Bread knife blade and method for its manufacture

专利摘要:
The present invention relates to a bread knife blade for machine sawing, which bread knife blade (1) has teeth (2) with a tooth edge (E), a toothbrush (H) on the front side of the tooth in the sawing direction, a tooth back (F) behind the tooth edge (E) and a tooth base ( B) the middle toothbrush on each tooth and the tooth ridge on the next, front tooth and tooth gaps, a tooth gap (G) being defined as the space between the tooth teeth (E) on two successive teeth (2), which knife blade has two flat sides (L, R) ; a right side (R) and a left side (L), when the knife blade is viewed obliquely from above in the sawing direction, said tooth edge (E) being constituted by a tip.
公开号:SE1250739A1
申请号:SE1250739
申请日:2012-06-29
公开日:2013-12-30
发明作者:Per-Olov Hallberg
申请人:Munkforssaagar Ab；
IPC主号:

专利说明:

15 20 25 30 35 known bread knife blades, partly functionally as it provides a better cutting surface and less spillage than known blades and in addition allows longer life than known blades.
According to further aspects of the invention it holds that: - the inclination of the toothbrush and the back of the tooth is asymmetrical and that the tooth ridge slopes significantly steeper downwards than the toothbrush, - said toothbrush has an angle in relation to the longitudinal direction in the range 20 ° - 49 °, preferably between 25 ° - The angle between a transverse line and a line between the tooth edge and the central point of the tooth ridge is in the range, -20 ° -20 °, preferably 0 ° to 15 °, and more preferably 6 ° to 10 °. the edge angle of the longitudinal edge amounts to between 6 ° and 25 °, preferably to between 10 ° and 20 °, - the thickness of the blade is between 0.2 mm - 1 mm, preferably 0.25 - 0.80 mm, most preferably 0, 35 - 0,60 mm, - the tooth ridges in the said tooth gaps are essentially substantially flat first and second teeth are unbroken and unstuck, - the blade is made of steel, with a carbon content of 0,7 - 0,8%.
DESCRIPTION OF THE FIGURES Following this, the invention will be described in more detail with reference to the accompanying figures, in which: Figures 1 and 2 show two different kinds of known bread knife blades, i.e. made according to the known relatively expensive manufacturing method described above, Figure 3 shows a side view of a bread knife blade in accordance with the preferred embodiment according to the invention, with an arrow showing the sawing direction, Figure 4 shows a detail view of a part of a bread knife blade according to the invention, according to preferred embodiment, seen from the side, and, Figure 5 shows a cross section of a bread knife blade according to Figure 4 along the line VV.
DETAILED DESCRIPTION Figures 3-5 show a preferred embodiment of a bread knife blade in accordance with the invention. The bread knife blade is intended for use in a machine saw and has a given direction of movement shown by an arrow in figure 3. The bread knife blade 1 has teeth 2 with a tooth edge E. On the front of each tooth 2 there is a toothbrush H and behind the tooth edge E there is a tooth back F. Between the toothbrush H and the tooth back F extends a tooth base B. The distance between two tooth edges E is a tooth gap G. The knife blade 1 has two flat sides, which when the knife blades look obliquely from above in the sawing direction are defined as a right side R and a left side L.
A characteristic aspect of the invention in relation to known bread knife blades is the asymmetrical extension of toothbrush H and tooth back F in relation to a transverse line T.
(Known leaves normally show symmetry). According to the invention, the asymmetry is such that the toothbrush H has an inclination ot which is sharper in relation to the longitudinal line of the blade than the corresponding angle δ (90-ß) which the tooth ridge F has in relation to the longitudinal line one, i.e. the tooth ridge H slopes significantly steeper downwards than the toothbrush H .
The bread knife blade has along the entire length of the knife blade on each side of the tooth edge E inclined grinding surfaces L1 and R1, respectively. Each of these grinding surfaces L1, R1 extends in a plane which relative to each other forms an acute angle 2 y, meaning that each of the surfaces L1, R1 forms an angle y in relation to the center plane C of the bread knife blade 1. The grinding surfaces L1, R1, extends from the tooth edge E down to in the vicinity of the tooth base B, in such a way that the tooth base B has at least partially a flat non-edge-forming surface B 1.
The tooth gaps G of a bread knife blade 1 according to the invention are in the range 2-13 mm, preferably 3-8 mm. The tooth height d is in the range 1-4 mm, more preferably 2-3 mm.
The height D of the unsharpened part of the blade is substantially greater than the tooth height on the d, preferably 1.5-5 times greater than the tooth height on the d. The inclination ot of the toothbrushes is normally in relation to the longitudinal direction of the blade in the range 10-49 degrees, preferably between -35 degrees. According to the preferred embodiment, a substantial part of the toothbrush H is flat, i.e. rectilinear, while the tooth base B preferably has a concave curvature. The ridge F extends at an angle ß relative to a transverse line T, (which is orthogonal to the longitudinal direction of the blade), which angle ß is in the range -20 to 20 degrees, preferably 0-15 degrees and more preferably in the range 6- 10 degrees.
Figure 5 shows the blade in section. The blade 1 has a thickness which is between 0.2-1 mm, preferably 0.25-0.80 mm, most preferably 0.35-0.60 mm. The grinding surfaces L1, R1 extend plane which forms an angle gamma with the central plane C, which angle γ is in the range 6-25 degrees, preferably 10-20 degrees. The blade 1 is made of steel, preferably with a carbon content of 0.7-0.8%.
Tests have shown that the blade has very good cutting properties. Somewhat surprisingly, users who participated in the tests have found that the blade produces significantly lower noise than conventional blades. In addition, which is probably related to the fact that the blade moves very stably when cutting, it has been shown that extremely little wear occurs, ie. that the blade lasts longer than normal blades.
In the manufacture of a bread knife blade 1 according to the invention, a very cost-effective manufacturing process can be used. According to this manufacturing process, a bundle of several carbon steel blades is arranged in parallel in a grinding machine. Depending on the capacity of the grinder (according to the invention, a bundle thickness of 30-100 mm, usually 40-50 mm can be handled) and the thickness t of the bread knife blade 1 can be ground between 20-200 blades at a time in a bundle, preferably at least 50 pcs. The grinding machine uses a ceramic insert that cuts out a number of tooth gaps G at a time in said bundle. Tests have shown that grinding wheels with an effective grinding width of between 80-150 mm are used to advantage. After each grinding, a successive advance takes place and a new round of tooth gaps is ground forward.
Then the bread knife blades are placed one by one in a second grinding machine, which is arranged with at least two grinding pulleys which grind out the inclined grinding surfaces L1 and R1.
The feed rate when grinding the side surfaces L1, R1 can be kept very high, normally at least 3 m per minute, but in some cases up to 15 m per minute, meaning very efficient production.
The invention is not limited by what has been mentioned above but can be varied within the scope of the appended claims. An obvious modification which is accommodated within the scope of the invention is that the grinding surfaces R1, L1 can of course be sharpened with curved grinding surfaces, but the use of flat grinding surfaces is usually preferred. Another obvious modification is that the extent of the toothbrush H may be curved, in whole or in part, and still achieve significant benefits in accordance with the basic concept of the invention. An advantage from a material point of view is that many different kinds of steels can be used for using the invention. An example of a good steel grade is UHP15, with a 0.75 percent carbon content.
Furthermore, it is understood that the knife blade 1 can be used for cutting material other than bread, with similar properties as bread. The terms first and second grinding machine are to be understood that the different grinding operations can of course be automated to take place in the machine set with the same base stand, but that even in such a case it should be considered as two different grinding machines even if they are arranged on one and the same machine stand.

权利要求:
Claims (15)
[1]
Bread knife blade for machine saw, which bread knife blade (1) has teeth (2) with a tooth edge (E), a toothbrush (H) on the front of the tooth seen in the sawing direction, a tooth back (F) behind the tooth edge (E) and a tooth base (B ) between the toothbrush of each tooth and the back of the tooth on the next, front tooth and tooth gaps, a tooth gap (G) being defined as the space between the tooth edges (E) of two successive teeth (2), which knife blade has two flat sides (L, R ), a right side (R) and a left side (L), when the knife blade is viewed obliquely from above in the sawing direction, said tooth edge (E) being constituted by a tip, characterized in that, - the knife blade along the length of the knife blade on each side of said tooth edge (E) has inclined grinding surfaces (L1, R1) which extend in a common plane and form an acute angle (y) relative to the center plane (C) of the blade (1), - said grinding surfaces (L1, R1) extend from the tooth edge (E) at the bottom in the vicinity of said tooth base (B) arranged thereon show that the tooth base (B) has at least partially a flat non-edge-forming surface.
[2]
Bread knife blade according to claim 1, characterized in that, said toothbrush (H) and tooth back (F) are arranged to extend asymmetrically with respect to a common transverse line e (T), wherein the toothbrush (H) has a slope (oi) which is more acute in relation to the longitudinal line of the blade than the corresponding angle (ö) which the tooth ridge F has in relation to the longitudinal line one.
[3]
Bread knife blade according to claim 1 or 2, characterized in that said toothbrush (H) has an angle (u) in relation to the longitudinal direction of the blade in the range 10 ° - 49 °, preferably between 25 ° - 35 °.
[4]
Bread knife blade according to claim 3, characterized in that the toothbrushes (H) are substantially flat.
[5]
Bread knife blade according to claim 2, 3 or 4, characterized in that the angle (ß) between a transverse line (T) and a line between the tooth edge and the central point of the tooth back (F) is in the range -20 ° to +20 °, preferably 0 ° to 15 °, more preferably 6 ° to 10 °.
[6]
Bread knife blade according to one of the preceding claims, characterized in that the edge angle (γ) of the longitudinal edge amounts to between 6 ° and 25 °, preferably to between 10 ° and 20 °. 10 15 20 25 30
[7]
Bread knife blade according to any one of the preceding claims, characterized in that said common plane consists of a non-curved grinding plane.
[8]
Bread knife blade according to any one of the preceding claims, characterized in that the thickness (t) of the blade is between 0.2 mm - 1 mm, preferably 0.25 - 0.80 mm, most preferably 0.35 - 0.60 mm
[9]
Bread knife blade according to any one of claims 1-4, characterized in that said first and second teeth (2) are unrestricted and unstuck.
[10]
Bread knife blade according to one of the preceding claims, characterized in that the blade (1) is made of steel, with a carbon content of 0.7 - 0.8%.
[11]
11. 1. Bread knife blade according to any one of the preceding claims, characterized in that said tooth gaps (G) have a distance of 2-13 mm, preferably 3-8 mm.
[12]
Method of manufacturing a bread knife blade (1) according to claim 1, characterized by the following manufacturing steps: a) arranged by a bundle with a number of carbon steel blades (1), parallel in a first grinding machine, b) cutting out a number of tooth gaps (G ) at a time in said bundle, c) arranging edge (E) in a blade (1) at a time by means of longitudinal planar grinding on each side of said tooth gaps (G), in a second grinding machine.
[13]
Method according to claim 12, characterized in that in step a) at least 20 leaves (1) are arranged at a time in a bundle.
[14]
Method according to claim 12 or 13, characterized in that in step b) at least 4 subsequent tooth gaps (G) are cut per leaf at a time.
[15]
Method according to one of Claims 12 to 14, characterized in that the feed speed in step c) is at least 3 m / min.

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US20040182218A1|2003-03-21|2004-09-23|Walley Chao|Saw blade|EP3564423B1|2018-04-30|2020-08-12|Betek Tasyunu Sanayi Ve Ticaret A.S.|Process for the manufacture of mineral wool panels made of two or more layers having different densities|

法律状态:

优先权:

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申请号 | 申请日 | 专利标题

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SE1250739A|SE536576C2|2012-06-29|2012-06-29|Bread knife blade and method for its manufacture|SE1250739A| SE536576C2|2012-06-29|2012-06-29|Bread knife blade and method for its manufacture|

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DK13808827.3T| DK2866983T3|2012-06-29|2013-06-24|Interception blade and a method for its preparation|

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EP13808827.3A| EP2866983B1|2012-06-29|2013-06-24|A bread-knife blade and a method for its manufacture|

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PCT/SE2013/050759| WO2014003645A1|2012-06-29|2013-06-24|A bread-knife blade and a method for its manufacture|

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US14/409,174| US20150143971A1|2012-06-29|2013-06-24|Bread-Knife Blade and a Method for Its Manufacture|