JPS62108075A - Platen - Google Patents

Abstract

PURPOSE:To obtain a platen light in weight, low in noise and inexpensive, by providing a rigid plastic on the outer periphery of a metallic shaft in an integral form, and covering the outer periphery of the plastic by a coated layer. CONSTITUTION:A cylindrical body 2 of a rigid plastic is provided on the outer periphery of a metallic shaft 1 in an integral form, and the outer periphery thereof is covered by a coated layer 3 of a rubber elastic material or a flexible plastic having the same degree of elasticity as that of the rubber elastic material. The rigid plastic used for the cylindrical body 2 may be, for example, polypropylene, rigid polyvinyl chloride, ABS, a polyamide, polyacetal or PBT. To provide the cylindrical body 2 on the outer periphery of the shaft 1 in the integral form, a plastic molding method such as injection molding can be adopted. To enhance adhesion to the rigid plastic, the shaft is usually is subjected to knurling process at a part to be covered by the plastic.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a platen used in printing devices such as printers and typewriters.

[Prior art]

Conventionally, platens used in printing devices such as printers and typewriters have a rubber elastic material on the outer periphery of a metal shaft αυ attached to the outer periphery of a metal shaft αυ, as shown in Figures 1 and 2. Generally, the material is coated with a coating layer 0 consisting of the body. This type of platen has disadvantages such as being heavy because it has many metal parts, making a lot of noise because there is a void inside the metal ζ plate, and being expensive. It was rare. In particular, there is a strong desire to reduce the weight and cost of hand-held typewriters and the like, whose demand has increased rapidly in recent years.

[Purpose of the invention]

The present invention was completed after various studies in order to obtain a lightweight, low-noise, and low-cost platen.

[Structure of the invention]

As shown in FIGS. 3 and 4, the present invention includes integrally forming a cylindrical body (2) made of hard plastic on the outer periphery of a metal shaft 7 (1), and a rubber elastic body on the outer periphery. Alternatively, the platen is coated with an outer coating layer made of a soft plastic having elasticity of the same degree.

In the present invention, the hard plastic used for the cylindrical body (2) formed on the outer periphery of the metal shirt (1) can be any hard plastic, but for example, N IJ propylene, hard plastic, etc. can be used. Vinyl chloride, ABS,
Hylyamide, polyacetal, PBT, etc. can be mentioned. Moreover, these waste materials can also be used.

Furthermore, if weight reduction is particularly required, the cylinder can be made of foamed rigid plastic. On the other hand, increasing rigidity,
In order to reduce the shrinkage rate and improve dimensional stability, it is also possible to use a material reinforced with an inorganic material or the like.

In order to integrally form this cylindrical body (2) on the outer periphery of the shaft (1), a plastic molding method such as injection molding can be employed. In order to improve adhesion to hard plastic, the shaft is usually machined with holes where the plastic is coated.

Hard rubbers such as imprene rubber and ethylene propylene rubber, rubber-based synthetic resins such as styrene butadiene rubber, acrylonitrile butadiene rubber, acrylic rubber, polyurethane rubber, silicone rubber, and polyester rubber, or mixtures and copolymers thereof. be.

〔Effect of the invention〕

The platen of the present invention uses hard plastic instead of the conventional metal zip and is integrally formed on the outer periphery of the metal shaft, thereby achieving weight reduction, low noise, and cost reduction. In particular, it can be suitably employed in hand-held typewriters and the like, the demand of which has been rapidly increasing in recent years.

[Brief explanation of drawings]

1 and 2 are sectional views of a conventional platen, and FIGS. 3 and 4 are sectional views of a platen of the present invention. ■, 11 Metal shaft 12 Metal pipe 2, Cylindrical body 3.13: Coating layer Fig. 1 Fig. 2

Claims (1)

[Claims] A platen in which a cylindrical body made of hard plastic is integrally formed around the outer periphery of a metal shaft, and the outer periphery of the cylindrical body is covered with a coating layer made of a rubber elastic body or a soft plastic having the same degree of elasticity.