EP0856412A2 - Platen-gap regulating apparatus - Google Patents

Platen-gap regulating apparatus Download PDF

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Publication number
EP0856412A2
EP0856412A2 EP98101615A EP98101615A EP0856412A2 EP 0856412 A2 EP0856412 A2 EP 0856412A2 EP 98101615 A EP98101615 A EP 98101615A EP 98101615 A EP98101615 A EP 98101615A EP 0856412 A2 EP0856412 A2 EP 0856412A2
Authority
EP
European Patent Office
Prior art keywords
platen
carriage
gap
guide members
regulating apparatus
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.)
Granted
Application number
EP98101615A
Other languages
German (de)
French (fr)
Other versions
EP0856412A3 (en
EP0856412B1 (en
Inventor
Takeo Kishida
Kiyoto Komuro
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.)
Seiko Epson Corp
Original Assignee
Seiko Epson 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 Seiko Epson Corp filed Critical Seiko Epson Corp
Publication of EP0856412A2 publication Critical patent/EP0856412A2/en
Publication of EP0856412A3 publication Critical patent/EP0856412A3/en
Application granted granted Critical
Publication of EP0856412B1 publication Critical patent/EP0856412B1/en
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
    • B41J25/00—Actions or mechanisms not otherwise provided for
    • B41J25/304—Bodily-movable mechanisms for print heads or carriages movable towards or from paper surface
    • B41J25/308—Bodily-movable mechanisms for print heads or carriages movable towards or from paper surface with print gap adjustment mechanisms
    • B41J25/3088—Bodily-movable mechanisms for print heads or carriages movable towards or from paper surface with print gap adjustment mechanisms with print gap adjustment means on the printer frame, e.g. for rotation of an eccentric carriage guide shaft
    • 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
    • B41J23/00—Power drives for actions or mechanisms
    • B41J23/02—Mechanical power drives
    • B41J23/025—Mechanical power drives using a single or common power source for two or more functions
    • 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
    • B41J25/00—Actions or mechanisms not otherwise provided for
    • B41J25/304—Bodily-movable mechanisms for print heads or carriages movable towards or from paper surface
    • B41J25/308—Bodily-movable mechanisms for print heads or carriages movable towards or from paper surface with print gap adjustment mechanisms

Definitions

  • the present invention relates to an platen-gap regulating apparatus for regulating the space between a platen and a recording head in proportion to the thickness of a recording medium.
  • a typical conventional platen-gap regulating apparatus for regulating a gap between a platen and a recording head in proportion to the thickness of a recording medium is, as shown in Fig. 6, adapted to change the distance from a platen face or a printing reference position to a recording head h by rotating a guide member g1 situated closer to the recording head h out of a pair of guide members g1, g2 for guiding a carriage c by the displacement quantity of an eccentric shaft.
  • the recording head h in a conventional printer is turned by an angle ⁇ equivalent to a gap regulating quantity ⁇ centering on the other guide member g2 before and after the gap is adjusted, the parallelism between the recording medium s and the recording head h is spoiled by the angle ⁇ ; this results in inconvenience in that the printing position is displaced to that degree in the direction of a line or otherwise an image is deformed lengthwise in the direction of the line.
  • the trouble is that the tone and the like are affected by the aforementioned displacement or deformation.
  • An object of the present invention made in view of the foregoing problems is to provide a novel platen-gap regulating apparatus which is free from causing an image to be badly affected before and after the gap is adjusted.
  • Another object of the present invention is to provide a novel platen-gap regulating apparatus capable of automatically moving a recording head to an optimum position of a recording medium and in parallel to the recording medium.
  • a platen-gap regulating apparatus for regulating a carriage with respect to a platen of a printer
  • the platen-gap regulating apparatus comprising: a pair of guide members rotatably mounted on the printer via an eccentric portion, for running the carriage; and regulating means for imparting the same rotational displacement quantity to both the guide members, wherein the carriage is separated from and drawn near to a printing reference plane in parallel thereto.
  • the regulating means regulates both the guide members forwardly and reversely by the same quantity in the same direction in response to the forward and reverse rolling of paper-feed driving means, and the regulating means engages with or detaches from both the guide members in response to moving the carriage.
  • FIG. 5 first, there is given a description of a printer under an ink-jet recording system using a platen-gap regulating apparatus according to the embodiemnt of the present invention.
  • reference numeral 1 denotes a carriage for running a recording head that is carried by the carriage. Further, a pair of front and rear guide rods 3, 4 for guiding the carriage 1 are rotatably mounted on a guide frame (not shown) via eccentric pins 3a, 4a which are biased in the same direction and installed at both the respective ends of the carriage 1.
  • the guide rods 3, 4 are operated by a carriage regulating unit 10, which will be described later, so that the guide rods are turned in the same direction, the carriage 1 which the guide rods 3, 4 support is separated from or drawn near to a platen or a printing reference plane p in the absence of such a platen.
  • reference numeral 6 denotes a paper feed roller; and 7, a paper discharge roller.
  • Figs. 1 - 4 show a gap regulating unit 10 according to an embodiment of the present invention, which gap regulating unit 10 is mounted on a side frame on one side of a printer body (not shown) via a unit frame 11.
  • the gap regulating unit 10 is operated by the carriage thus moved, it is driven by a paper feeding motor (not shown) to turn the two guide rods 3, 4 by the same quantity.
  • a switch lever 13 which is displaced toward a position where it engages with an intermediate gear 20, which will also be described later, when it is pressed by the carriage 1 is supported pivotally, rotatably, and slidably in the axial direction at the end of a paper discharge roller shaft 8 driven by the paper feeding roller (not shown), the rotation of the paper discharge roller shaft 8 being integral with that of the paper discharge roller 7.
  • the switch lever 13 is thus supported in such a state that it is urged by a spring 19 installed with respect to the unit frame 11 and always held in a non-engaging position.
  • a sun gear 16 is slidably fitted to the square shaft portion 8a of the paper discharge roller shaft 8 in the center of the switch lever 13. Further, two different-in-level planet gears 17, 18 which are kept in engagement with the sun gear 16 are supported on both sides of the switch lever 13, respectively.
  • the switch lever 13 is pressed by the carriage 1 and displaced, one of the planet gears 17, 18 is used to transmit gap regulating torque to the intermediate gear 20 according to the direction in which the paper feeding motor is rotated.
  • the intermediate gear 20 is, as shown in Fig. 3, formed with two different-in-level gear portions without teeth 21, 22 having a phase difference so that these gear portions selectively engage with the planet gears 17, 18, and a deformed Geneva gear portion 23 which engages with and disengages from a sector gear 25, which will be described later.
  • the intermediate gear 20 is rotated by a predetermined quantity, irrespective of the rotational quantity of the planet gears 17, 18, so as to rotate the sector gear 25 by a predetermined angle.
  • the sector gear 25 is fixed to the end portion 3b of one guide rod 3 so that it is rotated integrally with the guide rod 3. Further, a small fan-shaped gear 26 which is integral with the sector gear 25 engages with an airfoil sector gear 27 installed between both the guide rods 3, 4 in order that unidirectional torque is transmitted via the gear 27 to a small fan-shaped gear 28 fixed to the end of the shaft 4b of the other guide rod 4.
  • reference numeral 14 denotes a pawl formed on the back surface of the switch lever 13 and used to hold the switch lever 13 always in the non-engaging position by mating with an arcuate mating hole 12 bored in the unit frame 11.
  • the recording head 2 is made to hold a gap matching the thickness of ordinary paper by turning and positioning the two guide rods 3, 4 so as to keep the eccentric pins 3a, 4a substantially horizontally via the small fan-shaped gears 26, 28 engaging with the airfoil sector gear 27 as shown in Figs. 1, 5 in such a normal state that information is recorded/written onto the ordinary paper.
  • an operating button on a panel (not shown) is depressed or an instruction as to permitting the platen gap to be altered is given from a personal computer in order to record/write information onto thick recording paper such as special paper for color printing, postcards and so on to move the carriage 1 to a platen-gap switching position at the beginning of the recording-writing operation, whereby the carriage 1 presses down part of the switch lever 13 with its projected end portion 1a with the effect of displacing the switch lever 13 toward the engaging position shown by a chain double-dashed line of Fig. 4.
  • the paper feeding motor (not shown) simultaneously rotates the paper discharge roller shaft 8 counterclockwise to turn the switch lever 13 counterclockwise via the planet gears 17, 18 engaging with the sun gear 16 at the end of the paper discharge roller shaft 8.
  • the one planet gear 17 is caused to engage with and rotate the intermediate gear 20 in the direction of an arrow in the drawing and then rotates the sector gear 25 by the predetermined quantity up to a position where the sector gear 25 engaging with the deformed Geneva gear portion 23 of the intermediate gear 20 is brought into contact with a stopper 23a.
  • the guide rod 3 integral with the sector gear 25 is turned clockwise in the drawing and the airfoil sector gear 27 is rotated in the direction of an arrow in the drawing via the small fan-shaped gear 26 integral with the sector gear 25.
  • the other guide rod 4 is turned in the same direction via the other small fan-shaped gear 28 engaging with the airfoil sector gear 27, and the carriage 1 is raised in parallel to the printing reference plane p by means of both the guide rods 3, 4.
  • the platen-gap regulating apparatus When the platen-gap regulating apparatus is adapted for thin recording paper, it is needless to say only needed to regulate the platen gap by reversely rotating the paper feeding motor.
  • two of the front and rear guide rods 3, 4 may be displaced manually in the same direction in order to displace the carriage 1 or the recording head 2 itself in parallel.
  • the carriage supported and guided by these guide members can always be regulated in parallel to the printing reference plane in proportion to the thickness of a recording medium, whereby print quality is held to be constant at all times, irrespective of the gap regulating operation.
  • the regulating means for regulating the carriage in the direction in which the carriage is separated from and drawn near to the printing reference plane according to the forward and reverse rotation of the paper-feed driving means is capable of engaging detachably with the guide members in such a way that the engagement of the regulating means therewith is interlocked with the movement of the carriage, the gap regulating operation is automatically performable only when the gap adjustment is made in accordance with a recording medium for printing.

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  • Common Mechanisms (AREA)

Abstract

A platen-gap regulating apparatus for regulating a carriage with respect to a platen of a printer, comprises: a pair of guide members rotatably mounted on the printer via an eccentric portion, for running the carriage; and regulating means for imparting the same rotational displacement quantity to both the guide members, wherein the carriage is separated from and drawn near to a printing reference plane in parallel thereto.

Description

BACKGROUND OF INVENTION
The present invention relates to an platen-gap regulating apparatus for regulating the space between a platen and a recording head in proportion to the thickness of a recording medium.
A typical conventional platen-gap regulating apparatus for regulating a gap between a platen and a recording head in proportion to the thickness of a recording medium is, as shown in Fig. 6, adapted to change the distance from a platen face or a printing reference position to a recording head h by rotating a guide member g1 situated closer to the recording head h out of a pair of guide members g1, g2 for guiding a carriage c by the displacement quantity of an eccentric shaft.
Since the recording head h in a conventional printer is turned by an angle Δ equivalent to a gap regulating quantity δ centering on the other guide member g2 before and after the gap is adjusted, the parallelism between the recording medium s and the recording head h is spoiled by the angle Δ; this results in inconvenience in that the printing position is displaced to that degree in the direction of a line or otherwise an image is deformed lengthwise in the direction of the line. In the case of a printer for forming color images in particular, the trouble is that the tone and the like are affected by the aforementioned displacement or deformation.
SUMMARY OF INVENTION
An object of the present invention made in view of the foregoing problems is to provide a novel platen-gap regulating apparatus which is free from causing an image to be badly affected before and after the gap is adjusted.
Another object of the present invention is to provide a novel platen-gap regulating apparatus capable of automatically moving a recording head to an optimum position of a recording medium and in parallel to the recording medium.
In order to accomplish the objects above, there is provided a platen-gap regulating apparatus according to the present invention, for regulating a carriage with respect to a platen of a printer, the platen-gap regulating apparatus comprising: a pair of guide members rotatably mounted on the printer via an eccentric portion, for running the carriage; and regulating means for imparting the same rotational displacement quantity to both the guide members, wherein the carriage is separated from and drawn near to a printing reference plane in parallel thereto.
Furthemore, in the platen-gap regulating apparatus described above, the regulating means regulates both the guide members forwardly and reversely by the same quantity in the same direction in response to the forward and reverse rolling of paper-feed driving means, and the regulating means engages with or detaches from both the guide members in response to moving the carriage.
BRIEF DESCRIPTION OF DRAWINGS
  • Fig. 1 is a side view of a platen-gap regulating apparatus according to an embodiment of the present invention in a normal state;
  • Fig. 2 is a side view of the apparatus above when an adjustment is made to enlarge the gap;
  • Figs. 3(a) and 3(b) are a plan and a sectional view of an intermediate gear for use in the apparatus above;
  • Fig. 4 is a diagram of the principal part of the apparatus above by reference to the movement of a carriage;
  • Fig. 5 is a diagram showing an example of a printer using the apparatus above; and
  • Fig. 6 is a diagram depicting problems concerning a conventional apparatus.
    • DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
    An embodiment of the present invention will subsequently be described.
    All of the accompanying drawings show an embodiment of the present invention.
    Referring to Fig. 5 first, there is given a description of a printer under an ink-jet recording system using a platen-gap regulating apparatus according to the embodiemnt of the present invention.
    In Fig. 5, reference numeral 1 denotes a carriage for running a recording head that is carried by the carriage. Further, a pair of front and rear guide rods 3, 4 for guiding the carriage 1 are rotatably mounted on a guide frame (not shown) via eccentric pins 3a, 4a which are biased in the same direction and installed at both the respective ends of the carriage 1. When the guide rods 3, 4 are operated by a carriage regulating unit 10, which will be described later, so that the guide rods are turned in the same direction, the carriage 1 which the guide rods 3, 4 support is separated from or drawn near to a platen or a printing reference plane p in the absence of such a platen.
    In this case, reference numeral 6 denotes a paper feed roller; and 7, a paper discharge roller.
    Figs. 1 - 4 show a gap regulating unit 10 according to an embodiment of the present invention, which gap regulating unit 10 is mounted on a side frame on one side of a printer body (not shown) via a unit frame 11. When the gap regulating unit 10 is operated by the carriage thus moved, it is driven by a paper feeding motor (not shown) to turn the two guide rods 3, 4 by the same quantity.
    A detailed description will subsequently be given of the gap regulating unit 10. A switch lever 13 which is displaced toward a position where it engages with an intermediate gear 20, which will also be described later, when it is pressed by the carriage 1 is supported pivotally, rotatably, and slidably in the axial direction at the end of a paper discharge roller shaft 8 driven by the paper feeding roller (not shown), the rotation of the paper discharge roller shaft 8 being integral with that of the paper discharge roller 7. The switch lever 13 is thus supported in such a state that it is urged by a spring 19 installed with respect to the unit frame 11 and always held in a non-engaging position.
    A sun gear 16 is slidably fitted to the square shaft portion 8a of the paper discharge roller shaft 8 in the center of the switch lever 13. Further, two different-in- level planet gears 17, 18 which are kept in engagement with the sun gear 16 are supported on both sides of the switch lever 13, respectively. When the switch lever 13 is pressed by the carriage 1 and displaced, one of the planet gears 17, 18 is used to transmit gap regulating torque to the intermediate gear 20 according to the direction in which the paper feeding motor is rotated.
    On the other hand, the intermediate gear 20 is, as shown in Fig. 3, formed with two different-in-level gear portions without teeth 21, 22 having a phase difference so that these gear portions selectively engage with the planet gears 17, 18, and a deformed Geneva gear portion 23 which engages with and disengages from a sector gear 25, which will be described later. The intermediate gear 20 is rotated by a predetermined quantity, irrespective of the rotational quantity of the planet gears 17, 18, so as to rotate the sector gear 25 by a predetermined angle.
    On the contrary, the sector gear 25 is fixed to the end portion 3b of one guide rod 3 so that it is rotated integrally with the guide rod 3. Further, a small fan-shaped gear 26 which is integral with the sector gear 25 engages with an airfoil sector gear 27 installed between both the guide rods 3, 4 in order that unidirectional torque is transmitted via the gear 27 to a small fan-shaped gear 28 fixed to the end of the shaft 4b of the other guide rod 4.
    In this case, reference numeral 14 denotes a pawl formed on the back surface of the switch lever 13 and used to hold the switch lever 13 always in the non-engaging position by mating with an arcuate mating hole 12 bored in the unit frame 11.
    With the arrangement above according to this embodiment of the present invention, the recording head 2 is made to hold a gap matching the thickness of ordinary paper by turning and positioning the two guide rods 3, 4 so as to keep the eccentric pins 3a, 4a substantially horizontally via the small fan- shaped gears 26, 28 engaging with the airfoil sector gear 27 as shown in Figs. 1, 5 in such a normal state that information is recorded/written onto the ordinary paper.
    In that state, the pawl 14 projecting from the back surface of the switch lever 13 engages with the arcuate mating hole 12 of the unit frame 11 and holds the switch lever 13 in the position shown by a solid line of Fig. 4, that is, the non-engaging position.
    In that state, further, an operating button on a panel (not shown) is depressed or an instruction as to permitting the platen gap to be altered is given from a personal computer in order to record/write information onto thick recording paper such as special paper for color printing, postcards and so on to move the carriage 1 to a platen-gap switching position at the beginning of the recording-writing operation, whereby the carriage 1 presses down part of the switch lever 13 with its projected end portion 1a with the effect of displacing the switch lever 13 toward the engaging position shown by a chain double-dashed line of Fig. 4.
    On the other hand, the paper feeding motor (not shown) simultaneously rotates the paper discharge roller shaft 8 counterclockwise to turn the switch lever 13 counterclockwise via the planet gears 17, 18 engaging with the sun gear 16 at the end of the paper discharge roller shaft 8. Further, the one planet gear 17 is caused to engage with and rotate the intermediate gear 20 in the direction of an arrow in the drawing and then rotates the sector gear 25 by the predetermined quantity up to a position where the sector gear 25 engaging with the deformed Geneva gear portion 23 of the intermediate gear 20 is brought into contact with a stopper 23a. Further, the guide rod 3 integral with the sector gear 25 is turned clockwise in the drawing and the airfoil sector gear 27 is rotated in the direction of an arrow in the drawing via the small fan-shaped gear 26 integral with the sector gear 25. Further, the other guide rod 4 is turned in the same direction via the other small fan-shaped gear 28 engaging with the airfoil sector gear 27, and the carriage 1 is raised in parallel to the printing reference plane p by means of both the guide rods 3, 4.
    When the platen-gap regulating apparatus is adapted for thin recording paper, it is needless to say only needed to regulate the platen gap by reversely rotating the paper feeding motor.
    Although a description has been given of a case where the carriage 1 is automatically displaced by the paper feeding motor in parallel to the printing reference plane p via the guide rods 3, 4 in the above-described embodiment of the present invention, two of the front and rear guide rods 3, 4 may be displaced manually in the same direction in order to displace the carriage 1 or the recording head 2 itself in parallel.
    As set forth above, according to the present invention, since the pair of guide members for running the carriage mounted on the printer body are subjected to the same quantity of rotational adjustment of the sort described above via the eccentric portion, the carriage supported and guided by these guide members can always be regulated in parallel to the printing reference plane in proportion to the thickness of a recording medium, whereby print quality is held to be constant at all times, irrespective of the gap regulating operation.
    Since the regulating means for regulating the carriage in the direction in which the carriage is separated from and drawn near to the printing reference plane according to the forward and reverse rotation of the paper-feed driving means is capable of engaging detachably with the guide members in such a way that the engagement of the regulating means therewith is interlocked with the movement of the carriage, the gap regulating operation is automatically performable only when the gap adjustment is made in accordance with a recording medium for printing.

    Claims (5)

    1. A platen-gap regulating apparatus for regulating a carriage with respect to a platen of a printer, the platen-gap regulatig apparatus comprising:
      a pair of guide members rotatably mounted on the printer via an eccentric portion, for running the carriage; and
      regulating means for imparting the same rotational displacement quantity to both the guide members, wherein the carriage is separated from and drawn near to a printing reference plane in parallel thereto.
    2. The platen-gap regulating apparatus as claimed in claim 1, wherein the regulating means regulates both the guide members forwardly and reversely by the same quantity in the same direction in response to the forward and reverse rolling of paper-feed driving means, and the regulating means engages with or detaches from both the guide members in response to moving the carriage.
    3. A platen-gap regulating apparatus in a printer in which a carriage is moved along a pair of guide rods, the platen-gap regulating apparatus comprising:
      eccentric pins, each eccentricaly supporting the respective guide rod on the printer; and
      a linking portion liking to the eccentric pins, for moving the eccentric pins such that the guide members are moved in parallel by the eccentric pins.
    4. The platen-gap regulating apparatus according to claim 3, wherein the linking portion comprises:
      small fan-shaped gears, each fixed to the respective eccentric pin; and
      an airfoil sector gear having sector gear portions engaging with the small fan-shaped gears of the eccentric pins.
    5. The platen-gap regulating apparatus according to claim 4, further comprising:
      a sector gear pivotable together with one of the eccentric pins;
      an intermediate gear engaging with the sector gear; and
      a switch lever selsectively driving the intermediate gear.
    EP19980101615 1997-01-30 1998-01-30 Platen-gap regulating apparatus Expired - Lifetime EP0856412B1 (en)

    Applications Claiming Priority (3)

    Application Number Priority Date Filing Date Title
    JP3111597A JPH10211748A (en) 1997-01-30 1997-01-30 Platen gap adjusting apparatus
    JP31115/97 1997-01-30
    JP3111597 1997-01-30

    Publications (3)

    Publication Number Publication Date
    EP0856412A2 true EP0856412A2 (en) 1998-08-05
    EP0856412A3 EP0856412A3 (en) 1999-10-27
    EP0856412B1 EP0856412B1 (en) 2001-04-04

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    Family Applications (1)

    Application Number Title Priority Date Filing Date
    EP19980101615 Expired - Lifetime EP0856412B1 (en) 1997-01-30 1998-01-30 Platen-gap regulating apparatus

    Country Status (3)

    Country Link
    EP (1) EP0856412B1 (en)
    JP (1) JPH10211748A (en)
    DE (1) DE69800651T2 (en)

    Cited By (1)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    EP1475236A1 (en) * 2003-05-08 2004-11-10 Seiko Epson Corporation Gap adjusting device, recording apparatus and liquid ejection apparatus

    Families Citing this family (7)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    JP4009936B2 (en) 2001-02-09 2007-11-21 セイコーエプソン株式会社 Inkjet recording device
    US7481527B2 (en) 2004-02-17 2009-01-27 Seiko Epson Corporation Liquid ejection apparatus
    JP4670466B2 (en) 2005-05-12 2011-04-13 セイコーエプソン株式会社 Platen gap adjusting device, printing device, and combined processing device
    JP5171236B2 (en) * 2007-12-14 2013-03-27 キヤノン株式会社 Recording device
    US8768215B2 (en) 2010-05-10 2014-07-01 Canon Kabushiki Kaisha Image forming apparatus
    RU2494424C2 (en) * 2011-10-07 2013-09-27 Общество с ограниченной ответственностью "Фирма "Радиус-Сервис" Video endoscope for inspecting inner surfaces of tubular articles
    JP6218196B2 (en) * 2016-03-23 2017-10-25 株式会社東海理化電機製作所 Gear drive

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    Publication number Priority date Publication date Assignee Title
    JPS6378783A (en) * 1986-09-22 1988-04-08 Silver Seiko Ltd Carrier apparatus of printer
    EP0450748A1 (en) * 1990-01-31 1991-10-09 Brother Kogyo Kabushiki Kaisha Dot matrix printer having a print head position adjusting feature dependent on thermal deformation of platen
    US5156466A (en) * 1989-10-18 1992-10-20 Fujitsu Limited Method and apparatus for adjusting the spacing between head and platen in an impact printer or the like
    EP0556066A2 (en) * 1992-02-13 1993-08-18 ITW Limited Print head movement control
    GB2300155A (en) * 1995-04-28 1996-10-30 Seiko Epson Corp Guide shaft assembly for a printer

    Patent Citations (5)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    JPS6378783A (en) * 1986-09-22 1988-04-08 Silver Seiko Ltd Carrier apparatus of printer
    US5156466A (en) * 1989-10-18 1992-10-20 Fujitsu Limited Method and apparatus for adjusting the spacing between head and platen in an impact printer or the like
    EP0450748A1 (en) * 1990-01-31 1991-10-09 Brother Kogyo Kabushiki Kaisha Dot matrix printer having a print head position adjusting feature dependent on thermal deformation of platen
    EP0556066A2 (en) * 1992-02-13 1993-08-18 ITW Limited Print head movement control
    GB2300155A (en) * 1995-04-28 1996-10-30 Seiko Epson Corp Guide shaft assembly for a printer

    Non-Patent Citations (1)

    * Cited by examiner, † Cited by third party
    Title
    PATENT ABSTRACTS OF JAPAN vol. 012, no. 302 (M-732), 17 August 1988 (1988-08-17) & JP 63 078783 A (SILVER SEIKO LTD), 8 April 1988 (1988-04-08) *

    Cited By (2)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    EP1475236A1 (en) * 2003-05-08 2004-11-10 Seiko Epson Corporation Gap adjusting device, recording apparatus and liquid ejection apparatus
    CN1294027C (en) * 2003-05-08 2007-01-10 精工爱普生株式会社 Gap adjusting device, recording apparatus and liquid ejection apparatus

    Also Published As

    Publication number Publication date
    DE69800651T2 (en) 2001-08-09
    EP0856412A3 (en) 1999-10-27
    EP0856412B1 (en) 2001-04-04
    JPH10211748A (en) 1998-08-11
    DE69800651D1 (en) 2001-05-10

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