JPH058382A - Type wheel - Google Patents

Abstract

PURPOSE:To make compressed amounts of respective types substantially equal to perform printing with legible large-size types by a method wherein in a type wheel used for a printer, the two or more character widths of each type are set to be changed in accordance with the magnitude of a compressed amount when the type is pressed by a pressing member. CONSTITUTION:A type wheel 1 made of an elastic material is provided with a plurality of types, projections provided on the inner peripheral part correspondingly to the types, and connecting parts connecting these components. The type wheel 1 is held by a holding body 2 having a center shaft part 2a for rotating the type wheel 1 and pressed by a pressing member 3 moving in arrow directions 6. Furthermore, a platen 4 forming a printing surface and printing paper 5 are disposed so as to be opposed to the type wheel 1. In this construction, the type wheel 1 can change a character width of a type 1a of a large compressed amount, such as '-', from L2 to L1 to a great extent. In this manner, a compressed amount of a type of a large compressed amount is made substantially equal to that of a type 1b of a small compressed amount, such as '8'.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a type wheel used in a type wheel printer.

[0002]

2. Description of the Related Art Conventionally, this type of technique is disclosed in Japanese Patent Laid-Open No. 57-18.
2472 and the Japanese Patent Laid-Open No. 58-1127.
As in the conventional example shown in Japanese Patent Publication No. 81-81, it is used in a printer of a type in which printing is performed by pressing a print character for printing from the inside of a print wheel having a plurality of prints by a pressing member to push it out. It is widely used as a type wheel in the field of small printers.

[0003]

However, in the above-mentioned prior art, it is taken into consideration that the pressing force per unit area caused by the difference in the compressed amount for each type caused by the difference in the type area depending on the type of type becomes excessive. The printing mechanism does not work, and all characters are pressed uniformly with the same pressing force, so the amount of compression differs for each character. For this reason, there is a drawback that the thickness of the lines that make up a character varies depending on the printed characters or the line thickness changes even within a single character, reducing the readability and beauty of the print. Was there.

Further, if the pressing force per unit area becomes excessive, it causes a problem that the characters are buckled and the print is deformed, so that the strength of the pressing force is limited by the small area portion. . This drawback prevents the strengthening of the pressing force required in order to realize the demand for increasing the size of printing characters, which has been increasing in the field of small printers in recent years, and is a major factor in realizing a small printer capable of printing large characters. It has become a challenge.

Further, the elasticity of the character ring itself, that is, the tensile force received from the adjacent character and the connecting portion is used to return the character type pushed out by the pressing member for printing to the original position after the completion of printing. When printing, a character adjacent to the type to be printed is also pulled out toward the surface of the paper to be printed, and when printing a type with a large amount of compression, the gap between the adjacent type and the printing paper becomes smaller and the adjacent type It has a drawback that the printing paper and the printing paper easily come into contact with each other.

FIG. 4 shows a conventional printer.
When the character width of a type with a large amount of compression such as "-" is set to the same character width L2 as the character width of a type with a small amount of compression such as "8", a character area with a large amount of compression has a unit area Since the pressing force per hit becomes large, the deformation of the printed characters becomes large and the printed character width becomes thick. In addition, the distance C3 between the adjacent printing characters and the printing paper also becomes small, and printing stains due to contact are likely to occur.

The present invention has been made in order to solve such a drawback, and its object is to make the thickness of characters constant without increasing the size of the printer and adding special mechanical parts. It is an object of the present invention to provide a small-sized printer capable of printing large-sized characters that are easy to read without deformation and do not cause stains on the printing paper surface.

[0008]

In order to solve the above problems, the type wheel of the present invention is characterized in that the characters of the type characters have at least two or more different character widths.

[0009]

According to the above construction of the present invention, the character width of a character having a large compressed amount, for example, "-", is made larger than that of a character having a small compressed amount, for example, "8". Since the compressed amount at the time of printing can be made substantially equal, it is possible to perform printing with a uniform thickness and suppress the deformation of characters.

Further, since the amount of compression of the adjacent characters is reduced toward the printing paper by reducing the compressed amount, the distance between the adjacent characters and the printing paper can be kept large, and the printing paper due to the contact between the adjacent characters can be kept. It is possible to suppress the generation of dirt.

[0011]

1 is a sectional view of a printing mechanism of a printer according to an embodiment of the present invention.

Reference numeral 1 is a type ring made of an elastic material composed of a plurality of types of characters, inner peripheral projections corresponding to the characters, and a connecting portion connecting them. 1a is a type with a large compressed amount such as "-", and 1b is a type with a small compressed amount such as "8". According to a feature of the present invention, a character having a large compressed amount has a character width changed from L2 to L1 and the character width is increased to make the compressed amount substantially equal. Reference numeral 2 denotes a cylindrical holder for holding a printing wheel, which is composed of a portion for holding the printing wheel shown by 2 and a central shaft portion 2a for rotating the printing wheel for selecting a printing type for printing. It is rotated by a mechanism for rotating a holder (not shown), and a character for printing is also selected by a mechanism (not shown) for detecting the type of a character wheel, so that a character to be printed is located at a position facing the pressing member 3. Further, 3 is a pressing member that moves in the direction of arrow 6 by a drive mechanism (not shown) and presses the type wheel, 4 is a platen that forms the printing surface, and 5 is printing paper.

FIG. 2 is a sectional view showing a state in which characters are printed by the printer in the embodiment shown in FIG.

According to the present invention, as shown in FIG. 2, a character having a large amount of compression such as "-", which has a large pressing force per unit area, has a large character width such as L1 to prevent compression. Since the strength is equivalent to a character width L2 with a small pressing force per unit area, for example, the character width L2 of "8", the compressed amount can be made almost equal, and the distance C between the adjacent character and the printing paper
2 can also be secured in the same manner as when printing a large typeface. Further, since the deformation of the printed characters can be suppressed to be small, it is possible to obtain a print with a uniform line thickness.

According to the present invention, the character width is changed for each character to make the amount of compression substantially equal. However, in one character as shown in FIG. For example, in the case of "7", it is possible to make the upper and lower compressed amounts substantially equal by changing the character width from L2 to L3.

[0016]

As described above, according to the present invention, it is possible to add a special mechanical component without enlarging the printer shape by a simple structure in which the compressed amount is made equal by the character width. It is possible to obtain a great effect that it is possible to realize a small-sized printer capable of printing a large readable character in which the thickness of the character is constant, there is no deformation, and the printing paper surface does not become dirty.

[Brief description of drawings]

FIG. 1 is a sectional view of a printing mechanism showing an embodiment of the present invention.

FIG. 2 is a sectional view showing a printing state in the printing mechanism of the embodiment of the present invention.

FIG. 3 is a plan view of a print type showing an embodiment of the present invention.

FIG. 4 is a sectional view showing a printing state according to an example of a conventional printing mechanism.

[Explanation of symbols]

1 type ring 1a type (type with large compressed amount like "-") 1b type (type with small amount compressed like "8") 1c type (compressed at upper and lower side like "7") 2) Holding body 2a Holding body rotating shaft section 3 Pressing member 4 Platen 5 Printing paper 6 Pressing member moving direction C2 Gap between the printing character and the printing paper adjacent to the printing character C3 The printing character adjacent to the printing character Gap with printing paper L1 Character width of printed characters (wide width) L2 Character width of printed characters (small width) L3 Character width of printed characters (medium width)

Claims (1)

Claim: What is claimed is: 1. A printer having a plurality of characters on an outer peripheral surface and a protrusion corresponding to the character on an inner peripheral surface, which is used in a printer for printing by pressing a character from the inside by a pressing member. In a ring-shaped print ring made of an elastic material, which is composed of a connecting portion that connects the adjacent print characters and the protrusions, the print characters have at least two different character widths. ring.