JPS5890963A - Type head - Google Patents

Abstract

PURPOSE:To enable a specified type to be easily replaced, by providing positioning holes or projections at the tips of some of arm parts, in a printing head wherein a type is provided at one end of each of a plurality of arm parts extending radially from a central part. CONSTITUTION:The type 5 is provided at the tip part of each of a plurality of the arm parts 4 extending radially from the central part, some of the arm parts 4a are provided respectively with two positioning holes 6 at their tip parts. A small bolck 7 is provided with a specified type 5a on one side thereof and two projections 9 on the other side. When using the small block 7, the projections 9 of the block 7 are press-fitted or adhered into the positioning holes 6. Accordingly, a small number of the types 5a which are frequently used and are heavily consumed are placed in the small block 7, and only the block 7 is replaced when the type 5a is consumed, whereby the useful life of the type head as a whole can be prolonged.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a print head used in a matrix serial printer, and more particularly to a so-called cup-shaped or daisy-shaped print head in which characters are formed at one end of a plurality of arms extending radially from the center. Regarding.

Conventionally, the print head of this building was made using methods such as integral molding or double injection molding, but in either case, when the print head was formed, all the arms and all the type are integrated. Therefore, even if only one symbol among the printed cents included in one print head is different, it is necessary to separately manage the print head as a whole as being different. If you want to print a trade name unique to a certain user, you must create a print head that matches the trade name for all print heads of the typeface used by that user.

The present invention provides a print head containing a special symbol by using a small block formed with a special symbol as a part of a conventional type head.

Next, the present invention will be described in detail with reference to the drawings showing one embodiment of the present invention.

Referring to FIG. 1, a print head 1 according to an embodiment of the present invention includes a central accommodating hole 2, a circumferential positioning square hole 3,
to an external printhead drive mechanism (not shown). Knob 10 is used for attachment.

Letters 5 are formed at the tips of the radially extending arms 4, and two positioning holes are provided at the tips of each arm 4a.

The small block 7 has type 53 on one side, as shown in FIG.
Two protrusions 9 are formed on opposite sides, and when in use, the protrusions 9 are inserted into the positioning holes 6, as shown in FIG. The small block 7 is fixed by press-fitting the hole 6 and the protrusion 9 or by adhering the hole 6 and the protrusion 9.

Several examples of specific advantages brought about by the above configuration will be described below.

As a first example, if a user wants to use a unique symbol (for example, a trade name), and the user uses five different typefaces and typeheads, the conventional In contrast to the method of 2003, which required the creation of five different types of printheads specific to the user, the present invention requires only one small block to be created.

As a second example, if you use only a certain decimal symbol very often, you can put that symbol in the small block above, and when the type wears out, you can replace only the small block and replace the whole type head. We will make effective use of this information.

As a third example, if you use only a certain number of symbols very often like the second l+lJ, put that symbol in the above small block, and place this small block in a material that is harder than the other parts. By doing so, the life of the entire n-shaped head can be extended.

Although the above description has been made using so-called daisy-shaped type, it is clear that so-called cup-shaped type as shown in FIG. 4 can be equally considered.

[Brief explanation of the drawing]

Fig. 1 is a front view of a print head according to an embodiment of the present invention, Fig. 2 is a perspective view of a small block used in the embodiment shown in Fig. 1, and Fig. 3 is a print head shown in Fig. 1. FIG. 3 is a cross-sectional view of a combination of the small block shown in FIG. 2 and the small block shown in FIG. 1...Print head, 2...Central mounting hole, 3...Circumferential positioning hole, 4...
...Arm part, 4a... Arm with hole formed, 5...
...Printed characters, 5a...Printed characters formed in small blocks, 6...Positioning holes, 7...Small blocks, 9...Protrusions , 10... knob. 5- /θ Mine 1 Group Procedural Amendment (Method) February 5th, 1978, Director General of the Patent Office 1, Indication of Case 1982 Patent Application No. 1895
No. 64 No. 2, Title of the invention Printed text Hella 3, Relationship with the case of the person making the amendment Applicant 5-33-1 Shiba, Minato-ku, Tokyo (423) NEC Corporation Representative Tadahiro Sekimoto 4, Agent 〒 108 Sumitomo Sanda Building, NEC Corporation, 37-8 Shiba 5-chome, Minato-ku, Tokyo (6591) Patent Attorney Susumu Uchihara Telephone Tokyo (0
3) 456-3111 (main representative) (contact information: Hondenki Co., Ltd. Patent Department) 5. Date of amendment order: March 30, 1980 (shipping date) 6. Brief explanation of the drawings of the specification to be amended. Column L Contents of correction In the second line of page 5, insert "[Figure 4 is a perspective view of another embodiment of the present invention]" after J.

Claims (1)

[Claims] Characters are formed on one side of the ends of a plurality of arms of an elastic body extending radially from the center, and printing is achieved by placing characters on the opposite side of the arms. A type head, characterized in that at least one has a recess or a protrusion for mounting type.