JP4066010B2 - Over-emulsifying / over-printing ink removal device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an auxiliary device for a printing machine that eliminates ink color spots (stains) generated on printed matter.
[0002]
[Prior art]
The present inventor includes a doctor roll that contacts the printing roll, a doctor blade that makes line contact with the peripheral surface of the doctor roll, and a driving means that drives the doctor blade together with the doctor roll in a direction crossing the axis. Are developed, and Japanese Patent Application Laid-Open No. 8-183168 (Japanese Patent No. 2727302), Japanese Patent Application Laid-Open No. 2000-255541 (Japanese Patent No. 3013312), Japanese Patent Application Laid-Open No. 9-254362 (Japanese Patent No. 2896434), and Japanese Patent Application Laid-Open No. 2896434. -225419 (Japanese Patent No. 2,936,413). The present inventor has also developed a split ink calling roll for supplying ink by partially changing the ink supply amount in accordance with the arrangement of the image area on the printing plate, as disclosed in JP-A-11-320840 and JP-A-2000-255038. (Patent No. 3136484). Furthermore, the present inventor has developed a swing roll that eliminates the variation in the thickness of the ink film on the peripheral surface of the printing roll due to the difference in the ink consumption according to the arrangement of the image area on the printing plate. 4-94991 (Japanese Patent No. 2946234) and JP-A-2000-39856 (Japanese Patent No. 3013303).
[0003]
Color spots (stains) in ink on printed matter often occur due to variations in the amount of ink supplied to the plate surface and the amount of humidified water supplied. The divided ink calling roll disclosed in JP-A-11-320840 and the swing roll disclosed in JP-A-4-94991 serve as means for eliminating variations in the supply amount of ink and moisture. The color spots (stains) of the inks have not been completely eliminated. The doctor-equipped cleaning device disclosed in JP-A-8-183168 is means for wiping off ink remaining in the printing machine at the end of the printing process and cleaning the printing machine, and the roll peripheral surface during printing by the doctor blade. The ink coating cannot be made uniform.
[0004]
In order to investigate the cause, when looking at the printed matter with color spots (stains), the side edge part of the printed matter or the outside of the printing plate side edge where no ink is consumed and the printing plate side edge where ink is consumed Like the inside, the non-image area where ink is not consumed and the image area where ink is consumed are adjacent to each other in the axial direction of the printing roll, and the ratio between the non-image area and the area area adjacent to each other. Color spots (dirt) can be seen in the areas where changes greatly. Also, when looking at the printing process, in the portion where the ratio of the non-image area and the image area that are adjacent to each other in the axial direction of the printing roll changes greatly, the difference in consumption of ink and moisture The thickness of the ink film on the roll peripheral surface varies, and the ink reservoir with thick ink film is generated between the rolls at the part corresponding to the non-image area where the ink is excessively supplied compared to the amount consumed. Therefore, the ink is excessively kneaded and becomes over-emulsified (emulsified). In particular, in a printing press equipped with a humidifying device, excess water and ink reversely transferred from the plate surface are kneaded and an over-emulsification phenomenon easily occurs. It has been found that the excessive emulsification locally reduces the viscosity and concentration of the ink, which causes color (brightness, saturation, hue) spots (stains) on the printed matter.
[0005]
The color spots (stains) are not completely eliminated by the divided ink calling roll or the swinging roll, and when the over-emulsification phenomenon occurs or when the ink is excessively supplied (too much discharge), the printing roll is washed again, or the roll Wipe over-emulsified and excess ink with rolled paper and supply fresh ink with no stains. However, the printing efficiency decreases due to the time loss due to ink wiping off after printing is interrupted, and a large amount of printing loss occurs until the start-up after printing resumes and the yield of printed materials decreases. The cost increases, and the disposal (discarding) of the printing loss becomes troublesome.
[0006]
Therefore, the present inventors have created an over-emulsification / over-printing ink removal device that removes over-emulsification / excess ink without interrupting printing at the initial stage when excessive ink supply (too much discharge) or over-emulsification occurs. The patent application was filed with Japanese Patent Application No. 2002-079999.
[0007]
The over-emulsification / excess printing ink removal device (hereinafter referred to as the prior application device) according to Japanese Patent Application No. 2002-079999 is an auxiliary device mounted on a printing press in order to eliminate color spots (dirt) in printed matter. , A doctor roll that contacts the transfer roll that forms an ink transfer path from the ink fountain to the plate cylinder, a doctor blade that makes a line point contact with the peripheral surface of the doctor roll, and The doctor blade is equipped with doctor drive means for driving the blade edge of the doctor blade in two directions, a parallel direction parallel to the axis of the doctor roll and a transverse direction crossing the axis of the doctor roll. Is shorter than the dimension (width) in the axial center of the peripheral surface of the doctor roll.
[0008]
When this prior application device is applied to a printing machine, the doctor blade is moved and positioned to the location where the over-emulsification phenomenon occurs in the initial stage of the ink over-emulsification phenomenon that occurs during the printing operation, and the doctor blade is placed on the doctor roll. The over-emulsified and excess ink that moves in the transverse direction of the shaft core and adheres to the transfer roll can be wiped off by the doctor blade via the doctor roll, so there is no need to interrupt printing and color spots (stains) The printed matter can be obtained efficiently.
[0009]
[Problems to be solved by the invention]
In this prior application device, the doctor roll (12) is brought into contact with the transfer roll (35) of the printing press main body, and the doctor blade (13) having a shorter width than the doctor roll is moved parallel to the axis of the doctor roll. Depending on the width of the transfer roll of the printer body to be applied, several types of doctor rolls with different widths must be prepared, and when attaching to the printer body, the doctor roll bearing must be installed. It must be attached to the frame of the printer body. However, when several types of doctor rolls having different widths are prepared, the amount of the stock rolls increases, resulting in an increase in cost. Depending on the printing press, there may be no space for mounting the doctor roll bearings on the frame. In addition, the ink coating on the peripheral surface of the doctor roll of the prior application device is the amount of ink lost that is not used for printing and wiped off at the end of printing. In the case where no excessive emulsification and excessive ink are generated due to the arrangement of the ink, there is no ink loss. Similarly, when the width of the doctor roll is the same as the width of the transfer roll of the printing press, the ink is wiped off from the area where the transfer roll is not excessively emulsified and excessive ink is generated, so the ink loss is reduced. Become more.
[0010]
OBJECT OF THE INVENTION
Accordingly, the present invention provides an over-emulsification / over-printing ink removing device that can be easily applied to any existing printing press having a different width and does not cause an increase in ink loss due to the application. With the goal.
[0011]
[Means for Solving the Problems]
The over-emulsifying / over-printing ink removing apparatus according to the present invention includes a main carrier 20 on which a doctor roll 12 and a doctor blade 13 in contact with the peripheral surface of the doctor roll are mounted, and a main carrier parallel to the axis 15 of the doctor roll. The doctor roll 12 and the doctor blade 13 are mounted on the main carrier 20 so as to be movable in a direction crossing the axis of the doctor roll, and the effective length W of the guide rail 22 is The width L of the doctor roll 12, the width H of the doctor blade 13, and the width N of the main carrier 20 in the direction parallel to the axis 15 of the doctor roll are at least twice the widths H, L, and N. First feature.
[0012]
The second feature of the over-emulsifying / overprinting ink removing device according to the present invention is that, in addition to the first feature, a sub carrier 27 having a doctor roll 12 and a doctor blade 13 mounted on the main carrier 20 is provided with a doctor roll. It is in the point which is mounted so that movement in the direction which crosses the axis of this is possible.
[0013]
A third feature of the over-emulsifying / over-printing ink removing apparatus according to the present invention is that a main drive for driving the main carrier 20 in the length direction of the guide rail 22 in addition to any of the first and second features. Means 21 and sub driving means for driving the sub carrier 27 in a direction crossing the axis of the doctor roll are provided.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
The movement of the main carrier 20 on the guide rail 22, the movement of the doctor roll 12 and the doctor blade 13 in the transverse direction of the axis 15 from the main carrier 20, and the transverse direction of the axis 15 of the auxiliary carrier 27. The movement may be manual, that is, manually operated, or automatically operated by an air cylinder 25, screw bolt 21, rodless cylinder, linear motor, winding power transmission device, solenoid valve (solonoid), or the like. It may be due to. The movement of the sub-carrier 27 mounted on the main carrier 20 in the transverse direction of the axis 15 is due to linear or curved movement along the guide rails 26A and 26B provided between the main carrier 20 and the sub-carrier 27. Alternatively, it may be based on a swinging (rotating) motion of a swinging arm (not shown) connecting the main carrier 20 and the subcarrier 27.
[0015]
1 to 3 illustrate an over-emulsifying / over-printing ink removing apparatus that is automatically operated. The doctor roll 12 and the doctor blade 13 are mounted on a subcarrier 27 mounted on the main carrier 20, and are reciprocally driven in the transverse direction of the shaft core 15 together with the subcarrier 27. An air cylinder 25 connects the main carrier 20 and the subcarrier 27. The main carrier 20 and the sub-carrier 27 are provided with guide rails 26A and 26B that are fitted to each other, and when the air cylinder 25 is operated, the doctor roll 12 and the doctor blade 13 are integrated with the sub-carrier 27. And reciprocate in the transverse direction of the shaft core 15. On the upper side of the main carrier 20, a pair of arms 19, 19 are projected in the length direction of the shaft core 15 at a constant interval (M). The arms 19 and 19 are provided with through holes 18 and screw holes 23 at two positions in the front and rear, and guide rails 22 and screw bolts 21 arranged in parallel to the shaft core 15 pass through the guide rails 22 respectively. The screw bolts 21 are fitted into the holes 18 and screwed into the screw holes 23, respectively, and penetrate the holes (13 and 23), respectively. For this reason, when the screw bolt 21 rotates, the main carrier 20 is guided to the guide rail 22 and reciprocated in the length direction of the shaft core 15.
[0016]
The over-emulsifying / excess printing ink removing device is installed in the printing machine with the doctor roll 12 facing the transfer roll 35. The main carrier 20 moves, and the doctor roll 12 is pushed together with the sub-carrier 27 from the main carrier 20 and contacts the transfer roll 35 toward the transfer roll 35 at the position where the main carrier 20 is generated. The over-emulsified / excess ink is wiped off from the transfer roll 35 by the accompanying drive, and the over-emulsified / excess ink transferred by wiping off is scraped off from the doctor roll 12 by the doctor blade 13 to the ink tray 39. Removed. The rotation of the doctor roll 12 may be driven by positive rotation by a motor or the like mounted on the main carrier 20 in addition to contact rotation (accompaniment driving) by the transfer roll 35 that is in contact therewith.
[0017]
The excessive emulsification of the ink is caused by the reverse transfer of excess moisture generated on the plate surface from the plate cylinder 11 to the ink transfer path, or the thickness of the ink film on the peripheral surface of the transfer roll due to the difference in the partial ink consumption on the plate surface. Occurs due to variation. For this reason, the ink overemulsification / overprinting ink removing device is preferably applied to a transfer roll located at a position close to the plate cylinder 11 in an ink transfer path from the ink fountain to the plate cylinder. FIG. 3 shows an offset printing machine having a humidifying roll 16, and includes a first transfer roll 31, a call roll 30, a second transfer roll 32, a third transfer roll 33, a first transfer roll 31, a fountain roll 29 constituting an ink fountain. Ink is supplied to the plate cylinder 11 through the four transfer rolls 34, the fifth transfer rolls 35A and B, the sixth transfer rolls 36A and B, and the seventh transfer rolls 37A1, A2, B1, and B2, and the printed matter through the blanket cylinder 38. Is printed on. In this printing machine, the fifth emulsifying / excess printing ink removing device is applied to the fifth transfer roll 35. Reference numeral 39 denotes an ink tray that receives over-emulsification / excess ink.
[0018]
Usually, the fourth transfer roll 34 is called a kneading roll, the fifth transfer roll 35 is called a transfer roll, and the seventh transfer roll 37 is called an ink foam roll. When the over-emulsification / excess printing ink removing apparatus starts to operate, instantaneous unevenness is likely to occur in the ink film of the fifth transfer roll 35 in contact with the doctor roll 12 due to the pulsation accompanying the start-up. Such irregularities are wiped off instantaneously, but in order to avoid printing spots due to the irregularities, the second sixth transfer roll 36 from the plate surface 11 that does not directly touch the plate surface, or the third transfer roller 36 as shown in FIG. It is advisable to apply an over-emulsification / over-printing ink removing device to the fifth transfer roll (transfer roll) 35.
[0019]
In a printing machine where the ink transfer path branches in the process from the ink fountain to the plate cylinder, the transfer roll 35A constituting the ink transfer path (35A, 36A, 37A1) that first touches the plate surface (11) in the direction of rotation of the plate cylinder. An over-emulsifying / over-printing ink removing device may be applied. This is because surplus ink and water adhering to the plate surface (11) after transfer to the blanket cylinder 38 is more in contact with the ink transfer path (35A, 35B, 37B2) than the other ink transfer paths (35B, 36B, 37B2). 36A / 37A1) reversely transfer to the first ink transfer path (35A / 36A / 37A1) that is first touched, and an excessive emulsification phenomenon is likely to occur. If the ink removing device is applied, the over-emulsification phenomenon in other ink transfer paths (35B, 36B, 37B2) can be suppressed. Further, even when the ink film of the transfer roll 35 in contact with the doctor roll 12 is instantaneously uneven at the time of starting the over-emulsification / excess printing ink removing apparatus, the unevenness of the ink film remains in the plate surface (11 If the ink transfer path (35B, 36B, 37B2) that touches the last is not generated, there is no particular problem.
[0020]
As shown in FIG. 3, in the offset printing machine provided with the humidifying roll 16, the over-emulsifying / excess printing ink removing device can be applied to the humidifying roll 16. The over-emulsification / excess printing ink removing apparatus that automatically operates the doctor driving means is appropriately provided with an optical sensor for detecting over-emulsification / excess ink and ink reservoir generated in the ink film of the transfer roll 35.
[0021]
In consideration of the abrasion caused by the doctor blade (metal blade), the doctor roll 12 has a harder peripheral surface than the transfer roll 35 having a peripheral surface made of rubber or other elastomer, and has excellent wear resistance. A steel roll, a chrome plating roll, a ceramic coating roll or the like may be used. Since over-emulsification of ink is likely to occur at both ends of the transfer roll 35 adjacent to the outside of the printing plate side edge where no ink is consumed, the main carrier 20 has a wide printing machine at a total of at least two of the both ends. Then, it is good to arrange | position at a total of at least 3 places of both ends 2 places and 1 center part, and, by doing so, after detecting a hyperemulsification phenomenon, the movement distance and movement of the main carrier 20 moved to the generation | occurrence | production location The time is shortened, and the excessive emulsification / excess printing ink can be instantaneously removed, and a printed matter free from color spots (stains) can be obtained efficiently. As described above, in the printing machine, when the main carrier 20 is arranged at a total of three locations including two ends or one central portion, the effective length W of the guide rail 22 is made equal to the width of the transfer roll 35, The width L of the doctor roll 12, the width H of the doctor blade 13, and the width N of the main carrier 20 are preferably set to a quarter or less of the effective length W of the guide rail 22. Specifically, the width (H, L, N) of the doctor roll 12, the doctor blade 13, and the main carrier 20 may be about 20 to 40 cm.
[0022]
【The invention's effect】
The over-emulsification / excess printing ink removing apparatus of the present invention (Claim 1) cuts the guide rail 22 as necessary, matches the effective length W of the guide rail 22 with the width of the transfer roll of the printing press, and a doctor roll. 12 is attached to the printing press in contact with the transfer roll. Since the width L of the doctor roll 12 is less than half of the effective length W of the guide rail 22, in many cases, the width L of the doctor roll 12 is shorter than the width W of the transfer roll, and the doctor roll 12 becomes the transfer roll. It will contact only a part of the surface. However, since the doctor roll 12 and the doctor blade 13 are mounted on the main carrier 20 and are guided by the guide rails 22 to move in parallel with the transfer roll, the doctor roll 12 contacts the entire circumference of the transfer roll. Even if the ink is over-emulsified or excessive ink is generated in any part of the transfer roll, the over-emulsified / excess printing ink is scraped and removed by the doctor blade 13 via the doctor roll 12. Therefore, when the over-emulsifying / over-printing ink removing device is attached to the printing press, no inconvenience occurs even if the guide rail 22 is cut in accordance with the width of the transfer roll.
[0023]
On the contrary, the width L of the doctor roll 12 is made narrower than the width (W) of the transfer roll, and the doctor roll 12 is brought into contact with the transfer roll only when the over-emulsification phenomenon occurs. Compared with the prior application device (Japanese Patent Application No. 2002-079999) having the same width (W) as the transfer roll, the doctor roll 12 is always in contact with the transfer roll (Japanese Patent Application No. 2002-079999). The amount is small and economical.
[0024]
Furthermore, in the present invention (Claim 1), the guide rail 22 is cut and attached in accordance with the width of the transfer roll, and the doctor roll 12 and the doctor blade 13 are mounted on the main carrier 20 and moved for use. Therefore, it is only necessary to fix the guide rail 22 to the printing machine, and it is not necessary to attach the bearing of the doctor roll 12 to the printing machine. As a result, an over-emulsifying / over-printing ink removing device can be installed. It becomes easy to attach to the printing press. In addition, it is not necessary to prepare various types of over-emulsification / excess printing ink removing devices having different widths L, H, N of the doctor roll 12, the doctor blade 13 and the main carrier 20, and one type of over-emulsification / excess printing ink removal. The machine can handle various printing machines with different widths, the production cost of the over-emulsification / over-printing ink removal device is low, the stock burden is reduced, and the over-emulsification / over-printing ink removal device is economically provided. I can do it. The over-emulsifying / over-printing ink removing apparatus of the present invention is such that the guide rail 22 is appropriately cut in accordance with the width of the transfer roll and attached to the printing press. The “effective length W” of the guide rail 22 is as follows. Is the required length of the guide rail 22 that is required to cut and fit the width (W) of the transfer roll 35 of the main body of the printing machine and attach the over-emulsification / over-printing ink removing device to the printing machine. In the state where it is attached to the printing press, the “effective length W” of the guide rail 22 is the same as the width (W) of the transfer roll 35 of the attached printing press.
[0025]
In the present invention (Claim 2), since the doctor roll 12 and the doctor blade 13 are mounted on the subcarrier 27 and moved from the main carrier 20 to the transfer roll, the contact condition between the doctor roll 12 and the doctor blade 13 is changed. There is no need to make adjustments one by one, and the performance of the over-emulsifying / over-printing ink removing device is improved.
[0026]
In the present invention (Claim 3), since the doctor roll 12 and the doctor blade 13 are mounted on the main carrier 20 and the sub carrier 27 and automatically moved to the location where the hyperemulsification phenomenon occurs, the printing loss is reduced. Reduces printing efficiency.
[Brief description of the drawings]
FIG. 1 is a perspective view of an over-emulsifying / over-printing ink removing apparatus according to the present invention.
FIG. 2 is a perspective view of a sub-carrier of the over-emulsifying / over-printing ink removing apparatus according to the present invention.
FIG. 3 is a side view of a printing machine equipped with the over-emulsification / excess printing ink removing apparatus according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 11 Plate cylinder 12 Doctor roll 13 Doctor blade 15 Shaft core 16 Humidification roll 18 Through-hole 19 Arm 20 Main carrier 21 Main drive means (screw bolt)
22 Guide rail 23 Screw hole 25 Sub drive means (air cylinder)
26 Guide rail 27 Sub carrier 29 Fan ten roll 30 Call roll 31 First transfer roll 32 Second transfer roll 33 Third transfer roll 34 Fourth transfer roll (kneading roll)
35 Fifth transfer roll (transfer roll)
36 6th transfer roll 37 7th transfer roll (ink foam roll)
38 Blanket cylinder 39 Ink tray H Doctor blade width L Doctor roll width M Arm spacing N Main carrier width W Effective length of guide rail (transfer roll width)

Claims (3)

In the ink transfer path from the ink fountain to the plate cylinder , the doctor roll (12) and the doctor blade (13) which is installed in the printing machine facing the transfer roll located near the plate cylinder and is in contact with the peripheral surface of the doctor roll. ) And a guide rail (22) for guiding the main carrier (20) in parallel to the axis (15) of the doctor roll, the doctor roll (12) and the doctor blade (13). ) Is mounted on the main carrier (20) so as to be movable in the direction crossing the axis of the doctor roll, and the effective length (W) of the guide rail (22) is the width (L) of the doctor roll (12). And the width (H) of the doctor blade (13) and the width (N) of the main carrier (20) in the direction parallel to the axis (15) of the doctor roll. Der least twice N) is, is constituted by the peripheral surface of the transfer roll elastomer, a doctor blade is a metal blade, either the doctor roll is a steel roll, chrome plated roll, the ceramic coating roll, A hyper-emulsification / excess printing ink removing device in which the peripheral surface hardness of the doctor roll is harder than the peripheral surface hardness of the transfer roll .   The subcarrier (27) carrying the doctor roll (12) and the doctor blade (13) is mounted on the main carrier (20) so as to be movable in a direction crossing the axis of the doctor roll. Over-emulsification and excess printing ink removal equipment.   A main driving means (21) for driving the main carrier (20) in the length direction of the guide rail (22) and a sub driving means for driving the sub carrier (27) in a direction crossing the axis of the doctor roll are provided. The over-emulsifying / over-printing ink removing apparatus according to claim 1 or 2.

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