JPH02303873A - Thermal printer - Google Patents

Abstract

PURPOSE:To prevent dot-off and damage of a thermal head due to static electricity as well by providing an electricity removal brush in contact with whole width of a sheet in advance of a thermal head on a sheet transfer route. CONSTITUTION:A heat sensitive sheet 3 is interposed between a line thermal head 1 and a platen 2 so as to be conveyed under the frictional feed forces caused by a platen 2 driven by a drive motor 7 through a motor gear 8, idler gear 6 and platen gear 5, and the line thermal head 1. And an electricity removal brush 4 is fixed in advance of the head 1 in the direction of conveyance so as to always contact the sheet 3, and hence static electricity is automatically removed from said sheet, while being conveyed, thereby preventing powder of sheet from getting into a printing section, with the result that dot-off is avoided and further electricity is removed from the sheet 3 having been charged due to the friction between the sheet 3 and a roll sheet supporter 9 to prevent damage of the head 1 because of static electricity. As a result, favorable quality of printed character can be obtained and a thermal printer free from damage due to static electricity can be provided.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a structure of a thermal printer that can prevent paper powder from entering the head section of a direct line type thermal printer and remove static electricity at the same time.

[Conventional technology]

Conventional apparatuses have a mechanism that only automatically cleans thermal recording paper, as described in Japanese Utility Model Application No. 60-154150.

[Problem to be solved by the invention]

The above-mentioned conventional technology does not take into account static electricity, and there are problems such as damage to the thermal head due to static electricity, and paper dust attached to thermal paper due to static electricity cannot be cleaned and enters the printing area, resulting in missing dots. there were.

The purpose of the present invention is to remove paper dust and prevent dot dropout, and also to prevent damage to the thermal head due to static electricity.

[Means to solve the problem]

In order to achieve the above objective, a static electricity removal brush that contacts the entire width of the paper is installed in front of the thermal head in the paper transport path to remove static electricity charged on the thermal paper. .

[For production]

Thermal paper passes above the static electricity removal brush with its printing surface facing downward, and is constantly in contact with the static electricity removal brush, removing static electricity as it is fed. This prevents damage to the thermal head due to static electricity, and prevents static electricity from adhering to the thermal paper. Paper dust can be easily removed.

〔Example〕

An embodiment of the present invention will be described below with reference to FIG.

The thermal paper 3 is sandwiched between a line-type thermal head 1 and a platen 2, and the drive motor 7 is driven by friction feed between the platen 2 and the line-type thermal head 1, which is transmitted by a motor gear 8, an idler gear 9, and a platen gear 5. transported.

The static elimination brush 4 is fixed in front of the line-type thermal head 1 in the conveying direction, and as it is always in contact with the thermal paper 3, the static electricity is automatically eliminated during conveyance, preventing paper powder from entering the printing area and dot-free. This has the effect of preventing the thermal paper 3 from coming off, and also eliminating static electricity from the charged thermal paper 3 due to friction between the thermal paper 3 and the roll paper receiver 9, thereby preventing destruction of the line type thermal head 1 due to static electricity.

[Effects of the Invention] According to the present invention, dust such as paper dust is always automatically removed, thereby preventing missing dots and achieving good print quality.

Furthermore, since static electricity can be removed, it also has the effect of preventing damage to the thermal head due to static electricity.

[Brief explanation of the drawing]

FIG. 1 is a side view of one embodiment of the present invention. 1... Line type thermal head, 2... Platen,
3... Thermal paper, 4... Static elimination brush, 5... Platen gear, 6... Idler gear, 7... Drive motor,
8...Motor gear, 9...Roll paper holder.

Claims (1)

[Claims] 1. A line-type thermal printer consisting of a line-type thermal head, a platen, and thermal paper, characterized in that a static elimination brush that contacts the entire paper width is attached to the front of the line-type thermal head in the conveyance direction.