Patent Grant
7845787
A conventional high speed printer has limited ability to change print modes during the printing process while retaining the ability to produce printed recording medium at a high rate of sheets per minute. This limited flexibility is a problem when a desired print job must contain a variety of print recording medium types where different recording medium types require a change in imaging or printing parameters. The high rate of sheets per minute creates a situation where the image to be printed may already be on the imaging drum before a print recording medium sensor can sense the type of recording medium upon which the image is to be printed.
The ability to print in various modes is a conventional printer feature. For example, a printer user may be presented with mode choices such as: draft, fast color, enhanced color, or photograph. Further, a conventional printer may provide recording medium settings such as: paper or transparency. Any of these settings may be selected by the user at some point in the process of setting up a print job.
The proper combination of settings produces the best image vibrancy and durability for the print medium being used. For example, in a solid ink color printer, different amounts of ink are needed depending on the background color of the print recording medium. Conventionally, more coverage is needed (requiring more ink) for a transparency since light will penetrate the transparency to produce the image. On the other hand, white paper provides a reflecting background and the appropriate color gamut can be generated with much less ink coverage compared to that needed with a transparency.
A problem arises when a setting selected by a user is incompatible with the actual print medium that is being used. For example, a user may desire to print a paper set of transparencies so as to be distributed to the attendees of a presentation. However, instead of using the printer driver, most customers choose to just insert the transparencies into the printer and print as if it was a paper job. This causes the job to print in paper mode vs. transparency mode, which results in an unnecessary degradation in print quality.
Another example of a problem of a setting selected by a user being incompatible with the actual print medium is the printing of an image on photographic paper. As noted above, human error, due to a failure to change the mode of the printer to a photographic paper mode, may cause the printing of the image in paper mode rather than photographic paper mode, thereby resulting in an unnecessary degradation in print quality.
Therefore, it is desirable to provide a print system wherein instead of having the user program the recording medium mode settings, a user only needs to load the recording medium into the printer and the proper mode is automatically used to print on the job. Moreover, it is desirable to provide a printer that senses the type of recording medium being used, and based upon the sensed recording medium type adjust parameters of the printing process; e.g., adjusting the image already on the imaging drum; adjusting the transfer properties such as the transfix speed (velocity), drum temperature, media preheat temperature, or nip pressure; adjusting ink coverage; adjusting the amount of marking material used to render the image; and/or adjusting the drum's electrical parameters, etc.
The drawings are only for purposes of illustrating an embodiment and is not to be construed as limiting, wherein:
For a general understanding, reference is made to the drawings. In the drawings, like references have been used throughout to designate identical or equivalent elements. It is also noted that the drawings may not have been drawn to scale and that certain regions may have been purposely drawn disproportionately so that the features and concepts could be properly illustrated.
As noted above, it is desirable to provide a print system wherein instead of having the user program the recording medium mode settings, a user only needs to load the recording medium into the printer and the proper mode is automatically used to print on the job. Moreover, it is desirable to provide a printer that senses the type of recording medium being used, and based upon the sensed recording medium type adjust parameters of the printing process; e.g., adjusting the image already on the imaging drum; adjusting the transfer properties such as the transfix speed (velocity), drum temperature, media preheat temperature, or nip pressure; adjusting ink coverage; adjusting the amount of marking material used to render the image; and/or adjusting the drum's electrical parameters, etc.
In the specific example of
If the transfix velocity does not match the transfix velocity required by the sensed recording medium type, the velocity of the transfix roller is adjusted to match the transfix velocity required by the sensed recording medium type at step S105. If the transfix velocity does match the transfix velocity required by the sensed recording medium type, the image is transfixed to the recording medium at step S106.
As noted above,
With respect to enhancing the marking material of the image on the imaging drum, a print system may be required to increase the amount of marking material on the imaging drum to a level required for the recording medium type. For example, if the sensed recording medium type is transparency and the image characteristics of the image on the imaging drum correspond to a recording medium type of paper, the print system will change the image on the drum. One such thing would be to increase the amount of marking material on the imaging drum to a level appropriate for a transparency. It is noted that if the sensed recording medium type is transparency and the image characteristics of the image on the imaging drum correspond to a recording medium type of paper, the print system may also adjust the drum temperature, adjust ink coverage, adjust the drum's electrical parameters, and/or adjust exposure properties, depending on the type of printing system being utilized the necessary adjustment needed to bring the state of the printing system into conformance with the sensed recording medium type.
It is noted that a solid ink print system can increase the amount of marking material on the imaging drum by simply subjecting the imaging drum to more depositions of solid ink through more drum revolutions of the imaging drum thereon. Moreover, it is noted a xerographic print system can increase the amount of marking material on the imaging drum by simply subjecting the imaging drum to a second imaging and development of the latent image with toner. It is also noted that a sub-pixel increment may be used for the second pass.
It is noted that in order to increase the amount of marking material on the imaging drum, it is necessary for the print system to retain the image until the marking material of the image is finally enhanced.
It is further noted that by enhancing the amount of the marking material of the image, the imaging drum may require the arresting or slowing of the movement of the recording medium.
It is noted that although
The recording medium control rollers 250 are used to control the motion of the recording medium in the recording medium path 220, and along with the drum or belt 210, can be modified to arrest the motion of the recording medium or slow the motion of the recording medium. The drum or belt 210 can be modified to allow for enhancing the amount of marking material on the imaging drum 210 as described above. The transfix roller 230 applies pressure to the recording medium to cause the image from the imaging drum 210 to the recording medium. The print head 200 is responsible for transmitting the solid ink to the imaging drum 210. It is noted that in color xerography, the imaging drum 210 may receive the marking material of each color layer from different belts containing different color toners and the transfer to paper would be an electrostatic process.
The user interface 290 communicates with the print control unit 260 via a communication channel 295. The user interface 290 can be used to toggle the print system between an auto sensing mode; the auto sensing mode including the recording medium type being sensed, the amount of marking material on the imaging drum being adjusted based upon the sensed recording medium type and/or the transfix being adjusted speed based upon the sensed recording medium type; and a manual mode wherein a user may override the normal settings for a particular recording medium type.
In one example, the printing system prepares a marking material image for rendering onto a paper based recording medium. Thereafter, the printing system senses a transparency based recording medium in lieu of a paper based recording medium. In response to the sensed transparency based recording medium, the printing system overlays another marking material image for rendering onto a paper based recording medium such that the drum used to transfer the marking material to the recording medium has thereon the equivalent of two marking material images for rendering onto a paper based recording medium.
In another example, the printing prepares a default marking material image. Thereafter, the printing system senses the type of recording medium. In response to the sensed type of recording medium, the printing system overlays additional marking material so as to enable rendering onto the sensed type of recording medium.
In a third example, if a transparency is detected and part or all of a paper image is already on the drum, the printer adds more ink to the drum and decreases the transfix velocity during transfix to make a high quality transparency print.
In summary, a print system senses the type of a recording medium and modifies the amount of marking material on the imaging drum when the sensed the recording medium type requires a modification of the parameters of the printing process. The print system may also, when the sensed the recording medium type requires a modification to the parameters of the printing process, adjust the image already on the imaging drum, adjust the transfer properties (such as the transfix speed (velocity), drum temperature, media preheat temperature, or nip pressure), adjust ink coverage, adjust the amount of marking material used to render the image, and/or adjust the drum's electrical parameters.
It will be appreciated that various of the above-disclosed and other features and functions, or alternatives thereof, may be desirably combined into many other different systems or applications. Also that various presently unforeseen or unanticipated alternatives, modifications, variations or improvements therein may be subsequently made by those skilled in the art which are also intended to be encompassed by the following claims.
| Number | Name | Date | Kind |
|---|---|---|---|
| 6016419 | Hirai | Jan 2000 | A |
| 6154621 | Yamamoto et al. | Nov 2000 | A |
| 6400912 | Tanaka et al. | Jun 2002 | B1 |
| 7360887 | Konno | Apr 2008 | B2 |
| Number | Date | Country | |
|---|---|---|---|
| 20080145074 A1 | Jun 2008 | US |
