Patent GB-191511412-A (GB)
Title: Improvements in or relating to Spooling Machines specially applicable for the Winding of Coila for Electrical Apparatus.
IPC: H01F41/06
Filed: 1915-08-07
Abstract: 11,412. McGee & Son, W., and Walls, A. G. Aug. 7. [Cognate Application, 14,994/15.] Spooling - machines; creel arrangements; stop-motions. - Relates to the adaptation of an automatic spooling- machine of the Conant type to the winding of coils for electric purposes, such as magnetoarmatures. Means are provided for stopping the machine (a) at the completion of each layer to allow insulation to be wrapped round the coil, (b) when the wire ceases to unwind freely from the supply bobbin, (c) when a knot or joint occurs in the wire, (d) when the wire breaks or the supply gives out, and (e) when the insulation is faulty. The wire 44 is drawn from a bobbin 42 and passes over a guide-pulley 45, between adjustable fingers 46, and over a pulley 48 and another pulley 49 carried by a sensitive lever 50, to the traversing guide-pulley 13, which is controlled by the usual right and left handed screws, shaper-wheel and slidable shaper-fingers. The spindle of the shaper-wheel carries an indicator 16 to show the number of layers wound, and also a gear-wheel 17 which operates a large ratchet-wheel 18, advancing it one tooth for each layer. Each tooth, in passing a pin 19, operates a lever 20 and depresses the end 22 of a lever 23, thus lifting a catch 25 and releasing a spring-controlled knock-off slide, which controls the usual clutch pulley mechanism and stops the machine at the end of each layer. The zero of the indicator disk 16 is made adjustable to suit the number of layers, being wound where the outer layers are gradually shortened, and the graduated scale is rotatable relatively to the shaper-wheel. The shaper-wheel can be moved out of engagement with the usual traversing-fingers and can be rotated by a cord and weight until an adjustable stop arrests its movement. A revolution counter giving the number of turns wound is mounted on the headstock and driven from the spindle carrying the armature 14. If a wiremaker's joint occurs in the wire 44 and is caught between the adjustable fingers 46, or if the wire ceases to unwind freely, the tension in the wire is so increased that the lever 50 is drawn to one side and a bracket 51 closes a contact 52, 53 completing an electric circuit and energizing a magnet 54. This magnet draws down the lever 23 and stops the machine as described above. The circuit is broken by the movement of the knock-off slide. If the wire should break or run out, the lever 50 swings in the other direction and closes a contact 55, 56, completing the same electric circuit as before. The bobbin 42 is controlled by a brake drum on the spindle 43 and a brake lever 57, carried by a boss on a shaft 60 and pressed against the drum by an adjustable spring 66. The sensitive lever 50 is carried by a second boss 67 on this same shaft and is controlled by a spring 68. Should the tension in the wire increase, the arm 50 engages a pin on the boss of the brake lever 57 and releases the pressure, allowing the bobbin 42 to rotate more freely. This arrangement of sensitive lever compensates automatically for any variation of tension due to the winding of an irregularly-shaped coil. An alternative arrangement for stopping the machine under contingencies (b), (c), or (d) above comprises a sliding rod attached at one end to an arm on the lever 20 and supported at the other end by a cam-piece engaging a fixed roller. The rod carries hinged projections which are engaged by the end of the stud of the pulley 49 when the lever 50 is moved too far from its normal position. The cam-piece riding over the roller allows the rod to fall away and leaves the lever 50 free. To stop the machine when a fault occurs in the insulation, the bobbin spindle 43 is insulated from the frame and the inner end of the wire is connected to this spindle. The pulley 45 is also insulated from the frame and included in a circuit comprising the bobbin spindle, the wire being wound, and the electromagnet 54. When a fault occurs in the insulation of the wire passing over the pulley 45, the circuit is completed. The wire, as it passes over the pulley, may dip into an insulated mercury bath included in the circuit. A lever 82 is provided to rock the shaft 32 and depress the usual nuts engaging the traverse screws to allow the traverse guide to be moved back to the end of the longest traverse at the start of a new winding.