An automatic toroidal core winding machine, including: a frame, control device, clamping and wire arranging mechanism, winding mechanism, wire delivering mechanism, feeding mechanism, automatic stripping mechanism and wire reclaiming device for reclaiming excessive wires around the shuttle, the winding mechanism including a shuttle and driving device for supporting and driving the shuttle to rotate, the shuttle includes a slider and wire storage and hooking aperture, and the frame includes a detecting and positioning mechanism used for positioning the ring opening, the slider and the wire storage and hooking aperture of the shuttle, and a wire hanging device for hanging the wire allowing the shuttle to store and wind the wire. The machine achieves automation from wire delivery, feeding, shuttle opening to wire hanging, wire winding, wire cutting, product taking and wire reclaiming with significantly improved production efficiency, reduced restriction and effect on the quality of winding from manual proficiency.

A nozzle turning apparatus includes a nozzle unit that has a nozzle for sending out a wire from a tip end thereof and a nozzle holder for holding the nozzle, the nozzle unit rotatably supporting the nozzle holder, and a nozzle-holder drive member integrally provided with the nozzle unit and moved in the nozzle unit to rotate the nozzle holder. The nozzle-holder drive member is driven to turn the nozzle from a winding state to a wire processing state after a winding operation is finished. Particularly, according to the present invention, the nozzle turning apparatus includes inner unit-drive means integrally provided with the nozzle unit in the nozzle unit, for moving the nozzle-holder drive member, and outer unit-drive means independently provided from the nozzle unit outside the nozzle unit, for driving the inner unit-drive means so as to move the nozzle-holder drive member.

A coil unit may include coil holding member configured to hold a coil; and a coil held by the coil holding member and formed by a conducting wire in a wound state. A direction perpendicular to a length direction of the conducting wire is a thickness direction of the coil. The coil holding member may include an abutment surface configured to abut against one end surface in the thickness direction of the coil, a convex unit protruding from the abutment surface and around which the conducting wire is wound, and a coil pressing unit extending from a front end surface of the convex unit and configured to press the other end surface in the thickness direction of the coil.

A coil unit may include coil holding member configured to hold a coil; and a coil held by the coil holding member and formed by a conducting wire in a wound state. A direction perpendicular to a length direction of the conducting wire is a thickness direction of the coil. The coil holding member may include an abutment surface configured to abut against one end surface in the thickness direction of the coil, a convex unit protruding from the abutment surface and around which the conducting wire is wound, and a coil pressing unit extending from a front end surface of the convex unit and configured to press the other end surface in the thickness direction of the coil.

A current transformer includes first and second bobbins, and a secondary winding. The first bobbin includes a first tube defining a first longitudinal axis. First and second flanges are disposed on first and second ends of the first tube. The first tube, the first and second flanges collectively define a first slit along the first longitudinal axis. The first slit allows receipt of a primary conductor into the first tube. The second bobbin includes a second tube rotatably received about the first tube. The second tube defines a second slit along the second longitudinal axis. The second slit allows receipt of the primary conductor into the first and second tubes. The secondary winding is wound about the first bobbin and extends along the first longitudinal axis, passing through the first tube and over the first and second flanges. The second tube rotates about the second longitudinal axis relative to the first tube.

A current transformer includes first and second bobbins, and a secondary winding. The first bobbin includes a first tube defining a first longitudinal axis. First and second flanges are disposed on first and second ends of the first tube. The first tube, the first and second flanges collectively define a first slit along the first longitudinal axis. The first slit allows receipt of a primary conductor into the first tube. The second bobbin includes a second tube rotatably received about the first tube. The second tube defines a second slit along the second longitudinal axis. The second slit allows receipt of the primary conductor into the first and second tubes. The secondary winding is wound about the first bobbin and extends along the first longitudinal axis, passing through the first tube and over the first and second flanges. The second tube rotates about the second longitudinal axis relative to the first tube.

A coil unit may include an even number of coils comprising a first coil and a second coil; and a coil holding member which holds the even number of the coils. An outer peripheral face of the coil holding member may include a side-face pair comprising a first side face and a second side face which are substantially parallel to each other. The first side face may be formed with a first protruded part around which the first coil is wound, the first protruded part being protruded to an outer peripheral side with respect to the coil holding member. The second side face may be formed with a second protruded part around which the second coil is wound, the second protruded part being protruded to an outer peripheral side with respect to the coil holding member. The first coil and the second coil may be structured from one conducting wire.

A coil unit may include an even number of coils comprising a first coil and a second coil; and a coil holding member which holds the even number of the coils. An outer peripheral face of the coil holding member may include a side-face pair comprising a first side face and a second side face which are substantially parallel to each other. The first side face may be formed with a first protruded part around which the first coil is wound, the first protruded part being protruded to an outer peripheral side with respect to the coil holding member. The second side face may be formed with a second protruded part around which the second coil is wound, the second protruded part being protruded to an outer peripheral side with respect to the coil holding member. The first coil and the second coil may be structured from one conducting wire.

A method of manufacturing a coil for a torque sensor includes: holding a bobbin with a jig, the bobbin being formed in a cylindrical shape and provided with first inclined grooves and second inclined grooves on a cylindrical outer peripheral surface of the bobbin, the first inclined grooves being inclined at a preset specified angle with respect to an axial direction of the cylindrical shape, and the second inclined grooves being inclined at the specified angle with respect to the axial direction in a direction opposite to the first inclined grooves; and rotating the bobbin while simultaneously supplying insulated wires from nozzles arranged to surround the bobbin, and driving the nozzles in a direction orthogonal to a rotation direction of the bobbin so as to wind the insulated wires around the bobbin along the first inclined grooves or the second inclined grooves.

A method of manufacturing a coil for a torque sensor includes: holding a bobbin with a jig, the bobbin being formed in a cylindrical shape and provided with first inclined grooves and second inclined grooves on a cylindrical outer peripheral surface of the bobbin, the first inclined grooves being inclined at a preset specified angle with respect to an axial direction of the cylindrical shape, and the second inclined grooves being inclined at the specified angle with respect to the axial direction in a direction opposite to the first inclined grooves; and rotating the bobbin while simultaneously supplying insulated wires from nozzles arranged to surround the bobbin, and driving the nozzles in a direction orthogonal to a rotation direction of the bobbin so as to wind the insulated wires around the bobbin along the first inclined grooves or the second inclined grooves.