JPS58113704A - Detector for thickness of paper sheet - Google Patents

Abstract

PURPOSE:To detect conveying of paper sheets in superposition of two sheets, the ruptured holes of the sheets, sticking of self-adhesive tapes thereon, etc. with simple constitution by detecting the oscillating and displacing extents of a detecting lever owing to a change in the thickness of the sheets passing between a stationary reference roll and the detecting lever. CONSTITUTION:When the paper money 2 past the conveying passage 1 arrives at the spacing between a stationary roll 6 and the preceding end of a detecting lever 10 which is held in light contact with a reference roll 6 by means of a spring 9, the lever 10 oscillates and displaces counterclockwise around a fulcrum shaft 8. A light emitting diode 12 and a photodiode 13 having photodetecting parts 13a, 13b is held by a sensor block 14, by sandwiching the succeeding end part 10b of the lever 10. The light conducted to the photodetecting parts 13a, 13b past a slit 16 is interrupted by the shielding part 17 of the lever 10, and the conveying of paper money 2 in superposition of two sheets, the ruptured holes of the sheets, self-adhesive tapes thereon, etc. are detected surely by the differential light signals from both photodetecting parts 13a and 13b.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to a thickness detection device for the paper industry, which is applicable to detecting the thickness of banknotes during transportation in a banknote handling device, for example. Problems: For example, in the banknote handling equipment of Misaki, which inspects, counts, and sorts banknotes, there is a rounding system that detects the stacking of 12 banknotes, the presence of holes in the banknotes, the presence or absence of joints with adhesive chips, etc. A thickness detection device is employed.

A conventional thickness detection device for this type of paper sheet has a configuration as shown in Fig. 1. In other words, a in the figure is a thickness reference provided opposite to the paper conveyance path @. The thickness reference roller a is stretched to form the above-mentioned conveyance path, and the conveyor belt 9 is a belt support row on which the liquid is pumped. f-・It is provided coaxially with the 01 roller and rotates as one unit.・The above thickness reference roller a is able to swing freely around the support shaft. It is configured such that it is rotatably attached to the tip of the detection sensor t4-j, which is energized by the pressure detection sensor t4-j, and the pressure detection sensor p-line i is brought into rolling contact with the pressure detection sensor t4-j. However, the paper sheet conveyor bell) d, d,...
・When the paper sheet is conveyed through the conveyance path C in good condition with both upper and lower edges held by the The detection lever h, to which the detection roller turtle is attached, is pushed away in the downward direction of the S type and oscillates around the spindle g.Then, 'c, the displacement of the O detection lever is approximated As detected by the sensor j, or by transmitting it to the second detection lever k, the amount of rocking displacement is magnified and detected by the photocoupler 4.

However, in this conventional device, when the thickness reference roller a and the detection roller 71 rotate, there is a relatively large play in detecting the thickness of the paper **b due to j or by enlarging the amount of displacement with the second detection lever h.
) Also, the detection roller IK requires a complicated mechanism.
Because it uses rollers such as bearings, it is difficult to detect small tears and holes in paper sheets, which is dangerous.

Aspects of the Invention The present invention was developed based on the above-mentioned circumstances.The purpose of the present invention is to have a relatively simple and inexpensive structure, and to transport two sheets of paper in a stacked manner. It is an object of the present invention to provide a paper sheet stacking device that can reliably detect tear holes in leaves and adhesive chips attached to paper sheets. A thickness reference roller consisting of a non-rotating fixed roller is provided opposite to the conveyance path, and a part of the roller is brought into contact with this thickness reference roller to ensure that the paper sheet is in good condition as it passes through. A detection lever is provided that swings in the thickness direction, and the swing displacement of this detection lever is detected by a differential diode. One embodiment will be explained with reference to FIGS. 2 to 5. ・In FIG. 2, 1 is a conveyance path for conveying banknotes l as paper sheets in an upright position and in the side direction. Road 1
9 conveyor belts 4, 4 are stretched in parallel by being stretched over belt supports p-23, and conveyor belts 5. 5, and the upper and lower edges of the banknote 2 are respectively held and conveyed by a conveyor belt 4.degree.

Further, a thickness reference member l is provided opposite the conveyance path 1. This thickness reference member 6 is the conveyor (ru) 4t4*5
．． Non-rotating fixings are scattered around the support shaft 1 which rotatably supports the belt support rollers 1, 1 around which i is wound.
It consists of a part.

As shown in Fig. 3, this thickness reference member (hereinafter referred to as "thickness reference") C is attached so as to be able to swing around the center of the support shaft #tube, and is constantly applied with an extremely weak force in the clockwise direction by a sliding ring 9. 9, and one end of the detection lever 10 is in contact with it.

When the banknote 2 reaches the thickness reference roller 6, the one end 101 of the detection lever 10 is pushed away in the thickness direction of the banknote 2, and the detection lever 10 is oscillated counterclockwise about the support shaft 1. (In addition, according to the banknote 2 at the point of contact with the guide plate z01d reference rod 6 shown in FIG. 3)
This prevents the detection lever 10 from being pushed away. The other end J6b of the detection lever 10 is interposed between the light emitting diode 12 of the detector 11 and the differential photodiode 1j and is in good condition.
2 and a differential 7 autodiode 13 are held by a sensor block 14.

The differential photodiode
On the other hand, as shown in FIG. 4, the other end 10b of the detection lever 10 has a sleeve) Jb.
A light shielding part 11 which is slightly wider than the interval 15 between the receiving parts IJa and isb is formed between these sleeves 11621. 17 is the light receiving surface J of the differential photodiode 13 as shown in FIG.
When the light guided to Jsa2Jb is uniformly blocked, the first and second light-receiving surfaces IJae
The amount of light received by I J l) is equal, and the fourth - (
b) As shown in Fig. 4f, when the detection lever 10 changes according to the thickness of the banknote 2 as it passes,
The amount of light guided to the second received light ii 13 m +13b changes.

That is, as the amount of light received at the first light receiving surface 131 increases, the amount of light received at the second light receiving direction 13b decreases. When the current generated at J b exceeds Va e vb, the signal is detected as vx = Va - Vb.Even if the movement of the 9th detection lever 10 is minute, as Va increases, vb decreases. Therefore, the change in VX will be doubled.The displacement amount and differential optical signal between this and the other side can be detected, for example, as shown in Fig. 5, and a signal proportional to the displacement amount of #-19 can be surely obtained Therefore, the differential photodiode 1
3) can carry two stacked banknotes 2, detect a large tear in the banknote 2, and detect adhesive particles attached to the banknote 2. Note that the thickness reference roller does not rotate. Therefore, the zero thickness reference does not vibrate, so the signal at zero thickness is stable, and also when detecting the thickness of the banknote 2, there is no rotational vibration of the reference 4-26, so the thickness r - ta VX is also stable and becomes a friend value. As a result, the thickness detection operation is stable and can be performed in good condition.

In addition, as shown in Figure 3, the thickness standard is 9, and the gap line detection lever 10 is used during assembly.
If one end becomes worn, it can be easily adjusted by turning it in a predetermined direction via a knob 18.

By constructing at least the contact portion of the detection sensor A-10 with the thickness reference point C of carbon fiber, it is possible to reduce the weight, improve the abrasion resistance, and obtain a product with even better responsiveness.

In the above-described embodiment, the thickness reference member is a roller, but the present invention is not limited to this, and the same performance as that of a chisel can be obtained by using a mere reference surface such as a flat plate.

In addition, it goes without saying that the present invention can be modified in various ways without departing from the gist of the present invention.

Effects of the Invention As explained above, the present invention provides a thickness reference roller consisting of a non-rotating fixed roller facing the conveyance path for conveying paper sheets, and a part of the thickness reference roller is brought into contact with the thickness reference roller. A detection lever is provided which swings in the direction of the thickness of the paper as the paper passes, and the amount of swinging displacement of the detection lever is detected by a differential photodiode. Therefore, it is a relatively simple and inexpensive configuration.
However, it is possible to reliably transport two sheets of paper #i, detect large tears in paper products, and detect slime sticks attached to paper products.

[Brief explanation of the drawing]

Figure 3141 is a perspective view of a conventional device, Figure 2 is a perspective view showing an embodiment of the present invention, Figure 3 is a plan view of the main parts, and Figure 4 (0).
←) f is an explanatory diagram showing the relationship between the displacement of the detection lever and the differential photodiode, and FIG. 5 is an explanatory diagram showing the relationship between the displacement amount of the differential photodiode and the differential optical signal. DESCRIPTION OF SYMBOLS 1... Conveyance path, 2... Paper industry (banknotes), 6... Thickness reference member (thickness reference p-ra), 8... Support shaft, 10...
...Detection lever, J J-...Detector, I'l-...Differential photodiode. Applicant's representative Patent attorney Takehiko Kakie

Claims (3)

[Claims] (1) A non-rotating thickness reference member provided opposite to the conveyance path for conveying paper sheets, and a part of the thickness reference member that is placed in good condition and in contact with this thickness reference member to facilitate the passage of paper sheets. It is characterized by comprising a detection lever that swings and displaces in the thickness direction of the paper sheet, and a differential seven-otodiode that detects the amount of swing displacement of this detection lever, and nine detection gains. Paper industry thickness detection device/ (2) Detection of the thickness of paper sheets according to claim 1, characterized in that the thickness reference member is composed of an eccentric roller so that wear of the detection lever is compensated for. Device. (3) The paper sheet stacking device according to claim 1, wherein at least the contact portion of the detection lever with the thickness reference member is made of carbon fiber.