Can printing apparatus and can inspection device
AssigneesI. Mer Co., Ltd., Nippon National Seikan Company, Ltd.
InventorMasayuki Izume
Life of this patent
Estimating the term…
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.
Claims6
A can printing apparatus comprising:
- a printer having plural plate cylinders for printing different colors and performing printing to cans;
- a can inspection device performing inspections of print states of the cans;
- and
- a controller changing printing conditions of the printer based on inspection results of the can inspection device,
- wherein the printer further comprises:
- an ink supply device provided with plural ink transfer rollers and an inkwell roller, the plural ink transfer rollers being divided in a length direction of the inkwell roller so as to be close to the inkwell roller and forming an inkwell, each ink transfer roller configured to be individually switched between a transfer position where the ink transfer roller contacts the inkwell roller and a non-transfer position where the ink transfer roller is separated from the inkwell roller;
- and
- a controller configured to control the ink supply device to transfer ink by switching the position of a required ink transfer roller at transfer timings of given intervals, and to control a rotation angle of the inkwell roller made from the contact of the inkwell roller until the separation from the inkwell roller in each ink transfer roller to thereby control a contact length between each ink transfer roller and the inkwell roller,
- wherein the can inspection device comprises a can rotation device rotating cans, a can imaging device taking images of cans, and an image processor processing taken images, the image processor comprising a density measurement means for measuring densities of images printed on cans for respective colors as well as for predetermined places corresponding to respective ink transfer rollers and outputting the densities to the controller of the ink supply devices, and
- wherein the controller configured to control the ink supply device adjusts the contact length between each ink transfer roller and the inkwell roller for each color based on respective density values outputted from the density measurement means of the can inspection device.
A can printing apparatus comprising:
- a printer having plural plate cylinders for printing different colors and performing printing to cans;
- a can inspection device performing inspections of print states of the cans;
- and
- a controller changing printing conditions of the printer based on inspection results of the can inspection device,
- wherein the can inspection device comprises a can rotation device rotating cans, a can imaging device taking images of cans, and an image processor processing taken images, the image processor comprising a printing misalignment value measurement means for measuring misalignment values with respect to set positions of printing misalignment inspection marks printed on a can, and the printer further comprises a registration device performing registration of the plate cylinder automatically based on the printing misalignment values measured by the can inspection device.
Dependencies are inferred from the claim text.