JP5485206B2 - Can printing device and sleeve - Google Patents

Description

The present invention relates to a can printing apparatus and a sleeve for printing on a can body such as a two-piece can.

  A two-piece can used as a container for soft drinks, etc. consists of a can lid and a cylindrical can body, and the can body is printed on the outer surface after DI (deep drawing, ironing) processing and washing. Is given. In printing the can body, a printing apparatus having an offset printing mechanism as shown in Patent Document 1 and Patent Document 2 is used. FIG. 6 shows an example of a printing apparatus for cans. The printing apparatus A for cans is schematically configured by a plurality of ink adhering mechanisms B and can moving mechanisms C. (See Patent Document 1 and Patent Document 2)

The ink adhesion mechanism B includes an inker unit 1 that supplies ink, and a blanket wheel that contacts the outer surface of the can body 20 and prints (deposits) the ink after contacting the inker unit 1 and copying the ink. 8.
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 that is connected to the ducting roll 3 and includes a plurality of rollers, and the intermediate roller 4 A rubber roller 5 to be connected and a plate cylinder 6 to be connected to the rubber roller 5 are formed. On the outer peripheral surface of the plate cylinder 6, a plate 7 formed in the same shape as a pattern to be transferred to the can body 20 is formed. The plate cylinder 6 is rotatably supported by the shaft portion of the printing apparatus A.
A plurality of blankets 9 are provided on the outer peripheral surface of the blanket wheel 8, and the blanket 9 contacts the plate 7 formed on the outer peripheral surface of the plate cylinder 6 and contacts the can body 20. ing.

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.
In the can printing apparatus A, inks of different colors from the ink source 2 of each inker unit 1 were formed on the outer peripheral surface of the plate cylinder 6 via the ducting roll 3, the intermediate roller 4, and the rubber roller 5. The inks of the respective colors, which are attached to the plate 7, are placed on the blanket 9 on the rotating blanket wheel 8 as a pattern, and this pattern is printed while being in contact with the can body 20 held on the mandrel 11.

  The ink patterns of these colors are overlapped, and one design is printed on the can body 20. That is, the pattern printed on the can body 20 is formed by overlapping the patterns of the plates 7 of the plate cylinders 6 of the respective colors.

JP 09-267466 A JP 2001-129966 A

By the way, in the above can printing apparatus A, as described above, the pattern printed on the can body 20 can be obtained by stacking the patterns of the plates 7 formed on the outer peripheral surface of the plate cylinder 6 of each color inker unit 1. Since they are formed, it is necessary to match the positions of the plates 7 of the plate cylinders 6 of the respective colors with high accuracy, and high registration accuracy is required.
Conventionally, when the plate 7 is formed on the outer peripheral surface of the plate cylinder 6, a predetermined pattern is transferred to a plate-like plate material having photosensitivity, exposed, developed, and the same shape as the pattern placed on the blanket 9 After the plate 7 having the pattern was formed, the plate 7 was directly attached to the outer peripheral surface of the plate cylinder 6.

  However, when the plate 7 is attached to the plate cylinder 6, the position of the plate cylinder 6 in the axial direction and the circumferential direction may vary, or the plate 7 may be attached in a state where the pattern is deformed due to expansion and contraction. There is a problem that the registration accuracy is lowered. Further, it is necessary to affix the plate 7 while performing registration, and it takes a lot of time and labor to affix the plate 7.

  In addition, when the design of the can body 20 is changed, it is necessary to replace the plate 7 formed on the outer peripheral surface of the plate cylinder 6, but after the plate 7 on the plate cylinder 6 is peeled off, a new plate 7 is pasted. If it is attached, the time during which the printing apparatus is stopped becomes longer, and the printing efficiency is greatly reduced. Therefore, conventionally, the plate 7 is replaced by replacing the plate cylinder 6 detachably supported on the shaft portion with another plate cylinder 6 to which the plate 7 is previously attached.

  However, the plate cylinder 6 used in a normal can printing apparatus is made of steel or the like, and its weight is about 20 kg, which requires a lot of labor for replacement work. In addition, it is necessary to have and manage a large number of plate cylinders 6 according to each design, and there is a problem that the management cost is increased and the registration accuracy is reduced due to the dimensional variation of each plate cylinder 6. .

  Further, in order to improve the printing efficiency of the can printing apparatus, a plurality of plates 7 having the same pattern may be attached to the outer peripheral surface of one plate cylinder 6 in some cases. For example, in the case where two plates 7 are formed, printing for one can cylinder 20 can be performed by half the circumference of the plate cylinder 6 and printing efficiency is improved. There is a problem in that it is necessary to perform registration of the plurality of plates 7 with high accuracy, and the registration accuracy is further deteriorated due to variations in the registration.

The present invention has been made in view of the above circumstances, and can easily and accurately perform plate replacement work when changing the design of a can body, and can printing apparatus having high registration accuracy and The object is to provide a sleeve .

In order to solve the above problems, the present invention proposes the following means. The printing apparatus for a can according to claim 1 is a printing apparatus for a can provided with a cylinder body to which a cylindrical sleeve having a plate is replaceably attached, and a shaft portion that supports the cylinder body, wherein the cylinder body, the air ejection mechanism is provided for jetting air from the air hole opened in the outer peripheral surface of the cylinder body, the cylinder body is extended as well about the axis of the cylinder in which the cylinder body is formed An insertion hole is formed, and the shaft portion is configured to be inserted into the insertion hole from the other end side in the axial direction of the cylinder body, and the cylinder body is detachably supported by the shaft portion. are configured to be, the air ejection mechanism, communicates with the annular air chamber formed on the outer peripheral side of the insertion hole, from one end surface of the cylinder body to the air chamber An air supply hole formed so as to extend from the air chamber and opened to the outer peripheral surface of the cylinder body, and a plurality of first air holes provided in the circumferential direction on one end side of the cylinder body. 2 air holes, and a ring-shaped air chamber that communicates with the second air holes and is supplied with air therein.

In the printing apparatus for cans configured as described above, since the plate is formed on the outer peripheral surface of the cylindrical sleeve, it is not necessary to replace the entire plate cylinder when changing the design, and only the cylindrical sleeve is replaced. Just do it .
Further, since air can be ejected from the outer peripheral surface of the cylinder body, when the cylindrical sleeve is attached to or detached from the cylinder main body, the inner peripheral surface of the sleeve is expanded by the air.

The can printing apparatus according to claim 2 is characterized in that the ring-shaped air chamber is configured by a ring-shaped groove formed on one end side of the cylinder body .

The can printing apparatus according to claim 3 , wherein the cylinder body is formed with a tapered hole having the same center as the axis of the cylinder formed by the cylinder body, and the shaft portion can be inserted into the tapered hole. In addition to being formed in a taper shape, a cylinder pin for positioning the cylinder body and the shaft portion is provided.
In the can printing apparatus having the above configuration, since the tapered shaft portion is fitted into the tapered hole of the cylinder body, the axial relative positions of the shaft portion and the cylinder body can be matched. Moreover, when fitting a shaft part and a cylinder main body, the relative position of the circumferential direction of a cylinder main body and a shaft part can be match | combined with a cylinder pin.

In the can printing apparatus according to the first aspect, since only the cylindrical sleeve needs to be replaced when the plate is replaced, the time and labor required for the replacement can be reduced .
Further, since the inner peripheral surface of the sleeve can be expanded by air, the operation of fitting the sleeve into the cylinder body can be easily performed, and the labor and time required for the plate replacement operation can be reduced.

In the can printing apparatus according to claim 3, the axial relative position between the shaft portion and the cylinder body can be adjusted by the tapered hole, and the circumferential relative position between the cylinder body and the shaft portion can be adjusted by the cylinder pin. Since they can be aligned, it is not necessary to perform registration when the cylinder body is attached to the shaft portion, and the plate replacement operation can be performed easily and accurately.

As described above, according to the present invention, it is possible to provide a printing apparatus and a sleeve for a can that can easily and accurately perform plate replacement when changing the design of the can body, and that have high registration accuracy. it can.

It is a perspective view of the plate cylinder used for the printing apparatus of the can which is this embodiment. FIG. 2 is a front view of the sleeve shown in FIG. 1. It is XX sectional drawing in FIG. It is a front view of the cylinder main body shown by FIG. It is YY sectional drawing in FIG. It is a schematic explanatory drawing of the printing apparatus of a can.

Embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 shows a plate cylinder of a can printing apparatus according to an embodiment of the present invention, FIGS. 2 and 3 show a sleeve, and FIGS. 4 and 5 show a cylinder body. FIG. 6 shows an outline of the printing apparatus.
As described above, the printing apparatus A is roughly configured by the ink adhesion mechanism B and the can moving mechanism C. The ink adhesion mechanism B is in contact with the ink source 2 and the ducking roll that receives the ink in contact with the ink source 2. 3, an inker unit 1 comprising an intermediate roller 4 comprising a plurality of rollers connected to the ducting roll 3, a rubber roller 5 connected to the intermediate roller 4, and a plate cylinder 6 connected to the rubber roller 5, A blanket wheel 8 provided with a plurality of blankets 9 that come into contact with a plate 7 formed on the outer peripheral surface of the plate cylinder 6 is constituted.
The present invention relates to the plate cylinder 6 among these components.

As shown in FIG. 1, the plate cylinder 6 is formed in a substantially cylindrical shape, and includes a sleeve 31 positioned on the outer peripheral surface and a cylinder body 41 fitted to the inner peripheral surface of the sleeve 31.
The sleeve 31 is made of plastic resin, and the outer shape thereof is formed in a cylindrical shape as shown in FIGS. 2 and 3. The inner diameter and the outer diameter of the sleeve 31 are substantially constant in the axial direction of the cylinder formed by the sleeve 31. In addition, a sleep pin hole 32 having a circular cross section is formed in the sleeve 31 so as to penetrate along the radial direction of the sleeve 31.

  A plurality of plates 7 (two in the present embodiment) having a predetermined pattern are formed on the outer peripheral surface of the sleeve 31 in the circumferential direction to improve printing efficiency. These plates 7 are formed by photoetching the pattern of the two plates 7 as one image on the plate material 33 attached to the outer peripheral surface of the sleeve 31 with the double-sided adhesive tape 34. Yes.

The cylinder main body 41 fitted to the inner peripheral surface of the sleeve 31 is made of steel or the like, and as shown in FIGS. 4 and 5, the outer shape is formed in a columnar shape. It is assumed to be constant. The cylinder body 41 is formed with a coaxial tapered hole 42 having a cylindrical axis formed by the cylinder body 41 as the center and gradually decreasing in diameter toward the one end face 41A, and the end face of the tapered hole 42 is chamfered. Yes.
A sleeve pin 43 is provided on the outer peripheral surface of the cylinder body 41 so as to protrude outward in the radial direction of the cylinder body 41. A cylinder pin hole is formed on the other end face 41 </ b> B side of the cylinder body 41.

  A ring-shaped air chamber 45 is formed on the outer peripheral side of the tapered hole 42 of the cylinder body 41, and is parallel to the axis of the cylinder formed by the cylinder body 41 so as to communicate with the air chamber 45 from one end face 41A. An extending air supply hole 46 is provided. Further, a first air hole 47 extending from the air chamber 45 along the radial direction of the cylinder main body 41 and opened to the outer peripheral surface of the cylinder main body 41 faces the opposite side in the circumferential direction, as shown in FIG. It is formed at a position shifted in the axial direction.

  Further, a ring-shaped groove 48 is formed on one end face 41 </ b> A side of the cylinder body 41, and a supply path 49 that communicates from the air supply hole 46 to the ring-shaped groove 48 is provided. A plurality of second air holes 50 extending in the radial direction of the cylinder main body 41 from the ring-shaped groove 48 and opened in the outer peripheral surface of the cylinder main body 41 (in the present embodiment, as shown in FIG. 4). 6 places). In addition, a compressor (not shown) is connected to the air supply hole 46 via an air pipe (not shown). The air supply hole 46, the air chamber 45, the first air hole 47, the second air hole 50, the ring-shaped groove 48, and the supply path 49 constitute an air ejection mechanism.

  The cylinder body 41 is used by being fitted to a shaft portion 51 provided in the printing apparatus A and rotatably supporting the plate cylinder 6. The shaft portion 51 is formed in a tapered shape that can be fitted into the tapered hole 42 of the cylinder main body 41, and a cylinder pin is provided on the outer peripheral surface thereof. Then, the shaft portion 51 is fitted and fixed in the tapered hole 42 of the cylinder body 41, and the sleeve 31 is fitted to the outer peripheral surface of the cylinder body 41 to constitute the plate cylinder 6.

  Next, a procedure for fitting the sleeve 31 to the cylinder body 41 will be described. First, the sleeve 31 is fitted from one end surface 41 </ b> A side of the cylinder body 41, and the sleeve 31 is moved to a position that covers the second air hole 50. Here, when air is injected from the air supply hole 46 of the cylinder body 41 using a compressor, high-pressure air is ejected from the second air hole 50 through the supply path 49 and the ring-shaped groove 48 from the air supply hole 46. . The inner peripheral surface of the plastic resin sleeve 31 is expanded by the high-pressure air, and the fitting with the cylinder body 41 is performed smoothly. Further, since the high-pressure air is ejected from the first air hole 47 through the air chamber 45, even if the sleeve 31 is fitted to the central portion of the cylinder body 41, the plastic resin sleeve 31 is provided by the high-pressure air. The inner peripheral surface of the sleeve 31 is expanded and the sleeve 31 is smoothly fitted.

When the supply of high-pressure air is stopped after the sleeve 31 is moved and the sleeve pin 43 is inserted into the sleeve pin hole 32, the sleeve 31 is restored to its original inner diameter and fixed so as to be in close contact with the outer peripheral surface of the cylinder body 41.
Further, when the sleeve 31 is removed from the cylinder body 41, the inner peripheral surface of the sleeve 31 is pushed and expanded in the axial direction of the cylinder body 41 by supplying high-pressure air as described above.

  In the can printing apparatus A configured as described above, since the plate 7 is formed on the sleeve 31 made of plastic resin, when changing the pattern printed on the can body 20, only the very light sleeve 31 is replaced. The time and labor required to replace the plate 7 can be greatly reduced. Further, since it is not necessary to remove the cylinder body 41, the management cost can be reduced without having to manage and manage a large number of cylinder bodies 41, and a decrease in registration accuracy due to dimensional variations of the cylinder body 41 can be prevented.

  Further, since the pattern of the plate 7 is formed by directly performing photoetching on the plate material 33 attached to the outer peripheral surface of the sleeve 31, the operation of attaching the plate 7 becomes unnecessary, and the operation of attaching the plate 7 There is no variation in time, and the registration accuracy can be greatly improved. Further, although the two plates 7 are formed on the sleeve 31, since the two plates 7 are subjected to photo-etching as one image, it is not necessary to register the two plates 7 with each other. Therefore, even if the two plates 7 are arranged on the outer peripheral surface of the plate cylinder 6, the registration accuracy is not lowered.

  Further, when the sleeve 31 is replaced, the cylinder body 41 is provided with an air ejection mechanism, and high-pressure air is ejected from the first air hole 47 and the second air hole 50 opened on the outer peripheral surface of the cylinder body 41. Since the inner peripheral surface of the plastic sleeve 31 can be expanded, the replacement operation of the sleeve 31 can be performed more efficiently and easily. Further, since the sleeve 31 is provided with the sleeve pin hole 32 and the cylinder main body 41 is provided with the sleeve pin 43, the registration at the time of replacement of the sleeve 31 can be performed easily and accurately, and the registration accuracy is improved. be able to.

  In addition, a tapered hole 42 is formed in the cylinder body 41, and the shaft portion 51 is fitted into the tapered hole 42. Therefore, the shaft portion 51 and the cylinder body 41 are aligned in the axial direction by fitting the tapered hole 42. It can be performed easily and accurately. Moreover, since the cylinder body 41 is provided with a cylinder pin hole and the shaft portion 51 is provided with a cylinder pin, the circumferential alignment between the shaft portion 51 and the cylinder body 41 can be easily and accurately performed. . Accordingly, it is possible to prevent a decrease in registration accuracy when the cylinder body 41 is replaced.

In the present embodiment, the case where two plates 7 are formed on the outer peripheral surface of the sleeve 31 is described. However, the number of plates 7 is not limited, and photoetching is performed using the plates 7 as one image. It is sufficient that the plate 7 is formed.
Further, although the description has been made with the air ejection mechanism such as the first air hole 47 and the second air hole 50 provided in the cylinder body 41, the air ejection mechanism may not be provided. Further, the number of the first air holes 47 and the second air holes 50 is not limited, and it is preferable to appropriately determine the size of the cylinder body 41, the thickness of the cylinder of the sleeve 31, and the like. Further, the air chamber 45, the ring-shaped groove 48, and the air supply hole 46 are not limited to this embodiment as long as the air can be appropriately ejected from the outer peripheral surface of the cylinder body 41. .

6 Plate cylinder 7 Plate 31 Sleeve 32 Sleeve pin hole 33 Plate material 41 Cylinder body 42 Taper hole 43 Sleeve pin 47 First air hole (air hole)
50 Second air hole (air hole)
51 Shaft A Printing Device

Claims (3)

A printing apparatus for a can provided with a cylinder body to which a cylindrical sleeve having a plate is interchangeably attached, and a shaft portion supporting the cylinder body,
The cylinder body is provided with an air ejection mechanism that ejects air from an air hole opened in the outer peripheral surface of the cylinder body,
The cylinder body is formed with an insertion hole extending similarly around the axis of the cylinder formed by the cylinder body, and the shaft portion is inserted into the insertion hole from the other end side in the axial direction of the cylinder body. And the cylinder body is configured to be detachably supported by the shaft portion,
The air ejection mechanism includes a ring-shaped air chamber formed on the outer peripheral side of the insertion hole, an air supply hole formed to communicate with the air chamber from one end surface of the cylinder body, and the air chamber A first air hole extending from the outer circumferential surface of the cylinder body, a plurality of second air holes provided in the circumferential direction on one end side of the cylinder body, and the second air hole. And a ring-shaped air chamber into which air is supplied.   2. The can printing apparatus according to claim 1, wherein the ring-shaped air chamber includes a ring-shaped groove formed on one end side of the cylinder body. The cylinder body is formed with a tapered hole having the same center as the axis of the cylinder formed by the cylinder body,
2. The shaft according to claim 1, wherein the shaft is formed in a taper shape that can be inserted into the taper hole, and includes a cylinder pin for aligning the cylinder body and the shaft. Item 3. A printing apparatus for cans according to item 2.

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