JPS62179978A - Ribbon breakage detecting mechanism - Google Patents

Abstract

PURPOSE:To easily detect the breakage of an ink ribbon on the ribbon take-up side, by providing a roller for supplying an electric current to the ink ribbon and a sensor on the ribbon take-up side. CONSTITUTION:A current-passing roller 2 and a grounding roller 4 are provided between a printing head 1 and a ribbon taking-up part 6, and an ink ribbon 3 is fitted in contact with them. A voltage V1 is applied from a power source 9 to the roller 2, and a sensor 8 for detecting an electric current is connected to the roller 2. In normal direction, the current flows through the roller 2, the ink ribbon 3 and the roller 4 to ground, and id detected by the sensor 8. When the ink ribbon 3 is cut between the roller 4 and the roller 2, no electric current flows, so that no current is detected by the sensor 8. Accordingly, the breakage of the ribbon 3 can be recognized.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field 1] The present invention relates to a ribbon breakage detection mechanism, and particularly to a ribbon breakage detection mechanism on the ribbon winding side of a resistive ribbon type printing device.

Conventional technology] Conventionally, this type of ribbon breakage detection mechanism has a structure in which a sensor detects when the ink ribbon fed out from the printing section has slackened to a certain amount, and winds up the slackened ink ribbon. When ribbon breakage occurs, the sensor detects that the ink ribbon is in a slack state, and the ribbon breakage is recognized based on the length of the detection time and other factors.

[Problems to be Solved by the Invention, 1] A series of conventional printer LIJ breakage detection mechanisms utilize the slack V of the ink ribbon, and ribbon breakage is detected by the length of time the slack is left. Because there are
There are disadvantages in that the number of mechanical parts is large and the configuration is complicated.

1. Means for solving the problem, 1. The glue cutter detection mechanism invented by Moku is capable of printing on paper via a resistive ink ribbon and a 3A ink ribbon.
a ribbon feeding section and a ribbon winding section for feeding and winding the ink ribbon, a surface marking provided between the print head and the ribbon winding section, and an energizing roller for tensioning and guiding the ink ribbon. and a grounding roller, a power supply that supplies voltage to the energization roller and causes a current to flow through the ink ribbon and the surface-to-surface grounding roller, and a power source that is provided between the power supply and the energization roller and the energization roller and the and a sensor unit that detects that no current is flowing between the ink ribbon and the grounding roller and recognizes that the ink ribbon has been cut.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of the present invention. In this embodiment, printing is performed using a printing press 1, an energizing roller 2, a resistive ink ribbon 3, and a grounding roller 4. Ribbon feeding section 5, ribbon winding section 6, guide roller 7, sensor 8, and power source 9f
i-I have it.

The print head 1 that lines up and prints on the platen 1 ( ) via the resistive ink ribbon 3 , the ribbon feed section 5 that feeds out the ink ribbon 3 and guides the winding edge, the ribbon winding section 6 , and the guide roller 7 are common. It has the same configuration as the printing mechanism. In this embodiment, an energizing roller 2 and a grounding roller 4 are further provided between the print head 1 and the ribbon winding section 6, and the ink ribbon 3 is stretched around these rollers. Note that arrow A indicates the running direction of the ink ribbon 3.

A voltage of ■1 is applied to the energizing roller 2 from the power source 9,
A sensor 8 is connected to detect the current. The applied voltage V1 is configured to flow from the energizing roller 2 through the ink ribbon 3 to the grounding roller 4.

Next, the operation of the present invention will be explained. Under normal conditions, current flows to the ground through the energizing roller 2, ink ribbon 3, and grounding roller 4, and the current is detected by the sensor 8. and energizing roller 2
When the ink ribbon 3 is cut between the two, the current stops flowing, and therefore the sensor 8 does not detect the current, thereby making it possible to recognize that the ink ribbon 3 has been cut.

〔Effect of the invention〕

As described above, the present invention has the effect of easily detecting breakage of the ink ribbon on the ribbon winding side by providing a roller that energizes the ink ribbon and a detection sensor on the ribbon/winding side.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention. ■...Print head, 2...Electrifying roller, 3...
Ink ribbon, 4... Ground roller, 5... Ribbon sending section, 6... Ribbon winding section, 7... Guide roller, 8... Sensor, 9... Power supply, 10...・
platen cow 1 concave

Claims (1)

[Claims] A resistive ink ribbon, a print head that prints on paper via the ink ribbon, a ribbon feeding section and a ribbon winding section that feed and wind the ink ribbon, and the print head and the ribbon winding section. an energizing roller and a grounding roller provided between the ink ribbon for tensioning and guiding the ink ribbon; a power source for supplying voltage to the energizing roller and passing a current through the ink ribbon and the grounding roller; A sensor section is provided between the energizing roller and the grounding roller, and detects that no current is flowing between the energizing roller and the grounding roller, thereby recognizing cutting of the ink ribbon. Ribbon cut detection mechanism.