Apparatuses for manufacturing glass and methods of managing pulling forces applied to glass ribbon

A glass manufacturing apparatus for producing glass ribbon comprising:

• a draw apparatus for receiving a glass ribbon and drawing the glass ribbon, wherein the draw apparatus includes a plurality of stub roller pairs, each stub roller pair including:
• a front-side stub roller coupled to a front-side motor and positioned proximate to an edge of the glass ribbon;
• and
• a rear-side stub roller coupled to a rear-side motor and positioned proximate to the edge of the glass ribbon such that the front-side stub roller and the rear-side stub roller are positioned along opposite sides of the glass ribbon and the front-side stub roller and the rear-side stub roller contact the glass ribbon;
• and
• at least one electronic controller communicatively coupled to the front-side motor and the rear-side motor of each of the stub roller pairs, the electronic controller comprising a processor and a memory for storing computer readable instructions such that, when the computer readable instruction set is executed by the processor, the at least one electronic controller:
• receives a front-side instantaneous drive torque signal indicative of a front-side drive torque applied by the front side stub roller to the glass ribbon, wherein the front side instantaneous drive torque signal is based on an electrical current directed to the front-side motor coupled to the front side stub roller;
• receives a rear-side instantaneous drive torque signal indicative of a rear-side drive torque applied by the rear-side stub roller to the glass ribbon, wherein the rear side instantaneous drive torque signal is based on an electrical current directed to the rear-side motor coupled to the rear-side stub roller;
• calculates a front-side average pulling force of the glass ribbon corresponding to a first time period of at least one rotation of the front-side stub roller;
• calculates a rear-side average pulling force of the glass ribbon corresponding to a second time period of at least one rotation of the rear-side stub roller;
• and
• compares the front-side average pulling force to the rear-side average pulling force to establish a pulling force differential between the front-side average pulling force and the rear-side average pulling force.