JPS5898280A - Serial printer - Google Patents

Abstract

PURPOSE:To prevent the rising of a printing paper from a platen as well as remove static electricity charged to the printing paper by providing an electricity-removing brush to the printing head of a serial printer with a flat platen. CONSTITUTION:A brush 8a consisting of a bundled conductive fiber is fixed to the upper part of a printing head 3 by means of a metal tool 9. When a carriage 2 on which the printing head 3 is mounted is reciprocally moved in the crosswise direction of a printing paper 5, the brush 8a also moves while rubbing the surface of the printing paper 5 to remove static electricity charged on the surface of the paper 5 and at the same time to press the paper 5 on the flat platen 4a by the elasticity of its fiber.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a serial printer that carries a static elimination brush that also serves as a paper presser.

A static prior art serial printer is a printer in which a carriage 2 reciprocates on a fixed shaft 1, and a print head 3 mounted on the carriage 2 prints on a printing paper 5 on a platen 4. The print head 3 shown in the figure is of a wire dot type, and printing is performed via an ink ribbon 6. The printed paper 5 is intermittently fed by a tractor 7 in one or more lines and is stored on the back side of the serial printer. Normally, when a serial printer prints on the printing paper 5, static electricity is generated on the surface of the printing paper 5 due to mechanical effects and mechanical friction. Since this static electricity prevents storage of the printing paper 5 or causes dust to adhere to the surface of the printing paper 5, the static electricity is removed by rubbing the surface of the printing paper 50 with a conductive brush 8. This brush 8 has a length comparable to the horizontal dimension of the printing paper 5, is shaped like a brush, and is disposed at the rear of the tractor 7.

In recent years, speed ratios have been improved for printing in serial printers, and flat platens, which are more suitable for serialization, are being used instead of the conventional platen 4 having a circular cross section. This flat platen has a flat surface facing the print head, which reduces friction with the printing paper and increases printing speed.

Problems with the conventional valve technology In serial printers using this flat platen, the printing paper appears to be floating above the flat platen, and the printing paper comes into contact with the ink ribbon, causing the paper surface to become dirty or unprinted. Since the paper was not perpendicular to the print head, there was a drawback that the printing was φ-shaped.

First, if continuous printing is attempted, problems will arise with the placement of the brushes, which will hinder the feeding of the printing paper.

≠Purpose of the Invention The present invention was made in view of the above-mentioned drawbacks, and its purpose is to prevent printing paper from lifting up from the flat platen,
It is an object of the present invention to provide a serial printer that can simultaneously remove static electricity charged on the surface of paper.

According to the present invention, a conductive brush is provided on the print head, and this brush presses the print paper against the flat platen to prevent the print paper from rising from the flat platen. ) The above objective is achieved by removing static electricity generated in

Embodiments of the Invention Specific embodiments of the present invention will be described in detail with reference to FIGS. 2 and 3.

The illustrated flat platen 4a has a flat surface facing the print head 3. This flat platen 4a
is provided with an arcuate paper guide 4b projecting upward so that the direction of the printing paper 5 changes smoothly toward the outer circumference of the tractor 7. This reduces the bending elasticity of the paper and prevents the printing paper 5 from lifting off the flat platen. It also serves as a preventive measure.

The brush-like brush 8a itself is provided vertically at the top of the print head 3. This brush 8a may be fixed to the print head 3 using screws or other means, but as in this embodiment, an IICM m-shaped metal fitting 9 is fixed to the top of the print head 3 with its longitudinal direction perpendicular. However, it is also possible to form the attachment part of the brush 8a in a T-shape and to make it detachable by inserting this attachment part into the metal fitting 9 from above.

In this way, the brush 8a can be easily removed.
, later maintenance will be easier.

The brush portion of the brush 8a is formed by bundling conductive fibers, and its tip reaches the flat platen 4a. Although the portion of the printing paper 5 that is pressed against the printing paper 5 by such fibers is only a small portion of the printing paper 5, the printing paper 5 is gently bent by the paper guide 4b and the printing paper 5 is pressed against the printing paper 5.
Since the zero repulsive force is weakened, it is possible to lightly press the printing paper 5 against the flat platen 4a by the elasticity of the brush fibers. Incidentally, when the repulsive force of the printing paper 5 is strong, the diameter of the brush fibers can be increased to cope with this.

In the division 'i[#cIt, which has the above configuration,
When the carriage 2 carrying the print head 3 moves back and forth in the horizontal direction of the print paper 5 for printing, the print head 3
The flange 8a provided on the upper part of the flange 8a also moves together while rubbing the surface of the printing paper 5, and at this time, the printing paper 5 is pressed against the flat platen 4a by the elastic force of the brush fibers.

- When the printing of the characters is completed, the tractor 7 rotates simultaneously to advance a portion or more of the lines, and the same printing as described above is started.

Normally, the number of characters to be printed differs for each line, so the carriage 2 does not constantly move back and forth across the horizontal dimension of the printing paper 5. However, since static electricity is lightly charged on the surface of the printing paper 5, the plan 8a is printed. Even when a portion of the paper 5 is rubbed, it is possible to sufficiently remove static electricity. In preparation for such a case, especially in this embodiment, the brush portion of the brush 8a is provided on the print head 3 in a vertically elongated manner so as to cover the length of the print paper 5.

As explained in detail about the valve invention, according to the present invention, the printing paper does not lift up from the flat platen, ensuring clean printing without stains or distortion, and unlike the conventional method, the short brush eliminates static electricity generated on the printing paper. It becomes possible to remove.

Further, in the present invention, since the printing paper is pressed against the flat platen using the elasticity of the fibers of the brush, the coefficient of friction between the printing paper and the 7-rat platen does not increase, making it suitable for quick printing. Since the plan itself is provided in front of the tractor, there is no problem in feeding the printing paper 9.

[Brief explanation of drawings]

Figure 1 is a perspective view of a conventional serial printer; Figure 2 is a perspective view of a conventional serial printer;
The figure is a side view showing one embodiment of the present invention, and FIG. 3 is a perspective view showing essential parts of the present invention. l... Fixed axis 2... Carriage 3...
・Print head 4...Platen 4a...Flat platen 4b...Paper guide 5...Print paper 6...Ink ribbon 7...Tractor
8, 8a... Brush 9... Metal fittings agent Patent attorney Noriyuki Chika (and 1 other person)

Claims (1)

[Claims] A serial printer that prints on print paper via an ink ribbon by a print head mounted on a reciprocating carriage, comprising a flat platen facing the print head and a static elimination brush attached to the print head. The serial printer is characterized in that the removing brush '1 presses the front D-pi printing paper against the platen and removes static electricity generated on the printing paper.