EP0958928B1 - Imprimante de terminal de traitement de données, à double laminoir de traction de papier support d'impression - Google Patents
Imprimante de terminal de traitement de données, à double laminoir de traction de papier support d'impression Download PDFInfo
- Publication number
- EP0958928B1 EP0958928B1 EP19990401214 EP99401214A EP0958928B1 EP 0958928 B1 EP0958928 B1 EP 0958928B1 EP 19990401214 EP19990401214 EP 19990401214 EP 99401214 A EP99401214 A EP 99401214A EP 0958928 B1 EP0958928 B1 EP 0958928B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- roller
- head
- sheet
- rolling mill
- printer
- 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
- 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
- B41J11/04—Roller platens
- B41J11/057—Structure of the surface
-
- 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
- B41J13/02—Rollers
- B41J13/076—Construction of rollers; Bearings therefor
Definitions
- a data processing terminal printer such as by example a fax machine
- the supply of sheets to be printed is done by sliding the leading edge of a sheet to an input rolling mill consisting of a roller against the print head.
- the input rolling mill drives the sheet to a downstream rolling mill which grabs it firmly the anterior leading edge, in order to drive the sheet so perfectly controlled, at the expected speed, and thus control with precision the successive positions it occupies in front of the head during printing of successive lines of the document to be printed.
- the problem of controlling the positioning of the sheet is even more acute in the case of color printing, in several passes, to which must be brought back the sheet, with each time a high-precision framing for partial images of different colors make up as expected.
- the present invention therefore aims to solve the above problem sheet feeder in a two-roll printer.
- the invention relates to a processing terminal printer data, comprising a print head of a print medium and a head support roller, controlled by means drive in rotation and forming head rolling mill for transmission from the print medium to a downstream support rolling mill for drive and guide support, printer characterized by fact that the drive means of the roll of the head rolling mill are arranged to disengage the counter-support roller of this head rolling mill.
- the declutching can consist of a mechanical action of disengaging at level of a kinematic chain for driving the roller or a purely electromagnetic action to allow free rotation roller drive motor.
- the head rolling mill can be deactivated so that the supporting rolling mill perfectly controls the movement of the print media, without the head rolling mill obstructs this movement, thus avoiding all parasitic sliding of the print medium in front of the head and allows precise cropping when printing in multiple passes.
- the mechanical parts of the printer shown, here a small fax printer, here color, have a head 1 thermal printing resiliently recalled by a powerful spring 3, against a roller or back-up anvil 2.
- the back-up roller 2 thus forms, with the head 1, a head rolling mill, gripping and guiding sheets 20 of paper to be printed for them to scroll in front of the head 1.
- a sheet 20 can thus scroll, with an ink ribbon 21 plated on it, up to an edge 4 of separation of these.
- the rolling mill 1, 2 also ensures the training thereof.
- a rotary motor 32 here with stepping control, controlled by a central unit 11 whose operation is timed by a time base 10, drives in rotation, by a kinematics to toothed wheels not shown, the back-up roller 2 in one direction and in the other.
- the movement of the sheet 20 under the effect of the roller 2 continues substantially linearly up to two opposite rollers 35, 36 of a downstream printing support rolling mill, for positioning and the drive with guide of the sheet 20 in front of the head 1 and the extraction of sheet 20 after printing.
- the roller 35 is driven by a motor 38 controlled by the central unit 11.
- a spring 37 presses the roller 36 on the motor roller 35.
- the ribbon 21 comes from a supply roller 22 and, downstream of the edge 4, on which it slides, it is pulled slightly by a take-up roller 23 in a direction moving it away from the sheet 20, to peel it off.
- a sheet presence sensor 20 such as tilting finger pushed back by the front edge of the sheet 20 to cut an optical fork, control, through the central unit 11, the activation motor 32 at nominal value, when it detects the leading edge of a sheet 20.
- Sheet 20 is presented manually or comes from a tray, being driven by rollers not shown.
- the leading edge of the sheet 20 is then gripped by the rolling mill input 1, 2 and the support roller 2 drives the sheet 20 towards downstream.
- the surface of the back-up roller 2 is made of a material to adhesive properties, exhibiting good adhesion to paper. Of plus, the back-up roller 2 is coated with a layer of material deformable which crashes elastically and thus increases the surface of contact roller 2 - sheet 20 to avoid any parasitic sliding. It is the same for roller 35.
- the front edge of the sheet 20 thus reaches the rolling mill 35-37 where it is seized.
- the latter's motor 38 could be activated by the unit control unit 11 at the same time as the back-up roller 2 and therefore first turn empty. In this example, however, it is activated with a delay, however not exceeding the transfer time from the front edge sheet 20, between the counter-supporting roller 2 and the rolling mill 35-37, so that this edge does not come up against it.
- This delay here precisely equal to this transfer time, is in memory in the central unit 11 under the shape of a number of rotations, or steps in advance, of the roller counter-support 2, which are determined by the unit controls central 11 applied to the motor 32.
- a sheet 20 being gripped by the rolling mill 35-37 we then go to the printing phase of the sheet 20 following the primer. Given the fact that the input rolling mill 1, 2 grabbed the sheet 20 and sticks its primer to the tape 21 when it advance, an impression may already take place in this phase of loading, on the leading strip of sheet 20.
- the rolling mill 35-37 which is master of the advance of the sheet 20 and here of its decline since it is a three pass color printer printing.
- Motor 32 with its kinematics is controlled by the unit control unit 11 so that it exerts substantially no action (engine torque or resistant) counteracting the movements communicated by the rolling mill 35-37 on sheet 20. Therefore, when advancing, during printing, the sheet 20 under the effect of the rolling mill 35-37, the back-up roller 2 does not present substantially any torque opposing the movement of its sheet 20. This eliminates any constraint of precision on the relative speeds of rotation of rollers 2 and 35 and their diameters related.
- the back-up roller 2 is disengaged and is free to rotate when the downstream rolling mill 35-37 grabbed sheet 20. Motor 32 is then not controlled by the central unit 11 and rotates freely. It might be planned to mechanically disengage the kinematic link between the motor 32 and the back-up roller 2, in order to remove, at this level last, any resisting torque due for example to magnetic poles of the motor 32.
- the back-up roller 2 is therefore coasting.
- the roller 2 is associated with a freewheeling mechanism and rotates at a speed tangential lower than that of rolling mill roll 35, so that this last freewheel roll 2 as soon as sheet 20 is entered by the rolling mill 35, 36.
- the downstream rolling mill 35, 36 causes the sheet 20 at a free wheel speed of the roller 2 and of its motor 32.
- the central unit 11 thus performs a control switching, for successively order only one of the two rollers motors, counter-support 2 and downstream rolling mill 35. Switching mechanical, from one of the rollers 2, 35 to the other, of a kinematic chain driven by a motor (32, 38) common to the two rolling mills 2, 35 would similarly possible.
- the central unit 11 controls the supply of head 1 with data one color image, at the rate of rotation of the drive roller 35.
- the roller motor 35 of downstream rolling mill changes direction of rotation, by controlling the central unit 11 on the engine 38, to bring back the on-board area anterior, downstream, of the sheet 20 at the level of the head 1, while the ribbon 21 is advanced by the motor 24 to present an area of another color.
- the central unit 11 takes off the sheet 20 from the ribbon 21 by controlling an actuator, not shown, which opposes the action of spring 3 and repels temporarily head 1 to move it away from the back-up roller 2.
- the rollers 35, 36 eject the sheet 20, the back-up roller 2 remaining disengaged.
Landscapes
- Delivering By Means Of Belts And Rollers (AREA)
- Handling Of Sheets (AREA)
- Electronic Switches (AREA)
Description
Claims (4)
- Imprimante de terminal de traitement de données, comportant une tête (1) d'impression d'un support d'impression (20) et un rouleau (2) de contre-appui de la tête (1) revêtu d'une couche de matériau déformable à écrasement élastique présentant une bonne adhérence avec le support d'impression (20), le rouleau (2) étant commandé par des moyens d'entraínement en rotation (32) et formant laminoir de tête pour le guidage du support d'impression (20) et sa transmission à un laminoir aval (35-38) de support pour l'entraínement et le guidage du support (20), imprimante dans laquelle les moyens (32) d'entraínement du rouleau du laminoir de tête sont agencés pour débrayer le rouleau de contre-appui (2) de ce laminoir de tête.
- Imprimante selon la revendication 1, dans laquelle il est prévu des moyens (11) de commutation de commande, pour successivement commander exclusivement l'un des rouleaux de contre-appui (2) et de laminoir aval (35).
- Imprimante selon l'une des revendications 1 et 2, dans laquelle les moyens d'entraínement (32) sont agencés pour débrayer le rouleau de contre-appui (2) par réduction d'un champ électromagnétique d'entraínement de celui-ci.
- Imprimante selon l'une des revendications 1 à 3, dans laquelle les moyens d'entraínement (32) comportent une roue libre et le laminoir aval (35-38) est agencé pour entraíner le support d'impression (20) à une vitesse de roue libre des moyens d'entraínement (32).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9806368 | 1998-05-20 | ||
FR9806368 | 1998-05-20 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0958928A1 EP0958928A1 (fr) | 1999-11-24 |
EP0958928B1 true EP0958928B1 (fr) | 2004-12-15 |
Family
ID=9526550
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19990401214 Expired - Lifetime EP0958928B1 (fr) | 1998-05-20 | 1999-05-20 | Imprimante de terminal de traitement de données, à double laminoir de traction de papier support d'impression |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0958928B1 (fr) |
DE (1) | DE69922580T2 (fr) |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5021804A (en) * | 1987-11-13 | 1991-06-04 | Minolta Camera Kabushiki Kaisha | Thermal transfer color printer |
JPH029553U (fr) * | 1988-06-23 | 1990-01-22 |
-
1999
- 1999-05-20 DE DE69922580T patent/DE69922580T2/de not_active Expired - Lifetime
- 1999-05-20 EP EP19990401214 patent/EP0958928B1/fr not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
EP0958928A1 (fr) | 1999-11-24 |
DE69922580D1 (de) | 2005-01-20 |
DE69922580T2 (de) | 2005-12-22 |
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