JP2015131418A - Alignment structure of sleeve printing plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable an enhancement in printing precision by improving an alignment precision of a sleeve printing plate to a cylinder.SOLUTION: An alignment structure 50 of a sleeve printing plate for aligning a cylindrical sleeve printing plate 30 with a cylinder 6 when the sleeve printing plate 30 is to be attached to an outer periphery of the cylinder 6, is characterized in that a notch 70 is formed in the sleeve printing plate 30 in its axis line direction, and in that a pin member 60 inserted into the notch 70 is projected on the outer periphery of the cylinder 6 to keep a length Win a circumferential direction CD along the axis line smaller than a length Win a circumferential direction CD of the pin member 60, and to turn the length Win a circumferential direction CD of the deformed notch into a size corresponding to the length Win a circumferential direction CD of the pin member 60 when the sleeve printing plate 30 is fitted to the outer periphery of the cylinder 6 while being expanded by elastic deformation.

Description

  The present invention relates to an alignment structure for a sleeve printing plate.

This type of sleeve printing plate is widely used in the fields of flexographic printing and letterpress printing, as described in, for example, Patent Document 1 below. Further, as described in Patent Document 2 below, a sleeve printing plate is also applied in the field of offset printing on a printing material such as a cylindrical can.
In the sleeve printing plate, the circumferential position of the image pattern is preset on the sleeve printing plate, so that the image pattern can be registered by aligning the sleeve printing plate and the cylinder, It is possible to reduce the time and labor required for the image pattern exchange work.

In Patent Document 2, a sleeve pin hole is provided at an end portion in the axial direction of a cylindrical sleeve (sleeve printing plate), and this sleeve pin hole engages with a sleeve pin protruding from the outer periphery of the cylinder. Accordingly, the relative positions of the sleeve printing plate and the cylinder in the circumferential direction and the axial direction are matched.
The sleeve is made of a plastic resin and can be elastically deformed. After the sleeve is expanded by high pressure air and inserted into the outer periphery of the cylinder, the sleeve is restored and deformed by stopping the supply of high pressure air ( The diameter is reduced) and is fixed in close contact with the cylinder.

JP 2006-326938 A JP 2006-272682 A

  However, the conventional sleeve printing plate alignment structure has room for improvement in further improving the alignment accuracy (positioning accuracy) of the sleeve printing plate with respect to the cylinder.

  The present invention has been made in view of such circumstances, and provides an alignment structure of a sleeve printing plate that can improve the alignment accuracy of the sleeve printing plate with respect to the cylinder and can increase the printing accuracy. It is an object.

In order to solve such problems and achieve the above object, the present invention proposes the following means.
That is, the present invention is a sleeve printing plate alignment structure for aligning the position of the sleeve printing plate with respect to the cylinder when the cylindrical sleeve printing plate is mounted on the outer periphery of the cylinder, The sleeve printing plate is formed with a notch at the end in the axial direction, and a pin member inserted into the notch is provided on the outer periphery of the cylinder so as to protrude around the axis of the notch. The circumferential length of the pin member is smaller than the circumferential length of the pin member, and is deformed when the sleeve printing plate is fitted to the outer periphery of the cylinder while being expanded in diameter by elastic deformation. The length of the cutout portion in the circumferential direction is a size corresponding to the length of the pin member in the circumferential direction.

When the sleeve printing plate is fitted to the outer periphery of the cylinder, the notch portion of the sleeve printing plate is also deformed to expand the diameter of the sleeve printing plate, and the circumferential direction of the notch portion (sleeve printing plate) The length in the direction along the axis of
Therefore, for example, a sleeve printing plate so that the circumferential length of the notched portion deformed as described above becomes a size corresponding to the circumferential length of the pin member protruding from the outer periphery of the cylinder. When the sleeve printing plate is fitted on the outer periphery of the cylinder, it is set in advance based on calculated values and empirical values based on the dimensional values of the material, Young's modulus, thickness, diameter, etc. The outer periphery and the inner periphery of the notch are brought into contact with each other in at least the circumferential direction of the sleeve printing plate, so that the sleeve printing plate is aligned (positioned) with respect to the cylinder with high accuracy.

  That is, when the sleeve printing plate is expanded and fitted to the outer periphery of the cylinder as in the prior art, the notch portion expands as the sleeve printing plate expands, and the inner periphery of the notch portion According to the present invention, it is possible to remarkably suppress such a problem that a gap is generated between the pin member and the outer periphery of the pin member, so that the alignment accuracy cannot be sufficiently secured and the printing accuracy is affected.

  In the present invention, “the circumferential length of the deformed notch is a size corresponding to the circumferential length of the pin member” means that the notched portion deformed by the diameter expansion of the sleeve printing plate. The circumferential length of the sleeve (the inner dimension of the notch along the circumferential direction of the sleeve printing plate) is equal to the circumferential length of the pin member (the outer dimension of the pin member along the circumferential direction of the sleeve printing plate). (The circumferential lengths are the same, or the circumferential length of the notch is slightly smaller than the circumferential length of the pin member). More specifically, when the notch is deformed and the pin member is inserted into the notch, and these are brought into the engaged state, the notch and the pin member are arranged in a region facing each other in the circumferential direction. Of these, it is meant that at least a part of the circumferential lengths is substantially the same.

  As described above, according to the alignment structure of the sleeve printing plate of the present invention, the alignment accuracy of the sleeve printing plate with respect to the cylinder can be further improved, and the printing accuracy can be increased. This also makes it possible to meet the demands for high-definition print quality (accuracy), and significantly reduce printing defects without requiring complicated adjustments, thereby improving productivity and product yield. The

  In the sleeve printing plate alignment structure of the present invention, when the sleeve printing plate is mounted on the outer periphery of the cylinder, the notch is brought into contact with the pin member from the axial direction. It is good as well.

  In this case, the notch portion and the pin member come into contact with each other at least three places on both side portions along the circumferential direction of the sleeve printing plate and one side portion along the axial direction, thereby restricting relative movement of each other. . In other words, not only the circumferential alignment of the sleeve printing plate with respect to the cylinder described above but also the axial alignment can be performed with high accuracy by using the notch portion and the pin member. Can be significantly increased.

  In the sleeve printing plate alignment structure of the present invention, a pair of the notched portions before deformation extends along the axial direction and is opposed to each other in parallel with a gap in the circumferential direction. The distance between the pair of sides in the notch may be smaller than the circumferential length of the pin member.

  In this case, when the sleeve printing plate is fitted to the outer periphery of the cylinder, the pair of side portions extending along the axial direction in the notch portion are easily brought into contact with the pin member reliably, and the above-described effect. Becomes more prominent and stable.

  In the sleeve printing plate alignment structure of the present invention, the length in the circumferential direction of the notched portion before deformation is a central portion of the sleeve printing plate along the axial direction of the notched portion. It is good also as being made small by the edge part side part compared with.

Since the notch is open at the end along the axial direction of the sleeve printing plate, when the diameter of the sleeve printing plate is expanded, the end of the sleeve printing plate along the axial direction is formed at the notch. The deformation amount at the portion side portion (opening portion) tends to be larger than the deformation amount at the center side portion of the sleeve printing plate along the axial direction.
Therefore, with the above-described configuration, when the sleeve printing plate is expanded in diameter, the circumferential length of the notch can be made uniform over the entire area in the axial direction. The contact area with the member can be increased, and these engagement states become more reliable and stable.

  Further, in the sleeve printing plate alignment structure of the present invention, the pin member is formed with a pair of wall portions arranged in the circumferential direction, and a distance along the circumferential direction between the pair of wall portions. However, it is good also as being enlarged by the edge part side part compared with the center side part of the said cylinder along the said axial direction among this pin member.

  In this case, when the sleeve printing plate is fitted to the outer periphery of the cylinder, it corresponds to the shape of a pair of wall portions facing both sides in the circumferential direction in the pin member (that is, arranged in the back direction in the circumferential direction), The pair of side portions of the notch is deformed (that is, the pair of side portions become non-parallel to each other), and the pair of wall portions and the pair of side portions are surely brought into contact with each other in a wider range. Become. Therefore, the above-described effect can be obtained stably.

  According to the sleeve printing plate alignment structure of the present invention, it is possible to improve the printing accuracy by improving the alignment accuracy of the sleeve printing plate with respect to the cylinder. This also makes it possible to meet the demands for high-definition print quality (accuracy), and significantly reduce printing defects without requiring complicated adjustments, thereby improving productivity and product yield. The

It is a figure explaining the schematic structure of the offset printing apparatus which is provided with the position alignment structure of the sleeve printing plate which concerns on one Embodiment of this invention, and prints on a can. It is a perspective view which shows the cylinder and sleeve printing plate which are used for the offset printing apparatus of FIG. It is a figure which shows the pin member protrudingly provided by the outer periphery of the cylinder as a cross section perpendicular | vertical to the radial direction of this cylinder. In the sleeve printing plate alignment structure according to one embodiment of the present invention, (a) the shape of the notch portion of the sleeve printing plate before being mounted on the cylinder (before deformation) and the shape of the pin member of the cylinder The figure to compare, (b) It is a figure which shows the engagement state of the notch part of the sleeve printing plate after mounting | wearing to a cylinder (after deformation | transformation), and the pin member of a cylinder. It is a modification of the positioning structure of the sleeve printing plate which concerns on one Embodiment of this invention, (a) The shape of the notch part of the sleeve printing plate before mounting | wearing with a cylinder (before deformation | transformation), and the pin member of a cylinder FIG. 6B is a diagram showing the engagement state between the notch portion of the sleeve printing plate after being mounted on the cylinder (after deformation) and the pin member of the cylinder. It is a modification of the positioning structure of the sleeve printing plate which concerns on one Embodiment of this invention, (a) The shape of the notch part of the sleeve printing plate before mounting | wearing with a cylinder (before deformation | transformation), and the pin member of a cylinder FIG. 6B is a diagram showing the engagement state between the notch portion of the sleeve printing plate after being mounted on the cylinder (after deformation) and the pin member of the cylinder. FIG. 5A is a modified example of the alignment structure of the sleeve printing plate according to the embodiment of the present invention, and FIG. 5A is a diagram showing the shape of the notch portion of the sleeve printing plate before being mounted on the cylinder (before deformation); FIG. 3 is a diagram showing the shape of a pin member of a cylinder. In the conventional sleeve printing plate alignment structure, (a) a view comparing the shape of the notch of the sleeve printing plate before being mounted on the cylinder (before deformation) and the shape of the pin member of the cylinder; FIG. 4 is a diagram showing an engagement state between a notch portion of a sleeve printing plate after being mounted on a cylinder (after deformation) and a pin member of the cylinder. It is a figure which shows the "position shift amount measurement mark" used for the registration confirmation test of the Example and comparative example of this invention.

A sleeve printing plate alignment structure 50 according to an embodiment of the present invention will be described below with reference to the drawings.
The sleeve printing plate alignment structure 50 of this embodiment is provided in the cylinder 6 of the offset printing apparatus A shown in FIG. 1 and the sleeve printing plate 30 shown in FIG. This is a structure for aligning (positioning) the sleeve printing plate 30 with respect to the cylinder 6 when the formed sleeve printing plate 30 is mounted on the outer periphery of the cylinder 6.

In FIG. 1, an offset printing apparatus A of the present embodiment is a can printing apparatus that performs printing on an outer peripheral surface of a can 20 that is a cylindrical substrate, and the offset printing apparatus A includes an ink adhesion mechanism B, A can moving mechanism C.
The ink adhering mechanism B prints (transfers) the inker unit 1 that supplies ink and the outer surface of the can 20 after contacting the inker unit 1 and copying the ink. And a blanket wheel 8 having a blanket 9 on its outer periphery.

  The inker unit 1 includes an ink source 2, a ducting roll 3 that contacts the ink source 2 and receives ink, an intermediate roller 4 composed of a plurality of rollers connected to the ducting roll 3, and a rubber roller connected to the intermediate roller 4 5 and a cylinder 6 connected to the rubber roller 5. The cylinder 6 is rotatably supported in a cantilevered state on a shaft portion (not shown) of the printing apparatus A.

The cylinder 6 has a cylindrical shape or a columnar shape, and a cylindrical sleeve printing plate 30 shown in FIG. 2 is detachably fitted to the outer peripheral surface of the cylinder 6. In a state where the sleeve printing plate 30 is mounted on the outer periphery of the cylinder 6, the cylinder 6 and the sleeve printing plate 30 are arranged coaxially with each other with the axis O as a common axis.
Further, on the outer peripheral surface of the sleeve printing plate 30, a printing plate for printing a can (hereinafter sometimes abbreviated as a letterpress) 40 having an image portion laser engraved in the same shape as the image pattern transferred to the can 20, A plurality of or only one is provided around the axis O of the sleeve printing plate 30 at intervals. Detailed configurations of the cylinder 6 and the sleeve printing plate 30 will be described later.

  In FIG. 1, a plurality of blankets 9 are provided on the outer peripheral surface of the blanket wheel 8, and these blankets 9 are in contact with the relief plate 40 of the sleeve printing plate 30 mounted on the outer peripheral surface of the cylinder 6. It is comprised so that 20 may also be contacted.

  The can moving mechanism C sequentially injects the can shooter 10 that takes the can 20 into the printing apparatus A, the mandrel 11 that rotatably holds the can 20 supplied from the can shooter 10, and the can 20 attached to the mandrel 11. And a mandrel turret 12 that rotates and moves toward the attachment mechanism B.

  In the offset printing apparatus A configured as described above, inks of different colors are respectively supplied from the ink sources 2 of the plurality of inker units 1 through the ducting roll 3, the intermediate roller 4, and the rubber roller 5. The ink of each color is placed on the blanket 9 on the rotating blanket wheel 8 as an image pattern, and is attached to the relief plate 40 of the sleeve printing plate 30 disposed on the outer peripheral surface, and this image pattern is held on the mandrel 11. The printing can be performed while contacting the can 20.

  Here, in this specification, the central axis (common axis) of the cylinder 6 and the sleeve printing plate 30 is referred to as an axis O. Further, the direction toward the base of the shaft portion of the printing apparatus A along the axis O direction (the direction in which the axis O extends and may be referred to as the axial direction AD hereinafter) is the back side (or the base end side, the left side in FIG. 2). ), And the direction toward the opposite side (front end side of the shaft portion) of the shaft portion of the printing apparatus A along the axis O direction is referred to as the front side (or the front end side, the right side in FIG. 2). A direction perpendicular to the axis O is referred to as a radial direction, and a direction around the axis O is referred to as a circumferential direction CD.

2, the cylinder 6, for example an outer diameter _{D A} is 100 to 250 mm, a length along the axial direction AD are the 50 to 500 mm. Specifically, in this embodiment, the outer diameter _{D A} of the cylinder 6 is 226 mm, length along the axial direction AD has become 178 mm.
A plurality of air holes 13 through which compressed air (high pressure air) can be ejected are formed on the outer periphery (outer peripheral surface) of the cylinder 6. A pin member 60 is provided on the outer periphery of the cylinder 6 so as to protrude outward along the radial direction of the cylinder 6. In the example shown in the drawing, one pin member 60 extending in the radial direction protrudes from one end portion (end portion on the back side of the cylinder 6) of both end portions along the axial direction AD on the outer periphery of the cylinder 6, A plurality of air holes 13 pierced in the radial direction are opened at intervals in the circumferential direction CD at the other end (the end on the near side of the cylinder 6).

In the cross-sectional view of the pin member 60 shown in FIG. 3 (the cross-sectional view perpendicular to the radial direction of the cylinder 6), the pin member 60 has a substantially rectangular shape. The end on the near side along the axial direction AD (the end located on the center side of the cylinder 6 along the axial direction AD of the pin member 60, the lower end in FIG. 3) is semicircular, and the other portions Is rectangular.
In this embodiment, the semi-cylindrical length along the axial direction AD of the pin member 60 (depth) _{L A} is 6 mm, the along the length circumferential direction CD (width) _{W A} is located 6 mm, the end portion of the front side The curvature radius _RA of the outer peripheral surface of the part is 3 mm. Since the front end of the pin member 60 has a semi-cylindrical shape with a semicircular cross section, the pin member 60 is inserted into a notch 70 of the sleeve printing plate 30 described later. It is easy to be guided smoothly when it is done. Further, in the pin member 60, portions other than the semi-cylindrical portion located at the end on the near side have a rectangular parallelepiped shape.

In addition, the pin member 60 is formed with a pair of wall portions 61 that are arranged in a back direction in the circumferential direction CD (arranged back to back) and have a planar shape. (Corresponding to the width W _A) distance along the pair of wall portions 61 each other in the circumferential direction CD is constant over the entire region along the axial direction AD of the wall portion 61. That is, the pair of wall portions 61 of the pin member 60 extend along the axial direction AD, and are disposed in a back-facing manner at intervals in the circumferential direction CD.

  In FIG. 2, the sleeve printing plate 30 includes a cylindrical sleeve support 31 that extends along the axial direction AD, and a plate member 32 disposed on the outer peripheral side of the sleeve support 31. In the present embodiment, the plate member 32 is formed integrally with the sleeve support 31.

The sleeve support 31 is formed of a predetermined material selected from, for example, a fiber reinforced plastic (FRP), a metal material such as Ni or SUS, or a resin material such as polyethylene terephthalate (PET) or polyvinyl chloride (vinyl chloride). In addition, the diameter can be increased by elastic deformation, and the diameter can be reduced by restoring deformation from the expanded state. In this embodiment, the sleeve support 31 is formed of FRP. Sleeve support 31 is, for example, an inner diameter _{D B} 100 to 250 mm, length along the axial direction AD is 50 to 500 mm, wall thickness is a 0.25～2Mm.

  The plate 32 is made of a photosensitive resin that can be engraved with laser light, and has a cylindrical shape with a thickness of 0.5 to 1.0 mm, for example. A plurality of or one relief plate 40 having an image pattern (printing design) formed by laser processing (laser engraving) is engraved on the outer peripheral surface of the plate member 32 at intervals in the circumferential direction CD. . Although not particularly illustrated, in the present embodiment, two relief plates 40 are provided on the outer peripheral surface of the plate material 32, and these relief plates 40 are arranged so as to face each other across the axis O.

  Further, the relief plate 40 has an image portion to which ink is attached and a non-image portion to which ink is not attached on the plate surface to be the image pattern. The image pattern of the relief plate 40 is formed by engraving with any one of a carbon dioxide laser, a YAG laser, an excimer laser, and a semiconductor laser.

The inner diameter D _B of the sleeve printing plate 30 before being expanded by the elastic deformation is smaller than the outside diameter D _A of the cylinder 6. Specifically, in this embodiment, the inner diameter _{D B} of the sleeve printing plate 30 is a 225.5Mm, 0.5 mm smaller than the outer diameter _{D A} of the cylinder 6. Further, the thickness of one side of the sleeve printing plate 30 (thickness in the radial direction) is 1.3 mm, of which the thickness of the sleeve support 31 is 0.6 mm and the thickness of the plate 32 is 0.7 mm. Yes. The length along the axial direction AD of the sleeve printing plate 30 is the same as or slightly larger than the length along the axial direction AD of the cylinder 6.

  The sleeve printing plate 30 is formed with a notch 70 at the end in the axial direction AD. Specifically, the notch portion 70 is configured to place the sleeve printing plate 30 in the radial direction at one end portion (the end portion on the back side of the sleeve printing plate 30) among both end portions along the axial direction AD of the sleeve printing plate 30. And one opening is formed toward the back side.

  FIG. 4A shows a front view of the notch 70 before the sleeve printing plate 30 expands due to elastic deformation (before deformation) (front view when the sleeve printing plate 30 is viewed inward in the radial direction). ), The cutout portion 70 has a substantially rectangular hole shape. Specifically, in this front view, the front end portion along the axial direction AD of the cutout portion 70 (the shaft of the cutout portion 70). The end located on the center side of the sleeve printing plate 30 along the direction AD, the lower end in FIG. 4, has a half-moon shape, and the other portion has a rectangular shape. Further, the inner peripheral edge of the notch 70 has a U-shape that opens toward the back side (the upper side in FIG. 4) of the sleeve printing plate 30.

Expanding Then, the length along the circumferential direction CD of the cutout portion 70 (width) W _B is smaller than the length W _A along the circumferential direction CD of the pin member 60, the sleeve printing plate 30 by the elastic deformation being the diameter when fitted to the outer periphery of the cylinder 6, as shown in FIG. 4 (b), the length W _B of the circumferential direction CD of the deformed cutout portion 70, the pin members 60 circumferentially CD of it the size corresponding to the length W _a, thereby, the pin member 60 is insertable and while engaged tightly engaged in the notches 70.

Specifically, in FIG. 4A, the notched portion 70 before deformation extends along the axial direction AD, and is opposed to each other in parallel in the circumferential direction CD so as to be linear. A pair of side portions 71 is formed. (Corresponding to the width W _B) distance along the circumferential direction CD between the pair of side portions 71 is constant over the entire region along the axial direction AD of side portions 71. The distance between the pair of side portions 71 of the notches 70 is smaller than the length W _A of the circumferential direction CD of the pin member 60. That is, the distance between the pair of side portions 71 of the notch portion 70 is smaller than the distance between the pair of wall portions 61 of the pin member 60.
In addition, in the notched portion 70 before deformation shown in FIG. 4A, the arc-shaped portion connecting the pair of side portions 71 (the end portion on the near side of the inner periphery of the notched portion 70) is the center thereof. The angle is set smaller than 180 °.

In this embodiment, the length along the axial direction AD of the notch 70 (depth) _{L B} 6 mm, length along the circumferential direction CD is (width) _{W B} 5.8 mm, located at the end of the front side the radius of curvature R _B of the inner peripheral surface of the arcuate portion is in the 3 mm.

When the sleeve printing plate 30 is mounted on the outer periphery of the cylinder 6, the inner periphery of the notch 70 is brought into contact with the outer periphery of the pin member 60 from both sides of the circumferential direction CD and the axial direction AD It comes to contact also from.
Specifically, in FIG. 4B, when the pin member 60 is inserted into the notch portion 70 and these are brought into an engaged state, the pair of side portions 71 of the notch portion 70 is paired with the pair of pin members 60. The front end (arc-shaped portion) of the notch 70 is in axial contact with the front end (semi-columnar portion) of the pin member 60. Abutting from AD. That is, the notch portion 70 and the pin member 60 are in contact with each other at least at three locations on both side portions in the circumferential direction CD and on one side portion (front side portion) along the axial direction AD.

  In the example shown in FIG. 4B, the front end portion (arc-shaped portion) of the notch portion 70 and the front end portion (semi-columnar portion) of the pin member 60 are formed of these end portions. They are in contact with each other over the entire circumference. Further, the pair of side portions 71 of the cutout portion 70 and the pair of wall portions 61 of the pin member 60 abut on each other at least on the near side portion along the axial direction AD of the side portion 71 and the wall portion 61. ing. Specifically, the pair of side portions 71 and the pair of wall portions 61 are in contact with each other in a region of 1/3 or more of the total length along the axial direction AD of the side portions 71 and the wall portion 61, more preferably. , ½ or more in contact with each other. In FIG. 4B, the range indicated by the symbol F represents the contact area between the notched portion 70 and the pin member 60 in the engaged state.

In the sleeve printing plate alignment structure 50 according to the present embodiment described above, when the sleeve printing plate 30 is fitted to the outer periphery of the cylinder 6, compressed air is ejected from the air holes 13 of the cylinder 6. The sleeve printing plate 30 slides toward the back side (left side in FIG. 2) along the axial direction AD with respect to the cylinder 6 while forming an air layer between the outer periphery of the sleeve 6 and the inner periphery of the sleeve printing plate 30. Then, it is mounted so as to cover the outer periphery of the cylinder 6. In this case, the sleeve printing plate 30 is expanded by air pressure, are notches 70 of the sleeve printing plate 30 is also deformed, the length of the circumferential direction CD of the cutout portion 70 (width) W _B is large Become.

In this embodiment, the length W _B of the circumferential direction CD of the cutout portion 70 which is deformed as described above, the length of the circumferential direction CD of the pin member 60 projecting from the outer periphery of the cylinder 6 (width ) so that the size corresponding to the W _a, for example, the sleeve printing plate 30 (the sleeve support 31, the material of the plate material 32), Young's modulus, based on the thickness and the like, each dimension such as diameter calculated values and experience values When the sleeve printing plate 30 is fitted to the outer periphery of the cylinder 6, the outer periphery of the pin member 60 and the inner periphery of the notch 70 are brought into contact with each other at least in the circumferential direction CD. Thus, the positioning (positioning) of the sleeve printing plate 30 with respect to the cylinder 6 is performed with high accuracy.
After the sleeve printing plate 30 is put on the outer periphery of the cylinder 6 and the notch 70 and the pin member 60 are engaged, the supply of compressed air is stopped, so that the sleeve printing plate 30 is restored and deformed (reduced). And is in close contact with and fixed to the cylinder 6. At this time, as the sleeve printing plate 30 is reduced in diameter, the cutout portion 70 is also deformed, and the inner periphery of the cutout portion 70 is pressed (pressed) against the outer periphery of the pin member 60. Therefore, the engagement state between the notch 70 and the pin member 60 and the alignment state between the sleeve printing plate 30 and the cylinder 6 are stably maintained.

That is, when the sleeve printing plate is expanded and fitted to the outer periphery of the cylinder as in the prior art, the notch portion expands as the sleeve printing plate expands, and the inner periphery of the notch portion According to the present embodiment, a problem that a gap is generated between the outer periphery of the pin member and the positioning accuracy cannot be sufficiently ensured and the printing accuracy is affected is remarkably suppressed according to the present embodiment.
Here, what is shown in FIGS. 8A and 8B is a conventional sleeve printing plate alignment structure 100. In the sleeve printing plate alignment structure 100, in FIG. 8 (a), the length _{W B} of the circumferential direction CD of the undeformed notches 107, same as the length _{W A} of the circumferential direction CD of the pin member 106 When the sleeve printing plate is fitted to the outer periphery of the cylinder while being expanded in diameter by elastic deformation, as shown in FIG. 8B, the length W in the circumferential direction CD of the deformed notch 107 is obtained. _B is greater than the length W _a of the circumferential direction CD of the pin member 106, the contact area F between the outer periphery of the inner circumference and the pin member 106 in this order notches 107, these notches 107 and the pin member It is a narrow range of only the arc-shaped portion located at the end on the near side of 106.
That is, in the conventional example shown in FIG. 8B, in a region where the notch portion 107 and the pin member 106 are arranged opposite to each other in the circumferential direction CD (a portion other than the arc-shaped portion), a portion where they are in contact with each other Therefore, it is difficult to ensure sufficient positional accuracy in the circumferential direction CD of the sleeve printing plate with respect to the cylinder.

Incidentally, it referred to in the embodiment of the present invention, the "length W _B of the circumferential direction CD of the cutout portion 70 which is deformed, the size corresponding to the length W _A of the circumferential direction CD of the pin member 60 ', the sleeve circumferential length in the direction CD (circumferential inner dimensions of the notches 70 along the direction CD) W _B is, in the circumferential direction CD of the pin member 60 the length of the cutout portion 70 deformed by diameter of the printing plate 30 ( the length W _a of (circumferential direction CD are substantially the _same, the W _B becomes the same as each other with respect to outer dimensions) W _a of the pin member 60 along the circumferential direction CD, or circumferential length of the notch 70 W _B is pointing to to) be slightly smaller than the circumferential length W _a of the pin member 60. More specifically, when the notch portion 70 is deformed and the pin member 60 is inserted into the notch portion 70 and is engaged, the notch portion 70 and the pin member 60 are in the circumferential direction CD. of the length W _a of the circumferential direction _CD, is W _B is substantially equal to each other (and the pair of side portions 71 and a pair of wall portions 61 regions disposed opposite in the present embodiment) area which is opposed to the Indicates that at least a part is provided.

  As described above, according to the sleeve printing plate alignment structure 50 of the present embodiment, the alignment accuracy of the sleeve printing plate 30 with respect to the cylinder 6 can be improved, and the printing accuracy can be increased. This also makes it possible to meet the demands for high-definition print quality (accuracy), and significantly reduce printing defects without requiring complicated adjustments, thereby improving productivity and product yield. The

Further, in this embodiment, when the sleeve printing plate 30 is mounted on the outer periphery of the cylinder 6, the notch 70 is formed with respect to the pin member 60 from the axial direction AD (from the near side to the far side along the axial direction AD). And the following effects are achieved.
That is, according to the above-described configuration, the notch portion 70 and the pin member 60 are both side portions along the circumferential direction CD (both ends of the circumferential direction CD) and one side portion along the axial direction AD (end portion on the near side). Thus, at least three places come into contact with each other, and relative movement of each other is restricted. That is, using the notch portion 70 and the pin member 60, not only the alignment of the sleeve printing plate 30 with respect to the cylinder 6 in the circumferential direction CD but also the alignment in the axial direction AD can be performed with high accuracy. With this structure, the printing accuracy can be remarkably increased.

In the present embodiment, the notched portion 70 before deformation is formed with a pair of side portions 71 that extend along the axial direction AD and are opposed to each other in parallel in the circumferential direction CD. cage, a distance between the pair of side portions 71 of the cutout portion 70 (corresponding to the width W _B) is, since it is smaller than the length W _a of the circumferential direction CD of the pin member 60, the following effects .
That is, according to the above configuration, when the sleeve printing plate 30 is fitted to the outer periphery of the cylinder 6, the pair of side portions 71 that extend along the axial direction AD in the notch portion 70 are formed with respect to the pin member 60. It becomes easy to reliably contact, and the above-described effect becomes more remarkable and stable.

Here, a modified example of the present embodiment will be described with reference to FIGS.
Sleeve In the modification of FIG. 5, as shown in FIG. 5 (a), the length W _B of the circumferential direction CD of the undeformed notches 70 of the notched portion 70, along the axial direction AD Compared to the central side portion of the printing plate 30 (the front side portion of the sleeve printing plate 30, the lower side portion of the notch 70 in FIG. 5A), the end side portion (the back side portion of the sleeve printing plate 30, It is made smaller at the upper part of the notch 70 in FIG.
Specifically, in the inner periphery of the cutout portion 70, the distance between a pair of side portions 71 arranged to face each other with a gap in the circumferential direction CD is from the front side to the back side of the cutout portion 70 (FIG. 5 ( It narrows gradually toward the upper side in a).

More specifically, in this modification, the length along the axial direction AD of the cutout portion 70 (depth) _{L B} is 6 mm, the circumferential direction CD in along the length (width) _{W B} is 5.5 mm, the proximal end the inner peripheral surface of curvature radius R _B of the arcuate portion becomes a 3mm located. Then, when the sleeve printing plate 30 is enlarged, when the length W _B of the circumferential direction CD deformed cutout portion 70 is extended to 5.9 mm, the pin member 60 into the notches 70 Can be inserted and the notch 70 and the pin member 60 are engaged as shown in FIG. 5B.

In the engaged state of the notch 70 and the pin member 60 shown in FIG. 5B, the contact area F between the inner periphery of the notch 70 and the outer periphery of the pin member 60 is the inside of the notch 70. Over the entire lap.
In addition, the shape of the pin member 60 in this modification is as described above in the present embodiment.

According to the modification shown in FIG. 5, the following effects are obtained.
That is, since the notch portion 70 opens at the end portion (back end portion) along the axial direction AD of the sleeve printing plate 30, when the diameter of the sleeve printing plate 30 is expanded, the notch portion In 70, the deformation amount at the end side portion (the opening portion on the back side) of the sleeve printing plate 30 along the axial direction AD is the center side portion (front side portion) of the sleeve printing plate 30 along the axial direction AD. It tends to be larger than the amount of deformation.
Therefore, with the above construction, when the sleeve printing plate 30 is expanded, can the length W _B of the circumferential direction CD of the cutout portion 70 so as to be uniform over the entire axial length AD, thereby In addition, the contact area F between the notch 70 and the pin member 60 can be increased, and the engagement state thereof is further ensured and stable.

In the modification of FIG. 6, as shown in FIG. 6 (a), the length W _B of the circumferential direction CD of the undeformed notches 70 of the notched portion 70, along the axial direction AD Compared with the central side portion of the sleeve printing plate 30 (the end portion on the near side of the notch portion 70 in the illustrated example, the lower end portion of the notch portion 70 in FIG. 6A), the end side portion (notch portion). The rear side portion of 70 (a portion other than the end portion on the near side and a portion in which the pair of side portions 71 along the axial direction AD is arranged in the cutout portion 70), the cutout portion 70 in FIG. The upper part is made smaller.

6A, the notched portion 70 before deformation extends along the axial direction AD and is opposed to each other in parallel with a distance in the circumferential direction CD so as to form a pair of straight lines. Side portions 71 are formed. The pair of side portions 71 corresponds to the end portion side portion of the sleeve printing plate 30 along the axial direction AD (in the illustrated example, the portion other than the lower end portion of the notch portion 70) of the inner periphery of the notch portion 70. Is formed. (Corresponding to the width W _B) distance along the circumferential direction CD between the pair of side portions 71 is constant over the entire region along the axial direction AD of side portions 71. The distance between the pair of side portions 71 of the notches 70 is smaller than the length W _A of the circumferential direction CD of the pin member 60.

In this modified example, the front side end portion (front side portion) of the notch portion 70 is formed in an oblong hole shape long in the circumferential direction CD, and the portion other than the front side end portion (back side portion) is It has a rectangular hole shape, and the length in the circumferential direction CD at the end portion on the near side is made larger than the length in the circumferential direction CD at a portion other than the end portion on the near side.
Specifically, the length along the axial direction AD of the notch 70 (depth) _{L B} 6 mm, length along the circumferential direction CD is (width) _{W B} 5.6 mm, located at the end of the front side in oblong hole, the radius of curvature R _B of the inner peripheral surface of the arcuate portion formed at both end portions in the circumferential direction CD has become 1 mm.

According to the modification shown in FIG. 6, the same effect as the above-described sleeve printing plate alignment structure 50 shown in FIGS. 4 and 5 can be obtained.
Further, in the modified example of FIG. 6, when the diameter of the sleeve printing plate 30 is expanded, the front end of the notch 70 is more actively deformed in the circumferential direction CD than in the examples of FIGS. Thus, the difference between the deformation amount in the opening portion on the back side of the cutout portion 70 and the deformation amount in the near side portion can be reduced. Therefore, according to this modified example, as shown in FIG. 6B, the pair of side portions 71 of the notch portion 70 and the pair of wall portions 61 of the pin member 60 include the side portion 71 and the wall portion. It becomes easy to contact | abut each other over the whole region along 61 axial direction AD, and the effect mentioned above becomes much more remarkable.

Further, in the modification of FIG. 7, the notch 70 is substantially rectangular in a front view of the notch 70 shown in FIG. 7A before the sleeve printing plate 30 is expanded in diameter by elastic deformation (before deformation). Specifically, when viewed from the front, the front end of the notch 70 along the axial direction AD is a semicircular hole, and the other part is a rectangular hole. ing.
In addition, a pair of side portions 71 that extend along the axial direction AD and that are opposed to each other in parallel in the circumferential direction CD are formed on the inner periphery of the cutout portion 70 to form a straight line. An arcuate portion that connects the side portions 71 (an end portion on the near side of the inner periphery of the cutout portion 70) is formed.

In this modified example, as shown in FIG. 7B, the distance along the circumferential direction CD between the pair of wall portions 61 disposed in the circumferential direction CD in the pin member 60 is the distance of the pin member 60. Among these, compared to the central side portion of the cylinder 6 along the axial direction AD (the front side portion of the pin member 60, the lower side portion of the pin member 60 in FIG. 7B), the end side portion (the back side of the pin member 60). The side portion is enlarged at the upper portion of the pin member 60 in FIG.
Specifically, in the outer periphery of the pin member 60, the distance between the pair of wall portions 61 that are arranged to face each other in the circumferential direction CD is from the front side of the pin member 60 to the back side (upper side in FIG. 7B). It is gradually expanded as it goes.

More specifically, in this modification, the length along the axial direction AD of the cutout portion 70 (depth) _{L B} is 6 mm, the circumferential length along the direction CD (width) _{W B} is 6 mm, at an end of the front side the radius of curvature R _B of the inner peripheral surface of the arcuate portion is in the 3 mm. Moreover, semi-cylindrical portion length along the axial direction AD of the pin member 60 (depth) _{L A} is 6 mm, the along the length circumferential direction CD (width) _{W A} is 6.8 mm, located at the end of the front side The radius of curvature R _A of the outer peripheral surface is 3 mm. Then, when the sleeve printing plate 30 is enlarged, when the length W _B of the circumferential direction CD deformed cutout portion 70 is extended to 6.8 mm, the pin member 60 into the notches 70 And the notch 70 and the pin member 60 are closely engaged with each other without a gap.
Although not particularly illustrated, in this modified example, in the engaged state of the notch portion 70 and the pin member 60, the contact area F between the inner periphery of the notch portion 70 and the outer periphery of the pin member 60 is the notch portion. It covers the entire inner circumference of 70.

According to the modification shown in FIG. 7, the same effects as those of the above-described embodiment and modification can be obtained.
Furthermore, in this modified example, when the sleeve printing plate 30 is fitted to the outer periphery of the cylinder 6, the pair of wall portions facing the both sides of the circumferential direction CD (that is, arranged back in the circumferential direction CD) in the pin member 60. The pair of side portions 71 of the cutout portion 70 is deformed so as to correspond to the shape of the 61 (that is, the pair of side portions 71 are not parallel to each other), and the pair of wall portions 61 and the pair of side portions 71. Is reliably brought into contact with a wider range. Therefore, the above-described effect can be obtained stably.
Specifically, since the pair of side parts 71 of the notch part 70 and the pair of wall parts 61 of the pin member 60 extend inclining with respect to the axial direction AD and are brought into contact with each other, Compared to the modified example of FIG. 5, a larger contact area F can be secured.

  The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

  For example, in the above-described embodiment, when the sleeve printing plate 30 is mounted on the outer periphery of the cylinder 6, the notch 70 contacts the pin member 60 from the circumferential direction CD and also from the axial direction AD. However, the present invention is not limited to this. That is, the relative movement in the axial direction AD between the sleeve printing plate 30 and the cylinder 6 may be restricted regardless of the engagement between the notch portion 70 and the pin member 60. However, as in the above-described embodiment, the relative movement in the axial direction AD between the sleeve printing plate 30 and the cylinder 6 is also regulated by the contact (engagement) between the notch portion 70 and the pin member 60. The printing accuracy can be improved with a simple structure, which is more preferable.

  Further, in the above-described embodiment, one pin member 60 protrudes from the back end of the outer periphery of the cylinder 6, and one notch 70 is formed at the back end of the sleeve printing plate 30. However, a plurality of sets of the pin member 60 and the notch 70 that are engaged with each other may be provided.

  In the above-described embodiment, the front end of the pin member 60 has a semicircular column shape with a semicircular cross section. However, the present invention is not limited to this. That is, the front end of the pin member 60 may be, for example, a polygonal column having a polygonal cross section or a semielliptical column having a semielliptical cross section.

In the above-described embodiment, the plate material 32 including the relief plate 40 has been described as being integrally formed with the sleeve support 31. However, the present invention is not limited to this. The body 31 may be detachably disposed. In other words, the sleeve printing plate 30 may be such that the outer peripheral surface of the sleeve support 31 is mounted (laminated) with a plate material 32 separate from the sleeve support 31.
Further, the material and dimensions of the sleeve support 31 and the plate member 32, the number and arrangement of the plate members 32 provided on the sleeve support 31, and the like are not limited to those described in the above embodiment.

  In addition, in the range which does not deviate from the meaning of this invention, you may combine each structure (component) demonstrated by the above-mentioned embodiment, a modified example, a note, etc., addition of a structure, omission, substitution, others It can be changed. Further, the present invention is not limited by the above-described embodiments, and is limited only by the scope of the claims.

  Hereinafter, the present invention will be specifically described by way of examples. However, the present invention is not limited to this embodiment.

[Registration confirmation test]
As Examples 1 to 3 of the present invention, the cylinder 6 and the sleeve printing plate 30 employing the sleeve printing plate alignment structure 50 described in the above embodiment were prepared.
Specifically, as Example 1, one set (two) of sleeve printing plates 30 of the sleeve printing plate alignment structure 50 shown in FIG. 5 is prepared. As Example 2, sleeve printing shown in FIG. One set of the sleeve printing plate 30 of the plate alignment structure 50 was prepared. As Example 3, one set of the sleeve printing plate 30 of the sleeve printing plate alignment structure 50 shown in FIG. 6 was prepared. In addition, only the first mark 81 of the substantially cross-shaped misregistration measurement mark 80 shown in FIG. 9 is laser engraved on the relief plate 40 of one sleeve printing plate 30 of each set of sleeve printing plates 30; Only the second mark 82 of the misregistration amount measurement mark 80 was laser engraved on the relief plate 40 of the other sleeve printing plate 30.

  And using these relief plates 40, printing is performed on the outer peripheral surface (can body) of the same can 20, and the first and second marks 81, 82 of the misalignment measurement marks 80 in the can 20 after printing are between each other. The amount of displacement was confirmed for each of the circumferential direction CD and the axial direction AD. This confirmation operation was repeated five times by removing the sleeve printing plate 30 from the cylinder 6 and mounting it again, and the measurement result was the value of which the amount of positional deviation was maximum.

On the other hand, as a conventional comparative example, a cylinder and a sleeve printing plate employing the sleeve printing plate alignment structure 100 shown in FIG. 8 were prepared. Also for the comparative example, the confirmation operation was performed in the same manner as in Examples 1 to 3.
The results are shown in Table 1.

[Evaluation]
As shown in Table 1, in Examples 1 to 3 of the present invention, both the positional deviation amount in the circumferential direction CD and the positional deviation amount in the axial direction AD are 0.1 mm or less, and sufficient registration accuracy is ensured. In addition, it was confirmed that the printing accuracy can be improved. In particular, in Examples 1 and 3, the positional deviation amount in the circumferential direction CD was both 0.01 mm or less, and a particularly remarkable effect was obtained.
On the other hand, in the comparative example, the positional deviation amount in the circumferential direction CD was 0.7 mm, and the printing accuracy could not be ensured.

6 Cylinder 30 Sleeve printing plate 50 Sleeve printing plate alignment structure 60 Pin member 61 Wall portion 70 Notch portion 71 Side portion AD Axial direction (axial direction)
CD circumferential direction O axis W length (width) along the circumferential direction of the _A pin member
W _B cutout of along the circumferential length (width)

Claims (5)

A sleeve printing plate alignment structure for aligning the sleeve printing plate with respect to the cylinder when a cylindrical sleeve printing plate is mounted on the outer periphery of the cylinder,
The sleeve printing plate is formed with a notch at the end in the axial direction thereof,
On the outer periphery of the cylinder, a pin member to be inserted into the notch is projected,
The circumferential length along the axis of the notch is smaller than the circumferential length of the pin member,
When the sleeve printing plate is fitted to the outer periphery of the cylinder while being expanded in diameter by elastic deformation, the circumferential length of the deformed notch is the circumferential length of the pin member. A sleeve printing plate alignment structure characterized by having a corresponding size. The sleeve printing plate alignment structure according to claim 1,
The sleeve printing plate alignment structure according to claim 1, wherein when the sleeve printing plate is mounted on an outer periphery of the cylinder, the notch is in contact with the pin member from the axial direction. The sleeve printing plate alignment structure according to claim 1 or 2,
The notched portion before the deformation is formed with a pair of side portions that extend along the axial direction and are arranged to face each other in parallel with a gap in the circumferential direction. The sleeve printing plate alignment structure, wherein a distance between the side portions of the sleeve is smaller than a length of the pin member in the circumferential direction. It is the alignment structure of the sleeve printing plate as described in any one of Claims 1-3,
The length in the circumferential direction of the notch before deformation is made smaller in the end portion than in the center portion of the sleeve printing plate along the axial direction in the notch. The sleeve printing plate alignment structure characterized by the above. An alignment structure for a sleeve printing plate according to claim 3,
The pin member is formed with a pair of wall portions disposed in the circumferential direction, and a distance along the circumferential direction between the pair of wall portions is the axial direction of the pin member along the axial direction. A sleeve printing plate alignment structure characterized in that it is made larger at the end side portion than at the center side portion of the cylinder.

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