JP2006289616A - Intermediate tank of dampening water circulatory supply device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent dampening water from being degraded by a separated foreign substance and thereby, prolong the active life of the dampening water. <P>SOLUTION: This intermediate tank comprises a water running tank 24 with its lower part connected with the side of a connecting part 9a for draining the dampening water from a water trough 9 and its upper part connected with the side of a connecting part 9b for water supply of the dampening water to the water trough 9, and a filter part 23 which is arranged inside the water running tank 24 and equipped with a large number of particulate members 31 suspended in the dampening water. In addition, inside a water running tank 44, a filter part 43 is installed which is equipped with almost U-shape dampening water flow paths 47A to 47C having first water running parts 48A to 48C extending downward with their respective upper parts connected with the side of the connecting part 9a for draining the dampening water from the water trough 9, and upward extending second water running parts 49A to 49C for running the dampening water, which have their respective lower ends communicating with the first water running parts 48A to 48C and are formed on the side of the connecting part 9b for water supply of the dampening water to the water trough 9. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an intermediate tank of a dampening water circulation supply device that is ancillary equipment of an offset printing press.

  As shown in FIG. 6, the offset printing machine includes a large-sized roller (plate cylinder) 1, a large-diameter roller (blanket cylinder) 3, a plurality of small-diameter ink roller groups 4, a small-diameter rubber roller 7, and the like. It is composed of a roller group 6. The roller 1 is provided with a printing plate 2 made of an aluminum plate or the like whose surface is subjected to a photoresist process in order to form an image line such as a pattern with ink. The large-diameter roller 3 is obtained by winding a rubber plate that receives ink from the printing plate 2 and transfers it to paper. The small-diameter ink roller group 4 serves as an ink supply means for supplying ink to the printing plate 2. The rubber roller 7 is arranged alternately with the chrome roller 8 and supplies dampening water to the non-image area of the printing plate 2 to prevent ink from adhering to the non-image area due to repulsion. It plays the role of In addition, 5 is an ink fountain.

  The lower chrome roller 8 which is a water supply roller of the dampening water supply means is disposed so that a part of the chrome roller 8 is immersed in the dampening water with respect to the water boat 9 storing dampening water at a predetermined water level. Has been. The dampening water in the water boat 9 is regenerated by a circulation supply device having an intermediate tank 10 and a cooling circulation tank 13 and is always circulated and supplied. Here, the regeneration treatment is to extinguish bubbles (hereinafter referred to as “defoaming”) contained in the fountain solution and to filter foreign substances contained in the fountain solution.

  The intermediate tank 10 is connected to the drainage connection portion 9a of the water boat 9, and is defoamed by temporarily storing the dampening water naturally drained from the water boat 9 by overflow, and the ink is solidified. A rough foreign matter such as is filtered by the filter 11. The dampening water filtered through the filter 11 is stored at a predetermined water level in the intermediate tank 10 by the float 12 and settles at the bottom with foreign matters such as paper powder, fine ink components and spray powder that could not be filtered. Only the supernatant is supplied to the cooling circulation tank 13 on the water supply connection portion 9b side of the water boat 9.

  The cooling circulation tank 13 mixes dampening water replenished from a replenishing tank (not shown) with dampening water supplied from the intermediate tank 10 and adjusts the temperature of the mixed dampening water. The water boat 9 is supplied.

  However, the intermediate tank 10 is an accessory of the offset printing press and is disposed so as to be positioned below the offset printing press from the structure in which the dampening water is drained by natural fall. Bad, often left unattended. As a result, the paper dust and ink components precipitated in the intermediate tank 10 become sludge deposits, and there is a problem that the dampening water accumulated at a constant amount is always deteriorated.

  The present invention has been made in view of the conventional problems, and provides an intermediate tank of a dampening water circulation supply device that prevents deterioration of dampening water due to separated foreign matter and can extend the life of dampening water. It is an object to do.

  In order to solve the above-mentioned problem, the first intermediate tank of the dampening water circulation supply device of the present invention is disposed below the water boat that stores dampening water that immerses a part of the water supply roller of the offset printing press. In the intermediate tank of the dampening water circulation supply device that filters dampening water drained from the waterboat and circulates it to the waterboat, a lower portion is provided on the side of the connecting portion for draining dampening water from the waterboat. A water tank connected to and connected to the side of the connecting portion for supplying dampening water to the water boat, and a plurality of granular members arranged in the water tank and floating in the dampening water. It has a configuration with.

  According to this first intermediate tank, a large number of granular members floating in the dampening water are arranged for the water tank that takes in dampening water from the water boat from the bottom and discharges it from the top. Foreign matter such as ink lump and paper dust contained in the fountain solution passed through the water tank adheres to the surface of the granular member, and only clean fountain solution obtained by separating them is supplied to the water boat. It can supply to the side of the connection part for water supply. And since the dampening water in a water tank does not stay at the time of printing with an offset printing machine, and always becomes a water flow state, dampening water is not deteriorated by the separated foreign material.

  The second intermediate tank is disposed below the fountain for storing dampening water in which a part of the water supply roller of the offset printing press is immersed, and filters the dampening water drained from the fountain. In the intermediate tank of the dampening water circulation supply device that circulates and supplies to the water boat, a downwardly extending upper portion is connected to the side of the connecting portion for draining dampening water from the water boat inside the water tank. 1 water flow part, and the 2nd water flow part extended upwards which let a lower end communicate with this 1st water flow part and the dampening water is supplied to the side of the connection part for the supply of dampening water to the water boat It is set as the structure provided with the substantially U-shaped dampening water flow path which has.

  According to the second intermediate tank, a first water passage portion that takes dampening water from the upper part into the water tank, and a second water passage that drains from the upper portion through communication between the first water passage portion and the lower portion. Since the substantially U-shaped dampening water flow path composed of the part is provided, the bubbles contained in the dampening water flowing through the dampening water flow path can be reliably removed. Also, the oil and ink components contained in the fountain solution are separated at the water surface of the first water flow section, and foreign matter such as ink clumps and paper dust is precipitated at the bottom communication section, and these are separated and cleaned. Only dampening water can be supplied to the side of the water supply connection to the water boat. And since the dampening water in a water tank does not stay at the time of printing with an offset printing machine, and always becomes a water flow state, dampening water is not deteriorated by the separated foreign material.

  Further, the third intermediate tank is disposed under the fountain for storing dampening water in which a part of the water supply roller of the offset printing press is immersed, and filters the dampening water drained from the fountain. In the intermediate tank of the dampening water circulation supply device that circulates and supplies the water boat, the first filter portion connected to the side of the connecting portion for draining the dampening water from the water boat, and connected to the first filter portion And a second filter portion connected to the side of the connecting portion for supplying the dampening water to the water boat, wherein the first filter portion is a connecting portion for draining the dampening water from the water boat. A first water tank having a lower part connected to the second filter part and an upper part connected to the second filter part, and a plurality of granular members disposed in the first water tank and floating in the dampening water. The second filter part is disposed inside the second water tank, and the first filter part passes through the first filter part. A first water passage having an upper portion connected to the tank, and an upward direction in which the lower end communicates with the first water passage and the dampening water is fed to the connection portion for supplying dampening water to the water boat. It is set as the structure provided with the substantially U-shaped dampening water flow path which has the 2nd water flow part extended in this.

  According to the third intermediate tank, coarse foreign matters contained in the fountain solution are separated by the first filter portion, and bubbles, fine foreign matters and oil are separated by the second filter portion, and only clean fountain solution is obtained. Can be supplied to the side of the water supply connection to the water boat. And since the dampening water in a water tank does not stay at the time of printing with an offset printing machine, and always becomes a water flow state, dampening water is not deteriorated by the separated foreign material.

  The first and third intermediate tanks are preferably provided with stirring means for stirring the granular member and the fountain solution. If it does in this way, the foreign material adhering to a granular member can be isolate | separated by operating a stirring means, and it can be made to settle on the bottom of a water flow tank.

Further, in the second and third intermediate tanks, the second different in the substantially U shape having the first water flow portion and the second water flow portion on the downstream side of the second water flow portion in the dampening water flow path. It is preferable to provide a dampening water flow path and provide two or more dampening water flow paths in the water flow tank. In this way, foreign matters and oil contained in the fountain solution can be further separated.
In addition, a water storage section whose upper end communicates with the second water flow section is further provided on the downstream side of the dampening water flow path, and a water level detection means is provided in the water storage section. Preferably, the dampening water is drained to the side of the water supply connection to the water boat by means. In this way, the dampening water can be surely drained without causing malfunction such as foaming in the drainage means such as the pump.

  Further, in the first to third intermediate tanks, it is preferable to further provide a filter portion provided with a filter medium on the side of the connecting portion for supplying dampening water to the water boat. In this way, the dampening water can be more reliably cleaned, and the dampening water can be reliably extended in life.

  Furthermore, a foreign matter discharge pipe is connected to the bottom of the water passage tank, and an air supply means for supplying air at a predetermined pressure is provided upstream of the foreign matter discharge pipe. It is preferable to provide an on-off valve downstream from the connecting portion. In this way, cleaning workability can be improved.

  In the intermediate tank of the dampening water circulation supply apparatus of the present invention, when the offset printing press is in operation, the dampening water always flows in the water tank, so that it is exposed to separated foreign substances for a long time. It is possible to prevent the dampening water from deteriorating. Therefore, the service life of the dampening water can be extended, and the number of times of cleaning the intermediate tank itself can be reduced as well as the number of regular replacement operations of the dampening water.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows an intermediate tank 20 of a dampening water circulation supply device according to an embodiment of the present invention. The intermediate tank 20 is disposed so as to be located below the water boat 9 shown in FIG. 6, and after regenerating (foaming and filtering) the dampening water drained from the water boat 9, the intermediate tank 20 is cooled and circulated. A dampening water circulation supply device that circulates and supplies the water boat 9 via the tank 13 is configured. The interior of the exterior body 21 is partitioned by partition walls 22a and 22b, and the first to third filter portions 23 and 43 are formed. , 60 are provided.

  The first filter part 23 is formed on the right side of the exterior body 21 and allows the dampening water naturally drained by overflow from the water boat 9 to pass through by gravity depending on the height difference, so that the ink mass, paper powder, spray powder, etc. A large number of granular members 31 and stirring members 32 are disposed inside the first water tank 24.

  The first water tank 24 has a cylindrical shape with a closed lower end in which an inclined portion 25 having an inverted conical cylindrical shape is provided in the lower part. In the first water tank 24, a first water inlet 26 is provided in the inclined portion 25, and a first connection pipe 27 connected to the drain connection 9 a of the water boat 9 is connected to the first water inlet 26. ing. Further, the upper end opening of the first water tank 24 is hermetically sealed by the first lid 28. The first lid 28 is provided with a first drainage port 29, and a second connection pipe 30 connected to a second filter part 43 described later is disposed in the first drainage port 29. Thereby, the dampening water drained by overflow from the water boat 9 flows in from the lower part by gravity due to the height difference, and is drained by overflow from the upper part.

  The granular member 31 functions as a filter medium that floats in the dampening water in the first water tank 24 and removes foreign matters contained in the dampening water by three-dimensional contact. The granular member 31 has a specific gravity of less than 1 and is made of a resin such as PP (polypropylene) that is chemically stable against the fountain solution in order to prevent the fountain solution or the granular member 31 itself from being altered. It is comprised by. The smaller the diameter of the granular member 31 is, the smaller the gap between the adjacent granular members 31 and 31 becomes, and it becomes possible to remove fine foreign matters, so that it is preferably 10 mm or less, more preferably 0.5 to 5 mm. . In addition, when the diameter of the granular member 31 is made smaller than 0.5 mm, the clearance gap between the adjacent granular members 31 and 31 will become too small, and it will inhibit the dampening water flow-through effect. Further, when the filling rate of the granular member 31 with respect to the first water tank 24 is too small, the filtration performance is lowered. On the other hand, when the filling rate is too large, stirring by the stirring member 32 described later cannot be performed. The volume of the water tank 24 is 10 to 80%, preferably 20 to 60%, more preferably 30 to 50%. Note that an antibacterial material may be used or mixed in the granular member 31 in order to prevent bacterial growth. In this embodiment, the solid sphere made of PP is used. However, when a material having a high specific gravity is used, a hollow structure may be used. Moreover, when using a chemically unstable material with respect to the fountain solution, the surface may be coated with a chemically stable material.

  The agitating member 32 serves as an agitating means for agitating the dampening water in the first water tank 24 and the granular member 31, and is held so as to be able to advance and retract in the vertical direction with respect to the first lid 28. The insertion shaft 33 and a disc portion 34 provided at the lower end of the insertion shaft 33 and extending in the horizontal direction. The disk portion 34 has a diameter through which the granular member 31 can pass between the outer peripheral portion and the inner wall of the first water tank 24, and is provided with a plurality of insertion holes 35 through which the granular member 31 can be inserted. ing. Note that a cylinder 36 is disposed on the upper portion of the first lid 28 as a driving unit that is connected to the upper end of the insertion shaft 33 and moves the stirring member 32 in the vertical direction.

  In the present embodiment, the first filter portion 23 is provided with a foreign matter discharging means for automatically discharging foreign matter deposited on the bottom of the first water tank 24. The foreign matter discharge means includes a discharge port 37 provided at the lower center of the inclined portion 25 of the first water tank 24, a foreign matter discharge pipe 38 connected to the discharge port 37, an air compressor 41, and an open / close It consists of valves 42A and 42B. The foreign matter discharge pipe 38 has a substantially T shape in which a discharge pipe part 40 extending linearly is provided at the lower end of a short connection pipe part 39 whose upper end is connected to the discharge port 37. The air compressor 41 is an air supply unit that is connected to one end on the upstream side of the discharge pipe section 40 and supplies compressed air having a predetermined pressure into the discharge pipe section 40. The on-off valves 42A and 42B are interposed in the discharge pipe portion 40 before and after the branch position with the connection pipe portion 39 (upstream side and downstream side), and are opened by the microcomputer 71 only when foreign matter is discharged. Is. The upstream first on-off valve 42A is for controlling the air pumping by the compressor 41, and the downstream second on-off valve 42B controls the drainage of the dampening water in the first water tank 24. Is to do.

  The second filter part 43 is formed at the center of the outer casing 21 and secondarily cleans the dampening water drained from the first filter part 23 through the second connection pipe 30 and is contained in the dampening water. The oil and ink components are removed, and a plurality (three) of dampening water flow paths 47A to 47C and a water storage section 54 are provided inside the second water tank 44.

  The second water tank 44 is formed by partitioning the exterior body 21 with the partition walls 22 a and 22 b, and an upper end opening thereof is hermetically sealed by a second lid 45. Further, the second water tank 44 is provided with a bottom wall 46 at a predetermined height from the bottom of the exterior body 21, and a space for piping is formed in the lower part thereof.

  The fountain solution channels 47A to 47C are U-shaped having first water passage portions 48A to 48C communicating with the upstream side and second water passage portions 49A to 49C communicating with the downstream side. Specifically, these dampening water flow paths 47A to 47C are provided with three first partition walls 50A to 50C extending vertically upward on the bottom wall 46 at a predetermined interval and vertically downward to the second lid 45. It is formed by providing three extended second partition walls 51A to 51C with a predetermined interval. Among them, the first partition walls 50A to 50C are configured to be stepped so as to have different overall heights, so that the dampening water flow (storage) capacity in the dampening water channels 47A to 47C is different. Yes.

  The first dampening water flow path 47A is partitioned in a U shape by the bottom wall 46, the partition wall 22a, the first partition wall 50A, and the second partition wall 51A, and at the upper end of the first water flow portion 48A. A second water inlet 52 is provided in the upper part of a certain partition wall 22 a, and the second water inlet 52 communicates with the first water tank 24 on the upstream side via the second connection pipe 30. In the present embodiment, an adsorbing member 53 made of a nonwoven fabric or the like that adsorbs oil is disposed above the first water passage 48A in the first dampening water channel 47A. The second dampening water flow path 47B is partitioned into a U shape by the bottom wall 46, the first partition walls 50A and 50B, and the second partition wall 51B, and the upper end of the first water passage 48B is the second. The space between the partition walls 51A and 51B communicates with the second water passage portion 49A of the first dampening water flow path 47A on the upstream side. The first partition wall 50B for forming the second fountain solution channel 47B is formed lower than the total height of the first partition wall 50A. The third fountain solution channel 47C is partitioned in a U shape by the bottom wall 46, the first partition walls 50B and 50C, and the second partition wall 51C, and the upper end of the first water passage 48C is the second. The space between the partition walls 51B and 51C communicates with the second water passage portion 49B of the second dampening water channel 47B on the upstream side. The first partition wall 50C for forming the third fountain solution channel 47C is formed lower than the total height of the first partition wall 50B.

  The water storage section 54 is partitioned by the bottom wall 46, the first partition wall 50C, and the partition wall 22b. The third reservoir which is on the upstream side by the space between the partition wall 22b and the second partition wall 51C. It communicates with the second water flow part 49C of the dampening water flow path 47C. The water storage unit 54 is provided with a water level sensor 55 and drainage means for draining dampening water in the water storage unit 54 to a third filter unit 60 described later based on the detection of the water level sensor 55. Yes. The water level sensor 55, which is a water level detecting means, includes three electrodes 56A to 56C, and can detect the lower limit water level by short-circuiting the electrodes 56A and 56B via dampening water, and can detect the lower limit water level by short-circuiting the electrodes 56A and 56C. Can be detected. The drainage means includes a second drainage port 57 provided at the bottom of the water storage unit, a third connection pipe 58 connected to the second drainage port 57 to a third filter unit 60 described later, and the third connection pipe 58. It consists of a pump 59 disposed in the middle part.

  The third filter part 60 is formed on the left side of the exterior body 21, and thirdarily cleans the dampening water that has been passed by the discharge pressure of the dampening water by the pump 59, and the first and second filter parts 23 and 43. In the third water tank 61, a cartridge type filter member 67 is disposed inside the third water tank 61.

  The third water tank 61 is formed by partitioning the interior of the exterior body 21 with the partition wall 22b, and a third water inlet 62 is provided below the partition wall 22b. It communicates with a water storage section 54 on the upstream side through a three-connection pipe 58. The upper end opening of the third water tank 61 is sealed by a third lid 63 so as to be opened and closed. The third lid 63 is provided with an attachment recess 64 for detachably attaching a filter member 67 described later. The mounting recess 64 is formed of a circular recess, and a screw groove (not shown) is provided on the inner peripheral edge thereof. Further, the third lid 63 is provided with a third drainage port 65 having one end opened in the mounting portion 70, and the third drainage port 65 is on the side of the water supply connection portion 9 b of the water boat 9. A connection pipe 66 connected to the cooling circulation tank 13 is provided.

  The filter member 67 is fixed to a filter medium 68 formed of a nonwoven fabric or sponge in a cylindrical shape, a blocking plate 69 made of a resin disc fixed to the lower end of the filter medium 68, and the upper end of the filter medium 68. And the resin mounting portion 70. The blocking plate 69 is for preventing the dampening water from passing through the filter medium 68 from the lower end of the filter medium 68 to the central space. The attachment portion 70 has a convex shape, and a screw portion that is screwed into the screw groove of the attachment recess portion 64 is provided at an upper end portion thereof.

  As shown in FIG. 2, the intermediate tank 20 having the above-described configuration includes a cylinder 36 of stirring means that is a load part, an air compressor 41 and open / close valves 42A and 42B that constitute foreign matter discharge means, and a pump 59 that constitutes drainage means. The drive motor 59a is controlled in accordance with a preset program by the microcomputer 71, which is a control means. The microcomputer 71 controls the entire dampening water circulation supply device that is ancillary equipment of the offset printing machine including the intermediate tank 20 and the cooling circulation tank 13 shown in the conventional example.

  Specifically, when the operator operates the offset printing machine to start printing, the microcomputer 71 always supplies the dampening water to the water boat 9 while controlling the amount and temperature of the dampening water in the cooling circulation tank 13. Supply. Further, the dampening water that has been drained and purified from the water boat 9 is supplied to the cooling circulation tank 13 based on the detection status of the water level sensor 55. Further, the stirring member 32 is operated every predetermined time, and when the operation of the cleaning switch on the operation panel (not shown) by the operator is detected, the foreign matter deposited and deposited in the first water tank 24 is discharged.

  Next, the fountain solution purifying action in each of the filter parts 23, 43, 60 of the intermediate tank 20 will be specifically described.

  First, in the 1st filter part 23, dampening water is supplied from the water boat 9 by overflow. If it does so, dampening water will flow in from the 1st water intake 26 of the 1st water tank 24, and will be drained by overflow from the upper 1st drain outlet 29 by the dead weight by the height difference with the water boat 9. FIG. In the meantime, when passing between the granular members 31 floating in a stacked state on the upper part of the first water tank 24, the foreign matter contained in the dampening water adheres to the surface of the granular members 31.

  In the second filter unit 43, dampening water is supplied from the first filter unit 23 by overflow. Then, in the fountain solution, the bubbles that have not been removed by the first filter portion 23 are removed, the oil and fine foreign matters are adsorbed by the adsorbing member 53, and the first water passage portion 48A of the first fountain solution passage 47A. It is dripped. And the dampening water of 49 A of 2nd water flow parts is pushed up by gravity of the dampening water stored in the 1st water flow part 48, and the 1st water flow part 48B of the 2nd dampening water flow path 47B is overflowed by overflow. To be supplied. Meanwhile, the oil that has not been adsorbed by the adsorbing member 53 floats on the water surface of the first water passing portion 48A, and the foreign matter having a specific gravity higher than that of the dampening water continues between the first water passing portion 48A and the second water passing portion 49A. It settles in the bottom of 47 A of 1st dampening water flow paths which are a part. Then, the water supply and the cleaning due to the overflow are repeated in the second dampening water flow path 47B and the third dampening water flow path 47C, and from the second water flow portion 49C of the third dampening water flow channel 47C to the water storage portion 54. Stored in the water. Further, the dampening water stored in the water storage section 54 is drained (supplied) to the third filter section 60 by operating the pump 59 based on the detection state by the water level sensor 55.

  Further, in the third filter unit 60, dampening water is supplied from the second filter unit 43 at a predetermined pressure by the pump 59. Then, the fountain solution passes from the outer periphery of the filter medium 68 inward in the radial direction, and fine foreign matters that have not been removed by the first and second filter portions 23 and 43 are removed. Then, only the dampening water that has passed through the filter medium 68 is supplied from the internal space of the filter medium 68 to the cooling circulation tank 13 on the downstream side through the third drainage port 65.

  Next, the control of the intermediate tank 20 by the microcomputer 71 will be specifically described.

  In the intermediate tank control process, as shown in FIG. 3, the microcomputer 71 first starts a drive timer that is a cycle for operating the cylinder 36 constituting the stirring means of the first filter unit 23 in step S <b> 1. Next, in step S2, it is detected whether or not the drive cycle for operating the cylinder 36 has elapsed based on the time measured by the drive timer. If the drive cycle has elapsed, the process proceeds to step S3, and if the drive period has not elapsed, the process proceeds to step S5.

  In step S3, in order to measure the period for operating the cylinder 36 next, the drive timer is reset and started again, and then in step S4, the agitation process is executed and the process proceeds to step S5.

  In step S5, it is detected whether or not the pump 59 of the second filter unit 43 is operating. If the pump 59 is not operating, the process proceeds to step S6. If the pump 59 is operating, the process proceeds to step S8.

  In step S6, whether or not the water level in the water storage section 54 has reached the upper limit (see FIG. 5A) is detected based on whether or not the electrodes 56A and 56C of the water level sensor 55 are in a short circuit state. If the upper limit is detected, the process proceeds to step S7, the operation of the drive motor 59a of the pump 59 is started (turned on), and the process proceeds to step S8. On the other hand, when not detecting the upper limit of the water level in the water storage part 54, it progresses to step S10.

  In a state where the pump 59 is operating, the water level in the water storage section 54 is set to a lower limit (see FIG. 5B) depending on whether or not the electrodes 56A and 56B of the water level sensor 55 are in a non-shorted state in step S8. Detect whether it has been reached. If the lower limit is detected, the process proceeds to step S9, the operation of the drive motor 59a of the pump 59 is stopped (turned off), and the process proceeds to step S10. On the other hand, if the lower limit of the water level in the water reservoir 54 is not detected, the process proceeds to step S10 as it is.

  In step S10, it is determined whether a cleaning operation of the first water tank 24 by the operator has been detected. And when cleaning operation is detected, it progresses to Step S11, drainage processing of the 1st filter part 23 is performed, and it returns to Step S2. On the other hand, when the cleaning operation is not detected, the process directly returns to step S2.

  In the agitation processing in step S4, the agitating member 32 is moved up and down for a predetermined time (about 15 seconds) by operating the cylinder 36. And when this stirring process is performed, in the 1st water tank 24, as shown to FIG. 4 (A), the granular member 31 which floats on the upper side of the dampening water currently stored inside will be inside. Scattered. At this time, coarse foreign matter adhering to the surface of the granular member 31 is separated. Then, when the operation of the cylinder 36 is stopped, the foreign matter having a high specific gravity away from the granular member 31 is deposited on the bottom of the first water tank 24 as shown in FIG. This precipitation of foreign matter occurs not only in the discharge port 37 but also in the discharge pipe portion 40 from the connecting pipe portion 39 of the foreign matter discharge pipe 38. Further, at the end of stirring, the granular member 31 positioned below the disc portion 34 of the stirring member 32 floats above the first water tank 24 through the insertion hole 35.

  In the discharging process in step S11, the air compressor 41 is always operated, and first the second on-off valve 42B is opened, and then the first on-off valve 42A is opened. Then, when a predetermined time (about 1 second) elapses, the on-off valves 42A and 42B are closed. When this discharge process is executed, in the foreign matter discharge pipe 38, the compressed air from the air compressor 41 passes through the discharge pipe section 40 extending linearly and is discharged from an end (not shown) of the discharge pipe section 40. The At this time, the first water tank 24 communicating with the discharge pipe portion 40 via the connection pipe portion 39 is sucked toward the discharge pipe portion 40 due to a pressure difference with the discharge pipe portion 40. Works. As a result, the foreign matter deposited on the bottom of the first water tank is sucked and automatically discharged to the outside of the intermediate tank 20 through the foreign matter discharge pipe 38.

  Thus, in the intermediate tank 20 of the present invention, the first filter unit 23 floats in the dampening water with respect to the first water tank 24 that takes in the dampening water from the water boat 9 from the lower part and discharges it from the upper part. Since a large number of granular members 31 are disposed, foreign matter such as ink lump or paper powder contained in the fountain solution passed through the first water tank 24 adheres to the surface of the granular member 31. Can be removed. And since the dampening water in this 1st water tank 24 does not stay at the time of the printing by an offset printing machine, and is always a water flow state, dampening water does not deteriorate with the separated foreign material.

  In addition, the first filter portion 23 is provided with a stirring member 32 that stirs the granular member 31 and the dampening water, and the stirrer 32 is operated to separate the foreign matter attached to the granular member 31, thereby It can be precipitated at the bottom of the water tank 24. And since it has constituted so that the settled foreign material which leads to deterioration of this dampening water can be automatically discharged by operating air compressor 41 which constitutes a foreign material discharge means, it is controlled reliably. In addition, the cleaning workability can be improved.

  The second filter unit 43 includes a first water flow part 48A to 48C that takes dampening water from the upper part into the second water tank 44, and a lower part that communicates with the first water flow parts 48A to 48C. Since the substantially U-shaped first to third dampening water channels 47A to 47C composed of the second water passage portions 49A to 49C draining from the upper part are provided, the dampening water flowing through the dampening water channel 47 is provided. The bubbles contained in the water can be surely eliminated. In addition, foreign matters having a low specific gravity such as oil and ink components can be separated on the water surface of the first water passing portion 48, and foreign matters having a high specific gravity such as ink mass and paper powder can be separated and settled at the bottom communicating portion. . And since the dampening water in the 2nd water tank 44 does not stay at the time of the printing by an offset printing machine like the 1st filter part, it always becomes a water flow state, Therefore There is no deterioration.

  Moreover, the second filter unit 43 is provided with a water storage unit 54 further downstream of the third fountain solution channel 47C located on the most downstream side, and a pump 59 that is a drainage means is provided according to the detection status of the water level sensor 55. Operate and drain to the third filter unit 60. Specifically, the pump 59 is operated when the preset upper limit is reached, and the pump 59 is stopped when draining to the lower limit. Therefore, it is possible to prevent the pump 59 from causing malfunction such as bubble trapping. As a result, it is possible to prevent a failure caused by the pump 59 sucking air (bubbles).

  Furthermore, in this embodiment, since the third filter part 60 having the cartridge type filter member 67 that can be replaced on the most downstream side is further provided, the first and second filter parts 23 and 43 cannot be separated. Small foreign matter can be reliably separated.

  Therefore, in the dampening water circulation device to which the intermediate tank 20 of the present invention is applied, the foreign matter contained in the dampening water can be sufficiently removed, so that the dampening water can be reliably extended in life. As a result, the number of operations for exchanging all the dampening water regularly can be reduced, and the number of cleaning of the intermediate tank 20 itself can be reduced.

  In order to confirm the effects of the first filter portion 23 and the second filter portion 43 in the embodiment, the inventors conducted an experiment in a state where the filter member 67 of the third filter portion 60 was removed. In this experiment, 15 liters of dampening water contaminated by printing was prepared in a temperature atmosphere of about 20 ° C., and the suspended solid amount SS after passing through the intermediate tank 20 at 5 liters / minute. And the amount of the normal hexane extractable substance. The first water tank 24 has a diameter of about 160 mm and an overall height of about 150 mm. The interior of the first water tank 24 was filled with a granular member 31 having a diameter of 2 mm at 50% of the volume. The experimental results are shown below.

  As shown in Table 1, in the first experiment, a first dampening solution with a suspended solid amount SS measured before treatment of 140 mg / L and a normal hexane extract of 6 mg / L was used. When water was measured, the suspended matter amount SS was removed to 20 mg / L, and the normal hexane extract was removed to less than 1 mg / L. Further, in the second experiment, when the dampening water after the treatment is measured using the second dampening water whose suspended solid amount SS measured before the treatment is 27 mg / L and the normal hexane extract is 21 mg / L. The suspended solid amount SS was removed to 11 mg / L, and the normal hexane extractable substance was removed to less than 13 mg / L.

  As can be seen from these experimental results, in the intermediate tank 20 of the present invention, a sufficient cleaning (foreign matter separation) effect can be obtained with only the first and second filter portions 23 and 43, and the third filter portion 60 is If provided, a higher effect can naturally be obtained.

  In addition, the intermediate tank 20 of the dampening water circulation supply apparatus of the present invention is not limited to the configuration of the above-described embodiment, and various modifications are possible.

  For example, in the above-described embodiment, the stirring means mounted on the first filter unit 23 is configured by the stirring member 32 that is operated by the driving means. However, the stirring means 32 is supplied with air or stirred by a blade that is rotated by the driving means. Various modifications are possible.

  Moreover, in the 2nd filter part 43, although the 3 dampening water flow paths 47A-47C were provided, the number may be one and conversely, 4 or more may be provided.

  Furthermore, in the embodiment, the means for automatically discharging the precipitated foreign matter is provided only in the first water tank 24, but it may be provided in the second water tank 44 as well. In this case, it is preferable to connect the connecting pipe portion 39 of the foreign matter discharge pipe 38 to the bottom of each of the dampening water flow paths 47A to 47C.

  Furthermore, in the above-described embodiment, the stirring member 32 as the stirring means is operated every predetermined time, and the on-off valves 42A and 42B of the air compressor 41 as the foreign matter discharging means are operated according to instructions from the operator. Various changes can be made to the timing. For example, the offset printing machine needs to clean the blanket cylinder 3 that prints directly on paper according to time or the number of printed sheets, and the circulation supply control by the dampening water circulation device is also stopped during the blanket cleaning. . For this reason, when it is detected that the operator has performed an operation to execute this blanket cleaning, the agitation process by the agitation unit may be performed, and then the discharge process by the foreign matter discharge unit may be executed after a predetermined time.

  In the embodiment, the three types of filter parts 23, 43, and 60 are mounted. However, the three types of filter parts 23, 43, and 60 are not necessarily provided, and may be configured by only the first filter part 23 or only the second filter part 43. In addition, only the combination of the first filter unit 23 and the second filter unit 43, only the combination of the first filter unit 23 and the third filter unit 60, or the second filter unit 43 and the third filter unit 60. You may comprise only with the combination. Even if it does in this way, compared with the past, a cleaning effect can be improved reliably and the lifetime of dampening water can be prolonged.

It is sectional drawing which shows the intermediate | middle tank of the dampening water circulation apparatus which concerns on embodiment of this invention. It is a block diagram which shows the structure of the dampening water circulation apparatus. It is a flowchart which shows control of the intermediate tank by a microcomputer. (A), (B) is sectional drawing which shows the effect | action by the stirring process of a 1st filter part. (A), (B) is sectional drawing which shows the operation | movement by the drainage means of a 2nd filter part. It is the schematic which shows the structure of an offset printing machine and the dampening water circulation supply apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 9 ... Water boat 9a ... Connection part for drainage 9b ... Connection part for water supply 20 ... Intermediate tank 23 ... 1st filter part 24 ... 1st water tank 26 ... 1st water inlet 29 ... 1st water outlet 31 ... Granular member 32 ... Stirring member 38 ... Foreign matter discharge pipe 41 ... Air compressor (air supply means)
42A, 42B ... open / close valve 43 ... second filter portion 44 ... second water tank 47A-47C ... dampening water flow path 48A-48C ... first water passage portion 49A-49C ... second water passage portion 52 ... second water inlet 54 ... Reservoir 55 ... Water level sensor (water level detection means)
57 ... Second drainage port 59 ... Pump (drainage means)
60 ... 3rd filter part 61 ... 3rd water tank 62 ... 3rd water inlet 65 ... 3rd drain port 67 ... Filter member 71 ... Microcomputer (control means)

Claims (8)

Disposed below the water boat that stores dampening water that immerses a part of the water supply roller of the offset printing press, regenerates the dampening water drained from the water boat, and circulates and supplies the water to the water boat In the intermediate tank of the dampening water circulation supply device,
A water tank in which the lower part is connected to the connection part for draining the dampening water from the water boat, and the upper part is connected to the connection part for supplying the dampening water to the water boat,
An intermediate tank of a dampening water circulation supply device, comprising: a plurality of granular members arranged in the water tank and floating in the dampening water. Humidity that is disposed below the water fountain that stores dampening water that immerses a portion of the water supply roller of the offset printing press, and filters the dampening water drained from the water fountain and circulates it to the water fountain. In the intermediate tank of the circulating water supply system,
A first water-flowing portion extending downward and having an upper portion connected to the connection portion for draining the dampening water from the water boat, and a lower end communicated with the first water-flowing portion. A dampening water flow path having a substantially U shape having a second water passage portion extending upward for passing the dampening water is provided on the side of the connecting portion for supplying dampening water to the water boat. An intermediate tank of a dampening water circulation supply device. Humidity that is disposed below the water fountain that stores dampening water that immerses a portion of the water supply roller of the offset printing press, and filters the dampening water drained from the water fountain and circulates it to the water fountain. In the intermediate tank of the circulating water supply system,
A first filter portion connected to the side of the connecting portion for draining dampening water from the water boat; and a side of the connecting portion for supplying dampening water to the water boat while being connected to the first filter portion A second filter part connected to the
The first filter part is
A first water tank whose lower part is connected to the side of the connecting part for draining dampening water from the water boat, and whose upper part is connected to the second filter part;
A plurality of granular members arranged in the first water tank and floating in the fountain solution;
The second filter part is disposed inside the second water tank.
The 1st water flow part by which the upper part was connected to the 1st water tank of the said 1st filter part, and the connection part for water supply of the dampening water to the said water boat where a lower end connected to this 1st water flow part An intermediate tank of a dampening water circulation supply apparatus, comprising a substantially U-shaped dampening water flow path having a second water passage portion extending upwardly through which dampening water flows.   The intermediate tank of the dampening water circulation supply device according to claim 1 or 3, wherein stirring means for stirring the granular member and dampening water is provided.   A second dampening water flow path having a substantially U-shape having a first water flow section and a second water flow section is provided on the downstream side of the second water flow section in the dampening water flow path, and is provided in the water flow tank. The intermediate tank of the dampening water circulation supply device according to claim 2 or 3, wherein two or more dampening water flow paths are provided.   A water storage part having an upper end communicating with the second water flow part is further provided on the downstream side of the dampening water flow path, and a water level detection unit is provided in the water storage part. When a preset amount of water is stored, The intermediate tank of the dampening water circulation supply device according to any one of claims 2, 3, and 5, wherein dampening water is drained to a side of the water supply connecting portion to the water boat.   The dampening water circulation according to any one of claims 1 to 6, further comprising a filter unit provided with a filter medium on a side of the connecting portion for supplying dampening water to the water boat. Intermediate tank of feeding device.   A foreign matter discharge pipe is connected to the bottom of the water tank, and an air supply means for supplying air at a predetermined pressure is provided upstream of the foreign substance discharge pipe. The intermediate tank of the dampening water circulation supply device according to any one of claims 1 to 7, wherein an open / close valve is provided in front and back.

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