JPH05116064A - Coin polishing apparatus - Google Patents

Abstract

PURPOSE:To improve the polishing efficiency of a coin polishing apparatus and to reduce the size of the apparatus. CONSTITUTION:A truncated conical shape separation cylinder 3 having many through holes for passing an abrasive material bored therein is laid down to be freely rotated in the circumferential direction, and a coin polishing drum 2, the diameter of which is gradually reduced from the vicinity of the central portion to both end sides, is disposed in the separation cylinder 3 in such a manner as to be freely rotated concentrically. Coins and an abrasive material are put in the coin polishing drum 2, and scooping-up and dropping are repeated by the rotation of the drum to make the coins and the abrasive material come into contact with each other violently, whereby stains adhering to the coin surface is removed by polishing. Then, the coins and the abrasive material which overflow from the coin polishing drum 2 are separated from each other in the separation cylinder 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coin polishing device for removing dirt adhering to the surface of coins used in game machines and coins used as coins.

[0002]

2. Description of the Related Art As a method for removing dirt adhering to the surface of a coin, there is a method of mixing the coin with a granular abrasive and removing the dirt on the surface of the coin by the polishing action of the abrasive. Conventionally, this type of polishing device has been used as an actual flat blade 2-19461.
There is one described in the official gazette. This device supplies coins and abrasives to the lower part of a vertical polishing cylinder set up in the vertical direction, rotates a screw provided in the polishing cylinder to lift while stirring, and while bringing the abrasives and coins into contact with each other. Perform polishing. Then, the coin and the abrasive material overflowing from the upper part of the polishing cylinder are sent to an abrasive material separating device provided on the side portion to separate the abrasive material and the coin.

[0003]

However, in the method of polishing coins while lifting the coins in the vertical polishing cylinder with the screw as in the above-mentioned device, the stirring action is weak and the coins are overlapped with each other, or the abrasive is put on the coins. In some cases, it may move upward while maintaining the state, and polishing efficiency cannot be expected so much.

In view of the above points, it is an object of the present invention to provide a coin polishing device which improves the polishing efficiency and has a compact device.

[0005]

In order to achieve the above object, the present invention provides a coin polishing apparatus for polishing a surface of a coin by mixing a granular abrasive and a coin, and opening one end of the coin polishing apparatus. A frusto-conical separation cylinder whose end is closed is laid free to rotate in the circumferential direction, and a large number of through holes are formed in the peripheral wall of the separation cylinder to allow the polishing material to pass therethrough. A weir plate for stopping the flow of abrasives of appropriate height is provided along the coin, and a coin discharge chute is provided at the lower end on the opening side, while the diameter of the coin is gradually reduced from the central part toward both ends. A polishing drum is inserted concentrically into the separation cylinder so as to be rotatable in the circumferential direction, and an abrasive feed hopper for supplying an abrasive to one end of the coin polishing drum and a coin throw for inserting a coin A chute is installed and drops below the separating cylinder. With arranging the abrasive receiving hopper for receiving the abrasive material that is obtained by connecting the abrasive circulation pipe between the receiving abrasive hopper the abrasive supply hopper.

[0006]

According to the present invention, when the coin and the abrasive material are put into the polishing drum, the abrasive material and the coin are scraped upward or fall with the rotation of the polishing drum and come into contact violently. The surface is polished with an abrasive to remove dirt. Since this polishing drum has a bulged central part, when the coin and abrasive material are scraped up and fall and disperse, they act to gather together in the central part, so they come into close contact with each other and have a high polishing effect. Exert.

Then, when the coin and the abrasive are successively fed, they overflow from the other end of the polishing drum and fall into a separating cylinder arranged outside the polishing drum. Then, the coin and the abrasive material are lifted as the separation cylinder rotates, and the abrasive material is dropped from the through hole of the separation cylinder while repeating the drop to separate them. On the inner peripheral part of this separation cylinder, a weir plate for preventing the abrasive material from flowing is arranged to prevent the advance of the coin and the abrasive material, and the staying time in the separation cylinder is lengthened to further improve the separation efficiency. .. The separated abrasive is circulated through the abrasive circulating pipe and reused.

[0008]

Embodiments of the present invention will be described below with reference to the drawings.

Reference numeral 1 denotes a coin polishing device for polishing a coin, the main body of which is a polishing drum 2 for polishing a coin by mixing with a polishing material, and a separating cylinder 3 for separating the polishing material and the coin.
Has become.

The separating cylinder 3 is formed in a frusto-conical shape by a steel plate having a large number of through holes for allowing a granular abrasive material to pass therethrough or a wire mesh having openings, and is laid inside the machine frame 4. It is arranged in a closed state, and an opening on one side thereof is closed by a closing plate 5. Then, the polishing drum 2 whose diameter is gradually reduced from the vicinity of the central portion toward both ends is inserted into the separation cylinder 3 through the opening on the other side of the separation cylinder 3 and arranged concentrically. A rotary shaft 6 is provided substantially horizontally in the polishing drum 2.
And the fixing bush 7 fitted to the rotary shaft 6 and the polishing drum 2 are fixed to each other by the fixing material 8, and the rotary shaft 6 is passed through the closing plate 5 of the separation cylinder 3 and both ends thereof are The polishing drum 2 is rotatably supported by bearings 9 mounted on both sides of the machine frame 4.

A rotating bush 10 is fixed to a portion of the closing plate 5 of the separating cylinder 3 which penetrates the rotating shaft 6 and is attached to the rotating shaft 6 via a bearing 11 so that the separating cylinder 3 can rotate around the rotating shaft 6. There is. Then, the sprockets 12 and 13 are fixed to the ends of the rotating bush 10 and the rotating shaft 6, and the sprockets 12 and 13 are connected to the sprockets 15 and 16 of the electric motor 14 attached to the machine frame 2 via the chains 17 and 18, The separating cylinder 3 and the polishing drum 2 are driven by the electric motor 14.
I am trying to rotate.

Reference numeral 19 is a conical cone for guiding the material to be put into the polishing drum 2. One end is attached to the outer frame of the bearing 9 attached to the machine frame 4, and the other end is inserted into the polishing drum 2. At the same time, it is fixed to a rotating bush 21 attached to the rotating shaft 6 via a bearing 20. Reference numeral 22 is a hopper for supplying an abrasive, which stores a predetermined amount of abrasive,
The discharge chute is connected to the conical cone 19, and the rotary valve 23 dispenses a predetermined amount of abrasive material and puts it into the polishing drum 2. 24 is a drum for polishing coins 2
It is a coin insertion chute to be inserted inside.

Reference numeral 25 denotes a feed blade spirally attached to the inner wall of the polishing drum 2 for feeding the material put into the polishing drum 2 forward.

Further, a weir plate 26 for blocking the flow of abrasives is installed upright at the inner peripheral portion of the separating cylinder 3 in order to prevent the flow of the abrasives and recover the abrasives. The coins that flow over the weir plate 26 for preventing the abrasive material from flowing down are discharged from the coin discharging chute 27. An abrasive receiving hopper 28 for receiving the abrasive spilled from a through hole formed in the separating cylinder 3 is disposed below the separating cylinder 3.

An abrasive material circulation pipe 29 is connected to the lower portion of the abrasive material receiving hopper 28, and the tip portion thereof is connected to the abrasive material supply hopper 22 and a suction pump (not shown).
Thus, the abrasive is circulated through the abrasive circulating pipe 29 and sucked into the abrasive supplying hopper 22 for circulation.

However, when polishing a coin, the electric motor 14 is driven to rotate the polishing drum 2 and the separation cylinder 3 at a predetermined speed. Then, the rotary valve 23 of the abrasive material supply hopper 22 is rotated to start supplying the abrasive material into the polishing drum 2 in an appropriate amount, and at the same time, the coin is inserted into the polishing drum 2 from the coin insertion chute 24. The coin and the abrasive come into contact with each other while being repeatedly scraped up and dropped in the polishing drum 2, and dirt adhering to the surface of the coin is polished and removed by the abrasive. At this time, since the polishing drum 2 has a shape in which the central portion is swollen, the coins and the polishing material scraped up by the rotation of the drum try to disperse once at the upper part, but at the time of dropping, they are moved to the central portion again. Since they are collected, the degree of contact between the coin and the abrasive is increased, and the polishing effect is further exerted.

When coins are successively inserted into the polishing drum 2, the coins are spilled from the discharge side due to the feeding action of the feed blades 25 in the drum and the overflow caused by continuous feeding. The abrasive and the coins spilled from the polishing drum 2 fall on the separating cylinder 3 arranged on the outer peripheral portion. While the scraping and dropping are repeated by the rotation of the separating cylinder 3, the abrasive passes through the through hole formed in the peripheral wall and is collected by the lower abrasive receiving hopper 28. At this time, the abrasive which has not fallen well falls from the through hole while the forward movement of the abrasive flow blocking dam plate 26 is blocked. Further, the coin passes over the weir plate 26 for preventing the abrasive from flowing down, and the coin discharge chute 27
Is discharged from and collected.

The polishing material collected in the polishing material receiving hopper 28 is supplied to the polishing material circulating pipe 2 by a suction pump (not shown).
It collects through 9 to the abrasive material supply hopper 22, and is recycled.

[0019]

As described above, according to the present invention,
A frustoconical separating cylinder 3 having a large number of through holes formed in its peripheral wall for allowing abrasives to pass therethrough is rotatably laid therein, and the diameter of the coin polishing drum is gradually reduced from the vicinity of the central portion toward both ends. Since 2 is inserted concentrically, the size can be made smaller than the conventional polishing apparatus.

Further, the coin polishing drum 2 has a shape in which the diameter is gradually reduced from the vicinity of the central portion toward both ends,
Since the structure in which the coin and the abrasive are violently contacted by repeatedly scraping and dropping by rotating the drum, the polishing efficiency can be improved as compared with the conventional polishing apparatus.

[Brief description of drawings]

FIG. 1 is a partially cutaway schematic front view of the present invention.

FIG. 2 is a sectional view taken along line AA of the above.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Coin polishing device 2 ... Polishing drum 3 ... Separation cylinder 22 ... Abrasive material supply hopper 24 ... Coin input chute 27 ... Coin discharge chute 26 ... Abrasive material flow prevention dam plate 28 ... Abrasive material receiving hopper 29 ... Abrasive material Circulation piping

Claims (1)

[Claims] 1. A coin polishing apparatus for polishing a surface of a coin by mixing a granular abrasive and a coin, and laying a frustoconical separation cylinder having one end open and the other end closed. It is rotatable in the circumferential direction, and a large number of through holes are formed in the peripheral wall of the separation cylinder to allow the abrasive to pass through, and a weir plate for preventing the abrasive material from flowing down along the inner circumference of the separation cylinder. Then, while arranging a coin ejection chute at the lower end on the opening side,
A coin polishing drum having a diameter gradually reduced from the vicinity of the central portion toward both ends is inserted concentrically into the separation cylinder so as to be rotatable in the circumferential direction, and an abrasive material is provided at one end of the coin polishing drum. Is provided with a hopper for supplying abrasives and a coin throw chute for inserting coins, and further, an abrasives receiving hopper for receiving the falling abrasives is disposed below the separating cylinder, and the abrasives receiving hopper and the above A coin polishing machine characterized in that a polishing agent circulating pipe is connected to the polishing agent supply hopper.