US 9,446,581 B2Granted

Ink supply device for printing machine

AssigneeI. Mer Co., Ltd.

InventorKenjiro Yamasaki

Life of this patent

Estimating the term…

Loading patent…

Abstract

Provided is an ink supply device for a printing machine which can accurately supply a quantity of ink necessary for acquiring desired concentration while making the fine adjustment of concentration of ink by an operator unnecessary. A control device 34 of the ink supply device includes: a concentration prediction value calculation means 53 which acquires a concentration prediction value when the concentration becomes stable based on concentration measured values of a predetermined number of printed matters; a graph change value calculation means 54 which acquires a graph change value using the concentration prediction value and a concentration target value; and a control graph value calculation means 55 which acquires a control graph value for controlling a rotational angle based on a preset set graph value and the graph change value.

Claims8

Dependent claims

An ink supply device of a printing machine, said ink supply device comprising:

an ink fountain roller that constitutes an ink fountain;
a plurality of ink transfer rollers that are divided in the lengthwise direction of the ink fountain roller and are arranged adjacent to the ink fountain roller;
a switching device that individually changes over the respective ink transfer rollers between a transfer position where the ink transfer roller is brought into contact with the ink fountain roller and a non-transfer position where the ink transfer roller is disposed away from the ink fountain roller;
and
a control device programmed to control supply of a quantity of ink,
wherein, based on a graph value set corresponding to a pattern area of a printed matter, a circumferential length of ink transferred to the ink transfer roller from the ink fountain roller is controlled by changing over an energy state of a switching valve of the switching device by the control device,
wherein the control device comprises:
a concentration prediction value calculation means that acquires a concentration prediction value when the concentration becomes stable based on concentration measured values of a predetermined number of printed matters;
a graph change value calculation means that acquires a graph change value using the concentration prediction value and a concentration target value;
a control graph value calculation means that acquires a control graph value for controlling a rotational angle of the required ink fountain roller based on a preset set graph value and the graph change value;
and
a switching valve turning ON/OFF means that controls an ON/OFF time of the switching valve,
wherein the concentration prediction value calculation means acquires a prediction value Y at a point of time that the measurement is performed n times by the following formulae, where with a measurement value at n-th time being Xn, an average value of measurement values of n times being Xa, a standard deviation amounting to n times being σ, a deviation value of a measurement value at n-th time being T, and a concentration prediction coefficient being α:
Y=Xn+{T×|Xn−Xa|×α};
T={10×(Xn−Xa)/σ};
and
σ2={(X1−Xa)2+(X2−Xa)2+ . . . +(Xn−Xa)2}/n,
wherein, in the above formulae, when n=1 and when the same measurement value is acquired in all measurements performed n times, the graph change value calculation means acquires a graph change value Gs by the following formulae, where with a concentration target value being K, a preset graph value being Gb, a ratio of surplus/shortage of ink being L, and a graph value correction coefficient being β:
Y=Xn;
L=(Y−K)×100/K(%);
and
Gs=Gb×L×β÷100(%), and
wherein the control graph value calculation means acquires the control graph value Ga by the following formula:
Ga=Gb+Gs.

21 more elements

An ink supply device of a printing machine, said ink supply device comprising:

an ink fountain roller that constitutes an ink fountain;
a plurality of ink transfer rollers that are divided in the lengthwise direction of the ink fountain roller and are arranged adjacent to the ink fountain roller;
a switching device that individually changes over the respective ink transfer rollers between a transfer position where the ink transfer roller is brought into contact with the ink fountain roller and a non-transfer position where the ink transfer roller is disposed away from the ink fountain roller;
and
a control device programmed to control supply of a quantity of ink,
wherein, based on a graph value set corresponding to a pattern area of a printed matter, a circumferential length of ink transferred to the ink transfer roller from the ink fountain roller is controlled by changing over an energy state of a switching valve of the switching device by the control device,
wherein the control device comprises:
a concentration prediction value calculation means that acquires a concentration prediction value when the concentration becomes stable based on concentration measured values of a predetermined number of printed matters;
a graph change value calculation means that acquires a graph change value using the concentration prediction value and a concentration target value;
a control graph value calculation means that acquires a control graph value for controlling a rotational angle of the required ink fountain roller based on a preset set graph value and the graph change value;
and
a switching valve turning ON/OFF means that controls an ON/OFF time of the switching valve, and
wherein, at the time the graph value is changed to a control value Ga from a set value Gb in the control graph value calculation means,
the switching valve turning ON/OFF means changes an ON time of the switching valve longer so that an ink quantity equal to or larger than the difference is rapidly supplied for a fixed time in case of increasing the ink quantity, and
the switching valve turning ON/OFF means changes an OFF time of the switching valve longer so that an outputting of the ink transfer roller is stopped for a fixed time in case of decreasing the ink quantity.

12 more elements

An ink supply device of a printing machine, said ink supply device comprising:

an ink fountain roller that constitutes an ink fountain;
a plurality of ink transfer rollers that are divided in the lengthwise direction of the ink fountain roller and are arranged adjacent to the ink fountain roller;
a switching device that individually changes over the respective ink transfer rollers between a transfer position where the ink transfer roller is brought into contact with the ink fountain roller and a non-transfer position where the ink transfer roller is disposed away from the ink fountain roller;
and
a control device programmed to control supply of a quantity of ink,
wherein, based on a graph value set corresponding to a pattern area of a printed matter, a circumferential length of ink transferred to the ink transfer roller from the ink fountain roller is controlled by changing over an energy state of a switching valve of the switching device by the control device,
wherein the control device comprises:
a concentration prediction value calculation means that acquires a concentration prediction value when the concentration becomes stable based on concentration measured values of a predetermined number of printed matters;
a graph change value calculation means that acquires a graph change value using the concentration prediction value and a concentration target value;
a control graph value calculation means that acquires a control graph value for controlling a rotational angle of the required ink fountain roller based on a preset set graph value and the graph change value;
and
a switching valve turning ON/OFF means that controls an ON/OFF time of the switching valve,
wherein at the time of exchanging an original plate, a comparison between a pattern area before exchanging the original plate and a pattern area after the exchange of the original plate is performed with respect to all ink transfer rollers,
wherein, when the pattern area is increased after the exchange of the original plate, additional ink distribution is performed,
wherein, when the pattern area is decreased after the exchanging the original plate, an operation of the ink transfer roller is stopped for a fixed time, and
wherein, assuming that the pattern area before exchanging the original plate is A (%), a retention ink quantity (%) before exchanging the original plate is Y+AZ (%), the pattern area after the exchange of the original plate is B (%), a retention ink quantity (%) after the exchange of the original plate is Y+BZ (%), the following operations are performed corresponding to whether the difference (B−A)Z (%) before and after the exchange of the original plate takes a positive value or a negative value:
the switching valve turning ON/OFF means outputs ON/OFF signals so that additional ink distribution is performed Z times in case of (B−A)Z>0;
and
the switching valve turning ON/OFF means outputs ON/OFF signals so that ink transfer amounting to (A−B)Z/B times is stopped in case of (B−A)Z<0.

16 more elements

Dependencies are inferred from the claim text.

Facts

Application: 14/416,269Filed 16 Sep 2014
Priority: JP 2013-19822225 Sep 2013
Published: US 2015/0183212 A12 Jul 2015
Granted: 20 Sep 2016
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

B41F 31/32
Arrangements for tripping, lifting, adjusting, or removing inking rollers; Supports, bearings, or forks therefor: lifting or adjusting devices
B41F 31/14
Ducts, containers, supply or metering devices: applications of messenger or other moving transfer rollers
B41F 31/307
Arrangements for inking roller bearings, forks or supports: sliding bearings
B41F 31/36
Lifting or adjusting devices: fluid-pressure operated