JPS62286754A - Impact recording head - Google Patents

Abstract

PURPOSE:To miniaturize a recording head and to reduce manufacturing cost, by shaking a plurality of respective movable members by a converter element to respectively drive a plurality of wires. CONSTITUTION:Each of movable members 5 is instantaneously shaken around a connection part 51 in the direction shown by an arrow G and strikes each of recording wires to apply kinetic energy thereto. The recording wire 11 flies in the direction shown by an arrow H against the spring force of a coil spring 80 and the leading end thereof strikes recording paper through an ink ribbon to perform dot recording. A plurality of the recording wires 11 are respectively driven through a plurality of the respective movable members 5 integrally constituted through a connection member 52. As a result, the number of parts are reduced markedly and a structure becomes extremely simple. Therefore, manufacturing cost can be reduced to a large extent.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention [Field of Industrial Application] The present invention relates to an impact recording head, and in particular uses an electric/mechanical energy conversion element such as a piezoelectric material or an electrostrictive element as a driving source of a recording wire. The present invention relates to an impact recording head that drives the wire through a movable member driven by the element.

[Prior Art] A conventional impact recording head of this type that utilizes the piezoelectric longitudinal effect of a piezoelectric body is shown in FIGS. 3 and 4 (A).
, (B) have been proposed.

FIG. 3 shows the structure of a recording unit that drives each of the recording wires in the recording head. Reference numeral 4 designates a piezoelectric body as a driving source, which is fixed to a fixing member 3 made of metal for fixing the piezoelectric body.

At the tip of the piezoelectric body 4, there are first and second movable members 5, 7.
are combined. This movable member 5.7 is integrally formed in a plate shape with the fixed member 3 made of metal, and is coupled to the piezoelectric body 4 and the fixed member 3 via a thin joint so as to be elastically swingable. There is.

Further, first and second transmission members 8.9 each made of a metal plate are fixed to the distal end of the movable member 5.7 on the negative end side, and the other ends of each of the transmission members 8 and 9 are fixed to the distal end of the movable member 5.7. Similarly, a third movable member 10 made of a metal plate is fixed.

A recording wire 11 is fixed to the tip of the movable member 10.

When a driving voltage is applied to the piezoelectric body 4 in such a structure, dimensional distortion occurs in the piezoelectric body 4 due to the piezoelectric longitudinal effect, and the piezoelectric body 4
extends in the longitudinal direction, and the movable members 5.7 operate as levers, displacing the upper ends of each in the arrow direction and the E direction. These mutually opposite displacements give a rotational moment to the movable member 10 via the transmission member 8.9, whereby the recording wire 11 is interlocked in the direction of the arrow F, and is transferred via an ink ribbon (not shown) to the movable member 10 through the transmission member 8.9. Hit the recording paper and do it.

A record is made.

By incorporating a plurality of such recording units, the image shown in Fig. 4 (
Impact recording heads as shown in A) and (B) are constructed.

That is, a plurality of recording units are divided into two sets, and the number 7 is divided into two sets.
Each group is stacked and attached as a recording unit block on a head stand shown by 2 to form a hend. The recording wires 11 of each unit are slidably guided through first to third alignment members 73 to 75 provided on the tip side of the head stand 72, and the tips are aligned in a line toward the recording surface. . The alignment members 74 and 75 also have the role of suppressing unnecessary vibrations caused by the recording wire during the recording operation.

To explain how to attach the recording units, first, an inclined spacer 77 is sandwiched between each recording unit, and a spacer 78 is placed below the lower unit. Next, screw 76
into the screw hole 12 of the fixing member 3 of each unit (see Figure 3).
and screw holes (not shown) in spacers 77 and 78, and tighten nuts 81 at the upper ends to connect each set of recording units as a recording unit block. Then, place each recording unit block on the head stand 72 and screw 79.
are passed through the spacer 78 and the head stand 72 and tightened with a nut 82 to fix each unit bronch.The incorporated recording units are arranged radially through the inclination of the spacer 77.

[Problems to be Solved by the Invention] The impact recording head as described above utilizes the piezoelectric longitudinal effect, and therefore has excellent energy efficiency and response speed.

However, in the above-mentioned structure, in order to expand the small amount of dimensional distortion of the piezoelectric body 4 to the necessary amount of displacement of the recording wire 11 and transmit it to the recording wire 11, the movable member 5
, 7. Since the drive force of the piezoelectric body 4 is transmitted to the recording wire 11 via the transmission members 8 and 9 and the movable member 10, which is a complex structure with a large number of parts, the manufacturing cost of the head is high. There was a problem.

In addition, the structure in which two sets of recording unit blocks are mounted as shown in FIGS. 4(A) and (B) is a head structure for recording kanji in Mincho typeface, but it is especially difficult to use in such cases. Another problem is that the structure of the recording unit as described above is complicated and the recording unit cannot be miniaturized, so the head as a whole cannot be miniaturized.

[Means for solving the problem] In order to solve the above-mentioned problem, according to the unissued IJ1,
In an impact recording head that uses an electrical/mechanical energy conversion element as a drive source for a recording wire and drives the wire via a movable member driven by the conversion element, the movable member is configured in a lever shape, and the movable member The movable member is integrally configured with a coupling member that supports the movable member movably at its intermediate portion and couples the plurality of movable members, and each of the plurality of movable members is swung by the conversion element. Each of the plurality of wires is driven.

[Function] According to such a structure, each of the plurality of wires is driven through each of the plurality of movable members integrally configured via the coupling member, and the coupling member and the plurality of movable members are connected to each other. Since the structure is made up of one component, the number of parts is significantly reduced compared to the conventional method. In addition, the number of parts is significantly reduced, and the structure is extremely cylindrical, so the entire head can be made smaller.

[Example] Hereinafter, details of embodiments of the present invention will be described.

1 and 2 show the structure of an impact recording head according to this embodiment.

In the illustrated structure, each of the piezoelectric bodies 4 serving as a drive source is constructed by providing a plurality of internal electrodes 42 in parallel at predetermined intervals within a piezoelectric material 41, and a pair of external electrodes (not shown) are provided on the side surfaces thereof. , every other internal electrode 42 is connected alternately to one and the other of its external electrodes.

A predetermined number of piezoelectric bodies 4 are arranged in a circular pattern at predetermined intervals and fixed to the lower surface of a collar portion 3a formed at the upper end of the outer periphery of the short cylindrical fixing member 3 in the figure. A movable member 5 formed in a substantially L-shaped lever shape is fixed to each of the lower end surfaces of the piezoelectric body 4 in the drawing.

Each of the movable members 5 is arranged radially and is connected to a ring-shaped coupling member 52 via a plate-shaped coupling portion 51 protruding from the middle part of the upper surface in the figure. 5 are connected together. All =r moving members 5 including the connecting portion 51 are integrally formed with the connecting member 52 from metal or the like, and if (the moving member 5 is connected to the connecting portion 51
The intermediate portion is swingably supported by the connecting member 52 through the elasticity of the connecting member 52 .

Further, a screw escape hole 5a is formed at a position of each movable member 5 opposing the coupling member 52, and the coupling member 52 opposing this
A screw relief hole 52a is also formed at each location, and this screw relief hole 5a.

The screws 76 are inserted into the fixing member 3 through each of the screw holes 52a.
The coupling member 52 is fixed to the fixed member 3 by tightening into the screw hole 3C formed on the lower end surface of the member 3, and each movable member 5 is supported.

On the other hand, a head stand 72 is fixed to the upper surface of the collar portion 3a of the fixing member 3. That is, screw relief holes 72a are formed at two locations on both sides of the head stand 72, and screws 79 are inserted through the screw relief holes 72a into the screw holes 3b formed on the upper surface of the collar portion 3a.
By tightening, the head stand 72 is fixed to the member 3.

The head stand 72 has guide holes 73a and 74a for slidably guiding each of the recording wires 11.

First to third alignment members 73 to 7 each having 75a.
5 are fitted in parallel, and the fixing part is closed. and a third alignment member 7
5 is arranged to face the tip of each movable member 5.

A hemispherical button part 11a is attached to the rear end of the recording wire 11 that is inserted through the alignment members 73 to 75, and a coil spring 80 is elastically loaded to the rear end of the wire 11 using this as a spring holder. . Both ends of the coil spring 80 come into contact with the button part 11a and the alignment member 75 and are compressed, and due to the elastic force that rebounds against the button part 11a and the alignment member 75, the button part 11 at the rear end of the wire 11
a is pressed against the tip of the movable member 5.

Next, the method of assembling this head will be described. First, the coil spring 80 is inserted into the recording wire 11, and then each of the recording wires 11 is inserted into the predetermined guide hole 75a in order of the alignment members 75, 74, and 73.

74a and 73a. and recording wire 11
The alignment members 73, 74, and 75 to which these are attached are respectively fitted into predetermined positions on the head stand 72 and fixed.

On the other hand, after each of the piezoelectric bodies 4 is arranged and fixed in a row at predetermined intervals on the side of the flange 3a of the fixed member 3, a connecting member 52 integrated with the movable member 5 is screwed onto the lower end face of the fixed member 3. 76 and fix it, and at that time, each movable member 5 and each piezoelectric body 4 are fixed.

Then, the head stand 72 to which the recording wire IT and the alignment members 73 to 75 have been attached is attached to the flange part 3 of the fixing member 3.
Tighten and fix the screws 79 on the top surface of a to complete the head.

Next, the recording operation of the head of this embodiment will be explained.

During recording, a driving voltage is applied between the internal electrodes of the piezoelectric material 4 via the external electrodes, thereby causing dimensional distortion in the piezoelectric material 41 due to the known piezoelectric longitudinal effect, causing the piezoelectric material 4 to instantaneously expand. At this time, the amount of dimensional distortion is on the order of several pm, but the generated force is on the order of tens of kgf, and a large impact force is generated.
It is applied downward to the right end portion of the movable member 5 in FIG.

As a result, the movable member 5 momentarily swings in the direction of arrow G in FIG.
Give it kinetic energy by hitting it. The recording wire 11 flies in the upward direction of the arrow in FIG. 1 against the force of the coil spring 80, and its tip hits the recording paper via an ink ribbon (not shown), thereby recording dots.

In this case, the coil spring 80 is not connected to the movable member 5 and is displaced by flying, so even if the amount of dimensional distortion of the piezoelectric body 4 is small and the amount of writhing of the movable member 5 is small, the amount of displacement of the recording wire 11 is A sufficient amount can be obtained for recording.

According to the present embodiment as described above, a plurality of movable units integrally configured via the coupling member 52 are not required, and the complicated mechanism for enlarging and transmitting the dimensional distortion of the piezoelectric body 4 as in the prior art is not required. Each of the plurality of recording wires 11 is driven through each of the members 5 .

Since the coupling member 52 and the plurality of movable members 5 are one integral part, the number of parts is significantly reduced and the structure is extremely simple. Therefore, manufacturing costs can be significantly reduced.

Furthermore, since the structure is simple and the number of parts is small, the entire head can be made smaller.

Of course, in the structure as described above, instead of the piezoelectric body 4, any other suitable psychrometric/mechanical energy converting element may be used.

[Effects] As is clear from the explanation in F below, according to the present invention, an electric/mechanical energy conversion element is used as a drive source for a recording wire, and the wire is transferred via a movable member driven by the conversion element. In the driving impact recording head, the movable member is configured in a lever shape, the movable member is swingably supported at an intermediate portion thereof, and a coupling member for coupling a plurality of the movable members is integrated with the movable member. It consists of
Since each of the plurality of movable members Ii is swung by the conversion element to drive each of the plurality of wires, the number of parts is significantly reduced compared to the conventional one, and the structure is extremely simple. As a result, manufacturing costs can be significantly lowered, and the head can be made smaller.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing the main structure of an impact recording head according to an embodiment of the present invention, FIG. 2 is an exploded perspective view of the same head, and FIG. 3 is a diagram showing the structure and operation of the recording unit 7) of a conventional head. 4(A)' and 4(B) are a top view and a side view, respectively, showing the structure of a conventional head composed of the unit and the unit shown in FIG. 3. 3...Fixed member 4...Piezoelectric body 5...Movable member 11...Recording wire 5■...Connection part
52...Connection member 72...Head stand 73-Q75...Alignment member 80...Coil spring Fig. 4 (A)

Claims (1)

[Claims] In an impact recording head that uses an electric/mechanical energy conversion element as a drive source for a recording wire and drives the wire via a movable member driven by the conversion element, the movable member is configured in a lever shape, and the movable member The movable member is integrally configured with a coupling member that swingably supports the movable member at its intermediate portion and couples a plurality of the movable members;
An impact recording head characterized in that each of the plurality of movable members is swung by the conversion element to drive each of the plurality of wires.