Apparatus and method for control or monitoring a printing system
Embodiments of the present invention relate to control apparatus and methods of a printing system, for example, comprising an intermediate transfer member (ITM) and to user-related features of a printing system. Some embodiments relate to regulation of a velocity and/or tension and/or length of the ITM. Some embodiments relate to regulation of deposition of ink on the moving ITM. Some embodiments regulate to apparatus configured to alert a user of one or more events related to operation of the ITM. Some embodiments relate to a time-line GUI for visualizing and/or manipulating queued print jobs which may be employed. Some embodiments relate to a reversed augmented reality GUI for visualization and/or control of the printing system. In some embodiments, a display screen is mounted to a printer housing and/or able to control access to moving parts of a printing system.
1. A printing system comprising: a. an intermediate transfer member of non-constant length; b. an image forming station configured to deposit ink on a surface of the intermediate transfer member while the intermediate transfer member moves so as to form ink images on the surface of the intermediate transfer member; c. a transfer station configured to transfer the ink images from the surface of the moving intermediate transfer member to a substrate passing in between the transfer member and an impression cylinder during a period of engagement; and d. electronic circuitry configured to regulate a length of the intermediate transfer member to a set-point length, wherein the set-point length equals an integral multiple of a circumference of the impression cylinder.
2. A printing system comprising:
a. an intermediate transfer member (ITM) having a blanket seam;
b. an image forming station configured to form ink images upon a surface of the intermediate transfer member as the intermediate transfer moves so that ink images are transported thereon to an impression station where the images are transferred from the ITM surface to substrate; and
c. a sensor configured to detect times at which the blanket seam passes the sensor.
3. The system of claim 2 wherein the formation of the ink images is controlled so as to start images on the ITM as close to a location of the blanket seam as feasible.
4. The system of claim 3 wherein the formation of the ink images is controlled so that a location of the blanket seam remains in the same position relative to the printing images in consecutive rotation-cycles of the ITM.
5. A printing system comprising:
a. an intermediate transfer member having a blanket seam;
b. an image forming station configured to form ink images upon a surface of the intermediate transfer member as the intermediate transfer moves so that ink images are transported thereon to an impression station where the images are transferred from the ITM surface to substrate; and
wherein the formation of the ink images is controlled so that a location of the blanket seam remains in the same position relative to the printing images in consecutive rotation-cycles of the ITM.
6. The system of claim 5 wherein
i. the impression station comprises a rotating impression cylinder having a discontinuity on a surface thereof; and
ii. relative motion of the ITM relative to the impression cylinder is controlled so that the times when the blanket seam passes the impression cylinder always coincides with a time that the discontinuity of the impression cylinder faces the ITM.
7. The system of claim 6 wherein a length of the ITM equals a whole number multiple of the circumference of the impression cylinder.
8. The system of claim 5 wherein the formation of the ink images is controlled so as to start images on the ITM as close to a location of the blanket seam as feasible.
9. The system of claim 8 further comprising a sensor configured to detect times at which the blanket seam passes the sensor.
10. The system of claim 5 wherein ends of the ITM are adhesively fastened to each other at a location of the blanket seam.
11. A method of operating a printing system comprising a rotating intermediate transfer member (ITM) having a blanket seam, the method comprising:
a. at an image forming station, forming ink images upon a surface of the intermediate transfer member as the intermediate transfer moves so that ink images are transported thereon to an impression station;
b. at the impression station, transferring the ink images to substrate, wherein the method includes tracking at least one of:
i. a location of the blanket seam; and
ii. a relative phase difference between the blanket seam and a surface discontinuity of a rotating impression cylinder disposed at the impression station.
12. The method of claim 11 wherein the ink images are formed at the image forming station such that:
i. there are an integral number of ink images on an ITM; and
ii. no ink image is applied to the ITM at the blanket seam thereof.
13. The method of claim 11 wherein the ITM repeatedly engage to and disengage from the impression cylinder by motion of at least a portion of ITM towards cylinder and/or by motion of the cylinder towards at least a portion of ITM.
14. The method of claim 11 wherein the printing system is operated so as to avoid engaging the ITM to the impression cylinder at a time when the blanket seam is aligned with impression cylinder.
15. The method of claim 14 wherein the printing system is operated so as to allow seam to pass by impression cylinder during a period-of-time when the ITM is disengaged from the impression cylinder.
16. The method of claim 14 wherein the avoiding of the engaging of the ITM to the impression cylinder at the time when the blanket seam is aligned with the impression cylinder is accomplished by performing at least one of:
(i) regulating a length of the ITM to an appropriate set-point length; and
(ii) by temporarily modifying a velocity of at least a portion of the ITM.
17. The method of claim 11 wherein a length of the ITM is an integral multiple of a circumference of the of the impression cylinder.
18. The method of claim 11 wherein ends of the ITM are adhesively fastened to each other at a location of the blanket seam.