Method and device for grinding a saw chain
View Patent ↗A method and device for grinding a saw chain ( 26 ), the saw chain ( 26 ) being clamped in a position suitable for grinding. A rotating grinding disc ( 11 ) is manually transferred from an inactive position to an active position. Grinding of a cutter link ( 39 ) of the saw chain ( 26 ) is effected when the grinding disc ( 11 ) has assumed its active position. Further, the transfer of the grinding disc ( 11 ) from the inactive position to the active position is effected by a rectilinear movement that is carried out by rolling contact.
1. Method for grinding a saw chain ( 26 ), comprising steps of:
clamping said saw chain ( 26 ) in a position suitable for grinding,
manually transferring a rotating grinding disc ( 11 ) from an inactive position to an active position, and
effecting grinding of a cutter link ( 39 ) of the saw chain ( 26 ) when the grinding disc ( 11 ) has assumed an active position,
wherein the transfer of the grinding disc ( 11 ) from an inactive position to an active position is effected by means of a rectilinear movement of the centre of rotation ( 8 ) of the grinding disc ( 11 ), and wherein the rectilinear movement is carried out by rolling contact between a supporting means ( 5 ) and a guide ( 1 ).
2. Method according to claim 1 , wherein the clamping of the chain ( 26 ) is effected before the grinding disc ( 11 ) has assumed its active position.
3. Method according to claim 1 or 2 , wherein the manual transfer of the grinding disc ( 11 ) from an inactive to an active position automatically generates a clamping of the saw chain ( 26 ).
4. Device for grinding a saw chain, said device comprising means ( 25 ) for clamping the saw chain ( 26 ) in a position suitable for grinding, a rotatable grinding disc ( 11 ) and means for manually transferring the grinding disc ( 11 ) from an inactive position to an active position, wherein grinding of a cutter link ( 39 ) of the saw chain ( 26 ) is performed, the device further comprising a guide ( 1 ), a carriage ( 5 ) displaceable along the guide ( 1 ), said carriage ( 5 ) supporting the grinding disc ( 11 ), rotatable means between the guide ( 1 ) and the carriage ( 5 ) being designed in such a way that the carriage ( 5 ) moves rectilinear along the guide ( 1 ), wherein the rotatable means ( 7 ) are provided to abut the guide ( 1 ) in order to establish a rolling contact when the carriage ( 5 ) is displaced relative to the guide ( 1 ).
5. Device according to claim 4 , wherein the guide ( 1 ) is equipped with external grooves ( 3 ) on opposite sides of the guide ( 1 ), and that the rotatable means ( 7 ) are received in the grooves ( 3 ).
6. Device according to claim 5 , wherein the rotatable means constitute ball bearings ( 7 ).
7. Device according to any of the claims 4 - 6 , wherein the means for manually transferring the grinding disc ( 11 ) from an inactive position to an active position comprise a link system ( 13 , 15 ) that is pivotally connected to the guide ( 1 ), and a control handle ( 22 ) that is intended to be manually activated by an operator.
8. Device according to claim 7 , wherein the means ( 25 ) for clamping the saw chain ( 26 ) comprise a wire ( 31 ) that is arranged in such a way that when the wire ( 31 ) is subjected to a force in a predetermined direction along the wire ( 31 ) two chain rulers ( 29 ) of the clamping means are urged towards each other thereby effecting a clamping of a drive link ( 38 ) of the saw chain ( 26 ) between the chain rulers ( 29 ).
9. Device according to claim 6 , wherein the means ( 25 ) for clamping the saw chain ( 26 ) comprise a wire ( 31 ) that is arranged in such a way that when the wire ( 31 ) is subjected to a force in a predetermined direction along the wire ( 31 ) two chain rulers ( 29 ) of the clamping means are urged towards each other thereby effecting a clamping of a drive link ( 38 ) of the saw chain ( 26 ) between the chain rulers ( 29 ).
10. Device according to claim 5 , wherein the means ( 25 ) for clamping the saw chain ( 26 ) comprise a wire ( 31 ) that is arranged in such a way that when the wire ( 31 ) is subjected to a force in a predetermined direction along the wire ( 31 ) two chain rulers ( 29 ) of the clamping means are urged towards each other thereby effecting a clamping of a drive link ( 38 ) of the saw chain ( 26 ) between the chain rulers ( 29 ).
11. Device according to claim 4 , wherein the means ( 25 ) for clamping the saw chain ( 26 ) comprise a wire ( 31 ) that is arranged in such a way that when the wire ( 31 ) is subjected to a force in a predetermined direction along the wire ( 31 ) two chain rulers ( 29 ) of the clamping means are urged towards each other thereby effecting a clamping of a drive link ( 38 ) of the saw chain ( 26 ) between the chain rulers ( 29 ).
12. Device according to claim 11 , wherein an abutment ( 34 ) is provided at an end of the wire ( 31 ) that is located adjacent to the chain rulers ( 29 ), that the wire ( 31 ) extends through the chain rulers ( 29 ), and that the wire ( 31 ) is connected to a second link ( 15 ) that is part of the means for transferring the grinding disc ( 11 ) from an inactive to an active position.
13. Device according to claim 12 , wherein the wire ( 31 ) is resiliently connected to the second link ( 15 ), via a pressure spring ( 37 ).