JPS62294554A - Secure supporting structure for ink jet head - Google Patents

Abstract

PURPOSE:To eject an ink drip stably by arranging a vibration-proof means around the outer wall of a tank section in an ink jet heated thereby limiting and absorbing vibration of the outer wall. CONSTITUTION:Vibration-proof rubbers 9 are placed respectively between an ink jet head 1 and a cover 3 and between the ink jet head 1 and a sub-tank 2 so as to hold the outer wall of a tank section 8. Consequently the vibration- proof rubbers 9 limit and absorb the vibration of the outer wall at the tank section 8 of the ink jet head 1, especially the vibration in the laminating direction of a vibration-proof plate 18, a nozzle plate 19, a tank plate 20 and a base plate 21. Other vibration-proof means may be arranged in place of the vibration-proof rubber 9.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention [Field of Industrial Application] The present invention relates to an on-demand ink jet printer, and particularly to a support structure for fixing an ink jet head onto a carrier.

[Prior Art] In recent years, with the spread of office automation, there has been an increasing demand for creating and printing documents in offices, and there has been a demand for printers with low noise and good printing quality.

Conventionally, this type of inkjet printer has a nozzle section, an ink pressurizing chamber, an ink supply section, etc. formed on the surface of a glass tube or plate using techniques such as photoetching, and a piezo vibrating unit bonded to the outer wall of the ink pressurizing chamber. A device has been proposed in which the ink pressurizing chamber is pressurized by the bending movement of the child, and ink droplets are ejected from the tip of the nozzle portion.

In a conventional inkjet printer, ink is supplied from a main tank to an inkjet head mounted on the carrier via a subtank mounted on the carrier. The inkjet head and the sub-tank are connected to the ink supply port of the sub-tank using a screw and nut via an O-ring to avoid ink leakage at the connection between the ink supply port of the sub-tank and the inkjet head. The ink supply port of the head is pressed and fixed. Further, screws and nuts 11 fix a resin cover around the inkjet head so as not to restrict the bending movement of the piezo vibrator. This controls the overall vibration of the inkjet head by suppressing the outer edge of the inkjet head.
It also functions to suppress noise generated by the bending motion of the piezo vibrator.

[Thinning point to be solved by the invention] In the conventional fixed support structure of the inkjet head described above, only the periphery of the screw hole and the outer edge are securely fixed.
The central part of the inkjet head, which is formed into a thin plate shape, is free. Therefore, the center of the inkjet head tends to resonate with vibrations caused by carrier movement, etc.
Particularly, the ink in the tank portion having the largest capacity causes subtle pressure fluctuations due to the vibrations. Particularly, vibrations around IKHz cause significant resonance.

Since pressure fluctuations occurring in the pressure chamber are structurally easily transmitted to the nozzle, the connection between the tank and the pressure chamber and the nozzle are made very thin. Despite this, pressure fluctuations occurring in the tank are easily transmitted to the nozzle, causing phenomena such as ink dripping on the nozzle end face and the meniscus receding, drawing air into the nozzle and pressure chamber. However, there is a drawback that causes inability to eject ink droplets.

In addition, in the case of an inkjet head equipped with multiple nozzles, pressure fluctuations in a certain nozzle part and the pressure chamber connected to it are transmitted to the tank part, vibrating the outer wall of the tank part, and as a result, affecting other nozzle parts. This has the disadvantage of causing a problem and hindering the stable jetting of ink droplets.

[Means for Solving the Problems] In order to solve the above-mentioned conventional problems, the present invention provides an inkjet head fixed support structure for fixedly supporting an inkjet head of an on-demand inkjet printer to a carrier. The present invention provides a fixed support structure for an inkjet head, characterized in that a vibration isolating means is arranged around the outer wall of a tank section in the head to regulate and absorb vibrations of the outer wall.

[Example] Next, the present invention will be specifically described with reference to the accompanying drawings.

FIG. 1 is a longitudinal sectional view taken along the line A-A showing an example of a fixed support structure for an inkjet head according to the present invention. FIG. 2 is a BB cross-sectional view of the same. FIG. 3 is a side view showing the state in which the inkjet head and the sub-tank or cover are fixed and held. FIG. 4 is a partial sectional view of the inkjet head.

FIG. 5 is an exploded perspective view schematically showing the inkjet head.

The structure and operation of the inkjet head fixed support structure of the present invention will be explained.

Reference numeral 1 denotes an inkjet head which is fixed with screws 10 and nuts 11 so that its ink supply port 5 is connected to the ink supply lower of the sub-tank 2 for the purpose of supplying ink onto a carrier (not shown). 3 is a cover for the purpose of fixing the outer edge of the inkjet head 1 and suppressing the noise caused by the vibration of the piezo vibrator 14;
It is attached to the inkjet head 1 with screws 10 and nuts 11 so as to wrap around the inkjet head 1.

As shown in FIG. 5, the inkjet head 1 includes a vibration plate 18, a nozzle plate 19, and a tank plate 20.
, a base plate 21, and a tank section 8, a pressure chamber 12, and a nozzle section 13 are included. Furthermore, a piezo vibrator 14 is bonded to the outer wall of the vibrating plate 18, and by applying an appropriate voltage and bending and deforming the vibrating plate 18, a piezoelectric vibrator 14 is connected to the vibrating plate 18 through the nozzle portion 13, which does not cause pressure fluctuations in the pressure chamber 12. to eject ink droplets.

Reference numeral 9 denotes a vibration-proofing rubber which clamps the outer wall of the tank section 8 in order to control unnecessary vibrations of the inkjet head 1, especially unnecessary vibrations of the vibration plate 18 and base plate 21 functioning as the outer wall of the tank section 8. The inkjet head 1 is inserted between the cover 3 and the sub-tank 2, respectively. At this time, the vibration isolating rubber 9 is attached to the inkjet head 1, cover 3, and sub tank 2.
It is desirable that it be installed without any gaps between the

Therefore, the vibration isolating rubber 9 appropriately regulates and absorbs vibrations of the outer wall of the tank portion 8 of the inkjet head 1, especially vibrations in the stacking direction of the vibration isolating plate 18, nozzle plate 19, tank plate 20, and base plate 21. There is.

Note that other vibration isolating means may be arranged instead of the vibration isolating rubber 9.

[Effects of the Invention] As described above, the present invention provides an inkjet head fixed support structure for fixedly supporting an inkjet head of an on-demand inkjet printer to a carrier, in which a vibration isolating means is provided around the outer wall of a tank portion in the inkjet head. In the inkjet head, the vibration of the outer wall, the interior of which serves as a tank for multiple nozzles, is regulated and absorbed by vibration-proof rubber. (1) The vibration of the carrier It has the effect of alleviating the effects on the tank section in the inkjet head due to movement or vibration and stabilizing the ejection of ink droplets, and (2) even in the case of an inkjet head having multiple nozzle sections. This has the effect of reducing pressure fluctuations occurring in the nozzle section and the pressure chamber from being transmitted to the tank section and, as a result, to other nozzle sections.

[Brief explanation of the drawing]

1 is a vertical sectional view taken along the line AA in FIG. 3 showing an embodiment of the fixed support structure for an inkjet head of an inkjet printer according to the present invention, FIG. 2 is a cross sectional view taken along the line BB in FIG. FIG. 4 is a partial sectional view of the inkjet head, and FIG. 5 is an exploded view schematically showing the inkjet head. l: Inkjet head 2: Sub tank 3: Cover 4: Ink chamber 5: Ink supply port 6: 0 ring
7: Ink supply port 8: Tank part 9: Vibration isolating rubber 10: Screw 11: Nut 12: Pressure chamber 13 Nozzle part 14: Viezo vibrator 15: Ink supply lobe 16 Screw hole 17: Nozzle end face 18: Vibration plate 19: Nozzle plate 20: Tank plate 21: Base plate

Claims (1)

[Claims] In an inkjet head fixed support structure for fixedly supporting an inkjet head of an on-demand inkjet printer to a carrier, a vibration isolating means is arranged around an outer wall of a tank section in the inkjet head to regulate and absorb vibrations of the outer wall. A fixed support structure for an inkjet head, which is characterized by: