EP0322076A2 - Mécanisme pour régler l'espacement entre la tête d'impression et le cylindre de frappe - Google Patents

Mécanisme pour régler l'espacement entre la tête d'impression et le cylindre de frappe Download PDF

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Publication number
EP0322076A2
EP0322076A2 EP88202964A EP88202964A EP0322076A2 EP 0322076 A2 EP0322076 A2 EP 0322076A2 EP 88202964 A EP88202964 A EP 88202964A EP 88202964 A EP88202964 A EP 88202964A EP 0322076 A2 EP0322076 A2 EP 0322076A2
Authority
EP
European Patent Office
Prior art keywords
actuating element
print head
adjusting
distance
working distance
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.)
Withdrawn
Application number
EP88202964A
Other languages
German (de)
English (en)
Other versions
EP0322076A3 (fr
Inventor
Manfred Adamek
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.)
Philips Intellectual Property and Standards GmbH
Koninklijke Philips NV
Original Assignee
Philips Patentverwaltung GmbH
Philips Gloeilampenfabrieken NV
Koninklijke Philips Electronics NV
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 Philips Patentverwaltung GmbH, Philips Gloeilampenfabrieken NV, Koninklijke Philips Electronics NV filed Critical Philips Patentverwaltung GmbH
Publication of EP0322076A2 publication Critical patent/EP0322076A2/fr
Publication of EP0322076A3 publication Critical patent/EP0322076A3/fr
Withdrawn legal-status Critical Current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

Definitions

  • the invention relates to a device for adjusting the distance between a print abutment and a print head, with an adjustment element kinematically coupled to the print head and adjustable via an actuating element, and with holding means for fixing the displacement path of the print head at a maximum free distance and at a working distance.
  • the invention has for its object to design the device of the type mentioned in such a way that a working distance that is optimal for the respective type of writing medium can be reliably set by means of uncomplicated operating steps.
  • the solution is achieved in that the actuating element is coupled to the adjusting element via a slipping clutch which is flexible in the adjusting direction when a predetermined adjusting force is exceeded, in that the available adjusting path of the actuating element exceeds the adjusting range of the adjusting element in both directions in such a way that both when the printhead is in contact with in front of the platen inserted as well as when reaching the clearance a further movement of the actuating element relative to the adjusting element is possible, and that the fixing of the working distance is effected by a holding force acting on the actuating element.
  • the adjustment element is always carried away from the actuating element until the print head presses against the writing medium.
  • the actuating element is then moved on slipping.
  • the actuating element is then moved back the same way to a latching position, taking the adjusting element, which is then firmly coupled, with it.
  • the printhead is consequently always brought into such a working position that a constant working distance between the writing medium and the printhead is always guaranteed.
  • the actuating element is advantageously movable between two end stops, one of which is placed at least so far that the pressure position of the printhead on the writing medium is reliably reached under all possible conditions.
  • the other end stop is intended to allow movement of the actuating element beyond the point at which the clearance of the print head is reached.
  • a reduction gear is provided between the actuating element and the print head in such a way that the displacement path of the actuating element is increased compared to the displacement path of the print head. In this way, compared to the very small displacement paths of the printhead, there are much larger and more manageable adjustment paths of the actuating element.
  • reduction gear contains two rotary levers kinematically coupled via ring gears.
  • a slip clutch can be realized particularly simply in that the actuating element is mounted coaxially with a rotary lever of the reduction gear under frictional pressure.
  • the latching position of the actuating element can advantageously be adjustable, in particular for the individual setting of different pressure levels.
  • the actuating element has a hand lever which can be fixed between two end positions in a latching position which defines the working distance of the print head. It is preferred that the hand lever is transported by a spring element from the end position, which corresponds to the abutment of the print head on the pressure abutment, in the direction of the latching position, so that an operator only has to move the actuating lever in one direction.
  • the actuating element is also possible for the actuating element to be driven by a stepper motor. Analogous to the end stops and the latching position of a manually operated lever, corresponding angular positions of the stepper motor are then to be specified by means of an electronic control circuit.
  • a writing medium 1 for example a single sheet of paper, bears against a platen roller 2.
  • a needle print head 3 can be moved in the axial direction of the platen roller 2, that is to say in the line direction, in a linear guide device 4.
  • the linear guide device 4 can be displaced perpendicular to the writing plane via the short lever arm of the lever 5.
  • an adjusting element 6 engages, which is displaceable on a bearing surface 7 in the direction of the double arrow 8.
  • the displacement path is limited in one direction by the stop 7 ', by which a maximum value of the distance a (free distance) is fixed.
  • the distance a has the value required for printing (working distance), which can be adjusted by means of the actuating element 9 and can be fixed in a latching position via the latching cam 13, which snaps into the holding element 14.
  • the actuating element 9 is resiliently pressed against a friction lining 12 of the adjusting element 6 via sliding abutments 10 and 11.
  • the actuating element 9 is first moved in the direction of the arrow 15. It takes the adjusting element 6 up to the stop 7 'and is then moved on until the locking cam 13 stops against the sliding abutment 11 acting as a stop.
  • the actuating element 9 is pushed in the direction of the arrow 16 and takes the adjusting element 6 with it until the needle print head 3 bears against the writing medium 1 with a pressure predetermined by the frictional force between the friction lining and the actuating element 9. In order for this position of the needle print head 3 to be reached with certainty, a sliding further movement of the actuating element 9 is necessary until the latching cam 13 strikes the sliding abutment 10.
  • the position of the holding element 14 can be adjustable in the direction of the arrows 15 or 16 in order to be able to specify different pressure levels.
  • a corresponding length ratio of the lever arms of the lever 5 enables the adjustment paths of the adjustment element 6 and of the actuating element 9 to be chosen to be considerably larger than the small adjustment range of the distance a.
  • the needle print head 3 is fastened to a carriage 18 which can be moved in the line direction on guide rods 19 and 20.
  • the guide rod 20 rotatable in the carriage 18 can be rotated in via the eccentric mandrel 21 a housing wall 22 (Fig. 4) mounted.
  • the segment lever 23 which is arranged on the guide rod 20 in a rotationally fixed manner by means of the screw 24, this guide rod and thus also the needle print head can be displaced in the direction perpendicular to the writing plane.
  • the maximum distance a (clearance) can be predetermined, as can be seen in the illustration in FIG. 5.
  • the pivoting movement of the segment lever 23 takes place via the pinion 26 of the adjusting element 27, which is mounted on an axis of rotation 40 and which meshes with the segment toothing 28 of the segment lever 23.
  • An actuating element 33 is mounted on the axis of rotation 40 in FIG. 2 behind the adjusting element 27 (corresponding to the alternatively designed actuating element 29 in FIG. 4) and pressed against the friction lining 31 of the adjusting element 27 by means of a compression spring 30 to form a slip clutch.
  • the actuating element 33 has an actuating arm 32 which can be deflected resiliently in the axial direction, which at the same time performs the function of the latching cam 13 according to FIG. 1 and interacts with a stop device 34 which can be seen in a top view in FIG. 3.
  • the manually actuable actuating arm 32 is replaced by a stepper motor 39, which meshes with its pinion 42 with an external toothing 41 of the actuating element 29.
  • the function of the arrangement shown in FIG. 3 is taken over by a control program for the stepper motor 39, which in each case specifies suitable step numbers in accordance with the required angular paths of the actuating element 29.

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  • Common Mechanisms (AREA)
  • Handling Of Sheets (AREA)
EP88202964A 1987-12-23 1988-12-19 Mécanisme pour régler l'espacement entre la tête d'impression et le cylindre de frappe Withdrawn EP0322076A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3743677 1987-12-23
DE19873743677 DE3743677A1 (de) 1987-12-23 1987-12-23 Vorrichtung zum einstellen des abstandes zwischen einem druckwiderlager und einem druckkopf

Publications (2)

Publication Number Publication Date
EP0322076A2 true EP0322076A2 (fr) 1989-06-28
EP0322076A3 EP0322076A3 (fr) 1989-11-08

Family

ID=6343338

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88202964A Withdrawn EP0322076A3 (fr) 1987-12-23 1988-12-19 Mécanisme pour régler l'espacement entre la tête d'impression et le cylindre de frappe

Country Status (3)

Country Link
EP (1) EP0322076A3 (fr)
JP (1) JPH023361A (fr)
DE (1) DE3743677A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5135316A (en) * 1990-05-29 1992-08-04 Juki Corporation Automatic print head position adjusting mechanism

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4023662A (en) * 1974-12-19 1977-05-17 Ing. C. Olivetti & C., S.P.A. Arrangement for adjusting the spacing between a print head and a platen
DE3112079C2 (de) * 1981-03-27 1983-02-03 Triumph-Adler Aktiengesellschaft für Büro- und Informationstechnik, 8500 Nürnberg Vorrichtung zum Abheben des Druckkopfes von der Druckgegenlage
US4444521A (en) * 1982-08-02 1984-04-24 United Systems Corporation Print medium advancing mechanism including print head retraction
US4738552A (en) * 1985-03-11 1988-04-19 Oki Electric Industry Co., Ltd. Platen gap adjusting mechanism of printer

Also Published As

Publication number Publication date
EP0322076A3 (fr) 1989-11-08
JPH023361A (ja) 1990-01-08
DE3743677A1 (de) 1989-07-06

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