Device for manufacturing multiple needle recording electrode

A device for forming an electrode comb having two rows of needle-shaped recording electrodes with each row connected to a separate circuit board, said circuit boards and rows being encapsulated in a molded body of resin having a rib with a recording edge along one edge of the body with the two rows of electrodes extending to the outer surface of the recording edge with the electrodes of one row being offset from the electrodes of the other row by an amount equal to one-half of the spacing between the electrodes of each row, said device comprising a mold being composed of two symmetrically constructed halves with a rectangular cross-section, each half having a first face with a flat planar surface, a second face opposite the first face having a first recess for receiving a circuit board and a second recess separated from the first recess by a support surface, third and fourth faces extending between the first and second faces, each of said third and fourth faces having a recess adjacent the first face, the third face having means for clamping a wire to a surface thereof;

• means for holding the two halves with said first surfaces engaging each other to form a parting plane with the second faces being faced in an opposite direction to form a winding core, which receives a circuit board in each of the first recesses, and then has a wire wound around the core with equal spacing and pitch between the turns, after winding, the means for clamping holds the wound wire to each half while each turn of the wires are electrically connected to the circuit board and then severed adjacent the parting plane;
• and said mold including means for holding the two halves together with the, second faces adjacent each other to form a first mold cavity out of the first recesses and a second mold cavity from the second recesses with the two rows of wires extending therethrough and offset from each other so that after injecting a resin in said cavities, the second cavity forms the rib with the two rows of electrodes adjacent a body containing the circuit boards.