JPS5812259Y2 - character reading device - Google Patents

Description

[Detailed description of the invention] The present invention relates to the improvement of a high-speed character reading device that optically scans and reads characters on paper with line marks, and in particular extracts recognition areas based on line marks. .

Conventionally, a high-speed method uses paper with line marks, detects the line marks, stops the relative movement between the reading head and the paper, and optically scans the information on the paper with the reading head. Character reading devices are widely used.

The positioning of the reading head with respect to the line mark is normally performed by rough positioning based on position information and then fine mechanical adjustment.

In this case, positioning using position information can be performed at high speed, but
The disadvantage of mechanical fine adjustment is that it takes time.

In response to this, the present applicant proposed a method of omitting mechanical fine adjustment in Japanese Patent Laid-Open No. 51-38836.

That is, in this proposal, only positioning is performed using position information, and the fine adjustment process is omitted.

Even with such rough positioning, the reading head is provided with a sufficiently wide scanning height to be able to completely scan only the characters in a desired line.

From the scanning area of this scanning signal, only a recognition area determined based on the line mark, for example, a predetermined area centered around the detection address of the line mark, is extracted.

This configuration makes it possible to obtain the same effect as fine adjustment.

This proposal makes it possible to effectively position the reading head with respect to line marks during high-speed character reading, but if this recognition area is set and the relative movement between the reading head and paper is stopped, these devices Due to the inertia of the driver and the characteristics of braking mechanisms such as clutches and brakes, a positional deviation occurs before the motor completely stops, and the amount of this deviation may exceed a permissible range.

An object of the present invention is to provide a character reading device that extracts a recognition area based on line marks from a character scanning signal and further corrects and sets a positional shift after stopping.

In order to achieve the above object, the character reading device of the present invention stops the operation of the driver that moves the reading unit relative to the paper by detecting line marks on the paper, and the reading unit moves from that point on. The relative movement amount between the paper and the paper is detected by a count value obtained by counting pulses from a pulse generating means provided in the driver with a counter, and recognition is performed based on the line mark extracted from the scanning signal from the detection result. The feature is that the area is corrected.

The present invention will be described in detail below with reference to examples.

FIGS. 1A to 1D are explanatory diagrams of the principle of the present invention.

In the present invention, a code plate is attached to a driver that moves paper relative to a reading head, and an optical sensor detects light pulses obtained through slits provided at equal intervals around the code plate.

When a line mark is detected in the read head, the information control device (
A control signal is operated via the CPU (CPU) to stop the driver.

However, as described above, from that point on, positional deviation occurs due to the braking mechanism, etc., and the code plate generates pulses with gradually wider intervals.

This state is shown by the relationship between the pulses from the code plate shown in FIG. 4A and the driver control signal shown in FIG.

In order to correct this positional deviation, a counter gate as shown in FIG. 6C is made and counted especially for the pulses after the pulses are stopped.

The rising edge thereof is made to coincide with the rising edge of the driver control signal shown in FIG. 5, and the falling edge thereof is limited by the timer setting value which makes the interval between pulses from the code plate sufficiently long as shown in FIG.

Based on the count value through the counter gate obtained in this way, a character recognition image can be obtained by further correcting the recognition area (based on the down line mark in the above-mentioned proposed example).

FIG. 2 shows an example of a mechanical configuration of an embodiment of the present invention based on the principle shown in FIG. 1, and FIG. 3 shows an example of its control circuit.

In FIG. 2, a sheet of paper 1 is fed in the direction of arrow 6 by a driver 20 which is laterally mounted on a path 5. In FIG.

Line marks 2 are attached to the side edges of the paper 1, and characters 3 are printed around the line marks.

Reading head I for scanning and reading this character 3 in the row direction
A head block 7-1 is supported through the drive shaft 8, and a light source γ-2 and a light sensor γ-3 are provided on the paper side.

The end of the drive shaft 8 is rotated by a drive pulse motor 10 via a pulley and belt drive system 9.

A code plate 11 is fixed coaxially with the drive shaft 8, and address control for the reading head 1 is performed by an optical sensor (not shown).

On the other hand, the driver 20 that drives the paper 1 in the feeding direction 6 includes the essential parts of the present invention.

In other words, the driver 20 BOOM! A driving pulse motor 16 is connected directly to the pulley 13, with the edge of the paper 10 sandwiched between the belt 14 stretched between J12 and J13 and the feed roller 15.
Driven by.

A code plate 1T is fixed coaxially with the pulley 12, and an optical sensor 18 sends a pulse to a pulse generator 24 for feeding the paper.
Sent via .

This is used as a pulse indicating the positional deviation in FIG. 1g.

In addition, the belt 1401 has a clutch and a brake 2 which will be described later.
3 is provided, and braking is performed by detecting the row mark.

FIG. 3 uses the configuration of FIG.
This is a control circuit to which 38836 is applied.

In the figure, the detection signal of the line mark detection section 21 is detected by the CPU 2.
2, and the drive device 20 is controlled to stop by the mechanism control unit 23 for the clutches, brakes, etc. described above.

Even if this mechanism control section 23 operates completely, the belt 14,
Inertia remains in the feed roller 15, etc., and a small amount of positional deviation is inevitable.

So code board 17. Optical sensor 18, pulse generator 2
4, a pulse train with increasingly longer pulse intervals as shown in FIG. 1g is extracted.

This pulse train signal is input to the AND circuit 25 and the CPU 2
The pulse counter 27 starts counting by the mechanism control signal No. 2, and is reset after a certain period of time by the timer 26.
The counter gate in Figure C is created.

The counted value at the time of reset, that is, this value corresponding to the amount of deviation of the reading head T from the line mark, is stored in the area determining circuit 31 consisting of a register, and this counted value is sent to the permissible range determining circuit 28 where it is determined as the limit value 29. If the number is too large, it is indicated on the display 30 that there is a failure in the mechanism control unit 23.

At the same time, the count value stored in the area determining circuit 31 is canceled.

If the count value n is within the allowable range, a gate signal as shown in FIG. 1e is sent out based on the value.

The gate signal becomes one input of the AND circuit 34,
The output of the video signal memory 33 that stores the read signal of the scanning section 32 is input to the other input of the AND circuit.

The video signal stored in the video signal memory 33 has a 128-bit configuration as shown in FIG. .

Line mark 2 exists between the m1 bit and m2 bit.

The values of ml and m2 change depending on the value of the count value n, but the interval width is constant, for example, 80 bits, and does not change depending on the count value n.

The output of the AND circuit 34, ie, the character image shown in FIG. 1g, is input to the character recognition image section 35, and a character image in the corrected recognition area based on the line mark is obtained.

As explained above, according to the present invention, the positioning of the reading head with respect to the line mark is carried out by extracting the recognition area based on the line mark from the scanning signal area of the character. The deviation is corrected by converting it into a pulse count value.

This makes it possible to position the character recognition area based on the line marks with high precision and at high speed.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of the principle of the present invention, Section 2 is an explanatory diagram of the mechanical configuration of the present invention, and FIG. 3 is an explanatory diagram of the control circuit of the embodiment of the present invention shown in FIG. 1 is paper, 2 is line mark,
3 is the character, 5 is the passage, 1 is the reading head, 8 is the drive shaft, 9
is a drive system, 10.16 is a drive pulse motor, 11,
17 is the coated version, 12.13 is the pulley, 14 is the belt,
15 is a feed roller, 18 is an optical sensor, 21 is a line mark detection section, 22 is a CPU, 23 is a mechanism control section, 24 is a pulse generator, 25.34 is an AND circuit, 26 is a timer, 27
28 is a pulse counter, 28 is an allowable range determination circuit, 29 is a limit value, 30 is a display, 31 is an area determining circuit, 32 is a scanning section, 33 is a video signal memory, and 35 is a character recognition video section.

Claims (1)

[Scope of utility model registration request] By detecting the line mark on the paper, the operation of the driver that moves the reading section and the paper relative to each other is stopped, and the amount of relative movement between the reading section and the paper from that point on is detected by the driver. A character reading device characterized in that a pulse from a pulse generating means is detected by a count value counted by a counter, and based on the detection result, a recognition area based on a line mark extracted from the scanning signal is corrected.