A digital printing system

Patent metadata

Field	Value
Publication number	US-2022016880-A1
Application number	US-201917312394-A
Country	US
Kind code	A1
Filing date	Dec 19, 2019
Priority date	Dec 24, 2018
Publication date	Jan 20, 2022
Grant date	—

Abstract

A digital printing system (10) includes an intermediate transfer member (ITM) (44) which is configured to receive a printing fluid so as to form an image, a continuous target substrate (50), and a processor (20). The continuous target substrate (50) is configured to engage with the ITM (44) at an engagement point (150) for receiving the image from the ITM (44), at the engagement point (150), the ITM (44) is configured to move at a first velocity and the continuous target substrate (50) is configured to move at a second velocity. The processor (20) is configured to match the first velocity and the second velocity at the engagement point (150).

First claim

1 . A digital printing system, comprising:
an intermediate transfer member (ITM), which is configured to receive a printing fluid so as to form an image; a continuous target substrate, which is configured to engage with the ITM at an engagement point for receiving the image from the ITM, wherein, at the engagement point, the ITM is configured to move at a first velocity and the continuous target substrate is configured to move at a second velocity; and a processor, which is configured to match the first velocity and the second velocity at the engagement point.

2 . (canceled)

3 . The system according to claim 1 , and comprising first and second drums, wherein the first drum is configured to rotate at a first direction and first rotational velocity so as to move the ITM at the first velocity, and wherein the second drum is configured to rotate at a second direction and at a second rotational velocity so as to move the continuous target substrate at the second velocity, and wherein the processor is configured to engage and disengage between the ITM and the continuous target substrate at the engagement point by displacing one or both of the first drum and the second drum.

4 . The system according to claim 3 , wherein the processor is configured to receive an electrical signal indicative of a difference between the first and second velocities, and, based on the electrical signal, to match the first and second velocities.

5 . The system according to claim 3 , wherein the processor is configured to set at least one operation selected from a list consisting of (a) timing of engagement and disengagement between the first and second drums, (b) a motion profile of at least one of the first and second drums, and (c) a size of a gap between the disengaged first and second drums.

6 . The system according to claim 1 , and comprising an electrical motor configured to move one or both of the ITM and the target substrate, wherein the processor is configured to receive a signal indicative of a temporal variation in an electrical current flowing through the electrical motor, and to match the first velocity and the second velocity responsively to the signal.

7 . The system according to claim 6 , wherein the processor is configured to match the first velocity and the second velocity by reducing the temporal variation in the electrical current.

8 . The system according to claim 6 , wherein the temporal variation comprises a slope of the electrical current as a function of time, across a predefined time interval.

9 . The system according to claim 6 , wherein the processor is configured to compensate for a thermal expansion of at least one of the first and second drums by reducing the temporal variation in the electrical current.

10 . The system according to claim 6 , wherein the continuous target substrate comprises a first substrate having a first thickness, or a second substrate having a second thickness, different from the first thickness, and wherein the processor is configured to compensate for the difference between the first thickness and the second thickness by reducing the temporal variation in the electrical current.

11 . The system according to claim 1 , wherein the ITM is formed of a loop that is closed by a seam section, and wherein the processor is configured to prevent physical contact between the seam section and the continuous target substrate, by:
causing temporary disengagement between the ITM and the continuous target substrate during time intervals in which the seam section traverses the engagement point; and backtracking the continuous target substrate during the time intervals, so as to compensate for the temporary disengagement.

12 . The system according to claim 11 , and comprising a backtracking mechanism, which is configured to backtrack the continuous target substrate, and which comprises at least first and second displaceable rollers having a physical contact with the continuous target substrate and configured to backtrack the continuous target substrate by moving the rollers relative to one another.

13 - 20 . (canceled)

21 . A method, comprising:
receiving a printing fluid on an intermediate transfer member (ITM), so as to form an image; engaging a continuous target substrate with the ITM at an engagement point for receiving the image from the ITM, and, at the engagement point, moving the ITM at a first velocity and moving the continuous target substrate at a second velocity; and matching the first velocity and the second velocity at the engagement point.

22 . (canceled)

23 . The method according to claim 21 , and comprising rotating a first drum at a first direction and first rotational velocity so as to move the ITM at the first velocity, and rotating a second drum at a second direction and second rotational velocity so as to move the continuous target substrate at the second velocity, and engaging and disengaging between the ITM and the continuous target substrate at the engagement point by displacing one or both of the first drum and the second drum.

24 . The method according to claim 21 , wherein matching the first velocity and the second velocity comprises receiving an electrical signal indicative of a difference between the first and second velocities, and, based on the electrical signal, matching the first and second velocities.

25 . The method according to claim 23 , wherein matching the first and second velocities comprises setting at least one operation selected from a list consisting of (a) timing of engagement and disengagement between the first and second drums, (b) a motion profile of at least one of the first and second drums, and (c) a size of a gap between the disengaged first and second drums.

26 . The method according to claim 21 , and comprising moving one or both of the ITM and the target substrate using an electrical motor, and receiving a signal indicative of a temporal variation in an electrical current flowing through the electrical motor, and wherein matching the first velocity and the second velocity comprises matching the first velocity and the second velocity responsively to the signal.

27 . The method according to claim 26 , wherein matching the first velocity and the second velocity comprises reducing the temporal variation in the electrical current.

28 . The method according to claim 26 , wherein the temporal variation comprises a slope of the electrical current as a function of time, across a predefined time interval.

29 . The method according to claim 26 , wherein matching the first velocity and the second velocity comprises compensating for a thermal expansion of at least one of the first and second drums by reducing the temporal variation in the electrical current.

30 . The method according to claim 26 , wherein the continuous target substrate comprises a first substrate having a first thickness, or a second substrate having a second thickness, different from the first thickness, and wherein matching the first velocity and the second velocity comprises compensating for the difference between the first thickness and the second thickness by reducing the temporal variation in the electrical current.

31 . The method according to claim 21 , wherein the ITM is formed of a loop that is closed by a seam section, and comprising preventing physical contact between the seam section and the continuous target substrate, by:
causing temporary disengagement between the ITM and the conti

Assignees

• Landa Corp Ltd

Inventors

• Landa Benzion
• Zarmi Nir
• Siman Tov Alon
• Keren Abraham
• Zakharin Yevgeny
• Gruetter Ulrich
• Strasser Georg
• Stein Yoav
• Reznikov Polsman Ola

Classifications

• B41J2002/012

  with intermediate transfer member · CPC title

• B41J2/01

  Ink jet · CPC title

• G03G15/50

  Machine control of apparatus for electrographic processes using a charge pattern, e.g. regulating differents parts of the machine, multimode copiers, microprocessor control (sequencing control G03G21/14) · CPC title

• G03G15/1615 Primary

  relating to the driving mechanism for the intermediate support, e.g. gears, couplings, belt tensioning · CPC title

• G03G2215/00949

  Copy material feeding speed switched according to current mode of the apparatus, e.g. colour mode · CPC title