JPS59214657A - Ink jet printer - Google Patents

Abstract

PURPOSE:To permit the use of stainless steel connecting needles without intrusion of small pieces generated from connecting needles into the connecting needles by providing a filter at the tip of the connecting needle of an ink jet printer. CONSTITUTION:A perforated filter 21 made of a ceramic or glass material having good hydrophilicity is pressed into the tip of a connecting needle 20 or with the aid of an adhesive. The many through holes of the filter 21 are preferably formed in parallel with through holes in the connecting needle 20. The connecting needle is inserted into the elastic seal portion of an ink container to enable ink to be supplied for the ink jet printer. The perforated filter preferably should have large numbers of through holes of tens-hundreds mum in diameter or side length.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to an inkjet printer with an improved ink supply system.

(Prior art) Conventionally, an electromechanical pressure transducer such as a piezo element is used as a pressurizing means, and a pressure capsule is used as an ignition nozzle to eject ink according to a recording control signal to perform dot recording. Controlled inkjet printers are known.

This type of inkjet printer has drawbacks such as the inability to control the deflection of ejected ink droplets, low ejection frequency and low ink ejection speed, and the inability to maintain a large distance between the nozzles and the recording paper.

However, unlike other methods, there is no need for high voltage, no pressure pump, no need to collect ink, and the structure is overwhelmingly simple and compact, making it suitable for small and inexpensive printers. ing.

An example of the structure of this type of printer is shown in FIG.

In FIG. 1, ■ is a recording head that discharges ink to perform ink recording, 2 is recording paper on which ink recording is performed, 3 is a carriage that moves the recording head back and forth,
4 is a sub-ink tank that supplies ink to the recording head;
A supply pipe 5 supplies ink from the sub-ink tank 4 to the recording head.

6 indicates a filter that cuts out dust, particles, pressure, etc.

A recording head 1 and a sub-ink tank 4 for supplying ink to the recording head 1 are integrally provided on the carriage 3.

This sub-ink tank 4 is connected to a main ink tank 8 by an ink supply tube 7 that moves back and forth. Pressure fluctuations caused by the inertia of the ink in the ink supply tube 7 caused by the reciprocating movement of the carriage 3 are absorbed by the air layer 9 in the sub-ink tank 4 and the filter 6. 10 is a communication pipe for maintaining the inside of the sub-ink tank 4 at atmospheric pressure. 11 is a magnetic yoke of the linear motor that also serves as a sliding shaft, 12 is a magnetic yoke that also serves as a frame,
13 is a permanent magnet. Here, the carriage 3 reciprocates from side to side on the magnetic yoke 1 by Fleming force acting between it and a coil (not shown).

In this type of inkjet printer, the replenishment of ink from the main ink tank 8 to the nozzle 1 is performed by continuous ink surface tension, capillary action, or the phenomenon of ink in the sub ink tank 4 due to ink jetting. This is automatically performed by reducing the pressure of the air layer 9 inside.

FIG. 2 shows the structure of the main tank 8. This diagram is shown in Sho 56-44663, and the ink for inkjet blinking is specially manufactured, and it is required to keep the ink's viscosity, surface tension, pH, etc. constant. .

Therefore, as the main tank 8, a thin metal I+ of 4 pieces as shown in Figure 2 is used! 14, flexible polymer film IS,
A flat bag with a sandwich-like structure is used in the lS. Here, the tube 17 is an outlet for leading ink to the outside from the main ink tank 8, and the tip of the tube 17 is an elastic weight-resistant cap made of rubber. At 18, the sealing cap 18 is inserted into the coupling needle 20 at the tip of the sealing tube 7 to supply ink to the nozzle l. In such a device, the case 19 is replaced each time the main ink tank 8 runs out of ink, but at this time, the sealing cap 18 is inevitably scraped by the coupling needle 20, which tends to generate small pieces of rubber. . If these small pieces of rubber enter the joint side, there is a drawback that the flow of ink is obstructed.

(Objective) An object of the present invention is to effectively prevent obstruction of ink distribution due to ink container replacement.

(Example) FIG. 3 shows the tip of a coupling needle 20 used in an example of the present invention, and the other structure is completely the same as that in FIG. 1. As shown in the figure, a filter 21 is attached to the tip of the binding needle 20 by press fit or adhesive. This filter 2
1 is made of hydrophilic ceramic or glass and is shaped like a lotus root. A large number of communication holes 22 of the filter 21 are provided parallel to the communication holes in the coupling needle 20, and the diameter or maximum side length of the communication holes 22 is approximately 10 meters to several loos as shown in Figure 4. m is set.

This value is preferably determined depending on the material of the sealing cap 18 and the size of the filter 21.

By arranging the filter 21 at the tip of the binding needle 20 in this way, small pieces generated due to the binding amount 1 are not allowed to enter the binding needle, and the stainless steel binding needle with excellent tearing properties can be used with confidence. I can do it.

(Effects) As described above, according to the present invention, there is no concern that the ink distribution will be hindered due to replacement of the ink container.

[Brief explanation of drawings]

Fig. 1 is a sectional view of an inkjet printer to which the present invention is applied, Fig. 2 is a sectional view of a main ink tank, and Fig. 3 is a sectional view of a main ink tank.
The figure is a cross-sectional view of the tip of a coupling needle according to an embodiment of the present invention, and FIG. 4 is a diagram of the example of FIG. 3 viewed from the direction ■. 8-111 Main ink tank 18---1 Elastic month stop cap 20---1 Binding Liu Applicant Canon Co., Ltd.

Claims (2)

[Claims] (1) An inkjet printer in which a binding weight is inserted into the elastic sealing portion of an ink container to supply ink NfU, characterized in that a filter is disposed within the binding weight 1. An inkjet printer. (2) The diameter or side length of the filter is several lOpm~
Claim 1, characterized in that it is a lotus root-shaped filter having a large number of communicating holes of several I Q Op, m.
The inkjet printer mentioned in section.