JPS60154083A - Printing head for dot printer - Google Patents

Abstract

PURPOSE:To obtain a structurally strong printing head for dot printer conserved in the number of assembling proesses and high in reliability, by providing the printing wire guide and support groove of a printing wire guide and support part so as to connect the same to a printing wire guide hole. CONSTITUTION:A printing wire guide and support part 17' is provided to the protruded part of a printing wire guide 17. A large number of printing wire guide holes 18 are provided to this guide and support part by drilling and printing wire guide and support grooves 18' is scored to the protruded part so as to be connected to the guide holes 18. A large number of printing wires 12 are inserted through the printing wire guide 17 in the order of four printing wire guides 17-1, 17-4 and printing wire guides are secured to printing wire guide hole grooves 15' in an inserted state. The secured parts 12' of the printing wires 12 of the printing head for thus assembled dot printer are secured to a leaf spring 9 and the leading end part 12' of each printing wire 12 is bent on the way thereof from the circular ring shaped arrangement thereof and arranged in two lines so as to provided a constant interval therebetween.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a print head for a dot printer that prints using a plurality of print wires, and particularly to a print head that can be easily assembled with high accuracy and small size.

An example of the assembly structure of a conventional print head for a dot printer is shown in FIGS. Figure 1 is a partially cut side sectional view, Figure 2 is a partial plan view of the movable body, and Figure 3 is a partially cutaway side sectional view.
The figure shows a partial perspective view of the printing wire guide bracket, and the second figure shows a front arrangement view of the printing wire after assembly.

The print head shown here is assembled in units of units, and λ units are combined to form the print head. First, as shown in Fig. 1, the first unit consists of an annular magnetic plate, a yoke part, and a plurality of cores
are integrally molded, and a coil is wound around each core. An annular non-magnetic spacer j is fixed to the front surface of the yoke part λ, and a spacer j is fixed to the front surface of the yoke part λ. An annular permanent magnet t is fitted and fixed inside the j.

Further, as a second unit, a guide bracket /j shown in FIG. 3 is fixed to the front surface of a disc-shaped lid yoke body /3 with a pin /7 as shown in FIG. 1, and the guide bracket l!
is a printing wire guide /7-/, /7-. for guiding and inserting a large number of printing wires /2. 2. /7-J, /
7-≠ ・ is attached and a large number of guide holes/♂ are bored.

As shown in FIG. 2, the printing wire 12 includes a movable support member 7 corresponding to each of the cores 3, a plate spring fixed at the base end on the inside of the front surface, and an armature J fixed to the plate spring. /'0 and the actuator /l at its tip are fixed. Further, the fixed parts /, 2' between the tip end of the actuator // and the base end of the printing wire /2 shown in Fig. 1 are arranged in an annular shape as shown in Fig.
On the other hand, the printing wire /2 which is the tip of the armature IO
The fixed part /2' and the tip 72' are curved so that when the tip part /2' projects from the opening of the guide hole /lr, the tips are arranged in two vertical rows. It is assembled.

As shown in FIG. 1, the disk-shaped lid yoke body /3 is screwed and fixed to the yoke part - with a spacer j interposed therebetween by screws 15'.

Briefly explaining the operation of the print head having such a structure, the shear mature IO is attracted to the front end surface of the core 3 by the action of the permanent magnet B against the spring force of the plate spring. Now, a signal is input to the coil ≠, and a magnetomotive force in the opposite direction to the magnetomotive force of the permanent magnet B is generated in the core 3 corresponding to the coil.
By canceling or removing the magnetomotive force of the permanent magnet B, the armature 10 corresponding to the core 3 causes the tip 72' of the printing wire saw to protrude from the printing wire guide 17-/1 due to the spring force of the leaf spring and collide with the printing paper surface (not shown). Then printing is performed.

In the conventional print head configuration described above, the print wire 1
2 printed wire guide /7-/, /7-2°/7-J,
In order to make it easy for each of the /7-4t to pass through a large number of guide holes, it is necessary to individually arrange a plurality of movable body support members 7 and leaf springs on the printing wires / and 2. This has the disadvantage of increasing the number of parts and increasing the size.

In addition, when assembling in units, the movable body support member 7.
Since the dimensional errors of the leaf spring and armature IO are integrated, variations tend to occur in the gap between the armature 10 and the core 3, and the printing pressure on the printing paper surface changes in proportion to approximately the cube of the gap value. Therefore, there was a drawback that the desired print density could not be obtained. Furthermore, there is a drawback that the gaps tend to vary widely between units, resulting in uneven print density.

The present invention eliminates the conventional drawbacks as described above, and the following 1.
This will be explained in detail with reference to the drawings.

FIG. 5 shows a perspective view of the print wire guide in the print head according to an embodiment of the present invention, in which the convex portion of the convex rectangular print wire guide/7 shows the guide support portion 77 of the print wire.
' is provided. A plurality of printing wire guide holes /r are bored in this guide support part, and a printing wire guide support groove /r' is carved in the convex part so as to be connected to the guide holes /r. The shape of this printing wire guide support groove/♂′ is
It is shaped linearly (or tapered) as shown in the figure so that the printing wire can be inserted and mounted smoothly.

Figure 5 shows the tip parts/2 of the plurality of printing wires 7.2 before the tip parts/2' of the plurality of printing wires 7.2 are oiled in the printing wire guide support groove/r' shown in Fig. 5 and inserted into the printing wire guide hole/g. ' is a perspective view of the printing wire/2 arranged in a flat manner.
FIG. 3 is a perspective view of the state after the wire is inserted into the printing wire guide hole /r. Also, Figure R is a rear view of Figure 7 as seen from the rear.
In the drawing, a plurality of printing wire guide holes/♂ are arranged alternately in the upper and lower rows to prevent mutual interference of the printing wires/2 and improve the degree of integration. Also, the diagram is
Figure 3 shows a human-entered sectional view, showing a state in which the tip end 72' of the printing wire/2 passes through the printing wire guide hole l♂ and slightly protrudes from the surface of the printing wire guide/7. .

Next, print wire /2 and print wire guide /7-/, /
7-2. /7-3. The relationship between the fixing structure of /7-41 will be explained. Figure 1O shows the ≠ printed wire guides/
7-/, /7-2. /7-J and /7-Hiroshi are shown in a plan view in which a plurality of printing wires /2 are inserted into the printing wire guide in the order, and in the present invention, the assembly unit shown in Fig. In FIG. 3, which is a perspective view of a conventionally structured bracket assembly, the bracket accommodating portion/! of the printing wire 7.2 is shown. ', and as shown in the plan view of Figure 1/, print wire guides /7-/, /7-2, 17-3. /
7- is inserted into the printing wire guide hole groove /j' and fixed.

The overall structure of the print head for a dot printer of the present invention incorporated in this manner will be described below with reference to the plan view of FIG. 72 and the cross-sectional view of the central portion of FIG. 13. An annular permanent magnet 6 is arranged on a disc-shaped magnetic plate l forming a common magnetic path, and a movable body support member 7, which also forms an annular common magnetic path, is fixed to a permanent magnet AK. N pieces (N=2.3.t
) are also arranged and fixed on the magnetic plate in a concentric circle with the center thereof, and a coil is wound thereon. The bend in the board is 7.2.
As shown in the figure, the central part is made up of a single plate spring formed by a divided piece a divided into N pieces, and N armatures I.
O is fixed. Also, the printing wire/, the fixed part of 2/
2' is fixed to a plate spring, and due to its annular arrangement, the tips 72'' of the printing wires/2 are curved in the middle as shown in FIG. 3 and arranged in two rows at a constant interval. 3 is N armatures, 7/0 rear end/
It is divided into N divided pieces /3n facing θ' to form a magnetic path, and the plate yoke /J and plate spring are fixed to the movable body support member 7 with screws /4Z.

As described above, the print head of the present invention has an armature 1 whose central portion is fixed to each month of N leaf spring segments 98.
A non-printing wire guide/7 having a printing wire guide support part 77' has a printing wire fixed and integrated at the tip of the printing wire/2.
By using this, KN printing wire guide holes 1r and KN printing wires/2 can be inserted simultaneously with high accuracy and ease. Therefore, one plate spring is divided into N pieces at the center and outer periphery, and each divided piece aKN armatures and N printing wires are fixedly integrated.

It is possible to obtain a highly reliable print head for a dot printer that is structurally robust and reduces assembly man-hours.

In addition, in the printing operation, the coil ≠ changes to core 3 according to the input signal.
A magnetomotive force opposite to the magnetomotive force of the permanent magnet B is generated, and the magnetomotive force of the permanent magnet B is canceled or removed, and the armate lO corresponding to the core 3 is moved by the spring force of the plate spring to the tip of the printing wire/2. The portion 7.2' protrudes from the surface of the printing wire guide 17 and collides with a printing paper surface (not shown) to perform printing, as in the conventional case.

[Brief explanation of the drawings] Figures 1 to ≠ show the structure of a print head for a conventional dot printer, in which Figure 1 is a side sectional view, Figure 2 is a partial plan view of the movable body, and Figure 3 is a printing head. A partial perspective view of the wire guide bracket, and the figure ≠ is a front view after the printing wire is assembled. 3 to 13 show the structure of a print head for a dot printer according to an embodiment of the present invention, FIG. 3 is a perspective view of a printing wire guide, and FIG. 6 shows a printing wire attached to the printing wire guide of FIG. 3. Fig. 7 is a perspective view of the arranged printing wire shown in Fig. 1 inserted into the printing wire guide hole, Fig. 70 is a state diagram in which a plurality of printing wires are inserted into the printing wire guide, 1/FIG. 7 is a plan view of the printing wire guide shown in FIG. The figure is a plan view of the print head assembly, No. 73.
The figure is a cross-sectional view of the central part. ri...plate spring, ria...divided piece, IO...armature, 12...printing wire, lλ'...fixed part, 7
2'...Tip, /j...Printing wire bracket,
/! ′...Printed wire guide hole groove, /! '... Bracket housing part, 17... Printing wire guide, /7'
...Printing wire guide support portion, /l...Printing wire guide hole, /1r'...Printing wire guide support groove. Fig. 7 9 Fig. 2 Fig. 3 Fig. 2 Fig. 4 Fig. S ward S 6 Z Spear 7 Leap A Koo 9Z Arrow view A-A cross section Fig. 9 O / Fig. 1 O Fig. 12;! l'i3 figure

Claims (2)

[Claims] (1) In a wire dot print head that is equipped with a printing wire guide and performs printing by reciprocating the tip of the printing wire by penetrating the guide hole of the printing wire guide, the printing wire guide support groove of the printing wire guide support section is connected to the printing wire guide support groove. A print head for a dot printer, characterized in that the print head is connected to a wire guide hole. (2) Insert the printing wire into the printing wire guide hole so that the tips of the printing wire are aligned on one plane while remaining in the guide support groove of the printing wire guide support part, and then insert the printing wire guide into the holding groove of the printing bracket and secure it. A print head for a dot printer characterized by one assembly.