JPH04129953A - Cellophane tape detector for paper sheet conveyer - Google Patents

Abstract

PURPOSE:To prevent a paper sheet from being damaged so as to perform accurate detection by providing the first/second light receivers for receiving directly reflected light and scattered reflected light of the paper sheet and a waveform comparator analyzing part for inputting output signals of both the light receivers to compare a waveform. CONSTITUTION:A light receiver 3 is placed in a symmetrical position to a light emitter 1 to receive directly reflected light from a paper sheet 5 and to output an output signal 102 to a waveform comparator analyzing part 4, and a light receiver 2 receives scattering reflected light from the paper sheet 5 to output an output signal 101 to the analyzing part 4. Next, when the paper sheet 5 is advanced in a direction B, the directly reflected light from the paper sheet 5 is decreased when the paper sheet 5 is provided with a sufficiently rough surface, so that output signals of similar waveform are output to the analyzing part 4 by the output signals 101, 102. When a cellophane tape is pasted partly to the surface of the paper sheet 5, the directly reflected light is increased only in that part, so that an output A corresponding to that part is protrusively increased larger than the other part. The analyzing part 14 detects this output to judge whether the cellophane tape is pasted or not.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a cellophane tape detection device for detecting whether or not cellophane tape is attached to paper sheets to be transported in a paper sheet transport device. .

[Conventional technology]

Conventional cellophane tape detection means for detecting whether or not cellophane tape is attached to a paper sheet to be transported in a paper sheet conveying device applies pressure to the sheet to be inspected and measures its thickness. A method of measurement is used.

[Problem to be solved by the invention]

Conventional cellophane tape detecting means, such as a double series, have the disadvantage of applying pressure to the paper sheet of the subject, thereby damaging the paper sheet. Furthermore, since the thickness is measured by a mechanical means, there is also a problem in that it is difficult to accurately measure the thickness.

[Means to solve the problem]

The cellophane tape detection device of the paper sheet conveyance device of the present invention includes a light emitter that irradiates light to the paper sheet of the object, and a first light receiver that receives the direct reflected light from the paper sheet. , a second light receiver that receives the scattered reflected light from the paper sheet, and a waveform comparison and analysis section that inputs the output signals of the first and second light receivers and compares their waveforms. We are prepared.

That is, the cellophane tape detection device of the paper sheet conveyance device of the present invention includes a light emitting device that is installed at an appropriate angle with respect to the paper sheet to be examined and irradiates the paper sheet with a light beam of an appropriate amount (7). , a first light receiver installed at a position symmetrical to the light emitter with respect to the sheet of paper and receiving direct reflected light from the sheet of paper, and a first light receiver installed at a position perpendicular to the sheet of paper; The apparatus includes a first light receiver that receives scattered reflected light from the paper sheet, and a waveform comparison and analysis section that inputs the output signals of the first and second light receivers and compares their waveforms.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a front view showing one embodiment of the present invention, and FIG. 2 is a front view showing one embodiment of the present invention.
A waveform diagram showing the waveforms of the output signals of the two light receivers when cellophane tape is not attached to the paper sheet of the subject in the embodiment shown in the figure. FIG. 3 is a waveform diagram showing waveforms of output signals from two light receivers when cellophane tape is attached to a leaf.

In FIG. 1, the light emitter] is installed at an appropriate angle (θ1=45°) with respect to the paper sheet 5 of the subject, and the paper sheet 5 is
A suitable amount of light is irradiated onto the object. The light receiver 3 is installed at a position symmetrical to the light emitter 1 with respect to the paper sheet 5 (02 angle 45 degrees), and receives the direct reflected light from the paper sheet 5 and performs a waveform comparison analysis of the output signal 102. Output to section 4.

The light receiver 2 is installed at a position perpendicular to the sheet of paper 5, and receives the scattered reflected light from the sheet of paper 5 to output a signal 10.
is output to the waveform comparison and analysis section 4.

As the paper sheet 5 advances in the direction of arrow B, if the surface of the paper sheet 5 is sufficiently rough, there is little direct reflection light from the paper sheet 5, so the output signals 101 and 102 are similar as shown in FIG. The output signal of the waveform thus obtained is outputted to the waveform comparison and analysis section 4. When cellophane tape is attached to a part of the surface of the paper leaf 5, the direct reflected light increases only in that part, so the output A corresponding to that part increases compared to other parts, as shown in FIG. It becomes larger than the part. This is detected by the waveform comparison and analysis section 4 to determine whether or not cellophane tape is attached.

〔Effect of the invention〕

As explained above, the cellophane tape detection device of the paper sheet conveyance device of the present invention detects the presence or absence of cellophane tape attachment in a non-contact state using optical means, thereby preventing damage to paper sheets. It has the effect of being possible. Furthermore, since the presence of the cellophane tape is detected by the light directly reflected from the tape, it also has the effect of enabling accurate detection.

[Brief explanation of drawings]

Fig. 1 is a front view showing an embodiment of the present invention, and Fig. 2 shows the output signals of the two light receivers in the embodiment of Fig. 1 when cellophane tape is not attached to the paper sheet of the subject. FIG. 3 is a waveform diagram showing the waveforms of the output signals of the two light receivers when cellophane tape is attached to the paper sheet of the subject in the embodiment of FIG. 1. 1... Emitter, 2.3...-Receiver, 4.
... Waveform comparison analysis section, 5 ... Paper leaf.

Claims (1)

[Scope of Claims] 1. A light emitter that irradiates light to a sheet of paper to be examined, a first light receiver that receives direct reflection of the light from the sheet of paper, and a first light receiver that receives the light that is directly reflected from the sheet of paper; It is characterized by comprising a second light receiver that receives scattered reflected light from the leaves, and a waveform comparison and analysis section that inputs the output signals of the first and second light receivers and compares their waveforms. Cellophane tape detection device for paper sheet conveyance equipment. 2. A light emitting device installed at an appropriate angle with respect to the sheet of paper to irradiate the sheet with an appropriate amount of light, and a light emitting device installed at a position symmetrical to the light emitting device with respect to the sheet of paper. a first light receiver that receives reflected light directly from the paper sheet;
a second light receiver installed at a position perpendicular to the sheet of paper to receive scattered reflected light from the sheet of paper; and inputting the output signals of the first and second light receivers to form their waveforms. A cellophane tape detection device for a paper sheet conveying device, comprising: a waveform comparison and analysis section for comparing.