EP0583622B1 - Imprimante thermique à transfert - Google Patents
Imprimante thermique à transfert Download PDFInfo
- Publication number
- EP0583622B1 EP0583622B1 EP93111406A EP93111406A EP0583622B1 EP 0583622 B1 EP0583622 B1 EP 0583622B1 EP 93111406 A EP93111406 A EP 93111406A EP 93111406 A EP93111406 A EP 93111406A EP 0583622 B1 EP0583622 B1 EP 0583622B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- thermal transfer
- printing
- printing heads
- recording medium
- 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
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/315—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material
- B41J2/32—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material using thermal heads
- B41J2/325—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material using thermal heads by selective transfer of ink from ink carrier, e.g. from ink ribbon or sheet
-
- G—PHYSICS
- G07—CHECKING-DEVICES
- G07B—TICKET-ISSUING APPARATUS; FARE-REGISTERING APPARATUS; FRANKING APPARATUS
- G07B17/00—Franking apparatus
- G07B17/00459—Details relating to mailpieces in a franking system
- G07B17/00508—Printing or attaching on mailpieces
-
- G—PHYSICS
- G07—CHECKING-DEVICES
- G07B—TICKET-ISSUING APPARATUS; FARE-REGISTERING APPARATUS; FRANKING APPARATUS
- G07B17/00—Franking apparatus
- G07B17/00459—Details relating to mailpieces in a franking system
- G07B17/00467—Transporting mailpieces
-
- G—PHYSICS
- G07—CHECKING-DEVICES
- G07B—TICKET-ISSUING APPARATUS; FARE-REGISTERING APPARATUS; FRANKING APPARATUS
- G07B17/00—Franking apparatus
- G07B17/00459—Details relating to mailpieces in a franking system
- G07B17/00508—Printing or attaching on mailpieces
- G07B2017/00516—Details of printing apparatus
- G07B2017/00524—Printheads
- G07B2017/0054—Thermal printhead
-
- G—PHYSICS
- G07—CHECKING-DEVICES
- G07B—TICKET-ISSUING APPARATUS; FARE-REGISTERING APPARATUS; FRANKING APPARATUS
- G07B17/00—Franking apparatus
- G07B17/00459—Details relating to mailpieces in a franking system
- G07B17/00508—Printing or attaching on mailpieces
- G07B2017/00637—Special printing techniques, e.g. interlacing
Definitions
- the invention relates to a thermal transfer printing device for a postage stamp printer, with two printing stations at which a record carrier can be printed in a grid pattern during a transport movement in order to produce a print image composed of these prints from columns lying transversely to the transport direction.
- a printing device of this type is e.g. B. from US Pat. No. 4,580,144.
- the print image of a postage stamp is composed of two partial prints, which can increase the printing speed for the overall stamp.
- a constant amount of information is printed on an envelope at one printing station and a variable amount of information predetermined by electronic data processing is printed on an envelope at the other printing station. If the correct print sequence and assignment are observed between these two printing processes a composite print image results from the constant and the variable print share.
- the increased printing speed is possible by dispensing with a special electronic control for printing the constant information and by using a printing device for this purpose which has a pictorial form corresponding to this information.
- the variable information is fed electronically to a thermal transfer print head. The time required for printing can be reduced by a faster operation of the printing device for the constant information.
- the invention solves this problem for a thermal transfer printing device of the type mentioned above in that two identical thermal transfer print heads, each of which generates the columns of the printed image at a mutual spacing of an integer multiple of the raster division, under control of a control device two by one raster division in the transport direction Print raster images offset against each other, each with a column spacing equal to twice the grid pitch.
- the invention provides that the two print heads always print only the next but one column of the composite print image, the two raster images thus produced, each having half the resolution of the composite print image, being inserted into one another due to the mutual offset in the transport direction by one raster division. Since each print head supplies only half of all required columns for a print image, the print speed can be doubled.
- two identical print heads are provided, each of which allows variable control, so that correspondingly variable images composed of the print points of the two print heads can be printed.
- the control unit takes into account the Distance between the two printheads, the associated print data is ready and activates the printheads.
- the print heads are preferably arranged in such a way that they face a common counter-pressure element at approximately the same inclination angles, which are opposite to the surface normal of the record carrier, and each have print elements located next to one another on the record carrier in the direction of the columns.
- the opposite inclination of the two printheads allows the smallest possible distance between their print bars, which minimizes image errors due to imprecise mutual alignment and speed fluctuations in the movement of the recording medium.
- the control device preferably has a central control unit which selects coded print data stored in a memory for the two print heads, supplies them in addition to control signals and activates the print heads as a function of the respective position of the recording medium determined by a displacement sensor.
- a displacement transducer By using a displacement transducer, a fixed association between print data and the respective print position is achieved, which is independent of fluctuations in the transport speed.
- the printing device is the mutual distance between the columns generated by the two printheads, an odd multiple of the raster division, both printheads being activated by two raster divisions after changes in position. In order to ensure a uniform energy consumption, it can be provided that the two printheads are not activated simultaneously, but in succession.
- the mutual spacing of the columns generated by the two printheads is selected to be equal to the even multiple of the raster division, with one of the two printheads being activated alternately after changes in position by one raster division. A more even energy consumption is inherent.
- the print heads are offset in the direction of their print bars by half a print element distance. This results in an optimal resolution of the print image generated.
- a thermal transfer printing device which has a counter pressure roller 1 as a counter pressure element and two thermal transfer print heads 2 and 3 as essential components in the printing area. Between the counter-pressure roller 1, which can be rotated in the direction of the arrow, and the two print heads 2 and 3, there is a recording medium 4 which is transported in the direction of the arrow and over which a thermal transfer ink ribbon 5 is guided in the direction of the arrow in the printing area.
- the two print heads 2 and 3 have at their lower edge in Fig. 1 a print bar 2 'or 3', which rests on the ink ribbon 5 and, depending on the control of the individual electrodes present in the print bar, the selective transfer of the heat of dissolved paint from the Ribbon 5 on the recording medium 4 causes.
- the opposite inclination of the two printheads 2 and 3 to the surface normal of the recording medium 4 shown in FIG. 1 ensures that their print bars 2 'and 3' are arranged directly next to one another.
- the two print heads 2 and 3 have approximately identical inclination angles. It can be seen that due to the opposite inclination, a very small distance between the two pressure bars 2 'and 3' is possible, whereby two printing stations are realized which are very close to each other in a single printing area. As a result, image errors are kept to a minimum by imprecise mutual alignment of the pressure bars 2 'and 3' and by speed fluctuations in the paper transport.
- the two print heads 2 and 3 can generate a print image on the recording medium 4, which is composed of print dots which are generated successively or simultaneously by both print heads 2 and 3. If each of the two print heads generates only half the total number of dots required, the print image is generated with twice the value of the print speed possible for a print head 2 or 3.
- FIG. 2 shows how such a print image is composed of the print dots of the two print heads.
- part of an envelope 10 is shown in a plan view while it is in the direction of the arrow is moved past the printing area.
- the print head 2 and the print head 3 print pressure points on the envelope 10 by selectively actuating their printing electrodes, by means of which a postage stamp 11 is generated.
- This postage stamp 11 has already been completed with one half 12 at the time in FIG. 2.
- the print head 3 will fill the gaps between the print dots previously created with the print head 2 and complete the print image in this way, while the print head 2 is no longer activated after reaching the left end of the postage stamp.
- the print image is composed of the print dots generated with the two print heads 2 and 3.
- the time required for this is half as long as the time required to produce a print image of the same resolution with only one print head.
- the two print heads 2 and 3 are operated by a control device 13 which, according to FIG. 3, has as its essential components a central control unit 14 to be started by a print request signal 13 and a data memory 15.
- a correspondingly prepared microcontroller is provided as the central control unit 14, which selects the print information containing the image information in binary coded form and is stored in the data memory under program control and transmits it to the two print heads 2 and 3.
- the central control unit uses 14 address words to select the respective print data applied to the data memory 15 via address lines 16 and the associated print data read out via data lines 17.
- the print data are then forwarded unchanged, for example, to the two print heads 2 and 3 via data lines 16 'and 17', where they are buffered until the two print heads 2 and 3 are activated.
- the control unit can also be used, for example, to monitor and control the transport, which is preferably carried out step by step.
- Each address stands for a specific column to be printed and the associated print data contain, in coded form, which of the individual electrodes are to be actuated in the respective print head 2 or 3.
- the addresses are selected, a fixed sequence is specified, the distance between the two print heads 2 and 3 from one another being taken into account by a corresponding, mutual displacement of the addresses assigned to them by a constant value. Assuming a constant transport speed of the recording medium 4, the activation of the print heads 2 and 3 can then take place at certain time intervals predetermined by the desired grid division and the transport speed.
- the current position of the recording medium 4 is determined instead by means of a displacement sensor 18 by measuring the distance already traveled by the recording medium 4 and the actual position thereof from the central control unit 14 determined with regard to printheads 2 and 3.
- the corresponding printhead 2 or 3 fed from a supply unit 19 is then activated by the central control unit 14 via control lines 20 or 21.
- FIG. 4 The formation of such a print image when using printheads at an interval of an odd multiple of the raster division is shown in FIG. 4.
- the distance between the two longitudinal axes of the print bars 2 'and 3' is three times a given raster division 22.
- the recording medium becomes from the left moved to the right past the pressure bars 2 'and 3' indicated by dash-dotted lines in the drawing. If the position a) for printing the first column is reached, a printing element of the printing bar 2 'is actuated in accordance with the printing date stored under the associated address, which consequently leaves a corresponding printing point on the recording medium 4.
- the print bar 3 ' is not activated at this position, since no data word can yet be assigned.
- the third column is printed by the print bar 2 '.
- a print request is first waited for after the printing device has been started up. After this has been done, various measures for printing preparation such.
- the data word stored under the start address is then transferred to print head 2.
- the address to be assigned to the print head 3 is then derived from this address and the associated data word is transferred to the print head 3.
- the printing process is initiated, ie both print heads 2 and 3 are activated.
- the next address is then determined, for example, by increasing a counter reading for the print head 2. If this is equal to a given end address, printing is ended and another print request is awaited. Otherwise, the new address put in the place of the start address and the process described above is repeated until the end address is reached.
- FIG. 6 shows the formation of the print image according to FIG. 4 for the case that the print heads 2 and 3 are separated from one another by a double, that is to say an even-numbered multiple of the grid division.
- the record carrier 4 is in turn moved from left to right past the pressure bars 2 'and 3' indicated by dash-dotted lines in the drawing.
- the printing of the first column with a pressure point takes place at position a) by the print head 2, which also generates the third column with three pressure points after the recording medium 4 has moved by two raster divisions 22.
- the print head 3 has no print data available until the position c) which is further away by a raster graduation 22 is reached, so that it is only activated at position c) and prints the second column comprising two pressure points.
- print bars 2 'or 3' are then alternately activated. This means that the fifth column is printed next by the print bar 2 '(position d)) and subsequently the fourth column by the print bar 3' and so on.
- the associated flow chart is shown in FIG. 7.
- a print request is again waited for and, after this has been done, the print is prepared, for example by starting the transport mechanism.
- the start address to be assigned to print head 2 is set and the displacement transducer is calibrated.
- the data word stored under the start address is then transmitted to the print head 2, the print head 2 is reached when the print position is reached, and the print head 2 is then activated.
- the address for the print head 3 is calculated from the address intended for the print head 2 by addition with a constant value corresponding to the print head spacing, the associated data word is transferred to the print head 3 and this is activated when its print position is reached.
- the next address of the print head 2 is then determined, for example, by increasing a counter reading. If this is equal to a given end address, printing is terminated and another print request is awaited. Otherwise, this new address is put in the place of the start address and the process described above is repeated until the end address is reached.
- the last-mentioned printing process has the advantage over the former that, due to the principle, both print heads 2 and 3 are not activated at the same time, but alternately one after the other. In this way, load peaks are avoided and a more uniform energy consumption is achieved, which allows a smaller dimensioning of the supply unit feeding the two print heads 2 and 3.
- the print heads 2 and 3 are activated one after the other at the common printing position by the control device delaying the control signal for the print head 3 for so long. until the printing process of the print head 2 is completed with certainty.
- the printing speed in a thermal transfer printing device according to the invention can be doubled compared to devices with only one print head, with a maximum of flexibility being offered, since all parameters determining the print image are predetermined by the control device and therefore changes are simple and in any Way z. B. can be carried out by means of a data processing device. Since each printhead only prints the line after the next one, in addition to increasing the print speed, it is also possible to generate print images of any length in the direction of transport, with the appropriate data storage capacity. In the event of a print head failure, it is also ensured that a recognizable print image is nevertheless produced, since the print head which is still functioning continues to generate a half-resolution raster image. Thus, in the case of a postage stamp printer with a printing device according to the invention, it can still be determined after such a fault whether the postage fee has been paid.
- the resolution of the printed images can be increased without apparatus changes by reducing the printing speed and reducing the column spacing, which can be easily achieved by changing the corresponding parameters in the control device. If an optimal resolution is sought, it can also be provided that the printing elements of the two printheads are displaced in the direction of their printing strips by half a printing element distance.
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- Engineering & Computer Science (AREA)
- Computer Security & Cryptography (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Electronic Switches (AREA)
- Printers Characterized By Their Purpose (AREA)
Claims (7)
- Dispositif d'impression par transfert thermique pour une imprimante de cachets de valeur,
avec deux points d'impression au niveau desquels un support d'impression peut être imprimé suivant une matrice de points pendant une course de transport aux fins de produire une image imprimée composite formée de colonnes disposées perpendiculairement à la direction de transport,
caractérisé par le fait que deux têtes (2, 3) d'impression par transfert thermique identiques qui produisent les colonnes de l'image imprimée avec un espacement entre elles correspondant à un multiple entier de la division de la matrice et sont commandées par un dispositif de commande (14, 15) impriment deux images en matrice de points qui sont décalées l'une par rapport à l'autre de la valeur d'un division de la matrice dans la direction de transport, avec un espacement entre colonnes qui est égal au double de la division de la matrice. - Dispositif d'impression par transfert thermique selon la revendication 1, caractérisé par le fait que les têtes d'impression (2, 3) par transfert thermique sont disposées en vis-à-vis d'un élément (1) commun de contre-appui en formant des angles opposés sensiblement égaux avec la normale au plan du support d'impression et comportent, au niveau du support d'impression (4), des éléments d'impression qui sont disposés côte à côte dans la direction des colonnes .
- Dispositif d'impression par transfert thermique selon la revendication 1 ou la revendication 2, caractérisé par le fait que dans le dispositif de commande (14, 15), une unité (14) de commande centrale sélectionne des données codées pour les têtes d'impression (2, 3) stockées qui sont dans une mémoire de données (15), envoie ces données aux têtes d'impression (2, 3) et active ces dernières (2, 3) en fonction de la position du support d'impression (4) déterminée par un capteur de course (18).
- Dispositif d'impression par transfert thermique selon l'une des revendications 1 à 3, caractérisé par le fait que l'espacement entre les colonnes produites par les deux têtes d'impression (2, 3) est égal à un multiple impair de la division de la matrice et par le fait qu'après des changements de position du support d'impression (4) correspondant à deux divisions de la matrice les deux têtes d'impression (2, 3) sont activées.
- Dispositif d'impression par transfert thermique selon l'une des revendications 1 à 3, caractérisé par le fait que l'espacement entre les colonnes produites par les deux têtes d'impression (2, 3) est égal à un multiple pair de la division de la matrice et par le fait qu'après des changements de position du support d'impression (4) correspondant à une division de la matrice les deux têtes d'impression (2, 3) sont activées à tour de rôle.
- Dispositif d'impression par transfert thermique selon la revendication 4, caractérisé par le fait que les deux têtes d'impression (2, 3) sont activées l'une après l'autre.
- Dispositif d'impression par transfert thermique selon l'une des revendications 1 à 6, caractérisé par le fait que les têtes d'impression (2, 3) sont décalées l'une par rapport à l'autre, dans la direction de leurs plaquettes d'impression (2', 3'), de la moitié de la valeur de l'espace entre les éléments d'impression .
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4227596 | 1992-08-20 | ||
DE4227596A DE4227596A1 (de) | 1992-08-20 | 1992-08-20 | Thermo-Transfer-Druckeinrichtung |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0583622A1 EP0583622A1 (fr) | 1994-02-23 |
EP0583622B1 true EP0583622B1 (fr) | 1996-03-13 |
Family
ID=6465980
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP93111406A Expired - Lifetime EP0583622B1 (fr) | 1992-08-20 | 1993-07-15 | Imprimante thermique à transfert |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0583622B1 (fr) |
DE (2) | DE4227596A1 (fr) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4312231C2 (de) * | 1993-04-14 | 2002-01-31 | Bilfinger Berger Bau | Verfahren und Vorrichtung zur Herstellung von flächigen Bauelementen im Boden |
DE19607838C2 (de) * | 1996-03-01 | 2000-03-23 | Gudrun Sobel | Verfahren zum Herstellen von bedruckten Beuteln |
DE10041843A1 (de) * | 2000-08-25 | 2002-03-14 | Rena Informationstech Gmbh | Drucker mit mehreren Druckköpfen |
DE20208286U1 (de) * | 2002-05-28 | 2003-01-16 | Kruschat Gerno | Tragbares Beschriftungsgerät |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3104351A1 (de) * | 1981-02-07 | 1982-09-09 | Avery International Corp. (n.d.Ges.d.Staates Delaware), 91108 San Marino, Calif. | Schreibwerk fuer einen etikettendrucker |
JPH0764085B2 (ja) * | 1981-06-08 | 1995-07-12 | 富士ゼロックス株式会社 | 感熱記録装置 |
JPS61246067A (ja) * | 1985-04-25 | 1986-11-01 | Rohm Co Ltd | サ−マルプリント方式 |
CH675560A5 (fr) * | 1987-01-06 | 1990-10-15 | Pitney Bowes Inc | |
GB2208367B (en) * | 1987-07-09 | 1991-07-03 | Alcatel Business Systems | Franking machine |
FR2642004B1 (fr) * | 1988-12-30 | 1995-02-03 | Oce Graphics France | Imprimante thermique grande largeur |
JPH03138161A (ja) * | 1989-10-25 | 1991-06-12 | Mutoh Ind Ltd | サーマル記録装置 |
GB2249996A (en) * | 1990-11-22 | 1992-05-27 | Alcatel Business Systems | Selection routine for energising print elements of a thermal printhead |
JPH06237172A (ja) * | 1993-02-10 | 1994-08-23 | Nippon Hoso Kyokai <Nhk> | アナログ−ディジタル コンバータのドリフト補正方法 |
-
1992
- 1992-08-20 DE DE4227596A patent/DE4227596A1/de not_active Withdrawn
-
1993
- 1993-07-15 EP EP93111406A patent/EP0583622B1/fr not_active Expired - Lifetime
- 1993-07-15 DE DE59301860T patent/DE59301860D1/de not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
EP0583622A1 (fr) | 1994-02-23 |
DE4227596A1 (de) | 1994-02-24 |
DE59301860D1 (de) | 1996-04-18 |
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