Patent ID: 6931738

Claim:
Device for alignment of a first component ( 1 ) and a second component ( 2 ) in a predetermined relation to each other, said components ( 1 . 2 ) consisting of power transmitting devices of the type chain propulsion or belt propulsion, comprising a transmitter unit ( 7 ) arranged for mounting on the peripheral edge ( 8 ) of said first component ( 1 ) and comprising a light source ( 9 ) for generation of light radiation ( 10 ) with a predetermined pattern in the direction towards a receiver unit ( 11 ; 11 ′; 22 , 27 ; 27 ′) arranged for mounting on the peripheral edge ( 12 ) of said second component ( 2 ), where the receiver unit ( 11 ; 11 ′) comprises a detector device ( 18 a , 18 b ; 18 a ′, 18 b ′; 23 a , 23 b ; 28 a , 28 b ; 28 ′ a , 28 ′ b ) for said light radiation ( 10 ) and wherein said detector device ( 18 a . 18 b ; 18 a ′, 18 b ′; 23 a , 23 b ; 28 a , 28 b ; 28 a ′, 28 b ′) comprises a first detector ( 18 a ; 18 a ′; 23 a , 28 a , 28 a ′) and a second detector ( 18 b ; 18 b ′; 23 b ; 28 b ; 28 b ′), respectively, which are separated depthwise in relation to said transmitter unit ( 7 ), characterized in, that: the first detector ( 18 a ; 18 a ′; 23 a ; 28 a ; 28 a ′) comprises a first target and a second target and that the second detector ( 18 b ; 18 b ′; 23 b ; 28 b ; 28 a ′) comprises a third target, that the first target and the second target surround the third target, that the first target and the second target are arranged along essentially the same plane, that said targets comprise markings ( 19 , 20 , 21 ; 24 , 25 , 26 ; 29 , 30 , 31 ) upon which said light radiation is intended to incide, and that said targets extend along essentially the same planes, which are generally perpendicular in relation to the direction of incidence of said light radiation.