초록 ▼

A press that includes a pair of die sections and a ram for propelling one of the die sections against the other to form a workpiece positioned therebetween. A die cushion is coupled to one of the die sections for cushioning force of engagement of the die sections, and includes at least one gas cylin

A press that includes a pair of die sections and a ram for propelling one of the die sections against the other to form a workpiece positioned therebetween. A die cushion is coupled to one of the die sections for cushioning force of engagement of the die sections, and includes at least one gas cylinder and a manifold for feeding gas under pressure to the cylinder. A pressure monitor includes a pressure sensor coupled to the manifold for supplying an electrical pressure signal as a function of gas pressure in the manifold. The pressure signal as compared to a predetermined threshold for supplying an alarm signal when gas pressure in the manifold is less than such threshold, and ram operation is stopped when the manifold gas pressure is less than the preset threshold.

대표청구항 ▼

A pressure monitor for use in a press that includes a pair of die sections, a ram for propelling one of said die sections against the other for forming a workplace positioned therebetween, and a die cushion coupled to one of said die sections for cushioning force of engagement of said die sections,

A pressure monitor for use in a press that includes a pair of die sections, a ram for propelling one of said die sections against the other for forming a workplace positioned therebetween, and a die cushion coupled to one of said die sections for cushioning force of engagement of said die sections, said die cushion including at least one gas cylinder coupled to said one section and a manifold for feeding gas under pressure to said cylinder, said pressure monitor comprising: a pressure sensor coupled to said manifold for supplying an electrical pressure signal as a function of gas pressure in said manifold, means for comparing said pressure signal to a predetermined threshold for supplying an alarm signal when gas pressure in said manifold is less than said threshold, and means coupled to said ram and responsive to said alarm signal for disabling operation of said ram.