EP2125371B1 - Tape marking machine - Google Patents

Tape marking machine Download PDF

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Publication number
EP2125371B1
EP2125371B1 EP08787824.5A EP08787824A EP2125371B1 EP 2125371 B1 EP2125371 B1 EP 2125371B1 EP 08787824 A EP08787824 A EP 08787824A EP 2125371 B1 EP2125371 B1 EP 2125371B1
Authority
EP
European Patent Office
Prior art keywords
marking
tape
machine
ribbon
braking surface
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.)
Active
Application number
EP08787824.5A
Other languages
German (de)
French (fr)
Other versions
EP2125371A2 (en
Inventor
Marco PAÏTA
David Jean Robert Mandon
Laurent Callamand
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.)
Illinois Tool Works Inc
Original Assignee
Illinois Tool Works Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Illinois Tool Works Inc filed Critical Illinois Tool Works Inc
Priority to PL08787824T priority Critical patent/PL2125371T3/en
Publication of EP2125371A2 publication Critical patent/EP2125371A2/en
Application granted granted Critical
Publication of EP2125371B1 publication Critical patent/EP2125371B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41FPRINTING MACHINES OR PRESSES
    • B41F19/00Apparatus or machines for carrying out printing operations combined with other operations
    • B41F19/02Apparatus or machines for carrying out printing operations combined with other operations with embossing
    • B41F19/06Printing and embossing between a negative and a positive forme after inking and wiping the negative forme; Printing from an ink band treated with colour or "gold"
    • B41F19/064Presses of the reciprocating type
    • B41F19/068Presses of the reciprocating type motor-driven
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41FPRINTING MACHINES OR PRESSES
    • B41F16/00Transfer printing apparatus
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41FPRINTING MACHINES OR PRESSES
    • B41F17/00Printing apparatus or machines of special types or for particular purposes, not otherwise provided for
    • B41F17/08Printing apparatus or machines of special types or for particular purposes, not otherwise provided for for printing on filamentary or elongated articles, or on articles with cylindrical surfaces
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41FPRINTING MACHINES OR PRESSES
    • B41F17/00Printing apparatus or machines of special types or for particular purposes, not otherwise provided for
    • B41F17/08Printing apparatus or machines of special types or for particular purposes, not otherwise provided for for printing on filamentary or elongated articles, or on articles with cylindrical surfaces
    • B41F17/14Printing apparatus or machines of special types or for particular purposes, not otherwise provided for for printing on filamentary or elongated articles, or on articles with cylindrical surfaces on articles of finite length
    • B41F17/18Printing apparatus or machines of special types or for particular purposes, not otherwise provided for for printing on filamentary or elongated articles, or on articles with cylindrical surfaces on articles of finite length on curved surfaces of articles of varying cross-section, e.g. bottles, lamp glasses
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41JTYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J17/00Mechanisms for manipulating page-width impression-transfer material, e.g. carbon paper
    • B41J17/22Supply arrangements for webs of impression-transfer material
    • B41J17/24Webs supplied from reels or spools attached to the machine
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41JTYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J17/00Mechanisms for manipulating page-width impression-transfer material, e.g. carbon paper
    • B41J17/28Arrangements of guides for the impression-transfer material
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65HHANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H18/00Winding webs
    • B65H18/08Web-winding mechanisms
    • B65H18/10Mechanisms in which power is applied to web-roll spindle
    • B65H18/103Reel-to-reel type web winding and unwinding mechanisms
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65HHANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H20/00Advancing webs
    • B65H20/30Arrangements for accumulating surplus web
    • B65H20/32Arrangements for accumulating surplus web by making loops
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65HHANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H23/00Registering, tensioning, smoothing or guiding webs
    • B65H23/04Registering, tensioning, smoothing or guiding webs longitudinally
    • B65H23/06Registering, tensioning, smoothing or guiding webs longitudinally by retarding devices, e.g. acting on web-roll spindle
    • B65H23/10Registering, tensioning, smoothing or guiding webs longitudinally by retarding devices, e.g. acting on web-roll spindle acting on running web
    • B65H23/14Tensioning rollers applying braking forces
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41PINDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
    • B41P2219/00Printing presses using a heated printing foil
    • B41P2219/40Material or products to be decorated or printed
    • B41P2219/43Three-dimensional articles
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65HHANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2406/00Means using fluid
    • B65H2406/30Suction means
    • B65H2406/33Rotary suction means, e.g. roller, cylinder or drum
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65HHANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2701/00Handled material; Storage means
    • B65H2701/30Handled filamentary material
    • B65H2701/35Ropes, lines
    • B65H2701/357Marking strings, e.g. pre-inked lines

Definitions

  • the present invention relates to a hot stamping machine, of the type comprising a marking member for pressing a tape against the peripheral surface of individual pieces for marking.
  • the marking member In the case of marking with a punch movable in translation relative to the frame of the machine during marking, or a marking wheel, the marking member is pressing the tape against the peripheral surface of the part to be marked driven in rotation.
  • the ribbon is then moved opposite the marking member, by uncoiling with respect to a fixed unwinding flange relative to the frame of the machine and rewinding on a rewinding flange also fixed relative to the frame of the machine. machine, an appropriate tension of the ribbon being obtained between these two flanges by means of a constant tension device, such as a spring drumming arm.
  • a good ribbon tension is all the more important for a ribbon of small width, which is particularly sensitive to vibrations or other disturbances likely to change its position relative to the marking member.
  • a constant tension device such as a drummer arm generates, because of its inertia, and when the ribbon is of small width and the high marking rate, a jerky advance of the ribbon opposite the marking member, with a variation of the ribbon tension.
  • a variation in the tension of the ribbon may cause the appearance of marking defects on the parts.
  • the ribbon rewinding flange When the ribbon rewinding flange is loaded with the mobile punch relative to the machine frame during marking, or when the marking is made with a marking punch fixed relative to the frame during marking, the ribbon is conventionally fixed facing the punch during marking, the part to be marked being moved in contact with the punch, so as to compress the ribbon between the punch and its peripheral surface.
  • the tape then undergoes deformation stresses at the time of its rewinding which, for a small width of the tape and a high marking rate, are likely to degrade the tape.
  • US-A-3,718,517 on which is based the preamble of claim 1, describes a hot stamping machine for marking at least partially cylindrical parts.
  • the machine comprises a turntable provided with six mandrels, each intended to receive a part.
  • the machine also comprises two marking heads, each marking head being movable in vertical and horizontal translation relative to the frame of the machine. For each marking head, marking is achieved by heating and compressing a respective tape between the marking head and the peripheral surface of a part to be marked.
  • the machine further comprises unwinding means for each ribbon and a drive cylinder of the two ribbons.
  • DE-U-94 20 707 discloses a hot stamping machine comprising a marking cylinder and a counter-cylinder, which delimit between them a marking space.
  • the marking cylinder is equipped with a marking die for pressing, in the marking space, a tape against a strip of material to be marked.
  • the running speed of the ribbon in the marking space is controlled by a rotary suction cylinder disposed upstream of the marking space. More specifically, the ribbon cooperates without sliding with the upstream rotary cylinder, whose rotation is controlled by a motor, and is pulled constantly by a pulling device disposed downstream of the marking space.
  • the upstream rotary cylinder is able to reduce or increase the speed of travel of the ribbon in the marking space with respect to the pulling speed imposed by the downstream drawing device.
  • Such control of the running speed of the ribbon by a motorized upstream rotary cylinder is effective when the ribbon scrolls continuously in the marking space, the scroll simply being accelerated or decelerated.
  • the use of a motorized rotary cylinder upstream of the marking space is no longer suitable . Indeed, the ribbon should then be accelerated quickly from zero speed.
  • the invention intends to remedy more particularly by proposing a marking machine with a fixed or mobile marking member, making it possible to obtain good reliability and good quality of marking, even for weak ribbon widths. and high marking rates.
  • the subject of the invention is a hot stamping machine, of the type comprising a marking member intended to press a tape against the peripheral surface of individual pieces for their marking, the individual pieces being positioned successively in a post marking and marked by repetition of a marking sequence for each piece, the machine comprising means for unwinding the ribbon, and means for rewinding the ribbon.
  • the rewinding means are intended to unwind a tape length sequentially at the end of each marking sequence for the next marking sequence.
  • the machine comprises a ribbon suction box and a ribbon braking surface, the braking surface having a fixed orientation relative to the machine frame during each marking sequence, the ribbon from the means of unwinding successively passing into the suction box, along the braking surface and facing the marking member, so that a reserve ribbon is available in the suction box between the unwinding means and the braking surface, while the ribbon is stretched facing the marking member between the braking surface and the rewinding means.
  • the marking machine 1 shown in Figures 1 to 4 , is intended for marking at least partially cylindrical parts 2, made of plastic material.
  • the parts 2 may be cosmetic product packages.
  • the machine 1 comprises a main frame 3, which supports an upper rail 4 substantially horizontal.
  • a heating head 5 marking is slidably mounted relative to the rail 4.
  • the marking head 5 is movable in translation relative to the frame 3, parallel to a longitudinal axis Y 4 of the rail 4, under the action of drive means not shown associated with a motor 40.
  • the marking head 5 is equipped with a flat punch 6, made of metal or silicone, which defines patterns to be marked on the pieces 2.
  • the marking of each piece 2 is achieved by heating and compressing a metallized ribbon 7 between the punch 6 and the outer peripheral surface 2A of the workpiece 2.
  • the machine 1 comprises a plate 8 rotating in the direction of the arrow F 1 of the figure 1 around an axis X 8 substantially horizontal and perpendicular to the axis Y 4 .
  • the plate 8 can rotate in the opposite direction to that shown on the figure 1 .
  • the plate 8 is as described in the document EP-A-1,518,675 .
  • the plate 8 is provided with six cylindrical mandrels 9 of circular section, intended to each receive a part 2. Each mandrel 9 is rotatably mounted on a support 10, about an axis X 9 substantially parallel to the axis X 8 .
  • the mandrels 9 can occupy successively six separate positions.
  • the upper position, occupied by the chuck noted 9A on the Figures 1 to 4 corresponds to a marking station of the part 2 mounted on the mandrel 9A.
  • the station located on the left of the marking station, which is occupied by the mandrel noted 9B on the Figures 1 to 4 may correspond to a locating station of one or more particular points of the part 2 mounted on the mandrel 9B, for example by means of a not shown marker camera.
  • the other stations may correspond to loading and unloading stations of parts 2 compared to mandrels 9.
  • each mandrel 9 is supported by rails 11.
  • the support 10 of this mandrel is able to slide vertically along the rails 11 relative to the plate 8 and the frame 3, as shown by the arrow F 2 of the figure 1 .
  • each mandrel 9 is able, when it is at the marking station, to move the part 2 that it supports with respect to the frame 3, both in rotation about the axis Xg and in translation parallel to an axis vertical Z.
  • the sliding of the support 10 relative to the rails 11 is not allowed and the support 10 is immobilized near the center of the plate 8.
  • the figure 1 shows the arrangement of the constituent elements of the machine 1 prior to the marking of the part 2 carried by the mandrel 9A at the marking station.
  • the ribbon 7 then extends opposite the punch 6, between a flange 12 unwinding the ribbon 7 and a flange 17 rewinding the ribbon 7.
  • upstream and downstream refer to the meaning running the ribbon 7 on the machine 1, from the flange 12 to the flange 17.
  • the unwinding flange 12 is associated with a motorized driving cylinder 13, disposed downstream of the flange 12 and able to actuate by its rotation the unwinding of the ribbon 7 relative to the flange 12, the ribbon 7 being pressed against the driving cylinder 13 by a
  • the rewinding flange 17 is associated with a motorized driving cylinder 16 disposed upstream of the flange 17 and against which the ribbon 7 is pressed by means of a pressure roller 15, so that the rotation of the driving cylinder 16 actuates the rewinding of the ribbon 7 around the flange 17.
  • the motors equipping the driving cylinders 13 and 16 are brushless type motors, adapted to be selectively controlled by a control unit not shown in FIG. the machine 1, depending on the desired unwinding and rewinding of the ribbon 7.
  • the machine 1 comprises a suction box 18, arranged vertically above the unwinding means 12-14.
  • the box suction device 18 is provided for sucking the tape 7 at the exit of the unwinding means 12-14, so that the ribbon 7 forms a bend inside the box 18.
  • the machine 1 comprises a cylinder brake 19 defining a braking surface 19A disposed in the vicinity of the punch 6 and around which the ribbon 7 is partially wound at the outlet of the suction box 18.
  • the braking surface 19A formed by the braking cylinder 19 is fixed in rotation relative to the frame 3 of the machine 1 during each marking sequence.
  • the machine 1 also comprises five 20-24 cylindrical strippers, the ribbon 7 passing around the strippers 20 and 21 between the suction box 18 and the brake cylinder 19, and around the strippers 22, 23 and 24 between the brake cylinder 19 and the rewinding means 15-17.
  • the brake cylinder 19, the strippers 23 and 24 and the rewinding means 15-17 are embarked with the marking head 5, that is to say are moved in translation parallel to the axis longitudinal Y 4 of the rail 4 at the same time as the marking head 5, under the action of the drive means associated with the motor 40.
  • the suction box 18 is substantially parallelepipedic and delimited by a bottom wall 181, from which extend two side walls 183 opposite and two front and rear walls 185 opposite.
  • a fan 182 is provided to create a vacuum inside the box 18, so as to produce a suction effect of the ribbon 7 towards the inside of the box 18.
  • the ribbon 7 enters the box 18 through a opening 184 of the box 18, opposite to the bottom wall 181.
  • Two strippers 186 arranged in the vicinity of the opening 184, are intended to confine the ribbon 7 sucked inside the box 18 against the two side walls 183 opposite.
  • the ribbon 7 is not taut, just enough to withstand its own weight between the elements 12-14, on the one hand, and the braking surface 19A , on the other hand.
  • the tension of the ribbon 7 between the elements 12-14 and the surface 19A is called the proper tension of the ribbon 7.
  • the suction box 18 also has an internal wall, not visible in the figures, which is parallel to the front and rear walls 185 and slidably movable inside the box 18, parallel to these walls 185.
  • the depth of the suction box 18 available for the ribbon 7 can thus be modulated according to the width of the ribbon 7 used, so as to guarantee its confinement between the side walls 183, the front wall 185 and the inner wall of the ribbon. suction box 18.
  • the positioning of the ribbon 7 inside the suction box 18 is thus perfectly determined, which is particularly advantageous in the case of a ribbon 7 of small width, easily movable under the effect vibrations or other disturbances occurring on the machine 1.
  • the wall portions of the suction box 18 intended to be in contact with the ribbon 7 are made of aluminum.
  • these wall portions may be made of any other material unlikely to be electrified due to friction with the ribbon 7.
  • the box 18 may be made of a transparent material, such as polycarbonate or plexiglass coated internally with Teflon or aluminum at the walls of contact with the ribbon 7.
  • the suction box 18 is also equipped with a detection cell 188, intended to detect the presence of the ribbon 7 in its field of vision.
  • the cell 188 is disposed at a side opening 189 of the box 18, a glass wall of the cell 188 closing the opening 189.
  • the signal from the cell 188 is advantageously transmitted to the brushless motor associated with the driving cylinder 13 , so that the unwinding of the ribbon 7 is stopped when the cell 188 detects the presence of the ribbon 7.
  • the dimensions of the box 18 and the positioning of the cell 188 are adapted so as to guarantee a sufficient reserve of tape 7 inside the box 18 for each marking sequence.
  • the detection cell 188 may be replaced by a distance measuring cell disposed at the bottom wall 181 of the box 18. Such a cell is then also connected to the brushless motor associated with the driving cylinder 13, of such so that a sufficient reserve of ribbon 7 is available inside the box 18 for each marking sequence.
  • the cell 188 may also be associated with a second detection cell with a minimum length of ribbon 7 inside the box 18, connected to the brushless motor equipping the drive cylinder 13 so that the unwinding of the ribbon 7 is actuated. when this second cell no longer detects the presence of the ribbon 7. A minimum length of ribbon 7 can thus be maintained inside the suction box 18.
  • the brushless motor equipping the drive cylinder 13 tape unwinding 7 may be replaced by an asynchronous motor associated with a control unit adapted to process the information from the detection cell 188 and regulate the output speed of the asynchronous motor based on this information.
  • the motorization of the uncoiling means can also be directly associated with the unwinding plate 12, the rotation speed at the motor output being adapted according to the information from the sensor cell and the unwinding state of the sensor. ribbon 7 with respect to the flange 12. In this latter variant, the presence of the drive roller 13 and the pressure roller 14 is no longer necessary.
  • the brake cylinder 19 visible on a larger scale on the Figures 5 and 6 , comprises a tubular casing 191, centered on an axis X 19 and in which is housed a hollow body 193 of substantially complementary shape to that of the casing 191.
  • a first end 191A of the casing 191 is provided with a nozzle connection to a source of depression, such as, by way of non-limiting examples, a Venturi pipe, a vacuum source or a fan, this end opening into the interior of the hollow body 193.
  • the second end 191B of the casing 191, opposite the end 191A, is closed by a corresponding end portion 193B of the body 193 fitted into the casing 191.
  • a depression can be created inside the body 193.
  • the casing 191 is provided with through orifices 192 on a portion 19A of its outer peripheral surface forming the braking surface of the cylinder 19, corresponding through apertures 194 being also provided in the body 193.
  • the orifices 194 are formed in two flats 195 of the body 193, which extend over an angular sector of apex angle substantially equal to that defined by the braking surface 19A.
  • the orifices 194 When the orifices 194 are disposed vertically above the orifices 192, the latter communicate with the interior of the body 193.
  • the ribbon 7 wound partially around the casing 191 of the cylinder 19 is retained against the surface 19A due to the suction generated at the openings 192.
  • the body 193 In order to modulate the suction force exerted by the braking surface 19A on the ribbon 7, the body 193 is able to rotate inside the casing 191 about the X axis 19 . It is thus possible to angularly offset the orifices 194 of the body 193 relative to the suction orifices 192 of the ribbon 7 to vary the flow of air through the orifices 192. In addition, it is possible to rotate the envelope 191 relative to the frame 3 of the machine 1 around the X axis 19 , so as to change the orientation of the braking surface 19A relative to the frame, for example in the context of an adjustment between two marking sequences . The interaction between the braking surface 19A and the ribbon 7 can thus be modified according to the marking characteristics, and in particular the profile of the parts to be marked.
  • the ribbon 7 can be tensioned in an adjustable manner, and without undesirable effects of inertia, between the surface 19A and the rewinding means 15. 17, regardless of the unwinding state of the ribbon 7 upstream of the surface 19A.
  • the combination of the suction box 18, disposed at the output of the motorized unwinding means 12-14, and the braking surface 19A thus makes it possible to supply a supply of ribbon 7 with a low voltage upstream of the braking surface 19A, while maintaining a ribbon tension 7 satisfactory for marking downstream of the braking surface 19A.
  • the punch 6 carried by the marking head 5 is moved in translation relative to the frame 3, parallel to the longitudinal axis Y 4 of the rail 4 and towards the workpiece 2 to mark, as shown by the arrow F 3 to figures 2 and 3 .
  • the brake cylinder 19, the strippers 23 and 24 and the rewinding means 15-17, which are integral in translation with the marking head 5, are then also moved parallel to the axis Y 4 .
  • the ribbon 7 is thus unwound out of the suction box 18 and scrolled relative to the frame 3 in the direction of the arrow F 4 of the figure 3 , with a speed equal to the translational speed of the punch 6 relative to the frame 3.
  • the part 2 is rotated about the axis X 9 of the mandrel 9A, in the direction of the arrow F 5 of the figure 3 .
  • the punch 6 comes into contact with the workpiece 2
  • the ribbon 7 is pressed, while being heated, against the outer peripheral surface 2A of the part 2 driven in rotation, which allows the marking of the workpiece 2.
  • a sliver of ribbon is advantageously provided, at beginning of the marking, by a return of the brushless motor associated with the rewinding means 15-17.
  • the punch 6 is on the left of the piece 2, as visible on the figure 4 .
  • the mandrel 9A which turns on itself about the axis X 9 , is then moved vertically towards the center of the plate 8, by sliding its support 10 along the rails 11 in the direction of the arrow F 6 of the figure 4 .
  • the plate 8 is pivoted in the direction of the arrow F 1 of the figure 1 , the synchronization of the movements of the mandrel 9A and the plate 8 being obtained by means of a control unit not shown.
  • the marking head 5 provided with the punch 6, the braking cylinder 19, the rewinding means 15-17 and the strippers 23 and 24 are then also moved to their initial position, by a translation parallel to the Y axis 4 in the direction of arrow F 7 of the figure 4 .
  • the used ribbon 7 is rewound around the rewinding flange 17, while a ribbon length is unwound with respect to the flange 12 and set aside for another marking sequence, by actuating the engine associated with the cylinder 13.
  • the heated strip 7 tends to adhere with respect to the surface 2A of the part 2 carried by the mandrel 9A.
  • the ribbon 7 thus undergoes a slight pull in the direction of movement of the workpiece.
  • This traction of the ribbon 7 at the end of the marking generates a disruptive sliver of tape 7 between the braking surface 19A and the rewinding means 15-17.
  • This ribbon disordering slack 7 is resumed during the rewinding of the tape 7 consecutive marking.
  • this slack disordering slack 7 can also be resumed by momentarily deactivating the suction of the braking surface 19A, so that the disturbing slack is swallowed in the suction box 18.
  • the turntable 8 has, by its rotation in the direction of the arrow F 1 of the figure 1 positioned the mandrel 9B at the marking station.
  • the marking of the part 2 carried by the mandrel 9B is obtained by repeating the previously described steps for the marking of the part 2 carried by the mandrel 9A.
  • the guidance of the ribbon 7 on the machine 1 according to this first embodiment of the invention makes it possible to mark each part 2 with good reliability and good marking quality, even for a width of the ribbon 7 low, in particular between about 8 mm and 25 mm, and a high marking rate, for example greater than 3000 pieces per hour, in particular greater than 6000 pieces per hour, produced with a single marking head.
  • the combination of the suction box 18, disposed at the output of the motorized unwinding means 12-14, and the braking surface 19A makes it possible to guarantee a satisfactory tension of the strip 7 opposite the punch 6, adapted to its function.
  • the tension of the ribbon 7 is satisfactory for marking when it allows height guidance and lateral guidance of the ribbon.
  • the marking machine 201 complies with this second embodiment comprises a heating head 205 marking, fixed relative to a frame 203 of the machine 201.
  • a marking wheel 206 silicone is rotatably mounted on the marking head 205, about an axis X 206 substantially horizontal and perpendicular to the plane of the figure 7 .
  • the wheel 206 bears reliefs to mark on parts at least partially cylindrical 202, the marking of each piece 202 being made by heating and compression of a metallized strip 207 between the wheel 206 and the outer peripheral surface 202A of the part 202.
  • the machine 201 comprises a turntable 208, similar to the plate 8 of the first embodiment and designed to rotate between two marking sequences around an axis X 208 substantially parallel to the axis X 206 .
  • the plate 208 is provided with six cylindrical mandrels 209 of circular section, intended to each receive a part 202.
  • Each mandrel 209 is rotatably mounted on a support 210, about a substantially parallel axis X 209 to the X axes 206 and X 208 , each support 210 being supported by rails 211.
  • a mandrel 209 is only allowed when the mandrel 209 is in the vicinity of a marking station, which is occupied by the chuck 209A on the figure 7 .
  • a mandrel 209 is able to move the part 202 which it carries relative to the frame 203, both in rotation about the axis X 209 and in translation parallel to a vertical axis Z.
  • the figure 7 shows the arrangement of the constituent elements of the machine 201 prior to the marking of the part 202 carried by the mandrel 209A at the marking station.
  • the wheel 206 is then disposed vertically above this part 202, the ribbon 207 extending between the wheel 206 and the part 202, from motorized means for unwinding the ribbon 207, comprising a flange 212 unwinding, a driving cylinder 213 and a pressure roller 214, to motorized tape rewinding means 207, comprising a rewinding flange 217, a driving cylinder 216 and a pressure roller 215, similarly to the first embodiment.
  • the machine 201 also includes a suction box 218, disposed vertically above the unwinding means 212-214, and a brake cylinder 219 defining a braking surface 219A disposed in the vicinity of the wheel 206 and around which the ribbon 207 is wound partially in the outlet of the suction box 218.
  • the braking surface 219A formed by the braking cylinder 219 is fixed in rotation relative to the frame 203 of the machine during each sequence of marking.
  • the course of the tape 207 is also guided by unreferenced strippers, the set of means 212-219 for managing the ribbon 207 being fixed relative to the frame 203 of the machine 201.
  • the combination of the suction box 218, disposed at the output of the motorized unwinding means 212-214, and the braking surface 219A is intended to provide a supply of tape 207 without any voltage other than its own voltage upstream of the braking surface 219A while maintaining a ribbon tension 207 satisfactory for marking downstream of the braking surface 219A.
  • the suction box 218 and the braking surface 219A do not introduce any undesirable inertia effect.
  • Ribbon scrolling 207 results from the unwinding of the tape 207 out of the suction box 208 and the rewinding of the tape by the rewinding means 215-217.
  • a supply of ribbon without tension other than its own tension is maintained in the suction box 218 for each marking sequence, similarly to the first embodiment.
  • the ribbon 207, interposed between the wheel 206 and the part 202, is pressed, while being heated, between the peripheral surface of the wheel 206 and the peripheral surface 202A of the part 202 driven in rotation, which allows the marking of the room 202.
  • a sliver of ribbon is advantageously provided, at the beginning of the marking, by generating a delay in the draw of the ribbon 207 or a temporary stopping of the ribbon draw 207 by the rewinding means 215-217, with the aid of an appropriate engine control associated with the means 215-217.
  • the mandrel 209A which rotates about itself about the axis X 209 , is moved vertically towards the center of the plate 208, by sliding its support 210 along the rails 211, which distances the part 202 of the wheel 206.
  • the plate 208 is also pivoted, the synchronization of the movements of the mandrel 209A and the plate 208 being obtained by means of a not shown control unit.
  • the heated ribbon 207 tends to adhere with respect to the surface 202A of the workpiece 202.
  • the tape 207 thus undergoes a slight pull in the direction of movement of the workpiece.
  • This traction of the tape 207 at the end of the marking generates a ribbon disruptive slime 207 between the braking surface 219A and the rewinding means 215-217.
  • This disruptive tape slack 207 is resumed by momentarily deactivating the suction of the braking surface 219A, so that the disturbing slack is swallowed in the suction box 218.
  • the turntable 208 has, by its rotation, positioned another mandrel 209 at the marking station.
  • a marking machine thus makes it possible to mark parts with good reliability and good quality of marking, even for a small width of the tape used and a high marking rate.
  • the suction box disposed at the output of motorized unwinding means, and the braking surface.
  • the reserve of ribbon with a low voltage formed inside the suction box makes it possible to overcome the inertia proper to the unwinding means and to obtain a scroll with a substantially constant tension of the ribbon opposite the marking member, while the braking surface is necessary to ensure a satisfactory tension of the ribbon portion passing next to the marking member.
  • This ribbon tension is obtained without undesirable inertia effects, unlike the tension that would be obtained with a constant tension device, such as a spring-loaded mixing arm.
  • a marking machine comprising a suction box disposed at the output of motorized unwinding means and a braking surface
  • the supply of ribbon in the suction box has a relatively low first voltage
  • the ribbon has a second voltage higher than the first voltage between the braking surface and the rewinding means, this second voltage being satisfactory for marking parts.
  • the suction box and the braking surface do not introduce any undesirable inertia effect.
  • a hot stamping machine comprising a suction box disposed at the output of motorized unwinding means and a braking surface, can be applied to the marking of non-circular cross section pieces, the profile and the kinematics of supporting mandrels of such parts being adapted accordingly.
  • a marking machine according to the invention can also be implemented with individual chucks, which are not integrated on a turntable as described above and ensure proper movement of parts to mark.
  • the kinematics imparted to the elements of the marking machine may be different from that described and shown.
  • the punch in the case of a flat punch, the punch can be fixed in translation relative to the frame of the machine during marking, the piece to be marked then being moved both in rotation and in translation relative to the punch during marking.
  • the combination of the suction box and the braking surface is then used to reduce the deformation stresses experienced by the ribbon during its rapid rewinding, in the case of high marking rates.
  • the movement of contacting the marking member with a part to be marked can be supported by the marking member, and not by the support chuck of the piece.
  • the marking member 6 or 206 can thus be provided to move vertically, the vertical movement of the mandrels 9 or 209 then no longer necessary.
  • the various elements 12-19 management of the ribbon can be embedded or not with the punch, independently from each other or simultaneously. It can thus be envisaged that only the braking surface is embarked with the punch in the first embodiment, while the rewinding means 15-17 are fixed relative to the frame of the machine. Conversely, it is possible to embark only the rewinding means 15-17 with the punch, the braking surface being kept fixed.
  • the unwinding means 12-14 and the suction box 18 can also be embarked with the punch when the braking surface is itself embarked.
  • Scrolling tape next to the punch is adapted to each configuration, by appropriate programming of the means of unwinding and rewinding ribbon.
  • the tape running sequence during a marking sequence with a plane punch is, for a machine configuration marking in which the unwinding means 12-14 and rewinding 15-17 of the tape are fixed relative to the frame of the machine, the same as that described in the second embodiment involving the marking wheel 206.
  • the relative position of the ribbon guiding elements shown in the first and second embodiments may also be modified, the suction box may for example be arranged horizontally relative to the uncoiling means, or below these means of unwinding.
  • the braking surface of the ribbon formed by the braking cylinder in the examples described, may also be of any shape other than a portion of a cylinder, in particular a plane.
  • this braking surface can be integrated inside the suction box, being formed for example by a wall of the suction box. Such an arrangement is more compact and reduces the size of the marking machine.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Labeling Devices (AREA)
  • Auxiliary Devices For And Details Of Packaging Control (AREA)
  • Making Paper Articles (AREA)
  • Duplication Or Marking (AREA)
  • Treatment Of Fiber Materials (AREA)

Description

La présente invention a trait à une machine de marquage à chaud, du type comprenant un organe de marquage destiné à presser un ruban contre la surface périphérique de pièces individuelles pour leur marquage.The present invention relates to a hot stamping machine, of the type comprising a marking member for pressing a tape against the peripheral surface of individual pieces for marking.

Dans le domaine du marquage, il est connu de réaliser des motifs décoratifs sur une pièce en matériau plastique, par exemple des liserés métallisés, au moyen d'une machine de marquage dans laquelle un ruban est pressé entre un organe de marquage chauffé comportant les motifs à réaliser sur la pièce et la surface périphérique de cette pièce. Lorsque les motifs à réaliser sont fins, la largeur du ruban utilisé pour le marquage est choisie la plus faible possible, afin de limiter la surface de ruban à mettre au rebut après chaque marquage et ainsi de réduire le coût associé au marquage. Or, la prise en charge d'un ruban de faible largeur sur une machine de marquage est délicate.In the field of marking, it is known to produce decorative patterns on a piece of plastic material, for example metallised borders, by means of a marking machine in which a ribbon is pressed between a heated marking member having the patterns to be made on the piece and the peripheral surface of this piece. When the patterns to be made are thin, the width of the ribbon used for the marking is chosen as low as possible, in order to limit the area of tape to be discarded after each marking and thus reduce the cost associated with marking. However, the management of a ribbon of small width on a marking machine is delicate.

Dans le cas d'un marquage avec un poinçon mobile en translation par rapport au bâti de la machine au cours du marquage, ou une roue de marquage, l'organe de marquage vient presser le ruban contre la surface périphérique de la pièce à marquer entraînée en rotation. De manière classique, le ruban est alors déplacé en regard de l'organe de marquage, par débobinage par rapport à un flasque de débobinage fixe par rapport au bâti de la machine et rembobinage sur un flasque de rembobinage également fixe par rapport au bâti de la machine, une tension appropriée du ruban étant obtenue entre ces deux flasques au moyen d'un dispositif de tension constante, tel qu'un bras batteur à ressort. Une bonne tension du ruban est d'autant plus importante pour un ruban de faible largeur, qui est particulièrement sensible aux vibrations ou autres perturbations susceptibles de modifier sa position par rapport à l'organe de marquage. Or, un dispositif de tension constante tel qu'un bras batteur génère, du fait de son inertie, et lorsque le ruban est de faible largeur et la cadence de marquage élevée, une avance saccadée du ruban en regard de l'organe de marquage, avec une variation de la tension du ruban. Une telle variation de la tension du ruban peut entraîner l'apparition de défauts de marquage sur les pièces.In the case of marking with a punch movable in translation relative to the frame of the machine during marking, or a marking wheel, the marking member is pressing the tape against the peripheral surface of the part to be marked driven in rotation. In a conventional manner, the ribbon is then moved opposite the marking member, by uncoiling with respect to a fixed unwinding flange relative to the frame of the machine and rewinding on a rewinding flange also fixed relative to the frame of the machine. machine, an appropriate tension of the ribbon being obtained between these two flanges by means of a constant tension device, such as a spring drumming arm. A good ribbon tension is all the more important for a ribbon of small width, which is particularly sensitive to vibrations or other disturbances likely to change its position relative to the marking member. However, a constant tension device such as a drummer arm generates, because of its inertia, and when the ribbon is of small width and the high marking rate, a jerky advance of the ribbon opposite the marking member, with a variation of the ribbon tension. Such a variation in the tension of the ribbon may cause the appearance of marking defects on the parts.

Lorsque le flasque de rembobinage du ruban est embarqué avec le poinçon mobile par rapport au bâti de la machine au cours du marquage, ou lorsque le marquage est réalisé avec un poinçon de marquage fixe par rapport au bâti au cours du marquage, le ruban est classiquement fixe en regard du poinçon lors du marquage, la pièce à marquer étant déplacée au contact du poinçon, de manière à comprimer le ruban entre le poinçon et sa surface périphérique. Le ruban subit alors des contraintes en déformation au moment de son rembobinage qui, pour une largeur faible du ruban et une cadence élevée de marquage, sont susceptibles de dégrader le ruban.When the ribbon rewinding flange is loaded with the mobile punch relative to the machine frame during marking, or when the marking is made with a marking punch fixed relative to the frame during marking, the ribbon is conventionally fixed facing the punch during marking, the part to be marked being moved in contact with the punch, so as to compress the ribbon between the punch and its peripheral surface. The tape then undergoes deformation stresses at the time of its rewinding which, for a small width of the tape and a high marking rate, are likely to degrade the tape.

US-A-3 718 517 , sur lequel est basé le préambule de la revendication 1, décrit une machine de marquage à chaud destinée au marquage de pièces au moins partiellement cylindriques. La machine comprend un plateau tournant pourvu de six mandrins, destinés à recevoir chacun une pièce. La machine comprend également deux têtes de marquage, chaque tête de marquage étant mobile en translation verticale et horizontale par rapport au bâti de la machine. Pour chaque tête de marquage, le marquage est réalisé par chauffage et compression d'un ruban respectif entre la tête de marquage et la surface périphérique d'une pièce à marquer. La machine comprend en outre des moyens de débobinage pour chaque ruban et un cylindre d'entraînement des deux rubans. US-A-3,718,517 , on which is based the preamble of claim 1, describes a hot stamping machine for marking at least partially cylindrical parts. The machine comprises a turntable provided with six mandrels, each intended to receive a part. The machine also comprises two marking heads, each marking head being movable in vertical and horizontal translation relative to the frame of the machine. For each marking head, marking is achieved by heating and compressing a respective tape between the marking head and the peripheral surface of a part to be marked. The machine further comprises unwinding means for each ribbon and a drive cylinder of the two ribbons.

Par ailleurs, DE-U-94 20 707 décrit une machine de marquage à chaud comprenant un cylindre de marquage et un contre-cylindre, qui délimitent entre eux un espace de marquage. Le cylindre de marquage est équipé d'une matrice de marquage destinée à presser, dans l'espace de marquage, un ruban contre une bande de matériau à marquer. Dans ce dispositif, la vitesse de défilement du ruban dans l'espace de marquage est contrôlée par un cylindre aspirant rotatif, disposé en amont de l'espace de marquage. Plus précisément, le ruban coopère sans glissement avec le cylindre rotatif amont, dont la rotation est commandée par un moteur, et est tiré de manière constante par un dispositif de tirage disposé en aval de l'espace de marquage. Ainsi, en fonction de sa vitesse de rotation, le cylindre rotatif amont est apte à diminuer ou à augmenter la vitesse de défilement du ruban dans l'espace de marquage par rapport à la vitesse de tirage imposée par le dispositif de tirage aval. Un tel contrôle de la vitesse de défilement du ruban par un cylindre rotatif amont motorisé est efficace lorsque le ruban défile en continu dans l'espace de marquage, le défilement étant simplement accéléré ou décéléré. Toutefois, lorsque le défilement du ruban doit s'opérer de manière séquentielle, comme c'est le cas pour le marquage de pièces individuelles, l'utilisation d'un cylindre rotatif motorisé en amont de l'espace de marquage n'est plus adaptée. En effet, le ruban devrait alors être accéléré rapidement à partir d'une vitesse nulle. L'expérience montre alors qu'un entraînement du ruban, notamment d'un ruban de faible largeur, par un cylindre rotatif motorisé disposé en amont de l'espace de marquage conduirait soit à l'apparition de défauts de marquage sur les pièces, du fait d'une vitesse trop importante du ruban conduisant à une accumulation de ruban au niveau de l'organe de marquage lors du marquage, soit à la rupture du ruban, du fait d'une vitesse insuffisante du ruban conduisant à une mise sous tension excessive de celui-ci. En effet, il serait en pratique délicat, voire impossible, de synchroniser parfaitement la vitesse de rotation du cylindre rotatif avec les déplacements des pièces amenées successivement en regard de l'organe de marquage.Otherwise, DE-U-94 20 707 discloses a hot stamping machine comprising a marking cylinder and a counter-cylinder, which delimit between them a marking space. The marking cylinder is equipped with a marking die for pressing, in the marking space, a tape against a strip of material to be marked. In this device, the running speed of the ribbon in the marking space is controlled by a rotary suction cylinder disposed upstream of the marking space. More specifically, the ribbon cooperates without sliding with the upstream rotary cylinder, whose rotation is controlled by a motor, and is pulled constantly by a pulling device disposed downstream of the marking space. Thus, depending on its speed of rotation, the upstream rotary cylinder is able to reduce or increase the speed of travel of the ribbon in the marking space with respect to the pulling speed imposed by the downstream drawing device. Such control of the running speed of the ribbon by a motorized upstream rotary cylinder is effective when the ribbon scrolls continuously in the marking space, the scroll simply being accelerated or decelerated. However, when the running of the tape must occur sequentially, as is the case for the marking of individual parts, the use of a motorized rotary cylinder upstream of the marking space is no longer suitable . Indeed, the ribbon should then be accelerated quickly from zero speed. Experience shows that a drive of the ribbon, in particular a ribbon of small width, by a motorized rotary cylinder disposed upstream of the marking space would lead either to the appearance of marking defects on the parts, the due to a too high speed of the ribbon leading to an accumulation of ribbon at the marking member during marking, or to the breaking of the ribbon, due to insufficient speed of the ribbon leading to excessive tensioning of it. Indeed, it would be in practice difficult, if not impossible, to perfectly synchronize the speed of rotation of the rotary cylinder with the movements of the parts successively brought opposite the marking member.

C'est à ces inconvénients qu'entend plus particulièrement remédier l'invention en proposant une machine de marquage à organe de marquage fixe ou mobile, permettant d'obtenir une bonne fiabilité et une bonne qualité du marquage, même pour des largeurs de ruban faibles et des cadences de marquage élevées.It is these drawbacks that the invention intends to remedy more particularly by proposing a marking machine with a fixed or mobile marking member, making it possible to obtain good reliability and good quality of marking, even for weak ribbon widths. and high marking rates.

A cet effet, l'invention a pour objet une machine de marquage à chaud, du type comprenant un organe de marquage destiné à presser un ruban contre la surface périphérique de pièces individuelles pour leur marquage, les pièces individuelles étant positionnées successivement dans un poste de marquage et marquées par répétition d'une séquence de marquage pour chaque pièce, la machine comprenant des moyens de débobinage du ruban, et des moyens de rembobinage du ruban. Conformément à l'invention, les moyens de rembobinage sont destinés à débobiner une longueur de ruban de manière séquentielle à la fin de chaque séquence de marquage en vue de la séquence de marquage suivante. En outre, la machine comprend une boîte d'aspiration du ruban et une surface de freinage du ruban, la surface de freinage ayant une orientation fixe par rapport au bâti de la machine au cours de chaque séquence de marquage, le ruban issu des moyens de débobinage passant successivement dans la boîte d'aspiration, le long de la surface de freinage et en regard de l'organe de marquage, de telle sorte qu'une réserve de ruban est disponible dans la boîte d'aspiration entre les moyens de débobinage et la surface de freinage, alors que le ruban est tendu en regard de l'organe de marquage entre la surface de freinage et les moyens de rembobinage.For this purpose, the subject of the invention is a hot stamping machine, of the type comprising a marking member intended to press a tape against the peripheral surface of individual pieces for their marking, the individual pieces being positioned successively in a post marking and marked by repetition of a marking sequence for each piece, the machine comprising means for unwinding the ribbon, and means for rewinding the ribbon. According to the invention, the rewinding means are intended to unwind a tape length sequentially at the end of each marking sequence for the next marking sequence. In addition, the machine comprises a ribbon suction box and a ribbon braking surface, the braking surface having a fixed orientation relative to the machine frame during each marking sequence, the ribbon from the means of unwinding successively passing into the suction box, along the braking surface and facing the marking member, so that a reserve ribbon is available in the suction box between the unwinding means and the braking surface, while the ribbon is stretched facing the marking member between the braking surface and the rewinding means.

Selon d'autres caractéristiques avantageuses de l'invention, prises isolément ou selon toutes les combinaisons techniquement possibles :

  • la surface de freinage est une surface percée d'orifices d'aspiration du ruban ;
  • la surface de freinage est formée par un cylindre de freinage autour duquel le ruban s'enroule partiellement ;
  • le cylindre de freinage comporte une enveloppe externe formant la surface de freinage et un corps interne creux, logé dans l'enveloppe et relié à une source de dépression, l'enveloppe étant percée d'orifices d'aspiration du ruban au niveau de la surface de freinage, propres à communiquer avec l'intérieur du corps creux à travers des orifices correspondants du corps, les orifices du corps étant aptes à être décalés angulairement par rapport aux orifices de l'enveloppe, de manière à moduler l'effort d'aspiration exercé par la surface de freinage sur le ruban ;
  • les moyens de débobinage sont motorisés, la machine comprenant des moyens de détection de la longueur de ruban disponible entre les moyens de débobinage et la surface de freinage, ces moyens de détection étant reliés à la motorisation des moyens de débobinage de manière à moduler la longueur de ruban précitée ;
  • la boîte d'aspiration comporte des moyens de confinement du ruban contre des parois intérieures de la boîte d'aspiration ;
  • l'organe de marquage est fixe en translation par rapport au bâti de la machine au cours du marquage d'une pièce, la machine comprenant des moyens de déplacement de la pièce par rapport à l'organe de marquage, qui la déplacent au moins en rotation autour d'un axe au cours du marquage ;
  • l'organe de marquage est mobile en translation parallèlement à un axe par rapport au bâti de la machine au cours du marquage d'une pièce, la machine comprenant des moyens de déplacement de la pièce par rapport à l'organe de marquage, qui la déplacent uniquement en rotation autour d'un axe au cours du marquage ;
  • la surface de freinage a un mouvement de translation par rapport au bâti de la machine identique à celui de l'organe de marquage au cours du marquage d'une pièce ;
  • les moyens de rembobinage ont un mouvement de translation par rapport au bâti de la machine identique à celui de l'organe de marquage au cours du marquage d'une pièce ;
  • l'organe de marquage est un poinçon plan ou une roue de marquage.
According to other advantageous features of the invention, taken separately or in any technically possible combination:
  • the braking surface is a surface pierced with suction openings of the ribbon;
  • the braking surface is formed by a braking cylinder around which the ribbon is partially wound;
  • the brake cylinder comprises an outer casing forming the braking surface and a hollow internal body, housed in the casing and connected to a vacuum source, the casing being pierced with suction openings of the ribbon at the surface; braking, adapted to communicate with the interior of the hollow body through the corresponding orifices of the body, the orifices of the body being able to be offset angularly relative to the orifices of the envelope, so as to modulate the suction force exerted by the braking surface on the ribbon;
  • the unwinding means are motorized, the machine comprising means for detecting the length of ribbon available between the unwinding means and the braking surface, these detection means being connected to the motorization of the uncoiling means so as to modulate the length aforementioned ribbon;
  • the suction box comprises means for confining the ribbon against the inner walls of the suction box;
  • the marking member is fixed in translation relative to the frame of the machine during the marking of a workpiece, the machine comprising means for moving the workpiece relative to the marking member, which move at least rotation about an axis during marking;
  • the marking member is movable in translation parallel to an axis relative to the frame of the machine during the marking of a workpiece, the machine comprising means for moving the workpiece relative to the marking member, which the move only in rotation about an axis during marking;
  • the braking surface has a translation movement relative to the frame of the machine identical to that of the marking member during the marking of a workpiece;
  • the rewinding means have a translation movement relative to the frame of the machine identical to that of the marking member during the marking of a workpiece;
  • the marking member is a flat punch or a marking wheel.

Les caractéristiques et avantages de l'invention apparaîtront dans la description qui va suivre de deux modes de réalisation d'une machine de marquage selon l'invention, donnée uniquement à titre d'exemple et faite en se référant aux dessins annexés dans lesquels :

  • la figure 1 est une vue de face d'une machine de marquage conforme à un premier mode de réalisation de l'invention, entre deux séquences de marquage ;
  • la figure 2 est une vue analogue à la figure 1, lors d'une première étape d'une séquence de marquage ;
  • la figure 3 est une vue analogue à la figure 1, lors d'une deuxième étape d'une séquence de marquage ;
  • la figure 4 est une vue analogue à la figure 1, lors d'une troisième étape d'une séquence de marquage ;
  • la figure 5 est une coupe à plus grande échelle d'un cylindre de freinage de la machine de marquage représentée sur les figures 1 à 4 ;
  • la figure 6 est une vue en perspective éclatée du cylindre de freinage de la figure 5 ; et
  • la figure 7 est une vue analogue à la figure 1 pour une machine de marquage conforme à un deuxième mode de réalisation de l'invention.
The characteristics and advantages of the invention will appear in the following description of two embodiments of a marking machine according to the invention, given solely by way of example and with reference to the appended drawings in which:
  • the figure 1 is a front view of a marking machine according to a first embodiment of the invention, between two marking sequences;
  • the figure 2 is a view similar to the figure 1 during a first step of a marking sequence;
  • the figure 3 is a view similar to the figure 1 in a second step of a labeling sequence;
  • the figure 4 is a view similar to the figure 1 in a third step of a labeling sequence;
  • the figure 5 is a larger-scale section of a brake cylinder of the marking machine shown on the Figures 1 to 4 ;
  • the figure 6 is an exploded perspective view of the brake cylinder of the figure 5 ; and
  • the figure 7 is a view similar to the figure 1 for a marking machine according to a second embodiment of the invention.

La machine de marquage 1, représentée aux figures 1 à 4, est destinée au marquage de pièces 2 au moins partiellement cylindriques, constituées en matériau plastique. A titre d'exemple non limitatif, les pièces 2 peuvent être des emballages de produit cosmétique. La machine 1 comprend un bâti principal 3, qui supporte un rail supérieur 4 sensiblement horizontal. Une tête chauffante 5 de marquage est montée coulissante par rapport au rail 4. La tête de marquage 5 est mobile en translation par rapport au bâti 3, parallèlement à un axe longitudinal Y4 du rail 4, sous l'action de moyens d'entraînement non représentés associés à un moteur 40. La tête de marquage 5 est équipée d'un poinçon plan 6, constitué en métal ou en silicone, qui définit des motifs à marquer sur les pièces 2. Le marquage de chaque pièce 2 est réalisé par chauffage et compression d'un ruban métallisé 7 entre le poinçon 6 et la surface périphérique externe 2A de la pièce 2.The marking machine 1, shown in Figures 1 to 4 , is intended for marking at least partially cylindrical parts 2, made of plastic material. By way of non-limiting example, the parts 2 may be cosmetic product packages. The machine 1 comprises a main frame 3, which supports an upper rail 4 substantially horizontal. A heating head 5 marking is slidably mounted relative to the rail 4. The marking head 5 is movable in translation relative to the frame 3, parallel to a longitudinal axis Y 4 of the rail 4, under the action of drive means not shown associated with a motor 40. The marking head 5 is equipped with a flat punch 6, made of metal or silicone, which defines patterns to be marked on the pieces 2. The marking of each piece 2 is achieved by heating and compressing a metallized ribbon 7 between the punch 6 and the outer peripheral surface 2A of the workpiece 2.

La machine 1 comprend un plateau 8 tournant dans le sens de la flèche F1 de la figure 1, autour d'un axe X8 sensiblement horizontal et perpendiculaire à l'axe Y4. En variante, le plateau 8 peut tourner dans le sens inverse de celui représenté sur la figure 1. Le plateau 8 est tel que décrit dans le document EP-A-1 518 675 . Le plateau 8 est pourvu de six mandrins 9 cylindriques à section circulaire, destinés à recevoir chacun une pièce 2. Chaque mandrin 9 est monté rotatif sur un support 10, autour d'un axe X9 sensiblement parallèle à l'axe X8.The machine 1 comprises a plate 8 rotating in the direction of the arrow F 1 of the figure 1 around an axis X 8 substantially horizontal and perpendicular to the axis Y 4 . Alternatively, the plate 8 can rotate in the opposite direction to that shown on the figure 1 . The plate 8 is as described in the document EP-A-1,518,675 . The plate 8 is provided with six cylindrical mandrels 9 of circular section, intended to each receive a part 2. Each mandrel 9 is rotatably mounted on a support 10, about an axis X 9 substantially parallel to the axis X 8 .

Du fait de la rotation du plateau 8, les mandrins 9 peuvent occuper successivement six postes distincts. Le poste supérieur, occupé par le mandrin noté 9A sur les figures 1 à 4, correspond à un poste de marquage de la pièce 2 montée sur le mandrin 9A. Le poste disposé sur la gauche du poste de marquage, qui est occupé par le mandrin noté 9B sur les figures 1 à 4, peut correspondre à un poste de repérage d'un ou plusieurs points particuliers de la pièce 2 montée sur le mandrin 9B, par exemple au moyen d'une caméra de repérage non représentée. Le poste disposé sur la droite du poste de marquage, qui est occupé par le mandrin noté 9F sur les figures 1 à 4, peut quant à lui correspondre à un poste de contrôle du marquage de la surface périphérique 2A de la pièce 2 portée par le mandrin 9F, par exemple au moyen d'une caméra de contrôle également non représentée, le marquage ayant été réalisé lorsque le mandrin 9F était au poste de marquage. Enfin, les autres postes peuvent correspondre à des postes de chargement et de déchargement de pièces 2 par rapport aux mandrins 9.Due to the rotation of the plate 8, the mandrels 9 can occupy successively six separate positions. The upper position, occupied by the chuck noted 9A on the Figures 1 to 4 , corresponds to a marking station of the part 2 mounted on the mandrel 9A. The station located on the left of the marking station, which is occupied by the mandrel noted 9B on the Figures 1 to 4 , may correspond to a locating station of one or more particular points of the part 2 mounted on the mandrel 9B, for example by means of a not shown marker camera. The post located to the right of the marking station, which is occupied by the mandrel marked 9F on the Figures 1 to 4 it can correspond to a control station marking the peripheral surface 2A of the part 2 carried by the mandrel 9F, for example by means of a control camera also not shown, the marking having been made when the mandrel 9F was at the marking station. Finally, the other stations may correspond to loading and unloading stations of parts 2 compared to mandrels 9.

Le support 10 de chaque mandrin 9 est supporté par des rails 11. Lorsqu'un mandrin 9 arrive au voisinage du poste de marquage, qui est occupé par le mandrin 9A sur les figures 1 à 4, le support 10 de ce mandrin est apte à coulisser verticalement le long des rails 11 par rapport au plateau 8 et au bâti 3, comme montré par la flèche F2 de la figure 1. Ainsi, chaque mandrin 9 est apte, lorsqu'il est au poste de marquage, à déplacer la pièce 2 qu'il supporte par rapport au bâti 3, à la fois en rotation autour de l'axe Xg et en translation parallèlement à un axe vertical Z. Lorsqu'un mandrin 9 est dans l'un des cinq autres postes, le coulissement du support 10 par rapport aux rails 11 n'est pas permis et le support 10 est immobilisé au voisinage du centre du plateau 8.The support 10 of each mandrel 9 is supported by rails 11. When a mandrel 9 arrives in the vicinity of the marking station, which is occupied by the mandrel 9A on the Figures 1 to 4 , the support 10 of this mandrel is able to slide vertically along the rails 11 relative to the plate 8 and the frame 3, as shown by the arrow F 2 of the figure 1 . Thus, each mandrel 9 is able, when it is at the marking station, to move the part 2 that it supports with respect to the frame 3, both in rotation about the axis Xg and in translation parallel to an axis vertical Z. When a mandrel 9 is in one of the other five positions, the sliding of the support 10 relative to the rails 11 is not allowed and the support 10 is immobilized near the center of the plate 8.

La figure 1 montre l'agencement des éléments constitutifs de la machine 1 préalablement au marquage de la pièce 2 portée par le mandrin 9A au poste de marquage. Le ruban 7 s'étend alors en regard du poinçon 6, entre un flasque 12 de débobinage du ruban 7 et un flasque 17 de rembobinage du ruban 7. Dans ce qui suit, les termes « amont » et « aval » se réfèrent au sens de défilement du ruban 7 sur la machine 1, depuis le flasque 12 vers le flasque 17.The figure 1 shows the arrangement of the constituent elements of the machine 1 prior to the marking of the part 2 carried by the mandrel 9A at the marking station. The ribbon 7 then extends opposite the punch 6, between a flange 12 unwinding the ribbon 7 and a flange 17 rewinding the ribbon 7. In what follows, the terms "upstream" and "downstream" refer to the meaning running the ribbon 7 on the machine 1, from the flange 12 to the flange 17.

Le flasque de débobinage 12 est associé à un cylindre entraîneur 13 motorisé, disposé en aval du flasque 12 et propre à actionner par sa rotation le débobinage du ruban 7 par rapport au flasque 12, le ruban 7 étant plaqué contre le cylindre entraîneur 13 par un galet presseur 14. De manière similaire, le flasque de rembobinage 17 est associé à un cylindre entraîneur 16 motorisé, disposé en amont du flasque 17 et contre lequel le ruban 7 est plaqué au moyen d'un galet presseur 15, de sorte que la rotation du cylindre entraîneur 16 actionne le rembobinage du ruban 7 autour du flasque 17. De manière avantageuse, les moteurs équipant les cylindres entraîneurs 13 et 16 sont des moteurs de type brushless, propres à être commandés de manière sélective par une unité de commande non représentée de la machine 1, en fonction du débobinage et du rembobinage souhaités du ruban 7.The unwinding flange 12 is associated with a motorized driving cylinder 13, disposed downstream of the flange 12 and able to actuate by its rotation the unwinding of the ribbon 7 relative to the flange 12, the ribbon 7 being pressed against the driving cylinder 13 by a In a similar manner, the rewinding flange 17 is associated with a motorized driving cylinder 16 disposed upstream of the flange 17 and against which the ribbon 7 is pressed by means of a pressure roller 15, so that the rotation of the driving cylinder 16 actuates the rewinding of the ribbon 7 around the flange 17. Advantageously, the motors equipping the driving cylinders 13 and 16 are brushless type motors, adapted to be selectively controlled by a control unit not shown in FIG. the machine 1, depending on the desired unwinding and rewinding of the ribbon 7.

La machine 1 comprend une boîte d'aspiration 18, disposée verticalement au-dessus des moyens de débobinage 12-14. La boîte d'aspiration 18 est prévue pour aspirer le ruban 7 à la sortie des moyens de débobinage 12-14, de telle sorte que le ruban 7 forme un coude à l'intérieur de la boîte 18. De plus, la machine 1 comprend un cylindre de freinage 19 définissant une surface de freinage 19A, disposé au voisinage du poinçon 6 et autour duquel le ruban 7 s'enroule partiellement à la sortie de la boîte d'aspiration 18. La surface de freinage 19A formée par le cylindre de freinage 19 est fixe en rotation par rapport au bâti 3 de la machine 1 au cours de chaque séquence de marquage. La machine 1 comprend également cinq décolleurs 20-24 cylindriques, le ruban 7 passant autour des décolleurs 20 et 21 entre la boîte d'aspiration 18 et le cylindre de freinage 19, et autour des décolleurs 22, 23 et 24 entre le cylindre de freinage 19 et les moyens de rembobinage 15-17. Dans ce mode de réalisation, le cylindre de freinage 19, les décolleurs 23 et 24 et les moyens de rembobinage 15-17 sont embarqués avec la tête de marquage 5, c'est-à-dire sont déplacés en translation parallèlement à l'axe longitudinal Y4 du rail 4 en même temps que la tête de marquage 5, sous l'action des moyens d'entraînement associés au moteur 40.The machine 1 comprises a suction box 18, arranged vertically above the unwinding means 12-14. The box suction device 18 is provided for sucking the tape 7 at the exit of the unwinding means 12-14, so that the ribbon 7 forms a bend inside the box 18. In addition, the machine 1 comprises a cylinder brake 19 defining a braking surface 19A disposed in the vicinity of the punch 6 and around which the ribbon 7 is partially wound at the outlet of the suction box 18. The braking surface 19A formed by the braking cylinder 19 is fixed in rotation relative to the frame 3 of the machine 1 during each marking sequence. The machine 1 also comprises five 20-24 cylindrical strippers, the ribbon 7 passing around the strippers 20 and 21 between the suction box 18 and the brake cylinder 19, and around the strippers 22, 23 and 24 between the brake cylinder 19 and the rewinding means 15-17. In this embodiment, the brake cylinder 19, the strippers 23 and 24 and the rewinding means 15-17 are embarked with the marking head 5, that is to say are moved in translation parallel to the axis longitudinal Y 4 of the rail 4 at the same time as the marking head 5, under the action of the drive means associated with the motor 40.

La boîte d'aspiration 18 est sensiblement parallélépipédique et délimitée par une paroi de fond 181, à partir de laquelle s'étendent deux parois latérales 183 en regard et deux parois avant et arrière 185 en regard. Un ventilateur 182 est prévu pour créer une dépression à l'intérieur de la boîte 18, de manière à produire un effet d'aspiration du ruban 7 vers l'intérieur de la boîte 18. Le ruban 7 pénètre dans la boîte 18 à travers une ouverture 184 inférieure de la boîte 18, opposée à la paroi de fond 181. Deux décolleurs 186, agencés au voisinage de l'ouverture 184, sont destinés à confiner le ruban 7 aspiré à l'intérieur de la boîte 18 contre les deux parois latérales 183 en regard. Entre les moyens de débobinage 12-14 et la surface de freinage 19A, le ruban 7 est peu tendu, de façon juste suffisante pour résister à son propre poids entre les éléments 12-14, d'une part, et la surface de freinage 19A, d'autre part. Dans ce qui suit, la tension du ruban 7 entre les éléments 12-14 et la surface 19A est dénommée tension propre du ruban 7.The suction box 18 is substantially parallelepipedic and delimited by a bottom wall 181, from which extend two side walls 183 opposite and two front and rear walls 185 opposite. A fan 182 is provided to create a vacuum inside the box 18, so as to produce a suction effect of the ribbon 7 towards the inside of the box 18. The ribbon 7 enters the box 18 through a opening 184 of the box 18, opposite to the bottom wall 181. Two strippers 186, arranged in the vicinity of the opening 184, are intended to confine the ribbon 7 sucked inside the box 18 against the two side walls 183 opposite. Between the unwinding means 12-14 and the braking surface 19A, the ribbon 7 is not taut, just enough to withstand its own weight between the elements 12-14, on the one hand, and the braking surface 19A , on the other hand. In what follows, the tension of the ribbon 7 between the elements 12-14 and the surface 19A is called the proper tension of the ribbon 7.

De manière avantageuse, la boîte d'aspiration 18 comporte également une paroi interne, non visible sur les figures, qui est parallèle aux parois avant et arrière 185 et déplaçable en coulissement à l'intérieur de la boîte 18, parallèlement à ces parois 185. La profondeur de la boîte d'aspiration 18 disponible pour le ruban 7 peut ainsi être modulée en fonction de la largeur du ruban 7 utilisé, de manière à garantir son confinement entre les parois latérales 183, la paroi avant 185 et la paroi interne de la boîte d'aspiration 18. Le positionnement du ruban 7 à l'intérieur de la boîte d'aspiration 18 est ainsi parfaitement déterminé, ce qui est particulièrement avantageux dans le cas d'un ruban 7 de faible largeur, facilement déplaçable sous l'effet de vibrations ou d'autres perturbations intervenant sur la machine 1.Advantageously, the suction box 18 also has an internal wall, not visible in the figures, which is parallel to the front and rear walls 185 and slidably movable inside the box 18, parallel to these walls 185. The depth of the suction box 18 available for the ribbon 7 can thus be modulated according to the width of the ribbon 7 used, so as to guarantee its confinement between the side walls 183, the front wall 185 and the inner wall of the ribbon. suction box 18. The positioning of the ribbon 7 inside the suction box 18 is thus perfectly determined, which is particularly advantageous in the case of a ribbon 7 of small width, easily movable under the effect vibrations or other disturbances occurring on the machine 1.

Dans ce mode de réalisation, les portions de parois de la boîte d'aspiration 18 prévues pour être en contact avec le ruban 7 sont constituées en aluminium. En variante, ces portions de parois peuvent être constituées en tout autre matériau peu susceptible d'être électrisé du fait de frottements avec le ruban 7. A titre d'exemple, la boîte 18 peut être constituée en un matériau transparent, tel que du polycarbonate ou du plexiglas, revêtu intérieurement de téflon ou d'aluminium au niveau des parois de contact avec le ruban 7. Un défilement satisfaisant du ruban 7 à l'intérieur de la boîte d'aspiration 18 est ainsi assuré, grâce à l'effet d'aspiration dû au ventilateur 182, sans risque de perturbations liées à l'apparition de charges électrostatiques à l'interface entre les parois de la boîte 18 et le ruban 7.In this embodiment, the wall portions of the suction box 18 intended to be in contact with the ribbon 7 are made of aluminum. Alternatively, these wall portions may be made of any other material unlikely to be electrified due to friction with the ribbon 7. For example, the box 18 may be made of a transparent material, such as polycarbonate or plexiglass coated internally with Teflon or aluminum at the walls of contact with the ribbon 7. A satisfactory scroll ribbon 7 inside the suction box 18 is ensured, thanks to the effect of suction due to the fan 182, without risk of disturbances due to the appearance of electrostatic charges at the interface between the walls of the box 18 and the ribbon 7.

La boîte d'aspiration 18 est également équipée d'une cellule de détection 188, destinée à détecter la présence du ruban 7 dans son champ de vision. Telle que représentée sur les figures 1 à 4, la cellule 188 est disposée au niveau d'une ouverture latérale 189 de la boîte 18, une paroi vitrée de la cellule 188 obturant l'ouverture 189. Le signal issu de la cellule 188 est avantageusement transmis au moteur brushless associé au cylindre entraîneur 13, de telle sorte que le débobinage du ruban 7 est stoppé lorsque la cellule 188 détecte la présence du ruban 7. Les dimensions de la boîte 18 et le positionnement de la cellule 188 sont adaptés de manière à garantir une réserve suffisante de ruban 7 à l'intérieur de la boîte 18 pour chaque séquence de marquage.The suction box 18 is also equipped with a detection cell 188, intended to detect the presence of the ribbon 7 in its field of vision. As represented on the Figures 1 to 4 , the cell 188 is disposed at a side opening 189 of the box 18, a glass wall of the cell 188 closing the opening 189. The signal from the cell 188 is advantageously transmitted to the brushless motor associated with the driving cylinder 13 , so that the unwinding of the ribbon 7 is stopped when the cell 188 detects the presence of the ribbon 7. The dimensions of the box 18 and the positioning of the cell 188 are adapted so as to guarantee a sufficient reserve of tape 7 inside the box 18 for each marking sequence.

En variante, la cellule de détection 188 peut être remplacée par une cellule de mesure de distance disposée au niveau de la paroi de fond 181 de la boîte 18. Une telle cellule est alors également reliée au moteur brushless associé au cylindre entraîneur 13, de telle sorte qu'une réserve suffisante de ruban 7 est disponible à l'intérieur de la boîte 18 pour chaque séquence de marquage. La cellule 188 peut également être associée à une deuxième cellule de détection d'une longueur minimale de ruban 7 à l'intérieur de la boîte 18, reliée au moteur brushless équipant le cylindre entraîneur 13 de telle sorte que le débobinage du ruban 7 est actionné lorsque cette deuxième cellule ne détecte plus la présence du ruban 7. Une longueur minimale de ruban 7 peut ainsi être maintenue à l'intérieur de la boîte d'aspiration 18. Selon une autre variante, le moteur brushless équipant le cylindre 13 d'entraînement du débobinage du ruban 7 peut être remplacé par un moteur asynchrone associé à une unité de commande propre à traiter les informations issues de la cellule de détection 188 et à réguler la vitesse de rotation en sortie du moteur asynchrone en fonction de ces informations. Dans une autre variante, la motorisation des moyens de débobinage peut également être associée directement au flasque de débobinage 12, la vitesse de rotation en sortie de moteur étant adaptée en fonction des informations issues de la cellule de détection et de l'état de débobinage du ruban 7 par rapport au flasque 12. Dans cette dernière variante, la présence du cylindre entraîneur 13 et du cylindre presseur 14 n'est plus nécessaire.In a variant, the detection cell 188 may be replaced by a distance measuring cell disposed at the bottom wall 181 of the box 18. Such a cell is then also connected to the brushless motor associated with the driving cylinder 13, of such so that a sufficient reserve of ribbon 7 is available inside the box 18 for each marking sequence. The cell 188 may also be associated with a second detection cell with a minimum length of ribbon 7 inside the box 18, connected to the brushless motor equipping the drive cylinder 13 so that the unwinding of the ribbon 7 is actuated. when this second cell no longer detects the presence of the ribbon 7. A minimum length of ribbon 7 can thus be maintained inside the suction box 18. According to another variant, the brushless motor equipping the drive cylinder 13 tape unwinding 7 may be replaced by an asynchronous motor associated with a control unit adapted to process the information from the detection cell 188 and regulate the output speed of the asynchronous motor based on this information. In another variant, the motorization of the uncoiling means can also be directly associated with the unwinding plate 12, the rotation speed at the motor output being adapted according to the information from the sensor cell and the unwinding state of the sensor. ribbon 7 with respect to the flange 12. In this latter variant, the presence of the drive roller 13 and the pressure roller 14 is no longer necessary.

Le cylindre de freinage 19, visible à plus grande échelle sur les figures 5 et 6, comporte une enveloppe 191 tubulaire, centrée sur un axe X19 et dans laquelle est logé un corps 193 creux, de forme sensiblement complémentaire de celle de l'enveloppe 191. Une première extrémité 191A de l'enveloppe 191 est pourvue d'un embout de raccordement à une source de dépression, telle que, à titre d'exemples non limitatifs, un tuyau Venturi, une source de vide ou un ventilateur, cet embout débouchant dans le volume intérieur du corps creux 193. La deuxième extrémité 191B de l'enveloppe 191, opposée à l'extrémité 191A, est obturée par une portion d'extrémité 193B correspondante du corps 193 emmanché dans l'enveloppe 191. Ainsi, une dépression peut être créée à l'intérieur du corps 193. Comme montré plus particulièrement sur la figure 6, l'enveloppe 191 est pourvue d'orifices traversants 192 sur une portion 19A de sa surface périphérique externe formant la surface de freinage du cylindre 19, des orifices traversants 194 correspondants étant également prévus dans le corps 193. Les orifices 194 sont ménagés dans deux méplats 195 du corps 193, qui s'étendent sur un secteur angulaire d'angle au sommet sensiblement égal à celui défini par la surface de freinage 19A. Lorsque les orifices 194 sont disposés à l'aplomb des orifices 192, ces derniers communiquent avec l'intérieur du corps 193. Ainsi, lorsqu'une dépression est créée à l'intérieur du corps 193, le ruban 7 enroulé partiellement autour de l'enveloppe 191 du cylindre 19 est retenu contre la surface 19A du fait de l'aspiration générée au niveau des orifices 192.The brake cylinder 19, visible on a larger scale on the Figures 5 and 6 , comprises a tubular casing 191, centered on an axis X 19 and in which is housed a hollow body 193 of substantially complementary shape to that of the casing 191. A first end 191A of the casing 191 is provided with a nozzle connection to a source of depression, such as, by way of non-limiting examples, a Venturi pipe, a vacuum source or a fan, this end opening into the interior of the hollow body 193. The second end 191B of the casing 191, opposite the end 191A, is closed by a corresponding end portion 193B of the body 193 fitted into the casing 191. Thus, a depression can be created inside the body 193. As shown more especially on the figure 6 , the casing 191 is provided with through orifices 192 on a portion 19A of its outer peripheral surface forming the braking surface of the cylinder 19, corresponding through apertures 194 being also provided in the body 193. The orifices 194 are formed in two flats 195 of the body 193, which extend over an angular sector of apex angle substantially equal to that defined by the braking surface 19A. When the orifices 194 are disposed vertically above the orifices 192, the latter communicate with the interior of the body 193. Thus, when a depression is created inside the body 193, the ribbon 7 wound partially around the casing 191 of the cylinder 19 is retained against the surface 19A due to the suction generated at the openings 192.

En vue de moduler l'effort d'aspiration exercé par la surface de freinage 19A sur le ruban 7, le corps 193 est apte à tourner à l'intérieur de l'enveloppe 191 autour de l'axe X19. Il est ainsi possible de décaler angulairement les orifices 194 du corps 193 par rapport aux orifices 192 d'aspiration du ruban 7 pour faire varier le flux d'air à travers les orifices 192. En outre, il est possible de faire tourner l'enveloppe 191 par rapport au bâti 3 de la machine 1 autour de l'axe X19, de manière à changer l'orientation de la surface de freinage 19A par rapport au bâti, par exemple dans le cadre d'un réglage entre deux séquences de marquage. L'interaction entre la surface de freinage 19A et le ruban 7 peut ainsi être modifiée en fonction des caractéristiques de marquage, et notamment du profil des pièces à marquer.In order to modulate the suction force exerted by the braking surface 19A on the ribbon 7, the body 193 is able to rotate inside the casing 191 about the X axis 19 . It is thus possible to angularly offset the orifices 194 of the body 193 relative to the suction orifices 192 of the ribbon 7 to vary the flow of air through the orifices 192. In addition, it is possible to rotate the envelope 191 relative to the frame 3 of the machine 1 around the X axis 19 , so as to change the orientation of the braking surface 19A relative to the frame, for example in the context of an adjustment between two marking sequences . The interaction between the braking surface 19A and the ribbon 7 can thus be modified according to the marking characteristics, and in particular the profile of the parts to be marked.

Grâce au freinage résultant de l'aspiration du ruban 7 au niveau de la surface 19A du cylindre 19, le ruban 7 peut être tendu de manière réglable, et sans effets d'inertie indésirables, entre la surface 19A et les moyens de rembobinage 15-17, quel que soit l'état de débobinage du ruban 7 en amont de la surface 19A. La combinaison de la boîte d'aspiration 18, disposée en sortie des moyens de débobinage 12-14 motorisés, et de la surface de freinage 19A permet donc de fournir une réserve de ruban 7 avec une faible tension en amont de la surface de freinage 19A, tout en maintenant une tension du ruban 7 satisfaisante pour le marquage en aval de la surface de freinage 19A.Thanks to the braking resulting from the suction of the ribbon 7 at the surface 19A of the cylinder 19, the ribbon 7 can be tensioned in an adjustable manner, and without undesirable effects of inertia, between the surface 19A and the rewinding means 15. 17, regardless of the unwinding state of the ribbon 7 upstream of the surface 19A. The combination of the suction box 18, disposed at the output of the motorized unwinding means 12-14, and the braking surface 19A thus makes it possible to supply a supply of ribbon 7 with a low voltage upstream of the braking surface 19A, while maintaining a ribbon tension 7 satisfactory for marking downstream of the braking surface 19A.

Une séquence de marquage d'une pièce 2 sur la machine 1, illustrée pour la pièce 2 portée par le mandrin 9A sur les figures 1 à 4, comprend des étapes dans lesquelles :

  • Tout d'abord, le support 10 du mandrin 9A coulisse le long des rails 11, dans le sens de la flèche F2 de la figure 1, de manière à atteindre la position visible sur la figure 2. Dans cette position, le poinçon 6 se trouve sur la droite de la pièce 2 portée par le mandrin 9A, la hauteur relative de la pièce 2 et du poinçon 6 étant adaptée de telle sorte que le poinçon 6, par un mouvement de translation en direction de la pièce 2 parallèlement à l'axe Y4, est apte à venir en contact avec la surface périphérique externe 2A de cette pièce 2 à marquer.
A sequence of marking of a part 2 on the machine 1, illustrated for the part 2 carried by the mandrel 9A on the Figures 1 to 4 , comprises steps in which:
  • First, the support 10 of the mandrel 9A slides along the rails 11, in the direction of the arrow F 2 of the figure 1 , so as to reach the position visible on the figure 2 . In this position, the punch 6 is on the right of the part 2 carried by the mandrel 9A, the relative height of the part 2 and the punch 6 being adapted so that the punch 6, by a translation movement in the direction of the part 2 parallel to the axis Y 4 , is adapted to come into contact with the outer peripheral surface 2A of this part 2 to be marked.

Lorsque le mandrin 9A a positionné la pièce 2 dans cette position, le poinçon 6 porté par la tête de marquage 5 est déplacé en translation par rapport au bâti 3, parallèlement à l'axe longitudinal Y4 du rail 4 et en direction de la pièce 2 à marquer, comme montré par la flèche F3 aux figures 2 et 3. Le cylindre de freinage 19, les décolleurs 23 et 24 et les moyens de rembobinage 15-17, qui sont solidaires en translation de la tête de marquage 5, sont alors également déplacés parallèlement à l'axe Y4. Le ruban 7 est ainsi dévidé hors de la boîte d'aspiration 18 et défile par rapport au bâti 3 dans le sens de la flèche F4 de la figure 3, avec une vitesse égale à la vitesse de translation du poinçon 6 par rapport au bâti 3.When the mandrel 9A has positioned the workpiece 2 in this position, the punch 6 carried by the marking head 5 is moved in translation relative to the frame 3, parallel to the longitudinal axis Y 4 of the rail 4 and towards the workpiece 2 to mark, as shown by the arrow F 3 to figures 2 and 3 . The brake cylinder 19, the strippers 23 and 24 and the rewinding means 15-17, which are integral in translation with the marking head 5, are then also moved parallel to the axis Y 4 . The ribbon 7 is thus unwound out of the suction box 18 and scrolled relative to the frame 3 in the direction of the arrow F 4 of the figure 3 , with a speed equal to the translational speed of the punch 6 relative to the frame 3.

Simultanément au mouvement de translation du poinçon 6 dans le sens de la flèche F3 et au défilement du ruban 7 dans le sens de la flèche F4, la pièce 2 est entraînée en rotation autour de l'axe X9 du mandrin 9A, dans le sens de la flèche F5 de la figure 3. Lorsque le poinçon 6 vient au contact de la pièce 2, le ruban 7 est pressé, tout en étant chauffé, contre la surface périphérique externe 2A de la pièce 2 entraînée en rotation, ce qui permet le marquage de la pièce 2.Simultaneously with the translational movement of the punch 6 in the direction of the arrow F 3 and the running of the tape 7 in the direction of the arrow F 4 , the part 2 is rotated about the axis X 9 of the mandrel 9A, in the direction of the arrow F 5 of the figure 3 . When the punch 6 comes into contact with the workpiece 2, the ribbon 7 is pressed, while being heated, against the outer peripheral surface 2A of the part 2 driven in rotation, which allows the marking of the workpiece 2.

Afin de favoriser le refroidissement du ruban 7 en sortie de la pièce 2 au cours du marquage, un mou de ruban est avantageusement fourni, au commencement du marquage, par un retour arrière du moteur brushless associé aux moyens de rembobinage 15-17.In order to promote the cooling of the ribbon 7 at the outlet of the part 2 during the marking, a sliver of ribbon is advantageously provided, at beginning of the marking, by a return of the brushless motor associated with the rewinding means 15-17.

A la fin du marquage, le poinçon 6 se trouve sur la gauche de la pièce 2, comme visible sur la figure 4. Le mandrin 9A, qui tourne sur lui-même autour de l'axe X9, est alors déplacé verticalement vers le centre du plateau 8, par coulissement de son support 10 le long des rails 11 dans le sens de la flèche F6 de la figure 4. Lors du déplacement vertical du mandrin 9A, le plateau 8 est pivoté dans le sens de la flèche F1 de la figure 1, la synchronisation des mouvements du mandrin 9A et du plateau 8 étant obtenue au moyen d'une unité de pilotage non représentée.At the end of the marking, the punch 6 is on the left of the piece 2, as visible on the figure 4 . The mandrel 9A, which turns on itself about the axis X 9 , is then moved vertically towards the center of the plate 8, by sliding its support 10 along the rails 11 in the direction of the arrow F 6 of the figure 4 . During the vertical displacement of the mandrel 9A, the plate 8 is pivoted in the direction of the arrow F 1 of the figure 1 , the synchronization of the movements of the mandrel 9A and the plate 8 being obtained by means of a control unit not shown.

La tête de marquage 5 munie du poinçon 6, le cylindre de freinage 19, les moyens de rembobinage 15-17 et les décolleurs 23 et 24 sont alors également déplacés vers leur position initiale, par une translation parallèlement à l'axe Y4 dans le sens de la flèche F7 de la figure 4. En parallèle, le ruban 7 usagé est rembobiné autour du flasque de rembobinage 17, alors qu'une longueur de ruban est débobinée par rapport au flasque 12 et mise en réserve pour une autre séquence de marquage, par l'actionnement du moteur associé au cylindre entraîneur 13. On retrouve ainsi la configuration de la machine 1 visible sur la figure 1, une portion de ruban neuf étant à nouveau disponible entre les moyens de débobinage 12-14 et de rembobinage 15-17, en vue d'un marquage ultérieur.The marking head 5 provided with the punch 6, the braking cylinder 19, the rewinding means 15-17 and the strippers 23 and 24 are then also moved to their initial position, by a translation parallel to the Y axis 4 in the direction of arrow F 7 of the figure 4 . In parallel, the used ribbon 7 is rewound around the rewinding flange 17, while a ribbon length is unwound with respect to the flange 12 and set aside for another marking sequence, by actuating the engine associated with the cylinder 13. Thus we find the configuration of the machine 1 visible on the figure 1 , a portion of new tape being available again between the unwinding means 12-14 and rewinding 15-17, for subsequent marking.

Le ruban 7 chauffé tend à adhérer par rapport à la surface 2A de la pièce 2 portée par le mandrin 9A. Lors du déplacement de la pièce 2 à la fin du marquage, qui résulte des mouvements combinés du mandrin 9A et du plateau 8, le ruban 7 subit ainsi une légère traction dans la direction de déplacement de la pièce. Cette traction du ruban 7 à la fin du marquage génère un mou perturbateur de ruban 7 entre la surface de freinage 19A et les moyens de rembobinage 15-17. Ce mou perturbateur de ruban 7 est repris lors du rembobinage du ruban 7 consécutif au marquage. En complément, ce mou perturbateur de ruban 7 peut également être repris en désactivant momentanément l'aspiration de la surface de freinage 19A, de sorte que le mou perturbateur est ravalé dans la boîte d'aspiration 18.The heated strip 7 tends to adhere with respect to the surface 2A of the part 2 carried by the mandrel 9A. During the movement of the piece 2 at the end of the marking, which results from the combined movements of the mandrel 9A and the plate 8, the ribbon 7 thus undergoes a slight pull in the direction of movement of the workpiece. This traction of the ribbon 7 at the end of the marking generates a disruptive sliver of tape 7 between the braking surface 19A and the rewinding means 15-17. This ribbon disordering slack 7 is resumed during the rewinding of the tape 7 consecutive marking. In addition, this slack disordering slack 7 can also be resumed by momentarily deactivating the suction of the braking surface 19A, so that the disturbing slack is swallowed in the suction box 18.

A la fin de la séquence de marquage, le plateau tournant 8 a, par sa rotation dans le sens de la flèche F1 de la figure 1, positionné le mandrin 9B au poste de marquage. Le marquage de la pièce 2 portée par le mandrin 9B est obtenu par répétition des étapes précédemment décrites pour le marquage de la pièce 2 portée par le mandrin 9A.At the end of the marking sequence, the turntable 8 has, by its rotation in the direction of the arrow F 1 of the figure 1 positioned the mandrel 9B at the marking station. The marking of the part 2 carried by the mandrel 9B is obtained by repeating the previously described steps for the marking of the part 2 carried by the mandrel 9A.

Comme il ressort des étapes décrites ci-dessus d'une séquence de marquage d'une pièce 2, le guidage du ruban 7 sur la machine 1 conforme à ce premier mode de réalisation de l'invention permet de réaliser le marquage de chaque pièce 2 avec une bonne fiabilité et une bonne qualité de marquage, même pour une largeur du ruban 7 faible, notamment comprise entre environ 8 mm et 25 mm, et une cadence de marquage élevée, par exemple supérieure à 3000 pièces par heure, en particulier supérieure à 6000 pièces par heure, produites avec une seule tête de marquage. En effet, la combinaison de la boîte d'aspiration 18, disposée en sortie des moyens de débobinage 12-14 motorisés, et de la surface de freinage 19A permet de garantir une tension satisfaisante du ruban 7 en regard du poinçon 6, adaptée à sa fonction. La tension du ruban 7 est satisfaisante pour le marquage lorsqu'elle permet un guidage en hauteur et un guidage latéral du ruban. Ainsi, on s'affranchit des risques de déviation du ruban ou de formation de vagues au niveau du ruban, qui nuiraient à la qualité du marquage. De telles vagues de ruban sont notamment susceptibles d'intervenir dans le cas du marquage de pièces de dépouille conique. En outre, le risque d'un défilement saccadé du ruban 7, avec une variation de sa tension, du fait de l'inertie des moyens de débobinage 12-14 est éliminé, grâce à la réserve de ruban 7 avec faible tension formée à l'intérieur de la boîte d'aspiration 18 et au freinage du ruban 7 par la surface de freinage 19A, la boîte d'aspiration 18 et la surface de freinage 19A n'introduisant aucun effet d'inertie indésirable. Le défilement du ruban 7 se fait ainsi avec une tension sensiblement constante du ruban, ce qui garantit un marquage qualitatif des pièces 2.As can be seen from the steps described above of a marking sequence of a part 2, the guidance of the ribbon 7 on the machine 1 according to this first embodiment of the invention makes it possible to mark each part 2 with good reliability and good marking quality, even for a width of the ribbon 7 low, in particular between about 8 mm and 25 mm, and a high marking rate, for example greater than 3000 pieces per hour, in particular greater than 6000 pieces per hour, produced with a single marking head. Indeed, the combination of the suction box 18, disposed at the output of the motorized unwinding means 12-14, and the braking surface 19A makes it possible to guarantee a satisfactory tension of the strip 7 opposite the punch 6, adapted to its function. The tension of the ribbon 7 is satisfactory for marking when it allows height guidance and lateral guidance of the ribbon. Thus, it avoids the risk of deflection ribbon or wave formation at the ribbon, which would affect the quality of the marking. Such ribbon waves are particularly likely to occur in the case of the marking of tapered pieces. In addition, the risk of a jerky movement of the ribbon 7, with a variation of its tension, due to the inertia of the unwinding means 12-14 is eliminated, thanks to the ribbon reserve 7 with low tension formed at the same time. the interior of the suction box 18 and the braking of the ribbon 7 by the braking surface 19A, the suction box 18 and the braking surface 19A introducing no undesirable inertia effect. The ribbon 7 is thus scrolled with a substantially constant tension of the ribbon, which guarantees a qualitative marking of the pieces 2.

Dans le deuxième mode de réalisation représenté sur la figure 7, les éléments analogues au premier mode de réalisation portent des références identiques augmentées de 200. La machine de marquage 201 conforme à ce deuxième mode de réalisation comprend une tête chauffante 205 de marquage, fixe par rapport à un bâti 203 de la machine 201. Une roue de marquage 206 en silicone est montée rotative sur la tête de marquage 205, autour d'un axe X206 sensiblement horizontal et perpendiculaire par rapport au plan de la figure 7. La roue 206 porte des reliefs à marquer sur des pièces 202 au moins partiellement cylindriques, le marquage de chaque pièce 202 étant réalisé par chauffage et compression d'un ruban métallisé 207 entre la roue 206 et la surface périphérique externe 202A de la pièce 202.In the second embodiment shown on the figure 7 , elements similar to the first embodiment bear identical references increased by 200. The marking machine 201 complies with this second embodiment comprises a heating head 205 marking, fixed relative to a frame 203 of the machine 201. A marking wheel 206 silicone is rotatably mounted on the marking head 205, about an axis X 206 substantially horizontal and perpendicular to the plane of the figure 7 . The wheel 206 bears reliefs to mark on parts at least partially cylindrical 202, the marking of each piece 202 being made by heating and compression of a metallized strip 207 between the wheel 206 and the outer peripheral surface 202A of the part 202.

La machine 201 comprend un plateau tournant 208, analogue au plateau 8 du premier mode de réalisation et prévu pour tourner entre deux séquences de marquage autour d'un axe X208 sensiblement parallèle à l'axe X206. Comme dans le premier mode de réalisation, le plateau 208 est pourvu de six mandrins 209 cylindriques à section circulaire, destinés à recevoir chacun une pièce 202. Chaque mandrin 209 est monté rotatif sur un support 210, autour d'un axe X209 sensiblement parallèle aux axes X206 et X208, chaque support 210 étant supporté par des rails 211. Le coulissement d'un mandrin 209 le long des rails 211 n'est permis que lorsque ce mandrin 209 est au voisinage d'un poste de marquage, qui est occupé par le mandrin 209A sur la figure 7. Lorsqu'il est au voisinage de ce poste de marquage, un mandrin 209 est apte à déplacer la pièce 202 qu'il porte par rapport au bâti 203, à la fois en rotation autour de l'axe X209 et en translation parallèlement à un axe vertical Z.The machine 201 comprises a turntable 208, similar to the plate 8 of the first embodiment and designed to rotate between two marking sequences around an axis X 208 substantially parallel to the axis X 206 . As in the first embodiment, the plate 208 is provided with six cylindrical mandrels 209 of circular section, intended to each receive a part 202. Each mandrel 209 is rotatably mounted on a support 210, about a substantially parallel axis X 209 to the X axes 206 and X 208 , each support 210 being supported by rails 211. The sliding of a mandrel 209 along the rails 211 is only allowed when the mandrel 209 is in the vicinity of a marking station, which is occupied by the chuck 209A on the figure 7 . When it is in the vicinity of this marking station, a mandrel 209 is able to move the part 202 which it carries relative to the frame 203, both in rotation about the axis X 209 and in translation parallel to a vertical axis Z.

La figure 7 montre l'agencement des éléments constitutifs de la machine 201 préalablement au marquage de la pièce 202 portée par le mandrin 209A au poste de marquage. La roue 206 est alors disposée verticalement au dessus de cette pièce 202, le ruban 207 s'étendant entre la roue 206 et la pièce 202, depuis des moyens motorisés de débobinage du ruban 207, comprenant un flasque 212 de débobinage, un cylindre entraîneur 213 et un galet presseur 214, vers des moyens motorisés de rembobinage du ruban 207, comprenant un flasque 217 de rembobinage, un cylindre entraîneur 216 et un galet presseur 215, de manière analogue au premier mode de réalisation. La machine 201 comprend également une boîte d'aspiration 218, disposée verticalement au-dessus des moyens de débobinage 212-214, ainsi qu'un cylindre de freinage 219 définissant une surface de freinage 219A, disposé au voisinage de la roue 206 et autour duquel le ruban 207 s'enroule partiellement à la sortie de la boîte d'aspiration 218. Comme dans le premier mode de réalisation, la surface de freinage 219A formée par le cylindre de freinage 219 est fixe en rotation par rapport au bâti 203 de la machine au cours de chaque séquence de marquage. Le parcours du ruban 207 est également guidé par des décolleurs non référencés, l'ensemble des moyens 212-219 de gestion du ruban 207 étant fixe par rapport au bâti 203 de la machine 201. Comme dans le premier mode de réalisation, la combinaison de la boîte d'aspiration 218, disposée en sortie des moyens de débobinage 212-214 motorisés, et de la surface de freinage 219A est destinée à fournir une réserve de ruban 207 sans tension autre que sa tension propre en amont de la surface de freinage 219A, tout en maintenant une tension du ruban 207 satisfaisante pour le marquage en aval de la surface de freinage 219A. Comme dans le premier mode de réalisation, la boîte d'aspiration 218 et la surface de freinage 219A n'introduisent aucun effet d'inertie indésirable.The figure 7 shows the arrangement of the constituent elements of the machine 201 prior to the marking of the part 202 carried by the mandrel 209A at the marking station. The wheel 206 is then disposed vertically above this part 202, the ribbon 207 extending between the wheel 206 and the part 202, from motorized means for unwinding the ribbon 207, comprising a flange 212 unwinding, a driving cylinder 213 and a pressure roller 214, to motorized tape rewinding means 207, comprising a rewinding flange 217, a driving cylinder 216 and a pressure roller 215, similarly to the first embodiment. The machine 201 also includes a suction box 218, disposed vertically above the unwinding means 212-214, and a brake cylinder 219 defining a braking surface 219A disposed in the vicinity of the wheel 206 and around which the ribbon 207 is wound partially in the outlet of the suction box 218. As in the first embodiment, the braking surface 219A formed by the braking cylinder 219 is fixed in rotation relative to the frame 203 of the machine during each sequence of marking. The course of the tape 207 is also guided by unreferenced strippers, the set of means 212-219 for managing the ribbon 207 being fixed relative to the frame 203 of the machine 201. As in the first embodiment, the combination of the suction box 218, disposed at the output of the motorized unwinding means 212-214, and the braking surface 219A is intended to provide a supply of tape 207 without any voltage other than its own voltage upstream of the braking surface 219A while maintaining a ribbon tension 207 satisfactory for marking downstream of the braking surface 219A. As in the first embodiment, the suction box 218 and the braking surface 219A do not introduce any undesirable inertia effect.

Une séquence de marquage d'une pièce 202 sur la machine 201 conforme à ce deuxième mode de réalisation comprend des étapes dans lesquelles :

  • Tout d'abord, la roue 206, qui est animée d'un mouvement de rotation autour de son axe X206 entre deux séquences de marquage en vue de son chauffage, est accélérée jusqu'à la vitesse de marquage. La pièce 202 portée par le mandrin 209A, qui est au poste de marquage, est entraînée en rotation par le mandrin 209A autour de l'axe X209, à la vitesse de marquage et avec un sens de rotation opposé à celui de la roue 206. En parallèle, le support 210 du mandrin 209A coulisse verticalement vers le haut le long des rails 211, en direction de la roue 206.
A part marking sequence 202 on the machine 201 according to this second embodiment comprises steps in which:
  • First, the wheel 206, which is rotated about its axis X 206 between two marking sequences for heating, is accelerated to the marking speed. The part 202 carried by the mandrel 209A, which is at the marking station, is rotated by the mandrel 209A about the X axis 209 , at the marking speed and with a direction of rotation opposite to that of the wheel 206 In parallel, the support 210 of the mandrel 209A slides vertically upwards along the rails 211, towards the wheel 206.

Lorsque la pièce 202 portée par le mandrin 209A vient au contact de roue 206, le moteur associé au cylindre entraîneur 216 est actionné de manière à obtenir un tirage du ruban 207 et son défilement par rapport au bâti 203, à une vitesse appropriée pour le marquage. Le défilement du ruban 207 résulte du dévidement du ruban 207 hors de la boîte d'aspiration 208 et du rembobinage du ruban par les moyens de rembobinage 215-217. Conformément à l'invention, une réserve de ruban sans tension autre que sa tension propre est maintenue dans la boîte d'aspiration 218 pour chaque séquence de marquage, de manière analogue au premier mode de réalisation. Le ruban 207, intercalé entre la roue 206 et la pièce 202, est pressé, tout en étant chauffé, entre la surface périphérique de la roue 206 et la surface périphérique 202A de la pièce 202 entraînées en rotation, ce qui permet le marquage de la pièce 202.When the piece 202 carried by the mandrel 209A comes into wheel contact 206, the motor associated with the driving cylinder 216 is actuated so as to obtain a draw of the tape 207 and its movement relative to the frame 203, at a speed suitable for marking . Ribbon scrolling 207 results from the unwinding of the tape 207 out of the suction box 208 and the rewinding of the tape by the rewinding means 215-217. According to the invention, a supply of ribbon without tension other than its own tension is maintained in the suction box 218 for each marking sequence, similarly to the first embodiment. The ribbon 207, interposed between the wheel 206 and the part 202, is pressed, while being heated, between the peripheral surface of the wheel 206 and the peripheral surface 202A of the part 202 driven in rotation, which allows the marking of the room 202.

Afin de favoriser le refroidissement du ruban 207 en sortie de la pièce 202 au cours du marquage, un mou de ruban est avantageusement fourni, au commencement du marquage, en générant un retard au tirage du ruban 207 ou un arrêt temporaire du tirage du ruban 207 par les moyens de rembobinage 215-217, à l'aide d'une commande appropriée du moteur associé aux moyens 215-217.In order to promote the cooling of the ribbon 207 at the outlet of the part 202 during marking, a sliver of ribbon is advantageously provided, at the beginning of the marking, by generating a delay in the draw of the ribbon 207 or a temporary stopping of the ribbon draw 207 by the rewinding means 215-217, with the aid of an appropriate engine control associated with the means 215-217.

A la fin du marquage, le mandrin 209A, qui tourne sur lui-même autour de l'axe X209, est déplacé verticalement vers le centre du plateau 208, par coulissement de son support 210 le long des rails 211, ce qui éloigne la pièce 202 de la roue 206. Lors du déplacement vertical du mandrin 209A, le plateau 208 est également pivoté, la synchronisation des mouvements du mandrin 209A et du plateau 208 étant obtenue au moyen d'une unité de pilotage non représentée.At the end of the marking, the mandrel 209A, which rotates about itself about the axis X 209 , is moved vertically towards the center of the plate 208, by sliding its support 210 along the rails 211, which distances the part 202 of the wheel 206. During the vertical movement of the mandrel 209A, the plate 208 is also pivoted, the synchronization of the movements of the mandrel 209A and the plate 208 being obtained by means of a not shown control unit.

Comme dans le premier mode de réalisation, le ruban 207 chauffé tend à adhérer par rapport à la surface 202A de la pièce 202. Lors du déplacement de la pièce 202 à la fin du marquage, qui résulte des mouvements combinés du mandrin 209A et du plateau 208, le ruban 207 subit ainsi une légère traction dans la direction de déplacement de la pièce. Cette traction du ruban 207 à la fin du marquage génère un mou perturbateur de ruban 207 entre la surface de freinage 219A et les moyens de rembobinage 215-217. Ce mou perturbateur de ruban 207 est repris en désactivant momentanément l'aspiration de la surface de freinage 219A, de sorte que le mou perturbateur est ravalé dans la boîte d'aspiration 218.As in the first embodiment, the heated ribbon 207 tends to adhere with respect to the surface 202A of the workpiece 202. During the movement of the workpiece 202 at the end of the marking, which results from the combined movements of the mandrel 209A and the tray 208, the tape 207 thus undergoes a slight pull in the direction of movement of the workpiece. This traction of the tape 207 at the end of the marking generates a ribbon disruptive slime 207 between the braking surface 219A and the rewinding means 215-217. This disruptive tape slack 207 is resumed by momentarily deactivating the suction of the braking surface 219A, so that the disturbing slack is swallowed in the suction box 218.

A la fin de la séquence de marquage, le plateau tournant 208 a, par sa rotation, positionné un autre mandrin 209 au poste de marquage.At the end of the marking sequence, the turntable 208 has, by its rotation, positioned another mandrel 209 at the marking station.

Quel que soit le mode de réalisation, une machine de marquage conforme à l'invention permet donc de réaliser le marquage de pièces avec une bonne fiabilité et une bonne qualité du marquage, même pour une largeur faible du ruban utilisé et une cadence de marquage élevée, grâce à la combinaison de la boîte d'aspiration, disposée à la sortie de moyens de débobinage motorisés, et de la surface de freinage. La réserve de ruban avec une faible tension formée à l'intérieur de la boîte d'aspiration permet en effet de s'affranchir de l'inertie propre aux moyens de débobinage et d'obtenir un défilement avec une tension sensiblement constante du ruban en regard de l'organe de marquage, alors que la surface de freinage est nécessaire pour assurer une tension satisfaisante de la portion de ruban passant en regard de l'organe de marquage. Cette tension du ruban est obtenue sans effets d'inertie indésirables, contrairement à la tension qui serait obtenue avec un dispositif de tension constante, tel qu'un bras batteur à ressort.Whatever the embodiment, a marking machine according to the invention thus makes it possible to mark parts with good reliability and good quality of marking, even for a small width of the tape used and a high marking rate. , thanks to the combination of the suction box, disposed at the output of motorized unwinding means, and the braking surface. The reserve of ribbon with a low voltage formed inside the suction box makes it possible to overcome the inertia proper to the unwinding means and to obtain a scroll with a substantially constant tension of the ribbon opposite the marking member, while the braking surface is necessary to ensure a satisfactory tension of the ribbon portion passing next to the marking member. This ribbon tension is obtained without undesirable inertia effects, unlike the tension that would be obtained with a constant tension device, such as a spring-loaded mixing arm.

En d'autres termes, sur une machine de marquage conforme à l'invention, comprenant une boîte d'aspiration disposée à la sortie de moyens de débobinage motorisés et une surface de freinage, la réserve de ruban dans la boîte d'aspiration présente une première tension relativement faible, alors que le ruban présente une deuxième tension plus élevée que la première tension entre la surface de freinage et les moyens de rembobinage, cette deuxième tension étant satisfaisante pour le marquage de pièces. En outre, la boîte d'aspiration et la surface de freinage n'introduisent aucun effet d'inertie indésirable.In other words, on a marking machine according to the invention, comprising a suction box disposed at the output of motorized unwinding means and a braking surface, the supply of ribbon in the suction box has a relatively low first voltage, while the ribbon has a second voltage higher than the first voltage between the braking surface and the rewinding means, this second voltage being satisfactory for marking parts. In addition, the suction box and the braking surface do not introduce any undesirable inertia effect.

L'invention n'est pas limitée aux exemples décrits et représentés. En particulier, une machine de marquage à chaud conforme à l'invention, comprenant une boîte d'aspiration disposée en sortie de moyens de débobinage motorisés et une surface de freinage, peut être appliquée au marquage de pièces à section transversale non circulaire, le profil et la cinématique de mandrins de support de telles pièces étant adaptés en conséquence. Une machine de marquage conforme à l'invention peut également être mise en oeuvre avec des mandrins individuels, qui ne sont pas intégrés sur un plateau tournant tel que décrit précédemment et assurent un déplacement approprié de pièces à marquer.The invention is not limited to the examples described and shown. In particular, a hot stamping machine according to the invention, comprising a suction box disposed at the output of motorized unwinding means and a braking surface, can be applied to the marking of non-circular cross section pieces, the profile and the kinematics of supporting mandrels of such parts being adapted accordingly. A marking machine according to the invention can also be implemented with individual chucks, which are not integrated on a turntable as described above and ensure proper movement of parts to mark.

De plus, la cinématique conférée aux éléments de la machine de marquage peut être différente de celle décrite et représentée. En particulier, dans le cas d'un poinçon plan, le poinçon peut être fixe en translation par rapport au bâti de la machine au cours du marquage, la pièce à marquer étant alors déplacée à la fois en rotation et en translation par rapport au poinçon au cours du marquage. La combinaison de la boîte d'aspiration et de la surface de freinage est alors utilisée pour réduire les contraintes en déformation subies par le ruban lors de son rembobinage rapide, dans le cas de cadences élevées de marquage. En outre, le mouvement de mise en contact de l'organe de marquage avec une pièce à marquer peut être pris en charge par l'organe de marquage, et non par le mandrin de support de la pièce. Dans les modes de réalisation décrits, l'organe de marquage 6 ou 206 peut ainsi être prévu pour se déplacer verticalement, le mouvement vertical des mandrins 9 ou 209 n'étant alors plus nécessaire.In addition, the kinematics imparted to the elements of the marking machine may be different from that described and shown. In particular, in the case of a flat punch, the punch can be fixed in translation relative to the frame of the machine during marking, the piece to be marked then being moved both in rotation and in translation relative to the punch during marking. The combination of the suction box and the braking surface is then used to reduce the deformation stresses experienced by the ribbon during its rapid rewinding, in the case of high marking rates. In addition, the movement of contacting the marking member with a part to be marked can be supported by the marking member, and not by the support chuck of the piece. In the embodiments described, the marking member 6 or 206 can thus be provided to move vertically, the vertical movement of the mandrels 9 or 209 then no longer necessary.

Par ailleurs, lorsque le poinçon plan est mobile en translation par rapport au bâti de la machine au cours du marquage comme dans le premier mode de réalisation, les différents éléments 12-19 de gestion du ruban peuvent être embarqués ou non avec le poinçon, indépendamment les uns des autres ou simultanément. On peut ainsi envisager que seule la surface de freinage est embarquée avec le poinçon dans le premier mode de réalisation, alors que les moyens de rembobinage 15-17 sont fixes par rapport au bâti de la machine. Inversement, on peut embarquer uniquement les moyens de rembobinage 15-17 avec le poinçon, la surface de freinage étant gardée fixe. Les moyens de débobinage 12-14 et la boîte d'aspiration 18 peuvent également être embarqués avec le poinçon lorsque la surface de freinage est elle-même embarquée. Le défilement du ruban en regard du poinçon est adapté à chaque configuration, par une programmation appropriée des moyens de débobinage et de rembobinage du ruban. En particulier, la séquence de défilement du ruban au cours d'une séquence de marquage avec un poinçon plan, est, pour une configuration de la machine de marquage dans laquelle les moyens de débobinage 12-14 et de rembobinage 15-17 du ruban sont fixes par rapport au bâti de la machine, la même que celui décrit dans le deuxième mode de réalisation mettant en jeu la roue de marquage 206.Furthermore, when the plane punch is movable in translation relative to the frame of the machine during the marking as in the first embodiment, the various elements 12-19 management of the ribbon can be embedded or not with the punch, independently from each other or simultaneously. It can thus be envisaged that only the braking surface is embarked with the punch in the first embodiment, while the rewinding means 15-17 are fixed relative to the frame of the machine. Conversely, it is possible to embark only the rewinding means 15-17 with the punch, the braking surface being kept fixed. The unwinding means 12-14 and the suction box 18 can also be embarked with the punch when the braking surface is itself embarked. Scrolling tape next to the punch is adapted to each configuration, by appropriate programming of the means of unwinding and rewinding ribbon. In particular, the tape running sequence during a marking sequence with a plane punch is, for a machine configuration marking in which the unwinding means 12-14 and rewinding 15-17 of the tape are fixed relative to the frame of the machine, the same as that described in the second embodiment involving the marking wheel 206.

La position relative des éléments de guidage du ruban montrée dans les premier et deuxième modes de réalisation peut également être modifiée, la boîte d'aspiration pouvant par exemple être disposée horizontalement par rapport aux moyens de débobinage, ou encore au-dessous de ces moyens de débobinage. La surface de freinage du ruban, formée par le cylindre de freinage dans les exemples décrits, peut également être de toute forme autre qu'une portion de cylindre, notamment plane. De plus, cette surface de freinage peut être intégrée à l'intérieur de la boîte aspirante, en étant formée par exemple par une paroi de la boîte aspirante. Un tel agencement est plus compact et permet de réduire l'encombrement de la machine de marquage.The relative position of the ribbon guiding elements shown in the first and second embodiments may also be modified, the suction box may for example be arranged horizontally relative to the uncoiling means, or below these means of unwinding. The braking surface of the ribbon, formed by the braking cylinder in the examples described, may also be of any shape other than a portion of a cylinder, in particular a plane. In addition, this braking surface can be integrated inside the suction box, being formed for example by a wall of the suction box. Such an arrangement is more compact and reduces the size of the marking machine.

Claims (11)

  1. Hot marking machine (1; 201), of the type comprising
    - a marking member (6; 206) intended to press a tape (7; 207) against the peripheral surface (2A; 202A) of individual components (2; 202) in order to mark them, the individual components (2; 202) being positioned in succession in a marking station and marked by repeating a marking sequence on each component (2; 202), the machine (1; 201) comprising
    - tape unwinding means (12-14; 212-214) and
    - tape rewinding means (15-17; 215-217),
    characterized in that
    - the unwinding means (12-14; 214) are intended to unwind a length of tape (7; 207) in sequence after the end of each marking sequence ready for the next marking sequence,
    - the machine further comprises a tape suction box (18; 218) and a tape braking surface (19A; 219A),
    - the braking surface (19A; 219A) is of an orientation that is fixed with respect to the frame (3; 203) of the machine (1; 201) during each marking sequence,
    - the tape (7; 207) from the unwinding means (12-14; 212-214) passes in succession through the suction box (18; 218), along the braking surface (19A; 219A) and past the marking member (6; 206) so that a reserve of tape (7; 207) is available in the suction box (18; 218) between the unwinding means (12-14; 212-214) and the braking surface (19A; 219A), whereas the tape (7; 207) is taut past the marking member (6; 206) between the braking surface (19A; 219A) and the rewinding means (15-17; 215-217).
  2. Marking machine according to Claim 1, characterized in that the braking surface (19A; 219A) is a surface pierced with suction orifices (192) for sucking the tape (7; 207).
  3. Marking machine according to either one of Claims 1 and 2, characterized in that the braking surface (19A; 219A) is formed by a braking cylinder (19; 219) around which the tape (7; 207) is partially wrapped.
  4. Marking machine according to Claim 3, characterized in that the braking cylinder (19; 219) comprises an external envelope (191) forming the braking surface (19A; 219A) and a hollow internal body (193) housed inside the envelope (191) and connected to a vacuum source, the envelope (191) being pierced with suction orifices (192) for sucking the tape (7; 207) at the braking surface (19A; 219A), these being able to communicate with the inside of the hollow body (193) through corresponding orifices (194) in the body (193), the orifices (194) in the body (193) being able to be offset angularly with respect to the orifices (192) in the envelope (191) so as to modify the suction force applied by the braking surface (19A; 219A) to the tape (7; 207).
  5. Marking machine according to any one of the preceding claims, characterized in that the unwinding means (12-14; 212-214) are motorized, the machine (1; 201) comprising means (188) of detecting the length of tape (7; 207) available between the unwinding means (12-14; 212-214) and the braking surface (19A; 219A), these detection means (188) being connected to the drive mechanism that motorizes the unwinding means (12-14; 212-214) so as to modify said length of tape (7; 207).
  6. Marking machine according to any one of the preceding claims, characterized in that the suction box (18; 218) comprises means (186) of containing the tape (7; 207) against the interior walls (183, 185) of the suction box.
  7. Marking machine according to any one of the preceding claims, characterized in that the marking member (6; 206) is fixed in terms of translation with respect to the frame (3; 203) of the machine (1; 201) during the marking of a component (2; 202), the machine (1; 201) comprising means (9; 209) of moving the component (2; 202) with respect to the marking member (6; 206), which move it at least in terms of rotation about an axis (X9; X209) during marking.
  8. Marking machine according to any one of Claims 1 to 6, characterized in that the marking member (6) is able to move in translation parallel to an axis (Y4) with respect to the frame (3) of the machine (1) during the marking of a component (2), the machine (1) comprising means (9) of moving the component (2) with respect to the marking member (6), which move it solely in terms of rotation about an axis (X9) during marking.
  9. Marking machine according to Claim 8, characterized in that the braking surface (19A) has a translational movement with respect to the frame (3) of the machine (1) which is identical to that of the marking member (6) when a component (2) is being marked.
  10. Marking machine according to either one of Claims 8 and 9, characterized in that the rewinding means (15-17) have a translational movement with respect to the frame (3) of the machine (1) which is identical to that of the marking member (6) when a component (2) is being marked.
  11. Marking machine according to any one of the preceding claims, characterized in that the marking member is a plane punch (6) or a marking wheel (206).
EP08787824.5A 2007-03-21 2008-03-20 Tape marking machine Active EP2125371B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL08787824T PL2125371T3 (en) 2007-03-21 2008-03-20 Tape marking machine

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0702056A FR2913914B1 (en) 2007-03-21 2007-03-21 RIBBON MARKING MACHINE
PCT/FR2008/000377 WO2008142225A2 (en) 2007-03-21 2008-03-20 Tape marking machine

Publications (2)

Publication Number Publication Date
EP2125371A2 EP2125371A2 (en) 2009-12-02
EP2125371B1 true EP2125371B1 (en) 2018-03-07

Family

ID=38691897

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Application Number Title Priority Date Filing Date
EP08787824.5A Active EP2125371B1 (en) 2007-03-21 2008-03-20 Tape marking machine

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US (1) US8074568B2 (en)
EP (1) EP2125371B1 (en)
BR (1) BRPI0808902B1 (en)
FR (1) FR2913914B1 (en)
MX (1) MX2009010093A (en)
PL (1) PL2125371T3 (en)
WO (1) WO2008142225A2 (en)

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Also Published As

Publication number Publication date
PL2125371T3 (en) 2018-08-31
FR2913914A1 (en) 2008-09-26
WO2008142225A3 (en) 2009-02-19
US8074568B2 (en) 2011-12-13
US20090178581A1 (en) 2009-07-16
MX2009010093A (en) 2009-10-19
BRPI0808902B1 (en) 2018-12-04
BRPI0808902A2 (en) 2014-08-19
EP2125371A2 (en) 2009-12-02
BRPI0808902A8 (en) 2017-01-24
WO2008142225A2 (en) 2008-11-27
FR2913914B1 (en) 2012-09-07

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