JPS59142176A - Platen - Google Patents

Abstract

PURPOSE:To reduce the weight and size of a platen, by a method wherein a main body formed of a stiff material is provided with impacted members formed of an elastic material. CONSTITUTION:Four impacted members 9a-9d formed of a rubber, a plastic or the like are fitted respectively to four faces of a main body 8 of the platen formed of a stiff material and being a quadrilateral prism in shape to constitute the platen. When the impacted member 9a is damaged, another impacted member 9b, 9c or 9d can be immediately set by rotating the platen with a point P as a center, so that printing can be continued without wasting time. A main body 10 of a platen being a quadrilateral prism in shape is obtained by detachably fitting impacted members 11a-11d into grooves 12a-12d. In general, a type face 14 of a type 13 is provided with a radius of concave curvature of about R60. Since an impacted surface of the impacted member 15 of the platen 17 is provided with a radius of convex curvature conforming substantially to that of the type face 14, the same print quality as that of a large-type cylindrical platen can be obtained although the platen 17 is small in size.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a platen that can be used in typewriters and the like.

Conventional configuration and its problems The platen used in conventional typewriters, etc.
As shown in FIG. 1, the platen 2 was cylindrical and large, so the shape of the typewriter main body 1 was large.

Furthermore, in the case of a type that moves the platen, the load is large due to its heavy weight, and in the case of an electric type, a motor with large torque is required, which is a factor in high cost. Furthermore, even if a portion of the striking portion on the surface of the platen is damaged, the entire platen 2 must be replaced with a new one, resulting in a large economic loss.

OBJECTS OF THE INVENTION The present invention obviates these conventional drawbacks,
To provide a light, small, and inexpensive platen with a simple configuration.

Structure of the Invention The platen of the present invention has a structure in which a striking member made of an elastic material or a plastic material is formed on at least one surface of a columnar member made of a rigid material, and is lightweight and compact.

Furthermore, by providing the striking surface of the striking member with a convex curvature that almost matches the concave curvature of the type face of the type, the same printing quality as that of a large circular platen can be ensured. Furthermore, it is economical because only the striking member made of an elastic material or the like can be replaced. Furthermore, in the case of a platen having multiple striking members, if one striking surface becomes damaged and becomes unusable, the platen can be rotated.
By adopting a structure in which a separate striking member is set, there is no need to waste time during repairs.

Description of examples An embodiment of the present invention will be described below with reference to the drawings.

Figure 2 shows a typewriter equipped with the platen 4 of the present invention.
FIG. 6 is an overall view of 6.

A specific example of the platen 4 will be described with reference to FIGS. 3 to 5. In Fig. 3, reference numeral 6 denotes a platen body made of a rigid material such as metal or plastic with a part cut off (cross-sectional shape), and a blower made of rubber or plastic on its flat surface. Member 7 is attached.

In FIG. 4, reference numeral 8 denotes a square prism platen body made of a rigid material, and four striking members 9a made of rubber, plastic, etc. are provided on its four sides.

For example, if the striking member 92L is damaged while using the typewriter, by rotating it around point P, the other striking members 9b, 9Q, The 9d can be set up immediately and printing operations can be continued without wasting time or effort.

In FIG. 6, grooves 12&, 12b, 12C, and 12d are provided in the square prism platen body 1°, and the striking members 11a, 11b are inserted into the grooves.

110.11d is detachably attached.

In Figure 6, 13 is a typeface, and generally the typeface 1
4 has a concave curvature of approximately R60, 17 is a platen body, and 16 is a striking member. The striking member 1
The striking surface 16 of No. 6 has a convex curvature that matches the printing surface 14. Therefore, despite the small size, the same printing quality as a conventional large cylindrical platen can be obtained.

In FIG. 7, a trapezoidal groove 2 is provided in the platen body 18.
0, and the striking group member 19 which fits into the groove 2o with almost no space is attached in a replaceable manner, and it is economical because only the damaged striking group member 19 needs to be replaced. It is needless to say that shapes other than trapezoidal grooves may also be used.

Further, although the platen is shown as a square prism in FIGS. 4 to 7, it is not limited to this shape.

Effects of the Invention As described above, the present invention allows the platen to be made smaller in size.Furthermore, even if the striking portion or striking surface is damaged, there is no need to replace the entire platen as in the conventional case, and rubber or plastic can be used instead. It is economical because it is only necessary to exchange the striking part profit made by etc.

Further, by providing the striking surface of the striking member with a convex curvature that almost matches the concave curvature of the type face of the type, it is possible to obtain the same printing quality as that of a large cylindrical platen.

[Brief explanation of the drawing]

Figure 1 is a perspective view of a typewriter equipped with a conventional round cylindrical platen, Figure 2 is a perspective view of an embodiment of a typewriter equipped with the platen of the present invention, and Figures 3 to 7. 1 is a perspective view and a side view showing a specific embodiment of the platen of the present invention. 6... Platen, 7... Hitting member, 13
...Print, 8, 10, 17.18...
Platen body, 9.11.15.19・River・Strike member. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
figure? Figure 3

Claims (3)

[Claims] (1) A striking member made of an elastic material or a plastic material is provided on at least one surface of a platen main body formed of a rigid material, and the striking surface of the striking member has a curvature approximately equal to the curvature of the recess on the typeface of the type. A platen characterized by a matching convex curvature. (2) The platen according to claim 1, wherein only the striking member made of an elastic material or the like is replaceable. (3) The platen according to claim 1, characterized in that striking members are provided on two or more surfaces of the platen body, and different striking members can be used by rotating the platen body.