Abstract: A tight end detector for tufting machines is disclosed which includes a modular switch bar assembly, a switch contact forming PC board thereon having a conductive stripe, insulating strip, a leaf-metal electrical contact member having parallel contact finger formations overlying the conductive stripe of the PC board and a thin cover layer overlying the bar, PC board, insulating strip, and electrical contact member to provide a wear surface against which yarn ends of the tufting machine may bear.

Abstract: Terminal trainer keyboard and display apparatus for teaching keyboard operations and knowledge items and skills, including a keyboard array of touch keys representing individual characters and keyboard operations each having a switch associated therewith, a visual projector to be located within view of the trainee having a viewing screen onto which lesson information is displayed projected from a training film having sensor activating code bars beside the film frames denoting the correct key location for the displayed lesson instruction. The keyboard includes a light emitter at each key for illuminating its associated key, and an electronic circuit is coupled to the switches and receives correct key location signals from the sensors detecting the code bars to activate correct and incorrect readout counters to indicate the number of correct and incorrect key activations and to activate the light emitter at the correct key location when a key at an incorrect location is activated.

Abstract: A yarn tension control apparatus for tensioning a running length of yarn such as textile yarns or the like, wherein a plurality of tensioning devices form a controlled channel and are controlled by an electronic control circuit having a manually adjustable tension setting potentiometer for adjusting a circuit to provide output voltages to the tension devices of the channel adding selecting tension values to the yarn. The tensioning devices each comprise an electromagnet coil and core structure alongside which a pair of wear surface members in the form of plates or discs are supported in parallel vertical planes with the yarn running between and engaging the confronting surfaces of the wear surface members and the wear surface member located beyond the yarn plane from the coil and core structure being of magnetic material to be drawn toward the companion wear member by magnetic attractive forces to vary the tensioning of the yarn leaving the yarn tension devices.

Abstract: Scheme and knowledge trainer apparatus for teaching trainees sortation scheme and knowledge items and skill for sorting such as mail sorting and the like, comprising an electronic sortation training console having a switch panel depicting plural horizontal rows and vertical columns of sort blocks symbolizing discrete sort locations each having a touch sensing switch and changeable indicia strips for providing the sort blocks with legends denoting sort location titles therefor. A visual projector is provided for receiving a training film having frames for successively displaying lesson information on a viewing screen depicting sort location legends correlated with the legends on the console blocks and having apparatus for producing correct location signals denoting the correct console sort block location for the displayed legends.

Abstract: A ball and funnel type yarn tension control apparatus for tensioning a running length of yarn such as textile yarn or the like, wherein a plurality of tensioning devices form a controlled channel and are controlled by an electronic control circuit having a manually adjustable tension setting potentiometer for adjusting a circuit to provide output voltages to the tension devices of the channel adding selecting tension values to the yarn. The tension control devices each comprise an electromagnet coil structure and associated core structure including pole pieces adjacent one or a pair of ball and funnel tensioning stations in each tension device to exert magnetic attractive forces on the ball member and vary tensioning of the yarn leaving the yarn tension device. Degaussing circuit means are also disclosed for applying intermittent negative going pulses to the electromagnet coils during downward adjustment of the tension setting potentiometer to minimize residual magnetic effects.