DK163648B - Method and device for print quality control - Google Patents
Method and device for print quality control Download PDFInfo
- Publication number
- DK163648B DK163648B DK249985A DK249985A DK163648B DK 163648 B DK163648 B DK 163648B DK 249985 A DK249985 A DK 249985A DK 249985 A DK249985 A DK 249985A DK 163648 B DK163648 B DK 163648B
- Authority
- DK
- Denmark
- Prior art keywords
- symbol
- writing
- signal
- sensing means
- circuit
- Prior art date
Links
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
- B41J29/38—Drives, motors, controls or automatic cut-off devices for the entire printing mechanism
- B41J29/393—Devices for controlling or analysing the entire machine ; Controlling or analysing mechanical parameters involving printing of test patterns
Landscapes
- Accessory Devices And Overall Control Thereof (AREA)
- Particle Formation And Scattering Control In Inkjet Printers (AREA)
- Ink Jet (AREA)
Description
DK 163648 BDK 163648 B
Opfindelsen angår en fremgangsmåde og et apparat til ved hjælp af et fotofølsomt affølingsorgan at kontrollere skrivekvaliteten af fortrinsvis matrix- eller blækstråleskrivere .The invention relates to a method and apparatus for controlling the writing quality of preferably matrix or inkjet printers by means of a photosensitive sensing means.
5 Ved skrivning med matrixskrivere er læseligheden bl.a. afhængigt af farvebåndets tilstand, og af at skrivehovedets samtlige skriveelementer er i funktion. Særligt iøjnefaldende problemer ved kontrol af disse funktioner foreligger, hvor skrivere anvendes uden kontinuerligt til-10 syn. Eksempler herpå er skriveapparater, som datamaskinestyret arbejder på visse tider af døgnet og bankdatamaskiner, som udskriver besked om udførte transaktioner.5 When writing with matrix printers, readability includes: depending on the condition of the ink ribbon and the fact that all of the print head of the print head are in operation. Particularly noticeable problems in controlling these features are those where printers are used without continuous supervision. Examples include typewriters that the computer manager operates at certain times of the day and bank computers that print out transactions performed.
Der findes forskellige metoder til at kontrollere skrivekvaliteten af matrixskrivere. Eksempelvis beskrives 15 i PCT-ansøgning WO 82/1163 et apparat til ved hjælp af optiske sensorer, som følger med skrivehovedet, at detektere hvert punkt, som trykkes. Resultatet af detekteringen sammenlignes i en datamaskine med et signalmønster svarende til det trykte tegn. Ved afvigelse fra signalmønstret 20 afgives et fejlsignal. Apparatet er også bestemt til anvendelse ved blækstråleskrivere. Eftersom de to vigtigste faktorer, der påvirker skrivekvaliteten, er farvebåndets tilstand og skriveelementernes funktion er apparatet ifølge ovenfor nævnte patentskrift en unødvendig kompliceret 25 og kostbar løsning. Opfindelsen angår en fremgangsmåde som angivet i den indledende del af krav 1, hvilken fremgangsmåde er ejendommelig ved det i samme kravs kendetegnende del angivne. Opfindelsen angår endvidere et apparat som angivet i indledningen til krav 2, hvilket apparat er ejendommeligt 30 ved det i samme kravs kendetegnende del angivne.There are various methods to check the writing quality of matrix printers. For example, in PCT application WO 82/1163, an apparatus for detecting each point being printed is described by means of optical sensors supplied with the printhead. The result of the detection is compared in a computer with a signal pattern corresponding to the printed character. By deviation from signal pattern 20, an error signal is output. The apparatus is also intended for use with inkjet printers. Since the two most important factors affecting the writing quality are the condition of the ink ribbon and the operation of the writing elements, the apparatus of the above-mentioned patent specification is an unnecessarily complicated and costly solution. The invention relates to a method as defined in the preamble of claim 1, which is characterized by the characterizing part of the same claim. The invention further relates to an apparatus as set forth in the preamble of claim 2, which apparatus is peculiar to the characterizing part of the same claim.
Med den foreliggende opfindelse opnås en enkel og effektiv kontrol af skrivekvaliteten af en matrixskriver eller blækstråleskriver. Dette udføres ved at hver skriveelement samtidigt skriver et punktmønster inden for et om-35 rådet af papiret, hvori ingen normal skrivning sker. I forbindelse med linieskift aflæser et fotofølsomt kredsløb detThe present invention provides a simple and effective control of the print quality of a matrix or inkjet printer. This is accomplished by each writing element simultaneously writing a dot pattern within an area of the paper in which no normal writing occurs. In line switching, a photosensitive circuit reads it
DK 163648 BDK 163648 B
2 skrevne mønster. De herved frembragte signaler bearbejdes og sammenlignes med et forudbestemt signalmønster, som svarer til en korrekt skrivekvalitet. Afvigelse mellem disse mønstre aktiverer et alarmkredsløb.2 written pattern. The resulting signals are processed and compared to a predetermined signal pattern corresponding to a correct writing quality. Deviation between these patterns activates an alarm circuit.
5 Opfindelsen forklares i det følgende nærmere under henvisning til tegningen, på hvilken fig. 1 skematisk viser de dele af en matrixskriver, som er af interesse i forbindelse med opfindelsen, og fig. 2 viser de indgående elektriske kredsløb.5 The invention will now be explained in more detail with reference to the drawing, in which: FIG. 1 is a schematic view of the parts of a matrix printer of interest in the invention; and FIG. 2 shows the incoming electrical circuits.
10 Fig. 1 viser skematisk et skrivepapir 1 med tegn, som er blevet trykt ved hjælp af et skrivehovede 2 af ma-trixskrivertype. Skrivehovedet har i skrivepapirets venstre margen også trykt et punktmønster 3 for hver skrivelinie. Mønstret er udformet som en punktrække vinkelret 15 på skrivehovedets bevægelsesretning og er tilvejebragt af skrivehovedets samtlige skriveelementer. Et optisk af-følingsorgan 4 er anbragt på en sådan måde, at punktmønstret 3 ved linieskift passerer under affølingsorganet 4.FIG. 1 schematically shows a writing paper 1 with characters which has been printed by means of a print head 2 of the matrix printer type. The print head has also printed a dot pattern 3 for each line of writing in the left margin of the writing paper. The pattern is designed as a point line perpendicular to the direction of movement of the printhead and is provided by all the printheads of the printhead. An optical sensing means 4 is arranged in such a way that the dot pattern 3 passes by line change under the sensing means 4.
Fig. 2 viser i større enkeltheder et apparat iføl-20 ge den foreliggende opfindelse. Det optiske affølingsorgan 4 omfatter en lysdiode 7, som belyser skrivepapiret under en fotodioderække 8 forsynet med et skifteregister af eksempelvis fabrikat EG&G Reticon RL128G. Ved linieskift passerer punktrækken 3 i pilen P's retning forbi fotodioderækken 8, 25 hvor dioderne med en indbyrdes afstand på 25 /im er anbragt vinkelret på punktrækken 3's bevægelsesretning. Ved hjælp af skifteregisteret aflæses hver diode i rækkefølge med en hastighed, som bestemmes af et i en datamaskine 6 indgående styreorgan 12. I dette tilfælde er styreorganets klok-30 frekvens blevet valgt til 50 kHz og eksempleringsfrekven-sen til 300 Hz, hvilket giver en skanderingstid på 2,56 ms og ca. 12 skanderinger pr. punkt i punktmønstret 3. Signalet fra hver fotodiode føres til et sammenligningsorgan 5, hvor det forstærkes i en jævnspændingsforstærker F og 35 sammenlignes med spændingen fra en referencespændingskilde R i en differentialforstærker D. Signaler med højere 3FIG. 2 shows in greater detail an apparatus according to the present invention. The optical sensing means 4 comprises a light emitting diode 7, which illuminates the writing paper under a photodiode array 8 provided with a shift register of, for example, EG&G Reticon RL128G. In a line change, the dot line 3 in the direction of arrow P passes past the photodiode array 8, 25 where the diodes with a spacing of 25 µm are placed perpendicular to the direction of the dot 3. By means of the shift register, each diode is read in sequence at a rate determined by a control means 12 included in a computer 6. In this case, the clock frequency of the control means has been set to 50 kHz and the sample frequency to 300 Hz, which gives a scan time of 2.56 ms and approx. 12 scans per point of the dot pattern 3. The signal from each photodiode is fed to a comparator 5 where it is amplified in a DC amplifier F and 35 is compared to the voltage of a reference voltage source R in a differential amplifier D. Higher 3 signals
DK 163648 BDK 163648 B
OISLAND
amplitude end referencespændingen tildeles et ettal i differentialforstærkeren, mens signaler med lavere amplitude tildeles et nul. De digitaliserede signaler aflæses af datamaskinen 6, hvor en tæller 9 i overensstemmelse med giv-5 ne betingelser adderer alle éttaller. En betingelse kan eksempelvis være, at mindst fire konsekutive éttaller kræves for at tælleren skal addere disse. Efter tre aflæsninger af samtlige dioder uden at ovennævnte betingelse er blevet opfyldt, aflæses tælleren, hvorefter den nulstil-10 les. En betingelse for at et punkt skal registreres ved punktmønstrets 3 passage forbi affølingsorganet er, at tælleren 9 adderer eksempelvis 40 ettaller. I et register 10 sammenlignes antallet af registrerede punkter med antallet af skriveelementer i skrivehovedet 2. Ved afvigel-15 se mellem disse antal påvirkes et signalkredsløb 11, som afgiver et alarmsignal.amplitude than the reference voltage is assigned one in the differential amplifier while signals with lower amplitude are assigned a zero. The digitized signals are read by the computer 6, where a counter 9, in accordance with the given conditions, adds all numbers. For example, one condition may be that at least four consecutive integers are required for the counter to add these. After three readings of all diodes without the above condition being fulfilled, the counter is read off and then reset. A condition for a point to be recorded at the passage of the point pattern 3 past the sensing means is that the counter 9 adds, for example, 40 ones. In a register 10, the number of registered points is compared with the number of write elements in the printhead 2. When deviating between these numbers, a signal circuit 11 which gives an alarm signal is affected.
20 25 30 3520 25 30 35
Claims (5)
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE8305478 | 1983-10-05 | ||
SE8305478A SE439132B (en) | 1983-10-05 | 1983-10-05 | PRINT QUALITY CONTROL SET AND DEVICE |
SE8400321 | 1984-09-28 | ||
PCT/SE1984/000321 WO1985001476A1 (en) | 1983-10-05 | 1984-09-28 | A method and device for printing quality control |
Publications (4)
Publication Number | Publication Date |
---|---|
DK249985A DK249985A (en) | 1985-06-03 |
DK249985D0 DK249985D0 (en) | 1985-06-03 |
DK163648B true DK163648B (en) | 1992-03-23 |
DK163648C DK163648C (en) | 1992-08-17 |
Family
ID=20352776
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DK249985A DK163648C (en) | 1983-10-05 | 1985-06-03 | PRINCIPLE AND PRINT QUALITY CONTROL APPARATUS |
Country Status (10)
Country | Link |
---|---|
EP (1) | EP0157851B1 (en) |
JP (1) | JPH0653426B2 (en) |
CA (1) | CA1266710A (en) |
DE (1) | DE3468371D1 (en) |
DK (1) | DK163648C (en) |
ES (1) | ES536508A0 (en) |
FI (1) | FI81303C (en) |
IT (1) | IT1176886B (en) |
SE (1) | SE439132B (en) |
WO (1) | WO1985001476A1 (en) |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB8621335D0 (en) * | 1986-09-04 | 1986-10-15 | Roneo Alcatel Ltd | Printing devices |
US5173850A (en) * | 1988-02-12 | 1992-12-22 | Hitachi, Ltd. | Apparatus and method for checking print quality of turnaround medium |
JP3049663B2 (en) * | 1991-02-20 | 2000-06-05 | キヤノン株式会社 | Recording device and recording method |
DE69214508T2 (en) * | 1991-05-14 | 1997-03-13 | Canon Kk | Pressure estimation method and apparatus |
JP3229431B2 (en) * | 1992-05-28 | 2001-11-19 | キヤノン株式会社 | Patent application title: RECORDING DEVICE AND METHOD OF JUDGING RECORDING STATE OF RECORDING DEVICE |
US5397192A (en) * | 1993-11-01 | 1995-03-14 | Hewlett-Packard Company | Shuttle-type printers and methods for operating same |
JPH08127139A (en) * | 1994-10-31 | 1996-05-21 | Nec Field Service Ltd | Dot impact serial printer |
AUPN232795A0 (en) * | 1995-04-12 | 1995-05-04 | Eastman Kodak Company | Detection of faulty nozzles in printing heads |
US6542622B1 (en) * | 1999-08-30 | 2003-04-01 | Eastman Kodak Company | Methods and articles for determining invisible ink print quality |
US9333783B1 (en) * | 2015-07-13 | 2016-05-10 | Toshiba Tec Kabushiki Kaisha | Printer apparatus |
US20230286308A1 (en) * | 2020-07-21 | 2023-09-14 | Hewlett-Packard Development Company, L.P. | Print control |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5910311B2 (en) * | 1977-04-19 | 1984-03-08 | 沖電気工業株式会社 | dot printer |
US4339208A (en) * | 1980-09-25 | 1982-07-13 | Ncr Corporation | Optical sensing of wire matrix printers |
-
1983
- 1983-10-05 SE SE8305478A patent/SE439132B/en not_active IP Right Cessation
-
1984
- 1984-09-28 WO PCT/SE1984/000321 patent/WO1985001476A1/en active IP Right Grant
- 1984-09-28 DE DE8484903675T patent/DE3468371D1/en not_active Expired
- 1984-09-28 EP EP84903675A patent/EP0157851B1/en not_active Expired
- 1984-09-28 JP JP59503648A patent/JPH0653426B2/en not_active Expired - Lifetime
- 1984-10-03 CA CA000464672A patent/CA1266710A/en not_active Expired
- 1984-10-04 ES ES536508A patent/ES536508A0/en active Granted
- 1984-10-05 IT IT23040/84A patent/IT1176886B/en active
-
1985
- 1985-05-13 FI FI851883A patent/FI81303C/en not_active IP Right Cessation
- 1985-06-03 DK DK249985A patent/DK163648C/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
DK249985A (en) | 1985-06-03 |
EP0157851A1 (en) | 1985-10-16 |
FI81303C (en) | 1990-10-10 |
JPH0653426B2 (en) | 1994-07-20 |
ES8601018A1 (en) | 1985-10-16 |
IT1176886B (en) | 1987-08-18 |
DK163648C (en) | 1992-08-17 |
FI81303B (en) | 1990-06-29 |
IT8423040A0 (en) | 1984-10-05 |
FI851883A0 (en) | 1985-05-13 |
IT8423040A1 (en) | 1986-04-05 |
SE8305478L (en) | 1985-04-06 |
EP0157851B1 (en) | 1988-01-07 |
DK249985D0 (en) | 1985-06-03 |
WO1985001476A1 (en) | 1985-04-11 |
CA1266710A (en) | 1990-03-13 |
JPS61500110A (en) | 1986-01-23 |
FI851883L (en) | 1985-05-13 |
ES536508A0 (en) | 1985-10-16 |
SE439132B (en) | 1985-06-03 |
SE8305478D0 (en) | 1983-10-05 |
DE3468371D1 (en) | 1988-02-11 |
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Legal Events
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PBP | Patent lapsed |