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EP2064011B1 - Machine à faire des agrafes - Google Patents

Machine à faire des agrafes Download PDF

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Publication number
EP2064011B1
EP2064011B1 EP07789592A EP07789592A EP2064011B1 EP 2064011 B1 EP2064011 B1 EP 2064011B1 EP 07789592 A EP07789592 A EP 07789592A EP 07789592 A EP07789592 A EP 07789592A EP 2064011 B1 EP2064011 B1 EP 2064011B1
Authority
EP
European Patent Office
Prior art keywords
staples
band
another
machine according
sets
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.)
Not-in-force
Application number
EP07789592A
Other languages
German (de)
English (en)
Other versions
EP2064011A1 (fr
Inventor
Roberto Risi
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.)
Ratec Srl
Original Assignee
Ratec Srl
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 Ratec Srl filed Critical Ratec Srl
Publication of EP2064011A1 publication Critical patent/EP2064011A1/fr
Application granted granted Critical
Publication of EP2064011B1 publication Critical patent/EP2064011B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21F—WORKING OR PROCESSING OF METAL WIRE
    • B21F45/00—Wire-working in the manufacture of other particular articles
    • B21F45/16—Wire-working in the manufacture of other particular articles of devices for fastening or securing purposes
    • B21F45/24—Wire-working in the manufacture of other particular articles of devices for fastening or securing purposes of staples; of belt-fastening elements

Definitions

  • the present invention relates to a machine for making metal staples.
  • the present invention relates to an automatic machine for making staples of various types and dimensions.
  • metal staples may have a substantially U-shaped profile or a straight profile or an L- or a T-shaped profile.
  • metal staples are used in various sectors and for a variety of purposes.
  • staples are used in offices to join sheets of paper and are applied using suitable machines called staplers.
  • Metal staples are also used in the building industry and carpentry (in which they are considerably larger than those used in the textile sector or in offices) for fixing wooden boards.
  • metal staples relate to the sector for material transport and logistics. Wooden "pallets” are mainly assembled using metal staples applied with suitable tools which are usually pneumatic. Similarly, even common wooden boxes containing fruit and vegetables are assembled using metal staples, like cardboard boxes.
  • Such staples are normally made in automatic machines fed with a continuous band of metal material arriving directly from a rolling mill or fed using reels.
  • Said band or strap is made by drawing near and gluing a predetermined number of metal wires.
  • the band is fed to the machine at a feed station. In said station the band is prepared for subsequent processing.
  • the machine then alternately cuts the band into a succession of pieces having predetermined dimensions.
  • the cutting operations are usually carried out in a station in which there is a press whose movable element supports a respective blade, or knife, able to move from the top downwards and designed to cut the band by opposing a second fixed contact blade.
  • each piece is fed parallel with itself into a station adjacent to the first, where it is then bent to achieve its final shape by a punch and a die able to move relative to one another alternately.
  • the punch is usually supported by and integral with the movable element of the press which performs the previous cutting operation.
  • the substantially U-shaped bend is made along a direction perpendicular to the longitudinal extension of the wires of which the band consists.
  • the pieces therefore form a set of metal staples to be inserted in a stapler designed to apply the staples on the surfaces to be fixed.
  • the punch and die are shaped in such a way as to obtain the required shape of the set of staples.
  • Each array of metal wire is fed to the forming station with the wires parallel to the advancing direction.
  • the first U shape is given by two forming tools which are closed like a press one onto the other.
  • the precision of the finished product is unacceptable, since there are no check and adjusting devices. If the dimensions of the staples change from one production batch to another, the machine has to be stopped and important mechanical parts substituted, including the knives, punches and relative dies and their supports, since both the cutting operation and the bending operation take place close to one another. There is no type of equipment for transferring the piece after cutting.
  • the aim of the present invention is therefore to overcome the above-mentioned disadvantages by producing an automatic staple making machine which is fast, reliable and able to make high quality metal staples.
  • the numeral 1 denotes a machine for making metal staples 2 from a continuous band 3 or strap wound in a reel 4, illustrated in Figure 1 , the band 3 having a respective starting end and final end.
  • the band 3 schematically illustrated in Figure 1 with a dashed line, comprises a plurality of metal wires 5 kept side by side by gluing.
  • the band 3 may be fed directly from a known type of system for drawing, rolling, gluing and/or assembly.
  • the machine 1 comprises a processing line 6 along which there is a plurality of stations designed to perform respective operations on the band 3.
  • the processing line 6 comprises longitudinal sliding guides for the band 3.
  • the machine 1 comprises a station 7 for preparing the band 3, the station 7 in turn comprising a first 8 guillotine for cutting the starting end of the band 3 and eliminating any defects on the end, for example due to manual band 3 cutting.
  • the station 7 for preparing the band 3 there is also a second guillotine 9, a calender 11 and means for detecting the presence of the band 3.
  • the second guillotine 9 is designed to cut the final end of the band 3 and is inserted, along the processing line 6, between the first guillotine 8 and the calender 11.
  • the calender 11 comprises a plurality of opposite rollers 13 through which the band 3 slides, and a calender 11 adjusting mechanism 14, said mechanism 14 varying the distance between the calender 11 rollers 13.
  • the preparation station 7 comprises a pair of motor-driven rollers 10 designed to feed the band along the processing line, unwinding it from the reel 4.
  • the cutting station 18 comprises a first and a second knife 19, 20 and a first and a second movable element 21, 22 for supporting and moving the knives 19, 20.
  • each movable element 21, 22 comprises a projecting support 23 connected to two eccentric rotary elements 24, the eccentric elements 24 transmitting motion to the projecting support 23.
  • actuator means 25 for the movable elements 21, 22 are also provided.
  • the first knife 19 is associated with the first movable element 21 and the second knife 20 is associated with the second movable element 22.
  • Each knife 19, 20 is also connected to the respective movable element 21, 22 at the projecting support 23 at three points M1, M2, M3, which are aligned with one another.
  • Elastic elements 26 are inserted between the blade 19, 20 and the projecting support 23 at the points M1, M2 and M3.
  • the elastic elements are 26 Belleville washers.
  • the point M3 is a pivot point for the knife 19, 20.
  • connection between the knife 19, 20 and the projecting support 23 therefore allows the knife 19, 20 to make small movements in space, partly depending on the play deriving from the connection to the projecting support 23.
  • the two knives 19, 20 are opposite one another and the band 3 is inserted between the two knives 19, 20 as it slides along the processing line 6.
  • each knife 19, 20 has a profile with a central blade 27 designed to cut the band 3 and two lateral projections 28, positioned symmetrically relative to the central blade 27, for retaining the band 3 and the piece 12 produced by the cut.
  • the blades 19, 20 can move cyclically between a first, active cutting configuration, visible in Figure 4 , in which they are drawn near one another and a second, non-operating configuration, visible in Figure 2 , in which they are distanced from one another.
  • the two knives 19, 20 are fixed to the respective movable parts 21, 22 in such a way that the two planes P1 and P2 identified by the blades 27 of the respective knives 19, 20 are parallel.
  • the cutting station 18 forms cutting means 29 for the machine 1.
  • the machine 1 comprises a pair of accelerator rollers 30 designed to space the pieces 12 cut by the cutting station 18.
  • the machine 1 comprises a first and a second conveyor chain 31, 32, positioned parallel along the processing line 6 and set apart.
  • the chains 31, 32 are moved in a synchronised fashion by motor elements of the known type and not illustrated.
  • the band 3 preparation station 7 also comprises an optical detection element 15 which, according to the embodiment illustrated in the accompanying drawings, is a laser source and a control unit 17 interacting with the laser source and with the adjusting mechanism 14.
  • the calender 11, the calender 11 adjusting mechanism 14, the control unit and the optical detection element 15 form means 16 for correcting the curvature of the band 3.
  • control unit 17 In response to a change in the curvature of the band 3 detected by the detection element 15, the control unit 17 operates the calender 11 adjusting mechanism 14.
  • the two chains 31, 32 have a plurality of teeth 33, said teeth 33 positioned at the same distance from one another on both chains 31, 32.
  • the teeth 33 are designed to make contact with the rear part of the pieces 12, again with reference to the direction indicated by the arrow F in Figure 1 , and to transport the pieces 12 along the processing line 6 towards a rotation station 34.
  • the pieces 12 and the band 3 identify a plane P in which the band 3 and the pieces 12 lie.
  • the rotation station 34 also comprises magnetic supports 35 connected to a cam profile and designed to receive and retain the pieces 12 transported by the chains 31, 32.
  • the magnetic supports 35 comprise a rod 35a rotatably mounted on a plate 35b which moves cyclically along a path closed in a loop, consisting of a cam profile.
  • the path closed in a loop comprises an upper branch 36 along which the plates 35b are fed parallel with the processing line 6 according to the direction of the arrow F.
  • the rod 35a can rotate about a respective axis of rotation A substantially perpendicular to the plane P in which the pieces lie, illustrated in Figure 1 .
  • the rod 35a is rigidly connected to a yielding arm, not illustrated, which engages with the cam profile, also not illustrated, in that way causing the support 35 to rotate about its own axis A, when the plate 35b travels along the upper branch 36, and a translational motion along a predetermined path defined by the cam profile itself.
  • the rotation station 34 forms means 104 for transferring the pieces 12.
  • the magnetic supports 35 form means 37 for rotating the pieces 12.
  • the bending unit 38 comprises a first and a second movable element 39, 40 comprising two eccentric elements 41, each rotary.
  • the first movable element 39 is positioned above the pieces 12 and the second movable element 40 is positioned below the pieces 12.
  • the first movable element 39 supports a punch 42, whilst the second movable element 40 supports a die 43.
  • the punch 42 and the die 43 are shaped to match one another and can move between a position in which they are distanced from one another, in which they are not in contact, and a position in which they are close to one another, in which the punch 42 penetrates the die 43.
  • the punch 42 has a longitudinal extension parallel with the processing line 6 and has a length greater than the width of the band 3.
  • the die 43 consists of two lateral walls 43a and a base wall 43b, able to move relative to the two lateral walls 43a, as illustrated in Figure 7 .
  • the relative speed between the punch 42, the die 43 and the piece 12 is equal to zero.
  • the pieces 12 bent by the bending unit 38 form a set 44 of staples side by side along a predetermined direction.
  • the bending unit 38 forms means 45 for finishing the pieces 12 designed to bend the pieces 12 into a U shape.
  • the machine 1 comprises an extractor unit 46 positioned close to the bending unit 38 and designed to extract the sets 44 of staples from the bending unit 38.
  • the extractor unit 46 comprises a lower extractor 100, an upper extractor 101 and a lateral extractor 102.
  • the upper extractor 101 comprises a fixed bar 101a, parallel with the processing line 6 and positioned above it, close to the punch 42, as shown in Figure 7 .
  • the lower extractor 100 comprises the base wall 43b of the die 43 and is operated by two preloaded springs 100a, schematically illustrated in Figure 1 , designed to apply an elastic reaction force on the wall 43b which in turn pushes the set 44 of staples upwards to extract it from the die 43.
  • the springs 100a are an elastic element of the lower extractor 100.
  • the lateral extractor 102 comprises a plurality of teeth 102a able to move along a looped path 103 adjacent to the bending unit 38.
  • the teeth 102a are moved in such a way that they are synchronised with the punch 42 and are designed to make contact with the set 44 of staples, at its rear part, relative to the direction of feed along the line 6, when the set 44 has been formed and extracted, to move the set towards the conveyor unit 47.
  • the teeth are designed to engage with the rear part of each set 44 of staples.
  • a coupling station 49 Downstream of the conveyor unit 47 there is a coupling station 49, designed to temporarily couple the sets 44 of staples in pairs, to reduce the space occupied in the boxes.
  • the coupling station 49 comprises a rotary body 50, having a first and a second inner cavity 51, 52, an inlet 50a and an outlet 50b, as illustrated in Figure 1 .
  • the rotary body 50 preferably has a substantially cylindrical longitudinal extension along a direction parallel with the processing line and the two cavities 51, 52 extend inside it according to the same direction.
  • Each of the two cavities 51, 52 is made in such a way that it can house two sets 44 of staples bent into a U shape, positioned in such a way that they are interpenetrating with the respective concave parts opposite each other.
  • the two cavities 51, 52 are preferably parallelepipeds and their length is practically equal to the length of each set 44 of staples.
  • the two cavities 51, 52 are perpendicular to one another and have a respective central portion 53 coinciding in such a way as to form a single cavity having the shape of a Greek cross.
  • the coupling station 49 forms machine 1 coupling means 54.
  • the pair of rollers, the toothed chains, and the chain form machine feed means.
  • the band 3 reel 4 is drawn near the machine 1 and the starting end of the band 3 is inserted in the pair of rollers which begin rotating and pull the band 3 along the processing line 6 according to the direction of the arrow F in Figure 1 .
  • the first guillotine 8 is operated and cuts the starting end of the band 3, eliminating any finishing defect on the end and making it flat.
  • the band 3 is inserted between the two knives 19, 20 which, when they are in the position drawn near one another, apply respective cutting forces on the band 3, separating it into the above-mentioned pieces 12.
  • the fact that the knives 19, 20 are connected to the respective movable elements 21, 22 by the elastic elements 26 allows the knives 19, 20 to perform small oscillations in space, that is to say, to float.
  • each knife 19, 20 applies a uniform pressure on the entire band 3 making a precise cut along the entire width of the band 3.
  • the pieces 12 produced in the cutting station 18 then pass through the accelerator rollers 30 which space the pieces 12 and position them on the conveyor chains 31, 32.
  • the band 3 reaches the calender 11 which is automatically adjusted by detection of the curvature by the optical element 15.
  • the value detected is sent to the control unit, which operates the calender 11 adjusting mechanism 14 which, if the curvature of the band 3 increases, reduces the distance between the calender 11 rollers 13, thus increasing their effect.
  • the curvature of the band 3 is due to it being wound in the reel 4 and is greater the closer to the centre of the reel 4 the band 4 is.
  • said operation is performed completely automatically.
  • the rotation station 34 magnetic supports 35 rotate each piece 12 through 90° about the axis A and simultaneously move them towards the bending unit 38 thanks to their translation along the path defined by the cam profile.
  • each magnetic support continues its movement along the path, so that it returns to the position for picking up a new piece 12.
  • the pieces 12 are deposited at the bending unit 38 and, once rotated through 90°, have the metal wires 5 positioned perpendicular to the direction of feed indicated by the arrow F, as illustrated in Figures 1 and 3 .
  • the various pieces 12 pass between the punch 42 and the die 43 and are bent into a U shape, perpendicularly to the extension of the metal wires 5 of which each piece 12 consists, to form the above-mentioned sets 44 of metal staples 2.
  • the extractor unit 46 extracts the set 44 from the die 43 and punch 42, and carries it towards the coupling station 49.
  • the lower extractor 100 pushes it out of the die 43.
  • said springs 100a apply a thrusting action on the base wall 43b of the die 43, which can move relative to the lateral walls 43a of the die 43.
  • the fixed bar 101a makes contact with an upper portion of the set 44 of staples, removing it from the punch 42.
  • the lateral extractor 102 then, by means of the teeth 102a, moves the set 44 of staples towards the conveyor unit 47.
  • the sets 44 which come out of the bending unit 38 with the concave part facing upwards, slide towards the coupling station 49 which couples the sets 12 in pairs to reduce the space they occupy in the boxes.
  • the quality control laser 55 detects the dimensions of each set 44 of staples.
  • a pneumatic ejector pushes the set out of the processing line. Otherwise, the set 44 is inserted in the rotary body 50 in one of the two cavities 51, 52, depending on which at that moment is aligned with the set 44 of staples sliding on the processing line 6.
  • the rotary body 50 rotates through 180° moving the set 44 in the cavity 51, 52 so that the concave part is facing downwards and the cavity 51, 52 in which it is inserted is still aligned with the line 6 on which the sets of staples slide, so that the next set 44 arriving is inserted in it.
  • next set 44 of staples arrives, with the concave part facing upwards, it interpenetrates the set 44 of staples previously inserted in the same cavity 51, 52 and in this way the two sets 44 are coupled with the respective concave parts opposite one another.
  • the rotary body 50 rotates through 90° to move the empty cavity 51, 52 so that it is aligned with the line 6 on which the sets 44 of staples slide.
  • the invention brings important advantages.
  • the machine allows continuous production of the staples with a large number of sets of staples produced per hour.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Wire Processing (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Exchange Systems With Centralized Control (AREA)
  • Portable Nailing Machines And Staplers (AREA)

Claims (11)

  1. Machine à faire des agrafes de métal (2) à partir d'une bande (3), la bande (3) consistant en une pluralité de fils de métal (5) unis entre eux, comprenant :
    des moyens pour faire avancer la bande (3) le long d'une chaîne de transformation (6), dans une première direction parallèle aux fils de métal (5),
    des moyens (29) pour découper la bande (3) en une série de pièces (12) de longueur prédéterminée,
    des moyens de finition (45) conçus pour former un ensemble (44) d'agrafes (2) réunies, ayant une forme prédéterminée et comprenant un poinçon (42) et une matrice (43) se faisant face et en mouvement continu, réciproquement, au moins entre une première configuration active de pliage, dans laquelle ils se rapprochent, et une deuxième configuration non opérationnelle, dans laquelle ils s'éloignent ;
    des moyens (104) pour transférer les pièces (12) des moyens de découpage (29) aux moyens de finition (45),
    pour transporter les pièces vers les moyens de finition (45) ;
    la machine se caractérisant en ce que le poinçon (42) et la matrice (43) sont supportés respectivement par un premier élément mobile (39) et par un deuxième élément mobile (40) le long d'une trajectoire circulaire dont le mouvement, quand le poinçon (42) et la matrice (43) se trouvent dans la première configuration active de pliage, présente un composant parallèle à et dans la même direction que la direction d'avancement de la bande (3) le long de la chaîne de transformation (6).
  2. Machine selon la revendication 1, caractérisée en ce que les moyens de transfert (104) sont conçus pour transporter les pièces (12) des moyens de découpage (29) aux moyens de finition (45) le long d'une deuxième direction orthogonale aux fils de métal (5).
  3. Machine selon les revendications 1 ou 2, caractérisée en ce que les moyens de découpage (29) comprennent au moins un couteau (19, 20) et au moins un élément mobile respectif (21, 22) pour supporter et faire bouger le couteau (19, 20).
  4. Machine selon l'une quelconque des revendications 1 à 3, caractérisée en ce que les moyens de découpage (29) comprennent un premier couteau et un deuxième couteau (19, 20) se faisant face et supportés respectivement par un premier élément mobile et un deuxième élément mobile (21, 22), les couteaux (19, 20) se trouvant dans des plans respectifs (P1, P2) parallèles entre eux.
  5. Machine selon la revendication 4, caractérisée en ce que les couteaux (19, 20) peuvent bouger dans un mouvement continu, réciproquement, entre une première configuration active de découpage, dans laquelle ils se rapprochent et une deuxième configuration non opérationnelle, dans laquelle ils s'éloignent.
  6. Machine selon l'une quelconque des revendications 1 à 5, caractérisée en ce qu'elle comprend des moyens d'accouplement (54) pour les ensembles (44) d'agrafes, les moyens d'accouplement (54) étant conçus pour interpénétrer deux ensembles (44) d'agrafes pliées en U de sorte que les parties concaves des ensembles (44) se font face.
  7. Machine selon l'une quelconque des revendications 1 à 6, dans laquelle la chaîne de transformation (6) se développe selon une trajectoire pratiquement droite, caractérisée en ce que les moyens de transfert (104) comprennent des moyens de rotation (37) pour tourner les pièces (12).
  8. Machine selon l'une quelconque des revendications 1 à 7, dans laquelle il y a un poste (7) pour préparer la bande (3), caractérisée en ce que le poste de préparation (7) comprend des moyens (16) pour corriger la courbure de la bande (3).
  9. Machine selon l'une quelconque des revendications 1 à 8, caractérisée en ce qu'elle comprend une unité (46) pour extraire les agrafes (2) des moyens de finition (45), l'unité d'extraction (46) comprenant un extracteur inférieur (100), un extracteur supérieur (101) et un extracteur latéral (102).
  10. Machine selon la revendication 6, caractérisée en ce que les moyens d'accouplement (54) pour les ensembles (44) d'agrafes comprennent un corps pivotant (50) ayant au moins une cavité interne (51, 52) conçue pour loger au moins deux des ensembles (44) d'agrafes, le corps pivotant (50) se développant longitudinalement le long d'une direction (L) parallèle à la chaîne de transformation.
  11. Machine selon la revendication 7, caractérisée en ce que les moyens de rotation (37) comprennent une pluralité d'éléments magnétiques (35) pour retenir les ensembles (44) d'agrafes.
EP07789592A 2006-07-28 2007-07-25 Machine à faire des agrafes Not-in-force EP2064011B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT000573A ITBO20060573A1 (it) 2006-07-28 2006-07-28 Macchina per la produzione di punti.
PCT/IB2007/002207 WO2008012676A1 (fr) 2006-07-28 2007-07-25 Machine à faire des agrafes

Publications (2)

Publication Number Publication Date
EP2064011A1 EP2064011A1 (fr) 2009-06-03
EP2064011B1 true EP2064011B1 (fr) 2011-07-06

Family

ID=38658191

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07789592A Not-in-force EP2064011B1 (fr) 2006-07-28 2007-07-25 Machine à faire des agrafes

Country Status (4)

Country Link
EP (1) EP2064011B1 (fr)
AT (1) ATE515339T1 (fr)
IT (1) ITBO20060573A1 (fr)
WO (1) WO2008012676A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102259152B (zh) * 2011-02-22 2015-11-25 杭州华裕机械有限公司 C型钉制钉机
CN110227777A (zh) * 2019-06-20 2019-09-13 诸暨市斯博申机电设备设计有限公司 一种钉子生产设备

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE651843C (de) * 1933-06-09 1937-10-20 Karl A Kammer Verfahren zur Herstellung von zusammenhaengenden Streifen aus U-foermigen Heftklammern und aehnlichen Gegenstaenden aus Draht
FR983162A (fr) * 1949-03-15 1951-06-20 Procédé et machine pour la fabrication d'agrafes
DE959008C (de) * 1953-11-12 1957-02-28 Raimund Beck Vorrichtung fuer das Herstellen von Klammerstaeben
DE3529198A1 (de) * 1984-11-21 1986-05-28 Max Co. Ltd., Tokio/Tokyo Zusammenhaengende befestigungselemente sowie verfahren und vorrichtung zu deren herstellung
US5035040A (en) 1989-05-30 1991-07-30 Duo-Fast Corporation Hog ring fastener, tool and methods

Also Published As

Publication number Publication date
ATE515339T1 (de) 2011-07-15
WO2008012676A1 (fr) 2008-01-31
EP2064011A1 (fr) 2009-06-03
ITBO20060573A1 (it) 2008-01-29

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