Continuous multicolor ink jet press and synchronization process for this press
First Claim
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1. Continuous multicolor ink jet press comprising:
- multiple print heads each supplied with a specific color ink through a respective ink circuit;
a substrate passing successively under the print heads;
a motor driving the substrate;
a high resolution rotary encoder disposed on the motor and providing a high frequency pulse;
a printing system upstream of the print heads for regularly printing first marks on the substrate;
multiple sensors for reading the first marks, each sensor being associated with one of the print heads;
a synchronization circuit connected to the print heads, the sensors, and the encoder; and
a process controller controlling the synchronization circuit for supervising printing of each of the print heads.
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Abstract
This invention relates to a continuous multicolor ink jet press comprising a substrate driven by a motor and passing under at least one print head associated with a sensor and supplied by an ink circuit, a synchronization circuit, connected to a process controller and a position encoder placed on the substrate drive motor transmitting a signal to the synchronization circuit, this encoder being a high resolution position encoder. A printing system is located upstream of the printheads and which prints marks regularly on the substrate. These marks are detected by the sensor associated with the printheads.
170 Citations
29 Claims
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1. Continuous multicolor ink jet press comprising:
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multiple print heads each supplied with a specific color ink through a respective ink circuit; a substrate passing successively under the print heads; a motor driving the substrate; a high resolution rotary encoder disposed on the motor and providing a high frequency pulse; a printing system upstream of the print heads for regularly printing first marks on the substrate; multiple sensors for reading the first marks, each sensor being associated with one of the print heads; a synchronization circuit connected to the print heads, the sensors, and the encoder; and a process controller controlling the synchronization circuit for supervising printing of each of the print heads. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 24, 29)
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23. Press synchronization process for a press including a substrate driven by a motor:
- comprising the steps of moving the substrate under at least one print head associated with a sensor;
supplying ink to the print head through an ink circuit;
transmitting a signal from an encoder on the substrate drive motor to a synchronization circuit connected to a process controller; and
printing marks regularly on the substrate, in which the detection of a first mark is authorized firstly within a limited time window centered on the instant at which a first mark will probably pass under a sensor. - View Dependent Claims (25, 26, 27, 28)
- comprising the steps of moving the substrate under at least one print head associated with a sensor;
Specification