EP0282207B1 - Couvercle antipoussière pour une imprimante - Google Patents

Couvercle antipoussière pour une imprimante Download PDF

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Publication number
EP0282207B1
EP0282207B1 EP88301676A EP88301676A EP0282207B1 EP 0282207 B1 EP0282207 B1 EP 0282207B1 EP 88301676 A EP88301676 A EP 88301676A EP 88301676 A EP88301676 A EP 88301676A EP 0282207 B1 EP0282207 B1 EP 0282207B1
Authority
EP
European Patent Office
Prior art keywords
shield
assembly
catching
printing media
sprockets
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
EP88301676A
Other languages
German (de)
English (en)
Other versions
EP0282207A3 (en
EP0282207A2 (fr
Inventor
Anthony Wayne Ebersole
Robert W. Beauchamp
Ta C. Chuong
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.)
HP Inc
Original Assignee
Hewlett Packard Co
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 Hewlett Packard Co filed Critical Hewlett Packard Co
Publication of EP0282207A2 publication Critical patent/EP0282207A2/fr
Publication of EP0282207A3 publication Critical patent/EP0282207A3/en
Application granted granted Critical
Publication of EP0282207B1 publication Critical patent/EP0282207B1/fr
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
    • B41J29/00—Details of, or accessories for, typewriters or selective printing mechanisms not otherwise provided for
    • B41J29/12—Guards, shields or dust excluders

Definitions

  • the present invention generally relates to printers such as those which are commonly used in conjunction with a computer terminal. More particularly, the present invention relates to a shielding device for keeping printing media particles away from the printhead and other moving parts of the printer that such particles or accumulations of particles can disrupt.
  • EP-A-0189124 describes a printer which has a hinged cover which may be lifted for access to the printer and paper.
  • the printer includes a sprocket wheel assembly, or paper transport means, and guiding means which partially encases the assembly when the cover is closed.
  • Paper dust is particularly a nuisance to a thermal ink jet printhead which has a set of tiny orifices designed to eject boiled ink vapor droplets. A single particle of paper dust may be sufficient to clog such an orifice.
  • a general description of such ink jet technology can be found, for example, in the Hewlett Packard Journal , Volume 36, Number 5, May 1985.
  • a printing media particle shield for a printer having a sprocket wheel drive assembly for advancing said printing media, comprising means for catching said particles emitted, in use, by said media at said assembly; and means for channelling said particles away from said catching means; characterised in that the shield is attached to or is an integral part of the drive assembly and in that said catching means comprises: a channel region for initially catching and channelling said particles toward said channelling means and shield strip members along each upper rim of said channel region for inhibiting the emission of said particles over said rim.
  • An advantage of the present invention is that it decreases the susceptibility of the printhead to paper dust interference or clogging.
  • Another advantage of the preferred embodiment of the present invention is that it provides protection for the printhead by holding down the sides of the print media as it passes by the printhead.
  • FIGURE 1 a preferred embodiment of the dust shield 1 of the present invention is shown.
  • Each sprocket wheel paper drive assembly of the printer is to be equipped with such a shield 1.
  • the dust shield 1 has two particular features: a sprocket hole dust catcher 3 and a channeling plate 5.
  • the catcher 3 as shown in more detail in FIGURES 2 and 3, is formed to have a curved channel region 7 which will allow free passage of paper catching sprockets.
  • a shield strip 9, 9 ⁇ borders each side of the channel region 7 in order to prevent paper dust particles generated by the sprocket/paper hole contact from being discharged over the rim 11 of the channel region 7 where it still could cause a problem, such as by transferring to and blocking a printhead orifice (not shown).
  • a keyed pin 13 for connecting the catcher 3 to a sprocket wheel assembly 101 as shown in FIGURE 4.
  • the combination of keyed pin 13 with fixed pin 14 aligns and connects the shield 1 to the sprocket wheel assembly 101.
  • the channel region can be made large enough also to guide larger pieces of paper which may be torn loose by the sprocket assembly out of the top of the catcher where they can be easily removed by the operator.
  • the channeling plate 5 in this embodiment is formed of a thin, flexible metal sheet. Its upper edge 15 is connected to the lower edge 17 of the catcher 3, such as by well-known insert molding techniques, e.g. tabs 16 are inserted into the mold prior to plastic injection.
  • the lower portion 19 of the plate 5 has a bend 21.
  • the flat 23 which forms the lower end 25 of the channeling plate 5 has a catch-hole 27 for attaching the channeling plate 5 to the sprocket wheel assembly 101, as shownin FIGURE 4, by allowing a catch projection 103 on the assembly 101 to be inserted into the catch-hole 27.
  • the channeling plate 5 and the shield strips 9, 9 ⁇ can also act as a paper guide to prevent the sprockets 107 from prematurely releasing the paper.
  • the dust shield 1 fixed to the drive sprocket assembly 101, the need for the operator to open and close typical, known sprocket paper hold-down mechanisms is eliminated.
  • the sprocket wheel 105 rotates (counter-clockwise) and the sprockets 107 grab and pull the paper around the wheel assembly 101.
  • the sprockets 107 are partially encased firstly by the channelling plate 5 and, secondly, by the catcher 3, the sprockets passing unimpaired along the channel 7. Paper dust emitted from each hole in the paper tear-off strips falls (generally due to the force of gravity) down the catcher channel region 7 to the channel plate 5.
  • the shield strips 9, 9 ⁇ prevent dust particles from being emitted over the rim of the channel region 7.
  • the channel plate 5 further directs the paper dust particles away from the operational mechanisms of the printer toward the bottom of the sprocket wheel assembly 101 where it can be safely released to fall to the bottom of the printer housing (not shown). If the sprockets 107 enter the paper holes before reaching the position where the sprocket is in the channel region 7 of the catcher 3, dust emitted will fall directly onto the channeling plate 5 and thus be channelled toward the bottom of the printer housing.
  • the paper dust shield could be constructed from many materials.
  • the invention could be made as an integral unit and even as an integral member of a sprocket wheel assembly.
  • the dust shield 1 can be made to be retrofitted to sprocket wheel assemblies by modifying the pin 13 and catch-hole 27 to adapt the dust shield to the particular sprocket wheel assembly in question.

Landscapes

  • Handling Of Sheets (AREA)
  • Accessory Devices And Overall Control Thereof (AREA)

Claims (8)

  1. Un dispositif de protection (1) contre des particules de support d'impression pour une imprimante comportant un ensemble d'entraînement (101) pour faire avancer ledit support d'impression, comprenant :
    - un moyen (3) pour capter lesdites particules émises, en service, par ledit support dans ledit ensemble; et un moyen (5) pour canaliser lesdites particules en éloignement dudit moyen de captage ;
    - caractérisé en ce que le dispositif de protection est fixé sur ou fait partie intégrante de l'ensemble d'entraînement et en ce que ledit moyen de captage (3) comprend :
    . une zone formant canal (7) pour capter initialement et canaliser lesdites particules en direction dudit moyen de canalisation ; et
    . des éléments (9, 9') formant rebords du dispositf de protection le long de chaque bordure supérieure de ladite zone formant canal pour empêcher le passage desdites particules par-dessus lesdites bordures.
  2. Un dispositif de protection selon la revendication 1, comprenant des moyens (5, 9, 9') pour guider ledit support d'impression autour dudit ensemble à roues dentées.
  3. Un dispositif de protection selon la revendication 1 ou la revendication 2, dans lequel ledit moyen de canalisation comprend une feuille métallique plate (5) reliée audit moyen de captage (3) à une extrémité inférieure (17) de ladite zone formant canal (7).
  4. Un dispositif de protection selon une quelconque des revendications 1 à 3, dans lequel ledit moyen de captage (3) entoure partiellement les roues dentées dudit ensemble quand lesdites roues dentées s'engagent dans des trous prévus dans la périphérie dudit support d'impression, en canalisant (5) des particules produites par le contact desdites roues dentées avec ledit support d'impression en éloignement dudit ensemble.
  5. Un dispositif de protection selon la revendication 4, dans lequel ledit moyen de captage est adapté pour empêcher ledit support d'impression de s'écarter par glissement desdites roues dentées lorsque ledit ensemble d'entraînement tourne.
  6. Un ensemble d'entraînement de support d'impression avec roues dentées, lorsqu'il intervient en combinaison avec un dispositif de protection contre des particules tel que revendiqué dans une quelconque des revendications 1 à 5.
  7. Une combinaison telle que revendiquée dans la revendication 6, ou un dispositif de protection tel que revendiqué dans une quelconque des revendications 1 à 5, comprenant des moyens pour fixer le dispositif de protection sur l'ensemble.
  8. Une combinaison telle que revendiquée dans une quelconque des revendications 6 et 7, agencée pour être utilisée avec du papier formant ledit support d'impression.
EP88301676A 1987-03-11 1988-02-26 Couvercle antipoussière pour une imprimante Expired - Lifetime EP0282207B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US2464587A 1987-03-11 1987-03-11
US24645 1987-03-11

Publications (3)

Publication Number Publication Date
EP0282207A2 EP0282207A2 (fr) 1988-09-14
EP0282207A3 EP0282207A3 (en) 1989-02-08
EP0282207B1 true EP0282207B1 (fr) 1992-05-06

Family

ID=21821663

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88301676A Expired - Lifetime EP0282207B1 (fr) 1987-03-11 1988-02-26 Couvercle antipoussière pour une imprimante

Country Status (4)

Country Link
EP (1) EP0282207B1 (fr)
JP (1) JPS63239075A (fr)
CA (1) CA1294237C (fr)
DE (1) DE3870677D1 (fr)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0189124A1 (fr) * 1985-01-25 1986-07-30 Siemens Aktiengesellschaft Dispositif de traitement de documents pour formulaires obtenus à partir d'une bande accordéon sans fin

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3050171A (en) * 1961-05-26 1962-08-21 Teletype Corp Paper exit dust shield
JPS5634474A (en) * 1979-08-31 1981-04-06 Canon Inc Printer

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0189124A1 (fr) * 1985-01-25 1986-07-30 Siemens Aktiengesellschaft Dispositif de traitement de documents pour formulaires obtenus à partir d'une bande accordéon sans fin

Also Published As

Publication number Publication date
JPS63239075A (ja) 1988-10-05
CA1294237C (fr) 1992-01-14
DE3870677D1 (de) 1992-06-11
EP0282207A3 (en) 1989-02-08
EP0282207A2 (fr) 1988-09-14

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