EP0025836B1 - Blattzuführvorrichtung für Schreibmaschine oder dgl. - Google Patents

Blattzuführvorrichtung für Schreibmaschine oder dgl. Download PDF

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Publication number
EP0025836B1
EP0025836B1 EP80104357A EP80104357A EP0025836B1 EP 0025836 B1 EP0025836 B1 EP 0025836B1 EP 80104357 A EP80104357 A EP 80104357A EP 80104357 A EP80104357 A EP 80104357A EP 0025836 B1 EP0025836 B1 EP 0025836B1
Authority
EP
European Patent Office
Prior art keywords
paper
sheets
platen
plate
rollers
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
Application number
EP80104357A
Other languages
English (en)
French (fr)
Other versions
EP0025836A3 (en
EP0025836A2 (de
Inventor
Robert Lee Burton
Thomas Patrick Finan
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.)
Lexmark International Inc
Original Assignee
International Business Machines Corp
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 International Business Machines Corp filed Critical International Business Machines Corp
Publication of EP0025836A2 publication Critical patent/EP0025836A2/de
Publication of EP0025836A3 publication Critical patent/EP0025836A3/fr
Application granted granted Critical
Publication of EP0025836B1 publication Critical patent/EP0025836B1/de
Expired 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
    • 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
    • B41J13/076—Construction of rollers; Bearings therefor

Definitions

  • the present invention relates to a paper feed device for a typewriter or the like.
  • the paper is first introduced between the rotary plate and the means rear feed rollers which bear against said plate to be driven by the rotation of the latter and cause the paper to be entrained on a predetermined path between said plate and said roller means.
  • the paper while advancing, follows the circumference of the plate and passes between the means with front feed rollers on the one hand, which bear against the plate so as to be driven by its rotation, and the plate on the other hand, before reaching the printing position.
  • the paper feeding path is straight, that is to say without deviation on the platen, to avoid the operator having to straighten the position of the sheets after feeding them.
  • the device for feeding the paper into a printer can ensure a movement of the sheet or sheets forwards or backwards controlled by the rotation of the platen in one direction or the other, without causing a bad horizontal alignment of the printing line.
  • an automatic correction typewriter when it is desired to correct an error after the paper has been advanced from the line where the error was made, it is necessary to drive the turntable in reverse rotation to replace the printed line to be corrected in the printing line position.
  • An automatic correction operation requires precise positioning of the line to be corrected opposite the printing line. Then, it is necessary to manually turn the platen in the opposite direction to bring the paper back to the line on which the printing operation is carried out, except in the case where printing is completed. This is also true for machines without the possibility of automatic correction in which the operator places a ribbon or correction paper on the error, then strikes the correct character.
  • the problem posed by the precise positioning of the sheet or sheets after driving the back plate is particularly acute in the case where the sheets of paper are automatically advanced in the typewriter by an electric means ensuring the advancement not at not platinum, rather than manually, then brought back by the manual rear rotation of said plate.
  • This is due to the fact that the rotation drive of the plate by an electric means causes a higher acceleration than that obtained by a manual drive and that this higher acceleration causes a greater slip than that due to a manual rotation. Therefore, to obtain a quality impression of a set of sheets of paper separated by sheets of carbon paper, it is necessary to ensure a minimum staging of the sheets, the absence of creases, minimum deviation and precise positioning. sheets when returning the deck. All this must be ensured without any marking of the sheets by the adjacent sheet of carbon paper and which could be due to the force applied by the rear feed rollers against the plate.
  • the feeding device satisfactorily solves the above-mentioned problems, by feeding a set of sheets of printing paper and carbon paper into a typewriter without causing folds of the sheets or the appearance of carbon marks on the printing sheets, with minimal staging or offset and vertical deflection of the sheets on the platen while ensuring precise positioning of the paper when reversing the platinum.
  • the paper feed device uses several rear feed rollers separated from each other, the outer surface of which is coated with a material which is sufficiently soft to allow part of the rear feed rollers to remain in contact. with the rotary plate so as to be driven by it, while the second part of said rear rollers is separated from the plate by all of the sheets of printing paper and carbon paper.
  • This covering material must have a sufficiently high coefficient of friction with respect to the material constituting the plate on the one hand, so that the rear feed rollers are entrained by said plate and with respect to the printing sheets, on the other hand , so that said rear rollers cause the paper to advance in association with the plate.
  • rear feed rollers By choosing relatively narrow and laterally stable rear feed rollers, the formation of creases is avoided, despite the relatively high coefficient of friction existing between the rear feed rollers and the plate, which means that the rollers tend to cause effectively sheets of paper.
  • the rear feed rollers being separated from each other and having good lateral stability, they ensure a practically uniform supply of the printing sheets and of carbon paper and therefore avoid any deviation of these on the platen.
  • Figure 1 is an exploded perspective view of part of a typewriter including the paper feed device according to the present invention.
  • Figure 2 is a schematic side view of the paper feeding device according to the present invention.
  • Figure 3 schematically shows the supply of several sheets of paper between a rear feed roller and a plate, the feed roller being deformed by the pressure exerted by the sheets.
  • Figure 4 is a plan view of the annular outer portion of a rear feed roller of the paper feed device according to the present invention.
  • Figure 5 is a side view of the annular outer part of Figure 4.
  • FIG. 6 is a partial section view of a part of the structure intended to support the annular external part of FIG. 4.
  • Figure 1 represent a plate 10 rotatably mounted between two side plates fixed to the frame of a typewriter, in a manner well known to those skilled in the art.
  • This assembly allows manual rotation of the plate in one direction or the other or its drive in one direction by a stepping motor as described in European patent application No. 791024573 filed by the applicant on July 16, 1979 and published on April 2, 1980.
  • the plate 10 cooperates with rear feed roller means 11 and front feed roller means 12 which ensure the advancement of several sheets of paper 14 ( Figure 3) when the plate 10 is rotated in one direction or in the other.
  • the advancement of the sheets of paper 14 which can be separated by interleaved sheets of carbon paper, at the position allowing the printing of the characters on said sheets of paper by the typewriter is started by the initial passage of the sheets 14 between the plate 10 and the rear feed roller means 11.
  • the support elements 15 are fixed to the ends of four arms of paper supply 16 by studs 17 which are hot pressed into the arms 16.
  • the opposite ends of the arms 16 are fixed to the ends of adjustment bars 18 by means of pins 19 and circlips 20 mounted on the pins 19 , and pivot relative to said adjustment bars.
  • the adjustment bars 18 are mounted and adjusted on a profile 21 fixed to the frame of the machine and used for feeding the paper and are fixed to the profile 21 by screws 22 passing through buttonholes 23 formed therein and screwed into threaded bores 24 machined in the adjustment bars 18. This arrangement makes it possible to adjust the means with rear feed rollers 11 and front feed rollers 12 in an appropriate position relative to the plate 10.
  • a cutout 26 formed in each of the supply arms 16 receives one end of a flexible blade 25 slightly curved to recall the means with rear feed rollers 11 and front feed rollers 12 upwards against the plate 10.
  • the other end of each of the flexible blades 25 is fixed to the profile 21 by screws 27.
  • a curved deflector 28 is disposed adjacent to the plate 10 and has longitudinally spaced rectangular openings 29 which allow each of the two rear feed roller means 11 to bear on the plate 10 in the absence of sheets 14 ( Figure 2) .
  • the inner edge of the deflector 28 also has longitudinal cutouts 30 in slots which allow each of the two feed roller means 12 to bear on the plate 10 in the absence of sheets 14 ( Figure 3).
  • the lower ends of the deflector 28 include a yoke 31 which overlaps a tongue 32 secured to a support 33.
  • the two supports 33 are fixed to the outside of the two outer arms 16 by the studs 17 which also ensure the fixing of the two support elements 15 to the two outer arms 16.
  • Each of the means with rear feed rollers 11 and front feed rollers 12 is spaced from the plate 10 against the restoring force exerted by the flexible blades 25, by a bent rod 34 whose opposite ends are rotatably mounted in the side plates.
  • a lever (not shown) makes it possible to move the rod 34 when it is desired to separate the feed roller means 11 and 12 from the plate 10 against which they are applied by the flexible blades 25.
  • the rear feed roller means 11 comprise an axis 35 the ends of which are mounted for rotation in holes 36 formed in the support elements 15.
  • Each axis 35 carries three roller carriers 37 longitudinally spaced and rotating with it.
  • the roller carriers 37 are made of a non-flexible material such as an acetal-based plastic.
  • the roller carriers 37 are force fitted on the axis 35 in positions such that each of them is aligned with one of the rectangular openings 29 formed in the deflector 28.
  • Each of the roller carriers 37 has a central cylindrical portion 38 and a hub 39 ( Figure 6) of larger diameter at each end.
  • a ring 40 ( Figures 1,4 and 5) is mounted on the hub 39 ( Figure 6) between two flanges 41.
  • each hub 39 with its ring 40 ( Figures 1, 4 and 5) constitutes one of the rollers of the means to rear feed rollers 11.
  • the crown 40 is made of a molded elastomeric material such as rubber or neoprene, for example.
  • the elastomeric material making up the crown 40 must be sufficiently compressible ( Figure 3) so that part of it remains in contact with the plate 10 when the sheets 14 are introduced between the plate 10 and the crowns 40 of the rollers. Thus, the drive contact will be maintained between the plate 10 and the crown 40 when sheets 14 are introduced into the machine.
  • neoprene with a hardness of 30 to 35, according to the Shore A scale can be used satisfactorily for the formation of crowns 40 when the plate 10 is formed of rubber based on styrene d '' a hardness of approximately 91, according to the Shore D scale, and that each of the flexible blades 25 (Figure 1) applies a force of 4.9 to 5.8 newtons to the means with feed rollers and to the plate 10
  • a neoprene of such hardness has a sufficiently high coefficient of friction with respect to the material composing the plate 10, which allows each crown 40 to be driven by the plate 10 to facilitate the feeding of the sheets.
  • Each of the rings 40 has a thickness equal to or less than its width. All the crowns 40 have the same width which is preferably between 3.175 and 6.35 mm. If the thickness of the crown 40 is greater than its width, the crown tends to deform laterally and to cause creases in the paper.
  • the distance separating the crowns 40 on the axis 35 ( Figure 1) is greater than the width of said crowns 40. As shown in Figure 1, the distance separating each of the crowns 40 on the same roller carrier 37, and measured on the axis 35 is less than the distance separating a ring 40 from the ring 40 closest to the neighboring roller carrier 37.
  • Each of the feed roller means having 12 comprises an axis 42, the ends of which are mounted in a hole 43 formed in the support elements 15.
  • Each axis 42 carries several cylindrical rollers 44 made of relatively hard material such as branded polyethylene chlorosulfonate Hypalon manufactured by du Pont and having a hardness of 50 (Shore A scale), which are force fitted or retained by circlips and separated longitudinally from each other.
  • Each roller 44 has practically the same width on the axis 42 as the corresponding roller holder 37 on the axis 35.
  • the contact area provided by each of the rollers 44 of the front feed roller means 12 is wider than that provided by the rings 40 of each of the rollers of the rear feed roller means 11.
  • roller carriers 37 have been described here (FIG. 1) equipped with two crowns 40, those skilled in the art will understand that the hubs 39 could be surrounded by the crowns 40, but without being connected in pairs by the central cylindrical parts 38 of reduced diameter and that they could then in the same way be force-fitted on the axis 35. This solution is more expensive because of the number of additional parts to be produced, but the same results would be obtained.
  • crowns 40 The choice of an elastomeric material>, with a hardness of 30 to 35 (Shore A scale) for the formation of crowns 40, is indicated only by way of example.
  • the hardness of this material could therefore be chosen as a function of the plate 10 and of the force applied by the flexible blades 25 to the plate 10 and to the rear feed roller means 11.
  • the material making up the crowns 40 must also be chosen so that its coefficient of friction with respect to the plate 10 is high enough to ensure a drive without sliding of the crowns 40 by the plate 10 when the latter is rotated.
  • the hardness of the material forming the crowns 40 should be between 30 and 35 (Shore A scale), due to the fact that it is relatively expensive to manufacture materials having a hardness less than 30 and that crowns 40 made of a material with a hardness exceeding 35, could not be sufficiently compressed by the plate 10.
  • the force applied by the flexible blades 25 cannot be increased significantly without causing the appearance of carbon marks on the print sheets.
  • the device of the present invention therefore allows a relatively large quantity of sheets of paper to be entrained between a plate and rear feed roller means without wrinkles and with a minimum vertical offset of said sheets, avoids having to correct by hand the position of the sheets relative to each other after a set of sheets has been brought into the printing position, ensures precise feeding of the sheets in either direction, either manually, either through a motor, and positively drives the leaves without requiring the application by the rear feed roller means, of a force large enough to cause the appearance of carbon marks on the leaves impression.

Landscapes

  • Delivering By Means Of Belts And Rollers (AREA)
  • Handling Of Cut Paper (AREA)
  • Advancing Webs (AREA)
  • Sheets, Magazines, And Separation Thereof (AREA)

Claims (5)

1. Blattzuführ-Vorrichtung für Schreibmaschinen od. dgl., bestehend aus einer Schreibwalze (10), hinteren Mitnahmerollen (11) und vorderen Mitnahmerollen (12), die gegen die Schreibwalze anliegen, wenn kein Papier zwischen ihnen und der Schreibwalze liegt, so daß sie von der letzteren gedreht werden, wenn diese ihrerseits gedreht wird, dadurch gekennzeichnet, daß jede der hinteren Mitnahmerollen (11) mindestens an ihrem Umfang mit einem derart elastischen Werkstoff versehen ist, daß, wenn mehrere Papierblätter gleichzeitig zwischen ihnen und der Schreibwalze liegen, der nicht durch die Papierblätter von der Schreibwalze getrennte Teil jeder Rolle immer noch an die Schreibwalze angedrückt wird, so daß die Rolle durch die Drehung der Schreibwalze in Bewegung gehalten wird, wobei der genannte Werkstoff einen solchen Reibungskoeffizienten mit der Schreibwalze sowie mit dem Papier aufweist, daß jede der genannten hinteren Mitnahmerollen durch die Schreibwalze angetrieben wird und die genannten Blätter zusammen mit der Schreibwalze antreibt.
2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß jede der hinteren Mitnahmerollen einen ringförmigen Umfangsteil (40) aus dem genannten elastischen Werkstoff aufweist und dieser auf einer Halterung montiert und höchstens ebenso dick wie breit ist.
3. Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, daß die genannten Halterungen in Abständen voneinander auf einer Achse (35) geführt sind, die ihrerseits drehbar in der Maschine gelagert ist, wobei jede der Halterungen ein mit der Achse rotierendes Element (38) enthält, mit zwei in einem gewissen Abstand voneinander angeordneten Naben (39), deren jede einen der genannten ringförmigen Umfangsteile (40) und an jeder Seite des genannten Umfangsteils einen Flansch (41) enthält, wobei die Naben aus nichtelastischem Werkstoff gefertigt sind.
4. Vorrichtung nach Anspruch 3, dadurch gekennzeichnet, daß der Abstand zwischen den beiden auf der gleichen Halterung angeordneten ringförmigen, voneinander getrennten Umfangsteilen (40) in Achsrichtung größer ist als die Breite der genannten ringförmigen Umfangsteile.
5. Vorrichtung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß der Werkstoff, aus dem die genannten ringförmigen Umfangsteile gefertigt sind, ein Elastomer mit einer Härte von 30 bis 35 Grad der Härteskala Shore A ist.
EP80104357A 1979-09-21 1980-07-24 Blattzuführvorrichtung für Schreibmaschine oder dgl. Expired EP0025836B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US06/077,884 US4297045A (en) 1979-09-21 1979-09-21 Paper feed system for a typewriter or the like
US77884 1987-07-27

Publications (3)

Publication Number Publication Date
EP0025836A2 EP0025836A2 (de) 1981-04-01
EP0025836A3 EP0025836A3 (en) 1981-04-22
EP0025836B1 true EP0025836B1 (de) 1983-06-15

Family

ID=22140610

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80104357A Expired EP0025836B1 (de) 1979-09-21 1980-07-24 Blattzuführvorrichtung für Schreibmaschine oder dgl.

Country Status (5)

Country Link
US (1) US4297045A (de)
EP (1) EP0025836B1 (de)
JP (1) JPS5812157B2 (de)
CA (1) CA1135209A (de)
DE (1) DE3063772D1 (de)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58205783A (ja) * 1982-05-26 1983-11-30 Kyushu Matsushita Denki Kk 印字機械における記録用紙の送り装置
US4502804A (en) * 1982-09-24 1985-03-05 Willcox Frederick P Paper feeding and guiding system
GB8315732D0 (en) * 1983-06-08 1983-07-13 Xerox Corp Sheet curl control apparatus
JPS60147368A (ja) * 1984-01-13 1985-08-03 Ricoh Co Ltd 印字装置の用紙送り機構
JPH0516114Y2 (de) * 1987-11-13 1993-04-27
US5209468A (en) * 1992-02-14 1993-05-11 Bell & Howell Phillipsburg Company Articulated document feeder
JPH0632023A (ja) * 1992-07-20 1994-02-08 Tokyo Electric Co Ltd インクジェットプリンタ
US6170820B1 (en) * 1997-09-12 2001-01-09 Unisys Corporation Roller biasing for sheet engagement
US6390700B1 (en) 2000-07-11 2002-05-21 Lexmark International, Inc Absolute location low wear bearing for an imaging apparatus
US20030109201A1 (en) * 2001-12-07 2003-06-12 Ossio Veronica Sara Procedure for manufacturing artistic and utilitarian objects from stone
US6741342B2 (en) 2002-04-10 2004-05-25 Hewlett-Packard Development Company, L.P. Using a laser beam to indicate roller wear
US6677749B2 (en) 2002-04-10 2004-01-13 Hewlett-Packard Development Company, L.P. Using variable inductance to indicate roller wear
US6622880B1 (en) * 2003-01-06 2003-09-23 Crest Foam Industries Foam insert for pressure vessels
US8177332B2 (en) * 2009-01-13 2012-05-15 Xerox Corporation Method and apparatus for fixing a radiation-curable gel-ink image onto a substrate
JP6314492B2 (ja) * 2014-01-20 2018-04-25 株式会社デンソーウェーブ デジタルフィルタ回路

Family Cites Families (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1242343A (en) * 1917-03-17 1917-10-09 Henry C Gillespie Paper-feeding device.
US2052566A (en) * 1933-11-21 1936-09-01 Haines Office Machine Supply C Feed roll for typewriters and the like
DE677518C (de) * 1934-11-16 1939-06-27 Erwin O Haberfeld Vorrichtung zum Foerdern von Papierbogen in Schreib-, Rechen-, Buchungsmaschinen u. dgl.
US2233955A (en) * 1939-05-02 1941-03-04 Underwood Elliott Fisher Co Typewriter feed roll and the like
US2328624A (en) * 1940-12-28 1943-09-07 Ibm Typewriting machine
US2356842A (en) * 1941-12-13 1944-08-29 Underwood Elliott Fisher Co Typewriting machine
US2767821A (en) * 1954-03-29 1956-10-23 Royal Mcbee Corp Sheet feeding mechanism for typewriters or like machines
US3042179A (en) * 1959-10-19 1962-07-03 Mouroe Calculating Machine Com Sheet fefding mechanism
US3635466A (en) * 1970-05-20 1972-01-18 Burroughs Corp Elastic mounting assembly
DE2104166B1 (de) * 1971-01-29 1972-08-24 Mathias Baeurle Gmbh
CA963418A (en) * 1971-03-25 1975-02-25 Kazuhiko Nakata Record card feed device
US3749221A (en) * 1972-02-24 1973-07-31 Addmaster Corp Paper feed mechanism for data printers
US3929327A (en) * 1974-04-01 1975-12-30 Addressograph Multigraph Document transport and registration apparatus
FR2290310A1 (fr) * 1974-10-23 1976-06-04 Philips Nv Dispositif d'impression avec rouleau d'espacement
SE390707B (sv) * 1974-11-06 1977-01-17 Philips Svenska Ab Tryckanordning
JPS5275489U (de) * 1975-12-04 1977-06-06
JPS5448709U (de) * 1977-09-07 1979-04-04

Also Published As

Publication number Publication date
US4297045A (en) 1981-10-27
EP0025836A3 (en) 1981-04-22
DE3063772D1 (en) 1983-07-21
CA1135209A (en) 1982-11-09
EP0025836A2 (de) 1981-04-01
JPS5646781A (en) 1981-04-28
JPS5812157B2 (ja) 1983-03-07

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