JP6215378B2 - Medal polishing machine - Google Patents

Description

  The present invention uses a rotating brush to clean and polish the surface of a 1.6 mm thick medal or coin medal used in a gaming machine, and separates and separates dust, dirt, and fine pieces adhering to the surface. The present invention also relates to a medal polishing apparatus that removes these by suctioning them with a negative pressure.

  As a medal polishing device, rotating brushes are placed oppositely above and below the medal transport path, and the elastic resin bristles of each rotating brush are brought into contact with the upper and lower surfaces of the medals, so that the surface of the medals The brush bristle rotation and the elasticity of the bristle rub against the tip of the bristle and rub it off to remove dust, dirt and fine pieces (hereinafter collectively referred to as garbage) from the surface. The medal polishing apparatus for separating and collecting the medals is currently widely used as a medal polishing apparatus in game stores such as pachinko parlors. This prior art is shown in Patent Document 1.

  Furthermore, a technique is also known in which dust, dirt, and fine pieces separated / separated by the rotating brush are sucked by a negative pressure suction device and captured by a filter to be removed. Yes.

  The medal used in the gaming machine has a thickness of about 1.6 mm, and characters / symbols of a store name mark are engraved on the upper and lower surfaces thereof. The coins are also engraved with letters, symbols and figures on the surface.

  The surface of the medal has fine irregularities in the letters, symbols, and figures, and hand sweat and dust adhere to it, making cleaning difficult. This point can be solved by making the overlapping depth (the length of the crossover of the bristle) appropriate for the rotation trajectory of the opposing bristle, and the applicant can obtain a high scratch output and peeling force. It was.

  However, when the rotating brush contacts and rubs against the surface of the metal medals, and when the brush bristles contact and rub against each other, static electricity is generated in the brush bristles and medals. This is because the debris separated or separated by the brush bristles is reattached to the surface of the bristles or medals by static electricity, or the separation is hindered by static electricity and remains attached to the bristles. Therefore, it is difficult to suck and move these garbage due to the negative pressure of the air pressure, making it difficult to suck and collect the garbage, and as a result, it is sent out with the garbage attached to the surface of the medals. There was a problem that polishing was insufficient.

JP 2011-67257 A Japanese Patent Laid-Open No. 11-207016

  The problem to be solved by the present invention is that dust scraped or peeled off by rotating brush hairs is captured by static electricity of brush hairs / medals and remains attached or reattached to brush hairs / medals. Prevents the vacuum brush from being scattered or evacuated to the outer peripheral space of the rotary brush so that it is not sucked by negative pressure suction. The negative pressure suction device reliably captures and eliminates scraped materials that have been scraped and separated by the rotary brush. There is.

The configuration of the present invention that solves this problem is as follows.
1) A pair or a plurality of pairs of opposed rotary brushes that clean the surface of the medals by contacting the top or bottom surface of the medals conveyed along the conveyance path of the medals or coins In addition, medals that are close to each other so that their rotation trajectories overlap each other at a required depth when there are no medals at the tip of the rotating brush and that contact the rotation direction of each rotating brush are sent in the transport direction. In this way, the medal polishing apparatus includes rotating means for rotating in opposite directions and a suction device that sucks dust, dirt, or fine pieces separated and separated from the surface of the medal with a rotating brush under a negative pressure. In
An ion release device that discharges negative ions from the position opposite to the suction port side of the suction device to the opposite side across the transport path is provided along the transport path of medals. A pair of medal guides for restricting medals from being removed from the transport direction in the transporting direction of the opposed rotating brush provided, and there are a plurality of opposing rotating brushes along the transporting path, From the front end toward the front so as to be inserted into the rotation trajectory of the brush bristles of the front rotation brush along the front end perpendicular to the conveyance direction of the conveyance path of the medal guide provided between the pair of opposed rotation brushes A plurality of projecting front projecting portions are provided at a predetermined interval, and projecting rearward from the rear end so as to be inserted into the rotation locus of the bristles of the rear rotating brush along the rear end of the medal guide. A plurality of rear protrusions are provided at a predetermined interval, and the front protrusions and rear protrusions at the front and rear ends of the medal guide come into contact with the brush bristles of the front and rear rotating brushes to scrape dust, dirt, or fine pieces adhering to the brush bristles. The polishing apparatus for medals and the like, characterized in that the brush bristles are vibrated to increase separation / separation of dust / dirt or fine fragments 2) The ion emission device on the ceiling surface of the casing that houses the opposed rotating brushes The medal polishing apparatus according to 1) above, which is provided with a ventilation port for taking in outside air at a position above the anion discharge port of 3). The medal polishing apparatus 4) provided with an air supply fan for sending air 4) The depth δ of the overlapping portion of the rotation locus of the tip of the rotating brush is 2.0 to 5.0 mm, 1) ~ 3) Any 5) The medal polishing apparatus 5) The medal polishing apparatus 6) according to any one of 1) to 4) above, wherein the shape of the front protrusion and the rear protrusion is triangular . One or more pairs of opposed rotating brushes that clean the surface of the medals by contacting the upper surface or the lower surface of the medals being conveyed along the conveying path are arranged in a row, and the tip of the rotating brush When there are no medals, the rotation trajectories are close to each other at the required depth and are rotated in opposite directions so that the medals that contact the rotation direction of each rotary brush are sent in the transport direction. In a medal polishing apparatus comprising rotating means and a suction device that sucks dust, dirt or fine pieces separated or separated from the surface of the medal with a rotating brush under a negative pressure.
An ion release device is provided that discharges negative ions from the position opposite the suction port side of the suction device to the opposite side of the transport path toward the bristles of the rotating brush, and is further downstream in the transport path of medals. A pair of opposed discharge chutes for guiding the discharge direction of medals provided on the delivery side of the opposed rotary brush positioned are provided, and the rotation trajectory of the brush bristle tip of the most downstream rotary brush from the chute front end of the discharge chute A medal polishing device provided with a plurality of chute extending portions in which a part of the front end is extended at a predetermined interval so as to be inserted into the inside. 7) A shadow of the ion emitting device on the ceiling surface of the casing that houses the rotating brushes facing each other. It provided a vent for taking outside air into the upper position of the outlet of ion, the 6) to the rotating brush near the outlet of the anion of the polishing device 8) ion emission device Medals acids according I provided air blower sending air of the atmosphere, the 6) was 2.0~5.0mm the depth δ of the overlapping portion of the rotation trajectory of the tip of the polishing apparatus 9) rotating brush Medals acids according 6) to 8) The medal polishing apparatus according to any one of 10) to 10) From the transporting direction of the transport path of the medals to the sending side position of the rotating brush provided along the transport path of the medals. The medal polishing apparatus according to any one of the above 6) to 9) provided with a pair of medal guides that regulate the disengagement of the medal. 11) There are a plurality of opposing rotating brushes along the conveying path. A forward projecting portion projecting forward from the front end so as to be inserted into the rotation locus of the bristle of the front rotating brush along the front end perpendicular to the transport direction of the transport path of the medal guide provided between the pairs. At predetermined intervals A plurality of rear projecting portions projecting rearward from the rear end so as to be inserted into the rotation trajectory of the bristle of the rear rotating brush along the rear end of the medal guide; The front and rear projections at the front and rear ends of the medal guide come into contact with the brush bristles of the front and rear rotating brushes, scraping off dust, dirt or fine pieces adhering to the brush bristles and applying vibrations to the brush bristles. 10. The medal polishing apparatus according to 10) above, wherein the separation or separation of dirt or fine pieces is enhanced. 12) The shapes of the front protrusion and the rear protrusion are triangular. In the medal polishing machine .

When the rotating brush bristles come into contact with the surface of the medals (usually metal) and the brush bristles rub against the surface of the medals, static electricity is generated, and the dust, dirt, and fine pieces that have peeled off are reattached to the bristles and medals. However, it was difficult to suck these by air suction, and the removal of dust and the like was obstructed.
The present invention has an anion emission device that emits anions toward a rotating brush, and the ions, which are attached to the brush hair by the ionic force of the released anions, are ionized (electrostatic). Neutralization makes it possible to improve the separation of the brush hairs and medals from the surface, thus ensuring the suction and capture of these negative pressures.

Further, even when anions are released toward the rotating brush, the negative pressure suction force of the negative pressure suction device is weak, and there are cases where the negative ions cannot be guided to the rotating brush. Then, by rotating the bristles of the rotating brush, the outer air of the rotating brush bristles is blown upward, or a rotating flow is generated on the outer periphery, and the anions are generated by the blowing air flow and the rotating air flow outside the rotating brush. It moves with the flow, and the anion does not face the rotating brush direction, it becomes difficult to reach the inside of the bristles of the rotating brush and the medals sandwiched between the bristles, and the neutralization effect by the anions becomes insufficient, It was difficult to eliminate the adhesion of garbage brush hair and medals.
In this regard, in the present invention equipped with an air feed fan, the released anions are forcibly sent to the rotating brushes and medals by the forced air flow sent to the rotating brush by the air feeding fan. It is possible to increase neutralization and increase the suction of garbage.

FIG. 1 is an explanatory diagram of the overall structure of the first embodiment. FIG. 2 is an exploded perspective view of the first embodiment. FIG. 3 is an explanatory diagram illustrating a rotating means of the rotating brush according to the first embodiment. FIG. 4 is an explanatory view showing a medal polishing state of the first embodiment. FIG. 5 is a side view of the rotating brush according to the first embodiment. FIG. 6 is a front view of the rotating brush according to the first embodiment. FIG. 7 is an explanatory diagram illustrating the overlapping of the tip ends of the bristles of the rotating brush according to the first embodiment. FIG. 8 is an explanatory view showing a state of medal polishing by the brush bristles of the rotating brush according to the first embodiment. FIG. 9 is an explanatory diagram of the structure of the medal dirt inspection instrument used in Example 1. FIG. FIG. 10 is an explanatory diagram showing dirt on the dirt inspection body and its evaluation by the medal dirt inspection instrument in Example 1. FIG. 11 is an explanatory diagram of the overall structure of the second embodiment. FIG. 12 is an explanatory view showing the arrangement of the medal guide and the discharge chute according to the second embodiment and the state in which the medal guide and the discharge brush are inserted into the rotation locus. FIG. 13 is an enlarged perspective view showing the shape of the medal guide and the discharge chute according to the second embodiment. FIG. 14 is an enlarged cross-sectional view showing the medal guide and the protruding portion and the extending portion of the discharge chute according to the second embodiment. FIG. 15 is an explanatory view showing the arrangement of the medal guide and the discharge chute facing the lower rotating brush of the second embodiment. FIG. 16 is a perspective view showing another embodiment of the medal guide plate / medal guide and the protruding portion / extending portion of the discharge chute according to the second embodiment. FIG. 17 is a structural explanatory view showing the overall structure of Example 3 using a grindstone plate. FIG. 18 is an explanatory view showing the elastic support structure of the grindstone plate of Example 3. FIG. 19 is an explanatory view showing the brush polishing state of the third embodiment. FIG. 20 is an explanatory diagram of the medal polishing state of the third embodiment. FIG. 21 is an explanatory view showing the overall structure of Example 4 in which an air supply fan is attached to the ion emission device. FIG. 22 is an exploded perspective view of the fourth embodiment. FIG. 23 is an explanatory diagram showing an operation state of the fourth embodiment.

As the anion released from the anion emission device, an ionic substance is mainly selected which is an anion particle obtained by charging a fine particle water with a negative (negative) ion.
In addition to the initial speed of ion release, the force to send the negative ions released in the present invention to the rotating brush and the medal is the rotation generated by the sucked air flow generated by the negative pressure suction device and the air supply fan. There is a method based on the aerodynamic force of the forced air flow in the brush direction.

Embodiments 1 to 4 of the present invention will be described below with reference to the drawings.
Example shown in FIG. 20 1,2,3 ventilation slits 10 ₁ provided above the casing 10 in which a negative ion emitting device, the ventilation slits 10 of the upper casing by a negative pressure suction device 12 generates an operating ₁ by introducing air into the space inside the upper and lower casings 10 and 11 to rise to the rotating brush 21 _{to 24} downward air flow toward to the rotating brush 2 ₁ to release the anions is placed on the air flow 2 ₄ , send to medal m. Neutralizes the static electricity in them, and loses the force of adhering to the brush bristles 4 ₁ to 4 ₄ and the medal m due to the static electricity of the garbage, so that the brush bristles 4 ₁ to 4 ₄ and the batter of the garbage are peeled from the surface of the medal m -Separation was ensured, and negative pressure suction ensured removal of dust by suction.

Example 4 shown in FIG. 21 to 23 are examples of the invention of claim 2, rotates at a rotational airflow anions released from the anion-emitting device is produced by the rotation of the rotary brush ₂₁ to ₂₄ In contrast to preventing the inside of the brush from entering, a strong air flow to the rotating brush medal is forcibly generated by the air supply fan 40, and the discharged anions are reliably transmitted to the rotating brushes 2 ₁ to 2 _4. This is an example in which the neutralizing power is increased by sending out the entire brush hair and the medal surface.

Hereinafter, as an embodiment of the present invention, the first embodiment shown in FIGS. 1 to 10, the second embodiment shown in FIGS. 11 to 16, the third embodiment shown in FIGS. 17 to 20, and the claims shown in FIGS. A fourth embodiment which is an embodiment of the second invention will be described with reference to the drawings.
Each of the embodiments is a polishing apparatus for a medal having a diameter of 25 mm and a thickness of about 1.6 mm used in an amusement shop, and the surface (upper surface, lower surface) of the medal has a store name, a figure, a symbol, and a mark indicating the store name. It is imprinted, and minute irregularities of 1 mm or less are formed.

Example shown in FIG. 10. 1 is an example of generating a downward air flow takes in outside air from the ventilation slits 10 ₁ in the negative pressure air. Claims 1, 3, 4, 5, 6 and 7 are embodiments of the present invention, which are basic embodiments of the present invention, and are vertically opposed medal guides having no projecting portions and extending portions; The example has an anion emission device that has an opposing discharge chute and discharges anions obtained by charging negative (negative) ions to fine particle water, and the depth δ of the overlapping portion of the vertically opposed rotating brushes is 2 As a comparison, a rotating brush having a rotating brush depth of less than 2.0 mm and a rotating brush exceeding 4.0 mm is prepared as a comparative reference. It is the example which did the comparative test of the influence of the dimension of. The inspection of the dirt on the medal after polishing is an example in which the inspection instrument shown in FIG. 9 is used and the dirt on the dirt inspection body as shown in FIG. 10 is visually evaluated.

  In Embodiment 2 shown in FIGS. 11 to 16, each medal guide facing in Embodiment 1 is provided with a triangular forward / rear protrusion, and an extending portion is provided at the front end of the facing discharge chute. FIG. 6 is an embodiment of the invention of claim 7 in which 6 is cited.

  In Embodiment 3 shown in FIGS. 17 to 20, the grindstone plate that sharpens the tip of the bristles of the rotating brush in Example 1 is elastically supported so that the tip of the bristles contacts each rotating brush. is there.

  The embodiment 4 shown in FIGS. 21 to 23 is an embodiment of the invention of claim 3 and forcibly feeds the anion released in the vicinity of the anion emission device in the embodiment 1 in the direction of the rotating brush by the air flow of the blower fan. In this example, a blower fan is provided in the upper casing above the rotating brush in order to ensure neutralization by ions and to facilitate sending of dust, dirt, and fine pieces in the lower suction direction.

  In addition, this invention is not restricted to the example combination structure of Examples 1-4, In addition, it includes also the various combination of the characteristic structure of Claims 2-9.

Hereinafter, reference numerals in the drawings of Examples 1 to 4 will be described.
G ₁ is a medal polishing apparatus according to the _first embodiment, G ₂ is a medal polishing apparatus according to the _second embodiment, G ₃ is a medal polishing apparatus according to the _third embodiment, and G ₄ is a medal polishing apparatus according to the _fourth embodiment. Indicates the device. m is a medal, δ is the depth of the overlapping portion of the brush bristles (4 ₁ , 4 ₂ ) and brush bristles (4 ₃ , 4 ₄ ) of the opposed rotating brushes (2 ₁ , 2 ₂ ), (2 ₃ , 2 ₄ ) Indicates the length of the length.
In the figure, 1 is a transport path for medals m, 2 ₁ , 2 ₂ , 2 ₃ and 2 ₄ are rotating brushes having an outer diameter of 38 mm facing each other up and down, and 3 ₁ , 3 ₂ , 3 ₃ and 3 ₄ are each rotated. brush _{2 1,} 2 _2, 2 3, _{2 4} of the rotary _shaft, 4 _1, 4 _2, 4 3, _{4 4} each rotary brush _{2 1,} 2 _2, 2 3, _{2 4} of nylon bristles _{5 1} , _{5 2} oppositely disposed medal _guide, 5 _{11, 5 12} medal guide _{5 1} of the front, _rear, 5 _{21, 5 22} medal guide _{5 2} of the front, _rear, 6 _{11, 6 12} forward projecting portion is projected from the front end _{5 11} or the rear end _{5 12} of the same medal guide _{5 1} about 3 mm, the rear _protrusion 6 _{21, 6 22} to protrude from the medal guide _{5 2} of the front _{5 21} or rear end _{5 22} forward projection portions, the rear projecting _portion, 7 1, _{7 2} is provided behind the rotating brush ₂ 3, _{2 4} Vertically opposite the discharge chute _was, 7 _{11, 7 21} discharge chute ₇₁ at the front end, the front end of the discharge chute _{7 2, 8 1} rotating brush ₂ 2 from the discharge chute ₇₁ of the front end _{7 11, 2 3} bristles extending portion which extends into the rotational locus within 8 ₂ is stretched portion is stretched to insert the rotary brush 2 ₄ bristles of the rotating the locus from the discharge chute 7 ₂ of the front end 7 _21.

_Moreover, 91 to 93 ₈ is a structural part of the rotary brush 21 _{to 24} of the rotating _mechanism, 9 _1, 9 _2, 9 3, _{9 4} each rotary shaft _{3 1,} 3 _{2, 3} 3, 3 ₄ , the upper and lower interlocking gears (9 ₁ , 9 ₂ ) and (9 ₃ , 9 ₄ ) mesh with each other. 9 ₅ , 9 ₆ are timing belt gears attached to the rotating shafts 3 ₂ , 3 ₄ , 9 ₇ is a motor for rotating the rotating brushes 2 ₁ , 2 ₂ , 2 ₃ , 2 ₄ , and 9 ₈ is the motor timing belt gear which is axially mounted on the output shaft, 9 ₉ is a timing belt for transmission to interlock the gear 9 _5, 9 _6, 9 _8. Upper casing 10 to form the abrasive part with the rotating brush, 10 ₁ vent slit provided in the ceiling portion of the upper casing, the lower casing 11 to form the abrasive part with the rotation brush, 12 suction device, 12 ₁ suction port formed in a bottom surface of the lower casing 11 of the suction device, 12 _second suction pipe connected to the suction port 12 _1, 12 air blower ₃ for generating a negative pressure which is provided in the middle of the suction pipe 12 _2, 12 ₄ is a filter bag to capture dust, dirt, fines provided inside the suction pipe 12 ₂ of the previous air supply fan 12 _3, an exhaust pipe that emits connected to the suction pipe 12 ₂ air atmosphere 13, 14 anion emission device that emits anions negative charge water particles are charged, 14 ₁ the ion concentration and anions are produced in the same negative ion emitting device (negative charge amount value) Rotating Anion generator unit can be adjusted depending on the charge amount of static electricity of shea, 14 ₂ ion emission tubes, which emit the negative ions generated by the anion generator 14 ₁ to the upper casing 10, 20 is primarily a medal m horizontal rotary primary polishing section for cleaning and polishing, the 21 same following polishing portion of the rotating disk, 21 ₁ rotating brush portion of the annular flocked perpendicular bristles annularly on the outer periphery of the rotating disk 21, 21 ₂ A circular central portion of the turntable 21, 22 is a rotation shaft of the turntable 21, 23 is a belt wheel attached to a lower portion of the rotation shaft 22, 24 is a motor for rotating the turntable 21, and 25 is an output shaft of the motor. axially mounted the pulleys, the transmission belt 26 to the transmission belt wheel 23, 25, the primary polishing section of the casing 27, 27 ₁ inlet medal m to drop from above, 27 ₂ rotation of the annular brush portion 21 medal m on the ₁ Discharge port for discharging to the conveying path 1, 27 ₃ medal guide plate for restricting the upper and lower discharge ports 27 _2, 27 ₄ in triangular shape toward the rotating brush ₂ 1, _{2 2} from the front end of the medal guide plates 27 ₃ stretched stretching section, 28 is a fixed annular brush portion flocked bristles downward part of the annular brush portion 21 ₁ of the upper casing of the rotating disk 21.

30 rotary brush _{2 1,} 2 _2, 2 3, _{2 4} of bristles _{4 1,} 4 _2, 4 3, ₄ grinding plate for ₄ tip sharpened, 30 ₁ grindstone layer of the contact surfaces, 30 ₂ retractable shaft supporting the grinding plate, 30 ₃ spring for urging the grinding wheel plate 30 in the direction of the rotary brush 30 ₄ attached fixing plate of the grinding plate 30, 40 near the upper casing of the anion discharge pipe 14 ₂ 10 is an air supply fan that guides negative ions provided in the direction of the rotating brush. 50 inspection instrument of dirt, 51 lower frame of the inspection tool 50, the upper frame 52 which is hinged to the lower frame, 52 ₁ hinged portion of the upper frame 52 and lower frame 51, 52 ₂ upper frame 52 is an open / close lock band capable of locking the closed state of the lower frame 51 and the lower frame 51. 53 15 mm × 50 mm × 6 mm dirt inspected elongated made sponge, contamination inspection body fixing pieces restrained against movement by the same stain test bodies 54, 54 ₂ restraint piece 55 on the upper surface of the dirt inspected A rubber rotation pressurizing unit 56 that presses and rotates the polished medal m, 56 is a medal rotation operating shaft that is rotatably supported on the upper frame 52, and 57 is the same. A handle 58 attached to the head of the medal rotation operation shaft 56 is a spring that urges the rotation pressurizing portion downward.

(Structure of Example 1)
A first embodiment shown in FIGS. 1 to 10 is a basic structure of the present invention, and is between two pairs of upper and lower opposed rotating brushes 2 ₁ and 2 ₂ and opposed rotating brushes 2 ₃ and 2 ₄ . The medal guides 5 ₁ and 5 ₂ that are horizontally opposed to each other so as to sandwich the conveyance path 1 and the discharge chutes 7 ₁ and 7 ₂ that are vertically opposed are provided, and the rotary brushes (2 ₁ , 2 ₂ ), (2 ₃ ) that are vertically opposed to each other. changes 0,1.0,2.0,3.0,4.0Mm, the length of the bristles _{41 to 4} above 4.0mm the length of the overlapping portion of the rotary brush δ _{2 4)} Therefore, the influence of the length δ on the polishing force can be tested. The medal guides 5 ₁ and 5 ₂ and the discharge chutes 7 ₁ and 7 _{2 according} to the first embodiment do not have the front projecting portion 6 ₁₁ , the rear projecting portion, and the extending portions 8 ₁ and 8 ₂ . Further, the anions generated by the anion generator 14 ₁ from above the polishing space of the lower casing 11 and the upper casing 10 surrounding the rotating brushes 2 ₁ , 2 ₂ , 2 ₃ , 2 _4, and the lower rotating brush 2 ₁ , It emits in the direction of 2 ₂ , 2 ₃ , 2 ₄ .

Rotation of the rotary brush 21 _{to 24} sends a timing belt _{9 9} actuates the motor _{9 7} rotates the gear ₉ 5, _{9 6,} the lower that pivotally attached to the rotary shaft ₃ 2, _{3 4} the interlocking gear ₉ 2, _{9 4} rotates, the interlocking gear ₉ 1, _{9 3} upper meshing with the interlocking gear by rotating, to rotate the rotary shaft ₃ 1 to 3 _4, in the rotary shaft The rotating brushes 2 ₁ to 2 ₄ that are attached to the shaft are rotated in the opposite direction to each other in the direction in which the medal m is sent.

Further, before the polishing by rotating the brush ₂₁ to ₂₄ mentioned above faces in Example 1 was charged with spent medals m to a horizontal turntable 21, a rotating brush portion 21 ₁ of the upper and lower surfaces of the outer peripheral portion fixed annular The brush part 28 performs primary polishing of the medal m.

(Operation of Example 1)
Medals m dirty in use, is dropped is fed into inlet 27 ₁ of the horizontal rotary primary polishing section 20 to the circular central portion 21 ₂ on the turntable 21. Medals m that have fallen into the central portion 21 ₂ receives a centrifugal force due to high speed rotation of the rotating disk 21, and moves while rotating in the outer circumferential direction of the rotating disk 21, a rotary brush unit 21 ₁ and the upper stationary annular brush portion 28 Between the upper and lower brush tips, and from the rotational force, centrifugal force and the resistance of the upper and lower brush hairs, spirally move to the outer peripheral direction, reach the outer peripheral frame of the rotating disk, and follow the outer peripheral frame moves guided by the medal guide plate 27 ₃ of the upper and lower faces from the discharge port 27 ₂ to the conveying path 1 by rotating Te. Medals m by the brush bristles between the rotating brush portion 21 ₁ and the stationary annular brush portion 28 of the medal m is cleaned and polished, it will be sent to the conveying path 1 from the discharge port 27 ₂ are made and polished primary cleaning .

The medal m sent to the transport path 1 is sent along the transport path 1 in the middle of the overlapping portion of the brush bristles 4 ₁ and 4 ₂ of the upper and lower rotating brushes 2 ₁ and 2 ₂ (see FIG. 7). Tip of the bristles 4 ₁ of the rotary brush 2 ₁ to the upper surface of the medal m is contacted in a state of and slightly Shiwa' was as plugging (see Figure 8). Such bristles 4 ₁ rotating in a state performs polishing and cleaning the surface of medals m moving at the required speed along the conveying path 1. The tip of the brush bristles pierces the melodic m flat surface and the corners of the medal m, and scrapes dust, dirt, and fine pieces adhering to them with its rotational force, elastic force, or medal movement speed. Scatter outside. The back surface (lower surface) Similarly medals back surface by the rotary brush 2 ₂ lower medal m cleaned and polished by the brush bristles 4 _2. Further, the medal m is sent out in the transport direction in the left direction in the figure by the rotational force and brush frictional force of the brush bristles 4 ₁ and 4 ₂ of the rotary brushes 2 ₁ and 2 ₂ .

Rotary brush 2 _1, 2 also ₂ medals m passing through the by when the movement direction upward or downward is Henra is generated in the force from the rotary brush 2 _1, 2 _2, a pair of upper and lower medal guide 5 _1, 5 ₂ jump out upward medal m from the conveying path 1 by, or regulated to become dropping direction downward, to send medals m along the transport path 1.

If is regulated by these medal guide 5 _1, 5 ₂ are sent to the conveying direction, are fed to the next set of rotary brush 2 _3, 2 ₄ of bristles 4 _3, 4 ₄ intermediate position, the similarly same The front surface (upper surface) and the rear surface (lower surface) of the medal m are cleaned and polished by the brush bristles 4 ₃ and 4 ₄ . When the second set of rotating brushes 2 ₃ and 2 ₄ are cleaned and polished, they are regulated by the discharge chutes 7 ₁ and 7 ₂ and discharged.

The friction between the brush bristles made of nylon of these rotating brushes (2 ₁ , 2 ₂ ) and (2 ₃ , 2 ₄ ) and the bristles 4 ₁ , 4 ₂ , 4 ₃ , 4 ₄ and the metal medal m Although static electricity by friction is likely to occur, negative ions generated in the anion generator of the present the anion emission device 14 are emitted toward the rotary brush ₂₁ to ₂₄ and medals m from the ion discharge pipe 14 ₂ Thus, the static electricity generated in the brush hairs 4 ₁ to 4 ₄ and the medal m is neutralized by anion, and dust, dirt, fine pieces, and powder adhere to the brush hairs 4 ₁ to 4 ₄ and the medal m due to static electricity. Suppresses staying and reattaching, and encourages dust, dirt, fine pieces, and powder to fly into the air, and to peel off from brush hair and medals m. As a result, the suction device 12 can reliably perform suction and removal.

Thus, peeled and separated the rotary brush 21 _{to 24} in dust, dirt, fines, powders adhered to the bottom surface of the corner-recessed portion of the surface-irregularities Medals m such by the brush bristles 4 _{1-4 4,} Disperse into the air.
Then, the suction device 12 is operated in the state. Air blower 12 ₃ by generating a negative pressure in the suction port through the suction pipe 12 _2, sucks the dust, dirt, fines, powders that are scattered in the air together with air into the suction port 12 _1, the suction pipe 12 feed through _2, if Re most captured by the filter bags 12 ₄ savings was drained each bag, and so as to release only the cleaned air.

Note that the ceiling surface of the upper casing 10 have provided ventilation slits 10 _1, minutes for discharging the sucked in air from the suction port 12 _1, have introduced indoor air from the ventilation slits 10 _1. Anion air flow from the ventilation slits 10 ₁ is moved to the rotary brush 21 _{to 24,} it is to ensure neutralization of static electricity.

The test of the influence of the cleaning / polishing force due to the length δ of the overlapping portion of the opposing rotating brush bristles will be described. The length δ of the overlapping portion of the brush bristles with the rotating brushes (2 ₁ , 2 ₂ ) and (2 ₃ , 2 ₄ ) of Example 1 is set to 0.0, 1.0, 2.0, 3.0, 4 The setting was changed to 0.0 mm, and the dirt condition of the medal m polished through the discharge chutes 7 ₁ and 7 ₂ was inspected and evaluated. Wiping by polishing 10 used medals m having the same soiling to the same length δ of 0.0, 1.0, 2.0, 3.0, 4.0mm Used for inspection with the inspection device 50 for level evaluation. Ten polished medals m each having a length of δ are placed on a sponge-like small elongated rectangular parallelepiped dirt inspection body 53, and the medal m is rotated to rub dirt adhered to the medal m against the dirt inspection body 53. In addition, the level of dirt of the dirt inspection object 53 at five types of δ length was visually evaluated to evaluate the level at which the medal m was cleaned and polished. As for the evaluation level, a five-step visual evaluation was performed as shown in Table 1 below.

(Description of dirt inspection equipment)
As an instrument for inspecting the adhesion state of dust, dirt and fine pieces remaining on the surface of the medal after polishing the medal, the inspection instrument 50 shown in FIGS. 9 and 10 and the dirt adhering to the surface of the medal are wiped off from the medal surface. A sponge dirt inspection body 53 is used to test the remaining dirt on the medal based on the degree of dirt wiped off. FIG. 10 shows the evaluation levels 1 to 5 and the degree of contamination of the contamination inspection body 53 for wiping level evaluation.

Inspection tool 50 is opened and closed the upper frame 52 at the hinged portion 52 ₁ at one end of the metal of the lower frame 51 in a compact device as shown in FIG. 9, in the closed state closing rock band 52 ₂ which can lock it It can be held.
The lower frame 51 is provided with a dirt inspection body fixing piece 54 that restrains the sludge inspection body 53 made of an elongated sponge so as not to move from side to side and from front to back. Also has a restraining piece 54 ₂ in the left and right horizontally rotatably held without sliding the medals left to check put on the center of the upper surface of the dirt inspected 53.
Further, a medal rotation operation shaft 56 is provided at the center of the upper frame 52 so as to pass through the surface of the upper frame 52 at a right angle, and at the lower end of the medal rotation operation shaft 56, a rubber rotation pressing portion 55 is provided. Is fixed, and a spring 58 is provided between the rotation pressure unit 55 and the ceiling surface of the upper frame 52. Further, a handle 57 for rotating the medal rotation operation shaft 56 is attached to the upper end of the medal rotation operation shaft 56. In addition, there is a pair of dirt inspection body pressing pieces (not shown) suspended from the lower surface of the upper frame 52.

(About dirt inspection methods using dirt inspection equipment)
First, a new 15 mm × 50 mm × 6 mm thick sponge test object 53 made of sponge is set inside the test object fixing piece 54 at the center of the lower frame 51. Put a medal m of dirt testing on a set soils inspected 53 stop lateral movement with restraint piece 54 _2. In this way, held in a state where the upper frame 52 closed closed by opening and closing the lock band 52 _2. Left and right opposite to restrain the dirt inspected fixing piece 54 provided in the restraining piece ₅₄₂ back and forth in this state, the front and rear sponge dirt inspected dirt inspected pressing piece which is vertically from the upper frame 52 (not shown) The dirt inspection body 53 is prevented from moving by pressing left and right. Then, the medal to be inspected is placed on this.

  Next, when the handle 57 is rotated so that the handle 57 at the head of the medal rotation operation shaft 56 is pushed down by hand and the medal m is pressed against the dirt inspection object 53, the rubber rotation pressurizing unit 55 is moved to the medal m. Is pressed against the dirt inspection body 53, and by rotating it, the dirt on the lower surface of the rotating medal m is transferred to the dirt inspection body 53 and the surface of the dirt inspection body 53 is soiled. The medal is rotated by rotating the handle 57 a predetermined number of times. This is repeated with ten medals m polished at the same length δ, and the dirt of the medal m after polishing is transferred to the dirt inspection body 53, and the final dirt state of the dirt inspection body 53 is visually observed. Thus, the polishing performance of the medal polishing apparatus of the present invention was confirmed.

In the present invention, by adjusting the dirty medals m same degree of rotary brush 21 _{to 24} bristles overlap length δ at 1.0mm units 0.0～4.0Mm, length of each δ The ten polished medals m were stained on the dirt inspection body 53 with the dirt inspection instrument 50 and compared visually to determine the relationship between the length δ and dirt removal. As shown in Table 1, the dirt was divided into levels 1 to 5 and visually evaluated, and the level was evaluated by a plurality of visual inspectors, and the degree of dirt was evaluated based on the average value.

  With the medal polishing apparatus of Example 1 above, the evaluation of the contamination with respect to the length δ of the overlapping portion of the brush bristles was as shown in Table 2 below.

Thus, the length of the overlapping portion of Example 1, the rotary brush ₂ 1 to 2 ₄ [delta] (lapping) is a level 3 "there degree dirt is removed" in 2.0~4.0mm From the evaluation of Level 1, it is an evaluation of Level 2 that “substantially dirt is removed”, which is close to the evaluation of Level 1 that is “substantially dirt is removed”. Therefore, δ can be estimated to be a level equivalent to 2.0 mm, which is estimated to be better than level 3, and it was determined that the removal of dirt was good. In particular, when the length of δ is 3.0 to 4.0 mm, it is about level 2 which is close to level 1, indicating that the removal of dirt was excellent.

(Example 2)
Example shown in FIG. 11 to 16 2, the rotary brush ₂ 1 faces the front end _{5 11} and a rear end _{5 12} of opposed upper and lower pair of the medal guide ₅ 1, _{5 2} In Example 1, _{2 2} , ₂ 3, _{2 4} towards protrudes forward protrusion _{6 11} and the rear protrusion _{6 12} triangular. Its forward and backward of the protrusion _{6 11, 6 12} length t of the overhang is from the front end _{5 11,} the rear end _{5 12} about 3 mm. Further, a pair of upper and lower discharge chute ₇ 1, _{7 2} in triangular extending portion extending a length t is 3mm also ₈ 1, _{8 2} rotating brushes ₂ 3, _{2 4} discharge chute ₇ 1 towards, 7 _This is an example of extending from the front ends 7 ₁₁ and 7 ₂₁ of No. ₂ . Other structures are the same as those of the first embodiment.

Thus was extended from Example 2, the medal guide ₅ 1, _{5 2} of 3mm of the front projecting portion _{6 11,} the rear protrusion _{6 12} and discharge chute _{71, 7 2} of the front end _{7 11, 7 21} about 3mm extending portion _{81, 82} the rotary brush _{2 1,} 2 _2, 2 3, _{2 4} of bristles _{4 1,} 4 _2, 4 3, ₄ are inserted into the _fourth rotary in locus (see Fig. 12, 14 ).
In Example 2, the tip of the bristles ₄₁ to ₄ medal guide ₅ 1, _{5 2} of the front-rear extending portion _{6 11,} 6 _12, 6 _{21, 6 22} or elongated portions _{81, 82} contact To do.
Thus, the tip of the bristles _{41 to 4} in contact with these forward and backward extending portion _{6 11,} 6 _12, 6 _{21, 6 22} or elongated portions _{81, 82,} bristles ₄ 1 4 ₄ of the distal end portion thereof projecting portion ₆ 11 dust, dirt, fines adhering _to, 6 _12, 6 _{21, 6 22} and extending portion _{81, 82} forcibly peeled in the bristle ₄ 1-4 Separate from ₄ .

Further, the brush bristles _{41 to 4} forward and backward protrusion ₆ 11 in which the _triangular, 6 _12, 6 _{21, 6 22} or by extending portion _{81, 82} rotation shaft of the rotary brush 21 _{to 24} by ₂ The brush hairs 4 ₁ to 4 ₄ are vibrated in the axial direction by dividing the brush bristles in the axial direction of 3 _{1 to} 3 ₄ , thereby shaking dust, dirt, and fine pieces adhering to the brush hairs 4 ₁ to 4 ₄ to air Separate and release. Further, the brush bristles 4 ₁ to ₄ 4 that vibrate in the axial direction give an axial polishing force to the surface of the medal m. Not only before and after the rotation direction but also the axial direction perpendicular to this is scraped and plucked out, so that separation and release of dust into the air is effective. Incidentally, dust or the like separated and released into the air are eliminated is sucked together with air by the same way the suction apparatus 12 of Example 1 to the suction port 12 _1.

FIG. 16 shows another example of the second embodiment. In the example of FIG. 16, the extending portion 27 ₄ projecting in a triangular shape is also inserted into the rotary brush 2 _1, 2 ₂ of the rotating the locus upstream rear end of the medal guide plates 27 ₃ at the top pair pairs Provided. Furthermore, the pitch spacing of the medal guide plate 27 _third extending portion 27 ₄ and the discharge chute _{71, 7 2} of the triangular extending portion _{81, 82} along the longitudinal direction is short. Medal guide ₅ 1, _{5 2} front protrusion ₆ 11 _{projecting, 6 21,} the pitch interval along the longitudinal direction of the rear projecting portion _{6 12, 6 22} is longer, extending portion _{81, 82,} It is about 2 times the pitch spacing of 27 ₄ ones.

In the example of FIG. 16, in addition to the effect of the structure of the embodiment 2 of FIG. 12 to 15, bristles ₄ 1 of the rotary brush ₂ 1, _{2 2, 4 2} and the extending portion 27 ₄ of the medal guide plates 27 ₃ contact with the brush bristles _41, 42 attached ₂ separate away off the dust, dirt, particulates piece or the like are also bristles 4 by contact with the brush bristles 4 _1, 4 ₂ and extending portion 27 _{4 1} and 4 ₂ is vibrated to increase the effect of separating and releasing the deposits such as dust and the like, effectively collecting the dust and reducing reattachment.

Furthermore, shorter medal guide plate 27 ₃ of the triangular extension portion 27 ₄ and the discharge chute _{71, 7} triangular extending portion ₈₁ of the _{2, 8 2} pitch in the example of FIG. 16, the medal guide in the middle 5 _{1, 5 2} forward and backward of the triangular protrusions _{6 11,} 6 _12, 6 _{21, 6} pitch of ₂₂ long, the extension part _{27 4,} 8 1, _{8 2} 2 times the length pitch since there are (interval), the rotary brush _{2 1,} 2 _2, 2 3, _{2 4} of the extending portion ₈₁ of the bristles _{41 to 4,} 8 2, 27 ₄ and the contact position between the projecting portion ₆ 11, 6 _{12, 6 21,} the contact position between 6 ₂₂ are different, contact without thoroughly without biased brush bristles of the rotary brush, yet vibration of different frequency to the rotation axis direction of the brush bristles of the rotary brush is generated Will be fluctuated and stretched with the above bristles 8 _{1, 8} 2, and is 27 ₄ and the projection _{6 11,} 6 _12, 6 _21, further enhance such a peeling and separating effects by contact with _{6 22.}

(Example 3)
Embodiment shown in 17-20 Example 3, Example 1 rotary brush 21 _{to 24} bristle _{41 to 4} at the tip is contacted with grinding layer of the grinding plate 30 bristles ₄ 1-4 ₄ in The tip of the blade is sharpened so that it can be pierced into the irregularities on the surface of the fine medals, and the scraping force of dust and the like can be effectively scraped off. The grinding plate 30 that is biased by a spring 30 ₃ to rotary brush 21 _{to 24} direction, and ensures the brush tip grinding by the grinding wheel, maintaining a high polishing power of the brush bristles ₄₁ to ₄ It is an example that can.
This structure can also be applied to the second embodiment of the first embodiment.

Example 4
Example shown in FIG. 21 to 23 4, although using same anion release device 14 as in Example 1, the negative ions emitted from the ion discharge pipe 14 ₂ of Example 4, anion emission device 14 send forced to rotary brush 21 _{to 24} by the air flow is generated by two air fans mounted on the upper casing 10, ensures the feed with the anion to the bristles ₄₁ to ₄ and medals m In addition, the bristle 4 ₁ to 4 ₄ and the medal m are completely neutralized, and static electricity generated by friction is reliably neutralized, and dust, dirt, and fine pieces adhere to the brush bristle / medal m surface due to static electricity. suppresses strongly, with dust or the like to facilitate release, airborne, induces dust to the suction port 12 ₁ in the air flow of the air fan 40 and dust, ensures suction-elimination of dust This is an example.

Note that the medal guide ₅ 1, _{5 2} forward and backward protrusion ₆ 11 Example _1, the _{6 12} and discharge chute ₇₁ of Example 4, _{7 2,} extending portion ₈₁ on the medal guide plate 27 _3, 8 _2, 27 ₄ are not, but the medal guide ₅ 1, _{5 2} and the discharge chute ₇₁ as in example 2, _{7 2,} medal guide plate 27 ₃ forward and backward extending portion _{6 11, 6 12,} extension part 8 _{1, 8} 2, 27 ₄ may be provided. And the combination which makes the grindstone of Example 3 contact the front-end | tip part of rotating brush hair is also effective.

  Although the present invention has been described mainly with medals used in amusement stores, it can also be used for polishing and cleaning coins used in vending machines and coins used in ticket purchase machines used for transportation. .

G ₁ , G ₂ , G ₃ , G ₄ Polishing device for medals of Examples 1, ₂ , ₃ and ₄ m Medal δ Length of rotating brush overlapping portion t Length of front / rear protruding portion or extending portion 1 Carriage path 2 ₁ , 2 ₂ , 2 ₃ , 2 ₄ Rotating brush 3 ₁ , 3 ₂ , 3 ₃ , 3 ₄ Rotating shaft 4 ₁ , 4 ₂ , 4 ₃ , 4 ₄ Brush bristles 5 ₁ , 5 ₂ Medal guide 5 ₁₁ front 5 ₁₂ rear 6 _{11, 6 21} forward protruded portion 6 _{12, 6 22} rearward projection portions 7 _{1, 7 2} discharge chute 7 _{11, 7 21} front end _{81, 82} extension part 9 _{1, 9 2, 9} 3, 9 ₄ interlocking gear 9 ₅ , 9 ₆ gear 9 ₇ motor 9 ₈ gear 9 ₉ timing belt 10 upper casing 10 ₁ ventilation slit 11 lower casing 12 suction device 12 ₁ suction port 12 ₂ suction pipe 12 ₃ air supply fan 12 ₄ filter bag 13 Exhaust pipe 14 Anion releasing device 14 ₁ Anion generating unit 14 ₂ Ion releasing tube 20 Horizontal rotation type primary polishing unit 21 Rotating disk 21 ₁ rotating brush unit 21 ₂ Central portion 22 Rotating shaft 23, 25 Belt wheel 24 Motor 26 Transmission belt 27 Casing 27 DESCRIPTION OF SYMBOLS ₁ Input port 27 ₂ Discharge port 27 ₃ Medal guide plate 27 ₄ Extending part 28 Fixed annular brush part 30 Grinding wheel board 30 ₁ Grinding wheel layer 30 ₂ Retreating shaft 30 ₃ Spring 30 ₄ Mounting fixing plate 40 Air supply fan 50 Inspection tool 51 Lower frame 52 Upper frame 52 ₁ Hinge for attaching the upper frame 52 to the lower frame 51 52 ₂ Opening / closing lock band 53 Dirt inspection body 54 Dirt inspection body fixing piece 54 ₂ Restraining piece 55 Rotating pressure unit 56 Medal rotating operation shaft 57 Handle 58 Spring

Claims (12)

One or a plurality of pairs of opposed rotating brushes that clean the surface of the medals by contacting the top or bottom surface of the medals to be transported are arranged along a medal or coin medals transport path. At the same time, the medals that are close to each other so that their rotation trajectories overlap each other at a required depth when there are no medals at the tip of the rotating brush, and are in contact with the rotation direction of each rotating brush are sent in the transport direction. In a medal polishing apparatus comprising rotating means that rotate in opposite directions and a suction device that sucks dust, dirt, or fine pieces separated or separated from the surface of the medal with a rotating brush under a negative pressure. ,
An ion release device that discharges negative ions from the position opposite to the suction port side of the suction device to the opposite side across the transport path is provided along the transport path of medals. A pair of medal guides for restricting medals from being removed from the transport direction in the transporting direction of the opposed rotating brush provided, and there are a plurality of opposing rotating brushes along the transporting path, From the front end toward the front so as to be inserted into the rotation trajectory of the brush bristles of the front rotation brush along the front end perpendicular to the conveyance direction of the conveyance path of the medal guide provided between the pair of opposed rotation brushes A plurality of projecting front projecting portions are provided at a predetermined interval, and projecting rearward from the rear end so as to be inserted into the rotation locus of the bristles of the rear rotating brush along the rear end of the medal guide. A plurality of rear protrusions are provided at a predetermined interval, and the front protrusions and rear protrusions at the front and rear ends of the medal guide come into contact with the brush bristles of the front and rear rotating brushes to scrape dust, dirt, or fine pieces adhering to the brush bristles. An apparatus for polishing medals, wherein the brush bristles are vibrated to increase separation / separation of dust / dirt or fine fragments .   The medal polishing apparatus according to claim 1, wherein a ventilation port for taking in outside air is provided at a position above the anion emission port of the ion emission device on a ceiling surface of a casing that accommodates the opposed rotating brushes.   The medal polishing apparatus according to claim 1, wherein an air supply fan is provided near the anion discharge port of the ion emission device to send atmospheric air toward the rotary brush.   The medal polishing apparatus according to any one of claims 1 to 3, wherein the depth δ of the overlapping portion of the rotation trajectory at the tip of the rotating brush is 2.0 to 5.0 mm. The medal polishing apparatus according to any one of claims 1 to 4, wherein the front protrusion and the rear protrusion have a triangular shape . One or a plurality of pairs of opposed rotating brushes that clean the surface of the medals by contacting the top or bottom surface of the medals to be transported are arranged along a medal or coin medals transport path. At the same time, the medals that are close to each other so that their rotation trajectories overlap each other at a required depth when there are no medals at the tip of the rotating brush, and are in contact with the rotation direction of each rotating brush are sent in the transport direction. In a medal polishing apparatus comprising rotating means that rotate in opposite directions and a suction device that sucks dust, dirt, or fine pieces separated or separated from the surface of the medal with a rotating brush under a negative pressure. ,
An ion release device is provided that discharges negative ions from the position opposite the suction port side of the suction device to the opposite side of the transport path toward the bristles of the rotating brush, and is further downstream in the transport path of medals. A pair of opposed discharge chutes for guiding the discharge direction of medals provided on the delivery side of the opposed rotary brush positioned are provided, and the rotation trajectory of the brush bristle tip of the most downstream rotary brush from the chute front end of the discharge chute A medal polishing apparatus provided with a plurality of chute extending portions in which a part of the front end is extended at a predetermined interval so as to be inserted inward . 7. The medal polishing apparatus according to claim 6, wherein a ventilation port for taking in outside air is provided at a position above the anion emission port of the ion emission device on a ceiling surface of a casing that accommodates the opposed rotating brushes . The medal polishing apparatus according to claim 6 , wherein an air supply fan is provided near the anion discharge port of the ion emission device to send atmospheric air toward the rotary brush . The medal polishing apparatus according to any one of claims 6 to 8, wherein the depth δ of the overlapping portion of the rotation locus of the tip of the rotating brush is 2.0 to 5.0 mm . 10. A pair of medal guides for restricting detachment of medals from the transport direction of the transport path is provided at the sending side position of the opposed rotating brush provided along the transport path of medals. Any of the medals polishing apparatus. There are a plurality of opposed rotating brushes along the conveying path, and the brush bristles of the rotating brush on the front along the front end perpendicular to the conveying direction of the conveying path of the medal guide provided between the opposed rotating brush groups. A plurality of front protrusions protruding from the front end toward the front so as to be inserted into the rotation trajectory are provided at a predetermined interval, and in the rotation trajectory of the brush bristles of the rear rotary brush along the rear end of the medal guide. A plurality of rear projecting portions projecting rearward from the rear end so as to be inserted are provided at predetermined intervals, and the front projecting portion and the rear projecting portion of the front and rear ends of the medal guide are in contact with the brush bristles of the front and rear rotating brushes. 11. The medal according to claim 10, wherein dust, dirt or fine pieces adhering to the brush bristles are scraped off and vibrations are applied to the brush bristles to enhance separation / peeling of dust, dirt or fine pieces. Polishing equipment . The medal polishing apparatus according to claim 11, wherein the front protrusion and the rear protrusion have a triangular shape.

Images