US3858631A - Device for centering of timber blocks and the like - Google Patents

Device for centering of timber blocks and the like Download PDF

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Publication number
US3858631A
US3858631A US399495A US39949573A US3858631A US 3858631 A US3858631 A US 3858631A US 399495 A US399495 A US 399495A US 39949573 A US39949573 A US 39949573A US 3858631 A US3858631 A US 3858631A
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US
United States
Prior art keywords
screw
nut
centering
spring
centering means
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Expired - Lifetime
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US399495A
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English (en)
Inventor
Per Lief Andersson
Rune Sigfrid Lind
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SKOGSAGAREFORENINGEN MELLANSKOG UPA
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SKOGSAGAREFORENINGEN MELLANSKOG UPA
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27B—SAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR
    • B27B31/00—Arrangements for conveying, loading, turning, adjusting, or discharging the log or timber, specially designed for saw mills or sawing machines
    • B27B31/06—Adjusting equipment, e.g. using optical projection
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27B—SAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR
    • B27B1/00—Methods for subdividing trunks or logs essentially involving sawing
    • B27B1/007—Methods for subdividing trunks or logs essentially involving sawing taking into account geometric properties of the trunks or logs to be sawn, e.g. curvature

Definitions

  • ABSTRACT A device for centering timber blocks or the like when being fed into sawing machines, in which centering means, swingably disposed for working on opposite sides of the blocks, are so coupled that they move from a normal position outwards from each other or inwards towards each other an equal distance, coupling of the centering device being achieved by means of one or more chains, bands or the like which run in opposite directions over chain wheels or the like attached to the centering means, and a spring device which determines the normal position if coupled with at least one of the centering means.
  • the spring device consists of a screw and a nut working in conjunction with it as well as a spring mounted on the screw between the nut and a stop, which screw is given more or less tension by turning of the nut.
  • the screw is connected to an arm mounted on the centering means, through a nut, which is penetrated by the screw.
  • the screw is to be turned in relation to the nut in order to set the starting position of the centering means,
  • FIG. 3 17b DEVICE FOR CENTERING OF TIMBER BLOCKS AND THE LIKE
  • the invention relates to a device for centering of timber blocks and the like during feeding-in to sawing machines in which swingably arranged centering means, to work on opposite sides of the block, are coupled so that from a starting position (normal position) they move outwards from each other or inwards towards each other an equal distance.
  • the linking up of the centering means is achieved by means of one or more chains, bands or the like which run in opposite directions over chain wheels or the like attached to the centering means, and a spring device, which determines the normal position, is attached to at least one of the centering means.
  • the purpose of the invention is to achieve a simple and operationally dependable construction of a device of said type which also makes simple adjustment of the normal position for the centering means possible.
  • the invention is mainly characterized in that the spring device consists of a screw and a nut working in conjunction with it as well as a spring disposed on the screw between the nut and a stop, said spring being tensioned more or less by turning the nut, and that the screw is connected to an arm mounted on the centering means via a nut which is penetrated by the screw, the starting position of the centering means thus being adjusted by turning of the screw in relation to the nut.
  • a precision centering device is of impor' tance for the quality of the sawn lumber, and a centering device according to the invention has been shown to fulfill all the requirements since it holds the block so exactly centered in relation to the sawing machine that the control lines of the sawing machine and the block coincide along the whole length of the block. In other words the block will be cut exactly along the pith line of the log or trunk if the centering device is set for this purpose. It has been shown that this means an increase in the average length of the sawn product thereby improving the volume yield at the same time as the amount of wood, which normally goes to a chipper, is reduced accordingly.
  • FIG. 1 shows a plane view of an automatic aligning device and a frame with a block centering device according to an embodiment of the invention.
  • the rest of the figures show the block centering device in larger scale, specifically, FIG. 2 in a horizontal projection and FIG. 3 in a vertical projection, partially in section.
  • FIG. 4 shows on a still larger scale the spring device partially in axial section.
  • l designates a trunk or a block which comes to the device after it has been trimmed on two opposite sides in a cant gang saw.
  • the block comes in on a longitudinal conveyor belt 2 and is first stopped by a stop 3 at an appropriate side position directly in front of an automatic aligning device 4 onto whose carrying rollers 5 and feeder rollers 6 the block is moved laterally on a lateral transport device 7.
  • the block 1 is shown on the one hand in that position where it has been stopped by the stop 3, and on the other hand in a position 1', where it is in a block centering device 8 and has partially been fed through a frame 9.
  • the direction of feed is indicated by the arrows 10.
  • ll designates the middle line of the sawing machine with which the center line of the block is to be made to coincide by the operation of the centering device 8.
  • the centering means consist essentially of a pair of cranks with crank arms 15a, 15b and vertical axles 16a, 16b and taps 17a, 17b parallel to them which function as bearings for the rollers 18a, 18b designed to engage with the block which is fed in between them.
  • the axels 16a, 16b are carried in the bearing bracket 12 by means of bearing sleeves 19a, 19b and on their outer ends they bear chain wheels 20a, 20b wedged securely on the same.
  • each axle there are two chain wheels which are mutually connected by means ofa hub shell 21a, 21b but in principle it could be sufficient with one wheel on each axle, espe cially if the chain can be bent laterally or is replaced by a flexible band.
  • a chain 22 runs over both the wheels 20a, 20b and in the same manner a chain 22 runs over both of the other chain wheels.
  • the chains 22, 22 have their ends fastened on the wheels.
  • the chains run in opposite directions over the chain wheels so that they run on the upper side of the chain wheel 20a when they come from the underside of the chain wheel 20b. If the movement is transferred by means of a cable instead of a chain, the cable can be endless.
  • An adjustable cable or chain lock 23 allows for control of the tension.
  • an arm 24 is securely united to which a spring device is attached.
  • Said spring device is designated by 25 in FIG. 2 and is shown in detail in FIG. 4.
  • the spring device consists of a scrrew 26 and a nut 27 working in conjunction with it as well as a spring mounted on the screw between the nut and a stop 28 and threaded on a tube 28 on the screw. Said spring can be given more or less tension by turning the nut 27.
  • the screw 26 goes through and works in conjunction with the nut 31.
  • the screw 26 can be rotated by means of a hand crank 32 or the like mounted at its end.
  • the tube 28' surrounding the screw is displaceably journalled in the wall of the bearing bracket 12 by means of a ball-and-socket joint 33, 34.
  • stop ring 35 for a damper on the ball e.g., in the form of a rubber bushing 36 which sits on a sleeve 37 concentric with the screw and enclosing the same.
  • the hand crank 32 is also attached to the sleeve 37.
  • crank arms 15a, 15b of the centering means are parallel and have been set in this position by adjustment by means of the crank 32 and the screw 26.
  • the centering device 8 is adjusted on the guides 14 so that its middle lies right in front of the middle point of the sawing machine 9.
  • the rollers 18a and 18b are spaced so that the block 1 will be in contact with both of the rollers when it is advanced between them by the feeder rollers 6.
  • roller 18a for example, due to an inward bend in the block 1 is swung to the right in FIG. 2, e.g., to the position indicated with the dash-and-dot lines 18a
  • the roller 18b is swung via the chain transmission inwards to the left in FIG. 2 just as much, i.e., to the position designated with the dash-and-dot lines 18b, so that centering is achieved in this case also.
  • the spring 29, which is assumed to be pretensed the required amount by means of the nut 27, is then allowed to expand by the nut 27 being drawn to the right in FIG. 4 by the screw, the tube 28 following with it and sliding on the ball 33.
  • the stop 28 stays in contact with the ball 33.
  • centering means ineluding assemblies swingably disposed for working on opposite sides of a block, means coupling said assemblies so that they move from a normal position outwards from each other or inwards towards each other an equal distance, said coupling means including at least one endless member running in opposite directions over wheels or the like attached to said assemblies means, and a spring device which determines the normal position coupled with at least one of said assemblies and including a screw and a cooperating nut and a spring mounted on the screw between the nut and a stop so that the screw may be tensioned by turning of the nut, said screw being connected to an arm mounted on said one assembly by a nut which is penetrated by said screw, said screw being turned in relation to the nut in order to set the starting position of the centering means.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Rollers For Roller Conveyors For Transfer (AREA)
  • Transmission Devices (AREA)
  • Chemical And Physical Treatments For Wood And The Like (AREA)
  • Sawing (AREA)
  • Jigs For Machine Tools (AREA)
US399495A 1972-09-25 1973-09-21 Device for centering of timber blocks and the like Expired - Lifetime US3858631A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE12361/72A SE366679B (sv) 1972-09-25 1972-09-25

Publications (1)

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US3858631A true US3858631A (en) 1975-01-07

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ID=20295610

Family Applications (1)

Application Number Title Priority Date Filing Date
US399495A Expired - Lifetime US3858631A (en) 1972-09-25 1973-09-21 Device for centering of timber blocks and the like

Country Status (7)

Country Link
US (1) US3858631A (sv)
FI (1) FI57066C (sv)
NO (1) NO136484C (sv)
PL (1) PL86833B1 (sv)
SE (1) SE366679B (sv)
SU (1) SU532325A3 (sv)
ZA (1) ZA737529B (sv)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4069910A (en) * 1976-04-22 1978-01-24 Faley Arnold F Apparatus and method for center positioning lumber and the like
US4127044A (en) * 1974-07-30 1978-11-28 Alan Kenyon For sawing and for controlling the sawing process
US4136766A (en) * 1976-12-06 1979-01-30 Pryor Roy R Sawmill pull-off assembly module
US4136763A (en) * 1976-12-06 1979-01-30 Pryor Roy R Sawmill stop assembly module
US4144782A (en) * 1976-02-16 1979-03-20 Skogsagarnas Vanerindustrier Aktiebolag Apparatus for curved sawing of timber
US4210184A (en) * 1978-01-30 1980-07-01 Producto Machinery Corporation Circular resaw apparatus and method
US5482098A (en) * 1994-09-01 1996-01-09 Loppnow; Dean A. Feeding device for curved workpieces
US6447386B1 (en) 2000-09-12 2002-09-10 Osi Machinerie Inc. Presser roll for surface planner
US20090271976A1 (en) * 2007-07-19 2009-11-05 Song Huang Device for assembling and disassembling inner support of vehicle tire
US20120227223A1 (en) * 2011-03-07 2012-09-13 Knox Howard T Strap tensioning system
US9061622B2 (en) 2012-09-05 2015-06-23 Ancra International Llc Strap tensioning system

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE413641B (sv) * 1975-02-19 1980-06-16 Skogsegarnas Vaenerind Forfaringssett och anordning for sagning av timmer

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US208323A (en) * 1878-09-24 Improvement in tonguing and grooving machines
US1295875A (en) * 1918-08-26 1919-03-04 Robert D Eaglesfield Feeding mechanism for molding-machines.
US2169394A (en) * 1937-03-15 1939-08-15 Jairus S Richardson Feeding mechanism
US2897859A (en) * 1956-01-04 1959-08-04 Improved Machinery Inc Log-centering barker feeding mechanism
US3120303A (en) * 1961-02-23 1964-02-04 Roy F Leonard Modular conveyor

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US208323A (en) * 1878-09-24 Improvement in tonguing and grooving machines
US1295875A (en) * 1918-08-26 1919-03-04 Robert D Eaglesfield Feeding mechanism for molding-machines.
US2169394A (en) * 1937-03-15 1939-08-15 Jairus S Richardson Feeding mechanism
US2897859A (en) * 1956-01-04 1959-08-04 Improved Machinery Inc Log-centering barker feeding mechanism
US3120303A (en) * 1961-02-23 1964-02-04 Roy F Leonard Modular conveyor

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4127044A (en) * 1974-07-30 1978-11-28 Alan Kenyon For sawing and for controlling the sawing process
US4373563A (en) * 1974-07-30 1983-02-15 Alan Kenyon Sawing of lumber from logs
US4144782A (en) * 1976-02-16 1979-03-20 Skogsagarnas Vanerindustrier Aktiebolag Apparatus for curved sawing of timber
US4069910A (en) * 1976-04-22 1978-01-24 Faley Arnold F Apparatus and method for center positioning lumber and the like
US4136763A (en) * 1976-12-06 1979-01-30 Pryor Roy R Sawmill stop assembly module
US4136766A (en) * 1976-12-06 1979-01-30 Pryor Roy R Sawmill pull-off assembly module
US4210184A (en) * 1978-01-30 1980-07-01 Producto Machinery Corporation Circular resaw apparatus and method
US5482098A (en) * 1994-09-01 1996-01-09 Loppnow; Dean A. Feeding device for curved workpieces
US6447386B1 (en) 2000-09-12 2002-09-10 Osi Machinerie Inc. Presser roll for surface planner
US20090271976A1 (en) * 2007-07-19 2009-11-05 Song Huang Device for assembling and disassembling inner support of vehicle tire
US8387237B2 (en) * 2007-07-19 2013-03-05 Dongfeng Motor Corporation Device for assembling and disassembling inner support of vehicle tire
US20120227223A1 (en) * 2011-03-07 2012-09-13 Knox Howard T Strap tensioning system
US9061622B2 (en) 2012-09-05 2015-06-23 Ancra International Llc Strap tensioning system
CN104781107A (zh) * 2012-09-05 2015-07-15 安科拉国际有限责任公司 束带张紧系统

Also Published As

Publication number Publication date
NO136484B (sv) 1977-06-06
SE366679B (sv) 1974-05-06
NO136484C (no) 1977-09-14
PL86833B1 (sv) 1976-06-30
FI57066B (fi) 1980-02-29
ZA737529B (en) 1974-08-28
FI57066C (fi) 1980-06-10
SU532325A3 (ru) 1976-10-15

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