JPS5811664B2 - Automatic media positioning method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic medium positioning method for detecting a print position on a print medium.

In bankbooks, etc., the deposit amount, refund amount, date, etc. are automatically entered using a typewriter.

To do this, it is necessary to detect the line on which printing was previously performed and control the feeding of the passbook and the operation of the typewriter so that the current printing is performed on the next line.

Conventional devices of this kind include punching holes in the passbook or printing special marks during printing, or storing printed lines by magnetic means and dripping with mechanical, optical, or electrical detection devices. The mark was read and the next printing line was automatically positioned.

However, these methods have disadvantages such as making holes in the passbook, damaging it, adding special marks to make the passbook difficult to read, or complicating the position detection mechanism.

In order to overcome these drawbacks, the following techniques have been proposed.

This system detects the next recording position by using an optical sensor to detect a mark printed during the previous printing, such as a star printed in front of the number indicating the amount to prevent the amount from being revised. be.

With this technology, there is no need to make holes in passbooks, and there is no need to print special marks on them.

However, this technique has the following drawbacks.

This is because the position of the mark relative to the passbook is misaligned during the previous printing.

This may be caused by an error in the printing arrangement of the printing section, an error in positioning the printing position, or the like.

If the mark is misaligned with respect to the passbook, especially in the direction perpendicular to the direction of passbook feeding, if it is out of the detection area of the optical sensor, it will cause double printing where the previously recorded position is printed again, or line skipping where there will be a blank line in the middle. This will occur.

As mentioned above, such defects are mainly due to mechanical errors (for example, backlash) in the printing section, but it is almost impossible to completely eliminate these errors.

To this end, it is conceivable to set the detectable area of the optical sensor to be wide in anticipation of printing misalignment in advance.

However, detecting marks using such a technique has the following disadvantages.

In other words, since the detectable area becomes wider, the area occupied by the mark in that area decreases, and when looking at the output of the optical sensor, the output when a mark is detected and the output when no mark is detected are S/ It is difficult to obtain a large N ratio, and it becomes difficult to set a level for slicing the output of the optical sensor.

In view of these points, the present invention more reliably detects the next recording position without damaging or unnecessarily staining the passbook, and even if the mark to be detected is printed out of alignment in the direction perpendicular to the feeding direction of the medium. This provides a possible automatic positioning method.

Next, the present invention will be described in detail with reference to the drawings.

In FIG. 1, reference numeral 1 indicates a part of a deposit passbook, and as is well known, this passbook has a date column 2, a refund amount column 3, a deposit amount column 4, etc.

Reference numeral 5 denotes a fixed mark provided in the present invention, consisting of equally spaced thick black lines, which is used to designate horizontal lines to be printed.

A printing device such as a typewriter (not shown) prints the date, amount, etc. between the thick black fixed marks 5 as shown in the drawing.

A passbook is made up of multiple sheets of thick paper with preprinted call marks, dates, amount fields, etc., which are sewn together in the center, stitched together, and folded in half.

A mark sensor 6 is provided to detect the line to be printed next time.

The mark sensor 6 is composed of, for example, a photoelectric detector as shown in FIG. 2. The mark sensor 6 is composed of a photoelectric detector as shown in FIG. It receives light at an angle of 14° and guides it to a photosensitive element (not shown).

The mark sensor 6 has two sets of photoelectric detectors, each aiming at a hyphen 2a, 2b attached to the date.

Further, each set of photoelectric detectors 6a, 6b consists of three sets of light emitting/receiving devices consisting of 61a to 63a and 61b to 63b as shown in FIG. 22 performs a logical sum, and an AND gate 23 performs a logical product.

The three sets of light emitting and receiving devices aim at the left end, center, and right end of the hyphens 2a and 2b, respectively.

Since the outputs of these light emitting and receiving devices are logically summed, even if the mark sensor 6 is slightly misaligned, it is possible to reliably detect a hyphen.

Further, since the outputs of each photoelectric detector 5a+6'') are logically ANDed, a detection signal is not generated by only one output, so that there is an advantage that malfunction does not occur even if there are stains such as stains on the passbook.

Further, the hyphen is long horizontally and short vertically, and is the same mark on each line without changing like numbers in dates or monetary amounts, so it is convenient for accurately detecting the previous printing position.

The hyphen detection signal from the mark sensor 6 may be used as it is to stop the passbook drive mechanism and execute printing on the typewriter, but with this method, as the number of printing increases, the printing position deviation from the previous printing will accumulate. become.

In the present invention, in order to prevent this, a fixed mark 5 designating the print line position is printed in advance on the left end of the bankbook, and this is read by a fixed mark sensor 7.

The sensor 7 is also composed of a photoelectric detector similar to the sensor 6.

Since the sensor 7 reads the fixed mark 5 and produces an output as shown in FIG.
6, the pulse is inverted as shown in FIG. 2, and this is applied to the AND gate 25.

The sensors 6 and 7 are arranged so that the hyphen detection signal of the mark sensor 6 is detected before the fixed mark detection signal.
Place.

The output of sensor 6 is sent to monostable circuit 2 via antoge 123.
4 is converted into a pulse having a constant pulse width W as shown in FIG. 3.

When the AND gate 25 is opened by the output pulse of the monostable circuit 24, the detection signal S of the fixed mark 5 immediately after the hyphen is detected is outputted from the AND gate 25, as shown in FIG.

The time position of this detection signal S remains unchanged even if the previous printing position deviates and the hyphen detection signal deviates back and forth from the predetermined position as shown by the dotted line in FIG. 4.

In this way, by using the detection signal S, it is possible to automatically correct the previous printing position deviation and print at the correct line position next time.

As is clear from the detailed explanation above, according to the present invention, one mark is detected by a plurality of independent light-receiving elements arranged perpendicularly to the feeding direction of the medium, and their outputs are logically summed. , it is possible to compensate for horizontal printing misalignment of marks and media feeding errors.

The stopping method of the present invention is of course not limited to automatic entry in bankbooks, but can be used to control the stopping position of any print medium that uses hyphens at fixed positions, such as receipts and ledgers.

[Brief explanation of drawings]

FIG. 1 is a plan view of a portion of a printing medium, FIG. 2 is a perspective view of a mark sensor, FIG. 3 is a block diagram showing a hyphen detection signal generation circuit, and FIG. 4 is a pulse waveform diagram. In the figure, 1 is a printing medium, 2a and 2b are hyphens, 6 is a mark sensor, and 61a to 63a161b to 63b are three sets of light emitting and receiving devices.

Claims (1)

[Claims] 1 The printing medium is automatically sent toward the printing position, and the mark printed on the medium during the previous printing is irradiated with light from the issuer that irradiates the position where the mark should be printed, and the reflected light is emitted. In a method of automatically positioning the next recording position of a print medium to a printing position by detecting light by receiving light with a light receiving element and detecting the next recording position of the medium, the light receiving element is a plurality of light receiving elements for one mark. An automatic medium positioning system characterized in that the light receiving elements are assigned, these light receiving elements are arranged in a direction perpendicular to the direction of feeding of the printing medium, and the outputs thereof are logically summed.