EP0332863B1 - Vorrichtung zur Halterung eines Druckkopfes - Google Patents

Vorrichtung zur Halterung eines Druckkopfes Download PDF

Info

Publication number
EP0332863B1
EP0332863B1 EP89102605A EP89102605A EP0332863B1 EP 0332863 B1 EP0332863 B1 EP 0332863B1 EP 89102605 A EP89102605 A EP 89102605A EP 89102605 A EP89102605 A EP 89102605A EP 0332863 B1 EP0332863 B1 EP 0332863B1
Authority
EP
European Patent Office
Prior art keywords
tensioning
print head
arm
bearing
carrier part
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
Application number
EP89102605A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0332863A3 (en
EP0332863A2 (de
Inventor
Wolfgang Blindow
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.)
Wincor Nixdorf International GmbH
Original Assignee
Siemens Nixdorf Informationssysteme AG
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 Siemens Nixdorf Informationssysteme AG filed Critical Siemens Nixdorf Informationssysteme AG
Priority to AT89102605T priority Critical patent/ATE76000T1/de
Publication of EP0332863A2 publication Critical patent/EP0332863A2/de
Publication of EP0332863A3 publication Critical patent/EP0332863A3/de
Application granted granted Critical
Publication of EP0332863B1 publication Critical patent/EP0332863B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B41J25/34—Bodily-changeable print heads or carriages

Definitions

  • the invention relates to a device for holding a printhead on a printhead carriage of a printer according to the preamble of claim 1.
  • a device of the type mentioned above is known for example from GB-A-2 172 929.
  • a nose is formed on the clamping leg of the clamping lever, which engages behind a bead on the clamping surface of the printhead in the locking position of the clamping lever.
  • a device for holding a printhead in which the printhead carries two pins which by corresponding Reach through openings in a disk-shaped carrier part and each have an annular groove near their free ends.
  • the free ends of the pins which protrude beyond the carrier part engage in holes in a locking disk which are followed by elongated holes in the shape of a circular arc.
  • the edges of the elongated holes engage in the ring grooves of the pin ends, so that the print head is fixed on the carrier part.
  • it is secured to the carrier part via a ratchet catch. This type of locking of the print head on the carrier part is secure, but it requires relatively complicated parts.
  • the invention has for its object to provide a device of the type mentioned, which is simple in construction and inexpensive to manufacture and allows a convenient and quick replacement of the printhead, while still ensuring a secure and precise fit of the printhead on the support member.
  • the correct seating of the printhead on the carrier part is determined by the printhead receptacle and the contact surfaces.
  • the handle limbs of the tensioning levers must be moved parallel to the bearing axis, ie perpendicular to the swivel plane of the tensioning levers via the locking lugs. An unintentional opening of the tensioning lever, for example if the printhead is shaken more strongly, is therefore excluded.
  • the latching means on the carrier part and on the tensioning levers enable simple release and locking of the tensioning levers without the aid of tools.
  • the embodiment according to the invention enables simple mounting of the tensioning levers on the carrier part, no further parts being required.
  • the clamping lever is long enough to allow easy locking even with relatively high clamping forces.
  • the sufficient length of the tensioning levers simultaneously ensures that they are sufficiently elastic to be able to bend them out of engagement with the latching lugs on the carrier part.
  • the carrier part and the tensioning lever can be made of plastic, the choice of a suitable plastic on the one hand ensuring the necessary strength and on the other hand the required elasticity of the tensioning lever.
  • the clamping arm is directed relative to the bearing arm and the handle arm of the respective clamping lever in such a way that it bears against the clamping surface of the printhead under pretension in the locking position of the clamping lever.
  • At least one adjusting element on the carrier part which is intended to engage with a complementary counter element on the printhead.
  • FIG. 1 shows in its upper part a printhead, generally designated 10, with a housing 12 enclosing the actuating magnets for the printing needles and a mouthpiece 14 guiding the printing needles, the view of FIG. 1 looking at the needle outlet end of the mouthpiece 14.
  • an anchoring plate 16 is rigidly connected.
  • a mounting device which can be attached to the printer carriage of a printer and which is intended for exchangeable mounting of the print head 10.
  • the holding device comprises an elongated carrier part 20 with a centrally arranged rectangular recess 22, which extends transversely to the longitudinal direction of the carrier part 20 and is intended for receiving the mouthpiece 14 of the print head 10.
  • two adjusting pins 26 are formed on a contact surface 24 of the carrier part 20 intended for contacting the locking plate 16, which engage in complementary openings 28 in the locking plate 16 in order to ensure a precise fit of the printhead 10 on the carrier part 20.
  • the carrier part 20 each has a storage fork 30 for mounting tensioning levers 32.
  • the bearing fork 30 comprises two legs 33, 34 which delimit a bearing gap 36 into which a bearing leg 38 of the tensioning lever 32 engages.
  • the bearing arm 38 carries a bearing pin 40 which can be inserted into U-shaped bearing slots 42 in the fork legs 32, 34.
  • the straight part of the bearing slots 42 is somewhat narrower than the diameter of the bearing pins, while the bearing surface at the bottom of the bearing slots 42 corresponds exactly to the diameter of the bearing pins 40, so that they can be clipped into the U-shaped slots 42. No further means are therefore required to hold the tensioning levers 32 on the carrier part 20.
  • the bearing leg 38 of the respective clamping lever 32 is extended by a handle leg 44.
  • a handle leg 44 In a central region between the bearing axis and the free end of the handle leg 44, an approximately perpendicular to the longitudinal direction of the bearing leg 38 and the handle leg 44 extends clamping leg 46, the angle ⁇ of the clamping leg 46 with the bearing leg 38 being slightly less than 90 °.
  • detent 50 Arranged in each case on arms 48 directed parallel to the direction of insertion of the print head 10 into the carrier part 20 is a detent 50 which has a ramp-shaped instruction surface 52 which can be seen in FIG.
  • FIG. 3 shows the printhead 10 inserted into the holding device 18 with the tensioning levers 32 still open.
  • the tensioning levers 32 are pivoted in the direction of the arrows C in FIG. 3.
  • the clamping legs 46 come to rest on the upper side of the locking plate 16.
  • the grip legs 44 slide over the inclined instruction surfaces 52 of the lugs 50, the clamping levers 32 being deflected in the direction of the arrow D in FIG. 5 until they snap behind the lugs 50.
  • the clamping leg was braced against the pivoting direction of the arrow C, so that a corresponding holding force acts on the locking plate 16 in order to clamp the print head 10 firmly against the contact surface 24.
  • the locking position of the clamping lever 32 is shown in Figure 4.
  • the cam surface 54 shown in FIG. 1 lies flat on the bearing leg 38 of the respective tensioning lever 32 against the end surface 56 of the gap 36 of the bearing fork 30 and thus forms a stop for tensioning the tensioning lever 32 until the handle leg 44 behind it each latch 50 can snap into place.
  • the entire mounting device consists of three one-piece parts, the two clamping levers being identical. These parts can be manufactured in a simple and inexpensive manner, for example from plastic, and assembled in a simple manner. Locking and unlocking is extraordinary simple, so that a printhead change can be carried out very quickly and easily.

Landscapes

  • Common Mechanisms (AREA)
  • Facsimile Heads (AREA)
EP89102605A 1988-03-15 1989-02-15 Vorrichtung zur Halterung eines Druckkopfes Expired - Lifetime EP0332863B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89102605T ATE76000T1 (de) 1988-03-15 1989-02-15 Vorrichtung zur halterung eines druckkopfes.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3808648 1988-03-15
DE3808648A DE3808648C1 (enrdf_load_stackoverflow) 1988-03-15 1988-03-15

Publications (3)

Publication Number Publication Date
EP0332863A2 EP0332863A2 (de) 1989-09-20
EP0332863A3 EP0332863A3 (en) 1990-01-17
EP0332863B1 true EP0332863B1 (de) 1992-05-13

Family

ID=6349795

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89102605A Expired - Lifetime EP0332863B1 (de) 1988-03-15 1989-02-15 Vorrichtung zur Halterung eines Druckkopfes

Country Status (3)

Country Link
EP (1) EP0332863B1 (enrdf_load_stackoverflow)
AT (1) ATE76000T1 (enrdf_load_stackoverflow)
DE (1) DE3808648C1 (enrdf_load_stackoverflow)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ATE161484T1 (de) * 1989-09-18 1998-01-15 Canon Kk Tintenstrahlkopf-wagen und ein apparat mit demselben
EP0602709B1 (en) * 1992-12-14 1998-04-29 Agfa-Gevaert N.V. Thermal image-recording apparatus with locking means for holding a print head

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1050504B (it) * 1974-05-10 1981-03-10 Olivetti C E C S P A Dispositivo per il pusizionamento ed il bloccaggio di una testina elettrotermica
US3921780A (en) * 1974-07-18 1975-11-25 Gen Electric Assembly for mounting a print head
JPS58104781A (ja) * 1981-12-16 1983-06-22 Tokyo Electric Co Ltd プリンタ
JPH0632968B2 (ja) * 1985-03-26 1994-05-02 セイコーエプソン株式会社 印字ヘツド取り付け機構

Also Published As

Publication number Publication date
DE3808648C1 (enrdf_load_stackoverflow) 1989-04-27
EP0332863A3 (en) 1990-01-17
EP0332863A2 (de) 1989-09-20
ATE76000T1 (de) 1992-05-15

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