EP3148809A1 - Multi-format printer - Google Patents
Multi-format printerInfo
- Publication number
- EP3148809A1 EP3148809A1 EP15727915.9A EP15727915A EP3148809A1 EP 3148809 A1 EP3148809 A1 EP 3148809A1 EP 15727915 A EP15727915 A EP 15727915A EP 3148809 A1 EP3148809 A1 EP 3148809A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- format
- print head
- maintenance
- instructions
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000012423 maintenance Methods 0.000 claims abstract description 104
- 238000000034 method Methods 0.000 claims description 12
- 238000004458 analytical method Methods 0.000 claims description 3
- 238000010926 purge Methods 0.000 description 9
- 238000004140 cleaning Methods 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000003213 activating effect Effects 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/135—Nozzles
- B41J2/165—Prevention or detection of nozzle clogging, e.g. cleaning, capping or moistening for nozzles
- B41J2/16585—Prevention or detection of nozzle clogging, e.g. cleaning, capping or moistening for nozzles for paper-width or non-reciprocating print heads
- B41J2/16588—Print heads movable towards the cleaning unit
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J11/00—Devices or arrangementsĀ of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form
- B41J11/0025—Handling copy materials differing in width
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/135—Nozzles
- B41J2/165—Prevention or detection of nozzle clogging, e.g. cleaning, capping or moistening for nozzles
- B41J2/16517—Cleaning of print head nozzles
- B41J2002/1657—Cleaning of only nozzles or print head parts being selected
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/135—Nozzles
- B41J2/165—Prevention or detection of nozzle clogging, e.g. cleaning, capping or moistening for nozzles
- B41J2/16585—Prevention or detection of nozzle clogging, e.g. cleaning, capping or moistening for nozzles for paper-width or non-reciprocating print heads
- B41J2002/16591—Prevention or detection of nozzle clogging, e.g. cleaning, capping or moistening for nozzles for paper-width or non-reciprocating print heads for line print heads above an endless belt
Definitions
- a print head disposed at the conveyer and having an array of dot printing elements, the array extending in a direction Z normal to the conveying direction, the print head being arranged to print images onto the media sheets in accordance with actuation instructions sent to the print head;
- controller adapted to convert print instructions that specify images to be printed onto the media sheets into the actuation instructions for the print head
- the conveyer is arranged to convey sheets with different formats which differ in their dimension in the direction Z
- the maintenance manager is adapted to decide on the maintenance operation, whenever the format of the sheets to be conveyed to the print head changes from a narrower format to a wider format with a dimension in Z direction larger than that of the narrower format, on the basis of actuation instructions for printing elements located within the width range of the wider format but outside of the width range of the narrower format.
- Printers of this type are disclosed in US 2007/132799 A1 and US 2009/122106 A1 .
- US 7 036 897 B2 discloses a printer, more specifically an ink jet printer in which the printing elements are formed by nozzles and actuators associated therewith for expelling ink droplets from the nozzles.
- the nozzles are not active, the ink in the nozzle orifices starts to dry out, so that the nozzle orifice is contaminated and eventually clogged with dried ink, which disturbs the drop generation process and may eventually lead to a complete failure of the nozzle.
- a maintenance operation is performed at the start of a new print job.
- the maintenance operation consists in activating the nozzle for several hundreds of times so as to purge the nozzle orifice with liquid ink, thereby to remove any contaminants and to clear the nozzle orifice.
- this maintenance operation would be performed for all the nozzles of the print head, a considerable amount of ink would be wasted for the maintenance operation. For this reason, it is proposed in the cited document to perform the maintenance operation only for those nozzles that will actually be needed for printing in the print job.
- printers especially ink jet printers which are capable of processing print media sheets in different formats in random succession.
- the print head As long as the format of the sheets does not change, it is possible to control the print head such that all nozzles that are located within the width range of the sheets are activated so frequently that the time in which an individual nozzle has been idle, the so-called nozzle open time, is kept below a certain limit which, when exceeded, would necessitate a maintenance operation.
- the print process may involve nozzles that have not been actuated for a considerable time period, larger than the admissible nozzle open time, because these nozzles were located outside of the width range of the sheets that have been processed previously, so that the droplets ejected by these nozzles would not have hit the recording medium but would have stained the conveyer. It has therefore been common practice to perform a maintenance operation each time when such a format change occurs.
- the maintenance operation is performed for the entire print head which, to this end, is lifted off from the conveyer and moved aside into a maintenance station where the maintenance operations are performed.
- the entire print head which, to this end, is lifted off from the conveyer and moved aside into a maintenance station where the maintenance operations are performed.
- maintenance operations may comprise purging the nozzles and wiping the surface in which the nozzle orifices are formed. It is an object of the invention to provide a multi-format printer which permits a higher productivity.
- the invention provides a printer of the type indicated above, wherein the maintenance manager is adapted to decide on a maintenance operation on the basis of whether or not the actuation instructions for the dot printing elements located outside of the width range of the narrow format but inside the width range of the wider format specify that at least one of these dot printing elements is needed for printing a part of the image.
- the invention is based on the consideration that, when the format of the sheets changes from a narrower format to a wider format, this does not necessarily mean that a maintenance operation is actually needed. For example, there may be cases in which the nozzles that are located outside of the width range of the narrower format that has been processed previously are not needed for printing an image on the sheets of the wider format, neither. For this reason, the invention involves an analysis of the actuation instructions for the printing elements, which permits to decide whether the nozzles located outside of the width range of the previous format will actually be needed.
- the maintenance operations may include different types of operations which differ in their cleaning efficiency, and the maintenance manager may decide on the basis of the nozzle open times not only whether a maintenance operation is to be performed at all, but also which of the available maintenance operations shall be performed.
- Fig. 1 is a block diagram of a printer according to the invention.
- the printer shown in Fig. 1 comprises a conveyer 10 arranged to convey print media sheets 1 - 9 one after another in a conveying direction X, and a print head 12 disposed at the conveyer 10 and having an array 14 of dot printing elements, the array extending in a direction Z normal to the conveying direction.
- the print head is arranged to print images 16, 18 onto the media sheets 1 - 9 in accordance with actuation instructions 20 sent to the print head.
- the printer further includes an electronic controller 22 which controls the overall operation of the printer.
- the controller 22 receives print instructions 24 from a print job file that is transmitted to the controller 22 via a network or has been temporarily stored on a storage medium that is connected to the controller 22.
- the controller 22 On the basis of the print instructions 24, the controller 22 generates the actuation instructions 20 for the print head 12.
- the print instructions 24 may further include format instructions specifying a format of the sheets 1 - 9 on which the pages of the print job shall be printed.
- a feeder 26 is disposed at an upstream end of the conveyer 10 and arranged to receive instructions from the controller 22 so as to withdraw cut sheets with the required format from one of a plurality of bins (not shown) and to feed these sheets in the desired sequence to the conveyer 10.
- the print instructions 24 may further comprise instructions specifying whether the images 16, 18 are to be printed only on one side of each sheet (simplex printing) or on both sides (duplex printing).
- duplex printing the sheets with a first image printed on one side thereof are re-circulated via a duplex loop 28 back to the feeder 26, and they are fed to the conveyer 10 in reverse orientation, so that another image will then be printed on the second side of the sheet.
- the print head 12 is disposed above the conveyer 10 in a position in which the array 14 of printing elements extends over the entire width of the conveyer 10.
- the printer is an ink jet printer
- the printing elements are constituted by nozzles from which ink droplets are expelled onto the media sheets 1 - 9 in accordance with the actuation instructions 20.
- each nozzle is associated with an actuator, e.g. a piezoelectric actuator that generates a pressure wave in the liquid ink, such that the pressure wave may propagate to the nozzle to cause a droplet to be formed and expelled.
- an actuator e.g. a piezoelectric actuator that generates a pressure wave in the liquid ink, such that the pressure wave may propagate to the nozzle to cause a droplet to be formed and expelled.
- the maintenance operation may further include a wiping step in which a surface of the print head 12 that includes the nozzle orifices is wiped, e.g. with a wet sheet, so as to remove any remnants of dried ink.
- the manipulator 30 moves the print head 12 back to the operative position shown in Fig. 1.
- the maintenance station 32 and the manipulator 30 are controlled by a maintenance manager 34 which is capable of analysing the print instructions 24 as well as the actuation instructions 20 being generating in the controller.
- the controller 22 - including the maintenance manager 34 - is arranged to schedule all operations of the printer in advance for a certain number of pages, e.g. 200 pages to be printed in accordance with the print instructions 24.
- a maintenance operation with a relative low open time limit is a so-called pre-fire operation which can be performed by the print head 12 itself without using the maintenance station 32.
- the actuators for the pertinent nozzles of the print head are energized to cause vibrations in the liquid ink in the nozzle orifice with an amplitude that is not sufficient for expelling an ink droplet.
- these vibrations will help to remove or dissolve possible contaminations in the form of dried ink in the nozzle orifice, especially, when the ink is just about to dry out and has not yet dried completely.
- the spitting instructions are generated in the controller 22 on the basis of the monitored nozzle open times and can be considered as a specific type of actuation instructions. Thanks to the spitting mechanism described above, it can be taken for granted that none of the nozzles that are located within the width range of the sheets to be printed will exceed an open time limit as long as the format of the sheets is not changed.
- the sheet format changes from a narrow format with a width range w1 , such as that of the sheets 2, 4, 5, 7 and 8 in Fig. 1 , to a wider format with a width range w2, such as that of the sheets 1 , 3, 6 and 9 in Fig. 1
- a wider format with a width range w2 such as that of the sheets 1 , 3, 6 and 9 in Fig. 1
- the maintenance monitor 34 checks whether or not a maintenance operation is necessary and, if yes, which maintenance operation should be performed. The decision is taken on the basis of the actuation instructions 20, including the spitting instructions, for the pertinent nozzles. Among others, the maintenance manager 34 will derive from the actuation instructions, at least for those nozzles that will be required for printing the next sheet, the nozzle open times that will have elapsed when the nozzle is actuated for printing on the next wide format sheet as scheduled.
- Fig. 2 is a flow diagram illustrating the operations that the maintenance manager 34 will perform for each sheet that is being scheduled for printing.
- step S1 it is decided whether the sheet (sheet n) that is being scheduled for printing has a width, i.e. a dimension in the direction Z, which is smaller than or equal to the width of the last sheet (n-1 ) that has been scheduled before. If that condition is fulfilled (Y), then the sheet n is scheduled for printing in step S2, which means that no maintenance operation shall be performed immediately before that sheet n reaches the print head 12.
- a nozzle may be scheduled for spitting as soon as the leading edge of a sheet has reached the X position of the nozzle.
- the maintenance manager 34 checks for each of the nozzles which have not been used for sheet n-1 , whether the nozzle open time is larger than a first limit T1 that is associated with the purge and wipe maintenance operation to be performed in the maintenance station 32.
- step S5 this maintenance operation is performed in step S5. This means that the print production process has to be interrupted for the duration of the maintenance operation.
- sheet n is planned in step S8.
- step S6 it is checked in step S6 whether the nozzle open time for at least one of the nozzles that will be needed for the sheet N exceeds a lower second limit T2. If that is the case (Y), the maintenance manager schedules, in step S7, a pre-fire maintenance operation which is less efficient than the purge and wipe maintenance operation performed in step S5 but is sufficient if the nozzle open time was not too long.
- the pre-fire maintenance operation has the advantage that it may be performed with the print head 12 remaining "in-situ", i.e. in the operative position shown in Fig. 1. In continuation from step S7 the sheet is planned in step S8.
- step S6 If it is found in step S6 that the nozzle open time for the nozzles in consideration does not even exceed the lower limit T2 (N), then the sheet n is scheduled for printing without any maintenance operation at all, so that even the less time-consuming maintenance operation in step S7 can be spared.
- step S6 is left out from the method and from step S4 (N) the method continues with step S7.
- this sheet 3 reaches the print head 12, the format changes from the narrow format of the sheet 2 to the wide-format of the sheet 3 and,
- the maintenance manager 34 decides on a maintenance operation.
- the maintenance manager my find in step S6 that the nozzle open times for the nozzles, even in the above-mentioned image parts near the edges of sheet 3, exceed only the smaller limit T2 but not the larger limit T1. Consequently, the maintenance manager will decide to perform a pre-fire maintenance operation before printing the sheet 3.
- the nozzles near the left and right ends of the array 14 are idle again. This time, the nozzle open time exceeds the larger limit T1 because the number of narrow format sheets to be printed was larger.
- the nozzle open time will again exceed the higher limit T1 , and then a decision on a maintenance operation has to be made for the next wide format sheet 9.
- the image 16 to be printed on the sheet 9 overlaps the margin areas 36, so that nozzles will be needed for which the limit T1 has been exceeded. Consequently, the maintenance manager 34 will in this case decide in step S4 that the time-consuming purge and wipe maintenance operation in the maintenance station 32 cannot be avoided.
- the sheets 1 - 9 shown in Fig. 1 are to be printed in the duplex mode, the sheets will be re-circulated through the duplex loop 28 and back to the feeder 26.
- the time required for re-circulating the sheets through the duplex loop is larger than the time needed for printing the sheets 1 - 9 on the first side, there may be a time gap in the printing sequence, and this gap will add to the nozzle open times that are checked in step S3.
- the nozzle open time should be checked for all the nozzles of the print head including those within the width range w1 of the narrow format, because there is actually no sheet that immediately precedes the sheet to be scheduled (no sheet n-1 ), and consequently no nozzles have been used at all.
- the purge and wipe maintenance operation in step S5 may of course be scheduled for a time so early that the time gap in the print sequence may be utilized for performing at least a part of the maintenance operation, thereby to enhance productivity.
Landscapes
- Ink Jet (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP14170197 | 2014-05-28 | ||
PCT/EP2015/061693 WO2015181228A1 (en) | 2014-05-28 | 2015-05-27 | Multi-format printer |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3148809A1 true EP3148809A1 (en) | 2017-04-05 |
EP3148809B1 EP3148809B1 (en) | 2020-11-18 |
Family
ID=50979522
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP15727915.9A Active EP3148809B1 (en) | 2014-05-28 | 2015-05-27 | Multi-format printer |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP3148809B1 (en) |
WO (1) | WO2015181228A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102019104931A1 (en) * | 2019-02-27 | 2020-08-27 | Canon Production Printing Holding B.V. | Method and device for controlling an actuator of an inkjet printing system |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2005349660A (en) * | 2004-06-09 | 2005-12-22 | Canon Inc | Recorder and method of recording |
JP2007152885A (en) * | 2005-12-08 | 2007-06-21 | Fujifilm Corp | Image recorder |
US8087746B2 (en) * | 2007-11-09 | 2012-01-03 | Hewlett-Packard Development Company, L.P. | Movable fluid receiver |
JP5050939B2 (en) * | 2008-03-10 | 2012-10-17 | ć»ć¤ć³ć¼ćØćć½ć³ę Ŗå¼ä¼ē¤¾ | Liquid ejecting apparatus and flushing method |
-
2015
- 2015-05-27 WO PCT/EP2015/061693 patent/WO2015181228A1/en active Application Filing
- 2015-05-27 EP EP15727915.9A patent/EP3148809B1/en active Active
Also Published As
Publication number | Publication date |
---|---|
EP3148809B1 (en) | 2020-11-18 |
WO2015181228A1 (en) | 2015-12-03 |
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