JPH04126253A - Ink jet printer - Google Patents

Abstract

PURPOSE:To prevent recording paper from being stained with ink stuck to a press roller by a method wherein ink stuck to the press roller when the outer peripheral portions of the projection rows of the press roller are brought into contact with undried ink at printed places is absorbed into and cleanly wiped off by the outer periphery of each cleaning roller. CONSTITUTION:At the left end part of an arm 5 are provided a press roller 4, two cleaning rollers 6, a shaft 6a supporting these cleaning rollers, and one leaf spring 7. The respective cleaning rollers 6 are opposed to projection rows 4a of the press roller 4 to be disposed in such a way that the outer peripheral surfaces of the cleaning rollers are brought into contact with those of the projection rows, and are rotatable around the shaft 6a. The leaf spring 7, whose right end portion is inserted into the recessed part of the arm 5, urges the shaft 6a downward at an intermediate portion between the cleaning rollers 6 so that the outer peripheral surfaces of the cleaning rollers 6 are pressed against those of the projection rows 4a to be brought into contact therewith. The cleaning rollers 6 are made of superextra fine fibers having the absorption of ink and wiping and cleaning properties to ink. Owing to this arrangement, ink stuck to the outer peripheral top ends of the projection rows 4a of the press roller 4 is absorbed into and wiped off by the cleaning rollers 6 and, therefore, even in the case where the press roller is brought into contact with subsequent recording paper by rotation, this arrangement completely removes the possibility of staining the recording paper with ink.

Description

[Detailed description of the invention] [Industrial application field]

This invention provides a recording paper ejection roller that is installed at a location slightly apart in the recording medium feeding direction from the running position of the recording head, and that is in pressure contact with the ejection roller and has a spur gear-shaped protrusion row on the outer periphery. A printer that pinches and discharges printed recording paper at a location where it comes into pressure contact with a pressing roller so that the surface on the printing side contacts the outer periphery of a row of protrusions,
In particular, the present invention relates to an inkjet printer that eliminates the drawback that when undried ink from a printing area adheres to the presser roller side when the recording paper is ejected, the adhered ink contaminates the recording paper.

[Conventional technology]

Regarding the conventional example, in particular, the supply of a recording medium, such as a cut sheet or an envelope (hereinafter referred to as paper) to a printing location, and the discharge to a storage location after printing will be explained with reference to the drawings. FIG. 4 is a side view of the conventional example. In the figure, paper 9
Regarding manual feeding, there are a manual feed plate 13 for facilitating manual feeding, and guide plates 14 and 15 for guiding movement to a printing location. Regarding automatic feeding, a receiving plate 17 for initially storing a stack of paper, and a paper 9
There are a separation roller 18 and a separation claw 19 for separating the sheets one by one, and a guide plate 16 for guiding movement to the printing location. The printing area includes a drive roller 11, a pressing roller 12 that presses against the drive roller 11, a recording head 1, and a paper guide platen 2 that faces and approaches the drive roller 11. In addition, the recording head l is
It is mounted on a carriage 1a that travels perpendicular to the page. After printing, the sheets 9 are discharged by a discharge roller 3 and a pressure roller 4 opposing the discharge roller 3, and stored in a tray 8 in a stacked manner. Note that the pressing roller 4 is attached to the arm 2
It is rotatably supported at the left end of 5. This arm 25 is rotatably supported around a shaft 5a and biased counterclockwise by a spring 5b. The base 31 serves as a housing for storing the printer body.
, a case 32, and a cover 33.

[Problem to be solved by the invention]

The conventional techniques as described above have the following drawbacks. FIG. 5 is a perspective view of the main parts showing the drawbacks of the conventional example. In the same figure, 35 is solid black, and the printing density is 100% on paper 9.
Although this is not an extreme case when printing 0 characters, which is the printing part recorded in , this is assumed to be the case with figures. FIG. 6 relates to the operation related to the drawbacks of the conventional example, (a), (b
) and (C) are side views at each operation step. In FIG. 5, after printing, the paper 9 is ejected to the right by the ejection roller (see FIG. 4), which is located below and cannot be seen, and the presser roller 4. Two spur gear-shaped protrusion rows 4a are arranged on the presser roller 4, as shown in FIG.
As shown in a), the outer periphery of this row of protrusions 4a comes into contact with the surface of the paper 9. Due to contact with black solid 35, Fig. 6 (b)
As shown in the figure, a portion of the undried ink partially adheres to the outer periphery of the projection row 4a. This adhered ink is shown in Figure 6 (
When the presser roller 4 rotates and then comes into contact with the paper 9 as shown in FIG. 5, as shown in FIG.
It will remain as 7. In other words, the surface of the paper 9 is soiled and its quality is degraded. Incidentally, such a risk of quality deterioration is not limited to inkjet printers, but may similarly occur in printers or recording devices that generally use wet ink. However, in dot-type printers and pen-type recording devices, only characters and simple marks are printed or recorded, so the ink dries quickly and the above-mentioned problem does not actually occur. In fact, even in the inkjet method, when printing ordinary characters or simple marks, the amount of undried ink that adheres to the outer peripheral tip of the row of protrusions 4a of the presser roller 4 is small, so the presser roller 4 There is no risk that the paper 9 will dry by the time it rotates and next contacts the paper 9, staining the surface of the paper 9 and degrading its quality. Therefore, the drawback of staining the paper surface and reducing print quality is limited to printing using inkjet or printers, especially when there is a possibility of partially black solid printing due to special shapes etc. I can say that. The problem of this invention is to solve the problems of the conventional technology, and to solve the problem that when a large amount of undried ink from the printing area adheres to the presser roller side when the recording paper is ejected, this adhered ink contaminates the recording paper. Inkjet technology eliminates the drawbacks of
The purpose is to provide printers. [! ! la! [Means for Solving] In order to solve this problem, the inkjet printer according to claim 1 has the following features: An inkjet printer for this recording medium that is installed at a location slightly away from the running position of the recording head in the feeding direction of the recording medium. At the location of the press contact between the discharge roller and the press roller that is in press contact with the discharge roller and has a spur gear-shaped protrusion row on its outer periphery,
In a printer that pinches and discharges the printed recording medium so that its printing side surface contacts the outer periphery of the protrusion row, the protrusion row of the presser roller and the outer periphery are in pressure contact with each other and are rotatably supported. and a cleaning roller having absorbency and wiping ability for ink adhering to the outer periphery of the protrusion row. The inkjet printer according to claim 2 is the inkjet printer according to claim 1.
In the inkjet printer according to claim 3, the cleaning roller is made of a small amount of ultra-fine fibers (both the surface layer part of which is mechanically strong, dust-free, and chemical-resistant).
Alternatively, in the printer according to item 2, the cleaning roller is configured to be detachable.

[Function] In the inkjet printer according to claims 1 to 3, ink that adheres when the outer periphery of the protrusion row of the presser roller comes into contact with undried ink at the printing area is absorbed and wiped off by the outer periphery of the cleaning roller. Ru. In particular, in the inkjet printer according to claim 2,
At least the surface layer of the cleaning roller is mechanically strong, dust-free, and chemical-resistant. In particular, in the inkjet printer according to claim 3,
The cleaning roller is removable. Embodiments An embodiment of an inkjet printer according to the present invention will be described with reference to the drawings. FIG. 1 is a side view of the embodiment, and FIG. 2 relates to the main components of the embodiment, with (a) being a plan view thereof and (b) being a side view thereof. This embodiment differs from the conventional example in the configuration of the area around the presser roller relative to the discharge roller. In FIG. 1, a cleaning roller 6 is installed above the pressing roller 4 and in pressure contact therewith. Since the cleaning roller 6 and associated members not shown here are attached, the shape of the arm 5 is also slightly different from that of the conventional example. Since other members and configurations are the same as those in the conventional example, the same members are given the same reference numerals and their explanations will be omitted here. In FIG. 2, the left end of the arm 5 is provided with the same pressing roller 4 as the conventional one, two new cleaning rollers 6, a shaft 6a supporting them, and one leaf spring 7. That is, each cleaning roller 6 is arranged so as to face the protrusion row 4a so that their outer peripheries are in contact with each other, and is rotatable around the shaft 6a. The right end of the leaf spring 7 is inserted into the recess of the arm 5, and urges the shaft 6a downward between the cleaning rollers 6 to press the outer peripheries of the cleaning roller 6 and the protrusion row 4a into contact with each other. With this configuration, the cleaning roller 6 can be replaced very easily and quickly. The arm 5 is rotatably supported around an axis 5a, which is the same as in the conventional example. The cleaning roller 6 is made of ultrafine fiber that has ink absorption and wiping properties, such as Helima X manufactured by Kanebo Co., Ltd.
(registered trademark). It is also mechanically strong (and has excellent dust-free properties and chemical resistance).Therefore, the cleaning roller 6 itself can have a long lifespan, and its dust-free nature does not pollute the surrounding environment. Note that the entire cleaning roller 6 may be made of these fibers, or only the surface layer may be made of these fibers. This is done based on the level of printing quality. Therefore, for solid black, the protrusion row 4 of the presser roller 4 is
The ink adhering to the outer circumferential tip of the protrusion row 4a is absorbed and wiped off by the cleaning roller 6, and as a result, the outer circumferential tip of the protrusion row 4a becomes clean, and even if it comes into contact with the paper surface next time due to rotation, it will not become dirty. There is no fear at all. Note that the absorbency of this cleaning roller continues. The reason is that the ink penetrates into the spaces between the fibers and accumulates there, rather than into the fibers themselves. This means that the ink absorption rate is 1 in terms of its own weight.
This is supported by the fact that it is as high as 90%. FIG. 3 shows a printing pattern for confirming the effect of the embodiment. A strip-shaped black space 35 is printed at 100% print density across the entire width of the paper 9, and then a strip-shaped blank section 36 is provided.
Have them repeat this. It was examined whether this blank area 36 would be stained by ink adhesion caused by the black solid 35. Furthermore, this was repeated. The results were perfectly good. In addition, in the case of printing characters, etc., it has been proven that the cleaning port can be used for an extremely long period of time without being replaced.

【Effect of the invention】

Commonly in the inkjet printers according to the first to third aspects, ink that adheres when the outer periphery of the protrusion row of the presser roller comes into contact with undried ink at the printing area is absorbed and wiped off by the outer periphery of the cleaning roller. Therefore, when the outer periphery of the protrusion array next comes into contact with the surface of the recording medium, it will not be contaminated, and as a result, printing quality can be improved, and this can be achieved simply and at low cost. In particular, in the inkjet printer according to claim 2,
Since at least the surface layer of the cleaning roller is mechanically strong, dust-free, and chemical resistant, it is possible to extend the life of the cleaning roller, improve the reliability of the printer, and not pollute the surrounding environment. . In particular, in the inkjet printer according to claim 3,
Since the cleaning roller is removable from the presser roller, it can be replaced easily and quickly, resulting in excellent maintainability.

[Brief explanation of the drawing]

Fig. 1 is a side view of an embodiment according to the present invention, Fig. 2 relates to main members in the embodiment, (a) is a plan view thereof, and (b)
is a side view of the same, Fig. 3 is a printed pattern for confirming the effect of the embodiment, and Fig. 4 is a side view of the conventional example, Fig. 5 is a perspective view of the main part showing the drawbacks of the conventional example, and Fig. 6 The figures also relate to the operation, and (a), (b), and (C) are side views at each operation step. Symbol explanation 1: Recording head, 1a: Carriage, 2 Ni platen, 3: Ejection roller, 4: Holding roller, 4a: Projection row, 4b: Shaft, 5: Arm, 5a: Shaft 5b = Spring, 6: Cleaning roller, 6a: Axis, 7: Leaf spring, 9: Paper, 3
5: Black solid, 36: Blank area. Japanese talent O-U high school 2nd map black solid letters Usuri chart side a side da

Claims (1)

[Scope of Claims] 1) This recording medium ejection roller is installed at a location slightly apart in the recording medium feeding direction from the running position of the recording head, and a spur gear-shaped protrusion that is in pressure contact with this ejection roller. In a printer that pinches and discharges the printed recording medium at the location where it comes into pressure contact with the presser roller having a row of protrusions on its outer periphery so that the surface on the printing side contacts the outer periphery of the row of protrusions, the presser roller An inkjet printer comprising: a cleaning roller which is rotatably supported by a row of protrusions and an outer periphery thereof in pressure contact with each other, and has an ability to absorb and wipe ink adhering to the outer periphery of the row of protrusions. 2) The inkjet printer according to claim 1, wherein the cleaning roller is made of ultra-fine fibers that are mechanically strong, dust-free, and chemical-resistant at least in the surface layer. 3) The inkjet printer according to claim 1 or 2, wherein the cleaning roller is configured to be detachable.