JPS587468B2 - impact printer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an impact type printer that prints by striking elastically supported type with a printing hammer.

Conventionally, in computer terminal printers, electric typewriters, etc., a type wheel is rotated, or an endless belt supporting a large number of types via elastic support pieces is rotated to move the type onto the type wheel. Impact type printers are known in which characters to be printed on a belt are selected at a printing position, and the characters are struck from above an ink ribbon or printing paper against a platen using a printing hammer to perform printing.

It is an object of the present invention to reduce the printing noise generated when printing type, which is a disadvantage of such an impact printer.

The figure shows an example of an impact type printer using a type wheel, in which 1 is a platen, 2 is a printing paper, 3 is an ink ribbon, and 4 is a type wheel, each of which has a large number of elastic spokes 41 arranged radially. It consists of printed characters 42 formed at the tip of the spoke on the side facing the platen.

5 is a printing hammer. The print wheel 4 and its rotational drive mechanism, the print hammer 5 and its drive mechanism are mounted on a common carriage, and their lateral movement is controlled in parallel to the platen 1 as a whole.

The above-mentioned type wheel rotation drive mechanism, print hammer drive mechanism, and carriage mechanism are the same as those of the conventional type, and are therefore omitted from the figure.

When the type 42 to be printed on the type wheel 4 is positioned at the printing position on the paper 2 due to the movement of the carriage and the rotation of the type wheel, the print hammer 5 moves in synchronization with this to protrude in the direction of the platen 1, causing a roar to hit the back of the type. Print type with ink ribbon 3.
Printing is performed by striking the platen 1 from above the printing paper 2.

At this time, the vibration sound of the type and the vibration sound of the printing paper become printing noise.

In order to reduce printing noise in the above-mentioned impact printer, the present invention urges the type to be printed in advance toward the platen against the elasticity of its support member, thereby causing the type and the platen to interact with each other. A member is provided between which the ink ribbon and printing paper are held down.

Specifically, as shown in the figure, a compressible elastic member (coil spring, elastic rubber, etc.) 6 is placed in the vicinity of the type striking tip surface of the printing hammer 5, and its tip is moved slightly forward of the type striking tip surface of the printing hammer. It is integrally attached to the printing hammer 5 in a protruding manner.

That is, when the printing hammer 5 protrudes toward the platen for printing, the tip of the elastic member 6 that slightly protrudes from the tip surface of the hammer first collides with the back surface of the type 42 to be printed, and the elastic member 6 pushes the type. The ink ribbon 5 is pushed toward the platen against the elasticity of the spokes 41.
It is pressed against the platen 1 via the printing paper 2.

The elastic member 6 is then compressed between the back of the type and the hammer 5 by the continued advancement of the hammer 5 (FIG. 2).

Meanwhile, the type is pressed against the platen.

After that, the tip of the hammer disappears on the back of the pressed type, and the type is struck and printed (Figure 3).
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In the present invention, as described above, before the type 42 is hit by the hammer 5, the type 42 is pressed against the platen side against the elasticity of the supporting member 410, and then the type is hit with the hammer. Therefore, the vibration when the type is hit
Vibration of the printing paper is suppressed, thereby making it possible to significantly reduce printing noise.

Furthermore, the present invention is not limited to the illustrated type wheel type, but also uses a type belt to which a number of types are attached via elastic support pieces, etc., and prints by hitting elastically supported type with a printing hammer. It can be successfully applied to various types of impact type printers.

[Brief explanation of the drawing]

The figures show an embodiment of the present invention, in which Fig. 1 shows the state before printing, Fig. 2 shows the state immediately before the printing hammer hits the back side of type, Fig. 3 shows the state after striking, and Fig. 3 shows the state before printing. FIG. 4 is an enlarged perspective view of a portion of the printing hammer and type wheel. 1 is a platen, 2 is a printing paper, 3 is an ink ribbon, 4 is a type wheel, 41 is a spoke, 42 is a type, 5 is a print hammer, and 6 is a type urging member.

Claims (1)

[Scope of Claims] 1. An impact type printer that performs printing by hitting the back side of type that is supported freely by an elastic support member with a printing hammer, and hitting the type surface against a platen via an ink ribbon and printing paper. In this case, a crushing elastic member is integrally attached to and supported by the printing hammer in the vicinity of the type striking tip of the printing hammer, with its tip protruding forward beyond the type striking tip surface of the rabbit hammer. Before the type striking tip surface of the printing hammer that protrudes for impact hits the back of the type, the above-mentioned compressible elastic member that protrudes forward from the type hitting tip surface of the printing hammer hits the one character hammer on the back of the type. By pressing the vicinity of the abutting part, the type is pushed toward the platen against the elasticity of its supporting member, and the ink ribbon and printing paper are pressed between the type and the platen. An impact type printer characterized in that the above-mentioned compressible elastic member is compressed between the printing type and the printing hammer by the protruding action, and the leading end surface of the printing hammer is brought into contact with the back surface of the printing type.