JPH0516315U - Head pin breakage detection device for dot impact printer - Google Patents

Abstract

(57) [Summary] [Purpose] To detect head pin breakage quickly and reliably. A piezoelectric element 10 for converting a pressure received when the head pins 1 to 8 are advanced into a potential difference into a print head 9 which transfers ink of an ink ribbon 11 to a print medium 12 by advancing a large number of head pins 1 to 8 and detects it. Is provided, an abnormality occurs in the potential difference converted by the piezoelectric element 10 when no pressure is applied to the head pins 1 to 8, so that the head pin breakage is detected.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a head pin breakage detecting device used in a print head of a dot impact printer, and more particularly to a head pin breakage detecting device of a dot impact printer in which the printer itself detects the head pin breakage.

[0002]

[Prior Art]

 In general, a dot impact printer is designed to perform printing by advancing a large number of head pins provided on the print head to transfer the ink of the ink ribbon to a print medium.

Conventionally, in this kind of dot impact type printer, the head pin may be broken, but this head pin break detection method allows the human to see the result of actually printing one pin at a time and print it. When there was a part that was not done, it was judged that the head pin of this part was broken.

[0004]

[Problems to be solved by the device]

 However, in the above-described head pin breakage detection method for the conventional dot impact printer, since a person is supposed to judge by looking at the print result, it takes a long time for detection and an error in detection is likely to occur. There was a problem.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a head pin breakage detection device for a dot impact printer that can detect a head pin breakage quickly and reliably.

[0006]

[Means for Solving the Problems]

 In order to achieve the above object, the head pin breakage detection device for a dot impact printer of the present invention is a head pin for a print head in a dot impact printer having a print head for advancing a large number of head pins to transfer the ink of an ink ribbon to a print medium. The structure is provided with a piezoelectric element that converts the pressure received during the advance of the device into a potential difference and detects it.

[0007]

[Action]

 According to the head pin breakage detecting device of the dot impact printer having the above structure, the piezoelectric element converts the pressure of the head pin into a potential difference, and if there is no pressure on the head pin, the potential difference becomes abnormal, so that the head pin breakage is detected.

[0008]

【Example】

 Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a longitudinal sectional view showing a head pin breakage detecting device of a dot impact printer according to an embodiment of the present invention.

In the figure, reference numeral 9 denotes a print head, which is provided with a large number of head pins 1 to 8 that advance and transfer the ink of the ink ribbon 11 to the print medium 12.

Further, the head pins 1 to 8 built in the print head 9 are connected to a piezoelectric element 10 that converts pressure into a potential difference.

The voltage element 10 converts the pressure received when the head pins 1 to 8 advance to a potential difference and outputs it as an external signal 13.

Therefore, according to this dot impact printer, characters or the like are printed by moving the head pins 1 to 8 up and down, pushing the ink ribbon 11, and copying the ink for each dot onto the print medium 12. It is formed on the medium 12.

When performing this printing, the moved head pins 1 to 8 collide with the ink ribbon 11 to exert a pressure on the piezoelectric element 10. However, when the head pins 1 to 8 are broken, they do not collide with the ink ribbon 11, so that no pressure is applied to the piezoelectric element 10. Therefore, the breakage of the head pin is detected depending on the presence or absence of a potential due to the pressure applied to the piezoelectric element 10.

Next, a case where the head pin breakage test is performed will be described. First, move only headpin 1. If the head pin 1 is not broken, pressure is applied to the piezoelectric element 10. If the head pin 1 is broken, no pressure is applied to the piezoelectric element 10. The piezoelectric element 10 converts the presence or absence of pressure into a potential. As a result, the presence or absence of pressure (the presence or absence of breakage of the head pin) is output as a potential to the external signal 13. The potential level of the external signal 13 makes it possible to determine whether or not the head pin 1 is broken. After that, the head pins 2 to 8 are similarly tested one by one. By detecting the potential difference caused by the pressure applied to the piezoelectric element 10 as described above, the breakage of the head pin is detected.

[0015]

[Effect of the device]

 As described above, according to the head pin breakage detection device for a dot impact printer of the present invention, by connecting a piezoelectric element to the head pin, the head pin breakage can be detected easily, reliably, and quickly. is there.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a head pin breakage detecting device of a dot impact printer according to an embodiment of the present invention.

[Explanation of symbols]

 1-8 Head pin 9 Print head 10 Piezoelectric element 11 Ink ribbon 12 Print medium 13 External signal

Claims (1)

[Scope of utility model registration request] 1. In a dot impact printer equipped with a print head for advancing a large number of head pins to transfer the ink of an ink ribbon onto a print medium, a piezoelectric that detects the pressure received by the print head when the head pins are advanced by converting it into a potential difference. A head pin breakage detection device for a dot impact printer, which is provided with an element.