JPH06156814A - Paper sheet discriminating device - Google Patents

Abstract

PURPOSE:To provide a paper sheet discriminating device which can detect irregularity in a sheet surface, adhesion of foreign matter such as tape. CONSTITUTION:A pressing member 4 is provided which presses a paper sheet S, which constitutes a carrier passage with a part of the outer circumference surface side of a columnar or cylindrical guide member 2, and is fed along it, from the top end side against a guide member 2 side in order, and curves a pressed part of the sheet S, and a light source 12 and a light receiving part 8 are disposed fore and aft approximately along the tangential direction of the curved part of the sheet S. Irregularly reflected light due to irregularity, generated when the light emitted from the light source 12 passes through or is reflected by the curved part of the sheet S is detected by the light receiving part 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper sheet discriminating apparatus, and more particularly to a paper sheet discriminating apparatus capable of detecting adhesion of foreign matter to paper sheets.

[0002]

2. Description of the Related Art As a paper sheet discriminating apparatus for optically obtaining information on paper sheets, a paper sheet conveyed on a flat conveying path is perpendicular or oblique (for example, a paper sheet). A light-receiving portion including a light source and a photodiode is provided at one or a plurality of locations at an angle of 45 ° (for example, Japanese Patent Laid-Open No. 2-109191).

[0003]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention The above-mentioned sheet discriminating apparatus mainly discriminates the difference in the thickness of the sheet and the difference in the printed portion by changing the transmitted light or the reflected light due to the absorption of the sheet. Although it could be detected, the unevenness of the surface of the paper sheet could not be detected, and the adhesion of foreign matter such as tape could not be detected.

Therefore, an object of the present invention is to provide a paper sheet discriminating apparatus capable of detecting irregularities on the surface of a paper sheet and detecting adhesion of foreign matter such as tape.

[0005]

In order to achieve the above-mentioned object, a paper sheet discriminating apparatus of the present invention has a columnar or cylindrical guide member, and a conveying path together with a part of the outer peripheral surface side of the guide member. And a pressing member configured to press the paper sheets that are conveyed along the conveyance path sequentially from the tip side toward the guide member side to bend the pressing portion of the paper sheets, and the curved portion of the paper sheets. Is characterized in that a light source and a light receiving section are arranged in front and back along substantially the tangential direction.

[0006]

According to the paper sheet discriminating apparatus of the present invention, the paper sheet is pressed by the pressing member in order from the front end side toward the guide member side so that the pressed portion is curved. The light emitted from the light source provided as such hits irregularities when passing through or reflecting on the curved portion of the paper sheet and causes irregular reflection. Then, by the light receiving portion arranged along the other substantially tangential direction of the curved portion,
The irradiation light diffusely reflected according to the irregularities and the irradiation light that normally passes or is reflected are detected.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A paper sheet discriminating apparatus according to an embodiment of the present invention will be described below with reference to FIGS. In the figure, reference numeral 1 indicates a discriminating apparatus main body. The discriminating apparatus main body 1 includes a drum 2 that is a guide member that is rotatably provided and has a cylindrical or columnar shape, and a plurality of discs in the axial direction of the drum 2 (see FIG. Conveying belts 3 each having one end side wound around the drum 2 and a drum contact range 3 of each conveying belt 3 are provided.
It has a pressing belt 4 which is a pressing member provided in the same number as the conveying belt 3 so as to be pressed against a. The conveyor belt 3 has side portions 3b and 3c that are not in contact with the drum 2 and are parallel to each other.
A side portion of another conveyor belt (not shown) is provided so as to come into contact with the conveyor belt so that the paper sheets S such as banknotes are sandwiched and conveyed.

The drum 2 is driven in the clockwise direction in FIG. 1 directly or indirectly via the conveyor belt 3 by the driving force of a motor (not shown). The pressing belts 4 are parallel to the rollers 5 and 6 arranged to face each end of the drum contact area 3a of the conveyor belt 3 and the sides 3b and 3c of the conveyor belt 3 from the center of the drum 2. The roller 7 provided on the extended line is wound to generate a predetermined tension, and in this state, a predetermined pressure contact force is generated between the conveyor belt 3 and the drum contact area 3a. (Fig. 1 is not in direct pressure contact because it holds the paper sheet S). The pressing belt 4 is driven by the conveyor belt 3 together.

As described above, the conveyor belt 3 on the side of the drum 2 and the pressing belt 4 in pressure contact with the conveyor belt 3 constitute a conveyor path for sandwiching and conveying the paper sheet S at these pressure contact portions, and the drum 2 rotates. The paper sheets S conveyed on this conveyance path by
Is pressed by the pressing belt 4 from the front end side to the conveying belt 3 on the drum 2 side in order and curved. In addition, the pressing belt 4 is provided without providing the conveyor belt 3.
It is also possible to directly press the drum onto the drum 2.

The surface of the paper sheet S conveyed by the pressing belt 4 and the conveyor belt 3 on the opposite side of the drum 2 and the sides 3b, 3c of the conveyor belt 3 from the center of the drum 2.
In the tangential direction of the position intersecting the line extending in parallel with, the detector (light receiving portion) 8 composed of a photodiode or a CCD sensor is provided on the rotation direction side of the drum 2, and the slit 9, lens 10 and light emission are provided on the opposite side. A light source 12 composed of a source 11 is provided, and the detector 8 and the light source 12 are provided.
As shown in FIG. 2, a plurality of pairs are provided between and outside each of the pressing belts 4 (in FIG. 2, only the light emission source 11 is shown as the light source 12). In addition, the light emitting source 1
The irradiation light emitted from 1 is made into a parallel light beam along the tangent line by the lens 10, and is passed through the slit 9 to be an irradiation light having an arbitrary shape.

The detector 8 is a control device 13
The control device 13 is connected to the detector 8
Whether or not the surface irregularity is normal is determined from the angle of irregular reflection of irradiation light, which will be described later, calculated from the detection point of the irradiation light.

According to the paper sheet discriminating apparatus having such a configuration, the leading edge of the paper sheet S conveyed by the conveyor belt 3 is moved to the conveyor belt 3 by driving the drum 2 and the conveyor belt 3. The sheet S is held by the pressing belt 4, and the front end of the paper sheet S is pressed against the conveying belt 3 so that the conveying belt 3
It will be curved along and conveyed. Then, when the front end of the curved paper sheet S reaches a position intersecting with a line extending from the center of the drum 2 in parallel with the sides 3b and 3c of the conveyor belt 3, the front end of the paper sheet S is reached. The irradiation light emitted from the light source 12 including the light emission source 11, the lens 10 and the slit 9 passes through the surface of the drum 2 opposite to the surface, and the irradiation light is detected by the detector 8. In this manner, the paper sheet S is sequentially and continuously curved by the rotation of the drum 2, and the irradiation light from the light source 12 passes through the surface of the curved portion.

When the surface of the paper sheet S is normal, the irradiation light passes through the surface of the paper sheet S almost as it is and reaches the detector 8. When there is unevenness due to the adhesion of foreign matter such as ink or tape on the surface, the irradiation light emitted from the light source 12 reaches the detector 8 at an angle which causes irregular reflection due to the unevenness (for example, FIG. 1). State indicated by the two-dot chain line) Then, the control device 13 determines whether or not the surface state of the paper sheet S is normal based on the angle of the irradiation light that is calculated from the point where the detector 8 detects the irradiation light (for example, the angle of the detected light is If it is within a predetermined permissible angle, it is determined to be normal, and if it exceeds this permissible angle, it is determined to be abnormal), and a predetermined process such as discharging the abnormal paper sheet S to the outside is performed. become. If the height of the unevenness is too high, the irradiation light cannot reach the detector 8, that is, the irradiation light cannot be detected, so that the surface state is determined to be abnormal. Further, on the downstream side of the transport path, the transported sheet S is curved with its back side facing up, and the curved back side is detected by the light source 12 and the detector 8 similar to the above, and both sides The uneven state can be detected.

The line connecting the light source 12 and the detector 8 can be along any tangential direction of the curved portion of the paper sheet S. Further, when the detector 8 is composed of a CCD sensor, the light source 12 is inclined at a slight angle with respect to the tangential direction of the curved portion of the paper sheet S, and normal paper sheets emitted from the light source 12 are emitted. It is also possible to detect the unevenness by utilizing the fact that the reflected light reflected at a slight angle on the surface of S and the irregularly reflected light when there is unevenness have different angles. Further, when the paper sheet S has high unevenness, a detector is also arranged in the direction perpendicular to the contact point between the irradiation light and the curved paper sheet S, and the shadow due to the unevenness of the irradiation light is detected by the detector. It is also possible.

[0015]

As described in detail above, according to the paper sheet discriminating apparatus of the present invention, the paper sheet is pressed by the pressing member in order from the front end side to the guide member side, and the pressing portion is curved. The light emitted from the light source arranged along the tangential direction on one side of the curved portion impinges on the irregularities when passing through or reflected on the curved portion of the paper sheet, resulting in irregular reflection. Then, the light receiving portion arranged along the other substantially tangential direction of the curved portion detects the irradiation light diffusely reflected according to the unevenness and the irradiation light that normally passes or is reflected. Therefore, it is possible to detect irregularities on the surface of the paper sheet, and it is possible to detect adhesion of foreign matter such as tape.

[Brief description of drawings]

FIG. 1 is a front view showing a paper sheet discriminating apparatus according to an embodiment of the present invention.

FIG. 2 shows a paper sheet discriminating apparatus according to an embodiment of the present invention.
It is the figure seen from the lower side.

[Explanation of symbols]

 2 Drum (guide member) 4 Pressing belt (pressing member) 8 Detector (light receiving part) 12 Light source S Paper sheets

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location G07D 7/00 G 9340-3E

Claims (1)

[Claims] 1. A guide member having a columnar shape or a cylindrical shape and a part of the outer peripheral surface side of the guide member to form a conveying path, and the paper sheets conveyed along the conveying path are sequentially guided from the leading end side. A pressing member that presses against the member side to bend the pressing portion of the paper sheet, and the light source and the light receiving unit are arranged in front and rear along substantially the tangential direction of the curved portion of the paper sheet. Characteristic paper sheet discrimination device.