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
  • B27B5/228—Cross-cutting automatically laterally-fed travelling workpieces; Reducing lumber to desired lengths
• • 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
  • B27B25/00—Feeding devices for timber in saw mills or sawing machines; Feeding devices for trees

Definitions

• the present invention relates to an apparatus for positioning workpieces, such as timber workpieces or profile bars whose length is to be adjusted, and comprises: a feed conveyor by means of which the workpieces are fed with their longitudinal direction substantially at right angles to the direction of feed of the conveyor, transverse displacement devices disposed to displace the workpieces in their longitudinal direction transversely of the direction of feed, and abutment means for arresting the transverse displacement movement of the workpieces, whereby the one end of the workpieces is positioned.
• Positioning apparatuses of the type intimated by way of introduction are previously known in the art. Such positioning apparatuses may be employed for positioning various types of elongate workpieces, such as workpieces of profiled material (for example aluminium and plastics), timber pieces etc.
• workpieces of profiled material for example aluminium and plastics
• timber pieces etc.
• the present invention will be exemplified in one embodiment in which the workpieces are timber pieces.
• the timber workpieces are fed resting on a feed conveyor such that the longitudinal direction of the timber pieces is transversely directed in relation to the direction of feed of the conveyor.
• the timber pieces are displaced in their longitudinal direction by means of rollers whose longitudinal directions are approximately parallel with the direction of feed of the feed conveyor.
• the timber pieces will be displaced transversely of the direction of feed of the feed conveyor.
• an abutment against which the individual workpieces are displaced such that the transversely directed displacement is arrested and thereby the ends of the timber pieces become positioned.
• the abutment is placed in such a manner that it is located at the end regions of the rollers by means of which the timber pieces are transversely displaced.
• the present invention has for its object to design the positioning apparatus described by way of introduction such that it may operate at highly intensified speeds, at the same time as the requirements on precision in the positioning operation may be placed extremely highly.
• the present invention further has for its object to realise an apparatus which is operationally reliable and simple in design and construction. SOLUTION
• the positioning apparatus intimated by way of introduction is characterized in that the abutment means are disposed on a conveyor which runs along and synchronously in the same direction as the feed conveyor.
• the operative length of the transverse displacement device seen in the direction of feed of the feed conveyor, substantially corresponds with the operative length of the conveyor of the abutment means.
• Fig. 1 is a schematic top plan view of the apparatus according to the present invention.
• Fig. 2 shows the apparatus of Fig. 1 seen in the direction of the arrow
• FIG. 3 shows a modified embodiment in a view corresponding to that of Fig. 1;
• Fig. 4 shows the modified embodiment in a view corresponding to that of Fig. 2;
• Fig.5 is a section taken along the section line A-A in Fig.4.
• the present invention may be applied in the positioning of different types of elongate workpieces, such as workpieces of tubular material, profiled material, timber etc.
• the material in the workpieces may also vary.
• the present invention will be described for purposes of exemplification below in connection with the positioning of timber workpieces.
• reference numeral 1 relates to chains, belts or the like which are included in a feed conveyor for the timber pieces 2.
• the chains or belts move in a feed direction according to the arrow 3.
• the chains 1 are supported by means of suitable support members (not shown on the Drawing) and run over wheels or the like (not shown). Further, the chains are provided with drivers 4 which advance the workpieces 2 ahead of them.
• the apparatus according to the present invention further includes transverse displacement devices 5 which are intended for feeding the timber pieces in their longitudinal directions transversely of the direction of feed of the conveyor 1.
• the transverse displacement devices include at least two rollers 6 or the like which are rotary in accordance with the arrows 7 around shafts which are substantially parallel with the feed conveyor 1 and its direction of feed 3.
• the upper surfaces of the rollers 6 are located on a slightly higher vertical level than the upper sides of the feed conveyor 1.
• the rollers 6 will, when they rotate in accordance with the arrows 7, transversely displace the timber pieces 2 in the direction of the arrow 8.
• the timber pieces 2 will be displaced by the feed conveyor 1 in the direction of the arrow 3, the timber pieces sliding on the rollers 6 in their longitudinal direction.
• the shafts of the rollers 6 are aligned such that they deviate somewhat from a parallel state with the direction of feed of the feed conveyor 1 in such a manner that the rollers 6 impart to the timber pieces a movement component in the same direction as the feed direction 3.
• the timber pieces 2 will be somewhat lifted forwards from the drivers 4 or at least the friction against them will be reduced.
• the oblique inclination which is required for achieving such a result implies that the right-hand ends of the rollers 6 in Fig. 1 are to be displaced in an upward direction in the Drawing.
• the apparatus according to the present invention further includes a second conveyor 9 which has chains, belts or the like 10 which run over wheels 16 shown in Fig. 2, with centre axes 11.
• the chains 10 in the conveyor 9 are mutually interconnected via a number of crosspieces 12 which are provided with anchorages for abutment means 13.
• the conveyor 9 displays the same direction of movement as the feed conveyor 1 and runs synchronously with it. Further, its direction of movement is substantially parallel with the direction of movement 3 of the feed conveyor.
• the synchronous movement is further such that one crosspiece 12 always follows the position of one timber piece 2 ahead of a driver 4 on the feed conveyor 1.
• the abutment means 13 have, for simplicity's sake, been illustrated as pins of circular cross section. However, precision gains may be made if they are platform or buffer in shape so that they cover and abut against the greater part of the end surfaces 14 of the timber pieces.
• one of the crosspieces 12 is located in register with a timber piece 2 which has just been fed in on the transverse displacement devices 5. This implies that the timber piece in position a begins to move in a direction towards the conveyor 9 and the abutment means 13 disposed thereon. In position a, the previously mentioned movement has just begun, for which reason the end 14 of the timber piece is located a distance from the adjacent abutment means 13. As the timber pieces 2 are fed in the direction of feed 3, they are also displaced in the transverse displacement direction 8 in a direction towards the abutment means. In position b, this displacement has been completed so that the end 14 of the timber piece 2 is located in contact with the abutment means 13.
• an abutment rail 15 is disposed at the discharge end of the conveyor 9, the abutment rail being adjustable in a direction towards and away from the feed conveyor 1 corresponding to the relevant abutment means 13.
• the end 14 of the timber piece will slide along this rail so that all tendencies towards bouncing and the like will have time to fade.
• the transverse displacement devices 5 with their included rollers 6 also terminate, so that, after the passage of the abutment rail 15, there no longer exists any force transversely of the direction of feed 3. In this state, the timber pieces are thus positioned with the end 14 in an extremely accurate manner.
• Fig. 2 shows the apparatus according to Fig. 1 seen in a pure horizontal side elevation in the direction of the arrow B. It will be apparent from Fig. 2 that the chain or belt 10 in the conveyor 9 runs over wheels 16 with the above- mentioned centre axes 11.
• the abutment means 13 are shown schematically and are illustrated only in the form of upstanding pins.
• the crosspieces 12 in the conveyor 9 have a plurality of fixed positions for the abutment means 13. In all of these positions, there are abutment means, but these are movable between upwardly directed, active positions and retracted, passive positions. This is realised in that the abutment means 13 are displaceable in the crosspieces 12 between the active position illustrated at the upper part of the conveyor 9 in Fig. 2 to the retracted, passive position which is shown at the lower part of the conveyor.
• an activator 17 and a recuperator 18 are employed for switching the abutment means between the active and the passive positions.
• the recuperator is technically in the form of a guide plate 19 against which the outer ends of the abutment means 13 come into contact, the abutment means being urged into their sockets in the crosspieces 12 to the passive position.
• This is realised in that the guide plate 19 and the lower part of the conveyor 9 form a cuneiform space which tapers in the direction of movement of the conveyor.
• the activator 17 has a number of guide rails 20 which are disposed to form, on the lower part of the conveyor 9, a cuneiform space tapering in the direction of movement of the conveyor.
• the guide rails 20 which are the same in number as the number of rows of abutment means 13 (see Fig. 1), are switchable between the active position illustrated in Fig. 2 by means of a switching device in the form of a cy Under unit 21.
• a switching device in the form of a cy Under unit 21.
• the abutment means 13 may pass without being urged out to the active position.
• the abutment means can, in this manner, be activated in rows to the active positions or pass the activator 17 without being activated, the positioning of the ends 14 of the timber pieces 2 may be varied stepwise with great accuracy.
• Figs. 3-5 show a slightly modified embodiment of the present invention.
• the reference numerals from Fig. 1 have been inserted, and it should be observed that the design, construction and function of the feed conveyor 1 and the transverse displacement device are unchanged. That which has been changed in this embodiment is merely the conveyor 9 and the anchorages of the abutment means 13 therein.
• the abutment means are one in number per crosspiece 12 in the conveyor 9 and, further, the abutment means are displaceable along the longitudinal direction of the crosspieces 12.
• the abutment means 13 on the inside of the conveyor 9 have guide bodies 22 which are disposed for displacement of the abutment means along the crosspieces 12.
• the guide bodies 22 are place so as to cooperate with a recuperator 18 and an activator 17 in a manner which is analogous with that described above with reference to Fig. 2.
• the recuperator 18 includes a guide rail 23 which is obliquely inclined in relation to the direction of movement of the lower part of the conveyor 9.
• the activator 17 in the embodiment according to Figs. 3-5 has been designed as a guide profile 24 in which the guide bodies 22 may be accommodated and displaced in the longitudinal direction of the guide profile.
• the guide profile is pivotally secured at its end located in position e in order there to accommodate a guide body 22 in a recuperated position, and thereafter lead the guide body to the activated position in position f.
• a switching unit in the form of a piston/ cylinder unit.
• the switching unit 25 is further provided with two mutually guide plates 26 which impart a terminal and accurate positioning to the abutment means 13 and the associated guide body 22.
• the embodiment according to Figs. 3-5 suitably includes some appropriate mechanism for locking the abutment means 13 in the adjusted longitudinal position along the crosspieces 12.

Landscapes

• Life Sciences & Earth Sciences (AREA)
• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Wood Science & Technology (AREA)
• Forests & Forestry (AREA)
• Attitude Control For Articles On Conveyors (AREA)
• Vehicle Body Suspensions (AREA)
• Body Structure For Vehicles (AREA)
• Die Bonding (AREA)

Applications Claiming Priority (3)

Publications (2)

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ID=20407201

Family Applications (1)

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• 1997
  • 1997-05-30 SE SE9702081A patent/SE511453C2/sv not_active IP Right Cessation
• 1998
  • 1998-05-11 AT AT98925991T patent/ATE248763T1/de active
  • 1998-05-11 CA CA002292567A patent/CA2292567C/en not_active Expired - Lifetime
  • 1998-05-11 DE DE69817873T patent/DE69817873T2/de not_active Expired - Lifetime
  • 1998-05-11 WO PCT/SE1998/000857 patent/WO1998054076A1/en active IP Right Grant
  • 1998-05-11 EP EP98925991A patent/EP1047619B1/de not_active Expired - Lifetime

Non-Patent Citations (1)

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