A grinding angle setting device, a grinding system and a method of setting a grinding angle

Abstract

This disclosure presents a grinding angle setting device ( 100 ) for cooperative use with a grinding machine ( 200 ). The grinding machine ( 200 ) comprises a grinding means ( 210 ) and a support means ( 220 ) for supporting a grinding jig ( 1 ) holding a blade ( 300 ) to be grinded. The grinding angle setting device ( 100 ) comprises a first surface ( 111 ) that is configured to be brought in contact with the support means ( 220 ), a second surface ( 121 ) that is configured to be brought in contact with the grinding means ( 210 ), and an indicating means ( 130 ) for indicating the grinding angle (a) that corresponds to the current position of the adjustable support means ( 220 ) in relation to the grinding means ( 210 ). There is further presented a grinding system and a method ( 400 ) of setting a grinding angle.

1 . A grinding angle setting device for cooperative use with a grinding machine, the grinding machine comprising a grinder and support for supporting a grinding jig holding a blade to be grinded, the support configured to be adjustable in relation to the grinder to set a grinding angle, wherein the grinding angle setting device comprises:
 a first surface that is configured to be brought in contact with the support,   a second surface that is configured to be brought in contact with the grinder, and   an indicator for indicating the grinding angle that corresponds to a current position of the support means in relation to the grinder when the first surface is brought in contact with the support means and the second surface is brought in contact with the grinder grinding means.   
     
     
         2 . The grinding angle setting device of  claim 1 , comprising a first part on which the first surface is positioned and a second part on which the second surface is positioned, wherein the first and second parts are pivotally connected to one another around a pivot axis. 
     
     
         3 . The grinding angle setting device of  claim 2 , wherein the first and second parts are pivotally connected to one another by a hinge joint comprising a bearing pin that is rotatably journalled in a bushing. 
     
     
         4 . The grinding angle setting device of  claim 3 , wherein the first part comprises the bushing and the second part comprises the bearing pin. 
     
     
         5 . The grinding angle setting device of  claim 1 , comprising a blade receiving surface configured to receive the blade when held by the grinding jig, the blade receiving surface comprising an angle. 
     
     
         6 . The grinding angle setting device of  claim 5 , wherein the blade receiving surface comprises a length to stably support the blade, the length of the blade receiving surface being at least 25 mm. 
     
     
         7 . The grinding angle setting device of  claim 5 , wherein the blade receiving surface coincides with a pivot axis. 
     
     
         8 . The grinding angle setting device of  claim 3 , wherein the bearing pin comprises a blade receiving surface. 
     
     
         9 . The grinding angle setting device of  claim 2 , wherein the indicator comprises a scale on the first or second part and an indicator on the other one of the first and second part. 
     
     
         10 . The grinding angle setting device of  claim 9 , wherein the indicator indicating means is located closer to the first surface than to the second surface. 
     
     
         11 . The grinding angle setting device of  claim 2 , wherein the grinding angle setting device is configured such that a distance between the first surface and the second surface is adjustable. 
     
     
         12 . The grinding angle setting device of  claim 11 , wherein a length of the first part is adjustable. 
     
     
         13 . The grinding angle setting device of  claim 12 , wherein the first part comprises an extendable arm on which the first surface is positioned. 
     
     
         14 . The grinding angle setting device of  claim 1 , wherein the first surface is shaped to at least partially surround the support such that the grinding angle setting device is suspended on the support, the first surface being U-shaped. 
     
     
         15 . The grinding angle setting device of  claim 1 , wherein the second surface is configured to be aligned with the grinder by the second surface comprising two contact points that are separated along a circumference of the grinder. 
     
     
         16 . A grinding system, comprising:
 a grinding jig for holding a blade to be grinded,   a grinding machine comprising the grinder and the support for supporting the grinding jig, the support configured to be adjustable in relation to the grinder to set the grinding angle, and   the grinding angle setting device of  claim 1 .   
     
     
         17 . The grinding system of  claim 16 , wherein the grinding machine comprises a linear adjuster for straight, linear adjustment of the support in relation to the grinder. 
     
     
         18 . The grinding system of  claim 16 , wherein the grinding jig comprises:
 a first and a second clamp portion that are movable with respect to one another to clamp the blade, and   an elongate support portion configured to support the grinding jig onto the support of the grinding machine, the elongate support portion comprising a first support leg carrying the first clamp portion and a second support leg carrying the second clamp portion,   wherein the elongate support portion extends along a longitudinal center axis of the grinding jig and comprises a radial abutment surface for abutment against the support of the grinding machine, and   the first and second support legs of the support portion are fixed to one another at the radial abutment surface.   
     
     
         19 . A method of setting a grinding angle for grinding a blade held by a grinding jig using a grinding machine having a grinder and a support for supporting the grinding jig, the support configured to be adjustable in relation to the grinder to set the grinding angle, and using the grinding angle setting device of  claim 1 , the method comprising:
 fastening the blade in the grinding jig,   bringing the first surface of the grinding angle setting device in contact with the support and the second surface of the grinding angle setting device in contact with the grinder,   aligning the second surface of the grinding angle setting device with the grinder,   obtaining a current grinding angle from the indicator of the grinding angle setting device, and   adjusting the support in relation to the grinder if the current grinding angle deviates from a desired grinding angle.   
     
     
         20 . The method of  claim 19 , further comprising adjusting a distance between the first surface and the second surface of the grinding angle setting device to the grinding jig and the blade held by the grinding jig.