JPS62204950A - Ink supply device - Google Patents

Abstract

PURPOSE:To provide an simple-structured ink supply device equipped with a filter and tube connection means which can prevent entrainment of a foreign matter without fail by utilizing the thermal contraction of a tube connected with a filter. CONSTITUTION:A tube is made of, for instance, olefinic polyethylene so that it may be thermally contractive. A filter 14 is in a columnar shape and made of a material obtained by baking resin beads. The diameter of a cross section of the filter 14 is smaller than the inside diameter of the tube 13 before contraction and larger than the inside diameter of the tube 13 after complete contraction. Accordingly the bonding method of the filter 14 and the tube 13 is such that the filter 14 is inserted into the tube 13, heat is applied to the tube 13 by hot air after the insertion and then the tube is caused to be thermally contracted. A gap is provided between the inside diameter of the tube 13 before contraction and the outside diameter of the filter 14. Therefore, when the filter 14 is inserted into the tube 13, there is no possibility that the edge of the filter 14 might be broken, thus improving working efficiency.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an ink supply device, and more particularly to a connection between a filter and a tube that supplies an infrastructure/through pipe.

[Conventional technology]

A conventional ink supply device will be explained using an inkjet printer.

Conventionally, ink supply devices for inkjet printers
A tube is connected to the nozzle for guiding ink from the ink reservoir to the nozzle.

Since nozzle holes are generally minute, if a foreign object larger than the nozzle hole gets into the nozzle, it will block the nozzle hole and cause ink to fail to be ejected. If it gets mixed into the nozzle, it is expected to have a serious adverse effect on the ink ejection characteristics. Therefore, a filter is provided at the other end of the tube to prevent foreign matter from entering the nozzle.

For example, Japanese Patent Application Laid-Open No. 59-33154 discloses that in order to prevent foreign matter from entering the nozzle, and to prevent flow path resistance from increasing even if some foreign matter adheres to the opening of the filter, The shape of the filter has been devised.

Further, in Japanese Patent Application Laid-Open No. 60-99660, a filter shape is devised to improve workability by joining the filter and the tube.

[Problem that the invention seeks to solve]

In the above-mentioned conventional equipment, the method of joining the filter and the tube is not sufficiently considered, and there is also damage to the filter during the joining process, and processing of the gap between the filter and the tube, which requires a large number of parts. There were issues such as sexual complexity.

The object of the present invention is to solve the above-mentioned problems.

It is an object of the present invention to provide an ink supply device f't- equipped with a means for joining a filter and a tube, which is simple and can reliably prevent contamination of foreign matter.

[Means for solving problems]

In order to achieve the above object, the tube that supplies ink to the nozzle pipe has a characteristic of shrinking when heat is applied, and the joint portion into which the filter is inserted is heat-shrinkable.

Achieved.

[Operation] After the filter is inserted into the tube, the joint part of the tube with the filter is heated with hot air or the like to shrink the inner diameter of the tube, and the outer periphery of the tube and filter are brought into close contact. .

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 4.

Fig. 3 is a schematic diagram of an inkjet printer, in which the nozzle head is fixed on the carrier base 2 with a fixture 3, and the carrier paste 2 is placed on the recording body 7 on the rail 4.5.
It is now possible to move left and right in directions A and B. The ink particles 6 ejected from the nozzle head 1 are
An image 8 is recorded on a recording body 7 that is transported in the direction.

Further, as another embodiment, a color printer can be obtained by providing a plurality of nozzle heads 1t and filling each nozzle with one ink, for example, cyan, magenta, yellow, or black.

FIG. 4 is a block diagram showing the structure of the nozzle head 1 in detail. The nozzle head 1 is formed with a nozzle 10 and an ink tank 20.9, and the nozzle 10 is formed with a nozzle pipe 11. A mechanical transducer element such as a piezoelectric element 12. Tube 13. In addition to the filter 14, a fine orifice 15 is formed at the tip of the nozzle pipe 11. The tube 13 is a heat-shrinkable tube, for example, a tube made of olefinic polyethylene.

The piezoelectric element 12 is fixed to the nozzle pipe 11, and the information signal 9 is applied through the conductive wire 161wL pole 17.

The ink tank 20 is filled with ink 21, and the filter 14. Ink 21 is supplied to the nozzle pipe 11 through a tube 13.

FIG. 1 shows an embodiment of the present invention, and is an enlarged configuration diagram showing a joint portion between a filter 14 and a tube 13. As shown in FIG. Filter 1
4 is made of a material made of sintered resin beads, for example, and has a cylindrical shape.

The cross-sectional diameter df of the filter 14 is smaller than the inner diameter at@ of the tube 13 before contraction, and larger than the inner diameter dtI of the tube 13 after complete contraction. Therefore, filter 1
4 and the tube 13, the filter 14 is inserted into the tube 13, and after insertion, heat is applied to the tube 13 with hot air or the like to heat-shrink the tube 13.

As described above, according to this embodiment, by applying hot air to the insertion portion of the filter 14 and tube 13, the filter 14 and tube 13 are brought into close contact with each other, making joining the filter 14 and tube 13 extremely easy. Become. Furthermore, since a heating temperature of, for example, a hot air temperature of 80 t:'-120 C is sufficient, and the injection time is short, the device for bonding can be simplified.

In addition, since there is a gap between the inner diameter dto of the tube 13 before contraction and the outer diameter df of the filter 14, the filter 1
When inserting into the 4T-tube 13, there is no fear of damage to the end of the filter 14, and work efficiency can be improved.

FIG. 2 is a configuration diagram showing another embodiment, in which the filter 14 is shaped so that the diameter at the center is smaller than the diameter at both ends, and after being inserted into the tube 13, the tube 13 is heat-shrinked. . This makes it difficult for the filter 14 to come off from the tube 13, and it is more securely fixed.

〔Effect of the invention〕

According to the present invention, the work of joining the tube and filter can be simplified, and damage to the filter can be prevented. Moreover, without using adhesives or filter holding members,
Since the filter and tube can be brought into close contact, the number of parts can be reduced and workability improved.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an enlarged filter portion of one embodiment of the present invention, FIG. 2 is a block diagram showing another embodiment of the present invention, and FIG. 3 is a schematic diagram of the structure of an inkjet printer. 4
The figure is a schematic diagram of the nozzle head configuration. l... Nozzle head, 2... Carrier base, 10
...Nozzle, 13...Tube, 14...Filter. Stem 1 Figure stem 2 Mouth 14 Fu 4 + Rec

Claims (1)

[Claims] 1. An ink supply device comprising an ink tank storing ink, a nozzle pipe, a tube for supplying the ink to the nozzle pipe, and a filter inserted and joined to the tip of the tube and immersed in the ink. An ink supply device characterized in that the tube joined to the filter is heat-shrinked.