Method and apparatus for regulating the register in a printing press
AssigneeEltromat GmbH
InventorsKlaus Reckefuss, Gerhard Lohmeyer, Bernd Morgenstern
Life of this patent
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Abstract
The invention relates to a method and an apparatus for regulating the register of a rotary printing press (18), including a register regulator (17), the components (1, 5; 2, 6; 3, 7; 4, 8; 9, 10) of which are connected in a real-time bus system (12) and are chronologically synchronized therein.
Claims15
A method for controlling a register in a rotary printing press (18) by a register control device (17), wherein the printing press (18) includes at least two printing units (DWn-1 to DWn+2), each of which includes at least one cylinder (13) supporting a printing image to be transmitted and at least one cylinder (14) pressing a print fabric (16) against the other cylinder, and the control device (17) comprising at least a measuring unit (2, 6) and a measuring head (1, 5), a register control unit (3. 7), a trigger unit (4, 8) and a drive unit (9, 10), wherein components (2, 6;
- 1, 5;
- 3, 7;
- 4, 8;
- 9, 10) of the control device (17) are mutually connected through a real-time bus system (12) in which all bus members of the real-time bus system (12) are chronologically synchronized with each other, the method comprising the steps of:
- a. for each trigger unit and/or measuring unit and/or register control unit, a reference time signal is generated and transmitted via the bus system (12), which refers to a time reference common to all components, which is generated by the bus system (12),
- b. a time interval limited by at least 2 reference time signals issued chronologically in succession is further divided by the trigger unit by issuing at least one time signal located between the reference dates,
- c. the trigger unit selects one signal from the signal sequence generated in the preceding step for triggering a measuring step to be performed by the measuring head.
- d. the measuring head detects a printed pattern which is part of the printed printout, and
- e. in the measuring unit, position information concerning the printout respectively transmitted by the printing unit is determined based on the pattern scanned by the measuring head,
- f. in the register control unit, correction values are calculated based on the position information determined by one or more measuring unit(s), and
- g. the correction values are transmitted to the drive units for operation thereof.
Dependencies are inferred from the claim text.