US3904138A - Holding device for knife sets in a shredding device - Google Patents

Holding device for knife sets in a shredding device Download PDF

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Publication number
US3904138A
US3904138A US460185A US46018574A US3904138A US 3904138 A US3904138 A US 3904138A US 460185 A US460185 A US 460185A US 46018574 A US46018574 A US 46018574A US 3904138 A US3904138 A US 3904138A
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US
United States
Prior art keywords
knife
holder plate
cage
knife holder
tensioning bar
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
Application number
US460185A
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English (en)
Inventor
Gerhard Maier
Hans-Joachim Mruck
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.)
Maschinenfabrik B Maier KG
Original Assignee
Maschinenfabrik B Maier KG
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 Maschinenfabrik B Maier KG filed Critical Maschinenfabrik B Maier KG
Application granted granted Critical
Publication of US3904138A publication Critical patent/US3904138A/en
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Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27L—REMOVING BARK OR VESTIGES OF BRANCHES; SPLITTING WOOD; MANUFACTURE OF VENEER, WOODEN STICKS, WOOD SHAVINGS, WOOD FIBRES OR WOOD POWDER
    • B27L11/00—Manufacture of wood shavings, chips, powder, or the like; Tools therefor
    • B27L11/005—Tools therefor
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/485—Cutter with timed stroke relative to moving work
    • Y10T83/494—Uniform periodic tool actuation
    • Y10T83/501—With plural tools on a single tool support
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/929—Tool or tool with support
    • Y10T83/9457—Joint or connection
    • Y10T83/9464—For rotary tool

Definitions

  • a drum-shaped knife cage a [2i] Appl' 460l85 multiplicity of knife crosspieees disposed on the periphery of the drum-shaped knife cage and having re- [30] Foreign Application Priority Data spective knife support surfaces, extending in axial di 1973 Germany 2318731 rection of the drum-shaped knife cage and disposed at an acute angle to a radial plane through the drum- 2 CL 24 23 33 3 3; 3 shaped knife cage.
  • a knife set including a knife holder 24 221; 241 2921 plate and a shredding knife held thereby supported on 511 lm. e1. 13020 18/18 One Of the knife pp Surfaces.
  • the invention relates to a holder device for exchangeable knife sets or packets including knife holder plates and knives for a shredding device, particularly for preliminary or coarsely comminuted wood, with knife cage crosspieces that are disposed at the periphery of a drum-shaped knife cage and have respective knife support surfaces for knife sets fastened at their ends and extending in axial direction of the drumshaped knife cage and disposed at an acute angle to a radial plane through the cage.
  • the knife sets can be secured to the knife cage in different ways. Fastening by screws is one possibility. Fastening by clamps has also been proposed heretofore in German Patent 2,205,489, for example.
  • a knife cage assembly in a knife cage assembly, a drum'shaped knife cage, a multiplicity of knife crosspieces disposed on the periphery of the drum-shaped knife cage and having respective knife support surfaces extending in axial direction of the drum-shaped knife cage and disposed at an acute angle to a radial plane through the drum-shaped knife cage, a knife set including a knife holder plate and a shredding knife held thereby supported on one of the knife support surfaces, the knife holder plate having a surface facing away from the knife, 8. tensioning bar disposed on the surface of the knife holder plate and extending in longitudinal direction of the knife, the tensioning bar being fastened at both ends thereof to the knife holder plate and being braced at least at a central region thereof against the knife holder plate.
  • the tensioning bar has preferably between its two ends, and also preferably in the central region thereof, a lifting or backing-off screw for bracing the tensioning bar against the knife holder plate. Due to this construction, the knife holder plate can be forced to bend, and, in fact, in such a direction that the central region of the knife holder plate flexes or bends toward the knives. If the knife set is pressed at the end thereof, the set therefore rests with its center portion on the support with pre-stressin g. This has the same effect as that of the fastening screw in the center which had been used heretofore. Bending of the knife holder plate in upward direc tion is avoided even in the case where the knives are relatively long. No accumulation of chips occurs between the knife holder plate and the knives, and no vibration of the knives takes place. Moreover, the aforementioned elongated slot in the knives can also be dispensed with.
  • the tension force of the tensioning bar can, of course, also be adjusted by two fastening screws, which can be provided, respectively, at both ends of the knife holder plate for attaching the tensioning bar thereto.
  • the aforementioned lifting 0t backing-off screw is not even necessary.
  • a pressure lobe disposed on either the tensioning bar or the knife holder plate so that it is therebetween suffices instead.
  • the first-mentioned embodiment, namely the embodiment with the lifting screw may well be the more advantageous.
  • the tensioning bar is of rectangular cross section and rests on the knife holder plate edgewise, i.e. is disposed in a plane extending perpendicularly to the direction of application of the tensioning force.
  • the invention of this application is particularly applicable in a construction of the knife cage with knife holder plates that are beveled at both ends thereof to form wedge surfaces and with which clamping jaws having matching or opposing wedge surfaces corre sponding to the wedge surfaces of the holder plates engage to form a clamping device.
  • the tensioning bar is essentially a smooth, continuous strip which also need not project too far above the knife holder plate, it presents no appreciable obstruction to the chips that run off. Nevertheless, it may be advantageous, in accordance with another feature of the invention, to set the tensioning bar more or less into a recess formed in the knife holder plate.
  • FIG. 1 is a fragmentary cross-sectional view of a knife cage assembly according to the invention, taken perpendicularly to the axis of the drum-shaped knife cage;
  • FIG. 2 is a top plan view of FIG. 1 as seen in the direction IIII;
  • FIG. 3 is a top plan view of FIG. 1 taken from the upper left-hand corner thereof of another embodiment of a knife holder plate with a tensioning bar constructed in accordance with the invention
  • FIG. 4 is a cross sectional view taken along the line IVIV of FIG. 3 showing the knife holder plate with a tensioning bar;
  • FIG. 5 is a top plan view similar to that of FIG. 2 but only of a knife holder plate with a tensioning bar in an alternate embodiment.
  • FIG. 1 there is shown one of a multiplicity of knife cage cross pieces 1, uniformly distributed over the circumference of a drum-shaped knife cage, extending in a direction parallel to the axis of the knife edge.
  • the cross section of these knife cage crosspieces I is substantially triangular as seen in FIG. 1. They carry on one of their outer surfaces a so-called knife set, each consisting of knives 2 and a knife holder plate 3.
  • a stock shave or knife 4 is fastened or otherwise secured.
  • the lower side of the knife cage crosspiece l facing radially inwardly toward the cage is covered by a wear-resistant pressure plate 5.
  • a tensioning bar 6 which will be described in greater detail hereinbelow.
  • the knife sets 2 and 3 are tightly held only at the ends thereof.
  • Two clamping jaws 7 and 8 are provided for this purpose.
  • the clamping jaws 7 and 8 are bolted, on the one hand, to the knife cage crosspiece I, as shown diagrammatically by the dot-dash lines, and are in engagement, on the other hand, with the knife holder plate 3 through pairs of wedge surfaces 9, l0 and l1, 12, respectively.
  • the tensioning bar 6 is firmly threadedly secured at both ends thereof to the knife holder plate 3 by means of screws 13 and 14. At its center, the tensioning bar 6 has a tapped hole 15, through which a set screw or lifting screw 16 extends.
  • the lifting screw 16 Upon being tightened, the lifting screw 16 is braced against the surface of the knife holder plate 3 and sets up in the latter a bending stress which tends to bend the center of the knife holder plate 3 in direction toward the knives 2.
  • flush contact of the knife holder plate 3 with the knives 2 is achieved not only at the ends but also in the central region of the knife holder plate 3 when the knife set 2, 3 is in the clamped condition thereof.
  • the bending force applied by the lifting screw 16 also extends to the knives 2 themselves. They, too, are thereby pressed against the knife support surface of the knife cage crosspiece l. A result thereof is the avoidance of the formation of a gap betweem the knife cage crosspiece 1 and the knives 2 during the cutting operation.
  • FIG. 3 shows a different embodiment of the knife holder plate 3 of the invention which is not attached by a clamping device, but is threadedly secured at its ends to the knife cage crosspiece 1 shown in FIGS. 1 and 2, but not shown in FIG. 3.
  • the tensioning bar 6 is threadedly fastened to the knife holder plate 1 by screws 13 and 14.
  • the lifting or backing-ofi' screw 16 corresponding to that of the embodiment of FIG. 2, can be seen.
  • the tensioning bar 6 is received in a recess 17 formed in the knife holder plate 3'.
  • the tensioning bar 6' is screwed at both ends thereof to the knife holder plate 3 by screws 13 and 14. Between both screws, a pressure-applying bump 18 is disposed at the tensioning bar 6'.
  • a knife cage assembly a drum-shaped knife cage, a multiplicity of knife crosspieces disposed on the periphery of said drum-shaped knife cage and having respective knife support surfaces extending in axial direction of said drum-shaped knife cage and disposed at an acute angle to a radial plane through said drumshaped knife cage, a knife set comprising a knife holder plate and a shredding knife held thereby supported on one of said knife support surfaces, said knife holder plate having a surface facing away from said knife, a tensioning bar disposed on said surface of said knife plate and extending in longitudinal direction of said knife, said tensioning bar being fastened at both ends thereof to said knife holder plate and being braced at least at a central region thereof against said knife holder plate.
  • Knife holder device including a lifting screw carried by said tensioning bar between the two ends thereof for bracing said tensioning bar against said knife holder plate.
  • Knife holder device according to claim 2 wherein said lifting screw is located at a central region of said tensioning bar.
  • Knife holder device according to claim 1 wherein said tensioning bar has a rectangular cross section and is disposed in a plane extending perpendicularly to the direction of application of the tensioning force.
  • Knife holder device according to claim 1 wherein said tensioning bar is received in a corresponding recess formed in said knife holder plate.
  • Knife holder device wherein said tensioning bar is screwed at both ends thereof to said knife holder plate by a respective screw fastener, and a pressure-applying bump disposed on one of said tensioning bar and said knife holder plate.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Details Of Cutting Devices (AREA)
  • Threshing Machine Elements (AREA)
  • Mechanical Treatment Of Semiconductor (AREA)
  • Encapsulation Of And Coatings For Semiconductor Or Solid State Devices (AREA)
  • Packaging Of Annular Or Rod-Shaped Articles, Wearing Apparel, Cassettes, Or The Like (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
US460185A 1973-04-13 1974-04-11 Holding device for knife sets in a shredding device Expired - Lifetime US3904138A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2318731A DE2318731C3 (de) 1973-04-13 1973-04-13 Haltevorrichtung für Messerpakete in einer Zerspanungsvorrichtung

Publications (1)

Publication Number Publication Date
US3904138A true US3904138A (en) 1975-09-09

Family

ID=5878011

Family Applications (1)

Application Number Title Priority Date Filing Date
US460185A Expired - Lifetime US3904138A (en) 1973-04-13 1974-04-11 Holding device for knife sets in a shredding device

Country Status (9)

Country Link
US (1) US3904138A (it)
AT (1) AT327517B (it)
BE (1) BE811929A (it)
CA (1) CA984596A (it)
DE (1) DE2318731C3 (it)
ES (1) ES425275A1 (it)
IT (1) IT1004232B (it)
NO (1) NO138129C (it)
SE (1) SE407359B (it)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4055309A (en) * 1976-10-12 1977-10-25 Gehl Company Adjustable cutter bar support
US4190209A (en) * 1978-07-03 1980-02-26 Deere & Company Adjustable shear bar for a harvester cutterhead
US4621775A (en) * 1980-10-16 1986-11-11 Jan Abom High-speed mill for grinding biomass and like material
EP0807500A3 (de) * 1996-05-14 1998-09-23 B. Maier Zerkleinerungstechnik GmbH Zerspaner für Hackschnitzel

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4736781A (en) * 1986-08-26 1988-04-12 Morbark Industries, Inc. Stump disintegrator
AT397787B (de) * 1992-04-23 1994-06-27 Boehler Ybbstalwerke Messerträger
EP0705668A1 (de) * 1994-08-12 1996-04-10 B. Maier Zerkleinerungstechnik GmbH Messerringzerspaner

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2381775A (en) * 1942-01-07 1945-08-07 Fred M Roddy Granulating and cutting machine
US3141485A (en) * 1962-12-04 1964-07-21 Cardwell Machine Company Tobacco shredder
US3355113A (en) * 1964-10-26 1967-11-28 J M J Ind Inc Striking plate for disintegrating mill
US3827643A (en) * 1972-02-05 1974-08-06 Maier Kg Maschf B Wood comminuting apparatus

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2381775A (en) * 1942-01-07 1945-08-07 Fred M Roddy Granulating and cutting machine
US3141485A (en) * 1962-12-04 1964-07-21 Cardwell Machine Company Tobacco shredder
US3355113A (en) * 1964-10-26 1967-11-28 J M J Ind Inc Striking plate for disintegrating mill
US3827643A (en) * 1972-02-05 1974-08-06 Maier Kg Maschf B Wood comminuting apparatus

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4055309A (en) * 1976-10-12 1977-10-25 Gehl Company Adjustable cutter bar support
US4190209A (en) * 1978-07-03 1980-02-26 Deere & Company Adjustable shear bar for a harvester cutterhead
US4621775A (en) * 1980-10-16 1986-11-11 Jan Abom High-speed mill for grinding biomass and like material
EP0807500A3 (de) * 1996-05-14 1998-09-23 B. Maier Zerkleinerungstechnik GmbH Zerspaner für Hackschnitzel

Also Published As

Publication number Publication date
BE811929A (fr) 1974-07-01
DE2318731C3 (de) 1975-12-18
DE2318731A1 (de) 1974-10-24
ATA134574A (de) 1975-04-15
NO138129B (no) 1978-04-03
IT1004232B (it) 1976-07-10
NO138129C (no) 1978-07-12
SE407359B (sv) 1979-03-26
DE2318731B2 (de) 1975-05-07
ES425275A1 (es) 1976-05-16
AT327517B (de) 1976-02-10
NO741314L (no) 1974-10-15
CA984596A (en) 1976-03-02

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