WO1997027055A1 - Dispositif de formation d'images a jet d'encre - Google Patents
Dispositif de formation d'images a jet d'encre Download PDFInfo
- Publication number
- WO1997027055A1 WO1997027055A1 PCT/JP1997/000114 JP9700114W WO9727055A1 WO 1997027055 A1 WO1997027055 A1 WO 1997027055A1 JP 9700114 W JP9700114 W JP 9700114W WO 9727055 A1 WO9727055 A1 WO 9727055A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- recording paper
- image forming
- ink
- position regulating
- regulating member
- Prior art date
Links
Classifications
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- 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
- B41J13/10—Sheet holders, retainers, movable guides, or stationary guides
- B41J13/14—Aprons or guides for the printing section
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- 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
- B41J11/0045—Guides for printing material
- B41J11/005—Guides in the printing zone, e.g. guides for preventing contact of conveyed sheets with printhead
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- 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 an ink jet type image forming apparatus that forms an image on a recording medium such as recording paper by discharging ink from a print head.
- an ink jet type image forming apparatus which forms an image on a recording medium such as recording paper by discharging ink.
- the ink jet image forming apparatus includes, for example, a print head having an ink discharge surface in which a plurality of ink discharge ports for discharging ink are formed, and a print head mounted in a predetermined direction.
- the carriage includes a carriage that reciprocates in a vertical direction and a recording paper transport device that transports the recording paper in a direction (recording paper transport direction) orthogonal to the predetermined direction.
- the recording paper being transported by the recording paper transport device is temporarily stopped, and the image carrying image information is carried out while the carriage is reciprocated in the above-mentioned predetermined direction.
- Ink is ejected from the ink ejection port based on the signal, and one band of image is formed (printed) on a portion of the recording paper located in the image forming area facing the ink ejection port.
- the paper is conveyed by a width of one band and stopped, and the ink is discharged from the ink discharge port based on the image signal while the carriage is reciprocated again in the above-described predetermined direction, and the recording is performed.
- An image is formed on a portion of the paper that is newly located in the image forming area.
- an image is formed on the entire surface of the recording paper.
- ink is ejected and discharged.
- the fibers of the recording paper that have absorbed the ink partially expand, causing a phenomenon (cockling) in which irregularities are formed in and around the expanded portion.
- the unevenness due to this cockling may not only be formed at the portion where image formation has been completed due to the adhesion of the ink, but may also grow significantly to the portion where the image is to be formed next.
- the printing position is slightly distorted, which adversely affects the image and deteriorates the image quality.
- the convex part of the recording paper comes into contact with the print head mounted on the carriage that reciprocates in a predetermined direction at high speed, and damages the precisely manufactured parts such as the ink discharge port. There is a risk.
- paper dust may adhere to the ink discharge port and the like, resulting in poor ink discharge and a decrease in image quality.
- Another technique for reducing cockling is when printing on chart paper. Then, the carriage is reciprocated (scanning) many times on the same surface (same band) of the recording paper, and the ink is ejected on the same surface of the recording paper in small portions.
- a technique called the multi-scan method for printing is proposed. However, in this technique, the carriage is scanned several times on the same surface, which takes time.
- the present invention has been made in view of the above circumstances, and an object of the present invention is to provide an ink jet type image forming apparatus in which image quality is improved by preventing damage to a print head due to cockling. Disclosure of the invention
- a first ink jet image forming apparatus comprises: a carriage having an ink ejection surface formed with a plurality of ink ejection ports for ejecting ink in a predetermined direction;
- the recording paper is conveyed in a direction intersecting the predetermined direction and the recording paper is conveyed in a direction that is located in the image forming area in front of the ink discharge surface.
- a first transport member which is located upstream of the image forming area in the recording paper transport direction and transports the recording paper while nipping it
- a second transport member that is disposed downstream of the image forming area in the recording paper transport direction and transports the recording paper while nipping it.
- a first position regulating member disposed between the first transport member and the image forming area, which regulates the position of the recording sheet by pressing one of the two sides of the recording sheet.
- both the first position regulating member and the second position regulating member extend in a predetermined direction in which the ink discharge surface reciprocates.
- At least one of the first position regulating member and the second position regulating member has a force s and is a thin line-shaped member stretched in a predetermined direction.
- a second ink jet type image forming apparatus of the present invention includes a carriage having an ink ejection surface formed with a plurality of ink ejection ports for ejecting an ink in a predetermined direction.
- the recording paper is conveyed in a direction intersecting the predetermined direction, and the ink ejection is performed based on the image information in a portion of the recording paper located in the image forming area in front of the ink ejection surface.
- a first transport member that is located upstream of the image forming area in the recording paper transport direction and transports the recording paper while nipping it.
- a second transport member that is disposed downstream of the image forming area in the recording paper transport direction and transports the recording paper while nipping it.
- a first position regulating member disposed between the first transport member and the image forming area, which regulates the position of the recording sheet by pressing one of the two sides of the recording sheet.
- the first position regulating member presses a surface facing the ink discharge surface of both sides of the recording paper.
- the second position regulating member presses the opposite side of the both sides of the recording paper from the side facing the ink discharge surface.
- a third ink jet image forming apparatus of the present invention comprises a carriage having an ink ejection surface formed with a plurality of ink ejection ports for ejecting ink in a predetermined direction.
- the recording paper is conveyed in a direction intersecting the predetermined direction, and the portion of the recording paper located in the image forming area in front of the ink ejection surface is linked based on the image information.
- an ink jet image forming apparatus that forms an image by discharging ink from a discharge port,
- a first transport member that is located upstream of the image forming area in the recording paper transport direction and transports the recording paper while nipping it
- a second transport member which is located downstream of the image forming area in the recording paper transport direction and transports the recording paper while holding it
- a second position regulating member disposed between the image forming region and the second conveying member, which pulls a portion located in the forming region and keeps a predetermined distance between the portion and the ink discharge surface;
- both the first and second position regulating members hold down the surface of the recording paper opposite to the surface facing the ink ejection surface.
- At least one of the first position regulating member and the second position regulating member is a thin wire.
- a fourth ink jet X-ray image forming apparatus is directed to a carriage having an ink ejection surface having a plurality of ink ejection ports for ejecting ink in a predetermined direction.
- the recording paper is conveyed in a direction intersecting the predetermined direction, and the portion of the recording paper located in the image forming area in front of the ink ejection surface is linked based on the image information.
- an ink jet type image forming apparatus that forms an image by discharging ink from a discharge port,
- the recording device is located upstream of the image forming area in the recording paper transport direction.
- First transport member that transports paper while holding it
- a second transport member that is disposed downstream of the image forming area in the recording paper transport direction and transports the recording paper while nipping it.
- the first and second position regulating members have a curved surface for holding the recording paper.
- a fifth ink jet image forming apparatus of the present invention comprises: a print head having an ink discharge port from which ink is discharged; Transporting the recording paper to the image forming area facing the ink discharge port, and ejecting ink from the ink discharge port while reciprocating the carriage in a predetermined direction to print the recording paper.
- a recording medium floating prevention member is provided upstream of the ink discharge port in the recording paper transport direction and near the ink discharge port, and is closer to the recording paper than the print head. It is assumed that. hand,
- the recording medium floating prevention member is a member in which a portion facing the recording paper is formed smoothly in the recording medium floating prevention member.
- the recording medium floating prevention member is preferably made of polyoxymethylene or a fluorine-containing resin.
- Polyoxymethylene also called polyacetal resin, is a tough plastic.
- the recording medium floating prevention member may be formed on a print head.
- the recording medium floating prevention member may be formed on a carriage.
- FIG. 1 is a perspective view showing a schematic configuration of a plotter which is a first embodiment of the ink jet type image forming apparatus of the present invention.
- FIG. 2 is a perspective view showing a transport path from the insertion of the recording paper to the discharge thereof in the plotter of FIG.
- FIG. 3 is a perspective view showing a printing unit of the plotter of FIG.
- FIG. 4 is a cross-sectional view showing the first position regulating member and the second position regulating member of FIG.
- FIG. 5 (a) is a schematic diagram showing the positional relationship when both the first and second position regulating members of FIG. 4 press the upper surface of the record ⁇ , and FIG. The position regulating member holds down the top surface of the recording paper, and the 2nd place g regulating member records
- FIG. 4 is a schematic diagram illustrating a positional relationship when the lower surface of the paper is pressed
- FIG. 4C illustrates a positional relationship when the first position restricting member presses the lower surface of the recording paper and the second position restricting member presses the upper surface of the recording paper
- FIG. 4D is a schematic diagram showing a positional relationship when both the first and second position regulating members press the lower surface of the recording paper.
- FIG. 6 is a sectional view showing a first position regulating member and a second position regulating member provided in the plotter according to the second embodiment of the present invention.
- FIG. 7 is an enlarged cross-sectional view showing the vicinity of the first position regulating member and the second position regulating member of FIG.
- FIG. 8 is a perspective view showing a path from insertion of the recording paper to ejection of the recording paper by cutting out the plotter of the third embodiment of the present invention.
- FIG. 9 is a perspective view of the carriage of the plotter of FIG. 8 cut away.
- FIG. 10 is a perspective view showing a shape of a portion facing the recording paper in the recording medium floating prevention member of FIG. BEST MODE FOR CARRYING OUT THE INVENTION
- the plotter 10 of the first embodiment shown in FIG. 1 is fixed to the upper part of a stand 12 with casters 12a.
- the plotter 10 is provided with an operation unit 14 for operating the blotter 10.
- an operation unit 14 for operating the blotter 10.
- the recording paper inserted into the recording paper insertion slot 16 from the direction of arrow A is conveyed to the inside of the plotter 10 based on an instruction from the operation unit 14, where an image is printed and discharged.
- the plotter 10 has a cover 18 for recovering the inside.
- the recording paper transport path will be described with reference to F i.
- the plotter 10 can selectively print on both the recording paper inserted from the recording paper insertion slot 16 and the recording paper (roll paper 20) wound in a roll.
- the transport path of the recording paper inserted from the recording paper insertion port 16 will be described.
- the recording paper for example, large-size cut paper
- the inserted recording paper passes between the cover 22 and the upper guide 24 and is attached to the paper transport rollers 28 a. 28 b attached to the lower transport roller support plate 26 and the upper transport roller support plate 30.
- the paper transport roller 28c and the drive roller 32 While being pinched between the paper transport roller 28c and the drive roller 32 (the paper transport roller 28c and the drive roller 32 are an example of a first transport member according to the present invention), the paper transport roller 28c and the drive roller 32 pass through the first position regulating member 34. It reaches above the printing plate 36 (an example of an image forming area according to the present invention).
- the recording paper that has passed through the second position regulating member 38 formed on the downstream side in the recording paper conveyance direction of the printing plate 36 is then discharged by the discharge roller 40 and the spur 4 2 (the discharge roller 40 and the spur 42 This is an example of the second transport member according to the present invention) and is discharged.
- the portion located above the printing plate 36 has flatness due to the restriction by the first position restriction member 34 and the second position restriction member 38, as described later. Will be maintained.
- the plotter 10 includes gears 44, 45, 46, 47, and a motor 48 for rotating the drive roller 32, the discharge roller 40, and the like.
- FIG. 3 With reference to FIG. 3, a printing process for printing on recording paper will be described.
- the same components as those in FIG. 2 are denoted by the same reference numerals.
- the printing section reciprocates in the direction of arrow B (an example of the predetermined direction according to the present invention). It has a moving carriage 50.
- the carriage 50 is equipped with a head holder 52, and each head ink 52 (cyan, magenta, yellow, and black inks, respectively, is stored in the head holder 52).
- Print head 54 has been installed.
- a plurality of ink discharge ports (not shown) for discharging ink are formed on the ink discharge surface 56 (see FIG. 4) of the print head 54.
- the carriage 50 is fixed to a belt 58 hung on a drive source (not shown).
- the belt 58 reciprocates in the direction of arrow B by forward and reverse rotation of the drive source.
- the carriage 50 is also guided by the guide rail 60 and reciprocates in the direction of arrow B.
- the recording paper is intermittently conveyed in a direction perpendicular to the arrow B direction (recording paper conveyance direction).
- the recording paper is temporarily stopped and the carriage 50 is reciprocated in the direction of arrow B, and the ink discharge surface 56 (FIG. 4) of the recording paper is used.
- the ink is discharged from the ink discharge port to a portion located in the image forming area formed in front of the print head 54 based on the image information input to the print head 54.
- the recording paper is conveyed by a predetermined length, and an image for the next band is formed in a new portion located in the image forming area. This operation is repeated over the entire length of the recording paper.
- a blank image is formed on the recording paper.
- the recording paper on which the color image is formed is ejected along the ejection guide 62 while being held by the ejection port 40 and the spurs 42.
- FIG. 4 the same components as those of FIG. 2 and FIG. 3 are denoted by the same reference numerals.
- the first position restriction member 34 and the second position restriction member 38 (In the direction perpendicular to the recording paper transport direction).
- the first position regulating member 34 is formed of a thin line member, and is stretched in the direction of arrow B.
- one end 34a of the first position regulating member 34 is connected to the right side plate via a right side plate 66 fixed to the right side plate 64 so as to be movable in the recording paper conveyance direction. 6 Fixed to 4.
- the other end 3 4 b of the first position regulating member 3 4 is connected to the spring 72 through a notch of the left position plate 70 fixed to the left side plate 68 so as to be movable in the recording paper conveyance direction. Have been.
- the first position regulating member 34 is fixed in a state where a constant tension is applied.
- the linearity of the first position regulating member 34 is accurately secured.
- the amount of the extension can be absorbed by the spring 72.
- the right position plate 66 and the left position plate 66 are so arranged that the first position restricting member 34 is parallel to the guide rail 60 (see F ⁇ g. 3). Adjust by moving the position plate 70.
- the second position regulating member 38 is formed on the downstream side of the printing plate 36 in the recording paper conveyance direction and extends in the direction of arrow B, and is parallel to the guide rail 60 and the first position S regulating member 34. It has become.
- the guide rail 60, the first position regulating member 34, and the second position regulating member 38 are sandwiched between the drive roller 32 and the paper transport roller 28c.
- the transported recording paper is pressed by the lower part of the first position regulating member 34 to regulate the position, and is also pressed by the upper part of the second position regulating member 38 to regulate the position.
- the space between the portion (upper surface) 74 a of the recording paper 74 located in the image forming area and the ink discharge surface 56 is a K-shaped head 54.
- the image is kept constant irrespective of the moving position of the camera, and a high-quality image can be obtained.
- the recording paper 74 is pressed from the direction of the arrow C so that the recording paper 74 is pressed by the paper transport rollers 28a, 28b, 28c and wound around the drive roller 32. Conveyed.
- the recording paper 74 that has passed through the paper transport rollers 28 c is transported while being pressed from above by the first position regulating member 34.
- the recording paper 74 that has passed through the image forming area is printed by the print head 54 in the image forming area while the lower surface is pressed from below by the second position regulating member 38.
- the first position regulating member 34 a solid metal wire or a fine wire made of a wire is used. Further, in order to reduce the sliding noise caused by the sliding with the recording paper, a wire coated with a resin such as nylon or Teflon may be used. Since the second position regulating member 38 requires linearity, it is made of a molded member, sheet metal, or the like, but a metal round bar was good in the experiment.
- the recording paper 74 is sandwiched between the driving roller 32 and the paper transport rollers 28 a, 28 b, 28 c, the upper surface of which is pressed by the first position regulating member 34 and the second
- the sheet is conveyed while the lower surface thereof is pressed by the position regulating member 38, further conveyed while being nipped between the discharge roller 40 and the spur 42, and discharged in the direction of arrow D. Therefore, of the recording paper 74 being conveyed, the portion 74 a located in the image forming area in front of the ink discharge surface 56 (above the printing plate 36) is the first position regulating member 34 and the first position regulating member 34. It is pulled by the 2 position regulating member 38.
- the recording paper 74 has almost no irregularities. Since it is not formed, cockling can be suppressed. Further, of the recording paper 74 being conveyed, the portion 74a located in the image forming area is pulled by the first position regulating member 34 and the second position regulating member 38 and becomes a flat surface. Even when using large-size recording paper, the distance between the recording paper surface located in the image forming area and the ink discharge surface 56 can be maintained at a predetermined distance. It can print well.
- the first g regulating member 34 since a thin wire-shaped member is used as the first g regulating member 34 here, there is no need to consider eccentricity unlike the case where a roller is used. This not only simplifies the design but also requires less space for installation.
- the fine wire member since the fine wire member is pulled using the side plate of the S body, the linearity of the fine wire member can be easily secured, and even when printing on large-size recording paper, the flatness of the recording paper can be maintained. Can be secured.
- the mounting position does not fluctuate due to impact such as dropping or vibration, so that the thin wire member can be held with high accuracy.
- the first position restricting member 34 is made of a thin line member, it does not take up space, so that the first position restricting member 34 can approach the print head 54. Thereby, the distance between the first position regulating member 34 and the second position regulating member 38 can be shortened, and the recording paper located in the image forming area can be made a highly accurate flat surface, so that a good image can be obtained.
- the positions of the first position regulating member 34 and the second position regulating member 38 up and down according to the thickness of the recording paper 74 by £ 5, the thickness of the recording paper 74 changes. A good image can also be obtained.
- Position relationship between first and second position regulating members 34 and 38 and recording paper 7 5 has four positional relationships 31 as shown in FIGS. 5 (a) to (d).
- FIG. 5 (d) shows the position when both the first and second position regulating members 34, 38 press the lower surface 74 b of the recording paper 74.
- FIGS. 5 (b) and (d) are not appropriate because the second position restricting member 38 does not contact the upper surface 74a of the recording paper 74 after image formation. I can say.
- the second position regulating member 38 is required. Adjust by moving up and down.
- F i g. 5 (d) when adjusting the position of the first or second position regulating members 34 and 38 according to the thickness of the recording paper 74, the first and second position regulating members 34 and 38 are required. 38 Adjust by moving both up and down.
- the second embodiment of the present invention will be described with reference to FIGS.
- the appearance of the plotter of the second embodiment is the same as that of the plotter shown in FIG. 1, and many of the components are also the same. Therefore, among the components shown in FIGS. 6 and 7, the same components as those shown in FIGS. 1 to 5 are denoted by the same reference numerals.
- the plotter of the second embodiment is characterized in that the horizontal securing member 80 is fixed to the printing plate 36, and the second position regulating member 82 is fixed on the horizontal securing member 80. 6 and FIG. 7 have the same configuration as the first position regulating member 34 shown in FIGS. 2 and 4. Here, the description is omitted.
- a horizontal securing member 80 is detachably fixed to the downstream side of the printing plate 36 in the recording paper transport direction.
- the horizontal securing member 80 adjusts the position of the second position regulating member 82 so that the portion of the recording paper 74 located in the image forming area and the ink discharge surface 56 are kept parallel.
- the second position regulating member 82 is detachably fixed to the downstream portion of the printing plate 36 in the recording paper conveyance direction via the horizontal securing member 80.
- the second position restricting member 82 has a cross-section “a U-shaped thin line of a DJ” extending in the direction of arrow B (the direction perpendicular to the plane of FIG. 6 and FIG. 7; see FIG. 2). And is in contact with the horizontal securing member 80 on a flat surface.
- the portion of the second position regulating member 82 that presses the recording paper 74 is a curved surface 82a, so that smooth conveyance of the recording paper 74 and the linearity of the second position regulating member 82 can be ensured.
- the second position restricting member 82 is also required to have linearity similarly to the first position restricting member 34, and thus is made of a molded member ⁇ sheet metal, etc. Was good.
- the guide rail 60 (see FIG. 3) and the first position regulating member 34 are used.
- the recording paper conveyed while being nipped between the drive roller 32 and the paper carrying roller 28c is curved surface 34a of the first position regulating member 34.
- the position is restricted by being pressed by the curved surface 82 a of the second position restricting member 82, and the position is restricted. As a result, as shown in FIG.
- the interval between the portion 74a of the recording paper 74 located in the image forming area and the ink ejection surface 56 is constant regardless of the moving position of the print head 54. , So that good quality images can be obtained. Also, even when printing on large-format recording paper, the flatness of the recording paper can be ensured.
- the distance between the recording paper surface located in the image forming area and the print head 54 is preferably 1 to 2 mm, and the distance between the recording paper and the printing plate 36 is preferably at least 2 to 5 mm.
- the plotter according to the third embodiment of the present invention will be described with reference to FIGS. 8 to 10.
- the appearance of the plotter of the third embodiment is the same as that of the plotter shown in FIG. 1, and many of the components are the same. Therefore, among the components shown in FIGS. 8 to 10 that are the same as those shown in FIGS. 1 to 5, the same reference numerals are used. Is attached.
- the blotter 100 can print on sheet-shaped recording paper (cut paper) inserted from the recording paper insertion slot 16 and on recording paper (rolled paper) 20 wound in a roll.
- sheet-shaped recording paper cut paper
- recording paper rolled paper
- a large-sized cut paper is arranged and inserted into the recording paper insertion slot 16 from the direction of arrow A.
- the inserted cut paper passes between the paper cover 22 and the upper guide 24, and the paper transport rollers 28a and the upper roller rotatably fixed to the lower transport roller support plate 26.
- Above the printing plate 36 (being an example of an image forming area according to the present invention) while being sandwiched between the driving roller 32 and both of the paper conveying rollers 28 c rotatably fixed to the conveying roller support plate 30. , Fig. 9).
- the cut paper that has passed above the printing plate 36 is thereafter discharged while being sandwiched between the discharge roller 40 and the spur 42 located above the discharge roller 40.
- the spurs 42 are fixed to the spur plate 43 so that they can be tipped freely.
- the plotter 100 includes a carriage 50 that reciprocates in the direction of arrow B.
- the carriage 50 has a head holder 52, which holds four types of color inks (for example, cyan, magenta, yellow, and black).
- One print head 54 is installed.
- the carriage 50 is fixed to a belt 58 hung on a drive motor (not shown), and the belt 58 reciprocates in the direction of arrow B by forward and reverse rotation of the drive motor.
- the belt 58 moves back and forth in the direction of arrow B
- the carriage 50 is also guided by the guide rail 60 and reciprocates in the direction of arrow B.
- the cut paper is intermittently conveyed in a direction perpendicular to the direction of arrow B (an example of the recording paper conveyance direction in the present invention).
- the cut sheet In forming an image on the cut sheet, the cut sheet is temporarily stopped, and the carriage 50 is reciprocated in the direction of arrow B, and the print head is printed based on the input image information. Ink is ejected from the card 54 to form an image of one band on a portion of the cut sheet located in the image forming area 37. Thereafter, the cut paper is conveyed by a predetermined length, and an image for the next band is formed in a portion newly located in the image forming area 37. This operation is repeated over the entire length of the cut sheet. As a result, a color image is formed on the cut sheet. The cut sheet on which the color image is formed is discharged along the discharge guide 62 while being sandwiched between the discharge roller 40 and the spur 42.
- the carriage 50 includes a head holder 52 for detachably holding the four print heads 54, and a bearing 102 for reciprocating the carriage 50 in the direction of arrow B, a slider. 104 and an electrical unit 106 for controlling the print head 54 based on image information.
- the bearing 102 has a horseshoe shape and is installed below the electrical component 106.
- the guide rail 60 is fitted into the bearing 102, and the carriage 50 is guided by the guide rail 60. Also, the slider 104 is in contact with the subrail 108 (omitted in FIG. 8).
- the linear rail 110 (not shown) mounted on the lower part of the carriage 50 reads the scale of the linear scale 110 while reading the guide rail 60 and the sub rail 1. You will be guided to 08.
- the electrical component 106 is installed at a position close to the print head 54 to make it less susceptible to the effects of noise, and has various electronic components 112 mounted thereon.
- a recording medium floating prevention member is provided for each print head 54. 1 1 4 are arranged.
- the recording medium floating prevention member 114 is fixed to the carriage 50, and is closer to the recording paper 74 than the print head 54. In addition, a gap is provided between the recording medium floating prevention member 114 and the recording paper 74.
- the recording medium floating prevention member 114 is made of polyoxymethylene or a resin containing fluorine, and is a strong paddy and has a low coefficient of friction with respect to recording paper. For this reason, as will be described later, even if the convex portion of the recording paper 74 comes into contact with the recording medium floating prevention member 114, no frictional force that hinders image formation and conveyance of the recording paper 74 is generated. .
- the cockling described above occurs and the recording paper 74 becomes uneven.
- the degree of the unevenness varies depending on the paper quality of the recording paper 74 and the printing duty (the amount of ink per unit area).
- the degree of unevenness is severe, the convex portion that has grown to the image forming area 37 is pressed by the recording medium floating prevention member 114, so that the convex portion does not contact the print head 54.
- paper dust can be prevented from adhering to the defective ink discharge port of the print head, and the ink can be discharged normally, so that the image quality can be improved.
- an end 114a in the direction of the arrow B (longitudinal direction) is rounded and smooth.
- recording medium floating Of the upper prevention member 114 the end 114b in the direction of arrow C (recording paper conveyance direction) is also rounded and smooth.
- the portion of the recording medium floating prevention member 114 facing the recording paper 74 is formed smoothly. For this reason, even if the end of the recording paper 74 in the width direction floats in a curl shape, when the carriage 50 reciprocates in the direction of arrow B, the recording is performed on the raised portion of the recording paper 74. The medium floating prevention member 114 does not get caught and the recording paper 74 does not break.
- the recording medium floating prevention member 114 is formed for each print head 54. However, one recording medium floating prevention member extending in the direction of arrow B is aligned with the carriage 5 in a straight line. It may be formed as 0. In the above-described embodiment, the recording medium floating prevention member 114 is formed on the carriage 50. However, the recording medium floating prevention member may be formed on the print head 54. In this case, it is easy to form the recording medium floating prevention member at a position very close to the ink discharge port. Further, even if the arrangement of the plurality of print heads 54 is slightly shifted, the recording medium floating prevention member can be easily arranged in accordance with this arrangement. Industrial applicability
- the portion of the recording paper being conveyed, which is located in the image forming area, is pulled and the interval between this portion and the ink ejection surface is set to the predetermined interval. Therefore, even if the ink discharged from the ink discharge roller is absorbed by the recording paper and the fiber of the recording paper expands, no irregularities are formed on the recording paper, and cockling can be suppressed. Further, the recording paper surface located in the image forming area becomes flat by being pulled by the first position regulating member and the second position regulating member. The gap between the recording paper surface and the ink ejection surface can be kept constant, and good printing can be performed.
- both the first position regulating member and the second position regulating member extend in a predetermined direction in which the ink discharge surface reciprocates, the recording paper is pressed in the width direction of the recording paper.
- the recording paper can be pulled more accurately at any time, and cockling can be further suppressed.
- the first position regulating member and the second position regulating member is a thin wire stretched in a predetermined direction, no space is required, and the position regulating member is ejected by ink. Surface can be approached. With this, the distance between the first position regulating member and the second position regulating member can be shortened, so that the recording paper surface located in the image forming area can be made a plane with higher precision, and a better image can be obtained. In addition, since at least one of the first position regulating member and the second position regulating member is stretched in a predetermined direction, the linearity can be maintained even when the member is extended due to environmental temperature, heat, or the like. The recording paper surface can be made flat.
- the position where the first conveying member sandwiches the recording paper is higher than the first position regulating member, and Since the position where the member sandwiches the recording paper is lower than or the same height as the second position regulating member, it is easy to ensure the flatness of the recording paper surface located in the image forming area.
- the first position regulating member presses a surface facing the ink discharge surface of the both sides of the recording paper
- the second position restriction member functions as an ink discharge surface of the both sides of the recording paper. If the surface opposite the surface facing the surface is pressed, the second position regulating member does not contact the surface on which the image has been formed, so that image distortion due to the contact of the second position regulating member can be prevented.
- the position where the first and second conveying members sandwich the recording paper is the position where the first and second position regulating members are also lower. Therefore, the recording paper located in the image forming area It is easy to secure the flatness of the surface.
- both the first and second position regulating members press the surface of the recording paper opposite to the surface facing the ink discharge surface
- the first and second position regulating members are placed on the surface on which the image is formed. Since the two position regulating members do not contact, it is possible to prevent the image from being disturbed due to the contact of the second position regulating members.
- the thin wire can be close to the ink discharge surface, so that the flatness of the recording paper is reduced. When it is improved, high-quality images can be obtained.
- the fourth ink jet type image forming apparatus of the present invention a portion of the recording paper being transported, which is located in the image forming area, is pulled, and the interval between this portion and the ink ejection surface is set to a predetermined value. Since the intervals are maintained, even if the ink discharged from the ink discharge port is absorbed by the recording paper and the fibers of the recording paper expand, no irregularities are formed on the recording paper, and cockling can be suppressed. Also, the recording paper surface located in the image forming area becomes flat by being pulled by the first position regulating member and the second position regulating member. The distance between the recording paper surface and the ink discharge surface can be kept constant, and good printing can be performed.
- a horizontal securing member detachably fixed to the second position regulating member allows the second position regulating member to keep the portion of the recording paper located in the image forming area and the ink discharge surface parallel. The position can be adjusted. For this reason, if the thickness of the recording paper changes and it becomes impossible to keep the portion of the recording paper located in the image forming area parallel to the ink ejection surface, the second position regulation is performed by the horizontal securing member. By adjusting the positions of the members, the portion of the recording paper located in the image forming area can be kept parallel to the ink ejection surface.
- the first and second position regulating members have a curved surface for holding the recording paper. If it is, the recording paper can be transported smoothly.
- a convex portion is formed on the recording paper below the recording medium floating prevention member or upstream of this member in the recording paper conveyance direction. Also, since the convex portion is pressed by the recording medium floating prevention member, the convex portion does not contact the print head. As a result, it is possible to prevent paper dust from adhering to the damaged ink discharge port of the print head, and to discharge ink normally, thereby improving image quality.
- the recording medium floating prevention member is a member in which the portion facing the recording paper of the recording medium floating prevention member is formed smoothly, when the recording medium floating prevention member comes into contact with the recording paper, The recording paper will not be broken by being caught on the recording paper.
- the recording medium floating prevention member is made of polyoxymethylene or a resin containing fluorine
- the protrusion of the recording paper comes into contact with the recording medium floating prevention member because the coefficient of friction against the recording paper is low.
- the recording medium floating prevention member when the recording medium floating prevention member is formed on the print head, the recording medium floating prevention member can be easily formed at a position closer to the ink discharge port. Further, even if the arrangement of the plurality of print heads is slightly shifted, the recording medium floating prevention member can be easily arranged in accordance with the arrangement. Further, the recording medium floating prevention member is formed on the carriage. In the case where the printing medium is used, it is not necessary to form a recording medium floating prevention member for each print head, so that the cost can be reduced accordingly.
Landscapes
- Ink Jet (AREA)
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/101,415 US6161973A (en) | 1996-01-22 | 1997-01-21 | Ink-jet image forming device |
DE69723054T DE69723054T2 (de) | 1996-01-22 | 1997-01-21 | Tintenstrahllaufzeichnungsvorrichtung |
EP97900468A EP0876913B1 (en) | 1996-01-22 | 1997-01-21 | Ink-jet image forming device |
Applications Claiming Priority (8)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8/26255 | 1996-01-22 | ||
JP2625596A JPH09193374A (ja) | 1996-01-22 | 1996-01-22 | 画像形成装置 |
JP4571196A JP3319932B2 (ja) | 1996-03-04 | 1996-03-04 | インクジェット方式画像形成装置 |
JP8/45711 | 1996-03-04 | ||
JP4783496A JP3278344B2 (ja) | 1996-03-05 | 1996-03-05 | インクジェット方式画像形成装置 |
JP8/47834 | 1996-03-05 | ||
JP13905696A JP3365905B2 (ja) | 1996-05-31 | 1996-05-31 | インクジェット方式画像形成装置 |
JP8/139056 | 1996-05-31 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1997027055A1 true WO1997027055A1 (fr) | 1997-07-31 |
Family
ID=27458459
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP1997/000114 WO1997027055A1 (fr) | 1996-01-22 | 1997-01-21 | Dispositif de formation d'images a jet d'encre |
Country Status (4)
Country | Link |
---|---|
US (1) | US6161973A (ja) |
EP (2) | EP0876913B1 (ja) |
DE (1) | DE69723054T2 (ja) |
WO (1) | WO1997027055A1 (ja) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7971989B2 (en) * | 2005-12-07 | 2011-07-05 | Seiko Epson Corporation | Printer used with rolled sheet |
US8052272B2 (en) * | 2009-02-22 | 2011-11-08 | Hewlett-Packard Development Company, L.P. | Fluid-ejection device having rollers |
US8358323B2 (en) * | 2009-08-17 | 2013-01-22 | Xerox Corporation | Write heating architecture for dual mode imaging systems |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6021276A (ja) * | 1983-07-15 | 1985-02-02 | Ricoh Co Ltd | インクジエツト記録装置 |
JPS61280967A (ja) * | 1985-06-07 | 1986-12-11 | Canon Inc | インクジエツト記録装置 |
JPH04219244A (ja) * | 1990-09-18 | 1992-08-10 | Canon Inc | インクジェットプリンタ |
JPH04366639A (ja) * | 1991-06-13 | 1992-12-18 | Seiko Epson Corp | インクジェットプリンタの印字機構 |
JPH079713A (ja) * | 1993-06-03 | 1995-01-13 | Hewlett Packard Co <Hp> | プリンタ |
JPH0717036A (ja) * | 1993-07-01 | 1995-01-20 | Canon Inc | インクジェット記録装置 |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58179673A (ja) * | 1982-03-12 | 1983-10-20 | Hitachi Ltd | 用紙案内機構 |
JPS60214983A (ja) * | 1984-02-29 | 1985-10-28 | Toshiba Corp | 画像形成装置 |
US5065169A (en) * | 1988-03-21 | 1991-11-12 | Hewlett-Packard Company | Device to assure paper flatness and pen-to-paper spacing during printing |
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 |
EP0423820B1 (en) * | 1989-10-19 | 1996-01-31 | Seiko Epson Corporation | Ink jet printer |
CA2049747C (en) * | 1990-08-24 | 1996-12-17 | Yasuo Miyauchi | Recording apparatus |
US5455604A (en) * | 1991-04-29 | 1995-10-03 | Tektronix, Inc. | Ink jet printer architecture and method |
JP2959259B2 (ja) * | 1991-05-27 | 1999-10-06 | セイコーエプソン株式会社 | 印字装置 |
JPH0761078A (ja) * | 1993-08-25 | 1995-03-07 | Canon Inc | インクジェットプリンタ |
GB2290753B (en) * | 1994-02-10 | 1996-09-04 | Seiko Epson Corp | Ink jet printer |
-
1997
- 1997-01-21 EP EP97900468A patent/EP0876913B1/en not_active Expired - Lifetime
- 1997-01-21 US US09/101,415 patent/US6161973A/en not_active Expired - Fee Related
- 1997-01-21 WO PCT/JP1997/000114 patent/WO1997027055A1/ja active IP Right Grant
- 1997-01-21 EP EP02006740A patent/EP1221378A3/en not_active Withdrawn
- 1997-01-21 DE DE69723054T patent/DE69723054T2/de not_active Expired - Lifetime
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6021276A (ja) * | 1983-07-15 | 1985-02-02 | Ricoh Co Ltd | インクジエツト記録装置 |
JPS61280967A (ja) * | 1985-06-07 | 1986-12-11 | Canon Inc | インクジエツト記録装置 |
JPH04219244A (ja) * | 1990-09-18 | 1992-08-10 | Canon Inc | インクジェットプリンタ |
JPH04366639A (ja) * | 1991-06-13 | 1992-12-18 | Seiko Epson Corp | インクジェットプリンタの印字機構 |
JPH079713A (ja) * | 1993-06-03 | 1995-01-13 | Hewlett Packard Co <Hp> | プリンタ |
JPH0717036A (ja) * | 1993-07-01 | 1995-01-20 | Canon Inc | インクジェット記録装置 |
Non-Patent Citations (1)
Title |
---|
See also references of EP0876913A4 * |
Also Published As
Publication number | Publication date |
---|---|
EP1221378A2 (en) | 2002-07-10 |
EP0876913B1 (en) | 2003-06-25 |
DE69723054T2 (de) | 2003-12-24 |
DE69723054D1 (de) | 2003-07-31 |
EP0876913A4 (en) | 1999-03-17 |
EP0876913A1 (en) | 1998-11-11 |
US6161973A (en) | 2000-12-19 |
EP1221378A3 (en) | 2002-08-21 |
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