A DETECTION SYSTEM FOR THE DETECTION OF THE SURFACE QUALITY OF BRUSHES

Abstract: A detection system whereby irregularities, roughnesses, positions, movement velocities or material specifications are detected of surfaces of brushes, whereby according to the figure as example a brush (1) is presented whereby a position difference is made between the face with drillings (19) and the face without drillings (20), whereby herefore a medium is sent through a pressure and flter unit (7) through the conductors (2) and (3) towards the detection places (19) and (20), whereby the medium under influence of the surface deformations and the material compositions will whirl, whereby depending of the whirls created this will produce a smaller or larger acoustical noise signal, whereby the acoustical signal is received, through the conductors (13) and (14) by the detectors (15) and (16) and processed in the driving unit (17), so that a signal is sent to the machine according to the position of the object (1).

Description: A detection system for the detection of the surface quality of brushes. During the production process of brushes, the new detection system makes it possible to effect a control of the brush surface, for example to detect the upper surface or bottom surface of the brushes. The detection system can aswell be used for the selection of several brushes, or to detect certain defects in the brush surface, and all this on the basis of a detection system whereby certain detection signals are received according to the surface specifications or surface condition of the brush that is controlled, seen the fact that the detection system works on the basis of the direction with a certain velocity of a gas or liquid medium towards the surface to be detected, whereby in function of the surface condition of the object, waves are created by the medium, whereby a detectable acoustical signal is created that can be processed by the detection system till a usable signal Technically, there exist systems whereby the irregularities or deforming or measurements or positions of surfaces of objects are detected by optical distance measurements or angle measurements, whereby on certain places or through the scanning of the surface the aimed data can be obtained For optical measurements, a laser beam or another light source is normally used, whereby the light beam is sent to the detection surface, whereby it will be reflected under a certain angle, whereby by reading of the different reflection angles of the light beam the different irregularities or surface measurements or deformings in the detection surface are detected Furthermore, there exist ultrosonical detectors, as described in patent US 4 285 053, whereby a ultrasonical sound signal is sent to the surface to be measured, whereby depending of the time that the sound signal needs to reflect to the sound receiver, according to the known sound transfer velocity in air, the distance is calculated of the traject made between the starting point of the signal sent and the point where the signal is received again Beside the use of contact free detection systems, there exist systems whereby by means of a mechanical device, for example a movable detection pencil, this pencil is put in contact with the surface to be detected, whereby depending from the movement measured of the detection pencil, the necessary data of the surface condition of the objects can be obtained According to patent US 4738 139, a ultrasonical detection system is described, for the control of the surface roughnesses of spindles that are processed on machines, for example a lathe, whereby in function of the measured roughness of the material surface, the condition of the cutting tool can be judged Therefore, a liquid beam, normally a water beam, is sent in a curved form to the surface to be detected, whereby a ultrasonical sound signal is sent through the water, whereby depending of the roughness of the material surface a larger or smaller amount of sound signals is reflected, as an echo, to the sound receiver that is placed upstream in the liquid beam With a perfect smooth surface, the signals sent will be drained away through the liquid With a rough surface on the contrary, part of the signals sent will be reflected, whereby the amount of the reflected signal will be used for the measurement of the roughness determination Aswell certain systems are known, whereby through a small tube compressed air is sent in a certain direction, whereby in the axis of the beam sent in the opposite direction, a sensitive pressure meter is installed that receives the gas pressure On the moment that the pressure of the beam can be detected by the pressure meter, this means, that the Gas beam has a free passage till the pressure meter towards the one the beam is directed If a plate or foil or another object or material interrupts the beam, on that moment no more pressure is detected by the pressure meter, and a signal is sent to the machine, for example to inform that there doens't exist an object .between the beam and the detector This system is aswell used by machines whereby materials or foils and other are unwinded or winded, whereby when winding or unwinding, the position of these materials or foils are controlled and adjusted When using a detection system on the basis of a light beam, the disadvantage is that the exactness of the measument can be influenced by dust, oil or other unpunty that influence the detection, seen that the light beam can be hold or screened by these unpunties or dirt Furthermore problems are caused by the detection of irregularities by transparent objects, seen that these objects let pass the light beam fully or partly without reflecting sufficiently to the light receiver for the determination of the reflection angle or signal size, so that this system is unsufficiently reliable Thus, it is not inconceivable that the metal object with a small surface roughness or deformation reflects a larger light signal, in comparison with a similar but transparant object with a larger deformation grade, seen that the light is sent through the object and is hardly reflected, however large the deformations or roughnesses might be The problem with the use of ultrasonical waves is, that the ultrasonical sound signals that are emitted can be reflected over a larger surface than the one aimed at, whereby a wrong and inaccurate measurement is made, furthermore as the system is not applicable for measurements on a short distance, seen that the time difference between the signal sent and the one reflected is not sufficiently reliable to be detected By making a detection on a large distance, this results that the detection surface has to have a minimal surface, whereby small savings or openings cannot be detected The mechanical detection systems, whereby a detection pencil or other measurement elements are put into contact with the surface to be detected, have the disadvantage that damages can be caused by the pressure made by the detection pencil on the surface to be detected, aswell that the detection pencil is subject to wear,or that the detection pencil can become dirty or damaged, whereby after a certain time the measurement correctness and reliability can be influenced negatively The detection system whereby a liquid beam is used, whereby a ultrasonical emitor is placed in the liquid beam, so that together with this liquid beam ultrasonical fibrations are sent though this liquid, whereby depending from the roughness of the surface to be detected the sound signal sent will be reflected in a higher or lower level, whereby in function of the reflected amount of fibration signals, the roughness of the surfaces can be determined This system has the disadvantage that a part of the sound signals sent, can be spread, in this case a liquid beam, whereby part of the ultrasonical sound signals on other places will reflect and through the liquid beam or the surrounding admosphere will reach the receiver These leaking signals can make the measurement uncertain Aswell, with this system no gas medium can be used, for example, pressed air, as the gasses cause an unsufficient acoustical protection with the surrounding atmosphere, whereby the ultrasonical fibrations sent that are taken with could spread directly in the surrounding, whereby the detection surface cannot be restricted within the surface or place where the gas beam comes in contact with the surface to be detected of the object The disadvantage of the system, whereby a gas beam under pressure is used, whereby a pressure meter controlles the pressure of the beam received, is, that no roughnesses of the surfaces can be controlled, but only is established if between the beam stream there exists an object or not The invention foresees in a detection system which can detect the specifications of surface(s) of brushes whereby the surface conditions are determined by the presence or not of unregulaπties or deformations or roughnesses or certain measurements or formations of the surfaces, that can create a detectable signal through the detection system, whereby before the generating of the detection signal, the detection system makes use of a medium, that with a certain velocity is sent to the surface to be detected, whereby depending from the specifications of the surface shined upon, tabulations are created or not, that produce a certain acoustical signal, that depending from the formation of the surface creates a more or less definable signal, that can be described as an unordered composition of sound signals or frequencies, aswell named noise signal, acoustical signals via one or more foreseen fibrations receivers can be received, whereby these fibration receivers contain the quality to convert the noice signal generated in a usable electrical signal The signal generated is aswell depending from the material composition or material specifications, with those the medium is contacted, as a more sound dimming material or sound absorbing fabric will create less noice signals for the same object as far as the shape goes As the detection system distinguishes between several kinds of material according to the sound dimming characteristics of these kinds of material, it makes it aswell possible, according to the known surface formation or roughness, to investigate the specifications or characteristics of the surface to be detected, whereby for example a detection distinction is made between a rubber surface or a metal surface, etc To become a detectable distinction between different material surfaces, a gas or liquid medium is used whereby the medium, with a certain velocity is sent to the surface to be detected through a conduction tube with opening, called aswell beam tube, where through the medium is sent in a beam form in the direction of the material surface to be detected When the medium used is gaseous, compressed air is normally used or when the used medium is liquid, water is normally used as a medium The medium will move in a rectilineal way or by a certain curve over a certain distance It is always the intention that the beam transmits itself as coherent as possible, whereby the parts or molecules of the beam or stream is sent to the surface to be detected on the most ordered way as possible, whereby it is avoided that the medium could create a certain noice signal, coming from certain turbulations that are caused, if the medium is disturbed by, for example, bumps in the stream tube and other more, whereby the detection signal level could be influenced Aswell, a certain interference signal in the leaving beam can be taken into account with the detection result, by setting authomatically the zero adjustment of the sound signals received on a higher level The rougnesses that need to be controlled, could have been caused by the treatment of the surface of brushes by the milling, drilling, planing, grinding, revolting, etc whereby with the control of these surfaces by the detection system, can be determined if for example, a tool needs to be replaced or if the cooling used during the working is not sufficient, or to determine if the surface worked has a sufficient smooth termination, etc Aswell, the unregulaπties in the surfaces of the materials can be described as being caused by all kinds oftreatments of the material, such as moulding, spray-moulding, extruding, drawing, bending, cutting, punching, milling, drilling, pressing, and welding of the material or objects, or by certain technics of connection such as, πvettmg, welding, glueing, bolting, etc , which can aswell determine the deformation or formation of a certain piece, whereby the form of a certain object aswell can be seen as being a junction or composition of a certain amount of large or small deformations or unregulaπties By performing a control on a certain deformation to determine that a certain treatment, for example has been made correctly, for example, if a certain drilling is performed on a certain place of a brush, by means of a gas or liquid beam, the foreseen detection place be beamed with a certain pressure, whereby depending of the created noice signal, it can be determined if the detection place generates the expected signal that corresponds to the qualities of the detection place If certain objects, for example, brush sticks, of which one side is foreseen of drillings in which small fibre bundles have to be placed, and along another side no drillings are foreseen, that on the side with drillings, on which the beam, for example, compressed air, that comes with a certain velocity in connection to those drillings, waves or certain frequences are caused, that creates an acoustical noice signal, in compaπsation to the side without drillings, whereby only a minimum of acoustical signals will be created, seen that the medium can hardly wave on this flat or plain surface, whereby in this case the direction of the brush can be controlled After detection of the upper or lower side of the brushes, these brushes can for example be placed authomati- cally in the same direction, so that they are standing on the right position for further treatment With the detection of the difference between for example, a rough or worked or a smooth or flat surface, it can, by obtaining a maximum of detectable difference, be advisable in certain cases to direct the beam or stream of the medium under a certain angle, whereby the gas or liquid stream in connection with a smooth or flat surface is easier to be bended to make a minimum of waves, seen that the medium under a certain angle can easier maintain the coherent movement of the molecules and hereby will bend with only a minimum of waves and signal level With a certain deformation of the surface, the beam will, undependent if it is aimed under a certain angle on the deformed surface, reflect or wave on this, whereby a larger noice or sound signal difference will be obtained between a flat or deformed surface By testing, or by performing certain calculations, it can be determined what beam form and diameter and whatkind of medium need to be choosen to create a maximum usable detection signal In certain cases, it can be advisable to move one or more adapted beams over the detection surface of the object or to have moved the object in accordance with the detection device, whereby in function of the positions, it can be determined how a certain object is positionised, or on what places defaults can be detected, or what the roughnesses are of the investigated places As the created acoustical signals are aswell depending of the distance of the beam sent in accordance with the object that is beamed on, with a known surface condition of a brush, it can be determined, in function to the noice signal received, what distance there exists between the brush and the detector By shortly interrupting the beam or stream of the medium during the working or by activating it during a short time, it can aswell be controlled how long it takes before a collision of the medium with the surface to be detected is caused or disappairs, this to calculate the distance in function of the known stream velocity of the medium For the detection of the acoustical signals created, one or more fibrations receivers are used, that are so placed, so that they can receive the detection fibrations in the best way, whereby aswell one must pay attention to the different positions of the possible detection objects The fibration receivers are currently foreseen of a piezo-electncal element, that possesses the characteristic to be able to convert the noice fibrations in a usable electrical signal Aswell one has to pay attention to the fact that certain disturbing sounds that might exist in the area, influence the measurement as low as possible or that these disturbing signals are caused electronically by the converting of the signal received To suppress the disturbing signals at a maximum, the one or more fibration receivers used can be foreseen of a acoustical filter, existing out of certain materials, that absorb certain fibrations of certain frequencies, or the dirturbing signals can be filtered by electronical way Aswell it is possible between two detections, to register the signals of between times sound fibrations by a same fibration receiver or other therefore foreseen fibration receivers, so that this can be taken into account by the filtering of the disturbing signals If the detection system is intregrated in a machine process, there exists aswell the possibilty to make a recor ding before of all surrounding fibrations or sounds, so that a picture of the side or disturbing fibrations can be made, whereby these registered side fibrations can be taken into account for the processing of the signal received during the real detection of the objects during the normal production process If an brush passes the detector, it is aswell possible to control the presence or not of an brush, aswell as to determine the time when the brush is passed, aswell to determine as to the noice signal received which brush is passed or on what distance, or to control if an brush in passing in the right direction, aswell to control the velocity or lenght of the brush, depending of the time duration of the detection signal received in function to the known transport or transplantation velocity of the brush or detector device If certain brushes need to be controlled over larger distances, it is possible that by using a gas beam as medium, this diverses in such a way, that on a certain distance no directed beam can reach the detection object or detection surface, or it is so weak, that no longer an usable signal can be created If the circumstances of the detection permit it, instead of a gas beam, one can use aswell a liquid beam or a combination of both The fibration receivers or receivers can be placed in such a way, that the sounds, that are created when the liquid is touching the detection surface through the surrrounding air, can reach the fibration receivers On the other side, it is aswell possible, that a fibration receiver is placed in the liquid stream itself, whereby the fibration created reach the receiver through the liquid column A combination of both positions is aswell possible If on the height of the brush the space is so restricted, that a detector cannot be placed in its total, there exist the possib ty to set up flat that part that creates the beaming of the detection surface, on a certain distance of the detection surface that needs to be controlled and by adding the air or liquid beam through a long fine tube, flexibel or not and foreseen or not of an endpart that is aimed towards the detection place Aswell the noice signal created or acoustical signal on the detection place can be transported or transferred through a conductor towards the fibration receiver, for example through a hollow tube or through a metal or other conductor that has the quality to be able to transplant sound waves over a larger distance, that aswell can be compaired with the function of a stethoscop This sound conductor can be foreseen of an acoustical protection mantle, so that this doens't carry with non or only few disturbing acoustical signals out of its environment Before the acoustical fibration transformer, on the hight of the object to be controlled, this conductor can aswell be foreseen with a miniatur parabolical dish, so that the acoustical signals are received concentrated and sent towards the acoustical fibration transformer By using a parabolical dish, aswell the surrounding sounds can be eliminated as much as possible on the place of the detection field, seen that the form of the dish is such, that in particular the acoustical sounds, that strike perpendicularly from the detection place against the dish, will be reflected in the centre of the dish Aswell it is possible, if the room permits this, to install the detection element in the centre of the parabolical dish itself, that will transform the fibrations directly to an electrical signal, that is sent for its further processing to an Electrical conductor To be able to protect the detection element that detects the acoustical fibrations against dirt, such as dust parts one can use a sieve or membram, or by means of a light over pressure, for example, by means of a pressed air connection, a small amount of air is sent through or along the detection element, so that no filthiness can enter inside the detection element, for as such that the nature of filthiness can influence negatively the detection system The advantages of the invention are characterized by a contactless and reliable controlling of the detection of the roughness and/or irregularities and/or measurements and/or positions of a certain surface of brushes, whereby the brush is not damaged Moreover, aswell transparant objects can be controlled, seen that the medium does not make any distinction between colours or light transmission In comparison with traditional ultrasonical detectors, a very limited surface can be controlled on a minimum distance In contradiction to the optical systems, this system is resistent against dust filthiness or other uncleanness On the height of the detection place, it is possible to make the detection part of the detector very small Seen that the detection system does not emit ultrasonical signals, that can be reflected on a larger surface, it makes possible to create a detection signal that only exists on the place of the surface that is shined upon by the medium In drawing 1 there is given a detection example of a position control of brushes, whereby in the given example a brush (1 ) is shown whereby a distinction is detected between a surface foreseen with drillings (19) and a surface without drillings (20), whereby the brushes through an authomatical driving system are positionised each time before the detection system, whereby over a certain distance, the gas medium, that is added through the entry (10) of the pressure adjustment unit (7) and is filtered through filter (9) of the pressure adjustment unit (7) and on a right pressure is adjusted through the switch (8), whereby the medium through the conductors (2) and (3) are sent towards the detection places (19) and (20) to the upper and lower part of the brush (1 ), whereby by collision of the medium (4) and (5) with the detection surfaces (19) and (20) will hereby along the side (19) where the drillings are foreseen, the medium (4) will start whirling and so will create an acoustical signal, whereby the acoustical signal created, is sent through the surface with drilling and via the parabolical dish (11 ) and a smaller till non acoustical signal is sent through the surface without drilling through the dish (12) and the sound transmitters (13) and (14) over a certain distance to the receivers (15) and (16), whereby in function of the acoustical signal received, that is processed in the drive unit (17) and sent towards the machine in a usable switching signal, that indicates of these brush stick is put into the right direction and if it needs to be turned or not, whereby each brush (1 ) can be put in the same direction, so that they can be processed further in the fabrication To avoid that the noice signals that are caused by the whirling of the medium (4) on the place of the drillings (19) are received by the parabolical dish (12) on the other side of the brush and are detected by the detector (15), an electrical switchable 3/2 valve (6) is added, whereby the medium that is sent via channel (21 ) through this valve (6), lets stream the medium alternatively through the channel (2) and (3), so that never on the same time the two medium streams are working together on both detection surfaces

Claims: CLAIMS 1 The invention foresees in a detection system that can detect the specifications of surface(s) of brushes, or can distinguish between several surface conditions of certain brushes whereby the surface conditions are determined by the presence or not of unregulanties or deformations or roughnesses or certain dimensions or forms of the surfaces, which can create a detectable signal by the detection system, whereby to generate the 5 detection signal, the detections system makes use of a medium, that is sent with a certain velocity to the surface to be detected, whereby depending of the specifications of the surface shone upon, whirls are created or not, that generate a certain acoustical signal that can be described as a noice signal, whereby this noice signal can be received by one or more foreseen fibrations receivers, whereby these fibration receivers possess the quality to convert this noice signal caused in a usable electrical signal so it can be determined 0 what the roughness is of a certain brush surface or changes in or on the brush surface or it can be determined on certain moments if the brush surface is present or not or is in position before the detection system or to determine the forms of the brush surface or to select certain brushes with a certain surface condition or form or surface faults or to determine the moving velocity of the brush surface in accordance with the detection system 2 - Appliance as to conclusion 1 , hereby characterized, that as medium a gas is used 15 3 - Appliance as to conclusion 1 and 2, hereby characterized, that as medium aswell a liquid can be used 4 - Appliance as to conclusions 1 till 3, hereby characterized, that the gaseous medium aswell can contain a certain liquid or moisture percentage 5 - Appliance as to conclusions 1 till 4, hereby characterized, that the medium used is sent with a certain Velocity to the surface to be detected 0 6 - Appliance as to conclusions 1 till 5, hereby characterized, that the medium used is sent in beam form to the detection surface whereby the form of the beam depends of the form and dimensions of the conduction tube or opening through which the medium is streaming 7 - Appliance as to conclusions 1 till 6, hereby characterised, that the medium can aswell be transported over a larger distance an extention or pipe (2) and (3) to the detection place(s) 25 8 Appliance as to conclusions 1 till 7, hereby charatenzed, that the medium is sent under a certain angle to the detection place 9 - Appliance as to conclusions 1 till 8, hereby characterized, that the beam angle or position of the medium that is sent with a certain velocity to the detection place, can be altered during or between each detection execution 30 10 Appliance as to conclusions 1 till 9, hereby characterized, that several beams can be applied for the beaming of the detection place 11 Appliance as to conclusions 1 till 10, hereby characterized, that by application of several beams of the medium, these beams can vary mutually as to the velocity, form and composition of the kind of medium that is applied 35 12 Appliance as to conclusions 1 till 11 , hereby characterized, that by using several beams of the medium, these are sent at the same time or alternatively to the one or more detection surfaces, according to a fixed or changing steaπng programm or not 13 Appliance as to conclusions 1 till 12, hereby characterized, that due to the beaming of the detection surface(s) there are created whirls or not, that produce a certain acoustical signal, whereby depending of the 40 form of the surface beamed on, a undefinable unordered composition of several sound frequencies is created aswell called noice signal 14 Appliance as to conclusions 1 till 13, hereby characterized, that for the reception of the acoustical noice signals a piezo-electπcal element is used, or another element, that possesses the quality to convert the Acoustical signals or fibrations or fibration waves in an electrical signal 15 Appliance as to conclusions 1 till 14, hereby characterized, that the fibration receiving element or fibration- receiver, can be foreseen of an acoustical filter that can filter or decrease certain sound signals, that can cause 5 a disturbing influence on the detection performance 16 Appliance as to conclusions 1 till 15, hereby characterized, that the noice signals received, which can influence disadvantuously the detection performance, can be eliminated or decreased through electronical filtration 17 Appliance as to conclusions 1 till 16, hereby characterized, that the noice signals received, which can 10 influence disadvantuously the detection performance, can be detected or received during, before or after each detection by a same or specially herefore foreseen fibrations receivers, so to be electronically eliminated in total or in part or that by each detection result the signals received are taken into account 18 Appliance as to conclusions 1 till 17, hereby characterized, that the acoustical fibrations received on the height of the detection place (19) and (20), can be transferred or transported over a certain distance through An 15 acoustical tube or conductor (13) and (14) towards the fibration detectors (15) and (16) 19 Appliance as to conclusions 1 till 18, hereby characterized, that the acoustical fibrations or noice signals, which are created on the detection place, through a parabolical dish (11 ) and (12) or other forms can receive or transfer the noice signals to the fibrations receivers (15) and (16) 20 Appliance as per conclusions 1 till 19, hereby characterized, that by using a fibration conductor (13) and 20 (14), that transfer the noice signals received over a longer distance that is foreseen of a acoustical protection coating, so that acoustical surrounding fibrations or disturbing fibrations can only for a minimum be taken with to the fibration receivers (15) and (16) through the fibration conductor 21 Appliance as per conclusions 1 till 20, hereby characterized, that the fibration receivers used can be foreseen of a filter screen or membrame, that avoid the enterπng of dust or other strange elements 25 22 Appliance as per conclusions 1 till 21 , hereby characterized, that the fibration receivers used are totally or partly installed in a partly closed area, in which an over pressure is created, so to avoid that unpunties can enter this room 23 Appliance as to conclusions 1 till 22, hereby characterized, that the gas or liquid medium used is filtered beforehand or disposed of dust partes or other unpunties, before the medium is sent to the detection surface 30 so that certain conduit-pipes cannot be narrowed or blocked, or that the detection surface cannot be dirtied 24 Appliance as to conclusions 1 till 23, hereby characterized, that the detection system during the detection performance can aswell detect a distinction between several materials, fabrics or material specifications according to the absorption capacity or fibration dimming capacity of these fabrics or materials in function to the noice signals created or received, that are created under influence of the medium in contact with certain 35 deformations or roughnesses or other surface conditions of the detection surfaces or places 25 Appliance as per conclusions 1 till 24, hereby characterized, that the detection system that is applied for the detecting of surface roughnesses, or aswell surface formations or measurements or the presence or not of brushes or displacement velocities of brushes or tools or material compositions or specifications, can aswell be applied for the position control of brushes whereby in the given example of brush(1) is presented whereby a 40 difference is detected between a surface foreseen with drillings (19) and a surface without drillings (29), whereby the brushes through an automatic driving system are positioned each time before the detection system, whereby over a larger distance a gas medium, that is supplied through the entrance (10) of the pressure adjusting unit (7) and filtered through filter (9) of this pressure adjusting unit (7) and is tuned in at exact pressure by switch (8) whereby the gas medium through the conductors (2) and (3) is sent to the detection places (19) and (20) on the upper and lower side of the brush (1 ), whereby by collision of the medium (4) and (5) with the detection surfaces (19) and (20), the hereby created acoustical signal is sent through the parabolical dishes (11 ) and (12) and sound carriers (13) and (14) over a certain distance towards the receivers (15) and (16), whereby in function to the acoustical signal received, that is caused in the steanng unit (17) and transferred to the machine in a usable switch signal, it is automatically determined if the brushes need to be turned over or not, so that each brush (1 ) is put in the same direction so that the fabrication can be processed on AMENDED CLAIMS [received by the International Bureau on 03 June 1998(03.06.98); original claims 1-25 replaced by amended claims 1-15 (2 pages)] 1. The invention foresees in a detection system for the detection of holes or cavities in brush surfaces, with the general characteristic that, to generate the detection signal, the detections system makes use of a gas or liquid medium, that is transported without interruption through a channel till the place of detection and whereby the stream is put into contact with a certain velocity with the brush surface to be detected, whereby depending of 5 the specifications of the brush surface shone upon, whirls are created or not, that generate a certain acoustical signal that can be described as a noice signal, whereby a noice signal or not is created, free of resonance or standing sound waves, whereby this noice signal can be received by one or more foreseen fibration receivers, and transformed in an usable electrical signal without using a frequency or spectrum analyser, seen that the noice signal level or signal level is determined for the connection of the detector or not. 0 2.- Appliance as to conclusion 2, hereby characterized, that the medium can be transported over a larger distance through an extention or pipe (2) and (3) towards the detection place(s). 3. Appliance as to conclusions 1 till 2, hereby characterized, that the medium is sent under a certain angle to the detection place. 4.- Appliance as to conclusions 1 till 3, hereby characterized, that the beam angle or position of the medium 5 that is sent with a certain velocity to the detection place, can be altered during or between each detection execution. 5.- Appliance as to conclusions 1 till 4, hereby characterized, that several beams of the medium can be applied for the beaming of the detection place. 6.- Appliance as to conclusions 1 till 5, hereby characterized, that by application of several beams of the 0 medium, these beams can vary mutually as to the velocity, form and composition of the kind of medium that is applied. 7.- Appliance as to conclusions 1 till 6, hereby characterized, that by using several beams of the medium, these are sent at the same time or alternatively to the one or more detection surfaces, according to a fixed or changing stearing programme or not. 5 8.- Appliance as to conclusions 1 till 7, hereby characterized, that for the reception of the acoustical noice signals a piezo-electrical element is used, or another element, that possesses the quality to convert the acoustical signals or fibrations or fibration waves in an electrical signal. 9.- Appliance as to conclusions 1 till 8, hereby characterized, that the fibration receiving element or fibration receiver, can be foreseen of an acoustical filter that can filter or decrease certain sound signals, that can cause 30 a disturbing influence on the detection performance. 10.- Appliance as to conclusions 1 till 9, hereby characterized, that the noice signals received, that are created outside the detection zone and can influence disadvantuously the detection performance, can be detected or received during, before or after each detection by a same or specially herefore foreseen fibrations receivers, so to be electronically eliminated in total or in part. 35 11.- Appliance as to conclusions 1 till 10, hereby characterized, that the acoustical fibrations received on the height of the detection place (19) and (20), can be transferred or transported over a certain distance through an acoustical tube or conductor (13) and (14) towards the fibration detectors (15) and (16). 12.- Appliance as to conclusions 1 till 11 , hereby characterized, that the acoustical fibrations or noice signals, which are created on the detection place, through a parabolical dish (11) and (12) can receive or transfer the noice signals to the fibrations receivers (15) and (16). 13.- Appliance as per conclusions 1 till 12, hereby characterized, that by using a fibration conductor (13) and (14), that transfer the noice signals received over a longer distance that is foreseen of a acoustical protection coating, so that acoustical surrounding fibrations or disturbing fibrations can only for a minimum be taken with to the fibration receivers (15) and (16) through the fibration conductor. 14.- Appliance as per conclusions 1 till 13, hereby characterized, that the fibration receivers used can be foreseen of a filter screen or membrane, that avoid the enterring of dust or other strange elements. 15.- Appliance as per conclusions 1 till 14, hereby characterized, that the detection system in given example will be applied for the position control of brushes whereby a brush(1) is presented whereby a difference is detected between a surface foreseen with drillings (19) and a surface without drillings (20), whereby the brushes through an automatic driving system are positioned each time before the detection system, whereby over a larger distance a gas medium, that is supplied through the entrance (10) of the pressure adjusting unit (7) and filtered through filter (9) and through a pressure adjusting unit (7) is tuned in at exact pressure by switch (8) whereby the gas medium through the conductors (2) and (3) is sent to the detection places (19) and (20) on the upper and lower side of the brush (1), whereby by collision of the medium (4) and (5) with the detection surfaces (19) and (20), the hereby created acoustical signal is sent through the parabolical dishes (11) and (12) and sound carriers (13) and (14) over a certain distance towards the receivers (15) and (16), whereby in function to the noice signal level received, that is caused in the stearing unit (17) and transferred to the machine in an usable switch signal, and authomatical control is made on faulty supplied brushed that need to be turned over or not by a foreseen installation, so that each brush (1) is put in the same direction so that the fabrication can be processed on, such as inplanting of brush hairs.

Inventors: DE RIJCK SIMONNE, DE RIJCK, SIMONNE
Applicants: RIJCK SIMONNE DE, DE RIJCK, SIMONNE
Application year: 1997
Main classification: G01B13
IPC codes: G01B13, G01B17