JPS60122185A - Wire dot printer and ink ribbon cassette for the same - Google Patents

Abstract

PURPOSE:To obtain a wire dot printer reduced in noise level with a simple construction, by a method wherein a wire dot head exclusive of an impact surface is surrounded by a carriage and an ink ribbon cassette. CONSTITUTION:The wire dot head 5 is fixed onto the carriage 4, a wire is projected to the platen 1 side by an electromagnet device including an armature provided in the head 5, and is impacted against a printing paper 2 through an ink ribbon 7, thereby transferring an ink in a dot form. A head relief recessed part 8a having substantially the same shape as that of the head 5 and covering the head is provided on the lower side of the ribbon cassette 8. When being fitted onto the carraige 4, the cassette 8 cooperates with the carriage 4 in covering the head 5 exclusive of the impact surface in a substantially sealed condition. Accordingly, noise level can be lowered by an extremely simple construction.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a wire dot printer with reduced noise level and an ink ribbon cassette used therefor.

(Prior art) Conventionally, in wire dot printers, the collision between the armature in the wire dot head and the solenoid 1 (stopper, etc.) generates a large amount of noise, and this noise is a drawback of wired dot printers. Became(/again.

(Mejiro 9) An object of the present invention is to provide a wired printer with a simple structure, low power and low noise level, and a wired printer for reducing the noise level.
+-I will provide you with an Ereklipon cassette for your printer.

(Embodiment) Figures 1 and 2 show a wired printer that is an embodiment of the present invention. A sheet of printing paper 2 is wound around a cylindrical platen 1, and in front of the platen 1, a carriage 4 guided by a guide 3 parallel to the axis of the platen 1 reciprocates in the direction of the platen axis. . A wire dot head 5 is fixed on the carriage 4. The head 5 causes a plurality of wires 6 to protrude toward the platen l side using an electromagnetic device including an armature in the head 5, and strikes the printing paper 2 through the ink ribbon 7, thereby dotting ink onto the printing paper in the form of dots. I will transcribe it. The ink ribbon 7 is stored as an endless ribbon in an ink ribbon cassette 8, and is connected to the key ridge 4-1. The rephon feed gear (
(not shown) in conjunction with the movement of the carriage 4.

As shown in FIG. 3, the lower blade of the ribbon force set I/8 has the same shape as the wire dot head 5, is slightly larger than the head 5, and has four head escape parts 8 that cover this head.
a is formed. In the ribbon cassette 8, the ribbon 7 pulled out from the opening 1 at the tip of one arm 8b is guided into the cassette 8 through the opening at the tip of the other arm 8C, and the ribbon is routed between the two openings 1. When such a ribbon cassette 8 is mounted on the carriage 4, it cooperates with this carriage to almost tightly cover the head 5 except for its striking surface.
cover the condition. That is, a carriage covers the lower surface of the head 5, and a ribbon cassette 8 covers both sides, back and upper surface of the head.

It should be noted that the present invention is not limited to the above-mentioned embodiments; for example, the ink ribbon cassette may have any shape, as long as the head can be substantially hermetically sealed. Furthermore, it is not necessarily applicable only to serial types that require a carriage, but also to those with a fixed head.

(Effects) As described above, according to the present invention, it is possible to reduce the noise level in a wire dot printer with an extremely simple configuration. Moreover, a new ink ribbon cassette for that purpose can be provided.

[Brief explanation of the drawing]

The set is shown in a side view and a bottom view, respectively. 4・Meeting・Carriage 5◆・・・Wire tod head 7 fists O ink ribbon 8・ψ medium ink ribbon cassette 8a...Four parts for head escape Applicant: Canon City; -r- Co., Ltd.

Claims (2)

[Claims] (1) In a wire dot printer in which an ink ribbon pulled out from an ink ribbon cassette is struck by a wire truck I head to transfer ink in the form of dots, the wire dot head is connected to the carriage and the ribbon, excluding the striking surface of the wire dot head. A wire dot printer characterized by a cassette. (2) An ink ribbon cassette for a wire dot printer, comprising four parts that house an ink ribbon therein and cover at least the side, back and two sides of the wire dot head when installed.