DK172359B1

DK172359B1 - Rotating cutter unit for hedge cutter

Info

Publication number: DK172359B1
Application number: DK43396A
Authority: DK
Inventors: Finn Mortensen
Original assignee: Kyndestoft Maskinfabrik Aps
Priority date: 1996-04-15
Filing date: 1996-04-15
Publication date: 1998-04-14
Also published as: DK43396A

Description

1 DK 172359 B11 DK 172359 B1

Opfindelsen angår et roterende skæreaggregat til en hegnsklipper af den art, som især benyttes til beskæring af levende hegn (markhegn) og lignende rækkekulturer, hvor beskæringen udføres med et hurtigt roterende skæreaggregat i form af en cirkulær metalskive med en fortanding, som udgøres af en udskiftelig, eventuelt standardtype kædesavskæde, der er monteret langs skivens periferi med 5 radiært udadvendende savtænder.BACKGROUND OF THE INVENTION The invention relates to a rotary cutting unit for a fence mower of the kind used especially for pruning live fences (field fences) and similar row crops, where the pruning is carried out with a fast rotating cutting unit in the form of a circular metal disc with a tooth which is interchangeable , optionally standard type chain saw chain mounted along the periphery of the disc with 5 radially outward saws.

Hegnsklipperen er fortrinsvis af den type, som består af et traktormonteret redskab med en hydraulisk manøvrerbar arm med skæreaggregatet anbragt i armens frie ende, således at skæreaggregatets højde og sidestilling kan reguleres under driften, idet beskæringen foretages 10 medens traktoren kører med passende lav hastighed langs hegnet.The hedge mower is preferably of the type consisting of a tractor-mounted implement with a hydraulically maneuverable arm with the cutting unit disposed at the free end of the arm, so that the height and lateral position of the cutting unit can be controlled during operation, with the trimming being carried out while the tractor is running at a suitable low speed along the fence. .

Hegnsklippere af den omhandlede art er sædvanligvis udstyret med et skæreaggregat af slagletypen.Fence mowers of the type in question are usually equipped with a stroke type cutting unit.

Et slagleskæreaggregat består af en stålskive, som er forsynet med et antal svingbart lejrede, knivformede slagler langs periferien. Under rotationen holdes slaglerne i arbejdsstilling af 15 centrifugalkraften, og den beskærende / klippende effekt forårsages især af slaglernes dynamiske slagvirkning på grenene. En egentlig savende effekt er der nærmest ikke tale om. Virkningen forudsætter følgelig en relativ høj rotationshastighed af slagleskiven, sædvanligvis af størrelsesordenen 1500 - 2500 omdr/min, og da der er tale om en relativ stor skive (diameter af størrelsesordenen 1100 mm) er denne rotationshastighed ikke uden risiko for omgivelserne.A impact cutting assembly consists of a steel disc which is provided with a plurality of pivotally mounted, knife-shaped impactors along the periphery. During rotation, the pulleys are kept in working position by the centrifugal force, and the pruning / cutting effect is mainly caused by the dynamic impact of the pulleys on the branches. There is hardly any actual sawing effect. Accordingly, the effect requires a relatively high rotational speed of the impact disc, usually of the order of 1500 - 2500 rpm, and since this is a relatively large disc (diameter of the order of 1100 mm), this rotational speed is not without risk to the environment.

2020

Som alternativ til slagleskiven har man forsøgt at anvende en traditionel rundsavklinge enten af HHS-typen eller af typen med påloddede hårdmetaltænder. Fordelen ved en rundsavklinge i forhold til en slagleskive er, at rundsavklingen kan fungere med god skæreeffekt selv ved en væsentlig lavere rotationshastighed end slagleskiven, idet rundsavklingen virker ved skærende bearbejdning i 25 modsætning til slagleskivens hovedsagelige dynamiske effekt. Rundsavklinger af HHS-typen har imidlertid en til formålet helt utilstrækkelig standtid, dvs at tænderne ofte skal slibes eller files, medens hårdmetal-typen i den dimension, som der her er tale om, har en overordentlig høj anskaffelsespris. Rundsavklinger af disse traditionelle typer har derfor ikke vundet større udbredelse til hegnsklippere og lignende træskæremaskiner, hvor der stilles extreme krav til materiellets 30 holdbarhed og slidstyrke.As an alternative to the impact disc, an attempt has been made to use a traditional circular blade either of the HHS type or of the type with soldered cemented carbide teeth. The advantage of a circular blade over a paddle disc is that the circular blade can operate with good cutting power even at a substantially lower rotational speed than the paddle disc, the circular blade acting by cutting machining in contrast to the main dynamic power of the paddle disc. However, circular saws of the HHS type have a completely inadequate life for the purpose, ie the teeth often have to be grinded or file, while the cemented carbide type in the dimension in question has an extremely high cost. Therefore, circular saws of these traditional types have not been widely used for fence mowers and similar wood cutting machines, where extreme demands are made on the durability and durability of the material.

Ved i stedet for en traditionel rundsavklinge at benytte en cirkulær metalskive, hvis fortanding udgøres af en udskiftelig kædesavskæde, som er monteret langs skivens periferi med radiært udadvendende savskær, opnår man dels en relativ prisbillig løsning, dels mulighed for hurtigt at 35 kunne udskifte kædesavskæden, når tænderne er slidt. Et skæreaggregat af denne type kendes bl a fra beskrivelsen til US-patent nr 2.958.348 og fra EP offentliggørelsesskrift nr 377.421 .1 begge tilfælde er kædesavskæden indlagt i en ringformet not langs skivens periferi for at skabe et sikkert anlæg for savkædens kædeled mod skivens perifere flade, samtidig med at kædens radiært indadvendende ledtappe, som er optaget i noten, styrer savkæden sideværts. I US-patentskrift nr 40 2.958.348 angives det, at savkæden kan forankres til metalskiven ved indføring af tværtappe gennem passende tværboringer i skiven og savkædens medbringertappe. Dette kædeforankringsprincip er imidlertid uegnet i praksis, idet kæden strækkes efterhånden som den slides. Efter nogen tids brug vil kæden sidde løs på skiven, og systemet giver ingen mulighed for opstramning af kæden.Instead of using a conventional circular saw blade, a circular metal disc, the tooth of which consists of an interchangeable chain saw chain mounted along the periphery of the disc with radially outward cutting saw, obtains a relatively inexpensive solution and the possibility to quickly replace the chain saw, when the teeth are worn. A cutting assembly of this type is known, inter alia, from the specification of US Patent No. 2,958,348 and from EP Publication No. 377,421 .1 In both cases, the chain saw chain is inserted into an annular groove along the circumference of the disc to create a secure abutment for the chain link chain against the periphery of the disc. flat, while the chain's radially inward link pin included in the groove guides the saw chain laterally. U.S. Pat. No. 2,958,348 states that the saw chain can be anchored to the metal disc by inserting cross pins through appropriate cross bores in the disc and the saw chain carrier pins. However, this chain anchoring principle is unsuitable in practice as the chain is stretched as it wears. After some time of use, the chain will become loose on the disc and the system will not allow for tightening of the chain.

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i 2 DK 172359 B1 «i 2 DK 172359 B1 «

Med det formål at afhjælpe denne ulempe foreslås det ifølge opfindelsen at forankre savkæden til skiven således som angivet i den kendetegnende del af krav l. Det ejendommelige ved opfindelsen består i, at kæden i den ene ende er løsgørligt forankret til skiven ved indgreb i en til konturen af et enkelt kædeled svarende udsparing (udfræsning eller udstansning) i skiven, hvilken udsparing 5 befinder sig umiddelbart indenfor skiveperiferien, og at kæden fra dette ankerpunkt fortsætter over i den cirkulære bane langs skivens periferi indtil et andet, modsatliggende ankerpunkt, hvilket udgøres af en stagboltlignende strammeskrue, der forbinder kædens sidste led i den pågældende ende med et ankerpunkt i selve skiven, hvilket ankerpunkt kan bestå af en tværtap indsat i skiven eller et lignende fast holdepunkt for skruen.In order to alleviate this disadvantage, it is proposed in accordance with the invention to anchor the saw chain to the disc as set forth in the characterizing part of claim 1. The peculiarity of the invention consists in that the chain is detachably anchored to the disc at one end by engagement with a disc. the contour of a single chain link corresponding recess (milling or punching) in the disc, which recess 5 is immediately within the disc periphery, and that the chain from this anchor point continues into the circular path along the periphery of the disc until another opposite anchor point is constituted by a a stud bolt-like tightening screw connecting the last link of the chain at that end to an anchor point in the disc itself, which anchor point may consist of a transverse pin inserted in the disc or a similar fixed holding point of the screw.

10 1 denne form udmærker kædeforankringen sig ved dels at tillade en trinløs opstramning af kæden efterhånden som den bliver slidt (eller strakt), dels at muliggøre en meget hurtig og problemfri udskiftning af kæden. Strammeskruen kan fordel være indrettet til opstramning af kæden under brugen v hj af en skruenøgle eller et andet simpelt værktøj. Derved kan det på enkel vis sikres, at 15 kæden altid holdes stramt fastspændt på stålskiven under brugen.In this form, the chain anchorage is distinguished by allowing a stepless tightening of the chain as it becomes worn (or stretched) and partly by allowing a very quick and trouble-free replacement of the chain. Advantageously, the tightening screw can be adapted to tighten the chain during use of a wrench or other simple tool. In this way, it can be easily ensured that the chain is always held tightly on the steel disc during use.

Opfindelsen skal forklares nærmere i forbindelse med tegningen, hvor fig. 1 viser et skæreaggregat (savklinge) ifølge opfindelsen, set fra siden, 20 fig. 2 samme i tværsnit, og fig. 3 en forstørret detalje ved savklingen, der viser kædesavskædens fastspænding eller forankring til stålskiven.The invention will be explained in more detail in connection with the drawing, in which fig. 1 is a side view of a cutting unit (saw blade) according to the invention; FIG. 2 is a sectional view, and FIG. 3 is an enlarged detail of the saw blade showing the chain saw's clamping or anchoring to the steel disc.

25 I den på tegningens fig. 1 - 3 viste udførelsesform består skæreaggregatet i det væsentlige af en cirkulær stålskive 1, der er udformet med en centralt opspændingsboring 2. Langs periferien af stålskiven er monteret en standard kædesavskæde 3, hvis længde med tilnærmelse svarer til stålskivens omkreds, således at kæden 3 nærmest omslutter skiven 1 helt. Kæden vender med sine 30 tænder 4 radiært udad, og med tændernes skær 5 vendende fremefter i klingens rotationsretning. Rotationsretningen er angivet med pile 6.25 In the FIG. 1 to 3, the cutting assembly consists essentially of a circular steel disc 1 formed with a central clamping bore 2. A standard chain saw 3 is mounted along the periphery of the steel disc, the length of which approximates to the circumference of the steel disc, so that the chain 3 is closest. encloses washer 1 completely. The chain, with its 30 teeth 4, faces radially outwards, and with the teeth of the teeth 5 facing forward in the direction of rotation of the blade. The direction of rotation is indicated by arrows 6.

Som vist på tværsnittet i fig. 2 er den cirkulære skive forsynet med en ringformet not 7, der strækker sig langs periferien. Denne not 7 er i bredde og dybde tilpasset kædens 3 tapformede medbringere 8, 35 hvilke vender radiært indefter mod skivens 1 centrum. Noten 7 sikrer på denne måde kædens korrekte placering på skiven, idet de enkelte kædeled 9 hviler med deres radiært indadvendende kantflader 10 mod skivens perifere kantflade 11 på begge sider af noten 7. Ved passende opstramning af kæden på langs opnår man på denne måde en meget stabil lejring af kæden på skiven.As shown in the cross section of FIG. 2, the circular disc is provided with an annular groove 7 extending along the periphery. This groove 7 is adapted in width and depth to the pin-shaped carriers 8 of the chain 3, which face radially inwards towards the center of the disc 1. The groove 7 thus ensures the correct positioning of the chain on the disc, with the individual chain links 9 resting with their radially inward edge surfaces 10 against the peripheral edge surface 11 of the disc on both sides of the groove 7. By this way, the chain is tightened longitudinally in this way a very stable bearing of the chain on the disc.

40 I fig. 3 er vist, hvorledes kædens to ender forankres til skiven, og hvorledes kæden strammes op. Til brug for den ene kædeende 12 er skiven 1 forsynet med en udfræsning 13, der i form og størrelse svarer til konturen af et enkelt kædeled 14. Kædeleddet indsættes i udfræsningen ved sidevis forskydning fra den ene side af skiven, hvorefter kædeenden er fast forankret til skiven. Kæden 45 trækkes nu rundt om skiven til det andet forankringspunkt 15, der befinder sig overfor det første punkt i ringe afstand fra dette.40 In FIG. 3 shows how the two ends of the chain are anchored to the disc and how the chain is tightened. For use with one chain end 12, washer 1 is provided with a cutter 13 corresponding in shape and size to the contour of a single chain link 14. The chain link is inserted into the cutter by lateral displacement from one side of the disc, after which the chain end is firmly anchored to disc. The chain 45 is now pulled around the washer to the second anchor point 15 which is opposite the first point at a short distance from it.

Claims

3 DK 172359 B1 The second anchor point 15 is provided with a tightening screw 16, one end of which forms a fork 17 and the other end of which is constituted by a cross bolt 18. The cross bolt 18 is inserted into a partially open cross bore 19 in the disc 1, so that the clamping screw has some movement by oscillation in 5 this point. The fork 17 clamps the last chain link 20 at the respective end of the chain 3 and is connected to the chain by a transverse pin 21 inserted through the chain link pin bore. The tightening screw 16 is conventionally composed of two threaded ends 22 and one of these connecting middle threaded bushings 23. There are opposite threads at the two ends of the screw (right and left threads) so that a twisting of the threaded bushing 23 causes an extension or 10 shortening of the screw as a whole, depending on the direction of rotation. In other words, the tightening screw works almost like a water screw. When the chain is mounted on the disc, the required chain tension (tensioning) can be obtained by appropriate tensioning of the screw 16, as well as the extension or stretching of the chain which arises during operation, is easily and quickly compensated by regular tightening of the screw. 15

1. A rotary cutting unit for a fence mower of a kind particularly used for pruning live fences (field fences) and similar row crops, wherein the pruning is carried out with a fast rotating cutting unit in the form of a circular metal disc with a tooth formed by a replaceable optionally standard type chain saw chain mounted along the periphery of the disc with radially outward saw teeth, characterized in that the chain at one end is detachably anchored to the disc (1) by engagement in a recess corresponding to a single chain link (milling or punching 13). ) in the disc, which recess is immediately within the disc periphery, and that the chain from this anchor point continues into the circular path along the periphery of the disc until another, opposite anchor point (15), constituted by a stud bolt-like tightening screw (16) connecting the last link (20) of the chain at that end with an anchor point (18,19) in the disc itself, h which anchor point may consist of a cross-tab (18) inserted into the washer or a similar fixed holding point of the screw. 30

Rotary cutting assembly according to claim 1, characterized in that the tightening screw (16) is adapted to tighten the chain as it is extended (stretched) during use.