JPH03182381A - Serial printer - Google Patents

Abstract

PURPOSE:To prevent the occurrence of discharge due to static electricity and to improve reliability and stability of printing of a printer by a conduction means to induce static electricity with which a ribbon is charged to a printer body of an earth potential. CONSTITUTION:A printing head 5 is in a state to be electrically continued to a printer body 10, and the potential of the printing head 5 produces the same earth potential as that of the printer body 10. Static electricity with which a ribbon 7 is charged is induced to the printer body 10 through a tension spring 9, a coil spring 1, a push piece 2, a leaf spring 4, and the printing head 5 for removal. Further, static electricity with which a ribbon cassette is charged is induced to the printer body 10 through the ribbon 7 brought into pressure contact with a casing 8 of the ribbon cassette, the tension spring 9, the coil spring 1, the push piece 2, the leaf spring 4, and the printing head 5 for removal. Thereby, the ribbon 7 and the casing 8 of the ribbon cassette are prevented from being charged with static electricity, and discharge due to static electricity is prevented from occurring to the pin part of the printing head 5 brought into contact with the ribbon 7.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a serial printer.

[Conventional technology]

Conventionally, this type of serial printer performs printing by feeding out a ribbon in a ribbon cassette and transferring ink from the ribbon onto a recording medium using a print head.

[Problem to be solved by the invention]

When the above-mentioned conventional ribbon cassette is used in a low humidity condition, the ribbon and ribbon cassette are charged with static electricity due to the 7:I friction between the gate and the ribbon, and the static electricity charged to a high voltage is discharged at the bottle portion of the print head. Therefore, there is a drawback that the electric circuit is adversely affected, and in the worst case, the printed data may be distorted or the printing may stop.

An object of the present invention is to provide a serial printer that solves the above problems.

[Means to solve the problem]

In order to achieve the above object, a serial printer according to the present invention is a serial printer that performs printing by feeding out a ribbon in a ribbon cassette and transferring the ink of the ribbon to a recording medium by a print head, the printer comprising: It has a conductive means for guiding the charged static electricity to the printer body which is at ground potential.

〔Example〕

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a left four side view showing one embodiment of the present invention, and FIG. 2 is a plan view showing a ribbon cassette with a cover removed.

In the figure, a long ribbon 7 is stored in housing #8 of a ribbon cassette attached to the ribbon base 3.
It has a structure in which the ribbon 7 is fed out and the print head 5 transfers ink from the ribbon 7 onto a recording medium to perform printing. Further, 6 is a cover for closing the casing 8 of the ribbon cassette. This structure is the same as before.

The present invention guides the static electricity charged on the ribbon 7 toward the printer main body, and helps prevent discharge of static electricity at the print head. That is, the print head 5 is connected to the printer main body 1.
0, and the potential of the print head 5 is the same as the printer main body 10, which is the ground potential. Therefore, a part of the bottom of the ribbon cassette casing 8 has an opening facing the outside. A bushing piece 2 made of a conductive plastic material is slidably provided inside the M tubular part 8a, and the bushing piece 2 is urged downward by a metal coil spring 1. The metal plate spring 4 is crimped onto the ribbon base 3 by the piece 2. The leaf spring 4 comes into elastic contact with the print head 4 while being pressed and held by the bushing piece 2.

Further, the coil spring 1 is engaged with a metal tension spring 9, and the tension spring 9 presses the ribbon 7 against the casing 8 of the ribbon cassette.

Also, the static electricity charged on the ribbon 7 is transferred to the tension spring 9, a coil spring! , is guided to the printer body 10 via the bushing piece 2, the leaf spring 4, and the printing head 5,
removed. Further, the static electricity charged on the ribbon cassette is transferred to the coil spring 1 through the ribbon 7 and the tension spring 9 that are in pressure contact with the ribbon cassette housing 8.
, the pull bead 2, the leaf spring 4, and the print head 5, and are guided and removed to the printer main body 10.

Therefore, the ribbon 7 and the casing 8 of the ribbon cassette are not charged with static electricity, and no discharge due to static electricity occurs at the pin portion of the print head 5 that is brought into contact with the ribbon 7.

〔Effect of the invention〕

As explained above, the present invention has the effect of guiding the static electricity charged on the ribbon to the printer body side, which is at ground potential, thereby preventing discharge based on static electricity and improving the reliability and stability of printing by the printer. be.

[Brief explanation of drawings]

Figure 2 is a left side view showing one embodiment of the present invention, and Figure 2 is a plan view showing the ribbon cassette with the cover removed. ■...Coil spring 2...Button piece 3
... Ribbon base 4 ... Leaf spring 5 ... Print head 6 ... Cover 7 ... Ribbon 8 ... Ribbon cassette casing 9 ... Tensilan spring

Claims (1)

[Claims] (1) A serial printer that prints by transferring ink from the ribbon onto a recording medium using a print head while feeding out a ribbon in a ribbon cassette, and which is a conductive printer that guides static electricity charged on the ribbon to the printer body at ground potential. A serial printer characterized in that it has means.