JPH0373357A - Displacement magnification mechanism - Google Patents

Abstract

PURPOSE:To reduce the spacing of first and second hinges even when the second hinge is not divided into two because the second hinge, the fixing section of a fixing member and a joining member do not collide, to diminish width and to improve the efficiency of mounting by notching a section superposed to the fixing section of the second-hinge fixing member of the joining member on the second hinge side while notching the first hinge side of the fixing section of the second-hinge fixing member. CONSTITUTION:One end of a first hinge 2 is fixed at one end section of an arm 1, and the other end is fastened at one end section of a piezoelectric element 4 through a joining member 5. A second hinge 3 is positioned in parallel and brought near to the first hinge 2, and one end of the second hinge 3 is fixed to the arm 1 and the other end is fastened to a fixing member 7 unified with a fixing member 6. A section superposed to the fixing sections of the second hinge 3 and the fixing member 7 of the joining member 5 is notched on the second hinge 3 side, and the first hinge 2 side of the fixing sections of the second hinge 3 and the fixing member 7 is notched. Accordingly, the spacing of the first and second hinges 2, 3 can be reduced even when the second hinge 3 is not divided into two as seen in conventional devices, and width is diminished, thus improving the efficiency of mounting.

Description

[Detailed Description of the Invention] [Summary] An object of the present invention is to provide a displacement enlarging mechanism suitable for increasing the speed of a print head, etc., with good mounting efficiency and displacement enlarging efficiency. a thin plate-shaped first hinge with one end fixed to the end of the first hinge, one end fixed to the other end of the first hinge via a joining member, and the other end fixed to the fixing member. A displacement magnification mechanism comprising a piezoelectric element and a thin plate-shaped second hinge parallel to and close to the first hinge, one end of which is fixed to the arm, and the other end of which is fixed to a fixed member, wherein the joint said second hinge of the member;

A portion of the fixing member that overlaps with the fixing portion is cut out on the second hinge side, and the second hinge.

The first hinge side of the fixing portion of the fixing member is cut out.

[Industrial application field]

The present invention relates to a displacement magnification mechanism suitable for increasing the speed of a print head.

In recent years, there has been a demand for faster printing speed in printing devices. To meet this demand, a print head using a piezoelectric element as a drive source is used, but in order to achieve even higher speeds, an efficient displacement magnification mechanism is required.

[Prior Art] FIG. 3 is a perspective view showing a conventional displacement magnification mechanism disclosed in Japanese Patent Application Laid-Open No. 61218369, in which 101 is an arm, 102, 103 . and 104 are the 1st and 2nd. and a third hinge, 105 is a piezoelectric element, and 106 is a fixing member. The first hinge 102 has one end at the base 101a of the arm 101? The other end is fixed to one end of the piezoelectric element 105 via a joining member 107. The piezoelectric element 105 is located on both sides 106a of the U-shaped fixing member 106,
106b, the bottom part 1 of the fixing member 106
The other end is fixed to 06c. Second. One end of the third hinge 103° 104 is fixed to the base 101a of the arm as shown in FIG. The ends are respectively fixed to the side portions 106b. In this state, the second. The third hinges 103 and 104 are on both sides of the first hinge 102 and are parallel to the first hinge 102.

The operation of the displacement magnification mechanism having such a configuration is as follows.

When the piezoelectric element 105 is charged by electricity, the piezoelectric element 1
Due to the displacement 05, the joining member 107 moves by a predetermined amount in the direction of arrow A in FIG. 3, and a compressive force acts on the first hinge 102. As a result, the arm 101 rotates in the direction of arrow B in FIG. 3 due to the bimetallic effect of each hinge 102, 103, 104. In this case, a sufficient expansion displacement is applied to the tip of the arm 101. When this displacement magnification mechanism is applied to a print head, the print head is constructed by fixing the print wire 108 to the tip of the arm 1, and when the arm 1010 rotates, printing is performed using the print wire 108. Then, when the power to the piezoelectric element 105 is stopped at a predetermined time (immediately before the completion of printing in the case of a print head), the piezoelectric element 105 starts discharging, and the arm 101 moves each Hinge 102°10
3. Return to the original position with 104.

In this case, the piezoelectric element 105 is quickly displaced and returned, so if this displacement magnification mechanism is applied to the print head, it is possible to increase the printing speed.

[Problems to be Solved by the Invention] By the way, in order to increase the displacement amplification efficiency of this displacement amplification mechanism, the first hinge 102 and the second hinge 102 are parallel to each other. Although it is necessary to reduce the distance between the third hinge 103 and 104, the distance between the second hinge 103. A fixing portion between the third hinge 103° 104 and both sides 106a and 106b of the fixing member, and a joining member 107
The two collide. Therefore, in the conventional displacement magnification mechanism described above, as shown in FIG.
and a second hinge on both sides of the first hinge 102 avoiding the piezoelectric element 105. There were third hinges 103 and 104, which increased the width and resulted in poor mounting efficiency.

An object of the present invention is to provide a displacement amplification mechanism with good mounting efficiency and displacement amplification efficiency.

[Means to solve the problem]

In order to achieve the above-mentioned object, the present invention includes an arm and a thin plate-shaped first member having one end fixed to one end of the arm.
a piezoelectric element having one end fixed to the other end of the first hinge via a joining member and the other end fixed to the fixing member, the piezoelectric element being parallel to and close to the first hinge; and a thin plate-like second hinge having one end fixed to the arm and the other end fixed to the fixing member, the second hinge of the joining member, the fixing part of the fixing member The overlapping portion is cut out on the second hinge side, and the second hinge and the fixing portion of the fixing member are cut out on the first hinge side.

[Effect]

The present invention is configured as described above, and since the second hinge and the fixing part of the fixing member and the joining member do not collide,
The first hinge does not need to be divided into two. The spacing between the second hinges can be reduced. Therefore, the width becomes smaller.1. Implementation efficiency will improve.

〔Example〕

The present invention will now be described in detail with reference to FIGS. 1 and 2.

Fig. 1 is a side view showing the displacement magnification mechanism of this example, and Fig. 2 is a perspective view showing the main parts of Fig. 1, in which 1 is an arm, 2 is a first hinge, and 3 is a second hinge. The hinge 4 is a piezoelectric element.

The first hinge 2 has one end (upper end) fixed to one end (right end) of the arm I, and the other end (lower end) to which the joining member 5 is fixed to one end (upper end) of the piezoelectric element 4. has been fixed. The other end (lower end) of the piezoelectric element 4 is fixed to a fixing member 6.

The second hinge 3 has one end fixed to the arm 1 in parallel with and close to the first hinge 2, and the other end fixed to a fixing member 7 integrated with the fixing member 6.

1st. The fixing structure of the second hinge 2.3 will be explained in more detail as follows.

The first hinge 2 is fixed to the side surface of the notch 8 of the joining member 5 by brazing or the like, and the second hinge 3 is fixed to the side surface of the fixing member 7 located above the notch 8 of the joining member 5. It is fixed by brazing or the like and is parallel to and close to the first hinge 2. That is, the second hinge 3 of the joining member 5
．． The portion of the fixing member 7 that overlaps with the fixing portion is cut out on the second hinge 3 side, and the second hinge 3. The fixing portion of the fixing member 7 is notched on the first hinge 2 side. Therefore, without having to divide the second hinge 3 into two as in the conventional case, the first hinge 3.
The interval between the second hinges 2.3 can be reduced, the width is reduced, and the mounting efficiency is improved.

The operation of the displacement magnification mechanism having such a configuration is as follows.

When the piezoelectric element 4 is charged by energization, the joining member 5 moves upward by a predetermined amount due to the displacement of the piezoelectric element 4, and a compressive force acts on the first hinge 2. As a result, each hinge 2, 3
is deformed as shown by the chain line due to the bimetal effect, and the arm 1 rotates clockwise to the position shown by the chain line. When applying this displacement magnification mechanism to the printing node, the printing node is constructed by fixing the printing wire 9 to the other end (left end) of the arm, and when the arm 1 rotates, the printing wire 9, printing is performed. In this case, the printing wire 9 is given an enlarged displacement and a sufficient printing stroke is obtained. Then, when the power supply to the piezoelectric element 4 is stopped at a predetermined time (immediately before the completion of printing in the case of a print head), discharging of the piezoelectric element 4 is started, and as the piezoelectric element 4 that has completed discharging returns, the arm 1 moves to each hinge. 2. Return to the original position with 3.

In this case, the piezoelectric element 4 is quickly displaced and returned, so if this displacement magnification mechanism is applied to the print head, it is possible to increase the printing speed. In addition, the first width can be adjusted without increasing the width. Since the distance between the second hinges 2 and 3 can be reduced, mounting efficiency is improved.

Displacement amplification efficiency can be improved.

(Effect of the invention〕 As described above, according to the present invention, mounting efficiency can be improved.

It is possible to obtain a displacement amplification mechanism with high displacement amplification efficiency.

[Brief explanation of drawings]

FIG. 1 is a side view of a displacement amplifying mechanism according to an embodiment of the present invention, FIG. 2 is a perspective view showing the main parts of FIG. 1, FIG. 3 is a perspective view of a conventional displacement amplifying mechanism, and FIG. 4 is a perspective view of a conventional displacement amplifying mechanism. 3 is a perspective view showing the main parts of FIG. 5. In the figure, 1 is an arm, 2 is a first hinge, 3 is a second hinge, and 4 is a piezoelectric 5 is a joining member, 6.7 is a fixing member, and 8 is a notch.

Claims (1)

[Scope of Claims] An arm (1), a thin plate-shaped first hinge (2) with one end fixed to one end of the arm (1), and one end fixed to the first hinge (2) a piezoelectric element (4) whose other end is fixed via a joining member (5) and whose other end is fixed to a fixing member (6); and the first hinge (2)
and a thin plate-shaped second hinge (3) having one end fixed to the arm (1) and the other end fixed to the fixing member (7) parallel to and close to the joint. A portion of the member (5) that overlaps with the second hinge (3) and the fixing portion of the fixing member (7) is cut out on the second hinge (3) side, and the second hinge (3)
, the first hinge (2) of the fixing part of the fixing member (7).
) side is cut out.