Contaminated solution filtration apparatus and machining solution filtration apparatus for machining device

A contaminated solution filtration apparatus for use with a machine, comprising:

• means (32, 33) for conveying a sheet-like filter medium continuously, said sheet-like filter medium comprising an upper surface and a lower surface;
• means (39, 40, 41) for supplying a contaminated solution to the upper surface of said sheet-like filter medium so as to pass through said sheet-like filter medium and be filtered thereby and form a filtered solution;
• means (36) for receiving the filtered solution which has passed through said sheet-like filter medium;
• and
• means (37) for generating a difference in pressure between the upper surface and the lower surface of said sheet-like filter medium, said generating means being connected to said receiving means, further including a second machining solution filter (7) which comprises:
• double-tubularly arranged inner and outer perforated metal housings (15, 16) having a multiplicity of machining solution passing holes (17) on their sidewall surface;
• and
• an additional filter medium (18) being interposed between said double-tubularly arranged inner and outer perforated metal housings,
• in which said contaminated solution is introduced into said additional filter medium (18) while being passed through the machining solution passing holes (17) of said inner perforated metal housing (15), filtered by said additional filter medium (18), and discharged from the machining solution passing holes (17) of the outer perforated metal housing (16).

A contaminated solution filtration apparatus for use with a machine, comprising:

• means (32, 33) for conveying a sheet-like filter medium continuously, said sheet-like filter medium comprising an upper surface and a lower surface;
• means (39, 40, 41) for supplying a contaminated solution to the upper surface of said sheet-like filter medium so as to pass through said sheet-like filter medium and be filtered thereby and form a filtered solution;
• means (36) for receiving the filtered solution which has passed through said sheet-like filter medium;
• and
• means (37) for generating a difference in pressure between the upper surface and the lower surface of said sheet-like filter medium, said generating means being connected to said receiving means, further comprising:
• condition responsive means (56, 58, 59, 65, 66a, 66b) for automatically detecting a presence or an absence of said sheet-like filter medium over said means for receiving.

A contaminated solution filtration apparatus for use with a machine, comprising:

• means (32, 33) for conveying a sheet-like filter medium continuously, said sheet-like filter medium comprising an upper surface and a lower surface;
• means (39, 40, 41) for supplying a contaminated solution to the upper surface of said sheet-like filter medium so as to pass through said sheet-like filter medium and be filtered thereby and form a filtered solution;
• means (36) for receiving the filtered solution which has passed through said sheet-like filter medium;
• and
• means (37) for generating a difference in pressure between the upper surface and the lower surface of said sheet-like filter medium, said generating means being connected to said receiving means, further comprising:
• condition responsive means (61,62) for automatically detecting a total amount of said sheet-like filter medium which remains to be conveyed.

A contaminated solution filtration apparatus for use with a machine, comprising:

• means (32, 33) for conveying a sheet-like filter medium continuously, said sheet-like filter medium comprising an upper surface and a lower surface;
• means (39, 40, 41) for supplying a contaminated solution to the upper surface of said sheet-like filter medium so as to pass through said sheet-like filter medium and be filtered thereby and form a filtered solution;
• means (36) for receiving the filtered solution which has passed through said sheet-like filter medium;
• and
• means (37) for generating a difference in pressure between the upper surface and the lower surface of said sheet-like filter medium, said generating means being connected to said receiving means, wherein said conveying means includes a variable-speed motor (33, 33a) and an automatic controller means (56, 70) for controlling a conveying speed of said sheet-like filter medium (31).