Electrical control system and method for a tire building machine server

A circuit for controlling the position of a material on a conveyor relative to a locus of points of an elastic material on the surface of a building drum having a drum rotation drive motor, the conveyor having both longitudinal and transverse reference axes and a conveyor drive motor, comprising:

• first sensor means for generating an output signal indicative of the position of the material relative to the transverse reference axis and the direction of any motion thereof;
• second sensor means for generating an output signal indicative of the position of the locus of points of the elastic material on the surface of the building drum and the direction of any rotation thereof;
• ratio means including rate multiplier means for receiving said output signals from one of said first or said second sensor means and generating an output signal in a preselected proportion thereto;
• and,
• tracking error correction means for receiving said output signal from said ratio means and providing an output signal to the conveyor drive motor whereby the conveyor drive motor maintains the desired position of the material relative to the transverse reference axis and the locus of points of the elastic material on the surface of the building drum.

A method for controlling the position of a material on a conveyor relative to a locus of points of an elastic material on the surface of a building drum having a drum rotation drive motor, the conveyor having both longitudinal and transverse reference axes, a conveyor position drive motor and conveyor drive motor, comprising the steps of:

• generating a first output signal indicative of a position of the material relative to the transverse reference axis and the direction of any motion thereof;
• generating a second output signal indicative of the position of the locus of points of the elastic material on the surface of the building drum and the direction of any rotation thereof;
• generating a pulse train output signal having a number of pulses that is indicative of the position of the material relative to the longitudinal reference axis;
• multiplying one of said first or said second output signals by a preselected ratio;
• providing an output signal in proportion to said multiplied output signal to the conveyor drive motor whereby the conveyor drive motor maintains the desired position of the material relative to the transverse reference axis and the locus of points of the elastic material on the surface of the building drum;
• counting in a first counter from a first preselected number for a count proportional to the number of pulses in said pulse train output signal, the final number in said first counter indicative of the necessary correction in the position of the material to maintain a preselected position relative to the longitudinal reference axis;
• and,
• generating an output signal proportional to said final number to be received by the conveyor position drive motor whereby the necessary correction to return the material to its preselected position relative to the longitudinal reference axis is achieved.

A method for controlling the position of a material on a conveyor relative to a locus of points of an elastic material on the surface of a building drum having a drum rotation drive motor, the conveyor having both longitudinal and transverse reference axes and a conveyor drive motor, comprising the steps of:

• generating a first output signal indicative of the position of the material relative to the transverse reference axis and the direction of any motion thereof;
• generating a second output signal indicative of the position of the locus of points of the elastic material on the surface of the building drum and the direction of any rotation thereof;
• multiplying one of said first or said second output signals by a preselected ratio;
• and,
• providing an output signal in proportion to said multiplied output signal to the conveyor drive motor whereby the conveyor drive motor maintains the desired position of the material relative to the transverse reference axis and the locus of points of the elastic material on the surface of the building drum.