JPH05338124A - Type wheel and printer - Google Patents

Abstract

PURPOSE:To ensure that the size of a type part is enlarged without changing the diameter and width of a type wheel, and a type section part is prevented from coming in contact with a printing sheet even when in the enlargement mode by providing the type part convex characters, digital numbers and symbols formed on the outer surface, and the type section part in which a corresponding hammer impact part is arranged internally and its connecting part. CONSTITUTION:The height H of each type section part 51 is 3.2mm or larger than the height of a conventional type section part of 2.2mm. Thus a type wheel consisting of larger types is obtained without changing an interval at which types are arranged. Next, the section part 51 is arranged inside a radius R and part of a type part 51a is formed on a connecting part 13. Therefore, the type is 3.2mm high compared to the conventional height of 2.2mm, and further, the type part is enlarged in size simultaneously due to the stretching of the connecting part 13 following a printing action. In addition, a distance between the surface of a type to a base bottom position is amplified, because the type part of a lower area 51T has the base bottom part formed at a lower level. Consequently, an adequate distance is maintained with the surface of a printing sheet, so that the printing sheet on a specific type section part is prevented from becoming contaminated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a small print wheel printer mounted on an electronic desk-top computer or the like, and more particularly to a structure of a print wheel made of an elastic material used therein.

[0002]

2. Description of the Related Art For example, some electronic desk top computers are equipped with a small print wheel type serial printer as shown in FIG. This type wheel serial printer is shown in FIG. 14 and FIG.
0, a hammer (pressing member) 40, and a carriage 42 having an ink roll 41 are provided, and printing is performed while sequentially carrying the digits from the lower digit. As shown in FIG. 15, each of the type wheels 10, 20, 30 has a plurality of rectangular type section portions 11 on its outer surface, and has a hammer-impacted portion 12 against which a hammer 40 abuts on its inner surface.
Further, a constricted portion 14 is formed inside the connecting portion 13 between the adjacent character type section portions 11 and 11 to engage the rotation preventing portion 43a of the character wheel holding body 43. On the other hand, positioning portions 43b that contact with a limited area are formed at the four corners of each type section 11 in the type wheel holder 43. During the printing operation, the hammer 40 moves the arrow A in FIG.
Since it rotates in the direction, the hammer tip 40a shown in FIG.
Collide with the collided portion 12 of the type section 11 facing the platen 44, the type section 11 is elastically deformed and pushed out, and the type portion 11a of the type section 11 presses against the printing paper 45.

[0003]

In such a type wheel printer, there is a strong demand for increasing the size of the type portion and increasing the size of the printed characters without changing the width and diameter of the type wheel. For this purpose, it is necessary to make the type section connecting part close to the outer diameter part of the type wheel, to enlarge the type section, and to form the type there. However, when the type section connecting portion is brought close to the outer diameter portion of the type wheel and the type becomes large, the type section also becomes large, and in the printing operation by the hammer 40 of the printer, the printing stroke of the hammer 40 is not a constant length. Since it also collides with the type section 11 of the type with substantially the same impact force, the extrusion length is not uniform, and the degree of compression of the type varies depending on the value of the printing area for each type. The distance between the copy and the printing paper surface varies. For example, in a print part with a small printing area such as minus "-", ",", ".", "1", etc., the amount of compression is large, and the distance between the print paper surface and the print section is close, and Even in printed characters, the distance from the printing paper surface varies depending on the local area, and the printing character section part comes into contact with the printing paper surface, causing printing stains.

Further, the impact force (pressing force) of the hammer 40 in this type of character wheel type printer needs to be particularly carefully set in order to improve the printing quality. If the pressing force is too small, the print quality of a large print area is poor, and if the pressing force is too large, the print area of the print area with a small print area buckles and the print deformation occurs, and the print section is printed on the print surface. Get closer. However, when the print size becomes large, the print deformation of the print part with a small print area becomes apparent, and the print quality deteriorates as the size of the print part increases.

Further, in the printing operation, depending on the shape of the type portion of the hammer tip portion 40a and the type section portion 11,
There is a bias in the compression of print characters, and the print section itself tilts. As shown in FIG. 23, for example, "1", ",", ".", Etc., in which the print characters are located substantially in the center, or "7" and "4" in which the print characters are biased to one side, are biased in pressing the print characters. When it occurs, the print section itself cannot resist the inclination, and the distance between the print base of the print section (printing surface of the print section and the print surface) differs from G5 to G6, making contact with the print surface. I will end up.

Therefore, the first object of the present invention is to increase the size of the type portion without changing the diameter or width of the type wheel. Second
It is an object of the present invention to provide a type ring having a structure capable of suppressing contact between the type section and the printing paper even when the size of the type portion is increased.

[0007]

In order to solve the above problems, according to the present invention, a letter ring, a numeral or a symbol is formed on the outer surface of a letter ring made of an elastic material in which a plurality of letter section sections are arranged in a single ring shape. It has a type part formed in a convex shape, a type section part where the hammer hit part corresponding to the type part is arranged on the inner surface, and a connecting part that connects the type section part, and one or more type parts are the bottom Is arranged within the outer diameter of the connecting portion. In addition, the type section is a number "7" or "1" or a letter "T" or a symbol "."
Alternatively, it is characterized by having a type part representing "," or "=" or "-" or "+".

[0008]

As described above, the bottom surface of one or more of the plurality of character section portions is arranged within the outer diameter of the connecting portion, so that the character portion of the particular character section portion is covered. Even if the amount of compression is large, it is possible to move the type section section away from the printing paper surface, or to make the distance between other printing portions and the printing paper surface equal. Further, when this type section section has an adjacent type, it is possible to suppress contact with the printing paper.

As a specific application example of the present invention, in a type section having a variation in printing area per unit area in a type section, a type section in a portion of the type section having a small printing area per unit area is used. The part is located at the bottom of the connecting part, and the type is formed there. Due to the presence of a low print section in that area, the distance from the print surface to the print bottom can be increased, and the amount of elastic deformation possible compression can be increased, so the print bottom (print base surface) to the print paper can be increased. To increase the distance to
The print quality can be improved. In particular, even if the pressing force during printing operation is increased, it is possible to plan the equalization of the distance to the printing paper, so it is possible to adopt large type characters that require an increased pressing force compared to the past. is there.

[0010]

Embodiments of the present invention will now be described with reference to the accompanying drawings. (First Embodiment) FIG. 1 is a side view showing a type wheel according to a first embodiment of the present invention, and FIG. 2 is a side view showing a type section section of the same type ring. Fig. 3 is a front view showing the type section of the same type number "7", and Fig. 4 is the same type number "7".
It is a perspective view showing a type section of. This type ring 5
In the same manner as in the conventional case 0, 14 rectangular type section sections 51 are arranged in a single ring shape, and are made of an elastic material. On the inner surface of each type section 51, there is a hammer hit part 12 against which a hammer hits. Further, a constricted portion 14 is formed inside the connecting portion 13 between the adjacent character type section portions 51, 51. The width W of the type portion 51a formed on each type section portion 51 of the type wheel 50
As shown in FIG. 3, the thickness is, for example, 1.8 mm so that it can be used by being directly fitted to the type wheel holder of the conventional type wheel printer. On the other hand, each type section 5
The height H of 1 is, for example, 3.2 mm, which is larger than the conventional product having a height of 2.2 mm.
This is to obtain a type ring having a large type size without changing the arrangement interval of the type. The line width of the printed characters is 0.3 mm. The height of the protrusions of the printed characters is 0.6 mm. The radius R of the character ring connecting portion 13 is about 6.5 mm.
The type section 51 is arranged inside the radius R, and a part of the type section 51 a is formed on the connecting section 13. As a result, the print height H can be increased from the conventional 2.2 mm to 3.2 mm, and since the connecting portion 13 is extended by the printing operation, the print portion is also enlarged.

In FIG. 3, in particular, the structure of the type section section such as "7" or "T" is made different from that of the other type section sections. In the character portion 51a of "7" shown in FIG. 4, Δh is lower than Δh from the connecting portion 13.
The type portion 51a is formed up to the high surface of h1. The base having a lower Δh occupies more than half of the print section. In this way, since the bottom part of the lower region 51 _T is substantially lower at the base part (the skirt part), even if the contact density of the printed area on the surface is low, the character part is printed in the compression process by the impact force of the hammer. A large distance can be taken from the surface to the base part. As a result, even if the amount of compression is large, the distance from the printing paper surface can be secured, so that the printing paper can be prevented from being contaminated at a specific type section, and it is possible to apply a larger pressing force than before. .. This makes it possible to increase the size of printed characters without impairing the print quality. Note that this example is not limited to the number "7", but can be applied to a type portion representing the number "1", the letter "T", and the like.

(Second Embodiment) FIG. 5 is a perspective view showing a type section section of a type wheel according to a second embodiment of the present invention, and FIG. 6 is a side view showing the same type section section. The type section 61 has a type portion 61a of the symbol ".", And the type portion 61a is formed from the base portion lower by Δh than the connecting portion 13 to the surface of higher Δh1. Further, the base portion having a lower Δh occupies more than half of the type section section, and the type section 61a is formed substantially at the center of the type section. As a result,
Even if the contact density of the printed area on the surface is low, the distance from the print surface to the base part can be increased from G2 to G1 of the conventional print section in the compression process by the impact force of the hammer, as shown in Since the distance from the printing paper surface can be secured even if the amount is large, the printing paper can be prevented from being contaminated at a specific type section, and a larger pressing force can be applied as compared with the conventional case. This makes it possible to increase the size of printed characters without impairing the print quality. This example is not limited to the character ".", But the characters "-", "=",
It can also be applied to the print part that represents "+".

(Third Embodiment) FIG. 8 is a perspective view showing a type section section of a type wheel according to a third embodiment of the present invention, and FIG. 9 is a side view showing the same type section section. The type section 71 has a type portion 71a of the symbol “,”, and the type portion 71a is lower than the connecting portion 13 by Δh4 from the base portion by Δh5.
Is formed up to the surface of the printed character section 71, and is displaced from the center of the type section 71. Further, a base portion having a lower Δh4 is provided on the lower contact density side of the printed area on the surface. As a result,
When the contact density of the printing area on the surface is low and the center of the hammer colliding part and the center of the type part are offset as shown in Fig. 4, when the type part is pressed against the printing paper during the printing operation, As shown in Fig. 10, the compression amount of the type is different in the compression process by the impact force of the hammer, and the type section without the type can increase the distance from the surface to the base part from G4 to G3 of the conventional type. Since the distance from the printing paper surface can be secured even if the amount of compression is large, the printing paper can be prevented from being contaminated at a specific type section, and a larger pressing force can be applied as compared with the conventional case. This makes it possible to increase the size of printed characters without impairing the print quality.

(Fourth Embodiment) FIG. 11 is a perspective view showing a character section section of a character wheel according to a fourth embodiment of the present invention, FIG.
2 is a sectional view showing a state of being cut along the line D-D in FIG. 11. The type section 81 has a type 81a having a numeral "1". In this way, the heights of the bases of the print section on the left and right of the print section are made different from each other by Δj because it is formed in consideration of the case where the compressed amount of the print section 71a of the print section 71 is unbalanced. Is.

By the way, in the type wheel printer,
Depending on the type design, the type may be shifted left or right or up or down, or the letters may be tilted and placed in the type section. In this case, an imbalance occurs in the compression amount of the type section. That is, the hammer tip 40a always presses the type section entirely, but when the type section is formed at a position displaced to the left or right of the type section, the left and right compression amounts are different. In this situation, typefaces such as the numbers “1” and “7”,
In the case where the type part has the left-right asymmetrical type part of the type section, such as the numeral “4” and the letters “L”, “J”, and “F”, the type section is likely to come into contact with the printing paper surface. However, in this example, since a step of ΔJ is provided at the base of the type section of the type section, a large pressing force is required, especially for a type wheel that uses a large type, so that dirt is caused. However, since it is possible to suppress the escape amount of the type section when printing is compressed, stains can be prevented. It should be noted that the numbers, letters, etc. in each of the above-mentioned embodiments are merely examples, and the type portion can be constituted by the type base portion having an appropriate height for the shape of the type used.

[0016]

As described above, according to the present invention, the bottom surface of one or more of the plurality of character section portions of the character wheel is arranged within the outer diameter of the connecting portion. It has the following effects.

That is, when printing a character portion in a specific character section portion due to a difference in height at the character base portion of the character section portion, a distance between the character base portion and the printing paper surface can be secured. In addition, by configuring the print part with a print base that has an appropriate height for the print shape, it is possible to prevent contact with the printing paper surface, enabling a print design that gives the print part freedom in up, down, left, and right directions. .. In particular, since it is possible to prevent print stains even if the pressing force during the printing operation is increased, it is possible to employ a large-sized type which requires an increased pressing force as compared with the prior art.

[Brief description of drawings]

FIG. 1 is a side view showing a type wheel according to a first embodiment of the present invention.

FIG. 2 is a side view showing a type section section of a type wheel according to the first embodiment of the present invention.

FIG. 3 is a front view showing a type section section of a number “7” of the same type ring.

FIG. 4 is a perspective view showing a type section section of a number “7” of the same type ring.

FIG. 5 is a perspective view showing a type section of a symbol “.” In a type wheel according to a second embodiment of the present invention.

FIG. 6 is a side view showing the type section section of the symbol “.” Of the same type ring.

FIG. 7 is a side view showing a mode of using the same type character ring.

FIG. 8 is a perspective view showing a type section section of a symbol “,” in a type wheel according to a third embodiment of the present invention.

FIG. 9 is a side view showing a type section portion of the same type ring symbol “,”.

FIG. 10 is a side view showing a mode of using the same type character ring.

FIG. 11 is a perspective view showing a type section of a number “1” of a type ring according to a fourth embodiment of the present invention.

12 is a cross-sectional view showing a state of cutting along line D-D in FIG.

FIG. 13 is a perspective view showing an overall configuration of a type wheel printer.

FIG. 14 is a perspective view showing a carriage used in the same type wheel printer.

FIG. 15 is an exploded perspective view showing a type wheel and a type wheel holder mounted on the carriage.

FIG. 16 is a side view showing the relationship between the same type ring, platen, and hammer.

FIG. 17 is a cross-sectional view showing a state of a gap between a type section section and printing paper in the same type ring.

[Explanation of symbols]

 10, 20, 30, 50 ... Type wheel 11, 51, 61, 71, 81 ... Type section section 11, 51a, 61a, 71a, 81a ... Type section 12 ... Hammer collided section 13・ ・ ・ Connecting part 14 ・ ・ ・ Narrowing part 40 ・ ・ ・ hammer 40 a ・ ・ ・ hammer tip part 41 ・ ・ ・ Ink roll 42 ・ ・ ・ Carriage 43 ・ ・ ・ Type wheel holder 43 a ・ ・ ・ Rotation prevention part 44 ... Platen

Claims (3)

[Claims] 1. A type ring made of an elastic material in which a plurality of type section sections are arranged in a single-striped ring shape. A type portion having letters, numbers, or symbols convexly formed on the outer surface and the type portion on the inner surface are provided. A type section in which the hammer colliding part is arranged, and a connecting section connecting the type section to each other. One or more of the type sections have a bottom surface arranged within an outer diameter of the connecting section. A type ring characterized by that. 2. The print type section portion according to claim 2, wherein the number "7" or "1" or the letter "T" or the symbol "." Or "," or "=" or "-" or "+" is used. A character ring having a character part to represent. 3. A printer using the type wheel defined in claim 1.