JPS63246777A - Pressure fixing device - Google Patents

Abstract

PURPOSE:To permit easy discrimination of colors of respective picture elements and to improve image quality by providing a picture element forming means which forms the picture elements at required intervals provided between each other to a press roll for fixing to recording paper. CONSTITUTION:The picture element forming means 29a which forms the picture elements at the required intervals provided each other is provided on the press roll 29 for fixing which moves under rotation in the direction intersecting with the feed direction of the recording paper supported and fed by a supporting member 7 while the press roll is brought into pressurized contact with said recording paper by the required pressure corresponding to the pressing force of a pressing member 25. More specifically, a material to be fixed is pressure- fixed at the required slight intervals to the recording paper by the picture element forming means 29 provided on the press roll 29 for fixing when the press roll 29 moves in the direction intersecting with the feed direction while the press roll is brought into pressurized contact with the recording paper by the pressure corresponding to the pressing force of the pressing member 25. The respective picture elements consisting of the pressure-fixed material to be fixed are thereby discriminated and the high-quality image is obtd.

Description

[Detailed Description of the Invention] [Industrial Application Field 1] This invention is applicable to fixing developed toner on recording paper in B color and destroying microcapsules containing ink of a desired color. A pressure fixing device that fixes the ink and develops it.

[Prior Art] Conventionally, a pressure roll is brought into contact with a rotatably supported support roll at a predetermined pressure over almost the entire axial direction, and a recording sheet is placed between the support roll and the pressure roll. Generally, a pressure fixing device having an aperture is known, in which the toner as the fixing agent developed on the recording paper is fixed under pressure by passing the toner in the direction perpendicular to the axis. The type of pressure fixing device has the problem of increasing the size and cost of the device because the contact area of the pressure roll against the support roll is large, requiring a large amount of pressure device means. ing. In order to solve the above-mentioned drawbacks, the applicant moved the fixing press roll, which presses against the recording paper with a required pressure according to the elastic force of the elastic member, in a direction intersecting the feeding direction. We proposed the Tsuji Rikijo@device which fixes the fixing agent under pressure.

[Problems to be Solved by the Invention] 1 Generally, it is difficult for human vision to distinguish the colors of pixels smaller than about 300 μm, and therefore it is difficult to distinguish colors of pixels smaller than about 250 μm (4 pixels/am). It is known that pixels can sufficiently distinguish colors. In the pressure fixing device proposed by the present applicant, for example, a capsule sheet coated with photosensitive microcapsules each containing yellow, mabinta, and cyan ink is used, and is superimposed on the recording paper. When developing multicolors by destroying uncured microcapsules and fixing the encapsulated ink onto recording paper using a fixing press roll that presses against the capsule sheet, Since the uncured microcapsules were completely destroyed and the pixels were brought into close contact with each other, it was difficult to distinguish the color of each pixel. For this reason, the image quality was poor.

[Object of the Invention] The object of the present invention is to improve a pressure fixing device proposed by the applicant, and to form each pixel formed by a fixing agent that is pressure-fixed onto a recording sheet at minute intervals. An object of the present invention is to provide a pressure fixing device that can improve image quality.

[Means for Solving the Problems 1] For this reason, the present invention provides a means for pressing the recording paper supported on the support member and fed in the feeding direction with a required pressure according to the pressing force of the pressing member. A pressure fixing device is constructed by providing a fixing pressure roll that rotates and moves in a direction intersecting with the fixing pressure roll, and a pixel forming means for forming each pixel at a predetermined interval from each other.

[Operation of the Invention] Since the present invention is configured as described above, the fixing press roll moves in a direction intersecting the feeding direction while being pressed against the recording paper with a pressure corresponding to the pressing force of the press member. When doing,
A pixel forming means provided on the fixing pressure roll fixes the to-be-fixed material under pressure at a predetermined minute interval. This makes it possible to identify each pixel made up of the to-be-fixed agent, and it is possible to obtain a high-quality image.

[Example] Hereinafter, a capsule sheet on which photosensitive microcapsules in which yellow, mapinta, and cyan inks were respectively encapsulated using the present invention as a fixing agent was almost uniformly coated was used.
An embodiment of a pressure fixing device that performs multicolor development by destroying uncured microcapsules and fixing the encapsulated ink onto recording paper will be described with reference to the drawings.

FIG. 1 is a perspective view schematically showing a pressure fixing device according to the present invention, FIG. 2 is a sectional view taken along the line A-A in FIG. 1, and FIG. Frame 3 of fixing device 1
forms a support surface 7 that supports the recording paper 5 being fed. A color developer is applied almost uniformly to the upper surface of the recording paper 5, and is developed into a desired color by reaction with ink encapsulated in microcapsules, which will be described later. On the feeding side of the frame 3, a pair of upper and lower feeding rolls 9 having an axis in a direction perpendicular to the feeding direction of the recording M5,
Further, on the delivery side, a pair of upper and lower delivery rolls 11 having axes parallel to the delivery roll 9 are rotatably supported. A sheet roll 15 on which a capsule sheet 13 is wound is rotatably supported above the feeding side of the feeding roll 9, and a take-up roll 17 is rotatably supported on the feeding side of the feeding roll 11. The capsule sheet 13 drawn out from the roll 15 is transferred to the feeding roll 9 and the feeding O.
- It is stretched so as to be wound up on the winding roll 17 via the roll 11. In this capsule sheet 13, microcapsules (none of which are shown) each containing yellow, magenta, and cyan inks as a fixing agent are coated almost uniformly on a base paper. The microcapsules in which each color of ink is encapsulated are irradiated with ultraviolet rays or visible light of a required wavelength from an exposure device (not shown) installed between the feed roll 9 and the sheet roll 15. As a result, it is hardened so that it cannot be destroyed by pressure contact with a fixing press roll 29, which will be described later. Therefore, microcapsules that have not been irradiated with ultraviolet rays or visible rays from the exposure device are kept in an uncured state that can be destroyed by pressure contact with the fixing press roll 29.

As a result, a latent image of a shape corresponding to a desired color is formed on the capsule sheet 13 by the cured microcapsules and the uncured microcapsules.

A paper roll 18 on which the recording paper 5 is wound is rotatably supported below the feeding side of the feeding roll 9, and the recording paper 5 led out from the paper roll 18 is positioned on the lower surface of the capsule sheet 13. while being guided to pass through the feed roll 9, the support surface 7 and the feed roll 11.

A feeding motor (not shown) is connected to the feeding roll 9, feeding roll 11, and take-up roll 17, and the front dark feeding roll rotates the paper as the feeding motor is driven. 9. The recording paper 5 and capsule sheet 13 are transferred to the fixing press roll 2 by the feeding roll 11 and the take-up roll 17.
The rotation loci of No. 9 are fed in feeding stages where the rotation loci partially overlap each other.

A gate-shaped support frame 2 is provided at the center of both sides of the frame 3.
0, and the support frame 20 is provided with a rotating shaft 1 having an axis in the direction toward the support surface 7 and rotating around the axis.
9 is supported so as to be slidable in the axial direction. A large diameter portion 19a is integrally formed at the lower end of the rotating shaft 19,
A support ring 23 is attached via a bearing 21 to the rotating shaft 19 above the large diameter portion 19a. A compression spring 25 as a pressing member is installed on the rotation shaft 19 between the support ring 23 and the lower surface of the support frame 20, and the elastic force of the compression spring 25 urges the rotation shaft 19 downward on the axis. Ru. A recording paper 5 is attached to the lower end of the rotating shaft 19.
Two arm shafts 27 extending in the radial direction from the center of the rotary shaft 19 are fixed to each other so as to form a negative drawing line shape. A fixing press roll 29 is supported at the tip of each arm shaft 27 via a ball bearing 31 so as to be rotatable around the axis. This fixing press roll 29 is made of metal or ceramic material having wear resistance and hardness. The outer peripheral surface of the fixing press roll 29 has an average depth of 2 to 50 μm and an average diameter of 50 to 500 μm.
A large number of concave and convex portions 29a constituting the double thread forming means consisting of m
are integrally formed with almost uniform density at minute intervals. The fixing pressure roll 29 applies a required load (approximately 20 to 40 kg>
Pressure-welded. An electric motor 35 as a driving member is attached to the support frame 20, and the electric motor 35
The rotating shaft 19 is connected to the rotating shaft 35a by a coupling 36.
are connected to each other so as to be movable in the axial direction. Then, the rotating shaft 19 is rotated by the drive of the electric motor 35.
rotated in the direction

Next, the operation of the pressure fixing device 1 constructed as described above will be explained with reference to FIG.

In FIG. 3 showing the pressure fixing state, the fixing press roll 29 is connected to the rotating shaft 1 which rotates as the electric motor 35 drives.
Capsule sheet 1 superimposed on recording paper 5 by 9
3, it is rotated counterclockwise according to a rotation locus while being pressed against it with a required pressure according to the elastic force of the compression spring 25. In this state, the recording paper 5 led out from the paper roll 18 and the capsule sheet 13 on which a latent image corresponding to one page's worth of figures and colors has been formed by the exposure device are superimposed, and the feeding roll 9, As the feed roll 11 and the take-up roll 17 rotate, the fixing press roll 29 is supported on the support surface 7 and is fed to the feeding side of the rotational trajectory of the fixing press roll 29. The recording paper 5 is moved in an arc shape in a direction intersecting the feeding direction of the recording paper 5 while being pressed against the Cubhill sheet 13 stacked on top of each other at four points with pressure depending on the elastic force of the compression spring 25 . Then, the uncured microcapsules are destroyed by pressure contact with the fixing press roll 29, and the encapsulated ink is mixed and fixed on the recording paper 5, so that the color developer applied to the recording paper 5 is transferred to the ink 1. The latent image is developed in multiple colors by reacting with - to develop the desired color. At this time, since an uneven portion 29a of a required size is formed on the outer peripheral surface of the fixing press roll 29, uncured microcapsules corresponding to the convex portions of the uneven portion 29a are destroyed, and the concave portions are destroyed. Destruction of uncured microcapsules in response to this is avoided.

As a result, 2 to 20 pixels are formed on the recording paper 5 per #1 in a halftone pattern at minute intervals. Thereby, it is possible to identify the color of each pixel developed in multiple colors on the recording paper 5, and the image quality can be improved. Further, as the feed roll 9, the feed roll 11, and the take-up roll 17 rotate, the recording paper 5 and the capsule sheet 13 are arranged so that the rotation loci of the fixing press roll 29 partially overlap each other in the feeding direction. As a result, the amount of ink adhered to the recording paper 5 corresponding to the overlapping area is larger than that of other areas, and the boundary area becomes clearer. However, each pixel phase U is Since the image is developed in color, it is possible to blur the difference in sharpness between the overlapping area and other areas, and it is possible to prevent deterioration in image quality.

Then, as a result of the above operation, the recording paper 5 and capsule sheet 13, which have been subjected to multicolor development, are transferred to the feeding side of the rotational trajectory of the fixing press roll 29 as the feeding roll 9, delivery roll 11, and take-up roll 17 rotate. When the fixing press roll 29 is fed to the rotation trajectory sending side of the fixing press roll 29, the fixing press roll 29 again applies pressure according to the elastic force of the compression spring 25 to the capsule sheet 13 superimposed on the recording paper 5. The recording paper 5 and the capsule sheet 13 are moved in an arc shape in a direction intersecting the feeding direction of the recording paper 5 and the capsule sheet 13 while being pressed against each other. As a result, the microcapsules that were not completely destroyed on the rotational trajectory feeding side are almost completely crushed on the rotational trajectory feeding side, and the encapsulated ink is reliably mixed and fixed on the recording paper 5 for multicolor development. You can.

Then, the double fixing press roll 29 is pressed into contact with J:
When the recording paper 5 on which ink of each color has been mixed and fixed is fed to the delivery roll 11, the recording paper 5 is discharged to the outside of the pressure fixing device 1 as the delivery roll 11 rotates and is uncured. The capsule sheet 13 in which the microcapsules have been destroyed is wound up as the winding roll 17 rotates.

In this way, in this embodiment, the capsule sheet 13 superimposed on the recording paper 5 is pressed against the capsule sheet 13 by a pressure corresponding to the elastic force of the compression spring 25, and then moved in an arc shape in a direction intersecting the feeding direction. The uncured microcapsules are destroyed at minute intervals by the uneven portions 29a formed on the outer peripheral surface of the fixing press roll 29, and the encapsulated ink is fixed on the recording paper 5, allowing multicolor development. . As a result, each pixel developed in multiple colors is formed with a minute interval corresponding to the uneven portion 29a, so that the color of each pixel can be distinguished, and the image quality can be improved. Also, capsule sheet 1
3, the fixing roll 29 comes into pressure contact with the rotating locus so that a part of its rotation locus overlaps, so that the amount of ink adhering to the overlapping part and other parts is different, and the degree of development is different. Since minute intervals are formed between the pixel phases U, it is possible to blur the difference in the degree of development and obtain substantially uniform image quality.

The above explanation uses a capsule sheet coated with microcapsules containing yellow, magenta, and cyan ink, and destroys the uncured microcapsules and transfers the encapsulated ink to the recording paper 5. In this embodiment, a toner is used as the fixing agent and the toner developed on the recording sheet is fixed under pressure using a fixing pressure of 0-10 mm.

Further, in the above description, the pixel forming means is constituted by the uneven portion 29a formed on the outer peripheral surface of the fixing pressure roll 29.
The pixel forming means may be configured by integrally forming a large number of grooves intersecting with each other at required intervals on the outer circumferential surface of the fixing press roll 29.

[Effects of the Invention] Therefore, the present invention provides a pressure fixing device that can form each pixel formed by a fixing agent that is pressure-fixed on a recording paper at minute intervals, and that can improve image quality. It is possible to provide

[Brief explanation of the drawing]

FIG. 1 is a perspective view schematically showing a pressure fixing device according to the present invention, FIG. 2 is a sectional view taken along A-Afil in FIG. 1, FIG. 3 is a perspective view of a fixing pressure roll, and FIG. FIG. In the figure, 1 is a pressure fixing device, 5 is a recording paper, 25 is a compression spring as a pressing member, 29 is a fixing pressure roller, and 29a is an uneven portion as an image forming means.

Claims (1)

[Claims] (1) While rotating the fixing press roll in a direction intersecting the feeding direction, the fixing press roll presses against the recording paper being fed while being supported on the support member with the required pressure according to the pressing force of the press member. A pressure fixing device for moving and fixing a fixing material under pressure, characterized in that the pressure roll for fixing the recording paper is provided with pixel forming means for forming each pixel at a predetermined interval from each other. Device.