JP5057581B2 - Printing plate cylinder, printing apparatus, and printing plate cylinder manufacturing method - Google Patents

Description

The present invention relates to a printing plate cylinder to which a sleeve-shaped printing plate is detachably attached, a printing apparatus including the printing plate cylinder, and a printing plate cylinder manufacturing method.

A sleeve-like printing plate used for various printings is fixed so as to be in close contact with the outer peripheral surface of the printing plate cylinder by inserting it into the printing plate cylinder, for example, as in Patent Document 1. A conventional printing plate cylinder is formed in a substantially cylindrical shape having a hollow air chamber, an air supply hole penetrating from the axial end surface into the air chamber, and an air outlet hole penetrating from the outer peripheral surface into the air chamber. Is formed.
In this printing plate cylinder, when the printing plate is fixed so as to block the air blowing holes on the outer peripheral surface thereof, if air is introduced into the air chamber from the air supply hole and the pressure of the air chamber is increased, this pressure increase is caused. Along with this, high-pressure air is blown out from the air blowing hole. Therefore, when the printing plate is attached to and detached from the printing plate cylinder, the printing plate can be expanded outward in the radial direction by the high-pressure air blown from the air blowing holes, so that the printing plate can be easily attached and detached. it can.
JP 2007-44987 A

However, the conventional printing plate cylinder has a large air chamber, so that there is a problem that its weight increases.
In addition, since this printing plate cylinder has low heat dissipation during printing, the viscosity of the ink is not stable, and it is difficult to create a constant printing state. As a result, there is a problem that unevenness occurs in printing.
Furthermore, after the printing plate is inflated with high-pressure air and mounted on the printing plate cylinder, there is also a problem that condensation tends to occur in the air chamber of the printing plate cylinder and in the air blowing holes. That is, in a state where the printing plate is inflated with high-pressure air and mounted on the printing plate cylinder, the air chamber is maintained at a high pressure. However, if the air supply pipe is removed from the air supply hole after the printing plate is mounted, the pressure in the air chamber is drastically reduced, and as a result, condensation occurs in the air chamber and the air blowing hole of the printing plate cylinder. Here, when the printing plate cylinder is made of a material that may rust, such as iron, dew condensation is a source of rust. And when rust arises in an air chamber or an air blowing hole, there exists a possibility that the detachability of the printing plate with respect to a printing plate cylinder may fall.

  The present invention has been made in view of such circumstances. A printing plate cylinder capable of reducing weight and improving heat dissipation, and also suppressing the occurrence of rust, a printing apparatus including the same, and manufacture of the printing plate cylinder. It aims to provide a method.

In order to solve the above-mentioned problems, a printing plate cylinder according to the present invention is a printing plate cylinder to which a sleeve printing plate having a cylindrical shape is detachably mounted, and a shaft portion rotatable around a central axis, and a cylinder A cylindrical portion that is coaxially arranged with the shaft portion and is spaced from the outer peripheral surface of the shaft portion, and an outer peripheral surface of the shaft portion and the cylindrical portion A rib that is integrally fixed to the inner peripheral surface and connects the shaft portion and the cylindrical portion, and the cylindrical portion is formed with an air blowing hole that opens to the outer peripheral surface, The rib is formed with an air supply path communicating with the air blowing hole, and the sleeve printing plate is mounted with an enlarged diameter by blowing air from the air blowing hole through the air supply path. and which, said tubular portion, and an inner tubular portion formed integrally with the rib, the outer peripheral surface of the inner tubular portion An outer cylindrical portion mounted on the inner side of the outer cylindrical portion, and the air blowing holes are formed so as to penetrate in the thickness direction of the outer cylindrical portion, and are arranged in the circumferential direction of the outer cylindrical portion. At least one of the outer peripheral surface of the cylindrical portion and the inner peripheral surface of the outer cylindrical portion is formed with an air flow groove that extends in the circumferential direction and communicates the air supply path and the plurality of air blowing holes. It is formed .
The air supply port for introducing air into the air supply path formed in the rib includes the outer surface of the rib, the outer peripheral surface and axial end surface of the shaft portion, the inner peripheral surface of the cylindrical portion, and the outer peripheral surface of the cylindrical portion. Of these, it can be formed at an arbitrary position such as a position where the sleeve printing plate is not disposed.

In the printing plate cylinder having this configuration, when high-pressure air is blown from the air blowing holes when the sleeve printing plate is mounted, the sleeve printing plate expands radially outward, so that the sleeve printing plate can be mounted smoothly. it can. In this configuration, even when high-pressure air is blown from the air blowing holes when removing the sleeve printing plate, the sleeve printing plate can be removed smoothly in the same manner.
According to this printing plate cylinder, since the shaft portion and the cylindrical portion are connected by the rib, the radial dimension of the shaft portion can be reduced, or the thickness of the cylindrical portion can be reduced. The weight can be easily reduced.

In addition, by connecting the shaft portion and the cylindrical portion with ribs, the gap area between the shaft portion and the cylindrical portion can be opened outward from both end portions in the axial direction of the printing plate cylinder. The printing plate cylinder can be efficiently cooled by flowing cooling air through the gap area. That is, it is possible to improve heat dissipation during printing, stabilize the viscosity of the ink, and prevent printing unevenness.
Further, this printing plate cylinder is only provided with a small volume air supply path, and does not have a large air chamber unlike the conventional printing plate cylinder, so even if the pressure in the air supply path drops rapidly. , The occurrence of condensation can be minimized. As a result, it is possible to suppress the occurrence of rust on the printing plate cylinder and to prevent the sleeve printing plate from being detached from the printing plate cylinder.

  In the printing plate cylinder, the cylindrical portion includes an inner cylindrical portion formed integrally with the rib, and an outer cylindrical portion attached to the outer peripheral surface of the inner cylindrical portion. preferable.

  Further, in the printing plate cylinder, the air blowing holes are formed so as to penetrate in the thickness direction of the outer cylinder part, and a plurality of the air blowing holes are arranged in the circumferential direction of the outer cylinder part, and the outer periphery of the inner cylinder part An air circulation groove that is formed to extend in the circumferential direction and communicates the air supply path and the plurality of air blowing holes is formed on at least one of the surface and the inner peripheral surface of the outer cylindrical portion. preferable.

According to the printing plate cylinder of this configuration, the high-pressure air introduced into the air supply path can be distributed in the circumferential direction by the air circulation groove, so that the number of air supply paths is smaller than the number of air blowing holes. However, the high-pressure air introduced into the air supply path can be evenly blown out from the air blowing holes.
In addition, in the printing plate cylinder having this configuration, it is possible to easily form an air supply path, an air flow groove, and an air blowing hole. Therefore, an air supply flow path that guides air from the air supply port to the air blowing hole is provided. Easy to configure. For example, the air supply path forms an axial hole extending along the axial direction from the axial end surface of the rib, and the radial direction extends radially inward from the outer peripheral surface of the inner cylindrical portion so as to communicate with the axial hole. It can be easily formed simply by forming a hole.

Furthermore, in the printing plate cylinder, a plurality of the air blowing holes and a plurality of air circulation grooves may be arranged side by side in the axial direction.
When the sleeve printing plate is attached to or detached from the printing plate cylinder, the sleeve printing plate is moved in the axial direction with respect to the printing plate cylinder. Since high-pressure air can be blown out from a plurality of locations in the axial direction, the expansion state of the sleeve printing plate by the high-pressure air can be maintained for a long time in the process of attaching and detaching the sleeve printing plate, and can be attached and detached more smoothly. It becomes possible.

Further, in the printing plate cylinder, a plurality of the ribs and the air supply passages formed on the ribs are formed while being shifted in the circumferential direction, and each of the air supply passages is a plurality of air circulations arranged in the axial direction. It is preferable to communicate with the groove individually.
In the case of this configuration, the supply of high-pressure air can be individually controlled with respect to a plurality of air blowing holes formed at a plurality of positions in the axial direction, so that the air blowing holes covered with the sleeve printing plate It becomes possible to blow out the high-pressure air from only. Accordingly, it is possible to efficiently attach and detach the sleeve printing plate while preventing the useless discharge of high-pressure air.

Furthermore, in the printing plate cylinder, the inner cylinder part and the outer cylinder part may be formed of different materials.
That is, the inner cylinder part may be formed of a material with good workability, and the outer cylinder part may be formed of a material having rigidity and corrosion resistance. As a specific example of this combination, the inner cylinder part is formed of carbon steel for mechanical structure, and the outer cylinder part is formed of stainless steel. In this case, the above-described forming process of the air circulation groove and the air blowing hole can be easily performed on the inner cylinder part and the rib formed integrally therewith. Further, it is possible to prevent the outer cylinder portion from being deformed or corroded by ink or the like during printing.

Moreover, the printing apparatus of this invention is comprised using the said printing plate cylinder.
According to this printing apparatus, the weight of the printing apparatus can be reduced by providing a lightweight printing plate cylinder. Moreover, since the occurrence of printing unevenness can be suppressed during printing, the yield of cans can be improved.
Further, since it is possible to suppress the occurrence of rust on the printing plate cylinder, it is possible to use the same printing plate cylinder for a long time without replacing it, and as a result, it is possible to reduce the running cost of the printing apparatus. .

And the manufacturing method of the printing plate cylinder which concerns on this invention is a method of manufacturing the said printing plate cylinder by which the said cylindrical part comprised the said inner cylindrical part and the said outer cylindrical part, Comprising: The said axial part The cylindrical member that is the material of the rib and the inner cylinder part is cut out in the axial direction to manufacture a core member that is integrally formed with the shaft part, the rib, and the inner cylinder part, and then the core member Is attached to the outer cylindrical portion.
According to the method for manufacturing a printing plate cylinder of the present invention, it is possible to obtain a core member in which a shaft portion, a rib, and an inner cylinder portion extending in the axial direction of a cylindrical member are integrally formed. And by attaching a core member to an outside cylinder part after completion of manufacture of a core member, it can prevent that a gap arises in an outside diameter size of an inside cylinder part to an inside diameter dimension of an outside cylinder part. That is, the inner cylinder part can be formed with high accuracy.

  In the printing plate cylinder manufacturing method, when the shaft portion, the rib, and the inner tube portion are formed by machining such as wire cutting or cutting, the shapes of the shaft portion, the rib, and the inner tube portion are changed. Furthermore, it can be finished with high accuracy.

  According to the present invention, it is possible to reduce the weight of the printing plate cylinder and prevent occurrence of printing unevenness during printing. In addition, it is possible to minimize the occurrence of condensation and to prevent the sleeve printing plate from being detached from the printing plate cylinder.

The printing plate cylinder according to the first embodiment of the present invention will be described below with reference to FIGS. As shown in FIGS. 1 to 3, the printing plate cylinder 1 of this embodiment includes a shaft portion 3 that is formed in a cylindrical shape, a cylindrical shape that is disposed coaxially with the shaft portion 3, and a shaft portion 3. And a plurality of (three in the illustrated example) that are connected between the cylindrical portion 5 and the shaft portion 3 and the cylindrical portion 5 that are integrally connected to each other. And a sleeve-like printing plate P (hereinafter referred to as a sleeve printing plate P, see FIG. 4) is fitted into the outer peripheral surface 5a of the cylindrical portion 5 so as to be in close contact therewith.
A shaft portion 2 (see FIG. 4) that is rotationally driven around a central axis O by a drive source (not shown) is inserted into the insertion hole 11 of the shaft portion 3 that penetrates in the axial direction. The shaft portion 3 is fixed to the shaft portion 2 by inserting the shaft portion 2 into the shaft portion 2. In this fixed state, the rotational force of the shaft portion 2 is transmitted to the shaft portion 3 and the printing plate cylinder 1 can be rotated around the central axis O.

  Each rib 7 is formed in a substantially plate shape that is narrow in the circumferential direction of the shaft portion 3 and the cylindrical portion 5, and extends from the outer peripheral surface 3 a of the shaft portion 3 to the inner peripheral surface 5 b of the cylindrical portion 5. And it is formed so that it may extend over the axial direction of the axial part 3. Specifically, each rib 7 is integrally fixed to the outer peripheral surface 3 a of the shaft portion 3 at one end located radially inward and is fixed to the inner peripheral surface 5 b of the cylindrical portion 5 integrally. ing. The plurality of ribs 7 are arranged at equal intervals in the circumferential direction of the shaft portion 3. Therefore, in this printing plate cylinder 1, by providing the rib 7 described above, the gap region S between the shaft portion 3 and the tubular portion 5 is opened outward from both end portions in the axial direction.

The cylindrical portion 5 includes an inner cylindrical portion 15 that forms the inner peripheral surface 5b thereof, and an outer cylindrical portion 17 that forms the outer peripheral surface 5a of the cylindrical portion 5 and is press-fitted without any gap to the outer peripheral surface 15a of the inner cylindrical portion 15. And is configured. That is, the inner cylindrical portion 15 is formed integrally with each rib 7 and is formed as an integral core member 19 together with the shaft portion 3 and the plurality of ribs 7.
The outer cylindrical portion 17 and the core member 19 may be formed of the same material, but may be formed of different materials. For example, the core member 19 may be formed of a material with good workability, and the outer cylindrical portion 17 may be formed of a material having rigidity and corrosion resistance. Specifically, the core member 19 is formed of carbon steel for mechanical structure, and the outer cylindrical portion 17 is formed of stainless steel.

In the core member 19, one air circulation groove 33 that is recessed from the outer peripheral surface 15 a of the inner cylindrical portion 15 is formed over the entire circumferential direction. In addition, an air supply path 35 that penetrates from one axial end surface (outer surface) to the outer peripheral surface 15 a side of the inner cylindrical portion 15 is formed in one rib 7. That is, an air supply port for introducing air into the air supply path 35 is formed on the axial end surface of the rib 7. The air supply path 35 opens at the bottom of the air circulation groove 33.
The air supply path 35 includes an axial hole 35A extending along the axial direction from the axial end surface of the rib 7 positioned on one axial end (left portion in the illustrated example) side of the core member 19, and the axial direction. It is comprised from the radial direction hole 35B extended in the radial inside from the bottom part of the air circulation groove | channel 33 so that it may communicate with the front-end | tip part of hole 35A.

The outer cylinder portion 17 is detachably attached to the inner cylinder portion 15, and a flange portion 21 that protrudes radially inward from the inner peripheral surface 17 b is formed at one axial end portion thereof. ing.
The flange portion 21 comes into contact with the axial end surface of the inner cylindrical portion 15 when the outer cylindrical portion 17 is press-fitted into the inner cylindrical portion 15, and the axial position of the outer cylindrical portion 17 with respect to the inner cylindrical portion 15 is determined. Plays the role of positioning. The inner diameter of the flange portion 21 is set to be larger than the inner diameter of the inner peripheral surface 5b of the inner cylindrical portion 15, and protrudes inward from the inner peripheral surface 5b of the inner cylindrical portion 15 in the press-fitted state. There is no.

A plurality of air blowing holes 37 penetrating in the thickness direction (radial direction) are formed in the outer cylindrical portion 17, and the plurality of air blowing holes 37 are equally spaced in the circumferential direction of the outer cylindrical portion 17. Is arranged through.
Since the plurality of air blowing holes 37 are arranged on the air circulation groove 33 in the state where the outer cylindrical portion 17 is mounted as described above, the air circulation groove 33 communicates with the air supply path 35. In the state in which the outer cylindrical portion 17 is attached to the core member 19, no gap is formed between the outer peripheral surface 15 a of the inner cylindrical portion 15 and the inner peripheral surface 17 b of the outer cylindrical portion 17. Together with the air supply path 35 and the air flow groove 33 formed in the core member 19, the air supply flow path 31 that penetrates from the axial end surface of the rib 7 to the outer peripheral surface 5 a of the cylindrical portion 5 is constituted. .

  In the illustrated example, the air circulation groove 33 and the plurality of air blowing holes 37 are arranged close to one end side in the axial direction of the printing plate cylinder 1, but are arranged, for example, in an intermediate position in the axial direction. Also good. When the air flow grooves 33 and the plurality of air blowing holes 37 are arranged close to each other as shown in the illustrated example, as shown in FIG. 4, the shaft portion 2 from the other end side in the axial direction of the printing plate cylinder 1. It is preferable to configure the printing plate cylinder 1 so as to be inserted.

The core member 19 and the outer cylindrical portion 17 are formed with a bottomed hole 41 and a through hole 42 for positioning their relative circumferential positions, respectively. That is, the core member 19 is formed with a bottomed bottomed hole 41 that is recessed from the outer peripheral surface 15a, and the outer cylindrical portion 17 is a through hole 42 having the same diameter as the bottomed hole 41 penetrating in the thickness direction. Is formed. And in the state which attached the outer side cylinder part 17 to the core member 19, the axial direction position of the bottomed hole 41 and the through-hole 42 corresponds. Therefore, in this state, the relative circumferential positions of the core member 19 and the outer cylindrical portion 17 are adjusted so that the bottomed hole 41 and the through hole 42 communicate with each other, and positioning is performed over the bottomed hole 41 and the through hole 42. By inserting the pin 43, the relative circumferential position of the core member 19 and the outer cylindrical portion 17 can also be positioned.
That is, the bottomed hole 41, the through hole 42 and the positioning pin 43 constitute a circumferential positioning means for positioning the relative circumferential position of the core member 19 and the outer cylindrical portion 17.

Next, a method for manufacturing the printing plate cylinder 1 having the above-described configuration will be described.
When manufacturing the printing plate cylinder 1, first, a cylindrical member (not shown) that is a material of the core member 19 is cut out in the axial direction, and the shaft portion 3, the rib 7, and the inner cylinder portion 15 are integrally formed. That is, the hollowed portion of the columnar member becomes the insertion hole 11 of the shaft portion 3 or the gap region S between the shaft portion 3 and the inner cylinder portion 15, and the core member 19 is manufactured thereby. In addition, although the hollowing process of the cylindrical member which shape | molds these axial parts 3, the rib 7, and the inner side cylinder part 15 can be implemented with various processing methods, it may be performed by mechanical processes, such as a wire cut process and a cutting process. More preferred. Then, after this hollowing process, the core member 19 is press-fitted (attached) to the outer cylindrical portion 17.
Note that the outer cylinder portion 17 having the flange portion 21 may be manufactured at least before the core member 19 is mounted. Further, the air circulation groove 33, the air supply path 35 and the bottomed hole 41 of the core member 19 and the air blowing hole 37 and the through hole 42 of the outer cylindrical portion 17 are previously formed in the cylindrical member before the formation of the gap region S described above. For example, it may be formed after the insertion hole 11 or the gap region S is formed. However, it is more preferable that the bottomed hole 41 and the through hole 42 are collectively formed in a state where the core member 19 is attached to the outer cylindrical portion 17.

Next, a method for attaching and detaching the sleeve-shaped sleeve printing plate P to the printing plate cylinder 1 will be described.
When the sleeve printing plate P is attached to or detached from the printing plate cylinder 1, high-pressure air is supplied into the air supply passage 35 from the air supply port of the air supply passage 35 opened in the axial end surface of the rib 7 to form a cylindrical shape. High-pressure air may be blown out from the air blowing holes 37 opened on the outer peripheral surface 5a of the portion 5, and the sleeve printing plate P may be moved in the axial direction with respect to the printing plate cylinder 1 in this state. At this time, since the sleeve printing plate P expands and expands in the radial direction by high-pressure air, the sleeve printing plate P can be smoothly attached and detached.
When the air circulation groove 33 and the plurality of air blowing holes 37 are arranged close to one end side in the axial direction of the printing plate cylinder 1 as shown in the illustrated example, the sleeve printing plate P is attached to the printing plate cylinder. It is more preferable to attach and detach from one end side in the axial direction. By doing in this way, in the process of moving the sleeve printing plate P in the axial direction, the state in which the sleeve printing plate P expands radially outward by the high-pressure air can be maintained for a longer time.

Further, when the sleeve printing plate P is mounted on the printing plate cylinder 1, it is more preferable to form an insertion hole 44 through which the positioning pin 43 is inserted in the sleeve printing plate P as shown in FIG. . When the sleeve printing plate P is mounted, it is preferable to insert the positioning pin 43 through the insertion hole 44, the through hole 42 and the bottomed hole 41 in a state where high-pressure air is blown out. The sleeve printing plate P can be easily positioned with respect to the cylinder 1.
In the illustrated example, the sleeve printing plate P is disposed on the entire outer peripheral surface 5a of the outer cylindrical portion 17. However, if the sleeve printing plate P is disposed so as to cover the air blowing holes 37, for example, the shaft of the outer peripheral surface 5a It may be arranged only in a part of the direction.

Next, a can printing apparatus 50 including the printing plate cylinder 1 on which the sleeve printing plate P is mounted will be described.
As shown in FIG. 5, the can printing apparatus 50 includes an ink adhesion mechanism 51 and a can moving mechanism 52.
The ink adhering mechanism 51 includes a plurality of inker units 55 provided for each color to be printed, and an outer peripheral surface of a substantially cylindrical work (can) 56 on which a size coat film is formed on the ink transferred from each inker unit 55. And a blanket wheel 57 for transferring the image.

Each inker unit 55 includes an ink source 61 filled with ink of a color to be printed, a ducting roller 62 that contacts the ink source 61 and receives ink, and delivers ink from the ducting roller 62 to the rubber roller 63. An intermediate roller 64 made up of a plurality of rollers and a printing plate cylinder 1 in contact with the rubber roller 63 are provided. A sleeve-shaped sleeve printing plate P having an image portion formed by laser engraving or etching is mounted on the outer peripheral surface of the printing plate cylinder 1, and the printing plate cylinder 1 is a shaft portion of a can printing apparatus 50. 2 is rotatably supported.
A plurality of blankets 66 that contact the sleeve printing plate P of the printing plate cylinder 1 are provided on the outer peripheral surface of the blanket wheel 57.

  The can moving mechanism 52 includes a can shooter 67 for taking in the work 56, a mandrel 68 for rotatably holding the work 56 supplied from the can shooter 67, and the work 56 mounted on the mandrel 68 in the direction of the ink adhering mechanism 51. And a mandrel turret 69 for rotational movement.

  In the can printing apparatus 50, sleeve printing in which different colors of ink from the ink source 61 of each inker unit 55 are mounted on the outer peripheral surface of the printing plate cylinder 1 via a ducting roller 62, an intermediate roller 64 and a rubber roller 63. It adheres to the plate P. Each ink is placed as a pattern on a blanket 66 on a blanket wheel 57 rotating from the sleeve printing plate P, and this pattern is printed while contacting the can body of the work 56 held by the mandrel 68. These ink patterns of each color are overlapped so that one pattern is printed on the can body. That is, the pattern printed on the can body is formed by overlapping the pattern of the image portion formed on the sleeve printing plate P of the printing plate cylinder 1 of each color.

According to the printing plate cylinder 1, since the shaft portion 3 and the cylindrical portion 5 are connected by the rib 7, the diameter of the shaft portion 3 is reduced or the thickness of the cylindrical portion 5 is reduced. Therefore, the printing plate cylinder 1 can be easily reduced in weight.
Further, by connecting the shaft portion 3 and the cylindrical portion 5 with the rib 7, the gap region S between the shaft portion 3 and the cylindrical portion 5 is opened outward from both end portions in the axial direction of the printing plate cylinder 1. Therefore, it is possible to efficiently cool the printing plate cylinder 1 by flowing cooling air through the gap area during printing. That is, it is possible to improve heat dissipation during printing, stabilize the viscosity of the ink, and prevent printing unevenness.

  Further, the printing plate cylinder 1 is formed only with a small volume air supply passage 31 extending from the rib 7 to the cylindrical portion 5, and does not have a large air chamber as in the conventional printing plate cylinder. For this reason, even if the pressure of the air supply channel 31 drops rapidly, the occurrence of condensation can be minimized. As a result, it is possible to suppress the occurrence of rust on the printing plate cylinder 1 and to prevent the sleeve printing plate P from being detached from the printing plate cylinder 1.

Further, the air supply channel 31 is constituted by the air supply channel 35, the air circulation groove 33, and the air blowing hole 37, so that the high-pressure air introduced into the air supply channel 35 is allowed to travel in the circumferential direction by the air circulation groove 33. Therefore, even if the number of the air supply passages 35 is smaller than the number of the air blowing holes 37, the high-pressure air introduced into the air supply passages 35 can be evenly blown out from the air blowing holes 37. It becomes.
Furthermore, the air supply path 35 and the air circulation groove 33 can be easily formed with respect to the core member 19, and the air blowing hole 37 can also be easily formed with respect to the outer cylindrical portion 17. The air supply channel 31 that guides the air to the air blowing hole 37 can be easily configured. For example, the air supply path 35 forms an axial hole 35A from the axial end surface of the rib 7, and forms a radial hole 35B from the outer peripheral surface 15a of the inner cylinder portion 15 so as to communicate with the axial hole 35A. It can be easily formed by just

Further, when the core member 19 or the columnar member that is a material thereof is formed of a material having good workability such as carbon steel for machine structure, the shaft portion 3, the rib 7, and the inner cylinder portion 15 are provided. The punching process for forming and the forming process of the air circulation groove 33 and the air supply path 35 can be easily performed.
Further, when the outer cylindrical portion 17 is formed of a material having rigidity and corrosion resistance such as stainless steel, the outer cylindrical portion 17 is deformed or ink is printed when printing on the can by the printing device 50. Can prevent corrosion.

And according to the printing apparatus 50 provided with this printing plate cylinder 1, the weight reduction of the printing apparatus 50 can be achieved by providing the lightweight printing plate cylinder 1. FIG. Moreover, since the occurrence of printing unevenness can be suppressed during printing, the yield of cans can be improved.
Further, since the occurrence of rust on the printing plate cylinder 1 can also be suppressed, it is possible to use the same printing plate cylinder 1 for a long period of time without replacing it. As a result, the running cost of the printing apparatus 50 is reduced. be able to.

  Further, according to the method for manufacturing the printing plate cylinder 1, after the cylindrical member is cut out in the axial direction to integrally form the shaft portion 3, the rib 7 and the inner cylindrical portion 15, the core member 19 is manufactured, and then the core member 19. Is press-fitted into the outer cylindrical portion 17, so that it is possible to prevent a deviation from occurring in the outer diameter dimension of the inner cylindrical portion 15 with respect to the inner diameter dimension of the outer cylindrical portion 17. That is, the inner cylinder portion 15 can be formed with high accuracy. In particular, the shape of the shaft part 3, the rib 7 and the inner cylinder part 15 can be finished with higher accuracy by performing the molding by machining such as wire cutting or cutting.

Next, a printing plate cylinder according to a second embodiment of the present invention will be described with reference to FIGS. As shown in FIGS. 6 and 7, the printing plate cylinder 71 of this embodiment is similar to the first embodiment in that the core member 19 integrally formed with the shaft portion 3, the plurality of ribs 7, and the inner cylindrical portion 15, The outer cylinder portion 17 is press-fitted without any gap to the outer peripheral surface 15a of the inner cylinder portion 15, but air supply that penetrates from the axial end surface of the rib 7 to the outer peripheral surface 5a of the cylindrical portion 5 is provided. The configuration of the flow path 73 is different from that of the first embodiment.
In this embodiment, four ribs 7 are formed. However, it is sufficient that a plurality of ribs 7 are arranged at least at equal intervals in the circumferential direction of the shaft portion 3. For example, 3 as in the first embodiment. One may be formed.

The air supply flow path 73 is formed from a plurality of air flow grooves 75A, 75B, 75C (three in the illustrated example) that are recessed from the outer peripheral surface 15a of the inner cylindrical portion 15 and the axial end face of one rib 7. An air supply passage 77 that penetrates to the bottom of each air circulation groove 75A, 75B, 75C, and a plurality of air outlet holes that penetrate in the thickness direction of the outer cylinder and are arranged on the air circulation grooves 75A, 75B, 75C. 79.
Each air circulation groove 75A, 75B, 75C is formed over the entire circumferential direction of the outer peripheral surface 15a of the inner cylinder portion 15 as in the first embodiment, and the plurality of air circulation grooves 75A, 75B, 75C are mutually connected. They are arranged side by side in the direction of the central axis O at intervals.

The air supply passage 77 has one axial hole 77A extending in the direction of the central axis O from the axial end surface of one rib 7 and the bottom of each air circulation groove 75A, 75B, 75C so as to communicate with the axial hole 77A. And a plurality of radial holes 77B, 77C, 77D (three in the illustrated example) extending radially inward.
The plurality of air blowing holes 79 arranged on the same air circulation groove 75A, 75B, 75C are arranged at equal intervals in the circumferential direction of the outer cylindrical portion 17, and each of the air blowing hole groups 79A. , 79B, 79C. The plurality of air blowing hole groups 79A, 79B, 79C are arranged side by side in the direction of the central axis O so as to match the arrangement of the plurality of air circulation grooves 75A, 75B, 75C.

The printing plate cylinder 71 having the above configuration can be manufactured in the same manner as in the first embodiment.
When the sleeve printing plate P is attached to or detached from the printing plate cylinder 71, as in the first embodiment, air supply from the air supply port 73 of the air supply flow path 73 opened in the axial end surface of the rib 7 is performed. High-pressure air is supplied into the flow path 73, and high-pressure air is blown out from the air blowing holes 79 of the air supply flow path 73 that opens to the outer peripheral surface 5a of the cylindrical portion 5. In this state, the sleeve printing plate P is printed. What is necessary is just to move to the plate cylinder 1 to an axial direction.
The printing plate cylinder 71 can also be used in the can printing apparatus 50 described in the first embodiment.

  According to the printing plate cylinder 71, the same effects as in the first embodiment can be obtained. Further, in this configuration, since the high-pressure air can be blown out from a plurality of positions in the axial direction of the outer peripheral surface 5a of the outer cylindrical portion 17, in the process of attaching and detaching the sleeve printing plate P, the expanded state of the sleeve printing plate P by the high-pressure air Can be maintained for a long time, and can be attached and detached more smoothly.

  Next, a printing plate cylinder according to a third embodiment of the present invention will be described with reference to FIGS. As shown in FIGS. 8 and 9, the printing plate cylinder 81 of this embodiment has a core member 19 in which the shaft portion 3, the plurality of ribs 7, and the inner cylinder portion 15 are integrally formed, as in the two embodiments described above. And the outer cylinder part 17 that is press-fitted without any gap to the outer peripheral surface 15a of the inner cylinder part 15, but differs from the above two embodiments in that a plurality of air supply flow paths are provided.

In the printing plate cylinder 81, a plurality of air circulation grooves 85A and 85B (two in the illustrated example) are formed in the inner cylinder portion 15 so as to be recessed from the outer peripheral surface 15a. It is arranged side by side in the axis O direction.
In addition, a plurality of air blowing holes 89 are formed in the outer cylindrical portion 17 so as to penetrate in the thickness direction and be arranged on the air circulation grooves 85A and 85B. A plurality of air blowing holes 89 arranged on the same air circulation groove 85A, 85B are arranged at equal intervals in the circumferential direction of the outer cylindrical portion 17, and air blowing hole groups 89A, 89B, respectively. Is configured. Further, the plurality of air blowing hole groups 89A and 89B are arranged side by side in the direction of the central axis O so as to be aligned with the arrangement of the plurality of air circulation grooves 85A and 85B.

A plurality of ribs 7 (four in the illustrated example) positioned symmetrically about the central axis O are penetrated from the axial ends to the bottoms of the separate air flow grooves 85A and 85B. Air supply paths 87 and 88 (two in the illustrated example) are formed. That is, the air supply paths 87 and 88 are individually communicated with the plurality of air circulation grooves 85A and 85B arranged in the axial direction.
Here, the first air supply path 87 communicating with the first air circulation groove 85A communicates with the axial hole 87A extending from the axial end surface of the rib 7 in the direction of the central axis O and the axial hole 87A. Thus, it is comprised from the radial direction hole 87B extended in the radial inside from the bottom part of 85 A of 1st air circulation grooves.

The second air supply path 88 communicating with the second air circulation groove 85B communicates with the axial hole 88A extending from the axial end surface of the rib 7 in the direction of the central axis O and the axial hole 88A. And a radial hole 88B extending radially inward from the bottom of the first air circulation groove 85B.
The first air supply channel 83A is configured by the first air circulation groove 85A, the first air supply path 87, and the first air outlet hole group 89A. The second air supply channel 83B is configured by the second air circulation groove 85B, the second air supply path 88, and the second air blowing hole group 89B.

The printing plate cylinder 81 having the above-described configuration can be manufactured in the same manner as in the above-described two embodiments, and can be used for the printing apparatus 50 of the same can.
And according to this printing plate cylinder 81, there exists an effect similar to the said two embodiment. Furthermore, it is possible to individually control the supply of high-pressure air for each of the air outlet hole groups 89A and 89B formed at each location in the axial direction. Therefore, when the sleeve printing plate P is moved in the axial direction and the sleeve printing plate P is attached to or detached from the printing plate cylinder 81, high-pressure air is supplied only from the air blowing hole groups 89A and 89B covered by the sleeve printing plate P. Can be blown out. That is, there is an effect that the sleeve printing plate P can be efficiently attached / detached by preventing the useless discharge of high-pressure air.

The present invention is not limited to the above-described three embodiments, and can be changed without departing from the spirit of the present invention. For example, although the air circulation grooves 33, 75 </ b> A to 75 </ b> C, 85 </ b> A, 85 </ b> B are formed on the outer peripheral surface 15 a of the inner cylinder portion 15, at least the air supply paths 35, 77, 87, 88 and the plurality of air blowing holes 37. 79, 89 may be formed so as to communicate with each other. That is, the air circulation grooves 33, 75 </ b> A to 75 </ b> C, 85 </ b> A, 85 </ b> B may be formed on the inner peripheral surface 17 b of the outer cylindrical portion 17, for example.
In this case, the air supply holes 35, 77, 89 open to the outer peripheral surface 15 a of the inner cylinder portion 15, with the air blowing holes 37, 79, 89 opening at the bottom of the air circulation grooves 33, 75 A to 75 C, 85 A, 85 B Opening portions 87 and 88 are arranged to face the air circulation grooves 33, 75A to 75C, 85A, and 85B. Further, the air circulation grooves 33, 75 </ b> A to 75 </ b> C, 85 </ b> A, 85 </ b> B may be formed on both the outer peripheral surface 15 a of the inner cylindrical portion 15 and the inner peripheral surface 17 b of the outer cylindrical portion 17, for example.

The air circulation grooves 33, 75A to 75C, 85A, 85B are formed on the outer peripheral surface 15a of the inner cylinder portion 15 and the inner peripheral surface 17b of the outer cylinder portion 17 over the entire circumferential direction. A plurality of grooves 33, 75A to 75C, 85A, 85B are formed in the circumferential direction, and the plurality of divided air flow grooves 33, 75A to 75C, 85A, 85B are individually provided with air supply paths 35, 77, 87, respectively. , 88 may be communicated. That is, in this case, the plurality of air circulation grooves 33, so that the air blowing holes 37, 79, 89 arranged in the circumferential direction are communicated with any one of the air supply paths 35, 77, 87, 88. 75A to 75C, 85A, and 85B may be formed.
Further, the air supply ports of the air supply paths 35, 77, 87, and 88 are formed on the end surface in the axial direction of the rib 7, but the present invention is not limited to this, and at least the air supply paths 35, 77, 87, 88 are formed. It suffices if it is formed at a position where air can be introduced. That is, the air supply port includes the outer surface of the rib 7 exposed outward, the outer peripheral surface 3 a and the axial end surface of the shaft portion 3, the inner peripheral surface 5 b of the cylindrical portion 5, and the outer peripheral surface 5 a of the cylindrical portion 5. It can be formed at an arbitrary position such as a position where the sleeve printing plate P is not disposed. Specific examples of the outer surface of the rib 7 include the side surface of the rib 7 extending along the central axis O in addition to the axial end surface of the rib 7.

The air supply passages 35, 77, 87, 88 are constituted by axial holes 35A, 77A, 87A, 88A and radial holes 35B, 77B to 77D, 87B, 88B extending in directions orthogonal to each other. It is sufficient that the rib 7 is formed so as to penetrate from the axial end face of the rib 7 to the air circulation grooves 33, 75A to 75C, 85A, 85B. That is, the air supply path 35 may be formed to extend linearly from the axial end surface of the rib 7 to the bottom of the air flow grooves 33, 75A to 75C, 85A, 85B so as to be inclined with respect to the axial direction, for example. Good.
Further, although the outer cylinder portion 17 is press-fitted without any gap to the outer peripheral surface 15a of the inner cylinder portion 15, at least the air circulation grooves 33, 75A to 75C, 85A, 85B and the air blowing holes 37, 79, 89. Since the communicating portion with the suffices to be sealed with respect to the outside, it is not particularly necessary to press-fit. That is, the inner circumferential surface 17b of the outer cylindrical portion 17 and the inner cylindrical portion 15 of the outer cylindrical portion 15 are located at positions away from the communication portion between the air circulation grooves 33, 75A to 75C, 85A, 85B and the air blowing holes 37, 79, 89. A gap may be formed between the outer peripheral surface 15a and the outer peripheral surface 15a. Therefore, when the printing plate cylinder 1 is manufactured, it is not always necessary to press the core member 19 into the outer cylindrical portion 17, and at least the columnar member may be attached to the outer cylindrical portion 17.

In addition, the core member 19 is manufactured by performing a punching process by a machining process such as a wire cutting process or a cutting process. However, the core member 19 is not limited to this, and may be manufactured by, for example, casting.
Furthermore, although the printing plate cylinder 1 is formed by being divided into the outer cylindrical portion 17 and the core member 19, these may be formed integrally. That is, the cylindrical part 5 may be configured such that the outer cylindrical part 17 and the inner cylindrical part 15 are integrally formed. In this case, without forming the air circulation grooves 33, 75 </ b> A to 75 </ b> C, 85 </ b> A, 85 </ b> B, the air supply passages 35, 77, 87, 88 formed in the rib 7 and the air formed in the tubular portion 5 are formed. What is necessary is just to form the blowing holes 37, 79, and 89 directly connected.
Even with this configuration, it is possible to reduce the weight of the printing plate cylinder 1 and improve the heat dissipation during printing as in the above-described embodiment, and it is also possible to suppress the occurrence of condensation.

In the printing plate cylinders 1, 71, 81 of the above embodiment, for example, fins that generate an air current in the gap region S along with the rotation thereof may be disposed. Specifically, as shown in FIG. 10, for example, the plurality of ribs 7 may be inclined so as to be twisted in the same circumferential direction about the central axis O and configured as the above-described fins.
In this case, since the printing plate cylinders 1, 71, 81 are rotated during printing and an air flow is generated in the gap region S, the printing plate cylinders 1, 71, 81 are cooled. It is possible to prevent the temperature from rising. Therefore, the temperature rise of the ink applied to the sleeve printing plate P attached to the printing plate cylinder 1, 71, 81 is suppressed, the ink viscosity is stabilized, and as a result, the occurrence of printing unevenness is more effectively prevented. Can do.
Further, by configuring the ribs 7 as fins, the printing plate cylinders 1, 71, 81 can be cooled without increasing the number of parts of the printing plate cylinders 1, 71, 81 or complicating the shape of the members. it can.

  Further, the high pressure air is blown out from the air blowing holes 37, 79, 89 when the sleeve printing plate P is attached to and detached from the printing plate cylinder 1, 71, 81. It may be performed when the sleeve printing plate P is attached to 71, 81. When removing the sleeve printing plate P from the printing plate cylinders 1, 71, 81, the sleeve printing plate P may be cut by, for example, a cutter.

1 is a schematic perspective view showing a printing plate cylinder according to a first embodiment of the present invention. It is a schematic sectional side view of the printing plate cylinder of FIG. It is a schematic perspective view which shows the state which isolate | separated the printing plate cylinder of FIG. 1 into the core member and the outer cylinder part. It is a schematic sectional side view which shows the state which fixed the shaft part and the sleeve printing plate to the printing plate cylinder of FIG. It is the schematic which shows the printing apparatus of the can using the printing plate cylinder of FIG. It is a schematic perspective view which shows the state by which the printing plate cylinder which concerns on 2nd Embodiment of this invention was fixed to the shaft part. It is a schematic sectional side view of the printing plate cylinder of FIG. It is a schematic perspective view which shows the state by which the printing plate cylinder which concerns on 3rd Embodiment of this invention was fixed to the shaft part. It is a schematic sectional side view of the printing plate cylinder of FIG. It is a partial permeation | transmission perspective view which shows the outline of the printing plate cylinder which concerns on other embodiment of this invention.

Explanation of symbols

1, 71, 81 Printing plate cylinder 3 Shaft portion 3a Outer peripheral surface 5 Tubular portion 5a Outer peripheral surface 5b Inner peripheral surface 7 Rib 15 Inner cylindrical portion 15a Outer peripheral surface 17 Outer cylindrical portion 17b Inner peripheral surfaces 31, 73, 83A, 83B Air Supply flow path 33, 75A to 75C, 85A, 85B Air flow groove 35, 77, 87, 88 Air supply path 37, 79, 89 Air outlet hole O Central axis P Sleeve printing plate

Claims (7)

A printing plate cylinder on which a cylindrical sleeve printing plate is detachably mounted,
A shaft that can rotate about a central axis;
A cylindrical portion that is formed in a cylindrical shape, is arranged coaxially with the shaft portion, and is arranged with a space between the outer peripheral surface of the shaft portion;
A rib that is integrally fixed to the outer peripheral surface of the shaft portion and the inner peripheral surface of the cylindrical portion, and connects the shaft portion and the cylindrical portion;
The cylindrical portion is formed with an air blowing hole that opens to the outer peripheral surface thereof.
The rib is formed with an air supply path communicating with the air blowing hole,
By blowing out air from the air blowing hole through the air supply path, the sleeve printing plate is configured to be expanded and attached ,
The cylindrical portion includes an inner cylindrical portion formed integrally with the rib, and an outer cylindrical portion attached to the outer peripheral surface of the inner cylindrical portion,
The air blowing holes are formed so as to penetrate in the thickness direction of the outer cylinder part, and are arranged in a plurality in the circumferential direction of the outer cylinder part,
At least one of the outer peripheral surface of the inner cylindrical portion and the inner peripheral surface of the outer cylindrical portion is formed so as to extend in the circumferential direction thereof, and communicates the air supply path and the plurality of air blowing holes. A printing plate cylinder in which grooves are formed . The printing plate cylinder according to claim 1, wherein a plurality of the air blowing holes and a plurality of air circulation grooves are arranged side by side in the axial direction. A plurality of the ribs and the air supply passages formed on the ribs are formed shifted in the circumferential direction,
The printing plate cylinder according to claim 2 , wherein each air supply path is individually communicated with a plurality of air circulation grooves arranged in the axial direction. The printing plate cylinder according to any one of claims 1 to 3, wherein the inner cylindrical portion and the outer cylindrical portion are formed of different materials. A printing device that prints on a can using a printing plate cylinder,
5. A printing apparatus for cans, wherein the printing plate cylinder according to claim 1 is used as the printing plate cylinder. A method for producing a printing plate cylinder according to any one of claims 1 to 4 ,
The core member which is the material of the shaft part, the rib and the inner cylinder part is cut out over the axial direction to produce the core member integrally formed with the shaft part, the rib and the inner cylinder part. A printing plate cylinder manufacturing method, wherein the core member is attached to the outer cylinder portion. The method for manufacturing a printing plate cylinder according to claim 6, wherein the shaft portion, the rib, and the inner cylindrical portion are formed by machining.

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