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EP0858888B2 - Presse d'estampage à plat - Google Patents
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EP0858888B2 - Presse d'estampage à plat - Google Patents

Presse d'estampage à plat Download PDF

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Publication number
EP0858888B2
EP0858888B2 EP98101498A EP98101498A EP0858888B2 EP 0858888 B2 EP0858888 B2 EP 0858888B2 EP 98101498 A EP98101498 A EP 98101498A EP 98101498 A EP98101498 A EP 98101498A EP 0858888 B2 EP0858888 B2 EP 0858888B2
Authority
EP
European Patent Office
Prior art keywords
foil
embossing
flat
machine according
loop
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.)
Expired - Lifetime
Application number
EP98101498A
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German (de)
English (en)
Other versions
EP0858888A2 (fr
EP0858888B1 (fr
EP0858888A3 (fr
Inventor
Hanspeter Gietz
Manfred Rösli
Beat Kägi
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.)
Maschinenfabrik Gietz AG
Original Assignee
Maschinenfabrik Gietz AG
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Filing date
Publication date
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Application filed by Maschinenfabrik Gietz AG filed Critical Maschinenfabrik Gietz AG
Publication of EP0858888A2 publication Critical patent/EP0858888A2/fr
Publication of EP0858888A3 publication Critical patent/EP0858888A3/fr
Publication of EP0858888B1 publication Critical patent/EP0858888B1/fr
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Classifications

    • 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
    • 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
    • B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
    • B41P2219/00—Printing presses using a heated printing foil
    • B41P2219/10—Driving devices for the reciprocating die
    • B41P2219/13—Gearings
    • B41P2219/134—Knee-lever
    • 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
    • B41P2219/20—Arrangements for moving, supporting or positioning the printing foil
    • 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
    • B41P2219/42—Sheet-like 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
    • B65H2406/00—Means using fluid
    • B65H2406/30—Suction means
    • B65H2406/31—Suction box; Suction chambers
    • B65H2406/311—Suction box; Suction chambers for accumulating a loop of handled 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
    • B65H2408/00—Specific machines
    • B65H2408/20—Specific machines for handling web(s)
    • B65H2408/21—Accumulators
    • B65H2408/215—Accumulators supported by vacuum or blown air

Definitions

  • the invention relates to a flat embossing machine for a flat material to be embossed with a flat press, embossing table and tool plate according to the preamble of claim 1.
  • embossing foil webs during the stamping phase on the embossing table exactly be held still and then be advanced during the unpressurized phase quickly in the next embossing position of the film web.
  • the delicate stamping foil webs must be treated and promoted gently. This is difficult to achieve, because due to this embossing cycle results in a very uneven feed at the embossing, while the sluggish unwinding be driven substantially uniformly.
  • a completely different type of machine, embossing machines with at least one embossing cylinder, with a baptismal store is known from GB 2 254 586.
  • a film web is pulled by a continuously running unwinding roll via a loop storage gradually through the embossing gap, wherein in the loop memory with the support of an air flow, a free-hanging film loop is formed to compensate for film web length changes.
  • these known rotary embossing machines are very limited in terms of stamping quality and machine speed and, above all, the requirements for the film guide according to the relatively low speed differences, however, are relatively low.
  • a flat embossing machine according to claim 1.
  • the film loop storage with a differential printing device for length compensation loops of the film web quickly, gently and formed in a compact space, while the film feeding device with the associated feed and loop memory control optimal positioning on Ensures embossing place.
  • the dependent claims relate to advantageous developments of the invention. They concern further improvements of the embossing machine functions and properties, and allow an even wider range of applications. Particularly advantageous combinations result in the additional adjustment of toggle geometry and embossing time and pressure control of the press and register control of the flat material to be embossed.
  • FIG. 1 shows a flat embossing machine according to the invention for a flat material 5 to be embossed, with a flat-flat press 2, with an embossing table 3 and as a counterpart a tool plate 4 with clichés 23 as well as with at least one stamping foil web 6.
  • the flat material 5 to be embossed consists in this example of sheet 5.1, which led from a feeder 71 via a register device 70 to the flat embossing table 3, stamped there at a standstill and then stacked in a boom 72.
  • the press is a toggle press 41 with four toggle lever pairs 43, with joints 44 and 45 and two pairs of tie rods 42.
  • the tool plate 4 is adjustable in the Z direction by means of a positioning device 61, e.g.
  • the embossing material is on one or more film webs 6, 6.1, 6.2 of unwinding rollers 7, 7.1, 7.2 via a first, the press upstream film loop storage 10 and a film feed device 24 on one side of the embossing table 3 and a clamping device 25 on the other side of the embossing table conveyed and then fed to a Folienab fossil issued 8.
  • the film web 6 can be guided via a second, downstream of the press film loop storage 20 on one or more take-up rollers 80.
  • a direct film discharge device 81 e.g. in the form of a compactor or shredder system, be used.
  • the film feed device 24 is a precisely controllable slip-free feed of the film web 6, e.g. by means of light rollers or suction elements, ensured while the clamping device 25 generates an adjustable optimum, uniform film tension on the embossing table, so that the film is held at the embossing position accurate, smooth and without distortion and overstretching for embossing at a standstill.
  • the film feed device 24 is connected downstream of the press and the tensioning device 25, e.g. as a precisely adjustable slip brake with constant braking force or Follenwear, the press upstream.
  • a downstream tensioning device 25 which is controlled by an upstream film feeding device in a precise and slip-free manner (for example in FIG. 14).
  • the flat embossing machine has a Folienvorschub- and memory controller 52 with associated operating and display device 40.
  • This feed control W (t) must be as gentle, precise and fast as possible, so that the film web 6 is held in positional accuracy during the printing phase TP (see FIG. 4) on the embossing table 3 and then rapidly and yet gently into the next during the unpressurized phase TL Complex is preferred. As will be explained further in the examples of FIG. 4, this results in large, rapidly changing speed differences between the relatively constant unwinding or winding speeds V7, V8 on the one hand and the intermittently extending feed speed VV (t). With the film loop stores 10, 20 these differences are compensated by enlargement or reduction of the loops 12 in the stores. For this purpose, the memory with a differential pressure device 30 are connected, which exerts an air pressure difference in the memory 12 on the loops 12 and thus keeps these loops always smooth and stretched.
  • FIG. 2 shows, as a further example, a flat embossing machine with an endless web 5.2 as a flat material 5 to be embossed with a dancer roller store 110, wherein here the flat material and the film web 6 are conveyed in the opposite direction, while FIG. 1 shows the synchronization of flat material 5, which is advantageous in many cases and film web 6 illustrated.
  • the foil side Velocity ratios with respect to VV, V7, V8 also remain the same as described for FIG.
  • the two film loop stores 10 and 20 are designed as double labyrinth store 28 with a common internal suction as differential pressure device 30. This represents a particularly simple and compact design of a double memory.
  • For measuring and monitoring the loop depth LT and thus also the loop length L in the storage serve film loop sensors SF (see Fig. 6).
  • FIG. 3 shows a circuit diagram with a machine control 50, a film web and storage controller 52, a control of the toggle geometry 54, a pressure control 56 and a register control 58 for sheetfed or endless web machines 59, as well as associated sensors SF, SB, SP and SD and with an operating and display device 40 for the relevant setting and control functions.
  • the example illustrates the controls of a machine with two independently controllable film webs 6.1, 6.2 with Abwikkelrollen 7.1, 7.2 or take-up rollers 80.1, 80.2 and associated sensors for determining the Abwikkel york V7.1, V7.2 and the take-up speed V8.1, V8. 2 (eg determined from roller diameter and speed).
  • the corresponding feed rates VV1, VV2 are also determined on the film feed devices 24.1, 24.2 (for example by means of encoders on servomotors).
  • optimal film clamping forces FF1, FF2 are directly or indirectly adjustable and controllable. These foil clamping forces FF1, FF2 are tunable to the relevant film web and the selected embossing process that the embossing foils are promoted on the one hand as gently as possible and without overstretching and yet an accurate, straight alignment and positioning of the films is achieved at the embossing site 3 while this and during the Embossing process is optimally adjustable.
  • An additional film-like alignment of the film webs 6 on the clichés 23 of the tool plate 4 can be carried out by means of film image sensors SB1, SB2 (see FIGS. 2 and 15a). This is e.g. necessary for embossing holograms or foil images which are to be positioned in register on the clichés (and from the other side the flat material is positioned with respect to the clichés with the register device).
  • the loop formations in the two memories 10 and 20 are also controlled and monitored, e.g. by film web sensors SF1.1, SF1.2 in the memory 10 and the sensors SF2.1, SF2.2 in the memory 20, which each detect the loop depths LT1.1, LT1.2 and LT2.1, LT2.2.
  • control of the toggle geometry 54 e.g. by adjusting the distance XS of the toggle lever check points and thus influencing the embossing time DT, as well as a control 56 of the pressure force via the positioning device 61 of the press with the aid of pressure force sensors SP1 to SP4 (FIG. 1).
  • a register control 58 for sheetfed machines with sensors SDi and actuators 91, 92, 93 (of FIG. 1, 19) or register control 59 for endless web machines with web stores 110, 120, web edge controls 112, 113 and web advance and web tensioners 124, 125 also provides an advantageous combination.
  • Figure 4 illustrates, in an example with a five-cycle period, the feed control VV, the film advance S (t) and the looping L (t) in the storages as a function of time over several imprinting cycles.
  • a relatively small film advance (of, for example, 7 cm each) takes place over four cycles, followed by a large advance in the fifth cycle (by, for example, 77 cm).
  • FIG. 4b shows this course over the cycles 4, 5 and 1 in more detail.
  • the feed rate S (t) is controlled as balanced as possible without large changes in speed, ie with the lowest possible accelerations (d2S / dt 2 ). This is especially important in the fifth cycle, when large changes in loop length (from L2 to L1) occur in a short time during the unpressurized phase TL of the cycle.
  • the line S7.2 (t) shows by way of example also a different time profile for a second film web 6.2, which here has a higher unwinding speed V7.2.
  • FIG. 4c shows the time variation of the loop length L (t) in the film loop store 10 in accordance with the feed movement S (t) according to FIG. 4b.
  • FIG. 4d shows an enlarged view of the feed S (t) in the cycle 5 and the influence of the adjustment of the embossing time DT and thus also of the pressure phase TP by a toggle lever adjustment according to FIGS. 16-18.
  • a short embossing time DT1 results in a small value of TP1 and remains correspondingly a larger range TL1 for the change of the feed rate VV and for the change of the loop length L in the memories.
  • the film loop 12 runs along the guide walls 16, 17 and parallel to these.
  • the guide walls 16, 17 may be e.g. also conical, wherein the arrangement of guide walls (as well as any side walls) and differential pressure devices is coordinated so that a uniform air flow for optimum formation of the desired film loop in the entire range between minimum loop length L1 and maximum loop length L2 arises.
  • the determination and monitoring of the loop length L takes place here with a distance sensor SF (for example as an optical or ultrasound detector), which is arranged at the memory input and measures the loop depth LT. From LT then the loop length L can be calculated.
  • a distance sensor SF for example as an optical or ultrasound detector
  • Figures 7a, b show a film loop storage with side walls 18, 19 from above and from the side.
  • the example shows a further variant of an adjustable storage geometry, with which, matched to the differential pressure device, an optimal local flow distribution for proper loop formation, for example, of different widths film webs can be adjusted.
  • adjustable side walls 18, 19 or attached lids 22 adjustable openings or slots 13 may be formed.
  • the film loop store according to FIG. 8 has a suction box 15 with an inlet opening 14 for the film webs 6.1, 6.2 and with a suction fan 32 at the loop end or at the lower end of the suction box.
  • Figure 9a, b shows from above and from the side of a Saugkasten Mrs 15 with variable covers 26 at the inlet opening 14.
  • the loop memory can simultaneously record a plurality of film webs 6.1, 6.2 (different type and width), which are supported independently and thus form different loops , In order to achieve optimum flow conditions for each loop, it is possible with the variable coverings 26 to set each film web 6.1, 6.2 to approximately equal size free inlet openings 27 on both sides.
  • the differential pressure devices of the film loop stores can also have suction rolls 34 or suction wall elements 35 with circumferential perforated belts 36, which are advantageously additionally combined with a pressure or suction fan 31, 32.
  • FIG. 10 shows on the input side a suction roll 34 with a suction region 37 for conveying the film web 6 into the store.
  • the loop formation is still supported by a pressure blower 31.
  • a perforated suction wall element 35 with a circumferential perforated belt 36 via the suction and conveying region 37 conveys the film web 6 to form a loop in the store.
  • This memory is suitable e.g. especially good for long loops with very narrow foil webs.
  • FIG. 12 shows a suction wall element 35 with perforated belt 36, the downwardly running region 35. 1 of which forms a transport wall of a supply reservoir 10 and whose upwardly running region 35. 2 forms a transport wall for a discharge reservoir 20.
  • FIG. 13 shows a double memory 29, which has two compartments 16.1, 17.1 and 16.2, 17.2, wherein these two compartments have a plurality of film webs 6.1 to 6.4 alternately and each spaced apart on the compartments. Both compartments can be operated together with only one differential pressure device.
  • Figure 14 illustrates an example of a machine having a plurality of longitudinal and transverse film webs (in the X and Y directions) which are individually independently controllable.
  • Two longitudinal webs 6.1 and 6.2 with feed speeds VV1, VV2 have separate feed devices 24.1, 24.2 and clamping devices 25.1, 25.2 and common film loop stores 10.1, 20.1.
  • Two transverse tracks 6.3, 6.4 with feed speeds VV3, VV4 have separate feed devices 24.3, 24.4 and clamping devices 25.3, 25.4 and common foil stores 10.2 and 20.2.
  • FIG. 15 illustrates an embossing work with several different embossing foil webs with different embossing material and different clichés, which is carried out simultaneously in an embossing process.
  • the arrangement of the film webs in the longitudinal and transverse direction can be coined simultaneously with more clichés and more complex images.
  • Condition is that no clichés are arranged in the crossing regions of the film webs.
  • a sheet 5.1 to be marked is subdivided in the Y-direction into two identical areas.
  • two identical film webs 6.1, 6.2 are embossed with image units corresponding to the clichés 23.1.
  • FIG. 15b shows the pronounced image film web 6.2 and in FIG. 15c the pronounced color film web 6.3 with a 3-cycle period.
  • the arrangement of the film webs and their individual feed control is done so that the Folien Weggegut is used optimally possible.
  • a flat-embossing machine is created, which can perform very demanding and complex embossing tasks in a single pass at high speed and in the best quality and in addition, the film webs little burden and whose stamped good can be utilized to the best extent possible.
  • FIGS. 16 to 18 illustrate the combination of the machine according to the invention with a geometry adjustment or a stamping time adjustment (DT).
  • DT stamping time adjustment
  • the controllable motors 48 and a geometry controller 54 there are also other forms of drive (eg hydraulically or manually) or all four Joints 45 are moved directly with one synchronously controlled motor.
  • the adjustment can be programmable and preferably takes place stepwise only during the depressurized phase (TL).
  • FIG. 17 illustrates the geometry adjustment on one of the toggle lever pairs 43, which are moved by the tie rods 42.
  • the setting XS of the lower joints 45 result different courses of Hubmaxima H (t) of the press as shown in three examples of settings below.
  • the setting XS1 ⁇ 0 results in a maximum deflection position 43a, whereby the toggle levers 43, 43a do not quite reach their stretched position 46.
  • the setting XS2 0
  • the stretched layer 46 is just reached in the maximum deflection position 43b.
  • the height difference DH results from how strong a given flat material 5 to be embossed is compressible. This also results in the stroke of the movement H (t) corresponding course of the pressing force F (t). If in case a) the stretched layer 46 is not fully reached, the tool plate 4 must be readjusted by means of positioning device 61 in the direction Z4, in order to compensate for the missing height H.
  • the embossing machine has sensors SP1 to SP4 for measuring the press compressive forces F (see FIGS. 1 and 16).
  • the pressure control 56 controls by the positioning device 61, the tool plate 4 in the direction Z4, so that a desired predetermined working pressure F can be automatically kept constant.
  • the print controller may also include various press force control functions. With the toggle lever geometry control 54 and the press-pressure control 56, optimum parameter values can thus be set both with regard to the embossing time DT and with respect to the embossing pressure force F, thereby achieving the highest embossing quality and machine performance.
  • This control of the knee lifting geometry and the printing phase can also be used independently of the loop memories according to the invention for optimizing the embossing quality.
  • inventive machine films of different types and widths should be optimally processed.
  • very wide and very thin films with a thickness of eg 15 - 30 ⁇ are extremely difficult to transport properly.
  • the insulating plastic carrier material of the films is charged electrostatically, which may result in relatively high frictional forces on the guide walls (inlet walls 16 and outlet walls 17) of the reservoir, which can lead to distortion and hull formation of the film webs.
  • An important further education The invention consists in keeping the frictional forces of the foil webs running over it, especially at the inlet walls 16 of the loop store, small or reducing them to an extent that the loop formation and transport can take place optimally. Various measures and means for this will be illustrated with reference to FIGS. 19 to 23.
  • Figures 19 and 20 illustrate textured surfaces 63 on the guide walls 16, 17, the contact surface F1 thereof with the overlying foil being substantially smaller than the entire foil covered surface F0.
  • the ratio of contacted to covered area F1 / F0 is less than 50% and is preferably even less, e.g. 10 - 30%.
  • Such structured surfaces 63 can be formed in various ways, e.g. by grooves or channels 64, according to FIG. 19 a and FIG. 20, or by grids, or fine-meshed wire mesh 65 according to FIG. 91 b or by perforated sheets, dimpled sheets or corrugated sheet metal 66 according to FIG.
  • the lattice constants or pitches of these patterned surfaces are preferably only 1 mm or less, e.g. 0.3-1 mm.
  • FIG. 20 shows in plan view an example of a structured surface with longitudinal and transverse channels 64, an area ratio F1 / F0 of approximately 25% being illustrated here.
  • FIG. 21 Another particularly simple and effective method for reducing the Kontak vomanteils F1 or the frictional force of the film web on the inlet wall 16 is to partially detach the film web by partial injection of air from the inlet wall.
  • the inlet wall 16 has injection holes 75, through which from a pressure chamber 74 locally air is blown under the film.
  • This air-assisted reduction of the friction force at the inlet wall is, according to the films to be transported, easily metered by means of controlling the overpressure P3 in the chambers 74. This may e.g. 2-4 bar amount.
  • the blow-off openings 75 are preferably relatively small dimesioniert and arranged at great distances from each other. The diameter of the blow-off openings is e.g.
  • the guide walls are metallically conductive and the ventilated inlet walls can have a smooth surface (FIG. 21) or a structured surface (FIG. 20).
  • Fig. 22 shows a further variant for reducing the frictional force by applying a potential U2 to the inlet wall 16 with an adjustable voltage source 96.
  • the inlet wall is metallically conductive and formed isolated from the environment.
  • the potential difference U1 - U2 between the film web 6 and the guide wall 16 is reduced so much that the desired low value of the frictional force is achieved.
  • the setting of the potential U2 at the inlet wall 16 is such that an optimal smooth looping and film guide is achieved.
  • the potential U1 of the film web 6 can be determined by means of a capacitive potential probe 95 and then the potential U2 can be adjusted or regulated.
  • Fig. 23 shows an example, each with a double-pocket memory 29 before and after the embossing press and each with a film web 6.1, 6.2 in a respective compartment of these two double-pocket memory.
  • the loop formation in the reservoirs takes place by vacuum suction by means of a common exhaust fan 32.
  • the four inlet walls 16. 1, 16. 2 have a ventilation with overpressure chambers 74 with a pressure P 3 and injection openings 75.
  • the four outlet walls 17.1, 17.2 are expressly not ventilated.
  • the friction force at the outlet walls is intentionally higher than at the inlet walls, so that the film web is slightly stretched for the purpose of further transport.
  • a trailing wheel 53 with encoder detects here speed and feed of the running film web, whereby the motor of the take-up roll 80 and feed and looping are controlled in the memories.
  • FIG. 24 shows the combination of the flat embossing machine according to the invention with a register control 58 of the flat material.
  • This combination allows a two-sided optimization both film web side with respect to the film guide and alignment as well as with respect to the flat material guide for accurate image alignment.
  • On the film side e.g. Folienin such as holograms or foil images by means of the film image sensors SB (Fig. 15a, Fig. 2) with respect to the clichés 23 on the tool plate 4 exactly aligned, while the sheets are also aligned by the 5.1 register position accurate to the position of the clichés.
  • Such register control for sheetfed presses is known from EP-A-708 046.
  • the indexing machine 70 for flat embossing machines has front edge stops, a side stop and position sensors SD1, SD2, SD3 for detecting print marks M1, M2, M3 of the sheet 5.1 and two detectors SD4, SD5 associated with the front stops A1, A2 for detecting the sheet leading edge.
  • the front stops A1, A2 are adjustable so far by actuators 91, 92 until the front print marks M1, M2 of the sheet are detected by the corresponding sensors SD1, SD2.
  • An actuator 93 then adjusts the side stop or side shift A3 until the side print mark M3 is detected by the assigned position sensor SD3.
  • a register controller 58 controls this register correction with the position sensors SD1, SD2, SD3, the detectors SD4, SD5, and the actuators 91, 92, 93. This easily provides a reliable automatic register correction for each individual sheet and thus increases in combination with me the film guide and control the print quality.
  • FIG. 25 shows schematically from above a register control 59 for endless web machines (FIG. 2) with sensors SD1, SD3 for detecting print marks M1, M3.
  • the endless web 5.2 runs from a supply reel 107 to a take-up reel 108 with web edge controls 112, 113, web stores 110, 120 (designed as dancer rolls or also as a suction store), a web tensioning device 125 and a web feed device 124.
  • the alignment of the endless web in the transverse direction Y onto the print mark M3 is performed by the rail edge controls 112, 113 known per se, and the alignment with the mark M1 in the longitudinal direction X is controlled by the web feed device 124.
  • web stores 110 and 120 for the continuous web 5.2 are also used here in an analogous manner to the film web control.

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Claims (27)

  1. Machine de repoussage pour un matériau plat (5) à repousser, comportant une presse de repoussage (2), une table de repoussage (3), une plaque d'outil (4) et au moins une bande de feuille de repoussage (6) qu'un rouleau dérouleur (7) quide au-dessus de la table de repoussage en direction d'un dispositif (8) d'évacuation de feuille, avec un dispositif (24) d'avancement de feuille disposé sur un côté de la presse et un dispositif tendeur (25) pour tendre la bande de feuille de repoussage (6), situé de l'autre côté de la presse, et avec une commande (52) correspondant au cycle de repoussage (T0) de l'avancement de la feuille à l'endroit du repoussage, par laquelle la bande de feuille de repoussage est maintenue à l'arrêt sur la table de repoussage (3) pendant la phase de poussée (TP) et est avancée jusque dans la position de repoussage suivante pendant la phase sans poussée (TL), des différences de vitesse entre la vitesse d'avancement VV à l'endroit du repoussage et la vitesse de la bande V7 au niveau du rouleau dérouleur ou sur le dispositif d'évacuation V8 étant compensées,
    caractérisée par
    au moins une réserve de feuille en boucle (10) située en amont de la presse, avec un dispositif (30) à pression différentielle pour la formation d'une boucle de feuille (12) au moyen d'une différence de pression d'air (DP) exercée sur la bande de feuille de repoussage, la bande de feuille de repoussage (6) étant guidée de manière plane et parallèle le long de parois de guidage (16, 17) avec une force de frottement entre la bande de feuille de repoussage et les parois de guidage, la commande (52) commandant la formation de la boucle par agrandissement et réduction correspondante des boucles (L1, L2) de réserve de feuille (10, 20) pour compenser les différences de vitesse, et la bande de feuille de repoussage (6) étant étirée vers l'avant avec une accélération continue pendant la phase sans poussée (TL) et avec un ralentissement continu dans la position de repoussage suivante, c'est-à-dire avec des accélérations (d2S/dt2) les plus petites possible.
  2. Machine de repoussage selon la revendication 1, caractérisée par une autre réserve de feuille en boucle (20) et un rouleau enrouleur (80) situés en aval de la presse et servant de dispositif (8) d'extraction de feuille.
  3. Machine de repoussage selon la revendication 1 ou 2, caractérisée en ce que le dispositif à pression différentielle présente un ventilateur de refoulement (31) et/ou un ventilateur d'aspiration (32) aptes à être commandés, qui créent un écoulement d'air ajustable qui s'étend essentiellement dans la direction de l'extension de la boucle dans la réserve de feuille, et en ce que les réserves de feuille en boucle présentent deux parois de guidage (16, 17) qui s'étendent parallèlement aux boucles de feuille (12).
  4. Machine de repoussage selon l'une des revendications précédentes, caractérisée en ce que les réserves de feuille en boucle présentent une géométrie (13, 26) ajustable pour modifier la répartition locale de l'écoulement.
  5. Machine de repoussage selon la revendication 3, caractérisée en ce que les réserves de feuille en boucle présentent également deux parois latérales (18, 19) dotées d'ouvertures (13) ajustables.
  6. Machine de repoussage selon l'une des revendications précédentes, caractérisée en ce que les réserves de feuille en boucle présentent un caisson d'aspiration (15) doté d'une ouverture d'entrée (14) pour la bande de feuille et d'une aspiration (32) à l'extrémité de la boucle.
  7. Machine de repoussage selon l'une des revendications précédentes, caractérisée en ce que la réserve de feuille en boucle présente une ouverture d'entrée (14) munie de recouvrements (26) variables et en ce que les réserves de feuille en boucle présentent des deux côtés d'une bande de feuille des ouvertures d'admission (27) libres, essentiellement de même taille.
  8. Machine de repoussage selon l'une des revendications précédentes, caractérisée en ce que les réserves de feuille en boucle présentent un cylindre d'aspiration (34) ou une paroi perforée (36) avec ventilateur d'aspiration (32) comme moyen de transport de la feuille dans la réserve.
  9. Machine de repoussage selon l'une des revendications précédentes, caractérisée en ce que les réserves de feuille en boucle présentent un élément (35) de paroi d'aspiration, fixe, perforé, avec une dépression du côté intérieur, entouré par une bande perforée (36) pour ainsi réaliser un transport continu de la feuille.
  10. Machine de repoussage selon la revendication 9, caractérisée en ce que la bande perforée entoure une paroi d'aspiration à deux faces, chaque fois par une région qui s'avance vers le haut (35.1) et une région qui s'avance vers le bas (35.2) qui forment chacune une paroi de guidage pour deux réserves de feuilles (10, 20) voisines.
  11. Machine de repoussage selon l'une des revendications précédentes, caractérisée par des capteurs (SF1, SF2) pour la surveillance de la formation des boucles, en particulier des capteurs de distance pour la mesure de la profondeur de la boucle (LT), et qui présentent par exemple la forme de détecteurs optiques ou à ultrasons.
  12. Machine de repoussage selon l'une des revendications précédentes, caractérisée en ce que plusieurs bandes de feuille (6.1, 6.2, 6.3) sont disposées les unes à côté des autres avec des espaces intermédiaires dans les réserves de feuille, et en ce que plusieurs bandes de feuille (6.1, 6.2) sont dotées de dispositifs séparés d'avancement (24.1, 24.2) dont l'avancement (VV1, VV2) peut être commandé individuellement.
  13. Machine de repoussage selon l'une des revendications précédentes, caractérisée en ce que les réserves de feuille sont configurées comme réserves (28, 29) à double boucle pour plusieurs bandes de feuille.
  14. Machine de repoussage selon l'une des revendications précédentes, caractérisée en ce que plusieurs bandes de feuille à repousser (6.1-6.4) sont dotées de réserves de feuille associées qui s'étendent parallèlement et/ou transversalement par rapport à la direction d'avancement X du matériau plat.
  15. Machine de repoussage selon l'une des revendications précédentes, caractérisée en ce que des moyens pour réduire la force de frottement exercée sur une bande de feuille (6) en déplacement sont prévus au moins sur les parois d'entrée (16) des boucles de réserve, de telle sorte que la force de frottement sur les parois d'entrée (16) soient plus faibles que la force de frottement sur les parois de sortie (17).
  16. Machine de repoussage selon l'une des revendications précédentes, caractérisée en ce que la partie F1 de la surface de contact d'une bande de feuille avec les surfaces de guidage (16, 17) des boucles de réserve est inférieure à la moitié de la surface recouverte FO de la feuille, avec par exemple F1/F0 = 10 - 30 %.
  17. Machine de repoussage selon la revendication 16, caractérisée en ce qu'au moins les parois d'entrée (16) présentent une surface (63) structurée, par exemple en forme de canaux (64), de treillis de fil à fine maille (65), de tôle repoussée ou de tôle ondulée (66).
  18. Machine de repoussage selon l'une des revendications précédentes, caractérisée en ce que sur les parois d'entrée (16), de l'air provenant de chambres sous surpression (74) est soufflé dans les réserves en boucle par des ouvertures de soufflage (75).
  19. Machine de repoussage selon la revendication 18, caractérisée en ce que de petites ouvertures de soufflage, par exemple d'un diamètre de 0,5 à 1 mm, sont prévues à distance mutuelle relativement grande, par exemple de 5 à 20 cm.
  20. Machine de repoussage selon l'une des revendications précédentes, caractérisée en ce qu'un potentiel U2 est appliqué au moyen d'une source de tension ajustable (96) sur des parois d'entrée (16) métalliques conductrices.
  21. Machine de repoussage selon la revendication 20, caractérisée en ce qu'une sonde capacitive de potentiel (95) pour la détermination du potentiel U1 de la bande de feuille entrante (6) et pour la commande correspondante du potentiel U2 est prévue sur la paroi d'entrée (16).
  22. Machine de repoussage selon l'une des revendications précédentes, caractérisée en ce qu'une presse à genouillère (41) est prévue, la géométrie des genouillères pouvant être ajustée (XS) pour modifier ainsi la phase de poussée (TP).
  23. Machine de repoussage selon la revendication 22, caractérisée en ce que la géométrie des genouillères peut être ajustée par modification de la distance (XS) entre les articulations (45) des genouillères.
  24. Machine de repoussage selon la revendication 22, caractérisée en ce que l'ajustement s'effectue par une commande (54) au moyen de moteurs (48) asservis, par exemple au moyen de servomoteur et d'un biseau de déplacement, et en ce que le déplacement peut être programmé et est réalisé pas-à-pas pendant la phase sans poussée (TL) lorsque la machine tourne.
  25. Machine de repoussage selon la revendication 22, caractérisée en ce qu'en même temps, un dispositif de positionnement (61) permet d'ajuster la position de la plaque d'outil (4) par une commande de poussée (56) dotée d'un programme de commande et de capteurs de pression (SP).
  26. Machine de repoussage selon l'une des revendications précédentes pour des feuilles comme matériau plat, caractérisée en ce qu'un dispositif de transport de feuilles (5.1) avec margeur et bras, ainsi qu'un dispositif (70) de repérage d'avancement avec une commande de repérage (58) et des butées avant et latérales (A1, A2, A3) commandées par capteurs permet d'orienter la feuille en fonction des repères de poussée (M1, M2, M3) qui sont détectés par les capteurs (SD).
  27. Machine de repoussage selon l'une des revendications 1 à 25 pour une bande sans fin comme matériau plat, caractérisée par une commande de repérage (59) pour l'orientation et la commande de la bande sans fin (5.2) en fonction de repères de poussée (M1, M3) au moyen de capteurs (SD1, SD3), la commande dans la direction transversale s'effectuant par une commande des bords de bande (112) et dans la direction longitudinale par commande de l'avancement (124) de la bande sans fin.
EP98101498A 1997-02-13 1998-01-29 Presse d'estampage à plat Expired - Lifetime EP0858888B2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
CH31297 1997-02-13
CH31297 1997-02-13
CH312/97 1997-02-13

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EP0858888A3 EP0858888A3 (fr) 1999-02-17
EP0858888B1 EP0858888B1 (fr) 2002-09-11
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EP0858888A2 (fr) 1998-08-19
DE59805462D1 (de) 2002-10-17
EP0858888B1 (fr) 2002-09-11
EP0858888A3 (fr) 1999-02-17
US5979308A (en) 1999-11-09

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