JP6018436B2 - Image forming apparatus and cylindrical body support member - Google Patents

Description

  The present invention relates to an image forming apparatus and a cylindrical body support member.

  Printing provided with a plurality of digital print heads fixed on the main body side of the apparatus and forming an image on the can body, and a drive mechanism for transporting the can body and rotating the can body at a position opposite to the digital print head An apparatus has been proposed (see, for example, Patent Document 1).

US Patent Application Publication No. 2007/0089619

When an image is formed on the outer peripheral surface of a cylindrical body such as a can, a support member is disposed inside the cylindrical body, and the support member may be rotated. By the way, in this case, the outer peripheral surface of the can may not pass a certain position, and the passing position of the outer peripheral surface may vary. In such a case, the quality of the formed image may be reduced.
An object of the present invention is to improve the quality of a formed image when an image is formed on a cylindrical body while rotating a support member that supports the cylindrical body from the inside.

  An image forming apparatus to which the present invention is applied is inserted into a cylindrical body, supports the cylindrical body from the inside, and rotates the cylindrical body in the circumferential direction, and the rotation member rotates the support member. An image forming unit that forms an image on the outer peripheral surface of the cylindrical body, and the support member is attached to the outer peripheral surface of the support member main body inserted into the cylindrical body, and the support member main body. A deformable member having a facing part facing the inner peripheral surface of the cylindrical body and deformably provided, and a deformation for deforming the deforming member so that the facing part faces the inner peripheral surface of the cylindrical body And an image forming apparatus.

Here, the deformation member may be arranged along a circumferential direction of the support member main body. In this case, a distance between the first part on the outer peripheral surface of the cylindrical body and the axis of the support member, and a second part located at a different location from the first part in the circumferential direction of the cylindrical body, It is possible to reduce the difference between the distance from the axis of the support member.
The deformable member may be formed in an annular shape. In this case, the inner peripheral surface of the cylindrical body can be supported by the deformable member over the entire circumference of the cylindrical body.
The deforming means may deform the deforming member after the support member main body is inserted into the cylindrical body. In this case, when the support member main body is inserted into the cylindrical body, it is possible to prevent the inner peripheral surface of the cylindrical body and the deformation member from coming into contact with each other.
A plurality of the deformable members may be provided, and the plurality of deformable members may be provided such that positions of the support member main body in the axial direction are different from each other. In this case, it is possible to suppress the passage position of the outer peripheral surface of the cylindrical body from varying at the time of rotation of the cylindrical body at different locations in the axial direction of the support member body.
Further, in a space located between the deforming members adjacent to each other among the plurality of deformable members, and located between the inner peripheral surface of the cylindrical body and the outer peripheral surface of the support member main body. The apparatus may further include supply means for supplying air. In this case, it is possible to improve the quality of a formed image formed in a portion of the cylindrical body located between the deforming members adjacent to each other.

  From another point of view, an image forming apparatus to which the present invention is applied is inserted into a cylindrical body, supports the cylindrical body from the inside, and rotates the cylindrical body in the circumferential direction; An image forming unit that forms an image on an outer peripheral surface of the cylindrical body rotated by a support member, the support member being inserted into the cylindrical body, and the support member main body A deformable member that is provided so as to be wound around the support member body and is provided so as to be wound around the support member main body, and a deformable member that deforms the deformable member so that an outer diameter of the deformable member is increased. And an image forming apparatus.

Here, the support member body is formed so that a cross-sectional shape of an outer peripheral surface thereof is a circle, and the deformation member is disposed along a circumferential direction of the support member body and is formed in an annular shape. Can be characterized. In this case, the inner peripheral surface of the cylindrical body can be supported by the deformable member over the entire circumference of the cylindrical body.
The deformable member is disposed along the circumferential direction of the support member main body and is formed in an annular shape, and a plurality of the deformable members are provided, and the plurality of deformable members are in the axial direction of the support member main body. The plurality of deformable members include a first deformable member and a second deformable member positioned closer to the base side of the support member body than the first deformable member. A space located between the first deformable member and the second deformable member and located between the inner peripheral surface of the cylindrical body and the outer peripheral surface of the support member main body. Supply means for supplying air, and air supplied to the space by the supply means, passing between the first deformable member and the inner peripheral surface of the cylindrical body, Leak into the tip side space located on the tip side The air, a discharge means for discharging to the outside of the distal end portion side space, it is possible to further comprising a. In this case, separation of the cylindrical body from the support member can be suppressed.
The deformable member may be provided in a spiral shape. In this case, the cylindrical body can be supported by the deformable member over the entire circumference of the cylindrical body and in the axial direction of the cylindrical body.
In addition, a protective member for protecting the deformable member may be provided outside the deformable member in the radial direction of the support member main body. In this case, the life of the deformable member can be extended.

Further, when the present invention is regarded as a cylindrical body supporting member, the cylindrical body supporting member to which the present invention is applied is inserted into the cylindrical body on which an image is formed, and supports the cylindrical body from the inside. It is attached to the outer peripheral surface of the member main body and the support member main body, and when the support member main body is inserted into the cylindrical body, it has a facing portion that faces the inner peripheral surface of the cylindrical body and is deformable. It is a cylindrical body support member provided with the provided deformation member, and the deformation means which deforms the deformation member so that the counter part may go to the inner peripheral surface of the cylindrical body.
From another viewpoint, the cylindrical body supporting member to which the present invention is applied is inserted into the cylindrical body on which an image is formed, and the supporting member main body that supports the cylindrical body from the inside, and the supporting member main body A deformable member that is provided so as to be wound around the support member body and is provided so as to be wound around the support member main body, and a deformable member that deforms the deformable member so that an outer diameter of the deformable member is increased. And a cylindrical body support member.

When the present invention is regarded as an image forming apparatus, the image forming apparatus to which the present invention is applied is inserted into a cylindrical body, supports the cylindrical body from the inside, and rotates the cylindrical body in the circumferential direction. A support member to be discharged, an image forming unit that discharges ink toward the outer peripheral surface from a position away from the outer peripheral surface of the cylindrical body rotated by the support member, and forms an image on the outer peripheral surface; And a pressing member pressed against the support member from the side where the forming unit is provided and through the cylindrical body.
Here, the pressing member may be supported by the image forming unit. In this case, the configuration for positioning the image forming unit with respect to the support member can be simplified.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to improve the quality of the formation image at the time of forming an image in a cylindrical body, rotating the supporting member which supports a cylindrical body from the inside.

It is the figure which showed typically an example of the printing machine which prints on a can. It is the figure which expanded and showed the can body moving mechanism. It is a figure for demonstrating an image forming unit. It is a figure for demonstrating a holding member. It is a figure for demonstrating the motion inside a holding member. It is the figure which showed the other structural example of the holding member. It is the figure which showed the other structural example of the holding member. It is the figure which showed the other structural example of the holding member. It is the figure which expanded the part in which the 1st moving member is provided among holding members. It is the figure which showed the other structural example of the holding member. It is the figure which expanded and showed a part of holding member. It is the figure which showed the other structural example of the holding member. It is a figure for demonstrating the protection member which protects a 1st elastic body. It is a figure for demonstrating the protection member which protects a 1st elastic body. It is a figure at the time of seeing a holding member main body from the side. It is a figure for demonstrating the metal plate attached to the part of the gap | interval produced between a 1st side edge and a 2nd side edge. It is sectional drawing of a holding member main body etc. after a protection member is attached with respect to the holding member main body. It is the figure which showed other structural examples, such as a holding member. It is the figure which showed the other structural example of the holding member.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
FIG. 1 is a diagram schematically illustrating an example of a printing machine 1 that performs printing on a can body.
The printing machine 1 according to the present embodiment is a printing machine that forms an image on a can body 10 as an example of a cylindrical body based on digital image information. Here, the printing machine 1 as an example of the image forming apparatus is transported by a can body transport mechanism 100 and a can body transport mechanism 100 that sequentially transport the can bodies 10 manufactured in a can body manufacturing process (not shown). The can body moving mechanism 200 that moves the can body 10 while forming an image on the outer peripheral surface of the can body 10, and the first transport device 300 that transports the can body 10 on which the image is formed by the can body moving mechanism 200. Is provided.

  Further, the printing press 1 includes a heating device 400 that heats the can body 10 that is sequentially transported by the first transport device 300, and an outer peripheral surface of the can body 10 that is heated by the heating device 400 (on the can body 10). An applicator device 500 is provided for applying a predetermined paint (on the formed image). Further, the second conveyance device 600 that further conveys the can body 10 heated by the heating device 400 and coated with the coating material by the coating device 500 to the downstream side, and the can body 10 conveyed by the second conveyance device 600 further downstream. A third transport device 700 for transporting to the side is provided.

  Further, the printing machine 1 is provided with a control unit 900 that controls each device and each mechanism unit provided in the printing machine 1. In addition, on the downstream side in the conveyance direction of the can body 10 with respect to the third conveyance device 700, an image formed on the can body 10 and a printing apparatus (not shown) for baking the paint applied to the can body 10 on the can body 10 ) Is provided.

  Here, the can body transporting mechanism 100 transports the can body 10 to the can body moving mechanism 200 located below by using the weight of the can body 10. The can body transport mechanism 100 includes guide members 110 that are provided along the vertical direction and are provided on both sides of the movement path of the can body 10. By using the guide members 110, the can body moving mechanism 200 is provided. In contrast, the can 10 is conveyed.

  The can body moving mechanism 200 is provided with a rotating member 210 that is formed in a disk shape and rotates clockwise in the drawing. Further, the can body moving mechanism 200 holds the can body 10 which is provided on the outer peripheral edge of the rotating member 210 and is sequentially transported by the can body transport mechanism 100, and moves together with the can body 10 and holds it. An image forming unit 220 that forms an image on the outer peripheral surface of the can 10 is provided.

  As described above, the image forming unit 220 is provided on the outer peripheral edge of the rotating member 210. In addition, a plurality (20 in the present embodiment) of image forming units 220 are provided and are arranged side by side along the outer peripheral edge of the rotating member 210. Further, each of the plurality of image forming units 220 is arranged at equal intervals in the circumferential direction of the rotating member 210.

FIG. 2 is an enlarged view of the can body moving mechanism 200.
As shown in the figure, and as described above, the can moving mechanism 200 of the present embodiment is provided with a rotating member 210 that is formed in a disk shape and rotates in the clockwise direction in the drawing. Yes. An image forming unit 220 that holds the can body 10 and forms an image on the outer peripheral surface of the can body 10 is provided on the outer peripheral edge of the rotating member 210.

Here, the image forming unit 220 will be described in detail.
The image forming unit 220 according to the present embodiment is provided with a turntable 221 that is formed in a disk shape and is rotatable about a center portion. In the present embodiment, a holding member (mandrel) 222 that holds the can 10 is provided at the center of the rotating table 221 so as to protrude from the rotating table 221 (provided protruding toward the front side in the figure). ing.

Here, in the present embodiment, the holding member 222 is inserted into the inside of the can body 10 through an opening formed at one end of the can body 10 formed in a cylindrical shape, and the can is formed from the inside of the can body 10 by the holding member 222. The body 10 is supported.
Further, in the image forming unit 220 of the present embodiment, the ink that is held around the holding member 222 by the holding member 222 and that discharges ink to the outer peripheral surface of the can 10 that is rotated by the holding member 222. A plurality of discharge devices 223 are provided. In addition, in the present embodiment, a plurality of ink ejection devices 223 that form an image on the can 10 by the so-called inkjet method are provided around the holding member 222.

  Here, each of the ink ejection devices 223 functioning as an image forming unit contains inks of different colors. In addition, each of the ink ejection devices 223 is disposed so as to surround the holding member 222. Further, each of the ink ejection devices 223 is formed in a long shape. Further, the ink discharge device 223 formed in such a long shape is arranged so as to go from the center of the rotary table 221 formed in a disk shape toward the outer peripheral edge. Further, each of the ink ejection devices 223 is arranged radially with the central portion of the rotary table 221 as the center. In other words, the holding members 222 are arranged radially around the center.

  In the present embodiment, as shown in FIG. 2, the ink ejection device 223 is not disposed below the holding member 222. In addition, the ink ejection device 223 is disposed above the holding member 222 or on the side of the holding member 222. As described above, when the ink discharge device 223 is provided above or to the side of the holding member 222, the ink discharge head (not shown) of the ink discharge device 223 comes to face downward or in the horizontal direction (horizontal direction). Dust is less likely to adhere to the ink discharge head.

  In the present embodiment, the rotary table 221 can rotate with respect to the rotary member 210. In this embodiment, as shown in FIG. 2, even if the image forming unit 220 moves with the rotation of the rotating member 210, the rotating table 221 rotates counterclockwise in the drawing, The posture is not changed.

  Here, in this embodiment, the posture of the image forming unit 220 is maintained by rotating the rotary table 221 counterclockwise by the motor M or the like shown in FIG. By attaching a weight (not shown) or the like, the position of the center of gravity of the rotary table 221 is decentered, and the decentering of the center of gravity keeps the posture of the image forming unit 220 constant so that the posture of the image forming unit 220 does not change. It can also be. Although only one motor M is shown in FIG. 1, a plurality of motors M are provided so as to correspond to each of the plurality of image forming units 220.

  Here, when the posture of the image forming unit 220 changes, the ink discharge head of the ink discharge device 223 comes to face upward. In this case, dust or the like easily adheres to the ink discharge head. Further, when the posture of the image forming unit 220 changes, the posture of the ink discharge device 223 also changes. In this case, the amount of ink adhering to the can body 10 may fluctuate or the ink adhering position may shift. For this reason, in this embodiment, as described above, the posture of the image forming unit 220 is maintained at a constant posture.

  The image forming unit 220 will be further described with reference to FIG. 3 (a diagram for explaining the image forming unit 220). 2A is a front view of the image forming unit 220. FIG. FIG. 5B is a view when the image forming unit 220 is viewed from the direction of arrow IIIB in FIG. 4A, and FIG. 4C is an image from the direction of arrow IIIC in FIG. FIG. 6 is a view when the forming unit 220 is viewed.

  Here, there are various types of can body 10, and the outer diameter varies depending on the type of can body 10. For this reason, in the present embodiment, the ink ejection device 223 can be moved back and forth with respect to the holding member 222. In other words, the image forming unit 220 is configured so that the ink discharge device 223 can be approached to the holding member 222 (can body 10) and the ink discharge device 223 can be separated from the holding member 222. ing. Further, in the present embodiment, as shown in FIG. 3A, an advancing / retreating mechanism 250 configured by a linear actuator or the like and moving the ink ejection device 223 relative to the holding member 222 is provided.

  In the present embodiment, as shown in FIG. 3B, a servo motor M1 that is attached to the back side of the rotary table 221 and rotates the holding member 222 in the circumferential direction is provided. In the present embodiment, the holding member 222 holding the can 10 is rotated by the servo motor M1. Thereby, the can 10 rotates in the circumferential direction. On the other hand, ink is ejected from each of the ink ejection devices 223 to the outer peripheral surface of the can 10. As a result, an image is formed on the outer peripheral surface of the can 10.

  In addition, although description was abbreviate | omitted above, in this embodiment, in the depth direction of the printing press 1 (refer FIG. 1), the can body 10 called a "pocket" is located in the front side rather than the can body moving mechanism 200. A holder H for temporary reception is provided (not shown in FIG. 1, see FIG. 3C). The pocket (holder H) moves together with the image forming unit 220 on the front side of the can moving mechanism 200.

  Here, in the present embodiment, the can body 10 is unloaded from the can body transport mechanism 100 and once placed in the pocket. At the back of the pocket is a holding member 222 installed in the image forming unit 220. In the present embodiment, the center of the can 10 placed in the pocket and the center of the holding member 222 are configured to coincide with each other. Here, in the present embodiment, the can body 10 is pushed out toward the holding member 222 by a pushing member (not shown). Accordingly, the can body 10 moves to the holding member 222 side so as to slide on the pocket, the holding member 222 is inserted into the can body 10, and the can body 10 is held by the holding member 222.

  Here, when the can body moving mechanism 200 forms an image on the can body 10, first, the can body 10 is sequentially supplied from the can body transport mechanism 100 to the can body moving mechanism 200. It is held by the holding member 222. Ink is ejected from each of the ink ejection devices 223. In addition, in the present embodiment, ink is simultaneously ejected from the plurality of ink ejection devices 223.

  Then, when the can body 10 is rotated about 360 ° after the rotation of the can body 10 is started (when the can body 10 makes about one turn), the rotation of the servo motor M1 is stopped. Further, the ink ejection by the ink ejection device 223 is also stopped. Thereby, it will be in the state by which the image was formed in the outer peripheral surface of the can 10 over the perimeter. Thereafter, the can body 10 is delivered to the first transport device 300 disposed on the downstream side of the can body moving mechanism 200. Thereafter, the can 10 is further transported through the heating device 400, the coating device 500, the second transport device 600, and the third transport device 700, and then discharged out of the printing press 1.

  In the embodiment, the can body 10 is inserted into the can body moving mechanism 200 and discharged from the can body moving mechanism 200 (until the can body 10 is delivered to the first transport device 300). The can 10 rotates about 360 °. In this embodiment, the cans 10 are sequentially inserted into a plurality of image forming units 220, and image formation on the cans 10 is performed by a plurality of image forming units 220 instead of a single image forming unit 220. Is done.

Here, the holding member 222 will be further described.
FIG. 4 is a view for explaining the holding member 222. FIG. 2B is a cross-sectional view of the holding member 222 on a surface along the axial direction of the holding member 222 and passing through the axis of the holding member 222, and FIG. It is sectional drawing in the IVA-IVA line.

  The holding member 222 of this embodiment that functions as a support member and a cylindrical body support member is provided with a holding member main body 410 formed in a cylindrical shape, as shown in FIGS. . Here, the holding member main body 410 as an example of the support member main body is formed so that the cross-sectional shape of the outer peripheral surface is circular. Further, as shown in FIG. 5B, the holding member main body 410 has a cylindrical portion 411 formed in a cylindrical shape, and is positioned at the tip of the holding member main body 410 and formed in an annular shape, and the cylindrical portion 411. A protruding portion 412 is provided so as to protrude in the radial direction from the outer peripheral surface of the.

  Further, in the holding member 222 of the present embodiment, as shown in FIG. 5B, a first tubular member 420 is provided outside the holding member main body 410. Here, the first cylindrical member 420 is formed in a cylindrical shape. The first tubular member 420 has a through-hole 421 formed along the axial direction and formed so as to pass through the axial center. Here, in the present embodiment, the first tubular member 420 is attached to the holding member main body 410 by passing the holding member main body 410 through the through hole 421.

  Furthermore, in this embodiment, the 2nd cylindrical member 430 is provided in the opposite side to the side in which the 1st cylindrical member 420 is pinched | interposed and the protrusion part 412 is provided. In other words, the second cylindrical member 430 is provided on the base side of the holding member main body 410. Similar to the first cylindrical member 420, the second cylindrical member 430 is formed in a cylindrical shape. Moreover, the 2nd cylindrical member 430 has the through-hole 431 formed along the axial direction and formed so that it might pass along an axial center. Here, in the present embodiment, similarly to the first cylindrical member 420, the second cylindrical member 430 is attached to the holding member main body 410 by passing the holding member main body 410 through the through hole 431. It is in the state.

  In the present embodiment, the first moving member 440 that is formed in an annular shape and disposed between the protruding portion 412 and the first cylindrical member 420 and movable along the axial direction of the holding member main body 410 is provided. Is provided. Further, a second moving member 450 that is also formed in an annular shape and is disposed between the first cylindrical member 420 and the second cylindrical member 430 and is movable along the axial direction of the holding member main body 410 is provided. Is provided.

  In the present embodiment, the first ring-shaped member is disposed between the protruding portion 412 and the first moving member 440 so as to surround the outer peripheral surface of the holding member main body 410 and is formed of an elastic body such as rubber. 460 is provided. In addition, in the present embodiment, a first ring-shaped member 460 is provided between the protruding portion 412 and the first moving member 440 so as to be wound around the outer peripheral surface of the holding member main body 410. Here, the first ring-shaped member 460 of the present embodiment is in a state of being wound around the holding member main body 410 once. More specifically, in the present embodiment, an annular first ring-shaped member 460 is provided on the distal end side of the holding member main body 410.

  In the present embodiment, the second moving member 450 and the second cylindrical member 430 are also disposed between the second moving member 450 and the second cylindrical member 430 so as to surround the outer peripheral surface of the holding member main body 410 and are formed of an elastic body such as rubber. A two-ring member 470 is provided. In addition, in the present embodiment, the second ring-shaped member 470 is provided on the base side of the holding member main body 410 with respect to the first ring-shaped member 460. More specifically, in the present embodiment, the first ring-shaped member 460 and the second ring-shaped member 470 are provided so that the positions of the holding member main body 410 in the axial direction are different from each other. Note that the first ring-shaped member 460 and the second ring-shaped member 470 are both formed in an annular shape and without a seam.

  A concave portion 412A formed along the circumferential direction of the holding member main body 410 is formed at the outer peripheral edge of the projecting portion 412 and facing the first moving member 440, and the first deforming member is formed. As an example, the first ring-shaped member 460 is disposed in the recess 412A. In addition, a recess 430A along the circumferential direction of the second cylindrical member 430 is also formed at the outer peripheral edge of the second cylindrical member 430 and facing the second moving member 450, and the second deformable member A second ring-shaped member 470 as an example is disposed in the recess 430A.

  Further, in the present embodiment, the first concave portion is provided on the end portion of the first cylindrical member 420 on the side where the first moving member 440 is provided and on the inner peripheral surface side of the first cylindrical member 420. 426 is formed, and the first moving member 440 is provided so that a part thereof is accommodated in the first recess 426. In addition, a second recess 427 is formed on an end portion of the first cylindrical member 420 on the side where the second moving member 450 is provided and on the inner peripheral surface side of the first cylindrical member 420, The second moving member 450 is provided so that a part thereof is accommodated in the second recess 427.

  Further, in the present embodiment, the outer peripheral surface of the first moving member 440 (location facing the inner peripheral surface of the first tubular member 420) and the inner peripheral surface of the first moving member 440 (the outer periphery of the holding member main body 410). A rubber O-ring 480 (481, 482) is provided at a location facing the surface. Further, the outer peripheral surface of the second moving member 450 (location facing the inner peripheral surface of the first cylindrical member 420) and the inner peripheral surface of the second moving member 450 (location facing the outer peripheral surface of the holding member main body 410). ) Are also provided with rubber O-rings 480 (481, 482).

  In the present embodiment, a hole 413 to which compressed air sent from a compressor (not shown) or the like is supplied is provided inside a cylindrical portion 411 provided in the holding member main body 410. Here, the hole portion 413 is disposed along the axial direction of the tubular portion 411 and is provided so as to pass through the central portion of the tubular portion 411. The hole 413 is formed so that the cross section is circular. Furthermore, in the present embodiment, a through hole 414 formed so as to go from the hole 413 toward the outer peripheral surface of the holding member main body 410 is provided. In FIG. 4B, two through holes 414 are shown, but the through holes 414 are arranged every 90 ° in the circumferential direction of the holding member main body 410, and a total of four through holes are provided.

  In the present embodiment, the first cylindrical member 420 is provided so as to be connected to the through hole 414 and is arranged along the radial direction of the first cylindrical member 420, and is sent from the through hole 414. A first ventilation hole 422A through which the compressed air passes is provided. Further, the first tubular member 420 has a second ventilation hole 422B and a first movement hole 422A, which are formed to start from the first ventilation hole 422A toward the first movement member 440. The second movement member 450 starts from the first ventilation hole 422A. A third ventilation hole 422C is formed so as to be directed toward the front. Each of the first vent holes 422A to 422C is also arranged every 90 ° in the circumferential direction of the holding member main body 410, and a total of four are provided.

FIG. 5 is a view for explaining the internal movement of the holding member 222.
Here, in the present embodiment, when the holding member 222 is inserted into the can 10, the compressed air is supplied to the hole 413 formed in the holding member main body 410. Accordingly, the compressed air is also supplied to the through hole 414 and the first vent hole 422A to the third vent hole 422C. In this case, in this embodiment, the first moving member 440 moves toward the direction indicated by the arrow 5A in FIG.

  As a result, the first ring-shaped member 460 is pressed by the protruding portion 412 and the first moving member 440 functioning as a part of the deformation means, and as shown in FIG. The shaped member 460 undergoes elastic deformation. In other words, the first ring-shaped member 460 undergoes elastic deformation so that the outer peripheral diameter (outer diameter) of the first ring-shaped member 460 is increased.

  In this case, the outer peripheral surface of the first ring-shaped member 460 comes into contact with the inner peripheral surface of the can body 10, and the inner peripheral surface is pressed by the first ring-shaped member 460. In addition, in the present embodiment, the first ring-shaped member 460 is elastically deformed so that the cross-sectional shape thereof is an ellipse, and a part of the long side of the ellipse is in contact with the inner peripheral surface of the can body 10. In addition, the first ring-shaped member 460 undergoes elastic deformation. More specifically, the first ring-shaped member 460 elastically deforms so that the confronting part of the first ring-shaped member 460 facing the inner peripheral surface of the can 10 faces the inner peripheral surface.

  Although not shown, the same applies to the second ring-shaped member 470 (see FIG. 4), and when compressed air is supplied, the second moving member 450 and the second cylindrical member 430 cause the second ring-shaped member. The second ring-shaped member 470 is elastically deformed so that the member 470 is pressed and the outer diameter is increased. In this case, the outer peripheral surface of the second ring-shaped member 470 is in contact with the inner peripheral surface of the can body 10, and the inner peripheral surface is pressed by the second ring-shaped member 470.

  Here, in the configuration of the present embodiment, the holding member 222 enters the inside of the can body 10 and the can body 10 is held. However, in order to enable the can body 10 to be inserted into the holding member 222, the can body The can body 10 and the holding member 222 are formed so that the outer diameter of the holding member 222 is smaller than the inner diameter of the tenth member. In this case, the distance between the outer peripheral surface of the can body 10 and the ink ejection device 223 (see FIG. 3) due to a gap generated between the outer peripheral surface of the holding member 222 and the inner peripheral surface of the can body 10. May fluctuate.

  In other words, if there is a gap between the outer peripheral surface of the holding member 222 and the inner peripheral surface of the can body 10, the size of the gap is not constant and tends to vary in the circumferential direction of the can body 10. In such a case, the separation distance between the can body 10 and the ink ejection device 223 varies according to the rotation of the can body 10. In this case, the quality of the formed image may be degraded, for example, distortion may occur in the image formed on the can 10.

  For this reason, in this embodiment, it is set as the structure which supports the can 10 with the 1st ring-shaped member 460 and the 2nd ring-shaped member 470 as mentioned above. In this case, the possibility that the outer peripheral surface of the can body 10 is located at a position equidistant from the axial center of the holding member 222 (holding member main body 410) is increased, resulting in a variation in the separation distance between the can body 10 and the ink ejection device 223. The accompanying deterioration in image quality is less likely to occur.

  Even when a gap is formed between the can body 10 and the holding member 222, an image is formed on the can body 10 by pressing the printing plate against the holding member 222 via the can body 10 such as offset printing. In this case, the can body 10 comes into close contact with the surface of the holding member 222, and image quality deterioration due to the change in the separation distance is less likely to occur. On the other hand, when an image is formed on the can body 10 in a non-contact manner such as an inkjet method, a gap is generated between the can body 10 and the holding member 222. In this case, the gap is not the same throughout the circumferential direction of the can body 10, the gap is small in some places, and the gap is large in other places. For example, when the gap between the holding member 222 and the can body 10 is small, the distance between the outer peripheral surface of the can body 10 and the ink ejection device 223 is large, and when the gap between the holding member 222 and the can body 10 is large, the outer circumference of the can body 10 is increased. The distance between the surface and the ink ejection device 223 is reduced. As a result, the time for the ink droplets ejected from the ink ejection device 223 to reach the outer peripheral surface of the can body 10 varies depending on the portion of the can body 10, and as a result, the ink droplets reach the top surface of the can body 10. Variations will occur. For this reason, the image quality is likely to deteriorate due to the variation in the separation distance.

  In the above description, the case where the elastic body such as the first ring-shaped member 460 is deformed by supplying the compressed air has been described (the first moving member 440 and the second moving member 450 are supplied by supplying the compressed air). Although the case of the movement has been described), by changing the arrangement of the ventilation holes such as the first ventilation hole 422A to the third ventilation hole 422C and the arrangement of the first movement member 440 and the like, by suction of air (by negative pressure) ), The first ring-shaped member 460 and the like can be elastically deformed. In each configuration described below, the elastic body is deformed using compressed air. However, in each configuration described below, the elastic body can be deformed by suction of air (by negative pressure). .

  Although not described above, in the present embodiment, the amount of movement of the first moving member 440 is determined by the gap formed between the first moving member 440 and the protruding portion 412. At this time, if components such as the first moving member 440 and the protruding portion 412 are accurately manufactured by machining or the like, the moving amount of the first moving member 440 becomes constant. For this reason, if the cross-sectional shape of the 1st ring-shaped member 460 is the same over the perimeter of the 1st ring-shaped member 460, the deformation amount of the 1st ring-shaped member 460 will also be the same. In this case, the protrusion amount of the outer peripheral portion of the first ring-shaped member 460 protruding from the outer peripheral surface of the holding member main body 410 is the same on the entire periphery of the first ring-shaped member 460.

  In this case, the first ring-shaped member 460 uniformly presses the inner peripheral surface of the can body 10. At this time, the circle formed by the outer peripheral portion of the first ring-shaped member 460 is in a state close to a perfect circle. The same applies to the second ring-shaped member 470 side. In the present embodiment, the second ring-shaped member 470 uniformly presses the inner peripheral surface of the can body 10. At this time, the circle formed by the outer peripheral portion of the second ring-shaped member 470 is in a state close to a perfect circle.

  6 and 7 are diagrams showing another configuration example of the holding member 222. FIG. FIG. 6 is a cross-sectional view of the holding member 222 on the surface along the axial direction of the holding member 222 and passing through the axis of the holding member 222. 7 is a cross-sectional view of the holding member 222 rotated by 45 ° in the circumferential direction from the state shown in FIG.

  In this configuration example, as shown in FIG. 6, in addition to the first vent hole 422A to the third vent hole 422C, a fourth vent hole 422D is provided. Here, the fourth ventilation hole 422D functioning as a part of the supply means is connected to the first ventilation hole 422A at a branch portion where the second ventilation hole 422B and the third ventilation hole 422C branch from the first ventilation hole 422A. In addition to being connected, the connecting portion connected to the first ventilation hole 422A is formed as a starting point toward the outer peripheral surface of the first tubular member 420.

  In addition, the fourth ventilation hole 422D is provided so as to connect the opening 425 formed on the outer peripheral surface of the first tubular member 420 and the first ventilation hole 422A. The opening 425 is disposed between the first ring-shaped member 460 and the second ring-shaped member 470 in the axial direction of the holding member 222.

  Here, in this configuration example, the supplied compressed air is supplied to the gap between the outer peripheral surface of the holding member 222 and the inner peripheral surface of the can body 10 through the fourth vent hole 422D and the opening 425. . In addition, it is a space located between the outer peripheral surface of the holding member 222 and the inner peripheral surface of the can body 10 via the fourth vent hole 422D and the opening 425, and includes the first ring-shaped member 460 and the second ring-shaped member. Compressed air is supplied to a space located between the member 470.

  Thereby, in this embodiment, the side part (outer peripheral surface) of the can body 10 is pressed toward the radial direction of the can body 10 by this compressed air, and the outer peripheral surface of the can body 10 is supported by the compressed air. become. In this case, since the portion other than the portions supported by the first ring-shaped member 460 and the second ring-shaped member 470 in the can body 10 is also pressed with equal pressure by the Pascal principle, the holding member 222 It becomes easy to arrange | position in the position of equidistant from the axial center. In FIG. 6, one fourth vent hole 422 </ b> D is illustrated, but the fourth vent holes 422 </ b> D are also arranged every 90 ° in the circumferential direction of the holding member 222, and a total of four are provided.

  Further, in this configuration, as shown in FIG. 7, an exhaust hole 415 used for discharging the supplied compressed air is formed in the holding member main body 410. The exhaust holes 415 are also arranged every 90 ° in the circumferential direction of the holding member 222, and a total of four exhaust holes are provided. Here, the exhaust hole 415 is provided along the axial direction of the holding member main body 410 and is provided so as to penetrate the cylindrical portion 411 of the holding member main body 410.

  Further, the exhaust hole 415 is an opening 417 formed on the projecting portion 412 side of the first ring-shaped member 460 and formed at the distal end portion of the holding member main body 410, and the exhaust hole 415 is positioned outside the holding member 222. It is provided so as to connect to a space (a space that is atmospheric pressure). More specifically, the exhaust hole 415 is arranged in a relationship of a first part 415A extending linearly along the axial direction of the tubular part 411, and a connection with the first part 415A and intersecting the first part 415A. The second portion 415B extends toward the opening 417.

  Here, in the present configuration example, as described above, the space is located between the outer peripheral surface of the holding member 222 and the inner peripheral surface of the can body 10, and includes the first ring-shaped member 460 and the second ring. Compressed air is supplied to the space located between the cylindrical members 470. By the way, in such a configuration, the first ring-shaped member 460 is not in close contact with the inner peripheral surface of the can body 10, and a gap is formed between the first ring-shaped member 460 and the inner peripheral surface of the can body 10. Then, the supplied compressed air is supplied to a space (a tip end side space (a space indicated by reference numeral 7A in FIG. 7)) located on the bottom surface side of the can body 10 with respect to the first ring-shaped member 460. It becomes like this.

  In this case, the bottom surface of the can body 10 is pushed in a direction away from the holding member 222, and the can body 10 may be detached from the holding member 222. For this reason, in this embodiment, it is set as the structure which provides the exhaust hole 415 which functions as a discharge means. In this case, the compressed air leaking to the bottom surface side of the can body 10 is discharged through the exhaust hole 415, and the force that pushes the can body 10 in the direction away from the holding member 222 is prevented from acting on the can body 10. Is done.

  In the above description, the case where the two ring-shaped members of the first ring-shaped member 460 and the second ring-shaped member 470 are provided has been described as an example, but FIG. 8 (a diagram illustrating another configuration example of the holding member 222). ), Three or more ring-shaped members may be provided.

  8, in addition to the first ring-shaped member 460 and the second ring-shaped member 470, the third ring-shaped member 473 is interposed between the first ring-shaped member 460 and the second ring-shaped member 470. The fourth ring-shaped member 474 is provided. In this configuration example, similarly to the above, between the first ring-shaped member 460 and the third ring-shaped member 473, between the third ring-shaped member 473 and the fourth ring-shaped member 474, the fourth ring-shaped Compressed air may be supplied between the member 474 and the second ring-shaped member 470.

Another configuration example of the holding member 222 will be further described.
FIG. 9 is an enlarged view of a portion of the holding member 222 where the first moving member 440 is provided.
In this configuration example, as illustrated in FIG. 9A, an inclined surface (tapered surface) 442 is formed at a location in the first moving member 440 that contacts the first ring-shaped member 460. Here, the inclined surface 442 is formed so as to gradually move away from the outer peripheral surface of the holding member main body 410 as it goes from the side where the protruding portion 412 is located toward the side where the first tubular member 420 is located. Yes. More specifically, in the present embodiment, the first cylindrical member 420 is positioned from the side where the protruding portion 412 is located on the outer peripheral surface of the first moving member 440 in contact with the first ring-shaped member 460. The diameter gradually increases as it goes to the side where it is running.

  Here, when the compressed air is supplied to the second ventilation hole 422B, the first moving member 440 moves to the left in the drawing as shown in FIG. 9B. Here, in this configuration example, the first ring-shaped member 460 is pushed upward in the drawing by the inclined surface 442, and by this pushing up, as shown in FIG. The first ring-shaped member 460 comes into contact.

  In other words, in the present embodiment, the inclined surface 442 causes the first ring-shaped member 460 to extend in the circumferential direction and increases the diameter of the first ring-shaped member 460. Thereby, the 1st ring-shaped member 460 contacts the inner peripheral surface of the can 10. In this case, similarly to the above, the outer peripheral surface of the can 10 is easily located at a position equidistant from the axis of the holding member 222. In this configuration example, the first ring-shaped member 460 having a circular cross-sectional shape has been described as an example. However, the configuration is not limited to a circle, and may be, for example, an ellipse, a trapezoid, a triangle, or a polygon.

  FIG. 10 is a view showing another configuration example of the holding member 222. FIG. 2B is a cross-sectional view of the holding member 222 on a surface along the axial direction of the holding member 222 and passing through the axis of the holding member 222, and FIG. It is sectional drawing in the XA-XA line | wire.

  In the configuration example described above, the holding member 222 is configured by members such as the holding member main body 410, the first cylindrical member 420, and the second cylindrical member 430. However, in this configuration example, the holding member 222 is cylindrical. The holding member main body 410 is formed, a first elastic body 710 formed in an annular shape (ring shape), and a second elastic body 720 also formed in an annular shape.

  Here, similarly to the above, the holding member main body 410 is arranged along the axial direction of the holding member main body 410 so as to pass through the central portion of the holding member main body 410 and has a circular cross section. 413 is provided. Further, in this configuration example, a first ventilation hole 481 is provided that is arranged along the radial direction of the holding member main body 410 and through which the compressed air sent from the hole 413 passes.

  Further, in the present configuration example, the second ventilation hole 482 and the first ventilation hole 481 formed so as to be connected to the first ventilation hole 481 and toward one end portion in the axial direction of the holding member main body 410 are connected. In addition, a third vent hole 483 is provided so as to be directed toward the other end portion in the axial direction of the holding member main body 410. Each of the first vent holes 481 to the third vent holes 483 is arranged every 90 ° in the circumferential direction of the holding member main body 410, and a total of four are provided.

  In the present embodiment, a first groove 491 is formed along the circumferential direction of the holding member main body 410 on the outer peripheral surface of the holding member main body 410 at one end in the axial direction of the holding member main body 410. Further, a second groove 492 along the circumferential direction of the holding member main body 410 is formed on the outer peripheral surface of the holding member main body 410 at the other end in the axial direction of the holding member main body 410. In the present embodiment, the first elastic body 710 is accommodated in the first groove 491, and the second elastic body 720 is accommodated in the second groove 492.

Further, in this configuration example, the second ventilation hole 482 is connected to the first groove 491, and compressed air is supplied into the first groove 491. Further, the compressed air is supplied between the first elastic body 710 and the outer peripheral surface of the holding member main body 410.
The same applies to the second groove 492 side, and a third ventilation hole 483 is connected to the second groove 492 so that compressed air is supplied into the second groove 492. Further, the compressed air is supplied between the second elastic body 720 and the outer peripheral surface of the holding member main body 410. At this time, since the first groove 491 and the first elastic body 710 and the second groove 492 and the second elastic body 720 are respectively fitted and stored, the compressed air is supplied from the second air hole 482 and the third air hole 483. Even if is supplied, compressed air does not leak out of the first elastic body 710 and the second elastic body 720 from the fitting portion.

  Further description will be made with reference to FIG. 11 (a diagram showing a part of the holding member 222 in an enlarged manner). As shown in FIG. 11A, the first elastic body 710 is arranged in the axial direction of the holding member main body 410. It is arranged along. The first elastic body 710 has one end 711 on the distal end side of the holding member main body 410 and the other end 712 on the side opposite to the one end 711. The first elastic body 710 is formed in a curved state so that a portion located between the one end 711 and the other end 712 protrudes in a direction away from the outer peripheral surface of the holding member main body 410.

Further, in this configuration example, the one end 711 and the other end 712 are disposed so as to be in close contact with the outer peripheral surface of the holding member main body 410, and the portion located between the one end 711 and the other end 712 and the holding member main body 410 are arranged. A gap is formed between the outer peripheral surface and the outer peripheral surface.
Further, in this configuration example, one end 711 of the first elastic body 710 is inserted into the recess 491A formed in the first side wall 491C of the first groove 491, and the other end 712 of the first elastic body 710 is inserted into the first groove 491A. It is inserted into a recess 491B formed in the second side wall 491D of 491. In addition, the portion of the first elastic body 710 where the one end 711 and the other end 712 are located is thicker than the other portions. Thereby, in this structural example, the 1st elastic body 710 is hard to come off from the holding member main body 410, and it is hard to leak air.

  More specifically, as shown in FIG. 11A, the first groove 491 has a bottom surface 491E, a first side wall 491C extending from the bottom surface 491E toward the outer peripheral surface of the holding member main body 410, and a first side wall 491C facing each other. A second side wall 491D that is disposed at a position and extends from the bottom surface 491E toward the outer peripheral surface of the holding member main body 410 is provided. In addition, recesses 491A and 491B extending along the circumferential direction of the holding member main body 410 are formed in each of the first side wall 491C and the second side wall 491D. In the present configuration example, as described above, one end 711 of the first elastic body 710 is inserted into one recess 491A, and the other end 712 of the first elastic body 710 is inserted into the other recess 491B.

  Here, when compressed air is supplied in this configuration example, this compressed air is supplied to the second ventilation hole 482 shown in FIG. The compressed air is supplied to a gap formed between the first elastic body 710 and the outer peripheral surface of the holding member main body 410. If it adds, it will supply to the clearance gap formed between the bottom face 491E formed in the 1st groove | channel 491, and the 1st elastic body 710. FIG.

  As a result, the first elastic body 710 is deformed so as to swell toward the inner peripheral surface of the can body 10 as shown in FIG. 11B, and the top thereof contacts the inner peripheral surface of the can body 10. . The same applies to the second elastic body 720 (see FIG. 10), and the second elastic body 720 is also deformed so as to swell toward the inner peripheral surface of the can body 10, and the top portion of the inside of the can body 10 is Contact the peripheral surface. As a result, the outer peripheral surface of the can 10 is easily located at a position equidistant from the axis of the holding member 222 as in the configuration shown in FIG.

FIG. 12 is a view showing another configuration example of the holding member 222. In FIG. 12, the first elastic body 710 is illustrated, but the second elastic body 720 side is configured in the same manner as the first elastic body 710.
In this configuration example, a third elastic body 730 is provided in addition to the configuration described in FIG. Here, the third elastic body 730 is disposed outside the first elastic body 710 and is provided so as to contact the outer peripheral surface of the first elastic body 710. Further, the third elastic body 730 has a flat cross-sectional shape. Further, the third elastic body 730 is formed in an annular shape and arranged along the circumferential direction of the holding member main body 410.

  Here, in this configuration example, when the first elastic body 710 located inside the third elastic body 730 swells in the radial direction, the first elastic body 710 presses the third elastic body 730 from the inside, The third elastic body 730 swells in the radial direction in the same manner as the first elastic body 710. In this configuration example, when the supply of compressed air is finished, the first elastic body 710 is deformed so that the top (the top of the first elastic body 710) moves inward in the radial direction. At this time, the third elastic body 730 presses the top to assist the deformation of the first elastic body 710. Thereby, in this embodiment, it becomes easy to return the 1st elastic body 710 to the original state (state before supplying compressed air).

  In the present embodiment, the third elastic body 730 is more easily restored than the first elastic body 710 (when the supply of compressed air is stopped, the third elastic body 730 is in its original state). It ’s easier to go back to In the present embodiment, the third elastic body 730 that is in direct contact with the can body 10 has more wear resistance than the first elastic body 710.

  Further, in this configuration example, the elastic body is not composed of one part, and the elastic body is composed of two different materials by dividing the elastic body into two parts, a first elastic body 710 and a third elastic body 730. It is possible to do. In this case, various requirements can be satisfied as compared with the case of a single component. In this configuration example, the elastic body gradually wears out. In this case, if only the third elastic body 730 is replaced, the elastic body can be used again. In this configuration example, the cross-sectional shape of the third elastic body 730 is a flat plate shape, but may be a circular shape, an elliptical shape, a triangular shape, a trapezoidal shape, or a polygonal shape.

  In the above description, the configuration in which the elastic body such as the first elastic body 710 and the third elastic body 730 is in direct contact with the can body 10 has been described, but in such a configuration, the holding member 222 is used as the holding member 222 is used. 1 The elastic body 710 and the like are worn. Therefore, in order to prevent such wear, it is preferable to provide a protective member for protecting the first elastic body 710 and the like between the can body 10 and the first elastic body 710 and the like. Hereinafter, this protective member will be described.

13 and 14 are diagrams for explaining a protective member that protects the first elastic body 710 and the like.
The protection member 905 in the present embodiment is formed in a cylindrical shape as shown in FIG. Further, as shown in FIG. 14, the protective member 905 is formed by rounding a single plate material having a first side 901 and a second side 902 located on the opposite side of the first side 901. It is formed by that. Further, in the protection member 905, the plate material is rounded so that the first side 901 and the second side 902 face each other. More specifically, the protection member 905 is formed by rolling a metal plate such as stainless steel.

  Further, as shown in FIG. 14A, the plate material before the protective member 905 is formed has a first substrate 910 having a first side 901 and a second side 902, and a first substrate 910 formed in a rectangular shape. There are three protruding pieces 920 that protrude from the side 901 and are arranged in a relationship orthogonal to the substrate 910, and three protruding pieces 930 that protrude from the second side 902 and are arranged in a relationship orthogonal to the substrate 910. Is provided. Note that the three protruding pieces 920 and the three protruding pieces 930 face each other when the substrate 910 is rolled, as shown in FIG. 14B.

  In addition, although the case where the two elastic bodies of the 1st elastic body 710 and the 2nd elastic body 720 were provided was demonstrated above, this elastic body can be provided three or more. Here, in the configuration example shown in FIG. 13, in addition to the first groove 491 and the second groove 492, a third groove 493 and a fourth groove 494 are formed in the holding member main body 410, and a total of four elastic bodies are formed. It has a configuration to be provided.

  Further, as shown in FIG. 13, the holding member body 410 in this configuration example includes a first axial groove 416 </ b> A, a second axial groove 416 </ b> B, and a third axis that are arranged along the axial direction of the holding member body 410. Directional grooves 416C are formed. The first axial groove 416A is disposed between the first groove 491 and the third groove 493, and the second axial groove 416B is disposed between the third groove 493 and the fourth groove 494. The third axial groove 416C is disposed between the fourth groove 494 and the second groove 492.

  The protection member 905 is attached to the holding member main body 410 after the elastic body is attached to each of the first groove 491 to the fourth groove 494. Further, the protection member 905 is attached to the holding member main body 410 by winding the curled protection member 905 once and then winding it around the holding member main body 410. Further, when the protection member 905 is attached to the holding member main body 410, the three protruding pieces 920 are inserted into the first axial groove 416A, the second axial groove 416B, and the third axial groove 416C, respectively. In addition, each of the three protruding pieces 930 is inserted into the first axial groove 416A, the second axial groove 416B, and the third axial groove 416C, respectively.

  Although not shown in FIGS. 13 and 14, FIG. 15 (a view when the holding member body 410 is viewed from the side) is provided on the outer peripheral surface of the holding member body 410 at the base of the holding member body 410. As shown, an annular groove 418 formed along the circumferential direction of the holding member main body 410 is provided.

  Although not shown in FIGS. 13 and 14, a portion of the protective member 905 that faces the groove 418 (the edge of the protective member 905) is formed in a curved state toward the inward side. (See FIG. 16). In other words, both ends of the protection member 905 are drawn, and the diameter of the protection member 905 decreases toward the edge of the protection member 905. In this configuration example, the protection member 905 is attached to the holding member main body 410 so that the edge enters the groove 418. Accordingly, in this configuration example, the protection member 905 is not easily detached from the holding member main body 410.

  Here, when the protective member 905 as in this configuration example is provided, wear of the first elastic body 710 and the like can be suppressed as described above. Further, the holding member 222 may need to be replaced due to dirt, deformation, wear, etc. due to long-term use, but when the protective member 905 is provided, the protective member 905 may be replaced, There is no need to replace the entire holding member 222.

  Note that after the protection member 905 is attached to the holding member main body 410, a gap is generated between the first side 901 (see FIG. 13) and the second side 902 of the protection member 905. In this case, the first elastic body to the fourth elastic body (not shown in FIGS. 13 to 15) cannot be covered with the protective member 905 in the portion where the gap is generated. In other words, the first elastic body to the fourth elastic body are exposed at the portion where the gap is generated. For this reason, in this configuration example, a metal plate is separately attached to the gap formed between the first side 901 and the second side 902 so that the first to fourth elastic bodies are not exposed. ing.

FIG. 16 is a view for explaining a metal plate attached to a gap portion formed between the first side 901 and the second side 902.
The metal plate 907 is formed in a rectangular shape as shown in FIG. Four metal plates 907 are provided so as to correspond to the four elastic bodies. Further, the metal plate 907 is disposed on the inner peripheral surface side of the protection member 905. In addition, the metal plate 907 is provided so as to straddle a gap generated between the first side 901 and the second side 902.
When the substrate 910 is rounded into a cylindrical shape by providing extensions that extend the first side 901 on both sides of the protruding piece 920 along the substrate 910, the extension of the first side 901 is provided. Can be replaced with the metal plate 907 so as to overlap the second side 902.

  Furthermore, in this configuration example, the end portion located on the first side 901 side of the metal plate 907 is fixed to the inner peripheral surface of the protection member 905 by welding. On the other hand, the end located on the second side 902 side of the metal plate 907 is not fixed to the protection member 905. Here, if the both ends of the metal plate 907 are fixed, the protective member 905 cannot be deformed so as to expand in the radial direction, thereby inhibiting the swelling of the elastic body.

  FIG. 17 is a cross-sectional view of the holding member body 410 and the like after the protection member 905 is attached to the holding member body 410. In addition, FIG. 17 is a cross-sectional view taken along line XVII-XVII in FIG. 14B, and is a cross-sectional view showing not only the protective member 905 but also the holding member main body 410.

  In this configuration example, in addition to the configurations described in FIGS. 13 to 16, an elastic member 980 for bringing the protective member 905 to the outer peripheral surface of the holding member main body 410 is provided. Here, the elastic member 980 is made of a metal such as stainless steel and has elasticity (spring property). Further, the elastic member 980 is formed so that the cross-sectional shape is C-shaped. Further, as shown in FIG. 17A, the elastic member 980 having a C-shaped cross section includes a first side 982 and a second side 982 arranged at a position opposite to the first side 981. Have. Further, the elastic member 980 has a gap 983 between the first side edge 981 and the second side edge 982.

  Here, as shown in FIG. 17A, the elastic member 980 has a first side 982 facing a protruding piece 920 provided on the protective member 905, and a second side 982 has a protective member. It is attached to the protection member 905 so as to oppose the protruding piece 930 provided on 905. In other words, the elastic member 980 is attached to the protection member 905 so that the two protruding pieces 920 and 930 enter the gap 983. FIG. 17A shows a state in which an elastic body (not shown) is inflated. In this state, as the two protruding pieces 920 and 930 move away from each other, the elastic body (not shown) is elastic. The elastic member 980 is deformed so that the diameter of the member 980 is expanded.

  On the other hand, when the supply of compressed air is stopped, the elastic body contracts. At this time, the two protruding pieces 920 and 930 come closer to each other by the elastic member 980. As a result, the diameter of the protective member 905 is reduced, and the protective member 905 approaches the outer peripheral surface of the holding member main body 410. In this case, the protective member 905 is separated from the inner peripheral surface of the can body 10, and the can body 10 is smoothly removed from the holding member main body 410. Here, although the elastic member 980 having a C-shaped cross section has been described as an example, the cross-sectional shape may be a triangle, a heart shape, or a polygon. Further, the diameter of the protective member 905 may be reduced by using coil springs or air cylinders opposed to each other.

  Three elastic members 980 may be provided so as to correspond to each of the three protruding pieces 920 (three protruding pieces 930). For example, of the three protruding pieces 920 (three protruding pieces 930), It can also be provided so as to correspond to one or two protruding pieces. Although not described above, the elastic member 980 is not attached to the protection member 905 in a state where the elastic bodies such as the first elastic body 710 and the second elastic body 720 of the holding member main body 410 are inflated. In this state, the elastic member 980 is placed in advance in the first axial groove 416A (see FIG. 13). Then, when the protection member 905 is attached to the holding member main body 410, the protruding piece 920 (the protruding piece 930) is inserted into the gap 983 (see FIG. 17A).

  In the above, the outer periphery of the can body 10 is placed at a location where the distance from the axial center of the holding member 222 is equal by pressing the first ring-shaped member 460, the first elastic body 710, and the like against the inner peripheral surface of the can body 10. The surface is positioned so as to suppress deterioration of the quality of the formed image. Incidentally, it is possible to suppress the deterioration of the quality of the formed image even with the configuration shown in FIGS.

  Here, in the configuration example shown in FIG. 18 (a diagram showing another configuration example of the holding member 222 and the like), as shown in FIG. 18 (A), the can body 10 is formed into a cylindrical holding member 222. The pressing member 985 is provided to press against the outer peripheral surface of the. In other words, in this configuration example, the holding member 222 is pressed from the side where the ink discharge device 223 is provided and via the can body 10 to be formed in a disk shape and to rotate following the can body 10. The contact member 985 is pressed. To explain further, the end of the can body 10 on the opening side is pressed against the outer peripheral surface of the holding member 222.

  More specifically, in this configuration example, the ink from the ink discharge device 223 is attached to the portion indicated by the reference numeral 18A (see FIG. 18B) on the outer peripheral surface of the can 10. In this configuration example, as shown in FIG. 5B, in the circumferential direction of the can body 10, the location where the ink is attached coincides with the location where the pressing member 985 presses the can body 10. Yes.

  Here, in this configuration example, the portion of the can body 10 where the ink adheres is easily adhered to the holding member 222. In addition, in this configuration example, the size of the gap formed between the portion of the can 10 where the ink adheres and the holding member 222 is reduced and approaches a certain value. As a result, even in this configuration example, fluctuations in the separation distance between the ink ejection device 223 and the can 10 are suppressed, and deterioration in image quality is suppressed.

In this configuration example, the case where one ink ejection device 223 is provided has been described. However, as illustrated in FIG. 3, when a plurality of ink ejection devices 223 are provided, individual inks are provided. A plurality of pressing members 985 are preferably provided so as to correspond to the discharge device 223.
It is also preferable that the pressing member 985 is supported by the ink discharge device 223. In this case, the configuration for positioning the ink ejection device 223 with respect to the can 10 (holding member 222) can be simplified. Further, as shown by reference numeral 986 in FIG. 18A, the pressing member is preferably further provided on the bottom side of the can body 10 and the bottom side of the can body 10 is also pressed against the outer peripheral surface of the holding member 222. .

Further, the holding member 222 can be configured as shown in FIG. 19 (a diagram showing another configuration example of the holding member 222).
In the holding member 222, a spiral portion 222A in which a strip-shaped plate material is spirally wound a plurality of times, and a cylindrical base body 222B that is disposed inside the spiral portion 222A and supports the spiral portion 222A from the inside. Is provided. Further, the one end 222C of the spiral portion 222A is pressed so that the one end 222C moves along the circumferential direction of the spiral portion 222A, and the other end 222D of the spiral portion 222A is pressed around the periphery of the spiral portion 222A. A pressing mechanism (not shown) for pressing the other end 222D is provided so as to move along the direction. Here, in this configuration example, the one end 222C and the other end 222D are pressed by the pressing mechanism. As a result, the spiral portion 222A is deformed so that its diameter expands and is pressed against the inner peripheral surface of the can 10.

DESCRIPTION OF SYMBOLS 1 ... Printing machine, 10 ... Can body, 222 ... Holding member, 223 ... Ink discharge apparatus, 410 ... Holding member main body, 415 ... Exhaust hole, 422D ... 4th ventilation hole, 440 ... 1st moving member, 460 ... 1st Ring-shaped member, 905 ... protective member

Claims (14)

A support member that is inserted into the cylindrical body, supports the cylindrical body from the inside and rotates the cylindrical body in the circumferential direction;
An image forming unit that forms an image on the outer peripheral surface of the cylindrical body rotated by the support member;
With
The support member is
A support member body inserted into the cylindrical body;
A deformable member that is attached to the outer peripheral surface of the support member main body and has a facing portion facing the inner peripheral surface of the cylindrical body, and is deformable.
Deformation means for deforming the deformable member so that the facing part is directed to the inner peripheral surface of the cylindrical body;
Equipped with a,
A plurality of the deformation members are provided, and the plurality of deformation members are provided so that positions in the axial direction of the support member main body are different from each other.
A space located between the deforming members adjacent to each other among the plurality of deformable members, and a space located between the inner peripheral surface of the cylindrical body and the outer peripheral surface of the support member main body. An image forming apparatus comprising supply means for supplying air .   The image forming apparatus according to claim 1, wherein the deformable member is disposed along a circumferential direction of the support member main body.   The image forming apparatus according to claim 2, wherein the deformable member is formed in an annular shape.   The image forming apparatus according to claim 1, wherein the deforming unit deforms the deforming member after the support member main body is inserted into the cylindrical body. A support member that is inserted into the cylindrical body, supports the cylindrical body from the inside and rotates the cylindrical body in the circumferential direction;
An image forming unit that forms an image on the outer peripheral surface of the cylindrical body rotated by the support member;
With
The support member is
A support member body inserted into the cylindrical body;
A deformable member provided so as to be wound around the support member main body and provided so as to be wound around the support member main body more than once;
Deformation means for deforming the deformable member such that the outer diameter of the deformable member is increased;
Equipped with a,
The deformable member is arranged along the circumferential direction of the support member body and is formed in an annular shape,
A plurality of the deformation members are provided, and the plurality of deformation members are provided so that positions in the axial direction of the support member main body are different from each other.
The plurality of deformation members include a first deformation member and a second deformation member positioned closer to the base side of the support member body than the first deformation member,
With respect to a space located between the first deformable member and the second deformable member and located between the inner peripheral surface of the cylindrical body and the outer peripheral surface of the support member main body. Supply means for supplying air;
A tip side space that is air supplied to the space by the supply means and passes between the first deformable member and the inner peripheral surface of the cylindrical body and is located on the tip side of the support member body Discharging means for discharging the air leaked to the outside of the space on the tip side,
An image forming apparatus comprising: The support member body is formed such that the outer peripheral surface has a circular cross-sectional shape,
The image forming apparatus according to claim 5 , wherein the deformable member is disposed along a circumferential direction of the support member main body and is formed in an annular shape. A support member that is inserted into the cylindrical body, supports the cylindrical body from the inside and rotates the cylindrical body in the circumferential direction;
An image forming unit that forms an image on the outer peripheral surface of the cylindrical body rotated by the support member;
With
The support member is
A support member body inserted into the cylindrical body;
A deformable member provided so as to be wound around the support member main body and provided so as to be wound around the support member main body more than once;
Deformation means for deforming the deformable member such that the outer diameter of the deformable member is increased;
Equipped with a,
The deformation member is an image forming apparatus provided in a spiral shape . A support member that is inserted into the cylindrical body, supports the cylindrical body from the inside and rotates the cylindrical body in the circumferential direction;
An image forming unit that forms an image on the outer peripheral surface of the cylindrical body rotated by the support member;
With
The support member is
A support member body inserted into the cylindrical body;
A deformable member provided so as to be wound around the support member main body and provided so as to be wound around the support member main body more than once;
Deformation means for deforming the deformable member such that the outer diameter of the deformable member is increased;
Equipped with a,
An image forming apparatus in which a protective member for protecting the deformable member is provided outside the deformable member in the radial direction of the support member main body . A support member that is inserted into the cylindrical body, supports the cylindrical body from the inside and rotates the cylindrical body in the circumferential direction;
An image forming unit that forms an image on the outer peripheral surface of the cylindrical body rotated by the support member;
With
The support member is
A support member body inserted into the cylindrical body;
A deformable member that is attached to the outer peripheral surface of the support member main body and has a facing portion facing the inner peripheral surface of the cylindrical body, and is deformable.
And by supplying air to deform the deformable member, the deforming unit for I suited said facing portion in said peripheral surface of said tubular body to said deformable member,
An image forming apparatus comprising: A support member body inserted into a cylindrical body on which an image is formed and supporting the cylindrical body from the inside;
A deformation that is attached to the outer peripheral surface of the support member main body and has a facing portion that faces the inner peripheral surface of the cylindrical body when the support member main body is inserted into the cylindrical body. Members,
Deformation means for deforming the deformable member so that the facing part is directed to the inner peripheral surface of the cylindrical body;
Equipped with a,
A plurality of the deformation members are provided, and the plurality of deformation members are provided so that positions in the axial direction of the support member main body are different from each other.
A space located between the deforming members adjacent to each other among the plurality of deformable members, and a space located between the inner peripheral surface of the cylindrical body and the outer peripheral surface of the support member main body. A cylindrical body support member comprising supply means for supplying air . A support member body inserted into a cylindrical body on which an image is formed and supporting the cylindrical body from the inside;
A deformation that is attached to the outer peripheral surface of the support member main body and has a facing portion that faces the inner peripheral surface of the cylindrical body when the support member main body is inserted into the cylindrical body. Members,
Deformation means for deforming the deformable member so that the facing part is directed to the inner peripheral surface of the cylindrical body;
Equipped with a,
The deformable member is arranged along the circumferential direction of the support member body and is formed in an annular shape,
A plurality of the deformation members are provided, and the plurality of deformation members are provided so that positions in the axial direction of the support member main body are different from each other.
The plurality of deformation members include a first deformation member and a second deformation member positioned closer to the base side of the support member body than the first deformation member,
With respect to a space located between the first deformable member and the second deformable member and located between the inner peripheral surface of the cylindrical body and the outer peripheral surface of the support member main body. Supply means for supplying air;
A tip side space that is air supplied to the space by the supply means and passes between the first deformable member and the inner peripheral surface of the cylindrical body and is located on the tip side of the support member body Discharging means for discharging the air leaked to the outside of the space on the tip side,
A cylindrical body supporting member. A support member body inserted into a cylindrical body on which an image is formed and supporting the cylindrical body from the inside;
A deformation that is attached to the outer peripheral surface of the support member main body and has a facing portion that faces the inner peripheral surface of the cylindrical body when the support member main body is inserted into the cylindrical body. Members,
Deformation means for deforming the deformable member so that the facing part is directed to the inner peripheral surface of the cylindrical body;
Equipped with a,
The deformable member is a cylindrical body support member provided in a spiral shape . A support member body inserted into a cylindrical body on which an image is formed and supporting the cylindrical body from the inside;
A deformation that is attached to the outer peripheral surface of the support member main body and has a facing portion that faces the inner peripheral surface of the cylindrical body when the support member main body is inserted into the cylindrical body. Members,
Deformation means for deforming the deformable member so that the facing part is directed to the inner peripheral surface of the cylindrical body;
Equipped with a,
A cylindrical body support member provided with a protective member for protecting the deformable member outside the deformable member in the radial direction of the support member main body . A support member body inserted into a cylindrical body on which an image is formed and supporting the cylindrical body from the inside;
A deformation that is attached to the outer peripheral surface of the support member main body and has a facing portion that faces the inner peripheral surface of the cylindrical body when the support member main body is inserted into the cylindrical body. Members,
And by supplying air to deform the deformable member, the deforming unit for I suited said facing portion in said peripheral surface of said tubular body to said deformable member,
The cylindrical body support member provided with this.

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