US20090127777A1 - Sheet feed mechanism of printer, and printer - Google Patents

Sheet feed mechanism of printer, and printer Download PDF

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Publication number
US20090127777A1
US20090127777A1 US12/269,263 US26926308A US2009127777A1 US 20090127777 A1 US20090127777 A1 US 20090127777A1 US 26926308 A US26926308 A US 26926308A US 2009127777 A1 US2009127777 A1 US 2009127777A1
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US
United States
Prior art keywords
sheet
sheet feed
conveying direction
printer
feed roller
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.)
Abandoned
Application number
US12/269,263
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English (en)
Inventor
Toshiyuki Yamamoto
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.)
Alps Alpine Co Ltd
Original Assignee
Alps Electric 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 Alps Electric Co Ltd filed Critical Alps Electric Co Ltd
Assigned to ALPS ELECTRIC CO., LTD. reassignment ALPS ELECTRIC CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: YAMAMOTO, TOSHIYUKI
Publication of US20090127777A1 publication Critical patent/US20090127777A1/en
Abandoned 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
    • 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
    • B41J11/00—Devices or arrangements  of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form
    • B41J11/0065—Means for printing without leaving a margin on at least one edge of the copy material, e.g. edge-to-edge printing
    • 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

Definitions

  • the present invention relates to a sheet feed mechanism of a printer constructed such that a sheet may be conveyed by rotating a sheet feed roller while the sheet is sandwiched between the sheet feed roller and a sheet pressure-contact member, and a printer including the sheet feed mechanism.
  • Thermal printers that make a plurality of heat-generating elements of a thermal head generate heat selectively on the basis of recording information, thereby performing recording on a recording medium, are widely utilized.
  • FIG. 8 A sectional view of major portions in a related-art printer which performs desired recording using a thermosensitive recording medium is shown in FIG. 8 .
  • the printer 1 is disposed in a desired position of a frame, and has a platen roller 2 which is rotationally driven under the transmission of the driving force of a driving motor M.
  • a thermal head 3 is arranged above this platen roller 2 .
  • the thermal printer 1 is a line-type printer in which a plurality of heater elements are aligned and arranged on a metallic substrate in a direction orthogonal in plan view to a conveying direction of a thermosensitive recording medium (hereinafter simply referred to as “sheet”) as a sheet provided for recording is used as this thermal head. At least during recording, the thermal head abuts on the platen roller 2 via the sheet 4 .
  • a color is developed in a predetermined position of the sheet 4 to perform recording, by making each of the heat-generating elements of the thermal head 3 generate heat selectively on the basis of recording information (recording data). Also, during recording, the abutment position where the thermal head 3 abuts on the platen roller 2 via the sheet 4 becomes a recording position PP.
  • the sheet feed roller 6 which is rotationally driven at the same rotating speed as the platen roller 2 under the transmission of the driving force of the driving motor M is arranged on the downstream side (right in FIG. 8 ) in the conveying direction of the recording position PP.
  • a sheet pressure-contact member 10 is arranged above the sheet feed roller 6 via a spring member 12 within the housing 11 for assembling of a printer such that it can press the sheet along with the sheet feed roller 6 , and the sheet 4 pressed by the sheet feed roller 6 by the sheet pressure-contact member 10 is conveyed to the recording position PP along a sheet conveying path with the rotation of the sheet feed roller 6 .
  • a method of making the leading end of a sheet sandwiched between a pair of conveying rollers which are arranged to face the downstream in a sheet conveying direction from a recording position, and performing recording in a state where the pressure contact between a sheet feed roller and a sheet pressure-contact member at the trailing end of the sheet is released to remove the load to the sheet is also considered.
  • a margin equivalent to the distance of a sheet conveyed toward the downstream in the sheet conveying direction from the recording position before the start of recording is formed at the leading end of the sheet on which recording results are formed. Therefore, this method cannot be adopted in a case where recording results in which a margin is not formed are desired.
  • a release mechanism which releases the pressing of the sheet pressure-contact member against the sheet feed roller becomes necessary, and the construction of the printer becomes complicated.
  • An aspect of embodiments of the invention provides a sheet feed mechanism of a printer including a sheet feed roller arranged so as to be rotatable about an axis in a direction orthogonal to a sheet conveying direction in plan view such that its apex is made to face a sheet conveying path on the downstream side in the sheet conveying direction.
  • a sheet pressure-contact member may be arranged to be capable of pressing a sheet against the sheet feed roller.
  • the sheet feed mechanism may also include a sheet trailing end guide portion having a guide surface which gradually guides a trailing end of the sheet released from abutment on the sheet feed roller toward the downstream in the sheet conveying direction.
  • the sheet trailing end guide portion may gradually guide the trailing end of the sheet released from pressure contact with the sheet feed roller, along the guide surface toward the downstream in the sheet conveying direction.
  • an abrupt change in the load applied to a sheet can be suppressed and sheet conveyance unevenness can be reduced. Therefore, generation of poor recording results resulting from an abrupt load change at the time of roller slip-out of the trailing end of a sheet can be prevented.
  • the sheet trailing end guide portion may act uniformly irrespective of the thickness of the sheet.
  • the sheet trailing end guide portion may be formed at least at one of both axial ends of the sheet feed roller so as to project a sheet guide surface constituting the sheet conveying path to be lower than the apex of the sheet feed roller, and so as to project toward the downstream in the sheet conveying direction farther than a downstream end of the sheet feed roller in the sheet conveying direction.
  • the sheet trailing end guide portion may catch the trailing end of the sheet released from pressure contact with the sheet feed roller, in a position which is higher than the sheet guide surface and lower than the apex of the sheet feed roller, and gradually guide it along the guide surface toward the downstream in the sheet conveying direction.
  • a plurality of the sheet feed rollers may be arranged in series in the direction orthogonal to the sheet conveying direction, and one or a plurality of sheet feed rollers corresponding to the width dimensions of sheets are used to convey the sheets, and the sheet trailing end guide portion may be formed at least at one of both axial ends of each of the sheet feed rollers so as to project a sheet guide surface constituting the sheet conveying path to be lower than the apex of each of the sheet feed rollers, and so as to project toward the downstream in the sheet conveying direction farther than a downstream end of each of the sheet feed rollers in the sheet conveying direction.
  • the sheet feed mechanism in a case where the sheet feed mechanism is adopted in a printer which enables recording on a plurality of kinds of sheets having dimensions, i.e., width dimensions, which are made different in the direction orthogonal to the sheet conveying direction, it may be considered that a plurality of sheet feed rollers may be arranged in series in order to correspond to the width dimension of each sheet. Even in this case, the aforementioned operational effects can be obtained by forming a sheet trailing end guide portion at least at one side of both axial ends of each sheet feed roller corresponding to the width dimension of each sheet.
  • the sheet trailing end guide portion may be formed as a circular-arc convex portion in a section in the sheet conveying direction.
  • the trailing end of a sheet can be gradually guided toward the downstream in the sheet conveying direction along the guide surface which inclines substantially obliquely downward in a circular-arc shape in section in the sheet conveying direction, which constitutes the convex portion.
  • a printer may include the sheet feed mechanism having any one of the aforementioned constructions.
  • the sheet feed mechanism can reduce a change in the load to a sheet at the time of roller slip-out, thereby preventing conveyance unevenness of the sheet. Thus, excellent recording can be obtained.
  • a change in the load to a sheet at the time of roller slip-out can be reduced, thereby preventing conveyance unevenness of the sheet, and excellent recording can be obtained.
  • the printer is suitable as a printer which obtains recording results in which a margin is not formed at the leading end of the sheet in the sheet conveying direction.
  • FIG. 1 is a plan view of major portions in a sheet feed mechanism and a printer according to an embodiment of the invention
  • FIG. 2 is a sectional view of exemplary portions in the sheet feed mechanism and the printer according to an embodiment of the invention (a sectional view of the printer taken along a line II-II of FIG. 1 );
  • FIG. 3 is an enlarged explanatory view (a dimensional view) of exemplary portions in the sheet feed mechanism and the printer according to an embodiment of the invention
  • FIG. 4 shows an exemplary arrangement position relationship between a sheet feed roller and sheet trailing end guide portions in the sheet feed mechanism according to an exemplary embodiment
  • FIG. 5 shows an exemplary arrangement position relationship between the sheet feed roller and the sheet trailing end guide portions in the sheet feed mechanism according to an exemplary embodiment
  • FIG. 6 shows an exemplary arrangement position relationship between the sheet feed roller and the sheet trailing end guide portions in the sheet feed mechanism according to an exemplary embodiment
  • FIG. 7 shows an exemplary arrangement position relationship between the sheet feed roller and the sheet trailing end guide portions in the sheet feed mechanism according to an exemplary embodiment
  • FIG. 8 is a sectional view of a sheet feed mechanism and a printer in the related art.
  • a printer including a sheet feed mechanism according to embodiments of the invention will be explained with reference to FIGS. 1 to 7 .
  • embodiments of the sheet feed mechanism which become a characterizing portion of the printer will be explained below.
  • Other components of the printer which are not mentioned may be constructed and act similarly to the aforementioned related-art printer.
  • a printer may be a printer which makes an electrical current applied to heat-generating elements of a thermal head made to abut on a thermosensitive recording sheet (hereinafter referred to as a “sheet”) with a single width dimension, thereby performing desired recording.
  • a thermosensitive recording sheet hereinafter referred to as a “sheet”
  • one rectangular opening 8 for arrangement of a sheet feed roller extending in a direction (this direction is hereinafter referred to as a “width direction”) orthogonal to a sheet conveying direction may be formed in a central portion in the width direction in a sheet guide surface 7 which constitutes a sheet conveying path on the downstream side in the sheet conveying direction in the recording position PP, and also serves as a sheet placement base.
  • the sheet feed roller 6 may be arranged so as to be rotatable about an axis in the direction orthogonal to the sheet conveying direction in plan view such that its apex may be made to project from the opening 8 for arrangement of a sheet feed roller to the sheet guide surface 7 , and may be made to face the sheet conveying path.
  • convex sheet trailing end guide portions 9 which may project lower than the apex of the sheet feed roller 6 from the sheet guide surface 7 , which may project toward the lower end in the sheet conveying direction farther than the downstream end of the sheet feed roller 6 in the sheet conveying direction, and which may have guide surfaces which gradually guide the trailing end of a sheet released from abutment on the sheet feed roller 6 , toward the downstream in the sheet conveying direction from the sheet feed roller 6 may be respectively formed at both ends of the opening 8 for arrangement of a sheet feed roller in the sheet guide surface 7 which become both end sides in the axial direction of the sheet feed roller 6 .
  • the sheet trailing end guide portions 9 may be formed in a circular-arc semi-cylindrical shape in a section in the sheet conveying direction, and may be integrally formed with the sheet guide surface 7 from a resin material in substantially symmetrical positions in the conveying path from the center in the width direction in the conveying path of a sheet 4 .
  • the sheet feed mechanism may be constituted by the sheet feed roller 6 , the sheet trailing end guide portions 9 , and a sheet pressure-contact member 10 arranged via a spring member 12 within the housing 11 for assembling of a printer.
  • the projecting dimension of the sheet trailing end guide portions 9 which projects from the sheet guide surface 7 may be set to 0.3 mm which is large than the sheet thickness, and the projecting dimension of the sheet feed roller 6 which projects from the sheet guide surface 7 may have almost the same dimension as a sum of the projecting dimension of the sheet trailing end guide portions 9 , and the sheet thickness.
  • the projecting dimension may be set to 0.5 to 0.6 mm.
  • a single-cut sheet 4 which may be paid out one by one from the sheet placement portion is brought into pressure contact with the sheet feed roller 6 by the sheet pressure-contact member 10 .
  • the sheet 4 brought into pressure contact with the sheet feed roller 6 by the sheet pressure-contact member may be conveyed toward the downstream in the sheet conveying direction by the frictional force with the sheet feed roller 6 and supplied to a printing position PP, with the rotational driving of the sheet feed roller 6 which may receive the transmission of the driving force of a driving motor M.
  • the sheet 4 may be conveyed by the sheet feed roller 6 , and by the sheet pressure-contact member 10 which makes pressure contact with the sheet feed roller 6 via the sheet 4 , it may be possible to form desired recording, without providing a margin at the leading end of the sheet 4 . That is, in the printing position PP, the leading end of the sheet 4 may be sandwiched between the platen roller 2 and the thermal head 3 , and an electric current may be selectively applied to the heat-generating elements of the thermal head 3 made to abut on the sheet 4 , in accordance with the conveyance of the sheet 4 by the rotative force of the sheet feed roller 6 , thereby performing desired recording from the leading end of the sheet. Simultaneously with this, the sheet may be conveyed toward the downstream in the sheet conveying direction by the rotation of the platen roller 2 which is rotationally driven in synchronization with the sheet feed roller 6 under the transmission of the driving force of the driving motor M.
  • the pair of sheet trailing end guide portions 9 may catch the trailing end of the sheet released from the pressure contact with the sheet feed roller 6 in a position which may be higher than the sheet guide surface 7 and lower than the apex of the sheet feed roller 6 , and then gradually may guide the trailing end of the sheet 4 conveyed by the rotational driving of the platen roller 2 , along the circular-arc guide surface toward the downstream in the sheet conveying direction. Thereafter, the sheet 4 conveyed by the rotational driving of the platen roller 2 may be subjected to desired recording in the recording position PP, and may be ejected from the sheet conveying path.
  • the sheet trailing end guide portions 9 may act uniformly irrespective of the thickness of the sheet 4 .
  • the sheet trailing end guide portions 9 may be formed in the substantially symmetrical positions within the conveying path from the center in the width direction in the conveying path of the sheet 4 .
  • the sheet maybe caught by the sheet trailing end guide portions 9 in the symmetrical positions from the center in the width direction of the sheet 4 . Therefore, an abrupt load change can be reduced substantially uniformly and surely in the width direction of the sheet 4 . That is, an abrupt load change can be reduced more substantially uniformly and surely in the width direction of the sheet 4 than the end of the sheet is caught in a cantilevered shape on one side of the sheet 4 , by the sheet trailing end guide portions 9 .
  • the sheet feed roller 6 may be arranged so as to be split into a plurality of pieces in the width direction, and the sheet trailing end guide portions 9 may be arranged on both sides of each sheet feed roller 6 .
  • one sheet trailing end guide portion 9 may be arranged between two adjacent sheet feed rollers 6 , as shown in FIG. 5 .
  • the trailing end guide portions 9 may not be formed on both sides of the sheet feed roller 6 , respectively, but only one trailing end guide portion may be arranged between two adjacent rollers 6 (fourth embodiment).
  • a plurality of sheet trailing end guide portions 9 may be formed in the width direction of the sheet 4 rather than forming one sheet trailing end guide portion.
  • the plurality of sheet trailing end guide portions 9 may be arranged with the same dimension and at equal intervals in the width direction of the sheet 4 . This is because an abrupt load change can be reduced substantially uniformly and surely in the width direction of the sheet 4 .
  • a plurality of the sheet feed rollers 6 which vary in axial dimension may be arranged in series in a direction orthogonal to the sheet conveying direction in order to correspond to the width dimensions of sheets 4 expected to be used, and one or a plurality of sheet feed rollers 6 corresponding to the width dimensions of the sheets 4 may be used to convey the sheets 4 .
  • a plurality of the sheet feed rollers 6 which vary in axial dimension may be arranged in series in a direction orthogonal to the sheet conveying direction in order to correspond to the width dimensions of sheets 4 expected to be used, and one or a plurality of sheet feed rollers 6 corresponding to the width dimensions of the sheets 4 may be used to convey the sheets 4 .
  • three sheet feed rollers 6 including a sheet feed roller 6 A made to correspond to a sheet 4 A, a sheet feed roller 6 B used simultaneously with the sheet feed roller 6 A and made to correspond to the sheet 4 E, and a sheet feed roller 6 C used simultaneously with the sheet feed rollers 6 A and 6 B, and made to correspond to the sheet 4 C may be arranged in series in the direction orthogonal to the sheet conveying direction.
  • the sheet feed roller 6 A may be located within the sheet conveying paths of the sheet 4 A, the sheet 4 E, and the sheet 4 C
  • the sheet feed roller 6 B may be located within the sheet conveying paths of the sheet 4 B and the sheet 4 C
  • the sheet feed roller 6 C may be located only within the sheet conveying path of the sheet 4 C.
  • this embodiment is similar to the aforementioned embodiments in that the sheet feed rollers 6 A, 6 B, and 6 C may be arranged such that their apexes may be made to project from openings 8 A, 8 B, and 8 C for arrangement of sheet feed rollers, which may be formed in the sheet guide surface 7 , corresponding to the sheet feed rollers, respectively, and the sheet end guide portions 9 may be arranged aside the sheet feed rollers 6 A, 6 B, and 6 C in the width direction.
  • the printer has been described using a printer which performs desired recording on a thermosensitive recording medium.
  • the sheet feed mechanism of the embodiments of the invention can be applied to a thermal printer using ink sheets, etc.
  • the shape of the sheet trailing end guide portions is not limited to the circular-arc semi-cylindrical shape in a section in the sheet conveying direction like the aforementioned embodiment.
  • the guide surface may be an inclined surface which is not circular-arc but flat.

Landscapes

  • Delivering By Means Of Belts And Rollers (AREA)
  • Handling Of Continuous Sheets Of Paper (AREA)
  • Sheets, Magazines, And Separation Thereof (AREA)
  • Feeding Of Articles By Means Other Than Belts Or Rollers (AREA)
  • Handling Of Cut Paper (AREA)
US12/269,263 2007-11-15 2008-11-12 Sheet feed mechanism of printer, and printer Abandoned US20090127777A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2007296699A JP4943997B2 (ja) 2007-11-15 2007-11-15 プリンタの給紙機構およびプリンタ
JP2007-296699 2007-11-15

Publications (1)

Publication Number Publication Date
US20090127777A1 true US20090127777A1 (en) 2009-05-21

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US12/269,263 Abandoned US20090127777A1 (en) 2007-11-15 2008-11-12 Sheet feed mechanism of printer, and printer

Country Status (4)

Country Link
US (1) US20090127777A1 (ja)
EP (1) EP2060400B1 (ja)
JP (1) JP4943997B2 (ja)
CN (1) CN101434153B (ja)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20190092055A1 (en) * 2017-09-27 2019-03-28 Ds Global Paper feeding device for printer

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6052364B2 (ja) * 2015-10-01 2016-12-27 三菱レイヨン株式会社 水性被覆材及び塗装物
CN106926588B (zh) * 2017-03-31 2018-10-26 汕头高新区炬盛科技有限公司 一种热转印打印机

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Publication number Priority date Publication date Assignee Title
US4306713A (en) * 1980-04-25 1981-12-22 International Business Machines Corporation Document feeder
US4589650A (en) * 1983-09-28 1986-05-20 Mita Industrial Co., Ltd. Paper feeding device
US5083766A (en) * 1989-07-19 1992-01-28 Nisca Corporation Automatic sheet feeding device having a miniaturized structure

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JPH07261484A (ja) * 1994-03-25 1995-10-13 Tec Corp 給紙装置
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JP2000118888A (ja) * 1998-10-13 2000-04-25 Canon Aptex Inc 自動原稿送り装置及びこれを備えた画像形成装置
JP2002265080A (ja) * 2001-03-06 2002-09-18 Canon Inc 自動給紙装置、画像読取装置及び画像形成装置
JP2003212384A (ja) * 2002-01-28 2003-07-30 Fuji Photo Film Co Ltd 画像記録装置
JP4321130B2 (ja) 2003-06-18 2009-08-26 セイコーエプソン株式会社 印刷装置、及び印刷装置の制御方法
JP2005343659A (ja) * 2004-06-04 2005-12-15 Canon Inc シート給送装置及び画像形成装置
JP2006259525A (ja) * 2005-03-18 2006-09-28 Fuji Xerox Co Ltd 画像形成装置
JP2007083500A (ja) 2005-09-21 2007-04-05 Canon Inc 記録装置
JP2007106551A (ja) * 2005-10-13 2007-04-26 Ricoh Co Ltd 記録媒体搬送装置、スキャナ装置および画像形成装置
JP4612896B2 (ja) * 2006-02-09 2011-01-12 キヤノン株式会社 シート給送装置及び記録装置
JP4572344B2 (ja) * 2006-03-09 2010-11-04 セイコーエプソン株式会社 被記録媒体給送装置、記録装置、液体噴射装置
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US4306713A (en) * 1980-04-25 1981-12-22 International Business Machines Corporation Document feeder
US4589650A (en) * 1983-09-28 1986-05-20 Mita Industrial Co., Ltd. Paper feeding device
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20190092055A1 (en) * 2017-09-27 2019-03-28 Ds Global Paper feeding device for printer

Also Published As

Publication number Publication date
JP2009120338A (ja) 2009-06-04
EP2060400B1 (en) 2016-02-17
EP2060400A2 (en) 2009-05-20
JP4943997B2 (ja) 2012-05-30
CN101434153B (zh) 2011-12-07
CN101434153A (zh) 2009-05-20
EP2060400A3 (en) 2009-12-23

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Legal Events

Date Code Title Description
AS Assignment

Owner name: ALPS ELECTRIC CO., LTD., JAPAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:YAMAMOTO, TOSHIYUKI;REEL/FRAME:021821/0449

Effective date: 20080902

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION