JPH04247971A - Dot impact printing mechanism - Google Patents

Abstract

PURPOSE:To mitigate an accuracy required for a flatness of a mask in a dot impact printing mechanism and obtain a printing mechanism having no possibility of staining paper. CONSTITUTION:A mask 3 is mounted on a card holder 2 so as to be levitated. Pins 5a, 5b are erected on the card holder. Holes are provided on the mask correspondingly to the pins. The mask is mounted on the pins through the holes.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dot impact printing mechanism having a mask floatingly provided between a print head and printing paper.

0002

[Prior Art] In the conventionally used dot impact printing mechanism, a mask is fixed with a certain gap between the print head and the print paper, and between the print paper and the print head. .

0003

In the conventional dot impact printing mechanism described above, since the mask is fixed, there is a strong demand for precision in the flatness of the surface of the mask that comes into contact with the printing paper. In particular, if the flatness of the surface in contact with the print paper falls below a predetermined precision, there is a problem that the print paper becomes stained when printing is completed.

An object of the present invention is to provide a dot impact type printing mechanism that alleviates the flatness requirements for the surface of the mask that comes into contact with the printing paper and does not stain the printing paper.

[0005]

[Means for Solving the Problems] The dot impact printing mechanism of the present invention includes a print head that is driven according to print information, a card holder, and a mask that is floatingly attached to the card holder. .

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be explained with reference to the drawings.

FIG. 1 shows an embodiment of the present invention.

In the figure, a dot impact type printing mechanism A is composed of a print head 1, a card holder 2, and a mask 3.

The print head 1 is driven according to the print information, hits an ink ribbon (not shown) disposed between the print head 1 and the mask 3, and transfers the ink applied to the ink ribbon onto the print paper 4. Printing is performed by

The card holder 2 has two pins 5a, 5.
b is provided. The mask 3 has the pins 5a and 5b.
Holes having dimensions approximately equal to the thickness of the pins 5a and 5b are formed at positions corresponding to the pins 5a and 5b, respectively. and pin 5a
, 5b are fitted into holes formed in the mask 3, so that the mask 3 is attached to the card holder 2 in a floating manner.

The mask 3 configured as described above does not necessarily always move in parallel when an external force is applied;
The pin 5a side or the pin 5b side moves depending on the direction of the force acting on the mask 3. For this reason, mask 3
When the printing paper 4 comes into contact with the surface of the mask 3, the mask 3 slides in the direction of the arrow a along the pins 5a or 5b and retreats. Further, when the print head 1 is driven, the impact force at this time is transmitted to the mask 3 via the ink ribbon, and the mask 3 slides along the pins 5a and 5b in the direction of arrow b.

Therefore, when the printing paper 4 comes into contact with the mask 3, the surface of the mask 3 can always maintain a posture parallel to the surface of the printing paper 4.

[0013]

[Effects of the Invention] As explained above, in the present invention, by attaching the mask disposed between the print head and the print paper to the card holder in a floating manner, when the print paper comes into contact with the mask, the mask is placed between the print head and the print paper. You can evacuate in response to contact. Therefore, it is possible to reduce the precision of the flatness of the surface of the mask that comes into contact with the printing paper, and there is also an effect that the printing paper is not stained after printing is completed.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of an embodiment of the present invention.

[Explanation of symbols]

A. Dot impact printing mechanism 1 Print head 2 Card holder 3. Mask 4 Printing paper 5a, 5b pin

Claims (2)

[Claims] Claim 1: A dot impact printing mechanism comprising a print head driven according to print information and a mask disposed between the print head and printing paper, in which the mask can be floated on a card holder. A dot impact printing mechanism characterized by being attached to. 2. The dot impact type printing mechanism according to claim 1, wherein the mask is slidably attached to a pin member provided on a card holder.