Printing apparatus

Abstract

To make it easier to treat the inkjet heads used for printing on can bodies. [Solution] When processing is performed on the inkjet head 260, the mandrel 230M stops at a location different from the mandrel stopping points 801 to 816. The mandrel 230M stops with the gap 78 between the mandrels 230M positioned opposite the inkjet head 260. In addition, when processing is performed on the inkjet head 260, the rotation of the transmission member 50 is also stopped.

Description

Technical Field

[0001] The present invention relates to a printing apparatus.

Background Art

[0002] Patent Document 1 discloses a configuration in which a cleaning function for a nozzle surface by spraying a cleaning liquid is added by using a cap for sucking bubbles inside the nozzle together with ink.

Prior Art Document

Patent Document

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In a printing apparatus that performs printing on a can body, printing may be performed using an inkjet head. When using an inkjet head, treatments for the inkjet head such as cleaning and inspection of the inkjet head are required. An object of the present invention is to make it easier to perform treatments on an inkjet head used for printing on a can body.

Means for Solving the Problems

[0005] The printing apparatus to which the present invention is applied includes a plurality of can body support members that support a can body and perform circulating movement, an inkjet head that discharges ink onto the can body supported by the can body support members, and control means for stopping the plurality of can body support members in a state where a gap between two adjacent can body support members is located at a position facing the inkjet head.

[0006] Here, multiple sets of two adjacent can support members are provided, with a gap provided between each set, and multiple inkjet heads are provided, arranged in the direction of movement of the can support members, and when the movement of the multiple can support members is stopped, the gap is located at the opposing location of each of the multiple inkjet heads. Furthermore, the cleaning device for cleaning the inkjet head may further include a cleaning device that moves into the gap located opposite the inkjet head and cleans the inkjet head. Furthermore, when the multiple can body support members are circulating, the cleaning device may be positioned outside the gap. Furthermore, multiple sets of the adjacent can support members are provided, with a gap provided between each set, and multiple inkjet heads are provided, arranged in the direction of movement of the can support members, and when the movement of the multiple can support members is stopped, the gap is located at the opposing location of each of the multiple inkjet heads, and the cleaning device is provided in a manner corresponding to each of the multiple inkjet heads, and when the movement of the multiple can support members is stopped, each of the cleaning devices may move into the gap located at the opposing location of the corresponding inkjet head. Furthermore, the device support portion for supporting the cleaning device for cleaning the inkjet head may further include a device support portion that is movably provided and capable of moving toward and toward the gap located opposite the inkjet head. Furthermore, the device support portion may be provided so as to be movable along the longitudinal direction of the inkjet head. Furthermore, the plurality of can support members may pass below the inkjet head, and the device support portion may be located below the inkjet head and be provided to be movable in the vertical direction. Furthermore, the system may further include a cleaning device that is movably mounted and performs cleaning of the inkjet head, and which can be moved into the gap located opposite the inkjet head. Furthermore, when the movement of the plurality of can body support members is stopped, the gap located at the opposing point is located on the movement path of the plurality of can body support members, and the cleaning device may be provided so as to be able to move into the gap, as well as to be able to move to a location off the movement path of the plurality of can body support members. Furthermore, the inkjet head may be arranged in a direction intersecting the movement direction of the plurality of can support members, and the cleaning device may be provided so as to be able to move along the longitudinal direction of the inkjet head and to be able to be retracted to the side of the movement path of the plurality of can support members. Furthermore, the plurality of can support members may move below the inkjet head, and the cleaning device may be provided to be movable in the vertical direction and to be retracted below the movement path of the plurality of can support members.

[0007] From another perspective, the printing apparatus to which the present invention is applied is a printing apparatus comprising: a plurality of can support members that are provided to be able to move in a circulating manner and support a can body; and an inkjet head that is provided to be able to move in the direction of movement of the can support members and in the opposite direction to said direction of movement, and for ejecting ink onto the can body supported by the can support members. Furthermore, the system may also include control means for moving the inkjet head to an opposing location in the gap between two adjacent can support members. [Effects of the Invention]

[0008] According to the present invention, it is possible to make it easier to treat the inkjet head used for printing on can bodies. [Brief explanation of the drawing]

[0009] [Figure 1] It is a view of the printing apparatus when viewed from above. [Figure 2] It is a cross-sectional view of the printing apparatus taken along line II-II of FIG. 1. [Figure 3] It is a view showing the hardware configuration of the control unit. [Figure 4] It is a view of the inspection mechanism when viewed from the direction of arrow IV in FIG. 1. [Figure 5] It is a view showing the state of the printing apparatus when a treatment is performed on the inkjet head. [Figure 6] It is a view showing another configuration example of the printing apparatus. [Figure 7] It is a view showing another configuration example of the printing apparatus. [Figure 8] It is a view showing another configuration example of the printing apparatus. [Figure 9] It is a cross-sectional view of the printing apparatus taken along line IX-IX of FIG. 8. [Figure 10] It is a view showing another configuration example of the printing apparatus. [Figure 11] It is a view showing another configuration example of the printing apparatus. [Figure 12] It is a view showing a printing apparatus in which a mandrel circulates and moves around a rotation center along a direction intersecting the vertical direction.

Embodiments for Carrying Out the Invention

[0010] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a view of the printing apparatus 100 according to the present embodiment when viewed from above. FIG. 2 is a cross-sectional view of the printing apparatus 100 taken along line II-II of FIG. 1. In FIG. 1, the transmission member 50 shown in FIG. 2 is indicated by a broken line. The printing apparatus 100 forms an image on a can body 10 used for a beverage can or the like based on digital image information. Further, the printing apparatus 100 forms an image on the can body 10 using an inkjet printing method.

[0011] As shown in FIG. 2, a control unit 60 is provided in the printing apparatus 100. The control unit 60 controls each device and each mechanism unit provided in the printing apparatus 100. Also, as shown in FIG. 1, a rotating member 210 is provided in the printing apparatus 100. The rotating member 210 is driven by a first motor M1 shown in FIG. 2. The rotating member 210 rotates intermittently in the direction shown by arrow 1A in the figure. The rotating member 210 is formed in a disk shape. The rotating member 210 rotates about a rotation center 1E shown in FIG. 1. This rotation center 1E extends in the vertical direction.

[0012] Inside the housing 290 shown in FIG. 2, a rotation mechanism (not shown) is provided. This rotation mechanism is constituted by a known mechanism such as a gear or a cam. The rotation mechanism rotates the rotating member 210 by receiving the force from the first motor M1. In the present embodiment, a rotation mechanism is provided around the rotating member 59. [[ID=A]] [[ID=B]]

[0013] [[ID=C]] [[ID=D]] FIG. 3 is a diagram showing the hardware configuration of the control unit 60. [[ID=E]] The control unit 60 is provided with a processing unit 901 and an information storage device 902 for storing information. [[ID=F]] The processing unit 901 is constituted by a computer. [[ID=G]] The processing unit 901 includes a CPU (= Central Processing Unit) 911 as an example of a processor. The processing unit 901 also includes a ROM (= Read Only Memory) 912 in which a program is stored. Further, the processing unit 901 includes a RAM (= Random Access Memory) 913 used as a work area. [[ID=H]] The information storage device 902 is realized by an existing device such as a hard disk drive, a semiconductor memory, or a magnetic tape. [[ID=I]] The processing unit 901 and the information storage device 902 are connected through a bus 906 and signal lines not shown. [[ID=J]]

[0014] [[ID=K]] The program executed by the CPU 911 can be provided to the control unit 60 via the recording medium. Examples of recording media include magnetic recording media such as magnetic tapes and magnetic disks. Other examples of recording media include optical recording media such as optical disks. Furthermore, magneto-optical recording media are another example. Finally, semiconductor memory is another example of a recording medium. Furthermore, the program executed by the CPU 911 may be provided to the control unit 60 using communication means such as the Internet. In this embodiment, the CPU 911 executes programs stored in the ROM 912 and the information storage device 902. This execution controls each device and mechanism provided in the printing device 100.

[0015] The printing apparatus 100 will be further described with reference to Figure 1. The printing device 100 is provided with a plurality of holding mechanisms 230 for holding the can body 10. The number of holding mechanisms 230 is 16. However, the number of holding mechanisms 230 is not particularly limited and may be other than 16.

[0016] As indicated by reference numeral 1X, each of the holding mechanisms 230 is provided with a shaft 230S. The shaft 230S is supported by the rotating member 210 in a rotatable state. The shaft 230S is capable of rotation in the circumferential direction. Furthermore, as indicated by reference numeral 1X, each of the holding mechanisms 230 is provided with a mandrel 230M. This mandrel 230M, as an example of a can support member, supports the can 10. The mandrel 230M is attached to one end of the shaft 230S. The mandrel 230M is supported by the rotating member 210. Specifically, the mandrel 230M is supported by the rotating member 210 via the shaft 230S. The mandrel 230M is positioned away from the rotation center 1E of the rotating member 210.

[0017] The other end of the shaft 230S is provided with a receiving gear 230G, which serves as a receiving member to receive rotational driving force. The receiving gear 230G is composed of helical gears. The receiving gear 230G meshes with the transmission member 50 and receives rotational driving force from this transmission member 50. In this embodiment, as shown in Figure 2, a gear portion 50G is provided on the outer circumference of the transmission member 50. The gear portion 50G is provided along the circumferential direction of the transmission member 50. The receiving gear 230G meshes with the gear portion 50G provided on the outer circumference of the transmission member 50. The receiving gear 230G receives rotational driving force from the gear portion 50G.

[0018] Multiple shafts 230S and mandrels 230M are provided, as shown in Figure 1. Furthermore, the shafts 230S and mandrels 230M are arranged radially around the arrangement center 1C, indicated by reference numeral 1C in Figure 1. In other words, the shaft 230S and the mandrel 230M are arranged radially around the rotation center 1E of the rotating member 210. The center of arrangement 1C and the center of rotation 1E of the rotating member 210 coincide.

[0019] The can body 10 is formed in a cylindrical shape. Furthermore, one end of the can body 10 in the longitudinal direction is provided with a bottom. This end is closed. On the other hand, the other end of the can body 10 is not sealed but is open. An open section is provided at the other end of the can body 10. The can body 10 is supported by the mandrel 230M in the manner shown by arrow 1G in Figure 1. The can body 10 is supported by the mandrel 230M by inserting the mandrel 230M into the interior of the can body 10 through the open portion of the can body 10.

[0020] As shown in Figure 2, a disc-shaped transmission member 50 is provided above the receiving gear 230G. The transmission member 50 meshes with the receiving gears 230G provided on each of the holding mechanisms 230. The transmission member 50 transmits rotational driving force to the receiving gears 230G, causing the mandrel 230M to rotate. Furthermore, the transmission member 50 is not limited to being positioned above the receiving gear 230G. The transmission member 50 may also be positioned below the receiving gear 230G.

[0021] The transmission member 50 is arranged coaxially with the rotating member 210. The rotation center 1F of the transmission member 50 is located on the extension of the rotation center 1E of the rotating member 210 (see Figure 1). Furthermore, as shown in Figure 1, the transmission member 50 is connected to multiple mandrels 230M. The transmission member 50 is connected to a plurality of mandrels 230M via a receiving gear 230G and a shaft 230S. The transmission member 50 rotates to transmit rotational driving force to each of the multiple mandrels 230M.

[0022] A cylindrical rotating member 59 is provided below the transmission member 50 shown in Figure 2. The rotating member 59 is connected to the transmission member 50. The rotating member 59 extends downward from the center of rotation of the transmission member 50. In other words, the rotating member 59 extends downward from the radial center of the transmission member 50. In this embodiment, rotational driving force is transmitted from the rotating member 59 to the transmission member 50. This causes the transmission member 50 to rotate. Accordingly, rotational driving force is transmitted from the transmission member 50 to each of the multiple mandrels 230M. In this embodiment, as shown in Figure 2, a second motor M2 is provided to rotate the rotating member 59. The rotating member 59 rotates by receiving the driving force from this second motor M2.

[0023] The transmission member 50 rotates in the direction indicated by arrow 1D in Figure 1. In this embodiment, the receiving gear 230G meshes with the rotating transmission member 50. As a result, the receiving gear 230G rotates, causing the mandrel 230M to rotate in the direction indicated by arrow 1M. Consequently, the can body 10 also rotates in the direction indicated by arrow 1M. In this embodiment, the transmission member 50 rotates in the opposite direction to the direction indicated by arrow 1A, which is the rotation direction of the rotating member 210. Alternatively, the transmission member 50 may rotate in the same direction as the rotation direction of the rotating member 210. The transmission member 50 rotates with a rotation center 1F located in the radial center of the transmission member 50. In this embodiment, this rotation center 1F coincides with the arrangement center 1C of the radially arranged mandrels 230M.

[0024] As shown in Figure 1, when the printing device 100 is viewed from above, the rotation center 1F and the placement center 1C are located at the same location. Furthermore, the rotation center 1E of the rotating member 210 is located at the same location as the rotation center 1F and the placement center 1C. Furthermore, in this embodiment, the transmission member 50 is located closer to the center 1C than the radially arranged mandrels 230M.

[0025] Furthermore, as shown in Figure 1, the printing apparatus 100 is equipped with six inkjet heads 260 that function as image forming means. In addition, the printing apparatus 100 is equipped with support members that support the six inkjet heads 260. These support members are not shown in the illustration. Six inkjet heads 260 are provided, specifically the first inkjet head 261 to the sixth inkjet head 266. In this embodiment, an example of an image forming means is described in which an inkjet head 260 is used. However, the image forming means is not limited to this, and other methods of forming images may also be used.

[0026] Six inkjet heads 260 form images on the can body 10, which is supported by a mandrel 230M. The six inkjet heads 260 are arranged in the direction of movement of the inkjet tank 10. In other words, the six inkjet heads 260 are arranged along the direction of rotation of the rotating member 210. Furthermore, the six inkjet heads 260 are arranged radially around the rotation center 1E of the rotating member 210.

[0027] As shown in Figure 2, the inkjet head 260 is positioned above the ink tank 10. The inkjet head 260 ejects ink toward the ink tank 10 located below it. The inkjet head 260 has a facing surface 241 that faces the ink tank 10. This facing surface 241 is provided with a plurality of ink ejection ports for ejecting ink.

[0028] Each of the inkjet heads 260 ejects ultraviolet-curable ink to form an image on the outer surface of the inkjet can 10. Furthermore, the ink used is not limited to UV-curing ink. Other inks, such as thermosetting inks, may also be used. Furthermore, each of the 260 inkjet heads ejects different inks, such as yellow, magenta, cyan, black, white, and spot colors, into the ink cartridge 10.

[0029] As shown in Figure 1, a UV LED (Ultraviolet Light Emitting Diode) lamp 250 is also provided. Here, we assume the rotation direction of the rotating member 210. In this rotational direction, the UV LED lamp 250, which functions as a light irradiation means, is located downstream of the six inkjet heads 260. In the transport direction of the can body 10, the UV LED lamp 250 is located downstream of the six inkjet heads 260.

[0030] In this embodiment, ultraviolet light is irradiated onto the outer surface of the can body 10 by the UV LED lamp 250. As a result, the ultraviolet-curable ink that constitutes the image on the outer surface of the can body 10 hardens. Furthermore, in this embodiment, a lamp housing box 70 for housing the UV LED lamp 250 is provided. By providing this lamp housing box 70, the direction of ultraviolet light to areas other than the can body 10 is suppressed. The lamp housing box 70 is provided with an inlet 71 and an outlet 72. The can body 10, supported by the mandrel 230M, enters the lamp housing box 70 through the inlet 71. The can body 10, also supported by the mandrel 230M, then moves outside the lamp housing box 70 through the outlet 72.

[0031] The rotating member 210 moves the mandrel 230M by passing it through each of the multiple inkjet heads 260. Furthermore, the rotating member 210 stops rotating after each rotation by a predetermined angle. In this embodiment, a total of 16 mandrel stopping points 801 to 816 are provided. In this embodiment, the mandrel 230M stops at each of these mandrel stopping points 801 to 816. In other words, the can body 10 stops at each of these mandrel stopping points 801 to 816.

[0032] In this embodiment, the rotating member 210 is rotated intermittently to transport the can body 10 along a predetermined circular path. Furthermore, each time the can body 10 reaches one of the 16 mandrel stopping points 801 to 816, the can body 10 is temporarily stopped. In this embodiment, the rotating member 210 is rotated intermittently to cause the can body 10 to revolve. In addition, the can body 10 is temporarily stopped each time it reaches one of the 16 mandrel stopping points 801 to 816.

[0033] In this embodiment, inkjet heads 260 are provided at six mandrel stopping points 804 to 809. Furthermore, a UV LED lamp 250 is provided at one of the other mandrel stopping points 811. Hereinafter, in this specification, the mandrel stopping points 804 to 809 on which the inkjet head 260 is installed will be referred to as "image forming stopping points 804 to 809". Furthermore, the mandrel stopping point 811 where the UV LED lamp 250 is installed is referred to as the "light irradiation stopping point 811". In this embodiment, one additional mandrel stop location, indicated by reference numeral 810, is provided between the image-forming stop locations 804-809 and the light irradiation stop location 811.

[0034] In this embodiment, ultraviolet light is emitted from the UV LED lamp 250. In this case, ultraviolet light may reach the inkjet head 260 located upstream. In this case, the ink may harden at the inkjet head 260. In this case, ink clogging may occur, or the quality of the resulting image may deteriorate. Therefore, in this embodiment, as described above, one mandrel stop location 810 is provided between the image forming stop locations 804 to 809 and the light irradiation stop location 811.

[0035] This increases the distance between the UV LED lamp 250 and the inkjet head 260. In this case, the amount of ultraviolet light reaching the inkjet head 260 is reduced. Furthermore, the mandrel stopping point 810 is not limited to one; two or more mandrel stopping points 810 may be provided.

[0036] Furthermore, the printing apparatus 100 of this embodiment is provided with a can loading section 91, as shown in Figure 1. The can loading section 91 is located upstream of the multiple inkjet heads 260. In the can body insertion section 91, the inside of the cylindrically formed mandrel 230M is subjected to negative pressure. As a result, the mandrel 230M is drawn in by the can body 10, and the mandrel 230M enters the interior of the can body 10. This initiates the support of the can body 10 by the mandrel 230M.

[0037] An inspection mechanism 92 is provided between the can input section 91 and the inkjet head 260. This inspection mechanism 92, as an example of an inspection means, inspects the inserted can 10. In this embodiment, the inspection mechanism 92 is provided upstream of the inkjet head 260. In this embodiment, the can body 10 is inspected before image formation is performed by the inkjet head 260.

[0038] Figure 4 shows the inspection mechanism 92 as viewed from the direction of arrow IV in Figure 1. The inspection mechanism 92 inspects whether the can body 10 is deformed or not. As shown in Figure 4, the inspection mechanism 92 is equipped with a light source 92A that emits laser light. The light source 92A is located on one end of the can body 10. The laser light emitted from the light source 92A travels along the outer surface of the can body 10 and along the axial direction of the can body 10. Furthermore, a light-receiving unit 92B is provided at the other end of the can body 10 to receive laser light from the light source 92A.

[0039] If a part of the can body 10 is deformed as shown by reference numeral 3A, the laser light will be blocked. In this case, the light receiving unit 92B will not receive the laser light. This allows the deformation of the can body 10 to be detected. Furthermore, in this embodiment, as shown in Figure 1, a discharge mechanism 93 is provided as an example of a discharge means. The discharge mechanism 93 discharges the can body 10, which has been detected to be deformed, to the outside of the printing device 100. In this embodiment, if the inspection mechanism 92 determines that the can body 10 does not meet predetermined conditions, the discharge mechanism 93 discharges the can body 10. More specifically, if the inspection mechanism 92 determines that the can body 10 is deformed, the discharge mechanism 93 discharges the can body 10.

[0040] As shown in Figure 1, the ejection mechanism 93 is located between the inspection mechanism 92 and the inkjet head 260. The ejection mechanism 93 is located upstream of the inkjet head 260. Therefore, in this embodiment, the can body 10 is ejected before image formation is performed by the inkjet head 260.

[0041] In the discharge mechanism 93, compressed air is supplied to the inside of the mandrel 230M. This causes the can body 10 to move in the direction indicated by arrow 1H in the figure. Furthermore, the bottom of the can body 10 is sucked by a suction member (not shown). In other words, the closed end of the can body 10 is sucked by a suction member (not shown). Then, the suction member transports the can 10 to the outside of the printing device 100. As a result, the can 10 is discharged to the outside of the printing device 100.

[0042] The printing apparatus 100 will be further described with reference to Figure 1. A paint application device 94 is provided downstream of the UV LED lamp 250. In other words, a paint application device 94 is provided downstream of the mandrel stopping point 811. The paint application device 94 has a rotating body (not shown). In the paint application device 94, paint is first supplied to the outer surface of this rotating body. Then, the paint application device 94 brings the outer surface of the rotating body into contact with the outer surface of the can body 10. As a result, paint adheres to the outer surface of the can body 10. When paint adheres to the outer surface of the can body 10, a protective layer is formed on the outer surface of the can body 10.

[0043] Subsequently, in this embodiment, the can body 10 is discharged at the can body discharge section 95 downstream of the paint application device 94. In other words, the can body 10 is discharged at the mandrel stopping point 815. At the can body discharge section 95, compressed air is supplied to the inside of the mandrel 230M. This removes the can body 10 from the mandrel 230M. Furthermore, the can body 10 is transported to the outside of the printing device 100 by a transport mechanism (not shown). The can body 10, once transported outside the printing device 100, is then transported to a baking process (not shown). In this baking process, the can body 10 undergoes a heat treatment.

[0044] Referring to Figure 1, a series of operations of the printing device 100 will be explained. When printing is performed by the printing device 100, the transmission member 50 first starts rotating in the direction indicated by arrow 1D. This causes the mandrel 230M to start rotating in the direction indicated by arrow 1M. At the boiler input section 91, the boiler 10, which has been transported from the upstream side, is attached to the mandrel 230M. In this embodiment, the can 10 is transported from the upstream side to the can input section 91. At this time, an empty mandrel 230M is waiting in the can input section 91.

[0045] Furthermore, the inside of this empty mandrel 230M is subjected to negative pressure, and the can 10 is drawn in by this empty mandrel 230M. As a result, the mandrel 230M enters the inside of the can body 10. In this embodiment, the mandrel 230M enters the inside of the can body 10, thereby initiating support of the can body 10 by the mandrel 230M.

[0046] After the mandrel 230M begins supporting the can body 10, the rotating member 210, which was in a stationary state, starts to rotate. The rotating member 210 rotates by a predetermined angle in the direction indicated by arrow 1A in the figure and then stops again. This allows the can body 10 to reach the inspection mechanism 92. In other words, in this case, the can body 10 revolves and reaches the inspection mechanism 92. Subsequently, the rotating member 210 rotates again by a predetermined angle. This causes the can body 10 to revolve and reach the discharge mechanism 93. Subsequently, the rotating member 210 rotates again by a predetermined angle. As a result, the can body 10 revolves and reaches below the first inkjet head 261. The can body 10 then temporarily stops below the first inkjet head 261.

[0047] Then, ink is ejected from this first inkjet head 261 toward the rotating ink tank 10 located below it. In other words, ink is ejected from the first inkjet head 261 toward the rotating ink tank 10. As a result, an image is formed on the outer surface of the can body 10 using the first color of ink.

[0048] Subsequently, in this embodiment, the rotating member 210 is rotated and stopped again. As a result, the can body 10 stops below the second inkjet head 262, which is the second inkjet head 260. In other words, the can body 10 revolves and stops, and the can body 10 stops below the second inkjet head 262. Then, this second inkjet head 262 forms the image using the second color of ink.

[0049] Subsequently, in this embodiment, the ink cartridge 10 is moved to the third inkjet head 263. Then, the third inkjet head 263 forms an image. Subsequently, the ink cartridge 10 is moved to the fourth inkjet head 264. Then, the fourth inkjet head 264 forms an image. Furthermore, images are similarly formed on the fifth inkjet head 265 and the sixth inkjet head 266.

[0050] In the above explanation, we described the case where all six inkjet heads 260 are used to form an image as an example. The manner in which the image is formed is not limited thereto. The image may be formed using some of the six inkjet heads 260.

[0051] In this embodiment, the transmission member 50 rotates when the inkjet head 10 moves between the inkjet heads 260. In other words, in this embodiment, the transmission member 50 rotates when the inkjet head 10 revolves. This causes the can body 10 to rotate. When the can body 10 rotates, uneven ink application becomes less likely.

[0052] Let's consider the case where the can body 10 is moved while its rotation is stopped. In other words, let's consider the case where the can body 10 revolves around an orbit while it is not rotating on its own axis. In this case, the ink adhering to the can body 10 may move downward due to gravity, potentially causing uneven ink distribution. In contrast, in a configuration where the can body 10 rotates as it moves, uneven ink adhesion is less likely to occur.

[0053] After passing through the inkjet head 260, the ink can 10 moves to below the UV LED lamp 250. This causes ultraviolet light to be irradiated onto the outer surface of the ink can 10. As a result, the ink on the outer surface of the ink can 10 hardens. Subsequently, the paint is applied to the outer surface of the can body 10 by the paint application device 94.

[0054] Next, compressed air is supplied to the inside of the mandrel 230M at the can body discharge section 95. As a result, the inner surface of the can body 10 attached to the mandrel 230M is pressed by this compressed air. Consequently, the can body 10 is removed from the mandrel 230M. The can body 10, removed from the mandrel 230M, is transported to a baking process (not shown). In this baking process, heat treatment is performed, which hardens the paint applied to the can body 10.

[0055] Figure 5 shows the state of the printing device 100 when treatment is being performed on the inkjet head 260. Figure 5 shows the state of the printing device 100 as viewed from above. In this embodiment, when the inkjet head 260 is treated, the gap 78 between the mandrels 230M is positioned opposite the inkjet head 260.

[0056] When processing is performed on the inkjet head 260, the mandrel 230M stops at a location different from the mandrel stopping points 801-816. In this embodiment, the mandrels 230M stop when the gap 78 between them is located opposite the inkjet head 260. In this embodiment, when processing is performed on the inkjet head 260, the rotation of the transmission member 50 is also stopped.

[0057] In this embodiment, in response to instructions from the user, a control unit 60, which is an example of a control means, stops the movement of the multiple mandrels 230M. As a result, the printing device 100 enters the state shown in Figure 5. More specifically, for example, information is input from the user indicating that they want to change the mode to cleaning mode. In response, the control unit 60 moves the mandrel 230M and stops it, resulting in the state shown in Figure 5. Instructions from the person giving the instructions are received, for example, through a user interface (not shown). This user interface is configured, for example, as a touch panel.

[0058] In this embodiment, when processing is performed on the inkjet head 260, the printing device 100 is in the state shown in Figure 5. In the state shown in Figure 5, the gap 78 between two adjacent mandrels 230M is located opposite the inkjet head 260. The control unit 60 controls the rotation of the rotating member 210 to arrange the mandrel 230M, which is an example of a can support member, in the arrangement shown in Figure 5. The mandrel 230M moves in a circular motion around the rotation center 1E of the rotating member 210. The control unit 60 controls the position of the mandrel 230M as it moves in a circular motion. As a result, the arrangement of the mandrel 230M becomes as shown in Figure 5.

[0059] The movement of the mandrel 230M is controlled using a rotary encoder (not shown). The rotary encoder rotates in conjunction with the rotating member 210. The control unit 60 determines the rotation angle of the rotating member 210 based on the output from the rotary encoder. The control unit 60 controls the first motor M1 (see Figure 2) based on the specified rotation angle. The control unit 60 also controls the rotation of the rotating member 210 based on the specified rotation angle.

[0060] In this embodiment, the rotation angle of the rotating member 210 is registered in the information storage device 902 shown in Figure 3. The information storage device 902 stores the rotation angle when the gap 78 is positioned opposite the inkjet head 260. In other words, the information storage device 902 stores the rotation angle when the gap 78 is positioned directly below the inkjet head 260. The control unit 60 controls the first motor M1 so that the angle determined based on the output from the rotary encoder matches the registered rotation angle.

[0061] As a result, the mandrel 230M stops with the gap 78 located directly beneath the inkjet head 260. In other words, the mandrel 230M stops when it is not located directly beneath the inkjet head 260. This creates space directly beneath the inkjet head 260, making it easier to perform procedures on the inkjet head 260. Compared to a configuration where there is no space directly beneath the inkjet head 260, this makes it easier to perform procedures on the inkjet head 260.

[0062] One possible course of action for the inkjet head 260 is to inspect it. Another possible course of action for the inkjet head 260 is to clean it. Treatment of the inkjet head 260 is performed, for example, by a technician. In addition, this procedure may be carried out by, for example, a device. When the procedure is carried out by a device, the installer will install the device within the gap 78.

[0063] Multiple sets of two adjacent mandrels 230M are provided. In this embodiment, a gap 78 is provided between each set. Furthermore, multiple inkjet heads 260 are provided. In addition, the inkjet heads 260 are arranged in the direction of movement of the mandrel 230M. Figure 5 shows the state in which the movement of the multiple mandrels 230M has stopped, as described above. In this state, gaps 78 are located at the opposing points of each of the multiple inkjet heads 260.

[0064] Figure 6 shows another example configuration of the printing apparatus 100. Figure 6 shows the cross-sectional state along the VI-VI line in Figure 5. Figure 6 shows the state in cleaning mode. In this embodiment, during cleaning mode, the gap 78 is located opposite the inkjet head 260, as described above. Figure 6 shows the state in which the gap 78 is located opposite the first inkjet head 261. The gap 78 is located directly below the first inkjet head 261. In this state, the mandrel 230M is not located directly beneath the first inkjet head 261.

[0065] In this configuration example, a cleaning device 510 is provided for cleaning the first inkjet head 261. The cleaning device 510 is designed to be movable in the vertical direction. The cleaning device 510 moves from outside the gap 78 into the gap 78, as indicated by arrow 6A. When the cleaning device 510 enters cleaning mode, it moves into the gap 78 located opposite the first inkjet head 261. The cleaning device 510 then cleans the first inkjet head 261.

[0066] When multiple mandrels 230M are being circulated, the cleaning device 510 is positioned away from the gap 78. In other words, during the printing mode when printing is being done on the can body 10, the cleaning device 510 is positioned away from the gap 78. In this configuration example, a moving mechanism 520 is provided to move the cleaning device 510. This moving mechanism 520 causes the cleaning device 510 to move up and down. The moving mechanism 520 is equipped with a drive source such as a motor. The moving mechanism 520 may use any known mechanism and is not particularly limited.

[0067] As described above, the cleaning device 510 moves from outside the gap 78 to inside the gap 78. Also, the cleaning device 510 moves from inside the gap 78 to outside the gap 78. In other words, the cleaning device 510 moves toward the first inkjet head 261. Also, the cleaning device 510 moves toward the direction away from the first inkjet head 261.

[0068] The cleaning device 510 moves from outside the gap 78 to inside the gap 78, and then cleans the first inkjet head 261. The cleaning device 510 cleans the first inkjet head 261 when the gap 78 is located opposite the first inkjet head 261. The cleaning device 510 cleans the first inkjet head 261 when the gap 78 is located directly below the first inkjet head 261.

[0069] Once cleaning by the cleaning device 510 is complete, the cleaning device 510 moves from inside the gap 78 to outside the gap 78. In other words, the cleaning device 510 moves away from the first inkjet head 261. Once cleaning by the cleaning device 510 is complete, the cleaning device 510 descends. In other words, the cleaning device 510 retracts from the first inkjet head 261. Once cleaning by the cleaning device 510 is complete, the cleaning device 510 moves to a location off the movement path 540 of the mandrel 230M. This prevents interference between the cleaning device 510 and the mandrel 230M during printing mode.

[0070] In Figure 6, the black circle indicated by the symbol 6B represents the movement path 540 of the mandrel 230M. This movement path 540 extends in a direction perpendicular to the plane of Figure 6. When the movement of mandrel 230M is stopped, the gap 78 is located on the movement path 540 of mandrel 230M. When the mandrel 230M is circulating, the cleaning device 510 is located outside the movement path 540. In other words, in print mode, the cleaning device 510 is located outside the movement path 540. When in cleaning mode, the cleaning device 510 moves along this movement path 540.

[0071] The cleaning device 510 is provided in such a way that it can be moved into the gap 78. Furthermore, the cleaning device 510 is provided so that it can be moved outside the gap 78. In other words, the cleaning device 510 is provided so that it can be moved to a location off the movement path 540 of the mandrel 230M.

[0072] The cleaning device 510 is provided to be movable in the vertical direction. The cleaning device 510 can be retracted below the movement path 540 of the mandrel 230M. Each of the mandrels 230M moves below the inkjet head 260. The cleaning device 510 can retract the moving mandrels 230M below the movement path 540.

[0073] The cleaning device 510 and the moving mechanism 520 are supported from below by a support portion 530. The support portion 530 is fixed to a device frame (not shown). The cleaning device 510 and the moving mechanism 520 are provided in a manner that corresponds to the first inkjet head 261.

[0074] In addition, a cleaning device 510 and a moving mechanism 520 are provided, corresponding to each of the second inkjet heads 262 to the sixth inkjet heads 266. Note that the cleaning devices 510 and moving mechanisms 520 corresponding to the second inkjet heads 262 to the sixth inkjet heads 266 are not shown in the illustration. In this embodiment, six cleaning devices 510 and moving mechanisms 520 are provided.

[0075] The same process is performed on the second inkjet head 262 to the sixth inkjet head 266. When in cleaning mode, the gap 78 is located directly beneath each of the second inkjet heads 262 through the sixth inkjet heads 266. The cleaning devices 510, each provided for the second inkjet head 262 to the sixth inkjet head 266, move into this gap 78. Then, cleaning is performed by the cleaning device 510. After that, the cleaning device 510 retracts from the second inkjet head 262 to the sixth inkjet head 266.

[0076] In cleaning mode, the movement of the mandrel 230M stops. The rotation of the transmission member 50 also stops. When in cleaning mode, each of the multiple cleaning devices 510 moves. Each cleaning device 510 moves into the gap 78 located opposite the corresponding inkjet head 260. Then, each cleaning device 510 cleans the corresponding inkjet head 260. Subsequently, each of the cleaning devices 510 descends. In other words, each of the cleaning devices 510 moves out of the gap 78.

[0077] In this embodiment, the cleaning device 510 is moved by control from the control unit 60. Furthermore, cleaning by the cleaning device 510 is initiated by control from the control unit 60. The cleaning of the inkjet head 260 by the cleaning device 510 is not particularly limited. For example, the cleaning of the inkjet head 260 by the cleaning device 510 may include spraying a cleaning solution onto the inkjet head 260.

[0078] Furthermore, the cleaning of the inkjet head 260 by the cleaning device 510 includes the spraying of gas. More specifically, it involves spraying gas onto the inkjet head 260. Blowing gas onto the inkjet head 260 accelerates the evaporation of the cleaning solution adhering to the inkjet head 260. The above-mentioned moving mechanism 520 is not mandatory. The operator may manually move the cleaning device 510 into the gap 78.

[0079] Figure 7 shows another example of the configuration of the printing apparatus 100. In this configuration example, the cleaning device 510 can be moved along the longitudinal direction of the first inkjet head 261. The first inkjet head 261 is positioned along a direction intersecting the direction of movement of the mandrel 230M. In Figure 7, the direction perpendicular to the plane of the paper in Figure 7 is the direction of movement of the mandrel 230M. In this configuration example shown in Figure 7, the cleaning device 510 moves along the longitudinal direction of the first inkjet head 261.

[0080] In this configuration example as well, when the cleaning mode is activated, the cleaning device 510 moves into the gap 78. The moving mechanism 520 is activated, and the cleaning device 510 moves into the gap 78. The cleaning device 510 approaches the movement path 540 from the side of the movement path 540. The cleaning device 510 moves from the side of the movement path 540 towards the rotating member 210. As a result, the cleaning device 510 enters the gap 78. The cleaning device 510 moves directly below the first inkjet head 261. Then, the cleaning device 510 cleans the first inkjet head 261.

[0081] Subsequently, the cleaning device 510 moves out of the gap 78. During this movement, the cleaning device 510 moves along the longitudinal direction of the first inkjet head 261 and away from the rotating member 210. As a result, the cleaning device 510 is positioned off the travel path 540. In this configuration example, when retracting the cleaning device 510, the cleaning device 510 is moved to the side of the movement path 540 of the mandrel 230M. In this configuration example, as described above, the cleaning device 510 is provided in a manner that corresponds to each of the six inkjet heads 260.

[0082] Figure 8 shows another configuration example of the printing apparatus 100. Figure 8 shows the printing apparatus 100 as viewed from above. Figure 9 is a cross-sectional view of the printing apparatus 100 along the line IX-IX in Figure 8. Figures 8 and 9 show the state of the printer 100 in cleaning mode.

[0083] In the configuration example shown in Figure 8, a device support section 282 is provided to support the cleaning device 510 that cleans the inkjet head 260. This device support section 282 is supported by a rotating member 210. The device support section 282 moves in a circular motion together with the mandrel 230M. The device support section 282 is installed between two adjacent mandrels 230M.

[0084] The device support section 282 is provided to be movable. As shown by arrow 9A in Figure 9, the device support portion 282 is provided to be movable in a direction toward the gap 78 and in a direction toward the gap 78. The outer circumferential surface 210A of the rotating member 210 is provided with a projection 210B that protrudes from this outer circumferential surface 210A. The projection 210B extends along the radial direction of the rotating member 210. Furthermore, the projection 210B is provided in a manner that corresponds to each of the six inkjet heads 260.

[0085] In this embodiment, during cleaning mode, the control unit 60 controls the rotation of the rotating member 210. This control results in the protruding portion 210B being positioned directly below each of the inkjet heads 260, as shown in Figure 8. The device support portion 282 is guided by the protrusion 210B when it moves. The device support portion 282 is supported from below by the protrusion 210B.

[0086] As shown by arrow 9A in Figure 9, the device support portion 282 is provided to be movable along the longitudinal direction of the inkjet head 260. The device support portion 282 is also provided to be movable along the radial direction of the rotating member 210. In cleaning mode, as described above, the gap 78 is located opposite the inkjet head 260, as shown in Figure 9.

[0087] In cleaning mode, the cleaning device 510 is installed by the installer on the device support section 282 shown in Figure 9. Subsequently, the installer presses the cleaning device 510, moving it below the inkjet head 260. In other words, the cleaning device 510 is moved into the gap 78. The installer presses the cleaning device 510 toward the side where the rotating member 210 is located. This causes the cleaning device 510 to move downwards from the inkjet head 260. Subsequently, the inkjet head 260 is cleaned by the cleaning device 510.

[0088] Subsequently, the cleaning device 510 is moved again by the installer. The installer moves the cleaning device 510 away from the rotating member 210. At this time, the device support part 282 also moves in the same direction away from the rotating member. Subsequently, the cleaning device 510 is removed by the installer. In this embodiment, the cleaning device 510 is first installed on the device support 282. Then, the cleaning device 510 is moved into the gap 78. In this embodiment, the cleaning device 510 can be easily installed within the gap 78.

[0089] The printing device 100 may be configured in a way other than having the cleaning device 510 permanently installed. As shown in Figure 9, the cleaning device 510 may be installed only when cleaning is required. In this explanation, we have described the case in which the cleaning device 510 installed on the device support section 282 is moved manually. However, a moving mechanism equipped with a drive source such as a motor may also be provided. This moving mechanism may be used to move the cleaning device 510 installed on the device support section 282.

[0090] Furthermore, this section describes the case in which the device support portion 282 is supported by the rotating member 210 via the protruding portion 210B. The device support portion 282 may also be supported by a device frame (not shown). In this case, the device support portion 282 does not move in conjunction with the rotating member 210.

[0091] Figure 10 shows another configuration example of the printing device 100. Figure 10 also shows the state in cleaning mode. Similar to Figure 9, Figure 10 shows the state on line IX-IX in Figure 8. In the configuration example shown in Figure 10, the device support unit 282 is located below the inkjet head 260. Furthermore, the device support unit 282 is provided to be movable in the vertical direction. In this configuration example as well, the device support portion 282 is supported by the rotating member 210. The device support portion 282 is supported by the rotating member 210 via a mounting member 218 attached to the rotating member 210.

[0092] The device support portion 282 is provided to be movable relative to the mounting member 218. The device support portion 282 is provided to be able to move up and down. Furthermore, in this embodiment, a guide member 289 is provided to guide the device support portion 282. The guide member 289 is supported by a mounting member 218. The guide member 289 is also provided in a manner that extends in the vertical direction.

[0093] In this configuration example, the cleaning device 510 is first installed on the device support section 282 by the installer. Subsequently, the installer moves the device support section 282 and the cleaning device 510 upwards. As a result, the cleaning device 510 moves to directly below the inkjet head 260. The installer then operates a fixing mechanism (not shown) to secure the device support 282 to the guide member 289. This restricts the descent of the cleaning device 510.

[0094] Then, the inkjet head 260 is cleaned by the cleaning device 510. Once cleaning the inkjet head 260 is complete, the installer releases the fixing mechanism. This causes the cleaning device 510 and the device support unit 282 to descend. The installer then removes the cleaning device 510 from the device support unit 282. In addition, as described above, in this configuration example shown in Figure 10, the cleaning device 510 may also be moved up and down using a moving mechanism. Alternatively, the mounting member 218 may be fixed to the device frame instead of being fixed to the rotating member 210.

[0095] Figure 11 shows another example of the configuration of the printing device 100. Figure 11 shows the printing device 100 as viewed from above. In this configuration example, the inkjet head 260 is provided in a movable state. In this configuration example, a disc-shaped support member 268 is provided to support the six inkjet heads 260. The support member 268 is rotatably mounted around a rotation center 268A. This rotation center 268A extends in the vertical direction. Furthermore, this rotation center 268A coincides with the rotation center 1E of the rotating member 210.

[0096] Furthermore, in this configuration example, a rotating mechanism 271 is provided for rotating the support member 268. The rotating mechanism 271 is equipped with a drive source such as a motor. The rotating mechanism 271 can be implemented using a known mechanism and is not particularly limited. In this configuration example, the inkjet head 260 is configured to move in the direction of movement of the mandrel 230M and in the opposite direction. In this embodiment, the mandrel 230M moves in a clockwise direction. The inkjet head 260 is provided to be able to move in both clockwise and counterclockwise directions, as indicated by arrow 11A in the figure.

[0097] In this configuration example, when the cleaning mode is selected, the control unit 60 activates the rotation mechanism 271 to rotate the support member 268. As a result, the inkjet head 260 moves to the opposite side of the gap 78 between the two adjacent mandrels 230M. When the system is set to cleaning mode, first the rotation of the rotating member 210 stops, and the movement of the mandrel 230M stops. Then, the control unit 60 activates the rotating mechanism 271 to rotate the support member 268. As a result, the inkjet head 260 moves to the opposite side of the gap 78 between the two adjacent mandrels 230M.

[0098] In this configuration example, a rotary encoder is provided that rotates in conjunction with the rotating member 210. Additionally, a rotary encoder is provided that rotates in conjunction with the support member 268. The control unit 60 determines the rotation angle of the rotating member 210 and the rotation angle of the support member 268 based on the outputs from the two rotary encoders. The control unit 60 then controls the rotation of the support member 268 based on these two rotation angles. As a result, the inkjet head 260 moves to the opposite side of the gap 78 between the two adjacent mandrels 230M.

[0099] In this explanation, we describe a configuration in which the inkjet head 260 moves automatically under the control of the control unit 60. Incidentally, this is not the only way; the operator can also manually move the inkjet head 260. In this case, the operator manually rotates the support member 268. This allows the inkjet head 260 to be moved to the opposite location of the gap 78 between the mandrels 230M, even in this case. Alternatively, each of the inkjet heads 260 may be configured to move individually. In this case, each of the inkjet heads 260 is moved individually to the opposite location in the gap 78.

[0100] 〔others〕 The above describes a configuration in which the mandrel 230M circulates around a rotation center along the vertical direction, and the inkjet head 260 is positioned opposite the gap 78. The embodiments described above may also be applied to a printing apparatus 100 in which the mandrel 230M circulates around a center of rotation along a direction intersecting the vertical direction. More specifically, the embodiments described above may be applied, for example, to a printing apparatus 100 in which the mandrel 230M circulates around a rotation center along the horizontal direction.

[0101] Figure 12 shows a printing apparatus 100 in which the mandrel 230M circulates around a center of rotation along a direction intersecting the vertical direction. Note that the can body 10 is not shown in Figure 12. In this printing apparatus 100, the mandrel 230M and the can body 10 are arranged, for example, along the horizontal direction. Furthermore, in this printing apparatus 100, the mandrel 230M and the can body 10 are arranged along a direction perpendicular to the direction of movement of the mandrel 230M and the can body 10.

[0102] Furthermore, in this printing apparatus 100, the inkjet head 260 is positioned above the circulation path R100 on which the can body 10 moves. Furthermore, the inkjet head 260 is positioned along a direction perpendicular to the direction of movement of the mandrel 230M and the can body 10. In a printing apparatus 100 with such a configuration, the same configuration as described above may also be adopted. In other words, a configuration may be adopted in which the mandrels 230M and the inkjet head 260 stop when the inkjet head 260 is positioned opposite the gap 78 between the mandrels 230M. [Explanation of symbols]

[0103] 10...Can body, 60...Control unit, 78...Gap, 100...Printing device, 230M...Mandrel, 260...Inkjet head, 282...Device support unit, 510...Cleaning device, 540...Movement path

Claims

1. Multiple can support members that support the can body and allow it to circulate, An inkjet head that ejects ink onto a can supported by the can support member, A control means that causes the plurality of can body support members to stop when the gap between two adjacent can body support members is located at the opposite position of the inkjet head, A printing device equipped with the following features.

2. Multiple sets of the two adjacent can body support members are provided, and the gap is provided for each set. Multiple inkjet heads are provided and are arranged in the direction of movement of the can support member. The printing apparatus according to claim 1, wherein when the movement of the plurality of can support members is stopped, the gap is located at the opposing location of each of the plurality of inkjet heads.

3. The printing apparatus according to claim 1, further comprising a cleaning device for cleaning the inkjet head, the cleaning device moving into the gap located opposite the inkjet head and cleaning the inkjet head.

4. The printing apparatus according to claim 3, wherein the cleaning device is positioned outside the gap when the plurality of can body support members are circulating.

5. Multiple sets of the two adjacent can body support members are provided, and the gap is provided for each set. Multiple inkjet heads are provided and are arranged in the direction of movement of the can support member. When the movement of the plurality of can support members is stopped, the gap is located at the opposing location of each of the plurality of inkjet heads. The printing apparatus according to claim 3, wherein the cleaning device is provided in a manner corresponding to each of the plurality of inkjet heads, and when the movement of the plurality of can support members is stopped, each of the cleaning devices moves into the gap located opposite the corresponding inkjet head.

6. The printing apparatus according to claim 1, further comprising a device support portion for supporting a cleaning device for cleaning the inkjet head, the device support portion being movably provided and capable of moving toward and toward the gap located opposite the inkjet head.

7. The printing apparatus according to claim 6, wherein the apparatus support portion is provided so as to be movable along the longitudinal direction of the inkjet head.

8. The plurality of can support members pass below the inkjet head, The printing apparatus according to claim 6, wherein the apparatus support portion is located below the inkjet head and is provided to be movable in the vertical direction.

9. The printing apparatus according to claim 1, further comprising a cleaning device that is movably provided and for cleaning the inkjet head, the cleaning device being movable into the gap located opposite the inkjet head.

10. When the movement of the plurality of can body support members is stopped, the gap located at the opposing point is located on the movement path of the plurality of can body support members. The printing apparatus according to claim 9, wherein the cleaning device is provided so as to be movable into the gap and so as to be moved to a location off the movement path of the plurality of can support members.

11. The inkjet head is arranged along a direction intersecting the movement direction of the plurality of can support members. The printing apparatus according to claim 10, wherein the cleaning device is provided so as to be able to move along the longitudinal direction of the inkjet head and so as to be able to be moved to the side of the movement path of the plurality of can support members.

12. The plurality of can support members move below the inkjet head, The printing apparatus according to claim 10, wherein the cleaning device is provided to be movable in the vertical direction and can be retracted below the movement path of the plurality of can support members.

13. Multiple can support members are provided to allow for circulating movement and to support the can body, An inkjet head is provided that can move in the direction of movement of the can support member and in the direction opposite to that direction of movement, and ejects ink onto the can supported by the can support member, A printing device equipped with the following features.

14. The printing apparatus according to claim 13, further comprising control means for moving the inkjet head to an opposing location in the gap between two adjacent can support members.

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