JPH07115772B2 - Double feed separation control method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Outline] The present invention relates to a double feed separation control method, and in particular, when a medium to be separated corresponding to a change in medium length is simultaneously bitten into a plurality of brake rollers, the brake roller is fed to a feed roller. The double feed separation control method is characterized in that the brake start timing is controlled so as to rotate asynchronously with each other, and the brake start timing of the brake roller is set so that the medium separation is performed in the best condition corresponding to the change in the medium length. The purpose of the present invention is to provide a double feed separation control method that can be controlled individually, and after measuring the length of the medium fed and conveyed by a sensor, sandwich the medium with a feed roller and a brake roller to feed the brake roller. In the double feed separation control method that separates the medium while rotating it asynchronously with the roller, When the media to be squeezed into a plurality of brake rollers at the same time, the brake rollers start by calculating the transport amount for each media from the media length measured by the sensor so that the brake rollers start asynchronous rotation with respect to the feed rollers. A double feed separation control method is characterized in that the brake start timing is controlled to enable separation of the medium corresponding to a change in medium length.

[Industrial application field]

The present invention relates to a double feed separation control method, and more particularly to a brake so that a brake roller rotates asynchronously with respect to a feed roller when a medium separated according to a change in a medium length is simultaneously bitten into a plurality of brake rollers. The present invention relates to a double feed separation control method characterized by controlling a start time.

[Conventional technology]

When a medium is fed and conveyed, a so-called double feed may occur in which two mediums are fed at once due to a feeding failure. The double feed medium in which these media are overlapped is likely to be misaligned or skewed during conveyance, and as a result, normal processing such as printing across two sheets cannot be performed.

Therefore, conventionally, it is necessary to determine whether or not the medium is a double feed medium before processing, so the medium length is measured before and after the step of separating the medium, and if different, it is determined as double feed, and if the same, it is determined as normal feed. Processing.

A conventional double feed separation control method will be described with reference to FIGS. 1A and 1B. As shown in FIG.
18 The medium length is measured when the medium sent from below to above passes through the sensor 12, and is further sent upward by the feed roller 15a and the pinch roller 16a. Brake rollers 14a, 14b facing the feed rollers 13a, 13b when the trailing edge of the medium passes through the feed roller 15a and the pinch roller 16a and reaches a preset fixed position (for example, position B in FIG. 2B). Is brake-rotated by the brake source 21, and the medium is separated by the difference in the frictional force between the double feed medium and the feed roller and the brake roller and the rotation cycle. When the front end of the medium hits the brake timing sensor 17, the braking rotation of the brake rollers 14a, 14b is turned off,
The sensor 22 measures the medium length while the feed roller 15b and the pinch roller 16b feed further upward. The medium lengths of the sensor 12 and the sensor 22 are compared, and if they are the same, it is determined that they are normal feed and different double feed, and they are processed.

[Problems to be Solved by the Invention]

However, in the above-described conventional double feed separation control method, even when separating media of different lengths, the brake roller is fixed by braking and rotating when the rear end of the media reaches a preset position (for example, position B). Control method. Therefore, when the medium to be separated is the short medium on the right side of FIG. 1B, the braking rotation is started when the medium is applied to both the brake rollers 14a and 14b, so that efficient separation can be performed. it can. However, if the medium is shorter than this, the rotational force may be affected by each other while the feed roller 13b and the brake roller 14b are in direct contact with each other, resulting in a reduction in braking force and a feed failure. On the other hand, in the case of the long medium on the left side of FIG. 6B, when the brake roller is braked at the position B, the tip portion comes close to the timing sensor 17, so that the separation section is short and a sufficient separation amount cannot be secured. There were challenges.

Therefore, the present invention provides a double feed separation control method capable of individually controlling the brake start timing of the brake rollers so that the medium separation is performed in the best state in response to the change in the medium length. With the goal.

[Means for solving problems]

The above-mentioned problem is encountered in the double feed separation control method in which after measuring the length of the medium fed and conveyed by the sensor, the medium is sandwiched between the feed roller and the brake roller and the medium is separated while the brake roller is asynchronously rotated with respect to the feed roller. , The brake is calculated by calculating the transport amount of each medium from the medium length measured by the above sensor so that the brake roller starts asynchronous rotation with respect to the feed roller at the time when the separated media are simultaneously bitten into multiple brake rollers. This is achieved by a double feed separation control method characterized in that the roller brake start timing is controlled to enable separation of media corresponding to changes in medium length.

[Action]

That is, the present invention, as shown in FIGS. 1 (a) and (b),
After measuring the length of the medium 11a, 11b that has been fed and conveyed by the sensor 12, the feed roller 13a, 13b and the brake roller 14a, 1b
The media 11a and 11b are sandwiched between the 4b and a plurality of brake rollers 14a and 14b.
So that the brake rollers 14a, 14b start to rotate asynchronously with respect to the feed rollers 13a, 13b when they are simultaneously bitten into the brakes by calculating the transport amount for each medium 11a, 11b from the medium length measured by the sensor 12. By controlling the brake start timing of the rollers 14a and 14b, the braking of the brake rollers is performed at the optimum position corresponding to the media of various lengths, so that the braking force is reduced, feed failure or the separation amount is insufficient. It has become possible to reliably separate double feed media.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is an explanatory view of the principle of the separation control method of the present invention, in which (a) is an explanatory view of the separation control method and (b) is the same drawing (a).
2 is a medium flow diagram showing a control method of an embodiment of the present invention, FIG. 3 is a plan view showing a medium separation state by a brake roller, and FIG. 4 is a flow chart of the present invention. FIG. 5 is an explanatory view of the separation control method in the embodiment, and FIG. 5 is an explanatory view of the separation control method in the embodiment of the present invention in the certificate issuing machine.

In the figure, 11a and 11b are media, 12 is a sensor, 13a and 13b are feed rollers, 14a and 14b are brake rollers, 15a and 15b are feed rollers, 16a and 16b are pinch rollers, 17 is a brake timing sensor, and 18 is conveyance. Road, 19 is a belt, 20 is a drive source, 21 is a brake source, 22 is a sensor, 23 and 24 are pinch rollers, 25 is a feed roller, 26 is a cassette box, 27 is a delivery roller, 28 is a printer, 29 is a point, Reference numeral 30 is a reject box, 31a is an upper housing portion, and 31b is a lower housing portion.

In the present embodiment, a double feed medium separation control method is implemented in a certificate issuing machine in which various types of certificates used in banks and the like are appropriately selected and the certificate contents are printed by a printer and automatically issued.

In the double feed separation control method of this embodiment, when the double feed medium is separated by the plurality of brake rollers 14a and 14b, the brake rollers 14a and 14b are fed from the time when the medium is simultaneously bitten into the plurality of brake rollers. By making the rollers 13a and 13b asynchronously rotate, the separating function of the brake rollers is used most effectively.

If the brake roller is rotated asynchronously at a timing earlier than this, the braking force is reduced and feed failure occurs, and if it is later, the separation section becomes shorter and a sufficient separation amount cannot be secured.

Therefore, in this embodiment, as shown in FIG.
Here, the lengths of the media 11a and 11b that are delivered to the transport path 18 and transported are measured by the light transmission type sensor 12 here. The light transmissive sensor measures the medium length by the time that the medium 11 passes while blocking the light. The sensor 12 is not limited to the light transmission type.

Next, the media 11a and 11b whose lengths have been measured are the feed rollers 1
5a and the pinch roller 16a feed it upward, and the feed rollers 13a, 13b and the brake rollers 14a, 14b are conveyed to a position where they are simultaneously bitten, and the brake rollers 14a, 14b are braked. Since the transport amount of the medium differs depending on the length of the mediums 11a and 11b, in this embodiment, the transport amount suitable for each medium is calculated by the following method to control the brake start timing of the brake rollers 14a and 14b.

For example, in the case of the long medium shown in FIG. 1 (b), the transport distance until the rear end of the medium 11a, 11b passes the sensor 12 and reaches the desired position (position A) is from the sensor 12 to the brake roller 14b. The remainder obtained by subtracting the medium length measured by the sensor 12 from the distance is the long medium transport distance. Similarly for short media, the sensor
If the distance from 12 to the brake roller 14b is carried by the remaining distance obtained by subtracting the length of the short medium measured by the sensor 12, the rear end of the medium 11a, 11b can be brought to the position B as shown in the figure. it can.

FIG. 2 is a flow chart showing the flow of the control method of this embodiment. The transport distance of each medium is calculated by the control unit, and the result is the drive source 20 such as the pulse motor shown in FIG. 1 (a). Thus, the medium can be controlled to be conveyed to a desired position.

In this way, by controlling the brake start timing of the brake rollers 14a, 14b according to the medium length, the separation function of the brake rollers can be used most effectively, so that reliable separation corresponding to various media becomes possible. It was

As shown in FIG. 3 (a), the media are separated by biting the media 11a and 11b of length l ₁ which are overlapped by double feed and fed by the feed roller and the brake roller, and brake the brake roller to rotate the brake roller. The medium 11a on the feed roller side is fed by l ₂ while the medium 11b on the side is left, and is separated in the state of FIG. 3 (b). FIG. 4 shows the actual state of the medium separating portion. The difference between the medium lengths in FIGS. 3 (a) and 3 (b) is measured and compared by the sensor 12 and the sensor 22 in FIG. Normal feed, and if different, it is judged as double feed (see the flow chart in FIG. 2).

In this embodiment, the medium separating section shown in FIG. 4 is used, and the double feed separating control method is carried out by the certificate issuing machine shown in FIG. Seven types of certificates having different lengths and formats are stored in the cassette boxes 26 of the upper and lower storage portions 31a and 31b, which are appropriately selected and automatically issued. As in the case of this certificate issuing machine, there is a demand for a separation control method that can handle certificates of various lengths.

The certificate delivered by the delivery roller 27 is a feed roller.
25, etc. are sent in the conveying path 18 as arrow A → B, and the sensor
After measuring the medium length at 12, the medium is separated by the above-described medium separation control method, and the medium length is measured again by the sensor 22 to determine whether or not it is a double feed. In the case of a normal feed, the content of the certificate is printed by the printer 28 at the top through the arrow C, and the certificate is issued through the path indicated by the arrow E.
In the case of double feed, arrow D is not printed
It is discarded into the reject box 30 through the route indicated by.

〔The invention's effect〕

As described above, the double feed separation control system of the present invention controls the brake start timing of the brake roller individually from the medium length of the issued medium so that the medium separation can always be performed in the best condition that matches the medium length. As a result, the separation amount is not insufficient, feed failure of the feed roller or reduction of the braking force of the brake roller is eliminated, and reliable medium separation is possible.

[Brief description of drawings]

FIG. 1 is an explanatory view of the principle of the separation control method of the present invention, in which (a) is an explanatory view of the separation control method and (b) is the same drawing (a).
Fig. 2 is a medium separation state diagram corresponding to Fig. 2, Fig. 2 is a medium flow diagram showing a control method of an embodiment of the present invention, Fig. 3 is a plan view showing a medium separation state by a brake roller, and Fig. 4 is a diagram showing the present invention. FIG. 5 is an explanatory view of the separation control method in the embodiment, and FIG. 5 is an explanatory view of the separation control method of the embodiment of the present invention in the certificate issuing machine. In the figure, 11a and 11b are media, 12 is a sensor, 13a and 13b are feed rollers, 14a and 14b are brake rollers, 15a and 15b are feed rollers, 16a and 16b are pinch rollers, 17 is a brake timing sensor, and 18 is conveyance. Road, 19 is a belt, 20 is a drive source, 21 is a brake source, 22 is a sensor, 23 and 24 are pinch rollers, 25 is a feed roller, 26 is a cassette box, 27 is a delivery roller, 28 is a printer, 29 is a point, Reference numeral 30 is a reject box, 31a is an upper storage section, and 31b is a lower storage section.

Claims (1)

[Claims] 1. A feed roller (13a, 13b) after measuring the length of a medium (11a, 11b) fed and conveyed by a sensor (12).
b) and the brake rollers (14a, 14b) sandwich the medium (11a, 11b) and the brake rollers (14a, 14b) with the feed roller (13
Medium (11a, 11b) while rotating asynchronously with respect to a, 13b)
In the double feed separation control method of separating the plurality of brake rollers (1a, 11b)
4a, 14b) at the same time the brake roller (14a, 14b) starts asynchronous rotation with respect to the feed roller (13a, 13b) from the medium length measured by the sensor (12) to the medium ( 11a, 11b) is calculated and the brake start timing of the brake rollers (14a, 14b) is controlled to enable separation of media (11a, 11b) corresponding to changes in media length. Double feed separation control method.