Reduced vibration printing press and method
AssigneeHeidelberger Druckmaschinen AG
InventorsGerald Roger Douillard, Mark Bernard Dumais, Michael Thomas Woroniak, John Allan Manley, John Antonios Panteleos, Charles Francis Svenson
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Abstract
A method for identifying a lateral position of a vibrator roll geared to a plate cylinder in a printing press includes the steps of sensing a reference lateral position of a vibrator roll, setting a counter to a setting corresponding to the reference lateral position of the vibrator roll and rotating a plate cylinder. The lateral position of the vibrator roll changes as a result of the rotating of the plate cylinder and the counter changes as a function of the rotating of the plate cylinder.
Claims15
A method for identifying a lateral position of a vibrator roll in a print unit having a plate cylinder comprising the steps of:
- sensing a reference lateral position of a vibrator roll;
- setting a counter to a setting corresponding to the reference lateral position of the vibrator roll;
- and
- rotating a plate cylinder, the lateral position of the vibrator roll changing as a result of the rotating, the counter changing as a function of the rotating of the plate cylinder.
A method for correcting a lateral position of a vibrator roll for a plate cylinder in a printing press comprising the steps of:
- sensing a reference lateral position of a vibrator roll;
- setting a counter to a setting corresponding to the reference lateral position of the vibrator roll;
- rotating a plate cylinder, the lateral position of the vibrator roll changing as a result of the rotating, the counter changing as a function of the rotating of the plate cylinder so as to correspond to an actual lateral position of the vibrator roll;
- determining a desired lateral position of the vibrator roll;
- comparing the actual lateral position of the vibrator roll to the desired lateral position of the vibrator roll;
- and
- rotating the plate cylinder 360 degrees if the actual lateral position differs from the desired lateral position by a predetermined amount.
A method for setting the proper register and vibrations of a printing press comprising the steps of:
- determining a good printed register position of a first set of opposing plate cylinders in a first color printing unit of a printing press and of a second set of opposing plate cylinders in a second color printing units of the printing press;
- removing the first set of opposing plate cylinders from impression;
- removing the second set of opposing plate cylinders from impression;
- pulling the web through the first and second color printing units using a nip;
- sending a last good printed register command to a controller to adjust the register of the first and second sets of opposing plate cylinders to the good printed register position;
- and
- determining vibrator stroke positions in the first and second printing units.
A device for identifying a vibrator roll stroke position with respect to a plate cylinder in a printing press comprising:
- a sensor sensing a reference lateral position of a vibrator roll;
- an incremental encoder for sensing rotation of a plate cylinder;
- a counter for counting an output of the incremental encoder;
- and
- a controller for rotating the plate cylinder, the controller receiving inputs from the sensor and the counter.
A printing press comprising:
- a first color print unit including first opposing plate cylinders, vibrator rolls geared to the first opposing plate cylinders, at least one first reference sensor for sensing reference lateral positions of the vibrator rolls, and at least one first angular sensor for determining angular positions of the first opposing plate cylinders;
- a second color print unit including second opposing plate cylinders, second vibrator rolls, at least one second reference sensor for sensing second reference lateral positions of the second vibrator rolls, and at least one second angular sensor for determining second angular position of the second opposing plate cylinders;
- and
- a controller for removing the first and second plate cylinders from impression, the controller receiving inputs from the first and second reference sensors and the first and second angular sensors so as to determine lateral positions of the vibrator rolls and second vibrator rolls.
A printing unit comprising:
- opposing plate cylinders,
- vibrator rolls geared to the opposing plate cylinders,
- at least one reference sensor for sensing reference lateral positions of the vibrator rolls,
- at least one first angular sensor for determining angular positions of the opposing plate cylinders;
- and
- a controller receiving inputs from the reference sensor and the angular sensor so as to determine and adjust lateral positions of the vibrator rolls.
Dependencies are inferred from the claim text.