JP2002127473A - Print head for dot printer, dot printer comprising it, and method for manufacturing print head for dot printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a print head for dot printer having a pin member which can be positioned more accurately with respect to a leaf spring. SOLUTION: The print head 2 for dot printer comprises a resiliently deformable leaf spring 6 provided with a pin member 5 at the forward end part 6a thereof, and a mechanism 7 for shifting the forward end part 6a of the leaf spring 6 instantaneously in a specified direction wherein printing is performed dot by dot by impacting a sheet C carriable in the longitudinal direction with the pin member 5 through an ink ribbon 3. The pin member 5 comprises a holder 36 bonded to the leaf spring 6, and a ball 35 held on the holder 36 to touch the ink ribbon 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a print head for a dot printer, a dot printer having the same, and a method of manufacturing a print head for a dot printer.

[0002]

2. Description of the Related Art Conventionally, impact-type printers that perform printing by applying a mechanical impact to paper and an ink ribbon have been widely used. In the impact type, there is a type method where the type is typed as it is,
There is a dot matrix method in which characters, figures, and the like are represented by a set of dots (pixels).

FIG. 11 is a schematic diagram of a dot matrix type printer. In this printer, a print head 2 is arranged via an ink ribbon 3 so as to face a rotatably supported platen 1. Ink ribbon 3
Is supplied from the ink ribbon cassette 4 and the platen 1
Paper C is inserted and supported between the ink ribbon 3 and the ink ribbon 3. The paper C is conveyed in the vertical direction (hereinafter, referred to as “Y direction”) by the rotation of the platen 1. Further, the print head 2 and the ink ribbon cassette 4 can be reciprocated by a stepping motor (not shown) in a direction (hereinafter, referred to as an “X direction”) orthogonal to the sheet conveyance direction.

As shown in FIG. 12, the print head 2 has a plurality of pin members 50 for striking the paper C and the ink ribbon 3, and each of the pin members 50 is an elastically deformable plate. It is fixed to the spring 6. Pin member 50
Is made of a rod-shaped carbide wire, for example, having a diameter of about 0.2
mm and the length are set to about 3 mm. Pin member 50
Is fixed to the leaf spring 6 by, for example, silver brazing.

[0005] As shown in FIG. 13, a plurality of leaf springs 6 extend from one end face 8 a of the flat base member 8, and are arranged in parallel in the X direction. Each pin member 50 in each leaf spring 6 is relatively shifted from the other pin members 50 at a dot pitch corresponding to the printing resolution in the Y direction.

The base portion 8 is supported by a first yoke 11. The first yoke 11 is fastened to the second yoke 12, and the second yoke 12 supports the third yoke 13 via a permanent magnet 24. A plurality of coils 14 corresponding to each leaf spring 6 are wound around the third yoke 13. Further, one end 13 a of the third yoke 13 is arranged to face the leaf spring 6. In the drawing, 28 is a bobbin for winding the coil 14 and 30 is a coil 1
4 is a printed circuit board for passing current, 31 is a connector,
Reference numeral 33 denotes a radiation fin.

According to this configuration, a magnetic circuit is formed by the permanent magnet 24, the second yoke 12, the first yoke 11, the leaf spring 6, and the third yoke 13, and the leaf spring 6 normally It is elastically deflected by the suction force and is in contact with one end 13a of the third yoke 13 or in a state of being separated by a minute interval. In this case, when a current is selectively passed through the coil 14 according to a control signal from the printed circuit board 30, the attractive force of the permanent magnet 24 is canceled out, and the plate spring 6 is resiliently restored by the plate spring 6 due to its elastic return force.
Displace towards the side. Thereby, the pin member 50 is
The sheet C and the ink ribbon 3 are hit, and as a result, the ink of the ink ribbon 3 is attached to the sheet, and printing is performed on the sheet.

The pin members 50 of the leaf spring 6 are shifted at a dot pitch corresponding to the printing resolution in the Y direction as described above.
Assuming that the number of print heads is two, when the print head 2 moves one way in the X direction, 12 dots are printed in the Y direction, thereby improving printing efficiency.

[0009]

By the way, in a printer using the dot matrix method, for example,
Printing is possible at a printing resolution such as 60 dpi (Dot Per Inch) or 180 dpi. Usually, in the X direction, by controlling the movement of the print head 2, printing can be performed at the above printing resolution. On the other hand, in the Y direction, since the pin members 50 are provided shifted according to the dot pitch of the printing resolution, it is necessary to increase the positional accuracy of the pin members 50 to realize the above printing resolution. That is, it is necessary to accurately position the pin member 50 with respect to the leaf spring 6.

In the conventional print head 2, a fine carbide wire is fixed to the leaf spring 6 by brazing as a pin member 50. However, in this method, a fine dot pitch corresponding to a printing resolution is required. However, it is difficult to obtain the positional accuracy of the pin member 50, and there is a problem in workability. Therefore, a lot of work time was spent. In addition, the carbide wire is generally expensive, and the conventional pin member 50 has been a factor in increasing the component cost.

[0011]

DISCLOSURE OF THE INVENTION The present invention has been devised in view of the above circumstances, and provides a print head for a dot printer having a pin member which can be positioned more accurately with respect to a leaf spring. Is the task.
It is another object of the present invention to provide a dot printer provided with the print head for a dot printer and a method for manufacturing the print head for a dot printer.

In order to solve the above problems, the present invention employs the following technical means.

According to a first aspect of the present invention, there is provided a print head for a dot printer, comprising: an elastically deformable leaf spring having a pin member provided at a tip thereof; A print unit for a dot printer, which is configured to perform printing on a dot-by-dot basis by striking a pin member against a vertically conveyable sheet via an ink supply member. The pin member includes a holding table fixed to the leaf spring and a sphere held by the holding table and in contact with the ink supply member. Specifically, a concave portion is formed on the distal end surface of the holding table, and a sphere is fixed to the inner surface of the concave portion. Further, the inner surface of the concave portion is formed in a tapered shape.

According to this structure, the pin member for striking the paper and the ink ribbon is composed of the sphere and the holding table for holding the sphere, and the sphere is fixed to the inner surface of the concave portion formed in the holding table. With this configuration, the position of a sphere that strikes a sheet or the like can be reliably specified. In this case, since the concave portion can be formed relatively accurately at an appropriate position on the distal end surface of the holding table by, for example, a precision machining device or the like, the sphere fixed to the concave portion can also be positioned with high precision. Therefore, the relative position of the sphere with respect to the leaf spring can be set to a desired position, and dots can be formed at accurate positions on the paper.

According to a preferred embodiment of the present invention,
A plurality of leaf springs are arranged in parallel along a direction orthogonal to the paper transport direction, and each recess is provided in the paper transport direction according to the dot pitch of the printing resolution for each leaf spring. It is formed with a quantitative shift.

According to the above configuration, since the concave portion to which the sphere is fixed can be easily formed in an appropriate position, the concave portion can be formed by shifting the concave portion on the tip end surface of the holding table by a predetermined amount for each leaf spring. . Therefore, the spheres fixed to the concave portions can also be arranged by being shifted by a predetermined amount, whereby each sphere can be struck on paper or the like in accordance with the dot pitch of the printing resolution.

According to a second aspect of the present invention, there is provided a print head comprising: an elastically deformable leaf spring having a pin member provided at a tip end thereof; and a shifting means for instantaneously shifting the leaf spring in a predetermined direction. A print head for a dot printer, which is configured to perform printing in dot units by striking a pin member against a sheet that can be transported in the vertical direction via an ink supply member, comprising: The member is fixed to the leaf spring and includes a holding table having a concave portion formed on the distal end surface, and an impact body held in the concave portion of the holding table.
The striking body is characterized in that it has a form in which a part of a sphere is cut off. Specifically, the inner surface of the concave portion is formed in a tapered shape.

According to this configuration, since the impact body is fixed to the inner surface of the concave portion formed in the holding table, the position of the impact body can be reliably specified. Since the impact body is formed by cutting a part of a sphere relatively accurately by, for example, a precision machining device or the like, it is possible to position an impact point for impacting a sheet or the like with high accuracy. it can. Therefore, dots can be formed at accurate positions on the paper.

Further, according to a preferred embodiment of the present invention, a plurality of leaf springs are arranged in parallel along a direction perpendicular to the sheet conveying direction. For each spring, a part thereof is cut off so that the contact portion of the impacting body with the ink supply member is shifted by a predetermined amount in the sheet conveyance direction according to the dot pitch of the printing resolution.

According to this configuration, the contact portion with the ink supply member can be formed by cutting off the impact body. Accordingly, since each plate spring can be shifted by a dot pitch corresponding to the printing resolution, each impact body can be hit against a sheet or the like according to the dot pitch of the printing resolution. Further, since the impact body directly cuts the sphere using, for example, a precision machining device, the position accuracy of the impact point on the impact body can be further improved.

[0021] A dot printer provided by the third aspect of the present invention includes the print head provided by the first aspect of the present invention. In addition, it is possible to obtain the same effects as those of the print head according to the second aspect.

According to a fourth aspect of the present invention, there is provided a method of manufacturing a print head for a dot printer, comprising the steps of: providing a pin member at the tip of an elastically deformable leaf spring; A method of manufacturing a print head for a dot printer configured to perform printing in dot units by displacing and hitting a pin member against a sheet via an ink supply member, the method comprising manufacturing the pin member. In the step, after attaching the holding table to the tip of the leaf spring, forming a recess at a specific position on the tip surface of the holding table,
Fixing a sphere to a concave portion formed on the distal end surface of the holding table.

According to the manufacturing method described above, since the formation of the concave portion can be performed after attaching the holding table to the leaf spring,
For example, when manufacturing print heads having different printing resolutions, manufacturing up to attaching the holding table to the leaf spring can be performed in the same process. Further, since the concave portion can be formed with high precision by, for example, a precision machining device, the mounting accuracy of the holding table to the leaf spring is not particularly required. for that reason,
Production work can be performed efficiently. Further, when manufacturing print heads having different printing resolutions, parts can be used in common, and an increase in parts cost can be suppressed.

In the manufacture of the pin member, a step of attaching a holding table having a concave portion formed on the distal end surface to a distal end portion of the leaf spring, and a step of fixing a sphere to the concave portion formed on the distal end surface of the holding table. To form a contact portion of the sphere with the ink supply member, a step of cutting a part of the sphere into an impact body. Alternatively, instead of attaching the holding table having the concave portion formed on the distal end surface to the distal end portion of the leaf spring, the method includes attaching the holding table to the distal end portion of the leaf spring, and then forming a concave portion on the distal end surface of the holding table. You may do so.

According to the manufacturing method described above, the operation of cutting the sphere can be performed after attaching the holding table to the leaf spring. For example, when manufacturing a print head having a different printing resolution, the holding table is attached to the leaf spring. Production up to mounting can be performed in the same process. Therefore, the manufacturing operation can be performed efficiently.

[0026] Other features and advantages of the present invention will become more apparent from the detailed description given below with reference to the accompanying drawings.

[0027]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be specifically described below with reference to the accompanying drawings. In the following, the configuration of the dot printer will be described with reference to FIG. 11 described with the conventional configuration again.

<First Embodiment> FIG. 1 shows a first embodiment of the present invention.
FIG. 1 is a schematic configuration diagram illustrating an example of a dot printer to which a print head according to an embodiment is applied. In this dot printer, as shown in FIG. 11, a print head 2 is arranged opposite to a rotatably supported platen 1. In the vicinity of the print head 2, an ink ribbon cassette 4 for supplying an ink ribbon 3 is provided so as to surround the print head 2, and the ink ribbon 3 is disposed so as to be interposed between the platen 1 and the print head 2. Paper C is inserted and supported between the platen 1 and the ink ribbon 3, and the paper C is transported in the vertical direction (hereinafter, referred to as “Y direction”) by the rotation of the platen 1. In addition, the print head 2 and the ink ribbon cassette 4 move in a direction perpendicular to the transport direction of the paper C (hereinafter, “X
Direction) is reciprocally movable by a stepping motor (not shown).

The print head 2 has a plurality of leaf springs 6 provided with a plurality of pin members 5 for hitting the paper C and the ink ribbon 3 in dot units, and these leaf springs 6 are instantaneously displaced. And a shifting mechanism 7 for causing the movement.

The leaf spring 6 is made of, for example, SK material and, as shown in FIG. 2, is extended from one end surface 8a of the substantially flat base member 8 so as to be elastically deformable. A plurality (12 in the figure) of leaf springs 6 are provided, and each leaf spring 6 is arranged at equal intervals (for example, at a pitch of about 4.445 mm) with respect to the base portion 8. One end face 8a of the base portion 8 is formed to be slightly inclined, so that the height of the leaf spring 6 is different in the X direction. The base portion 8 has a mounting hole 8
b, 8c are respectively formed.

The shifting mechanism 7 includes a first yoke 11 for supporting the base 8 on which the leaf spring 6 extends, a second yoke 12 for supporting a permanent magnet, and a magnetic And a plurality of coils 14 wound around the third yoke 13 via bobbins 28 corresponding to the respective leaf springs 6.

The first yoke 11 is made of a substantially plate-shaped magnetic material, and is arranged along the Y direction. First yoke 11
Has a recess 16 formed on the surface thereof,
6, a through hole 17 is formed. The leaf spring 6 is formed so that the through hole 17 is formed along the concave portion 16 when the pin member 5 strikes the sheet C or the like.
Are arranged to pass through. The first yoke 11 is fastened to the second yoke 12 by bolts 18 together with the base portion 8.

The second yoke 12 is made of a magnetic material like the first yoke 11, and has a mounting surface 20 extending along the surface of the first yoke 11, and an inclined surface extending obliquely upward from one end of the mounting surface 20. 21, and a horizontal surface portion 22 extending from one end of the inclined surface portion 21 in a direction orthogonal to the mounting surface portion 20. The third yoke 13 is provided on the upper surface of the horizontal surface portion 22 of the second yoke 12 via a permanent magnet 24.

The third yoke 13 is made of a magnetic material similarly to the first and second yokes 11 and 12, and has a flat base 26 and one end surface 26a of the base 26 as shown in FIG. It comprises a plurality of protrusions 27 which extend in a comb shape and correspond to the respective leaf springs 6. The third yoke 13 is arranged such that the lower surface of the base portion 26 contacts the permanent magnet 24 and a part of the tip 27a of the projection 27 can contact the leaf spring 6 described above. The plurality of projections 27 include a plurality of coils 14 corresponding to each leaf spring 6.
Are wound around the bobbins 28, respectively.

The coil 14 has a printed circuit board 30 on both ends of which an electric circuit for supplying a current to the coil 14 is formed.
It is connected to the. A connector 31 for exchanging external signals with a control device (not shown) is provided on the printed circuit board 30.
Are arranged. The printed circuit board 30 includes a spacer 3
The radiating fins 33 are attached via the second fins 2. The radiating fins 33 are for radiating heat accumulated in the coil 14, and a part thereof is adhered to the coil 14.

According to the above configuration, a magnetic circuit is formed by the permanent magnet 24, the second yoke 12, the first yoke 11, the leaf spring 6, and the third yoke 13. That is, in the normal state, the leaf spring 6 causes the third force by the attraction force of the permanent magnet 24.
The plate spring 6 is elastically bent toward the yoke 13, and the back surface of the leaf spring 6 is held in contact with a part of the one end surface 27a of the protrusion 27 or at a predetermined distance (hereinafter, this state is referred to as " Reset state ”).

From a control device (not shown), the printed circuit board 30
When the control signal is sent to the
A current is selectively passed through one of the coils 14. Thereby, in the leaf spring 6 corresponding to the coil 14 through which the current has flowed, the attraction of the permanent magnet 24 by the second yoke 12 is canceled. As a result, the reset state of the leaf spring 6 is released, and the leaf spring 6 is instantaneously moved toward the sheet C by the elastic return force, and strikes the sheet C and the ink ribbon 3. Thus, the ink of the ink ribbon 3 is attached to the sheet C, and printing is performed on the sheet C.

Next, the pin member 5 which is a feature of the present embodiment will be described. The pin member 5 fixed to the distal end 6a of the leaf spring 6 is, as shown in FIG.
And a sphere 35 held by the holding base 36 and in contact with the ink ribbon 3. The holding table 36 is made of an SK material similarly to the leaf spring 6, and has a substantially conical shape with a front end portion notched. The base of the holding base 36 is fixed to the leaf spring 6, and extends in a direction substantially orthogonal to the leaf spring 6.

A substantially conical recess 37 is formed in the tip end surface 36a of the holding table 36. The recess 37 has a tapered inner surface 37a so that the sphere 35 having a predetermined size is easily fixed thereto.
It is set to 120 °. The recess 37 is formed with high precision using, for example, a precision machining device.

The sphere 35 is an inexpensive carbide ball having a material composition of, for example, 94% tungsten carbide and 6% cobalt, and has a diameter of about 0.3 to 0.4 mm, preferably about 0.4 mm. Is used.

The sphere 35 is fixed to a part of the inner surface 37a of the recess 37 of the holding base 36. Since the apex 35a of the sphere 35 serves as an impact point of the pin member 5 against the paper C or the like, at least the apex 35a of the sphere 35 projects from the recess 37 when the sphere 35 is fixed to the recess 37.

As described above, the paper C and the ink ribbon 3
Since the pin member 5 for striking the ball comprises a sphere 35 and a holding base 36 for holding the sphere 35, and the sphere 35 is fixed to the inner surface 37a of the concave portion 37 formed in the holding base 36,
The position of the sphere 35 striking the ink ribbon 3 or the like can be reliably specified. In this case, the tip surface 3 of the holding table 36
In 6a, the concave portion 35 can be formed in a proper position relatively accurately by a precision machining device such as a machining center, so that the spherical body 35 can be positioned with high precision. Therefore, the sphere 3 with respect to the leaf spring 6
5 can be set to a desired position, and dots can be formed at accurate positions on the paper C.

As shown in FIG. 5, the concave portion 37 formed on the tip end surface 36a of the holding table 36 is formed to be shifted by a predetermined amount in the Y direction with respect to the concave portion 37 of the adjacent holding table 36. The predetermined amount corresponds to the dot pitch P of the printing resolution in the Y direction. Therefore, the position of the vertex 35a of the sphere 35 is shifted from the position of the vertex 35a of the adjacent sphere 35 by the dot pitch P in the Y direction.

For example, when the print head 2 is set at 160 dp
i, the dot pitch P is 2
Determined by 5.4 mm (1 inch) / 160 dpi,
It becomes about 0.1588 mm. The concave portion 37 is formed so as to be shifted from the adjacent holding table 36 by about 0.1588 mm in the Y direction. Therefore, the vertex 35a of each sphere 35
Is a vertex 35a of a sphere 35 adjacent in the Y direction,
It will be shifted by a difference of about 0.1588 mm.

As described above, since the concave portion 37 can be formed in an appropriate position relatively easily, each holding base 37
The concave portion 37 can be formed with a high degree of accuracy in the distal end surface 37a. Therefore, the vertex 3 of each sphere 35
5a can be shifted by a predetermined amount for each leaf spring 6, whereby each sphere 35 can be hit against the paper C or the like according to the dot pitch of the printing resolution. Therefore, print quality can be improved.

In addition, instead of the concave portion 37 formed on the tip end surface 36a of the holding base 36, a hemispherical concave portion having a diameter substantially equal to the diameter of the sphere 35 may be formed, or A substantially rectangular concave portion having one side substantially the same as the diameter of the spherical body 35 may be formed. As described above, the shape of the distal end surface 36a of the holding base 36 is not particularly limited as long as the spherical body 35 can be fixed and the vertex 35a of the spherical body 35 can be protruded.

Next, a method of attaching the pin member 5 to the leaf spring 6 and a method of forming the recess 37 will be described. First,
A holding table 36 whose front end surface 36a is not processed is caulked and fixed to the distal end portion 6a of each leaf spring 6. For details, see FIG.
As shown in FIG. 5, the mounting portion 36b formed at the base end of the holding base 36 is inserted into a mounting hole 6b formed in the distal end portion 6a of the leaf spring 6 and penetrating in the thickness direction thereof. By caulking, the holding table 36 is fixed to the leaf spring 6.

Next, a concave portion 37 is formed on the distal end surface 36a of the holding table 36 by a precision machining device such as a machining center. In this case, the concave portion 37 is formed such that the apex 35a of the sphere 35 fixed thereto is the apex 35a of the adjacent sphere 35.
And a dot pitch P corresponding to the printing resolution in the Y direction
It is formed so as to be shifted by an amount.

Specifically, a reference point Q (see FIG. 2) is set on the base portion 8, for example, at the center of the mounting hole 8b.
Based on the reference point Q, for example, the position where the concave portion 37 is formed in the leftmost leaf spring 6 is set, and the concave portion 37 is formed on the distal end surface 36a of the holding base 36 according to the formed position.

Subsequently, the leaf spring 6 on the right side of the leaf spring 6
Of the recess 37 is set. In particular,
As described above, when the printing resolution is 160 dpi, the formation position of each recess 37 is determined by the recess 3 in the adjacent leaf spring 6.
7 and a difference of about 0.1588 mm in the Y direction. Then, a concave portion 37 is formed in the distal end surface 36a of the adjacent holding table 36 accordingly. In this way, the recess 37 is formed so that the formation position is shifted up to the leaf spring 6 at the right end. Note that the formation position of the concave portion 37 in the X direction matches the formation pitch of each leaf spring 6, and the concave portion 37 is formed, for example, every 4.445 mm.

Thereafter, as shown in FIG.
The spheres 35 are placed in the recesses 37, respectively, and the spheres 35 are fixed to the respective holders 36 by using, for example, a method such as resistance welding.

In this way, if the recesses 37 are formed in each holding table 36 so as to be shifted in the Y direction, each sphere 3
5 can be arranged so as to match the dot pitch P according to the printing resolution. Therefore, when the print head 2 is moved one way along the X direction by driving a stepping motor (not shown), 12 dots are printed in the Y direction.

As described above, in the present embodiment, the concave portion 37 to which the sphere 35 is fixed can be easily formed in a proper position by a precision machining device or the like.
The recess 37 can be formed with a high degree of accuracy at the tip end surface 36a of the sixth. Therefore, when the print head 2 is manufactured, for example, at a different print resolution, it is possible to easily cope with the print resolution. For example, when using a print resolution of 180 dpi, the dot pitch is 25.4 mm (1 inch) / 180.
It is determined by dpi and becomes about 0.1411 mm. The vertex 35a of each sphere 35 is the vertex 35 of the adjacent sphere 35
Each recess 37 may be formed so as to deviate from “a” by about 0.1411 mm.

Further, since the concave portion 37 can be formed after the holding table 36 is attached to the leaf spring 6, even if the printing resolution is different, the manufacturing process until the holding table 36 is attached to the leaf spring 6 is the same process. Can be done with Further, the mounting accuracy of the holding table 36 to the leaf spring 6 is not particularly required. Therefore, the manufacturing operation can be performed efficiently. Further, even if the printing resolutions are different, components can be used in common, and an increase in component costs can be suppressed.

In FIG. 2, since each leaf spring 6 extends from the inclined one end surface 8a of the base portion 8, the position of the holding table 36 in the Y direction is substantially shifted.
As long as the area of the distal end surface 36a of each holding table 36 can tolerate the displacement of the concave portion 37 in the Y direction, the one end surface 8a of the base portion 8 may be formed without being inclined. In this case, there is an advantage that molding of the leaf spring 6 alone becomes easy.

<Second Embodiment> FIG. 8 shows a second embodiment of the present invention.
It is sectional drawing which shows the pin member 40 which concerns on embodiment. In the second embodiment, the pin member 40 is fixed to the leaf spring 6 and has a holding base 36 having a concave portion 37 formed on the distal end surface.
And an impact body 41 held in the concave portion 37 of the holding base 36
The impact body 41 has a form in which a part of a sphere is cut off. Specifically, the impact body 41 is formed such that the peripheral surface 41a of the upper hemisphere of the sphere is cut out, and the upper hemisphere has a substantially mountain shape having a curve. And the impact body 41
Near the vertex 41b of each of the impact bodies 4 of the other leaf springs 6
For the purpose of making the heights 1 uniform, they are cut along the horizontal direction to form a cut surface 41c. The cut surface 41c is a contact portion for the ink ribbon 3. The other configuration is substantially the same as the configuration of the first embodiment.

Here, a method of attaching the impact body 41 to the holding table 36 and a method of cutting the impact body 41 will be described. As shown in FIG. 9, a holding table 36 is caulked and fixed to the distal end 6 a of each leaf spring 6. Next, the concave portion 37 is formed on the tip end surface 36a of the holding table 36 by a precision machining device such as a machining center. In this case, unlike the first embodiment, precision in the position where the concave portion 37 is formed is not particularly required. In addition, in the distal end surface 36 a of the holding table 36, the concave portion 3
After forming 7, the holding table 36 may be caulked to the leaf spring 6 and fixed.

Next, a sphere as an impact body 41 is placed in the recess 37, and the sphere is fixed to the holding base 36 by using a method such as resistance welding. In this case, since the sphere is cut in a later step, the sphere has a relatively large diameter as compared with the sphere used in the first embodiment, for example, about 0.6 to 0.3 mm.
It is desirable to use an 8 mm one, preferably about 0.6.

In this state, the surface 4 of the spherical upper hemisphere
As shown in FIG. 8, 1a is cut using a precision machining apparatus equipped with a cutting tool of a diamond grindstone, for example. In this case, the diameter D of the substantially mountain-shaped portion is about 0.2 mm. Thereafter, the vicinity of the apex 41b of the sphere is cut along the horizontal direction in order to make the height of each sphere in each spring 6 uniform, thereby forming a cut surface 41c.

Then, as shown in FIG. 10, the surface 41a of the upper hemisphere of the striking body 41 is cut so as to be shifted by the dot pitch P according to the printing resolution. I do. As a result, each striking body 41 of each leaf spring 6 can strike a sheet C or the like with a shift of a dot pitch corresponding to the printing resolution in the Y direction.

As described above, according to the second embodiment, the sphere can be cut off to form a contact portion with the ink ribbon 3, whereby the dot pitch corresponding to the printing resolution can be set for each leaf spring 6. Can be shifted by minutes. Therefore, each impact body 41 can be shifted for each leaf spring 6 by a dot pitch P according to the printing resolution. Therefore, while having the same effect as the operation and effect in the first embodiment, since the sphere is directly cut using, for example, a precision machining device, the position accuracy of the impact point of the impact body 41 can be further improved.

Of course, the scope of the present invention is not limited to the above embodiment.

(Supplementary Note 1) An elastically deformable leaf spring provided with a pin member at a tip end thereof, and a shifting means for instantaneously shifting the leaf spring in a predetermined direction are provided. A print head for a dot printer, which is configured to perform printing on a dot-by-dot basis by striking a sheet that can be conveyed through an ink supply member,
The print head for a dot printer, wherein the pin member comprises a holding table fixed to the leaf spring and a sphere held by the holding table and in contact with the ink supply member. (Supplementary Note 2) The print head for a dot printer according to Supplementary Note 1, wherein a concave portion is formed on a tip end surface of the holding table, and the sphere is fixed to an inner surface of the concave portion. (Supplementary Note 3) The print head for a dot printer according to Supplementary Note 2, wherein an inner surface of the concave portion is formed in a tapered shape. (Supplementary Note 4) A plurality of the leaf springs are arranged in parallel along a direction perpendicular to the sheet conveying direction,
4. The print head for a dot printer according to claim 2 or 3, wherein each of the recesses is formed to be shifted by a predetermined amount in the sheet conveying direction according to a dot pitch of a printing resolution for each of the leaf springs. (Supplementary note 5) The print head for a dot printer according to any one of Supplementary notes 1 to 4, wherein the diameter of the sphere is 0.3 to 0.4 mm. (Supplementary Note 6) An elastically deformable leaf spring provided with a pin member at a tip end thereof, and a shifting means for shifting the leaf spring in a predetermined direction and instantaneously, the pin member can be transported in a vertical direction. A print head for a dot printer, which is configured to perform printing in dot units by hitting the paper sheet through an ink supply member, wherein the pin member is fixed to the leaf spring, and It is composed of a holding table having a concave portion formed on the surface thereof, and a hit body held in the concave portion of the holding table, wherein the hit body has a form in which a part of a sphere is cut off. , A print head for a dot printer. (Supplementary note 7) The print head for a dot printer according to supplementary note 6, wherein an inner surface of the concave portion is formed in a tapered shape. (Supplementary Note 8) A plurality of the leaf springs are arranged in parallel along a direction perpendicular to the sheet conveying direction,
Each of the impacting bodies is, for each of the leaf springs, a part of the impacting body in such a manner that a contact portion of the impacting body with the ink supply member is shifted by a predetermined amount in the sheet conveying direction according to a dot pitch of printing resolution. 8. The print head for a dot printer according to supplementary note 6 or 7, wherein is cut off. (Supplementary Note 9) The print head for a dot printer according to any one of Supplementary Notes 6 to 8, wherein the diameter of the impact body is 0.6 to 0.8 mm. (Supplementary Note 10) A dot printer comprising the print head according to any one of Supplementary Notes 1 to 7. (Supplementary Note 11) A pin member is provided at the tip of an elastically deformable leaf spring, and this leaf spring is instantaneously displaced in a predetermined direction so that the pin member is impacted on a sheet via an ink supply member. A method of manufacturing a print head for a dot printer configured to perform printing in dot units by hitting, in the production of the pin member, after attaching a holding table to the tip of the leaf spring, Manufacturing a print head for a dot printer, comprising: a step of forming a concave portion at a specific position on the distal end surface of the holding table; and a step of fixing the sphere to the concave portion formed on the distal end surface of the holding table. Method. (Supplementary Note 12) A pin member is provided at the tip of an elastically deformable leaf spring, and this leaf spring is instantaneously displaced in a predetermined direction so that the pin member is impacted on a sheet via an ink supply member. A method of manufacturing a print head for a dot printer configured to perform printing in dot units by hitting, wherein in the manufacture of the pin member, a holding table having a concave portion formed on a tip end surface is provided with the leaf spring. A step of attaching to the tip, a step of fixing the sphere in a concave portion formed on the tip surface of the holding table, and forming a part of the sphere in contact with the ink supply member. A method for manufacturing a print head for a dot printer. (Supplementary Note 13) A pin member is provided at the tip of an elastically deformable leaf spring, and this leaf spring is instantaneously displaced in a predetermined direction, so that the pin member comes into contact with a sheet via an ink supply member. A method of manufacturing a print head for a dot printer configured to perform printing in dot units by hitting, in the production of the pin member, after attaching a holding table to the tip of the leaf spring, A step of forming a concave portion on the tip surface of the holding table, a step of fixing the sphere to the concave portion formed on the tip surface of the holding table, and forming a contact portion of the sphere with the ink supply member, Cutting a part of the sphere. A method for manufacturing a print head for a dot printer.

[0064]

As described above, according to the present invention, the pin member for striking the paper and the ink supply member is composed of the sphere and the holding base for holding the sphere, and the part formed on the holding base. Since the sphere is fixed to the inner surface of the sphere, the position of the sphere striking the ink supply member or the like can be reliably specified. In this case, since the concave portion can be formed at an appropriate position relatively accurately on the tip end surface of the holding table, the sphere can be positioned with high precision. Therefore, the relative position of the sphere with respect to the leaf spring can be set to a desired position, and dots can be formed at accurate positions on the paper.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a print head for a dot printer according to a first embodiment of the present invention.

FIGS. 2A and 2B show a leaf spring and a base, wherein FIG.
(b) is a BB view of (a).

FIG. 3 is a perspective view of a third yoke.

FIG. 4 is a view showing a state in which a sphere is fixed to a holding table.

FIG. 5 is a diagram illustrating a formation position of a concave portion in another holding table.

FIG. 6 is a diagram showing a state in which a holding table is attached to a leaf spring.

FIG. 7 is a perspective view of a sphere and a holding table.

FIG. 8 is a diagram illustrating a sphere and a holding table of a print head according to a second embodiment.

FIG. 9 is a perspective view of a sphere and a holding table.

FIG. 10 is a diagram showing a cutting form of another sphere.

FIG. 11 is a schematic diagram of a conventional dot printer.

FIG. 12 is a schematic configuration diagram of a conventional print head for a dot printer.

13A and 13B show a conventional leaf spring and a base, wherein FIG. 13A is a plan view and FIG. 13B is a view taken along the line bb in FIG. 13A.

[Explanation of symbols]

 2 Print Head 3 Ink Ribbon 5 Pin Member 7 Shift Mechanism 35 Sphere 36 Holder 37 Depression 41 Impact Body C Paper

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kiyoshi Ito 4-1-1, Kamiodanaka, Nakahara-ku, Kawasaki-shi, Kanagawa Prefecture Inside Fujitsu Limited (72) Inventor Masayuki Ito 4-1-1, Kamiodanaka, Nakahara-ku, Kawasaki-shi, Kanagawa No. 1 Fujitsu Co., Ltd. (72) Ryosuke Yabu 4-1-1, Kamiodanaka, Nakahara-ku, Kawasaki-shi, Kanagawa Prefecture 1 Fujitsu Co., Ltd. (72) Inventor Shigenobu Furukawa 4-chome, Kamiodanaka, Nakahara-ku, Kawasaki-shi, Kanagawa No. 1 Inside Fujitsu Limited (72) Koji Miura Inventor 4-1-1, Kamiodanaka, Nakahara-ku, Kawasaki-shi, Kanagawa Prefecture Inside Fujitsu Limited (72) Isao Tazaki 4-1-1, Kamiodanaka, Nakahara-ku, Kawasaki-shi, Kanagawa No. 1 Fujitsu Limited (72) Inventor Keijiro Hamaba 4-1, 1-1 Kamikadanaka, Nakahara-ku, Kawasaki City, Kanagawa Prefecture Fujitsu In the formula company (72) inventor Noboru Kawamura Kawasaki City, Kanagawa Prefecture Nakahara-ku, Kamikodanaka 4 chome No. 1 Fujitsu Limited in the F-term (reference) 2C063 AD02 AD13 AD22 AF03 AF08 AF24 AF28

Claims (11)

[Claims] 1. An elastically deformable leaf spring having a pin member provided at a tip end thereof, and a shifting means for instantaneously shifting the leaf spring in a predetermined direction, and transporting the pin member in a vertical direction. What is claimed is: 1. A print head for a dot printer configured to perform printing on a dot-by-dot basis by striking a possible sheet via an ink supply member, wherein the pin member is fixed to the leaf spring. A print head for a dot printer, comprising: a base; and a sphere held by the holding base and in contact with the ink supply member. 2. The print head for a dot printer according to claim 1, wherein a concave portion is formed on a tip end surface of said holding table, and said sphere is fixed to an inner surface of said concave portion. 3. The print head for a dot printer according to claim 2, wherein an inner surface of said concave portion is formed in a tapered shape. 4. A plurality of the leaf springs are arranged in parallel along a direction perpendicular to the sheet conveying direction, and each of the recesses has a dot pitch of a printing resolution for each of the leaf springs. The print head for a dot printer according to claim 2, wherein the print head is formed so as to be shifted by a predetermined amount in the transport direction of the paper according to the print condition. 5. An elastically deformable leaf spring having a pin member provided at a tip end thereof, and a shifting means for instantaneously shifting the leaf spring in a predetermined direction, and transporting the pin member in a vertical direction. A print head for a dot printer configured to perform printing in dot units by hitting a possible sheet via an ink supply member, wherein the pin member is fixed to the leaf spring, and It is composed of a holding table having a concave portion formed on the distal end surface, and an impact body held in the concave portion of the holding table, wherein the impact body has a form in which a part of a sphere is cut off. Characteristic print head for dot printers. 6. The print head for a dot printer according to claim 5, wherein an inner surface of the concave portion is formed in a tapered shape. 7. A plurality of said leaf springs are arranged in parallel along a direction orthogonal to a sheet conveying direction, and each of said impacting bodies is provided for each of said leaf springs. The dot printer according to claim 5, wherein a part of the body is cut off such that a contact portion of the body with the ink supply member is shifted by a predetermined amount in a sheet conveyance direction according to a dot pitch of printing resolution. Print head. 8. A dot printer comprising the print head according to claim 1. 9. A pin member is provided at the tip of an elastically deformable leaf spring, and this leaf spring is instantaneously displaced in a predetermined direction so that the pin member is moved to a sheet via an ink supply member. A method for manufacturing a print head for a dot printer configured to perform printing in dot units by hitting, in the manufacture of the pin member, after attaching a holding table to the tip of the leaf spring, A step of forming a concave portion at a specific position on the distal end surface of the holding table, and a step of fixing the sphere to the concave portion formed on the distal end surface of the holding table, Production method. 10. A pin member is provided at the tip of an elastically deformable leaf spring, and the leaf spring is instantaneously displaced in a predetermined direction to move the pin member to a sheet via an ink supply member. A method of manufacturing a print head for a dot printer configured to perform printing in dot units by hitting, wherein in the manufacture of the pin member, the holding table having a concave portion formed on a front end surface thereof includes a leaf spring. A step of attaching the spherical body to a concave portion formed on the distal end surface of the holding table; and a part of the spherical body to form a contact portion of the spherical body with the ink supply member. And a method for manufacturing a print head for a dot printer. 11. A pin member is provided at the tip of an elastically deformable leaf spring, and this leaf spring is instantaneously displaced in a predetermined direction to move the pin member to a sheet via an ink supply member. A method for manufacturing a print head for a dot printer configured to perform printing in dot units by hitting, in the manufacture of the pin member, after attaching a holding table to the tip of the leaf spring, A step of forming a concave portion on the distal end surface of the holding table, a step of fixing the spherical body to the concave portion formed on the distal end surface of the holding table, and forming a contact portion of the spherical body with the ink supply member. And cutting a part of the sphere. A method for manufacturing a print head for a dot printer.