EP0582946A1 - Machine de peinture par pulvérisation comprenant un bras rotatif à vitesse variable - Google Patents

Machine de peinture par pulvérisation comprenant un bras rotatif à vitesse variable Download PDF

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Publication number
EP0582946A1
EP0582946A1 EP93112447A EP93112447A EP0582946A1 EP 0582946 A1 EP0582946 A1 EP 0582946A1 EP 93112447 A EP93112447 A EP 93112447A EP 93112447 A EP93112447 A EP 93112447A EP 0582946 A1 EP0582946 A1 EP 0582946A1
Authority
EP
European Patent Office
Prior art keywords
guns
conveyor
support
spray
spray painting
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP93112447A
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German (de)
English (en)
Other versions
EP0582946B1 (fr
Inventor
Gianni Raggi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Cefla SCARL
Original Assignee
Cefla SCARL
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Filing date
Publication date
Application filed by Cefla SCARL filed Critical Cefla SCARL
Publication of EP0582946A1 publication Critical patent/EP0582946A1/fr
Application granted granted Critical
Publication of EP0582946B1 publication Critical patent/EP0582946B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B13/00—Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00
    • B05B13/02—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work
    • B05B13/04—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work the spray heads being moved during spraying operation
    • B05B13/0463—Installation or apparatus for applying liquid or other fluent material to moving work of indefinite length
    • B05B13/0484—Installation or apparatus for applying liquid or other fluent material to moving work of indefinite length with spray heads having a circular motion, e.g. being attached to a rotating supporting element

Definitions

  • the present invention concerns a machine to apply liquid products - particularly paints - by spraying, onto objects of any type, such as manufactured wooden, plastic and leather articles, or the like, while they are moving on a belt conveyor. More particularly, the present invention concerns a spray painting machine, wherein the spray guns are movable and are carried by a single support rotating at variable speed along a circular trajectory.
  • the known spray painting machines with movable spray guns can be substantially divided into three types, according to the motion imparted on the guns W, and precisely:
  • the continuous reciprocating motion of the gun units determines strict limits due to inertia of the moving masses; the speed - and thus the productivity of the machine - cannot therefore be increased beyond specific levels. Furthermore, at each motion reversal, the guns return at once on the area which has just been sprayed, thereby running into the paint dust which the appropriate suction devices have not yet been able to remove from the spray painting area. This causes a fouling of the guns and hampers the regular removal of paint dust, which can thus deposit onto the painted objects, spoiling the quality of the spray paint.
  • the working time of the guns - namely, the length of time during which the guns are positioned on the work area - is about 45-50% of the time required for the guns to travel along the whole path.
  • the kinematic problem is solved in a far more satisfactory way, since the only inertias - besides those, of scarce importance, determined by the constant bending of the pipes and electric cables - are the ones deriving from the mass of the spray guns in the sudden changes of direction, at the inlet and outlet of the curves of the oval path. Also the problem of paint dust is more easily solved, since the gun paths in a forward and backward direction are spaced to an extent such as to allow a sufficient separation between the dust flows moving in opposite directions. This problem however arises again - even though to a reduced extent - on each single going and return path, which the guns follow at great speed.
  • the carrousel sprayers are rather complicated machines and require a toilsome and expensive maintenance. They must in fact be provided with a central supply system, in the form of a multiple rotating joint, to feed paint and compressed air, as well as to connect the necessary electric circuits to the single guns.
  • a rotating joint of this type is described, for example, in the Utility Model IT-B-184353.
  • Such a device owing to its complexity, is easily subject to breaking and failures (particularly dangerous in case of electric connections, when spraying paints diluted into flammable solvents), also due to the high pressure imparted on the rotating seals for the compressed air and, above all, for the paint.
  • the pipes feeding compressed air and paint, and the electric cables which connect the rotating joint to the single guns are subject to continuous bending - since the distance between the guns and the joint varies continuously along their oval path - whereby they have to be periodically replaced in order to avoid dangerous breakdowns, which would involve a particularly difficult operation due to the complexity and high number of components having to be replaced.
  • the working time of the guns is slightly shorter than that of the oscillating sprayers, as it is equal to about 40-45% of the time required for the guns to travel along the whole oval path.
  • the turntable type of spray painting machines can generally be compared to the carrousel ones, whereby they suffer from all the above drawbacks connected not only with the presence of the central rotating joint, but also with the problem of paint dust; nevertheless, they form an improvement over the same from the kinematic point of view.
  • this type of machine has no problems of inertia, either for what concerns the guns, since their path is perfectly circular and thus undergoes no sudden changes of direction, or for what concerns the pipes and electric cables which connect the guns to the rotating joint, since these are of fixed length and can thus be permanently anchored to the spokes of the turntable, with undoubted advantages also from the point of view of replacement frequency.
  • This type of sprayer is instead far less efficient for what concerns the uniformity of the painting operation.
  • the transversal component of the guns motion speed varies depending on the angle sine formed by the tangent to the circular path with the axis of the belt conveyor supporting the objects to be painted.
  • said transversal speed is considerably reduced at the sides of the conveyor, while being very high at its centre. In this way, the amount of paint being sprayed is greater on the sides of the conveyor than in the centre, which makes it impossible to spread a uniform layer of paint on all the objects being treated.
  • turntable sprayers wherein mechanical devices are provided to continuously vary the angular position of the guns in respect of the turntable, so as to keep said position substantially constant in respect of the conveyor axis.
  • Such machines wherein the actual working time of the guns is anyhow less than 50% compared to the full cycle time - have however proved to be complicated and scarcely reliable, and have met with no success on the market. Machines of this type are described, for example, in WO 91/05615 and in FR-2.172.726.
  • the sprayer of FR-2.172.726 provides a support for one or more spray guns, mounted at the end of an arm rotating at constant speed to move along a circular path lying on a plane parallel to the conveyor surface, a gearwheel and chain drive, associated to said arm, keeping the angular position of the support unvaried in respect of the moving forward direction of the conveyor during the rotary motion of said arm.
  • the object of the present invention is to therefore supply a new type of spray painting machine, which still provides all the kinematic advantages of the known turntable sprayers, but which also allows to reduce the times in which the spray guns are positioned out of the work area (dead times) in respect of those in which they operate in said area.
  • said object is reached by means of a machine to spray paints and the like onto objects moving on a belt conveyor - of the type comprising a plurality of spray guns movable along a circular path lying on a plane parallel to the surface of the conveyor, and having at least two sections substantially transversal to the moving forward direction of the conveyor, said spray guns being carried by a single support movable along said path, and means being provided to keep the angular position of said support, during its rotary movement, unvaried in respect of the moving forward direction of the conveyor (namely, in respect of its longitudinal axis) - characterized in that, the movement of the support for the spray guns is controlled by drive means apt to impart thereon a variable speed, with a substantially sinusoidal law, between a minimum speed in correspondence of the path sections of the guns substantially transversal to the longitudinal axis of the conveyor (work areas) and a maximum speed in correspondence of the path sections of the guns substantially parallel to said longitudinal axis (dead areas).
  • the spray painting machine comprises a single rotary arm 1, at the free end of which there is mounted a support 2 for a set of spray guns 3 (eight guns in this case).
  • Said spray painting machine is positioned above a belt conveyor T - along which slide the objects to be painted - so that the rotation axis of the arm 1 intersects the axis S of the conveyor T.
  • the arm 1 is fixedly connected to the lower end of a sleeve 4, which is mounted rotating on a fixed shaft 5 upwardly projecting from the arm 1.
  • a gearwheel 6 meshing with a toothed driving belt or chain 7, the other end of which meshes with a gearwheel 8 keyed onto a shaft 2a carrying the support 2 for the set of spray guns 3.
  • the shaft 2a is mounted, freely rotating, onto the arm 1, and the gear ratio between the gearwheels 6 and 8 is of 1:1.
  • This mechanical arrangement imparts from the top a rotary motion on the arm 1. Furthermore, thanks to said arrangement, when the arm 1 is caused to rotate - by way of the control system acting on the sleeve 4, illustrated hereinafter - the support 2 keeps unvaried its angular position in respect of the axis of the conveyor T (as illustrated in fig. 2 by the various positionings of the set of spray guns 3).
  • the aforedescribed spray painting machine is hence provided with a single set of guns 3, which keeps its angular position unaltered while the arm 1 is rotating, and which can thus be fed by a stiff pantograph rod 9 - diagrammatically illustrated by a dashed line in figs. 2 and 3 - or by an articulated cable chain, thereby fully eliminating the need for a rotating joint.
  • the rod 9, or chain is connected at one end to the fixed structure of the machine and, at the other end, to the support 2 for the set of spray guns 3 (to any part of said support but, preferably, to its centre, in correspondence of the shaft 2A).
  • this spray painting machine is provided with a system to control the arm 1, such as to determine its rotation at a speed varying with a sinusoidal (or substantially sinusoidal) law, and not at a constant speed as in the case of the known type turntable machines.
  • This variable rotation speed of the arm 1 can be obtained by different mechanical, as well as electronic, techniques of known type, and it allows to accomplish the important advantages described hereinafter.
  • said control system comprises two identical gears 11 and 12, having their respective centres in 11a and 12a, but being mounted rotating on eccentric shafts, in correspondence of A and B. In this way, during rotation, said gears continue to oscillate, while keeping constantly meshed in correspondence of C.
  • the motion being transmitted to the sleeve 4 of the arm 1 is hence derived from the rotation axis (in B) of the gear 12, through a pair of gearwheels 13, 14, and respective drive belt 15, with a 1:2 gear ratio.
  • the arm 1 thus rotates at a speed with a double sinusoidal law for each cycle, as clearly shown in the graph of fig. 5.
  • a computer detects the angular position of the arm 1, through an encoder, and determines the rotation speed of the driving motor - according to the preset speed required in that specific angular position - by varying in known manner its electric feeding characteristics.
  • the spray painting machine according to the present invention provides furthermore - thanks to its structural shape - other advantages which are difficult to obtain simultaneously, such as the elimination of the rotating joint, a constant movement with no inertias, the possibility to maintain a constant angle between the spray jets of paint and the axis S of the conveyor T (namely, an arc-shaped painting trajectory, but with the guns always inclined by the same angle in respect of the conveyor axis), and the possibility to carry out an improved and more complete removal by suction of the dust produced by the paint which has failed to deposit on the objects being treated (since the set of guns moves back over the painted areas only after a full cycle, and thus after a time interval which is definitely longer than that taken by the guns in the solutions of known technique. It is thus evident that this longer time interval allows to remove the paint dust in a more efficient way).
EP93112447A 1992-08-10 1993-08-03 Machine de peinture par pulvérisation comprenant un bras rotatif à vitesse variable Expired - Lifetime EP0582946B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI921974 1992-08-10
ITMI921974A IT1256036B (it) 1992-08-10 1992-08-10 Spruzzatrice a braccio rotante a velocita' variabile

Publications (2)

Publication Number Publication Date
EP0582946A1 true EP0582946A1 (fr) 1994-02-16
EP0582946B1 EP0582946B1 (fr) 1996-10-30

Family

ID=11363863

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93112447A Expired - Lifetime EP0582946B1 (fr) 1992-08-10 1993-08-03 Machine de peinture par pulvérisation comprenant un bras rotatif à vitesse variable

Country Status (5)

Country Link
EP (1) EP0582946B1 (fr)
AT (1) ATE144729T1 (fr)
DE (1) DE69305710T2 (fr)
ES (1) ES2096155T3 (fr)
IT (1) IT1256036B (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4425229A1 (de) * 1994-07-16 1996-01-18 Abb Patent Gmbh Verfahren und Vorrichtung zum Auftragen von Flüssiglacken auf Oberflächen
CN104307669A (zh) * 2014-11-17 2015-01-28 上海天马微电子有限公司 一种用于显示面板的喷涂装置及喷涂方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108855685A (zh) * 2018-07-02 2018-11-23 芜湖鼎恒材料技术有限公司 一种电机端盖外端面喷涂装置

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2172726A5 (fr) * 1972-02-18 1973-09-28 Atlas Copco Ab
WO1982001832A1 (fr) * 1980-11-28 1982-06-10 Machine Co Inc Circle Atomiseurs rotatifs d'application de couches uniformes

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2172726A5 (fr) * 1972-02-18 1973-09-28 Atlas Copco Ab
WO1982001832A1 (fr) * 1980-11-28 1982-06-10 Machine Co Inc Circle Atomiseurs rotatifs d'application de couches uniformes

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4425229A1 (de) * 1994-07-16 1996-01-18 Abb Patent Gmbh Verfahren und Vorrichtung zum Auftragen von Flüssiglacken auf Oberflächen
CN104307669A (zh) * 2014-11-17 2015-01-28 上海天马微电子有限公司 一种用于显示面板的喷涂装置及喷涂方法

Also Published As

Publication number Publication date
ATE144729T1 (de) 1996-11-15
ES2096155T3 (es) 1997-03-01
DE69305710D1 (de) 1996-12-05
EP0582946B1 (fr) 1996-10-30
ITMI921974A0 (it) 1992-08-10
ITMI921974A1 (it) 1994-02-10
DE69305710T2 (de) 1997-04-30
IT1256036B (it) 1995-11-21

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