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A control device of variable pitch vanes in a turbomachine is disclosed. The control device includes a ring surrounding a casing of the turbomachine and connected by links to the variable pitch vanes, and a jack connected to the ring in order to displace it in rotation around the casing. The jack is

A control device of variable pitch vanes in a turbomachine is disclosed. The control device includes a ring surrounding a casing of the turbomachine and connected by links to the variable pitch vanes, and a jack connected to the ring in order to displace it in rotation around the casing. The jack is mounted pivoting on the casing and its piston rod is connected to the ring by a connecting rod. The piston and connecting rods are articulated on an axis which is connected to the casing by a guiding device maintaining it at a substantially constant distance from the casing.

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1. A control device of variable pitch vanes in a turbomachine, comprising: a ring surrounding a casing of the turbomachine and connected by links to the variable pitch vanes; anda jack of which a piston rod is connected to the ring in order to displace the ring in rotation around the casing, the jac

1. A control device of variable pitch vanes in a turbomachine, comprising: a ring surrounding a casing of the turbomachine and connected by links to the variable pitch vanes; anda jack of which a piston rod is connected to the ring in order to displace the ring in rotation around the casing, the jack being mounted pivoting on the casing around a pivoting axis parallel to the axis of the casing,wherein the piston rod of the jack is connected to the ring by a connecting rod of which a first end is articulated on one end of the piston rod and a second end is articulated on the ring, around first and second axes of articulation parallel to the axis of the casing, the first axis of articulation of the end of the piston rod and of the first end of the connecting rod being guided in displacement by guiding means mounted on the casing in order to maintain the first axis of articulation at a substantially constant distance from the casing, andwherein the guiding means include a rigid arm of which one end bears the first axis of articulation of the end of the piston rod and of the first end of the connecting rod and of which the other end is mounted pivoting on the casing around an axis parallel to the axis of the casing. 2. The device set forth in claim 1, wherein the connecting rod is orientated tangentially in relation to the ring. 3. The device set forth in claim 1, wherein the piston rod and the first end of the connecting rod are mounted on the first axis of articulation by swiveling systems. 4. The device set forth in claim 1, wherein the second end of the connecting rod pivots on an axis borne by a stirrup of the ring. 5. The device set forth in claim 1, wherein the pivoting axis of the jack is borne by supporting means fixed on the casing, the supporting means including two parallel lugs between which is arranged a cylinder of the jack. 6. The device set forth in claim 5, wherein the lugs bear swiveling systems receiving the ends of the pivoting axis of the jack. 7. The device set forth in claim 1, wherein the jack is of the hydraulic, pneumatic, or electrical type. 8. A turbomachine compressor, comprising at least one device set forth in claim 1. 9. A turbomachine, comprising at least one device set forth in claim 1.