An adjusting device comprising: a fixed member (12, 200) comprising a first hole (28a, 202), and a window; a first plate connected to the fixed member (12, 200), the first plate having a first axial portion corresponding in position to the window of the fixed member (12, 200); a second plate connected to the fixed member (12, 200), wherein the second plate has a first contact portion and a second contact portion, wherein the first contact portion corresponds in position to the first hole (28a, 202) of the fixed member (12, 200), and the second contact portion corresponds in position to the window of the fixed member (12, 200); a first adjusting member comprising an adjusting portion and an eccentric portion connected to the adjusting portion, the adjusting portion contacting against the second contact portion of the second plate, the eccentric portion extending through the window of the fixed member (12, 200) and being movably connected to the first axial portion of the first plate; and a first locking member having a portion which extends sequentially through the first contact portion of the second plate and the first hole (28a, 202) of the fixed member (12, 200) and is connected to the first plate; wherein the second plate is displaceable relative to the fixed member (12, 200) in response to displacement of the first adjusting member, characterized by a second adjusting member connected to the fixed member (12, 200) and the first plate, wherein the fixed member (12, 200) has a longitudinal hole, the first plate has a second axial portion, and the second adjusting member comprises an adjusting portion and an eccentric portion connected to the adjusting portion, the adjusting portion of the second adjusting member contacting against a hole wall of the longitudinal hole of the fixed member (12, 200), the eccentric portion of the second adjusting member being movably connected to the second axial portion of the first plate, the first plate being displaceable relative to the fixed member (12, 200) in response to displacement of the second adjusting member so as to displace the first locking member relative to the fixed member (12, 200), causing the second plate to displace relative to the fixed member (12, 200) in response to displacement of the first locking member. a fixed member (12, 200) comprising a first hole (28a, 202), and a window; a first plate connected to the fixed member (12, 200), the first plate having a first axial portion corresponding in position to the window of the fixed member (12, 200); a second plate connected to the fixed member (12, 200), wherein the second plate has a first contact portion and a second contact portion, wherein the first contact portion corresponds in position to the first hole (28a, 202) of the fixed member (12, 200), and the second contact portion corresponds in position to the window of the fixed member (12, 200); a first adjusting member comprising an adjusting portion and an eccentric portion connected to the adjusting portion, the adjusting portion contacting against the second contact portion of the second plate, the eccentric portion extending through the window of the fixed member (12, 200) and being movably connected to the first axial portion of the first plate; and a first locking member having a portion which extends sequentially through the first contact portion of the second plate and the first hole (28a, 202) of the fixed member (12, 200) and is connected to the first plate; wherein the second plate is displaceable relative to the fixed member (12, 200) in response to displacement of the first adjusting member, characterized by a second adjusting member connected to the fixed member (12, 200) and the first plate, wherein the fixed member (12, 200) has a longitudinal hole, the first plate has a second axial portion, and the second adjusting member comprises an adjusting portion and an eccentric portion connected to the adjusting portion, the adjusting portion of the second adjusting member contacting against a hole wall of the longitudinal hole of the fixed member (12, 200), the eccentric portion of the second adjusting member being movably connected to the second axial portion of the first plate, the first plate being displaceable relative to the fixed member (12, 200) in response to displacement of the second adjusting member so as to displace the first locking member relative to the fixed member (12, 200), causing the second plate to displace relative to the fixed member (12, 200) in response to displacement of the first locking member.