JP2010111028A - Printing roller and printer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve printing quality by suppressing heat generation and to minimize a cost increase in a printing roller and a printer. <P>SOLUTION: An elastic member 52 of uniform thickness is mounted to the outer peripheral surface of a cylindrical core material (an iron core) 51, and the inner peripheral surface of the elastic member 52 is provided with cavity parts 53 serving as non-contact with the outer peripheral surface of the core material 51. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a printing roller used in a printing unit such as an offset sheet-fed printing press or a rotary offset printing press, and a printing press to which the printing roller is applied.

  In general, an offset rotary printing press includes a paper feeding device, an infeed device, a printing device, a drying device, a cooling device, a web pass device, a folding device, and a paper discharge device. The paper feeding device has a reel stand on which two winding bodies (web rolls) are mounted, and a web that is drawn out of one winding body and is running is used as the web of the other winding body. By connecting, it has a printing machine that can continuously supply the web. The in-feed device supplies a web drawn from a winding body of a paper feeding device to a printing device at a predetermined speed. In the printing apparatus, generally, four sets of printing units corresponding to four colors of black, cyan, magenta, and yellow are arranged in parallel along the web traveling direction. The drying device is for drying ink on the web printed by the printing device, and the cooling device is for cooling the web that stores excess heat after drying in the drying device to an appropriate temperature. It is. The web pass device conveys the dried and cooled web, and the folding device cuts the web after being vertically folded and folds it to a predetermined size to form a folded book. The paper device is to carry out the folded or folded book outside the apparatus.

  Therefore, a roll-shaped web is pulled out from the winding body by the paper feeding device, the web is supplied to the printing device at a predetermined speed by the infeed device, and multicolor printing is performed by each printing unit in the printing device, The printed web is dried with an ink by a drying device, cooled with a cooling device, a signature is created by a folding device conveyed through a web pass device, and is carried out by a paper discharge device.

  In each printing unit of a printing apparatus in such an offset rotary printing press, an ink application roller used as a printing roller is configured to have an elastic member on the outer periphery. As a conventional ink application roller, for example, there is one described in Patent Document 1 below. In the printing apparatus of the printing machine described in Patent Document 1, a rubber blanket sleeve can be fitted on the outer peripheral portion of the ink application roller and can be removed.

JP 2001-277748 A

  In a printing machine, it is generally desirable to increase the hardness of an elastic member (rubber blanket) mounted on the outer periphery of the ink deposition roller, that is, to increase the hardness, in order to improve the ink deposition property. However, if the hardness of the elastic member in the ink application roller is increased, heat is generated when the elastic member undergoes volume deformation, and this heat is accumulated inside the elastic member, which may adversely affect the ink transferred to the outer peripheral surface. There is sex. In this case, it is conceivable to apply a multi-layer blanket as the elastic member. However, this blanket is composed of a base fabric layer, a foam layer and a rubber layer, and there is a problem that the material cost and the manufacturing cost increase.

  SUMMARY An advantage of some aspects of the invention is to provide a printing roller and a printing machine that can suppress heat generation by suppressing heat generation to improve printing quality.

  In order to achieve the above object, the printing roller of the invention of claim 1 is a printing roller in which an elastic member having a uniform thickness is mounted on the outer peripheral surface of a cylindrical core material, and the inner periphery of the elastic member. The surface is provided with a void portion that is not in contact with the outer peripheral surface of the core member.

  In the printing roller according to a second aspect of the present invention, the gap is provided on the inner peripheral surface of the elastic member, whereby the outer peripheral surface of the core member and the inner peripheral surface of the elastic member are in a point contact state. It is a feature.

  In the printing roller according to a third aspect of the present invention, the gap is a plurality of grooves formed along the circumferential direction on the inner peripheral surface of the elastic member and arranged in parallel in the axial direction, and the core member The outer peripheral surface of the elastic member and the inner peripheral surface of the elastic member are in a line contact state.

  In the printing roller according to a fourth aspect of the present invention, the gap is a spiral groove formed on the inner circumferential surface of the elastic member along the spiral direction and arranged in parallel in the axial direction. The outer peripheral surface and the inner peripheral surface of the elastic member are in a line contact state.

  The printing roller according to the invention of claim 5 is characterized in that a high elastic layer having a hardness higher than the hardness of the elastic member is provided at an intermediate portion in the thickness direction of the elastic member.

  According to a sixth aspect of the present invention, there is provided a printing machine comprising: an ink storage unit that stores ink; an ink source roller that supplies ink in the ink storage unit; a delivery roller that delivers ink from the ink source roller; and the delivery roller An ink application roller for supplying the transferred ink, a plate cylinder to which the ink of the ink application roller is transferred to the image line unit, a blanket cylinder for transferring the ink transferred to the plate cylinder to a printing paper, Are supported in a rotatable manner in series with each other, and the ink application roller is configured by mounting an elastic member having a uniform thickness on an outer peripheral surface of a cylindrical core material, and an inner peripheral surface of the elastic member A gap portion that is not in contact with the outer peripheral surface of the core member is provided.

  According to the printing roller of the first aspect of the present invention, an elastic member having a uniform thickness is mounted on the outer peripheral surface of the core material having a cylindrical shape, and the inner peripheral surface of the elastic member is formed with respect to the outer peripheral surface of the core material. A non-contact gap is provided. Therefore, even if heat is generated when the elastic member undergoes volume deformation, this heat is absorbed by the core material through the gap, and the temperature rise in the elastic member is suppressed and the effect on the ink transferred to the outer peripheral surface is suppressed. Can be reduced. Further, by suppressing the heat generation in the elastic member, the hardness of the elastic member can be set high to improve the ink deposition property, and the print quality can be improved. Furthermore, an increase in material cost can be suppressed.

  According to the printing roller of the second aspect of the invention, by providing the gap on the inner peripheral surface of the elastic member, the outer peripheral surface of the core member and the inner peripheral surface of the elastic member are brought into a point contact state. Heat generation is easily absorbed by the core member through the gap, and the temperature rise in the elastic member can be effectively suppressed.

  According to the printing roller of the third aspect of the present invention, the gap portion is formed in the inner peripheral surface of the elastic member along the circumferential direction, and the plurality of groove portions are arranged in parallel in the axial direction, and the outer peripheral surface of the core member and the elastic member Since the core and elastic member are in contact with each other along the circumferential direction, the circumferential direction of the elastic member can be suppressed and the print quality can be improved. .

  According to the printing roller of the fourth aspect of the present invention, the gap portion is formed along the spiral direction on the inner peripheral surface of the elastic member and is formed as a spiral groove portion arranged in parallel in the axial direction, and the outer peripheral surface of the core member and the elastic member Since the inner peripheral surface is in a line contact state, the core material and the elastic member are in a contact state by a line along the spiral direction, and the deformation of the elastic member in the circumferential direction and the axial direction is suppressed to improve the print quality. Can do.

  According to the printing roller of the fifth aspect of the invention, since the high elastic layer having a hardness higher than the hardness of the elastic member is provided at the intermediate portion in the thickness direction of the elastic member, the high elastic layer causes the circumferential direction and the axial direction of the elastic member. It is possible to improve the print quality by suppressing the deformation.

  According to the printing machine of the invention of claim 6, the ink reservoir, the ink base roller, the delivery roller, the ink application roller, the plate cylinder and the blanket cylinder are in series contact with each other and rotatably supported, An elastic member having a uniform thickness is mounted on the outer peripheral surface of the cylindrical core material, and a gap is formed on the inner peripheral surface of the elastic member so as not to contact the outer peripheral surface of the core material. Therefore, even when the elastic member of the ink application roller deforms and generates heat during printing, this heat is absorbed by the core material through the gap, and the temperature rise in the elastic member is suppressed to the outer peripheral surface. The influence on the transferred ink can be reduced. Further, by suppressing the heat generation in the elastic member, the hardness of the elastic member can be set high to improve the ink deposition property, and the print quality can be improved. Furthermore, an increase in material cost can be suppressed.

  Exemplary embodiments of a printing roller and a printing machine according to the present invention will be described below in detail with reference to the accompanying drawings. In addition, this invention is not limited by this Example.

  FIG. 1 is a cross-sectional view of an essential part of an ink form roller as a printing roller according to Embodiment 1 of the present invention, and FIG. 2 is a schematic view showing an inner peripheral surface of elastic rubber in the ink form roller of Embodiment 1. 3 is a schematic diagram showing the action at the time of elastic deformation in the ink application roller of the first embodiment, FIG. 4 is a schematic configuration diagram showing the printing unit of the first embodiment, and FIG. 5 is a schematic diagram showing the printing machine of the first embodiment. FIG. 6A and FIG. 6B are schematic diagrams illustrating the inner peripheral surface of the elastic rubber in the modified example of the ink form roller of the first embodiment.

  The printing press of Example 1 is an offset rotary printing press using water-based ink, and as shown in FIG. 5, a paper feeding device 11, an infeed device 12, a printing device 13, a drying device 14, It comprises a cooling device 15, a web pass device 16, a folding device 17, and a paper discharge device 18.

  The paper feeding device 11 has a reel stand on which two winding bodies (web rolls) are mounted. The web (printing paper) that is drawn out from one winding body and travels is transferred to the other winding body. By connecting to the web of the collecting body, it has a paper splicing device that can continuously supply the web. The infeed device 12 supplies the web of the paper feeding device 11 to the printing device 13 side. The printing device 13 includes four printing units 21, 22, 23, and 24 for four water-based ink colors Cyan, Magenta, yellow, and black in the web running direction. It is arranged side by side along. The drying device 14 is for drying the water-based ink on the web printed by the printing device 13, and the cooling device 15 is an appropriate web for storing excessive heat after drying in the drying device 14. It cools to temperature. The web pass device 16 conveys a dried and cooled web, and the folding device 17 cuts the web after being vertically folded and folds it to a predetermined size to form a folded book. The paper discharge device 18 carries out the folded or folded book outside the apparatus.

  Accordingly, the roll-shaped web W is pulled out from the winding body by the paper feeding device 11 and is supplied to the printing device 13 by the infeed device 12, and in this printing device 13, the printing units 21, 22, 23, 24 Multi-color printing is performed, and the printed web W is dried with water-based ink by the drying device 14, cooled by the cooling device 15, and a folding book is created by the folding device 17 conveyed through the web pass device 16, It is carried out by the paper discharge device 18.

  Here, in the offset rotary printing press of this embodiment, each printing unit 21, 22, 23, 24 is a double-sided printing machine that simultaneously prints on the front and back surfaces of the web W, and uses the color of the water-based ink to be used ( The structure is almost the same except for the difference between indigo, red, yellow and black. Therefore, in the following description, only the structure which prints on the surface of the web W in one printing unit 21 is demonstrated.

  In the printing unit 21, as shown in FIG. 4, a blanket cylinder 31 is rotatably disposed above the conveyance path of the web W, and a plate cylinder 32 is rotatably disposed in contact with the blanket cylinder 31. Has been. An ink roller group 33 and an ink supply device 34 are disposed above the plate cylinder 32.

  The ink supply device 34 has a predetermined viscosity, that is, an ink fountain 35 serving as an ink storage part for storing water-based ink or water-soluble ink having a predetermined moisture content, and metering from the ink fountain 35 by an ink key (not shown). And an ink source roller 36 for supplying the used ink. The ink roller group 33 includes a delivery roller 37 that delivers ink from the ink source roller 36, a kneading roller 38 that kneads the ink delivered from the delivery roller 37, and the ink kneaded by the kneading roller 38 in the width direction. A reciprocating roller 39 that spreads, and an ink application roller 40 that supplies the ink transferred from the reciprocating roller 39 to the plate cylinder 32 are provided.

  In this case, the ink base roller 36, the kneading roller 38, and the ink application roller 40 are rubber rollers having elastic portions on their surfaces. On the other hand, the delivery roller 37 and the reciprocating roller 39 are metallic rollers. The plate cylinder 32 is a metal roller with a plate (not shown) mounted on the surface, and the blanket cylinder 31 is a rubber roller with a blanket as a resilient portion mounted on the surface. The ink base roller 36, the delivery roller 37, the kneading roller 38, the reciprocating roller 39, the ink application roller 40, the plate cylinder 32, and the blanket cylinder 31 are in contact with each other in series.

  Accordingly, the water-based ink whose supply amount is adjusted by the ink source roller 36 is supplied from the ink fountain 35 to the delivery roller 37 and is appropriately kneaded by passing through the kneading roller 38 and the reciprocating roller 39 to form a thin film. The ink is supplied to the printing roller 40, supplied to the plate surface of the plate cylinder 32 from the ink coating roller 40, the ink attached to the plate surface is transferred to the blanket cylinder 31, and a predetermined amount is applied to the web W between the blanket cylinder 41 for printing on the back side. By applying the printing pressure, the ink of the blanket cylinder 31 can be transferred to the surface of the web W as a pattern.

  The ink supply device 34 is provided with a water passage mechanism (not shown) for passing water to the reciprocating roller 39. By controlling the temperature of the surface of the reciprocating roller 39 by this water passage mechanism, the ink is supplied. Control water evaporation.

  As shown in FIGS. 1 and 2, the printing unit 21 in the offset rotary printing press of the present embodiment configured as described above has a uniform thickness on the outer peripheral surface of a cylindrical core material (iron core) 51. By attaching an elastic member (rubber member, for example, NBR-nitrile rubber, hardness 80 degrees) 52, the ink adhering roller 40 is configured, and the inner peripheral surface of the elastic member 52 is set against the outer peripheral surface of the core member 51. A non-contact gap 53 is provided.

  That is, the elastic member 52 has a cylindrical shape, and a plurality of columnar protrusions 54 having a predetermined thickness are formed on the inner peripheral surface, so that a gap 53 is formed between the columnar protrusions 54. Therefore, the gap 53 is provided on the inner peripheral surface of the elastic member 52 by a plurality of cylindrical projections 54 that are formed uniformly in the axial direction X and the circumferential direction Y, so that the inner surface of the core member 51 and the inner surface of the elastic member 52 are The peripheral surface comes into contact with a point (the tip of the cylindrical protrusion 54).

  Accordingly, as shown in FIG. 3, when a load F acts on the outer peripheral surface of the ink application roller 40 during the printing operation by the printing unit 21, the elastic member 52 undergoes volume deformation, thereby causing a core material 51 inside the elastic member 52. Heat generation part A occurs on the side. However, in the present embodiment, since the gap portion 53 exists on the inner peripheral surface of the elastic member 52, the heat of the heat generating portion A is absorbed by the core material 51 through the gap portions 53. Therefore, the elastic member 52 can suppress the temperature rise on the outer peripheral surface side, and can reduce the influence on the ink transferred to the outer peripheral surface.

  In the present embodiment, a plurality of cylindrical protrusions 54 having a predetermined thickness are formed on the inner peripheral surface of the elastic member 52, so that the gaps 53 are formed between the respective cylindrical protrusions 54. Is not limited to this shape.

  For example, as shown in FIG. 6A, a plurality of grooves formed in the inner circumferential surface of the elastic member 61 along the circumferential direction Y and arranged in parallel in the axial direction X may be formed as the gaps 62. In this case, the outer peripheral surface of the core member 51 and the inner peripheral surface of the elastic member 61 are in a line contact state.

  Further, as shown in FIG. 6B, the spiral groove portion formed along the spiral direction on the inner peripheral surface of the elastic member 71 and arranged in parallel in the axial direction X may be a gap portion 72. In this case, The outer peripheral surface of the core material 51 and the inner peripheral surface of the elastic member 71 are in a line contact state.

  As described above, in the ink application roller 40 according to the first embodiment, the elastic member 52 having a uniform thickness is attached to the outer peripheral surface of the cylindrical core material (iron core) 51. A gap 53 that is not in contact with the outer peripheral surface of the core material 51 is provided on the inner peripheral surface.

  Therefore, even if heat is generated when the elastic member 52 undergoes volume deformation, this heat is absorbed by the core material 51 through the gap portion 53 and is transferred to the outer peripheral surface while suppressing the temperature rise in the elastic member 52. Can reduce the effect on ink. Further, by suppressing the heat generation in the elastic member 52, the hardness of the elastic member 52 can be set high to improve the ink fillability, and as a result, the printing quality can be improved. Furthermore, it is not necessary to use a blanket or the like, and an increase in material cost can be suppressed.

  Further, in the ink application roller 40 of the first embodiment, the gap portion 53 is provided on the inner peripheral surface of the elastic member 52 so that the outer peripheral surface of the core material 51 and the inner peripheral surface of the elastic member 52 are in a point contact state. Therefore, the heat generated by the elastic member 52 is easily absorbed by the core material 51 through the gap 53, and the temperature rise in the elastic member 52 can be effectively suppressed.

  In the present embodiment, the gap 62 is formed in the inner circumferential surface of the elastic member 61 along the circumferential direction and is a plurality of grooves arranged in parallel in the axial direction, and the outer circumferential surface of the core member 51 and the elastic member 61 The inner peripheral surface may be in a line contact state. In this case, the core member 51 and the elastic member 61 are in contact with each other along a line along the circumferential direction, and deformation in the circumferential direction of the elastic member 61 can be suppressed to improve the print quality.

  Further, in the present embodiment, the gap portion 72 is formed in the inner peripheral surface of the elastic member 71 along the spiral direction and is a spiral groove portion arranged in parallel in the axial direction, so that the outer peripheral surface of the core material 51 and the inner surface of the elastic member 71 are The peripheral surface may be in a line contact state. In this case, the core member 51 and the elastic member 71 are in contact with each other along a line along the spiral direction, and the deformation in the circumferential direction and the axial direction of the elastic member 71 can be suppressed to improve the printing quality.

  In the printing machine of this embodiment, the ink fountain 35, the ink source roller 36, the delivery roller 37, the kneading roller 38, the reciprocating roller 39, the ink application roller 40, the plate cylinder 32, and the blanket cylinder 31 are connected in series. The ink adhering roller 40 is configured by mounting an elastic member 52 having a uniform thickness on the outer peripheral surface of a cylindrical core member 51, and the outer peripheral surface of the core member 51 is formed on the inner peripheral surface of the elastic member 52. A gap 53 that is not in contact with the surface is provided.

  Therefore, even if heat is generated when the elastic member 52 undergoes volume deformation, this heat is absorbed by the core material 51 through the gap portion 53 and is transferred to the outer peripheral surface while suppressing the temperature rise in the elastic member 52. Can reduce the effect on ink. Further, by suppressing the heat generation in the elastic member 52, the hardness of the elastic member 52 can be set high to improve the ink fillability, and as a result, the printing quality in the printing press can be improved. .

  FIG. 7 is a cross-sectional view of an essential part of an ink application roller as a printing roller according to Embodiment 2 of the present invention. In addition, the same code | symbol is attached | subjected to the member which has the same function as what was demonstrated in the Example mentioned above, and the overlapping description is abbreviate | omitted.

  In Example 2, as shown in FIG. 7, the ink application roller 80 includes an elastic member (rubber member, for example, NBR-nitrile rubber, uniform thickness) on the outer peripheral surface of a cylindrical core material (iron core) 81. (Hardness 80 degrees) 82a and 82b are mounted, and a gap portion 83 that is not in contact with the outer peripheral surface of the core 81 is provided on the inner peripheral surface of the elastic member 82b. Further, a high elastic layer (rubber member, for example, NBR-nitrile rubber, hardness 90 degrees) 85 having a hardness higher than the hardness of the elastic members 82a, 82b is provided at the intermediate portion in the thickness direction of the elastic members 82a, 82b. ing. In addition, the formation method of the space | gap part 83 may be any method of Example 1 mentioned above.

  Accordingly, when a load is applied to the outer peripheral surface of the ink application roller 80 during a printing operation, the elastic members 82a and 82b undergo volume deformation, and a heat generating portion is generated on the core 81 side inside the elastic members 82a and 82b. However, in the present embodiment, since the gap portion 83 exists on the inner peripheral surfaces of the elastic members 82a and 82b, the heat of the heat generating portion is absorbed by the core member 81 through the gap portions 83. Therefore, the elastic members 82a and 82b can suppress the temperature rise on the outer peripheral surface side, and can reduce the influence on the ink transferred to the outer peripheral surface.

  In this embodiment, since the highly elastic layer 85 is present in the thickness direction of the elastic members 82a and 82b, the elastic members 82a and 82b are prevented from being deformed in the circumferential direction or the axial direction of the ink application roller 80. The

  As described above, in the ink application roller 80 according to the second embodiment, the elastic members 82a and 82b having a uniform thickness are mounted on the outer peripheral surface of the cylindrical core material (iron core) 81. A gap 83 that is not in contact with the outer peripheral surface of the core 81 is provided on the inner peripheral surface of 82b, and a highly elastic layer 85 is provided between the elastic members 82a and 82b.

  Therefore, even if heat is generated when the elastic members 82a and 82b are deformed in volume, the heat is absorbed by the core member 81 through the gap 83, and the temperature rise in the elastic members 82a and 82b is suppressed and the outer periphery is suppressed. The influence on the ink transferred to the surface can be reduced. In addition, by suppressing the heat generation in the elastic members 82a and 82b, the hardness of the elastic members 82a and 82b can be set high to improve the ink deposition property, and as a result, the print quality can be improved. it can. Furthermore, it is not necessary to use a blanket or the like, and an increase in material cost can be suppressed.

  Further, in the ink application roller 80 of the present embodiment, a high elastic layer 85 having a hardness higher than the hardness of the elastic members 82a and 82b is provided between the elastic members 82a and 82b, and the circumferential direction of the elastic members 82a and 82b. In addition, printing quality can be improved by suppressing deformation in the axial direction.

  In each of the above-described embodiments, the printing roller according to the present invention has been described as the ink application roller 40. However, the present invention is not limited to this. For example, a rubber roller such as the ink source roller 36, the kneading roller 38, and the blanket cylinder 31 may be used. Can be applied.

  In each of the above-described embodiments, the printing press is configured by four printing units, but may be configured by one, two, or five or more. The printing unit is composed of an ink supply device, a group of ink rollers, a plate cylinder, and a blanket cylinder. However, the configuration and the number of the rollers and cylinders are not limited to those in the embodiment, and may be appropriately set to be optimal. That's fine. Furthermore, although the printing machine is a double-sided printing machine, it may be a single-sided printing machine, and can be applied not only to a rotary printing machine but also to a sheet-fed printing machine.

  The printing roller and the printing press according to the present invention suppress heat generation by providing a gap portion that is not in contact with the outer peripheral surface of the core material on the inner peripheral surface of the elastic member mounted on the outer peripheral surface of the core material. Thus, the printing quality can be improved and the increase in cost can be suppressed, and can be applied to any printing machine.

It is principal part sectional drawing of the ink form roller as a printing roller which concerns on Example 1 of this invention. FIG. 3 is a schematic diagram illustrating an inner peripheral surface of an elastic rubber in the ink application roller of Example 1. FIG. 5 is a schematic diagram illustrating an action at the time of elastic deformation in the ink forming roller of Example 1. FIG. 2 is a schematic configuration diagram illustrating a printing unit according to the first embodiment. 1 is a schematic configuration diagram illustrating a printing machine according to a first embodiment. 6 is a schematic diagram illustrating an inner peripheral surface of an elastic rubber in a modified example of the ink form roller of Embodiment 1. FIG. 6 is a schematic diagram illustrating an inner peripheral surface of an elastic rubber in a modified example of the ink form roller of Embodiment 1. FIG. It is principal part sectional drawing of the ink form roller as a printing roller which concerns on Example 2 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Paper feeder 12 Infeed apparatus 13 Printing apparatus 14 Drying apparatus 15 Cooling apparatus 16 Web pass apparatus 17 Folding apparatus 18 Paper discharge apparatus 21, 22, 23, 24 Printing unit 31, 41 Blanket cylinder 32 Plate cylinder 33 Ink roller group 34 Ink supply device 35 Ink fountain 36 Ink source roller 37 Delivery roller 38 Kneading roller 39 Reciprocating roller 40 Inking roller 51, 81 Core material 52, 61, 71, 82a, 82b Elastic member 53, 62, 72, 83 Gap

Claims (6)

  In a printing roller in which an elastic member having a uniform thickness is mounted on the outer peripheral surface of a cylindrical core material, a gap is formed on the inner peripheral surface of the elastic member so as not to contact the outer peripheral surface of the core material. A printing roller.   2. The printing according to claim 1, wherein the gap is provided on the inner peripheral surface of the elastic member, whereby the outer peripheral surface of the core member and the inner peripheral surface of the elastic member are in a point contact state. roller.   The gap is a plurality of grooves formed in the inner circumferential surface of the elastic member along the circumferential direction and arranged in parallel in the axial direction. The outer circumferential surface of the core member and the inner circumferential surface of the elastic member The printing roller according to claim 1, wherein is in a line contact state.   The void portion is a spiral groove portion formed along the spiral direction on the inner peripheral surface of the elastic member and arranged in parallel in the axial direction, and the outer peripheral surface of the core member and the inner peripheral surface of the elastic member are The printing roller according to claim 1, wherein the printing roller is in a line contact state.   5. The printing roller according to claim 1, wherein a high elastic layer having a hardness higher than that of the elastic member is provided in an intermediate portion in the thickness direction of the elastic member. An ink reservoir for storing ink;
An ink base roller for supplying ink in the ink reservoir,
A delivery roller for delivering ink from the ink source roller;
An ink application roller for supplying ink delivered from the delivery roller;
A plate cylinder on which the ink of the ink application roller is transferred to the image line portion;
A blanket cylinder for transferring the ink delivered to the plate cylinder to printing paper;
Is supported in series and rotatably.
The ink application roller is configured by mounting an elastic member having a uniform thickness on an outer peripheral surface of a cylindrical core material, and is not in contact with an outer peripheral surface of the core material on an inner peripheral surface of the elastic member. A gap is provided,
A printing machine characterized by that.

Images