JP2523355Y2 - Conveyor paper thickness detector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial application field) The present invention relates to a device for performing a paper sheet transporting process, for example, a transported sheet thickness detecting device incorporated in an automatic bill depositing and dispensing device, an optical character reader, and the like.

2. Description of the Related Art In a banknote automatic depositing / dispensing apparatus or the like, it is necessary to send sheets of paper such as banknotes one by one to a paper sheet transport path in order to count the papers and appraise them. However, in rare cases, the paper sheets may be conveyed while being overlapped with each other, and in this case, it is impossible to perform the evaluation.

Therefore, usually, the thickness of the paper sheet is detected by the transported paper sheet thickness detecting device, and the presence or absence of the overlap is detected.

A conventional detection device of this type includes a reference roller provided at a paper sheet transport position, and a detection roller which is displaceably pressed against the reference roller. When the detection roller is displaced due to the thickness of the sheet when the leaf is pinched and conveyed, the displacement is converted into an electric signal, and the thickness of the sheet is detected thereby.

In addition, the detection roller is rotatably disposed with a thickness of one sheet separated from the reference roller, and the detection roller is displaced when two or more sheets are conveyed. A transported sheet thickness detecting device configured to detect the thickness of a leaf is also known.

(Problems to be Solved by the Invention) By the way, attached matter such as paper dust adheres to the peripheral surfaces of the reference roller and the detection roller due to the conveyance of the paper sheet. But,
Since the conventional transported sheet thickness detecting device described above does not have means for removing the attached matter attached to the reference roller and the detection roller, the thickness of the sheet cannot be accurately detected by the attached matter. There is a possibility that the detection roller is separated from the reference roller due to the attached matter, and the contact roller hits the reference roller by the reaction thereof, so that an abutting sound is generated and the attached matter enters the main body device to generate mechanical noise.

The present invention has been made by paying attention to the above points, and a conveying sheet thickness detecting device capable of accurately detecting the thickness of a sheet and preventing occurrence of a contact noise of a roller and mechanical noise. It is intended to provide.

(Means for Solving the Problems) The transported paper sheet thickness detecting device of the present invention comprises a plurality of contact pieces that abut one end on each of the peripheral surfaces of the reference roller and the detection roller to scrape off the attached matter on the peripheral surface. And a connecting part integrally formed by being connected to the other ends of the plurality of abutting pieces so that one end of the corresponding abutting piece is linear, and the abutting piece has the other end. It is characterized in that the width is formed smaller than the width of the one end, and each of them is bent independently.

(Operation) An adhering matter remover is brought into contact with each peripheral surface of the reference roller and the detection roller, and the adhering matter remover is slid on the peripheral surfaces when both rollers rotate to scrape off the adhering matter.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 3 is a perspective view of the transported sheet thickness detecting device according to the present invention, and FIG. 4 is an exploded perspective view of the device.

In these figures, reference numeral 1 denotes a casing. The casing 1 has a back wall 1A and both side walls 1B, 1B, and is open on the front side. Inside each side wall 1B, a detection mechanism 2 (L),
(R) is provided. Each of these detection mechanisms 2 has an element bracket 3, and the element bracket 3 includes an extension 3a extending downward. As shown in FIG. 4, the extension 3a is provided with a through hole 3b, and the side wall is formed through the through hole 3b.
It is fitted to the large diameter base 4a of the support shaft 4 protruding from 1B. The extending portion 3a is fitted to the leaf spring 7 in the fitted state.
The pressing piece 7a elastically presses against the side wall 1B. The leaf spring 7 is provided with the edge of the window 1b provided on the side wall 1B and other pressing pieces 7b, 7
It is attached to the side wall 1B by being sandwiched by b.

The element bracket 3 has a storage hole that penetrates vertically.
3c, and the magnetoresistive element 5 is accommodated in the accommodation hole 3c. The magnetoresistive element 5 is a detecting element whose resistance changes in accordance with a change in the magnetic field, and a terminal protruding from the upper surface thereof is inserted into the printed circuit board 6 and soldered. The printed circuit board 6 is connected with a lead wire or the like for sending a detection signal obtained from the magnetoresistive element 5 to a signal processing circuit (not shown). The printed circuit board 6 is mounted on the element bracket 3 by the mounting bracket 8. The mounting bracket 8 has a pair of protruding portions 8a, 8a extending downward, and the projections 3d provided on the outer wall of the element bracket 3 are fitted into square holes provided in these protruding portions 8a. To the element bracket 3
Is fixedly attached with one touch. The spring piece 8b of the mounting bracket 8 reliably presses the printed circuit board 6 against the upper surface of the element bracket 3, thereby preventing the printed circuit board 6 from being detached by an external force such as vibration and positioning the magnetoresistive element 5 at a predetermined position. The tip of the spring piece 8b is bent upward to prevent the printed circuit board 6 from being damaged.

Further, the element bracket 3 has an extension 3e extending in the lateral direction.
The extension 3e projects outward from the side wall 1B. The extension portion 3e is provided with a mounting hole 3f for fixing one end of the coil spring 9, and the other end of the coil spring 9 is fixed to a bent piece 10 formed by bending a part of the side wall 1B outward. I have. Therefore, the coil spring 9 is
A tensile force is applied to 3e in a direction in which the side wall 1B approaches the other bent piece 11. An adjustment screw 11a is threaded into the other bent piece 11 in a thickness direction. On the other hand, the extension 3e has a pin hole 3g.
A pin 12 made of a hard metal which is not deformed is inserted into the pin hole 3g, and the head of the pin 12 is in contact with the tip of an adjusting screw 11a. Therefore, adjusting screw 1
By adjusting the amount of protrusion of 1a and pressing the extension 3e against the elastic force of the coil spring 9, the element bracket 3 was housed in the element bracket 3 by rotating the element bracket 3 by a predetermined amount about the support shaft 4. The magnetoresistive element 5 can be positioned at a predetermined position. A leaf spring 13 is fitted to the other bent piece 11, and a distal end of an adjusting screw 11a is screwed to the leaf spring 13, thereby preventing the screw 11a from being loosened.

In the vicinity of the element bracket 3, a detection lever 14 constituting the detection mechanism 2 is arranged. The detection lever 14 is fitted coaxially with the element bracket 3 on the small diameter portion 4b of the support shaft 4, and is provided with a protruding piece 14a for fixing one end of the coil spring 15 above. The other end of the coil spring 15 is attached to an attachment hole 16 provided in the back wall 1A. Therefore, a rotational force that rotates about the support shaft 4 is applied to the detection lever 14 by the elastic force of the coil spring 15. A storage groove 14b is provided on the upper surface of the detection lever 14.
The detection rod 17 is positioned and dropped into the storage groove 14b. The detection rod 17 is formed of a magnetic material, and is positioned below the detection surface (lower surface) of the magnetoresistive element 5 described above. An annular groove is provided at the tip of the support shaft 4, and a snap ring 18 is fitted in this groove to prevent the detection lever 14 from coming off the support shaft 4.

Incidentally, the element bracket 3 and the detection lever 14 are made of a material having non-conductive and non-magnetic properties, for example, to electrically and magnetically insulate the magnetoresistive element 5 and the detection rod 17 from each other.
It is made of plastic resin. In this case, it is preferable that the element bracket 3 and the detection lever 14 are formed of the same material or at least a material having the same coefficient of thermal expansion.
Can be suppressed.

A support protrusion 14c protrudes from one end of the detection lever 14, and the support protrusion 14c is provided with a through hole 14d. A small diameter portion 19a at the end of the detection roller 19 is rotatably fitted into the through hole 14d, and a snap ring 21 is fitted to a shaft portion 19b protruding from the small diameter portion 19a while being supported by a ball bearing 20. Have been. The detection roller 19 is formed of a metal material in a columnar shape, and has a plurality of annular grooves 19A on a peripheral surface. These annular grooves 19A are set to have a small groove width so that even if a commercially available tape having a width of 1/2 inch (1.27 cm) or more is attached to the paper sheet, the tape can be reliably detected.

As described above, the detection roller 19 whose both ends are supported by the detection lever 14 has a lower reference level because the detection lever 14 is given a rotating force about the support shaft 4 by the elastic force of the coil spring 15. Pressed against roller 22. This reference roller 22 is similarly formed in a cylindrical shape by a metal material,
Annular groove 22 for preventing jam occurrence at the same position as detection roller 19
A is provided. The shaft portions 22a at both ends of the reference roller 22 are inserted through through holes in the side wall 1B and are supported by ball bearings 23. The ball bearings 23 are held by bearing retainers 24. The bearing retainer 24 is provided to absorb backlash of the ball bearing 23, and is fixed to the side wall 1B by a screw member 25. The reference roller 22 supported at the fixed position as described above is disposed at a reference transport position for detecting the thickness of the sheet. One shaft portion 22a of the reference roller 22
3, a helical gear 26 selected to reduce vibration and noise during driving is mounted. The helical gear 26 is manufactured with a high degree of precision so that errors such as eccentricity can be ignored so that the thickness of the sheet can be accurately detected, and is formed to have a large diameter so as to maintain mechanical strength. .

As shown in FIG. 3, a pair of guide plates 27, 27 are disposed in front of the detection roller 19 and the reference roller 22 so as to face each other. These guide plates 27, 27 are provided between the detection roller 19 and the reference roller 22 to guide the sheet 28 through the sheet 28 therebetween, and a plurality of projecting pieces 27a have annular grooves 19A, 22A. It penetrates and extends backward. These projecting pieces 27a are provided to prevent the paper sheet 28 from winding around the detection roller 19 and the reference roller 22.

In addition, as shown in FIG.
A stopper 14e is protruded from c, and the stopper 14e is provided at the edge of the opening of the back wall 1A when the detection lever 14 is unnecessarily rotated.
Abuts on 1a to prevent its rotation.

The coil spring 15 that applies a rotating power to the detection lever 14 has a function of pulling the detection lever 14 so that the detection lever 14 does not rattle and rotate on the support shaft 4 when the paper sheet 28 passes. doing. The elastic force of the coil spring 15 is such that the time required for the detection roller 19 to instantaneously separate from the reference roller 22 when hitting the end of the paper sheet 28 and return to the top of the paper sheet 28 passes through the commercially available tape. Is set to a value that is sufficiently smaller than the time required for.

In the transported sheet thickness detecting device having the above configuration,
When the sheet 28 is fed between the guide plates 27, 27 and the reference roller 22 is driven to rotate by the driving of the helical gear 26, the detection roller 19 is driven to rotate. The leaves 28 are pinched and transported. When the sheet 28 is conveyed, the detection roller 19 separates (displaces) from the reference roller 22 by the thickness thereof against the elastic force of the coil spring 15 and rotates the detection lever 14 in accordance with the thickness of the sheet 28. Move. Therefore,
Since the detection rod 17 is displaced with respect to the detection surface of the magnetoresistive element 5, the resistance value of the magnetoresistive element 5 changes, and the element 5 outputs a detection signal. Therefore, since this detection signal is supplied to the signal processing circuit, it is possible to know the thickness of the paper sheet 28, that is, whether or not one or more paper sheets 28 have been conveyed.

On the other hand, when the paper sheet 28 is conveyed by the reference roller 22 and the detection roller 19, an adhering substance such as paper dust adheres to the peripheral surface of these rollers.

FIG. 1 is a perspective view of the attached matter remover 30 according to the present invention, and FIG. 2 is a sectional view showing an attached state of the attached matter remover 30.

The deposit remover 30 is made of a stainless leaf spring material, and includes a connecting portion 30A and a plurality of contact pieces 30B formed integrally with the connecting portion 30A as shown in FIG. Become. These abutment pieces 30B are formed with a small width at the connecting portion 30A side and are each independently bent, and furthermore, the leading edges thereof are formed linearly so as to abut on the roller peripheral surface in a straight line. . Therefore, these contact pieces 30B
Are reliably and independently abutted against the roller peripheral surface. Through holes 30a, 30a are provided at both ends of the connecting portion 30A. On the other hand, the holding plate 31 for holding the attached matter removing device 30 fixedly has through holes 31a, 31a at positions corresponding to both ends. The holding plate 31 is formed of a slightly thicker stainless plate so as to have rigidity. Therefore, when held by the holding plate 31, the connecting portion 30A of the attached matter removing device 30 is kept straight without bending.

The attached matter remover 30 having the above configuration is mounted as follows. That is, as shown in FIG. 2, FIG. 3, and FIG. 4, the remover 30 for removing the adhering matter on the detection roller 19 has the respective contact pieces 30B arranged along the tangential direction of the detection roller 19. The screw member 32 is inserted through the through-hole 30a of the connecting portion 30A and the through-hole 31a of the holding plate 31 in a state where the leading edge of the contact piece abuts on the peripheral surface of the roller 19. Member 32 to back wall 1
By screwing into A, it is fixed to the back wall 1A. Further, a remover 30 for removing deposits on the reference roller 22 is provided.
In the state where each contacting piece 30B is arranged along the tangential direction of the reference roller 22 and the leading edge of the contacting piece is in contact with the peripheral surface of the roller 22, the back wall is similarly connected via the screw member 32. Fixed to 1A. In this case, it is preferable that the leading edge of the contact piece 30B of each remover 30 be pressed against the peripheral surface of the roller 19 or 22 with a predetermined pressure, thereby securely contacting the leading edge with the peripheral surface of the roller.

 Next, the operation of the deposit remover 30 will be described.

In FIG. 2, a paper sheet 28 is a reference roller 22 and a detection roller.
When the reference roller 22 is driven to rotate in the direction of the arrow, the leading edge of the contact piece 30B of the lower attached matter remover 30 continuously slides on the peripheral surface of the reference roller 22.
Therefore, when an attached matter such as paper dust is attached to the peripheral surface of the reference roller 22, the attached matter is scraped off by the contact piece 30B. Further, since the detection roller 19 is driven to rotate in the direction of the arrow, the leading edge of the contact piece 30B of the attached matter remover 30 above continuously comes into sliding contact with the peripheral surface of the detection roller 19. Therefore,
Similarly, the adhering matter adhering to the peripheral surface of the detection roller 19 is scraped off by the contact piece 30B.

As described above, when the attached matter is scraped off by the attached matter remover 30, the detection roller 19 is displaced by the thickness of the sheet 28, so that the thickness of the sheet 28 can be detected with high accuracy.
Further, since the detection roller 19 is separated from the reference roller 22 by the adhered substance and does not hit the roller 22 by the reaction thereof, it is possible to prevent the contact noise of the roller. Further, since no extraneous matter enters the main unit, it is possible to prevent mechanical noise and also to prevent a failure or the like caused by the extraneous matter.

In the above embodiment, the deposit remover 30 may be formed of another elastic member such as urethane rubber.

In addition, the present invention can of course be applied to a transported sheet thickness detecting device provided with a reference roller and a detecting roller which are not cylindrical but are annular.

(Effects of the Invention) According to the present invention, a plurality of abutting pieces that abut one end against each peripheral surface of the reference roller and the detection roller to scrape off the attached matter on the peripheral surface, and one end of the corresponding contact piece is linear. And a connecting part integrally formed by being connected to the other end side of the plurality of contact pieces so that the width of the other end of the plurality of contact pieces is equal to the width of one end. As a result, the distortion generated due to the improper mounting of the contact piece can be kept small, and the small distortion can be absorbed by the other end. Therefore, regardless of the mounting accuracy of the adhering matter remover, one end of the abutting piece is always in uniform contact with the peripheral surface of the roller, so that the paper adhering to the peripheral surface of these rollers is easily assembled. Deposits such as powder can be reliably scraped off and removed. This makes it possible to accurately detect the thickness of the paper sheet, to prevent the occurrence of contact noise between both rollers and mechanical noise, and to prevent the occurrence of a failure due to an adhering material. A sensing device can be provided.

[Brief description of the drawings]

1 and 2 are perspective views showing the attached matter removing device according to the present invention together with a holding plate and sectional views showing the attached state thereof, and FIGS. 3 and 4 are transport sheet thickness detecting devices according to the present invention. FIG. 2 is a perspective view of the device and an exploded perspective view thereof. 1A ... back wall, 1B ... side wall, 2 ... detection mechanism part, 3 ... element bracket, 5 ... magnetoresistive element, 14 ... detection lever, 17 ... detection rod, 19 ... detection roller, 22 ... reference roller, 28 ... paper leaf , 30…
Debris remover, 30B: contact piece, 31: holding plate.

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-58-135908 (JP, A) JP-A-50-134657 (JP, A) JP-A-57-47431 (JP, A) 116693 (JP, U)

Claims (1)

(57) [Scope of request for utility model registration] A reference roller provided at a transport position of a paper sheet whose thickness is to be detected, and a detection roller which presses against the reference roller to transport the paper sheet and is displaced in accordance with the thickness of the paper sheet. A plurality of contact pieces that abut one end on each peripheral surface of the reference roller and the detection roller to scrape off the attached matter on the peripheral surface, and one end of the contact piece is linear. And a connecting part integrally formed by being connected to the other ends of the plurality of abutting pieces so that the abutting pieces have a width at the other end equal to the width at the one end. A sheet thickness detecting device for conveying a sheet, wherein the sheet thickness detecting device is formed to be smaller than each other and bent independently.