JP2715081B2 - Ink transfer roll swing control device - Google Patents

Description

Description: TECHNICAL FIELD OF THE INVENTION The present invention relates to an ink transfer for supplying an optimal ink by oscillating between an ink fountain roll and an ink kneading roll provided in an ink device of an offset rotary printing press. The present invention relates to a roll swing control device. [Prior Art] As is well known, an ink transfer roll of an offset rotary printing press oscillates between an ink discharge roll and an ink kneading roll by a driving force branched from a drive system for driving an ink roller group and the like to supply ink. Ink transfer equipment was used. As a result, the swing cycle of the ink roll increases in proportion to the printing speed, and the amount of ink supplied to the printing plate becomes excessive, making it difficult to supply the optimum ink and improving the printing quality. Was rare. In general, if the rotation cycle of the ink-discharge roll, the contact time of the ink-discharge roll, and the ratio of contact with the ink-kneading-roll are constant while keeping the swing cycle of the ink transfer roll constant, the ink supply amount is not optimal. Therefore, the ink supply amount on the printing plate is not optimal. In addition, the relationship between the printing speed and the swing cycle of the ink transfer roll is such that the time during which the ink transfer roll contacts the ink fountain roll and the ink kneading roll is constant, and the number of times the ink transfer roll oscillates in proportion to the printing speed. When the amount increases, the amount of ink supplied to the printing plate becomes excessive and the printing quality tends to deteriorate. [Problems to be Solved by the Invention] The present invention has been made in view of the above-described conventional technology, and an object thereof is to provide ink independent of a driving system for driving an ink roller group. A drive source for swinging the transfer roller is provided, and the drive force is used to pivotally support the ink transfer roll on a pair of swing arms capable of swinging about one fulcrum. By controlling the contact time of contact with the roll, based on the plate image area ratio for each color to be printed, and using the data in the paper quality and ink quality tables as correction values to control the rocking operation of the ink transfer roll The aim is to supply optimum ink and improve print quality. Further, the object of the present invention is to have the same configuration as the above-described ink transfer roll device, and to keep the contact time of the ink transfer roll in contact with the ink discharge roll and the ink kneading roll constant,
An object of the present invention is to provide an optimum ink supply by controlling a swing cycle by using a pattern area ratio as a parameter based on a printing speed and using data in a paper quality and ink quality table as a correction value to improve print quality. [Means for Solving the Problems] The swing control device for the ink transfer roll according to the present invention includes an ink transfer roll positioned between an ink discharge roll and an ink kneading roll, and the ink transfer roll is connected to a pair of swing arms. Supporting both ends, the swing arm is connected by a connecting shaft, and a direction switching valve that switches the operation of the air cylinder and the air cylinder connected to the swing arm,
In the ink transfer roll oscillating device configured to control the oscillating operation of the ink transfer roll that alternately comes into contact with the ink fountain roll and the ink kneading roll, detection for detecting a plate cylinder rotation speed of a printing press. Means, a pattern area ratio meter for obtaining a pattern area ratio of each color obtained by decomposing a print pattern to be printed on printing paper for each color, and a paper quality and ink quality table in which the paper quality and ink quality are predetermined. When,
A memory table that stores a function formula using the printing speed as a parameter and a relation between a contact time ratio and an average picture area ratio at which the ink transfer roll contacts the ink discharge roll and the ink kneading roll, and a plate cylinder rotation obtained from the detection unit. A calculation unit for calculating the contact time of the ink transfer roll from the memory table using the data in the paper quality and ink quality table as a correction value based on the number, and a solenoid of the direction switching valve via a timer based on the contact time And a control unit that controls the ON / OFF of the ink transfer roller and makes the number of swings of the ink transfer roll variable with respect to the plate cylinder rotation speed. The control device may further include a detection unit configured to detect a rotation speed of a plate cylinder drive system of the printing press in operation, and a pattern area of each color obtained by decomposing a print pattern to be printed on printing paper for each color. A picture area ratio meter for determining the rate, a function table that determines the paper quality and the ink quality, a memory table that stores the relational expression between the printing speed and the swing cycle of the ink transfer roll as an average picture area rate as a parameter, Based on the rotation speed obtained from the detection means, the printing speed, paper quality, and the data in the ink quality table are used as correction values to determine the swing cycle of the ink transfer roll. A calculation unit to be obtained and a control unit for controlling ON / OFF of a solenoid of the directional control valve via a timer based on the time of one cycle are provided. Note that the function formula can also be configured as follows. (1) The oscillation cycle in which the ink transfer roll makes contact with the ink discharge roll and the ink kneading roll and oscillates is fixed, and the relationship between the contact time ratio of the ink transfer roll and the average pattern area ratio is determined using the printing speed as a parameter. A plurality of linear function expressions are applied with a plurality of average picture area ratios as boundaries. (2) Assuming that the contact time for the ink transfer roll to oscillate in contact with the ink discharge roll and the ink kneading roll is constant, the relational expression between the printing speed and the oscillating cycle of the ink transfer roll is defined by using the average pattern area ratio as a parameter. A plurality of linear function expressions are applied at a plurality of printing speeds. As the control device, a control device with a built-in computer is desirable. [Operation] The printing speed is obtained from the rotation signal of the plate cylinder drive system detecting means. Next, the swing cycle of the ink transfer roll is controlled to be constant, a picture area ratio for each color is calculated by a picture area ratio meter, and stored together with the printing speed in a memory table. further,
A function formula of a picture area ratio and a contact time ratio and a coefficient b table representing paper quality and ink quality are stored. Then, from the printing speed, the pattern area ratio, and the correction coefficients of the paper quality and ink quality tables, the contact time during which the ink transfer roll contacts the ink discharge roll and the ink kneading roll is determined, and the solenoid of the directional control valve is turned ON / OFF via a timer. Control OFF. This control signal controls the directional control valve to supply the compressed air supplied from the pneumatic source to the piston side or rod side of the air cylinder. While maintaining the contact time, the ink is swung in a predetermined shaking cycle to supply an optimal ink. Another aspect of the invention is as follows.
The contact time of the ink transfer roll is fixed, and the swing cycle of the ink transfer roll is controlled. That is, the signal that has detected the plate cylinder rotation number is converted into a printing speed and stored in the memory table. This memory table stores a function formula of the relationship between the printing speed and the swing cycle of the ink transfer roll, using the picture area ratio as a parameter. The function formula stores the pattern area ratio as a coefficient. Based on this function formula, the swing cycle of the ink transfer roll is determined, and the time of one cycle corresponding to the swing cycle is further determined. Based on the time of the one cycle, the solenoid of the directional control valve is turned on via a timer. By controlling the / OFF control, the swinging operation of the ink transfer roll was controlled, and the optimum ink was supplied from the ink discharge roll to the ink mixing roll. Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Note that a microcomputer is used as the control device. First Example This example is an example in which the swing cycle of the ink transfer roll is fixed and the contact time of the ink transfer roll is controlled. FIG. 1 is a schematic view of a swinging device and swing control device of an ink transfer roll in an offset rotary printing press, and FIG. 2 is a perspective view of the swinging device of the ink transfer roll. In both figures, the ink in the ink fountain 1 contacts the ink fountain roll 2, and the ink on the outer circumference of the rotating ink fountain roll 2 is transferred to the rotating ink kneading roll 4 via the swingable ink transfer roll 3. Is configured to transfer. The ink transfer roll 3 is pivotally supported by a pair of swing arms 6 swingably supported by a connecting shaft 5, and the lower end of the swing arm 6 is engaged with a rod 7 a end of an air cylinder 7. On the piston side and rod side of this cylinder 7, 4
It is connected to a pneumatic source via a directional valve 8. The number of rotations of the plate cylinder drive system is detected by the proximity switch 10 and input to the control device 11 and stored. As shown in FIG. 3, the memory table 12 stores an optimum function table 12a, a function equation table 12b, a coefficient b table 12e, a paper quality and an ink quality table 12c. Function formula K = bS in function formula table 12b and coefficient b table 12
the data b _1, b _2, b ₃ of e, the printing speed as a parameter, the contact time of the ductor roll 3 in the case where the oscillating cycle is constant is determined. That is, the above relational expression K
= BS is the contact time ratio K as shown in FIG. 4 (where T ₁ is the time during which the ink transfer roller 3 is in contact with the ink discharge roller ₂ , T ₂ is the time during which the ink transfer roller 3 is in contact with the ink mixing roller 4) , the average image area ratio of the image area ratio measured by image area ratio meter 16 and an average (%) coefficient in. coefficient b table 12e showing the relationship between S b _1, b _2, b ₃ ... is determined by the printing speed The contact time ratio K (%) and the average picture area ratio S (%) are ratios when the capacity of the printing press is 100%.
In the ink quality table 12C, the coefficient b of the above relational expression K = bS
Correction value for correcting (coefficient determined by plate cylinder rotation speed)
C ₁ , C ₂ and C ₃ are stored. Reference numeral 13 denotes a timer for controlling contact times T ₁ and T ₂ during which the ink transfer roll contacts the roll. Numeral 14 denotes an arithmetic unit for performing arithmetic processing necessary for controlling the ink transfer roll. Reference numeral 15 denotes a control unit which processes a control signal of the ink transfer roll 3. Reference numeral 16 denotes a pattern area ratio meter, which obtains a pattern area ratio of each color obtained by decomposing a pattern to be printed on printing paper for each color. The rotation speed of the ink fountain roll 2 is assumed to increase in proportion to the printing speed, and is in a range where the ink transfer roll 3 can come into contact with the ink film of the ink fountain roll. The paper and ink quality table 12C is a newspaper,
Paper quality rank determined by coated paper, art paper, etc.
Stores data of contents which are coefficientized by a combination of ranks based on physical properties such as colors of ink, for example, red, blue, yellow and the like. This data is converted into a coefficient at the same level as the coefficient b, and is used as a value for correcting the coefficient b of the function equation K = bS. Next, the swinging operation of the ink transfer roll of the first embodiment will be described. The printing speed is obtained from the signal of the proximity switch 10 for measuring the rotation speed of the plate cylinder drive system. Next, the rotational speed of the ink transfer roll 3 is controlled to be constant, the picture area ratio of each color is calculated by a picture area ratio meter, the average picture area rate is calculated by a calculation unit, and stored together with the printing speed in a memory table. . Furthermore, the function formula of the average image area ratio and contact time ratio _{K (T 1 / T 2)} ( Figure 4)
And a printing speed coefficient b table 12e.
Then, based on the printing speed, the average pattern area ratio, and the paper quality and ink quality table 12c as correction values for the coefficient b, the contact time T ₁ , T _{2 for the} ink transfer roll 3 to contact the ink discharge roll 2 and the ink mixing roll 4. Ask for. Then, based on the contact times T ₁ and T ₂ , the ON / OFF control of the solenoid of the four-way switching valve 8 is performed via the timer 13. This control signal controls the four-way switching valve 8 to supply the compressed air supplied from the pneumatic source to the piston side or the rod side of the air cylinder 7 so that the ink transfer roll 3 comes into contact with the ink discharge roll 2. while maintaining the time T ₂ in contact with the time T ₁ and the ink distribution roll 4 which swings at a predetermined swing cycle, it is possible to supply an optimum ink. [Second embodiment] In this embodiment, the same ink transfer roll device as in the first embodiment is used, the contact time of the ink transfer roll 3 is kept constant, and the oscillation cycle of the ink transfer roll is controlled using the control device 11. Control. In FIG. 1, reference numeral 10 denotes a proximity switch for detecting the number of rotations of a plate cylinder of an operating printing press. A signal detected by the proximity switch 10 is processed into a printing speed V in a control device 11 and stored in a memory table 12. Is done. In the memory table 12, as shown in FIG. 5, the relationship between the printing speed (%) V and the ink transfer roll swing cycle (%) N is determined by optimizing the functional expression N = aV using the average picture area ratio S as a parameter. Customs table 12
memorized in b. The printing speed (%) and the oscillating cycle (%) are expressed as a ratio when the upper limit of the maximum printing speed V and the oscillating cycle N of the printing press is set to 100%. The above function N
= Coefficient of aV a _{is, a 1, a 2, a} 3 ... a wish from the coefficient a table 12d, transferred ink from the printing speed V and the coefficient a determining swing cycle N of the roll. The paper and ink quality table 12C is a newspaper,
Paper quality rank determined by coated paper, art paper, etc.
Stores data of contents that are converted into coefficients by a combination of ranks based on physical properties of ink colors such as red, blue, and yellow. This data is converted into a coefficient at the same level as the coefficient a, and is used as a value for correcting the coefficient a of the functional equation N = aV. Next, the swinging operation of the ink transfer roll of the second embodiment will be described. First, the printing speed V is obtained from the signal of the proximity switch 10. Then, the ink discharge roll 2 of the ink transfer roll 3
The timer 13 is set so that the contact times T ₁ and T ₂ between the ink and the kneading roll 4 become constant. Further, the pattern area ratio of the printing plate for each color measured by the pattern area ratio meter 16 is measured. For the pattern area ratio, the arithmetic unit 14 calculates an average pattern area ratio S, and further calculates an ink transfer swing cycle N (%) from the relationship between the plate cylinder printing speed V and the average pattern area ratio S.
From this swing cycle, the time of one cycle corresponding to the swing cycle is obtained, and the timer 13 and
ON / OFF the solenoid of the directional control valve 7 via the control unit 15
By controlling the swinging operation of the ink transfer roll 3 by controlling the
The optimal ink was supplied to the printer. [Third Embodiment] This embodiment is the same as the first embodiment in that the ink transfer device is controlled to swing using the ink roll device and the ink roll swing control device described in the first embodiment. In this embodiment, the contact time T ₁ , T ₂ is changed while the swing cycle of the ink transfer roll is kept constant, and the linear function K
= Performs optimal control of ink by combining a plurality of BS. That is, as shown in FIG. 6, a linear function K ₁ = B ₁ S ₁ , K ₂ = B ₂ S ₂ , K ₃ = B with a plurality of average picture area ratios S ₁ , S ₂ as a boundary.
₃ S ₃ is applied to form a relationship between the average picture area ratio S and the contact time ratio K. Then, the paper quality, the primary function equation K ₁ a correction coefficient in addition to the coefficients in the ink quality table 12C '= B _1'
Correction was made so that S ₁ , K ₂ = B ₂ ′ S ₂ , K ₃ = B ₃ ′ S ₃ , so that the contact time during which the ink transfer roll contacts the ink discharge roll 2 and the ink mixing roll 4 was controlled. [Fourth Embodiment] This embodiment is the same in that the ink transfer device is controlled to swing by using the ink roll device and the ink roll swing control device described in the second embodiment. In the present embodiment, the contact time T ₁ , T ₂ of the ink transfer roll is fixed, the swing cycle N is changed, and the optimal control of the ink is performed by combining a plurality of linear function expressions N = AV. That is, as shown in FIG. 7, a linear function N ₁ = A ₁ V ₁ , N ₂ = A ₂ V ₂ , N at a plurality of printing speeds (%) V ₁ , V _2.
Apply ₃ = A ₃ V ₃ to form the relationship between the swing cycle N and the printing speed V. Then, the correction coefficients C ₁ , C ₂ , and C ₃ in the paper quality and ink quality table 12c are added to the predetermined coefficients, and the above linear function expression
N ₁ ′ = A ₁ ′ V ₁ ′, N ₂ ′ = A ₂ ′ V ₂ ′, N ₃ ′ A ₃ ′ V ₃ ′, and the ink transfer roll 3 moves between the ink discharge roll 2 and the ink mixing roll 4. The swing time for swinging is controlled. In all of the first, second, third, and fourth embodiments, the ink discharge roller 2 is connected to the plate cylinder driving system such that the number of rotations slightly increases in proportion to the printing speed. Furthermore, in the case of a two-sided printing machine in which ink devices are provided above and below in the same printing unit during two-sided printing, if the swing cycle of the ink transfer roll 3 is the same, the impact force is simultaneously applied to the plate cylinder of the printing unit. May be added, and the two plate cylinders may resonate with each other to cause a bulge. Therefore, by providing the same pattern with a delay time to the contact time pattern, the ink transfer roll 3
A phase difference is given to the swing cycle of the above, so that the vibration is alleviated, thereby improving the print quality. [Effects of the Invention] As described above, according to the present invention, a drive source is provided independently of the drive system that drives the ink roller group, and this drive force allows a pair of rockers to swing about one fulcrum. By controlling the swing cycle of the ink transfer roll and the ink roll, which are pivotally supported by the swing arm, and controlling the swing of the ink transfer roll, the optimal ink for the ink transfer roll to the ink roll is controlled. Can supply the quantity,
Printing quality can be improved. Similarly, in the present invention, the ink transfer roll is brought into contact with the ink fountain roll and the ink kneading roll in an optimum swing cycle to supply the optimum ink, thereby improving print quality.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows a swing device and a swing control device for an ink transfer roll of an offset rotary printing press. 2 is a perspective view showing a swinging device of the ink transfer roll, FIG. 3 is a diagram showing details of the memory table 12 in FIG. 1, and FIGS. 4 and 6 are average picture area ratio S and contact time. FIGS. 5 and 7 show the relationship between the printing speed (%) V and the ink transfer roll swing cycle N. FIGS. 2: Ink ejection roll, 3: Ink transfer roll 4: Ink roll, 6: Swing arm 9: Plate cylinder drive system, 10: Proximity switch 11: Control device, 12: Memory table 13: Timer, 14 ... Calculation unit 15, Control unit, 16: Picture area ratio meter

Claims (1)

(57) [Claims] An ink transfer roll is located between the ink fountain roll and the ink kneading roll, and the ink transfer roll supports both ends on a pair of swing arms, and the swing arms are connected by a connecting shaft, and an air cylinder connected to the swing arm A swinging device for an ink transfer roll configured to control the swinging operation of the ink transfer roll, which alternately comes into contact with the ink discharge roll and the ink mixing roll, by a direction switching valve that switches the operation of the same air cylinder. A detecting means for detecting the number of rotations of the plate cylinder of the printing press; a pattern area ratio meter for determining a pattern area ratio of each color obtained by decomposing a printed pattern to be printed on printing paper for each color; Paper quality and ink quality table with predetermined ink quality stages, and ink transfer rolls shifted to ink delivery rolls and ink mix rolls. The paper quality is the printing speed of the relationship of the contact time ratio and the average image area ratio in contact with a memory table for storing a function formula as a parameter, based on the plate cylinder rotational speed obtained from said detecting means,
An arithmetic unit for determining the contact time of the ink transfer roll from the memory table as data in the ink quality table as a correction value, and ON / OFF control of a solenoid of the directional control valve via a timer based on the contact time, A control unit for varying the number of swings of the ink transfer roll with respect to the number of rotations of the plate cylinder; and a swing control device for the ink transfer roll. 2. The control device is a detecting means for detecting the number of rotations of the plate cylinder drive system of the printing press in operation, and a pattern area ratio of each color obtained by decomposing a printed pattern printed on printing paper for each color. A pattern area ratio meter to be obtained, a function table defining the paper quality and ink quality stages, a memory table storing a relational expression between the printing speed and the swing cycle of the ink transfer roll as an average pattern area ratio as a parameter, Based on the rotation speed obtained from the above, the print speed, paper quality, and data in the ink quality table are used as correction values to determine the swing cycle of the ink transfer roll, and the time for one cycle corresponding to the swing cycle is calculated. 2. The ink transfer roll according to claim 1, further comprising a control unit for controlling ON / OFF of a solenoid of the direction switching valve via a timer based on the time of the same cycle. Swing control device. 3. With the oscillation cycle in which the ink transfer roll is in contact with the ink discharge roll and the ink kneading roll, and oscillates, the relationship between the contact time ratio of the ink transfer roll and the average picture area ratio is determined by using a printing speed as a parameter, 3. The swing control device for an ink transfer roll according to claim 2, wherein a plurality of linear function formulas are applied with the average picture area ratio as a boundary. 4. The contact time for the ink transfer roll to oscillate in contact with the ink discharge roll and the ink kneading roll is fixed, and the printing speed and the oscillating cycle of the ink transfer roll are represented by the average picture area ratio as a parameter. 4. The swing control device for an ink transfer roll according to claim 3, wherein a plurality of linear function expressions are applied with respect to the speed. 5. 5. The swing control device for an ink transfer roll according to claim 1, wherein the control device is a computer.