JP2017149115A - Ink roller and printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve reduction in production cost and weight saving for an ink roller and a printer.SOLUTION: The ink roller has a metal electric-resistance weld pipe 11 having a seam 11a in part of circumferential direction, a rubber layer 12 formed on the outer peripheral surface of the electric-resistance weld pipe 11, and a pair of support shafts 13,14 fixed to both ends of the electric-resistance weld pipe 11 in axial direction.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an ink roller and a printing press for transferring ink in an offset rotary printing press that performs printing using a printing plate.

  For example, an offset rotary printing press for newspapers includes a paper feeding device, a printing device, a web pass device, and a folding machine. The printing apparatus includes a plurality of printing units, and each printing unit performs printing on a corresponding web. The printing unit includes an ink supply source, an ink supply device that supplies ink using a plurality of rollers, a plate cylinder on which a printing plate is mounted, and a flanket cylinder that transfers ink (image) to printing paper. Have.

  In the printing unit, the ink supply device includes a plurality of ink rollers having a rubber layer on the surface, and the ink roller is configured as a rubber roller in which rubber is wound around the surface of a metal cylindrical tube. An example of such an ink roller is described in Patent Document 1 below.

Japanese Patent Application Laid-Open No. 08-290551

  A thick steel pipe, which is a steel material, is used, and the inertial force is large because it is heavy but heavy. Therefore, it is necessary to grind the outer peripheral surface of the steel pipe to reduce the outer diameter. Further, since the ink roller is rotated at a high speed, the inner peripheral surface of the steel pipe needs to be unevenly machined, and a high-level processing technique is required. Therefore, the conventional ink roller has a problem that the manufacturing cost is increased and the handling property is not good because it is heavy.

  SUMMARY An advantage of some aspects of the invention is to provide an ink roller and a printing machine that reduce the manufacturing cost and reduce the weight.

  In order to achieve the above object, an ink roller according to the present invention includes a metal seamed tube having a seam part in a circumferential direction, an elastic layer formed on an outer peripheral surface of the seamed tube, and the seamed tube. And a pair of support shafts fixed to both ends in the axial direction.

  Therefore, by forming an ink layer by forming an elastic layer on the outer peripheral surface of a metal seamed tube having a seam, it is not necessary to process the outer peripheral surface and inner peripheral surface of the steel tube compared to the case where a steel tube is used. The manufacturing cost can be reduced, and the weight can be reduced by reducing the wall thickness.

  In the ink roller according to the present invention, the metal seamed tube is an electric sewing tube that is formed by rolling a metal plate having a constant thickness into a tubular shape and welding the end portions in the circumferential direction to form the joint portion. It is characterized by being.

  Therefore, cost reduction, weight reduction, and high precision can be achieved by using a metal seamed tube as an electric resistance tube.

  In the ink roller according to the present invention, the end portion of the seamed tube and the support shaft are joined at a contact portion excluding the joint portion by welding.

  Therefore, when welding the end portion of the seamed pipe and the support shaft, the seam can be prevented from being deformed by welding heat by welding except the seam of the seamed pipe.

  In the ink roller of the present invention, the thickness of the seamed tube is set to 4% or more and 8% or less of the inner diameter of the seamed tube, and the thickness of the seamed tube is 40% of the thickness of the elastic layer. It is the above and is set to 80% or less.

  Therefore, the thickness of the seamed tube is set to 4% or more and 8% or less of the diameter of the inner diameter of the seamed tube, the thickness of the ERW tube is set to 40% or more of the thickness of the rubber layer, and 80%. By setting it to% or less, the total weight and inertia can be reduced while ensuring the rigidity of the ERW pipe. In addition, the ink roller is less susceptible to thermal expansion due to friction during high-speed rotation of the ink roller, and the amount of thermal expansion is reduced, thereby reducing the driving force. In addition, since deformation due to the nip between the ink roller and other rollers is reduced, the ink is easily smoothed by the ink kneading operation.

  The ink roller according to the present invention is characterized in that the total length of the roller including the rubber winding portion and the shaft portion is set to 2000 mm or less and the weight is set to 50 kg or less.

  Therefore, sufficient rigidity for kneading the ink can be ensured, the weight can be reduced, and the assembling property and maintenance property of the ink roller can be improved.

  The printing machine of the present invention includes an ink supply device that has the ink roller and supplies ink, a plate cylinder that supplies ink from the ink supply device to a printing plate mounted on an outer peripheral portion, and the plate And a blanket cylinder for transferring an image of ink received from the cylinder onto the web.

  Therefore, by forming an ink layer by forming an elastic layer on the outer peripheral surface of the seamed tube and applying this ink roller to the roller of the ink supply device, it is possible to reduce the manufacturing cost of the ink supply device and The thickness can be reduced to reduce the weight. As a result, the manufacturing cost of the printing press can be reduced, and maintainability can be improved.

  According to the ink roller and the printing machine of the present invention, an ink layer is formed by forming an elastic layer on the outer peripheral surface of the seamed tube, so that the manufacturing cost can be reduced and the thickness is reduced and the weight is reduced. Can be achieved.

FIG. 1 is a cross-sectional view illustrating an ink roller according to the present embodiment. FIG. 2 is a cross-sectional view of FIG. 1II-II showing a cross section of the ink roller. FIG. 3 is a schematic diagram showing the dimensions of the ink roller. FIG. 4 is a schematic configuration diagram illustrating a newspaper offset rotary printing press. FIG. 5 is a schematic configuration diagram showing a printing unit in a newspaper offset rotary printing press. FIG. 6 is a schematic diagram illustrating a roller arrangement in the printing unit.

  Exemplary embodiments of an ink 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 embodiment, Moreover, when there exist several embodiment, what comprises combining each embodiment is also included.

  4 is a schematic configuration diagram illustrating a newspaper offset rotary printing press, FIG. 5 is a schematic configuration diagram illustrating a printing unit in the newspaper offset rotary printing press, and FIG. 6 is a schematic diagram illustrating a roller arrangement in the printing unit. .

  In this embodiment, as shown in FIG. 4, the printing press P includes a paper feeding device R, an infeed device I, a printing device U, a web pass device D, and a folding machine F. The paper feeding device R has a plurality (seven in this embodiment) of paper feeding units R1 to R7, and the infeed device I has a plurality (seven in this embodiment) of infeed units I1 to I7. The printing apparatus U has a plurality (6 in this embodiment) of printing units U1 to U6, and the web pass apparatus D has a plurality of (2 in the present embodiment) web pass units D1. , D2 and the folding machine F has a plurality of (two in this embodiment) folding units F1, F2.

  In this case, the printing units U1 to U6 are described as six units. However, each of the printing units U1 to U6 can perform four-color printing, and can be divided vertically into twelve two-color printing units U11 and U12. , U21... U61, U62. In addition, although the two folding units F1 and F2 are described above and below, actually, there are an operation side folding unit F1 and a driving side folding unit F2 that are arranged side by side in a direction orthogonal to the paper surface. Furthermore, although the printing apparatus U has been described from two parts, it has been described by dividing it into two in terms of function, and in reality, it is a single apparatus.

  In the paper feeding device R, the paper feeding units R1 to R7 have substantially the same configuration, and have a holding arm for holding three webs on which a web (print medium) W is wound in a roll shape. By rotating, the web can be rotated to the paper feeding position. Each of the paper feeding units R1 to R7 is provided with a paper splicing device (not shown), and when the remaining web fed out at the paper feeding position becomes small, the paper splicing device causes the paper web at the paper feeding position to be fed. Thus, the web at the standby position can be spliced.

  In the infeed apparatus I, the infeed units I1 to I7 have substantially the same configuration, and the web traveling through the printing apparatus U is adjusted by adjusting the tension of the web W fed to the printing units U1 to U6 of the printing apparatus U. The tension of W is stably maintained at an appropriate value. For example, each of the infeed units I1 to I7 includes an infeed roller, a paper pressing rubber roller, a dancer roller, a guide roller, and the like. Then, the tension of the web W is made appropriate by urging the dancer roller in the tensioning direction of the web W, the peripheral speed of the infeed roller is changed according to the swing of the dancer roller, and the proper tension of the web W is maintained. ing.

  In the printing apparatus U, the printing units U1 to U6 are multicolor printing units capable of performing double-sided four-color printing. However, each printing unit U1-U6 can be made into the printing units U11-U62 which can perform double-sided two-color printing by dividing | segmenting up and down. Each of the printing units U11 to U62 has substantially the same configuration and has an ink supply device, a plate cylinder, a blanket cylinder, and the like, which will be described later.

  In the web pass apparatus D, the web pass unit D1 is provided for the printing units U1 to U3, and the web pass unit D2 is provided for the printing units U4 to U6. Each of the web path units D1 and D2 has substantially the same configuration, and is a slitter that cuts the web W along the longitudinal direction (the longitudinal direction of the web W, the conveyance direction of the web W) at the center in the width direction, and the longitudinal cut. A turn bar for setting the transport path of the web W, and a compensator for adjusting the transport position of the web W in the vertical direction.

  That is, the webs W printed by the printing units U1 to U3 are vertically cut by the slitter in the web pass unit D1, changed by the turn bar, changed by the turn bar, and adjusted by the compensator. Are overlaid in order. Each of the webs W printed by the printing units U4 to U6 is vertically cut by a slitter in the web pass unit D2, is changed by a turn bar, a transfer path is changed, and a transfer position is adjusted by a compensator. They are stacked in order.

  In the folding machine F, the two folding units F1 and F2 are arranged on the operation side and the drive side. That is, when a plurality of webs W1 are overlapped and introduced from the web pass unit D1, the folding unit F1 vertically folds the web W1, cuts it horizontally by a predetermined length, and folds it to form a fold. The paper can be discharged as a newspaper. In addition, when a plurality of webs W2 are overlapped and introduced from the web pass unit D2, the folding unit F2 vertically folds the web W2, cuts the web W2 by a predetermined length, and then horizontally folds to form a fold. The paper can be discharged as a newspaper.

  Here, the printing unit U1 in the printing apparatus U will be described in detail. The other printing units U2 to U6 have substantially the same configuration.

  As shown in FIG. 5, the printing unit U1 is an H-type tower unit so that four-color printing is possible. In the printing unit U1, the conveyance direction of the web W is upward in the vertical direction. From the bottom to the top, 4 for each of black, cyan, magenta, and yellow. Two stacks 21, 22, 23, and 24 are arranged. Each of the stacks 21, 22, 23, and 24 has a roller arrangement that is bilaterally symmetrical.

  Each stack 21, 22, 23, 24 can be opposed to the blanket cylinders 31 a, 31 b, 32 a, 32 b, 33 a, 33 b, 34 a, 34 b across the conveyance path of the web W. Plate cylinders 41a, 41b, 42a, 42b, 43a, 43b, 44a, 44b are in contact with the cylinders 31a, 31b, 32a, 32b, 33a, 33b, 34a, 34b. The stacks 21, 22, 23, and 24 are respectively connected to the plate cylinders 41a, 41b, 42a, 42b, 43a, 43b, 44a, and 44b with ink supply devices 51a, 51b, 52a, 52b, 53a, 53b, 54a and 54b are provided. Further, dampening devices 61a, 61b, 62a, 62b, 63a, 63b, 64a, 64b are provided for the plate cylinders 41a, 41b, 42a, 42b, 43a, 43b, 44a, 44b.

  In this case, in the stacks 21 and 23, the blanket cylinders 31a, 31b, 33a and 33b and the plate cylinders 41a, 41b, 43a and 43b are arranged in a letter C shape, and the stacks 22 and 24 are in the blanket cylinders 32a, 32b and 34a. , 34b and plate cylinders 42a, 42b, 44a, 44b are arranged in an inverted C shape. In each plate cylinder 41a, 41b, 42a, 42b, 43a, 43b, 44a, 44b, a printing plate (not shown) that prints a different pattern on the outer peripheral surface is along the axial direction, that is, the width direction of the web W. Can be installed side by side.

  Here, as shown in FIG. 6, the stack 24 arranged on the uppermost side is a surface printing unit that performs surface printing on the left side with respect to the conveyance path of the web W in the vertical direction, The right side is a back surface printing unit that performs back surface printing.

  The stack 24 includes blanket cylinders 34a and 34b, plate cylinders 44a and 44b, ink supply devices 54a and 54b, and dampening devices 64a and 64b. The ink supply devices 54a and 54b are of a digital ink pump system, and include ink base rollers 71a and 71b, ink pumps 72a and 72b, ink delivery rollers 73a and 73b, ink kneading rollers 74a and 74b, and ink reciprocation. It comprises rollers 75a and 75b, ink kneading rollers 76a and 76b, ink reciprocating rollers 77a and 77b, and two ink applying rollers 78a, 78b, 79a and 79b. Further, the dampening devices 64a and 64b are of a spray type and include water rider rollers 81a and 81b, water reciprocating rollers 82a and 82b, swimsuit rollers 83a and 83b, and spray nozzles 84a and 84b. The ink supply devices 54a and 54b may be an ink fountain type.

  The ink delivery rollers 73a and 73b deliver ink from the ink source rollers 71a and 71b. The surfaces of the ink delivery rollers 73a and 71b are made of metal or resin and face the ink source rollers 71a and 71b with a predetermined amount of gap. The frame is rotatably supported by the frame. The ink kneading rollers 74a and 74b knead the ink delivered from the ink delivery rollers 73a and 73b. The surface of the ink kneading rollers 74a and 74b is formed of rubber and is rotatable on the frame so as to be in contact with the ink delivery rollers 73a and 73b. It is supported. The ink reciprocating rollers 75a and 75b spread the ink kneaded by the ink kneading rollers 74a and 74b in the width direction, the surface is formed of metal, and the frame rotates so as to contact the ink kneading rollers 74a and 74b. It is supported freely and can reciprocate in the axial direction.

  The ink kneading rollers 76a and 76b knead the ink delivered from the ink reciprocating rollers 75a and 75b, and the surface thereof is formed of rubber, and is rotatable to the frame so as to be in contact with the ink reciprocating rollers 75a and 75b. It is supported by. The ink reciprocating rollers 77a and 77b spread the ink kneaded by the ink kneading rollers 76a and 76b in the width direction, and the frame is formed so as to be in contact with the ink kneading rollers 76a and 76b. And can be reciprocated in the axial direction.

  The ink adhering rollers 78a, 78b, 79a, 79b receive and supply ink spread in the width direction by the ink reciprocating rollers 77a, 77b, and the surfaces thereof are formed of rubber, and are supplied to the ink reciprocating rollers 77a, 77b. It is rotatably supported by the frame so as to make contact. The ink delivery rollers 73a and 73b and the ink reciprocating rollers 75a, 75b, 77a and 77b are connected to be synchronously driven by a gear (not shown) and can be driven and rotated by a driving device (not shown). Further, the ink kneading rollers 74a and 74b and the ink application rollers 78a, 78b, 79a, and 79b can be rotated by rotation transmission by frictional contact with each of the driving and rotating rollers.

  Further, the water rider rollers 81a and 81b knead dampening water delivered between the rollers. The surface is formed of rubber and is rotatably supported by the frame so as to be in contact with adjacent rollers. Further, the water reciprocating rollers 82a and 82b spread dampening water passed between adjacent rollers in the width direction, and the surface is formed of metal and can freely rotate on the frame so as to contact the adjacent rollers. And can be reciprocated in the axial direction. The swimsuit rollers 83a and 83b receive and supply the fountain solution spread in the width direction by the water reciprocating rollers 82a and 82b, and have a surface formed of rubber so as to come into contact with the water reciprocating rollers 82a and 82b. The frame is rotatably supported by the frame. A plurality of spray nozzles 84a, 84b are arranged along the width direction with respect to the water reciprocating rollers 82a, 82b. At this time, the dampening water can be supplied only to a predetermined region in the axial direction of the water reciprocating rollers 82a and 82b by operating any one of the plurality of spray nozzles 84a and 84b. The water reciprocating rollers 82a and 82b are coupled so as to be synchronously driven by a gear together with the ink reciprocating rollers 75a, 75b, 77a and 77b, and can be driven and rotated. Further, the water rider rollers 81a and 81b and the swimsuit rollers 83a and 83b can be rotated by rotational transmission by frictional contact with each of the rollers that are driven to rotate.

  The plate cylinders 44a and 44b are metal rollers around which the printing plate is wound. After the fountain solution of the bathing rollers 83a and 83b is transferred to the non-image area of the printing plate, the ink forming rollers 78a and 78b, The inks 79a and 79b are transferred to the image line portion of the printing plate. The plate cylinders 44a and 44b are rotatably supported by the frame so as to be in contact with the ink applying rollers 78a, 78b, 79a and 79b and the bathing rollers 83a and 83b. The blanket cylinders 34a and 34b are rubber rollers around which blankets (rubber) (not shown) are wound. The blanket cylinders 34a and 34b transfer the ink transferred from the plate cylinders 44a and 44b to the web W, and are applied to the plate cylinders 44a and 44b. It is rotatably supported by the frame so as to make contact. The plate cylinders 44a and 44b and the blanket cylinders 34a and 34b are coupled so as to be synchronously driven by a gear (not shown), and can be driven and rotated by a driving device.

  In this case, the printing plates to be mounted on the plate cylinders 44a and 44b are formed with an area with a pattern (image area) and an area without an image (non-image area), the image area is lipophilic, The image area is hydrophilic. Therefore, when ink is supplied from the ink application rollers 78a, 78b, 79a, 79b to the printing plates mounted on the plate cylinders 44a, 44b after the dampening water is supplied from the swim application rollers 83a, 83b, Ink is transferred only to the image area, and dampening water is transferred to the non-image area. When the blanket cylinders 34a and 34b are in contact with the plate cylinders 44a and 44b and synchronously rotate, the ink in the image line portion is transferred from the plate cylinders 44a and 44b to the blanket cylinders 34a and 34b.

  Although only the stack 24 has been described, the other stacks 21, 22, and 23 have substantially the same configuration.

  The ink roller of this embodiment is applied to, for example, the blanket cylinders 34a and 34b, the ink kneading rollers 74a and 74b, the ink kneading rollers 76a and 76b, and the ink kneading rollers 78a, 78b, 79a, and 79b used in the stack 24. can do.

  FIG. 1 is a cross-sectional view showing an ink roller of the present embodiment, and FIG. 2 is a cross-sectional view of FIG. 1II-II showing a cross section of the ink roller.

  As shown in FIGS. 1 and 2, the ink roller 10 includes an electric sewing tube 11 as a metal seamed tube, a rubber layer 12 as an elastic layer, and a pair of support shafts 13 and 14.

  The electric sewing tube 11 is a seamed tube in which a seam portion 11a along the axial direction is formed by rounding and processing a metal plate having a constant thickness into a tubular shape and welding and joining the end portions in the circumferential direction. is there. As the metal plate, a steel plate or an aluminum plate is used. The rubber layer 12 is provided in close contact with the outer peripheral surface of the electric sewing tube 11, and the axial length is set to be shorter than that of the electric sewing tube 11. The electric welding tube 11 is connected to each end in the axial direction. The outer peripheral surface of the part is exposed.

  Each of the support shafts 13 and 14 has large-diameter boss portions 13a and 14a and small-diameter shaft portions 13b and 14b. The boss portions 13a and 14a and the small-diameter shaft portions 13b and 14b are integrally formed. . The boss portions 13 a and 14 a are set so that the outer diameter is slightly smaller than the inner diameter of the electric sewing tube 11. The support shafts 13 and 14 have large-diameter boss portions 13a and 14a fitted into the shaft end portions of the electric sewing tube 11, and the shaft ends at the outer peripheral portions of the boss portions 13a and 14a The shaft end in the peripheral portion is fixed by welding W1 and W2. At this time, the contact part except the joint part 11a is joined to the electric sewing pipe 11 and the boss parts 13a and 14a of the support shafts 13 and 14 by welding. In addition, the support shafts 13 and 14 are formed with through holes 13c and 14c along the axial direction at positions shifted in the radial direction from the center O, so that deformation due to thermal expansion during welding with the ERW pipe 11 is prevented. The The support shafts 13 and 14 have shaft portions 13b and 14b rotatably supported on the frames 17 and 18 of the printing press via bearings 15 and 16, respectively.

  FIG. 3 is a schematic diagram showing the dimensions of the ink roller.

  In the in-roller 10, as shown in FIG. 3, the thickness T1 of the electric sewing tube 11 is set to be 4% or more and 8% or less of the inner diameter D of the electric sewing tube 11, that is, the diameter of the hollow portion. ing. In the ink roller 10, the thickness T1 of the electric sewing tube 11 is set to 40% or more and 80% or less of the thickness T2 of the rubber layer 12. In this case, the outer diameter of the ink roller 10 is, for example, around 120 mm, the thickness T1 of the electric sewing tube 11 is in the range of 3.5 mm to 7 mm, and the thickness of the rubber layer T2 is in the range of 7 mm to 12 mm. The inner diameter (the diameter of the cavity) D of the electric sewing tube 11 is ideally in the range of 82 mm to 99 mm.

  The thickness T1 of the ERW tube 11 is set to 4% or more and 8% or less of the diameter of the inner diameter D of the ERW tube 11, and the thickness T1 of the ERW tube 11 is set to the thickness T2 of the rubber layer 12. By setting it to 40% or more and 80% or less, the total weight and inertia can be reduced while ensuring the rigidity of the ERW tube 11. Further, the ink roller 10 is less susceptible to thermal expansion due to friction during high-speed rotation, and the amount of thermal expansion can be reduced to reduce the driving force. Further, since deformation due to the nip between the ink roller 10 and other rollers is reduced, the ink is easily smoothed by the ink kneading operation.

  In this case, the thickness T1 of the electric sewing tube 11 and the thickness T2 of the rubber layer 12 are set to appropriate values without changing the outer diameter of the ink roller 10 conventionally. Conventional ink rollers have been reduced in weight by reducing the outer diameter of the metal layer (iron) and reducing the thickness to a thickness that allows uneven thickness machining. There was a limit, and it was heavy. Moreover, since the difference between the outer diameter of the ink roller and the outer diameter of the metal layer (iron) was adjusted by increasing the thickness of the rubber layer, a large amount of rubber was required for rewinding.

  Some ink rollers use a carbon material for the metal layer (element tube). However, in the case of a carbon material, it is very expensive and often has a large diameter in order to obtain the same rigidity as a steel material. Also, when rewinding rubber, the carbon surface becomes fuzzy when scraping the rubber, the rubber does not come off well, the carbon itself is shaved, the diameter changes, and in some cases a non-reusable malfunction occurs. There was also. In addition, the bonded portion of carbon and iron may be damaged by heat at the time of rubber rewinding, and there has been a limit on the number of times of rubber rewinding rework. For this reason, those using a carbon material have a limit for repeated processing and tend to have a short roller life.

  Further, the total length of the roller in the axial direction including the rubber winding portion and the shaft portion is set to a range of 2000 mm or less. The axial length in this case is the length including the support shafts 13 and 14. In the newspaper offset rotary printing press of this embodiment, the lower limit of the total roller length of the ink roller 10 is 1200 mm, but it can be changed depending on the length in the width direction of the printing plate and the number of loadings in the width direction of the printing plate. is there. The ink roller 10 is set to have a weight of 50 kg or less. In this case, it is preferable that the weight is 45 kg or less and the weight is 40 kg or less. The regulations regarding the weight of the ink roller 10 are according to EN 1005-2 “Safety of machinery-Human physical performance Part 2: Manual handling of machinery and component parts of machinery” in Europe. In Japan, it is based on the “Rules for Women Labor Standards and the Rules for Labor Standards for Young People”.

  As described above, in the ink roller of the present embodiment, the metal electric sewing tube 11 having the seam portion 11a in a part in the circumferential direction, the rubber layer 12 formed on the outer peripheral surface of the electric sewing tube 11, A pair of support shafts 13 and 14 are provided that are fixed to both ends of the electric sewing tube 11 in the axial direction.

  Therefore, by forming the rubber layer 12 on the outer peripheral surface of the electric sewing tube 11 having the joint portion 11a and configuring the ink roller 10, the processing of the outer peripheral surface and the inner peripheral surface of the steel pipe is performed as compared with the case where the steel pipe is used. The manufacturing cost can be reduced, and the thickness can be reduced by reducing the thickness.

  In the ink roller according to the present embodiment, a metal plate having a constant thickness is rounded and processed into a tubular shape, and the end portions in the circumferential direction are welded to form the seam portion 11a. Therefore, the use of the electric sewing tube 11 can achieve cost reduction, weight reduction, and high accuracy.

  In the ink roller of the present embodiment, the end portion of the electric sewing tube 11 and the support shafts 13 and 14 are joined by welding at a contact portion excluding the joint portion 11a. Therefore, when welding the end portion of the ERW tube 11 and the support shafts 13 and 14, by welding except for the seam portion 11 a of the ERW tube 11, deformation of the seam portion 11 a due to welding heat can be prevented. it can.

  In the ink roller of the present embodiment, the thickness T1 of the electric sewing tube 11 is set to be larger than 4% and smaller than 8% of the inner diameter D of the electric sewing tube 11, and the thickness T1 of the electric sewing tube 11 is set to the rubber layer 12. The thickness T2 is set to be larger than 50% and smaller than 75%. Accordingly, the total weight can be reduced while ensuring the rigidity of the ERW tube 11 and the thickness T1 of the ERW tube 11 is thinner than the thickness T2 of the rubber layer 12, so that the ink roller 10 It becomes difficult to be affected by thermal expansion due to friction during high-speed rotation, and the amount of thermal expansion can be reduced to reduce driving force.

  In the ink roller according to the present embodiment, the total length of the roller including the rubber winding portion and the shaft portion is set to a range of 2000 mm or less, and the weight is set to 50 kg or less. In addition to ensuring sufficient rigidity to knead the ink, it is possible to reduce the weight and improve the assembling property and maintenance property of the ink roller 10.

  Further, in the printing machine of the present embodiment, the ink supply devices 51a, 51b, 52a, 52b, 53a, 53b, 54a, 54b that have the ink roller 10 and supply ink, and the ink supply devices 51a, 51b. , 52a, 52b, 53a, 53b, 54a, 54b, plate cylinders 41a, 41b, 42a, 42b, 43a, 43b, 44a, 44b, and plate cylinders 41a, 41a, 41b, to which ink is supplied to the printing plates mounted on the outer periphery. Blanket cylinders 31 a, 31 b, 32 a, 32 b, 33 a, 33 b, 34 a, 34 b for transferring ink images received from 41 b, 42 a, 42 b, 43 a, 43 b, 44 a, 44 b to the web W are provided.

  Accordingly, the rubber layer 12 is formed on the outer peripheral surface of the electric sewing tube 11 to constitute the ink roller 10, and this ink roller 10 is used as a roller of the ink supply devices 51a, 51b, 52a, 52b, 53a, 53b, 54a, 54b. By applying, it is possible to reduce the manufacturing cost of the ink supply devices 51a, 51b, 52a, 52b, 53a, 53b, 54a, 54b, and to reduce the thickness and reduce the weight. As a result, the manufacturing cost of the printing press can be reduced, and maintainability can be improved.

  In the above-described embodiment, the newspaper offset rotary printing press P is applied as the printing press. However, it may be applied to a commercial offset rotary printing press or an offset sheet-fed printing press. Further, the ink roller 10 is made up of a blanket cylinder 31a, 31b, 32a, 32b, 33a, 33b, 34a, 34b, an ink kneading roller 74a, 74b, an ink kneading roller 76a, 76b, an ink kneading roller 78a, 78b, 79a, 79b. However, another ink roller having an elastic layer may be used.

P Newspaper web offset press (printer)
R paper feeding device R1 to R7 paper feeding unit I infeed device I1 to I7 infeed unit U printing device U1 to U6, U11 to U62 printing unit D web pass device D1, D2 web pass unit F folding machine F1, F2 folding unit 10 Ink roller 11 ERW pipe (Seamed pipe)
11a Joint part 12 Rubber layer (elastic layer)
13, 14 Support shaft 21, 22, 23, 24 Stack 31a, 31b, 32a, 32b, 33a, 33b, 34a, 34b Blanket cylinder 41a, 41b, 42a, 42b, 43a, 43b, 44a, 44b Plate cylinder 51a, 51b , 52a, 52b, 53a, 53b, 54a, 54b Ink supply devices 61a, 61b, 62a, 62b, 63a, 63b, 64a, 64b Wetting devices 74a, 74b Ink kneading rollers 76a, 76b Ink kneading rollers 78a, 78b, 79a, 79b Ink roller W web

Claims (6)

A metal seamed pipe having a seam part in a circumferential part;
An elastic layer formed on the outer peripheral surface of the seamed tube;
A pair of support shafts fixed to both axial ends of the seamed tube;
An ink roller comprising:   The metal seamed pipe is an electric resistance welded pipe formed by rounding and processing a metal plate having a constant thickness into a tubular shape and welding the end portions in the circumferential direction to form the joint portion. Item 2. The ink roller according to Item 1.   The ink roller according to claim 1, wherein the end portion of the seamed pipe and the support shaft are joined by welding at a contact portion except for the joint portion.   The thickness of the seamed tube is set to 4% or more and 8% or less of the inner diameter of the seamed tube, and the thickness of the seamed tube is set to 40% or more and 80% or less of the thickness of the elastic layer. The ink roller according to claim 1, wherein the ink roller is set.   The total roller length in the axial direction including the rubber winding portion and the shaft portion is set in a range of 2000 mm or less and the weight is set to 50 kg or less. 5. Ink roller. An ink supply device that has the ink roller according to any one of claims 1 to 5 and supplies ink,
A plate cylinder from which ink is supplied to the printing plate mounted on the outer periphery from the ink supply device;
A blanket cylinder for transferring an image of ink received from the plate cylinder to a web;
A printing machine comprising:

Images