US3523564A - Means for mounting debarking tools on an annular debarking rotor - Google Patents

Means for mounting debarking tools on an annular debarking rotor Download PDF

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Publication number
US3523564A
US3523564A US703387A US3523564DA US3523564A US 3523564 A US3523564 A US 3523564A US 703387 A US703387 A US 703387A US 3523564D A US3523564D A US 3523564DA US 3523564 A US3523564 A US 3523564A
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US
United States
Prior art keywords
rotor
debarking
piston
tools
annular
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
US703387A
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English (en)
Inventor
Karl-Erik A Jonsson
August Matlik
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Brundell and Jonsson AB
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Brundell and Jonsson AB
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Publication date
Application filed by Brundell and Jonsson AB filed Critical Brundell and Jonsson AB
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Publication of US3523564A publication Critical patent/US3523564A/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
    • B27L1/00—Debarking or removing vestiges of branches from trees or logs; Machines therefor
    • B27L1/04—Debarking or removing vestiges of branches from trees or logs; Machines therefor by rubbing the trunks in rotating drums
    • B27L1/05—Drums therefor

Definitions

  • the improvement comprises mounting said rotor on a rotatable shaft which is a piston provided with a helical thread which coacts with a corresponding thread on the inside ofa cylinder surrounding the piston.
  • a resilient force striving to screw the piston in such direction that the tool is rotated onto the axis of the rotor while moving simultaneously axially oppositely to .the intended direction ofinfeed ofa log.
  • the invention relates to means for mounting a debarking tool on an annular debarking rotor.
  • such means comprise a rotatable shaft carried by the rotor in parallel to the axis of the rotor and actuated by a resilient torsional force in such direction that the tool'is caused to engage the surface of a log passing through the rotor.
  • a plurality of tools are mounted in spaced relationship on the rotor.
  • thetool carrying shaft comprises a piston provided with at least one helical thread arranged to coact with a corresponding thread on the inside of a cylinder surrounding the piston. Further, one end of the piston is acted upon by a resilient force striving to screw the piston in such direction that the tool is rotated inwardly to the axis of the rotor while moving simultaneously axially oppositely to the intended direction of infeed of a log.
  • coacting threads must have a pitch which permits the piston to be screwed when influenced by a reasonable axial force.
  • the resilient force acting upon the piston is obtained'from a pressure accumulator which transfers a resilient pressure to a quantity of oil filling a cylinder room at the inner end of the piston.
  • a pressure accumulator which transfers a resilient pressure to a quantity of oil filling a cylinder room at the inner end of the piston.
  • Devices of this kind have been shown in FIGURES 3 and 3a of the US. patent No. 3, 196, 912, for instance.
  • a certain advantage of this embodiment is that the bearing surfaces of the rotatable parts will be effectively lubricated by the pressurized oil.
  • the piston may be provided with common screw thread, in which case the cylinder is threaded as a nut, but in a preferred embodiment both members contain thread grooves together accommodating balls as in a screw ball bearing known per se. In this way, the rotation of the tool is considerably facilitated.
  • FIGURE 1 shows diagrammatically a debarking seen from the infeed end
  • FIGURE 2 shows an axial section of an embodiment of the mounting means according to the invention.
  • the annular rotor 4 in FIG. 1 is journalled in a surrounding stator 3. At its inlet end the rotor 4 carries three blade-shaped debarking tools 5 evenly spaced around the circumference.
  • the tools 5 are pivotable in a plane perpendicular to the axis of the rotor, and their debarking edges are parallel to the axis of the rotor. In the initial position shown, the tools are directed almost radially inwards so that the debarking edges 6 are located at a slight distance only from each other.
  • I is adapted to be rotated in anti-clockwise direction and the tools 5 must thus be mounted to pivot anticlockwise against the action of resilient forces so that they can climb onto a log advanced axially towards the rotor.
  • the tools To facilitate the climbing or self-opening action,.it is customary that the tools have lateral edges 7 projecting a little axially to engage the end surface of the log.
  • each tool 5 is mounted in a holder 8 secured to the outer end of a piston 10 which protrudes from a cylinder 9.
  • the cylinder is composed of a cylindrical member 11, an annular end cap 12 surrounding the piston 10 and a rear end cap 14 connected to a conduit 15 for supply of pressure fluid.
  • a lip seal ring I3 surrounds the piston 10 in the cap 12.
  • the piston Within the cylinder 11 the piston has a portion 16 with a somewhat larger diameter though smaller than the inner diameter of the surrounding cylinder wall so that an annular space 17 is formed.
  • the rear end of the piston has a widened head 18 which is movable with clearance in a chamber 19 defined by the rear end cap 14. In its foremost limit position the head 18 rests against an annular shoulder 20 provided in the cylinder 11.
  • the central portion 16 of the piston is formed with a thread groove 21 semicircular in cross section, and a corresponding thread groove facing the groove 21 is formed in the inner surface of the cylinder 11.
  • a number of balls 23 engaging both grooves 21,22 are kept spaced around the circumference by means of a ball holding sleeve 24 inserted in the annular space 17 and provided with a hole for each ball.
  • the thread pitch must of course be reversed, if the rotor shown in FIG. I is to rotate clockwise instead.
  • a different embodiment is also required, if the tools are instead mounted at the outlet end of the rotor, in which case they are moved away from the rotor by a log advanced, but basically the function remains the same.
  • the piston 10 may be provided with two or more parallel threads cooperating with corresponding threads in the wall of the cylinder 9.
  • a log debarking machine having an annular debarking rotor through which logs are to be moved axially, said rotor containing at least one leg debarking tool extending radially inwardly, the improvement being means for mounting said debarking tool, said means comprising;
  • a cylinder carried by the rotor with its axisparallel to the axis of the rotor, said cylinder having a piston movably positioned therein and protruding from one end thereof;

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Gripping On Spindles (AREA)
  • Debarking, Splitting, And Disintegration Of Timber (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
US703387A 1967-02-17 1968-02-06 Means for mounting debarking tools on an annular debarking rotor Expired - Lifetime US3523564A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE222967 1967-02-17

Publications (1)

Publication Number Publication Date
US3523564A true US3523564A (en) 1970-08-11

Family

ID=20259588

Family Applications (1)

Application Number Title Priority Date Filing Date
US703387A Expired - Lifetime US3523564A (en) 1967-02-17 1968-02-06 Means for mounting debarking tools on an annular debarking rotor

Country Status (6)

Country Link
US (1) US3523564A (enrdf_load_stackoverflow)
JP (1) JPS4841987B1 (enrdf_load_stackoverflow)
DE (1) DE1653065A1 (enrdf_load_stackoverflow)
FI (1) FI42623C (enrdf_load_stackoverflow)
FR (1) FR1552718A (enrdf_load_stackoverflow)
NO (1) NO117943B (enrdf_load_stackoverflow)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3631765A (en) * 1969-02-15 1972-01-04 Otto Neumeister Single-stage and multistage hydraulic cylinders, with protection against twisting
US4196654A (en) * 1978-02-13 1980-04-08 Stearns Frank A Pressure operated valve actuator
US4444068A (en) * 1982-01-26 1984-04-24 Excelermatic Inc. Infinitely variable traction roller transmission
US4585042A (en) * 1982-09-30 1986-04-29 Hutson James Henry Log debarker
WO2005026543A1 (de) * 2003-09-11 2005-03-24 Siemens Aktiengesellschaft Kolbenpumpe und verwendung einer kolbenpumpe

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57137802U (enrdf_load_stackoverflow) * 1981-02-23 1982-08-28
JPS6030803A (ja) * 1983-07-28 1985-02-16 Shimadzu Corp 油圧駆動装置のクロスブリ−ド回路
JPS60178602U (ja) * 1984-05-08 1985-11-27 日立建機株式会社 油圧機械の油圧回路

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3631765A (en) * 1969-02-15 1972-01-04 Otto Neumeister Single-stage and multistage hydraulic cylinders, with protection against twisting
US4196654A (en) * 1978-02-13 1980-04-08 Stearns Frank A Pressure operated valve actuator
US4444068A (en) * 1982-01-26 1984-04-24 Excelermatic Inc. Infinitely variable traction roller transmission
US4585042A (en) * 1982-09-30 1986-04-29 Hutson James Henry Log debarker
WO2005026543A1 (de) * 2003-09-11 2005-03-24 Siemens Aktiengesellschaft Kolbenpumpe und verwendung einer kolbenpumpe
US20070025867A1 (en) * 2003-09-11 2007-02-01 Johannes Deichmann Reciprocating pump and use of said reciprocating pump
CN100564872C (zh) * 2003-09-11 2009-12-02 西门子公司 往复式泵以及往复式泵的应用

Also Published As

Publication number Publication date
FI42623C (fi) 1970-09-14
FR1552718A (enrdf_load_stackoverflow) 1969-01-03
DE1653065A1 (de) 1972-02-10
NO117943B (enrdf_load_stackoverflow) 1969-10-13
JPS4841987B1 (enrdf_load_stackoverflow) 1973-12-10
FI42623B (enrdf_load_stackoverflow) 1970-06-01

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