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US 10,703,091 B2Granted
Printing machine having ductor roller, correction device, and printing machine correction method
AssigneeI.Mer Co., Ltd.
InventorKenjiro Yamasaki
Life of this patent
Estimating the term…
Abstract
A printing machine has an ink fountain, a fountain roller in contact with the ink fountain, a ductor roller, at least an ink transfer roller and a controller configured and programmed to control the ductor roller. For the printing machine, individual graph data gr and its initial values gri, and average g of the graph data over the entire ductor roller and its initial value gi are used to change graph data gr and g during printing so as to cancel errors between measured printed densities and desired printed densities. An adjustment apparatus and method also achieve this task for such a printing machine.
Claims7
A printing machine having a ductor roller and comprising an ink fountain, a fountain roller in contact with the ink fountain, the ductor roller, at least an ink transfer roller, and a controller configured and programmed to control the ductor roller,
- wherein said ductor roller is provided with multiple individual rollers arranged along an axis direction of the ductor roller,
- wherein time durations during which the individual rollers are in contact with the fountain roller are referred to as contact time (τ), a period for controlling the individual rollers between positions in contact with and not in contact with the fountain roller is referred to as a control period (T1), and wherein said controller is configured and programmed to control individually duty ratios of the individual rollers, said duty ratios consisting of ratios (τ/T1) of the contact time to the control period, in order to control individually ink feeding amounts by the individual rollers;
- wherein parameters for the individual rollers indicating desired ink feeding amounts by the individual rollers are referred to as individual graph data (gr), initial values of the individual graph data (gr) are referred to as (gri) and are determined according to images to be printed, an average of the individual graph data (gr) over the whole of the ductor roller is referred to as an averaged graph data (g), and an initial value of the averaged graph data (g) is referred to as (gi), wherein said controller is configured and programmed to control the duty ratios of the individual rollers based upon the individual graph data (gr) and to change the individual graph data (gr) so as to cancel errors between measured printed densities and desired printed densities or according to an input by an operator;
- said printing machine is further provided with an adjustment apparatus for adjusting said duty ratios,
- wherein said adjustment apparatus is configured and programmed:
- wherein a stable value of the averaged graph data (g) is referred to as (ge) and stable values of the individual graph data (gr) are referred to as (gre);
- to collect data including the initial value (gi) and the stable value (ge) both of the averaged graph data (g), and the initial values (gri) and the stable values (gre) both of the individual graph data (gr);
- to update a basic parameter (B) based upon a difference between a distribution of the stable values (ge) and a distribution of the initial values (gi) both of the averaged graph data in the collected data;
- wherein the collected data are classified into multiple printing speed regions according to printing speeds;
- to update individually speed parameters (V) which are parameters in the individual printing speed regions, based upon differences between distributions of the stable values (ge) and distributions of the initial values (gi) both of the averaged graph data in the individual printing speed regions;
- wherein the collected data are classified into multiple regions according to the averaged graph data (g);
- to update individually area parameters (F) which are parameters in the individual regions according to the averaged graph data (g), based upon differences between distributions of the stable values (ge) and distributions of the initial values (gi) in the individual regions according to the averaged graph data (g);
- to process the collected data individually for the individual rollers and to update individually roller parameters (R) which are parameters for the individual rollers, based upon differences between distributions of the stable values (gre) and distributions of the initial values igrq both of the individual graph data;
- to change collectively the duty ratios of the individual rollers based upon three parameters of the updated basic parameter (B), an updated speed parameter (V) corresponding to a printing speed for a present printing job, and an updated area parameter (F) corresponding to an averaged graph data in the present printing job;
- and
- to change individually the duty ratios of the individual rollers based upon the updated roller parameters (R) corresponding to the individual rollers.
13 more elements
An adjustment apparatus for a printing machine having a ductor roller and comprising an ink fountain, a fountain roller in contact with the ink fountain, the ductor roller, at least an ink transfer roller, and a controller configured and programmed to control the ductor roller,
- wherein said ductor roller is provided with multiple individual rollers arranged along an axis direction of the ductor roller,
- wherein time durations during which the individual rollers are in contact with the fountain roller are referred to as contact time (τ), a period for controlling the individual rollers between positions in contact with and not in contact with the fountain roller is referred to as a control period (T1), and wherein said controller is configured and programmed to control individually duty ratios of the individual rollers, said duty ratios consisting of ratios (τ/T1) of the contact time to the control period, in order to control individually ink feeding amounts by the individual rollers;
- wherein parameters for the individual rollers indicating desired ink feeding amounts by the individual rollers are referred to as individual graph data (gr), initial values of the individual graph data (gr) are referred to as (gri) and are determined according to images to be printed, an average of the individual graph data (gr) over the whole of the ductor roller is referred to as an averaged graph data (g), and an initial value of the averaged graph data (g) is referred to as (gi), wherein said controller is configured and programmed to control the duty ratios of the individual rollers based upon the individual graph data (gr) and to change the individual graph data (gr) so as to cancel errors between measured printed densities and desired printed densities or according to an input by an operator;
- said adjustment apparatus being configured and programmed for adjusting said duty ratios:
- wherein a stable value of the averaged graph data (g) is referred to as (ge) and stable values of the individual graph data (gr) are referred to as (gre);
- to collect data including the initial value (gi) and the stable value (ge) both of the averaged graph data (g), and the initial values (gri) and the stable values (gre) both of the individual graph data (gr);
- to update a basic parameter (B) based upon a difference between a distribution of the stable values (ge) and a distribution of the initial values (gi) both of the averaged graph data in the collected data;
- wherein the collected data are classified into multiple printing speed regions according to printing speeds;
- to update individually speed parameters (V) which are parameters in the individual printing speed regions, based upon differences between distributions of the stable values (ge) and distributions of the initial values (gri) both of the averaged graph data in the individual printing speed regions;
- wherein the collected data are classified into multiple regions according to the averaged graph data (g);
- to update individually area parameters (F) which are parameters in the individual regions according to the averaged graph data (g), based upon differences between distributions of the stable values (ge) and distributions of the initial values (gi) in the individual regions according to the averaged graph data (g);
- to process the collected data individually for the individual rollers and to update individually roller parameters (R) which are parameters for the individual rollers, based upon differences between distributions of the stable values (gre) and distributions of the initial values (gri) both of the individual graph data;
- to change collectively the duty ratios of the individual rollers based upon three parameters of the updated basic parameter (B), an updated speed parameter (V) corresponding to a printing speed for a present printing job, and an updated area parameter (F) corresponding to an averaged graph data in the present printing job;
- and
- to change individually the duty ratios of the individual rollers based upon the updated roller parameters (R) corresponding to the individual rollers.
12 more elements
An adjustment method carried out by an adjustment apparatus for a printing machine having a ductor roller and comprising an ink fountain, a fountain roller in contact with the ink fountain, the ductor roller, at least an ink transfer roller, and a controller configured and programmed to control the ductor roller,
- wherein said ductor roller is provided with multiple individual rollers arranged along an axis direction of the ductor roller,
- wherein time durations during which the individual rollers are in contact with the fountain roller are referred to as contact time (τ), a period for controlling the individual rollers between positions in contact with and not in contact with the fountain roller is referred to as a control period (T1), and wherein said controller is configured and programmed to control individually duty ratios of the individual rollers, said duty ratios consisting of ratios (τ/T1) of the contact time to the control period, in order to control individually ink feeding amounts by the individual rollers;
- wherein parameters for the individual rollers indicating desired ink feeding amounts by the individual rollers are referred to as individual graph data (gr), initial values of the individual graph data (gr) are referred to as (gri) and are determined according to images to be printed, an average of the individual graph data (gr) over the whole of the ductor roller is referred to as an averaged graph data (g), and an initial value of the averaged graph data (g) is referred to as (gi), wherein said controller is configured and programmed to control the duty ratios of the individual rollers based upon the individual graph data (gr) and to change the individual graph data (gr) so as to cancel errors between measured printed densities and desired printed densities or according to an input by an operator;
- said adjustment method comprising following steps for adjusting said duty ratios:
- wherein a stable value of the averaged graph data (g) is referred to as (ge) and stable values of the individual graph data (gr) are referred to as (gre);
- collecting data including the initial value (gi) and the stable value (ge) both of the averaged graph data (g), and the initial values (gri) and the stable values (gre) both of the individual graph data (gr);
- updating a basic parameter (B) based upon a difference between a distribution of the stable values (ge) and a distribution of the initial values (gi) both of the averaged graph data in the collected data;
- classifying the collected data into multiple printing speed regions according to printing speeds;
- updating individually the speed parameters (V) which are parameters in the individual printing speed regions, based upon differences between distributions of the stable values (ge) and distributions of the initial values (gi) both of the averaged graph data in the individual printing speed regions;
- classifying the collected data into multiple regions according to the averaged graph data (g);
- updating individually area parameters (F) which are parameters in the individual regions according to the averaged graph data (g), based upon differences between distributions of the stable values (ge) and distributions of the initial values (gi) in the individual regions according to the averaged graph data (g);
- processing the collected data individually for the individual rollers and individually updating roller parameters (R) which are parameters for the individual rollers, based upon differences between distributions of the stable values (gre) and distributions of the initial values (gri) both of the individual graph data;
- changing collectively the duty ratios of the individual rollers based upon three parameters of the updated basic parameter (B), an updated speed parameter (v) corresponding to a printing speed for a present printing job, and an updated area parameter (F) corresponding to an averaged graph data in the present printing job;
- and
- changing individually the duty ratios of the individual rollers based upon the updated roller parameters (R) corresponding to the individual rollers.
12 more elements
Dependencies are inferred from the claim text.