JPH01306251A - Ink jet recording head - Google Patents

Abstract

PURPOSE:To simplify an inspection after manufacture by composing a cover covering a printing element of a molding transparent resin, and observing the states of a liquid passage, a liquid chamber of the element without removing the cover. CONSTITUTION:A cover molded of transparent resin is so attached as to cover a liquid chamber 6 and a liquid passage 5 of a printing element 1. Further, an elbow 7 of a supply passage for supplying ink to the chamber 6 is secured in pressure contact by the cover molded of the resin with the upper face of the chamber 6 of the element 1. When the ink is supplied from the elbow 7, the ink is introduced to the chamber 6, the passage 5, and an orifice 4. When a drive pulse signal is applied by a drive circuit, the ink is discharged from the orifice 4. When the ink is filled in a head of such a structure, the ink filling state to the passage 5 and the chamber 6 can be observed without removing the head cover, and hence manufacturing steps and a printing inspection after the manufacture can be simplified.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a recording head used in an inkjet recording apparatus.

[Prior Art] The inkjet recording method is a recording method in which ink is ejected from an orifice provided in a recording head and recorded by adhering it to a recording material such as paper. It has many advantages such as being able to record and use plain paper.

A conventional inkjet head is equipped with a cover as shown in FIG. 2 for the purpose of protecting the printing element and for the purpose of tightly fitting a suction cap used for preventing and recovering from defective ejection.

Usually, this cover is molded from a resin that is strong in mechanical strength and resistant to thermal deformation, and is attached to cover the entire printing element.

[Problems to be Solved by the Invention] However, with this cover attached, the entire printing element is covered, making it difficult to observe the internal state of the printing element's liquid path and the g liquid chamber that communicates with the liquid path. There was a problem in that the cover had to be removed each time the ink filling condition, presence of air bubbles in the liquid chamber, adhesion condition, etc. were checked during the manufacturing process and print inspection.

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide an inkjet recording head equipped with a cover that allows easy observation of the liquid path, liquid chamber, etc. of the printing element. .

[Means for Solving the Problems] The present invention provides a printing element having an orifice for discharging ink, a liquid path communicating with the orifice, a liquid chamber communicating with the liquid path, and supplying ink to the liquid chamber. The gist lies in an inkjet recording head having a supply path and a cover that covers the printing element, in which the cover is made of a transparent resin molded body.

[Function] According to the present invention, the conditions of the liquid path and liquid chamber of the printing element can be observed without removing the cover, so that the manufacturing process and post-manufacturing print inspection can be simplified. can.

[Embodiment] FIG. 1 shows one embodiment of the recording head of the present invention. In FIG. 1, a cover A2 made of transparent resin is attached to cover the liquid chamber 6 and liquid path 5 of the printing element 1. Further, on the upper surface of the liquid chamber 6 of the printing element 1, an elbow 7, which is a supply path for supplying ink to the liquid chamber 6, is fixed under pressure by a cover B3 made of transparent resin.

In the above configuration, when ink is supplied from the elbow 7,
Ink is guided to a liquid chamber 6, a liquid path 5, and an orifice 4, and when a drive pulse signal is applied by a drive circuit (not shown), the ink is ejected from the orifice 4.

When filling ink with a head having such a structure, the state of ink filling into the liquid path 5 and liquid chamber 6 can be observed without removing the head cover, and the liquid path during the ejection state can be observed. 5 and the liquid chamber 6, the state of bubbles, the state of the heater (not shown), etc. can also be observed.

As for the elbow 7, although it does not cause any major inconvenience even if it is made of an opaque member, it is better to use a transparent member.

In addition, the cover A2 and the cover B3 cover the liquid path 5 and the liquid chamber 6.
It is desirable to have a shape that does not prevent the observation of

[Effects of the Invention] As explained above, if the inkjet recording head of the present invention is used, the state of the liquid path and liquid chamber of the printing element can be observed without removing the cover attached to the printing element, making post-manufacturing inspections easier. It can be made simple.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an inkjet recording head of the present invention;
FIG. 2 is a perspective view of an inkjet recording head with a conventional structure. 1...Printing element, 2...Cover A, 3...
Cover B, 4... Orifice, 5... Liquid path, 6...
・Liquid chamber, 7...Elbow. Figure 1 Figure 2

Claims (1)

[Claims] A printing element having an orifice for discharging ink, a liquid path communicating with the orifice, a liquid chamber communicating with the liquid path, and a supply path supplying ink to the liquid chamber, 1. An inkjet recording head comprising a cover for covering the head, the cover being made of a transparent resin molded body.