GB2160063A - Printing system for page printer - Google Patents

Printing system for page printer Download PDF

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Publication number
GB2160063A
GB2160063A GB08514061A GB8514061A GB2160063A GB 2160063 A GB2160063 A GB 2160063A GB 08514061 A GB08514061 A GB 08514061A GB 8514061 A GB8514061 A GB 8514061A GB 2160063 A GB2160063 A GB 2160063A
Authority
GB
United Kingdom
Prior art keywords
page
printing
sheet
data
printing system
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.)
Granted
Application number
GB08514061A
Other versions
GB8514061D0 (en
GB2160063B (en
Inventor
Akira Ukawa
Nobuo Ueda
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 GB8514061D0 publication Critical patent/GB8514061D0/en
Publication of GB2160063A publication Critical patent/GB2160063A/en
Application granted granted Critical
Publication of GB2160063B publication Critical patent/GB2160063B/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/32—Circuits or arrangements for control or supervision between transmitter and receiver or between image input and image output device, e.g. between a still-image camera and its memory or between a still-image camera and a printer device
    • H04N1/32609—Fault detection or counter-measures, e.g. original mis-positioned, shortage of paper
    • H04N1/32625—Fault detection
    • H04N1/32635—Fault detection of reproducing apparatus or receiver, e.g. out of paper
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K15/00—Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/32—Circuits or arrangements for control or supervision between transmitter and receiver or between image input and image output device, e.g. between a still-image camera and its memory or between a still-image camera and a printer device
    • H04N1/32358—Circuits or arrangements for control or supervision between transmitter and receiver or between image input and image output device, e.g. between a still-image camera and its memory or between a still-image camera and a printer device using picture signal storage, e.g. at transmitter
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/32—Circuits or arrangements for control or supervision between transmitter and receiver or between image input and image output device, e.g. between a still-image camera and its memory or between a still-image camera and a printer device
    • H04N1/32609—Fault detection or counter-measures, e.g. original mis-positioned, shortage of paper
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/32—Circuits or arrangements for control or supervision between transmitter and receiver or between image input and image output device, e.g. between a still-image camera and its memory or between a still-image camera and a printer device
    • H04N1/32609—Fault detection or counter-measures, e.g. original mis-positioned, shortage of paper
    • H04N1/32646—Counter-measures
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K2215/00—Arrangements for producing a permanent visual presentation of the output data
    • G06K2215/0002—Handling the output data
    • G06K2215/0077—Raster outputting to the print element(s)
    • G06K2215/008—Raster outputting to the print element(s) from more than one raster memory
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K2215/00—Arrangements for producing a permanent visual presentation of the output data
    • G06K2215/0082—Architecture adapted for a particular function
    • G06K2215/0085—Error recovery
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N2201/00—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof
    • H04N2201/0077—Types of the still picture apparatus
    • H04N2201/0082—Image hardcopy reproducer
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N2201/00—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof
    • H04N2201/32—Circuits or arrangements for control or supervision between transmitter and receiver or between image input and image output device, e.g. between a still-image camera and its memory or between a still-image camera and a printer device
    • H04N2201/3285—Circuits or arrangements for control or supervision between transmitter and receiver or between image input and image output device, e.g. between a still-image camera and its memory or between a still-image camera and a printer device using picture signal storage, e.g. at transmitter
    • H04N2201/3288—Storage of two or more complete document pages or image frames

Abstract

A printing system for controlling a page printer 28 for printing one full page at a time includes a plurality of page memories 23a...d for temporarily storing print data for respective pages transferred from a master controller. For printing successive pages, sheets of print paper are successively introduced into the page printer, and sensors (15-18, Figs 1 and 4) sense their passage through the printer. The print data from the master controller are successively stored in the page memories and remain stored therein until they are successfully printed on the respective sheets. When data can not be printed due to a fault such as a paper jam detected by the sensors, the data is held in the memories until the fault is cleared, whereupon printing restarts at the page at which the fault occurred. <IMAGE>

Description

SPECIFICATION Printing system for page printer The present invention relates to a page printer for printing one full page at a time, and more particularly to a printing system for controlling apage printer to increase the rate of printing operation after a fault such as a paper jam has been cleared.
Page printers print characters at a time in a full page format based on printing data transferred from a master controller. The page printer starts printing a next page after the discharge of a proceeding printed page has been confirmed. When it is desired to print a succession of pages, sheets of print paper are successively introduced into the printer without waiting for respective printed pages to be discharged in order to reduce the time required to effect the entire printing operation, i.e. to increase the rate of printing operation.
When a sheet of print paper is jammed in the page printer, the data will be retransmitted from the master controller from the first page again after the jammed sheet is removed from the page printer.
Therefore, the efficiency of the transmission circuit is poor. Since sheets are printed again from the first page, identical pages may be produced which may make the user confused. Inasmuch as the data is retransmitted from the master controller from the first page, the data of which still, remains in the page printer, the page printer is required to be coupled to the master controller through a complex interface, and the transmission circuit is poor in efficiency.
It is an object of the present invention to provide a printing system for page printers which is capable of printing sheets again without imposing a burden on a master controller after any fault such as a paper jam has been cleared.
Another object of the present invention is to provide a printing system for page printers which, after a fault has been cleared, is capable of starting printing pages from the data of pages that have been caused by the fault to be left unprinted, without retransmission from a master controller, thereby improving the efficiency of a transmission circuit.
Still another object of the present invention is to provide a printing system for page printers which is capable of printing a plurality of sheets successively at a high printing speed.
According to the present invention, a printing system for a page printer for printing one full page at a time has page memories capable of storing the data of a maximum number of pages that can be introduced into the page printer. The printing system additionally has at least one page memory for storing the data of one page, in addition to the page memories corresponding to the pages introducible in the page printer, to enable the page printerto start printing the page which has failed to be properly printed completely due to a fault such as a paper jam, after the fault has been cleared.Therefore, only by adding at least one page memory to an existing printing system it can utilize a transmission circuit coupled to a master controller highly efficiently without imposing a burden on the master controller, and the cost of communication with the master controller is reduced. The printing system enables the page printer easily to clear a fault such as a paper jam and also to print a plurality of sheets at a higher speed, if desired.
The above and other objects, features and advantages of the present invention will become more apparent from the following description when taken in conjunction with the accompanying drawings in which a preferred embodiment of the present invention is shown by way of illustrative example.
Figure 1 is a schematic side elevational view of a printing mechanism controlled by a printing system according to the present invention; Figure 2 is a block diagram of the arrangement of a printing system of the present invention; Figure 3 is a timing chart explanatory of operation of the printing system illustrated in Figure 2; and Figure 4 is a schematic view showing the relationship between sheets of print paper and sensors in the printing mechanism shown in Figure 1.
Figure 1 shows a printing mechanism in a page printer for printing one full page at a time, the printing mechanism comprising an electrophotographic recording system employing a laser as a light source.
The printing mechanism includes a sheet cassette 1 for supplying sheets of print paper, a popping roller 2 for drawing one sheet at a time from the sheet cassette 1, feed rollers 3,4 for feeding the sheet along through the printing mechanism, and discharge rollers 5 for discharging the sheet from the printing mechanism.The printing mechanism also comprises a cylindrical photosensitive body 6 rotatable about its own axis, a charger 7 for charging the photosensitive body 6 to make it photosensitive, a light writing unit 8 having a laser for exposing the photosensitive body 6 to form an electrostatic latent image thereon, a developing unit 9 for developing the electrostatic latent image with toner into a visible toner image, an image transfer unit 10 for electrostatically attracting the toner image to a sheet to thereby transfer the toner image to the sheet, a fixing unit 11 for fixing the toner to the sheet, an erase lamp 12 for erasing an electrostatic latent image from the photosensitive body 6, and a cleaning unit 13 for removing any residual toner which remains without being transferred to the sheet from the photosensitive body 6.The printing mechanism additionally includes a sheet tray 14 for receiving thereon discharged sheets printed by the printing mechanism, a sensor 15 for detecting whether a sheet is drawn from the sheet cassette 1 or detecting whether, after one sheet has been drawn from the sheet cassette 1, a next sheet can be drawn therefrom, a sensor 16 for detecting a timing to start a printing cycle and monitoring the manner in which sheets are fed along, a sensor 17 for monitoring the manner in which sheets are fed along, and a sensor 18 for monitoring the manner in which sheets are fed along and also for detecting whether printed sheets are properly discharged from the print mechanism.
Figure 2 shows in a block form a printing system for controlling the printing mechanism. The printing system generally designated art 26, includes an interface 20 to be connected to a master controller for sending data to and receiving data from the master controller, a microcomputer system 21, a program memory 22 for storing a program to control operation of the printing system 26, a plurality of page memories 23a through 23d for storing printing data supplied from the master controller as edited data for respective pages, a font memory 24 for storing characters as divided into dots, and a interface control unit 25 for being coupled to the printing mechanism.A printing mechanism control unit 27 serves as an interface to be coupled to the printing system 26 and also serves to control the printing mechanism, denoted at 28, which is of a construction as shown in Figure 1 for printing one page at a time.
Operation of the page printer for printing pages one at a time will be described with reference to Figures 3 and 4.
Figure 3 is a timing chart of operation for printing pages based on printing data supplied from the master controller. The data from the master controller for a first page is received through the interface 20, edited by the microcomputer system 21, and then successively stored into the page memory 23a.
After the microcomputer system 21 has properly received the data for one page, the microcomputer system 21 commands the interface 20 to issue a normal reception signal or a next page data request signal to the master controller, and receives the data for a second page from the master controller. The second-page data is similarly edited, and successively stored into the page memory 23b. Likewise, the data for a third page is stored into the page memory 23c, and the data for a fourth page is stored into the page memory 23d. After one-page data have been edited, the interface control unit 25 is instructed by the microcomputer system 21 to command the printing mechanism control unit 27 to draw a sheet from the sheet cassette 1. The printing mechanism control unit 27 then controls the print mechanism 28 to drive the popping roller 2 for supply one sheet from the sheet cassette 1.The printing mechanism control unit 27 then issues a request for printing data to the interface control unit 25 while monitoring the running condition of the sheet with the sensors 15, 16. In response to the printing data request, the microcomputer system 21 reads from the font memory 24 dot data which have produced by dividing character data stored in the page memory 23a, edits one line or one dot line of dot data, and delivers the edited dot data through the interface control unit 25 to the printing mechanism control unit 27. Based on the delivered dot data, the printing mechanism control unit 27 controls a laser beam corresponding to each dot in the light writing unit 8 in the printing mechanism 28 to form an electrostatic latent image on the photosensitive body 6. The electrostatic latent image is then developed into a toner image which is transferred to the sheet.When the printing mechanism control unit 27 detects the absence of the first-page sheet with the sensor 15 in the printing mechanism 28, the printing mechanism control unit 27 issues a signal indicating that a second-page sheet can be drawn from the sheet cassette 1 to the interface control unit 25. If the second-page data have been edited for storage into the page memory 23b at this time, then the printing mechanism control unit 27 controls the popping roller 2 to draw a second-page sheet from the sheet cassette 1. Similarly, third and fourth-page sheetsare drawn from the sheet cassette 1, and the data stored in the page memories 23c, 23d is printed respectively on the third and fourth-page sheets.When the toner images transferred from the photosensitive body 6 are successively fixed to the sheets by the fixing unit 11 and the printed sheets are successively moved past the sensor 18, the printing mechanism control unit 27 issues signals indicative of proper discharge of the printed sheets to the interface control unit 25. Then, the microcomputer system 21 uses the respective page memories for storing data for new pages from the master controller. More specifically, since there are four page memories 23a through 23d in the illustrated embodiment, when the first-page data from the page memory 23a is properly printed and the printed sheet is discharged, the page memory 23a is then employed for the storage of the data of a fifth page.While in the illustrated embodiment the page memories store the data from the master controller as edited in character codes, the received data may directly be stored in the page memories, or may be stored as edited in dot patterns.
Figure 4 shows the relationship between sheets in the printing mechanism of Figure 1 and the sensors 15 through 18. Designated at 19a through 19d are respective sheets of print paper, and the arrow G indicates the direction in which the sheets are fed along through the printing mechanism. The sensors 15 through 18 co-operate with the microcomputer system 21 in confirming the feeding of each sheet through the printing mechansim, detecting the time ing to start a printing cycle, and confirming the discharge of each sheetfrom the printing mechanism. The sensors 15 through 18 are also capable of detecting a paper jam.For example, if no sheet arrives at the position of the sensor 15 even upon elapse of a prescribed time regardless of the issuance of a command for drawing a sheet from the sheet cassette 1, then the microcomputer system 21 determines, through time monitoring, that a paper jam has occurred in a zone A or that the sheet has not been properly drawn from the sheet cassette 1. If no sheet reaches the position of the sensor 16 upon elapse of a prescribed time regardless of the detection of a sheet by the sensor 15, then the microcomputer system 21 determines, through time monitoring, that a paper jam has occurred in a zone B. If no sheet passes the sensor 15 within a prescribed time, then the microcomputer system 21 determines that a paper jam has occurred between the zones A and B by measuring the difference between the times when the leading and trailing ends of a sheet passes the sensor 15. Likewise, the sensors 16 through 18 detect paper jams between the zone B and a zone C, in the zone C, between the zone, C and a zone D, in the zone D, and between the zone D and a zone E.
Where a maximum of three sheets can be introduced into the page printer at a time as shown in Figure 4, a total of four page memories are provided in the printing system. While three sheets are running through the printing mechanism 28, the print data for a sheet to be drawn next from the sheet cassette 1 are edited to increase the printing speed. In the block diagram of Figure 2, there are four page memories 23a through 23d for storing the data of four pages.
It is now assumed that while the data of first through four pages are being received from the master controller during printing operation, the sheet 1 9c for the third page is jammed between the zone B and C in the printing mechanism. At this time, the printing mechanism 28 contains therein the sheet 1 9b for the second page which has not yet been properly discharged out of the printing mechanism 28, and the sheet 1 9d for the fourth page has already started to be drawn from the sheet cassette 1. Then, the operator removes the sheets for the second through fourth pages from the printing mechanism 28, and pushes a switch, not shown, or closes the cover of the printing mechanism 28 which has been opened for sheet removal.The pushed button or closed cover enables the microcomputer system 21 to detect the removal of the paper jam, and the microcomputer system 21 controls the printing mechanism 28 to start printing again the stored print data on successive sheet from the second page on. Since the data for the second page which has not yet been discharged properly from the printing mechanism 28 still remain stored in the page memory, the second-page data and the data of successive data can start to be printed again without their being retransmitted from the master controller.
While in the illustrated embodiment there are page memories one more than the pages introducible in the printing mechanism, the printing system may contain more page memories.
Although a certain preferred embodiment has been shown and described, it should be understood that many changes and modifications may be made therein without departing from the scope of the appended claims.

Claims (4)

1. A printing system for controlling a page printer for printing print data transferred from a master controller on a sheet in one full page format at a time, said printing system comprising: a) a plurality of page memories for temporarily storing print data for respective pages: b) a plurality of sensors disposed along a path of feed of the sheet for detecting conditions in which the sheet is fed along said path.
c) the arrangement being such that the pring data is held in said page memories until properly printed on respective sheets, and print data starting to be printed on sheets from a page which has failed to be properly printed completely due to a fault detected by one of said sensors, after the fault has been cleared.
2. A printing system according to claim 1, including at least one page memory in addition to said page memories corresponding to a maximum number of pages which can be introduced at a time in said page printer.
3. A printing system according to claim 1 or 2 in combination with a laser printer.
4. A printing system substantially as hereinbefore described with reference to the accompanying drawings.
GB08514061A 1984-06-04 1985-06-04 Printing system for page printer Expired GB2160063B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP59113041A JPS60257262A (en) 1984-06-04 1984-06-04 Printing system of page printer

Publications (3)

Publication Number Publication Date
GB8514061D0 GB8514061D0 (en) 1985-07-10
GB2160063A true GB2160063A (en) 1985-12-11
GB2160063B GB2160063B (en) 1988-03-30

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Family Applications (1)

Application Number Title Priority Date Filing Date
GB08514061A Expired GB2160063B (en) 1984-06-04 1985-06-04 Printing system for page printer

Country Status (3)

Country Link
JP (1) JPS60257262A (en)
DE (1) DE3520075A1 (en)
GB (1) GB2160063B (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0229659A2 (en) * 1986-01-13 1987-07-22 Hitachi, Ltd. Information processing system having decod; write and read means
DE3629462A1 (en) * 1986-08-29 1988-03-03 Agfa Gevaert Ag METHOD AND DEVICE FOR ELECTRONIC IMAGE PROCESSING WITH INTERMEDIATE STORAGE
WO1991005432A1 (en) * 1989-10-02 1991-04-18 Eastman Kodak Company Reproduction apparatus operation during malfunction recovery
EP0531062A2 (en) * 1991-09-05 1993-03-10 Canon Kabushiki Kaisha Facsimile apparatus

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Publication number Priority date Publication date Assignee Title
JPS62200869A (en) * 1986-02-28 1987-09-04 Toshiba Corp Facsimile equipment
JPS62207068A (en) * 1986-03-07 1987-09-11 Toshiba Corp Facsimile equipment
JPS6335343A (en) * 1986-07-30 1988-02-16 Mita Ind Co Ltd Data reception control method
JPS6353632A (en) * 1986-08-22 1988-03-07 Fuji Xerox Co Ltd Restoring method for printer error
JP2839246B2 (en) * 1986-09-12 1998-12-16 富士通株式会社 Printer control method
JP2770907B2 (en) * 1987-12-18 1998-07-02 株式会社日立製作所 Control method of double-sided printing printer and print control device
JP3048575B2 (en) * 1988-01-07 2000-06-05 ミノルタ株式会社 Printer control device
JP2745514B2 (en) * 1988-01-07 1998-04-28 ミノルタ株式会社 Printer control device
JPH01202467A (en) * 1988-02-09 1989-08-15 Fujitsu Ltd Paper jamming recovery system in printer device
JP2840333B2 (en) * 1989-10-31 1998-12-24 株式会社リコー Image formation control device
JP2902442B2 (en) * 1989-11-10 1999-06-07 旭光学工業株式会社 Continuous paper printer
GB2241404A (en) * 1990-02-21 1991-08-28 Ricoh Kk Control device for a digital copier
JPH03247481A (en) * 1990-02-27 1991-11-05 Fujitsu Ltd Controlling method for recovery from jam of printer
US5664074A (en) 1990-10-30 1997-09-02 Hitachi, Ltd. Print control apparatus with error recovery function and its print control method
JP2731315B2 (en) * 1992-03-17 1998-03-25 富士通株式会社 Printer device
DE19655062B4 (en) * 1995-01-13 2004-12-30 Fuji Xerox Co., Ltd. Printing device with a paper processing function

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Publication number Priority date Publication date Assignee Title
US4026543A (en) * 1975-11-28 1977-05-31 International Business Machines Corporation Document article handling control

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0229659A2 (en) * 1986-01-13 1987-07-22 Hitachi, Ltd. Information processing system having decod; write and read means
EP0229659A3 (en) * 1986-01-13 1988-01-27 Hitachi, Ltd. Information processing system having decod; write and read means
US4809215A (en) * 1986-01-13 1989-02-28 Hitachi, Ltd. Information processing system having decode, write and read means
DE3629462A1 (en) * 1986-08-29 1988-03-03 Agfa Gevaert Ag METHOD AND DEVICE FOR ELECTRONIC IMAGE PROCESSING WITH INTERMEDIATE STORAGE
DE3629462C2 (en) * 1986-08-29 1996-05-15 Agfa Gevaert Ag Method and device for electronic image processing with intermediate storage
WO1991005432A1 (en) * 1989-10-02 1991-04-18 Eastman Kodak Company Reproduction apparatus operation during malfunction recovery
EP0531062A2 (en) * 1991-09-05 1993-03-10 Canon Kabushiki Kaisha Facsimile apparatus
EP0531062B1 (en) * 1991-09-05 1997-07-09 Canon Kabushiki Kaisha Facsimile apparatus

Also Published As

Publication number Publication date
GB8514061D0 (en) 1985-07-10
DE3520075C2 (en) 1992-02-13
GB2160063B (en) 1988-03-30
DE3520075A1 (en) 1985-12-05
JPS60257262A (en) 1985-12-19

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Date Code Title Description
PE20 Patent expired after termination of 20 years

Effective date: 20050603