| 摘要 |
A fluid pressure actuated device for use with material splitting machines of the type described, the device comprising a cylinder, a double acting piston movable in the cylinder by pressurized fluid, the piston being operatively connectable to the pressure roller of the machine for, in use, effecting withdrawal of the pressure roller from a cutting plane in response to movement of the piston from a first extreme position towards a second extreme position, said cylinder having first and second ports communicating with opposite ends of the piston and arranged so that in use pressurized fluid applied to the first port while the second port is connected to exhaust will cause the piston to move from said first extreme position to said second extreme position so as to effect maximum withdrawal of the pressure roller to permit cleaning of the scrapers and the cutting region, and a third port between the first and second ports and arranged so that in use pressurized fluid applied to the first port while the third port only is connected to exhaust will cause the piston to move from said first extreme position to a position between the first and second extreme positions so as to effect limited withdrawal of the pressure roller to permit insertion of the material.
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