JPH05215622A - Frictional force measuring apparatus - Google Patents

Abstract

PURPOSE:To realize highly accurate measurement of frictional force while keeping high efficiency by coupling a board member and a force detector through a coupling means rotatable freely in other direction with high rigidity in the direction of frictional force functioning on the board member. CONSTITUTION:A force detector, i.e., a load cell 22, is coupled through a coupling means, i.e., a coupling part 23, with a board member 21. A paper sheet 32 is interposed between the member 21 and a pick roller 33 made of urethane rubber or natural rubber, for example, and secured to the rear of the member 21. Torque is applied onto the roller 33 through a driving means, i.e., a motor 35, coupled with the roller 33 and a shaft 34 and the value of the torque T is measured through a torque detecting section 36 disposed on the shaft 34. An arithmetic section 41 performs an operation based on the data delivered from the detecting section 36 and delivers frictional force data to a computer 40. The computer 40 records the frictional force data, delivered from the arithmetic section 41 at the instance of starting rotation of an encoder 37, as a maximum static frictional force.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a frictional force measuring device for measuring a frictional force between a paper sheet feeding mechanism of a paper sheet conveying / processing device and a paper sheet.

In recent years, the sheet feeding mechanism of a sheet conveying / processing apparatus used for an automatic teller machine (CD), an automatic teller machine (ATM), a printing apparatus, etc. is generally for feeding. The roller (pick roller) is pressed against the paper sheet with a constant pressing force to rotate, and the paper sheet is moved by the frictional force acting between the pick roller and the paper sheet. Focusing on the paper sheets in contact with the pick roller, the frictional force acting between the paper sheet and the pick roller is F1 (force to move the paper sheet), and the frictional force between the paper sheet and other paper sheets. Assuming that the frictional force acting is F2 (force for holding paper sheets), it is necessary that F1> F2 in order for the paper sheets in contact with the pick roller to move. Therefore, in order to obtain a larger F1 than the frictional force F2, it is necessary to change the material and shape of the pick roller and measure the frictional force F1 acting between the pick roller and the paper sheet.

[0003]

2. Description of the Related Art Conventionally, as an example of paper sheets handled by a paper sheet feeding mechanism of a paper sheet conveying and processing apparatus, banknotes are given as follows.
In addition to new banknotes called government sealed tickets, there are banknotes in circulation (circulation tickets). Since circulation tickets are used by ordinary people, they are in various states such as folds, wrinkles, dirt, curls, and tears. Even for these banknotes, the paper sheet feeding mechanism of the paper sheet conveying and processing device is required to stably feed the paper sheets one by one. Therefore,
It is necessary to measure the frictional force on bills in various states on the pick roller and obtain the optimum setting range of the friction coefficient and pressing force of the pick roller from the measured data.

FIG. 4 is a diagram showing the principle of three conventional friction force measurements.
Indicates. In FIGS. 4 (A) to 4 (C), 1 is a paper sheet and 2 is a pitch.
Crawler material, 3 is a weight. The smell in Figure 4 (A)
Then, the paper sheet 1 is pulled by the drive mechanism 4 in the arrow direction. Drive
A load cell 5 is attached between the mechanism 4 and the paper sheet 1 to attach the paper.
Friction force F acting between the leaf 1 and the pick roller material 2
₁To measure. The weight 3 is W, the paper sheet 1 and the pickro
Coefficient of friction between the roller materials 2₁Then, F₁= Μ
₁・ There is a W relationship.

FIG. 4B shows a frictional force measuring device to which the so-called Euler belt theory is applied. The paper sheet 1 is wound around the cylindrical pick roller 6, and the drive mechanism 4 pulls the paper sheet 1. The frictional force F ₂ acting between the paper sheet 1 and the pick roller 6 is measured by the load cell 5. As in FIG. 4A, the weight 3 is W, the paper sheet 1 and the pick roller 6 are
F ₂ = W · exp (μ ₂ ·, where μ _{2 is} the friction coefficient between the _two and the angle at which the paper sheet 1 is in contact with the pick roller is θ.
θ).

In FIG. 4C, two sheets 1 and 1 are placed on a table 7, pressurized by a weight 3 and pulled by a drive mechanism 4 in the direction of an arrow, and a load cell 5 is used to move the sheet shown in FIG. A)
Similarly, the frictional force between the paper sheets 1 and 1 is measured. In this case, assuming that the mass of the weight 3 is W and the coefficient of friction between the paper sheets 1 and 1 is μ ₃ , the frictional force F is the same as in FIG. 4A.
₃ has a relationship of F ₃ = μ ₃ · W.

In the above three relational expressions, the mass W of the weight 3 and the angle θ are known because they are set values, and F ₁
Since ~ F ₃ is obtained by measurement, the friction coefficient μ ₁ ~ μ
₃ is required.

However, the friction measurement shown in FIG.
Is connected to the drive mechanism 4 for measurement, the attachment and detachment of the paper sheet 1 to and from the device is complicated and time-consuming. Therefore, there is a problem that it is difficult to efficiently perform many measurements on various paper sheets.

Therefore, conventionally, a method for efficiently measuring the frictional force has been considered.

FIG. 5 shows a block diagram for performing the efficient measurement of FIG. FIG. 5 shows the peripheral portion of the load cell of the frictional force measuring device. In FIG. 5 (A), the engaging portion 12 is provided at the tip of the load cell 11, and the mounting hole 1
3a and 13b are formed. The load cell 11 measures only the uniaxial force of the arrow A.

On the other hand, mounting holes 15a and 15b are formed in the plate member 14 for facilitating the mounting and removal of paper sheets, and hooks are formed at both ends between the mounting holes 13a and 15a and 13b and 15b. Connected parts (eg wire)
It is not fixed by 16a and 16b, but is connected in a hooked state. A weight 17 for pressurization is provided on the plate member 14. A pick roller 18 is provided below the plate member 14.
Are positioned (see FIGS. 5B and 5C).

In measuring the frictional force at this time, the plate member 14 is pulled by the pick roller 18 in the direction away from the load cell 11 (arrow B), and the plate member 14 and the connecting component 16 are pulled.
Tension acts between a and 16b and the load cell 11, and the load cell 11 is also pulled in the direction of arrow B to measure the frictional force.

Therefore, as shown in FIG.
The case where the frictional force acting between the paper and the paper sheet 19 is measured is shown.
In FIG. 5B, the paper sheet 19 is positioned between the plate member 14 and the pick roller 18, and the paper sheet 19 is fixed to the plate member 14. In this state, rotate the pick roller 18 (arrow C
When a (direction) torque is applied, the paper sheet 19 is pulled in the direction of arrow B by the frictional force, and the force is measured by the load cell 11 to obtain the frictional force.

Further, FIG. 5C shows a case where the frictional force between the sheets is measured, and the sheet 19 fixed to the plate member 14 is shown.
Another sheet 19b is positioned between a and the pick roller 18. When the pick roller 18 is rotated in the direction of arrow C in this state, the plate member 14 is pulled in the direction of arrow B by the frictional force between the paper sheets 19a and 19b, and the force is measured by the load cell 11 to obtain the frictional force. Is.

[0015]

By the way, the connection between the load cell 11 and the plate member 14 is made by connecting parts 16 respectively.
Since a and 16b are connected in a hooked state, the plate member 14 jumps up or vibrates on the pick roller 18 as the pick roller 18 rotates at high speed. in this case,
Since the plate member 14 is not restrained by the connecting parts 16a and 16b, the phenomenon of tension and relaxation is repeated during measurement of the load cell 11.

For this reason, the output of the load cell 11 becomes oscillating, which causes an error in the measurement of the frictional force. Although it is conceivable to fix the connecting parts 16a, 16b to the plate member 14 and the engaging portion 12 of the load cell 11, there is a problem in that the replacement of paper sheets becomes complicated and efficient measurement becomes difficult.

Therefore, the present invention has been made in view of the above problems, and an object of the present invention is to provide a frictional force measuring device capable of maintaining an efficient measurement and performing a highly accurate frictional force measurement.

[0018]

FIG. 1 is a block diagram showing the principle of the present invention. In FIG. 1, a frictional force measuring device for measuring a frictional force generated between a paper sheet fed out from a roller and another member including another paper sheet, 21 is a plate member, and is a roller. The fed paper sheets are sandwiched by the rollers. A force detector 22 detects the force acting on the plate member 21 by the fed paper sheets.
Further, 23 is a connecting means having a high rigidity in the direction of the force (arrow D) acting on the plate member 21, and connects the plate member 21 and the force detector 22.

In this case, the connecting means 23 has, for example, a joint portion 25 which is rotatable left and right and up and down between the two support rod members 24a and 24b.

[0020]

As shown in FIG. 1, the connecting means 23 has a structure in which a joint 25 is interposed between two supporting rod members 24a and 24b. The joint portion 25 is rotatable left and right and up and down, and is rotatable about X, Y, and Z axes. Therefore, the plate member 21
The support rod members 24a and 24b and the joint portion 25 have high rigidity in the direction of arrow D acting on the arrow D, and low rigidity in the other directions.

As a result, the force detected by the force detector 22 does not relax even if the roller for feeding out the paper sheets rotates at high speed and the plate member 21 jumps up or vibrates, and the output of the force detector 22 does not relax. It is possible to reduce the fluctuation of 1 to less than the conventional example.

Further, since the rigidity is low in the directions other than the direction of the arrow D acting on the plate member 21, it is possible to maintain efficient measurement without complication when exchanging the paper sheets.

[0023]

FIG. 2 shows a block diagram of an embodiment of the present invention.
In the frictional force measuring device 31 of FIG. 2, the load cell 22 which is a force detector is connected to the plate member 21 by a connecting part 23 which is a connecting means (described later).

The paper sheet 32 is positioned between the pick roller 33 formed of urethane rubber, natural rubber or the like and the plate member 21, and fixed to the back surface of the plate member 21. A torque T is applied to the pick roller 33 by a motor 35, which is a driving means, by connecting the pick roller 33 and the shaft 34, and the value of the torque T is measured by a torque detector 36 on the shaft 34. An encoder 37, which is a rotation detector, measures the rotation status of the pick roller 33 (whether it is stopped or rotating, and the number of rotations when rotating), and outputs a signal to the computer 40.

Reference numeral 38 is an encoder for controlling the motor,
The rotation value from the encoder 38 is input to the motor control unit 39, and the motor 35 is controlled by a command from a computer 40 that controls the entire device.

Reference numeral 41 denotes a calculation unit, which performs calculation based on the data from the torque detection unit 36 and outputs friction force data to the computer 40. The calculation is performed based on the relational expression of Fa = T / R, where R is the radius of the pick roller 33 and Fa is the force acting at the contact portion between the pick roller 33 and the paper sheet 32.

Reference numeral 42 denotes a load cell amplifier, which amplifies the output of the load cell 22 and outputs it as force data to the computer 4
Output to 0.

A weight 43 (see FIG. 3) is placed on the plate member 21. Further, 44 is a guide for preventing the paper sheets from falling down, and 45 is a stopper for stopping the paper sheets 32 in the traveling direction.

FIG. 3 is a block diagram of the connecting part shown in FIG. A support rod member (rod) 24 a of the connecting component 23, which is threaded, is fixed to a tip portion 51 of the load cell 22 by a nut 52.

On the other hand, a weight 43 is placed on the plate member 21 located on the pick roller 33, and a T-shaped mounting portion 24b ₁ formed at one end of the support rod member (rod) 24b. It is fixed with screws. A paper sheet 32 is fixed to the back surface of the plate member 21.

A spherical bearing 25, which is a joint, is interposed between the support rods 24a and 24b. The spherical bearing 25 is rotatable about X, Y, Z (upper, lower, left, and right) axes, and therefore has high rigidity in the direction of the force (friction force) acting on the plate member 21 and low rigidity in the other directions.

Further, the distance between the load cell 22 and the plate member 21 can be adjusted by a nut 52 as a position adjusting means, and after the adjustment, the position is fixed by, for example, a double nut system.

First, the frictional force measuring device 31 as described above will be described.
The computer 40 controls the motor 3 to the motor 3
Command 5 to generate torque. Motor control unit 3
Reference numeral 9 controls the current to the motor 35 to gradually increase the torque of the motor 35.

The computer 40 reads and records the frictional force data from the calculation unit 41 calculated based on the rotational torque from the torque detection unit 36. At the same time, a signal from the encoder 37 is read to monitor whether the pick roller 33 has stopped or started rotating.

Then, the computer 40 records the frictional force data from the arithmetic unit 41 at the moment when the encoder 37 starts rotating as the maximum static frictional force. Further, the frictional force data during the rotation of the encoder is recorded as a dynamic frictional force.

In this case, as shown in FIG. 3, the connecting component 23 has a high rigidity in the direction of the force (friction force) acting on the paper sheet 32 and the plate member 21 delivered by the pick roller 33, and the plate member is high. 21 and the load cell 22 are in a fixed state. Therefore, the rotation of the pick roller 33 increases, and even if the plate member 21 bounces or vibrates due to the shape error of the pick roller 33, the force acting on the plate member 21 is accurately transmitted to the load cell 22. In this case, even when the plate member 21 returns to the load cell 22 side, it is possible to measure the change in frictional force according to the degree of return.

Further, since the spherical bearing 25 is rotatable about the X, Y, and Z axes, the paper sheets 32 can be easily replaced and efficient measurement can be maintained. ..

As described above, the frictional force acting between the pick roller 33 and the paper sheet 32 can be measured under the same conditions as the actual machine while maintaining the efficient measurement, and the practical data can be obtained. Obtainable.

In the above embodiment, the paper sheet 32 is fixed to the back surface of the plate member 21, the pick roller 33 is rotated, and the frictional force acting between the pick roller 33 and the paper sheet 32 is applied. Although the case of measurement is shown, as shown in FIG. 5 (C), when another sheet is positioned between the sheet 32 and the pick roller 33 and fed out, the action between the sheets is exerted. The frictional force can be measured.

[0040]

As described above, according to the present invention, the plate member and the force detector are connected by the connecting means which has high rigidity in the direction of the frictional force acting on the plate member and is rotatable in the other direction. By connecting, efficient measurement can be maintained and highly accurate friction force measurement can be performed, and practical data can be obtained.

[Brief description of drawings]

FIG. 1 is a principle configuration diagram of the present invention.

FIG. 2 is a configuration diagram of an embodiment of the present invention.

FIG. 3 is a configuration diagram of the connecting component of FIG.

FIG. 4 is a principle diagram of conventional frictional force measurement.

5 is a configuration diagram for performing the efficient measurement of FIG.

[Explanation of symbols]

 21 plate member 22 force detector 23 connecting means 24a, 24b support rod member 25 joint part 31 friction force measuring device 32 paper sheet

Claims (3)

[Claims] 1. A friction force measuring device for measuring a friction force generated between a paper sheet (32) delivered from a roller (33) and another member including another paper sheet, wherein the roller (33) Paper sheets fed out in (32)
(21) for sandwiching the roller with the roller (33)
And the plate member (21) by the fed paper sheets (32)
A detector (22) for detecting a force acting on the plate member, the plate member (21) and the force detector (22) are connected to each other,
A frictional force measuring device comprising: a connecting means (23) having high rigidity in a direction of a force acting on the plate member (21). 2. The connecting means (23) is characterized in that a joint part (25) rotatable between left and right and up and down is interposed between two support rod members (24a, 24b). The frictional force measuring device described. 3. A position adjusting means (52) for adjusting a distance between the plate member (21) and the force detector (22) connected by the connecting means (23) is provided. The frictional force measuring device according to 1 or 2.