The present invention relates to a marking or labeling machine that includes a member such as a punch that is designed to press a ribbon against the peripheral surface of a workpiece for marking or labeling. The invention also relates to a marking or labeling method in which workpieces are successively brought into register with a marking member, such as a punch, or into register with a label applicator member.
In the field of hot-marking, it is known, e.g. from WO-A-2008/142225, that it is possible to use a punch to press a marking ribbon against the peripheral surfaces of workpieces for marking that are mounted on six cores carried by a turntable. Those cores go successively to a loading position, to a marking position, to an inspection position, and to an unloading position, as well as to various intermediate positions. The speed at which the workpieces are marked depends on the mean speed of rotation of the turntable, which speed is, in practice, limited by the various operations that need to be performed on the workpieces for marking or that have already been marked, while the turntable is at a standstill.
It is also known from GB-A-1 558 536 to move cups between various stations in a print machine by means of four intermediate members hinged about a central axle and each of which is connected to the axle of a respective planet gear wheel. The various planet gear wheels interact, one after another, with a ramp of a cam that also turns about the central axle. The movements of the various intermediate members are interdependent insofar as a single cam is used to move said intermediate members, it being possible for said cam to interact with any one of the intermediate members only once said cam has already left or while it is leaving another intermediate member. The movements of two planet gear wheels overlap in time, but cannot take place at the same time, due to the fact that the single cam can take up only one angular position about the central axle at any one time.
Analogous problems arise with other marking machines, in particular screen-printing marking machines, and with labeling machines.
More particularly, an object of the invention is to remedy those drawbacks by proposing a novel marking or labeling machine of productivity that is significantly improved compared with prior art marking and labeling machines.
To this end, the invention provides a marking or labeling machine comprising at least one marking or labeling member, and feed means for bringing each workpiece for marking or labeling into register with the marking or labeling member, said feed means comprising at least two arms mounted to turn about a common first axis, and each carrying at least one member for supporting a workpiece for marking or labeling. According to the invention, the feed means further comprise independent means for driving each of the arms in rotation about the common first axis independently of the other arm.
By means of the invention, time can be saved by moving each arm while the other arm(s) is/are involved in one or more other operations. In other words, one of the arms can be moving a workpiece for marking or that has already been marked, or a workpiece for labeling or that has already been labeled, while the other arm is in a station in which action is being taken on another workpiece, such as a loading station, a marking station, an inspection station, or an unloading station. This is particularly advantageous because the lengths of time for which an arm remains stationary in any one of the above-mentioned stations vary as a function of the operations to be performed. The independence of the means for driving the arms in rotation about the first axis thus makes it possible for each arm to move independently from the other arm(s), at its own speed between the various stations, without hindering the actions being taken on the workpieces supported by the other arm(s). By means of appropriate control, a machine of the invention that has two independent arms makes it possible to process workpieces for marking or for labeling at a processing speed comparable to the speed procured with a machine equipped with a turntable on which six cores are mounted, which is advantageous in terms both of the cost of the machine and also of the inertia of the moving masses, and thus of the lifetime of the machine.
In advantageous but non-essential aspects of the invention, such a machine may incorporate one or more of the following characteristics, taken in any technically feasible combination:
The invention also provides a marking or labeling method that can be implemented with a machine as described above, and, more specifically, a method in which workpieces for marking or labeling are brought successively into register with at least one marking or labeling member. This method is characterized in that it comprises steps consisting in:
In this method, each arm moves the workpiece, for marking or already marked, independently of the other arms, while also enabling it to be driven in rotation about the first and second axes, thereby saving time during the marking.
The invention can be better understood and other advantages of the invention appear more clearly from the following description of four embodiments of a machine that complies with the principle of the invention, and of a method of using said machine, the description being given merely by way of example and with reference to the accompanying drawings, in which:
In order to make the drawing clearer, the marking ribbon of the machines of
The machine 2 shown in
The ribbon 8 extends between a feed reel and a used ribbon take-up reel, which reels are known per se and are not shown. The ribbon 8 is guided by deflector rollers 16A and 16B.
In order to bring the workpieces for marking into register with the punch 6, the machine 2 is equipped with two arms 20 and 22 that are mounted to move in rotation about a common axis X2 that is defined by the frame 4 and that is perpendicular to the direction of movement of the punch 6, i.e. horizontal in the example shown in the figures.
In the present description, the terms “front” and “back” are used considering the machine 2 seen as shown in
The frame 4 comprises a front plate 4A, a longitudinal girder 4B, a back plate 4C and a supporting structure 4D, all of which are stationary. A rotary manifold 10 is mounted on the plate 4A and is fed with pressurized air to be distributed between the various pneumatic members of the machine 2. The manifold comprises a stationary core 101 provided with a central orifice and with a plurality of ducts through which pressurized air flows towards grooves provided at the periphery of said core. A first ring 102 is mounted around the core 101, while being movable in rotation about the axis X2. A hollow shaft 103 is mounted in alignment with the core 101, along the axis X2, and has an end 1032 that surrounds the core 101 in part, while being movable in rotation about the axis X2. A second ring 104 is mounted around the shaft 103 while being movable in rotation about the axis X2. A plate 105 interconnects the two rings 102 and 104 by being secured to each of them by means of screws, so that said rings can turn together about the axis X2, and about the elements 101 and 103. A bearing 120 is interposed between the ring 104 and the shaft 103. A sleeve 106 is constrained to move in rotation with the ring 104.
The arm 20 comprises a front plate 202 and a back plate 204 that are interconnected via a plateau 206 provided with an opening 208. The arm 202 is mounted on the sleeve 106 that is itself supported by the bearing 120 relative to the shaft 103.
The arm 20 carries a piece of equipment 210 for supporting a workpiece for marking, which piece of equipment comprises a housing 212, a hollow core 213 and two bearings 214 and 215 for supporting the hollow shaft 213 relative to the to the housing 212, while enabling said shaft to move in rotation about an axis X20 defined by the housing 212, which axis is parallel to the axis X2 and distinct therefrom.
As appears more particularly from
The front portion 2132 is designed to be engaged into a workpiece for marking whose outline is shown in chain-dotted lines in
At its end opposite from the piece of equipment 210, the arm 20 is equipped with a counterweight 203 that makes it possible to balance the effect of the arm 20 on the shaft 103.
The arm 22 has a structure comparable to the structure of the arm 20 and comprises a front plate 222, a back plate 224, and a plateau 226 provided with an opening that is not shown in the figures but that is comparable to the opening 208. A piece of equipment 230 is mounted on the arm 22 and comprises a housing 232, a two-portion core 233 and bearings comparable to the bearing 214 and 215. The arm 22 is mounted on a third ring 108 that is constrained to rotate with the end 1034 of the shaft 103 that is opposite from the core 101. A counterweight (not shown) equips the arm 22.
A brushless electric motor 30 is mounted on a mounting plate 4E that is part of the frame 4 and its outlet shaft is in engagement with a cog belt 40 that is wrapped around a cog band 50 keyed onto a hollow shaft 60 on which a support 209 is held stationary. The back plate 204 of the arm 20 is fastened to the support 209 by means of screws, one of which is visible in
In addition, a second brushless motor 32 is mounted on a mounting plate 4F that is part of the frame 4, and its outlet shaft engages a cog belt 42 that wraps around a cog band 52 that is secured by means of screws 54 to a support 219. The back plate 224 of the arm 22 is mounted on the support 219 by means of screws, only one of which is visible in
Since the motors 30, 32 can be powered independently from each other, the drive trains formed by these motors, by the cog belts, by the cog bands, and by the supports that are mentioned above, and by the shaft 60 when considering the arm 20, constitute independent drive means for driving each of the arms 20 and 22 in rotation about the axis X2, independently of the other arm.
In addition, a third brushless motor 34 is supported by the frame 4 and its outlet shaft drives a belt 44 that is in engagement with a pulley 74 keyed to the end of a shaft 84 aligned on the axis X2 and disposed radially inside the shaft 60. The end of the shaft 84 that is opposite from the pulley 74 carries a second pulley 94 around which a belt 114 is wrapped that goes via the opening 208 and that is also wrapped around a pulley 134 mounted around and constrained in rotation with the back portion 2134 of the hollow core 213. It is thus possible, by energizing the motor 34, to cause the elements 74, 84, 94, 114, 134, and 213 to turn so that the hollow core 213 turns about the axis X20. This makes it possible to drive a workpiece for marking 400 about its longitudinal axis, when said workpiece is supported by the front portion 2132 of the core 213.
In the same manner, a fourth brushless motor 36 is supported by the frame 4 and drives a belt 46 that engages a pulley 76 that is mounted at a first end of a shaft 86 aligned on the axis X2 and that is disposed radially inside the shaft 84. A second pulley 96 is fastened to opposite end of the shaft 86 and drives a belt 116 that is visible in the cutaway view of
The shaft 86 extends along the axis X2 to the inside of the end 1034 of the shaft 103 where a band 88 is keyed to the shaft 86. A bearing 122 centers the shafts 86 and 103 mutually while enabling them to move in rotation relative to each other.
The drive means for driving the cores 213 and 223 in rotation respectively about the axes X20 and X22, are independent from each other insofar as they make it possible to drive one or the other of the cores 213 and 233 in rotation about the axes X20 and X22 or both of them, depending on whether the motor 34 or the motor 36 is energized or whether both of these motors are energized.
Since the motors 30 to 36 are supported by the frame 4, they are not moved while the arms 20 and 22 are being moved in rotation, so that the inertia of said arms is relatively small, thereby facilitating movements at high speed and limiting wear on the support parts such as the bearings.
In an optional aspect of the invention that is not shown, belt-tensioning idlers can be disposed along the paths of the belts, in particular along the paths of belts 114 and 116.
When a workpiece 400 is to be marked with the ribbon 8, said workpiece is mounted on one of the arms, e.g. the arm 20 and said arm is moved to the vicinity of the punch 6 in the direction indicated by the rotation arrow R20 in the first view of
In the variant shown in
During these movements, the movement in rotation of the arm 22 between the unloading station in which the arm is present in the first view and the loading position in which said arm is present in the third view takes place without requiring any additional time since it takes place within the time for which the arm 20 needs to be held stationary for the purpose of marking the workpiece that it carries. The arrow R22 represents this movement in rotation.
In the last step of the method shown in
In a variant of the methods shown in
In the second to fourth embodiments of the invention, shown in
In the second embodiment shown in
In the same way, the arm 22 comprises two portions 22A and 22b that extend on either side of the axis X2 and each of which carries a hollow core 233A and 233B forming a respective support for receiving and moving a respective workpiece for marking.
The arms 20 and 22 are not provided with counterweights in this example.
The arm portions 20A & 20B are integral with or secured to each other, as are the arm portions 22A & 22B, and said arm portions are driven in rotation in a manner comparable to the manner indicated for the first embodiment, by respective brushless motors 30 and 32 associated with belts 40 and equivalent. Similarly, two brushless motors 34 and 36 make it possible to drive the hollow shafts 213A, 213B, 233A and 233B respectively about their longitudinal axes X20A, X20B, X22A, X22B.
As appears more particularly from
As appears more particularly from
The method of
In the third embodiment of
Otherwise, brushless motors 30 and 32 analogous to the motors of the first embodiment are used, together with cog belts, for driving the shafts 20 and 22 in rotation about the axis X2.
Each of the motors 38 and 39 is powered by means of an electric cable, the electric cable 138 of the motor 38 being visible in
In order to lighten the moving masses that are moved by each arm 20 or 22, the variable-speed drive units 148 and 149 for controlling the motors 38 and 39 are mounted on a turntable 160 mounted to turn about the axis X2. These variable-speed drive units 148 and 149 are uniformly distributed on the turntable 160. In practice, the cable 138 extends between the slip-ring assembly 150 and a variable-speed drive unit 148 and then from the variable-speed drive unit 148 to the motor 38. In order to prevent the cable 138 from being twisted while the machine 2 is being used for a relatively long period, or from being torn off from one of the variable-speed drive units 148 or from the motor 138, the turntable 160 is driven in rotation about the axis X2 by means of a brushless motor 162 that engages a hollow shaft 164 at the centre of which the cable 138 also runs.
The turntable 160 is driven by the motor 162 at an angular velocity corresponding to the mean speed of movement of the arms 20 and 22 about the axis X2. Thus, at the end of a turn of the arms 20 and 22, the turntable 160 resumes an angular position corresponding to its starting position relative to the arms 20 and 22. Under these conditions, the angular offset between the turntable 160 and the motors 38 and 39 remains relatively small, to the extent that there is no risk of it damaging the cable 138 or the corresponding cable that powers the motor 39.
The embodiment shown in
The motors 300 and 320 thus make it possible to drive the arms 20 and 22 independently from each other about the axis X2 that is an axis of rotation that is common to the rotors 302 and 322. Cores 213 and 233 mounted at the ends of the arms 20 and 22 are driven about two axes X20 and X22 that are parallel to the axis X2 by motors 38 and 39 that are analogous to the motors of the third embodiment.
In all of the embodiments, a rotary manifold 10 makes it possible to feed air to pneumatic members such as positioning actuators. For example, each arm 20 or 22 can be associated with an actuator making it possible to press a workpiece for marking onto the core 213 or 233. In addition, the hollow cores 213 and 233 can be fed with air so as to “inflate” a workpiece 400 before it is marked, in order to put its wall under tension.
Regardless of the embodiment, the invention makes it possible to position the various stations in which action is taken on the workpieces for marking in positions that are angularly spaced apart at an angular spacing that is not necessarily set at 60° , as in a prior art machine having a turntable. The angular spacing between the loading station and the zone in which the marking is applied to the workpiece may be different from the angular spacing between the marking zone and the unloading zone. In addition, the invention makes it possible to load an article on one of the arms 20 or 22 in all of the angular positions about the axis X2, thereby making it possible to adapt the loading station to accommodate the geometrical shape of the workpieces to be marked.
The invention also makes it possible to drive a workpiece for marking in rotation about the axis X20 or X22, even though the arm 20 or 22 that supports it is still moving in rotation about the axis X2, thereby making it possible to save time at the beginning of a marking step by means of the anticipation that is achieved. The accelerations to which the workpieces in movement are subjected can be reduced by means of this anticipation.
In a variant (not shown) of the invention, the punch used for marking the workpieces can be a punch that is not a hot punch.
In another variant (not shown), two or more marking members can be used because the arm can stop successively facing each of the marking members independently of the paths over which the other arms travel.
Arms each carrying two supports such as the shafts 213 and 233 can be used with the third and fourth embodiments, by applying the technical teaching of the second embodiment.
The number of arms of the machine may, in a variant, be greater than two.
As an alternative to the belts that form flexible links for driving the arms or the cores, it is possible to use chains.
The invention is described above as implemented when the marking takes place by means of a workpiece moving in rotation on its core. The invention may however be implemented in a machine in which the marking is performed by direct punching, on a plane face of an article. The invention may also be implemented in a machine for marking specially shaped workpieces, i.e. workpieces of non-circular section.
The invention is described above and shown in the accompanying figures for an embodiment in which it is applied to a marking machine which is entirely advantageous.
The invention may also be implemented for a screen-printing machine, in which case a workpiece for marking is to be moved facing an inked screen that forms a marking member, whose function is comparable to the above-mentioned punch 6.
The invention is also applicable, in another embodiment, to a labeling machine, and more precisely to a machine for applying labels, in which machine a web on which labels are disposed travels to the vicinity of workpieces to be labeled, while a presser member or applicator periodically presses the web against the outside surfaces of the workpieces to be labeled, in order to apply labels to said surfaces. The workpieces for labeling must be moved relative to the label applicator and the invention can be implemented for this purpose.
Number | Date | Country | Kind |
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09 53019 | May 2009 | FR | national |