JPH0513571Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The invention is based on a method in which a type sheet wrapped around a cylindrical type sheet holder is given an impact by a printing hammer mechanism inside the cylindrical type sheet holder, resulting in printing. The present invention relates to a compact printer for forming.

[Conventional technology]

Figure 3 shows the movement of type in a conventional small printer. FIG. 3a shows the standby state, and FIG. 3b shows the printing state. The type 1a of the type sheet 1 is printed on the printing paper 21
When contacting the type sheet, the surface of the type was curved due to the tension of the thin portions 1b and 1c of the type sheet.

[Problem that the invention attempts to solve]

However, with conventional small printers, the surface of the type is curved when printing, resulting in problems such as printing shading and missing characters, and in order to print correctly, it is necessary to increase the printing mechanism's ability and apply strong pressure. It had drawbacks.

Therefore, the purpose of the present invention is to provide a compact, inexpensive, and low-power compact printer that is free from printing shading and missing characters.

[Means for solving problems]

The compact printer of the present invention is characterized in that the center portion of the type is formed lower than the end portions so that the surface of the type becomes substantially flat during printing.

[Effect]

According to the present invention, since the surface of the type becomes substantially flat during printing, problems such as printing shading and missing characters are eliminated, and good printing can be obtained even with small printing energy.

〔Example〕

An embodiment of the printer mechanism according to the present invention will be described below with reference to FIGS. 1 and 2. Figure 1 is a side sectional view, Figure 2 is a diagram showing the movement of type;
Figure a shows the standby time, and Figure 2 b shows the printing time.

1 is a type sheet made of a soft material such as rubber, which is wrapped around the outer periphery of a type sheet holder 2 and has type 1a on its surface;
3 is a yoke forming a yoke of the electromagnet, 4 is an iron core fixed to the yoke 3, 5 is a coil, 6 is a hammer slidably set inside the coil 5, 7 is located inside the coil 5, and the hammer 6 It is a suction plate that moves almost integrally with the coil 5 and is driven to approach the iron core 4 by suction force when the coil 5 is energized.

Next, the operation will be explained.

The type set consisting of the type sheet holder 2 and the type sheet 1 is rotated, and the predetermined type 1a is placed at the printing position 25.
When this occurs, the rotation of the type set is stopped, the coil 5 is energized to drive the hammer 6, and the characters are struck from the back side of the type 1a to print the characters on the printing paper 21. At this time, the type 1a is curved due to the tension of the thin portions 1b and 1c of the type sheet, but since the center of the type surface is formed lower than the end portions, the type surface remains almost flat.
The type comes into contact with the printing paper. Therefore, high-quality printing without printing shading or missing characters can be obtained even with small printing energy.

[Effect of idea]

As explained above, in this invention, the center part of the type is formed lower than the edges in advance, so the surface of the type becomes almost flat during printing, and even with small printing energy, high-quality printing without printing shading or missing characters can be achieved. is obtained. Also, because it requires only a small amount of printing energy,
The capacity of the printing mechanism can be lowered, making it possible to supply a small, inexpensive, and low-power compact printer.

[Brief explanation of the drawing]

FIG. 1 shows a main cross-sectional side view of a small printer according to the present invention. FIG. 2 is a diagram showing the movement of type in the small-sized printer according to the present invention, in which "a" shows the standby time and "b" shows the printing time. Figure 3 is a diagram showing the movement of type in a conventional small printer, where a is during standby;
b is a diagram showing the time of printing. 1...Type sheet, 2...Type sheet receiver, 6
... Hammer, 20 ... Platen.

Claims (1)

[Scope of Claim for Utility Model Registration] A type sheet with type on its surface, a cylindrical type sheet holder around which the type sheet is wrapped, and a cylindrical type sheet holder arranged inside the type sheet holder so that the type protrudes from the inside. What is claimed is: 1. A small-sized printer, comprising: a printing hammer mechanism for performing printing, wherein a center portion of the type is formed lower than an end portion of the type.