JPH0661850U - Thickness detection device for paper sheets - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a paper sheet thickness detection device that does not require delicate adjustment when setting the detection roller, does not cause an error during use, and can detect the position of tape sticking. [Structure] A reference roller 12 serving as a thickness measurement reference, and a detection roller 13 capable of swinging in contact with the reference roller, and thickness detection for detecting the thickness of a sheet inserted between both rollers. In the device, the disc-shaped member 16 is provided coaxially with the detection roller 13 and has a corrugated peripheral edge, and the disc-shaped member 16 is provided so as to face the peripheral surface of the disc-shaped member 16, and the peripheral edge is detected. Detection means (sensor 17) for
It is characterized by comprising a thickness determining means for determining the thickness of the paper sheet based on the detection result by the detecting means.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a sheet thickness detecting device for detecting the thickness of a sheet being conveyed.

[0002]

[Prior art]

 In a conventional thickness detecting device for detecting the thickness of paper sheets, a reference roller 1 and a detecting roller 2 are provided so as to face each other as shown in FIG. 8, and the detecting roller 2 can swing up and down about a shaft 3 as a fulcrum. A lever 5 is attached to one end of the lever member 4, a light shield plate 6 is attached to the other end of the lever member 4, and an optical sensor 7 such as a photo interrupter is arranged facing the light shield plate 6. . The lever member 4 is urged upward by a spring 8 at a position separated from the shaft 5 with the fulcrum shaft 3 interposed therebetween, and the urging force pushes the detection roller 2 downward. The member 4 is locked by the locking member 9, and the gap d between the detection roller 2 and the reference roller 1 is set to be wider than the thickness t of the paper sheet P and smaller than the thickness 2t of two sheets. The lever member 4 is used for enlargement so that it can be easily detected because the amount of movement of the detection roller 2 due to the thickness of the paper sheet P is extremely small.

In such a device, if only one sheet P is inserted, the detection roller 2 does not move up and down, and the detection result of the optical sensor 7 does not change. When two sheets P are stacked, the detection roller 2 is pushed up, the light shielding plate 6 moves via the lever member 4, and the detection result of the optical sensor 7 changes. This is to detect the thickness of paper sheets.

[0004]

[Problems to be solved by the device]

 However, in the above-mentioned conventional apparatus, the gap d between the detection roller 2 and the reference roller 1 must be set to be wider than the thickness of the paper sheet P and smaller than the thickness of two sheets, which makes the work extremely difficult. It will be Even if the gap d can be set accurately, the gap d may gradually change during use. Further, since the mechanism having the lever member 4 is adopted, there is a drawback that it occupies a large space.

Further, in the conventional apparatus, although it is possible to distinguish the sheet P fed by one sheet from the sheet P other than that (sheets fed by two sheets or tape-attached), the sheets overlapped by two sheets. It is impossible to distinguish between leaves and paper sheets with tape.

In view of this, the present invention eliminates the need for delicate adjustment when setting the detection roller, does not cause a deviation due to use, and can detect the position of tape sticking, and can detect the thickness of paper sheets. The purpose is to provide a device.

[0007]

[Means for Solving the Problems]

 As a means for solving the problems of the above-mentioned conventional techniques, the present invention has a reference roller that serves as a reference for measuring the thickness and a detection roller that is capable of swinging in contact with the reference roller. In a thickness detecting device for detecting the thickness of a sheet to be inserted, a disc-shaped member provided coaxially with the above-mentioned detection roller and having a wavy convex portion formed on the periphery thereof, and the disc-shaped member. A detecting means for detecting the convex portion, which is provided so as to face the convex portion on the periphery of the sheet, and a thickness determining means for determining the thickness of the paper sheet based on the detection result of the detecting means. According to a second aspect of the present invention, the slope of the convex portion is formed by a part of a logarithmic spiral.

[0008]

[Action]

 A sheet of paper enters between the reference roller and the detection roller, the detection roller rotates, and the disk-shaped member also rotates. At this time, the detection means detects the peripheral edge. Since the peripheral edge is formed in a wave shape, a signal in which the detection state and the non-detection state are alternately repeated is obtained. However, since the position of the detection roller differs depending on the thickness of the paper sheet, the detection means scans different heights of the peripheral edge of the disk-shaped member, and different signals are obtained depending on the thickness. Therefore, the determination means determines the thickness of the paper sheet based on this signal.

[0009]

【Example】

 The present invention will be described below with reference to the embodiments shown in the drawings. FIG. 1 is a perspective view showing a cross section of a part of a detection device according to the present invention. Two shafts 10 and 11 are provided in parallel, and a reference roller 12 is fixed to a lower first shaft 10. It is attached to the upper second shaft 11, and the measuring rollers 14, 14, 14 constituting the detection roller 13 which are divided into three in the direction orthogonal to the axis are pressed downward via the elastic body 15 such as rubber. It is attached tightly. Each measuring roller 14 is located on both sides of the roller portion 14a, the peripheral surface of which is in contact with the peripheral surface of the reference roller 12, and has a smaller diameter than the roller portion 14a and an outer peripheral edge formed in a wavy shape. The disk-shaped members 16 and 16 are formed. A sensor 17 (photointerrupter) is provided above the disc-shaped members 16 and 16 so as to sandwich the upper ends of the disc-shaped members 16 and 16, and the sensors 17 are mounted on the sensor support member 18. It is installed.

The disc-shaped member 16 is composed of an array of convex portions 16 a having a ridge-shaped triangular shape on the peripheral edge thereof, and is preferably an isosceles triangular shape.

As the positional relationship between the disc-shaped member 16 and the sensor 17 is shown in FIG. 2 as seen from the axial direction and as shown in FIG. 3 as seen from the conveyance direction, as the disc-shaped member 16 rotates, The detection points of the sensor 17 alternately detect the convex portions 16a and the concave portions 16b on the peripheral edge of the disk-shaped member 16. The disc-shaped member 16 in FIG. 2 shows a state (standby state) when nothing is sandwiched between the rollers 12 and 13. If the disc-shaped member 16 rotates in this state, The sensor 17 detects the position of the uppermost one-dot chain line.

When the paper sheet P enters between the rollers 12 and 13, the reference roller 12 is fixedly attached to the first shaft 10 while the measuring rollers 14 and 14 that constitute the detection roller 13 are provided. Are attached to the second shaft 11 via the elastic body 15, so that the measurement rollers 14, 14 ... Are lifted by the thickness of the paper sheet P. As a result, the disk-shaped member 16 also rises, and the position detected by the detection point by the sensor 17 is shown in Fig. 2 as a sheet of paper, a sheet of paper with a tape, and a stack of two sheets of paper. Each of these changes as shown in the figure.

That is, in the standby state in which the paper sheet P is not sandwiched between the measuring rollers 14, 14 ... And the reference roller 12, the sensor 17 is placed at a position close to the apex of the convex portion 16 a of the disk-shaped member 16. It will pass relatively. When the paper sheet P advances between the rollers 12 and 13, the measurement rollers 14, 14 ... Ascend, and the position where the sensor 17 passes (which height position of the convex portion 16a passes) changes due to this rise. However, the thicker the paper sheet P that has entered is, the more it passes through the position where the convex portion 16a is low. Although the sensor 17 is depicted as moving in FIG. 2, the sensor 17 is actually in a fixed position and the disc-shaped member 16 moves up and down.

FIG. 4 shows waveforms output from the sensor 17 under the above-described conditions (standby state, passage of one sheet, passage of tape-attached sheets and passage of two-layered sheets). While the detection point of the sensor 17 passes through the concave portion 16b of the disk-shaped member 16, it is in a light-transmitting state, and while passing through the convex portion 16a, it is in a light-shielding state. In FIG. 4, the timing is changed from light-shielding to light-transmitting, and the light-shielding time (light-shielding time in FIG. 4) increases as the measuring roller 14 rises, that is, the thicker the paper sheet that has entered. ) Becomes longer.

FIG. 5 shows a situation in which the sensor 17 passes through the convex portion 16 a of the disc-shaped member 16. With reference to the line A through which the sensor 17 passes in the standby state, the case of feeding one sheet is shown as B and the case of feeding two sheets is shown as C. When one sheet of paper enters between the rollers 12 and 13, the disc-shaped member 16 moves by the thickness t _{1 of the} sheet of paper, and the distance at which the sensor 17 shields light is x ₁ . When a paper sheet having two overlapping sheets enters between the rollers 12 and 13, the disc-shaped member 16 moves by the thickness t _{2 of the} paper sheet, and the distance at which the sensor 17 is shielded from light is x ₂ . At this time, between the movement amount (Δt = t ₂ −t ₁ ) due to the difference of the medium and the difference (Δx = x ₁ −x ₂ ) of the amount detected by the sensor 17, Δx = (Δx / 2) xtan θ holds. Since Δx is larger than Δt and is a value directly measured by the sensor 17, it is easier to measure and compare than Δt. It is also possible to calculate Δt from the measured value of Δx.

Similarly, in the case of banknotes, for example, the difference in thickness between single-fed banknotes and tape-bonded banknotes, or the difference in the thickness between double-fed banknotes and tape-bonded banknotes is expanded and compared. The banknotes of can be reliably classified.

Further, in the case of the above-described embodiment, since the detection roller 13 is divided into three, when the tape-pasted bill is inserted, only the detection roller corresponding to the position where the tape is pasted is redundant. Since the other rollers show the same detection result as normal single-sheet feeding, it is also possible to detect the position where the tape is attached by examining the detection result.

FIG. 7 shows an embodiment corresponding to claim 2. In the above-mentioned embodiment, as shown in FIG. 6, the rotation of the disk-shaped member 16 causes the radial line of the disk-shaped member 16 and the sloped surface 16c of the convex portion 16a. The intersecting angles ψ ₁ , ψ ₂ are slightly different due to the difference in radius, and ψ ₁ <ψ ₂ .

Since the change in the radius described above results in a change in the position of the detection line, the position differs between the detection line L ₁ at the time of standby and the detection line L ₂ at the time of measurement, and the mounting position of the sensor 17 (installation Error and changes over time).

Therefore, the angles θ ₁ and θ ₂ used for detecting the thickness are also different, and it may be difficult to accurately calculate the angles.

Therefore, as shown in FIG. 7, the shape of the slope 16c of the convex portion 16a of the disk-shaped member 16 is a logarithmic spiral (a spiral whose length changes geometrically every time the radius vector advances by a constant angle. In this spiral curve, the angle between the tangent line and the radius at any one point on the curve has a constant value.) Therefore, even if the radius is different, the angles ψ ₁ , ψ ₂ The angle ψ ₀ corresponding to is constant, and the angle θ ₀ is also constant. Therefore, accurate calculation can be performed regardless of the positions of the detection lines L ₁ and L ₂ , and detection can be performed with higher accuracy.

[0022]

[Effect of device]

 As described above, according to the present invention, since the setting adjustment of the gap between the reference roller and the detection roller is unnecessary, it is not necessary to make a fine adjustment when setting the detection roller, and it is possible to use it for a long time. It is possible to obtain a paper sheet thickness detection device which can discriminate between a paper sheet having two sheets of paper and a paper sheet having a tape attached thereto without causing any error. Also, without using a lever member, the detection means (sensor) faces the disk-shaped member having the same diameter as that of the roller, so that the size of the device is not increased and the thickness can be detected in a compact structure. It can be a device.

Further, by forming the slope of the wavy convex portion formed on the peripheral edge of the disc-shaped member as a convex curved surface based on logarithmic screwing as in claim 2, even if the detection line by the sensor changes. Accurate detection is possible, and more highly accurate thickness detection is possible.

[Brief description of drawings]

FIG. 1 is a perspective view, partly in section, showing an embodiment of a sheet thickness detecting device according to the present invention.

FIG. 2 is an enlarged view showing a main part of the apparatus.

FIG. 3 is a side view of the same.

FIG. 4 is an explanatory view showing a detection result by the device.

5 is a detailed explanatory diagram of FIG. 2. FIG.

FIG. 6 is an explanatory diagram showing a relationship with a detection line when the slope of the convex portion of the disk-shaped member is formed by a straight line.

FIG. 7 is an explanatory view showing a relationship with a detection line when the slope of the convex portion is formed by a logarithmic spiral.

FIG. 8 is a side view showing a conventional technique.

[Explanation of symbols]

 1, 12 Reference roller 2, 13 Detection roller 14 Measurement roller 15 Elastic body 16 Disc member 16a Convex portion 16b Recessed portion 16c Slope 17 Sensor

Claims (2)

[Scope of utility model registration request] 1. A reference roller serving as a thickness measurement reference, and a detection roller which is in contact with the reference roller and can swing.
In a thickness detecting device for detecting the thickness of a paper sheet inserted between both rollers, a disc-shaped member provided coaxially with the detection roller and having a corrugated convex portion formed on the periphery thereof, It is provided with a detecting means which is provided so as to face the convex portion on the peripheral edge of the plate-like member, and which detects the convex portion, and a thickness judging means which judges the thickness of the paper sheet based on the detection result of this detecting means. An apparatus for detecting the thickness of paper sheets. 2. The paper sheet thickness detecting apparatus according to claim 1, wherein the slope of the wavy convex portion formed on the peripheral edge of the disk-shaped member is a convex curved surface based on a logarithmic spiral.