JPH0336046A - Printing head - Google Patents

Abstract

PURPOSE:To obtain a high speed good printing quality printing head since power consumption is little and there is no interference between respective drive means by a method wherein a displacement generating element is provided inside a rectangular frame work and a laminated piezoelement is used as the displacement generating element. CONSTITUTION:Both ends of a laminated piezoelement 1 being a displacement generating means are connected to a frame 2 and a base 3. Further, a rotary displacement generating part 4 is united with the frame 2 and the base 3 with hinges 4a and 4b which are shifted by an interval D to construct a rectangular framework. When voltage is impressed to a piezoelement 1, the frame 2 is displaced in the arrow A direction. The rotary displacement generating part 4 is rotated in the arrow B direction thereby, and printing operation is performed with a printing wire 6 via a lever 5. Herein, the piezoelement 1 is so constructed as to magnify its displacement by a ratio of a 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 printing field used in a dot matrix printer.

[Conventional technology]

In recent years, with the arrival of the 7th and 7th eras of office automation, the input/output equipment of information processing equipment has rapidly progressed toward kanji processing and graphic processing, and printing equipment has become more dense, faster, and faster than ever before. Lower prices are becoming necessary.

In conventional print heads, as a means of driving the print wire,
Most of them are based on electromagnets with *g.

[Problem to be solved by the invention]

When using electromagnets, a common problem is that magnetic interference occurs between the individual drive means, the characteristics vary depending on the number of driven wires, and there are restrictions on use due to the heat generated by the coil, which makes high-speed printing difficult. There was a drawback that problems occurred in b1 printing quality, which was difficult to achieve.

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 is a displacement generating element such as a piezo element, but this has the disadvantage that the generated displacement is so small that it cannot be used as is in a print head.

[Means to solve the problem]

The button of the present invention has a displacement generating element inside a rectangular frame body, and both ends of the displacement generating element are in contact with the button of the opposing frame IC of the frame body, and Of these, the two frames that are not in contact with the displacement generating element have hinges at two places of the button, and the rotational displacement part sandwiched between these two hinges rotates as the displacement generating element expands and contracts. , a printing unit 9 drives a printing wire via an arm attached to the rotational displacement portion, and a laminated piezo element is used as the displacement generating element.

[Effect]

The present invention drives a printing wire by enlarging minute displacements generated by a displacement generating element by a displacement amplifying mechanism.

〔Example〕

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

FIG. 1 is a perspective view of the driving means of the printing hect according to the present invention, and FIGS. 2 and 3 are views between the @ side view and the back side of FIG. Both ends of the piezo element 1 are joined to the frame 2 and the base 3. Further, the rotational displacement generating section 4 is connected to the frame 2 and the base 3 not only at the intervals shown in FIG. 2 but also by hinges 4a and 41) to form a rectangular framework. Here is the book 411IkM.

As shown in FIG. 3 VC, the rotational displacement generating portions 4 are arranged left and right, but their rotational axes and rotational directions are the same. In addition, one end of an arm 5 having a printing wire 6 at the tip and extending parallel to the elongation direction of the piezo element
The left and right rotational displacement generating sections 4 are coupled.

On the other hand, FIGS. 4 and 5 are half-cut box views of a side view and a back view of a print head according to the present invention, in which a plurality of driving means shown in FIG. 1 are arranged on the circumference, and a rotational displacement generating portion 1114a' and 4 form hinges 4a and 4b.
b' is machined concentrically over the entire circumference.

Due to the above 4111, when the piezo element IK voltage is applied, the 7th frame 2 is displaced in the direction of the arrow A shown in Figure WI2]2, thereby the rotational displacement generating section 4 rotates in the direction B,
A printing operation is performed by a printing wire 6 via a lever 5. Here, #14 is used to expand the displacement of the piezo element 1 depending on the ratio between the hinges 4a and 4b (Ml) 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 hept, a highly reliable and low-noise print head can be provided. Furthermore, [Effects of the Invention] According to the present invention, it is possible to provide a small, lightweight, and low-cost (1)-shaped head that has a simple structure, 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, FIG. 2 is a side view of the driving means shown in FIG. 1, and FIG. 3 is a rear view of the driving means shown in FIG. 1. Figure 4 is a side view showing one embodiment of the present invention, and Figure 5 is a partial cross-sectional view of the rear side of the embodiment shown in Fig. 4. l...Piezo element, 2...Frame,
3... Base, 4... Rotational displacement generating section, 5... Arm, 6... Printing wheel.

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 due to the expansion and contraction of the displacement generation element, and the rotational displacement portion is rotated by the expansion and contraction of the displacement generation element. A print head that drives a print wire via an attached arm, characterized in that a laminated piezo element is used as the displacement generating element.