초록 ▼

A suction apparatus for a printing press includes a plurality of suction ports and air shutter devices. The suction ports suck and hold an object used for a printing operation. The air shutter devices are provided to the suction ports on at least one end portion side not used for a suction operation

A suction apparatus for a printing press includes a plurality of suction ports and air shutter devices. The suction ports suck and hold an object used for a printing operation. The air shutter devices are provided to the suction ports on at least one end portion side not used for a suction operation of a small-size object. Each of the air shutter devices is constituted by a passage block having an air passage through which air for sucking an object passes, a magnetic member arranged around an air passage opening portion of the passage block, and a shutter member consisting of a magnetic material and movable between a closed position where the air passage opening portion of the passage block including the magnetic member is closed and an open position where the air passage is open, one of the magnetic member and the shutter member being magnetized. The shutter member moves to the closed position to close the air passage opening portion of the passage block by an air suction force and a magnetic attraction force between the shutter member and the magnetic member when the suction operation of the small-size object is performed.

대표청구항 ▼

A paper suction apparatus for a printing press, comprising a plurality of suction ports, arranged in an axial direction and provided to a paper convey cylinder, for temporality sucking and holding a paper sheet transferred from an upstream cylinder, and air shutter devices provided to said suction p

A paper suction apparatus for a printing press, comprising a plurality of suction ports, arranged in an axial direction and provided to a paper convey cylinder, for temporality sucking and holding a paper sheet transferred from an upstream cylinder, and air shutter devices provided to said suction ports on two end sides not used for a suction operation of a small-size paper sheet, wherein each of said air shutter devices is constituted by a passage block having an air passage through which air for sucking a paper sheet passes, a magnetic member arranged around an opening of said air passage, and a shutter member consisting of a magnetic material and movable between a closed position where said opening of said air passage is closed and an open position where said opening of said air passage is open, one of said magnetic member and said shutter member being magnetized, and said shutter member moves to the closed position to close said opening of said air passage of said passage block by an air suction force and a magnetic attraction force between said shutter member and said magnetic member when the suction operation of said small-size object is performed, thereby preventing air leakage from said suction ports on the two end portion sides which are not used.