JPS604763Y2 - Thermal printer printing device - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a printing device for a thermal printer.

A conventional thermal printer printing device includes a thermal print head, thermal paper, a print stand for pressing the thermal head, and a microswitch for detecting that the thermal print head and the thermal paper are in close contact with each other.

FIG. 1 shows a side view of a conventional thermal printer printing device.

In FIG. 1, a print stand 1 adhesively fixed to a plastic case is provided with the following elements to ensure uniform contact between the thermal paper 2 and the thermal print head 3 supported by a leaf spring 7.
An elastic rubber sheet 4 is placed on the thermal print head 3, and the thermal print head 3 presses the rubber sheet 4 on the print table 1 through the thermal paper 2, thereby pressing the lever 6 and activating the microswitch 5. Printed on paper 2.

In this case, if the heating element of the thermal print head 3 and the thermal paper 2 are not in close contact with each other, it will not be possible to print cleanly, so when the thermal print head 3 is in proper contact with the print table 1, the microswitch 5 is activated. had the disadvantage of requiring vertical position adjustment during assembly and adjustment.

The present invention was made to solve this drawback, and uses a pressure-sensitive rubber sheet in place of the rubber sheet 4, and further provides a flat electrode close to the top surface of the print table to form a pressure-sensitive strip. By this, the microswitch 5
The purpose of the present invention is to provide a simplified thermal printer printing device by eliminating the need for a thermal printer.

Hereinafter, one embodiment will be described based on the drawings.

FIG. 2a is a side view of a printing device of a thermal printer according to the present invention, and FIG. 2a is a perspective view of the printing stand.

In FIG. 2, flat electrodes 8 are provided in advance on the upper surface of both ends of the printing stand 1', and lead wires 9 are connected to the electrodes 8.

In FIG. 2a, when the thermal print head 3 supported by the leaf spring 7 is pushed from above, the pressure-sensitive rubber sheet 4' on the print stand 4' is pushed through the thermal paper 2, and the resistance of that part is pushed. As the value becomes smaller, a current flows between the flat electrodes 8 shown in FIG. 2, providing a signal indicating that the thermal print head 3 is pressed.

The thermal print head 3 is driven by this detection signal to print on the thermal paper 2.

That is, the pressure sensitive rubber sheet 4' brings about uniform contact between the thermal print head 3 and the thermal paper 2 due to its elasticity, and at the same time serves as a detection switch.

As described above with reference to an embodiment, the thermal printer printing device of the present invention uses a pressure-sensitive rubber sheet instead of a rubber sheet, which provides uniform contact and also functions as a detection switch. By installing a pressure-sensitive switch with a flat electrode close to the top surface, we can eliminate the conventional microswitch and simplify the printing mechanism, making it possible to create a thermal printer printing device with a small number of parts and no adjustment required during assembly. , its practical effects are great.

[Brief explanation of drawings]

Figure 1 is a side view of the printing device of a conventional thermal printer.
FIG. 2A is a side view of a printing device of a thermal printer showing an embodiment of the present invention, and FIG. 2A is a perspective view of a printing stand. 1.1'...Print stand, 2...Thermal paper, 3...Thermal print head, 4...
...Rubber sheet, 4'...Pressure sensitive comb sheet,
5... Micro switch, 6... Middle bar, 7... Leaf spring, 8... Electrode, 9...
····Lead.

Claims (1)

[Scope of utility model registration request] In a thermal printer-type printing device that prints by pressing a thermal print head against thermal paper on a print stand, detecting that the thermal print head is pressed against the thermal paper, and detecting that the thermal print head is pressed against the thermal paper, 1. A printing device for a thermal printer, comprising: a printing stand equipped with a pressure-sensitive rubber sheet serving as a mat for equalizing contact between the sheets and a detection section having a flat electrode operated by the pressure-sensitive rubber sheet.