CA1212014A - Dividing knife means for a saw machine - Google Patents
Dividing knife means for a saw machineInfo
- Publication number
- CA1212014A CA1212014A CA000442522A CA442522A CA1212014A CA 1212014 A CA1212014 A CA 1212014A CA 000442522 A CA000442522 A CA 000442522A CA 442522 A CA442522 A CA 442522A CA 1212014 A CA1212014 A CA 1212014A
- Authority
- CA
- Canada
- Prior art keywords
- dividing knife
- dividing
- saw
- log
- knife
- 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
Links
Classifications
-
- 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
- B27G19/08—Accessories for keeping open the saw kerf, e.g. riving knives or wedge plates
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Wood Science & Technology (AREA)
- Forests & Forestry (AREA)
- Sawing (AREA)
- Sewing Machines And Sewing (AREA)
Abstract
Abstract of Disclosure A dividing knife means for a saw machine, consisting of at least one dividing knife located in the saw machine after the sawing blade , as viewed in the sawing direction of the log , keep-ing the saw cut open. The dividing knife is a flange rotating about its axis and of which a segment acts as a part spreading the saw cut. Therefore, the rotation of the dividing knife reduces the friction arising by the contact of the log and the dividing knife. It has specifically been a problem in connection with fixed dividing knives of prior art that the dividing knife cannot be made very thick because, acting as a fixed wedge, it impedes the progress of the log through the machine.
Description
i~120~L
D;viding knife means for a saw machine The present invention concerns a dividing knife means for a saw machine, consisting of at least one dividing knife located, as viewed in the direction in which the log is being ripped, after the saw blade and holding the saw cut open.
1.
Known in the art are elongated fixed dividing knives mounted after the saw blade as viewed in the direction of sawing. The function of dividing kn;ves of this kind is to keep the saw cut open, but their problem ;s that the dividing knife cannot be made very thick in relation to the thickness of the saw blade, because as a fixed wedge it impedes the passage of the log through the machine. Eow-ever, a dividing knife which is too thin compared with the thick-ness of the saw blade leaves the saw cut so narrow that the saw blade tends to rub against the log also with parts other than its cutting edges, for instance with its sides. This in turn causes heating of the blade and reduction of its rigidity, whereby the saw cut wil.] be inaccurate and the dimensional accuracy of the sawn timber deteriorates. In short logs, the saw cut may in fact become so pinched that the progress of the log in ehe direction of sawing stops. Particularly problematic are the dividing knives of prior art in conjunction with curved sawing, in which case the saw blade or blades due to the crookedness of the log that i.s being sawn are subject tc a lateral pressure, as viewed in the sawing direction, against the fixed dividing knife, the friction arising therefrom retarding the progress through the machine of the timber that is being processed.
The obJect of the invention is to eliminate the drawbacks menti.on-ed. The di.viding knlfe of the invention is characteri.zed in thaw the dividing knife is a flange rotatabl.e about its axis and a seg-ment thereof serving as a part .spreading the saw cut. By the aid of the invention, the rotary motion of the dividing knife wi.ll reduce the friction resulting from the contact between the log and the .,,,~ ' I
dividing knife, whereby it becomes possible to use thicker dividing knives than those Tcnown in the art and to achieve for the operation of the saw blade a wlder saw cut than beFore. Rotating dividing knives may be used on one side or on both sides of the saw cut.
An advantageous embodiment of the invention is characteriæed in that the dlviding knire is freely rotatable about its axis. Thus, the dividing knife derives its rotation from the friction between tlle saw cut and the dividing knife.
Another embodiment of the invention is characterized in that the dividing knife has been contro]led to rotate in an advantageous relation to the speed at which the log is progressing. Therefore the dividing knife cannot obstnlct the progress of the log; on the contrary, it aids the forward feeding of the log.
A third embodiment of the invention is characterized in that the dividing knife is movahle on its shaft. Ilereby the setting of the dividing knife is adjustahle with ease fGr different sawing opera-tions, to be proper1y positioned for the saw cut.
The inven,ion is described in the following by the aid of an example, reference being made to the drawing attached, wherein Fig. 1 presents the control and working members of a sawing machine, viewed oh]iquely from above.
Fig. 2 shows the d;v;ding knife means, viewed along the line II-II
in Fig. 1.
The dividing knife means of the sawinK n~achine consists of three dividing knives 1 above each other, ]ocated in the saw n~achine, as 'i viewecl in the sawing direction of the ]og 2, after the saw blade 3 and keeping the saw cut open. The dividing knife is a flange rotat-ing bolt its axis 4 and a segment of which acts as a part spreading the saw cut.
Since the dividing knives l are rotating about their axis 4, they reduce the friction caused hy the contact between the loo. and the dividing knife, whereby thicker dividing kn;ves than those in use at present can be used and a wider saw cut than before can be achieved for the operation of ,he saw blade.
It is obvious to a person skilled in the art that different embodi-ments of the invention may vary within the scope of the claims presented below. For instance, dividing knives ean be used, as in the example, on both sides of the saw cut or only on one side of the saw cut. The number of dividing knives l may vary from one to several.
D;viding knife means for a saw machine The present invention concerns a dividing knife means for a saw machine, consisting of at least one dividing knife located, as viewed in the direction in which the log is being ripped, after the saw blade and holding the saw cut open.
1.
Known in the art are elongated fixed dividing knives mounted after the saw blade as viewed in the direction of sawing. The function of dividing kn;ves of this kind is to keep the saw cut open, but their problem ;s that the dividing knife cannot be made very thick in relation to the thickness of the saw blade, because as a fixed wedge it impedes the passage of the log through the machine. Eow-ever, a dividing knife which is too thin compared with the thick-ness of the saw blade leaves the saw cut so narrow that the saw blade tends to rub against the log also with parts other than its cutting edges, for instance with its sides. This in turn causes heating of the blade and reduction of its rigidity, whereby the saw cut wil.] be inaccurate and the dimensional accuracy of the sawn timber deteriorates. In short logs, the saw cut may in fact become so pinched that the progress of the log in ehe direction of sawing stops. Particularly problematic are the dividing knives of prior art in conjunction with curved sawing, in which case the saw blade or blades due to the crookedness of the log that i.s being sawn are subject tc a lateral pressure, as viewed in the sawing direction, against the fixed dividing knife, the friction arising therefrom retarding the progress through the machine of the timber that is being processed.
The obJect of the invention is to eliminate the drawbacks menti.on-ed. The di.viding knlfe of the invention is characteri.zed in thaw the dividing knife is a flange rotatabl.e about its axis and a seg-ment thereof serving as a part .spreading the saw cut. By the aid of the invention, the rotary motion of the dividing knife wi.ll reduce the friction resulting from the contact between the log and the .,,,~ ' I
dividing knife, whereby it becomes possible to use thicker dividing knives than those Tcnown in the art and to achieve for the operation of the saw blade a wlder saw cut than beFore. Rotating dividing knives may be used on one side or on both sides of the saw cut.
An advantageous embodiment of the invention is characteriæed in that the dlviding knire is freely rotatable about its axis. Thus, the dividing knife derives its rotation from the friction between tlle saw cut and the dividing knife.
Another embodiment of the invention is characterized in that the dividing knife has been contro]led to rotate in an advantageous relation to the speed at which the log is progressing. Therefore the dividing knife cannot obstnlct the progress of the log; on the contrary, it aids the forward feeding of the log.
A third embodiment of the invention is characterized in that the dividing knife is movahle on its shaft. Ilereby the setting of the dividing knife is adjustahle with ease fGr different sawing opera-tions, to be proper1y positioned for the saw cut.
The inven,ion is described in the following by the aid of an example, reference being made to the drawing attached, wherein Fig. 1 presents the control and working members of a sawing machine, viewed oh]iquely from above.
Fig. 2 shows the d;v;ding knife means, viewed along the line II-II
in Fig. 1.
The dividing knife means of the sawinK n~achine consists of three dividing knives 1 above each other, ]ocated in the saw n~achine, as 'i viewecl in the sawing direction of the ]og 2, after the saw blade 3 and keeping the saw cut open. The dividing knife is a flange rotat-ing bolt its axis 4 and a segment of which acts as a part spreading the saw cut.
Since the dividing knives l are rotating about their axis 4, they reduce the friction caused hy the contact between the loo. and the dividing knife, whereby thicker dividing kn;ves than those in use at present can be used and a wider saw cut than before can be achieved for the operation of ,he saw blade.
It is obvious to a person skilled in the art that different embodi-ments of the invention may vary within the scope of the claims presented below. For instance, dividing knives ean be used, as in the example, on both sides of the saw cut or only on one side of the saw cut. The number of dividing knives l may vary from one to several.
Claims (4)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A dividing knife means for a saw machine, consisting of at least one dividing knife, located in the saw machine after the saw blade as viewed in the sawing direction of the log, keeping the saw cut open, wherein the dividing knife is a flange rotating about its axis, a segment of it acting as a part spreading the saw cut.
2. Dividing knife means according to claim 1, wherein the dividing knife is freely rotatable about its axis.
3. Dividing knife means according to claim 1, wherein the dividing knife has been controlled to rotate in an advantageous relation to the forward speed of the log.
4. Dividing knife means according to claim 1, wherein the dividing knife is movable on its axis.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FI824207 | 1982-12-07 | ||
| FI824207A FI824207L (en) | 1982-12-07 | 1982-12-07 | DELNINGSKNIVANORDNING FOER SAOGMASKIN. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1212014A true CA1212014A (en) | 1986-09-30 |
Family
ID=8516422
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000442522A Expired CA1212014A (en) | 1982-12-07 | 1983-12-05 | Dividing knife means for a saw machine |
Country Status (9)
| Country | Link |
|---|---|
| CA (1) | CA1212014A (en) |
| CS (1) | CS240985B2 (en) |
| DD (1) | DD212691A1 (en) |
| DE (1) | DE3342882A1 (en) |
| FI (1) | FI824207L (en) |
| FR (1) | FR2537041A1 (en) |
| NO (1) | NO834471L (en) |
| PL (1) | PL142309B1 (en) |
| SE (1) | SE8306707L (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2624423A1 (en) * | 1987-12-14 | 1989-06-16 | Rhone Poulenc Films | Method for cutting spools of films made of plastic and device for implementing it |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1435252A (en) * | 1919-12-17 | 1922-11-14 | John C Haswell | Separating device for sawing machines |
| US3401785A (en) * | 1967-01-30 | 1968-09-17 | Arthur M. Ferrari | Separator unit for lumber strips |
| US3732765A (en) * | 1971-11-24 | 1973-05-15 | Albany Int Ind | Sweep table for wood-processing mill |
-
1982
- 1982-12-07 FI FI824207A patent/FI824207L/en not_active Application Discontinuation
-
1983
- 1983-11-26 DE DE19833342882 patent/DE3342882A1/en not_active Withdrawn
- 1983-12-05 FR FR8319420A patent/FR2537041A1/en active Pending
- 1983-12-05 SE SE8306707A patent/SE8306707L/en not_active Application Discontinuation
- 1983-12-05 CA CA000442522A patent/CA1212014A/en not_active Expired
- 1983-12-06 DD DD257561A patent/DD212691A1/en not_active IP Right Cessation
- 1983-12-06 NO NO834471A patent/NO834471L/en unknown
- 1983-12-07 CS CS839171A patent/CS240985B2/en unknown
- 1983-12-07 PL PL1983244956A patent/PL142309B1/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| DE3342882A1 (en) | 1984-06-07 |
| FI824207L (en) | 1984-06-08 |
| NO834471L (en) | 1984-06-08 |
| FI824207A0 (en) | 1982-12-07 |
| SE8306707L (en) | 1984-06-08 |
| PL142309B1 (en) | 1987-10-31 |
| SE8306707D0 (en) | 1983-12-05 |
| DD212691A1 (en) | 1984-08-22 |
| FR2537041A1 (en) | 1984-06-08 |
| CS240985B2 (en) | 1986-03-13 |
| PL244956A1 (en) | 1984-08-13 |
| CS917183A2 (en) | 1985-06-13 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |