EP1317342B1 - Tintenstrahl-druckvorrichtung - Google Patents

Tintenstrahl-druckvorrichtung Download PDF

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Publication number
EP1317342B1
EP1317342B1 EP01976229.3A EP01976229A EP1317342B1 EP 1317342 B1 EP1317342 B1 EP 1317342B1 EP 01976229 A EP01976229 A EP 01976229A EP 1317342 B1 EP1317342 B1 EP 1317342B1
Authority
EP
European Patent Office
Prior art keywords
medium
ink jet
jet printer
distance
print head
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.)
Expired - Lifetime
Application number
EP01976229.3A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1317342A2 (de
Inventor
Franz Obertegger
Mario Gandini
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.)
Durst Phototechnik AG
Original Assignee
Durst Phototechnik AG
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 Durst Phototechnik AG filed Critical Durst Phototechnik AG
Publication of EP1317342A2 publication Critical patent/EP1317342A2/de
Application granted granted Critical
Publication of EP1317342B1 publication Critical patent/EP1317342B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B41J25/00—Actions or mechanisms not otherwise provided for
    • B41J25/304—Bodily-movable mechanisms for print heads or carriages movable towards or from paper surface
    • B41J25/308—Bodily-movable mechanisms for print heads or carriages movable towards or from paper surface with print gap adjustment mechanisms
    • B41J25/3086—Bodily-movable mechanisms for print heads or carriages movable towards or from paper surface with print gap adjustment mechanisms with print gap adjustment means between the print head and its carriage
    • 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
    • B41J11/0065—Means for printing without leaving a margin on at least one edge of the copy material, e.g. edge-to-edge printing
    • 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
    • B41J11/007—Conveyor belts or like feeding devices
    • 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
    • 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
    • B41J11/20—Platen adjustments for varying the strength of impression, for a varying number of papers, for wear or for alignment, or for print gap adjustment
    • 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
    • B41J13/00—Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, specially adapted for supporting or handling copy material in short lengths, e.g. sheets
    • B41J13/0072—Handling wide cut sheets, e.g. using means for enabling or facilitating the conveyance of wide sheets
    • 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
    • B41J15/00—Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, specially adapted for supporting or handling copy material in continuous form, e.g. webs
    • B41J15/005—Forming loops or sags in webs, e.g. for slackening a web or for compensating variations of the amount of conveyed web material (by arranging a "dancing roller" in a sag of the web material)
    • 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
    • B41J15/00—Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, specially adapted for supporting or handling copy material in continuous form, e.g. webs
    • B41J15/04—Supporting, feeding, or guiding devices; Mountings for web rolls or spindles
    • B41J15/046—Supporting, feeding, or guiding devices; Mountings for web rolls or spindles for the guidance of continuous copy material, e.g. for preventing skewed conveyance of the continuous copy material
    • 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
    • B41J15/00—Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, specially adapted for supporting or handling copy material in continuous form, e.g. webs
    • B41J15/16—Means for tensioning or winding the web
    • B41J15/165—Means for tensioning or winding the web for tensioning continuous copy material by use of redirecting rollers or redirecting nonrevolving guides
    • 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
    • B41J25/00—Actions or mechanisms not otherwise provided for
    • B41J25/304—Bodily-movable mechanisms for print heads or carriages movable towards or from paper surface
    • B41J25/308—Bodily-movable mechanisms for print heads or carriages movable towards or from paper surface with print gap adjustment mechanisms
    • 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
    • B41J3/4078—Printing on textile
    • 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
    • B41J15/00—Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, specially adapted for supporting or handling copy material in continuous form, e.g. webs
    • B41J15/04—Supporting, feeding, or guiding devices; Mountings for web rolls or spindles
    • B41J15/048—Conveyor belts or like feeding devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2301/00—Handling processes for sheets or webs
    • B65H2301/20—Continuous handling processes
    • B65H2301/21—Continuous handling processes of batches of material of different characteristics
    • B65H2301/212—Continuous handling processes of batches of material of different characteristics of different thickness

Definitions

  • the invention relates to an ink jet printing device for media, as described in the preamble of claim 1, and a method for printing on media.
  • inkjet printers There are a variety of inkjet printers known - US 6,092,890 A . EP 0 842 051 1 B1 . DE 4 019 543 A . DE 3 417 376 A which have proven themselves for a wide variety of applications.
  • the inkjet printers are suitable for the printing of a variety of media, such as paper, plastic films, especially with different absorbency and porosity. Each of these media requires a different approach. A disadvantage was therefore that such devices were each suitable only for a specific medium.
  • the US 6,005,593 A describes a printing device of the type of ink jet printer for recording images on paper, plastic films or the like.
  • the sheets of the printing medium are thereby moved by a feed or a transport device below the print head which can be moved back and forth transversely to the transport direction, the print medium being supported in the area below the print head by the guide surface of a support plate.
  • a feed or a transport device below the print head which can be moved back and forth transversely to the transport direction, the print medium being supported in the area below the print head by the guide surface of a support plate.
  • the lower conveyor rollers of the transport device can be lowered together with the pressure medium supporting the support plate and so the space between the printheads and this support plate is increased.
  • the JP 10 157 245 A describes a printing device for printing on boxes. It is provided that a box is transported on a guide surface and through each other opposite printheads two sides of the box can be printed simultaneously. The box is guided between a lateral guide surface on one side and a movable guide surface on the other side, wherein the distance between the printheads and the respective side surfaces of the box can be regulated by pressing the movable guide surface in the direction of the fixed guide surface.
  • the printing medium is moved between a thennoprinting head and a support roller, wherein the distance between the printhead and the support roller can be regulated according to the thickness of the printing medium.
  • the printing device has a sensor by which the distance of the print head to the surface of the object to be printed can be measured.
  • the print head is adjusted in the vertical direction based on the distance detected by the sensor, so that the distance between the print head and the surface of the object to be printed can be kept constant.
  • a printing device in which the distance between the print medium guide plane and the print head can be kept constant.
  • the position of the management level is determined by two support rollers over which an endless conveyor belt for the pressure medium is guided.
  • the support rollers can be adjusted in their relative position to the print head, the transport device being equipped with a mechanism which ensures that the tension of the endless conveyor belt can be kept constant.
  • an ink jet printing apparatus for printing on textiles.
  • the textile fabric is fed to the printing device in the form of wound on rolls fabric webs.
  • the printing device is formed with a transport device, wherein the fabric web is guided around a movable roller, so that the fabric web forms a loop and is kept taut.
  • the invention is based on the object; to provide an ink jet printing device that can be used flexibly for a variety of media.
  • a sensitive control of the feed movement and / or the orientation of the medium is achieved by the embodiment according to claim 12.
  • a sensitive effect on the medium to be printed is possible because, according to the type and consistency of the medium, such as intrinsically rigid materials or flimsy materials, the rollers are used multiple times.
  • the embodiments according to claim 14 and 15 are suitable.
  • the ink jet printing device is characterized in that it can be used to print both roll and sheet media, both flexible and stiff, as well as impermeable and porous media, since the distance between the medium and the printhead assembly or the printhead and the respective nozzle for each color can be adjusted individually to the predeterminable conditions.
  • the one or more push buttons or nozzles with respect to a printing table or its support surface or the top of the media are mounted so that they in relation to the distance from the printing table and thus from the medium to be printed and / or the lateral orientation of the medium are flexibly adjustable.
  • the ink jet printing device according to the invention is due to this feature for guiding media with different properties in different ways, especially in a height adapted to the properties of the medium over the printing table and in one qualitatively consistent and reliable way to print.
  • a fully automatic Einjust Schlieren the printing device to different media thickness can be easily made, whereby it is possible to determine before the start of the printing process, if the thickness of the introduced medium matches the preset value to misprints damage to the printing device to prevent.
  • the avoidance of errors when inserting the different media can be further improved by the embodiments of claims 34 to 37.
  • an embodiment variant according to claim 40 is advantageous since it allows a rapid zeroing or system device to be achieved when printing different media.
  • a further development according to claim 41 is also advantageous, since precise control for each nozzle of a print head or a printhead arrangement is thus possible, and therefore also different adjustments corresponding to the physical behavior of the respectively used color, with regard to their consistency or viscosity, can be taken into account.
  • the development according to claim 42 makes it possible to ensure a uniform printing of a flat surface forming medium.
  • a more individual adaptation of the print heads to the surface of the medium to be printed or the printing table, in particular in a flat support surface for guiding the medium in the printing area, is achieved by the embodiment according to claim 45.
  • An advantage is also an embodiment according to claim 52, as this determines the movement of the nozzles of the printhead or the printhead assembly before producing a line of printing and thus the process, especially the movement of the nozzle or the printhead or the printhead assembly , can be controlled more sensitively.
  • this ink jet printing device supports a tape edge sensor and the medium roll on a roller bearing vertically and transversely to the feed device and leads, which is adjustable via the actuator in the axial direction, as thus flexible materials or materials that can not accommodate side guide pressure, accurate positioning can be ensured in the application area of the jet inkjet printing device.
  • this ink jet printing device supports a tape edge sensor and the medium roll on a roller bearing vertically and transversely to the feed device and leads, which is adjustable via the actuator in the axial direction, as thus flexible materials or materials that can not accommodate side guide pressure, accurate positioning can be ensured in the application area of the jet inkjet printing device.
  • a processing of substances is possible.
  • tape edge sensor is arranged in the region of the print head arrangement, or directly upstream thereof, since changes in the lateral position can be recognized in good time, as may affect this in the area of the printing device
  • a machine can be created with which a variety of flat media can be flexibly, rigidly, impermeably or porous processed.
  • the object of the present invention can also be achieved by the method according to claim 67.
  • an approach according to claim 68 or 69 is advantageous, since thereby the emergence of faulty groups or damage to the machine by different thickness media is avoided with certainty.
  • the method according to claim 70 makes it possible to process intrinsically stiff media which are substantially larger than the support or guide surface in the area of the inkjet printing device.
  • a preferred independent solution of the problem is also possible by the method according to claim 71. It is advantageous that the print quality can be achieved by monitoring the thickness in a simple manner.
  • the inkjet printing device or its nozzles in the integrity for a high quality, important distance above the surface of the to be printed Mediums are arranged. Damage caused by confusion of the medium to be introduced in the inkjet printing device can be avoided by the measures of claim 73.
  • the medium roll adjusted according to the measures in claim 74, as well as an exact lateral positioning of the medium is possible and is both in the longitudinal direction and in the transverse direction, a borderless printing of media possible.
  • a same print image even over media of great length can be achieved by the procedure of claim 77 and / or 78.
  • the ink-jet printing apparatus 10 has, on the one hand, a base body 12 which is fastened to a machine frame 11 and on which various rollers, which are described in more detail below, are mounted. Further, a printhead assembly 14 having a plurality of indicated printheads 16, mounted in a frame construction on the base body 12 and raised, so that the height of the printheads 16, for example, for printing differently thick media can be adapted in a suitable manner. In the embodiment shown is located both on the feed side (according to Fig.
  • a hinged mounted table 18 which is provided with a plurality of guide elements forming rollers 20 and further in its according to the folded-up position lower portion has a hinged portion 22 which is hinged about a hinged axis 24 upwards so that in the table 18, so to speak creates a window through which the ink jet printing apparatus 10 is also accessible from the supply and the withdrawal side.
  • Fig. 1 the two tables 18 are shown in a folded-up position, since, as will be explained in more detail below, a situation is shown in which the printing of a roll medium takes place. If, however, what with reference to the Fig.
  • the two tables 18 are pivoted to a horizontal position, so that by the tables 18, which can also be referred to as supports, a supply of plates can be done, even then if they are comparatively heavy, can be handled easily.
  • a medium roll 26 to recognize, which is stored in a manner to be explained below in a roller bearing.
  • the roll medium is first guided via a deflection roll 28 to a feed roll 30.
  • the medium 101 passes under a dancer roller 32, which is pivotably mounted via an arm 34.
  • a sensor 36 which cooperates with this in the manner explained below.
  • a so-called brake roller 38 Downstream of the dancer roller 32 is a so-called brake roller 38, which is therefore referred to as a brake roller 38, because it does not rotate in the transport direction, especially in the printing of flexible media, but opposite to this.
  • the side of the ink-jet printing apparatus 10 on which the medium roll 26 is disposed is also referred to as the medium supply side and the side of the ink-jet printing apparatus 10 opposite to the medium roll 26 as the medium discharge side and the discharge side, respectively become.
  • the counter-pressure roller can act with the associated roller as a transport or feed roller. This is particularly necessary for particularly heavy, plate-shaped media, which by a below, in the description of the Fig. 4 , belt drive described in more detail are no longer readily transportable.
  • the counter-pressure roller can thus be brought into engagement with a roller described as a transport roller, and provide for the required transport.
  • the counter-pressure roller can be pivoted out of engagement, for example, in a suitable position.
  • both above the feed roller 30 and the brake roller 38 a pivotally mounted counter-pressure roller 40 and 42 are arranged, where the medium 101 is pressed.
  • the paper is tensioned in the area of the dancer roller 32.
  • the inkjet printing device 10 makes it possible to use a separately controllable roller when printing comparatively less flexible paper as feed roller 30 in order to advance the paper at given times by a defined feed length.
  • the same roll i. the feed roller 30, which is operated when printing paper as a feed roller, not driven, but it stands still and thus acts as a guide device.
  • the flexible fabric is transferred from a transport roller 46 over the stationary roller, i. the feed roller 30, pulled and always kept tight or "ironed".
  • the stationary roller, i. the feed roller 30, are further operated so that it is rotated at a distance of, for example, a few minutes by a small angle, so that the wear of the feed roller 30 through the fabric which is drawn over this, takes place uniformly over the circumference of the roller.
  • the ink jet printing apparatus 10 of the present invention by providing a plurality of separately controllable rollers, it is possible to adjust the movement of the medium 101 to be printed by the ink jet printing apparatus 10 to different conditions in connection with different kinds of media, so that the ink jet printing apparatus 10 of the present invention is versatile can be used.
  • the inkjet printing device 10 according to the invention leads to the decisive advantage that different media can be printed with one and the same device, whereby the necessary changeover processes can be accomplished quickly. This thus allows operation of the user of the ink-jet printing apparatus 10 according to the invention, which advantageously meets today's requirements, since there is an increasing demand that a wide variety of media, such as e.g. in the field of advertising for one and the same project are required to print.
  • a tape feed 44 is arranged, which consists of several circumferential Bands 72, and its exact operation below in the detailed description of Fig. 4 is described.
  • a transport roller 46 Downstream of the described area of the printing heads 16 and the printing table 110 is a transport roller 46, which brings the medium 101 in the correct position with respect to the printing heads 16 in cooperation with a counterpressure roller 48 and this in particular via the braking roller 38 rotating in the opposite direction pulls to smooth it, and apply a defined voltage to the medium 101.
  • a counter-pressure roller 50 is provided above the transport roller 46, the counter-pressure roller 48, and laterally from the transport roller 46.
  • the upper counter-pressure roller 48 in cooperation with the transport roller 46, serves to transport plates in a horizontal direction, ie to the table 18 folded in this case in the horizontal position Fig. 1
  • a roll medium is to be printed, which in turn is roll on a roll 52 in the printed state, the lateral counter-pressure roller 50 is in engagement with the transport roller 46 and ensures the transport.
  • a cutter 54 Downstream of the transport roller 46 is a cutter 54, with the aid of which a roll medium can be cut to produce rollers 56 of smaller circumference than that of the medium roll 26 on the feed side of the ink jet printing apparatus 10.
  • smaller rollers 56 may be mounted in an upper region of the device.
  • the printed medium 101 is to be wound on a comparatively large roller 52 in the final state, it is stored in the ink jet printing apparatus 10 according to the invention in a lower region. From there, such a roller 52, which can not usually be handled and carried by a single operator, be removed from a loading and unloading device 58, the subject of Application WO 02/22478 the applicant.
  • the feed side accordinging to Fig.
  • the operation of the ink-jet printing apparatus 10 according to the invention in the printing of flexible media such as paper and synthetic fabrics works as follows.
  • the medium 101 is pulled substantially through the transport roller 46 via the printing table 110. It is useful here if the tape feed 44 with the, in the following in the detailed description of Fig. 4 , suction openings described at least for the plan holding the medium 101 was used. He can also support the feed or the medium 101.
  • the printing takes place each stripwise with a stripe width of for example 70 mm. Accordingly, the transport of the medium 101 must be intermittent.
  • the medium 101 is pulled by the transport roller 46 in cooperation with the counter-pressure roller 48, as described, on the counter-rotating brake roller 38, so that the medium 101 always remains taut. As a result, it further maintains its rigidity, and the distance of the medium 101 to the outlet surface of the printhead nozzles is kept constant, which is essential for ensuring a good printing result.
  • the feed roller 30 advances the medium 101 so far until the dancer roller 32 in the in Fig. 1 shown, reaches deep position, in which a arranged below the dancer roller 32 sensor 36 is actuated. This indicates that the required feed length has been reached, and a controller 120 stops the feed roller 30. Subsequently, the material for positioning for the next printing operation of the transport roller 46 is further pulled, so that the dancer roller 32 is raised. In the subsequent feed operation by the feed roller 30, the material is in turn advanced so far that the dancer roller 32 is lowered and abuts the sensor 36.
  • a roller which is operated in connection with certain media as a feed roller 30, with a dancer roller 32.
  • a dancer roller 32 is attached to an arm 34 which is pivotally mounted on the base body 12.
  • a dancer roller 32 is combined with a sensor 36 such that a lowered position of the dancer roller 32 caused by the feed is detected by the sensor 36 and generates a signal indicative of a defined feed length.
  • a transport roller 46 disposed downstream of the printing table 110 transports the medium 101 to the area of the printing heads.
  • This feed must be done in a defined manner so that the intermittently printed strips on the medium 101 are in a correct position relative to each other.
  • For the defined Feed is made in accordance with the described preferred embodiment of the invention in that subsequent to the transport of the medium 101, which biases the medium 101 and thus raises the dancer roller 32, a feed takes place, the bulge of the medium 101 down, inter alia, under the effect the gravity of the dancer roller 32 causes. This occurs until the bulge is sufficiently large, and the position of the dancer roller 32 is sufficiently deep, so that the medium 101 meets the described sensor 36, which subsequently detects and signals that the required feed length has been reached.
  • a control device 120 stops the feed roller 30 for this purpose.
  • a loop of the medium 101 is formed by the dancer roller 32, so that the medium 101 is advanced in the advancing direction 137 until a distance perpendicular to the guide surface 130 of the medium 101 corresponds to an extent of the subsequent, intermittent advancing movement of the medium 101 via the guide surface 130, whereupon the medium 101 is held on the side of the loop remote from the guide surface 130 and relative to the guide surface 130 in the longitudinal direction of the medium 101 by a presettable amount of the distance of the loop is moved forward.
  • Fig. 6 For example, a detail of the ink jet printing apparatus 10 is illustrated with an alternative embodiment of the sensor 36 associated with the dancer roller 32.
  • the medium to be printed 101 is passed under the dancer roller 32.
  • the medium 101 moves thereby from the feed roller 30 and the corresponding counter-pressure roller 40 coming under the dancer roller 32 and on via the brake roller 38 and the corresponding counter-pressure roller 42 in the direction of the printhead assembly 14 (FIG. Fig. 1 ), wherein the medium 101 by the dancer roller 32, which is movably mounted on the arm 34, is tensioned.
  • the determination of the exact feed length of the medium 101 is thereby signaled by the sensor 36, which is formed in this case as a light-optical sensor.
  • the sensor 36 is preferably formed by a photoelectric arrangement, wherein the radiation of one part of the sensor 36 is partially shielded by the sinking dancer roll 32 and the medium 101, which can be detected at a second part of the sensor by a photoelectric receiver.
  • the corresponding signals are used by a controller 120 to determine the required feed length of the medium 101.
  • Fig. 2 For example, the situation when printing on a flexible and porous medium 101, for example, cotton cloth used as a flag material is shown. Since this is a porous medium 101 through which the ink used for printing at least partially passes, care must be taken that the underlying printing table 110 is not contaminated.
  • an insertable ink absorber consisting of an ink absorbing pad 60 and two supporting edges 62 arranged laterally therefrom.
  • the Tintenabsorbtions worn is used in a, in the region of the receiving surface of the printing table 110 in a receiving device.
  • These supporting edges 62 are inserted into the printing table 110 and serve for the defined guidance of the medium 101 at a defined height above the printing table 110. Any ink which passes through the porous medium 101 is absorbed by the ink absorbing pad 60 extending across the printing table 110 ,
  • the ink-jet printing apparatus 10 e.g. also possible to provide a liftable and lowerable printing table 110.
  • the printing table 110 may be lowered to allow the insertion of an ink absorber provided in the ink jet printing apparatus 10 of the present invention.
  • the useable ink absorber makes the ink-jet printing apparatus 10 of the present invention flexibly usable because it can be used with ease in printing porous media such as cloths, thus ensuring safe and clean operation of the ink-jet printing apparatus 10.
  • impermeable media such as e.g.
  • the elevating and lowering press table 110 enables the rapid insertion of such an ink absorber and moreover ensures that the position of the press table 110 can also be adjusted according to the requirements of the type of medium 101 to be printed.
  • the printhead assembly 14 containing the printheads 16 must be slightly elevated, which is described in US Pat Fig. 2 is shown and can be seen by the fact that, for example, the feed roller 30 associated counter-pressure roller 40 in a relation to the situation of Fig. 1 is raised position.
  • the printheads are located also in the case that the medium to be printed 101, as in the case of cotton fabric, is pulled over the supporting edges 62, at a defined height above the medium 101 to be printed, so that the printing result can be secured in qualitative terms.
  • the printing table 110 may be formed lowered, which is provided according to the invention and also provides space for the insertion of the supporting edges 62 and the ink absorption pad 60.
  • the intermittent feed, in the printing of fabric, is again accomplished by the transport roller 46 through engagement with the platen roller 48, which pulls the media 101 over the brake drum 38.
  • the separately controllable feed roller 30 is not used in this case, however, before the advance of the medium 101, but stands still.
  • the medium 101 is pulled over the stationary feed roller 30, which causes a certain ironing effect.
  • the abrasion of the stationary in this case feed roller 30 is not carried out at a single point, this feed roller 30 is rotated at regular intervals by a few degrees, so that the abrasion is uniform over the circumference.
  • the ink-jet printing apparatus 10 can be used flexibly for different media due to the separate controllability and the separate operating possibilities of the individual rollers.
  • the ink absorbent pad 60 can be used together with the support edges 62 also in non-porous media when they are to be printed borderless, which necessarily leads to at least a slight over-edge spraying. Accordingly, the ink discharged over the edge can be sucked up by the ink absorbing pad 60, and the printing table 110 can be kept clean.
  • Fig. 3 It is shown how the ink-jet printing device 10 according to the invention can be converted for the printing of cardboard plates to a certain weight per unit area. Up to a certain basis weight, the feed of the cardboard plates namely by the tape feed 44, the exact operation of which is described below in the detailed description of Fig. 4 is described.
  • the tape feed 44 which is provided with a plurality of circumferential belts or belts 72, which transport the respective plate by advancing the belts or belts 72.
  • a foldable table 18 is provided on the medium supply and / or removal side, which has a foldable section 22 in its part closer to the print head arrangement 14.
  • a table 18 also unfolds its advantages on any printing device which does not necessarily have to have the features of the main claim.
  • the formation of a hinged table 18 on the medium supply and advantageously also on the media removal side causes the printing device is extremely flexible of roles on plate or sheet media convertible.
  • the table 18 does not interfere with the operation.
  • further advantages are obtained by the embodiment described, according to which the table 18 has a foldable section 22 in its region closer to the print head arrangement 14.
  • a lower portion 22 can be folded away, so that the portion of the inkjet printing apparatus 10, in which the printing takes place, is readily accessible.
  • the hinged portion 22 of the folding table 18 is formed so that it can be folded away upwards, so that the access to the interior of the inkjet printing apparatus 10 is not appreciably hampered.
  • rollers 20 offer the handling of especially heavy plates to be printed, the advantage that they can be easily fed to the inkjet printing device 10, so that it can also be used for the printing of such media.
  • the hinged portion 22 of the table 18 is hingedly attached to the body 12 at a location remote from the printhead assembly 14. This ensures that the hinged portion 22 can be effectively folded away from the printing device, so that access to this is affected as little as possible. In particular, the hinged portion 22 can be folded up on the folded-up table 18.
  • the table 18 and the hinged portion 22 For the safe operation of the table 18 and the hinged portion 22, it also offers advantages when the table 18 and / or the hinged portion 22 is lockable in a working and / or a rest position.
  • the working position of the tables 18 corresponds to the in Fig. 3 shown position, while the rest position of the tables 18 in the Fig. 1 and 2 is shown.
  • the table 18 and the hinged portion 22 respectively in a defined secure position, it being noted that the table 18 and the hinged portion 22 may also be formed such that their position by stops and / or by its own weight, for example, when folding over a top dead center, results.
  • the respective counter-pressure rollers 40, 42 and 48 of the associated feed 30, brake 38 and transport rollers 46 disengaged because the material transport in this case can be done exclusively by the tape feed 44.
  • the tape feed 44 may reach the limits of its performance, in other words too weak for further feed.
  • the platen rollers 40, 42, and 48 engage the heavy plate material and cooperate with the associated rollers, such as the feed roller 30, the brake roller 38, or the transport roller 46, to move the material.
  • the predetermined by the tables 18 guide plane 138 for the medium 101 is arranged substantially in alignment with the plane of the guide surface 130 of the printing table 110.
  • the guide plane 131 can also be slightly offset in height from the plane of the guide surface 130.
  • it is also advantageous that the guide plane 131 in the direction opposite to the feed direction 137 has a course approximately corresponding to the bending line of the medium 101, since thereby in relation to the length of the medium 101 short guide surface 130 in the inkjet printing device 10th , a kinking of the stiff medium 101 is prevented.
  • the two tables 18 can be seen in their unfolded state.
  • the tables 18 each have a plurality of rollers 20 which, in the case shown, are divided in three, as it were, along their axial extent, so that the individual sections of the rollers 20 are mounted on at least one side in one of the longitudinal struts 64.
  • a hinged portion 22 can be seen, in one of the printhead assembly 14 ( Fig. 3 ) Far region is hingedly mounted on a folding axis 24.
  • the folding movement of the hinged portion 22 is damped by a gas spring 70. It should be noted that the hinged portion 22 and / or the table 18 can be locked in total in one or both folding positions.
  • the tape feed 44 can be seen, which consists of several bands 72 or belt, in the case shown there are eight.
  • the bands 72 extend in suitable grooves, to which, for example, by the slots 74 shown from the bottom a negative pressure is applied.
  • suction openings 76 are also provided in the printing table 110 as such, which according to the invention can be operated independently of the openings 75 of the belts 72.
  • the tape feed 44 which consists of a preferred embodiment of a plurality of circumferential bands 72, which are each provided with openings 75, the medium 101 is sucked and kept flat during printing. Between the belts 72 or belts are also located in the pressure table 110 suction openings 76 that support the Planhalten the medium 101. As mentioned above, the apertures 75 of the belts 72 and the suction ports 76 of the printing table 110 can be operated with different negative pressure so that a different suction force is applied to the medium 101 in different areas and flexible media do not bend in a manner which could affect the quality of the print results.
  • the fixed suction openings 76 of the printing table 110 can be switched off, so that no unnecessary frictional force is applied to the transported medium 101 in this area, which would hinder the transport by the tape feed 44.
  • the openings 75 in the belts 72 and the suction ports 76 in the pressure table 110 are in communication with a vacuum system 77.
  • a feed device which has at least one band 72 which is provided with openings 75 and to which a negative pressure can be applied.
  • a tape feed 44 is formed, which is advantageous for certain media.
  • the specific embodiment of such a tape feed 44 may for example be provided such that in the printing table 110 a comparatively flat and wide groove is formed, in which an endless belt is guided.
  • the belt 72 has openings 75, and in the bottom of the groove, a connection to a vacuum system 77 is provided.
  • the belt 72 can be sealingly abutted on its sides and on its edge, air is drawn in from the vacuum system 77 through the openings 75 of the belt 72, so that an impermeable medium 101 to be transported is sucked by the belt 72 and when moving of the belt 72 can be transported.
  • a combination with a printing table 110 has proven to be particularly advantageous, which also has suction ports 76, which are, however, independently of the voltage applied to the tape feed 44 negative pressure supplied with negative pressure and adjustable in this regard.
  • suction can take place through the movable openings 75 of the band 72 and the fixed suction openings 76 of the printing table 110.
  • the fixed suction ports 76 of the printing table 110 may be turned off. As a result, the suction takes place only through the openings 75 of the band, i.
  • roller bearing which leads to smaller adaptations with respect to the edge of a roll medium and which, accordingly, can likewise be used independently of the other features according to the invention and taken as an object of the present application.
  • This roller bearing is characterized in that it is adjustable in the axial direction 105, and that it is associated with a belt edge sensor 104.
  • flexible media which are not necessarily exactly straight wound, or in which the quality of the winding has deteriorated during transport, the edges are trimmed such that the resulting, trimmed edge is present at a defined location. This leads to a considerable amount of time and avoidable material loss.
  • the edge of the roll media i.
  • the roller bearing is axially displaced such that the edge of the tape, i. the edge of the medium 101, again in the desired position.
  • conventional roll media may have a diameter of up to about 30 cm, it is preferred for this that the tape edge sensor 104 has a corresponding depth of field so that it is unwound both in a situation in which the medium 101 is unwound from a nearly completely filled medium roll 26, as well as in a situation in which the medium 101 is unwound from a nearly empty medium roll 26, can securely detect the position of the edge of the medium 101.
  • the medium roll 26 on both sides of a bearing dome 78, which on one side, according to Fig. 5 the right side, with a comparatively narrow wheel, for example, with a V-shaped circumferential profile is provided.
  • This narrow wheel engages in at least one provided with a suitable groove wheel 80 of the roller bearing.
  • a tape edge sensor 104 as part of a tape edge measuring device which always scans the position of the edge of the media 101 and generates a suitable signal when the edge of the media 101 has moved away from its desired position.
  • the 105 adjustable roller bearing is adjusted in a suitable manner, so that the band edge is returned to its desired position.
  • a medium 101 may be printed without trimming the edges as required by the prior art to bring them into the required position.
  • the wheel is on the other side the medium roll 26 slidably mounted in the axial direction 105 in the roller bearing.
  • the Fig. 13 shows a detail of the roller bearing for the medium roll 26, according to Fig. 5 , in perspective.
  • a control loop is provided for this purpose, which consists of the strip edge sensor 104 of a strip edge control 106 and an actuator 107. If a deviation from the desired edge of the medium 101 is detected by the belt edge sensor 104, then a signal is generated due to this deviation in the belt edge control 106, causing the actuator 107 to return the position of the media roll 26 in the preselected desired position.
  • the actuator 107 is designed so that it can move the roller bearing for the media roll 26 in the axial direction 105.
  • the determination of the position of the band edge, ie the edge of the medium 101 can be carried out with the aid of various measuring principles. Particularly advantageous is an embodiment of the tape edge sensor 104 with a measuring system formed of light barriers.
  • a measuring and transporting system which is also independent of all the above-described features of the ink-jet printing apparatus 10 according to the invention and provides advantages in printing apparatuses not covered by the claims.
  • the transport and measuring system is characterized in that both upstream and downstream of the printing table 110, a transport roller is present, each associated with a measuring device. And that is, as in Fig. 1 is shown, the brake drum 38, a measuring device 102 and the transport roller 46 is associated with a measuring device 103. In this way, the position of the material to be printed, ie the medium 101 both upstream and downstream of the printing table 110 and the print heads 16 can detect and control, resulting in the manner described below to very little waste.
  • the front edge of a medium to be printed 101 must be advanced until a downstream of the printing table 110 lying transport roller 46 with an associated measuring device 103 detects the front edge and thus can bring the material in a defined position.
  • the positioning of the material or the front edge is first taken by the upstream, ie "before" the printing table 110 and the printheads 16 lying brake roller 38 and the transport roller 46 associated measuring system.
  • the medium 101 is so long from the transport roller located upstream of the printing table 110, that is, the pushed forward until the front edge passes into the region of the transport roller 46 located downstream of the printing table 110.
  • the downstream transport roller 46 and the associated measuring system or the measuring device 103 takes over the transport and the regulation of the exact location of the medium 101.
  • these components can take over the transport and the position control until the rear edge of the medium 101 reaches the area of the printing table 110 and thus can likewise be printed almost without borders.
  • the signals of the two measuring devices 102, 103 are combined and adjusted with one another and, in particular, the "transfer" from the upstream system to the downstream system is undertaken.
  • the measurement of the feed distance can be done in a variety of ways. It is conceivable, for example, to attach marks to the medium to be printed 101 at a fixed distance from each other and to detect them by a suitable sensor. Furthermore, a specific pattern with recurring elements can be applied to the medium 101, so that on the basis of these recurring elements a detection of the feed distance can take place. Furthermore, this can be done using stochastic patterns, the z. B. be formed by the paper surface itself, carried out, wherein the detection takes place here together with a correlation measurement. In addition, the use of a measuring wheel or a measuring system with a drag clamp is possible.
  • the measuring devices 102 and 103 for measuring the feed path of the medium 101 by the application of color marks on the medium 101, which are visible only under special electromagnetic radiation, are performed.
  • the Fig. 7 to 9 show in simplified representations means of the inkjet printing apparatus 10 for adjusting the distances of the printheads 16 and the printhead assembly 14 from the medium to be printed 101.
  • the inkjet printing apparatus is formed so that the printhead 16 and the printhead assembly 14, a distance sensor 111th is appropriate.
  • This distance sensor 111 serves to measure a distance 112 between the top surface 113 of the medium 101 to be printed and an ink ejecting nozzle or nozzles 114 of the printhead assembly 14. Since both the printing table 110 and the printhead assembly 14 are liftable and lowerable, it is thus possible to use the ink jet To adapt printing device 10 very flexible and almost no additional conversion to different media to be printed 101.
  • the measured variable of the distance sensor 111 is used to regulate the distance 112 between the top 113 of the medium 101 and the nozzle or the nozzles 114 of the printhead assembly 14 at any time by means of a corresponding control device 120 to a required for proper operation setpoint 121 ,
  • the printheads 16 and the printhead assembly 14 are mounted in a holder 122, wherein this holder 122 in a height guide track 123 of a carriage 124 vertically or vertically to the top 113 of the medium 101 of height can be adjusted.
  • a lifting drive 125 which is controlled by the control device 120, actuated.
  • the holder 122 for the print heads 16 is thus adjustable via the lifting drive 125 along the height guide track 123.
  • the carriage 124 is in turn arranged on a transverse guideway 126 movable by an adjustment, so that the printhead assembly 14 can be moved laterally and parallel to the top 113 of the medium 101 on the top 113.
  • the support 122, the carriage 124 and the transverse guideway 126 with the lifting drive 125 together form a support 127 for the printhead assembly 14.
  • the support 127 is in turn arranged on a support guide 128 in the vertical direction movable on the machine frame 11 of the inkjet printing apparatus 10, wherein the vertical adjustment of the carrier 127 by a vertical adjusting device 129 which can be actuated by the control device 120 takes place.
  • the carrier 127 of the printhead assembly 14 is thus adjustable via a vertical adjusting device 129 at least approximately perpendicular to a guide surface 130 for the medium 101.
  • the pressure table 110 which can be vertically adjusted via a height guide 135, is also arranged, wherein the latter is adjustable at least approximately perpendicular to the guide surface 130 of the medium 101 or relative to the print head arrangement 14 via actuators 136.
  • Fig. 8 shows a detail of the inkjet printing apparatus 10 in a sectional view, according to Fig. 7 ,
  • the medium 101 to be printed lies on the guide surface 130 of the printing table 110.
  • the representation in Fig. 8 thus corresponds to a line of sight across the Feed direction 137 of the medium 101 and in the direction of movement of the carrier 127 and the printhead assembly 14 along the transverse guide path 126.
  • the distance 112 between the nozzles 114 and the top 113 of the medium 101 can be changed in several ways.
  • the height adjustment of the print head arrangements 114 is possible both by a vertical displacement of the holder 122 relative to the carriages 124 and by a vertical displacement of the carrier 127 on the carrier guide 128 fastened to the machine frame 11.
  • the printing table 110 is moved by the actuator 136 in its height relative to the base body 12.
  • the outlet openings 138 of the nozzles 114 are arranged opposite one another in a plane 139 of the upper side 113 of the medium 101 or the guide surface 130 of the printing table 110, wherein the plane 139 and the upper side 113 of the medium 101 are aligned as parallel as possible.
  • the Fig. 9 shows a detail of the inkjet printing apparatus 10 with the carriage 124 shown in section.
  • the print heads 16, in each of which a plurality of nozzles 114 are arranged, are in each case relative to the holder 122 by a Druckkopfhubantrieb 140 relatively adjustable. It can thus be achieved that, starting from a measurement of the respective individual distance 112 of each print head 16, the desired value 121 of the distance of the print head 16 from the upper side 113 of the medium 101 can be set. This is particularly advantageous if, as already described above, the feed devices ie the rollers described and / or the tape feed 44 are not sufficient to align the medium 101 on the guide surface 130 of the printing table 110 level.
  • the Fig. 10 shows a detail of the bracket 122 with a printhead 16 by multiple nozzles 114 are arranged.
  • the individual nozzles 114 are each formed with a nozzle actuator 141, so that the distance 112 of the outlet opening 138 of each nozzle 114 can be additionally adjusted by the control device 120.
  • the nozzle actuator 141 is formed by a micro-drive, for example a piezo drive.
  • a micro-drive nozzle actuator 141 is formed so that the nozzle 114 against the action of an elastically recoverable restoring element such as a spring or an elastically recoverable plastic, for example, a polyurethane ring is adjustable.
  • an elastically recoverable restoring element such as a spring or an elastically recoverable plastic, for example, a polyurethane ring
  • a plurality of nozzles 114 of a print head 16 is associated with a nozzle actuator 141, or a larger number of nozzles 114 are combined in a nozzle head 16 to nozzle groups and each of these nozzle groups is assigned a nozzle actuator 141.
  • the above-described means for changing the distance 112 between the outlet openings 138 of the nozzles 114 and the upper side 113 of the medium 101 to be printed together form an adjusting device wherein individual devices can be operated both manually and all together by the control device 120.
  • the adjusting means only from a part of the devices, such as the actuator 136 for the printing table 110, the vertical adjustment device 129 for the carrier 127, the lifting drive 125 for the holder 122, the Druckkopfhubantrieb 140 is formed for the print heads 16 and the nozzle actuator 141 for the nozzles 114.
  • the distance sensor 111 In order to determine the distance 112 between the upper side 113 of the medium 101 and the nozzle 114 or the nozzles of the printhead assembly 14 by the distance sensor 111, various known distance measuring methods can be used. For example, it is possible to measure the distance 112 by mechanically scanning the upper side 113 of the medium 101 to be printed. Particularly advantageous developments of the inkjet printing device 10, wherein the measurement of the distance 112 by means of acoustic, electrical or optical Distanzungsmeßmethoden is performed because there is no mechanical contact between the distance sensor 111 and the top 113 of the medium to be printed 101, thereby blurring the still wet ink or ink can be excluded.
  • the distance sensor 111 may be formed, for example, as a reflection light transmitter or as a rangefinder with an electro-optical receiving element.
  • an already applied color point is used for measuring the distance 112, in which a light beam is directed to this color point and the distance 112, between a nozzle 114 of the ink jet printing device 10 and the light reflected from this color point this facing top 113 of the medium 101 is determined.
  • the distance sensor 111 is formed at least in two parts and consists of a transmitting device 142 and a receiving device 143.
  • the transmitting device 142 and the receiving device 143 are both attached to the print head assembly 14.
  • the transmitting means 142 and the receiving means 143 are useful on the printheads 16th or attached to the nozzles 114.
  • measuring methods for the distance sensor 111 are also conceivable in which one of the parts, ie the transmitting device 142 or the receiving device 143, is arranged on the print head arrangement 14 and / or on the print head 16 and / or on the nozzle 114 during the process Accordingly, other part, ie the receiving device 143 or the transmitting device 142, is arranged on the printing table 110.
  • the distance sensor 111 may also be attached to the side of the printhead assembly 14 or it is possible that on both sides of the printhead assembly 14, ie, respectively on both sides of the in or against the movement of the printhead assembly 14, along the transverse guideway 126 corresponding direction , are directed, in each case a distance sensor 111 is attached.
  • the printheads 16 are each a distance sensor 111, in the feed direction, according to the direction of the transverse guideway 126, respectively, upstream, which offers the advantage that the local distance 112 can be recorded in a sense temporally anticipatory.
  • the distance sensor 111 in Fig.
  • this arrangement provides the distance sensor 111 also has the advantage that when feeding the medium 101, corresponding to the feed direction 137 of the distance sensor 111 can be used simultaneously for detecting a transversely to the feed direction 137 extending end edge of the medium 101. This makes it possible to prevent that when feeding a medium 101, the material thickness 115 is greater than the distance between the outlet opening 138, the nozzles 114 and the guide surface 130 of the table 110, the nozzles 114 of the printhead assembly are damaged.
  • control device (120) is designed to issue an error message, which takes place as soon as the sensor detects the upper side (113) of the medium (101) and the distance (112) does not correspond to the desired value (121), in particular is greater than the desired value ( 121).
  • the distance sensor 111 is attached to the printhead assembly 14.
  • each of the printheads 16 has its own distance sensor 111 as in Fig. 9 shown on each nozzle 114 as in Fig. 10 arranged to arrange. This has the advantage that, in cooperation with the control device 120, an individual adaptation of the distance 112 for the nozzle heads 16 and also for the nozzles 114 is possible.
  • a distance sensor 111 is arranged on the printing table 110.
  • the distance sensor 111 together with a transmission path and an evaluation unit or a Meßwertumsetzer a Distanzmeßvorraum.
  • the evaluation unit or the measured value converter is preferably arranged in the control device 120.
  • the distance sensor 111 and the distance measuring device are thus connected to the control device 120, which in turn is connected to the above-described elements of the adjusting device.
  • By the distance measuring the actual value of the distance 112 is determined and compared in the control device 120 with a predetermined or adjustable setpoint value 121.
  • the difference between the actual value of the distance 112 and the desired value 121 determined by the control device 120 then forms the basis for reducing this difference by driving the various elements of the adjusting device of the inkjet printing device 10.
  • the inkjet printing device 10 is designed such that is detected by the distance measuring device, the actual value of the distance 112 continuously during the application of the ink with the printhead assembly 14 on the medium 101.
  • the control device 120 for reducing the difference between the setpoint value 121 and the actual value of the distance 112 during the application of the ink to the medium 101 is preferably constantly or even before the beginning of the application the color of the color with the printhead assembly 14 on the medium 101 activated.
  • setting devices are formed on the control device 120.
  • the control device 120 comprises an electronic computer, in particular a computer, wherein the specification of the desired value 121 can be made via a corresponding input keyboard of the computer.
  • this specification of the setpoint value 121 is carried out in the computer of the control device 120 program-controlled, to which other parameters which are essential for the printing process, such as e.g. the quality of the used inks or the surface condition of the medium 101 are automatically detected by the program or entered manually via the input keyboard of the computer.
  • the print head arrangement 14 in its relative position perpendicular to the plane of the support and / or guide surface 130, to have a distance 112 of 0.1 to 15 mm, preferably 0.5 to 10 mm, in a printing position for printing the medium 101 to position.
  • the Figures 11 and 12 show details of the arrangement of the platen roller 40 and the feed roller 30th
  • Fig. 11 is a detail of the feed roller 30 and the platen roller 40, according to Fig. 3 represented.
  • the medium 101 lies on the feed roller 30, wherein a situation is shown in which the medium 101 is slightly deformed, as may be the case, for example, in a self-rigid medium 101 such as a cardboard or plastic plate.
  • a plurality of counter-pressure rollers 40 are formed, which are movably supported in a roller frame 144, relative to this roller frame 144, in the vertical direction.
  • the roller frame 144 can be raised and lowered by the counter-pressure rollers 40 in a vertical direction, that is to say in a direction perpendicular to the guide surface 130.
  • the counter-pressure rollers 40 can be brought by lowering the roller frame 144 to the upper side 113 of the medium 101, so that they rest on the upper side 113 and adapt to the slightly curved shape of this upper side 113 of the medium 101.
  • the Fig. 12 shows a detail of the arrangement of the platen rollers 40 and the feed roller 30, according to Fig. 11 in a cutaway view.
  • Each counter-pressure roller 40 is rotatably mounted on an arm 145 and is supported by a resiliently acting return element 146, such as a spring, against the roller frame 144. If now the roller frame 144 with the counter-pressure rollers 40 with a predefined force on the upper side 113 of the medium 101, the return elements 146 are compressed accordingly.
  • the in the Fig. 11 and 12 The arrangement described thus has the function of a distance measuring device, as it is also realized by the distance sensor 111 and can be used in combination with the distance measuring device 111 formed with a distance sensor as well as alternatively.
  • a separate arrangement of the feed roller 30 and the platen roller 40 of rollers it is also possible to use on the ink-jet printing apparatus 10, a separate arrangement of the feed roller 30 and the platen roller 40 of rollers, as a distance measuring device of the type described.
  • the media 101 when feeding plate-shaped media 101 of greater material thickness 115, the media 101 can not be introduced into the printhead assembly 14 without the material thickness 115 being registered by a monitor and the printhead assembly 14 being moved vertically by the controller 120 and so the setpoint 121 can be specified.
  • a corresponding monitoring device in cooperation with the control device 120 prevents the medium 101 from being fed into the area of the printhead assembly 14 in which printing can be erroneously initiated.
  • a lateral guide track 150 is associated with the longitudinal side edge 151 of the medium 101.
  • This lateral guideway 150 may be fixedly secured from a plurality of rollers 152 which are arranged at a distance from each other in the longitudinal direction of the medium 101 and which may be fastened fixedly on a housing part 153 which can be adjusted transversely to the direction of advance 137.
  • these rollers 152 are made of a pressure-resistant material, so that the side guideway 150 represents an exact direction and side boundary for the medium 101.
  • the side guideway 150 may prove advantageous to align them exactly on the side guideway 150 consecutively.
  • This may, in turn, consist of a plurality of rollers 152 arranged in alignment with one another, each individual roller 152 or groups of rollers 152 or the entire lateral guide track 155 transverse to the feed direction 137 against the action of means 165, for example springs, elastically biased in the direction of the opposite lateral guide track 150 , be stored adjustable.
  • the rollers 157 of the side guideway 155 may also be dimensionally stable or hard, for example, formed by outer rings of ball bearings. But it is also possible to form the elastically biased means 156, characterized in that the rollers 157 are adjusted roughly adjustable on a housing part and the rollers 157 are elastic in itself, for example, from an elastically yieldable plastic or rubber material, such as polyurethane exist.
  • the reference edge of the medium 101 always abuts against the longitudinal side edge 151 backlash on the side leading edge 150 and width tolerances can be compensated by the deformation of the rollers 157 and the deformation of the spring.
  • a biasing force can be adjusted in the direction of the lateral guideway 150, with appropriate default, so that even at researchingunterschreitung the width of a safe investment of the reference edge of the medium 101 is ensured on the side guideway 150.
  • the ink jet printing apparatus 10 of the present invention it is possible to realize a method of printing different media by ink-jet printing in which the medium 101 is placed in the area of an ink-jet printing apparatus and from the digital data of a digitally stored image such as the position, intensity and / or color of a plurality of color dots, a reproduction of this image is produced by using the ink jet printing apparatus according to any one of claims 1 to 66, a substantially intrinsically rigid plate-shaped medium 101, optionally after detecting its Material thickness 115, relative to a planar bearing or guide surface 130 in the area of an ink jet printing device spent and then a plurality of arranged in a plane parallel to the upper surface 113 of the medium 101 plane 139 nozzles 114 transverse to the feed direction 137 of the M ediums 101 moves relative to this over the entire printing width and at the same time a plurality of lines of color dots in the feed direction 137th of the medium 101 are applied successively, whereupon the nozzles 114 are
  • the substantially inherently rigid, plate-shaped medium 101 is also supported and / or guided at least over part of its length in the feed direction 137 before and optionally after the support or guide surface 130 in approximately the same plane by guide elements fixed relative to the medium 101.
  • an ink-jet printing device 10 in particular a method for printing different media for digitally stored images can be realized.
  • a digital data of a digitally stored image such as the position, intensity and / or color of an abundance of color dots
  • a reproduction of an image is made, an actual value of the distance 112 between the printhead assembly (s) 114 the inkjet printing device and a surface of the medium 101 and / or the guide surface 130 and / or the belt edge of the medium 101 facing the nozzles 114, and a presettable setpoint value 121 of the distance 112 and / or the position of the medium roll 26 transversely to the feed direction 137 of the medium 101 is specified relative to the base body.
  • the ink jet printing apparatus reaches an actual value of the distance 112 between the printhead arrangement or the printheads or the nozzles 114 of the inkjet jet, which corresponds to the presettable setpoint value 121 of the distance 112. Printing device and a nozzle 114 facing surface of the medium 101 and / or the guide surface 130 is adjusted.
  • At least one of the inkjet printing device upstream and / or upstream counter-pressure roller and / or the distance measuring device at least before the supply of the medium 101 in the region of the printhead assembly to an actual value of the distance 112 between the printhead arrangement or the printheads or the nozzles 114 of the inkjet printing apparatus and a surface of the medium 101 and / or the guide surface 130 facing the nozzles 114, which corresponds to the presettable target value 121 of the distance 112 and it is determined whether the surface of the medium 101 is located at a distance 112 from the surface of the medium 101 facing the nozzles 114 and / or the guide surface 130, which deviates from the desired value 121.
  • roller bearing for the medium roll 26 with the actuator 107 in the axial direction 105 is moved transversely to the feed device such that the band edge of the medium 101 in the printhead assembly in the setpoint is located and that the actual value of the band edge in the printhead arrangement or this is determined immediately upstream.
  • the quality of the images produced with an inkjet printing device according to the invention can be improved in particular by the distance 112 between at least one nozzle 114 of the inkjet printing device and the medium 101 and / or the position of the medium roll 26 continuously during the application of the color Printhead assembly is determined and that the difference between the setpoint and the actual value of the distance 112 and / or the position of the medium roll 26 is detected during the application of the color.
  • Control device 120 Due to the fact that the distance 112 in the direction of movement of the nozzles 114 of the print head and / or of the medium 101 is detected upstream of the nozzles 114 at a presettable distance, it is possible to pre-record profiles of the top side 113 of the medium 101 with a clear temporal advantage Control device 120 significantly reduce the requirements for their speed.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Ink Jet (AREA)
  • Handling Of Sheets (AREA)
  • Handling Of Cut Paper (AREA)
  • Particle Formation And Scattering Control In Inkjet Printers (AREA)
EP01976229.3A 2000-09-15 2001-09-17 Tintenstrahl-druckvorrichtung Expired - Lifetime EP1317342B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
ITBZ000037 2000-09-15
IT2000BZ000037A IT1316139B1 (it) 2000-09-15 2000-09-15 Dispositivo di stampa a getto di inchiostro.
PCT/EP2001/010732 WO2002022362A2 (de) 2000-09-15 2001-09-17 Tintenstrahl-druckvorrichtung

Publications (2)

Publication Number Publication Date
EP1317342A2 EP1317342A2 (de) 2003-06-11
EP1317342B1 true EP1317342B1 (de) 2014-04-23

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EP01976229.3A Expired - Lifetime EP1317342B1 (de) 2000-09-15 2001-09-17 Tintenstrahl-druckvorrichtung

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US (1) US20040017456A1 (it)
EP (1) EP1317342B1 (it)
JP (1) JP5006501B2 (it)
AU (2) AU2001240492A1 (it)
ES (1) ES2479190T3 (it)
IT (1) IT1316139B1 (it)
WO (2) WO2002022368A1 (it)

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WO2002022362A2 (de) 2002-03-21
US20040017456A1 (en) 2004-01-29
IT1316139B1 (it) 2003-03-28
WO2002022362A3 (de) 2003-01-16
WO2002022368A1 (de) 2002-03-21
EP1317342A2 (de) 2003-06-11
JP5006501B2 (ja) 2012-08-22
AU2001240492A1 (en) 2002-03-26
ITBZ20000037A0 (it) 2000-09-15
JP2004508972A (ja) 2004-03-25
ITBZ20000037A1 (it) 2002-03-15
AU2001295568A1 (en) 2002-03-26
ES2479190T3 (es) 2014-07-23

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