Abstract: A gas collection device of a printing press includes an organic compound treatment system (33) including a gas chamber (34). The device includes a cover (3) configured to cover a print unit (2) of a printing press. The device includes a gas transfer device (4) configured to suck a gas of a volatile organic compound produced in the print unit (2) from the inside of the cover 3 and transfer the gas to the gas chamber (34). It is possible to provide a gas collection device of a printing press, which can prevent a work environment in which the printing press is installed from being deteriorated by the gas of the volatile organic compound.

Abstract: A sheet abnormality detection apparatus includes a plurality of abutting members which move upon coming into contact with at least one of sheets conveyed to overlap while being shifted from each other in a convey direction and an object attached to a sheet. The plurality of abutting members are disposed side by side in a direction perpendicular to a sheet convey direction. The apparatus also includes an abnormality detection unit which detects a sheet abnormality on the basis of a relative positional shift among the plurality of abutting members. A sheet abnormality detection method is also disclosed.

Abstract: A sheet guide apparatus comprises gripper devices for holding and transporting a printed sheet, an impression cylinder and a transfer cylinder for holding and transporting the printed sheet received from the gripper device, and a first guide device for guiding the printed sheet being transported. A front end portion of the first guide device is located upstream, in the flow direction of the printed sheet, from a transfer position, where the printed sheet is transferred from the gripper device to the impression cylinder, and the front end portion of the first guide device is also located near the transfer position. Suction holes opening in a front end portion of a plate-shaped guide of the first guide device are provided for sucking air. The sheet guide apparatus suppresses fluttering or instability of the sheet.

Abstract: A sheet guide apparatus comprises gripper devices for holding and transporting a printed sheet, an impression cylinder and a transfer cylinder for holding and transporting the printed sheet received from the gripper device, and a first guide device for guiding the printed sheet being transported. A front end portion of the first guide device is located upstream, in the flow direction of the printed sheet, from a transfer position, where the printed sheet is transferred from the gripper device to the impression cylinder, and the front end portion of the first guide device is also located near the transfer position. Suction holes opening in a front end portion of a plate-shaped guide of the first guide device are provided for sucking air. The sheet guide apparatus suppresses fluttering or instability of the sheet.

Abstract: A printing switching apparatus for a sheet-fed rotary press with a reversing mechanism includes a fixed gear, a rotary gear, a fixing unit, and a proximity switch. The fixed gear is fixed to the shaft of a first cylinder. The rotary gear is coaxial with the fixed gear, coupled to be driven with a second adjacent cylinder along a paper convey direction, and phase-adjustable with respect to the fixed gear in a circumferential direction. The fixing unit fixes the rotary gear to one of the fixed gear and the shaft of the first cylinder to perform rotational transmission such that phase switching of the rotary gear between single-sided printing and perfecting printing is performed when the fixing means is released, and the rotary gear is not fixed to one of the fixed gear and the shaft of the first cylinder.

Abstract: A printing switching apparatus for a sheet-fed rotary press with a reversing mechanism includes a fixed gear, a rotary gear, a first inclined surface, an engaging member, and an actuating unit. The fixed gear is fixed to a shaft of a cylinder. The rotary gear is coaxial with the fixed gear, coupled to be driven with a cylinder adjacent to the cylinder, and phase-adjustable with respect to the fixed gear in a circumferential direction. The first inclined surface is formed on the rotary gear. The engaging member is movable with respect to the fixed gear and has a second inclined surface pressed against the first inclined surface of the rotary gear. The actuating unit moves the engaging means in a direction to be separated from or come close to the fixed gear, presses or releases the first inclined surface of the rotary gear and the second inclined surface of the engaging member against or from each other, and connects or disconnects rotational transmission between the fixed gear and the rotary gear.