JPS5826070B2 - Barcode recording device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a recording device for barcode symbols for common product codes, and particularly to extending the life of a recording head.

The barcode symbol is binary ``Q I+, l 91
A white bar and a black bar correspond to each other, and one character is displayed using several bits.

Common product code barcode symbol used in supermarket POS systems (JIS B95
50) displays decimal numbers O to 9 using 7 bits, or 7 dots, and the dot configuration is from the left to 3 of the guard bar.
dots, 42 dots for the 6 characters on the left,
5 dots on the center bar, 42 dots for the 6 characters on the right side, and finally a dot on the guard bar, total 9
It is made up of 5 dots.

The code corresponding to each product is displayed using the above 95 dots, and the 6 characters on the left side are shown in Figure 1a.
Two types of parity are used: odd parity and even parity, as shown in FIG.

When recording the barcode symbols of various products, if the frequency of appearance of Kirafters from O to 9 is the same, the probability that a black bar will be recorded for each dot is shown at the bottom of Figure 1 a and c. Like I did, 0%, 40%.

There are four types: 60% and 100%.

Further, the left and right guard bars and the center bar are common to each product, and there are two probabilities of recording a black bar as shown in d and e of FIG. 1: 0% and 100φ.

In conventional barcode symbol recording, each element of the recording head uniquely corresponds to the 95 dots, so the recording element where the probability of recording the black bar is 0%. The recording head does not always operate even when recording various products, and the recording element at 100% always operates, causing an imbalance. determined by the current recording element.

In the present invention, by shifting the recording operation state shown in FIG. 2A by one dot or another odd number of dots as shown in the same figure, the operation probability of the recording element can be approximately changed over each element as shown in FIG. 2C. The aim is to average the life of the recording head by 30% or more.

Incidentally, FIG. 2d is a legend showing the black bar recording probability in FIG.

A specific embodiment of the present invention will be described below with reference to FIG.

A bar pattern generator and a recording element are elements that constitute a conventional recording device, but a recording number counter, a comparison section, a shift switch, and a switch driving section are newly added here. Once the arrangement of the bars and black bars is determined, a recording start signal is input and one sheet of recording is performed.

At the same time, a recording start signal is sent to the record number counter, and the number of records recorded up to that point is accumulated.

In the comparison section, a set number indicating how many sheets to shift the recording element every time is entered in advance, and is compared with the cumulative number of the recorded sheet counter. When this reaches the set number, a signal is sent to the switch drive section. Flip the feed shift switch and clear the recording number counter at the same time.

Through the above-described operation, the present recording device repeats shifted and non-shifted recording every set number of times, and in accordance with the gist of the present invention, the operation probability of the recording elements is averaged, and the life of the recording head can be extended. be.

Although FIG. 3 shows the case of shifting by one dot, the same effect can be obtained by shifting other odd numbers.

Furthermore, although FIG. 3 shows a system in which shifting and non-shifting are automatically repeated for every fixed number of sheets, the effects of the present invention can also be obtained even if only a manual shift switch is provided and the switch is periodically reversed. be.

[Brief explanation of drawings]

FIG. 1 shows a part of the arrangement of white bars and black bars, and the arrangement of guard bars and center bars for numbers from 0 to 9 in the lO inverse system, and also shows the probability of appearance of the black bar for each dot. FIG. 2 is a diagram showing that the appearance probability of a black bar is averaged when shifted by one dot, and FIG. 3 is a diagram showing a specific configuration example of the bar code recording apparatus of the present invention. Here, 1 is the character's white bar, black bar arrangement 1,
2 is a percentage indicating the appearance probability of a black bar, 3 is an arrangement of guard bars and center bars, 4 is a guard bar, 15 is a character bar, and 6 is a center bar.

Claims (1)

[Claims] 1. In the recording device for bar code symbols for common product codes, the number of dots on the recording head is 2n-1 less than the specified number.
A barcode recording device characterized in that the barcodes are arranged in an increasing number of 2n-1 dots (where n is a positive integer) or more, and normal recording and recording shifted by the 2n-1 dots are alternately performed.