EP0284046B1 - Sheet feeder - Google Patents

Sheet feeder Download PDF

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Publication number
EP0284046B1
EP0284046B1 EP19880104657 EP88104657A EP0284046B1 EP 0284046 B1 EP0284046 B1 EP 0284046B1 EP 19880104657 EP19880104657 EP 19880104657 EP 88104657 A EP88104657 A EP 88104657A EP 0284046 B1 EP0284046 B1 EP 0284046B1
Authority
EP
European Patent Office
Prior art keywords
sheet
feeding
feeding roller
topmost
case
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
Application number
EP19880104657
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0284046A1 (en
Inventor
Nobuharu Yamauchi
Shigeru Sugeta
Hisashi Nakamura
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.)
OFFERTA DI LICENZA AL PUBBLICO
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Publication of EP0284046A1 publication Critical patent/EP0284046A1/en
Application granted granted Critical
Publication of EP0284046B1 publication Critical patent/EP0284046B1/en
Expired 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
    • B41J13/00—Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, specially adapted for supporting or handling copy material in short lengths, e.g. sheets
    • B41J13/10—Sheet holders, retainers, movable guides, or stationary guides
    • B41J13/103—Sheet holders, retainers, movable guides, or stationary guides for the sheet feeding section
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H3/00—Separating articles from piles
    • B65H3/02—Separating articles from piles using friction forces between articles and separator
    • B65H3/06—Rollers or like rotary separators
    • B65H3/0623—Rollers or like rotary separators acting at least during a part of each separation cycle on the articles in a direction opposite to the final separating direction

Definitions

  • the invention relates to a sheet feeder for a printer, according to the pre-characterizing part of claim 1.
  • the present invention relates to a sheet feeder for preventing undesirable plural sheet feeding.
  • DE-A-2 407 098 - from which the present invention starts out - shows a sheet feeder for feeding a topmost sheet of stacked sheets being contained in a sheet case by means of a feeding roller from said sheet case into a portion of a printer, where characters or the like are printed onto said sheet.
  • the feeding roller In order to have a separation of the topmost sheet from the remaining stacked sheets prior to feeding the topmost sheet from the sheet case, the feeding roller first carries out a reverse rotation, so that the topmost sheet is fed into the sheet case causing creation of a bow or curve in said topmost sheet, as the rear end of the sheet abuts against the inner rear surface of the sheet case. Said bow or curve then should separate the topmost sheet from the remaining stacked sheets, so that upon rotation of the feeding roller into feeding direction the topmost sheet is fed out of the sheet case.
  • Subclaim 2 contains an advantageous modification of the invention.
  • FIG.1 shows a sectional view of sheet feeder of an embodiment of the present invention.
  • An ink sheet 8 is conveyed to a take-up reel 10 from a feeding reel 9.
  • a feeding roller 6 is moved so as to touch a top paper 7 (or other kind of sheet) of stacked papers in a paper cartridge 5. Then, the feeding roller 6 is rotated in reverse direction for a small angle as shown in FIG.1, so that the rear end of the paper touches a sheet stopper 14 provided at the rear end of the cartridge 5. Because the end part of the paper 7 is pushed to the sheet stopper, the top sheet is bent as shown in FIG.1. Therefore, the sheets are separated, even in case of close sticking of two or more sheet papers 7.
  • the feeding roller 6 rotates in the forward direction for taking out the separated top paper 7 from the paper cartridge 5.
  • the paper 7, thus taken from the paper cartridge 5, is transferred to a platen roller 2. Further, the paper 7 is transferred to a position which is between the platen roller 2 and a thermal head 1 by means of pinch rollers 3, 4, and is printed with e.g. yellow ribbon. When the yellow print operation is completed, the paper 7 is transferred to a first paper passage 12.
  • the paper 7 is transferred to a second paper passage 13 by reversely rotating the platen roller 2. Then, the paper 7 is printed with e.g. magenta ribbon with rotation of the platen roller 2. Than, e.g. cyan print operation is carried out in the same manner as yellow or magenta print operation.
  • FIG.2 shows a sectional view of the cartridge 5.
  • the paper stopper 14 is provided at the rear end of the cartridge 5.
  • a member 14a having elasticity and large friction in a direct ion of its surface such as any one member of known hook and loop fastener, is provided.
  • FIG.3 is a block diagram of control circuit 15.
  • the control circuit 15 has a driver 22, a controller 20, an output port 38, ROM 32, CPU 34, RAM 36 and an input port 30.
  • the driver 22 is provided for driving a motor 24 for rotating the feeding roller 6.
  • CPU 34 detects the status of the printer by inputting status signals from the input port 30 and controls the controller 20 and the positioning circuit 3 for feeding roller 6 by outputting control signals from the output port 38.
  • CPU 34 controls the printer in accordance with a computer program stored in ROM 32.
  • FIG.5 shows a flow chart of this program.
  • CPU 34 controls the positioning circuit 40 through the output port 38 to issue a command signal to contact the feeding roller 6 to the top sheet (step S1). Then, in step S2, CPU 34 outputs control pulses to the input terminal CU of the controller 20.
  • the controller 20 outputs pulse signals as shown in FIG.4A from output terminals ⁇ 1 , ⁇ 2 , ⁇ 3 and ⁇ 4.
  • the driver 22 outputs signals corresponding to the pulse signals as shown in FIG.4A for driving the stepping motor 24. Therefore, the stepping motor 24 rotates in reverse direction.
  • step S3 CPU 34 outputs control pulses to the input terminal CD of the controller 20.
  • the controller 20 outputs pulse signals as shown in FIG.4B from output terminals ⁇ 1 , ⁇ 2 , ⁇ 3 and ⁇ 4. Therefore, the stepping motor 24 rotates in forward direction.
  • the sheet feeder is applied for a color thermal printer
  • the sheet feeder is applied for mono-color thermal printers or dot-matrix printers (mechanical impact printer).

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Handling Of Cut Paper (AREA)
  • Handling Of Sheets (AREA)
  • Sheets, Magazines, And Separation Thereof (AREA)
EP19880104657 1987-03-27 1988-03-23 Sheet feeder Expired EP0284046B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP46348/87 1987-03-27
JP4634887U JPS63154546U (ru) 1987-03-27 1987-03-27

Publications (2)

Publication Number Publication Date
EP0284046A1 EP0284046A1 (en) 1988-09-28
EP0284046B1 true EP0284046B1 (en) 1991-10-09

Family

ID=12744638

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19880104657 Expired EP0284046B1 (en) 1987-03-27 1988-03-23 Sheet feeder

Country Status (3)

Country Link
EP (1) EP0284046B1 (ru)
JP (1) JPS63154546U (ru)
CA (1) CA1309428C (ru)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TW555651B (en) * 1998-04-14 2003-10-01 Fuji Photo Film Co Ltd Paper feeding cassette printer for use with paper feeding cassette and paper feeding method

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1005090A (en) * 1973-04-18 1977-02-08 Xerox Corporation Reverse buckle sheet feeding apparatus
SE425378B (sv) * 1980-04-25 1982-09-27 Datasaab Ab Sett och anordning for att ur en stapel av arkformiga foremal, exempelvis sedlar, ett och ett uttaga dessa foremal

Also Published As

Publication number Publication date
CA1309428C (en) 1992-10-27
JPS63154546U (ru) 1988-10-11
EP0284046A1 (en) 1988-09-28

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