JPS5981181A - Printing head for electrostrictive-type wire dot printer - Google Patents

Abstract

PURPOSE:To damp residual vibration, enable to print at a high speed and enhance print quality, by providing electromagnets at a base part of a printing head for an electrostrictive-type wire dot printer. CONSTITUTION:In an electrostrictive-type head comprised of an electrostrictive element 101, two levers 107, 108 connected to the element 101 through hinges 104, 105, the base part 102 supporting the element 101 and connected to the levers 107, 108 through hinges 103, 106 and the like, the electromagnets 401, 402 are provided at the base part 102. An arm part 113 of the third lever is formed by a material having such a property as to be attracted by the magnets. When a wire 114 collides against a printing medium 115 and returns to an initial position, the electromagnets 401, 402 are excited, whereby the arm part 3 of the third lever is forcibly attracted onto a stopper 119 to damp the residual vibration.

Description

[Detailed Description of the Invention] This impact-type wire tod printer using an electrostrictive element has the advantages of being able to make simultaneous copies on plain paper, having excellent flexibility in recording kanji and figures, and being inexpensive. Because of this, it has been widely mentioned.

Recently, one direction in the development of wire dot printers is to increase the speed of the printers as a result of improvements in performance such as an increase in the storage capacity of microcomputers and a reduction in calculation time.

Conventionally, the mainstream printing method for wired printers is the electromagnetic drive type, but the drive power is large (and when trying to increase the speed of the printer, eddy currents are generated and the temperature rise is extremely large, creating a bottleneck.

In contrast, printers using electrostrictive elements are attracting attention because they can, in principle, eliminate the drawbacks of the electromagnetic type. However, in order to print in relation to either method, the flying wire must hit the platen through the recording medium and at the same time start the next flight, and the wire will collide with the recording medium and stop. It is important to keep the residual vibration to a minimum.

In other words, at the start of the second flight (1), the thicker the residual vibration, the more the kinetic energy and strain energy of the printer head due to the force of the previous flight are superimposed; Kinetic energy increases,
After the second printing, the print density becomes higher and it becomes impossible to obtain a uniform print.

Hereinafter, a conventional example will be described in detail with reference to the drawings.

FIG. 1 shows a head for an impact type wire tod printer using a conventional electrostrictive element. That is, electrostrictive element 1
01 and the electrostrictive element via hinges 104 and 105, and rotates in different directions.
7 and the second lever 108 and the electrostrictive element, and the first and second lever 107 and the hinge 103.
．． 106 and the base 102 connected through
and is connected to the second lever via hinges 110, 111, and has an arm portion 113? A<3 lever 112. A stopper for the first lever and the arm is formed on the second lever and the base, respectively. In the printer shown in FIG. 1, when a voltage is applied to the electrostrictive element 101, the electrostrictive element 101
extends, hinges 104 and 105 are compressed, and hinge 10
3,106 are expanded. As a result, @Ruba107.
The second levers 108 rotate in different directions. Furthermore, the movement of the two levers is caused by hinges 110 and 111.
is transmitted to the third lever and the arm 113 connected thereto. Then, the wire 114 connected to the arm 113 goes straight in the direction of the arrow, and the ribbon 1151 paper 116. Printing is performed by striking the platen 117. Due to the repulsive force of this impact and the restoring force of the hinge, the wire 114 returns to its original position, completing one reciprocating movement.

Generally, when the wire returns to its original position, the applied voltage is reduced to zero, but at this time, the strain energy of the head itself has not been completely reduced to zero, so residual vibrations are noticeable.

This state is shown by the solid line in FIG. 2(a). A large residual vibration force 5 is seen past the point where the displacement is zero. The head used in Figure 2 is the print head shown in Figure 1, the distance from the wire tip to the ribbon is 40.40++ m, and the electrostrictive element is an S-effect multilayer ceramic made of titanium-lead zirconate-based materials. Using a mover (4 yellows 3++m+, depth 2mm, length 18mm), Herad's displacement magnification rate is 42 times. FIG. 2(b) shows the driving voltage waveform of the electrostrictive element 101, and the voltage is zero at a time of 0.48 msec when the wire is restored to its original position.

Furthermore, in the printer shown in FIG. 1, the displacement of the wire tip and the ribbon, paper,
The characteristics of the impact force applied to the platen are shown by the solid line in Fig. 3 (a). Further, the driving voltage waveform is shown in FIG. 3 (b). In this way, if no measures are taken to suppress the residual vibration of the wire in the printer head, a much larger impact force (fm) will be applied during the second printing compared to the impact force (fm) during the first printing. Also, the residual vibration of the wire is extremely large compared to the one-time printing shown in FIG. SUMMARY OF THE INVENTION An object of the present invention is to provide a print head for an electrostrictive wire tod printer that can overcome these drawbacks and suppress residual vibrations to a small level. That is, the present invention includes an electrostrictive element, a first lever and a second lever that are connected to the electrostrictive element via a hinge, and rotate in different directions from each other, and that hold the electrostrictive element; An electrostrictive wire comprising: a base connected to a second lever via a hinge; and a third lever connected to the first and second levers via a hinge and further having an arm portion. This is an electrostrictive wired print head for a tod printer, characterized in that an electromagnet is formed in the base portion of the tod printer head.

As an embodiment of the present invention, FIG. 4 shows an electrostrictive printer head in which electromagnets 401 and 402 are formed on the base portion. In order for the electromagnet of the present invention to work, it is necessary that the arm portion 113 of the third lever be made of a material (such as steel) that has the property of being attracted by a magnet. In FIG. In this embodiment, the base material is made of steel.

First, one reciprocating movement of the wire will be explained. As shown in FIG. 2(O), the drive voltage waveform of the electrostrictive element 101 is a rectangular wave in which the voltage is zero at 0.48 m5ec when the wire is similarly restored. At the same time, the electromagnet is energized near 0.48m5ec, where the wire is restored.

The excitation voltage waveform is shown in 53.2171 (c), and the displacement of the tip of the wire at this time is shown in points in FIG. 2 (a).

It can be seen that the residual vibration is significantly suppressed compared to the smile line. The principle of the present invention is that when the wire collides with the printing medium and returns to its original position, the electromagnets 401 and 40
2 is excited, and the second lever arm 113 is forcibly attracted to the stopper 119, thereby minimizing the residual vibration 1.h. Next, the time response of the wire tip displacement and impact force in the case of two consecutive impacts according to the present invention is shown in FIG. 50). The drive voltage waveforms and excitation voltage waveforms at this time are shown in Figure S5 and (Figure 413), respectively.The drive voltage waveforms of the electrostrictive element are the same as in Figure 413. When the excitation voltage is applied, the electromagnets 401 and 402 are similarly excited when the wire returns to its original position, and the second lever arm 113 is forcibly attracted to the stopper 119 to suppress residual vibration. , In order to perform the second flight, the excitation voltage is set to zero when applying the 1-pot dynamic voltage. Figure 5 (a) shows that the residual vibration is sufficiently suppressed compared to the characteristic of Figure 3 (a) where no measures have been taken to suppress residual vibration, and the impact during the first and second printing is It is clear that the power is also the same. That is, in the present invention, the residual vibration of the wire is suppressed to a minimum, and the second
When the wire starts flying for the third time in a row, the excitation voltage of the electromagnet is set to zero, so the electricity (iiF, stone) does not pose any obstacle to the wire's flight.

As described in detail above, according to the present invention, the residual vibration of the wire is suppressed, and since there is no obstacle to the next flight of the wire, ideal wire movement is achieved. Therefore, as a result of obtaining a uniform impact force, it is possible to obtain a high-speed printing electrostrictive wire tod printer with a uniform printing surface.

In this embodiment, the electromagnets are formed at two locations on the base portion, but the effectiveness of the present invention will not be lost even if the electromagnets are provided at one location.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of a conventional electrostrictive wire tod printer head. Figure 2 0) is a time response characteristic diagram of wire tip displacement due to only the first printing, Figure 2 ←) is the applied voltage waveform of the electrostrictive element, and Figure 2 f is the excitation of the electrostrictive head of the present invention. Voltage waveform diagram, Figure 3 0) is a time response characteristic diagram of wire tip displacement and impact force due to two consecutive printings in a conventional electrostrictive head, No. 31i:? ! (B) is a voltage waveform diagram applied to an electrostrictive element, and FIG. 1 is a diagram showing an embodiment of the electrostrictive wired printer head of the present invention. Figure 5 0) is a time response characteristic diagram of the wire tip displacement and impact force due to two consecutive printings with the electrostrictive wire tod printer head shown in Figure 4, and Figure 5 ←) is the applied voltage waveform of the electrostrictive element. Fig. 5 f
Drawing excitation voltage waveform diagram. In the figure, 101 is an electrostrictive element, 102 is a herad base, 103, 104 . ]05.106,110.111
107, 108, 112 are the fourth lever, the second lever, and the third lever, 113 is the arm part of the third lever, 114 is the wire, 115 is the ink ribbon,
116 is paper, 117 is platen, 118.119 is stopper, 401°"°' (1 electric 6 strong stone A; minute 7
．． 1.1, h = tt, an-+-r# [a1. ~,
Ring 1 figure/62 82 figure 0 6.2 5.4 t), 6
0.8 o'clock M (package sec') 3 Shock level (A/) 當ヮい坤－前文品Friend Atshi (7-) Voltage (V) boundary 4 figure 5 figure clear Seki (starvation SεC)

Claims (1)

[Claims] an electrostrictive element; first and second levers connected to the electrostrictive element via a hinge and rotating in different directions; and first and second levers that hold the electrostrictive element; and a base connected via a hinge to the first and second
An electrostrictive head for an electrostrictive wire tod printer comprising a third lever connected to the lever via a hinge and having an arm part, the head having an electromagnet formed in the base part. Print head for wire tod printers.