JPH02159593A - Detecting device of optical position of paper sheet or the like - Google Patents

Abstract

PURPOSE:To prevent the deterioration of a position detecting function of a light-sensing element as a photosensor due to paper powder or the like by covering the top part of the light-sensing element with a transparent cover having a large curvature and by constructing the same so that a paper sheet wipes the top part of the cover. CONSTITUTION:In a bank note conveyance unit 1, a light-emitting element 3 directed downward and a light-sensing element 4 directed upward which detect the pass or position of a bank note 2 are disposed on the opposite sides of a conveyance line A-A of the bank note 2. The bank note 2 intercepts a light emitted by the element 3 and sensed by the element 4 and it can be detected thereby that the bank note 2 passes or that it is positioned. While the element 4 is held in a sensor holder 5, the top part of the element 4 is covered with a transparent cover 6 having a projecting surface of a large curvature and the top part of the cover 6 is made to project slightly from the conveyance line A-A. Since the bank note 2 wipes the top part of the transparent cover 6 at all times according to this constitution, neither paper powder nor dust is accumulated on the surface of the cover 6. Since the top part of the transparent cover 6 has the large curvature, in addition, it does not check the conveyance of the bank note 2, and skew and paper clogging caused thereby can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to an optical detection system for paper leaves, and in particular detects the passage or position of paper leaves using an optical sensor that combines a light-emitting element and a light-receiving element. This invention relates to an optical position detection device for paper sheets, etc.

(Prior Art) As an optical position detection device for detecting the passage or position of a paper sheet, etc., as shown in FIG.
It was common to have optical sensors in which a light emitting element +01, a light receiving element 7'+02, and a light emitting element +01 and a light receiving element 21'ζ1 were placed opposite each other with −a in between.

By the way, the 1 light emitting element +01 is placed on the 4th side away from the banknote conveyance line a-a, whereas the light receiving element Y-102
The top of the line slightly protrudes above the conveyor line aa.

This is intended to maintain the function of the optical sensor by wiping away paper powder, dust, etc. adhering to the surface of the light receiving element 102.

However, since the radius of curvature of the tip of the light-receiving element +02 that protrudes above the conveyance lita-a of one banknote is small, the conveyed banknote is less likely to be blocked or skewed by the m portion of the light-receiver element 102, resulting in a paper jam. There was a flaw that there was no.

In order to eliminate such defects, as shown in FIG. 4, there is a bill conveyance guide plate 103 provided around the light receiving element 102 along the conveyance line a-a of the bill. It is not possible to completely eliminate the problem of paper currency being blocked by paper money, and as a result, there is a risk that the leading edge of the paper currency may be crushed, resulting in a paper jam.

(Object of the Invention) The present invention has been made in order to solve the problems of using conventional optical position detection devices as described above. The purpose of the present invention is to provide an optical degree 1n detection device for paper sheets, etc., which has almost no interference.

(Summary of the Invention) In order to achieve the above-mentioned object, the present invention adopts the following configuration.

In other words, the light that detects conveyed banknotes, etc.? Either the light-emitting element or the light-receiving element of the system is covered with a transparent cover having a convex surface with a large curvature, and the top of the cover is configured to slightly protrude from the sheet conveyance line.

(Embodiments of the Invention) Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.

FIGS. 1 and 2 are configuration diagrams showing an embodiment of an optical position detection device for paper sheets, etc., according to the present invention.

In this figure, reference numeral 1 denotes a banknote conveyance unit, in which a light-emitting element T3 facing F and a light-receiving element -r4 facing -L are placed opposite each other to sandwich the conveyance line Δ-8 of the banknote 2 and detect the passage or position of the banknote 2. , it is possible to detect that one banknote 2 has passed or is located by blocking the light emitted by the light emitting element 3 which is received by the light receiving element T-4.

The light receiving element 4 is housed in a sensor holder 5, and the In part of the element 4 is covered with a transparent cover 6 having a convex surface with a large curvature.
, so that the top of the cover 6 slightly protrudes from the conveying line Δ-A.

By configuring in this way, the banknote 2 is covered with transparent cover 6.
1. Since the surface of the cover 6 is constantly wiped, paper powder, dust, etc. do not accumulate on the surface of the cover 6. Further, since the light receiving element 4 is housed in the sensor holder 5 and the transparent cover 6, paper dust and the like will not adhere to it, and the function as an optical sensor can be maintained.

Furthermore, since the top of the transparent cover 6 has a large curvature, it does not prevent the conveyance of the five banknotes 2, thereby suppressing skew and paper jams caused by the skew.

Note that the present invention is not limited to the above-mentioned embodiments, and the same effect can be obtained even if, for example, the positional relationship between the light emitting element 3 and the light receiving element 4 is reversed.

Furthermore, the present invention is not limited to a conveyance device for banknotes 2, and similar effects can be obtained even when applied to a copying machine or a facsimile machine that requires an optical sensor to detect the position of a paper sheet or the like.

(Effects of the Invention) As explained above, the present invention is configured such that the m portion of the light emitting element or the light receiving element is covered with a transparent cover with a large curvature, and the top of the cover is wiped away by paper leaves, so that paper dust etc. In addition, since the transparent cover has a large curvature and allows the leading edge of the conveyed sheet to easily pass through, it is also effective in preventing paper jams.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of an optical position detection device for paper sheets, etc. according to an embodiment of the present invention, and FIG. 2 is a [+-I+ sectional view of FIG.
FIG. 3 is a block diagram corresponding to FIG. 1 of a conventional example, and FIG. 4 is a block diagram of another conventional example. 1... Suppression roller 2... Banknote (paper leaf) 3... Light emitting element 4... Light receiving element 6... Transparent cover Patent applicant Toyo Tsushinki Co., Ltd. Agent Patent attorney Hitoshi Suzuki

Claims (1)

[Claims] In an optical detection system for paper sheets, etc., in which a light-emitting element and a light-receiving element are placed opposite each other across a sheet conveyance line, the light-emitting element or the light-receiving element is covered with a transparent cover having a convex surface with a large curvature, and the top of the cover is covered. An optical position detecting device for paper sheets, etc., characterized in that the device slightly protrudes from the conveyance line of the paper sheets.