B - Operations – Transporting – 25 – B
Patent
B - Operations, Transporting
25
B
341/108.1
B25B 23/14 (2006.01) B25B 23/145 (2006.01)
Patent
CA 1105118
CONTROL SYSTEM FOR A MULTIPLE SPINDLE MACHINE ABSTRACT OF THE DISCLOSURE This disclosure deals with a machine for simultaneously tightening a plurality of threaded fasteners. The machine includes a plurality of torque applying units, one for each fastener, which engage and torque the fasteners. Each unit includes a spindle which engages the fastener and a torque sensing circuit which generates a torque signal representing the magnitude of the torque being applied. A torque control circuit of each unit prevents torquing to above a preset upper limit. A central control circuit receives the torque signals from all of the units, makes a comparison of torque values to identify any unit where the applied torque is greater than that of the other unit or units, and prevents such an identified unit from continuing to apply torque until the other unit or units applies torque essentially equal to that of the identified unit. The torque signals from the units may be averaged and the torque signal of each unit compared with the average. If only two units are provided, one torque signal may be compared with the other torque signal.
270790
Smart & Biggar
Thor Power Tool Company
LandOfFree
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