JPH0699642A - Thermal printer head pressurization adjusting mechanism - Google Patents

Abstract

PURPOSE:To obtain a head pressurizing mechanism capable of arbitrarily increasing/decreasing a pressurizing force to a thermal printer head correspondingly to a change in printing paper width and a variation of a printing position on paper for the enhancement of a printing quality. CONSTITUTION:A title mechanism comprises a platen 1 feeding paper; a thermal printer head 2 making printing on paper; a bracket 3 pressurizing the thermal printer head; and adjusting screws 4 adjusting a pressurizing force.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressurizing mechanism for a thermal printer head, and more particularly to a device capable of correcting a difference in printing condition due to a difference in paper width and a print position of a paper sheet by increasing or decreasing a pressing force. Is.

[0002]

2. Description of the Related Art Referring to FIG. 3, a thermal printer head 2 is movably fixed to a bracket 3 with a central portion of the thermal printer head 2 as a fulcrum, and the thermal printer head 2 is added to a platen 1 from an upper surface of a bracket 3. A general mechanism is to keep the pressure applied to the printing paper or the thermal transfer ribbon by the thermal printer head 2 constant by applying pressure.

[0003]

Referring to FIG. 4, in the mechanism described above, when the thermal printer head 2 is pressed to print a narrow printing paper on either side of the thermal printer head 2, the thermal printer The head 2 tilts by the thickness of the paper, which causes a change in the pressure applied to the printing paper, and there is a problem that the print quality of a narrow paper is significantly lower than that of a wide paper.

[0004]

With reference to FIG. 1, when a printing paper 5 having a narrow paper width is pressed against the end of the thermal printer head 2 and the platen 1, the thermal printer uses the protrusion of the bracket 3 as a fulcrum. Because the head 2 tilts,
The printing pressure applied to the paper becomes unstable. This unstable printing pressure can be adjusted by tightening or loosening the left and right adjusting screws 4.
By adjusting the thermal printer head 2 so that it is parallel to the platen 1 and adjusting the printing paper with an appropriate pressure, the printing paper is printed with clear image quality.

[0005]

EXAMPLE A printing pressure adjusting mechanism for a thermal printer head according to the present invention shown in FIGS. 1 and 2 will be described. First, the overall outline will be described with reference to FIG. 2 showing the overall configuration. The printing paper 5 and the transfer ribbon 6 are supplied by respective guides and the like, and the thermal printer head 2 supported by the bracket 3 is pressed against the platen 1. Printing is performed by energizing the thermal printer head. Next, referring to FIG. 1, the thermal printer head 2 attached to the bracket 3 is pressed against the platen 1 as described above,
When printing a narrow print paper on either side of the thermal printer head 2, the thermal printer head 2 is inclined by the thickness of the paper (see FIG. 4), and the printing pressure applied to the paper changes. When printing this narrow printing paper, by rotating the adjusting screw 4, the screw can adjust the variation in the gap between the heads in parallel, and the pressure can be adjusted equally. By operating in this way, the printing pressure of the thermal printer head 2 can be achieved in a stable state. Further, when the use of the narrow paper is limited to only one side of the thermal printer head 2, the adjustment screw 4 can perform print adjustment only on the print paper side.

[0006]

The pressure adjusting mechanism of the thermal printer head according to the present invention can keep the printing pressure constant regardless of the width of the printing paper, so that clear printing can be surely performed on the paper. It has the advantage that

[Brief description of drawings]

FIG. 1 is a front view of a printing pressure adjusting mechanism of the present invention.

[Fig. 2] Side view

[Fig. 3] Front view of a conventional mechanism

[Fig. 4] Front view of the problem explanation

[Explanation of symbols]

 1: Platen 2: Thermal printer head 3: Bracket 4: Adjustment screw 5: Printing paper 6: Transfer ribbon

Claims (1)

[Claims] In a thermal printer that presses the thermal printer head against the platen and presses the thermal paper or thermal transfer ribbon and the paper to heat the thermal printer head for printing, the entire thermal head is pressed by being pressed from the center of the thermal printer head. The head pressing mechanism is characterized by being pressed by a uniform pressure, but the pressurization can be freely increased or decreased according to the change of the paper width and the print position of the paper.