EP1645424B1 - Bogenhandhabungsvorrichtung mit temperaturgesteuerter Trägerplatte für Bogen - Google Patents

Bogenhandhabungsvorrichtung mit temperaturgesteuerter Trägerplatte für Bogen Download PDF

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Publication number
EP1645424B1
EP1645424B1 EP05108840A EP05108840A EP1645424B1 EP 1645424 B1 EP1645424 B1 EP 1645424B1 EP 05108840 A EP05108840 A EP 05108840A EP 05108840 A EP05108840 A EP 05108840A EP 1645424 B1 EP1645424 B1 EP 1645424B1
Authority
EP
European Patent Office
Prior art keywords
plate
temperature
sheet
handling device
support plate
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.)
Not-in-force
Application number
EP05108840A
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English (en)
French (fr)
Other versions
EP1645424A1 (de
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
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Filing date
Publication date
Application filed by Oce Technologies BV filed Critical Oce Technologies BV
Priority to EP05108840A priority Critical patent/EP1645424B1/de
Publication of EP1645424A1 publication Critical patent/EP1645424A1/de
Application granted granted Critical
Publication of EP1645424B1 publication Critical patent/EP1645424B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • 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
    • 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
    • B41J11/02—Platens
    • B41J11/06—Flat page-size platens or smaller flat platens having a greater size than line-size platens

Definitions

  • the invention relates to a sheet handling device comprising: a sheet support plate made of a heat conductive material having a first heat capacity, said plate having at least one cavity formed between a top wall defining a top surface of the plate and a bottom wall defining a bottom surface of the plate; and a temperature control system including a circulating system for circulating a temperature control fluid through said cavity.
  • 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 the cavity in the plate in order to control the temperature of the plate.
  • the surface of the sheet support plate should be perfectly flat, at least in the region where the image is being printed.
  • the support plate should have a sufficient strength so that it will not bend under mechanical or thermal stress.
  • the plate must have a certain minimum thickness, and this implies a certain minimum volume of the cavity.
  • 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. As a result, like in US 2002/0071016, when a new image is to be printed, it will take a certain time until the sheet support plate has been heated to its operating temperature.
  • this object is achieved by a sheet handing device of the type indicated above, wherein the cavity contains a displacement body which is spaced apart from the top wall of the cavity and is made of a material having a second heat capacity which is smaller that said first heat capacity of the material of the plate.
  • the displacement body reduces the effective volume of the cavity but, thanks to its smaller heat capacity, does not significantly increase the overall heat capacity of the plate. As a result, the volume of the temperature control fluid that is needed for filling the cavity is reduced and, consequently, less time and/or heating power is needed for heating the fluid and hence the plate to its operating temperature.
  • the fluid may circulate through hollow spaces near both the top wall and the bottom wall of the cavity, so that the top and bottom surfaces of the plate may always be kept on the same temperature and a thermal distortion of the plate is prevented.
  • the sheet support plate has a plurality of elongated cavities which extend in parallel through the plate and are separated by separating walls. This assures a high rigidity of the plate.
  • the separating walls may be formed with trough-holes which connect the top surface of the plate to a suction chamber provided at the bottom surface thereof, so that the sheet may be sucked against the top surface of the plate. This assures a perfectly flat configuration of the sheet, especially in the region where the image is being formed, and at the same time assures a good thermal contact between the sheet and the plate.
  • the displacement bodies may then simply be formed by bars made of synthetic resin such as polystyrene, which are inserted into each of the cavities and may easily be manufactured as extruded profiles or the like.
  • the displacement bodies are in contact with the separating walls of the plate, so that each cavity is divided into two passages which extend near the top surface and the bottom surface, respectively, of the plate and are only connected to one another and to the circulating system at the respective ends of the cavities.
  • the displacement bodies may be made of a material which shows a phase transition with a relatively high latent heat at a transition temperature close to the operating temperature of the plate.
  • the transition may be one between a liquid state and a crystalline, semi-crystalline or amorphous solid state.
  • the displacement bodies or at least parts thereof may melt, with absorption of latent heat, so that the temperature of the plate is returned to the operating temperature.
  • the displacement bodies will solidify and will release the latent heat.
  • the temperature of the plate is stabilized at the operating temperature.
  • At least part of the material of the displacement bodies is in the high-temperature state, e. g. the molten state, when the plate has its operating temperature. Then, when the printer enters into the sleep mode and the heating system for the plate, i. e. the heating system which heats the temperature control fluid, is switched off, the displacement bodies will release their latent heat, and the cooling-down of the plate is delayed. As a result, when the printer is activated again after a short interval, the plate will still have a high temperature, and the operating temperature may quickly be re-established with reduced energy consumption.
  • 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 circulating 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 temperature control system 30 includes heaters, temperature sensors, heat sinks, and the like for controlling the temperature of the fluid, as well as a pump or other displacement means for circulating the fluid through the interior of the sheet support plate 14, as will now be described in detail in conjunction with Fig. 2.
  • the sheet support plate 14 which has been shown in cross-section in Fig. 2, is made of a material, such as a metal, having a relatively high heat conductivity and also a relatively high heat capacity.
  • a number of elongated cavities 34 are formed in the interior of the plate 14 so as to extend in parallel with one another and in parallel with the direction (B) of travel of the carriage 22 between opposite ends of the plate 14, where they are connected to the tubes 32 through suitable manifolds.
  • Each cavity 34 is delimited by a top wall 36, a bottom wall 38 and two separating walls 40.
  • the top walls 36 together, define the top surface 42 of the plate 14 which is machined to be perfectly flat.
  • a hollow space 44 is formed, through which the suction holes 24 pass through into the suction chamber 26.
  • a bar-shaped displacement body 46 having a rectangular cross-section has been inserted in medium height in each of the cavities 34, so that each cavity is divided, over its entire length, into two separate passages 48, 50, and the effective volume of the cavity 34 is reduced significantly.
  • the displacement bodies 46 are made of polystyrene, for example, and in any case have a heat capacity that is significantly lower than that of the material of the plate 14. Thus, the bodies 46 do not substantially add to the overall heat capacity of the sheet support plate 14 and, accordingly, do not increase the amount of time and energy needed for heating the plate 14 to a predetermined temperature.
  • the displacement bodies 46 may be held in place in the cavities 34 by means of an adhesive, for example.
  • the profile of the plate 14 may be modified such that the separating walls 40 are provided with ribs for guiding and supporting the displacement bodies 46.
  • only the end portions of the bar-shaped displacement bodies 46 may be held in position in the manifolds at both ends of the plate 14.
  • the fluid flows through the passages 48 and 50 of each cavity 34 in the same direction, so that the temperature of the bottom wall 38 of the cavities will always be equal to temperature of the top wall 36, and the plate 14, as a whole, is not caused to bend due to differential thermal expansion.
  • a more complex circulating system may be used which causes the fluid in adjacent cavities 34 to flow in opposite directions, so as to minimize a possible temperature gradient in lengthwise direction (arrow B) of the plate 14.
  • the heater integrated in the temperature control system 30 will heat the fluid, and the fluid will be circulated through the passages 48, 50 until the plate 14 has been brought to its operating temperature, i.e. a temperature which assures an appropriate cooling rate for the droplets of hot melt ink that have been jetted onto the paper. Since the volume of fluid to be heated is small, the required operating temperature can be reached in a reduced time and with reduced power consumption.
  • the sheet 12 and the plate 14 will be heated by the ink deposited on the sheet, and the temperature control system 30 switches from a heating mode to a temperature control mode in order to keep the temperature of the plate 14 constant. Since at least one half of the fluid circulating through the cavities 34 is forced to pass through the passages 50 near the bottom walls 38 of the cavities, these bottom walls 38, which are exposed to the suction chamber 26, may efficiently be used as heat sinks which prevent the temperature of the fluid from increasing beyond a tolerable limit. Moreover, the reduced volume of fluid shortens the response time for the thermostatic control.
  • Fig. 3 shows a modified embodiment of the sheet support plate 14, in which displacement bodies 46' in the cavities 34 are hollow bodies which enclose a material 52a, 52b, e. g. a wax or the like, which, at a certain transition point or in a transition temperature range, undergoes a transition between a high-temperature phase 52b and a low temperature phase 52a with release of latent heat.
  • the transition point or range is equal to or close to the operating temperature of the plate 14.
  • Fig. 3 which corresponds to the operating condition of the plate 14, only part of the material contained in the bodies 46' is in the low-temperature phase 52a and forms a solid core, whereas the rest of the material is in a molten state, i. e. the high-temperature phase 52b.
  • the temperature T of the material 52a, 52b has been shown as a function of the heat content Q of a given volume of this material. It can be seen that, within a narrow transition temperature range from T 1 to T 2 , the heat content increases drastically from Q 1 to Q 2 , corresponding to the latent heat of the phase transition. As a result, the temperature of the material 52a, 52b and, therewith, the temperature of the plate 14 can easily be stabilized in the range between T1 and T2, i. e. at the operating temperature.
  • the printer When the printer enters into a sleep-mode and the heater in the temperature control system 30 is switched off, the core 52a grows on the cost of the molten phase 52b and the latent heat is released, so that the plate 14 will essentially retain its operating temperature for an extended time period.
  • the print process can start immediately, because the plate 14 still has its operating temperature. If the sleep-mode continues for a longer time period, the temperature drops below T 1 , but when the heater is switched on again, the temperature T 1 and hence the operating temperature can quickly be recovered by supplying only a little amount of heat.
  • a paper handling device comprising a sheet support plate 14, heating and temperature control means 30 for heating the sheet support plate 14 to a predetermined operating temperature and keeping it at that temperature, and buffer bodies 46' integrated in the sheet support plate 14, said buffer bodies containing a material 52a, 52b, which, at a temperature point or in a temperature range T 1 - T 2 at or near the operating temperature, undergoes a phase transition from a high-temperature phase 52b to a low-temperature phase 52a with release of latent heat.

Claims (8)

  1. Bogenhandhabungsvorrichtung mit einer Bogenträgerplatte (14) aus einem wärmeleitfähigen Material, das eine erste Wärmekapazität aufweist, welche Platte wenigstens einen Hohlraum (34) aufweist, der zwischen einer oberen Wand (36), die eine obere Oberfläche (42) der Platte (14) definiert, und einer unteren Wand (38) gebildet ist, die eine untere Oberfläche der Platte definiert, und einem Temperatursteuersystem (30) mit einem Umwälzsystem (32) zum Umwälzen eines Temperatursteuerfluids durch den Hohlraum (34), dadurch gekennzeichnet, daß der Hohlraum (34) einen Verdrängungskörper (46; 46') enthält, der von der oberen Wand (36) beabstandet ist und aus einem Material besteht, das eine zweite Wärmekapazität hat, die kleiner ist als die genannte erste Wärmekapazität.
  2. Bogenhandhabungsvorrichtung nach Anspruch 1, bei der der Verdrängungskörper (46) auch von der unteren Wand (38) des Hohlraums (34) beabstandet ist.
  3. Bogenhandhabungsvorrichtung nach Anspruch 1 oder 2, bei der der Verdrängungskörper (46) aus Kunststoff besteht.
  4. Bogenhandhabungsvorrichtung nach Anspruch 3, bei der der Verdrängungskörper (46) aus Polystyrol besteht.
  5. Bogenhandhabungsvorrichtung nach einem der vorstehenden Ansprüche, mit mehreren Hohlräumen (34), die parallel zueinander angeordnet und durch Trennwände (40) aus dem Material mit der genannten ersten Wärmekapazität getrennt sind.
  6. Bogenhandhabungsvorrichtung nach Anspruch 5, bei der die Bogenträgerplatte (14) Sauglöcher (24) aufweist, die von der oberen Oberfläche (42) zur unteren Oberfläche der Platte durchgehen und durch die Trennwände (40) von den Hohlräumen (34) getrennt sind.
  7. Bogenhandhabungsvorrichtung nach einem der vorstehenden Ansprüche, bei der der Verdrängungskörper (46') ein Material (52a, 52b) enthält, das bei einer vorbestimmten Temperatur oder innerhalb eines vorbestimmten Temperaturbereiches (T1 - T2) einen Phasenübergang von einer Hochtemperaturphase (52b) in eine Tieftemperaturphase (52a) unter Freisetzung von latenter Wärme erfährt.
  8. Tintenstrahldrucker für heißschmelzende Tinte, mit einer Bogenhandhabungsvorrichtung nach einem der Ansprüche 1 bis 7.
EP05108840A 2004-10-04 2005-09-26 Bogenhandhabungsvorrichtung mit temperaturgesteuerter Trägerplatte für Bogen Not-in-force EP1645424B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP05108840A EP1645424B1 (de) 2004-10-04 2005-09-26 Bogenhandhabungsvorrichtung mit temperaturgesteuerter Trägerplatte für Bogen

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP04104858 2004-10-04
EP05108840A EP1645424B1 (de) 2004-10-04 2005-09-26 Bogenhandhabungsvorrichtung mit temperaturgesteuerter Trägerplatte für Bogen

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EP1645424A1 EP1645424A1 (de) 2006-04-12
EP1645424B1 true EP1645424B1 (de) 2007-05-30

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EP05108840A Not-in-force EP1645424B1 (de) 2004-10-04 2005-09-26 Bogenhandhabungsvorrichtung mit temperaturgesteuerter Trägerplatte für Bogen

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112477432B (zh) * 2020-11-26 2022-07-26 桂林澳群彩印有限公司 一种喷印机用恒温工作板

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* Cited by examiner, † Cited by third party
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US6406140B1 (en) * 2000-12-08 2002-06-18 Hewlett-Packard Company Anisotropic thermal conductivity on a heated platen
JP2003262482A (ja) * 2002-03-07 2003-09-19 Osaka Gas Co Ltd 熱搬送材及び熱搬送システム

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