EP2060400B1 - Mécanisme d'alimentation de feuille d'un imprimante, et imprimante - Google Patents
Mécanisme d'alimentation de feuille d'un imprimante, et imprimante Download PDFInfo
- Publication number
- EP2060400B1 EP2060400B1 EP08017834.6A EP08017834A EP2060400B1 EP 2060400 B1 EP2060400 B1 EP 2060400B1 EP 08017834 A EP08017834 A EP 08017834A EP 2060400 B1 EP2060400 B1 EP 2060400B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- sheet
- sheet feed
- feed roller
- printer
- trailing end
- 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 - Fee Related
Links
Images
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 according to the preamble of claim 1.
- This mechanism is constructed such that a sheet is conveyed by rotating a sheet feed roller while the sheet is sandwiched between the sheet feed roller and a sheet pressure-contact member. It also relates to 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 3 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 abut 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.
- US 5 893 556 A discloses a sheet feed mechanism according to the preamble of claim 1.
- a regulating member is disposed on a downstream side of a sheet forward roller and a pinch roller.
- Said regulating member guides the front end and the back end of the sheet and it also acts as a guide member to maintain the distance between the sheet and an ink jet head constant.
- the regulating member (sheet trailing end guide portion) extends over the overall width of the sheet and the sheet feed roller.
- the regulating member is offset in the downstream direction with respect to said pinch roller.
- US 2007/252883 A1 discloses a mechanism in which plural guide rollers are provided at a downstream side of a feeding roller, wherein such guide rollers are disposed above a flat rear sheet guide.
- a sheet feed mechanism of a printer including the features of claim 1.
- the sheet trailing end guide portion gradually guides 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.
- the sheet trailing end guide portion is 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 catches 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 guides 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.
- 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
- a plurality of sheet feed rollers are arranged in series in order to correspond to the width dimension of each sheet.
- 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 is 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 includes 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.
- 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 of the aspect of the invention including such a sheet feed mechanism, it is possible to exhibit an excellent effect that 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.
- 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 of the invention which become a characterizing portion of the printer of the invention will mainly explained below.
- Other components of the printer which are not mentioned shall be constructed and act similarly to the aforementioned related-art printer.
- a printer of a first embodiment of the invention is 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 is 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 is 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 is made to project from the opening 8 for arrangement of a sheet feed roller to the sheet guide surface 7, and is made to face the sheet conveying path.
- convex sheet trailing end guide portions 9 which project lower than the apex of the sheet feed roller 6 from the sheet guide surface 7, which 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 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 are 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 are formed in a circular-arc semi-cylindrical shape in a section in the sheet conveying direction, and are 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 in this embodiment is 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 is 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 preferably has 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 is set to 0.5 to 0.6 mm.
- a single-cut sheet 4 which is 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 is 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 receives the transmission of the driving force of a driving motor M.
- the sheet 4 is 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 is 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 is sandwiched between the platen roller 2 and the thermal head 3, and an electric current is 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 is 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 catches the trailing end of the sheet released from the pressure contact with the sheet feed roller 6 in a position which is higher than the sheet guide surface 7 and lower than the apex of the sheet feed roller 6, and then gradually guides 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 is subjected to desired recording in the recording position PP, and is ejected from the sheet conveying path.
- the sheet trailing end guide portions 9 are 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 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 (second embodiment).
- one sheet trailing end guide portion 9 may be arranged between two adjacent sheet feed rollers 6, as shown in Fig. 5 (third embodiment).
- the trailing end guide portions 9 are not 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 be formed in the width direction of the sheet 4 rather than forming one sheet trailing end guide portion. It is more preferable that the plurality of sheet trailing end guide portions 9 being 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 are 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 (fifth embodiment).
- a plurality of the sheet feed rollers 6 which vary in axial dimension are 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 (fifth embodiment).
- three sheet feed rollers 6 including a sheet feed roller 6A made to correspond to a sheet 4A, a sheet feed roller 6B used simultaneously with the sheet feed roller 6A and made to correspond to the sheet 4B, and a sheet feed roller 6C used simultaneously with the sheet feed rollers 6A and 6B, and made to correspond to the sheet 4C are arranged in series in the direction orthogonal to the sheet conveying direction.
- the sheet feed roller 6A is located within the sheet conveying paths of the sheet 4A, the sheet 4B, and the sheet 4C
- the sheet feed roller 6B is located within the sheet conveying paths of the sheet 4B and the sheet 4C
- the sheet feed roller 6C is located only within the sheet conveying path of the sheet 4C.
- this embodiment is similar to the aforementioned embodiments in that the sheet feed rollers 6A, 6B, and 6C are arranged such that their apexes are made to project from openings 8A, 8B, and 8C for arrangement of sheet feed rollers, which are formed in the sheet guide surface 7, corresponding to the sheet feed rollers, respectively, and the sheet end guide portions 9 are arranged aside the sheet feed rollers 6A, 6B, and 6C 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)
Claims (4)
- Mécanisme d'alimentation en feuilles d'une imprimante comprenant :une surface de guidage de feuille constituant un chemin de transport de feuille ;un rouleau d'alimentation en feuilles (6) agencé de manière à être rotatif autour d'un axe dans une direction orthogonale à une direction de transport de feuille en vue en plan de sorte que son sommet se trouve en face d'un chemin de transport de feuille du côté aval dans la direction de transport de feuille ;un élément de contact par pression de feuille (10) agencé pour être capable de presser une feuille (4) contre le rouleau d'alimentation en feuilles (6) ; etune partie de guidage d'extrémité arrière de feuille (9) ayant une surface de guidage qui attrape une extrémité arrière de la feuille libérée de son appui sur le rouleau d'alimentation en feuilles (6) dans une position qui est plus haute que la surface de guidage de feuille et plus basse que le sommet du rouleau d'alimentation en feuilles (6) et qui guide progressivement l'extrémité arrière de la feuille (4) vers l'aval dans la direction de transport de feuille,caractérisé en ce que la partie de guidage d'extrémité arrière de feuille (9) est formée au moins à l'une des deux extrémités axiales du rouleau d'alimentation en feuilles (6) de manière à faire saillie sur la surface de guidage de feuille et à faire saillie vers l'aval dans la direction de transport de feuille davantage qu'une extrémité aval du rouleau d'alimentation en feuilles (6) dans la direction de transport de feuille, et la partie de guidage d'extrémité arrière de feuille (9) a la forme d'une partie convexe en arc de cercle dans une section dans la direction de transport de feuille.
- Mécanisme d'alimentation en feuilles d'une imprimante selon la revendication 1, caractérisé en ce qu'une pluralité de rouleaux d'alimentation en feuilles (6) sont disposés en série dans la direction orthogonale à la direction de transport de feuille, et un ou une pluralité de rouleaux d'alimentation en feuilles (6) correspondant aux dimensions de largeur des feuilles sont utilisés pour transporter les feuilles (4).
- Mécanisme d'alimentation en feuilles d'une imprimante selon la revendication 1 ou 2, caractérisé en ce que la dimension de saillie du rouleau d'alimentation en feuilles qui fait saillie sur la surface de guidage de feuille a presque la même dimension qu'une somme de la dimension de saillie des parties de guidage d'extrémité arrière de feuille (9) et de l'épaisseur de feuille.
- Imprimante pourvue du mécanisme d'alimentation en feuilles selon l'une quelconque des revendications 1, 2 et 3.
Applications Claiming Priority (1)
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 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP2060400A2 EP2060400A2 (fr) | 2009-05-20 |
EP2060400A3 EP2060400A3 (fr) | 2009-12-23 |
EP2060400B1 true EP2060400B1 (fr) | 2016-02-17 |
Family
ID=40279014
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08017834.6A Expired - Fee Related EP2060400B1 (fr) | 2007-11-15 | 2008-10-10 | Mécanisme d'alimentation de feuille d'un imprimante, et imprimante |
Country Status (4)
Country | Link |
---|---|
US (1) | US20090127777A1 (fr) |
EP (1) | EP2060400B1 (fr) |
JP (1) | JP4943997B2 (fr) |
CN (1) | CN101434153B (fr) |
Families Citing this family (3)
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 |
KR102131940B1 (ko) * | 2017-09-27 | 2020-07-09 | 디에스글로벌(주) | 프린터의 급지장치 |
Family Cites Families (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4306713A (en) * | 1980-04-25 | 1981-12-22 | International Business Machines Corporation | Document feeder |
JPS6071437A (ja) * | 1983-09-28 | 1985-04-23 | Mita Ind Co Ltd | 給紙搬送装置 |
US5083766A (en) * | 1989-07-19 | 1992-01-28 | Nisca Corporation | Automatic sheet feeding device having a miniaturized structure |
JP3098369B2 (ja) * | 1993-12-15 | 2000-10-16 | キヤノン株式会社 | シート給送装置及び記録装置 |
JPH07261484A (ja) * | 1994-03-25 | 1995-10-13 | Tec Corp | 給紙装置 |
JPH08333026A (ja) * | 1995-06-09 | 1996-12-17 | Seiko Epson Corp | プリンタ |
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 |
JP2006182033A (ja) * | 2006-03-28 | 2006-07-13 | Ricoh Co Ltd | インクジェット記録装置及び画像形成装置 |
JP4847204B2 (ja) | 2006-04-28 | 2011-12-28 | ゼブラ株式会社 | 複式筆記具 |
-
2007
- 2007-11-15 JP JP2007296699A patent/JP4943997B2/ja active Active
-
2008
- 2008-10-10 EP EP08017834.6A patent/EP2060400B1/fr not_active Expired - Fee Related
- 2008-10-15 CN CN2008101700265A patent/CN101434153B/zh active Active
- 2008-11-12 US US12/269,263 patent/US20090127777A1/en not_active Abandoned
Also Published As
Publication number | Publication date |
---|---|
EP2060400A2 (fr) | 2009-05-20 |
CN101434153B (zh) | 2011-12-07 |
EP2060400A3 (fr) | 2009-12-23 |
JP2009120338A (ja) | 2009-06-04 |
CN101434153A (zh) | 2009-05-20 |
US20090127777A1 (en) | 2009-05-21 |
JP4943997B2 (ja) | 2012-05-30 |
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