs various types of information.

[0041] The control unit 100 has a host I / F 109. The host I / F 109 transmits and receives data and signals to and from the host side. Specifically, it transmits and receives data and signals from the printer driver 170 side of a host such as an information processing device such as a client PC, an image reading device, or an image capturing device via a cable or a network. The CPU 101 reads and analyzes the print data in the receive buffer included in the host I / F 109. Then, the ASIC 105 performs image processing, data sorting, and the like, and the image data is transferred from the print control unit 106 to the head driver 140.

[0042] The print control unit 106 transfers the image data as serial data, and outputs a transfer clock, latch signal, control signal, and the like required for transferring the image data to the head driver 140. Based on image data corresponding to one line of the liquid ejection head 23 that is input serially, the head driver 140 selectively provides drive pulses that constitute a drive waveform provided by the print control unit 106 to the pressure generating means of the liquid ejection head 23. This drives the liquid ejection head 23 and ejects liquid.

[0043] By selecting some or all of the pulses that make up the drive waveform, or some or all of the waveform elements that form the pulses, it is possible to print dots of different sizes, such as large droplets, medium droplets, and small droplets.

[0044] The control unit 100 has a fan control unit 110 and a heater control unit 111. The fan control unit 110 controls the output of the fan 180 so that air is blown at a predetermined temperature and volume. The heater control unit 111 controls the heater 190 so that the temperature is set to a predetermined value.

[0045] When driven, the fan 180 promotes air convection inside the printing device 1 and prevents excessive temperature rise due to stagnation of heated air at the top of the printing device 1. The fan 180 is connected to the fan control unit 110 of the control unit 100.

[0046] Fig. 5 is a diagram showing the configuration of the heater 190 of the printing apparatus 1. Note that in the example shown in Fig. 5, for simplicity, the illustration of some of the liquid ejection heads 23 is omitted.

[0047] 5, the heater 190 includes a preheater 190a, a print heater 190b, a print heater 190c, a postheater 190d, and a drying heater 190e. Each of these heaters 190 is provided with a temperature sensor such as a thermistor for temperature control.

[0048] The preheater 190a is a device that preheats the medium P to a temperature suitable for forming a liquid application surface. For example, the preheater 190a is an aluminum foil cord heater. The preheater 190a is attached to the back surface of the transport guide plate 191. The preheater 190a warms the medium P by heating the transport guide plate 191 itself.

[0049] The print heaters 190b and 190c are devices that heat the medium P when forming a liquid application surface on the medium P. For example, the print heaters 190b and 190c are cord heaters embedded in the platen 192, which is made of aluminum. The print heaters 190b and 190c heat the medium P by, for example, heating the platen 192 itself.

[0050] The post heater 190d and the drying heater 190e are devices that warm the medium P on which a liquid-coated surface has been formed in order to dry and fix the liquid, such as ink. For example, the post heater 190d is an aluminum foil cord heater. The post heater 190d is affixed to the back surface of the transport guide plate 191. The post heater 190d warms the medium P by heating the transport guide plate 191 itself. Also, for example, the drying heater 190e is an IR heater. The drying heater 190e dries the liquid-coated surface of the medium P by emitting IR radiation to the liquid-coated surface of the medium P. The drying heater 190e may be configured to include a fan and blow hot air onto the liquid-coated surface of the medium P.

[0051] Next, an example of the operation of the printing device 1 according to this embodiment will be described.

[0052] The CPU 101 reads and analyzes the print data in the reception buffer of the host I / F 109, and performs necessary image processing, data rearrangement processing, etc. in the ASIC 105 before transferring the data to the print control unit 106.

[0053] The print control unit 106 outputs image data and drive waveforms at the required timing to the head driver 140. In detail, the print control unit 106 generates a drive waveform consisting of one drive pulse or multiple drive pulses by D / A converting and amplifying the drive pulse pattern data stored in the ROM 102 and read by the CPU 101.

[0054] The image data for image output may be generated, for example, by storing font data in ROM 102, or by using a host-side printer driver to convert the image data into a bitmap and transfer it to the printing device 1.

[0055] The head driver 140 drives the liquid ejection head 23 by selectively applying drive pulses constituting a drive waveform provided by the print control unit 106 to the pressure generating means of the liquid ejection head 23 based on the input image data.

[0056] The heater 190 turns on when waking up from sleep mode and is controlled to a set temperature according to the medium P and mode. Once the heater 190 is up and running, the printing device 1 is ready to form a liquid-coated surface and begins initial operations for forming the liquid-coated surface. The drying heater 190e starts to turn on when formation of the liquid-coated surface begins.

[0057] The medium P is set on the preheater 190a side. The medium P is transported in the direction of arrow B by a transport belt 160 to which a driving force is applied from a sub-scanning motor 150, and a liquid-coated surface is formed by the ejection of liquid from the liquid ejection head 23. For example, the medium P may be a roll-type transfer substrate, or a flexible packaging medium such as PET, PVC, or OPP, or a sheet-like medium.

[0058] The medium P sent from the preheater 190a side is first preheated by the preheater 190a to a temperature suitable for forming a liquid application surface. The preheated medium P is then sent by the conveyor belt 160 to the image forming unit 193 where the liquid ejection head 23 is arranged.

[0059] In the image forming unit 193, the medium P is kept warm by print heaters 190b and 190c, and a liquid such as ink is ejected onto the medium P from the liquid ejection head 23 to form a liquid-coated surface. The heated air rises together with the steam, but to prevent the temperature of the upper part of the printing device 1 from rising excessively due to the air being stagnated, the fan 180 promotes air convection.

[0060] The medium P is transported in the sub-scanning direction, and the carriage 15 scans in a direction perpendicular to the direction of movement of the medium P, forming an image. When forming an image, the number of scans can be changed depending on the resolution of the image to be created, allowing for the formation of a high-resolution image.

[0061] The medium P on which the liquid-coated surface has been formed in the image forming unit 193 is sent further downstream.

[0062] The drying heater 190e preheats the filament to the target temperature before the medium P with the liquid-coated surface arrives. After that, when the medium P with the liquid-coated surface arrives, the drying heater 190e turns on in synchronization with the timing at which the sub-scanning stops. The timing at which the heater turns on can be changed depending on the type and mode of the medium P.

[0063] The post heater 190d and the drying heater 190e that blows hot air dry and fix the liquid such as ink on the medium P. After drying and fixing, the medium P is further wound up in a roll downstream.

[0064] The components of the printing device 1 in this embodiment will be described again. The ejection unit ejects a liquid onto the transfer substrate. An example of the ejection unit is a liquid ejection head 23. The printing apparatus 1 has a transport path along which the transfer substrate is transported. The transport path is formed, for example, by a platen 192. The transfer substrate is transported by transport means. Examples of the transport means include a sub-scanning motor 150 and a transport belt 160.

[0065] The heating means heats the transfer substrate. The heating means has a first heating section and a second heating section. The first heating section is provided upstream of the discharge section in the transfer substrate transport direction. An example of the first heating section is a preheater 190a. The second heating section is provided at a position opposite the discharge section across the transfer substrate transport path. An example of the second heating section is a print heater 190b or a print heater 190c. The second heating section may be, for example, one of the print heaters 190b and 190c.

[0066] Next, a detailed example of the printing system 300 will be described with reference to Fig. 6. Fig. 6 is a schematic diagram for explaining an example of a transport path in the printing system 300.

[0067] In the printing system 300 of this embodiment, an inclined section 210 inclined with respect to the horizontal direction is provided downstream of the second heating section (e.g., print heaters 190b, 190c) in the transport direction of the transfer substrate and in at least a part of the transport path of the transfer substrate. The ejection section (e.g., liquid ejection head 23) and the heating means are provided upstream of the inclined section 210 in the transport direction of the transfer substrate.

[0068] In FIG. 6 , inclined portions 210a, 210b, and 210c are illustrated as inclined portion 210, but this embodiment is not limited to this. Inclined portion 210 may be provided in three locations, for example, within printing apparatus 1, within application apparatus 400, and between printing apparatus 1 and application apparatus 400. Therefore, inclined portions 210a, 210b, and 210c are illustrated to explain these three locations. Inclined portion 210a is an inclined portion provided on the transport path within printing apparatus 1, inclined portion 210b is an inclined portion provided on the transport path within application apparatus 400, and inclined portion 210c is an inclined portion provided on the transport path between printing apparatus 1 and application apparatus 400. When inclined portions 210a, 210b, and 210c are described without distinction, they will be referred to as inclined portion 210.

[0069] The inclined portion 210 may be curved as shown in the figure, or may be linear or other shapes. There may be one or more inclined portion 210. The conveying path may be continuous and integrated, or discontinuous.

[0070] The inclined portion 210 may be provided for some purpose or may be provided without any purpose. For example, the inclined portion 210 may have a shape that decreases in height toward the downstream side in the transport direction of the transfer substrate, or may have a shape that increases in height toward the downstream side in the transport direction of the transfer substrate.

[0071] This embodiment is included as long as there is at least one inclined portion 210 in the transport path of the transfer substrate. The transport path may be inclined upstream of the point where the ejected liquid lands on the transfer substrate in the transport direction of the transfer substrate, but such an inclination on the upstream side is not included in the inclined portion 210. An example of such an inclination on the upstream side is a curved inclination at a position opposite the preheater 190a. The inclination of the transport path at the position opposite the preheater 190a does not affect the flow of ink because it is at a position before the liquid is ejected.

[0072] The transfer substrate may have sagging at the inclined portion 210. Furthermore, the transfer substrate may have sagging due to its own weight at the inclined portion 210. For example, the sagging is indicated by 210b in FIG.

[0073] In the printing device 1, the transfer substrate may be transported at a constant speed, or the transport speed may be varied or paused. Furthermore, the transport direction of the transfer substrate is not limited to a constant direction; the transfer substrate may be returned in the opposite direction and then transported again in the initial transport direction. Depending on the image to be formed on the transfer substrate and the type of ink used for image formation, the transport direction and transport speed of the transfer substrate in the printing device 1 may be changed, and transport and pause may be repeated. Therefore, it is preferable to provide slack in the transfer substrate at the inclined portion. By providing slack, the transport direction and transport speed can be changed without resistance. By providing slack, no load is placed on the transfer substrate, allowing an image to be formed on the transfer substrate without damage.

[0074] The conveying speed and conveying direction of the transfer substrate in the application device may be constant. Even when the conveying speed and conveying direction of the transfer substrate in the application device are constant, it is preferable that the transfer substrate has slack at the inclined portion, which makes it possible to avoid application of tension to the transfer substrate and to easily avoid damage to the transfer substrate.

[0075] As shown in the figure, the liquid ejection head 23, the preheater 190a, the print heater 190b, and the print heater 190c are provided upstream of the inclined portion 210 in the transport direction of the transfer substrate.

[0076] If the transfer substrate transport path has an incline (slope), the ejected liquid (e.g., ink) will flow on the transfer substrate as it passes through the inclined portion of the transport path. This causes differences in ink pinning depending on the location on the transfer substrate, resulting in an abnormal image. Pinning refers to the state in which the shape of a liquid, such as ink, ejected onto the transfer substrate becomes fixed and solid. Pinning controls the dot diameter.

[0077] In this embodiment, the ejection unit and heating means are provided upstream of the inclined portion in the transport direction of the transfer substrate, and the first and second heating units, which are the heating means, are arranged as described above. Heating is performed by the preheater 190a upstream of the liquid ejection head 23, and the print heaters 190b and 190c directly below the liquid ejection head 23, so that pinning of deposited dots can be performed before the ink flows at the inclined portion 210.

[0078] In this embodiment, it is possible to prevent abnormal images caused by ink flow without reducing the overall amount of ink (without reducing the total amount of ink). Therefore, in this embodiment, it is possible to prevent abnormal images caused by ink flow without degrading image quality. Furthermore, in this embodiment, it is possible to form high-quality images without being affected by the transport path.

[0079] In the printing system 300 of this example, an inter-apparatus transport path is provided between the printing device 1 and the application device 400, along which the transfer substrate is transported. The transport path along which the transfer substrate is transported in the printing device 1 is referred to as a first transport path 221, the transport path along which the transfer substrate is transported in the application device 400 is referred to as a second transport path 222, and the transport path (inter-apparatus transport path) along which the transfer substrate is transported between the printing device 1 and the application device 400 is referred to as a third transport path 223. The inclined portion 210 is provided in at least one selected from the first transport path 221, the second transport path 222, and the third transport path 223. Even in a system with such transport paths, ink can be prevented from flowing. Although the inclined portion 210 is not shown on the third transport path 223 in FIG. 2, the inclined portion 210 may be provided on the third transport path 223.

[0080] 6, the transport path in the area where the liquid ejection head 23 ejects the liquid is horizontal or approximately horizontal. This will be described again. It is preferable that the transport path of the transfer substrate in the printing device is horizontal or approximately horizontal in the transport direction of the transfer substrate, from the point where the liquid ejected by the ejection unit lands on the transfer substrate or from a point upstream of the point where the liquid lands to the downstream end of the second heating unit. This makes it possible to prevent the ink from flowing before it solidifies, and further suppress the occurrence of abnormal images.

[0081] 7 is another schematic diagram of the printing device 1 for explaining the horizontal section 220. The figure shows the horizontal section 220. As shown in the figure, the horizontal section 220 is a portion that is horizontal or approximately horizontal from the point where the liquid ejected by the liquid ejection head 23 lands on the medium P or a point upstream of the point where the liquid lands to the end of the print heater 190c.

[0082] The inclined portion 210a is located downstream of the second heating portion (e.g., print heaters 190b and 190c) on the medium P. The horizontal portion 220 is located at least up to the end of the print heater 190c. Therefore, the medium P is transported to the inclined portion 210a after the liquid ejection head 23 ejects liquid and the print heaters 190b and 190c heat the medium P. This makes it possible to further suppress ink flow.

[0083] Note that "up to the downstream end of the second heating unit" refers to the print heater that is more downstream of print heater 190b or print heater 190c. In other words, in this example, "up to the downstream end of the second heating unit" means up to the downstream end of print heater 190c.

[0084] The printing device 1 preferably has a post-heating unit downstream of the second heating unit (e.g., print heater 190c) in the transport direction of the transfer substrate. In this case, the inclined unit 210 is provided downstream of the post-heating unit in the transport direction of the transfer substrate. In this way, heating can be performed by the post-heating means before ink flow occurs, and ink flow can be prevented more reliably. Examples of the post-heating means include a post-heater 190d and a drying heater 190e shown in Fig. 5. Both the post-heater 190d and the drying heater 190e may be used, or either one of them may be used.

[0085] (Second embodiment) Next, another embodiment of the present invention will be described. Description of matters common to the above embodiment will be omitted. The printing system of this embodiment has a color measurement unit capable of measuring the dot area ratio or dot diameter.

[0086] The printing system of this embodiment has a colorimetric means capable of measuring dot area ratio or dot diameter, and has a setting correction mode that corrects the printing conditions of the printing device based on the measurement results of the colorimetric means, and the setting correction mode forms a detection pattern on a transfer substrate using the ejection unit, measures the detection pattern using the colorimetric means to obtain measurement results, and adjusts the heating temperature of the heating means based on the measurement results. By adjusting the heating temperature of the heating means in this way, it is possible to control the dot diameter within a desired range, thereby improving image quality.

[0087] The determination of the measurement results and the adjustment of the heating temperature can be selected appropriately. For example, the determination of the measurement results can be performed as follows. The printing system of this embodiment has a colorimetric means capable of measuring dot area ratio or dot diameter, and has a setting correction mode that corrects the printing conditions of the printing device based on the measurement results of the colorimetric means, and the setting correction mode forms a detection pattern on a transfer substrate using the ejection unit, measures the dot area ratio or dot diameter of the detection pattern using the colorimetric means, and adjusts the heating temperature of the heating means if the measured dot area ratio or dot diameter of the detection pattern is outside a predetermined range. By adjusting the heating temperature of the heating means, the dot diameter can be controlled within a desired range, thereby improving image quality.

[0088] FIG. 8 is a schematic perspective view of the main parts of a printing apparatus for explaining an example of this embodiment. The color measurement means is illustrated as a sensor 130. As illustrated, the color measurement means is preferably built into the carriage 15. In other words, it is preferable that the ejection unit and the color measurement means are mounted on the scanning carriage. In this case, the device can be easily configured and can be made smaller. In the drawing, A schematically indicates the scanning direction of the carriage 15, and B schematically indicates the transport direction of the medium P.

[0089] The liquid ejection head 23 forms a detection pattern 55, and a sensor 130, which is a color measurement means, measures the dot area ratio or dot diameter of the detection pattern 55. The dot area ratio is the ratio of the dot area to the unit area, expressed as a percentage.

[0090] The color measurement means can be appropriately selected, and a known means can be used. For example, a sensor with an imaging function can be used. The measurement results of the color measurement means are used in processing by the control unit 100, for example.

[0091] The detection pattern is not particularly limited and can be selected appropriately. For example, a solid image can be used as the detection pattern.

[0092] 9 is a flow chart for explaining an example of the setting correction mode in this embodiment, in which printing conditions are corrected based on the dot area ratio. In S1, a detection pattern is formed. In S2, the dot area ratio of the detection pattern is measured. The dot area ratio for each nozzle row is measured by a color measurement unit. In S3, it is determined whether the measured dot area ratio falls outside a predetermined range. If the answer is YES in S3, S4 is carried out. If the answer is NO in S3, S4 is not carried out and S5 is carried out.

[0093] In S4, the heating temperature of the heater is corrected. The heater whose heating temperature is corrected is the heating means described above, and for example, the heating temperature of the print heater 190b and the print heater 190c is adjusted.

[0094] The heating temperature is corrected, for example, as follows. If the dot area ratio of the detection pattern 55 is below a predetermined range, the dot diameter is considered to be smaller than the target, and the heating temperature of the heating means is set lower than the preset temperature. On the other hand, if the dot area ratio of the detection pattern 55 is above the predetermined range, the dot diameter is considered to be larger than the target, and the heating temperature of the heating means is set higher than the preset temperature. By making this correction, the dot diameter of the formed image can be made the target size, and image quality can be improved.

[0095] The heating temperature of the heating means may be corrected by correcting both the temperature of the first heating unit and the temperature of the second heating unit, or by correcting either one of them. Furthermore, the temperatures of the first heating unit and the second heating unit may be the same or different.

[0096] In S5, printing is performed. By adjusting the heating temperature of the heating means as in this embodiment, it is possible to improve image quality.

[0097] 10 is a flow chart for explaining another example of the setting correction mode in this embodiment, which is an example of correcting printing conditions based on dot diameter. In S1, a detection pattern is formed. In S6, the dot diameter of the detection pattern is measured by a colorimetric device. In S7, it is determined whether the measured dot diameter falls outside a predetermined range. If the answer is YES in S7, S8 is carried out. If the answer is NO in S7, S5 is carried out without carrying out S8.

[0098] In S8, the heating temperature of the heater is corrected in the same manner as in S4. The heater whose heating temperature is corrected is the heating means described above, and for example, the heating temperature of the print heater 190b and the print heater 190c is adjusted.

[0099] The heating temperature is corrected, for example, as follows. If the dot diameter of the detection pattern 55 falls below a predetermined range, the dot diameter is considered to be smaller than the target, and the heating temperature of the heating means is set lower than the preset temperature. On the other hand, if the dot diameter of the detection pattern 55 exceeds the predetermined range, the dot diameter is considered to be larger than the target, and the heating temperature of the heating means is set higher than the preset temperature. By making this correction, the dot diameter of the formed image can be made the target size, and image quality can be improved.

[0100] The predetermined ranges of dot area ratio and dot diameter used in the flow determination (S3, S7) may be stored in any storage means. The predetermined ranges are not particularly limited and can be selected appropriately. For example, a range of ±5% or ±10% of the specified value may be used.

[0101] If the answer is NO in S3 or S7, the heating temperature of the heating means is not corrected, and heating is performed at a preset temperature, for example, at the heating temperature set in the previous job.

[0102] The timing of executing the set correction mode can be selected as appropriate. For example, it is preferable to execute the set correction mode between jobs. In this case, it is possible to prevent a decrease in productivity and reduce the deterioration in image quality that occurs when jobs are continued. Note that a job refers to an operation for forming an image to be transferred on a transfer substrate. If the heating temperature is changed between jobs, a waiting time for temperature adjustment may occur between jobs.

[0103] (Third embodiment) Next, another embodiment of the present invention will be described, and a description of matters common to the above embodiment will be omitted.

[0104] The printing system of this embodiment has a colorimetric means capable of measuring dot area ratios, and has a setting correction mode that corrects the printing conditions of the printing device based on the measurement results of the colorimetric means, the ejection unit has one or more nozzle rows, and the setting correction mode measures the dot area ratios for each nozzle row in the detection pattern using the colorimetric means, calculates an average dot area ratio, and adjusts the heating temperature of the heating means if the average dot area ratio is outside a predetermined range.

[0105] By adjusting the heating temperature of the heating means in this way, it is possible to control the dot diameter within a desired range, thereby improving image quality. In this embodiment, for example, since the heating temperature is set within one job, the heating temperature can be adjusted more appropriately by making a judgment using the average value of the dot area ratio taking the nozzle row into consideration. In addition, it is possible to precisely control the image quality (density, etc.), thereby reducing image quality variations.

[0106] In addition, in the printing system of this embodiment, it is preferable that the setting correction mode calculates the difference from the average value of the dot area ratio for each nozzle row, and adjusts the amount of liquid ejected for nozzle rows where the difference falls outside a specified range. By adjusting the ejection amount of the ejection section for each nozzle row in this way, it is possible to reduce the amount of excess ink and suppress ink flow.

[0107] The color measurement means is not particularly limited, and the above-described sensor 130 or the like can be used. The detection pattern is also not particularly limited, and the above-described pattern can be used. The heating temperature can be corrected in the same manner as in the above embodiment.

[0108] 11 is a flow chart for explaining an example of the setting correction mode in this embodiment. Explanations of parts common to FIGS. 9 and 10 may be omitted. In S11, a detection pattern is formed. In S12, the dot area ratio for each nozzle row in the detection pattern is measured. The dot area ratio for each nozzle row in the detection pattern is measured using a colorimetric device. Note that the dot area ratio for each nozzle row can be easily determined by appropriately selecting the detection pattern. While not particularly limited, for example, the detection pattern may be one in which dots are spaced apart so that they do not overlap with adjacent dots.

[0109] In step S12, the average value of the dot area ratio is calculated using the dot area ratio for each nozzle row. The average value of the dot area ratio can be expressed as follows: Average dot area ratio = (total dot area ratio of nozzle rows) / number of nozzle rows

[0110] In S13, it is determined whether the average value of the dot area ratio falls outside a predetermined range. If the answer is YES in S13, S14 is carried out. If the answer is NO in S13, S14 is skipped and S15 is carried out.

[0111] In S12, the dot area ratio is measured by the color measurement means, and the average value of the dot area ratio is calculated by the control unit 100. The control unit 100 makes the determination in S13 and the adjustment in S14.

[0112] In S14, the heating temperature of the heater is corrected. The heater whose heating temperature is corrected is the heating means described above, and for example, the heating temperature of print heater 190b and print heater 190c is adjusted.

[0113] The heating temperature is corrected, for example, as follows. If the average value of the dot area ratio of the detection pattern 55 is below a predetermined range, the dot diameter is considered to be smaller than the target, and the heating temperature of the heating means is set lower than the preset temperature. On the other hand, if the average value of the dot area ratio of the detection pattern 55 is above the predetermined range, the dot diameter is considered to be larger than the target, and the heating temperature of the heating means is set higher than the preset temperature. By making such corrections, it is possible to improve image quality.

[0114] The heating temperature of the heating means may be corrected by correcting both the temperature of the first heating unit and the temperature of the second heating unit, or by correcting either one of them. Furthermore, the temperatures of the first heating unit and the second heating unit may be the same or different.

[0115] The reason why the average value of the dot area ratio is calculated and the determination is made based on this average value in steps S12 to S14 is that in this embodiment, the heating temperature is adjusted for the entire surface of the heaters (print heaters 190b and 190c). In this embodiment, the heating temperature is not set for each region, but is set within one job.

[0116] In S15, the difference from the average dot area ratio is calculated for each nozzle row. For example, the difference from the average dot area ratio for nozzle row A can be expressed as follows: Difference in nozzle row A = Dot area ratio of nozzle row A - Average dot area ratio

[0117] In S16, it is determined whether the difference from the average value calculated in S15 falls outside a predetermined range. This determination is made for each nozzle array. For nozzle arrays for which the result of S16 is YES, S17 is performed. For nozzle arrays for which the result of S16 is NO, S17 is skipped and S18 is performed.

[0118] In S17, the ejection amount is adjusted for each nozzle array. For nozzle arrays for which S16 returned a YES result, the ejection amount is adjusted because the nozzle array's dot area ratio is significantly different from the average value. For example, for a nozzle array for which S16 returned a YES result, if the difference from the average dot area ratio is outside a predetermined range and is smaller than the average dot area ratio, the ejection amount for that nozzle array is adjusted to increase. On the other hand, for a nozzle array for which S16 returned a YES result, if the difference from the average dot area ratio is outside a predetermined range and is larger than the average dot area ratio, the ejection amount for that nozzle array is adjusted to decrease.

[0119] In this embodiment, for example, if the dot area ratio of only a specific nozzle row (for example, a nozzle row ejecting ink of a specific color) is outside a specified range, the ejection amount of that nozzle row is adjusted.

[0120] In S 18, printing is performed. As in this embodiment, image quality can be improved by adjusting the heating temperature of the heating means and adjusting the ejection amount for each nozzle row.

[0121] The order of the processes can be changed as appropriate. For example, S13 and S14 may be performed after S17 and before S18.

[0122] The predetermined range of values ​​of the dot area ratio used in the flow determination (S13, S16) may be stored in any storage means. The predetermined range is not particularly limited and can be selected appropriately. For example, a range of ±5% or ±10% of the specified value may be used.

[0123] If S13 is NO, the heating temperature of the heating means is not corrected, and heating is performed at a preset temperature, for example. For example, heating is performed at the heating temperature set in the previous job. Also, for a nozzle row for which S16 is NO, the discharge amount is not corrected, and discharge is performed at a preset discharge amount, for example, discharge is performed at the discharge amount set in the previous job.

[0124] The adjustment of the amount of liquid ejected by the ejection unit can be selected as appropriate. If the difference from the average dot area rate is below a predetermined range, the dot diameter is considered to be smaller than the target, so the amount of liquid ejected by the ejection unit is increased from a preset amount. On the other hand, if the difference from the average dot area rate is above the predetermined range, the dot diameter is considered to be larger than the target, so the amount of liquid ejected by the ejection unit is decreased from a preset amount. By making such corrections, it is possible to improve image quality.

[0125] The method for adjusting the amount of liquid ejected by the ejection portion can be selected as appropriate. For example, a method of adjusting the drive waveform of the ejection unit can be used. The amount of liquid ejected by the ejection unit can be adjusted, for example, by correcting the voltage magnification of the drive waveform of the ejection unit. In this way, the amount of liquid ejected by the ejection unit can be adjusted with high precision.

[0126] When correcting the voltage magnification, the default voltage is corrected. For example, the voltage of the entire drive waveform is corrected to -X%. X is an arbitrary value that can be selected appropriately.

[0127] In addition to the above, the following advantages can be cited as examples of the advantages of adjusting the ejection amount by correcting the voltage magnification of the drive waveform of the ejection unit. When adjusting the ejection amount by correcting the voltage magnification of the drive waveform, the amount of liquid ejected can be adjusted for each nozzle. This makes it possible, for example, to set whether or not to perform adjustment for each ink color, and also to change the degree of adjustment for each ink color. Furthermore, when adjusting the ejection amount by correcting the voltage magnification of the drive waveform, it is also possible to adjust only specific areas within a job. An example of this case will be described in the following embodiment.

[0128] It is preferable to adjust the amount of liquid ejected by the ejection unit for each predetermined area. In other words, it is preferable to calculate the dot area ratio for each predetermined area and adjust the amount of liquid ejected for each predetermined area. By making adjustments for each predetermined area, it is possible to improve image quality. An example of adjusting the amount of ejection for each predetermined area will be described in the following embodiment.

[0129] The timing at which the setting correction mode is executed can be selected as appropriate, and similarly to the above embodiment, for example, it is preferable that the setting correction mode be executed between jobs.

[0130] (Fourth embodiment) Next, another embodiment of the present invention will be described, and a description of matters common to the above embodiment will be omitted.

[0131] The printing system of this embodiment has a colorimetric means capable of measuring dot diameter, and has a setting correction mode that corrects the printing conditions of the printing device based on the measurement results of the colorimetric means, the ejection unit has one or more nozzle rows, and the setting correction mode measures the dot diameter for each nozzle row in the detection pattern using the colorimetric means, calculates an average dot diameter, and adjusts the heating temperature of the heating means if the average dot diameter is outside a predetermined range.

[0132] By adjusting the heating temperature of the heating means in this way, it is possible to control the dot diameter within a desired range, thereby improving image quality. In this embodiment, for example, since the heating temperature is set within one job, the heating temperature can be adjusted more appropriately by making a judgment using the average dot diameter taking the nozzle row into consideration. In addition, it is possible to precisely control image quality (density, etc.), thereby suppressing image quality variations.

[0133] In addition, in the printing system of this embodiment, it is preferable that the setting correction mode calculates the difference from the average dot diameter for each nozzle row, and adjusts the amount of liquid ejected for nozzle rows where the difference falls outside a specified range. By adjusting the ejection amount of each ejection section for each nozzle row in this way, excess ink can be reduced and ink flow can be suppressed.

[0134] The color measurement means is not particularly limited, and the sensor 130 described above can be used. The detection pattern is also not particularly limited, and the pattern described above can be used. The correction of the heating temperature and the adjustment of the amount of liquid to be ejected can be performed in the same manner as in the above embodiment.

[0135] 12 is a flow chart for explaining an example of the setting correction mode in this embodiment. Explanations of parts common to FIGS. 9 to 11 may be omitted. In S21, a detection pattern is formed. In S22, the dot diameter for each nozzle row in the detection pattern is measured. The dot diameter for each nozzle row in the detection pattern is measured using a colorimetric device. Note that the dot diameter for each nozzle row can be easily determined by appropriately selecting the detection pattern. While not particularly limited, for example, the detection pattern may be one in which dots are spaced apart so that they do not overlap with adjacent dots.

[0136] In step S22, the average dot diameter is calculated using the dot diameters determined for each nozzle row. The average dot diameter can be expressed as follows: Average dot diameter = (total dot diameter of nozzle rows) / number of nozzle rows

[0137] In S23, it is determined whether the average dot diameter falls outside a predetermined range. If the answer is YES in S23, S24 is carried out. If the answer is NO in S23, S25 is carried out without carrying out S24.

[0138] In S22, the dot diameter is measured by the color measurement means, and the average dot diameter is calculated by the control unit 100. The control unit 100 makes the determination in S23 and the adjustment in S24.

[0139] In S24, the heating temperature of the heater is corrected. The heater whose heating temperature is corrected is the heating means described above, and for example, the heating temperature of the print heater 190b and the print heater 190c is adjusted.

[0140] The heating temperature is corrected, for example, as follows, in the same manner as in the second embodiment. If the average dot diameter of the detection pattern 55 falls below a predetermined range, the dot diameter is considered to be smaller than the target, and the heating temperature of the heating means is set lower than the preset temperature. On the other hand, if the average dot diameter of the detection pattern 55 exceeds the predetermined range, the dot diameter is considered to be larger than the target, and the heating temperature of the heating means is set higher than the preset temperature. By making such corrections, it is possible to improve image quality.

[0141] The heating temperature of the heating means may be corrected by correcting both the temperature of the first heating unit and the temperature of the second heating unit, or by correcting either one of them. Furthermore, the temperatures of the first heating unit and the second heating unit may be the same or different.

[0142] As in S22 to S24, the average dot diameter is calculated and a determination is made based on this average because, in this embodiment, the heating temperature is adjusted for the entire surface of the heaters (print heaters 190b and 190c). In this embodiment, the heating temperature is not set for each region, but is set within one job.

[0143] In S25, the difference in dot diameter from the average value is calculated for each nozzle row. For example, the difference in dot diameter from the average value for nozzle row A can be expressed as follows: Difference in nozzle row A = Dot diameter of nozzle row A - Average dot diameter

[0144] In S26, it is determined whether the difference from the average value calculated in S25 falls outside a predetermined range. This determination is made for each nozzle array. For nozzle arrays for which S26 returns YES, S27 is performed. For nozzle arrays for which S26 returns NO, S27 is skipped and S28 is performed.

[0145] In S27, the ejection volume is adjusted for each nozzle row. For nozzle rows for which S26 returned a YES result, the ejection volume is adjusted because the dot diameter is significantly different from the average value. For example, for a nozzle row for which S26 returned a YES result, if the difference from the average dot diameter is outside a predetermined range and is smaller than the average dot diameter, the ejection volume for that nozzle row is adjusted to increase. On the other hand, for a nozzle row for which S26 returned a YES result, if the difference from the average dot diameter is outside a predetermined range and is larger than the average dot diameter, the ejection volume for that nozzle row is adjusted to decrease.

[0146] In this embodiment, for example, if the dot diameter of only a specific nozzle row (for example, a nozzle row that ejects ink of a specific color) is outside the specified range, the ejection amount of that nozzle row is adjusted.

[0147] In S28, printing is performed. As in this embodiment, image quality can be improved by adjusting the heating temperature of the heating means and adjusting the ejection amount for each nozzle row.

[0148] The order of the processes can be changed as appropriate. For example, S23 and S24 may be performed after S27 and before S28.

[0149] The predetermined range of dot diameters used in determining the flow (S23, S26) may be stored in any storage device. The predetermined range is not particularly limited and can be selected appropriately. For example, it may be within ±5% or ±10% of the specified value.

[0150] If the result in S23 is NO, the heating temperature of the heating means is not corrected, and heating is performed at a preset temperature, for example. For example, heating is performed at the heating temperature set in the previous job. Also, for the nozzle row for which the result in S26 is NO, the discharge amount is not corrected, and discharge is performed at a preset discharge amount, for example, discharge is performed at the discharge amount set in the previous job.

[0151] The amount of liquid ejected by the ejection unit (for example, the liquid ejection head 23) can be adjusted appropriately, as in the second embodiment. If the difference from the average dot diameter falls below a predetermined range, the dot diameter is considered to be smaller than the target, and the amount of liquid ejected by the ejection unit is increased from a preset amount. On the other hand, if the difference from the average dot diameter exceeds the predetermined range, the dot diameter is considered to be larger than the target, and the amount of liquid ejected by the ejection unit is decreased from a preset amount. By making such corrections, it is possible to improve image quality.

[0152] As in the above embodiment, one method for adjusting the amount of liquid ejected by the ejection unit is, for example, adjusting the drive waveform of the ejection unit. The amount of liquid ejected by the ejection unit is adjusted, for example, by correcting the voltage multiplier for the drive waveform of the ejection unit. When the ejection amount is adjusted by correcting the voltage multiplier for the drive waveform, the advantages described in the above embodiment can be obtained.

[0153] As in the above embodiment, it is preferable to adjust the amount of liquid ejected by the ejection unit for each predetermined area. In other words, it is preferable to calculate the dot diameter for each predetermined area and adjust the amount of liquid for each predetermined area. By making adjustments for each predetermined area, it is possible to improve image quality. An example of adjusting the ejection amount for each predetermined area will be described in the following embodiment.

[0154] The timing at which the setting correction mode is executed can be selected as appropriate, and similarly to the above embodiment, for example, it is preferable that the setting correction mode be executed between jobs.

[0155] (Fifth embodiment) Next, another embodiment of the present invention will be described, and a description of matters common to the above embodiment will be omitted.

[0156] The printing system of this embodiment has a setting correction mode that corrects the printing conditions of the printing device, and the ejection unit has one or more nozzle rows.The setting correction mode calculates the amount of ink adhesion for each nozzle row based on image data of the print image, and if the amount of ink adhesion is greater than or equal to a predetermined specified value, adjusts the amount of liquid ejected by that nozzle row.

[0157] The amount of ink adhesion can be calculated, for example, by processing image data using a RIP (Raster Image Processor) to assign to each nozzle which type of droplet (type of droplet volume, color, etc.) to eject and at what timing, and by adding up the assigned values ​​for each nozzle row. By calculating the amount of ink adhesion in this way and correcting the printing conditions, it is possible to deal with cases where it is difficult to accurately measure the dot diameter, such as when dot distortion or satellites occur.

[0158] The amount of ink adhesion can be said to be the amount of ink ejected obtained by analyzing the image data of the detection pattern. The amount of ink adhesion can be calculated, for example, as follows: A profile is created at a stage prior to ejection to determine the relationship between color and amount of ink adhesion. Based on this, the amount of ink adhesion is determined from the image data.

[0159] The ink deposition amount is measured in units of %, for example, and in this case, it ranges from 0 to 100%. An ink deposition amount of 0% is a numerical representation of a state in which not a single droplet of the color ink is ejected from the ejection unit, for example, the nozzles of an inkjet head. An ink deposition amount of 100% is a numerical representation of a state in which the color ink is ejected from all nozzles of an inkjet head at the maximum ejection volume per droplet. The numerical value of the ink deposition amount is determined, for example, by processing the image data with a RIP (Raster Image Processor).

[0160] 13 is a flow chart for explaining an example of the setting correction mode in this embodiment. Explanations of parts common to FIGS. 9 to 12 may be omitted. In S31, a detection pattern is formed. In S32, the dot area ratio or dot diameter for each nozzle row in the detection pattern is measured. S32 to S34 can be performed in the same way as in the third or fourth embodiment, so a description thereof will be omitted here. In this example, too, if the determination result in S33 is YES, the heating temperature of the heating means is adjusted.

[0161] In S35, the amount of ink adhesion is calculated for each nozzle row based on the image data of the print image, the average amount of ink adhesion is calculated, and the difference from the average amount of ink adhesion for each nozzle row is calculated. The average amount of ink adhesion can be expressed as follows. For example, the difference from the average amount of ink adhesion for nozzle row A can be expressed as follows: Average amount of ink adhesion = (total amount of ink adhesion in nozzle rows) / number of nozzle rows Difference in nozzle row A = ink adhesion amount in nozzle row A - average ink adhesion amount

[0162] In S36, it is determined whether the difference from the average value calculated in S35 falls outside a predetermined range. This determination is made for each nozzle array. For nozzle arrays for which S36 returns YES, S37 is performed. For nozzle arrays for which S36 returns NO, S37 is skipped and S38 is performed.

[0163] In S37, the ejection amount is adjusted for each nozzle row. For nozzle rows for which S36 returned a YES result, the ejection amount is adjusted because the nozzle rows deviate significantly from the average ink deposition amount. For example, for a nozzle row for which S36 returned a YES result, if the difference from the average ink deposition amount is outside a predetermined range and is smaller than the average ink deposition amount, the ejection amount for that nozzle row is adjusted to increase. On the other hand, for a nozzle row for which S36 returned a YES result, if the difference from the average ink deposition amount is outside a predetermined range and is larger than the average ink deposition amount, the ejection amount for that nozzle row is adjusted to decrease.

[0164] In S38, printing is performed. As in this embodiment, image quality can be improved by adjusting the heating temperature of the heating means and the ejection amount for each nozzle row.

[0165] The order of the processes can be changed as appropriate. For example, S33 and S34 may be performed after S37 and before S38.

[0166] The predetermined range of ink deposition amount used in determining the flow (S33, S36) may be stored in any storage means. The predetermined range is not particularly limited and can be selected appropriately. For example, a range of ±5% or ±10% may be used.

[0167] If S33 is NO, the heating temperature of the heating means is not corrected, and heating is performed at a preset temperature, for example. For example, heating is performed at the heating temperature set in the previous job. Also, for a nozzle row for which S36 is NO, the discharge amount is not corrected, and discharge is performed at a preset discharge amount, for example, discharge is performed at the discharge amount set in the previous job.

[0168] The amount of liquid ejected by the ejection section (for example, the liquid ejection head 23) can be adjusted appropriately, as in the second and third embodiments. If the difference from the average amount of ink adhesion falls below a predetermined range, it is believed that the dot diameter will be smaller than the target, so the amount of liquid ejected by the ejection unit is increased from a preset amount. On the other hand, if the difference from the average amount of ink adhesion exceeds the predetermined range, it is believed that the dot diameter will be larger than the target, so the amount of liquid ejected by the ejection unit is decreased from a preset amount. By making such corrections, it is possible to improve image quality.

[0169] As in the above embodiment, one method for adjusting the amount of liquid ejected by the ejection unit is, for example, adjusting the drive waveform of the ejection unit. The amount of liquid ejected by the ejection unit is adjusted, for example, by correcting the voltage multiplier for the drive waveform of the ejection unit. When the ejection amount is adjusted by correcting the voltage multiplier for the drive waveform, the advantages described in the above embodiment can be obtained.

[0170] As in the above embodiment, it is preferable to adjust the amount of liquid ejected by the ejection unit for each predetermined area. In other words, it is preferable to calculate the ink adhesion amount for each predetermined area and adjust the amount of liquid for each predetermined area. By adjusting for each predetermined area, it is possible to improve image quality. This configuration will be further described in the following embodiment.

[0171] The timing at which the setting correction mode is executed can be selected as appropriate, and similarly to the above embodiment, for example, it is preferable that the setting correction mode be executed between jobs.

[0172] In the example shown in FIG. 13, the heating temperature is adjusted based on the detection pattern as in steps S31 to S34, but in this embodiment, steps S31 to S34 do not have to be performed.

[0173] (Sixth embodiment) Next, another embodiment of the present invention will be described, and a description of matters common to the above embodiment will be omitted. This embodiment describes an example in which the ejection amount is adjusted for each predetermined region in the above embodiment.

[0174] The printing system of this embodiment has a setting correction mode that corrects the printing conditions of the printing device, and the setting correction mode calculates the amount of ink adhesion for each specified area based on the image data of the print image, and if it is equal to or greater than a specified value, adjusts the amount of liquid ejected by the ejection unit in that area.

[0175] By calculating the ink deposition amount and correcting the printing conditions in this way, it is possible to deal with cases where accurate measurement of the dot diameter is difficult, such as dot distortion or the occurrence of satellites. Furthermore, by calculating the ink deposition amount for each specified region and adjusting the ejection amount, it is possible to suppress image variation. For example, deviations from the specified value may occur due to variations in the transfer substrate. In this embodiment, it is possible to suppress image variation caused by such factors.

[0176] In addition, in the printing system of this embodiment, it is preferable that the set correction mode sets the amount of liquid ejected by the ejection section in an area where the calculated ink adhesion amount is equal to or greater than a predetermined value to the predetermined value. In areas where the amount of ink adhesion calculated in this manner exceeds a predetermined value, the amount of liquid ejected is reduced, i.e., set to the predetermined value, thereby reducing excess ink and suppressing ink flow.

[0177] 14 is a flow chart for explaining an example of the setting correction mode in this embodiment. Explanations of parts common to FIGS. 9 to 13 may be omitted. Steps S41 to S47 can be performed in the same manner as in the above embodiment, and therefore will not be described here. In this example, if the determination result in step S43 is YES, the heating temperature of the heating means is adjusted, and if the determination result in step S46 is YES for a nozzle row, the ejection amount is adjusted for each nozzle row.

[0178] In S48, the amount of ink adhesion is calculated for each unit area (which may also be called a predetermined area, an area, etc.) in the job based on the image data of the print image.

[0179] In S49, it is determined whether the amount of ink adhesion in the area calculated in S48 is equal to or greater than a specified value. This determination is made for each area. For areas where S49 returns YES, S50 is performed. For areas where S49 returns NO, S50 is skipped and S51 is performed.

[0180] In S50, an adjustment is made to reduce the amount of ink adhesion to a specified value in the area where S49 returned a YES result. If the amount of ink adhesion is greater than the specified value, excessive ink will adhere to the transfer substrate, so the amount of ink adhesion in that area is reduced to the specified value.

[0181] In S51, printing is performed. As in this embodiment, by adjusting the heating temperature of the heating means, adjusting the ejection amount for each nozzle row, and further adjusting the ejection amount for each region, it is possible to further improve image quality.

[0182] This embodiment will be further described with reference to FIGS. Figure 15 is a diagram showing a schematic example of an entire print area 60 in one job. Figure 15(A) is a diagram for explaining an image of the entire print area 60, and Figure 15(B) is a diagram for explaining an example of an area in (A) where the amount of ink adhesion is adjusted.

[0183] The area within a job where the amount of ink deposition is adjusted can be selected as appropriate, and examples include the areas corresponding to the figures indicated by reference numerals 61 and 62 in FIG. 15(A). In FIG. 15(B), the areas where the amount of ink deposition is adjusted are indicated by reference numerals 63 and 64. In this way, the amount of ink deposition can be adjusted for each area within a job. As explained in the above embodiment, the amount of ink deposition can be adjusted by finely adjusting the voltage magnification of the drive waveform, for example.

[0184] For example, if the colors of the figures 61 and 62 shown in FIG. 15(A) are dark, adjustment is made to reduce the amount of ink adhesion only in the areas indicated by the hatched symbols 63 and 64 in FIG. 15(B).

[0185] FIG. 16 is a diagram illustrating an example of the relationship between ink deposition amount and density. FIG. 16 also illustrates an example of the specified value in S49 of the above flow, and an example of ink deposition amount adjustment in S50. As shown in the diagram, in this embodiment, for example, when the ink deposition amount is equal to or greater than a certain value (a in the diagram), the density becomes constant, and any ink deposition amount greater than that (from a to b) becomes excessive ink. Therefore, only in areas where the ink deposition amount is equal to or greater than a specified value (e.g., a), adjustment is made to reduce the ink deposition amount to the specified value (e.g., a). For example, if the ink deposition amount in a certain area is b, b is greater than the specified value (e.g., a), and therefore adjustment is made to reduce the ink deposition amount in that area from b to a.

[0186] By making such adjustments, it is possible to reduce excess ink and further suppress ink flow without changing the image quality (density).

[0187] In the present invention, by using a method such as finely switching the voltage magnification of the drive waveform, it is possible to adjust the ink deposition amount not only for all areas within a job but also for specific areas within the job, and it is also possible to adjust the ink deposition amount for each nozzle (for example, ink color). When adjusting the ejection amount by correcting the voltage magnification for the drive waveform, it becomes easier to adjust only specific areas within a job, as in this embodiment.

[0188] In the example shown in FIG. 14, the heating temperature and the ejection amount are adjusted based on the detection pattern as in S41 to S47, but in this embodiment, S41 to S47 do not have to be performed.

[0189] For example, aspects of the present invention are as follows. <1> a printing device for forming an image to be transferred on a transfer substrate; an adhesive applying device that applies adhesive to the image to be transferred formed by the printing device, the printing device includes a discharge unit that discharges a liquid onto the transfer substrate, a transport path along which the transfer substrate is transported, and a heating unit that heats the transfer substrate; the applying device has an applying section that applies the adhesive and a transport path along which the transfer substrate is transported, the heating means includes a first heating unit provided upstream of the discharge unit in the transport direction of the transfer substrate, and a second heating unit provided at a position opposite to the discharge unit across a transport path of the transfer substrate; an inclined portion inclined with respect to the horizontal direction is provided downstream of the second heating portion in the transport direction of the transfer substrate and in at least a part of the transport path of the transfer substrate, The discharge section and the heating means are provided upstream of the inclined section in the transport direction of the transfer substrate. A printing system characterized by: <2> a transport path along which the transfer substrate is transported is provided between the printing device and the application device; When a transport path along which the transfer substrate is transported in the printing device is defined as a first transport path, a transport path along which the transfer substrate is transported in the application device is defined as a second transport path, and a transport path along which the transfer substrate is transported between the printing device and the application device is defined as a third transport path, The inclined portion is provided on at least one selected from the first conveying path, the second conveying path, and the third conveying path. Characterized by <1> 2. A printing system according to claim 1 . <3> The transport path of the transfer substrate in the printing device is horizontal or approximately horizontal in the transport direction of the transfer substrate from a position where the liquid ejected by the ejection unit lands on the transfer substrate or from a position upstream of the position where the liquid lands to an end position on the downstream side of the second heating unit. Characterized by <1> or <2> 2. A printing system according to claim 1 . <4> The transfer substrate has slack in the inclined portion. Characterized by <1> from <3> 10. The printing system according to claim 9, wherein: <5> The transfer substrate has slack in the inclined portion due to its own weight. Characterized by <1> from <4> 10. The printing system according to claim 9, wherein: <6> A colorimetric means capable of measuring the dot area ratio or the dot diameter is provided, a setting correction mode for correcting the printing conditions of the printing device based on the measurement results of the color measurement means; In the setting correction mode, a detection pattern is formed on a transfer substrate by the ejection unit, the detection pattern is measured by the color measurement unit to obtain a measurement result, and the heating temperature of the heating unit is adjusted based on the measurement result. Characterized by <1> from <5> 10. The printing system according to claim 9, wherein: <7> A colorimetric means capable of measuring the dot area ratio or the dot diameter is provided, a setting correction mode for correcting the printing conditions of the printing device based on the measurement results of the color measurement means; The setting correction mode is a mode in which a detection pattern is formed on a transfer substrate by the ejection unit, a dot area ratio or a dot diameter of the detection pattern is measured by the color measurement unit, and if the measured dot area ratio or the dot diameter of the detection pattern is outside a predetermined range, a heating temperature of the heating unit is adjusted. Characterized by <1> from <6> 10. The printing system according to claim 9, wherein: <8> having a colorimetric means capable of measuring a dot area ratio, a setting correction mode for correcting the printing conditions of the printing device based on the measurement results of the color measurement means; the ejection unit has one or more nozzle rows, In the setting correction mode, the color measurement unit measures the dot area ratio for each nozzle row in the detection pattern, calculates an average value of the dot area ratio, and adjusts the heating temperature of the heating unit if the average value of the dot area ratio is outside a predetermined range. Characterized by <1> from <7> 10. The printing system according to claim 9, wherein: <9> The setting correction mode calculates the difference from the average value of the dot area ratio for each of the nozzle rows, and adjusts the amount of liquid to be ejected for a nozzle row where the difference falls outside a predetermined range. Characterized by <8> 2. A printing system according to claim 1 . <10> having a color measurement means capable of measuring the dot diameter, a setting correction mode for correcting the printing conditions of the printing device based on the measurement results of the color measurement means; the ejection unit has one or more nozzle rows, In the setting correction mode, the color measurement unit measures the dot diameter for each nozzle row in the detection pattern, calculates an average value of the dot diameter, and adjusts the heating temperature of the heating unit if the average value of the dot diameter is outside a predetermined range. Characterized by <1> from <9> 10. The printing system according to claim 9, wherein: <11> The setting correction mode calculates the difference from the average dot diameter for each nozzle row, and adjusts the amount of liquid to be ejected for a nozzle row where the difference falls outside a predetermined range. Characterized by <10> 2. A printing system according to claim 1 . <12> a setting correction mode for correcting the printing conditions of the printing device; the ejection unit has one or more nozzle rows, The setting correction mode calculates the amount of ink adhesion for each nozzle row based on image data of a print image, and adjusts the amount of liquid ejected by that nozzle row when the amount of ink adhesion is equal to or greater than a predetermined value. Characterized by <1> from <11> 10. The printing system according to claim 9, wherein: <13> a setting correction mode for correcting the printing conditions of the printing device; The set correction mode calculates the amount of ink adhesion for each predetermined area based on image data of a print image, and if the amount of ink adhesion is equal to or greater than a predetermined value, adjusts the amount of liquid ejected by the ejection unit in that area. Characterized by <1> from <12> 10. The printing system according to claim 9, wherein: <14> The setting correction mode sets the amount of liquid ejected by the ejection unit in a region where the calculated amount of ink adhesion is equal to or greater than a predetermined value to the predetermined value. Characterized by <13> 2. A printing system according to claim 1 . <15> The amount of liquid ejected by the ejection unit is adjusted by correcting the voltage magnification of the drive waveform of the ejection unit. Characterized by <9> , <11> , <12> or <13> 2. A printing system according to claim 1 . <16> The ejection unit and the color measurement unit are mounted on a scanning carriage. Characterized by <6> from <10> 10. The printing system according to claim 9, wherein: <17> the printing device has a post-heating unit downstream of the second heating unit in a transport direction of the transfer substrate, The inclined portion is provided downstream of the post-heating unit in the transport direction of the transfer substrate. Characterized by <1> from <16> 10. The printing system according to claim 9, wherein: [Explanation of symbols]

[0190] 1 Printing device 15 Carriage 23 Liquid ejection head 55 Detection Pattern 100 control section 130 sensors 190a Preheater 190b, 190c Print heater 200 Transport Route 210 Slope 300 Printing System 400 Applicator [Prior art documents] [Patent documents]

[0191] [Patent Document 1] Patent No. 6146893 [Patent Document 2] Japanese Patent Application Laid-Open No. 2014-104623 [Patent Document 3] Japanese Patent Publication No. 2022-80018

Claims

1. a printing device for forming an image to be transferred on a transfer substrate; an adhesive applying device that applies adhesive to the image to be transferred formed by the printing device, the printing device includes a discharge unit that discharges a liquid onto the transfer substrate, a transport path along which the transfer substrate is transported, and a heating unit that heats the transfer substrate; the applying device has an applying section that applies the adhesive and a transport path along which the transfer substrate is transported, the heating unit includes a first heating unit provided upstream of the discharge unit in the transport direction of the transfer substrate, and a second heating unit provided at a position opposite to the discharge unit across a transport path of the transfer substrate, an inclined portion inclined with respect to a horizontal direction is provided downstream of the second heating portion in the transport direction of the transfer substrate and in at least a part of the transport path of the transfer substrate, The discharge section and the heating means are provided upstream of the inclined section in the transport direction of the transfer substrate. A printing system characterized by:

2. a transport path along which the transfer substrate is transported is provided between the printing device and the application device; When a transport path along which the transfer substrate is transported in the printing device is defined as a first transport path, a transport path along which the transfer substrate is transported in the application device is defined as a second transport path, and a transport path along which the transfer substrate is transported between the printing device and the application device is defined as a third transport path, The inclined portion is provided on at least one selected from the first conveying path, the second conveying path, and the third conveying path.

2. The printing system according to claim 1.

3. A transport path of the transfer substrate in the printing device is horizontal or approximately horizontal in a transport direction of the transfer substrate from a position where the liquid ejected by the ejection unit lands on the transfer substrate or from a position upstream of the position where the liquid lands to an end position on the downstream side of the second heating unit.

2. The printing system according to claim 1.

4. The transfer substrate has slack in the inclined portion.

2. The printing system according to claim 1.

5. The transfer substrate has slack in the inclined portion due to its own weight.

2. The printing system according to claim 1.

6. A colorimetric means capable of measuring the dot area ratio or the dot diameter is provided, a setting correction mode for correcting the printing conditions of the printing device based on the measurement results of the color measurement means; In the setting correction mode, a detection pattern is formed on a transfer substrate by the ejection unit, the detection pattern is measured by the color measurement unit to obtain a measurement result, and the heating temperature of the heating unit is adjusted based on the measurement result.

2. The printing system according to claim 1.

7. A colorimetric means capable of measuring the dot area ratio or the dot diameter is provided, a setting correction mode for correcting the printing conditions of the printing device based on the measurement results of the color measurement means; The setting correction mode is a mode in which a detection pattern is formed on a transfer substrate by the ejection unit, a dot area ratio or a dot diameter of the detection pattern is measured by the color measurement unit, and if the measured dot area ratio or the dot diameter of the detection pattern is outside a predetermined range, a heating temperature of the heating unit is adjusted.

2. The printing system according to claim 1.

8. having a colorimetric means capable of measuring a dot area ratio, a setting correction mode for correcting the printing conditions of the printing device based on the measurement results of the color measurement means; the ejection unit has one or more nozzle rows, In the setting correction mode, the color measurement unit measures the dot area ratio for each nozzle row in the detection pattern, calculates an average value of the dot area ratio, and adjusts the heating temperature of the heating unit if the average value of the dot area ratio is outside a predetermined range.

2. The printing system according to claim 1.

9. The setting correction mode calculates the difference from the average value of the dot area ratio for each of the nozzle rows, and adjusts the amount of liquid to be ejected for a nozzle row where the difference falls outside a predetermined range.

9. The printing system according to claim 8.

10. having a color measurement means capable of measuring the dot diameter, a setting correction mode for correcting the printing conditions of the printing device based on the measurement results of the color measurement means; the ejection unit has one or more nozzle rows, In the setting correction mode, the color measurement unit measures the dot diameter for each nozzle row in the detection pattern, calculates an average value of the dot diameter, and adjusts the heating temperature of the heating unit if the average value of the dot diameter is outside a predetermined range.

2. The printing system according to claim 1.

11. The setting correction mode calculates the difference from the average dot diameter for each nozzle row, and adjusts the amount of liquid to be ejected for a nozzle row where the difference falls outside a predetermined range.

11. The printing system according to claim 10.

12. a setting correction mode for correcting the printing conditions of the printing device; the ejection unit has one or more nozzle rows, The setting correction mode calculates the amount of ink adhesion for each nozzle row based on image data of a print image, and adjusts the amount of liquid ejected by that nozzle row when the amount of ink adhesion is equal to or greater than a predetermined value.

2. The printing system according to claim 1.

13. a setting correction mode for correcting the printing conditions of the printing device; The set correction mode calculates the amount of ink adhesion for each predetermined area based on image data of a print image, and if the amount of ink adhesion is equal to or greater than a predetermined value, adjusts the amount of liquid ejected by the ejection unit in that area.

2. The printing system according to claim 1.

14. The setting correction mode sets the amount of liquid ejected by the ejection unit in a region where the calculated amount of ink adhesion is equal to or greater than a predetermined value to the predetermined value.

14. The printing system according to claim 13.

15. The amount of liquid ejected by the ejection unit is adjusted by correcting the voltage magnification of the drive waveform of the ejection unit.

14. A printing system according to claim 9, 11, 12 or 13.

16. The ejection unit and the color measurement unit are mounted on a scanning carriage.

11. The printing system according to claim 6, wherein:

17. the printing device has a post-heating unit located downstream of the second heating unit in a transport direction of the transfer substrate, The inclined portion is provided downstream of the post-heating unit in the transport direction of the transfer substrate.

2. The printing system according to claim 1.

Images