Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41F—PRINTING MACHINES OR PRESSES
  • B41F19/00—Apparatus or machines for carrying out printing operations combined with other operations
  • B41F19/02—Apparatus or machines for carrying out printing operations combined with other operations with embossing
  • B41F19/06—Printing 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"
  • B41F19/064—Presses of the reciprocating type
  • B41F19/068—Presses of the reciprocating type motor-driven
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41F—PRINTING MACHINES OR PRESSES
  • B41F16/00—Transfer printing apparatus
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41F—PRINTING MACHINES OR PRESSES
  • B41F17/00—Printing apparatus or machines of special types or for particular purposes, not otherwise provided for
  • B41F17/08—Printing 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
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41F—PRINTING MACHINES OR PRESSES
  • B41F17/00—Printing apparatus or machines of special types or for particular purposes, not otherwise provided for
  • B41F17/08—Printing 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
  • B41F17/14—Printing 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
  • B41F17/18—Printing 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
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
  • B41J17/00—Mechanisms for manipulating page-width impression-transfer material, e.g. carbon paper
  • B41J17/22—Supply arrangements for webs of impression-transfer material
  • B41J17/24—Webs supplied from reels or spools attached to the machine
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
  • B41J17/00—Mechanisms for manipulating page-width impression-transfer material, e.g. carbon paper
  • B41J17/28—Arrangements of guides for the impression-transfer material
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
  • B65H18/00—Winding webs
  • B65H18/08—Web-winding mechanisms
  • B65H18/10—Mechanisms in which power is applied to web-roll spindle
  • B65H18/103—Reel-to-reel type web winding and unwinding mechanisms
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
  • B65H20/00—Advancing webs
  • B65H20/30—Arrangements for accumulating surplus web
  • B65H20/32—Arrangements for accumulating surplus web by making loops
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
  • B65H23/00—Registering, tensioning, smoothing or guiding webs
  • B65H23/04—Registering, tensioning, smoothing or guiding webs longitudinally
  • B65H23/06—Registering, tensioning, smoothing or guiding webs longitudinally by retarding devices, e.g. acting on web-roll spindle
  • B65H23/10—Registering, tensioning, smoothing or guiding webs longitudinally by retarding devices, e.g. acting on web-roll spindle acting on running web
  • B65H23/14—Tensioning rollers applying braking forces
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
  • B41P2219/00—Printing presses using a heated printing foil
  • B41P2219/40—Material or products to be decorated or printed
  • B41P2219/43—Three-dimensional articles
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
  • B65H2406/00—Means using fluid
  • B65H2406/30—Suction means
  • B65H2406/33—Rotary suction means, e.g. roller, cylinder or drum
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
  • B65H2701/00—Handled material; Storage means
  • B65H2701/30—Handled filamentary material
  • B65H2701/35—Ropes, lines
  • B65H2701/357—Marking 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.
• 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 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 part, the machine comprising means for unwinding the tape, intended to unwind a length of tape sequentially at the end of each marking sequence for the purpose of the marking sequence ribbon rewinding means, characterized in that it further comprises a ribbon suction box and a braking surface of the ribbon, the braking surface having a fixed orientation relative to the frame of the machine at the during each marking sequence, the ribbon from the unwinding means passing successively in the suction box, along the surface against 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 against the marking member between the braking surface and the rewinding means.
• the braking surface is a surface pierced with suction orifices of the ribbon; -
• the braking surface is formed by a braking cylinder around which the ribbon is partially wound;
• the braking cylinder comprises an outer casing forming the braking surface and a hollow internal body housed in the casing and connected to a source of depression, the casing being pierced with suction orifices of the ribbon at the level of the braking surface, 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 effort of suction 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 unwinding means so as to modulate the length of ribbon aforesaid;
• the suction box comprises means for confining the tape 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 it at least rotating about an axis during marking;
• the marking member is movable in translation parallel to an axis relative to the frame of the machine during marking of a workpiece, the machine comprising means for moving the workpiece relative to the marking member, which move it only in rotation about an axis during marking;
• the braking surface has a translational 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 translational movement relative to the frame of the machine identical to that of the marking member during the marking of a workpiece;
• FIG. 1 is a front view of a marking machine according to a first embodiment of the invention, between two marking sequences;
• FIG. 2 is a view similar to FIG. 1, during a first step of a marking sequence
• FIG. 3 is a view similar to FIG. 1, during a second step of a marking sequence
• FIG. 4 is a view similar to FIG. 1, during a third step of a marking sequence
• FIG. 5 is an enlarged section of a braking cylinder of the marking machine shown in FIGS. 1 to 4;
• FIG. 6 is an exploded perspective view of the braking cylinder of FIG. 5;
• Figure 7 is a view similar to Figure 1 for a marking machine according to a second embodiment of the invention.
• the marking machine 1, shown in Figures 1 to 4 is intended for marking parts 2 at least partially cylindrical, made of plastic material.
• the parts are intended for marking parts 2 at least partially cylindrical, made of plastic material.
• 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 Fi of FIG.
• the plate 8 can rotate in the opposite direction to that shown in Figure 1.
• the plate 8 is as described in EP-A-1 518 675.
• the plate 8 is provided with six cylindrical mandrels 9 section circular, 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 station, occupied by the mandrel noted 9A in Figures 1 to 4, corresponds to a marking station of the part 2 mounted on the mandrel 9A.
• the station arranged on the left of the marking station, which is occupied by the mandrel denoted 9B in FIGS. 1 to 4, may correspond to a position of identification of one or more particular points of the part 2 mounted on the mandrel 9B, for example by means of a tracking camera not shown.
• each mandrel 9 can in turn correspond to a control station for 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.
• the other stations may correspond to loading and unloading stations of parts 2 compared to mandrels 9.
• 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 in FIGS. 1 to 4, the support 10 of this mandrel is adapted to slide vertically along the rails 11 relative to the plate 8 and to the frame 3, as shown by the arrow F 2 of FIG. 1.
• each mandrel 9 is able, when it is at the marking station, to move the workpiece 2 that it supports relative to the frame 3, both in rotation about the axis Xg and in translation parallel to a vertical axis Z.
• a mandrel 9 is in one of the other five positions, the sliding of support 10 with respect to the rails 11 is not allowed and the support 10 is immobilized near the center of the plate 8.
• 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 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.
• a satisfactory scroll ribbon 7 inside the suction box 18 is ensured, thanks to the effect of aspiration due to the fan 182, without risk of disturbances related to the appearance of electrostatic charges at the interface between the walls of the box 18 and 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 braking cylinder 19, visible on a larger scale in FIGS. 5 and 6, comprises a tubular casing 191, centered on an axis Xi 9 and in which is housed a hollow body 193, of a shape substantially complementary to that of the casing 191.
• a first end 191 A of the casing 191 is provided with a connection piece to a vacuum source, such that, by way of non-limiting examples, a Venturi pipe, a vacuum source or a fan, this end piece opening into the interior volume of the hollow body 193.
• the second end 191 B of the casing 191, opposite the end 191 A, 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 holes 192 on a portion 19A of its outer peripheral surface forming the braking surface of the cylinder 19, corresponding through holes 194 are 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 around the axis Xi 9 . 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.
• 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.
• a marking sequence of a workpiece 2 on the machine 1, illustrated for the workpiece 2 carried by the mandrel 9A in FIGS. 1 to 4, comprises steps in which:
• the support 10 of the mandrel 9A slides along the rails 1 1, in the direction of the arrow F 2 of Figure 1, so as to reach the position shown in Figure 2.
• 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 translational movement towards the piece 2 parallel to the Y axis 4 , is adapted to come into contact with the outer peripheral surface 2A of this part 2 to be marked.
• 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 be marked, as shown by the arrow F 3 in FIGS. 2 and 3.
• the braking 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 Y axis 4 .
• the ribbon 7 is thus unwound from the suction box 18 and moves relative to the frame 3 in the direction of the arrow F 4 of FIG. 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 Xg of the mandrel 9A, in the direction of the arrow F 5 of FIG. 3.
• the strip 7 is pressed, while being heated, against the external peripheral surface 2A of the part 2 driven in rotation, which allows the marking of the part 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 part 2, as can be seen in FIG. 4.
• the mandrel 9A which turns on itself around 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 FIG. 4.
• the plate 8 is pivoted in the direction of the arrow F 1 of FIG. 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 the arrow F 7 of Figure 4.
• the ribbon 7 used is rewound around the rewinding flange 17, while a length of ribbon is unwound with respect to the flange 12 and stored for another sequence of marking, by the actuation of the engine associated with the drive cylinder 13.
• the configuration of the machine 1 can be seen in Figure 1, a portion of new tape being available again between the unwinding means 12- 14 and rewinding 15 -17, for subsequent marking.
• 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 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 conforms to FIG. this second embodiment comprises a heating head 205 marking, fixed relative to a frame 203 of the machine 201.
• a marking wheel 206 of silicone is rotatably mounted on the marking head 205, about an axis X 2 o6 substantially horizontal and perpendicular to the plane of Figure 7.
• the wheel 206 bears reliefs to mark on at least partially cylindrical parts 202, the marking of each piece 202 being formed 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 a substantially parallel axis X 20 ⁇ to the X axis 206 -
• the plate 208 is provided with six cylindrical mandrels 209 circular section, intended to each receive a part 202.
• Each mandrel 209 is rotatably mounted on a support 210, about an axis X209 substantially parallel to the X axes 206 and X 208 , each support 210 being supported by rails 211.
• a mandrel 209 is allowed that when the mandrel 209 is in the vicinity of a marking station, which is occupied by the mandrel 209A in Figure 7. When it is in the vicinity of this marking station, a mandrel 209 is able to move the piece 202 that it bears relative to the frame 203, both in rotation about the axis X 209 and in translation parallel to a vertical axis Z.
• 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.
• a part marking sequence 202 on the machine 201 comprises steps in which:
• the wheel 206 which is rotated about its axis X 2 o 6 between two marking sequences for heating, is accelerated to the marking speed.
• the piece 202 carried by the chuck 209A which is the marking station, is rotated by the mandrel 209A about the axis X 20 9, the marking speed and a direction of rotation opposite to that of the wheel 206.
• the support 210 of the mandrel 209A slides vertically upwards along the rails 211, in the direction of the wheel 206.
• 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 piece 202.
• the ribbon 207 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 piece 202.
• a ribbon slack is advantageously provided, at the beginning of the marking, by generating a delay in the draw of the tape 207 or a temporary stopping of the draw of the tape 207 by the rewinding means 215-217, using an appropriate engine control associated with means 215-217.
• the mandrel 209A which rotates about itself about the axis X2 0 9, is moved vertically towards the center of the plate 208, by sliding of its support 210 along the rails 211, which distances the part 202 of the wheel 206.
• the plate 208 is also rotated, 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 even below these uncoiling means .
• 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)

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• 2007
  • 2007-03-21 FR FR0702056A patent/FR2913914B1/fr active Active
• 2008
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  • 2008-03-20 EP EP08787824.5A patent/EP2125371B1/de active Active
  • 2008-03-20 WO PCT/FR2008/000377 patent/WO2008142225A2/fr active Application Filing
  • 2008-03-20 BR BRPI0808902A patent/BRPI0808902B1/pt active IP Right Grant
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• 2009
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