Correction device for the rolling type tension on a gear grinding machine

A correction device for the rolling tape tension on a gear grinding machine, especially a form grinding machine for spur and helical cylindrical gears, comprising:

• tapes subjected to an initial basic tension at rest;
• a rolling block to which one end of each of the tapes is attached;
• said rolling block and said tapes coacting with one another such that a relative rolling action occurs therebetween;
• a tape stand mounted to be movable to-and-fro at which the other end of each of the tapes is attached;
• said mounting means including intermediate pieces defining tape clamps at which the other end of said tapes are attached, said intermediate pieces being carried by said tape stand;
• means for imposing an additional torque on the rolling block and cooperating with said intermediate pieces;
• gauging means for measuring the tension in the rolling tapes and for comparing the same with the initial basic tension at rest;
• said gauging means, in the event of a decrease in the tension of the tapes relative to the initial tension on one side of the rolling block actuating said torque imposing means to produce an additional torque on the opposite side of said rolling block until the measured tension on the one side of the rolling block again attains the level of the initial tension.