EP1679572A1 - Système de contrôle de la température pour un plateau de support de feuille d'une imprimante - Google Patents

Système de contrôle de la température pour un plateau de support de feuille d'une imprimante Download PDF

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Publication number
EP1679572A1
EP1679572A1 EP05112663A EP05112663A EP1679572A1 EP 1679572 A1 EP1679572 A1 EP 1679572A1 EP 05112663 A EP05112663 A EP 05112663A EP 05112663 A EP05112663 A EP 05112663A EP 1679572 A1 EP1679572 A1 EP 1679572A1
Authority
EP
European Patent Office
Prior art keywords
temperature control
power
control system
printer
heater
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
Application number
EP05112663A
Other languages
German (de)
English (en)
Other versions
EP1679572B1 (fr
Inventor
Pieter G.M. Kruijt
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Canon Production Printing Netherlands BV
Original Assignee
Oce Technologies BV
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Oce Technologies BV filed Critical Oce Technologies BV
Priority to EP20050112663 priority Critical patent/EP1679572B1/fr
Publication of EP1679572A1 publication Critical patent/EP1679572A1/fr
Application granted granted Critical
Publication of EP1679572B1 publication Critical patent/EP1679572B1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • B41J29/00—Details of, or accessories for, typewriters or selective printing mechanisms not otherwise provided for
    • B41J29/377—Cooling or ventilating arrangements
    • 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 arrangements  of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form
    • B41J11/0085—Using suction for maintaining printing material flat
    • 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
    • B41J2/17—Ink jet characterised by ink handling
    • B41J2/175—Ink supply systems ; Circuit parts therefor
    • B41J2/17593—Supplying ink in a solid state

Definitions

  • the invention relates to a temperature control system for a sheet support plate of a printer which has at least two power supplies for powering different sub-systems of the printer, the temperature control system comprising at least one heater.
  • a temperature controlled sheet support plate is frequently used for supporting an image receiving sheet and at the same time controlling the temperature thereof.
  • a sheet e. g. a sheet of paper
  • the hot melt ink is solid, and it is therefore necessary that the ink is heated in the printer above its melting point, before it can be jetted onto the paper.
  • the ink droplets that have been jetted onto the paper tend to spread-out more or less before the ink solidifies.
  • the temperature of the sheet support plate and hence the temperature of the paper should be controlled such that the ink cools down at an appropriate rate.
  • a temperature control fluid e. g. a liquid, may be passed through a cavity in the plate in order to control the temperature of the plate.
  • the printer For reasons of power consumption, it is required that the printer enters into a so-called sleep mode, when the printer is not operating for a certain time, and in the sleep mode, among others, the heating system for the sheet support plate is switched off. Thus, when the printer is switched on or is switched from the sleep mode into the operating mode again, it will take a certain time until the sheet support plate has been heated to its operating temperature. In order to shorten this warming-up process of the sheet support plate, a considerable heating power is required.
  • a temperature control system of the type indicated above which further comprises a power management system adapted to use spare power capacities of said at least two power supplies by controlling the power supplied to said at least one heater in accordance with the load conditions of said power supplies.
  • a conventional temperature control system for a sheet support plate there may be provided an extra power supply for the heater of the temperature control system, or a power supply that is dedicated to a sub-system of the printer may be dimensioned so as to provide the power for the heater needed during a warming-up process in addition to the power required by the sub-system.
  • the temperature control system requires much less power.
  • the extra power supply or the capacity of the existing power supply will be utilized mainly during the warming-up process and will be idle most of the time.
  • the power capacity is not used efficiently.
  • high power consumption peaks that stress the power net of the printer may occur during the warming-up process.
  • an extra power supply can be dispensed with, and the heater of the temperature control system uses the spare power capacities of the power supplies dedicated to other devices or sub-systems of the printer. Because the power management system shares two or more power supplies, the required heating power for the warming-up process can be provided very efficiently. Thus, the power capacities of the present power supplies are used very efficiently. Moreover, the load of the power supplies due to the power consumption of the other sub-systems and of the heater can be balanced. By this load-balancing, power consumption peaks can be avoided and the dimensions of the power supplies may be reduced.
  • the at least one heater is adapted to be operated on at least two different levels of power consumption.
  • a heater may be operated at different input voltages, or the current supplied to the heater may be limited in accordance with the load conditions of the power supplies.
  • the input voltage or the current intensity is continuously adjustable.
  • the temperature control system comprises at least two heaters adapted to be powered by different power supplies.
  • two heaters may have different electrical resistance, so that different heating powers can be achieved at the same input voltage, or the heaters may be adapted to different input voltages.
  • the power management system is enabled to operate the heaters simultaneously. Thereby, a maximum heating power can be achieved.
  • the at least two power supplies are dedicated to different sub-systems having varying power consumption.
  • a first power supply may be dedicated to the movement of a printhead carriage, and a second power supply may be dedicated to heating the printheads to their operation temperature.
  • the at least two power supplies may have different output voltages as, for example, the mentioned devices of the printer may require different input voltages.
  • the sheet support plate has at least one cavity
  • the temperature control system further comprises a circulation system for circulating a temperature control fluid through said cavity, the at least one heater being arranged to heat the temperature control fluid. Then, the temperature of the temperature control fluid may also be cooled to control its temperature.
  • a hot melt ink jet printer comprises a platen 10 which is intermittently driven to rotate in order to advance a sheet 12, e. g. a sheet of paper, in a direction indicated by an arrow A over the top surface of a sheet support plate 14.
  • a number of transport rollers 16 are rotatably supported in a cover plate 18 and form a transport nip with the platen 10, so that the sheet 12, which is supplied from a reel (not shown) via a guide plate 20, is paid out through a gap formed between an edge of the cover plate 18 and the surface of the sheet support plate 14.
  • a carriage 22 which includes a number of ink jet printheads (not shown) is mounted above the sheet support plate 14 so as to reciprocate in the direction of arrows B across the sheet 12.
  • a number of pixel lines are printed on the sheet 12 by means of the printheads which eject droplets of hot melt ink onto the sheet in accordance with image information supplied to the printheads.
  • guide and drive means for the carriage 22, ink supply lines and data supply lines for the printheads, and the like, have not been shown in the drawing.
  • the top surface of the sheet support plate 14 has a regular pattern of suction holes 24 which pass through the plate and open into a suction chamber 26 that is formed in the lower part of the plate 14.
  • the suction chamber is connected to a blower 28 which creates a subatmospheric pressure in the suction chamber, so that air is drawn-in through the suction holes 24.
  • the sheet 12 is sucked against the flat surface of the support plate 14 and is thereby held in a flat condition, especially in the area which is scanned by the carriage 22, so that a uniform distance between the nozzles of the printheads and the surface of the sheet 12 is established over the whole width of the sheet and a high print quality can be achieved.
  • the droplets of molten ink that are jetted out from the nozzles of the printheads have a temperature of 100° C or more and cool down and solidify after they have been deposited on the sheet 12.
  • the heat of the ink must be dissipated with a sufficient rate.
  • the temperature of the sheet 12 should not be too low, because otherwise the ink droplets on the sheet 12 would be cooled too rapidly and would not have time enough to spread-out. For this reason, the temperature of the sheet 12 is controlled via the sheet support plate 14 by means of a temperature control system 30 which circulates a temperature control fluid, preferably a liquid, through the plate 14.
  • the temperature control system includes a circulation system with tubes 32 that are connected to opposite ends of the plate 14. One of the tubes passes through an expansion vessel 33 containing a gas buffer for absorbing temperature-dependent changes in the volume of the liquid.
  • the sheet support plate 14 is schematically shown.
  • a cavity 50 of the circulation system forms a heat exchanger below the top surface of the sheet support plate 14.
  • the blower 28 is also shown symbolically.
  • the temperature control system 30 comprises a radiator 52 with a cooling fan 54 that forms a heat sink of the circulation system.
  • the circulation system further comprises a pump 56 or other displacement means for circulating the fluid through the cavity 50 of the sheet support plate 14.
  • the circulation system further comprises a first heater 58 and a second heater 60 which are controlled by a power management system 62 that is symbolized by a first driver 64 and a second driver 66.
  • the drivers 64, 66 may be current limiters.
  • the temperature control system 30 also includes temperature sensors and control means for the cooling fan and the like for controlling the temperature of the fluid.
  • the first driver 64 connects the first heater 58 to a 48 V power supply 68, while the second driver 66 connects the second heater 60 to a 24 V power supply 70.
  • the 48 V power supply 68 is mainly dedicated to a heater for the printheads on the carriage 22, the heater being symbolically shown as an electrical load 72.
  • the 24 V power supply 70 is mainly dedicated to operate the drive means of the carriage 22 which are symbolically shown as an electrical load 74.
  • control means for the heater of the printheads and for the drive means of the carriage 22 have not been shown in the drawing.
  • the power management system 62 can operate each of the heaters 58, 60 at varying input voltages or varying current intensities, and, thus, varying levels of power consumption.
  • the sheet support plate 14 When the printer has been in an off-state or in a low power mode or sleep mode, the sheet support plate 14 has to be heated to its operation temperature of, for example, 32° C in a warming-up process, in order to start printing again. This requires, for example, a power of 200 W.
  • the 24 V power supply 70 is barely used, since it is dedicated to powering the drive means for the carriage 22 when printing. Therefore, the spare power capacities of the 24 V power supply 70 will be allotted to the heater 60 by the power management system 62.
  • the 48 V power supply 68 is needed to heat the printheads on the carriage 22 to their operation temperature during the start-up of the printer. Therefore, the 48 V power supply 68 is already used almost to its limit during the warming-up process. However, when the printheads have reached their operating temperature, the sheet support plate 14 still needs to be warmed. Then, less power is needed to heat the printheads. Therefore, the power management system 62 will allot spare power capacities of the 48 V power supply 68 to the first heater 58. During printing, though the 24 V power supply 70 is needed for the drive means of the carriage 22, spare power capacities of the 24 V power supply 70 may still be allotted to the second heater 60.
  • Fig. 3 schematically shows power diagrams for the power supplies 68, 70.
  • the power P 1 of the 48 V power supply 68 and the power P 2 of the 24 V power supply 70 are separately shown in relation to the time t.
  • Power limits of the power supplies 68, 70 are indicated by dashed lines.
  • the power P 1 is the sum of the power 76 used by the electrical load 72 of the heater for the printheads and the power 78 that is allotted by the power management system 62 to the first heater 58.
  • the power P 2 is the sum of the power 80 required by the drive means of the carriage 22, i. e. the electrical load 74, and the power 82 that is allotted to the second heater 60.
  • the individual powers 76, 78, 80, and 82 vary over the time t, while the sum of the powers 78 and 82 that are used for the heaters 58 and 60 is approximately constant. Yet, there are situations where almost the full power of a power supply is provided to the device the power supply is dedicated to.
  • An arrow 84 indicates, for example, a situation where the power P 1 is almost used up by the electrical load 72 of the heater for the printheads. At this point, the power limits of P 1 and P 2 are reached, and the sum of the powers 78 and 82 is less than under the other conditions.
  • momentary electrical loads 72, 74 of the heater for the printheads and the drive means for the carriage 22, and the momentary electrical loads of the heaters 58, 60 are balanced so that the power limits of the power supplies 68, 70 are not exceeded.

Landscapes

  • Ink Jet (AREA)
EP20050112663 2004-12-29 2005-12-21 Système de contrôle de la température pour un plateau de support de feuille d'une imprimante Ceased EP1679572B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP20050112663 EP1679572B1 (fr) 2004-12-29 2005-12-21 Système de contrôle de la température pour un plateau de support de feuille d'une imprimante

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP04107043 2004-12-29
EP20050112663 EP1679572B1 (fr) 2004-12-29 2005-12-21 Système de contrôle de la température pour un plateau de support de feuille d'une imprimante

Publications (2)

Publication Number Publication Date
EP1679572A1 true EP1679572A1 (fr) 2006-07-12
EP1679572B1 EP1679572B1 (fr) 2009-03-25

Family

ID=36569841

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20050112663 Ceased EP1679572B1 (fr) 2004-12-29 2005-12-21 Système de contrôle de la température pour un plateau de support de feuille d'une imprimante

Country Status (1)

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EP (1) EP1679572B1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1980925A1 (fr) * 2007-04-13 2008-10-15 Océ-Technologies B.V. Procédé et unité de contrôle pour le contrôle de l'alimentation électrique fournie à une pluralité de sources de chaleur dans une imprimante
US10286671B2 (en) * 2017-01-26 2019-05-14 Kyocera Document Solutions Inc. Inkjet recording apparatus

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0924593A2 (fr) * 1997-12-17 1999-06-23 Canon Kabushiki Kaisha Système et procédé de régulation de puissance
US5995397A (en) * 1997-08-27 1999-11-30 Samsung Electronics Co. Ltd. Power supply controlling apparatus for printer
EP0987605A2 (fr) * 1998-08-07 2000-03-22 Samsung Electronics Co., Ltd. Méthode pour controler l' alimentation électrique des sources de chaleur d' une machine à imprimer et appareil pour cette méthode
US20040017435A1 (en) * 2002-07-23 2004-01-29 Canon Kabushiki Kaisha Ink jet printing apparatus and ink jet printing method
US20040042825A1 (en) * 2002-06-20 2004-03-04 Motokazu Yasui Fixing device and image forming apparatus

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5995397A (en) * 1997-08-27 1999-11-30 Samsung Electronics Co. Ltd. Power supply controlling apparatus for printer
EP0924593A2 (fr) * 1997-12-17 1999-06-23 Canon Kabushiki Kaisha Système et procédé de régulation de puissance
EP0987605A2 (fr) * 1998-08-07 2000-03-22 Samsung Electronics Co., Ltd. Méthode pour controler l' alimentation électrique des sources de chaleur d' une machine à imprimer et appareil pour cette méthode
US20040042825A1 (en) * 2002-06-20 2004-03-04 Motokazu Yasui Fixing device and image forming apparatus
US20040017435A1 (en) * 2002-07-23 2004-01-29 Canon Kabushiki Kaisha Ink jet printing apparatus and ink jet printing method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1980925A1 (fr) * 2007-04-13 2008-10-15 Océ-Technologies B.V. Procédé et unité de contrôle pour le contrôle de l'alimentation électrique fournie à une pluralité de sources de chaleur dans une imprimante
US7971955B2 (en) 2007-04-13 2011-07-05 Oce-Technologies B.V. Method and control unit for controlling the power supplied to a plurality of heat sources in a printer
US10286671B2 (en) * 2017-01-26 2019-05-14 Kyocera Document Solutions Inc. Inkjet recording apparatus

Also Published As

Publication number Publication date
EP1679572B1 (fr) 2009-03-25

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