JPH02167430A - Thermal head recorder - Google Patents

Abstract

PURPOSE:To prevent printing and recording from blurring by making the heat generation body of a thermal head to generate heat preliminarily up to temperature at which thermosensitive recording paper does not reach coloring temperature. CONSTITUTION:A power source substrate 5 supplies electric power to a printing control substrate 4 and the thermal head 1. A signal of the peripheral temperature of the head 1 which is detected by a temperature sensor 8 is sent to the temperature sensor read circuit of the substrate 4 and when the read value of temperature is lower than preset temperature, the head driving circuit of the substrate 4 supplies a current to the head 1 until the temperature below the coloring temperature of the thermosensitive recording paper 9 to hold the head 1 in the preliminary heat generation state. Further, a carriage 2 is moved to a graduation position of the recording paper 9 corresponding to the input signal value and the head driving circuit supplies a current to the heat generation body of the head 1 so that the recording paper 9 reaches the coloring temperature, thereby performing printing and recording operation. At this time, the heat generation body generates heat preliminarily, so the coloring temperature of the recording paper 9 is reached instantaneously, so the printing and recording never blurs.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention is directed to an industrial application which has a thermal head for printing and recording and uses thermal paper as recording paper.

Regarding recorders for laboratory use, etc.

(Prior art) Conventional thermal bed recorders run current through the heating element of the thermal head to generate heat only when printing or recording, so if the ambient temperature of the thermal head is low, recording It takes time for the heating element to reach the coloring temperature of the paper. As a result, the thermal head moves to the next printing or recording location without the heating element generating enough heat to print.

There was a problem that the records were blurred.

(Problems to be Solved by the Invention) An object of the present invention is to realize a thermal head recorder that does not cause blurring of printing or recording even when the temperature around the thermal head is low, and the purpose of the present invention is also to solve this problem. be.

[Structure of the invention]

(Means for Solving Problem 1) The thermal head recorder of the present invention is provided with a temperature sensor that measures the temperature near the thermal head, and when the temperature measured by this temperature sensor is below a certain value, It is configured to pass a current through the heating element of the thermal head to preheat it to a temperature at which the thermal paper removal does not reach the coloring temperature.

(Function) In the thermal head recorder of the present invention, the heating element of the thermal head generates heat to a temperature that does not reach the coloring temperature of the thermal recording paper, so even if the ambient temperature of the thermal head is low, recording and printing are possible. When the current flows, the heating element instantly reaches the coloring temperature of the heat-sensitive recording paper, so printing and recording will not be blurred.

(Example) Hereinafter, the present invention will be described in detail based on the example shown in the drawings.

FIG. 1 shows the recording section and surroundings of a thermal bed recorder according to an embodiment of the present invention. The carriage (2) to which the thermal head (1) is attached is guided by two shafts (3) and is moved in the horizontal direction as shown in the figure by a carriage motor (not shown) via a transmission mechanism such as a reeling line. It has become. Further, the carriage (2) is connected to a fixedly arranged print control board (4) by a flexible board (6).

The printing control board (4) is a fixedly arranged power supply board (5)
is connected to by a flexible board (7).

In addition, a temperature sensor (8) is installed near the thermal head (1).
) is attached to the carriage (2) and arranged,
This temperature sensor (8) is also connected to the print control board (4) via the flexible board (6). (9) is thermal recording paper, which is fed in the direction of the arrow.

In the thermal head recorder of the embodiment of the present invention configured as described above, the power supply board (5) is the print control board (5).
4) Supply power to the thermal head (1). The temperature signal near the thermal head (1) detected by the temperature sensor (8) is sent to the temperature sensor reading circuit of the printing control board (4), and if the temperature reading is below a preset temperature, printing starts. The head drive circuit of the control board (4) passes a current through the heating element of the thermal head (1) to a temperature that does not reach the coloring temperature of the thermal recording paper (9), thereby increasing the temperature of the thermal recording paper (9). The head (1) is maintained in a preheated state. In addition, the carriage (2) is moved to the scale position of recording/removing paper corresponding to the input signal value, and the head drive circuit causes the thermal recording paper (9) to reach the coloring temperature by the heating element of the thermal head (1). Printing and recording are performed by passing an electric current, but at this time the heating element is preheating, so it instantly reaches the coloring temperature of the thermal recording paper.
Printing and recording will not be blurred.

As described above, according to the thermal head recorder of one embodiment of the present invention, printing and recording without blurring can be obtained even at low ambient temperatures.

Note that the temperature sensor (8) is not limited to the location shown in the drawing, but may be incorporated into the thermal head (1), for example.

〔Effect of the invention〕

As detailed above, according to the present invention, in a thermal head recorder, the heating element of the thermal head is preheated to a temperature that does not reach the coloring temperature of the thermal recording paper, so that the ambient temperature of the thermal head can be increased. Even if it is low,
When a current is applied to the thermal head to print or record, the heating element instantly reaches the coloring temperature of the thermal recording paper.
Print.

Records will not be blurred.

[Brief explanation of the drawing]

FIG. 1 is a schematic perspective view showing the area around the recording section of a thermal head recorder according to an embodiment of the present invention. l... Thermal head 2... Carriage 4.
...Print control board 5...Power supply board 8...Temperature sensor 9...Thermal recording paper agent Patent attorney Norio Ogo

Claims (2)

[Claims] (1) A thermal head recorder that prints and records on thermal recording paper using a thermal head, in which a bed drive circuit is provided with a function to preheat a heating element of the thermal head. (2) It has a temperature sensor that measures the temperature near the thermal head, and when the temperature measured by this temperature sensor is below a certain value, the heating element of the thermal head prevents the thermal recording paper from reaching the coloring temperature. 2. The thermal head recorder according to claim 1, wherein a current is passed through the thermal head recorder at a certain level.