EP2266767A1 - Maschine zum Schneiden von Baumstämmen - Google Patents

Maschine zum Schneiden von Baumstämmen Download PDF

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Publication number
EP2266767A1
EP2266767A1 EP10167316A EP10167316A EP2266767A1 EP 2266767 A1 EP2266767 A1 EP 2266767A1 EP 10167316 A EP10167316 A EP 10167316A EP 10167316 A EP10167316 A EP 10167316A EP 2266767 A1 EP2266767 A1 EP 2266767A1
Authority
EP
European Patent Office
Prior art keywords
trunk
receded
swinging structure
sawing machine
displacement
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.)
Withdrawn
Application number
EP10167316A
Other languages
English (en)
French (fr)
Inventor
Andrea Ricca
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.)
Ricca Andrea and C SNC
Original Assignee
Ricca Andrea and C SNC
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 Ricca Andrea and C SNC filed Critical Ricca Andrea and C SNC
Publication of EP2266767A1 publication Critical patent/EP2266767A1/de
Withdrawn legal-status Critical Current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
    • B27B—SAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR
    • B27B5/00—Sawing machines working with circular or cylindrical saw blades; Components or equipment therefor
    • B27B5/16—Saw benches
    • B27B5/22—Saw benches with non-feedable circular saw blade
    • B27B5/224—Saw benches with non-feedable circular saw blade the workpieces being fitted on a pivoting support
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27G—ACCESSORY MACHINES OR APPARATUS FOR WORKING WOOD OR SIMILAR MATERIALS; TOOLS FOR WORKING WOOD OR SIMILAR MATERIALS; SAFETY DEVICES FOR WOOD WORKING MACHINES OR TOOLS
    • B27G19/00—Safety guards or devices specially adapted for wood saws; Auxiliary devices facilitating proper operation of wood saws
    • B27G19/02—Safety guards or devices specially adapted for wood saws; Auxiliary devices facilitating proper operation of wood saws for circular saws

Definitions

  • the present invention refers to trunk sawing machines with rotary saw disk and swinging structure (or vat) of the trunk to be cut.
  • trunk sawing machines thus made comprising a cover of the saw disc moveable between an advanced condition in which it encloses the saw disc and a receded condition, a feeding carriage of the trunk displaceable along a guide arranged at right angles relative to the saw disc, and a swinging structure for supporting the guide operatively connected to the cover and movable relative to the saw disc from a receded inoperative position, in which the cover is located in the advanced condition, towards a cutting advanced position in which the trunk positioned on the feeding carriage is progressively moved against the saw disc, while the cover is located in the receded condition, to be severed into successive pieces having a length corresponding to the amount of displacement of the carriage along the guide.
  • servo-actuator means to displace the swinging structure between the receded and advanced positions, and manually-operable control means of the servo-actuator means.
  • a machine of this type is also known from US-1566191 .
  • trunk sawing machines During use, these trunk sawing machines often expose the operator to risks related accidents, most of which occur during the final step of the operation when, lack of attention or so as to accelerate the times of execution, the operator tends to push the residual part of the trunk previously cut into pieces out of the machine, without waiting for the complete return of the swinging structure to the inoperative receded position, i.e. before the saw disc is entirely enclosed in the cover correspondingly moved towards the advanced condition. In such event, statistically the operator is exposed to much higher risks of injuring the hand thereof.
  • the object of the present invention is that of overcoming the abovementioned drawback, and providing an improvement for trunk sawing machines thus made hence allowing drastically reducing, and even eliminating, the exposure of the operator to risks of accidents in the situations described beforehand.
  • the trunk sawing machine further comprises a safety device to inhibit the discharge of the residual portion of the trunk resulting from cutting the last piece or other residual portions from said carriage until the swinging structure is brought to the receded condition.
  • the safety device comprises a tiltable stop member located immediately downstream of the saw disc with respect to the displacement path of the trunk and moveable between an inoperative position, in which it does not obstruct such path, and a stop position in which it instead intercepts such path.
  • the inoperative position of the tiltable stop member corresponds both to the inoperative receded position of the swinging structure, and the step of cutting the trunk by the saw disc, and the displacement of the tiltable stop member to the stop position is borne out, under the action of the return means, at the end of the step for cutting the trunk.
  • the tiltable stop member for example made up of a shaped bar pivoted around a stationary axis of the machine or around a moveable axis with the cover of the saw disc - automatically disappears from the working zone only when the saw disc is enclosed in the cover, i.e. in the step in which the swinging structure is completely receded, in such a manner to allow the operator to safely remove the residual piece of the trunk already cut, or positioning a new trunk to be cut, or other operations, without exposing the operator to the risk of inadvertently intercepting the saw disc.
  • the tiltable stop member does not cause any hindrance during the cutting step, in that it is held, by the same trunk, outside its displacement path until the cutting operation is completed. In such situation, the tiltable stop member is thus capable of rotating rapidly in the stop position thereof, in such a manner to prevent the operator from performing the operation of discharging the residual piece of trunk before the saw disc is entirely enclosed in the cover thereof.
  • the safety device according to the invention is extremely simple and inexpensive, practically it does not require maintenance, it does not create any type of hindrance or obstacle during the operating cycle, and it does not require any adjustment. Furthermore, obviously alongside hindering reckless and hazardous actions that could expose the operator to serious accidents, it does not give rise to longer operating cycle times.
  • the manually-operable control means of the servo-actuator means that provide for the displacement of the swinging structure comprise a single lever positively operated to provide both the displacement of the swinging structure from the receded position to the advanced position and rapid return thereof to the receded position and then stop thereof in such position.
  • the positioning is such that releasing the positive operation of the lever provides return, conveniently at a low speed, of the swinging structure to the receded position.
  • Such characteristic facilitates the cutting and return control of the swinging structure, alongside quickening it in that the operator is not required to check or decide whether the cutting operation has been completed or not before proceeding to reverse the control, but the operator simply operates the same lever in the same manner.
  • the entire cutting and return cycle whose speed may be selectively adjusted, occurs naturally and rapidly, but forcing the operator to constantly operate the lever manually. Even this constant operation of the lever, typically performed using the right hand, allows not exposing the operator to risks of accidents.
  • the automatic cutting and return step in a single sequence may however be interrupted or reversed at any time, by simply releasing the lever: in such case, the swinging structure shall automatically return to the receded position, but - as mentioned - more slowly with respect to the automatic cycle. This slower return makes the machine safer, in case the cutting step requires to be interrupted due to occurrence of unexpected problems. In such case, the saw disc shall slip off from the cavity of the cut already performed in the trunk in an easy manner and without causing problems related to hazardous jamming or seizure.
  • the system is safe even without being associated to hydraulic control, but simply using a traditional manual control of the swinging structure.
  • FIGS 1 and 2 schematically illustrate a trunk sawing machine according to the invention in two different operating conditions outlined hereinafter.
  • the machine is of the generally conventional type and thus only the essential components thereof as well as those expressly referring to the invention shall be described.
  • the trunk sawing machine comprises a framework 1 having wheels 2 rotating at whose upper part, around a horizontal axis, is a saw disc 3 rotated by a motorised unit 4.
  • Indicated with 5 is an overturnable horizontal guide arranged transverse with respect to the saw disc 3 and moveable along which is a feeding carriage 6 of the trunk to be cut, indicated with T in figures 3 to 5 and 8 to 10 .
  • the guide 5 is borne by a swinging structure generally indicated with 7, which is pivoted to the framework 1 around an axis 35 and is movable relative to the saw disc 3, together with the guide 5, between the completely receded inoperative position illustrated in figure 1 , and the completely advanced position illustrated in figure 2 , to move the trunk T fed through the carriage 6 progressively against the saw disc 3, thus executing the cutting in successive pieces having a length corresponding to the amount of displacement of the carriage 6 along the guide 5.
  • Such displacement is usually performed by pushing manually.
  • the swinging structure 7 also bears a cover 8 of the saw disc 3, provided with a slit 9 suitable to be passed through by such saw disc 3 when the swinging structure 7 is moved from the receded position towards the advanced position.
  • a cover 8 of the saw disc 3 provided with a slit 9 suitable to be passed through by such saw disc 3 when the swinging structure 7 is moved from the receded position towards the advanced position.
  • the saw disc 3 In the receded position, the saw disc 3 is completely enclosed in the cover 8, while during the displacement of the swinging structure 7 towards the advanced position, such cover 8 is progressively positioned at a receded position in which the saw disc 3 is exposed for progressively cutting the trunk T.
  • the displacement of the swinging structure 7 is performed by means of a double effect hydraulic jack 10 whose drive circuit is schematized in figure 15 .
  • a hydraulic pump 11 provides pressurised oil to one or the other chamber of the jack 10 through the a four-position distributor valve 12 (or even possibly just a three- position distributor valve) actuated by a tiltable control level 13 borne, at an easily manoeuvrable position, by the swinging structure 7.
  • the cutting speed i.e. the contraction of the hydraulic jack 10 to move the swinging structure 7 from the receded position to the advanced position is adjustable by means of a control knob 36 inserted into the hydraulic control circuit of the jack 10.
  • Indicated with 14 is a pipe slidingly borne by the swinging structure 7 and inserted in which is a bar 19.
  • the pipe 14 and the bar 19 define a double sliding system associated to which is a telescopic strut 16 and a flexible tie 17, outlined further hereinafter expressly referring to figures 11 to 14 .
  • double sliding system 14, 19 actuates a moveable stop member 15 operatively associated to the control lever 13.
  • the machine operates in a generally conventional manner: the trunks T to be cut are positioned one by one on the carriage 6, which is moved until the end of the trunk is positioned against a stop member indicated with 18 in figures 1 and 2 .
  • the cutting cycle is actuated by operating the lever 13, through the methods further specified in detail hereinafter, in such a manner to displace the swinging structure 7, through the hydraulic jack 10, from the receded position of figure 1 in which the cover 8 completely encloses the saw disc 3 as represented in figure 1 , towards the completely advanced position represented in figure 2 . Due to such displacement, the cover 8 progressively uncovers the saw disc 3 through the slit 9, while the trunk T arranged on the carriage 6 is cut producing a piece which is thus discharged from the machine.
  • the swinging structure 7 is thus returned to the initial receded position to allow the cutting of a further piece of the trunk T.
  • the invention provides for - according to a first aspect - a safety device having the function of preventing the discharge of the residual trunk T resulting from the last piece or other residual pieces from the carriage 6 until the swinging structure 7 completely returns to the receded position.
  • such safety device is indicated with 20 in figures 3 to 6 : it consists in a simple shaped bar borne by a tiltable lever 21 which, as illustrated more in detail in figure 7 is pivoted to a pin 23 rotatingly supported by the structure 22 fixed to the framework of the machine 1 bearing, on the side opposite to the lever 21, an arm 23 countered by a fixed stop member 24 and serving as a reaction element for a torsion spring 25 which is wound on the pin 23 and serves as an elastic element for pushing the safety bar 20.
  • the safety device represented by the bar 20 operates as follows.
  • the bar 20 is kept - due to the abutment of the free end thereof against the swinging structure 7 - at the position represented in figure 3 , in which it does not obstruct the displacement path of the trunk T, hence allowing translation thereof along the guide 5 until the cutting position is reached.
  • the trunk T is moved against the saw disc 3 progressively uncovered by the cover 8, hence causing the further rotation of the bar 20, against the action of the spring 25, as represented in figure 4 .
  • the spring 25 returns such bar 20 to abut against the swinging structure 7, as illustrated in figure 5 .
  • the bar 20 is brought to obstruct the displacement path of the residual trunk T positioned on the carriage 6, thus hindering any displacement attempt towards the stop member 18 until the swinging structure 7 is returned to the completely receded position corresponding to which - as mentioned - is the advanced condition of the cover 8, in which the saw disc 3 is completely enclosed therein ( figure 3 ).
  • the swinging structure 7 bears the sliding pipe 14 moveable within which is the bar 19, defining the double sliding system.
  • the bar 19 positively rotates the stop member 15 between the positions illustrated respectively with a continuous line and with a dashed line in figure 11 .
  • pivoted to the bar 19 in 32 is an end of a telescopic strut 16, whose opposite end is pivoted in 31 to the framework 1 of the machine.
  • a spring 30 associated to the lower end of the bar 19 tends to return such bar 19 downwards.
  • Adjustably anchored in 33 near the joint 31 is an end of the flexible tie 17 whose opposite end is anchored in 34 to the pipe 14.
  • the pipe 14 is joined, through a second flexible cable - not illustrated - to the control lever 13.
  • the positioning is such to attain the return of the swinging structure 7 from the advanced position to the receded position at two different speeds: rapid return and slow return.
  • rapid return and slow return By actuating the control lever 13 to control the displacement of the tiltable structure 7 from the receded position to the advanced position and then continuing to actuate such lever 13 after the cutting of the trunk T, there occurs the rapid return to the receded position of the tiltable structure 7 without interruption.
  • the operator shall release the control lever 13 and reposition the trunk to be cut against the stop member 18 and repeat the cutting and return operation.
  • the automatic cutting and return operation in a single sequence may however be interrupted and reversed at any time, by simply releasing the control lever 13: in this case, the swinging structure 7 shall return towards la receded position in a slower manner.
  • control lever 13 is suitable to acquire - starting from a neutral position indicated with “0” in figure 12 - three different control angular positions, respectively indicated with “1” still in figure 12 and with “2" and “3” in figure 14 .
  • the operator by moving the control lever 13 from position "0" to position "2", controls the contraction of the jack 10 and thus the displacement of the swinging structure 7 towards the advanced position of figure 13 , performing the cutting of the trunk T.
  • the operator has two options for the return step: by holding the control lever at position "2" the swinging structure 7 is held in the advanced position, while by releasing such lever 13 the swinging structure 7 slowly returns towards the receded position. In such case, the downwards sliding of the pipe 14 along the bar 19 automatically returns the control lever 13 to position "0", stopping the swinging structure 7 at the receded position.
  • control lever 13 should the control lever 13 be actuated with greater force during the final step of the displacement of the structure towards the advanced position, it may be positioned at position "3", due to the upwards axial movement with respect to the stop member 15 from the position indicated with “A” to the position indicated with “C” in figure 11 , operated by the bar 19 pushed upwards by the strut 16 after the displacement of the swinging structure 7 to the advanced position.
  • the extension of the jack 10 rapidly returns the swinging structure 7 to the receded position.
  • releasing the control lever 13 automatically determines the displacement thereof to position "0".
  • Position "0" of the control lever 13 is attained at this step also due to the rotation of the stop member 15 from position “A” to position "C", facilitated by the axial downwards sliding downwards with respect to the bar 19 under the action of the spring 30.
  • This sequence associated to the rotation of the stop member 15, allows the passage of the control lever 13 from position "2" - "3" to position "0".

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Shearing Machines (AREA)
  • Sawing (AREA)
EP10167316A 2009-06-26 2010-06-25 Maschine zum Schneiden von Baumstämmen Withdrawn EP2266767A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITTO2009A000490A IT1398988B1 (it) 2009-06-26 2009-06-26 "macchina taglia-tronchi"

Publications (1)

Publication Number Publication Date
EP2266767A1 true EP2266767A1 (de) 2010-12-29

Family

ID=41594883

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10167316A Withdrawn EP2266767A1 (de) 2009-06-26 2010-06-25 Maschine zum Schneiden von Baumstämmen

Country Status (2)

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EP (1) EP2266767A1 (de)
IT (1) IT1398988B1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT16565U1 (de) * 2018-12-28 2020-01-15 Lettner Josef Wippkreissäge
EP3623125A1 (de) 2018-09-17 2020-03-18 Ricca Andrea & C. S.n.c. Baumstammsägevorrichtung

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE390631C (de) * 1922-04-02 1924-02-22 Daniel Speck Zwanglaeufig durch die Materialauflage gesteuerte Schutzvorrichtung fuer Kreissaegemaschinen
US1566191A (en) 1923-11-08 1925-12-15 Fleischel Marie Charles Gaston Sawing machine
FR903812A (fr) * 1944-04-27 1945-10-18 Machine à tronconner les bois
AU2562684A (en) * 1983-10-20 1985-04-26 Richard Gieselmann Trailer mounted saw bench
EP1992461A1 (de) * 2007-05-15 2008-11-19 Posch Gesellschaft m.b.H. Wippsägevorichtung

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE390631C (de) * 1922-04-02 1924-02-22 Daniel Speck Zwanglaeufig durch die Materialauflage gesteuerte Schutzvorrichtung fuer Kreissaegemaschinen
US1566191A (en) 1923-11-08 1925-12-15 Fleischel Marie Charles Gaston Sawing machine
FR903812A (fr) * 1944-04-27 1945-10-18 Machine à tronconner les bois
AU2562684A (en) * 1983-10-20 1985-04-26 Richard Gieselmann Trailer mounted saw bench
EP1992461A1 (de) * 2007-05-15 2008-11-19 Posch Gesellschaft m.b.H. Wippsägevorichtung

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3623125A1 (de) 2018-09-17 2020-03-18 Ricca Andrea & C. S.n.c. Baumstammsägevorrichtung
AT16565U1 (de) * 2018-12-28 2020-01-15 Lettner Josef Wippkreissäge

Also Published As

Publication number Publication date
IT1398988B1 (it) 2013-03-28
ITTO20090490A1 (it) 2010-12-27

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