JPH0332854A - Printing head - Google Patents

Abstract

PURPOSE:To obtain a printing head having a simple structure, the small number of component parts, good assembling properties, a small size, a light weight, and a low cost by a method wherein two rotating displacement generation parts longitudinally provided are rotated about the same shaft in the same direction and integrally fixed by an arm. CONSTITUTION:A laminated piezoelectric element 1 serving as a displacement generation means is bonded to a frame 2 and a base 3 at the both ends thereof. A rotating displacement generation part 4 is connected to the frame 2 and the base 3 with hinges 4a, 4b shifted with each other by a distance D and constructed into a rectangular frame. This is constructed longitudinally symmetrical. The rotating displacement generation parts 4 longitudinally disposed are rotated about the same shaft in the same direction. The base 3 connected to the rotating displacement generation part 4 is integrally formed over the full periphery thereof. with a voltage application to the piezoelectric element 1, the frame 2 displaces in a direction of an arrow A, the rotating displacement generation part 4 rotates in a direction B, and a printing action is performed by a printing wire 6 through a lever 5. At this time, the displacement of the piezoelectric element 1 is enlarged in a ratio of the distance D between the hinges 4a, 4b to a lever length L.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a print head for use in a dot matrix printer.

[Conventional technology]

In recent years, in the era of office automation, the input/output equipment of information processing equipment has rapidly become more and more kanji processing and graphic processing, and printing equipment has become more dense, faster, and cheaper than ever before. It's becoming necessary.

In conventional print heads, as a means of driving the print wire,
Most of them are basically composed of electromagnets.

[Problem to be solved by the invention]

When electromagnets are used, a common problem is that magnetic interference occurs between the individual drive means, the characteristics differ depending on the number of driven wires, and there are restrictions on use due to the heat generated by the coils, which makes high-speed printing difficult. It was difficult, and it had the disadvantage of causing problems with printing quality. Further, there are disadvantages in that miniaturization is not possible due to problems such as magnetic flux saturation and coil mounting, and wear and noise occur due to collisions of magnetic attraction parts. On the other hand, as a driving means, there are displacement generating elements such as piezo elements, but because the generated displacement is minute, it is difficult to use!
Until now, it had the disadvantage that it could not be used in print heads.

[Means to solve the problem]

The present invention has a displacement generating element inside a rectangular framework, and both ends of the displacement generating element are in contact with opposing frames of the framework, and! Of the frames of the framework body, the two frames that are not in contact with the displacement generating element have hinges at the two locations, and the rotational displacement portion sandwiched between these two hinges is as follows:
In a print head that rotates as the displacement generating element expands and contracts and drives a printing wire via an arm attached to the rotational displacement portion, the rotation axes and rotation directions of the two left and right rotational displacement generation portions are the same, It has a mechanism in which the two rotational displacement generating parts are integrally fixed to the arm.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

First, FIG. 1 is a perspective view of a print head driving means according to the present invention, and FIGS. 2 and 3 are a side view and a rear view of FIG. Both ends of the piezo element 1 are joined to a frame 2 and a base 3. Further, the rotational displacement generating section 4 is connected to the frame 2 and the base 3 by hinges 4a and 4b shifted by the interval shown in FIG. 2 to form a rectangular C framework. Here, this configuration is bilaterally symmetrical as shown in FIG. 3, and the rotational displacement generating parts 4 are arranged on the left and right sides, but the rotation axis and rotation direction are the same. Further, the left and right rotational displacement generating sections 4 are connected to one end of an arm 5 having a printing wire 6 at its tip and extending parallel to the direction of expansion and contraction of the piezo element.

On the other hand, FIGS. 4 and 5 are half-sectional views of a side view and a back view of a print head according to the present invention, in which a plurality of drive means shown in FIG. The base 3 connected to the base 3 has an integral structure over the entire circumference, and grooves 4a' and 4b' forming hinges 4a and 4b
are machined concentrically around the entire circumference.

With the above configuration, when a voltage is applied to the piezo element 1, the frame 2 is displaced in the direction of arrow A shown in FIG. Then, the printing wheel 6 performs the printing operation. Here, the displacement of the piezo element 1 is expanded by the ratio of the distance between the hinges 4a and 4b and the lever length. Therefore, according to the present invention, since power consumption is low and there is no interference between each drive means, a print head with high speed and good print quality can be provided. Another effect is that since there are no collision parts or friction parts inside the head, a highly reliable and low-noise print head can be provided.

〔Effect of the invention〕

According to the present invention, it is possible to provide a small, lightweight, and low-cost print head that has a simple structure, has a small number of parts, and is easy to assemble.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a driving means according to an embodiment of the present invention;
2 is a side view of the driving means shown in FIG. 1, FIG. 3 is a rear view of the driving means shown in FIG. 1, FIG. 4 is a side view showing an embodiment of the present invention, and FIG. 5 is a side view of the driving means shown in FIG. 4 is a partial cross-sectional view of the rear side of the embodiment shown in FIG. 4. FIG. 1... Piezo element, 2... Frame,
3... Pace, 4... Rotational displacement generating section, 5... Arm, 6... Printing wire.

Claims (1)

[Claims] In the dot matrix print head, a displacement generating element is provided inside a rectangular frame body, both ends of the displacement generating element are in contact with opposing frames of the frame body, and displacement generating elements of the frame of the frame body are respectively abutted. The two frames that are not in contact with the generating element each have two hinges, and the rotational displacement portion sandwiched between these two hinges rotates as the displacement generation element expands and contracts, and the rotational displacement portion is rotated by the expansion and contraction of the displacement generation element. In the print head that drives the print wire through the attached arm, two
A print head characterized in that the rotational axes and rotational directions of the rotational displacement generating sections at the two locations are the same, and the rotational displacement generating sections at the two locations are fixed integrally by an arm.