EP0037217B1 - Druckwerk - Google Patents

Druckwerk Download PDF

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Publication number
EP0037217B1
EP0037217B1 EP81301179A EP81301179A EP0037217B1 EP 0037217 B1 EP0037217 B1 EP 0037217B1 EP 81301179 A EP81301179 A EP 81301179A EP 81301179 A EP81301179 A EP 81301179A EP 0037217 B1 EP0037217 B1 EP 0037217B1
Authority
EP
European Patent Office
Prior art keywords
paper
printing head
paper feed
lever
printer
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
EP81301179A
Other languages
English (en)
French (fr)
Other versions
EP0037217A1 (de
Inventor
Noriaki Okano
Keisuke Murakami
Susumu Matsuda
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.)
Toshiba TEC Corp
Original Assignee
Tokyo Electric Co Ltd
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 Tokyo Electric Co Ltd filed Critical Tokyo Electric Co Ltd
Publication of EP0037217A1 publication Critical patent/EP0037217A1/de
Application granted granted Critical
Publication of EP0037217B1 publication Critical patent/EP0037217B1/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
    • B41J19/00—Character- or line-spacing mechanisms
    • B41J19/18—Character-spacing or back-spacing mechanisms; Carriage return or release devices therefor
    • B41J19/20—Positive-feed character-spacing mechanisms
    • 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
    • B41J11/20—Platen adjustments for varying the strength of impression, for a varying number of papers, for wear or for alignment, or for print gap adjustment

Definitions

  • the present invention relates to a printer. More particularly, the present invention relates to a printer of the type in which the quality of printed letters is significantly influenced by a slight change of the space between the top end of a printing head and the surface of a recording paper, such as a dot printer.
  • the paper thickness is changed when the number of recording papers is increased or decreased or when a chit or the like is selectively inserted in ordinary recording papers and printing is carried out in this state.
  • the quality of printed letters should be uni- formalized by changing and adjusting the relative position of the printing head to the platen. This can be achieved by detecting the paper thickness and determining the position of the printing head according to the detected thickness.
  • Various means have been proposed and adopted for attaining this purpose. For example, US-A-3,988,984 discloses a printer provided with such means. The printer disclosed in this U.S.
  • Patent is not different from the conventional printer in that a printing head is disposed reciprocatively movably on the front face of a cylindrical. platen horizontally located, but in this printer, a detecting roller engaging with recording papers wound around the platen is attached to a lever in the lower portion of the platen.
  • This lever is connected to a lever on the side of the printing head through a rotary shaft or other connecting lever, so that the position of the printing head is determined by the movement of this lever.
  • a complicated lever mechanism should inevitably be interposed. Therefore, the number of connecting and coupling members is large and the structure is commensurately complicated.
  • a printer comprising an assembly of a paper press roller, a printing head and a printing head carriage therefor, said assembly comprising a pair of parallel shafts spaced from each other, the first shaft bearing the press rollers, and the second shaft carrying the carriage, said shafts being carried by two pairs of levers of which each constitutes a joint linkage so that the position of the rollers dictates the position of the carriage.
  • the printing position also moves relatively upward and downward as the paper thickness changes.
  • the present invention is characterized in that the press rollers contact the paper in use immediately downstream of the printing head whereby the position of the printing head can be precisely determined according to the thickness of the papers utilized.
  • a pair of confronting frames 1 are disposed on the left and right sides, respectively, and levers 2 and 3 are held on the outer surfaces of the frames 1 so that the levers can turn along the frames 1 with shafts 8 being as the centers.
  • Both the ends of a guide shaft 6 slidably supporting a carrier 5 having a printing head 4 for a dot printer stationarily assembled thereon are supported on the levers 2 and 3.
  • Both the ends of another guide shaft 7 are supported on the frames 1 in the state where the shaft 7 is gripped in the rear portion of the carrier 5.
  • Fig. 2 is a side view in which the frames 1 are omitted to show the arrangement of parts.
  • a motor 9 is secured to one frame 1 and gears 11, 12, 13, 14, 15 and 16 from a gear train to reduce the rotational speed of the motor 9 and transmit the reduced rotational speed to a cam 10.
  • a paper feed cam 17 is disposed so that the cam 17 rotates coaxially with the gear 12.
  • the cam 10 has a drum-like shape, and on the periphery of the cam 10, there is formed an endless spiral groove 18 starting from one end, extending to the other end and returning to said one end.
  • a cam follower 19 to be engaged with this groove 18 is supported on the carrier 4 rotatably around the vertical axis.
  • a guide plate 21 is disposed between said frames 1 to guide a long recording paper 20 to a platen 25, and shafts 24 having paper feed rollers 22 and 23 fixed thereon are rotatably supported between the frames 1.
  • a paper pressing roller 26 confronting the upper paper feed roller 22 is fitted in and held on a shaft 27 having both the ends supported on the levers 2 and 3.
  • a pinch roller 28 as a pressing member confronting the lower paper feed roller 23 is supported by another lever 29.
  • Ratchets 30 are fixed to one end of the shafts 24 of the paper feed rollers 22 and 23, respectively.
  • a seesaw lever 31 having one end confronting the paper feed cam 17 is attached to one frame 1 while the seesaw lever 31 is rotatably urged clockwise by a return spring 32.
  • a stop lever 33 and a magnet 34 are held on one frame 1 so that the other end of the seesaw lever 31 is locked.
  • a feed lever 35 to be engaged with the above-mentioned ratchet 30 is connected to the seesaw lever 31.
  • a stopper 36 for regulating the range of the turning movement of the lever 2 a switch 37 as detecting means, which is switched off by movement of the lever 2 in the counterclockwise direction to open a printing driving circuit, and a toggle spring 38 for urging the lever 2 in the clockwise or counterclockwise direction every time the lever 2 turns from one side to the other side with the neutral position being the center, are attached to the frame 1.
  • a printing ribbon 40 having both the ends held by spools 39 is located on the front face of the platen 25.
  • the rotation of the motor 9 is transmitted to the cam 10 through the gears 11 through 16, and the carrier 5 having the cam follower 19 engaged with the groove 18 of the rotating cam 10 makes a reciprocative movement along the guide shafts 6 and 7 while the carrier 5 holds the printing head 4 thereon.
  • the printing operation is performed. While the other cam 17 is being rotated, the seesaw lever 31 is pressed by a high part of the cam 17 and turned in the counterclockwise direction, and at this point, the magnet 34 is energized to attract the stop lever 23 in the counterclockwise direction.
  • the seesaw lever 31 is turned in the clockwise direction by the force of the spring 32 to bring down the feed lever 35 and intermittently turn the ratchet 30, and the paper feed rollers 22 and 23 feed the recording paper 20 by one pitch.
  • the groove 18 is extended in a direction rectangular to the axis of the cam 10, only the movement of the carrier 5 and printing head 4 in a direction separating from (or approaching to) the platen 25 is allowed while the movement of the carrier 5 and printing head 4 along the platen 25 is inhibited. Accordingly, the chit 41 can easily be inserted on the front face of the platen 25. Then, the levers 2 and 3 are returned in the clockwise direction and the paper press roller 26 is brought into engaging contact with the paper feed roller 22 by the force of the toggle spring 38.
  • a clearance between the top end of the printing head 4 and the platen 25 can be adjusted to a predetermined size by a one- touch operation.
  • the switch 37 detects the position of the lever 2 to put off the printing driving circuit, and therefore, an erroneous operation can effectively be prevented.
  • the printed chit 41 is fed upwardly by the upper paper feed roller 22.
  • the feed quantity of the upper paper feed roller 22 is made slightly larger than the feed quantity of the paper feed roller 23 in printing the printing paper 20, even when the recording paper 20 is slackened between the paper feed rollers 22 and 23, an upward tension is given to the recording paper 20 and the slack can be eliminated. Accordingly, by this arrangement, the recording paper 20 can be set on the platen 25 horizontally and catching of a dot needle can be prevented.
  • the levers 2 and 3 are moved by a manual operation.
  • the levers 2 and 3 are moved by an electrical driving system using solenoids or the like.
  • the top ends of the levers 2 and 3 are not protruded from a cabinet and an operation switch button or the like is attached.
  • a display device be disposed to indicate whether the levers 2 and 3 are located at positions capable of receiving a chit 41 or the like or they are in the paper-pressing state.

Landscapes

  • Common Mechanisms (AREA)
  • Handling Of Sheets (AREA)
  • Handling Of Cut Paper (AREA)
  • Accessory Devices And Overall Control Thereof (AREA)

Claims (5)

1. Druckwerk mit einer Anordnung aus einer Papier-Anpreßrolle (26) und einem Druckkopf (4) sowie einem entlang einer Platte (25) hin- und herbewegbaren Druckkopf-Wagen (5) für den Druckkopf, welche genannte Anordnung ein Paar mit gegenseitigem Abstand angeordneter, paralleler Wellen oder Achsen aufweist, wobei die erste Welle die Anpreßrolle (n) (26) und die zweite Welle den Wagen (5) trägt, so daß die Position der Anpreßrollen (26) die Stellung des Wagens und dessen Abstand vom Aufzeichnungspapier bestimmt, dadurch gekennzeichnet, daß die Anpreßrolle (26) das Papier in Benutzung dem Druckkopf unmittelbar vorlaufend berührt, wodurch die Position des Druckkopfes (4) entsprechend der Dicke des benutzen Papiers (20) präzise bestimmt werden kann, und daß beide genannten Wellen an einem Paar Hebel (2, 3) befestigt sind.
2. Druckwerk nach Anspruch 1, dadurch gekennzeichnet, daß eine Papier-Vorschubrolle (22) in Eingriffsberührung mit der Papier-Anpreßrolle (26) angeordnet ist.
3. Druckwerk nach den Ansprüchen 1 oder 2, dadurch gekennzeichnet, daß Papiervorschubrollen (22, 23) jeweils oberhalb und unterhalb einer Platte (25) für den Vorschub des Aufzeichnungspapiers angeordnet sind und daß die Papier-Vorschubgeschwindigkeit der vorlaufenden Papier-Vorschubrolle (22) etwas größer ist als die Papier-Vorschubgeschwindigkeit der nachlaufenden Papier-Vorschubrolle (23).
4. Druckwerk nach irgendeinem der Ansprüche 1 bis 3, in welcher die Hebel (2, 3) durch eine Schnappfeder-Anordnung (38) derart beaufschlagt sind, daß die Hebel durch die Schnappfeder entweder in eine Papier-Anpreßrichtung oder in eine Richtung zur Papier-Einführung beaufschlagt werden können.
5. Druckwerk nach Anspruch 4, in welcher ein Meßfühler (37) zum Feststellen der Stellung des Hebels (2) angeordnet ist, so daß eine Druck-Antriebsschaltung ausgeschaltet ist, wenn sich der Hebel in der Papier-Einführstellung befindet.
EP81301179A 1980-03-25 1981-03-19 Druckwerk Expired EP0037217B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP3893980U JPS56140452U (de) 1980-03-25 1980-03-25
JP38939/80U 1980-03-25

Publications (2)

Publication Number Publication Date
EP0037217A1 EP0037217A1 (de) 1981-10-07
EP0037217B1 true EP0037217B1 (de) 1985-06-19

Family

ID=12539189

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81301179A Expired EP0037217B1 (de) 1980-03-25 1981-03-19 Druckwerk

Country Status (4)

Country Link
EP (1) EP0037217B1 (de)
JP (1) JPS56140452U (de)
CA (1) CA1159711A (de)
DE (1) DE3170991D1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6074032A (en) * 1995-06-30 2000-06-13 Canon Kabushiki Kaisha Recording apparatus having a pivotable member to maintain a constant distance and angle between a recording head and a recording medium
JPH1044541A (ja) * 1996-08-01 1998-02-17 Canon Inc 記録装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2550963A1 (de) * 1974-12-31 1976-07-08 Zentronik Veb K Druckeinrichtung
US3988984A (en) * 1974-11-06 1976-11-02 U.S. Philips Corporation Printing device comprising a distance roller
DE2635006A1 (de) * 1976-08-04 1978-02-09 Helmut Steinhilber Vorrichtung zur automatischen abstandsregelung zwischen einem druckkopf und einem zu bedruckenden informationstraeger
DE2248262B2 (de) * 1972-10-02 1978-04-27 Walther-Bueromaschinen Gmbh, 7921 Gerstetten Selbsttätige Materialstärken-Abfühlvorrichtung des Aufzeichnungsträgers für Schnelldruckwerke in Büromaschinen

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2516149C3 (de) * 1975-04-11 1983-01-05 Mannesmann AG, 4000 Düsseldorf Vorrichtung zum Konstanthalten des Abstandes des Druckkopfes eines Matrixdruckers vom Aufzeichnungsträger

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2248262B2 (de) * 1972-10-02 1978-04-27 Walther-Bueromaschinen Gmbh, 7921 Gerstetten Selbsttätige Materialstärken-Abfühlvorrichtung des Aufzeichnungsträgers für Schnelldruckwerke in Büromaschinen
US3988984A (en) * 1974-11-06 1976-11-02 U.S. Philips Corporation Printing device comprising a distance roller
DE2550963A1 (de) * 1974-12-31 1976-07-08 Zentronik Veb K Druckeinrichtung
DE2635006A1 (de) * 1976-08-04 1978-02-09 Helmut Steinhilber Vorrichtung zur automatischen abstandsregelung zwischen einem druckkopf und einem zu bedruckenden informationstraeger

Also Published As

Publication number Publication date
DE3170991D1 (en) 1985-07-25
CA1159711A (en) 1984-01-03
EP0037217A1 (de) 1981-10-07
JPS56140452U (de) 1981-10-23

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