The present invention relates to a printing module comprising a first imaging device and a slot for accommodating an optional second imaging device. Further, the present invention relates to an ink supply module comprising a slot for accommodating an optional drying / fixation apparatus, and a second ink supply device. Also, the ink supply module and the printing module comprise ink inlet/outlet ports such that the optional second imaging device in the printing module, if present, can be supplied ink from the second ink supply in the ink supply module when the printing module and the ink supply module are combined to form a printer.
B41J 3/54 - Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed with two or more sets of type or printing elements
B41J 11/00 - Devices or arrangements for supporting or handling copy material in sheet or web form
A method of nozzle failure detection in an ink jet printer having a plurality of ejection units (E) each of which comprises a nozzle (14) and an associated liquid chamber with an electromechanical transducer for energizing a pressure wave in the liquid chamber so as to expel an ink droplet from the nozzle (14), the method comprising steps of nozzle failure detection to be performed, for each ejection unit, with a given minimum detection frequency, wherein each nozzle failure detection step comprises: -energizing the transducer with a waveform that does not lead to the ejection of a droplet but creates a pressure fluctuation that is sensitive to whether or notthe ejection unit is in a malfunction state; and -measuring the pressure fluctuation in order to detect the malfunction state, the method comprising: -defining a mask pattern (22) that is independent of image contents to be printed, said mask pattern defining positions of blank pixels (24) on a dark background (26) such that the blank pixels are evenly distributed over an area of an image (20), wherein one blank pixel occurs in each pixel column printed with one of the nozzles (14);and -when an image is being printed, performing the nozzle failure detection steps for each ejection unit at timings at which the respective nozzles (14) are in pixel positions that belong to the mask pattern (22).
B41J 2/045 - Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
A duplex printing method comprising, for each duplex copy to be printed, the steps of: a) determining an amount of shrinkage of a media sheet (58) onto which a front side image has been printed; b) scaling an image to be printed on a back side of the sheet (58) with a scaling function that depends upon the determined shrinkage; and c) printing the scaled image on the back side of the sheet (58), wherein the step a) comprises the steps of: a1)predicting a shrinkage of a media sheet (58) on the basis of process parameters that characterize a process of printing the front side image and on the basis of a model that is defined by a set of model parameters and describes a dependence of the shrinkage on the process parameters (P), said process parameters including at least an amount of marking material to be applied to the front side of the sheet (58), a2) measuring (60) an actual shrinkage of the sheet; and a3)adjusting the model parameters (M, M') based on a comparison between the predicted shrinkage (S) and the measured shrinkage (A) to improve a prediction of a shrinkage for a subsequent sheet.
G03G 15/23 - Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups specially adapted for copying both sides of an original or for copying on both sides of a recording or image-receiving material
B41J 29/393 - Devices for controlling or analysing the entire machine
A deflecting device (1) for deflecting a conveyed sheet comprises a guiding assembly (40) having an inlet (41) for receiving a conveyed sheet from an upstream section (61) of a main conveying path, a primary outlet (42) for discharging a conveyed sheet onto a downstream section (62) of a main conveying path, a secondary outlet (43) for discharging a conveyed sheet onto an initial section (63) of a side conveying path, and a passing area (65) for passing a conveyed sheet from the inlet (41) towards the primary outlet (42); and a deflector (50) for deflecting a conveyed sheet towards the secondary outlet (43), movable into a receiving position for receiving a leading edge of a conveyed sheet inside the passing area (65) and movable into a discharge position (P2) for discharging a leading edge of a conveyed sheet towards the secondary outlet (43), wherein the deflector (50) defines a curved trajectory (66) for a conveyed sheet deflected towards the secondary outlet (43) in the discharge position (P2), wherein one side (66a) of the curved trajectory (66) faces the primary outlet (42). A functional portion (53) of the deflector is configured to be inserted into the passing area (65) on the one side (66a) of the curved trajectory (66) when the deflector (50) moves into the receiving position, and to be retracted from the passing area (65) on the one side (66a) of the curved trajectory (66) when the deflector (50) moves out of the discharge position (P2).
B41J 3/60 - Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed for printing on both faces of the printing material
B41J 13/00 - Devices or arrangements specially adapted for supporting or handling copy material in short lengths, e.g. sheets
A method for controlling an inkjet printer is provided. The printer comprises a reciprocating print head that applies a curable ink on a substrate in an at least two-pass print process. A print mask is applied to determine which dot positions are addressed in a pass of the print head. The ink is positionally fixed in a fixing step directly after application and cured in a curing step on a part of the substrate where the application of ink is completed. The level of fixing is adjustable and an amount of clustering of pixels in the print mask related to a print mode, associated with the level of fixing, is varied in dependence on the level of fixing.
A method of operating a droplet ejection device comprising an ejection unit arranged to eject droplets of a liquid and comprising a nozzle (22) formed in a nozzle face (24), a liquid duct (16) connected to the nozzle (22), and an electro-mechanical transducer (28) arranged to create an acoustic pressure wave in the liquid in the duct (16), wherein the liquid and the material constituting the nozzle face (24) are paired such that the liquid is wetting for the nozzle face (24), characterized by a step of monitoring a parameter that represents a state of a liquid pool (30) formed on the nozzle face (24) around the nozzle (22), and a step of enabling the ejection unit to operate as long as the pool (30) is present and the monitored parameter is within a predetermined range.
B41J 2/045 - Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
A method of operating a droplet ejection device comprising an ejection unit arranged to eject droplets of a liquid and comprising a nozzle (22) formed in a nozzle face (24), a liquid duct (16)connected to the nozzle (22), and an electro-mechanical transducer (28) arranged to create an acoustic pressure wave in the liquid in the duct (16), characterized by a step of detecting low-viscosity liquid on the nozzle face (24) by analyzing a signal (S) obtained from the transducer (28).
B41J 2/045 - Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
The invention provides a controller for a multi-roll printer, a printing system with such a printer and such a controller and a method for controlling such a printer. A user may assign print jobs directly to one of the rolls by assigning graphical representations (53, 4) of the print jobs to regions (A1, A2) corresponding to those rolls in a GUI (121). The user may also assign print jobs to a region (A3) in the GUI (121) that is not associated with any particular roll, as a result of which each image of said print job is individually assigned automatically to at least one of the rolls.
G06F 3/0481 - Interaction techniques based on graphical user interfaces [GUI] based on specific properties of the displayed interaction object or a metaphor-based environment, e.g. interaction with desktop elements like windows or icons, or assisted by a cursor's changing behaviour or appearance
A method of editing a print document, comprising an impositioning step for determining positions of print objects in a document to be printed, the positions being determined in view of a later step of finishing the document after printing, the method comprising steps of: a) providing document data on a client computer (10); b) sending document data to a cloud computer (24) and requesting the cloud computer to perform the impositioning step; and c) sending the impositioned document data to a printer for printing the document; characterized in that: - step a) comprises a sub-step of splitting the document data into contents data (18) and box information data (16), the box information data (16) specifying shapes and dimensions and intended positions of the print objects; - in step b), only the box information data (16) are sent to the cloud computer (24); and - when the cloud computer (24) has performed the impositioning step on the box information data, the impositioned box information data (16') are merged with the contents data either in the client computer (10) or at the printer.
ROLL-FED PRINTING APPARATUS, RASTER IMAGE PROCESSOR, SOFTWARE MEDIUM, METHOD FOR CONTROLLING A ROLL-FED PRINTING APPARATUS, AND METHOD FOR CONTROLLING THE RASTER IMAGE PROCESSOR
Aroll-fed printing apparatus, a raster image processor, a software medium,and a method of controlling a roll-fed printing apparatus. The roll-fed printing apparatus comprisesa print engineand a controller. The controller comprises a roll managing systemfor managing the printing of ripped images on at least one recording medium. Themethod comprisesthe steps ofthe controller receiving a plurality of ripped images from a raster image processor in memory of the roll managing system irrespectively of the presence of the least one recording medium in the roll-fed printing apparatus, for each ripped image the roll managing system establishing an arbitrary position in the plane of the at least one recording medium at which arbitrary position the ripped image is intended to be printed, the controller creating subsequent image swathes for printing the ripped imagesaccording to the established arbitrary positions of the ripped images, the print engine subsequently printing the created subsequent image swathes, while printing the created subsequent image swathes, the roll managing system monitoring a first actual status of printing of the created subsequent image swathes, a second actual status of a timing of the ripped images to be printed and a third actual status of the at least one receiving medium; andthe roll managing system displaying and keeping up- to-date a dynamic roll preview area representing the at least one recording medium, planned ripped images to be printed on the at least one recording medium, ripped images currently being printed on the at least one recording medium and image items representing the monitored first, second and third actual statuses.
A method for manufacturing an inkjet print head comprises the steps of determining a misfit strain - electric field crystal phase relation for at least one composition of a piezoelectric material; selecting a misfit strain value and a composition of the piezoelectric material based on the determined misfit strain - electric field crystal phase relation for said composition; and based on the selected misfit strain and the composition of the piezoelectric material, forming a base layer and an actuator stack on the base layer, the actuator stack comprising the piezoelectric material, wherein the base layer and the actuator stack have predetermined properties providing the selected misfit strain and composition. Thus, an inkjet print head having a piezoelectric actuator that is operated on the basis of a crystal phase change is reliably manufacturable.
The present invention relates to a printing system (1) for cut sheets. The printing system (1) comprises a paper path comprising a loop (32, 33, 34, 35) in order to enable duplex printing on the sheets in a continuous flow of sheets in a first and second interweaving pass in the loop (32, 33, 34, 35). A controller (37) controls simplex and/or duplex printing of image data on the continuous flow of sheets. A print engine is positioned in the loop (32, 33, 34, 35) configured to dispose marking material on the sheets according to the image data. A scheduler (373) time schedules the continuous flow of sheets in an order of a plurality of actions comprising loading a sheet, printing the sheet in a first pass in the loop (32, 33, 34, 35), printing the sheet in a second pass in the loop (32, 33, 34, 35), and unloading the sheet. The scheduler (373) is configured to use a digital representation of a directed graph of vertices and edges, each vertex representing an action of the plurality of actions on a sheet of the continuous flow of sheets and each edge representing an amount of time needed for a sheet to go from a starting vertex of the edge to an ending vertex of the edge. The directed graph also represents interweaving of sheets from a first pass and a second pass. The scheduler (373) comprises a digital window mover for providing subsequent windows over the directed graph. Each window of the subsequent windows covers a finite subset of the vertices of the directed graph which correspond to actions on a number of subsequently sheets to be processed in the continuous flow of sheets, as to allow repetitive executions of an algorithm for finding a shortest path between vertices covered by the window. A window size determines for each window of the subsequent windows the amount of vertices in the window and a window step size determines which vertices are covered by the subsequent windows respectively.
B41J 3/60 - Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed for printing on both faces of the printing material
B41J 13/00 - Devices or arrangements specially adapted for supporting or handling copy material in short lengths, e.g. sheets
13.
PRINTING SYSTEM AND METHOD FOR PRINTING AN IMAGE ON A PRINTED MEDIA PIECE WITHOUT USING REGISTRATION MARKS
The invention relates to a printing system and a method for printing images on a printed media piece (9, 91, 92, 93) by means of a printing system (100, 200). The printed media piece (9, 91, 92, 93) comprises printed images (33, 34, 39, 41, 42, 43) other than registration marks at predetermined positions. The printing system comprises a camera (10) directed towards the printed images on the printed media piece (9, 91, 92, 93) and connected to a controller (13, 8A) of the printing system (100, 200), and a print engine (18) for disposing marking material on the printed media piece (9, 91, 92, 93) in order to form images on the printed media piece (9, 91, 92, 93). The method comprising the steps of selecting a reference image (R1-R5) to be checked for presence at an arbitrary position in the printed images (33, 34, 39, 41, 42, 43) on the printed media piece(9, 91, 92, 93), selecting an instruction(613) for the addition of an additional image (A1-A5) to the reference image(R1-R5) on the printed media piece,transferring at least one digital image captured by the camera (10) from the printed media piece (9, 91, 92, 93) to the controller (13, 8A),recognizing and localizing the reference image at the arbitrary position in the printed images on the printed media piece(9, 91, 92, 93) on the basis of the at least one digital image captured by the camera (10)from the printed media piece (9, 91, 92, 93),deriving from a location of the localized reference image (R1-R5) on the printed media piece(9, 91, 92, 93) and from the instruction (613) a location of a target area on the printed media piece(9, 91, 92, 93) for printing the additional image(A1-A5), scheduling the additional image (A1-A5) for printing on the printed media piece (9, 91, 92,93) in the target area on the printed media piece (9, 91, 92, 93), and activating the print engine (18) to print the scheduled additional image (A1-A5) in the target area on the printed media piece (9, 91, 92, 93).
H04N 1/00 - PICTORIAL COMMUNICATION, e.g. TELEVISION - Details thereof
B41J 3/28 - Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed for printing downwardly on flat surfaces, e.g. of books, drawings, boxes
B41J 11/00 - Devices or arrangements for supporting or handling copy material in sheet or web form
G06K 15/02 - Arrangements for producing a permanent visual presentation of the output data using printers
An apparatus (20) for defect (D) detection in a printing system comprises an emitter (23) for emitting a signal towards a medium (S). A sensor assembly (25) is arranged for receiving at least part of the first emission signal reflected (R) from the medium. The apparatus is arranged for identifying a deformation in the medium from the received part of the first emission signal, and for determining a medium as suitable for printing when the first emission signal is substantially prevented from reaching the sensor assembly. A medium is determined to be suitable for printing when no signal reaches the sensor assembly. When the received signal exceeds a predefined reference, the apparatus determines a sheet to be unsuitable for printing. This configuration requires no strict alignment between the emitter and the sensor assembly, and is accurate despite vibrations and the like in the printing system.
The invention relates to a printing system (100)and a method for printing a plurality of images (190) on a first web (181) and on a second web(182), the printing system (100) comprising a print head (110), a feed unit (120) for feeding both the first web (181) and the second web (182) simultaneously to the print head (110) in a feed direction (Y) relative said print head (110), a wrap up unit (125) for wrapping up both the first web (181) and the second web (182) simultaneously to form a first output roll (183) and a second output roll (184) respectively, a user interface (130) configured to set a printing arrangement (250, 350) of the plurality of images (190) on the first web (181) and the second web (182) and to input the print head (110), the feed unit (120) and the wrap up unit (125) for performing printing according to the printing arrangement (250) by ejecting marking material on the respective webs. The printing system further comprises a prediction module (140) for predicting a first diameter of the first output roll (185) and a second diameter of the second output roll (186) based on the printing arrangement (250, 350)). The prediction module (140) is configured to establish a difference of the predicted first diameter and the predicted second diameter, and to provide to the user interface a warning when the established difference is larger than a predetermined diameter difference threshold.
A vacuum table for a wide format printing system, wherein a medium support surface with vacuum holes therein is spaced apart from a bottom plate by a spacer array. The spacer array is formed by an integrally formed spacer structure with a first and a second longitudinal plate positioned between the bottom plate and the medium support surface. These plates comprise a plurality of air flow through-holes as well as a top support edge and a bottom support edge extending equidistantly to one another. A connection element connects the first longitudinal plates and is positioned between the bottom support plane and the top support plane.The use of longitudinal plates allows the spacer to be cheaply and easily produced by punching. The plates further offer the advantage of a low air flow resistance while maintaining a high rigidity of the spacer array.
In a method for controlling a property of a liquid droplet generated in an inkjet print head, the method includes determining a target viscosity range;determining a liquid viscosity of a liquid arranged in the inkjet print head;maintaining a temperature of the liquid arranged in the inkjet print head constant, if the liquid viscosity is within the target viscosity range;adjusting a temperature of the liquid arranged in the inkjet print head to adjust the liquid viscosity in order to bring the liquid viscosity within the target viscosity range, if the liquid viscosity in step b is not within the target viscosity range.
B41J 2/045 - Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
A method of managing jobs in a workflow, wherein job specifications of jobs to be processed are stored on a digital management server (12), and a list (20) of jobs waiting for being processed and options for selecting a job from the list and editing or processing the job are presented to a user on a user interface (14), characterized in that the following steps are performed when a job (24) selected from the list (20) requires an editing operation that the user refuses to perform: the user designating, on the user interface (14), a second instance (18) for performing the required editing operation, which results in a message being sent from the job management server (12) to that instance (18); the job management server (12) marking the job (24) as locked, which, while the job remains in the list (20), prevents at least one processing operation from being performed on the job; - the job management server (12) providing the second instance (18) access to the job specifications of the selected job (24) for editing the same; and when it is confirmed that the editing operation has been accomplished, the job management server (12) unlocking the job (24).
A method is provided for forming an image (22) on a recording medium (14) in a printer (10), the printer (10) comprising a print head assembly for applying a curable ink on a recording medium (14) to form the image (22), a transport path arranged for moving the recording medium (14) in a transport direction (x) along the print head assembly and a curing system (20); said curing system (20) comprising a curing source, which curing source is arranged extending over the transport path in the transverse direction (y); the method comprising the steps of: moving the recording medium (14) through the transport path in a step-wise movement in the transport direction (x) along the print head assembly and the curing system (20); applying the curable ink on the recording medium (14) by the print head assembly to form the image (22); and curing the curable ink, which is applied on the recording medium (14), by the curing source in a curing zone (26) on the recording medium (14), the curing zone (26) extending over the transport path in a transverse direction (y), the transverse direction (y) being substantially perpendicular to the transport direction (x); wherein the curing step comprises moving the curing zone (26) along the transport direction (x) through the transport path in response to the step-wise movement of the recording medium (14).
A printing system for printing a plurality of images (190) in a first web (181) and in a second web (182), the printing system comprising: a) a print head; b) feed means for feeding both the first web (181) and the second web (182) simultaneously to the print head in a feed direction (Y) relative said print head; c) a user interface configured to set a printing arrangement of the plurality of images (190) in the first web (181) and the second web (182) and to input the print head and the feed means for performing printing according to the printing arrangement; wherein the printing system further comprises a print-pause module for stopping printing of the printing arrangement, the print-pause module being configured to: - provide to the user interface a print-pause arrangement (361) in which a print-pause (362) is arranged in the printing arrangement upstream the feed direction (Y) with respect to both the print head and a first image (C) whose printing is being performed in the first web (181) when the print-pause module is selected; and - cooperate with the user interface to input the print head and the feed means according to the print-pause arrangement (361) to stop printing once printing of said first image (C) is complete.
The invention relates to a computer implemented method of job programming comprising the steps of • using a processor to assemble a printable file based on more than two reference pages of an input file and a plurality of print instructions; • including printer readable instructions in the printable file to print more than one copy of a reference page of the more than two reference pages. The method further comprises • grouping a first set of reference pages of the input file into a first group based on a first plurality of print instructions; • using a processor to assemble a first part of the printable file based on the first group and the first plurality of print instructions; • grouping a second set of reference pages of the input file into a second group based on a second plurality of print instructions; • using a processor to assemble a second part of the printable file based on the second group and the second plurality of print instructions; • including printer readable instructions in the printable file to direct printed pages corresponding to the printer readable instructions to print more than one copy of the reference page to a common stack, to direct printed pages corresponding to the first part of the printable file to the common stack and to direct printed pages corresponding the second part of the printable file to the common stack.
Reprographic controller for providing reprographic commands to a reprographic engine, the reprographic controller having a reprographic setting, the reprographic controller comprising: a communication device for communicating with a computing device running a device driver; and user interface screen generation means connected to the communication device, the user interface screen generation means arranged to generate and return a user interface screen comprising a user interface widget for setting the reprographic setting upon receiving a user interface screen request through the communication device from the device driver; the reprographic controller further arranged to: receive from the device driver through the communication device: a value for the reprographic setting; and a reprographic job; and the reprographic controller further comprising: a job processing device for processing the reprographic job taking into account the received value for the reprographic setting.
A method is provided for cancelling an electric crosstalk contribution in a monitoring signal from a monitored electro-mechanical transducer in a device comprising at least three electro-mechanical transducers. The crosstalk contribution results from an actuation of other transducers than the monitored transducer. The method comprises the steps of: (a) selecting a second transducer, associated with the first, monitored transducer, wherein the electric crosstalk caused by an actuation of a third transducer is equal in the first and second transducer; (b) actuating the first transducer and not acutating the second transducer; (c) simultaneously measuring a monitoring signal from the first transducer and the second transducer; (d) subtracting the two monitoring signals to obtain a clean monitoring signal from the first transducer.
B41J 2/045 - Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
An ink jet printer comprising: - a number of print heads (10) each of which has a first port (12) and a second port (16), - an ink supply unit (20), - a drain line (22), - a first manifold (14) connecting the ink supply unit (20) to the first port (12) of each print head (10), and - a second manifold (18) connected to the second port (16) of each print head (10) and connectable to the drain line (22), characterized by a valve system (24, 26) arranged to disconnect the second manifold (18) from the drain line (22) and to connect it to the ink supply unit (20).
The present invention relates to a printing system and method for improving ink absorption in the print substrate by preventing evaporation. The printing system comprises a conditioned transport module (10) arranged for transporting a printed print substrate (2) from a (conditioned) image formation module (1) to a drying/fixation module (20).
In a method for detecting a disturbance in an ejection unit of an inkjet print head, the ejection unit of the inkjet print head comprises a pressure chamber for holding an amount of liquid and being in fluid communication with a nozzle orifice; and an actuator operatively coupled to the pressure chamber for generating a pressure wave in the liquid in the pressure chamber for ejecting a droplet of the liquid through the nozzle orifice upon application of a droplet ejection pulse. The method comprises the steps of determining at least one resonance frequency of the pressure chamber; determining a disturbance detection pulse for generating a pressure wave in the liquid in the pressure chamber taking into account the resonance frequencies previously determined, wherein the disturbance detection pulse has a frequency spectrum different from a frequency spectrum of the droplet ejection pulse; detecting a residual pressure wave in the liquid in the pressure chamber; and analyzing the residual pressure wave previously detected for determining whether a disturbance for droplet ejection is present in the ejection unit. With this method, disturbances in the ejection unit may be derived from the residual pressure wave more reliably and easier.
B41J 2/045 - Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
The present invention relates to a radiation curable ink composition comprising a gellant. The present invention further relates to an ink set comprising such ink composition. The present invention further relates to a method for making such ink composition and a printing method using such ink composition.
C09D 11/101 - Inks specially adapted for printing processes involving curing by wave energy or particle radiation, e.g. with UV-curing following the printing
C09D 11/12 - Printing inks based on waxes or bitumen
The present invention relates to a substantially water-free pre-treatment composition comprising an acid anhydride in an organic matrix. The invention further relates to a kit of parts comprising said pre-treatment composition and an ink composition that has an intrinsic inferior water fastness when printed, where the ink comprises a compound that is soluble in alkaline environment (ink as such) and insoluble in a neutral and/or acidic environment. The invention also relates to a printing method for improving the water fastness of a print made with an ink that has intrinsically low water fastness, by using a pre-treatment composition according the present invention.
B41M 5/00 - Duplicating or marking methods; Sheet materials for use therein
C09D 11/54 - Inks based on two liquids, one liquid being the ink, the other liquid being a reaction solution, a fixer or a treatment solution for the ink
29.
DUPLEX PRINTING SYSTEM FOR CUT SHEETS, A METHOD AND SOFTWARE PRODUCT THEREFOR
The invention relates to a printing system (1) for cut sheets. The printing system (1) comprises a control unit (37) for controlling the printing of image data on a plurality of sheets and scheduling the plurality of sheets in a printing order, a paper path comprising a duplex printing loop and a rotational functional component (30) arranged in the duplex printing loop for guiding and processing a printed sheet for two passes along or on a surface of the rotational functional component (30), a print engine arranged in the duplex printing loop and configured to dispose marking material on the sheets according to the image data, in two passes, one side per pass. The control unit (37) is configured to schedule one-sided printed sheets for a first pass guided along or on the surface of the rotational functional component (30) and two-sided printed sheets for a second pass guided along or on the surface of the rotational functional component (30) by using the duplex printing loop and to determine a distance between subsequent sheets guided along or on the surface of the rotational functional component (30) such that a location on the surface of the rotational functional component (30) is covered by printed sides of two-sided sheets at most a maximum number of times before the location on the surface of the rotational functional component (30) is covered by an unprinted side of a sheet. The maximum number is determined by a degree of pollution caused by the marking material printed on two-sided printed sheets when taking a second pass along or on the surface of the rotational functional component (30).
B41J 11/00 - Devices or arrangements for supporting or handling copy material in sheet or web form
B41J 3/60 - Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed for printing on both faces of the printing material
B41J 13/00 - Devices or arrangements specially adapted for supporting or handling copy material in short lengths, e.g. sheets
G03G 13/23 - Processes involving the combination of more than one step according to groups specially adapted for copying both sides of an original or for copying on both sides of a recording or image-receiving material
G03G 15/20 - Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat
G03G 15/23 - Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups specially adapted for copying both sides of an original or for copying on both sides of a recording or image-receiving material
B41F 23/04 - Devices for treating the surfaces of sheets, webs or other articles in connection with printing by heat drying, by cooling, by applying powders
30.
FLUID JETTING DEVICE, PRINTING APPARATUS, AND METHOD THEREFOR
Fluid jetting device comprising: a nozzle plate, a fluid chamber terminating in an orifice in the nozzle plate, an actuator for generating a pressure wave in a fluid in the fluid chamber to jet fluid through the orifice from the chamber, a jetting waveform generating device connected to the actuator for generating an excitation waveform comprising two separated pulses, called a jetting pulse and a quenching pulse, for respectively generating a pressure wave in the fluid in the fluid chamber leading to a fluid droplet and for substantially cancelling a pressure wave in the fluid in the fluid chamber, wherein the jetting waveform generating device is adapted to make two consecutive excitation waveforms at least partially overlap for jetting two consecutive fluid droplets.
B41J 2/045 - Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
The present invention provides an ink supply system (1) for supplying ink to a drop-forming unit (2) of a print-head (100) in a printing system, comprising: a housing (3) enclosing a reservoir (4) which holds a volume of ink (5) to be supplied to a drop-forming unit (2) in a print-head (30); an inlet (6) for admitting ink into the reservoir (4); and an outlet (7) for discharging the ink from the reservoir (4) to supply the drop-forming unit (2); wherein the system (1) is configured to regulate a level of the ink (5) in the reservoir (4) such that a free space (8) remains above the ink (5) held in the reservoir (4), and wherein the reservoir (4) comprises flow channel (9) configured to guide the ink (5) along a predetermined horizontal path (10) through or around the reservoir (4) from the inlet (6) to the outlet (7).. Furthermore, the invention provides a print-head (30) in a printing system, comprising such an ink supply system (1) and a drop-forming unit (2) which is supplied with ink from the outlet (7) of the ink supply system (1).The invention further provides a printing system that includes such an ink supply system (1) and/or such a print-head (30).
The present invention relates to an ink supply system (1) for supplying ink to a drop-forming unit (40) of a print-head (50) in a printing apparatus. The ink supply system (1) comprises: a reservoir (2) for holding or storing a volume of liquid ink to be supplied to a drop-forming unit (40) in a print-head (50), and a heating device (10) arranged upstream of the reservoir (2) for heating the ink to an desired operating temperature. The heating device (10) comprises a heating body (11) for transferring heat to the ink, wherein the heating body (11) comprises a plurality of channels (12) which extend from an topside (13) of the heating body (11) to an bottom side (14) of the heating body (11) for conveying the ink to the reservoir (2), whereby the ink is heated via contact with walls of the channels (12). The heating body (11) typically comprises a substantially monolithic body of a highly thermally conductive material and the plurality of channels (12) are substantially parallel channels which extend through the heating body (11). The invention also relates to a print-head (50) of a printing apparatus incorporating the ink supply system (1), and to the heating device (10).
patents
