JP6110001B1 - Ink supply apparatus and method, ink supply amount control apparatus, printing machine - Google Patents

Abstract

In an ink supply apparatus and method, an ink supply amount control apparatus, and a printing machine, printing quality is improved by maintaining a constant printing density. A calculation unit 102 of a control device 101 sets an ink supply amount according to a printing speed, adjusts the ink supply amount set according to the printing speed according to the number of printing copies, and a control unit 103 opens an ink key. Control the degree and rotation speed of the ink base roller. [Selection] Figure 1

Description

  The present invention relates to an ink supply device and method for supplying ink to a printing plate, an ink supply amount control device, and a printing press including an ink supply device 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 according to multicolor printing, and each printing unit performs color printing on a corresponding web. The printing unit includes an ink supply device that supplies ink using a plurality of rollers, a plate cylinder on which a printing plate is mounted, and a blanket cylinder that transfers ink (image) to printing paper.

  The ink supply device can adjust the ink supply amount by the gap amount (ink key opening degree) of the ink key with respect to the ink base roller, and can adjust the ink supply amount by the rotation speed of the ink base roller. The ink supply device has a plurality of ink keys arranged along the print width direction (paper width direction), and can adjust the ink supply amount in units of a plurality of ink areas partitioned in the width direction of the printing paper. . Therefore, the operator adjusts each ink key opening in consideration of the pattern area ratio (drawing rate) and the rotation speed of the ink base roller, and the ink whose supply amount is adjusted by each ink key opening is the ink roller The ink supplied to the plate surface of the plate cylinder through the group is transferred to the printing paper as a pattern through the blanket cylinder.

  As such an ink supply apparatus, there is one described in Patent Document 1 below.

Japanese Patent No. 4202342

  As described above, the printing unit can adjust the ink supply amount not only by adjusting the ink key opening but also by adjusting the rotation speed of the ink base roller. However, when the printing speed is increased, the ink supply amount to the printing paper is lowered and the density is lowered. Therefore, it is necessary to set the rotation number of the ink base roller according to the printing speed. In general, the printing unit has a function (ink speed function) that defines the relationship between the printing speed and the rotation speed of the ink fountain roller, and the rotation of the ink fountain roller with respect to the printing speed using this ink speed function. The number is set.

  However, even if the ink key opening is set according to the line rate of the pattern to be printed and the rotation speed of the ink source roller is set according to the printing speed, if the printing conditions change after printing starts, the print density May change. For example, when the printing press operates, the roller temperature rises due to the frictional heat of the roller, the ink temperature and the dampening water temperature rise, and the emulsification characteristics and transfer characteristics of the ink and dampening water fluctuate. Further, when the roller temperature rises, the nip pressure between the rollers changes. Furthermore, when printing is started, foreign matters such as ink and paper dust accumulate on each roller, plate cylinder, and blanket cylinder. As a result, the print density fluctuates and the print quality deteriorates.

  SUMMARY OF THE INVENTION An object of the present invention is to solve the above-described problems, and to provide an ink supply device and method, an ink supply amount control device, and a printing machine that maintain a constant print density and improve print quality. .

  The ink supply device of the present invention for achieving the above object is an ink supply device that sets an ink supply amount according to a printing speed, and adjusts the ink supply amount set according to the printing speed according to the number of printing copies. It is characterized by that.

  Therefore, the ink supply amount is set according to the printing speed, and the set ink supply amount is adjusted according to the number of print copies. The increase / decrease is suppressed, and the printing quality can be improved by maintaining the printing density constant.

  The ink supply device of the present invention is characterized in that the ink supply amount is increased over a predetermined period from the start of printing to a predetermined number of printed copies.

  Therefore, by increasing the ink supply amount from the start of printing to a predetermined number of copies, the decrease in print density due to the roller temperature rising from the start of printing and the emulsification of ink can be suppressed, and the print density can be kept constant. it can.

  The ink supply apparatus of the present invention is characterized in that the ink supply amount is gradually increased from the start of printing to the predetermined number of printed copies.

  Therefore, by gradually increasing the ink supply amount from the start of printing to a predetermined number of copies, the print density can be kept constant by finely controlling the ink supply amount with respect to the print density that fluctuates every moment. .

  The ink supply apparatus of the present invention is characterized in that the ink supply amount is increased stepwise from the start of printing to the predetermined number of copies.

  Therefore, it is possible to simplify the control by increasing the ink supply amount stepwise from the start of printing to a predetermined number of copies.

  The ink supply apparatus of the present invention is provided with an ink speed function that defines the relationship between the printing speed and the ink supply amount, and an ink number function that defines the relationship between the number of copies to be printed and the ink supply adjustment amount. The ink supply amount is set by using the ink, and the ink supply amount is adjusted by using an ink copy number function.

  Accordingly, it is sufficient to set the ink speed function and the ink copy number function in advance, the ink supply amount can be easily set by simple control, and the control can be simplified.

  In the ink supply apparatus of the present invention, the ink copy number function can be adjusted according to a printing pattern.

  Therefore, by making the ink copy number function adjustable according to the print pattern, it is possible to set the ink supply amount according to the print pattern.

  In the ink supply apparatus of the present invention, a plurality of the ink copy number functions are set according to different printing patterns and can be selectively used.

  Therefore, by setting a plurality of ink copy functions according to different print patterns and making them selectively usable, it is not necessary to adjust the ink copy functions, and the ink supply amount corresponding to the print pattern can be easily set. be able to.

  In the ink supply apparatus of the present invention, the ink copy number function can be adjusted according to different printing conditions.

  Therefore, by making it possible to adjust the ink copy number function according to the printing conditions, it is possible to set the ink supply amount in accordance with the printing conditions.

  In the ink supply device of the present invention, a storage unit for storing the ink copy number function is provided, and the ink copy function stored in the storage unit can be changed according to an adjustment amount of the ink copy function. It is a feature.

  Therefore, by changing the ink number function stored in the storage unit according to the adjustment amount of the ink number function, the ink number function in the storage unit can be updated as needed.

  In the ink supply device of the present invention, a storage unit that stores the ink copy number function and a print state detection unit that detects a print state are provided, and the storage unit stores the print state according to the print state detected by the print state detection unit. The stored ink copy number function can be changed.

  Therefore, for example, by changing the ink copy number function stored in the storage unit according to the automatically detected print density as the printing state, the ink copy number function in the storage unit is updated according to the print density as needed. Can be.

  In the ink supply apparatus of the present invention, a storage unit for storing the ink copy number function and an ink concentration detection unit for detecting the ink density are provided, and the storage unit stores the ink density according to the ink density detected by the ink concentration detection unit. The stored ink copy number function can be changed.

  Therefore, for example, by changing the ink part function stored in the storage part according to the automatically detected water content in the ink as the ink density, the ink part function in the storage part can be changed according to the water content in the ink at any time. Can be up to date.

  In the ink supply apparatus of the present invention, an ink supply source, an ink original roller that supplies ink delivered from the ink supply source, and a plurality of ink conveyances that convey the ink supplied from the ink original roller to a plate cylinder It is characterized by comprising a roller and a control device for adjusting the ink supply amount by controlling the number of rotations of the ink source roller in accordance with the number of copies to be printed.

  Therefore, the ink supply amount in the width direction of the printing paper can be controlled simply by increasing or decreasing the rotation number of the ink source roller by adjusting the ink supply amount by controlling the rotation speed of the ink source roller according to the number of copies to be printed. Can be adjusted uniformly.

  The ink supply method of the present invention includes an ink supply amount setting step for setting an ink supply amount according to a printing speed, and an ink supply amount for adjusting the ink supply amount set according to the printing speed according to the number of copies. It has an adjustment step and an ink supply step of supplying an ink supply amount adjusted according to the number of copies to the plate cylinder.

  Therefore, even if the printing conditions fluctuate when the number of printed copies increases, the increase or decrease in the printing density is suppressed, and the printing quality can be improved by maintaining the printing density constant.

  The ink supply amount control device of the present invention is characterized in that the ink supply amount is set according to the printing speed, and the ink supply amount set according to the printing speed is adjusted according to the number of copies to be printed. It is.

  Therefore, even if the printing conditions fluctuate when the number of printed copies increases, the increase or decrease in the printing density is suppressed, and the printing quality can be improved by maintaining the printing density constant.

  Further, the printing machine of the present invention includes the ink supply device, a plate cylinder in which ink is supplied from the ink supply device to a printing plate mounted on an outer peripheral portion, and an image of the ink received from the plate cylinder on a web. And a blanket cylinder to be transferred.

  Therefore, the ink supply amount is set according to the printing speed, and the set ink supply amount is adjusted according to the number of print copies. The increase / decrease is suppressed, and the printing quality can be improved by maintaining the printing density constant.

  According to the ink supply device and method, the ink supply amount control device, and the printing machine of the present invention, the ink supply amount is set according to the printing speed, and the ink supply amount set according to the printing speed is set according to the number of copies. Since the adjustment is performed, the print density can be kept constant and the print quality can be improved.

FIG. 1 is a schematic configuration diagram illustrating an ink supply apparatus according to the present embodiment. FIG. 2 is a graph showing a printing speed function map. FIG. 3 is a graph showing a print function map. FIG. 4 is a graph showing another print copy number function map. FIG. 5 is a schematic configuration diagram showing a newspaper offset rotary printing press. FIG. 6 is a schematic configuration diagram showing a printing unit in a newspaper offset rotary printing press. FIG. 7 is a schematic diagram illustrating a roller arrangement in the printing unit.

  Exemplary embodiments of an ink supply apparatus and method, an ink supply amount control apparatus, 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.

  First, the configuration of the newspaper offset rotary printing press of this embodiment will be briefly described. FIG. 5 is a schematic configuration diagram illustrating a newspaper offset rotary printing press according to the present embodiment, FIG. 6 is a schematic configuration diagram illustrating a printing unit in the newspaper offset rotary printing press, and FIG. 7 is a roller arrangement in the printing unit. FIG.

  In this embodiment, as shown in FIG. 5, a newspaper offset rotary printing press (hereinafter simply referred to as a printing press) P includes a paper feeding device R, an infeed device I, a printing device U, and a web path. The apparatus D and the folding machine F are comprised. The paper feeding device R has a plurality (five in this embodiment) of paper feeding units R1, R2, R3, R4, and R5, and the infeed device I has a plurality (five in this embodiment). The infeed units I1, I2, I3, I4, and I5 are included, and the printing apparatus U includes a plurality of (in this embodiment, five) printing units U1, U2, U3, U4, and U5, and a web pass apparatus. D has one web pass unit D1, and the folding machine F has two folding units F1 and F2. The number of paper feeding units R1, R2, R3, R4, R5, infeed units I1, I2, I3, I4, I5 and printing units U1, U2, U3, U4, U5 is limited to five. Instead, the web pass unit D1 and the folding units F1 and F2 may be plural.

  In the paper feeding device R, the paper feeding units R1, R2, R3, R4, and R5 have substantially the same configuration, and have a holding arm that holds three webs on which a web (winding paper) W is wound in a roll shape. By rotating the holding arm, the web can be rotated to the paper feeding position. Each of the paper feeding units R1 to R5 has a paper splicing device (not shown), and when the 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 removed. The web at the standby position can be spliced.

  In the infeed apparatus I, the infeed units I1, I2, I3, I4, and I5 have substantially the same configuration, and the tension of the web W that is fed into each of the printing units U1, U2, U3, U4, and U5 of the printing apparatus U is set. By adjusting the tension, the tension of the web W running on the printing apparatus U is stably maintained at an appropriate value. For example, each infeed unit I1, I2, I3, I4, and I5 includes an infeed 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, U2, U3, U4, and U5 have substantially the same configuration, the printing units U1, U2, and U3 can perform two-color printing, and the printing units U4, U5 can perform four-color printing. Is possible. However, the printing units U4 and U5 can be used as two-color printing units by dividing them up and down. The printing units U1, U2, U3, U4, and U5 have an ink supply device, a plate cylinder, a blanket cylinder, and the like.

  In the web pass device D, the web pass unit D1 is provided for the printing units U1, U2, U3, U4, U5. The web path unit D1 sets a slitter D11 that cuts the web W along the longitudinal direction (vertical longitudinal direction of the web W, conveyance direction of the web W) at the center in the width direction, and a travel path of the longitudinally cut web W. Turn bar D12, and a compensator D13 for adjusting the transport position of the web W in the longitudinal direction.

  In the folding machine F, the folding units F1, F2 have substantially the same configuration. When a plurality of webs W are overlapped and introduced from the web pass unit D1, the folding units F1 and F2 respectively fold the web W vertically, cut horizontally by a predetermined length, and then horizontally fold to form a fold. And it can be discharged as a newspaper.

  Here, the printing unit U5 in the printing apparatus U will be described in detail. The other printing units U1 to U4 have substantially the same configuration.

  As shown in FIG. 6, the printing unit U5 is an H-type tower unit so that four-color printing is possible. In the printing unit U5, 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, the stack 24 arranged on the uppermost side will be described in detail.

  As shown in FIG. 7, the stack 24 is a front surface printing unit that performs front surface printing with respect to the transport path (web transport position) of the web W along the upper direction in the vertical direction, and the right side performs back surface printing. This is a back surface printing unit to be performed.

  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 include ink original rollers 71a and 71b, ink keys 72a and 72b constituting ink fountains, ink delivery rollers 73a and 73b, ink kneading rollers 74a and 74b, and ink reciprocating rollers 75a and 75b. And ink kneading rollers 76a and 76b, ink reciprocating rollers 77a and 77b, and two ink adhering rollers 78a, 78b, 79a and 79b. The dampening devices 64a and 64b are composed of water rider rollers 81a and 81b, water reciprocating rollers 82a and 82b, and swimsuit rollers 83a and 83b.

The ink supply devices 54a and 54b may be a digital ink pump method, and the dampening devices 64a and 64b may be a spray method. Moreover, it is preferable that the ink (black ink, process ink) to be used has the following Raleigh viscosity.
[Inkwell format]
Black ink-5-10Pa · S
Process ink -4-8Pa · S
[Digital ink pump system]
Black ink-8-10Pa · S
Process ink -6-8Pa · S

  The ink supply devices 54a and 54b of the present embodiment are an ink fountain type, and are configured by arranging a plurality of ink keys 72a and 72b along the width direction with respect to one ink source roller 71a and 71b. The ink base rollers 71a and 71b and the ink keys 72a and 72b can store ink having a predetermined fluidity (viscosity) set in advance, and open the ink keys 72a and 72b to obtain a predetermined amount. Ink can be sent out. The ink fountain rollers 71a and 71b are formed of a metal surface, are rotatably supported by a frame (not shown), and can be driven and rotated by a driving device described later.

  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 are rotatably supported by the frame so as to be in contact with the ink source rollers 71a and 71b. Has been. The ink kneading rollers 74a and 74b knead the ink delivered from the ink delivery rollers 73a and 73b. The surfaces of the ink kneading rollers 74a and 74b are formed of rubber and are 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. The surface of the ink kneading rollers 76a and 76b is formed of rubber and is rotatable on the frame so as to be in contact with the ink reciprocating rollers 75a and 75b. It is supported. 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 surface is formed of metal and rotates to the frame so as to come into contact with the ink kneading rollers 76a and 76b. It is supported freely and can reciprocate 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 rotational transmission by frictional contact with the respective rotating rollers.

  The ink delivery rollers 73a and 73b, the ink kneading rollers 74a and 74b, the ink kneading rollers 76a and 76b, the ink reciprocating rollers 77a and 77b, and the ink applying rollers 78a, 78b, 79a, and 79b constitute an ink conveying roller.

  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. 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 a printing plate (not shown) is wound. After the dampening water from the swimsuit rollers 83a and 83b is transferred to the non-image area of the printing plate, The inks 78b, 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. Here, the left and right blanket cylinders 34a and 34b are arranged so as to be displaced in the vertical direction by a predetermined height. That is, the left and right blanket cylinders 34a and 34b are arranged at a position rotated by a predetermined angle θ with respect to the horizontal line, so that the left blanket cylinder 34a is positioned above the right blanket cylinder 34b by a predetermined height. ing. 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.

  Hereinafter, although the ink supply apparatus of this embodiment is demonstrated, the ink supply apparatus of this embodiment is applicable to the ink supply apparatus 51a, 51b, 52a, 52b, 53a, 53b, 54a, 54b mentioned above. . FIG. 1 is a schematic configuration diagram illustrating an ink supply apparatus according to the present embodiment, FIG. 2 is a graph illustrating a printing speed function map, and FIG. 3 is a graph illustrating a printing copy number function map.

  As shown in FIG. 1, the ink supply apparatus of the present embodiment sets an ink supply amount according to a printing speed, and adjusts the ink supply amount set according to the printing speed according to the number of copies. .

  The control device 101 includes a calculation unit 102 and a control unit 103. The control device 101 is connected with an operation unit 104, a number detection unit 105, and a rotation number detection unit 106. The control device 101 receives pattern data (standard data / image information) from a server (not shown). The calculation unit 102 calculates a line drawing rate for each ink key based on the input pattern data. The control device 101 receives a printing speed from a printing press control unit (not shown). The operation unit 104 is operable by an operator, and inputs a color adjustment instruction value according to, for example, a printed newspaper. The number of copies detection unit 105 counts the number of printed newspapers, and outputs the detected number of newspaper copies to the control device 101. The rotation speed detection unit 106 detects the rotation speed of the ink base rollers 71 a and 71 b (see FIG. 7), and outputs the detected ink base roller rotation speed to the control device 101. The calculation unit 102 calculates the ink key opening degree and the ink source roller rotation number for each ink key based on the image line rate, the printing speed, the color adjustment instruction value, the number of copies, and the ink source roller rotation number for each ink key.

  The control device 101 is connected to a storage unit 107. The storage unit 107 stores an ink speed function map and an ink number function map. As shown in FIG. 2, the ink speed function map is a graph for defining the ink original roller rotation speed with respect to the printing speed, and the ink original roller rotation speed increases as the printing speed increases. Yes. As shown in FIG. 3, the ink copy number function map is a graph for defining the adjustment amount (adjustment ratio) of the ink original roller rotation speed with respect to the print copy number, and is set in advance from the start of printing as the print copy number increases. The amount of adjustment of the rotation speed of the ink source roller is also increased over a predetermined period up to the predetermined number of printed copies.

  That is, in the ink copy number function map, during the period from 0 to N1 (for example, 1000 copies), the adjustment amount of the ink source roller rotation number is increased from R1 to R2 (for example, 5%), and the number of copies to be printed. In the period from N1 to N2 (for example, 2000 copies), the ink supply from the start of printing to the predetermined number of copies N2 is increased by increasing (for example, 7%) the rotation amount of the ink source roller from R2 to R3. Increase the amount gradually. In this case, the amount of adjustment of the ink base roller rotation speed is gradually increased by two steps, but it may be one step or may be three or more steps. Further, the amount of increase may be gradually increased or gradually decreased.

  In the rotary printing press P, the ink density fluctuates (increases or decreases) when printing is started and when a certain amount of time has elapsed since the start of printing. Factors that increase the ink density include an increase in the nip pressure between the rollers due to an increase in the ink temperature and an increase in the roller temperature due to frictional heat of the rollers. On the other hand, factors that cause a decrease in ink density include a case where ink emulsification progresses and ink transfer is inhibited, and a decrease in ink transfer amount due to an increase in roller temperature and softening of rubber on the roller surface. Furthermore, when printing is started, foreign matter such as ink and paper dust accumulates on each roller, plate cylinder, and blanket cylinder (pyling), thereby reducing the amount of ink transfer. In addition, when ink is applied to the rubber roller in advance before the ink application roller is put on (referred to as ink winding), if the amount of ink winding is set to be large, the density at the initial stage of printing is high. There is also a factor that the concentration decreases because it gradually approaches normal conditions. As described above, various factors can be considered for fluctuations in the ink density, and also vary depending on the operating conditions and environment. In response to these ink density fluctuations, the ink supply apparatus of this embodiment adjusts (increases or decreases) the ink supply amount by changing the rotation speed of the ink base roller.

  In FIG. 3, the ink supply amount is gradually increased from the start of printing to the predetermined number of copies N2, but the present invention is not limited to this mode. As shown in FIG. 4, in the ink copy number function map, during the period from 0 to N1 (for example, 1000 copies), the adjustment amount of the ink source roller rotation speed is constant at R1, and the number of print copies is set to N1. Then, the adjustment amount of the ink fountain roller rotation speed is increased from R1 to R2 (for example, 5%), and the adjustment amount of the ink fountain roller rotation speed is increased during the period from the printing number N1 to N2 (for example, 2000 copies). When R2 is constant and the number of copies is N2, the ink supply amount is increased from the start of printing to the predetermined number of copies N2 by increasing the adjustment amount of the ink source roller from R2 to R3 (for example, 7%). Increase. In this case as well, the adjustment amount of the ink base roller rotation speed is increased by two steps, but it may be one step or three or more steps. Further, the amount of increase at each stage may be gradually increased or gradually decreased.

  This ink copy number function map increases the ink supply amount gradually or stepwise only for a predetermined period from the start of printing to the predetermined print copy number N2. Therefore, the adjustment amount of the ink source roller rotation number is constant and the ink supply amount is also constant during the period after reaching the predetermined print number N2 from the start of printing.

  Further, the control device 101 is connected to the drive motor 108 of the ink source rollers 71a and 71b (see FIG. 7) and to the drive motor 109 of the ink keys 72a and 72b (see FIG. 7). That is, the calculation unit 102 sets the ink key opening degree for each ink key based on the image line rate, color adjustment instruction value, and ink original roller rotation speed for each ink key, and sets the ink original roller rotation speed based on the printing speed. Then, the rotation speed of the ink base roller is adjusted based on the number of copies to be printed. The control unit 103 controls the rotational speed of the drive motor 108 based on the adjusted ink base roller rotational speed, and also controls the rotational speed of the drive motor 109 based on the ink key opening for each set ink key.

  The storage unit 107 stores an ink copy number function map. A plurality of ink copy function maps are stored according to different printing conditions and different printing patterns. The ink copy number function map specifies the adjustment amount of the ink original roller rotation speed with respect to the print copy number. For example, the temperature as the printing condition (ink temperature, ink fountain temperature, roller temperature, atmospheric temperature, lubricating oil temperature, etc.) ), The adjustment amount of the rotation speed of the ink base roller may be finely adjusted according to the printing speed, ink key opening, dampening water supply amount, water content of the ink rubber roller, and the like. In this case, it is desirable to set a weighting factor for the number of copies to be printed, temperature, printing speed, ink key opening, dampening water supply amount, and water content of the ink rubber roller. The speed, ink key opening, dampening water supply amount, and ink rubber roller moisture content are combined to 0.2.

  In addition, the amount of adjustment of the rotation speed of the ink source roller can be adjusted according to the number of plates as the operation pattern (first edition, second edition, third edition, etc.), ink characteristics, paper type, paper size, drawing rate, number of printing colors, etc. Fine adjustments may be made. In a rotary printing press, the state is different at the start of printing a day and thereafter. In the first version for printing the first job, the temperature of the entire rotary printing press is low (referred to as cold start), and in the second and third versions, the temperature gradually increases (referred to as hot start). ). Therefore, it is also necessary to finely adjust the adjustment amount of the ink source roller rotation speed in accordance with the plate number. In this case, it is desirable to set a weighting coefficient for the plate number, ink characteristics, paper type, paper size, image line ratio, plate number, and print color number. For example, the number of copies is set to 0.8, the plate number, The ink characteristics, paper type, paper size, image line ratio, plate number, and number of printing colors are combined to 0.2.

  As described above, the ink copy number function map can be adjusted according to different printing patterns and different printing conditions, and a plurality of ink copy number function maps for specific printing patterns and specific printing conditions are stored in the storage unit 107. It may be used selectively. Note that the above-described number of printing copies, printing conditions, and weighting coefficients for different printing conditions are merely examples, and may be set as appropriate.

  In addition, the operator adjusts the ink roller rotation speed by inputting a color adjustment instruction value using the operation unit 104 according to the printing state of the printed newspaper. The ink roller rotation speed at this time is adjusted. The adjustment amount may be reflected in the ink copy number function map to be learned, or the learned ink copy number function map may be stored in the storage unit 107. The ink copy number function map stored in the storage unit 107 can be called and changed.

  The control device 101 is connected to a concentration detection unit 111, a water content detection unit 112, and a temperature detection unit 113. The density detection unit 111 detects the print density of the newspaper after printing, and the detected print density is output to the control device 101. The water content detection unit 112 detects the water content of the ink used for printing, and the detected water content of the ink is output to the control device 101. The temperature detector 113 detects the roller surface temperature of the ink forming rollers 78 a, 78 b, 79 a, 79 b, and the detected surface temperature of the ink forming rollers 78 a, 78 b, 79 a, 79 b is output to the control device 101. . The calculation unit 102 can change the ink copy number function map stored in the storage unit 107 according to the input printing density, ink water content (water content), and the temperature of the ink application roller, and can also change An ink copy function map can be stored. In the present embodiment, the temperature detected by the temperature detection unit 113 is the roller surface temperature of the ink forming rollers 78a, 78b, 79a, 79b, but is not limited to this. Other roller temperatures of the ink supply devices 54a and 54b, ink temperature, ink fountain temperature, atmospheric temperature, lubricating oil temperature, and the like may be used.

  Therefore, as shown in FIGS. 1 and 7, for example, in the stack 24, the ink keys 72 a and 72 b are adjusted to a predetermined opening, and the ink source rollers 71 a and 71 b are rotated at a predetermined speed to be metered. Ink is supplied to the ink delivery rollers 73a and 73b through the ink base rollers 71a and 71b.

  At this time, the calculation unit 102 of the control device 101 sets the ink key opening for each ink key based on the pattern data, the color adjustment instruction value, and the ink base roller rotation speed. In addition, the calculation unit 102 sets the ink source roller rotation number using the ink speed function map based on the printing speed, and adjusts the ink source roller rotation number using the ink number function map based on the printing number. The control unit 103 controls the rotational speed of the drive motor 108 based on the adjusted ink base roller rotational speed, and also controls the rotational speed of the drive motor 109 based on the ink key opening degree for each set ink key. That is, since the drive motor 108 of the ink original rollers 71a and 71b is controlled based on the ink copy number function map, as shown in FIG. 3 or FIG. 4, a predetermined print copy reaching a predetermined print copy from the start of newspaper printing is provided. The ink supply amount is adjusted to increase over the period.

  The ink supplied from the ink source rollers 71a and 71b to the ink delivery rollers 73a and 73b is delivered to the ink reciprocating rollers 75a and 75b through the ink kneading rollers 74a and 74b, and the ink reciprocating rollers 75a and 75b are axially moved. By reciprocating, it is expanded in the width direction. The ink spread in the width direction by the ink reciprocating rollers 75a and 75b is transferred to the ink reciprocating rollers 77a and 77b through the ink kneading rollers 76a and 76b, and the ink reciprocating rollers 77a and 77b reciprocate in the axial direction. By doing so, it is further expanded in the width direction.

  The water rider rollers 81a and 81b apply dampening water to the water reciprocating rollers 82a and 82b, and the dampening water is transferred to the plate surfaces of the plate cylinders 44a and 44b by the swimsuit rollers 83a and 83b. At this time, the dampening water of the swimsuit rollers 83a and 83b is transferred only to the non-image portion of the printing plate mounted on the plate cylinders 44a and 44b. On the other hand, the ink spread in the width direction by the ink reciprocating rollers 77a and 77b is supplied to the ink applying rollers 78a, 78b, 79a and 79b, and the ink applying rollers 78a, 78b, 79a and 79b are rotated to rotate the plate. It is delivered to the printing plates of the cylinders 44a and 44b. At this time, the ink on the ink application rollers 78a, 78b, 79a, 79b is transferred only to the image line portions of the printing plates mounted on the plate cylinders 44a, 44b. The plate cylinders 44a and 44b rotate to transfer the ink in the image line portion of the printing plate to the blanket cylinders 34a and 34b.

  Thereafter, when the web W passes through the nip portion between the blanket cylinders 34a and 34b, the ink (pattern) transferred to the blanket cylinders 34a and 34b by the printing pressure is transferred to the front and back of the web W. That is, the ink on the blanket cylinder 34a is transferred to the front surface of the web W, and the ink on the blanket cylinder 34b is transferred to the back surface of the web W, whereby double-sided printing on the web W is performed. At this time, since the ink supply amount is adjusted so as to increase over a predetermined period from the start of newspaper printing to a predetermined number of copies, it is possible to suppress a decrease in print density due to the printing conditions and the printing pattern.

  As described above, in the ink supply device of this embodiment, the calculation unit 102 of the control device 101 sets the ink supply amount according to the printing speed, and sets the ink supply amount set according to the printing speed to the number of copies. The control unit 103 controls the ink key opening and the rotation speed of the ink base roller.

  Therefore, the ink supply amount is set according to the printing speed, and the set ink supply amount is adjusted according to the number of print copies. The increase / decrease is suppressed, and the printing quality can be improved by maintaining the printing density constant. The ink temperature, the ink emulsification state, and the piling, which are factors that change the density, are substantially proportional to the rotation speed of the printing press, that is, the number of copies. Therefore, when other conditions change, for example, it takes time for color matching, and even if there is a variation in the time from the completion of adjustment to the start of actual printing, it is stable by managing the number of copies. Ink supply can be performed.

  In the ink supply apparatus of the present embodiment, the ink supply amount is increased over a predetermined period from the start of printing to a predetermined number of print copies. Therefore, a decrease in print density due to roller temperature rising from the start of printing, emulsification of ink, and piling increasing from the start of printing can be suppressed, and the print density can be kept constant.

  In the ink supply apparatus of the present embodiment, the ink supply amount is gradually increased from the start of printing to a predetermined number of printed copies. Therefore, the print density can be kept constant by finely controlling the ink supply amount with respect to the print density that changes every moment.

  In the ink supply apparatus of this embodiment, the ink supply amount is increased stepwise from the start of printing to a predetermined number of prints. Therefore, simplification of control can be achieved.

  In the ink supply apparatus of the present embodiment, an ink speed function that defines the relationship between the printing speed and the ink supply amount and an ink number function that defines the relationship between the number of printed copies and the ink supply adjustment amount are provided, and the ink speed function is Use to set the ink supply, and adjust the ink supply using the ink copies function. Accordingly, it is sufficient to set the ink speed function and the ink copy number function in advance, the ink supply amount can be easily set by simple control, and the control can be simplified.

  In the ink supply apparatus of the present embodiment, the ink number function can be adjusted according to the printing pattern. Therefore, it is possible to set the ink supply amount according to the print pattern.

  In the ink supply apparatus of this embodiment, a plurality of ink copy number functions are set according to different print patterns, and can be selectively used. Therefore, it is not necessary to adjust the ink number function, and the ink supply amount according to the print pattern can be easily set.

  In the ink supply device of the present embodiment, the ink number function can be adjusted according to different printing conditions. Accordingly, it is possible to set the ink supply amount according to the printing conditions.

  In the ink supply apparatus of the present embodiment, the storage unit 107 that stores the ink copy number function is provided, and the ink copy number function stored in the storage unit 107 can be changed according to the adjustment amount of the ink copy function. Therefore, the ink copy number function in the storage unit 107 can be updated as needed.

  In the ink supply apparatus according to the present embodiment, a storage unit 107 that stores an ink copy number function and a density detection unit 111 that detects a print density are provided, and the storage unit 107 detects the print density detected by the density detection unit 111. The stored ink number function can be changed. Therefore, by changing the ink copy number function stored in the storage unit 107 in accordance with the automatically detected print density, the ink copy number function in the storage unit 107 can be updated according to the print density as needed. it can.

  In the ink supply apparatus of the present embodiment, a storage unit 107 that stores the ink copy number function and a water content detection unit 112 that detects the water content of the ink are provided, and according to the water content of the ink detected by the water content detection unit 112. Thus, the ink copy number function stored in the storage unit 107 can be changed. Therefore, the ink copy number function stored in the storage unit 107 is changed according to the moisture content in the automatically detected ink, so that the ink copy number function in the storage unit 107 is updated according to the water content in the ink as needed. Can be.

  In the ink supply apparatus of the present embodiment, a control apparatus 101 that adjusts the ink supply amount by controlling the number of rotations of the ink base rollers 71a and 71b according to the number of copies is provided. Therefore, the ink supply amount in the width direction of the web W can be uniformly adjusted by simple control of increasing or decreasing the rotation speed of the ink base rollers 71a and 71b.

  The ink supply method of the present embodiment includes an ink supply amount setting step for setting the ink supply amount according to the printing speed, and an ink supply for adjusting the ink supply amount set according to the printing speed according to the number of copies. An amount adjusting step and an ink supplying step for supplying an ink supply amount adjusted according to the number of copies to the plate cylinder.

  Therefore, even if the printing conditions fluctuate when the number of printed copies increases, the increase or decrease in the printing density is suppressed, and the printing quality can be improved by maintaining the printing density constant.

  In addition, the ink supply amount control device according to the present embodiment sets the ink supply amount according to the printing speed, and adjusts the ink supply amount set according to the printing speed according to the number of copies. Therefore, even if the printing conditions fluctuate when the number of printed copies increases, the increase or decrease in the printing density is suppressed, and the printing quality can be improved by maintaining the printing density constant.

  In the printing machine according to the present embodiment, the ink supply devices 51a, 51b, 52a, 52b, 53a, 53b, 54a, and 54b for supplying ink and the ink supply devices 51a, 51b, 52a, 52b, and 53a, Plate cylinders 41a, 41b, 42a, 42b, 43a, 43b, 44a, 44b, and plate cylinders 41a, 41b, 42a, 42b, 43a are supplied with ink from 53b, 54a, 54b to the plate mounted on the outer periphery. , 43b, 44a, 44b are provided with blanket cylinders 31a, 31b, 32a, 32b, 33a, 33b, 34a, 34b for transferring the ink images to the web W.

  Therefore, the ink supply amount is set according to the printing speed, and the set ink supply amount is adjusted according to the number of print copies. The increase / decrease is suppressed, and the printing quality can be improved by maintaining the printing density constant.

  In the above-described embodiment, the ink supply amount is adjusted by controlling the number of rotations of the ink base roller according to the number of printing copies. However, the ink key opening degree is controlled according to the number of printing copies, or the digital ink The ink supply amount may be adjusted by controlling the ink discharge amount by the pump.

P Newspaper web offset press (printer)
R paper feeding device R1, R2, R3, R4, R5 paper feeding unit I infeed device I1, I2, I3, I4, I5 infeed unit U printing device U1, U2, U3, U4, U5 printing unit D web pass device D1 Web pass unit D11 Slitter D12 Turn bar D13 Compensator F Folding machine F1, F2 Folding unit 21, 22, 23, 24 Stack 31a, 31b, 32a, 32b, 33a, 33b, 34a, 34b Blanket cylinder 41a, 41b, 42a, 42b , 43a, 43b, 44a, 44b Plate cylinders 51a, 51b, 52a, 52b, 53a, 53b, 54a, 54b Ink supply devices 61a, 61b, 62a, 62b, 63a, 63b, 64a, 64b Wetting devices 71a, 71b Ink Former rollers 72a, 72b Ink key 101 Control device 102 Calculation unit 103 Control unit 104 Operation unit 105 Number detection unit 106 Number of rotation detection unit 107 Storage unit 108 Ink source roller drive motor 109 Ink key drive motor 111 Concentration detection unit 112 Water content detection unit 113 Temperature detection unit W Web (printing paper)

Claims (15)

In the ink supply device that sets the ink supply amount according to the printing speed,
Adjust the ink supply amount set according to the printing speed according to the number of copies at the time of final printing,
An ink supply device characterized by that.   2. The ink supply device according to claim 1, wherein the ink supply amount is increased over a predetermined period from the start of printing to a predetermined number of printed copies.   The ink supply apparatus according to claim 2, wherein the ink supply amount is gradually increased from the start of printing to the predetermined number of printed copies.   The ink supply apparatus according to claim 2, wherein the ink supply amount is increased stepwise from the start of printing to the predetermined number of printing copies.   An ink speed function that defines the relationship between the printing speed and the ink supply amount and an ink number function that defines the relationship between the number of copies to be printed and the ink supply adjustment amount are provided, and the ink supply amount is set using the ink speed function. The ink supply device according to any one of claims 1 to 4, wherein the ink supply amount is adjusted using a function of the number of ink parts.   The ink supply apparatus according to claim 5, wherein the ink number function is adjustable according to a printing pattern.   The ink supply device according to claim 5 or 6, wherein a plurality of the ink copy number functions are set according to different printing patterns and can be selectively used.   The ink supply apparatus according to any one of claims 5 to 7, wherein the ink number function can be adjusted according to different printing conditions.   The storage unit for storing the ink copy number function is provided, and the ink copy function stored in the storage unit can be changed according to the adjustment amount of the ink copy function. Item 9. The ink supply device according to any one of Items 8 above.   A storage unit for storing the ink copy number function and a print state detection unit for detecting a print state are provided, and the ink copy number function stored in the storage unit according to the print state detected by the print state detection unit is The ink supply device according to any one of claims 5 to 8, wherein the ink supply device is changeable.   A storage unit for storing the ink copy number function and an ink concentration detection unit for detecting ink density are provided, and the ink copy number function stored in the storage unit according to the ink density detected by the ink concentration detection unit is The ink supply device according to any one of claims 5 to 8, wherein the ink supply device is changeable.   An ink supply source, an ink original roller that supplies ink delivered from the ink supply source, a plurality of ink conveyance rollers that convey ink supplied from the ink original roller to a plate cylinder, and the number of copies The ink supply device according to claim 1, further comprising a control device that adjusts an ink supply amount by controlling a rotation speed of the ink base roller. An ink supply amount setting step for setting the ink supply amount according to the printing speed;
An ink supply amount adjustment step for adjusting the ink supply amount set according to the printing speed according to the number of copies at the time of final printing;
An ink supply step for supplying an ink supply amount adjusted according to the number of copies to the plate cylinder;
An ink supply method characterized by comprising: Set the ink supply amount according to the printing speed, and adjust the ink supply amount set according to the printing speed according to the number of copies at the time of final printing.
An ink supply amount control device characterized by that.
An ink supply device according to any one of claims 1 to 12,
A plate cylinder in which ink is supplied from the ink supply device to the printing plate mounted on the outer periphery;
A blanket cylinder for transferring an image of ink received from the plate cylinder to a web;
A printing machine comprising:

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