EP3765299A1 - VERSCHLEIßKOMPENSATIONSVORRICHTUNG EINES ETIKETTENDRUCKERS - Google Patents
VERSCHLEIßKOMPENSATIONSVORRICHTUNG EINES ETIKETTENDRUCKERSInfo
- Publication number
- EP3765299A1 EP3765299A1 EP19708068.2A EP19708068A EP3765299A1 EP 3765299 A1 EP3765299 A1 EP 3765299A1 EP 19708068 A EP19708068 A EP 19708068A EP 3765299 A1 EP3765299 A1 EP 3765299A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- electrical resistance
- thermal
- heating resistor
- control device
- threshold value
- 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
- 238000010438 heat treatment Methods 0.000 claims abstract description 96
- 238000007639 printing Methods 0.000 claims abstract description 26
- 238000007651 thermal printing Methods 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims description 15
- 230000008569 process Effects 0.000 claims description 6
- 230000008859 change Effects 0.000 description 9
- 230000009471 action Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 230000032683 aging Effects 0.000 description 4
- 230000006866 deterioration Effects 0.000 description 3
- 238000000859 sublimation Methods 0.000 description 3
- 230000008022 sublimation Effects 0.000 description 3
- 238000010023 transfer printing Methods 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000000151 deposition Methods 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 239000003086 colorant Substances 0.000 description 1
- 230000001447 compensatory effect Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010017 direct printing Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000003756 stirring 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
- B41J2/315—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material
- B41J2/32—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material using thermal heads
-
- 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
- B41J2/315—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material
- B41J2/32—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material using thermal heads
- B41J2/35—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material using thermal heads providing current or voltage to the thermal head
- B41J2/355—Control circuits for heating-element selection
- B41J2/3553—Heater resistance determination
-
- 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
- B41J3/00—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed
- B41J3/407—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed for marking on special material
- B41J3/4075—Tape printers; Label printers
Definitions
- the present invention relates to a wear compensating device of a label printer according to the preamble of claim 1 and to a method for wear compensation of a label printer according to the preamble of claim 12.
- the labels in particular product labels, are either self-adhesive labels detachably arranged on a carrier strip or linerless labels which are provided as a continuous strand and are separated by cutting.
- the individual labels or the endless strand are then fed to a printhead which imprints the labels comprising, for example, price and / or weight information about a product.
- the printed labels are then subsequently removed from the print head and applied to an object, in particular a product.
- the printhead of such a label printer can be designed in different ways. In addition to an inkjet or laser print head, it can also be designed as a thermal print head, hereinafter referred to as a thermal head.
- Thermal printing refers to a technique in which a thermosensitive medium is changed in color, in particular blackened, by the action of heat at the site of the action of heat. The punctual effect of heat is caused by one or more rows of small heating resistors, which are arranged in the thermowell of the thermal head. Each heating resistor, also called Dot, can be individually controlled and heated.
- Thermal printing distinguishes direct thermal printing, thermal transfer printing and thermal sublimation printing. In direct thermal printing, a thermo-sensitive paper is immediately blackened by selective heat at the site of heat input.
- thermo transfer printing it is also known special paper for thermal direct printing, which produces different colors at the place of heat input at different levels of heat.
- the paper to be printed is not passed directly past the thermo strip, but the paper is passed along the thermal strip together with a special film (transfer film). leads, wherein the transfer film between the paper and the thermal bar is arranged. Due to the punctual effect of heat, the color layer on the transfer film melts in the region of the heat input and is absorbed by the adjacent paper. Also in the case of sublimation printing, a transfer film is placed between the paper to be printed and the thermal strip. Due to the punctual heat input, however, the color layer on the transfer film does not melt here, but instead the dye changes into the gaseous state and is absorbed by the adjacent paper.
- a well-known problem with thermal printing is that the heating resistors age over time. The aging process is accompanied by an increase in the electrical resistance of the heating resistor (s), which produces less heat (with the same current and / or voltage). The result is a deterioration of the print quality on the printed labels. It is therefore necessary, after a certain period of operation, for example, for an average increase in the electrical resistance of all heating resistors by 15% compared to the initial value, d. H. the value at initial startup of the thermal bar to replace the thermal bar. Such replacement causes undesirable downtime of the label printer and a corresponding labeler and leads to an increase in operating costs.
- the prior art (DE 10 2015 118 732 A1), which is based on the Applicant, discloses the pressure force to push the respective label against the thermal strip during printing to increase over time. In this way, the effect of the wear of the heating resistors can be counteracted to some extent.
- the thermal head and a counter-pressure element which presses from below in the direction of the thermal strip, are each mounted to be movable.
- the invention is based on the problem to provide a wear compensation device, the effects as simple as possible counteracts aging-related wear and associated deterioration of the print quality on printed labels.
- control device that controls the thermal head for printing the respective label is configured to monitor the electrical resistance of one or more of the heating resistors and when exceeding a predetermined threshold value for the electrical resistance of the energization of the respective heating resistor at a To increase printing.
- the respective heating resistor can deliver correspondingly more energy to the thermosensitive medium of the label to be printed, as a result of which a closure-related decrease in the color change caused by the respective heating resistor, in particular blackening, can be counteracted.
- the fundamental consideration is to compensate for age-related wear of the thermal strip or its effects by increasing the duration of the heating resistance of the respective heating resistor. So increases, at least from a certain point in time during the life of a thermal bar, due to age, the electrical resistance of the heating resistors, which is not enough heat energy is introduced into the thermosensitive medium at the standard energization.
- the thermosensitive medium can change in color correspondingly more strongly, in particular blackening.
- the stronger color change or blackening of the thermosensitive medium is based in particular not only on the extended exposure time, but also on a stronger heating of the heating resistor due to the longer energization.
- the respective heating resistor from the time of increasing the energization time is correspondingly more stressed and correspondingly faster aging.
- the impression quality can be longer on an accu- be kept at a reasonable level, whereby the Thermoieiste can be operated longer overall.
- the Thermoieiste can then be replaced at a later date than normally, which reduces the total cost of ownership.
- the resistance of all heating resistors of the thermoieiste is preferably monitored. But it is also conceivable to monitor only a part of the heating resistors.
- the electrical resistance of heating resistors of at least one predetermined group of heating resistors of the thermoieiste can be monitored.
- the group of heating resistors includes, for example, such heating resistors, which, because they are supplied with power by default, are particularly stressed and are particularly susceptible to wear.
- the voltage and / or the current intensity in the printing operation with the increased energization time is preferably not changed.
- a voltage and / or an increase in current intensity can also be provided as an additional compensation measure.
- the electrical resistance of the respective heating resistor is preferably determined continuously, d. H. every time you turn it on.
- a determination of the electrical resistance can also take place at intervals, in particular at regular time intervals or whenever a printing pause is pending. For example, this can be done regularly every thousandth power-on or once or several times a day.
- Claims 5 and 6 define particular embodiments of the control device.
- This can for example comprise a current and / or voltage measuring device for determining the respective electrical resistance (claim 5) and / or a comparator for comparing the respectively determined electrical resistance or resistance value with the predetermined threshold value (claim 6).
- the energization duration can then be set, ie, if the predetermined threshold value has not been exceeded, the energization duration does not become changed, or if the predetermined threshold has been exceeded, wind the energizing increased as described above
- the Bestromungsdauer is set in dependence on the respectively determined electrical resistance of the respective heating resistor, wherein the Bestromungsdauer increases linearly or exponentially, in particular with increasing electrical resistance.
- the extent to which the energization duration is increased with increasing electrical resistance can be determined in particular by means of stored characteristic curves or characteristic diagrams.
- the control device may have a memory.
- the control device has a memory in which the threshold value is stored, preferably for each monitored heating resistor a separate threshold or for all monitored heating resistors a common threshold or for at least one group of monitored heating resistors in each case a common threshold is stored (claim 8) ,
- the respective threshold remains constant or adjusted over time, in particular is raised. It can thus be provided that the control device initially carries out the monitoring on the basis of an initial value for the threshold value and retains the threshold value or takes it into account until it has been exceeded for the first time. By exceeding a new threshold is generated and stored in particular in the memory that replaces the previous threshold. The previous threshold is then overwritten. The current duration set on the basis of the exceeding of the previous threshold value is then maintained or not increased until the new threshold value has been exceeded for the first time.
- the controller may itself set a threshold for the electrical resistance of the respective heating resistor when a new thermal bar has been installed.
- the control device ie it autonomously recognizes the presence of a new thermal strip and then determines the threshold value (s) without the intervention of an operator. It is also conceivable semi-automatic determination of the thresholds, ie an operator starts after a new thermal bar is installed, a routine that then automatically passes through the controller to set the threshold (s).
- the threshold value in particular the initial value, according to the embodiment of claim 11, in particular 1 to 20%, preferably 1 to 10%, particularly preferably 1 to 5%, higher than the initial value for the electrical resistance of the respective heating resistor or as the average output value of all monitored heating resistors.
- the initial value refers to the resistance value at the first start-up of the thermal bar. It can therefore be set for each monitored heating resistor, a separate threshold or it can be set for several monitored heating resistors, a common threshold.
- the energization time is then preferably set individually for each monitored heating resistor.
- a method for wear compensation of a label printer which prints labels by means of thermal printing, for example by direct thermal printing, thermal transfer printing or thermal sublimation printing.
- Substantially in the method which, in particular using a ner as previously defined Verschl encompasskompensationsvorraum can be performed is that the electrical resistance of one or more of the heating resistors of a Thermoieiste a thermal head of the label printer is monitored and when exceeding a predetermined threshold value for the electrical resistance, the Bestromungsdauer the respective heating resistor is increased in a printing operation.
- Fig. 1 is a schematic view of a proposed Verschl combinkompensationsvorraum from the side and from the front.
- Threshold for the electrical resistance and b) after exceeding the threshold value for the electrical resistance.
- the wear compensation device 1 shown in the two views in FIG. 1 is part of a label printer 2 which prints labels 3 by means of thermal printing, for example by means of direct thermal printing.
- the labels 3 are here by way of example self-adhesive labels 3, which are arranged on a carrier strip (not shown) releasably and are printed individually after peeling.
- a thermal head 4 For printing a thermal head 4 is provided, which has a Thermoieiste 5 with a plurality of heating resistors (dots) 6, via which on the top of the respective label 3, which is passed past the Thermoieiste 5, a print image of a certain impression quality is generated.
- thermoieiste 5 opposite side ie here vertically below the label 3, which wind just printed, is a counter-pressure element. 7 arranged, which is here and preferably designed as a pressure felt coated strip.
- the counterpressure element 7 can also be a pressure control.
- a label supply device 8 here and preferably in the form of a conveyor belt, is provided, which supplies the respective label 3 to the effective region 9 of the heating resistors 6.
- the labels 3 after they have been isolated or detached from a carrier strip, fed to the area of action.
- the range of action is meant the section below the thermal strip 5, in which the heating resistors 6 can selectively introduce heat energy into the thermosensitive medium of the label 3 and thereby cause a color change, in particular a blackening, of the label 3 at this point.
- the proposed wear compensation device 1 further comprises a control device 10 which controls the thermal head 4 for printing the respective label 3.
- the control of the thermal head 4 comprises the energizing of the respective heating resistors 6 for a predetermined energization duration.
- the control device 10 monitors the electrical resistance R of one or more of the heating resistors 6, here all the heating resistors 6 of the thermal bar 5.
- the monitoring comprises the repeated determination of the electrical resistance R of the respective heating resistor 6.
- the control device 10 When exceeding a predetermined threshold value R 1 for the electrical resistance R, the control device 10 then increases the energization duration of the respective heating resistor 6.
- the respective heating resistor 6 is thus opposite the initially provided Stirring time longer energized and thus longer activated.
- the respective heating resistor 6 can act longer on the thermosensitive medium of the label 3 and cause a stronger color change or blackening. An age-related decline in the degree of color change or degree of blackening can thus be compensated.
- the control device 10 is here and preferably configured so that it does not change the voltage U and / or current I at the printing process performed with the increased energization duration.
- the voltage U and / or current I remains in comparison to at least the last preceding printing process, in which the threshold value R 1 was not exceeded, or in comparison to all previous printing processes in which the threshold value R 1 is not yet was exceeded, unchanged, here according to FIG. 3 at a value U 1 or I 1 .
- the voltage U and / or the current intensity I of the respective heating resistor 6 can also be increased as an additional compensatory measure to compensate for a decreasing degree of color change or blackening degree.
- the electrical resistance R of the respective heating resistor 6 is continuous, d. H. every time it is switched on, determined. The determination of the electrical resistance R takes place via a current measuring device 11 and / or a voltage measuring device 12.
- the control device 10 further has a comparator 13 which compares the respectively determined electrical resistance or the corresponding resistance value R of the respective heating resistor 6 with the predetermined threshold value R 1 .
- FIG. 2 shows a profile of the electrical resistance or resistance value R of one of the heating resistors 6 of the thermal strip 5.
- the heating resistor 6 has an electrical resistance R 0 at the beginning of its service life (time T 0 ).
- the electrical resistance R then drops by a plurality of printing operations in the course of the life of the heating resistor 6 and then increases again.
- the electrical resistance R eventually exceeds its initial value Ro and continues to increase.
- the direction of control 10 changes the energization duration of this heating resistor 6.
- the threshold value R 1 is above the initial value Ro of the heating resistor 6, which has the advantage that the increase in the energization duration is only carried out if the heating resistor 6 actually has a certain resistance over time. reached degree of wear. In this way, it can be ruled out that the energization duration is increased even at the beginning when the thermal strip 5 or the heating resistor 6 is still new, but where, as later in the critical state, it also has an electrical resistance R with a value of Ro.
- the control device 10 determining the initial state of the heating resistor 6, in which the duration of the energization is not yet to be increased, from the critical state, starting from which Bestromungsdauer is to be increased, can distinguish based on a stored over time series of resistance values, by comparing at least two consecutive resistance values can be concluded on an increase in the electrical resistance R. If the value Ro is then reached, the control device 10 recognizes that the critical state which requires an increase in the current supply duration is now reached.
- the Bestromungsdauer is adjusted according to the proposal as a function of the respectively determined electrical resistance R of the respective heating resistor 6, wherein the energization increases with increasing electrical resistance R, in Fig. 3a) is exemplified the original Bestromungsdauer of the heating resistor 6 with the resistance curve of FIG , This Bestromungsdauer is provided for the period from T 0 to T 1 in Fig. 2.
- Fig. 3b) shows an example of an increased energization time for comparison. The increased energization duration after reaching the time T 1 in Fig. 2, ie when exceeding the threshold value R 1 , provided. If the electrical resistance R of the heating resistor 6 continues to increase, in particular the energization duration is correspondingly further increased. As also shown in FIG. 3, the voltage U and the current I remain constant at the value U 1 or I 1 .
- the control device 10 also has a memory 14, in which the respective threshold value R 1 is stored.
- a separate threshold R 1 is stored in the memory 14 here and preferably for each of the heating resistors 6 .
- the threshold value R 1 is in particular 1 to 20%, preferably 1 to 10%, particularly preferably 1 to 5%, higher than the initial value R 0 for the electrical see resistance R of the heating resistor 6. In the present case, the threshold value R 1 is 15% higher than the output value Ro, as shown in FIG. 2 by way of example.
- control device 10 can also be configured in such a way that the respective threshold value R 1 or R 1 'is adapted continuously or at intervals, in particular at regular time intervals, starting from its initial value R 1 , in particular being raised, in FIG. 2 shown for the time T2.
- the adapted threshold value R 1 'then replaces the respective previous threshold value R 1 in the memory 14.
- no adjustment of the threshold value R 1 is provided, but this remains constant or unchanged at R 1 , as shown in FIG. 2.
- the Bestromungsdauer is adjusted here and preferably always based on the respectively determined electrical resistance R of the heating resistor 6, ie the energization time changes with each newly determined value for the electrical Resistance.
- the present invention also relates to a method for wear compensation of a label printer 2 which prints labels 3 by means of thermal printing, which method can preferably be carried out using the wear compensation device 1 described above
- the control device 10 which controls the thermal head 4 for printing the respective label 3
- performed wear compensation by the electrical resistance R of one or more heating resistors 6 of the thermal strip 5 of the thermal head 4 is monitored and at a predetermined Threshold R 1 for the electrical resistance R, the energization duration of the respective heating resistor 6 is increased during a printing operation.
Landscapes
- Electronic Switches (AREA)
- Labeling Devices (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102018106240.0A DE102018106240A1 (de) | 2018-03-16 | 2018-03-16 | Verschleißkompensationsvorrichtung eines Etikettendruckers |
PCT/EP2019/054688 WO2019174904A1 (de) | 2018-03-16 | 2019-02-26 | VERSCHLEIßKOMPENSATIONSVORRICHTUNG EINES ETIKETTENDRUCKERS |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3765299A1 true EP3765299A1 (de) | 2021-01-20 |
EP3765299B1 EP3765299B1 (de) | 2022-12-28 |
Family
ID=65598636
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19708068.2A Active EP3765299B1 (de) | 2018-03-16 | 2019-02-26 | Verschleisskompensationsvorrichtung eines etikettendruckers |
Country Status (11)
Country | Link |
---|---|
US (1) | US11981148B2 (de) |
EP (1) | EP3765299B1 (de) |
CN (1) | CN111836724B (de) |
AU (1) | AU2019235215B2 (de) |
CA (1) | CA3093867C (de) |
DE (1) | DE102018106240A1 (de) |
DK (1) | DK3765299T3 (de) |
EA (1) | EA039933B1 (de) |
ES (1) | ES2940655T3 (de) |
PL (1) | PL3765299T3 (de) |
WO (1) | WO2019174904A1 (de) |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4573058A (en) * | 1985-05-24 | 1986-02-25 | Ncr Canada Ltd - Ncr Canada Ltee | Closed loop thermal printer for maintaining constant printing energy |
JPS63317359A (ja) * | 1987-06-22 | 1988-12-26 | Minolta Camera Co Ltd | 多階調熱転写記録装置 |
JPH029644A (ja) * | 1988-06-28 | 1990-01-12 | Nec Home Electron Ltd | サーマルプリンタ |
US5172137A (en) | 1990-11-30 | 1992-12-15 | Kanzaki Paper Manufacturing Co., Ltd. | Thermal printer |
JPH05212892A (ja) | 1992-01-31 | 1993-08-24 | Ricoh Co Ltd | 記録濃度補正装置 |
US5608442A (en) * | 1994-08-31 | 1997-03-04 | Lasermaster Corporation | Heating control for thermal printers |
JP5647822B2 (ja) * | 2009-07-24 | 2015-01-07 | ローム株式会社 | サーマルプリントヘッド、サーマルプリンタおよびプリンタシステム |
CN103381711B (zh) * | 2012-05-04 | 2016-01-20 | 山东华菱电子股份有限公司 | 热敏打印头修阻方法及装置 |
CN103722907B (zh) * | 2012-10-15 | 2016-08-03 | 山东新北洋信息技术股份有限公司 | 打印机及其控制方法和装置 |
DE102015118732A1 (de) | 2015-11-02 | 2017-05-04 | Espera-Werke Gmbh | Vorrichtung und Verfahren zum Bedrucken von Etiketten mittels Thermodruck |
-
2018
- 2018-03-16 DE DE102018106240.0A patent/DE102018106240A1/de active Pending
-
2019
- 2019-02-26 ES ES19708068T patent/ES2940655T3/es active Active
- 2019-02-26 DK DK19708068.2T patent/DK3765299T3/da active
- 2019-02-26 EA EA202092193A patent/EA039933B1/ru unknown
- 2019-02-26 WO PCT/EP2019/054688 patent/WO2019174904A1/de active Application Filing
- 2019-02-26 CN CN201980019744.9A patent/CN111836724B/zh active Active
- 2019-02-26 CA CA3093867A patent/CA3093867C/en active Active
- 2019-02-26 US US16/979,060 patent/US11981148B2/en active Active
- 2019-02-26 EP EP19708068.2A patent/EP3765299B1/de active Active
- 2019-02-26 AU AU2019235215A patent/AU2019235215B2/en active Active
- 2019-02-26 PL PL19708068.2T patent/PL3765299T3/pl unknown
Also Published As
Publication number | Publication date |
---|---|
US11981148B2 (en) | 2024-05-14 |
AU2019235215B2 (en) | 2021-07-29 |
EP3765299B1 (de) | 2022-12-28 |
PL3765299T3 (pl) | 2023-05-08 |
EA039933B1 (ru) | 2022-03-29 |
CA3093867C (en) | 2023-03-07 |
US20230202197A1 (en) | 2023-06-29 |
DE102018106240A1 (de) | 2019-10-02 |
EA202092193A1 (ru) | 2021-01-13 |
CN111836724A (zh) | 2020-10-27 |
ES2940655T3 (es) | 2023-05-10 |
CN111836724B (zh) | 2022-08-30 |
DK3765299T3 (da) | 2023-03-20 |
CA3093867A1 (en) | 2019-09-19 |
AU2019235215A1 (en) | 2020-10-08 |
WO2019174904A1 (de) | 2019-09-19 |
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