Abstract: An automatic coil winding and finishing machine. First and second bobbin conveying devices of the apparatus are capable of reciprocating on linear lines while holding coil bobbins, and of stopping the coil bobbins at predetermined positions. The first conveying devices allow the coil bobbins to be fed from a feeding device to a coil winding device and then to be discharged therefrom after the completion of the coil winding process. The second conveying device receives the coil bobbins from the first conveying device, and then allows them to be subjected to coil finishing processes in cooperation with devices for the coil finishing processes, as the coil bobbins remain held by the second conveying device. The intervals at which the conveying devices hold the coil bobbins may be determined in such a manner that the intervals are reduced when the coil bobbins are transformed from the first conveying device to the second conveying device.

Abstract: An automatic finishing system for a wound coil in a coil winding machine has a conveyor device for moving coil bobbins intermittently along a circulating endless path. Several finishing machines for carrying out different finishing steps are disposed within a limited space around the endless path. The conveyor device and the finishing machines are synchronously controlled by an electronic controller means. Each of the coil bobbins is held by a jig which is mounted on a movable jig-holder. A plurality of movable jig-holders are moved along one of two parallel guide rails and transferred to the other guide rail at each end of the guide rails to move along a substantially rectangular endless path.

Abstract: A tensioning device of a coil winding machine which provides back tension to a wire fed from a wire supply source to a coil winding position through a main tension pulley and a back tension lever which is urged in the back tension applying direction by a spring and is swingably supported. The tensioning device comprises a first back tension spring having one end connected with the back tension lever, a second back tension spring having one end connected to a fixed position of the device, the spring constant of the second back tension spring being smaller than that of the first back tension spring, and means for connecting the first and second back tension springs. A control member is further provided, which fixes the connecting means so that in a first operating mode only the first back tension spring acts on the back tension lever and in a second operating mode the first and second back tension springs operate in series to control the back tension lever.

Abstract: A magnetic tensioning device comprises a main tension pulley to which a braking torque is applied, an absorbing lever for absorbing fluctuation in tension and a second tension pulley mounted at one end of the absorbing lever. Adequate tensioning is obtained by means of the main and second tension pulleys. The braking torque is generated by a permanent magnet and a magnetizable disc opposed to each other. When tension is received at the absorbing lever, it displaces and the distance between the magnet and the magnetizable disc is changed according to the displacement of the lever to generate a correcting braking torque.

Abstract: A magnetic head for acoustic instruments. The head is composed of at least two units. Each unit, in turn, is composed of a shielding case half, a core holder, cores, etc. The core holder and/or the cores are easily positioned in the shielding case half at the time of assembly of the unit. The units are joined to each other to form a complete magnetic head.

Abstract: An electronic wristwatch having an improved digital display is provided. The display elements include first electrodes adapted to be referenced to a first potential and second electrodes spaced apart from said first electrodes and adapted to be charged to at least two distinct potentials. An oxidation-reduction sensitive compound is disposed between said first and second spaced apart electrodes the compound being reduced to a first condition of transparency in response to a first difference in potential between said first and second electrodes and being oxidized to a second condition of transparency in response to a second difference in potential between said first and second electrodes. Novel circuitry is utilized to incorporate the digital display in an electronic wristwatch.

Abstract: A battery charging circuit for effecting efficient charging of a battery by a solar energy source is provided. A voltage detecting circuit is coupled in parallel with a battery for detecting each state of charge of same, the detecting circuit including a constant voltage element. Transistor by-pass circuitry includes first and second current path electrodes connected in parallel with the battery. The transistor by-pass circuitry further includes a third control electrode coupled to the detecting circuit, and in response to the state of charging of the battery detected thereby, respectively effects one of an increase and decrease in the current carried by said current path electrodes.