JPS6297854A - Ink jet printer - Google Patents

Abstract

PURPOSE:To make uniform an air stream occurring between an ink mist adsorbing material and recording paper, by expanding the ink mist adsorbing material provided on the front surface of an ink jet head and by making this ink mist adsorbing material posses air-shielding and air-straightening functions. CONSTITUTION:An ink mist adsorbing material 10 is disposed beyond an area wherein jetted ink flies, on the front surface of a carriage 3, i.e. on the surface thereof opposite to a rotary drum 1, so that a gap between the drum and the ink mist adsorbing material is made uniform. The ink mist adsorbing material 10 has a hole 11 for flying of ink droplets, and it is formed in the shape of a curve (arc) 10a at an air stream inlet IN and an air stream outlet OUT. By making gentle (e.g. curved) the shape of the mist adsorbing material at the air stream inlet and the air stream outlet as stated above, the turbulence of the air stream is put down quickly at the inlet, and a turbulent flow generated when the air stream comes out of an air-straightening area does not affect the area wherein ink flies.

Description

Detailed Description of the Invention Advantages ■ The present invention is an inkjet printer, more specifically, an inkjet printer, more specifically, an inkjet head and a recording paper are moved relative to each other, and ink droplets ejected from the inkjet head are directed onto the recording paper. The present invention relates to the arrangement and structure of an ink mist adsorbent that reduces the influence of wind generated by movement of the inkjet head or recording paper on ejected ink droplets in an inkjet printer that performs printing.

In recent years, inkjet printers have increasingly adopted a method of printing by wrapping recording paper around a drum in order to achieve high printing quality. In this method of printing by wrapping recording paper around a drum, the drum is rotated at high speed in order to increase the printing speed. When this is done, the influence of airflow generated on the drum surface (printing surface) begins to occur, and several windshield devices and rectifiers have been developed to alleviate the influence of this airflow.

FIG. 4 is a configuration diagram of main parts for explaining an example of a conventional inkjet printer. In the figure, 1 is a rotating drum, 2 is a printing material (recording paper), 3 is a carriage, and 4 is the carriage 3. An inkjet head is mounted on the inkjet head, 5 is an ink droplet ejected from the inkjet head 4, and 6 is an air inlet rectifying plate.

Reference numeral 7 designates the air outlet windshield baffle plate, which, as is well known, rotates the rotary drum 1 in the direction of arrow A, and also rotates the carriage 3.
is moved in a direction perpendicular to the rotational direction of the rotating drum 1, that is, in a direction perpendicular to the paper surface, and during this time, ink droplets 5 are ejected from the inkjet head 4 onto the printing object 2 on the rotating drum 1. It is used for printing. In the conventional inkjet printer described above, ink droplets 5 ejected from the inkjet head 4 are transferred to the rotating drum 1.
When the ink droplet 5 is placed on the surface of the object 2 to be imprinted and printed, the ink droplet 5 is affected by the air flow B generated when the rotating drum 1 rotates, and the accuracy of the dot position of the inkjet is not stable. In order to rectify the air in the region where the inkjet flies to the object to be printed, a windshield plate or a rectifying plate 6.7 is provided outside or on the carriage. In addition, in conventional inkjet printers, a mist absorbing material is placed on the front of the carriage facing the object to be printed to absorb the ink mist that is generated when the inkjet hits the object to be printed. If no absorbent material is provided, this ink mist will adhere to the object to be printed, causing background smudges on the object to be printed.

Therefore, conventional ink-end printers require a large number of parts such as the windshield plate, rectifier plate, and ink mist adsorbent, which not only complicates the configuration but also causes high costs. It was also becoming.

The present invention was made in view of the above-mentioned circumstances.
In particular, the ink mist adsorbent provided on the front surface of the inkjet head is expanded, and the ink mist adsorbent has a windshield and rectifying function, thereby simplifying the configuration and reducing costs. It is.

(2) In order to achieve the above object, the present invention provides an inkjet printer that has a carriage equipped with an inkjet head and performs recording by relatively moving the carriage and recording paper. A floating ink mist adsorbent is provided on the surface facing the ink mist adsorbent, and the ink mist adsorbent is shaped so that the air generated between the ink mist adsorbent and the recording paper is uniform. It is. Hereinafter, the present invention will be explained based on examples.

FIG. 1 is a configuration diagram of main parts for explaining an embodiment of the present invention, in which l is a platen (rotating drum) 2 is a printing object, 3 is a carriage, and 10 is an ink mist according to the present invention. In the present invention, as shown in the figure, the ink mist absorbent 10 is disposed on the front surface of the carriage 2, that is, the surface facing the rotating drum 1, over the area where the ink jets fly, and the ink mist absorbent 10 is disposed on the front surface of the carriage 2, that is, on the surface facing the rotating drum 1, over the area where the ink jets fly. By keeping the gap with the mist adsorbent constant, the generated ink mist can be adsorbed while keeping the air flow in the ink flying area constant.

FIG. 2 is a diagram showing an example of a cross section taken along the line nn in FIG.
The air inlet portion IN and the air outlet portion OUT are formed into an R shape (arc shape) 10a, and the shape of the mist adsorbent at the air inlet and air outlet is shaped into a gentle shape (for example, an R shape). ), the turbulence in the airflow will quickly subside at the inlet (it will subside before the inkjet flight path), and the turbulence that occurs when the airflow exits the rectification area (the area surrounded by the mist adsorbent and drum) will be reduced. Does not affect the ink flying part.

In the illustrated case, the air inlet and air outlet of the ink mist adsorbent are R-shaped only in the rotational direction of the rotating drum, but as shown in FIG. When the carriage moves in the C direction, the front and rear ends of the carriage in the moving direction may also be formed into the same R shape as described above.

FIG. 3 is a perspective view showing another example of the ink mist adsorbent used in the implementation of the present invention. Each figure is an ink mist adsorbent for a color inkjet printer, and 11Y in the figure shows flying yellow ink droplets. IIM is a hole where magenta ink drops fly.

11C is a hole through which a cyan ink droplet flies, and IIK is a hole through which a black ink droplet flies. The present invention is not limited to the illustrated embodiment; in the case of monochrome, the number of holes may be one as shown in FIG. 2, or in the case of color, any number of holes other than the four mentioned above may be provided. good. In addition, FIG. 3(a) is an example in which a porous fiber material is used as the ink mist adsorbent 10, FIG. 3(b) is an example in which a porous sintered material is used, and FIG. 3(C) is an example in which a porous fibrous material is used as the ink mist adsorbent 10. Grooves 12 on the surface of the ink adsorbent
It will be readily understood that any ink adsorbent other than those shown may be used in the example in which the ink adsorbent is provided.

In addition, in recent years, high-speed printing has been required for serial-type (shuttle-type) inkjet printers other than drum-type inkjet printers, and the speed of the carriage has increased, so the influence of wind generated between the carriage and the printing object has increased. It has become impossible to ignore it. In particular, in the case of serial printers, since the deflection is performed using a charged deflection type inkjet, the deflection distortion is large (which has a large effect on printing quality).Moreover, multi-function serial printers are also used, and the inkjet from each head is However, it is effective to provide the above-mentioned function to the mist adsorbent of such a serial printer.

Next, as is clear from the above explanation, according to the present invention, the ink mist adsorbent has a windshield and rectifying function, so the number of parts is reduced and the configuration is simplified.
Cost reduction can be achieved.

[Brief explanation of drawings]

FIG. 1 is a perspective view of essential parts for explaining an embodiment of an inkjet printer according to the present invention, FIG. 2 is a cross-sectional view taken along line nn in FIG. 1, and FIG. FIG. 4, a perspective view showing an example of an adsorbent, is a configuration diagram of a main part of a conventional ink shared printer. 1... Rotating drum, 2... Recording paper 23... Carriage. 4... Inkjet head, 10... Ink mist adsorbent, 11. IIY, IIM, IIC, IIK...
- Ink droplet flying hole. 1st Kyouko 21 41 Fig. 3

Claims (5)

[Claims] (1) In an inkjet printer that has a carriage equipped with an inkjet head and performs recording by moving the carriage and recording paper relatively, a floating ink mist adsorbent is provided on the surface of the carriage facing the recording paper. 1. An inkjet printer, characterized in that the ink mist adsorbent is shaped so that the air generated between the ink mist adsorbent and the recording paper is uniform. (2) When the recording paper is wound around a rotating drum, the ink mist adsorbent is disposed on the front surface of the carriage so as to have a uniform gap between it and the rotating surface of the rotating drum. The inkjet printer according to claim 1, wherein the inkjet printer has an arcuate shape. (3) The ink mist adsorbent is configured such that during printing, the wind input section forms a laminar flow at the inkjet flight location. inkjet printer. (4) The ink jet printer according to claim (1), wherein the ink mist adsorbent is configured so that turbulence does not occur at the wind output section during printing. . (5) The ink mist adsorbent has an air inlet and an air outlet formed in an arc shape. inkjet printer.