EP0413322B1 - Circular or arc-shaped cutter - Google Patents
Circular or arc-shaped cutter Download PDFInfo
- Publication number
- EP0413322B1 EP0413322B1 EP90115618A EP90115618A EP0413322B1 EP 0413322 B1 EP0413322 B1 EP 0413322B1 EP 90115618 A EP90115618 A EP 90115618A EP 90115618 A EP90115618 A EP 90115618A EP 0413322 B1 EP0413322 B1 EP 0413322B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cutting
- tooth
- obliquely
- cutting edge
- machine blade
- 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
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
- B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
- B26D1/0006—Cutting members therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
- B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
- B26D1/0006—Cutting members therefor
- B26D2001/0046—Cutting members therefor rotating continuously about an axis perpendicular to the edge
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
- B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
- B26D1/0006—Cutting members therefor
- B26D2001/006—Cutting members therefor the cutting blade having a special shape, e.g. a special outline, serrations
Definitions
- the invention relates to a circular or arc-shaped machine knife which has a plurality of cutting teeth with concave cutting edges and tooth gaps therebetween, each tooth gap bottom ending in opposite tooth flanks.
- Such a machine knife is used in particular for cutting bread with a firm rind. It depends on a smooth cut of the material to be cut and a long service life, within which the machine knife does not need to be reground.
- a machine knife of the type mentioned is known from DE-C-23 31 806.
- the tooth flanks of each cutting tooth are of different lengths, so that the tooth flank of each cutting tooth, which is at the front in the cutting direction, is shorter than the other tooth flank. Due to this construction, when the machine knife rotates, the part of the concave cutting edge of the cutting tooth lying in front of the rear tooth flank contributes to cutting the material to be cut. As a result, the sharpness of the cutting teeth is retained for a relatively long time.
- the cutting quality of the known machine knife is adversely affected by the fact that the radially protruding tips of the knife, which are formed by the tooth flanks of the cutting teeth located at the back, are at a large distance from one another.
- the invention has for its object to provide a machine knife of the type mentioned with an improved cutting quality.
- the object is achieved in that the tooth flanks of each cutting tooth are approximately the same length and the tooth flank of the front of each cutting tooth is sharpened obliquely.
- the radially protruding tips of the cutting teeth are relatively close together, which increases the cutting quality.
- a rapid dulling of the tooth flank lying at the front in the cutting direction is avoided in that it is sharpened at an angle.
- the obliquely sharpened area of the tooth flank forms a cutting edge, which contributes to cutting the material to be cut. In this way, even with a high contact pressure, as e.g. penetration of the cutting teeth into the firm rind of a bread is required, a relatively long service life and optimal cutting quality.
- the obliquely sharpened area of the tooth flank can vary depending on Be trained appropriately.
- it can have a straight cutting edge.
- the angle between the straight cutting edge and the radial direction is preferably chosen between 45 ° and 60 °.
- the cutting edge In order to make better use of the cutting edge, in particular for cutting a solid material to be cut, it can also be made concave. In the concave design, the lengths of the cutting edges are increased, which improves the smooth cut even more. The teeth formed at the ends of the cutting edge are more pronounced, so that the cutting teeth can penetrate even better into a solid material to be cut.
- the obliquely sharpened area of the tooth flank can also have a toothed cutting edge.
- the toothing is particularly advantageous when a high contact pressure is required for cutting.
- the machine knife shown in FIG. 1 is designed in an arc shape and has a large number of cutting teeth 1 with concave cutting edges 2 and tooth gaps 3 lying between them.
- the cutting edges 2, as indicated in FIG. 1, are toothed.
- the tooth gaps 3 are concave.
- Each tooth space base 4 ends in opposite tooth flanks 5 and 6.
- the tooth flanks 5 and 6 of each cutting tooth 1 are approximately of the same length, the tooth flank 5 of each cutting tooth 1 lying at the front in the cutting direction being sharpened obliquely.
- the obliquely sharpened area of the tooth flank 5 has a straight cutting edge 7.
- the cutting edge 7 is made by grinding on one side.
- the angle between the straight cutting edge 7 and the radial direction is approximately 50 °.
- Fig. 2 shows on an enlarged scale another embodiment of a cutting tooth 1 'of the cutting knife.
- the obliquely sharpened area of the tooth flank 5 'of this embodiment has a concave cutting edge 7'.
- the cutting edge 7 ' is, as indicated in Fig. 2, toothed.
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Forests & Forestry (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing And Processing Devices For Dough (AREA)
- Control And Other Processes For Unpacking Of Materials (AREA)
- Knives (AREA)
- Apparatuses For Bulk Treatment Of Fruits And Vegetables And Apparatuses For Preparing Feeds (AREA)
- Polishing Bodies And Polishing Tools (AREA)
- Surgical Instruments (AREA)
- Component Parts Of Construction Machinery (AREA)
Abstract
Description
Die Erfindung betrifft ein kreis- oder bogenförmiges Maschinenmesser, das eine Vielzahl von Schneidzähnen mit konkaven Schneiden und dazwischen liegenden Zahnlücken aufweist, wobei jeder Zahnlückengrund in gegenüberliegende Zahnflanken ausläuft.The invention relates to a circular or arc-shaped machine knife which has a plurality of cutting teeth with concave cutting edges and tooth gaps therebetween, each tooth gap bottom ending in opposite tooth flanks.
Ein derartiges Maschinenmesser dient insbesondere zum Schneiden von Brot mit fester Rinde. Dabei kommt es auf einen glatten Schnitt des Schneidgutes und eine lange Standzeit an, innerhalb der das Maschinenmesser nicht nachgeschliffen zu werden braucht.Such a machine knife is used in particular for cutting bread with a firm rind. It depends on a smooth cut of the material to be cut and a long service life, within which the machine knife does not need to be reground.
Ein Maschinenmesser der genannten Art ist aus der DE-C-23 31 806 bekannt. Bei diesem Maschinenmesser sind die Zahnflanken jedes Schneidzahns unterschiedlich lang ausgebildet, so daß die in Schneidrichtung vorn liegende Zahnflanke jedes Schneidzahns kürzer ist als die andere Zahnflanke. Aufgrund dieser Konstruktion trägt bei Rotation des Maschinenmessers der vor der hinteren Zahnflanke liegende Teil der konkaven Schneide des Schneidzahns zum Schneiden des Schneidgutes bei. Dies hat zur Folge, daß die Schärfe der Schneidzähne relativ lange erhalten bleibt.A machine knife of the type mentioned is known from DE-C-23 31 806. In the case of this machine knife, the tooth flanks of each cutting tooth are of different lengths, so that the tooth flank of each cutting tooth, which is at the front in the cutting direction, is shorter than the other tooth flank. Due to this construction, when the machine knife rotates, the part of the concave cutting edge of the cutting tooth lying in front of the rear tooth flank contributes to cutting the material to be cut. As a result, the sharpness of the cutting teeth is retained for a relatively long time.
Die Schneidqualität des bekannten Maschinenmessers wird jedoch dadurch beeinträchtigt, daß die radial vorstehenden Spitzen des Messers, die durch die hinten liegenden Zahnflanken der Schneidzähne gebildet werden, einen großen Abstand voneinander haben.However, the cutting quality of the known machine knife is adversely affected by the fact that the radially protruding tips of the knife, which are formed by the tooth flanks of the cutting teeth located at the back, are at a large distance from one another.
Dieser Nachteil kann nicht einfach dadurch beseitigt werden, daß die vordere und hintere Zahnflanke der Schneidzähne in gleicher Länge ausgebildet werden. Dabei würde die durch die vordere Zahnflanke gebildete Spitze beim Eindringen der Schneidzähne in ein festes Schneidgut, z.B. die Rinde eines Brotes, einer relativ hohen Belastung ausgesetzt und daher schnell abgenutzt werden. Hierdurch würde die Standzeit des Maschinenmessers beträchtlich herabgesetzt. Die vorzeitig stumpf gewordene vordere Spitze der Schneidzähne würde das Schneidgut, z.B. das Brot, aufreißen, wodurch der gewünschte glatte Schnitt nicht erzielt werden könnte.This disadvantage cannot be eliminated simply by forming the front and rear tooth flanks of the cutting teeth in the same length. The tip formed by the front tooth flank would penetrate the cutting teeth into a solid material to be cut, e.g. the rind of a bread, exposed to a relatively high load and therefore quickly worn out. This would considerably reduce the service life of the machine knife. The prematurely blunted front tip of the cutting teeth would the bread, tear open, whereby the desired smooth cut could not be achieved.
Der Erfindung liegt die Aufgabe zugrunde, ein Maschinenmesser der eingangs genannten Art mit einer verbesserten Schneidqualität zu schaffen.The invention has for its object to provide a machine knife of the type mentioned with an improved cutting quality.
Die Aufgabe wird erfindungsgemäß dadurch gelöst, daß die Zahnflanken jedes Schneidzahns etwa gleich lang sind und die in Schneidrichtung vorn liegende Zahnflanke jedes Schneidzahns schräg angeschärft ist.The object is achieved in that the tooth flanks of each cutting tooth are approximately the same length and the tooth flank of the front of each cutting tooth is sharpened obliquely.
Aufgrund der erfindungsgemäßen Konstruktion liegen die radial vorstehenden Spitzen der Schneidzähne relativ eng beieinander, wodurch die Schneidqualität erhöht wird. Ein schnelles Abstumpfen der in Schneidrichtung vorn liegenden Zahnflanke wird dadurch vermieden, daß diese schräg angeschärft ist. Der schräg angeschärfte Bereich der Zahnflanke bildet eine Schneide, die zum Schneiden des Schneidgutes beiträgt. Auf diese Weise wird selbst bei einem hohen Anpreßdruck, wie er z.B. zum Eindringen der Schneidzähne in die feste Rinde eines Brotes erforderlich ist, eine relativ lange Standzeit und eine optimale Schneidqualität erzielt.Because of the construction according to the invention, the radially protruding tips of the cutting teeth are relatively close together, which increases the cutting quality. A rapid dulling of the tooth flank lying at the front in the cutting direction is avoided in that it is sharpened at an angle. The obliquely sharpened area of the tooth flank forms a cutting edge, which contributes to cutting the material to be cut. In this way, even with a high contact pressure, as e.g. penetration of the cutting teeth into the firm rind of a bread is required, a relatively long service life and optimal cutting quality.
Der schräg angeschärfte Bereich der Zahnflanke kann je nach Bedarf geeignet ausgebildet sein. Er kann z.B. eine gerade Schneidkante aufweisen. Dabei wird der Winkel zwischen der geraden Schneidkante und der radialen Richtung vorzugsweise zwischen 45° und 60° gewählt.The obliquely sharpened area of the tooth flank can vary depending on Be trained appropriately. For example, it can have a straight cutting edge. The angle between the straight cutting edge and the radial direction is preferably chosen between 45 ° and 60 °.
Um die Schneidkante insbesondere zum Schneiden eines festen Schneidgutes noch besser auszunutzen, kann diese auch konkav gestaltet sein. Bei der konkaven Gestaltung sind die Längen der Schneidkanten vergrößert, was den glatten Schnitt noch verbessert. Die an den Enden der Schneidkante ausgebildeten Zähne sind stärker ausgeprägt, so daß die Schneidzähne noch besser in ein festes Schneidgut eindringen können.In order to make better use of the cutting edge, in particular for cutting a solid material to be cut, it can also be made concave. In the concave design, the lengths of the cutting edges are increased, which improves the smooth cut even more. The teeth formed at the ends of the cutting edge are more pronounced, so that the cutting teeth can penetrate even better into a solid material to be cut.
In einer anderen Ausführung kann der schräg angeschärfte Bereich der Zahnflanke auch eine verzahnte Schneidkante aufweisen. Die Verzahnung ist insbesondere dann vorteilhaft, wenn zum Schneiden ein hoher Anpreßdruck erforderlich ist.In another embodiment, the obliquely sharpened area of the tooth flank can also have a toothed cutting edge. The toothing is particularly advantageous when a high contact pressure is required for cutting.
Im folgenden werden zwei Ausführungsbeispiele der Erfindung anhand der Zeichnung näher beschrieben. Es zeigen:
- Fig. 1 eine Seitenansicht eines Maschinenmessers im Ausschnitt und
- Fig. 2 einen Schneidzahn eines anderen Maschinenmessers in gegenüber Fig. 1 vergrößertem Maßstab.
- Fig. 1 is a side view of a machine knife in section and
- Fig. 2 shows a cutting tooth of another machine knife on an enlarged scale compared to Fig. 1.
Das in Fig. 1 dargestellte Maschinenmesser ist bogenförmig gestaltet und weist eine Vielzahl von Schneidzähnen 1 mit konkaven Schneiden 2 und dazwischen liegenden Zahnlücken 3 auf. Die Schneiden 2 sind, wie in Fig. 1 angedeutet, verzahnt. Die Zahnlücken 3 sind konkav ausgebildet.The machine knife shown in FIG. 1 is designed in an arc shape and has a large number of cutting
Jeder Zahnlückengrund 4 läuft in gegenüberliegende Zahnflanken 5 und 6 aus. Die Zahnflanken 5 und 6 eines jeden Schneidzahns 1 sind etwa gleich lang, wobei die in Schneidrichtung vorn liegende Zahnflanke 5 eines jeden Schneidzahns 1 schräg angeschärft ist.Each
Bei dem in Fig. 1 gezeigten Ausführungsbeispiel weist der schräg angeschärfte Bereich der Zahnflanke 5 eine gerade Schneidkante 7 auf. Die Schneidkante 7 ist durch einseitiges Anschleifen hergestellt. Der Winkel zwischen der geraden Schneidkante 7 und der radialen Richtung beträgt etwa 50°.In the embodiment shown in FIG. 1, the obliquely sharpened area of the tooth flank 5 has a
Fig. 2 zeigt in vergrößertem Maßstab eine andere Ausführung eines Schneidzahns 1′ des Schneidmessers. Der schräg angeschärfte Bereich der Zahnflanke 5′ dieses Ausführungsbeispiels weist eine konkave Schneidkante 7′auf. Die Schneidkante 7′ ist weiterhin, wie es in Fig. 2 angedeutet ist, verzahnt.Fig. 2 shows on an enlarged scale another embodiment of a cutting tooth 1 'of the cutting knife. The obliquely sharpened area of the tooth flank 5 'of this embodiment has a concave cutting edge 7'. The cutting edge 7 'is, as indicated in Fig. 2, toothed.
Claims (5)
- Circular or arc-shaped machine blade with numerous cutting teeth (1; 1′) with concave cutting edges (2) and intermediate tooth spaces (3), where each bottom land (4) tapers off into opposite tooth flanks (5,6; 5′,6), characterised in that the tooth flanks (5,6; 5′,6) of each cutting tooth (1; 1′) are of approximately equal length and the front tooth edge (5; 5′) of each cutting tooth (1; 1′), seen in cutting direction, is sharpened obliquely.
- Machine blade according to Claim 1, characterised in that the obliquely sharpened area of the tooth flank (5) has a straight cutting edge (7).
- Machine blade according to Claim 2, characterised in that the angle between the straight cutting edge (7) and the radial direction is between 45° and 60°.
- Machine blade according to Claim 1, characterised in that the obliquely sharpened area of the tooth flank (5′) has a concave cutting edge (7′).
- Machine blade according to one of the Claims 1 to 4, characterised in that the obliquely sharpened area of the tooth flank (5′) has a toothed cutting edge (7′).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT90115618T ATE86908T1 (en) | 1989-08-18 | 1990-08-16 | CIRCULAR OR ARC-SHAPED MACHINE KNIFE. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3927262A DE3927262A1 (en) | 1989-08-18 | 1989-08-18 | CIRCULAR OR ARCED MACHINE KNIFE |
DE3927262 | 1989-08-18 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0413322A1 EP0413322A1 (en) | 1991-02-20 |
EP0413322B1 true EP0413322B1 (en) | 1993-03-17 |
Family
ID=6387352
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP90115618A Expired - Lifetime EP0413322B1 (en) | 1989-08-18 | 1990-08-16 | Circular or arc-shaped cutter |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0413322B1 (en) |
AT (1) | ATE86908T1 (en) |
DE (2) | DE3927262A1 (en) |
DK (1) | DK0413322T3 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4117229C2 (en) * | 1991-05-27 | 1994-06-09 | Axel Balke | Device for cutting and pulping slaughtered goods |
DE4341398C1 (en) * | 1993-12-04 | 1995-03-30 | Axel Balke | Knife for dismembering and splitting up carcasses of slaughtered animals in particular |
CN103624856A (en) * | 2013-12-18 | 2014-03-12 | 蓝帜(南京)工具有限公司 | Scraper for processing concave profile of wood and plastic sheet materials |
DE102019201519A1 (en) * | 2019-02-06 | 2020-08-06 | Hagedorn Spiralmesser GmbH | Toothed cutting knife |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2260134C2 (en) * | 1972-12-08 | 1984-05-10 | Karl Heinz 5650 Solingen Balke | Circular or arcuate machine knife for cutting in particular bread with a firm crust |
FI56636C (en) * | 1977-06-21 | 1980-03-10 | Paraisten Kalkki Oy | DAMMFRI SKAERNING AV EN ROERLIG MINERALULLSBANA |
-
1989
- 1989-08-18 DE DE3927262A patent/DE3927262A1/en active Granted
-
1990
- 1990-08-16 DE DE9090115618T patent/DE59001038D1/en not_active Expired - Fee Related
- 1990-08-16 AT AT90115618T patent/ATE86908T1/en not_active IP Right Cessation
- 1990-08-16 EP EP90115618A patent/EP0413322B1/en not_active Expired - Lifetime
- 1990-08-16 DK DK90115618.2T patent/DK0413322T3/en active
Also Published As
Publication number | Publication date |
---|---|
DE3927262C2 (en) | 1992-12-17 |
DE3927262A1 (en) | 1991-02-21 |
DK0413322T3 (en) | 1993-07-26 |
EP0413322A1 (en) | 1991-02-20 |
DE59001038D1 (en) | 1993-04-22 |
ATE86908T1 (en) | 1993-04-15 |
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