EP0255433B1 - Portable pneumatic machine with an electronic control system - Google Patents

Portable pneumatic machine with an electronic control system Download PDF

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Publication number
EP0255433B1
EP0255433B1 EP87401739A EP87401739A EP0255433B1 EP 0255433 B1 EP0255433 B1 EP 0255433B1 EP 87401739 A EP87401739 A EP 87401739A EP 87401739 A EP87401739 A EP 87401739A EP 0255433 B1 EP0255433 B1 EP 0255433B1
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EP
European Patent Office
Prior art keywords
machine
torque
pneumatic
set value
tool
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EP87401739A
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German (de)
French (fr)
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EP0255433A1 (en
Inventor
Claude Dupin
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D'exploitation Ffdm Pneumat Ste
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D'exploitation Ffdm Pneumat Ste
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Priority to AT87401739T priority Critical patent/ATE57123T1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B21/00—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
    • B25B23/14—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers
    • B25B23/145—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for fluid operated wrenches or screwdrivers
    • B25B23/1456—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for fluid operated wrenches or screwdrivers having electrical components

Definitions

  • the present invention relates to portable pneumatic machines of the type comprising a body provided with a compressed air supply duct, pneumatic rotary motor means (turbine or vane motor for example) placed in the body, actuated by the flow of compressed air intended to rotate a tool, a device for regulating or cutting off the air flow supplying the machine and an electric generator comprising a rotor and a stator installed in the body.
  • the rotor is capable of being mechanically driven in rotation by the motor means and allows the creation of electrical energy from the pneumatic driving energy of the tool.
  • the invention finds a particularly important, although not exclusive, application in the particular case of screwdrivers, drills, tappers, and portable pneumatic grinders.
  • Document GB-A 1,211,133 shows a pneumatic machine with an electronic circuit.
  • Said electronic circuit consists of a comparator between the signal supplied by an output torque sensor and a set value and it controls an electromagnetic clutch interposed between the rotary motor means and the torque sensor.
  • Such an arrangement requires a clutch and a torque sensor, which are complex.
  • Document FR-A-2 523 891 concerning a rotary penumatic machine with incorporated lighting shows a machine, which conforms to the preamble of claim 1, comprising a rotary member driven in rotation by a mechanism enclosed in a casing and moved by 'pressurized air.
  • the casing provided for this purpose with means of connection to a source of compressed air, comprises an electric generator with rotor and stator, the rotor of which is driven by the compressed air supplying the mechanism of the machine.
  • This rotor is enclosed in a housing which can be secured to the casing.
  • the generator supplies lighting means carried by the housing and which allow the machine to work in places of difficult access, where the use of a portable lamp is impossible.
  • This machine is, however, of only limited interest.
  • the invention proposes in particular a portable pneumatic machine of the kind defined above, in accordance with the characterizing part of claim 1.
  • An advantageous embodiment of the machine comprises an electric generator which supplies a signal representative of the speed of rotation of the motor means.
  • the electronic command and control circuit of the machine has means for selecting a set value for this speed and means for maintaining said speed at this set value.
  • Another advantageous device presents a pneumatic machine, the electric generator of which delivers a signal representative of the angular position of the rotary motor means and of the tool.
  • the electronic command and control circuit of the machine comprises means for selecting a set value for the angular position and means for stopping the motor means when the tool reaches this value.
  • Another advantageous pneumatic machine is characterized in that the air cut-off device supplying the machine is integrated into the body of said machine and comprises means capable of transmitting a signal representative of the torque exerted by the rotary motor means to the electronic control circuit. and control.
  • the electronic circuit includes means for selecting a set value at a maximum torque of the output shaft of the machine. When the torque has reached the setpoint, the air is cut off.
  • the electronic circuit further comprises means suitable for measuring the increase in torque during tightening as a function of time or of the angular position of the driving means, means suitable for comparing (as a function of the foreseeable shape of the anticipated curve from the slope of the increase in torque that we have just measured) the value of the torque at a reference time t o with the set value and deduce the remaining tightening time or the angle a to turn remaining, in order to precisely stop the machine at its set value, and means for activating a timer or a tachometer to from this instant t o suitable for stopping said machine when said tightening time or said angle to be turned has elapsed.
  • elastic means are provided connected between the rotary motor means and the spindle on which the tool is fixed. These means make it possible to increase the torque rise time and thus improve the tightening precision. They have a reducing role which is diminishing. They are for example constituted by a spring operating in torsion or in compression, or are constituted by an elastic material, plastic or others. These elastic means are known per se.
  • the means capable of transmitting a signal representative of the torque exerted by the rotary motor means comprise a deformable part capable of immobilizing the motor means in rotation and supporting at least one sensor.
  • the latter may be of the strain gauge type, or of the piezoelectric pressure sensor type or the like.
  • FIG. 1 shows a hand-held screwdriver with incorporated controls of the output torque of the machine and of the tightening angle of the tool adaptable to the spindle of the screwdriver produced according to the invention.
  • It comprises a body 1 which may be made of hard plastic or metal or any other suitable material.
  • a compressed air supply duct 2 makes it possible to supply the machine and to drive a vane motor 3 in rotation.
  • This vane motor 3 drives via a reduction gear 4 and a return of angle 5, the tool (not shown).
  • the reducer is, for example, of the epicyclic type.
  • the geared motor assembly 3, 4 is mounted to rotate freely in the body 1 held manually by an operator.
  • An electric generator 6 comprising a rotor 7 and a stator 8 is made integral with the axis 9 of the vane motor 3 suitable for mechanically rotating the rotor 7.
  • An air cut-off device 10 comprises a closing valve 11, an electromagnet 12 capable of being actuated by an electronic circuit 13 for controlling and controlling the operation of the pneumatic machine.
  • the circuit 13 is incorporated into the body 1 and supplied with current delivered by the electric generator 6.
  • the latter is arranged to deliver signals representative of at least one operating parameter usable by the circuit 13.
  • a manual control 12a (represented in the form of a push button in FIG. 1) makes it possible to open a supply valve 61 for compressed air, placed before the valve 11, on the air inlet 2. This control can also, for example, be provided under form of a lever 42 (see FIG. 2).
  • valve 11 is closed in the rest position and the manual control 12a will ensure its opening without additional supply valve 61.
  • FIG. 3 shows a block diagram for command and control of an electronic circuit 13 according to the invention, supplied by the incorporated electric generator.
  • the electric generator 20 supplies a voltage rectifier 23 and also directly delivers signals representative of the operating parameters of the machine via a voltage digitizer 21 and a pulse counter 22.
  • the voltage rectifier 23 is connected to a battery 24 of accumulators integrated in the body 1 of the machine, placed for example near the duct 2 for supplying compressed air to the machine (see fig. 1).
  • the battery 24 makes it possible, by means of stabilized supply means 25, to supply electricity to force sensors 26. These can be strain gauges, or even pressure sensors of the piezo type. electric or other. These sensors are fixed on a deformable support part 15, suitable for immobilizing the vane motor 3 and its associated reduction gear 4 in rotation. They are connected to the electronic circuit for controlling and controlling the operation of the machine and are capable of supplying a signal representative of the torque exerted by the turbine 3 on the deformable part via a voltage amplifier 27.
  • This voltage amplifier 27 supplies means 28 for displaying the torque.
  • a computer 29 or a threshold detector 30 the amplifier 27 attacks the electromagnet 13 making it possible to open or close the valve 11.
  • means 60 for memorizing the operating parameters are connected to the electronic circuit, for example to the digitalizer 21, to the voltage amplifier 27 and / or to the computer 29. These means, carried by the machine body can be included in a detachable body housing.
  • Figure 2 shows an electronic speed regulation grinder according to the invention. It comprises a body 40, a compressed air supply connection 41 which can for example be of the quick coupling type and a manual control 42 shown in the figure in the form of a lever, but which can be a button, or any other known means.
  • a solenoid valve 43 provided with a needle screw 44 controlled by a micro-motor 51 supplied by the electric generator, makes it possible to control the flow of compressed air supply to the vane motor 45 which causes the rotation of the spindle 46 on which comes to fix the tool (not shown).
  • this solenoid valve 43 is controlled by means of the electronic circuit 47 of the type comprising at least part of the elements of FIG. 3.
  • the information on the rotation of the spindle 46 is given to the electronics from. the output of the electric generator 20.
  • the voltage digitizer 21 makes it possible to supply a signal representative of the speed of rotation of the spindle during operation to means for displaying the speed 33.
  • a clock 34, supplied or not by the generator, and the pulse counter 22 connected to the output of the generator 20 are connected to means 35 for maintaining a speed regulation setpoint selected by means 35a and are capable of acting on the valve 43 to modulate the air supply.
  • the speed of the machine can then be modified in a determined direction, after comparison of the speed measured with a reference speed given in reference to the electronics by the selection means 35a.
  • the pulse counter 22 also makes it possible to deliver signals representative of the angles of rotation of the output pin. Via the computer 29 it attacks the electromagnet 13. This computer 29 is connected to means for selecting a set value 29a of the desired angle of rotation and can be connected to display means 29b from this angle. Thus, the machine is stopped when the measured angle of rotation becomes equal to a value given by the reference means 29a.
  • the electronic circuit 13 may include measuring means 70, 71 suitable for measuring the increase in the value of the torque. during tightening either as a function of time, then for example supplied by the clock 34 (connection not shown in FIG. 3), or as a function of the angular position of the rotary motor means given by the pulse counter 22 (connection not shown in Figure 3).
  • the circuit 13 also includes calculating means 72 connected to the means for selecting a set value 31 and to the measuring means 70, 71, said means being suitable for calculating as a function of the past shape of the increase curve of the couple the predictable form of this increase and deduce from it from a reference time t o or from a reference angle ⁇ o the tightening time t or the tightening angle a to turn remaining necessary to reach the value setpoint (torque or tightening angle).
  • calculating means 72 connected to the means for selecting a set value 31 and to the measuring means 70, 71, said means being suitable for calculating as a function of the past shape of the increase curve of the couple the predictable form of this increase and deduce from it from a reference time t o or from a reference angle ⁇ o the tightening time t or the tightening angle a to turn remaining necessary to reach the value setpoint (torque or tightening angle).
  • elastic means 5a can be added, for example inside the body of the machine near the bevel gear 5 as shown diagrammatically in FIG. 1.
  • Such elastic means allow a differential rotation between the part 9a of the shaft 9 rigidly connected to the rotary motor means and the part 9b rigidly connected to the tool via the pin 16.
  • These elastic means allow a reduction with damping which results in increasing the torque build-up time and therefore improving the tightening pressure.
  • control and command circuit of a pneumatic machine can advantageously be added to this control and command circuit of a pneumatic machine according to the invention.
  • a system 50 allowing the programming of the tightening duration in the case where the machine is a screwdriver. It is also possible, by means of a speed change device 52, to modify the operating parameters of the machine for example to have a different working speed.
  • Compressed air is connected to the machine by adapting a connection to the compressed air supply pipe 2.
  • the tool is then stopped.
  • the compressed air supplies the rotary motor means 3, 45 driving the reducer 4 which makes turn the spindle 16, 46 on which the tool is fitted.
  • the rotary means 3 drive the current generator 6, which after having been transformed, is stored, for example, in the battery 24 which is used for the general supply of the control-command circuit.
  • the operator In the case of the operation of a grinder-type machine, the operator displays the speed at which he wants to carry out his grinding operation by means 35a of selecting a set value.
  • the surface condition of the workpiece, the manual pressure exerted by the operator, and the condition of the tool will vary.
  • the speed of rotation which is a function of these parameters, will therefore also vary and will then make it possible to regulate the air intake by acting through the regulating means 35 on the needle valve 44 as previously described, by action on the micro- motor 51.

Abstract

A portable pneumatic machine is provided including an incorporated electronic circuit for controlling and monitoring the operation, which circuit is fed with current delivered by an electric generator rotated by the driving pneumatic air, the electric generator having means for delivering signals representative of at least one operating parameter of the machine usable by the incorporated electronic control and monitoring circuit.

Description

La présente invention concerne des machines pneumatiques portatives du type comportant un corps muni d'un conduit d'amenée d'air comprimé, des moyens moteurs rotatifs pneumatiques (turbine ou moteur à palette par exemple) placés dans le corps, actionnés par le flux d'air comprimé et destinés à entraîner en rotation un outil, un dispositif de régulation ou de coupure du flux d'air alimentant la machine et un générateur électrique comprenant un rotor et un stator installés dans le corps. Le rotor est apte à être entraîné mécaniquement en rotation par les moyens moteurs et permet la création d'énergie électrique à partir de l'énergie pneumatique motrice de l'outil.The present invention relates to portable pneumatic machines of the type comprising a body provided with a compressed air supply duct, pneumatic rotary motor means (turbine or vane motor for example) placed in the body, actuated by the flow of compressed air intended to rotate a tool, a device for regulating or cutting off the air flow supplying the machine and an electric generator comprising a rotor and a stator installed in the body. The rotor is capable of being mechanically driven in rotation by the motor means and allows the creation of electrical energy from the pneumatic driving energy of the tool.

L'invention trouve une application particulièrement importante, bien que non exclusive, dans le cas particulier des visseuses, perceuses, taraudeuses, et meuleuses pneumatiques portatives.The invention finds a particularly important, although not exclusive, application in the particular case of screwdrivers, drills, tappers, and portable pneumatic grinders.

On connait déjà des machines pneumatiques du type ci-dessus défini. Le document GB-A 1 211 133 montre une machine pneumatique avec un circuit électronique. Ledit circuit éléctronique est constitué par un comparateur entre le signal fourni par un capteur de couple de sortie et une valeur de consigne et il commande un embrayage électromagnétique interposé entre les moyens moteurs rotatifs et le capteur de couple. Une telle disposition exige un embrayage et un capteur de couple, qui sont complexes.Pneumatic machines of the type defined above are already known. Document GB-A 1,211,133 shows a pneumatic machine with an electronic circuit. Said electronic circuit consists of a comparator between the signal supplied by an output torque sensor and a set value and it controls an electromagnetic clutch interposed between the rotary motor means and the torque sensor. Such an arrangement requires a clutch and a torque sensor, which are complex.

Le document FR-A-2 523 891 concernant une machine penumatique rotative à éclairage incorporé, montre une machine, qui conforme au préambule de la revendication 1, comportant un organe rotatif entraîné en rotation par un mécanisme enfermé dans un carter et mû par de l'air comprimé. Le carter, muni à cet effet de moyens de connexion à une source d'air comprimé, comporte un générateur électrique à rotor et stator, dont le rotor est entraîné par l'air comprimé alimentant le mécanisme de la machine. Ce rotor est enfermé dans un boîtier solidarisable du carter. Le générateur alimente des moyens d'éclairage portés par le boîtier et qui permettent à la machine de travailler dans des endroits d'accès difficile, où l'emploi d'une lampe baladeuse est impossible. Cette machine ne présente néanmoins qu'un intérêt limité.Document FR-A-2 523 891 concerning a rotary penumatic machine with incorporated lighting, shows a machine, which conforms to the preamble of claim 1, comprising a rotary member driven in rotation by a mechanism enclosed in a casing and moved by 'pressurized air. The casing, provided for this purpose with means of connection to a source of compressed air, comprises an electric generator with rotor and stator, the rotor of which is driven by the compressed air supplying the mechanism of the machine. This rotor is enclosed in a housing which can be secured to the casing. The generator supplies lighting means carried by the housing and which allow the machine to work in places of difficult access, where the use of a portable lamp is impossible. This machine is, however, of only limited interest.

La présente invention vise à fournir une machine pneumatique portative répondant mieux que celles antérieurement connues aux exigences de la pratique, notamment en ce qu'elle permet:

  • - Une commande et un contrôle des paramètres du fonctionnement de la machine qui ne nécessitent pas d'alimenter celle-ci par une énergie autre que celle fournie par l'air comprimé moteur ; On évite ainsi l'encombrement de fils supplémentaires qui risquent de plus de se sectionner avec les éventuels problèmes de sécurité que cela peut poser ;
  • - Une commande et un contrôle de la machine, peu coûteux, n'augmentant pas sensiblement l'encombrement de cette dernière, qui reste ainsi très maniable;
  • - La réalisation d'un grand nombre de fonctions jusqu'àlors peu exploitées par les constructeurs du fait des difficultés rencontrées dans leur mise en oeuvre. Les systèmes intégrés mécaniques, tels que limiteurs de couple, régulateur de pression et de vitesse, sont en effet complexes et ont des performances et des possibilités limitées. La machine pneumatique portative selon l'invention va notamment permettre une mesure et une régulation de la vitesse de rotation de l'outil, le serrage par l'outil à un couple et un angle prédéterminé et de nombreuses autres fonctions comme il sers décrit plus loin, sans nécessiter d'armoire électrique extérieure d'encombrement et de coût élevé.
The present invention aims to provide a portable pneumatic machine which meets the requirements of practice better than those previously known, in particular in that it allows:
  • - A command and control of the parameters of the operation of the machine which do not require it to be supplied with energy other than that supplied by the compressed engine air; This avoids the clutter of additional wires which are more likely to cut with the possible security problems that this may pose;
  • - A command and control of the machine, inexpensive, not significantly increasing the size of the latter, which thus remains very manageable;
  • - The realization of a large number of functions hitherto little exploited by manufacturers due to the difficulties encountered in their implementation. Integrated mechanical systems, such as torque limiters, pressure and speed regulators, are indeed complex and have limited performance and possibilities. The portable pneumatic machine according to the invention will in particular allow measurement and regulation of the speed of rotation of the tool, tightening by the tool to a predetermined torque and angle and many other functions as described below. , without the need for an external electrical cabinet of bulk and high cost.

Dans ce but, l'invention propose notamment une machine pneumatique portative du genre ci-dessus défini, conforme à la partie caractérisante de la revendication 1.To this end, the invention proposes in particular a portable pneumatic machine of the kind defined above, in accordance with the characterizing part of claim 1.

Un mode de réalisation avantageux de la machine comporte un générateur électrique qui fournit un signal représentatif de la vitesse de rotation des moyens moteurs. Le circuit électronique de commande et de contrôle de la machine a des moyens de sélection d'une valeur de consigne de cettre vitesse et des moyens de maintien de ladite vitesse à cette valeur de consigne. Une application de ce mode de réalisation particulièrement interessante peut être faite aux meuleuses, ponçeuses et autres machines dont la vitesse de rotation est fonction de la pression exercée par l'opérateur sur le support à usiner.An advantageous embodiment of the machine comprises an electric generator which supplies a signal representative of the speed of rotation of the motor means. The electronic command and control circuit of the machine has means for selecting a set value for this speed and means for maintaining said speed at this set value. An application of this particularly interesting embodiment can be made to grinders, sanders and other machines whose speed of rotation is a function of the pressure exerted by the operator on the support to be machined.

Un autre dispositif avantageux présente une machine pneumatique dont le générateur électrique délivre un signal représentatif de la position angulaire des moyens moteurs rotatifs et de l'outil. Le circuit électronique de commande et de contrôle de la machine comprend des moyens de sélection d'une valeur de consigne de la position angulaire et des moyens d'arrêt des moyens moteurs lorsque l'outil atteint cette valeur. Cette disposition permet le vissage d'une vis sur un support d'élasticité variable. Une approche approximative permet de mettre en contact le support et la vis, cette dernière étant ensuite tournée d'un angle prédéterminé.Another advantageous device presents a pneumatic machine, the electric generator of which delivers a signal representative of the angular position of the rotary motor means and of the tool. The electronic command and control circuit of the machine comprises means for selecting a set value for the angular position and means for stopping the motor means when the tool reaches this value. This arrangement allows the screwing of a screw on a support of variable elasticity. An approximate approach allows the support to be brought into contact with the screw, the latter then being turned by a predetermined angle.

Une autre machine pneumatique avantageux est caractérisée en ce que le dispositif de coupure d'air alimentant la machine est intégré au corps de ladite machine et comprend des moyens aptes à transmettre un signal représentatif du couple exercé par les moyens moteurs rotatifs au circuit électronique de commande et de contrôle. Le circuit électronique comprend des moyens de sélection d'une valeur de consigne à un couple maximum de l'arbre de sortie de la machine. Lorsque le couple a atteint la valeur de consigne, l'air est coupé.Another advantageous pneumatic machine is characterized in that the air cut-off device supplying the machine is integrated into the body of said machine and comprises means capable of transmitting a signal representative of the torque exerted by the rotary motor means to the electronic control circuit. and control. The electronic circuit includes means for selecting a set value at a maximum torque of the output shaft of the machine. When the torque has reached the setpoint, the air is cut off.

Avantageusement, le circuit électronique comprend de plus des moyens propres à mesurer l'accroissement du couple pendant le serrage en fonction du temps ou de la position angulaire des moyens moteurs, des moyens propres à comparer (en fonction de la forme prévisible de la courbe anticipée à partir de la pente de l'accroissement du couple que l'on vient de mesurer) la valeur du couple à un instant de référence to avec la valeur de consigne et en déduire le temps de serrage restant ou l'angle a à tourner restant, afin d'arrêter précisément la machine à sa valeur de consigne, et des moyens d'activation d'une temporisation ou d'un compte-tours à partir de cet instant to propre à arrêter ladite machine lorsque ledit temps de serrage ou ledit angle a à tourner est écoulé.Advantageously, the electronic circuit further comprises means suitable for measuring the increase in torque during tightening as a function of time or of the angular position of the driving means, means suitable for comparing (as a function of the foreseeable shape of the anticipated curve from the slope of the increase in torque that we have just measured) the value of the torque at a reference time t o with the set value and deduce the remaining tightening time or the angle a to turn remaining, in order to precisely stop the machine at its set value, and means for activating a timer or a tachometer to from this instant t o suitable for stopping said machine when said tightening time or said angle to be turned has elapsed.

De telles dispositions permettent d'arrêter la machine avec une très grande précision. En effet, si la coupure d'air comprimé ne se fait qu'au moment où la valeur de consigne est atteinte, il existe ou peut exister un léger temps de latence avant l'arrêt définitif. Ceci entraîne le dépassement de la valeur de consigne.Such arrangements make it possible to stop the machine with very high precision. In fact, if the compressed air is cut off only when the set value is reached, there is or may be a slight lag time before the final shutdown. This causes the setpoint to be exceeded.

Avec des moyens permettant de déterminer les caractéristiques de la courbe de montée en couple en fonction du temps ou de l'angle donné par la génératrice et des moyens permettant d'en tenir compte pour arrêter la machine, on peut couper l'air avant d'atteindre la valeur de consigne et s'arrêter précisément sur cette dernière.With means making it possible to determine the characteristics of the torque rise curve as a function of the time or of the angle given by the generator and means making it possible to take it into account to stop the machine, it is possible to cut the air before d '' reach the setpoint and stop precisely on the latter.

Dans un autre mode de réalisation avantageux, on prévoit des moyens élastiques connectés entre les moyens moteurs rotatifs et la broche sur laquelle on vient fixer l'outil. Ces moyens permettent d'augmenter le temps de montée en couple et améliorent ainsi la précision de serrage. Ils ont un rôle démultiplicateur qui va en s'atténuant. Ils sont par exemple constitués par un ressort fonctionnant en torsion ou en compression, ou sont constitués par une matière élastique, en plastique ou autres. Ces moyens élastiques sont connus en soit.In another advantageous embodiment, elastic means are provided connected between the rotary motor means and the spindle on which the tool is fixed. These means make it possible to increase the torque rise time and thus improve the tightening precision. They have a reducing role which is diminishing. They are for example constituted by a spring operating in torsion or in compression, or are constituted by an elastic material, plastic or others. These elastic means are known per se.

Dans un mode de réalisation avantageux, les moyens aptes à transmettre un signal représentatif du couple exercé par les moyens moteurs rotatifs comprennent une pièce déformable propre à immobiliser en rotation les moyens moteurs et supportant au moins un capteur. Ce dernier peut être du type jauge de contrainte, ou encore du type capteur de pression piezo-électrique ou autre.In an advantageous embodiment, the means capable of transmitting a signal representative of the torque exerted by the rotary motor means comprise a deformable part capable of immobilizing the motor means in rotation and supporting at least one sensor. The latter may be of the strain gauge type, or of the piezoelectric pressure sensor type or the like.

On peut, par ailleurs, avoir recours à l'une des dispositions suivantes :

  • - des moyens de stockage de l'énergie électrique délivré par le générateur, telle qu'une batterie d'accumulateurs, du type cadmium nickel par exemple, sont intégrés au corps de la machine ;
  • - au moins un écran d'affichage permettant de visualiser les paramètres de fonctionnement et/ou de consigne de ladite machine est fixé sur le corps ;
  • - le circuit électronique de contrôle et de commande est programmable.
  • - des moyens de mémorisation des paramètres de fonctionnement de la machine sont connectés au circuit électronique de contrôle commande. Ils sont portés par le corps de la machine et peuvent être désolidarisables du corps, ce qui permet d'exploiter les résultats sans immobiliser pour autant la machine.
One can, moreover, have recourse to one of the following provisions:
  • - means for storing the electrical energy delivered by the generator, such as a storage battery, of the cadmium nickel type for example, are integrated into the body of the machine;
  • - At least one display screen for viewing the operating and / or setpoint parameters of said machine is fixed to the body;
  • - the electronic control and command circuit is programmable.
  • - means for memorizing the operating parameters of the machine are connected to the electronic control command circuit. They are carried by the machine body and can be detached from the body, which allows the results to be used without immobilizing the machine.

L'invention sera mieux comprise à la lecture de la description qui suit d'un mode particulier de réalisation donné à titre d'exemple non limitatif. La description, ainsi que celle d'une variante préférée, se réfère aux dessins qui l'accompagnent dans lesquels :

  • - La figure 1 est une vue en perspective partiellement en coupe, d'une machine selon l'invention, servant au vissage et permettant un contrôle du couple de serrage et de la position angulaire de l'outil ;
  • - La figure 1 a est une vue schématique, partielle et en coupe de la tête d'une machine de vissage de la figure 1.
  • - La figure 2 est une vue en perspective, partiellement en coupe, d'une variante préférée de l'invention permettant par exemple le meulage avec régulation de la vitesse ;
  • - La figure 3 est un bloc diagramme du circuit de contrôle et de commande de la machine pneumatique portative selon l'invention.
The invention will be better understood on reading the following description of a particular embodiment given by way of non-limiting example. The description, as well as that of a preferred variant, refers to the accompanying drawings in which:
  • - Figure 1 is a perspective view partially in section, of a machine according to the invention, used for screwing and allowing control of the tightening torque and the angular position of the tool;
  • - Figure 1a is a schematic, partial and sectional view of the head of a screwing machine of Figure 1.
  • - Figure 2 is a perspective view, partially in section, of a preferred variant of the invention allowing for example grinding with speed regulation;
  • - Figure 3 is a block diagram of the control and command circuit of the portable pneumatic machine according to the invention.

La figure 1 montre une visseuse à main avec contrôles incorporés du couple de sortie de la machine et de l'angle de serrage de l'outil adaptable à la broche de la visseuse réalisée selon l'invention. Elle comporte un corps 1 qui peut être en plastique dur ou métal ou tout autre matériau adéquat. Un conduit 2 d'amenée d'air comprimé permet d'alimenter la machine et d'entraîner en rotation une moteur à palette 3. Ce moteur à palette 3 entraîne par l'intermédiaire d'un réducteur 4 et d'un renvoi d'angle 5, l'outil (non représenté). Le réducteur est, par exemple, du type épicycloïdal.FIG. 1 shows a hand-held screwdriver with incorporated controls of the output torque of the machine and of the tightening angle of the tool adaptable to the spindle of the screwdriver produced according to the invention. It comprises a body 1 which may be made of hard plastic or metal or any other suitable material. A compressed air supply duct 2 makes it possible to supply the machine and to drive a vane motor 3 in rotation. This vane motor 3 drives via a reduction gear 4 and a return of angle 5, the tool (not shown). The reducer is, for example, of the epicyclic type.

L'ensemble moto-réducteur 3, 4, est monté libre en rotation dans le corps 1 tenu manuellement par un opérateur. Un générateur électrique 6 comprenant un rotor 7 et un stator 8 est rendu solidaire de l'axe 9 du moteur à palette 3 propre à entraîner mécaniquement en rotation le rotor 7. Un dispositif de coupure d'air 10 comprend un clapet de fermeture 11, un électro-aimant 12 apte à être actionné par un circuit électronique 13 de commande et de contrôle du fonctionnement de la machine pneumatique. Le circuit 13 est incorporé au corps 1 et alimenté en courant délivré par le générateur électrique 6. Ce dernier est agencé pour délivrer des signaux représentatifs d'au moins un paramètre de fonctionnement utilisable par le circuit 13. Une commande manuelle 12a (représentée sous forme d'un bouton poussoir dans la figure 1 ) permet d'ouvrir une vanne d'alimentation 61 en air comprimé, placée avant le clapet 11, sur l'arrivée d'air 2. Cette commande peut également et par exemple, se présenter sous forme d'un levier 42 (voir figure 2).The geared motor assembly 3, 4 is mounted to rotate freely in the body 1 held manually by an operator. An electric generator 6 comprising a rotor 7 and a stator 8 is made integral with the axis 9 of the vane motor 3 suitable for mechanically rotating the rotor 7. An air cut-off device 10 comprises a closing valve 11, an electromagnet 12 capable of being actuated by an electronic circuit 13 for controlling and controlling the operation of the pneumatic machine. The circuit 13 is incorporated into the body 1 and supplied with current delivered by the electric generator 6. The latter is arranged to deliver signals representative of at least one operating parameter usable by the circuit 13. A manual control 12a (represented in the form of a push button in FIG. 1) makes it possible to open a supply valve 61 for compressed air, placed before the valve 11, on the air inlet 2. This control can also, for example, be provided under form of a lever 42 (see FIG. 2).

Dans une variante, le clapet 11 est fermé en position de repos et la commande manuelle 12a assurera son ouverture sans vanne d'alimentation 61 supplémentaire.Alternatively, the valve 11 is closed in the rest position and the manual control 12a will ensure its opening without additional supply valve 61.

La figure 3 montre un bloc diagramme de commande et de contrôle d'un circuit électronique 13 selon l'invention, alimenté par le générateur électrique incorporé.FIG. 3 shows a block diagram for command and control of an electronic circuit 13 according to the invention, supplied by the incorporated electric generator.

Les éléments figurant dans ce bloc diagramme sont réalisés à l'aide de composants électroniques connus en soi, discrets ou sous forme de circuits intégrés. Ils ne nécessitent donc pas d'explications particulières.The elements appearing in this block diagram are produced using electronic components known per se, discrete or in the form of integrated circuits. They therefore do not require any particular explanation.

Le générateur électrique 20 alimente un redresseur de tension 23 et délivre également directement des signaux représentatifs des paramètres de fonctionnement de la machine par l'intermédiaire d'un digitaliseur de tension 21 et d'un compteur d'impulsions 22. Le redresseur de tension 23 est connecté à une batterie 24 d'accumulateurs intégrés au corps 1 de la machine, placée par exemple à proximité du conduit 2 d'amenée d'air comprimé de la machine (voir fig.1). La batterie 24 permet par l'intermédiaire de moyens d'alimentation stabilisée 25, de fournir de l'électricité à des capteurs d'effort 26. Ceux-ci peuvent être des jauges de contrainte, ou encore des capteurs de pression du type piezo-électrique ou autre. Ces capteurs sont fixés sur une pièce support 15 déformable, propre à immobiliser en rotation le moteur à palette 3 et son réducteur 4 associé. Ils sont raccordés au circuit électronique de commande et de contrôle du fonctionnement de la machine et sont aptes à fournir un signal représentatif du couple exercé par la turbine 3 sur la pièce déformable via un amplificateur de tension 27.The electric generator 20 supplies a voltage rectifier 23 and also directly delivers signals representative of the operating parameters of the machine via a voltage digitizer 21 and a pulse counter 22. The voltage rectifier 23 is connected to a battery 24 of accumulators integrated in the body 1 of the machine, placed for example near the duct 2 for supplying compressed air to the machine (see fig. 1). The battery 24 makes it possible, by means of stabilized supply means 25, to supply electricity to force sensors 26. These can be strain gauges, or even pressure sensors of the piezo type. electric or other. These sensors are fixed on a deformable support part 15, suitable for immobilizing the vane motor 3 and its associated reduction gear 4 in rotation. They are connected to the electronic circuit for controlling and controlling the operation of the machine and are capable of supplying a signal representative of the torque exerted by the turbine 3 on the deformable part via a voltage amplifier 27.

Cet amplificateur 27 de tension alimente des moyens de visualisation 28 du couple. Par l'intermé- deiaire d'un calculateur 29 ou d'un détecteur de seuil 30, l'amplificateur 27 attaque l' électro-aimant 13 permettant d'ouvrir ou de fermer le clapet 11. Le détecteur de seuil 30, connecté à des moyens 31 fournissant une valeur de consigne règlable (potentiomètre, clavier, ou tous moyens permettant d'introduire une donnée externe) et qui peuvent être raccordés à des moyens de visualisation 32 de la valeur de consigne, permet, en comparant avec l'information provenant de l'amplificateur de tension 27, de donner une instruction de commande à l'électro-aimant 12.This voltage amplifier 27 supplies means 28 for displaying the torque. By means of a computer 29 or a threshold detector 30, the amplifier 27 attacks the electromagnet 13 making it possible to open or close the valve 11. The threshold detector 30, connected to means 31 providing an adjustable set value (potentiometer, keyboard, or any means allowing the input of external data) and which can be connected to display means 32 of the set value, allows, by comparing with the information from the voltage amplifier 27, to give a control instruction to the electromagnet 12.

Ainsi, lorsque le capteur d'effort indique une valeur égale à la consigne du système asservi, une instruction de commande est donnée. Dans le cas d'une machine dont on veut limiter à une valeur maximum le couple appliqué à la broche de travail 16, il s'agit de la fermeture de l'arrivée d'air comprimé.Thus, when the force sensor indicates a value equal to the setpoint of the slave system, a control instruction is given. In the case of a machine for which it is desired to limit the torque applied to the working spindle 16 to a maximum value, this involves closing the compressed air supply.

Mais d'autres cas sont possibles, notamment lorsqu'on veut pratiquer un arrêt de l'outil dans une position angulaire déterminée à partir d'un précou- ple de serrage. Auquel cas l'instruction de commande attaque alors un circuit de temporisation (non représenté). Dans une variante avantageuse de la machine selon l'invention, des moyens 60 de mémorisation des paramètres de fonctionnement sont connectés au circuit électronique, par exemple au digi- talisateur 21, à l'amplificateur de tension 27 et/ou au calculateur 29. Ces moyens, portés par le corps de la machine peuvent être inclus dans un boîtier déso- lidarisable du corps.However, other cases are possible, in particular when it is desired to stop the tool in a determined angular position from a tightening torque. In which case the control instruction then attacks a timing circuit (not shown). In an advantageous variant of the machine according to the invention, means 60 for memorizing the operating parameters are connected to the electronic circuit, for example to the digitalizer 21, to the voltage amplifier 27 and / or to the computer 29. These means, carried by the machine body can be included in a detachable body housing.

La figure 2 montre une meuleuse à régulation de vitesse électronique selon l'invention. Elle comprend un corps 40, un raccord d'alimentation 41 en air comprimé qui peut par exemple être du type raccord rapide et une commande manuelle 42 représentée sur la figure sous forme d'un levier, mais qui peut être un bouton, ou tout autre moyen connu. Une électrovanne 43, munie d'une vis pointeau 44 commandée par un micro-moteur 51 alimenté par la génératrice électrique, permet de contrôler le débit d'alimentation en air comprimé du moteur à palette 45 qui entraîne la rotation de la broche 46 sur laquelle vient se fixer l'outil (non représenté).Figure 2 shows an electronic speed regulation grinder according to the invention. It comprises a body 40, a compressed air supply connection 41 which can for example be of the quick coupling type and a manual control 42 shown in the figure in the form of a lever, but which can be a button, or any other known means. A solenoid valve 43, provided with a needle screw 44 controlled by a micro-motor 51 supplied by the electric generator, makes it possible to control the flow of compressed air supply to the vane motor 45 which causes the rotation of the spindle 46 on which comes to fix the tool (not shown).

Le fonctionnement de cet électrovanne 43 est commandé par l'intermédiaire du circuit électronique 47 du type comprenant au moins une partie des éléments de la figure 3. Les informations sur la rotation de la broche 46 sont données à l'électronique à partir de. la sortie du générateur électrique 20. Le digitaliseur de tension 21, permet de fournir un signal représentatif de la vitesse de rotation de la broche en cours de fonctionnement à des moyens d'affichage de la vitesse 33. Une horloge 34, alimentée ou non par la génératrice, et le compteur d'impulsions 22 branché à la sortie du générateur 20 sont connectés à des moyens 35 de maintien à une valeur de consigne de régulation de la vitesse sélectionnée par des moyens 35a et sont aptes à agir sur la vanne 43 pour moduler l'arrivée d'air. La vitesse de la machine peut alors être modifiée dans un sens déterminé, après comparaison de la vitesse mesurée à une vitesse de référence donnée en consigne à l'électronique par les moyens de sélection 35a.The operation of this solenoid valve 43 is controlled by means of the electronic circuit 47 of the type comprising at least part of the elements of FIG. 3. The information on the rotation of the spindle 46 is given to the electronics from. the output of the electric generator 20. The voltage digitizer 21 makes it possible to supply a signal representative of the speed of rotation of the spindle during operation to means for displaying the speed 33. A clock 34, supplied or not by the generator, and the pulse counter 22 connected to the output of the generator 20 are connected to means 35 for maintaining a speed regulation setpoint selected by means 35a and are capable of acting on the valve 43 to modulate the air supply. The speed of the machine can then be modified in a determined direction, after comparison of the speed measured with a reference speed given in reference to the electronics by the selection means 35a.

Le compteur d'impulsion 22 permet également de délivrer des signaux représenatifs des angles de rotation de la broche de sortie. Par l'intermédiaire du calculateur 29 il attaque l'électro-aimant 13. Ce calculateur 29 est relié à des moyens de sélection d'une valeur de consigne 29a de l'angle de rotation recherché et peut être connecté à des moyens d'affichage 29b de cet angle. Ainsi, la machine est arrêtée lorsque l'angle de rotation mesuré devient égal à une valeur donnée par les moyens 29a de consigne.The pulse counter 22 also makes it possible to deliver signals representative of the angles of rotation of the output pin. Via the computer 29 it attacks the electromagnet 13. This computer 29 is connected to means for selecting a set value 29a of the desired angle of rotation and can be connected to display means 29b from this angle. Thus, the machine is stopped when the measured angle of rotation becomes equal to a value given by the reference means 29a.

Lors des essais de rélisation d'une machine selon l'invention, une précision de l'ordre du degré a pu être obtenue. L'outil tourne en effet très lentement lorsque l'on effectue une rotation angulaire déterminée de la broche ; le couple exercé étant par ailleurs suffisant, la coupure de l'air comprimé entraîne un arrêt quasi immédiat.During the tests of realizing a machine according to the invention, an accuracy of the order of a degree could be obtained. The tool indeed turns very slowly when a determined angular rotation of the spindle is carried out; the torque exerted being also sufficient, the cut off of the compressed air causes an almost immediate stop.

Afin d'obtenir un arrêt encore plus précis de l'outil, dans une position correspondant exactement à la valeur de consigne fixée, le circuit électronique 13 peut comprendre des moyens de mesure 70, 71 propres à mesurer l'accroissement de la valeur du couple pendant le serrage soit en fonction du temps, alors par exemple fourni par l'horloge 34 (liaison non montrée sur la figure 3), soit en fonction de la position angulaire des moyens moteurs rotatifs donnés par le compteur d'impulsion 22 (liaison non montrée sur la figure 3). Le circuit 13 comprend aussi des moyens de calcul 72 connectés aux moyens de sélection 31 d'une valeur de consigne et aux moyens de mesure 70, 71, lesdits moyens étant propres à calculer en fonction de la forme passée de la courbe d'accroissement du couple la forme prévisible de cet accroissement et d'en déduire à partir d'un temps de référence to ou d'un angle de référence αo le temps de serrage t ou l'angle de serrage a à tourner restant nécessaire pour atteindre la valeur de consigne (couple ou angle de serrage). De tels moyens pour mesurer et calculer sont connus en soi et l'homme du métier choisira parmi les circuits intégrés ou discrets du commerce les éléments nécessaires pour les réaliser.In order to obtain an even more precise stopping of the tool, in a position corresponding exactly to the set target value, the electronic circuit 13 may include measuring means 70, 71 suitable for measuring the increase in the value of the torque. during tightening either as a function of time, then for example supplied by the clock 34 (connection not shown in FIG. 3), or as a function of the angular position of the rotary motor means given by the pulse counter 22 (connection not shown in Figure 3). The circuit 13 also includes calculating means 72 connected to the means for selecting a set value 31 and to the measuring means 70, 71, said means being suitable for calculating as a function of the past shape of the increase curve of the couple the predictable form of this increase and deduce from it from a reference time t o or from a reference angle αo the tightening time t or the tightening angle a to turn remaining necessary to reach the value setpoint (torque or tightening angle). Such means for measuring and calculating are known per se and those skilled in the art will choose from the integrated or discrete circuits on the market the elements necessary to produce them.

Des moyens 74 pour couper l'alimentation en air comprimé après le temps t ou la rotation d'un angle g, connectés aux moyens de calcul 73, assurent in fine un arrêt précis à la valeur de consigne en agissant sur l'électro-aimant 12.Means 74 for cutting off the supply of compressed air after the time t or the rotation of an angle g, connected to the calculation means 73, ensure in fine a precise stop at the set point by acting on the electromagnet 12.

Afin d'améliorer encore la précision quant à l'arrêt à la bonne valeur de consigne, des moyens élastiques 5a peuvent être rajoutés, par exemple à l'intérieur du corps de la machine à proximité du renvoi d';angle 5 comme montré schématiquement sur la figure 1. De tels moyens élastiques permettent une rotation dfférentielle entre la partie 9a de l'arbre 9 rigidement reliée aux moyens moteurs rotatifs et la partie 9b rigidement reliée à l'outil via la broche 16. Ces moyens élastiques permettent une démultiplication avec amortissement qui a pour résultat d'augmenter le temps de montée en couple et donc d'améliorer la pression du serrage.In order to further improve the precision as to stopping at the correct set value, elastic means 5a can be added, for example inside the body of the machine near the bevel gear 5 as shown diagrammatically in FIG. 1. Such elastic means allow a differential rotation between the part 9a of the shaft 9 rigidly connected to the rotary motor means and the part 9b rigidly connected to the tool via the pin 16. These elastic means allow a reduction with damping which results in increasing the torque build-up time and therefore improving the tightening pressure.

Ces moyens élastiques sont constitués de façon connue en soi et ne seront pas développés plus longuement.These elastic means are constituted in a manner known per se and will not be developed further.

D'autres éléments peuvent être avantageusement ajoutés à ce circuit de contrôle et de commande d'une machine pneumatique selon l'invention. Par exemple, un système 50 permettant la progammation de la durée du serrage dans le cas où la machine est une visseuse. Il est par ailleurs possible, par l'intermédiaire d'un dispositif 52 de changement de vitesses, de modifier les paramètres de fonctionnement de la machine par exemple pour avoir une vitesse de travail différente.Other elements can advantageously be added to this control and command circuit of a pneumatic machine according to the invention. For example, a system 50 allowing the programming of the tightening duration in the case where the machine is a screwdriver. It is also possible, by means of a speed change device 52, to modify the operating parameters of the machine for example to have a different working speed.

Le fonctionnement des machines réalisées selon l'invention est expliqué ci-après.The operation of the machines produced according to the invention is explained below.

L'air comprimé est branché sur la machine par adaptation d'un raccord sur le conduit d'alimentation 2 d'air comprimé. L'outil est alors à l'arrêt. Par action sur les moyens de commande 12, 42, (le clapet de fermeture 11 étant ouvert ou la vis pointeau 44 étant prérèglée dans une position déterminée), l'air comprimé alimente les moyens moteurs rotatifs 3, 45 entraînant le réducteur 4 qui fait tourner la broche 16, 46 sur laquelle est adapté l'outil. Simultanément, les moyens rotatifs 3 entraînent le générateur 6 de courant, qui après avoir été transformé, est stocké, par exemple, dans la batterie 24 qui sert à l'alimentation générale du circuit de contrôle-commande.Compressed air is connected to the machine by adapting a connection to the compressed air supply pipe 2. The tool is then stopped. By action on the control means 12, 42, (the closing valve 11 being open or the needle screw 44 being preset in a determined position), the compressed air supplies the rotary motor means 3, 45 driving the reducer 4 which makes turn the spindle 16, 46 on which the tool is fitted. Simultaneously, the rotary means 3 drive the current generator 6, which after having been transformed, is stored, for example, in the battery 24 which is used for the general supply of the control-command circuit.

Dans le cas d'une visseuse et au préalable, l'opérateur aura affiché en consigne, par l'intermédiaire des moyens 31 (clavier, potentiomètre, ...) la valeur de consigne du couple maximum auquel il veut arriver lors du serrage. Le vissage de la vis est ensuite effectué et la montée en couple lors du serrage se fait. Lorsque les capteurs d'effort transmettent un signal représentatif donnant un couple de valeur égal à la valeur de consigne, l'excitation de l'électro-aimant 13 provoque la fermeture du clapet 11 et l'arrêt de la machine.In the case of a screwdriver and beforehand, the operator will have displayed in setpoint, by means 31 (keyboard, potentiometer, ...) the setpoint of the maximum torque at which he wants to arrive during tightening. The screwing of the screw is then carried out and the torque increase during tightening is done. When the force sensors transmit a representative signal giving a torque of value equal to the set value, the excitation of the electromagnet 13 causes the valve 11 to close and the machine to stop.

Dans le cas du fonctionnement d'une machine type meuleuse, l'opérateur affiche la vitesse à laquelle il veut effectuer son opération de meulage par l'intermédiaire des moyens 35a de selection d'une valeur de consigne. Lors du meulage, l'état de surface de la pièce à meuler, la pression manuelle exercée par l'opérateur, et l'état de l'outil vont varier. La vitesse de rotation, fonction de ces paramètres va donc également varier et permettre alors de réguler l'arrivée d'air en agissant par l'intermédiaire des moyens de régulation 35 sur la vanne pointeau 44 comme précédemment décrit, par action sur le micro-moteur 51.In the case of the operation of a grinder-type machine, the operator displays the speed at which he wants to carry out his grinding operation by means 35a of selecting a set value. During grinding, the surface condition of the workpiece, the manual pressure exerted by the operator, and the condition of the tool will vary. The speed of rotation, which is a function of these parameters, will therefore also vary and will then make it possible to regulate the air intake by acting through the regulating means 35 on the needle valve 44 as previously described, by action on the micro- motor 51.

Comme il va de soi, et comme il résulte d'ailleurs de ce qui précède, l'invention ne se limite nullement à ceux de ces modes d'application et de réalisation qui ont été plus spécialement envisagés elle comprend par exemple des moyens qui vont permettre, notamment dans le cas des visseuses :

  • - le vissage de vis auto-perceuses ou auto-taraudeuses, dans des pièces nécessitant un couple de vissage supérieur au couple de serrage,
  • - le serrage d'approche à vitesse rapide et le blocage de la vis ou de l'écrou à vitesse lente, mais à couple supérieur,
  • - un marquage à la peinture des vis ou écrous serrés,
  • - des durées de serrage programmables,
  • - des changements de vitesses automatiques.
As is obvious, and as it follows from the above, the invention is in no way limited to those of these modes of application and embodiments which have been more especially envisaged, it comprises for example means which will allow, especially in the case of screwdrivers:
  • - the screwing of self-drilling or self-tapping screws, in parts requiring a torque greater than the tightening torque,
  • - tightening approach at high speed and locking the screw or nut at slow speed, but at higher torque,
  • - a paint marking of tight screws or nuts,
  • - programmable tightening times,
  • - automatic gear changes.

Pour les meuleuses, taraudeuses, et perceuses :

  • - en plus de la régulation des vitesses de rotation, une programmation de vitesses, notamment pour avoir un démarrage progressif.
For grinders, tappers, and drills:
  • - in addition to regulating the rotation speeds, programming speeds, in particular to have a gradual start.

Grâce aux machines selon l'invention une meilleure qualité dans le travail effectué par l'opérateur et un meilleur contrôle de ce travail est possible. L'affichage des paramètres de fonctionnement sur la machine permet à l'opérateur de s'adapter aux conditions particulières de son travail en permanence.Thanks to the machines according to the invention, better quality in the work performed by the operator and better control of this work is possible. The display of operating parameters on the machine allows the operator to adapt to the particular conditions of his work at all times.

On peut également prévoir sur la machine des sorties sur lesquelles vont venir se connecter des équipements séparés. Un dialogue entre le circuit électronique de contrôle et de commande incorporé de la machine et des systèmes 55 de traitement externe de données (enregistrement des paramètres de travail par exemple) est alors possible. Des modifications concernant les règlages de la machine elle-même, ou encore l'asservissement à la machine d'un poste fixe sur lequel la machine portative selon l'invention serait montée ou plus généralement, son utilisation par un robot sont donc tout à fait envisageables.It is also possible to provide outputs on the machine to which separate equipment will come to connect. A dialogue between the incorporated electronic control and command circuit of the machine and of the systems 55 for external data processing (recording of the working parameters for example) is then possible. Modifications concerning the settings of the machine itself, or even the enslavement to the machine of a fixed station on which the portable machine according to the invention would be mounted or more generally, its use by a robot are therefore entirely possible.

A titre d'exemple, on peut citer le recul automatique d'une perceuse pour le débourrage des copeaux lorsque le couple de travail atteint une valeur maximum prédéterminée.By way of example, one can cite the automatic reversing of a drill for breaking the chips when the working torque reaches a predetermined maximum value.

Claims (10)

1. Portable pneumatic machine comprising: a body (1) having a compressed air inlet channel rotary drive means (3) located within the body actuated by the flow of compressed air and arranged for rotating a tool device (10) for cutting off the air flow feeding the machine an electric generator (6) having a rotor (7) and a stator (8) located within the body the rotor (7) being suitable for being mechanically rotated by the rotary drive means (3) characterized in that the pneumatic machine further comprises:
- an electronic circuit (13) for controlling and monitoring operation of the pneumatic machine accommodated within the body (1) of said machine and fed with electrical current delivered by the electric generator (6)
- and in that the generator (6) is arranged for directly delivering to said electronic circuit in addition to the current for feeding said circuit signals which represent at least one operating parameter of the machine the signals being used by said circuit for controlling the device cutting off the air flow and monitoring operation of the machine.
2. Pneumatic machine according to claim 1 characterized in that the device for cutting off the air flow (10) which feeds the machine is integrated within the body (1) of the machine and in that the machine comprises means (25, 26) suitable for transmitting a signal which is representative of the torque exerted by the rotary drive means (3) on the tool to the electronic circuit (13) which controls and monitors operation of said machine and in that said circuit (13) comprises means (31) for selecting a set value of a maximum output torque of said drive means (3) and for controlling (29) the air cut off device (10) when the torque reaches said set value.
3. Pneumatic tool according to claim 1 or 2 characterized in that the electric generator (6) is constructed for delivering a signal which represents the angular position of the rotary drive means (3) and of the tool and in that the electronic circuit (13) for controlling and monitoring the machine comprises means (29a, 29) for selecting a set value of the angular position of the tool and for controlling the air flow cut off device (10) when the angular position of the tool reaches said set value.
4. Pneumatic tool according to any one of the preceding claims, characterized in that it further comprises measuring means (70, 71) suitable for measuring the increase of the value of the output torque of the drive means during tightening versus time or the angular position of the drive means computation means (72, 73) suitable for deriving, from the increase of said torque the anticipated shape of a later increase of the torque and to derive from a set time to or a set angle ao the tightening time t or the angle ao which remains necessary for reaching the set value of the torque and means (74) for enabling timing means or means for counting turns from that time to or that angle ao which are arranged to stop said machine after time t or rotation of angle a.
5. Pneumatic machine according to any one of the preceding claims, characterized in that it further comprises resilient means for demultiplying and dampening the torque exerted by the rotary drive means on the tool, whereby the time duration required for the torque to build up is increased and precision of the tightening action is improved.
6. Pneumatic machine according to claim 1 characterized in that the electric generator (6) is arranged for delivering a signal which represents the rotation speed of the rotary drive means (3) and in that the electronic circuit (13) for controlling and monitoring the machine comprises means (35a) for selecting a set value of the speed and means (35) for maintaining said speed at said set value.
7. Pneumatic tool according to any one of the preceding claims characterized in that it comprises integrated means (24) for storing the electric energy delivered by the electric generator means such as a battery of accumulators.
8. Pneumatic tool according to any one of the preceding claims, characterized in that it comprises at least one display screen (28, 33, 29b, 32) associated with the electronic circuit for displaying the value of at least one of the operating parameters or one of the set values to which said operating parameter should operate during use said screen being fixed to the body (1) of the machine.
9. Pneumatic tool according to any one of the preceding claims characterized in that the electronic control and monitoring circuit is programmable.
10. Pneumatic tool according to any one of the preceding claims, characterized in that it comprises means (60) for storing the operating parameters of the machine said means being carried by the body (1) of the machine.
EP87401739A 1986-07-31 1987-07-24 Portable pneumatic machine with an electronic control system Expired - Lifetime EP0255433B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87401739T ATE57123T1 (en) 1986-07-31 1987-07-24 PORTABLE PNEUMATIC MACHINE WITH ELECTRONIC CONTROL.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8611141 1986-07-31
FR8611141A FR2602169B1 (en) 1986-07-31 1986-07-31 PORTABLE PNEUMATIC MACHINE WITH BUILT-IN CONTROL ELECTRONICS

Publications (2)

Publication Number Publication Date
EP0255433A1 EP0255433A1 (en) 1988-02-03
EP0255433B1 true EP0255433B1 (en) 1990-10-03

Family

ID=9337936

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87401739A Expired - Lifetime EP0255433B1 (en) 1986-07-31 1987-07-24 Portable pneumatic machine with an electronic control system

Country Status (6)

Country Link
US (1) US4805404A (en)
EP (1) EP0255433B1 (en)
JP (1) JPS63221981A (en)
AT (1) ATE57123T1 (en)
DE (1) DE3765349D1 (en)
FR (1) FR2602169B1 (en)

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Also Published As

Publication number Publication date
FR2602169B1 (en) 1988-11-04
ATE57123T1 (en) 1990-10-15
JPS63221981A (en) 1988-09-14
DE3765349D1 (en) 1990-11-08
US4805404A (en) 1989-02-21
FR2602169A1 (en) 1988-02-05
EP0255433A1 (en) 1988-02-03

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