EP0727309B1 - Machine for the multi-colour silk-screen printing of containers with curved surfaces - Google Patents

Machine for the multi-colour silk-screen printing of containers with curved surfaces Download PDF

Info

Publication number
EP0727309B1
EP0727309B1 EP96200335A EP96200335A EP0727309B1 EP 0727309 B1 EP0727309 B1 EP 0727309B1 EP 96200335 A EP96200335 A EP 96200335A EP 96200335 A EP96200335 A EP 96200335A EP 0727309 B1 EP0727309 B1 EP 0727309B1
Authority
EP
European Patent Office
Prior art keywords
containers
printing
machine
mandrel
shaft
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
EP96200335A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0727309A1 (en
Inventor
Giovanni C/O Tecno 5 - S.A.R.L. Bormioli
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.)
TECNO 5 - A RESPONSABILITA' LIMITATA Soc
Original Assignee
TECNO 5 - A RESPONSABILITA' LIMITATA Soc
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 TECNO 5 - A RESPONSABILITA' LIMITATA Soc filed Critical TECNO 5 - A RESPONSABILITA' LIMITATA Soc
Priority to SI9630028T priority Critical patent/SI0727309T1/xx
Publication of EP0727309A1 publication Critical patent/EP0727309A1/en
Application granted granted Critical
Publication of EP0727309B1 publication Critical patent/EP0727309B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F15/00—Screen printers
    • B41F15/08—Machines
    • B41F15/0872—Machines for printing on articles having essentially cylindrical surfaces

Definitions

  • This invention relates generally to a silk-screen printing machine for containers with curved surfaces and in particular to a multi-colour silk-screen printing machine of high productivity.
  • a typical but not exclusive use of the invention is in the decoration of cylindrical or conical glass containers.
  • silk-screen printing machines comprising a loading station for the containers to be silk-screen printed, a series of printing stations and a discharge station for the printed containers, said printing stations being angularly equidistant along a horizontally extending circular path, tangential to which the screens of the printing stations can travel and along which a number, equal to the number of these latter, of radial mandrels are rotated with stepwise movement through an angle equal to the angle between said printing stations, the mandrels each supporting a coaxial container, typically by virtue of vacuum created within them.
  • such known machines comprise four printing stations and hence six stations in all, spaced angularly apart by 60°.
  • All or some of the printing stations may be used, depending on the number of component colours of the silk-screen printing.
  • the main object of the present invention is to provide a multi-colour silk-screen printing machine which for like numbers of printing stations and colours has a much higher productivity than known machines.
  • each mandrel with two endpieces arranged symmetrical about the longitudinal axis of the mandrel, two printing stations being provided for each constituent colour of the silk-screen printing to be applied to the containers.
  • the two endpieces associated with each mandrel are preferably arranged such that they lie in the vertical plane passing through the longitudinal axis of the mandrel when this latter halts on termination of one step, the two stations for applying one and the same colour preferably being positioned one following the other.
  • each mandrel there is associated a drive member which rotates the mandrel through 180° during its transfer from one station to the next, the two endpieces supported by each mandrel being linked together such that during the printing of one container the other container becomes arranged in the correct starting position for its printing.
  • said drive member consists preferably of a bevel gear keyed onto the rotating shaft of the mandrel and engaging a fixed bevel ring gear positioned coaxially to the circular path followed by said mandrel and having a pitch circle diameter of 1/(N+1) times the pitch circle diameter of said ring gear, where N is the number of constituent colours of the multi-colour silk-screen printing.
  • N 2
  • the pitch circle diameter of said gear is 1/3 of that of said ring gear
  • the printing stations are four in number, hence a total of six stations are provided including the loading and discharge stations.
  • Each endpiece is provided with a coaxial pinion arranged to engage a drive rack associated with each printing station.
  • this consists preferably of two identical mutually engaging gears mounted on the respective rotation shafts of said endpieces.
  • At least one of said two gears is mounted idly on its shaft by way of a friction clutch device, between said endpiece rotation shafts and said mandrel shaft there being preferably interposed means able to arrange the endpieces in their correct starting position for operation.
  • said means comprise, for each endpiece, a ratchet device comprising a pawl pivoted to the mandrel shaft and elastically urged towards the rotation shaft of its own endpiece, and comprising a tooth arranged to engage, with unilateral engagement, a conjugate engagement seat associated with the endpiece rotation shaft.
  • the two ratchet devices operate in opposition such that during each printing stage the ratchet device associated with the container undergoing printing disengages, whereas the other ratchet device engages.
  • the machine comprises a base 1 ( Figures 1, 2) from which a fixed central vertical shaft 2 upwardly extends.
  • the platform 4 On the platform 4 there are provided six angularly equidistant identical radial mandrels 5 described hereinafter, the platform 4 being rotated in the direction A ( Figure 1) through successive angular steps of 60°.
  • angularly equidistant operating stations are associated with the base 1, namely a loading station ( Figures 1, 2) for the containers 7 to be silk-screen printed, four printing stations 8, of which only one is shown partially in Figure 4, and a discharge station 9 ( Figure 1) for the printed containers 7.
  • the direction of rotation of the platform 4 is such that the first pair of printing stations 8 applies a first colour to the containers 7, and the second pair of printing stations 8 applies another colour to the same containers 7.
  • the loading station 6 comprises a horizontal conveyor belt 10 provided at its upstream end with an arranging screw 11 for the containers 7, and at its downstream end with a gripping and lifting device for the containers 7 to be silk-screen printed.
  • the containers 7 are glass bottles, but it is apparent that the machine of the invention is suitable for the multi-colour silk-screen printing of other containers having a cylindrical part, such as glass jars and cans and bottles of other material. Moreover, as is well known to the expert of the art, there is nothing to prevent the invention being used for printing conical containers. For example the invention can be used to decorate the frusto-conical part between the body and the mouth of the illustrated containers 7.
  • the belt 10 is preferably driven with continuous uniform linear speed, and the spacing screw 11 is preferably rotated with continuous uniform peripheral speed.
  • the motion of said belt 10 and said screw 11 can either be derived from the mechanism which drives the platform 4 or be provided by a separate motor unit. In either case the resultant motion of each is in perfect synchronism with the rotation of the platform 4.
  • the screw 11 is specifically formed to continuously provide on the belt 10 an alignment of identical groups of containers 7, said groups being spaced equally apart, each individual group comprising two containers 7 spaced apart by a distance substantially equal to the distance between the axes of the pair of endpieces 30 associated with each mandrel 5, described hereinafter.
  • the gripping and lifting device for the containers 7 comprises two jaws 12 the active surfaces of which are each provided with two recesses spaced apart by a distance equal to the distance between the containers 7 of each pair arriving from the belt 10.
  • the jaws 12 are provided at the end of two rocker arms 13, the other ends of which are pivoted, on respective perpendicular axes 14, to a common support sleeve 15.
  • one of said jaws 12 (that to the left in Figure 3) is rigidly fixed to its arm 13, whereas the other jaw (that to the right) is connected to its arm 13 by a perpendicular pin (120) so that it can swivel slightly in the two opposing directions.
  • a perpendicular pin 120
  • the arms 13 are provided with respective mutually engaging toothed sectors 160, with one of said toothed sectors 160 or with the corresponding arm 13 there being associated a lever (not shown) for opening and closing the jaws 12 in synchronism with the operating stages of the machine.
  • the common support sleeve 15 for the arms 13 is rotatably mounted on a horizontal shaft 16 positioned tangential to the platform 4, and is provided with a control means causing it to rock in the two opposing directions about said shaft 16.
  • Said control means for example consisting of a transverse lever, is arranged to alternately position the jaws 12 in a lowered position in which they embrace a pair of containers 7, and in a raised position in which they arrange these latter horizontally.
  • the shaft 16 carrying the sleeve 15 is positioned on a movable member 17, for example in the form of a horizontal slide or carriage, able to slide radially to the central machine shaft 2.
  • a movable member 17 By virtue of said movable member 17, the jaws 12 are arranged alternately in a position in which they embrace the upright containers 7 arriving from the belt 10, and in a position in which they insert the open ends of the horizontal containers 7 into the endpieces 30 of the mandrel 5 which at that moment is at rest in the loading station 6.
  • discharge station 9 is formed substantially as the aforedescribed loading station 6, for which reason said discharge station 9 is not shown.
  • the discharge station 9 is provided with a gripper device of the aforedescribed type for gripping and lowering the silk-screen printed containers 7, and a conveyor for removing them.
  • each printing station 8 comprises an interchangeable screen 18 supported, in a manner allowing radial adjustment, by an overlying flat frame 19.
  • the frame 19 is slidingly mounted on two horizontal cylindrical bars 20 (of which only one is visible in the figures) positioned tangential to the platform 4, said frame 19, on that side thereof facing this latter, supporting a horizontal rack 21 positioned tangential to the platform 4.
  • respective means are associated with said bars 20 and said blade 22 to alternately position said members in a raised rest position (during the stepwise rotation of the platform 4), and in a lowered working position (during printing).
  • Means are also provided to cause the screen 18 to undergo complete outward and return travel.
  • each printing station there is associated a member, for example in the form of a movable seat, arranged to cooperate with the upper endpiece 30 of the mandrels 5 to ensure that the upper containers 7 remain horizontal during printing.
  • Said member of normal use in this sector, is positioned on the base 1 and is arranged to alternately move between a rest position in which it is situated outside the path followed by the container 7 (during the rotation of the platform 4), and a working position in which it is in contact with the base of the container 7 (during printing).
  • each radial mandrel 5 comprises a sleeve 23 fixed to the platform 4 and rotatably carrying a through shaft 24.
  • a bevel gear 25 engaging the fixed ring gear, on the outer end of the shaft there being keyed a hollow profiled transverse body 26.
  • the pitch circle diameter of the gear 25 is 1/3 of the pitch circle diameter of the ring gear 3, so that for each step of the platform 4 the shaft 24 rotates about itself through 180°.
  • bearings 27 there are rotatably mounted on said body 26 two through shafts 28 which are parallel to the longitudinal axis 55 of the mandrel 5 and are arranged symmetrical thereabout.
  • said shafts 28 are situated respectively above and below said longitudinal axis 55.
  • a disc 29 is keyed on the inner end of each shaft 28, and an endpiece 30 is keyed on the outer end thereof.
  • the disc 29 is provided peripherally with a conjugate coupling seat 130 ( Figure 6) for unilateral engagement by the tooth 300 of a pawl 31 which is pivoted to the body 26 on an axis 32 parallel to the shaft 28, and is constantly forced towards said seat 130 by a taut spring 33.
  • Each endpiece 30, which is interchangeable for obvious reasons, comprises a tube 33 (see Figure 4) removably fixed to the shaft 28, a pinion 34 secured to the inner end of the tube 33 and arranged to engage the rack 21, a socket-shaped portion 35 for receiving and centering the mouth of the container 7, and a cylindrical skirt 36 of relatively soft material (such as rubber) able to make sealed contact with that part of the container 7 located behind its mouth.
  • the pinion 34 has a pitch circle diameter equal to the outer diameter of the cylindrical portion of the containers 7.
  • each mandrel 5 also comprises a hole 360 which via suitable channels provided on said shaft 24 and on said shafts 28 leads to said socket-shaped portion 35.
  • said hole 360 is connected to a pneumatic distributor unit which during machine operation maintains the socket-shaped portions 35 under vacuum to enable them to support the containers 7, and which each time a mandrel 5 reaches the discharge station 9 breaks the vacuum in said portions 35 or blows air into them, after the respective containers 7 have been gripped by the gripper device associated with the discharge station 9.
  • This latter comprises, staring from a flange 38 rigid with the shaft 28 and proceeding towards the right with reference to Figure 5, a first holed disc 39 of high coefficient of friction (such as a disc of brake lining material), said gearwheel 37, a second holed disc 390 of high coefficient of friction, a holed thrust disc 40, a cup spring 41, and a tightening and adjustment nut 42 screwed onto a threaded portion of the shaft 28.
  • the two discs 39 and 390 and the gearwheel 37 are mounted as an exact fit on a bush 43 idly mounted on the shaft 28, whereas said disc 40 and said spring 41 are directly mounted on said shaft 28.
  • said friction clutch (or clutches) is to ensure the correct initial operating position of the endpieces 30, this being established by the engagement between the teeth 300 and the respective seats 130 as shown in Figure 6, and which if lacking would result in a certain number of containers 7 not being printed as desired.
  • Such situations can in particular pertain at the beginning of a production shift, and especially after maintenance, adjustment and replacement of parts.
  • the aforedescribed machine operates as follows.
  • the two containers 7 which have just been loaded are transferred to the first printing station, during which transfer they are subjected to a simultaneous rotation through 180° about the axis 55 of the respective mandrel 5 (in the direction B of Figure 6) by virtue of the engagement between the bevel gear 25 and the ring gear 3.
  • the extent of rotation of the container 7 about itself depends on the type of decoration to be applied, for example it can be either much less than 360°, as in the case of decoration consisting of a narrow longitudinal band, or much more than 360°, as in the case of decoration in the form of a spiral.
  • the blade 22 When printing is finished the blade 22 is raised, the screen 18 is raised, the movable seat is withdrawn from the base of the upper container 7, the frame 20 is returned to its initial position, and the platform 4 moves through a further step with simultaneous rotation of the two containers 7 about the axis 55.
  • a first single-colour silk-screen printing is applied in the first two printing stations 8 to the two containers 7 carried by one and the same mandrel 5, and a second single-colour silk-screen printing is applied to the same two containers 7 in the last two printing stations 8.
  • the two printing stations operating with one of said two different colours can be alternated with the two printing stations operating with the other colour, particularly if the two different colour applications forming the decoration are not superimposed.
  • each mandrel 5 carries two containers 7 each time as described, with multi-colour silk-screen printing of three or more colours being applied to each container 7.
  • the platform 4 will then be rotated through successive steps of 45°, the pitch circle diameter of the bevel gear 25 associated with each mandrel being 1/4 of the ring gear 3, so that for each step of the platform 4 the shaft 24 of each mandrel 5 rotates through 180°.
  • the pitch circle diameter of the bevel gear 25 is 1/(N+1) times the pitch circle diameter of the ring gear 3, where N is a whole number equal to the number of component colours of the multi-colour silk-screen printing.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Printing Methods (AREA)
  • Screen Printers (AREA)
EP96200335A 1995-02-16 1996-02-13 Machine for the multi-colour silk-screen printing of containers with curved surfaces Expired - Lifetime EP0727309B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SI9630028T SI0727309T1 (en) 1995-02-16 1996-02-13 Machine for the multi-colour silk-screen printing of containers with curved surfaces

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITRE950008 1995-02-16
IT95RE000008A IT1279912B1 (it) 1995-02-16 1995-02-16 Macchina per la stampa serigrafica a piu' colori di contenitori con superfici curve.

Publications (2)

Publication Number Publication Date
EP0727309A1 EP0727309A1 (en) 1996-08-21
EP0727309B1 true EP0727309B1 (en) 1998-10-21

Family

ID=11398700

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96200335A Expired - Lifetime EP0727309B1 (en) 1995-02-16 1996-02-13 Machine for the multi-colour silk-screen printing of containers with curved surfaces

Country Status (7)

Country Link
EP (1) EP0727309B1 (da)
AT (1) ATE172405T1 (da)
DE (1) DE69600802T2 (da)
DK (1) DK0727309T3 (da)
ES (1) ES2124058T3 (da)
IT (1) IT1279912B1 (da)
SI (1) SI0727309T1 (da)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015219975A1 (de) 2015-10-14 2017-04-20 Krones Ag Verfahren zum individuellen Bedrucken von Behältern
DE102015219973A1 (de) 2015-10-14 2017-05-04 Krones Ag Verfahren zum individuellen Bedrucken von Behältern

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
PE34797A1 (es) * 1995-06-01 1997-09-22 Vidriera Monterrey S A De C V Metodo y maquina para el decorado de envases o articulos similares
DE10010591C2 (de) * 2000-03-03 2003-10-30 Isimat Gmbh Siebdruckmaschinen Rundschalttischmaschine
US6490971B2 (en) 2001-02-16 2002-12-10 Steven S. Rosenberg Apparatus and method for framing a printing screen
FR2857901B1 (fr) 2003-07-21 2005-09-23 Dubuit Mach Poste et procede d'impression par serigraphie
KR20170048375A (ko) 2014-08-01 2017-05-08 코닝 인코포레이티드 스크린 프린팅 장치 및 방법
CN109703191A (zh) * 2018-12-03 2019-05-03 赣州润达服装有限公司 一种针织快速定位印花装置

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3026003A (en) * 1956-12-04 1962-03-20 Rejafix Ltd Silk screen printing machines

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015219975A1 (de) 2015-10-14 2017-04-20 Krones Ag Verfahren zum individuellen Bedrucken von Behältern
DE102015219973A1 (de) 2015-10-14 2017-05-04 Krones Ag Verfahren zum individuellen Bedrucken von Behältern

Also Published As

Publication number Publication date
ATE172405T1 (de) 1998-11-15
EP0727309A1 (en) 1996-08-21
IT1279912B1 (it) 1997-12-18
ES2124058T3 (es) 1999-01-16
DE69600802D1 (de) 1998-11-26
DE69600802T2 (de) 1999-03-11
DK0727309T3 (da) 1999-06-28
ITRE950008A1 (it) 1996-08-16
SI0727309T1 (en) 1999-02-28

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