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A rock drilling device comprising a feed beam (4), which has a drill end (41) from which the drill point protrudes at drilling and a rear end(42) opposite the drill end; a rock drilling machine (5) movable along the feed beam (4); a pressure cylinder (6), which is arranged in connection with the fee

A rock drilling device comprising a feed beam (4), which has a drill end (41) from which the drill point protrudes at drilling and a rear end(42) opposite the drill end; a rock drilling machine (5) movable along the feed beam (4); a pressure cylinder (6), which is arranged in connection with the feed beam (4) with one end (622) movable relative to the feed beam (4) and one end (611) fixedly arranged relative to the feed beam (4). The pressure cylinder (6) drives a feed line (51) for feeding the drilling machine (5) to and fro along the feed beam (4). The feed line (51) is routed over two outer sheaves (52, 53) that are arranged at each end (41, 42) of the feed beam (4) and a measuring device (7) for measuring the location of the drilling machine (5) relative to the feed beam (4) is arranged to the shaft (9) of one of the sheaves (52, 53) and the sheave and the shaft (9) are arranged such that they rotate together.

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1. Rock drilling device comprising a feed beam (4), which has a drill end (41) from which a drill point protrudes at drilling and a rear end (42) opposite said drill end; a rock drilling machine (5) movable along the feed beam (4); said rock drilling machine having a drill string comprising a plural

1. Rock drilling device comprising a feed beam (4), which has a drill end (41) from which a drill point protrudes at drilling and a rear end (42) opposite said drill end; a rock drilling machine (5) movable along the feed beam (4); said rock drilling machine having a drill string comprising a plurality of drill rods; a pressure cylinder (6), which is arranged in connection with the feed beam (4) with one end (622) movable relative to the feed beam (4) and one end (611) fixedly arranged relative to the feed beam (4); a feed line (51), which is driven by the pressure cylinder (6) and connected to the drilling machine (5) for feeding the drilling machine to and fro along the feed beam (4), characterized in that the feed line (51) is routed over two outer sheaves (52, 53) that are arranged at each end (41, 42) of the feed beam (4) and in that a measuring device (7) that measures a location of the drilling machine (5) relative to the feed beam (4) for measuring the depth of penetration of said drill point during drilling operations and which measures a location of the drilling machine (5) relative to the feed beam (4) during adjustment of a size of the drill string is arranged to the shaft (9) of one of the outer sheaves (52, 53) and that this sheave (52, 53) and the shaft (9) are arranged such that they rotate together, said drilling machine being coupled to a proximal end of said drill string so that said measuring device directly measures the location of said proximal end of said drill string relative to said feed beam. 2. Rock drilling device according to claim 1, characterized in that the measuring device (7) is arranged to the sheave (52) at the rear end (42) of the feed beam (4). 3. Rock drilling device according to claim 2, characterized in that the shaft (9) is carried in two bearings (92, 93) placed near its ends. 4. Rock drilling device according to claim 2, characterized in that the measuring device (7) is arranged on an extension (91) of the shaft (9). 5. Rock drilling device according to claim 2, characterized in that a second sheave (92) over which a second feed line passes is arranged on the same shaft (9). 6. Rock drilling device according to claim 2, characterized in that the measuring device (7) is shielded by a protection plate (8) and in that a cable (71) that leads from the measuring device passes through the protection plate (8). 7. Drill rig comprising a rock drilling device according to claim 2. 8. Rock drilling device according to claim 1, characterized in that the shaft (9) is carried in two bearings (92, 93) placed near its ends. 9. Rock drilling device according to claim 8, characterized in that the measuring device (7) is arranged on an extension (91) of the shaft (9). 10. Rock drilling device according to claim 8, characterized in that a second sheave (92) over which a second feed line passes is arranged on the same shaft (9). 11. Drill rig comprising a rock drilling device according to claim 8. 12. Rock drilling device according to claim 1, characterized in that the measuring device (7) is arranged on an extension (91) of the shaft (9). 13. Drill rig comprising a rock drilling device according to claim 12. 14. Rock drilling device according to claim 1, characterized in that a second sheave (92) over which a second feed line passes is arranged on the same shaft (9). 15. Rock drilling device according to claim 5, characterized in that the second sheave (92) is arranged to the shaft via a bearing (95) such that the second sheave rotates independently of the shaft (9). 16. Drill rig comprising a rock drilling device according to claim 15. 17. Drill rig comprising a rock drilling device according to claim 14. 18. Rock drilling device according to claim 1, characterized in that the measuring device (7) is shielded by a protection plate (8) and in that a cable (71) that leads from the measuring device passes through the protection plate (8). 19. Drill rig comprising a rock drilling device according to claim 18. 20. Drill rig comprising a rock drilling device according to claim 1.