JPS60201247A - Material sensor - Google Patents

Abstract

PURPOSE:To minimize the influence of hunting of an object which arises during movement at a high speed and to detect surely the object by controlling the moving width of the object passing between the two detecting coils to be electromagnetically induced by excitation coils by means of control members. CONSTITUTION:A material sensor 20 for an object (coin) has a U-shape and an excitation coil WE to be excited by an excitation signal is wound on a projection 21; at the same time a coil WA on an electromagnetically induced secondary side is wound thereon. A similar secondary coil WB is wound on a projection 22. The secondary coils WA and WB are wound at the same number of turns and in the directions opposite from each other. An object C passes through a recess 23 formed between both projections 21 and 22. Control members 31, 32 consisting of ceramics or bakelite are provided atop the projection 21 to x1 thickness and on the bottom surface of the projection 22 to x2 thickness in order to control the moving width of the object C. The hunting distance during hunting of the object which arises in the stage of conveying the same at a high speed is controlled by the provision of such control members, by which the exact detection of the object is made possible.

Description

[Detailed Description of the Invention] (Technical Field of the Invention) The present invention relates to a material sensor for an object, and particularly to a sensor for detecting the material of a coin moving at high speed in a passageway in a coin processing machine such as a coin counting machine or a coin wrapping machine. Regarding material sensors for

(Technical background of the invention and its problems) Various types of material sensors have been considered and put into practical use to detect the material of an object, such as a coin. The material of the coin is detected, but the speed of the coin passing through the coin sorting section is relatively slow, and the coin is moved while firmly contacting the regulating surface, so the output from the material sensor is stable. There are no particular problems. However, coin processing machines such as coin counters and coin wrapping machines process coins at high speeds, and until recently, material sensors have not been used to sort coins. This is because such coin processing machines are often used in financial institutions such as banks, and it was thought that counterfeit coins would not normally be brought into financial institutions.

However, due to the recent popularity of TV games, some of the coins brought in from game centers etc. are counterfeit coins (for example, coins that have the same diameter as genuine coins but have a different thickness and material; for example, 50 yen coins wrapped with solder and soldered to 100 yen coins). Coin processing machines are also being equipped with material sensors to detect counterfeit coins. However, after the 500 yen coin was issued, it became clear that there was a foreign coin that was extremely similar to the 500 yen coin (for example, the South Korean 500 won coin).
It is exactly the same as a yen coin, only the thickness is slightly different, about 0.
．． It is made only 2mm thick. If this difference in thickness, that is, the difference in the distance between the sensor and the coin surface, is always maintained correctly, it would be possible to distinguish between the two by increasing the sensitivity of the conventional material sensor, but the coin processing as described above The machine's throughput per unit time is extremely high, approximately 1,500 coins or more per minute, and the coins move at high speed through the coin passage, so even if the coins are held down and conveyed from above onto the passage surface by a conveyor belt. However, coins often dance slightly upwards from the aisle surface, so no matter how much you increase the sensitivity of the material sensor, the output is often the same, making it impossible to reliably distinguish genuine coins from counterfeit coins. Met.

(Object of the invention) This invention was made under the above circumstances,
The purpose is to provide a material sensor that is optimal for coin processing machines that process coins in large quantities and at high speed.

(Summary of the Invention) The present invention relates to a material sensor, which includes a primary coil excited by an excitation signal, two differentially wound secondary coils electromagnetically induced by the primary coil,
It consists of a regulating member (for example, ceramic, Bakelite) that regulates the movement width of an object (for example, a coin) that passes between these two secondary coils, and the material of the object is detected by the output of the secondary coil. It is.

(Embodiment of the Invention) Fig. 1 is a mechanical diagram showing an example of a coin processing machine equipped with a material center 20 of the present invention, in which a rotary disk 1 for sending out coins releases coins into the interior by its rotation. A large number of coins C are sequentially arranged around the periphery by centrifugal force, and the arranged coins C are sent out to a coin passage 2 outside the rotary disk l. The coin C is sorted and transferred according to its outer diameter.

It is composed of a fixed member 3 and a movable member 4 arranged in parallel. Shoulder portions 3A and 4A are formed over the entire length of the fixed member 3 and the movable member 4 on opposing sides, respectively.
It is designed to move on A. Therefore, coins having a smaller diameter than the opposing distance between the shoulders 3A and 4A will fall from above the coin passage 2. Further, the movable member 4 is arranged so that the distance from the fixed member 3 can be changed, and is always subjected to force in the enlarged direction, that is, to the right in the figure, by a spring 5.5. Furthermore, the movable member 4 has a contact portion 6 made of a roller.
is provided, and this contact portion 6 is in contact with the circumferential surface of a cam 7 for setting the passage width, and the cam 7 is moved from the cam surface 71 that sets the passage width corresponding to the largest diameter coin. Cam surface 72 that sets the passage width to accommodate small diameter coins.・・・
- The cam surfaces 71 to 76 are arranged in the order of 76, and each of these cam surfaces 71 to 76 is formed into a circular arc surface centered on the axis of the cam shaft 8. A setting dial 1o on which a setting denomination 9 is displayed is attached to the camshaft 8.

On the other hand, the conveyance device 11 is composed of pulleys 12 and 13 arranged at both ends of the coin passage in the length direction, and a bell H4 mounted on these pulleys 12 and 13, and includes a drive mechanism such as a motor. (not shown) rotates the pulleys 12 and 13 in the direction of the arrow shown in the figure, and by driving the bell N4 in the same direction, the coin C on the coin passage 2 is conveyed to the front side in the figure. A material sensor 20, which will be described later, is provided on the 4" 4 catfish 9 Ichibebe tube in J-1, and a counting sensor 1B consisting of a photoelectric switch or a proximity switch is further disposed on the front side. C is counting sensor 1
The number of coins is counted based on the signal obtained when the position 6 is reached. Further, a coin passage blocking device (not shown) is provided between the material sensor 20 and the counting sensor 16, and when activated, a blocking rod connected to a solenoid protrudes into the coin passage 2 to prevent the coin C from being conveyed. It is designed to prevent it. The activation timing of the blocking rod is when the number of sheets to be counted reaches the set value when the number of sheets to be counted is set separately in advance.
Or when a counterfeit coin is detected by the material sensor 20.

Next, the material sensor 20 of the present invention is shown in FIGS.
To explain B), the material sensor 20 has a U-shape, and the coin C is conveyed through a recess 23 formed between both protrusions 21 and 22.
The protrusion 21 has an excitation coil W excited by an excitation signal.
At the same time as E is wound, a secondary coil MA that is electromagnetically induced is also wound, a similar secondary coil WB is wound around the protrusion 22, and the secondary coils-A and WB are wound. The number of windings is the same, but the winding directions are opposite to each other, and the output VD between the output terminal T2 of the secondary winding MA and the output terminal T1 of the secondary winding MA with respect to the common connection point TO is differential. It is now output to the type. If the thickness of the coin C is t and the distance between the protrusions 21 and 22 is d, then the coin C will always be conveyed in contact with the top surface of the protrusion 21 as shown in FIG. 2(A). If so, the output VD will always be at a predetermined output signal level depending on the material of the coin C. However, in the coin processing machine as described above, since the coin C is conveyed at a high speed, the coin C is conveyed in a dancing state at a distance X from the top surface of the protrusion 21, as shown in FIG. 2(B). It turns out. As a result of experimenting to determine the output between terminal TC and terminals TI and T2 with respect to the dancing distance X during the transportation of coin C, a characteristic curve as shown in Fig. 3 was obtained. That is, the output VA of the secondary winding QA has a signal level as indicated by the Δ mark in FIG. 3, and the output v8 of the secondary winding wB has a curve as indicated by the X mark in the figure. As a result, the differential output VD(-
VA-VB) becomes a curve like the 0 mark in FIG. As is clear from this experimental result, the signal level of the differential output VD is the moving distance #! is approximately 0, and the rate of change is approximately 1% in the range AR of Euam ~ 2.5 mm, and it is sufficient to keep the moving distance #X of the coin C during transportation within this range AH. I understand. Therefore, in the present invention, as shown in FIG. 4, a regulating member 31 made of ceramic or Bakelite having a thickness of 1 is layered on the upper surface of the projection 21, and a regulating member 31 made of ceramic or Bakelite having a thickness of 1 is layered on the lower surface of the projection 22. The distance that the coin C moves from the upper surface of the protrusion 21, that is, the secondary winding WA! The range of about 0.5 layer 11~2
．． The range should be up to 5mm. Therefore, in this example, the thickness xl of the regulating member 31 is approximately 0.5 mm, and the thickness weight 2 of the regulating member 32 is obtained by subtracting the thickness t of the coin C from the distance d between the protrusions 21 and 22, and subtracting the thickness t of the coin C from the value. .5mm
The value obtained by subtracting , that is, 萱9 rei d-+-u
Sum 11! 1 ☆ Doubt 1111 □ 16F's 9 Basket Small If you set it to Total, the range in which coin C can move will always be within protrusion 2.
The range is from 0.5 an to 2.5 am from the top surface of 1.

In this way, by regulating the interval at which the coin C passes through the differential material sensor 2o using the regulating members 31 and 32 and by reducing the level of change in the differential output VD, the material of the coin C can be determined stably and accurately. It becomes possible to detect.

In addition, although the regulating members 31 and 32 are provided in the first description,
The sensor body may be integrally molded with Bakelite or ceramic.

FIG. 5 shows a comparison of the levels of the differential output VD for various coins, including a 1 yen coin, a 10 yen coin, a 5 yen coin, a 500 yen coin, and a 100 yen coin.

The level of the differential output VD decreases in the order of the 50 yen coin, and the difference between the 500 yen coin and the Korean 500 won is extremely small, but the distance traveled by coin C! Even if this occurs, the change in signal level is small, so it is possible to reliably identify the material.

By converting the level ranges of 6Mσunnato and 6Mσunnato into digital values and storing them in memory, a differential signal V that responds to the material of the coin can be generated.
By comparing with D, the denomination of the coin can be identified.

FIG. 6 shows in block form the circuit configuration for identifying coins, and shows the differential output VD obtained by the material sensor 20.
is inputted into the comparison circuit 41 and compared with the level values of various coins registered in advance in the memory 40 to output a denomination signal MO based on the material. (separately detected by rotation position of 10) D
T is sent to the denomination discrimination circuit 42, and when it completely matches the denomination signal sum from the comparison circuit 31, the final denomination signal FD is obtained.
By outputting , it becomes possible to identify coins with high accuracy.

(Coin of the Invention) As described above, according to the material sensor of the present invention, even if an object (coin) dances while moving at high speed, the effect can be reduced, and in particular, it can be This makes it possible to reliably detect counterfeit coins.

[Brief explanation of the drawing]

FIG. 1 is a mechanical diagram showing an example of a coin processing machine to which the present invention is applied, FIGS. 2(A) and (B) are diagrams for explaining the operation of the material sensor of the present invention, and FIG. 3 is a diagram of the present invention. Fig. 4 is a diagram showing an example of the structure of the material sensor of the present invention, and Fig. 5 is a comparison of signals obtained by the material sensor of the present invention for each denomination. FIG. 6 is a circuit diagram of a coin identification device using the present invention. DESCRIPTION OF SYMBOLS 1... Rotating disk, 2... Coin path, 3... Fixed member, 4... Movable member, 5... Spring, 7... Cam, 1
1... Conveyance device, 20... Material sensor, 21.22
...Protrusion, 31.32...Regulation member, C...Coin. 2nd (A) fE Figure 2 (B) Figure 3 IWIII

Claims (3)

[Claims] (1) A primary coil that is excited by an excitation signal, two differentially wound secondary coils that are electromagnetically induced by this primary coil, and an object that passes between these two secondary coils. and a regulating member that regulates a movement width of the object, and detects the material of the object based on the output of the secondary coil. (2) Use ceramic or Bakelite as the regulating member! The material sensor according to claim 1, comprising: (3) The material sensor according to claim 1 or 2, wherein the object is a coin.