JPS5914214Y2 - Ribbon defect detection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for detecting defects such as ribbon tears, and in particular, the ribbon according to the present invention relates to an ink ribbon for printing with a printing device by soaking ink in the ribbon.

In printers such as line printers that use ink ribbons for printing, the ink ribbons installed in the device are used repeatedly, but the ribbons deteriorate in proportion to the number of times they are used, and phenomena such as tearing occur.

If an ink ribbon with such tears is used, desired printing cannot be obtained.

Therefore, it is necessary to replace the ink ribbon when it is torn.

Conventionally, an operator visually observes the actual condition of the ink ribbon to determine when to replace the ink ribbon.

However, this visual judgment is not only troublesome, but also involves individual differences among operators, making it difficult to use the ink ribbon efficiently.

The purpose of the present invention is to eliminate the above-mentioned drawbacks and provide an ink ribbon defect detection device that eliminates the need for the operator to make a cumbersome judgment on when to replace the ink ribbon and enables efficient use of the ink ribbon. .

According to the present invention, this purpose is to provide a nobon running detection roller in the ribbon running path, and a detector that detects when the ribbon running detection roller has stopped rotating. A ribbon defect detection device for detecting a defect in an ink ribbon due to the occurrence of a defective ink ribbon, wherein a comb-like claw is provided in the ribbon running path to fit into a torn hole in the ribbon and forcibly stop the running of the ribbon. This is accomplished by a ribbon failure detection device.

Next, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a diagram showing an outline of a line printer embodying the present invention.

In the figure, a printing paper 1 and an ink ribbon 2 are interposed between a type belt 3 rotating at a constant speed, a hammer and a magnet 4, and the hammer 4 is excited by the magnet, and the printing paper 1 is applied to the type on the type belt 3. When pressed, the ink moves from the ink ribbon 2 to the printing paper 1 and prints in color.

The printing paper 1 is fed in the vertical direction of the drawing to perform line breaks.

The ink ribbon 2 moves endlessly in the direction of the arrow.

That is, the ink ribbon 2 is stored in a ribbon cassette 5 as shown in the figure, and as the printing operation progresses, it is moved by the drive roller 6 in the direction of the arrow and rotated by the pressure contact member 7 while maintaining a desired tension in the printing section.

The ink ribbon 2 is a fabric made of silk or nylon impregnated with ink, and the ink is applied to the printing paper 1 for each print.
metastasizes to.

In this way, the ink ribbon 2 is connected to the hammer 4 and the type belt 3.
Take a hit with the printed word.

Therefore, as the number of times of printing increases, the ink ribbon 2 deteriorates and tears occur.

This tear in the ink ribbon 2 is caused by each roller 8, 8', 8"
This is a serious drawback in that it not only wraps around the paper, but also makes printing impossible.

Therefore, according to the present invention, a comb-like claw 9 is provided in the ribbon cassette 5, and if the ink ribbon 2 is torn, the tear of the ink ribbon 2 is caught on the claw to force the movement of the ink ribbon 2. When the ink ribbon running detection roller 10 stops rotating, a detector 11 detects that the ink ribbon 2 has stopped running, and outputs an alarm signal 12.

FIG. 2 is a diagram showing an example of the shape of the comb-like claws 9. As shown in FIG.

The ink ribbon 2 runs in the direction of the arrow, and if the ink ribbon 2 is torn, the claw 9 is pressing against the ink ribbon 2, so the claw 9 fits into the ink ribbon 2 and stops running. This is what I did.

In reality, the effect is greater if there are more than one claw.

As described above, since the present invention has the above-mentioned configuration, the operator is freed from the trouble of visually determining whether the ink ribbon is torn, and the appropriate replacement time is automatically displayed, eliminating the need for individual differences. This makes it possible to use the ink ribbon efficiently.

In the present invention, it is also possible to select and detect the size of the tear in the ink ribbon 2 by changing the shape of the claw 9.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an outline of a line printer embodying the present invention, and FIG. 2 is a diagram showing an example of the shape of the comb-like claws. Furthermore, in the figure, 1 is printing paper, 2 is ink tip, 3 is type belt, 4 is hammer (including magnet), 5
is a ribbon cassette, 6 is a drive roller, 7 is a pressure contact member, 8
．． 8' and 8'' are rollers, 9 is a comb-like claw, 10 is an ink ribbon running detection roller, 11 is a detector, and 12 is an alarm signal, respectively.

Claims (1)

[Scope of utility model registration request] A ribbon running detection roller is provided in the ribbon running path, and a detector is provided to detect when the rotation of the ribbon running detection roller has stopped, and the detector detects a defective ink ribbon when the ribbon has stopped running. The ribbon defect detection device is characterized in that a comb-like claw is provided in the ribbon running path to fit into a torn hole in the ribbon and forcibly stop the ribbon running. Device.