JP2738790B2 - Multi-stage bar code reader - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-stage bar code reader used in the distribution industry and the like.

[0002]

2. Description of the Related Art FIG. 4 shows a stationary two-stage barcode reader as an example of a multistage barcode reader. When the product A having the two-stage barcode shown in FIG. 5 is held over the reading window 1 of the two-stage barcode reader, the two-stage barcode is read by the laser emitted from the reading window 1. . The upper barcode and the lower barcode forming the two-stage barcode include a code indicating the upper barcode and a code indicating the lower barcode, respectively, and can be identified by the reader.

In such a configuration, conventionally, when only one of the upper and lower barcodes is read and the other barcode is not read, the barcode which has not been read is read until the other barcode cannot be read. The reading was repeated, and at the time of reading, the bar code data previously read and stored in the memory was sent as a pair of two-stage bar code data. That is, for example, if dust is attached to the upper barcode of the product A, the lower barcode is read and the upper barcode is not read, so the reading is repeated until the upper barcode is read. The upper barcode was read at the time of removal, and was sent out as a pair of two-stage barcode data with the lower barcode data stored in the memory at the time of first reading.

[0004]

However, if the operator holds the next B product over the next B product without noticing that the upper bar code of the A product could not be read, the two-stage bar code of the B product will be displayed. In some cases, the upper barcode was read and sent out as a pair of two-stage barcode data with the lower barcode data of the product of A which was previously read and stored in the memory. Since the upper and lower barcodes forming the two-level barcode do not include information on which barcodes are paired with each other, it is not possible to prevent the transmission of an incorrect combination of data by making a judgment by the device. Was.

[0005]

SUMMARY OF THE INVENTION According to the present invention, there is provided a bar code reading means for performing a repetitive reading operation, a plurality of read data storage means for writing bar code data read by the bar code reading means, and a multi-stage. An identification code storage unit in which an identification code for identifying a barcode is written; a collation unit for collating the identification code with barcode data written in the read data storage unit; A plurality of output data storage means for writing barcode data matching the identification code; an output means for outputting the barcode data written in the output data storage means; and a multi-stage bar for clearing the output data storage means. Initialization means for restarting code reading from the beginning, and bar code formation for forming multi-stage bar codes Reading in a preset during take processing time has more configuration and selection means for selecting the initialization means when not completed.

[0006]

According to the present invention, a plurality of bar codes forming a multi-stage bar code are sequentially read by the bar code reading means performing the repetitive reading operation, and the bar code data read by the bar code reading means is read. The collation means checks whether the bar code data written in the read data storage means which has been written and the content of which is constantly updated matches the identification code of the multi-stage bar code,
The matched barcode data is written to the output data storage means, and if there is at least one piece of matched data, the unmatched barcode data is repeated until it matches. If the collation is not completed within a preset time, the initialization means is selected by the selection means, the output data storage means is cleared, and the reading of the multi-stage barcode is started again.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS. This embodiment is applied to a stationary two-stage bar code reader which irradiates a laser from a reading window 1 to read a bar code, similarly to the conventional example shown in FIG. As described in the conventional example, the upper barcode and the lower barcode forming the two-stage barcode read by the two-stage barcode reader have a code indicating the upper barcode and a code indicating the lower barcode, respectively. However, in this embodiment, “21” is included in the upper two digits of the upper barcode as a code indicating the upper barcode, and “22” is included in the upper two digits of the lower barcode as a code indicating the lower barcode. Included in.

FIG. 2 is a block diagram of the present embodiment. The RAM 2 serves as storage means, a bar code reading control unit 3 serves as bar code reading means, a communication control unit 4 serves as output means, and the like. An LED control unit 5 and a buzzer control unit 6 for turning on an LED (not shown) or sounding a buzzer (not shown) to notify completion of reading the barcode;
A bus 10 includes a motor control unit 7 for controlling a motor (not shown) for rotating a polygon mirror (not shown) that reflects a laser, a laser control unit 8 for controlling laser oscillation, a ROM 9 in which programs and the like are fixedly written, and the like. It has a structure connected to the CPU 11. This CPU1
1 operates as initialization means, selection means, collation means and the like in accordance with the program written in the ROM 9.

In the RAM 2, as shown in the memory map of FIG. 3, read buffers 12 and 13 serving as read data storage means, output buffers 14 and 15 serving as output data storage means, and identification code storage means are provided. There are provided identification code storage units 16 and 17 in which an upper identification code “21” and a lower identification code “22” are written. The bar code reading control unit 3 serving as a bar code reading unit repeats the operation of irradiating the laser to read the bar code held over the reading window 1 and stores the bar code data of the read bar code in the read buffers 12 and 13. The contents are updated one after another.

In such a configuration, the upper and lower bar codes forming the two-stage bar code are sequentially read by the bar code reading control unit 3 performing the repetitive reading operation, and read by the bar code reading control unit 3. The bar code data written in the read buffers 12 and 13 in which the contents of the bar code data are written and the contents of the bar code data are constantly updated are compared with the identification code of the two-stage bar code by the matching means. The barcode data is written into the output buffers 14 and 15, and if there is at least one piece of matched data, the matching is repeated until the unmatched barcode data matches. If the collation is not completed within a preset time, the initializing means is selected by the selecting means, the output buffers 14 and 15 are cleared, and the reading of the two-stage barcode is restarted from the beginning. Here, a more detailed description will be given based on the control flowchart shown in FIG.

First, the upper two-digit code of the bar code data written in the read buffer 12 by the bar code read controller 3 and a code indicating the upper bar code are written.
21 "is determined to be the same (step 1).
First, a process in the case of YES is described, and then a process in the case of NO is described.

When YES is determined in step 1. The timer is started (step 2), and the bar code data written in the read buffer 12 is written in the output buffer 14 (step 3). Next, the upper 2 bits of the barcode data written in the read buffer 13 are read.
It is determined whether the digit code matches the code "22" indicating the lower bar code (step 4). If they match, the bar code data written in the read buffer 13 is written in the output buffer 15 (step 5). Then, the contents of the output buffers 14 and 15 are sent out by the communication control unit 4 (step 6), and the process returns. If they do not match, it is checked whether the timer has exceeded the preset time (approximately 300 msec) (step 7). If not, the process loops to step 4 and YES is determined in step 4 or step 7 The loop of (Step 4 to Step 7) is repeated until YES is satisfied.
The steps 4 and 15 are initialized (step 8), and the process loops to the first step 1 to read the two-stage barcode again from the beginning.

When the result of step 1 is NO. Code “22” indicating the upper two digits of the bar code data written in the read buffer 12 and the lower bar code
Are determined to match (step 9). If they do not match, the process proceeds to the one-stage barcode processing (step 10), and if they do match, the timer is started (step 1).
1) Then, the barcode data written in the read buffer 12 is written in the output buffer 14 (step 12). Next, it is determined whether the upper two-digit code of the bar code data written in the read buffer 13 matches the code "21" indicating the upper bar code (step 13). The written barcode data is written into the output buffer 15 (step 5), and the contents of the output buffers 14, 15 are sent out by the communication control unit 4 (step 6), and the routine returns. If they do not match, it is checked whether the timer has exceeded the preset time (approximately 300 msec) (step 14). Y
The loop from step 13 to step 14 is repeated until ES is established.
5 is initialized (step 8), and the process loops to the first step 1 to read the two-stage barcode again from the beginning.

As described above, in the present embodiment, the reading of the second bar code is repeated until the second bar code can be read until 300 msec elapses after the reading of the first bar code, but within 300 msec. If the second bar code cannot be read, the data in the output buffers 14 and 15 is initialized, and the process is restarted from the reading of the first bar code. Therefore, for example, it is assumed that the first bar reads the upper barcode of the product A, the second bar reads the lower barcode of the product B, and the barcode data is transmitted as a pair of two-stage barcode data. Become.

In this embodiment, the present invention is applied to a two-stage barcode reader for reading a two-stage barcode in which barcodes are superimposed in two stages. However, the present invention is not limited to this. The present invention can be similarly applied to a device for reading.

[0016]

According to the present invention, if the reading is not completed within a preset time during the reading process of the bar code forming the multi-stage bar code, the initializing unit is selected by the selecting unit, and the multi-stage bar code is read by the initializing unit. Because the barcode is read again from the beginning, the barcode of another product is read before all the barcodes that form the multistage barcode can be read, and the multilevel barcode is combined with the barcode of the other product. Bar code data is not erroneously transmitted.

[Brief description of the drawings]

FIG. 1 is a flowchart showing one embodiment of the present invention.

FIG. 2 is a block diagram.

FIG. 3 is a memory map of a RAM.

FIG. 4 is a perspective view showing a conventional example.

FIG. 5 is an explanatory diagram showing a two-stage barcode.

[Explanation of symbols]

 2 read data storage means 2 identification code storage means 2 output data storage means 9 bar code reading means 11 verification means 11 initialization means 11 selection means

Claims (1)

(57) [Claims] 1. A bar code reading means performing a repeated reading operation, a plurality of read data storage means in which bar code data read by the bar code reading means are written, and an identification code for identifying a multi-stage bar code. Identification code storage means written, collation means for collating the identification code with bar code data written in the read data storage means, and bar code data collated by the collation means and matched with the identification code , A plurality of output data storage means for writing bar code data written in the output data storage means, and an initial state in which the output data storage means is cleared and the multi-stage bar code is read again from the beginning. When the presetting is performed during the reading process of the barcode forming the multi-stage barcode. A multi-stage bar code reader comprising a selection means for selecting the initialization means when the reading is not completed within the interval.