EP0403481B1 - Papierführungseinrichtung für druckeinrichtungen - Google Patents

Papierführungseinrichtung für druckeinrichtungen Download PDF

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Publication number
EP0403481B1
EP0403481B1 EP89900192A EP89900192A EP0403481B1 EP 0403481 B1 EP0403481 B1 EP 0403481B1 EP 89900192 A EP89900192 A EP 89900192A EP 89900192 A EP89900192 A EP 89900192A EP 0403481 B1 EP0403481 B1 EP 0403481B1
Authority
EP
European Patent Office
Prior art keywords
paper
guiding device
carrier part
carrier
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.)
Expired - Lifetime
Application number
EP89900192A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0403481A1 (de
Inventor
Richard Thurner
Hans Kusmierz
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Publication of EP0403481A1 publication Critical patent/EP0403481A1/de
Application granted granted Critical
Publication of EP0403481B1 publication Critical patent/EP0403481B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B41J13/02—Rollers
    • B41J13/036—Rollers co-operating with a roller platen
    • B41J13/048—Front and rear rollers both mounted on a common carrier
    • B41J13/054—Front and rear rollers both mounted on a common carrier on the paper apron concentric with the roller platen

Definitions

  • the invention relates to a paper guide device for printing devices according to the preamble of the main claim.
  • Paper guide devices of this type are generally known and are successfully used for the most varied types of construction of the printing devices on the market.
  • the most important components of such paper guide devices are a paper support designed as a paper roller, generally a paper guide trough, which is combined with paper guide rollers and is arranged below the platen roller in such a way that the writing sheet drawn through from behind under the platen roller can be guided forward into the writing line area.
  • a paper feed device for printing devices with a paper support designed as a paper roll and a paper guide trough resiliently resting on the paper roll with paper pressure elements is known.
  • the paper guide trough consists of a rigid roller carrier with four paper pressure rollers arranged on it. Centrally acting lever arrangements are attached to these paper pressure rollers.
  • Such a gimbal suspension of the roll carrier means that the paper pressure rolls lie evenly on the paper roll or the record carrier guided between them.
  • the Paper detector comprises a reflection light sensor with a light emitting element which emits light to one of the two paper guides and with a light receiving element which receives light reflected from paper located in this paper guide.
  • a detector lever is provided which is moved when paper is inserted into the other paper guide. The detector lever then in turn moves a reflection plate into a position in which it covers the front of the light sensor and reflects the light from the light emitting element to the light receiving element.
  • the light sensor facing the paper guide is able to determine whether or not paper is inserted into this paper guide.
  • the reflection plate When the paper is inserted into the other paper guide, the reflection plate is pushed in front of the light sensor due to the movement of the detector lever, so that the light coming from the light sensor is reflected by this reflection plate. In this way, it can be determined via the reception of the light reflected in this way whether or not there is paper in the other paper guide.
  • US-A-2218108 discloses a paper feed mechanism for a typewriter which has a paper guide element in the form of a metallic plate which is adapted to the contour of the platen roller.
  • the guide element together with the platen roller, delimits a guide channel for the recording medium and has openings in which paper feed rollers extend in part and press the recording paper against the platen roller.
  • the object of the invention is therefore to provide a device for the transport and positioning of record carriers of all kinds, which ensures a precise location assignment to the printhead and to the paper auxiliary devices, as well as ensuring a positionally accurate retraction of the record carriers and an exact exit angle of the record carriers, with production-favorable manufacture.
  • the selected setting force for the paper pressure rollers can be indicated by the location of lugs on adjusting levers on corresponding notches in the paper tub.
  • a arranged on the front wall of the paper tray metallic paper pressure apron which the recording medium in front of the printing point of the Printhead presses and smoothes, is designed as a closed surface, whereby contamination of the paper pressure roller by ink drops is prevented and dusting of the ink head due to paper abrasion is minimized.
  • Another advantage is that a mass connection is made by integrally formed spring tongues on the foot part of the paper pressure apron, which are supported on a part of the printer chassis when the paper guiding device of the printing device is mounted, thus preventing a static charge on the recording medium.
  • a strip of absorbent material is provided between the paper pressure apron and the fastening strip, which absorbs lost ink drops and can be easily replaced as a wearing part if required.
  • a monitoring device consisting of an optoelectronic and a mechanical scanner centered and screwed in position on a side wall of the paper tray, that is to say firmly assigned to the paper guide device, makes a separate adjustment and adjustment of these scanner unnecessary.
  • the shape of the paper tray is in the front Area matched to the paper pressure apron.
  • a paper tray 117 which is arranged in one piece as a carrier part and is arranged over the entire width of a printing device not shown here, has a curved contour 100 on its upper side.
  • This contour 100 is adapted to the inlet of a recording medium 14 to be printed with the aid of a print head 16, the diameter of a transport roller 15 and an outlet of the recording medium 14 required for the printing principle provided in each case.
  • the underside of the paper tub 117 is provided with a plurality of transverse webs 116 connecting the front and rear walls. Lugs 120 are molded onto two transverse webs 116 arranged in the area near the edge, into which profile holes 121 are inserted for fastening the paper warning 117.
  • the transverse webs 116 form individual chambers, which are not shown in more detail in FIGS. 1 to 3, wherein in two chambers, spaced apart from one another at a certain distance, torque-free and oscillating roller carriers 2 are provided.
  • the roller carriers 2 serve to hold paper pressure rollers 5 which, together with the transport roller 15 serving as a friction drive for the recording medium 14, ensure slip-free paper transport.
  • the roller supports 2 contain two support arms 203 which are formed symmetrically with respect to the center of the guide pins 201, the free ends of which are each provided with two rotatably mounted paper pressure rollers 5 which are arranged close to one another.
  • the surface of the paper tray 117 is interrupted at these points according to the geometry of the paper pressure rollers 5 by means of rectangular openings 114 in the contour 100 of the paper tray 117 and rectangular recesses 119 at the edge of the paper tray 117, so that the paper pressure rollers 5 partially out of the contour 100 of the paper tray 117 protrude and can be pressed against the transport roller 15.
  • the guide pin 201 is guided at its end facing the transport roller 15 in a recess 118 on the paper trough 117 and, on the other hand, the other end of the guide pin 201 has a guide slot 202 running at right angles to the direction of the writing line for mounting a round bending rod 3, which the pressing force for creates a trouble-free paper transport on the paper pressure rollers 5.
  • a cutout 101 serving as a support on the front wall of the paper tray 117 and on a diamond-shaped adjusting lever 4 arranged on the rear wall of the paper tray 117.
  • the bending rod 3 projects through a guide slot 102 on the rear wall of the paper trough 117 and lies in a sawtooth-shaped link 400 in the middle of the actuating lever 4. Since this backdrop 400 and the guide slot 102 for the bending rod 3 are covered in the assembled state of the actuating lever 4 in FIGS. 2 and 3, FIG. 4 shows the actuating lever 4 in the unmounted state.
  • the backdrop 400 of the actuating lever 4 serves to adjust the pressing force of the paper pressure rollers 5.
  • a cutting edge bearing 106 and a holding and guide bracket 105 are provided on the back of the paper tub 117, which surrounds the control lever 4 in a U-shaped manner in the area of its link.
  • the length of the adjusting lever 4 is dimensioned such that when one end of the adjusting lever 4 is supported in the cutting edge bearing 106, the other end protrudes somewhat above the upper edge of the rear wall.
  • the holding and guide bracket 105 has in its middle part an upwardly open, funnel-shaped groove 104, into which the adjusting lever 4 can be brought into an assembly position without any problems and from a stud 401 arranged below the link 400 to the assembly of the bending rod 3 determines the latching position and presses the actuating lever 4 into the cutting edge bearing 106, is prevented from falling out.
  • holes 115 are provided on the adjusting levers 4 on the halves facing the notches 103, on which, if necessary, one and the two drawn in broken lines in FIG. 3 and the two Adjusting lever 4 connecting rod 6 can be articulated. In this embodiment it is ensured that the two control levers 4 can only be pivoted in the same direction, whereby a different force setting is avoided.
  • a resilient paper pressure apron 7 made of metallic material is provided on the front wall of the paper tub 117 and extends over the entire width of the platen roller 15.
  • the contour 100 of the paper trough 117 is matched to the paper pressure apron 7 by a tapering edge in the front area in such a way that kinking of the recording medium 14, in particular when using folding papers, and a line spacing error associated therewith is avoided.
  • the paper pressure apron 7 lies tangentially against the platen roller 15, as a result of which the recording medium 14 is pressed on and thereby smoothed.
  • the pressure apron 7 is designed as a closed surface in order to prevent contamination of the paper pressure rollers 5 by ink drops when using an ink print head as print head 16 and to minimize dusting of the ink print head by paper abrasion.
  • two spring tongues 700 are formed on their regions near the edge, which are supported on a part of the printer chassis 18 in the printing device 1 when the paper guide device 1 is mounted, and thereby establish a ground connection between the paper pressure apron 7 and the printer chassis 18.
  • a foam strip 9 is applied over its entire width, which picks up the possibly lost ink drops from an ink print head.
  • the paper pressure apron 7 and the foam strip 9 are attached to the front wall with the aid of a fastening strip 8 the paper tray 117 pressed and locked.
  • molded-on centering pins 107 are provided on the paper tub 117, by means of which both the paper pressure apron 7 and the foam strip 9 and the fastening strip 8 are fixed. With the aid of three screw points distributed symmetrically over the width of the fastening strip 8, the fastening strip 8 is fastened to the paper tray 117 by means of screws 19.
  • the fastening strip 8 is interrupted like a comb.
  • this ensures an accurate exit angle of the recording medium 14 that is necessary in the case of ink printing.
  • the screwed fastening strip 8 prevents the bending rod 3 from sliding out of the cutout 101 serving as a support on the front wall of the paper tub 117.
  • An optoelectronic scanner in the form of a light barrier 17 and a mechanical scanner consisting of a microswitch 11 and a switching wire 12 associated with this microswitch 11 are used to monitor and position the recording medium 14 on the left housing wall of the paper tray 117.
  • the light barrier 17, which is used, for example, as Fork light barrier with a luminescent diode as a transmitter and a phototransistor as a receiver can be built on a module 10 and, like the microswitch 11, is precisely centered on mounting pins 113 on the paper tray 117 and releasably attached to the housing wall with a screw 13.
  • German patent application P 3731538.2 published on December 22, 2008.
  • support ribs 108 projecting to the rear are formed, which serve as support points for the paper tub 117 when the paper guide device 1 is preassembled, for example while the fastening strip 8 is screwed on.
  • a plurality of latching and centering elements projecting downwards are provided on the underside of the paper tub 117. Specifically, these are each a cuboid support pin 109 arranged approximately halfway across the width of the paper tray 117 on its front and rear walls, and a snap nose 111 and 112 molded onto the side parts of the paper tray 1.
  • a wedge-shaped centering nose 110 is provided on the side to which the assembly 10 is screwed.
  • the freely projecting ends of these locking and centering elements 109, 110, 111, 112 are matched to one another in terms of their length, so that an assembly plane is thereby formed and the paper guide device 1 can be placed flat on a base, preassembled and stored.
  • the completely preassembled paper guide device 1 is plugged onto the printer chassis 18 by means of the centering lug 110 and the snap lugs 111 and 112 and is precisely assigned to the printing device and existing paper additives such as form additive, single sheet additive or feeder and locked in place as an assembly aid. Then it is screwed to the printer stand to ensure dimensional stability.

Landscapes

  • Registering, Tensioning, Guiding Webs, And Rollers Therefor (AREA)
  • Handling Of Continuous Sheets Of Paper (AREA)
  • Feeding Of Articles By Means Other Than Belts Or Rollers (AREA)
  • Delivering By Means Of Belts And Rollers (AREA)
EP89900192A 1988-01-28 1988-12-16 Papierführungseinrichtung für druckeinrichtungen Expired - Lifetime EP0403481B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3802532 1988-01-28
DE3802532A DE3802532A1 (de) 1988-01-28 1988-01-28 Papierfuehrungseinrichtung fuer druckeinrichtungen

Publications (2)

Publication Number Publication Date
EP0403481A1 EP0403481A1 (de) 1990-12-27
EP0403481B1 true EP0403481B1 (de) 1991-09-04

Family

ID=6346177

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89900192A Expired - Lifetime EP0403481B1 (de) 1988-01-28 1988-12-16 Papierführungseinrichtung für druckeinrichtungen

Country Status (4)

Country Link
US (1) US5042953A (enrdf_load_stackoverflow)
EP (1) EP0403481B1 (enrdf_load_stackoverflow)
DE (2) DE3802532A1 (enrdf_load_stackoverflow)
WO (1) WO1989007050A1 (enrdf_load_stackoverflow)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3916982A1 (de) * 1989-05-24 1990-02-08 Siemens Ag Steuerbare kupplung zur mechanischen antriebsentkopplung von motorisch parallel angetriebenen wellen
CA2014652A1 (en) * 1989-09-29 1991-03-29 Anthony W. Ebersole Printer medium drive clearance eliminator
JP2800687B2 (ja) * 1994-07-11 1998-09-21 富士通株式会社 用紙搬送装置
US6612562B2 (en) 2001-12-21 2003-09-02 Pitney Dowes Inc. Method and system for feeding media to a printer

Family Cites Families (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1655425A (en) * 1924-03-29 1928-01-10 Underwood Typewriter Co Typewriting machine
US1627123A (en) * 1925-05-02 1927-05-03 Underwood Typewriter Co Typewriting machine
US2218108A (en) * 1939-01-16 1940-10-15 L C Smith & Corona Typewriters Paper feed mechanism
US4215945A (en) * 1978-12-26 1980-08-05 International Business Machines Corporation Paper feeding apparatus
DE2946033C2 (de) * 1979-11-14 1982-08-19 Siemens AG, 1000 Berlin und 8000 München Papiereinzugsvorrichtung für Druckeinrichtungen
DE8006325U1 (de) * 1980-03-07 1981-04-09 Siemens AG, 1000 Berlin und 8000 München Papiereinzugsvorrichtung fuer fernschreibmaschinen
AT381388B (de) * 1981-06-12 1986-10-10 Philips Nv Schreibwerk mit einer fuehrungseinrichtung fuer einen aufzeichnungstraeger
US4364683A (en) * 1981-12-23 1982-12-21 International Business Machines Corporation Paper feed roller assembly for a typewriter or printer
DE3202216A1 (de) * 1982-01-25 1983-07-28 Olympia Werke Ag, 2940 Wilhelmshaven Schreib- oder aehnliche bueromaschine mit einer aufnahmevorrichtung fuer einen kartenhalter
DE3214549C2 (de) * 1982-04-20 1985-01-17 Siemens AG, 1000 Berlin und 8000 München Transportvorrichtung für randgelochtes Faltpapier und für Rollenpapier
US4491854A (en) * 1982-07-29 1985-01-01 U.S. Philips Corporation Printer with a guide ruler for flattening a record carrier
JPS6032684A (ja) * 1983-08-01 1985-02-19 Matsushita Electric Ind Co Ltd 給紙装置
JPS60116487A (ja) * 1983-11-30 1985-06-22 Nec Home Electronics Ltd プリンタの紙送り装置
US4592670A (en) * 1984-06-29 1986-06-03 International Business Machines Corporation Angular motion paper feed release system
JPS61132361A (ja) * 1984-11-30 1986-06-19 Tokyo Juki Ind Co Ltd 印字装置における印字用紙送り機構
JPS6282065A (ja) * 1985-10-07 1987-04-15 Seikosha Co Ltd プリンタの紙検出装置
US4773782A (en) * 1985-10-28 1988-09-27 Canon Kabushiki Kaisha Apparatus for transferring sheet material

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Patent Abstracts of Japan, volume 9, N0 272, M425, abstract of JP 60-116487, publ 1985-06-22 (NEC HOME ELECTRONIKS K.K.) *

Also Published As

Publication number Publication date
DE3802532A1 (de) 1989-08-10
DE3864690D1 (de) 1991-10-10
US5042953A (en) 1991-08-27
DE3802532C2 (enrdf_load_stackoverflow) 1990-04-19
WO1989007050A1 (en) 1989-08-10
EP0403481A1 (de) 1990-12-27

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