EP1079976B1 - Imprimante thermique a ruban encreur pour terminal de bureau - Google Patents
Imprimante thermique a ruban encreur pour terminal de bureau Download PDFInfo
- Publication number
- EP1079976B1 EP1079976B1 EP99920894A EP99920894A EP1079976B1 EP 1079976 B1 EP1079976 B1 EP 1079976B1 EP 99920894 A EP99920894 A EP 99920894A EP 99920894 A EP99920894 A EP 99920894A EP 1079976 B1 EP1079976 B1 EP 1079976B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- roller
- ribbon
- sheet
- printing
- driving
- 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
- B41J17/00—Mechanisms for manipulating page-width impression-transfer material, e.g. carbon paper
- B41J17/02—Feeding mechanisms
- B41J17/04—Feed dependent on the record-paper feed, e.g. both moved at the same time
Definitions
- Thermal printing in an office terminal is done on a heat-sensitive paper in rolls or on sheets of plain paper, by thermal transfer of ink particles from a ribbon inkpad plated on the sheet at a collaborating thermal head with a back-up roller.
- the ink ribbon comes from a roll debtor and is wound on a take-up roller.
- the paper, engaged with the tape and plated with adhesion to it by the print head, is pulled by a downstream rolling mill and thus drives the ribbon which therein at the same speed adheres.
- the rolling mill alternately changes direction of rotation to bring the sheet under the head.
- the ribbon and the sheet are previously detached from each other, after separation of the head and the roller, and a another color range of the ribbon is coincident with the leaf.
- the rolling mill serves as a position reference, that is to say that the sheet remains seized under pressure, with adhesion: its displacement longitudinal is therefore determined by the rotation of the rolling mill and an offset of the leaf is avoided. We do the same at the level of the head, during printing, to stick the sheet to the ribbon.
- the counter-support roller is strongly supported on the bearings which support it. As these have some friction, they oppose, to the rotation of the roller, a relatively friction torque Student. It is therefore necessary to exert, at the level of the rolling mill, a high motive force. to drive the paper strongly retained by friction at the level of the head, which requires a relatively powerful and therefore expensive motor, bulky and energy consuming.
- EP-A-0 612 626 teaches a printer in which the ink ribbon is set in motion at the same time as a sheet to be printed to limit the friction of the sheet on the ribbon:
- the present invention aims to limit the drawbacks mentioned above.
- the invention relates to a thermal printer for a terminal.
- data processing including a thermal print head associated with a support roller, arranged to press one on the other a print medium and an area of an ink ribbon from a supply roll, with, downstream, separation means for separating the print media ribbon, with a take-up roller on one side ribbon, driven by means of drive, and, on the other side, a motorized rolling mill for printing support, printer in which the drive means are arranged to exercise on the ribbon a driving force of the print medium, they have a variable power and are controlled by arranged control means to detect the presence of an anterior edge of the support to be printed upstream of the rolling mill and then order the drive means of the roller receiver at a power level providing the driving force of the support printing.
- the ribbon ensures at the beginning the transport of the support to be printed, or at the less contributes to it, which reduces the pulling force required for the rolling mill, and therefore the size of the mechanical elements concerned.
- the ribbon is pulled by winding on its take-up roller, just exercise on it the desired engine torque, without the need for mechanical means specific.
- the front edge area of a sheet of paper inserted between the head and the counter-support roller can be driven by the tape up to sheeter and can be printed as soon as it goes beyond the head, since its training in front of the head is perfectly controlled by the advance of the ribbon carrying her.
- the mechanical parts of the printer shown here a small color fax printer, have 1 print head thermal recalled elastically, by a spring 3, against a roller or counter anvil 2.
- a sheet 20 of printing paper can scroll, with an ink ribbon 21 plated on it, to an edge 4 of separation of these.
- the path of the sheet 20 continues substantially linearly to a rolling mill 5 drive assembly sheet 20, itself driven by a motor 8 controlled by a unit central 11 whose operation is clocked by a time base 10.
- a spring 7 presses a counter-roller 6 on the drive roller 5.
- the ribbon 21 comes from a supply roller 22 and, downstream of the edge 4, on which it slides, it is pulled by a take-up roller 23 in one direction markedly different from that of sheet 20 and forming an angle ⁇ with it.
- a user commands the central unit 11, so that a blank sheet 20 is driven by friction, by a motorized input roller not shown, between the head 1 and the roller 2, until being strongly gripped by the rolling mill 5, 6 which goes then ensure its lead in front of head 1 in synchronism with printing of the desired image data from a memory of faxes.
- roller 2 can be motorized in order to temporarily exert a tensile force on the sheet 20, and thus temporarily having the function of the rolling mill 5, 6 explained further in details below.
- a range, of desired color, of tape 21 has been identified by the central unit 11, which previously advanced the ribbon 21 to that it is aligned with the useful area of the sheet 20.
- the spring 3 exerts, on the head 1, a restoring force of several dozens of Newtons, which makes tape 21 and the sheet 20 and prevents slipping between them.
- Sheet 20 and ribbon 21 which pass by remain glued together until edge 4, at which level the ribbon 21 is peeled off, as it advances, by the motorized roller 23.
- the rolling mill 5, 6 can exert the tensile force FO of the sheet 20, the surface material of the rolling mill roll 5 has a good adhesion for sheet 20.
- Spring 7 exerts a force of recall of rollers 5, 6 towards each other sufficient to avoid any sliding of the driving roller 5 on the sheet 20.
- the take-up roller 23 provides the additional force F1 so to exert, at the level of the head 1 and of the roller 2, a force F0 + F1 of sufficient value to overcome the force of the resistance torque rotation of the tape feeder roller 21, the force of the torque resistance to rotation of the roller 2 and the friction force of the tape 21 on head 1, proportional to the coefficient of friction tape 21 / head 1 and to the restoring pressure force of the head 1 on the roller 2 exerted by spring 3.
- the ribbon 21 tends to entrain sheet 20 by adhesion.
- the driving force of the sheet 20 by the ribbon 21 is equal to the product of the pressure force of spring 3 by the friction coefficient paper 20 / tape 21.
- the return edge 4 is slightly rounded to avoid excessive friction of the ribbon 21, which is strongly stretched between the take-up roller 23 and the head 1.
- the face 211 of the ribbon 21, facing the head 1, sliding on this head and the edge 4, is smooth to limit the resistance to advancement of the tape 21.
- the face opposite 212, receiving sheet 20, is adhesive so that it adheres to it sheet 20.
- the coefficient of friction paper 20 / tape 21 is therefore high, which allows to exert on the sheet 20 a driving force high, by the tape 21, without having to increase the pressure force of the spring 3.
- the motor 24 may in particular tend to drive the ribbon 21 at a speed slightly higher than that of driving the sheet 20 by the rolling mill 5, 6, the adhesion sheet 20 - tape 21 and the resistant forces in fact limiting the speed of the ribbon 21 to that of the sheet 20. Because of this tendency to overspeed of the ribbon 21, the latter transfers, to the sheet 20 which adheres to it, part of its tensile force F1.
- the motor 24 exerts an increased torque, with respect to the above embodiment, to produce a tensile force F1 sufficient on its own to drive the ribbon 21.
- the roller 23 and motor 24 functionally replace the rolling mill 5, 6 to scroll the sheet 20 in front of the head 1.
- a leading zone, edge anterior, of sheet 20 slid between head 1 and the back-up roller 2 can thus be trained regularly, and therefore printed, even if it has not yet been entered by the rolling mill 5, 6. This avoids losing, for printing, the leading area of the sheet 20.
- a detector, not shown, of the front edge of the sheet 20 arranged just upstream of the head 1 initializes a rotation detector of the back-up roller 2 (or motorized roller 23, 24), the measurement of which makes it possible to determine whether the anterior edge of the sheet 20 is upstream of the rolling mill 5, 6 or has already reached it.
- the engine torque 24, with variable power is reduced to return to the operation explained at the beginning, in which the rolling mill 5, 6 must provide an FO force.
- the motor 24 for driving the take-up roller 23 has a variable power and is controlled by the central unit 11 arranged to detect the presence of an anterior edge of sheet 20 upstream of the rolling mill 5, 6, 7 and to then control the motor 24 at a level of power providing the driving force of the sheet 20.
- the rolling mill 5, 6 and the motor 24 for driving the roller 23 are then ordered synchronously. Specifically, as the engine torque applied by the motor 24 to the take-up roller 23 produces a force F1 inversely proportional to the radius of the ribbon roll 23, the unit control unit 11 memorizes the length of ribbon 21 that was used (number of printed pages) and, from the thickness of the ribbon 21, deduce therefrom radius of the ribbon roll 23, knowing that of the mandrel which carries it. The central unit 11 then regulates the torque of the motor 24 to apply to the take-up roller 23 a motor torque depending on the radius thereof and precisely to increase this couple as the radius of the roller 23 to as the tape 21 is wound up there, which keeps the force constant F1.
- the forces FO and F1 can each apply in whole or in part to one either of sheet 20 and tape 21 according to the ratio of these forces FO and F1, One pulls the other, but in a moderate way since this other layer also undergoes a pulling force FO or F1 which helps to overcome the force resistant it undergoes at the level of the head 1. Going up from the ridge 4, the parallel forces FO and F1 gradually change one the other by shearing between layers 20, 21, until reaching head 1 and roll 2, the sum remaining equal to FO + F1.
- This shearing effect can be used to facilitate the separation between the sheet 20 and the ribbon 21, for example by choice a ribbon 21 with great elasticity.
- the separation takes place at a distance downstream of the head 1 such as the differential elongation between the two layers 20, 21 reaches an amplitude for which the shear force enters layers exceeds the adhesive strength.
Landscapes
- Impression-Transfer Materials And Handling Thereof (AREA)
- Electronic Switches (AREA)
- Handling Of Sheets (AREA)
Description
- la figure 1 représente schématiquement des mécanismes d'entraínement du ruban et du papier d'impression et leurs circuits de commande dans l'imprimante de l'invention, et
- la figure 2 représente le papier d'impression et le ruban, avec les forces qui y sont exercées.
Claims (4)
- Imprimante thermique pour terminal de traitement de données, comportant une tête d'impression thermique (1) associée à un rouleau de contre-appui (2), agencés pour plaquer l'un sur l'autre un support d'impression (20) et une zone d'un ruban encreur (21) provenant d'un rouleau débiteur (22), avec, en aval, des moyens de séparation (4) pour séparer le ruban (21) du support d'impression (20), avec, d'un côté, un rouleau (23) récepteur du ruban (21), entraíné par des moyens d'entraínement (24), et, de l'autre côté, un laminoir motorisé (5, 6, 7) d'entraínement du support d'impression (20), imprimante dans laquelle les moyens d'entraínement (24) sont agencés pour exercer sur le ruban une force d'entraínement du support d'impression (20), ont une puissance variable et sont commandés par des moyens de commande (11) agencés pour détecter la présence d'un bord antérieur du support à imprimer (20) en amont du laminoir (5, 6 7) et pour alors commander les moyens d'entraínement (24) à un niveau de puissance fournissant la force d'entraínement du support d'impression (20).
- Imprimante selon la revendication 1, dans laquelle les moyens (24) d'entraínement du rouleau récepteur (23) sont agencés pour exercer sur le ruban (21) une force de traction supérieure à celle qu'exerce le laminoir (5, 6, 7) sur le support d'impression (20).
- Imprimante selon l'une des revendications 1 à 2, dans laquelle les moyens (24) d'entraínement du rouleau récepteur (23) sont commandés en synchronisme avec le laminoir (5, 6, 7).
- Imprimante selon la revendication 3, dans laquelle des moyens (11) de commande des moyens (24) d'entraínement du rouleau récepteur (23) sont agencés pour y appliquer un couple moteur fonction du rayon du rouleau récepteur de ruban (23).
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9806367A FR2778869B1 (fr) | 1998-05-20 | 1998-05-20 | Imprimante thermique a ruban encreur pour terminal de traitement de donnees |
FR9806367 | 1998-05-20 | ||
PCT/FR1999/001198 WO1999059824A1 (fr) | 1998-05-20 | 1999-05-20 | Imprimante thermique a ruban encreur pour terminal de bureau |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1079976A1 EP1079976A1 (fr) | 2001-03-07 |
EP1079976B1 true EP1079976B1 (fr) | 2003-09-24 |
Family
ID=9526549
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99920894A Expired - Lifetime EP1079976B1 (fr) | 1998-05-20 | 1999-05-20 | Imprimante thermique a ruban encreur pour terminal de bureau |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1079976B1 (fr) |
DE (1) | DE69911595T2 (fr) |
FR (1) | FR2778869B1 (fr) |
WO (1) | WO1999059824A1 (fr) |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6097878A (ja) * | 1983-11-01 | 1985-05-31 | Fuji Xerox Co Ltd | 転写型感熱記録装置 |
JPS6169645A (ja) * | 1984-09-12 | 1986-04-10 | Fuji Xerox Co Ltd | 薄膜状材料搬送装置 |
JPH0286479A (ja) * | 1988-09-22 | 1990-03-27 | Canon Inc | 熱転写記録装置 |
US5399031A (en) * | 1993-02-25 | 1995-03-21 | Eastman Kodak Company | Assisting movement of dye receiver past thermal print head |
GB9501734D0 (en) * | 1995-01-30 | 1995-03-22 | Neopost Ltd | franking apparatus and printing means therefor |
-
1998
- 1998-05-20 FR FR9806367A patent/FR2778869B1/fr not_active Expired - Fee Related
-
1999
- 1999-05-20 EP EP99920894A patent/EP1079976B1/fr not_active Expired - Lifetime
- 1999-05-20 DE DE69911595T patent/DE69911595T2/de not_active Expired - Lifetime
- 1999-05-20 WO PCT/FR1999/001198 patent/WO1999059824A1/fr active IP Right Grant
Also Published As
Publication number | Publication date |
---|---|
FR2778869B1 (fr) | 2000-06-23 |
DE69911595D1 (de) | 2003-10-30 |
FR2778869A1 (fr) | 1999-11-26 |
WO1999059824A1 (fr) | 1999-11-25 |
EP1079976A1 (fr) | 2001-03-07 |
DE69911595T2 (de) | 2004-06-24 |
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