Belt sharpener

Abstract

A belt sharpener comprises a drive pulley, a belt tensioner, a contact roller, an idler pulley and an endless abrasive belt mounted for rotation between them. The belt sharpener also includes a primary and a secondary guides adapted to hold a blade at a desired angle with respect to the abrasive belt.

Claims

1. A belt sharpener comprising: a. a drive pulley, a belt tensioner, a contact roller and an idler pulley attached to a frame; and b. an endless abrasive belt mounted for rotation between the drive pulley, belt tensioner, contact roller and the idler pulley; and wherein said contact roller includes an outer layer made of elastically deformable material; and c. a primary guide adapted to hold a blade, and further adapted to move around a primary axis, thus ensuring the desired presentation angle of the blade to the abrasive belt, and wherein said primary axis located below the abrasive belt, is parallel to the surface of the belt and perpendicular to the direction of the motion of the belt, which comprises a left primary guide located to the left of the abrasive belt and the contact roller, and a right primary guide located to the right of the abrasive belt and the contact roller, said primary guide is connected to a primary angle selector; and d. a secondary guide adapted to hold a blade, and further adapted to move around a secondary axis, thus ensuring the desired presentation angle of the blade to the abrasive belt, and wherein said secondary axis located below the abrasive belt, is parallel to the surface of the belt and perpendicular to the direction of the motion of the belt, which comprises a left secondary guide located to the left of the abrasive belt, and a right secondary guide located to the right of the abrasive belt, said secondary guide is connected to a secondary angle selector, wherein said primary and secondary guides are connected by a mechanical connector.

2. The belt sharpener of claim 1, wherein said elastically deformable material is rubber.

3. The belt sharpener of claim 1, wherein said elastically deformable material is a polyurethane foam.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) Additional advantages and features of the invention are revealed in the claims and the following description of a preferred exemplary embodiments of the invention that is explained with reference to the drawings, in which:

(2) FIG. 1 is a perspective view of a belt sharpener according to an embodiment of the present invention;

(3) FIG. 2 is a section view of a blade sharpened by the belt sharpener of the present invention;

(4) FIG. 3 is another perspective view of a belt sharpener according to an embodiment of the present invention;

(5) FIG. 4 is yet another perspective view of a belt sharpener according to an embodiment of the present invention;

(6) FIG. 5 is a perspective view of a belt sharpener according to another embodiment of the present invention.

DETAILED DESCRIPTION OF THE INVENTION

(7) FIG. 1, FIG. 3, and FIG. 4 show a belt sharpener 100 constructed in accordance with an embodiment of the present invention. The belt sharpener 100 includes a base 114 and a vertical frame 115 attached to the base 114. The belt sharpener 100 further comprises a drive pulley 102, a belt tensioner 103, a contact roller 104, an idler pulley 105 and an endless abrasive belt 101 mounted for rotation between them. The drive pulley 102, belt tensioner 103, contact roller 104 and idler pulley 105 are attached to the frame 115.

(8) The drive pulley 102 is connected to an electric motor 113 and is responsible for the continuous movement of the abrasive belt 101. The contact roller 104 includes an outer layer 106 that coats the contact roller 104. The layer 106 is made of a suitable natural or synthetic material that can be elastically deformed when pressed by an external force (for example spongy or rubbery material).

(9) The belt sharpener 100 also includes a primary blade guide 107 with a primary blade stop 108 and a secondary blade guide 109 with a secondary blade stop 110.

(10) The primary guide 107 are comprised of a left primary guide 107a located to the left of the abrasive belt 101 and the contact roller 104, and a right primary guide 107b located to the right of the abrasive belt 101 and the contact roller 104. The primary blade guide 107 are adapted to move around a primary axis 116 which is parallel to and located below the surface of the abrasive belt 101, and perpendicular to the direction of the motion of the abrasive belt 101.

(11) The primary blade stop 108 is comprised of a left primary post 108a attached to the left primary guide 107a, near the primary axis 116, and a right primary post 108b attached to the right primary guide 107b, near the primary axis 116.

(12) The secondary guide 109 are comprised of a left secondary guide 109a located to the left of the abrasive belt 101, and a right secondary guide 109b located to the right of the abrasive belt 101. The secondary blade guide 109 are adapted to move around a secondary axis 117 which is parallel to and located below the surface of the abrasive belt 101, and perpendicular to the direction of the motion of the abrasive belt 101.

(13) The secondary blade stop 110 is comprised of a left secondary post 110a attached to the left secondary guide 109a, near the secondary axis 117, and a right secondary post 110b attached to the right secondary guide 109b, near the secondary axis 117.

(14) The guide 107, 109 are adapted to ensure the desired presentation angle of the blade 200 to the abrasive belt 101. The desired presentation angle of the blade 200 to the abrasive belt 101 may be adjusted by an angle selector 112, connected to the primary blade guide 107, and through a mechanical connector 111 to the secondary blade guide 109. This connection guarantees that the sharpening angle (set by the angle selector 112) remains the same for the primary 107 and for the secondary 109 blade guide.

(15) Another embodiment of the present invention is depicted in FIG. 5. In this embodiment, the angles of the primary 107 and the secondary 109 guide are adjusted separately, by a primary angle selector 112a and a secondary angle selector 112b respectively.

(16) During the first phase of the sharpening process, the blade 200 is placed on the primary guide 107 (with the cutting edge 203 superimposed on the primary axis 116), the primary bevel 202 of the blade 200 is pressed against the abrasive belt 101 and the contact roller 104. This pressure creates a local depression in the layer 106, located beneath the belt 101, thus causing the abrasive belt 101 to sharpen the primary bevel 202 to a concave shape.

(17) During the second phase of the sharpening process, the blade 200 is placed on the secondary guide 109 (with the cutting edge 203 superimposed on the secondary axis 117), and the secondary bevel 201 of the blade 200 is pressed against the abrasive belt 101 and sharpened to a convex shape.

(18) The sharpening of the primary bevel 202 provides a leaner form to the blade 200, thus aiding in (by reducing the amount of removed blade material) sharpening of the secondary bevel 201 to a convex shape.

(19) During the sharpening process, the abrasive belt 101 can be changed to different abrasive grits and materials by pressing the belt tensioner 103.

(20) Although different illustrative embodiments have been shown and described, a wide range of modification change and substitution is contemplated in the foregoing disclosure, and in some instances, some features of the embodiments may be employed without a corresponding use of other features. Accordingly, it is appropriate that the appended claims are construed broadly and in a manner consistent with the scope of the embodiments disclosed herein.