Cutting plotter equipped with device for reading register marks for seal cutting and method for reading register marks using same
US6201256A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 19, 1998 |
| Grant date | Mar 13, 2001 |
| Priority date | — |
| Expiry date | Jan 19, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05B2219/42222
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A cutting plotter equipped with a device for reading register marks for seal cutting capable of accurately reading the register marks printed on a seal material. The cutting plotter includes a head provided thereon with a light emitting element for emitting a predetermined amount of light toward a surface of the seal material and a light receiving element for detecting the amount of light reflected from the surface of the seal material. A difference between the amounts of reflected light detected by the light receiving element is calculated by a first calculation unit and then stored in a storage unit. A relative difference between the difference in the amounts of reflected light stored in the storage unit and a difference between the amounts of reflected light calculated by the first calculation unit is calculated by a second calculation unit. Also, a determination unit is arranged so as to determine whether or not the relative difference calculated by the second calculation unit is within a predetermined tolerance, to thereby determine whether or not the register marks are printed on the seal material.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.