JPH0332856A - 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 a rotating displacement part between two hinges is rotated by the expansion and contraction of a displacement generation element, and a printing wire is driven through an arm mounted on the rotating displacement part. 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. The rotating displacement generation parts 4 longitudinally disposed are connected to each other by one end of an arm 5, which is provided with a printing wire 6 at the tip end thereof and extends in parallel to the expanding and contracting direction of the piezoelectric element 1. With a voltage application to the piezoelectric element 1, the frame 2 displaces in a direction of an arrow A and, thereby, the rotating displacement generation part 4 rotates in a direction B. A printing action is performed by the 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 printing pattern used in a dot matrix printer.

[Conventional technology]

In recent years, we have entered the era of office automation.

Kanji processing and graphic processing are rapidly progressing in the input/output equipment of information processing equipment, and printing equipment needs to be higher density, faster, and lower in price than ever before. . However, in most conventional print heads, electromagnets are used as a driving means for printing wires.

[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 differ depending on the number of driven wires, and there are restrictions on use such as the heat generation of the coil, which makes high-speed printing difficult. However, there were disadvantages in that printing quality was problematic. 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, there are displacement generating elements such as piezo elements as driving means, but since the generated displacement is minute, it is difficult to use it.
However, 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, both ends of the displacement generating element are in contact with opposing frames of the framework, and the displacement generating element is in contact with the opposing frame of the framework. The two frames that are not in contact have hinges at two places, and the rotational displacement part sandwiched between these two hinges rotates by the expansion and contraction of the displacement generating element, and is attached to the rotational displacement part. The printer has a mechanism for driving the printing wire through the attached arm.

〔Example〕

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

FIG. 1 is a perspective view of the print head driving means according to the present invention, and FIGS. 2 and 3 are side and rear views of FIG. Both ends of the element 10 are joined to the frame 2 and the pace 3. The enclosed rotational displacement generating section 4 is connected to the frame 2 and pace 3 by hinges 4a and 4b shifted by the interval shown in FIG. 2 to form a rectangular 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 by 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 the side view of the print head according to the present invention, in which a plurality of drive means shown in FIG. The grooves 4a' and 4b' forming the hinges 4a and 4b are formed concentrically around the entire circumference.

With the above configuration, when voltage is applied to the piezo element 1, the frame 2 is displaced in the direction of the arrow shown in FIG. The printing operation is performed by the printing wheel 6 via the printing wheel 6. 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 the power consumption is low and there is no interference between the driving means in the housing, it is possible to provide high-speed printing with good printing quality. Another effect of the housing is that there are no collision parts or friction parts inside the head, so 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, 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...vinyl/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 the displacement generating element is located inside the frame of the frame body. Each of the two frames that are not in contact with each other has two hinges, and the rotational displacement part sandwiched between these two hinges rotates by the expansion and contraction of the displacement generating element, and is attached to the rotational displacement part. A print head characterized by driving a print wire through an arm.