DK168222B1

DK168222B1 - Pivotable scraping knife for an abrading device for skins

Info

Publication number: DK168222B1
Application number: DK128190A
Authority: DK
Inventors: Goeran Andtsjoe
Original assignee: Erco Mek Ab Oy
Priority date: 1989-05-29
Filing date: 1990-05-23
Publication date: 1994-02-28
Also published as: DK128190D0; FI81836C; FI892599A; FI81836B; DK128190A; FI892599A0

Description

DK 168222. B1 iDK 168222. B1 i

Opfindelsen angår et drejeligt skrabeskær af elastisk materiale til en fortrinsvis med en kontinuerligt roterende valse forsynet afskrabningsindretning til huder, 5 hvilket skrabeskær omfatter et stel med et centralt spindelhul og en ydre med skråtskårne kanter forsynet periferioverflade.BACKGROUND OF THE INVENTION 1. Field of the Invention The invention relates to a rotatable scraper of elastic material for a preferably provided with a continuous rotating roller scraping device, which scraper includes a frame with a central spindle hole and an outer surface with bevelled edges.

Ved anvendelse af sådanne afskrabningsindretninger flås pelsdyrets skind til en "skede", dvs- således at skindet 10 skæres løs ved dyrets bagparti, hvorefter skindet trækkes med vrangen udad over kroppen mod dets forparti. Skindet danner herved et i sin omkreds helt "rør", som med bagsiden udad kan spændes over en passende dimensioneret svagt konisk roterende valse med rundt tværsnit til afskrab-15 ningsbehandlingen.Using such scraping devices, the fur of the fur animal is peeled into a "sheath", i.e., the skin 10 is cut loose at the rear of the animal, after which the fur is pulled outwardly over the body towards its front portion. The skin thereby forms a completely "tube" in its circumference, which can be stretched outwardly over an appropriately dimensioned slightly conical rotating roller with a circular cross section for the scraping treatment.

De kendte drejelige skrabeskær af elastisk materiale har en ydre med skråtskårne ægge forsynet periferioverflade, hvor man har forsøgt at tage hensyn til valsens rotationsbevægelse, således at skærets bevægelse på afskrabnings-20 stedet så vidt muligt skal ligge i valsens længderetning. Dette sker, for at vridning af skindet på valsen og dermed folder på skindet skal kunne forhindres.The known pivotal scraping inserts of elastic material have an outer peripheral surface with bevelled edges, whereby an attempt has been made to take into account the rotational movement of the roll, so that the movement of the cutter at the scraping site should be as long as possible in the longitudinal direction of the roll. This is done in order to prevent twisting of the skin on the roller and thus folds on the skin.

Skæret er normalt monteret på en vogn forsynet med en drivindretning, som muliggør forskydning af skæret i 25 valsens længderetning langs en slidske. Skæret er desuden lejret således i vognen, at skæret kan svinges i et vinkelret på valsens længdeaksel stående plan til en afskrabningsstilling mod valsen, henholdsvis tilbage til en fristil ling.The cutter is usually mounted on a trolley provided with a drive device which allows the cutting of the cutter in the longitudinal direction of the roll along a slit. In addition, the cutter is mounted in the carriage so that the cutter can be pivoted in a plane perpendicular to the longitudinal axis of the roll for a scrapping position against the roll or back to a free position, respectively.

30 Eftersom de kendte drejelige skrabeskær er mere eller mindre kompakte, fører dette til, at de ikke former sig særlig godt efter den runde koniske valse ved afskrabningen. Deres stivhed er for stor til at muliggøre en formning efter valsen. Dette har til følge, at skærets DK 168222 B1 2 skrabende flade mod skindet på valsen bliver meget lille. Dette indvirker direkte på effektiviteten af afskrabningen og medfører også meget ujævn slitage af skæret.30 Since the known pivotal scraping inserts are more or less compact, this means that they do not form very well after the round conical roller during scraping. Their stiffness is too large to allow for a roll forming. As a result, the scraping surface of the insert DK 168222 B1 2 against the skin of the roller becomes very small. This directly affects the efficiency of the scraping and also causes very uneven wear of the cutter.

5 I en version af et kendt skrabeskær har man efter fremstilling af skæret ved støbning formet æggens skrabe-overflade, således at den ligger an mod skindet på valsen med en større flade. Denne formning må gøres separat for hver æg på skrabeskæret og kræver derfor meget tid og for-10 øger fremstillingsomkostningerne betydeligt.5 In a version of a known scraping cutter, after making the cutter by casting, the scraping surface of the eggs has been shaped so that it abuts against the skin of the roller with a larger surface. This molding must be done separately for each egg on the scraper cutter and therefore requires a lot of time and significantly increases the manufacturing cost.

En væsentlig forbedring i forhold til de ovenfor nævnte problemer opnås med et skrabeskær af elastisk materiale ifølge opfindelsen, hvor skrabeskæret ægge er anbragt på den ydre periferi af et fra skrabeskærets stel hovedsage-15 lig tallerkenformet fremskudt parti. Denne konstruktion indebærer stor fleksibilitet og formningsevne hos skæret, således at der opnås en betydelig større anlægsflade mellem skrabeskær og valse i valsens længderetning. Konstruktionen muliggør også, at der til skrabeskæret kan anven-20 des et betydeligt hårdere materiale end tidligere med forbedret slidstyrke til følge.A substantial improvement over the above-mentioned problems is achieved with an elastic material scraper cutter according to the invention, where the scraper cutting edge is arranged on the outer periphery of a substantially plate-shaped portion of the scraping cutter frame. This construction involves great flexibility and forming ability of the cutter, so that a significantly larger abutment surface is obtained between scraper cutter and roller in the longitudinal direction of the roller. The construction also allows a much harder material to be used for the scraper cutter than previously, with improved wear resistance.

Opfindelsens yderligere kendetegn fremgår af patentkravene.Further features of the invention are set forth in the claims.

Opfindelsen beskrives i det følgende nærmere under henvis-25 ning til den ledsagende tegning, på hvilken: fig. 1 skematisk viser et eksempel på en afskrabningsindretning til huder set fra oven, fig. 2 viser et eksempel på et skrabeskær ifølge opfindelsen i aksial retning, 30 fig. 3 viser et tværsnit af skrabeskæret ifølge fig. 2, og DK 168222 B1 3 fig. 4 viser skæret set fra kanten i pilene A’s retning i fig. 3.The invention will now be described in more detail with reference to the accompanying drawings, in which: 1 is a schematic top view of an example of a skin scraping device; FIG. 2 shows an example of a scissor cutter according to the invention in the axial direction; FIG. 3 shows a cross section of the scraper cutter according to FIG. 2, and DK 168222 B1 3 fig. 4 shows the cut from the edge in the direction of arrows A in fig. Third

Afskrabningsindretningen ifølge fig. 1 omfatter hovedsa-5 gelig en rammekonstruktion 14, i hvilken to parallelle valser 2 er lejret i en passende drejevugge 15. Ved hjælp af drejevuggen 15 kan valserne efter tur indstilles i en afskrabningsstilling og en fikserings- og forberedelsesstilling. Når den ene valse er i afskrabningsstillingen, 10 er den anden valse i fikserings- og forberedelsesstillingen. Valsen i afskrabningsstillingen modtager en rotationskraft fra et passende drivaggregat 16.The scraping device according to FIG. 1, generally comprises a frame structure 14 in which two parallel rollers 2 are housed in a suitable turning cradle 15. By means of the turning cradle 15, the rollers can in turn be adjusted in a scraping position and a fixing and preparation position. When one roller is in the scrapping position, the other roller is in the fixing and preparation position. The roller in the scraper position receives a rotational force from a suitable drive assembly 16.

Afskrabningsanordningen omfatter også en vogn 4, der kan forskydes i valsen 2' s længderetning langs med en slidske 15 3 med et passende drivaggregat 17. På vognen 4 er et dre jeligt drevet afskrabningsskær 1 monteret. Skæret l's drivaksel er lejret således i vognen, at skæret kan drejes i et vinkelret på valsen 2’s længdeaksel stående plan mellem en afskrabningsstilling i anlæg mod valsen og 20 en fristilling. Når slidsken 3 ikke er helt parallel me*d valsen længdeaksel, sker der under hver arbejdscyklus en aksiel forskydning af skærets anlægszone mod den over valsens spændte hud, hvilket resulterer i en jævnere slitage af skrabeskærets ægge.The scraping device also comprises a carriage 4 which can be displaced longitudinally of the roller 2 along with a slit 15 3 with a suitable drive assembly 17. On the carriage 4 a rotatable scraping cutter 1 is mounted. The drive shaft of the cutter 1 is mounted in the carriage so that the cutter can be rotated perpendicular to the longitudinal axis of the roller 2 between a scraping position in abutment against the roller and a free position. When the wear sheath 3 is not completely parallel to the longitudinal shaft of the roller, during each work cycle an axial displacement of the insertion zone of the insert against the tanned skin of the roller results in a smoother wear of the scraper cutting edge.

25 Fig. 2-4 viser et eksempel på et skrabeskær ifølge opfindelsen. Skrabeskæret omfatter et centralt spindelhul 4 og et fra skrabeskærets cylindriske stel 3 fremspringende rotationssymmetrisk tallerkenformet parti 7. Skrabeskærets ægge 5, der kan være 4-20 i antal, ligger på det taller-30 kenformede parti 7' s ydre periferi 6. I den ende af det cylindriske stel 3, hvorfra det tallerkenformede parti 7 udgår, er der hensigtsmæssigt optaget en central cylindrisk fordybning 8. Denne fordybning 8 tjener som indfældningsrum for det fastgørelsesmiddel, med hvilket skrabe- / DK 168222 Bl 4 skæret fastgøres på spindelen, hvilket forhindrer f.eks. hår og lignende i at blive hængende i spindelen og fastgørelsesmidlet. Skrabeskærets cylindriske stel 3 er i sin 5 modsat fordybningen 8 vendende ende forsynet med mindst to boringer 12, 13 til modtagelse af tilsvarende fremspring i spindelen. Denne konstruktion forhindrer utilsigtet drejning af skæret i forhold til spindelakslen.FIG. 2-4 shows an example of a scraping cutter according to the invention. The scraper cutter comprises a central spindle hole 4 and a rotationally symmetrical plate-shaped portion 7 protruding from the scissor cutter frame 3, which can be 4-20 in number on the outer circumferential plate 6. of the cylindrical frame 3 from which the plate-shaped portion 7 is projected, a central cylindrical groove 8 is conveniently accommodated. .g. hair and the like in being stuck in the spindle and the fastener. The cylindrical frame 3 of the scraping cutter is provided in its 5 opposite the recess 8 with at least two bores 12, 13 for receiving corresponding projections in the spindle. This construction prevents inadvertent rotation of the cutter relative to the spindle shaft.

Skrabeskærets ægge 5 har et hovedsagelig trekantet tvær-10 snit, hvorved æggenes dybde ligger i området 7-20 mm, fortrinsvis 8-12 mm. Æggene 5's forkant 10 står fortrinsvis vinkelret på det plan, som tangerer periferioverfladen 6 i æggene 5's spids 9, og bagkanten 11 danner én 5-25° vinkel, fortrinsvis ca. 15e vinkel med det tilsva-15 rende plan.The scraper cutting edge 5 has a substantially triangular cross-section, whereby the depth of the eggs is in the range of 7-20 mm, preferably 8-12 mm. The leading edge 10 of the eggs 5 is preferably perpendicular to the plane tangent to the peripheral surface 6 of the tip 9 of the eggs 5, and the trailing edge 11 forms one 5-25 ° angle, preferably approx. 15th angle with the corresponding plane.

Skrabeskærets ægge 5 er hensigtsmæssigt skråtskårne, således at hver æg danner en vinkel på ca. 20 til 30° med et aksialt plan, for at den bedst mulige bearbejdning af huden opnås uden tendens til vridning.Conveniently, the scraper cutting eggs 5 are slanted so that each egg forms an angle of approx. 20 to 30 ° with an axial plane to achieve the best possible skin processing without any tendency to twist.

20 Vinklen mellem skrabeskærets kegleformede periferioverflade 6 og spindelens centrumaksel er hensigtsmæssigt mellem 30 og 60°, helst ca. 45°.The angle between the cone-shaped peripheral surface 6 of the scraping cutter and the center shaft of the spindle is suitably between 30 and 60 °, preferably approx. 45 °.

Ved at æggene 5 er anbragt på skrabeskærets meget fleksible tallerkenformede parti 7, opnås en væsentlig større be-25 røringsflade mellem skrabeskærets ægge 5 og en over valsen 2 spændt hud både i valsens længderetning og tværretning. Dette medfører, at fremføringen af skrabeskæret i valsen 2's længderetning kan forøges flere gange i sammenligning med, hvad der er tilfældet med et konventionelt 30 skrabeskær i skrabeindretninger med kontinuerligt roterende valser.By placing the eggs 5 on the very flexible plate-shaped portion 7 of the scraper cutter, a significantly larger contact surface is obtained between the scraper cutter's eggs 5 and a skin which is stretched across the roll 2 in both the longitudinal and transverse directions of the roll. This means that the advance of the scraper cutter in the longitudinal direction of the roller 2 can be increased several times compared to that of a conventional scraper cutter in scraping devices with continuously rotating rollers.

Claims

A swivel scraper (1) of resilient material for a preferably hides scraper device provided with a continuously rotating roller (2), said scraper (1) comprising a frame (3) with a central spindle hole (4) and an exterior having a bevel cut edges (5) provided with a peripheral surface (6), characterized in that the edge (5) of the scraper cutter (1) is arranged on the outer periphery (6) of a mainly plate-shaped portion (7) formed from the scraper cutter frame (3) -

Scratch cutter (1) according to claim 1, characterized in that the plate-shaped portion (7) provided with eggs protrudes from one end of a cylindrical central frame (3).

Scraper cutter (1) according to claim 2, characterized in that the plate-shaped portion (7) encloses the cylindrical frame (3).

Scratch cutter (1) according to claim 3, characterized in that a cylindrical recess (8) is received at the end of the frame (3) from which the plate-shaped portion (7) protrudes.

5. Scratch cutter (1) according to one of claims 1-4, characterized in that the scraper cutter (1) has 4-20 beveled edges (5).

Scratching cutter (1) according to any one of claims 1-5, characterized in that the cutting edge (9) of the eggs (5) forms an angle of 20-30 ° with an axial plane.

Scratching cutter (1) according to any one of claims 1-6, characterized in that the depth of the eggs (5) is 7-20 mm. DK 168222 B1 6

Scratch cutter (1) according to any one of claims 1-7, characterized in that the leading edge (10) of the eggs (5) is perpendicular to the plane tangent to the peripheral surface (6) 5 at the tip of the eggs (5) and the trailing edge ( 11) forms an angle of 5-25 ° with the corresponding plane.

Scratch cutter (1) according to any one of claims 1-8, characterized in that at least two bores (12, 13) are provided in the cylindrical frame (3) of the scraping cutter (1) at the opposite end of the recess (8). of the spindle's corresponding projection to prevent accidental rotation of the scraper shaft (1) relative to the spindle shaft.