JPS62253461A - Production of print element - Google Patents

Abstract

PURPOSE:To enable a print element to be produced with favorable accuracy irrespective of the scattering of the dimensions of a piezoelectric element, by bringing a U-shaped member into contact with an end of the piezoelectric element, and fixing the U-shaped member and an opposed part of a base member under the condition where a pre-load is exerted on the piezoelectric element by pressing the U-shaped member. CONSTITUTION:A support member 7 for supporting an end of a piezoelectric element 2 is brazed to a hinge part 11 of a print element. An opposed part 1a of a base member 1 is clamped by a U-shaped member 8, and the piezoelectric element 2 is fitted between the U-shaped member 8 and the support member 7. Under the condition where a predetermined pressure is exerted on the U-shaped member 8 by a positioning and pre-loading jig 9 not making contact with the opposed part 1a of the base member 1, the U-shaped member 8 and the opposed part 1a of the base member 1 are spot welded to each other. Full welding is conducted after removing the jig 9. The print element can be produced with favorable accuracy, since scattering of the dimensions of the piezoelectric element can be absorbed by the U-shaped member.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is characterized in that the printing element, particularly the piezoelectric element, is welded to the base member while a voltage is applied to the piezoelectric element to make the characteristics of the printing element uniform. The present invention relates to a method of manufacturing a printing element.

Conventional Printing Element 4 A conventional printing element is constructed as shown in FIG. In FIG. 4, the facing portion 1a of the base member 1,
A piezoelectric body (piezoelectric member) 2 whose length increases due to the piezoelectric effect when a driving voltage is applied is held between the lbs. Further, one end of the first displacement transmitting member 3 is connected to the end of the facing portion 1a of the base member 1, and one end of the second displacement transmitting member 4 is connected to the extending portion 1c of the facing portion tb of the base member 1. ing. The other end of the first and second displacement transmitting members 3.4 is connected to the end 5a of the movable member 5 at a distance, and one end of the printing wire 6 is connected to the other end 5b of the movable member 5. It is fixed.

Moreover, 1O111 are the first and second hinge parts provided in the facing part 1b, respectively.

In the conventional printing element configured in this way, when a voltage is applied to the piezoelectric body 2, the piezoelectric body 2 expands and the elongated portion 1
c rotates in a clockwise direction about the first hinge portion lO, and along with this rotation, the second displacement transmitting member 4 is rotated clockwise and pulled downward, and at the same time, the second displacement transmitting member 4 The upper part of the displacement transmitting member 3 follows rightward. Therefore,
The movable member 5 rotates clockwise around the first displacement transmitting member 3.

Accordingly, the printing wire 6 fixed to the other end 5b of the movable member 5 is expanded and moved upward as shown by the arrow, so that the tip of the printing wire 6 can perform a dot printing operation. Note that the first and second displacement transmitting members 3.4. Movable member 5
．． The extension portion 1c, the first and second hinge portions 10.11, etc. constitute a displacement delivery mechanism.

However, in this printing element, in order to sandwich the piezoelectric body 2 between the facing parts 1a and lb of the base member 1,
It is difficult to match the length of the piezoelectric body 2 to the dimension between the facing parts 1a and tb, and if the length of the piezoelectric body 2 is manufactured without matching the dimension between the facing parts 1a and 1b, printing will not work. 1st inside. There were disadvantages in that abnormal stress was applied to the second displacement transmission member 3.4, causing it to break, and when multiple printing elements were combined to print multiple dots at the same time, uneven density occurred in the print. .

On the other hand, the size of the elongation that occurs in the piezoelectric body 2 during driving is as follows.

When the length of the piezoelectric body 2 is, for example, 2 cm, when a voltage of, for example, 200 V is applied as the driving voltage, the length is about 10 μm. Therefore, in order to reduce the dimensional difference between the piezoelectric body 2 and the facing parts la and lb of the base member 1 to 10 μm or less, a process such as selection of combinations of dimensions or rubbing for dimension matching is required. The disadvantage is that it requires a lot of man-hours.

In order to solve the above-mentioned problems, the present invention provides a piezoelectric member whose length increases when a driving voltage is applied, which is sandwiched between opposing parts of a base member, and which is mechanically displaced. In a printing element equipped with an electric transmission mechanism and a printing wire fixed to the other end of the movable member of the displacement electric transmission mechanism, the piezoelectric member is attached to a mouth-shaped member that holds the one opposing portion of the base member. Welding the mouth-shaped member and one opposing portion of the base member from the side surface of the mouth-shaped member while bringing their one ends into contact with each other and applying a voltage in the axial direction of the piezoelectric body through the mouth-shaped member. It is characterized by

According to the present invention, the other end of the piezoelectric body is supported by the other opposing portion of the base member, and the mouth-shaped member that clamps the one opposing portion of the base member is brought into contact with one end of the piezoelectric body, and the base member The mouth-shaped member is welded to the opposing part of the base member while applying voltage to the piezoelectric body by pressing the mouth-shaped member so as not to contact one of the facing parts of the base member and the movable member of the displacement delivery mechanism.

Figures 1 (a), (b) and (c) are front, side and top views of a printing element according to an embodiment of the present invention;
The figure is a partially enlarged view of FIG. 1.

In the figure, a base member 1, opposing parts 1a and tb, an extension part 1c, a piezoelectric body 2, a first displacement transmitting member 3. Second displacement transmission member 4. Movable member 5. Since the printing wire 6 and the first and second hinge parts 10 and 11 are the same as those in the conventional example shown in FIG. 4, their explanation will be omitted. The support member 7 that supports the other end of the piezoelectric body 2 is brazed. In addition, the facing portion 1a is the both side portions 8a of the mouth-shaped member 8.
The piezoelectric body 2 is held between the bottom surface 8b of the mouth-shaped member 8 and the supporting member 7, and both ends of the piezoelectric body 2 are fixed.

Therefore, a gap is provided between the inner surface 8c of the mouth-shaped member 8 and the facing portion 1a. Then, as shown in FIG. 3 (explanatory view of the method for manufacturing a printing element), a predetermined pressure (for example, 2 kg) is applied using the pressure measuring device 9a, and while pressing both sides 8a of the mouth-shaped member 8, spot welding (for example, laser When beam welding) is performed, the facing portions 1a of the mouth-shaped member 8 and the base member 1 are welded. and 1 positioning voltage jig 9
Perform the main welding after removing.

In this embodiment, the mouth-shaped member 8 is attached to one end of the piezoelectric body 2 in this way.
When the mouth-shaped member 8 is pressed and a voltage is applied to the piezoelectric body 2, the facing portion 1 of the mouth-shaped member 8 and the base member is brought into contact with each other.
Since a is fixed, there is no difference even if the dimensions of the piezoelectric body 2 vary, and printing elements can be manufactured with high precision.

As is clear from the above description, the present invention supports the other end of the piezoelectric body at the other opposing portion of the base member, and the U-shaped member sandwiching one opposing portion of the base member is piezoelectric. Weld the U-shaped member to the opposing part of the base member while applying voltage to the piezoelectric body by pressing the U-shaped member so that it is in contact with one end of the body and not touching one opposing part of the base member and the movable member. This has the advantage that even if there is variation in the dimensions of the piezoelectric body, the variation in dimension can be absorbed by the U-shaped member, and a printing element with high precision can be manufactured.

[Brief explanation of drawings]

1(a), 1(b) and 1(c) are a front view, a side view and a top view of a printing element according to one embodiment of the present invention;
1 is an enlarged perspective view of a portion of FIG. 1, FIG. 3 is a diagram for explaining a method of manufacturing the printing element shown in FIG. 1, and FIG. 4 is a front view of a conventional printing element. ■...Base member, la, lb...opposite part, 2...
・Piezoelectric body, 3...first displacement transmission member, 4...second
5... Movable member, 6... Printing wire, 7... Supporting member, 8... U-shaped member, 8a
...both sides, 8b...bottom, 8c...inner surface, 9
...Positioning voltage jig, 9a...Pressure gauge side device. Applicant: Tokyo Heavy Equipment Industry Co., Ltd. Figure 1 ((')

Claims (1)

[Claims] A piezoelectric member that generates dimensional strain due to the piezoelectric effect, a base member that supports the piezoelectric member, a displacement transmission mechanism that transmits the dimensional strain to generate displacement in a predetermined direction, and a movable member of the displacement delivery mechanism. In the printing element having a printing wire fixed to the other end, one end of the piezoelectric member is brought into contact with a U-shaped member that holds the one opposing portion of the base member, and the piezoelectric member is inserted through the U-shaped member. A method for manufacturing a printing element, characterized in that the U-shaped member and one opposing portion of the base member are welded from a side surface of the U-shaped member by applying a voltage in the axial direction of the U-shaped member.