Patent Publication Number: US-11396189-B2

Title: Printing apparatus having inkjet heads for printing can bodies at linear part of annular movement route

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application is a 371 application of the international PCT application serial no. PCT/JP2018/032975, filed on Sep. 6, 2018, which claims the priority benefits of Japan application no. 2017-252472 filed on Dec. 27, 2017. The entirety of each of the abovementioned patent applications is hereby incorporated by reference herein and made a part of this specification. 
     TECHNICAL FIELD 
     The present invention relates to a printing apparatus. 
     BACKGROUND ART 
     In Patent Document 1, there is disclosed a printing device, in which inkjet printing is performed in at least one inkjet printing station, and plural inkjet heads are arranged in the inkjet printing station. 
     CITATION LIST 
     Patent Literature 
     Patent Document 1: Japanese Patent Application Laid-Open Publication No. 2012-232771 
     SUMMARY OF INVENTION 
     Technical Problem 
     In a printing apparatus performing printing on can bodies, for example, a mode can be considered in which a movement route of the can bodies is formed into an annular shape and plural inkjet heads are installed around the route. 
     By the way, formation of the movement route of the can bodies into an annular shape makes attitudes of the inkjet heads differ one by one; accordingly, there is a possibility that quality of images to be formed is degraded compared to the case in which the attitudes of the inkjet heads are the same. 
     An object of the present invention is to suppress degradation of image quality that may happen in the case of forming a movement route of can bodies into an annular shape when an image is to be formed on a can body by use of plural inkjet heads. 
     Solution to Problem 
     A printing apparatus to which the present invention is applied includes: a support member supporting a can body; a movement route on which the support member moves, the movement route being formed into an annular shape and partially including a linear part, which is a linear-shaped movement route; and plural inkjet heads performing image formation onto the can body supported by the support member positioned at the linear part. 
     Here, the annular-shaped movement route is disposed to cause an axial center of the movement route to be arranged along a horizontal direction. 
     Moreover, the linear part is provided to an uppermost portion of the annular-shaped movement route, and the plural inkjet heads are provided above the linear part positioned at the uppermost portion. 
     In addition, the linear part is disposed to extend along the horizontal direction. 
     Moreover, the printing apparatus further includes: a processing unit performing processing on the can body supported by the support member positioned on the movement route, wherein the processing unit is provided on at least one of a lateral side of a portion of the movement route heading downward from above and a lateral side of a portion of the movement route heading upward from below. 
     Moreover, the can body is supplied to the support member positioned on the movement route at a can body supply part and the can body is taken out of the support member positioned on the movement route at a can body detachment part, and the can body supply part is provided to one of an upper portion and a lower portion of the annular-shaped movement route, and the can body detachment part is provided to the other. 
     Moreover, the printing apparatus further includes: a processing unit performing processing on the can body supported by the support member positioned on the movement route, wherein the processing unit performs image formation onto the can body by use of a plate printing method. 
     Moreover, the printing apparatus further includes: a processing unit performing processing on the can body supported by the support member positioned on the movement route, wherein the processing unit forms a transparent layer covering the image formed on an outer circumferential surface of the can body by the plural inkjet heads. 
     In addition, a light irradiation unit is provided on a lateral side of the linear part, the light irradiation unit irradiating the image formed on an outer circumferential surface of the can body by the plural inkjet heads with light. 
     In addition, the can body moves in a state of being laid, and image formation onto an outer circumferential surface of the can body is performed by the plural inkjet heads from above the can body. 
     Advantageous Effects of Invention 
     According to the present invention, it is possible to suppress degradation of image quality that may happen in the case of forming a movement route of can bodies into an annular shape when an image is to be formed on a can body by use of plural inkjet heads. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is a side elevational view of a printing apparatus; 
         FIG. 2  is a diagram illustrating an inspection device; 
         FIG. 3  is a diagram showing Comparative example of the printing apparatus; 
         FIG. 4  is a top view showing another configuration example of the printing apparatus; 
         FIG. 5  is a diagram of a case in which an inkjet head and a moving unit are viewed from a direction of an arrow V in  FIG. 1 ; 
         FIGS. 6A and 6B  are diagrams illustrating a pressed part and a columnar-shaped member, respectively; 
         FIGS. 7A and 7B  are diagrams showing another configuration example of the pressed part and the columnar-shaped member, respectively; 
         FIGS. 8A and 8B  are diagrams showing still another configuration example of the pressed part and the columnar-shaped member, respectively; 
         FIG. 9  is a diagram showing another configuration example of the columnar-shaped member and the like; and 
         FIG. 10  is a diagram showing a configuration example in which a pressing part is moved and the pressing part is pressed against the moving unit. 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     Hereinafter, an exemplary embodiment according to the present invention will be described with reference to attached drawings. 
       FIG. 1  is a side elevational view of a printing apparatus  500 . 
     The printing apparatus  500  is provided with a can body supply part  510  to which can bodies  10  are supplied. In the can body supply part  510 , the can body  10  is supplied (attached) to a support member  20  supporting the can body  10 . 
     Specifically, the support member  20  is formed into a cylindrical shape and the support member  20  is inserted into the cylindrically-shaped can body  10 ; thereby the can body  10  is supplied to the support member  20 . 
     Further, the can body supply part  510  is provided with an inspection device  92 . 
     The inspection device  92  inspects whether or not the can body  10  is deformed. 
     More specifically, as shown in  FIG. 2  (a diagram illustrating the inspection device  92 ), the inspection device  92  is provided with a light source  92 A. 
     The light source  92 A is provided on one end portion side of the can body  10  and the light source  92 A emits laser light that proceeds in an axial direction of the can body  10  along the outer circumferential surface of the can body  10 . Further, on the other end portion side of the can body  10 , there is provided a light receiving part  92 B that receives laser light from the light source  92 A. 
     When a part of the can body  10  is deformed as indicated by the reference sign  3 A, the laser light is cut off and the light receiving part  92 B cannot receive the laser light. Consequently, deformation of the can body  10  is detected. 
     Then, in the exemplary embodiment, when it is determined by the inspection device  92  that the can body  10  does not satisfy predetermined conditions (when it is determined that the can body  10  is deformed), a discharge mechanism  93  (refer to  FIG. 1 ) discharges the can body  10  to the outside of the printing apparatus  500 . 
     The discharge mechanism  93  is, as shown in  FIG. 1 , disposed between the inspection device  92  and an inkjet printing part  700  (disposed on an upstream side of the inkjet printing part  700 ). 
     In the exemplary embodiment, before image formation by the inkjet printing part  700  is performed, a deformed can body  10  is discharged from the printing apparatus  500 . 
     In the discharge mechanism  93 , compressed air is supplied to the inside of the cylindrically-formed support member  20 , to move the can body  10  in the axial direction thereof (in the direction orthogonal to the page of  FIG. 1 ). 
     Further, the bottom portion (the closed end portion) of the can body  10  is sucked by a not-shown suction member. Then, by the suction member, the can body  10  is conveyed to the outside of the printing apparatus  500 ; thereby the can body  10  is discharged to the outside of the printing apparatus  500 . 
     On a downstream side of the discharge mechanism  93 , the inkjet printing part  700  is provided. 
     The inkjet printing part  700  forms an image on the can body  10  by use of the inkjet printing method, the can body  10  having moved from the upstream side. 
     Here, the image formation by the inkjet printing method refers to printing performed by ejecting ink from inkjet heads to attach the ink to the can body  10 . 
     In the image formation by the inkjet printing method, known methods can be used. Specifically, for example, a piezo system, a thermal (bubble) system, a continuous system or the like can be used. 
     On a downstream side of the inkjet printing part  700 , a light irradiation part  750  is provided as an example of a light irradiation unit. 
     The light irradiation part  750  includes a light source and irradiates the outer circumferential surface of the can body  10 , on which image formation by the inkjet printing part  700  has been performed, with light, to thereby cure the image formed on the outer circumferential surface. 
     In the inkjet printing part  700 , the image is formed by use of ultraviolet cure ink. To additionally describe, in the inkjet printing part  700 , the image is formed by use of actinic radiation cure ink. 
     In the light irradiation part  750 , the formed image is irradiated with light, such as ultraviolet light. This cures the image formed on the outer circumferential surface of the can body  10 . 
     Here, the inkjet printing part  700  and the light irradiation part  750  are disposed on a lateral side of a first linear part  810  (details thereof will be described later). 
     Further, in the exemplary embodiment, a plate printing part  760  and a protection layer forming part  770 , which are an example of a processing unit, are provided. 
     In the conveyance direction of the can bodies  10 , the plate printing part  760  is disposed on the downstream side of the inkjet printing part  700 . In the conveyance direction of the can bodies  10 , the protection layer forming part  770  is disposed on the downstream side of the plate printing part  760 . 
     The plate printing part  760  performs image formation onto the can body  10  by use of the plate printing method. 
     Specifically, the plate printing part  760  is provided with plural plate cylinders  451 . On the surface of the plate cylinder  451 , a convex portion (not shown) corresponding to an image to be formed by the plate printing is provided. In addition, the plate printing part  760  is provided with plural ink supply units  452  supplying ink to the convex portions of the plate cylinders  451 . 
     Further, the plate printing part  760  is provided with a blanket  453  to which the ink from the plate cylinders  451  is transferred and which transfers the ink to the can body  10 . 
     In the plate printing part  760 , the can body  10  stops at a position facing the blanket  453 . Further, the can body  10  rotates in the circumferential direction. 
     Moreover, in the plate printing part  760 , ink is supplied from the ink supply units  452  to the surfaces of the respective corresponding plate cylinders  451 . Then, the ink adhered to the surfaces of the plate cylinders  451  (the ink adhered to the convex portions of the plate cylinders  451 ) is transferred to the blanket  453 . Further, the ink transferred to the blanket  453  is transferred to the rotating can body  10 . Consequently, an image by the plate printing method is formed on the outer circumferential surface of the can body  10 . 
     Here, image formation by the plate printing method refers to image formation by use of plates. More specifically, the image formation by the plate printing method refers to image formation onto the can body  10  performed by attaching ink to the plates and then transferring the ink adhered to the plates to the can body  10 . 
     Note that the transfer may be performed by bringing the plates and the can body  10  into direct contact, or an intermediate transfer body, such as the blanket  453 , may be disposed between the plates and the can body  10 , to thereby perform the transfer onto the can body  10 . 
     Here, examples of printing by the plate printing method include relief printing, intaglio printing, planographic printing and stencil printing, and any of these may be used in printing by the plate printing method. Note that, in the exemplary embodiment, image formation onto the can body  10  is performed by use of the relief printing. 
     The protection layer forming part  770  is disposed on the downstream side of the plate printing part  760 . 
     The protection layer forming part  770  forms a transparent layer covering an image formed by the inkjet printing part  700  or an image formed by the plate printing part  760 . Consequently, in the exemplary embodiment, a transparent protection layer is formed as the outermost layer of the can body  10 . 
     Here, the protection layer forming part  770  is provided with a contact member  771  formed into a cylindrical shape or a columnar shape, and brought into contact with the outer circumferential surface of the can body  10 . 
     After the can body  10  is supplied to the position facing the contact member  771 , the contact member  771  moves toward the can body  10  to be brought into contact with the can body  10 . More specifically, as indicated by the arrow  1 A in the figure, the contact member  771  moves in the obliquely upward direction to be brought into contact with the can body  10 . 
     Moreover, the protection layer forming part  770  is provided with a paint container part  772  containing paint. Further, the protection layer forming part  770  is provided with a supply member  773  formed into a cylindrical shape or a columnar shape and supplying the paint in the paint container part  772  to the contact member  771 . 
     In the protection layer forming part  770 , the can body  10  rotates in the circumferential direction. Moreover, the paint is supplied to the outer circumferential surface of the contact member  771  by the supply member  773 . Consequently, in the exemplary embodiment, the paint adheres to an entire region of the outer circumferential surface in the circumferential direction of the can body  10 . 
     On the downstream side of the protection layer forming part  770 , a detachment part  780  detaching the can body  10  from the support member  20  is provided. In the exemplary embodiment, the can body  10  is detached from the support member  20  in the detachment part  780  to be discharged to the outside of the printing apparatus  500 . 
     Further, the printing apparatus  500  is provided with plural moving units  550  as an example of moving bodies that move while supporting the can bodies  10 . 
     In the exemplary embodiment, the above-described support member  20  supporting the can body  10  is attached to the moving unit  550 , and the can body  10  moves together with the moving unit  550 . 
     Here, the can body  10  is formed into a cylindrical shape and an opening portion is provided to one end thereof. Moreover, the other end of the can body  10  is closed and the other end is provided with a bottom portion  10 A. The support member  20  is inserted into the can body  10  from the opening portion. 
     Further, in the exemplary embodiment, a moving mechanism  560  that functions as a mover unit that moves the moving units  550 . The moving mechanism  560  is provided with an annular-shaped guidance member  561  that guides the moving units  550 . 
     Each of the moving units  550  is guided by the guidance member  561  and orbitally moves along a predetermined annular-shaped movement route  800 . 
     With this, in the exemplary embodiment, the support member  20  provided to the moving unit  550  and the can body  10  supported by the support member  20  also move along the predetermined annular-shaped movement route  800 . 
     The movement route  800  is disposed so that the axial center  800 C thereof is arranged along the horizontal direction. To put it another way, the movement route  800  is disposed around the axial center  800 C along the horizontal direction. Here, the axial center  800 C extends in the direction orthogonal to the page in  FIG. 1 . 
     In this case, in the exemplary embodiment, the support member  20  and the can body  10  orbitally move around the axial center  800 C extending in the direction orthogonal to the page in the figure. 
     The movement route  800  is provided with the first linear part  810 , which is a linear movement route, and a second linear part  820 , which is similarly a linear movement route. 
     Each of the first linear part  810  and the second linear part  820  is disposed to extend along the horizontal direction. Moreover, the first linear part  810  and the second linear part  820  are disposed to be substantially in parallel with each other. Further, in the exemplary embodiment, the first linear part  810  is disposed above the second linear part  820 . 
     Further, the first linear part  810  is provided to an uppermost portion of the annular-shaped movement route  800 , whereas the second linear part  820  is provided to a lowermost portion of the annular-shaped movement route  800 . 
     Further, in the exemplary embodiment, the inkjet printing part  700  is provided above the first linear part  810  positioned at the uppermost portion. 
     Further, the movement route  800  is provided with a first curved part  830  and a second curved part  840 , each of which is formed into an arc with a curvature. 
     The first curved part  830  connects a right end portion of the first linear part  810  in the figure and a right end portion of the second linear part  820  in the figure. In addition, the first curved part  830  is formed to head downward from above. 
     Moreover, the second curved part  840  connects a left end portion of the first linear part  810  in the figure and a left end portion of the second curved part  820  in the figure. In addition, the second curved part  840  is formed to head upward from below. 
     In the exemplary embodiment, the plate printing part  760  and the protection layer forming part  770  are provided on a lateral side of the first curved part  830  (a portion of the movement route  800  with a curvature). 
     To put it another way, the plate printing part  760  and the protection layer forming part  770  are provided on a lateral side of a portion of the movement route  800  heading downward from above. 
     In the exemplary embodiment, printing by the plate printing method and formation of the protection layer are performed on the can body  10  positioned at the first curved part  830 . 
     Provision of the plate printing part  760  and the protection layer forming part  770  on a lateral side of the first curved part  830  (the portion of the movement route  800  heading downward from above or heading upward from below) makes it possible to downsize the printing apparatus  500 . 
     Specifically, it is possible to downsize the printing apparatus  500  as compared to the case where these are provided above the first linear part  810 . More specifically, the size of the printing apparatus  500  in the horizontal direction (the direction indicated by the arrow  1 B in  FIG. 1 ) can be reduced. 
     Here, in the case where the plate printing part  760  and the protection layer forming part  770  are further provided above the first linear part  810 , it becomes necessary to extend the first linear part  810  than the state shown in  FIG. 1 ; therefore, the printing apparatus  500  is upsized. 
     Further, in the exemplary embodiment, the can body supply part  510  is provided to a portion on an upper side of the annular-shaped movement route  800  (a portion positioned at the upper side of the horizontal line H passing the axial center  800 C, hereinafter referred to as “upper-side portion”). 
     Moreover, the detachment part  780  is provided to a portion on a lower side of the annular-shaped movement route  800  (a portion positioned at the lower side of the horizontal line H, hereinafter referred to as “lower-side portion”). 
     This makes it possible to reduce the size of the printing apparatus  500  in the horizontal direction (the direction indicated by the arrow  1 B in  FIG. 1 ) as compared to the case where both the can body supply part  510  and the detachment part  780  are provided only at one of the upper-side portion and the lower-side portion. 
     Note that, in the exemplary embodiment, description has been given of the case where the can body supply part  510  was provided to the upper-side portion and the detachment part  780  was provided to the lower-side portion; however, the present invention is not limited thereto, and it may be possible to provide the can body supply part  510  to the lower-side portion and the detachment part  780  to the upper-side portion. 
     More specifically, for example, in the case where the inkjet printing part  700  is provided to the second linear part  820  or the like, it may be possible to provide the can body supply part  510  to the lower-side portion and the detachment part  780  to the upper-side portion. 
     Moreover, in the exemplary embodiment, description has been given of the case, as an example, where the plate printing part  760  and the protection layer forming part  770  were provided on the lateral side of the first curved part  830 . However, the present invention is not limited thereto, and, for example, it may be possible to provide the plate printing part  760  on the lateral side of the first curved part  830  and to provide the protection layer forming part  770  on the lateral side of the second curved part  840 . 
     Note that, in this case, the detachment part  780  is provided to a portion indicated by the reference sign  1 C (on the downstream side of the protection layer forming part  770 ). 
     Moreover, as in the exemplary embodiment, provision of the protection layer forming part  770  on the lateral side of the first curved part  830  (the portion of the movement route  800  heading downward from above or heading upward from below) makes it possible to downsize a mechanism for moving the contact member  771 . 
     In the exemplary embodiment, as described above, the contact member  771  is moved to be brought into contact with the can body  10 . 
     In this case, if the contact member  771  exists below the second linear part  820 , it becomes necessary to move the contact member  771  straight up. The case leads to upsizing of a driving source, and thereby the moving mechanism moving the contact member  771  is likely to be upsized. 
     In contrast thereto, as in the exemplary embodiment, provision of the protection layer forming part  770  on the lateral side of the first curved part  830  eliminates the need to move the contact member  771  straight up. 
     In this case, the driving source or the like can be small, and thereby the moving mechanism moving the contact member  771  can be downsized. Then, the moving mechanism can be downsized, it becomes also possible to downsize the entire printing apparatus  500 . 
     Next, the inkjet printing part  700  will be described. 
     The inkjet printing part  700  is disposed above the first linear part  810  to perform image formation onto the can body  10  positioned at the first linear part  810 . 
     The inkjet printing part  700  is provided with plural inkjet heads  11  arranged in line in the left and right directions in the figure. The portion where the plural inkjet heads  11  are provided can be grasped as an image forming unit that performs image formation onto the can body  10 . 
     Specifically, the inkjet printing part  700  is provided with a first inkjet head  11 C ejecting cyan ink, a second inkjet head  11 M ejecting magenta ink, a third inkjet head  11 Y ejecting yellow ink and a fourth inkjet head  11 K ejecting black ink. 
     In the following description, when the first inkjet head  11 C to the fourth inkjet head  11 K are not particularly distinguished, the inkjet heads are simply referred to as “inkjet heads  11 .” 
     Here, the four inkjet heads  11 , namely, the first inkjet head  11 C to the fourth inkjet head  11 K perform image formation onto the can body  10  by use of the ultraviolet cure ink. Moreover, in the exemplary embodiment, the can body  10  is moved in a state of being laid (the can body  10  is moved in the state in which the axial direction of the can body  10  extends along the horizontal state), and a part of the outer circumferential surface of the can body  10  faces upward in the vertical direction. In the exemplary embodiment, ink is ejected downwardly from above the outer circumferential surface, to thereby perform image formation onto the outer circumferential surface of the can body  10 . 
     Further, in the exemplary embodiment, the four inkjet heads  11  are arranged in line along the moving direction of the can body  10 . Moreover, each of the four inkjet heads  11  is disposed along a direction orthogonal to (intersecting) the moving direction of the can body  10 . 
     In the exemplary embodiment, in a process in which the can body  10  passes through below the four inkjet heads  11 , ink is ejected to the can body  10  from above, and thereby an image is formed on the can body  10 . 
     More specifically, in the exemplary embodiment, the moving unit  550  stops at the installation location of each of the plural inkjet heads  11  that have been provided. Then, in each of the inkjet heads  11 , ink is ejected onto the can body  10 , to thereby form an image onto the can body  10 . Note that, when the image formation is performed in each of the inkjet heads  11 , the can body  10  rotates in the circumferential direction. 
     Note that, in the exemplary embodiment, the case in which the four inkjet heads  11  were provided was shown as an example; however, an inkjet head  11  ejecting ink of a special color, such as a corporate color, or an inkjet head  11  for forming a white underlayer may be provided further. 
     Each of the moving units  550 , as an example of a moving body, moves at a predetermined moving speed. Moreover, each of the moving units  550  stops at each of the can body supply part  510 , the discharge mechanism  93 , below each of the inkjet heads  11 , the light irradiation part  750 , the plate printing part  760 , the protection layer forming part  770  and the detachment part  780 . 
     Moreover, at each of the inkjet heads  11 , the light irradiation part  750 , the plate printing part  760 , the protection layer forming part  770  and the like, the can body  10  on the moving unit  550  rotates in the circumferential direction at the predetermined rotation speed. 
     In addition, in the printing apparatus  500  of the exemplary embodiment, the moving units  550  of the number larger than the number of can bodies  10  positioned in the printing apparatus  500  are installed. Further, the moving units  550  move around the axial center  800 C. 
     The moving mechanism  560  is provided with an annular-shaped guidance member  561  that guides the moving units  550 . Inside the guidance member  561 , electromagnets (not shown) are provided. 
     Further, in the moving unit  550 , a permanent magnet (not shown) is installed. 
     In the exemplary embodiment, a linear-motor mechanism is used to move the moving units  550 . 
     More specifically, the printing apparatus  500  of the exemplary embodiment is provided with a control part (not shown) and energization to the above-described electromagnets is controlled, to thereby generate magnetic fields for moving each of the moving units  550 . Note that the control part is composed of a program-controlled CPU (Central Processing Unit) and the like. 
     As shown in  FIG. 1 , the moving unit  550  is provided with a pedestal part  551  guided by the guidance member  561 . In the pedestal part  551 , the permanent magnet (not shown) is installed. 
     In the exemplary embodiment, a propulsive force occurs in the moving unit  550  by magnetic fields generated by electromagnets provided to the guidance member  561  and the permanent magnet provided to the pedestal part  551  of the moving unit  550 , and thereby the moving unit  550  moves along the annular-shaped movement route  800 . 
     Further, the moving unit  550  of the exemplary embodiment is provided with the cylindrical support member  20  supporting the can body  10  and a fixing member  553  for fixing the support member  20  to the pedestal part  551 . The fixing member  553  is provided in the shape of standing from the pedestal part  551 . 
     The support member  20  of the exemplary embodiment is formed into the cylindrical shape, and inserted into the can body  10  through the opening portion formed in the can body  10  to support the can body  10 . In addition, the support member  20  is disposed in the state of being laid (along the horizontal direction). Consequently, in the exemplary embodiment, the can body  10  is also disposed in the state of being laid. 
     In the exemplary embodiment, when the can body  10  reaches each of the inkjet heads  11 , ink is ejected from each of the inkjet heads  11  to the can body  10  positioned below. Consequently, an image is formed on the outer circumferential surface of the can body  10 . 
     The light irradiation part  750  is disposed on the downstream side of the inkjet printing part  700  and irradiates the can body  10  with the ultraviolet light being an example of light. Consequently, the image formed on the outer circumferential surface of the can body  10  (the image formed by the inkjet printing part  700 ) is cured. 
     Note that, when image formation onto the can body  10  is performed, thermosetting ink may also be used; in this case, for example, a heat source, not a light source, is installed at the location where the light irradiation part  750  is provided. 
     In the exemplary embodiment, the moving unit  550  stops every time the moving unit  550  reaches below each of the inkjet heads  11 . In other words, the moving unit  550  stops at each of predetermined stop locations. 
     Then, in the exemplary embodiment, onto the outer circumferential surface of the can body  10  held by the moving unit  550  stopped at the predetermined stop location, an image is formed by the inkjet heads  11  as an example of the image forming unit. 
     More specifically, in each of the inkjet heads  11 , ejection of ink from the inkjet head  11  is performed in the state in which the support member  20  (the can body  10 ) rotates in the circumferential direction, to thereby form an image onto the outer circumferential surface of the can body  10 . 
     In the exemplary embodiment, when the support member  20  rotates 360° after ejection of ink is started, ejection of ink is stopped. Consequently, an image is formed on the entire region in the circumferential direction of the outer circumferential surface of the can body  10 . 
     In the exemplary embodiment, as shown in  FIG. 1 , the support member  20  is disposed along the direction orthogonal to the page of  FIG. 1 . To put it another way, the support member  20  is disposed to extend along the horizontal direction. 
     Moreover, the support member  20  is disposed along the direction orthogonal to (intersecting) the moving direction of the moving unit  550 . 
     In this case, as compared to the case in which the support member  20  is disposed along the moving direction of the moving unit  550 , it is possible to reduce the length (the length in the direction indicated by the arrow  1 B in  FIG. 1 ) or the height of the printing device  500 . Moreover, in this case, it is possible to reduce the full length of the movement route  800  on which the moving unit  550  moves. 
     Moreover, when the support member  20  is disposed along the direction orthogonal to the moving direction of the moving unit  550 , as compared to the case in which the support member  20  is disposed along the moving direction of the moving unit  550 , it is possible to increase the disposition density of the moving units  550  in the moving direction of the moving unit  550 . 
     Then, in this case, it is possible to increase the number of moving units  550  that can be installed to the printing apparatus  500 . 
     Further, in the exemplary embodiment, on the outside of the movement route  800  in the radial direction, the functional parts, such as the inkjet printing part  700 , the light irradiation part  750 , the plate printing part  760 , the protection layer forming part  770  and the like are installed. 
     There are some cases of performing maintenance of the functional parts; in such cases, when the functional parts are disposed outside of the movement route  800 , maintenance is performed with ease as compared to a case in which the functional parts are disposed inside the movement route  800 . 
     Moreover, in the exemplary embodiment, the inkjet heads  11  are positioned above the can body  10 , and the ink is ejected to the can body  10  from above. 
     In this case, as compared to a case in which the inkjet heads  11  are disposed at the lateral side of the can body  10  or below the can body  10 , it is possible to reduce the effect of gravity acting on ink droplets ejected from the inkjet heads  11 , to thereby increase accuracy of ink adhesive positions in the can body  10 . 
     Further, in the exemplary embodiment, the inkjet printing part  700  (the plural inkjet heads  11 ) is provided on the lateral side of (above) the first linear part  810 . 
     Consequently, as compared to the case in which the inkjet printing part  700  (the plural inkjet heads  11 ) is provided on the lateral side of the curved part (the first curved part  830  or the second curved part  840 ), quality of the image to be formed on the can body  10  is likely to be improved. 
     Here, in the case where the inkjet heads  11  are provided on the lateral side of the curved part, for example, as shown in  FIG. 3  (a diagram showing Comparative example of the printing apparatus  500 ), the attitudes of the inkjet heads  11  are different in each of the inkjet heads  11 . 
     In this case, as compared to the case where the attitudes of the inkjet heads  11  are the same, the quality of the image to be formed is likely to be degraded due to occurrence of misregistration among images formed by the respective inkjet heads  11 . 
     In contrast thereto, if the inkjet printing part  700  is provided on the lateral side of the linear part (the first linear part  810 ) as in the exemplary embodiment, the attitudes of the plural inkjet heads  11  are easily aligned, and thereby degradation of quality of the image to be formed can be suppressed. 
       FIG. 4  is a top view showing another configuration example of the printing apparatus  500 . 
     Note that, in  FIG. 4 , the inkjet printing part  700  is mainly shown, and illustration of constituents other than the inkjet printing part  700  is considerably omitted. 
     In the printing apparatus  500 , the axial center  800 C of the movement route  800  extends along the vertical direction. To put it another way, in the printing apparatus  500 , each of the moving units  550  (not shown in  FIG. 4 ) moves along the annular-shaped movement route  800  positioned on a horizontal plane. 
     Further, in the printing apparatus  500 , similar to the above, each of the inkjet heads  11  is provided on the lateral side of (above) the first linear part  810 . 
     In the configuration example, each of the inkjet heads  11  is also provided on the lateral side of the first linear part  810 ; in this case, similar to the above, the attitudes of the plural inkjet heads  11  are the same, and therefore, it is possible to suppress degradation of quality of the image to be formed. 
     In  FIG. 1 , the case in which the axial center  800 C of the movement route  800  extended along the horizontal direction was shown as an example; however, as shown in  FIG. 4 , the printing apparatus  500  may be configured so that the axial center  800 C of the movement route  800  extends along the vertical direction. 
     In this case, also, if the plural inkjet heads  11  are disposed on the lateral side of (above) the linear part, misregistration among images formed by the respective inkjet heads  11  is likely to be suppressed, and thereby degradation of quality of the image to be formed can be suppressed. 
       FIG. 5  is a diagram of a case in which the inkjet head  11 C and the moving unit  550  are viewed from the direction of an arrow V in  FIG. 1 . Note that, in  FIG. 5 , illustration of the pedestal part  551  (refer to  FIG. 1 ) provided to the moving unit  550  is omitted. 
     Though illustration was omitted in  FIG. 1 , in the exemplary embodiment, as shown in  FIG. 5 , each of the stop locations P, where the moving unit  550  stops, is provided with a pressed part  900  against which a part of the moving unit  550  that has stopped is pressed. 
     In the pressed part  900 , a permanent magnet  901  is installed. Further, each of the stop locations P is provided with a servomotor M that is a driving source to perform rotation control of the pressed part  900  by use of an encoder (not shown). Here, the driving source may be a stepping motor that performs rotation control by the pulse number. 
     On the other hand, the moving unit  550  is provided with a columnar-shaped member  559  attached to an end portion of the support member  20  that supports the can body  10 . The columnar-shaped member  559  is configured with a metal member, and the columnar-shaped member  559  of the exemplary embodiment is attracted by the permanent magnet  901 . 
     In the exemplary embodiment, the columnar-shaped member  559  can move with respect to the fixing member  553 , and therefore, the columnar-shaped member  559  can rotate in the circumferential direction. Further, the columnar-shaped member  559  can move in the axial direction of the columnar-shaped member  559 . 
     More specifically, the columnar-shaped member  559  is disposed inside a through hole  553 A formed in the fixing member  553  with a gap, and thereby the columnar-shaped member  559  is supported by the fixing member  553  in the state capable of rotating in the circumferential direction and moving in the axial direction. 
     In the exemplary embodiment, when the moving unit  550  stops at each of the predetermined stop locations P, the columnar-shaped member  559  is attracted by the permanent magnet  901  provided to the pressed part  900 . 
     This presses the columnar-shaped member  559  to the pressed part  900  to perform positioning of the support member  20  in the longitudinal direction of the support member  20 . In other words, positioning of the can body  10  in the axial direction of the can body  10  is performed. 
     To additionally describe, in the exemplary embodiment, a part of the moving unit  550  is biased by a magnetic force toward the side where the pressed part  900  is provided, and thereby the part is pressed against the pressed part  900 . 
     To put it another way, in the exemplary embodiment, the support member  20  supporting the can body  10  is pressed against the pressed part  900  via the columnar-shaped member  559  by the magnetic force. 
     Consequently, in the exemplary embodiment, the can body  10  is positioned to a predetermined location blow the first inkjet head  11 C. More specifically, positioning of the can body  10  in the axial direction of the can body  10  is performed. 
     Here, the permanent magnet  901  and the like can be grasped as a biasing unit that biases the part to be pressed against the pressed part  900  toward the side where the pressed part  900  is provided. 
     Note that, in the exemplary embodiment, the permanent magnet  901  was provided to the pressed part  900  side; however, the permanent magnet  901  may be provided to the columnar-shaped member  559  side or may be provided to both the pressed part  900  and the columnar-shaped member  559 . 
     Moreover, the electromagnet, not the permanent magnet  901 , may be used. 
     Moreover, biasing of the columnar-shaped member  559  toward the pressed part  900  may not be limited to the magnetic force, but may be performed by other methods. 
     For example, biasing of the columnar-shaped member  559  toward the pressed part  900  may be performed by reducing pressure on the side where the pressed part  900  is provided, to thereby attract the part of the moving unit  550 . 
     Moreover, for example, biasing of the columnar-shaped member  559  toward the pressed part  900  may be performed by pressing the moving unit  550  and/or the can body  10  toward the pressed part  900  side. 
     Further, in the exemplary embodiment, at the stop location P, positioning of the can body  10  in the radial direction is also performed, the can body  10  being held by the moving unit  550 . To additionally describe, positioning of the support member  20  in the radial direction of the support member  20  is also performed. 
     Further, in the exemplary embodiment, at the stop location P, the phase of the can body  10  (the columnar-shaped member  559  and the support member  20 ) with respect to the pressed part  900  as an example of a rotation body becomes a predetermined phase. 
     To additionally describe, in the exemplary embodiment, when the columnar-shaped member  559  is pressed against the pressed part  900 , the phase of the columnar-shaped member  559  with respect to the pressed part  900  becomes the predetermined phase. 
     To describe further, in the exemplary embodiment, when the columnar-shaped member  559  is pressed against the pressed part  900 , positioning of the columnar-shaped member  559  also being positioning of the pressed part  900  in the rotation direction (the circumferential direction) is performed. 
     Consequently, in the exemplary embodiment, the phase of the columnar-shaped member  559  with respect to the pressed part  900  becomes a predetermined phase. 
     To additionally describe, in the exemplary embodiment, when the columnar-shaped member  559  is pressed against the pressed part  900 , the phase of the columnar-shaped member  559  with respect to the pressed part  900  does not become any phase other than the single predetermined phase. 
     In the exemplary embodiment, when the columnar-shaped member  559  is pressed against the pressed part  900 , in each of the axial direction of the pressed part  900  and the radial direction of the pressed part  900 , the position of the columnar-shaped member  559  is adjusted to perform positioning of the columnar-shaped member  559 . 
     Further, in the exemplary embodiment, the rotation angle of the columnar-shaped member  559  in the circumferential direction of the pressed part  900  is adjusted, and thereby the phase (the rotation angle) of the columnar-shaped member  559  with respect to the pressed part  900  becomes the predetermined single phase (the rotation angle). 
     In the exemplary embodiment, when the positioning of the columnar-shaped member  559  is performed, the can body  10  comes to be positioned directly below the inkjet head  11 C. Moreover, the longitudinal direction of the inkjet head  11 C and the axial direction of the can body  10  extend in parallel with each other. 
     Further, when the positioning of the columnar-shaped member  559  is performed, the can body  10  is disposed at a predetermined location in the longitudinal direction of the inkjet head  11 C. 
       FIGS. 6A and 6B  are diagrams illustrating the pressed part  900  and the columnar-shaped member  559 , respectively. More specifically,  FIG. 6A  is a diagram in the case where the pressed part  900  is viewed from the direction of the arrow VIA in  FIG. 5 , and  FIG. 6B  is a diagram in the case where the columnar-shaped member  559  is viewed from the direction of the arrow VIB in  FIG. 5 . 
     As shown in  FIG. 6A , in the exemplary embodiment, a circular facing surface  908  of the pressed part  900  is provided with a concave portion  908 A, the facing surface  908  facing the columnar-shaped member  559 . Further, on the facing surface  908 , the permanent magnet  901  is installed. 
     Moreover, as shown in  FIG. 6B , a facing surface  559 A of the columnar-shaped member  559  is provided with a convex portion  559 B to be inserted into the concave portion  908 A, the facing surface  559 A facing the facing surface  908  of the pressed part  900 . 
     The concave portion  908 A is positioned at a location deviated from the rotation axis (the rotation center)  900 C of the pressed part  900 , and is formed to extend along the radial direction of the pressed part  900 . 
     The convex portion  559 B is also positioned at a location deviated from the rotation axis  559 C of the columnar-shaped member  559 . Further, the convex portion  559 B is also disposed to extend along the radial direction of the columnar-shaped member  559 . 
     In the exemplary embodiment, when the rotation angle of the columnar-shaped member  559  with respect to the pressed part  900  (the relative rotation angle) reaches a predetermined rotation angle, the convex portion  559 B is inserted into the concave portion  908 A. 
     Consequently, in the exemplary embodiment, the columnar-shaped member  559  is pressed against the pressed part  900  in the state where the phase of the columnar-shaped member  559  with respect to the pressed part  900  is the predetermined phase. 
     Then, in this case, the can body  10  supported by the support member  20  also comes to be disposed with the predetermined phase with respect to the pressed part  900 . 
     Here, the pressed part  900  including the concave portion  908 A and the columnar-shaped member  559  including the convex portion  559 B can be grasped as a phase adjustment unit setting the phase of the can body  10  with respect to the pressed part  900  at the predetermined phase. 
     Further, in the exemplary embodiment, the convex portion  559 B is inserted into the concave portion  908 A, to thereby perform positioning of the columnar-shaped member  559  in the radial direction of the pressed part  900 . In other words, positioning of the can body  10  in the radial direction of the can body  10  is performed. 
     Here, the pressed part  900  including the concave portion  908 A and the columnar-shaped member  559  including the convex portion  559 B can be grasped as a positioning unit performing positioning of the can body  10  in the radial direction of the can body  10 . 
     Further, in the exemplary embodiment, when the convex portion  559 B is inserted into the concave portion  908 A, the facing surface  908  and the facing surface  559 A butt against each other. Consequently, in the exemplary embodiment, positioning of the can body  10  in the axial direction of the can body  10  is also performed. 
     Note that, as shown in  FIGS. 7A and 7B  (the diagrams showing another configuration example of the pressed part  900  and the columnar-shaped member  559 , respectively), the concave portion  908 A and the convex portion  559 B may be provided on the rotation axes included in the pressed part  900  and the columnar-shaped member  559 , respectively (the rotation axis  900 C and the rotation axis  559 C). 
     In the configuration example, the shape of the convex portion  559 B and the concave portion  908 A viewed from the front is an isosceles triangle. In the configuration example, similar to the above, when the rotation angle of the columnar-shaped member  559  with respect to the pressed part  900  reaches a predetermined rotation angle, the convex portion  559 B is also inserted into the concave portion  908 A. 
     Then, when the convex portion  559 B is inserted into the concave portion  908 A, similar to the above, positioning of the can body  10  in the radial direction of the can body  10  and positioning of the can body  10  in the axial direction of the can body  10  are performed. 
     Further, the phase of the can body  10  with respect to the pressed part  900  becomes a predetermined phase. 
     Note that, in the exemplary embodiment, when the above-described positioning of the can body  10  (the columnar-shaped member  559 ) is performed, the columnar-shaped member  559  is caused to approach the pressed part  900  by use of the magnetic force in the state of rotating the pressed part  900 . 
     Then, the convex portion  559 B and the concave portion  908 A are brought into the state of facing each other, the convex portion  559 B is inserted into the concave portion  908 A, to thereby perform the above-described positioning. 
     Thereafter (after the positioning), in the exemplary embodiment, ink ejection from the inkjet head  11 C is performed in the state where the pressed part  900  is rotated at a predetermined number of rotations. Consequently, an image is formed on the outer circumferential surface of the can body  10 . 
     In the exemplary embodiment, the pressed part  900  is disposed coaxially with the columnar-shaped member  559  that is rotated by the pressed part  900 , and thereby the columnar-shaped member  559  is also rotated when the pressed part  900  is rotated. Consequently, the can body  10  rotates in the circumferential direction. 
     To additionally describe, in the exemplary embodiment, the rotational driving force from the servomotor M is transmitted to the moving unit  550  side via the pressed part  900  and the columnar-shaped member  559 , and therefore, the can body  10  in the moving unit  550  rotates in the circumferential direction. 
     To describe further, in the exemplary embodiment, the pressed part  900  is disposed coaxially with the can body  10  held by the moving unit  550  stopped at the stop location P. 
     Then, in the exemplary embodiment, when the pressed part  900  is rotated, the rotational driving force from the pressed part  900  is transmitted to the can body  10  via the columnar-shaped member  559  and the support member  20 , and thereby the can body  10  rotates in the circumferential direction. 
     To describe further, as shown in  FIG. 5 , the pressed part  900  of the exemplary embodiment is disposed coaxially with the can body  10 , and further, disposed on the opening portion  10 A side included in the can body  10 . 
     Then, in the exemplary embodiment, when the pressed part  900  is rotated, the support member  20  inserted into the can body  10  through the opening portion  10 A is rotated; with this, the can body  10  rotates in the circumferential direction. 
       FIGS. 8A and 8B  are diagrams showing still another configuration example of the pressed part  900  and the columnar-shaped member  559 , respectively. 
     In the configuration example, as shown in  FIGS. 8A and 8B , there are provided a convex portion  559 B projecting in the radial direction of the columnar-shaped member  559  and a concave portion  908 A recessed in the radial direction of the pressed part  900 . 
     More specifically, in the configuration example shown in  FIGS. 8A and 8B , a columnar-shaped projecting portion  559 X projecting in the axial direction from the facing surface  559 A of the columnar-shaped member  559  is provided, and the convex portion  559 B is projecting from the outer circumferential surface of the projecting part  559 X. 
     Moreover, regarding the pressed part  900  side, a concave portion  908 X having a circular cross section and recessed in the axial direction of the pressed part  900  is provided, and the concave portion  908 A is provided on the inner circumferential surface of the concave portion  908 X. 
     In the configuration example, similar to the above, the facing surface  908  of the pressed part  900  and the facing surface  559 A of the columnar-shaped member  559  butt against each other, and thereby positioning of the can body  10  in the axial direction of the can body  10  is performed. 
     Moreover, the columnar-shaped projecting portion  559 X of the columnar-shaped member  559  is inserted into the circular concave portion  908 X of the pressed part  900 , and thereby positioning of the can body  10  in the radial direction of the can body  10  is performed. 
     In addition, the convex portion  559 B of the columnar-shaped member  559  is inserted into the concave portion  908 A of the pressed part  900 , and thereby the phase of the can body  10  with respect to the pressed part  900  becomes a single predetermined phase. 
     Note that, in the above, the concave portions, such as the concave portion  908 A and the concave portion  908 X, were provided on the pressed part  900  side, and the convex portions, such as the convex portion  559 B and the projecting portion  559 X, were provided on the columnar-shaped member  559  side; however, it may be possible to provide the convex portions on the pressed part  900  side and the concave portions on the columnar-shaped member  559  side. 
     With reference to  FIG. 5  again, a retracting mechanism  789  will be described. 
     In the exemplary embodiment, as shown in  FIG. 5 , a retracting mechanism  789  retracting the columnar-shaped member  559  from the pressed part  900  is provided. 
     When the processing at the stop location P is completed, in accordance with a signal from the control part, the retracting mechanism  789  is driven. Consequently, the columnar-shaped member  559  is retracted from the pressed part  900 , and thereby the columnar-shaped member  559  is separated from the pressed part  900 . Thus, further movement of the moving unit  550  on the downstream side becomes possible. 
     The retracting mechanism  789  is provided with a moving member  781  moving along the axial direction of the pressed part  900  to press the columnar-shaped member  559 . Moreover, there is provided a moving mechanism (not shown) causing the moving member  781  to move toward the columnar-shaped member  559 . 
     Note that the moving mechanism is configured by use of a known mechanism. Specifically, the moving mechanism is provided with a driving source, such as a motor, an air cylinder and a solenoid, and by using the driving force generated in the driving source, the moving member  781  is moved. 
     In the printing apparatus  500  of the exemplary embodiment, the attitudes of the moving units  550  when the moving units  550  are stopped are likely to differ by each of the moving units  550 . 
     In particular, as in the exemplary embodiment, with the configuration in which the moving units  550  individually move, the attitudes of the moving units  550  are likely to differ. In this case, quality of the image formed on the can body  10  can hardly be stable. 
     In contrast thereto, in the configuration of the exemplary embodiment, each of the moving units  550  is pressed against the pressed part  900 , which is a common member, and therefore, differences in attitudes of the moving units  550  on a one-by-one basis are less likely to occur. 
     This makes the quality of the image to be formed on each of the can bodies  10  stable. 
     Moreover, in the exemplary embodiment, the moving unit  550  is not provided with a motor for rotating the columnar-shaped member  559  (the can body  10 ); the columnar-shaped member  559  is rotated by the servomotor M provided to the main body side of the printing apparatus  500 . 
     Consequently, the moving unit  550  can be made light, and therefore, vibrations of the printing apparatus  500  caused by movement of the moving units  550  are reduced. 
     Here, if the moving unit  550  is provided with the motor for rotating the can body  10  and thereby the moving unit  550  has a large weight, vibrations of the printing apparatus  500  when the moving units  550  are stopped are likely to be increased. Then, in this case, the inkjet heads  11  and the like vibrate, to thereby lead to degradation of image quality. 
     In contrast thereto, as in the exemplary embodiment, in the configuration in which the motor is provided to the main body side of the printing apparatus  500 , the moving unit  550  is made lighter in weight, and thereby vibrations of the printing apparatus  500  when the moving units  550  are stopped are reduced. 
     Moreover, in the exemplary embodiment, in each of the inkjet heads  11  and the like, printing may be started when the rotation angle of the servomotor M reaches a predetermined angle; therefore, registration of images formed by respective colors can be performed easier. 
     More specifically, in the exemplary embodiment, as described above, the can body  10  is disposed in the state where the rotation angle of the can body  10  with respect to the pressed part  900  reaches the single predetermined angle at each of the stop locations P. 
     For this reason, when the rotation angle (the phase) of the pressed part  900  is the predetermined rotation angle (when the rotation angle of the servomotor M is the predetermined rotation angle), the can body  10 , which is a printing target, is also disposed at the predetermined rotation angle. 
     Then, in this case, as described above, if the printing is started when the rotation angle of the servomotor M reaches the predetermined angle, registration of images formed by respective colors is naturally performed. 
       FIG. 9  is a diagram showing another configuration example of the columnar-shaped member  559  and the like. Note that, with regard to the members having functions similar to those in the above, same reference signs are given and detailed descriptions thereof will be omitted. 
     In the configuration example shown in  FIG. 9 , there is provided a rotation member  988  including the permanent magnet  901  and the concave portion  908 A. The rotation member  988  is, similar to the above, rotated by the servomotor M. In the configuration example, the rotation member  988  attracts the columnar-shaped member  559  having the convex portion  559 B. 
     Moreover, in the configuration example, a positioning member  989  functioning as the pressed part is provided closer to the columnar-shaped member  559  side than the rotation member  988 . In the exemplary embodiment, a part of the columnar-shaped member  559  attracted by the rotation member  988  is pressed against the positioning member  989 . 
     More specifically, an annular-shaped projecting portion  559 D is provided on the outer circumferential surface of the columnar-shaped member  559 , and the projecting portion  559 D is pressed against the positioning member  989 . 
     In the configuration example, similar to the above, the positioning of the columnar-shaped member  559  in the radial direction of the columnar-shaped member  559  and the positioning of the columnar-shaped member  559  in the circumferential direction of the columnar-shaped member  559  are performed by the concave portion  908 A provided to the rotation member  988  and the convex portion  559 B provided to the columnar-shaped member  559 . 
     In addition, in the configuration example, the positioning of the columnar-shaped member  559  in the axial direction thereof is performed by butting of the projecting portion  559 D of the columnar-shaped member  559  against the positioning member  989 . 
     Note that, in the above, description was given of the case where the columnar-shaped member  559  was biased in the axial direction of the can body  10 ; however, the columnar-shaped member  559  and the support member  20  may be biased in the radial direction of the can body  10  to press these members against the pressed part  900 . 
     Moreover, in the above, description was given of the case where a part of the moving unit  550  was pressed against the pressed part  900 ; however, a part of the can body  10  may be pressed against the pressed part  900 . Moreover, both the moving unit  550  and the can body  10  may be pressed against the pressed part  900 . 
     Further, in the above, a part of the moving unit  550  is moved with respect to the pressed part  900  in the static state; however, it may be possible to provide a movable pressing part and press the pressing part against the moving unit  550  and/or the can body  10 , to thereby perform positioning of the can body  10 . 
       FIG. 10  is a diagram showing a configuration example in which a pressing part  992  is moved and the pressing part  992  is pressed against the moving unit  550 . Note that, with regard to the portions having functions similar to those in the above, same reference signs are given. 
     In the configuration example, for example, after the moving unit  550  is stopped below the inkjet heads  11 , the pressing part  992  in the rotating state is forwarded toward the columnar-shaped member  559 . 
     More specifically, the pressing part  992  in the state of keeping a predetermined attitude is forwarded toward the columnar-shaped member  559 . Then, a forwarding amount of the pressing part  992  reaches a predetermined forwarding amount, the pressing part  992  is stopped. 
     Consequently, in this case, the columnar-shaped member  559  is also brought into the state of being pressed against the pressing part  992 ; in this case, similar to the above, positioning of the can body  10  is also performed. 
     More specifically, in the configuration example, the moving unit  550  is provided with a biasing member  108 , such as a spring member, and therefore, the columnar-shaped member  559  is biased toward the pressing part  992 . 
     When the pressing part  992  is forwarded toward the columnar-shaped member  559 , the columnar-shaped member  559  is biased toward the pressing part  992  by the biasing member  108 . 
     When the columnar-shaped member  559  is brought into contact with the pressing part  992 , also in the configuration example, the convex portion  559 B of the columnar-shaped member  559  is inserted into the concave portion  908 A of the pressing part  992 . In addition, the facing surface  992 A of the pressed part  992  and the facing surface  559 A of the columnar-shaped member  559  butt against each other. 
     Consequently, in the configuration example, similar to the above, the positioning of the can body  10  in the axial direction thereof, the positioning of the can body  10  in the radial direction thereof and the positioning of the can body  10  in the circumferential direction thereof are also performed. 
     [Others] 
     In the above, the moving unit  550  is moved by using a so-called linear motor, but movement of the moving unit  550  is not limited to the linear motor; for example, the movement may be performed by attaching the moving unit  550  to an endless member (a member such as a belt) and orbitally moving the endless member. 
     Moreover, for example, it may be possible to provide a driving source, such as a motor, for moving the moving unit  550  to each of the moving units  550 , to thereby move the moving unit  550  autonomously. 
     Moreover, in the above, description was given to the case in which the pressed part  900  or the pressing part  992  was provided to the inkjet printing part  700 ; however, the pressed part  900  or the pressing part  992  is also provided to parts other than the inkjet printing part  700 . 
     Specifically, the pressed part  900  or the pressing part  992  is also provided to the can body supply part  510 , the light irradiation part  750 , the plate printing part  760 , the protection layer forming part  770  and the like. 
     Then, in each of the can body supply part  510 , the light irradiation part  750 , the plate printing part  760  and the protection layer forming part  770 , similar to the above, positioning of the can body  10  is performed, and the driving force is supplied from the pressed part  900  or the pressing part  992  to the can body  10 .