GB2154925A - Cutting fibrous material - Google Patents
Cutting fibrous material Download PDFInfo
- Publication number
- GB2154925A GB2154925A GB08505177A GB8505177A GB2154925A GB 2154925 A GB2154925 A GB 2154925A GB 08505177 A GB08505177 A GB 08505177A GB 8505177 A GB8505177 A GB 8505177A GB 2154925 A GB2154925 A GB 2154925A
- Authority
- GB
- United Kingdom
- Prior art keywords
- knife
- cutting
- cut
- blade
- mineral wool
- 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- Withdrawn
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
- B26D3/00—Cutting work characterised by the nature of the cut made; Apparatus therefor
- B26D3/06—Grooving involving removal of material from the surface of the work
- B26D3/065—On sheet material
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Forests & Forestry (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Treatment Of Fiber Materials (AREA)
- Knives (AREA)
Abstract
A method of cutting hard fibrous material particularly slabs thereof containing a large amount of bonding agent using a rotatable knife 10 the, or each blade (11, Fig. 2) of which extends radially beyond a root diameter (2r) of the knife by a distance greater than the depth of the cut. In order to reduce the tendency of the knife to deviate from the intended line of the cut, particularly when slanting cuts are made, the knife is oblong, the difference between the smaller dimension (r, Fig. 2) and the larger dimension (R, Fig. 2) being greater than the depth of the cut in the slab. <IMAGE>
Description
SPECIFICATION
Cutting fibrous material
The present invention relates to the cutting of fibrous material and more particularly to a method of at least partly cutting through slabs of such material, particularly hard mineral wool with a large content of bonding agent.
For cutting or making grooves into mineral wool rotating sawblades which may be provided with hard metal teeth are normally used. In order to reduce the amount of dust generated it is preferred that the blade be as thin as possible, but as the stiffness of the blade decreases, the risk that the blade will not follow the intended track in the material increases. This leads to inaccurate results and a poor surface finish. In addition, overheating occurs due to the high friction acting between the material and the blade.
One object of the invention is to at least mitigate the above disadvantages.
According to this invention we propose a method of cutting fibrous material particularly hard mineral wool containing a bonding agent, using a rotating knife the, or each blade of which extends radially beyond a root diameter of the knife by a distance greater than the depth of the cut. For cutting a Vgroove, two rotating knives are set at a desired angle relative to one another such that the cuts made intersect to define the bottom of the V-groove.
We also propose a rotating knife for at least partly cutting through slabs of fibrous material, particularly hard mineral wool with a large content of bonding agent, characterised in that the blade of the knife is oblong or alternatively triangular, the shortest distance from the centre to its edge being smaller than the distance from the axis of rotation to the surface of the slab to be cut.
The knife according to the invention does not cut in the same way as a normal sawblade, by which the teeth machine the material at the bottom of the cut, but acts like an axe, cutting its way through the material.
As the blade does not touch the material when the edge hits the end of the cut, the knife will not show any tendency to deviate from the planned line, but cuts exactly in the direction, in which it is moved. The blade of the knife may therefore be thin and does not therefore produce a great deal of dust. As the blade is not in contact with the material all the time, the amount of heat produced is reduced as is the energy required for cutting.
The ability of the knife to follow the intended trace is particularly useful when angled cuts are made, i.e. for making a chamfered cutting on a fibre plate or a carpet etc., and for partly cutting through slabs, for example, when making a V-cut into the plate material.
In a preferred embodiment, the edges of the knife are substantially straight. This ensures that the outer end of the edge will hit the material first, which improves the ability to cut along a predetermined trace.
One embodiment of the invention will now be described by way of example with reference to the accompanying drawings, in which:
Figure 1 shows apparatus for cutting a Vgroove in a mineral wool slab, and
Figure 2 shows a knife-blade for use in the cutting apparatus of Fig. 1.
The apparatus according to Fig. 1 for making V-cuts into a mineral wool slab 1 comprises a housing 2, to which an electric motor 3 is connected. In the housing 2 two shafts 4 and 5 are mounted, the shafts being interconnected by means of bevel gears 6. The output shaft of the electric motor is also provided with a pinion 7 driving a gear 8 on the shaft 4. Each of the shafts 4, 5 has a hub 9 on which a knife blade 10 is mounted. The diameter of the knives 10 is such that in the mineral wool slab, the two cuts will meet to form the bottom of the V-groove.
Fig. 2 shows a knife 10 for use in the apparatus of Fig. 1. The knife 10 has a larger radius R, the size of which corresponds to the depth of the desired cut, and a smaller radius, which is so small that the knife is free from the material at this radius. From the root diameter (i.e. the smaller radius) the knife has wing like blades 11 extending to the larger radius, the wings or blades 11 preferably having straight edges 1 2. The knife shown in
Fig. 2 has two wings, but an embodiment having three wings may also be used. The knife 10 has a central mounting hole 1 3 and two further holes 14, into which a pair of driving studs is fitting. The knife is fastened in a conventional manner with a nut.Due to the fact that the smaller distance r of the knife is smaller than the distance between the hub 9 and the slab 1 in the cutting plane, the knife
10 will hit the slab first at the larger diameter
R, and therefore, each new cut starts correctly in the plane of the knife. Therefore, the knife will even in a slanted cut provide a clean and accurate cut and does not tend to deviate from the intended line.
1. A method of cutting fibrous material particularly hard mineral wool containing a bonding agent, using a rotating knife the, or each blade of which extends radially beyond a root diameter of the knife by a distance greater than the depth of the cut.
2. A method according to claim 1 for cutting a V-groove in fibrous material wherein two rotating knives are set at a desired angle relative to one another such that the cuts made intersect to define the bottom of the Vgroove.
3. A rotating knife for at least partly cut
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (5)
1. A method of cutting fibrous material particularly hard mineral wool containing a bonding agent, using a rotating knife the, or each blade of which extends radially beyond a root diameter of the knife by a distance greater than the depth of the cut.
2. A method according to claim 1 for cutting a V-groove in fibrous material wherein two rotating knives are set at a desired angle relative to one another such that the cuts made intersect to define the bottom of the Vgroove.
3. A rotating knife for at least partly cut ting through slabs of fibrous material, particularly hard mineral wool with a large content of bonding agent, characterised in that the blade of the knife is oblong or alternatively triangular, the shortest distance from the centre to its edge being smaller than the distance from the axis of rotation to the surface of the slab to be cut.
4. A knife according to claim 3, characterised in that the knife is oblong or alternatively triangular, the difference between its smaller radius (r) and its larger radius (R) being greater than the intended depth of cutting.
5. A knife according to claim 3 or claim 4, characterised in that the edges of the knife are substantially straight.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DK129084A DK129084A (en) | 1984-02-29 | 1984-02-29 | ROTATING KNIFE FOR AT LEAST PARTICULAR CUTTING OF FIBER MATERIAL SHEETS |
Publications (2)
Publication Number | Publication Date |
---|---|
GB8505177D0 GB8505177D0 (en) | 1985-04-03 |
GB2154925A true GB2154925A (en) | 1985-09-18 |
Family
ID=8103179
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB08505177A Withdrawn GB2154925A (en) | 1984-02-29 | 1985-02-28 | Cutting fibrous material |
Country Status (3)
Country | Link |
---|---|
DE (1) | DE8505529U1 (en) |
DK (1) | DK129084A (en) |
GB (1) | GB2154925A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108789521A (en) * | 2018-06-01 | 2018-11-13 | 厦门市锦坤工贸有限公司 | Filling machine |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL193240C (en) * | 1988-08-03 | 1999-04-02 | Sallmetall Bv | Method and device for cutting sandwich panels. |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1066536A (en) * | 1965-01-12 | 1967-04-26 | Agfa Gevaert Ag | Improvements relating to a guillotine for cutting material in web form |
GB1240702A (en) * | 1968-07-08 | 1971-07-28 | Walker & Smith Batley Ltd | Improvements in rotary cutting means |
GB1292618A (en) * | 1968-10-14 | 1972-10-11 | Chet Ind Proprietary Ltd | Match shafts |
GB1349428A (en) * | 1971-06-17 | 1974-04-03 | Rimoldi C Spa Virginio | Rotary cutter device for sewing machines |
GB1385515A (en) * | 1971-04-16 | 1975-02-26 | Eastman Kodak Co | Film handling apparatus |
GB2102717A (en) * | 1981-07-15 | 1983-02-09 | Grapha Holding Ag | A device for trimming paper sheets |
-
1984
- 1984-02-29 DK DK129084A patent/DK129084A/en not_active IP Right Cessation
-
1985
- 1985-02-27 DE DE19858505529 patent/DE8505529U1/en not_active Expired
- 1985-02-28 GB GB08505177A patent/GB2154925A/en not_active Withdrawn
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1066536A (en) * | 1965-01-12 | 1967-04-26 | Agfa Gevaert Ag | Improvements relating to a guillotine for cutting material in web form |
GB1240702A (en) * | 1968-07-08 | 1971-07-28 | Walker & Smith Batley Ltd | Improvements in rotary cutting means |
GB1292618A (en) * | 1968-10-14 | 1972-10-11 | Chet Ind Proprietary Ltd | Match shafts |
GB1385515A (en) * | 1971-04-16 | 1975-02-26 | Eastman Kodak Co | Film handling apparatus |
GB1349428A (en) * | 1971-06-17 | 1974-04-03 | Rimoldi C Spa Virginio | Rotary cutter device for sewing machines |
GB2102717A (en) * | 1981-07-15 | 1983-02-09 | Grapha Holding Ag | A device for trimming paper sheets |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108789521A (en) * | 2018-06-01 | 2018-11-13 | 厦门市锦坤工贸有限公司 | Filling machine |
Also Published As
Publication number | Publication date |
---|---|
DE8505529U1 (en) | 1985-05-23 |
GB8505177D0 (en) | 1985-04-03 |
DK129084A (en) | 1985-08-30 |
DK129084D0 (en) | 1984-02-29 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |