JP5677019B2 - Method for fixing sleeve printing plate, plate cylinder for sleeve printing plate and printing apparatus for can - Google Patents

Description

  The present invention relates to a sleeve printing plate fixing method for fixing a cylindrical sleeve printing plate to a sleeve printing plate cylinder provided in a printing apparatus, the sleeve printing plate cylinder, and the sleeve printing plate cylinder The present invention relates to a printing apparatus for a can.

A sleeve printing plate is usually formed of a fiber reinforced plastic (FRP) sleeve support and an outer peripheral surface of the sleeve support, and is formed of a photosensitive resin that can be engraved with laser light, for example, to form an image pattern. And the plate body.
Such a sleeve printing plate is widely used in the fields of flexographic printing and letterpress printing, as described in Patent Document 1, for example. Further, as described in Patent Document 2, this sleeve printing plate is also applied in the field of offset printing for cylindrical objects such as cans.

  In this sleeve printing plate, it is used by being mounted on the cylindrical surface of the plate cylinder of the printing apparatus, but since the circumferential position of the image pattern is preset on the sleeve support, the sleeve support, the plate cylinder, By performing the above-mentioned alignment, it is possible to register the image pattern, and it is possible to greatly reduce the time and labor required for the image pattern exchange work.

  Here, in the sleeve printing plate, the inner diameter is slightly smaller than the outer diameter of the plate cylinder, and the sleeve printing plate is formed by ejecting air from an air hole provided in the cylindrical surface of the plate cylinder. Is expanded and is fitted to the cylindrical surface of the plate cylinder. In other words, the sleeve printing plate and the plate cylinder are strengthened by the frictional force generated between the inner surface of the sleeve printing plate and the outer surface of the plate cylinder caused by the contraction force that the expanded sleeve printing plate tries to restore to the original inner diameter. It is fixed to.

Further, in the above-described sleeve printing plate, it is necessary to fix the axial position and the circumferential position of the sleeve printing plate and the plate cylinder.
Therefore, in Patent Document 3, a sleeve printing plate is formed by forming a positioning convex portion on the sleeve printing plate and forming a positioning member on the plate cylinder, and engaging the positioning convex portion with the positioning member. A technique is disclosed in which the relative position in the circumferential direction and the relative position in the axial direction between the plate cylinder and the plate cylinder are determined.

  Further, as shown in Patent Document 4, a notch portion opened toward the end in the axial direction is provided in a part of the sleeve printing plate, a guide pin is provided in the plate cylinder, and the notch portion is engaged with the guide pin. Thus, there is also provided a technique for determining the relative position in the circumferential direction and the relative position in the axial direction between the sleeve printing plate and the plate cylinder.

JP 2006-326938 A JP 2006-272682 A JP 2007-044987 A JP 2010-137505 A

Incidentally, when the sleeve printing plate is actually used for printing, torque may be transmitted between the sleeve printing plate and the plate cylinder. That is, there may be a force that shifts the sleeve printing plate from the plate cylinder in the rotation direction.
If this torque is small, the frictional force between the inner surface of the sleeve printing plate and the outer surface of the plate cylinder can withstand the force shifted in the rotational direction. However, when the printing speed is increased or the printing pressure is increased in order to improve the printing quality, the torque becomes excessive, and the sleeve printing plate cannot be fixed only by the frictional force and starts to slide.

  When positioning the sleeve printing plate and the plate cylinder using the guide pins as described above, if the torque is excessive and the sleeve printing plate slips, the rotational torque is transferred via the guide pins of the plate cylinder. By pressing the notch portion of the sleeve printing plate, it is transmitted to the sleeve printing plate. Then, an excessive load is applied to the notch, and the notch may be plastically deformed at an early stage. When the notch is plastically deformed, the sleeve printing plate cannot be accurately positioned, and the printing quality is deteriorated. Then, even if the sleeve main body of the sleeve printing plate is healthy, the sleeve printing plate is discarded, and there is a problem that the service life of the sleeve printing plate is significantly shortened.

  Here, in patent document 4, in order to suppress the plastic deformation of a notch part, the technique which reinforces a notch part is disclosed. However, since torque is transmitted using the notch for positioning, the positioning accuracy may be deteriorated, which is not preferable. There is also a problem that the manufacturing cost of the sleeve printing plate increases.

  The present invention has been made in consideration of such circumstances, and its purpose is to firmly fix the sleeve printing plate to prevent the occurrence of misalignment during printing, and to perform the printing operation stably. It is an object of the present invention to provide a method for fixing a sleeve printing plate, a printing cylinder for a sleeve printing plate, and a printing apparatus for a can including the printing plate cylinder for a sleeve printing plate.

In order to achieve the above object, the present invention employs the following means. That is, the sleeve printing plate fixing method of the present invention is a method for fixing a sleeve printing plate in which a cylindrical sleeve printing plate extending along an axis is fixed to a sleeve printing plate cylinder provided in a printing apparatus. The sleeve printing plate is formed with an image portion on which an image pattern used for printing is disposed, and an extending portion extending from the image portion to at least one side in the axial direction. In the sleeve printing plate cylinder, a fixing member that presses the sleeve printing plate from the outer peripheral surface side is provided on at least one of the end portions in the axial direction, and the extending portion is sandwiched by the fixing member. by the which the sleeve printing plate is configured to be secured to the sleeve printing plate plate cylinder, wherein the fixing member includes a body portion which is mounted on an end face of the sleeve printing plate plate cylinder, the body Equipped with a locking portion for locking the outer peripheral surface of the sleeve printing plate end extends from, and is characterized in that the locking portion has a plurality of circumferentially disposed.

According to the fixing method of the sleeve printing plate having such a configuration, the sleeve printing plate is firmly fixed, and the occurrence of misalignment during printing is prevented. Therefore, the printing operation can be performed stably.
Further, since the rotational torque is transmitted to the sleeve printing plate by the fixing member, an excessive load does not act on the notch portion of the sleeve printing plate, etc., so that deformation of the notch portion of the sleeve printing plate is suppressed, Early deterioration of the sleeve printing plate is suppressed, and printing with high registration accuracy is possible.
Furthermore, since the extending portion extending from the image portion toward at least one side in the axial direction is sandwiched by the fixing member, the image portion used for printing is not deformed, and the printing operation can be performed stably. it can.

Here, it is preferable that the fixing member is retracted radially inward from a plate body provided in an image portion of the sleeve printing plate in a state where the sleeve printing plate is mounted.
In this case, since the fixing member is retracted radially inward from the plate body, the fixing member is prevented from interfering with peripheral members of the sleeve printing plate cylinder during printing, and the printing operation is stably performed. be able to.

The sleeve printing plate cylinder of the present invention is a sleeve printing plate cylinder having a cylindrical surface extending along an axis, to which a sleeve printing plate having a cylindrical shape is detachably attached. At least one of the end portions in the axial direction is provided with a fixing member that presses and sandwiches the sleeve printing plate from the outer peripheral surface side toward the cylindrical surface, and the fixing member is the plate cylinder for the sleeve printing plate. A main body portion attached to the end surface of the sleeve, and a locking portion extending from the main body portion and locking to the outer peripheral surface of the end portion of the sleeve printing plate, and there are a plurality of the locking portions in the circumferential direction. It is characterized by being arranged .

  In the sleeve printing plate cylinder of the present invention configured as described above, the sleeve printing plate is fixed to at least one of the axial ends by pressing the sleeve printing plate from the outer peripheral surface side toward the cylindrical surface. Since the member is provided, the sleeve printing plate can be firmly fixed by the fixing member.

Further, the fixing member includes a main body portion attached to an end surface of the sleeve printing plate cylinder, a locking portion extending from the main body portion and locking to an outer peripheral surface of the sleeve printing plate end portion, It is preferable that a plurality of the locking portions are arranged in the circumferential direction.
In this case, since the end portion of the sleeve printing plate is sandwiched and fixed by a plurality of engaging portions arranged in the circumferential direction, a part of the sleeve printing plate in the circumferential direction is pressed. For this reason, the sleeve printing plate can be firmly fixed. In addition, it is preferable that the latching | locking part is arrange | positioned at equal intervals in the circumferential direction. In this case, the rotational torque acts evenly in the circumferential direction of the sleeve printing plate, so that deformation of the sleeve printing plate can be suppressed, and displacement of the sleeve printing plate during printing can be more reliably prevented. Can do.

The printing apparatus for a can of the present invention is a printing apparatus for a can that prints an image pattern formed on the outer peripheral surface of a cylindrical sleeve printing plate on a can body, and the sleeve printing plate is the sleeve printing plate described above. It is characterized by being mounted on the plate cylinder.
According to the printing apparatus for a can having such a configuration, the sleeve printing plate and the plate cylinder are firmly fixed, the positional deviation during printing of the sleeve printing plate is prevented, and a stable printing operation is performed. Can do.

  According to the present invention, the sleeve printing plate can be firmly fixed to prevent the occurrence of misalignment during printing, and the printing method can be stably performed. In addition, it is possible to provide a printing apparatus for a can having the sleeve printing plate cylinder.

BRIEF DESCRIPTION OF THE DRAWINGS FIG . 1 is a perspective explanatory view illustrating a sleeve printing plate cylinder and a sleeve printing plate according to a first embodiment of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG . 1 is a cross-sectional explanatory view showing a state where a sleeve printing plate is mounted on a sleeve printing plate cylinder which is a first embodiment of the present invention. It is a schematic explanatory drawing of the printing apparatus of the can which is 1st reference embodiment of this invention. FIG. 4 is a partially enlarged explanatory view of the can printing apparatus shown in FIG. 3. FIG. 5 is a front view of FIG. 4. It is explanatory drawing which shows the state with which the sleeve printing plate was mounted | worn to the plate cylinder for sleeve printing plates which is 2nd reference embodiment of this invention. FIG. 7 is a cross-sectional view along the axis L of the sleeve printing plate and the sleeve printing plate shown in FIG. 6. It is explanatory drawing which shows the state with which the sleeve printing plate was mounted | worn with the plate cylinder for sleeve printing plates which is embodiment of this invention . FIG. 9 is a cross-sectional view taken along an axis L of the sleeve printing plate and the sleeve printing plate shown in FIG. 8.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
First, the sleeve printing plate 30 used in this embodiment and the plate cylinder 60 which is the first reference embodiment will be described.
As shown in FIG. 1, the sleeve printing plate 30 has a cylindrical sleeve support 31 extending along the axis L, and is disposed on the outer peripheral surface of the sleeve support 31. And a formed plate main body 33.

The sleeve support 31 is made of fiber reinforced plastic (FRP) or polyethylene terephthalate (PET) resin.
The plate body 33 is formed by forming an image pattern by etching or laser processing on a plate material made of a photosensitive resin that can be engraved with laser light, for example, and is a so-called relief plate.
In the present embodiment, the two plate bodies 33 are disposed at positions facing each other across the axis L.
Further, on the rear end side (right side in FIG. 1) of the sleeve printing plate 30 in the axis L direction, it engages with a guide pin 66 of the plate cylinder 60 which will be described later. A guide cutout 34 for guiding the position is formed.

  As shown in FIG. 1, the sleeve printing plate 30 has an image portion T1 on which an image pattern of the plate body 33 is formed, and an extending portion extending from the image portion T1 toward both ends in the axis L direction. T2 and T2 are provided. That is, the plate main body 33 is disposed so as to be positioned at the central portion in the axis L direction of the sleeve support 31.

Next, the plate cylinder 60 will be described. As shown in FIG. 1, the plate cylinder 60 has a cylindrical shape, and includes an inner peripheral hole 61, a cylindrical surface 62 facing the outer peripheral side, and an end surface 63 in the axis L direction.
The plate cylinder 60 has an air supply path 64 that opens to one end face 63 in the axis L direction and extends along the axis L, and an air hole 65 that communicates with the air supply path 64 and opens to the cylindrical surface 62. The sleeve printing plate 30 is enlarged in diameter by the air blown out from the air holes 65 and is attached and detached.

  A distal end of a drive shaft 71 that rotationally drives the plate cylinder 60 is detachably inserted into the inner peripheral hole 61. In this embodiment, the inner peripheral hole 61 is a tapered hole that gradually decreases in diameter toward the tip end side in the axis L direction (left side in FIG. 1), and the tip of the drive shaft 71 is also the tip end side in the axis L direction (in FIG. 1). The taper shaft gradually decreases in diameter toward the left side. Here, as described above, the inner peripheral hole 61 and the drive shaft 71 are taper-fitted, and the relative position in the axis L direction is determined.

  On the cylindrical surface 62, a guide pin for guiding a circumferential relative position and a relative position in the axial L direction with respect to the sleeve printing plate 30 including the plate main bodies 33 and 33 on the rear end side in the axial L direction (right side in FIG. 1). 66 protrudes.

An annular groove 67 is disposed on the rear end side of the plate cylinder 60 in the axis L direction. As shown in FIG. 2, the annular groove 67 extends from the end surface on the rear end side in the axis L direction of the plate cylinder 60 toward the outer side in the radial direction, and protrudes toward the front end side in the axis L direction. And a part of the cylindrical surface 62.
Here, as shown in FIG. 2, the groove width of the annular groove portion 67 gradually decreases toward the rear end side in the axis L direction. Further, the outer surface support portion 68 is retracted radially inward from the plate body 33 provided in the image portion T1 of the sleeve printing plate 30.

Next, a method for mounting the sleeve printing plate 30 on the plate cylinder 60 will be described.
First, one end of the sleeve printing plate 30 is fitted into the outer peripheral surface of the plate cylinder 60. In this state, an air pump or the like is connected to an air supply path 64 opened on one end face 63 in the axis L direction of the plate cylinder 60 to supply air. The supplied air is ejected from an air hole 65 opened in the cylindrical surface 62 through an air supply path 64 extending parallel to the axis L. The sleeve printing plate 30 is expanded in diameter by the air thus ejected, and the sleeve printing plate 30 is mounted on the plate cylinder 60.

At this time, the guide notch 34 provided on the rear end side in the axis L direction of the sleeve printing plate 30 is engaged with a guide pin 66 protruding from the rear end side in the axis L direction of the cylindrical surface 62 of the plate cylinder 60. The circumferential relative position between the sleeve printing plate 30 and the plate cylinder 60 and the relative position in the axis L direction are determined.
Here, the rear end portion in the axis L direction of the sleeve printing plate 30 is inserted into the annular groove portion 67 described above. Since the groove width of the annular groove portion 67 is gradually narrowed toward the rear end side in the direction of the axis L, the outer surface of the sleeve printing plate 30 defining the annular groove portion 67 is inserted by inserting the sleeve printing plate 30. It will be pressed to the cylindrical surface 62 side by the support part 68, and will be clamped by these outer surface support parts 68 and the cylindrical surface 62, and will be fixed.

  That is, of the extending portions T2 and T2 formed on both ends of the image portion T1 in which the plate body 33 is disposed in the axis L direction, a part of the extending portion T2 on the rear end side in the axis L direction is an annular groove portion 67. The sleeve printing plate 30 is fixed to the plate cylinder 60.

Next, a can printing apparatus A according to this embodiment using the above-described sleeve printing plate 30 and plate cylinder 60 will be described. An outline of the printing apparatus A for cans is shown in FIGS.
A printing apparatus A for a can according to the present embodiment is schematically constituted by a plurality of ink adhesion mechanisms B and can movement mechanisms C.

  The ink adhering mechanism B includes an inker unit 1 that supplies ink, and a blanket 9 that contacts the outer surface of the can body 20 and prints (adheres) the ink after contacting the inker unit 1 and copying the ink. And a blanket wheel 8 having a plurality of blankets 9.

  The can moving mechanism C sequentially includes a can shooter 10 for taking in the can body 20, a mandrel 11 for rotatably holding the can body 20 supplied from the can shooter 10, and a can body 20 mounted on the mandrel 11. , And a mandrel turret 12 that rotates in the direction of the ink adhesion mechanism B.

  As shown in FIG. 3, the inker unit 1 includes an ink source 2, a ducting roll 3 that comes into contact with the ink source 2 and receives ink, and an intermediate roll that kneads the ink attached in contact with the ducting roll 3. 4 and an ink adhering roll 5 in contact with the intermediate roll 4, and a plate cylinder 60 in contact with the ink adhering roll 5, and transferred to the can cylinder 20 on the outer peripheral surface (cylindrical surface 62) of the plate cylinder 60. A sleeve printing plate 30 having a plate body 33 having an image pattern to be printed is disposed.

  A plurality of blankets 9 are provided on the outer peripheral surface of the blanket wheel 8, and the blanket 9 is in contact with the plate body 33 of the sleeve printing plate 30 disposed on the outer peripheral surface of the plate cylinder 60, and the can cylinder. 20.

Here, as shown in FIG. 4, the outer peripheral surface of the ink adhering roll 5 and the plate main body 33 of the sleeve printing plate 30 mounted on the plate cylinder 60 are in contact with each other. Ink is attached to 33.
The plate main body 33 is configured to come into contact with the blanket 9 provided in the blanket wheel 8, and the ink attached to the plate main body 33 is transferred to the blanket 9.

  In this embodiment, as shown in FIG. 5, the length of the plate cylinder 60 and the sleeve printing plate 30 in the axis L direction is set to be longer than the length of the ink adhering roll 5 in the axis L ′ direction. The roll 5 is located at the center of the plate cylinder 60 in the axis L direction. That is, the ink adhering roll 5 is disposed so as to face the image portion T1 of the sleeve printing plate 30 mounted on the plate cylinder 60.

  In the printing apparatus A of the can configured as described above, inks of different colors from the ink source 2 of each inker unit 1 pass through the ducting roll 3, the intermediate roll 4, and the ink adhesion roll 5, respectively. The ink is attached to a plate main body 33 disposed on the outer peripheral surface (cylindrical surface 62) of the plate cylinder 60, and the inks of these colors are placed on the blanket 9 on the rotating blanket wheel 8 as a pattern. The printing is performed while being in contact with the can body 20 held on the surface.

According to the present embodiment configured as described above, one end of the sleeve printing plate 30 is inserted into the annular groove portion 67, and the sleeve printing plate 30 is firmly fixed by the annular groove portion 67. Occurrence of misalignment is prevented, and printing can be performed stably.
Further, since the rotational torque is transmitted to the sleeve printing plate 30 via the annular groove portion 67, an excessive load does not act on the guide notch portion 34 of the sleeve printing plate 30. Therefore, early deterioration of the sleeve printing plate 30 is suppressed, and printing with high registration accuracy is possible.
Furthermore, since the extending portion T2 extending from the image portion T1 in which the plate main body 33 is disposed in the sleeve printing plate 30 toward the rear end side in the axis L direction is inserted into the annular groove portion 67, it is used for printing. The image portion T1 to be printed is not deformed, and the printing operation can be performed stably.

  Further, since the outer surface support portion 68 that defines the annular groove portion 67 is retracted radially inward from the plate body 33 provided in the image portion T1 of the sleeve printing plate 30, the outer surface support portion 68 is attached to the ink. The printing operation can be performed stably without interfering with the roll 5. Further, ink can be adhered only from the ink adhesion roll 5 to the image portion T1, and high-quality printing can be performed.

  Furthermore, in the present embodiment, the groove width of the annular groove portion 67 is configured so as to gradually become narrower toward the rear end side in the axis L direction. Therefore, by further increasing the insertion depth of the sleeve printing plate 30, The sleeve printing plate 30 can be firmly fixed.

  In addition, according to the printing apparatus A for a can according to the present embodiment, the sleeve printing plate 30 and the plate cylinder 60 are firmly fixed, so that the positional deviation during printing of the sleeve printing plate 30 is prevented, and printing is performed. Work can be performed stably.

Next, a plate cylinder 160 which is a second reference embodiment of the present invention will be described with reference to FIGS.
The plate cylinder 160 according to the present embodiment has a cylindrical shape and includes an inner peripheral hole 161 and a cylindrical surface 162 facing the outer peripheral side.
On the rear end side (right side in FIG. 7) in the axis L direction of the plate cylinder 160, as shown in FIG. As shown in FIG. 7, the annular groove portion 167 extends radially outward from the end surface on the rear end side in the axis L direction of the plate cylinder 160, and projects toward the front end side in the axis L direction (left side in FIG. 7). The outer surface support portion 168 and the cylindrical surface 162 are partly defined. Further, the annular groove portion 167 has a gradually narrowing groove width toward the rear end side in the axis L direction.

A ring-shaped member 180 that clamps the sleeve printing plate 30 from the outer peripheral surface side is disposed on the front end side in the axis L direction of the plate cylinder 160.
The ring-shaped member 180 is configured by joining two members having a semicircular arc shape with a bolt 182 at a flange portion 181. In addition, the pressing force with respect to the sleeve printing plate 30 is controlled by adjusting the tightening amount of the bolt 182.

Next, a method for mounting the sleeve printing plate 30 on the plate cylinder 160 will be described.
First, one end of the sleeve printing plate 30 is fitted into the outer peripheral surface of the plate cylinder 160. In this state, air is supplied by an air pump or the like from an air supply path 164 opened on one end face in the axis L direction of the plate cylinder 160. The supplied air is ejected from an air hole opening in the cylindrical surface 162 via an air supply path 164 extending in parallel with the axis L. The sleeve printing plate 30 is expanded in diameter by the air thus blown, and the sleeve printing plate 30 is mounted on the plate cylinder 160.

  Here, the end portion in the axis L direction of the sleeve printing plate 30 is inserted into the annular groove portion 167. Since the groove width of the annular groove portion 167 gradually becomes narrower toward the rear end side in the axis L direction, the outer surface support in which the sleeve printing plate 30 defines the annular groove portion 167 is inserted by inserting the sleeve printing plate 30. The portion 168 is pressed toward the cylindrical surface 162, and is sandwiched and fixed between the outer surface support portion 168 and the cylindrical surface 162.

Further, the ring-shaped member 180 is disposed in the extending portion T2 extending from the image portion T1 of the sleeve printing plate 30 toward the front end side in the axis L direction, and the bolt 182 of the flange portion 181 is tightened. Thereby, the sleeve printing plate 30 is pressed from the outer peripheral side by the ring-shaped member 180, and the sleeve printing plate 30 is fixed.
Here, the outer surface support portion 168 and the ring-shaped member 180 that define the annular groove portion 167 are retracted radially inward from the plate main body 33 provided in the image portion T1 of the sleeve printing plate 30.

According to the plate cylinder 160 of the present embodiment configured as described above, the sleeve printing plate 30 is inserted into the annular groove portion 167 as in the first embodiment, and the sleeve printing plate 30 is formed by the annular groove portion 167. Since it is firmly fixed, the occurrence of misalignment during printing is prevented, and the printing operation can be performed stably.
Furthermore, in this embodiment, since the ring-shaped member 180 is disposed on the front end side in the axis L direction of the plate cylinder 160, the extending portion T2 of the sleeve printing plate 30 can be tightened by the ring-shaped member 180. The sleeve printing plate 30 can be more firmly fixed.

Next, a plate cylinder 260 according to an embodiment of the present invention will be described with reference to FIGS.
The plate cylinder 260 according to the present embodiment has a cylindrical shape, and includes an inner peripheral hole 261 and a cylindrical surface 262 facing the outer peripheral side.
A fixing member 280 for fixing the sleeve printing plate 30 is detachably mounted on the end surface of the plate cylinder 260 facing the front end side in the axis L direction (left side in FIG. 9).

The fixing member 280 is attached to the end surface of the plate cylinder 260 facing the front end side in the axis L direction, and extends from the main body portion 281 outward in the radial direction. A locking portion 282 for locking.
The main body 281 is provided with an insertion shaft 283 that is inserted into an inner peripheral hole 261 that opens to the end surface of the plate cylinder 260 facing the front end side in the axis L direction.

A plurality of locking portions 282 are provided in the circumferential direction. In the present embodiment, as shown in FIG. 8, four locking portions 282 are provided in the circumferential direction. Further, these four locking portions 282 are arranged at equal intervals (90 ° intervals) in the circumferential direction.
As shown in FIGS. 8 and 9, the locking portion 282 is configured such that its radial position is adjusted by an adjustment bolt 284.

Next, a method for mounting the sleeve printing plate 30 on the plate cylinder 260 will be described.
First, one end of the sleeve printing plate 30 is fitted into the outer peripheral surface of the plate cylinder 260. In this state, air is supplied by an air pump or the like from an air supply path opened on one end face in the axis L direction of the plate cylinder 260. The supplied air is ejected from an air hole opened in the cylindrical surface 262 through an air supply path extending in parallel to the axis L. The sleeve printing plate 30 is expanded in diameter by the air thus ejected, and the sleeve printing plate 30 is mounted on the plate cylinder 260.

Here, the fixing member 280 is disposed on the front end side in the axis L direction of the plate cylinder 260, and the insertion shaft 283 of the main body 281 is inserted into the inner peripheral hole 261 of the plate cylinder 260 and fixed. At this time, the engaging portion 282 is disposed on the outer peripheral side of the extending portion T2 on the front end side in the axis L direction of the sleeve printing plate 30. Then, the locking portion 282 is moved inward in the radial direction by screwing the adjustment bolt 284, and the extending portion T2 of the sleeve printing plate 30 is pressed and fixed from the outer peripheral side.
Note that the locking portion 282 of the fixing member 280 is retracted radially inward from the plate body 33 provided in the image portion T1 of the sleeve printing plate 30.

  According to the plate cylinder 260 according to the present embodiment having such a configuration, the sleeve printing plate 30 is firmly fixed by pressing from the outer peripheral side with a plurality of engaging portions 282 arranged in the circumferential direction. Therefore, the occurrence of misalignment during printing is prevented, and the printing operation can be performed stably. In addition, since the extending portion T2 extending from the image portion T1 is pressed by the fixing member 280, the deformation of the image portion T1 can be prevented and high-quality printing can be performed.

Furthermore, in this embodiment, since the four locking portions 282 are arranged at equal intervals in the circumferential direction, the rotational torque acts evenly in the circumferential direction of the sleeve printing plate 30, and the sleeve printing plate 30. In addition, the displacement of the sleeve printing plate 30 during printing can be more reliably prevented.
Further, since the fixing member 280 includes the main body 281 attached to the end surface of the plate cylinder 260, the fixing member 280 can be used detachably, and there is no need to perform special processing on the cylindrical surface 262. The plate cylinder 260 can be manufactured at a low cost.

As mentioned above, although embodiment of this invention was described, this invention is not limited to this, It can change suitably in the range which does not deviate from the technical idea of the invention.
For example, although the description has been given using the sleeve printing plate in which two plate bodies are arranged, the present invention is not limited to this, and one plate body may be arranged, or three or more A plate body may be provided.

In the second reference embodiment , the ring-shaped member has been described as having two members. However, the present invention is not limited to this, and the sleeve printing plate may be fastened from the outer peripheral side. Good.
Furthermore, in the embodiment of the present invention, the description has been given assuming that four locking portions are provided. However, the present invention is not limited to this, and it is only necessary to have two or more locking portions.
In addition, the fixing member in the embodiment of the present invention may be combined with the annular groove portion and the ring-shaped member, or may be used alone.
Further, the sleeve printing plate has been described as having the image portion T1 and the extending portions T2 and T2 extending from the image portion T1 to both ends in the axis L direction. However, the present invention is not limited to this. The extending portion T2 may be provided only on one side in the direction of the axis L of the portion.

A comparative experiment conducted to confirm the effectiveness of the present invention will be described.
A sleeve printing plate having an inner diameter of 225.5 mm is mounted on a plate cylinder having an outer diameter of 226 mm and the length in the axis L direction is 187 mm, and the rotational torque value at which the sleeve printing plate starts moving along the cylindrical surface is measured. did.
In the sleeve printing plate, the sleeve support is made of FRP, the plate material is made of a photosensitive resin, the thickness t1 of the sleeve support is 0.7 mm, and the thickness t2 of the plate material is 0. .6 mm was used.

As a conventional example, a plate cylinder having no fixing member was used.
In Reference Example 1 , as shown in the first reference embodiment , a plate cylinder provided with an annular groove on the rear end side in the axis L direction was used. In addition, the depth (length in the axis L direction) of the annular groove was 10 mm, the groove width (diameter length) of the opening of the annular groove was 2 mm, and the groove width of the bottom of the annular groove was 0.6 mm.

The reference example 2 used what was provided with the annular groove part and the ring-shaped member as shown in 2nd reference embodiment . The shape and dimensions of the annular groove were the same as in Example 1 of the present invention. The ring-shaped member had a width (length in the direction of the axis L) of 10 mm and an inner diameter of 227 mm.

In Example 3 of the present invention, as shown in the embodiment of the present invention , a plate cylinder provided with a fixing member on the front end side in the axis L direction was used. Here, the pressing depth of the sleeve printing plate by the locking portion was set to 0.5 mm.
Example 4 of the present invention uses the fixing members used in Example 3 of the present invention disposed on the front end side and the rear end side of the plate cylinder in the direction of the axis L, where the sleeve printing plate is pressed by the locking portion. The depth was 0.5 mm.

According to Table 1, it was confirmed that Examples 3 and 4 of the present invention have a higher torque at which the sleeve printing plate starts to rotate and can be firmly fixed compared to the conventional example.
Therefore, according to the present invention, it is possible to prevent the positional deviation during printing of the sleeve printing plate, and it is possible to perform the printing operation stably.

30 Sleeve printing plate 33 Plate body 60, 160, 260 Plate cylinder (plate cylinder for sleeve printing plate)
62, 162, 262 Cylindrical surface 67, 167 Annular groove (fixing member)
180 Ring-shaped member (fixing member)
280 Fixing member 281 Main body 282 Locking part A Can printing apparatus T1 Image part T2 Extension part

Claims (4)

A sleeve printing plate fixing method for fixing a sleeve printing plate having a cylindrical shape extending along an axis to a sleeve cylinder for a sleeve printing plate provided in a printing apparatus,
The sleeve printing plate is formed with an image portion provided with an image pattern used for printing, and an extending portion extending from the image portion to at least one side in the axial direction,
The sleeve printing plate cylinder is provided with a fixing member that presses the sleeve printing plate from the outer peripheral surface side at least one of the axial ends.
The sleeve printing plate is fixed to the sleeve printing plate cylinder by sandwiching the extending portion with the fixing member ,
The fixing member includes a main body attached to an end surface of the sleeve printing plate cylinder, and a locking portion extending from the main body and engaging with an outer peripheral surface of the sleeve printing plate end. A method for fixing a sleeve printing plate , wherein a plurality of the engaging portions are arranged in the circumferential direction .   2. The fixing member according to claim 1, wherein the fixing member is retracted radially inward from a plate body provided in an image portion of the sleeve printing plate in a state where the sleeve printing plate is mounted. How to fix the sleeve printing plate. A sleeve printing plate cylinder having a cylindrical surface extending along an axis, and a sleeve printing plate having a cylindrical shape detachably attached to the cylindrical surface,
At least one of the end portions in the axial direction is provided with a fixing member that presses and holds the sleeve printing plate from the outer peripheral surface side toward the cylindrical surface ,
The fixing member includes a main body attached to an end surface of the sleeve printing plate cylinder, and a locking portion extending from the main body and engaging with an outer peripheral surface of the sleeve printing plate end. And a plurality of the engaging portions are arranged in the circumferential direction . A printing apparatus for a can that prints an image pattern formed on an outer peripheral surface of a cylindrical sleeve printing plate on a can body,
A printing apparatus for a can, wherein the sleeve printing plate is mounted on the plate cylinder for sleeve printing plate according to claim 3 .

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