EP0367560A2 - Dispositif de mise en place d'un cylindre d'appui pour imprimante à impact - Google Patents

Dispositif de mise en place d'un cylindre d'appui pour imprimante à impact Download PDF

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Publication number
EP0367560A2
EP0367560A2 EP89311232A EP89311232A EP0367560A2 EP 0367560 A2 EP0367560 A2 EP 0367560A2 EP 89311232 A EP89311232 A EP 89311232A EP 89311232 A EP89311232 A EP 89311232A EP 0367560 A2 EP0367560 A2 EP 0367560A2
Authority
EP
European Patent Office
Prior art keywords
platen
support structure
vibration absorbing
collar
vibration
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Withdrawn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
EP89311232A
Other languages
German (de)
English (en)
Other versions
EP0367560A3 (fr
Inventor
Minoru C/O Oki Electric Ind. Co Ltd. Mizutani
Masanori C/O Oki Electric Ind.Co Ltd. Maekawa
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.)
Oki Electric Industry Co Ltd
Original Assignee
Oki Electric Industry Co Ltd
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 Oki Electric Industry Co Ltd filed Critical Oki Electric Industry Co Ltd
Publication of EP0367560A2 publication Critical patent/EP0367560A2/fr
Publication of EP0367560A3 publication Critical patent/EP0367560A3/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Withdrawn legal-status Critical Current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
    • B41J29/00—Details of, or accessories for, typewriters or selective printing mechanisms not otherwise provided for
    • B41J29/02—Framework

Definitions

  • the present invention relates to a platen support structure for an impact printer, such as a wire matrix printer.
  • the platen of a printer can easily be removed from the main frame of the printer to facilitate removing a recording medium jammed in the printing mechanism and cleaning or replacing the platen.
  • the platen is supported rotatably on the main frame of the printer with the opposite ends of its support shaft projecting from the opposite ends thereof rotatably fitted in platen collars mounted on the side frame members of the main frame.
  • a printing mechanism employing such a platen support structure has the following problems.
  • a platen support structure comprises platen collars rotatably put respectively on the opposite ends of a platen support shaft projecting from the opposite ends of the platen, a pair of side frames provided on the main frame of an impact printer and provided respectively with recesses for receiving the platen collars, and vibration absorbing members provided on the side frames between the platen collars and the corresponding recesses.
  • the vibration of the platen caused by impact applied to the platen by the printing wires mounted on the print head and transmitted through the platen support shaft to the platen collars is absorbed by the vibration absorbing members to prevent the propagation of vibrations through the side frames. Consequently, the vibration of the impact printer due to the vibration of the platen caused by impact applied thereto can be prevented, noise attributable to the vibration of the platen caused by impact applied thereto is suppressed, and the impact printer is able to operate on a low noise level.
  • a platen assembly 1 comprises a cylindrical platen 3, a support shaft 5 fixedly mounted with the platen 3, a pair of platen collars 7, a gear 9 and vibration absorbing members 11 for absorbing the vibration of the platen caused by printing operation.
  • the opposite ends of the support shaft 5 project respectively from the opposite ends of the platen 3.
  • the platen collars 7 and the gear 9 are mounted on the support shaft 5.
  • a hole 13 is formed in the support shaft 5 for use in fixedly connecting the gear 9 to the support shaft 5.
  • each platen collar 7 has a through hole 7a for receiving the support shaft 5 therethrough, a neck portion 7i having opposite rectangular surfaces 7b and 7c for inserting the platen collar 7 in a recess formed in a side frame 15 and opposite circular surfaces 7d and 7e for restraining the platen collar 7 from falling off the side frame 15, flanges 7f and 7g formed at the opposite ends of the neck portion 7i to fix the position of the platen collar 7 relative to the side frame 15, and a knob 7h.
  • the platen collar 7 is supported at the neck portion 7i on the side frame 15.
  • the gear 9 is provided with a central through hole 9a for receiving the support shaft 5, and a radial through hole 9c in its boss 9b.
  • the gear 9 is connected fixedly to the support shaft 5 by mounting the gear 9 with the through hole 9c in alignment with the through hole 13 of the support shaft 5 and fitting a stopping member, not shown, through the through hole 9c of the gear 9 and the through hole 13 of the support shaft 5.
  • Rotative force of a line feed motor, not shown, is transmitted through the gear 9 and the support shaft 5 to the platen 3 to drive the platen 3 for stepping rotation at a predetermined pitch.
  • the vibration absorbing member 11 is formed of an elastic material, such as a plastic or rubber. As shown in Figs. 4(I) and 4(II), the vibration absorbing member 11 is mounted on the neck portion 7i of the platen collar 7.
  • the vibration absorption member 11 may be formed directly on the neck portion 7i, for example, by applying a material, such as a liquid material which becomes elastic when solidified, in a uniform thickness to the surface of the neck portion 7i.
  • the side frame 15 is provided with an opening consisting of a substantially circular aperture 15b and a slot 15a merging into the round aperture 15b.
  • the width of the slot 15a corresponds to the distance between the rectangular surfaces 7b and 7c, and the diameter of the substantially circular aperture 15b corresponds to the diameter of a circle circumscribing the neck portion 7i coated with the shock absorbing member 11.
  • the platen collar 7 mounted on the support shaft 5 on the side of the gear 9 is held between the outer end of the platen 3 and the gear 9 fixed to the support shaft 5 at a predetermined position by the fixing member, not shown, and is restrained from axial movement, which facilitates mounting the platen collar 7 on the side frame 15.
  • the platen collar 7 mounted on the other end of the support shaft 5 may be held at a fixed axial position for the same effect by putting a plastic or rubber ring on the support shaft 5 or by screwing a screw in the shaft 5 after mounting the platen collar 7 on the support shaft 5 to position the platen collar 7.
  • the sizes of the slot 15a and the substantially circular aperture 15b are determined taking into consideration the sizes of the neck portion 7i and the vibration absorbing member 11, and the physical properties, such as extensibility and compressibility, of the vibration absorbing member 11.
  • the platen collar 7 need not necessarily be held in place on the side frame 15 in the foregoing means; a platen collar having a round neck portion may be mounted on a side frame provided with a simple slot with the round neck portion received in the slot, and the platen collar may be held in place with fixing means.
  • the vibration absorbing members 11 absorb and attenuate the vibration, so that the vibration is not transmitted to the side frames 15.
  • the noise attributable to the vibration of the platen 3 is eliminated and hence the noise generated by the impact printer can be reduced accordingly.
  • a platen support structure in a second embodiment according to the present invention employs a vibration absorbing member 21 shown in Figs. 6(I) and 6(II).
  • the platen support structure is substantially the same in construction as the foregoing platen support structure, except the platen support structure in the second embodiment employs the vibration absorbing member 21 shown in Figs. 6(I) and 6(II).
  • the vibration absorbing member 21 is a separate member having the shape of a substantially oblong ring and provided with a single cut 17. In putting the vibration absorbing member 21 on the platen collar 7, the vibration absorbing member 21 is opened elastically at the cut 17 and is put on the neck portion 7i.
  • a platen support structure in a third embodiment according to the present invention employs a vibration absorbing member 31 shown Figs. 7(I), 7(II), and 7(III).
  • the platen support structure in the third embodiment according to the present invention is substantially the same in construction as the foregoing platen support structures, except that this platen support structure employs the vibration absorbing member 31 shown in Figs. 7(I) to 7(III).
  • the vibration absorbing member 31 is a barrel-­shaped piece provided with a break 19 and an annular groove 23 of a width substantially the same as the thickness of the side frame 15.
  • the annular groove 23 is formed in the middle of the outer circumference of the vibration absorbing member 31.
  • the vibration absorbing member 31 is inserted into the substantially circular aperture 15b of the side frame 15 as shown in Fig. 8 with the annular groove 23 closely engaging the edge of the substantially circular aperture 15b and with the break 19 in alignment with the slot 15a to allow the neck portion 7i of the platen collar 7 to pass through the slot 15a and the break 19.
  • this vibration absorbing member 31, similarly to the vibration absorbing member 21, can easily be replaced with a new one.
  • a platen support structure in a fourth embodiment according to the present invention employs a platen collar 27 shown in Figs. 9(I) to 9(IV).
  • the platen collar 27 comprises two parts, namely, a main member 28, and a holding member 29 provided with a groove of the same shape and size as those of the cross section of the neck portion 28a of the main member 28 in the surface facing the main member 28.
  • a vibration absorbing member having neither a cut nor a break can be put on the neck portion 28a of the platen collar 27.
  • a vibration absorbing member having a length shorter than that of the neck portion 28a is put on the neck portion 28a of the main member 28, and then a portion of the neck portion 28a projecting from the vibration absorbing member is fitted closely in the groove 29a of the holding member 29.
  • This platen collar 27 facilitates replacing an abraded, worn or aged vibration absorbing member with a new one and eliminates an additional process for forming a cut or break in the vibration absorbing member. Having neither a cut nor a break, the vibration absorbing member never fall accidentally off the platen collar 27 in mounting the platen assembly on and in removing the platen assembly from the side frames 15,
  • the platen support structure of the present invention includes vibration absorbing members of any suitable kind provided between the platen collars and the side frame of the impact printer to absorb and attenuate the vibration of the platen so that the vibration of the platen will not be transmitted to the side frames.

Landscapes

  • Handling Of Sheets (AREA)
EP19890311232 1988-11-02 1989-10-31 Dispositif de mise en place d'un cylindre d'appui pour imprimante à impact Withdrawn EP0367560A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP144025/88 1988-11-02
JP14402588U JPH0264049U (fr) 1988-11-02 1988-11-02

Publications (2)

Publication Number Publication Date
EP0367560A2 true EP0367560A2 (fr) 1990-05-09
EP0367560A3 EP0367560A3 (fr) 1990-11-07

Family

ID=31411369

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890311232 Withdrawn EP0367560A3 (fr) 1988-11-02 1989-10-31 Dispositif de mise en place d'un cylindre d'appui pour imprimante à impact

Country Status (2)

Country Link
EP (1) EP0367560A3 (fr)
JP (1) JPH0264049U (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2022639A1 (fr) * 2007-08-08 2009-02-11 ZIH Corporation Ensemble de cylindre

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2941172C2 (de) * 1979-10-11 1982-09-09 Triumph-Adler Aktiengesellschaft für Büro- und Informationstechnik, 8500 Nürnberg Lagerteil, z.B. für die Achse einer Schreibwalze in Büromaschinen
JPS58124820A (ja) * 1982-01-22 1983-07-25 Akira Washida 軸受
JPS60151U (ja) * 1983-06-17 1985-01-05 蛇の目ミシン工業株式会社 プリンタにおけるプラテン体の着脱構造
US4732502A (en) * 1984-11-19 1988-03-22 Brother Kogyo Kabushiki Kaisha Printer
JPS627576A (ja) * 1985-07-05 1987-01-14 Canon Inc プラテンロ−ラ
JPS6368445U (fr) * 1986-10-24 1988-05-09

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2022639A1 (fr) * 2007-08-08 2009-02-11 ZIH Corporation Ensemble de cylindre
US8979407B2 (en) 2007-08-08 2015-03-17 Zih Corp. Platen assembly

Also Published As

Publication number Publication date
JPH0264049U (fr) 1990-05-14
EP0367560A3 (fr) 1990-11-07

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