Abstract: A can inspection device includes a rotation device rotating cans, an imaging device taking images of rotating cans, and an image processor processing taken images. The imaging device includes a first camera taking an image of an entire can and a second camera taking an image of an opening-side end portion of the can. The image processor includes an image inspection means for inspecting whether printing is performed properly as compared with a master image by using the image taken by the first camera, a density measurement means for measuring densities in designated positions for respective colors by using the image taken by the first camera, and a printing misalignment value measurement means for measuring misalignment values with respect to set positions of printing misalignment inspection marks printed on the opening-side end portion of the can for respective colors by using the image taken by the second camera.

Abstract: A can inspection device includes a rotation device rotating cans, an imaging device taking images of rotating cans, and an image processor processing taken images. The imaging device includes a first camera taking an image of an entire can and a second camera taking an image of an opening-side end portion of the can. The image processor includes an image inspection means for inspecting whether printing is performed properly as compared with a master image by using the image taken by the first camera, a density measurement means for measuring densities in designated positions for respective colors by using the image taken by the first camera, and a printing misalignment value measurement means for measuring misalignment values with respect to set positions of printing misalignment inspection marks printed on the opening-side end portion of the can for respective colors by using the image taken by the second camera.

Abstract: An image processor 53 processing taken images includes an image inspection means 54 for inspecting whether printing is performed properly as compared with a master image by using the image of the entire can taken by a first camera, a density measurement means 55 for measuring densities in designated positions for respective colors also by using the image of the entire can taken by the first camera, and a printing misalignment value measurement means 56 for measuring misalignment values with respect to set positions of printing misalignment inspection marks printed on an opening-side end portion of a can for respective colors by using the image of the opening-side end portion of the can taken by the second camera.

Abstract: An image processor 53 processing taken images includes an image inspection means 54 for inspecting whether printing is performed properly as compared with a master image by using the image of the entire can taken by a first camera, a density measurement means 55 for measuring densities in designated positions for respective colors also by using the image of the entire can taken by the first camera, and a printing misalignment value measurement means 56 for measuring misalignment values with respect to set positions of printing misalignment inspection marks printed on an opening-side end portion of a can for respective colors by using the image of the opening-side end portion of the can taken by the second camera.

Abstract: The present invention eliminates backlash between a drive helical gear and a driven helical gear and facilitates rotation of a driven gear member to increase rotational accuracy of a plate cylinder. A plate cylinder drive unit includes a plate cylinder drive shaft, a driven gear member having a driven helical gear that meshes with a drive helical gear and attached around the plate cylinder drive shaft, a position adjustment member moving the driven gear member to fix it at a predetermined position, a whirl-stop member attached to the plate cylinder drive shaft, a sandwiching member removably fixing the whirl-stop member to the driven gear member, a backlash eliminating helical gear disposed on one side of the driven helical gear, first springs bringing the backlash eliminating helical gear in pressure-contact with the driven helical gear, and second springs biasing the backlash eliminating helical gear to rotate it in a predetermined direction.

Abstract: The present invention eliminates backlash between a drive helical gear and a driven helical gear and facilitates rotation of a driven gear member to increase rotational accuracy of a plate cylinder. A plate cylinder drive unit includes a plate cylinder drive shaft, a driven gear member having a driven helical gear that meshes with a drive helical gear and attached around the plate cylinder drive shaft, a position adjustment member moving the driven gear member to fix it at a predetermined position, a whirl-stop member attached to the plate cylinder drive shaft, a sandwiching member removably fixing the whirl-stop member to the driven gear member, a backlash eliminating helical gear disposed on one side of the driven helical gear, first springs bringing the backlash eliminating helical gear in pressure-contact with the driven helical gear, and second springs biasing the backlash eliminating helical gear to rotate it in a predetermined direction.