FI92568C

FI92568C - Method and apparatus for making box blanks

Info

Publication number: FI92568C
Application number: FI891589A
Authority: FI
Inventors: Colin Stutt
Original assignee: Langston Machine
Priority date: 1986-10-04
Filing date: 1989-04-03
Publication date: 1994-12-12
Also published as: EP0326573B1; FI891589A0; WO1988002306A1; DE3786557T2; FI891589A; FI92568B; GB8623896D0; JPH02500828A; DE3786557D1; EP0326573A1

Description

9256892568

Menetelma ja laite laatikkoaihioiden valmistamiseksi -Method and apparatus for making box blanks -

Metod och anordning for att framstalla halvfabrikat for lådor 5 Tama keksintO koskee parannusta laitteeseen tai laitetta aaltopahvia olevien aihioiden kasittelemiseksi, joita kaytetaan laatikoiden, sailiOiden tai vastaavien valmis-tuksessa, ja erityisesti jatemateriaalin poistamista tai-laisten aihioiden maaritetyilta alueilta.The present invention relates to an improvement in an apparatus or apparatus for treating corrugated preforms used in the manufacture of boxes, containers or the like, and in particular to the removal of waste material or defined areas of such preforms.

1010

Tailaisten laatikoiden valmistamisen yhden vaiheen aikana aihiot taitetaan esimuodostettuja taittoviivoja pitkin ja aihioiden vastakkaiset paat kiinnitetaan yhteen limittain littean putken muodostamiseksi. Tamån epåkohtana on se, 15 etta kun osittain muodostetut laatikot pinotaan paailekkain on limittaisen alueen paksuus kaksinkertainen, minka vuoksi laatikot pinoutuvat epatasaisesti.During one step of making the boxed boxes, the blanks are folded along preformed fold lines and the opposite ends of the blanks are joined together to form an overlapping flat tube. The disadvantage of this is that when the partially formed boxes are stacked on top of each other, the thickness of the overlapping area is double, as a result of which the boxes are stacked unevenly.

Laatikkoaihioissa kaytetaan yleensa yksiaaltoista aaltopah-20 via, jossa yksi ainoa aallotettua ainetta oleva kerros si-joitetaan kahden pintakerroksen vaiiin, mutta suurenunissa laatikoissa voi pahvi olla viela paksumpaa, jolloin siina on kaksi tai jopa kolme aallotettua ainetta olevaa kerros-ta. Tailaisessa tapauksessa lisåpaksuus korostaa epatasais-25 ta pinoavuutta.In box blanks, a single corrugated corrugated board is generally used, in which a single layer of corrugated material is placed in the pile of two surface layers, but in enlarged boxes the cardboard may be even thicker, thereby having two or even three layers of corrugated material. In this case, the additional thickness emphasizes uneven stacking.

Kun pakattavat tuotteet sijoitetaan koottuun laatikkoon voivat ne lisaksi tarttua kiinni limittain olevien osien laatikon sisapuolelle muodostamaan kohoumaan. U.S.-patent-30 tijulkaisussa 1,186,087 on ehdotettu aaltopahvista valmis-tetun laatikon aikaansaamista, jossa aihion limittain olevat osat, jotka muodostavat liitoksen kun aihio taitetaan edelia esitetylia tavalla, leikataan pols niiden paksuuden pienentamiseksi.When the products to be packaged are placed in an assembled box, they can additionally stick to the protrusion formed by the overlapping parts on the inside of the box. U.S. Patent No. 1,186,087 proposes the provision of a box made of corrugated cardboard in which the overlapping portions of a blank that form a joint when the blank is folded as described above are cut into pols to reduce their thickness.

Taman keksinnOn eras toteutusmuoto koskee menetelmaa aaltopahvia olevien laatikkoaihioiden limittain olevien alu-eiden paksuuden pienentamiseksi, joka koostuu ainakin 35 2 92568 yhdestå aallotettua ainetta olevasta kerroksesta, joka on sijoitettu kahden pintakerroksen valiin, jolloin menetelmS kåsittaa aihioiden perSkkaisen syttttamisen, kunkin aihion pintakerroksen lapileikkaamisen maaritetyn alueen (so. osa 5 alueesta, joka tulee sijoittumaan limittain vastaavan alueen kanssa aihion vastakkaisella reunalla kun aihio kootaan laatikoksi) hahmottelemiseksi, ja taman jaikeen sanotun maaritetyn alueen yiapuolella olevan aallotetun aineen poisleikkaamisen paaasiassa koko sen paksuudesta 10 yhdessa leikatun pintakerroksen sen osan kanssa, joka ulottuu tåman alueen yli.One embodiment of the present invention relates to a method for reducing the thickness of overlapping areas of corrugated box blanks comprising at least 35 2 92568 of a layer of corrugated material interposed between two surface layers, the method comprising punching each of the blanks. i.e., a portion 5 of an area that will overlap with a corresponding region on the opposite edge of the blank when the blank is assembled into a box), and cutting off the corrugated material above said defined region substantially the entire thickness 10 along with the portion of the cut surface layer t over.

Taman keksinnOn eras toinen toteutusmuoto koskee laitetta aaltopahvia olevien laatikkoaihioiden limittain olevien 15 alueiden paksuuden pienentamiseksi, joka koostuu ainakin yhdesta aallotettua ainetta olevasta kerroksesta, joka on sijoitettu kahden pintakerroksen vaiiin, joka kdsittaa vM-lineen aihioiden perakkaiseksi siirtamiseksi leikkulait-teen ohi, joka kasittaa ensimmaisen leikkurin kunkin aihi-20 on pintakerroksen lapileikkaamiseksi maaritetyn alueen (so. osa alueesta, joka tulee sijoittumaan limittain vastaavan alueen kanssa aihion vastakkaisella reunalla kun aihio kootaan laatikoksi) hahmottelemiseksi, ja toisen leikkurin, joka on sovitettu leikkaamaan pois sanotun maaritetyn 25 alueen yiapuolella olevan aallotetun aineen paaasiassa sen koko paksuudesta yhdessa leikatun pintakerroksen sen osan kanssa, joka ulottuu taman alueen yli.Another embodiment of the present invention relates to an apparatus for reducing the thickness of overlapping areas of corrugated box blanks comprising at least one layer of corrugated material disposed on two surface layers of piles comprising a vM line for sequentially moving the blanks past the cutting device. each blank 20 is for outlining a defined area of the surface layer (i.e., a portion that will overlap with the corresponding area on the opposite edge of the blank when the blank is assembled into a box), and a second cutter adapted to cut off the undulating wave above said defined area; its entire thickness together with that part of the cut surface layer which extends over that area.

Keksinta selitetaan seuraavassa vain esimerkin avulla vii-30 taten oheiseen piirustukseen, jossa:The invention will now be described, by way of example only, with reference to the accompanying drawing, in which:

Kuv. 1 esittaa tasokuvaa laatikkoaihiosta, jossa on maari-tetyt alueet, joiden paksuutta on pienennetty, 35 Kuv. 2 esittaa leikkausta kuvion 1 viivaa II-II pitkin, 3 92568Fig. 1 shows a plan view of a box blank with defined areas whose thickness has been reduced; Fig. 2 shows a section along the line II-II in Fig. 1, 3 92568

Kuv. 3 esittaa kuviota 2 vastaavaa leikkausta aihiosta, mutta sen jålkeen kun aihio on taitettu litteåksi putkek-si, 5 Kuv. 4 esittaa kaaviomaisesti eråstå laitteen rakennemuo-toa sivulta katsottuna kuvion 1 aihion maaritettyjen alu-eiden paksuuden pienentamiseksi,Fig. 3 shows a section of the blank corresponding to Fig. 2, but after the blank has been folded into a flat tube, Fig. 4 schematically shows a side view of a device for reducing the thickness of the defined areas of the blank of Fig. 1,

Kuv. 5 esittaa osaa kuviosta 4 paalta katsottuna, 10Fig. 5 shows a part of Fig. 4 seen from the top, Fig. 10

Kuv. 6 esittaa leikkausta kuvion 5 viivaa VI-VI pitkin suuremmassa mittakaavassa,Fig. 6 shows a section along the line VI-VI in Fig. 5 on a larger scale,

Kuv. 7 esittaa leikkausta kuvion 5 viivaa VII-VII pitkin 15 suuremmassa mittakaavassa,Fig. 7 shows a section along the line VII-VII in Fig. 5 on a larger scale,

Kuv. 8 esittaa leikkausta kuvion 4 laitteen muunnetusta rakennemuodosta, ja 20 Kuv. 9 esittaa kaaviomaisesti kuvion 4 laitteen erasta toista muunnettua rakennemuotoa.Fig. 8 shows a section of a modified embodiment of the device of Fig. 4, and Fig. 9 schematically shows another modified embodiment of a device of Fig. 4.

Viitaten piirustuksen kuvioihin 1-3 on 2 laatikkoaihio, joka on valmistettu yksiaaltoisesta aaltopahvista, joka 25 kasittaa yhden ainoan aallotettua ainetta olevan kerroksen *: C, joka on sijoitettu kahden tasaisen pintakerroksen LI, L2 vaiiin. Aihiossa on samansuuntaiset taivutusviivat 4 ja 6, jotka ulottuvat aihion reunojen 8 ja 10 vaiilta; vastak-kaiset poikittaisista raoista 12, 14 ja 16 muodostuvat 30 parit ulottuvat taivutusviivojen ja aihion reunojen 18, 20 vaiilta; ja taivutusviivat 22, 24 ja 26, jotka ovat samal-la viivalla rakojen 12, 14 vast. 16 kanssa ulottuvat nai-den vaiilta. Kaistaleet 28 ja 30 ulottuvat reunoista 8 vast. 10, jolloin kaistaleiden paksuutta on pienennetty 35 niiden koko pinta-alalta aihion vastakkaisilta puolilta, kuten kuviossa 2 on esitetty, aihion kummastakin paasta. Taman jaikeen aihio taitetaan tunnetulla tavalla taivutus- 1“ 4 92568 viivoja 22 ja 26 pitkin aihion muotoilemiseksi litteSksi putkeksi niin, etta kaistaleiden 8 ja 10 jaannOsosat si-joittuvat limittain ja kiinnitetaan aihion vastakkaisiin paihin, kuten kuviossa 3 on esitetty.Referring to Figures 1-3 of the drawing, there are 2 box blanks made of single corrugated corrugated cardboard covering a single layer of corrugated material *: C disposed in the piles of two flat surface layers L1, L2. The blank has parallel bending lines 4 and 6 extending from the grooves at the edges 8 and 10 of the blank; opposite pairs of transverse slits 12, 14 and 16 extending from the grooves of the bend lines and the edges 18, 20 of the blank; and bending lines 22, 24 and 26, which are on the same line as the slots 12, 14, respectively. 16 extending from the women's footsteps. Strips 28 and 30 extend from edges 8 and 2, respectively. 10, wherein the thickness of the strips has been reduced 35 over their entire surface area on opposite sides of the blank, as shown in Figure 2, from each pass of the blank. The blank of this piece is folded in a known manner along bending lines 22 and 26 to form a blank into a flat tube so that the dividing portions of the strips 8 and 10 are placed in an overlapping manner and fastened at opposite points of the blank, as shown in Fig. 3.

55

Tassa yhteydessa viitataan myOs piirustuksen kuvioihin 4-7. Laatikkoaihioita syOtetaan kuvion 4 nuolen suuntaan minka tahansa tyyppisesta paino- ja pistokoneesta (ei esitetty) yksi kerrallaan ja valimatkan paassa toisistaan syOttO-10 suunnassa. Aihot ovat kuten edelia on esitetty silia erol-la, etta kaistaleiden 8 ja 10 paksuutta ei viela tassa vaiheessa ole pienennetty ja ovat siis sellaisia, kuten ne on esitetty pistekatkoviivoin B kuviossa 2. Kukin aihio syOtetaan lappeellaan pintakerros LI ylOspain ja reuna 18 15 suunnattuna eteenpain kahta hihnaparia kohti, jotka si- jaitsevat valimatkan paassa toisistaan aihion leveydelta niin, etta reunat 8 ja 10 ulottuvat hihnojen yli. Kukin hihnapari koostuu yia- ja alahihnasta 32 vast. 34, joiden vierekkaisten silmukoiden vaiiin aihio tarttuu kiinni, 20 jonka jalkeen se syOtetaan syOttOrataa pitkin, joka on maaritetty hihnojen vierekkaisten silmukoiden avulla, jolloin hihnat ulottuvat hihnapyOrien 36, 38 valilta (kuv.In this connection, reference is made to Figures 4-7 of the myOs drawing. The box blanks are fed into the direction of the arrow in Figure 4 any given type and weight of the stitch machine (not shown), one at a time and spaced apart in the feed direction 10. The blanks are as shown above with Silia Erol, that the thickness of the strips 8 and 10 has not yet been reduced at this stage and are therefore as shown by the dotted lines B in Fig. 2. Each blank is fed with its flap surface layer LI upwards and edge 18 facing forwards. towards two pairs of belts spaced apart from the width of the blank so that edges 8 and 10 extend over the belts. Each pair of belts consists of a yia and a lower belt 32 resp. 34, the adjacent loops of which adhere to the blank, 20 after which it is fed along a feed path defined by adjacent loops of belts, the belts extending between the belt pulleys 36, 38 (FIG.

4).4).

25 Samalla kun hihnat 32, 34 syOttavat aihiota pienennetaan '· kaistaleiden 28, 30 paksuutta niiden koko pinta-alalta leikkaamalla pois toinen pintakerroksista LI, L2 ja kerros C paaasiassa kokonaisuudessaan vastaavien leikkuuyksikOiden avulla, jotka on yleisesti esitetty kohdissa 40 ja 42. 30 Koska yksikOt 40, 42 ovat hyvin samantapaisia tullaan seuraavassa selityksessa samoja viitenumeroita kéyttamaan ·· samoja osia vårten kummassakin yksikOssa mutta yksikOn 42 osien kohdalla viitenumeroita, joihin on lisatty 100.While the belts 32, 34 are fed to the blank, the thickness of the strips 28, 30 is reduced over their entire surface area by cutting off one of the surface layers L1, L2 and layer C entirely by means of the respective cutting units generally shown at 40 and 42. 40, 42 are very similar, in the following description the same reference numerals will be used for the same parts in both units, but for the parts of unit 42 reference numbers with the addition of 100 will be used.

35 Kukin yksikkO 40, 42 kasittaa ensimmdisen ympyrSnmuotoisen leikkurin 44, 144, joka on kiinnitetty akseliin 46, 146, ja 5 92568 alavirtaan siitå toisen ympyranmuotoisen leikkurin 48, 148, joka on kiinnitetty akseliin 50, 150.Each unit 40, 42 feeds a first circular cutter 44, 144 attached to the shaft 46, 146, and 5 92568 downstream of a second circular cutter 48, 148 attached to the shaft 50, 150.

Akseleita 46, 50 ja 146, 150 kaytetaan hihnojen 52, 54 5 vast. 152, 154 kautta moottoreiden 56 vast. 156 avulla niin, etta leikkureiden 44, 144, 48, 148 kehanopeus on 10-12 kertaa suurempi kuin se nopeus, jolla aihioita syOte-taan hihnojen 32, 34 avulla, jolloin kaikki leikkurit pydrivat vaakatasossa. Kuviossa 4 katsottuna leikkurit 44, 10 48 pyOrivat vastapaivaan, ja leikkurit 144, 148 mydtapai- vaan. Akselit 46, 50 ovat asennetut siten, etta leikkurit 44, 48 sijoittuvat aihioiden syiittOradan alapuolelle ja akselit 146, 150 ovat asennetut siten, etta leikkurit 144, 148 sijoittuvat syOttOradan yiapuolelle. Kukin leikkuri on 15 varustettu usealla leikkuuteraiia 58 jyrsimen tavoin. Kunkin leikkurin 44, 48 yiapuolelle on sijoitettu imulaa-tikko 60 vast. 61, jotka pohjapinnastaan ovat varustetut raoilla 62, 63 (katso kuvioita 6 ja 7) ja joihin kohdiste-taan imu putkien 64, 65 kautta. Kunkin leikkurin 144, 148 20 alapuolelle on vastaavalla tavalla sijoitettu imulaatikko 90 vast. 92, joiden kansipinnassa on raot 94, 96, joihin kohdistetaan imu putkien 98, 100 kautta. Kiintea levy 66 on sijoitettu kuvioissa 4, 5 esitetylia tavalla aihion tukemi-seksi lahelta sen reunaa 8, ja toinen kiintea levy 68 tukee 25 aihion reunaa 10.Shafts 46, 50 and 146, 150 are driven by belts 52, 54 5, respectively. 152, 154 via motors 56 resp. 156 so that the circumferential speed of the cutters 44, 144, 48, 148 is 10-12 times higher than the speed at which the blanks are fed by the belts 32, 34, whereby all the cutters rotate horizontally. Viewed in Figure 4, the cutters 44, 10 48 rotate counterclockwise, and the cutters 144, 148 rotate to the myda. The shafts 46, 50 are mounted so that the cutters 44, 48 are located below the feed path of the blanks and the shafts 146, 150 are mounted so that the cutters 144, 148 are located above the feed path. Each cutter is provided with a plurality of cutting blades 58 similar to a cutter. On the other side of each cutter 44, 48 is a suction box 60 respectively. 61, which at their bottom surface are provided with slits 62, 63 (see Figures 6 and 7) and to which suction is applied through pipes 64, 65. Below each cutter 144, 148 20 there is a correspondingly placed suction box 90 resp. 92 having slits 94, 96 in the lid surface to which suction is applied through tubes 98, 100. The rigid plate 66 is positioned as shown in Figures 4, 5 to support the blank 8 close to its edge 8, and the second rigid plate 68 supports the edge 10 of the blank.

Seuraavassa esitetaan laitteen toimintatapa seuraamalla yhden aihion kulkua laitteen lapi. Sen jaikeen kun sita on kasitelty painamalla ja pistamaiia aihio sydtetaan leikku-30 reita 44, 144 kohti. Viimeksimainitut on sijoitettu niin, etta kun ne tulevat kosketukseen vastaavien kaistaleiden • 28, 30 kanssa ne suorittavat taman samalla viivalla aihion reunojen 8, 10 kanssa. Juuri ennenkuin kaistale 8 tulee kosketukseen leikkurin 44 kanssa kaytetaan raon 62 kautta 35 vaikuttavaa imua kaistaleen pitamiseksi tasaisena sen ohit-taessa leikkurin. Kun leikkuri tulee kosketukseen kaistaleen 28 etureunan kanssa se aloittaa leikkaamisen alapinta- 92568 --- - τ-- 6 kerroksen L2 ja myiJs aallotetun kerroksen C lSpi mutta jattaa yiapintakerroksen LI leikkaamatta, kuten kuviossa 6 on esitetty. Kun hihnat 32, 34 jatkavat aihion sydttamista leikkuri 44 suorittaa kapean viillon 70 (leikkuri vol 5 esimerkiksi olla 3 nun levea) aihiota pitkin kaistaleen 28 kantaosasta samalla viivalla reunan 8 kanssa. Kun kaistaleen 28 takareuna Irtoaa kosketuksesta leikkurin 44 kanssa on se alue kaistaleesta 28, jonka paksuutta halutaan pie-nentaa, hahmotettu aihion muusta osasta kapean viillon 70 10 avulla. Myds kaistale 28 siirtyy poispain imulaatikosta 60.The following shows the operation of the device by following the passage of one blank through the device. Its jaike when it is processed by pressing and stitching the blank is carded into the cut-30 towards the thighs 44, 144. The latter are arranged so that when they come into contact with the respective strips • 28, 30 they perform this in the same line with the edges 8, 10 of the blank. Just before the strip 8 comes into contact with the cutter 44, effective suction is applied through the slot 62 to keep the strip flat as it passes the cutter. When the cutter comes into contact with the leading edge of the strip 28, it starts cutting the lower surface layer L2 and sells the corrugated layer C1Spi but leaves the surface layer L1 without cutting, as shown in Fig. 6. As the belts 32, 34 continue to feed the blank, the cutter 44 makes a narrow incision 70 (for example, the cutter 5 may be 3 nun wide) along the blank from the base of the strip 28 on the same line as the edge 8. When the trailing edge of the strip 28 disengages from contact with the cutter 44, the area of the strip 28 whose thickness is to be reduced is outlined from the rest of the blank by means of a narrow incision 70. The myds strip 28 moves away from the suction box 60.

Samanaikaisesti viillon 70 muodostamisen yhteydessa leikkuri 144 muodostaa vastaavan viillon 72 kaistaleen 30 kannan kohdalle, samalle viivalle aihion reunan 10 kanssa. Koska 15 leikkuri 144 kuitenkin tassa tapauksessa sijaitsee aihion yiapuolella se leikkaa yiapintakerroksen LI ja myds aallotetun kerroksen C lapi mutta jattaa alapintakerroksen L2 leikkaamatta. Se osa kaistaleesta 30, jonka paksuutta on tarkoitus pienentaa, on siis hahmotettu aihion muusta 20 osasta viillon 72 avulla. Samanaikaisesti kun tata viiltoa tehdSSn pidetaan kaistaletta 30 tasaisena imulaatikon 90 kohdistaman imun avulla.Simultaneously with forming the incision 70, the cutter 144 forms a corresponding incision 72 at the base of the strip 30, in line with the edge 10 of the blank. However, since the cutter 144 in this case is located on the yia side of the blank, it intersects the y1 surface layer L1 and myds the corrugated layer C but leaves the lower surface layer L2 uncut. The part of the strip 30 whose thickness is to be reduced is thus outlined from the rest of the blank 20 by means of an incision 72. At the same time as making this incision, the strip 30 is kept flat by the suction applied by the suction box 90.

Kun hihnat 32, 34 jatkavat aihion sydttamista tulee kais-25 tele 28 yhteyteen leikkurin 48 kanssa, joka vShitellen '· poistaa pintakerroksen L2 ja aallotetun kerroksen C jaan- ndsosat siita kaisteleesta. Tåmån toimenpiteen aikana kaistaletta 28 pidetaan tasaisena laatikon 61 pohjaa vas-taan raon 63 kautta kohdistetun imun avulla. Leikkuri 148 30 poistaa samanaikaisesti pintakerroksen LI ja aallotetun kerroksen C jaanndsosat kaistaleesta 30, jolloin kaistaletta pidetaan tasaisena imulaatikon 92 kohdistaman imun avulla. Kun kaistaleet 28, 30 siirtyvSt pois yhteydesta vastaavien leikkureiden 48, 148 kanssa tulevat kaistaleet 35 siis kasittamaan vain pintakerroksen LI vast. L2.As the belts 32, 34 continue to feed the blank, the strip-25 will come into contact with the cutter 48, which will remove the surface layer L2 and the remaining portions of the corrugated layer C from that strip. During this operation, the strip 28 is kept flat by suction directed against the bottom of the box 61 through the slot 63. The cutter 148 30 simultaneously removes the portions of the surface layer L1 and the corrugated layer C from the strip 30, keeping the strip flat by the suction applied by the suction box 92. Thus, when the strips 28, 30 move out of contact with the respective cutters 48, 148, the strips 35 only cover the surface layer L1, respectively. L2.

7 925687 92568

Leikkureiden 44, 48 poistama JStemateriaali ohjataan oh-jauslevyjen 74 (kuv. 4) avulla niin, etta se putoaa kauka-loon 76 ja poistetaan. Tata tarkoitusta vårten kaukalo 76 vol olla tarytetty, tai se voi muodostaa osan minka tahan-5 sa tyyppisesta sopivasta ilmakuljettimesta. Samantyyppista kaukaloa (ei esitetty) kaytetaan lelkkurien 144, 148 pois-taman jatemateriaalin kokoamlseksl. JStemateriaali voidaan vaihtoehtoisesti poistaa imuputkien (ei esitetty) avulla, jotka on sijoitettu leikkureiden laheisyyteen, kuten hyvin 10 tunnetaan laatikonvalmistusteollisuudessa.The JStem material removed by the cutters 44, 48 is guided by the guide plates 74 (Fig. 4) so that it falls into the remote 76 and is removed. For this purpose, the trough 76 vol may be provided, or it may form part of a suitable air conveyor of any type. A tray of the same type (not shown) is used to assemble the extension material removed by the sliders 144, 148. Alternatively, the JSt material can be removed by means of suction tubes (not shown) located in the vicinity of the cutters, as is well known in the box manufacturing industry.

Sen jaikeen kun aihio on siirtynyt pois leikkureista 48, 148 se syOtetaan toiseen laitteeseen (ei esitetty), joka muotoilee aihion litteSksi putkeksi, kuten edelia on esi-15 tetty.Once the blank has moved out of the cutters 48, 148, it is fed to another device (not shown) which forms the blank into a flat tube, as described above.

Kuviossa 8 esitetyssa muunnelmassa leikkuri 144 on korvat-tu kiekkoteraiia 77, joka on kiinnitetty akseliin 146, ja leikkuri 148 on korvattu kiekkoteraiia 78, joka on kiinni-20 tetty akseliin 80, joka on asennettu kohtisuoraan akselia 146 vastaan niin, etta tera 78 pydrii vaakatasossa. Tassa tapauksessa tera 77 muodostaa viillon samaan kohtaan kuin edelia esitetty kapea viilto 72, ja tera 78 leikkaa kaista-leen 30 muodostavan aallotetun kerroksen C lapi pintaker-25 roksen L2 suuntaisesti ja mahdollisimman låhelta tata ’· kerrosta sita vahingoittamatta. Tera 78 tydntyy teran 77 muodostamaan viiltoon niin, etta kun kaistale 30 siirtyy pois yhteydesta teran 78 kanssa jatemateriaali poistetaan yhtenS kappaleena milla tahansa sopivalla tavalla. Tera 78 30 voidaan vaihtoehtoisesti korvata jyrsinleikkurilla, joka vastaa leikkuria 148, mutta joka on asennettu samalla tavalla kuin tera 78. On tietenkin ilmeista, etta sama muunnelma on mahdollinen leikkurin 48 osalta.In the variation shown in Figure 8, the cutter 144 is replaced by a disc blade 77 attached to the shaft 146, and the cutter 148 is replaced by a disc blade 78 attached to a shaft 80 mounted perpendicular to the shaft 146 so that the blade 78 rotates horizontally. . In this case, the blade 77 forms an incision at the same point as the narrow incision 72 shown above, and the blade 78 cuts the corrugated layer C forming the strip 30 parallel to the surface layer L2 and as close as possible to the layer without damaging it. The blade 78 fills into the incision formed by the blade 77 so that when the strip 30 moves out of contact with the blade 78, the extension material is removed in one piece in any suitable manner. Alternatively, the blade 78 30 may be replaced by a cutter cutter corresponding to the cutter 148, but mounted in the same manner as the blade 78. It is, of course, apparent that the same variation is possible for the cutter 48.

35 Eraassa toisessa, kuviossa 9 esitetyssa muunnelmassa jatemateriaali poistetaan kaistaleesta 30 leikkuuyksikdn 82 avulla, joka kasittaa teraa 77 vastaavan kiekkoterSn 84, ja 8 92568 ympyrarunuo toisen, jyrkinleikkuria 148 vastaavan leikkurin 86. Terå 84 ja leikkuri 86 ovat asennetut yhteiselle akselille (ei esitetty) niin, ettS kun hihnat 32, 34 sydttavat aihiota ter& 84 muodostaa viillon kaistaleen 30 kantaa 5 pitkin siita poistettavan materiaalin hahmottelemiseksi, ja leikkuri 86 samanaikaisesti poistaa taman jatemateraalin. Samantyyppista leikkuuyksikkda tullaan tietenkin my6s kSyt-tamaan jatemateriaalin poistamiseksi kaistaleesta 28.In another variation, shown in Figure 9, the debris material is removed from the strip 30 by a cutting unit 82 which feeds a disc blade 84 corresponding to the blade 77 and a circular groove 86 corresponding to the sharp cutter 148. The blade 84 and cutter 86 are mounted on a common shaft (not shown). that when the belts 32, 34 feed the blank ter & 84 form an incision along the base 5 of the strip 30 to outline the material to be removed therefrom, and the cutter 86 simultaneously removes this extension material. Of course, a cutting unit of the same type will also be used to remove debris from strip 28.

10 On ilmeista, etta kiekkoteraa, kuten teraa 84, voitaisiin kayttaa kuvion 4 kunkin leikkurin 44, 144 sijasta.It will be appreciated that a disc blade, such as blade 84, could be used in place of each cutter 44, 144 in Figure 4.

Seuraavassa patenttivaatimuksissa viitenumeroihin viita-taan vain esimerkin vuoksi eika niiden tarkoituksena ole 15 rajoittaa patenttivaatimuksien puitteita.In the following claims, reference numerals are referred to by way of example only and are not intended to limit the scope of the claims.

Claims

A method of making box blanks (2) from corrugated cardboard, wherein the blanks of corrugated board are fed along 5 successive cutting paths in the direction of opposite edges (8, 10) of the blank (2) to be placed overlapping and joined together to form a flat tube before being shaped into a box. that said opposite edge regions (8, 10) of the blank are reduced in thickness from the regions (28.30) from which they are located in an overlapping manner by means of a cutting device (44.48; 144.148; 77.78; 84.86) which is located in the Gulf of Südtrad.

A method according to claim 1, characterized in that the reduction of the thickness of the edge region of each blank (2) is achieved by cutting the surface layer (L1, L2) of the blank to outline the defined area (B) and cutting off this jaw by said defined style. the corrugated material (C) in the region mainly along its entire thickness together with the part of the cut surface layer (L1, L2) above this region.

A method according to claim 2, characterized in that the second cutting operation is performed by means of a milling tool (48, 148).

A method according to claim 3, characterized in that the first cutting operation for outlining the defined area 30 is performed by means of a milling tool (44, 144) which is narrower than the milling tool (48, 148) performing the second cutting operation to form a narrow groove in the cardboard.

A method according to claim 2, characterized in that at least the first cutting operation is performed by means of a disc blade (77,84). 10 92568

6. For producing box blanks from corrugated cardboard consisting of a corrugated material placed in a two-surface layer, the device stacking means (32, 34) for feeding the blanks in the direction of the opposite edges (8, 10) of the blank (2). to be overlapped and joined together to form a flat tube before shaping the box, characterized by a cutting device (44, 48; 144, 148; 77, 78; 84, 86) adapted to act on parts of the blank along said opposite edges of the blank as the blank moves past the cutting device to cut off portions of the respective surface layers and corrugated material from those areas of each blank which are intended to overlap.

Device according to claim 6, characterized in that the cutting device for each edge has a first cutter (44; 144; 77; 84) for cutting the surface layer of each blank to outline a defined area, and a second cutter (48; 148; 78; 86), adapted to cut off said corrugated material in said defined area substantially along its entire thickness together with a portion of the cut surface layer extending beyond said area.

Device according to Claim 7, characterized in that the second cutter feeds the milling cutter (48; 148).

Device according to claim 8, characterized in that the first cutter feeds a milling cutter (44; 30 144) which is narrower than the second cutter for cutting a narrow groove in the cardboard.

9 92568

Device according to Claim 7, characterized in that at least the first cutter (77; 84) feeds the disc blade. 11 92568

Device according to one of Claims 6 to 10, characterized in that it has at least one box member (60; 61; 90, 92) for supporting the blank during cutting and having at least one slot (62; 63; 94; 5 96), through which the suction prevailing in the box is directed to keep the blank in contact with the box. claim; 10