JPS58221468A - Reading device - Google Patents

Abstract

PURPOSE:To prevent duplicate reading using a simple mechanism, by comparing previously read bar code with subsequently read bar code and if they coincide, annuling the subsequently read bar code. CONSTITUTION:Previously read bar code data are stored in a secondary buffer 12. Subsequently read bar code data is supplied to a comparator section 13 through a primary buffer 11, and compared with previously read data. When they are different, subsequently read bar code data is transferred to a host computer. When they coincide, previously read bar code data is erased without transferring to the host computer.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to a reading device for reading a barcode printed on a medium, and particularly to an improvement of a reading device with a simple mechanism.

(b) Background of the technology Recent spread of combiator network systems R: B1 Point of sale information management system A (Point of 5afe) at part-time stores, supermarkets, etc.
st: hereinafter referred to as PO8) has become widely adopted. Electronic registers and stationary readers are used as terminals in POS systems. These terminals are installed at payment counters and are operated by store clerks and other operators to read barcodes printed on product labels. The product number, product name, product price, etc. are included in the 0 barcode. When the barcode is read, the prices are sequentially displayed on the electronic register, and finally the total price is displayed by pressing a button.

In addition to the register function, this terminal also plays a role as a data input device for an information management system that sends sales information for each product online one by one to a computer center and performs general product management such as sales aggregation, inventory management, and purchase management. It is becoming.

Therefore, consideration must be given to the reading device to perform accurate reading so as not to degrade the service to customers or impede the efficiency of the POS system due to reading errors, 2fi reading, etc.

(C) Technical and Problematic Problems Below, we will explain the conventional method by taking a stationary reader used in a POS system as an example and referring to Figs. 1 and 2. Fig. 1 shows the present invention. Applicable thread? 2 is a side view illustrating the loading device, FIG. 2 is a perspective view showing the reading section of FIG. 6g1, and FIG. 3 is a timing chart of FIG. 2.

As shown in FIG. 1, the reading device 1 is equipped with an optical unit 2 and a recognition section 3 inside, and the optical unit z is equipped with a radiator installed in the upper part where light emitted from a laser tube (not shown in the figure) is emitted. It has a light emitting function of emitting a laser beam from the window 4, and a sensor function of scanning a bar code of an object outside the device with the emitted laser beam and reading the reflected light. The recognition unit 3 has a function of recognizing the signal read by the sensor as data. A shutter (not shown) is provided on the front surface of the optical unit 2.

A reading window 5 covered with a glass plate is provided on the upper surface of the apparatus, and light emitted from the radiation window 4 is emitted from the reading window 5 as shown by a chain double-dashed line in the top view of the apparatus. Reading device 1
Front and rear stands 6 and rear stands 7 are located on the right and left sides of the figure.
are arranged, a basket full of products 8 is placed on the front table 6, and an empty basket is placed on the rear table 7.

Further, as shown in FIG. 2, transmission type sensors 9 and 10, which are 2 m long in front and back to detect the product 8, are installed on the side of the reading window 5 of the reading device 1, in front and behind the direction in which the product 8 is moved. is,
Constant light emitting element 9a, LOaj: Light receiving element 9b, 10b
The source is output to

With such a configuration, the operator takes out the products 8 one by one from the basket on the front table 6, points the barcodes of the products 8 downward, and scans the predetermined space above the reading window 5 in the direction shown by the arrow in the figure. When the product 8 is passed through, the front transmissive sensor 9 detects the product 8, the shutter opens as shown in FIG. Display barcode data on the electronic register display.

Next, when the rear transmission type sensors 1 and 0 detect the product 8, the shutter closes and the product 8 is placed in the basket on the rear stand 7. When it passes through the no-type sensor 10, it is detected but not read. This is one product 8 to 2
This is to avoid reading too much.

However, this reading device 1 is equipped with two sets of transparent sensors 9 and 10, and also has a shutter and its opening/closing mechanism on the front of the optical unit 2, so the structure is complicated and the cost is high. It has the disadvantage of being .

(d) Purpose of the Invention The purpose of the present invention is to solve the above-mentioned drawbacks, and to provide a reading device which has a simple mechanism and can prevent double reading. A comparison section is provided to compare the read barcodes, and the comparison section compares the previously read (-) code with the barcode read later, and when they match, invalidates the barcode read later. Embodiment of the Invention Hereinafter, an embodiment of the present invention will be described with reference to FIG. 4, Q-th φ width.

In FIG. 4, 11 is a primary buffer, 12 is a secondary buffer, 13 is a comparison section, and the primary buffer 11 is a bar from the recognition section 3 that has been read within a predetermined time since the previous reading. It has a function of temporarily holding the code data and sending the barcode data to the secondary buffer 12 and comparison section 13 according to the command from the control section 14. The secondary buffer 12 holds the barcode data from the primary barcode 11 for a predetermined period of time, and erases it under the control of the control unit 14 after the predetermined period of time has elapsed.
It also has a function of sending the code data to the comparator 13 within a predetermined period of time according to a command from the control section 14. The comparison unit 13 compares the primary buffer 11 with the command from the control # unit 14.
It has a function of comparing the barcode data sent from the secondary buffer 12 and the barcode data sent from the secondary buffer 12, and sending the result of whether or not both data match to the control unit 14. The control section 14 controls each section and, based on the comparison result sent from the comparison section 13, instructs the recognition section 3 as to whether or not to send host combinator heparcode data (not shown). 0 and the transparent m-cleft sensor 9 on the top surface of the reader 1. l
O and the shutter mechanism on the front of the optical unit 2 have been removed.

With such a configuration and function, when reading the barcode of the product 8, when the power is turned on to the reading device 1, a laser beam is constantly emitted from the optical unit 2, and the product 8 is placed in the reading window 4. Reading is performed by passing the light above.

At this time, in FIG. 4, the previously read barcode data is stored in the secondary buffer 12, and the next read barcode data is passed through the primary buffer 11 and combined with the previously read barcode data. Comparison unit 13 compares the data, and if there is a difference, the data is transferred to the host computer.Then, it is displayed on an electronic register (not shown).If the compared barcode data is a code, the next barcode read is Code data is erased without being transferred to the host converter.

In this way, by omitting the transmission area centers 9 and 10 and the shutter mechanism, it is possible to read the product 8 when it passes from any direction, but it is also easy to be read twice when the product 8 is operated. 2Ji reading can be prevented by comparing the barcode data read before and after.

(g) As described in detail, according to the present invention, not only is the cost improved because a permeated acid sensor and a shutter mechanism are not used, but there is also the effect of preventing double reading. The re-reading operation when the item cannot be read is unrelated to the direction of movement of the product, so it has the effect that it is only necessary to go back.

[Brief explanation of the drawing]

FIG. 1 is a side view illustrating a reading device to which the present invention is applied, FIG. 2 is a perspective view showing the reading section of FIG. 1, and FIG.
FIG. 4 is a block diagram showing an embodiment of the present invention. In the figure, 1 is a reading device, and 2 is an optical unit. 3 is a recognition unit, 5 is a reading window, 8 is a product, 9.10 is a transmission area sensor, 11 is a 1m buffer, 12 is a secondary buffer,
13 is a ratio l1I12 section, and 14 is a control section. 1 Figure 1 Figure 2 Akira 5 Figure 4 Layer 4

Claims (1)

[Claims] A reading device that has an optical unit and a reading window located in front of the light source of the optical unit, allows a medium on which a barcode is printed to pass through a predetermined space above the reading window, and reads the barcode on the medium. , a comparison section is provided for comparing the read barcodes, and the comparison section compares the previously read barcode with the barcode read later, and invalidates the barcode read later when encoding. A reading device characterized by: