JPH082652B2 - Dot impact printer - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a dot impact printer that performs printing with a dot impact print head having dot pins.

2. Description of the Related Art The conventional dot impact printer does not have a printing pressure detecting means for detecting the printing pressure by the dot pin. Therefore, until the print result was actually confirmed, it was not possible to find a problem such as a print blur due to insufficient print pressure, a defect in the driver circuit of the dot pin of the print head, or a drop due to damage of the dot pin.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a dot impact printer which has no print blur, can detect problems such as missing dots before printing, and can always keep the same print result.

The dot impact printer according to the present invention comprises a dot impact print head having dot pins, a platen for receiving the dot pins, a print pressure detection mechanism for detecting the print pressure by the dot pins, and the detected print pressure. And a spacing control mechanism for controlling the distance between the dot pin and the platen according to the above.

Embodiment Next, the present invention will be described in more detail with reference to the drawings showing an embodiment of the present invention.

Referring to FIG. 1, a dot impact printer according to an embodiment of the present invention is provided in parallel with a guide shaft 2 and a dot impact print head 1 having a plurality of dot pins and moving on a spacing guide shaft 2. The print head 1 includes a platen 3 for receiving the dot pins of the print head 1, and a print pressure detection mechanism 4 fixed to the housing 5 near the platen 3 to detect the print pressure of the dot pins of the print head 1.

Immediately after turning on the power of the dot impact printer or before starting the printing operation, the print head 1 moves to the position of the print pressure detection mechanism 4 and projects the dot pin to apply pressure. The print output detection mechanism 4 generates a print pressure signal which is an electric signal corresponding to the print pressure. This printing pressure signal is supplied to a printing pressure control circuit (FIG. 2) that controls the printing pressure of the dot pins of the print head 1.

Referring to FIG. 2, the print pressure control circuit includes an amplifier 6 for amplifying a weak print pressure signal from the print pressure detection mechanism 4.
And an A / D converter 7 for converting the signal level of the amplified print pressure signal into digital data, and a CP for processing the input digital data (print pressure data) and generating a print pressure control signal.
Have U8 and.

CPU8 processes the printing pressure data represented by the printing pressure signal.
Although the means connected to the CPU 8 is controlled, when the connected means is the display means, an alarm is displayed if the printing pressure has not reached the specified value. If the connecting means is a mechanism for adjusting the distance between the dot pin of the print head 1 and the platen 3, the distance is controlled in response to the printing pressure data so that the optimum printing state can be obtained. It is also possible to perform control such as one-way printing (two-pass printing) with the print head.

As described above, in the dot impact printer according to the present invention, by providing the print pressure detection mechanism for the dot pin of the print head, before the print result is output, print faint or print due to insufficient print pressure occurs. Problems such as missing dots due to defective dot pin driver circuits on the head or damage to the dot pins can be found in advance, and printing pressure correction and missing dot correction can be performed based on this information to ensure continuous printing. It is possible to keep the results the same.

[Brief description of drawings]

FIG. 1 is a schematic plan view of an embodiment of the present invention, and FIG. 2 is a block diagram of a printing pressure control circuit. Description of main part code 1 …… Dot impact print head 3 …… Platen 4 …… Print pressure detection mechanism

Claims (1)

[Claims] 1. A dot impact print head having a dot pin, a platen for receiving the dot pin, a print pressure detection mechanism for detecting a print pressure by the dot pin, and the dot pin according to the detected print pressure. A dot impact printer, comprising: a gap control mechanism for controlling a distance between the platen and the platen.