JP2005219412A - Printing cylinder structure of rotary printing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide the printing cylinder structure of a rotary machine, in which the generation of vibration and the missing of tension due to gaps is suppressed and the printing difficulties resulting therefrom are prevented from developing and, at the same time, neither mounting nor dismounting work of a blanket nor the like is troublesome. <P>SOLUTION: In this rotary printing machine, on a blanket cylinder 2, two sheets of blankets 7 can be wound by axially arranging side by side under the constitution that gaps 2a and 2b for anchoring the winding end parts of the respective blankets 7 are formed on the outer periphery of the blanket cylinder 2. These gaps 2a and 2b are provided in the circumferential direction of the blanket cylinder 2 under being shifted in phase by 180° and, at the same time, rising parts 2c and 2d are provided on the extension lines of the respective gaps 2a and 2b along the axial direction of the blanket cylinder 2 on the outer periphery of the blanket cylinder 2. As a result, at printing, since a plate cylinder 1 rotates in the fashion so as to get over the rising parts 2c and 2d, the plate cylinder 1 is prevented from falling in the respective gaps 2a and 2b. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a printing cylinder structure of a rotary printing press comprising a blanket cylinder, a plate cylinder, an ink roll group for transferring printing ink to a plate cylinder, and the like, which are equipped in a printing section of various rotary printing presses such as an offset rotary printing press.

  In the printing cylinder structure of a conventional rotary printing press, printing ink on the printing surface of the printing plate wound around the outer periphery of the plate cylinder is wound around the outer periphery of the blanket cylinder between the plate cylinder and the blanket cylinder. A certain printing pressure is applied to ensure transfer to the blanket.

  On the other hand, on the outer circumferences of the plate cylinder and the blanket cylinder, gaps (grooves) are formed as shown in FIG. 10 in order to lock the winding end portions of the printing plate and the blanket, respectively. 2a is set so as to always rotate in the form facing each other at the same position. Therefore, when the gaps 1a and 2a are aligned over the entire body width, a state in which no printing pressure is applied is periodically generated and vibrations are generated, which may cause shock marks and the like. The tension (tension) applied to the (paper) surface becomes large, causing the web to shift.

  Therefore, in order to suppress the occurrence of such a vibration and the occurrence of a printing failure due to a tension drop, conventionally, as described in Non-Patent Document 1, for example, a printing cylinder using a plate cylinder having a width of 4 pages, for example. In the case of the structure, the gap is shifted in units of two page widths. As a result, in the mainstream printing cylinder structure using a two-page circumferential plate cylinder, the occurrence of vibration due to the gap and the loss of tension have been reduced to an acceptable level. However, in recent years, there has been a growing demand for more accurate printing, and this technology has made it difficult to respond.

  On the other hand, in Patent Document 1, the gap is divided into four or more in the body width direction, and the phase of each of the divided gaps is shifted so as to reduce the occurrence of vibration due to the gap and the loss of tension. A printed cylinder structure is disclosed.

However, the printing cylinder structure of Patent Document 1 has a problem that four or more blankets have to be wound around the blanket cylinder, and the attaching and removing operations are troublesome.
JP-A-10-71694 Japan Newspaper Association Technical Committee, “Newsprint Handbook”, 1st edition, 2nd edition, Japan Newspaper Association, March 31, 1999, p. 58-59

  Accordingly, the present invention suppresses the occurrence of vibration due to the gap and the loss of tension to prevent the occurrence of printing troubles such as shock marks, and the printing of a rotary press that does not bother the work of attaching and removing the blanket. An object is to provide a trunk structure.

  In order to achieve the above object, the printing cylinder structure of the rotary printing press according to the present invention comprises a group of ink rolls in which printing ink is sequentially transferred at adjacent portions, and an ink film is formed in the transfer process, and the final roll of the ink roll group. A printing cylinder having a printing surface for transferring the ink film is wound around the outer periphery, and a blanket for transferring the printing ink transferred to the printing surface of the printing plate to the traveling web surface is printed on the outer periphery. A printing cylinder structure of a rotary printing press including a wound blanket cylinder. Two blankets can be wound side by side in the axial direction on the blanket cylinder, and each blanket is wound around the outer periphery of the blanket cylinder. A gap for locking the end is formed, and the gap for locking the winding end of one blanket is a gap for locking the winding end of the other blanket. The blanket cylinder is provided with a phase shifted in the circumferential direction of the blanket cylinder, and the blanket wound on the outer circumference of the blanket cylinder or on the blanket cylinder on the extension line of each gap along the axial direction of the blanket cylinder. A raised portion is formed.

  In the printing cylinder structure of the rotary printing press, the raised portion may be formed over the entire width of the blanket winding portion except the gap forming portions. Moreover, the said protruding part shall be formed wider than the width | variety of each said gap in the circumferential direction of a blanket cylinder. Furthermore, the said protruding part shall be formed so that it might become a curved surface shape in the circumferential direction of a blanket cylinder.

  Further, the printing cylinder structure of the rotary printing press according to the present invention transfers the ink film from the ink roll group that sequentially transfers the printing ink at the adjacent portion and forms the ink film in the transfer process, and the final roll of the ink roll group. A plate cylinder on which a printing plate having a printing surface is wound around the outer periphery, and a blanket cylinder on which a blanket for transferring the printing ink transferred to the printing surface of the printing plate to the running web surface is printed on the outer periphery. The printing cylinder structure of the rotary printing press includes two blankets that can be wound side by side in the axial direction, and the winding end of each blanket is locked to the outer periphery of the blanket cylinder. A gap for locking the winding end of one blanket is formed with respect to the gap for locking the winding end of the other blanket. The plate cylinder is provided with a phase shift in the circumferential direction of the printing cylinder, and the printing plate wound around the outer periphery of the printing cylinder or the printing cylinder is located at a position on the extension line of each gap of the blanket cylinder during printing. A raised portion is formed along the axial direction of the trunk.

  In the printing cylinder structure of the rotary printing press, the raised portion may be formed over the entire width of the portion corresponding to the wound portion of the blanket, except for the portions where the gaps are formed. Moreover, the said protruding part shall be formed wider than the width | variety of each said gap in the circumferential direction of a blanket cylinder. Furthermore, the said protruding part shall be formed so that it might become a curved surface shape in the circumferential direction of a plate_cylinder | printing_drum.

  The present invention has the following effects.

1. Providing a raised portion on the extended line of the gap of the blanket cylinder prevents the plate cylinder from falling into the gap during printing, so it is possible to suppress the occurrence of vibrations and loss of tension, and to print shock marks and the like associated therewith The occurrence of failures can be prevented.

2. Since it is not necessary to divide the blanket more than necessary, the operation of attaching and removing the blanket does not become troublesome.

3. By providing the raised portion over the entire width of the blanket mounting portion excluding the gap portion of the blanket cylinder, it is possible to more effectively prevent the plate cylinder from falling into the gap.

4). By making the width of the raised portion wider than the width of the gap, it is possible to more effectively prevent the plate cylinder from falling into the gap.

5). By forming the raised portion in a curved shape along the circumferential direction of the blanket cylinder or the plate cylinder, the impact at the time of getting over the raised portion is reduced, and the occurrence of vibration and the loss of tension can be more effectively suppressed.

6). By providing the raised portion on the blanket or printing plate, there is no need to process the blanket cylinder or plate cylinder, so that the existing blanket cylinder or plate cylinder can be used as it is.

  Embodiments of the present invention will be described below based on examples shown in the drawings.

  FIG. 1 is an explanatory diagram showing a configuration of a printing unit of a rotary printing press to which a printing cylinder structure of the present invention is applied. The printing section of the rotary printing press shown in the figure is composed of a plate cylinder 1 around which a printing plate is wound, a blanket cylinder 2 around which a rubber blanket is wound, an inking device 3 and a dampening solution device 4. Printing elements to be set on the left and right.

  The inking device 3 includes an ink pump 3a and an ink roll group 3b composed of a plurality of ink rolls. The printing ink supplied from the ink pump 3a is sequentially transferred as an ink film by the ink roll group 3b. The ink film is transferred to the printing surface of the printing plate wound around the outer periphery of the plate cylinder 1 by the final roll 3b-1 in contact with.

  The fountain solution device 4 comprises a spiral brush type fountain solution supply device 4a and two rolls, and supplies the fountain solution from the fountain solution supply device 4a to the printing surface of the printing plate.

  In addition, the printing section of the rotary printing press shown in FIG. 1 includes a single color printing device 5, and another printing ink such as red ink supplied from the ink fountain 5a is passed through one spot plate cylinder 5b. The blanket cylinder 2 can be supplied. Also in the monochromatic printing apparatus 5, the fountain solution is supplied from the fountain solution supply machine 5c.

  In the above configuration, printing ink and dampening water are respectively supplied from the inking device 3 and the dampening water supply device 4 to the printing surface (not shown) of the printing plate wound around the outer periphery of the plate cylinder 1. The printing ink on the printing surface of the printing plate is transferred to the blanket cylinder 2 and transferred and printed simultaneously on the web W running between the pair of blanket cylinders 2.

  2A and 2B are diagrams showing an embodiment of the blanket cylinder of the present invention applied to the printing unit of the rotary printing press of FIG. 1, wherein FIG. 2A is a perspective view, and FIG. 2B is a line AA in FIG. (C) is sectional drawing by the BB line arrow of (b), (d) is an expanded sectional view by the CC line arrow of (a). In FIG. 2, for the sake of convenience, the bearer at the end of the blanket cylinder is omitted.

  A blanket cylinder 2 shown in FIG. 2 is configured such that two 2-page-wide blankets are wound side by side in the axial direction, and an aluminum fillet bar 7b serving as a winding end of each blanket is disposed on the outer periphery of the blanket cylinder 2. Gap 2a, 2b for locking (refer FIG. 5) by a winding system or a T-bar system is formed. Here, the gap 2a for locking the aluminum fillet bar 7b of one blanket and the gap 2b for locking the aluminum fillet bar 7b of the other blanket are 180 degrees in the circumferential direction of the blanket cylinder 2. Are provided. Further, on the outer periphery of the blanket cylinder 2, raised portions 2c and 2d are formed on the extended lines of the gaps 2a and 2b along the axial direction of the blanket cylinder 2, respectively.

  As shown in FIG. 2D, the raised portions 2c and 2d are formed in a gently curved shape along the circumferential direction of the blanket cylinder 2, and the height t is set to 0.03 mm in the embodiment. The width w was set to 15 mm wider than the width (5 mm) in the circumferential direction of the blanket cylinder 2 of the gaps 2a and 2b. The raised portions 2c and 2d can be formed by processing the outer circumference of the blanket cylinder 2 after welding. Moreover, as shown in FIG. 3, it can also form by sticking the tape 6 on the outer periphery of the blanket cylinder 2, and you may build-up by plating.

  FIG. 4 is a schematic side view showing a rotational contact state between the blanket cylinder and the plate cylinder. The blanket cylinder 2 is wound with two two-page-wide blankets 7 arranged in the axial direction, and the plate cylinder 1 is similarly wound with two two-page-wide printing plates 8 arranged in the axial direction. Yes. Further, on the outer periphery of the plate cylinder 1, there is formed a single gap 1a for locking the holding side and the holding bottom side of each printing plate 8 using a spring or the like. This gap 1a is formed during printing. Are always facing the same position as the gap 2a or 2b of the blanket cylinder 2.

  FIG. 4 shows a case where the plate cylinder 1 has a one-page circumference and the blanket cylinder 2 has a two-page circumference.

  In such a configuration, as described above, the blanket cylinder 2 is formed with the raised portions 2c and 2d on the extended lines of the gaps 2a and 2b, respectively. Therefore, as shown in FIG. Even if the gap 1a and the gap 2a of the blanket cylinder 2 face each other at the same position, the plate cylinder 1 rotates so as to get over the raised portion 2c of the blanket cylinder 2, thereby preventing the gap 2a from dropping. Tension dropout can be suppressed. Therefore, it is possible to suppress the occurrence of vibration due to the tension drop and the plate cylinder 1 falling into the gaps 2a and 2b of the blanket cylinder 2, and the occurrence of printing troubles associated therewith can be prevented.

  Also, since the procedure for attaching and removing the blanket is the same as in the conventional case using two blankets, there is no inconvenience.

  Furthermore, in this embodiment, as shown in FIG. 2, the raised portions 2c and 2d are formed over the entire width of the blanket winding portion except for the portions where the gaps 2a and 2b are formed. The parts 2c and 2d can be overcome, and the occurrence of vibrations and the loss of tension can be further suppressed. The raised portions 2c and 2d are formed in a gently curved shape along the circumferential direction of the blanket cylinder 2 and are wider than the widths of the gaps 2a and 2b. 2d can be overcome more smoothly.

  FIG. 5 is a perspective view of a blanket used in the printing cylinder structure according to the second embodiment of the present invention, and FIG. 6 is a perspective view showing a state where the blanket of FIG. 5 is wound around the blanket cylinder. In FIG. 5, the same components as those of the first embodiment are denoted by the same reference numerals, and the description thereof is omitted. In FIG. 5, bearers and the like are omitted as in FIG.

  In the first embodiment, the raised portion is provided on the blanket cylinder, but in this embodiment, the raised portion is provided on the blanket. In this embodiment as well, two blankets 7 each having a width of two pages are wound around the blanket cylinder 2 side by side in the axial direction.

  As shown in FIG. 6, the raised portion 7 a provided on one blanket 7 is wound so as to be positioned on an extension line of the gap 2 a of the blanket cylinder 2. The raised portion 7 a provided on the other blanket 7 is wound so as to be positioned on an extension line of the gap 2 b of the blanket cylinder 2. The shape of the raised portion 7a is the same as the raised portions 2c and 2d of the first embodiment.

  FIG. 7 is a schematic side view showing a rotational contact state between the blanket cylinder and the plate cylinder in the present embodiment. As shown in the figure, even if the gap 1a of the plate cylinder 1 and the gap 2a of the blanket cylinder 2 face each other at the same position, the plate cylinder 1 rotates so as to get over the raised portion 7a of the blanket 7. , It is possible to prevent the gap 2a from dropping and to prevent the tension from coming off. Therefore, similarly to the first embodiment, it is possible to suppress the occurrence of vibration due to the tension drop and the plate cylinder 1 falling into the gaps 2a and 2b of the blanket cylinder 2, and the occurrence of printing troubles associated therewith can be prevented.

  Furthermore, in this embodiment, since the raised portion 7a is provided in the blanket 7, it is not necessary to process the blanket cylinder 2, and the existing blanket cylinder 2 can be used as it is.

  FIG. 8 is a perspective view showing a printing plate and a plate cylinder used in the printing cylinder structure according to the third embodiment of the present invention. In this embodiment, a raised portion is provided on the printing plate 8. In FIG. 8, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted. In FIG. 8, for the sake of convenience, bearers and the like at the end of the plate cylinder are omitted.

  The plate cylinder 1 shown in FIG. 8 is configured so that two plates 8 having a width of two pages and a circumference of two pages are arranged side by side in the axial direction and wound around the outer periphery of the plate cylinder 1. Gaps 1a and 1b for locking the holding side and the holding bottom side using a spring or the like are formed. Here, the gap 1a for locking the holding side and the holding bottom side of one printing plate 8 and the gap 1b for locking the holding side and the holding bottom side of the other printing plate 8 are a plate cylinder. 1 is provided with a phase shift of 180 degrees in the circumferential direction. These gaps 1a and 1b are always facing each other at the same position as the gap 2a and gap 2b of the blanket cylinder 2 during printing.

  Each printing plate 8 is provided with a raised portion 8a, and the raised portion 8a provided on one printing plate 8 is wound so as to be positioned on an extension line of the gap 1a of the plate cylinder 1. The raised portion 8 a provided on the other printing plate 8 is wound so as to be positioned on an extension line of the gap 1 b of the plate cylinder 1. The shape of the raised portion 8a is the same as the raised portions 2c and 2d of the first embodiment.

  FIG. 9 is a schematic side view showing a rotational contact state between the plate cylinder and the blanket cylinder in the present embodiment. As shown in the figure, even if the gap 1a of the plate cylinder 1 and the gap 2a of the blanket cylinder 2 face each other at the same position, the plate cylinder 1 has a blanket cylinder 2 corresponding to the raised portion 8a of the printing plate 8. Since it rotates in a form away from the gap, it is possible to prevent the gap 2a from falling and to prevent the tension from coming off. Therefore, it is possible to suppress the occurrence of vibration due to the tension drop and the plate cylinder 1 falling into the gaps 2a and 2b of the blanket cylinder 2, and the occurrence of printing troubles associated therewith can be prevented.

  Furthermore, in this embodiment, since the raised portion 8a is provided in the printing plate 8, there is no need to process the plate cylinder 1, and the existing plate cylinder 1 can be used as it is.

  Although the embodiment has been described above, the present invention is not limited to this. For example, in the first and second embodiments, a plate cylinder having a one-page circumference is used, but a two-page circumference may be used similarly to the blanket cylinder. In other words, the length and diameter of the plate cylinder and the blanket cylinder are not limited as long as the raised portions are always located at positions where the gaps between the plate cylinder and the blanket cylinder face each other during printing.

  Further, the height and width of the raised portion can be changed according to printing conditions and the gap width. In addition, as the raised portion is formed on the blanket cylinder, the raised portion is formed on the extended line of the gap formed in the plate cylinder on the plate cylinder, and a normal printing plate is wound around the plate cylinder. May be.

  In addition, the raised portions may be formed intermittently, or may have a width equal to or greater than the width of the gap.

  The present invention is applicable to the structure of a plate cylinder and a blanket cylinder used in a printing section of various rotary printing presses such as an offset rotary printing press.

It is explanatory drawing which shows the structure of the printing part of the rotary printing press to which the printing cylinder structure of this invention is applied. It is a figure which shows one Example of the blanket cylinder of this invention applied to the printing part of the rotary printing machine of FIG. 1, (a) is a perspective view, (b) is the cross section by the AA arrow of (a). (C) is sectional drawing by the BB arrow of (b), (d) is an expanded sectional view by the CC arrow of (a). It is an expanded sectional view which shows the other Example of the protruding part formed in the outer periphery of a blanket cylinder. It is a schematic side view which shows the rotation contact state of a blanket cylinder and a plate cylinder. It is a perspective view of the blanket used for the printing cylinder structure which concerns on 2nd Example of this invention. It is a perspective view which shows the state which wound the blanket of FIG. 5 around the blanket cylinder. It is a schematic side view which shows the rotation contact state of the blanket cylinder and plate cylinder in 2nd Example. It is a perspective view which shows the printing plate and plate cylinder which are used for the printing cylinder structure which concerns on 3rd Example of this invention. It is a schematic side view which shows the rotation contact state of the plate cylinder and blanket cylinder in 3rd Example. It is sectional drawing of the principal part which shows the positional relationship at the time of the printing of the gap formed in the plate cylinder, and the gap formed in the blanket cylinder.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Plate cylinder 1a, 1b Gap 2 Blanket cylinder 2a, 2b Gap 2c, 2d Raised part 3 Inking apparatus 3a Ink pump 3b Ink roll group 3b-1 Final roll of ink roll group 4 Dampening water apparatus 4a Dampening water supply machine 5 Monochromatic printing device 5a Ink fountain 5b Spot plate cylinder 5c Dampening solution feeder 6 Tape (protrusion)
7 Blanket 7a Raised part 7b Aluminum fillet bar (winding end)
8 Plate 8a Raised W Web

Claims (8)

A plate in which a printing plate having a printing surface for transferring the ink film from the final roll of the ink roll group and an ink roll group that sequentially transfers printing ink at adjacent portions and forming an ink film in the transfer process is wound around the outer periphery. A printing cylinder structure of a rotary printing press including a cylinder and a blanket cylinder on which a blanket to be transferred and printed on a web surface that travels the printing ink transferred to the printing surface of the printing plate is wound;
Two blankets can be wound side by side in the axial direction on the blanket cylinder, and a gap is formed on the outer periphery of the blanket cylinder to lock the winding end of each blanket. The gap for locking the winding end is provided with a phase shifted in the circumferential direction of the blanket cylinder with respect to the gap for locking the winding end of the other blanket,
The printing cylinder of a rotary printing press is characterized in that a bulge is formed on the extended line of each gap along the axial direction of the blanket cylinder on the outer periphery of the blanket cylinder or on the blanket cylinder. Construction.   2. The printing cylinder structure of a rotary printing press according to claim 1, wherein the raised portion is formed across the entire width of a blanket winding portion except for the portions where the gaps are formed.   The printing cylinder structure of a rotary printing press according to claim 1 or 2, wherein the raised portion is formed wider than the width of each gap in the circumferential direction of the blanket cylinder.   The printing cylinder structure of a rotary printing press according to any one of claims 1 to 3, wherein the raised portion is formed in a curved shape in a circumferential direction of the blanket cylinder. A plate in which a printing plate having a printing surface for transferring the ink film from the final roll of the ink roll group and an ink roll group that sequentially transfers printing ink at adjacent portions and forming an ink film in the transfer process is wound around the outer periphery. A printing cylinder structure of a rotary printing press including a cylinder and a blanket cylinder on which a blanket to be transferred and printed on a web surface that travels the printing ink transferred to the printing surface of the printing plate is wound;
Two blankets can be wound side by side in the axial direction on the blanket cylinder, and a gap is formed on the outer periphery of the blanket cylinder to lock the winding end of each blanket. The gap for locking the winding end is provided with a phase shifted in the circumferential direction of the blanket cylinder with respect to the gap for locking the winding end of the other blanket,
Further, the printing plate wound around the outer periphery of the plate cylinder or the plate cylinder is formed with a raised portion along the axial direction of the plate cylinder at a position on the extension line of each gap of the blanket cylinder during printing. A printing cylinder structure of a rotary printing press characterized by   6. The printing cylinder structure of a rotary printing press according to claim 5, wherein the raised portion is formed over the entire width of a portion corresponding to a winding portion of the blanket, except for a portion where the gaps are formed.   The printing cylinder structure of a rotary printing press according to claim 5 or 6, wherein the raised portion is formed wider than the width of each gap in the circumferential direction of the blanket cylinder.   The printing cylinder structure of a rotary printing press according to any one of claims 5 to 7, wherein the raised portion is formed to have a curved surface in the circumferential direction of the plate cylinder.

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