JP2006231579A - Ink supply device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem that the supply of ink becomes unstable in a region where the supply is scarce when an extremely small pictorial pattern is printed, in an ink supply device of a printing machine. <P>SOLUTION: This ink supply device has a region where the adjustment of the ink supply is made variable continuously and a region where the supply is made intermittently. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

The present invention relates to an ink supply device for a printing press.

  A conventional ink supply device for a printing press will be described with reference to FIGS. FIG. 6 shows a conventional ink fountain type continuous ink supply device 1, which includes an ink amount adjusting member 110 capable of adjusting a plurality of ink supplies in the width direction, and the ink amount adjusting member 110. The ink fountain roller 4 that forms the ink fountain 10 and the ink delivery roller 5 disposed with a predetermined minute gap from the ink fountain roller 4 are configured. The ink source roller 4 rotates at a relatively low speed, and the surface speed of the ink delivery roller 5 is operated at a speed substantially equal to the printed product speed. The ink amount adjusting member 110 includes a plurality of ink blades 111 provided in the width direction and an ink amount adjusting mechanism 112 that adjusts a gap between the ink blade 111 and the ink base roller 4. The ink amount adjusting mechanism 112 includes a moving device 114 and a link 113 '. The motor 114a of the moving device 114 is driven by an ink amount adjustment control device (not shown) according to an ink adjustment instruction amount indicated by an ink adjustment instruction scale, and is moved to a command position by a potentiometer (not shown) and stopped. The movement of the moving device 114 is transmitted to the ink blade 111 through the link 113 ′, the gap between the ink blade 111 and the ink base roller 4 is adjusted, and the ink supply film thickness S1 is set.

As the ink base roller 4 rotates, the ink is transported to the gap with the ink delivery roller 5. If the ink film thickness S 1 is larger than the gap G, the ink is transferred to the ink delivery roller 5, and further contacts the ink delivery roller 5. It is transferred to the ink roller group 6 and used for printing. Since the ink transfer is performed while the ink film is separated, the ink remains on the ink base roller 4 and the ink film thickness S2 returns, and the ink transfer roller 5 also returns the ink film thickness S3. The principle relationship between the ink film thickness on the ink base roller 4 and the amount of ink supplied to the ink roller group is shown by a solid line in FIG. That is, when the ink film thickness S1 on the ink source roller 4 is smaller than the gap G with the ink delivery roller 5, it cannot be transmitted to the ink delivery roller 5. When it exceeds G, the transmission starts, and from the supply amount of the ink film thickness S1. It shows that the amount obtained by subtracting the return amount of the return film thickness S2 on the ink source roller 4 is supplied.

Actually, the gap G is the dimension between the rollers, the roller surface is rough and wavy, there is vibration when starting to rotate, vibration is also added at high speed, and it adheres depending on the properties of the ink Ease and separation state of ink film changes. In principle, the supply starts when the supply film thickness S1 reaches the gap G at the start of supply, and when the supply film thickness S1 is reduced from the state of supply once, the transmission is performed within the range of the gap G or the film thickness S2. Be cut off. Accordingly, the ink supply becomes unstable when the ink supply film thickness S1 is in the vicinity of the gap G, and naturally the ink supply is not performed in a region smaller than the vicinity of G. FIG. 5 also shows a relationship with an ink adjustment instruction scale for instructing an ink adjustment instruction amount to an ink amount control device (not shown), indicating that adjustment is not effective even if an instruction below G is issued.

The amount of ink to be supplied is determined by the amount of the pattern to be printed. The problem here is when printing a small pattern called a minimal pattern. When the ink supply amount is small and the supplied ink film thickness is in the vicinity of the gap G, the ink supply becomes unstable as described above, and the printed density becomes darker or thinner, resulting in poor print quality.

FIG. 7 shows a call roller type ink supply device 2 which is another ink supply method. This is provided with an ink calling roller 210 in place of the ink delivery roller 5 of the ink fountain type continuous ink supply device 1. The ink fountain 10 for supplying ink and the ink source roller 4 are the above ink fountain type continuous ink supply device. Same as 1. In this case, the ink on the ink base roller 4 is intermittently transmitted to the ink roller group 6 by the reciprocating motion of the ink calling roller 210. Therefore, since there is no gap G unlike the ink fountain type continuous ink supply apparatus 1 described above, it is possible to print a very small picture. However, in this case, since the ink calling roller 210 reciprocates and hits the ink source roller 4 and the ink roller group 6, a large impact is applied, noise is generated, and the print quality is hindered by the impact. In particular, it becomes prominent when operating at high speed, and is not suitable for high-speed machines.

  FIG. 9 shows still another ink supply type ink pump / ink rail type ink supply device 3. This is provided with an ink pump 320 and an ink rail 310 in place of the ink fountain 10 of the ink fountain type continuous ink supply apparatus 1 described above, and can continuously change the discharge amount. A plurality of ink pumps 320 are provided in the width direction, and an ink pump motor 330 is connected to the ink pump 320 and is driven by the motor 330. The ink rail 310 for uniformly distributing the ink discharged from the ink pump 320 in the width direction to be handled by each ink pump 320 and placing the ink on the ink source roller 4 provides a slight gap with the ink source roller. Are arranged. The ink delivery roller 5 and the ink roller group 6 are the same as those in the ink fountain type continuous ink supply device 1.

In the case of the ink pump / ink rail type ink supply device 3, there is a gap G between the ink source roller 4 and the ink delivery roller 5 as in the ink fountain type continuous ink supply device 1. Therefore, even if the ink film thickness S1 is smaller than the gap G, the ink film S1 is accumulated until it becomes larger than the gap G. When the ink film thickness S becomes larger than G, the ink is transferred to the ink delivery roller 5. It will be. However, the amount of ink supplied in this region is very small, and the time until the ink supply film thickness S1 reaches G, the start of transfer, the film thickness after transfer (approximate to S2), and the like vary. The variation state is shown in FIG. 10, but the ink adjustment instruction amount is averaged over a long period of time. However, as the ink adjustment instruction amount becomes smaller, the above-described variation increases and the print quality variation increases.

In the ink pump / ink rail type ink supply device 3 described above, the ink base roller 4 is slow and there is a gap between the ink delivery roller 5. Some are provided. In this case as well, ink transfer varies as the ink supply amount decreases.

In the case of printing a small pattern, for example, Japanese Patent Laid-Open No. 11-138762 has been proposed. However, this is an intermittent rotation of the ink source roller 4 and can handle the case where the entire width direction is small. When partially printing a small picture, it is inconvenient for printing a large picture part.

JP-A-11-138762

As described above, when printing a minimal pattern, printing is performed in an area where the ink supply is unstable, and the print quality is not stable.
Since the pattern is not necessarily full width, it is often partial, and a pattern corresponding to this is necessary.
The call roller type ink supply device has a large impact when the ink call roller 210 is reciprocally contacted with a machine rotating at high speed, and printing failure due to the impact is likely to occur, and vibration and noise are large and the printing environment is bad.
There are issues such as.

  In order to solve the above-mentioned problem, the present invention according to claim 1 is an ink supply device of a printing press, wherein the ink supply is continuously supplied from the boundary point, and the supply is intermittently performed. It has the area | region to do. According to a second aspect of the present invention, there is provided a boundary point according to the first aspect, wherein the ink film thickness on the ink source roller by adjusting the ink supply amount is larger than the gap between the ink source roller and the ink delivery roller. It is characterized by that.

  In order to solve the above-mentioned problem, the present invention described in claim 3 is the ink supply film thickness or supply ink at the boundary point in the region where the ink amount according to claim 1 or 2 is intermittently supplied. It is characterized by having an intermittent supply device that intermittently supplies more than the amount and adjusts the intermittent time so that the average supply amount becomes a desired ink amount.

  According to a fourth aspect of the present invention, in the region where the amount of ink according to the first to third aspects of the present invention is intermittently supplied, the printed matter is made to match the color of the printed matter with the target color of the sample. It is characterized in that the intermittent time is automatically adjusted and controlled based on the color tone deviation of the sample.

  In order to solve the above problems, the present invention according to claim 5 is the apparatus according to any one of claims 1 to 4, wherein the ink amount adjusting member of a printing press is capable of making a plurality of adjustments in the width direction. An ink fountain-type ink continuous supply apparatus comprising: an ink fountain roller that forms an ink fountain together with the ink amount adjusting member; and an ink delivery roller disposed with a predetermined minute gap from the ink fountain roller. An ink amount adjusting mechanism that contacts and separates an adjusting blade that adjusts the film thickness of the supplied ink by contacting and separating from the ink base roller according to the supply instruction amount, the position of the adjusting blade at the boundary point, and the ink source roller more The intermittent supply device that moves the ink supply film thickness smaller than the close micro gap is used as a constituent element.

  In order to solve the above-mentioned problem, the present invention according to claim 6 is the apparatus according to any one of claims 1 to 4, wherein a plurality of ink pumps each having a discharge amount adjustable in the width direction are provided. , An ink rail for applying the ink discharged from the ink pump onto the roller, an ink fountain roller disposed with a predetermined minute gap from the ink rail, and a predetermined tiny gap with the ink roller. In an ink pump / ink rail type ink supply device composed of arranged ink delivery rollers, an ink pump that discharges ink according to an ink supply instruction amount, and an amount greater than the ink discharge amount at the boundary point A control device for intermittently adjusting the operation of the ink pump so as to obtain an average supply amount corresponding to the following ink supply instruction amount is a constituent element.

According to the ink supply device of the present invention, the area above the predetermined boundary point is continuously changed according to the ink supply instruction amount instructed by the ink adjustment instruction scale 8 to supply ink, and the area below the boundary point. The ink supply film thickness by the adjusting blade 111 or the discharge amount by the ink pump at the boundary point is intermittently changed over time, and the average supply amount is changed according to the ink supply instruction amount indicated by the ink adjustment instruction scale 8. So
Stable ink supply can be achieved even when printing a very small pattern, improving print quality.
Minimal patterns can be handled even if they are partial in the width direction.
No vibrations or shocks occur even at high speeds, and printing problems are not caused.
There are effects such as.

(First embodiment)
As a first embodiment of the present invention, a case of an ink fountain type continuous ink supply apparatus 1 will be described with reference to FIGS. 1, 2A, 3A and 4. FIG. FIG. 1 is a relationship graph between the ink adjustment instruction scale 8 (ink adjustment instruction amount) and the ink supply amount to the ink roller group 6 according to the first embodiment. 2A is a graph showing the relationship between the ink adjustment instruction scale 8 of the ink fountain type continuous ink supply apparatus 1 and the ink supply film thickness S1 on the ink source roller 4, that is, the gap between the adjustment blade 111 and the ink source roller 4 in FIG. is there. FIG. 3A is a graph showing the relationship between the passage of time and the ink supply film thickness in A, B or C of FIG. FIG. 4 shows an example of the intermittent supply mechanism 7.

M2Z in FIG. 1 is a continuous supply region where the ink adjustment instruction scale 8 (ink adjustment instruction amount) and the ink supply amount continuously change, and M1Z is a boundary point P in the ink fountain type continuous ink supply apparatus 1. In the intermittent supply region, the ink film thickness SP on the ink source roller 4 at the boundary point P is intermittently supplied. In the ink fountain type continuous ink supply device 1, the continuous supply region M2Z is controlled by a control device (not shown) so as to have an ink film thickness corresponding to the value of the ink adjustment instruction scale 8. In the intermittent supply region M1Z, the ink film thickness SP on the ink source roller 4 at the boundary point P is intermittently supplied, but the intermittent method is the time to supply within the intermittent period T as shown in B or C of FIG. 3A. Is supplied in the same way as TX1 or TX2. The ratio of TX to period T is set in accordance with the value of ink adjustment instruction scale 8. That is, at the boundary point P, the ratio of TX is 100%, and when the scale is 0, the ratio is 0%. B in FIG. 3A represents a case where the ink adjustment instruction scale is 50% of the boundary point P and C is 25%. If intermittent supply is performed as described above, ink that is proportional to the value of the ink adjustment indication scale 8 is supplied as shown in the graph shown by the two-dot chain line in FIG. Thus, even in a region where the ink adjustment instruction scale is small, the ink supply according to the scale value can be supplied without being interrupted.

In recent years, attention has been focused on non-skilled printing operators in order to reduce the number of defective printing waste while meeting strict printing quality needs. In the minimal pattern printing, the present invention enables pattern quality control, which has been extremely difficult due to its instability. That is, the design color tone factor of the printed material is measured, and the deviation is obtained by comparison with the pattern color tone factor of the sample. Finally, the ink adjustment scale is automatically corrected and controlled. As a result, it is possible to obtain an effect of greatly reducing the waste paper generated during the operation adjustment.
The printed picture factor measurement device can be installed on the printing press and continuously measure it, but at a different location from the printing press, measure it periodically or irregularly and compare it with the color factor of the sample. It is also possible to use a method of transmitting an ink adjustment scale correction signal corresponding to the above to the control device of the printing press. Incidentally, as a typical color tone factor of the above pattern, there is a printing ink density and the like.

  An example of a mechanism for performing intermittent supply in the ink fountain type continuous ink supply apparatus 1 will be described with reference to FIG. 6 differs from the conventional apparatus shown in FIG. 6 in that the link 113 for pushing the adjusting blade 111 can be adjusted by the ink amount adjusting mechanism 112 in the same manner as the conventional one, and the supply intermittent mechanism 7 is made to act on the link 113. It is to be able to do it. The link 113 is adjusted by the ink amount adjusting mechanism 112 so that the link 113 can be continuously adjusted to a position corresponding to the ink adjustment instruction scale 8 as in the conventional case, and when the ink adjustment instruction amount is not more than the boundary point P, the adjustment blade 111 is used. The supply interrupt mechanism 7 pushes the link 113 with the push rod 710 so that the ink film thickness on the ink source roller 4 is larger than the gap G between the ink source roller 4 and the ink delivery roller 5. The thin film thickness is set to S4. When the push rod 710 is not pushing the link 113, the link-side tip 710b of the push rod and the link 113 are made to stand by at a position where they do not hit even if the ink amount adjusting mechanism 112 adjusts to the maximum ink film thickness. The other end of the push rod 710 is a cam-side head 710 a that is pressed against the cam 730 by the action of a spring 720. The cam 730 is attached to a rotating shaft end of a motor 740 supported by a fixed body with a bracket 750.

When the instruction from the ink adjustment instruction scale 8 is equal to or less than the boundary point P, the intermittent operation is performed according to the scale value as described above. For example, in the case of B or C in FIG. The mark marked with S4, that is, the time after subtracting the time TX for supplying the ink film thickness S1 from the period T, pushes the push rod 710 with the convex part 730a of the cam 730, pushes the link 113 and presses the adjustment blade 111 and the ink. When the gap with the original roller 4 is set to S4 and the ink supply of the next cycle is started, the cam 730 is rotated by the motor 740, the push rod 710 is released by the recess 730b of the cam 730, and the link 113 is moved to the ink amount adjusting mechanism 112. The adjusting blade 111 returns to the position where the SP ink film thickness is supplied. A motor 740 is controlled by a control device (not shown) to rotate the cam 730 in accordance with the ink adjustment instruction scale 8.

In the above-described supply / interruption mechanism 7, the push rod 710 is pushed and pulled using the motor 740 and the cam 730 to perform the intermittent operation. However, instead of the motor 740 and the cam 730, various actuators such as a solenoid, an air cylinder, and a hydraulic mechanism are used. The supply film thickness can be switched, but the illustration is omitted. Further, without using a special mechanism, the adjustment blade 111 may be moved intermittently by the motor 114a of the ink adjustment mechanism 112 so that the ink blade thickness SP and S4 are moved. A device for intermittent supply including the intermittent supply mechanism 7 described above is an intermittent supply device.

(Second Embodiment)
Unlike the first embodiment, the second embodiment of the present invention is replaced with an ink pump / ink rail type ink supply device 3 provided with a plurality of ink pumps 320 in the width direction. This will be described with reference to FIGS. 1, 2B and 3B. FIG. 1 is a graph showing the relationship between the ink adjustment instruction scale 8 (ink adjustment instruction amount) and the ink supply amount to the ink roller group 6 in common with the first embodiment. FIG. 2B is a graph showing the relationship between the ink adjustment instruction scale 8 and the ink pump discharge amount of the ink pump / ink rail type ink supply device 3. FIG. 3B is a graph showing the relationship between the passage of time and the ink pump discharge amount in A, B or C of FIG.

1 is the same as the continuous supply region M2Z, the boundary point P, and the intermittent supply region M1Z described in the first embodiment, but the discharge amount of the ink pump 320 in the intermittent supply region M1Z is as shown in FIG. 2B. QP is intermittently supplied. As for the intermittent method, as shown in B or C of FIG. 3B, the supply time within the intermittent period T is changed and supplied as in TX1 or TX2. The ratio of TX to period T is set in accordance with the value of ink adjustment instruction scale 8. That is, at the boundary point P, the ratio of TX is 100%, and when the scale is 0, the ratio is 0%. B in FIG. 3A represents a case where the ink adjustment instruction scale is 50% of the boundary point P and C is 25%.

  If intermittent supply is performed as described above, ink that is proportional to the value of the ink adjustment indication scale 8 is supplied as shown in the graph shown by the two-dot chain line in FIG. Thus, even in a region where the ink adjustment instruction scale is small, the ink supply according to the scale value can be supplied without being interrupted.

In the intermittent operation, an ink adjustment instruction amount instruction is transmitted to the intermittent operation control device (not shown) by the ink adjustment instruction scale 8, and the control device calculates a period T and a discharge time TX corresponding to the amount, and from the control device, This is performed by an intermittent supply device (intermittent operation control device) that drives and controls the ink pump motor 330.
The method of automatically correcting and controlling the ink adjustment scale based on the pattern color tone deviation can be applied as in the first embodiment.

By performing the above-mentioned intermittent operation in the ink pump / ink rail type ink supply device 3, it is possible to cope with the presence of a partial minimal pattern in the width direction, and the amount of ink that can be transferred from the beginning of the intermittent period T. Therefore, since the supply cycle is stabilized, the print quality is stabilized. Although the ink pump 320 is discharged intermittently, the state where the ink pump motor 330 is continuously operated is not the intermittent operation referred to in the present embodiment but the continuous operation.

(Third embodiment)
According to the third embodiment of the present invention, in the ink pump / ink rail type ink supply device 3 of the second embodiment, the ink pump discharge amount in the intermittent supply region M1Z is not limited to QP but is a periodic variable QR. It is a thing.

  The apparatus is the same as in the second embodiment, but as shown by the half line example in FIG. 3B, the discharge cycle T, discharge time TX, and discharge amount QR of the ink pump 320 are used as variables. It is an intermittent supply device with an arithmetic unit that can be changed according to the amount of ink adjustment indicated by the ink adjustment indication scale 8.-

In addition to having the same effect as the second embodiment, the ink pump motor 330 is continuously operated and the discharge amount of the ink pump is smoothly and intermittently supplied, so the control performance is smooth and stable. It has the feature to do. Accordingly, the ink amount can be discharged at a more stable cycle and can be reliably transmitted to the ink delivery roller 5.

Relationship graph of ink adjustment instruction scale 8 (ink adjustment instruction amount) and ink supply amount to ink roller group 6 according to the first embodiment of the present invention

A is a relationship graph between the ink adjustment indication scale 8 and the ink film thickness S1 on the ink base roller 4, and B is a relationship graph between the ink adjustment indication scale 8 and the ink pump discharge amount.

Illustration of intermittent supply

An example of the intermittent supply mechanism 7 according to the first embodiment of the present invention

Graph of the relationship between the ink film thickness on the conventional ink base roller and the amount of ink supplied to the ink roller group

Illustration of conventional ink fountain type continuous ink supply device

Conventional ink call roller type ink supply device explanatory diagram

Graph of ink discharge amount and ink supply amount of conventional ink pump and ink rail type ink supply device

Explanatory drawing of conventional ink pump and ink rail type ink supply device

Temporal change of ink film thickness on ink base roller in conventional ink pump and ink rail type ink supply device

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Ink fountain type continuous ink supply apparatus 10 Ink fountain 110 Ink quantity adjustment member 111 Adjustment blade 112 Ink quantity adjustment mechanism 113 Link 113a Blade pushing-up part 113b Support point 113c Adjustment mechanism contact part 114 Moving apparatus 114a Motor 2 Call roller type ink supply apparatus 210 Ink call roller 3 Ink pump / ink rail type ink supply device 310 Ink rail 320 Ink pump 330 Ink pump motor 4 Ink source roller 5 Ink delivery roller 6 Ink roller group 7 Intermittent supply mechanism 710 Push rod 710a Cam side head 710b Link Side tip 720 Spring 730 Cam 730a Convex part 730b Concave part 740 Motor 750 Bracket 8 Ink adjustment instruction scale

Claims (6)

  An ink supply device for a printing press, comprising: a region where ink supply is continuously supplied at a boundary point; and a region where ink supply is intermittently supplied.   2. The ink supply device according to claim 1, wherein the boundary point is a position where an ink film thickness on the ink source roller by adjusting an ink supply amount is larger than a gap between the ink source roller and the ink delivery roller.   In the region where the amount of ink is intermittently supplied, the amount of ink supplied at or above the boundary point is intermittently supplied, and the intermittent supply time is adjusted to obtain the desired amount of ink. The ink supply device according to claim 1 or 2, further comprising an intermittent supply device.   2. In the region where the amount of ink is intermittently supplied, the intermittent time is automatically adjusted and controlled based on a color tone deviation between the printed material and the sample so that the color of the printed material matches the target color of the sample. The ink supply device according to claim 3.   Ink amount adjusting member of a printing press capable of making a plurality of adjustments in the width direction, an ink fountain roller that forms an ink fountain together with the ink amount adjusting member, and ink disposed with a predetermined minute gap from the ink fountain roller In an ink fountain-type ink continuous supply device constituted by a delivery roller, an ink amount adjusting mechanism that contacts and separates an adjusting blade that adjusts the film thickness of the supplied ink by contacting and separating the ink base roller according to the ink supply instruction amount; 5. An intermittent supply device that moves the adjusting blade at a position at the boundary point and a position at which the ink supply film thickness is smaller than the minute gap closer to the ink source roller. Ink supply device.   A plurality of ink pumps with adjustable discharge amount provided in the width direction, an ink rail for applying the ink discharged by the ink pump onto the roller, and an ink fountain roller arranged with a predetermined minute gap from the ink rail An ink pump that discharges ink in accordance with an ink supply instruction amount, in an ink pump / ink rail type ink supply device configured by an ink delivery roller arranged with a predetermined minute gap between the ink base roller, 2. A control device for intermittently adjusting the operation of the ink pump so that an amount equal to or larger than an ink discharge amount at the boundary point becomes an average supply amount corresponding to an ink supply instruction amount below the boundary point. The ink supply device according to claim 4.

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