JPS63116865A - Printer - Google Patents

Abstract

PURPOSE:To increase a printing speed by making the tilting movement of a tilting body light, by a method wherein a body to operate in conjunction with each other is parallelly moved in the expansion and contraction direction of a piezoelectric element with respect to the support of a frame main body by the expansion and contraction of the piezoelectric element and the tilting body is tilted around the hinge part on the side of the support in integral relation to a connection part to allow a printing wire to advance and retract. CONSTITUTION:When a piezoelectric element 5 extends in the direction shown by an arrow A by the application of voltage, a body 14 to operate in conjunction is parallelly moved in the extending direction of the piezoelectric element 5 in a state supported by links 8, 9. With the movement of the body 14, the link 8 is tilted around the first hinge part 10 and a tilting body 17 is tilted in the direction shown by an arrow B in integral relation to the link 8. Leaf springs 18, 19 are elastically deformed in a curved shape by the tilting of the tilting body 17. The extension of the piezoelectric element 5 is markedly increased by the tilting of the tilting body 17 and the elastic deformation of the leaf springs 18, 19 and the stroke of a printing wire 21 necessary for printing is obtained. When the piezoelectric element 5 is shortened to the original state, the body 14, the tilting body 17 and the leaf springs 18, 19 are respectively returned to the original states and the printing wire 21 is retracted.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a print head of a wire dot type printer, in which a printing wire is moved forward and backward by the expansion and contraction of a 1-mo wire by applying a voltage. It's about location.

(Prior art) This type of printing device includes, for example, Japanese Patent Laid-Open No. 58-18867
There is one disclosed in Publication No. 2. In this case, by the expansion and contraction of the piezoelectric body 4, the first and second movable members (tilting bodies) 13.15 are tilted in opposite directions using the fourth and fifth coupling members 16.18 as fulcrums, respectively. 3rd tTJ
A bottle (printing wire) 24 provided at the tip of the movable member 21 is moved forward and backward.

(Problems to be Solved by the Invention) However, in the conventional device described above, it is necessary to tilt the first and second pivoting members 13 and 14 by the piezoelectric body 4, and these pivoting members The weight and inertia of 13 and 14 make it difficult to handle high-speed printing.

(Means for Solving the Problems) Therefore, in the present invention, there is provided a printing device in which a printing wire V is moved forward and backward by expansion and contraction of a piezoelectric element due to the application of voltage, and a frame main body is provided with one end of the piezoelectric element. is fixed to the support provided on one side of the frame main body, and an interlocking body that is connected to the other end of the piezoelectric element is connected to the support body provided on one side of the frame body by a connecting portion having four hinge portions so as to form a 4 m link mechanism. Connected so as to be movable in parallel in the direction of expansion and contraction of the piezoelectric element,
A tilting body having a printing wire at its tip is provided on the connecting portion so as to be tiltable integrally with the connecting portion.

(Function) Therefore, in the present invention, when the piezoelectric element is expanded and contracted by applying a voltage, the interlocking body is guided by the connecting part having four hinge parts with respect to the support of the frame main body in the direction of expansion and contraction of the piezoelectric element. Along with this movement of the interlocking body, the tilting body is tilted integrally with the connecting part using the hinge part on the support body side as a fulcrum, thereby moving the printing wire forward and backward.

In other words, when the piezoelectric element expands and contracts, one tilting body is tilted and its printing wire advances and retreats. Unlike the structure in which two tilting bodies are tilted, the tilting of the tilting body becomes easier and speeds up printing. It becomes possible to deal with it. Furthermore, by providing the tilting body integrally with the connecting portion having the four hinges n1, the structure can be made extremely simple.

Furthermore, when the piezoelectric element expands and contracts, the interlocking body is moved in parallel in the direction of expansion and contraction, so that the problem of bending moment acting on the piezoelectric element due to movement of the interlocking body is also prevented.

(Example) An example of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view showing the main parts of the printing device installed in the print head of a dot matrix printer;
In FIG. 2, viewed from the side, the frame body 1 is formed from a metal plate having a predetermined thickness. This frame body 1 includes a base portion 2 having a support surface 2a that supports one end surface (lower end surface in FIG. 2) of a piezoelectric element 5, and one side (left side in FIG. 2) of this base portion 2. The side surface is formed in an abbreviated shape, with the support body 3 formed as a main body. On the support surface 2a of the base portion 2, there is a 'VAF
An I-shaped piezoelectric element 5 made of piezoelectric ceramic is supported at its lower end surface by adhesive or the like.

Inside the support body 3 at approximately the mid-height level, first and second links 8.9 of the same length and parallel are vertically opposed across the elongated separation hole 7, and one end thereof is provided. The first and second hinge parts 10.11 are connected to each other by an elastically deformable hinge part 10.11. An interlocking body 14 is connected to the other ends of the first and second links 8 and 9 by elastically deformable third and fourth hinge parts 12 and 13. The interlocking body 14 is supported by the support body 3 so as to be movable in parallel in the direction of expansion and contraction of the piezoelectric element 5, with its lower surface being joined to the upper end surface of the piezoelectric element 5.

A tilting body 17 is formed on the first link 8 so as to be integral with the link 8 and parallel to the support body 3 and having the same width as the length of the link.

The upper end of the tilting body 17 extends a predetermined height higher than the lower end surface of the support 3, and is located on one side (the side facing the inner surface of the support 3) of the upper end of the tilting body 17. A notch-shaped holding groove 17a is formed.

A first plate spring 18 is fixed at its base to the holding groove 17a of the tilting body 17 by welding, brazing, or the like. In this embodiment, the first leaf spring 18 is
As shown in the figure, it is made of a substantially rectangular plate spring material, and has a rectangular punch hole 18a in the center thereof into which the tilting body 17 can be inserted. Then, the first plate spring 18 has its hole 18al, and the tilting body 17
The base piece 18e is inserted into the upper end of the holding groove 17.
8 and is fixed by welding, brazing, etc.

A second leaf spring 19 made of a leaf spring material longer than the first leaf spring 18 is fixed to the upper end surface of the support body 3 at its base by welding, brazing, or the like. The second leaf spring 19 is superimposed along the lower surface of the first leaf spring 18 so as to be elastically deformable separately from the first leaf spring 18, and the tilting body 17 The top part is T! A handling hole 19 a lfi is provided with a size that allows the tilting body 17 to tilt.

Furthermore, the tip of the second leaf spring 19 extends to the tip of the leaf spring 18, and both the first and second leaf springs 1
The tips of 8.19 are fixed together by brazing.

A wire support arm 20 is fixed to the distal ends of the first and second leaf springs 18 and 19, which are fixed to each other, by brazing at the proximal end portions thereof. The base end of a printing wire 21 is fixed to the tip of the support arm 20 by brazing.

In this embodiment, a predetermined number of through holes 23 are provided in the longitudinal direction of the tilting body 17, and a predetermined number of through holes 24 are provided in the longitudinal direction of the wire support arm 20. The weight of the tilting body 17 and the wire support arm 20 is reduced.

In this embodiment configured as described above, when a voltage is applied between both electrodes of the piezoelectric element 5 and the piezoelectric element 5 extends in the six directions of arrows in FIG.
, while supported by both second links 8 and 9, is translated in parallel in the direction in which the piezoelectric element 5 extends. As the interlocking body 14 moves, the first link 8 is tilted about the first hinge portion 10, and the tilting body 17 is tilted in the direction of arrow B together with the first link 8.

When the tilting body 17 is tilted in the direction of arrow B, the bases of the first and second leaf springs 18 and 19 whose tips are mutually fixed are first fixed to the upper end of the tilting body 17. The first leaf spring 18 is tensioned. Then, the second leaf spring 19, whose base is fixed to the upper end surface of the first support 3 of the frame body 1, is elastically deformed into a curved shape as the first leaf spring 18 is pulled. The spring 18 is also elastically deformed into a curved shape in the same direction. Then, the wire support arm 20 fixed to the tips of the first and second leaf springs 18 and 19 is tilted forward, and with the printed white t721 guided by a predetermined number of guide members 22, Its leading edge is advanced to the printing position.

That is, the elongation of the piezoelectric cord 5 is significantly expanded by the tilting of the tilting body 17 and the curved elastic deformation by both the first and second leaf springs 18, 19, so that the printing wire 21 necessary for printing is expanded. strokes are obtained.

When the piezoelectric element 5 is shortened to its original state, the interlocking body 14
, the tilting body 17 and both the first and second leaf springs 18, 19 are returned to their original states, and the printing wire 21 is retracted.

When the piezoelectric cord 5 is expanded or contracted, the interlocking body 14 is supported by the first and second links 8° 9 with respect to the support 3 of the frame body 1, and the interlocking body 14 is connected to the piezoelectric element. It is translated in parallel in the expansion/contraction direction of 5. From this,
It is possible to prevent the bending moment 1- from acting on the piezoelectric cord 5 and prevent damage to the piezoelectric element 4 caused by tensile load.

Note that this invention is not limited to the above embodiments.

(Effects of the Invention) As described above, according to the present invention, the interlocking body is moved in parallel in the direction of expansion and contraction of the piezoelectric element by the expansion and contraction of the piezoelectric element due to the application of voltage, and the parallel movement of the interlocking body causes the The printing wire can be advanced or retreated by tilting the tilting body integrally with the connecting part using the hinge part on the support side as a fulcrum. Therefore, when the piezoelectric element expands and contracts, one tilting body is tilted to move the printing wire forward and backward.
In terms of iR, unlike a system in which two tilting bodies are tilted, the tilting body can be tilted easily, and the printing speed can be increased. Furthermore, by providing the tilting body integrally with the connecting part having four hinge parts, the structure can be made extremely simple and can be provided at low cost.

Moreover, when the piezoelectric element expands and contracts, the interlocking body is moved in parallel in the direction of expansion and contraction, so it is possible to prevent a problem in which bending moment 1- is applied to the piezoelectric element due to the movement of the interlocking body. can.

For this reason, even if a piezoelectric cord, such as piezoelectric ceramic, is used, which has a characteristic of being weak against bending moment i, sufficient durability can be achieved at 1q.
It also has the effect of being covered.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a perspective view showing a printing device, Fig. 2 is a side view of the printing device, Fig. 3 is a plan view, and Fig. 4 is a FIG. 3 is a side view showing a state in which the tilting body is tilted.

Claims (1)

[Scope of Claims] A printing device in which a printing wire is moved forward and backward by expansion and contraction of a piezoelectric element due to the application of voltage, wherein one end of the piezoelectric element is fixed to a frame body, and one end of the piezoelectric element is fixed to one side of the frame body. The supporting body provided in the piezoelectric element is capable of moving in parallel in the expansion and contraction direction of the piezoelectric element by means of a connecting part having four hinge parts so as to form a four-section link mechanism, so that an interlocking body joined to the other end of the piezoelectric element can be moved in parallel. 1. A printing device, characterized in that a tilting body having a printing wire at its tip is provided on the connecting portion so as to be tiltable integrally with the connecting portion.