WO2000061340A1 - A device in a saw mill - Google Patents

A device in a saw mill Download PDF

Info

Publication number
WO2000061340A1
WO2000061340A1 PCT/SE2000/000706 SE0000706W WO0061340A1 WO 2000061340 A1 WO2000061340 A1 WO 2000061340A1 SE 0000706 W SE0000706 W SE 0000706W WO 0061340 A1 WO0061340 A1 WO 0061340A1
Authority
WO
WIPO (PCT)
Prior art keywords
driver means
basic part
leg part
leg
mentioned
Prior art date
Application number
PCT/SE2000/000706
Other languages
French (fr)
Inventor
Lennart Strandberg
Original Assignee
Töfab
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 Töfab filed Critical Töfab
Priority to AU44443/00A priority Critical patent/AU4444300A/en
Publication of WO2000061340A1 publication Critical patent/WO2000061340A1/en
Priority to SE0103306A priority patent/SE523591C2/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07C—POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
    • B07C5/00—Sorting according to a characteristic or feature of the articles or material being sorted, e.g. by control effected by devices which detect or measure such characteristic or feature; Sorting by manually actuated devices, e.g. switches
    • B07C5/04—Sorting according to size
    • B07C5/12—Sorting according to size characterised by the application to particular articles, not otherwise provided for
    • B07C5/14—Sorting timber or logs, e.g. tree trunks, beams, planks or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07C—POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
    • B07C5/00—Sorting according to a characteristic or feature of the articles or material being sorted, e.g. by control effected by devices which detect or measure such characteristic or feature; Sorting by manually actuated devices, e.g. switches

Definitions

  • This invention relates to a device in a saw mill, which comprises a raw-sorting mill and an adjusting mill, in which sawn boards are intended to be brought up to a transporting device comprising driver means, which are arranged on endless chains, whereafter the transporting device is intended to take the boards further towards stations where the boards are laid off, each driver means having a U-form like design and comprising three main parts, a basic part and two leg parts, which in the normal case form an essentially right angle with the basic part.
  • a great problem with this type of devices is the fact that the driver means are exposed to great strains at the contact with the boards. At this contact it relatively often occurs that one of the legs is exposed to such forces that it is deformed, whereby the driver means in question becomes unusable. This in its turn has the consequence that the adjusting mill has to be stopped, resulting in a total operation stop for the saw mill.
  • This invention intends to remove the problems with known technique and to provide a new driver means, which has such a special design that it can resist the hard contact with the boards. This has been made possible by a device of the kind mentioned by way of introduction, which has the features mentioned in the main claim.
  • a suitable embodiment of the invention shall be described more closely below with reference to the accompanying drawings, where Fig. 1 schematically shows an adjusting mill with a great number of driver means, and Fig. 2 shows the new driver means.
  • This transporting device has endless chains 3 on which a great number of driver means 4 are arranged.
  • driver means has a U-form like design and comprises three main parts, a basic part 5 and two leg parts 6, 7, each of which in the normal case forms an essentially right angle with the basic part 5.
  • a device 8 is shown which is intended to take the sawn boards up to the transporting device.
  • this transporting device is intended to take the boards on its underside further towards stations where the boards are laid off. In this connection the boards are resting on the top side of the lower leg part 3, whereas the corner between the upper leg 7, seen in transporting position, and the basic part 5 is articulately fastened in the chain 3.
  • Fig. 1 is shown there that the shorter leg 7 is that leg which is in contact with the endless chain 3. Further- more, it is apparent that when one driver means 4 closes the rounding of an end wheel 9 of the endless chain 3, a lower corner 10 of the driver means 4, i.e. the corner between the lower leg 6 and the basic part 5, will collide with a board 9 which is fed forwards by the device 8. This contact between the board and the driver means can be so violent that the leg part 7 is deformed.
  • a driver means which in similarity with known driver means has three main parts, namely a basic part 12, a long leg part 13 and a shorter leg part 14.
  • the driver means preferably has such a design that the basic part 12 and the leg part 13 are made in one piece, the angle between these two parts being essentially 90°.
  • leg part 14 has such an extension that it in normal position forms an angle with the basic part 12, which is essentially 90°.
  • the new and special with this driver means is that the short leg part 14 is articulately connected with the basic part 12 in such a way that the leg part 14 can be folded inwards towards the basic part 12, i.e. the angle between the leg part 14 and the basic part 12 can be made less than 90°. Due to that fact the great advantage is achieved that the leg part 14 is folded back if the contact of the driver means with a board becomes too violent. As has been mentioned such a violent contact has the consequence that also the contact between the leg part 14 and the endless chain 3 and its end wheel 9 can be so violent that the leg part, if it should not fold back, could be deformed. However, it is important that the leg part 14 retakes its normal position after it has been folded back.
  • normal position is meant a position where the leg part 14 forms an essentially right angle with the basic part 9.
  • a bar 15 is arranged between the basic part 12 and the leg part 14.
  • the one end portion 16 of the bar 15 is fastened on the basic part 12 at the point 17 in such a way that the bar has a fixed position in the driver means.
  • the other end portion 18 of the bar is articulately fastened to the leg part 14 at the point 19, which accordingly makes possible the folding in of the leg part 14 in the direction towards the basic part 12.
  • the leg part 14 at its inner end portion 20, i.e. that portion which is in contact with the upper end portion 21 of the basic part 12, has a first fastening point 22 for the one end of a strong rubber band 23 or the like, the other end of each is fastened to a second fastening point 24 is short distance down on the basic part 12.
  • the leg part 14 When contacting an object, the leg part 14 will accordingly be folded inwards against the action of the spring force which is generated by the stretched rubber band 23, whereafter the stretched rubber band pulls back the leg part 14 to normal position after the object having been passed.
  • the new driver means is preferably made of plastic and/or metallic material.
  • the invention is of course not limited to the mentioned embodiment but can be modified within the scope of the following claims.
  • the means generating the spring force could be arranged in another way.

Abstract

This invention relates to a device in a saw mill, which comprises a raw sorting mill and an adjusting mill, in which sawn boards are intended to be taken up to a transporting device comprising driver means, which are arranged on endless chains, whereafter the transporting device is intended to take the boards further towards stations where the board are laid off, each driver means having a U-form like design and comprising three main parts, a basic part and two leg parts, which in the normal case form essentially a right angle with the basic part. According to the invention the device is characterized in that the one leg part (7, 14) of the driver means (4) is articulately suspended in relation to the basic part (5, 12) of the driver means in such a way that the mentioned leg part can be folded inwards towards the mentioned basic part when suddenly and violently contacting the endless chain (3) at the passage past an end wheel, which sudden contact is the result of a stroke arising when a lower corner (10) of the driver means (4), seen in the transporting position, hits a board (11) which shall be transported further by the transporting device, and thereafter automatically returns to the normal position, i.e. a position where the mentioned leg part (7, 14) forms an essentially right angle with the basic part (5, 12).

Description

A device in a saw mill
This invention relates to a device in a saw mill, which comprises a raw-sorting mill and an adjusting mill, in which sawn boards are intended to be brought up to a transporting device comprising driver means, which are arranged on endless chains, whereafter the transporting device is intended to take the boards further towards stations where the boards are laid off, each driver means having a U-form like design and comprising three main parts, a basic part and two leg parts, which in the normal case form an essentially right angle with the basic part.
This type of device is common in saw mills. In this connection the three main parts of each driver means are made in one piece.
A great problem with this type of devices is the fact that the driver means are exposed to great strains at the contact with the boards. At this contact it relatively often occurs that one of the legs is exposed to such forces that it is deformed, whereby the driver means in question becomes unusable. This in its turn has the consequence that the adjusting mill has to be stopped, resulting in a total operation stop for the saw mill.
This invention intends to remove the problems with known technique and to provide a new driver means, which has such a special design that it can resist the hard contact with the boards. This has been made possible by a device of the kind mentioned by way of introduction, which has the features mentioned in the main claim. A suitable embodiment of the invention shall be described more closely below with reference to the accompanying drawings, where Fig. 1 schematically shows an adjusting mill with a great number of driver means, and Fig. 2 shows the new driver means.
Referring to Fig. 1 is shown there an adjusting mill comprising a transporting device 1 for boards 2. This transporting device has endless chains 3 on which a great number of driver means 4 are arranged. These driver means has a U-form like design and comprises three main parts, a basic part 5 and two leg parts 6, 7, each of which in the normal case forms an essentially right angle with the basic part 5. Furthermore, a device 8 is shown which is intended to take the sawn boards up to the transporting device. Thus, this transporting device is intended to take the boards on its underside further towards stations where the boards are laid off. In this connection the boards are resting on the top side of the lower leg part 3, whereas the corner between the upper leg 7, seen in transporting position, and the basic part 5 is articulately fastened in the chain 3. The contact between the driver means and the boards can be very violent when feeding the boards into the transporting device provided with the driver means, which leads to great strains on the driver means. Thus, in certain cases one of the leg parts can be exposed to such forces that it is deformed. As is apparent from Fig. 1 is shown there that the shorter leg 7 is that leg which is in contact with the endless chain 3. Further- more, it is apparent that when one driver means 4 closes the rounding of an end wheel 9 of the endless chain 3, a lower corner 10 of the driver means 4, i.e. the corner between the lower leg 6 and the basic part 5, will collide with a board 9 which is fed forwards by the device 8. This contact between the board and the driver means can be so violent that the leg part 7 is deformed. The reason of that is that the force from the contact point between the board and the driver means is propagated up to the driver means 4 of the leg part 7, which is exposed to a braking force in the violent contact with the endless chain 3 and its end wheel 9. This known problem is intended to be eliminated by means of the driver means according to Fig. 2.
According to Fig. 2 is shown there a driver means which in similarity with known driver means has three main parts, namely a basic part 12, a long leg part 13 and a shorter leg part 14. In this connection the driver means preferably has such a design that the basic part 12 and the leg part 13 are made in one piece, the angle between these two parts being essentially 90°.
Also the leg part 14 has such an extension that it in normal position forms an angle with the basic part 12, which is essentially 90°.
The new and special with this driver means is that the short leg part 14 is articulately connected with the basic part 12 in such a way that the leg part 14 can be folded inwards towards the basic part 12, i.e. the angle between the leg part 14 and the basic part 12 can be made less than 90°. Due to that fact the great advantage is achieved that the leg part 14 is folded back if the contact of the driver means with a board becomes too violent. As has been mentioned such a violent contact has the consequence that also the contact between the leg part 14 and the endless chain 3 and its end wheel 9 can be so violent that the leg part, if it should not fold back, could be deformed. However, it is important that the leg part 14 retakes its normal position after it has been folded back. According to the invention this automatically occurs by the fact that the leg part 14 is folded inwards towards the action of a spring force, which makes possible that the leg part 14 returns to its normal position as fast as the obstacle has ceased. With normal position is meant a position where the leg part 14 forms an essentially right angle with the basic part 9. As is apparent from Fig. 2 a bar 15 is arranged between the basic part 12 and the leg part 14. In this connection the one end portion 16 of the bar 15 is fastened on the basic part 12 at the point 17 in such a way that the bar has a fixed position in the driver means. The other end portion 18 of the bar is articulately fastened to the leg part 14 at the point 19, which accordingly makes possible the folding in of the leg part 14 in the direction towards the basic part 12. Furthermore, the leg part 14 at its inner end portion 20, i.e. that portion which is in contact with the upper end portion 21 of the basic part 12, has a first fastening point 22 for the one end of a strong rubber band 23 or the like, the other end of each is fastened to a second fastening point 24 is short distance down on the basic part 12. When contacting an object, the leg part 14 will accordingly be folded inwards against the action of the spring force which is generated by the stretched rubber band 23, whereafter the stretched rubber band pulls back the leg part 14 to normal position after the object having been passed.
The new driver means is preferably made of plastic and/or metallic material. The invention is of course not limited to the mentioned embodiment but can be modified within the scope of the following claims. Thus, the means generating the spring force could be arranged in another way.

Claims

Claims
1. A device in a saw mill which comprises a raw sorting mill and an adjusting mill, in which sawn boards are intended to be taken up to a transporting device comprising driver means, which are arranged on endless chains, whereafter the trans- porting device is intended to take the boards further towards stations where the boards are laid off, each driver means having a U-form like design and comprising three main parts, a basic part and two leg parts, which in the normal case form essentially a right angle with the basic part, characterized in that the one leg part (7, 14) of the driver means (4) is articulately suspended in relation to the basic part (5, 12) of the driver means in such a way that the mentioned leg part can be folded inwards towards the mentioned basic part when suddenly and violently contacting the endless chain (3) at the passage past an end wheel, which sudden contact is the result of a stroke arising when the lower corner (10) of the driver means 4, seen in the transporting position, hits a board (11) which shall be transported further by the transporting device, and thereafter automatically returns to the normal position, i.e. a position where the mentioned leg part (7, 14) forms an essentially right angle with the basic part (5, 12).
2. A device according to claim 1, characterized in that a bar (15) is arranged between the basic part (12) and the one leg part (14), that the one end por- tion (16) of the bar (15) is fastened on the basic part (12) in such a way that the bar has a fixed position on the driver means (4), and that the other end portion (18) of the bar (15) is articulately fastened to the leg part (14) in such a way that the mentioned leg part can be folded in towards the mentioned basic part (12).
3. A device according to claim 2, the one leg part (14) having an inner end portion (20) which is placed at the upper end portion (21) of the basic part (12), characterized in that the mentioned inner portion (20) has a first fastening point (22) for the one end of an elongated spring means (23), the other end which is fastened to a second fastening point (24) a short distance under the upper end portion (21) of the basic part (12).
4. A device according to any one of the preceding claims, characterized in that the basic part (12) of the driver means (4) and the other leg part (13) are made in one piece.
5. A device according to any one of the preceding claims, characterized in that the driver means (4) is made of plastic and/or metallic material.
PCT/SE2000/000706 1999-04-14 2000-04-13 A device in a saw mill WO2000061340A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU44443/00A AU4444300A (en) 1999-04-14 2000-04-13 A device in a saw mill
SE0103306A SE523591C2 (en) 1999-04-14 2001-10-04 Driving device for use in saw mill has drive unit with one leg foldably suspended to basic portion such that leg forms right angle with basic portion when in normal position, otherwise, leg is folded

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9901321-1 1999-04-14
SE9901321A SE9901321D0 (en) 1999-04-14 1999-04-14 Device in a sawmill

Publications (1)

Publication Number Publication Date
WO2000061340A1 true WO2000061340A1 (en) 2000-10-19

Family

ID=20415204

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE2000/000706 WO2000061340A1 (en) 1999-04-14 2000-04-13 A device in a saw mill

Country Status (3)

Country Link
AU (1) AU4444300A (en)
SE (1) SE9901321D0 (en)
WO (1) WO2000061340A1 (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3399768A (en) * 1965-05-19 1968-09-03 Hammars Mek Verkst Ab Lumber or board sorting apparatus
US3700120A (en) * 1971-08-02 1972-10-24 Us Natural Resources Apparatus for collecting and discharging lumber
SE388405B (en) * 1975-02-05 1976-10-04 Hammars Mekaniska Verkstad Ab TRANSPORT DEVICE FOR TRANSPORTING WOOD TO SELECTED TRADE UNIONS
US4318807A (en) * 1979-09-18 1982-03-09 Alpo Rysti Method and apparatus for drop-sorting of timber

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3399768A (en) * 1965-05-19 1968-09-03 Hammars Mek Verkst Ab Lumber or board sorting apparatus
US3700120A (en) * 1971-08-02 1972-10-24 Us Natural Resources Apparatus for collecting and discharging lumber
SE388405B (en) * 1975-02-05 1976-10-04 Hammars Mekaniska Verkstad Ab TRANSPORT DEVICE FOR TRANSPORTING WOOD TO SELECTED TRADE UNIONS
US4318807A (en) * 1979-09-18 1982-03-09 Alpo Rysti Method and apparatus for drop-sorting of timber

Also Published As

Publication number Publication date
SE9901321D0 (en) 1999-04-14
AU4444300A (en) 2000-11-14

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