US3309765A - Apparatus and methods for replacing the knife units of a woodcutting machine - Google Patents

Apparatus and methods for replacing the knife units of a woodcutting machine Download PDF

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Publication number
US3309765A
US3309765A US463306A US46330665A US3309765A US 3309765 A US3309765 A US 3309765A US 463306 A US463306 A US 463306A US 46330665 A US46330665 A US 46330665A US 3309765 A US3309765 A US 3309765A
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US
United States
Prior art keywords
frame
knife
carrier
units
machine
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
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US463306A
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English (en)
Inventor
Kirsten Paul Arthur
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Individual
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Individual
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Publication of US3309765A publication Critical patent/US3309765A/en
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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
    • B27L11/02—Manufacture of wood shavings, chips, powder, or the like; Tools therefor of wood shavings or the like
    • 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
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49718—Repairing
    • Y10T29/49721—Repairing with disassembling
    • Y10T29/4973—Replacing of defective part
    • 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
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49815—Disassembling
    • Y10T29/49822—Disassembling by applying force
    • 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
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • 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
    • Y10T29/00—Metal working
    • Y10T29/53—Means to assemble or disassemble
    • Y10T29/53478—Means to assemble or disassemble with magazine supply

Definitions

  • An object of the invention is to provide improved apparatus and methods for replacement of knife units which avoids the above deficiencies.
  • this object is fulfilled by providing a frame with receiving stations for the knifeandknife holder units and moving it into such a position relative to the tool carrier that the units may be moved from the tool carrier into the receiving stations of the frame and vice-versa by mechanical, electromagnetic, pneumatic or hydraulic means.
  • the frame may be equipped with fewer receiving stations than the tool carrier so that two or more frames are required for a knife change.
  • FIG. 1 is a side elevation of a cutting machine with disk-shaped tool carrier
  • FIG. 2 is a cross-section along the line A-B in FIG. 1;
  • FIG. 3 is an elevational view of a cutting machine with cylindrical tool carrier, in the upper half with annular frame and in the lower half 'without the same;
  • FIG. 4 is a side elevation of FIG. 3 wherein the upper half of the knife ring and annular frame is shown in cross-section along the line CD in FIG. 3.
  • FIGS. 1 and 2 show an embodiment of the invention in the form of a disk-shaped tol carrier 1 rotating about a shaft 2.
  • the too carrier is fitted with inserts 31-36 in which are mounted marking knives 4 and cutting knives 5.
  • the wood 7 to be cut is mounted on a support 6 and pressed by a feeding mechanism against the end face of the tool carrier 1 over which the markers 4 and the cutting knives 5 project in accordance with the required thickness of the chips.
  • the inserts 31-36 are fitted without screws in the tool carrier 1 in that they engage positively along the periphery of the tool carrier while a resilient looking bar presses each insert from the centre of the tool carrier towards the periphery thereof (lower half of FIG. 2).
  • the actual chucking of the inserts is achieved by the centrifugal force of the inserts, locking bars and of the parts connected therewith.
  • FIGS. 1 and 2 show a cutting machine at standstill in which the markers 4 and the cutting knives 5 in the inserts 3136 have become blunt and must be replaced.
  • a frame 8 according to the invention contains an exchange set of inserts 41 to 46 with reground markers 4 and cutting knives 5 adjusted cotrectly relative to the end face of the inserts and ready to be fitted into the machine.
  • the frame 8 is fitted into a fixed guide 9 which is conveniently rigidly or detachably connected with the main frame 1% of the machine.
  • the frame 8 has on its left side (in the centre of FIG. 1) an empty receiving station for the insert 31.
  • Ratchets and locking bars ensure that during the fitting of the frame 8 into the guide 9 the empty receiving station is positioned exactly so that it faces the insert 31 of the tool carrier 1.
  • the corresponding position of the tool carrier 1 is fixed by a locking bar 11 which engages into a recess 12 of the tool carrier.
  • the locking bar 11 may be actuated by a cylinder 13 or by an electromagnet.
  • the frame 8 has windows 14 through which a plate magnet 15 can be moved (FIGS. 1 and 2) by means of a hydraulic or pneumatic actuating cylinder 16.
  • Guide rods 17 of the plate magnet 15 are mounted in the guide 9 and/ or directly on the main frame 10 so that with locking bar 11 engaged, the plate magnet faces exactly one of the inserts 31 to 36 of the tool carrier 1.
  • the frame 8 with the inserts 41 to 46 holding the ground knives may be fitted into the guide 9 during the operation of the machine so that the empty receiving station of the frame is aligned with the plate magnet 15 which is now in its right hand terminal position in which it abuts against supports 18 of the guide rods :17 located on the frame or on the main frame of the machine (FIG. 2, top).
  • the tool carrier 1 is rotated by a main motor 19 or an auxiliary motor and this rotation is stopped by the locking bar 11 entering one of the notches 112. Thereafter, a hydraulic or pneumatic impulse is given to the cylinder 16 of the plate magnet 15 by mechanical and/or electrical and/or hydraulic and/or pneumatic controls and connections whereby this plate magnet is pushed through the window of the empty receiving station of the frame 9 to the insert 31.
  • the indexing movement may also be effected by an operating cylinder by means of a cam plate (not shown) as known in the art.
  • an impulse is applied to a hydraulic or pneumatic cylinder unit 20 whose piston rod 21 unlocks the insert 31 and moves it into the exchange position.
  • FIG. 2 This position of the insert in the frame is se- Patented Mar. 21, 1967- cured, by means not shown and known in the art, by spring loaded locks or the like.
  • the guide 9 or the housing for the tool carrier 1 may be equipped with nozz-les whereby after the removal of the insert from the tool carrier the free receiving station is blown out with compressed air.
  • FIGS. 3 and 4 show another embodiment of the invention in which a cutting machine has a cylindrical tool carrier 101 rotating about a shaft 102.
  • This tool carrier has the form of a dished disk.
  • the knives 103 are located on the inner cylindrical surface of the dish and the word to be cut and having a length of about 3 cm. is thrown against the inner surface of the dish by a rotating cross 104 having a sense of rotation opposite to that of the tool carrier 101.
  • the knives 103 are connected by screws with knife holders 105 as known in the art.
  • the units 131 to 142 consisting of knives and knife holders are lifted off the tool carrier for grinding and setting the knives.
  • An exchange set of units 151 to 162 is available in order to reduce to a minimum the inoperative machine time.
  • chucking wedges 106 suspended by heads 107 in the tool carrier 101, slightly movable in a substantially radial direction and slightly pressed by springs 108 towards the interior of the tool carrier when the machine is at standstill. In this way, the units 131 to 142 which are unblocked may be extracted vaxially by hand and units 151 to 162 with ground knives may be inserted.
  • this know construction may be modified and improved by providing an annular frame 109 with receiving stations 110 containing a set of units 152 to 162 with ground knives 103, the number of these units being preferably smaller byone (e.g. 151) and to place this frame 109 concentrically and rotatively in front of the tool carrier 101 so that the units 131 to 142 containing the blunt knives may be exchanged for units 152 to 162 containing sharp knives as in the first embodiment.
  • the unit 151 is fitted after the removal of the annular frame 109 into the empty receiving station 142 of the tool carrier 101.
  • a simple construction results by extending the shaft 111 of the throw cross 104 by a section 112 on which may be fitted the annular frame 109 consisting of flanges, spokes and hub.
  • the automatic knife change is effected automatically by means of electrical and/or pneumatic and/or hydraulic controls and connections, not shown and known in the art, in the following manner.
  • the machine is stopped and the door-shaped cover (not shown) which closes the machine housing 113 during the operation is opened.
  • the annular frame 109 holding the units 152 to 162 with ground knives is fitted to a stub 112 of the throw cross shaft 111 and a cylinder 114 whose piston rod carries on its free end a magnet 115 is pivoted downwards.
  • the joint 116 on the machine is blocked.
  • the tool carrier 111 is rotated by its motor I through a belt pulley 117, an operating cylinder with cam plate or the like and the rotation is stopped by a locking bar 118 entering into a notch 119.
  • the annular frame 109 is rotated by hand until an empty receiving station, e.g. 151 is aligned with the magnet 115.
  • a locking bar 120 en gages into a notch 121 and the annular frame is blocked by hand on the stub 112.
  • An impulse is applied to the cylinder 114 causing the magnet 115 to be displaced to wards the unit 131.
  • An impulse is now applied to the cylinder 122 whereby the locking bar 120 is extracted from the notch 121 and simultaneously an impulse is applied to a motor II (working cylinder with cam plate) which rotates through a pulley 123 the shaft 111 and with it also the annular frame 109. This rotational movement is again stopped when the locking bar 120 enters into the next notch 121. Then the unit 152 is transferred from the annular frame 109 into the tool carrier 101.
  • a motor II working cylinder with cam plate
  • An impulse is applied to the cylinder 124 causing the locking bar 118 to be removed from its notch 119.
  • the unit 151 is inserted by hand into the free receiving station of the tool carrier 101 and the housing 113 is closed.
  • the inserts 131 to 142 are lifted off the annular frame, the knives 103 are ground adjusted in the knife holders 105 and tightened., Then the inserts 132 to 142 are fitted into the annular frame and the same is prepared for the next knife change.
  • cylinders may be provided instead of one whereby the stepping frequency for the tool carrier 101, the annular frame 109 etc. can be reduced.
  • a device for automatically replacing the knife units in a rotatable carrier of a woodcutting machine comprising a frame having a plurality of receiving stations one of which is empty while the remainder are adapted for containing replacement knife units, means for moving the frame and carrier relative to one another between index positions in which the receiving stations in the frame are brought into successive registration with the knife units in the carrier, and means for both removing individual knife units from the carrier one at a time and placing the same into the frame and for removing individual replacement knife units from the frame and placing them into the carrier.
  • a device as claimed in claim 1, wherein the frame having the receiving stations comprises an annular frame arranged concentrically and rotatably in front of the tool carrier.
  • a device as claimed in claim 1 wherein said said frame is supported for slidable displacement at a location adjacent the carrier such that said stations can be brought into registry with the knife units by rotation of the carrier and displacement of the frame.
  • a device as claimed in claim 1 wherein said frame is mounted for rotation adjacent the carrier, said stations being in an annular arrangement corresponding to the arrangement of the knife units on the carrier such that said stations can be brought into registry with the knife units by relative rotation of the carrier and frame.
  • a device as claimed in claim 1 wherein said means for removing the knife units and the replacement knife units comprises a plate magnet having extended and retracted positions, said plate magnet being mounted adjacent said frame and carrier for passing through the re
  • said carrier includes means displaceably supporting the knife units therein.
  • said carrier includes means resiliently and detachably supporting the knife units therein, comprising a spring-loaded displaceable locking mechanism including an actuating locking bar, said carrier having a groove in the periphery thereof for accommodating the knife units, the latter units being locked in the carrier and being unlocked upon displacement of the locking bar.
  • a woodcutting machine having a rotatable carrier with replaceable knife units: means for replacing the knife units with replacement units, said means comprising a frame having a plurality of receiving stations adapted for containing replacement knife units, means for moving the frame and carrier relative to one another between index positions in which the receiving stations are brought into successive registration wtih the knife units in the carrier, and means for removing successive knife units one at a time from the carrier and transferring them to the frame and alternately replacing the knife units with replacement units from the frame.
  • the last said means comprises a displaceable plate magnet having extended and retracted positions, said frame and carrier being disposed adjacent to one another, the plate magnet being supported adjacent the frame for passing through an empty receiving station and engaging a knife unit to be replaced for moving such knife unit into the empty receiving station for being supported therein, said plate magnet being movable from the retracted to the extended position for engaging a replacement knife unit in the frame and transferring such unit to the carrier for being supported therein in the vacant space left by a previously removed knife unit.
  • a method of replacing removable knife units on a rotatable carrier of a woodcutting machine comprising detachably connecting replacement knife units in receiving stations in a frame, moving the frame and carrier relative to one another between index positions to successively align the receiving stations one at a time with the units in the carrier, and successively moving one knife unit from the carrier to the frame and then replacing the knife unit with a replacement unit in the carrier.
  • a method as claimed in claim 11 wherein the first receiving station is empty, and is initially placed in registry with a knife unit which is to be replaced after which the latter unit is removed from the carrier and placed in the empty receiving station, the carrier and frame then being rotated to successive index positions in which the replacement knife units are placed in the carrier and the knife units in the carrier are placed in the frame in alternation.

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  • 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)
  • Debarking, Splitting, And Disintegration Of Timber (AREA)
US463306A 1964-06-13 1965-06-11 Apparatus and methods for replacing the knife units of a woodcutting machine Expired - Lifetime US3309765A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEK53219A DE1205261B (de) 1964-06-13 1964-06-13 Einrichtung zum automatischen Messerwechsel fuer Holzzerspanungsmaschinen

Publications (1)

Publication Number Publication Date
US3309765A true US3309765A (en) 1967-03-21

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US463306A Expired - Lifetime US3309765A (en) 1964-06-13 1965-06-11 Apparatus and methods for replacing the knife units of a woodcutting machine

Country Status (8)

Country Link
US (1) US3309765A (de)
AT (1) AT268633B (de)
CH (1) CH443643A (de)
DE (1) DE1205261B (de)
FI (1) FI44949C (de)
FR (1) FR1442651A (de)
GB (1) GB1093005A (de)
SE (1) SE316601B (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3368265A (en) * 1966-01-12 1968-02-13 Gen Electric Means for automatically indexing and replacing cutter inserts
US3475807A (en) * 1966-12-19 1969-11-04 Bethlehem Steel Corp Convertible machine unit and method of converting same
US3590463A (en) * 1969-03-03 1971-07-06 R K Lebond Machine Tool Co The Tool changing method
US3678562A (en) * 1969-11-03 1972-07-25 Trumpf & Co Method and device for exchanging tools on machines having reciprocating movement
US3965563A (en) * 1975-05-08 1976-06-29 Ppg Industries, Inc. Method and apparatus for removing cutting blades from an annular cutting head
DE3136413A1 (de) * 1981-09-14 1983-03-31 Burkhardt & Weber GmbH & Co KG, 7410 Reutlingen "werkzeugmaschine zum spanabhebenden bearbeiten eines werkstuecks"

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3309517C1 (de) * 1983-03-17 1984-03-22 Inter-Wood-Maschinen GmbH & Co KG, 8923 Lechbruck Verfahren zur Herstellung von Flachspaenen sowie Vorrichtung zur Durchfuehrung des Verfahrens
US4865094A (en) * 1988-10-24 1989-09-12 Cae Machinery Ltd. Long log waferizer

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2540836A (en) * 1947-06-07 1951-02-06 E P Lawson Co Inc Knife changing device
US3183585A (en) * 1962-12-31 1965-05-18 William A West Method for replacing bushings

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2540836A (en) * 1947-06-07 1951-02-06 E P Lawson Co Inc Knife changing device
US3183585A (en) * 1962-12-31 1965-05-18 William A West Method for replacing bushings

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3368265A (en) * 1966-01-12 1968-02-13 Gen Electric Means for automatically indexing and replacing cutter inserts
US3475807A (en) * 1966-12-19 1969-11-04 Bethlehem Steel Corp Convertible machine unit and method of converting same
US3590463A (en) * 1969-03-03 1971-07-06 R K Lebond Machine Tool Co The Tool changing method
US3678562A (en) * 1969-11-03 1972-07-25 Trumpf & Co Method and device for exchanging tools on machines having reciprocating movement
US3965563A (en) * 1975-05-08 1976-06-29 Ppg Industries, Inc. Method and apparatus for removing cutting blades from an annular cutting head
DE3136413A1 (de) * 1981-09-14 1983-03-31 Burkhardt & Weber GmbH & Co KG, 7410 Reutlingen "werkzeugmaschine zum spanabhebenden bearbeiten eines werkstuecks"

Also Published As

Publication number Publication date
SE316601B (de) 1969-10-27
DE1205261B (de) 1965-11-18
CH443643A (de) 1967-09-15
FI44949C (fi) 1972-02-10
FR1442651A (fr) 1966-06-17
AT268633B (de) 1969-02-25
GB1093005A (en) 1967-11-29
FI44949B (de) 1971-11-01

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