EP0450740A1 - Verfahren und Vorrichtung zum Positionieren des Anfangs einer Endlosbahn im Schubtraktorbetrieb in einem Drucker - Google Patents

Verfahren und Vorrichtung zum Positionieren des Anfangs einer Endlosbahn im Schubtraktorbetrieb in einem Drucker Download PDF

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Publication number
EP0450740A1
EP0450740A1 EP91250079A EP91250079A EP0450740A1 EP 0450740 A1 EP0450740 A1 EP 0450740A1 EP 91250079 A EP91250079 A EP 91250079A EP 91250079 A EP91250079 A EP 91250079A EP 0450740 A1 EP0450740 A1 EP 0450740A1
Authority
EP
European Patent Office
Prior art keywords
endless
push tractor
tractor
gear train
friction 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.)
Withdrawn
Application number
EP91250079A
Other languages
German (de)
English (en)
French (fr)
Inventor
Wolfgang Dipl.-Ing. Hauslaib
Günter Dipl.-Ing. Gomoll
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.)
Vodafone GmbH
Original Assignee
Mannesmann 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 Mannesmann AG filed Critical Mannesmann AG
Publication of EP0450740A1 publication Critical patent/EP0450740A1/de
Withdrawn legal-status Critical Current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
    • 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
    • B41J11/36—Blanking or long feeds; Feeding to a particular line, e.g. by rotation of platen or feed roller

Definitions

  • the invention relates to a method and a device for positioning the beginning of an endless web in push tractor operation in a printer, in which a deflecting channel is then present on the paper channel of the push tractor in the feed direction, with a subsequent pair of friction rollers and with a downstream pressure abutment, the tractor drive shaft and the pair of friction rollers are connected in terms of transmission technology to a common drive motor via gear trains of different lengths.
  • the system of push tractors which usually consist of two side tractors and thus each form a pair of push tractors, requires an endless web of paper to be guided through a relatively narrow arcuate channel, because either a vertical position on a beam-shaped pressure abutment or an arched support a cylindrical pressure abutment must be achieved.
  • a pair of friction rollers is assigned to the push tractor in the feed direction upstream of the pressure abutment in order to tighten up undulating endless tracks.
  • the ripple of the paper is particularly to be feared because such continuous webs can have one or more layers, so that the gap width of the narrow arcuate channel must be matched to the required channel height.
  • the object of the invention is to eliminate the initial error of uneven paper transport.
  • the object is achieved according to the invention by a method in that the beginning of the endless web is advanced to the printing position for printing a first line, that after that The direction of feed is reversed and the beginning of the endless web is moved back so far that it still remains between the pair of friction rollers and that the endless web is then moved into the final printing position for the first printing line by reversing the direction of movement again.
  • This method eliminates the initial error mentioned, in which the first print line is not printed precisely enough at the predetermined position.
  • the errors mentioned on the first three to four pages are advantageously eliminated, so that there is no paper loss and, at the same time, the pages in question do not have to be printed repeatedly.
  • the friction roller pair and the push tractor can be driven via a common drive motor by means of separate gear trains are, it is further proposed that the gap width of the deflection channel is designed for multi-layer endless tracks and that the first gear train for the push tractor is longer than the second gear train for the friction roller pair, the first gear train for the push tractor starting from the common drive motor to a drivable push tractor shaft is attached, on each of which a tractor wheel is assigned a drive wheel, over which an endless drive belt is guided, the pins of which engage in perforations in the edge of the endless web.
  • the endless drive belt and the associated empty play lead to an empty play which increases the total empty play of the first gear train.
  • the gap width and the length of the gear trains are directly related. Since a longer gear train has a greater idle clearance, the Movement of the push tractor, which is connected to the drive motor via the longer, first gear train, later on, so that first of all the same is driven earlier for the friction roller pair via the shorter empty play path of the second gear train, so that the paper is tightened before the Push tractor begins its work of advancing the endless track.
  • Such desired empty play can therefore be additionally generated by the first gear train for the push tractor being formed from the drive motor by means of a plurality of intermeshing gear wheels.
  • a push tractor 1 with a paper channel 2 in the feed direction 3 has a deflecting channel 4 adjoining the paper channel 2 with a subsequent pair of friction rollers 5 and a pressure abutment 6, in front of which a print head 7 is moved back and forth perpendicular to the drawing plane.
  • the push tractor 1 consists of two side tractors arranged in parallel, which, however, have the same design are like the simply drawn push tractor 1, sit on a common push tractor shaft 8 and are adjusted to the width of the endless web 9 of the paper.
  • the endless web 9 can be introduced from below or obliquely from above.
  • a plurality of smaller pressure rollers 5b lying on an axis 10 are provided.
  • the terms “the push tractor 1” and “the pair of friction rollers 5” are abbreviated, which means the above elements.
  • the push tractor shaft 8 is started from a drive motor 11 via a first gear train 12, consisting of the smaller motor gear 14, a larger gear 15, a gear 16 coaxial with this and a gear 17 driven by it (all of which are from Injection molded plastics) driven, wherein the gear 17 is fixed on the push tractor shaft 8.
  • a second, shorter gear train 18 for the friction roller pair 5 results from the motor gear 14, a gear 13 and a coaxial gear 19, a gear 20, a coaxial gear 21 and a gear 22 that is largely the same in diameter as the friction roller 5a.
  • first gear train 12 Because of the play of intermeshing gear wheels and the empty play in the push tractor 1, the unequally longer first gear train 12 has a greater empty play than the shorter, second gear train 18.
  • the method for positioning a beginning 23 of the endless web 9 in a first printing position 24 is now carried out in such a way that the beginning 23 of the endless web 9 in the printing position 24 for printing one
  • the first line is moved forward, that the feed direction is then reversed and the beginning 23 of the endless web 9 is moved back so far that it still remains between the friction roller pair 5 and that the endless web 9 is then reversed in the direction of movement into the final printing position 24 for the first printing line is brought up.
  • the endless track 9 bears against an outer radius 29 of the deflecting channel 4 and thereby loses its path. At point 30 the transfer into the friction roller pair 5 takes place.
  • the beginning 23 of the endless track 9 is in the "position 1", this first step leading to a feed error of approximately 1.5 to 2 mm can lead according to the circumstances.
  • the beginning 23 of the endless track 9 cannot deflect at point 31 (because the paper already lies against the outer radius 29 of the channel 4) and therefore stops until the push tractor 1 is driven (slip between the pair of friction rollers 5 and the endless track 9).
  • the endless web 9 is therefore pulled back again behind the horizontal line 28 (sensor position).
  • the three process steps described above depend on a gap width 35 of the deflection channel 4, i.e. on the number of sheets of the endless web 9 forming a form.
  • a multilayer endless track 9 determines the gap width 35 and then a larger empty play of the first longer gear train 12 for the push tractor 1 and a smaller empty play of the second shorter gear train 18 for the friction roller pair 5.
  • This empty play between the individual drive elements can be influenced by the fact that the first gear train 12 for the push tractor 1, starting from the common drive motor 11, is connected to a drivable push tractor shaft 8, on each of which a drive wheel 36 is arranged, which is assigned to a tractor side endless drive belt 37 is guided, which engages by means of its pins 37a in peripheral perforations of the endless web 9.
  • a further influencing of the empty play takes place in that the first gear train 12 for the push tractor 1 is formed by the drive motor 11 by means of a plurality of intermeshing gear wheels 14, 15, 16 and 17.
  • This principle of empty play determination is also used in that the second gear train 18 for the friction roller pair 5 is formed by the drive motor 11 by means of a plurality of intermeshing gear wheels 13, 14, 19, 20, 21 and 22.

Landscapes

  • Handling Of Sheets (AREA)
EP91250079A 1990-04-06 1991-03-18 Verfahren und Vorrichtung zum Positionieren des Anfangs einer Endlosbahn im Schubtraktorbetrieb in einem Drucker Withdrawn EP0450740A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4011685 1990-04-06
DE19904011685 DE4011685A1 (de) 1990-04-06 1990-04-06 Verfahren und vorrichtung zum positionieren des anfangs einer endlosbahn im schubtraktorbetrieb in einem drucker

Publications (1)

Publication Number Publication Date
EP0450740A1 true EP0450740A1 (de) 1991-10-09

Family

ID=6404193

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91250079A Withdrawn EP0450740A1 (de) 1990-04-06 1991-03-18 Verfahren und Vorrichtung zum Positionieren des Anfangs einer Endlosbahn im Schubtraktorbetrieb in einem Drucker

Country Status (3)

Country Link
EP (1) EP0450740A1 (enrdf_load_stackoverflow)
JP (1) JPH04226376A (enrdf_load_stackoverflow)
DE (1) DE4011685A1 (enrdf_load_stackoverflow)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4521983B2 (ja) * 2000-11-15 2010-08-11 株式会社サトー ラベルプリンタ自動用紙セット方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2634249B2 (enrdf_load_stackoverflow) * 1975-07-31 1980-04-30 Ncr Corp., Dayton, Ohio (V.St.A.)
DE3135093A1 (de) * 1980-11-21 1982-07-08 Irodagépipari és Finommechanikai Vállalat, Budapest Papierstreifenfoerderer eines zeilendruckers
WO1983003076A1 (en) * 1982-03-08 1983-09-15 Andersson, Leif, Helmer Paper alignment device for a printer, typewriter or like office machine
EP0189798A1 (de) * 1985-01-28 1986-08-06 Siemens Aktiengesellschaft Verfahren zur Steuerung des Papiervorschubs in einer Druckeinrichtung
EP0280643A2 (de) * 1987-02-24 1988-08-31 MANNESMANN Aktiengesellschaft Vorrichtung für den Papiertransport in einer Büromaschine, insbesondere in einem Matrixdrucker

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2567236B2 (ja) * 1987-03-02 1996-12-25 セイコープレシジョン株式会社 記録紙正逆送り装置
JPS6440360A (en) * 1987-08-06 1989-02-10 Alps Electric Co Ltd Paper feed method in printer
TW275070B (enrdf_load_stackoverflow) * 1992-12-22 1996-05-01 Ciba Geigy Ag

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2634249B2 (enrdf_load_stackoverflow) * 1975-07-31 1980-04-30 Ncr Corp., Dayton, Ohio (V.St.A.)
DE3135093A1 (de) * 1980-11-21 1982-07-08 Irodagépipari és Finommechanikai Vállalat, Budapest Papierstreifenfoerderer eines zeilendruckers
WO1983003076A1 (en) * 1982-03-08 1983-09-15 Andersson, Leif, Helmer Paper alignment device for a printer, typewriter or like office machine
EP0189798A1 (de) * 1985-01-28 1986-08-06 Siemens Aktiengesellschaft Verfahren zur Steuerung des Papiervorschubs in einer Druckeinrichtung
EP0280643A2 (de) * 1987-02-24 1988-08-31 MANNESMANN Aktiengesellschaft Vorrichtung für den Papiertransport in einer Büromaschine, insbesondere in einem Matrixdrucker

Also Published As

Publication number Publication date
JPH04226376A (ja) 1992-08-17
DE4011685C2 (enrdf_load_stackoverflow) 1992-05-07
DE4011685A1 (de) 1991-10-17

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