JP2919253B2 - Medium thickness detection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a medium thickness detecting device for detecting the thickness of a medium such as a paper sheet.

[0002]

2. Description of the Related Art As a medium thickness detecting device for detecting the thickness of a medium such as a paper sheet, there is, for example, a device disclosed in Japanese Patent Application Laid-Open No. 64-9587. This medium thickness detecting device has a position fixing roller having a position fixed, and a position movable roller movable in a position substantially along the radial direction of the position fixing roller, and moves the medium between the position fixing roller and the position movable roller. The thickness of the medium (including the presence or absence of the medium) is detected by detecting the displacement of the position movable roller by the swing angle of the arm that supports the roller. As another medium thickness detecting device similar to this, as shown in FIGS. 2A and 2B , similarly to the above, the position fixing roller 31 for fixing the position is used.
And a position-movable roller 32 that is position-movable along a substantially radial direction of the position-fixing roller 31 as shown by an arrow A,
There is a medium thickness detecting device that detects the thickness of the medium 34 by detecting the displacement of the position movable roller 32 by bringing the sensor 33 into contact with the position movable roller 32. In this case, the sensor 33 includes a rotatable small roller 35 that comes into contact with the position movable roller 32 on the opposite side to the contact portion with the position fixing roller 31, an arm 36 that supports the roller 35, and swinging of the arm 36. And a detection unit 37 having a potentiometer or the like for detecting an angle. When the medium 34 is passed between the position fixing roller 31 and the position movable roller 32 while being pinched, the medium 34
, The position movable roller 32 moves in the direction away from the position fixing roller 31, and the position movable small roller 35 also moves in the same direction as indicated by the arrow B, thereby the arrow C
The swingable arm 36 is swung as shown by. Here, arrows marked on the rollers 31, 32, and 35 indicate the rotation direction at the time of detecting the medium thickness.

[0003]

In the latter medium thickness detecting device, as shown in FIG. 3, some foreign matter (for example, ink when the medium is a printed matter such as a bill) is generated from the medium 34 when the medium is pinched and passed. Adheres to the position movable roller 32 by the pinching force between the position fixing roller 31 and the small roller 35 of the sensor 33 via the position movable roller 32, and the small roller 35 is indicated by an arrow D in FIG. For example, a vibration in the direction occurs, which affects the detection of the thickness of the medium 34 by the sensor 33. Therefore, as shown in FIG.
In addition, the brush 38 and the plate-like felt material 39 can be pressed against the position fixing roller 31 and the position movable roller 32 to remove the foreign matter. However, the foreign matter adhering to the sensor 33 can be removed. Can not. Also,
It is not preferable to remove foreign matter by directly applying the brush 38 or the like to the sensor 33 because of the properties of the sensor.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a medium thickness detecting device which detects displacement by bringing a sensor into contact with a position movable roller and which can prevent foreign substances from a medium from adhering to the sensor. is there.

[0005]

In order to achieve the above object, a medium thickness detecting device according to the present invention comprises a position fixing roller having a fixed position, and a position movable roller which is movable along a substantially radial direction of the position fixing roller. Roller, and passes the medium while being sandwiched between the position fixing roller and the position movable roller, and detects the displacement of the position movable roller with a sensor contacting the position movable roller to reduce the thickness of the medium. To detect,
Of the position the movable roller, the detection roller unit provided in addition to the medium nipped portion between the stationary roller, to the detection roller portion, it becomes in contact with the sensor, the location Allowed
The entire range of the moving roller between the medium and the position fixing roller
The detection roller portion is provided outside the body in the axial direction.
It is characterized in that it comprises Te.

[0006]

[0007]

[0008]

According to the medium thickness detecting device of the present invention , the sensor comprises:
Since the position movable roller is in contact with a detection roller portion provided at a portion other than the medium clamping portion with the position fixing roller, foreign matter may adhere to the position movable roller due to the clamping force between the position fixing roller and the position fixing roller. Also, the foreign matter does not adhere to the sensor. Moreover, the position-fixed roller of the position-movable roller
To the outside in the axial direction from the entire media
Since the detection roller unit is provided, the detection roller unit is
The diameter of the movable roller is the same as that of the medium clamping portion with the fixed position roller.
It is possible to make the position movable roller
The structure is easy.

[0009]

[0010]

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A medium thickness detecting device according to a first embodiment of the present invention will be described below with reference to FIGS. 1 (a) and 1 (b). In the following description, a banknote is described as an example of a medium whose thickness is detected, but the present invention can be applied to various other media. Also, in this case, the medium thickness detecting device is provided in a discriminating unit for discriminating whether or not the banknote is valid in a banknote processing machine or the like which performs depositing and dispensing of a banknote, and when a tape or the like is attached to the banknote. Is to be detected. Further, the arrows in the figure are the same as those described in the related art.

In the figure, reference numeral 1 denotes a fixed position roller, and reference numeral 2 denotes a movable position roller. Position fixing roller 1
A shaft portion 4 whose both sides are fixed and rotatably supported by bearings 3 and extend in the horizontal direction;
And a plurality of disc-shaped roller portions 5 of the same diameter formed coaxially at a predetermined pitch at a predetermined position. Here, the outer peripheral surface of the roller portion 5 is subjected to a polishing process or the like in order to increase accuracy. The shaft portion 4 of the position fixing roller 1 is driven at a predetermined speed by a motor (not shown) or the like.

The movable position roller 2 includes a shaft portion 8 rotatably supported by bearings 7 on both sides so as to be parallel to the shaft portion 4 of the fixed position roller 1, and the roller portion 5 coaxially with the shaft portion 8. And a roller portion 9 having the same diameter and formed in the form of a disk which is spaced apart at the same position. The roller portion 9 contacts the roller portion 5 while maintaining a parallel state with the position fixing roller 1 together with the bearings 7 on both sides. The position fixing roller 1 is movable upward along a substantially radial direction from the position to be moved. Here, the outer peripheral surface of the roller portion 9 is also subjected to a polishing process or the like in order to increase accuracy, and the shaft portion 8 of the position movable roller 2 is also driven at a predetermined speed by a motor or the like (not shown). It has become.

The roller portion 5 of the position fixing roller 1
And the paper money 11 is conveyed by the driving force of the motor while the paper money 11 is pinched between the roller portion 9 of the position movable roller 2 and the roller portion 9 which can come into contact with the bill. I have. Here, the interval between the opposite end faces of the roller portions 9 at both ends is a clamping range for clamping the bill 11. The roller portion 5 of the position fixing roller 1 and the roller portion 9 of the position movable roller 2 which can come into contact with the roller portion 5 are provided with a brush 12 for removing foreign matter such as ink adhered to the outer peripheral surface. .

In the first embodiment, the position movable roller 2
The number of the roller portions 9 is the same as the number of the roller portions 5 of the position fixing roller 1 .
Roller part 13 (roller
And the same diameter as that of the part 9).
The roller 13 on the side has a change in the position of the movable roller 2.
The sensor 14 for detecting the position is in contact. Sand
That is, the range of pinching of the position movable roller 2 with the position fixing roller 1
From the entire circumference (between the opposite end faces of the roller portions 9 at both ends)
The sensor 14 is in contact with the outside in the linear direction. These sensors 14 are provided on the opposite side of the position-movable roller 2 with respect to the position-fixing roller 1, a non-driven small roller 15 provided in parallel with the axis, and one end rotatably supporting the small roller 15. An end has an arm 17 swingably supported by a detection unit 16, and the detection unit 16 has a fixed position, and detects the swing angle of the support side of the arm 17 with a pontension meter or the like. It is supposed to.

The sensor 14 having such a configuration includes the roller portion 5 of the position fixed roller 1 and the roller portion 9 of the position movable roller 2.
When the banknote 11 is passed while being pinched by these between
The position-movable roller 2 moves upward from the position-fixing roller 1 by the thickness of the banknote 11, and the small roller 15 that contacts the position-movable roller 2 on the upper side also moves upward by this movement. Swings. And
The thickness of the banknote 11 is detected by detecting the swing angle by the detection unit 16.

As described above, according to the medium thickness detecting apparatus of the first embodiment, the sensor 14 can come into contact with the roller portion 5 of the position fixing roller 1 and move the position where the bill 11 is held between the roller portion 5 and the roller portion 5. The roller 9 is not in contact with the roller 9 of the roller 2, but is in contact with the roller 13 provided outside thereof.
Even if foreign matter such as ink adheres to the roller, the foreign matter does not adhere to the roller unit 13 and therefore does not adhere to the sensor 14. Therefore, in a device in which the sensor 14 is brought into contact with the position movable roller 2 to detect the displacement thereof,
Foreign matter from the bill 11 can be prevented from attaching to the sensor 14.

Further, the roller portion 13 which contacts the sensor 14
Is also coaxial and of the same diameter as the other roller portions 9 and is therefore easy to manufacture. Furthermore, a small roller 15
When foreign matter adheres to the small roller 15, the problem that the small roller 15 partially varies in diameter and the sensor level particularly at the time of the initial state fluctuates is eliminated. And the detection accuracy is also improved.

Here, the foreign substances adhering to the roller portion 5 of the position fixing roller 1 and the roller portion 9 of the position movable roller 2 are as follows.
The brush 12 removes it well. The first
In the embodiment, the roller unit 13 constitutes a detection roller unit, and these roller units 13 may come into contact with the bill 11, but the contact pressure is low, and therefore, foreign matter does not adhere. Here, in order to completely prevent such a contact, the diameter of the roller portion 13 that contacts the sensor 14 may be smaller than the diameters of the other roller portions 9.

[0020]

[0021]

[0022]

[0023]

As described above in detail, according to the medium thickness detecting device of the present invention, the sensor is brought into contact with the detecting roller portion provided at a position other than the portion of the movable position roller which sandwiches the medium with the position fixing roller. Therefore, even if foreign matter may adhere to the position movable roller due to the pinching force between the position fixing roller and
The foreign matter does not adhere to the sensor. Therefore, in the case where the displacement is detected by bringing the sensor into contact with the position movable roller, it is possible to prevent foreign substances from the medium from adhering to the sensor. Moreover, the position fixing roller of the position movable roller
Outside the entire media holding range with the roller in the axial direction
Is provided with a detection roller portion, the detection roller portion,
The position-movable roller has a portion for holding the medium with the position-fixing roller.
It is possible to make them the same diameter, so that the position movable roller
Can be easily manufactured.

[0024]

[0025]

[Brief description of the drawings]

FIG. 1 schematically shows a medium thickness detecting device according to a first embodiment of the present invention, wherein (a) is a front view and (b) is a side view.

FIG. 2 schematically shows a conventional medium thickness detecting device;
(A) is a front view, (b) is a side view.

FIG. 3 is a side view schematically showing a conventional medium thickness detecting device.
This indicates the state of adhesion of foreign matter from the medium.

FIG. 4 is a side view schematically showing a conventional medium thickness detecting device.
And means for removing foreign matter from the medium.
You.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Position fixed roller 2 Position movable roller 11 Banknote (medium) 13 Roller part (detection roller part) 14 Sensor 20 Detection roller part

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-2-49105 (JP, A) JP-A-4-140253 (JP, A) JP-A-3-61243 (JP, A) JP-A-1- 209246 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) G07D 7/00

Claims (1)

(57) [Claims] 1. A position-fixing roller having a position fixed, and a position-movable roller that is position-movable along a substantially radial direction of the position-fixed roller, wherein a medium is moved between the position-fixed roller and the position-movable roller. In a medium thickness detecting device that detects the thickness of the medium by detecting the displacement of the position movable roller with a sensor that contacts the position movable roller while nipping and passing the position movable roller, the position movable roller, the position fixing roller and the a detection roller portion other than the medium clamping portion provided on the sensing roller unit, it becomes in contact with the sensor, the position the movable rollers, the medium sandwiched between the stationary roller
The detection row is located outside the entire holding range in the axial direction.
Medium thickness detector device characterized by comprising providing a La unit.