Method of controlling a vibrator roller in a printing press
AssigneeHeidelberger Druckmaschinen AG
InventorRudi Junghans
Life of this patent
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Abstract
A method of controlling a vibrator roller in a printing press during printing press stops and printing starts is disclosed. The cycle of the vibrator roller is controlled as a function of the point of time at which the vibrator roller contacts the ink fountain roller, in order to achieve a uniform inking after a printing press stop.
Claims13
A method of controlling a vibrator roller in a printing press during interruption and resumption of printing, the vibrator roller being driven by a driver to move through a cycle between an ink fountain roller and an ink distribution roller to transfer ink from the ink fountain roller to the ink distribution roller, the cycle having a plurality of positions, the cycle comprising at least the phases of:
- phase i) moving the vibrator roller from the ink distribution roller to the ink fountain roller;
- phase ii) holding the vibrator roller in contact with the ink fountain roller for a first period of contact to pick up ink onto the vibrator roller;
- phase iii) moving the vibrator roller from the ink fountain roller to the ink distribution roller;
- and phase iv) holding the vibrator roller in contact with the ink distribution roller for a second period of contact to transfer ink from the vibrator roller to the ink distribution roller;
- said method comprising the steps of:
- a) stopping the ink fountain roller when the printing is interrupted, said interrupting of printing comprising the stopping of ink impression transfer from a blanket cylinder to a material to be printed upon;
- b) determining the position in the cycle of the vibrator roller driver when the printing is interrupted;
- c) holding the vibrator roller in contact with the ink distribution roller during said interruption of printing;
- d) stopping the vibrator roller driver;
- and
- e) substantially simultaneously restarting the driver of the vibrator roller at the determined position of the cycle as determined in step b) and restarting the ink fountain roller when printing is resumed and the material to be printed on is fed to the blanket cylinder.
A method of controlling a vibrator roller in a printing press during interruption and resumption of printing, the vibrator roller being driven by a device to drive the vibrator roller to move through a cycle between an ink fountain roller and an ink distribution roller to transfer ink from the ink fountain roller to the ink distribution roller, the cycle having a plurality of positions, said cycle comprising at least the phases of:
- phase i) moving the vibrator roller from the ink distribution roller to the ink fountain roller;
- phase ii) holding the vibrator roller in contact with the ink fountain roller for a first period of contact to pick up ink onto the vibrator roller;
- phase iii) moving the vibrator roller from the ink fountain roller to the ink distribution roller;
- and phase iv) holding the vibrator roller in contact with the ink distribution roller for a second period of contact to transfer ink from the vibrator roller to the ink distribution roller;
- said method comprising the steps of:
- a) interrupting printing by stopping ink impression transfer from a blanket cylinder to a material to be printed;
- b) interrupting the cycle of movement of the vibrator roller by stopping the device to drive the vibrator roller;
- c) determining the position in the cycle of the vibrator roller in the cycle when printing is interrupted;
- d) resuming printing by feeding material to be printed to the blanket cylinder;
- and
- e) starting the vibrator roller, when printing is resumed, at a position based on the determined position of the cycle as determined in step c).
A method of controlling a vibrator roller in a printing press during interruption and resumption of printing, said method comprising the steps of:
- a) moving the vibrator roller by a driver device through a cycle between an ink fountain roller and an ink distribution roller to transfer ink from the ink fountain roller to the ink distribution roller, the cycle having a plurality of phases;
- b) said step of moving the vibrator roller by a driver device through a cycle comprising at least the phases of:
- phase i) moving the vibrator roller from the ink distribution roller to the ink fountain roller;
- phase ii) holding the vibrator roller in contact with the ink fountain roller for a first period of contact to pick up ink onto the vibrator roller;
- phase iii) moving the vibrator roller from the ink fountain roller to the ink distribution roller;
- and
- phase iv) holding the vibrator roller in contact with the ink distribution roller for a second period of contact to transfer ink from the vibrator roller to the ink distribution roller;
- c) interrupting printing by stopping ink impression transfer from a blanket cylinder to a material to be printed upon;
- d) interrupting said step of moving the vibrator roller within said vibrator roller cycle;
- e) stopping the driver device of the vibrator roller to thus stop the vibrator roller;
- f) determining the phase reached by said vibrator roller driver device in said vibrator roller cycle upon said interrupting of the printing;
- g) starting the vibrator roller driver device, upon printing being resumed, at the determined phase of said vibrator roller cycle as determined in step f);
- and
- h) resuming printing, upon said starting of the vibrator roller driver device, by resuming ink impression transfer to the material to be printed on, by feeding the material to the blanket cylinder.
Dependencies are inferred from the claim text.