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 (ITM) having a plurality of magnetic markers, each marker being disposed at a different respective longitudinal location of the ITM;
b. an image forming station including a print bar disposed over the ITM and configured to form ink-images by deposition of droplets of ink on a surface of the ITM while the ITM circulates past the print bar; and
c. one or more magnetic-marker detector associated with the print-bar and configured to magnetically detect movement of the magnetic markers, wherein:
(i) the image forming station comprises a plurality of the print bars spaced from one another in a direction of motion of the ITM, and
(ii) the one or more magnetic-marker detectors comprises a plurality of magnetic-marker detectors such that each print bar of the plurality of print bars is associated with a respective magnetic-marker detector that is disposed in a fixed position relative to the print bar.
2. The system of claim 1 wherein the magnetic-marker detector is disposed in a fixed position relative to the print bar.
3. The system of claim 1 wherein the magnetic-marker detector is configured to detect the respective passages of each of the magnetic markers past the print-bar.
4. The printing system of claim 1 , wherein the marker detectors are
(i) disposed adjacent to the associated respective print bars and/or
(ii) disposed underneath the associated respective print bars and/or
(iii) mounted within and/or on a housing of the associated respective print bars.
5. An intermediate transfer member (ITM) for use in a printing system, the ITM comprising:
a. an endless flexible belt formed by a flat elongate strip of which the ends are secured to one another form a continuous loop, an outer surface of the flexible belt being hydrophobic and/or comprising a silicone material; and
b. plurality of magnetic markers that are longitudinally disposed along the flexible belt, wherein a flexibility of the belt longitudinally varies such that, at the seam location, a local rigidity exceeds a rigidity of the belt at locations away from the seam location.
6. The ITM of claim 5 wherein the magnetic markers reside on the ITM surface.
7. The ITM of claim 5 wherein the magnetic markers are a naked-eye-visible feature of the ITM outer surface.
8. The ITM of claim 5 wherein the flat elongate strip defines two lateral edges and wherein the magnetic markers are laterally disposed on the ITM surface between the two lateral edges of the strip.
9. The ITM of claim 5 wherein:
i. the flat elongate strip defines two lateral edges and has an upper surface corresponding to the belt outer surface; and
ii. upper surfaces of the markers are laterally disposed between the two lateral edges at a location that is not beneath an upper surface of the strip.
10. The ITM of claim 5 wherein, the ends are secured to one another at a seam location, and wherein at least one of the following is present at the seam location so at to secure the ends of the flat elongate strip to one another: tape, liquid adhesive, solder, and thermoplastic adhesive.
11. The ITM of claim 10 wherein tape is present at the seam location so at to secure the ends of the flat elongate strip to one another.
12. The ITM of claim 5 wherein (i) hydrophobic and/or silicone material is provided as part of a release layer of the belt, and (ii) beneath the release layer is a reinforcement or support layer from which the belt's strength is derived.
13. The ITM of claim 5 wherein (i) the hydrophobic and/or silicone material is provided as part of a release layer of the belt, and (ii) beneath the release layer is a reinforcement or support constructed from fabric.
14. The ITM of claim 5 , wherein: (i) a circumference of the belt is at least 5 mm; and (ii) the length of a marker, measured in the direction of movement of the intermediate transfer member, is at most 1%, of the circumference of the ITM.
15. The ITM of claim 5 wherein longitudinally spaced formations or bead(s) are disposed along each of the two lateral-edges of the strip to assist that are engageable to lateral guide channels of the printing system, and serve to guide the belt.
16. The ITM of claim 15 wherein the formations are formed by the teeth of one half of a zip fastener sewn, or otherwise secured, to each lateral edge of the belt.
17. A method of forming the ITM of claim 5 , the method comprising:
a. before the ends of the flat elongate strip are secured to one another, installing the strip in the printing system to pass over a plurality of rollers thereof; and
b. subsequently, connecting the ends of the flat elongate strip to each other to form the continuous loop of the ITM of claim 5 .
18. A method of printing comprising:
a. depositing ink images onto the outer surface of the belt of the ITM of claim 5 ; and
b. at an image forming station, transferring the images from the ITM to substrates, wherein during printing magnetic detectors disposed at the image formation station detect movement of the magnetic markers.
19. A printing system comprising:
a. the ITM of claim 5 ;
b. an image forming station including a print bar disposed over the ITM and configured to form ink-images by deposition of droplets of ink on a surface of the ITM while the ITM circulates past the print bar; and
c. a magnetic-marker detector associated with the print-bar and configured to magnetically detect movement of the magnetic markers, wherein the ITM is a flexible blanket having lateral projections along each edge that are received in guide channels of the printing system to maintain the blanket under lateral tension.
20. A printing system comprising:
a. the ITM of claim 5 ;
b. an image forming station including a print bar disposed over the ITM and configured to form ink-images by deposition of droplets of ink on a surface of the ITM while the ITM circulates past the print bar;
c. a magnetic-marker detector associated with the print-bar and configured to detect movement of the markers; and
d. electronic circuitry configured to monitor, in accordance with output of the magnetic-marker detector, at least one of: (i) temporal fluctuations of non-uniform stretching of the circulating ITM; (ii) variations in the length of the circulating ITM; (iii) a local ITM velocity of the circulating ITM in accordance with output of the magnetic-marker detector; and (iv) a local ITM stretch of the circulating ITM.
21. A method of monitoring an operating parameter, the method comprising:
a. providing a printing system comprising:
A. the ITM of claim 5 ;
B. an image forming station including a print bar disposed over the ITM and configured to form ink-images by deposition of droplets of ink on a surface of the ITM while the ITM circulates past the print bar; and
B. a magnetic-marker detector associated with the print-bar and configured to detect movement of the markers; and
b. monitoring, in accordance with the output of the marker detector, at least one operating parameter selected from the group consisting of: (i) temporal fluctuations of non-uniform stretching of the circulating ITM; (ii) variations in the length of the circulating ITM; (iii) a local ITM velocity of the circulating ITM; (iv) irregularities in the speed of movement of the ITM; and (v) local ITM stretch of the circulating ITM.
22. An intermediate transfer member (ITM) for use in a printing system, the ITM comprising:
a. an endless flexible belt formed by a flat elongate strip of which the ends are secured to one another form a continuous loop, an outer surface of the flexible belt being hydrophobic and/or comprising a silicone material; and
b. plurality of magnetic markers that are longitudinally disposed along the flexible belt,
wherein the belt outer surface comprises silanol-, sylyl- or silane-modified or terminated polydialkylsiloxane material or wherein the belt outer surface comprises amino silicones.
23. An intermediate transfer member (ITM) for use in a printing system, the ITM comprising:
a. an endless flexible belt formed by a flat elongate strip of which the ends are secured to one another form a continuous loop, an outer surface of the flexible belt being hydrophobic and/or comprising a silicone material; and
b. plurality of magnetic markers that are longitudinally disposed along the flexible belt,
wherein an elasticity thereof in the width ways direction exceeds an elasticity of the ITM in the length ways direction.
24. An intermediate transfer member (ITM) for use in a printing system, the ITM comprising:
a. an endless flexible belt formed by a flat elongate strip of which the ends are secured to one another form a continuous loop, an outer surface of the flexible belt being hydrophobic and/or comprising a silicone material; and
b. plurality of magnetic markers that are longitudinally disposed along the flexible belt, wherein the markers have an average separation of at most 5 cm, for an ITM having a circumference length of at least 1 meter.
25. The ITM of claim 24 wherein the ITM has a circumference length of at least 3 meters.
26. The ITM of claim 25 wherein the average separation is at most 2 cm.
27. An intermediate transfer member (ITM) for use in a printing system, the ITM comprising:
a. an endless flexible belt formed by a flat elongate strip of which the ends are secured to one another form a continuous loop, an outer surface of the flexible belt being hydrophobic and/or comprising a silicone material; and
b. plurality of magnetic markers that are longitudinally disposed along the flexible belt,
wherein markers are distributed throughout the JTM so that no location within at least a substantial proportion of the JTM is displaced, along the direction of motion of the JTM, from one of the markers by more than X %.
28. The ITM of claim 27 wherein a value of X is no more than 5%.
29. The ITM of claim 27 wherein a value of X is no more than 2.5%.
30. The ITM of claim 27 wherein a value of X is no more than 1%.