JP4653706B2 - Paper sheet thickness detector - Google Patents

Description

  The present invention relates to a thickness detector that detects the thickness of a banknote, for example, applied to a banknote processing machine such as a banknote sorter that sorts and organizes banknotes, or an automatic depositing machine that deposits and withdraws banknotes. .

As this type of thickness detection device, for example, a device as shown in FIG. 8 is known.
That is, the thickness detection device 101 includes a reference roller 103 attached to the rotation shaft 102, and a metal detection roller 105 is provided on the upper side of the reference roller 103. The detection roller 105 is opposed to the upper surface portion of the reference roller 103 in a contact or non-contact state, and the bill P passes between the detection roller 5 and the reference roller 3.

  As shown in FIG. 9, a plurality of detection rollers 105 are arranged at predetermined intervals along the axial direction of the reference roller 103, and are attached to the distal end portion of the detection lever 107 via the rotation shaft 104. The base end portion of the detection lever 107 is connected to the mounting portion 108 via the rotation shaft 106, and the detection lever 107 rotates about the rotation shaft 106 to move the tip end side up and down to move the detection roller 105. The reference roller 103 is displaced in a direction in which it comes into contact with or separates from the reference roller 103.

  A detection piece 122 protrudes from the front end portion of the detection lever 107, and a measurement sensor 109 serving as detection means for measuring the amount of displacement of the detection roller 105 is opposed to the lower surface portion of the detection piece 122. .

  A roller 111 is provided on the top surface of the tip of the detection lever 107, and the top of the roller 111 is in contact with the top of the spring material 110 as a pressing means. The base end portion side of the spring material 110 is attached to the attachment portion 108. By pressing the roller 111 with the spring material 110 and pressing the detection roller 105 against the reference roller 103, detection errors due to unnecessary vibrations such as the jumping up of the detection lever 107 and the influence of the swelling of the bills P are suppressed. ing.

  The measurement sensor 109 is composed of, for example, a potentiometer or an MR sensor, and detects the rotation angle of the rotary shaft 106, whereby the thickness of the banknote P can be detected.

  A plurality of thickness detectors are arranged on the transport system of one cash processor, and the position of the detection roller 105 is shifted in the width direction of the bill. This makes it possible to cover the thickness detection of the entire bill.

  In the configuration described above, when the bill P is introduced between the detection roller 105 and the reference roller 103 and passes, the detection roller 105 is displaced upward from the reference roller 103, and the amount of displacement is measured by the measurement sensor 109. Based on the measured value, the thickness of the banknote P is detected.

  By the way, since the speed of the conveyed banknote P is as high as several m / s, when the leading end abuts on the detection roller 105 when being introduced between the detection roller 105 and the reference roller 103, the detection roller A large impact is applied to 105. For this reason, as shown in the thickness measurement curve of FIG. 10, the detection roller 105 is flipped up in the direction of rising relative to the reference roller 103, and a measurement blank time is generated.

Since the bill P is transported several millimeters during the measurement blank time, the thickness of the bill P cannot be detected during this time. Therefore, it is necessary to reduce the jump of the detection roller 105 as soon as possible. For this reason, normally, the pressing force of the leaf spring 110 as the pressing means is increased (for example, see Patent Document 1).
JP 2005-154064 A

  However, when the pressing force of the leaf spring 110 is increased, the frictional resistance between the detection roller 105 and the reference roller 103 increases, so that the perpendicularity between the detection lever 107 that supports the detection roller 105 and the rotation shaft 102 of the reference roller 103 is increased. If there is any deviation as shown in FIG. 11, a force in the rotation axis direction of the reference roller 103 acts on the detection roller 105. As a result, as shown in FIG. 12, a bending stress is generated on the rotating shaft 104 and the outer ring 112 of the detection roller 105, causing a problem that the retainer 114b of the bearing 114a and the outer ring 112 are seized and locked. The rotating shaft 104 is inserted into the inner ring 113.

  Further, since the outer ring 112 of the detection roller 105 is inclined with respect to the reference roller 103, the detection roller 105 vibrates with respect to the surface portion of the reference roller 103, and there is a defect that the accuracy of the thickness detection signal is deteriorated. Has occurred.

  Further, when the pressing force of the leaf spring 110 is increased, the life of the bearing of the detection roller 105 is shortened. Further, the wear of the reference roller 103 and the detection roller 105 is promoted, and the reference roller 103 is deeply worn, and the bill thickness measurement accuracy by the detection roller 105 is lowered.

  As described above, since the mechanism presses the detection roller 105 with a high spring pressure for the purpose of suppressing the jumping time of the detection roller 105, the detection roller 105 is inclined and only the thickness detection accuracy is lowered. In addition, there is a problem that the life of the reference roller 103 and the detection roller 105 is short.

  The present invention has been made paying attention to the above circumstances, and the first object is to prevent the detection roller from being seized without increasing the mounting accuracy of the detection lever, and the second object is to An object of the present invention is to provide a paper sheet thickness detection device capable of quickly returning the jump of a detection roller even in a state where the pressing force of the pressing means is low.

  In order to solve the above-described problem, the first aspect of the present invention includes a reference roller, a detection roller that is provided to face the reference roller, and allows paper sheets to pass between the reference roller and the detection roller. A detection lever attached to one end side, and the other end side of the detection lever are movably attached so that the detection roller moves along the direction in which the detection roller comes into contact with and separates from the reference roller and the axial direction of the reference roller Attaching means, pressing means for elastically pressing the detection roller toward the reference roller, and separation of the detection roller from the reference roller when a sheet is present between the reference roller and the detection roller Detecting means for detecting the thickness of the paper sheet based on the amount of displacement in the direction in which the paper sheet is moved.

  According to a fifth aspect of the present invention, there is provided a reference roller, a detection roller that is provided opposite to the reference roller and allows paper sheets to pass between the reference roller, and a detection lever that attaches the detection roller to one end side. The detection lever is positioned upstream of the detection roller in the sheet conveyance direction and is opposed to the reference roller so that the conveyed sheet is brought into contact with the detection roller. A contact roller, mounting means for movably attaching the other end side of the detection lever so that the detection roller and the contact roller move in a direction in contact with and away from the reference roller, and the detection roller elastically And the thickness of the paper sheet based on the amount of displacement of the detection roller in the direction away from the reference roller when the paper sheet exists between the reference roller and the detection roller. Characterized by comprising a detecting means for detecting.

  According to the first aspect of the present invention, the detection roller can be prevented from seizing without increasing the detection lever mounting accuracy, and the second aspect of the present invention allows the detection roller to quickly jump even when the pressing force of the pressing means is low. Thus, it is possible to provide a paper sheet thickness detection device that can be returned to the above.

Hereinafter, the present invention will be described in detail with reference to embodiments shown in the drawings.
FIG. 1 is a front view showing a paper sheet thickness detection apparatus according to an embodiment of the present invention.
This thickness detection device is provided, for example, in a banknote inspection section of a banknote transport system, and detects the taking of two banknotes, sticking of a tape, and the like.

  The thickness detection device 1 includes a reference roller 3 attached to the rotary shaft 2, and a metal detection roller 5 is provided on the upper side of the reference roller 3. The detection roller 5 is opposed to the upper surface portion of the reference roller 3 in a contact state or a non-contact state, and a bill P passes between the detection roller 5 and the reference roller 3.

  A plurality of detection rollers 5 are arranged at predetermined intervals along the axial direction of the reference roller 3, and are attached to the distal end portion of the detection lever 7 via the rotary shaft 4. The base end portion of the detection lever 7 is movably attached to an attachment portion 8 as attachment means as will be described in detail later.

  Further, a detected piece 22 protrudes from the front end side of each detection lever 7, and a measurement sensor 9 as a detecting means for measuring the displacement amount of the detection roller 5 is separated from the lower surface portion of the detected piece 22. Opposed.

  Further, a roller 11 is provided on the top surface of the tip of the detection lever 7, and the top of the roller 11 is in contact with the top of the spring material 10 as a pressing means. The base end portion side of the spring material 10 is attached to the attachment portion 8. By pressing the roller 11 with the spring material 10 and pressing the detection roller 5 against the reference roller 3, it is possible to suppress detection errors due to unnecessary vibrations such as the detection lever 7 jumping up and the influence of the swelling of the bills P. ing.

  The measurement sensor 9 is composed of, for example, a potentiometer or an MR sensor, and detects the rotation angle of the rotary shaft 6, whereby the thickness of the banknote P can be detected.

  A plurality of thickness detectors are arranged on the transport system of one cash processing machine, and the position of the detection roller 5 is shifted in the banknote width direction. This makes it possible to cover the thickness detection of the entire bill.

  In the configuration described above, when the bill P is introduced between the detection roller 5 and the reference roller 3 and passes, the detection roller 5 is displaced upward from the reference roller 3, and the amount of displacement is measured by the measurement sensor 9. Based on the measured value, the thickness of the banknote P is detected.

  By the way, since the speed of the conveyed banknote P is as high as several m / s, the detection roller 5 is brought into contact with the detection roller 5 when introduced between the detection roller 5 and the reference roller 3. 5 has a big impact. For this reason, as shown in the thickness measurement curve of FIG. 10, the detection roller 5 is flipped up in the direction of rising relative to the reference roller 3, and a measurement blank time is generated.

  Since the bill P is transported several millimeters during the measurement blank time, the thickness of the bill P cannot be detected during this time. Therefore, it is necessary to reduce the jump of the detection roller 5 as soon as possible. For this reason, normally, the pressing force of the leaf spring 10 as the pressing means is increased.

FIG. 2 shows the mounting structure of the detection lever 7 described above.
That is, reference numeral 15 in the figure denotes a movable block 15 that pivotally connects the base end side of the detection lever 7 via a first rotation shaft 16, and this movable block 15 is orthogonal to the first rotation shaft 16. It is rotatably attached to the attachment portion 8 via a second rotating shaft 17 provided along the direction. The first rotating shaft 16 is provided in parallel with the rotating shaft 4 of the detection roller 5, and the second rotating shaft 17 is provided along a direction orthogonal to the first rotating shaft 16.

  The detection lever 7 rotates about the first rotation shaft 16, thereby moving the detection roller 5 in the direction of contacting and separating from the reference roller 3, and rotating about the second rotation shaft 17. The detection roller 5 can be moved along the axial direction of the reference roller 3.

  By the way, when the pressing force of the leaf spring 10 is increased, the frictional resistance between the detection roller 5 and the reference roller 3 increases, and therefore the perpendicularity between the detection lever 7 that supports the detection roller 5 and the roller rotation shaft 2 of the reference roller 3. However, as shown in FIG. 3, if there is any deviation, a force in the rotation axis direction of the reference roller 3 acts on the detection roller 5.

However, at this time, the detection lever 7 rotates in the axial direction of the reference roller 3 around the second rotation shaft 17 by the rotation forcing force of the reference roller 3, so that bending stress as in the related art is applied to the detection lever 7. Without acting, the force to tilt the bearing 14a of the detection roller 5 is reduced. Therefore, the retainer 14b of the bearing 14a and the outer ring 12 can be prevented from being seized and locked. In the figure, reference numeral 13 denotes an inner ring into which the rotating shaft 4 is inserted.
Further, since the outer ring 12 of the detection roller 5 is not inclined with respect to the reference roller 3, vibration of the detection roller 5 can be prevented and the accuracy of the thickness detection signal can be maintained well.

On the other hand, the reference roller 3 is made of a material having a surface hardness of HRc 70 or more.
The outer ring 12 of the detection roller 5 that is in contact with the reference roller 3 is generally made of bearing steel such as SUJ2. Since the hardness of this bearing steel is about Rc60, the hardened and tempered steel is at most HRc60-65. That is, since the reference roller 3 and the detection roller 5 are made of the same steel metal, there is a problem that adhesive wear occurs.

  In order to solve this, the reference roller 3 is composed of a hard facing layer having a hardness of HRc 70 or more. Specifically, the reference roller 3 is manufactured by spraying a wear resistant material such as cemented carbide (WC-Co) or powder high speed (carbide, TiN) on a steel roller and grinding it.

  Thereby, the reference roller 3 with high wear resistance and high dimensional accuracy can be manufactured relatively economically. Since the reference roller 3 is a carbide-based or nitride-based wear resistant material, adhesive wear with the detection roller 5 can be prevented. Therefore, the wear of the detection roller 5 is also reduced, and the life can be greatly improved as compared with a simple steel product, and the economical reference roller 3 can be provided as a whole.

  According to the above-described embodiment, even if the mounting accuracy of the detection lever 7 is not high, the detection roller 5 does not incline with respect to the reference roller 3, so the outer ring 12 and the rotation shaft of the detection roller 5 Therefore, seizure of the retainer 14b due to the inclination of 4 can be prevented, and the life of the detection roller 5 can be improved.

  Furthermore, since the uneven wear of the outer ring 13 of the detection roller 5 and the wear mark on the surface of the reference roller 3 are greatly reduced, the initial measurement accuracy can be maintained.

FIG. 5 shows a first modification of the connection structure of the detection lever 7.
In the first modification, the detection lever 7 is connected to the attachment portion 8 via the ball joint 25. The ball joint 25 is attached to the attachment portion 8 via a plurality of rollers 26.

  By using the ball joint 25 in this way, the detection lever 7 is directed in the direction coinciding with the rotation direction of the reference roller 3 regardless of the accuracy at the time of attachment, and is detected being pressed against the reference roller 3 by the spring material 10. The roller 5 automatically contacts the reference roller 3 without tilting.

FIG. 6 shows a second modification of the connection structure of the detection lever 7.
In the second modification, the detection lever 7 is connected to the mounting portion 8 via an elastic body 31 such as rubber.

  By using the elastic body 31 in this way, the direction of the detection lever 7 and the posture of the detection roller 5 with respect to the reference roller 3 can be easily corrected by the pressing force of the spring material 10 and the rotation forcing force of the reference roller 3.

FIG. 7 is a configuration diagram showing a thickness detection apparatus according to the second embodiment of the present invention.
In addition, the same number is attached | subjected about the part same as the part shown in FIG. 1, and the description is abbreviate | omitted.

  In this embodiment, the contact roller 41 is attached so as to be located upstream of the detection roller 5 of the detection lever 7 in the bill conveyance direction. The contact roller 41 is attached in parallel with the detection roller 5 at a predetermined interval and in contact with the reference roller 3. The abutting roller 41 is not a metal roller but an elastic body such as rubber.

  In this configuration, when the leading end of the banknote P being conveyed contacts the contact roller 41, the impact causes the detection lever 7 to rotate upward about the rotation shaft 6 and the detection roller 5 jumps upward. Since the contact roller 41 is an elastic roller, the detection roller 5 jumps up more than the detection roller 5 alone.

  The interval between the contact roller 41 and the detection roller 5 is set so that the timing when the leading edge of the bill P enters the position of the detection roller 5 and the timing until the detection roller 5 jumps up and returns. Has been.

  Thereby, the banknote P advances without strongly colliding with the detection roller 5, and the detection roller 5 can follow the thickness of the banknote P.

  According to this embodiment, it is possible not only to improve the thickness measurement accuracy but also to reduce the pressing force of the spring material 10 that has suppressed the spring-up of the detection roller 5 and the detection lever 7 due to the collision with the banknote P. It becomes. Therefore, the bearing life of the detection roller 5 and the wear of the reference roller 3 can be reduced.

  Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. Various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the above-described embodiments. For example, you may delete some components from all the components shown by embodiment mentioned above. Furthermore, you may combine the component covering different embodiment suitably.

The front view which shows the thickness detection apparatus of the paper sheets which is the 1st Embodiment of this invention. The figure which shows the connection structure of the detection lever of the thickness detection apparatus of FIG. The figure which shows the state which has a deviation in the attachment angle of the detection lever of the thickness detection apparatus of FIG. The figure which shows the state by which the position of the detection roller attached to the detection lever of FIG. 3 was corrected. The figure which shows the 1st modification of the connection structure of the detection lever of FIG. The figure which shows the 2nd modification of the connection structure of the detection lever of FIG. The front view which shows the thickness detection apparatus of the paper sheets which is the 2nd Embodiment of this invention. The front view which shows the thickness detection apparatus of the conventional paper sheets. The side view which shows the thickness detection apparatus of FIG. The graph which shows the thickness measurement curve of the banknote by the thickness detection apparatus of FIG. The figure which shows the state in which there is a deviation in the attachment angle of the detection lever of the thickness detection apparatus of FIG. The figure which shows the state which the detection roller attached to the detection lever of FIG. 11 locks.

Explanation of symbols

P ... paper sheets, 3 ... reference roller, 5 ... detection roller, 6 ... first rotating shaft, 7 ... detection lever, 8 ... attachment portion (attachment means), 9 ... measurement sensor (detection means), 10 ... spring Material (pressing means),
17 ... second rotating shaft, 25 ... ball joint, 31 ... elastic body, 41 ... contact roller.

Claims (10)

A reference roller;
A detection roller that is provided opposite to the reference roller and allows paper sheets to pass between the reference roller;
A detection lever for attaching the detection roller to one end side;
Mounting means for movably attaching the other end side of the detection lever so as to move along the direction in which the detection roller is in contact with and away from the reference roller and the axial direction of the reference roller;
Pressing means for elastically pressing the detection roller toward the reference roller;
Detection means for detecting the thickness of the paper sheet based on a displacement amount of the detection roller in a direction away from the reference roller when the paper sheet exists between the reference roller and the detection roller; ,
A thickness detection device for paper sheets, comprising: The attachment means has a first rotating shaft and a second rotating shaft orthogonal to the first rotating shaft, and the detecting roller is rotated by rotating the detecting lever around the first rotating shaft. Is moved in the direction of contact with and away from the reference roller, and the detection lever is rotated around the second rotation axis to move the detection roller along the axial direction of the reference roller. The paper sheet thickness detection device according to claim 1. 2. The paper sheet thickness detection device according to claim 1, wherein the attachment means includes a ball joint, and the detection lever is attached via the ball joint. The paper sheet thickness detection device according to claim 1, wherein the attachment means includes an elastic body, and the detection lever is attached via the elastic body. A reference roller;
A detection roller that is provided opposite to the reference roller and allows paper sheets to pass between the reference roller;
A detection lever for attaching the detection roller to one end side;
A contact roller that is located upstream of the detection roller of the detection lever in the paper sheet conveyance direction and is opposed to the reference roller, and makes the conveyed paper sheet contact and pass therethrough. When,
Mounting means for movably attaching the other end side of the detection lever so that the detection roller and the contact roller move in a direction of coming into contact with and separating from the reference roller;
Pressing means for elastically pressing the detection roller;
Detection means for detecting the thickness of the paper sheet based on a displacement amount of the detection roller in a direction away from the reference roller when the paper sheet exists between the reference roller and the detection roller; ,
A thickness detection device for paper sheets, comprising: The interval between the detection roller and the contact roller is a timing at which the detection roller displaced in a direction away from the reference roller based on the contact of a sheet with the contact roller returns to the initial position; 6. The paper sheet thickness detection device according to claim 5, wherein the paper sheets are set so that the timing at which the paper sheets reach the detection roller is substantially the same. 6. The paper sheet thickness detection device according to claim 5, wherein the contact roller is made of an elastic body. 6. The paper sheet thickness detection device according to claim 1, wherein a surface layer of the reference roller is harder than a surface layer of the detection roller. The surface layer of the reference roller is made of a wear-resistant material having a hardness of HRc 70 or higher, and the surface layer of the detection roller is made of a wear-resistant material having a hardness of HRc 60. 8. The paper sheet thickness detection device according to 8. 9. The paper sheet thickness detecting device according to claim 8, wherein the surface layer of the reference roller is a cemented carbide or a powdered high-speed layer.

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