EP0947343B1 - Drucker, insbes. Nadel-Matrixdrucker - Google Patents
Drucker, insbes. Nadel-Matrixdrucker Download PDFInfo
- Publication number
- EP0947343B1 EP0947343B1 EP98124395A EP98124395A EP0947343B1 EP 0947343 B1 EP0947343 B1 EP 0947343B1 EP 98124395 A EP98124395 A EP 98124395A EP 98124395 A EP98124395 A EP 98124395A EP 0947343 B1 EP0947343 B1 EP 0947343B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- holder
- recording medium
- print head
- 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
Links
- 239000011159 matrix material Substances 0.000 title claims description 10
- 238000000034 method Methods 0.000 claims description 8
- 238000005299 abrasion Methods 0.000 claims description 3
- 239000000523 sample Substances 0.000 description 4
- 238000005259 measurement Methods 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
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
- 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
- B41J25/3082—Bodily-movable mechanisms for print heads or carriages movable towards or from paper surface with print gap adjustment mechanisms with print gap adjustment means on the print head carriage, e.g. for rotation around a guide bar or using a rotatable eccentric bearing
-
- 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
Definitions
- the invention relates to printers, in particular matrix dot matrix printers with a longitudinally displaceable holder mounted on a guide, in particular a guide shaft for receiving the printhead, which is driven by a drive parallel to one with a Record carrier occupied pressure abutment is moved, the distance between the printhead tip and the platen (pressure gap), taking into account the strength of the inserted recording medium by means of a Sensor controlled actuator assigned to the printhead holder to a required one Value is set.
- the invention relates to methods by means of which the pressure gap and the touch strength can be adjusted.
- a scanning element is used, which consists of a the one end of a probe lever rotatably mounted, acted upon by a spring force Tactile role exists.
- the sensing element has an indicator with the sensor an electronic circuit for generating an analog signal cooperates.
- the indicator consists of a soft iron part that works with a sensor, which consists of a field plate differential sensor.
- DE-C2- 40 25 483 describes a printing device in which the pressure gap setting is controlled depending on probes made up of a magnet and a Hall probe.
- the Hall probe is on an elastically deformable Pressure plate mounted, the free end mechanically against the Surface of the record carrier is present.
- the associated magnet is rigid connected to the printhead or its holder.
- the invention has for its object a printer with a device for setting of the pressure gap, which provide a high degree of operational reliability guaranteed, works precisely and is simple to set up,
- the object is described in a printer of the input Art solved in that the sensor from an associated with the printhead holder Tactile finger and an electrical transmitter actuated by this, the Touch finger is arranged such that it changes position, esp.
- the bearing play between the guide and the holder of the printhead and the encoder detects a control signal returns when the printhead moves against the actuator moved the surface of the record carrier or the pressure abutment as a stop and so that the printhead holder is raised relative to the guide.
- a holder for the print head which has a guide sleeve slides on a guide shaft.
- the touch finger can then be arranged in this way be that he through a bottom opening in the sleeve or close to the edge of the Sleeve pressed by its own weight or a spring against the guide shaft becomes.
- the print head is driven by an actuator against the record carrier or the print abutment is pressed, the holder of the print head is in the frame the game between the guide shaft and sleeve slightly raised and thus the Touch finger moves.
- the touch finger transfers the small movement to an electrical encoder, the Signal the reached, defined position of the print head from the position of the actuator detected.
- the touch finger is designed as a rocker arm, it is advantageous that Arrange the bearing of the lever so that the lever part on the guide shaft is applied to the lever part that acts on the electrical encoder, a mechanical Translation of, for example, 1: 3 results.
- At least the one against the guide shaft Touch finger is advantageously made of a very slidable, low-abrasion plastic formed or equipped with one,
- FIG. 2 shows a perspective illustration, partly in section, of a Print head holder for a dot matrix printer.
- the same or similar parts are in both Figures with the same reference numerals.
- Fig. 1 shows a holder 1 for the printhead 2 with its printhead tip 3.
- the Printhead 2 is elastically supported in the holder 1 via springs 4.
- a not shown Ribbon holder is assigned to printhead tip 3.
- the pressure abutment 6 is arranged.
- a record carrier 5 usually a paper tape, laid in one or more layers.
- the Printhead 2 can be opposite by a schematically indicated actuator 7 the holder 1 and thus relative to the pressure abutment 6 for setting the pressure gap be moved.
- a stepper motor is used as a drive for the actuator 7, so a step counter can not only the position of the print head 2 at Apply to a recording medium 5 and opposite the pressure abutment 6 capture, but also the return movement of the print head 2 for the setting of Monitor and control the pressure gap.
- the holder 1 for the print head 2 is in the printer housing on a guide shaft 8 stored using a guide sleeve 9.
- a touch finger 10 is arranged in the region of an opening in the wall of the sleeve 9.
- the touch finger 10 is designed as a lever and is rigidly connected to the holder 1 Axis 11 pivotally mounted. With the end 12, the touch finger 10 rests the guide shaft 8 and with the end 13 on the tilting movement of the finger 10 detecting electrical encoder 14.
- the dead weight of the touch finger 10 and a spring 15, which may be additionally used, ensure good installation of the touch finger end 12 to the guide shaft 8. Since the end 12 of the touch finger 10 constantly slides on the guide shaft 8 in the printing mode, it is advantageous the finger 10 or at least the adjacent end 12 from a low-abrasion, easy to slide To manufacture plastic.
- the gap is very small, 10 ⁇ m to a maximum of 30 ⁇ m, so much smaller than in the schematic Drawing shown for better understanding.
- the little, alone for reasons of good sliding properties of the print head holder 1 with its sleeve 9 opposite the guide shaft 8 inevitably existing game shows that the sleeve 9th supported by the weight of the holder 1 together with the print head 2 and, if necessary by the force of the spring 15, rests on top of the guide shaft 8 and below the drawn gap forms.
- the print head 2 If the print head 2 is actuated by the actuator 4 against the recording medium 5 or the pressure abutment 6 moves, when the print head tip 3 is placed on the Pressure abutment 6, or the recording medium 5 of the print head holder 1 with its Sleeve 3 raised by the small tolerance gap. This will be the end 12 of the Touch fingers 10 moved down.
- the associated stroke of the end 13 against the force of the spring 15 actuates the electrical transmitter 14.
- the spring 15 should be designed to be comparatively strong. This ensures that in printing operation in which the needles against the recording medium 5th beat, no lifting of the holder 1 relative to the guide shaft 8 and thus there is also no signal from the transmitter 14.
- the position of the surface of the recording medium can be 5 determine very precisely about the position of the actuator 4, so that also the setting of a defined printing gap with respect to the recording medium 5 can be done precisely by the actuator 4 without adjusting the components beforehand.
- FIG. 2 are the parts described with the schematic drawing of FIG. 1, provided with the same names.
- this figure is a guide profile 16 that prevents the holder 1 from tipping over the guide shaft 8.
- the skid-like parts 17 accommodate the retaining springs 4 of the print head 2.
- the breakthroughs 18 is a worm shaft used as part of the actuator 4 vertical adjustment of the print head 2 takes place.
- the holder 1 forms a receptacle 19 for the printhead, not shown in this figure.
- the actuator 4 not only move the print head 2 against the pressure abutment 6 must, but also ensure a very precise adjustment of the pressure gap if it is appropriate to use a stepper motor for the actuator 4 and Make adjustment movements in the pilgrim step.
- a method can be carried out in a simple manner to adjust the pressure gap.
- the printhead 2 is used in this process by the actuator 4 in a rest position, for. B. at the end of a line, against the pressure abutment 6 occupied with the recording medium 5 until the Guide sleeve 9 of the print head holder 1 is raised relative to the guide shaft 8 and thus a signal is triggered via the touch finger 10.
- the signal is the Movement of the actuator 4 and thus also the print head 2 stopped reached position and then the print head 2 by the actuator 4, preferably in the mitage step, to a defined print distance from the recording medium 5 set.
- the pressure gap can also be set during printing.
- the printing operation needs z. B. only briefly interrupted in a line connection and the print head 2 are moved against the recording medium 5.
- the so The measurement data obtained allow the pressure gap to be set so quickly that practically no interruption in pressure can be determined.
Landscapes
- Common Mechanisms (AREA)
Description
Claims (9)
- Drucker, insbes. Matrixdrucker, mit einem längsverschieblich auf einer Führung gelagerten Halter zur Aufnahme des Druckkopfes, der durch einen Antrieb parallel zu einem mit einem Aufzeichnungsträger belegten Druckwiderlager bewegt wird, wobei der Abstand zwischen der Druckkopfspitze und dem Druckwiderlager (Druckspalt), unter Berücksichtigung der Stärke der eingelegten Aufzeichnungsträger durch einen über einen Sensor gesteuerten, dem Halter zugeordneten Stellantrieb auf einen erforderlichen Wert eingestellt wird, dadurch gekennzeichnet, daß der Sensor aus einem dem Druckkopfhalter (1) zugeordneten Tastfinger (10) und einem von diesem betätigten elektrischen Geber (14) besteht, der Tastfinger (10) derart angeordnet ist, daß er Lagenänderungen, vorzugsweise das Lagerspiel, zwischen der Führung (8) und dem Halter (1) des Druckkopfes (2) erfaßt und der Geber (14) ein Steuersignal liefert, wenn der Druckkopf (2) bei einer Bewegung durch den Stellantrieb(4)gegen die Oberfläche des Aufzeichnungsträgers (5) als Anschlag gefahren und damit der Druckkopfhalter (1) angehoben wird.
- Drucker nach Anspruch 1, dadurch gekennzeichnet, daß der Halter (1) für den Druckkopf (2) eine Führungshülse (9) für eine Führungswelle (8) bildet und der Tastfinger(10), dicht am Rande der Führungshülse (9) oder durch eine Ausnehmung in deren Wandung vorzugsweise unter Belastung durch dessen Eigengewicht oder eine Feder (15) gegen die Führungswelle (8) anliegt.
- Drucker nach Anspruch 1 und 2, dadurch gekennzeichnet, daß der Tastfinger (10) als am Druckkopfhalter (1) gelagerter Kipphebel ausgebildet ist, der einerseits gegen die Führungswelle (8) anliegt und andererseits mit dem elektrischen Geber (14) gekoppelt ist.
- Drucker nach Anspruch 1 bis 3, dadurch gekennzeichnet, daß der Tastfinger (10) so am Druckkopfhalter (1) schwenkbar gelagert ist, daß sich vom Tastfinger (10) an der Führungswelle (8), zum elektrischen Geber (14) eine mechanische Übersetzung ergibt.
- Drucker nach Anspruch 1 bis 4, dadurch gekennzeichnet, daß zumindest das an der Führungswelle (8) anliegende Teil (12) des Tastfingers (10) aus einem abriebarmen, gut gleitfähigen Kunststoff besteht.
- Drucker nach Anspruch 5, dadurch gekennzeichnet, daß der elektrische Geber (14) als Piezoelement ausgebildet ist.
- Drucker nach Anspruch 5, dadurch gekennzeichnet, daß der Geber (14) als Dehnungsmeßstreifen, vorzugsweise als gesputtertes Widerstandselement ausgebildet ist.
- Verfahren zum Einstellen des Druckspaltes bei einem Drucker nach Anspruch 1 bis 7, dadurch gekennzeichnet, daß der Druckkopf (2) durch den Stellantrieb (4) in einer Ruheposition, z. B. an einem Zeilenende, gegen das mit dem Aufzeichnungsträger (5) belegten Druckwiderlager (6) gefahren wird, bis die Führungshülse (9) des Druckkopfhalters (1) gegenüber der Führungswelle (8) angehoben und damit über den Tastfinger (10) ein Signal ausgelöst wird, durch das die Bewegung des Stellantriebes (4) und damit auch des Druckkopfes (2) gestoppt, dessen erreichte Position erfaßt und dann der Druckkopf (2) durch den Stellantrieb (4), vorzugsweise im Pilgerschritt, auf einen definierten Druckabstand zum Aufzeichnungsträger (5) eingestellt wird.
- Verfahren zum Einstellen der Anschlagkraft eines Nadeldruckers in Abhängigkeit der durch die Aufzeichnungsträger (7) gegebenen Auflagestärke auf dem Druckwiderlager (6), unter Einsatz eines Druckers nach Anspruch 1 bis 7, dadurch gekennzeichnet, daß der Druckkopf (2) durch den Stellantrieb (4) zunächst seitlich neben dem Aufzeichnungsträger (5), gegen das Druckwiderlager (6) bewegt wird, bis der Sensor (14) anspricht, diese Lage des Stellantriebes (4) dann mit der Lage des Stellantriebes (4) nach dem Anlegen des Druckkopfes (2) gegen das mit dem Aufzeichnungsträger (5) belegten Druckwiderlager (6) verglichen und aus der Lagendifferenz die Anschlagkraft eingestellt wird.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19813899A DE19813899A1 (de) | 1998-03-28 | 1998-03-28 | Drucker, insbesondere Matrix-Nadeldrucker |
| DE19813899 | 1998-03-28 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0947343A2 EP0947343A2 (de) | 1999-10-06 |
| EP0947343A3 EP0947343A3 (de) | 2000-02-02 |
| EP0947343B1 true EP0947343B1 (de) | 2002-03-13 |
Family
ID=7862767
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP98124395A Expired - Lifetime EP0947343B1 (de) | 1998-03-28 | 1998-12-22 | Drucker, insbes. Nadel-Matrixdrucker |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP0947343B1 (de) |
| DE (2) | DE19813899A1 (de) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3830880A1 (de) * | 1988-09-08 | 1990-03-15 | Mannesmann Ag | Drucker, insbesondere matrixnadeldrucker, mit einer druckkopfabstandseinstelleinrichtung |
| DE3913073A1 (de) * | 1989-04-21 | 1990-10-25 | Philips Patentverwaltung | Verfahren zur einstellung eines druckspaltes bei einem drucker |
| DE4025483C2 (de) * | 1990-08-10 | 1995-03-16 | Siemens Nixdorf Inf Syst | Druckeinrichtung |
| JPH04282261A (ja) * | 1991-03-08 | 1992-10-07 | Brother Ind Ltd | 印字ヘッドにおける印字隙間検出装置 |
| JPH04355177A (ja) * | 1991-05-31 | 1992-12-09 | Brother Ind Ltd | 印字ヘッドのギャップ調整装置 |
-
1998
- 1998-03-28 DE DE19813899A patent/DE19813899A1/de not_active Withdrawn
- 1998-12-22 EP EP98124395A patent/EP0947343B1/de not_active Expired - Lifetime
- 1998-12-22 DE DE59803330T patent/DE59803330D1/de not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| DE19813899A1 (de) | 1999-09-30 |
| EP0947343A3 (de) | 2000-02-02 |
| DE59803330D1 (de) | 2002-04-18 |
| EP0947343A2 (de) | 1999-10-06 |
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