Electric actuating device
AssigneePortescap
InventorsMarc Heyraud, Andre Martin
Life of this patent
Estimating the term…
Abstract
A printing device for chronocomparators comprising a striker, an ironless cylindrical coil mounted for rotation in an air gap of a magnetic circuit and connected to the striker, the magnetic circuit being formed by a permanent magnet placed inside the coil and an outer part of magnetically permeable material surrounding the coil. The coil is connected through spiral springs to a source of electric control pulses. The spiral springs provide a return force for bringing the coil back to a rest position in the absence of a control pulse. A cylinder with a helical rib is placed to be stricken by the striker and a recording strip is inserted between the striker and the said cylinder.
Claims5
A printing device for a chronocomparator, comprising a striker, an ironless coil mounted for rotation in the air gap of a magnetic circuit and electrically connected to a source of control pulses, said coil being part of a cup shaped rotor and comprising a self supporting cylindrical winding fixed at its one end onto a supporting disk, said magnetic circuit comprising a permanent magnet placed inside the coil and a soft iron cylindric outer part surrounding the coil, the poles of the magnetic circuit and the coil being arranged for producing a torque upon occurrence of a control pulse, means for connecting the striker to the coil, means for providing a return torque for bringing the coil back to a rest position in the absence of a control pulse, said means for providing a return torque including two return springs electrically connected between the ends of the coil and the source of control pulses, a cylinder with a helical rib placed to be stricken by the stricker, and a recording strip inserted between the stricker and the said cylinder.
A printing device for a chronocomparator, comprising a striker, an ironless coil mounted for rotation in the air gap of a magnetic circuit and electrically connected to a source of control pulses, the poles of the magnetic circuit and the coil being arranged for producing a torque upon occurrence of a control pulse, means for connecting the striker to the coil, magnetic return means for producing a return torque acting on the coil for bringing the same back into a rest position in the absence of a control pulse, said magnetic return means comprising a member of magnetically permeable material associated with the rotor for rotation therewith, at least a part of said member being arranged in eccentric relationship with the rotor axis, a cylinder with a helical rib placed to be striken by the striker, and a recording strip inserted between the striker and the said cylinder.
A printing device for a chronocomparator, comprising a striker, an ironless coil mounted for rotation in the air gap of a magnetic circuit and electrically connected to a source of control pulses, the poles of the magnetic circuit and the coil being arranged for producing a torque upon occurrence of a control pulse, means for connecting the striker to the coil, means for providing a return torque for bringing the coil back to a rest position in the absence of a control pulse, a cylinder with a helical rib placed to be stricken by the striker, a recording strip inserted between the striker and the said cylinder, and wherein said means for providing a return torque include at least one bar of magnetically permeable material, the said bar being arranged on the surface of the coil parallely to the axis thereof and for rotation therewith.
Dependencies are inferred from the claim text.