System and method for modifying operation of an inkjet printer to accommodate changing environmental conditions
View Patent ↗An inkjet printer operates to produce a print with at least one component operating at less than a normal operating parameter. The printer identifies an image density for an image to be printed and operates the printer with operational parameters different than normal operational parameters to enable printing operations before all of the components in the printer reach their operational parameters.
1. An inkjet printer configured to print images with phase change ink comprising:
an inkjet printhead having a plurality of inkjet ejectors;
an imaging member positioned to receive ink ejected from the inkjet printhead as the imaging member rotates past the inkjet printhead;
a transfix roller configured to move towards and away from the imaging member to form a nip with the imaging member selectively;
an electrical circuit operatively connected to the plurality of inkjet ejectors to deliver firing signals to the inkjet ejectors selectively;
a heater positioned proximate a media transport path in the inkjet printer, the heater being configured to heat media before the media reaches the nip formed with the transfix roller and the imaging member;
a processor configured to receive image data representative of an image to be printed and to measure a density of the image to be printed;
a plurality of temperature sensors, at least one temperature sensor being positioned proximate to each of the inkjet printhead, the imaging member, the transfix roller, and the heater to measure a temperature for each of the inkjet printhead, the imaging member, the transfix roller, and the heater, respectively; and
a controller operatively connected to the electrical circuit, the transfix roller, the imaging member, the heater, the processor, and the plurality of temperature sensors, the controller being configured to operate the inkjet printer with reference to a first group of operational parameters in response to each of the temperature sensors measuring a temperature that corresponds to one of an operational inkjet printhead temperature, an operational imaging member temperature, an operational transfix roller temperature, and an operational heater temperature and to operate the inkjet printer with a second group of operational parameters in response to at least one of the temperature sensors measuring a temperature that corresponds to a temperature that is less than at least one of the operational inkjet printhead temperature, the operational imaging member temperature, the operational transfix roller temperature, and the operational heater temperature, respectively.
2. The inkjet printer of claim 1 , the controller being further configured to operate the inkjet printer with reference to the second group of operational parameters in response to the measured density of an image to be printed being less than a predetermined density.
3. The inkjet printer of claim 1 wherein the second group of operational parameters include a transfix pressure, a transfix speed, an imaging member speed, a firing signal waveform, an ink drop mass, an image resolution, and a media transport speed.
4. The inkjet printer of claim 3 , the controller being further configured to modify at least one operational parameter in the second group of operational parameters with reference to an interpolation between an operational parameter in the first group of operational parameters and a corresponding operational parameter in the second group of operational parameters.
5. The inkjet printer of claim 4 , the controller being configured to modify the transfix pressure in the second group of operational parameters with reference to the measured temperatures received from the temperature sensors and each of the operational temperatures until the operational temperatures for each of the operational parameters is reached.
6. The inkjet printer of claim 4 , the controller being configured to modify the transfix speed in the second group of operational parameters with reference to the measured temperatures received from the temperature sensors and each of the operational temperatures until the operational temperatures for each of the operational parameters is reached.
7. The inkjet printer of claim 4 , the controller being configured to modify a voltage of the firing signal waveform in the second group of operational parameters with reference to the measured temperatures received from the temperature sensors and each of the operational temperatures until the operational temperatures for each of the operational parameters is reached.
8. The inkjet printer of claim 4 , the controller being configured to modify the imaging member speed in the second group of operational parameters with reference to the measured temperatures received from the temperature sensors and each of the operational temperatures until the operational temperatures for each of the operational parameters is reached.
9. The inkjet printer of claim 4 , the controller being configured to modify the media transport speed in the second group of operational parameters with reference to the measured temperatures received from the temperature sensors and each of the operational temperatures until the operational temperatures for each of the operational parameters is reached.
10. The inkjet printer of claim 1 , the controller being further configured to modify an order of images to be printed with reference to the measured density of each image received from the processor.
11. An inkjet printer comprising:
a processor configured to measure a density of an image to be printed;
at least one temperature sensor configured to measure a temperature within the printer; and
a controller operatively connected to the temperature sensor and to the processor, the controller being configured to operate the inkjet printer with reference to a first group of operational parameters in response to the measured temperature received from the temperature sensor being equal to or greater than a predetermined temperature and to operate the inkjet printer with at least one modified operational parameter in the first group of operational parameters in response to the measured temperature received from the temperature sensor being less than the predetermined temperature and the measured density of an image to be printed being less than a predetermined density, the first group of operational parameters including a transfix pressure, a transfix speed, an imaging member speed, a firing signal waveform, an ink drop mass, an image resolution, and a media transport speed.
12. The inkjet printer of claim 11 , the controller being further configured to interpolate the modification of the at least one operational parameter with reference to an interpolation between a minimum operational parameter at a first temperature and the operational parameter.
13. The inkjet printer of claim 12 , the controller being configured to increase the transfix pressure in the first group of operational parameters with reference to the measured temperature received from the temperature sensor, the first temperature, and the predetermined temperature until the predetermined temperature is reached.
14. The inkjet printer of claim 12 , the controller being configured to decrease the transfix speed in the first group of operational parameters with reference to the measured temperature received from the temperature sensor, the first temperature, and the predetermined temperature until the predetermined temperature is reached.
15. The inkjet printer of claim 12 , the controller being configured to increase a voltage of the firing signal waveform in the first group of operational parameters with reference to the measured temperature received from the temperature sensor, the first temperature, and the predetermined temperature until the predetermined temperature is reached.
16. The inkjet printer of claim 12 , the controller being configured to increase the imaging member speed with reference to the measured temperature received from the temperature sensor, the first temperature, and the predetermined temperature until the predetermined temperature is reached.
17. The inkjet printer of claim 12 , the controller being configured to increase the media transport speed with reference to the measured temperature received from the temperature sensor, the first temperature, and the predetermined temperature until the predetermined temperature is reached.
18. The inkjet printer of claim 11 , the controller being further configured to modify an order of images to be printed with reference to the measured density of each image received from the processor.