EP0104337A2 - Dispositif pour amener une à une des feuilles sur la platine d'une machine de bureau - Google Patents

Dispositif pour amener une à une des feuilles sur la platine d'une machine de bureau Download PDF

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Publication number
EP0104337A2
EP0104337A2 EP83106902A EP83106902A EP0104337A2 EP 0104337 A2 EP0104337 A2 EP 0104337A2 EP 83106902 A EP83106902 A EP 83106902A EP 83106902 A EP83106902 A EP 83106902A EP 0104337 A2 EP0104337 A2 EP 0104337A2
Authority
EP
European Patent Office
Prior art keywords
transport rollers
roller
control element
magazine
sheet
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.)
Withdrawn
Application number
EP83106902A
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German (de)
English (en)
Other versions
EP0104337A3 (fr
Inventor
Helmut Steinhilber
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0104337A2 publication Critical patent/EP0104337A2/fr
Publication of EP0104337A3 publication Critical patent/EP0104337A3/fr
Withdrawn legal-status Critical Current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

Definitions

  • the invention relates to a device for the individual feeding of sheets stored in a magazine to the platen roller of an office machine with a separating roller, which at least during the separation frictionally engages the uppermost of the sheets stored in the magazine, with a pair of transport rollers that come from the magazine Transporting sheets to the platen roller, the separating roller and the transport rollers being drivable by a gear through the platen roller when they are rotating in the sheet feed direction, and the sheets coming from the magazine being in a precise starting position for the feed by a control element driven by the platen roller at the entry nip of the transport rollers the platen roller is stopped.
  • Üromaschinen be at typewriters, automatic data printers and other written B often used on these machines be placed magazines containing stacked sheets to be processed.
  • the sheets are automatically pulled out of the magazine and fed to the platen roller.
  • it is known to drive these devices by rotating the platen.
  • the sheets reach the platen while the platen is rotating and are drawn in immediately by the platen.
  • the sheets therefore do not have a precisely defined starting position for the feed through the platen roller, as is necessary for printing the sheets precisely to the line.
  • a device of the type mentioned is known. So that the sheets do not get undefined into the feed nip of the platen roller, in this device a stop which can be pivoted into the transport path of the sheets is provided and which gives the front edge of the sheets a defined starting position on the transport rollers. For the sheet feed, this stop is pivoted out of the transport path in a controlled manner by the platen roller, so that the sheets are released and conveyed to the platen roller by the transport rollers. In the gear train, which reduces the driving force of the platen roller, a slip clutch is provided which interrupts the feed of the sheets as long as they are in contact with the stop.
  • the separating roller has an overrunning freewheel that pulls off the sheets made possible by the transport rollers under the separating rollers under pressure on the stack. Furthermore, an idle path is provided in the gear train, which prevents undesired feeding of the next sheet if the platen roller z. B. for formula writing is turned back a few line steps.
  • the stop that can be swiveled out of the transport route and its control, the slip clutch, the overrunning clutch and the free travel provided in the gear train make this device structurally complex.
  • the pivoting out of the stop and overcoming the friction of the slipping clutch are at the expense of the driving force of the platen roller, so that malfunctions occur with a drive force of the platen roller that is often very small.
  • the invention has for its object to provide a device for automatically feeding sheets from the magazine, which is structurally simple, requires as little driving force of the platen and allows easy control by the platen.
  • control element is a member of the gear unit driving the singling roller and the transport rollers, that the control element has a peripheral portion which comes into positive tooth engagement with the singling roller, that the control element over its entire circumference except for a gap with one the transport rollers are in positive engagement with the tooth, that the gap is located in a peripheral region of the control element, which is offset by the transport path of the sheet from the magazine to the transport rollers towards the beginning of the peripheral section, and that a device is provided which prevents the transport rollers from rotating prevents them from meshing with the control in the area of the gap.
  • the drive of the separating roller and the transport rollers as well as their control and also the exact positioning of the sheet for line-accurate feeding by the platen are effected by a single control element which is driven by the platen.
  • the control element only engages with the separating roller during a short period of its rotation. Only during this short period of time is the separating roller driven and pulls the top sheet from the stack stored in the magazine and advances it to the nip of the transport rollers.
  • the entire remaining time of the circulating cycle of the control element is not in engagement with the separating roller, so that it can be freely rotated in both directions of rotation. For pulling off the sheet and The cler frictionally changing the stack of the singling roll is therefore not necessary to overhaul the singling roll.
  • the platen roller can be rotated back and forth in any manner during the writing process without the separating roller being driven. An empty path in the gear train between the platen roller and the separating roller is therefore not necessary.
  • the transport rollers are driven by the control element during its entire circulation cycle, except for a period of time which is associated with the arrival of the sheet pulled and fed from the singling roll and the duration of which corresponds to the tolerances of this arrival caused by slipping when the sheet is fed by the singling roll.
  • the transport rollers are thus at a standstill when the sheet that has been pulled from the magazine is fed through the separation roller to the entry nip of the transport rollers. Regardless of inaccuracies at the time of this arrival, which are caused by the slippage during the feed by the singling roller, the sheet therefore takes an exact starting position at the entry gap of the transport rollers when they are again at a precisely defined point in time by the control element for feeding the sheet 'Platen roller driven.
  • the transport rollers thus simultaneously take on the function of a stop, which precisely defines the starting position of the sheet for line-by-line feeding.
  • a swing-away stop which requires additional design effort and additional driving force, is superfluous. Since the sheet is only fed through the separating roller until it is inserted at the entry nip of the transport rollers, a slip clutch is also not necessary.
  • the control element is advantageously dimensioned in such a way that the sheet is advanced by the separating roller a somewhat greater distance than the path to the entry gap of the transport rollers until the transport rollers are driven again.
  • the sheet pre-inserted at the entry nip of the transport rollers is bulged somewhat, so that its front edge is positioned exactly in the entry nip under slight internal tension.
  • slight differences caused by slippage in the transport path of the sheet through the separating rollers are compensated.
  • a locking mechanism is preferably provided which engages with the transport rollers for the duration of this period and holds them. This avoids, on the one hand, that the positioning of the blade becomes inaccurate, and, on the other hand, an exact intervention of the drive control element and the transport rollers is ensured after this period.
  • the positive engagement of the drive control element with the separating roller and with the transport rollers guarantees an exact slip-free drive and an exact synchronization of the control processes. Since the separation roller and the transport rollers are driven by the same drive control element, an exact mutual synchronization of the movements of the separation roller and the transport roller is inevitable without additional measures.
  • the transport rollers Since the sheet is conveyed by the platen roller on the one hand and on the other hand by the transport rollers during the feed, the transport rollers have at least the same peripheral speed as the platen roller. The transport rollers thus hinder a turning back of the platen during the writing process, for. B. not for formula writing.
  • the control element has the effect that the trailing rear edge of the sheet drawn in by the platen roller has left the transport rollers and these can be stopped by the gap in the drive of the drive control element until the leading edge of the subsequent sheet fed by the separating roller arrives at the entry nip of the transport rollers.
  • the device takes up only a small part of the driving force of the platen.
  • the freely rotating separating roller does not hinder the removal of the single sheet from the stack by the transport rollers.
  • the device is structurally extremely simple and inexpensive to manufacture.
  • the control element can be designed as a single plastic wheel, which brings about the various drive and control interventions by means of different toothings.
  • the positive drive engagement can also by toothed belt, by a chain drive, such as. B. caused by link chains or ball chain or by a perforated tape.
  • the drive engagement with the separating roller and with the transport rollers can be brought about by various gear wheels which are connected to one another by reduction gears. Even if the embodiment with a single wheel is the simplest in terms of construction, other embodiments may be different. U. prove to be expedient for reasons of space or the like.
  • Fig. 1 only the platen roller 10 and schematically the print head 12 is shown of the writing office machine.
  • the device for automatically feeding sheets that can be placed on the office machine has a housing 14 with side walls 16, which is hung into the office machine with recesses 18 on the edges of the side walls 16.
  • the dead weight of the device is taken up by a support wheel 20 that is supported on the platen roller 10 in a frictionally locking manner or preferably with positive tooth engagement.
  • An almost vertically standing magazine 22 is inserted into the housing 14, in which the sheet-like recording media to be printed, usually paper sheets 24, are stored in stacks.
  • the stack of sheets 24 is supported on its rear side by a plate 26 which can be pivoted in the magazine and which is acted upon by compression springs 28.
  • the separating roller 32 consists of a plurality of roller bodies which are arranged on a common shaft in a rotationally fixed manner and which act on the uppermost sheet 24 of the stack with a friction surface.
  • the singling roller 32 rotates clockwise (in FIG. 1), the top sheet 24 of the stack is pushed down and jumps over the singling corners 30, so that it is pulled out of the magazine singly.
  • the transport rollers 36 and 38 likewise consist of a plurality of roller bodies with a frictional surface that are seated in a rotationally fixed manner on a common shaft.
  • One transport roller 36 can be driven in a manner explained later, while the other transport roller 38 is pressed under the action of a tension spring 40 against the transport roller 36 and rotates freely with it.
  • the sheet which passes between the transport rollers 36 and 38 and is conveyed by it reaches a shaft formed by the guide plate 34 and a further guide plate 42, which leads to the feed nip of the platen roller 10.
  • the support wheel 20 driven by the platen roller 10 transmits the rotary movement of the platen roller 10 to a drive control element via a gear consisting of gear wheels 44, 46 and 48.
  • the gear 46 also drives ejection rollers 50, which convey the printed sheet coming from the platen roller 10 into a tray, not shown.
  • the drive control element is a wheel 52 which has different toothings on its circumference in axially offset planes, as is also shown in the sectional view in FIG. 2.
  • the wheel 52 In an axially central plane, the wheel 52 has a toothing 54 that is completely closed over the entire circumference.
  • the toothed wheel 46 engages in this toothing 54 so that the wheel 52 is driven continuously by the platen roller 10.
  • a toothed circumferential section 56 is provided on an end face of the wheel 52, which extends only over a short area of the circumference of the wheel 52; in the exemplary embodiment in FIG. 1, this is a circumferential section of approximately 30 °.
  • the toothed circumferential section 56 comes with a corresponding angular position of the wheel 52 with a toothing 58 provided on the shaft of the separating roller 32 in engagement.
  • the separating roller 32 is driven clockwise, in the paper feed direction, when the platen roller is driven in the paper feed direction (clockwise in FIG. 1).
  • a toothing 60 is provided axially following the toothing 54 on the circumference of the wheel 52.
  • the toothing 60 extends almost over the entire circumference of the wheel 52 and has only one gap 62, which extends over a small angular range example of approximately 20 ° extends.
  • the gap 62 is offset on the wheel 52 with respect to the toothed peripheral portion 56 by an angle which corresponds approximately to the angle between the separating roller 32 and the transport rollers 36 and 38.
  • the toothing 60 engages in a toothing 64 of the shaft of the transport roller 36, so that the transport roller 36 is driven by the platen roller 10 via the wheel 52.
  • the toothing 64 of the transport roller disengages from the toothing 60 of the wheel 52.
  • the freely rotatably mounted transport roller 36 is disengaged during the period in which its toothing 64 is disengaged in the area of the gap 62, as shown in FIG. 3 locking system shown enlarged against rotation.
  • the locking mechanism corresponds to the locking mechanism of a Maltese cross and consists of a cylinder section 66 axially attached to the end face of the wheel 52, the cylinder radius of which corresponds approximately to the outer radius of the toothing 60.
  • the transport roller 36 axially adjoins the toothing 64 in the same plane as the cylinder section 66 has a collar with concave recesses 68, the radius of curvature of which corresponds to the radius of curvature of the cylinder section 66.
  • the cylinder section 66 pushes into the concave recess 68 without play and slides along it until the end of the gap 62 is reached is.
  • the transport roller 36 is held against rotation for the duration of the gap 62. It also ensures that at the end of the gap 62, when the cylinder section 66 has been pushed completely out of the recess 68, the toothings 66 and 64 come back into exact tooth engagement.
  • the gear formed by the support wheel 20, the gears 44, 46 and 48, the wheel 52 and the toothing 64 of the transport roller 36 is dimensioned such that the peripheral speed of the platen roller 10 is equal to or less than the peripheral speed of the transport roller 36 and that the platen roller 10 and the transport roller 36 have the same direction of rotation.
  • the circumferential length of the toothed circumferential section 56 and the toothing 58 of the separating roller 32 are dimensioned such that the separating roller 32 is rotated by the circumferential section 56 by an amount such that it pulls a sheet 24 from the stack in the magazine 22 until the entry gap of the transport rollers 36 and 38 and bulges a little more.
  • the angular offset between the peripheral portion 56 and the gap 62 is dimensioned such that the transport roller 36 is located in the region of the gap 62 and is held in place by the locking mechanism when the front edge of the sheet 24 arrives at the entry nip of the transport rollers 36, 38.
  • the sheet can be advanced so far by the separating roller 32 that it bulges and is under the pressure of its own elasticity in the entry nip of the transport rollers 36 and 38 without these being able to rotate. Different feed movements caused by a slippage between the separating roller 32 and the sheet 24 are only manifested to a different extent in the bulge.
  • the peripheral section 56 and the toothing 58 of the separating roller 32 disengage and the toothing 64 of the transport roller 36 comes into engagement with the toothing 60 at the end of the gap 62.
  • the transport rollers 36 and 38 are driven and convey the sheet 24 to the platen roller 10 at a precisely defined starting time and a precisely defined starting position, so that an exact line positioning for printing on the sheet is ensured. Since the peripheral speed of the platen roller 10 is not greater than that of the transport rollers 36 u. 38 the sheet is drawn in without slip from the platen roller. The rear part of the sheet is pulled off under the singling roller 32, which rotates freely and does not hinder the sheet from being pulled off.
  • the wheel 52 makes almost a full revolution.
  • the peripheral portion 56 can again engage and drive the separating roller 32 so that the next sheet is pulled from the stack of the magazine.
  • the gap 62 of the toothing 60 reaches the transport roller 36, so that its drive is interrupted and the transport rollers 36 and 38 are stopped by the locking mechanism.
  • An axially projecting display section 70 is provided on the wheel 52 approximately diametrically opposite the toothed peripheral section 56.
  • the angular arrangement and the angular extent of the display section 70 are selected such that it rotates past a viewing window 72 in the front wall of the housing 14 during the rotation of the wheel 52, as long as the peripheral section 56 is in engagement with the separating roller 32. This provides the operator with a control facility to prevent the magazine 22 from being inserted into the device with a new stack of paper while the peripheral portion 56 is engaged with the singling roller 32. This would lead to an incomplete separation and feed process by the separation roller 32 on the first sheet of the stack and thus to a malfunction.

Landscapes

  • Sheets, Magazines, And Separation Thereof (AREA)
  • Handling Of Cut Paper (AREA)
  • Paper Feeding For Electrophotography (AREA)
EP83106902A 1982-08-31 1983-07-14 Dispositif pour amener une à une des feuilles sur la platine d'une machine de bureau Withdrawn EP0104337A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19823232275 DE3232275C2 (de) 1982-08-31 1982-08-31 Vorrichtung zum vereinzelten Zuführen von Blättern zur Schreibwalze einer Büromaschine
DE3232275 1982-08-31

Publications (2)

Publication Number Publication Date
EP0104337A2 true EP0104337A2 (fr) 1984-04-04
EP0104337A3 EP0104337A3 (fr) 1985-07-17

Family

ID=6172091

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83106902A Withdrawn EP0104337A3 (fr) 1982-08-31 1983-07-14 Dispositif pour amener une à une des feuilles sur la platine d'une machine de bureau

Country Status (4)

Country Link
EP (1) EP0104337A3 (fr)
JP (1) JPS5957835A (fr)
DD (1) DD216422A5 (fr)
DE (1) DE3232275C2 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0237077A3 (en) * 1986-03-14 1990-01-10 Nec Corporation Cut sheet feeding mechanism
EP0338578A3 (en) * 1988-04-21 1990-03-28 Mitsubishi Denki Kabushiki Kaisha Paper feeder for printer
CN107101859A (zh) * 2017-05-26 2017-08-29 郭晓斌 标本载附滤纸条自动递送装置

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3416342C2 (de) * 1984-05-03 1986-09-04 Helmut 7210 Rottweil Steinhilber Vorrichtung zum automatischen Zuführen von Einzelblättern aus einem Magazin zur Schreibwalze einer Büromaschine
DE3442915A1 (de) * 1984-11-24 1986-06-05 Helmut 7210 Rottweil Steinhilber Vorrichtung zum vereinzelten zufuehren von blaettern zur schreibwalze einer bueromaschine
JPS61130441U (fr) * 1985-01-31 1986-08-15
DE3546617C2 (en) * 1985-04-04 1990-04-26 Helmut 7210 Rottweil De Steinhilber Device for feeding individual sheets to the roller platen of a printer
US4728963A (en) * 1987-03-11 1988-03-01 Hewlett-Packard Company Single sheet ink-jet printer with passive drying system
JPS63288837A (ja) * 1987-05-18 1988-11-25 Seiko Epson Corp 給紙装置

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2123811C3 (de) * 1970-05-18 1978-12-07 Canon K.K., Tokio Papierzuführeinrichtung
US3944215A (en) * 1974-11-18 1976-03-16 Pitney-Bowes, Inc. Sheet feeding apparatus
CH611577A5 (en) * 1976-04-05 1979-06-15 Kurt Ruenzi Device on an office machine for the automatic feeding thereof with sheets
CH620652A5 (fr) * 1978-01-23 1980-12-15 Rutishauser Data Ag
CH637899A5 (en) * 1979-05-29 1983-08-31 Albert Rutishauser Transport device for sheet-like recording media
HU181219B (en) * 1980-11-21 1983-06-28 Irodagepipari Es Finomechanika Paper passing apparatus with alternating paper motion and two different paces,preferably for electric cash registers and line-printers
DE3121661A1 (de) * 1981-05-30 1982-12-16 Olympia Werke Ag, 2940 Wilhelmshaven Einzelblattzufuehrvorrichtung zur schreibwalze einer bueromaschine

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0237077A3 (en) * 1986-03-14 1990-01-10 Nec Corporation Cut sheet feeding mechanism
EP0338578A3 (en) * 1988-04-21 1990-03-28 Mitsubishi Denki Kabushiki Kaisha Paper feeder for printer
US4958950A (en) * 1988-04-21 1990-09-25 Mitsubishi Denki Kabushiki Kaisha Paper feeder for printer
CN107101859A (zh) * 2017-05-26 2017-08-29 郭晓斌 标本载附滤纸条自动递送装置

Also Published As

Publication number Publication date
JPS5957835A (ja) 1984-04-03
DD216422A5 (de) 1984-12-12
DE3232275A1 (de) 1984-03-01
DE3232275C2 (de) 1985-08-01
EP0104337A3 (fr) 1985-07-17

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