JPS62278042A - Daisy wheel and printer - Google Patents

Abstract

PURPOSE:To enable printing of a large type by means of a small daisy wheel, by providing a portion extending toward the base of an adjoining type to a base having an underlined type while forming a recess along the extended portion in the base of a type adjoining to the underline. CONSTITUTION:Since a base section 17 has an underlined type 20, it has a extended portion 17b on the side. A base section 19 is positioned adjacently to the base section 17, and a recess 19b is formed along the profile of the extended portion 17b at a portion close to the extended portion 17b. A groove 10 is formed along an operation locus at a portion of a print hammer 8 close to the extended portion 17b at the base section 17 of the underline. Consequently, when the base section 19 adjoining to the base section of the underline is operated for printing, interference between the base sections 17 and 19 and between the base section 17 and the print hammer 8 can be avoided.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention Field of Industrial Application The present invention relates to a printing device used in typewriters and the like.

2. Description of the Related Art There has been a demand for downsizing of printing devices using daisy wheels.

Conventional printing devices generally have a printing hammer with a rectangular cross section with a groove at the tip, and the daisy wheel that is struck by the printing hammer has spokes arranged radially at equal intervals on the front side of the base of the tip. It has typefaces, and a protrusion that engages with the groove at the tip of the printing hammer is formed on the back side of the typefaces on the base.

In commonly used daisy wheels, if you try to make the daisy wheel smaller, the space between the base parts becomes narrower because the type size and number of type are fixed. The distance between the base part and the head part is between the base part of the underline type which is located closest to the center and has approximately the same width as the widest type, and the space between the base part of the type adjacent to both sides. −
It becomes narrowest between the

Problems to be Solved by the Invention However, in the conventional configuration described above, when trying to reduce the size of the daisy wheel while keeping the size of the type constant, the base of the underlined type and the base of the adjacent type However, if the impact position shifts due to variations or vibration, there is a risk that the base parts will come into contact with each other and print quality will deteriorate, making the design difficult. Was.

Means for Solving the Problems The present invention provides a method in which a base having underlined type has an overhanging portion extending toward the base of an adjacent type,
A depression is formed in the base of the typeface next to the underline along the overhang.

Effect With the above configuration, even with a daisy wheel of the same diameter, it is possible to widen the minimum width between the underline and the base of the adjacent type, so even if the diameter of the daisy wheel is smaller, the minimum width between the base and the Conventionally, the risk of interference of the base part does not increase.

Embodiment FIG. 1 is a perspective view of a printing device according to an embodiment of the present invention, where 16 indicates the entire daisy wheel, 3 indicates spokes arranged radially, and 2 indicates a base portion disposed at the tips of spokes 3. , 20 are printed characters having underlined capitals, and 17 is the base portion of the printed characters 20.

The daisy wheel 16 will be explained in more detail using FIG. 2.

FIG. 2 is a perspective view of the main parts of the daisy wheel 16.
Reference numeral 7 designates a base portion of an underline type character 20 having a convex portion 17a that engages with the printing hammer 15 on the back side, and the base portion 17 has protrusions 17b and 17c on the side because it has an underline type character 20. are doing. 11
is located adjacent to the base portion 17 and has a convex portion 11a1 that engages with the printing hammer 15 on the back surface and a recess llc along the overhang 17c; 19 is a base portion of the base portion 17;
The base portion has a convex portion 19a on the back surface that engages with the printing hammer 15, and a recess 19b that follows the shape of the overhang 17b is formed in a portion adjacent to the overhang 17b.

In FIG. 1, 5 is a gear directly connected to the daisy wheel 16, 4 is a type selection motor that drives the gear 5, and 15
is a printing hammer that has grooves 10 on both sides and hits the base part 2 from the back side, and a groove (not shown in the figure) that engages with the base part 2 is formed at the tip of the printing hammer 15. ing. 6 is a hammer solenoid that drives the printing hammer 15.

FIG. 3 is a perspective view of the main parts of the printing device in this embodiment, and the dashed line indicates the printing hammer 8 in contact with the base portion 19. Since the printing hammer 8 has a groove 10 formed in the vicinity of the protrusion 17c of the underline base portion 17 along the operating trajectory, it is difficult to print the print on the base portion 19 adjacent to the underline base portion. Even if the printing is performed, interference between the base portions 17 and the base portions 19 and between the base portions 17 and the mark = 5- character hammer 8 can be avoided, so that normal printing can be performed.

The operation of the printing device according to this embodiment configured as described above will be described below.

First, the type selection motor 4 rotates, and after the type 2 is selected, the hammer solenoid 6 is energized, the number 1 hammer 7 rotates, and hits the base portion 2 of the daisy wheel 3 from the back side. The base portion 2 is pressed onto printing paper (not shown in the figure) via an ink ribbon (not shown in the figure) to perform printing.

Effects of the Invention In the present invention, a base having underlined type has an overhanging portion extending toward the base of an adjacent type,
A recess is formed in the base of the type next to the underline along the overhang, and even with a daisy wheel of the same diameter, the minimum width between the underline and the base of the type adjacent to it can be widened. Therefore, even if the diameter of the wheel is made smaller, the risk of interference between the base parts does not increase in the past.

Furthermore, the present invention includes a printing hammer with grooves formed on the side surface to avoid the overhang formed on the base of the type, so even when printing is performed using the daisy wheel of the present invention, the printing hammer does not form an underline. There is less risk of interference with the overhang of the typeface, and large type can be printed with a small daisy wheel.

[Brief explanation of drawings]

FIG. 1 shows a printing device in one embodiment of the present invention. 8...Printing hammer, 10...groove, 11...Base part, 11c... hollow, 16...Dizzy wheel, I7...Base part,' 17b, 17c... overhang, ]9...Base part, 19b...dent, 20...Print Name of agent: Patent attorney Toshio Nakao 1 idiot @ 1 diagram

Claims (2)

[Claims] (1) In a daisy wheel comprising a plurality of spokes arranged radially, a base part attached to the tips of the spokes, and printed characters formed on the front side of the base part, the base has underlined printed characters. A daisy wheel characterized in that it has an overhang extending toward the base of an adjacent type character, and a depression along the overhang is formed in the base of the type character adjacent to the underline. (2) A printing device characterized in that it is equipped with a printing hammer having a groove formed on the side surface to avoid an overhanging portion formed in the base of a type character and protruding toward an adjacent type character.