JPH0234782B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an ink-on-demand type ink jet print head that ejects ink only when necessary.

[Prior Art] Conventional ink-on-demand type inkjet print heads use a piezoelectric element in the diaphragm as a method of applying the necessary pressure to the ink, or a piezoelectric element is used in the diaphragm 2 as shown in FIG. By pasting the element 4 and applying electricity when necessary, the necessary pressure was obtained and ink droplets were blown away.

[Problems to be Solved by the Invention] However, in the above-mentioned conventional technology, since the piezoelectric element also serves as a diaphragm or the piezoelectric element is attached to the diaphragm, vibrations are generated that are fixed around the periphery. Problems include the inability to obtain a large amount of element displacement, poor responsiveness, and slow recording speed, and the inability to obtain sufficient displacement, resulting in insufficient ink volume and poor recording quality. The situation was ripe. The present invention is intended to solve these problems, and its purpose is to provide an ink-on-demand type inkjet print head that has good responsiveness and is capable of high-speed, high-quality inkjet recording. be.

[Means for Solving the Problems] The inkjet print head of the present invention includes a head main body, an ink chamber that is composed of the head main body and a wall member and communicates with a nozzle, and a vibrator that vibrates the wall member of the ink chamber. In the ink-on-demand type inkjet print head, the ink-on-demand type inkjet print head has vibration generating means for causing ink to be ejected from the nozzles, the vibration generating means being fixedly supported on the head main body connected to the wall member of the ink chamber. and a pressurizing part that extends from the fixed support part toward the wall member of the ink chamber, swings about the fixed support part as a fulcrum, and presses the wall member of the ink chamber. It is characterized by

[Function] According to the above configuration of the present invention, the vibration generating means is cantilever-supported by the fixed support part, and when a voltage is applied, the pressurizing part swings about the fixed support part as a fulcrum, thereby causing the wall member of the ink chamber to vibrate. Press. At this time, the displacement of the vibration generating means is large and efficient due to the one-sided support, which improves the ink jetting response, which increases the recording speed and jets a sufficient amount of ink droplets without blurring. High quality records can be obtained.

[Example] An example of the present invention will be described using FIGS. 2a and 2b. FIG. 2a is a cross-sectional view of the inkjet printhead of the present invention. In the figure, 1 is a nozzle, and 3 is a pressure chamber 2 communicating with the nozzle 1.
A diaphragm 5 constitutes a part of the pressure chamber and forms a wall of the pressure chamber; 5 is a head body which constitutes the pressure chamber together with the diaphragm 2;
6 is an ink tank. Reference numeral 4 denotes a piezoelectric element, which together with a printer fixing device 9 on which the piezoelectric element is placed constitutes vibration generating means for causing vibration of the diaphragm 2. A part of this vibration generating means is fixedly supported by a fixing screw 10 at a connecting portion of the head body 5 that is connected to the diaphragm 2. The side of the vibration generating means extending in the direction of the diaphragm 2 from this fixed support part is a pressure member 8.
are connected to form a pressurizing section.

In the above configuration, when a voltage is applied to the drive terminals 7a and 7b when ink ejection is necessary, the piezoelectric element 4
It sways. As is clear from the figure, the vibration generating means is cantilevered by the fixed support part, and the pressurizing part swings with the fixed support part as a fulcrum, vibrating the diaphragm 2 and applying the necessary pressure to the pressure chamber 3. Generate nozzle 1
eject more ink droplets. At this time, the pressurizing part to which the pressurizing member 8 is connected becomes a free end, and the amount of displacement of the vibration generating means can be larger than that of a peripheral fixed type in which the piezoelectric element is attached to the diaphragm, making it more efficient. This improves the ink jetting response, making it possible to increase the recording speed, and since sufficient displacement is obtained, a sufficient amount of ink droplets are jetted, enabling high-quality inkjet recording without blurring etc. becomes. Furthermore, since it is not necessary to increase the size of the piezoelectric element 4 in order to improve responsiveness, the head can be made smaller. Furthermore, since the responsiveness is improved, there is no need to use multiple devices to solve the problem of low recording speed, and the manufacturing of the head becomes easier.

In order to deal with nozzle clogging, ink replacement, etc., it is possible to separate the pressure generating mechanism 11 and the head main body component 12-1 as shown in FIG. 2B. That is, when the nozzle is clogged or when ink is replaced, the pressure generating mechanism 11 is fixed to the printer body by the printer fixing device 9 and the fixing screw 10 is loosened to remove the head body component 1.
Only 2-1 can be replaced, and the pressure generating mechanism 11 can be used again. When used again, the fixing screw 10 is tightened as shown in FIG. 2a to fix the head main body component 12-1 and the pressure generating mechanism 11, so that the vibration generating means is cantilevered as described above. do.

[Effects of the Invention] As described above, according to the present invention, the vibration generating means includes a fixed support part that is fixedly supported on the head main body connected to the wall member of the ink chamber, and a fixed support part that is connected to the ink chamber wall member. extending in the direction of the wall member of;
By having a pressurizing part that swings about the fixed support part as a fulcrum and presses the wall member of the ink chamber, the vibration generating means can be supported on a cantilever, and the vibration generating means can be attached to the wall member of the ink chamber. The amount of displacement of the vibration generating means can be increased compared to the peripheral fixed type, which improves ink jetting response, makes it possible to increase recording speed, and provides sufficient displacement. Therefore, a sufficient amount of ink droplets are ejected, and high-quality inkjet recording without blurring or the like is possible. Furthermore, since there is no need to increase the size of the vibration generating means in order to improve responsiveness, the head can be made smaller. Furthermore, since the responsiveness is improved, there is no need to use multiple devices to solve the problem of low recording speed, and this has the effect of making the head easier to manufacture.

[Brief explanation of drawings]

FIG. 1 is a sectional view of an ink-on-demand type inkjet print head using a conventional piezoelectric element. FIG. 2a is a sectional view of an ink jet print head according to an embodiment of the present invention. FIG. 2b is a sectional view showing the embodiment shown in FIG. 2a when the head main body components are replaced. 1... Nozzle, 2... Vibration plate, 3... Pressure chamber,
4... Piezoelectric element, 5... Head main body, 6... Ink tank, 7a, 7b... Drive terminal, 8... Pressure member, 9... Printer fixing device, 10... Fixing screw, 11... Pressure Generation mechanism, 12-1... head main body component.

Claims (1)

[Scope of Claims] 1. A head main body, an ink chamber configured of the head main body and a wall member and communicating with a nozzle, and a vibration generating means for vibrating the wall member of the ink chamber to cause ink to be ejected from the nozzle. In the ink-on-demand type inkjet print head, the vibration generating means includes a fixed support part fixedly supported on the head main body connected to the wall member of the ink chamber, and a fixed support part connected to the wall member of the ink chamber. an inkjet print head, the inkjet print head comprising: a pressurizing part extending in the direction of the wall member of the ink chamber, swinging about the fixed support part as a fulcrum, and pressing the wall member of the ink chamber.